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[S390] crash_dump: remove duplicate include
[zen-stable.git] / drivers / gpio / gpio-stmpe.c
blob87a68a896abf7a0a010aa6395db5b0a53ba9ba41
1 /*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License, version 2
5 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
6 */
7
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/platform_device.h>
11 #include <linux/slab.h>
12 #include <linux/gpio.h>
13 #include <linux/irq.h>
14 #include <linux/interrupt.h>
15 #include <linux/mfd/stmpe.h>
16
17 /*
18 * These registers are modified under the irq bus lock and cached to avoid
19 * unnecessary writes in bus_sync_unlock.
20 */
21 enum { REG_RE, REG_FE, REG_IE };
22
23 #define CACHE_NR_REGS 3
24 #define CACHE_NR_BANKS (STMPE_NR_GPIOS / 8)
25
26 struct stmpe_gpio {
27 struct gpio_chip chip;
28 struct stmpe *stmpe;
29 struct device *dev;
30 struct mutex irq_lock;
31
32 int irq_base;
33 unsigned norequest_mask;
34
35 /* Caches of interrupt control registers for bus_lock */
36 u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
37 u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
38 };
39
40 static inline struct stmpe_gpio *to_stmpe_gpio(struct gpio_chip *chip)
41 {
42 return container_of(chip, struct stmpe_gpio, chip);
43 }
44
45 static int stmpe_gpio_get(struct gpio_chip *chip, unsigned offset)
46 {
47 struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
48 struct stmpe *stmpe = stmpe_gpio->stmpe;
49 u8 reg = stmpe->regs[STMPE_IDX_GPMR_LSB] - (offset / 8);
50 u8 mask = 1 << (offset % 8);
51 int ret;
52
53 ret = stmpe_reg_read(stmpe, reg);
54 if (ret < 0)
55 return ret;
56
57 return ret & mask;
58 }
59
60 static void stmpe_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
61 {
62 struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
63 struct stmpe *stmpe = stmpe_gpio->stmpe;
64 int which = val ? STMPE_IDX_GPSR_LSB : STMPE_IDX_GPCR_LSB;
65 u8 reg = stmpe->regs[which] - (offset / 8);
66 u8 mask = 1 << (offset % 8);
67
68 /*
69 * Some variants have single register for gpio set/clear functionality.
70 * For them we need to write 0 to clear and 1 to set.
71 */
72 if (stmpe->regs[STMPE_IDX_GPSR_LSB] == stmpe->regs[STMPE_IDX_GPCR_LSB])
73 stmpe_set_bits(stmpe, reg, mask, val ? mask : 0);
74 else
75 stmpe_reg_write(stmpe, reg, mask);
76 }
77
78 static int stmpe_gpio_direction_output(struct gpio_chip *chip,
79 unsigned offset, int val)
80 {
81 struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
82 struct stmpe *stmpe = stmpe_gpio->stmpe;
83 u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8);
84 u8 mask = 1 << (offset % 8);
85
86 stmpe_gpio_set(chip, offset, val);
87
88 return stmpe_set_bits(stmpe, reg, mask, mask);
89 }
90
91 static int stmpe_gpio_direction_input(struct gpio_chip *chip,
92 unsigned offset)
93 {
94 struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
95 struct stmpe *stmpe = stmpe_gpio->stmpe;
96 u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8);
97 u8 mask = 1 << (offset % 8);
98
99 return stmpe_set_bits(stmpe, reg, mask, 0);
100 }
101
102 static int stmpe_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
103 {
104 struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
105
106 return stmpe_gpio->irq_base + offset;
107 }
108
109 static int stmpe_gpio_request(struct gpio_chip *chip, unsigned offset)
110 {
111 struct stmpe_gpio *stmpe_gpio = to_stmpe_gpio(chip);
112 struct stmpe *stmpe = stmpe_gpio->stmpe;
113
114 if (stmpe_gpio->norequest_mask & (1 << offset))
115 return -EINVAL;
116
117 return stmpe_set_altfunc(stmpe, 1 << offset, STMPE_BLOCK_GPIO);
118 }
119
120 static struct gpio_chip template_chip = {
121 .label = "stmpe",
122 .owner = THIS_MODULE,
123 .direction_input = stmpe_gpio_direction_input,
124 .get = stmpe_gpio_get,
125 .direction_output = stmpe_gpio_direction_output,
126 .set = stmpe_gpio_set,
127 .to_irq = stmpe_gpio_to_irq,
128 .request = stmpe_gpio_request,
129 .can_sleep = 1,
130 };
131
132 static int stmpe_gpio_irq_set_type(struct irq_data *d, unsigned int type)
133 {
134 struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
135 int offset = d->irq - stmpe_gpio->irq_base;
136 int regoffset = offset / 8;
137 int mask = 1 << (offset % 8);
138
139 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
140 return -EINVAL;
141
142 /* STMPE801 doesn't have RE and FE registers */
143 if (stmpe_gpio->stmpe->partnum == STMPE801)
144 return 0;
145
146 if (type == IRQ_TYPE_EDGE_RISING)
147 stmpe_gpio->regs[REG_RE][regoffset] |= mask;
148 else
149 stmpe_gpio->regs[REG_RE][regoffset] &= ~mask;
150
151 if (type == IRQ_TYPE_EDGE_FALLING)
152 stmpe_gpio->regs[REG_FE][regoffset] |= mask;
153 else
154 stmpe_gpio->regs[REG_FE][regoffset] &= ~mask;
155
156 return 0;
157 }
158
159 static void stmpe_gpio_irq_lock(struct irq_data *d)
160 {
161 struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
162
163 mutex_lock(&stmpe_gpio->irq_lock);
164 }
165
166 static void stmpe_gpio_irq_sync_unlock(struct irq_data *d)
167 {
168 struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
169 struct stmpe *stmpe = stmpe_gpio->stmpe;
170 int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8);
171 static const u8 regmap[] = {
172 [REG_RE] = STMPE_IDX_GPRER_LSB,
173 [REG_FE] = STMPE_IDX_GPFER_LSB,
174 [REG_IE] = STMPE_IDX_IEGPIOR_LSB,
175 };
176 int i, j;
177
178 for (i = 0; i < CACHE_NR_REGS; i++) {
179 /* STMPE801 doesn't have RE and FE registers */
180 if ((stmpe->partnum == STMPE801) &&
181 (i != REG_IE))
182 continue;
183
184 for (j = 0; j < num_banks; j++) {
185 u8 old = stmpe_gpio->oldregs[i][j];
186 u8 new = stmpe_gpio->regs[i][j];
187
188 if (new == old)
189 continue;
190
191 stmpe_gpio->oldregs[i][j] = new;
192 stmpe_reg_write(stmpe, stmpe->regs[regmap[i]] - j, new);
193 }
194 }
195
196 mutex_unlock(&stmpe_gpio->irq_lock);
197 }
198
199 static void stmpe_gpio_irq_mask(struct irq_data *d)
200 {
201 struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
202 int offset = d->irq - stmpe_gpio->irq_base;
203 int regoffset = offset / 8;
204 int mask = 1 << (offset % 8);
205
206 stmpe_gpio->regs[REG_IE][regoffset] &= ~mask;
207 }
208
209 static void stmpe_gpio_irq_unmask(struct irq_data *d)
210 {
211 struct stmpe_gpio *stmpe_gpio = irq_data_get_irq_chip_data(d);
212 int offset = d->irq - stmpe_gpio->irq_base;
213 int regoffset = offset / 8;
214 int mask = 1 << (offset % 8);
215
216 stmpe_gpio->regs[REG_IE][regoffset] |= mask;
217 }
218
219 static struct irq_chip stmpe_gpio_irq_chip = {
220 .name = "stmpe-gpio",
221 .irq_bus_lock = stmpe_gpio_irq_lock,
222 .irq_bus_sync_unlock = stmpe_gpio_irq_sync_unlock,
223 .irq_mask = stmpe_gpio_irq_mask,
224 .irq_unmask = stmpe_gpio_irq_unmask,
225 .irq_set_type = stmpe_gpio_irq_set_type,
226 };
227
228 static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
229 {
230 struct stmpe_gpio *stmpe_gpio = dev;
231 struct stmpe *stmpe = stmpe_gpio->stmpe;
232 u8 statmsbreg = stmpe->regs[STMPE_IDX_ISGPIOR_MSB];
233 int num_banks = DIV_ROUND_UP(stmpe->num_gpios, 8);
234 u8 status[num_banks];
235 int ret;
236 int i;
237
238 ret = stmpe_block_read(stmpe, statmsbreg, num_banks, status);
239 if (ret < 0)
240 return IRQ_NONE;
241
242 for (i = 0; i < num_banks; i++) {
243 int bank = num_banks - i - 1;
244 unsigned int enabled = stmpe_gpio->regs[REG_IE][bank];
245 unsigned int stat = status[i];
246
247 stat &= enabled;
248 if (!stat)
249 continue;
250
251 while (stat) {
252 int bit = __ffs(stat);
253 int line = bank * 8 + bit;
254
255 handle_nested_irq(stmpe_gpio->irq_base + line);
256 stat &= ~(1 << bit);
257 }
258
259 stmpe_reg_write(stmpe, statmsbreg + i, status[i]);
260
261 /* Edge detect register is not present on 801 */
262 if (stmpe->partnum != STMPE801)
263 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_MSB]
264 + i, status[i]);
265 }
266
267 return IRQ_HANDLED;
268 }
269
270 static int __devinit stmpe_gpio_irq_init(struct stmpe_gpio *stmpe_gpio)
271 {
272 int base = stmpe_gpio->irq_base;
273 int irq;
274
275 for (irq = base; irq < base + stmpe_gpio->chip.ngpio; irq++) {
276 irq_set_chip_data(irq, stmpe_gpio);
277 irq_set_chip_and_handler(irq, &stmpe_gpio_irq_chip,
278 handle_simple_irq);
279 irq_set_nested_thread(irq, 1);
280 #ifdef CONFIG_ARM
281 set_irq_flags(irq, IRQF_VALID);
282 #else
283 irq_set_noprobe(irq);
284 #endif
285 }
286
287 return 0;
288 }
289
290 static void stmpe_gpio_irq_remove(struct stmpe_gpio *stmpe_gpio)
291 {
292 int base = stmpe_gpio->irq_base;
293 int irq;
294
295 for (irq = base; irq < base + stmpe_gpio->chip.ngpio; irq++) {
296 #ifdef CONFIG_ARM
297 set_irq_flags(irq, 0);
298 #endif
299 irq_set_chip_and_handler(irq, NULL, NULL);
300 irq_set_chip_data(irq, NULL);
301 }
302 }
303
304 static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
305 {
306 struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
307 struct stmpe_gpio_platform_data *pdata;
308 struct stmpe_gpio *stmpe_gpio;
309 int ret;
310 int irq;
311
312 pdata = stmpe->pdata->gpio;
313
314 irq = platform_get_irq(pdev, 0);
315 if (irq < 0)
316 return irq;
317
318 stmpe_gpio = kzalloc(sizeof(struct stmpe_gpio), GFP_KERNEL);
319 if (!stmpe_gpio)
320 return -ENOMEM;
321
322 mutex_init(&stmpe_gpio->irq_lock);
323
324 stmpe_gpio->dev = &pdev->dev;
325 stmpe_gpio->stmpe = stmpe;
326 stmpe_gpio->norequest_mask = pdata ? pdata->norequest_mask : 0;
327
328 stmpe_gpio->chip = template_chip;
329 stmpe_gpio->chip.ngpio = stmpe->num_gpios;
330 stmpe_gpio->chip.dev = &pdev->dev;
331 stmpe_gpio->chip.base = pdata ? pdata->gpio_base : -1;
332
333 stmpe_gpio->irq_base = stmpe->irq_base + STMPE_INT_GPIO(0);
334
335 ret = stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
336 if (ret)
337 goto out_free;
338
339 ret = stmpe_gpio_irq_init(stmpe_gpio);
340 if (ret)
341 goto out_disable;
342
343 ret = request_threaded_irq(irq, NULL, stmpe_gpio_irq, IRQF_ONESHOT,
344 "stmpe-gpio", stmpe_gpio);
345 if (ret) {
346 dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
347 goto out_removeirq;
348 }
349
350 ret = gpiochip_add(&stmpe_gpio->chip);
351 if (ret) {
352 dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
353 goto out_freeirq;
354 }
355
356 if (pdata && pdata->setup)
357 pdata->setup(stmpe, stmpe_gpio->chip.base);
358
359 platform_set_drvdata(pdev, stmpe_gpio);
360
361 return 0;
362
363 out_freeirq:
364 free_irq(irq, stmpe_gpio);
365 out_removeirq:
366 stmpe_gpio_irq_remove(stmpe_gpio);
367 out_disable:
368 stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
369 out_free:
370 kfree(stmpe_gpio);
371 return ret;
372 }
373
374 static int __devexit stmpe_gpio_remove(struct platform_device *pdev)
375 {
376 struct stmpe_gpio *stmpe_gpio = platform_get_drvdata(pdev);
377 struct stmpe *stmpe = stmpe_gpio->stmpe;
378 struct stmpe_gpio_platform_data *pdata = stmpe->pdata->gpio;
379 int irq = platform_get_irq(pdev, 0);
380 int ret;
381
382 if (pdata && pdata->remove)
383 pdata->remove(stmpe, stmpe_gpio->chip.base);
384
385 ret = gpiochip_remove(&stmpe_gpio->chip);
386 if (ret < 0) {
387 dev_err(stmpe_gpio->dev,
388 "unable to remove gpiochip: %d\n", ret);
389 return ret;
390 }
391
392 stmpe_disable(stmpe, STMPE_BLOCK_GPIO);
393
394 free_irq(irq, stmpe_gpio);
395 stmpe_gpio_irq_remove(stmpe_gpio);
396 platform_set_drvdata(pdev, NULL);
397 kfree(stmpe_gpio);
398
399 return 0;
400 }
401
402 static struct platform_driver stmpe_gpio_driver = {
403 .driver.name = "stmpe-gpio",
404 .driver.owner = THIS_MODULE,
405 .probe = stmpe_gpio_probe,
406 .remove = __devexit_p(stmpe_gpio_remove),
407 };
408
409 static int __init stmpe_gpio_init(void)
410 {
411 return platform_driver_register(&stmpe_gpio_driver);
412 }
413 subsys_initcall(stmpe_gpio_init);
414
415 static void __exit stmpe_gpio_exit(void)
416 {
417 platform_driver_unregister(&stmpe_gpio_driver);
418 }
419 module_exit(stmpe_gpio_exit);
420
421 MODULE_LICENSE("GPL v2");
422 MODULE_DESCRIPTION("STMPExxxx GPIO driver");
423 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");