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-rw-r--r--arch/arm/mach-u300/gpio.c703
1 files changed, 703 insertions, 0 deletions
diff --git a/arch/arm/mach-u300/gpio.c b/arch/arm/mach-u300/gpio.c
new file mode 100644
index 000000000000..308cdb197a92
--- /dev/null
+++ b/arch/arm/mach-u300/gpio.c
@@ -0,0 +1,703 @@
+/*
+ *
+ * arch/arm/mach-u300/gpio.c
+ *
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * U300 GPIO module.
+ * This can driver either of the two basic GPIO cores
+ * available in the U300 platforms:
+ * COH 901 335 - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0)
+ * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
+ * Notice that you also have inline macros in <asm-arch/gpio.h>
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ * 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>
+
+/* Need access to SYSCON registers for PADmuxing */
+#include <mach/syscon.h>
+
+#include "padmux.h"
+
+/* Reference to GPIO block clock */
+static struct clk *clk;
+
+/* Memory resource */
+static struct resource *memres;
+static void __iomem *virtbase;
+static struct device *gpiodev;
+
+struct u300_gpio_port {
+ const char *name;
+ int irq;
+ int number;
+};
+
+
+static struct u300_gpio_port gpio_ports[] = {
+ {
+ .name = "gpio0",
+ .number = 0,
+ },
+ {
+ .name = "gpio1",
+ .number = 1,
+ },
+ {
+ .name = "gpio2",
+ .number = 2,
+ },
+#ifdef U300_COH901571_3
+ {
+ .name = "gpio3",
+ .number = 3,
+ },
+ {
+ .name = "gpio4",
+ .number = 4,
+ },
+#ifdef CONFIG_MACH_U300_BS335
+ {
+ .name = "gpio5",
+ .number = 5,
+ },
+ {
+ .name = "gpio6",
+ .number = 6,
+ },
+#endif
+#endif
+
+};
+
+
+#ifdef U300_COH901571_3
+
+/* Default input value */
+#define DEFAULT_OUTPUT_LOW 0
+#define DEFAULT_OUTPUT_HIGH 1
+
+/* GPIO Pull-Up status */
+#define DISABLE_PULL_UP 0
+#define ENABLE_PULL_UP 1
+
+#define GPIO_NOT_USED 0
+#define GPIO_IN 1
+#define GPIO_OUT 2
+
+struct u300_gpio_configuration_data {
+ unsigned char pin_usage;
+ unsigned char default_output_value;
+ unsigned char pull_up;
+};
+
+/* Initial configuration */
+const struct u300_gpio_configuration_data
+u300_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
+#ifdef CONFIG_MACH_U300_BS335
+ /* Port 0, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 1, pins 0-7 */
+ {
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 2, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
+ },
+ /* Port 3, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 4, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 5, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 6, pind 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ }
+#endif
+
+#ifdef CONFIG_MACH_U300_BS365
+ /* Port 0, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 1, pins 0-7 */
+ {
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_HIGH, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP}
+ },
+ /* Port 2, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, DISABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
+ },
+ /* Port 3, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
+ },
+ /* Port 4, pins 0-7 */
+ {
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_IN, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ /* These 4 pins doesn't exist on DB3210 */
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP},
+ {GPIO_OUT, DEFAULT_OUTPUT_LOW, ENABLE_PULL_UP}
+ }
+#endif
+};
+#endif
+
+
+/* No users == we can power down GPIO */
+static int gpio_users;
+
+struct gpio_struct {
+ int (*callback)(void *);
+ void *data;
+ int users;
+};
+
+static struct gpio_struct gpio_pin[U300_GPIO_MAX];
+
+/*
+ * Let drivers register callback in order to get notified when there is
+ * an interrupt on the gpio pin
+ */
+int gpio_register_callback(unsigned gpio, int (*func)(void *arg), void *data)
+{
+ if (gpio_pin[gpio].callback)
+ dev_warn(gpiodev, "%s: WARNING: callback already "
+ "registered for gpio pin#%d\n", __func__, gpio);
+ gpio_pin[gpio].callback = func;
+ gpio_pin[gpio].data = data;
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_register_callback);
+
+int gpio_unregister_callback(unsigned gpio)
+{
+ if (!gpio_pin[gpio].callback)
+ dev_warn(gpiodev, "%s: WARNING: callback already "
+ "unregistered for gpio pin#%d\n", __func__, gpio);
+ gpio_pin[gpio].callback = NULL;
+ gpio_pin[gpio].data = NULL;
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_unregister_callback);
+
+int gpio_request(unsigned gpio, const char *label)
+{
+ if (gpio_pin[gpio].users)
+ return -EINVAL;
+ else
+ gpio_pin[gpio].users++;
+
+ gpio_users++;
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_request);
+
+void gpio_free(unsigned gpio)
+{
+ gpio_users--;
+ gpio_pin[gpio].users--;
+ if (unlikely(gpio_pin[gpio].users < 0)) {
+ dev_warn(gpiodev, "warning: gpio#%d release mismatch\n",
+ gpio);
+ gpio_pin[gpio].users = 0;
+ }
+
+ return;
+}
+EXPORT_SYMBOL(gpio_free);
+
+/* This returns zero or nonzero */
+int gpio_get_value(unsigned gpio)
+{
+ return readl(virtbase + U300_GPIO_PXPDIR +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) & (1 << (gpio & 0x07));
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+/*
+ * We hope that the compiler will optimize away the unused branch
+ * in case "value" is a constant
+ */
+void gpio_set_value(unsigned gpio, int value)
+{
+ u32 val;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ if (value) {
+ /* set */
+ val = readl(virtbase + U300_GPIO_PXPDOR +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
+ & (1 << (gpio & 0x07));
+ writel(val | (1 << (gpio & 0x07)), virtbase +
+ U300_GPIO_PXPDOR +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+ } else {
+ /* clear */
+ val = readl(virtbase + U300_GPIO_PXPDOR +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
+ & (1 << (gpio & 0x07));
+ writel(val & ~(1 << (gpio & 0x07)), virtbase +
+ U300_GPIO_PXPDOR +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+ }
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+int gpio_direction_input(unsigned gpio)
+{
+ unsigned long flags;
+ u32 val;
+
+ if (gpio > U300_GPIO_MAX)
+ return -EINVAL;
+
+ local_irq_save(flags);
+ val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ /* Mask out this pin*/
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
+ /* This is not needed since it sets the bits to zero.*/
+ /* val |= (U300_GPIO_PXPCR_PIN_MODE_INPUT << (gpio*2)); */
+ writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ local_irq_restore(flags);
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+ unsigned long flags;
+ u32 val;
+
+ if (gpio > U300_GPIO_MAX)
+ return -EINVAL;
+
+ local_irq_save(flags);
+ val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ /* Mask out this pin */
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
+ /*
+ * FIXME: configure for push/pull, open drain or open source per pin
+ * in setup. The current driver will only support push/pull.
+ */
+ val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
+ << ((gpio & 0x07) << 1));
+ writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ gpio_set_value(gpio, value);
+ local_irq_restore(flags);
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+/*
+ * Enable an IRQ, edge is rising edge (!= 0) or falling edge (==0).
+ */
+void enable_irq_on_gpio_pin(unsigned gpio, int edge)
+{
+ u32 val;
+ unsigned long flags;
+ local_irq_save(flags);
+
+ val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ val |= (1 << (gpio & 0x07));
+ writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ val = readl(virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ if (edge)
+ val |= (1 << (gpio & 0x07));
+ else
+ val &= ~(1 << (gpio & 0x07));
+ writel(val, virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(enable_irq_on_gpio_pin);
+
+void disable_irq_on_gpio_pin(unsigned gpio)
+{
+ u32 val;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ val &= ~(1 << (gpio & 0x07));
+ writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(disable_irq_on_gpio_pin);
+
+/* Enable (value == 0) or disable (value == 1) internal pullup */
+void gpio_pullup(unsigned gpio, int value)
+{
+ u32 val;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ if (value) {
+ val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ writel(val | (1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+ } else {
+ val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
+ U300_GPIO_PORTX_SPACING);
+ writel(val & ~(1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
+ PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+ }
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_pullup);
+
+static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
+{
+ struct u300_gpio_port *port = dev_id;
+ u32 val;
+ int pin;
+
+ /* Read event register */
+ val = readl(virtbase + U300_GPIO_PXIEV + port->number *
+ U300_GPIO_PORTX_SPACING);
+ /* Mask with enable register */
+ val &= readl(virtbase + U300_GPIO_PXIEV + port->number *
+ U300_GPIO_PORTX_SPACING);
+ /* Mask relevant bits */
+ val &= U300_GPIO_PXIEV_ALL_IRQ_EVENT_MASK;
+ /* ACK IRQ (clear event) */
+ writel(val, virtbase + U300_GPIO_PXIEV + port->number *
+ U300_GPIO_PORTX_SPACING);
+ /* Print message */
+ while (val != 0) {
+ unsigned gpio;
+
+ pin = __ffs(val);
+ /* mask off this pin */
+ val &= ~(1 << pin);
+ gpio = (port->number << 3) + pin;
+
+ if (gpio_pin[gpio].callback)
+ (void)gpio_pin[gpio].callback(gpio_pin[gpio].data);
+ else
+ dev_dbg(gpiodev, "stray GPIO IRQ on line %d\n",
+ gpio);
+ }
+ return IRQ_HANDLED;
+}
+
+static void gpio_set_initial_values(void)
+{
+#ifdef U300_COH901571_3
+ int i, j;
+ unsigned long flags;
+ u32 val;
+
+ /* Write default values to all pins */
+ for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
+ val = 0;
+ for (j = 0; j < 8; j++)
+ val |= (u32) (u300_gpio_config[i][j].default_output_value != DEFAULT_OUTPUT_LOW) << j;
+ local_irq_save(flags);
+ writel(val, virtbase + U300_GPIO_PXPDOR + i * U300_GPIO_PORTX_SPACING);
+ local_irq_restore(flags);
+ }
+
+ /*
+ * Put all pins that are set to either 'GPIO_OUT' or 'GPIO_NOT_USED'
+ * to output and 'GPIO_IN' to input for each port. And initalize
+ * default value on outputs.
+ */
+ for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
+ for (j = 0; j < U300_GPIO_PINS_PER_PORT; j++) {
+ local_irq_save(flags);
+ val = readl(virtbase + U300_GPIO_PXPCR +
+ i * U300_GPIO_PORTX_SPACING);
+ /* Mask out this pin */
+ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << (j << 1));
+
+ if (u300_gpio_config[i][j].pin_usage != GPIO_IN)
+ val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << (j << 1));
+ writel(val, virtbase + U300_GPIO_PXPCR +
+ i * U300_GPIO_PORTX_SPACING);
+ local_irq_restore(flags);
+ }
+ }
+
+ /* Enable or disable the internal pull-ups in the GPIO ASIC block */
+ for (i = 0; i < U300_GPIO_MAX; i++) {
+ val = 0;
+ for (j = 0; j < 8; j++)
+ val |= (u32)((u300_gpio_config[i][j].pull_up == DISABLE_PULL_UP)) << j;
+ local_irq_save(flags);
+ writel(val, virtbase + U300_GPIO_PXPER + i * U300_GPIO_PORTX_SPACING);
+ local_irq_restore(flags);
+ }
+#endif
+}
+
+static int __init gpio_probe(struct platform_device *pdev)
+{
+ u32 val;
+ int err = 0;
+ int i;
+ int num_irqs;
+
+ gpiodev = &pdev->dev;
+ memset(gpio_pin, 0, sizeof(gpio_pin));
+
+ /* Get GPIO clock */
+ clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ err = PTR_ERR(clk);
+ dev_err(gpiodev, "could not get GPIO clock\n");
+ goto err_no_clk;
+ }
+ err = clk_enable(clk);
+ if (err) {
+ dev_err(gpiodev, "could not enable GPIO clock\n");
+ goto err_no_clk_enable;
+ }
+
+ memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!memres)
+ goto err_no_resource;
+
+ if (request_mem_region(memres->start, memres->end - memres->start, "GPIO Controller")
+ == NULL) {
+ err = -ENODEV;
+ goto err_no_ioregion;
+ }
+
+ virtbase = ioremap(memres->start, resource_size(memres));
+ if (!virtbase) {
+ err = -ENOMEM;
+ goto err_no_ioremap;
+ }
+ dev_info(gpiodev, "remapped 0x%08x to %p\n",
+ memres->start, virtbase);
+
+#ifdef U300_COH901335
+ dev_info(gpiodev, "initializing GPIO Controller COH 901 335\n");
+ /* Turn on the GPIO block */
+ writel(U300_GPIO_CR_BLOCK_CLOCK_ENABLE, virtbase + U300_GPIO_CR);
+#endif
+
+#ifdef U300_COH901571_3
+ dev_info(gpiodev, "initializing GPIO Controller COH 901 571/3\n");
+ val = readl(virtbase + U300_GPIO_CR);
+ dev_info(gpiodev, "COH901571/3 block version: %d, " \
+ "number of cores: %d\n",
+ ((val & 0x0000FE00) >> 9),
+ ((val & 0x000001FC) >> 2));
+ writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR);
+#endif
+
+ /* Set up some padmuxing here */
+#ifdef CONFIG_MMC
+ pmx_set_mission_mode_mmc();
+#endif
+#ifdef CONFIG_SPI_PL022
+ pmx_set_mission_mode_spi();
+#endif
+
+ gpio_set_initial_values();
+
+ for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) {
+
+ gpio_ports[num_irqs].irq =
+ platform_get_irq_byname(pdev,
+ gpio_ports[num_irqs].name);
+
+ err = request_irq(gpio_ports[num_irqs].irq,
+ gpio_irq_handler, IRQF_DISABLED,
+ gpio_ports[num_irqs].name,
+ &gpio_ports[num_irqs]);
+ if (err) {
+ dev_err(gpiodev, "cannot allocate IRQ for %s!\n",
+ gpio_ports[num_irqs].name);
+ goto err_no_irq;
+ }
+ /* Turns off PortX_irq_force */
+ writel(0x0, virtbase + U300_GPIO_PXIFR +
+ num_irqs * U300_GPIO_PORTX_SPACING);
+ }
+
+ return 0;
+
+ err_no_irq:
+ for (i = 0; i < num_irqs; i++)
+ free_irq(gpio_ports[i].irq, &gpio_ports[i]);
+ iounmap(virtbase);
+ err_no_ioremap:
+ release_mem_region(memres->start, memres->end - memres->start);
+ err_no_ioregion:
+ err_no_resource:
+ clk_disable(clk);
+ err_no_clk_enable:
+ clk_put(clk);
+ err_no_clk:
+ dev_info(gpiodev, "module ERROR:%d\n", err);
+ return err;
+}
+
+static int __exit gpio_remove(struct platform_device *pdev)
+{
+ int i;
+
+ /* Turn off the GPIO block */
+ writel(0x00000000U, virtbase + U300_GPIO_CR);
+ for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++)
+ free_irq(gpio_ports[i].irq, &gpio_ports[i]);
+ iounmap(virtbase);
+ release_mem_region(memres->start, memres->end - memres->start);
+ clk_disable(clk);
+ clk_put(clk);
+ return 0;
+}
+
+static struct platform_driver gpio_driver = {
+ .driver = {
+ .name = "u300-gpio",
+ },
+ .remove = __exit_p(gpio_remove),
+};
+
+
+static int __init u300_gpio_init(void)
+{
+ return platform_driver_probe(&gpio_driver, gpio_probe);
+}
+
+static void __exit u300_gpio_exit(void)
+{
+ platform_driver_unregister(&gpio_driver);
+}
+
+arch_initcall(u300_gpio_init);
+module_exit(u300_gpio_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+
+#ifdef U300_COH901571_3
+MODULE_DESCRIPTION("ST-Ericsson AB COH 901 571/3 GPIO driver");
+#endif
+
+#ifdef U300_COH901335
+MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335 GPIO driver");
+#endif
+
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 02:38:29 +0000