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Date: Fri, 14 Dec 2012 14:54:19 +0900
From: Magnus Damm <magnus.damm@...il.com>
To: linux-kernel@...r.kernel.org
Cc: linux-sh@...r.kernel.org, johnstul@...ibm.com, horms@...ge.net.au,
shinya.kuribayashi.px@...esas.com,
Magnus Damm <magnus.damm@...il.com>, tglx@...utronix.de
Subject: [PATCH 06/08] clocksource: sh_cmt: CMCNT and CMCOR register access update
From: Magnus Damm <damm@...nsource.se>
Break out the CMCNT and CMCOR register access code
into separate 16-bit and 32-bit functions that are
hooked into callbacks at init time. This reduces
the amount of software calculations happening at
runtime.
Signed-off-by: Magnus Damm <damm@...nsource.se>
---
drivers/clocksource/sh_cmt.c | 62 +++++++++++++++++-------------------------
1 file changed, 26 insertions(+), 36 deletions(-)
--- 0006/drivers/clocksource/sh_cmt.c
+++ work/drivers/clocksource/sh_cmt.c 2012-12-14 13:00:20.000000000 +0900
@@ -54,38 +54,39 @@ struct sh_cmt_priv {
struct clocksource cs;
unsigned long total_cycles;
bool cs_enabled;
+
+ /* 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,
+ unsigned long value);
};
-static inline unsigned long sh_cmt_read16(void __iomem *base,
- unsigned long offs)
+static unsigned long sh_cmt_read16(void __iomem *base, unsigned long offs)
{
return ioread16(base + (offs << 1));
}
-static inline void sh_cmt_write16(void __iomem *base, unsigned long offs,
- unsigned long value)
+static unsigned long sh_cmt_read32(void __iomem *base, unsigned long offs)
+{
+ return ioread32(base + (offs << 2));
+}
+
+static void sh_cmt_write16(void __iomem *base, unsigned long offs,
+ unsigned long value)
{
iowrite16(value, base + (offs << 1));
}
+static void sh_cmt_write32(void __iomem *base, unsigned long offs,
+ unsigned long value)
+{
+ iowrite32(value, base + (offs << 2));
+}
+
#define CMCSR 0 /* channel register */
#define CMCNT 1 /* channel register */
#define CMCOR 2 /* channel register */
-static inline unsigned long sh_cmt_read(struct sh_cmt_priv *p, int reg_nr)
-{
- void __iomem *base = p->mapbase;
- unsigned long offs = reg_nr;
-
- if (p->width == 16) {
- offs <<= 1;
- return ioread16(base + offs);
- } else {
- offs <<= 2;
- return ioread32(base + offs);
- }
-}
-
static inline unsigned long sh_cmt_read_cmstr(struct sh_cmt_priv *p)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
@@ -100,22 +101,7 @@ static inline unsigned long sh_cmt_read_
static inline unsigned long sh_cmt_read_cmcnt(struct sh_cmt_priv *p)
{
- return sh_cmt_read(p, CMCNT);
-}
-
-static inline void sh_cmt_write(struct sh_cmt_priv *p, int reg_nr,
- unsigned long value)
-{
- void __iomem *base = p->mapbase;
- unsigned long offs = reg_nr;
-
- if (p->width == 16) {
- offs <<= 1;
- iowrite16(value, base + offs);
- } else {
- offs <<= 2;
- iowrite32(value, base + offs);
- }
+ return p->read_count(p->mapbase, CMCNT);
}
static inline void sh_cmt_write_cmstr(struct sh_cmt_priv *p,
@@ -135,13 +121,13 @@ static inline void sh_cmt_write_cmcsr(st
static inline void sh_cmt_write_cmcnt(struct sh_cmt_priv *p,
unsigned long value)
{
- sh_cmt_write(p, CMCNT, value);
+ p->write_count(p->mapbase, CMCNT, value);
}
static inline void sh_cmt_write_cmcor(struct sh_cmt_priv *p,
unsigned long value)
{
- sh_cmt_write(p, CMCOR, value);
+ p->write_count(p->mapbase, CMCOR, value);
}
static unsigned long sh_cmt_get_counter(struct sh_cmt_priv *p,
@@ -718,10 +704,14 @@ static int sh_cmt_setup(struct sh_cmt_pr
if (resource_size(res) == 6) {
p->width = 16;
+ p->read_count = sh_cmt_read16;
+ p->write_count = sh_cmt_write16;
p->overflow_bit = 0x80;
p->clear_bits = ~0x80;
} else {
p->width = 32;
+ p->read_count = sh_cmt_read32;
+ p->write_count = sh_cmt_write32;
p->overflow_bit = 0x8000;
p->clear_bits = ~0xc000;
}
--
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