From patchwork Wed Jul 2 15:41:02 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Figa X-Patchwork-Id: 4466471 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 2F14FBEEAA for ; Wed, 2 Jul 2014 15:44:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 917E2203E1 for ; Wed, 2 Jul 2014 15:44:19 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D16092038E for ; Wed, 2 Jul 2014 15:44:17 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1X2Mfz-0006yW-T2; Wed, 02 Jul 2014 15:42:27 +0000 Received: from mailout2.w1.samsung.com ([210.118.77.12]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1X2Mfc-0006kl-4p for linux-arm-kernel@lists.infradead.org; Wed, 02 Jul 2014 15:42:05 +0000 Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout2.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0N8300989CWY2Z50@mailout2.w1.samsung.com> for linux-arm-kernel@lists.infradead.org; Wed, 02 Jul 2014 16:41:22 +0100 (BST) X-AuditID: cbfec7f4-b7fac6d000006cfe-da-53b42831eb03 Received: from eusync1.samsung.com ( [203.254.199.211]) by eucpsbgm1.samsung.com (EUCPMTA) with SMTP id 3B.46.27902.13824B35; Wed, 02 Jul 2014 16:41:37 +0100 (BST) Received: from AMDC1227.digital.local ([106.116.147.199]) by eusync1.samsung.com (Oracle Communications Messaging Server 7u4-23.01(7.0.4.23.0) 64bit (built Aug 10 2011)) with ESMTPA id <0N8300DO3CX9L0B0@eusync1.samsung.com>; Wed, 02 Jul 2014 16:41:37 +0100 (BST) From: Tomasz Figa To: linux-samsung-soc@vger.kernel.org Subject: [PATCH 4/6] pinctrl: exynos: Lock GPIOs as interrupts when used as EINTs Date: Wed, 02 Jul 2014 17:41:02 +0200 Message-id: <1404315664-3174-5-git-send-email-t.figa@samsung.com> X-Mailer: git-send-email 1.9.3 In-reply-to: <1404315664-3174-1-git-send-email-t.figa@samsung.com> References: <1404315664-3174-1-git-send-email-t.figa@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrPJMWRmVeSWpSXmKPExsVy+t/xy7qGGluCDTbNk7E4u+wgm0Xvgqts FlP+LGey2PT4GqvFjPP7mCzWz3jN4sDmMbvhIovHnWt72Dw2L6n36NuyitHj8ya5ANYoLpuU 1JzMstQifbsErowFbzcyFvzUrGjr2sjYwLheuYuRk0NCwERi9dwZjBC2mMSFe+vZuhi5OIQE ljJKHNzTxAjh9DFJnLp0kg2kik1ATeJzwyMwW0RAVeJz2wJ2kCJmgcOMEocWHmDpYuTgEBYI llh92g2khgWoZuPTfrB6XgFHiXM/m9ggtslJ9G57wwxSzingJPHshTdIWAio5OG7RUwTGHkX MDKsYhRNLU0uKE5KzzXUK07MLS7NS9dLzs/dxAgJpC87GBcfszrEKMDBqMTD27hiQ7AQa2JZ cWXuIUYJDmYlEd4TAluChXhTEiurUovy44tKc1KLDzEycXBKNTA6i4ZeE3jqseYt/xapa5/c Nih4K4t+frdGrePp9rt2Z4ob79qVywen+kwvupFzdfZ7Rq5TM8TfRUvdP/HM7fIilfUHPsn9 PTvx9MIdSU8u7dQ0z7mitMz+fecrxzM2P+f7vW9bk5X66YUd/64nF2P3bpBY1cbh2C/99cKc W2q7H99aeKkizcv3lBJLcUaioRZzUXEiADz38SYCAgAA X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140702_084204_337617_4C3747BD X-CRM114-Status: GOOD ( 13.47 ) X-Spam-Score: -5.0 (-----) Cc: Tomasz Figa , Linus Walleij , Kukjin Kim , Doug Anderson , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently after configuring a GPIO pin as an interrupt related pinmux registers are changed, but there is no protection from calling gpio_direction_*() in a badly written driver, which would cause the same pinmux register to be reconfigured for regular input/output and this disabling interrupt capability of the pin. This patch addresses this issue by moving pinmux reconfiguration to .irq_startup() callback of irq_chip and calling gpio_lock_as_irq() helper to prevent reconfiguration of pin direction. Signed-off-by: Tomasz Figa --- drivers/pinctrl/pinctrl-exynos.c | 69 +++++++++++++++++++++++++++++++++++---- drivers/pinctrl/pinctrl-samsung.h | 1 + 2 files changed, 64 insertions(+), 6 deletions(-) diff --git a/drivers/pinctrl/pinctrl-exynos.c b/drivers/pinctrl/pinctrl-exynos.c index 003bfd8..a209cb4 100644 --- a/drivers/pinctrl/pinctrl-exynos.c +++ b/drivers/pinctrl/pinctrl-exynos.c @@ -127,14 +127,10 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type) struct irq_chip *chip = irq_data_get_irq_chip(irqd); struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip); struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd); - struct samsung_pin_bank_type *bank_type = bank->type; struct samsung_pinctrl_drv_data *d = bank->drvdata; - unsigned int pin = irqd->hwirq; - unsigned int shift = EXYNOS_EINT_CON_LEN * pin; + unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq; unsigned int con, trig_type; unsigned long reg_con = our_chip->eint_con + bank->eint_offset; - unsigned long flags; - unsigned int mask; switch (type) { case IRQ_TYPE_EDGE_RISING: @@ -167,8 +163,32 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type) con |= trig_type << shift; writel(con, d->virt_base + reg_con); + return 0; +} + +static unsigned int exynos_irq_startup(struct irq_data *irqd) +{ + struct irq_chip *chip = irq_data_get_irq_chip(irqd); + struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip); + struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd); + struct samsung_pin_bank_type *bank_type = bank->type; + struct samsung_pinctrl_drv_data *d = bank->drvdata; + unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq; + unsigned long reg_con = our_chip->eint_con + bank->eint_offset; + unsigned long flags; + unsigned int mask; + unsigned int con; + int ret; + + ret = gpio_lock_as_irq(&bank->gpio_chip, irqd->hwirq); + if (ret) { + dev_err(bank->gpio_chip.dev, "unable to lock pin %s-%lu IRQ\n", + bank->name, irqd->hwirq); + return ret; + } + reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC]; - shift = pin * bank_type->fld_width[PINCFG_TYPE_FUNC]; + shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC]; mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1; spin_lock_irqsave(&bank->slock, flags); @@ -180,9 +200,42 @@ static int exynos_irq_set_type(struct irq_data *irqd, unsigned int type) spin_unlock_irqrestore(&bank->slock, flags); + exynos_irq_unmask(irqd); + return 0; } +static void exynos_irq_shutdown(struct irq_data *irqd) +{ + struct irq_chip *chip = irq_data_get_irq_chip(irqd); + struct exynos_irq_chip *our_chip = to_exynos_irq_chip(chip); + struct samsung_pin_bank *bank = irq_data_get_irq_chip_data(irqd); + struct samsung_pin_bank_type *bank_type = bank->type; + struct samsung_pinctrl_drv_data *d = bank->drvdata; + unsigned int shift = EXYNOS_EINT_CON_LEN * irqd->hwirq; + unsigned long reg_con = our_chip->eint_con + bank->eint_offset; + unsigned long flags; + unsigned int mask; + unsigned int con; + + reg_con = bank->pctl_offset + bank_type->reg_offset[PINCFG_TYPE_FUNC]; + shift = irqd->hwirq * bank_type->fld_width[PINCFG_TYPE_FUNC]; + mask = (1 << bank_type->fld_width[PINCFG_TYPE_FUNC]) - 1; + + exynos_irq_mask(irqd); + + spin_lock_irqsave(&bank->slock, flags); + + con = readl(d->virt_base + reg_con); + con &= ~(mask << shift); + con |= FUNC_INPUT << shift; + writel(con, d->virt_base + reg_con); + + spin_unlock_irqrestore(&bank->slock, flags); + + gpio_unlock_as_irq(&bank->gpio_chip, irqd->hwirq); +} + /* * irq_chip for gpio interrupts. */ @@ -193,6 +246,8 @@ static struct exynos_irq_chip exynos_gpio_irq_chip = { .irq_mask = exynos_irq_mask, .irq_ack = exynos_irq_ack, .irq_set_type = exynos_irq_set_type, + .irq_startup = exynos_irq_startup, + .irq_shutdown = exynos_irq_shutdown, }, .eint_con = EXYNOS_GPIO_ECON_OFFSET, .eint_mask = EXYNOS_GPIO_EMASK_OFFSET, @@ -336,6 +391,8 @@ static struct exynos_irq_chip exynos_wkup_irq_chip = { .irq_ack = exynos_irq_ack, .irq_set_type = exynos_irq_set_type, .irq_set_wake = exynos_wkup_irq_set_wake, + .irq_startup = exynos_irq_startup, + .irq_shutdown = exynos_irq_shutdown, }, .eint_con = EXYNOS_WKUP_ECON_OFFSET, .eint_mask = EXYNOS_WKUP_EMASK_OFFSET, diff --git a/drivers/pinctrl/pinctrl-samsung.h b/drivers/pinctrl/pinctrl-samsung.h index e2dce47..4d7566a 100644 --- a/drivers/pinctrl/pinctrl-samsung.h +++ b/drivers/pinctrl/pinctrl-samsung.h @@ -26,6 +26,7 @@ #include /* pinmux function number for pin as gpio output line */ +#define FUNC_INPUT 0x0 #define FUNC_OUTPUT 0x1 /**