diff options
| author | Denis Turischev | 2011-03-10 15:14:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2011-03-14 16:24:23 -0700 |
| commit | 6ae705b23be8da52d3163be9d81e9b767876aaf9 (patch) | |
| tree | 02d1343739ebbbccc0b0b75ceca9ec749c686917 /drivers | |
| parent | 1a738dcf6dac74a0ce10853a068d822f66f73268 (diff) | |
pch_uart: reference clock on CM-iTC
Default clock source for UARTs on Topcliff is external UART_CLK.
On CM-iTC USB_48MHz is used instead. After VCO2PLL and DIV
manipulations UARTs will receive 192 MHz.
Clock manipulations on Topcliff are controlled in pch_phub.c
v2: redone against the linux-next tree
v3: redone against linux/kernel/git/next/linux-next.git snapshot
Signed-off-by: Denis Turischev <denis@compulab.co.il>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/misc/pch_phub.c | 16 | ||||
| -rw-r--r-- | drivers/tty/serial/pch_uart.c | 9 |
2 files changed, 23 insertions, 2 deletions
diff --git a/drivers/misc/pch_phub.c b/drivers/misc/pch_phub.c index 98bffc471b17..5dd0b921bfc6 100644 --- a/drivers/misc/pch_phub.c +++ b/drivers/misc/pch_phub.c @@ -27,6 +27,7 @@ #include <linux/mutex.h> #include <linux/if_ether.h> #include <linux/ctype.h> +#include <linux/dmi.h> #define PHUB_STATUS 0x00 /* Status Register offset */ #define PHUB_CONTROL 0x04 /* Control Register offset */ @@ -46,6 +47,13 @@ #define PCH_MINOR_NOS 1 #define CLKCFG_CAN_50MHZ 0x12000000 #define CLKCFG_CANCLK_MASK 0xFF000000 +#define CLKCFG_UART_MASK 0xFFFFFF + +/* CM-iTC */ +#define CLKCFG_UART_48MHZ (1 << 16) +#define CLKCFG_BAUDDIV (2 << 20) +#define CLKCFG_PLL2VCO (8 << 9) +#define CLKCFG_UARTCLKSEL (1 << 18) /* Macros for ML7213 */ #define PCI_VENDOR_ID_ROHM 0x10db @@ -618,6 +626,14 @@ static int __devinit pch_phub_probe(struct pci_dev *pdev, CLKCFG_CAN_50MHZ, CLKCFG_CANCLK_MASK); + /* quirk for CM-iTC board */ + if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC")) + pch_phub_read_modify_write_reg(chip, + (unsigned int)CLKCFG_REG_OFFSET, + CLKCFG_UART_48MHZ | CLKCFG_BAUDDIV | + CLKCFG_PLL2VCO | CLKCFG_UARTCLKSEL, + CLKCFG_UART_MASK); + /* set the prefech value */ iowrite32(0x000affaa, chip->pch_phub_base_address + 0x14); /* set the interrupt delay value */ diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index a5ce9a5c018d..a9ad7f33526d 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -21,6 +21,7 @@ #include <linux/serial_core.h> #include <linux/interrupt.h> #include <linux/io.h> +#include <linux/dmi.h> #include <linux/dmaengine.h> #include <linux/pch_dma.h> @@ -1404,14 +1405,18 @@ static struct eg20t_port *pch_uart_init_port(struct pci_dev *pdev, if (!rxbuf) goto init_port_free_txbuf; + base_baud = 1843200; /* 1.8432MHz */ + + /* quirk for CM-iTC board */ + if (strstr(dmi_get_system_info(DMI_BOARD_NAME), "CM-iTC")) + base_baud = 192000000; /* 192.0MHz */ + switch (port_type) { case PORT_UNKNOWN: fifosize = 256; /* EG20T/ML7213: UART0 */ - base_baud = 1843200; /* 1.8432MHz */ break; case PORT_8250: fifosize = 64; /* EG20T:UART1~3 ML7213: UART1~2*/ - base_baud = 1843200; /* 1.8432MHz */ break; default: dev_err(&pdev->dev, "Invalid Port Type(=%d)\n", port_type); |