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Date: Thu, 10 Jan 2013 18:33:43 +0530
From: Philip Avinash <avinashphilip@...com>
To: <thierry.reding@...onic-design.de>
CC: <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
<nsekhar@...com>, <gururaja.hebbar@...com>,
Philip Avinash <avinashphilip@...com>
Subject: [PATCH 1/2] pwm: pwm-tiehrpwm: Low power sleep support
In low power modes of AM33XX platforms, peripherals power is cut off.
This patch supports low power sleep transition support for EHRPWM
driver.
Signed-off-by: Philip Avinash <avinashphilip@...com>
---
drivers/pwm/pwm-tiehrpwm.c | 65 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 4fcafbf..831f394 100644
--- a/drivers/pwm/pwm-tiehrpwm.c
+++ b/drivers/pwm/pwm-tiehrpwm.c
@@ -113,6 +113,17 @@
#define NUM_PWM_CHANNEL 2 /* EHRPWM channels */
+struct ehrpwm_context {
+ u16 tbctl;
+ u16 tbprd;
+ u16 cmpa;
+ u16 cmpb;
+ u16 aqctla;
+ u16 aqctlb;
+ u16 aqsfrc;
+ u16 aqcsfrc;
+};
+
struct ehrpwm_pwm_chip {
struct pwm_chip chip;
unsigned int clk_rate;
@@ -120,6 +131,7 @@ struct ehrpwm_pwm_chip {
unsigned long period_cycles[NUM_PWM_CHANNEL];
enum pwm_polarity polarity[NUM_PWM_CHANNEL];
struct clk *tbclk;
+ struct ehrpwm_context ctx;
};
static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
@@ -127,6 +139,11 @@ static inline struct ehrpwm_pwm_chip *to_ehrpwm_pwm_chip(struct pwm_chip *chip)
return container_of(chip, struct ehrpwm_pwm_chip, chip);
}
+static u16 ehrpwm_read(void *base, int offset)
+{
+ return readw(base + offset);
+}
+
static void ehrpwm_write(void *base, int offset, unsigned int val)
{
writew(val & 0xFFFF, base + offset);
@@ -516,11 +533,59 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
return pwmchip_remove(&pc->chip);
}
+void ehrpwm_pwm_context_save(struct ehrpwm_pwm_chip *pc)
+{
+ pm_runtime_get_sync(pc->chip.dev);
+ pc->ctx.tbctl = ehrpwm_read(pc->mmio_base, TBCTL);
+ pc->ctx.tbprd = ehrpwm_read(pc->mmio_base, TBPRD);
+ pc->ctx.cmpa = ehrpwm_read(pc->mmio_base, CMPA);
+ pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
+ pc->ctx.aqctla = ehrpwm_read(pc->mmio_base, AQCTLA);
+ pc->ctx.aqctlb = ehrpwm_read(pc->mmio_base, AQCTLB);
+ pc->ctx.aqsfrc = ehrpwm_read(pc->mmio_base, AQSFRC);
+ pc->ctx.aqcsfrc = ehrpwm_read(pc->mmio_base, AQCSFRC);
+ pm_runtime_put_sync(pc->chip.dev);
+}
+
+void ehrpwm_pwm_context_restore(struct ehrpwm_pwm_chip *pc)
+{
+ ehrpwm_write(pc->mmio_base, TBPRD, pc->ctx.tbprd);
+ ehrpwm_write(pc->mmio_base, CMPA, pc->ctx.cmpa);
+ ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);
+ ehrpwm_write(pc->mmio_base, AQCTLA, pc->ctx.aqctla);
+ ehrpwm_write(pc->mmio_base, AQCTLB, pc->ctx.aqctlb);
+ ehrpwm_write(pc->mmio_base, AQSFRC, pc->ctx.aqsfrc);
+ ehrpwm_write(pc->mmio_base, AQCSFRC, pc->ctx.aqcsfrc);
+ ehrpwm_write(pc->mmio_base, TBCTL, pc->ctx.tbctl);
+}
+
+static int ehrpwm_pwm_suspend(struct device *dev)
+{
+ struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
+
+ ehrpwm_pwm_context_save(pc);
+ pm_runtime_put_sync(dev);
+ return 0;
+}
+
+static int ehrpwm_pwm_resume(struct device *dev)
+{
+ struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
+
+ pm_runtime_get_sync(dev);
+ ehrpwm_pwm_context_restore(pc);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ehrpwm_pwm_pm_ops, ehrpwm_pwm_suspend,
+ ehrpwm_pwm_resume);
+
static struct platform_driver ehrpwm_pwm_driver = {
.driver = {
.name = "ehrpwm",
.owner = THIS_MODULE,
.of_match_table = ehrpwm_of_match,
+ .pm = &ehrpwm_pwm_pm_ops,
},
.probe = ehrpwm_pwm_probe,
.remove = ehrpwm_pwm_remove,
--
1.7.9.5
--
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