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);
128 pin_reg = readl(gpio_dev->base + offset * 4);
131 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
132 pin_reg &= ~DB_TMR_OUT_MASK;
134 Debounce Debounce Timer Max
135 TmrLarge TmrOutUnit Unit Debounce
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
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 / 15625;
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);
168 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
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 << DB_CNTRL_OFF);
177 writel(pin_reg, gpio_dev->base + offset * 4);
178 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
183 static int amd_gpio_set_config(struct gpio_chip *gc, unsigned offset,
184 unsigned long config)
188 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
191 debounce = pinconf_to_config_argument(config);
192 return amd_gpio_set_debounce(gc, offset, debounce);
195 #ifdef CONFIG_DEBUG_FS
196 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
201 unsigned int bank, i, pin_num;
202 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
209 char *interrupt_enable;
210 char *interrupt_mask;
216 char *pull_up_enable;
217 char *pull_down_enable;
219 char debounce_value[40];
220 char *debounce_enable;
222 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
223 unsigned int time = 0;
224 unsigned int unit = 0;
229 pin_num = AMD_GPIO_PINS_BANK0;
233 pin_num = AMD_GPIO_PINS_BANK1 + i;
237 pin_num = AMD_GPIO_PINS_BANK2 + i;
241 pin_num = AMD_GPIO_PINS_BANK3 + i;
244 /* Illegal bank number, ignore */
247 seq_printf(s, "GPIO bank%d\n", bank);
248 for (; i < pin_num; i++) {
249 seq_printf(s, "📌%d\t", i);
250 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
251 pin_reg = readl(gpio_dev->base + i * 4);
252 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
254 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
255 u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
257 interrupt_enable = "+";
259 if (level == ACTIVE_LEVEL_HIGH)
261 else if (level == ACTIVE_LEVEL_LOW)
263 else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
264 level == ACTIVE_LEVEL_BOTH)
269 if (pin_reg & BIT(LEVEL_TRIG_OFF))
270 level_trig = "level";
272 level_trig = " edge";
275 interrupt_enable = "∅";
280 if (pin_reg & BIT(INTERRUPT_MASK_OFF))
281 interrupt_mask = "-";
283 interrupt_mask = "+";
284 seq_printf(s, "int %s (🎭 %s)| active-%s| %s-🔫| ",
290 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
294 seq_printf(s, "S0i3 🌅 %s| ", wake_cntrl0);
296 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
300 seq_printf(s, "S3 🌅 %s| ", wake_cntrl1);
302 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
306 seq_printf(s, "S4/S5 🌅 %s| ", wake_cntrl2);
308 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
309 pull_up_enable = "+";
310 if (pin_reg & BIT(PULL_UP_SEL_OFF))
315 pull_up_enable = "∅";
318 seq_printf(s, "pull-↑ %s (%s)| ",
322 if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF))
323 pull_down_enable = "+";
325 pull_down_enable = "∅";
326 seq_printf(s, "pull-↓ %s| ", pull_down_enable);
328 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
330 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
336 if (pin_reg & BIT(PIN_STS_OFF))
341 seq_printf(s, "%s %s| ", pin_sts, orientation);
343 db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
345 tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
346 tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
347 time = pin_reg & DB_TMR_OUT_MASK;
359 if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
360 debounce_enable = "b +";
361 else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
362 debounce_enable = "↓ +";
364 debounce_enable = "↑ +";
367 debounce_enable = " ∅";
369 snprintf(debounce_value, sizeof(debounce_value), "%u", time * unit);
370 seq_printf(s, "debounce %s (⏰ %sus)| ", debounce_enable, debounce_value);
371 seq_printf(s, " 0x%x\n", pin_reg);
376 #define amd_gpio_dbg_show NULL
379 static void amd_gpio_irq_enable(struct irq_data *d)
383 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
384 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
386 gpiochip_enable_irq(gc, d->hwirq);
388 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
389 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
390 pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
391 pin_reg |= BIT(INTERRUPT_MASK_OFF);
392 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
393 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
396 static void amd_gpio_irq_disable(struct irq_data *d)
400 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
401 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
403 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
404 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
405 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
406 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
407 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
408 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
410 gpiochip_disable_irq(gc, d->hwirq);
413 static void amd_gpio_irq_mask(struct irq_data *d)
417 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
418 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
420 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
421 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
422 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
423 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
424 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
427 static void amd_gpio_irq_unmask(struct irq_data *d)
431 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
432 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
434 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
435 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
436 pin_reg |= BIT(INTERRUPT_MASK_OFF);
437 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
438 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
441 static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
445 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
446 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
447 u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3);
450 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
451 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
454 pin_reg |= wake_mask;
456 pin_reg &= ~wake_mask;
458 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
459 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
462 err = enable_irq_wake(gpio_dev->irq);
464 err = disable_irq_wake(gpio_dev->irq);
467 dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n",
468 on ? "enable" : "disable");
473 static void amd_gpio_irq_eoi(struct irq_data *d)
477 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
478 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
480 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
481 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
483 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
484 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
487 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
490 u32 pin_reg, pin_reg_irq_en, mask;
492 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
493 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
495 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
496 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
498 switch (type & IRQ_TYPE_SENSE_MASK) {
499 case IRQ_TYPE_EDGE_RISING:
500 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
501 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
502 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
503 irq_set_handler_locked(d, handle_edge_irq);
506 case IRQ_TYPE_EDGE_FALLING:
507 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
508 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
509 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
510 irq_set_handler_locked(d, handle_edge_irq);
513 case IRQ_TYPE_EDGE_BOTH:
514 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
515 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
516 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
517 irq_set_handler_locked(d, handle_edge_irq);
520 case IRQ_TYPE_LEVEL_HIGH:
521 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
522 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
523 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
524 irq_set_handler_locked(d, handle_level_irq);
527 case IRQ_TYPE_LEVEL_LOW:
528 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
529 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
530 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
531 irq_set_handler_locked(d, handle_level_irq);
538 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
542 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
544 * If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the
545 * debounce registers of any GPIO will block wake/interrupt status
546 * generation for *all* GPIOs for a length of time that depends on
547 * WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the
548 * INTERRUPT_ENABLE bit will read as 0.
550 * We temporarily enable irq for the GPIO whose configuration is
551 * changing, and then wait for it to read back as 1 to know when
552 * debounce has settled and then disable the irq again.
553 * We do this polling with the spinlock held to ensure other GPIO
554 * access routines do not read an incorrect value for the irq enable
555 * bit of other GPIOs. We keep the GPIO masked while polling to avoid
556 * spurious irqs, and disable the irq again after polling.
558 mask = BIT(INTERRUPT_ENABLE_OFF);
559 pin_reg_irq_en = pin_reg;
560 pin_reg_irq_en |= mask;
561 pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF);
562 writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4);
563 while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask)
565 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
566 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
571 static void amd_irq_ack(struct irq_data *d)
574 * based on HW design,there is no need to ack HW
575 * before handle current irq. But this routine is
576 * necessary for handle_edge_irq
580 static const struct irq_chip amd_gpio_irqchip = {
582 .irq_ack = amd_irq_ack,
583 .irq_enable = amd_gpio_irq_enable,
584 .irq_disable = amd_gpio_irq_disable,
585 .irq_mask = amd_gpio_irq_mask,
586 .irq_unmask = amd_gpio_irq_unmask,
587 .irq_set_wake = amd_gpio_irq_set_wake,
588 .irq_eoi = amd_gpio_irq_eoi,
589 .irq_set_type = amd_gpio_irq_set_type,
591 * We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
592 * also generates an IRQ. We need the IRQ so the irq_handler can clear
593 * the wake event. Otherwise the wake event will never clear and
594 * prevent the system from suspending.
596 .flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
597 GPIOCHIP_IRQ_RESOURCE_HELPERS,
600 #define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
602 static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
604 struct amd_gpio *gpio_dev = dev_id;
605 struct gpio_chip *gc = &gpio_dev->gc;
606 unsigned int i, irqnr;
613 /* Read the wake status */
614 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
615 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
617 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
618 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
620 /* Bit 0-45 contain the relevant status bits */
621 status &= (1ULL << 46) - 1;
622 regs = gpio_dev->base;
623 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
624 if (!(status & mask))
628 /* Each status bit covers four pins */
629 for (i = 0; i < 4; i++) {
630 regval = readl(regs + i);
631 /* caused wake on resume context for shared IRQ */
632 if (irq < 0 && (regval & BIT(WAKE_STS_OFF))) {
633 dev_dbg(&gpio_dev->pdev->dev,
634 "Waking due to GPIO %d: 0x%x",
639 if (!(regval & PIN_IRQ_PENDING) ||
640 !(regval & BIT(INTERRUPT_MASK_OFF)))
642 generic_handle_domain_irq(gc->irq.domain, irqnr + i);
645 * We must read the pin register again, in case the
646 * value was changed while executing
647 * generic_handle_domain_irq() above.
648 * If we didn't find a mapping for the interrupt,
649 * disable it in order to avoid a system hang caused
650 * by an interrupt storm.
652 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
653 regval = readl(regs + i);
655 regval &= ~BIT(INTERRUPT_ENABLE_OFF);
656 dev_dbg(&gpio_dev->pdev->dev,
657 "Disabling spurious GPIO IRQ %d\n",
660 writel(regval, regs + i);
661 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
665 /* did not cause wake on resume context for shared IRQ */
669 /* Signal EOI to the GPIO unit */
670 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
671 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
673 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
674 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
679 static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
681 return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
684 static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
686 return do_amd_gpio_irq_handler(-1, dev_id);
689 static int amd_get_groups_count(struct pinctrl_dev *pctldev)
691 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
693 return gpio_dev->ngroups;
696 static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
699 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
701 return gpio_dev->groups[group].name;
704 static int amd_get_group_pins(struct pinctrl_dev *pctldev,
706 const unsigned **pins,
709 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
711 *pins = gpio_dev->groups[group].pins;
712 *num_pins = gpio_dev->groups[group].npins;
716 static const struct pinctrl_ops amd_pinctrl_ops = {
717 .get_groups_count = amd_get_groups_count,
718 .get_group_name = amd_get_group_name,
719 .get_group_pins = amd_get_group_pins,
721 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
722 .dt_free_map = pinctrl_utils_free_map,
726 static int amd_pinconf_get(struct pinctrl_dev *pctldev,
728 unsigned long *config)
733 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
734 enum pin_config_param param = pinconf_to_config_param(*config);
736 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
737 pin_reg = readl(gpio_dev->base + pin*4);
738 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
740 case PIN_CONFIG_INPUT_DEBOUNCE:
741 arg = pin_reg & DB_TMR_OUT_MASK;
744 case PIN_CONFIG_BIAS_PULL_DOWN:
745 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
748 case PIN_CONFIG_BIAS_PULL_UP:
749 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
752 case PIN_CONFIG_DRIVE_STRENGTH:
753 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
757 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
762 *config = pinconf_to_config_packed(param, arg);
767 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
768 unsigned long *configs, unsigned num_configs)
775 enum pin_config_param param;
776 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
778 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
779 for (i = 0; i < num_configs; i++) {
780 param = pinconf_to_config_param(configs[i]);
781 arg = pinconf_to_config_argument(configs[i]);
782 pin_reg = readl(gpio_dev->base + pin*4);
785 case PIN_CONFIG_INPUT_DEBOUNCE:
786 pin_reg &= ~DB_TMR_OUT_MASK;
787 pin_reg |= arg & DB_TMR_OUT_MASK;
790 case PIN_CONFIG_BIAS_PULL_DOWN:
791 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
792 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
795 case PIN_CONFIG_BIAS_PULL_UP:
796 pin_reg &= ~BIT(PULL_UP_SEL_OFF);
797 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
798 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
799 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
802 case PIN_CONFIG_DRIVE_STRENGTH:
803 pin_reg &= ~(DRV_STRENGTH_SEL_MASK
804 << DRV_STRENGTH_SEL_OFF);
805 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
806 << DRV_STRENGTH_SEL_OFF;
810 dev_err(&gpio_dev->pdev->dev,
811 "Invalid config param %04x\n", param);
815 writel(pin_reg, gpio_dev->base + pin*4);
817 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
822 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
824 unsigned long *config)
826 const unsigned *pins;
830 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
834 if (amd_pinconf_get(pctldev, pins[0], config))
840 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
841 unsigned group, unsigned long *configs,
842 unsigned num_configs)
844 const unsigned *pins;
848 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
851 for (i = 0; i < npins; i++) {
852 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
858 static 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,
865 static void amd_gpio_irq_init(struct amd_gpio *gpio_dev)
867 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
872 mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3) |
873 BIT(INTERRUPT_MASK_OFF) | BIT(INTERRUPT_ENABLE_OFF) |
874 BIT(WAKE_CNTRL_OFF_S4);
876 for (i = 0; i < desc->npins; i++) {
877 int pin = desc->pins[i].number;
878 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
883 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
885 pin_reg = readl(gpio_dev->base + i * 4);
887 writel(pin_reg, gpio_dev->base + i * 4);
889 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
893 #ifdef CONFIG_PM_SLEEP
894 static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
896 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
902 * Only restore the pin if it is actually in use by the kernel (or
905 if (pd->mux_owner || pd->gpio_owner ||
906 gpiochip_line_is_irq(&gpio_dev->gc, pin))
912 static int amd_gpio_suspend(struct device *dev)
914 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
915 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
919 for (i = 0; i < desc->npins; i++) {
920 int pin = desc->pins[i].number;
922 if (!amd_gpio_should_save(gpio_dev, pin))
925 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
926 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
927 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
933 static int amd_gpio_resume(struct device *dev)
935 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
936 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
940 for (i = 0; i < desc->npins; i++) {
941 int pin = desc->pins[i].number;
943 if (!amd_gpio_should_save(gpio_dev, pin))
946 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
947 gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING;
948 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4);
949 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
955 static const struct dev_pm_ops amd_gpio_pm_ops = {
956 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
961 static int amd_get_functions_count(struct pinctrl_dev *pctldev)
963 return ARRAY_SIZE(pmx_functions);
966 static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector)
968 return pmx_functions[selector].name;
971 static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector,
972 const char * const **groups,
973 unsigned int * const num_groups)
975 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
977 if (!gpio_dev->iomux_base) {
978 dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector);
982 *groups = pmx_functions[selector].groups;
983 *num_groups = pmx_functions[selector].ngroups;
987 static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group)
989 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
990 struct device *dev = &gpio_dev->pdev->dev;
994 if (!gpio_dev->iomux_base)
997 for (index = 0; index < NSELECTS; index++) {
998 if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index]))
1001 if (readb(gpio_dev->iomux_base + pmx_functions[function].index) ==
1003 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
1004 pmx_functions[function].index);
1008 writeb(index, gpio_dev->iomux_base + pmx_functions[function].index);
1010 if (index != (readb(gpio_dev->iomux_base + pmx_functions[function].index) &
1012 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
1013 pmx_functions[function].index);
1017 for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) {
1018 if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F")))
1021 pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]);
1022 pd->mux_owner = gpio_dev->groups[group].name;
1030 static const struct pinmux_ops amd_pmxops = {
1031 .get_functions_count = amd_get_functions_count,
1032 .get_function_name = amd_get_fname,
1033 .get_function_groups = amd_get_groups,
1034 .set_mux = amd_set_mux,
1037 static struct pinctrl_desc amd_pinctrl_desc = {
1038 .pins = kerncz_pins,
1039 .npins = ARRAY_SIZE(kerncz_pins),
1040 .pctlops = &amd_pinctrl_ops,
1041 .pmxops = &amd_pmxops,
1042 .confops = &amd_pinconf_ops,
1043 .owner = THIS_MODULE,
1046 static void amd_get_iomux_res(struct amd_gpio *gpio_dev)
1048 struct pinctrl_desc *desc = &amd_pinctrl_desc;
1049 struct device *dev = &gpio_dev->pdev->dev;
1052 index = device_property_match_string(dev, "pinctrl-resource-names", "iomux");
1054 dev_warn(dev, "failed to get iomux index\n");
1058 gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index);
1059 if (IS_ERR(gpio_dev->iomux_base)) {
1060 dev_warn(dev, "Failed to get iomux %d io resource\n", index);
1067 desc->pmxops = NULL;
1070 static int amd_gpio_probe(struct platform_device *pdev)
1073 struct resource *res;
1074 struct amd_gpio *gpio_dev;
1075 struct gpio_irq_chip *girq;
1077 gpio_dev = devm_kzalloc(&pdev->dev,
1078 sizeof(struct amd_gpio), GFP_KERNEL);
1082 raw_spin_lock_init(&gpio_dev->lock);
1084 gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1085 if (IS_ERR(gpio_dev->base)) {
1086 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
1087 return PTR_ERR(gpio_dev->base);
1090 gpio_dev->irq = platform_get_irq(pdev, 0);
1091 if (gpio_dev->irq < 0)
1092 return gpio_dev->irq;
1094 #ifdef CONFIG_PM_SLEEP
1095 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
1096 sizeof(*gpio_dev->saved_regs),
1098 if (!gpio_dev->saved_regs)
1102 gpio_dev->pdev = pdev;
1103 gpio_dev->gc.get_direction = amd_gpio_get_direction;
1104 gpio_dev->gc.direction_input = amd_gpio_direction_input;
1105 gpio_dev->gc.direction_output = amd_gpio_direction_output;
1106 gpio_dev->gc.get = amd_gpio_get_value;
1107 gpio_dev->gc.set = amd_gpio_set_value;
1108 gpio_dev->gc.set_config = amd_gpio_set_config;
1109 gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
1111 gpio_dev->gc.base = -1;
1112 gpio_dev->gc.label = pdev->name;
1113 gpio_dev->gc.owner = THIS_MODULE;
1114 gpio_dev->gc.parent = &pdev->dev;
1115 gpio_dev->gc.ngpio = resource_size(res) / 4;
1117 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
1118 gpio_dev->groups = kerncz_groups;
1119 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
1121 amd_pinctrl_desc.name = dev_name(&pdev->dev);
1122 amd_get_iomux_res(gpio_dev);
1123 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
1125 if (IS_ERR(gpio_dev->pctrl)) {
1126 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
1127 return PTR_ERR(gpio_dev->pctrl);
1130 /* Disable and mask interrupts */
1131 amd_gpio_irq_init(gpio_dev);
1133 girq = &gpio_dev->gc.irq;
1134 gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
1135 /* This will let us handle the parent IRQ in the driver */
1136 girq->parent_handler = NULL;
1137 girq->num_parents = 0;
1138 girq->parents = NULL;
1139 girq->default_type = IRQ_TYPE_NONE;
1140 girq->handler = handle_simple_irq;
1142 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
1146 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
1147 0, 0, gpio_dev->gc.ngpio);
1149 dev_err(&pdev->dev, "Failed to add pin range\n");
1153 ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler,
1154 IRQF_SHARED, KBUILD_MODNAME, gpio_dev);
1158 platform_set_drvdata(pdev, gpio_dev);
1159 acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
1161 dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
1165 gpiochip_remove(&gpio_dev->gc);
1170 static int amd_gpio_remove(struct platform_device *pdev)
1172 struct amd_gpio *gpio_dev;
1174 gpio_dev = platform_get_drvdata(pdev);
1176 gpiochip_remove(&gpio_dev->gc);
1177 acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
1183 static const struct acpi_device_id amd_gpio_acpi_match[] = {
1189 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
1192 static struct platform_driver amd_gpio_driver = {
1195 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
1196 #ifdef CONFIG_PM_SLEEP
1197 .pm = &amd_gpio_pm_ops,
1200 .probe = amd_gpio_probe,
1201 .remove = amd_gpio_remove,
1204 module_platform_driver(amd_gpio_driver);
1206 MODULE_LICENSE("GPL v2");
1207 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
1208 MODULE_DESCRIPTION("AMD GPIO pinctrl driver");