ARM: at91: make pit register base soc independent

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>

1 files changed, 28 insertions, 10 deletions

diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index 4ba85499fa97..d89ead740a99 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -25,7 +25,17 @@
 
 static u32 pit_cycle;           /* write-once */
 static u32 pit_cnt;             /* access only w/system irq blocked */
+static void __iomem *pit_base_addr __read_mostly;
 
+static inline unsigned int pit_read(unsigned int reg_offset)
+{
+        return __raw_readl(pit_base_addr + reg_offset);
+}
+
+static inline void pit_write(unsigned int reg_offset, unsigned long value)
+{
+        __raw_writel(value, pit_base_addr + reg_offset);
+}
 
 /*
  * Clocksource:  just a monotonic counter of MCK/16 cycles.
@@ -39,7 +49,7 @@ static cycle_t read_pit_clk(struct clocksource *cs)
 
         raw_local_irq_save(flags);
         elapsed = pit_cnt;
-        t = at91_sys_read(AT91_PIT_PIIR);
+        t = pit_read(AT91_PIT_PIIR);
         raw_local_irq_restore(flags);
 
         elapsed += PIT_PICNT(t) * pit_cycle;
@@ -64,8 +74,8 @@ pit_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
                 /* update clocksource counter */
-                pit_cnt += pit_cycle * PIT_PICNT(at91_sys_read(AT91_PIT_PIVR));
-                at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN
+                pit_cnt += pit_cycle * PIT_PICNT(pit_read(AT91_PIT_PIVR));
+                pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN
                                 | AT91_PIT_PITIEN);
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
@@ -74,7 +84,7 @@ pit_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
         case CLOCK_EVT_MODE_SHUTDOWN:
         case CLOCK_EVT_MODE_UNUSED:
                 /* disable irq, leaving the clocksource active */
-                at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
+                pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
                 break;
         case CLOCK_EVT_MODE_RESUME:
                 break;
@@ -103,11 +113,11 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)
 
         /* The PIT interrupt may be disabled, and is shared */
         if ((pit_clkevt.mode == CLOCK_EVT_MODE_PERIODIC)
-                        && (at91_sys_read(AT91_PIT_SR) & AT91_PIT_PITS)) {
+                        && (pit_read(AT91_PIT_SR) & AT91_PIT_PITS)) {
                 unsigned nr_ticks;
 
                 /* Get number of ticks performed before irq, and ack it */
-                nr_ticks = PIT_PICNT(at91_sys_read(AT91_PIT_PIVR));
+                nr_ticks = PIT_PICNT(pit_read(AT91_PIT_PIVR));
                 do {
                         pit_cnt += pit_cycle;
                         pit_clkevt.event_handler(&pit_clkevt);
@@ -129,14 +139,14 @@ static struct irqaction at91sam926x_pit_irq = {
 static void at91sam926x_pit_reset(void)
 {
         /* Disable timer and irqs */
-        at91_sys_write(AT91_PIT_MR, 0);
+        pit_write(AT91_PIT_MR, 0);
 
         /* Clear any pending interrupts, wait for PIT to stop counting */
-        while (PIT_CPIV(at91_sys_read(AT91_PIT_PIVR)) != 0)
+        while (PIT_CPIV(pit_read(AT91_PIT_PIVR)) != 0)
                 cpu_relax();
 
         /* Start PIT but don't enable IRQ */
-        at91_sys_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
+        pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
 }
 
 /*
@@ -178,7 +188,15 @@ static void __init at91sam926x_pit_init(void)
 static void at91sam926x_pit_suspend(void)
 {
         /* Disable timer */
-        at91_sys_write(AT91_PIT_MR, 0);
+        pit_write(AT91_PIT_MR, 0);
+}
+
+void __init at91sam926x_ioremap_pit(u32 addr)
+{
+        pit_base_addr = ioremap(addr, 16);
+
+        if (!pit_base_addr)
+                panic("Impossible to ioremap PIT\n");
 }
 
 struct sys_timer at91sam926x_timer = {