2 * GPIO driver for Marvell SoCs
4 * Copyright (C) 2012 Marvell
6 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
7 * Andrew Lunn <andrew@lunn.ch>
8 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
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/err.h>
37 #include <linux/init.h>
38 #include <linux/gpio.h>
39 #include <linux/irq.h>
40 #include <linux/slab.h>
41 #include <linux/irqdomain.h>
43 #include <linux/of_irq.h>
44 #include <linux/of_device.h>
45 #include <linux/pwm.h>
46 #include <linux/clk.h>
47 #include <linux/pinctrl/consumer.h>
48 #include <linux/irqchip/chained_irq.h>
49 #include <linux/platform_device.h>
50 #include <linux/bitops.h>
55 * GPIO unit register offsets.
57 #define GPIO_OUT_OFF 0x0000
58 #define GPIO_IO_CONF_OFF 0x0004
59 #define GPIO_BLINK_EN_OFF 0x0008
60 #define GPIO_IN_POL_OFF 0x000c
61 #define GPIO_DATA_IN_OFF 0x0010
62 #define GPIO_EDGE_CAUSE_OFF 0x0014
63 #define GPIO_EDGE_MASK_OFF 0x0018
64 #define GPIO_LEVEL_MASK_OFF 0x001c
65 #define GPIO_BLINK_CNT_SELECT_OFF 0x0020
68 * PWM register offsets.
70 #define PWM_BLINK_ON_DURATION_OFF 0x0
71 #define PWM_BLINK_OFF_DURATION_OFF 0x4
74 /* The MV78200 has per-CPU registers for edge mask and level mask */
75 #define GPIO_EDGE_MASK_MV78200_OFF(cpu) ((cpu) ? 0x30 : 0x18)
76 #define GPIO_LEVEL_MASK_MV78200_OFF(cpu) ((cpu) ? 0x34 : 0x1C)
79 * The Armada XP has per-CPU registers for interrupt cause, interrupt
80 * mask and interrupt level mask. Those are relative to the
83 #define GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu) ((cpu) * 0x4)
84 #define GPIO_EDGE_MASK_ARMADAXP_OFF(cpu) (0x10 + (cpu) * 0x4)
85 #define GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu) (0x20 + (cpu) * 0x4)
87 #define MVEBU_GPIO_SOC_VARIANT_ORION 0x1
88 #define MVEBU_GPIO_SOC_VARIANT_MV78200 0x2
89 #define MVEBU_GPIO_SOC_VARIANT_ARMADAXP 0x3
91 #define MVEBU_MAX_GPIO_PER_BANK 32
94 void __iomem *membase;
95 unsigned long clk_rate;
96 struct gpio_desc *gpiod;
99 struct mvebu_gpio_chip *mvchip;
101 /* Used to preserve GPIO/PWM registers across suspend/resume */
103 u32 blink_on_duration;
104 u32 blink_off_duration;
107 struct mvebu_gpio_chip {
108 struct gpio_chip chip;
110 void __iomem *membase;
111 void __iomem *percpu_membase;
113 struct irq_domain *domain;
116 /* Used for PWM support */
118 struct mvebu_pwm *mvpwm;
120 /* Used to preserve GPIO registers across suspend/resume */
125 u32 edge_mask_regs[4];
126 u32 level_mask_regs[4];
130 * Functions returning addresses of individual registers for a given
133 static void __iomem *mvebu_gpioreg_out(struct mvebu_gpio_chip *mvchip)
135 return mvchip->membase + GPIO_OUT_OFF;
138 static void __iomem *mvebu_gpioreg_blink(struct mvebu_gpio_chip *mvchip)
140 return mvchip->membase + GPIO_BLINK_EN_OFF;
143 static void __iomem *mvebu_gpioreg_blink_counter_select(struct mvebu_gpio_chip
146 return mvchip->membase + GPIO_BLINK_CNT_SELECT_OFF;
149 static void __iomem *mvebu_gpioreg_io_conf(struct mvebu_gpio_chip *mvchip)
151 return mvchip->membase + GPIO_IO_CONF_OFF;
154 static void __iomem *mvebu_gpioreg_in_pol(struct mvebu_gpio_chip *mvchip)
156 return mvchip->membase + GPIO_IN_POL_OFF;
159 static void __iomem *mvebu_gpioreg_data_in(struct mvebu_gpio_chip *mvchip)
161 return mvchip->membase + GPIO_DATA_IN_OFF;
164 static void __iomem *mvebu_gpioreg_edge_cause(struct mvebu_gpio_chip *mvchip)
168 switch (mvchip->soc_variant) {
169 case MVEBU_GPIO_SOC_VARIANT_ORION:
170 case MVEBU_GPIO_SOC_VARIANT_MV78200:
171 return mvchip->membase + GPIO_EDGE_CAUSE_OFF;
172 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
173 cpu = smp_processor_id();
174 return mvchip->percpu_membase +
175 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu);
181 static void __iomem *mvebu_gpioreg_edge_mask(struct mvebu_gpio_chip *mvchip)
185 switch (mvchip->soc_variant) {
186 case MVEBU_GPIO_SOC_VARIANT_ORION:
187 return mvchip->membase + GPIO_EDGE_MASK_OFF;
188 case MVEBU_GPIO_SOC_VARIANT_MV78200:
189 cpu = smp_processor_id();
190 return mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(cpu);
191 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
192 cpu = smp_processor_id();
193 return mvchip->percpu_membase +
194 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu);
200 static void __iomem *mvebu_gpioreg_level_mask(struct mvebu_gpio_chip *mvchip)
204 switch (mvchip->soc_variant) {
205 case MVEBU_GPIO_SOC_VARIANT_ORION:
206 return mvchip->membase + GPIO_LEVEL_MASK_OFF;
207 case MVEBU_GPIO_SOC_VARIANT_MV78200:
208 cpu = smp_processor_id();
209 return mvchip->membase + GPIO_LEVEL_MASK_MV78200_OFF(cpu);
210 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
211 cpu = smp_processor_id();
212 return mvchip->percpu_membase +
213 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu);
220 * Functions returning addresses of individual registers for a given
223 static void __iomem *mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm)
225 return mvpwm->membase + PWM_BLINK_ON_DURATION_OFF;
228 static void __iomem *mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm)
230 return mvpwm->membase + PWM_BLINK_OFF_DURATION_OFF;
234 * Functions implementing the gpio_chip methods
236 static void mvebu_gpio_set(struct gpio_chip *chip, unsigned int pin, int value)
238 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
242 spin_lock_irqsave(&mvchip->lock, flags);
243 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
248 writel_relaxed(u, mvebu_gpioreg_out(mvchip));
249 spin_unlock_irqrestore(&mvchip->lock, flags);
252 static int mvebu_gpio_get(struct gpio_chip *chip, unsigned int pin)
254 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
257 if (readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & BIT(pin)) {
258 u = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) ^
259 readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
261 u = readl_relaxed(mvebu_gpioreg_out(mvchip));
264 return (u >> pin) & 1;
267 static void mvebu_gpio_blink(struct gpio_chip *chip, unsigned int pin,
270 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
274 spin_lock_irqsave(&mvchip->lock, flags);
275 u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
280 writel_relaxed(u, mvebu_gpioreg_blink(mvchip));
281 spin_unlock_irqrestore(&mvchip->lock, flags);
284 static int mvebu_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
286 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
292 * Check with the pinctrl driver whether this pin is usable as
295 ret = pinctrl_gpio_direction_input(chip->base + pin);
299 spin_lock_irqsave(&mvchip->lock, flags);
300 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
302 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
303 spin_unlock_irqrestore(&mvchip->lock, flags);
308 static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
311 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
317 * Check with the pinctrl driver whether this pin is usable as
320 ret = pinctrl_gpio_direction_output(chip->base + pin);
324 mvebu_gpio_blink(chip, pin, 0);
325 mvebu_gpio_set(chip, pin, value);
327 spin_lock_irqsave(&mvchip->lock, flags);
328 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
330 writel_relaxed(u, mvebu_gpioreg_io_conf(mvchip));
331 spin_unlock_irqrestore(&mvchip->lock, flags);
336 static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin)
338 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
340 return irq_create_mapping(mvchip->domain, pin);
344 * Functions implementing the irq_chip methods
346 static void mvebu_gpio_irq_ack(struct irq_data *d)
348 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
349 struct mvebu_gpio_chip *mvchip = gc->private;
353 writel_relaxed(~mask, mvebu_gpioreg_edge_cause(mvchip));
357 static void mvebu_gpio_edge_irq_mask(struct irq_data *d)
359 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
360 struct mvebu_gpio_chip *mvchip = gc->private;
361 struct irq_chip_type *ct = irq_data_get_chip_type(d);
365 ct->mask_cache_priv &= ~mask;
367 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
371 static void mvebu_gpio_edge_irq_unmask(struct irq_data *d)
373 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
374 struct mvebu_gpio_chip *mvchip = gc->private;
375 struct irq_chip_type *ct = irq_data_get_chip_type(d);
379 ct->mask_cache_priv |= mask;
380 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_edge_mask(mvchip));
384 static void mvebu_gpio_level_irq_mask(struct irq_data *d)
386 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
387 struct mvebu_gpio_chip *mvchip = gc->private;
388 struct irq_chip_type *ct = irq_data_get_chip_type(d);
392 ct->mask_cache_priv &= ~mask;
393 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
397 static void mvebu_gpio_level_irq_unmask(struct irq_data *d)
399 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
400 struct mvebu_gpio_chip *mvchip = gc->private;
401 struct irq_chip_type *ct = irq_data_get_chip_type(d);
405 ct->mask_cache_priv |= mask;
406 writel_relaxed(ct->mask_cache_priv, mvebu_gpioreg_level_mask(mvchip));
410 /*****************************************************************************
413 * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
414 * value of the line or the opposite value.
416 * Level IRQ handlers: DATA_IN is used directly as cause register.
417 * Interrupt are masked by LEVEL_MASK registers.
418 * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
419 * Interrupt are masked by EDGE_MASK registers.
420 * Both-edge handlers: Similar to regular Edge handlers, but also swaps
421 * the polarity to catch the next line transaction.
422 * This is a race condition that might not perfectly
423 * work on some use cases.
425 * Every eight GPIO lines are grouped (OR'ed) before going up to main
429 * data-in /--------| |-----| |----\
430 * -----| |----- ---- to main cause reg
431 * X \----------------| |----/
432 * polarity LEVEL mask
434 ****************************************************************************/
436 static int mvebu_gpio_irq_set_type(struct irq_data *d, unsigned int type)
438 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
439 struct irq_chip_type *ct = irq_data_get_chip_type(d);
440 struct mvebu_gpio_chip *mvchip = gc->private;
446 u = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)) & BIT(pin);
450 type &= IRQ_TYPE_SENSE_MASK;
451 if (type == IRQ_TYPE_NONE)
454 /* Check if we need to change chip and handler */
455 if (!(ct->type & type))
456 if (irq_setup_alt_chip(d, type))
460 * Configure interrupt polarity.
463 case IRQ_TYPE_EDGE_RISING:
464 case IRQ_TYPE_LEVEL_HIGH:
465 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
467 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
469 case IRQ_TYPE_EDGE_FALLING:
470 case IRQ_TYPE_LEVEL_LOW:
471 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
473 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
475 case IRQ_TYPE_EDGE_BOTH: {
478 v = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)) ^
479 readl_relaxed(mvebu_gpioreg_data_in(mvchip));
482 * set initial polarity based on current input level
484 u = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
486 u |= BIT(pin); /* falling */
488 u &= ~BIT(pin); /* rising */
489 writel_relaxed(u, mvebu_gpioreg_in_pol(mvchip));
496 static void mvebu_gpio_irq_handler(struct irq_desc *desc)
498 struct mvebu_gpio_chip *mvchip = irq_desc_get_handler_data(desc);
499 struct irq_chip *chip = irq_desc_get_chip(desc);
506 chained_irq_enter(chip, desc);
508 cause = readl_relaxed(mvebu_gpioreg_data_in(mvchip)) &
509 readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
510 cause |= readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)) &
511 readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
513 for (i = 0; i < mvchip->chip.ngpio; i++) {
516 irq = irq_find_mapping(mvchip->domain, i);
518 if (!(cause & BIT(i)))
521 type = irq_get_trigger_type(irq);
522 if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
523 /* Swap polarity (race with GPIO line) */
526 polarity = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
528 writel_relaxed(polarity, mvebu_gpioreg_in_pol(mvchip));
531 generic_handle_irq(irq);
534 chained_irq_exit(chip, desc);
538 * Functions implementing the pwm_chip methods
540 static struct mvebu_pwm *to_mvebu_pwm(struct pwm_chip *chip)
542 return container_of(chip, struct mvebu_pwm, chip);
545 static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
547 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
548 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
549 struct gpio_desc *desc;
553 spin_lock_irqsave(&mvpwm->lock, flags);
558 desc = gpio_to_desc(mvchip->chip.base + pwm->hwpwm);
564 ret = gpiod_request(desc, "mvebu-pwm");
568 ret = gpiod_direction_output(desc, 0);
577 spin_unlock_irqrestore(&mvpwm->lock, flags);
581 static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
583 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
586 spin_lock_irqsave(&mvpwm->lock, flags);
587 gpiod_free(mvpwm->gpiod);
589 spin_unlock_irqrestore(&mvpwm->lock, flags);
592 static void mvebu_pwm_get_state(struct pwm_chip *chip,
593 struct pwm_device *pwm,
594 struct pwm_state *state) {
596 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
597 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
598 unsigned long long val;
602 spin_lock_irqsave(&mvpwm->lock, flags);
604 val = (unsigned long long)
605 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
607 do_div(val, mvpwm->clk_rate);
609 state->duty_cycle = UINT_MAX;
611 state->duty_cycle = val;
613 state->duty_cycle = 1;
615 val = (unsigned long long)
616 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
618 do_div(val, mvpwm->clk_rate);
619 if (val < state->duty_cycle) {
622 val -= state->duty_cycle;
624 state->period = UINT_MAX;
631 u = readl_relaxed(mvebu_gpioreg_blink(mvchip));
633 state->enabled = true;
635 state->enabled = false;
637 spin_unlock_irqrestore(&mvpwm->lock, flags);
640 static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
641 struct pwm_state *state)
643 struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip);
644 struct mvebu_gpio_chip *mvchip = mvpwm->mvchip;
645 unsigned long long val;
647 unsigned int on, off;
649 val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle;
650 do_div(val, NSEC_PER_SEC);
658 val = (unsigned long long) mvpwm->clk_rate *
659 (state->period - state->duty_cycle);
660 do_div(val, NSEC_PER_SEC);
668 spin_lock_irqsave(&mvpwm->lock, flags);
670 writel_relaxed(on, mvebu_pwmreg_blink_on_duration(mvpwm));
671 writel_relaxed(off, mvebu_pwmreg_blink_off_duration(mvpwm));
673 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1);
675 mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0);
677 spin_unlock_irqrestore(&mvpwm->lock, flags);
682 static const struct pwm_ops mvebu_pwm_ops = {
683 .request = mvebu_pwm_request,
684 .free = mvebu_pwm_free,
685 .get_state = mvebu_pwm_get_state,
686 .apply = mvebu_pwm_apply,
687 .owner = THIS_MODULE,
690 static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
692 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
694 mvpwm->blink_select =
695 readl_relaxed(mvebu_gpioreg_blink_counter_select(mvchip));
696 mvpwm->blink_on_duration =
697 readl_relaxed(mvebu_pwmreg_blink_on_duration(mvpwm));
698 mvpwm->blink_off_duration =
699 readl_relaxed(mvebu_pwmreg_blink_off_duration(mvpwm));
702 static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)
704 struct mvebu_pwm *mvpwm = mvchip->mvpwm;
706 writel_relaxed(mvpwm->blink_select,
707 mvebu_gpioreg_blink_counter_select(mvchip));
708 writel_relaxed(mvpwm->blink_on_duration,
709 mvebu_pwmreg_blink_on_duration(mvpwm));
710 writel_relaxed(mvpwm->blink_off_duration,
711 mvebu_pwmreg_blink_off_duration(mvpwm));
714 static int mvebu_pwm_probe(struct platform_device *pdev,
715 struct mvebu_gpio_chip *mvchip,
718 struct device *dev = &pdev->dev;
719 struct mvebu_pwm *mvpwm;
720 struct resource *res;
723 if (!of_device_is_compatible(mvchip->chip.of_node,
724 "marvell,armada-370-xp-gpio"))
727 if (IS_ERR(mvchip->clk))
728 return PTR_ERR(mvchip->clk);
731 * There are only two sets of PWM configuration registers for
732 * all the GPIO lines on those SoCs which this driver reserves
733 * for the first two GPIO chips. So if the resource is missing
734 * we can't treat it as an error.
736 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm");
741 * Use set A for lines of GPIO chip with id 0, B for GPIO chip
742 * with id 1. Don't allow further GPIO chips to be used for PWM.
750 writel_relaxed(set, mvebu_gpioreg_blink_counter_select(mvchip));
752 mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL);
755 mvchip->mvpwm = mvpwm;
756 mvpwm->mvchip = mvchip;
758 mvpwm->membase = devm_ioremap_resource(dev, res);
759 if (IS_ERR(mvpwm->membase))
760 return PTR_ERR(mvpwm->membase);
762 mvpwm->clk_rate = clk_get_rate(mvchip->clk);
763 if (!mvpwm->clk_rate) {
764 dev_err(dev, "failed to get clock rate\n");
768 mvpwm->chip.dev = dev;
769 mvpwm->chip.ops = &mvebu_pwm_ops;
770 mvpwm->chip.npwm = mvchip->chip.ngpio;
772 * There may already be some PWM allocated, so we can't force
773 * mvpwm->chip.base to a fixed point like mvchip->chip.base.
774 * So, we let pwmchip_add() do the numbering and take the next free
777 mvpwm->chip.base = -1;
779 spin_lock_init(&mvpwm->lock);
781 return pwmchip_add(&mvpwm->chip);
784 #ifdef CONFIG_DEBUG_FS
785 #include <linux/seq_file.h>
787 static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
789 struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
790 u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk;
793 out = readl_relaxed(mvebu_gpioreg_out(mvchip));
794 io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip));
795 blink = readl_relaxed(mvebu_gpioreg_blink(mvchip));
796 in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip));
797 data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip));
798 cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip));
799 edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip));
800 lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip));
802 for (i = 0; i < chip->ngpio; i++) {
807 label = gpiochip_is_requested(chip, i);
812 is_out = !(io_conf & msk);
814 seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label);
817 seq_printf(s, " out %s %s\n",
818 out & msk ? "hi" : "lo",
819 blink & msk ? "(blink )" : "");
823 seq_printf(s, " in %s (act %s) - IRQ",
824 (data_in ^ in_pol) & msk ? "hi" : "lo",
825 in_pol & msk ? "lo" : "hi");
826 if (!((edg_msk | lvl_msk) & msk)) {
827 seq_puts(s, " disabled\n");
831 seq_puts(s, " edge ");
833 seq_puts(s, " level");
834 seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear ");
838 #define mvebu_gpio_dbg_show NULL
841 static const struct of_device_id mvebu_gpio_of_match[] = {
843 .compatible = "marvell,orion-gpio",
844 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
847 .compatible = "marvell,mv78200-gpio",
848 .data = (void *) MVEBU_GPIO_SOC_VARIANT_MV78200,
851 .compatible = "marvell,armadaxp-gpio",
852 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ARMADAXP,
855 .compatible = "marvell,armada-370-xp-gpio",
856 .data = (void *) MVEBU_GPIO_SOC_VARIANT_ORION,
863 static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
865 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
868 mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
869 mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
870 mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
871 mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
873 switch (mvchip->soc_variant) {
874 case MVEBU_GPIO_SOC_VARIANT_ORION:
875 mvchip->edge_mask_regs[0] =
876 readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
877 mvchip->level_mask_regs[0] =
878 readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
880 case MVEBU_GPIO_SOC_VARIANT_MV78200:
881 for (i = 0; i < 2; i++) {
882 mvchip->edge_mask_regs[i] =
883 readl(mvchip->membase +
884 GPIO_EDGE_MASK_MV78200_OFF(i));
885 mvchip->level_mask_regs[i] =
886 readl(mvchip->membase +
887 GPIO_LEVEL_MASK_MV78200_OFF(i));
890 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
891 for (i = 0; i < 4; i++) {
892 mvchip->edge_mask_regs[i] =
893 readl(mvchip->membase +
894 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
895 mvchip->level_mask_regs[i] =
896 readl(mvchip->membase +
897 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
904 if (IS_ENABLED(CONFIG_PWM))
905 mvebu_pwm_suspend(mvchip);
910 static int mvebu_gpio_resume(struct platform_device *pdev)
912 struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
915 writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
916 writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
917 writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
918 writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
920 switch (mvchip->soc_variant) {
921 case MVEBU_GPIO_SOC_VARIANT_ORION:
922 writel(mvchip->edge_mask_regs[0],
923 mvchip->membase + GPIO_EDGE_MASK_OFF);
924 writel(mvchip->level_mask_regs[0],
925 mvchip->membase + GPIO_LEVEL_MASK_OFF);
927 case MVEBU_GPIO_SOC_VARIANT_MV78200:
928 for (i = 0; i < 2; i++) {
929 writel(mvchip->edge_mask_regs[i],
930 mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
931 writel(mvchip->level_mask_regs[i],
933 GPIO_LEVEL_MASK_MV78200_OFF(i));
936 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
937 for (i = 0; i < 4; i++) {
938 writel(mvchip->edge_mask_regs[i],
940 GPIO_EDGE_MASK_ARMADAXP_OFF(i));
941 writel(mvchip->level_mask_regs[i],
943 GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
950 if (IS_ENABLED(CONFIG_PWM))
951 mvebu_pwm_resume(mvchip);
956 static int mvebu_gpio_probe(struct platform_device *pdev)
958 struct mvebu_gpio_chip *mvchip;
959 const struct of_device_id *match;
960 struct device_node *np = pdev->dev.of_node;
961 struct resource *res;
962 struct irq_chip_generic *gc;
963 struct irq_chip_type *ct;
970 match = of_match_device(mvebu_gpio_of_match, &pdev->dev);
972 soc_variant = (unsigned long) match->data;
974 soc_variant = MVEBU_GPIO_SOC_VARIANT_ORION;
976 /* Some gpio controllers do not provide irq support */
977 have_irqs = of_irq_count(np) != 0;
979 mvchip = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_gpio_chip),
984 platform_set_drvdata(pdev, mvchip);
986 if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
987 dev_err(&pdev->dev, "Missing ngpios OF property\n");
991 id = of_alias_get_id(pdev->dev.of_node, "gpio");
993 dev_err(&pdev->dev, "Couldn't get OF id\n");
997 mvchip->clk = devm_clk_get(&pdev->dev, NULL);
998 /* Not all SoCs require a clock.*/
999 if (!IS_ERR(mvchip->clk))
1000 clk_prepare_enable(mvchip->clk);
1002 mvchip->soc_variant = soc_variant;
1003 mvchip->chip.label = dev_name(&pdev->dev);
1004 mvchip->chip.parent = &pdev->dev;
1005 mvchip->chip.request = gpiochip_generic_request;
1006 mvchip->chip.free = gpiochip_generic_free;
1007 mvchip->chip.direction_input = mvebu_gpio_direction_input;
1008 mvchip->chip.get = mvebu_gpio_get;
1009 mvchip->chip.direction_output = mvebu_gpio_direction_output;
1010 mvchip->chip.set = mvebu_gpio_set;
1012 mvchip->chip.to_irq = mvebu_gpio_to_irq;
1013 mvchip->chip.base = id * MVEBU_MAX_GPIO_PER_BANK;
1014 mvchip->chip.ngpio = ngpios;
1015 mvchip->chip.can_sleep = false;
1016 mvchip->chip.of_node = np;
1017 mvchip->chip.dbg_show = mvebu_gpio_dbg_show;
1019 spin_lock_init(&mvchip->lock);
1020 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1021 mvchip->membase = devm_ioremap_resource(&pdev->dev, res);
1022 if (IS_ERR(mvchip->membase))
1023 return PTR_ERR(mvchip->membase);
1026 * The Armada XP has a second range of registers for the
1029 if (soc_variant == MVEBU_GPIO_SOC_VARIANT_ARMADAXP) {
1030 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1031 mvchip->percpu_membase = devm_ioremap_resource(&pdev->dev,
1033 if (IS_ERR(mvchip->percpu_membase))
1034 return PTR_ERR(mvchip->percpu_membase);
1038 * Mask and clear GPIO interrupts.
1040 switch (soc_variant) {
1041 case MVEBU_GPIO_SOC_VARIANT_ORION:
1042 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
1043 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
1044 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
1046 case MVEBU_GPIO_SOC_VARIANT_MV78200:
1047 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
1048 for (cpu = 0; cpu < 2; cpu++) {
1049 writel_relaxed(0, mvchip->membase +
1050 GPIO_EDGE_MASK_MV78200_OFF(cpu));
1051 writel_relaxed(0, mvchip->membase +
1052 GPIO_LEVEL_MASK_MV78200_OFF(cpu));
1055 case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
1056 writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
1057 writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
1058 writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);
1059 for (cpu = 0; cpu < 4; cpu++) {
1060 writel_relaxed(0, mvchip->percpu_membase +
1061 GPIO_EDGE_CAUSE_ARMADAXP_OFF(cpu));
1062 writel_relaxed(0, mvchip->percpu_membase +
1063 GPIO_EDGE_MASK_ARMADAXP_OFF(cpu));
1064 writel_relaxed(0, mvchip->percpu_membase +
1065 GPIO_LEVEL_MASK_ARMADAXP_OFF(cpu));
1072 devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
1074 /* Some gpio controllers do not provide irq support */
1079 irq_domain_add_linear(np, ngpios, &irq_generic_chip_ops, NULL);
1080 if (!mvchip->domain) {
1081 dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
1082 mvchip->chip.label);
1086 err = irq_alloc_domain_generic_chips(
1087 mvchip->domain, ngpios, 2, np->name, handle_level_irq,
1088 IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_LEVEL, 0, 0);
1090 dev_err(&pdev->dev, "couldn't allocate irq chips %s (DT).\n",
1091 mvchip->chip.label);
1096 * NOTE: The common accessors cannot be used because of the percpu
1097 * access to the mask registers
1099 gc = irq_get_domain_generic_chip(mvchip->domain, 0);
1100 gc->private = mvchip;
1101 ct = &gc->chip_types[0];
1102 ct->type = IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW;
1103 ct->chip.irq_mask = mvebu_gpio_level_irq_mask;
1104 ct->chip.irq_unmask = mvebu_gpio_level_irq_unmask;
1105 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1106 ct->chip.name = mvchip->chip.label;
1108 ct = &gc->chip_types[1];
1109 ct->type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
1110 ct->chip.irq_ack = mvebu_gpio_irq_ack;
1111 ct->chip.irq_mask = mvebu_gpio_edge_irq_mask;
1112 ct->chip.irq_unmask = mvebu_gpio_edge_irq_unmask;
1113 ct->chip.irq_set_type = mvebu_gpio_irq_set_type;
1114 ct->handler = handle_edge_irq;
1115 ct->chip.name = mvchip->chip.label;
1118 * Setup the interrupt handlers. Each chip can have up to 4
1119 * interrupt handlers, with each handler dealing with 8 GPIO
1122 for (i = 0; i < 4; i++) {
1123 int irq = platform_get_irq(pdev, i);
1127 irq_set_chained_handler_and_data(irq, mvebu_gpio_irq_handler,
1131 /* Armada 370/XP has simple PWM support for GPIO lines */
1132 if (IS_ENABLED(CONFIG_PWM))
1133 return mvebu_pwm_probe(pdev, mvchip, id);
1138 irq_domain_remove(mvchip->domain);
1143 static struct platform_driver mvebu_gpio_driver = {
1145 .name = "mvebu-gpio",
1146 .of_match_table = mvebu_gpio_of_match,
1148 .probe = mvebu_gpio_probe,
1149 .suspend = mvebu_gpio_suspend,
1150 .resume = mvebu_gpio_resume,
1152 builtin_platform_driver(mvebu_gpio_driver);