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>
22 #include <linux/slab.h>
23 #include <linux/of_gpio.h>
24 #include <linux/io.h>
25 #include <linux/of_platform.h>
26 #include <linux/module.h>
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 */
mpc52xx_wkup_gpio_get(struct gpio_chip * gc,unsigned int gpio)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
__mpc52xx_wkup_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)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
mpc52xx_wkup_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)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
mpc52xx_wkup_gpio_dir_in(struct gpio_chip * gc,unsigned int gpio)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);
105 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
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
mpc52xx_wkup_gpio_dir_out(struct gpio_chip * gc,unsigned int gpio,int val)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);
127 struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
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
mpc52xx_wkup_gpiochip_probe(struct platform_device * ofdev)151 static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
152 {
153 struct mpc52xx_gpiochip *chip;
154 struct mpc52xx_gpio_wkup __iomem *regs;
155 struct gpio_chip *gc;
156 int ret;
157
158 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
159 if (!chip)
160 return -ENOMEM;
161
162 gc = &chip->mmchip.gc;
163
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;
169
170 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
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
mpc52xx_gpiochip_remove(struct platform_device * ofdev)182 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
183 {
184 return -EBUSY;
185 }
186
187 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
188 { .compatible = "fsl,mpc5200-gpio-wkup", },
189 {}
190 };
191
192 static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
193 .driver = {
194 .name = "mpc5200-gpio-wkup",
195 .owner = THIS_MODULE,
196 .of_match_table = mpc52xx_wkup_gpiochip_match,
197 },
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 */
mpc52xx_simple_gpio_get(struct gpio_chip * gc,unsigned int gpio)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
__mpc52xx_simple_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)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
mpc52xx_simple_gpio_set(struct gpio_chip * gc,unsigned int gpio,int val)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
mpc52xx_simple_gpio_dir_in(struct gpio_chip * gc,unsigned int gpio)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);
264 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
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
mpc52xx_simple_gpio_dir_out(struct gpio_chip * gc,unsigned int gpio,int val)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);
288 struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
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
mpc52xx_simple_gpiochip_probe(struct platform_device * ofdev)311 static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
312 {
313 struct mpc52xx_gpiochip *chip;
314 struct gpio_chip *gc;
315 struct mpc52xx_gpio __iomem *regs;
316 int ret;
317
318 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
319 if (!chip)
320 return -ENOMEM;
321
322 gc = &chip->mmchip.gc;
323
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;
329
330 ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
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[] = {
343 { .compatible = "fsl,mpc5200-gpio", },
344 {}
345 };
346
347 static struct platform_driver mpc52xx_simple_gpiochip_driver = {
348 .driver = {
349 .name = "mpc5200-gpio",
350 .owner = THIS_MODULE,
351 .of_match_table = mpc52xx_simple_gpiochip_match,
352 },
353 .probe = mpc52xx_simple_gpiochip_probe,
354 .remove = mpc52xx_gpiochip_remove,
355 };
356
mpc52xx_gpio_init(void)357 static int __init mpc52xx_gpio_init(void)
358 {
359 if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
360 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
361
362 if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
363 printk(KERN_ERR "Unable to register simple GPIO driver\n");
364
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
378