Commit | Line | Data |
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3cd2550c | 1 | /* |
2 | * MPC52xx gpio driver | |
3 | * | |
4 | * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix | |
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 version 2 | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include <linux/of.h> | |
21 | #include <linux/kernel.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
3cd2550c | 23 | #include <linux/of_gpio.h> |
24 | #include <linux/io.h> | |
25 | #include <linux/of_platform.h> | |
bb207ef1 | 26 | #include <linux/module.h> |
3cd2550c | 27 | |
28 | #include <asm/gpio.h> | |
29 | #include <asm/mpc52xx.h> | |
30 | #include <sysdev/fsl_soc.h> | |
31 | ||
32 | static DEFINE_SPINLOCK(gpio_lock); | |
33 | ||
34 | struct mpc52xx_gpiochip { | |
35 | struct of_mm_gpio_chip mmchip; | |
36 | unsigned int shadow_dvo; | |
37 | unsigned int shadow_gpioe; | |
38 | unsigned int shadow_ddr; | |
39 | }; | |
40 | ||
41 | /* | |
42 | * GPIO LIB API implementation for wakeup GPIOs. | |
43 | * | |
44 | * There's a maximum of 8 wakeup GPIOs. Which of these are available | |
45 | * for use depends on your board setup. | |
46 | * | |
47 | * 0 -> GPIO_WKUP_7 | |
48 | * 1 -> GPIO_WKUP_6 | |
49 | * 2 -> PSC6_1 | |
50 | * 3 -> PSC6_0 | |
51 | * 4 -> ETH_17 | |
52 | * 5 -> PSC3_9 | |
53 | * 6 -> PSC2_4 | |
54 | * 7 -> PSC1_4 | |
55 | * | |
56 | */ | |
57 | static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) | |
58 | { | |
59 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
60 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; | |
61 | unsigned int ret; | |
62 | ||
63 | ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; | |
64 | ||
65 | pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); | |
66 | ||
67 | return ret; | |
68 | } | |
69 | ||
70 | static inline void | |
71 | __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
72 | { | |
73 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
74 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
75 | struct mpc52xx_gpiochip, mmchip); | |
76 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; | |
77 | ||
78 | if (val) | |
79 | chip->shadow_dvo |= 1 << (7 - gpio); | |
80 | else | |
81 | chip->shadow_dvo &= ~(1 << (7 - gpio)); | |
82 | ||
83 | out_8(®s->wkup_dvo, chip->shadow_dvo); | |
84 | } | |
85 | ||
86 | static void | |
87 | mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
88 | { | |
89 | unsigned long flags; | |
90 | ||
91 | spin_lock_irqsave(&gpio_lock, flags); | |
92 | ||
93 | __mpc52xx_wkup_gpio_set(gc, gpio, val); | |
94 | ||
95 | spin_unlock_irqrestore(&gpio_lock, flags); | |
96 | ||
97 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
98 | } | |
99 | ||
100 | static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) | |
101 | { | |
102 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
103 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
104 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 105 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
3cd2550c | 106 | unsigned long flags; |
107 | ||
108 | spin_lock_irqsave(&gpio_lock, flags); | |
109 | ||
110 | /* set the direction */ | |
111 | chip->shadow_ddr &= ~(1 << (7 - gpio)); | |
112 | out_8(®s->wkup_ddr, chip->shadow_ddr); | |
113 | ||
114 | /* and enable the pin */ | |
115 | chip->shadow_gpioe |= 1 << (7 - gpio); | |
116 | out_8(®s->wkup_gpioe, chip->shadow_gpioe); | |
117 | ||
118 | spin_unlock_irqrestore(&gpio_lock, flags); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int | |
124 | mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | |
125 | { | |
126 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
93072457 | 127 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
3cd2550c | 128 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
129 | struct mpc52xx_gpiochip, mmchip); | |
130 | unsigned long flags; | |
131 | ||
132 | spin_lock_irqsave(&gpio_lock, flags); | |
133 | ||
134 | __mpc52xx_wkup_gpio_set(gc, gpio, val); | |
135 | ||
136 | /* Then set direction */ | |
137 | chip->shadow_ddr |= 1 << (7 - gpio); | |
138 | out_8(®s->wkup_ddr, chip->shadow_ddr); | |
139 | ||
140 | /* Finally enable the pin */ | |
141 | chip->shadow_gpioe |= 1 << (7 - gpio); | |
142 | out_8(®s->wkup_gpioe, chip->shadow_gpioe); | |
143 | ||
144 | spin_unlock_irqrestore(&gpio_lock, flags); | |
145 | ||
146 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
3836309d | 151 | static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) |
3cd2550c | 152 | { |
153 | struct mpc52xx_gpiochip *chip; | |
93072457 | 154 | struct mpc52xx_gpio_wkup __iomem *regs; |
a19e3da5 | 155 | struct gpio_chip *gc; |
3cd2550c | 156 | int ret; |
157 | ||
158 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
159 | if (!chip) | |
160 | return -ENOMEM; | |
161 | ||
a19e3da5 | 162 | gc = &chip->mmchip.gc; |
3cd2550c | 163 | |
a19e3da5 AV |
164 | gc->ngpio = 8; |
165 | gc->direction_input = mpc52xx_wkup_gpio_dir_in; | |
166 | gc->direction_output = mpc52xx_wkup_gpio_dir_out; | |
167 | gc->get = mpc52xx_wkup_gpio_get; | |
168 | gc->set = mpc52xx_wkup_gpio_set; | |
3cd2550c | 169 | |
61c7a080 | 170 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
3cd2550c | 171 | if (ret) |
172 | return ret; | |
173 | ||
174 | regs = chip->mmchip.regs; | |
175 | chip->shadow_gpioe = in_8(®s->wkup_gpioe); | |
176 | chip->shadow_ddr = in_8(®s->wkup_ddr); | |
177 | chip->shadow_dvo = in_8(®s->wkup_dvo); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
a454dc50 | 182 | static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) |
3cd2550c | 183 | { |
184 | return -EBUSY; | |
185 | } | |
186 | ||
187 | static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { | |
6eae1ace | 188 | { .compatible = "fsl,mpc5200-gpio-wkup", }, |
3cd2550c | 189 | {} |
190 | }; | |
191 | ||
00006124 | 192 | static struct platform_driver mpc52xx_wkup_gpiochip_driver = { |
4018294b | 193 | .driver = { |
6eae1ace | 194 | .name = "mpc5200-gpio-wkup", |
4018294b GL |
195 | .owner = THIS_MODULE, |
196 | .of_match_table = mpc52xx_wkup_gpiochip_match, | |
197 | }, | |
3cd2550c | 198 | .probe = mpc52xx_wkup_gpiochip_probe, |
199 | .remove = mpc52xx_gpiochip_remove, | |
200 | }; | |
201 | ||
202 | /* | |
203 | * GPIO LIB API implementation for simple GPIOs | |
204 | * | |
205 | * There's a maximum of 32 simple GPIOs. Which of these are available | |
206 | * for use depends on your board setup. | |
207 | * The numbering reflects the bit numbering in the port registers: | |
208 | * | |
209 | * 0..1 > reserved | |
210 | * 2..3 > IRDA | |
211 | * 4..7 > ETHR | |
212 | * 8..11 > reserved | |
213 | * 12..15 > USB | |
214 | * 16..17 > reserved | |
215 | * 18..23 > PSC3 | |
216 | * 24..27 > PSC2 | |
217 | * 28..31 > PSC1 | |
218 | */ | |
219 | static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) | |
220 | { | |
221 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
222 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; | |
223 | unsigned int ret; | |
224 | ||
225 | ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static inline void | |
231 | __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
232 | { | |
233 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
234 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
235 | struct mpc52xx_gpiochip, mmchip); | |
236 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; | |
237 | ||
238 | if (val) | |
239 | chip->shadow_dvo |= 1 << (31 - gpio); | |
240 | else | |
241 | chip->shadow_dvo &= ~(1 << (31 - gpio)); | |
242 | out_be32(®s->simple_dvo, chip->shadow_dvo); | |
243 | } | |
244 | ||
245 | static void | |
246 | mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
247 | { | |
248 | unsigned long flags; | |
249 | ||
250 | spin_lock_irqsave(&gpio_lock, flags); | |
251 | ||
252 | __mpc52xx_simple_gpio_set(gc, gpio, val); | |
253 | ||
254 | spin_unlock_irqrestore(&gpio_lock, flags); | |
255 | ||
256 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
257 | } | |
258 | ||
259 | static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) | |
260 | { | |
261 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
262 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
263 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 264 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
3cd2550c | 265 | unsigned long flags; |
266 | ||
267 | spin_lock_irqsave(&gpio_lock, flags); | |
268 | ||
269 | /* set the direction */ | |
270 | chip->shadow_ddr &= ~(1 << (31 - gpio)); | |
271 | out_be32(®s->simple_ddr, chip->shadow_ddr); | |
272 | ||
273 | /* and enable the pin */ | |
274 | chip->shadow_gpioe |= 1 << (31 - gpio); | |
275 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); | |
276 | ||
277 | spin_unlock_irqrestore(&gpio_lock, flags); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | static int | |
283 | mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | |
284 | { | |
285 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
286 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
287 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 288 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
3cd2550c | 289 | unsigned long flags; |
290 | ||
291 | spin_lock_irqsave(&gpio_lock, flags); | |
292 | ||
293 | /* First set initial value */ | |
294 | __mpc52xx_simple_gpio_set(gc, gpio, val); | |
295 | ||
296 | /* Then set direction */ | |
297 | chip->shadow_ddr |= 1 << (31 - gpio); | |
298 | out_be32(®s->simple_ddr, chip->shadow_ddr); | |
299 | ||
300 | /* Finally enable the pin */ | |
301 | chip->shadow_gpioe |= 1 << (31 - gpio); | |
302 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); | |
303 | ||
304 | spin_unlock_irqrestore(&gpio_lock, flags); | |
305 | ||
306 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
3836309d | 311 | static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) |
3cd2550c | 312 | { |
313 | struct mpc52xx_gpiochip *chip; | |
a19e3da5 | 314 | struct gpio_chip *gc; |
93072457 | 315 | struct mpc52xx_gpio __iomem *regs; |
3cd2550c | 316 | int ret; |
317 | ||
318 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
319 | if (!chip) | |
320 | return -ENOMEM; | |
321 | ||
a19e3da5 | 322 | gc = &chip->mmchip.gc; |
3cd2550c | 323 | |
a19e3da5 AV |
324 | gc->ngpio = 32; |
325 | gc->direction_input = mpc52xx_simple_gpio_dir_in; | |
326 | gc->direction_output = mpc52xx_simple_gpio_dir_out; | |
327 | gc->get = mpc52xx_simple_gpio_get; | |
328 | gc->set = mpc52xx_simple_gpio_set; | |
3cd2550c | 329 | |
61c7a080 | 330 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
3cd2550c | 331 | if (ret) |
332 | return ret; | |
333 | ||
334 | regs = chip->mmchip.regs; | |
335 | chip->shadow_gpioe = in_be32(®s->simple_gpioe); | |
336 | chip->shadow_ddr = in_be32(®s->simple_ddr); | |
337 | chip->shadow_dvo = in_be32(®s->simple_dvo); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { | |
6eae1ace | 343 | { .compatible = "fsl,mpc5200-gpio", }, |
3cd2550c | 344 | {} |
345 | }; | |
346 | ||
00006124 | 347 | static struct platform_driver mpc52xx_simple_gpiochip_driver = { |
4018294b | 348 | .driver = { |
6eae1ace | 349 | .name = "mpc5200-gpio", |
4018294b GL |
350 | .owner = THIS_MODULE, |
351 | .of_match_table = mpc52xx_simple_gpiochip_match, | |
352 | }, | |
3cd2550c | 353 | .probe = mpc52xx_simple_gpiochip_probe, |
354 | .remove = mpc52xx_gpiochip_remove, | |
355 | }; | |
356 | ||
3cd2550c | 357 | static int __init mpc52xx_gpio_init(void) |
358 | { | |
00006124 | 359 | if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) |
3cd2550c | 360 | printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); |
361 | ||
00006124 | 362 | if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) |
3cd2550c | 363 | printk(KERN_ERR "Unable to register simple GPIO driver\n"); |
364 | ||
3cd2550c | 365 | return 0; |
366 | } | |
367 | ||
368 | ||
369 | /* Make sure we get initialised before anyone else tries to use us */ | |
370 | subsys_initcall(mpc52xx_gpio_init); | |
371 | ||
372 | /* No exit call at the moment as we cannot unregister of gpio chips */ | |
373 | ||
374 | MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); | |
375 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); | |
376 | MODULE_LICENSE("GPL v2"); | |
377 |