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pwm: pwm-tiecap: 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 ECAP driver. Signed-off-by: Philip Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
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@ -41,10 +41,17 @@
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#define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6))
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#define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6))
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#define ECCTL2_TSCTR_FREERUN BIT(4)
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#define ECCTL2_TSCTR_FREERUN BIT(4)
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struct ecap_context {
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u32 cap3;
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u32 cap4;
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u16 ecctl2;
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};
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struct ecap_pwm_chip {
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struct ecap_pwm_chip {
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struct pwm_chip chip;
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struct pwm_chip chip;
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unsigned int clk_rate;
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unsigned int clk_rate;
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void __iomem *mmio_base;
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void __iomem *mmio_base;
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struct ecap_context ctx;
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};
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};
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static inline struct ecap_pwm_chip *to_ecap_pwm_chip(struct pwm_chip *chip)
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static inline struct ecap_pwm_chip *to_ecap_pwm_chip(struct pwm_chip *chip)
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@ -288,11 +295,57 @@ static int ecap_pwm_remove(struct platform_device *pdev)
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return pwmchip_remove(&pc->chip);
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return pwmchip_remove(&pc->chip);
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}
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}
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void ecap_pwm_save_context(struct ecap_pwm_chip *pc)
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{
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pm_runtime_get_sync(pc->chip.dev);
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pc->ctx.ecctl2 = readw(pc->mmio_base + ECCTL2);
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pc->ctx.cap4 = readl(pc->mmio_base + CAP4);
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pc->ctx.cap3 = readl(pc->mmio_base + CAP3);
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pm_runtime_put_sync(pc->chip.dev);
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}
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void ecap_pwm_restore_context(struct ecap_pwm_chip *pc)
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{
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writel(pc->ctx.cap3, pc->mmio_base + CAP3);
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writel(pc->ctx.cap4, pc->mmio_base + CAP4);
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writew(pc->ctx.ecctl2, pc->mmio_base + ECCTL2);
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}
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static int ecap_pwm_suspend(struct device *dev)
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{
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struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
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struct pwm_device *pwm = pc->chip.pwms;
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ecap_pwm_save_context(pc);
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/* Disable explicitly if PWM is running */
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if (test_bit(PWMF_ENABLED, &pwm->flags))
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pm_runtime_put_sync(dev);
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return 0;
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}
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static int ecap_pwm_resume(struct device *dev)
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{
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struct ecap_pwm_chip *pc = dev_get_drvdata(dev);
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struct pwm_device *pwm = pc->chip.pwms;
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/* Enable explicitly if PWM was running */
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if (test_bit(PWMF_ENABLED, &pwm->flags))
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pm_runtime_get_sync(dev);
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ecap_pwm_restore_context(pc);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(ecap_pwm_pm_ops, ecap_pwm_suspend, ecap_pwm_resume);
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static struct platform_driver ecap_pwm_driver = {
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static struct platform_driver ecap_pwm_driver = {
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.driver = {
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.driver = {
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.name = "ecap",
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.name = "ecap",
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.owner = THIS_MODULE,
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.owner = THIS_MODULE,
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.of_match_table = ecap_of_match,
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.of_match_table = ecap_of_match,
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.pm = &ecap_pwm_pm_ops,
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},
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},
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.probe = ecap_pwm_probe,
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.probe = ecap_pwm_probe,
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.remove = ecap_pwm_remove,
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.remove = ecap_pwm_remove,
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