From patchwork Wed Aug 27 17:46:28 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chen, Alvin" X-Patchwork-Id: 383406 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 8DCE01400AF for ; Wed, 27 Aug 2014 19:56:14 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933415AbaH0Jye (ORCPT ); Wed, 27 Aug 2014 05:54:34 -0400 Received: from mga03.intel.com ([143.182.124.21]:3195 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933409AbaH0Jyd (ORCPT ); Wed, 27 Aug 2014 05:54:33 -0400 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga101.ch.intel.com with ESMTP; 27 Aug 2014 02:54:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,409,1406617200"; d="scan'208";a="473110658" Received: from quark.bj.intel.com ([172.16.182.163]) by azsmga001.ch.intel.com with ESMTP; 27 Aug 2014 02:54:28 -0700 From: Weike Chen To: Linus Walleij , Alexandre Courbot , Grant Likely , Rob Herring Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Boon Leong Ong , Andriy Shevchenko , Mika Westerberg , Hock Leong Kweh , Darren Hart , Alvin Chen Subject: [PATCH 3/3] GPIO: gpio-dwapb: Suspend & Resume PM enabling Date: Wed, 27 Aug 2014 10:46:28 -0700 Message-Id: <1409161588-19417-4-git-send-email-alvin.chen@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1409161588-19417-1-git-send-email-alvin.chen@intel.com> References: <1409161588-19417-1-git-send-email-alvin.chen@intel.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch enables suspend and resume mode for the power management, and it is based on Josef Ahmad's previous work. Reviewed-by: Hock Leong Kweh Reviewed-by: Shevchenko, Andriy Signed-off-by: Weike Chen --- drivers/gpio/gpio-dwapb.c | 67 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index e0ab988..1055cb3 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -560,10 +560,77 @@ static const struct of_device_id dwapb_of_match[] = { }; MODULE_DEVICE_TABLE(of, dwapb_of_match); +#if defined CONFIG_PM_SLEEP +/* Store GPIO context across system-wide suspend/resume transitions */ +static struct gpio_saved_regs { + unsigned long data; + unsigned long dir; + unsigned long int_en; + unsigned long int_mask; + unsigned long int_type; + unsigned long int_pol; + unsigned long int_deb; +} saved_regs; + +static int dwapb_gpio_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct dwapb_gpio *gpio = platform_get_drvdata(pdev); + struct bgpio_chip *bgc = &gpio->ports[0].bgc; + unsigned long flags; + + spin_lock_irqsave(&bgc->lock, flags); + + saved_regs.int_mask = dwapb_read(gpio, GPIO_INTMASK); + saved_regs.int_en = dwapb_read(gpio, GPIO_INTEN); + saved_regs.int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); + saved_regs.int_pol = dwapb_read(gpio, GPIO_INT_POLARITY); + saved_regs.int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); + saved_regs.dir = dwapb_read(gpio, GPIO_SWPORTA_DDR); + saved_regs.data = dwapb_read(gpio, GPIO_SWPORTA_DR); + + /* Mask out interrupts */ + dwapb_write(gpio, GPIO_INTMASK, 0xffffffff); + + spin_unlock_irqrestore(&bgc->lock, flags); + + return 0; +} + +static int dwapb_gpio_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct dwapb_gpio *gpio = platform_get_drvdata(pdev); + struct bgpio_chip *bgc = &gpio->ports[0].bgc; + unsigned long flags; + + spin_lock_irqsave(&bgc->lock, flags); + + dwapb_write(gpio, GPIO_SWPORTA_DR, saved_regs.data); + dwapb_write(gpio, GPIO_SWPORTA_DDR, saved_regs.dir); + dwapb_write(gpio, GPIO_INTTYPE_LEVEL, saved_regs.int_type); + dwapb_write(gpio, GPIO_INT_POLARITY, saved_regs.int_pol); + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, saved_regs.int_deb); + dwapb_write(gpio, GPIO_INTEN, saved_regs.int_en); + dwapb_write(gpio, GPIO_INTMASK, saved_regs.int_mask); + + /* Clear out spurious interrupts */ + dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff); + + spin_unlock_irqrestore(&bgc->lock, flags); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend, + dwapb_gpio_resume); + static struct platform_driver dwapb_gpio_driver = { .driver = { .name = "gpio-dwapb", .owner = THIS_MODULE, + .pm = &dwapb_gpio_pm_ops, .of_match_table = of_match_ptr(dwapb_of_match), }, .probe = dwapb_gpio_probe,