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authorMarc Zyngier <marc.zyngier@arm.com>2012-01-10 19:39:26 (GMT)
committerMarc Zyngier <marc.zyngier@arm.com>2012-03-13 13:27:50 (GMT)
commit81e46f7b6dcec485bcb1f988ba4dc5b20189573c (patch)
tree13e8da9addc2c1428ae3ac308e5a9223efc29a8a /arch/arm
parent0ef330e10dcdbca8f4566e9eaf77015f8ce039d3 (diff)
downloadlinux-81e46f7b6dcec485bcb1f988ba4dc5b20189573c.tar.xz
ARM: smp_twd: add runtime registration support
Add support for the new registration interface to smp_twd. Platforms can populate a struct twd_local_timer with MMIO and IRQ resources, and then call twd_local_timer_register() to have the timer registered with the core. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/smp_twd.h18
-rw-r--r--arch/arm/kernel/smp_twd.c51
2 files changed, 65 insertions, 4 deletions
diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h
index bf8449d..16c89b7 100644
--- a/arch/arm/include/asm/smp_twd.h
+++ b/arch/arm/include/asm/smp_twd.h
@@ -18,10 +18,26 @@
#define TWD_TIMER_CONTROL_PERIODIC (1 << 1)
#define TWD_TIMER_CONTROL_IT_ENABLE (1 << 2)
+#include <linux/ioport.h>
+
struct clock_event_device;
extern void __iomem *twd_base;
-void twd_timer_setup(struct clock_event_device *);
+int twd_timer_setup(struct clock_event_device *);
+
+struct twd_local_timer {
+ struct resource res[2];
+};
+
+#define DEFINE_TWD_LOCAL_TIMER(name,base,irq) \
+struct twd_local_timer name __initdata = { \
+ .res = { \
+ DEFINE_RES_MEM(base, 0x10), \
+ DEFINE_RES_IRQ(irq), \
+ }, \
+};
+
+int twd_local_timer_register(struct twd_local_timer *);
#endif
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index b39916a..18c55f1 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -32,6 +32,7 @@ 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)
@@ -227,7 +228,7 @@ 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)
+int __cpuinit twd_timer_setup(struct clock_event_device *clk)
{
struct clock_event_device **this_cpu_clk;
@@ -237,7 +238,7 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
twd_evt = alloc_percpu(struct clock_event_device *);
if (!twd_evt) {
pr_err("twd: can't allocate memory\n");
- return;
+ return -ENOMEM;
}
err = request_percpu_irq(clk->irq, twd_handler,
@@ -245,7 +246,7 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
if (err) {
pr_err("twd: can't register interrupt %d (%d)\n",
clk->irq, err);
- return;
+ return err;
}
}
@@ -265,6 +266,8 @@ 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;
+ if (!clk->irq)
+ clk->irq = twd_ppi;
this_cpu_clk = __this_cpu_ptr(twd_evt);
*this_cpu_clk = clk;
@@ -272,4 +275,46 @@ 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,
+};
+
+int __init twd_local_timer_register(struct twd_local_timer *tlt)
+{
+ int err;
+
+ if (twd_base || twd_evt)
+ return -EBUSY;
+
+ twd_ppi = tlt->res[1].start;
+
+ twd_evt = alloc_percpu(struct clock_event_device *);
+ twd_base = ioremap(tlt->res[0].start, resource_size(&tlt->res[0]));
+ if (!twd_base || !twd_evt) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ 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;
+ }
+
+ err = local_timer_register(&twd_lt_ops);
+ if (err)
+ goto out;
+
+ return 0;
+
+out:
+ iounmap(twd_base);
+ free_percpu(twd_evt);
+ twd_base = twd_evt = NULL;
+ return err;
}