* [PATCH v2 1/2] pwm: pwm-tiehrpwm: Low power sleep support
2013-01-17 9:20 [PATCH v2 0/2] LOW power sleep support for TI PWM submodules Philip Avinash
@ 2013-01-17 9:20 ` Philip Avinash
2013-01-17 15:59 ` Thierry Reding
2013-01-17 9:20 ` [PATCH v2 2/2] pwm: pwm-tiecap: " Philip Avinash
1 sibling, 1 reply; 7+ messages in thread
From: Philip Avinash @ 2013-01-17 9:20 UTC (permalink / raw)
To: thierry.reding
Cc: linux-kernel, linux-omap, nsekhar, gururaja.hebbar,
Philip Avinash
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@ti.com>
---
Changes since v1:
- check the enabled status of pwm device for handling module
enable/disable on resume/suspend
drivers/pwm/pwm-tiehrpwm.c | 83 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)
diff --git a/drivers/pwm/pwm-tiehrpwm.c b/drivers/pwm/pwm-tiehrpwm.c
index 4058df4..6627f42 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 +533,77 @@ static int ehrpwm_pwm_remove(struct platform_device *pdev)
return pwmchip_remove(&pc->chip);
}
+void ehrpwm_pwm_save_context(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_restore_context(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);
+ int i;
+
+ ehrpwm_pwm_save_context(pc);
+ for (i = 0; i < pc->chip.npwm; i++) {
+ struct pwm_device *pwm = &pc->chip.pwms[i];
+
+ if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ continue;
+
+ /* Disable explicitly if PWM is running */
+ pm_runtime_put_sync(dev);
+ }
+ return 0;
+}
+
+static int ehrpwm_pwm_resume(struct device *dev)
+{
+ struct ehrpwm_pwm_chip *pc = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < pc->chip.npwm; i++) {
+ struct pwm_device *pwm = &pc->chip.pwms[i];
+
+ if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ continue;
+
+ /* Enable explicitly if PWM was running */
+ pm_runtime_get_sync(dev);
+ }
+ ehrpwm_pwm_restore_context(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
^ permalink raw reply related [flat|nested] 7+ messages in thread* [PATCH v2 2/2] pwm: pwm-tiecap: Low power sleep support
2013-01-17 9:20 [PATCH v2 0/2] LOW power sleep support for TI PWM submodules Philip Avinash
2013-01-17 9:20 ` [PATCH v2 1/2] pwm: pwm-tiehrpwm: Low power sleep support Philip Avinash
@ 2013-01-17 9:20 ` Philip Avinash
2013-01-17 15:59 ` Thierry Reding
1 sibling, 1 reply; 7+ messages in thread
From: Philip Avinash @ 2013-01-17 9:20 UTC (permalink / raw)
To: thierry.reding
Cc: linux-kernel, linux-omap, nsekhar, gururaja.hebbar,
Philip Avinash
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(+)
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,
--
1.7.9.5
^ permalink raw reply related [flat|nested] 7+ messages in thread