clocksource: sh_cmt: Add control register callbacks

This patch adds control register callbacks for the CMT
driver. At this point only 16-bit access is supported
but in the future this will be updated to allow 32-bit
access as well.

Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: John Stultz <john.stultz@linaro.org>
Tested-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index da904d7..7108963 100644 (file)
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -55,6 +55,11 @@ struct sh_cmt_priv {
        unsigned long total_cycles;
        bool cs_enabled;
 
+       /* callbacks for CMSTR and CMCSR access */
+       unsigned long (*read_control)(void __iomem *base, unsigned long offs);
+       void (*write_control)(void __iomem *base, unsigned long offs,
+                             unsigned long value);
+
        /* callbacks for CMCNT and CMCOR access */
        unsigned long (*read_count)(void __iomem *base, unsigned long offs);
        void (*write_count)(void __iomem *base, unsigned long offs,
@@ -91,12 +96,12 @@ static inline unsigned long sh_cmt_read_cmstr(struct sh_cmt_priv *p)
 {
        struct sh_timer_config *cfg = p->pdev->dev.platform_data;
 
-       return sh_cmt_read16(p->mapbase - cfg->channel_offset, 0);
+       return p->read_control(p->mapbase - cfg->channel_offset, 0);
 }
 
 static inline unsigned long sh_cmt_read_cmcsr(struct sh_cmt_priv *p)
 {
-       return sh_cmt_read16(p->mapbase, CMCSR);
+       return p->read_control(p->mapbase, CMCSR);
 }
 
 static inline unsigned long sh_cmt_read_cmcnt(struct sh_cmt_priv *p)
@@ -109,13 +114,13 @@ static inline void sh_cmt_write_cmstr(struct sh_cmt_priv *p,
 {
        struct sh_timer_config *cfg = p->pdev->dev.platform_data;
 
-       sh_cmt_write16(p->mapbase - cfg->channel_offset, 0, value);
+       p->write_control(p->mapbase - cfg->channel_offset, 0, value);
 }
 
 static inline void sh_cmt_write_cmcsr(struct sh_cmt_priv *p,
                                      unsigned long value)
 {
-       sh_cmt_write16(p->mapbase, CMCSR, value);
+       p->write_control(p->mapbase, CMCSR, value);
 }
 
 static inline void sh_cmt_write_cmcnt(struct sh_cmt_priv *p,
@@ -702,6 +707,9 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev)
                goto err1;
        }
 
+       p->read_control = sh_cmt_read16;
+       p->write_control = sh_cmt_write16;
+
        if (resource_size(res) == 6) {
                p->width = 16;
                p->read_count = sh_cmt_read16;