From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759356Ab3AQJTt (ORCPT ); Thu, 17 Jan 2013 04:19:49 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:36612 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755787Ab3AQJTq (ORCPT ); Thu, 17 Jan 2013 04:19:46 -0500 From: Philip Avinash To: CC: , , , , Philip Avinash Subject: [PATCH v2 2/2] pwm: pwm-tiecap: Low power sleep support Date: Thu, 17 Jan 2013 14:50:03 +0530 Message-ID: <1358414403-13431-3-git-send-email-avinashphilip@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1358414403-13431-1-git-send-email-avinashphilip@ti.com> References: <1358414403-13431-1-git-send-email-avinashphilip@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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