Commit | Line | Data |
---|---|---|
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> | |
26 | ||
27 | #include <asm/gpio.h> | |
28 | #include <asm/mpc52xx.h> | |
29 | #include <sysdev/fsl_soc.h> | |
30 | ||
31 | static DEFINE_SPINLOCK(gpio_lock); | |
32 | ||
33 | struct mpc52xx_gpiochip { | |
34 | struct of_mm_gpio_chip mmchip; | |
35 | unsigned int shadow_dvo; | |
36 | unsigned int shadow_gpioe; | |
37 | unsigned int shadow_ddr; | |
38 | }; | |
39 | ||
40 | /* | |
41 | * GPIO LIB API implementation for wakeup GPIOs. | |
42 | * | |
43 | * There's a maximum of 8 wakeup GPIOs. Which of these are available | |
44 | * for use depends on your board setup. | |
45 | * | |
46 | * 0 -> GPIO_WKUP_7 | |
47 | * 1 -> GPIO_WKUP_6 | |
48 | * 2 -> PSC6_1 | |
49 | * 3 -> PSC6_0 | |
50 | * 4 -> ETH_17 | |
51 | * 5 -> PSC3_9 | |
52 | * 6 -> PSC2_4 | |
53 | * 7 -> PSC1_4 | |
54 | * | |
55 | */ | |
56 | static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio) | |
57 | { | |
58 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
59 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; | |
60 | unsigned int ret; | |
61 | ||
62 | ret = (in_8(®s->wkup_ival) >> (7 - gpio)) & 1; | |
63 | ||
64 | pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret); | |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
69 | static inline void | |
70 | __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
71 | { | |
72 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
73 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
74 | struct mpc52xx_gpiochip, mmchip); | |
75 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; | |
76 | ||
77 | if (val) | |
78 | chip->shadow_dvo |= 1 << (7 - gpio); | |
79 | else | |
80 | chip->shadow_dvo &= ~(1 << (7 - gpio)); | |
81 | ||
82 | out_8(®s->wkup_dvo, chip->shadow_dvo); | |
83 | } | |
84 | ||
85 | static void | |
86 | mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
87 | { | |
88 | unsigned long flags; | |
89 | ||
90 | spin_lock_irqsave(&gpio_lock, flags); | |
91 | ||
92 | __mpc52xx_wkup_gpio_set(gc, gpio, val); | |
93 | ||
94 | spin_unlock_irqrestore(&gpio_lock, flags); | |
95 | ||
96 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
97 | } | |
98 | ||
99 | static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) | |
100 | { | |
101 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
102 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
103 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 104 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
3cd2550c | 105 | unsigned long flags; |
106 | ||
107 | spin_lock_irqsave(&gpio_lock, flags); | |
108 | ||
109 | /* set the direction */ | |
110 | chip->shadow_ddr &= ~(1 << (7 - gpio)); | |
111 | out_8(®s->wkup_ddr, chip->shadow_ddr); | |
112 | ||
113 | /* and enable the pin */ | |
114 | chip->shadow_gpioe |= 1 << (7 - gpio); | |
115 | out_8(®s->wkup_gpioe, chip->shadow_gpioe); | |
116 | ||
117 | spin_unlock_irqrestore(&gpio_lock, flags); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static int | |
123 | mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | |
124 | { | |
125 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
93072457 | 126 | struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs; |
3cd2550c | 127 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, |
128 | struct mpc52xx_gpiochip, mmchip); | |
129 | unsigned long flags; | |
130 | ||
131 | spin_lock_irqsave(&gpio_lock, flags); | |
132 | ||
133 | __mpc52xx_wkup_gpio_set(gc, gpio, val); | |
134 | ||
135 | /* Then set direction */ | |
136 | chip->shadow_ddr |= 1 << (7 - gpio); | |
137 | out_8(®s->wkup_ddr, chip->shadow_ddr); | |
138 | ||
139 | /* Finally enable the pin */ | |
140 | chip->shadow_gpioe |= 1 << (7 - gpio); | |
141 | out_8(®s->wkup_gpioe, chip->shadow_gpioe); | |
142 | ||
143 | spin_unlock_irqrestore(&gpio_lock, flags); | |
144 | ||
145 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
a454dc50 | 150 | static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev, |
3cd2550c | 151 | const struct of_device_id *match) |
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[] = { | |
188 | { | |
189 | .compatible = "fsl,mpc5200-gpio-wkup", | |
190 | }, | |
191 | {} | |
192 | }; | |
193 | ||
194 | static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = { | |
4018294b GL |
195 | .driver = { |
196 | .name = "gpio_wkup", | |
197 | .owner = THIS_MODULE, | |
198 | .of_match_table = mpc52xx_wkup_gpiochip_match, | |
199 | }, | |
3cd2550c | 200 | .probe = mpc52xx_wkup_gpiochip_probe, |
201 | .remove = mpc52xx_gpiochip_remove, | |
202 | }; | |
203 | ||
204 | /* | |
205 | * GPIO LIB API implementation for simple GPIOs | |
206 | * | |
207 | * There's a maximum of 32 simple GPIOs. Which of these are available | |
208 | * for use depends on your board setup. | |
209 | * The numbering reflects the bit numbering in the port registers: | |
210 | * | |
211 | * 0..1 > reserved | |
212 | * 2..3 > IRDA | |
213 | * 4..7 > ETHR | |
214 | * 8..11 > reserved | |
215 | * 12..15 > USB | |
216 | * 16..17 > reserved | |
217 | * 18..23 > PSC3 | |
218 | * 24..27 > PSC2 | |
219 | * 28..31 > PSC1 | |
220 | */ | |
221 | static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) | |
222 | { | |
223 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
224 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; | |
225 | unsigned int ret; | |
226 | ||
227 | ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | static inline void | |
233 | __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
234 | { | |
235 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
236 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
237 | struct mpc52xx_gpiochip, mmchip); | |
238 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; | |
239 | ||
240 | if (val) | |
241 | chip->shadow_dvo |= 1 << (31 - gpio); | |
242 | else | |
243 | chip->shadow_dvo &= ~(1 << (31 - gpio)); | |
244 | out_be32(®s->simple_dvo, chip->shadow_dvo); | |
245 | } | |
246 | ||
247 | static void | |
248 | mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
249 | { | |
250 | unsigned long flags; | |
251 | ||
252 | spin_lock_irqsave(&gpio_lock, flags); | |
253 | ||
254 | __mpc52xx_simple_gpio_set(gc, gpio, val); | |
255 | ||
256 | spin_unlock_irqrestore(&gpio_lock, flags); | |
257 | ||
258 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
259 | } | |
260 | ||
261 | static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) | |
262 | { | |
263 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
264 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
265 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 266 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
3cd2550c | 267 | unsigned long flags; |
268 | ||
269 | spin_lock_irqsave(&gpio_lock, flags); | |
270 | ||
271 | /* set the direction */ | |
272 | chip->shadow_ddr &= ~(1 << (31 - gpio)); | |
273 | out_be32(®s->simple_ddr, chip->shadow_ddr); | |
274 | ||
275 | /* and enable the pin */ | |
276 | chip->shadow_gpioe |= 1 << (31 - gpio); | |
277 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); | |
278 | ||
279 | spin_unlock_irqrestore(&gpio_lock, flags); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | static int | |
285 | mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | |
286 | { | |
287 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
288 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
289 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 290 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
3cd2550c | 291 | unsigned long flags; |
292 | ||
293 | spin_lock_irqsave(&gpio_lock, flags); | |
294 | ||
295 | /* First set initial value */ | |
296 | __mpc52xx_simple_gpio_set(gc, gpio, val); | |
297 | ||
298 | /* Then set direction */ | |
299 | chip->shadow_ddr |= 1 << (31 - gpio); | |
300 | out_be32(®s->simple_ddr, chip->shadow_ddr); | |
301 | ||
302 | /* Finally enable the pin */ | |
303 | chip->shadow_gpioe |= 1 << (31 - gpio); | |
304 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); | |
305 | ||
306 | spin_unlock_irqrestore(&gpio_lock, flags); | |
307 | ||
308 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
a454dc50 | 313 | static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev, |
3cd2550c | 314 | const struct of_device_id *match) |
315 | { | |
316 | struct mpc52xx_gpiochip *chip; | |
a19e3da5 | 317 | struct gpio_chip *gc; |
93072457 | 318 | struct mpc52xx_gpio __iomem *regs; |
3cd2550c | 319 | int ret; |
320 | ||
321 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
322 | if (!chip) | |
323 | return -ENOMEM; | |
324 | ||
a19e3da5 | 325 | gc = &chip->mmchip.gc; |
3cd2550c | 326 | |
a19e3da5 AV |
327 | gc->ngpio = 32; |
328 | gc->direction_input = mpc52xx_simple_gpio_dir_in; | |
329 | gc->direction_output = mpc52xx_simple_gpio_dir_out; | |
330 | gc->get = mpc52xx_simple_gpio_get; | |
331 | gc->set = mpc52xx_simple_gpio_set; | |
3cd2550c | 332 | |
61c7a080 | 333 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
3cd2550c | 334 | if (ret) |
335 | return ret; | |
336 | ||
337 | regs = chip->mmchip.regs; | |
338 | chip->shadow_gpioe = in_be32(®s->simple_gpioe); | |
339 | chip->shadow_ddr = in_be32(®s->simple_ddr); | |
340 | chip->shadow_dvo = in_be32(®s->simple_dvo); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { | |
346 | { | |
347 | .compatible = "fsl,mpc5200-gpio", | |
348 | }, | |
349 | {} | |
350 | }; | |
351 | ||
352 | static struct of_platform_driver mpc52xx_simple_gpiochip_driver = { | |
4018294b GL |
353 | .driver = { |
354 | .name = "gpio", | |
355 | .owner = THIS_MODULE, | |
356 | .of_match_table = mpc52xx_simple_gpiochip_match, | |
357 | }, | |
3cd2550c | 358 | .probe = mpc52xx_simple_gpiochip_probe, |
359 | .remove = mpc52xx_gpiochip_remove, | |
360 | }; | |
361 | ||
3cd2550c | 362 | static int __init mpc52xx_gpio_init(void) |
363 | { | |
364 | if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver)) | |
365 | printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); | |
366 | ||
367 | if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver)) | |
368 | printk(KERN_ERR "Unable to register simple GPIO driver\n"); | |
369 | ||
3cd2550c | 370 | return 0; |
371 | } | |
372 | ||
373 | ||
374 | /* Make sure we get initialised before anyone else tries to use us */ | |
375 | subsys_initcall(mpc52xx_gpio_init); | |
376 | ||
377 | /* No exit call at the moment as we cannot unregister of gpio chips */ | |
378 | ||
379 | MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); | |
380 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); | |
381 | MODULE_LICENSE("GPL v2"); | |
382 |