Commit | Line | Data |
---|---|---|
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 | */ | |
c6193eac LP |
11 | |
12 | #define pr_fmt(fmt) KBUILD_MODNAME " gpio: " fmt | |
b3c185a7 | 13 | |
1724acfd | 14 | #include <linux/device.h> |
b3c185a7 | 15 | #include <linux/gpio.h> |
90efde22 | 16 | #include <linux/init.h> |
b3c185a7 | 17 | #include <linux/module.h> |
ca5481c6 | 18 | #include <linux/pinctrl/consumer.h> |
90efde22 LP |
19 | #include <linux/slab.h> |
20 | #include <linux/spinlock.h> | |
b3c185a7 | 21 | |
f9165132 LP |
22 | #include "core.h" |
23 | ||
b3c185a7 PM |
24 | struct sh_pfc_chip { |
25 | struct sh_pfc *pfc; | |
26 | struct gpio_chip gpio_chip; | |
27 | }; | |
28 | ||
29 | static struct sh_pfc_chip *gpio_to_pfc_chip(struct gpio_chip *gc) | |
30 | { | |
31 | return container_of(gc, struct sh_pfc_chip, gpio_chip); | |
32 | } | |
33 | ||
34 | static struct sh_pfc *gpio_to_pfc(struct gpio_chip *gc) | |
35 | { | |
36 | return gpio_to_pfc_chip(gc)->pfc; | |
37 | } | |
38 | ||
16883814 LP |
39 | /* ----------------------------------------------------------------------------- |
40 | * Pin GPIOs | |
41 | */ | |
b3c185a7 | 42 | |
16883814 | 43 | static int gpio_pin_request(struct gpio_chip *gc, unsigned offset) |
b3c185a7 | 44 | { |
0b73ee5d LP |
45 | struct sh_pfc *pfc = gpio_to_pfc(gc); |
46 | ||
47 | if (pfc->info->pins[offset].enum_id == 0) | |
48 | return -EINVAL; | |
49 | ||
16883814 | 50 | return pinctrl_request_gpio(offset); |
b3c185a7 PM |
51 | } |
52 | ||
16883814 | 53 | static void gpio_pin_free(struct gpio_chip *gc, unsigned offset) |
b3c185a7 | 54 | { |
16883814 | 55 | return pinctrl_free_gpio(offset); |
b3c185a7 PM |
56 | } |
57 | ||
16883814 | 58 | static void gpio_pin_set_value(struct sh_pfc *pfc, unsigned offset, int value) |
b3c185a7 | 59 | { |
0b73ee5d LP |
60 | struct pinmux_data_reg *dr; |
61 | int bit; | |
b3c185a7 | 62 | |
0b73ee5d | 63 | sh_pfc_get_data_reg(pfc, offset, &dr, &bit); |
16883814 | 64 | sh_pfc_write_bit(dr, bit, value); |
b3c185a7 PM |
65 | } |
66 | ||
16883814 | 67 | static int gpio_pin_direction_input(struct gpio_chip *gc, unsigned offset) |
ca5481c6 PM |
68 | { |
69 | return pinctrl_gpio_direction_input(offset); | |
70 | } | |
71 | ||
16883814 | 72 | static int gpio_pin_direction_output(struct gpio_chip *gc, unsigned offset, |
ca5481c6 PM |
73 | int value) |
74 | { | |
16883814 | 75 | gpio_pin_set_value(gpio_to_pfc(gc), offset, value); |
ca5481c6 PM |
76 | |
77 | return pinctrl_gpio_direction_output(offset); | |
78 | } | |
79 | ||
16883814 | 80 | static int gpio_pin_get(struct gpio_chip *gc, unsigned offset) |
b3c185a7 | 81 | { |
16883814 | 82 | struct sh_pfc *pfc = gpio_to_pfc(gc); |
0b73ee5d LP |
83 | struct pinmux_data_reg *dr; |
84 | int bit; | |
16883814 | 85 | |
0b73ee5d | 86 | sh_pfc_get_data_reg(pfc, offset, &dr, &bit); |
16883814 | 87 | return sh_pfc_read_bit(dr, bit); |
b3c185a7 PM |
88 | } |
89 | ||
16883814 | 90 | static void gpio_pin_set(struct gpio_chip *gc, unsigned offset, int value) |
b3c185a7 | 91 | { |
16883814 | 92 | gpio_pin_set_value(gpio_to_pfc(gc), offset, value); |
b3c185a7 PM |
93 | } |
94 | ||
16883814 | 95 | static int gpio_pin_to_irq(struct gpio_chip *gc, unsigned offset) |
b3c185a7 PM |
96 | { |
97 | struct sh_pfc *pfc = gpio_to_pfc(gc); | |
c07f54f6 LP |
98 | int i, k; |
99 | ||
100 | for (i = 0; i < pfc->info->gpio_irq_size; i++) { | |
101 | unsigned short *gpios = pfc->info->gpio_irq[i].gpios; | |
102 | ||
103 | for (k = 0; gpios[k]; k++) { | |
104 | if (gpios[k] == offset) | |
105 | return pfc->info->gpio_irq[i].irq; | |
b3c185a7 PM |
106 | } |
107 | } | |
108 | ||
109 | return -ENOSYS; | |
110 | } | |
111 | ||
16883814 | 112 | static void gpio_pin_setup(struct sh_pfc_chip *chip) |
b3c185a7 PM |
113 | { |
114 | struct sh_pfc *pfc = chip->pfc; | |
115 | struct gpio_chip *gc = &chip->gpio_chip; | |
116 | ||
16883814 LP |
117 | gc->request = gpio_pin_request; |
118 | gc->free = gpio_pin_free; | |
119 | gc->direction_input = gpio_pin_direction_input; | |
120 | gc->get = gpio_pin_get; | |
121 | gc->direction_output = gpio_pin_direction_output; | |
122 | gc->set = gpio_pin_set; | |
123 | gc->to_irq = gpio_pin_to_irq; | |
b3c185a7 | 124 | |
19bb7fe3 | 125 | gc->label = pfc->info->name; |
16883814 | 126 | gc->dev = pfc->dev; |
b3c185a7 | 127 | gc->owner = THIS_MODULE; |
d7a7ca57 | 128 | gc->base = 0; |
16883814 | 129 | gc->ngpio = pfc->info->nr_pins; |
b3c185a7 PM |
130 | } |
131 | ||
16883814 LP |
132 | /* ----------------------------------------------------------------------------- |
133 | * Function GPIOs | |
134 | */ | |
135 | ||
136 | static int gpio_function_request(struct gpio_chip *gc, unsigned offset) | |
137 | { | |
138 | struct sh_pfc *pfc = gpio_to_pfc(gc); | |
a68fdca9 | 139 | unsigned int mark = pfc->info->func_gpios[offset].enum_id; |
16883814 LP |
140 | unsigned long flags; |
141 | int ret = -EINVAL; | |
142 | ||
143 | pr_notice_once("Use of GPIO API for function requests is deprecated, convert to pinctrl\n"); | |
144 | ||
a68fdca9 | 145 | if (mark == 0) |
16883814 LP |
146 | return ret; |
147 | ||
148 | spin_lock_irqsave(&pfc->lock, flags); | |
149 | ||
a68fdca9 | 150 | if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_DRYRUN)) |
16883814 LP |
151 | goto done; |
152 | ||
a68fdca9 | 153 | if (sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_REQ)) |
16883814 LP |
154 | goto done; |
155 | ||
156 | ret = 0; | |
157 | ||
158 | done: | |
159 | spin_unlock_irqrestore(&pfc->lock, flags); | |
160 | return ret; | |
161 | } | |
162 | ||
163 | static void gpio_function_free(struct gpio_chip *gc, unsigned offset) | |
164 | { | |
165 | struct sh_pfc *pfc = gpio_to_pfc(gc); | |
a68fdca9 | 166 | unsigned int mark = pfc->info->func_gpios[offset].enum_id; |
16883814 LP |
167 | unsigned long flags; |
168 | ||
169 | spin_lock_irqsave(&pfc->lock, flags); | |
170 | ||
a68fdca9 | 171 | sh_pfc_config_mux(pfc, mark, PINMUX_TYPE_FUNCTION, GPIO_CFG_FREE); |
16883814 LP |
172 | |
173 | spin_unlock_irqrestore(&pfc->lock, flags); | |
174 | } | |
175 | ||
176 | static void gpio_function_setup(struct sh_pfc_chip *chip) | |
177 | { | |
178 | struct sh_pfc *pfc = chip->pfc; | |
179 | struct gpio_chip *gc = &chip->gpio_chip; | |
180 | ||
181 | gc->request = gpio_function_request; | |
182 | gc->free = gpio_function_free; | |
183 | ||
184 | gc->label = pfc->info->name; | |
185 | gc->owner = THIS_MODULE; | |
186 | gc->base = pfc->info->nr_pins; | |
187 | gc->ngpio = pfc->info->nr_func_gpios; | |
188 | } | |
189 | ||
190 | /* ----------------------------------------------------------------------------- | |
191 | * Register/unregister | |
192 | */ | |
193 | ||
194 | static struct sh_pfc_chip * | |
195 | sh_pfc_add_gpiochip(struct sh_pfc *pfc, void(*setup)(struct sh_pfc_chip *)) | |
b3c185a7 PM |
196 | { |
197 | struct sh_pfc_chip *chip; | |
198 | int ret; | |
199 | ||
1724acfd | 200 | chip = devm_kzalloc(pfc->dev, sizeof(*chip), GFP_KERNEL); |
b3c185a7 | 201 | if (unlikely(!chip)) |
16883814 | 202 | return ERR_PTR(-ENOMEM); |
b3c185a7 PM |
203 | |
204 | chip->pfc = pfc; | |
205 | ||
16883814 | 206 | setup(chip); |
b3c185a7 PM |
207 | |
208 | ret = gpiochip_add(&chip->gpio_chip); | |
1724acfd | 209 | if (unlikely(ret < 0)) |
16883814 LP |
210 | return ERR_PTR(ret); |
211 | ||
212 | pr_info("%s handling gpio %u -> %u\n", | |
213 | chip->gpio_chip.label, chip->gpio_chip.base, | |
214 | chip->gpio_chip.base + chip->gpio_chip.ngpio - 1); | |
215 | ||
216 | return chip; | |
217 | } | |
218 | ||
219 | int sh_pfc_register_gpiochip(struct sh_pfc *pfc) | |
220 | { | |
221 | struct sh_pfc_chip *chip; | |
222 | ||
223 | chip = sh_pfc_add_gpiochip(pfc, gpio_pin_setup); | |
224 | if (IS_ERR(chip)) | |
225 | return PTR_ERR(chip); | |
6f6a4a68 LP |
226 | |
227 | pfc->gpio = chip; | |
b3c185a7 | 228 | |
16883814 LP |
229 | chip = sh_pfc_add_gpiochip(pfc, gpio_function_setup); |
230 | if (IS_ERR(chip)) | |
231 | return PTR_ERR(chip); | |
232 | ||
233 | pfc->func = chip; | |
b3c185a7 | 234 | |
b3c185a7 PM |
235 | return 0; |
236 | } | |
237 | ||
6f6a4a68 | 238 | int sh_pfc_unregister_gpiochip(struct sh_pfc *pfc) |
b3c185a7 | 239 | { |
16883814 | 240 | int err; |
b3c185a7 PM |
241 | int ret; |
242 | ||
16883814 LP |
243 | ret = gpiochip_remove(&pfc->gpio->gpio_chip); |
244 | err = gpiochip_remove(&pfc->func->gpio_chip); | |
b3c185a7 | 245 | |
16883814 | 246 | return ret < 0 ? ret : err; |
b3c185a7 | 247 | } |