ARM: SAMSUNG: serial: Add FRACVAL support for newer UART
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>
diff --git a/arch/arm/plat-samsung/include/plat/regs-serial.h b/arch/arm/plat-samsung/include/plat/regs-serial.h
index a6eba84..788837e 100644
--- a/arch/arm/plat-samsung/include/plat/regs-serial.h
+++ b/arch/arm/plat-samsung/include/plat/regs-serial.h
@@ -259,6 +259,8 @@
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 */
diff --git a/drivers/serial/samsung.c b/drivers/serial/samsung.c
index a9d6c56..b1156ba 100644
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -705,8 +705,13 @@
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) {