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> | |
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 | ||
00006124 | 150 | static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev) |
3cd2550c | 151 | { |
152 | struct mpc52xx_gpiochip *chip; | |
93072457 | 153 | struct mpc52xx_gpio_wkup __iomem *regs; |
a19e3da5 | 154 | struct gpio_chip *gc; |
3cd2550c | 155 | int ret; |
156 | ||
157 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
158 | if (!chip) | |
159 | return -ENOMEM; | |
160 | ||
a19e3da5 | 161 | gc = &chip->mmchip.gc; |
3cd2550c | 162 | |
a19e3da5 AV |
163 | gc->ngpio = 8; |
164 | gc->direction_input = mpc52xx_wkup_gpio_dir_in; | |
165 | gc->direction_output = mpc52xx_wkup_gpio_dir_out; | |
166 | gc->get = mpc52xx_wkup_gpio_get; | |
167 | gc->set = mpc52xx_wkup_gpio_set; | |
3cd2550c | 168 | |
61c7a080 | 169 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
3cd2550c | 170 | if (ret) |
171 | return ret; | |
172 | ||
173 | regs = chip->mmchip.regs; | |
174 | chip->shadow_gpioe = in_8(®s->wkup_gpioe); | |
175 | chip->shadow_ddr = in_8(®s->wkup_ddr); | |
176 | chip->shadow_dvo = in_8(®s->wkup_dvo); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
a454dc50 | 181 | static int mpc52xx_gpiochip_remove(struct platform_device *ofdev) |
3cd2550c | 182 | { |
183 | return -EBUSY; | |
184 | } | |
185 | ||
186 | static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = { | |
187 | { | |
188 | .compatible = "fsl,mpc5200-gpio-wkup", | |
189 | }, | |
190 | {} | |
191 | }; | |
192 | ||
00006124 | 193 | static struct platform_driver mpc52xx_wkup_gpiochip_driver = { |
4018294b GL |
194 | .driver = { |
195 | .name = "gpio_wkup", | |
196 | .owner = THIS_MODULE, | |
197 | .of_match_table = mpc52xx_wkup_gpiochip_match, | |
198 | }, | |
3cd2550c | 199 | .probe = mpc52xx_wkup_gpiochip_probe, |
200 | .remove = mpc52xx_gpiochip_remove, | |
201 | }; | |
202 | ||
203 | /* | |
204 | * GPIO LIB API implementation for simple GPIOs | |
205 | * | |
206 | * There's a maximum of 32 simple GPIOs. Which of these are available | |
207 | * for use depends on your board setup. | |
208 | * The numbering reflects the bit numbering in the port registers: | |
209 | * | |
210 | * 0..1 > reserved | |
211 | * 2..3 > IRDA | |
212 | * 4..7 > ETHR | |
213 | * 8..11 > reserved | |
214 | * 12..15 > USB | |
215 | * 16..17 > reserved | |
216 | * 18..23 > PSC3 | |
217 | * 24..27 > PSC2 | |
218 | * 28..31 > PSC1 | |
219 | */ | |
220 | static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio) | |
221 | { | |
222 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
223 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; | |
224 | unsigned int ret; | |
225 | ||
226 | ret = (in_be32(®s->simple_ival) >> (31 - gpio)) & 1; | |
227 | ||
228 | return ret; | |
229 | } | |
230 | ||
231 | static inline void | |
232 | __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
233 | { | |
234 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
235 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
236 | struct mpc52xx_gpiochip, mmchip); | |
237 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; | |
238 | ||
239 | if (val) | |
240 | chip->shadow_dvo |= 1 << (31 - gpio); | |
241 | else | |
242 | chip->shadow_dvo &= ~(1 << (31 - gpio)); | |
243 | out_be32(®s->simple_dvo, chip->shadow_dvo); | |
244 | } | |
245 | ||
246 | static void | |
247 | mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) | |
248 | { | |
249 | unsigned long flags; | |
250 | ||
251 | spin_lock_irqsave(&gpio_lock, flags); | |
252 | ||
253 | __mpc52xx_simple_gpio_set(gc, gpio, val); | |
254 | ||
255 | spin_unlock_irqrestore(&gpio_lock, flags); | |
256 | ||
257 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
258 | } | |
259 | ||
260 | static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio) | |
261 | { | |
262 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
263 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
264 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 265 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
3cd2550c | 266 | unsigned long flags; |
267 | ||
268 | spin_lock_irqsave(&gpio_lock, flags); | |
269 | ||
270 | /* set the direction */ | |
271 | chip->shadow_ddr &= ~(1 << (31 - gpio)); | |
272 | out_be32(®s->simple_ddr, chip->shadow_ddr); | |
273 | ||
274 | /* and enable the pin */ | |
275 | chip->shadow_gpioe |= 1 << (31 - gpio); | |
276 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); | |
277 | ||
278 | spin_unlock_irqrestore(&gpio_lock, flags); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | static int | |
284 | mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) | |
285 | { | |
286 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); | |
287 | struct mpc52xx_gpiochip *chip = container_of(mm_gc, | |
288 | struct mpc52xx_gpiochip, mmchip); | |
93072457 | 289 | struct mpc52xx_gpio __iomem *regs = mm_gc->regs; |
3cd2550c | 290 | unsigned long flags; |
291 | ||
292 | spin_lock_irqsave(&gpio_lock, flags); | |
293 | ||
294 | /* First set initial value */ | |
295 | __mpc52xx_simple_gpio_set(gc, gpio, val); | |
296 | ||
297 | /* Then set direction */ | |
298 | chip->shadow_ddr |= 1 << (31 - gpio); | |
299 | out_be32(®s->simple_ddr, chip->shadow_ddr); | |
300 | ||
301 | /* Finally enable the pin */ | |
302 | chip->shadow_gpioe |= 1 << (31 - gpio); | |
303 | out_be32(®s->simple_gpioe, chip->shadow_gpioe); | |
304 | ||
305 | spin_unlock_irqrestore(&gpio_lock, flags); | |
306 | ||
307 | pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
00006124 | 312 | static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev) |
3cd2550c | 313 | { |
314 | struct mpc52xx_gpiochip *chip; | |
a19e3da5 | 315 | struct gpio_chip *gc; |
93072457 | 316 | struct mpc52xx_gpio __iomem *regs; |
3cd2550c | 317 | int ret; |
318 | ||
319 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); | |
320 | if (!chip) | |
321 | return -ENOMEM; | |
322 | ||
a19e3da5 | 323 | gc = &chip->mmchip.gc; |
3cd2550c | 324 | |
a19e3da5 AV |
325 | gc->ngpio = 32; |
326 | gc->direction_input = mpc52xx_simple_gpio_dir_in; | |
327 | gc->direction_output = mpc52xx_simple_gpio_dir_out; | |
328 | gc->get = mpc52xx_simple_gpio_get; | |
329 | gc->set = mpc52xx_simple_gpio_set; | |
3cd2550c | 330 | |
61c7a080 | 331 | ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip); |
3cd2550c | 332 | if (ret) |
333 | return ret; | |
334 | ||
335 | regs = chip->mmchip.regs; | |
336 | chip->shadow_gpioe = in_be32(®s->simple_gpioe); | |
337 | chip->shadow_ddr = in_be32(®s->simple_ddr); | |
338 | chip->shadow_dvo = in_be32(®s->simple_dvo); | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | static const struct of_device_id mpc52xx_simple_gpiochip_match[] = { | |
344 | { | |
345 | .compatible = "fsl,mpc5200-gpio", | |
346 | }, | |
347 | {} | |
348 | }; | |
349 | ||
00006124 | 350 | static struct platform_driver mpc52xx_simple_gpiochip_driver = { |
4018294b GL |
351 | .driver = { |
352 | .name = "gpio", | |
353 | .owner = THIS_MODULE, | |
354 | .of_match_table = mpc52xx_simple_gpiochip_match, | |
355 | }, | |
3cd2550c | 356 | .probe = mpc52xx_simple_gpiochip_probe, |
357 | .remove = mpc52xx_gpiochip_remove, | |
358 | }; | |
359 | ||
3cd2550c | 360 | static int __init mpc52xx_gpio_init(void) |
361 | { | |
00006124 | 362 | if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver)) |
3cd2550c | 363 | printk(KERN_ERR "Unable to register wakeup GPIO driver\n"); |
364 | ||
00006124 | 365 | if (platform_driver_register(&mpc52xx_simple_gpiochip_driver)) |
3cd2550c | 366 | printk(KERN_ERR "Unable to register simple GPIO driver\n"); |
367 | ||
3cd2550c | 368 | return 0; |
369 | } | |
370 | ||
371 | ||
372 | /* Make sure we get initialised before anyone else tries to use us */ | |
373 | subsys_initcall(mpc52xx_gpio_init); | |
374 | ||
375 | /* No exit call at the moment as we cannot unregister of gpio chips */ | |
376 | ||
377 | MODULE_DESCRIPTION("Freescale MPC52xx gpio driver"); | |
378 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de"); | |
379 | MODULE_LICENSE("GPL v2"); | |
380 |