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Diffstat (limited to 'arch/arm/mach-vt8500/timer.c')
-rw-r--r--arch/arm/mach-vt8500/timer.c67
1 files changed, 48 insertions, 19 deletions
diff --git a/arch/arm/mach-vt8500/timer.c b/arch/arm/mach-vt8500/timer.c
index d5376c592ab..050e1833f2d 100644
--- a/arch/arm/mach-vt8500/timer.c
+++ b/arch/arm/mach-vt8500/timer.c
@@ -1,6 +1,7 @@
/*
- * arch/arm/mach-vt8500/timer.c
+ * arch/arm/mach-vt8500/timer_dt.c
*
+ * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
@@ -18,18 +19,25 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+/*
+ * This file is copied and modified from the original timer.c provided by
+ * Alexey Charkov. Minor changes have been made for Device Tree Support.
+ */
+
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/delay.h>
-
#include <asm/mach/time.h>
-#include "devices.h"
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#define VT8500_TIMER_OFFSET 0x0100
+#define VT8500_TIMER_HZ 3000000
#define TIMER_MATCH_VAL 0x0000
#define TIMER_COUNT_VAL 0x0010
#define TIMER_STATUS_VAL 0x0014
@@ -39,7 +47,6 @@
#define TIMER_COUNT_R_ACTIVE (1 << 5) /* not ready for read */
#define TIMER_COUNT_W_ACTIVE (1 << 4) /* not ready for write */
#define TIMER_MATCH_W_ACTIVE (1 << 0) /* not ready for write */
-#define VT8500_TIMER_HZ 3000000
#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
@@ -55,7 +62,7 @@ static cycle_t vt8500_timer_read(struct clocksource *cs)
return readl(regbase + TIMER_COUNT_VAL);
}
-struct clocksource clocksource = {
+static struct clocksource clocksource = {
.name = "vt8500_timer",
.rating = 200,
.read = vt8500_timer_read,
@@ -98,7 +105,7 @@ static void vt8500_timer_set_mode(enum clock_event_mode mode,
}
}
-struct clock_event_device clockevent = {
+static struct clock_event_device clockevent = {
.name = "vt8500_timer",
.features = CLOCK_EVT_FEAT_ONESHOT,
.rating = 200,
@@ -115,26 +122,51 @@ static irqreturn_t vt8500_timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
-struct irqaction irq = {
+static struct irqaction irq = {
.name = "vt8500_timer",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = vt8500_timer_interrupt,
.dev_id = &clockevent,
};
-static void __init vt8500_timer_init(void)
+static struct of_device_id vt8500_timer_ids[] = {
+ { .compatible = "via,vt8500-timer" },
+ { }
+};
+
+void __init vt8500_timer_init(void)
{
- regbase = ioremap(wmt_pmc_base + VT8500_TIMER_OFFSET, 0x28);
- if (!regbase)
- printk(KERN_ERR "vt8500_timer_init: failed to map MMIO registers\n");
+ struct device_node *np;
+ int timer_irq;
+
+ np = of_find_matching_node(NULL, vt8500_timer_ids);
+ if (!np) {
+ pr_err("%s: Timer description missing from Device Tree\n",
+ __func__);
+ return;
+ }
+ regbase = of_iomap(np, 0);
+ if (!regbase) {
+ pr_err("%s: Missing iobase description in Device Tree\n",
+ __func__);
+ of_node_put(np);
+ return;
+ }
+ timer_irq = irq_of_parse_and_map(np, 0);
+ if (!timer_irq) {
+ pr_err("%s: Missing irq description in Device Tree\n",
+ __func__);
+ of_node_put(np);
+ return;
+ }
writel(1, regbase + TIMER_CTRL_VAL);
writel(0xf, regbase + TIMER_STATUS_VAL);
writel(~0, regbase + TIMER_MATCH_VAL);
if (clocksource_register_hz(&clocksource, VT8500_TIMER_HZ))
- printk(KERN_ERR "vt8500_timer_init: clocksource_register failed for %s\n",
- clocksource.name);
+ pr_err("%s: vt8500_timer_init: clocksource_register failed for %s\n",
+ __func__, clocksource.name);
clockevents_calc_mult_shift(&clockevent, VT8500_TIMER_HZ, 4);
@@ -144,12 +176,9 @@ static void __init vt8500_timer_init(void)
clockevent.min_delta_ns = clockevent_delta2ns(4, &clockevent);
clockevent.cpumask = cpumask_of(0);
- if (setup_irq(wmt_timer_irq, &irq))
- printk(KERN_ERR "vt8500_timer_init: setup_irq failed for %s\n",
- clockevent.name);
+ if (setup_irq(timer_irq, &irq))
+ pr_err("%s: setup_irq failed for %s\n", __func__,
+ clockevent.name);
clockevents_register_device(&clockevent);
}
-struct sys_timer vt8500_timer = {
- .init = vt8500_timer_init
-};