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Message-ID: <20111025131203.1f21ebcf@taxman.wild-wind.fr.eu.org>
Date: Tue, 25 Oct 2011 13:12:03 +0100
From: Marc Zyngier <maz@...terjones.org>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Arnd Bergmann <arnd@...db.de>, linux-next@...r.kernel.org,
linux-kernel@...r.kernel.org, Russell King <rmk@....linux.org.uk>,
Changhwan Youn <chaos.youn@...sung.com>,
Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: linux-next: manual merge of the arm-soc tree with the arm tree
On Tue, 25 Oct 2011 07:45:32 +1100
Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> Hi Arnd,
>
> Today's linux-next merge of the arm-soc tree got a conflict in
> arch/arm/mach-exynos4/include/mach/entry-macro.S between commit
> 292b293ceef2 ("ARM: gic: consolidate PPI handling") from the arm tree and
> commit 3a0622811292 ("ARM: EXYNOS4: Add support MCT PPI for EXYNOS4212")
> from the arm-soc tree.
>
> Again, I hacked it up (again probably incorrectly - I kept both
> additions).
Here's the patch I've applied to my local copy of next-20111025.
Compile-tested only.
>From bb5510b2bf42bece7f8b27fff05e8841c5832cd5 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@....com>
Date: Tue, 25 Oct 2011 12:42:01 +0100
Subject: [PATCH] ARM: EXYNOS4: convert MCT to percpu interrupt API
MCT recently gained per cpu interrupts, and missed the fact that
ARM has moved to a genirq based implementation.
This patch converts the driver to the new API.
Cc: Kukjin Kim <kgene.kim@...sung.com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
arch/arm/mach-exynos4/mct.c | 40 +++++++++++++++++++++++++++-------------
1 files changed, 27 insertions(+), 13 deletions(-)
diff --git a/arch/arm/mach-exynos4/mct.c b/arch/arm/mach-exynos4/mct.c
index f191608..4764c5d 100644
--- a/arch/arm/mach-exynos4/mct.c
+++ b/arch/arm/mach-exynos4/mct.c
@@ -44,7 +44,7 @@ struct mct_clock_event_device {
char name[10];
};
-struct mct_clock_event_device mct_tick[NR_CPUS];
+static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick);
static void exynos4_mct_write(unsigned int value, void *addr)
{
@@ -302,7 +302,7 @@ static void exynos4_mct_tick_start(unsigned long cycles,
static int exynos4_tick_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
- struct mct_clock_event_device *mevt = &mct_tick[smp_processor_id()];
+ struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
exynos4_mct_tick_start(cycles, mevt);
@@ -312,7 +312,7 @@ static int exynos4_tick_set_next_event(unsigned long cycles,
static inline void exynos4_tick_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
- struct mct_clock_event_device *mevt = &mct_tick[smp_processor_id()];
+ struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
exynos4_mct_tick_stop(mevt);
@@ -376,14 +376,16 @@ static struct irqaction mct_tick1_event_irq = {
static void exynos4_mct_tick_init(struct clock_event_device *evt)
{
+ struct mct_clock_event_device *mevt;
unsigned int cpu = smp_processor_id();
- mct_tick[cpu].evt = evt;
+ mevt = this_cpu_ptr(&percpu_mct_tick);
+ mevt->evt = evt;
- mct_tick[cpu].base = EXYNOS4_MCT_L_BASE(cpu);
- sprintf(mct_tick[cpu].name, "mct_tick%d", cpu);
+ mevt->base = EXYNOS4_MCT_L_BASE(cpu);
+ sprintf(mevt->name, "mct_tick%d", cpu);
- evt->name = mct_tick[cpu].name;
+ evt->name = mevt->name;
evt->cpumask = cpumask_of(cpu);
evt->set_next_event = exynos4_tick_set_next_event;
evt->set_mode = exynos4_tick_set_mode;
@@ -398,21 +400,21 @@ static void exynos4_mct_tick_init(struct clock_event_device *evt)
clockevents_register_device(evt);
- exynos4_mct_write(0x1, mct_tick[cpu].base + MCT_L_TCNTB_OFFSET);
+ exynos4_mct_write(0x1, mevt->base + MCT_L_TCNTB_OFFSET);
if (mct_int_type == MCT_INT_SPI) {
if (cpu == 0) {
- mct_tick0_event_irq.dev_id = &mct_tick[cpu];
+ mct_tick0_event_irq.dev_id = mevt;
evt->irq = IRQ_MCT_L0;
setup_irq(IRQ_MCT_L0, &mct_tick0_event_irq);
} else {
- mct_tick1_event_irq.dev_id = &mct_tick[cpu];
+ mct_tick1_event_irq.dev_id = mevt;
evt->irq = IRQ_MCT_L1;
setup_irq(IRQ_MCT_L1, &mct_tick1_event_irq);
irq_set_affinity(IRQ_MCT_L1, cpumask_of(1));
}
} else {
- gic_enable_ppi(IRQ_MCT_LOCALTIMER);
+ enable_percpu_irq(IRQ_MCT_LOCALTIMER, 0);
}
}
@@ -427,9 +429,11 @@ int __cpuinit local_timer_setup(struct clock_event_device *evt)
void local_timer_stop(struct clock_event_device *evt)
{
evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
- disable_irq(evt->irq);
+ if (mct_int_type == MCT_INT_SPI)
+ disable_irq(evt->irq);
+ else
+ disable_percpu_irq(IRQ_MCT_LOCALTIMER);
}
-
#endif /* CONFIG_LOCAL_TIMERS */
static void __init exynos4_timer_resources(void)
@@ -438,6 +442,16 @@ static void __init exynos4_timer_resources(void)
mct_clk = clk_get(NULL, "xtal");
clk_rate = clk_get_rate(mct_clk);
+
+ if (mct_int_type == MCT_INT_PPI) {
+ int err;
+
+ err = request_percpu_irq(IRQ_MCT_LOCALTIMER,
+ exynos4_mct_tick_isr, "MCT",
+ &percpu_mct_tick);
+ WARN(err, "MCT: can't request IRQ %d (%d)\n",
+ IRQ_MCT_LOCALTIMER, err);
+ }
}
static void __init exynos4_timer_init(void)
--
1.7.7
--
I'm the slime oozin' out from your TV set...
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