Commit | Line | Data |
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b3c185a7 PM |
1 | /* |
2 | * SuperH Pin Function Controller GPIO driver. | |
3 | * | |
4 | * Copyright (C) 2008 Magnus Damm | |
5 | * Copyright (C) 2009 - 2012 Paul Mundt | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General Public | |
8 | * License. See the file "COPYING" in the main directory of this archive | |
9 | * for more details. | |
10 | */ | |
a2d3afff | 11 | #define pr_fmt(fmt) "sh_pfc " KBUILD_MODNAME ": " fmt |
b3c185a7 PM |
12 | |
13 | #include <linux/init.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
ca5481c6 | 19 | #include <linux/pinctrl/consumer.h> |
66791859 | 20 | #include <linux/sh_pfc.h> |
b3c185a7 PM |
21 | |
22 | struct sh_pfc_chip { | |
23 | struct sh_pfc *pfc; | |
24 | struct gpio_chip gpio_chip; | |
25 | }; | |
26 | ||
27 | static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc) | |
28 | { | |
29 | return container_of(gc, struct sh_pfc_chip, gpio_chip); | |
30 | } | |
31 | ||
32 | static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc) | |
33 | { | |
34 | return gpio_to_pfc_chip(gc)->pfc; | |
35 | } | |
36 | ||
37 | static int sh_gpio_request(struct gpio_chip *gc, unsigned offset) | |
38 | { | |
ca5481c6 | 39 | return pinctrl_request_gpio(offset); |
b3c185a7 PM |
40 | } |
41 | ||
42 | static void sh_gpio_free(struct gpio_chip *gc, unsigned offset) | |
43 | { | |
ca5481c6 | 44 | pinctrl_free_gpio(offset); |
b3c185a7 PM |
45 | } |
46 | ||
47 | static void sh_gpio_set_value(struct sh_pfc *pfc, unsigned gpio, int value) | |
48 | { | |
49 | struct pinmux_data_reg *dr = NULL; | |
50 | int bit = 0; | |
51 | ||
52 | if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0) | |
53 | BUG(); | |
54 | else | |
55 | sh_pfc_write_bit(dr, bit, value); | |
56 | } | |
57 | ||
b3c185a7 PM |
58 | static int sh_gpio_get_value(struct sh_pfc *pfc, unsigned gpio) |
59 | { | |
60 | struct pinmux_data_reg *dr = NULL; | |
61 | int bit = 0; | |
62 | ||
63 | if (!pfc || sh_pfc_get_data_reg(pfc, gpio, &dr, &bit) != 0) | |
64 | return -EINVAL; | |
65 | ||
66 | return sh_pfc_read_bit(dr, bit); | |
67 | } | |
68 | ||
ca5481c6 PM |
69 | static int sh_gpio_direction_input(struct gpio_chip *gc, unsigned offset) |
70 | { | |
71 | return pinctrl_gpio_direction_input(offset); | |
72 | } | |
73 | ||
74 | static int sh_gpio_direction_output(struct gpio_chip *gc, unsigned offset, | |
75 | int value) | |
76 | { | |
77 | sh_gpio_set_value(gpio_to_pfc(gc), offset, value); | |
78 | ||
79 | return pinctrl_gpio_direction_output(offset); | |
80 | } | |
81 | ||
b3c185a7 PM |
82 | static int sh_gpio_get(struct gpio_chip *gc, unsigned offset) |
83 | { | |
84 | return sh_gpio_get_value(gpio_to_pfc(gc), offset); | |
85 | } | |
86 | ||
87 | static void sh_gpio_set(struct gpio_chip *gc, unsigned offset, int value) | |
88 | { | |
89 | sh_gpio_set_value(gpio_to_pfc(gc), offset, value); | |
90 | } | |
91 | ||
92 | static int sh_gpio_to_irq(struct gpio_chip *gc, unsigned offset) | |
93 | { | |
94 | struct sh_pfc *pfc = gpio_to_pfc(gc); | |
95 | pinmux_enum_t enum_id; | |
96 | pinmux_enum_t *enum_ids; | |
97 | int i, k, pos; | |
98 | ||
99 | pos = 0; | |
100 | enum_id = 0; | |
101 | while (1) { | |
102 | pos = sh_pfc_gpio_to_enum(pfc, offset, pos, &enum_id); | |
103 | if (pos <= 0 || !enum_id) | |
104 | break; | |
105 | ||
106 | for (i = 0; i < pfc->gpio_irq_size; i++) { | |
107 | enum_ids = pfc->gpio_irq[i].enum_ids; | |
108 | for (k = 0; enum_ids[k]; k++) { | |
109 | if (enum_ids[k] == enum_id) | |
110 | return pfc->gpio_irq[i].irq; | |
111 | } | |
112 | } | |
113 | } | |
114 | ||
115 | return -ENOSYS; | |
116 | } | |
117 | ||
118 | static void sh_pfc_gpio_setup(struct sh_pfc_chip *chip) | |
119 | { | |
120 | struct sh_pfc *pfc = chip->pfc; | |
121 | struct gpio_chip *gc = &chip->gpio_chip; | |
122 | ||
123 | gc->request = sh_gpio_request; | |
124 | gc->free = sh_gpio_free; | |
125 | gc->direction_input = sh_gpio_direction_input; | |
126 | gc->get = sh_gpio_get; | |
127 | gc->direction_output = sh_gpio_direction_output; | |
128 | gc->set = sh_gpio_set; | |
129 | gc->to_irq = sh_gpio_to_irq; | |
130 | ||
131 | WARN_ON(pfc->first_gpio != 0); /* needs testing */ | |
132 | ||
133 | gc->label = pfc->name; | |
134 | gc->owner = THIS_MODULE; | |
135 | gc->base = pfc->first_gpio; | |
136 | gc->ngpio = (pfc->last_gpio - pfc->first_gpio) + 1; | |
137 | } | |
138 | ||
139 | int sh_pfc_register_gpiochip(struct sh_pfc *pfc) | |
140 | { | |
141 | struct sh_pfc_chip *chip; | |
142 | int ret; | |
143 | ||
144 | chip = kzalloc(sizeof(struct sh_pfc_chip), GFP_KERNEL); | |
145 | if (unlikely(!chip)) | |
146 | return -ENOMEM; | |
147 | ||
148 | chip->pfc = pfc; | |
149 | ||
150 | sh_pfc_gpio_setup(chip); | |
151 | ||
152 | ret = gpiochip_add(&chip->gpio_chip); | |
153 | if (unlikely(ret < 0)) | |
154 | kfree(chip); | |
155 | ||
156 | pr_info("%s handling gpio %d -> %d\n", | |
157 | pfc->name, pfc->first_gpio, pfc->last_gpio); | |
158 | ||
159 | return ret; | |
160 | } | |
161 | EXPORT_SYMBOL_GPL(sh_pfc_register_gpiochip); | |
162 | ||
163 | static int sh_pfc_gpio_match(struct gpio_chip *gc, void *data) | |
164 | { | |
165 | return !!strstr(gc->label, data); | |
166 | } | |
167 | ||
168 | static int __devinit sh_pfc_gpio_probe(struct platform_device *pdev) | |
169 | { | |
170 | struct sh_pfc_chip *chip; | |
171 | struct gpio_chip *gc; | |
172 | ||
173 | gc = gpiochip_find("_pfc", sh_pfc_gpio_match); | |
174 | if (unlikely(!gc)) { | |
175 | pr_err("Cant find gpio chip\n"); | |
176 | return -ENODEV; | |
177 | } | |
178 | ||
179 | chip = gpio_to_pfc_chip(gc); | |
180 | platform_set_drvdata(pdev, chip); | |
181 | ||
182 | pr_info("attaching to GPIO chip %s\n", chip->pfc->name); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static int __devexit sh_pfc_gpio_remove(struct platform_device *pdev) | |
188 | { | |
189 | struct sh_pfc_chip *chip = platform_get_drvdata(pdev); | |
190 | int ret; | |
191 | ||
192 | ret = gpiochip_remove(&chip->gpio_chip); | |
193 | if (unlikely(ret < 0)) | |
194 | return ret; | |
195 | ||
196 | kfree(chip); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static struct platform_driver sh_pfc_gpio_driver = { | |
201 | .probe = sh_pfc_gpio_probe, | |
202 | .remove = __devexit_p(sh_pfc_gpio_remove), | |
203 | .driver = { | |
204 | .name = KBUILD_MODNAME, | |
205 | .owner = THIS_MODULE, | |
206 | }, | |
207 | }; | |
208 | ||
209 | static struct platform_device sh_pfc_gpio_device = { | |
210 | .name = KBUILD_MODNAME, | |
211 | .id = -1, | |
212 | }; | |
213 | ||
214 | static int __init sh_pfc_gpio_init(void) | |
215 | { | |
216 | int rc; | |
217 | ||
218 | rc = platform_driver_register(&sh_pfc_gpio_driver); | |
219 | if (likely(!rc)) { | |
220 | rc = platform_device_register(&sh_pfc_gpio_device); | |
221 | if (unlikely(rc)) | |
222 | platform_driver_unregister(&sh_pfc_gpio_driver); | |
223 | } | |
224 | ||
225 | return rc; | |
226 | } | |
227 | ||
228 | static void __exit sh_pfc_gpio_exit(void) | |
229 | { | |
230 | platform_device_unregister(&sh_pfc_gpio_device); | |
231 | platform_driver_unregister(&sh_pfc_gpio_driver); | |
232 | } | |
233 | ||
234 | module_init(sh_pfc_gpio_init); | |
235 | module_exit(sh_pfc_gpio_exit); | |
236 | ||
237 | MODULE_AUTHOR("Magnus Damm, Paul Mundt"); | |
238 | MODULE_DESCRIPTION("GPIO driver for SuperH pin function controller"); | |
239 | MODULE_LICENSE("GPL v2"); | |
240 | MODULE_ALIAS("platform:pfc-gpio"); |