--- /dev/null
+/*
+ * U300 GPIO module.
+ *
+ * Copyright (C) 2007-2012 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
+ */
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include "pinctrl-coh901.h"
+
+#define U300_GPIO_PORT_STRIDE (0x30)
+/*
+ * Control Register 32bit (R/W)
+ * bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores
+ * gives the number of GPIO pins.
+ * bit 8-2 (mask 0x000001FC) contains the core version ID.
+ */
+#define U300_GPIO_CR (0x00)
+#define U300_GPIO_CR_SYNC_SEL_ENABLE (0x00000002UL)
+#define U300_GPIO_CR_BLOCK_CLKRQ_ENABLE (0x00000001UL)
+#define U300_GPIO_PXPDIR (0x04)
+#define U300_GPIO_PXPDOR (0x08)
+#define U300_GPIO_PXPCR (0x0C)
+#define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK (0x0000FFFFUL)
+#define U300_GPIO_PXPCR_PIN_MODE_MASK (0x00000003UL)
+#define U300_GPIO_PXPCR_PIN_MODE_SHIFT (0x00000002UL)
+#define U300_GPIO_PXPCR_PIN_MODE_INPUT (0x00000000UL)
+#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL (0x00000001UL)
+#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN (0x00000002UL)
+#define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE (0x00000003UL)
+#define U300_GPIO_PXPER (0x10)
+#define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK (0x000000FFUL)
+#define U300_GPIO_PXPER_PULL_UP_DISABLE (0x00000001UL)
+#define U300_GPIO_PXIEV (0x14)
+#define U300_GPIO_PXIEN (0x18)
+#define U300_GPIO_PXIFR (0x1C)
+#define U300_GPIO_PXICR (0x20)
+#define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK (0x000000FFUL)
+#define U300_GPIO_PXICR_IRQ_CONFIG_MASK (0x00000001UL)
+#define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE (0x00000000UL)
+#define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE (0x00000001UL)
+
+/* 8 bits per port, no version has more than 7 ports */
+#define U300_GPIO_NUM_PORTS 7
+#define U300_GPIO_PINS_PER_PORT 8
+#define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS)
+
+struct u300_gpio_port {
+ struct u300_gpio *gpio;
+ char name[8];
+ int irq;
+ int number;
+ u8 toggle_edge_mode;
+};
+
+struct u300_gpio {
+ struct gpio_chip chip;
+ struct u300_gpio_port ports[U300_GPIO_NUM_PORTS];
+ struct clk *clk;
+ void __iomem *base;
+ struct device *dev;
+ u32 stride;
+ /* Register offsets */
+ u32 pcr;
+ u32 dor;
+ u32 dir;
+ u32 per;
+ u32 icr;
+ u32 ien;
+ u32 iev;
+};
+
+/*
+ * Macro to expand to read a specific register found in the "gpio"
+ * struct. It requires the struct u300_gpio *gpio variable to exist in
+ * its context. It calculates the port offset from the given pin
+ * offset, muliplies by the port stride and adds the register offset
+ * so it provides a pointer to the desired register.
+ */
+#define U300_PIN_REG(pin, reg) \
+ (gpio->base + (pin >> 3) * gpio->stride + gpio->reg)
+
+/*
+ * Provides a bitmask for a specific gpio pin inside an 8-bit GPIO
+ * register.
+ */
+#define U300_PIN_BIT(pin) \
+ (1 << (pin & 0x07))
+
+struct u300_gpio_confdata {
+ u16 bias_mode;
+ bool output;
+ int outval;
+};
+
+#define U300_FLOATING_INPUT { \
+ .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \
+ .output = false, \
+}
+
+#define U300_PULL_UP_INPUT { \
+ .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \
+ .output = false, \
+}
+
+#define U300_OUTPUT_LOW { \
+ .output = true, \
+ .outval = 0, \
+}
+
+#define U300_OUTPUT_HIGH { \
+ .output = true, \
+ .outval = 1, \
+}
+
+/* Initial configuration */
+static const struct __initconst u300_gpio_confdata
+bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
+ /* Port 0, pins 0-7 */
+ {
+ U300_FLOATING_INPUT,
+ U300_OUTPUT_HIGH,
+ U300_FLOATING_INPUT,
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ },
+ /* Port 1, pins 0-7 */
+ {
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ U300_PULL_UP_INPUT,
+ U300_FLOATING_INPUT,
+ U300_OUTPUT_HIGH,
+ U300_OUTPUT_LOW,
+ U300_OUTPUT_LOW,
+ },
+ /* Port 2, pins 0-7 */
+ {
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_OUTPUT_LOW,
+ U300_PULL_UP_INPUT,
+ U300_OUTPUT_LOW,
+ U300_PULL_UP_INPUT,
+ },
+ /* Port 3, pins 0-7 */
+ {
+ U300_PULL_UP_INPUT,
+ U300_OUTPUT_LOW,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ },
+ /* Port 4, pins 0-7 */
+ {
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ },
+ /* Port 5, pins 0-7 */
+ {
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ },
+ /* Port 6, pind 0-7 */
+ {
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ U300_FLOATING_INPUT,
+ }
+};
+
+/**
+ * to_u300_gpio() - get the pointer to u300_gpio
+ * @chip: the gpio chip member of the structure u300_gpio
+ */
+static inline struct u300_gpio *to_u300_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct u300_gpio, chip);
+}
+
+static int u300_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ /*
+ * Map back to global GPIO space and request muxing, the direction
+ * parameter does not matter for this controller.
+ */
+ int gpio = chip->base + offset;
+
+ return pinctrl_request_gpio(gpio);
+}
+
+static void u300_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ int gpio = chip->base + offset;
+
+ pinctrl_free_gpio(gpio);
+}
+
+static int u300_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+
+ return readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset);
+}
+
+static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ unsigned long flags;
+ u32 val;
+
+ local_irq_save(flags);
+
+ val = readl(U300_PIN_REG(offset, dor));
+ if (value)
+ writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
+ else
+ writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
+
+ local_irq_restore(flags);
+}
+
+static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ unsigned long flags;
+ u32 val;
+
+ local_irq_save(flags);
+ val = readl(U300_PIN_REG(offset, pcr));
+ /* Mask out this pin, note 2 bits per setting */
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
+ writel(val, U300_PIN_REG(offset, pcr));
+ local_irq_restore(flags);
+ return 0;
+}
+
+static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ unsigned long flags;
+ u32 oldmode;
+ u32 val;
+
+ local_irq_save(flags);
+ val = readl(U300_PIN_REG(offset, pcr));
+ /*
+ * Drive mode must be set by the special mode set function, set
+ * push/pull mode by default if no mode has been selected.
+ */
+ oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK <<
+ ((offset & 0x07) << 1));
+ /* mode = 0 means input, else some mode is already set */
+ if (oldmode == 0) {
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK <<
+ ((offset & 0x07) << 1));
+ val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
+ << ((offset & 0x07) << 1));
+ writel(val, U300_PIN_REG(offset, pcr));
+ }
+ u300_gpio_set(chip, offset, value);
+ local_irq_restore(flags);
+ return 0;
+}
+
+/* Returning -EINVAL means "supported but not available" */
+int u300_gpio_config_get(struct gpio_chip *chip,
+ unsigned offset,
+ unsigned long *config)
+{
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ enum pin_config_param param = (enum pin_config_param) *config;
+ bool biasmode;
+ u32 drmode;
+
+ /* One bit per pin, clamp to bool range */
+ biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset));
+
+ /* Mask out the two bits for this pin and shift to bits 0,1 */
+ drmode = readl(U300_PIN_REG(offset, pcr));
+ drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
+ drmode >>= ((offset & 0x07) << 1);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+ *config = 0;
+ if (biasmode)
+ return 0;
+ else
+ return -EINVAL;
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ *config = 0;
+ if (!biasmode)
+ return 0;
+ else
+ return -EINVAL;
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ *config = 0;
+ if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL)
+ return 0;
+ else
+ return -EINVAL;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ *config = 0;
+ if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN)
+ return 0;
+ else
+ return -EINVAL;
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_SOURCE:
+ *config = 0;
+ if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE)
+ return 0;
+ else
+ return -EINVAL;
+ break;
+ default:
+ break;
+ }
+ return -ENOTSUPP;
+}
+
+int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset,
+ enum pin_config_param param)
+{
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ unsigned long flags;
+ u32 val;
+
+ local_irq_save(flags);
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
+ val = readl(U300_PIN_REG(offset, per));
+ writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
+ break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ val = readl(U300_PIN_REG(offset, per));
+ writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ val = readl(U300_PIN_REG(offset, pcr));
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
+ << ((offset & 0x07) << 1));
+ val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
+ << ((offset & 0x07) << 1));
+ writel(val, U300_PIN_REG(offset, pcr));
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ val = readl(U300_PIN_REG(offset, pcr));
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
+ << ((offset & 0x07) << 1));
+ val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN
+ << ((offset & 0x07) << 1));
+ writel(val, U300_PIN_REG(offset, pcr));
+ break;
+ case PIN_CONFIG_DRIVE_OPEN_SOURCE:
+ val = readl(U300_PIN_REG(offset, pcr));
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
+ << ((offset & 0x07) << 1));
+ val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE
+ << ((offset & 0x07) << 1));
+ writel(val, U300_PIN_REG(offset, pcr));
+ break;
+ default:
+ local_irq_restore(flags);
+ dev_err(gpio->dev, "illegal configuration requested\n");
+ return -EINVAL;
+ }
+ local_irq_restore(flags);
+ return 0;
+}
+
+static struct gpio_chip u300_gpio_chip = {
+ .label = "u300-gpio-chip",
+ .owner = THIS_MODULE,
+ .request = u300_gpio_request,
+ .free = u300_gpio_free,
+ .get = u300_gpio_get,
+ .set = u300_gpio_set,
+ .direction_input = u300_gpio_direction_input,
+ .direction_output = u300_gpio_direction_output,
+};
+
+static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
+{
+ u32 val;
+
+ val = readl(U300_PIN_REG(offset, icr));
+ /* Set mode depending on state */
+ if (u300_gpio_get(&gpio->chip, offset)) {
+ /* High now, let's trigger on falling edge next then */
+ writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
+ dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n",
+ offset);
+ } else {
+ /* Low now, let's trigger on rising edge next then */
+ writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
+ dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n",
+ offset);
+ }
+}
+
+static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
+ int offset = d->hwirq;
+ u32 val;
+
+ if ((trigger & IRQF_TRIGGER_RISING) &&
+ (trigger & IRQF_TRIGGER_FALLING)) {
+ /*
+ * The GPIO block can only trigger on falling OR rising edges,
+ * not both. So we need to toggle the mode whenever the pin
+ * goes from one state to the other with a special state flag
+ */
+ dev_dbg(gpio->dev,
+ "trigger on both rising and falling edge on pin %d\n",
+ offset);
+ port->toggle_edge_mode |= U300_PIN_BIT(offset);
+ u300_toggle_trigger(gpio, offset);
+ } else if (trigger & IRQF_TRIGGER_RISING) {
+ dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n",
+ offset);
+ val = readl(U300_PIN_REG(offset, icr));
+ writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
+ port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
+ } else if (trigger & IRQF_TRIGGER_FALLING) {
+ dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n",
+ offset);
+ val = readl(U300_PIN_REG(offset, icr));
+ writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
+ port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
+ }
+
+ return 0;
+}
+
+static void u300_gpio_irq_enable(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
+ int offset = d->hwirq;
+ u32 val;
+ unsigned long flags;
+
+ dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n",
+ d->hwirq, port->name, offset);
+ local_irq_save(flags);
+ val = readl(U300_PIN_REG(offset, ien));
+ writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
+ local_irq_restore(flags);
+}
+
+static void u300_gpio_irq_disable(struct irq_data *d)
+{
+ struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ int offset = d->hwirq;
+ u32 val;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ val = readl(U300_PIN_REG(offset, ien));
+ writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
+ local_irq_restore(flags);
+}
+
+static struct irq_chip u300_gpio_irqchip = {
+ .name = "u300-gpio-irqchip",
+ .irq_enable = u300_gpio_irq_enable,
+ .irq_disable = u300_gpio_irq_disable,
+ .irq_set_type = u300_gpio_irq_type,
+};
+
+static void u300_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ struct irq_chip *parent_chip = irq_get_chip(irq);
+ struct gpio_chip *chip = irq_get_handler_data(irq);
+ struct u300_gpio *gpio = to_u300_gpio(chip);
+ struct u300_gpio_port *port = &gpio->ports[irq - chip->base];
+ int pinoffset = port->number << 3; /* get the right stride */
+ unsigned long val;
+
+ chained_irq_enter(parent_chip, desc);
+
+ /* Read event register */
+ val = readl(U300_PIN_REG(pinoffset, iev));
+ /* Mask relevant bits */
+ val &= 0xFFU; /* 8 bits per port */
+ /* ACK IRQ (clear event) */
+ writel(val, U300_PIN_REG(pinoffset, iev));
+
+ /* Call IRQ handler */
+ if (val != 0) {
+ int irqoffset;
+
+ for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
+ int offset = pinoffset + irqoffset;
+ int pin_irq = irq_find_mapping(chip->irqdomain, offset);
+
+ dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
+ pin_irq, offset);
+ generic_handle_irq(pin_irq);
+ /*
+ * Triggering IRQ on both rising and falling edge
+ * needs mockery
+ */
+ if (port->toggle_edge_mode & U300_PIN_BIT(offset))
+ u300_toggle_trigger(gpio, offset);
+ }
+ }
+
+ chained_irq_exit(parent_chip, desc);
+}
+
+static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
+ int offset,
+ const struct u300_gpio_confdata *conf)
+{
+ /* Set mode: input or output */
+ if (conf->output) {
+ u300_gpio_direction_output(&gpio->chip, offset, conf->outval);
+
+ /* Deactivate bias mode for output */
+ u300_gpio_config_set(&gpio->chip, offset,
+ PIN_CONFIG_BIAS_HIGH_IMPEDANCE);
+
+ /* Set drive mode for output */
+ u300_gpio_config_set(&gpio->chip, offset,
+ PIN_CONFIG_DRIVE_PUSH_PULL);
+
+ dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n",
+ offset, conf->outval);
+ } else {
+ u300_gpio_direction_input(&gpio->chip, offset);
+
+ /* Always set output low on input pins */
+ u300_gpio_set(&gpio->chip, offset, 0);
+
+ /* Set bias mode for input */
+ u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode);
+
+ dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n",
+ offset, conf->bias_mode);
+ }
+}
+
+static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio)
+{
+ int i, j;
+
+ /* Write default config and values to all pins */
+ for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
+ for (j = 0; j < 8; j++) {
+ const struct u300_gpio_confdata *conf;
+ int offset = (i*8) + j;
+
+ conf = &bs335_gpio_config[i][j];
+ u300_gpio_init_pin(gpio, offset, conf);
+ }
+ }
+}
+
+/*
+ * Here we map a GPIO in the local gpio_chip pin space to a pin in
+ * the local pinctrl pin space. The pin controller used is
+ * pinctrl-u300.
+ */
+struct coh901_pinpair {
+ unsigned int offset;
+ unsigned int pin_base;
+};
+
+#define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b }
+
+static struct coh901_pinpair coh901_pintable[] = {
+ COH901_PINRANGE(10, 426),
+ COH901_PINRANGE(11, 180),
+ COH901_PINRANGE(12, 165), /* MS/MMC card insertion */
+ COH901_PINRANGE(13, 179),
+ COH901_PINRANGE(14, 178),
+ COH901_PINRANGE(16, 194),
+ COH901_PINRANGE(17, 193),
+ COH901_PINRANGE(18, 192),
+ COH901_PINRANGE(19, 191),
+ COH901_PINRANGE(20, 186),
+ COH901_PINRANGE(21, 185),
+ COH901_PINRANGE(22, 184),
+ COH901_PINRANGE(23, 183),
+ COH901_PINRANGE(24, 182),
+ COH901_PINRANGE(25, 181),
+};
+
+static int __init u300_gpio_probe(struct platform_device *pdev)
+{
+ struct u300_gpio *gpio;
+ struct resource *memres;
+ int err = 0;
+ int portno;
+ u32 val;
+ u32 ifr;
+ int i;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL);
+ if (gpio == NULL)
+ return -ENOMEM;
+
+ gpio->chip = u300_gpio_chip;
+ gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT;
+ gpio->chip.dev = &pdev->dev;
+ gpio->chip.base = 0;
+ gpio->dev = &pdev->dev;
+
+ memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ gpio->base = devm_ioremap_resource(&pdev->dev, memres);
+ if (IS_ERR(gpio->base))
+ return PTR_ERR(gpio->base);
+
+ gpio->clk = devm_clk_get(gpio->dev, NULL);
+ if (IS_ERR(gpio->clk)) {
+ err = PTR_ERR(gpio->clk);
+ dev_err(gpio->dev, "could not get GPIO clock\n");
+ return err;
+ }
+
+ err = clk_prepare_enable(gpio->clk);
+ if (err) {
+ dev_err(gpio->dev, "could not enable GPIO clock\n");
+ return err;
+ }
+
+ dev_info(gpio->dev,
+ "initializing GPIO Controller COH 901 571/3\n");
+ gpio->stride = U300_GPIO_PORT_STRIDE;
+ gpio->pcr = U300_GPIO_PXPCR;
+ gpio->dor = U300_GPIO_PXPDOR;
+ gpio->dir = U300_GPIO_PXPDIR;
+ gpio->per = U300_GPIO_PXPER;
+ gpio->icr = U300_GPIO_PXICR;
+ gpio->ien = U300_GPIO_PXIEN;
+ gpio->iev = U300_GPIO_PXIEV;
+ ifr = U300_GPIO_PXIFR;
+
+ val = readl(gpio->base + U300_GPIO_CR);
+ dev_info(gpio->dev, "COH901571/3 block version: %d, " \
+ "number of cores: %d totalling %d pins\n",
+ ((val & 0x000001FC) >> 2),
+ ((val & 0x0000FE00) >> 9),
+ ((val & 0x0000FE00) >> 9) * 8);
+ writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE,
+ gpio->base + U300_GPIO_CR);
+ u300_gpio_init_coh901571(gpio);
+
+#ifdef CONFIG_OF_GPIO
+ gpio->chip.of_node = pdev->dev.of_node;
+#endif
+ err = gpiochip_add(&gpio->chip);
+ if (err) {
+ dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
+ goto err_no_chip;
+ }
+
+ err = gpiochip_irqchip_add(&gpio->chip,
+ &u300_gpio_irqchip,
+ 0,
+ handle_simple_irq,
+ IRQ_TYPE_EDGE_FALLING);
+ if (err) {
+ dev_err(gpio->dev, "no GPIO irqchip\n");
+ goto err_no_irqchip;
+ }
+
+ /* Add each port with its IRQ separately */
+ for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) {
+ struct u300_gpio_port *port = &gpio->ports[portno];
+
+ snprintf(port->name, 8, "gpio%d", portno);
+ port->number = portno;
+ port->gpio = gpio;
+
+ port->irq = platform_get_irq(pdev, portno);
+
+ gpiochip_set_chained_irqchip(&gpio->chip,
+ &u300_gpio_irqchip,
+ port->irq,
+ u300_gpio_irq_handler);
+
+ /* Turns off irq force (test register) for this port */
+ writel(0x0, gpio->base + portno * gpio->stride + ifr);
+ }
+ dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);
+
+ /*
+ * Add pinctrl pin ranges, the pin controller must be registered
+ * at this point
+ */
+ for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) {
+ struct coh901_pinpair *p = &coh901_pintable[i];
+
+ err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300",
+ p->offset, p->pin_base, 1);
+ if (err)
+ goto err_no_range;
+ }
+
+ platform_set_drvdata(pdev, gpio);
+
+ return 0;
+
+err_no_range:
+err_no_irqchip:
+ gpiochip_remove(&gpio->chip);
+err_no_chip:
+ clk_disable_unprepare(gpio->clk);
+ dev_err(&pdev->dev, "module ERROR:%d\n", err);
+ return err;
+}
+
+static int __exit u300_gpio_remove(struct platform_device *pdev)
+{
+ struct u300_gpio *gpio = platform_get_drvdata(pdev);
+
+ /* Turn off the GPIO block */
+ writel(0x00000000U, gpio->base + U300_GPIO_CR);
+
+ gpiochip_remove(&gpio->chip);
+ clk_disable_unprepare(gpio->clk);
+ return 0;
+}
+
+static const struct of_device_id u300_gpio_match[] = {
+ { .compatible = "stericsson,gpio-coh901" },
+ {},
+};
+
+static struct platform_driver u300_gpio_driver = {
+ .driver = {
+ .name = "u300-gpio",
+ .of_match_table = u300_gpio_match,
+ },
+ .remove = __exit_p(u300_gpio_remove),
+};
+
+static int __init u300_gpio_init(void)
+{
+ return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
+}
+
+static void __exit u300_gpio_exit(void)
+{
+ platform_driver_unregister(&u300_gpio_driver);
+}
+
+arch_initcall(u300_gpio_init);
+module_exit(u300_gpio_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff