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serial: sh: Add support External Clock mode

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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>
This commit is contained in:
Nobuhiro Iwamatsu 2014-07-28 15:07:44 +09:00 committed by Tom Rini
parent 1a223c9324
commit 53022c3113
2 changed files with 9 additions and 3 deletions
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8
drivers/serial/serial_sh.c
View File

@ -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 $B!_(B 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)

4
drivers/serial/serial_sh.h
View File

@ -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