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Alexander Shiyanaf0a33e2014-10-03 11:31:57 +04001/*
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>
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040013#include <linux/module.h>
14#include <linux/of_device.h>
Linus Walleij0f4630f2015-12-04 14:02:58 +010015#include <linux/gpio/driver.h>
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040016#include <linux/platform_device.h>
17
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)
21
22struct mmio_74xx_gpio_priv {
Linus Walleij0f4630f2015-12-04 14:02:58 +010023 struct gpio_chip gc;
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040024 unsigned flags;
25};
26
27static const struct of_device_id mmio_74xx_gpio_ids[] = {
28 {
29 .compatible = "ti,741g125",
30 .data = (const void *)(MMIO_74XX_DIR_IN | 1),
31 },
32 {
33 .compatible = "ti,742g125",
34 .data = (const void *)(MMIO_74XX_DIR_IN | 2),
35 },
36 {
37 .compatible = "ti,74125",
38 .data = (const void *)(MMIO_74XX_DIR_IN | 4),
39 },
40 {
41 .compatible = "ti,74365",
42 .data = (const void *)(MMIO_74XX_DIR_IN | 6),
43 },
44 {
45 .compatible = "ti,74244",
46 .data = (const void *)(MMIO_74XX_DIR_IN | 8),
47 },
48 {
49 .compatible = "ti,741624",
50 .data = (const void *)(MMIO_74XX_DIR_IN | 16),
51 },
52 {
53 .compatible = "ti,741g74",
54 .data = (const void *)(MMIO_74XX_DIR_OUT | 1),
55 },
56 {
57 .compatible = "ti,7474",
58 .data = (const void *)(MMIO_74XX_DIR_OUT | 2),
59 },
60 {
61 .compatible = "ti,74175",
62 .data = (const void *)(MMIO_74XX_DIR_OUT | 4),
63 },
64 {
65 .compatible = "ti,74174",
66 .data = (const void *)(MMIO_74XX_DIR_OUT | 6),
67 },
68 {
69 .compatible = "ti,74273",
70 .data = (const void *)(MMIO_74XX_DIR_OUT | 8),
71 },
72 {
73 .compatible = "ti,7416374",
74 .data = (const void *)(MMIO_74XX_DIR_OUT | 16),
75 },
76 { }
77};
78MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);
79
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040080static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
81{
Linus Walleij0f4630f2015-12-04 14:02:58 +010082 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040083
Linus Walleij0f4630f2015-12-04 14:02:58 +010084 return !(priv->flags & MMIO_74XX_DIR_OUT);
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040085}
86
87static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
88{
Linus Walleij0f4630f2015-12-04 14:02:58 +010089 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040090
91 return (priv->flags & MMIO_74XX_DIR_OUT) ? -ENOTSUPP : 0;
92}
93
94static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
95{
Linus Walleij0f4630f2015-12-04 14:02:58 +010096 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +040097
98 if (priv->flags & MMIO_74XX_DIR_OUT) {
99 gc->set(gc, gpio, val);
100 return 0;
101 }
102
103 return -ENOTSUPP;
104}
105
106static int mmio_74xx_gpio_probe(struct platform_device *pdev)
107{
LABBE Corentin56880a22015-11-11 21:27:34 +0100108 const struct of_device_id *of_id;
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400109 struct mmio_74xx_gpio_priv *priv;
110 struct resource *res;
111 void __iomem *dat;
112 int err;
113
LABBE Corentin56880a22015-11-11 21:27:34 +0100114 of_id = of_match_device(mmio_74xx_gpio_ids, &pdev->dev);
115 if (!of_id)
116 return -ENODEV;
117
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400118 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
119 if (!priv)
120 return -ENOMEM;
121
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);
126
Nicholas Krause54442652015-07-04 16:34:32 -0400127 priv->flags = (uintptr_t) of_id->data;
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400128
Linus Walleij0f4630f2015-12-04 14:02:58 +0100129 err = bgpio_init(&priv->gc, &pdev->dev,
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400130 DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
131 dat, NULL, NULL, NULL, NULL, 0);
132 if (err)
133 return err;
134
Linus Walleij0f4630f2015-12-04 14:02:58 +0100135 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;
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400140
141 platform_set_drvdata(pdev, priv);
142
Laxman Dewangana718ed22016-02-22 17:43:28 +0530143 return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400144}
145
146static struct platform_driver mmio_74xx_gpio_driver = {
147 .driver = {
148 .name = "74xx-mmio-gpio",
149 .of_match_table = mmio_74xx_gpio_ids,
150 },
151 .probe = mmio_74xx_gpio_probe,
Alexander Shiyanaf0a33e2014-10-03 11:31:57 +0400152};
153module_platform_driver(mmio_74xx_gpio_driver);
154
155MODULE_LICENSE("GPL");
156MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
157MODULE_DESCRIPTION("74xx MMIO GPIO driver");