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x86, mrst: use a temporary variable for SFI irq
[linux-btrfs-devel.git] / drivers / gpio / gpio-tc3589x.c
blob2a82e8999a4299553a4ebeec273a69b55663df61
1 /*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License, version 2
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
7 */
8
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/platform_device.h>
12 #include <linux/slab.h>
13 #include <linux/gpio.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/mfd/tc3589x.h>
17
18 /*
19 * These registers are modified under the irq bus lock and cached to avoid
20 * unnecessary writes in bus_sync_unlock.
21 */
22 enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
23
24 #define CACHE_NR_REGS 4
25 #define CACHE_NR_BANKS 3
26
27 struct tc3589x_gpio {
28 struct gpio_chip chip;
29 struct tc3589x *tc3589x;
30 struct device *dev;
31 struct mutex irq_lock;
32
33 int irq_base;
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 tc3589x_gpio *to_tc3589x_gpio(struct gpio_chip *chip)
41 {
42 return container_of(chip, struct tc3589x_gpio, chip);
43 }
44
45 static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned offset)
46 {
47 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
48 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
49 u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
50 u8 mask = 1 << (offset % 8);
51 int ret;
52
53 ret = tc3589x_reg_read(tc3589x, reg);
54 if (ret < 0)
55 return ret;
56
57 return ret & mask;
58 }
59
60 static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
61 {
62 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
63 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
64 u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
65 unsigned pos = offset % 8;
66 u8 data[] = {!!val << pos, 1 << pos};
67
68 tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
69 }
70
71 static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
72 unsigned offset, int val)
73 {
74 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
75 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
76 u8 reg = TC3589x_GPIODIR0 + offset / 8;
77 unsigned pos = offset % 8;
78
79 tc3589x_gpio_set(chip, offset, val);
80
81 return tc3589x_set_bits(tc3589x, reg, 1 << pos, 1 << pos);
82 }
83
84 static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
85 unsigned offset)
86 {
87 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
88 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
89 u8 reg = TC3589x_GPIODIR0 + offset / 8;
90 unsigned pos = offset % 8;
91
92 return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
93 }
94
95 static int tc3589x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
96 {
97 struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
98
99 return tc3589x_gpio->irq_base + offset;
100 }
101
102 static struct gpio_chip template_chip = {
103 .label = "tc3589x",
104 .owner = THIS_MODULE,
105 .direction_input = tc3589x_gpio_direction_input,
106 .get = tc3589x_gpio_get,
107 .direction_output = tc3589x_gpio_direction_output,
108 .set = tc3589x_gpio_set,
109 .to_irq = tc3589x_gpio_to_irq,
110 .can_sleep = 1,
111 };
112
113 static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
114 {
115 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
116 int offset = d->irq - tc3589x_gpio->irq_base;
117 int regoffset = offset / 8;
118 int mask = 1 << (offset % 8);
119
120 if (type == IRQ_TYPE_EDGE_BOTH) {
121 tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
122 return 0;
123 }
124
125 tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
126
127 if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
128 tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
129 else
130 tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
131
132 if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
133 tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
134 else
135 tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
136
137 return 0;
138 }
139
140 static void tc3589x_gpio_irq_lock(struct irq_data *d)
141 {
142 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
143
144 mutex_lock(&tc3589x_gpio->irq_lock);
145 }
146
147 static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
148 {
149 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
150 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
151 static const u8 regmap[] = {
152 [REG_IBE] = TC3589x_GPIOIBE0,
153 [REG_IEV] = TC3589x_GPIOIEV0,
154 [REG_IS] = TC3589x_GPIOIS0,
155 [REG_IE] = TC3589x_GPIOIE0,
156 };
157 int i, j;
158
159 for (i = 0; i < CACHE_NR_REGS; i++) {
160 for (j = 0; j < CACHE_NR_BANKS; j++) {
161 u8 old = tc3589x_gpio->oldregs[i][j];
162 u8 new = tc3589x_gpio->regs[i][j];
163
164 if (new == old)
165 continue;
166
167 tc3589x_gpio->oldregs[i][j] = new;
168 tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
169 }
170 }
171
172 mutex_unlock(&tc3589x_gpio->irq_lock);
173 }
174
175 static void tc3589x_gpio_irq_mask(struct irq_data *d)
176 {
177 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
178 int offset = d->irq - tc3589x_gpio->irq_base;
179 int regoffset = offset / 8;
180 int mask = 1 << (offset % 8);
181
182 tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
183 }
184
185 static void tc3589x_gpio_irq_unmask(struct irq_data *d)
186 {
187 struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
188 int offset = d->irq - tc3589x_gpio->irq_base;
189 int regoffset = offset / 8;
190 int mask = 1 << (offset % 8);
191
192 tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
193 }
194
195 static struct irq_chip tc3589x_gpio_irq_chip = {
196 .name = "tc3589x-gpio",
197 .irq_bus_lock = tc3589x_gpio_irq_lock,
198 .irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
199 .irq_mask = tc3589x_gpio_irq_mask,
200 .irq_unmask = tc3589x_gpio_irq_unmask,
201 .irq_set_type = tc3589x_gpio_irq_set_type,
202 };
203
204 static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
205 {
206 struct tc3589x_gpio *tc3589x_gpio = dev;
207 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
208 u8 status[CACHE_NR_BANKS];
209 int ret;
210 int i;
211
212 ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
213 ARRAY_SIZE(status), status);
214 if (ret < 0)
215 return IRQ_NONE;
216
217 for (i = 0; i < ARRAY_SIZE(status); i++) {
218 unsigned int stat = status[i];
219 if (!stat)
220 continue;
221
222 while (stat) {
223 int bit = __ffs(stat);
224 int line = i * 8 + bit;
225
226 handle_nested_irq(tc3589x_gpio->irq_base + line);
227 stat &= ~(1 << bit);
228 }
229
230 tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
231 }
232
233 return IRQ_HANDLED;
234 }
235
236 static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio)
237 {
238 int base = tc3589x_gpio->irq_base;
239 int irq;
240
241 for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
242 irq_set_chip_data(irq, tc3589x_gpio);
243 irq_set_chip_and_handler(irq, &tc3589x_gpio_irq_chip,
244 handle_simple_irq);
245 irq_set_nested_thread(irq, 1);
246 #ifdef CONFIG_ARM
247 set_irq_flags(irq, IRQF_VALID);
248 #else
249 irq_set_noprobe(irq);
250 #endif
251 }
252
253 return 0;
254 }
255
256 static void tc3589x_gpio_irq_remove(struct tc3589x_gpio *tc3589x_gpio)
257 {
258 int base = tc3589x_gpio->irq_base;
259 int irq;
260
261 for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
262 #ifdef CONFIG_ARM
263 set_irq_flags(irq, 0);
264 #endif
265 irq_set_chip_and_handler(irq, NULL, NULL);
266 irq_set_chip_data(irq, NULL);
267 }
268 }
269
270 static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
271 {
272 struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
273 struct tc3589x_gpio_platform_data *pdata;
274 struct tc3589x_gpio *tc3589x_gpio;
275 int ret;
276 int irq;
277
278 pdata = tc3589x->pdata->gpio;
279 if (!pdata)
280 return -ENODEV;
281
282 irq = platform_get_irq(pdev, 0);
283 if (irq < 0)
284 return irq;
285
286 tc3589x_gpio = kzalloc(sizeof(struct tc3589x_gpio), GFP_KERNEL);
287 if (!tc3589x_gpio)
288 return -ENOMEM;
289
290 mutex_init(&tc3589x_gpio->irq_lock);
291
292 tc3589x_gpio->dev = &pdev->dev;
293 tc3589x_gpio->tc3589x = tc3589x;
294
295 tc3589x_gpio->chip = template_chip;
296 tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
297 tc3589x_gpio->chip.dev = &pdev->dev;
298 tc3589x_gpio->chip.base = pdata->gpio_base;
299
300 tc3589x_gpio->irq_base = tc3589x->irq_base + TC3589x_INT_GPIO(0);
301
302 /* Bring the GPIO module out of reset */
303 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
304 TC3589x_RSTCTRL_GPIRST, 0);
305 if (ret < 0)
306 goto out_free;
307
308 ret = tc3589x_gpio_irq_init(tc3589x_gpio);
309 if (ret)
310 goto out_free;
311
312 ret = request_threaded_irq(irq, NULL, tc3589x_gpio_irq, IRQF_ONESHOT,
313 "tc3589x-gpio", tc3589x_gpio);
314 if (ret) {
315 dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
316 goto out_removeirq;
317 }
318
319 ret = gpiochip_add(&tc3589x_gpio->chip);
320 if (ret) {
321 dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
322 goto out_freeirq;
323 }
324
325 if (pdata->setup)
326 pdata->setup(tc3589x, tc3589x_gpio->chip.base);
327
328 platform_set_drvdata(pdev, tc3589x_gpio);
329
330 return 0;
331
332 out_freeirq:
333 free_irq(irq, tc3589x_gpio);
334 out_removeirq:
335 tc3589x_gpio_irq_remove(tc3589x_gpio);
336 out_free:
337 kfree(tc3589x_gpio);
338 return ret;
339 }
340
341 static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
342 {
343 struct tc3589x_gpio *tc3589x_gpio = platform_get_drvdata(pdev);
344 struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
345 struct tc3589x_gpio_platform_data *pdata = tc3589x->pdata->gpio;
346 int irq = platform_get_irq(pdev, 0);
347 int ret;
348
349 if (pdata->remove)
350 pdata->remove(tc3589x, tc3589x_gpio->chip.base);
351
352 ret = gpiochip_remove(&tc3589x_gpio->chip);
353 if (ret < 0) {
354 dev_err(tc3589x_gpio->dev,
355 "unable to remove gpiochip: %d\n", ret);
356 return ret;
357 }
358
359 free_irq(irq, tc3589x_gpio);
360 tc3589x_gpio_irq_remove(tc3589x_gpio);
361
362 platform_set_drvdata(pdev, NULL);
363 kfree(tc3589x_gpio);
364
365 return 0;
366 }
367
368 static struct platform_driver tc3589x_gpio_driver = {
369 .driver.name = "tc3589x-gpio",
370 .driver.owner = THIS_MODULE,
371 .probe = tc3589x_gpio_probe,
372 .remove = __devexit_p(tc3589x_gpio_remove),
373 };
374
375 static int __init tc3589x_gpio_init(void)
376 {
377 return platform_driver_register(&tc3589x_gpio_driver);
378 }
379 subsys_initcall(tc3589x_gpio_init);
380
381 static void __exit tc3589x_gpio_exit(void)
382 {
383 platform_driver_unregister(&tc3589x_gpio_driver);
384 }
385 module_exit(tc3589x_gpio_exit);
386
387 MODULE_LICENSE("GPL v2");
388 MODULE_DESCRIPTION("TC3589x GPIO driver");
389 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
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