From: Changhwan Youn <chaos.youn@xxxxxxxxxxx>
FRACVAL register provides the same function as UDIVSLOT register which is
the 1/16ths adjustment to the baud rate but the implementaiton is easier.
To support UDIVSLOT register, UDIVSLOT table search is necessary though
supporting FRACVAL only needs the index value of UDIVSLOT table.
This patch implements the FRACVAL supports for the newer Samsung SoC UARTs.
Signed-off-by: Changhwan Youn <chaos.youn@xxxxxxxxxxx>
Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
---
drivers/serial/samsung.c | 7 +++++--
drivers/serial/samsung.h | 1 +
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index a9d6c56..09805c7 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -530,7 +530,7 @@ static int s3c24xx_serial_calcbaud(struct baud_calc *calc,
calc->clksrc = clksrc;
- if (ourport->info->has_divslot) {
+ if ((ourport->info->has_divslot) || (ourport->info->has_fracval)) {
unsigned long div = rate / baud;
/* The UDIVSLOT register on the newer UARTs allows us to
@@ -707,6 +707,9 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
udivslot = udivslot_table[div & 15];
dbg("udivslot = %04x (div %d)\n", udivslot, div & 15);
+ } else if (ourport->info->has_fracval) {
+ udivslot = (ourport->baudclk_rate / baud) & 15;
+ dbg("fracval = %04x\n", udivslot);
}
switch (termios->c_cflag & CSIZE) {
@@ -755,7 +758,7 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
wr_regl(port, S3C2410_UBRDIV, quot);
wr_regl(port, S3C2410_UMCON, umcon);
- if (ourport->info->has_divslot)
+ if ((ourport->info->has_divslot) || (ourport->info->has_fracval))
wr_regl(port, S3C2443_DIVSLOT, udivslot);
dbg("uart: ulcon = 0x%08x, ucon = 0x%08x, ufcon = 0x%08x\n",
diff --git a/drivers/serial/samsung.h b/drivers/serial/samsung.h
index 0ac06a0..124f476 100644
--- a/drivers/serial/samsung.h
+++ b/drivers/serial/samsung.h
@@ -24,6 +24,7 @@ struct s3c24xx_uart_info {
/* uart port features */
unsigned int has_divslot:1;
+ unsigned int has_fracval:1;
/* clock source control */
--
1.6.2.5
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
