1 /*
2 * Sonics Silicon Backplane
3 * GPIO driver
4 *
5 * Copyright 2011, Broadcom Corporation
6 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
7 *
8 * Licensed under the GNU/GPL. See COPYING for details.
9 */
10
11 #include "ssb_private.h"
12
13 #include <linux/gpio/driver.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqdomain.h>
17 #include <linux/export.h>
18 #include <linux/ssb/ssb.h>
19
20
21 /**************************************************
22 * Shared
23 **************************************************/
24
25 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
ssb_gpio_to_irq(struct gpio_chip * chip,unsigned int gpio)26 static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned int gpio)
27 {
28 struct ssb_bus *bus = gpiochip_get_data(chip);
29
30 if (bus->bustype == SSB_BUSTYPE_SSB)
31 return irq_find_mapping(bus->irq_domain, gpio);
32 else
33 return -EINVAL;
34 }
35 #endif
36
37 /**************************************************
38 * ChipCommon
39 **************************************************/
40
ssb_gpio_chipco_get_value(struct gpio_chip * chip,unsigned int gpio)41 static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned int gpio)
42 {
43 struct ssb_bus *bus = gpiochip_get_data(chip);
44
45 return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
46 }
47
ssb_gpio_chipco_set_value(struct gpio_chip * chip,unsigned int gpio,int value)48 static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned int gpio,
49 int value)
50 {
51 struct ssb_bus *bus = gpiochip_get_data(chip);
52
53 ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
54 }
55
ssb_gpio_chipco_direction_input(struct gpio_chip * chip,unsigned int gpio)56 static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
57 unsigned int gpio)
58 {
59 struct ssb_bus *bus = gpiochip_get_data(chip);
60
61 ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
62 return 0;
63 }
64
ssb_gpio_chipco_direction_output(struct gpio_chip * chip,unsigned int gpio,int value)65 static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
66 unsigned int gpio, int value)
67 {
68 struct ssb_bus *bus = gpiochip_get_data(chip);
69
70 ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
71 ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
72 return 0;
73 }
74
ssb_gpio_chipco_request(struct gpio_chip * chip,unsigned int gpio)75 static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned int gpio)
76 {
77 struct ssb_bus *bus = gpiochip_get_data(chip);
78
79 ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
80 /* clear pulldown */
81 ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
82 /* Set pullup */
83 ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);
84
85 return 0;
86 }
87
ssb_gpio_chipco_free(struct gpio_chip * chip,unsigned int gpio)88 static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned int gpio)
89 {
90 struct ssb_bus *bus = gpiochip_get_data(chip);
91
92 /* clear pullup */
93 ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
94 }
95
96 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
ssb_gpio_irq_chipco_mask(struct irq_data * d)97 static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
98 {
99 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
100 int gpio = irqd_to_hwirq(d);
101
102 ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
103 }
104
ssb_gpio_irq_chipco_unmask(struct irq_data * d)105 static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
106 {
107 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
108 int gpio = irqd_to_hwirq(d);
109 u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));
110
111 ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
112 ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
113 }
114
115 static struct irq_chip ssb_gpio_irq_chipco_chip = {
116 .name = "SSB-GPIO-CC",
117 .irq_mask = ssb_gpio_irq_chipco_mask,
118 .irq_unmask = ssb_gpio_irq_chipco_unmask,
119 };
120
ssb_gpio_irq_chipco_handler(int irq,void * dev_id)121 static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
122 {
123 struct ssb_bus *bus = dev_id;
124 struct ssb_chipcommon *chipco = &bus->chipco;
125 u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
126 u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
127 u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
128 unsigned long irqs = (val ^ pol) & mask;
129 int gpio;
130
131 if (!irqs)
132 return IRQ_NONE;
133
134 for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
135 generic_handle_domain_irq_safe(bus->irq_domain, gpio);
136
137 ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);
138
139 return IRQ_HANDLED;
140 }
141
ssb_gpio_irq_chipco_domain_init(struct ssb_bus * bus)142 static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
143 {
144 struct ssb_chipcommon *chipco = &bus->chipco;
145 struct gpio_chip *chip = &bus->gpio;
146 int gpio, hwirq, err;
147
148 if (bus->bustype != SSB_BUSTYPE_SSB)
149 return 0;
150
151 bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
152 &irq_domain_simple_ops, chipco);
153 if (!bus->irq_domain) {
154 err = -ENODEV;
155 goto err_irq_domain;
156 }
157 for (gpio = 0; gpio < chip->ngpio; gpio++) {
158 int irq = irq_create_mapping(bus->irq_domain, gpio);
159
160 irq_set_chip_data(irq, bus);
161 irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
162 handle_simple_irq);
163 }
164
165 hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
166 err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
167 "gpio", bus);
168 if (err)
169 goto err_req_irq;
170
171 ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
172 chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);
173
174 return 0;
175
176 err_req_irq:
177 for (gpio = 0; gpio < chip->ngpio; gpio++) {
178 int irq = irq_find_mapping(bus->irq_domain, gpio);
179
180 irq_dispose_mapping(irq);
181 }
182 irq_domain_remove(bus->irq_domain);
183 err_irq_domain:
184 return err;
185 }
186
ssb_gpio_irq_chipco_domain_exit(struct ssb_bus * bus)187 static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
188 {
189 struct ssb_chipcommon *chipco = &bus->chipco;
190 struct gpio_chip *chip = &bus->gpio;
191 int gpio;
192
193 if (bus->bustype != SSB_BUSTYPE_SSB)
194 return;
195
196 chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
197 free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
198 for (gpio = 0; gpio < chip->ngpio; gpio++) {
199 int irq = irq_find_mapping(bus->irq_domain, gpio);
200
201 irq_dispose_mapping(irq);
202 }
203 irq_domain_remove(bus->irq_domain);
204 }
205 #else
ssb_gpio_irq_chipco_domain_init(struct ssb_bus * bus)206 static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
207 {
208 return 0;
209 }
210
ssb_gpio_irq_chipco_domain_exit(struct ssb_bus * bus)211 static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
212 {
213 }
214 #endif
215
ssb_gpio_chipco_init(struct ssb_bus * bus)216 static int ssb_gpio_chipco_init(struct ssb_bus *bus)
217 {
218 struct gpio_chip *chip = &bus->gpio;
219 int err;
220
221 chip->label = "ssb_chipco_gpio";
222 chip->owner = THIS_MODULE;
223 chip->request = ssb_gpio_chipco_request;
224 chip->free = ssb_gpio_chipco_free;
225 chip->get = ssb_gpio_chipco_get_value;
226 chip->set = ssb_gpio_chipco_set_value;
227 chip->direction_input = ssb_gpio_chipco_direction_input;
228 chip->direction_output = ssb_gpio_chipco_direction_output;
229 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
230 chip->to_irq = ssb_gpio_to_irq;
231 #endif
232 chip->ngpio = 16;
233 /* There is just one SoC in one device and its GPIO addresses should be
234 * deterministic to address them more easily. The other buses could get
235 * a random base number.
236 */
237 if (bus->bustype == SSB_BUSTYPE_SSB)
238 chip->base = 0;
239 else
240 chip->base = -1;
241
242 err = ssb_gpio_irq_chipco_domain_init(bus);
243 if (err)
244 return err;
245
246 err = gpiochip_add_data(chip, bus);
247 if (err) {
248 ssb_gpio_irq_chipco_domain_exit(bus);
249 return err;
250 }
251
252 return 0;
253 }
254
255 /**************************************************
256 * EXTIF
257 **************************************************/
258
259 #ifdef CONFIG_SSB_DRIVER_EXTIF
260
ssb_gpio_extif_get_value(struct gpio_chip * chip,unsigned int gpio)261 static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned int gpio)
262 {
263 struct ssb_bus *bus = gpiochip_get_data(chip);
264
265 return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
266 }
267
ssb_gpio_extif_set_value(struct gpio_chip * chip,unsigned int gpio,int value)268 static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned int gpio,
269 int value)
270 {
271 struct ssb_bus *bus = gpiochip_get_data(chip);
272
273 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
274 }
275
ssb_gpio_extif_direction_input(struct gpio_chip * chip,unsigned int gpio)276 static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
277 unsigned int gpio)
278 {
279 struct ssb_bus *bus = gpiochip_get_data(chip);
280
281 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
282 return 0;
283 }
284
ssb_gpio_extif_direction_output(struct gpio_chip * chip,unsigned int gpio,int value)285 static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
286 unsigned int gpio, int value)
287 {
288 struct ssb_bus *bus = gpiochip_get_data(chip);
289
290 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
291 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
292 return 0;
293 }
294
295 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
ssb_gpio_irq_extif_mask(struct irq_data * d)296 static void ssb_gpio_irq_extif_mask(struct irq_data *d)
297 {
298 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
299 int gpio = irqd_to_hwirq(d);
300
301 ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
302 }
303
ssb_gpio_irq_extif_unmask(struct irq_data * d)304 static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
305 {
306 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
307 int gpio = irqd_to_hwirq(d);
308 u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));
309
310 ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
311 ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
312 }
313
314 static struct irq_chip ssb_gpio_irq_extif_chip = {
315 .name = "SSB-GPIO-EXTIF",
316 .irq_mask = ssb_gpio_irq_extif_mask,
317 .irq_unmask = ssb_gpio_irq_extif_unmask,
318 };
319
ssb_gpio_irq_extif_handler(int irq,void * dev_id)320 static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
321 {
322 struct ssb_bus *bus = dev_id;
323 struct ssb_extif *extif = &bus->extif;
324 u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
325 u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
326 u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
327 unsigned long irqs = (val ^ pol) & mask;
328 int gpio;
329
330 if (!irqs)
331 return IRQ_NONE;
332
333 for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
334 generic_handle_domain_irq_safe(bus->irq_domain, gpio);
335
336 ssb_extif_gpio_polarity(extif, irqs, val & irqs);
337
338 return IRQ_HANDLED;
339 }
340
ssb_gpio_irq_extif_domain_init(struct ssb_bus * bus)341 static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
342 {
343 struct ssb_extif *extif = &bus->extif;
344 struct gpio_chip *chip = &bus->gpio;
345 int gpio, hwirq, err;
346
347 if (bus->bustype != SSB_BUSTYPE_SSB)
348 return 0;
349
350 bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
351 &irq_domain_simple_ops, extif);
352 if (!bus->irq_domain) {
353 err = -ENODEV;
354 goto err_irq_domain;
355 }
356 for (gpio = 0; gpio < chip->ngpio; gpio++) {
357 int irq = irq_create_mapping(bus->irq_domain, gpio);
358
359 irq_set_chip_data(irq, bus);
360 irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
361 handle_simple_irq);
362 }
363
364 hwirq = ssb_mips_irq(bus->extif.dev) + 2;
365 err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
366 "gpio", bus);
367 if (err)
368 goto err_req_irq;
369
370 ssb_extif_gpio_intmask(&bus->extif, ~0, 0);
371
372 return 0;
373
374 err_req_irq:
375 for (gpio = 0; gpio < chip->ngpio; gpio++) {
376 int irq = irq_find_mapping(bus->irq_domain, gpio);
377
378 irq_dispose_mapping(irq);
379 }
380 irq_domain_remove(bus->irq_domain);
381 err_irq_domain:
382 return err;
383 }
384
ssb_gpio_irq_extif_domain_exit(struct ssb_bus * bus)385 static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
386 {
387 struct ssb_extif *extif = &bus->extif;
388 struct gpio_chip *chip = &bus->gpio;
389 int gpio;
390
391 if (bus->bustype != SSB_BUSTYPE_SSB)
392 return;
393
394 free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
395 for (gpio = 0; gpio < chip->ngpio; gpio++) {
396 int irq = irq_find_mapping(bus->irq_domain, gpio);
397
398 irq_dispose_mapping(irq);
399 }
400 irq_domain_remove(bus->irq_domain);
401 }
402 #else
ssb_gpio_irq_extif_domain_init(struct ssb_bus * bus)403 static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
404 {
405 return 0;
406 }
407
ssb_gpio_irq_extif_domain_exit(struct ssb_bus * bus)408 static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
409 {
410 }
411 #endif
412
ssb_gpio_extif_init(struct ssb_bus * bus)413 static int ssb_gpio_extif_init(struct ssb_bus *bus)
414 {
415 struct gpio_chip *chip = &bus->gpio;
416 int err;
417
418 chip->label = "ssb_extif_gpio";
419 chip->owner = THIS_MODULE;
420 chip->get = ssb_gpio_extif_get_value;
421 chip->set = ssb_gpio_extif_set_value;
422 chip->direction_input = ssb_gpio_extif_direction_input;
423 chip->direction_output = ssb_gpio_extif_direction_output;
424 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
425 chip->to_irq = ssb_gpio_to_irq;
426 #endif
427 chip->ngpio = 5;
428 /* There is just one SoC in one device and its GPIO addresses should be
429 * deterministic to address them more easily. The other buses could get
430 * a random base number.
431 */
432 if (bus->bustype == SSB_BUSTYPE_SSB)
433 chip->base = 0;
434 else
435 chip->base = -1;
436
437 err = ssb_gpio_irq_extif_domain_init(bus);
438 if (err)
439 return err;
440
441 err = gpiochip_add_data(chip, bus);
442 if (err) {
443 ssb_gpio_irq_extif_domain_exit(bus);
444 return err;
445 }
446
447 return 0;
448 }
449
450 #else
ssb_gpio_extif_init(struct ssb_bus * bus)451 static int ssb_gpio_extif_init(struct ssb_bus *bus)
452 {
453 return -ENOTSUPP;
454 }
455 #endif
456
457 /**************************************************
458 * Init
459 **************************************************/
460
ssb_gpio_init(struct ssb_bus * bus)461 int ssb_gpio_init(struct ssb_bus *bus)
462 {
463 if (ssb_chipco_available(&bus->chipco))
464 return ssb_gpio_chipco_init(bus);
465 else if (ssb_extif_available(&bus->extif))
466 return ssb_gpio_extif_init(bus);
467 return -1;
468 }
469
ssb_gpio_unregister(struct ssb_bus * bus)470 int ssb_gpio_unregister(struct ssb_bus *bus)
471 {
472 if (ssb_chipco_available(&bus->chipco) ||
473 ssb_extif_available(&bus->extif)) {
474 gpiochip_remove(&bus->gpio);
475 return 0;
476 }
477 return -1;
478 }
479