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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * 74xx MMIO GPIO driver
4 *
5 * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
6 */
7
8#include <linux/bits.h>
9#include <linux/err.h>
10#include <linux/gpio/driver.h>
11#include <linux/mod_devicetable.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/property.h>
15
16#define MMIO_74XX_DIR_IN BIT(8)
17#define MMIO_74XX_DIR_OUT BIT(9)
18#define MMIO_74XX_BIT_CNT(x) ((x) & GENMASK(7, 0))
19
20struct mmio_74xx_gpio_priv {
21 struct gpio_chip gc;
22 unsigned flags;
23};
24
25static const struct of_device_id mmio_74xx_gpio_ids[] = {
26 {
27 .compatible = "ti,741g125",
28 .data = (const void *)(MMIO_74XX_DIR_IN | 1),
29 },
30 {
31 .compatible = "ti,742g125",
32 .data = (const void *)(MMIO_74XX_DIR_IN | 2),
33 },
34 {
35 .compatible = "ti,74125",
36 .data = (const void *)(MMIO_74XX_DIR_IN | 4),
37 },
38 {
39 .compatible = "ti,74365",
40 .data = (const void *)(MMIO_74XX_DIR_IN | 6),
41 },
42 {
43 .compatible = "ti,74244",
44 .data = (const void *)(MMIO_74XX_DIR_IN | 8),
45 },
46 {
47 .compatible = "ti,741624",
48 .data = (const void *)(MMIO_74XX_DIR_IN | 16),
49 },
50 {
51 .compatible = "ti,741g74",
52 .data = (const void *)(MMIO_74XX_DIR_OUT | 1),
53 },
54 {
55 .compatible = "ti,7474",
56 .data = (const void *)(MMIO_74XX_DIR_OUT | 2),
57 },
58 {
59 .compatible = "ti,74175",
60 .data = (const void *)(MMIO_74XX_DIR_OUT | 4),
61 },
62 {
63 .compatible = "ti,74174",
64 .data = (const void *)(MMIO_74XX_DIR_OUT | 6),
65 },
66 {
67 .compatible = "ti,74273",
68 .data = (const void *)(MMIO_74XX_DIR_OUT | 8),
69 },
70 {
71 .compatible = "ti,7416374",
72 .data = (const void *)(MMIO_74XX_DIR_OUT | 16),
73 },
74 { }
75};
76MODULE_DEVICE_TABLE(of, mmio_74xx_gpio_ids);
77
78static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
79{
80 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
81
82 if (priv->flags & MMIO_74XX_DIR_OUT)
83 return GPIO_LINE_DIRECTION_OUT;
84
85 return GPIO_LINE_DIRECTION_IN;
86}
87
88static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
89{
90 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
91
92 if (priv->flags & MMIO_74XX_DIR_IN)
93 return 0;
94
95 return -ENOTSUPP;
96}
97
98static int mmio_74xx_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
99{
100 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
101
102 if (priv->flags & MMIO_74XX_DIR_OUT) {
103 gc->set(gc, gpio, val);
104 return 0;
105 }
106
107 return -ENOTSUPP;
108}
109
110static int mmio_74xx_gpio_probe(struct platform_device *pdev)
111{
112 struct mmio_74xx_gpio_priv *priv;
113 void __iomem *dat;
114 int err;
115
116 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
117 if (!priv)
118 return -ENOMEM;
119
120 priv->flags = (uintptr_t)device_get_match_data(&pdev->dev);
121
122 dat = devm_platform_ioremap_resource(pdev, 0);
123 if (IS_ERR(dat))
124 return PTR_ERR(dat);
125
126 err = bgpio_init(&priv->gc, &pdev->dev,
127 DIV_ROUND_UP(MMIO_74XX_BIT_CNT(priv->flags), 8),
128 dat, NULL, NULL, NULL, NULL, 0);
129 if (err)
130 return err;
131
132 priv->gc.direction_input = mmio_74xx_dir_in;
133 priv->gc.direction_output = mmio_74xx_dir_out;
134 priv->gc.get_direction = mmio_74xx_get_direction;
135 priv->gc.ngpio = MMIO_74XX_BIT_CNT(priv->flags);
136 priv->gc.owner = THIS_MODULE;
137
138 platform_set_drvdata(pdev, priv);
139
140 return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
141}
142
143static struct platform_driver mmio_74xx_gpio_driver = {
144 .driver = {
145 .name = "74xx-mmio-gpio",
146 .of_match_table = mmio_74xx_gpio_ids,
147 },
148 .probe = mmio_74xx_gpio_probe,
149};
150module_platform_driver(mmio_74xx_gpio_driver);
151
152MODULE_LICENSE("GPL");
153MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
154MODULE_DESCRIPTION("74xx MMIO GPIO driver");
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/module.h>
14#include <linux/of_device.h>
15#include <linux/gpio/driver.h>
16#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 {
23 struct gpio_chip gc;
24 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
80static int mmio_74xx_get_direction(struct gpio_chip *gc, unsigned offset)
81{
82 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
83
84 return !(priv->flags & MMIO_74XX_DIR_OUT);
85}
86
87static int mmio_74xx_dir_in(struct gpio_chip *gc, unsigned int gpio)
88{
89 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
90
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{
96 struct mmio_74xx_gpio_priv *priv = gpiochip_get_data(gc);
97
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{
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;
113
114 of_id = of_match_device(mmio_74xx_gpio_ids, &pdev->dev);
115 if (!of_id)
116 return -ENODEV;
117
118 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
127 priv->flags = (uintptr_t) of_id->data;
128
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;
134
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;
140
141 platform_set_drvdata(pdev, priv);
142
143 return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv);
144}
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,
152};
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");