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Diffstat (limited to 'arch/arm/kernel/smp_twd.c')
-rw-r--r--arch/arm/kernel/smp_twd.c123
1 files changed, 100 insertions, 23 deletions
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index 7a79b24..fef42b2 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -18,20 +18,23 @@
#include <linux/smp.h>
#include <linux/jiffies.h>
#include <linux/clockchips.h>
-#include <linux/irq.h>
+#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
#include <asm/smp_twd.h>
#include <asm/localtimer.h>
#include <asm/hardware/gic.h>
/* set up by the platform code */
-void __iomem *twd_base;
+static void __iomem *twd_base;
static struct clk *twd_clk;
static unsigned long twd_timer_rate;
static struct clock_event_device __percpu **twd_evt;
+static int twd_ppi;
static void twd_set_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
@@ -77,7 +80,7 @@ static int twd_set_next_event(unsigned long evt,
* If a local timer interrupt has occurred, acknowledge and return 1.
* Otherwise, return 0.
*/
-int twd_timer_ack(void)
+static int twd_timer_ack(void)
{
if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) {
__raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
@@ -87,7 +90,7 @@ int twd_timer_ack(void)
return 0;
}
-void twd_timer_stop(struct clock_event_device *clk)
+static void twd_timer_stop(struct clock_event_device *clk)
{
twd_set_mode(CLOCK_EVT_MODE_UNUSED, clk);
disable_percpu_irq(clk->irq);
@@ -222,28 +225,10 @@ static struct clk *twd_get_clock(void)
/*
* Setup the local clock events for a CPU.
*/
-void __cpuinit twd_timer_setup(struct clock_event_device *clk)
+static int __cpuinit twd_timer_setup(struct clock_event_device *clk)
{
struct clock_event_device **this_cpu_clk;
- if (!twd_evt) {
- int err;
-
- twd_evt = alloc_percpu(struct clock_event_device *);
- if (!twd_evt) {
- pr_err("twd: can't allocate memory\n");
- return;
- }
-
- err = request_percpu_irq(clk->irq, twd_handler,
- "twd", twd_evt);
- if (err) {
- pr_err("twd: can't register interrupt %d (%d)\n",
- clk->irq, err);
- return;
- }
- }
-
if (!twd_clk)
twd_clk = twd_get_clock();
@@ -260,6 +245,7 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
clk->rating = 350;
clk->set_mode = twd_set_mode;
clk->set_next_event = twd_set_next_event;
+ clk->irq = twd_ppi;
this_cpu_clk = __this_cpu_ptr(twd_evt);
*this_cpu_clk = clk;
@@ -267,4 +253,95 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
clockevents_config_and_register(clk, twd_timer_rate,
0xf, 0xffffffff);
enable_percpu_irq(clk->irq, 0);
+
+ return 0;
+}
+
+static struct local_timer_ops twd_lt_ops __cpuinitdata = {
+ .setup = twd_timer_setup,
+ .stop = twd_timer_stop,
+};
+
+static int __init twd_local_timer_common_register(void)
+{
+ int err;
+
+ twd_evt = alloc_percpu(struct clock_event_device *);
+ if (!twd_evt) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ err = request_percpu_irq(twd_ppi, twd_handler, "twd", twd_evt);
+ if (err) {
+ pr_err("twd: can't register interrupt %d (%d)\n", twd_ppi, err);
+ goto out_free;
+ }
+
+ err = local_timer_register(&twd_lt_ops);
+ if (err)
+ goto out_irq;
+
+ return 0;
+
+out_irq:
+ free_percpu_irq(twd_ppi, twd_evt);
+out_free:
+ iounmap(twd_base);
+ twd_base = NULL;
+ free_percpu(twd_evt);
+
+ return err;
}
+
+int __init twd_local_timer_register(struct twd_local_timer *tlt)
+{
+ if (twd_base || twd_evt)
+ return -EBUSY;
+
+ twd_ppi = tlt->res[1].start;
+
+ twd_base = ioremap(tlt->res[0].start, resource_size(&tlt->res[0]));
+ if (!twd_base)
+ return -ENOMEM;
+
+ return twd_local_timer_common_register();
+}
+
+#ifdef CONFIG_OF
+const static struct of_device_id twd_of_match[] __initconst = {
+ { .compatible = "arm,cortex-a9-twd-timer", },
+ { .compatible = "arm,cortex-a5-twd-timer", },
+ { .compatible = "arm,arm11mp-twd-timer", },
+ { },
+};
+
+void __init twd_local_timer_of_register(void)
+{
+ struct device_node *np;
+ int err;
+
+ np = of_find_matching_node(NULL, twd_of_match);
+ if (!np) {
+ err = -ENODEV;
+ goto out;
+ }
+
+ twd_ppi = irq_of_parse_and_map(np, 0);
+ if (!twd_ppi) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ twd_base = of_iomap(np, 0);
+ if (!twd_base) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = twd_local_timer_common_register();
+
+out:
+ WARN(err, "twd_local_timer_of_register failed (%d)\n", err);
+}
+#endif