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ARM: tegra: enhance timer.c to get IRQ info from device tree

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Modify Tegra's timer code to parse the Tegra timer IRQ from device tree,
and to instantiate the TWD from device tree, rather than relying on hard-
coded values from <mach/irqs.h>.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Stephen Warren 2012-09-19 13:13:33 -06:00
parent 58664f9052
commit 56415480e9
1 changed files with 23 additions and 18 deletions
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41
arch/arm/mach-tegra/timer.c
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@ -26,13 +26,12 @@
#include <linux/clocksource.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of_irq.h>
#include <asm/mach/time.h>
#include <asm/smp_twd.h>
#include <asm/sched_clock.h>
#include <mach/irqs.h>
#include "board.h"
#include "clock.h"
#include "iomap.h"
@ -158,30 +157,32 @@ static struct irqaction tegra_timer_irq = {
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_TRIGGER_HIGH,
.handler = tegra_timer_interrupt,
.dev_id = &tegra_clockevent,
.irq = INT_TMR3,
};
#ifdef CONFIG_HAVE_ARM_TWD
static DEFINE_TWD_LOCAL_TIMER(twd_local_timer,
TEGRA_ARM_PERIF_BASE + 0x600,
IRQ_LOCALTIMER);
static void __init tegra_twd_init(void)
{
int err = twd_local_timer_register(&twd_local_timer);
if (err)
pr_err("twd_local_timer_register failed %d\n", err);
}
#else
#define tegra_twd_init() do {} while(0)
#endif
static const struct of_device_id timer_match[] __initconst = {
{ .compatible = "nvidia,tegra20-timer" },
{}
};
static void __init tegra_init_timer(void)
{
struct device_node *np;
struct clk *clk;
unsigned long rate;
int ret;
np = of_find_matching_node(NULL, timer_match);
if (!np) {
pr_err("Failed to find timer DT node\n");
BUG();
}
tegra_timer_irq.irq = irq_of_parse_and_map(np, 2);
if (tegra_timer_irq.irq <= 0) {
pr_err("Failed to map timer IRQ\n");
BUG();
}
clk = clk_get_sys("timer", NULL);
if (IS_ERR(clk)) {
pr_warn("Unable to get timer clock. Assuming 12Mhz input clock.\n");
@ -201,6 +202,8 @@ static void __init tegra_init_timer(void)
else
clk_prepare_enable(clk);
of_node_put(np);
switch (rate) {
case 12000000:
timer_writel(0x000b, TIMERUS_USEC_CFG);
@ -240,7 +243,9 @@ static void __init tegra_init_timer(void)
tegra_clockevent.cpumask = cpu_all_mask;
tegra_clockevent.irq = tegra_timer_irq.irq;
clockevents_register_device(&tegra_clockevent);
tegra_twd_init();
#ifdef CONFIG_HAVE_ARM_TWD
twd_local_timer_of_register();
#endif
register_persistent_clock(NULL, tegra_read_persistent_clock);
}