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ARM: SAMSUNG: serial: Add FRACVAL support for newer UART

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Add support for the FRACVAL register on the newer UART blocks which provides
the same function as UDIVSLOT register but the FRACVAL is easier to implement.
To support UDIVSLOT register, UDIVSLOT table search is necessary though
supporting FRACVAL only needs the index value of UDIVSLOT table.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Acked-by: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Jongpill Lee 2010-07-16 10:19:41 +09:00 committed by Kukjin Kim
parent 9fe6206f40
commit 8b526ae4dd
2 changed files with 9 additions and 2 deletions
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2
arch/arm/plat-samsung/include/plat/regs-serial.h
View File

@ -259,6 +259,8 @@ struct s3c2410_uartcfg {
unsigned short flags;
upf_t uart_flags; /* default uart flags */
unsigned int has_fracval;
unsigned long ucon; /* value of ucon for port */
unsigned long ulcon; /* value of ulcon for port */
unsigned long ufcon; /* value of ufcon for port */

9
drivers/serial/samsung.c
View File

@ -705,8 +705,13 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
if (ourport->info->has_divslot) {
unsigned int div = ourport->baudclk_rate / baud;
udivslot = udivslot_table[div & 15];
dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
if (cfg->has_fracval) {
udivslot = (div & 15);
dbg("fracval = %04x\n", udivslot);
} else {
udivslot = udivslot_table[div & 15];
dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
}
}
switch (termios->c_cflag & CSIZE) {