2 * Generic GPIO driver for logic cells found in the Nomadik SoC
4 * Copyright (C) 2008,2009 STMicroelectronics
5 * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it>
6 * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com>
7 * Copyright (C) 2011 Linus Walleij <linus.walleij@linaro.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
17 #include <linux/platform_device.h>
19 #include <linux/clk.h>
20 #include <linux/err.h>
21 #include <linux/gpio.h>
22 #include <linux/spinlock.h>
23 #include <linux/interrupt.h>
24 #include <linux/irq.h>
25 #include <linux/irqdomain.h>
26 #include <linux/slab.h>
27 #include <linux/of_device.h>
28 #include <linux/pinctrl/pinctrl.h>
29 #include <linux/pinctrl/pinmux.h>
30 #include <linux/pinctrl/pinconf.h>
31 /* Since we request GPIOs from ourself */
32 #include <linux/pinctrl/consumer.h>
34 #include <asm/mach/irq.h>
36 #include <plat/pincfg.h>
37 #include <plat/gpio-nomadik.h>
39 #include "pinctrl-nomadik.h"
42 * The GPIO module in the Nomadik family of Systems-on-Chip is an
43 * AMBA device, managing 32 pins and alternate functions. The logic block
44 * is currently used in the Nomadik and ux500.
46 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
49 #define NMK_GPIO_PER_CHIP 32
51 struct nmk_gpio_chip {
52 struct gpio_chip chip;
53 struct irq_domain *domain;
57 unsigned int parent_irq;
58 int secondary_parent_irq;
59 u32 (*get_secondary_status)(unsigned int bank);
60 void (*set_ioforce)(bool enable);
63 /* Keep track of configured edges */
77 struct pinctrl_dev *pctl;
78 const struct nmk_pinctrl_soc_data *soc;
81 static struct nmk_gpio_chip *
82 nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)];
84 static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);
86 #define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips)
88 static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
89 unsigned offset, int gpio_mode)
91 u32 bit = 1 << offset;
94 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
95 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
96 if (gpio_mode & NMK_GPIO_ALT_A)
98 if (gpio_mode & NMK_GPIO_ALT_B)
100 writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
101 writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
104 static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
105 unsigned offset, enum nmk_gpio_slpm mode)
107 u32 bit = 1 << offset;
110 slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
111 if (mode == NMK_GPIO_SLPM_NOCHANGE)
115 writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
118 static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
119 unsigned offset, enum nmk_gpio_pull pull)
121 u32 bit = 1 << offset;
124 pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
125 if (pull == NMK_GPIO_PULL_NONE) {
127 nmk_chip->pull_up &= ~bit;
132 writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
134 if (pull == NMK_GPIO_PULL_UP) {
135 nmk_chip->pull_up |= bit;
136 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
137 } else if (pull == NMK_GPIO_PULL_DOWN) {
138 nmk_chip->pull_up &= ~bit;
139 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
143 static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
144 unsigned offset, bool lowemi)
146 u32 bit = BIT(offset);
147 bool enabled = nmk_chip->lowemi & bit;
149 if (lowemi == enabled)
153 nmk_chip->lowemi |= bit;
155 nmk_chip->lowemi &= ~bit;
157 writel_relaxed(nmk_chip->lowemi,
158 nmk_chip->addr + NMK_GPIO_LOWEMI);
161 static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
164 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
167 static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip,
168 unsigned offset, int val)
171 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS);
173 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC);
176 static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
177 unsigned offset, int val)
179 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
180 __nmk_gpio_set_output(nmk_chip, offset, val);
183 static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
184 unsigned offset, int gpio_mode,
187 u32 rwimsc = nmk_chip->rwimsc;
188 u32 fwimsc = nmk_chip->fwimsc;
190 if (glitch && nmk_chip->set_ioforce) {
191 u32 bit = BIT(offset);
193 /* Prevent spurious wakeups */
194 writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
195 writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);
197 nmk_chip->set_ioforce(true);
200 __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode);
202 if (glitch && nmk_chip->set_ioforce) {
203 nmk_chip->set_ioforce(false);
205 writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC);
206 writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC);
211 nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
213 u32 falling = nmk_chip->fimsc & BIT(offset);
214 u32 rising = nmk_chip->rimsc & BIT(offset);
215 int gpio = nmk_chip->chip.base + offset;
216 int irq = NOMADIK_GPIO_TO_IRQ(gpio);
217 struct irq_data *d = irq_get_irq_data(irq);
219 if (!rising && !falling)
222 if (!d || !irqd_irq_disabled(d))
226 nmk_chip->rimsc &= ~BIT(offset);
227 writel_relaxed(nmk_chip->rimsc,
228 nmk_chip->addr + NMK_GPIO_RIMSC);
232 nmk_chip->fimsc &= ~BIT(offset);
233 writel_relaxed(nmk_chip->fimsc,
234 nmk_chip->addr + NMK_GPIO_FIMSC);
237 dev_dbg(nmk_chip->chip.dev, "%d: clearing interrupt mask\n", gpio);
240 static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
241 pin_cfg_t cfg, bool sleep, unsigned int *slpmregs)
243 static const char *afnames[] = {
244 [NMK_GPIO_ALT_GPIO] = "GPIO",
245 [NMK_GPIO_ALT_A] = "A",
246 [NMK_GPIO_ALT_B] = "B",
247 [NMK_GPIO_ALT_C] = "C"
249 static const char *pullnames[] = {
250 [NMK_GPIO_PULL_NONE] = "none",
251 [NMK_GPIO_PULL_UP] = "up",
252 [NMK_GPIO_PULL_DOWN] = "down",
253 [3] /* illegal */ = "??"
255 static const char *slpmnames[] = {
256 [NMK_GPIO_SLPM_INPUT] = "input/wakeup",
257 [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup",
260 int pin = PIN_NUM(cfg);
261 int pull = PIN_PULL(cfg);
262 int af = PIN_ALT(cfg);
263 int slpm = PIN_SLPM(cfg);
264 int output = PIN_DIR(cfg);
265 int val = PIN_VAL(cfg);
266 bool glitch = af == NMK_GPIO_ALT_C;
268 dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: af %s, pull %s, slpm %s (%s%s)\n",
269 pin, cfg, afnames[af], pullnames[pull], slpmnames[slpm],
270 output ? "output " : "input",
271 output ? (val ? "high" : "low") : "");
274 int slpm_pull = PIN_SLPM_PULL(cfg);
275 int slpm_output = PIN_SLPM_DIR(cfg);
276 int slpm_val = PIN_SLPM_VAL(cfg);
278 af = NMK_GPIO_ALT_GPIO;
281 * The SLPM_* values are normal values + 1 to allow zero to
282 * mean "same as normal".
285 pull = slpm_pull - 1;
287 output = slpm_output - 1;
291 dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n",
293 slpm_pull ? pullnames[pull] : "same",
294 slpm_output ? (output ? "output" : "input") : "same",
295 slpm_val ? (val ? "high" : "low") : "same");
299 __nmk_gpio_make_output(nmk_chip, offset, val);
301 __nmk_gpio_make_input(nmk_chip, offset);
302 __nmk_gpio_set_pull(nmk_chip, offset, pull);
305 __nmk_gpio_set_lowemi(nmk_chip, offset, PIN_LOWEMI(cfg));
308 * If the pin is switching to altfunc, and there was an interrupt
309 * installed on it which has been lazy disabled, actually mask the
310 * interrupt to prevent spurious interrupts that would occur while the
311 * pin is under control of the peripheral. Only SKE does this.
313 if (af != NMK_GPIO_ALT_GPIO)
314 nmk_gpio_disable_lazy_irq(nmk_chip, offset);
317 * If we've backed up the SLPM registers (glitch workaround), modify
318 * the backups since they will be restored.
321 if (slpm == NMK_GPIO_SLPM_NOCHANGE)
322 slpmregs[nmk_chip->bank] |= BIT(offset);
324 slpmregs[nmk_chip->bank] &= ~BIT(offset);
326 __nmk_gpio_set_slpm(nmk_chip, offset, slpm);
328 __nmk_gpio_set_mode_safe(nmk_chip, offset, af, glitch);
332 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
333 * - Save SLPM registers
334 * - Set SLPM=0 for the IOs you want to switch and others to 1
335 * - Configure the GPIO registers for the IOs that are being switched
337 * - Modify the AFLSA/B registers for the IOs that are being switched
339 * - Restore SLPM registers
340 * - Any spurious wake up event during switch sequence to be ignored and
343 static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
347 for (i = 0; i < NUM_BANKS; i++) {
348 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
349 unsigned int temp = slpm[i];
354 clk_enable(chip->clk);
356 slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
357 writel(temp, chip->addr + NMK_GPIO_SLPC);
361 static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
365 for (i = 0; i < NUM_BANKS; i++) {
366 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
371 writel(slpm[i], chip->addr + NMK_GPIO_SLPC);
373 clk_disable(chip->clk);
377 static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep)
379 static unsigned int slpm[NUM_BANKS];
385 for (i = 0; i < num; i++) {
386 if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) {
392 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
395 memset(slpm, 0xff, sizeof(slpm));
397 for (i = 0; i < num; i++) {
398 int pin = PIN_NUM(cfgs[i]);
399 int offset = pin % NMK_GPIO_PER_CHIP;
401 if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C)
402 slpm[pin / NMK_GPIO_PER_CHIP] &= ~BIT(offset);
405 nmk_gpio_glitch_slpm_init(slpm);
408 for (i = 0; i < num; i++) {
409 struct nmk_gpio_chip *nmk_chip;
410 int pin = PIN_NUM(cfgs[i]);
412 nmk_chip = nmk_gpio_chips[pin / NMK_GPIO_PER_CHIP];
418 clk_enable(nmk_chip->clk);
419 spin_lock(&nmk_chip->lock);
420 __nmk_config_pin(nmk_chip, pin % NMK_GPIO_PER_CHIP,
421 cfgs[i], sleep, glitch ? slpm : NULL);
422 spin_unlock(&nmk_chip->lock);
423 clk_disable(nmk_chip->clk);
427 nmk_gpio_glitch_slpm_restore(slpm);
429 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
435 * nmk_config_pin - configure a pin's mux attributes
436 * @cfg: pin confguration
437 * @sleep: Non-zero to apply the sleep mode configuration
438 * Configures a pin's mode (alternate function or GPIO), its pull up status,
439 * and its sleep mode based on the specified configuration. The @cfg is
440 * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These
441 * are constructed using, and can be further enhanced with, the macros in
444 * If a pin's mode is set to GPIO, it is configured as an input to avoid
445 * side-effects. The gpio can be manipulated later using standard GPIO API
448 int nmk_config_pin(pin_cfg_t cfg, bool sleep)
450 return __nmk_config_pins(&cfg, 1, sleep);
452 EXPORT_SYMBOL(nmk_config_pin);
455 * nmk_config_pins - configure several pins at once
456 * @cfgs: array of pin configurations
457 * @num: number of elments in the array
459 * Configures several pins using nmk_config_pin(). Refer to that function for
460 * further information.
462 int nmk_config_pins(pin_cfg_t *cfgs, int num)
464 return __nmk_config_pins(cfgs, num, false);
466 EXPORT_SYMBOL(nmk_config_pins);
468 int nmk_config_pins_sleep(pin_cfg_t *cfgs, int num)
470 return __nmk_config_pins(cfgs, num, true);
472 EXPORT_SYMBOL(nmk_config_pins_sleep);
475 * nmk_gpio_set_slpm() - configure the sleep mode of a pin
477 * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
479 * This register is actually in the pinmux layer, not the GPIO block itself.
480 * The GPIO1B_SLPM register defines the GPIO mode when SLEEP/DEEP-SLEEP
481 * mode is entered (i.e. when signal IOFORCE is HIGH by the platform code).
482 * Each GPIO can be configured to be forced into GPIO mode when IOFORCE is
483 * HIGH, overriding the normal setting defined by GPIO_AFSELx registers.
484 * When IOFORCE returns LOW (by software, after SLEEP/DEEP-SLEEP exit),
485 * the GPIOs return to the normal setting defined by GPIO_AFSELx registers.
487 * If @mode is NMK_GPIO_SLPM_INPUT, the corresponding GPIO is switched to GPIO
488 * mode when signal IOFORCE is HIGH (i.e. when SLEEP/DEEP-SLEEP mode is
489 * entered) regardless of the altfunction selected. Also wake-up detection is
492 * If @mode is NMK_GPIO_SLPM_NOCHANGE, the corresponding GPIO remains
493 * controlled by NMK_GPIO_DATC, NMK_GPIO_DATS, NMK_GPIO_DIR, NMK_GPIO_PDIS
494 * (for altfunction GPIO) or respective on-chip peripherals (for other
495 * altfuncs) when IOFORCE is HIGH. Also wake-up detection DISABLED.
497 * Note that enable_irq_wake() will automatically enable wakeup detection.
499 int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
501 struct nmk_gpio_chip *nmk_chip;
504 nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
508 clk_enable(nmk_chip->clk);
509 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
510 spin_lock(&nmk_chip->lock);
512 __nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP, mode);
514 spin_unlock(&nmk_chip->lock);
515 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
516 clk_disable(nmk_chip->clk);
522 * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio
524 * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE
526 * Enables/disables pull up/down on a specified pin. This only takes effect if
527 * the pin is configured as an input (either explicitly or by the alternate
530 * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is
531 * configured as an input. Otherwise, due to the way the controller registers
532 * work, this function will change the value output on the pin.
534 int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
536 struct nmk_gpio_chip *nmk_chip;
539 nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
543 clk_enable(nmk_chip->clk);
544 spin_lock_irqsave(&nmk_chip->lock, flags);
545 __nmk_gpio_set_pull(nmk_chip, gpio % NMK_GPIO_PER_CHIP, pull);
546 spin_unlock_irqrestore(&nmk_chip->lock, flags);
547 clk_disable(nmk_chip->clk);
554 * nmk_gpio_set_mode() - set the mux mode of a gpio pin
556 * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A,
557 * NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C
559 * Sets the mode of the specified pin to one of the alternate functions or
562 int nmk_gpio_set_mode(int gpio, int gpio_mode)
564 struct nmk_gpio_chip *nmk_chip;
567 nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
571 clk_enable(nmk_chip->clk);
572 spin_lock_irqsave(&nmk_chip->lock, flags);
573 __nmk_gpio_set_mode(nmk_chip, gpio % NMK_GPIO_PER_CHIP, gpio_mode);
574 spin_unlock_irqrestore(&nmk_chip->lock, flags);
575 clk_disable(nmk_chip->clk);
579 EXPORT_SYMBOL(nmk_gpio_set_mode);
581 int nmk_gpio_get_mode(int gpio)
583 struct nmk_gpio_chip *nmk_chip;
584 u32 afunc, bfunc, bit;
586 nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
590 bit = 1 << (gpio % NMK_GPIO_PER_CHIP);
592 clk_enable(nmk_chip->clk);
594 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
595 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
597 clk_disable(nmk_chip->clk);
599 return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
601 EXPORT_SYMBOL(nmk_gpio_get_mode);
605 static inline int nmk_gpio_get_bitmask(int gpio)
607 return 1 << (gpio % NMK_GPIO_PER_CHIP);
610 static void nmk_gpio_irq_ack(struct irq_data *d)
612 struct nmk_gpio_chip *nmk_chip;
614 nmk_chip = irq_data_get_irq_chip_data(d);
618 clk_enable(nmk_chip->clk);
619 writel(nmk_gpio_get_bitmask(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
620 clk_disable(nmk_chip->clk);
623 enum nmk_gpio_irq_type {
628 static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
629 int gpio, enum nmk_gpio_irq_type which,
632 u32 bitmask = nmk_gpio_get_bitmask(gpio);
638 if (which == NORMAL) {
639 rimscreg = NMK_GPIO_RIMSC;
640 fimscreg = NMK_GPIO_FIMSC;
641 rimscval = &nmk_chip->rimsc;
642 fimscval = &nmk_chip->fimsc;
644 rimscreg = NMK_GPIO_RWIMSC;
645 fimscreg = NMK_GPIO_FWIMSC;
646 rimscval = &nmk_chip->rwimsc;
647 fimscval = &nmk_chip->fwimsc;
650 /* we must individually set/clear the two edges */
651 if (nmk_chip->edge_rising & bitmask) {
653 *rimscval |= bitmask;
655 *rimscval &= ~bitmask;
656 writel(*rimscval, nmk_chip->addr + rimscreg);
658 if (nmk_chip->edge_falling & bitmask) {
660 *fimscval |= bitmask;
662 *fimscval &= ~bitmask;
663 writel(*fimscval, nmk_chip->addr + fimscreg);
667 static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
671 * Ensure WAKEUP_ENABLE is on. No need to disable it if wakeup is
672 * disabled, since setting SLPM to 1 increases power consumption, and
673 * wakeup is anyhow controlled by the RIMSC and FIMSC registers.
675 if (nmk_chip->sleepmode && on) {
676 __nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP,
677 NMK_GPIO_SLPM_WAKEUP_ENABLE);
680 __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
683 static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
685 struct nmk_gpio_chip *nmk_chip;
689 nmk_chip = irq_data_get_irq_chip_data(d);
690 bitmask = nmk_gpio_get_bitmask(d->hwirq);
694 clk_enable(nmk_chip->clk);
695 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
696 spin_lock(&nmk_chip->lock);
698 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable);
700 if (!(nmk_chip->real_wake & bitmask))
701 __nmk_gpio_set_wake(nmk_chip, d->hwirq, enable);
703 spin_unlock(&nmk_chip->lock);
704 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
705 clk_disable(nmk_chip->clk);
710 static void nmk_gpio_irq_mask(struct irq_data *d)
712 nmk_gpio_irq_maskunmask(d, false);
715 static void nmk_gpio_irq_unmask(struct irq_data *d)
717 nmk_gpio_irq_maskunmask(d, true);
720 static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
722 struct nmk_gpio_chip *nmk_chip;
726 nmk_chip = irq_data_get_irq_chip_data(d);
729 bitmask = nmk_gpio_get_bitmask(d->hwirq);
731 clk_enable(nmk_chip->clk);
732 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
733 spin_lock(&nmk_chip->lock);
735 if (irqd_irq_disabled(d))
736 __nmk_gpio_set_wake(nmk_chip, d->hwirq, on);
739 nmk_chip->real_wake |= bitmask;
741 nmk_chip->real_wake &= ~bitmask;
743 spin_unlock(&nmk_chip->lock);
744 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
745 clk_disable(nmk_chip->clk);
750 static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
752 bool enabled = !irqd_irq_disabled(d);
753 bool wake = irqd_is_wakeup_set(d);
754 struct nmk_gpio_chip *nmk_chip;
758 nmk_chip = irq_data_get_irq_chip_data(d);
759 bitmask = nmk_gpio_get_bitmask(d->hwirq);
762 if (type & IRQ_TYPE_LEVEL_HIGH)
764 if (type & IRQ_TYPE_LEVEL_LOW)
767 clk_enable(nmk_chip->clk);
768 spin_lock_irqsave(&nmk_chip->lock, flags);
771 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false);
774 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false);
776 nmk_chip->edge_rising &= ~bitmask;
777 if (type & IRQ_TYPE_EDGE_RISING)
778 nmk_chip->edge_rising |= bitmask;
780 nmk_chip->edge_falling &= ~bitmask;
781 if (type & IRQ_TYPE_EDGE_FALLING)
782 nmk_chip->edge_falling |= bitmask;
785 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true);
788 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true);
790 spin_unlock_irqrestore(&nmk_chip->lock, flags);
791 clk_disable(nmk_chip->clk);
796 static unsigned int nmk_gpio_irq_startup(struct irq_data *d)
798 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
800 clk_enable(nmk_chip->clk);
801 nmk_gpio_irq_unmask(d);
805 static void nmk_gpio_irq_shutdown(struct irq_data *d)
807 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
809 nmk_gpio_irq_mask(d);
810 clk_disable(nmk_chip->clk);
813 static struct irq_chip nmk_gpio_irq_chip = {
814 .name = "Nomadik-GPIO",
815 .irq_ack = nmk_gpio_irq_ack,
816 .irq_mask = nmk_gpio_irq_mask,
817 .irq_unmask = nmk_gpio_irq_unmask,
818 .irq_set_type = nmk_gpio_irq_set_type,
819 .irq_set_wake = nmk_gpio_irq_set_wake,
820 .irq_startup = nmk_gpio_irq_startup,
821 .irq_shutdown = nmk_gpio_irq_shutdown,
824 static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
827 struct nmk_gpio_chip *nmk_chip;
828 struct irq_chip *host_chip = irq_get_chip(irq);
829 unsigned int first_irq;
831 chained_irq_enter(host_chip, desc);
833 nmk_chip = irq_get_handler_data(irq);
834 first_irq = nmk_chip->domain->revmap_data.legacy.first_irq;
836 int bit = __ffs(status);
838 generic_handle_irq(first_irq + bit);
842 chained_irq_exit(host_chip, desc);
845 static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
847 struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
850 clk_enable(nmk_chip->clk);
851 status = readl(nmk_chip->addr + NMK_GPIO_IS);
852 clk_disable(nmk_chip->clk);
854 __nmk_gpio_irq_handler(irq, desc, status);
857 static void nmk_gpio_secondary_irq_handler(unsigned int irq,
858 struct irq_desc *desc)
860 struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
861 u32 status = nmk_chip->get_secondary_status(nmk_chip->bank);
863 __nmk_gpio_irq_handler(irq, desc, status);
866 static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
868 irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
869 irq_set_handler_data(nmk_chip->parent_irq, nmk_chip);
871 if (nmk_chip->secondary_parent_irq >= 0) {
872 irq_set_chained_handler(nmk_chip->secondary_parent_irq,
873 nmk_gpio_secondary_irq_handler);
874 irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip);
882 static int nmk_gpio_request(struct gpio_chip *chip, unsigned offset)
885 * Map back to global GPIO space and request muxing, the direction
886 * parameter does not matter for this controller.
888 int gpio = chip->base + offset;
890 return pinctrl_request_gpio(gpio);
893 static void nmk_gpio_free(struct gpio_chip *chip, unsigned offset)
895 int gpio = chip->base + offset;
897 pinctrl_free_gpio(gpio);
900 static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
902 struct nmk_gpio_chip *nmk_chip =
903 container_of(chip, struct nmk_gpio_chip, chip);
905 clk_enable(nmk_chip->clk);
907 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
909 clk_disable(nmk_chip->clk);
914 static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
916 struct nmk_gpio_chip *nmk_chip =
917 container_of(chip, struct nmk_gpio_chip, chip);
918 u32 bit = 1 << offset;
921 clk_enable(nmk_chip->clk);
923 value = (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
925 clk_disable(nmk_chip->clk);
930 static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
933 struct nmk_gpio_chip *nmk_chip =
934 container_of(chip, struct nmk_gpio_chip, chip);
936 clk_enable(nmk_chip->clk);
938 __nmk_gpio_set_output(nmk_chip, offset, val);
940 clk_disable(nmk_chip->clk);
943 static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
946 struct nmk_gpio_chip *nmk_chip =
947 container_of(chip, struct nmk_gpio_chip, chip);
949 clk_enable(nmk_chip->clk);
951 __nmk_gpio_make_output(nmk_chip, offset, val);
953 clk_disable(nmk_chip->clk);
958 static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
960 struct nmk_gpio_chip *nmk_chip =
961 container_of(chip, struct nmk_gpio_chip, chip);
963 return irq_find_mapping(nmk_chip->domain, offset);
966 #ifdef CONFIG_DEBUG_FS
968 #include <linux/seq_file.h>
970 static void nmk_gpio_dbg_show_one(struct seq_file *s, struct gpio_chip *chip,
971 unsigned offset, unsigned gpio)
973 const char *label = gpiochip_is_requested(chip, offset);
974 struct nmk_gpio_chip *nmk_chip =
975 container_of(chip, struct nmk_gpio_chip, chip);
979 u32 bit = 1 << offset;
980 const char *modes[] = {
981 [NMK_GPIO_ALT_GPIO] = "gpio",
982 [NMK_GPIO_ALT_A] = "altA",
983 [NMK_GPIO_ALT_B] = "altB",
984 [NMK_GPIO_ALT_C] = "altC",
987 clk_enable(nmk_chip->clk);
988 is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & bit);
989 pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
990 mode = nmk_gpio_get_mode(gpio);
992 seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
993 gpio, label ?: "(none)",
994 is_out ? "out" : "in ",
996 ? (chip->get(chip, offset) ? "hi" : "lo")
998 (mode < 0) ? "unknown" : modes[mode],
999 pull ? "pull" : "none");
1001 if (label && !is_out) {
1002 int irq = gpio_to_irq(gpio);
1003 struct irq_desc *desc = irq_to_desc(irq);
1005 /* This races with request_irq(), set_irq_type(),
1006 * and set_irq_wake() ... but those are "rare".
1008 if (irq >= 0 && desc->action) {
1010 u32 bitmask = nmk_gpio_get_bitmask(gpio);
1012 if (nmk_chip->edge_rising & bitmask)
1013 trigger = "edge-rising";
1014 else if (nmk_chip->edge_falling & bitmask)
1015 trigger = "edge-falling";
1017 trigger = "edge-undefined";
1019 seq_printf(s, " irq-%d %s%s",
1021 irqd_is_wakeup_set(&desc->irq_data)
1025 clk_disable(nmk_chip->clk);
1028 static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1031 unsigned gpio = chip->base;
1033 for (i = 0; i < chip->ngpio; i++, gpio++) {
1034 nmk_gpio_dbg_show_one(s, chip, i, gpio);
1035 seq_printf(s, "\n");
1040 static inline void nmk_gpio_dbg_show_one(struct seq_file *s,
1041 struct gpio_chip *chip,
1042 unsigned offset, unsigned gpio)
1045 #define nmk_gpio_dbg_show NULL
1048 /* This structure is replicated for each GPIO block allocated at probe time */
1049 static struct gpio_chip nmk_gpio_template = {
1050 .request = nmk_gpio_request,
1051 .free = nmk_gpio_free,
1052 .direction_input = nmk_gpio_make_input,
1053 .get = nmk_gpio_get_input,
1054 .direction_output = nmk_gpio_make_output,
1055 .set = nmk_gpio_set_output,
1056 .to_irq = nmk_gpio_to_irq,
1057 .dbg_show = nmk_gpio_dbg_show,
1061 void nmk_gpio_clocks_enable(void)
1065 for (i = 0; i < NUM_BANKS; i++) {
1066 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1071 clk_enable(chip->clk);
1075 void nmk_gpio_clocks_disable(void)
1079 for (i = 0; i < NUM_BANKS; i++) {
1080 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1085 clk_disable(chip->clk);
1090 * Called from the suspend/resume path to only keep the real wakeup interrupts
1091 * (those that have had set_irq_wake() called on them) as wakeup interrupts,
1092 * and not the rest of the interrupts which we needed to have as wakeups for
1095 * PM ops are not used since this needs to be done at the end, after all the
1096 * other drivers are done with their suspend callbacks.
1098 void nmk_gpio_wakeups_suspend(void)
1102 for (i = 0; i < NUM_BANKS; i++) {
1103 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1108 clk_enable(chip->clk);
1110 writel(chip->rwimsc & chip->real_wake,
1111 chip->addr + NMK_GPIO_RWIMSC);
1112 writel(chip->fwimsc & chip->real_wake,
1113 chip->addr + NMK_GPIO_FWIMSC);
1115 clk_disable(chip->clk);
1119 void nmk_gpio_wakeups_resume(void)
1123 for (i = 0; i < NUM_BANKS; i++) {
1124 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1129 clk_enable(chip->clk);
1131 writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
1132 writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);
1134 clk_disable(chip->clk);
1139 * Read the pull up/pull down status.
1140 * A bit set in 'pull_up' means that pull up
1141 * is selected if pull is enabled in PDIS register.
1142 * Note: only pull up/down set via this driver can
1143 * be detected due to HW limitations.
1145 void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
1147 if (gpio_bank < NUM_BANKS) {
1148 struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank];
1153 *pull_up = chip->pull_up;
1157 int nmk_gpio_irq_map(struct irq_domain *d, unsigned int irq,
1158 irq_hw_number_t hwirq)
1160 struct nmk_gpio_chip *nmk_chip = d->host_data;
1165 irq_set_chip_and_handler(irq, &nmk_gpio_irq_chip, handle_edge_irq);
1166 set_irq_flags(irq, IRQF_VALID);
1167 irq_set_chip_data(irq, nmk_chip);
1168 irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);
1173 const struct irq_domain_ops nmk_gpio_irq_simple_ops = {
1174 .map = nmk_gpio_irq_map,
1175 .xlate = irq_domain_xlate_twocell,
1178 static int __devinit nmk_gpio_probe(struct platform_device *dev)
1180 struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
1181 struct device_node *np = dev->dev.of_node;
1182 struct nmk_gpio_chip *nmk_chip;
1183 struct gpio_chip *chip;
1184 struct resource *res;
1191 if (!pdata && !np) {
1192 dev_err(&dev->dev, "No platform data or device tree found\n");
1197 pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
1201 if (of_get_property(np, "st,supports-sleepmode", NULL))
1202 pdata->supports_sleepmode = true;
1204 if (of_property_read_u32(np, "gpio-bank", &dev->id)) {
1205 dev_err(&dev->dev, "gpio-bank property not found\n");
1210 pdata->first_gpio = dev->id * NMK_GPIO_PER_CHIP;
1211 pdata->num_gpio = NMK_GPIO_PER_CHIP;
1214 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1220 irq = platform_get_irq(dev, 0);
1226 secondary_irq = platform_get_irq(dev, 1);
1227 if (secondary_irq >= 0 && !pdata->get_secondary_status) {
1232 base = devm_request_and_ioremap(&dev->dev, res);
1238 clk = devm_clk_get(&dev->dev, NULL);
1245 nmk_chip = devm_kzalloc(&dev->dev, sizeof(*nmk_chip), GFP_KERNEL);
1252 * The virt address in nmk_chip->addr is in the nomadik register space,
1253 * so we can simply convert the resource address, without remapping
1255 nmk_chip->bank = dev->id;
1256 nmk_chip->clk = clk;
1257 nmk_chip->addr = base;
1258 nmk_chip->chip = nmk_gpio_template;
1259 nmk_chip->parent_irq = irq;
1260 nmk_chip->secondary_parent_irq = secondary_irq;
1261 nmk_chip->get_secondary_status = pdata->get_secondary_status;
1262 nmk_chip->set_ioforce = pdata->set_ioforce;
1263 nmk_chip->sleepmode = pdata->supports_sleepmode;
1264 spin_lock_init(&nmk_chip->lock);
1266 chip = &nmk_chip->chip;
1267 chip->base = pdata->first_gpio;
1268 chip->ngpio = pdata->num_gpio;
1269 chip->label = pdata->name ?: dev_name(&dev->dev);
1270 chip->dev = &dev->dev;
1271 chip->owner = THIS_MODULE;
1273 clk_enable(nmk_chip->clk);
1274 nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
1275 clk_disable(nmk_chip->clk);
1277 #ifdef CONFIG_OF_GPIO
1281 ret = gpiochip_add(&nmk_chip->chip);
1285 BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
1287 nmk_gpio_chips[nmk_chip->bank] = nmk_chip;
1289 platform_set_drvdata(dev, nmk_chip);
1291 nmk_chip->domain = irq_domain_add_legacy(np, NMK_GPIO_PER_CHIP,
1292 NOMADIK_GPIO_TO_IRQ(pdata->first_gpio),
1293 0, &nmk_gpio_irq_simple_ops, nmk_chip);
1294 if (!nmk_chip->domain) {
1295 pr_err("%s: Failed to create irqdomain\n", np->full_name);
1300 nmk_gpio_init_irq(nmk_chip);
1302 dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);
1307 dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
1308 pdata->first_gpio, pdata->first_gpio+31);
1313 static int nmk_get_groups_cnt(struct pinctrl_dev *pctldev)
1315 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1317 return npct->soc->ngroups;
1320 static const char *nmk_get_group_name(struct pinctrl_dev *pctldev,
1323 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1325 return npct->soc->groups[selector].name;
1328 static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
1329 const unsigned **pins,
1332 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1334 *pins = npct->soc->groups[selector].pins;
1335 *num_pins = npct->soc->groups[selector].npins;
1339 static struct pinctrl_gpio_range *
1340 nmk_match_gpio_range(struct pinctrl_dev *pctldev, unsigned offset)
1342 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1345 for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
1346 struct pinctrl_gpio_range *range;
1348 range = &npct->soc->gpio_ranges[i];
1349 if (offset >= range->pin_base &&
1350 offset <= (range->pin_base + range->npins - 1))
1356 static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
1359 struct pinctrl_gpio_range *range;
1360 struct gpio_chip *chip;
1362 range = nmk_match_gpio_range(pctldev, offset);
1363 if (!range || !range->gc) {
1364 seq_printf(s, "invalid pin offset");
1368 nmk_gpio_dbg_show_one(s, chip, offset - chip->base, offset);
1371 static struct pinctrl_ops nmk_pinctrl_ops = {
1372 .get_groups_count = nmk_get_groups_cnt,
1373 .get_group_name = nmk_get_group_name,
1374 .get_group_pins = nmk_get_group_pins,
1375 .pin_dbg_show = nmk_pin_dbg_show,
1378 static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
1380 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1382 return npct->soc->nfunctions;
1385 static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev,
1388 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1390 return npct->soc->functions[function].name;
1393 static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
1395 const char * const **groups,
1396 unsigned * const num_groups)
1398 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1400 *groups = npct->soc->functions[function].groups;
1401 *num_groups = npct->soc->functions[function].ngroups;
1406 static int nmk_pmx_enable(struct pinctrl_dev *pctldev, unsigned function,
1409 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1410 const struct nmk_pingroup *g;
1411 static unsigned int slpm[NUM_BANKS];
1412 unsigned long flags;
1417 g = &npct->soc->groups[group];
1419 if (g->altsetting < 0)
1422 dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);
1425 * If we're setting altfunc C by setting both AFSLA and AFSLB to 1,
1426 * we may pass through an undesired state. In this case we take
1429 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
1430 * - Save SLPM registers (since we have a shadow register in the
1431 * nmk_chip we're using that as backup)
1432 * - Set SLPM=0 for the IOs you want to switch and others to 1
1433 * - Configure the GPIO registers for the IOs that are being switched
1435 * - Modify the AFLSA/B registers for the IOs that are being switched
1437 * - Restore SLPM registers
1438 * - Any spurious wake up event during switch sequence to be ignored
1441 * We REALLY need to save ALL slpm registers, because the external
1442 * IOFORCE will switch *all* ports to their sleepmode setting to as
1443 * to avoid glitches. (Not just one port!)
1445 glitch = (g->altsetting == NMK_GPIO_ALT_C);
1448 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
1450 /* Initially don't put any pins to sleep when switching */
1451 memset(slpm, 0xff, sizeof(slpm));
1454 * Then mask the pins that need to be sleeping now when we're
1455 * switching to the ALT C function.
1457 for (i = 0; i < g->npins; i++)
1458 slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
1459 nmk_gpio_glitch_slpm_init(slpm);
1462 for (i = 0; i < g->npins; i++) {
1463 struct pinctrl_gpio_range *range;
1464 struct nmk_gpio_chip *nmk_chip;
1465 struct gpio_chip *chip;
1468 range = nmk_match_gpio_range(pctldev, g->pins[i]);
1471 "invalid pin offset %d in group %s at index %d\n",
1472 g->pins[i], g->name, i);
1476 dev_err(npct->dev, "GPIO chip missing in range for pin offset %d in group %s at index %d\n",
1477 g->pins[i], g->name, i);
1481 nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
1482 dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);
1484 clk_enable(nmk_chip->clk);
1485 bit = g->pins[i] % NMK_GPIO_PER_CHIP;
1487 * If the pin is switching to altfunc, and there was an
1488 * interrupt installed on it which has been lazy disabled,
1489 * actually mask the interrupt to prevent spurious interrupts
1490 * that would occur while the pin is under control of the
1491 * peripheral. Only SKE does this.
1493 nmk_gpio_disable_lazy_irq(nmk_chip, bit);
1495 __nmk_gpio_set_mode_safe(nmk_chip, bit, g->altsetting, glitch);
1496 clk_disable(nmk_chip->clk);
1499 /* When all pins are successfully reconfigured we get here */
1504 nmk_gpio_glitch_slpm_restore(slpm);
1505 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
1511 static void nmk_pmx_disable(struct pinctrl_dev *pctldev,
1512 unsigned function, unsigned group)
1514 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1515 const struct nmk_pingroup *g;
1517 g = &npct->soc->groups[group];
1519 if (g->altsetting < 0)
1522 /* Poke out the mux, set the pin to some default state? */
1523 dev_dbg(npct->dev, "disable group %s, %u pins\n", g->name, g->npins);
1526 int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
1527 struct pinctrl_gpio_range *range,
1530 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1531 struct nmk_gpio_chip *nmk_chip;
1532 struct gpio_chip *chip;
1536 dev_err(npct->dev, "invalid range\n");
1540 dev_err(npct->dev, "missing GPIO chip in range\n");
1544 nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
1546 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
1548 clk_enable(nmk_chip->clk);
1549 bit = offset % NMK_GPIO_PER_CHIP;
1550 /* There is no glitch when converting any pin to GPIO */
1551 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1552 clk_disable(nmk_chip->clk);
1557 void nmk_gpio_disable_free(struct pinctrl_dev *pctldev,
1558 struct pinctrl_gpio_range *range,
1561 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1563 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
1564 /* Set the pin to some default state, GPIO is usually default */
1567 static struct pinmux_ops nmk_pinmux_ops = {
1568 .get_functions_count = nmk_pmx_get_funcs_cnt,
1569 .get_function_name = nmk_pmx_get_func_name,
1570 .get_function_groups = nmk_pmx_get_func_groups,
1571 .enable = nmk_pmx_enable,
1572 .disable = nmk_pmx_disable,
1573 .gpio_request_enable = nmk_gpio_request_enable,
1574 .gpio_disable_free = nmk_gpio_disable_free,
1577 int nmk_pin_config_get(struct pinctrl_dev *pctldev,
1579 unsigned long *config)
1581 /* Not implemented */
1585 int nmk_pin_config_set(struct pinctrl_dev *pctldev,
1587 unsigned long config)
1589 static const char *pullnames[] = {
1590 [NMK_GPIO_PULL_NONE] = "none",
1591 [NMK_GPIO_PULL_UP] = "up",
1592 [NMK_GPIO_PULL_DOWN] = "down",
1593 [3] /* illegal */ = "??"
1595 static const char *slpmnames[] = {
1596 [NMK_GPIO_SLPM_INPUT] = "input/wakeup",
1597 [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup",
1599 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1600 struct nmk_gpio_chip *nmk_chip;
1601 struct pinctrl_gpio_range *range;
1602 struct gpio_chip *chip;
1606 * The pin config contains pin number and altfunction fields, here
1607 * we just ignore that part. It's being handled by the framework and
1608 * pinmux callback respectively.
1610 pin_cfg_t cfg = (pin_cfg_t) config;
1611 int pull = PIN_PULL(cfg);
1612 int slpm = PIN_SLPM(cfg);
1613 int output = PIN_DIR(cfg);
1614 int val = PIN_VAL(cfg);
1615 bool lowemi = PIN_LOWEMI(cfg);
1616 bool gpiomode = PIN_GPIOMODE(cfg);
1617 bool sleep = PIN_SLEEPMODE(cfg);
1619 range = nmk_match_gpio_range(pctldev, pin);
1621 dev_err(npct->dev, "invalid pin offset %d\n", pin);
1625 dev_err(npct->dev, "GPIO chip missing in range for pin %d\n",
1630 nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
1633 int slpm_pull = PIN_SLPM_PULL(cfg);
1634 int slpm_output = PIN_SLPM_DIR(cfg);
1635 int slpm_val = PIN_SLPM_VAL(cfg);
1637 /* All pins go into GPIO mode at sleep */
1641 * The SLPM_* values are normal values + 1 to allow zero to
1642 * mean "same as normal".
1645 pull = slpm_pull - 1;
1647 output = slpm_output - 1;
1651 dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n",
1653 slpm_pull ? pullnames[pull] : "same",
1654 slpm_output ? (output ? "output" : "input") : "same",
1655 slpm_val ? (val ? "high" : "low") : "same");
1658 dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: pull %s, slpm %s (%s%s), lowemi %s\n",
1659 pin, cfg, pullnames[pull], slpmnames[slpm],
1660 output ? "output " : "input",
1661 output ? (val ? "high" : "low") : "",
1662 lowemi ? "on" : "off" );
1664 clk_enable(nmk_chip->clk);
1665 bit = pin % NMK_GPIO_PER_CHIP;
1667 /* No glitch when going to GPIO mode */
1668 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1670 __nmk_gpio_make_output(nmk_chip, bit, val);
1672 __nmk_gpio_make_input(nmk_chip, bit);
1673 __nmk_gpio_set_pull(nmk_chip, bit, pull);
1675 /* TODO: isn't this only applicable on output pins? */
1676 __nmk_gpio_set_lowemi(nmk_chip, bit, lowemi);
1678 __nmk_gpio_set_slpm(nmk_chip, bit, slpm);
1679 clk_disable(nmk_chip->clk);
1683 static struct pinconf_ops nmk_pinconf_ops = {
1684 .pin_config_get = nmk_pin_config_get,
1685 .pin_config_set = nmk_pin_config_set,
1688 static struct pinctrl_desc nmk_pinctrl_desc = {
1689 .name = "pinctrl-nomadik",
1690 .pctlops = &nmk_pinctrl_ops,
1691 .pmxops = &nmk_pinmux_ops,
1692 .confops = &nmk_pinconf_ops,
1693 .owner = THIS_MODULE,
1696 static const struct of_device_id nmk_pinctrl_match[] = {
1698 .compatible = "stericsson,nmk_pinctrl",
1699 .data = (void *)PINCTRL_NMK_DB8500,
1704 static int __devinit nmk_pinctrl_probe(struct platform_device *pdev)
1706 const struct platform_device_id *platid = platform_get_device_id(pdev);
1707 struct device_node *np = pdev->dev.of_node;
1708 struct nmk_pinctrl *npct;
1709 unsigned int version = 0;
1712 npct = devm_kzalloc(&pdev->dev, sizeof(*npct), GFP_KERNEL);
1717 version = platid->driver_data;
1719 version = (unsigned int)
1720 of_match_device(nmk_pinctrl_match, &pdev->dev)->data;
1722 /* Poke in other ASIC variants here */
1723 if (version == PINCTRL_NMK_DB8500)
1724 nmk_pinctrl_db8500_init(&npct->soc);
1727 * We need all the GPIO drivers to probe FIRST, or we will not be able
1728 * to obtain references to the struct gpio_chip * for them, and we
1729 * need this to proceed.
1731 for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
1732 if (!nmk_gpio_chips[i]) {
1733 dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
1734 devm_kfree(&pdev->dev, npct);
1735 return -EPROBE_DEFER;
1737 npct->soc->gpio_ranges[i].gc = &nmk_gpio_chips[i]->chip;
1740 nmk_pinctrl_desc.pins = npct->soc->pins;
1741 nmk_pinctrl_desc.npins = npct->soc->npins;
1742 npct->dev = &pdev->dev;
1743 npct->pctl = pinctrl_register(&nmk_pinctrl_desc, &pdev->dev, npct);
1745 dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n");
1749 /* We will handle a range of GPIO pins */
1750 for (i = 0; i < npct->soc->gpio_num_ranges; i++)
1751 pinctrl_add_gpio_range(npct->pctl, &npct->soc->gpio_ranges[i]);
1753 platform_set_drvdata(pdev, npct);
1754 dev_info(&pdev->dev, "initialized Nomadik pin control driver\n");
1759 static const struct of_device_id nmk_gpio_match[] = {
1760 { .compatible = "st,nomadik-gpio", },
1764 static struct platform_driver nmk_gpio_driver = {
1766 .owner = THIS_MODULE,
1768 .of_match_table = nmk_gpio_match,
1770 .probe = nmk_gpio_probe,
1773 static const struct platform_device_id nmk_pinctrl_id[] = {
1774 { "pinctrl-stn8815", PINCTRL_NMK_STN8815 },
1775 { "pinctrl-db8500", PINCTRL_NMK_DB8500 },
1778 static struct platform_driver nmk_pinctrl_driver = {
1780 .owner = THIS_MODULE,
1781 .name = "pinctrl-nomadik",
1782 .of_match_table = nmk_pinctrl_match,
1784 .probe = nmk_pinctrl_probe,
1785 .id_table = nmk_pinctrl_id,
1788 static int __init nmk_gpio_init(void)
1792 ret = platform_driver_register(&nmk_gpio_driver);
1795 return platform_driver_register(&nmk_pinctrl_driver);
1798 core_initcall(nmk_gpio_init);
1800 MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
1801 MODULE_DESCRIPTION("Nomadik GPIO Driver");
1802 MODULE_LICENSE("GPL");