diff options
Diffstat (limited to 'arch/powerpc/platforms/52xx/mpc52xx_gpio.c')
| -rw-r--r-- | arch/powerpc/platforms/52xx/mpc52xx_gpio.c | 465 |
1 files changed, 465 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpio.c b/arch/powerpc/platforms/52xx/mpc52xx_gpio.c new file mode 100644 index 000000000000..48da5dfe4856 --- /dev/null +++ b/arch/powerpc/platforms/52xx/mpc52xx_gpio.c @@ -0,0 +1,465 @@ +/* + * 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/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 *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 *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 of_device *ofdev, + const struct of_device_id *match) +{ + struct mpc52xx_gpiochip *chip; + struct mpc52xx_gpio_wkup *regs; + struct of_gpio_chip *ofchip; + int ret; + + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + ofchip = &chip->mmchip.of_gc; + + ofchip->gpio_cells = 2; + ofchip->gc.ngpio = 8; + ofchip->gc.direction_input = mpc52xx_wkup_gpio_dir_in; + ofchip->gc.direction_output = mpc52xx_wkup_gpio_dir_out; + ofchip->gc.get = mpc52xx_wkup_gpio_get; + ofchip->gc.set = mpc52xx_wkup_gpio_set; + + ret = of_mm_gpiochip_add(ofdev->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 of_device *ofdev) +{ + return -EBUSY; +} + +static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { + { + .compatible = "fsl,mpc5200-gpio-wkup", + }, + {} +}; + +static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = { + .name = "gpio_wkup", + .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 *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 *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 of_device *ofdev, + const struct of_device_id *match) +{ + struct mpc52xx_gpiochip *chip; + struct of_gpio_chip *ofchip; + struct mpc52xx_gpio *regs; + int ret; + + chip = kzalloc(sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + ofchip = &chip->mmchip.of_gc; + + ofchip->gpio_cells = 2; + ofchip->gc.ngpio = 32; + ofchip->gc.direction_input = mpc52xx_simple_gpio_dir_in; + ofchip->gc.direction_output = mpc52xx_simple_gpio_dir_out; + ofchip->gc.get = mpc52xx_simple_gpio_get; + ofchip->gc.set = mpc52xx_simple_gpio_set; + + ret = of_mm_gpiochip_add(ofdev->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 of_platform_driver mpc52xx_simple_gpiochip_driver = { + .name = "gpio", + .match_table = mpc52xx_simple_gpiochip_match, + .probe = mpc52xx_simple_gpiochip_probe, + .remove = mpc52xx_gpiochip_remove, +}; + +/* + * GPIO LIB API implementation for gpt GPIOs. + * + * Each gpt only has a single GPIO. + */ +static int mpc52xx_gpt_gpio_get(struct gpio_chip *gc, unsigned int gpio) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct mpc52xx_gpt __iomem *regs = mm_gc->regs; + unsigned int ret; + + return (in_be32(®s->status) & (1 << (31 - 23))) ? 1 : 0; + + return ret; +} + +static void +mpc52xx_gpt_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_gpt __iomem *regs = mm_gc->regs; + + if (val) + out_be32(®s->mode, 0x34); + else + out_be32(®s->mode, 0x24); + + pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); +} + +static int mpc52xx_gpt_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_gpt *regs = mm_gc->regs; + + out_be32(®s->mode, 0x04); + + return 0; +} + +static int +mpc52xx_gpt_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) +{ + mpc52xx_gpt_gpio_set(gc, gpio, val); + pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); + + return 0; +} + +static int __devinit mpc52xx_gpt_gpiochip_probe(struct of_device *ofdev, + const struct of_device_id *match) +{ + struct of_mm_gpio_chip *mmchip; + struct of_gpio_chip *chip; + + mmchip = kzalloc(sizeof(*mmchip), GFP_KERNEL); + if (!mmchip) + return -ENOMEM; + + chip = &mmchip->of_gc; + + chip->gpio_cells = 2; + chip->gc.ngpio = 1; + chip->gc.direction_input = mpc52xx_gpt_gpio_dir_in; + chip->gc.direction_output = mpc52xx_gpt_gpio_dir_out; + chip->gc.get = mpc52xx_gpt_gpio_get; + chip->gc.set = mpc52xx_gpt_gpio_set; + + return of_mm_gpiochip_add(ofdev->node, mmchip); +} + +static const struct of_device_id mpc52xx_gpt_gpiochip_match[] = { + { + .compatible = "fsl,mpc5200-gpt-gpio", + }, + {} +}; + +static struct of_platform_driver mpc52xx_gpt_gpiochip_driver = { + .name = "gpio_gpt", + .match_table = mpc52xx_gpt_gpiochip_match, + .probe = mpc52xx_gpt_gpiochip_probe, + .remove = mpc52xx_gpiochip_remove, +}; + +static int __init mpc52xx_gpio_init(void) +{ + if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver)) + printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); + + if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver)) + printk(KERN_ERR "Unable to register simple GPIO driver\n"); + + if (of_register_platform_driver(&mpc52xx_gpt_gpiochip_driver)) + printk(KERN_ERR "Unable to register gpt 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"); + |