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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>
This commit is contained in:
Feng Tang 2010-10-14 17:47:35 +08:00 committed by Greg Kroah-Hartman
parent abf4f6a514
commit e5586eccc9
1 changed files with 27 additions and 14 deletions
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41
drivers/serial/mfd.c
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@ -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))