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authorNobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>2014-07-28 15:07:44 +0900
committerTom Rini <trini@ti.com>2014-08-09 11:17:01 -0400
commit53022c3113a6670d21f55262f511ae6a07bb3dc4 (patch)
tree2a1df6874acffac3d13ef8c2d5064ded1248c501
parent1a223c93240fd4bfaa05cc998b261d9560ca0f09 (diff)
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serial: sh: Add support External Clock mode
R8A7780 and R7A7791 of rmobile supports External Clock mode, and these uses different from Internal Clock mode registers and calculations to the baud rate setting. This adds function for External Clock mode. Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com> Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
-rw-r--r--drivers/serial/serial_sh.c8
-rw-r--r--drivers/serial/serial_sh.h4
2 files changed, 9 insertions, 3 deletions
diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index 0826d59..144a925 100644
--- a/drivers/serial/serial_sh.c
+++ b/drivers/serial/serial_sh.c
@@ -49,9 +49,15 @@ static struct uart_port sh_sci = {
static void sh_serial_setbrg(void)
{
DECLARE_GLOBAL_DATA_PTR;
-
+#ifdef CONFIG_SCIF_USE_EXT_CLK
+ unsigned short dl = DL_VALUE(gd->baudrate, CONFIG_SH_SCIF_CLK_FREQ);
+ sci_out(&sh_sci, DL, dl);
+ /* Need wait: Clock * 1/dl × 1/16 */
+ udelay((1000000 * dl * 16 / CONFIG_SYS_CLK_FREQ) * 1000 + 1);
+#else
sci_out(&sh_sci, SCBRR,
SCBRR_VALUE(gd->baudrate, CONFIG_SH_SCIF_CLK_FREQ));
+#endif
}
static int sh_serial_init(void)
diff --git a/drivers/serial/serial_sh.h b/drivers/serial/serial_sh.h
index 4f3e225..fe8cde4 100644
--- a/drivers/serial/serial_sh.h
+++ b/drivers/serial/serial_sh.h
@@ -735,8 +735,8 @@ static inline int scbrr_calc(struct uart_port port, int bps, int clk)
#elif defined(__H8300H__) || defined(__H8300S__)
#define SCBRR_VALUE(bps, clk) (((clk*1000/32)/bps)-1)
#elif defined(CONFIG_R8A7790) || defined(CONFIG_R8A7791)
-#define SCBRR DL
-#define SCBRR_VALUE(bps, clk) (clk / bps / 16)
+#define DL_VALUE(bps, clk) (clk / bps / 16) /* External Clock */
+#define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1) /* Internal Clock */
#else /* Generic SH */
#define SCBRR_VALUE(bps, clk) ((clk+16*bps)/(32*bps)-1)
#endif