From patchwork Mon Aug 16 11:59:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 498320 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24851C4338F for ; Mon, 16 Aug 2021 12:01:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B07861CA7 for ; Mon, 16 Aug 2021 12:01:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235483AbhHPMBU (ORCPT ); Mon, 16 Aug 2021 08:01:20 -0400 Received: from mga05.intel.com ([192.55.52.43]:17273 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235199AbhHPMBN (ORCPT ); Mon, 16 Aug 2021 08:01:13 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10077"; a="301429189" X-IronPort-AV: E=Sophos;i="5.84,324,1620716400"; d="scan'208";a="301429189" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2021 05:00:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,324,1620716400"; d="scan'208";a="441058492" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga002.jf.intel.com with ESMTP; 16 Aug 2021 05:00:11 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 268D135D; Mon, 16 Aug 2021 15:00:03 +0300 (EEST) From: Andy Shevchenko To: Andy Shevchenko , David Thompson , linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, netdev@vger.kernel.org, linux-acpi@vger.kernel.org Cc: Linus Walleij , Bartosz Golaszewski , "David S. Miller" , Jakub Kicinski , "Rafael J. Wysocki" , Asmaa Mnebhi , Liming Sun Subject: [PATCH v1 5/6] TODO: gpio: mlxbf2: Introduce IRQ support Date: Mon, 16 Aug 2021 14:59:52 +0300 Message-Id: <20210816115953.72533-6-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210816115953.72533-1-andriy.shevchenko@linux.intel.com> References: <20210816115953.72533-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org TBD Signed-off-by: Andy Shevchenko --- drivers/gpio/gpio-mlxbf2.c | 106 +++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) diff --git a/drivers/gpio/gpio-mlxbf2.c b/drivers/gpio/gpio-mlxbf2.c index 3ed95e958c17..bd4c29120b62 100644 --- a/drivers/gpio/gpio-mlxbf2.c +++ b/drivers/gpio/gpio-mlxbf2.c @@ -43,9 +43,13 @@ #define YU_GPIO_MODE0 0x0c #define YU_GPIO_DATASET 0x14 #define YU_GPIO_DATACLEAR 0x18 +#define YU_GPIO_CAUSE_FALL_EN 0x48 #define YU_GPIO_MODE1_CLEAR 0x50 #define YU_GPIO_MODE0_SET 0x54 #define YU_GPIO_MODE0_CLEAR 0x58 +#define YU_GPIO_CAUSE_OR_CAUSE_EVTEN0 0x80 +#define YU_GPIO_CAUSE_OR_EVTEN0 0x94 +#define YU_GPIO_CAUSE_OR_CLRCAUSE 0x98 struct mlxbf2_gpio_context_save_regs { u32 gpio_mode0; @@ -218,6 +222,108 @@ static int mlxbf2_gpio_direction_output(struct gpio_chip *chip, return ret; } +static void mlxbf2_gpio_irq_enable(struct mlxbf2_gpio_context *gs, int offset) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&gs->gc.bgpio_lock, flags); + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE); + val |= BIT(offset); + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE); + + /* The INT_N interrupt level is active low. + * So enable cause fall bit to detect when GPIO + * state goes low. + */ + val = readl(gs->gpio_io + YU_GPIO_CAUSE_FALL_EN); + val |= BIT(offset); + writel(val, gs->gpio_io + YU_GPIO_CAUSE_FALL_EN); + + /* Enable PHY interrupt by setting the priority level */ + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0); + val |= BIT(offset); + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0); + spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags); +} + +static void mlxbf2_gpio_irq_disable(struct mlxbf2_gpio_context *gs, int offset) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&gs->gc.bgpio_lock, flags); + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0); + val &= ~BIT(offset); + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_EVTEN0); + spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags); +} + +static void mlxbf2_gpio_irq_ack(struct mlxbf2_gpio_context *gs, int offset) +{ + unsigned long flags; + u32 val; + + spin_lock_irqsave(&gs->gc.bgpio_lock, flags); + val = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE); + val |= BIT(offset); + writel(val, gs->gpio_io + YU_GPIO_CAUSE_OR_CLRCAUSE); + spin_unlock_irqrestore(&gs->gc.bgpio_lock, flags); +} + +static irqreturn_t mlxbf2_gpio_irq_handler(int irq, void *ptr) +{ + struct mlxbf2_gpio_context *gs = ptr; + struct gpio_chip *gc = &gs->gc; + unsigned long pending; + u32 level; + + pending = readl(gs->gpio_io + YU_GPIO_CAUSE_OR_CAUSE_EVTEN0); + for_each_set_bit(level, &pending, gc->ngpio) { + int nested_irq = irq_find_mapping(gc->irq.domain, level); + + handle_nested_irq(nested_irq); + } + + return IRQ_RETVAL(pending); +} + +static void mlxbf2_gpio_irq_mask(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc); + int offset = irqd_to_hwirq(irqd) % MLXBF2_GPIO_MAX_PINS_PER_BLOCK; + + mlxbf2_gpio_irq_disable(gs, offset); +} + +static void mlxbf2_gpio_irq_unmask(struct irq_data *irqd) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd); + struct mlxbf2_gpio_context *gs = gpiochip_get_data(gc); + int offset = irqd_to_hwirq(irqd) % MLXBF2_GPIO_MAX_PINS_PER_BLOCK; + + mlxbf2_gpio_irq_enable(gs, offset); +} + +static void mlxbf2_gpio_irq_bus_lock(struct irq_data *irqd) +{ + mutex_lock(yu_arm_gpio_lock_param.lock); +} + +static void mlxbf2_gpio_irq_bus_sync_unlock(struct irq_data *irqd) +{ + mutex_unlock(yu_arm_gpio_lock_param.lock); +} + +static struct irq_chip mlxbf2_gpio_irq_chip = { + .name = "mlxbf2_gpio", + .irq_mask = mlxbf2_gpio_irq_mask, + .irq_unmask = mlxbf2_gpio_irq_unmask, + .irq_bus_lock = mlxbf2_gpio_irq_bus_lock, + .irq_bus_sync_unlock = mlxbf2_gpio_irq_bus_sync_unlock, +}; + /* BlueField-2 GPIO driver initialization routine. */ static int mlxbf2_gpio_probe(struct platform_device *pdev)