Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / gpio / gpio-74xx-mmio.c
blob0475e8ec96d0170ff2c6de7c543596bc773104d9
1 /*
2 * 74xx MMIO GPIO driver
4 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
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.
12 #include <linux/err.h>
13 #include <linux/module.h>
14 #include <linux/of_device.h>
15 #include <linux/gpio/driver.h>
16 #include <linux/platform_device.h>
18 #define MMIO_74XX_DIR_IN (0 << 8)
19 #define MMIO_74XX_DIR_OUT (1 << 8)
20 #define MMIO_74XX_BIT_CNT(x) ((x) & 0xff)
22 struct mmio_74xx_gpio_priv {
23 struct gpio_chip gc;
24 unsigned flags;
27 static const struct of_device_id mmio_74xx_gpio_ids[] = {
29 .compatible = "ti,741g125",
30 .data = (const void *)(MMIO_74XX_DIR_IN | 1),
33 .compatible = "ti,742g125",
34 .data = (const void *)(MMIO_74XX_DIR_IN | 2),
37 .compatible = "ti,74125",
38 .data = (const void *)(MMIO_74XX_DIR_IN | 4),
41 .compatible = "ti,74365",
42 .data = (const void *)(MMIO_74XX_DIR_IN | 6),
45 .compatible = "ti,74244",
46 .data = (const void *)(MMIO_74XX_DIR_IN | 8),
49 .compatible = "ti,741624",
50 .data = (const void *)(MMIO_74XX_DIR_IN | 16),
53 .compatible = "ti,741g74",
54 .data = (const void *)(MMIO_74XX_DIR_OUT | 1),
57 .compatible = "ti,7474",
58 .data = (const void *)(MMIO_74XX_DIR_OUT | 2),
61 .compatible = "ti,74175",
62 .data = (const void *)(MMIO_74XX_DIR_OUT | 4),
65 .compatible = "ti,74174",
66 .data = (const void *)(MMIO_74XX_DIR_OUT | 6),
69 .compatible = "ti,74273",
70 .data = (const void *)(MMIO_74XX_DIR_OUT | 8),
73 .compatible = "ti,7416374",
74 .data = (const void *)(MMIO_74XX_DIR_OUT | 16),
76 { }
78 MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);
80 static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
82 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
84 return !(priv->flags & MMIO_74XX_DIR_OUT);
87 static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
89 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
91 return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0;
94 static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
96 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
98 if (priv->flags & MMIO_74XX_DIR_OUT) {
99 gc->set(gc, gpio, val);
100 return 0;
103 return -ENOTSUPP;
106 static int mmio_74xx_gpio_probe(struct platform_device *pdev)
108 const struct of_device_id *of_id;
109 struct mmio_74xx_gpio_priv *priv;
110 struct resource *res;
111 void __iomem *dat;
112 int err;
114 of_id = of_match_device(mmio_74xx_gpio_ids, &pdev->dev);
115 if (!of_id)
116 return -ENODEV;
118 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
119 if (!priv)
120 return -ENOMEM;
122 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
123 dat = devm_ioremap_resource(&pdev->dev, res);
124 if (IS_ERR(dat))
125 return PTR_ERR(dat);
127 priv->flags = (uintptr_t) of_id->data;
129 err = bgpio_init(&priv->gc, &pdev->dev,
130 DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
131 dat, NULL, NULL, NULL, NULL, 0);
132 if (err)
133 return err;
135 priv->gc.direction_input = mmio_74xx_dir_in;
136 priv->gc.direction_output = mmio_74xx_dir_out;
137 priv->gc.get_direction = mmio_74xx_get_direction;
138 priv->gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
139 priv->gc.owner = THIS_MODULE;
141 platform_set_drvdata(pdev, priv);
143 return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
146 static struct platform_driver mmio_74xx_gpio_driver = {
147 .driver = {
148 .name = "74xx-mmio-gpio",
149 .of_match_table = mmio_74xx_gpio_ids,
151 .probe = mmio_74xx_gpio_probe,
153 module_platform_driver(mmio_74xx_gpio_driver);
155 MODULE_LICENSE("GPL");
156 MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
157 MODULE_DESCRIPTION("74xx MMIO GPIO driver");