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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GPIO driver for AMD
4 *
5 * Copyright (c) 2014,2015 AMD Corporation.
6 * Authors: Ken Xue <Ken.Xue@amd.com>
7 * Wu, Jeff <Jeff.Wu@amd.com>
8 *
9 */
10
11#include <linux/err.h>
12#include <linux/bug.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/spinlock.h>
16#include <linux/compiler.h>
17#include <linux/types.h>
18#include <linux/errno.h>
19#include <linux/log2.h>
20#include <linux/io.h>
21#include <linux/gpio/driver.h>
22#include <linux/slab.h>
23#include <linux/platform_device.h>
24#include <linux/mutex.h>
25#include <linux/acpi.h>
26#include <linux/seq_file.h>
27#include <linux/interrupt.h>
28#include <linux/list.h>
29#include <linux/bitops.h>
30#include <linux/pinctrl/pinconf.h>
31#include <linux/pinctrl/pinconf-generic.h>
32#include <linux/pinctrl/pinmux.h>
33#include <linux/suspend.h>
34
35#include "core.h"
36#include "pinctrl-utils.h"
37#include "pinctrl-amd.h"
38
39static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
40{
41 unsigned long flags;
42 u32 pin_reg;
43 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
44
45 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
46 pin_reg = readl(gpio_dev->base + offset * 4);
47 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
48
49 if (pin_reg & BIT(OUTPUT_ENABLE_OFF))
50 return GPIO_LINE_DIRECTION_OUT;
51
52 return GPIO_LINE_DIRECTION_IN;
53}
54
55static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
56{
57 unsigned long flags;
58 u32 pin_reg;
59 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
60
61 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
62 pin_reg = readl(gpio_dev->base + offset * 4);
63 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
64 writel(pin_reg, gpio_dev->base + offset * 4);
65 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
66
67 return 0;
68}
69
70static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
71 int value)
72{
73 u32 pin_reg;
74 unsigned long flags;
75 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
76
77 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
78 pin_reg = readl(gpio_dev->base + offset * 4);
79 pin_reg |= BIT(OUTPUT_ENABLE_OFF);
80 if (value)
81 pin_reg |= BIT(OUTPUT_VALUE_OFF);
82 else
83 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
84 writel(pin_reg, gpio_dev->base + offset * 4);
85 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
86
87 return 0;
88}
89
90static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
91{
92 u32 pin_reg;
93 unsigned long flags;
94 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
95
96 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
97 pin_reg = readl(gpio_dev->base + offset * 4);
98 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
99
100 return !!(pin_reg & BIT(PIN_STS_OFF));
101}
102
103static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
104{
105 u32 pin_reg;
106 unsigned long flags;
107 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
108
109 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
110 pin_reg = readl(gpio_dev->base + offset * 4);
111 if (value)
112 pin_reg |= BIT(OUTPUT_VALUE_OFF);
113 else
114 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
115 writel(pin_reg, gpio_dev->base + offset * 4);
116 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
117}
118
119static int amd_gpio_set_debounce(struct amd_gpio *gpio_dev, unsigned int offset,
120 unsigned int debounce)
121{
122 u32 time;
123 u32 pin_reg;
124 int ret = 0;
125
126 /* Use special handling for Pin0 debounce */
127 if (offset == 0) {
128 pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
129 if (pin_reg & INTERNAL_GPIO0_DEBOUNCE)
130 debounce = 0;
131 }
132
133 pin_reg = readl(gpio_dev->base + offset * 4);
134
135 if (debounce) {
136 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
137 pin_reg &= ~DB_TMR_OUT_MASK;
138 /*
139 Debounce Debounce Timer Max
140 TmrLarge TmrOutUnit Unit Debounce
141 Time
142 0 0 61 usec (2 RtcClk) 976 usec
143 0 1 244 usec (8 RtcClk) 3.9 msec
144 1 0 15.6 msec (512 RtcClk) 250 msec
145 1 1 62.5 msec (2048 RtcClk) 1 sec
146 */
147
148 if (debounce < 61) {
149 pin_reg |= 1;
150 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
151 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
152 } else if (debounce < 976) {
153 time = debounce / 61;
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 < 3900) {
158 time = debounce / 244;
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 < 250000) {
163 time = debounce / 15625;
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 if (debounce < 1000000) {
168 time = debounce / 62500;
169 pin_reg |= time & DB_TMR_OUT_MASK;
170 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
171 pin_reg |= BIT(DB_TMR_LARGE_OFF);
172 } else {
173 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
174 ret = -EINVAL;
175 }
176 } else {
177 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
178 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
179 pin_reg &= ~DB_TMR_OUT_MASK;
180 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
181 }
182 writel(pin_reg, gpio_dev->base + offset * 4);
183
184 return ret;
185}
186
187#ifdef CONFIG_DEBUG_FS
188static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
189{
190 u32 pin_reg;
191 u32 db_cntrl;
192 unsigned long flags;
193 unsigned int bank, i, pin_num;
194 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
195
196 bool tmr_out_unit;
197 bool tmr_large;
198
199 char *level_trig;
200 char *active_level;
201 char *interrupt_mask;
202 char *wake_cntrl0;
203 char *wake_cntrl1;
204 char *wake_cntrl2;
205 char *pin_sts;
206 char *interrupt_sts;
207 char *wake_sts;
208 char *orientation;
209 char debounce_value[40];
210 char *debounce_enable;
211 char *wake_cntrlz;
212
213 seq_printf(s, "WAKE_INT_MASTER_REG: 0x%08x\n", readl(gpio_dev->base + WAKE_INT_MASTER_REG));
214 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
215 unsigned int time = 0;
216 unsigned int unit = 0;
217
218 switch (bank) {
219 case 0:
220 i = 0;
221 pin_num = AMD_GPIO_PINS_BANK0;
222 break;
223 case 1:
224 i = 64;
225 pin_num = AMD_GPIO_PINS_BANK1 + i;
226 break;
227 case 2:
228 i = 128;
229 pin_num = AMD_GPIO_PINS_BANK2 + i;
230 break;
231 case 3:
232 i = 192;
233 pin_num = AMD_GPIO_PINS_BANK3 + i;
234 break;
235 default:
236 /* Illegal bank number, ignore */
237 continue;
238 }
239 seq_printf(s, "GPIO bank%d\n", bank);
240 seq_puts(s, "gpio\t int|active|trigger|S0i3| S3|S4/S5| Z|wake|pull| orient| debounce|reg\n");
241 for (; i < pin_num; i++) {
242 seq_printf(s, "#%d\t", i);
243 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
244 pin_reg = readl(gpio_dev->base + i * 4);
245 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
246
247 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
248 u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
249 ACTIVE_LEVEL_MASK;
250
251 if (level == ACTIVE_LEVEL_HIGH)
252 active_level = "↑";
253 else if (level == ACTIVE_LEVEL_LOW)
254 active_level = "↓";
255 else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
256 level == ACTIVE_LEVEL_BOTH)
257 active_level = "b";
258 else
259 active_level = "?";
260
261 if (pin_reg & BIT(LEVEL_TRIG_OFF))
262 level_trig = "level";
263 else
264 level_trig = " edge";
265
266 if (pin_reg & BIT(INTERRUPT_MASK_OFF))
267 interrupt_mask = "😛";
268 else
269 interrupt_mask = "😷";
270
271 if (pin_reg & BIT(INTERRUPT_STS_OFF))
272 interrupt_sts = "🔥";
273 else
274 interrupt_sts = " ";
275
276 seq_printf(s, "%s %s| %s| %s|",
277 interrupt_sts,
278 interrupt_mask,
279 active_level,
280 level_trig);
281 } else
282 seq_puts(s, " ∅| | |");
283
284 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
285 wake_cntrl0 = "⏰";
286 else
287 wake_cntrl0 = " ";
288 seq_printf(s, " %s| ", wake_cntrl0);
289
290 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
291 wake_cntrl1 = "⏰";
292 else
293 wake_cntrl1 = " ";
294 seq_printf(s, "%s|", wake_cntrl1);
295
296 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
297 wake_cntrl2 = "⏰";
298 else
299 wake_cntrl2 = " ";
300 seq_printf(s, " %s|", wake_cntrl2);
301
302 if (pin_reg & BIT(WAKECNTRL_Z_OFF))
303 wake_cntrlz = "⏰";
304 else
305 wake_cntrlz = " ";
306 seq_printf(s, "%s|", wake_cntrlz);
307
308 if (pin_reg & BIT(WAKE_STS_OFF))
309 wake_sts = "🔥";
310 else
311 wake_sts = " ";
312 seq_printf(s, " %s|", wake_sts);
313
314 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
315 seq_puts(s, " ↑ |");
316 } else if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) {
317 seq_puts(s, " ↓ |");
318 } else {
319 seq_puts(s, " |");
320 }
321
322 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
323 pin_sts = "output";
324 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
325 orientation = "↑";
326 else
327 orientation = "↓";
328 } else {
329 pin_sts = "input ";
330 if (pin_reg & BIT(PIN_STS_OFF))
331 orientation = "↑";
332 else
333 orientation = "↓";
334 }
335 seq_printf(s, "%s %s|", pin_sts, orientation);
336
337 db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
338 if (db_cntrl) {
339 tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
340 tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
341 time = pin_reg & DB_TMR_OUT_MASK;
342 if (tmr_large) {
343 if (tmr_out_unit)
344 unit = 62500;
345 else
346 unit = 15625;
347 } else {
348 if (tmr_out_unit)
349 unit = 244;
350 else
351 unit = 61;
352 }
353 if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
354 debounce_enable = "b";
355 else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
356 debounce_enable = "↓";
357 else
358 debounce_enable = "↑";
359 snprintf(debounce_value, sizeof(debounce_value), "%06u", time * unit);
360 seq_printf(s, "%s (🕑 %sus)|", debounce_enable, debounce_value);
361 } else {
362 seq_puts(s, " |");
363 }
364 seq_printf(s, "0x%x\n", pin_reg);
365 }
366 }
367}
368#else
369#define amd_gpio_dbg_show NULL
370#endif
371
372static void amd_gpio_irq_enable(struct irq_data *d)
373{
374 u32 pin_reg;
375 unsigned long flags;
376 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
377 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
378
379 gpiochip_enable_irq(gc, d->hwirq);
380
381 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
382 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
383 pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
384 pin_reg |= BIT(INTERRUPT_MASK_OFF);
385 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
386 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
387}
388
389static void amd_gpio_irq_disable(struct irq_data *d)
390{
391 u32 pin_reg;
392 unsigned long flags;
393 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
394 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
395
396 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
397 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
398 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
399 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
400 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
401 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
402
403 gpiochip_disable_irq(gc, d->hwirq);
404}
405
406static void amd_gpio_irq_mask(struct irq_data *d)
407{
408 u32 pin_reg;
409 unsigned long flags;
410 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
411 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
412
413 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
414 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
415 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
416 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
417 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
418}
419
420static void amd_gpio_irq_unmask(struct irq_data *d)
421{
422 u32 pin_reg;
423 unsigned long flags;
424 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
425 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
426
427 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
428 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
429 pin_reg |= BIT(INTERRUPT_MASK_OFF);
430 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
431 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
432}
433
434static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
435{
436 u32 pin_reg;
437 unsigned long flags;
438 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
439 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
440 u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3);
441 int err;
442
443 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
444 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
445
446 if (on)
447 pin_reg |= wake_mask;
448 else
449 pin_reg &= ~wake_mask;
450
451 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
452 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
453
454 if (on)
455 err = enable_irq_wake(gpio_dev->irq);
456 else
457 err = disable_irq_wake(gpio_dev->irq);
458
459 if (err)
460 dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n",
461 on ? "enable" : "disable");
462
463 return 0;
464}
465
466static void amd_gpio_irq_eoi(struct irq_data *d)
467{
468 u32 reg;
469 unsigned long flags;
470 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
471 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
472
473 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
474 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
475 reg |= EOI_MASK;
476 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
477 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
478}
479
480static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
481{
482 int ret = 0;
483 u32 pin_reg, pin_reg_irq_en, mask;
484 unsigned long flags;
485 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
486 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
487
488 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
489 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
490
491 switch (type & IRQ_TYPE_SENSE_MASK) {
492 case IRQ_TYPE_EDGE_RISING:
493 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
494 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
495 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
496 irq_set_handler_locked(d, handle_edge_irq);
497 break;
498
499 case IRQ_TYPE_EDGE_FALLING:
500 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
501 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
502 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
503 irq_set_handler_locked(d, handle_edge_irq);
504 break;
505
506 case IRQ_TYPE_EDGE_BOTH:
507 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
508 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
509 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
510 irq_set_handler_locked(d, handle_edge_irq);
511 break;
512
513 case IRQ_TYPE_LEVEL_HIGH:
514 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
515 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
516 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
517 irq_set_handler_locked(d, handle_level_irq);
518 break;
519
520 case IRQ_TYPE_LEVEL_LOW:
521 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
522 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
523 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
524 irq_set_handler_locked(d, handle_level_irq);
525 break;
526
527 case IRQ_TYPE_NONE:
528 break;
529
530 default:
531 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
532 ret = -EINVAL;
533 }
534
535 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
536 /*
537 * If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the
538 * debounce registers of any GPIO will block wake/interrupt status
539 * generation for *all* GPIOs for a length of time that depends on
540 * WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the
541 * INTERRUPT_ENABLE bit will read as 0.
542 *
543 * We temporarily enable irq for the GPIO whose configuration is
544 * changing, and then wait for it to read back as 1 to know when
545 * debounce has settled and then disable the irq again.
546 * We do this polling with the spinlock held to ensure other GPIO
547 * access routines do not read an incorrect value for the irq enable
548 * bit of other GPIOs. We keep the GPIO masked while polling to avoid
549 * spurious irqs, and disable the irq again after polling.
550 */
551 mask = BIT(INTERRUPT_ENABLE_OFF);
552 pin_reg_irq_en = pin_reg;
553 pin_reg_irq_en |= mask;
554 pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF);
555 writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4);
556 while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask)
557 continue;
558 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
559 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
560
561 return ret;
562}
563
564static void amd_irq_ack(struct irq_data *d)
565{
566 /*
567 * based on HW design,there is no need to ack HW
568 * before handle current irq. But this routine is
569 * necessary for handle_edge_irq
570 */
571}
572
573static const struct irq_chip amd_gpio_irqchip = {
574 .name = "amd_gpio",
575 .irq_ack = amd_irq_ack,
576 .irq_enable = amd_gpio_irq_enable,
577 .irq_disable = amd_gpio_irq_disable,
578 .irq_mask = amd_gpio_irq_mask,
579 .irq_unmask = amd_gpio_irq_unmask,
580 .irq_set_wake = amd_gpio_irq_set_wake,
581 .irq_eoi = amd_gpio_irq_eoi,
582 .irq_set_type = amd_gpio_irq_set_type,
583 /*
584 * We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
585 * also generates an IRQ. We need the IRQ so the irq_handler can clear
586 * the wake event. Otherwise the wake event will never clear and
587 * prevent the system from suspending.
588 */
589 .flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
590 GPIOCHIP_IRQ_RESOURCE_HELPERS,
591};
592
593#define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
594
595static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
596{
597 struct amd_gpio *gpio_dev = dev_id;
598 struct gpio_chip *gc = &gpio_dev->gc;
599 unsigned int i, irqnr;
600 unsigned long flags;
601 u32 __iomem *regs;
602 bool ret = false;
603 u32 regval;
604 u64 status, mask;
605
606 /* Read the wake status */
607 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
608 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
609 status <<= 32;
610 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
611 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
612
613 /* Bit 0-45 contain the relevant status bits */
614 status &= (1ULL << 46) - 1;
615 regs = gpio_dev->base;
616 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
617 if (!(status & mask))
618 continue;
619 status &= ~mask;
620
621 /* Each status bit covers four pins */
622 for (i = 0; i < 4; i++) {
623 regval = readl(regs + i);
624
625 if (regval & PIN_IRQ_PENDING)
626 pm_pr_dbg("GPIO %d is active: 0x%x",
627 irqnr + i, regval);
628
629 /* caused wake on resume context for shared IRQ */
630 if (irq < 0 && (regval & BIT(WAKE_STS_OFF)))
631 return true;
632
633 if (!(regval & PIN_IRQ_PENDING) ||
634 !(regval & BIT(INTERRUPT_MASK_OFF)))
635 continue;
636 generic_handle_domain_irq_safe(gc->irq.domain, irqnr + i);
637
638 /* Clear interrupt.
639 * We must read the pin register again, in case the
640 * value was changed while executing
641 * generic_handle_domain_irq() above.
642 * If the line is not an irq, disable it in order to
643 * avoid a system hang caused by an interrupt storm.
644 */
645 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
646 regval = readl(regs + i);
647 if (!gpiochip_line_is_irq(gc, irqnr + i)) {
648 regval &= ~BIT(INTERRUPT_MASK_OFF);
649 dev_dbg(&gpio_dev->pdev->dev,
650 "Disabling spurious GPIO IRQ %d\n",
651 irqnr + i);
652 } else {
653 ret = true;
654 }
655 writel(regval, regs + i);
656 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
657 }
658 }
659 /* did not cause wake on resume context for shared IRQ */
660 if (irq < 0)
661 return false;
662
663 /* Signal EOI to the GPIO unit */
664 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
665 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
666 regval |= EOI_MASK;
667 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
668 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
669
670 return ret;
671}
672
673static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
674{
675 return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
676}
677
678static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
679{
680 return do_amd_gpio_irq_handler(-1, dev_id);
681}
682
683static int amd_get_groups_count(struct pinctrl_dev *pctldev)
684{
685 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
686
687 return gpio_dev->ngroups;
688}
689
690static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
691 unsigned group)
692{
693 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
694
695 return gpio_dev->groups[group].name;
696}
697
698static int amd_get_group_pins(struct pinctrl_dev *pctldev,
699 unsigned group,
700 const unsigned **pins,
701 unsigned *num_pins)
702{
703 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
704
705 *pins = gpio_dev->groups[group].pins;
706 *num_pins = gpio_dev->groups[group].npins;
707 return 0;
708}
709
710static const struct pinctrl_ops amd_pinctrl_ops = {
711 .get_groups_count = amd_get_groups_count,
712 .get_group_name = amd_get_group_name,
713 .get_group_pins = amd_get_group_pins,
714#ifdef CONFIG_OF
715 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
716 .dt_free_map = pinctrl_utils_free_map,
717#endif
718};
719
720static int amd_pinconf_get(struct pinctrl_dev *pctldev,
721 unsigned int pin,
722 unsigned long *config)
723{
724 u32 pin_reg;
725 unsigned arg;
726 unsigned long flags;
727 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
728 enum pin_config_param param = pinconf_to_config_param(*config);
729
730 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
731 pin_reg = readl(gpio_dev->base + pin*4);
732 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
733 switch (param) {
734 case PIN_CONFIG_INPUT_DEBOUNCE:
735 arg = pin_reg & DB_TMR_OUT_MASK;
736 break;
737
738 case PIN_CONFIG_BIAS_PULL_DOWN:
739 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
740 break;
741
742 case PIN_CONFIG_BIAS_PULL_UP:
743 arg = (pin_reg >> PULL_UP_ENABLE_OFF) & BIT(0);
744 break;
745
746 case PIN_CONFIG_DRIVE_STRENGTH:
747 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
748 break;
749
750 default:
751 dev_dbg(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
752 param);
753 return -ENOTSUPP;
754 }
755
756 *config = pinconf_to_config_packed(param, arg);
757
758 return 0;
759}
760
761static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
762 unsigned long *configs, unsigned int num_configs)
763{
764 int i;
765 u32 arg;
766 int ret = 0;
767 u32 pin_reg;
768 unsigned long flags;
769 enum pin_config_param param;
770 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
771
772 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
773 for (i = 0; i < num_configs; i++) {
774 param = pinconf_to_config_param(configs[i]);
775 arg = pinconf_to_config_argument(configs[i]);
776 pin_reg = readl(gpio_dev->base + pin*4);
777
778 switch (param) {
779 case PIN_CONFIG_INPUT_DEBOUNCE:
780 ret = amd_gpio_set_debounce(gpio_dev, pin, arg);
781 goto out_unlock;
782
783 case PIN_CONFIG_BIAS_PULL_DOWN:
784 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
785 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
786 break;
787
788 case PIN_CONFIG_BIAS_PULL_UP:
789 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
790 pin_reg |= (arg & BIT(0)) << PULL_UP_ENABLE_OFF;
791 break;
792
793 case PIN_CONFIG_DRIVE_STRENGTH:
794 pin_reg &= ~(DRV_STRENGTH_SEL_MASK
795 << DRV_STRENGTH_SEL_OFF);
796 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
797 << DRV_STRENGTH_SEL_OFF;
798 break;
799
800 default:
801 dev_dbg(&gpio_dev->pdev->dev,
802 "Invalid config param %04x\n", param);
803 ret = -ENOTSUPP;
804 }
805
806 writel(pin_reg, gpio_dev->base + pin*4);
807 }
808out_unlock:
809 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
810
811 return ret;
812}
813
814static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
815 unsigned int group,
816 unsigned long *config)
817{
818 const unsigned *pins;
819 unsigned npins;
820 int ret;
821
822 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
823 if (ret)
824 return ret;
825
826 if (amd_pinconf_get(pctldev, pins[0], config))
827 return -ENOTSUPP;
828
829 return 0;
830}
831
832static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
833 unsigned group, unsigned long *configs,
834 unsigned num_configs)
835{
836 const unsigned *pins;
837 unsigned npins;
838 int i, ret;
839
840 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
841 if (ret)
842 return ret;
843 for (i = 0; i < npins; i++) {
844 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
845 return -ENOTSUPP;
846 }
847 return 0;
848}
849
850static int amd_gpio_set_config(struct gpio_chip *gc, unsigned int pin,
851 unsigned long config)
852{
853 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
854
855 return amd_pinconf_set(gpio_dev->pctrl, pin, &config, 1);
856}
857
858static const struct pinconf_ops amd_pinconf_ops = {
859 .pin_config_get = amd_pinconf_get,
860 .pin_config_set = amd_pinconf_set,
861 .pin_config_group_get = amd_pinconf_group_get,
862 .pin_config_group_set = amd_pinconf_group_set,
863};
864
865static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
866{
867 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
868 unsigned long flags;
869 u32 pin_reg, mask;
870 int i;
871
872 mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
873 BIT(WAKE_CNTRL_OFF_S4);
874
875 for (i = 0; i < desc->npins; i++) {
876 int pin = desc->pins[i].number;
877 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
878
879 if (!pd)
880 continue;
881
882 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
883
884 pin_reg = readl(gpio_dev->base + pin * 4);
885 pin_reg &= ~mask;
886 writel(pin_reg, gpio_dev->base + pin * 4);
887
888 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
889 }
890}
891
892#ifdef CONFIG_PM_SLEEP
893static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
894{
895 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
896
897 if (!pd)
898 return false;
899
900 /*
901 * Only restore the pin if it is actually in use by the kernel (or
902 * by userspace).
903 */
904 if (pd->mux_owner || pd->gpio_owner ||
905 gpiochip_line_is_irq(&gpio_dev->gc, pin))
906 return true;
907
908 return false;
909}
910
911static int amd_gpio_suspend(struct device *dev)
912{
913 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
914 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
915 unsigned long flags;
916 int i;
917
918 for (i = 0; i < desc->npins; i++) {
919 int pin = desc->pins[i].number;
920
921 if (!amd_gpio_should_save(gpio_dev, pin))
922 continue;
923
924 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
925 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
926
927 /* mask any interrupts not intended to be a wake source */
928 if (!(gpio_dev->saved_regs[i] & WAKE_SOURCE)) {
929 writel(gpio_dev->saved_regs[i] & ~BIT(INTERRUPT_MASK_OFF),
930 gpio_dev->base + pin * 4);
931 pm_pr_dbg("Disabling GPIO #%d interrupt for suspend.\n",
932 pin);
933 }
934
935 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
936 }
937
938 return 0;
939}
940
941static int amd_gpio_resume(struct device *dev)
942{
943 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
944 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
945 unsigned long flags;
946 int i;
947
948 for (i = 0; i < desc->npins; i++) {
949 int pin = desc->pins[i].number;
950
951 if (!amd_gpio_should_save(gpio_dev, pin))
952 continue;
953
954 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
955 gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING;
956 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4);
957 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
958 }
959
960 return 0;
961}
962
963static const struct dev_pm_ops amd_gpio_pm_ops = {
964 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
965 amd_gpio_resume)
966};
967#endif
968
969static int amd_get_functions_count(struct pinctrl_dev *pctldev)
970{
971 return ARRAY_SIZE(pmx_functions);
972}
973
974static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector)
975{
976 return pmx_functions[selector].name;
977}
978
979static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector,
980 const char * const **groups,
981 unsigned int * const num_groups)
982{
983 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
984
985 if (!gpio_dev->iomux_base) {
986 dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector);
987 return -EINVAL;
988 }
989
990 *groups = pmx_functions[selector].groups;
991 *num_groups = pmx_functions[selector].ngroups;
992 return 0;
993}
994
995static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group)
996{
997 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
998 struct device *dev = &gpio_dev->pdev->dev;
999 struct pin_desc *pd;
1000 int ind, index;
1001
1002 if (!gpio_dev->iomux_base)
1003 return -EINVAL;
1004
1005 for (index = 0; index < NSELECTS; index++) {
1006 if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index]))
1007 continue;
1008
1009 if (readb(gpio_dev->iomux_base + pmx_functions[function].index) ==
1010 FUNCTION_INVALID) {
1011 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
1012 pmx_functions[function].index);
1013 return -EINVAL;
1014 }
1015
1016 writeb(index, gpio_dev->iomux_base + pmx_functions[function].index);
1017
1018 if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) &
1019 FUNCTION_MASK)) {
1020 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
1021 pmx_functions[function].index);
1022 return -EINVAL;
1023 }
1024
1025 for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) {
1026 if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F")))
1027 continue;
1028
1029 pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]);
1030 pd->mux_owner = gpio_dev->groups[group].name;
1031 }
1032 break;
1033 }
1034
1035 return 0;
1036}
1037
1038static const struct pinmux_ops amd_pmxops = {
1039 .get_functions_count = amd_get_functions_count,
1040 .get_function_name = amd_get_fname,
1041 .get_function_groups = amd_get_groups,
1042 .set_mux = amd_set_mux,
1043};
1044
1045static struct pinctrl_desc amd_pinctrl_desc = {
1046 .pins = kerncz_pins,
1047 .npins = ARRAY_SIZE(kerncz_pins),
1048 .pctlops = &amd_pinctrl_ops,
1049 .pmxops = &amd_pmxops,
1050 .confops = &amd_pinconf_ops,
1051 .owner = THIS_MODULE,
1052};
1053
1054static void amd_get_iomux_res(struct amd_gpio *gpio_dev)
1055{
1056 struct pinctrl_desc *desc = &amd_pinctrl_desc;
1057 struct device *dev = &gpio_dev->pdev->dev;
1058 int index;
1059
1060 index = device_property_match_string(dev, "pinctrl-resource-names", "iomux");
1061 if (index < 0) {
1062 dev_dbg(dev, "iomux not supported\n");
1063 goto out_no_pinmux;
1064 }
1065
1066 gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index);
1067 if (IS_ERR(gpio_dev->iomux_base)) {
1068 dev_dbg(dev, "iomux not supported %d io resource\n", index);
1069 goto out_no_pinmux;
1070 }
1071
1072 return;
1073
1074out_no_pinmux:
1075 desc->pmxops = NULL;
1076}
1077
1078static int amd_gpio_probe(struct platform_device *pdev)
1079{
1080 int ret = 0;
1081 struct resource *res;
1082 struct amd_gpio *gpio_dev;
1083 struct gpio_irq_chip *girq;
1084
1085 gpio_dev = devm_kzalloc(&pdev->dev,
1086 sizeof(struct amd_gpio), GFP_KERNEL);
1087 if (!gpio_dev)
1088 return -ENOMEM;
1089
1090 raw_spin_lock_init(&gpio_dev->lock);
1091
1092 gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1093 if (IS_ERR(gpio_dev->base)) {
1094 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
1095 return PTR_ERR(gpio_dev->base);
1096 }
1097
1098 gpio_dev->irq = platform_get_irq(pdev, 0);
1099 if (gpio_dev->irq < 0)
1100 return gpio_dev->irq;
1101
1102#ifdef CONFIG_PM_SLEEP
1103 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
1104 sizeof(*gpio_dev->saved_regs),
1105 GFP_KERNEL);
1106 if (!gpio_dev->saved_regs)
1107 return -ENOMEM;
1108#endif
1109
1110 gpio_dev->pdev = pdev;
1111 gpio_dev->gc.get_direction = amd_gpio_get_direction;
1112 gpio_dev->gc.direction_input = amd_gpio_direction_input;
1113 gpio_dev->gc.direction_output = amd_gpio_direction_output;
1114 gpio_dev->gc.get = amd_gpio_get_value;
1115 gpio_dev->gc.set = amd_gpio_set_value;
1116 gpio_dev->gc.set_config = amd_gpio_set_config;
1117 gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
1118
1119 gpio_dev->gc.base = -1;
1120 gpio_dev->gc.label = pdev->name;
1121 gpio_dev->gc.owner = THIS_MODULE;
1122 gpio_dev->gc.parent = &pdev->dev;
1123 gpio_dev->gc.ngpio = resource_size(res) / 4;
1124
1125 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
1126 gpio_dev->groups = kerncz_groups;
1127 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
1128
1129 amd_pinctrl_desc.name = dev_name(&pdev->dev);
1130 amd_get_iomux_res(gpio_dev);
1131 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
1132 gpio_dev);
1133 if (IS_ERR(gpio_dev->pctrl)) {
1134 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
1135 return PTR_ERR(gpio_dev->pctrl);
1136 }
1137
1138 /* Disable and mask interrupts */
1139 amd_gpio_irq_init(gpio_dev);
1140
1141 girq = &gpio_dev->gc.irq;
1142 gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
1143 /* This will let us handle the parent IRQ in the driver */
1144 girq->parent_handler = NULL;
1145 girq->num_parents = 0;
1146 girq->parents = NULL;
1147 girq->default_type = IRQ_TYPE_NONE;
1148 girq->handler = handle_simple_irq;
1149
1150 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
1151 if (ret)
1152 return ret;
1153
1154 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
1155 0, 0, gpio_dev->gc.ngpio);
1156 if (ret) {
1157 dev_err(&pdev->dev, "Failed to add pin range\n");
1158 goto out2;
1159 }
1160
1161 ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler,
1162 IRQF_SHARED | IRQF_COND_ONESHOT, KBUILD_MODNAME, gpio_dev);
1163 if (ret)
1164 goto out2;
1165
1166 platform_set_drvdata(pdev, gpio_dev);
1167 acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
1168
1169 dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
1170 return ret;
1171
1172out2:
1173 gpiochip_remove(&gpio_dev->gc);
1174
1175 return ret;
1176}
1177
1178static void amd_gpio_remove(struct platform_device *pdev)
1179{
1180 struct amd_gpio *gpio_dev;
1181
1182 gpio_dev = platform_get_drvdata(pdev);
1183
1184 gpiochip_remove(&gpio_dev->gc);
1185 acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
1186}
1187
1188#ifdef CONFIG_ACPI
1189static const struct acpi_device_id amd_gpio_acpi_match[] = {
1190 { "AMD0030", 0 },
1191 { "AMDI0030", 0},
1192 { "AMDI0031", 0},
1193 { },
1194};
1195MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
1196#endif
1197
1198static struct platform_driver amd_gpio_driver = {
1199 .driver = {
1200 .name = "amd_gpio",
1201 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
1202#ifdef CONFIG_PM_SLEEP
1203 .pm = &amd_gpio_pm_ops,
1204#endif
1205 },
1206 .probe = amd_gpio_probe,
1207 .remove_new = amd_gpio_remove,
1208};
1209
1210module_platform_driver(amd_gpio_driver);
1211
1212MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
1213MODULE_DESCRIPTION("AMD GPIO pinctrl driver");