diff options
Diffstat (limited to 'arch/mn10300/kernel/mn10300-serial.c')
| -rw-r--r-- | arch/mn10300/kernel/mn10300-serial.c | 1790 |
1 files changed, 0 insertions, 1790 deletions
diff --git a/arch/mn10300/kernel/mn10300-serial.c b/arch/mn10300/kernel/mn10300-serial.c deleted file mode 100644 index 4994b570dfd9..000000000000 --- a/arch/mn10300/kernel/mn10300-serial.c +++ /dev/null @@ -1,1790 +0,0 @@ -/* MN10300 On-chip serial port UART driver - * - * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public Licence - * as published by the Free Software Foundation; either version - * 2 of the Licence, or (at your option) any later version. - */ - -static const char serial_name[] = "MN10300 Serial driver"; -static const char serial_version[] = "mn10300_serial-1.0"; -static const char serial_revdate[] = "2007-11-06"; - -#if defined(CONFIG_MN10300_TTYSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include <linux/module.h> -#include <linux/serial.h> -#include <linux/circ_buf.h> -#include <linux/errno.h> -#include <linux/signal.h> -#include <linux/sched.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/ioport.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/console.h> -#include <linux/sysrq.h> - -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/bitops.h> -#include <asm/serial-regs.h> -#include <unit/timex.h> -#include "mn10300-serial.h" - -#ifdef CONFIG_SMP -#undef GxICR -#define GxICR(X) CROSS_GxICR(X, 0) -#endif /* CONFIG_SMP */ - -#define kenter(FMT, ...) \ - printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__) -#define _enter(FMT, ...) \ - no_printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__) -#define kdebug(FMT, ...) \ - printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__) -#define _debug(FMT, ...) \ - no_printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__) -#define kproto(FMT, ...) \ - printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__) -#define _proto(FMT, ...) \ - no_printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__) - -#ifndef CODMSB -/* c_cflag bit meaning */ -#define CODMSB 004000000000 /* change Transfer bit-order */ -#endif - -#define NR_UARTS 3 - -#ifdef CONFIG_MN10300_TTYSM_CONSOLE -static void mn10300_serial_console_write(struct console *co, - const char *s, unsigned count); -static int __init mn10300_serial_console_setup(struct console *co, - char *options); - -static struct uart_driver mn10300_serial_driver; -static struct console mn10300_serial_console = { - .name = "ttySM", - .write = mn10300_serial_console_write, - .device = uart_console_device, - .setup = mn10300_serial_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &mn10300_serial_driver, -}; -#endif - -static struct uart_driver mn10300_serial_driver = { - .owner = NULL, - .driver_name = "mn10300-serial", - .dev_name = "ttySM", - .major = TTY_MAJOR, - .minor = 128, - .nr = NR_UARTS, -#ifdef CONFIG_MN10300_TTYSM_CONSOLE - .cons = &mn10300_serial_console, -#endif -}; - -static unsigned int mn10300_serial_tx_empty(struct uart_port *); -static void mn10300_serial_set_mctrl(struct uart_port *, unsigned int mctrl); -static unsigned int mn10300_serial_get_mctrl(struct uart_port *); -static void mn10300_serial_stop_tx(struct uart_port *); -static void mn10300_serial_start_tx(struct uart_port *); -static void mn10300_serial_send_xchar(struct uart_port *, char ch); -static void mn10300_serial_stop_rx(struct uart_port *); -static void mn10300_serial_enable_ms(struct uart_port *); -static void mn10300_serial_break_ctl(struct uart_port *, int ctl); -static int mn10300_serial_startup(struct uart_port *); -static void mn10300_serial_shutdown(struct uart_port *); -static void mn10300_serial_set_termios(struct uart_port *, - struct ktermios *new, - struct ktermios *old); -static const char *mn10300_serial_type(struct uart_port *); -static void mn10300_serial_release_port(struct uart_port *); -static int mn10300_serial_request_port(struct uart_port *); -static void mn10300_serial_config_port(struct uart_port *, int); -static int mn10300_serial_verify_port(struct uart_port *, - struct serial_struct *); -#ifdef CONFIG_CONSOLE_POLL -static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char); -static int mn10300_serial_poll_get_char(struct uart_port *); -#endif - -static const struct uart_ops mn10300_serial_ops = { - .tx_empty = mn10300_serial_tx_empty, - .set_mctrl = mn10300_serial_set_mctrl, - .get_mctrl = mn10300_serial_get_mctrl, - .stop_tx = mn10300_serial_stop_tx, - .start_tx = mn10300_serial_start_tx, - .send_xchar = mn10300_serial_send_xchar, - .stop_rx = mn10300_serial_stop_rx, - .enable_ms = mn10300_serial_enable_ms, - .break_ctl = mn10300_serial_break_ctl, - .startup = mn10300_serial_startup, - .shutdown = mn10300_serial_shutdown, - .set_termios = mn10300_serial_set_termios, - .type = mn10300_serial_type, - .release_port = mn10300_serial_release_port, - .request_port = mn10300_serial_request_port, - .config_port = mn10300_serial_config_port, - .verify_port = mn10300_serial_verify_port, -#ifdef CONFIG_CONSOLE_POLL - .poll_put_char = mn10300_serial_poll_put_char, - .poll_get_char = mn10300_serial_poll_get_char, -#endif -}; - -static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id); - -/* - * the first on-chip serial port: ttySM0 (aka SIF0) - */ -#ifdef CONFIG_MN10300_TTYSM0 -struct mn10300_serial_port mn10300_serial_port_sif0 = { - .uart.ops = &mn10300_serial_ops, - .uart.membase = (void __iomem *) &SC0CTR, - .uart.mapbase = (unsigned long) &SC0CTR, - .uart.iotype = UPIO_MEM, - .uart.irq = 0, - .uart.uartclk = 0, /* MN10300_IOCLK, */ - .uart.fifosize = 1, - .uart.flags = UPF_BOOT_AUTOCONF, - .uart.line = 0, - .uart.type = PORT_MN10300, - .uart.lock = - __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif0.uart.lock), - .name = "ttySM0", - ._iobase = &SC0CTR, - ._control = &SC0CTR, - ._status = (volatile u8 *)&SC0STR, - ._intr = &SC0ICR, - ._rxb = &SC0RXB, - ._txb = &SC0TXB, - .rx_name = "ttySM0:Rx", - .tx_name = "ttySM0:Tx", -#if defined(CONFIG_MN10300_TTYSM0_TIMER8) - .tm_name = "ttySM0:Timer8", - ._tmxmd = &TM8MD, - ._tmxbr = &TM8BR, - ._tmicr = &TM8ICR, - .tm_irq = TM8IRQ, - .div_timer = MNSCx_DIV_TIMER_16BIT, -#elif defined(CONFIG_MN10300_TTYSM0_TIMER0) - .tm_name = "ttySM0:Timer0", - ._tmxmd = &TM0MD, - ._tmxbr = (volatile u16 *)&TM0BR, - ._tmicr = &TM0ICR, - .tm_irq = TM0IRQ, - .div_timer = MNSCx_DIV_TIMER_8BIT, -#elif defined(CONFIG_MN10300_TTYSM0_TIMER2) - .tm_name = "ttySM0:Timer2", - ._tmxmd = &TM2MD, - ._tmxbr = (volatile u16 *)&TM2BR, - ._tmicr = &TM2ICR, - .tm_irq = TM2IRQ, - .div_timer = MNSCx_DIV_TIMER_8BIT, -#else -#error "Unknown config for ttySM0" -#endif - .rx_irq = SC0RXIRQ, - .tx_irq = SC0TXIRQ, - .rx_icr = &GxICR(SC0RXIRQ), - .tx_icr = &GxICR(SC0TXIRQ), - .clock_src = MNSCx_CLOCK_SRC_IOCLK, - .options = 0, -#ifdef CONFIG_GDBSTUB_ON_TTYSM0 - .gdbstub = 1, -#endif -}; -#endif /* CONFIG_MN10300_TTYSM0 */ - -/* - * the second on-chip serial port: ttySM1 (aka SIF1) - */ -#ifdef CONFIG_MN10300_TTYSM1 -struct mn10300_serial_port mn10300_serial_port_sif1 = { - .uart.ops = &mn10300_serial_ops, - .uart.membase = (void __iomem *) &SC1CTR, - .uart.mapbase = (unsigned long) &SC1CTR, - .uart.iotype = UPIO_MEM, - .uart.irq = 0, - .uart.uartclk = 0, /* MN10300_IOCLK, */ - .uart.fifosize = 1, - .uart.flags = UPF_BOOT_AUTOCONF, - .uart.line = 1, - .uart.type = PORT_MN10300, - .uart.lock = - __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif1.uart.lock), - .name = "ttySM1", - ._iobase = &SC1CTR, - ._control = &SC1CTR, - ._status = (volatile u8 *)&SC1STR, - ._intr = &SC1ICR, - ._rxb = &SC1RXB, - ._txb = &SC1TXB, - .rx_name = "ttySM1:Rx", - .tx_name = "ttySM1:Tx", -#if defined(CONFIG_MN10300_TTYSM1_TIMER9) - .tm_name = "ttySM1:Timer9", - ._tmxmd = &TM9MD, - ._tmxbr = &TM9BR, - ._tmicr = &TM9ICR, - .tm_irq = TM9IRQ, - .div_timer = MNSCx_DIV_TIMER_16BIT, -#elif defined(CONFIG_MN10300_TTYSM1_TIMER3) - .tm_name = "ttySM1:Timer3", - ._tmxmd = &TM3MD, - ._tmxbr = (volatile u16 *)&TM3BR, - ._tmicr = &TM3ICR, - .tm_irq = TM3IRQ, - .div_timer = MNSCx_DIV_TIMER_8BIT, -#elif defined(CONFIG_MN10300_TTYSM1_TIMER12) - .tm_name = "ttySM1/Timer12", - ._tmxmd = &TM12MD, - ._tmxbr = &TM12BR, - ._tmicr = &TM12ICR, - .tm_irq = TM12IRQ, - .div_timer = MNSCx_DIV_TIMER_16BIT, -#else -#error "Unknown config for ttySM1" -#endif - .rx_irq = SC1RXIRQ, - .tx_irq = SC1TXIRQ, - .rx_icr = &GxICR(SC1RXIRQ), - .tx_icr = &GxICR(SC1TXIRQ), - .clock_src = MNSCx_CLOCK_SRC_IOCLK, - .options = 0, -#ifdef CONFIG_GDBSTUB_ON_TTYSM1 - .gdbstub = 1, -#endif -}; -#endif /* CONFIG_MN10300_TTYSM1 */ - -/* - * the third on-chip serial port: ttySM2 (aka SIF2) - */ -#ifdef CONFIG_MN10300_TTYSM2 -struct mn10300_serial_port mn10300_serial_port_sif2 = { - .uart.ops = &mn10300_serial_ops, - .uart.membase = (void __iomem *) &SC2CTR, - .uart.mapbase = (unsigned long) &SC2CTR, - .uart.iotype = UPIO_MEM, - .uart.irq = 0, - .uart.uartclk = 0, /* MN10300_IOCLK, */ - .uart.fifosize = 1, - .uart.flags = UPF_BOOT_AUTOCONF, - .uart.line = 2, -#ifdef CONFIG_MN10300_TTYSM2_CTS - .uart.type = PORT_MN10300_CTS, -#else - .uart.type = PORT_MN10300, -#endif - .uart.lock = - __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif2.uart.lock), - .name = "ttySM2", - ._iobase = &SC2CTR, - ._control = &SC2CTR, - ._status = (volatile u8 *)&SC2STR, - ._intr = &SC2ICR, - ._rxb = &SC2RXB, - ._txb = &SC2TXB, - .rx_name = "ttySM2:Rx", - .tx_name = "ttySM2:Tx", -#if defined(CONFIG_MN10300_TTYSM2_TIMER10) - .tm_name = "ttySM2/Timer10", - ._tmxmd = &TM10MD, - ._tmxbr = &TM10BR, - ._tmicr = &TM10ICR, - .tm_irq = TM10IRQ, - .div_timer = MNSCx_DIV_TIMER_16BIT, -#elif defined(CONFIG_MN10300_TTYSM2_TIMER9) - .tm_name = "ttySM2/Timer9", - ._tmxmd = &TM9MD, - ._tmxbr = &TM9BR, - ._tmicr = &TM9ICR, - .tm_irq = TM9IRQ, - .div_timer = MNSCx_DIV_TIMER_16BIT, -#elif defined(CONFIG_MN10300_TTYSM2_TIMER1) - .tm_name = "ttySM2/Timer1", - ._tmxmd = &TM1MD, - ._tmxbr = (volatile u16 *)&TM1BR, - ._tmicr = &TM1ICR, - .tm_irq = TM1IRQ, - .div_timer = MNSCx_DIV_TIMER_8BIT, -#elif defined(CONFIG_MN10300_TTYSM2_TIMER3) - .tm_name = "ttySM2/Timer3", - ._tmxmd = &TM3MD, - ._tmxbr = (volatile u16 *)&TM3BR, - ._tmicr = &TM3ICR, - .tm_irq = TM3IRQ, - .div_timer = MNSCx_DIV_TIMER_8BIT, -#else -#error "Unknown config for ttySM2" -#endif - .rx_irq = SC2RXIRQ, - .tx_irq = SC2TXIRQ, - .rx_icr = &GxICR(SC2RXIRQ), - .tx_icr = &GxICR(SC2TXIRQ), - .clock_src = MNSCx_CLOCK_SRC_IOCLK, -#ifdef CONFIG_MN10300_TTYSM2_CTS - .options = MNSCx_OPT_CTS, -#else - .options = 0, -#endif -#ifdef CONFIG_GDBSTUB_ON_TTYSM2 - .gdbstub = 1, -#endif -}; -#endif /* CONFIG_MN10300_TTYSM2 */ - - -/* - * list of available serial ports - */ -struct mn10300_serial_port *mn10300_serial_ports[NR_UARTS + 1] = { -#ifdef CONFIG_MN10300_TTYSM0 - [0] = &mn10300_serial_port_sif0, -#endif -#ifdef CONFIG_MN10300_TTYSM1 - [1] = &mn10300_serial_port_sif1, -#endif -#ifdef CONFIG_MN10300_TTYSM2 - [2] = &mn10300_serial_port_sif2, -#endif - [NR_UARTS] = NULL, -}; - - -/* - * we abuse the serial ports' baud timers' interrupt lines to get the ability - * to deliver interrupts to userspace as we use the ports' interrupt lines to - * do virtual DMA on account of the ports having no hardware FIFOs - * - * we can generate an interrupt manually in the assembly stubs by writing to - * the enable and detect bits in the interrupt control register, so all we need - * to do here is disable the interrupt line - * - * note that we can't just leave the line enabled as the baud rate timer *also* - * generates interrupts - */ -static void mn10300_serial_mask_ack(unsigned int irq) -{ - unsigned long flags; - u16 tmp; - - flags = arch_local_cli_save(); - GxICR(irq) = GxICR_LEVEL_6; - tmp = GxICR(irq); /* flush write buffer */ - arch_local_irq_restore(flags); -} - -static void mn10300_serial_chip_mask_ack(struct irq_data *d) -{ - mn10300_serial_mask_ack(d->irq); -} - -static void mn10300_serial_nop(struct irq_data *d) -{ -} - -static struct irq_chip mn10300_serial_pic = { - .name = "mnserial", - .irq_ack = mn10300_serial_chip_mask_ack, - .irq_mask = mn10300_serial_chip_mask_ack, - .irq_mask_ack = mn10300_serial_chip_mask_ack, - .irq_unmask = mn10300_serial_nop, -}; - -static void mn10300_serial_low_mask(struct irq_data *d) -{ - unsigned long flags; - u16 tmp; - - flags = arch_local_cli_save(); - GxICR(d->irq) = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); - tmp = GxICR(d->irq); /* flush write buffer */ - arch_local_irq_restore(flags); -} - -static void mn10300_serial_low_unmask(struct irq_data *d) -{ - unsigned long flags; - u16 tmp; - - flags = arch_local_cli_save(); - GxICR(d->irq) = - NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) | GxICR_ENABLE; - tmp = GxICR(d->irq); /* flush write buffer */ - arch_local_irq_restore(flags); -} - -static struct irq_chip mn10300_serial_low_pic = { - .name = "mnserial-low", - .irq_mask = mn10300_serial_low_mask, - .irq_unmask = mn10300_serial_low_unmask, -}; - -/* - * serial virtual DMA interrupt jump table - */ -struct mn10300_serial_int mn10300_serial_int_tbl[NR_IRQS]; - -static void mn10300_serial_dis_tx_intr(struct mn10300_serial_port *port) -{ - int retries = 100; - u16 x; - - /* nothing to do if irq isn't set up */ - if (!mn10300_serial_int_tbl[port->tx_irq].port) - return; - - port->tx_flags |= MNSCx_TX_STOP; - mb(); - - /* - * Here we wait for the irq to be disabled. Either it already is - * disabled or we wait some number of retries for the VDMA handler - * to disable it. The retries give the VDMA handler enough time to - * run to completion if it was already in progress. If the VDMA IRQ - * is enabled but the handler is not yet running when arrive here, - * the STOP flag will prevent the handler from conflicting with the - * driver code following this loop. - */ - while ((*port->tx_icr & GxICR_ENABLE) && retries-- > 0) - ; - if (retries <= 0) { - *port->tx_icr = - NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); - x = *port->tx_icr; - } -} - -static void mn10300_serial_en_tx_intr(struct mn10300_serial_port *port) -{ - u16 x; - - /* nothing to do if irq isn't set up */ - if (!mn10300_serial_int_tbl[port->tx_irq].port) - return; - - /* stop vdma irq if not already stopped */ - if (!(port->tx_flags & MNSCx_TX_STOP)) - mn10300_serial_dis_tx_intr(port); - - port->tx_flags &= ~MNSCx_TX_STOP; - mb(); - - *port->tx_icr = - NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) | - GxICR_ENABLE | GxICR_REQUEST | GxICR_DETECT; - x = *port->tx_icr; -} - -static void mn10300_serial_dis_rx_intr(struct mn10300_serial_port *port) -{ - unsigned long flags; - u16 x; - - flags = arch_local_cli_save(); - *port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); - x = *port->rx_icr; - arch_local_irq_restore(flags); -} - -/* - * multi-bit equivalent of test_and_clear_bit() - */ -static int mask_test_and_clear(volatile u8 *ptr, u8 mask) -{ - u32 epsw; - asm volatile(" bclr %1,(%2) \n" - " mov epsw,%0 \n" - : "=d"(epsw) : "d"(mask), "a"(ptr) - : "cc", "memory"); - return !(epsw & EPSW_FLAG_Z); -} - -/* - * receive chars from the ring buffer for this serial port - * - must do break detection here (not done in the UART) - */ -static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port) -{ - struct uart_icount *icount = &port->uart.icount; - struct tty_port *tport = &port->uart.state->port; - unsigned ix; - int count; - u8 st, ch, push, status, overrun; - - _enter("%s", port->name); - - push = 0; - - count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE); - count = tty_buffer_request_room(tport, count); - if (count == 0) { - if (!tport->low_latency) - tty_flip_buffer_push(tport); - return; - } - -try_again: - /* pull chars out of the hat */ - ix = READ_ONCE(port->rx_outp); - if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) { - if (push && !tport->low_latency) - tty_flip_buffer_push(tport); - return; - } - - /* READ_ONCE() enforces dependency, but dangerous through integer!!! */ - ch = port->rx_buffer[ix++]; - st = port->rx_buffer[ix++]; - smp_mb(); - port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1); - port->uart.icount.rx++; - - st &= SC01STR_FEF | SC01STR_PEF | SC01STR_OEF; - status = 0; - overrun = 0; - - /* the UART doesn't detect BREAK, so we have to do that ourselves - * - it starts as a framing error on a NUL character - * - then we count another two NUL characters before issuing TTY_BREAK - * - then we end on a normal char or one that has all the bottom bits - * zero and the top bits set - */ - switch (port->rx_brk) { - case 0: - /* not breaking at the moment */ - break; - - case 1: - if (st & SC01STR_FEF && ch == 0) { - port->rx_brk = 2; - goto try_again; - } - goto not_break; - - case 2: - if (st & SC01STR_FEF && ch == 0) { - port->rx_brk = 3; - _proto("Rx Break Detected"); - icount->brk++; - if (uart_handle_break(&port->uart)) - goto ignore_char; - status |= 1 << TTY_BREAK; - goto insert; - } - goto not_break; - - default: - if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF)) - goto try_again; /* still breaking */ - - port->rx_brk = 0; /* end of the break */ - - switch (ch) { - case 0xFF: - case 0xFE: - case 0xFC: - case 0xF8: - case 0xF0: - case 0xE0: - case 0xC0: - case 0x80: - case 0x00: - /* discard char at probable break end */ - goto try_again; - } - break; - } - -process_errors: - /* handle framing error */ - if (st & SC01STR_FEF) { - if (ch == 0) { - /* framing error with NUL char is probably a BREAK */ - port->rx_brk = 1; - goto try_again; - } - - _proto("Rx Framing Error"); - icount->frame++; - status |= 1 << TTY_FRAME; - } - - /* handle parity error */ - if (st & SC01STR_PEF) { - _proto("Rx Parity Error"); - icount->parity++; - status = TTY_PARITY; - } - - /* handle normal char */ - if (status == 0) { - if (uart_handle_sysrq_char(&port->uart, ch)) - goto ignore_char; - status = (1 << TTY_NORMAL); - } - - /* handle overrun error */ - if (st & SC01STR_OEF) { - if (port->rx_brk) - goto try_again; - - _proto("Rx Overrun Error"); - icount->overrun++; - overrun = 1; - } - -insert: - status &= port->uart.read_status_mask; - - if (!overrun && !(status & port->uart.ignore_status_mask)) { - int flag; - - if (status & (1 << TTY_BREAK)) - flag = TTY_BREAK; - else if (status & (1 << TTY_PARITY)) - flag = TTY_PARITY; - else if (status & (1 << TTY_FRAME)) - flag = TTY_FRAME; - else - flag = TTY_NORMAL; - - tty_insert_flip_char(tport, ch, flag); - } - - /* overrun is special, since it's reported immediately, and doesn't - * affect the current character - */ - if (overrun) - tty_insert_flip_char(tport, 0, TTY_OVERRUN); - - count--; - if (count <= 0) { - if (!tport->low_latency) - tty_flip_buffer_push(tport); - return; - } - -ignore_char: - push = 1; - goto try_again; - -not_break: - port->rx_brk = 0; - goto process_errors; -} - -/* - * handle an interrupt from the serial transmission "virtual DMA" driver - * - note: the interrupt routine will disable its own interrupts when the Tx - * buffer is empty - */ -static void mn10300_serial_transmit_interrupt(struct mn10300_serial_port *port) -{ - _enter("%s", port->name); - - if (!port->uart.state || !port->uart.state->port.tty) { - mn10300_serial_dis_tx_intr(port); - return; - } - - if (uart_tx_stopped(&port->uart) || - uart_circ_empty(&port->uart.state->xmit)) - mn10300_serial_dis_tx_intr(port); - - if (uart_circ_chars_pending(&port->uart.state->xmit) < WAKEUP_CHARS) - uart_write_wakeup(&port->uart); -} - -/* - * deal with a change in the status of the CTS line - */ -static void mn10300_serial_cts_changed(struct mn10300_serial_port *port, u8 st) -{ - u16 ctr; - - port->tx_cts = st; - port->uart.icount.cts++; - - /* flip the CTS state selector flag to interrupt when it changes - * back */ - ctr = *port->_control; - ctr ^= SC2CTR_TWS; - *port->_control = ctr; - - uart_handle_cts_change(&port->uart, st & SC2STR_CTS); - wake_up_interruptible(&port->uart.state->port.delta_msr_wait); -} - -/* - * handle a virtual interrupt generated by the lower level "virtual DMA" - * routines (irq is the baud timer interrupt) - */ -static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id) -{ - struct mn10300_serial_port *port = dev_id; - u8 st; - - spin_lock(&port->uart.lock); - - if (port->intr_flags) { - _debug("INT %s: %x", port->name, port->intr_flags); - - if (mask_test_and_clear(&port->intr_flags, MNSCx_RX_AVAIL)) - mn10300_serial_receive_interrupt(port); - - if (mask_test_and_clear(&port->intr_flags, - MNSCx_TX_SPACE | MNSCx_TX_EMPTY)) - mn10300_serial_transmit_interrupt(port); - } - - /* the only modem control line amongst the whole lot is CTS on - * serial port 2 */ - if (port->type == PORT_MN10300_CTS) { - st = *port->_status; - if ((port->tx_cts ^ st) & SC2STR_CTS) - mn10300_serial_cts_changed(port, st); - } - - spin_unlock(&port->uart.lock); - - return IRQ_HANDLED; -} - -/* - * return indication of whether the hardware transmit buffer is empty - */ -static unsigned int mn10300_serial_tx_empty(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - return (*port->_status & (SC01STR_TXF | SC01STR_TBF)) ? - 0 : TIOCSER_TEMT; -} - -/* - * set the modem control lines (we don't have any) - */ -static void mn10300_serial_set_mctrl(struct uart_port *_port, - unsigned int mctrl) -{ - struct mn10300_serial_port *port __attribute__ ((unused)) = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s,%x", port->name, mctrl); -} - -/* - * get the modem control line statuses - */ -static unsigned int mn10300_serial_get_mctrl(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - if (port->type == PORT_MN10300_CTS && !(*port->_status & SC2STR_CTS)) - return TIOCM_CAR | TIOCM_DSR; - - return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR; -} - -/* - * stop transmitting characters - */ -static void mn10300_serial_stop_tx(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - /* disable the virtual DMA */ - mn10300_serial_dis_tx_intr(port); -} - -/* - * start transmitting characters - * - jump-start transmission if it has stalled - * - enable the serial Tx interrupt (used by the virtual DMA controller) - * - force an interrupt to happen if necessary - */ -static void mn10300_serial_start_tx(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s{%lu}", - port->name, - CIRC_CNT(&port->uart.state->xmit.head, - &port->uart.state->xmit.tail, - UART_XMIT_SIZE)); - - /* kick the virtual DMA controller */ - mn10300_serial_en_tx_intr(port); - - _debug("CTR=%04hx ICR=%02hx STR=%04x TMD=%02hx TBR=%04hx ICR=%04hx", - *port->_control, *port->_intr, *port->_status, - *port->_tmxmd, - (port->div_timer == MNSCx_DIV_TIMER_8BIT) ? - *(volatile u8 *)port->_tmxbr : *port->_tmxbr, - *port->tx_icr); -} - -/* - * transmit a high-priority XON/XOFF character - */ -static void mn10300_serial_send_xchar(struct uart_port *_port, char ch) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - unsigned long flags; - - _enter("%s,%02x", port->name, ch); - - if (likely(port->gdbstub)) { - port->tx_xchar = ch; - if (ch) { - spin_lock_irqsave(&port->uart.lock, flags); - mn10300_serial_en_tx_intr(port); - spin_unlock_irqrestore(&port->uart.lock, flags); - } - } -} - -/* - * stop receiving characters - * - called whilst the port is being closed - */ -static void mn10300_serial_stop_rx(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - u16 ctr; - - _enter("%s", port->name); - - ctr = *port->_control; - ctr &= ~SC01CTR_RXE; - *port->_control = ctr; - - mn10300_serial_dis_rx_intr(port); -} - -/* - * enable modem status interrupts - */ -static void mn10300_serial_enable_ms(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - u16 ctr, cts; - - _enter("%s", port->name); - - if (port->type == PORT_MN10300_CTS) { - /* want to interrupt when CTS goes low if CTS is now high and - * vice versa - */ - port->tx_cts = *port->_status; - - cts = (port->tx_cts & SC2STR_CTS) ? - SC2CTR_TWE : SC2CTR_TWE | SC2CTR_TWS; - - ctr = *port->_control; - ctr &= ~SC2CTR_TWS; - ctr |= cts; - *port->_control = ctr; - - mn10300_serial_en_tx_intr(port); - } -} - -/* - * transmit or cease transmitting a break signal - */ -static void mn10300_serial_break_ctl(struct uart_port *_port, int ctl) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - unsigned long flags; - - _enter("%s,%d", port->name, ctl); - - spin_lock_irqsave(&port->uart.lock, flags); - if (ctl) { - /* tell the virtual DMA handler to assert BREAK */ - port->tx_flags |= MNSCx_TX_BREAK; - mn10300_serial_en_tx_intr(port); - } else { - port->tx_flags &= ~MNSCx_TX_BREAK; - *port->_control &= ~SC01CTR_BKE; - mn10300_serial_en_tx_intr(port); - } - spin_unlock_irqrestore(&port->uart.lock, flags); -} - -/* - * grab the interrupts and enable the port for reception - */ -static int mn10300_serial_startup(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - struct mn10300_serial_int *pint; - - _enter("%s{%d}", port->name, port->gdbstub); - - if (unlikely(port->gdbstub)) - return -EBUSY; - - /* allocate an Rx buffer for the virtual DMA handler */ - port->rx_buffer = kmalloc(MNSC_BUFFER_SIZE, GFP_KERNEL); - if (!port->rx_buffer) - return -ENOMEM; - - port->rx_inp = port->rx_outp = 0; - port->tx_flags = 0; - - /* finally, enable the device */ - *port->_intr = SC01ICR_TI; - *port->_control |= SC01CTR_TXE | SC01CTR_RXE; - - pint = &mn10300_serial_int_tbl[port->rx_irq]; - pint->port = port; - pint->vdma = mn10300_serial_vdma_rx_handler; - pint = &mn10300_serial_int_tbl[port->tx_irq]; - pint->port = port; - pint->vdma = mn10300_serial_vdma_tx_handler; - - irq_set_chip(port->rx_irq, &mn10300_serial_low_pic); - irq_set_chip(port->tx_irq, &mn10300_serial_low_pic); - irq_set_chip(port->tm_irq, &mn10300_serial_pic); - - if (request_irq(port->rx_irq, mn10300_serial_interrupt, - IRQF_NOBALANCING, - port->rx_name, port) < 0) - goto error; - - if (request_irq(port->tx_irq, mn10300_serial_interrupt, - IRQF_NOBALANCING, - port->tx_name, port) < 0) - goto error2; - - if (request_irq(port->tm_irq, mn10300_serial_interrupt, - IRQF_NOBALANCING, - port->tm_name, port) < 0) - goto error3; - mn10300_serial_mask_ack(port->tm_irq); - - return 0; - -error3: - free_irq(port->tx_irq, port); -error2: - free_irq(port->rx_irq, port); -error: - kfree(port->rx_buffer); - port->rx_buffer = NULL; - return -EBUSY; -} - -/* - * shutdown the port and release interrupts - */ -static void mn10300_serial_shutdown(struct uart_port *_port) -{ - unsigned long flags; - u16 x; - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - spin_lock_irqsave(&_port->lock, flags); - mn10300_serial_dis_tx_intr(port); - - *port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); - x = *port->rx_icr; - port->tx_flags = 0; - spin_unlock_irqrestore(&_port->lock, flags); - - /* disable the serial port and its baud rate timer */ - *port->_control &= ~(SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE); - *port->_tmxmd = 0; - - if (port->rx_buffer) { - void *buf = port->rx_buffer; - port->rx_buffer = NULL; - kfree(buf); - } - - /* disable all intrs */ - free_irq(port->tm_irq, port); - free_irq(port->rx_irq, port); - free_irq(port->tx_irq, port); - - mn10300_serial_int_tbl[port->tx_irq].port = NULL; - mn10300_serial_int_tbl[port->rx_irq].port = NULL; -} - -/* - * this routine is called to set the UART divisor registers to match the - * specified baud rate for a serial port. - */ -static void mn10300_serial_change_speed(struct mn10300_serial_port *port, - struct ktermios *new, - struct ktermios *old) -{ - unsigned long flags; - unsigned long ioclk = port->ioclk; - unsigned cflag; - int baud, bits, xdiv, tmp; - u16 tmxbr, scxctr; - u8 tmxmd, battempt; - u8 div_timer = port->div_timer; - - _enter("%s{%lu}", port->name, ioclk); - - /* byte size and parity */ - cflag = new->c_cflag; - switch (cflag & CSIZE) { - case CS7: scxctr = SC01CTR_CLN_7BIT; bits = 9; break; - case CS8: scxctr = SC01CTR_CLN_8BIT; bits = 10; break; - default: scxctr = SC01CTR_CLN_8BIT; bits = 10; break; - } - - if (cflag & CSTOPB) { - scxctr |= SC01CTR_STB_2BIT; - bits++; - } - - if (cflag & PARENB) { - bits++; - if (cflag & PARODD) - scxctr |= SC01CTR_PB_ODD; -#ifdef CMSPAR - else if (cflag & CMSPAR) - scxctr |= SC01CTR_PB_FIXED0; -#endif - else - scxctr |= SC01CTR_PB_EVEN; - } - - /* Determine divisor based on baud rate */ - battempt = 0; - - switch (port->uart.line) { -#ifdef CONFIG_MN10300_TTYSM0 - case 0: /* ttySM0 */ -#if defined(CONFIG_MN10300_TTYSM0_TIMER8) - scxctr |= SC0CTR_CK_TM8UFLOW_8; -#elif defined(CONFIG_MN10300_TTYSM0_TIMER0) - scxctr |= SC0CTR_CK_TM0UFLOW_8; -#elif defined(CONFIG_MN10300_TTYSM0_TIMER2) - scxctr |= SC0CTR_CK_TM2UFLOW_8; -#else -#error "Unknown config for ttySM0" -#endif - break; -#endif /* CONFIG_MN10300_TTYSM0 */ - -#ifdef CONFIG_MN10300_TTYSM1 - case 1: /* ttySM1 */ -#if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3) -#if defined(CONFIG_MN10300_TTYSM1_TIMER9) - scxctr |= SC1CTR_CK_TM9UFLOW_8; -#elif defined(CONFIG_MN10300_TTYSM1_TIMER3) - scxctr |= SC1CTR_CK_TM3UFLOW_8; -#else -#error "Unknown config for ttySM1" -#endif -#else /* CONFIG_AM33_2 || CONFIG_AM33_3 */ -#if defined(CONFIG_MN10300_TTYSM1_TIMER12) - scxctr |= SC1CTR_CK_TM12UFLOW_8; -#else -#error "Unknown config for ttySM1" -#endif -#endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */ - break; -#endif /* CONFIG_MN10300_TTYSM1 */ - -#ifdef CONFIG_MN10300_TTYSM2 - case 2: /* ttySM2 */ -#if defined(CONFIG_AM33_2) -#if defined(CONFIG_MN10300_TTYSM2_TIMER10) - scxctr |= SC2CTR_CK_TM10UFLOW; -#else -#error "Unknown config for ttySM2" -#endif -#else /* CONFIG_AM33_2 */ -#if defined(CONFIG_MN10300_TTYSM2_TIMER9) - scxctr |= SC2CTR_CK_TM9UFLOW_8; -#elif defined(CONFIG_MN10300_TTYSM2_TIMER1) - scxctr |= SC2CTR_CK_TM1UFLOW_8; -#elif defined(CONFIG_MN10300_TTYSM2_TIMER3) - scxctr |= SC2CTR_CK_TM3UFLOW_8; -#else -#error "Unknown config for ttySM2" -#endif -#endif /* CONFIG_AM33_2 */ - break; -#endif /* CONFIG_MN10300_TTYSM2 */ - - default: - break; - } - -try_alternative: - baud = uart_get_baud_rate(&port->uart, new, old, 0, - port->ioclk / 8); - - _debug("ALT %d [baud %d]", battempt, baud); - - if (!baud) - baud = 9600; /* B0 transition handled in rs_set_termios */ - xdiv = 1; - if (baud == 134) { - baud = 269; /* 134 is really 134.5 */ - xdiv = 2; - } - - if (baud == 38400 && - (port->uart.flags & UPF_SPD_MASK) == UPF_SPD_CUST - ) { - _debug("CUSTOM %u", port->uart.custom_divisor); - - if (div_timer == MNSCx_DIV_TIMER_16BIT) { - if (port->uart.custom_divisor <= 65535) { - tmxmd = TM8MD_SRC_IOCLK; - tmxbr = port->uart.custom_divisor; - port->uart.uartclk = ioclk; - goto timer_okay; - } - if (port->uart.custom_divisor / 8 <= 65535) { - tmxmd = TM8MD_SRC_IOCLK_8; - tmxbr = port->uart.custom_divisor / 8; - port->uart.custom_divisor = tmxbr * 8; - port->uart.uartclk = ioclk / 8; - goto timer_okay; - } - if (port->uart.custom_divisor / 32 <= 65535) { - tmxmd = TM8MD_SRC_IOCLK_32; - tmxbr = port->uart.custom_divisor / 32; - port->uart.custom_divisor = tmxbr * 32; - port->uart.uartclk = ioclk / 32; - goto timer_okay; - } - - } else if (div_timer == MNSCx_DIV_TIMER_8BIT) { - if (port->uart.custom_divisor <= 255) { - tmxmd = TM2MD_SRC_IOCLK; - tmxbr = port->uart.custom_divisor; - port->uart.uartclk = ioclk; - goto timer_okay; - } - if (port->uart.custom_divisor / 8 <= 255) { - tmxmd = TM2MD_SRC_IOCLK_8; - tmxbr = port->uart.custom_divisor / 8; - port->uart.custom_divisor = tmxbr * 8; - port->uart.uartclk = ioclk / 8; - goto timer_okay; - } - if (port->uart.custom_divisor / 32 <= 255) { - tmxmd = TM2MD_SRC_IOCLK_32; - tmxbr = port->uart.custom_divisor / 32; - port->uart.custom_divisor = tmxbr * 32; - port->uart.uartclk = ioclk / 32; - goto timer_okay; - } - } - } - - switch (div_timer) { - case MNSCx_DIV_TIMER_16BIT: - port->uart.uartclk = ioclk; - tmxmd = TM8MD_SRC_IOCLK; - tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1; - if (tmp > 0 && tmp <= 65535) - goto timer_okay; - - port->uart.uartclk = ioclk / 8; - tmxmd = TM8MD_SRC_IOCLK_8; - tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1; - if (tmp > 0 && tmp <= 65535) - goto timer_okay; - - port->uart.uartclk = ioclk / 32; - tmxmd = TM8MD_SRC_IOCLK_32; - tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1; - if (tmp > 0 && tmp <= 65535) - goto timer_okay; - break; - - case MNSCx_DIV_TIMER_8BIT: - port->uart.uartclk = ioclk; - tmxmd = TM2MD_SRC_IOCLK; - tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1; - if (tmp > 0 && tmp <= 255) - goto timer_okay; - - port->uart.uartclk = ioclk / 8; - tmxmd = TM2MD_SRC_IOCLK_8; - tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1; - if (tmp > 0 && tmp <= 255) - goto timer_okay; - - port->uart.uartclk = ioclk / 32; - tmxmd = TM2MD_SRC_IOCLK_32; - tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1; - if (tmp > 0 && tmp <= 255) - goto timer_okay; - break; - - default: - BUG(); - return; - } - - /* refuse to change to a baud rate we can't support */ - _debug("CAN'T SUPPORT"); - - switch (battempt) { - case 0: - if (old) { - new->c_cflag &= ~CBAUD; - new->c_cflag |= (old->c_cflag & CBAUD); - battempt = 1; - goto try_alternative; - } - - case 1: - /* as a last resort, if the quotient is zero, default to 9600 - * bps */ - new->c_cflag &= ~CBAUD; - new->c_cflag |= B9600; - battempt = 2; - goto try_alternative; - - default: - /* hmmm... can't seem to support 9600 either - * - we could try iterating through the speeds we know about to - * find the lowest - */ - new->c_cflag &= ~CBAUD; - new->c_cflag |= B0; - - if (div_timer == MNSCx_DIV_TIMER_16BIT) - tmxmd = TM8MD_SRC_IOCLK_32; - else if (div_timer == MNSCx_DIV_TIMER_8BIT) - tmxmd = TM2MD_SRC_IOCLK_32; - tmxbr = 1; - - port->uart.uartclk = ioclk / 32; - break; - } -timer_okay: - - _debug("UARTCLK: %u / %hu", port->uart.uartclk, tmxbr); - - /* make the changes */ - spin_lock_irqsave(&port->uart.lock, flags); - - uart_update_timeout(&port->uart, new->c_cflag, baud); - - /* set the timer to produce the required baud rate */ - switch (div_timer) { - case MNSCx_DIV_TIMER_16BIT: - *port->_tmxmd = 0; - *port->_tmxbr = tmxbr; - *port->_tmxmd = TM8MD_INIT_COUNTER; - *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE; - break; - - case MNSCx_DIV_TIMER_8BIT: - *port->_tmxmd = 0; - *(volatile u8 *) port->_tmxbr = (u8) tmxbr; - *port->_tmxmd = TM2MD_INIT_COUNTER; - *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE; - break; - } - - /* CTS flow control flag and modem status interrupts */ - scxctr &= ~(SC2CTR_TWE | SC2CTR_TWS); - - if (port->type == PORT_MN10300_CTS && cflag & CRTSCTS) { - /* want to interrupt when CTS goes low if CTS is now - * high and vice versa - */ - port->tx_cts = *port->_status; - - if (port->tx_cts & SC2STR_CTS) - scxctr |= SC2CTR_TWE; - else - scxctr |= SC2CTR_TWE | SC2CTR_TWS; - } - - /* set up parity check flag */ - port->uart.read_status_mask = (1 << TTY_NORMAL) | (1 << TTY_OVERRUN); - if (new->c_iflag & INPCK) - port->uart.read_status_mask |= - (1 << TTY_PARITY) | (1 << TTY_FRAME); - if (new->c_iflag & (BRKINT | PARMRK)) - port->uart.read_status_mask |= (1 << TTY_BREAK); - - /* characters to ignore */ - port->uart.ignore_status_mask = 0; - if (new->c_iflag & IGNPAR) - port->uart.ignore_status_mask |= - (1 << TTY_PARITY) | (1 << TTY_FRAME); - if (new->c_iflag & IGNBRK) { - port->uart.ignore_status_mask |= (1 << TTY_BREAK); - /* - * If we're ignoring parity and break indicators, - * ignore overruns to (for real raw support). - */ - if (new->c_iflag & IGNPAR) - port->uart.ignore_status_mask |= (1 << TTY_OVERRUN); - } - - /* Ignore all characters if CREAD is not set */ - if ((new->c_cflag & CREAD) == 0) - port->uart.ignore_status_mask |= (1 << TTY_NORMAL); - - scxctr |= SC01CTR_TXE | SC01CTR_RXE; - scxctr |= *port->_control & SC01CTR_BKE; - *port->_control = scxctr; - - spin_unlock_irqrestore(&port->uart.lock, flags); -} - -/* - * set the terminal I/O parameters - */ -static void mn10300_serial_set_termios(struct uart_port *_port, - struct ktermios *new, - struct ktermios *old) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s,%p,%p", port->name, new, old); - - mn10300_serial_change_speed(port, new, old); - - /* handle turning off CRTSCTS */ - if (!(new->c_cflag & CRTSCTS)) { - u16 ctr = *port->_control; - ctr &= ~SC2CTR_TWE; - *port->_control = ctr; - } - - /* change Transfer bit-order (LSB/MSB) */ - if (new->c_cflag & CODMSB) - *port->_control |= SC01CTR_OD_MSBFIRST; /* MSB MODE */ - else - *port->_control &= ~SC01CTR_OD_MSBFIRST; /* LSB MODE */ -} - -/* - * return description of port type - */ -static const char *mn10300_serial_type(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - if (port->uart.type == PORT_MN10300_CTS) - return "MN10300 SIF_CTS"; - - return "MN10300 SIF"; -} - -/* - * release I/O and memory regions in use by port - */ -static void mn10300_serial_release_port(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - release_mem_region((unsigned long) port->_iobase, 16); -} - -/* - * request I/O and memory regions for port - */ -static int mn10300_serial_request_port(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - request_mem_region((unsigned long) port->_iobase, 16, port->name); - return 0; -} - -/* - * configure the type and reserve the ports - */ -static void mn10300_serial_config_port(struct uart_port *_port, int type) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - - _enter("%s", port->name); - - port->uart.type = PORT_MN10300; - - if (port->options & MNSCx_OPT_CTS) - port->uart.type = PORT_MN10300_CTS; - - mn10300_serial_request_port(_port); -} - -/* - * verify serial parameters are suitable for this port type - */ -static int mn10300_serial_verify_port(struct uart_port *_port, - struct serial_struct *ss) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - void *mapbase = (void *) (unsigned long) port->uart.mapbase; - - _enter("%s", port->name); - - /* these things may not be changed */ - if (ss->irq != port->uart.irq || - ss->port != port->uart.iobase || - ss->io_type != port->uart.iotype || - ss->iomem_base != mapbase || - ss->iomem_reg_shift != port->uart.regshift || - ss->hub6 != port->uart.hub6 || - ss->xmit_fifo_size != port->uart.fifosize) - return -EINVAL; - - /* type may be changed on a port that supports CTS */ - if (ss->type != port->uart.type) { - if (!(port->options & MNSCx_OPT_CTS)) - return -EINVAL; - - if (ss->type != PORT_MN10300 && - ss->type != PORT_MN10300_CTS) - return -EINVAL; - } - - return 0; -} - -/* - * initialise the MN10300 on-chip UARTs - */ -static int __init mn10300_serial_init(void) -{ - struct mn10300_serial_port *port; - int ret, i; - - printk(KERN_INFO "%s version %s (%s)\n", - serial_name, serial_version, serial_revdate); - -#if defined(CONFIG_MN10300_TTYSM2) && defined(CONFIG_AM33_2) - { - int tmp; - SC2TIM = 8; /* make the baud base of timer 2 IOCLK/8 */ - tmp = SC2TIM; - } -#endif - - set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL), - mn10300_serial_vdma_interrupt); - - ret = uart_register_driver(&mn10300_serial_driver); - if (!ret) { - for (i = 0 ; i < NR_PORTS ; i++) { - port = mn10300_serial_ports[i]; - if (!port || port->gdbstub) - continue; - - switch (port->clock_src) { - case MNSCx_CLOCK_SRC_IOCLK: - port->ioclk = MN10300_IOCLK; - break; - -#ifdef MN10300_IOBCLK - case MNSCx_CLOCK_SRC_IOBCLK: - port->ioclk = MN10300_IOBCLK; - break; -#endif - default: - BUG(); - } - - ret = uart_add_one_port(&mn10300_serial_driver, - &port->uart); - - if (ret < 0) { - _debug("ERROR %d", -ret); - break; - } - } - - if (ret) - uart_unregister_driver(&mn10300_serial_driver); - } - - return ret; -} - -__initcall(mn10300_serial_init); - - -#ifdef CONFIG_MN10300_TTYSM_CONSOLE - -/* - * print a string to the serial port without disturbing the real user of the - * port too much - * - the console must be locked by the caller - */ -static void mn10300_serial_console_write(struct console *co, - const char *s, unsigned count) -{ - struct mn10300_serial_port *port; - unsigned i; - u16 scxctr; - u8 tmxmd; - unsigned long flags; - int locked = 1; - - port = mn10300_serial_ports[co->index]; - - local_irq_save(flags); - if (port->uart.sysrq) { - /* mn10300_serial_interrupt() already took the lock */ - locked = 0; - } else if (oops_in_progress) { - locked = spin_trylock(&port->uart.lock); - } else - spin_lock(&port->uart.lock); - - /* firstly hijack the serial port from the "virtual DMA" controller */ - mn10300_serial_dis_tx_intr(port); - - /* the transmitter may be disabled */ - scxctr = *port->_control; - if (!(scxctr & SC01CTR_TXE)) { - /* restart the UART clock */ - tmxmd = *port->_tmxmd; - - switch (port->div_timer) { - case MNSCx_DIV_TIMER_16BIT: - *port->_tmxmd = 0; - *port->_tmxmd = TM8MD_INIT_COUNTER; - *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE; - break; - - case MNSCx_DIV_TIMER_8BIT: - *port->_tmxmd = 0; - *port->_tmxmd = TM2MD_INIT_COUNTER; - *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE; - break; - } - - /* enable the transmitter */ - *port->_control = (scxctr & ~SC01CTR_BKE) | SC01CTR_TXE; - - } else if (scxctr & SC01CTR_BKE) { - /* stop transmitting BREAK */ - *port->_control = (scxctr & ~SC01CTR_BKE); - } - - /* send the chars into the serial port (with LF -> LFCR conversion) */ - for (i = 0; i < count; i++) { - char ch = *s++; - - while (*port->_status & SC01STR_TBF) - continue; - *port->_txb = ch; - - if (ch == 0x0a) { - while (*port->_status & SC01STR_TBF) - continue; - *port->_txb = 0xd; - } - } - - /* can't let the transmitter be turned off if it's actually - * transmitting */ - while (*port->_status & (SC01STR_TXF | SC01STR_TBF)) - continue; - - /* disable the transmitter if we re-enabled it */ - if (!(scxctr & SC01CTR_TXE)) - *port->_control = scxctr; - - mn10300_serial_en_tx_intr(port); - - if (locked) - spin_unlock(&port->uart.lock); - local_irq_restore(flags); -} - -/* - * set up a serial port as a console - * - construct a cflag setting for the first rs_open() - * - initialize the serial port - * - return non-zero if we didn't find a serial port. - */ -static int __init mn10300_serial_console_setup(struct console *co, - char *options) -{ - struct mn10300_serial_port *port; - int i, parity = 'n', baud = 9600, bits = 8, flow = 0; - - for (i = 0 ; i < NR_PORTS ; i++) { - port = mn10300_serial_ports[i]; - if (port && !port->gdbstub && port->uart.line == co->index) - goto found_device; - } - - return -ENODEV; - -found_device: - switch (port->clock_src) { - case MNSCx_CLOCK_SRC_IOCLK: - port->ioclk = MN10300_IOCLK; - break; - -#ifdef MN10300_IOBCLK - case MNSCx_CLOCK_SRC_IOBCLK: - port->ioclk = MN10300_IOBCLK; - break; -#endif - default: - BUG(); - } - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - - return uart_set_options(&port->uart, co, baud, parity, bits, flow); -} - -/* - * register console - */ -static int __init mn10300_serial_console_init(void) -{ - register_console(&mn10300_serial_console); - return 0; -} - -console_initcall(mn10300_serial_console_init); -#endif - -#ifdef CONFIG_CONSOLE_POLL -/* - * Polled character reception for the kernel debugger - */ -static int mn10300_serial_poll_get_char(struct uart_port *_port) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - unsigned ix; - u8 st, ch; - - _enter("%s", port->name); - - if (mn10300_serial_int_tbl[port->rx_irq].port != NULL) { - do { - /* pull chars out of the hat */ - ix = READ_ONCE(port->rx_outp); - if (CIRC_CNT(port->rx_inp, ix, MNSC_BUFFER_SIZE) == 0) - return NO_POLL_CHAR; - - /* - * READ_ONCE() enforces dependency, but dangerous - * through integer!!! - */ - ch = port->rx_buffer[ix++]; - st = port->rx_buffer[ix++]; - smp_mb(); - port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1); - - } while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF)); - } else { - do { - st = *port->_status; - if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF)) - continue; - } while (!(st & SC01STR_RBF)); - - ch = *port->_rxb; - } - - return ch; -} - - -/* - * Polled character transmission for the kernel debugger - */ -static void mn10300_serial_poll_put_char(struct uart_port *_port, - unsigned char ch) -{ - struct mn10300_serial_port *port = - container_of(_port, struct mn10300_serial_port, uart); - u8 intr, tmp; - - /* wait for the transmitter to finish anything it might be doing (and - * this includes the virtual DMA handler, so it might take a while) */ - while (*port->_status & (SC01STR_TBF | SC01STR_TXF)) - continue; - - /* disable the Tx ready interrupt */ - intr = *port->_intr; - *port->_intr = intr & ~SC01ICR_TI; - tmp = *port->_intr; - - if (ch == 0x0a) { - *port->_txb = 0x0d; - while (*port->_status & SC01STR_TBF) - continue; - } - - *port->_txb = ch; - while (*port->_status & SC01STR_TBF) - continue; - - /* restore the Tx interrupt flag */ - *port->_intr = intr; - tmp = *port->_intr; -} - -#endif /* CONFIG_CONSOLE_POLL */ |