2 * GPIO driver for Marvell SoCs
4 * Copyright (C) 2012 Marvell
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
14 * This driver is a fairly straightforward GPIO driver for the
15 * complete family of Marvell EBU SoC platforms (Orion, Dove,
16 * Kirkwood, Discovery, Armada 370/XP). The only complexity of this
17 * driver is the different register layout that exists between the
18 * non-SMP platforms (Orion, Dove, Kirkwood, Armada 370) and the SMP
19 * platforms (MV78200 from the Discovery family and the Armada
20 * XP). Therefore, this driver handles three variants of the GPIO
22 * - the basic variant, called "orion-gpio", with the simplest
23 * register set. Used on Orion, Dove, Kirkwoord, Armada 370 and
24 * non-SMP Discovery systems
25 * - the mv78200 variant for MV78200 Discovery systems. This variant
26 * turns the edge mask and level mask registers into CPU0 edge
27 * mask/level mask registers, and adds CPU1 edge mask/level mask
29 * - the armadaxp variant for Armada XP systems. This variant keeps
30 * the normal cause/edge mask/level mask registers when the global
31 * interrupts are used, but adds per-CPU cause/edge mask/level mask
32 * registers n a separate memory area for the per-CPU GPIO
36 #include <linux/bitops.h>
37 #include <linux/clk.h>
38 #include <linux/err.h>
39 #include <linux/gpio/driver.h>
40 #include <linux/gpio/consumer.h>
41 #include <linux/init.h>
43 #include <linux/irq.h>
44 #include <linux/irqchip/chained_irq.h>
45 #include <linux/irqdomain.h>
46 #include <linux/mfd/syscon.h>
47 #include <linux/of_device.h>
48 #include <linux/of_irq.h>
49 #include <linux/pinctrl/consumer.h>
50 #include <linux/platform_device.h>
51 #include <linux/pwm.h>
52 #include <linux/regmap.h>
53 #include <linux/slab.h>
56 * GPIO unit register offsets.
58 #define GPIO_OUT_OFF 0x0000
59 #define GPIO_IO_CONF_OFF 0x0004
60 #define GPIO_BLINK_EN_OFF 0x0008
61 #define GPIO_IN_POL_OFF 0x000c
62 #define GPIO_DATA_IN_OFF 0x0010
63 #define GPIO_EDGE_CAUSE_OFF 0x0014
64 #define GPIO_EDGE_MASK_OFF 0x0018
65 #define GPIO_LEVEL_MASK_OFF 0x001c
66 #define GPIO_BLINK_CNT_SELECT_OFF 0x0020
69 * PWM register offsets.
71 #define PWM_BLINK_ON_DURATION_OFF 0x0
72 #define PWM_BLINK_OFF_DURATION_OFF 0x4
75 /* The MV78200 has per-CPU registers for edge mask and level mask */
76 #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
77 #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
80 * The Armada XP has per-CPU registers for interrupt cause, interrupt
81 * mask and interrupt level mask. Those are relative to the
84 #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
85 #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
86 #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
88 #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
89 #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
90 #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
91 #define MVEBU_GPIO_SOC_VARIANT_A8K 0x4
93 #define MVEBU_MAX_GPIO_PER_BANK 32
96 void __iomem *membase;
97 unsigned long clk_rate;
98 struct gpio_desc *gpiod;
101 struct mvebu_gpio_chip *mvchip;
103 /* Used to preserve GPIO/PWM registers across suspend/resume */
105 u32 blink_on_duration;
106 u32 blink_off_duration;
109 struct mvebu_gpio_chip {
110 struct gpio_chip chip;
113 struct regmap *percpu_regs;
115 struct irq_domain *domain;
118 /* Used for PWM support */
120 struct mvebu_pwm *mvpwm;
122 /* Used to preserve GPIO registers across suspend/resume */
127 u32 edge_mask_regs[4];
128 u32 level_mask_regs[4];
132 * Functions returning addresses of individual registers for a given
136 static void mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip,
137 struct regmap **map, unsigned int *offset)
141 switch (mvchip->soc_variant) {
142 case MVEBU_GPIO_SOC_VARIANT_ORION:
143 case MVEBU_GPIO_SOC_VARIANT_MV78200:
144 case MVEBU_GPIO_SOC_VARIANT_A8K:
146 *offset = GPIO_EDGE_CAUSE_OFF + mvchip->offset;
148 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
149 cpu = smp_processor_id();
150 *map = mvchip->percpu_regs;
151 *offset = GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
159 mvebu_gpio_read_edge_cause(struct mvebu_gpio_chip *mvchip)
165 mvebu_gpioreg_edge_cause(mvchip, &map, &offset);
166 regmap_read(map, offset, &val);
172 mvebu_gpio_write_edge_cause(struct mvebu_gpio_chip *mvchip, u32 val)
177 mvebu_gpioreg_edge_cause(mvchip, &map, &offset);
178 regmap_write(map, offset, val);
182 mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip,
183 struct regmap **map, unsigned int *offset)
187 switch (mvchip->soc_variant) {
188 case MVEBU_GPIO_SOC_VARIANT_ORION:
189 case MVEBU_GPIO_SOC_VARIANT_A8K:
191 *offset = GPIO_EDGE_MASK_OFF + mvchip->offset;
193 case MVEBU_GPIO_SOC_VARIANT_MV78200:
194 cpu = smp_processor_id();
196 *offset = GPIO_EDGE_MASK_MV78200_OFF(cpu);
198 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
199 cpu = smp_processor_id();
200 *map = mvchip->percpu_regs;
201 *offset = GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
209 mvebu_gpio_read_edge_mask(struct mvebu_gpio_chip *mvchip)
215 mvebu_gpioreg_edge_mask(mvchip, &map, &offset);
216 regmap_read(map, offset, &val);
222 mvebu_gpio_write_edge_mask(struct mvebu_gpio_chip *mvchip, u32 val)
227 mvebu_gpioreg_edge_mask(mvchip, &map, &offset);
228 regmap_write(map, offset, val);
232 mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip,
233 struct regmap **map, unsigned int *offset)
237 switch (mvchip->soc_variant) {
238 case MVEBU_GPIO_SOC_VARIANT_ORION:
239 case MVEBU_GPIO_SOC_VARIANT_A8K:
241 *offset = GPIO_LEVEL_MASK_OFF + mvchip->offset;
243 case MVEBU_GPIO_SOC_VARIANT_MV78200:
244 cpu = smp_processor_id();
246 *offset = GPIO_LEVEL_MASK_MV78200_OFF(cpu);
248 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
249 cpu = smp_processor_id();
250 *map = mvchip->percpu_regs;
251 *offset = GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
259 mvebu_gpio_read_level_mask(struct mvebu_gpio_chip *mvchip)
265 mvebu_gpioreg_level_mask(mvchip, &map, &offset);
266 regmap_read(map, offset, &val);
272 mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val)
277 mvebu_gpioreg_level_mask(mvchip, &map, &offset);
278 regmap_write(map, offset, val);
282 * Functions returning addresses of individual registers for a given
285 static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm)
287 return mvpwm->membase + PWM_BLINK_ON_DURATION_OFF;
290 static void __iomem *mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm)
292 return mvpwm->membase + PWM_BLINK_OFF_DURATION_OFF;
296 * Functions implementing the gpio_chip methods
298 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value)
300 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
302 regmap_update_bits(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
303 BIT(pin), value ? BIT(pin) : 0);
306 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin)
308 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
311 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
316 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset,
318 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
320 u = data_in ^ in_pol;
322 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &u);
325 return (u >> pin) & 1;
328 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin,
331 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
333 regmap_update_bits(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
334 BIT(pin), value ? BIT(pin) : 0);
337 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
339 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
343 * Check with the pinctrl driver whether this pin is usable as
346 ret = pinctrl_gpio_direction_input(chip->base + pin);
350 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
356 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
359 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
363 * Check with the pinctrl driver whether this pin is usable as
366 ret = pinctrl_gpio_direction_output(chip->base + pin);
370 mvebu_gpio_blink(chip, pin, 0);
371 mvebu_gpio_set(chip, pin, value);
373 regmap_update_bits(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
379 static int mvebu_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
381 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
384 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
386 return !!(u & BIT(pin));
389 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin)
391 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
393 return irq_create_mapping(mvchip->domain, pin);
397 * Functions implementing the irq_chip methods
399 static void mvebu_gpio_irq_ack(struct irq_data *d)
401 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
402 struct mvebu_gpio_chip *mvchip = gc->private;
406 mvebu_gpio_write_edge_cause(mvchip, ~mask);
410 static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
412 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
413 struct mvebu_gpio_chip *mvchip = gc->private;
414 struct irq_chip_type *ct = irq_data_get_chip_type(d);
418 ct->mask_cache_priv &= ~mask;
419 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv);
423 static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
425 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
426 struct mvebu_gpio_chip *mvchip = gc->private;
427 struct irq_chip_type *ct = irq_data_get_chip_type(d);
431 ct->mask_cache_priv |= mask;
432 mvebu_gpio_write_edge_mask(mvchip, ct->mask_cache_priv);
436 static void mvebu_gpio_level_irq_mask(struct irq_data *d)
438 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
439 struct mvebu_gpio_chip *mvchip = gc->private;
440 struct irq_chip_type *ct = irq_data_get_chip_type(d);
444 ct->mask_cache_priv &= ~mask;
445 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv);
449 static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
451 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
452 struct mvebu_gpio_chip *mvchip = gc->private;
453 struct irq_chip_type *ct = irq_data_get_chip_type(d);
457 ct->mask_cache_priv |= mask;
458 mvebu_gpio_write_level_mask(mvchip, ct->mask_cache_priv);
462 /*****************************************************************************
465 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
466 * value of the line or the opposite value.
468 * Level IRQ handlers: DATA_IN is used directly as cause register.
469 * Interrupt are masked by LEVEL_MASK registers.
470 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
471 * Interrupt are masked by EDGE_MASK registers.
472 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
473 * the polarity to catch the next line transaction.
474 * This is a race condition that might not perfectly
475 * work on some use cases.
477 * Every eight GPIO lines are grouped (OR'ed) before going up to main
481 * data-in /--------| |-----| |----\
482 * -----| |----- ---- to main cause reg
483 * X \----------------| |----/
484 * polarity LEVEL mask
486 ****************************************************************************/
488 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
490 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
491 struct irq_chip_type *ct = irq_data_get_chip_type(d);
492 struct mvebu_gpio_chip *mvchip = gc->private;
498 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);
499 if ((u & BIT(pin)) == 0)
502 type &= IRQ_TYPE_SENSE_MASK;
503 if (type == IRQ_TYPE_NONE)
506 /* Check if we need to change chip and handler */
507 if (!(ct->type & type))
508 if (irq_setup_alt_chip(d, type))
512 * Configure interrupt polarity.
515 case IRQ_TYPE_EDGE_RISING:
516 case IRQ_TYPE_LEVEL_HIGH:
517 regmap_update_bits(mvchip->regs,
518 GPIO_IN_POL_OFF + mvchip->offset,
521 case IRQ_TYPE_EDGE_FALLING:
522 case IRQ_TYPE_LEVEL_LOW:
523 regmap_update_bits(mvchip->regs,
524 GPIO_IN_POL_OFF + mvchip->offset,
527 case IRQ_TYPE_EDGE_BOTH: {
528 u32 data_in, in_pol, val;
530 regmap_read(mvchip->regs,
531 GPIO_IN_POL_OFF + mvchip->offset, &in_pol);
532 regmap_read(mvchip->regs,
533 GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
536 * set initial polarity based on current input level
538 if ((data_in ^ in_pol) & BIT(pin))
539 val = BIT(pin); /* falling */
541 val = 0; /* raising */
543 regmap_update_bits(mvchip->regs,
544 GPIO_IN_POL_OFF + mvchip->offset,
552 static void mvebu_gpio_irq_handler(struct irq_desc *desc)
554 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc);
555 struct irq_chip *chip = irq_desc_get_chip(desc);
556 u32 cause, type, data_in, level_mask, edge_cause, edge_mask;
562 chained_irq_enter(chip, desc);
564 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
565 level_mask = mvebu_gpio_read_level_mask(mvchip);
566 edge_cause = mvebu_gpio_read_edge_cause(mvchip);
567 edge_mask = mvebu_gpio_read_edge_mask(mvchip);
569 cause = (data_in & level_mask) | (edge_cause & edge_mask);
571 for (i = 0; i < mvchip->chip.ngpio; i++) {
574 irq = irq_find_mapping(mvchip->domain, i);
576 if (!(cause & BIT(i)))
579 type = irq_get_trigger_type(irq);
580 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
581 /* Swap polarity (race with GPIO line) */
584 regmap_read(mvchip->regs,
585 GPIO_IN_POL_OFF + mvchip->offset,
588 regmap_write(mvchip->regs,
589 GPIO_IN_POL_OFF + mvchip->offset,
593 generic_handle_irq(irq);
596 chained_irq_exit(chip, desc);
600 * Functions implementing the pwm_chip methods
602 static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip)
604 return container_of(chip, struct mvebu_pwm, chip);
607 static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
609 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
610 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
611 struct gpio_desc *desc;
615 spin_lock_irqsave(&mvpwm->lock, flags);
620 desc = gpiochip_request_own_desc(&mvchip->chip,
621 pwm->hwpwm, "mvebu-pwm", 0);
627 ret = gpiod_direction_output(desc, 0);
629 gpiochip_free_own_desc(desc);
636 spin_unlock_irqrestore(&mvpwm->lock, flags);
640 static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
642 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
645 spin_lock_irqsave(&mvpwm->lock, flags);
646 gpiochip_free_own_desc(mvpwm->gpiod);
648 spin_unlock_irqrestore(&mvpwm->lock, flags);
651 static void mvebu_pwm_get_state(struct pwm_chip *chip,
652 struct pwm_device *pwm,
653 struct pwm_state *state) {
655 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
656 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
657 unsigned long long val;
661 spin_lock_irqsave(&mvpwm->lock, flags);
663 val = (unsigned long long)
664 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
666 do_div(val, mvpwm->clk_rate);
668 state->duty_cycle = UINT_MAX;
670 state->duty_cycle = val;
672 state->duty_cycle = 1;
674 val = (unsigned long long)
675 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
677 do_div(val, mvpwm->clk_rate);
678 if (val < state->duty_cycle) {
681 val -= state->duty_cycle;
683 state->period = UINT_MAX;
690 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &u);
692 state->enabled = true;
694 state->enabled = false;
696 spin_unlock_irqrestore(&mvpwm->lock, flags);
699 static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
700 struct pwm_state *state)
702 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
703 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
704 unsigned long long val;
706 unsigned int on, off;
708 val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
709 do_div(val, NSEC_PER_SEC);
717 val = (unsigned long long) mvpwm->clk_rate *
718 (state->period - state->duty_cycle);
719 do_div(val, NSEC_PER_SEC);
727 spin_lock_irqsave(&mvpwm->lock, flags);
729 writel_relaxed(on, mvebu_pwmreg_blink_on_duration(mvpwm));
730 writel_relaxed(off, mvebu_pwmreg_blink_off_duration(mvpwm));
732 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1);
734 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0);
736 spin_unlock_irqrestore(&mvpwm->lock, flags);
741 static const struct pwm_ops mvebu_pwm_ops = {
742 .request = mvebu_pwm_request,
743 .free = mvebu_pwm_free,
744 .get_state = mvebu_pwm_get_state,
745 .apply = mvebu_pwm_apply,
746 .owner = THIS_MODULE,
749 static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
751 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
753 regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
754 &mvpwm->blink_select);
755 mvpwm->blink_on_duration =
756 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
757 mvpwm->blink_off_duration =
758 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
761 static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
763 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
765 regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset,
766 mvpwm->blink_select);
767 writel_relaxed(mvpwm->blink_on_duration,
768 mvebu_pwmreg_blink_on_duration(mvpwm));
769 writel_relaxed(mvpwm->blink_off_duration,
770 mvebu_pwmreg_blink_off_duration(mvpwm));
773 static int mvebu_pwm_probe(struct platform_device *pdev,
774 struct mvebu_gpio_chip *mvchip,
777 struct device *dev = &pdev->dev;
778 struct mvebu_pwm *mvpwm;
779 struct resource *res;
782 if (!of_device_is_compatible(mvchip->chip.of_node,
783 "marvell,armada-370-gpio"))
787 * There are only two sets of PWM configuration registers for
788 * all the GPIO lines on those SoCs which this driver reserves
789 * for the first two GPIO chips. So if the resource is missing
790 * we can't treat it as an error.
792 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
796 if (IS_ERR(mvchip->clk))
797 return PTR_ERR(mvchip->clk);
800 * Use set A for lines of GPIO chip with id 0, B for GPIO chip
801 * with id 1. Don't allow further GPIO chips to be used for PWM.
809 regmap_write(mvchip->regs,
810 GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set);
812 mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL);
815 mvchip->mvpwm = mvpwm;
816 mvpwm->mvchip = mvchip;
818 mvpwm->membase = devm_ioremap_resource(dev, res);
819 if (IS_ERR(mvpwm->membase))
820 return PTR_ERR(mvpwm->membase);
822 mvpwm->clk_rate = clk_get_rate(mvchip->clk);
823 if (!mvpwm->clk_rate) {
824 dev_err(dev, "failed to get clock rate\n");
828 mvpwm->chip.dev = dev;
829 mvpwm->chip.ops = &mvebu_pwm_ops;
830 mvpwm->chip.npwm = mvchip->chip.ngpio;
832 * There may already be some PWM allocated, so we can't force
833 * mvpwm->chip.base to a fixed point like mvchip->chip.base.
834 * So, we let pwmchip_add() do the numbering and take the next free
837 mvpwm->chip.base = -1;
839 spin_lock_init(&mvpwm->lock);
841 return pwmchip_add(&mvpwm->chip);
844 #ifdef CONFIG_DEBUG_FS
845 #include <linux/seq_file.h>
847 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
849 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
850 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
853 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset, &out);
854 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &io_conf);
855 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &blink);
856 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset, &in_pol);
857 regmap_read(mvchip->regs, GPIO_DATA_IN_OFF + mvchip->offset, &data_in);
858 cause = mvebu_gpio_read_edge_cause(mvchip);
859 edg_msk = mvebu_gpio_read_edge_mask(mvchip);
860 lvl_msk = mvebu_gpio_read_level_mask(mvchip);
862 for (i = 0; i < chip->ngpio; i++) {
867 label = gpiochip_is_requested(chip, i);
872 is_out = !(io_conf & msk);
874 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
877 seq_printf(s, " out %s %s\n",
878 out & msk ? "hi" : "lo",
879 blink & msk ? "(blink )" : "");
883 seq_printf(s, " in %s (act %s) - IRQ",
884 (data_in ^ in_pol) & msk ? "hi" : "lo",
885 in_pol & msk ? "lo" : "hi");
886 if (!((edg_msk | lvl_msk) & msk)) {
887 seq_puts(s, " disabled\n");
891 seq_puts(s, " edge ");
893 seq_puts(s, " level");
894 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
898 #define mvebu_gpio_dbg_show NULL
901 static const struct of_device_id mvebu_gpio_of_match[] = {
903 .compatible = "marvell,orion-gpio",
904 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
907 .compatible = "marvell,mv78200-gpio",
908 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
911 .compatible = "marvell,armadaxp-gpio",
912 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
915 .compatible = "marvell,armada-370-gpio",
916 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
919 .compatible = "marvell,armada-8k-gpio",
920 .data = (void *) MVEBU_GPIO_SOC_VARIANT_A8K,
927 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
929 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
932 regmap_read(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
934 regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
935 &mvchip->io_conf_reg);
936 regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
937 &mvchip->blink_en_reg);
938 regmap_read(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
939 &mvchip->in_pol_reg);
941 switch (mvchip->soc_variant) {
942 case MVEBU_GPIO_SOC_VARIANT_ORION:
943 case MVEBU_GPIO_SOC_VARIANT_A8K:
944 regmap_read(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset,
945 &mvchip->edge_mask_regs[0]);
946 regmap_read(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset,
947 &mvchip->level_mask_regs[0]);
949 case MVEBU_GPIO_SOC_VARIANT_MV78200:
950 for (i = 0; i < 2; i++) {
951 regmap_read(mvchip->regs,
952 GPIO_EDGE_MASK_MV78200_OFF(i),
953 &mvchip->edge_mask_regs[i]);
954 regmap_read(mvchip->regs,
955 GPIO_LEVEL_MASK_MV78200_OFF(i),
956 &mvchip->level_mask_regs[i]);
959 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
960 for (i = 0; i < 4; i++) {
961 regmap_read(mvchip->regs,
962 GPIO_EDGE_MASK_ARMADAXP_OFF(i),
963 &mvchip->edge_mask_regs[i]);
964 regmap_read(mvchip->regs,
965 GPIO_LEVEL_MASK_ARMADAXP_OFF(i),
966 &mvchip->level_mask_regs[i]);
973 if (IS_ENABLED(CONFIG_PWM))
974 mvebu_pwm_suspend(mvchip);
979 static int mvebu_gpio_resume(struct platform_device *pdev)
981 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
984 regmap_write(mvchip->regs, GPIO_OUT_OFF + mvchip->offset,
986 regmap_write(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset,
987 mvchip->io_conf_reg);
988 regmap_write(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset,
989 mvchip->blink_en_reg);
990 regmap_write(mvchip->regs, GPIO_IN_POL_OFF + mvchip->offset,
993 switch (mvchip->soc_variant) {
994 case MVEBU_GPIO_SOC_VARIANT_ORION:
995 case MVEBU_GPIO_SOC_VARIANT_A8K:
996 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF + mvchip->offset,
997 mvchip->edge_mask_regs[0]);
998 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF + mvchip->offset,
999 mvchip->level_mask_regs[0]);
1001 case MVEBU_GPIO_SOC_VARIANT_MV78200:
1002 for (i = 0; i < 2; i++) {
1003 regmap_write(mvchip->regs,
1004 GPIO_EDGE_MASK_MV78200_OFF(i),
1005 mvchip->edge_mask_regs[i]);
1006 regmap_write(mvchip->regs,
1007 GPIO_LEVEL_MASK_MV78200_OFF(i),
1008 mvchip->level_mask_regs[i]);
1011 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1012 for (i = 0; i < 4; i++) {
1013 regmap_write(mvchip->regs,
1014 GPIO_EDGE_MASK_ARMADAXP_OFF(i),
1015 mvchip->edge_mask_regs[i]);
1016 regmap_write(mvchip->regs,
1017 GPIO_LEVEL_MASK_ARMADAXP_OFF(i),
1018 mvchip->level_mask_regs[i]);
1025 if (IS_ENABLED(CONFIG_PWM))
1026 mvebu_pwm_resume(mvchip);
1031 static const struct regmap_config mvebu_gpio_regmap_config = {
1038 static int mvebu_gpio_probe_raw(struct platform_device *pdev,
1039 struct mvebu_gpio_chip *mvchip)
1043 base = devm_platform_ioremap_resource(pdev, 0);
1045 return PTR_ERR(base);
1047 mvchip->regs = devm_regmap_init_mmio(&pdev->dev, base,
1048 &mvebu_gpio_regmap_config);
1049 if (IS_ERR(mvchip->regs))
1050 return PTR_ERR(mvchip->regs);
1053 * For the legacy SoCs, the regmap directly maps to the GPIO
1054 * registers, so no offset is needed.
1059 * The Armada XP has a second range of registers for the
1062 if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
1063 base = devm_platform_ioremap_resource(pdev, 1);
1065 return PTR_ERR(base);
1067 mvchip->percpu_regs =
1068 devm_regmap_init_mmio(&pdev->dev, base,
1069 &mvebu_gpio_regmap_config);
1070 if (IS_ERR(mvchip->percpu_regs))
1071 return PTR_ERR(mvchip->percpu_regs);
1077 static int mvebu_gpio_probe_syscon(struct platform_device *pdev,
1078 struct mvebu_gpio_chip *mvchip)
1080 mvchip->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
1081 if (IS_ERR(mvchip->regs))
1082 return PTR_ERR(mvchip->regs);
1084 if (of_property_read_u32(pdev->dev.of_node, "offset", &mvchip->offset))
1090 static int mvebu_gpio_probe(struct platform_device *pdev)
1092 struct mvebu_gpio_chip *mvchip;
1093 const struct of_device_id *match;
1094 struct device_node *np = pdev->dev.of_node;
1095 struct irq_chip_generic *gc;
1096 struct irq_chip_type *ct;
1097 unsigned int ngpios;
1103 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
1105 soc_variant = (unsigned long) match->data;
1107 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
1109 /* Some gpio controllers do not provide irq support */
1110 have_irqs = of_irq_count(np) != 0;
1112 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
1117 platform_set_drvdata(pdev, mvchip);
1119 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
1120 dev_err(&pdev->dev, "Missing ngpios OF property\n");
1124 id = of_alias_get_id(pdev->dev.of_node, "gpio");
1126 dev_err(&pdev->dev, "Couldn't get OF id\n");
1130 mvchip->clk = devm_clk_get(&pdev->dev, NULL);
1131 /* Not all SoCs require a clock.*/
1132 if (!IS_ERR(mvchip->clk))
1133 clk_prepare_enable(mvchip->clk);
1135 mvchip->soc_variant = soc_variant;
1136 mvchip->chip.label = dev_name(&pdev->dev);
1137 mvchip->chip.parent = &pdev->dev;
1138 mvchip->chip.request = gpiochip_generic_request;
1139 mvchip->chip.free = gpiochip_generic_free;
1140 mvchip->chip.get_direction = mvebu_gpio_get_direction;
1141 mvchip->chip.direction_input = mvebu_gpio_direction_input;
1142 mvchip->chip.get = mvebu_gpio_get;
1143 mvchip->chip.direction_output = mvebu_gpio_direction_output;
1144 mvchip->chip.set = mvebu_gpio_set;
1146 mvchip->chip.to_irq = mvebu_gpio_to_irq;
1147 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
1148 mvchip->chip.ngpio = ngpios;
1149 mvchip->chip.can_sleep = false;
1150 mvchip->chip.of_node = np;
1151 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
1153 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K)
1154 err = mvebu_gpio_probe_syscon(pdev, mvchip);
1156 err = mvebu_gpio_probe_raw(pdev, mvchip);
1162 * Mask and clear GPIO interrupts.
1164 switch (soc_variant) {
1165 case MVEBU_GPIO_SOC_VARIANT_ORION:
1166 case MVEBU_GPIO_SOC_VARIANT_A8K:
1167 regmap_write(mvchip->regs,
1168 GPIO_EDGE_CAUSE_OFF + mvchip->offset, 0);
1169 regmap_write(mvchip->regs,
1170 GPIO_EDGE_MASK_OFF + mvchip->offset, 0);
1171 regmap_write(mvchip->regs,
1172 GPIO_LEVEL_MASK_OFF + mvchip->offset, 0);
1174 case MVEBU_GPIO_SOC_VARIANT_MV78200:
1175 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0);
1176 for (cpu = 0; cpu < 2; cpu++) {
1177 regmap_write(mvchip->regs,
1178 GPIO_EDGE_MASK_MV78200_OFF(cpu), 0);
1179 regmap_write(mvchip->regs,
1180 GPIO_LEVEL_MASK_MV78200_OFF(cpu), 0);
1183 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1184 regmap_write(mvchip->regs, GPIO_EDGE_CAUSE_OFF, 0);
1185 regmap_write(mvchip->regs, GPIO_EDGE_MASK_OFF, 0);
1186 regmap_write(mvchip->regs, GPIO_LEVEL_MASK_OFF, 0);
1187 for (cpu = 0; cpu < 4; cpu++) {
1188 regmap_write(mvchip->percpu_regs,
1189 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu), 0);
1190 regmap_write(mvchip->percpu_regs,
1191 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu), 0);
1192 regmap_write(mvchip->percpu_regs,
1193 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu), 0);
1200 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
1202 /* Some gpio controllers do not provide irq support */
1207 irq_domain_add_linear(np, ngpios, &irq_generic_chip_ops, NULL);
1208 if (!mvchip->domain) {
1209 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
1210 mvchip->chip.label);
1214 err = irq_alloc_domain_generic_chips(
1215 mvchip->domain, ngpios, 2, np->name, handle_level_irq,
1216 IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0);
1218 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT).\n",
1219 mvchip->chip.label);
1224 * NOTE: The common accessors cannot be used because of the percpu
1225 * access to the mask registers
1227 gc = irq_get_domain_generic_chip(mvchip->domain, 0);
1228 gc->private = mvchip;
1229 ct = &gc->chip_types[0];
1230 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
1231 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
1232 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
1233 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1234 ct->chip.name = mvchip->chip.label;
1236 ct = &gc->chip_types[1];
1237 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
1238 ct->chip.irq_ack = mvebu_gpio_irq_ack;
1239 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
1240 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
1241 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1242 ct->handler = handle_edge_irq;
1243 ct->chip.name = mvchip->chip.label;
1246 * Setup the interrupt handlers. Each chip can have up to 4
1247 * interrupt handlers, with each handler dealing with 8 GPIO
1250 for (i = 0; i < 4; i++) {
1251 int irq = platform_get_irq(pdev, i);
1255 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
1259 /* Some MVEBU SoCs have simple PWM support for GPIO lines */
1260 if (IS_ENABLED(CONFIG_PWM))
1261 return mvebu_pwm_probe(pdev, mvchip, id);
1266 irq_domain_remove(mvchip->domain);
1271 static struct platform_driver mvebu_gpio_driver = {
1273 .name = "mvebu-gpio",
1274 .of_match_table = mvebu_gpio_of_match,
1276 .probe = mvebu_gpio_probe,
1277 .suspend = mvebu_gpio_suspend,
1278 .resume = mvebu_gpio_resume,
1280 builtin_platform_driver(mvebu_gpio_driver);