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authorHaojian Zhuang <haojian.zhuang@gmail.com>2012-04-12 19:05:40 +0800
committerHaojian Zhuang <haojian.zhuang@gmail.com>2012-05-05 16:36:01 +0800
commitc68ef2b5921cf26225533c8ed109386578060a98 (patch)
tree80fb3067584a76b937f580fe68c5837e58a43c4a /arch/arm/mach-mmp
parentc24b31147a0615abd6f15c9e2b6349191860db35 (diff)
ARM: mmp: support DT in timer
Parse timer from DTS file. Avoid to use hardcoding marco for register. Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-mmp')
-rw-r--r--arch/arm/mach-mmp/time.c81
1 files changed, 60 insertions, 21 deletions
diff --git a/arch/arm/mach-mmp/time.c b/arch/arm/mach-mmp/time.c
index 71fc4ee4602..936447c7097 100644
--- a/arch/arm/mach-mmp/time.c
+++ b/arch/arm/mach-mmp/time.c
@@ -25,6 +25,9 @@
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <asm/sched_clock.h>
#include <mach/addr-map.h>
@@ -41,6 +44,8 @@
#define MAX_DELTA (0xfffffffe)
#define MIN_DELTA (16)
+static void __iomem *mmp_timer_base = TIMERS_VIRT_BASE;
+
/*
* FIXME: the timer needs some delay to stablize the counter capture
*/
@@ -48,12 +53,12 @@ static inline uint32_t timer_read(void)
{
int delay = 100;
- __raw_writel(1, TIMERS_VIRT_BASE + TMR_CVWR(1));
+ __raw_writel(1, mmp_timer_base + TMR_CVWR(1));
while (delay--)
cpu_relax();
- return __raw_readl(TIMERS_VIRT_BASE + TMR_CVWR(1));
+ return __raw_readl(mmp_timer_base + TMR_CVWR(1));
}
static u32 notrace mmp_read_sched_clock(void)
@@ -68,12 +73,12 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
/*
* Clear pending interrupt status.
*/
- __raw_writel(0x01, TIMERS_VIRT_BASE + TMR_ICR(0));
+ __raw_writel(0x01, mmp_timer_base + TMR_ICR(0));
/*
* Disable timer 0.
*/
- __raw_writel(0x02, TIMERS_VIRT_BASE + TMR_CER);
+ __raw_writel(0x02, mmp_timer_base + TMR_CER);
c->event_handler(c);
@@ -90,23 +95,23 @@ static int timer_set_next_event(unsigned long delta,
/*
* Disable timer 0.
*/
- __raw_writel(0x02, TIMERS_VIRT_BASE + TMR_CER);
+ __raw_writel(0x02, mmp_timer_base + TMR_CER);
/*
* Clear and enable timer match 0 interrupt.
*/
- __raw_writel(0x01, TIMERS_VIRT_BASE + TMR_ICR(0));
- __raw_writel(0x01, TIMERS_VIRT_BASE + TMR_IER(0));
+ __raw_writel(0x01, mmp_timer_base + TMR_ICR(0));
+ __raw_writel(0x01, mmp_timer_base + TMR_IER(0));
/*
* Setup new clockevent timer value.
*/
- __raw_writel(delta - 1, TIMERS_VIRT_BASE + TMR_TN_MM(0, 0));
+ __raw_writel(delta - 1, mmp_timer_base + TMR_TN_MM(0, 0));
/*
* Enable timer 0.
*/
- __raw_writel(0x03, TIMERS_VIRT_BASE + TMR_CER);
+ __raw_writel(0x03, mmp_timer_base + TMR_CER);
local_irq_restore(flags);
@@ -124,7 +129,7 @@ static void timer_set_mode(enum clock_event_mode mode,
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
/* disable the matching interrupt */
- __raw_writel(0x00, TIMERS_VIRT_BASE + TMR_IER(0));
+ __raw_writel(0x00, mmp_timer_base + TMR_IER(0));
break;
case CLOCK_EVT_MODE_RESUME:
case CLOCK_EVT_MODE_PERIODIC:
@@ -157,27 +162,27 @@ static struct clocksource cksrc = {
static void __init timer_config(void)
{
- uint32_t ccr = __raw_readl(TIMERS_VIRT_BASE + TMR_CCR);
+ uint32_t ccr = __raw_readl(mmp_timer_base + TMR_CCR);
- __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_CER); /* disable */
+ __raw_writel(0x0, mmp_timer_base + TMR_CER); /* disable */
ccr &= (cpu_is_mmp2()) ? (TMR_CCR_CS_0(0) | TMR_CCR_CS_1(0)) :
(TMR_CCR_CS_0(3) | TMR_CCR_CS_1(3));
- __raw_writel(ccr, TIMERS_VIRT_BASE + TMR_CCR);
+ __raw_writel(ccr, mmp_timer_base + TMR_CCR);
/* set timer 0 to periodic mode, and timer 1 to free-running mode */
- __raw_writel(0x2, TIMERS_VIRT_BASE + TMR_CMR);
+ __raw_writel(0x2, mmp_timer_base + TMR_CMR);
- __raw_writel(0x1, TIMERS_VIRT_BASE + TMR_PLCR(0)); /* periodic */
- __raw_writel(0x7, TIMERS_VIRT_BASE + TMR_ICR(0)); /* clear status */
- __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_IER(0));
+ __raw_writel(0x1, mmp_timer_base + TMR_PLCR(0)); /* periodic */
+ __raw_writel(0x7, mmp_timer_base + TMR_ICR(0)); /* clear status */
+ __raw_writel(0x0, mmp_timer_base + TMR_IER(0));
- __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_PLCR(1)); /* free-running */
- __raw_writel(0x7, TIMERS_VIRT_BASE + TMR_ICR(1)); /* clear status */
- __raw_writel(0x0, TIMERS_VIRT_BASE + TMR_IER(1));
+ __raw_writel(0x0, mmp_timer_base + TMR_PLCR(1)); /* free-running */
+ __raw_writel(0x7, mmp_timer_base + TMR_ICR(1)); /* clear status */
+ __raw_writel(0x0, mmp_timer_base + TMR_IER(1));
/* enable timer 1 counter */
- __raw_writel(0x2, TIMERS_VIRT_BASE + TMR_CER);
+ __raw_writel(0x2, mmp_timer_base + TMR_CER);
}
static struct irqaction timer_irq = {
@@ -203,3 +208,37 @@ void __init timer_init(int irq)
clocksource_register_hz(&cksrc, CLOCK_TICK_RATE);
clockevents_register_device(&ckevt);
}
+
+#ifdef CONFIG_OF
+static struct of_device_id mmp_timer_dt_ids[] = {
+ { .compatible = "mrvl,mmp-timer", },
+ {}
+};
+
+void __init mmp_dt_init_timer(void)
+{
+ struct device_node *np;
+ int irq, ret;
+
+ np = of_find_matching_node(NULL, mmp_timer_dt_ids);
+ if (!np) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ irq = irq_of_parse_and_map(np, 0);
+ if (!irq) {
+ ret = -EINVAL;
+ goto out;
+ }
+ mmp_timer_base = of_iomap(np, 0);
+ if (!mmp_timer_base) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ timer_init(irq);
+ return;
+out:
+ pr_err("Failed to get timer from device tree with error:%d\n", ret);
+}
+#endif