| /* |
| * 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 <linux/module.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 = gpiochip_get_data(gc); |
| 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 = gpiochip_get_data(gc); |
| 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 = gpiochip_get_data(gc); |
| 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 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 = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| platform_set_drvdata(ofdev, chip); |
| |
| 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_data(ofdev->dev.of_node, &chip->mmchip, chip); |
| 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) |
| { |
| struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev); |
| |
| of_mm_gpiochip_remove(&chip->mmchip); |
| |
| return 0; |
| } |
| |
| 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", |
| .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 = gpiochip_get_data(gc); |
| 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 = gpiochip_get_data(gc); |
| 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 = gpiochip_get_data(gc); |
| 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 mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) |
| { |
| struct mpc52xx_gpiochip *chip; |
| struct gpio_chip *gc; |
| struct mpc52xx_gpio __iomem *regs; |
| int ret; |
| |
| chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| platform_set_drvdata(ofdev, chip); |
| |
| 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_data(ofdev->dev.of_node, &chip->mmchip, chip); |
| 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", |
| .of_match_table = mpc52xx_simple_gpiochip_match, |
| }, |
| .probe = mpc52xx_simple_gpiochip_probe, |
| .remove = mpc52xx_gpiochip_remove, |
| }; |
| |
| static struct platform_driver * const drivers[] = { |
| &mpc52xx_wkup_gpiochip_driver, |
| &mpc52xx_simple_gpiochip_driver, |
| }; |
| |
| static int __init mpc52xx_gpio_init(void) |
| { |
| return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); |
| } |
| |
| /* Make sure we get initialised before anyone else tries to use us */ |
| subsys_initcall(mpc52xx_gpio_init); |
| |
| static void __exit mpc52xx_gpio_exit(void) |
| { |
| platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); |
| } |
| module_exit(mpc52xx_gpio_exit); |
| |
| MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); |
| MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); |
| MODULE_LICENSE("GPL v2"); |
| |