projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| af0a33e2 AS |
1 | /* |
| 2 | * 74xx MMIO GPIO driver | |
| 3 | * | |
| 4 | * Copyright (C) 2014 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/err.h> | |
| 13 | #include <linux/gpio.h> | |
| 14 | #include <linux/module.h> | |
| 15 | #include <linux/of_device.h> | |
| 16 | #include <linux/basic_mmio_gpio.h> | |
| 17 | #include <linux/platform_device.h> | |
| 18 | ||
| 19 | #define MMIO_74XX_DIR_IN (0 << 8) | |
| 20 | #define MMIO_74XX_DIR_OUT (1 << 8) | |
| 21 | #define MMIO_74XX_BIT_CNT(x) ((x) & 0xff) | |
| 22 | ||
| 23 | struct mmio_74xx_gpio_priv { | |
| 24 | struct bgpio_chip bgc; | |
| 25 | unsigned flags; | |
| 26 | }; | |
| 27 | ||
| 28 | static const struct of_device_id mmio_74xx_gpio_ids[] = { | |
| 29 | { | |
| 30 | .compatible = "ti,741g125", | |
| 31 | .data = (const void *)(MMIO_74XX_DIR_IN | 1), | |
| 32 | }, | |
| 33 | { | |
| 34 | .compatible = "ti,742g125", | |
| 35 | .data = (const void *)(MMIO_74XX_DIR_IN | 2), | |
| 36 | }, | |
| 37 | { | |
| 38 | .compatible = "ti,74125", | |
| 39 | .data = (const void *)(MMIO_74XX_DIR_IN | 4), | |
| 40 | }, | |
| 41 | { | |
| 42 | .compatible = "ti,74365", | |
| 43 | .data = (const void *)(MMIO_74XX_DIR_IN | 6), | |
| 44 | }, | |
| 45 | { | |
| 46 | .compatible = "ti,74244", | |
| 47 | .data = (const void *)(MMIO_74XX_DIR_IN | 8), | |
| 48 | }, | |
| 49 | { | |
| 50 | .compatible = "ti,741624", | |
| 51 | .data = (const void *)(MMIO_74XX_DIR_IN | 16), | |
| 52 | }, | |
| 53 | { | |
| 54 | .compatible = "ti,741g74", | |
| 55 | .data = (const void *)(MMIO_74XX_DIR_OUT | 1), | |
| 56 | }, | |
| 57 | { | |
| 58 | .compatible = "ti,7474", | |
| 59 | .data = (const void *)(MMIO_74XX_DIR_OUT | 2), | |
| 60 | }, | |
| 61 | { | |
| 62 | .compatible = "ti,74175", | |
| 63 | .data = (const void *)(MMIO_74XX_DIR_OUT | 4), | |
| 64 | }, | |
| 65 | { | |
| 66 | .compatible = "ti,74174", | |
| 67 | .data = (const void *)(MMIO_74XX_DIR_OUT | 6), | |
| 68 | }, | |
| 69 | { | |
| 70 | .compatible = "ti,74273", | |
| 71 | .data = (const void *)(MMIO_74XX_DIR_OUT | 8), | |
| 72 | }, | |
| 73 | { | |
| 74 | .compatible = "ti,7416374", | |
| 75 | .data = (const void *)(MMIO_74XX_DIR_OUT | 16), | |
| 76 | }, | |
| 77 | { } | |
| 78 | }; | |
| 79 | MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids); | |
| 80 | ||
| 81 | static inline struct mmio_74xx_gpio_priv *to_74xx_gpio(struct gpio_chip *gc) | |
| 82 | { | |
| 83 | struct bgpio_chip *bgc = to_bgpio_chip(gc); | |
| 84 | ||
| 85 | return container_of(bgc, struct mmio_74xx_gpio_priv, bgc); | |
| 86 | } | |
| 87 | ||
| 88 | static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset) | |
| 89 | { | |
| 90 | struct mmio_74xx_gpio_priv *priv = to_74xx_gpio(gc); | |
| 91 | ||
| 92 | return (priv->flags & MMIO_74XX_DIR_OUT) ? GPIOF_DIR_OUT : GPIOF_DIR_IN; | |
| 93 | } | |
| 94 | ||
| 95 | static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio) | |
| 96 | { | |
| 97 | struct mmio_74xx_gpio_priv *priv = to_74xx_gpio(gc); | |
| 98 | ||
| 99 | return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0; | |
| 100 | } | |
| 101 | ||
| 102 | static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | |
| 103 | { | |
| 104 | struct mmio_74xx_gpio_priv *priv = to_74xx_gpio(gc); | |
| 105 | ||
| 106 | if (priv->flags & MMIO_74XX_DIR_OUT) { | |
| 107 | gc->set(gc, gpio, val); | |
| 108 | return 0; | |
| 109 | } | |
| 110 | ||
| 111 | return -ENOTSUPP; | |
| 112 | } | |
| 113 | ||
| 114 | static int mmio_74xx_gpio_probe(struct platform_device *pdev) | |
| 115 | { | |
| 116 | const struct of_device_id *of_id = | |
| 117 | of_match_device(mmio_74xx_gpio_ids, &pdev->dev); | |
| 118 | struct mmio_74xx_gpio_priv *priv; | |
| 119 | struct resource *res; | |
| 120 | void __iomem *dat; | |
| 121 | int err; | |
| 122 | ||
| 123 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); | |
| 124 | if (!priv) | |
| 125 | return -ENOMEM; | |
| 126 | ||
| 127 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 128 | dat = devm_ioremap_resource(&pdev->dev, res); | |
| 129 | if (IS_ERR(dat)) | |
| 130 | return PTR_ERR(dat); | |
| 131 | ||
| 54442658 | 132 | priv->flags = (uintptr_t) of_id->data; |
| af0a33e2 AS |
133 | |
| 134 | err = bgpio_init(&priv->bgc, &pdev->dev, | |
| 135 | DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8), | |
| 136 | dat, NULL, NULL, NULL, NULL, 0); | |
| 137 | if (err) | |
| 138 | return err; | |
| 139 | ||
| 140 | priv->bgc.gc.direction_input = mmio_74xx_dir_in; | |
| 141 | priv->bgc.gc.direction_output = mmio_74xx_dir_out; | |
| 142 | priv->bgc.gc.get_direction = mmio_74xx_get_direction; | |
| 143 | priv->bgc.gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags); | |
| 144 | priv->bgc.gc.owner = THIS_MODULE; | |
| 145 | ||
| 146 | platform_set_drvdata(pdev, priv); | |
| 147 | ||
| 148 | return gpiochip_add(&priv->bgc.gc); | |
| 149 | } | |
| 150 | ||
| 151 | static int mmio_74xx_gpio_remove(struct platform_device *pdev) | |
| 152 | { | |
| 153 | struct mmio_74xx_gpio_priv *priv = platform_get_drvdata(pdev); | |
| 154 | ||
| 155 | return bgpio_remove(&priv->bgc); | |
| 156 | } | |
| 157 | ||
| 158 | static struct platform_driver mmio_74xx_gpio_driver = { | |
| 159 | .driver = { | |
| 160 | .name = "74xx-mmio-gpio", | |
| 161 | .of_match_table = mmio_74xx_gpio_ids, | |
| 162 | }, | |
| 163 | .probe = mmio_74xx_gpio_probe, | |
| 164 | .remove = mmio_74xx_gpio_remove, | |
| 165 | }; | |
| 166 | module_platform_driver(mmio_74xx_gpio_driver); | |
| 167 | ||
| 168 | MODULE_LICENSE("GPL"); | |
| 169 | MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>"); | |
| 170 | MODULE_DESCRIPTION("74xx MMIO GPIO driver"); |