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Message-ID: <20220815064244.1296970-2-lewis.hanly@microchip.com>
Date: Mon, 15 Aug 2022 07:42:44 +0100
From: <lewis.hanly@...rochip.com>
To: <linux-gpio@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
<linus.walleij@...aro.org>, <brgl@...ev.pl>,
<linux-kernel@...r.kernel.org>, <palmer@...belt.com>,
<maz@...nel.org>
CC: <conor.dooley@...rochip.com>, <daire.mcnamara@...rochip.com>,
<lewis.hanly@...rochip.com>
Subject: [PATCH v4 1/1] gpio: mpfs: add polarfire soc gpio support
From: Lewis Hanly <lewis.hanly@...rochip.com>
Add a driver to support the Polarfire SoC gpio controller
Signed-off-by: Lewis Hanly <lewis.hanly@...rochip.com>
---
drivers/gpio/Kconfig | 7 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-mpfs.c | 318 +++++++++++++++++++++++++++++++++++++++
3 files changed, 326 insertions(+)
create mode 100644 drivers/gpio/gpio-mpfs.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b01961999ced..72dc23c65ac1 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -490,6 +490,13 @@ 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
+ 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..5f35a5de9e79
--- /dev/null
+++ b/drivers/gpio/gpio-mpfs.c
@@ -0,0 +1,318 @@
+// 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 <lewis.hanly@...rochip.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#define MPFS_GPIO_CTRL(i) (0x4 * (i))
+#define MAX_NUM_GPIO 32
+#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;
+};
+
+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 + MPFS_GPIO_CTRL(gpio_index));
+ gpio_cfg |= MPFS_GPIO_EN_IN;
+ gpio_cfg &= ~(MPFS_GPIO_EN_OUT | MPFS_GPIO_EN_OUT_BUF);
+ writel(gpio_cfg, mpfs_gpio->base + MPFS_GPIO_CTRL(gpio_index));
+
+ 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 + MPFS_GPIO_CTRL(gpio_index));
+ gpio_cfg |= MPFS_GPIO_EN_OUT | MPFS_GPIO_EN_OUT_BUF;
+ gpio_cfg &= ~MPFS_GPIO_EN_IN;
+ writel(gpio_cfg, mpfs_gpio->base + MPFS_GPIO_CTRL(gpio_index));
+
+ 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 + MPFS_GPIO_CTRL(gpio_index));
+ if (gpio_cfg & MPFS_GPIO_EN_IN)
+ return GPIO_LINE_DIRECTION_IN;
+
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+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);
+ struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
+ int gpio_index = irqd_to_hwirq(data);
+ u32 interrupt_type;
+ 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 + MPFS_GPIO_CTRL(gpio_index));
+ gpio_cfg &= ~MPFS_GPIO_TYPE_INT_MASK;
+ gpio_cfg |= interrupt_type;
+ writel(gpio_cfg, mpfs_gpio->base + MPFS_GPIO_CTRL(gpio_index));
+
+ raw_spin_unlock_irqrestore(&mpfs_gpio->lock, flags);
+
+ return 0;
+}
+
+static void mpfs_gpio_irq_unmask(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 gpio_index = irqd_to_hwirq(data) % MAX_NUM_GPIO;
+
+ 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 + MPFS_GPIO_CTRL(gpio_index),
+ MPFS_GPIO_EN_INT, 1);
+}
+
+static void mpfs_gpio_irq_mask(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 gpio_index = irqd_to_hwirq(data) % MAX_NUM_GPIO;
+
+ mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, gpio_index, 1);
+ mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_GPIO_CTRL(gpio_index),
+ MPFS_GPIO_EN_INT, 0);
+}
+
+static struct irq_chip mpfs_gpio_irqchip = {
+ .name = "mpfs_gpio_irqchip",
+ .irq_set_type = mpfs_gpio_irq_set_type,
+ .irq_mask = mpfs_gpio_irq_mask,
+ .irq_unmask = mpfs_gpio_irq_unmask,
+ .flags = IRQCHIP_MASK_ON_SUSPEND,
+};
+
+static void mpfs_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct irq_chip *irqchip = irq_desc_get_chip(desc);
+ struct mpfs_gpio_chip *mpfs_gpio =
+ gpiochip_get_data(irq_desc_get_handler_data(desc));
+ unisgned long status;
+ int offset;
+
+ chained_irq_enter(irqchip, desc);
+
+ status = readl(mpfs_gpio->base + MPFS_IRQ_REG);
+ for_each_set_bit(offset, &status, mpfs_gpio->gc.ngpio) {
+ mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, offset, 1);
+ generic_handle_irq(irq_find_mapping(mpfs_gpio->gc.irq.domain, offset));
+ }
+
+ chained_irq_exit(irqchip, desc);
+}
+
+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 mpfs_gpio_chip *mpfs_gpio;
+ struct gpio_irq_chip *girq;
+ int i, ret, ngpios, nirqs;
+
+ 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 dev_err_probe(dev, PTR_ERR(mpfs_gpio->clk), "input clock not found.\n");
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk))
+ return dev_err_probe(dev, PTR_ERR(clk), "devm_clk_get failed\n");
+
+ ret = clk_prepare_enable(clk);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to enable clock\n");
+
+ mpfs_gpio->clk = clk;
+
+ ngpios = MAX_NUM_GPIO;
+ device_property_read_u32(dev, "ngpios", &ngpios);
+ if (ngpios > MAX_NUM_GPIO)
+ ngpios = MAX_NUM_GPIO;
+
+ 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 = ngpios;
+ mpfs_gpio->gc.label = dev_name(dev);
+ mpfs_gpio->gc.parent = dev;
+ mpfs_gpio->gc.owner = THIS_MODULE;
+
+ nirqs = of_irq_count(node);
+ if (nirqs > MAX_NUM_GPIO) {
+ ret = -ENXIO;
+ goto cleanup_clock;
+ }
+ girq = &mpfs_gpio->gc.irq;
+ gpio_irq_chip_set_chip(girq, &mpfs_gpio_irqchip);
+ girq->chip->parent_device = dev;
+ girq->handler = handle_simple_irq;
+ girq->parent_handler = mpfs_gpio_irq_handler;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->num_parents = nirqs;
+ girq->parents = devm_kcalloc(&pdev->dev, nirqs,
+ sizeof(*girq->parents), GFP_KERNEL);
+ if (!girq->parents) {
+ ret = -ENOMEM;
+ goto cleanup_clock;
+ }
+ for (i = 0; i < nirqs; i++)
+ girq->parents[i] = platform_get_irq(pdev, i);
+
+ ret = gpiochip_add_data(&mpfs_gpio->gc, mpfs_gpio);
+ if (ret)
+ goto cleanup_clock;
+
+ platform_set_drvdata(pdev, mpfs_gpio);
+
+ 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_of_ids[] = {
+ { .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 = mpfs_of_ids,
+ },
+ .remove = mpfs_gpio_remove,
+};
+builtin_platform_driver(mpfs_gpio_driver);
--
2.25.1
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