diff mbox

[v2,2/2] pwm: pwm-tiecap: Low power sleep support

Message ID 1358414403-13431-3-git-send-email-avinashphilip@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

avinash philip Jan. 17, 2013, 9:20 a.m. UTC 
In low power modes of AM33XX platforms, peripherals power is cut off.
This patch supports low power sleep transition support for ECAP driver.

Signed-off-by: Philip Avinash <avinashphilip@ti.com>
---
Changes since v1:
	- check the enabled status of pwm device for handling module
	  enable/disable on resume/suspend

 drivers/pwm/pwm-tiecap.c |   53 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

Comments

Thierry Reding Jan. 17, 2013, 3:59 p.m. UTC | #1 
On Thu, Jan 17, 2013 at 02:50:03PM +0530, Philip Avinash wrote:
> In low power modes of AM33XX platforms, peripherals power is cut off.
> This patch supports low power sleep transition support for ECAP driver.
> 
> Signed-off-by: Philip Avinash <avinashphilip@ti.com>
> ---
> Changes since v1:
> 	- check the enabled status of pwm device for handling module
> 	  enable/disable on resume/suspend
> 
>  drivers/pwm/pwm-tiecap.c |   53 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)

Applied, thanks.

Thierry
avinash philip Jan. 18, 2013, 4:19 a.m. UTC | #2 
On Thu, Jan 17, 2013 at 21:29:14, Thierry Reding wrote:
> On Thu, Jan 17, 2013 at 02:50:03PM +0530, Philip Avinash wrote:
> > In low power modes of AM33XX platforms, peripherals power is cut off.
> > This patch supports low power sleep transition support for ECAP driver.
> > 
> > Signed-off-by: Philip Avinash <avinashphilip@ti.com>
> > ---
> > Changes since v1:
> > 	- check the enabled status of pwm device for handling module
> > 	  enable/disable on resume/suspend
> > 
> >  drivers/pwm/pwm-tiecap.c |   53 ++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 53 insertions(+)
> 
> Applied, thanks.

Thanks for applying this patch
Avinash

> 
> Thierry
> 

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diff mbox

Patch

diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 5cf016d..05b676d 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -41,10 +41,17 @@ 
 #define ECCTL2_SYNC_SEL_DISA	(BIT(7) | BIT(6))
 #define ECCTL2_TSCTR_FREERUN	BIT(4)
 
+struct ecap_context {
+	u32	cap3;
+	u32	cap4;
+	u16	ecctl2;
+};
+
 struct ecap_pwm_chip {
 	struct pwm_chip	chip;
 	unsigned int	clk_rate;
 	void __iomem	*mmio_base;
+	struct ecap_context ctx;
 };
 
 static inline struct ecap_pwm_chip *to_ecap_pwm_chip(struct pwm_chip *chip)
@@ -288,11 +295,57 @@  static int ecap_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&pc->chip);
 }
 
+void ecap_pwm_save_context(struct ecap_pwm_chip *pc)
+{
+	pm_runtime_get_sync(pc->chip.dev);
+	pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
+	pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
+	pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
+	pm_runtime_put_sync(pc->chip.dev);
+}
+
+void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
+{
+	writel(pc->ctx.cap3, pc->mmio_base + CAP3);
+	writel(pc->ctx.cap4, pc->mmio_base + CAP4);
+	writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);
+}
+
+static int ecap_pwm_suspend(struct device *dev)
+{
+	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
+	struct pwm_device *pwm = pc->chip.pwms;
+
+	ecap_pwm_save_context(pc);
+
+	/* Disable explicitly if PWM is running */
+	if (test_bit(PWMF_ENABLED, &pwm->flags))
+		pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int ecap_pwm_resume(struct device *dev)
+{
+	struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
+	struct pwm_device *pwm = pc->chip.pwms;
+
+	/* Enable explicitly if PWM was running */
+	if (test_bit(PWMF_ENABLED, &pwm->flags))
+		pm_runtime_get_sync(dev);
+
+	ecap_pwm_restore_context(pc);
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(ecap_pwm_pm_ops, ecap_pwm_suspend, ecap_pwm_resume);
+
 static struct platform_driver ecap_pwm_driver = {
 	.driver = {
 		.name	= "ecap",
 		.owner	= THIS_MODULE,
 		.of_match_table = ecap_of_match,
+		.pm	= &ecap_pwm_pm_ops,
 	},
 	.probe = ecap_pwm_probe,
 	.remove = ecap_pwm_remove,