[1/4] gpio: move U300 GPIO driver to drivers/gpio

Message ID	1305929113-9046-1-git-send-email-linus.walleij@stericsson.com
State	Accepted
Commit	06caa7ad8341db2f03165fa763559475cc404584
Headers	show Return-Path: <linus.walleij@stericsson.com> Received-SPF: neutral (google.com: 207.126.144.145 is neither permitted nor denied by best guess record for domain of linus.walleij@stericsson.com) client-ip=207.126.144.145; From: Linus Walleij <linus.walleij@stericsson.com> To: Grant Likely <grant.likely@secretlab.ca>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org> Cc: Lee Jones <lee.jones@linaro.org>, Linus Walleij <linus.walleij@linaro.org> Subject: [PATCH 1/4] gpio: move U300 GPIO driver to drivers/gpio Date: Sat, 21 May 2011 00:05:13 +0200 Message-ID: <1305929113-9046-1-git-send-email-linus.walleij@stericsson.com> MIME-Version: 1.0 Content-Type: text/plain

diff --git a/arch/arm/mach-u300/Makefile b/arch/arm/mach-u300/Makefile index fab46fe..8fd354a 100644 --- a/arch/arm/mach-u300/Makefile +++ b/arch/arm/mach-u300/Makefile @@ -2,7 +2,7 @@ # Makefile for the linux kernel, U300 machine. # -obj-y := core.o clock.o timer.o gpio.o padmux.o +obj-y := core.o clock.o timer.o padmux.o obj-m := obj-n := obj- := diff --git a/arch/arm/mach-u300/gpio.c b/arch/arm/mach-u300/gpio.c deleted file mode 100644 index d927901..0000000 --- a/arch/arm/mach-u300/gpio.c +++ /dev/null @@ -1,700 +0,0 @@ -/* - * - * 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> - -/* 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); - -/* Non-zero means valid */ -int gpio_is_valid(int number) -{ - if (number >= 0 && - number < (U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT)) - return 1; - return 0; -} -EXPORT_SYMBOL(gpio_is_valid); - -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 initialize - * 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 - - 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"); diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index becef59..7245d7d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_GPIO_WM831X) += wm831x-gpio.o obj-$(CONFIG_GPIO_WM8350) += wm8350-gpiolib.o obj-$(CONFIG_GPIO_WM8994) += wm8994-gpio.o obj-$(CONFIG_GPIO_SCH) += sch_gpio.o +obj-$(CONFIG_MACH_U300) += gpio-u300.o obj-$(CONFIG_GPIO_RDC321X) += rdc321x-gpio.o obj-$(CONFIG_GPIO_JANZ_TTL) += janz-ttl.o obj-$(CONFIG_GPIO_SX150X) += sx150x.o diff --git a/drivers/gpio/gpio-u300.c b/drivers/gpio/gpio-u300.c new file mode 100644 index 0000000..d927901 --- /dev/null +++ b/drivers/gpio/gpio-u300.c @@ -0,0 +1,700 @@ +/* + * + * 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> + +/* 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); + +/* Non-zero means valid */ +int gpio_is_valid(int number) +{ + if (number >= 0 && + number < (U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT)) + return 1; + return 0; +} +EXPORT_SYMBOL(gpio_is_valid); + +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 initialize + * 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 + + 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");

[1/4] gpio: move U300 GPIO driver to drivers/gpio

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