[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>

1 files changed, 14 insertions, 28 deletions

diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
index 9222e57bd872..797c7fddaa0d 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