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_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
136 ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);
137
138 return IRQ_HANDLED;
139 }
140
ssb_gpio_irq_chipco_domain_init(struct ssb_bus * bus)141 static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
142 {
143 struct ssb_chipcommon *chipco = &bus->chipco;
144 struct gpio_chip *chip = &bus->gpio;
145 int gpio, hwirq, err;
146
147 if (bus->bustype != SSB_BUSTYPE_SSB)
148 return 0;
149
150 bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
151 &irq_domain_simple_ops, chipco);
152 if (!bus->irq_domain) {
153 err = -ENODEV;
154 goto err_irq_domain;
155 }
156 for (gpio = 0; gpio < chip->ngpio; gpio++) {
157 int irq = irq_create_mapping(bus->irq_domain, gpio);
158
159 irq_set_chip_data(irq, bus);
160 irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
161 handle_simple_irq);
162 }
163
164 hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
165 err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
166 "gpio", bus);
167 if (err)
168 goto err_req_irq;
169
170 ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
171 chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);
172
173 return 0;
174
175 err_req_irq:
176 for (gpio = 0; gpio < chip->ngpio; gpio++) {
177 int irq = irq_find_mapping(bus->irq_domain, gpio);
178
179 irq_dispose_mapping(irq);
180 }
181 irq_domain_remove(bus->irq_domain);
182 err_irq_domain:
183 return err;
184 }
185
ssb_gpio_irq_chipco_domain_exit(struct ssb_bus * bus)186 static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
187 {
188 struct ssb_chipcommon *chipco = &bus->chipco;
189 struct gpio_chip *chip = &bus->gpio;
190 int gpio;
191
192 if (bus->bustype != SSB_BUSTYPE_SSB)
193 return;
194
195 chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
196 free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
197 for (gpio = 0; gpio < chip->ngpio; gpio++) {
198 int irq = irq_find_mapping(bus->irq_domain, gpio);
199
200 irq_dispose_mapping(irq);
201 }
202 irq_domain_remove(bus->irq_domain);
203 }
204 #else
ssb_gpio_irq_chipco_domain_init(struct ssb_bus * bus)205 static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
206 {
207 return 0;
208 }
209
ssb_gpio_irq_chipco_domain_exit(struct ssb_bus * bus)210 static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
211 {
212 }
213 #endif
214
ssb_gpio_chipco_init(struct ssb_bus * bus)215 static int ssb_gpio_chipco_init(struct ssb_bus *bus)
216 {
217 struct gpio_chip *chip = &bus->gpio;
218 int err;
219
220 chip->label = "ssb_chipco_gpio";
221 chip->owner = THIS_MODULE;
222 chip->request = ssb_gpio_chipco_request;
223 chip->free = ssb_gpio_chipco_free;
224 chip->get = ssb_gpio_chipco_get_value;
225 chip->set = ssb_gpio_chipco_set_value;
226 chip->direction_input = ssb_gpio_chipco_direction_input;
227 chip->direction_output = ssb_gpio_chipco_direction_output;
228 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
229 chip->to_irq = ssb_gpio_to_irq;
230 #endif
231 chip->ngpio = 16;
232 /* There is just one SoC in one device and its GPIO addresses should be
233 * deterministic to address them more easily. The other buses could get
234 * a random base number. */
235 if (bus->bustype == SSB_BUSTYPE_SSB)
236 chip->base = 0;
237 else
238 chip->base = -1;
239
240 err = ssb_gpio_irq_chipco_domain_init(bus);
241 if (err)
242 return err;
243
244 err = gpiochip_add_data(chip, bus);
245 if (err) {
246 ssb_gpio_irq_chipco_domain_exit(bus);
247 return err;
248 }
249
250 return 0;
251 }
252
253 /**************************************************
254 * EXTIF
255 **************************************************/
256
257 #ifdef CONFIG_SSB_DRIVER_EXTIF
258
ssb_gpio_extif_get_value(struct gpio_chip * chip,unsigned int gpio)259 static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned int gpio)
260 {
261 struct ssb_bus *bus = gpiochip_get_data(chip);
262
263 return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
264 }
265
ssb_gpio_extif_set_value(struct gpio_chip * chip,unsigned int gpio,int value)266 static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned int gpio,
267 int value)
268 {
269 struct ssb_bus *bus = gpiochip_get_data(chip);
270
271 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
272 }
273
ssb_gpio_extif_direction_input(struct gpio_chip * chip,unsigned int gpio)274 static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
275 unsigned int gpio)
276 {
277 struct ssb_bus *bus = gpiochip_get_data(chip);
278
279 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
280 return 0;
281 }
282
ssb_gpio_extif_direction_output(struct gpio_chip * chip,unsigned int gpio,int value)283 static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
284 unsigned int gpio, int value)
285 {
286 struct ssb_bus *bus = gpiochip_get_data(chip);
287
288 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
289 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
290 return 0;
291 }
292
293 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
ssb_gpio_irq_extif_mask(struct irq_data * d)294 static void ssb_gpio_irq_extif_mask(struct irq_data *d)
295 {
296 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
297 int gpio = irqd_to_hwirq(d);
298
299 ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
300 }
301
ssb_gpio_irq_extif_unmask(struct irq_data * d)302 static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
303 {
304 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
305 int gpio = irqd_to_hwirq(d);
306 u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));
307
308 ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
309 ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
310 }
311
312 static struct irq_chip ssb_gpio_irq_extif_chip = {
313 .name = "SSB-GPIO-EXTIF",
314 .irq_mask = ssb_gpio_irq_extif_mask,
315 .irq_unmask = ssb_gpio_irq_extif_unmask,
316 };
317
ssb_gpio_irq_extif_handler(int irq,void * dev_id)318 static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
319 {
320 struct ssb_bus *bus = dev_id;
321 struct ssb_extif *extif = &bus->extif;
322 u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
323 u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
324 u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
325 unsigned long irqs = (val ^ pol) & mask;
326 int gpio;
327
328 if (!irqs)
329 return IRQ_NONE;
330
331 for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
332 generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
333 ssb_extif_gpio_polarity(extif, irqs, val & irqs);
334
335 return IRQ_HANDLED;
336 }
337
ssb_gpio_irq_extif_domain_init(struct ssb_bus * bus)338 static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
339 {
340 struct ssb_extif *extif = &bus->extif;
341 struct gpio_chip *chip = &bus->gpio;
342 int gpio, hwirq, err;
343
344 if (bus->bustype != SSB_BUSTYPE_SSB)
345 return 0;
346
347 bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
348 &irq_domain_simple_ops, extif);
349 if (!bus->irq_domain) {
350 err = -ENODEV;
351 goto err_irq_domain;
352 }
353 for (gpio = 0; gpio < chip->ngpio; gpio++) {
354 int irq = irq_create_mapping(bus->irq_domain, gpio);
355
356 irq_set_chip_data(irq, bus);
357 irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
358 handle_simple_irq);
359 }
360
361 hwirq = ssb_mips_irq(bus->extif.dev) + 2;
362 err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
363 "gpio", bus);
364 if (err)
365 goto err_req_irq;
366
367 ssb_extif_gpio_intmask(&bus->extif, ~0, 0);
368
369 return 0;
370
371 err_req_irq:
372 for (gpio = 0; gpio < chip->ngpio; gpio++) {
373 int irq = irq_find_mapping(bus->irq_domain, gpio);
374
375 irq_dispose_mapping(irq);
376 }
377 irq_domain_remove(bus->irq_domain);
378 err_irq_domain:
379 return err;
380 }
381
ssb_gpio_irq_extif_domain_exit(struct ssb_bus * bus)382 static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
383 {
384 struct ssb_extif *extif = &bus->extif;
385 struct gpio_chip *chip = &bus->gpio;
386 int gpio;
387
388 if (bus->bustype != SSB_BUSTYPE_SSB)
389 return;
390
391 free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
392 for (gpio = 0; gpio < chip->ngpio; gpio++) {
393 int irq = irq_find_mapping(bus->irq_domain, gpio);
394
395 irq_dispose_mapping(irq);
396 }
397 irq_domain_remove(bus->irq_domain);
398 }
399 #else
ssb_gpio_irq_extif_domain_init(struct ssb_bus * bus)400 static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
401 {
402 return 0;
403 }
404
ssb_gpio_irq_extif_domain_exit(struct ssb_bus * bus)405 static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
406 {
407 }
408 #endif
409
ssb_gpio_extif_init(struct ssb_bus * bus)410 static int ssb_gpio_extif_init(struct ssb_bus *bus)
411 {
412 struct gpio_chip *chip = &bus->gpio;
413 int err;
414
415 chip->label = "ssb_extif_gpio";
416 chip->owner = THIS_MODULE;
417 chip->get = ssb_gpio_extif_get_value;
418 chip->set = ssb_gpio_extif_set_value;
419 chip->direction_input = ssb_gpio_extif_direction_input;
420 chip->direction_output = ssb_gpio_extif_direction_output;
421 #if IS_ENABLED(CONFIG_SSB_EMBEDDED)
422 chip->to_irq = ssb_gpio_to_irq;
423 #endif
424 chip->ngpio = 5;
425 /* There is just one SoC in one device and its GPIO addresses should be
426 * deterministic to address them more easily. The other buses could get
427 * a random base number. */
428 if (bus->bustype == SSB_BUSTYPE_SSB)
429 chip->base = 0;
430 else
431 chip->base = -1;
432
433 err = ssb_gpio_irq_extif_domain_init(bus);
434 if (err)
435 return err;
436
437 err = gpiochip_add_data(chip, bus);
438 if (err) {
439 ssb_gpio_irq_extif_domain_exit(bus);
440 return err;
441 }
442
443 return 0;
444 }
445
446 #else
ssb_gpio_extif_init(struct ssb_bus * bus)447 static int ssb_gpio_extif_init(struct ssb_bus *bus)
448 {
449 return -ENOTSUPP;
450 }
451 #endif
452
453 /**************************************************
454 * Init
455 **************************************************/
456
ssb_gpio_init(struct ssb_bus * bus)457 int ssb_gpio_init(struct ssb_bus *bus)
458 {
459 if (ssb_chipco_available(&bus->chipco))
460 return ssb_gpio_chipco_init(bus);
461 else if (ssb_extif_available(&bus->extif))
462 return ssb_gpio_extif_init(bus);
463 return -1;
464 }
465
ssb_gpio_unregister(struct ssb_bus * bus)466 int ssb_gpio_unregister(struct ssb_bus *bus)
467 {
468 if (ssb_chipco_available(&bus->chipco) ||
469 ssb_extif_available(&bus->extif)) {
470 gpiochip_remove(&bus->gpio);
471 return 0;
472 }
473 return -1;
474 }
475