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path: root/drivers/gpio/gpio-vf610.c
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Diffstat (limited to 'drivers/gpio/gpio-vf610.c')
-rw-r--r--drivers/gpio/gpio-vf610.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
new file mode 100644
index 0000000000..656d6b1ddd
--- /dev/null
+++ b/drivers/gpio/gpio-vf610.c
@@ -0,0 +1,361 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Freescale vf610 GPIO support through PORT and GPIO
+ *
+ * Copyright (c) 2014 Toradex AG.
+ *
+ * Author: Stefan Agner <stefan@agner.ch>.
+ */
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/pinctrl/consumer.h>
+
+#define VF610_GPIO_PER_PORT 32
+
+struct fsl_gpio_soc_data {
+ /* SoCs has a Port Data Direction Register (PDDR) */
+ bool have_paddr;
+};
+
+struct vf610_gpio_port {
+ struct gpio_chip gc;
+ void __iomem *base;
+ void __iomem *gpio_base;
+ const struct fsl_gpio_soc_data *sdata;
+ u8 irqc[VF610_GPIO_PER_PORT];
+ struct clk *clk_port;
+ struct clk *clk_gpio;
+ int irq;
+};
+
+#define GPIO_PDOR 0x00
+#define GPIO_PSOR 0x04
+#define GPIO_PCOR 0x08
+#define GPIO_PTOR 0x0c
+#define GPIO_PDIR 0x10
+#define GPIO_PDDR 0x14
+
+#define PORT_PCR(n) ((n) * 0x4)
+#define PORT_PCR_IRQC_OFFSET 16
+
+#define PORT_ISFR 0xa0
+#define PORT_DFER 0xc0
+#define PORT_DFCR 0xc4
+#define PORT_DFWR 0xc8
+
+#define PORT_INT_OFF 0x0
+#define PORT_INT_LOGIC_ZERO 0x8
+#define PORT_INT_RISING_EDGE 0x9
+#define PORT_INT_FALLING_EDGE 0xa
+#define PORT_INT_EITHER_EDGE 0xb
+#define PORT_INT_LOGIC_ONE 0xc
+
+static const struct fsl_gpio_soc_data imx_data = {
+ .have_paddr = true,
+};
+
+static const struct of_device_id vf610_gpio_dt_ids[] = {
+ { .compatible = "fsl,vf610-gpio", .data = NULL, },
+ { .compatible = "fsl,imx7ulp-gpio", .data = &imx_data, },
+ { /* sentinel */ }
+};
+
+static inline void vf610_gpio_writel(u32 val, void __iomem *reg)
+{
+ writel_relaxed(val, reg);
+}
+
+static inline u32 vf610_gpio_readl(void __iomem *reg)
+{
+ return readl_relaxed(reg);
+}
+
+static int vf610_gpio_get(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct vf610_gpio_port *port = gpiochip_get_data(gc);
+ unsigned long mask = BIT(gpio);
+ unsigned long offset = GPIO_PDIR;
+
+ if (port->sdata && port->sdata->have_paddr) {
+ mask &= vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
+ if (mask)
+ offset = GPIO_PDOR;
+ }
+
+ return !!(vf610_gpio_readl(port->gpio_base + offset) & BIT(gpio));
+}
+
+static void vf610_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+ struct vf610_gpio_port *port = gpiochip_get_data(gc);
+ unsigned long mask = BIT(gpio);
+ unsigned long offset = val ? GPIO_PSOR : GPIO_PCOR;
+
+ vf610_gpio_writel(mask, port->gpio_base + offset);
+}
+
+static int vf610_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+ struct vf610_gpio_port *port = gpiochip_get_data(chip);
+ unsigned long mask = BIT(gpio);
+ u32 val;
+
+ if (port->sdata && port->sdata->have_paddr) {
+ val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
+ val &= ~mask;
+ vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
+ }
+
+ return pinctrl_gpio_direction_input(chip->base + gpio);
+}
+
+static int vf610_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
+ int value)
+{
+ struct vf610_gpio_port *port = gpiochip_get_data(chip);
+ unsigned long mask = BIT(gpio);
+ u32 val;
+
+ vf610_gpio_set(chip, gpio, value);
+
+ if (port->sdata && port->sdata->have_paddr) {
+ val = vf610_gpio_readl(port->gpio_base + GPIO_PDDR);
+ val |= mask;
+ vf610_gpio_writel(val, port->gpio_base + GPIO_PDDR);
+ }
+
+ return pinctrl_gpio_direction_output(chip->base + gpio);
+}
+
+static void vf610_gpio_irq_handler(struct irq_desc *desc)
+{
+ struct vf610_gpio_port *port =
+ gpiochip_get_data(irq_desc_get_handler_data(desc));
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ int pin;
+ unsigned long irq_isfr;
+
+ chained_irq_enter(chip, desc);
+
+ irq_isfr = vf610_gpio_readl(port->base + PORT_ISFR);
+
+ for_each_set_bit(pin, &irq_isfr, VF610_GPIO_PER_PORT) {
+ vf610_gpio_writel(BIT(pin), port->base + PORT_ISFR);
+
+ generic_handle_domain_irq(port->gc.irq.domain, pin);
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void vf610_gpio_irq_ack(struct irq_data *d)
+{
+ struct vf610_gpio_port *port =
+ gpiochip_get_data(irq_data_get_irq_chip_data(d));
+ int gpio = d->hwirq;
+
+ vf610_gpio_writel(BIT(gpio), port->base + PORT_ISFR);
+}
+
+static int vf610_gpio_irq_set_type(struct irq_data *d, u32 type)
+{
+ struct vf610_gpio_port *port =
+ gpiochip_get_data(irq_data_get_irq_chip_data(d));
+ u8 irqc;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ irqc = PORT_INT_RISING_EDGE;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ irqc = PORT_INT_FALLING_EDGE;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ irqc = PORT_INT_EITHER_EDGE;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ irqc = PORT_INT_LOGIC_ZERO;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ irqc = PORT_INT_LOGIC_ONE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ port->irqc[d->hwirq] = irqc;
+
+ if (type & IRQ_TYPE_LEVEL_MASK)
+ irq_set_handler_locked(d, handle_level_irq);
+ else
+ irq_set_handler_locked(d, handle_edge_irq);
+
+ return 0;
+}
+
+static void vf610_gpio_irq_mask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct vf610_gpio_port *port = gpiochip_get_data(gc);
+ irq_hw_number_t gpio_num = irqd_to_hwirq(d);
+ void __iomem *pcr_base = port->base + PORT_PCR(gpio_num);
+
+ vf610_gpio_writel(0, pcr_base);
+ gpiochip_disable_irq(gc, gpio_num);
+}
+
+static void vf610_gpio_irq_unmask(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct vf610_gpio_port *port = gpiochip_get_data(gc);
+ irq_hw_number_t gpio_num = irqd_to_hwirq(d);
+ void __iomem *pcr_base = port->base + PORT_PCR(gpio_num);
+
+ gpiochip_enable_irq(gc, gpio_num);
+ vf610_gpio_writel(port->irqc[gpio_num] << PORT_PCR_IRQC_OFFSET,
+ pcr_base);
+}
+
+static int vf610_gpio_irq_set_wake(struct irq_data *d, u32 enable)
+{
+ struct vf610_gpio_port *port =
+ gpiochip_get_data(irq_data_get_irq_chip_data(d));
+
+ if (enable)
+ enable_irq_wake(port->irq);
+ else
+ disable_irq_wake(port->irq);
+
+ return 0;
+}
+
+static const struct irq_chip vf610_irqchip = {
+ .name = "gpio-vf610",
+ .irq_ack = vf610_gpio_irq_ack,
+ .irq_mask = vf610_gpio_irq_mask,
+ .irq_unmask = vf610_gpio_irq_unmask,
+ .irq_set_type = vf610_gpio_irq_set_type,
+ .irq_set_wake = vf610_gpio_irq_set_wake,
+ .flags = IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND
+ | IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
+static void vf610_gpio_disable_clk(void *data)
+{
+ clk_disable_unprepare(data);
+}
+
+static int vf610_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct vf610_gpio_port *port;
+ struct gpio_chip *gc;
+ struct gpio_irq_chip *girq;
+ int i;
+ int ret;
+
+ port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ port->sdata = of_device_get_match_data(dev);
+ port->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(port->base))
+ return PTR_ERR(port->base);
+
+ port->gpio_base = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(port->gpio_base))
+ return PTR_ERR(port->gpio_base);
+
+ port->irq = platform_get_irq(pdev, 0);
+ if (port->irq < 0)
+ return port->irq;
+
+ port->clk_port = devm_clk_get(dev, "port");
+ ret = PTR_ERR_OR_ZERO(port->clk_port);
+ if (!ret) {
+ ret = clk_prepare_enable(port->clk_port);
+ if (ret)
+ return ret;
+ ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk,
+ port->clk_port);
+ if (ret)
+ return ret;
+ } else if (ret == -EPROBE_DEFER) {
+ /*
+ * Percolate deferrals, for anything else,
+ * just live without the clocking.
+ */
+ return ret;
+ }
+
+ port->clk_gpio = devm_clk_get(dev, "gpio");
+ ret = PTR_ERR_OR_ZERO(port->clk_gpio);
+ if (!ret) {
+ ret = clk_prepare_enable(port->clk_gpio);
+ if (ret)
+ return ret;
+ ret = devm_add_action_or_reset(dev, vf610_gpio_disable_clk,
+ port->clk_gpio);
+ if (ret)
+ return ret;
+ } else if (ret == -EPROBE_DEFER) {
+ return ret;
+ }
+
+ gc = &port->gc;
+ gc->parent = dev;
+ gc->label = dev_name(dev);
+ gc->ngpio = VF610_GPIO_PER_PORT;
+ gc->base = -1;
+
+ gc->request = gpiochip_generic_request;
+ gc->free = gpiochip_generic_free;
+ gc->direction_input = vf610_gpio_direction_input;
+ gc->get = vf610_gpio_get;
+ gc->direction_output = vf610_gpio_direction_output;
+ gc->set = vf610_gpio_set;
+
+ /* Mask all GPIO interrupts */
+ for (i = 0; i < gc->ngpio; i++)
+ vf610_gpio_writel(0, port->base + PORT_PCR(i));
+
+ /* Clear the interrupt status register for all GPIO's */
+ vf610_gpio_writel(~0, port->base + PORT_ISFR);
+
+ girq = &gc->irq;
+ gpio_irq_chip_set_chip(girq, &vf610_irqchip);
+ girq->parent_handler = vf610_gpio_irq_handler;
+ girq->num_parents = 1;
+ girq->parents = devm_kcalloc(&pdev->dev, 1,
+ sizeof(*girq->parents),
+ GFP_KERNEL);
+ if (!girq->parents)
+ return -ENOMEM;
+ girq->parents[0] = port->irq;
+ girq->default_type = IRQ_TYPE_NONE;
+ girq->handler = handle_edge_irq;
+
+ return devm_gpiochip_add_data(dev, gc, port);
+}
+
+static struct platform_driver vf610_gpio_driver = {
+ .driver = {
+ .name = "gpio-vf610",
+ .of_match_table = vf610_gpio_dt_ids,
+ },
+ .probe = vf610_gpio_probe,
+};
+
+builtin_platform_driver(vf610_gpio_driver);