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Diffstat (limited to 'arch/arm/mach-at91/at91sam926x_time.c')
-rw-r--r--arch/arm/mach-at91/at91sam926x_time.c38
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 4ba85499fa9..d89ead740a9 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 = {