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Hauke Mehrtensec43b082012-11-20 22:24:33 +00001/*
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 <linux/gpio.h>
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +010012#include <linux/irq.h>
13#include <linux/interrupt.h>
14#include <linux/irqdomain.h>
Hauke Mehrtensec43b082012-11-20 22:24:33 +000015#include <linux/export.h>
16#include <linux/ssb/ssb.h>
17
18#include "ssb_private.h"
19
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +010020
21/**************************************************
22 * Shared
23 **************************************************/
24
Hauke Mehrtensec43b082012-11-20 22:24:33 +000025static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip)
26{
27 return container_of(chip, struct ssb_bus, gpio);
28}
29
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +010030#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
31static int ssb_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
32{
33 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
34
35 if (bus->bustype == SSB_BUSTYPE_SSB)
36 return irq_find_mapping(bus->irq_domain, gpio);
37 else
38 return -EINVAL;
39}
40#endif
41
42/**************************************************
43 * ChipCommon
44 **************************************************/
45
Hauke Mehrtensec43b082012-11-20 22:24:33 +000046static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio)
47{
48 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
49
50 return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio);
51}
52
53static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio,
54 int value)
55{
56 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
57
58 ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
59}
60
61static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip,
62 unsigned gpio)
63{
64 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
65
66 ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0);
67 return 0;
68}
69
70static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip,
71 unsigned gpio, int value)
72{
73 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
74
75 ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio);
76 ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0);
77 return 0;
78}
79
80static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio)
81{
82 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
83
84 ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0);
85 /* clear pulldown */
86 ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0);
87 /* Set pullup */
88 ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio);
89
90 return 0;
91}
92
93static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio)
94{
95 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
96
97 /* clear pullup */
98 ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0);
99}
100
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100101#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
102static void ssb_gpio_irq_chipco_mask(struct irq_data *d)
Hauke Mehrtensa6ca2e12013-01-26 21:38:35 +0100103{
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100104 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
105 int gpio = irqd_to_hwirq(d);
Hauke Mehrtensa6ca2e12013-01-26 21:38:35 +0100106
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100107 ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), 0);
Hauke Mehrtensa6ca2e12013-01-26 21:38:35 +0100108}
109
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100110static void ssb_gpio_irq_chipco_unmask(struct irq_data *d)
111{
112 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
113 int gpio = irqd_to_hwirq(d);
114 u32 val = ssb_chipco_gpio_in(&bus->chipco, BIT(gpio));
115
116 ssb_chipco_gpio_polarity(&bus->chipco, BIT(gpio), val);
117 ssb_chipco_gpio_intmask(&bus->chipco, BIT(gpio), BIT(gpio));
118}
119
120static struct irq_chip ssb_gpio_irq_chipco_chip = {
121 .name = "SSB-GPIO-CC",
122 .irq_mask = ssb_gpio_irq_chipco_mask,
123 .irq_unmask = ssb_gpio_irq_chipco_unmask,
124};
125
126static irqreturn_t ssb_gpio_irq_chipco_handler(int irq, void *dev_id)
127{
128 struct ssb_bus *bus = dev_id;
129 struct ssb_chipcommon *chipco = &bus->chipco;
130 u32 val = chipco_read32(chipco, SSB_CHIPCO_GPIOIN);
131 u32 mask = chipco_read32(chipco, SSB_CHIPCO_GPIOIRQ);
132 u32 pol = chipco_read32(chipco, SSB_CHIPCO_GPIOPOL);
133 unsigned long irqs = (val ^ pol) & mask;
134 int gpio;
135
136 if (!irqs)
137 return IRQ_NONE;
138
139 for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
140 generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
141 ssb_chipco_gpio_polarity(chipco, irqs, val & irqs);
142
143 return IRQ_HANDLED;
144}
145
146static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
147{
148 struct ssb_chipcommon *chipco = &bus->chipco;
149 struct gpio_chip *chip = &bus->gpio;
150 int gpio, hwirq, err;
151
152 if (bus->bustype != SSB_BUSTYPE_SSB)
153 return 0;
154
155 bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
156 &irq_domain_simple_ops, chipco);
157 if (!bus->irq_domain) {
158 err = -ENODEV;
159 goto err_irq_domain;
160 }
161 for (gpio = 0; gpio < chip->ngpio; gpio++) {
162 int irq = irq_create_mapping(bus->irq_domain, gpio);
163
164 irq_set_chip_data(irq, bus);
165 irq_set_chip_and_handler(irq, &ssb_gpio_irq_chipco_chip,
166 handle_simple_irq);
167 }
168
169 hwirq = ssb_mips_irq(bus->chipco.dev) + 2;
170 err = request_irq(hwirq, ssb_gpio_irq_chipco_handler, IRQF_SHARED,
171 "gpio", bus);
172 if (err)
173 goto err_req_irq;
174
175 ssb_chipco_gpio_intmask(&bus->chipco, ~0, 0);
176 chipco_set32(chipco, SSB_CHIPCO_IRQMASK, SSB_CHIPCO_IRQ_GPIO);
177
178 return 0;
179
180err_req_irq:
181 for (gpio = 0; gpio < chip->ngpio; gpio++) {
182 int irq = irq_find_mapping(bus->irq_domain, gpio);
183
184 irq_dispose_mapping(irq);
185 }
186 irq_domain_remove(bus->irq_domain);
187err_irq_domain:
188 return err;
189}
190
191static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
192{
193 struct ssb_chipcommon *chipco = &bus->chipco;
194 struct gpio_chip *chip = &bus->gpio;
195 int gpio;
196
197 if (bus->bustype != SSB_BUSTYPE_SSB)
198 return;
199
200 chipco_mask32(chipco, SSB_CHIPCO_IRQMASK, ~SSB_CHIPCO_IRQ_GPIO);
201 free_irq(ssb_mips_irq(bus->chipco.dev) + 2, chipco);
202 for (gpio = 0; gpio < chip->ngpio; gpio++) {
203 int irq = irq_find_mapping(bus->irq_domain, gpio);
204
205 irq_dispose_mapping(irq);
206 }
207 irq_domain_remove(bus->irq_domain);
208}
209#else
210static int ssb_gpio_irq_chipco_domain_init(struct ssb_bus *bus)
211{
212 return 0;
213}
214
215static void ssb_gpio_irq_chipco_domain_exit(struct ssb_bus *bus)
216{
217}
218#endif
219
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000220static int ssb_gpio_chipco_init(struct ssb_bus *bus)
221{
222 struct gpio_chip *chip = &bus->gpio;
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100223 int err;
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000224
225 chip->label = "ssb_chipco_gpio";
226 chip->owner = THIS_MODULE;
227 chip->request = ssb_gpio_chipco_request;
228 chip->free = ssb_gpio_chipco_free;
229 chip->get = ssb_gpio_chipco_get_value;
230 chip->set = ssb_gpio_chipco_set_value;
231 chip->direction_input = ssb_gpio_chipco_direction_input;
232 chip->direction_output = ssb_gpio_chipco_direction_output;
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100233#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
234 chip->to_irq = ssb_gpio_to_irq;
235#endif
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000236 chip->ngpio = 16;
237 /* There is just one SoC in one device and its GPIO addresses should be
238 * deterministic to address them more easily. The other buses could get
239 * a random base number. */
240 if (bus->bustype == SSB_BUSTYPE_SSB)
241 chip->base = 0;
242 else
243 chip->base = -1;
244
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100245 err = ssb_gpio_irq_chipco_domain_init(bus);
246 if (err)
247 return err;
248
249 err = gpiochip_add(chip);
250 if (err) {
251 ssb_gpio_irq_chipco_domain_exit(bus);
252 return err;
253 }
254
255 return 0;
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000256}
257
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100258/**************************************************
259 * EXTIF
260 **************************************************/
261
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000262#ifdef CONFIG_SSB_DRIVER_EXTIF
263
264static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio)
265{
266 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
267
268 return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio);
269}
270
271static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio,
272 int value)
273{
274 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
275
276 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
277}
278
279static int ssb_gpio_extif_direction_input(struct gpio_chip *chip,
280 unsigned gpio)
281{
282 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
283
284 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0);
285 return 0;
286}
287
288static int ssb_gpio_extif_direction_output(struct gpio_chip *chip,
289 unsigned gpio, int value)
290{
291 struct ssb_bus *bus = ssb_gpio_get_bus(chip);
292
293 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio);
294 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0);
295 return 0;
296}
297
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100298#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
299static void ssb_gpio_irq_extif_mask(struct irq_data *d)
Hauke Mehrtensa6ca2e12013-01-26 21:38:35 +0100300{
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100301 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
302 int gpio = irqd_to_hwirq(d);
Hauke Mehrtensa6ca2e12013-01-26 21:38:35 +0100303
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100304 ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), 0);
Hauke Mehrtensa6ca2e12013-01-26 21:38:35 +0100305}
306
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100307static void ssb_gpio_irq_extif_unmask(struct irq_data *d)
308{
309 struct ssb_bus *bus = irq_data_get_irq_chip_data(d);
310 int gpio = irqd_to_hwirq(d);
311 u32 val = ssb_extif_gpio_in(&bus->extif, BIT(gpio));
312
313 ssb_extif_gpio_polarity(&bus->extif, BIT(gpio), val);
314 ssb_extif_gpio_intmask(&bus->extif, BIT(gpio), BIT(gpio));
315}
316
317static struct irq_chip ssb_gpio_irq_extif_chip = {
318 .name = "SSB-GPIO-EXTIF",
319 .irq_mask = ssb_gpio_irq_extif_mask,
320 .irq_unmask = ssb_gpio_irq_extif_unmask,
321};
322
323static irqreturn_t ssb_gpio_irq_extif_handler(int irq, void *dev_id)
324{
325 struct ssb_bus *bus = dev_id;
326 struct ssb_extif *extif = &bus->extif;
327 u32 val = ssb_read32(extif->dev, SSB_EXTIF_GPIO_IN);
328 u32 mask = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTMASK);
329 u32 pol = ssb_read32(extif->dev, SSB_EXTIF_GPIO_INTPOL);
330 unsigned long irqs = (val ^ pol) & mask;
331 int gpio;
332
333 if (!irqs)
334 return IRQ_NONE;
335
336 for_each_set_bit(gpio, &irqs, bus->gpio.ngpio)
337 generic_handle_irq(ssb_gpio_to_irq(&bus->gpio, gpio));
338 ssb_extif_gpio_polarity(extif, irqs, val & irqs);
339
340 return IRQ_HANDLED;
341}
342
343static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
344{
345 struct ssb_extif *extif = &bus->extif;
346 struct gpio_chip *chip = &bus->gpio;
347 int gpio, hwirq, err;
348
349 if (bus->bustype != SSB_BUSTYPE_SSB)
350 return 0;
351
352 bus->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
353 &irq_domain_simple_ops, extif);
354 if (!bus->irq_domain) {
355 err = -ENODEV;
356 goto err_irq_domain;
357 }
358 for (gpio = 0; gpio < chip->ngpio; gpio++) {
359 int irq = irq_create_mapping(bus->irq_domain, gpio);
360
361 irq_set_chip_data(irq, bus);
362 irq_set_chip_and_handler(irq, &ssb_gpio_irq_extif_chip,
363 handle_simple_irq);
364 }
365
366 hwirq = ssb_mips_irq(bus->extif.dev) + 2;
367 err = request_irq(hwirq, ssb_gpio_irq_extif_handler, IRQF_SHARED,
368 "gpio", bus);
369 if (err)
370 goto err_req_irq;
371
372 ssb_extif_gpio_intmask(&bus->extif, ~0, 0);
373
374 return 0;
375
376err_req_irq:
377 for (gpio = 0; gpio < chip->ngpio; gpio++) {
378 int irq = irq_find_mapping(bus->irq_domain, gpio);
379
380 irq_dispose_mapping(irq);
381 }
382 irq_domain_remove(bus->irq_domain);
383err_irq_domain:
384 return err;
385}
386
387static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
388{
389 struct ssb_extif *extif = &bus->extif;
390 struct gpio_chip *chip = &bus->gpio;
391 int gpio;
392
393 if (bus->bustype != SSB_BUSTYPE_SSB)
394 return;
395
396 free_irq(ssb_mips_irq(bus->extif.dev) + 2, extif);
397 for (gpio = 0; gpio < chip->ngpio; gpio++) {
398 int irq = irq_find_mapping(bus->irq_domain, gpio);
399
400 irq_dispose_mapping(irq);
401 }
402 irq_domain_remove(bus->irq_domain);
403}
404#else
405static int ssb_gpio_irq_extif_domain_init(struct ssb_bus *bus)
406{
407 return 0;
408}
409
410static void ssb_gpio_irq_extif_domain_exit(struct ssb_bus *bus)
411{
412}
413#endif
414
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000415static int ssb_gpio_extif_init(struct ssb_bus *bus)
416{
417 struct gpio_chip *chip = &bus->gpio;
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100418 int err;
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000419
420 chip->label = "ssb_extif_gpio";
421 chip->owner = THIS_MODULE;
422 chip->get = ssb_gpio_extif_get_value;
423 chip->set = ssb_gpio_extif_set_value;
424 chip->direction_input = ssb_gpio_extif_direction_input;
425 chip->direction_output = ssb_gpio_extif_direction_output;
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100426#if IS_ENABLED(CONFIG_SSB_EMBEDDED)
427 chip->to_irq = ssb_gpio_to_irq;
428#endif
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000429 chip->ngpio = 5;
430 /* There is just one SoC in one device and its GPIO addresses should be
431 * deterministic to address them more easily. The other buses could get
432 * a random base number. */
433 if (bus->bustype == SSB_BUSTYPE_SSB)
434 chip->base = 0;
435 else
436 chip->base = -1;
437
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100438 err = ssb_gpio_irq_extif_domain_init(bus);
439 if (err)
440 return err;
441
442 err = gpiochip_add(chip);
443 if (err) {
444 ssb_gpio_irq_extif_domain_exit(bus);
445 return err;
446 }
447
448 return 0;
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000449}
450
451#else
452static int ssb_gpio_extif_init(struct ssb_bus *bus)
453{
454 return -ENOTSUPP;
455}
456#endif
457
Rafał Miłecki7c1bc0d2014-01-13 19:56:08 +0100458/**************************************************
459 * Init
460 **************************************************/
461
Hauke Mehrtensec43b082012-11-20 22:24:33 +0000462int ssb_gpio_init(struct ssb_bus *bus)
463{
464 if (ssb_chipco_available(&bus->chipco))
465 return ssb_gpio_chipco_init(bus);
466 else if (ssb_extif_available(&bus->extif))
467 return ssb_gpio_extif_init(bus);
468 else
469 SSB_WARN_ON(1);
470
471 return -1;
472}
Hauke Mehrtens600485e2013-02-03 23:25:34 +0100473
474int ssb_gpio_unregister(struct ssb_bus *bus)
475{
476 if (ssb_chipco_available(&bus->chipco) ||
477 ssb_extif_available(&bus->extif)) {
478 return gpiochip_remove(&bus->gpio);
479 } else {
480 SSB_WARN_ON(1);
481 }
482
483 return -1;
484}