diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/msm_serial.c | 21 | ||||
| -rw-r--r-- | drivers/serial/msm_serial.h | 56 |
2 files changed, 59 insertions, 18 deletions
diff --git a/drivers/serial/msm_serial.c b/drivers/serial/msm_serial.c index ecdc0facf7ee..f8c816e7725d 100644 --- a/drivers/serial/msm_serial.c +++ b/drivers/serial/msm_serial.c @@ -41,19 +41,6 @@ struct msm_port { unsigned int imr; }; -#define UART_TO_MSM(uart_port) ((struct msm_port *) uart_port) - -static inline void msm_write(struct uart_port *port, unsigned int val, - unsigned int off) -{ - __raw_writel(val, port->membase + off); -} - -static inline unsigned int msm_read(struct uart_port *port, unsigned int off) -{ - return __raw_readl(port->membase + off); -} - static void msm_stop_tx(struct uart_port *port) { struct msm_port *msm_port = UART_TO_MSM(port); @@ -320,11 +307,7 @@ static void msm_init_clock(struct uart_port *port) struct msm_port *msm_port = UART_TO_MSM(port); clk_enable(msm_port->clk); - - msm_write(port, 0xC0, UART_MREG); - msm_write(port, 0xB2, UART_NREG); - msm_write(port, 0x7D, UART_DREG); - msm_write(port, 0x1C, UART_MNDREG); + msm_serial_set_mnd_regs(port); } static int msm_startup(struct uart_port *port) @@ -706,6 +689,8 @@ static int __init msm_serial_probe(struct platform_device *pdev) if (unlikely(IS_ERR(msm_port->clk))) return PTR_ERR(msm_port->clk); port->uartclk = clk_get_rate(msm_port->clk); + printk(KERN_INFO "uartclk = %d\n", port->uartclk); + resource = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (unlikely(!resource)) diff --git a/drivers/serial/msm_serial.h b/drivers/serial/msm_serial.h index 689f1fa0e84e..f6ca9ca79e98 100644 --- a/drivers/serial/msm_serial.h +++ b/drivers/serial/msm_serial.h @@ -114,4 +114,60 @@ #define UART_MISR 0x0010 #define UART_ISR 0x0014 +#define UART_TO_MSM(uart_port) ((struct msm_port *) uart_port) + +static inline +void msm_write(struct uart_port *port, unsigned int val, unsigned int off) +{ + __raw_writel(val, port->membase + off); +} + +static inline +unsigned int msm_read(struct uart_port *port, unsigned int off) +{ + return __raw_readl(port->membase + off); +} + +/* + * Setup the MND registers to use the TCXO clock. + */ +static inline void msm_serial_set_mnd_regs_tcxo(struct uart_port *port) +{ + msm_write(port, 0x06, UART_MREG); + msm_write(port, 0xF1, UART_NREG); + msm_write(port, 0x0F, UART_DREG); + msm_write(port, 0x1A, UART_MNDREG); +} + +/* + * Setup the MND registers to use the TCXO clock divided by 4. + */ +static inline void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port) +{ + msm_write(port, 0x18, UART_MREG); + msm_write(port, 0xF6, UART_NREG); + msm_write(port, 0x0F, UART_DREG); + msm_write(port, 0x0A, UART_MNDREG); +} + +static inline +void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port) +{ + if (port->uartclk == 19200000) + msm_serial_set_mnd_regs_tcxo(port); + else + msm_serial_set_mnd_regs_tcxoby4(port); +} + +/* + * TROUT has a specific defect that makes it report it's uartclk + * as 19.2Mhz (TCXO) when it's actually 4.8Mhz (TCXO/4). This special + * cases TROUT to use the right clock. + */ +#ifdef CONFIG_MACH_TROUT +#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_tcxoby4 +#else +#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_from_uartclk +#endif + #endif /* __DRIVERS_SERIAL_MSM_SERIAL_H */ |