From patchwork Wed Jul 13 10:59:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lewis Hanly X-Patchwork-Id: 12916549 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2F680C43334 for ; Wed, 13 Jul 2022 11:00:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Lzekr47xgRs5s8xWh6Cnk+hARPw3jeEk9/xhPC8Q7UM=; b=O9MlPP8O3KYEvm wUxliyMefS+i9ZTGjnOVNd5Z3AZTTEb8nOfpD81S4+mJdTTDIgzU1IFBBpzfo2Y3aSq8DWS6mCgqB +VVm17hYJeQRGnjmCVI1A12MRbR+Ng39GBqoy/bIgQ0wFAL6copbBOPkcnsMhZMj5lKC0v/uTZYeu rVii3ACiDEFdwMjkB6BTy/wYFb8dDISHjwPhPRTXsCr2ivEg1HesSNZULjPk1wspUeS8Dv3G6LHv9 GS2DnPlvYS/l2wfqeA5tuKXrMgq+N4k06NTQ+0ntoNumW7UK7e6DZSi7jfaKQYOtH0ExF5+A3UrKK xBguDcQBcCQH+gVYSDRw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oBa6C-002shE-7l; Wed, 13 Jul 2022 11:00:08 +0000 Received: from esa.microchip.iphmx.com ([68.232.154.123]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oBa5s-002sQl-4o for linux-riscv@lists.infradead.org; Wed, 13 Jul 2022 10:59:50 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1657709988; x=1689245988; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=oSYsOPfZMoigSP2H0A0eZeabJWNryj/ppmrEjwDGK3o=; b=aW3lVI1IB+mEZrss2ShonyKHNySYMve2R/YIb6i/cpx0OxUX53iRj5iI IZZPXbrpOe/jO1r7MORHI+1Ws70ujG1ecu6NQ/luLELdK0LOV8QmboPcv zImZJ1ih7HacTEKeQSuA3aWUqmYPa58dO8GOxMybZOFbG6VrLWF0xapjA ikrsY98Zsles6+18v6iwWgBl9wmVljQQ4+QycxFR7nxs4I36Ze/rojxE5 6pTbxkw6yvbvMoFq0EcURXUZiuv3KkXL6DxXL2+4PjHitMwT/tol7ah75 l3EzY6dlDbEdpvN05NEVTFumnySlnV2k0j8tncmqVEel6Y/X2zYFPzSgC g==; X-IronPort-AV: E=Sophos;i="5.92,267,1650956400"; d="scan'208";a="164527558" Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 13 Jul 2022 03:59:38 -0700 Received: from chn-vm-ex03.mchp-main.com (10.10.85.151) by chn-vm-ex01.mchp-main.com (10.10.85.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Wed, 13 Jul 2022 03:59:35 -0700 Received: from dev-powerhorse.microchip.com (10.10.115.15) by chn-vm-ex03.mchp-main.com (10.10.85.151) with Microsoft SMTP Server id 15.1.2375.17 via Frontend Transport; Wed, 13 Jul 2022 03:59:33 -0700 From: To: , , , , , , CC: , , Subject: [PATCH v2 1/1] gpio: mpfs: add polarfire soc gpio support Date: Wed, 13 Jul 2022 11:59:10 +0100 Message-ID: <20220713105910.931983-2-lewis.hanly@microchip.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220713105910.931983-1-lewis.hanly@microchip.com> References: <20220713105910.931983-1-lewis.hanly@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220713_035948_360217_73DEE625 X-CRM114-Status: GOOD ( 24.20 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Lewis Hanly Add a driver to support the Polarfire SoC gpio controller. Signed-off-by: Lewis Hanly --- drivers/gpio/Kconfig | 9 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-mpfs.c | 379 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 389 insertions(+) create mode 100644 drivers/gpio/gpio-mpfs.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index b01961999ced..004b377b73f6 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -490,6 +490,15 @@ config GPIO_PMIC_EIC_SPRD help Say yes here to support Spreadtrum PMIC EIC device. +config GPIO_POLARFIRE_SOC + bool "Microchip FPGA GPIO support" + depends on OF_GPIO + select GPIOLIB_IRQCHIP + select IRQ_DOMAIN_HIERARCHY + select GPIO_GENERIC + help + Say yes here to support the GPIO device on Microchip FPGAs. + config GPIO_PXA bool "PXA GPIO support" depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 14352f6dfe8e..3b8b6703e593 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -119,6 +119,7 @@ obj-$(CONFIG_GPIO_PCI_IDIO_16) += gpio-pci-idio-16.o obj-$(CONFIG_GPIO_PISOSR) += gpio-pisosr.o obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o obj-$(CONFIG_GPIO_PMIC_EIC_SPRD) += gpio-pmic-eic-sprd.o +obj-$(CONFIG_GPIO_POLARFIRE_SOC) += gpio-mpfs.o obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o obj-$(CONFIG_GPIO_RASPBERRYPI_EXP) += gpio-raspberrypi-exp.o obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o diff --git a/drivers/gpio/gpio-mpfs.c b/drivers/gpio/gpio-mpfs.c new file mode 100644 index 000000000000..1b342f307d85 --- /dev/null +++ b/drivers/gpio/gpio-mpfs.c @@ -0,0 +1,379 @@ +// SPDX-License-Identifier: (GPL-2.0) +/* + * Microchip PolarFire SoC (MPFS) GPIO controller driver + * + * Copyright (c) 2018-2022 Microchip Technology Inc. and its subsidiaries + * + * Author: Lewis Hanly + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define NUM_GPIO 32 +#define BYTE_BOUNDARY 0x04 +#define MPFS_GPIO_EN_INT 3 +#define MPFS_GPIO_EN_OUT_BUF BIT(2) +#define MPFS_GPIO_EN_IN BIT(1) +#define MPFS_GPIO_EN_OUT BIT(0) + +#define MPFS_GPIO_TYPE_INT_EDGE_BOTH 0x80 +#define MPFS_GPIO_TYPE_INT_EDGE_NEG 0x60 +#define MPFS_GPIO_TYPE_INT_EDGE_POS 0x40 +#define MPFS_GPIO_TYPE_INT_LEVEL_LOW 0x20 +#define MPFS_GPIO_TYPE_INT_LEVEL_HIGH 0x00 +#define MPFS_GPIO_TYPE_INT_MASK GENMASK(7, 5) +#define MPFS_IRQ_REG 0x80 +#define MPFS_INP_REG 0x84 +#define MPFS_OUTP_REG 0x88 + +struct mpfs_gpio_chip { + void __iomem *base; + struct clk *clk; + raw_spinlock_t lock; + struct gpio_chip gc; + unsigned int irq_number[NUM_GPIO]; +}; + +static void mpfs_gpio_assign_bit(void __iomem *addr, unsigned int bit_offset, bool value) +{ + unsigned long reg = readl(addr); + + __assign_bit(bit_offset, ®, value); + writel(reg, addr); +} + +static int mpfs_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio_index) +{ + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + u32 gpio_cfg; + unsigned long flags; + + raw_spin_lock_irqsave(&mpfs_gpio->lock, flags); + + gpio_cfg = readl(mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + gpio_cfg |= MPFS_GPIO_EN_IN; + gpio_cfg &= ~(MPFS_GPIO_EN_OUT | MPFS_GPIO_EN_OUT_BUF); + writel(gpio_cfg, mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + + raw_spin_unlock_irqrestore(&mpfs_gpio->lock, flags); + + return 0; +} + +static int mpfs_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio_index, int value) +{ + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + u32 gpio_cfg; + unsigned long flags; + + raw_spin_lock_irqsave(&mpfs_gpio->lock, flags); + + gpio_cfg = readl(mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + gpio_cfg |= MPFS_GPIO_EN_OUT | MPFS_GPIO_EN_OUT_BUF; + gpio_cfg &= ~MPFS_GPIO_EN_IN; + writel(gpio_cfg, mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + + mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_OUTP_REG, gpio_index, value); + + raw_spin_unlock_irqrestore(&mpfs_gpio->lock, flags); + + return 0; +} + +static int mpfs_gpio_get_direction(struct gpio_chip *gc, + unsigned int gpio_index) +{ + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + u32 gpio_cfg; + + gpio_cfg = readl(mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + + if (gpio_cfg & MPFS_GPIO_EN_IN) + return 1; + + return 0; +} + +static int mpfs_gpio_get(struct gpio_chip *gc, + unsigned int gpio_index) +{ + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + + return !!(readl(mpfs_gpio->base + MPFS_INP_REG) & BIT(gpio_index)); +} + +static void mpfs_gpio_set(struct gpio_chip *gc, unsigned int gpio_index, int value) +{ + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + unsigned long flags; + + raw_spin_lock_irqsave(&mpfs_gpio->lock, flags); + + mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_OUTP_REG, + gpio_index, value); + + raw_spin_unlock_irqrestore(&mpfs_gpio->lock, flags); +} + +static int mpfs_gpio_irq_set_type(struct irq_data *data, unsigned int type) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + int gpio_index = irqd_to_hwirq(data); + u32 interrupt_type; + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + u32 gpio_cfg; + unsigned long flags; + + switch (type) { + case IRQ_TYPE_EDGE_BOTH: + interrupt_type = MPFS_GPIO_TYPE_INT_EDGE_BOTH; + break; + + case IRQ_TYPE_EDGE_FALLING: + interrupt_type = MPFS_GPIO_TYPE_INT_EDGE_NEG; + break; + + case IRQ_TYPE_EDGE_RISING: + interrupt_type = MPFS_GPIO_TYPE_INT_EDGE_POS; + break; + + case IRQ_TYPE_LEVEL_HIGH: + interrupt_type = MPFS_GPIO_TYPE_INT_LEVEL_HIGH; + break; + + case IRQ_TYPE_LEVEL_LOW: + interrupt_type = MPFS_GPIO_TYPE_INT_LEVEL_LOW; + break; + } + + raw_spin_lock_irqsave(&mpfs_gpio->lock, flags); + + gpio_cfg = readl(mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + gpio_cfg &= ~MPFS_GPIO_TYPE_INT_MASK; + gpio_cfg |= interrupt_type; + writel(gpio_cfg, mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY)); + + raw_spin_unlock_irqrestore(&mpfs_gpio->lock, flags); + + return 0; +} + +static void mpfs_gpio_irq_enable(struct irq_data *data) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + irq_hw_number_t hwirq = irqd_to_hwirq(data); + int gpio_index = hwirq % NUM_GPIO; + + gpiochip_enable_irq(gc, hwirq); + irq_chip_enable_parent(data); + + mpfs_gpio_direction_input(gc, gpio_index); + mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, gpio_index, 1); + mpfs_gpio_assign_bit(mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY), + MPFS_GPIO_EN_INT, 1); +} + +static void mpfs_gpio_irq_disable(struct irq_data *data) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + irq_hw_number_t hwirq = irqd_to_hwirq(data); + int gpio_index = hwirq % NUM_GPIO; + + mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, gpio_index, 1); + mpfs_gpio_assign_bit(mpfs_gpio->base + (gpio_index * BYTE_BOUNDARY), + MPFS_GPIO_EN_INT, 0); + + irq_chip_disable_parent(data); + gpiochip_disable_irq(gc, hwirq); +} + +static void mpfs_gpio_irq_eoi(struct irq_data *data) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(data); + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + int offset = irqd_to_hwirq(data) % NUM_GPIO; + unsigned long flags; + + raw_spin_lock_irqsave(&mpfs_gpio->lock, flags); + /* Clear pending interrupt */ + mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, offset, 1); + raw_spin_unlock_irqrestore(&mpfs_gpio->lock, flags); + + irq_chip_eoi_parent(data); +} + +static int mpfs_gpio_irq_set_affinity(struct irq_data *data, + const struct cpumask *dest, + bool force) +{ + if (data->parent_data) + return irq_chip_set_affinity_parent(data, dest, force); + + return -EINVAL; +} + +static const struct irq_chip mpfs_gpio_irqchip = { + .name = "mpfs", + .irq_set_type = mpfs_gpio_irq_set_type, + .irq_mask = irq_chip_mask_parent, + .irq_unmask = irq_chip_unmask_parent, + .irq_enable = mpfs_gpio_irq_enable, + .irq_disable = mpfs_gpio_irq_disable, + .irq_eoi = mpfs_gpio_irq_eoi, + .irq_set_affinity = mpfs_gpio_irq_set_affinity, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static int mpfs_gpio_child_to_parent_hwirq(struct gpio_chip *gc, + unsigned int child, + unsigned int child_type, + unsigned int *parent, + unsigned int *parent_type) +{ + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc); + struct irq_data *d = irq_get_irq_data(mpfs_gpio->irq_number[child]); + *parent_type = IRQ_TYPE_NONE; + *parent = irqd_to_hwirq(d); + + return 0; +} + +static int mpfs_gpio_probe(struct platform_device *pdev) +{ + struct clk *clk; + struct device *dev = &pdev->dev; + struct device_node *node = pdev->dev.of_node; + struct device_node *irq_parent; + struct gpio_irq_chip *girq; + struct irq_domain *parent; + struct mpfs_gpio_chip *mpfs_gpio; + int i, ret, ngpio; + + mpfs_gpio = devm_kzalloc(dev, sizeof(*mpfs_gpio), GFP_KERNEL); + if (!mpfs_gpio) + return -ENOMEM; + + mpfs_gpio->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(mpfs_gpio->base)) + return PTR_ERR(mpfs_gpio->base); + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "devm_clk_get failed\n"); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock\n"); + return ret; + } + + mpfs_gpio->clk = clk; + + ngpio = of_irq_count(node); + if (ngpio > NUM_GPIO) { + dev_err(dev, "Too many GPIO interrupts (max=%d)\n", + NUM_GPIO); + ret = -ENXIO; + goto cleanup_clock; + } + + irq_parent = of_irq_find_parent(node); + if (!irq_parent) { + dev_err(dev, "no IRQ parent node\n"); + ret = -ENODEV; + goto cleanup_clock; + } + parent = irq_find_host(irq_parent); + if (!parent) { + dev_err(dev, "no IRQ parent domain\n"); + ret = -ENODEV; + goto cleanup_clock; + } + + /* Get the interrupt numbers. + * Clear/Disable All interrupts before enabling parent interrupts. + */ + for (i = 0; i < ngpio; i++) { + mpfs_gpio->irq_number[i] = platform_get_irq(pdev, i); + mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, i, 1); + mpfs_gpio_assign_bit(mpfs_gpio->base + (i * BYTE_BOUNDARY), + MPFS_GPIO_EN_INT, 0); + } + + raw_spin_lock_init(&mpfs_gpio->lock); + + mpfs_gpio->gc.direction_input = mpfs_gpio_direction_input; + mpfs_gpio->gc.direction_output = mpfs_gpio_direction_output; + mpfs_gpio->gc.get_direction = mpfs_gpio_get_direction; + mpfs_gpio->gc.get = mpfs_gpio_get; + mpfs_gpio->gc.set = mpfs_gpio_set; + mpfs_gpio->gc.base = -1; + mpfs_gpio->gc.ngpio = ngpio; + mpfs_gpio->gc.label = dev_name(dev); + mpfs_gpio->gc.parent = dev; + mpfs_gpio->gc.owner = THIS_MODULE; + + /* Get a pointer to the gpio_irq_chip */ + girq = &mpfs_gpio->gc.irq; + gpio_irq_chip_set_chip(girq, &mpfs_gpio_irqchip); + girq->fwnode = of_node_to_fwnode(node); + girq->parent_domain = parent; + girq->child_to_parent_hwirq = mpfs_gpio_child_to_parent_hwirq; + girq->handler = handle_bad_irq; + girq->default_type = IRQ_TYPE_NONE; + + ret = gpiochip_add_data(&mpfs_gpio->gc, mpfs_gpio); + if (ret) + goto cleanup_clock; + + platform_set_drvdata(pdev, mpfs_gpio); + dev_info(dev, "Microchip MPFS GPIO registered, ngpio=%d\n", ngpio); + + return 0; + +cleanup_clock: + clk_disable_unprepare(mpfs_gpio->clk); + return ret; +} + +static int mpfs_gpio_remove(struct platform_device *pdev) +{ + struct mpfs_gpio_chip *mpfs_gpio = platform_get_drvdata(pdev); + + gpiochip_remove(&mpfs_gpio->gc); + clk_disable_unprepare(mpfs_gpio->clk); + + return 0; +} + +static const struct of_device_id mpfs_gpio_match[] = { + { .compatible = "microchip,mpfs-gpio", }, + { /* end of list */ }, +}; + +static struct platform_driver mpfs_gpio_driver = { + .probe = mpfs_gpio_probe, + .driver = { + .name = "microchip,mpfs-gpio", + .of_match_table = of_match_ptr(mpfs_gpio_match), + }, + .remove = mpfs_gpio_remove, +}; +builtin_platform_driver(mpfs_gpio_driver)