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 | ||
132 | priv->flags = (unsigned)of_id->data; | |
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"); |