diff options
Diffstat (limited to 'drivers/gpio/gpio-mpc5200.c')
| -rw-r--r-- | drivers/gpio/gpio-mpc5200.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mpc5200.c b/drivers/gpio/gpio-mpc5200.c new file mode 100644 index 000000000000..52d3ed208105 --- /dev/null +++ b/drivers/gpio/gpio-mpc5200.c @@ -0,0 +1,376 @@ +/* + * MPC52xx gpio driver + * + * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * 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/of.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/of_gpio.h> +#include <linux/io.h> +#include <linux/of_platform.h> + +#include <asm/gpio.h> +#include <asm/mpc52xx.h> +#include <sysdev/fsl_soc.h> + +static DEFINE_SPINLOCK(gpio_lock); + +struct mpc52xx_gpiochip { + struct of_mm_gpio_chip mmchip; + unsigned int shadow_dvo; + unsigned int shadow_gpioe; + unsigned int shadow_ddr; +}; + +/* + * GPIO LIB API implementation for wakeup GPIOs. + * + * There's a maximum of 8 wakeup GPIOs. Which of these are available + * for use depends on your board setup. + * + * 0 -> GPIO_WKUP_7 + * 1 -> GPIO_WKUP_6 + * 2 -> PSC6_1 + * 3 -> PSC6_0 + * 4 -> ETH_17 + * 5 -> PSC3_9 + * 6 -> PSC2_4 + * 7 -> PSC1_4 + * + */ +static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; + unsigned int ret; + + ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; + + pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); + + return ret; +} + +static inline void +__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpiochip *chip = container_of(mm_gc, + struct mpc52xx_gpiochip, mmchip); + struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; + + if (val) + chip->shadow_dvo |= 1 << (7 - gpio); + else + chip->shadow_dvo &= ~(1 << (7 - gpio)); + + out_8(®s->wkup_dvo, chip->shadow_dvo); +} + +static void +mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + __mpc52xx_wkup_gpio_set(gc, gpio, val); + + spin_unlock_irqrestore(&gpio_lock, flags); + + pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); +} + +static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpiochip *chip = container_of(mm_gc, + struct mpc52xx_gpiochip, mmchip); + struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + /* set the direction */ + chip->shadow_ddr &= ~(1 << (7 - gpio)); + out_8(®s->wkup_ddr, chip->shadow_ddr); + + /* and enable the pin */ + chip->shadow_gpioe |= 1 << (7 - gpio); + out_8(®s->wkup_gpioe, chip->shadow_gpioe); + + spin_unlock_irqrestore(&gpio_lock, flags); + + return 0; +} + +static int +mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; + struct mpc52xx_gpiochip *chip = container_of(mm_gc, + struct mpc52xx_gpiochip, mmchip); + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + __mpc52xx_wkup_gpio_set(gc, gpio, val); + + /* Then set direction */ + chip->shadow_ddr |= 1 << (7 - gpio); + out_8(®s->wkup_ddr, chip->shadow_ddr); + + /* Finally enable the pin */ + chip->shadow_gpioe |= 1 << (7 - gpio); + out_8(®s->wkup_gpioe, chip->shadow_gpioe); + + spin_unlock_irqrestore(&gpio_lock, flags); + + pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); + + return 0; +} + +static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) +{ + struct mpc52xx_gpiochip *chip; + struct mpc52xx_gpio_wkup __iomem *regs; + struct gpio_chip *gc; + int ret; + + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + gc = &chip->mmchip.gc; + + gc->ngpio = 8; + gc->direction_input = mpc52xx_wkup_gpio_dir_in; + gc->direction_output = mpc52xx_wkup_gpio_dir_out; + gc->get = mpc52xx_wkup_gpio_get; + gc->set = mpc52xx_wkup_gpio_set; + + ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); + if (ret) + return ret; + + regs = chip->mmchip.regs; + chip->shadow_gpioe = in_8(®s->wkup_gpioe); + chip->shadow_ddr = in_8(®s->wkup_ddr); + chip->shadow_dvo = in_8(®s->wkup_dvo); + + return 0; +} + +static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) +{ + return -EBUSY; +} + +static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { + { .compatible = "fsl,mpc5200-gpio-wkup", }, + {} +}; + +static struct platform_driver mpc52xx_wkup_gpiochip_driver = { + .driver = { + .name = "mpc5200-gpio-wkup", + .owner = THIS_MODULE, + .of_match_table = mpc52xx_wkup_gpiochip_match, + }, + .probe = mpc52xx_wkup_gpiochip_probe, + .remove = mpc52xx_gpiochip_remove, +}; + +/* + * GPIO LIB API implementation for simple GPIOs + * + * There's a maximum of 32 simple GPIOs. Which of these are available + * for use depends on your board setup. + * The numbering reflects the bit numbering in the port registers: + * + * 0..1 > reserved + * 2..3 > IRDA + * 4..7 > ETHR + * 8..11 > reserved + * 12..15 > USB + * 16..17 > reserved + * 18..23 > PSC3 + * 24..27 > PSC2 + * 28..31 > PSC1 + */ +static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpio __iomem *regs = mm_gc->regs; + unsigned int ret; + + ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; + + return ret; +} + +static inline void +__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpiochip *chip = container_of(mm_gc, + struct mpc52xx_gpiochip, mmchip); + struct mpc52xx_gpio __iomem *regs = mm_gc->regs; + + if (val) + chip->shadow_dvo |= 1 << (31 - gpio); + else + chip->shadow_dvo &= ~(1 << (31 - gpio)); + out_be32(®s->simple_dvo, chip->shadow_dvo); +} + +static void +mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) +{ + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + __mpc52xx_simple_gpio_set(gc, gpio, val); + + spin_unlock_irqrestore(&gpio_lock, flags); + + pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); +} + +static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpiochip *chip = container_of(mm_gc, + struct mpc52xx_gpiochip, mmchip); + struct mpc52xx_gpio __iomem *regs = mm_gc->regs; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + /* set the direction */ + chip->shadow_ddr &= ~(1 << (31 - gpio)); + out_be32(®s->simple_ddr, chip->shadow_ddr); + + /* and enable the pin */ + chip->shadow_gpioe |= 1 << (31 - gpio); + out_be32(®s->simple_gpioe, chip->shadow_gpioe); + + spin_unlock_irqrestore(&gpio_lock, flags); + + return 0; +} + +static int +mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpiochip *chip = container_of(mm_gc, + struct mpc52xx_gpiochip, mmchip); + struct mpc52xx_gpio __iomem *regs = mm_gc->regs; + unsigned long flags; + + spin_lock_irqsave(&gpio_lock, flags); + + /* First set initial value */ + __mpc52xx_simple_gpio_set(gc, gpio, val); + + /* Then set direction */ + chip->shadow_ddr |= 1 << (31 - gpio); + out_be32(®s->simple_ddr, chip->shadow_ddr); + + /* Finally enable the pin */ + chip->shadow_gpioe |= 1 << (31 - gpio); + out_be32(®s->simple_gpioe, chip->shadow_gpioe); + + spin_unlock_irqrestore(&gpio_lock, flags); + + pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); + + return 0; +} + +static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) +{ + struct mpc52xx_gpiochip *chip; + struct gpio_chip *gc; + struct mpc52xx_gpio __iomem *regs; + int ret; + + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + gc = &chip->mmchip.gc; + + gc->ngpio = 32; + gc->direction_input = mpc52xx_simple_gpio_dir_in; + gc->direction_output = mpc52xx_simple_gpio_dir_out; + gc->get = mpc52xx_simple_gpio_get; + gc->set = mpc52xx_simple_gpio_set; + + ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); + if (ret) + return ret; + + regs = chip->mmchip.regs; + chip->shadow_gpioe = in_be32(®s->simple_gpioe); + chip->shadow_ddr = in_be32(®s->simple_ddr); + chip->shadow_dvo = in_be32(®s->simple_dvo); + + return 0; +} + +static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { + { .compatible = "fsl,mpc5200-gpio", }, + {} +}; + +static struct platform_driver mpc52xx_simple_gpiochip_driver = { + .driver = { + .name = "mpc5200-gpio", + .owner = THIS_MODULE, + .of_match_table = mpc52xx_simple_gpiochip_match, + }, + .probe = mpc52xx_simple_gpiochip_probe, + .remove = mpc52xx_gpiochip_remove, +}; + +static int __init mpc52xx_gpio_init(void) +{ + if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) + printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); + + if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) + printk(KERN_ERR "Unable to register simple GPIO driver\n"); + + return 0; +} + + +/* Make sure we get initialised before anyone else tries to use us */ +subsys_initcall(mpc52xx_gpio_init); + +/* No exit call at the moment as we cannot unregister of gpio chips */ + +MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); +MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); +MODULE_LICENSE("GPL v2"); + |