[PATCH V3 04/11] ARM: set arch_gettimeoffset directly
Stephen Warren
swarren at wwwdotorg.org
Mon Nov 19 13:31:00 EST 2012
From: Stephen Warren <swarren at nvidia.com>
remove ARM's struct sys_timer .offset function pointer, and instead
directly set the arch_gettimeoffset function pointer when the timer
driver is initialized. This requires multiplying all function results
by 1000, since the removed arm_gettimeoffset() did this. Also,
s/unsigned long/u32/ just to make the function prototypes exactly
match that of arch_gettimeoffset.
Cc: Russell King <linux at arm.linux.org.uk>
Cc: Andrew Victor <linux at maxim.org.za>
Cc: Nicolas Ferre <nicolas.ferre at atmel.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj at jcrosoft.com>
Cc: Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ryan Mallon <rmallon at gmail.com>
Cc: Ben Dooks <ben-linux at fluff.org>
Cc: Kukjin Kim <kgene.kim at samsung.com>
Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
v2: Fix comment in ep93xx_gettimeoffset.
---
arch/arm/include/asm/mach/time.h | 3 ---
arch/arm/kernel/time.c | 14 --------------
arch/arm/mach-at91/at91x40_time.c | 8 +++++---
arch/arm/mach-ebsa110/core.c | 7 ++++---
arch/arm/mach-ep93xx/core.c | 29 ++++++++++++++++++-----------
arch/arm/mach-h720x/common.c | 6 +++---
arch/arm/mach-h720x/common.h | 2 +-
arch/arm/mach-h720x/cpu-h7201.c | 3 ++-
arch/arm/mach-h720x/cpu-h7202.c | 3 ++-
arch/arm/mach-rpc/time.c | 6 +++---
arch/arm/plat-samsung/time.c | 7 ++++---
11 files changed, 42 insertions(+), 46 deletions(-)
diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index 6ca945f..cac8d9c 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -35,9 +35,6 @@ struct sys_timer {
void (*init)(void);
void (*suspend)(void);
void (*resume)(void);
-#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
- unsigned long (*offset)(void);
-#endif
};
extern void timer_tick(void);
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index b0190b4..ea36bfa 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -69,16 +69,6 @@ unsigned long profile_pc(struct pt_regs *regs)
EXPORT_SYMBOL(profile_pc);
#endif
-#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
-static u32 arm_gettimeoffset(void)
-{
- if (system_timer->offset != NULL)
- return system_timer->offset() * 1000;
-
- return 0;
-}
-#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
-
#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
* Kernel system timer support.
@@ -164,10 +154,6 @@ device_initcall(timer_init_syscore_ops);
void __init time_init(void)
{
-#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
- arch_gettimeoffset = arm_gettimeoffset;
-#endif
-
system_timer = machine_desc->timer;
system_timer->init();
sched_clock_postinit();
diff --git a/arch/arm/mach-at91/at91x40_time.c b/arch/arm/mach-at91/at91x40_time.c
index 0e57e44..fb3c701 100644
--- a/arch/arm/mach-at91/at91x40_time.c
+++ b/arch/arm/mach-at91/at91x40_time.c
@@ -42,9 +42,10 @@
#define AT91_TC_CLK1BASE 0x40
#define AT91_TC_CLK2BASE 0x80
-static unsigned long at91x40_gettimeoffset(void)
+static u32 at91x40_gettimeoffset(void)
{
- return (at91_tc_read(AT91_TC_CLK1BASE + AT91_TC_CV) * 1000000 / (AT91X40_MASTER_CLOCK / 128));
+ return (at91_tc_read(AT91_TC_CLK1BASE + AT91_TC_CV) * 1000000 /
+ (AT91X40_MASTER_CLOCK / 128)) * 1000;
}
static irqreturn_t at91x40_timer_interrupt(int irq, void *dev_id)
@@ -64,6 +65,8 @@ void __init at91x40_timer_init(void)
{
unsigned int v;
+ arch_gettimeoffset = at91x40_gettimeoffset;
+
at91_tc_write(AT91_TC_BCR, 0);
v = at91_tc_read(AT91_TC_BMR);
v = (v & ~AT91_TC_TC1XC1S) | AT91_TC_TC1XC1S_NONE;
@@ -82,6 +85,5 @@ void __init at91x40_timer_init(void)
struct sys_timer at91x40_timer = {
.init = at91x40_timer_init,
- .offset = at91x40_gettimeoffset,
};
diff --git a/arch/arm/mach-ebsa110/core.c b/arch/arm/mach-ebsa110/core.c
index f0fe6b5..d96dd94 100644
--- a/arch/arm/mach-ebsa110/core.c
+++ b/arch/arm/mach-ebsa110/core.c
@@ -158,7 +158,7 @@ static void __init ebsa110_init_early(void)
* interrupt, then the PIT counter will roll over (ie, be negative).
* This actually works out to be convenient.
*/
-static unsigned long ebsa110_gettimeoffset(void)
+static u32 ebsa110_gettimeoffset(void)
{
unsigned long offset, count;
@@ -181,7 +181,7 @@ static unsigned long ebsa110_gettimeoffset(void)
*/
offset = offset * (1000000 / HZ) / COUNT;
- return offset;
+ return offset * 1000;
}
static irqreturn_t
@@ -215,6 +215,8 @@ static struct irqaction ebsa110_timer_irq = {
*/
static void __init ebsa110_timer_init(void)
{
+ arch_gettimeoffset = ebsa110_gettimeoffset;
+
/*
* Timer 1, mode 2, LSB/MSB
*/
@@ -227,7 +229,6 @@ static void __init ebsa110_timer_init(void)
static struct sys_timer ebsa110_timer = {
.init = ebsa110_timer_init,
- .offset = ebsa110_gettimeoffset,
};
static struct plat_serial8250_port serial_platform_data[] = {
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index e85bf17..6f48b87 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -140,11 +140,29 @@ static struct irqaction ep93xx_timer_irq = {
.handler = ep93xx_timer_interrupt,
};
+static u32 ep93xx_gettimeoffset(void)
+{
+ int offset;
+
+ offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time;
+
+ /*
+ * Timer 4 is based on a 983.04 kHz reference clock,
+ * so dividing by 983040 gives the fraction of a second,
+ * so dividing by 0.983040 converts to uS.
+ * Refactor the calculation to avoid overflow.
+ * Finally, multiply by 1000 to give nS.
+ */
+ return (offset + (53 * offset / 3072)) * 1000;
+}
+
static void __init ep93xx_timer_init(void)
{
u32 tmode = EP93XX_TIMER123_CONTROL_MODE |
EP93XX_TIMER123_CONTROL_CLKSEL;
+ arch_gettimeoffset = ep93xx_gettimeoffset;
+
/* Enable periodic HZ timer. */
__raw_writel(tmode, EP93XX_TIMER1_CONTROL);
__raw_writel(TIMER1_RELOAD, EP93XX_TIMER1_LOAD);
@@ -158,19 +176,8 @@ static void __init ep93xx_timer_init(void)
setup_irq(IRQ_EP93XX_TIMER1, &ep93xx_timer_irq);
}
-static unsigned long ep93xx_gettimeoffset(void)
-{
- int offset;
-
- offset = __raw_readl(EP93XX_TIMER4_VALUE_LOW) - last_jiffy_time;
-
- /* Calculate (1000000 / 983040) * offset. */
- return offset + (53 * offset / 3072);
-}
-
struct sys_timer ep93xx_timer = {
.init = ep93xx_timer_init,
- .offset = ep93xx_gettimeoffset,
};
diff --git a/arch/arm/mach-h720x/common.c b/arch/arm/mach-h720x/common.c
index aa1331e..17ef91f 100644
--- a/arch/arm/mach-h720x/common.c
+++ b/arch/arm/mach-h720x/common.c
@@ -42,12 +42,12 @@ void __init arch_dma_init(dma_t *dma)
}
/*
- * Return usecs since last timer reload
+ * Return nsecs since last timer reload
* (timercount * (usecs perjiffie)) / (ticks per jiffie)
*/
-unsigned long h720x_gettimeoffset(void)
+u32 h720x_gettimeoffset(void)
{
- return (CPU_REG (TIMER_VIRT, TM0_COUNT) * tick_usec) / LATCH;
+ return ((CPU_REG(TIMER_VIRT, TM0_COUNT) * tick_usec) / LATCH) * 1000;
}
/*
diff --git a/arch/arm/mach-h720x/common.h b/arch/arm/mach-h720x/common.h
index 2489537..79cfb97 100644
--- a/arch/arm/mach-h720x/common.h
+++ b/arch/arm/mach-h720x/common.h
@@ -13,7 +13,7 @@
*
*/
-extern unsigned long h720x_gettimeoffset(void);
+extern u32 h720x_gettimeoffset(void);
extern void __init h720x_init_irq(void);
extern void __init h720x_map_io(void);
extern void h720x_restart(char, const char *);
diff --git a/arch/arm/mach-h720x/cpu-h7201.c b/arch/arm/mach-h720x/cpu-h7201.c
index 24df2a3..ba349cf 100644
--- a/arch/arm/mach-h720x/cpu-h7201.c
+++ b/arch/arm/mach-h720x/cpu-h7201.c
@@ -46,6 +46,8 @@ static struct irqaction h7201_timer_irq = {
*/
void __init h7201_init_time(void)
{
+ arch_gettimeoffset = h720x_gettimeoffset;
+
CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;
@@ -56,5 +58,4 @@ void __init h7201_init_time(void)
struct sys_timer h7201_timer = {
.init = h7201_init_time,
- .offset = h720x_gettimeoffset,
};
diff --git a/arch/arm/mach-h720x/cpu-h7202.c b/arch/arm/mach-h720x/cpu-h7202.c
index c37d570..fb9ca76 100644
--- a/arch/arm/mach-h720x/cpu-h7202.c
+++ b/arch/arm/mach-h720x/cpu-h7202.c
@@ -180,6 +180,8 @@ static struct irqaction h7202_timer_irq = {
*/
void __init h7202_init_time(void)
{
+ arch_gettimeoffset = h720x_gettimeoffset;
+
CPU_REG (TIMER_VIRT, TM0_PERIOD) = LATCH;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_RESET;
CPU_REG (TIMER_VIRT, TM0_CTRL) = TM_REPEAT | TM_START;
@@ -190,7 +192,6 @@ void __init h7202_init_time(void)
struct sys_timer h7202_timer = {
.init = h7202_init_time,
- .offset = h720x_gettimeoffset,
};
void __init h7202_init_irq (void)
diff --git a/arch/arm/mach-rpc/time.c b/arch/arm/mach-rpc/time.c
index 581fca9..6ddccb0 100644
--- a/arch/arm/mach-rpc/time.c
+++ b/arch/arm/mach-rpc/time.c
@@ -24,7 +24,7 @@
#include <asm/mach/time.h>
-unsigned long ioc_timer_gettimeoffset(void)
+static u32 ioc_timer_gettimeoffset(void)
{
unsigned int count1, count2, status;
long offset;
@@ -56,7 +56,7 @@ unsigned long ioc_timer_gettimeoffset(void)
}
offset = (LATCH - offset) * (tick_nsec / 1000);
- return (offset + LATCH/2) / LATCH;
+ return ((offset + LATCH/2) / LATCH) * 1000;
}
void __init ioctime_init(void)
@@ -84,12 +84,12 @@ static struct irqaction ioc_timer_irq = {
*/
static void __init ioc_timer_init(void)
{
+ arch_gettimeoffset = ioc_timer_gettimeoffset;
ioctime_init();
setup_irq(IRQ_TIMER0, &ioc_timer_irq);
}
struct sys_timer ioc_timer = {
.init = ioc_timer_init,
- .offset = ioc_timer_gettimeoffset,
};
diff --git a/arch/arm/plat-samsung/time.c b/arch/arm/plat-samsung/time.c
index 60552e2..67206df 100644
--- a/arch/arm/plat-samsung/time.c
+++ b/arch/arm/plat-samsung/time.c
@@ -95,7 +95,7 @@ static inline unsigned long timer_ticks_to_usec(unsigned long ticks)
* IRQs are disabled before entering here from do_gettimeofday()
*/
-static unsigned long s3c2410_gettimeoffset (void)
+static u32 s3c2410_gettimeoffset(void)
{
unsigned long tdone;
unsigned long tval;
@@ -120,7 +120,7 @@ static unsigned long s3c2410_gettimeoffset (void)
tdone += timer_startval;
}
- return timer_ticks_to_usec(tdone);
+ return timer_ticks_to_usec(tdone) * 1000;
}
@@ -273,6 +273,8 @@ static void __init s3c2410_timer_resources(void)
static void __init s3c2410_timer_init(void)
{
+ arch_gettimeoffset = s3c2410_gettimeoffset;
+
s3c2410_timer_resources();
s3c2410_timer_setup();
setup_irq(IRQ_TIMER4, &s3c2410_timer_irq);
@@ -280,6 +282,5 @@ static void __init s3c2410_timer_init(void)
struct sys_timer s3c24xx_timer = {
.init = s3c2410_timer_init,
- .offset = s3c2410_gettimeoffset,
.resume = s3c2410_timer_setup
};
--
1.7.10.4
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