From patchwork Tue Sep 16 09:22:15 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chen, Alvin" X-Patchwork-Id: 389912 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 4446C140111 for ; Tue, 16 Sep 2014 11:29:57 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757188AbaIPB3m (ORCPT ); Mon, 15 Sep 2014 21:29:42 -0400 Received: from mga01.intel.com ([192.55.52.88]:50501 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755863AbaIPB3i (ORCPT ); Mon, 15 Sep 2014 21:29:38 -0400 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by fmsmga101.fm.intel.com with ESMTP; 15 Sep 2014 18:29:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,532,1406617200"; d="scan'208";a="477747371" Received: from quark.bj.intel.com ([172.16.182.163]) by azsmga001.ch.intel.com with ESMTP; 15 Sep 2014 18:29:33 -0700 From: Weike Chen To: Linus Walleij , Alexandre Courbot , Grant Likely , Rob Herring , atull Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Boon Leong Ong , Hock Leong Kweh , Darren Hart , Sebastian Andrzej Siewior , Mika Westerberg , Andriy Shevchenko , Alvin Chen , Arnd Bergmann Subject: [PATCH 4/4 v4] GPIO: gpio-dwapb: Suspend & Resume PM enabling Date: Tue, 16 Sep 2014 02:22:15 -0700 Message-Id: <1410859335-11080-5-git-send-email-alvin.chen@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1410859335-11080-1-git-send-email-alvin.chen@intel.com> References: <1410859335-11080-1-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 Signed-off-by: Weike Chen --- drivers/gpio/gpio-dwapb.c | 109 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index 9a76e3c..14d83af 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -50,11 +50,14 @@ #define GPIO_SWPORT_DDR_SIZE (GPIO_SWPORTB_DDR - GPIO_SWPORTA_DDR) struct dwapb_gpio; +struct dwapb_context; struct dwapb_gpio_port { struct bgpio_chip bgc; bool is_registered; struct dwapb_gpio *gpio; + struct dwapb_context *ctx; + unsigned int idx; }; struct dwapb_gpio { @@ -377,6 +380,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, port = &gpio->ports[offs]; port->gpio = gpio; + port->idx = pp->idx; dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE); set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE); @@ -584,10 +588,115 @@ static const struct of_device_id dwapb_of_match[] = { }; MODULE_DEVICE_TABLE(of, dwapb_of_match); +#ifdef CONFIG_PM_SLEEP +/* Store GPIO context across system-wide suspend/resume transitions */ +struct dwapb_context { + u32 data; + u32 dir; + u32 ext; + u32 int_en; + u32 int_mask; + u32 int_type; + u32 int_pol; + u32 int_deb; +}; + +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; + int i; + + spin_lock_irqsave(&bgc->lock, flags); + for (i = 0; i < gpio->nr_ports; i++) { + unsigned int offset; + unsigned int idx = gpio->ports[i].idx; + struct dwapb_context *ctx = gpio->ports[i].ctx; + + if (!ctx) { + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + gpio->ports[i].ctx = ctx; + } + + offset = GPIO_SWPORTA_DDR + (idx * GPIO_SWPORT_DDR_SIZE); + ctx->dir = dwapb_read(gpio, offset); + + offset = GPIO_SWPORTA_DR + (idx * GPIO_SWPORT_DR_SIZE); + ctx->data = dwapb_read(gpio, offset); + + offset = GPIO_EXT_PORTA + (idx * GPIO_EXT_PORT_SIZE); + ctx->ext = dwapb_read(gpio, offset); + + /* Only port A can provide interrupts */ + if (idx == 0) { + ctx->int_mask = dwapb_read(gpio, GPIO_INTMASK); + ctx->int_en = dwapb_read(gpio, GPIO_INTEN); + ctx->int_pol = dwapb_read(gpio, GPIO_INT_POLARITY); + ctx->int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); + ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); + + /* 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; + int i; + + spin_lock_irqsave(&bgc->lock, flags); + for (i = 0; i < gpio->nr_ports; i++) { + unsigned int offset; + unsigned int idx = gpio->ports[i].idx; + struct dwapb_context *ctx = gpio->ports[i].ctx; + + BUG_ON(ctx == 0); + + offset = GPIO_SWPORTA_DR + (idx * GPIO_SWPORT_DR_SIZE); + dwapb_write(gpio, offset, ctx->data); + + offset = GPIO_SWPORTA_DDR + (idx * GPIO_SWPORT_DDR_SIZE); + dwapb_write(gpio, offset, ctx->dir); + + offset = GPIO_EXT_PORTA + (idx * GPIO_EXT_PORT_SIZE); + dwapb_write(gpio, offset, ctx->ext); + + /* Only port A can provide interrupts */ + if (idx == 0) { + dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type); + dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol); + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb); + dwapb_write(gpio, GPIO_INTEN, ctx->int_en); + dwapb_write(gpio, GPIO_INTMASK, ctx->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,