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Linux 4.1.16
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-amd.c
blob7de3b64bf1428982572fd981e1cb28a04669ba80
1 /*
2 * GPIO driver for AMD
3 *
4 * Copyright (c) 2014,2015 AMD Corporation.
5 * Authors: Ken Xue <Ken.Xue@amd.com>
6 * Wu, Jeff <Jeff.Wu@amd.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 */
12
13 #include <linux/err.h>
14 #include <linux/bug.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/spinlock.h>
18 #include <linux/compiler.h>
19 #include <linux/types.h>
20 #include <linux/errno.h>
21 #include <linux/log2.h>
22 #include <linux/io.h>
23 #include <linux/gpio.h>
24 #include <linux/slab.h>
25 #include <linux/platform_device.h>
26 #include <linux/mutex.h>
27 #include <linux/acpi.h>
28 #include <linux/seq_file.h>
29 #include <linux/interrupt.h>
30 #include <linux/list.h>
31 #include <linux/bitops.h>
32 #include <linux/pinctrl/pinconf.h>
33 #include <linux/pinctrl/pinconf-generic.h>
34
35 #include "pinctrl-utils.h"
36 #include "pinctrl-amd.h"
37
38 static inline struct amd_gpio *to_amd_gpio(struct gpio_chip *gc)
39 {
40 return container_of(gc, struct amd_gpio, gc);
41 }
42
43 static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
44 {
45 unsigned long flags;
46 u32 pin_reg;
47 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
48
49 spin_lock_irqsave(&gpio_dev->lock, flags);
50 pin_reg = readl(gpio_dev->base + offset * 4);
51 /*
52 * Suppose BIOS or Bootloader sets specific debounce for the
53 * GPIO. if not, set debounce to be 2.75ms and remove glitch.
54 */
55 if ((pin_reg & DB_TMR_OUT_MASK) == 0) {
56 pin_reg |= 0xf;
57 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
58 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
59 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
60 }
61
62 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
63 writel(pin_reg, gpio_dev->base + offset * 4);
64 spin_unlock_irqrestore(&gpio_dev->lock, flags);
65
66 return 0;
67 }
68
69 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
70 int value)
71 {
72 u32 pin_reg;
73 unsigned long flags;
74 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
75
76 spin_lock_irqsave(&gpio_dev->lock, flags);
77 pin_reg = readl(gpio_dev->base + offset * 4);
78 pin_reg |= BIT(OUTPUT_ENABLE_OFF);
79 if (value)
80 pin_reg |= BIT(OUTPUT_VALUE_OFF);
81 else
82 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
83 writel(pin_reg, gpio_dev->base + offset * 4);
84 spin_unlock_irqrestore(&gpio_dev->lock, flags);
85
86 return 0;
87 }
88
89 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
90 {
91 u32 pin_reg;
92 unsigned long flags;
93 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
94
95 spin_lock_irqsave(&gpio_dev->lock, flags);
96 pin_reg = readl(gpio_dev->base + offset * 4);
97 spin_unlock_irqrestore(&gpio_dev->lock, flags);
98
99 return !!(pin_reg & BIT(PIN_STS_OFF));
100 }
101
102 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
103 {
104 u32 pin_reg;
105 unsigned long flags;
106 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
107
108 spin_lock_irqsave(&gpio_dev->lock, flags);
109 pin_reg = readl(gpio_dev->base + offset * 4);
110 if (value)
111 pin_reg |= BIT(OUTPUT_VALUE_OFF);
112 else
113 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
114 writel(pin_reg, gpio_dev->base + offset * 4);
115 spin_unlock_irqrestore(&gpio_dev->lock, flags);
116 }
117
118 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
119 unsigned debounce)
120 {
121 u32 time;
122 u32 pin_reg;
123 int ret = 0;
124 unsigned long flags;
125 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
126
127 spin_lock_irqsave(&gpio_dev->lock, flags);
128 pin_reg = readl(gpio_dev->base + offset * 4);
129
130 if (debounce) {
131 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
132 pin_reg &= ~DB_TMR_OUT_MASK;
133 /*
134 Debounce Debounce Timer Max
135 TmrLarge TmrOutUnit Unit Debounce
136 Time
137 0 0 61 usec (2 RtcClk) 976 usec
138 0 1 244 usec (8 RtcClk) 3.9 msec
139 1 0 15.6 msec (512 RtcClk) 250 msec
140 1 1 62.5 msec (2048 RtcClk) 1 sec
141 */
142
143 if (debounce < 61) {
144 pin_reg |= 1;
145 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
146 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
147 } else if (debounce < 976) {
148 time = debounce / 61;
149 pin_reg |= time & DB_TMR_OUT_MASK;
150 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
151 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
152 } else if (debounce < 3900) {
153 time = debounce / 244;
154 pin_reg |= time & DB_TMR_OUT_MASK;
155 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
156 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
157 } else if (debounce < 250000) {
158 time = debounce / 15600;
159 pin_reg |= time & DB_TMR_OUT_MASK;
160 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
161 pin_reg |= BIT(DB_TMR_LARGE_OFF);
162 } else if (debounce < 1000000) {
163 time = debounce / 62500;
164 pin_reg |= time & DB_TMR_OUT_MASK;
165 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
166 pin_reg |= BIT(DB_TMR_LARGE_OFF);
167 } else {
168 pin_reg &= ~DB_CNTRl_MASK;
169 ret = -EINVAL;
170 }
171 } else {
172 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
173 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
174 pin_reg &= ~DB_TMR_OUT_MASK;
175 pin_reg &= ~DB_CNTRl_MASK;
176 }
177 writel(pin_reg, gpio_dev->base + offset * 4);
178 spin_unlock_irqrestore(&gpio_dev->lock, flags);
179
180 return ret;
181 }
182
183 #ifdef CONFIG_DEBUG_FS
184 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
185 {
186 u32 pin_reg;
187 unsigned long flags;
188 unsigned int bank, i, pin_num;
189 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
190
191 char *level_trig;
192 char *active_level;
193 char *interrupt_enable;
194 char *interrupt_mask;
195 char *wake_cntrl0;
196 char *wake_cntrl1;
197 char *wake_cntrl2;
198 char *pin_sts;
199 char *pull_up_sel;
200 char *pull_up_enable;
201 char *pull_down_enable;
202 char *output_value;
203 char *output_enable;
204
205 for (bank = 0; bank < AMD_GPIO_TOTAL_BANKS; bank++) {
206 seq_printf(s, "GPIO bank%d\t", bank);
207
208 switch (bank) {
209 case 0:
210 i = 0;
211 pin_num = AMD_GPIO_PINS_BANK0;
212 break;
213 case 1:
214 i = 64;
215 pin_num = AMD_GPIO_PINS_BANK1 + i;
216 break;
217 case 2:
218 i = 128;
219 pin_num = AMD_GPIO_PINS_BANK2 + i;
220 break;
221 }
222
223 for (; i < pin_num; i++) {
224 seq_printf(s, "pin%d\t", i);
225 spin_lock_irqsave(&gpio_dev->lock, flags);
226 pin_reg = readl(gpio_dev->base + i * 4);
227 spin_unlock_irqrestore(&gpio_dev->lock, flags);
228
229 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
230 interrupt_enable = "interrupt is enabled|";
231
232 if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF))
233 && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1)))
234 active_level = "Active low|";
235 else if (pin_reg & BIT(ACTIVE_LEVEL_OFF)
236 && !(pin_reg & BIT(ACTIVE_LEVEL_OFF+1)))
237 active_level = "Active high|";
238 else if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF))
239 && pin_reg & BIT(ACTIVE_LEVEL_OFF+1))
240 active_level = "Active on both|";
241 else
242 active_level = "Unknow Active level|";
243
244 if (pin_reg & BIT(LEVEL_TRIG_OFF))
245 level_trig = "Level trigger|";
246 else
247 level_trig = "Edge trigger|";
248
249 } else {
250 interrupt_enable =
251 "interrupt is disabled|";
252 active_level = " ";
253 level_trig = " ";
254 }
255
256 if (pin_reg & BIT(INTERRUPT_MASK_OFF))
257 interrupt_mask =
258 "interrupt is unmasked|";
259 else
260 interrupt_mask =
261 "interrupt is masked|";
262
263 if (pin_reg & BIT(WAKE_CNTRL_OFF))
264 wake_cntrl0 = "enable wakeup in S0i3 state|";
265 else
266 wake_cntrl0 = "disable wakeup in S0i3 state|";
267
268 if (pin_reg & BIT(WAKE_CNTRL_OFF))
269 wake_cntrl1 = "enable wakeup in S3 state|";
270 else
271 wake_cntrl1 = "disable wakeup in S3 state|";
272
273 if (pin_reg & BIT(WAKE_CNTRL_OFF))
274 wake_cntrl2 = "enable wakeup in S4/S5 state|";
275 else
276 wake_cntrl2 = "disable wakeup in S4/S5 state|";
277
278 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
279 pull_up_enable = "pull-up is enabled|";
280 if (pin_reg & BIT(PULL_UP_SEL_OFF))
281 pull_up_sel = "8k pull-up|";
282 else
283 pull_up_sel = "4k pull-up|";
284 } else {
285 pull_up_enable = "pull-up is disabled|";
286 pull_up_sel = " ";
287 }
288
289 if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF))
290 pull_down_enable = "pull-down is enabled|";
291 else
292 pull_down_enable = "Pull-down is disabled|";
293
294 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
295 pin_sts = " ";
296 output_enable = "output is enabled|";
297 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
298 output_value = "output is high|";
299 else
300 output_value = "output is low|";
301 } else {
302 output_enable = "output is disabled|";
303 output_value = " ";
304
305 if (pin_reg & BIT(PIN_STS_OFF))
306 pin_sts = "input is high|";
307 else
308 pin_sts = "input is low|";
309 }
310
311 seq_printf(s, "%s %s %s %s %s %s\n"
312 " %s %s %s %s %s %s %s 0x%x\n",
313 level_trig, active_level, interrupt_enable,
314 interrupt_mask, wake_cntrl0, wake_cntrl1,
315 wake_cntrl2, pin_sts, pull_up_sel,
316 pull_up_enable, pull_down_enable,
317 output_value, output_enable, pin_reg);
318 }
319 }
320 }
321 #else
322 #define amd_gpio_dbg_show NULL
323 #endif
324
325 static void amd_gpio_irq_enable(struct irq_data *d)
326 {
327 u32 pin_reg;
328 unsigned long flags;
329 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
330 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
331
332 spin_lock_irqsave(&gpio_dev->lock, flags);
333 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
334 /*
335 Suppose BIOS or Bootloader sets specific debounce for the
336 GPIO. if not, set debounce to be 2.75ms.
337 */
338 if ((pin_reg & DB_TMR_OUT_MASK) == 0) {
339 pin_reg |= 0xf;
340 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
341 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
342 }
343 pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
344 pin_reg |= BIT(INTERRUPT_MASK_OFF);
345 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
346 spin_unlock_irqrestore(&gpio_dev->lock, flags);
347 }
348
349 static void amd_gpio_irq_disable(struct irq_data *d)
350 {
351 u32 pin_reg;
352 unsigned long flags;
353 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
354 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
355
356 spin_lock_irqsave(&gpio_dev->lock, flags);
357 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
358 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
359 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
360 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
361 spin_unlock_irqrestore(&gpio_dev->lock, flags);
362 }
363
364 static void amd_gpio_irq_mask(struct irq_data *d)
365 {
366 u32 pin_reg;
367 unsigned long flags;
368 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
369 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
370
371 spin_lock_irqsave(&gpio_dev->lock, flags);
372 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
373 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
374 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
375 spin_unlock_irqrestore(&gpio_dev->lock, flags);
376 }
377
378 static void amd_gpio_irq_unmask(struct irq_data *d)
379 {
380 u32 pin_reg;
381 unsigned long flags;
382 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
383 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
384
385 spin_lock_irqsave(&gpio_dev->lock, flags);
386 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
387 pin_reg |= BIT(INTERRUPT_MASK_OFF);
388 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
389 spin_unlock_irqrestore(&gpio_dev->lock, flags);
390 }
391
392 static void amd_gpio_irq_eoi(struct irq_data *d)
393 {
394 u32 reg;
395 unsigned long flags;
396 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
397 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
398
399 spin_lock_irqsave(&gpio_dev->lock, flags);
400 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
401 reg |= EOI_MASK;
402 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
403 spin_unlock_irqrestore(&gpio_dev->lock, flags);
404 }
405
406 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
407 {
408 int ret = 0;
409 u32 pin_reg;
410 unsigned long flags;
411 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
412 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
413
414 spin_lock_irqsave(&gpio_dev->lock, flags);
415 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
416
417 switch (type & IRQ_TYPE_SENSE_MASK) {
418 case IRQ_TYPE_EDGE_RISING:
419 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
420 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
421 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
422 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
423 __irq_set_handler_locked(d->irq, handle_edge_irq);
424 break;
425
426 case IRQ_TYPE_EDGE_FALLING:
427 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
428 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
429 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
430 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
431 __irq_set_handler_locked(d->irq, handle_edge_irq);
432 break;
433
434 case IRQ_TYPE_EDGE_BOTH:
435 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
436 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
437 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
438 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
439 __irq_set_handler_locked(d->irq, handle_edge_irq);
440 break;
441
442 case IRQ_TYPE_LEVEL_HIGH:
443 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
444 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
445 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
446 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
447 pin_reg |= DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF;
448 __irq_set_handler_locked(d->irq, handle_level_irq);
449 break;
450
451 case IRQ_TYPE_LEVEL_LOW:
452 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
453 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
454 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
455 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
456 pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF;
457 __irq_set_handler_locked(d->irq, handle_level_irq);
458 break;
459
460 case IRQ_TYPE_NONE:
461 break;
462
463 default:
464 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
465 ret = -EINVAL;
466 }
467
468 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
469 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
470 spin_unlock_irqrestore(&gpio_dev->lock, flags);
471
472 return ret;
473 }
474
475 static void amd_irq_ack(struct irq_data *d)
476 {
477 /*
478 * based on HW design,there is no need to ack HW
479 * before handle current irq. But this routine is
480 * necessary for handle_edge_irq
481 */
482 }
483
484 static struct irq_chip amd_gpio_irqchip = {
485 .name = "amd_gpio",
486 .irq_ack = amd_irq_ack,
487 .irq_enable = amd_gpio_irq_enable,
488 .irq_disable = amd_gpio_irq_disable,
489 .irq_mask = amd_gpio_irq_mask,
490 .irq_unmask = amd_gpio_irq_unmask,
491 .irq_eoi = amd_gpio_irq_eoi,
492 .irq_set_type = amd_gpio_irq_set_type,
493 };
494
495 static void amd_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
496 {
497 u32 i;
498 u32 off;
499 u32 reg;
500 u32 pin_reg;
501 u64 reg64;
502 int handled = 0;
503 unsigned long flags;
504 struct irq_chip *chip = irq_get_chip(irq);
505 struct gpio_chip *gc = irq_desc_get_handler_data(desc);
506 struct amd_gpio *gpio_dev = to_amd_gpio(gc);
507
508 chained_irq_enter(chip, desc);
509 /*enable GPIO interrupt again*/
510 spin_lock_irqsave(&gpio_dev->lock, flags);
511 reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
512 reg64 = reg;
513 reg64 = reg64 << 32;
514
515 reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
516 reg64 |= reg;
517 spin_unlock_irqrestore(&gpio_dev->lock, flags);
518
519 /*
520 * first 46 bits indicates interrupt status.
521 * one bit represents four interrupt sources.
522 */
523 for (off = 0; off < 46 ; off++) {
524 if (reg64 & BIT(off)) {
525 for (i = 0; i < 4; i++) {
526 pin_reg = readl(gpio_dev->base +
527 (off * 4 + i) * 4);
528 if ((pin_reg & BIT(INTERRUPT_STS_OFF)) ||
529 (pin_reg & BIT(WAKE_STS_OFF))) {
530 irq = irq_find_mapping(gc->irqdomain,
531 off * 4 + i);
532 generic_handle_irq(irq);
533 writel(pin_reg,
534 gpio_dev->base
535 + (off * 4 + i) * 4);
536 handled++;
537 }
538 }
539 }
540 }
541
542 if (handled == 0)
543 handle_bad_irq(irq, desc);
544
545 spin_lock_irqsave(&gpio_dev->lock, flags);
546 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
547 reg |= EOI_MASK;
548 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
549 spin_unlock_irqrestore(&gpio_dev->lock, flags);
550
551 chained_irq_exit(chip, desc);
552 }
553
554 static int amd_get_groups_count(struct pinctrl_dev *pctldev)
555 {
556 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
557
558 return gpio_dev->ngroups;
559 }
560
561 static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
562 unsigned group)
563 {
564 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
565
566 return gpio_dev->groups[group].name;
567 }
568
569 static int amd_get_group_pins(struct pinctrl_dev *pctldev,
570 unsigned group,
571 const unsigned **pins,
572 unsigned *num_pins)
573 {
574 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
575
576 *pins = gpio_dev->groups[group].pins;
577 *num_pins = gpio_dev->groups[group].npins;
578 return 0;
579 }
580
581 static const struct pinctrl_ops amd_pinctrl_ops = {
582 .get_groups_count = amd_get_groups_count,
583 .get_group_name = amd_get_group_name,
584 .get_group_pins = amd_get_group_pins,
585 #ifdef CONFIG_OF
586 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
587 .dt_free_map = pinctrl_utils_dt_free_map,
588 #endif
589 };
590
591 static int amd_pinconf_get(struct pinctrl_dev *pctldev,
592 unsigned int pin,
593 unsigned long *config)
594 {
595 u32 pin_reg;
596 unsigned arg;
597 unsigned long flags;
598 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
599 enum pin_config_param param = pinconf_to_config_param(*config);
600
601 spin_lock_irqsave(&gpio_dev->lock, flags);
602 pin_reg = readl(gpio_dev->base + pin*4);
603 spin_unlock_irqrestore(&gpio_dev->lock, flags);
604 switch (param) {
605 case PIN_CONFIG_INPUT_DEBOUNCE:
606 arg = pin_reg & DB_TMR_OUT_MASK;
607 break;
608
609 case PIN_CONFIG_BIAS_PULL_DOWN:
610 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
611 break;
612
613 case PIN_CONFIG_BIAS_PULL_UP:
614 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
615 break;
616
617 case PIN_CONFIG_DRIVE_STRENGTH:
618 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
619 break;
620
621 default:
622 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
623 param);
624 return -ENOTSUPP;
625 }
626
627 *config = pinconf_to_config_packed(param, arg);
628
629 return 0;
630 }
631
632 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
633 unsigned long *configs, unsigned num_configs)
634 {
635 int i;
636 u32 arg;
637 int ret = 0;
638 u32 pin_reg;
639 unsigned long flags;
640 enum pin_config_param param;
641 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
642
643 spin_lock_irqsave(&gpio_dev->lock, flags);
644 for (i = 0; i < num_configs; i++) {
645 param = pinconf_to_config_param(configs[i]);
646 arg = pinconf_to_config_argument(configs[i]);
647 pin_reg = readl(gpio_dev->base + pin*4);
648
649 switch (param) {
650 case PIN_CONFIG_INPUT_DEBOUNCE:
651 pin_reg &= ~DB_TMR_OUT_MASK;
652 pin_reg |= arg & DB_TMR_OUT_MASK;
653 break;
654
655 case PIN_CONFIG_BIAS_PULL_DOWN:
656 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
657 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
658 break;
659
660 case PIN_CONFIG_BIAS_PULL_UP:
661 pin_reg &= ~BIT(PULL_UP_SEL_OFF);
662 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
663 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
664 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
665 break;
666
667 case PIN_CONFIG_DRIVE_STRENGTH:
668 pin_reg &= ~(DRV_STRENGTH_SEL_MASK
669 << DRV_STRENGTH_SEL_OFF);
670 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
671 << DRV_STRENGTH_SEL_OFF;
672 break;
673
674 default:
675 dev_err(&gpio_dev->pdev->dev,
676 "Invalid config param %04x\n", param);
677 ret = -ENOTSUPP;
678 }
679
680 writel(pin_reg, gpio_dev->base + pin*4);
681 }
682 spin_unlock_irqrestore(&gpio_dev->lock, flags);
683
684 return ret;
685 }
686
687 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
688 unsigned int group,
689 unsigned long *config)
690 {
691 const unsigned *pins;
692 unsigned npins;
693 int ret;
694
695 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
696 if (ret)
697 return ret;
698
699 if (amd_pinconf_get(pctldev, pins[0], config))
700 return -ENOTSUPP;
701
702 return 0;
703 }
704
705 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
706 unsigned group, unsigned long *configs,
707 unsigned num_configs)
708 {
709 const unsigned *pins;
710 unsigned npins;
711 int i, ret;
712
713 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
714 if (ret)
715 return ret;
716 for (i = 0; i < npins; i++) {
717 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
718 return -ENOTSUPP;
719 }
720 return 0;
721 }
722
723 static const struct pinconf_ops amd_pinconf_ops = {
724 .pin_config_get = amd_pinconf_get,
725 .pin_config_set = amd_pinconf_set,
726 .pin_config_group_get = amd_pinconf_group_get,
727 .pin_config_group_set = amd_pinconf_group_set,
728 };
729
730 static struct pinctrl_desc amd_pinctrl_desc = {
731 .pins = kerncz_pins,
732 .npins = ARRAY_SIZE(kerncz_pins),
733 .pctlops = &amd_pinctrl_ops,
734 .confops = &amd_pinconf_ops,
735 .owner = THIS_MODULE,
736 };
737
738 static int amd_gpio_probe(struct platform_device *pdev)
739 {
740 int ret = 0;
741 int irq_base;
742 struct resource *res;
743 struct amd_gpio *gpio_dev;
744
745 gpio_dev = devm_kzalloc(&pdev->dev,
746 sizeof(struct amd_gpio), GFP_KERNEL);
747 if (!gpio_dev)
748 return -ENOMEM;
749
750 spin_lock_init(&gpio_dev->lock);
751
752 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
753 if (!res) {
754 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
755 return -EINVAL;
756 }
757
758 gpio_dev->base = devm_ioremap_nocache(&pdev->dev, res->start,
759 resource_size(res));
760 if (IS_ERR(gpio_dev->base))
761 return PTR_ERR(gpio_dev->base);
762
763 irq_base = platform_get_irq(pdev, 0);
764 if (irq_base < 0) {
765 dev_err(&pdev->dev, "Failed to get gpio IRQ.\n");
766 return -EINVAL;
767 }
768
769 gpio_dev->pdev = pdev;
770 gpio_dev->gc.direction_input = amd_gpio_direction_input;
771 gpio_dev->gc.direction_output = amd_gpio_direction_output;
772 gpio_dev->gc.get = amd_gpio_get_value;
773 gpio_dev->gc.set = amd_gpio_set_value;
774 gpio_dev->gc.set_debounce = amd_gpio_set_debounce;
775 gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
776
777 gpio_dev->gc.base = 0;
778 gpio_dev->gc.label = pdev->name;
779 gpio_dev->gc.owner = THIS_MODULE;
780 gpio_dev->gc.dev = &pdev->dev;
781 gpio_dev->gc.ngpio = TOTAL_NUMBER_OF_PINS;
782 #if defined(CONFIG_OF_GPIO)
783 gpio_dev->gc.of_node = pdev->dev.of_node;
784 #endif
785
786 gpio_dev->groups = kerncz_groups;
787 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
788
789 amd_pinctrl_desc.name = dev_name(&pdev->dev);
790 gpio_dev->pctrl = pinctrl_register(&amd_pinctrl_desc,
791 &pdev->dev, gpio_dev);
792 if (!gpio_dev->pctrl) {
793 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
794 return -ENODEV;
795 }
796
797 ret = gpiochip_add(&gpio_dev->gc);
798 if (ret)
799 goto out1;
800
801 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
802 0, 0, TOTAL_NUMBER_OF_PINS);
803 if (ret) {
804 dev_err(&pdev->dev, "Failed to add pin range\n");
805 goto out2;
806 }
807
808 ret = gpiochip_irqchip_add(&gpio_dev->gc,
809 &amd_gpio_irqchip,
810 0,
811 handle_simple_irq,
812 IRQ_TYPE_NONE);
813 if (ret) {
814 dev_err(&pdev->dev, "could not add irqchip\n");
815 ret = -ENODEV;
816 goto out2;
817 }
818
819 gpiochip_set_chained_irqchip(&gpio_dev->gc,
820 &amd_gpio_irqchip,
821 irq_base,
822 amd_gpio_irq_handler);
823
824 platform_set_drvdata(pdev, gpio_dev);
825
826 dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
827 return ret;
828
829 out2:
830 gpiochip_remove(&gpio_dev->gc);
831
832 out1:
833 pinctrl_unregister(gpio_dev->pctrl);
834 return ret;
835 }
836
837 static int amd_gpio_remove(struct platform_device *pdev)
838 {
839 struct amd_gpio *gpio_dev;
840
841 gpio_dev = platform_get_drvdata(pdev);
842
843 gpiochip_remove(&gpio_dev->gc);
844 pinctrl_unregister(gpio_dev->pctrl);
845
846 return 0;
847 }
848
849 static const struct acpi_device_id amd_gpio_acpi_match[] = {
850 { "AMD0030", 0 },
851 { },
852 };
853 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
854
855 static struct platform_driver amd_gpio_driver = {
856 .driver = {
857 .name = "amd_gpio",
858 .owner = THIS_MODULE,
859 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
860 },
861 .probe = amd_gpio_probe,
862 .remove = amd_gpio_remove,
863 };
864
865 module_platform_driver(amd_gpio_driver);
866
867 MODULE_LICENSE("GPL v2");
868 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
869 MODULE_DESCRIPTION("AMD GPIO pinctrl driver");
Linux with added FPC-III support