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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>
This commit is contained in:
Marc Zyngier 2012-01-10 19:39:26 +00:00
parent 0ef330e10d
commit 81e46f7b6d
2 changed files with 65 additions and 4 deletions
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18
arch/arm/include/asm/smp_twd.h
View File

@ -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

51
arch/arm/kernel/smp_twd.c
View File

@ -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;
}