diff options
| -rw-r--r-- | Documentation/devicetree/bindings/serial/axis,etraxfs-uart.txt | 22 | ||||
| -rw-r--r-- | drivers/tty/serial/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/tty/serial/Makefile | 2 | ||||
| -rw-r--r-- | drivers/tty/serial/crisv10.c | 4248 | ||||
| -rw-r--r-- | drivers/tty/serial/crisv10.h | 133 | ||||
| -rw-r--r-- | drivers/tty/serial/etraxfs-uart.c | 960 |
6 files changed, 0 insertions, 5376 deletions
diff --git a/Documentation/devicetree/bindings/serial/axis,etraxfs-uart.txt b/Documentation/devicetree/bindings/serial/axis,etraxfs-uart.txt deleted file mode 100644 index 048c3818c826..000000000000 --- a/Documentation/devicetree/bindings/serial/axis,etraxfs-uart.txt +++ /dev/null @@ -1,22 +0,0 @@ -ETRAX FS UART - -Required properties: -- compatible : "axis,etraxfs-uart" -- reg: offset and length of the register set for the device. -- interrupts: device interrupt - -Optional properties: -- {dtr,dsr,rng,dcd}-gpios: specify a GPIO for DTR/DSR/RI/DCD - line respectively. - -Example: - -serial@b00260000 { - compatible = "axis,etraxfs-uart"; - reg = <0xb0026000 0x1000>; - interrupts = <68>; - dtr-gpios = <&sysgpio 0 GPIO_ACTIVE_LOW>; - dsr-gpios = <&sysgpio 1 GPIO_ACTIVE_LOW>; - rng-gpios = <&sysgpio 2 GPIO_ACTIVE_LOW>; - dcd-gpios = <&sysgpio 3 GPIO_ACTIVE_LOW>; -}; diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 3682fd3e960c..f6e09326042d 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1114,17 +1114,6 @@ config SERIAL_VT8500_CONSOLE depends on SERIAL_VT8500=y select SERIAL_CORE_CONSOLE -config SERIAL_ETRAXFS - bool "ETRAX FS serial port support" - depends on ETRAX_ARCH_V32 && OF - select SERIAL_CORE - select SERIAL_MCTRL_GPIO if GPIOLIB - -config SERIAL_ETRAXFS_CONSOLE - bool "ETRAX FS serial console support" - depends on SERIAL_ETRAXFS - select SERIAL_CORE_CONSOLE - config SERIAL_NETX tristate "NetX serial port support" depends on ARCH_NETX diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 842d185d697e..c21835dc16b2 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -51,8 +51,6 @@ obj-$(CONFIG_SERIAL_M32R_SIO) += m32r_sio.o obj-$(CONFIG_SERIAL_MPSC) += mpsc.o obj-$(CONFIG_SERIAL_MESON) += meson_uart.o obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o -obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o -obj-$(CONFIG_SERIAL_ETRAXFS) += etraxfs-uart.o obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o obj-$(CONFIG_SERIAL_SC16IS7XX_CORE) += sc16is7xx.o obj-$(CONFIG_SERIAL_JSM) += jsm/ diff --git a/drivers/tty/serial/crisv10.c b/drivers/tty/serial/crisv10.c deleted file mode 100644 index c9458a033e3c..000000000000 --- a/drivers/tty/serial/crisv10.c +++ /dev/null @@ -1,4248 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Serial port driver for the ETRAX 100LX chip - * - * Copyright (C) 1998-2007 Axis Communications AB - * - * Many, many authors. Based once upon a time on serial.c for 16x50. - * - */ - -static char *serial_version = "$Revision: 1.25 $"; - -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/signal.h> -#include <linux/sched/signal.h> -#include <linux/timer.h> -#include <linux/interrupt.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/major.h> -#include <linux/string.h> -#include <linux/fcntl.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/mutex.h> -#include <linux/bitops.h> -#include <linux/seq_file.h> -#include <linux/delay.h> -#include <linux/uaccess.h> -#include <linux/io.h> - -#include <asm/irq.h> -#include <asm/dma.h> - -#include <arch/svinto.h> -#include <arch/system.h> - -/* non-arch dependent serial structures are in linux/serial.h */ -#include <linux/serial.h> -/* while we keep our own stuff (struct e100_serial) in a local .h file */ -#include "crisv10.h" -#include <asm/fasttimer.h> -#include <arch/io_interface_mux.h> - -#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER -#ifndef CONFIG_ETRAX_FAST_TIMER -#error "Enable FAST_TIMER to use SERIAL_FAST_TIMER" -#endif -#endif - -#if defined(CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS) && \ - (CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS == 0) -#error "RX_TIMEOUT_TICKS == 0 not allowed, use 1" -#endif - -/* - * All of the compatibilty code so we can compile serial.c against - * older kernels is hidden in serial_compat.h - */ -#if defined(LOCAL_HEADERS) -#include "serial_compat.h" -#endif - -struct tty_driver *serial_driver; - -/* number of characters left in xmit buffer before we ask for more */ -#define WAKEUP_CHARS 256 - -//#define SERIAL_DEBUG_INTR -//#define SERIAL_DEBUG_OPEN -//#define SERIAL_DEBUG_FLOW -//#define SERIAL_DEBUG_DATA -//#define SERIAL_DEBUG_THROTTLE -//#define SERIAL_DEBUG_IO /* Debug for Extra control and status pins */ -//#define SERIAL_DEBUG_LINE 0 /* What serport we want to debug */ - -/* Enable this to use serial interrupts to handle when you - expect the first received event on the serial port to - be an error, break or similar. Used to be able to flash IRMA - from eLinux */ -#define SERIAL_HANDLE_EARLY_ERRORS - -/* Currently 16 descriptors x 128 bytes = 2048 bytes */ -#define SERIAL_DESCR_BUF_SIZE 256 - -#define SERIAL_PRESCALE_BASE 3125000 /* 3.125MHz */ -#define DEF_BAUD_BASE SERIAL_PRESCALE_BASE - -/* We don't want to load the system with massive fast timer interrupt - * on high baudrates so limit it to 250 us (4kHz) */ -#define MIN_FLUSH_TIME_USEC 250 - -/* Add an x here to log a lot of timer stuff */ -#define TIMERD(x) -/* Debug details of interrupt handling */ -#define DINTR1(x) /* irq on/off, errors */ -#define DINTR2(x) /* tx and rx */ -/* Debug flip buffer stuff */ -#define DFLIP(x) -/* Debug flow control and overview of data flow */ -#define DFLOW(x) -#define DBAUD(x) -#define DLOG_INT_TRIG(x) - -//#define DEBUG_LOG_INCLUDED -#ifndef DEBUG_LOG_INCLUDED -#define DEBUG_LOG(line, string, value) -#else -struct debug_log_info -{ - unsigned long time; - unsigned long timer_data; -// int line; - const char *string; - int value; -}; -#define DEBUG_LOG_SIZE 4096 - -struct debug_log_info debug_log[DEBUG_LOG_SIZE]; -int debug_log_pos = 0; - -#define DEBUG_LOG(_line, _string, _value) do { \ - if ((_line) == SERIAL_DEBUG_LINE) {\ - debug_log_func(_line, _string, _value); \ - }\ -}while(0) - -void debug_log_func(int line, const char *string, int value) -{ - if (debug_log_pos < DEBUG_LOG_SIZE) { - debug_log[debug_log_pos].time = jiffies; - debug_log[debug_log_pos].timer_data = *R_TIMER_DATA; -// debug_log[debug_log_pos].line = line; - debug_log[debug_log_pos].string = string; - debug_log[debug_log_pos].value = value; - debug_log_pos++; - } - /*printk(string, value);*/ -} -#endif - -#ifndef CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS -/* Default number of timer ticks before flushing rx fifo - * When using "little data, low latency applications: use 0 - * When using "much data applications (PPP)" use ~5 - */ -#define CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS 5 -#endif - -unsigned long timer_data_to_ns(unsigned long timer_data); - -static void change_speed(struct e100_serial *info); -static void rs_throttle(struct tty_struct * tty); -static void rs_wait_until_sent(struct tty_struct *tty, int timeout); -static int rs_write(struct tty_struct *tty, - const unsigned char *buf, int count); -#ifdef CONFIG_ETRAX_RS485 -static int e100_write_rs485(struct tty_struct *tty, - const unsigned char *buf, int count); -#endif -static int get_lsr_info(struct e100_serial *info, unsigned int *value); - - -#define DEF_BAUD 115200 /* 115.2 kbit/s */ -#define DEF_RX 0x20 /* or SERIAL_CTRL_W >> 8 */ -/* Default value of tx_ctrl register: has txd(bit 7)=1 (idle) as default */ -#define DEF_TX 0x80 /* or SERIAL_CTRL_B */ - -/* offsets from R_SERIALx_CTRL */ - -#define REG_DATA 0 -#define REG_DATA_STATUS32 0 /* this is the 32 bit register R_SERIALx_READ */ -#define REG_TR_DATA 0 -#define REG_STATUS 1 -#define REG_TR_CTRL 1 -#define REG_REC_CTRL 2 -#define REG_BAUD 3 -#define REG_XOFF 4 /* this is a 32 bit register */ - -/* The bitfields are the same for all serial ports */ -#define SER_RXD_MASK IO_MASK(R_SERIAL0_STATUS, rxd) -#define SER_DATA_AVAIL_MASK IO_MASK(R_SERIAL0_STATUS, data_avail) -#define SER_FRAMING_ERR_MASK IO_MASK(R_SERIAL0_STATUS, framing_err) -#define SER_PAR_ERR_MASK IO_MASK(R_SERIAL0_STATUS, par_err) -#define SER_OVERRUN_MASK IO_MASK(R_SERIAL0_STATUS, overrun) - -#define SER_ERROR_MASK (SER_OVERRUN_MASK | SER_PAR_ERR_MASK | SER_FRAMING_ERR_MASK) - -/* Values for info->errorcode */ -#define ERRCODE_SET_BREAK (TTY_BREAK) -#define ERRCODE_INSERT 0x100 -#define ERRCODE_INSERT_BREAK (ERRCODE_INSERT | TTY_BREAK) - -#define FORCE_EOP(info) *R_SET_EOP = 1U << info->iseteop; - -/* - * General note regarding the use of IO_* macros in this file: - * - * We will use the bits defined for DMA channel 6 when using various - * IO_* macros (e.g. IO_STATE, IO_MASK, IO_EXTRACT) and _assume_ they are - * the same for all channels (which of course they are). - * - * We will also use the bits defined for serial port 0 when writing commands - * to the different ports, as these bits too are the same for all ports. - */ - - -/* Mask for the irqs possibly enabled in R_IRQ_MASK1_RD etc. */ -static const unsigned long e100_ser_int_mask = 0 -#ifdef CONFIG_ETRAX_SERIAL_PORT0 -| IO_MASK(R_IRQ_MASK1_RD, ser0_data) | IO_MASK(R_IRQ_MASK1_RD, ser0_ready) -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT1 -| IO_MASK(R_IRQ_MASK1_RD, ser1_data) | IO_MASK(R_IRQ_MASK1_RD, ser1_ready) -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT2 -| IO_MASK(R_IRQ_MASK1_RD, ser2_data) | IO_MASK(R_IRQ_MASK1_RD, ser2_ready) -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT3 -| IO_MASK(R_IRQ_MASK1_RD, ser3_data) | IO_MASK(R_IRQ_MASK1_RD, ser3_ready) -#endif -; -unsigned long r_alt_ser_baudrate_shadow = 0; - -/* this is the data for the four serial ports in the etrax100 */ -/* DMA2(ser2), DMA4(ser3), DMA6(ser0) or DMA8(ser1) */ -/* R_DMA_CHx_CLR_INTR, R_DMA_CHx_FIRST, R_DMA_CHx_CMD */ - -static struct e100_serial rs_table[] = { - { .baud = DEF_BAUD, - .ioport = (unsigned char *)R_SERIAL0_CTRL, - .irq = 1U << 12, /* uses DMA 6 and 7 */ - .oclrintradr = R_DMA_CH6_CLR_INTR, - .ofirstadr = R_DMA_CH6_FIRST, - .ocmdadr = R_DMA_CH6_CMD, - .ostatusadr = R_DMA_CH6_STATUS, - .iclrintradr = R_DMA_CH7_CLR_INTR, - .ifirstadr = R_DMA_CH7_FIRST, - .icmdadr = R_DMA_CH7_CMD, - .idescradr = R_DMA_CH7_DESCR, - .rx_ctrl = DEF_RX, - .tx_ctrl = DEF_TX, - .iseteop = 2, - .dma_owner = dma_ser0, - .io_if = if_serial_0, -#ifdef CONFIG_ETRAX_SERIAL_PORT0 - .enabled = 1, -#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA6_OUT - .dma_out_enabled = 1, - .dma_out_nbr = SER0_TX_DMA_NBR, - .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR, - .dma_out_irq_flags = 0, - .dma_out_irq_description = "serial 0 dma tr", -#else - .dma_out_enabled = 0, - .dma_out_nbr = UINT_MAX, - .dma_out_irq_nbr = 0, - .dma_out_irq_flags = 0, - .dma_out_irq_description = NULL, -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT0_DMA7_IN - .dma_in_enabled = 1, - .dma_in_nbr = SER0_RX_DMA_NBR, - .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR, - .dma_in_irq_flags = 0, - .dma_in_irq_description = "serial 0 dma rec", -#else - .dma_in_enabled = 0, - .dma_in_nbr = UINT_MAX, - .dma_in_irq_nbr = 0, - .dma_in_irq_flags = 0, - .dma_in_irq_description = NULL, -#endif -#else - .enabled = 0, - .io_if_description = NULL, - .dma_out_enabled = 0, - .dma_in_enabled = 0 -#endif - -}, /* ttyS0 */ - { .baud = DEF_BAUD, - .ioport = (unsigned char *)R_SERIAL1_CTRL, - .irq = 1U << 16, /* uses DMA 8 and 9 */ - .oclrintradr = R_DMA_CH8_CLR_INTR, - .ofirstadr = R_DMA_CH8_FIRST, - .ocmdadr = R_DMA_CH8_CMD, - .ostatusadr = R_DMA_CH8_STATUS, - .iclrintradr = R_DMA_CH9_CLR_INTR, - .ifirstadr = R_DMA_CH9_FIRST, - .icmdadr = R_DMA_CH9_CMD, - .idescradr = R_DMA_CH9_DESCR, - .rx_ctrl = DEF_RX, - .tx_ctrl = DEF_TX, - .iseteop = 3, - .dma_owner = dma_ser1, - .io_if = if_serial_1, -#ifdef CONFIG_ETRAX_SERIAL_PORT1 - .enabled = 1, - .io_if_description = "ser1", -#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA8_OUT - .dma_out_enabled = 1, - .dma_out_nbr = SER1_TX_DMA_NBR, - .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR, - .dma_out_irq_flags = 0, - .dma_out_irq_description = "serial 1 dma tr", -#else - .dma_out_enabled = 0, - .dma_out_nbr = UINT_MAX, - .dma_out_irq_nbr = 0, - .dma_out_irq_flags = 0, - .dma_out_irq_description = NULL, -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT1_DMA9_IN - .dma_in_enabled = 1, - .dma_in_nbr = SER1_RX_DMA_NBR, - .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR, - .dma_in_irq_flags = 0, - .dma_in_irq_description = "serial 1 dma rec", -#else - .dma_in_enabled = 0, - .dma_in_enabled = 0, - .dma_in_nbr = UINT_MAX, - .dma_in_irq_nbr = 0, - .dma_in_irq_flags = 0, - .dma_in_irq_description = NULL, -#endif -#else - .enabled = 0, - .io_if_description = NULL, - .dma_in_irq_nbr = 0, - .dma_out_enabled = 0, - .dma_in_enabled = 0 -#endif -}, /* ttyS1 */ - - { .baud = DEF_BAUD, - .ioport = (unsigned char *)R_SERIAL2_CTRL, - .irq = 1U << 4, /* uses DMA 2 and 3 */ - .oclrintradr = R_DMA_CH2_CLR_INTR, - .ofirstadr = R_DMA_CH2_FIRST, - .ocmdadr = R_DMA_CH2_CMD, - .ostatusadr = R_DMA_CH2_STATUS, - .iclrintradr = R_DMA_CH3_CLR_INTR, - .ifirstadr = R_DMA_CH3_FIRST, - .icmdadr = R_DMA_CH3_CMD, - .idescradr = R_DMA_CH3_DESCR, - .rx_ctrl = DEF_RX, - .tx_ctrl = DEF_TX, - .iseteop = 0, - .dma_owner = dma_ser2, - .io_if = if_serial_2, -#ifdef CONFIG_ETRAX_SERIAL_PORT2 - .enabled = 1, - .io_if_description = "ser2", -#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA2_OUT - .dma_out_enabled = 1, - .dma_out_nbr = SER2_TX_DMA_NBR, - .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR, - .dma_out_irq_flags = 0, - .dma_out_irq_description = "serial 2 dma tr", -#else - .dma_out_enabled = 0, - .dma_out_nbr = UINT_MAX, - .dma_out_irq_nbr = 0, - .dma_out_irq_flags = 0, - .dma_out_irq_description = NULL, -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT2_DMA3_IN - .dma_in_enabled = 1, - .dma_in_nbr = SER2_RX_DMA_NBR, - .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR, - .dma_in_irq_flags = 0, - .dma_in_irq_description = "serial 2 dma rec", -#else - .dma_in_enabled = 0, - .dma_in_nbr = UINT_MAX, - .dma_in_irq_nbr = 0, - .dma_in_irq_flags = 0, - .dma_in_irq_description = NULL, -#endif -#else - .enabled = 0, - .io_if_description = NULL, - .dma_out_enabled = 0, - .dma_in_enabled = 0 -#endif - }, /* ttyS2 */ - - { .baud = DEF_BAUD, - .ioport = (unsigned char *)R_SERIAL3_CTRL, - .irq = 1U << 8, /* uses DMA 4 and 5 */ - .oclrintradr = R_DMA_CH4_CLR_INTR, - .ofirstadr = R_DMA_CH4_FIRST, - .ocmdadr = R_DMA_CH4_CMD, - .ostatusadr = R_DMA_CH4_STATUS, - .iclrintradr = R_DMA_CH5_CLR_INTR, - .ifirstadr = R_DMA_CH5_FIRST, - .icmdadr = R_DMA_CH5_CMD, - .idescradr = R_DMA_CH5_DESCR, - .rx_ctrl = DEF_RX, - .tx_ctrl = DEF_TX, - .iseteop = 1, - .dma_owner = dma_ser3, - .io_if = if_serial_3, -#ifdef CONFIG_ETRAX_SERIAL_PORT3 - .enabled = 1, - .io_if_description = "ser3", -#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA4_OUT - .dma_out_enabled = 1, - .dma_out_nbr = SER3_TX_DMA_NBR, - .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR, - .dma_out_irq_flags = 0, - .dma_out_irq_description = "serial 3 dma tr", -#else - .dma_out_enabled = 0, - .dma_out_nbr = UINT_MAX, - .dma_out_irq_nbr = 0, - .dma_out_irq_flags = 0, - .dma_out_irq_description = NULL, -#endif -#ifdef CONFIG_ETRAX_SERIAL_PORT3_DMA5_IN - .dma_in_enabled = 1, - .dma_in_nbr = SER3_RX_DMA_NBR, - .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR, - .dma_in_irq_flags = 0, - .dma_in_irq_description = "serial 3 dma rec", -#else - .dma_in_enabled = 0, - .dma_in_nbr = UINT_MAX, - .dma_in_irq_nbr = 0, - .dma_in_irq_flags = 0, - .dma_in_irq_description = NULL -#endif -#else - .enabled = 0, - .io_if_description = NULL, - .dma_out_enabled = 0, - .dma_in_enabled = 0 -#endif - } /* ttyS3 */ -}; - - -#define NR_PORTS (sizeof(rs_table)/sizeof(struct e100_serial)) - -#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER -static struct fast_timer fast_timers[NR_PORTS]; -#endif - -/* RS-485 */ -#if defined(CONFIG_ETRAX_RS485) -#ifdef CONFIG_ETRAX_FAST_TIMER -static struct fast_timer fast_timers_rs485[NR_PORTS]; -#endif -#if defined(CONFIG_ETRAX_RS485_ON_PA) -static int rs485_pa_bit = CONFIG_ETRAX_RS485_ON_PA_BIT; -#endif -#endif - -/* Info and macros needed for each ports extra control/status signals. */ -#define E100_STRUCT_PORT(line, pinname) \ - ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ - (R_PORT_PA_DATA): ( \ - (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ - (R_PORT_PB_DATA):&dummy_ser[line])) - -#define E100_STRUCT_SHADOW(line, pinname) \ - ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ - (&port_pa_data_shadow): ( \ - (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ - (&port_pb_data_shadow):&dummy_ser[line])) -#define E100_STRUCT_MASK(line, pinname) \ - ((CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT >= 0)? \ - (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PA_BIT): ( \ - (CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT >= 0)? \ - (1<<CONFIG_ETRAX_SER##line##_##pinname##_ON_PB_BIT):DUMMY_##pinname##_MASK)) - -#define DUMMY_DTR_MASK 1 -#define DUMMY_RI_MASK 2 -#define DUMMY_DSR_MASK 4 -#define DUMMY_CD_MASK 8 -static unsigned char dummy_ser[NR_PORTS] = {0xFF, 0xFF, 0xFF,0xFF}; - -/* If not all status pins are used or disabled, use mixed mode */ -#ifdef CONFIG_ETRAX_SERIAL_PORT0 - -#define SER0_PA_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PA_BIT+CONFIG_ETRAX_SER0_RI_ON_PA_BIT+CONFIG_ETRAX_SER0_DSR_ON_PA_BIT+CONFIG_ETRAX_SER0_CD_ON_PA_BIT) - -#if SER0_PA_BITSUM != -4 -# if CONFIG_ETRAX_SER0_DTR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER0_RI_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER0_DSR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER0_CD_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#define SER0_PB_BITSUM (CONFIG_ETRAX_SER0_DTR_ON_PB_BIT+CONFIG_ETRAX_SER0_RI_ON_PB_BIT+CONFIG_ETRAX_SER0_DSR_ON_PB_BIT+CONFIG_ETRAX_SER0_CD_ON_PB_BIT) - -#if SER0_PB_BITSUM != -4 -# if CONFIG_ETRAX_SER0_DTR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER0_RI_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER0_DSR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER0_CD_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#endif /* PORT0 */ - - -#ifdef CONFIG_ETRAX_SERIAL_PORT1 - -#define SER1_PA_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PA_BIT+CONFIG_ETRAX_SER1_RI_ON_PA_BIT+CONFIG_ETRAX_SER1_DSR_ON_PA_BIT+CONFIG_ETRAX_SER1_CD_ON_PA_BIT) - -#if SER1_PA_BITSUM != -4 -# if CONFIG_ETRAX_SER1_DTR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER1_RI_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER1_DSR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER1_CD_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#define SER1_PB_BITSUM (CONFIG_ETRAX_SER1_DTR_ON_PB_BIT+CONFIG_ETRAX_SER1_RI_ON_PB_BIT+CONFIG_ETRAX_SER1_DSR_ON_PB_BIT+CONFIG_ETRAX_SER1_CD_ON_PB_BIT) - -#if SER1_PB_BITSUM != -4 -# if CONFIG_ETRAX_SER1_DTR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER1_RI_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER1_DSR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER1_CD_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#endif /* PORT1 */ - -#ifdef CONFIG_ETRAX_SERIAL_PORT2 - -#define SER2_PA_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PA_BIT+CONFIG_ETRAX_SER2_RI_ON_PA_BIT+CONFIG_ETRAX_SER2_DSR_ON_PA_BIT+CONFIG_ETRAX_SER2_CD_ON_PA_BIT) - -#if SER2_PA_BITSUM != -4 -# if CONFIG_ETRAX_SER2_DTR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER2_RI_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER2_DSR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER2_CD_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#define SER2_PB_BITSUM (CONFIG_ETRAX_SER2_DTR_ON_PB_BIT+CONFIG_ETRAX_SER2_RI_ON_PB_BIT+CONFIG_ETRAX_SER2_DSR_ON_PB_BIT+CONFIG_ETRAX_SER2_CD_ON_PB_BIT) - -#if SER2_PB_BITSUM != -4 -# if CONFIG_ETRAX_SER2_DTR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER2_RI_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER2_DSR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER2_CD_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#endif /* PORT2 */ - -#ifdef CONFIG_ETRAX_SERIAL_PORT3 - -#define SER3_PA_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PA_BIT+CONFIG_ETRAX_SER3_RI_ON_PA_BIT+CONFIG_ETRAX_SER3_DSR_ON_PA_BIT+CONFIG_ETRAX_SER3_CD_ON_PA_BIT) - -#if SER3_PA_BITSUM != -4 -# if CONFIG_ETRAX_SER3_DTR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER3_RI_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER3_DSR_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER3_CD_ON_PA_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#define SER3_PB_BITSUM (CONFIG_ETRAX_SER3_DTR_ON_PB_BIT+CONFIG_ETRAX_SER3_RI_ON_PB_BIT+CONFIG_ETRAX_SER3_DSR_ON_PB_BIT+CONFIG_ETRAX_SER3_CD_ON_PB_BIT) - -#if SER3_PB_BITSUM != -4 -# if CONFIG_ETRAX_SER3_DTR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER3_RI_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER3_DSR_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -# if CONFIG_ETRAX_SER3_CD_ON_PB_BIT == -1 -# ifndef CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED -# define CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED 1 -# endif -# endif -#endif - -#endif /* PORT3 */ - - -#if defined(CONFIG_ETRAX_SER0_DTR_RI_DSR_CD_MIXED) || \ - defined(CONFIG_ETRAX_SER1_DTR_RI_DSR_CD_MIXED) || \ - defined(CONFIG_ETRAX_SER2_DTR_RI_DSR_CD_MIXED) || \ - defined(CONFIG_ETRAX_SER3_DTR_RI_DSR_CD_MIXED) -#define ETRAX_SERX_DTR_RI_DSR_CD_MIXED -#endif - -#ifdef ETRAX_SERX_DTR_RI_DSR_CD_MIXED -/* The pins can be mixed on PA and PB */ -#define CONTROL_PINS_PORT_NOT_USED(line) \ - &dummy_ser[line], &dummy_ser[line], \ - &dummy_ser[line], &dummy_ser[line], \ - &dummy_ser[line], &dummy_ser[line], \ - &dummy_ser[line], &dummy_ser[line], \ - DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK - - -struct control_pins -{ - volatile unsigned char *dtr_port; - unsigned char *dtr_shadow; - volatile unsigned char *ri_port; - unsigned char *ri_shadow; - volatile unsigned char *dsr_port; - unsigned char *dsr_shadow; - volatile unsigned char *cd_port; - unsigned char *cd_shadow; - - unsigned char dtr_mask; - unsigned char ri_mask; - unsigned char dsr_mask; - unsigned char cd_mask; -}; - -static const struct control_pins e100_modem_pins[NR_PORTS] = -{ - /* Ser 0 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT0 - E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), - E100_STRUCT_PORT(0,RI), E100_STRUCT_SHADOW(0,RI), - E100_STRUCT_PORT(0,DSR), E100_STRUCT_SHADOW(0,DSR), - E100_STRUCT_PORT(0,CD), E100_STRUCT_SHADOW(0,CD), - E100_STRUCT_MASK(0,DTR), - E100_STRUCT_MASK(0,RI), - E100_STRUCT_MASK(0,DSR), - E100_STRUCT_MASK(0,CD) -#else - CONTROL_PINS_PORT_NOT_USED(0) -#endif - }, - - /* Ser 1 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT1 - E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), - E100_STRUCT_PORT(1,RI), E100_STRUCT_SHADOW(1,RI), - E100_STRUCT_PORT(1,DSR), E100_STRUCT_SHADOW(1,DSR), - E100_STRUCT_PORT(1,CD), E100_STRUCT_SHADOW(1,CD), - E100_STRUCT_MASK(1,DTR), - E100_STRUCT_MASK(1,RI), - E100_STRUCT_MASK(1,DSR), - E100_STRUCT_MASK(1,CD) -#else - CONTROL_PINS_PORT_NOT_USED(1) -#endif - }, - - /* Ser 2 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT2 - E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), - E100_STRUCT_PORT(2,RI), E100_STRUCT_SHADOW(2,RI), - E100_STRUCT_PORT(2,DSR), E100_STRUCT_SHADOW(2,DSR), - E100_STRUCT_PORT(2,CD), E100_STRUCT_SHADOW(2,CD), - E100_STRUCT_MASK(2,DTR), - E100_STRUCT_MASK(2,RI), - E100_STRUCT_MASK(2,DSR), - E100_STRUCT_MASK(2,CD) -#else - CONTROL_PINS_PORT_NOT_USED(2) -#endif - }, - - /* Ser 3 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT3 - E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), - E100_STRUCT_PORT(3,RI), E100_STRUCT_SHADOW(3,RI), - E100_STRUCT_PORT(3,DSR), E100_STRUCT_SHADOW(3,DSR), - E100_STRUCT_PORT(3,CD), E100_STRUCT_SHADOW(3,CD), - E100_STRUCT_MASK(3,DTR), - E100_STRUCT_MASK(3,RI), - E100_STRUCT_MASK(3,DSR), - E100_STRUCT_MASK(3,CD) -#else - CONTROL_PINS_PORT_NOT_USED(3) -#endif - } -}; -#else /* ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ - -/* All pins are on either PA or PB for each serial port */ -#define CONTROL_PINS_PORT_NOT_USED(line) \ - &dummy_ser[line], &dummy_ser[line], \ - DUMMY_DTR_MASK, DUMMY_RI_MASK, DUMMY_DSR_MASK, DUMMY_CD_MASK - - -struct control_pins -{ - volatile unsigned char *port; - unsigned char *shadow; - - unsigned char dtr_mask; - unsigned char ri_mask; - unsigned char dsr_mask; - unsigned char cd_mask; -}; - -#define dtr_port port -#define dtr_shadow shadow -#define ri_port port -#define ri_shadow shadow -#define dsr_port port -#define dsr_shadow shadow -#define cd_port port -#define cd_shadow shadow - -static const struct control_pins e100_modem_pins[NR_PORTS] = -{ - /* Ser 0 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT0 - E100_STRUCT_PORT(0,DTR), E100_STRUCT_SHADOW(0,DTR), - E100_STRUCT_MASK(0,DTR), - E100_STRUCT_MASK(0,RI), - E100_STRUCT_MASK(0,DSR), - E100_STRUCT_MASK(0,CD) -#else - CONTROL_PINS_PORT_NOT_USED(0) -#endif - }, - - /* Ser 1 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT1 - E100_STRUCT_PORT(1,DTR), E100_STRUCT_SHADOW(1,DTR), - E100_STRUCT_MASK(1,DTR), - E100_STRUCT_MASK(1,RI), - E100_STRUCT_MASK(1,DSR), - E100_STRUCT_MASK(1,CD) -#else - CONTROL_PINS_PORT_NOT_USED(1) -#endif - }, - - /* Ser 2 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT2 - E100_STRUCT_PORT(2,DTR), E100_STRUCT_SHADOW(2,DTR), - E100_STRUCT_MASK(2,DTR), - E100_STRUCT_MASK(2,RI), - E100_STRUCT_MASK(2,DSR), - E100_STRUCT_MASK(2,CD) -#else - CONTROL_PINS_PORT_NOT_USED(2) -#endif - }, - - /* Ser 3 */ - { -#ifdef CONFIG_ETRAX_SERIAL_PORT3 - E100_STRUCT_PORT(3,DTR), E100_STRUCT_SHADOW(3,DTR), - E100_STRUCT_MASK(3,DTR), - E100_STRUCT_MASK(3,RI), - E100_STRUCT_MASK(3,DSR), - E100_STRUCT_MASK(3,CD) -#else - CONTROL_PINS_PORT_NOT_USED(3) -#endif - } -}; -#endif /* !ETRAX_SERX_DTR_RI_DSR_CD_MIXED */ - -#define E100_RTS_MASK 0x20 -#define E100_CTS_MASK 0x40 - -/* All serial port signals are active low: - * active = 0 -> 3.3V to RS-232 driver -> -12V on RS-232 level - * inactive = 1 -> 0V to RS-232 driver -> +12V on RS-232 level - * - * These macros returns the pin value: 0=0V, >=1 = 3.3V on ETRAX chip - */ - -/* Output */ -#define E100_RTS_GET(info) ((info)->rx_ctrl & E100_RTS_MASK) -/* Input */ -#define E100_CTS_GET(info) ((info)->ioport[REG_STATUS] & E100_CTS_MASK) - -/* These are typically PA or PB and 0 means 0V, 1 means 3.3V */ -/* Is an output */ -#define E100_DTR_GET(info) ((*e100_modem_pins[(info)->line].dtr_shadow) & e100_modem_pins[(info)->line].dtr_mask) - -/* Normally inputs */ -#define E100_RI_GET(info) ((*e100_modem_pins[(info)->line].ri_port) & e100_modem_pins[(info)->line].ri_mask) -#define E100_CD_GET(info) ((*e100_modem_pins[(info)->line].cd_port) & e100_modem_pins[(info)->line].cd_mask) - -/* Input */ -#define E100_DSR_GET(info) ((*e100_modem_pins[(info)->line].dsr_port) & e100_modem_pins[(info)->line].dsr_mask) - -/* Calculate the chartime depending on baudrate, numbor of bits etc. */ -static void update_char_time(struct e100_serial * info) -{ - tcflag_t cflags = info->port.tty->termios.c_cflag; - int bits; - - /* calc. number of bits / data byte */ - /* databits + startbit and 1 stopbit */ - if ((cflags & CSIZE) == CS7) - bits = 9; - else - bits = 10; - - if (cflags & CSTOPB) /* 2 stopbits ? */ - bits++; - - if (cflags & PARENB) /* parity bit ? */ - bits++; - - /* calc timeout */ - info->char_time_usec = ((bits * 1000000) / info->baud) + 1; - info->flush_time_usec = 4*info->char_time_usec; - if (info->flush_time_usec < MIN_FLUSH_TIME_USEC) - info->flush_time_usec = MIN_FLUSH_TIME_USEC; - -} - -/* - * This function maps from the Bxxxx defines in asm/termbits.h into real - * baud rates. - */ - -static int -cflag_to_baud(unsigned int cflag) -{ - static int baud_table[] = { - 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, - 4800, 9600, 19200, 38400 }; - - static int ext_baud_table[] = { - 0, 57600, 115200, 230400, 460800, 921600, 1843200, 6250000, - 0, 0, 0, 0, 0, 0, 0, 0 }; - - if (cflag & CBAUDEX) - return ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; - else - return baud_table[cflag & CBAUD]; -} - -/* and this maps to an etrax100 hardware baud constant */ - -static unsigned char -cflag_to_etrax_baud(unsigned int cflag) -{ - char retval; - - static char baud_table[] = { - -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, -1, 3, 4, 5, 6, 7 }; - - static char ext_baud_table[] = { - -1, 8, 9, 10, 11, 12, 13, 14, -1, -1, -1, -1, -1, -1, -1, -1 }; - - if (cflag & CBAUDEX) - retval = ext_baud_table[(cflag & CBAUD) & ~CBAUDEX]; - else - retval = baud_table[cflag & CBAUD]; - - if (retval < 0) { - printk(KERN_WARNING "serdriver tried setting invalid baud rate, flags %x.\n", cflag); - retval = 5; /* choose default 9600 instead */ - } - - return retval | (retval << 4); /* choose same for both TX and RX */ -} - - -/* Various static support functions */ - -/* Functions to set or clear DTR/RTS on the requested line */ -/* It is complicated by the fact that RTS is a serial port register, while - * DTR might not be implemented in the HW at all, and if it is, it can be on - * any general port. - */ - - -static inline void -e100_dtr(struct e100_serial *info, int set) -{ - unsigned char mask = e100_modem_pins[info->line].dtr_mask; - -#ifdef SERIAL_DEBUG_IO - printk("ser%i dtr %i mask: 0x%02X\n", info->line, set, mask); - printk("ser%i shadow before 0x%02X get: %i\n", - info->line, *e100_modem_pins[info->line].dtr_shadow, - E100_DTR_GET(info)); -#endif - /* DTR is active low */ - { - unsigned long flags; - - local_irq_save(flags); - *e100_modem_pins[info->line].dtr_shadow &= ~mask; - *e100_modem_pins[info->line].dtr_shadow |= (set ? 0 : mask); - *e100_modem_pins[info->line].dtr_port = *e100_modem_pins[info->line].dtr_shadow; - local_irq_restore(flags); - } - -#ifdef SERIAL_DEBUG_IO - printk("ser%i shadow after 0x%02X get: %i\n", - info->line, *e100_modem_pins[info->line].dtr_shadow, - E100_DTR_GET(info)); -#endif -} - -/* set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive - * 0=0V , 1=3.3V - */ -static inline void -e100_rts(struct e100_serial *info, int set) -{ - unsigned long flags; - local_irq_save(flags); - info->rx_ctrl &= ~E100_RTS_MASK; - info->rx_ctrl |= (set ? 0 : E100_RTS_MASK); /* RTS is active low */ - info->ioport[REG_REC_CTRL] = info->rx_ctrl; - local_irq_restore(flags); -#ifdef SERIAL_DEBUG_IO - printk("ser%i rts %i\n", info->line, set); -#endif -} - - -/* If this behaves as a modem, RI and CD is an output */ -static inline void -e100_ri_out(struct e100_serial *info, int set) -{ - /* RI is active low */ - { - unsigned char mask = e100_modem_pins[info->line].ri_mask; - unsigned long flags; - - local_irq_save(flags); - *e100_modem_pins[info->line].ri_shadow &= ~mask; - *e100_modem_pins[info->line].ri_shadow |= (set ? 0 : mask); - *e100_modem_pins[info->line].ri_port = *e100_modem_pins[info->line].ri_shadow; - local_irq_restore(flags); - } -} -static inline void -e100_cd_out(struct e100_serial *info, int set) -{ - /* CD is active low */ - { - unsigned char mask = e100_modem_pins[info->line].cd_mask; - unsigned long flags; - - local_irq_save(flags); - *e100_modem_pins[info->line].cd_shadow &= ~mask; - *e100_modem_pins[info->line].cd_shadow |= (set ? 0 : mask); - *e100_modem_pins[info->line].cd_port = *e100_modem_pins[info->line].cd_shadow; - local_irq_restore(flags); - } -} - -static inline void -e100_disable_rx(struct e100_serial *info) -{ - /* disable the receiver */ - info->ioport[REG_REC_CTRL] = - (info->rx_ctrl &= ~IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); -} - -static inline void -e100_enable_rx(struct e100_serial *info) -{ - /* enable the receiver */ - info->ioport[REG_REC_CTRL] = - (info->rx_ctrl |= IO_MASK(R_SERIAL0_REC_CTRL, rec_enable)); -} - -/* the rx DMA uses both the dma_descr and the dma_eop interrupts */ - -static inline void -e100_disable_rxdma_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("rxdma_irq(%d): 0\n",info->line); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ disable_rxdma_irq %i\n", info->line)); - *R_IRQ_MASK2_CLR = (info->irq << 2) | (info->irq << 3); -} - -static inline void -e100_enable_rxdma_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("rxdma_irq(%d): 1\n",info->line); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ enable_rxdma_irq %i\n", info->line)); - *R_IRQ_MASK2_SET = (info->irq << 2) | (info->irq << 3); -} - -/* the tx DMA uses only dma_descr interrupt */ - -static void e100_disable_txdma_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("txdma_irq(%d): 0\n",info->line); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ disable_txdma_irq %i\n", info->line)); - *R_IRQ_MASK2_CLR = info->irq; -} - -static void e100_enable_txdma_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("txdma_irq(%d): 1\n",info->line); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ enable_txdma_irq %i\n", info->line)); - *R_IRQ_MASK2_SET = info->irq; -} - -static void e100_disable_txdma_channel(struct e100_serial *info) -{ - unsigned long flags; - - /* Disable output DMA channel for the serial port in question - * ( set to something other than serialX) - */ - local_irq_save(flags); - DFLOW(DEBUG_LOG(info->line, "disable_txdma_channel %i\n", info->line)); - if (info->line == 0) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma6)) == - IO_STATE(R_GEN_CONFIG, dma6, serial0)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused); - } - } else if (info->line == 1) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma8)) == - IO_STATE(R_GEN_CONFIG, dma8, serial1)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb); - } - } else if (info->line == 2) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma2)) == - IO_STATE(R_GEN_CONFIG, dma2, serial2)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0); - } - } else if (info->line == 3) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma4)) == - IO_STATE(R_GEN_CONFIG, dma4, serial3)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1); - } - } - *R_GEN_CONFIG = genconfig_shadow; - local_irq_restore(flags); -} - - -static void e100_enable_txdma_channel(struct e100_serial *info) -{ - unsigned long flags; - - local_irq_save(flags); - DFLOW(DEBUG_LOG(info->line, "enable_txdma_channel %i\n", info->line)); - /* Enable output DMA channel for the serial port in question */ - if (info->line == 0) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, serial0); - } else if (info->line == 1) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, serial1); - } else if (info->line == 2) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, serial2); - } else if (info->line == 3) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, serial3); - } - *R_GEN_CONFIG = genconfig_shadow; - local_irq_restore(flags); -} - -static void e100_disable_rxdma_channel(struct e100_serial *info) -{ - unsigned long flags; - - /* Disable input DMA channel for the serial port in question - * ( set to something other than serialX) - */ - local_irq_save(flags); - if (info->line == 0) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma7)) == - IO_STATE(R_GEN_CONFIG, dma7, serial0)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, unused); - } - } else if (info->line == 1) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma9)) == - IO_STATE(R_GEN_CONFIG, dma9, serial1)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, usb); - } - } else if (info->line == 2) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma3)) == - IO_STATE(R_GEN_CONFIG, dma3, serial2)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0); - } - } else if (info->line == 3) { - if ((genconfig_shadow & IO_MASK(R_GEN_CONFIG, dma5)) == - IO_STATE(R_GEN_CONFIG, dma5, serial3)) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1); - } - } - *R_GEN_CONFIG = genconfig_shadow; - local_irq_restore(flags); -} - - -static void e100_enable_rxdma_channel(struct e100_serial *info) -{ - unsigned long flags; - - local_irq_save(flags); - /* Enable input DMA channel for the serial port in question */ - if (info->line == 0) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma7); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma7, serial0); - } else if (info->line == 1) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma9); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma9, serial1); - } else if (info->line == 2) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, serial2); - } else if (info->line == 3) { - genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5); - genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, serial3); - } - *R_GEN_CONFIG = genconfig_shadow; - local_irq_restore(flags); -} - -#ifdef SERIAL_HANDLE_EARLY_ERRORS -/* in order to detect and fix errors on the first byte - we have to use the serial interrupts as well. */ - -static inline void -e100_disable_serial_data_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("ser_irq(%d): 0\n",info->line); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ disable data_irq %i\n", info->line)); - *R_IRQ_MASK1_CLR = (1U << (8+2*info->line)); -} - -static inline void -e100_enable_serial_data_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("ser_irq(%d): 1\n",info->line); - printk("**** %d = %d\n", - (8+2*info->line), - (1U << (8+2*info->line))); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ enable data_irq %i\n", info->line)); - *R_IRQ_MASK1_SET = (1U << (8+2*info->line)); -} -#endif - -static inline void -e100_disable_serial_tx_ready_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("ser_tx_irq(%d): 0\n",info->line); -#endif - DINTR1(DEBUG_LOG(info->line,"IRQ disable ready_irq %i\n", info->line)); - *R_IRQ_MASK1_CLR = (1U << (8+1+2*info->line)); -} - -static inline void -e100_enable_serial_tx_ready_irq(struct e100_serial *info) -{ -#ifdef SERIAL_DEBUG_INTR - printk("ser_tx_irq(%d): 1\n",info->line); - printk("**** %d = %d\n", - (8+1+2*info->line), - (1U << (8+1+2*info->line))); -#endif - DINTR2(DEBUG_LOG(info->line,"IRQ enable ready_irq %i\n", info->line)); - *R_IRQ_MASK1_SET = (1U << (8+1+2*info->line)); -} - -static inline void e100_enable_rx_irq(struct e100_serial *info) -{ - if (info->uses_dma_in) - e100_enable_rxdma_irq(info); - else - e100_enable_serial_data_irq(info); -} -static inline void e100_disable_rx_irq(struct e100_serial *info) -{ - if (info->uses_dma_in) - e100_disable_rxdma_irq(info); - else - e100_disable_serial_data_irq(info); -} - -#if defined(CONFIG_ETRAX_RS485) -/* Enable RS-485 mode on selected port. This is UGLY. */ -static int -e100_enable_rs485(struct tty_struct *tty, struct serial_rs485 *r) -{ - struct e100_serial * info = (struct e100_serial *)tty->driver_data; - -#if defined(CONFIG_ETRAX_RS485_ON_PA) - *R_PORT_PA_DATA = port_pa_data_shadow |= (1 << rs485_pa_bit); -#endif - - info->rs485 = *r; - - /* Maximum delay before RTS equal to 1000 */ - if (info->rs485.delay_rts_before_send >= 1000) - info->rs485.delay_rts_before_send = 1000; - -/* printk("rts: on send = %i, after = %i, enabled = %i", - info->rs485.rts_on_send, - info->rs485.rts_after_sent, - info->rs485.enabled - ); -*/ - return 0; -} - -static int -e100_write_rs485(struct tty_struct *tty, - const unsigned char *buf, int count) -{ - struct e100_serial * info = (struct e100_serial *)tty->driver_data; - int old_value = (info->rs485.flags) & SER_RS485_ENABLED; - - /* rs485 is always implicitly enabled if we're using the ioctl() - * but it doesn't have to be set in the serial_rs485 - * (to be backward compatible with old apps) - * So we store, set and restore it. - */ - info->rs485.flags |= SER_RS485_ENABLED; - /* rs_write now deals with RS485 if enabled */ - count = rs_write(tty, buf, count); - if (!old_value) - info->rs485.flags &= ~(SER_RS485_ENABLED); - return count; -} - -#ifdef CONFIG_ETRAX_FAST_TIMER -/* Timer function to toggle RTS when using FAST_TIMER */ -static void rs485_toggle_rts_timer_function(unsigned long data) -{ - struct e100_serial *info = (struct e100_serial *)data; - - fast_timers_rs485[info->line].function = NULL; - e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND)); -#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) - e100_enable_rx(info); - e100_enable_rx_irq(info); -#endif -} -#endif -#endif /* CONFIG_ETRAX_RS485 */ - -/* - * ------------------------------------------------------------ - * rs_stop() and rs_start() - * - * This routines are called before setting or resetting tty->stopped. - * They enable or disable transmitter using the XOFF registers, as necessary. - * ------------------------------------------------------------ - */ - -static void -rs_stop(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - if (info) { - unsigned long flags; - unsigned long xoff; - - local_irq_save(flags); - DFLOW(DEBUG_LOG(info->line, "XOFF rs_stop xmit %i\n", - CIRC_CNT(info->xmit.head, - info->xmit.tail,SERIAL_XMIT_SIZE))); - - xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, - STOP_CHAR(info->port.tty)); - xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, stop); - if (I_IXON(tty)) - xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); - - *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; - local_irq_restore(flags); - } -} - -static void -rs_start(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - if (info) { - unsigned long flags; - unsigned long xoff; - - local_irq_save(flags); - DFLOW(DEBUG_LOG(info->line, "XOFF rs_start xmit %i\n", - CIRC_CNT(info->xmit.head, - info->xmit.tail,SERIAL_XMIT_SIZE))); - xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(tty)); - xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); - if (I_IXON(tty)) - xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); - - *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; - if (!info->uses_dma_out && - info->xmit.head != info->xmit.tail && info->xmit.buf) - e100_enable_serial_tx_ready_irq(info); - - local_irq_restore(flags); - } -} - -/* - * ---------------------------------------------------------------------- - * - * Here starts the interrupt handling routines. All of the following - * subroutines are declared as inline and are folded into - * rs_interrupt(). They were separated out for readability's sake. - * - * Note: rs_interrupt() is a "fast" interrupt, which means that it - * runs with interrupts turned off. People who may want to modify - * rs_interrupt() should try to keep the interrupt handler as fast as - * possible. After you are done making modifications, it is not a bad - * idea to do: - * - * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c - * - * and look at the resulting assemble code in serial.s. - * - * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 - * ----------------------------------------------------------------------- - */ - -/* - * This routine is used by the interrupt handler to schedule - * processing in the software interrupt portion of the driver. - */ -static void rs_sched_event(struct e100_serial *info, int event) -{ - if (info->event & (1 << event)) - return; - info->event |= 1 << event; - schedule_work(&info->work); -} - -/* The output DMA channel is free - use it to send as many chars as possible - * NOTES: - * We don't pay attention to info->x_char, which means if the TTY wants to - * use XON/XOFF it will set info->x_char but we won't send any X char! - * - * To implement this, we'd just start a DMA send of 1 byte pointing at a - * buffer containing the X char, and skip updating xmit. We'd also have to - * check if the last sent char was the X char when we enter this function - * the next time, to avoid updating xmit with the sent X value. - */ - -static void -transmit_chars_dma(struct e100_serial *info) -{ - unsigned int c, sentl; - struct etrax_dma_descr *descr; - - /* acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ - *info->oclrintradr = - IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | - IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); - -#ifdef SERIAL_DEBUG_INTR - if (info->line == SERIAL_DEBUG_LINE) - printk("tc\n"); -#endif - if (!info->tr_running) { - /* weirdo... we shouldn't get here! */ - printk(KERN_WARNING "Achtung: transmit_chars_dma with !tr_running\n"); - return; - } - - descr = &info->tr_descr; - - /* first get the amount of bytes sent during the last DMA transfer, - and update xmit accordingly */ - - /* if the stop bit was not set, all data has been sent */ - if (!(descr->status & d_stop)) { - sentl = descr->sw_len; - } else - /* otherwise we find the amount of data sent here */ - sentl = descr->hw_len; - - DFLOW(DEBUG_LOG(info->line, "TX %i done\n", sentl)); - - /* update stats */ - info->icount.tx += sentl; - - /* update xmit buffer */ - info->xmit.tail = (info->xmit.tail + sentl) & (SERIAL_XMIT_SIZE - 1); - - /* if there is only a few chars left in the buf, wake up the blocked - write if any */ - if (CIRC_CNT(info->xmit.head, - info->xmit.tail, - SERIAL_XMIT_SIZE) < WAKEUP_CHARS) - rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); - - /* find out the largest amount of consecutive bytes we want to send now */ - - c = CIRC_CNT_TO_END(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); - - /* Don't send all in one DMA transfer - divide it so we wake up - * application before all is sent - */ - - if (c >= 4*WAKEUP_CHARS) - c = c/2; - - if (c <= 0) { - /* our job here is done, don't schedule any new DMA transfer */ - info->tr_running = 0; - -#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) - if (info->rs485.flags & SER_RS485_ENABLED) { - /* Set a short timer to toggle RTS */ - start_one_shot_timer(&fast_timers_rs485[info->line], - rs485_toggle_rts_timer_function, - (unsigned long)info, - info->char_time_usec*2, - "RS-485"); - } -#endif /* RS485 */ - return; - } - - /* ok we can schedule a dma send of c chars starting at info->xmit.tail */ - /* set up the descriptor correctly for output */ - DFLOW(DEBUG_LOG(info->line, "TX %i\n", c)); - descr->ctrl = d_int | d_eol | d_wait; /* Wait needed for tty_wait_until_sent() */ - descr->sw_len = c; - descr->buf = virt_to_phys(info->xmit.buf + info->xmit.tail); - descr->status = 0; - - *info->ofirstadr = virt_to_phys(descr); /* write to R_DMAx_FIRST */ - *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); - - /* DMA is now running (hopefully) */ -} /* transmit_chars_dma */ - -static void -start_transmit(struct e100_serial *info) -{ -#if 0 - if (info->line == SERIAL_DEBUG_LINE) - printk("x\n"); -#endif - - info->tr_descr.sw_len = 0; - info->tr_descr.hw_len = 0; - info->tr_descr.status = 0; - info->tr_running = 1; - if (info->uses_dma_out) - transmit_chars_dma(info); - else - e100_enable_serial_tx_ready_irq(info); -} /* start_transmit */ - -#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER -static int serial_fast_timer_started = 0; -static int serial_fast_timer_expired = 0; -static void flush_timeout_function(unsigned long data); -#define START_FLUSH_FAST_TIMER_TIME(info, string, usec) {\ - unsigned long timer_flags; \ - local_irq_save(timer_flags); \ - if (fast_timers[info->line].function == NULL) { \ - serial_fast_timer_started++; \ - TIMERD(DEBUG_LOG(info->line, "start_timer %i ", info->line)); \ - TIMERD(DEBUG_LOG(info->line, "num started: %i\n", serial_fast_timer_started)); \ - start_one_shot_timer(&fast_timers[info->line], \ - flush_timeout_function, \ - (unsigned long)info, \ - (usec), \ - string); \ - } \ - else { \ - TIMERD(DEBUG_LOG(info->line, "timer %i already running\n", info->line)); \ - } \ - local_irq_restore(timer_flags); \ -} -#define START_FLUSH_FAST_TIMER(info, string) START_FLUSH_FAST_TIMER_TIME(info, string, info->flush_time_usec) - -#else -#define START_FLUSH_FAST_TIMER_TIME(info, string, usec) -#define START_FLUSH_FAST_TIMER(info, string) -#endif - -static struct etrax_recv_buffer * -alloc_recv_buffer(unsigned int size) -{ - struct etrax_recv_buffer *buffer; - - buffer = kmalloc(sizeof *buffer + size, GFP_ATOMIC); - if (!buffer) - return NULL; - - buffer->next = NULL; - buffer->length = 0; - buffer->error = TTY_NORMAL; - - return buffer; -} - -static void -append_recv_buffer(struct e100_serial *info, struct etrax_recv_buffer *buffer) -{ - unsigned long flags; - - local_irq_save(flags); - - if (!info->first_recv_buffer) - info->first_recv_buffer = buffer; - else - info->last_recv_buffer->next = buffer; - - info->last_recv_buffer = buffer; - - info->recv_cnt += buffer->length; - if (info->recv_cnt > info->max_recv_cnt) - info->max_recv_cnt = info->recv_cnt; - - local_irq_restore(flags); -} - -static int -add_char_and_flag(struct e100_serial *info, unsigned char data, unsigned char flag) -{ - struct etrax_recv_buffer *buffer; - if (info->uses_dma_in) { - buffer = alloc_recv_buffer(4); - if (!buffer) - return 0; - - buffer->length = 1; - buffer->error = flag; - buffer->buffer[0] = data; - - append_recv_buffer(info, buffer); - - info->icount.rx++; - } else { - tty_insert_flip_char(&info->port, data, flag); - info->icount.rx++; - } - - return 1; -} - -static unsigned int handle_descr_data(struct e100_serial *info, - struct etrax_dma_descr *descr, - unsigned int recvl) -{ - struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer; - - if (info->recv_cnt + recvl > 65536) { - printk(KERN_WARNING - "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl); - return 0; - } - - buffer->length = recvl; - - if (info->errorcode == ERRCODE_SET_BREAK) - buffer->error = TTY_BREAK; - info->errorcode = 0; - - append_recv_buffer(info, buffer); - - buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE); - if (!buffer) - panic("%s: Failed to allocate memory for receive buffer!\n", __func__); - - descr->buf = virt_to_phys(buffer->buffer); - - return recvl; -} - -static unsigned int handle_all_descr_data(struct e100_serial *info) -{ - struct etrax_dma_descr *descr; - unsigned int recvl; - unsigned int ret = 0; - - while (1) - { - descr = &info->rec_descr[info->cur_rec_descr]; - - if (descr == phys_to_virt(*info->idescradr)) - break; - - if (++info->cur_rec_descr == SERIAL_RECV_DESCRIPTORS) - info->cur_rec_descr = 0; - - /* find out how many bytes were read */ - - /* if the eop bit was not set, all data has been received */ - if (!(descr->status & d_eop)) { - recvl = descr->sw_len; - } else { - /* otherwise we find the amount of data received here */ - recvl = descr->hw_len; - } - - /* Reset the status information */ - descr->status = 0; - - DFLOW( DEBUG_LOG(info->line, "RX %lu\n", recvl); - if (info->port.tty->stopped) { - unsigned char *buf = phys_to_virt(descr->buf); - DEBUG_LOG(info->line, "rx 0x%02X\n", buf[0]); - DEBUG_LOG(info->line, "rx 0x%02X\n", buf[1]); - DEBUG_LOG(info->line, "rx 0x%02X\n", buf[2]); - } - ); - - /* update stats */ - info->icount.rx += recvl; - - ret += handle_descr_data(info, descr, recvl); - } - - return ret; -} - -static void receive_chars_dma(struct e100_serial *info) -{ - struct tty_struct *tty; - unsigned char rstat; - - /* Acknowledge both dma_descr and dma_eop irq in R_DMA_CHx_CLR_INTR */ - *info->iclrintradr = - IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | - IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); - - tty = info->port.tty; - if (!tty) /* Something wrong... */ - return; - -#ifdef SERIAL_HANDLE_EARLY_ERRORS - if (info->uses_dma_in) - e100_enable_serial_data_irq(info); -#endif - - if (info->errorcode == ERRCODE_INSERT_BREAK) - add_char_and_flag(info, '\0', TTY_BREAK); - - handle_all_descr_data(info); - - /* Read the status register to detect errors */ - rstat = info->ioport[REG_STATUS]; - if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { - DFLOW(DEBUG_LOG(info->line, "XOFF detect stat %x\n", rstat)); - } - - if (rstat & SER_ERROR_MASK) { - /* If we got an error, we must reset it by reading the - * data_in field - */ - unsigned char data = info->ioport[REG_DATA]; - - DEBUG_LOG(info->line, "#dERR: s d 0x%04X\n", - ((rstat & SER_ERROR_MASK) << 8) | data); - - if (rstat & SER_PAR_ERR_MASK) - add_char_and_flag(info, data, TTY_PARITY); - else if (rstat & SER_OVERRUN_MASK) - add_char_and_flag(info, data, TTY_OVERRUN); - else if (rstat & SER_FRAMING_ERR_MASK) - add_char_and_flag(info, data, TTY_FRAME); - } - - START_FLUSH_FAST_TIMER(info, "receive_chars"); - - /* Restart the receiving DMA */ - *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); -} - -static int start_recv_dma(struct e100_serial *info) -{ - struct etrax_dma_descr *descr = info->rec_descr; - struct etrax_recv_buffer *buffer; - int i; - - /* Set up the receiving descriptors */ - for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) { - buffer = alloc_recv_buffer(SERIAL_DESCR_BUF_SIZE); - if (!buffer) - panic("%s: Failed to allocate memory for receive buffer!\n", __func__); - - descr[i].ctrl = d_int; - descr[i].buf = virt_to_phys(buffer->buffer); - descr[i].sw_len = SERIAL_DESCR_BUF_SIZE; - descr[i].hw_len = 0; - descr[i].status = 0; - descr[i].next = virt_to_phys(&descr[i+1]); - } - - /* Link the last descriptor to the first */ - descr[i-1].next = virt_to_phys(&descr[0]); - - /* Start with the first descriptor in the list */ - info->cur_rec_descr = 0; - - /* Start the DMA */ - *info->ifirstadr = virt_to_phys(&descr[info->cur_rec_descr]); - *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, start); - - /* Input DMA should be running now */ - return 1; -} - -static void -start_receive(struct e100_serial *info) -{ - if (info->uses_dma_in) { - /* reset the input dma channel to be sure it works */ - - *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); - while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == - IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); - - start_recv_dma(info); - } -} - - -/* the bits in the MASK2 register are laid out like this: - DMAI_EOP DMAI_DESCR DMAO_EOP DMAO_DESCR - where I is the input channel and O is the output channel for the port. - info->irq is the bit number for the DMAO_DESCR so to check the others we - shift info->irq to the left. -*/ - -/* dma output channel interrupt handler - this interrupt is called from DMA2(ser2), DMA4(ser3), DMA6(ser0) or - DMA8(ser1) when they have finished a descriptor with the intr flag set. -*/ - -static irqreturn_t -tr_interrupt(int irq, void *dev_id) -{ - struct e100_serial *info; - unsigned long ireg; - int i; - int handled = 0; - - /* find out the line that caused this irq and get it from rs_table */ - - ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ - - for (i = 0; i < NR_PORTS; i++) { - info = rs_table + i; - if (!info->enabled || !info->uses_dma_out) - continue; - /* check for dma_descr (don't need to check for dma_eop in output dma for serial */ - if (ireg & info->irq) { - handled = 1; - /* we can send a new dma bunch. make it so. */ - DINTR2(DEBUG_LOG(info->line, "tr_interrupt %i\n", i)); - /* Read jiffies_usec first, - * we want this time to be as late as possible - */ - info->last_tx_active_usec = GET_JIFFIES_USEC(); - info->last_tx_active = jiffies; - transmit_chars_dma(info); - } - - /* FIXME: here we should really check for a change in the - status lines and if so call status_handle(info) */ - } - return IRQ_RETVAL(handled); -} /* tr_interrupt */ - -/* dma input channel interrupt handler */ - -static irqreturn_t -rec_interrupt(int irq, void *dev_id) -{ - struct e100_serial *info; - unsigned long ireg; - int i; - int handled = 0; - - /* find out the line that caused this irq and get it from rs_table */ - - ireg = *R_IRQ_MASK2_RD; /* get the active irq bits for the dma channels */ - - for (i = 0; i < NR_PORTS; i++) { - info = rs_table + i; - if (!info->enabled || !info->uses_dma_in) - continue; - /* check for both dma_eop and dma_descr for the input dma channel */ - if (ireg & ((info->irq << 2) | (info->irq << 3))) { - handled = 1; - /* we have received something */ - receive_chars_dma(info); - } - - /* FIXME: here we should really check for a change in the - status lines and if so call status_handle(info) */ - } - return IRQ_RETVAL(handled); -} /* rec_interrupt */ - -static int force_eop_if_needed(struct e100_serial *info) -{ - /* We check data_avail bit to determine if data has - * arrived since last time - */ - unsigned char rstat = info->ioport[REG_STATUS]; - - /* error or datavail? */ - if (rstat & SER_ERROR_MASK) { - /* Some error has occurred. If there has been valid data, an - * EOP interrupt will be made automatically. If no data, the - * normal ser_interrupt should be enabled and handle it. - * So do nothing! - */ - DEBUG_LOG(info->line, "timeout err: rstat 0x%03X\n", - rstat | (info->line << 8)); - return 0; - } - - if (rstat & SER_DATA_AVAIL_MASK) { - /* Ok data, no error, count it */ - TIMERD(DEBUG_LOG(info->line, "timeout: rstat 0x%03X\n", - rstat | (info->line << 8))); - /* Read data to clear status flags */ - (void)info->ioport[REG_DATA]; - - info->forced_eop = 0; - START_FLUSH_FAST_TIMER(info, "magic"); - return 0; - } - - /* hit the timeout, force an EOP for the input - * dma channel if we haven't already - */ - if (!info->forced_eop) { - info->forced_eop = 1; - TIMERD(DEBUG_LOG(info->line, "timeout EOP %i\n", info->line)); - FORCE_EOP(info); - } - - return 1; -} - -static void flush_to_flip_buffer(struct e100_serial *info) -{ - struct etrax_recv_buffer *buffer; - unsigned long flags; - - local_irq_save(flags); - - while ((buffer = info->first_recv_buffer) != NULL) { - unsigned int count = buffer->length; - - tty_insert_flip_string(&info->port, buffer->buffer, count); - info->recv_cnt -= count; - - if (count == buffer->length) { - info->first_recv_buffer = buffer->next; - kfree(buffer); - } else { - buffer->length -= count; - memmove(buffer->buffer, buffer->buffer + count, buffer->length); - buffer->error = TTY_NORMAL; - } - } - - if (!info->first_recv_buffer) - info->last_recv_buffer = NULL; - - local_irq_restore(flags); - - /* This includes a check for low-latency */ - tty_flip_buffer_push(&info->port); -} - -static void check_flush_timeout(struct e100_serial *info) -{ - /* Flip what we've got (if we can) */ - flush_to_flip_buffer(info); - - /* We might need to flip later, but not to fast - * since the system is busy processing input... */ - if (info->first_recv_buffer) - START_FLUSH_FAST_TIMER_TIME(info, "flip", 2000); - - /* Force eop last, since data might have come while we're processing - * and if we started the slow timer above, we won't start a fast - * below. - */ - force_eop_if_needed(info); -} - -#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER -static void flush_timeout_function(unsigned long data) -{ - struct e100_serial *info = (struct e100_serial *)data; - - fast_timers[info->line].function = NULL; - serial_fast_timer_expired++; - TIMERD(DEBUG_LOG(info->line, "flush_timeout %i ", info->line)); - TIMERD(DEBUG_LOG(info->line, "num expired: %i\n", serial_fast_timer_expired)); - check_flush_timeout(info); -} - -#else - -/* dma fifo/buffer timeout handler - forces an end-of-packet for the dma input channel if no chars - have been received for CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS/100 s. -*/ - -static struct timer_list flush_timer; - -static void -timed_flush_handler(struct timer_list *unused) -{ - struct e100_serial *info; - int i; - - for (i = 0; i < NR_PORTS; i++) { - info = rs_table + i; - if (info->uses_dma_in) - check_flush_timeout(info); - } - - /* restart flush timer */ - mod_timer(&flush_timer, jiffies + CONFIG_ETRAX_SERIAL_RX_TIMEOUT_TICKS); -} -#endif - -#ifdef SERIAL_HANDLE_EARLY_ERRORS - -/* If there is an error (ie break) when the DMA is running and - * there are no bytes in the fifo the DMA is stopped and we get no - * eop interrupt. Thus we have to monitor the first bytes on a DMA - * transfer, and if it is without error we can turn the serial - * interrupts off. - */ - -/* -BREAK handling on ETRAX 100: -ETRAX will generate interrupt although there is no stop bit between the -characters. - -Depending on how long the break sequence is, the end of the breaksequence -will look differently: -| indicates start/end of a character. - -B= Break character (0x00) with framing error. -E= Error byte with parity error received after B characters. -F= "Faked" valid byte received immediately after B characters. -V= Valid byte - -1. - B BL ___________________________ V -.._|__________|__________| |valid data | - -Multiple frame errors with data == 0x00 (B), -the timing matches up "perfectly" so no extra ending char is detected. -The RXD pin is 1 in the last interrupt, in that case -we set info->errorcode = ERRCODE_INSERT_BREAK, but we can't really -know if another byte will come and this really is case 2. below -(e.g F=0xFF or 0xFE) -If RXD pin is 0 we can expect another character (see 2. below). - - -2. - - B B E or F__________________..__ V -.._|__________|__________|______ | |valid data - "valid" or - parity error - -Multiple frame errors with data == 0x00 (B), -but the part of the break trigs is interpreted as a start bit (and possibly -some 0 bits followed by a number of 1 bits and a stop bit). -Depending on parity settings etc. this last character can be either -a fake "valid" char (F) or have a parity error (E). - -If the character is valid it will be put in the buffer, -we set info->errorcode = ERRCODE_SET_BREAK so the receive interrupt -will set the flags so the tty will handle it, -if it's an error byte it will not be put in the buffer -and we set info->errorcode = ERRCODE_INSERT_BREAK. - -To distinguish a V byte in 1. from an F byte in 2. we keep a timestamp -of the last faulty char (B) and compares it with the current time: -If the time elapsed time is less then 2*char_time_usec we will assume -it's a faked F char and not a Valid char and set -info->errorcode = ERRCODE_SET_BREAK. - -Flaws in the above solution: -~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -We use the timer to distinguish a F character from a V character, -if a V character is to close after the break we might make the wrong decision. - -TODO: The break will be delayed until an F or V character is received. - -*/ - -static void handle_ser_rx_interrupt_no_dma(struct e100_serial *info) -{ - unsigned long data_read; - - /* Read data and status at the same time */ - data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); -more_data: - if (data_read & IO_MASK(R_SERIAL0_READ, xoff_detect) ) { - DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); - } - DINTR2(DEBUG_LOG(info->line, "ser_rx %c\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read))); - - if (data_read & ( IO_MASK(R_SERIAL0_READ, framing_err) | - IO_MASK(R_SERIAL0_READ, par_err) | - IO_MASK(R_SERIAL0_READ, overrun) )) { - /* An error */ - info->last_rx_active_usec = GET_JIFFIES_USEC(); - info->last_rx_active = jiffies; - DINTR1(DEBUG_LOG(info->line, "ser_rx err stat_data %04X\n", data_read)); - DLOG_INT_TRIG( - if (!log_int_trig1_pos) { - log_int_trig1_pos = log_int_pos; - log_int(rdpc(), 0, 0); - } - ); - - - if ( ((data_read & IO_MASK(R_SERIAL0_READ, data_in)) == 0) && - (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) ) { - /* Most likely a break, but we get interrupts over and - * over again. - */ - - if (!info->break_detected_cnt) { - DEBUG_LOG(info->line, "#BRK start\n", 0); - } - if (data_read & IO_MASK(R_SERIAL0_READ, rxd)) { - /* The RX pin is high now, so the break - * must be over, but.... - * we can't really know if we will get another - * last byte ending the break or not. - * And we don't know if the byte (if any) will - * have an error or look valid. - */ - DEBUG_LOG(info->line, "# BL BRK\n", 0); - info->errorcode = ERRCODE_INSERT_BREAK; - } - info->break_detected_cnt++; - } else { - /* The error does not look like a break, but could be - * the end of one - */ - if (info->break_detected_cnt) { - DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); - info->errorcode = ERRCODE_INSERT_BREAK; - } else { - unsigned char data = IO_EXTRACT(R_SERIAL0_READ, - data_in, data_read); - char flag = TTY_NORMAL; - if (info->errorcode == ERRCODE_INSERT_BREAK) { - tty_insert_flip_char(&info->port, 0, flag); - info->icount.rx++; - } - - if (data_read & IO_MASK(R_SERIAL0_READ, par_err)) { - info->icount.parity++; - flag = TTY_PARITY; - } else if (data_read & IO_MASK(R_SERIAL0_READ, overrun)) { - info->icount.overrun++; - flag = TTY_OVERRUN; - } else if (data_read & IO_MASK(R_SERIAL0_READ, framing_err)) { - info->icount.frame++; - flag = TTY_FRAME; - } - tty_insert_flip_char(&info->port, data, flag); - info->errorcode = 0; - } - info->break_detected_cnt = 0; - } - } else if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { - /* No error */ - DLOG_INT_TRIG( - if (!log_int_trig1_pos) { - if (log_int_pos >= log_int_size) { - log_int_pos = 0; - } - log_int_trig0_pos = log_int_pos; - log_int(rdpc(), 0, 0); - } - ); - tty_insert_flip_char(&info->port, - IO_EXTRACT(R_SERIAL0_READ, data_in, data_read), - TTY_NORMAL); - } else { - DEBUG_LOG(info->line, "ser_rx int but no data_avail %08lX\n", data_read); - } - - - info->icount.rx++; - data_read = *((unsigned long *)&info->ioport[REG_DATA_STATUS32]); - if (data_read & IO_MASK(R_SERIAL0_READ, data_avail)) { - DEBUG_LOG(info->line, "ser_rx %c in loop\n", IO_EXTRACT(R_SERIAL0_READ, data_in, data_read)); - goto more_data; - } - - tty_flip_buffer_push(&info->port); -} - -static void handle_ser_rx_interrupt(struct e100_serial *info) -{ - unsigned char rstat; - -#ifdef SERIAL_DEBUG_INTR - printk("Interrupt from serport %d\n", i); -#endif -/* DEBUG_LOG(info->line, "ser_interrupt stat %03X\n", rstat | (i << 8)); */ - if (!info->uses_dma_in) { - handle_ser_rx_interrupt_no_dma(info); - return; - } - /* DMA is used */ - rstat = info->ioport[REG_STATUS]; - if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect) ) { - DFLOW(DEBUG_LOG(info->line, "XOFF detect\n", 0)); - } - - if (rstat & SER_ERROR_MASK) { - unsigned char data; - - info->last_rx_active_usec = GET_JIFFIES_USEC(); - info->last_rx_active = jiffies; - /* If we got an error, we must reset it by reading the - * data_in field - */ - data = info->ioport[REG_DATA]; - DINTR1(DEBUG_LOG(info->line, "ser_rx! %c\n", data)); - DINTR1(DEBUG_LOG(info->line, "ser_rx err stat %02X\n", rstat)); - if (!data && (rstat & SER_FRAMING_ERR_MASK)) { - /* Most likely a break, but we get interrupts over and - * over again. - */ - - if (!info->break_detected_cnt) { - DEBUG_LOG(info->line, "#BRK start\n", 0); - } - if (rstat & SER_RXD_MASK) { - /* The RX pin is high now, so the break - * must be over, but.... - * we can't really know if we will get another - * last byte ending the break or not. - * And we don't know if the byte (if any) will - * have an error or look valid. - */ - DEBUG_LOG(info->line, "# BL BRK\n", 0); - info->errorcode = ERRCODE_INSERT_BREAK; - } - info->break_detected_cnt++; - } else { - /* The error does not look like a break, but could be - * the end of one - */ - if (info->break_detected_cnt) { - DEBUG_LOG(info->line, "EBRK %i\n", info->break_detected_cnt); - info->errorcode = ERRCODE_INSERT_BREAK; - } else { - if (info->errorcode == ERRCODE_INSERT_BREAK) { - info->icount.brk++; - add_char_and_flag(info, '\0', TTY_BREAK); - } - - if (rstat & SER_PAR_ERR_MASK) { - info->icount.parity++; - add_char_and_flag(info, data, TTY_PARITY); - } else if (rstat & SER_OVERRUN_MASK) { - info->icount.overrun++; - add_char_and_flag(info, data, TTY_OVERRUN); - } else if (rstat & SER_FRAMING_ERR_MASK) { - info->icount.frame++; - add_char_and_flag(info, data, TTY_FRAME); - } - - info->errorcode = 0; - } - info->break_detected_cnt = 0; - DEBUG_LOG(info->line, "#iERR s d %04X\n", - ((rstat & SER_ERROR_MASK) << 8) | data); - } - } else { /* It was a valid byte, now let the DMA do the rest */ - unsigned long curr_time_u = GET_JIFFIES_USEC(); - unsigned long curr_time = jiffies; - - if (info->break_detected_cnt) { - /* Detect if this character is a new valid char or the - * last char in a break sequence: If LSBits are 0 and - * MSBits are high AND the time is close to the - * previous interrupt we should discard it. - */ - long elapsed_usec = - (curr_time - info->last_rx_active) * (1000000/HZ) + - curr_time_u - info->last_rx_active_usec; - if (elapsed_usec < 2*info->char_time_usec) { - DEBUG_LOG(info->line, "FBRK %i\n", info->line); - /* Report as BREAK (error) and let - * receive_chars_dma() handle it - */ - info->errorcode = ERRCODE_SET_BREAK; - } else { - DEBUG_LOG(info->line, "Not end of BRK (V)%i\n", info->line); - } - DEBUG_LOG(info->line, "num brk %i\n", info->break_detected_cnt); - } - -#ifdef SERIAL_DEBUG_INTR - printk("** OK, disabling ser_interrupts\n"); -#endif - e100_disable_serial_data_irq(info); - DINTR2(DEBUG_LOG(info->line, "ser_rx OK %d\n", info->line)); - info->break_detected_cnt = 0; - - } - /* Restarting the DMA never hurts */ - *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, restart); - START_FLUSH_FAST_TIMER(info, "ser_int"); -} /* handle_ser_rx_interrupt */ - -static void handle_ser_tx_interrupt(struct e100_serial *info) -{ - unsigned long flags; - - if (info->x_char) { - unsigned char rstat; - DFLOW(DEBUG_LOG(info->line, "tx_int: xchar 0x%02X\n", info->x_char)); - local_irq_save(flags); - rstat = info->ioport[REG_STATUS]; - DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); - - info->ioport[REG_TR_DATA] = info->x_char; - info->icount.tx++; - info->x_char = 0; - /* We must enable since it is disabled in ser_interrupt */ - e100_enable_serial_tx_ready_irq(info); - local_irq_restore(flags); - return; - } - if (info->uses_dma_out) { - unsigned char rstat; - int i; - /* We only use normal tx interrupt when sending x_char */ - DFLOW(DEBUG_LOG(info->line, "tx_int: xchar sent\n", 0)); - local_irq_save(flags); - rstat = info->ioport[REG_STATUS]; - DFLOW(DEBUG_LOG(info->line, "stat %x\n", rstat)); - e100_disable_serial_tx_ready_irq(info); - if (info->port.tty->stopped) - rs_stop(info->port.tty); - /* Enable the DMA channel and tell it to continue */ - e100_enable_txdma_channel(info); - /* Wait 12 cycles before doing the DMA command */ - for(i = 6; i > 0; i--) - nop(); - - *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, continue); - local_irq_restore(flags); - return; - } - /* Normal char-by-char interrupt */ - if (info->xmit.head == info->xmit.tail - || info->port.tty->stopped) { - DFLOW(DEBUG_LOG(info->line, "tx_int: stopped %i\n", - info->port.tty->stopped)); - e100_disable_serial_tx_ready_irq(info); - info->tr_running = 0; - return; - } - DINTR2(DEBUG_LOG(info->line, "tx_int %c\n", info->xmit.buf[info->xmit.tail])); - /* Send a byte, rs485 timing is critical so turn of ints */ - local_irq_save(flags); - info->ioport[REG_TR_DATA] = info->xmit.buf[info->xmit.tail]; - info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1); - info->icount.tx++; - if (info->xmit.head == info->xmit.tail) { -#if defined(CONFIG_ETRAX_RS485) && defined(CONFIG_ETRAX_FAST_TIMER) - if (info->rs485.flags & SER_RS485_ENABLED) { - /* Set a short timer to toggle RTS */ - start_one_shot_timer(&fast_timers_rs485[info->line], - rs485_toggle_rts_timer_function, - (unsigned long)info, - info->char_time_usec*2, - "RS-485"); - } -#endif /* RS485 */ - info->last_tx_active_usec = GET_JIFFIES_USEC(); - info->last_tx_active = jiffies; - e100_disable_serial_tx_ready_irq(info); - info->tr_running = 0; - DFLOW(DEBUG_LOG(info->line, "tx_int: stop2\n", 0)); - } else { - /* We must enable since it is disabled in ser_interrupt */ - e100_enable_serial_tx_ready_irq(info); - } - local_irq_restore(flags); - - if (CIRC_CNT(info->xmit.head, - info->xmit.tail, - SERIAL_XMIT_SIZE) < WAKEUP_CHARS) - rs_sched_event(info, RS_EVENT_WRITE_WAKEUP); - -} /* handle_ser_tx_interrupt */ - -/* result of time measurements: - * RX duration 54-60 us when doing something, otherwise 6-9 us - * ser_int duration: just sending: 8-15 us normally, up to 73 us - */ -static irqreturn_t -ser_interrupt(int irq, void *dev_id) -{ - static volatile int tx_started = 0; - struct e100_serial *info; - int i; - unsigned long flags; - unsigned long irq_mask1_rd; - unsigned long data_mask = (1 << (8+2*0)); /* ser0 data_avail */ - int handled = 0; - static volatile unsigned long reentered_ready_mask = 0; - - local_irq_save(flags); - irq_mask1_rd = *R_IRQ_MASK1_RD; - /* First handle all rx interrupts with ints disabled */ - info = rs_table; - irq_mask1_rd &= e100_ser_int_mask; - for (i = 0; i < NR_PORTS; i++) { - /* Which line caused the data irq? */ - if (irq_mask1_rd & data_mask) { - handled = 1; - handle_ser_rx_interrupt(info); - } - info += 1; - data_mask <<= 2; - } - /* Handle tx interrupts with interrupts enabled so we - * can take care of new data interrupts while transmitting - * We protect the tx part with the tx_started flag. - * We disable the tr_ready interrupts we are about to handle and - * unblock the serial interrupt so new serial interrupts may come. - * - * If we get a new interrupt: - * - it migth be due to synchronous serial ports. - * - serial irq will be blocked by general irq handler. - * - async data will be handled above (sync will be ignored). - * - tx_started flag will prevent us from trying to send again and - * we will exit fast - no need to unblock serial irq. - * - Next (sync) serial interrupt handler will be runned with - * disabled interrupt due to restore_flags() at end of function, - * so sync handler will not be preempted or reentered. - */ - if (!tx_started) { - unsigned long ready_mask; - unsigned long - tx_started = 1; - /* Only the tr_ready interrupts left */ - irq_mask1_rd &= (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | - IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | - IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | - IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); - while (irq_mask1_rd) { - /* Disable those we are about to handle */ - *R_IRQ_MASK1_CLR = irq_mask1_rd; - /* Unblock the serial interrupt */ - *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set); - - local_irq_enable(); - ready_mask = (1 << (8+1+2*0)); /* ser0 tr_ready */ - info = rs_table; - for (i = 0; i < NR_PORTS; i++) { - /* Which line caused the ready irq? */ - if (irq_mask1_rd & ready_mask) { - handled = 1; - handle_ser_tx_interrupt(info); - } - info += 1; - ready_mask <<= 2; - } - /* handle_ser_tx_interrupt enables tr_ready interrupts */ - local_irq_disable(); - /* Handle reentered TX interrupt */ - irq_mask1_rd = reentered_ready_mask; - } - local_irq_disable(); - tx_started = 0; - } else { - unsigned long ready_mask; - ready_mask = irq_mask1_rd & (IO_MASK(R_IRQ_MASK1_RD, ser0_ready) | - IO_MASK(R_IRQ_MASK1_RD, ser1_ready) | - IO_MASK(R_IRQ_MASK1_RD, ser2_ready) | - IO_MASK(R_IRQ_MASK1_RD, ser3_ready)); - if (ready_mask) { - reentered_ready_mask |= ready_mask; - /* Disable those we are about to handle */ - *R_IRQ_MASK1_CLR = ready_mask; - DFLOW(DEBUG_LOG(SERIAL_DEBUG_LINE, "ser_int reentered with TX %X\n", ready_mask)); - } - } - - local_irq_restore(flags); - return IRQ_RETVAL(handled); -} /* ser_interrupt */ -#endif - -/* - * ------------------------------------------------------------------- - * Here ends the serial interrupt routines. - * ------------------------------------------------------------------- - */ - -/* - * This routine is used to handle the "bottom half" processing for the - * serial driver, known also the "software interrupt" processing. - * This processing is done at the kernel interrupt level, after the - * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This - * is where time-consuming activities which can not be done in the - * interrupt driver proper are done; the interrupt driver schedules - * them using rs_sched_event(), and they get done here. - */ -static void -do_softint(struct work_struct *work) -{ - struct e100_serial *info; - struct tty_struct *tty; - - info = container_of(work, struct e100_serial, work); - - tty = info->port.tty; - if (!tty) - return; - - if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) - tty_wakeup(tty); -} - -static int -startup(struct e100_serial * info) -{ - unsigned long flags; - unsigned long xmit_page; - int i; - - xmit_page = get_zeroed_page(GFP_KERNEL); - if (!xmit_page) - return -ENOMEM; - - local_irq_save(flags); - - /* if it was already initialized, skip this */ - - if (tty_port_initialized(&info->port)) { - local_irq_restore(flags); - free_page(xmit_page); - return 0; - } - - if (info->xmit.buf) - free_page(xmit_page); - else - info->xmit.buf = (unsigned char *) xmit_page; - -#ifdef SERIAL_DEBUG_OPEN - printk("starting up ttyS%d (xmit_buf 0x%p)...\n", info->line, info->xmit.buf); -#endif - - /* - * Clear the FIFO buffers and disable them - * (they will be reenabled in change_speed()) - */ - - /* - * Reset the DMA channels and make sure their interrupts are cleared - */ - - if (info->dma_in_enabled) { - info->uses_dma_in = 1; - e100_enable_rxdma_channel(info); - - *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); - - /* Wait until reset cycle is complete */ - while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->icmdadr) == - IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); - - /* Make sure the irqs are cleared */ - *info->iclrintradr = - IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | - IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); - } else { - e100_disable_rxdma_channel(info); - } - - if (info->dma_out_enabled) { - info->uses_dma_out = 1; - e100_enable_txdma_channel(info); - *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); - - while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) == - IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, reset)); - - /* Make sure the irqs are cleared */ - *info->oclrintradr = - IO_STATE(R_DMA_CH6_CLR_INTR, clr_descr, do) | - IO_STATE(R_DMA_CH6_CLR_INTR, clr_eop, do); - } else { - e100_disable_txdma_channel(info); - } - - if (info->port.tty) - clear_bit(TTY_IO_ERROR, &info->port.tty->flags); - - info->xmit.head = info->xmit.tail = 0; - info->first_recv_buffer = info->last_recv_buffer = NULL; - info->recv_cnt = info->max_recv_cnt = 0; - - for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) - info->rec_descr[i].buf = 0; - - /* - * and set the speed and other flags of the serial port - * this will start the rx/tx as well - */ -#ifdef SERIAL_HANDLE_EARLY_ERRORS - e100_enable_serial_data_irq(info); -#endif - change_speed(info); - - /* dummy read to reset any serial errors */ - - (void)info->ioport[REG_DATA]; - - /* enable the interrupts */ - if (info->uses_dma_out) - e100_enable_txdma_irq(info); - - e100_enable_rx_irq(info); - - info->tr_running = 0; /* to be sure we don't lock up the transmitter */ - - /* setup the dma input descriptor and start dma */ - - start_receive(info); - - /* for safety, make sure the descriptors last result is 0 bytes written */ - - info->tr_descr.sw_len = 0; - info->tr_descr.hw_len = 0; - info->tr_descr.status = 0; - - /* enable RTS/DTR last */ - - e100_rts(info, 1); - e100_dtr(info, 1); - - tty_port_set_initialized(&info->port, 1); - - local_irq_restore(flags); - return 0; -} - -/* - * This routine will shutdown a serial port; interrupts are disabled, and - * DTR is dropped if the hangup on close termio flag is on. - */ -static void -shutdown(struct e100_serial * info) -{ - unsigned long flags; - struct etrax_dma_descr *descr = info->rec_descr; - struct etrax_recv_buffer *buffer; - int i; - - /* shut down the transmitter and receiver */ - DFLOW(DEBUG_LOG(info->line, "shutdown %i\n", info->line)); - e100_disable_rx(info); - info->ioport[REG_TR_CTRL] = (info->tx_ctrl &= ~0x40); - - /* disable interrupts, reset dma channels */ - if (info->uses_dma_in) { - e100_disable_rxdma_irq(info); - *info->icmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); - info->uses_dma_in = 0; - } else { - e100_disable_serial_data_irq(info); - } - - if (info->uses_dma_out) { - e100_disable_txdma_irq(info); - info->tr_running = 0; - *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, reset); - info->uses_dma_out = 0; - } else { - e100_disable_serial_tx_ready_irq(info); - info->tr_running = 0; - } - - if (!tty_port_initialized(&info->port)) - return; - -#ifdef SERIAL_DEBUG_OPEN - printk("Shutting down serial port %d (irq %d)....\n", info->line, - info->irq); -#endif - - local_irq_save(flags); - - if (info->xmit.buf) { - free_page((unsigned long)info->xmit.buf); - info->xmit.buf = NULL; - } - - for (i = 0; i < SERIAL_RECV_DESCRIPTORS; i++) - if (descr[i].buf) { - buffer = phys_to_virt(descr[i].buf) - sizeof *buffer; - kfree(buffer); - descr[i].buf = 0; - } - - if (!info->port.tty || (info->port.tty->termios.c_cflag & HUPCL)) { - /* hang up DTR and RTS if HUPCL is enabled */ - e100_dtr(info, 0); - e100_rts(info, 0); /* could check CRTSCTS before doing this */ - } - - if (info->port.tty) - set_bit(TTY_IO_ERROR, &info->port.tty->flags); - - tty_port_set_initialized(&info->port, 0); - local_irq_restore(flags); -} - - -/* change baud rate and other assorted parameters */ - -static void -change_speed(struct e100_serial *info) -{ - unsigned int cflag; - unsigned long xoff; - unsigned long flags; - /* first some safety checks */ - - if (!info->port.tty) - return; - if (!info->ioport) - return; - - cflag = info->port.tty->termios.c_cflag; - - /* possibly, the tx/rx should be disabled first to do this safely */ - - /* change baud-rate and write it to the hardware */ - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) { - /* Special baudrate */ - u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ - unsigned long alt_source = - IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | - IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); - /* R_ALT_SER_BAUDRATE selects the source */ - DBAUD(printk("Custom baudrate: baud_base/divisor %lu/%i\n", - (unsigned long)info->baud_base, info->custom_divisor)); - if (info->baud_base == SERIAL_PRESCALE_BASE) { - /* 0, 2-65535 (0=65536) */ - u16 divisor = info->custom_divisor; - /* R_SERIAL_PRESCALE (upper 16 bits of R_CLOCK_PRESCALE) */ - /* baudrate is 3.125MHz/custom_divisor */ - alt_source = - IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, prescale) | - IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, prescale); - alt_source = 0x11; - DBAUD(printk("Writing SERIAL_PRESCALE: divisor %i\n", divisor)); - *R_SERIAL_PRESCALE = divisor; - info->baud = SERIAL_PRESCALE_BASE/divisor; - } - else - { - /* Bad baudbase, we don't support using timer0 - * for baudrate. - */ - printk(KERN_WARNING "Bad baud_base/custom_divisor: %lu/%i\n", - (unsigned long)info->baud_base, info->custom_divisor); - } - r_alt_ser_baudrate_shadow &= ~mask; - r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); - *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; - } else { - /* Normal baudrate */ - /* Make sure we use normal baudrate */ - u32 mask = 0xFF << (info->line*8); /* Each port has 8 bits */ - unsigned long alt_source = - IO_STATE(R_ALT_SER_BAUDRATE, ser0_rec, normal) | - IO_STATE(R_ALT_SER_BAUDRATE, ser0_tr, normal); - r_alt_ser_baudrate_shadow &= ~mask; - r_alt_ser_baudrate_shadow |= (alt_source << (info->line*8)); - *R_ALT_SER_BAUDRATE = r_alt_ser_baudrate_shadow; - - info->baud = cflag_to_baud(cflag); - info->ioport[REG_BAUD] = cflag_to_etrax_baud(cflag); - } - - /* start with default settings and then fill in changes */ - local_irq_save(flags); - /* 8 bit, no/even parity */ - info->rx_ctrl &= ~(IO_MASK(R_SERIAL0_REC_CTRL, rec_bitnr) | - IO_MASK(R_SERIAL0_REC_CTRL, rec_par_en) | - IO_MASK(R_SERIAL0_REC_CTRL, rec_par)); - - /* 8 bit, no/even parity, 1 stop bit, no cts */ - info->tx_ctrl &= ~(IO_MASK(R_SERIAL0_TR_CTRL, tr_bitnr) | - IO_MASK(R_SERIAL0_TR_CTRL, tr_par_en) | - IO_MASK(R_SERIAL0_TR_CTRL, tr_par) | - IO_MASK(R_SERIAL0_TR_CTRL, stop_bits) | - IO_MASK(R_SERIAL0_TR_CTRL, auto_cts)); - - if ((cflag & CSIZE) == CS7) { - /* set 7 bit mode */ - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit); - info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit); - } - - if (cflag & CSTOPB) { - /* set 2 stop bit mode */ - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, two_bits); - } - - if (cflag & PARENB) { - /* enable parity */ - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable); - info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable); - } - - if (cflag & CMSPAR) { - /* enable stick parity, PARODD mean Mark which matches ETRAX */ - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, stick); - info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, stick); - } - if (cflag & PARODD) { - /* set odd parity (or Mark if CMSPAR) */ - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd); - info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd); - } - - if (cflag & CRTSCTS) { - /* enable automatic CTS handling */ - DFLOW(DEBUG_LOG(info->line, "FLOW auto_cts enabled\n", 0)); - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, active); - } - - /* make sure the tx and rx are enabled */ - - info->tx_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable); - info->rx_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable); - - /* actually write the control regs to the hardware */ - - info->ioport[REG_TR_CTRL] = info->tx_ctrl; - info->ioport[REG_REC_CTRL] = info->rx_ctrl; - xoff = IO_FIELD(R_SERIAL0_XOFF, xoff_char, STOP_CHAR(info->port.tty)); - xoff |= IO_STATE(R_SERIAL0_XOFF, tx_stop, enable); - if (info->port.tty->termios.c_iflag & IXON ) { - DFLOW(DEBUG_LOG(info->line, "FLOW XOFF enabled 0x%02X\n", - STOP_CHAR(info->port.tty))); - xoff |= IO_STATE(R_SERIAL0_XOFF, auto_xoff, enable); - } - - *((unsigned long *)&info->ioport[REG_XOFF]) = xoff; - local_irq_restore(flags); - - update_char_time(info); - -} /* change_speed */ - -/* start transmitting chars NOW */ - -static void -rs_flush_chars(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - - if (info->tr_running || - info->xmit.head == info->xmit.tail || - tty->stopped || - !info->xmit.buf) - return; - -#ifdef SERIAL_DEBUG_FLOW - printk("rs_flush_chars\n"); -#endif - - /* this protection might not exactly be necessary here */ - - local_irq_save(flags); - start_transmit(info); - local_irq_restore(flags); -} - -static int rs_raw_write(struct tty_struct *tty, - const unsigned char *buf, int count) -{ - int c, ret = 0; - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - - /* first some sanity checks */ - - if (!info->xmit.buf) - return 0; - -#ifdef SERIAL_DEBUG_DATA - if (info->line == SERIAL_DEBUG_LINE) - printk("rs_raw_write (%d), status %d\n", - count, info->ioport[REG_STATUS]); -#endif - - local_save_flags(flags); - DFLOW(DEBUG_LOG(info->line, "write count %i ", count)); - DFLOW(DEBUG_LOG(info->line, "ldisc\n")); - - - /* The local_irq_disable/restore_flags pairs below are needed - * because the DMA interrupt handler moves the info->xmit values. - * the memcpy needs to be in the critical region unfortunately, - * because we need to read xmit values, memcpy, write xmit values - * in one atomic operation... this could perhaps be avoided by - * more clever design. - */ - local_irq_disable(); - while (count) { - c = CIRC_SPACE_TO_END(info->xmit.head, - info->xmit.tail, - SERIAL_XMIT_SIZE); - - if (count < c) - c = count; - if (c <= 0) - break; - - memcpy(info->xmit.buf + info->xmit.head, buf, c); - info->xmit.head = (info->xmit.head + c) & - (SERIAL_XMIT_SIZE-1); - buf += c; - count -= c; - ret += c; - } - local_irq_restore(flags); - - /* enable transmitter if not running, unless the tty is stopped - * this does not need IRQ protection since if tr_running == 0 - * the IRQ's are not running anyway for this port. - */ - DFLOW(DEBUG_LOG(info->line, "write ret %i\n", ret)); - - if (info->xmit.head != info->xmit.tail && - !tty->stopped && - !info->tr_running) { - start_transmit(info); - } - - return ret; -} /* raw_raw_write() */ - -static int -rs_write(struct tty_struct *tty, - const unsigned char *buf, int count) -{ -#if defined(CONFIG_ETRAX_RS485) - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - - if (info->rs485.flags & SER_RS485_ENABLED) - { - /* If we are in RS-485 mode, we need to toggle RTS and disable - * the receiver before initiating a DMA transfer - */ -#ifdef CONFIG_ETRAX_FAST_TIMER - /* Abort any started timer */ - fast_timers_rs485[info->line].function = NULL; - del_fast_timer(&fast_timers_rs485[info->line]); -#endif - e100_rts(info, (info->rs485.flags & SER_RS485_RTS_ON_SEND)); -#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) - e100_disable_rx(info); - e100_enable_rx_irq(info); -#endif - if (info->rs485.delay_rts_before_send > 0) - msleep(info->rs485.delay_rts_before_send); - } -#endif /* CONFIG_ETRAX_RS485 */ - - count = rs_raw_write(tty, buf, count); - -#if defined(CONFIG_ETRAX_RS485) - if (info->rs485.flags & SER_RS485_ENABLED) - { - unsigned int val; - /* If we are in RS-485 mode the following has to be done: - * wait until DMA is ready - * wait on transmit shift register - * toggle RTS - * enable the receiver - */ - - /* Sleep until all sent */ - tty_wait_until_sent(tty, 0); -#ifdef CONFIG_ETRAX_FAST_TIMER - /* Now sleep a little more so that shift register is empty */ - schedule_usleep(info->char_time_usec * 2); -#endif - /* wait on transmit shift register */ - do{ - get_lsr_info(info, &val); - }while (!(val & TIOCSER_TEMT)); - - e100_rts(info, (info->rs485.flags & SER_RS485_RTS_AFTER_SEND)); - -#if defined(CONFIG_ETRAX_RS485_DISABLE_RECEIVER) - e100_enable_rx(info); - e100_enable_rxdma_irq(info); -#endif - } -#endif /* CONFIG_ETRAX_RS485 */ - - return count; -} /* rs_write */ - - -/* how much space is available in the xmit buffer? */ - -static int -rs_write_room(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - - return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); -} - -/* How many chars are in the xmit buffer? - * This does not include any chars in the transmitter FIFO. - * Use wait_until_sent for waiting for FIFO drain. - */ - -static int -rs_chars_in_buffer(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - - return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); -} - -/* discard everything in the xmit buffer */ - -static void -rs_flush_buffer(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - - local_irq_save(flags); - info->xmit.head = info->xmit.tail = 0; - local_irq_restore(flags); - - tty_wakeup(tty); -} - -/* - * This function is used to send a high-priority XON/XOFF character to - * the device - * - * Since we use DMA we don't check for info->x_char in transmit_chars_dma(), - * but we do it in handle_ser_tx_interrupt(). - * We disable DMA channel and enable tx ready interrupt and write the - * character when possible. - */ -static void rs_send_xchar(struct tty_struct *tty, char ch) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - local_irq_save(flags); - if (info->uses_dma_out) { - /* Put the DMA on hold and disable the channel */ - *info->ocmdadr = IO_STATE(R_DMA_CH6_CMD, cmd, hold); - while (IO_EXTRACT(R_DMA_CH6_CMD, cmd, *info->ocmdadr) != - IO_STATE_VALUE(R_DMA_CH6_CMD, cmd, hold)); - e100_disable_txdma_channel(info); - } - - /* Must make sure transmitter is not stopped before we can transmit */ - if (tty->stopped) - rs_start(tty); - - /* Enable manual transmit interrupt and send from there */ - DFLOW(DEBUG_LOG(info->line, "rs_send_xchar 0x%02X\n", ch)); - info->x_char = ch; - e100_enable_serial_tx_ready_irq(info); - local_irq_restore(flags); -} - -/* - * ------------------------------------------------------------ - * rs_throttle() - * - * This routine is called by the upper-layer tty layer to signal that - * incoming characters should be throttled. - * ------------------------------------------------------------ - */ -static void -rs_throttle(struct tty_struct * tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; -#ifdef SERIAL_DEBUG_THROTTLE - printk("throttle %s ....\n", tty_name(tty)); -#endif - DFLOW(DEBUG_LOG(info->line,"rs_throttle\n")); - - /* Do RTS before XOFF since XOFF might take some time */ - if (C_CRTSCTS(tty)) { - /* Turn off RTS line */ - e100_rts(info, 0); - } - if (I_IXOFF(tty)) - rs_send_xchar(tty, STOP_CHAR(tty)); - -} - -static void -rs_unthrottle(struct tty_struct * tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; -#ifdef SERIAL_DEBUG_THROTTLE - printk("unthrottle %s ....\n", tty_name(tty)); -#endif - DFLOW(DEBUG_LOG(info->line,"rs_unthrottle ldisc\n")); - DFLOW(DEBUG_LOG(info->line,"rs_unthrottle flip.count: %i\n", tty->flip.count)); - /* Do RTS before XOFF since XOFF might take some time */ - if (C_CRTSCTS(tty)) { - /* Assert RTS line */ - e100_rts(info, 1); - } - - if (I_IXOFF(tty)) { - if (info->x_char) - info->x_char = 0; - else - rs_send_xchar(tty, START_CHAR(tty)); - } - -} - -/* - * ------------------------------------------------------------ - * rs_ioctl() and friends - * ------------------------------------------------------------ - */ - -static int -get_serial_info(struct e100_serial * info, - struct serial_struct * retinfo) -{ - struct serial_struct tmp; - - /* this is all probably wrong, there are a lot of fields - * here that we don't have in e100_serial and maybe we - * should set them to something else than 0. - */ - - memset(&tmp, 0, sizeof(tmp)); - tmp.type = info->type; - tmp.line = info->line; - tmp.port = (int)info->ioport; - tmp.irq = info->irq; - tmp.flags = info->port.flags; - tmp.baud_base = info->baud_base; - tmp.close_delay = info->port.close_delay; - tmp.closing_wait = info->port.closing_wait; - tmp.custom_divisor = info->custom_divisor; - if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) - return -EFAULT; - return 0; -} - -static int -set_serial_info(struct e100_serial *info, - struct serial_struct *new_info) -{ - struct serial_struct new_serial; - struct e100_serial old_info; - int retval = 0; - - if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) - return -EFAULT; - - old_info = *info; - - if (!capable(CAP_SYS_ADMIN)) { - if ((new_serial.type != info->type) || - (new_serial.close_delay != info->port.close_delay) || - ((new_serial.flags & ~ASYNC_USR_MASK) != - (info->port.flags & ~ASYNC_USR_MASK))) - return -EPERM; - info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) | - (new_serial.flags & ASYNC_USR_MASK)); - goto check_and_exit; - } - - if (info->port.count > 1) - return -EBUSY; - - /* - * OK, past this point, all the error checking has been done. - * At this point, we start making changes..... - */ - - info->baud_base = new_serial.baud_base; - info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) | - (new_serial.flags & ASYNC_FLAGS)); - info->custom_divisor = new_serial.custom_divisor; - info->type = new_serial.type; - info->port.close_delay = new_serial.close_delay; - info->port.closing_wait = new_serial.closing_wait; - info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0; - - check_and_exit: - if (tty_port_initialized(&info->port)) - change_speed(info); - else - retval = startup(info); - return retval; -} - -/* - * get_lsr_info - get line status register info - * - * Purpose: Let user call ioctl() to get info when the UART physically - * is emptied. On bus types like RS485, the transmitter must - * release the bus after transmitting. This must be done when - * the transmit shift register is empty, not be done when the - * transmit holding register is empty. This functionality - * allows an RS485 driver to be written in user space. - */ -static int -get_lsr_info(struct e100_serial * info, unsigned int *value) -{ - unsigned int result = TIOCSER_TEMT; - unsigned long curr_time = jiffies; - unsigned long curr_time_usec = GET_JIFFIES_USEC(); - unsigned long elapsed_usec = - (curr_time - info->last_tx_active) * 1000000/HZ + - curr_time_usec - info->last_tx_active_usec; - - if (info->xmit.head != info->xmit.tail || - elapsed_usec < 2*info->char_time_usec) { - result = 0; - } - - if (copy_to_user(value, &result, sizeof(int))) - return -EFAULT; - return 0; -} - -#ifdef SERIAL_DEBUG_IO -struct state_str -{ - int state; - const char *str; -}; - -const struct state_str control_state_str[] = { - {TIOCM_DTR, "DTR" }, - {TIOCM_RTS, "RTS"}, - {TIOCM_ST, "ST?" }, - {TIOCM_SR, "SR?" }, - {TIOCM_CTS, "CTS" }, - {TIOCM_CD, "CD" }, - {TIOCM_RI, "RI" }, - {TIOCM_DSR, "DSR" }, - {0, NULL } -}; - -char *get_control_state_str(int MLines, char *s) -{ - int i = 0; - - s[0]='\0'; - while (control_state_str[i].str != NULL) { - if (MLines & control_state_str[i].state) { - if (s[0] != '\0') { - strcat(s, ", "); - } - strcat(s, control_state_str[i].str); - } - i++; - } - return s; -} -#endif - -static int -rs_break(struct tty_struct *tty, int break_state) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - - if (!info->ioport) - return -EIO; - - local_irq_save(flags); - if (break_state == -1) { - /* Go to manual mode and set the txd pin to 0 */ - /* Clear bit 7 (txd) and 6 (tr_enable) */ - info->tx_ctrl &= 0x3F; - } else { - /* Set bit 7 (txd) and 6 (tr_enable) */ - info->tx_ctrl |= (0x80 | 0x40); - } - info->ioport[REG_TR_CTRL] = info->tx_ctrl; - local_irq_restore(flags); - return 0; -} - -static int -rs_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - - local_irq_save(flags); - - if (clear & TIOCM_RTS) - e100_rts(info, 0); - if (clear & TIOCM_DTR) - e100_dtr(info, 0); - /* Handle FEMALE behaviour */ - if (clear & TIOCM_RI) - e100_ri_out(info, 0); - if (clear & TIOCM_CD) - e100_cd_out(info, 0); - - if (set & TIOCM_RTS) - e100_rts(info, 1); - if (set & TIOCM_DTR) - e100_dtr(info, 1); - /* Handle FEMALE behaviour */ - if (set & TIOCM_RI) - e100_ri_out(info, 1); - if (set & TIOCM_CD) - e100_cd_out(info, 1); - - local_irq_restore(flags); - return 0; -} - -static int -rs_tiocmget(struct tty_struct *tty) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned int result; - unsigned long flags; - - local_irq_save(flags); - - result = - (!E100_RTS_GET(info) ? TIOCM_RTS : 0) - | (!E100_DTR_GET(info) ? TIOCM_DTR : 0) - | (!E100_RI_GET(info) ? TIOCM_RNG : 0) - | (!E100_DSR_GET(info) ? TIOCM_DSR : 0) - | (!E100_CD_GET(info) ? TIOCM_CAR : 0) - | (!E100_CTS_GET(info) ? TIOCM_CTS : 0); - - local_irq_restore(flags); - -#ifdef SERIAL_DEBUG_IO - printk(KERN_DEBUG "ser%i: modem state: %i 0x%08X\n", - info->line, result, result); - { - char s[100]; - - get_control_state_str(result, s); - printk(KERN_DEBUG "state: %s\n", s); - } -#endif - return result; - -} - - -static int -rs_ioctl(struct tty_struct *tty, - unsigned int cmd, unsigned long arg) -{ - struct e100_serial * info = (struct e100_serial *)tty->driver_data; - - if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && - (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && - (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) { - if (tty_io_error(tty)) - return -EIO; - } - - switch (cmd) { - case TIOCGSERIAL: - return get_serial_info(info, - (struct serial_struct *) arg); - case TIOCSSERIAL: - return set_serial_info(info, - (struct serial_struct *) arg); - case TIOCSERGETLSR: /* Get line status register */ - return get_lsr_info(info, (unsigned int *) arg); - - case TIOCSERGSTRUCT: - if (copy_to_user((struct e100_serial *) arg, - info, sizeof(struct e100_serial))) - return -EFAULT; - return 0; - -#if defined(CONFIG_ETRAX_RS485) - case TIOCSERSETRS485: - { - /* In this ioctl we still use the old structure - * rs485_control for backward compatibility - * (if we use serial_rs485, then old user-level code - * wouldn't work anymore...). - * The use of this ioctl is deprecated: use TIOCSRS485 - * instead.*/ - struct rs485_control rs485ctrl; - struct serial_rs485 rs485data; - printk(KERN_DEBUG "The use of this ioctl is deprecated. Use TIOCSRS485 instead\n"); - if (copy_from_user(&rs485ctrl, (struct rs485_control *)arg, - sizeof(rs485ctrl))) - return -EFAULT; - - rs485data.delay_rts_before_send = rs485ctrl.delay_rts_before_send; - rs485data.flags = 0; - - if (rs485ctrl.enabled) - rs485data.flags |= SER_RS485_ENABLED; - else - rs485data.flags &= ~(SER_RS485_ENABLED); - - if (rs485ctrl.rts_on_send) - rs485data.flags |= SER_RS485_RTS_ON_SEND; - else - rs485data.flags &= ~(SER_RS485_RTS_ON_SEND); - - if (rs485ctrl.rts_after_sent) - rs485data.flags |= SER_RS485_RTS_AFTER_SEND; - else - rs485data.flags &= ~(SER_RS485_RTS_AFTER_SEND); - - return e100_enable_rs485(tty, &rs485data); - } - - case TIOCSRS485: - { - /* This is the new version of TIOCSRS485, with new - * data structure serial_rs485 */ - struct serial_rs485 rs485data; - if (copy_from_user(&rs485data, (struct rs485_control *)arg, - sizeof(rs485data))) - return -EFAULT; - - return e100_enable_rs485(tty, &rs485data); - } - - case TIOCGRS485: - { - struct serial_rs485 *rs485data = - &(((struct e100_serial *)tty->driver_data)->rs485); - /* This is the ioctl to get RS485 data from user-space */ - if (copy_to_user((struct serial_rs485 *) arg, - rs485data, - sizeof(struct serial_rs485))) - return -EFAULT; - break; - } - - case TIOCSERWRRS485: - { - struct rs485_write rs485wr; - if (copy_from_user(&rs485wr, (struct rs485_write *)arg, - sizeof(rs485wr))) - return -EFAULT; - - return e100_write_rs485(tty, rs485wr.outc, rs485wr.outc_size); - } -#endif - - default: - return -ENOIOCTLCMD; - } - return 0; -} - -static void -rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) -{ - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - - change_speed(info); - - /* Handle turning off CRTSCTS */ - if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) - rs_start(tty); - -} - -/* - * ------------------------------------------------------------ - * rs_close() - * - * This routine is called when the serial port gets closed. First, we - * wait for the last remaining data to be sent. Then, we unlink its - * S structure from the interrupt chain if necessary, and we free - * that IRQ if nothing is left in the chain. - * ------------------------------------------------------------ - */ -static void -rs_close(struct tty_struct *tty, struct file * filp) -{ - struct e100_serial * info = (struct e100_serial *)tty->driver_data; - unsigned long flags; - - if (!info) - return; - - /* interrupts are disabled for this entire function */ - - local_irq_save(flags); - - if (tty_hung_up_p(filp)) { - local_irq_restore(flags); - return; - } - -#ifdef SERIAL_DEBUG_OPEN - printk("[%d] rs_close ttyS%d, count = %d\n", current->pid, - info->line, info->count); -#endif - if ((tty->count == 1) && (info->port.count != 1)) { - /* - * Uh, oh. tty->count is 1, which means that the tty - * structure will be freed. Info->count should always - * be one in these conditions. If it's greater than - * one, we've got real problems, since it means the - * serial port won't be shutdown. - */ - printk(KERN_ERR - "rs_close: bad serial port count; tty->count is 1, " - "info->count is %d\n", info->port.count); - info->port.count = 1; - } - if (--info->port.count < 0) { - printk(KERN_ERR "rs_close: bad serial port count for ttyS%d: %d\n", - info->line, info->port.count); - info->port.count = 0; - } - if (info->port.count) { - local_irq_restore(flags); - return; - } - /* - * Now we wait for the transmit buffer to clear; and we notify - * the line discipline to only process XON/XOFF characters. - */ - tty->closing = 1; - if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) - tty_wait_until_sent(tty, info->port.closing_wait); - /* - * At this point we stop accepting input. To do this, we - * disable the serial receiver and the DMA receive interrupt. - */ -#ifdef SERIAL_HANDLE_EARLY_ERRORS - e100_disable_serial_data_irq(info); -#endif - - e100_disable_rx(info); - e100_disable_rx_irq(info); - - if (tty_port_initialized(&info->port)) { - /* - * Before we drop DTR, make sure the UART transmitter - * has completely drained; this is especially - * important as we have a transmit FIFO! - */ - rs_wait_until_sent(tty, HZ); - } - - shutdown(info); - rs_flush_buffer(tty); - tty_ldisc_flush(tty); - tty->closing = 0; - info->event = 0; - info->port.tty = NULL; - if (info->port.blocked_open) { - if (info->port.close_delay) - schedule_timeout_interruptible(info->port.close_delay); - wake_up_interruptible(&info->port.open_wait); - } - local_irq_restore(flags); - tty_port_set_active(&info->port, 0); - - /* port closed */ - -#if defined(CONFIG_ETRAX_RS485) - if (info->rs485.flags & SER_RS485_ENABLED) { - info->rs485.flags &= ~(SER_RS485_ENABLED); -#if defined(CONFIG_ETRAX_RS485_ON_PA) - *R_PORT_PA_DATA = port_pa_data_shadow &= ~(1 << rs485_pa_bit); -#endif - } -#endif - - /* - * Release any allocated DMA irq's. - */ - if (info->dma_in_enabled) { - free_irq(info->dma_in_irq_nbr, info); - cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); - info->uses_dma_in = 0; -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "DMA irq '%s' freed\n", - info->dma_in_irq_description); -#endif - } - if (info->dma_out_enabled) { - free_irq(info->dma_out_irq_nbr, info); - cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); - info->uses_dma_out = 0; -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "DMA irq '%s' freed\n", - info->dma_out_irq_description); -#endif - } -} - -/* - * rs_wait_until_sent() --- wait until the transmitter is empty - */ -static void rs_wait_until_sent(struct tty_struct *tty, int timeout) -{ - unsigned long orig_jiffies; - struct e100_serial *info = (struct e100_serial *)tty->driver_data; - unsigned long curr_time = jiffies; - unsigned long curr_time_usec = GET_JIFFIES_USEC(); - long elapsed_usec = - (curr_time - info->last_tx_active) * (1000000/HZ) + - curr_time_usec - info->last_tx_active_usec; - - /* - * Check R_DMA_CHx_STATUS bit 0-6=number of available bytes in FIFO - * R_DMA_CHx_HWSW bit 31-16=nbr of bytes left in DMA buffer (0=64k) - */ - orig_jiffies = jiffies; - while (info->xmit.head != info->xmit.tail || /* More in send queue */ - (*info->ostatusadr & 0x007f) || /* more in FIFO */ - (elapsed_usec < 2*info->char_time_usec)) { - schedule_timeout_interruptible(1); - if (signal_pending(current)) - break; - if (timeout && time_after(jiffies, orig_jiffies + timeout)) - break; - curr_time = jiffies; - curr_time_usec = GET_JIFFIES_USEC(); - elapsed_usec = - (curr_time - info->last_tx_active) * (1000000/HZ) + - curr_time_usec - info->last_tx_active_usec; - } - set_current_state(TASK_RUNNING); -} - -/* - * rs_hangup() --- called by tty_hangup() when a hangup is signaled. - */ -void -rs_hangup(struct tty_struct *tty) -{ - struct e100_serial * info = (struct e100_serial *)tty->driver_data; - - rs_flush_buffer(tty); - shutdown(info); - info->event = 0; - info->port.count = 0; - tty_port_set_active(&info->port, 0); - info->port.tty = NULL; - wake_up_interruptible(&info->port.open_wait); -} - -/* - * ------------------------------------------------------------ - * rs_open() and friends - * ------------------------------------------------------------ - */ -static int -block_til_ready(struct tty_struct *tty, struct file * filp, - struct e100_serial *info) -{ - DECLARE_WAITQUEUE(wait, current); - unsigned long flags; - int retval; - int do_clocal = 0; - - /* - * If non-blocking mode is set, or the port is not enabled, - * then make the check up front and then exit. - */ - if ((filp->f_flags & O_NONBLOCK) || tty_io_error(tty)) { - tty_port_set_active(&info->port, 1); - return 0; - } - - if (C_CLOCAL(tty)) - do_clocal = 1; - - /* - * Block waiting for the carrier detect and the line to become - * free (i.e., not in use by the callout). While we are in - * this loop, info->port.count is dropped by one, so that - * rs_close() knows when to free things. We restore it upon - * exit, either normal or abnormal. - */ - retval = 0; - add_wait_queue(&info->port.open_wait, &wait); -#ifdef SERIAL_DEBUG_OPEN - printk("block_til_ready before block: ttyS%d, count = %d\n", - info->line, info->port.count); -#endif - local_irq_save(flags); - info->port.count--; - local_irq_restore(flags); - info->port.blocked_open++; - while (1) { - local_irq_save(flags); - /* assert RTS and DTR */ - e100_rts(info, 1); - e100_dtr(info, 1); - local_irq_restore(flags); - set_current_state(TASK_INTERRUPTIBLE); - if (tty_hung_up_p(filp) || !tty_port_initialized(&info->port)) { -#ifdef SERIAL_DO_RESTART - if (info->port.flags & ASYNC_HUP_NOTIFY) - retval = -EAGAIN; - else - retval = -ERESTARTSYS; -#else - retval = -EAGAIN; -#endif - break; - } - if (do_clocal) - /* && (do_clocal || DCD_IS_ASSERTED) */ - break; - if (signal_pending(current)) { - retval = -ERESTARTSYS; - break; - } -#ifdef SERIAL_DEBUG_OPEN - printk("block_til_ready blocking: ttyS%d, count = %d\n", - info->line, info->port.count); -#endif - tty_unlock(tty); - schedule(); - tty_lock(tty); - } - set_current_state(TASK_RUNNING); - remove_wait_queue(&info->port.open_wait, &wait); - if (!tty_hung_up_p(filp)) - info->port.count++; - info->port.blocked_open--; -#ifdef SERIAL_DEBUG_OPEN - printk("block_til_ready after blocking: ttyS%d, count = %d\n", - info->line, info->port.count); -#endif - if (retval) - return retval; - tty_port_set_active(&info->port, 1); - return 0; -} - -static void -deinit_port(struct e100_serial *info) -{ - if (info->dma_out_enabled) { - cris_free_dma(info->dma_out_nbr, info->dma_out_irq_description); - free_irq(info->dma_out_irq_nbr, info); - } - if (info->dma_in_enabled) { - cris_free_dma(info->dma_in_nbr, info->dma_in_irq_description); - free_irq(info->dma_in_irq_nbr, info); - } -} - -/* - * This routine is called whenever a serial port is opened. - * It performs the serial-specific initialization for the tty structure. - */ -static int -rs_open(struct tty_struct *tty, struct file * filp) -{ - struct e100_serial *info; - int retval; - int allocated_resources = 0; - - info = rs_table + tty->index; - if (!info->enabled) - return -ENODEV; - -#ifdef SERIAL_DEBUG_OPEN - printk("[%d] rs_open %s, count = %d\n", current->pid, tty->name, - info->port.count); -#endif - - info->port.count++; - tty->driver_data = info; - info->port.tty = tty; - - info->port.low_latency = !!(info->port.flags & ASYNC_LOW_LATENCY); - - /* - * If DMA is enabled try to allocate the irq's. - */ - if (info->port.count == 1) { - allocated_resources = 1; - if (info->dma_in_enabled) { - if (request_irq(info->dma_in_irq_nbr, - rec_interrupt, - info->dma_in_irq_flags, - info->dma_in_irq_description, - info)) { - printk(KERN_WARNING "DMA irq '%s' busy; " - "falling back to non-DMA mode\n", - info->dma_in_irq_description); - /* Make sure we never try to use DMA in */ - /* for the port again. */ - info->dma_in_enabled = 0; - } else if (cris_request_dma(info->dma_in_nbr, - info->dma_in_irq_description, - DMA_VERBOSE_ON_ERROR, - info->dma_owner)) { - free_irq(info->dma_in_irq_nbr, info); - printk(KERN_WARNING "DMA '%s' busy; " - "falling back to non-DMA mode\n", - info->dma_in_irq_description); - /* Make sure we never try to use DMA in */ - /* for the port again. */ - info->dma_in_enabled = 0; - } -#ifdef SERIAL_DEBUG_OPEN - else - printk(KERN_DEBUG "DMA irq '%s' allocated\n", - info->dma_in_irq_description); -#endif - } - if (info->dma_out_enabled) { - if (request_irq(info->dma_out_irq_nbr, - tr_interrupt, - info->dma_out_irq_flags, - info->dma_out_irq_description, - info)) { - printk(KERN_WARNING "DMA irq '%s' busy; " - "falling back to non-DMA mode\n", - info->dma_out_irq_description); - /* Make sure we never try to use DMA out */ - /* for the port again. */ - info->dma_out_enabled = 0; - } else if (cris_request_dma(info->dma_out_nbr, - info->dma_out_irq_description, - DMA_VERBOSE_ON_ERROR, - info->dma_owner)) { - free_irq(info->dma_out_irq_nbr, info); - printk(KERN_WARNING "DMA '%s' busy; " - "falling back to non-DMA mode\n", - info->dma_out_irq_description); - /* Make sure we never try to use DMA out */ - /* for the port again. */ - info->dma_out_enabled = 0; - } -#ifdef SERIAL_DEBUG_OPEN - else - printk(KERN_DEBUG "DMA irq '%s' allocated\n", - info->dma_out_irq_description); -#endif - } - } - - /* - * Start up the serial port - */ - - retval = startup(info); - if (retval) { - if (allocated_resources) - deinit_port(info); - - /* FIXME Decrease count info->port.count here too? */ - return retval; - } - - - retval = block_til_ready(tty, filp, info); - if (retval) { -#ifdef SERIAL_DEBUG_OPEN - printk("rs_open returning after block_til_ready with %d\n", - retval); -#endif - if (allocated_resources) - deinit_port(info); - - return retval; - } - -#ifdef SERIAL_DEBUG_OPEN - printk("rs_open ttyS%d successful...\n", info->line); -#endif - DLOG_INT_TRIG( log_int_pos = 0); - - DFLIP( if (info->line == SERIAL_DEBUG_LINE) { - info->icount.rx = 0; - } ); - - return 0; -} - -#ifdef CONFIG_PROC_FS -/* - * /proc fs routines.... - */ - -static void seq_line_info(struct seq_file *m, struct e100_serial *info) -{ - unsigned long tmp; - - seq_printf(m, "%d: uart:E100 port:%lX irq:%d", - info->line, (unsigned long)info->ioport, info->irq); - - if (!info->ioport || (info->type == PORT_UNKNOWN)) { - seq_printf(m, "\n"); - return; - } - - seq_printf(m, " baud:%d", info->baud); - seq_printf(m, " tx:%lu rx:%lu", - (unsigned long)info->icount.tx, - (unsigned long)info->icount.rx); - tmp = CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); - if (tmp) - seq_printf(m, " tx_pend:%lu/%lu", - (unsigned long)tmp, - (unsigned long)SERIAL_XMIT_SIZE); - - seq_printf(m, " rx_pend:%lu/%lu", - (unsigned long)info->recv_cnt, - (unsigned long)info->max_recv_cnt); - -#if 1 - if (info->port.tty) { - if (info->port.tty->stopped) - seq_printf(m, " stopped:%i", - (int)info->port.tty->stopped); - } - - { - unsigned char rstat = info->ioport[REG_STATUS]; - if (rstat & IO_MASK(R_SERIAL0_STATUS, xoff_detect)) - seq_printf(m, " xoff_detect:1"); - } - -#endif - - if (info->icount.frame) - seq_printf(m, " fe:%lu", (unsigned long)info->icount.frame); - - if (info->icount.parity) - seq_printf(m, " pe:%lu", (unsigned long)info->icount.parity); - - if (info->icount.brk) - seq_printf(m, " brk:%lu", (unsigned long)info->icount.brk); - - if (info->icount.overrun) - seq_printf(m, " oe:%lu", (unsigned long)info->icount.overrun); - - /* - * Last thing is the RS-232 status lines - */ - if (!E100_RTS_GET(info)) - seq_puts(m, "|RTS"); - if (!E100_CTS_GET(info)) - seq_puts(m, "|CTS"); - if (!E100_DTR_GET(info)) - seq_puts(m, "|DTR"); - if (!E100_DSR_GET(info)) - seq_puts(m, "|DSR"); - if (!E100_CD_GET(info)) - seq_puts(m, "|CD"); - if (!E100_RI_GET(info)) - seq_puts(m, "|RI"); - seq_puts(m, "\n"); -} - - -static int crisv10_proc_show(struct seq_file *m, void *v) -{ - int i; - - seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); - - for (i = 0; i < NR_PORTS; i++) { - if (!rs_table[i].enabled) - continue; - seq_line_info(m, &rs_table[i]); - } -#ifdef DEBUG_LOG_INCLUDED - for (i = 0; i < debug_log_pos; i++) { - seq_printf(m, "%-4i %lu.%lu ", - i, debug_log[i].time, - timer_data_to_ns(debug_log[i].timer_data)); - seq_printf(m, debug_log[i].string, debug_log[i].value); - } - seq_printf(m, "debug_log %i/%i\n", i, DEBUG_LOG_SIZE); - debug_log_pos = 0; -#endif - return 0; -} - -static int crisv10_proc_open(struct inode *inode, struct file *file) -{ - return single_open(file, crisv10_proc_show, NULL); -} - -static const struct file_operations crisv10_proc_fops = { - .owner = THIS_MODULE, - .open = crisv10_proc_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; -#endif - - -/* Finally, routines used to initialize the serial driver. */ - -static void show_serial_version(void) -{ - printk(KERN_INFO - "ETRAX 100LX serial-driver %s, " - "(c) 2000-2004 Axis Communications AB\r\n", - &serial_version[11]); /* "$Revision: x.yy" */ -} - -/* rs_init inits the driver at boot (using the initcall chain) */ - -static const struct tty_operations rs_ops = { - .open = rs_open, - .close = rs_close, - .write = rs_write, - .flush_chars = rs_flush_chars, - .write_room = rs_write_room, - .chars_in_buffer = rs_chars_in_buffer, - .flush_buffer = rs_flush_buffer, - .ioctl = rs_ioctl, - .throttle = rs_throttle, - .unthrottle = rs_unthrottle, - .set_termios = rs_set_termios, - .stop = rs_stop, - .start = rs_start, - .hangup = rs_hangup, - .break_ctl = rs_break, - .send_xchar = rs_send_xchar, - .wait_until_sent = rs_wait_until_sent, - .tiocmget = rs_tiocmget, - .tiocmset = rs_tiocmset, -#ifdef CONFIG_PROC_FS - .proc_fops = &crisv10_proc_fops, -#endif -}; - -static int __init rs_init(void) -{ - int i; - struct e100_serial *info; - struct tty_driver *driver = alloc_tty_driver(NR_PORTS); - - if (!driver) - return -ENOMEM; - - show_serial_version(); - - /* Setup the timed flush handler system */ - -#if !defined(CONFIG_ETRAX_SERIAL_FAST_TIMER) - timer_setup(&flush_timer, timed_flush_handler, 0); - mod_timer(&flush_timer, jiffies + 5); -#endif - -#if defined(CONFIG_ETRAX_RS485) -#if defined(CONFIG_ETRAX_RS485_ON_PA) - if (cris_io_interface_allocate_pins(if_serial_0, 'a', rs485_pa_bit, - rs485_pa_bit)) { - printk(KERN_ERR "ETRAX100LX serial: Could not allocate " - "RS485 pin\n"); - put_tty_driver(driver); - return -EBUSY; - } -#endif -#endif - - /* Initialize the tty_driver structure */ - - driver->driver_name = "serial"; - driver->name = "ttyS"; - driver->major = TTY_MAJOR; - driver->minor_start = 64; - driver->type = TTY_DRIVER_TYPE_SERIAL; - driver->subtype = SERIAL_TYPE_NORMAL; - driver->init_termios = tty_std_termios; - driver->init_termios.c_cflag = - B115200 | CS8 | CREAD | HUPCL | CLOCAL; /* is normally B9600 default... */ - driver->init_termios.c_ispeed = 115200; - driver->init_termios.c_ospeed = 115200; - driver->flags = TTY_DRIVER_REAL_RAW; - - tty_set_operations(driver, &rs_ops); - serial_driver = driver; - - /* do some initializing for the separate ports */ - for (i = 0, info = rs_table; i < NR_PORTS; i++,info++) { - if (info->enabled) { - if (cris_request_io_interface(info->io_if, - info->io_if_description)) { - printk(KERN_ERR "ETRAX100LX async serial: " - "Could not allocate IO pins for " - "%s, port %d\n", - info->io_if_description, i); - info->enabled = 0; - } - } - tty_port_init(&info->port); - info->uses_dma_in = 0; - info->uses_dma_out = 0; - info->line = i; - info->port.tty = NULL; - info->type = PORT_ETRAX; - info->tr_running = 0; - info->forced_eop = 0; - info->baud_base = DEF_BAUD_BASE; - info->custom_divisor = 0; - info->x_char = 0; - info->event = 0; - info->xmit.buf = NULL; - info->xmit.tail = info->xmit.head = 0; - info->first_recv_buffer = info->last_recv_buffer = NULL; - info->recv_cnt = info->max_recv_cnt = 0; - info->last_tx_active_usec = 0; - info->last_tx_active = 0; - -#if defined(CONFIG_ETRAX_RS485) - /* Set sane defaults */ - info->rs485.flags &= ~(SER_RS485_RTS_ON_SEND); - info->rs485.flags |= SER_RS485_RTS_AFTER_SEND; - info->rs485.delay_rts_before_send = 0; - info->rs485.flags &= ~(SER_RS485_ENABLED); -#endif - INIT_WORK(&info->work, do_softint); - - if (info->enabled) { - printk(KERN_INFO "%s%d at %p is a builtin UART with DMA\n", - serial_driver->name, info->line, info->ioport); - } - tty_port_link_device(&info->port, driver, i); - } - - if (tty_register_driver(driver)) - panic("Couldn't register serial driver\n"); - -#ifdef CONFIG_ETRAX_FAST_TIMER -#ifdef CONFIG_ETRAX_SERIAL_FAST_TIMER - memset(fast_timers, 0, sizeof(fast_timers)); -#endif -#ifdef CONFIG_ETRAX_RS485 - memset(fast_timers_rs485, 0, sizeof(fast_timers_rs485)); -#endif - fast_timer_init(); -#endif - -#ifndef CONFIG_ETRAX_KGDB - /* Not needed in simulator. May only complicate stuff. */ - /* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */ - - if (request_irq(SERIAL_IRQ_NBR, ser_interrupt, - IRQF_SHARED, "serial ", driver)) - panic("%s: Failed to request irq8", __func__); - -#endif - - return 0; -} - -/* this makes sure that rs_init is called during kernel boot */ -device_initcall(rs_init); diff --git a/drivers/tty/serial/crisv10.h b/drivers/tty/serial/crisv10.h deleted file mode 100644 index 79ba2bc95d3d..000000000000 --- a/drivers/tty/serial/crisv10.h +++ /dev/null @@ -1,133 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * serial.h: Arch-dep definitions for the Etrax100 serial driver. - * - * Copyright (C) 1998-2007 Axis Communications AB - */ - -#ifndef _ETRAX_SERIAL_H -#define _ETRAX_SERIAL_H - -#include <linux/circ_buf.h> -#include <asm/termios.h> -#include <asm/dma.h> -#include <arch/io_interface_mux.h> - -/* Software state per channel */ - -#ifdef __KERNEL__ -/* - * This is our internal structure for each serial port's state. - * - * Many fields are paralleled by the structure used by the serial_struct - * structure. - * - * For definitions of the flags field, see tty.h - */ - -#define SERIAL_RECV_DESCRIPTORS 8 - -struct etrax_recv_buffer { - struct etrax_recv_buffer *next; - unsigned short length; - unsigned char error; - unsigned char pad; - - unsigned char buffer[0]; -}; - -struct e100_serial { - struct tty_port port; - int baud; - volatile u8 *ioport; /* R_SERIALx_CTRL */ - u32 irq; /* bitnr in R_IRQ_MASK2 for dmaX_descr */ - - /* Output registers */ - volatile u8 *oclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ - volatile u32 *ofirstadr; /* adr to R_DMA_CHx_FIRST */ - volatile u8 *ocmdadr; /* adr to R_DMA_CHx_CMD */ - const volatile u8 *ostatusadr; /* adr to R_DMA_CHx_STATUS */ - - /* Input registers */ - volatile u8 *iclrintradr; /* adr to R_DMA_CHx_CLR_INTR */ - volatile u32 *ifirstadr; /* adr to R_DMA_CHx_FIRST */ - volatile u8 *icmdadr; /* adr to R_DMA_CHx_CMD */ - volatile u32 *idescradr; /* adr to R_DMA_CHx_DESCR */ - - u8 rx_ctrl; /* shadow for R_SERIALx_REC_CTRL */ - u8 tx_ctrl; /* shadow for R_SERIALx_TR_CTRL */ - u8 iseteop; /* bit number for R_SET_EOP for the input dma */ - int enabled; /* Set to 1 if the port is enabled in HW config */ - - u8 dma_out_enabled; /* Set to 1 if DMA should be used */ - u8 dma_in_enabled; /* Set to 1 if DMA should be used */ - - /* end of fields defined in rs_table[] in .c-file */ - int dma_owner; - unsigned int dma_in_nbr; - unsigned int dma_out_nbr; - unsigned int dma_in_irq_nbr; - unsigned int dma_out_irq_nbr; - unsigned long dma_in_irq_flags; - unsigned long dma_out_irq_flags; - char *dma_in_irq_description; - char *dma_out_irq_description; - - enum cris_io_interface io_if; - char *io_if_description; - - u8 uses_dma_in; /* Set to 1 if DMA is used */ - u8 uses_dma_out; /* Set to 1 if DMA is used */ - u8 forced_eop; /* a fifo eop has been forced */ - int baud_base; /* For special baudrates */ - int custom_divisor; /* For special baudrates */ - struct etrax_dma_descr tr_descr; - struct etrax_dma_descr rec_descr[SERIAL_RECV_DESCRIPTORS]; - int cur_rec_descr; - - volatile int tr_running; /* 1 if output is running */ - - int x_char; /* xon/xoff character */ - unsigned long event; - int line; - int type; /* PORT_ETRAX */ - struct circ_buf xmit; - struct etrax_recv_buffer *first_recv_buffer; - struct etrax_recv_buffer *last_recv_buffer; - unsigned int recv_cnt; - unsigned int max_recv_cnt; - - struct work_struct work; - struct async_icount icount; /* error-statistics etc.*/ - - unsigned long char_time_usec; /* The time for 1 char, in usecs */ - unsigned long flush_time_usec; /* How often we should flush */ - unsigned long last_tx_active_usec; /* Last tx usec in the jiffies */ - unsigned long last_tx_active; /* Last tx time in jiffies */ - unsigned long last_rx_active_usec; /* Last rx usec in the jiffies */ - unsigned long last_rx_active; /* Last rx time in jiffies */ - - int break_detected_cnt; - int errorcode; - -#ifdef CONFIG_ETRAX_RS485 - struct serial_rs485 rs485; /* RS-485 support */ -#endif -}; - -/* this PORT is not in the standard serial.h. it's not actually used for - * anything since we only have one type of async serial-port anyway in this - * system. - */ - -#define PORT_ETRAX 1 - -/* - * Events are used to schedule things to happen at timer-interrupt - * time, instead of at rs interrupt time. - */ -#define RS_EVENT_WRITE_WAKEUP 0 - -#endif /* __KERNEL__ */ - -#endif /* !_ETRAX_SERIAL_H */ diff --git a/drivers/tty/serial/etraxfs-uart.c b/drivers/tty/serial/etraxfs-uart.c deleted file mode 100644 index 24bf6bfb29b4..000000000000 --- a/drivers/tty/serial/etraxfs-uart.c +++ /dev/null @@ -1,960 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#include <linux/module.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/platform_device.h> -#include <linux/serial_core.h> -#include <linux/tty_flip.h> -#include <linux/of.h> -#include <linux/gpio.h> -#include <linux/of_irq.h> -#include <linux/of_address.h> -#include <hwregs/ser_defs.h> - -#include "serial_mctrl_gpio.h" - -#define DRV_NAME "etraxfs-uart" -#define UART_NR CONFIG_ETRAX_SERIAL_PORTS - -#define MODIFY_REG(instance, reg, var) \ - do { \ - if (REG_RD_INT(ser, instance, reg) != \ - REG_TYPE_CONV(int, reg_ser_##reg, var)) \ - REG_WR(ser, instance, reg, var); \ - } while (0) - -struct uart_cris_port { - struct uart_port port; - - int initialized; - int irq; - - void __iomem *regi_ser; - - struct mctrl_gpios *gpios; - - int write_ongoing; -}; - -static struct uart_driver etraxfs_uart_driver; -static struct uart_port *console_port; -static int console_baud = 115200; -static struct uart_cris_port *etraxfs_uart_ports[UART_NR]; - -static void cris_serial_port_init(struct uart_port *port, int line); -static void etraxfs_uart_stop_rx(struct uart_port *port); -static inline void etraxfs_uart_start_tx_bottom(struct uart_port *port); - -#ifdef CONFIG_SERIAL_ETRAXFS_CONSOLE -static void -cris_console_write(struct console *co, const char *s, unsigned int count) -{ - struct uart_cris_port *up; - int i; - reg_ser_r_stat_din stat; - reg_ser_rw_tr_dma_en tr_dma_en, old; - - up = etraxfs_uart_ports[co->index]; - - if (!up) - return; - - /* Switch to manual mode. */ - tr_dma_en = old = REG_RD(ser, up->regi_ser, rw_tr_dma_en); - if (tr_dma_en.en == regk_ser_yes) { - tr_dma_en.en = regk_ser_no; - REG_WR(ser, up->regi_ser, rw_tr_dma_en, tr_dma_en); - } - - /* Send data. */ - for (i = 0; i < count; i++) { - /* LF -> CRLF */ - if (s[i] == '\n') { - do { - stat = REG_RD(ser, up->regi_ser, r_stat_din); - } while (!stat.tr_rdy); - REG_WR_INT(ser, up->regi_ser, rw_dout, '\r'); - } - /* Wait until transmitter is ready and send. */ - do { - stat = REG_RD(ser, up->regi_ser, r_stat_din); - } while (!stat.tr_rdy); - REG_WR_INT(ser, up->regi_ser, rw_dout, s[i]); - } - - /* Restore mode. */ - if (tr_dma_en.en != old.en) - REG_WR(ser, up->regi_ser, rw_tr_dma_en, old); -} - -static int __init -cris_console_setup(struct console *co, char *options) -{ - struct uart_port *port; - int baud = 115200; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (co->index < 0 || co->index >= UART_NR) - co->index = 0; - port = &etraxfs_uart_ports[co->index]->port; - console_port = port; - - co->flags |= CON_CONSDEV; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - console_baud = baud; - cris_serial_port_init(port, co->index); - uart_set_options(port, co, baud, parity, bits, flow); - - return 0; -} - -static struct console cris_console = { - .name = "ttyS", - .write = cris_console_write, - .device = uart_console_device, - .setup = cris_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &etraxfs_uart_driver, -}; -#endif /* CONFIG_SERIAL_ETRAXFS_CONSOLE */ - -static struct uart_driver etraxfs_uart_driver = { - .owner = THIS_MODULE, - .driver_name = "serial", - .dev_name = "ttyS", - .major = TTY_MAJOR, - .minor = 64, - .nr = UART_NR, -#ifdef CONFIG_SERIAL_ETRAXFS_CONSOLE - .cons = &cris_console, -#endif /* CONFIG_SERIAL_ETRAXFS_CONSOLE */ -}; - -static inline int crisv32_serial_get_rts(struct uart_cris_port *up) -{ - void __iomem *regi_ser = up->regi_ser; - /* - * Return what the user has controlled rts to or - * what the pin is? (if auto_rts is used it differs during tx) - */ - reg_ser_r_stat_din rstat = REG_RD(ser, regi_ser, r_stat_din); - - return !(rstat.rts_n == regk_ser_active); -} - -/* - * A set = 0 means 3.3V on the pin, bitvalue: 0=active, 1=inactive - * 0=0V , 1=3.3V - */ -static inline void crisv32_serial_set_rts(struct uart_cris_port *up, - int set, int force) -{ - void __iomem *regi_ser = up->regi_ser; - - unsigned long flags; - reg_ser_rw_rec_ctrl rec_ctrl; - - local_irq_save(flags); - rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl); - - if (set) - rec_ctrl.rts_n = regk_ser_active; - else - rec_ctrl.rts_n = regk_ser_inactive; - REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl); - local_irq_restore(flags); -} - -static inline int crisv32_serial_get_cts(struct uart_cris_port *up) -{ - void __iomem *regi_ser = up->regi_ser; - reg_ser_r_stat_din rstat = REG_RD(ser, regi_ser, r_stat_din); - - return (rstat.cts_n == regk_ser_active); -} - -/* - * Send a single character for XON/XOFF purposes. We do it in this separate - * function instead of the alternative support port.x_char, in the ...start_tx - * function, so we don't mix up this case with possibly enabling transmission - * of queued-up data (in case that's disabled after *receiving* an XOFF or - * negative CTS). This function is used for both DMA and non-DMA case; see HW - * docs specifically blessing sending characters manually when DMA for - * transmission is enabled and running. We may be asked to transmit despite - * the transmitter being disabled by a ..._stop_tx call so we need to enable - * it temporarily but restore the state afterwards. - */ -static void etraxfs_uart_send_xchar(struct uart_port *port, char ch) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - reg_ser_rw_dout dout = { .data = ch }; - reg_ser_rw_ack_intr ack_intr = { .tr_rdy = regk_ser_yes }; - reg_ser_r_stat_din rstat; - reg_ser_rw_tr_ctrl prev_tr_ctrl, tr_ctrl; - void __iomem *regi_ser = up->regi_ser; - unsigned long flags; - - /* - * Wait for tr_rdy in case a character is already being output. Make - * sure we have integrity between the register reads and the writes - * below, but don't busy-wait with interrupts off and the port lock - * taken. - */ - spin_lock_irqsave(&port->lock, flags); - do { - spin_unlock_irqrestore(&port->lock, flags); - spin_lock_irqsave(&port->lock, flags); - prev_tr_ctrl = tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl); - rstat = REG_RD(ser, regi_ser, r_stat_din); - } while (!rstat.tr_rdy); - - /* - * Ack an interrupt if one was just issued for the previous character - * that was output. This is required for non-DMA as the interrupt is - * used as the only indicator that the transmitter is ready and it - * isn't while this x_char is being transmitted. - */ - REG_WR(ser, regi_ser, rw_ack_intr, ack_intr); - - /* Enable the transmitter in case it was disabled. */ - tr_ctrl.stop = 0; - REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl); - - /* - * Finally, send the blessed character; nothing should stop it now, - * except for an xoff-detected state, which we'll handle below. - */ - REG_WR(ser, regi_ser, rw_dout, dout); - up->port.icount.tx++; - - /* There might be an xoff state to clear. */ - rstat = REG_RD(ser, up->regi_ser, r_stat_din); - - /* - * Clear any xoff state that *may* have been there to - * inhibit transmission of the character. - */ - if (rstat.xoff_detect) { - reg_ser_rw_xoff_clr xoff_clr = { .clr = 1 }; - reg_ser_rw_tr_dma_en tr_dma_en; - - REG_WR(ser, regi_ser, rw_xoff_clr, xoff_clr); - tr_dma_en = REG_RD(ser, regi_ser, rw_tr_dma_en); - - /* - * If we had an xoff state but cleared it, instead sneak in a - * disabled state for the transmitter, after the character we - * sent. Thus we keep the port disabled, just as if the xoff - * state was still in effect (or actually, as if stop_tx had - * been called, as we stop DMA too). - */ - prev_tr_ctrl.stop = 1; - - tr_dma_en.en = 0; - REG_WR(ser, regi_ser, rw_tr_dma_en, tr_dma_en); - } - - /* Restore "previous" enabled/disabled state of the transmitter. */ - REG_WR(ser, regi_ser, rw_tr_ctrl, prev_tr_ctrl); - - spin_unlock_irqrestore(&port->lock, flags); -} - -/* - * Do not spin_lock_irqsave or disable interrupts by other means here; it's - * already done by the caller. - */ -static void etraxfs_uart_start_tx(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - - /* we have already done below if a write is ongoing */ - if (up->write_ongoing) - return; - - /* Signal that write is ongoing */ - up->write_ongoing = 1; - - etraxfs_uart_start_tx_bottom(port); -} - -static inline void etraxfs_uart_start_tx_bottom(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - void __iomem *regi_ser = up->regi_ser; - reg_ser_rw_tr_ctrl tr_ctrl; - reg_ser_rw_intr_mask intr_mask; - - tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl); - tr_ctrl.stop = regk_ser_no; - REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl); - intr_mask = REG_RD(ser, regi_ser, rw_intr_mask); - intr_mask.tr_rdy = regk_ser_yes; - REG_WR(ser, regi_ser, rw_intr_mask, intr_mask); -} - -/* - * This function handles both the DMA and non-DMA case by ordering the - * transmitter to stop of after the current character. We don't need to wait - * for any such character to be completely transmitted; we do that where it - * matters, like in etraxfs_uart_set_termios. Don't busy-wait here; see - * Documentation/serial/driver: this function is called within - * spin_lock_irq{,save} and thus separate ones would be disastrous (when SMP). - * There's no documented need to set the txd pin to any particular value; - * break setting is controlled solely by etraxfs_uart_break_ctl. - */ -static void etraxfs_uart_stop_tx(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - void __iomem *regi_ser = up->regi_ser; - reg_ser_rw_tr_ctrl tr_ctrl; - reg_ser_rw_intr_mask intr_mask; - reg_ser_rw_tr_dma_en tr_dma_en = {0}; - reg_ser_rw_xoff_clr xoff_clr = {0}; - - /* - * For the non-DMA case, we'd get a tr_rdy interrupt that we're not - * interested in as we're not transmitting any characters. For the - * DMA case, that interrupt is already turned off, but no reason to - * waste code on conditionals here. - */ - intr_mask = REG_RD(ser, regi_ser, rw_intr_mask); - intr_mask.tr_rdy = regk_ser_no; - REG_WR(ser, regi_ser, rw_intr_mask, intr_mask); - - tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl); - tr_ctrl.stop = 1; - REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl); - - /* - * Always clear possible hardware xoff-detected state here, no need to - * unnecessary consider mctrl settings and when they change. We clear - * it here rather than in start_tx: both functions are called as the - * effect of XOFF processing, but start_tx is also called when upper - * levels tell the driver that there are more characters to send, so - * avoid adding code there. - */ - xoff_clr.clr = 1; - REG_WR(ser, regi_ser, rw_xoff_clr, xoff_clr); - - /* - * Disable transmitter DMA, so that if we're in XON/XOFF, we can send - * those single characters without also giving go-ahead for queued up - * DMA data. - */ - tr_dma_en.en = 0; - REG_WR(ser, regi_ser, rw_tr_dma_en, tr_dma_en); - - /* - * Make sure that write_ongoing is reset when stopping tx. - */ - up->write_ongoing = 0; -} - -static void etraxfs_uart_stop_rx(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - void __iomem *regi_ser = up->regi_ser; - reg_ser_rw_rec_ctrl rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl); - - rec_ctrl.en = regk_ser_no; - REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl); -} - -static unsigned int etraxfs_uart_tx_empty(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - unsigned long flags; - unsigned int ret; - reg_ser_r_stat_din rstat = {0}; - - spin_lock_irqsave(&up->port.lock, flags); - - rstat = REG_RD(ser, up->regi_ser, r_stat_din); - ret = rstat.tr_empty ? TIOCSER_TEMT : 0; - - spin_unlock_irqrestore(&up->port.lock, flags); - return ret; -} -static unsigned int etraxfs_uart_get_mctrl(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - unsigned int ret; - - ret = 0; - if (crisv32_serial_get_rts(up)) - ret |= TIOCM_RTS; - if (crisv32_serial_get_cts(up)) - ret |= TIOCM_CTS; - return mctrl_gpio_get(up->gpios, &ret); -} - -static void etraxfs_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - - crisv32_serial_set_rts(up, mctrl & TIOCM_RTS ? 1 : 0, 0); - mctrl_gpio_set(up->gpios, mctrl); -} - -static void etraxfs_uart_break_ctl(struct uart_port *port, int break_state) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - unsigned long flags; - reg_ser_rw_tr_ctrl tr_ctrl; - reg_ser_rw_tr_dma_en tr_dma_en; - reg_ser_rw_intr_mask intr_mask; - - spin_lock_irqsave(&up->port.lock, flags); - tr_ctrl = REG_RD(ser, up->regi_ser, rw_tr_ctrl); - tr_dma_en = REG_RD(ser, up->regi_ser, rw_tr_dma_en); - intr_mask = REG_RD(ser, up->regi_ser, rw_intr_mask); - - if (break_state != 0) { /* Send break */ - /* - * We need to disable DMA (if used) or tr_rdy interrupts if no - * DMA. No need to make this conditional on use of DMA; - * disabling will be a no-op for the other mode. - */ - intr_mask.tr_rdy = regk_ser_no; - tr_dma_en.en = 0; - - /* - * Stop transmission and set the txd pin to 0 after the - * current character. The txd setting will take effect after - * any current transmission has completed. - */ - tr_ctrl.stop = 1; - tr_ctrl.txd = 0; - } else { - /* Re-enable the serial interrupt. */ - intr_mask.tr_rdy = regk_ser_yes; - - tr_ctrl.stop = 0; - tr_ctrl.txd = 1; - } - REG_WR(ser, up->regi_ser, rw_tr_ctrl, tr_ctrl); - REG_WR(ser, up->regi_ser, rw_tr_dma_en, tr_dma_en); - REG_WR(ser, up->regi_ser, rw_intr_mask, intr_mask); - - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static void -transmit_chars_no_dma(struct uart_cris_port *up) -{ - int max_count; - struct circ_buf *xmit = &up->port.state->xmit; - - void __iomem *regi_ser = up->regi_ser; - reg_ser_r_stat_din rstat; - reg_ser_rw_ack_intr ack_intr = { .tr_rdy = regk_ser_yes }; - - if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { - /* No more to send, so disable the interrupt. */ - reg_ser_rw_intr_mask intr_mask; - - intr_mask = REG_RD(ser, regi_ser, rw_intr_mask); - intr_mask.tr_rdy = 0; - intr_mask.tr_empty = 0; - REG_WR(ser, regi_ser, rw_intr_mask, intr_mask); - up->write_ongoing = 0; - return; - } - - /* If the serport is fast, we send up to max_count bytes before - exiting the loop. */ - max_count = 64; - do { - reg_ser_rw_dout dout = { .data = xmit->buf[xmit->tail] }; - - REG_WR(ser, regi_ser, rw_dout, dout); - REG_WR(ser, regi_ser, rw_ack_intr, ack_intr); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1); - up->port.icount.tx++; - if (xmit->head == xmit->tail) - break; - rstat = REG_RD(ser, regi_ser, r_stat_din); - } while ((--max_count > 0) && rstat.tr_rdy); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&up->port); -} - -static void receive_chars_no_dma(struct uart_cris_port *up) -{ - reg_ser_rs_stat_din stat_din; - reg_ser_r_stat_din rstat; - struct tty_port *port; - struct uart_icount *icount; - int max_count = 16; - char flag; - reg_ser_rw_ack_intr ack_intr = { 0 }; - - rstat = REG_RD(ser, up->regi_ser, r_stat_din); - icount = &up->port.icount; - port = &up->port.state->port; - - do { - stat_din = REG_RD(ser, up->regi_ser, rs_stat_din); - - flag = TTY_NORMAL; - ack_intr.dav = 1; - REG_WR(ser, up->regi_ser, rw_ack_intr, ack_intr); - icount->rx++; - - if (stat_din.framing_err | stat_din.par_err | stat_din.orun) { - if (stat_din.data == 0x00 && - stat_din.framing_err) { - /* Most likely a break. */ - flag = TTY_BREAK; - icount->brk++; - } else if (stat_din.par_err) { - flag = TTY_PARITY; - icount->parity++; - } else if (stat_din.orun) { - flag = TTY_OVERRUN; - icount->overrun++; - } else if (stat_din.framing_err) { - flag = TTY_FRAME; - icount->frame++; - } - } - - /* - * If this becomes important, we probably *could* handle this - * gracefully by keeping track of the unhandled character. - */ - if (!tty_insert_flip_char(port, stat_din.data, flag)) - panic("%s: No tty buffer space", __func__); - rstat = REG_RD(ser, up->regi_ser, r_stat_din); - } while (rstat.dav && (max_count-- > 0)); - spin_unlock(&up->port.lock); - tty_flip_buffer_push(port); - spin_lock(&up->port.lock); -} - -static irqreturn_t -ser_interrupt(int irq, void *dev_id) -{ - struct uart_cris_port *up = (struct uart_cris_port *)dev_id; - void __iomem *regi_ser; - int handled = 0; - - spin_lock(&up->port.lock); - - regi_ser = up->regi_ser; - - if (regi_ser) { - reg_ser_r_masked_intr masked_intr; - - masked_intr = REG_RD(ser, regi_ser, r_masked_intr); - /* - * Check what interrupts are active before taking - * actions. If DMA is used the interrupt shouldn't - * be enabled. - */ - if (masked_intr.dav) { - receive_chars_no_dma(up); - handled = 1; - } - - if (masked_intr.tr_rdy) { - transmit_chars_no_dma(up); - handled = 1; - } - } - spin_unlock(&up->port.lock); - return IRQ_RETVAL(handled); -} - -#ifdef CONFIG_CONSOLE_POLL -static int etraxfs_uart_get_poll_char(struct uart_port *port) -{ - reg_ser_rs_stat_din stat; - reg_ser_rw_ack_intr ack_intr = { 0 }; - struct uart_cris_port *up = (struct uart_cris_port *)port; - - do { - stat = REG_RD(ser, up->regi_ser, rs_stat_din); - } while (!stat.dav); - - /* Ack the data_avail interrupt. */ - ack_intr.dav = 1; - REG_WR(ser, up->regi_ser, rw_ack_intr, ack_intr); - - return stat.data; -} - -static void etraxfs_uart_put_poll_char(struct uart_port *port, - unsigned char c) -{ - reg_ser_r_stat_din stat; - struct uart_cris_port *up = (struct uart_cris_port *)port; - - do { - stat = REG_RD(ser, up->regi_ser, r_stat_din); - } while (!stat.tr_rdy); - REG_WR_INT(ser, up->regi_ser, rw_dout, c); -} -#endif /* CONFIG_CONSOLE_POLL */ - -static int etraxfs_uart_startup(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - unsigned long flags; - reg_ser_rw_intr_mask ser_intr_mask = {0}; - - ser_intr_mask.dav = regk_ser_yes; - - if (request_irq(etraxfs_uart_ports[port->line]->irq, ser_interrupt, - 0, DRV_NAME, etraxfs_uart_ports[port->line])) - panic("irq ser%d", port->line); - - spin_lock_irqsave(&up->port.lock, flags); - - REG_WR(ser, up->regi_ser, rw_intr_mask, ser_intr_mask); - - etraxfs_uart_set_mctrl(&up->port, up->port.mctrl); - - spin_unlock_irqrestore(&up->port.lock, flags); - - return 0; -} - -static void etraxfs_uart_shutdown(struct uart_port *port) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - unsigned long flags; - - spin_lock_irqsave(&up->port.lock, flags); - - etraxfs_uart_stop_tx(port); - etraxfs_uart_stop_rx(port); - - free_irq(etraxfs_uart_ports[port->line]->irq, - etraxfs_uart_ports[port->line]); - - etraxfs_uart_set_mctrl(&up->port, up->port.mctrl); - - spin_unlock_irqrestore(&up->port.lock, flags); - -} - -static void -etraxfs_uart_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - unsigned long flags; - reg_ser_rw_xoff xoff; - reg_ser_rw_xoff_clr xoff_clr = {0}; - reg_ser_rw_tr_ctrl tx_ctrl = {0}; - reg_ser_rw_tr_dma_en tx_dma_en = {0}; - reg_ser_rw_rec_ctrl rx_ctrl = {0}; - reg_ser_rw_tr_baud_div tx_baud_div = {0}; - reg_ser_rw_rec_baud_div rx_baud_div = {0}; - int baud; - - if (old && - termios->c_cflag == old->c_cflag && - termios->c_iflag == old->c_iflag) - return; - - /* Tx: 8 bit, no/even parity, 1 stop bit, no cts. */ - tx_ctrl.base_freq = regk_ser_f29_493; - tx_ctrl.en = 0; - tx_ctrl.stop = 0; - tx_ctrl.auto_rts = regk_ser_no; - tx_ctrl.txd = 1; - tx_ctrl.auto_cts = 0; - /* Rx: 8 bit, no/even parity. */ - rx_ctrl.dma_err = regk_ser_stop; - rx_ctrl.sampling = regk_ser_majority; - rx_ctrl.timeout = 1; - - rx_ctrl.rts_n = regk_ser_inactive; - - /* Common for tx and rx: 8N1. */ - tx_ctrl.data_bits = regk_ser_bits8; - rx_ctrl.data_bits = regk_ser_bits8; - tx_ctrl.par = regk_ser_even; - rx_ctrl.par = regk_ser_even; - tx_ctrl.par_en = regk_ser_no; - rx_ctrl.par_en = regk_ser_no; - - tx_ctrl.stop_bits = regk_ser_bits1; - - /* - * Change baud-rate and write it to the hardware. - * - * baud_clock = base_freq / (divisor*8) - * divisor = base_freq / (baud_clock * 8) - * base_freq is either: - * off, ext, 29.493MHz, 32.000 MHz, 32.768 MHz or 100 MHz - * 20.493MHz is used for standard baudrates - */ - - /* - * For the console port we keep the original baudrate here. Not very - * beautiful. - */ - if ((port != console_port) || old) - baud = uart_get_baud_rate(port, termios, old, 0, - port->uartclk / 8); - else - baud = console_baud; - - tx_baud_div.div = 29493000 / (8 * baud); - /* Rx uses same as tx. */ - rx_baud_div.div = tx_baud_div.div; - rx_ctrl.base_freq = tx_ctrl.base_freq; - - if ((termios->c_cflag & CSIZE) == CS7) { - /* Set 7 bit mode. */ - tx_ctrl.data_bits = regk_ser_bits7; - rx_ctrl.data_bits = regk_ser_bits7; - } - - if (termios->c_cflag & CSTOPB) { - /* Set 2 stop bit mode. */ - tx_ctrl.stop_bits = regk_ser_bits2; - } - - if (termios->c_cflag & PARENB) { - /* Enable parity. */ - tx_ctrl.par_en = regk_ser_yes; - rx_ctrl.par_en = regk_ser_yes; - } - - if (termios->c_cflag & CMSPAR) { - if (termios->c_cflag & PARODD) { - /* Set mark parity if PARODD and CMSPAR. */ - tx_ctrl.par = regk_ser_mark; - rx_ctrl.par = regk_ser_mark; - } else { - tx_ctrl.par = regk_ser_space; - rx_ctrl.par = regk_ser_space; - } - } else { - if (termios->c_cflag & PARODD) { - /* Set odd parity. */ - tx_ctrl.par = regk_ser_odd; - rx_ctrl.par = regk_ser_odd; - } - } - - if (termios->c_cflag & CRTSCTS) { - /* Enable automatic CTS handling. */ - tx_ctrl.auto_cts = regk_ser_yes; - } - - /* Make sure the tx and rx are enabled. */ - tx_ctrl.en = regk_ser_yes; - rx_ctrl.en = regk_ser_yes; - - spin_lock_irqsave(&port->lock, flags); - - tx_dma_en.en = 0; - REG_WR(ser, up->regi_ser, rw_tr_dma_en, tx_dma_en); - - /* Actually write the control regs (if modified) to the hardware. */ - uart_update_timeout(port, termios->c_cflag, port->uartclk/8); - MODIFY_REG(up->regi_ser, rw_rec_baud_div, rx_baud_div); - MODIFY_REG(up->regi_ser, rw_rec_ctrl, rx_ctrl); - - MODIFY_REG(up->regi_ser, rw_tr_baud_div, tx_baud_div); - MODIFY_REG(up->regi_ser, rw_tr_ctrl, tx_ctrl); - - tx_dma_en.en = 0; - REG_WR(ser, up->regi_ser, rw_tr_dma_en, tx_dma_en); - - xoff = REG_RD(ser, up->regi_ser, rw_xoff); - - if (up->port.state && up->port.state->port.tty && - (up->port.state->port.tty->termios.c_iflag & IXON)) { - xoff.chr = STOP_CHAR(up->port.state->port.tty); - xoff.automatic = regk_ser_yes; - } else - xoff.automatic = regk_ser_no; - - MODIFY_REG(up->regi_ser, rw_xoff, xoff); - - /* - * Make sure we don't start in an automatically shut-off state due to - * a previous early exit. - */ - xoff_clr.clr = 1; - REG_WR(ser, up->regi_ser, rw_xoff_clr, xoff_clr); - - etraxfs_uart_set_mctrl(&up->port, up->port.mctrl); - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static const char * -etraxfs_uart_type(struct uart_port *port) -{ - return "CRISv32"; -} - -static void etraxfs_uart_release_port(struct uart_port *port) -{ -} - -static int etraxfs_uart_request_port(struct uart_port *port) -{ - return 0; -} - -static void etraxfs_uart_config_port(struct uart_port *port, int flags) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - - up->port.type = PORT_CRIS; -} - -static const struct uart_ops etraxfs_uart_pops = { - .tx_empty = etraxfs_uart_tx_empty, - .set_mctrl = etraxfs_uart_set_mctrl, - .get_mctrl = etraxfs_uart_get_mctrl, - .stop_tx = etraxfs_uart_stop_tx, - .start_tx = etraxfs_uart_start_tx, - .send_xchar = etraxfs_uart_send_xchar, - .stop_rx = etraxfs_uart_stop_rx, - .break_ctl = etraxfs_uart_break_ctl, - .startup = etraxfs_uart_startup, - .shutdown = etraxfs_uart_shutdown, - .set_termios = etraxfs_uart_set_termios, - .type = etraxfs_uart_type, - .release_port = etraxfs_uart_release_port, - .request_port = etraxfs_uart_request_port, - .config_port = etraxfs_uart_config_port, -#ifdef CONFIG_CONSOLE_POLL - .poll_get_char = etraxfs_uart_get_poll_char, - .poll_put_char = etraxfs_uart_put_poll_char, -#endif -}; - -static void cris_serial_port_init(struct uart_port *port, int line) -{ - struct uart_cris_port *up = (struct uart_cris_port *)port; - - if (up->initialized) - return; - up->initialized = 1; - port->line = line; - spin_lock_init(&port->lock); - port->ops = &etraxfs_uart_pops; - port->irq = up->irq; - port->iobase = (unsigned long) up->regi_ser; - port->uartclk = 29493000; - - /* - * We can't fit any more than 255 here (unsigned char), though - * actually UART_XMIT_SIZE characters could be pending output. - * At time of this writing, the definition of "fifosize" is here the - * amount of characters that can be pending output after a start_tx call - * until tx_empty returns 1: see serial_core.c:uart_wait_until_sent. - * This matters for timeout calculations unfortunately, but keeping - * larger amounts at the DMA wouldn't win much so let's just play nice. - */ - port->fifosize = 255; - port->flags = UPF_BOOT_AUTOCONF; -} - -static int etraxfs_uart_probe(struct platform_device *pdev) -{ - struct device_node *np = pdev->dev.of_node; - struct uart_cris_port *up; - int dev_id; - - if (!np) - return -ENODEV; - - dev_id = of_alias_get_id(np, "serial"); - if (dev_id < 0) - dev_id = 0; - - if (dev_id >= UART_NR) - return -EINVAL; - - if (etraxfs_uart_ports[dev_id]) - return -EBUSY; - - up = devm_kzalloc(&pdev->dev, sizeof(struct uart_cris_port), - GFP_KERNEL); - if (!up) - return -ENOMEM; - - up->irq = irq_of_parse_and_map(np, 0); - up->regi_ser = of_iomap(np, 0); - up->port.dev = &pdev->dev; - - up->gpios = mctrl_gpio_init_noauto(&pdev->dev, 0); - if (IS_ERR(up->gpios)) - return PTR_ERR(up->gpios); - - cris_serial_port_init(&up->port, dev_id); - - etraxfs_uart_ports[dev_id] = up; - platform_set_drvdata(pdev, &up->port); - uart_add_one_port(&etraxfs_uart_driver, &up->port); - - return 0; -} - -static int etraxfs_uart_remove(struct platform_device *pdev) -{ - struct uart_port *port; - - port = platform_get_drvdata(pdev); - uart_remove_one_port(&etraxfs_uart_driver, port); - etraxfs_uart_ports[port->line] = NULL; - - return 0; -} - -static const struct of_device_id etraxfs_uart_dt_ids[] = { - { .compatible = "axis,etraxfs-uart" }, - { /* sentinel */ } -}; - -MODULE_DEVICE_TABLE(of, etraxfs_uart_dt_ids); - -static struct platform_driver etraxfs_uart_platform_driver = { - .driver = { - .name = DRV_NAME, - .of_match_table = of_match_ptr(etraxfs_uart_dt_ids), - }, - .probe = etraxfs_uart_probe, - .remove = etraxfs_uart_remove, -}; - -static int __init etraxfs_uart_init(void) -{ - int ret; - - ret = uart_register_driver(&etraxfs_uart_driver); - if (ret) - return ret; - - ret = platform_driver_register(&etraxfs_uart_platform_driver); - if (ret) - uart_unregister_driver(&etraxfs_uart_driver); - - return ret; -} - -static void __exit etraxfs_uart_exit(void) -{ - platform_driver_unregister(&etraxfs_uart_platform_driver); - uart_unregister_driver(&etraxfs_uart_driver); -} - -module_init(etraxfs_uart_init); -module_exit(etraxfs_uart_exit); |