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366 lines
8.9 KiB
366 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* MPC52xx gpio driver |
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* |
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* Copyright (c) 2008 Sascha Hauer <[email protected]>, Pengutronix |
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*/ |
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#include <linux/of.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/of_gpio.h> |
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#include <linux/io.h> |
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#include <linux/of_platform.h> |
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#include <linux/module.h> |
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#include <asm/mpc52xx.h> |
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#include <sysdev/fsl_soc.h> |
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static DEFINE_SPINLOCK(gpio_lock); |
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struct mpc52xx_gpiochip { |
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struct of_mm_gpio_chip mmchip; |
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unsigned int shadow_dvo; |
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unsigned int shadow_gpioe; |
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unsigned int shadow_ddr; |
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}; |
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/* |
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* GPIO LIB API implementation for wakeup GPIOs. |
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* |
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* There's a maximum of 8 wakeup GPIOs. Which of these are available |
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* for use depends on your board setup. |
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* |
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* 0 -> GPIO_WKUP_7 |
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* 1 -> GPIO_WKUP_6 |
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* 2 -> PSC6_1 |
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* 3 -> PSC6_0 |
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* 4 -> ETH_17 |
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* 5 -> PSC3_9 |
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* 6 -> PSC2_4 |
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* 7 -> PSC1_4 |
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* |
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*/ |
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static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
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unsigned int ret; |
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ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; |
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pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); |
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return ret; |
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} |
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static inline void |
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__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); |
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struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
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if (val) |
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chip->shadow_dvo |= 1 << (7 - gpio); |
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else |
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chip->shadow_dvo &= ~(1 << (7 - gpio)); |
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out_8(®s->wkup_dvo, chip->shadow_dvo); |
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} |
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static void |
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mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_lock, flags); |
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__mpc52xx_wkup_gpio_set(gc, gpio, val); |
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spin_unlock_irqrestore(&gpio_lock, flags); |
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pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
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} |
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static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); |
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struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_lock, flags); |
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/* set the direction */ |
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chip->shadow_ddr &= ~(1 << (7 - gpio)); |
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out_8(®s->wkup_ddr, chip->shadow_ddr); |
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/* and enable the pin */ |
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chip->shadow_gpioe |= 1 << (7 - gpio); |
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out_8(®s->wkup_gpioe, chip->shadow_gpioe); |
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spin_unlock_irqrestore(&gpio_lock, flags); |
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return 0; |
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} |
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static int |
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mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
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struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_lock, flags); |
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__mpc52xx_wkup_gpio_set(gc, gpio, val); |
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/* Then set direction */ |
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chip->shadow_ddr |= 1 << (7 - gpio); |
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out_8(®s->wkup_ddr, chip->shadow_ddr); |
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/* Finally enable the pin */ |
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chip->shadow_gpioe |= 1 << (7 - gpio); |
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out_8(®s->wkup_gpioe, chip->shadow_gpioe); |
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spin_unlock_irqrestore(&gpio_lock, flags); |
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pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
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return 0; |
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} |
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static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) |
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{ |
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struct mpc52xx_gpiochip *chip; |
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struct mpc52xx_gpio_wkup __iomem *regs; |
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struct gpio_chip *gc; |
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int ret; |
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chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); |
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if (!chip) |
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return -ENOMEM; |
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platform_set_drvdata(ofdev, chip); |
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gc = &chip->mmchip.gc; |
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gc->ngpio = 8; |
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gc->direction_input = mpc52xx_wkup_gpio_dir_in; |
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gc->direction_output = mpc52xx_wkup_gpio_dir_out; |
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gc->get = mpc52xx_wkup_gpio_get; |
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gc->set = mpc52xx_wkup_gpio_set; |
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ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); |
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if (ret) |
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return ret; |
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regs = chip->mmchip.regs; |
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chip->shadow_gpioe = in_8(®s->wkup_gpioe); |
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chip->shadow_ddr = in_8(®s->wkup_ddr); |
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chip->shadow_dvo = in_8(®s->wkup_dvo); |
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return 0; |
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} |
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static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) |
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{ |
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struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev); |
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of_mm_gpiochip_remove(&chip->mmchip); |
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return 0; |
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} |
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static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { |
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{ .compatible = "fsl,mpc5200-gpio-wkup", }, |
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{} |
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}; |
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static struct platform_driver mpc52xx_wkup_gpiochip_driver = { |
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.driver = { |
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.name = "mpc5200-gpio-wkup", |
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.of_match_table = mpc52xx_wkup_gpiochip_match, |
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}, |
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.probe = mpc52xx_wkup_gpiochip_probe, |
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.remove = mpc52xx_gpiochip_remove, |
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}; |
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/* |
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* GPIO LIB API implementation for simple GPIOs |
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* |
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* There's a maximum of 32 simple GPIOs. Which of these are available |
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* for use depends on your board setup. |
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* The numbering reflects the bit numbering in the port registers: |
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* |
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* 0..1 > reserved |
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* 2..3 > IRDA |
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* 4..7 > ETHR |
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* 8..11 > reserved |
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* 12..15 > USB |
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* 16..17 > reserved |
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* 18..23 > PSC3 |
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* 24..27 > PSC2 |
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* 28..31 > PSC1 |
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*/ |
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static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
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unsigned int ret; |
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ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; |
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return ret; |
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} |
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static inline void |
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__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); |
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struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
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if (val) |
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chip->shadow_dvo |= 1 << (31 - gpio); |
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else |
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chip->shadow_dvo &= ~(1 << (31 - gpio)); |
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out_be32(®s->simple_dvo, chip->shadow_dvo); |
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} |
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static void |
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mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_lock, flags); |
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__mpc52xx_simple_gpio_set(gc, gpio, val); |
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spin_unlock_irqrestore(&gpio_lock, flags); |
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pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
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} |
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static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); |
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struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_lock, flags); |
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/* set the direction */ |
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chip->shadow_ddr &= ~(1 << (31 - gpio)); |
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out_be32(®s->simple_ddr, chip->shadow_ddr); |
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/* and enable the pin */ |
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chip->shadow_gpioe |= 1 << (31 - gpio); |
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out_be32(®s->simple_gpioe, chip->shadow_gpioe); |
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spin_unlock_irqrestore(&gpio_lock, flags); |
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return 0; |
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} |
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static int |
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mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) |
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{ |
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struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
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struct mpc52xx_gpiochip *chip = gpiochip_get_data(gc); |
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struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_lock, flags); |
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/* First set initial value */ |
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__mpc52xx_simple_gpio_set(gc, gpio, val); |
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/* Then set direction */ |
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chip->shadow_ddr |= 1 << (31 - gpio); |
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out_be32(®s->simple_ddr, chip->shadow_ddr); |
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/* Finally enable the pin */ |
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chip->shadow_gpioe |= 1 << (31 - gpio); |
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out_be32(®s->simple_gpioe, chip->shadow_gpioe); |
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spin_unlock_irqrestore(&gpio_lock, flags); |
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pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); |
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return 0; |
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} |
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static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) |
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{ |
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struct mpc52xx_gpiochip *chip; |
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struct gpio_chip *gc; |
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struct mpc52xx_gpio __iomem *regs; |
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int ret; |
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chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL); |
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if (!chip) |
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return -ENOMEM; |
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platform_set_drvdata(ofdev, chip); |
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gc = &chip->mmchip.gc; |
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gc->ngpio = 32; |
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gc->direction_input = mpc52xx_simple_gpio_dir_in; |
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gc->direction_output = mpc52xx_simple_gpio_dir_out; |
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gc->get = mpc52xx_simple_gpio_get; |
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gc->set = mpc52xx_simple_gpio_set; |
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ret = of_mm_gpiochip_add_data(ofdev->dev.of_node, &chip->mmchip, chip); |
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if (ret) |
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return ret; |
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regs = chip->mmchip.regs; |
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chip->shadow_gpioe = in_be32(®s->simple_gpioe); |
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chip->shadow_ddr = in_be32(®s->simple_ddr); |
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chip->shadow_dvo = in_be32(®s->simple_dvo); |
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return 0; |
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} |
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static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { |
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{ .compatible = "fsl,mpc5200-gpio", }, |
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{} |
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}; |
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static struct platform_driver mpc52xx_simple_gpiochip_driver = { |
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.driver = { |
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.name = "mpc5200-gpio", |
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.of_match_table = mpc52xx_simple_gpiochip_match, |
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}, |
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.probe = mpc52xx_simple_gpiochip_probe, |
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.remove = mpc52xx_gpiochip_remove, |
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}; |
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static struct platform_driver * const drivers[] = { |
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&mpc52xx_wkup_gpiochip_driver, |
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&mpc52xx_simple_gpiochip_driver, |
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}; |
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static int __init mpc52xx_gpio_init(void) |
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{ |
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return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); |
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} |
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/* Make sure we get initialised before anyone else tries to use us */ |
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subsys_initcall(mpc52xx_gpio_init); |
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static void __exit mpc52xx_gpio_exit(void) |
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{ |
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platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); |
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} |
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module_exit(mpc52xx_gpio_exit); |
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MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); |
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MODULE_AUTHOR("Sascha Hauer <[email protected]"); |
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MODULE_LICENSE("GPL v2"); |
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