projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a3b8d4a5 AS |
1 | /* |
| 2 | * CLPS711X GPIO driver | |
| 3 | * | |
| 4 | * Copyright (C) 2012 Alexander Shiyan <shc_work@mail.ru> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License as published by | |
| 8 | * the Free Software Foundation; either version 2 of the License, or | |
| 9 | * (at your option) any later version. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/io.h> | |
| 13 | #include <linux/slab.h> | |
| 14 | #include <linux/gpio.h> | |
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/spinlock.h> | |
| 17 | #include <linux/platform_device.h> | |
| 18 | ||
| 19 | #include <mach/hardware.h> | |
| 20 | ||
| 21 | #define CLPS711X_GPIO_PORTS 5 | |
| 22 | #define CLPS711X_GPIO_NAME "gpio-clps711x" | |
| 23 | ||
| 24 | struct clps711x_gpio { | |
| 25 | struct gpio_chip chip[CLPS711X_GPIO_PORTS]; | |
| 26 | spinlock_t lock; | |
| 27 | }; | |
| 28 | ||
| 29 | static void __iomem *clps711x_ports[] = { | |
| 30 | CLPS711X_VIRT_BASE + PADR, | |
| 31 | CLPS711X_VIRT_BASE + PBDR, | |
| 32 | CLPS711X_VIRT_BASE + PCDR, | |
| 33 | CLPS711X_VIRT_BASE + PDDR, | |
| 34 | CLPS711X_VIRT_BASE + PEDR, | |
| 35 | }; | |
| 36 | ||
| 37 | static void __iomem *clps711x_pdirs[] = { | |
| 38 | CLPS711X_VIRT_BASE + PADDR, | |
| 39 | CLPS711X_VIRT_BASE + PBDDR, | |
| 40 | CLPS711X_VIRT_BASE + PCDDR, | |
| 41 | CLPS711X_VIRT_BASE + PDDDR, | |
| 42 | CLPS711X_VIRT_BASE + PEDDR, | |
| 43 | }; | |
| 44 | ||
| 45 | #define clps711x_port(x) clps711x_ports[x->base / 8] | |
| 46 | #define clps711x_pdir(x) clps711x_pdirs[x->base / 8] | |
| 47 | ||
| 48 | static int gpio_clps711x_get(struct gpio_chip *chip, unsigned offset) | |
| 49 | { | |
| 50 | return !!readb(clps711x_port(chip)) & (1 << offset); | |
| 51 | } | |
| 52 | ||
| 53 | static void gpio_clps711x_set(struct gpio_chip *chip, unsigned offset, | |
| 54 | int value) | |
| 55 | { | |
| 56 | int tmp; | |
| 57 | unsigned long flags; | |
| 58 | struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev); | |
| 59 | ||
| 60 | spin_lock_irqsave(&gpio->lock, flags); | |
| 61 | tmp = readb(clps711x_port(chip)) & ~(1 << offset); | |
| 62 | if (value) | |
| 63 | tmp |= 1 << offset; | |
| 64 | writeb(tmp, clps711x_port(chip)); | |
| 65 | spin_unlock_irqrestore(&gpio->lock, flags); | |
| 66 | } | |
| 67 | ||
| 68 | static int gpio_clps711x_direction_in(struct gpio_chip *chip, unsigned offset) | |
| 69 | { | |
| 70 | int tmp; | |
| 71 | unsigned long flags; | |
| 72 | struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev); | |
| 73 | ||
| 74 | spin_lock_irqsave(&gpio->lock, flags); | |
| 75 | tmp = readb(clps711x_pdir(chip)) & ~(1 << offset); | |
| 76 | writeb(tmp, clps711x_pdir(chip)); | |
| 77 | spin_unlock_irqrestore(&gpio->lock, flags); | |
| 78 | ||
| 79 | return 0; | |
| 80 | } | |
| 81 | ||
| 82 | static int gpio_clps711x_direction_out(struct gpio_chip *chip, unsigned offset, | |
| 83 | int value) | |
| 84 | { | |
| 85 | int tmp; | |
| 86 | unsigned long flags; | |
| 87 | struct clps711x_gpio *gpio = dev_get_drvdata(chip->dev); | |
| 88 | ||
| 89 | spin_lock_irqsave(&gpio->lock, flags); | |
| 90 | tmp = readb(clps711x_pdir(chip)) | (1 << offset); | |
| 91 | writeb(tmp, clps711x_pdir(chip)); | |
| 92 | tmp = readb(clps711x_port(chip)) & ~(1 << offset); | |
| 93 | if (value) | |
| 94 | tmp |= 1 << offset; | |
| 95 | writeb(tmp, clps711x_port(chip)); | |
| 96 | spin_unlock_irqrestore(&gpio->lock, flags); | |
| 97 | ||
| 98 | return 0; | |
| 99 | } | |
| 100 | ||
| 101 | struct clps711x_gpio_port { | |
| 102 | char *name; | |
| 103 | int nr; | |
| 104 | }; | |
| 105 | ||
| 106 | static const struct clps711x_gpio_port clps711x_gpio_ports[] __initconst = { | |
| 107 | { "PORTA", 8, }, | |
| 108 | { "PORTB", 8, }, | |
| 109 | { "PORTC", 8, }, | |
| 110 | { "PORTD", 8, }, | |
| 111 | { "PORTE", 3, }, | |
| 112 | }; | |
| 113 | ||
| 114 | static int __init gpio_clps711x_init(void) | |
| 115 | { | |
| 116 | int i; | |
| 117 | struct platform_device *pdev; | |
| 118 | struct clps711x_gpio *gpio; | |
| 119 | ||
| 120 | pdev = platform_device_alloc(CLPS711X_GPIO_NAME, 0); | |
| 121 | if (!pdev) { | |
| 122 | pr_err("Cannot create platform device: %s\n", | |
| 123 | CLPS711X_GPIO_NAME); | |
| 124 | return -ENOMEM; | |
| 125 | } | |
| 126 | ||
| 127 | platform_device_add(pdev); | |
| 128 | ||
| 129 | gpio = devm_kzalloc(&pdev->dev, sizeof(struct clps711x_gpio), | |
| 130 | GFP_KERNEL); | |
| 131 | if (!gpio) { | |
| 132 | dev_err(&pdev->dev, "GPIO allocating memory error\n"); | |
| 133 | platform_device_del(pdev); | |
| 134 | platform_device_put(pdev); | |
| 135 | return -ENOMEM; | |
| 136 | } | |
| 137 | ||
| 138 | platform_set_drvdata(pdev, gpio); | |
| 139 | ||
| 140 | spin_lock_init(&gpio->lock); | |
| 141 | ||
| 142 | for (i = 0; i < CLPS711X_GPIO_PORTS; i++) { | |
| 143 | gpio->chip[i].owner = THIS_MODULE; | |
| 144 | gpio->chip[i].dev = &pdev->dev; | |
| 145 | gpio->chip[i].label = clps711x_gpio_ports[i].name; | |
| 146 | gpio->chip[i].base = i * 8; | |
| 147 | gpio->chip[i].ngpio = clps711x_gpio_ports[i].nr; | |
| 148 | gpio->chip[i].direction_input = gpio_clps711x_direction_in; | |
| 149 | gpio->chip[i].get = gpio_clps711x_get; | |
| 150 | gpio->chip[i].direction_output = gpio_clps711x_direction_out; | |
| 151 | gpio->chip[i].set = gpio_clps711x_set; | |
| 152 | WARN_ON(gpiochip_add(&gpio->chip[i])); | |
| 153 | } | |
| 154 | ||
| 155 | dev_info(&pdev->dev, "GPIO driver initialized\n"); | |
| 156 | ||
| 157 | return 0; | |
| 158 | } | |
| 159 | arch_initcall(gpio_clps711x_init); | |
| 160 | ||
| 161 | MODULE_LICENSE("GPL v2"); | |
| 162 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); | |
| 163 | MODULE_DESCRIPTION("CLPS711X GPIO driver"); |