diff options
| author | Feng Tang <feng.tang@intel.com> | 2010-10-14 17:47:35 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:20:10 -0700 |
| commit | e5586eccc9aaf485985480e4d3049acffaa3fa90 (patch) | |
| tree | f714f207536de2f04af5e3c6cf29348724e1585d /drivers/serial | |
| parent | abf4f6a51477a68fe144b0c62f10c410b0c41378 (diff) | |
serial: mfd: add more baud rates support
Add more baud rates support referring the baud_table[] defined
in drivers/char/tty_ioctl.c: 3000000/2000000/1000000/500000
Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Alan Cox <alan.cox@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/mfd.c | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/drivers/serial/mfd.c b/drivers/serial/mfd.c index ad35130cd8a..735799e30aa 100644 --- a/drivers/serial/mfd.c +++ b/drivers/serial/mfd.c @@ -929,39 +929,52 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios, cval |= UART_LCR_EPAR; /* + * The base clk is 50Mhz, and the baud rate come from: + * baud = 50M * MUL / (DIV * PS * DLAB) + * * For those basic low baud rate we can get the direct - * scalar from 2746800, like 115200 = 2746800/24, for those - * higher baud rate, we have to handle them case by case, - * but DIV reg is never touched as its default value 0x3d09 + * scalar from 2746800, like 115200 = 2746800/24. For those + * higher baud rate, we handle them case by case, mainly by + * adjusting the MUL/PS registers, and DIV register is kept + * as default value 0x3d09 to make things simple */ baud = uart_get_baud_rate(port, termios, old, 0, 4000000); - quot = uart_get_divisor(port, baud); + quot = 1; switch (baud) { case 3500000: mul = 0x3345; ps = 0xC; - quot = 1; + break; + case 3000000: + mul = 0x2EE0; break; case 2500000: mul = 0x2710; - ps = 0x10; - quot = 1; break; - case 18432000: + case 2000000: + mul = 0x1F40; + break; + case 1843200: mul = 0x2400; - ps = 0x10; - quot = 1; break; case 1500000: - mul = 0x1D4C; - ps = 0xc; - quot = 1; + mul = 0x1770; + break; + case 1000000: + mul = 0xFA0; + break; + case 500000: + mul = 0x7D0; break; default: - ; + /* Use uart_get_divisor to get quot for other baud rates */ + quot = 0; } + if (!quot) + quot = uart_get_divisor(port, baud); + if ((up->port.uartclk / quot) < (2400 * 16)) fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B; else if ((up->port.uartclk / quot) < (230400 * 16)) |