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>
33 #include <linux/suspend.h>
36 #include "pinctrl-utils.h"
37 #include "pinctrl-amd.h"
39 static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
43 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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);
49 if (pin_reg & BIT(OUTPUT_ENABLE_OFF))
50 return GPIO_LINE_DIRECTION_OUT;
52 return GPIO_LINE_DIRECTION_IN;
55 static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
59 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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);
70 static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
75 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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);
81 pin_reg |= BIT(OUTPUT_VALUE_OFF);
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);
90 static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
94 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
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);
100 return !!(pin_reg & BIT(PIN_STS_OFF));
103 static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
107 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
109 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
110 pin_reg = readl(gpio_dev->base + offset * 4);
112 pin_reg |= BIT(OUTPUT_VALUE_OFF);
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);
119 static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
126 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
128 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
130 /* Use special handling for Pin0 debounce */
132 pin_reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
133 if (pin_reg & INTERNAL_GPIO0_DEBOUNCE)
137 pin_reg = readl(gpio_dev->base + offset * 4);
140 pin_reg |= DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF;
141 pin_reg &= ~DB_TMR_OUT_MASK;
143 Debounce Debounce Timer Max
144 TmrLarge TmrOutUnit Unit Debounce
146 0 0 61 usec (2 RtcClk) 976 usec
147 0 1 244 usec (8 RtcClk) 3.9 msec
148 1 0 15.6 msec (512 RtcClk) 250 msec
149 1 1 62.5 msec (2048 RtcClk) 1 sec
154 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
155 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
156 } else if (debounce < 976) {
157 time = debounce / 61;
158 pin_reg |= time & DB_TMR_OUT_MASK;
159 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
160 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
161 } else if (debounce < 3900) {
162 time = debounce / 244;
163 pin_reg |= time & DB_TMR_OUT_MASK;
164 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
165 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
166 } else if (debounce < 250000) {
167 time = debounce / 15625;
168 pin_reg |= time & DB_TMR_OUT_MASK;
169 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
170 pin_reg |= BIT(DB_TMR_LARGE_OFF);
171 } else if (debounce < 1000000) {
172 time = debounce / 62500;
173 pin_reg |= time & DB_TMR_OUT_MASK;
174 pin_reg |= BIT(DB_TMR_OUT_UNIT_OFF);
175 pin_reg |= BIT(DB_TMR_LARGE_OFF);
177 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
181 pin_reg &= ~BIT(DB_TMR_OUT_UNIT_OFF);
182 pin_reg &= ~BIT(DB_TMR_LARGE_OFF);
183 pin_reg &= ~DB_TMR_OUT_MASK;
184 pin_reg &= ~(DB_CNTRl_MASK << DB_CNTRL_OFF);
186 writel(pin_reg, gpio_dev->base + offset * 4);
187 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
192 #ifdef CONFIG_DEBUG_FS
193 static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
198 unsigned int bank, i, pin_num;
199 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
206 char *interrupt_mask;
215 char debounce_value[40];
216 char *debounce_enable;
219 seq_printf(s, "WAKE_INT_MASTER_REG: 0x%08x\n", readl(gpio_dev->base + WAKE_INT_MASTER_REG));
220 for (bank = 0; bank < gpio_dev->hwbank_num; bank++) {
221 unsigned int time = 0;
222 unsigned int unit = 0;
227 pin_num = AMD_GPIO_PINS_BANK0;
231 pin_num = AMD_GPIO_PINS_BANK1 + i;
235 pin_num = AMD_GPIO_PINS_BANK2 + i;
239 pin_num = AMD_GPIO_PINS_BANK3 + i;
242 /* Illegal bank number, ignore */
245 seq_printf(s, "GPIO bank%d\n", bank);
246 seq_puts(s, "gpio\t int|active|trigger|S0i3| S3|S4/S5| Z|wake|pull| orient| debounce|reg\n");
247 for (; i < pin_num; i++) {
248 seq_printf(s, "#%d\t", i);
249 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
250 pin_reg = readl(gpio_dev->base + i * 4);
251 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
253 if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
254 u8 level = (pin_reg >> ACTIVE_LEVEL_OFF) &
257 if (level == ACTIVE_LEVEL_HIGH)
259 else if (level == ACTIVE_LEVEL_LOW)
261 else if (!(pin_reg & BIT(LEVEL_TRIG_OFF)) &&
262 level == ACTIVE_LEVEL_BOTH)
267 if (pin_reg & BIT(LEVEL_TRIG_OFF))
268 level_trig = "level";
270 level_trig = " edge";
272 if (pin_reg & BIT(INTERRUPT_MASK_OFF))
273 interrupt_mask = "😛";
275 interrupt_mask = "😷";
277 if (pin_reg & BIT(INTERRUPT_STS_OFF))
282 seq_printf(s, "%s %s| %s| %s|",
288 seq_puts(s, " ∅| | |");
290 if (pin_reg & BIT(WAKE_CNTRL_OFF_S0I3))
294 seq_printf(s, " %s| ", wake_cntrl0);
296 if (pin_reg & BIT(WAKE_CNTRL_OFF_S3))
300 seq_printf(s, "%s|", wake_cntrl1);
302 if (pin_reg & BIT(WAKE_CNTRL_OFF_S4))
306 seq_printf(s, " %s|", wake_cntrl2);
308 if (pin_reg & BIT(WAKECNTRL_Z_OFF))
312 seq_printf(s, "%s|", wake_cntrlz);
314 if (pin_reg & BIT(WAKE_STS_OFF))
318 seq_printf(s, " %s|", wake_sts);
320 if (pin_reg & BIT(PULL_UP_ENABLE_OFF)) {
321 if (pin_reg & BIT(PULL_UP_SEL_OFF))
325 seq_printf(s, "%s ↑|",
327 } else if (pin_reg & BIT(PULL_DOWN_ENABLE_OFF)) {
333 if (pin_reg & BIT(OUTPUT_ENABLE_OFF)) {
335 if (pin_reg & BIT(OUTPUT_VALUE_OFF))
341 if (pin_reg & BIT(PIN_STS_OFF))
346 seq_printf(s, "%s %s|", pin_sts, orientation);
348 db_cntrl = (DB_CNTRl_MASK << DB_CNTRL_OFF) & pin_reg;
350 tmr_out_unit = pin_reg & BIT(DB_TMR_OUT_UNIT_OFF);
351 tmr_large = pin_reg & BIT(DB_TMR_LARGE_OFF);
352 time = pin_reg & DB_TMR_OUT_MASK;
364 if ((DB_TYPE_REMOVE_GLITCH << DB_CNTRL_OFF) == db_cntrl)
365 debounce_enable = "b";
366 else if ((DB_TYPE_PRESERVE_LOW_GLITCH << DB_CNTRL_OFF) == db_cntrl)
367 debounce_enable = "↓";
369 debounce_enable = "↑";
370 snprintf(debounce_value, sizeof(debounce_value), "%06u", time * unit);
371 seq_printf(s, "%s (🕑 %sus)|", debounce_enable, debounce_value);
375 seq_printf(s, "0x%x\n", pin_reg);
380 #define amd_gpio_dbg_show NULL
383 static void amd_gpio_irq_enable(struct irq_data *d)
387 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
388 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
390 gpiochip_enable_irq(gc, d->hwirq);
392 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
393 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
394 pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
395 pin_reg |= BIT(INTERRUPT_MASK_OFF);
396 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
397 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
400 static void amd_gpio_irq_disable(struct irq_data *d)
404 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
405 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
407 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
408 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
409 pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
410 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
411 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
412 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
414 gpiochip_disable_irq(gc, d->hwirq);
417 static void amd_gpio_irq_mask(struct irq_data *d)
421 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
422 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
424 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
425 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
426 pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
427 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
428 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
431 static void amd_gpio_irq_unmask(struct irq_data *d)
435 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
436 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
438 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
439 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
440 pin_reg |= BIT(INTERRUPT_MASK_OFF);
441 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
442 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
445 static int amd_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
449 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
450 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
451 u32 wake_mask = BIT(WAKE_CNTRL_OFF_S0I3) | BIT(WAKE_CNTRL_OFF_S3);
454 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
455 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
458 pin_reg |= wake_mask;
460 pin_reg &= ~wake_mask;
462 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
463 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
466 err = enable_irq_wake(gpio_dev->irq);
468 err = disable_irq_wake(gpio_dev->irq);
471 dev_err(&gpio_dev->pdev->dev, "failed to %s wake-up interrupt\n",
472 on ? "enable" : "disable");
477 static void amd_gpio_irq_eoi(struct irq_data *d)
481 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
482 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
484 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
485 reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
487 writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
488 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
491 static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
494 u32 pin_reg, pin_reg_irq_en, mask;
496 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
497 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
499 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
500 pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
502 switch (type & IRQ_TYPE_SENSE_MASK) {
503 case IRQ_TYPE_EDGE_RISING:
504 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
505 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
506 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
507 irq_set_handler_locked(d, handle_edge_irq);
510 case IRQ_TYPE_EDGE_FALLING:
511 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
512 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
513 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
514 irq_set_handler_locked(d, handle_edge_irq);
517 case IRQ_TYPE_EDGE_BOTH:
518 pin_reg &= ~BIT(LEVEL_TRIG_OFF);
519 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
520 pin_reg |= BOTH_EADGE << ACTIVE_LEVEL_OFF;
521 irq_set_handler_locked(d, handle_edge_irq);
524 case IRQ_TYPE_LEVEL_HIGH:
525 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
526 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
527 pin_reg |= ACTIVE_HIGH << ACTIVE_LEVEL_OFF;
528 irq_set_handler_locked(d, handle_level_irq);
531 case IRQ_TYPE_LEVEL_LOW:
532 pin_reg |= LEVEL_TRIGGER << LEVEL_TRIG_OFF;
533 pin_reg &= ~(ACTIVE_LEVEL_MASK << ACTIVE_LEVEL_OFF);
534 pin_reg |= ACTIVE_LOW << ACTIVE_LEVEL_OFF;
535 irq_set_handler_locked(d, handle_level_irq);
542 dev_err(&gpio_dev->pdev->dev, "Invalid type value\n");
546 pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
548 * If WAKE_INT_MASTER_REG.MaskStsEn is set, a software write to the
549 * debounce registers of any GPIO will block wake/interrupt status
550 * generation for *all* GPIOs for a length of time that depends on
551 * WAKE_INT_MASTER_REG.MaskStsLength[11:0]. During this period the
552 * INTERRUPT_ENABLE bit will read as 0.
554 * We temporarily enable irq for the GPIO whose configuration is
555 * changing, and then wait for it to read back as 1 to know when
556 * debounce has settled and then disable the irq again.
557 * We do this polling with the spinlock held to ensure other GPIO
558 * access routines do not read an incorrect value for the irq enable
559 * bit of other GPIOs. We keep the GPIO masked while polling to avoid
560 * spurious irqs, and disable the irq again after polling.
562 mask = BIT(INTERRUPT_ENABLE_OFF);
563 pin_reg_irq_en = pin_reg;
564 pin_reg_irq_en |= mask;
565 pin_reg_irq_en &= ~BIT(INTERRUPT_MASK_OFF);
566 writel(pin_reg_irq_en, gpio_dev->base + (d->hwirq)*4);
567 while ((readl(gpio_dev->base + (d->hwirq)*4) & mask) != mask)
569 writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
570 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
575 static void amd_irq_ack(struct irq_data *d)
578 * based on HW design,there is no need to ack HW
579 * before handle current irq. But this routine is
580 * necessary for handle_edge_irq
584 static const struct irq_chip amd_gpio_irqchip = {
586 .irq_ack = amd_irq_ack,
587 .irq_enable = amd_gpio_irq_enable,
588 .irq_disable = amd_gpio_irq_disable,
589 .irq_mask = amd_gpio_irq_mask,
590 .irq_unmask = amd_gpio_irq_unmask,
591 .irq_set_wake = amd_gpio_irq_set_wake,
592 .irq_eoi = amd_gpio_irq_eoi,
593 .irq_set_type = amd_gpio_irq_set_type,
595 * We need to set IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND so that a wake event
596 * also generates an IRQ. We need the IRQ so the irq_handler can clear
597 * the wake event. Otherwise the wake event will never clear and
598 * prevent the system from suspending.
600 .flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
601 GPIOCHIP_IRQ_RESOURCE_HELPERS,
604 #define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
606 static bool do_amd_gpio_irq_handler(int irq, void *dev_id)
608 struct amd_gpio *gpio_dev = dev_id;
609 struct gpio_chip *gc = &gpio_dev->gc;
610 unsigned int i, irqnr;
617 /* Read the wake status */
618 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
619 status = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
621 status |= readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
622 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
624 /* Bit 0-45 contain the relevant status bits */
625 status &= (1ULL << 46) - 1;
626 regs = gpio_dev->base;
627 for (mask = 1, irqnr = 0; status; mask <<= 1, regs += 4, irqnr += 4) {
628 if (!(status & mask))
632 /* Each status bit covers four pins */
633 for (i = 0; i < 4; i++) {
634 regval = readl(regs + i);
636 if (regval & PIN_IRQ_PENDING)
637 pm_pr_dbg("GPIO %d is active: 0x%x",
640 /* caused wake on resume context for shared IRQ */
641 if (irq < 0 && (regval & BIT(WAKE_STS_OFF)))
644 if (!(regval & PIN_IRQ_PENDING) ||
645 !(regval & BIT(INTERRUPT_MASK_OFF)))
647 generic_handle_domain_irq_safe(gc->irq.domain, irqnr + i);
650 * We must read the pin register again, in case the
651 * value was changed while executing
652 * generic_handle_domain_irq() above.
653 * If the line is not an irq, disable it in order to
654 * avoid a system hang caused by an interrupt storm.
656 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
657 regval = readl(regs + i);
658 if (!gpiochip_line_is_irq(gc, irqnr + i)) {
659 regval &= ~BIT(INTERRUPT_MASK_OFF);
660 dev_dbg(&gpio_dev->pdev->dev,
661 "Disabling spurious GPIO IRQ %d\n",
666 writel(regval, regs + i);
667 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
670 /* did not cause wake on resume context for shared IRQ */
674 /* Signal EOI to the GPIO unit */
675 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
676 regval = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
678 writel(regval, gpio_dev->base + WAKE_INT_MASTER_REG);
679 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
684 static irqreturn_t amd_gpio_irq_handler(int irq, void *dev_id)
686 return IRQ_RETVAL(do_amd_gpio_irq_handler(irq, dev_id));
689 static bool __maybe_unused amd_gpio_check_wake(void *dev_id)
691 return do_amd_gpio_irq_handler(-1, dev_id);
694 static int amd_get_groups_count(struct pinctrl_dev *pctldev)
696 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
698 return gpio_dev->ngroups;
701 static const char *amd_get_group_name(struct pinctrl_dev *pctldev,
704 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
706 return gpio_dev->groups[group].name;
709 static int amd_get_group_pins(struct pinctrl_dev *pctldev,
711 const unsigned **pins,
714 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
716 *pins = gpio_dev->groups[group].pins;
717 *num_pins = gpio_dev->groups[group].npins;
721 static const struct pinctrl_ops amd_pinctrl_ops = {
722 .get_groups_count = amd_get_groups_count,
723 .get_group_name = amd_get_group_name,
724 .get_group_pins = amd_get_group_pins,
726 .dt_node_to_map = pinconf_generic_dt_node_to_map_group,
727 .dt_free_map = pinctrl_utils_free_map,
731 static int amd_pinconf_get(struct pinctrl_dev *pctldev,
733 unsigned long *config)
738 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
739 enum pin_config_param param = pinconf_to_config_param(*config);
741 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
742 pin_reg = readl(gpio_dev->base + pin*4);
743 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
745 case PIN_CONFIG_INPUT_DEBOUNCE:
746 arg = pin_reg & DB_TMR_OUT_MASK;
749 case PIN_CONFIG_BIAS_PULL_DOWN:
750 arg = (pin_reg >> PULL_DOWN_ENABLE_OFF) & BIT(0);
753 case PIN_CONFIG_BIAS_PULL_UP:
754 arg = (pin_reg >> PULL_UP_SEL_OFF) & (BIT(0) | BIT(1));
757 case PIN_CONFIG_DRIVE_STRENGTH:
758 arg = (pin_reg >> DRV_STRENGTH_SEL_OFF) & DRV_STRENGTH_SEL_MASK;
762 dev_err(&gpio_dev->pdev->dev, "Invalid config param %04x\n",
767 *config = pinconf_to_config_packed(param, arg);
772 static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
773 unsigned long *configs, unsigned int num_configs)
780 enum pin_config_param param;
781 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
783 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
784 for (i = 0; i < num_configs; i++) {
785 param = pinconf_to_config_param(configs[i]);
786 arg = pinconf_to_config_argument(configs[i]);
787 pin_reg = readl(gpio_dev->base + pin*4);
790 case PIN_CONFIG_INPUT_DEBOUNCE:
791 pin_reg &= ~DB_TMR_OUT_MASK;
792 pin_reg |= arg & DB_TMR_OUT_MASK;
795 case PIN_CONFIG_BIAS_PULL_DOWN:
796 pin_reg &= ~BIT(PULL_DOWN_ENABLE_OFF);
797 pin_reg |= (arg & BIT(0)) << PULL_DOWN_ENABLE_OFF;
800 case PIN_CONFIG_BIAS_PULL_UP:
801 pin_reg &= ~BIT(PULL_UP_SEL_OFF);
802 pin_reg |= (arg & BIT(0)) << PULL_UP_SEL_OFF;
803 pin_reg &= ~BIT(PULL_UP_ENABLE_OFF);
804 pin_reg |= ((arg>>1) & BIT(0)) << PULL_UP_ENABLE_OFF;
807 case PIN_CONFIG_DRIVE_STRENGTH:
808 pin_reg &= ~(DRV_STRENGTH_SEL_MASK
809 << DRV_STRENGTH_SEL_OFF);
810 pin_reg |= (arg & DRV_STRENGTH_SEL_MASK)
811 << DRV_STRENGTH_SEL_OFF;
815 dev_err(&gpio_dev->pdev->dev,
816 "Invalid config param %04x\n", param);
820 writel(pin_reg, gpio_dev->base + pin*4);
822 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
827 static int amd_pinconf_group_get(struct pinctrl_dev *pctldev,
829 unsigned long *config)
831 const unsigned *pins;
835 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
839 if (amd_pinconf_get(pctldev, pins[0], config))
845 static int amd_pinconf_group_set(struct pinctrl_dev *pctldev,
846 unsigned group, unsigned long *configs,
847 unsigned num_configs)
849 const unsigned *pins;
853 ret = amd_get_group_pins(pctldev, group, &pins, &npins);
856 for (i = 0; i < npins; i++) {
857 if (amd_pinconf_set(pctldev, pins[i], configs, num_configs))
863 static int amd_gpio_set_config(struct gpio_chip *gc, unsigned int pin,
864 unsigned long config)
866 struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
868 if (pinconf_to_config_param(config) == PIN_CONFIG_INPUT_DEBOUNCE) {
869 u32 debounce = pinconf_to_config_argument(config);
871 return amd_gpio_set_debounce(gc, pin, debounce);
874 return amd_pinconf_set(gpio_dev->pctrl, pin, &config, 1);
877 static const struct pinconf_ops amd_pinconf_ops = {
878 .pin_config_get = amd_pinconf_get,
879 .pin_config_set = amd_pinconf_set,
880 .pin_config_group_get = amd_pinconf_group_get,
881 .pin_config_group_set = amd_pinconf_group_set,
884 #ifdef CONFIG_PM_SLEEP
885 static bool amd_gpio_should_save(struct amd_gpio *gpio_dev, unsigned int pin)
887 const struct pin_desc *pd = pin_desc_get(gpio_dev->pctrl, pin);
893 * Only restore the pin if it is actually in use by the kernel (or
896 if (pd->mux_owner || pd->gpio_owner ||
897 gpiochip_line_is_irq(&gpio_dev->gc, pin))
903 static int amd_gpio_suspend(struct device *dev)
905 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
906 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
910 for (i = 0; i < desc->npins; i++) {
911 int pin = desc->pins[i].number;
913 if (!amd_gpio_should_save(gpio_dev, pin))
916 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
917 gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
918 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
924 static int amd_gpio_resume(struct device *dev)
926 struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
927 struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
931 for (i = 0; i < desc->npins; i++) {
932 int pin = desc->pins[i].number;
934 if (!amd_gpio_should_save(gpio_dev, pin))
937 raw_spin_lock_irqsave(&gpio_dev->lock, flags);
938 gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING;
939 writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4);
940 raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
946 static const struct dev_pm_ops amd_gpio_pm_ops = {
947 SET_LATE_SYSTEM_SLEEP_PM_OPS(amd_gpio_suspend,
952 static int amd_get_functions_count(struct pinctrl_dev *pctldev)
954 return ARRAY_SIZE(pmx_functions);
957 static const char *amd_get_fname(struct pinctrl_dev *pctrldev, unsigned int selector)
959 return pmx_functions[selector].name;
962 static int amd_get_groups(struct pinctrl_dev *pctrldev, unsigned int selector,
963 const char * const **groups,
964 unsigned int * const num_groups)
966 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
968 if (!gpio_dev->iomux_base) {
969 dev_err(&gpio_dev->pdev->dev, "iomux function %d group not supported\n", selector);
973 *groups = pmx_functions[selector].groups;
974 *num_groups = pmx_functions[selector].ngroups;
978 static int amd_set_mux(struct pinctrl_dev *pctrldev, unsigned int function, unsigned int group)
980 struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctrldev);
981 struct device *dev = &gpio_dev->pdev->dev;
985 if (!gpio_dev->iomux_base)
988 for (index = 0; index < NSELECTS; index++) {
989 if (strcmp(gpio_dev->groups[group].name, pmx_functions[function].groups[index]))
992 if (readb(gpio_dev->iomux_base + pmx_functions[function].index) ==
994 dev_err(dev, "IOMUX_GPIO 0x%x not present or supported\n",
995 pmx_functions[function].index);
999 writeb(index, gpio_dev->iomux_base + pmx_functions[function].index);
1001 if (index != (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 for (ind = 0; ind < gpio_dev->groups[group].npins; ind++) {
1009 if (strncmp(gpio_dev->groups[group].name, "IMX_F", strlen("IMX_F")))
1012 pd = pin_desc_get(gpio_dev->pctrl, gpio_dev->groups[group].pins[ind]);
1013 pd->mux_owner = gpio_dev->groups[group].name;
1021 static const struct pinmux_ops amd_pmxops = {
1022 .get_functions_count = amd_get_functions_count,
1023 .get_function_name = amd_get_fname,
1024 .get_function_groups = amd_get_groups,
1025 .set_mux = amd_set_mux,
1028 static struct pinctrl_desc amd_pinctrl_desc = {
1029 .pins = kerncz_pins,
1030 .npins = ARRAY_SIZE(kerncz_pins),
1031 .pctlops = &amd_pinctrl_ops,
1032 .pmxops = &amd_pmxops,
1033 .confops = &amd_pinconf_ops,
1034 .owner = THIS_MODULE,
1037 static void amd_get_iomux_res(struct amd_gpio *gpio_dev)
1039 struct pinctrl_desc *desc = &amd_pinctrl_desc;
1040 struct device *dev = &gpio_dev->pdev->dev;
1043 index = device_property_match_string(dev, "pinctrl-resource-names", "iomux");
1045 dev_dbg(dev, "iomux not supported\n");
1049 gpio_dev->iomux_base = devm_platform_ioremap_resource(gpio_dev->pdev, index);
1050 if (IS_ERR(gpio_dev->iomux_base)) {
1051 dev_dbg(dev, "iomux not supported %d io resource\n", index);
1058 desc->pmxops = NULL;
1061 static int amd_gpio_probe(struct platform_device *pdev)
1064 struct resource *res;
1065 struct amd_gpio *gpio_dev;
1066 struct gpio_irq_chip *girq;
1068 gpio_dev = devm_kzalloc(&pdev->dev,
1069 sizeof(struct amd_gpio), GFP_KERNEL);
1073 raw_spin_lock_init(&gpio_dev->lock);
1075 gpio_dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
1076 if (IS_ERR(gpio_dev->base)) {
1077 dev_err(&pdev->dev, "Failed to get gpio io resource.\n");
1078 return PTR_ERR(gpio_dev->base);
1081 gpio_dev->irq = platform_get_irq(pdev, 0);
1082 if (gpio_dev->irq < 0)
1083 return gpio_dev->irq;
1085 #ifdef CONFIG_PM_SLEEP
1086 gpio_dev->saved_regs = devm_kcalloc(&pdev->dev, amd_pinctrl_desc.npins,
1087 sizeof(*gpio_dev->saved_regs),
1089 if (!gpio_dev->saved_regs)
1093 gpio_dev->pdev = pdev;
1094 gpio_dev->gc.get_direction = amd_gpio_get_direction;
1095 gpio_dev->gc.direction_input = amd_gpio_direction_input;
1096 gpio_dev->gc.direction_output = amd_gpio_direction_output;
1097 gpio_dev->gc.get = amd_gpio_get_value;
1098 gpio_dev->gc.set = amd_gpio_set_value;
1099 gpio_dev->gc.set_config = amd_gpio_set_config;
1100 gpio_dev->gc.dbg_show = amd_gpio_dbg_show;
1102 gpio_dev->gc.base = -1;
1103 gpio_dev->gc.label = pdev->name;
1104 gpio_dev->gc.owner = THIS_MODULE;
1105 gpio_dev->gc.parent = &pdev->dev;
1106 gpio_dev->gc.ngpio = resource_size(res) / 4;
1108 gpio_dev->hwbank_num = gpio_dev->gc.ngpio / 64;
1109 gpio_dev->groups = kerncz_groups;
1110 gpio_dev->ngroups = ARRAY_SIZE(kerncz_groups);
1112 amd_pinctrl_desc.name = dev_name(&pdev->dev);
1113 amd_get_iomux_res(gpio_dev);
1114 gpio_dev->pctrl = devm_pinctrl_register(&pdev->dev, &amd_pinctrl_desc,
1116 if (IS_ERR(gpio_dev->pctrl)) {
1117 dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
1118 return PTR_ERR(gpio_dev->pctrl);
1121 girq = &gpio_dev->gc.irq;
1122 gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
1123 /* This will let us handle the parent IRQ in the driver */
1124 girq->parent_handler = NULL;
1125 girq->num_parents = 0;
1126 girq->parents = NULL;
1127 girq->default_type = IRQ_TYPE_NONE;
1128 girq->handler = handle_simple_irq;
1130 ret = gpiochip_add_data(&gpio_dev->gc, gpio_dev);
1134 ret = gpiochip_add_pin_range(&gpio_dev->gc, dev_name(&pdev->dev),
1135 0, 0, gpio_dev->gc.ngpio);
1137 dev_err(&pdev->dev, "Failed to add pin range\n");
1141 ret = devm_request_irq(&pdev->dev, gpio_dev->irq, amd_gpio_irq_handler,
1142 IRQF_SHARED, KBUILD_MODNAME, gpio_dev);
1146 platform_set_drvdata(pdev, gpio_dev);
1147 acpi_register_wakeup_handler(gpio_dev->irq, amd_gpio_check_wake, gpio_dev);
1149 dev_dbg(&pdev->dev, "amd gpio driver loaded\n");
1153 gpiochip_remove(&gpio_dev->gc);
1158 static int amd_gpio_remove(struct platform_device *pdev)
1160 struct amd_gpio *gpio_dev;
1162 gpio_dev = platform_get_drvdata(pdev);
1164 gpiochip_remove(&gpio_dev->gc);
1165 acpi_unregister_wakeup_handler(amd_gpio_check_wake, gpio_dev);
1171 static const struct acpi_device_id amd_gpio_acpi_match[] = {
1177 MODULE_DEVICE_TABLE(acpi, amd_gpio_acpi_match);
1180 static struct platform_driver amd_gpio_driver = {
1183 .acpi_match_table = ACPI_PTR(amd_gpio_acpi_match),
1184 #ifdef CONFIG_PM_SLEEP
1185 .pm = &amd_gpio_pm_ops,
1188 .probe = amd_gpio_probe,
1189 .remove = amd_gpio_remove,
1192 module_platform_driver(amd_gpio_driver);
1194 MODULE_AUTHOR("Ken Xue <Ken.Xue@amd.com>, Jeff Wu <Jeff.Wu@amd.com>");
1195 MODULE_DESCRIPTION("AMD GPIO pinctrl driver");