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serial: mfd: adjust the baud rate setting 

Previous baud rate setting code only has been tested with 3.5M/9600/
115200/230400/460800 bps, and recently we got a 3M bps device to test,
which needs to modify current MUL register setting, and with this
patch 2.5M/2M/1.5M/1M/0.5M should also work as they just use a MUL
value scale down from 3M's.

Also got some reference register setting from silicon guys for
different baud rates, which tries to keep the pre-scalar register value
to 16.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Feng Tang 2010-11-19 11:01:48 +08:00 committed by Greg Kroah-Hartman
parent acfa747baf
commit a5880a9e5b
1 changed files with 8 additions and 16 deletions
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24
drivers/serial/mfd.c
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@ -900,8 +900,7 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
unsigned char cval, fcr = 0;
unsigned long flags;
unsigned int baud, quot;
u32 mul = 0x3600;
u32 ps = 0x10;
u32 ps, mul;
switch (termios->c_cflag & CSIZE) {
case CS5:
@ -943,31 +942,24 @@ serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios,
baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
quot = 1;
ps = 0x10;
mul = 0x3600;
switch (baud) {
case 3500000:
mul = 0x3345;
ps = 0xC;
break;
case 3000000:
mul = 0x2EE0;
break;
case 2500000:
mul = 0x2710;
break;
case 2000000:
mul = 0x1F40;
break;
case 1843200:
mul = 0x2400;
break;
case 3000000:
case 2500000:
case 2000000:
case 1500000:
mul = 0x1770;
break;
case 1000000:
mul = 0xFA0;
break;
case 500000:
mul = 0x7D0;
/* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */
mul = baud / 500000 * 0x9C4;
break;
default:
/* Use uart_get_divisor to get quot for other baud rates */