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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-06-29 15:15:54 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-06-29 15:15:54 +0100
commitb720f73296916e87c744193c57bc8687d35888fe (patch)
tree0fba1e98b336929a8f8c4d20d6a82714b7106c98 /arch/arm/mach-integrator
parent6904b2465cf30265a67711025815784aa345bfad (diff)
downloadop-kernel-dev-b720f73296916e87c744193c57bc8687d35888fe.zip
op-kernel-dev-b720f73296916e87c744193c57bc8687d35888fe.tar.gz
[PATCH] ARM: Convert ARM timer implementations to use readl/writel
Convert ARMs timer implementations to use readl/writel instead of accessing the registers via a struct. People have recently asked if accessing timers via a structure is the "right way" and its not the Linux way. So fix this code to conform to "The Linux Way"(tm). Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/mach-integrator')
-rw-r--r--arch/arm/mach-integrator/core.c42
1 files changed, 14 insertions, 28 deletions
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
index 9222e57..797c7fd 100644
--- a/arch/arm/mach-integrator/core.c
+++ b/arch/arm/mach-integrator/core.c
@@ -20,6 +20,7 @@
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/hardware/amba.h>
+#include <asm/hardware/arm_timer.h>
#include <asm/arch/cm.h>
#include <asm/system.h>
#include <asm/leds.h>
@@ -156,16 +157,6 @@ EXPORT_SYMBOL(cm_control);
#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
#endif
-/*
- * What does it look like?
- */
-typedef struct TimerStruct {
- unsigned long TimerLoad;
- unsigned long TimerValue;
- unsigned long TimerControl;
- unsigned long TimerClear;
-} TimerStruct_t;
-
static unsigned long timer_reload;
/*
@@ -174,7 +165,6 @@ static unsigned long timer_reload;
*/
unsigned long integrator_gettimeoffset(void)
{
- volatile TimerStruct_t *timer1 = (TimerStruct_t *)TIMER1_VA_BASE;
unsigned long ticks1, ticks2, status;
/*
@@ -183,11 +173,11 @@ unsigned long integrator_gettimeoffset(void)
* an interrupt. We get around this by ensuring that the
* counter has not reloaded between our two reads.
*/
- ticks2 = timer1->TimerValue & 0xffff;
+ ticks2 = readl(TIMER1_VA_BASE + TIMER_VALUE) & 0xffff;
do {
ticks1 = ticks2;
status = __raw_readl(VA_IC_BASE + IRQ_RAW_STATUS);
- ticks2 = timer1->TimerValue & 0xffff;
+ ticks2 = readl(TIMER1_VA_BASE + TIMER_VALUE) & 0xffff;
} while (ticks2 > ticks1);
/*
@@ -213,20 +203,19 @@ unsigned long integrator_gettimeoffset(void)
static irqreturn_t
integrator_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
- volatile TimerStruct_t *timer1 = (volatile TimerStruct_t *)TIMER1_VA_BASE;
-
write_seqlock(&xtime_lock);
/*
* clear the interrupt
*/
- timer1->TimerClear = 1;
+ writel(1, TIMER1_VA_BASE + TIMER_INTCLR);
/*
* the clock tick routines are only processed on the
* primary CPU
*/
if (hard_smp_processor_id() == 0) {
+ nmi_tick();
timer_tick(regs);
#ifdef CONFIG_SMP
smp_send_timer();
@@ -256,32 +245,29 @@ static struct irqaction integrator_timer_irq = {
*/
void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
{
- volatile TimerStruct_t *timer0 = (volatile TimerStruct_t *)TIMER0_VA_BASE;
- volatile TimerStruct_t *timer1 = (volatile TimerStruct_t *)TIMER1_VA_BASE;
- volatile TimerStruct_t *timer2 = (volatile TimerStruct_t *)TIMER2_VA_BASE;
- unsigned int timer_ctrl = 0x80 | 0x40; /* periodic */
+ unsigned int timer_ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;
timer_reload = reload;
timer_ctrl |= ctrl;
if (timer_reload > 0x100000) {
timer_reload >>= 8;
- timer_ctrl |= 0x08; /* /256 */
+ timer_ctrl |= TIMER_CTRL_DIV256;
} else if (timer_reload > 0x010000) {
timer_reload >>= 4;
- timer_ctrl |= 0x04; /* /16 */
+ timer_ctrl |= TIMER_CTRL_DIV16;
}
/*
* Initialise to a known state (all timers off)
*/
- timer0->TimerControl = 0;
- timer1->TimerControl = 0;
- timer2->TimerControl = 0;
+ writel(0, TIMER0_VA_BASE + TIMER_CTRL);
+ writel(0, TIMER1_VA_BASE + TIMER_CTRL);
+ writel(0, TIMER2_VA_BASE + TIMER_CTRL);
- timer1->TimerLoad = timer_reload;
- timer1->TimerValue = timer_reload;
- timer1->TimerControl = timer_ctrl;
+ writel(timer_reload, TIMER1_VA_BASE + TIMER_LOAD);
+ writel(timer_reload, TIMER1_VA_BASE + TIMER_VALUE);
+ writel(timer_ctrl, TIMER1_VA_BASE + TIMER_CTRL);
/*
* Make irqs happen for the system timer
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