1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (c) 2014,2015 AMD Corporation.
6 * Authors: Ken Xue <Ken.Xue@amd.com>
7 * Wu, Jeff <Jeff.Wu@amd.com>
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>
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>
35 #include "pinctrl-utils.h"
36 #include "pinctrl-amd.h"
38 static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
42 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
44 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
45 pin_reg = readl(gpio_dev->base + offset * 4);
46 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
48 if (pin_reg & BIT(OUTPUT_ENABLE_OFF))
49 return GPIO_LINE_DIRECTION_OUT;
51 return GPIO_LINE_DIRECTION_IN;
54 static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
58 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
60 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
61 pin_reg = readl(gpio_dev->base + offset * 4);
62 pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
63 writel(pin_reg, gpio_dev->base + offset * 4);
64 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
69 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
74 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
76 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
77 pin_reg = readl(gpio_dev->base + offset * 4);
78 pin_reg |= BIT(OUTPUT_ENABLE_OFF);
80 pin_reg |= BIT(OUTPUT_VALUE_OFF);
82 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
83 writel(pin_reg, gpio_dev->base + offset * 4);
84 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
89 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
93 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
95 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
96 pin_reg = readl(gpio_dev->base + offset * 4);
97 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
99 return !!(pin_reg & BIT(PIN_STS_OFF));
102 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
106 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
108 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
109 pin_reg = readl(gpio_dev->base + offset * 4);
111 pin_reg |= BIT(OUTPUT_VALUE_OFF);
113 pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
114 writel(pin_reg, gpio_dev->base + offset * 4);
115 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
118 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
125 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
127 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
129 /* Use special handling for Pin0 debounce */
130 pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
131 if (pin_reg & INTERNAL_GPIO0_DEBOUNCE)
134 pin_reg = readl(gpio_dev->base + offset * 4);
137 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
138 pin_reg &= ~DB_TMR_OUT_MASK;
140 Debounce Debounce Timer Max
141 TmrLarge TmrOutUnit Unit Debounce
143 0 0 61 usec (2 RtcClk) 976 usec
144 0 1 244 usec (8 RtcClk) 3.9 msec
145 1 0 15.6 msec (512 RtcClk) 250 msec
146 1 1 62.5 msec (2048 RtcClk) 1 sec
151 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
152 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
153 } else if (debounce < 976) {
154 time = debounce / 61;
155 pin_reg |= time & DB_TMR_OUT_MASK;
156 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
157 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
158 } else if (debounce < 3900) {
159 time = debounce / 244;
160 pin_reg |= time & DB_TMR_OUT_MASK;
161 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
162 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
163 } else if (debounce < 250000) {
164 time = debounce / 15625;
165 pin_reg |= time & DB_TMR_OUT_MASK;
166 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
167 pin_reg |= BIT(DB_TMR_LARGE_OFF);
168 } else if (debounce < 1000000) {
169 time = debounce / 62500;
170 pin_reg |= time & DB_TMR_OUT_MASK;
171 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
172 pin_reg |= BIT(DB_TMR_LARGE_OFF);
174 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
178 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
179 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
180 pin_reg &= ~DB_TMR_OUT_MASK;
181 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
183 writel(pin_reg, gpio_dev->base + offset * 4);
184 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
189 static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset,
190 unsigned long config)
194 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
197 debounce = pinconf_to_config_argument(config);
198 return amd_gpio_set_debounce(gc, offset, debounce);
201 #ifdef CONFIG_DEBUG_FS
202 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
207 unsigned int bank, i, pin_num;
208 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
215 char *interrupt_mask;
224 char debounce_value[40];
225 char *debounce_enable;
228 seq_printf(s, "WAKE_INT_MASTER_REG: 0x%08x\n", readl(gpio_dev->base + WAKE_INT_MASTER_REG));
229 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
230 unsigned int time = 0;
231 unsigned int unit = 0;
236 pin_num = AMD_GPIO_PINS_BANK0;
240 pin_num = AMD_GPIO_PINS_BANK1 + i;
244 pin_num = AMD_GPIO_PINS_BANK2 + i;
248 pin_num = AMD_GPIO_PINS_BANK3 + i;
251 /* Illegal bank number, ignore */
254 seq_printf(s, "GPIO bank%d\n", bank);
255 seq_puts(s, "gpio\t int|active|trigger|S0i3| S3|S4/S5| Z|wake|pull| orient| debounce|reg\n");
256 for (; i < pin_num; i++) {
257 seq_printf(s, "#%d\t", i);
258 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
259 pin_reg = readl(gpio_dev->base + i * 4);
260 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
262 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
263 u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
266 if (level == ACTIVE_LEVEL_HIGH)
268 else if (level == ACTIVE_LEVEL_LOW)
270 else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
271 level == ACTIVE_LEVEL_BOTH)
276 if (pin_reg & BIT(LEVEL_TRIG_OFF))
277 level_trig = "level";
279 level_trig = " edge";
281 if (pin_reg & BIT(INTERRUPT_MASK_OFF))
282 interrupt_mask = "😛";
284 interrupt_mask = "😷";
286 if (pin_reg & BIT(INTERRUPT_STS_OFF))
291 seq_printf(s, "%s %s| %s| %s|",
297 seq_puts(s, " ∅| | |");
299 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
303 seq_printf(s, " %s| ", wake_cntrl0);
305 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
309 seq_printf(s, "%s|", wake_cntrl1);
311 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
315 seq_printf(s, " %s|", wake_cntrl2);
317 if (pin_reg & BIT(WAKECNTRL_Z_OFF))
321 seq_printf(s, "%s|", wake_cntrlz);
323 if (pin_reg & BIT(WAKE_STS_OFF))
327 seq_printf(s, " %s|", wake_sts);
329 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
330 if (pin_reg & BIT(PULL_UP_SEL_OFF))
334 seq_printf(s, "%s ↑|",
336 } else if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) {
342 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
344 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
350 if (pin_reg & BIT(PIN_STS_OFF))
355 seq_printf(s, "%s %s|", pin_sts, orientation);
357 db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
359 tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
360 tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
361 time = pin_reg & DB_TMR_OUT_MASK;
373 if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
374 debounce_enable = "b";
375 else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
376 debounce_enable = "↓";
378 debounce_enable = "↑";
379 snprintf(debounce_value, sizeof(debounce_value), "%06u", time * unit);
380 seq_printf(s, "%s (🕑 %sus)|", debounce_enable, debounce_value);
384 seq_printf(s, "0x%x\n", pin_reg);
389 #define amd_gpio_dbg_show NULL
392 static void amd_gpio_irq_enable(struct irq_data *d)
396 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
397 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
399 gpiochip_enable_irq(gc, d->hwirq);
401 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
402 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
403 pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
404 pin_reg |= BIT(INTERRUPT_MASK_OFF);
405 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
406 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
409 static void amd_gpio_irq_disable(struct irq_data *d)
413 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
414 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
416 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
417 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
418 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
419 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
420 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
421 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
423 gpiochip_disable_irq(gc, d->hwirq);
426 static void amd_gpio_irq_mask(struct irq_data *d)
430 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
431 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
433 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
434 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
435 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
436 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
437 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
440 static void amd_gpio_irq_unmask(struct irq_data *d)
444 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
445 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
447 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
448 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
449 pin_reg |= BIT(INTERRUPT_MASK_OFF);
450 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
451 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
454 static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
458 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
459 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
460 u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3);
463 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
464 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
467 pin_reg |= wake_mask;
469 pin_reg &= ~wake_mask;
471 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
472 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
475 err = enable_irq_wake(gpio_dev->irq);
477 err = disable_irq_wake(gpio_dev->irq);
480 dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n",
481 on ? "enable" : "disable");
486 static void amd_gpio_irq_eoi(struct irq_data *d)
490 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
491 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
493 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
494 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
496 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
497 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
500 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
503 u32 pin_reg, pin_reg_irq_en, mask;
505 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
506 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
508 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
509 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
511 switch (type & IRQ_TYPE_SENSE_MASK) {
512 case IRQ_TYPE_EDGE_RISING:
513 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
514 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
515 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
516 irq_set_handler_locked(d, handle_edge_irq);
519 case IRQ_TYPE_EDGE_FALLING:
520 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
521 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
522 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
523 irq_set_handler_locked(d, handle_edge_irq);
526 case IRQ_TYPE_EDGE_BOTH:
527 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
528 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
529 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
530 irq_set_handler_locked(d, handle_edge_irq);
533 case IRQ_TYPE_LEVEL_HIGH:
534 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
535 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
536 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
537 irq_set_handler_locked(d, handle_level_irq);
540 case IRQ_TYPE_LEVEL_LOW:
541 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
542 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
543 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
544 irq_set_handler_locked(d, handle_level_irq);
551 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
555 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
557 * If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the
558 * debounce registers of any GPIO will block wake/interrupt status
559 * generation for *all* GPIOs for a length of time that depends on
560 * WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the
561 * INTERRUPT_ENABLE bit will read as 0.
563 * We temporarily enable irq for the GPIO whose configuration is
564 * changing, and then wait for it to read back as 1 to know when
565 * debounce has settled and then disable the irq again.
566 * We do this polling with the spinlock held to ensure other GPIO
567 * access routines do not read an incorrect value for the irq enable
568 * bit of other GPIOs. We keep the GPIO masked while polling to avoid
569 * spurious irqs, and disable the irq again after polling.
571 mask = BIT(INTERRUPT_ENABLE_OFF);
572 pin_reg_irq_en = pin_reg;
573 pin_reg_irq_en |= mask;
574 pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF);
575 writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4);
576 while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask)
578 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
579 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
584 static void amd_irq_ack(struct irq_data *d)
587 * based on HW design,there is no need to ack HW
588 * before handle current irq. But this routine is
589 * necessary for handle_edge_irq
593 static const struct irq_chip amd_gpio_irqchip = {
595 .irq_ack = amd_irq_ack,
596 .irq_enable = amd_gpio_irq_enable,
597 .irq_disable = amd_gpio_irq_disable,
598 .irq_mask = amd_gpio_irq_mask,
599 .irq_unmask = amd_gpio_irq_unmask,
600 .irq_set_wake = amd_gpio_irq_set_wake,
601 .irq_eoi = amd_gpio_irq_eoi,
602 .irq_set_type = amd_gpio_irq_set_type,
604 * We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
605 * also generates an IRQ. We need the IRQ so the irq_handler can clear
606 * the wake event. Otherwise the wake event will never clear and
607 * prevent the system from suspending.
609 .flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
610 GPIOCHIP_IRQ_RESOURCE_HELPERS,
613 #define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
615 static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
617 struct amd_gpio *gpio_dev = dev_id;
618 struct gpio_chip *gc = &gpio_dev->gc;
619 unsigned int i, irqnr;
626 /* Read the wake status */
627 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
628 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
630 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
631 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
633 /* Bit 0-45 contain the relevant status bits */
634 status &= (1ULL << 46) - 1;
635 regs = gpio_dev->base;
636 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
637 if (!(status & mask))
641 /* Each status bit covers four pins */
642 for (i = 0; i < 4; i++) {
643 regval = readl(regs + i);
645 if (regval & PIN_IRQ_PENDING)
646 dev_dbg(&gpio_dev->pdev->dev,
647 "GPIO %d is active: 0x%x",
650 /* caused wake on resume context for shared IRQ */
651 if (irq < 0 && (regval & BIT(WAKE_STS_OFF)))
654 if (!(regval & PIN_IRQ_PENDING) ||
655 !(regval & BIT(INTERRUPT_MASK_OFF)))
657 generic_handle_domain_irq_safe(gc->irq.domain, irqnr + i);
660 * We must read the pin register again, in case the
661 * value was changed while executing
662 * generic_handle_domain_irq() above.
663 * If we didn't find a mapping for the interrupt,
664 * disable it in order to avoid a system hang caused
665 * by an interrupt storm.
667 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
668 regval = readl(regs + i);
670 regval &= ~BIT(INTERRUPT_ENABLE_OFF);
671 dev_dbg(&gpio_dev->pdev->dev,
672 "Disabling spurious GPIO IRQ %d\n",
675 writel(regval, regs + i);
676 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
680 /* did not cause wake on resume context for shared IRQ */
684 /* Signal EOI to the GPIO unit */
685 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
686 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
688 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
689 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
694 static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
696 return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
699 static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
701 return do_amd_gpio_irq_handler(-1, dev_id);
704 static int amd_get_groups_count(struct pinctrl_dev *pctldev)
706 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
708 return gpio_dev->ngroups;
711 static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
714 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
716 return gpio_dev->groups[group].name;
719 static int amd_get_group_pins(struct pinctrl_dev *pctldev,
721 const unsigned **pins,
724 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
726 *pins = gpio_dev->groups[group].pins;
727 *num_pins = gpio_dev->groups[group].npins;
731 static const struct pinctrl_ops amd_pinctrl_ops = {
732 .get_groups_count = amd_get_groups_count,
733 .get_group_name = amd_get_group_name,
734 .get_group_pins = amd_get_group_pins,
736 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
737 .dt_free_map = pinctrl_utils_free_map,
741 static int amd_pinconf_get(struct pinctrl_dev *pctldev,
743 unsigned long *config)
748 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
749 enum pin_config_param param = pinconf_to_config_param(*config);
751 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
752 pin_reg = readl(gpio_dev->base + pin*4);
753 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
755 case PIN_CONFIG_INPUT_DEBOUNCE:
756 arg = pin_reg & DB_TMR_OUT_MASK;
759 case PIN_CONFIG_BIAS_PULL_DOWN:
760 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
763 case PIN_CONFIG_BIAS_PULL_UP:
764 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
767 case PIN_CONFIG_DRIVE_STRENGTH:
768 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
772 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
777 *config = pinconf_to_config_packed(param, arg);
782 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
783 unsigned long *configs, unsigned num_configs)
790 enum pin_config_param param;
791 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
793 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
794 for (i = 0; i < num_configs; i++) {
795 param = pinconf_to_config_param(configs[i]);
796 arg = pinconf_to_config_argument(configs[i]);
797 pin_reg = readl(gpio_dev->base + pin*4);
800 case PIN_CONFIG_INPUT_DEBOUNCE:
801 pin_reg &= ~DB_TMR_OUT_MASK;
802 pin_reg |= arg & DB_TMR_OUT_MASK;
805 case PIN_CONFIG_BIAS_PULL_DOWN:
806 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
807 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
810 case PIN_CONFIG_BIAS_PULL_UP:
811 pin_reg &= ~BIT(PULL_UP_SEL_OFF);
812 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
813 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
814 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
817 case PIN_CONFIG_DRIVE_STRENGTH:
818 pin_reg &= ~(DRV_STRENGTH_SEL_MASK
819 << DRV_STRENGTH_SEL_OFF);
820 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
821 << DRV_STRENGTH_SEL_OFF;
825 dev_err(&gpio_dev->pdev->dev,
826 "Invalid config param %04x\n", param);
830 writel(pin_reg, gpio_dev->base + pin*4);
832 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
837 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
839 unsigned long *config)
841 const unsigned *pins;
845 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
849 if (amd_pinconf_get(pctldev, pins[0], config))
855 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
856 unsigned group, unsigned long *configs,
857 unsigned num_configs)
859 const unsigned *pins;
863 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
866 for (i = 0; i < npins; i++) {
867 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
873 static const struct pinconf_ops amd_pinconf_ops = {
874 .pin_config_get = amd_pinconf_get,
875 .pin_config_set = amd_pinconf_set,
876 .pin_config_group_get = amd_pinconf_group_get,
877 .pin_config_group_set = amd_pinconf_group_set,
880 static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
882 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
887 mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
888 BIT(INTERRUPT_MASK_OFF) | BIT(INTERRUPT_ENABLE_OFF) |
889 BIT(WAKE_CNTRL_OFF_S4);
891 for (i = 0; i < desc->npins; i++) {
892 int pin = desc->pins[i].number;
893 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
898 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
900 pin_reg = readl(gpio_dev->base + pin * 4);
902 writel(pin_reg, gpio_dev->base + pin * 4);
904 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
908 #ifdef CONFIG_PM_SLEEP
909 static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
911 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
917 * Only restore the pin if it is actually in use by the kernel (or
920 if (pd->mux_owner || pd->gpio_owner ||
921 gpiochip_line_is_irq(&gpio_dev->gc, pin))
927 static int amd_gpio_suspend(struct device *dev)
929 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
930 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
934 for (i = 0; i < desc->npins; i++) {
935 int pin = desc->pins[i].number;
937 if (!amd_gpio_should_save(gpio_dev, pin))
940 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
941 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
942 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
948 static int amd_gpio_resume(struct device *dev)
950 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
951 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
955 for (i = 0; i < desc->npins; i++) {
956 int pin = desc->pins[i].number;
958 if (!amd_gpio_should_save(gpio_dev, pin))
961 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
962 gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING;
963 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4);
964 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
970 static const struct dev_pm_ops amd_gpio_pm_ops = {
971 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
976 static int amd_get_functions_count(struct pinctrl_dev *pctldev)
978 return ARRAY_SIZE(pmx_functions);
981 static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector)
983 return pmx_functions[selector].name;
986 static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector,
987 const char * const **groups,
988 unsigned int * const num_groups)
990 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
992 if (!gpio_dev->iomux_base) {
993 dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector);
997 *groups = pmx_functions[selector].groups;
998 *num_groups = pmx_functions[selector].ngroups;
1002 static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group)
1004 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
1005 struct device *dev = &gpio_dev->pdev->dev;
1006 struct pin_desc *pd;
1009 if (!gpio_dev->iomux_base)
1012 for (index = 0; index < NSELECTS; index++) {
1013 if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index]))
1016 if (readb(gpio_dev->iomux_base + pmx_functions[function].index) ==
1018 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
1019 pmx_functions[function].index);
1023 writeb(index, gpio_dev->iomux_base + pmx_functions[function].index);
1025 if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) &
1027 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
1028 pmx_functions[function].index);
1032 for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) {
1033 if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F")))
1036 pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]);
1037 pd->mux_owner = gpio_dev->groups[group].name;
1045 static const struct pinmux_ops amd_pmxops = {
1046 .get_functions_count = amd_get_functions_count,
1047 .get_function_name = amd_get_fname,
1048 .get_function_groups = amd_get_groups,
1049 .set_mux = amd_set_mux,
1052 static struct pinctrl_desc amd_pinctrl_desc = {
1053 .pins = kerncz_pins,
1054 .npins = ARRAY_SIZE(kerncz_pins),
1055 .pctlops = &amd_pinctrl_ops,
1056 .pmxops = &amd_pmxops,
1057 .confops = &amd_pinconf_ops,
1058 .owner = THIS_MODULE,
1061 static void amd_get_iomux_res(struct amd_gpio *gpio_dev)
1063 struct pinctrl_desc *desc = &amd_pinctrl_desc;
1064 struct device *dev = &gpio_dev->pdev->dev;
1067 index = device_property_match_string(dev, "pinctrl-resource-names", "iomux");
1069 dev_dbg(dev, "iomux not supported\n");
1073 gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index);
1074 if (IS_ERR(gpio_dev->iomux_base)) {
1075 dev_dbg(dev, "iomux not supported %d io resource\n", index);
1082 desc->pmxops = NULL;
1085 static int amd_gpio_probe(struct platform_device *pdev)
1088 struct resource *res;
1089 struct amd_gpio *gpio_dev;
1090 struct gpio_irq_chip *girq;
1092 gpio_dev = devm_kzalloc(&pdev->dev,
1093 sizeof(struct amd_gpio), GFP_KERNEL);
1097 raw_spin_lock_init(&gpio_dev->lock);
1099 gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1100 if (IS_ERR(gpio_dev->base)) {
1101 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
1102 return PTR_ERR(gpio_dev->base);
1105 gpio_dev->irq = platform_get_irq(pdev, 0);
1106 if (gpio_dev->irq < 0)
1107 return gpio_dev->irq;
1109 #ifdef CONFIG_PM_SLEEP
1110 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
1111 sizeof(*gpio_dev->saved_regs),
1113 if (!gpio_dev->saved_regs)
1117 gpio_dev->pdev = pdev;
1118 gpio_dev->gc.get_direction = amd_gpio_get_direction;
1119 gpio_dev->gc.direction_input = amd_gpio_direction_input;
1120 gpio_dev->gc.direction_output = amd_gpio_direction_output;
1121 gpio_dev->gc.get = amd_gpio_get_value;
1122 gpio_dev->gc.set = amd_gpio_set_value;
1123 gpio_dev->gc.set_config = amd_gpio_set_config;
1124 gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
1126 gpio_dev->gc.base = -1;
1127 gpio_dev->gc.label = pdev->name;
1128 gpio_dev->gc.owner = THIS_MODULE;
1129 gpio_dev->gc.parent = &pdev->dev;
1130 gpio_dev->gc.ngpio = resource_size(res) / 4;
1132 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
1133 gpio_dev->groups = kerncz_groups;
1134 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
1136 amd_pinctrl_desc.name = dev_name(&pdev->dev);
1137 amd_get_iomux_res(gpio_dev);
1138 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
1140 if (IS_ERR(gpio_dev->pctrl)) {
1141 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
1142 return PTR_ERR(gpio_dev->pctrl);
1145 /* Disable and mask interrupts */
1146 amd_gpio_irq_init(gpio_dev);
1148 girq = &gpio_dev->gc.irq;
1149 gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
1150 /* This will let us handle the parent IRQ in the driver */
1151 girq->parent_handler = NULL;
1152 girq->num_parents = 0;
1153 girq->parents = NULL;
1154 girq->default_type = IRQ_TYPE_NONE;
1155 girq->handler = handle_simple_irq;
1157 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
1161 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
1162 0, 0, gpio_dev->gc.ngpio);
1164 dev_err(&pdev->dev, "Failed to add pin range\n");
1168 ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler,
1169 IRQF_SHARED, KBUILD_MODNAME, gpio_dev);
1173 platform_set_drvdata(pdev, gpio_dev);
1174 acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
1176 dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
1180 gpiochip_remove(&gpio_dev->gc);
1185 static int amd_gpio_remove(struct platform_device *pdev)
1187 struct amd_gpio *gpio_dev;
1189 gpio_dev = platform_get_drvdata(pdev);
1191 gpiochip_remove(&gpio_dev->gc);
1192 acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
1198 static const struct acpi_device_id amd_gpio_acpi_match[] = {
1204 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
1207 static struct platform_driver amd_gpio_driver = {
1210 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
1211 #ifdef CONFIG_PM_SLEEP
1212 .pm = &amd_gpio_pm_ops,
1215 .probe = amd_gpio_probe,
1216 .remove = amd_gpio_remove,
1219 module_platform_driver(amd_gpio_driver);
1221 MODULE_LICENSE("GPL v2");
1222 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
1223 MODULE_DESCRIPTION("AMD GPIO pinctrl driver");