serial: 8250_pci: replace switch-case by formula for Intel MID
This patch replaces a switch-case by a formula using rational best
approximation that does necessary calculations for intel_mid_set_termios().
Below is a list of the calculations done for all defined baud rates. Each line
in a format: 1) nominator, 2) denominator, 3) prescaler, 4) Fuart, 5) port UART
clock, 6) list of baud rates with DLAB values.
24 25 12 48000000 64000000 4000000(1)
49 50 14 49000000 56000000 3500000(1)
4 5 16 40000000 40000000 2500000(1)
16 25 16 32000000 32000000 500000(4),1000000(2),2000000(1)
24 25 16 48000000 48000000 1500000(2),3000000(1)
2304 3125 16 36864000 36864000 576000(4),1152000(2)
8192 15625 16 26214400 26214400 50(32768),200(8192)
9216 15625 16 29491200 29491200 1800(1024),57600(32),115200(16),
230400(8),460800(4),921600(2),1843200(1)
12288 15625 16 39321600 39321600 75(32768),150(16384),300(8192),
600(4096),1200(2048),2400(1024),4800(512),
9600(256),19200(128),38400(64)
45056 78125 16 28835840 28835840 110(16384)
274432 390625 16 35127296 35127296 134(16384)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed