diff options
| -rw-r--r-- | target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-gpio.c | 273 |
1 files changed, 246 insertions, 27 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-gpio.c b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-gpio.c index 45d0bf9126..5e73b22ae8 100644 --- a/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-gpio.c +++ b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-gpio.c @@ -1,62 +1,281 @@ +/* Smedia Glamo 336x/337x gpio driver + * + * (C) 2009 Lars-Peter Clausen + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ #include <linux/kernel.h> +#include <linux/init.h> #include <linux/module.h> #include <linux/spinlock.h> #include <linux/io.h> +#include <linux/platform_device.h> -#include <linux/glamo-gpio.h> +#include <linux/gpio.h> +#include <linux/mfd/glamo.h> #include "glamo-core.h" #include "glamo-regs.h" -void glamo_gpio_setpin(struct glamo_core *glamo, unsigned int pin, - unsigned int value) +#define GLAMO_NR_GPIO 21 +#define GLAMO_NR_GPIO_REGS DIV_ROUND_UP(GLAMO_NR_GPIO, 4) + +#define GLAMO_REG_GPIO(x) (((x) * 2) + GLAMO_REG_GPIO_GEN1) + +struct glamo_gpio { + struct glamo_core *glamo; + struct gpio_chip chip; + uint16_t saved_regs[GLAMO_NR_GPIO_REGS]; +}; + +#define REG_OF_GPIO(gpio) (GLAMO_REG_GPIO(gpio >> 2)) +#define NUM_OF_GPIO(gpio) (gpio & 0x3) +#define DIRECTION_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 0)) +#define OUTPUT_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 4)) +#define INPUT_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 8)) +#define FUNC_BIT(gpio) (1 << (NUM_OF_GPIO(gpio) + 12)) + + +static inline struct glamo_core *chip_to_glamo(struct gpio_chip *chip) { - unsigned int reg = REG_OF_GPIO(pin); + return container_of(chip, struct glamo_gpio, chip)->glamo; +} + +static void glamo_gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct glamo_core *glamo = chip_to_glamo(chip); + unsigned int reg = REG_OF_GPIO(offset); u_int16_t tmp; spin_lock(&glamo->lock); tmp = readw(glamo->base + reg); if (value) - tmp |= OUTPUT_BIT(pin); + tmp |= OUTPUT_BIT(offset); else - tmp &= ~OUTPUT_BIT(pin); + tmp &= ~OUTPUT_BIT(offset); writew(tmp, glamo->base + reg); spin_unlock(&glamo->lock); } -EXPORT_SYMBOL(glamo_gpio_setpin); -int glamo_gpio_getpin(struct glamo_core *glamo, unsigned int pin) +static int glamo_gpio_get(struct gpio_chip *chip, unsigned offset) { - return readw(REG_OF_GPIO(pin)) & INPUT_BIT(pin) ? 1 : 0; + struct glamo_core *glamo = chip_to_glamo(chip); + return readw(glamo->base + REG_OF_GPIO(offset)) & INPUT_BIT(offset) ? 1 : 0; } -EXPORT_SYMBOL(glamo_gpio_getpin); -void glamo_gpio_cfgpin(struct glamo_core *glamo, unsigned int pinfunc) +static int glamo_gpio_request(struct gpio_chip *chip, unsigned offset) { - unsigned int reg = REG_OF_GPIO(pinfunc); + struct glamo_core *glamo = chip_to_glamo(chip); + unsigned int reg = REG_OF_GPIO(offset); u_int16_t tmp; spin_lock(&glamo->lock); tmp = readw(glamo->base + reg); + if ((tmp & FUNC_BIT(offset)) == 0) { + tmp |= FUNC_BIT(offset); + writew(tmp, glamo->base + reg); + } + spin_unlock(&glamo->lock); - if ((pinfunc & 0x00f0) == GLAMO_GPIO_F_FUNC) { - /* pin is a function pin: clear gpio bit */ - tmp &= ~FUNC_BIT(pinfunc); - } else { - /* pin is gpio: set gpio bit */ - tmp |= FUNC_BIT(pinfunc); - - if (pinfunc & GLAMO_GPIO_F_IN) { - /* gpio input: set bit to disable output mode */ - tmp |= GPIO_OUT_BIT(pinfunc); - } else if (pinfunc & GLAMO_GPIO_F_OUT) { - /* gpio output: clear bit to enable output mode */ - tmp &= ~GPIO_OUT_BIT(pinfunc); - } + return 0; +} + +static void glamo_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + struct glamo_core *glamo = chip_to_glamo(chip); + unsigned int reg = REG_OF_GPIO(offset); + u_int16_t tmp; + + spin_lock(&glamo->lock); + tmp = readw(glamo->base + reg); + if ((tmp & FUNC_BIT(offset)) == 1) { + tmp &= ~FUNC_BIT(offset); + writew(tmp, glamo->base + reg); } + spin_unlock(&glamo->lock); +} + +static int glamo_gpio_direction_output(struct gpio_chip *chip, unsigned offset, + int value) +{ + struct glamo_core *glamo = chip_to_glamo(chip); + unsigned int reg = REG_OF_GPIO(offset); + u_int16_t tmp; + + spin_lock(&glamo->lock); + tmp = readw(glamo->base + reg); + tmp &= ~DIRECTION_BIT(offset); + + if (value) + tmp |= OUTPUT_BIT(offset); + else + tmp &= ~OUTPUT_BIT(offset); + writew(tmp, glamo->base + reg); spin_unlock(&glamo->lock); + + return 0; +} + +static int glamo_gpio_direction_input(struct gpio_chip *chip, unsigned offset) +{ + struct glamo_core *glamo = chip_to_glamo(chip); + unsigned int reg = REG_OF_GPIO(offset); + u_int16_t tmp; + + spin_lock(&glamo->lock); + tmp = readw(glamo->base + reg); + if ((tmp & DIRECTION_BIT(offset)) == 0) { + tmp |= DIRECTION_BIT(offset); + writew(tmp, glamo->base + reg); + } + spin_unlock(&glamo->lock); + + return 0; } -EXPORT_SYMBOL(glamo_gpio_cfgpin); +static const struct __devinit gpio_chip glamo_gpio_chip = { + .label = "glamo", + .request = glamo_gpio_request, + .free = glamo_gpio_free, + .direction_input = glamo_gpio_direction_input, + .get = glamo_gpio_get, + .direction_output = glamo_gpio_direction_output, + .set = glamo_gpio_set, + .base = -1, + .ngpio = GLAMO_NR_GPIO, + .can_sleep = 0, + .owner = THIS_MODULE, +}; + +static int __devinit glamo_gpio_probe(struct platform_device *pdev) +{ + struct glamo_platform_data *pdata = pdev->dev.parent->platform_data; + struct glamo_gpio *glamo_gpio; + int ret; + + glamo_gpio = kzalloc(sizeof(struct glamo_gpio), GFP_KERNEL); + if (!glamo_gpio) + return -ENOMEM; + + glamo_gpio->glamo = dev_get_drvdata(pdev->dev.parent); + glamo_gpio->chip = glamo_gpio_chip; + glamo_gpio->chip.dev = &pdev->dev; + if (pdata) + glamo_gpio->chip.base = pdata->gpio_base; + + ret = gpiochip_add(&glamo_gpio->chip); + + if (ret) { + dev_err(&pdev->dev, "Could not register gpio chip: %d\n", ret); + goto err; + } + + platform_set_drvdata(pdev, glamo_gpio); + return 0; +err: + kfree(glamo_gpio); + return ret; +} + +static int __devexit glamo_gpio_remove(struct platform_device *pdev) +{ + struct glamo_gpio *glamo_gpio = platform_get_drvdata(pdev); + int ret; + + ret = gpiochip_remove(&glamo_gpio->chip); + if (!ret) + goto done; + + platform_set_drvdata(pdev, NULL); + kfree(glamo_gpio); + +done: + return ret; +} + +#ifdef CONFIG_PM + +static int glamo_gpio_suspend(struct device *dev) +{ + struct glamo_gpio *glamo_gpio = dev_get_drvdata(dev); + struct glamo_core *glamo = glamo_gpio->glamo; + uint16_t *saved_regs = glamo_gpio->saved_regs; + int i; + + spin_lock(&glamo->lock); + for (i = 0; i < GLAMO_NR_GPIO / 4; ++i) + saved_regs[i] = readw(glamo->base + GLAMO_REG_GPIO(i)); + spin_unlock(&glamo->lock); + + return 0; +} + +static int glamo_gpio_resume(struct device *dev) +{ + struct glamo_gpio *glamo_gpio = dev_get_drvdata(dev); + struct glamo_core *glamo = glamo_gpio->glamo; + uint16_t *saved_regs = glamo_gpio->saved_regs; + int i; + + spin_lock(&glamo->lock); + for (i = 0; i < GLAMO_NR_GPIO_REGS; ++i) + writew(saved_regs[i], glamo->base + GLAMO_REG_GPIO(i)); + spin_unlock(&glamo->lock); + return 0; +} + +static const struct dev_pm_ops glamo_pm_ops = { + .suspend = glamo_gpio_suspend, + .resume = glamo_gpio_resume, + .freeze = glamo_gpio_suspend, + .thaw = glamo_gpio_resume, +}; + +#define GLAMO_GPIO_PM_OPS (&glamo_pm_ops) + +#else +#define GLAMO_GPIO_OPS NULL +#endif + +static struct platform_driver glamo_gpio_driver = { + .driver = { + .name = "glamo-gpio", + .owner = THIS_MODULE, + .pm = GLAMO_GPIO_PM_OPS, + }, + .probe = glamo_gpio_probe, + .remove = __devexit_p(glamo_gpio_remove), +}; + +static int __devinit glamo_gpio_init(void) +{ + return platform_driver_register(&glamo_gpio_driver); +} + +static void __exit glamo_gpio_exit(void) +{ + platform_driver_unregister(&glamo_gpio_driver); +} + +module_init(glamo_gpio_init); +module_exit(glamo_gpio_exit); + +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("GPIO interface for the Glamo multimedia device"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:glamo-gpio"); |