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UBUNTU: [Config] arm64: snapdragon: DRM_MSM=m
[mirror_ubuntu-bionic-kernel.git] / drivers / pinctrl / pinctrl-amd.c
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 * Contact Information: Nehal Shah <Nehal-bakulchandra.Shah@amd.com>
13 * Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
14 *
15 */
16
17 #include <linux/err.h>
18 #include <linux/bug.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/spinlock.h>
22 #include <linux/compiler.h>
23 #include <linux/types.h>
24 #include <linux/errno.h>
25 #include <linux/log2.h>
26 #include <linux/io.h>
27 #include <linux/gpio.h>
28 #include <linux/slab.h>
29 #include <linux/platform_device.h>
30 #include <linux/mutex.h>
31 #include <linux/acpi.h>
32 #include <linux/seq_file.h>
33 #include <linux/interrupt.h>
34 #include <linux/list.h>
35 #include <linux/bitops.h>
36 #include <linux/pinctrl/pinconf.h>
37 #include <linux/pinctrl/pinconf-generic.h>
38
39 #include "core.h"
40 #include "pinctrl-utils.h"
41 #include "pinctrl-amd.h"
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 = gpiochip_get_data(gc);
48
49 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
50 pin_reg = readl(gpio_dev->base + offset * 4);
51 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
52 writel(pin_reg, gpio_dev->base + offset * 4);
53 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
54
55 return 0;
56 }
57
58 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
59 int value)
60 {
61 u32 pin_reg;
62 unsigned long flags;
63 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
64
65 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
66 pin_reg = readl(gpio_dev->base + offset * 4);
67 pin_reg |= BIT(OUTPUT_ENABLE_OFF);
68 if (value)
69 pin_reg |= BIT(OUTPUT_VALUE_OFF);
70 else
71 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
72 writel(pin_reg, gpio_dev->base + offset * 4);
73 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
74
75 return 0;
76 }
77
78 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
79 {
80 u32 pin_reg;
81 unsigned long flags;
82 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
83
84 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
85 pin_reg = readl(gpio_dev->base + offset * 4);
86 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
87
88 return !!(pin_reg & BIT(PIN_STS_OFF));
89 }
90
91 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
92 {
93 u32 pin_reg;
94 unsigned long flags;
95 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
96
97 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
98 pin_reg = readl(gpio_dev->base + offset * 4);
99 if (value)
100 pin_reg |= BIT(OUTPUT_VALUE_OFF);
101 else
102 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
103 writel(pin_reg, gpio_dev->base + offset * 4);
104 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
105 }
106
107 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
108 unsigned debounce)
109 {
110 u32 time;
111 u32 pin_reg;
112 int ret = 0;
113 unsigned long flags;
114 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
115
116 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
117 pin_reg = readl(gpio_dev->base + offset * 4);
118
119 if (debounce) {
120 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
121 pin_reg &= ~DB_TMR_OUT_MASK;
122 /*
123 Debounce Debounce Timer Max
124 TmrLarge TmrOutUnit Unit Debounce
125 Time
126 0 0 61 usec (2 RtcClk) 976 usec
127 0 1 244 usec (8 RtcClk) 3.9 msec
128 1 0 15.6 msec (512 RtcClk) 250 msec
129 1 1 62.5 msec (2048 RtcClk) 1 sec
130 */
131
132 if (debounce < 61) {
133 pin_reg |= 1;
134 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
135 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
136 } else if (debounce < 976) {
137 time = debounce / 61;
138 pin_reg |= time & DB_TMR_OUT_MASK;
139 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
140 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
141 } else if (debounce < 3900) {
142 time = debounce / 244;
143 pin_reg |= time & DB_TMR_OUT_MASK;
144 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
145 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
146 } else if (debounce < 250000) {
147 time = debounce / 15600;
148 pin_reg |= time & DB_TMR_OUT_MASK;
149 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
150 pin_reg |= BIT(DB_TMR_LARGE_OFF);
151 } else if (debounce < 1000000) {
152 time = debounce / 62500;
153 pin_reg |= time & DB_TMR_OUT_MASK;
154 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
155 pin_reg |= BIT(DB_TMR_LARGE_OFF);
156 } else {
157 pin_reg &= ~DB_CNTRl_MASK;
158 ret = -EINVAL;
159 }
160 } else {
161 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
162 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
163 pin_reg &= ~DB_TMR_OUT_MASK;
164 pin_reg &= ~DB_CNTRl_MASK;
165 }
166 writel(pin_reg, gpio_dev->base + offset * 4);
167 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
168
169 return ret;
170 }
171
172 static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset,
173 unsigned long config)
174 {
175 u32 debounce;
176
177 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
178 return -ENOTSUPP;
179
180 debounce = pinconf_to_config_argument(config);
181 return amd_gpio_set_debounce(gc, offset, debounce);
182 }
183
184 #ifdef CONFIG_DEBUG_FS
185 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
186 {
187 u32 pin_reg;
188 unsigned long flags;
189 unsigned int bank, i, pin_num;
190 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
191
192 char *level_trig;
193 char *active_level;
194 char *interrupt_enable;
195 char *interrupt_mask;
196 char *wake_cntrl0;
197 char *wake_cntrl1;
198 char *wake_cntrl2;
199 char *pin_sts;
200 char *pull_up_sel;
201 char *pull_up_enable;
202 char *pull_down_enable;
203 char *output_value;
204 char *output_enable;
205
206 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
207 seq_printf(s, "GPIO bank%d\t", bank);
208
209 switch (bank) {
210 case 0:
211 i = 0;
212 pin_num = AMD_GPIO_PINS_BANK0;
213 break;
214 case 1:
215 i = 64;
216 pin_num = AMD_GPIO_PINS_BANK1 + i;
217 break;
218 case 2:
219 i = 128;
220 pin_num = AMD_GPIO_PINS_BANK2 + i;
221 break;
222 case 3:
223 i = 192;
224 pin_num = AMD_GPIO_PINS_BANK3 + i;
225 break;
226 default:
227 /* Illegal bank number, ignore */
228 continue;
229 }
230 for (; i < pin_num; i++) {
231 seq_printf(s, "pin%d\t", i);
232 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
233 pin_reg = readl(gpio_dev->base + i * 4);
234 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
235
236 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
237 interrupt_enable = "interrupt is enabled|";
238
239 if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF)) &&
240 !(pin_reg & BIT(ACTIVE_LEVEL_OFF + 1)))
241 active_level = "Active low|";
242 else if (pin_reg & BIT(ACTIVE_LEVEL_OFF) &&
243 !(pin_reg & BIT(ACTIVE_LEVEL_OFF + 1)))
244 active_level = "Active high|";
245 else if (!(pin_reg & BIT(ACTIVE_LEVEL_OFF)) &&
246 pin_reg & BIT(ACTIVE_LEVEL_OFF + 1))
247 active_level = "Active on both|";
248 else
249 active_level = "Unknown Active level|";
250
251 if (pin_reg & BIT(LEVEL_TRIG_OFF))
252 level_trig = "Level trigger|";
253 else
254 level_trig = "Edge trigger|";
255
256 } else {
257 interrupt_enable =
258 "interrupt is disabled|";
259 active_level = " ";
260 level_trig = " ";
261 }
262
263 if (pin_reg & BIT(INTERRUPT_MASK_OFF))
264 interrupt_mask =
265 "interrupt is unmasked|";
266 else
267 interrupt_mask =
268 "interrupt is masked|";
269
270 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
271 wake_cntrl0 = "enable wakeup in S0i3 state|";
272 else
273 wake_cntrl0 = "disable wakeup in S0i3 state|";
274
275 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
276 wake_cntrl1 = "enable wakeup in S3 state|";
277 else
278 wake_cntrl1 = "disable wakeup in S3 state|";
279
280 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
281 wake_cntrl2 = "enable wakeup in S4/S5 state|";
282 else
283 wake_cntrl2 = "disable wakeup in S4/S5 state|";
284
285 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
286 pull_up_enable = "pull-up is enabled|";
287 if (pin_reg & BIT(PULL_UP_SEL_OFF))
288 pull_up_sel = "8k pull-up|";
289 else
290 pull_up_sel = "4k pull-up|";
291 } else {
292 pull_up_enable = "pull-up is disabled|";
293 pull_up_sel = " ";
294 }
295
296 if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF))
297 pull_down_enable = "pull-down is enabled|";
298 else
299 pull_down_enable = "Pull-down is disabled|";
300
301 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
302 pin_sts = " ";
303 output_enable = "output is enabled|";
304 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
305 output_value = "output is high|";
306 else
307 output_value = "output is low|";
308 } else {
309 output_enable = "output is disabled|";
310 output_value = " ";
311
312 if (pin_reg & BIT(PIN_STS_OFF))
313 pin_sts = "input is high|";
314 else
315 pin_sts = "input is low|";
316 }
317
318 seq_printf(s, "%s %s %s %s %s %s\n"
319 " %s %s %s %s %s %s %s 0x%x\n",
320 level_trig, active_level, interrupt_enable,
321 interrupt_mask, wake_cntrl0, wake_cntrl1,
322 wake_cntrl2, pin_sts, pull_up_sel,
323 pull_up_enable, pull_down_enable,
324 output_value, output_enable, pin_reg);
325 }
326 }
327 }
328 #else
329 #define amd_gpio_dbg_show NULL
330 #endif
331
332 static void amd_gpio_irq_enable(struct irq_data *d)
333 {
334 u32 pin_reg;
335 unsigned long flags;
336 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
337 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
338
339 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
340 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
341 pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
342 pin_reg |= BIT(INTERRUPT_MASK_OFF);
343 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
344 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
345 }
346
347 static void amd_gpio_irq_disable(struct irq_data *d)
348 {
349 u32 pin_reg;
350 unsigned long flags;
351 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
352 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
353
354 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
355 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
356 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
357 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
358 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
359 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
360 }
361
362 static void amd_gpio_irq_mask(struct irq_data *d)
363 {
364 u32 pin_reg;
365 unsigned long flags;
366 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
367 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
368
369 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
370 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
371 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
372 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
373 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
374 }
375
376 static void amd_gpio_irq_unmask(struct irq_data *d)
377 {
378 u32 pin_reg;
379 unsigned long flags;
380 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
381 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
382
383 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
384 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
385 pin_reg |= BIT(INTERRUPT_MASK_OFF);
386 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
387 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
388 }
389
390 static void amd_gpio_irq_eoi(struct irq_data *d)
391 {
392 u32 reg;
393 unsigned long flags;
394 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
395 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
396
397 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
398 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
399 reg |= EOI_MASK;
400 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
401 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
402 }
403
404 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
405 {
406 int ret = 0;
407 u32 pin_reg;
408 unsigned long flags, irq_flags;
409 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
410 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
411
412 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
413 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
414
415 /* Ignore the settings coming from the client and
416 * read the values from the ACPI tables
417 * while setting the trigger type
418 */
419
420 irq_flags = irq_get_trigger_type(d->irq);
421 if (irq_flags != IRQ_TYPE_NONE)
422 type = irq_flags;
423
424 switch (type & IRQ_TYPE_SENSE_MASK) {
425 case IRQ_TYPE_EDGE_RISING:
426 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
427 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
428 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
429 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
430 irq_set_handler_locked(d, handle_edge_irq);
431 break;
432
433 case IRQ_TYPE_EDGE_FALLING:
434 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
435 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
436 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
437 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
438 irq_set_handler_locked(d, handle_edge_irq);
439 break;
440
441 case IRQ_TYPE_EDGE_BOTH:
442 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
443 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
444 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
445 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
446 irq_set_handler_locked(d, handle_edge_irq);
447 break;
448
449 case IRQ_TYPE_LEVEL_HIGH:
450 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
451 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
452 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
453 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
454 pin_reg |= DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF;
455 irq_set_handler_locked(d, handle_level_irq);
456 break;
457
458 case IRQ_TYPE_LEVEL_LOW:
459 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
460 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
461 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
462 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
463 pin_reg |= DB_TYPE_PRESERVE_HIGH_GLITCH << DB_CNTRL_OFF;
464 irq_set_handler_locked(d, handle_level_irq);
465 break;
466
467 case IRQ_TYPE_NONE:
468 break;
469
470 default:
471 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
472 ret = -EINVAL;
473 }
474
475 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
476 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
477 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
478
479 return ret;
480 }
481
482 static void amd_irq_ack(struct irq_data *d)
483 {
484 /*
485 * based on HW design,there is no need to ack HW
486 * before handle current irq. But this routine is
487 * necessary for handle_edge_irq
488 */
489 }
490
491 static struct irq_chip amd_gpio_irqchip = {
492 .name = "amd_gpio",
493 .irq_ack = amd_irq_ack,
494 .irq_enable = amd_gpio_irq_enable,
495 .irq_disable = amd_gpio_irq_disable,
496 .irq_mask = amd_gpio_irq_mask,
497 .irq_unmask = amd_gpio_irq_unmask,
498 .irq_eoi = amd_gpio_irq_eoi,
499 .irq_set_type = amd_gpio_irq_set_type,
500 .flags = IRQCHIP_SKIP_SET_WAKE,
501 };
502
503 #define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
504
505 static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
506 {
507 struct amd_gpio *gpio_dev = dev_id;
508 struct gpio_chip *gc = &gpio_dev->gc;
509 irqreturn_t ret = IRQ_NONE;
510 unsigned int i, irqnr;
511 unsigned long flags;
512 u32 *regs, regval;
513 u64 status, mask;
514
515 /* Read the wake status */
516 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
517 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
518 status <<= 32;
519 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
520 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
521
522 /* Bit 0-45 contain the relevant status bits */
523 status &= (1ULL << 46) - 1;
524 regs = gpio_dev->base;
525 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
526 if (!(status & mask))
527 continue;
528 status &= ~mask;
529
530 /* Each status bit covers four pins */
531 for (i = 0; i < 4; i++) {
532 regval = readl(regs + i);
533 if (!(regval & PIN_IRQ_PENDING))
534 continue;
535 irq = irq_find_mapping(gc->irq.domain, irqnr + i);
536 generic_handle_irq(irq);
537
538 /* Clear interrupt.
539 * We must read the pin register again, in case the
540 * value was changed while executing
541 * generic_handle_irq() above.
542 */
543 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
544 regval = readl(regs + i);
545 writel(regval, regs + i);
546 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
547 ret = IRQ_HANDLED;
548 }
549 }
550
551 /* Signal EOI to the GPIO unit */
552 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
553 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
554 regval |= EOI_MASK;
555 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
556 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
557
558 return ret;
559 }
560
561 static int amd_get_groups_count(struct pinctrl_dev *pctldev)
562 {
563 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
564
565 return gpio_dev->ngroups;
566 }
567
568 static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
569 unsigned group)
570 {
571 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
572
573 return gpio_dev->groups[group].name;
574 }
575
576 static int amd_get_group_pins(struct pinctrl_dev *pctldev,
577 unsigned group,
578 const unsigned **pins,
579 unsigned *num_pins)
580 {
581 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
582
583 *pins = gpio_dev->groups[group].pins;
584 *num_pins = gpio_dev->groups[group].npins;
585 return 0;
586 }
587
588 static const struct pinctrl_ops amd_pinctrl_ops = {
589 .get_groups_count = amd_get_groups_count,
590 .get_group_name = amd_get_group_name,
591 .get_group_pins = amd_get_group_pins,
592 #ifdef CONFIG_OF
593 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
594 .dt_free_map = pinctrl_utils_free_map,
595 #endif
596 };
597
598 static int amd_pinconf_get(struct pinctrl_dev *pctldev,
599 unsigned int pin,
600 unsigned long *config)
601 {
602 u32 pin_reg;
603 unsigned arg;
604 unsigned long flags;
605 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
606 enum pin_config_param param = pinconf_to_config_param(*config);
607
608 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
609 pin_reg = readl(gpio_dev->base + pin*4);
610 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
611 switch (param) {
612 case PIN_CONFIG_INPUT_DEBOUNCE:
613 arg = pin_reg & DB_TMR_OUT_MASK;
614 break;
615
616 case PIN_CONFIG_BIAS_PULL_DOWN:
617 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
618 break;
619
620 case PIN_CONFIG_BIAS_PULL_UP:
621 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
622 break;
623
624 case PIN_CONFIG_DRIVE_STRENGTH:
625 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
626 break;
627
628 default:
629 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
630 param);
631 return -ENOTSUPP;
632 }
633
634 *config = pinconf_to_config_packed(param, arg);
635
636 return 0;
637 }
638
639 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
640 unsigned long *configs, unsigned num_configs)
641 {
642 int i;
643 u32 arg;
644 int ret = 0;
645 u32 pin_reg;
646 unsigned long flags;
647 enum pin_config_param param;
648 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
649
650 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
651 for (i = 0; i < num_configs; i++) {
652 param = pinconf_to_config_param(configs[i]);
653 arg = pinconf_to_config_argument(configs[i]);
654 pin_reg = readl(gpio_dev->base + pin*4);
655
656 switch (param) {
657 case PIN_CONFIG_INPUT_DEBOUNCE:
658 pin_reg &= ~DB_TMR_OUT_MASK;
659 pin_reg |= arg & DB_TMR_OUT_MASK;
660 break;
661
662 case PIN_CONFIG_BIAS_PULL_DOWN:
663 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
664 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
665 break;
666
667 case PIN_CONFIG_BIAS_PULL_UP:
668 pin_reg &= ~BIT(PULL_UP_SEL_OFF);
669 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
670 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
671 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
672 break;
673
674 case PIN_CONFIG_DRIVE_STRENGTH:
675 pin_reg &= ~(DRV_STRENGTH_SEL_MASK
676 << DRV_STRENGTH_SEL_OFF);
677 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
678 << DRV_STRENGTH_SEL_OFF;
679 break;
680
681 default:
682 dev_err(&gpio_dev->pdev->dev,
683 "Invalid config param %04x\n", param);
684 ret = -ENOTSUPP;
685 }
686
687 writel(pin_reg, gpio_dev->base + pin*4);
688 }
689 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
690
691 return ret;
692 }
693
694 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
695 unsigned int group,
696 unsigned long *config)
697 {
698 const unsigned *pins;
699 unsigned npins;
700 int ret;
701
702 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
703 if (ret)
704 return ret;
705
706 if (amd_pinconf_get(pctldev, pins[0], config))
707 return -ENOTSUPP;
708
709 return 0;
710 }
711
712 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
713 unsigned group, unsigned long *configs,
714 unsigned num_configs)
715 {
716 const unsigned *pins;
717 unsigned npins;
718 int i, ret;
719
720 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
721 if (ret)
722 return ret;
723 for (i = 0; i < npins; i++) {
724 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
725 return -ENOTSUPP;
726 }
727 return 0;
728 }
729
730 static const struct pinconf_ops amd_pinconf_ops = {
731 .pin_config_get = amd_pinconf_get,
732 .pin_config_set = amd_pinconf_set,
733 .pin_config_group_get = amd_pinconf_group_get,
734 .pin_config_group_set = amd_pinconf_group_set,
735 };
736
737 #ifdef CONFIG_PM_SLEEP
738 static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
739 {
740 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
741
742 if (!pd)
743 return false;
744
745 /*
746 * Only restore the pin if it is actually in use by the kernel (or
747 * by userspace).
748 */
749 if (pd->mux_owner || pd->gpio_owner ||
750 gpiochip_line_is_irq(&gpio_dev->gc, pin))
751 return true;
752
753 return false;
754 }
755
756 static int amd_gpio_suspend(struct device *dev)
757 {
758 struct platform_device *pdev = to_platform_device(dev);
759 struct amd_gpio *gpio_dev = platform_get_drvdata(pdev);
760 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
761 int i;
762
763 for (i = 0; i < desc->npins; i++) {
764 int pin = desc->pins[i].number;
765
766 if (!amd_gpio_should_save(gpio_dev, pin))
767 continue;
768
769 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin*4);
770 }
771
772 return 0;
773 }
774
775 static int amd_gpio_resume(struct device *dev)
776 {
777 struct platform_device *pdev = to_platform_device(dev);
778 struct amd_gpio *gpio_dev = platform_get_drvdata(pdev);
779 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
780 int i;
781
782 for (i = 0; i < desc->npins; i++) {
783 int pin = desc->pins[i].number;
784
785 if (!amd_gpio_should_save(gpio_dev, pin))
786 continue;
787
788 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin*4);
789 }
790
791 return 0;
792 }
793
794 static const struct dev_pm_ops amd_gpio_pm_ops = {
795 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
796 amd_gpio_resume)
797 };
798 #endif
799
800 static struct pinctrl_desc amd_pinctrl_desc = {
801 .pins = kerncz_pins,
802 .npins = ARRAY_SIZE(kerncz_pins),
803 .pctlops = &amd_pinctrl_ops,
804 .confops = &amd_pinconf_ops,
805 .owner = THIS_MODULE,
806 };
807
808 static int amd_gpio_probe(struct platform_device *pdev)
809 {
810 int ret = 0;
811 int irq_base;
812 struct resource *res;
813 struct amd_gpio *gpio_dev;
814
815 gpio_dev = devm_kzalloc(&pdev->dev,
816 sizeof(struct amd_gpio), GFP_KERNEL);
817 if (!gpio_dev)
818 return -ENOMEM;
819
820 raw_spin_lock_init(&gpio_dev->lock);
821
822 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
823 if (!res) {
824 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
825 return -EINVAL;
826 }
827
828 gpio_dev->base = devm_ioremap_nocache(&pdev->dev, res->start,
829 resource_size(res));
830 if (!gpio_dev->base)
831 return -ENOMEM;
832
833 irq_base = platform_get_irq(pdev, 0);
834 if (irq_base < 0) {
835 dev_err(&pdev->dev, "Failed to get gpio IRQ: %d\n", irq_base);
836 return irq_base;
837 }
838
839 #ifdef CONFIG_PM_SLEEP
840 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
841 sizeof(*gpio_dev->saved_regs),
842 GFP_KERNEL);
843 if (!gpio_dev->saved_regs)
844 return -ENOMEM;
845 #endif
846
847 gpio_dev->pdev = pdev;
848 gpio_dev->gc.direction_input = amd_gpio_direction_input;
849 gpio_dev->gc.direction_output = amd_gpio_direction_output;
850 gpio_dev->gc.get = amd_gpio_get_value;
851 gpio_dev->gc.set = amd_gpio_set_value;
852 gpio_dev->gc.set_config = amd_gpio_set_config;
853 gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
854
855 gpio_dev->gc.base = -1;
856 gpio_dev->gc.label = pdev->name;
857 gpio_dev->gc.owner = THIS_MODULE;
858 gpio_dev->gc.parent = &pdev->dev;
859 gpio_dev->gc.ngpio = resource_size(res) / 4;
860 #if defined(CONFIG_OF_GPIO)
861 gpio_dev->gc.of_node = pdev->dev.of_node;
862 #endif
863
864 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
865 gpio_dev->groups = kerncz_groups;
866 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
867
868 amd_pinctrl_desc.name = dev_name(&pdev->dev);
869 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
870 gpio_dev);
871 if (IS_ERR(gpio_dev->pctrl)) {
872 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
873 return PTR_ERR(gpio_dev->pctrl);
874 }
875
876 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
877 if (ret)
878 return ret;
879
880 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
881 0, 0, gpio_dev->gc.ngpio);
882 if (ret) {
883 dev_err(&pdev->dev, "Failed to add pin range\n");
884 goto out2;
885 }
886
887 ret = gpiochip_irqchip_add(&gpio_dev->gc,
888 &amd_gpio_irqchip,
889 0,
890 handle_simple_irq,
891 IRQ_TYPE_NONE);
892 if (ret) {
893 dev_err(&pdev->dev, "could not add irqchip\n");
894 ret = -ENODEV;
895 goto out2;
896 }
897
898 ret = devm_request_irq(&pdev->dev, irq_base, amd_gpio_irq_handler, 0,
899 KBUILD_MODNAME, gpio_dev);
900 if (ret)
901 goto out2;
902
903 platform_set_drvdata(pdev, gpio_dev);
904
905 dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
906 return ret;
907
908 out2:
909 gpiochip_remove(&gpio_dev->gc);
910
911 return ret;
912 }
913
914 static int amd_gpio_remove(struct platform_device *pdev)
915 {
916 struct amd_gpio *gpio_dev;
917
918 gpio_dev = platform_get_drvdata(pdev);
919
920 gpiochip_remove(&gpio_dev->gc);
921
922 return 0;
923 }
924
925 static const struct acpi_device_id amd_gpio_acpi_match[] = {
926 { "AMD0030", 0 },
927 { "AMDI0030", 0},
928 { },
929 };
930 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
931
932 static struct platform_driver amd_gpio_driver = {
933 .driver = {
934 .name = "amd_gpio",
935 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
936 #ifdef CONFIG_PM_SLEEP
937 .pm = &amd_gpio_pm_ops,
938 #endif
939 },
940 .probe = amd_gpio_probe,
941 .remove = amd_gpio_remove,
942 };
943
944 module_platform_driver(amd_gpio_driver);
945
946 MODULE_LICENSE("GPL v2");
947 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
948 MODULE_DESCRIPTION("AMD GPIO pinctrl driver");
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