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| author | Stephen Boyd | 2013-07-24 20:37:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2013-07-27 01:13:29 +0200 |
| commit | 6909dadd914259f459828b11c378ddea08d40ab6 (patch) | |
| tree | 396af77914babdd211843fc976f2011918d7e955 /drivers/tty/serial/msm_serial.h | |
| parent | msm_serial: Fix sparse warnings (diff) | |
| download | kernel-qcow2-linux-6909dadd914259f459828b11c378ddea08d40ab6.tar.gz kernel-qcow2-linux-6909dadd914259f459828b11c378ddea08d40ab6.tar.xz kernel-qcow2-linux-6909dadd914259f459828b11c378ddea08d40ab6.zip | |
msm_serial: Make baud_code detection more dynamic
Currently msm_set_baud_rate() assumes the uart clock rate is
1.8432 MHz. This is not always true, and limits our options to
program the baud rate. Instead of assuming the rate and
hard-coding the baud_code based on it, calculate the divider that
we want and try to find the closest baud_code that matches. This
allows us to support uarts with faster clock speeds.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/msm_serial.h')
| -rw-r--r-- | drivers/tty/serial/msm_serial.h | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h index 15c186ecbd9e..469fda50ac63 100644 --- a/drivers/tty/serial/msm_serial.h +++ b/drivers/tty/serial/msm_serial.h @@ -38,19 +38,7 @@ #define UART_MR2_PARITY_MODE_SPACE 0x3 #define UART_MR2_PARITY_MODE 0x3 -#define UART_CSR 0x0008 -#define UART_CSR_115200 0xFF -#define UART_CSR_57600 0xEE -#define UART_CSR_38400 0xDD -#define UART_CSR_28800 0xCC -#define UART_CSR_19200 0xBB -#define UART_CSR_14400 0xAA -#define UART_CSR_9600 0x99 -#define UART_CSR_4800 0x77 -#define UART_CSR_2400 0x55 -#define UART_CSR_1200 0x44 -#define UART_CSR_600 0x33 -#define UART_CSR_300 0x22 +#define UART_CSR 0x0008 #define UART_TF 0x000C #define UARTDM_TF 0x0070 @@ -152,6 +140,7 @@ static inline void msm_serial_set_mnd_regs_tcxo(struct uart_port *port) msm_write(port, 0xF1, UART_NREG); msm_write(port, 0x0F, UART_DREG); msm_write(port, 0x1A, UART_MNDREG); + port->uartclk = 1843200; } /* @@ -163,6 +152,7 @@ static inline void msm_serial_set_mnd_regs_tcxoby4(struct uart_port *port) msm_write(port, 0xF6, UART_NREG); msm_write(port, 0x0F, UART_DREG); msm_write(port, 0x0A, UART_MNDREG); + port->uartclk = 1843200; } static inline @@ -170,7 +160,7 @@ void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port) { if (port->uartclk == 19200000) msm_serial_set_mnd_regs_tcxo(port); - else + else if (port->uartclk == 4800000) msm_serial_set_mnd_regs_tcxoby4(port); } |