From patchwork Wed Sep 17 16:18:41 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chen, Alvin" X-Patchwork-Id: 390315 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 D34AC140096 for ; Wed, 17 Sep 2014 18:27:51 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754869AbaIQI0o (ORCPT ); Wed, 17 Sep 2014 04:26:44 -0400 Received: from mga11.intel.com ([192.55.52.93]:28461 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751939AbaIQI0j (ORCPT ); Wed, 17 Sep 2014 04:26:39 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 17 Sep 2014 01:26:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,539,1406617200"; d="scan'208";a="600839300" Received: from quark.bj.intel.com ([172.16.182.70]) by fmsmga002.fm.intel.com with ESMTP; 17 Sep 2014 01:26:35 -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 , Andy Shevchenko , Alvin Chen Subject: [PATCH 3/4 v5] GPIO: gpio-dwapb: Support Debounce Date: Wed, 17 Sep 2014 09:18:41 -0700 Message-Id: <1410970722-8579-4-git-send-email-alvin.chen@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1410970722-8579-1-git-send-email-alvin.chen@intel.com> References: <1410970722-8579-1-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 'debounce' for the designware GPIO, and it is based on Josef Ahmad's previous work. Reviewed-by: Hock Leong Kweh Reviewed-by: Andy Shevchenko Signed-off-by: Weike Chen --- drivers/gpio/gpio-dwapb.c | 36 ++++++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index 551eaf7..db059bb 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -37,6 +37,7 @@ #define GPIO_INTTYPE_LEVEL 0x38 #define GPIO_INT_POLARITY 0x3c #define GPIO_INTSTATUS 0x40 +#define GPIO_PORTA_DEBOUNCE 0x48 #define GPIO_PORTA_EOI 0x4c #define GPIO_EXT_PORTA 0x50 #define GPIO_EXT_PORTB 0x54 @@ -64,6 +65,12 @@ struct dwapb_gpio { struct irq_domain *domain; }; +static inline struct dwapb_gpio_port * +to_dwapb_gpio_port(struct bgpio_chip *bgc) +{ + return container_of(bgc, struct dwapb_gpio_port, bgc); +} + static inline u32 dwapb_read(struct dwapb_gpio *gpio, unsigned int offset) { struct bgpio_chip *bgc = &gpio->ports[0].bgc; @@ -84,8 +91,7 @@ static inline void dwapb_write(struct dwapb_gpio *gpio, unsigned int offset, static int dwapb_gpio_to_irq(struct gpio_chip *gc, unsigned offset) { struct bgpio_chip *bgc = to_bgpio_chip(gc); - struct dwapb_gpio_port *port = container_of(bgc, struct - dwapb_gpio_port, bgc); + struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc); struct dwapb_gpio *gpio = port->gpio; return irq_find_mapping(gpio->domain, offset); @@ -235,6 +241,28 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type) return 0; } +static int dwapb_gpio_set_debounce(struct gpio_chip *gc, + unsigned offset, unsigned debounce) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + struct dwapb_gpio_port *port = to_dwapb_gpio_port(bgc); + struct dwapb_gpio *gpio = port->gpio; + unsigned long flags, val_deb; + unsigned long mask = bgc->pin2mask(bgc, offset); + + spin_lock_irqsave(&bgc->lock, flags); + + val_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); + if (debounce) + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb | mask); + else + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, val_deb & ~mask); + + spin_unlock_irqrestore(&bgc->lock, flags); + + return 0; +} + static irqreturn_t dwapb_irq_handler_mfd(int irq, void *dev_id) { u32 worked; @@ -373,6 +401,10 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio, port->bgc.gc.ngpio = pp->ngpio; port->bgc.gc.base = pp->gpio_base; + /* Only port A support debounce */ + if (pp->idx == 0) + port->bgc.gc.set_debounce = dwapb_gpio_set_debounce; + if (pp->irq) dwapb_configure_irqs(gpio, port, pp);