From: Khiem Nguyen <khiem.nguyen.xt@renesas.com>
To: linux-sh@vger.kernel.org
Subject: [PATCH RFC v2 5/7] ARM: shmobile: Clear External Event Request in system resume
Date: Mon, 29 Sep 2014 05:05:55 +0000 [thread overview]
Message-ID: <5428E8B3.3090609@renesas.com> (raw)
According to datasheet, this step is necessary when waking up
from L2shutdown mode.
Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@renesas.com>
---
arch/arm/mach-shmobile/platsmp-apmu.c | 2 ++
arch/arm/mach-shmobile/pm-rcar.c | 22 ++++++++++++++++++++++
arch/arm/mach-shmobile/pm-rcar.h | 1 +
3 files changed, 25 insertions(+)
diff --git a/arch/arm/mach-shmobile/platsmp-apmu.c b/arch/arm/mach-shmobile/platsmp-apmu.c
index 5e4dcdb..ef146fa 100644
--- a/arch/arm/mach-shmobile/platsmp-apmu.c
+++ b/arch/arm/mach-shmobile/platsmp-apmu.c
@@ -26,6 +26,7 @@
#include <asm/smp_plat.h>
#include <asm/suspend.h>
#include "common.h"
+#include "pm-rcar.h"
static struct {
void __iomem *iomem;
@@ -244,6 +245,7 @@ static int shmobile_smp_apmu_enter_suspend(suspend_state_t state)
cpu_leave_lowpower();
writel_relaxed(0x0, cpucmcr);
+ rcar_sysc_clear_event_status();
return 0;
}
diff --git a/arch/arm/mach-shmobile/pm-rcar.c b/arch/arm/mach-shmobile/pm-rcar.c
index 00022ee..9f4ec85 100644
--- a/arch/arm/mach-shmobile/pm-rcar.c
+++ b/arch/arm/mach-shmobile/pm-rcar.c
@@ -12,6 +12,7 @@
#include <linux/err.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
+#include <asm/cputype.h>
#include <asm/io.h>
#include "pm-rcar.h"
@@ -24,6 +25,10 @@
#define PWROFFCR_OFFS 0x04
#define PWRONCR_OFFS 0x0c
#define PWRER_OFFS 0x14
+#define SYSCEERSR_OFFS 0x20
+#define SYSCEERSCR_OFFS 0x24
+#define SYSCEERSR2_OFFS 0x2C
+#define SYSCEERSCR2_OFFS 0x30
#define SYSCSR_RETRIES 100
#define SYSCSR_DELAY_US 1
@@ -34,6 +39,23 @@
static void __iomem *rcar_sysc_base;
static DEFINE_SPINLOCK(rcar_sysc_lock); /* SMP CPUs + I/O devices */
+void rcar_sysc_clear_event_status(void)
+{
+ if (read_cpuid_part() = ARM_CPU_PART_CORTEX_A15) {
+ /* Clear External event status regiser */
+ iowrite32(0x111, rcar_sysc_base + SYSCEERSCR_OFFS);
+
+ pr_debug("%s: External event status: 0x%08x\n", __func__,
+ ioread32(rcar_sysc_base + SYSCEERSR_OFFS));
+ } else {
+ /* Clear External event status regiser */
+ iowrite32(0x111, rcar_sysc_base + SYSCEERSCR2_OFFS);
+
+ pr_debug("%s: External event status: 0x%08x\n", __func__,
+ ioread32(rcar_sysc_base + SYSCEERSR2_OFFS));
+ }
+}
+
static int rcar_sysc_pwr_on_off(struct rcar_sysc_ch *sysc_ch,
int sr_bit, int reg_offs)
{
diff --git a/arch/arm/mach-shmobile/pm-rcar.h b/arch/arm/mach-shmobile/pm-rcar.h
index ef3a1ef..1a349bf 100644
--- a/arch/arm/mach-shmobile/pm-rcar.h
+++ b/arch/arm/mach-shmobile/pm-rcar.h
@@ -11,5 +11,6 @@ int rcar_sysc_power_down(struct rcar_sysc_ch *sysc_ch);
int rcar_sysc_power_up(struct rcar_sysc_ch *sysc_ch);
bool rcar_sysc_power_is_off(struct rcar_sysc_ch *sysc_ch);
void __iomem *rcar_sysc_init(phys_addr_t base);
+void rcar_sysc_clear_event_status(void);
#endif /* PM_RCAR_H */
--
1.7.9.5
reply other threads:[~2014-09-29 5:05 UTC|newest]
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