1 // SPDX-License-Identifier: GPL-2.0-only
3 * Generic GPIO driver for logic cells found in the Nomadik SoC
5 * Copyright (C) 2008,2009 STMicroelectronics
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/device.h>
13 #include <linux/platform_device.h>
15 #include <linux/clk.h>
16 #include <linux/err.h>
17 #include <linux/gpio/driver.h>
18 #include <linux/spinlock.h>
19 #include <linux/interrupt.h>
20 #include <linux/slab.h>
21 #include <linux/of_device.h>
22 #include <linux/of_address.h>
23 #include <linux/bitops.h>
24 #include <linux/pinctrl/machine.h>
25 #include <linux/pinctrl/pinctrl.h>
26 #include <linux/pinctrl/pinmux.h>
27 #include <linux/pinctrl/pinconf.h>
28 /* Since we request GPIOs from ourself */
29 #include <linux/pinctrl/consumer.h>
30 #include "pinctrl-nomadik.h"
32 #include "../pinctrl-utils.h"
35 * The GPIO module in the Nomadik family of Systems-on-Chip is an
36 * AMBA device, managing 32 pins and alternate functions. The logic block
37 * is currently used in the Nomadik and ux500.
39 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
43 * pin configurations are represented by 32-bit integers:
45 * bit 0.. 8 - Pin Number (512 Pins Maximum)
46 * bit 9..10 - Alternate Function Selection
47 * bit 11..12 - Pull up/down state
48 * bit 13 - Sleep mode behaviour
50 * bit 15 - Value (if output)
51 * bit 16..18 - SLPM pull up/down state
52 * bit 19..20 - SLPM direction
53 * bit 21..22 - SLPM Value (if output)
54 * bit 23..25 - PDIS value (if input)
58 * to facilitate the definition, the following macros are provided
60 * PIN_CFG_DEFAULT - default config (0):
61 * pull up/down = disabled
62 * sleep mode = input/wakeup
65 * SLPM direction = same as normal
66 * SLPM pull = same as normal
67 * SLPM value = same as normal
69 * PIN_CFG - default config with alternate function
72 typedef unsigned long pin_cfg_t;
74 #define PIN_NUM_MASK 0x1ff
75 #define PIN_NUM(x) ((x) & PIN_NUM_MASK)
77 #define PIN_ALT_SHIFT 9
78 #define PIN_ALT_MASK (0x3 << PIN_ALT_SHIFT)
79 #define PIN_ALT(x) (((x) & PIN_ALT_MASK) >> PIN_ALT_SHIFT)
80 #define PIN_GPIO (NMK_GPIO_ALT_GPIO << PIN_ALT_SHIFT)
81 #define PIN_ALT_A (NMK_GPIO_ALT_A << PIN_ALT_SHIFT)
82 #define PIN_ALT_B (NMK_GPIO_ALT_B << PIN_ALT_SHIFT)
83 #define PIN_ALT_C (NMK_GPIO_ALT_C << PIN_ALT_SHIFT)
85 #define PIN_PULL_SHIFT 11
86 #define PIN_PULL_MASK (0x3 << PIN_PULL_SHIFT)
87 #define PIN_PULL(x) (((x) & PIN_PULL_MASK) >> PIN_PULL_SHIFT)
88 #define PIN_PULL_NONE (NMK_GPIO_PULL_NONE << PIN_PULL_SHIFT)
89 #define PIN_PULL_UP (NMK_GPIO_PULL_UP << PIN_PULL_SHIFT)
90 #define PIN_PULL_DOWN (NMK_GPIO_PULL_DOWN << PIN_PULL_SHIFT)
92 #define PIN_SLPM_SHIFT 13
93 #define PIN_SLPM_MASK (0x1 << PIN_SLPM_SHIFT)
94 #define PIN_SLPM(x) (((x) & PIN_SLPM_MASK) >> PIN_SLPM_SHIFT)
95 #define PIN_SLPM_MAKE_INPUT (NMK_GPIO_SLPM_INPUT << PIN_SLPM_SHIFT)
96 #define PIN_SLPM_NOCHANGE (NMK_GPIO_SLPM_NOCHANGE << PIN_SLPM_SHIFT)
97 /* These two replace the above in DB8500v2+ */
98 #define PIN_SLPM_WAKEUP_ENABLE (NMK_GPIO_SLPM_WAKEUP_ENABLE << PIN_SLPM_SHIFT)
99 #define PIN_SLPM_WAKEUP_DISABLE (NMK_GPIO_SLPM_WAKEUP_DISABLE << PIN_SLPM_SHIFT)
100 #define PIN_SLPM_USE_MUX_SETTINGS_IN_SLEEP PIN_SLPM_WAKEUP_DISABLE
102 #define PIN_SLPM_GPIO PIN_SLPM_WAKEUP_ENABLE /* In SLPM, pin is a gpio */
103 #define PIN_SLPM_ALTFUNC PIN_SLPM_WAKEUP_DISABLE /* In SLPM, pin is altfunc */
105 #define PIN_DIR_SHIFT 14
106 #define PIN_DIR_MASK (0x1 << PIN_DIR_SHIFT)
107 #define PIN_DIR(x) (((x) & PIN_DIR_MASK) >> PIN_DIR_SHIFT)
108 #define PIN_DIR_INPUT (0 << PIN_DIR_SHIFT)
109 #define PIN_DIR_OUTPUT (1 << PIN_DIR_SHIFT)
111 #define PIN_VAL_SHIFT 15
112 #define PIN_VAL_MASK (0x1 << PIN_VAL_SHIFT)
113 #define PIN_VAL(x) (((x) & PIN_VAL_MASK) >> PIN_VAL_SHIFT)
114 #define PIN_VAL_LOW (0 << PIN_VAL_SHIFT)
115 #define PIN_VAL_HIGH (1 << PIN_VAL_SHIFT)
117 #define PIN_SLPM_PULL_SHIFT 16
118 #define PIN_SLPM_PULL_MASK (0x7 << PIN_SLPM_PULL_SHIFT)
119 #define PIN_SLPM_PULL(x) \
120 (((x) & PIN_SLPM_PULL_MASK) >> PIN_SLPM_PULL_SHIFT)
121 #define PIN_SLPM_PULL_NONE \
122 ((1 + NMK_GPIO_PULL_NONE) << PIN_SLPM_PULL_SHIFT)
123 #define PIN_SLPM_PULL_UP \
124 ((1 + NMK_GPIO_PULL_UP) << PIN_SLPM_PULL_SHIFT)
125 #define PIN_SLPM_PULL_DOWN \
126 ((1 + NMK_GPIO_PULL_DOWN) << PIN_SLPM_PULL_SHIFT)
128 #define PIN_SLPM_DIR_SHIFT 19
129 #define PIN_SLPM_DIR_MASK (0x3 << PIN_SLPM_DIR_SHIFT)
130 #define PIN_SLPM_DIR(x) \
131 (((x) & PIN_SLPM_DIR_MASK) >> PIN_SLPM_DIR_SHIFT)
132 #define PIN_SLPM_DIR_INPUT ((1 + 0) << PIN_SLPM_DIR_SHIFT)
133 #define PIN_SLPM_DIR_OUTPUT ((1 + 1) << PIN_SLPM_DIR_SHIFT)
135 #define PIN_SLPM_VAL_SHIFT 21
136 #define PIN_SLPM_VAL_MASK (0x3 << PIN_SLPM_VAL_SHIFT)
137 #define PIN_SLPM_VAL(x) \
138 (((x) & PIN_SLPM_VAL_MASK) >> PIN_SLPM_VAL_SHIFT)
139 #define PIN_SLPM_VAL_LOW ((1 + 0) << PIN_SLPM_VAL_SHIFT)
140 #define PIN_SLPM_VAL_HIGH ((1 + 1) << PIN_SLPM_VAL_SHIFT)
142 #define PIN_SLPM_PDIS_SHIFT 23
143 #define PIN_SLPM_PDIS_MASK (0x3 << PIN_SLPM_PDIS_SHIFT)
144 #define PIN_SLPM_PDIS(x) \
145 (((x) & PIN_SLPM_PDIS_MASK) >> PIN_SLPM_PDIS_SHIFT)
146 #define PIN_SLPM_PDIS_NO_CHANGE (0 << PIN_SLPM_PDIS_SHIFT)
147 #define PIN_SLPM_PDIS_DISABLED (1 << PIN_SLPM_PDIS_SHIFT)
148 #define PIN_SLPM_PDIS_ENABLED (2 << PIN_SLPM_PDIS_SHIFT)
150 #define PIN_LOWEMI_SHIFT 25
151 #define PIN_LOWEMI_MASK (0x1 << PIN_LOWEMI_SHIFT)
152 #define PIN_LOWEMI(x) (((x) & PIN_LOWEMI_MASK) >> PIN_LOWEMI_SHIFT)
153 #define PIN_LOWEMI_DISABLED (0 << PIN_LOWEMI_SHIFT)
154 #define PIN_LOWEMI_ENABLED (1 << PIN_LOWEMI_SHIFT)
156 #define PIN_GPIOMODE_SHIFT 26
157 #define PIN_GPIOMODE_MASK (0x1 << PIN_GPIOMODE_SHIFT)
158 #define PIN_GPIOMODE(x) (((x) & PIN_GPIOMODE_MASK) >> PIN_GPIOMODE_SHIFT)
159 #define PIN_GPIOMODE_DISABLED (0 << PIN_GPIOMODE_SHIFT)
160 #define PIN_GPIOMODE_ENABLED (1 << PIN_GPIOMODE_SHIFT)
162 #define PIN_SLEEPMODE_SHIFT 27
163 #define PIN_SLEEPMODE_MASK (0x1 << PIN_SLEEPMODE_SHIFT)
164 #define PIN_SLEEPMODE(x) (((x) & PIN_SLEEPMODE_MASK) >> PIN_SLEEPMODE_SHIFT)
165 #define PIN_SLEEPMODE_DISABLED (0 << PIN_SLEEPMODE_SHIFT)
166 #define PIN_SLEEPMODE_ENABLED (1 << PIN_SLEEPMODE_SHIFT)
169 /* Shortcuts. Use these instead of separate DIR, PULL, and VAL. */
170 #define PIN_INPUT_PULLDOWN (PIN_DIR_INPUT | PIN_PULL_DOWN)
171 #define PIN_INPUT_PULLUP (PIN_DIR_INPUT | PIN_PULL_UP)
172 #define PIN_INPUT_NOPULL (PIN_DIR_INPUT | PIN_PULL_NONE)
173 #define PIN_OUTPUT_LOW (PIN_DIR_OUTPUT | PIN_VAL_LOW)
174 #define PIN_OUTPUT_HIGH (PIN_DIR_OUTPUT | PIN_VAL_HIGH)
176 #define PIN_SLPM_INPUT_PULLDOWN (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_DOWN)
177 #define PIN_SLPM_INPUT_PULLUP (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_UP)
178 #define PIN_SLPM_INPUT_NOPULL (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_NONE)
179 #define PIN_SLPM_OUTPUT_LOW (PIN_SLPM_DIR_OUTPUT | PIN_SLPM_VAL_LOW)
180 #define PIN_SLPM_OUTPUT_HIGH (PIN_SLPM_DIR_OUTPUT | PIN_SLPM_VAL_HIGH)
182 #define PIN_CFG_DEFAULT (0)
184 #define PIN_CFG(num, alt) \
186 (PIN_NUM(num) | PIN_##alt))
188 #define PIN_CFG_INPUT(num, alt, pull) \
190 (PIN_NUM(num) | PIN_##alt | PIN_INPUT_##pull))
192 #define PIN_CFG_OUTPUT(num, alt, val) \
194 (PIN_NUM(num) | PIN_##alt | PIN_OUTPUT_##val))
197 * "nmk_gpio" and "NMK_GPIO" stand for "Nomadik GPIO", leaving
198 * the "gpio" namespace for generic and cross-machine functions
201 #define GPIO_BLOCK_SHIFT 5
202 #define NMK_GPIO_PER_CHIP (1 << GPIO_BLOCK_SHIFT)
203 #define NMK_MAX_BANKS DIV_ROUND_UP(512, NMK_GPIO_PER_CHIP)
205 /* Register in the logic block */
206 #define NMK_GPIO_DAT 0x00
207 #define NMK_GPIO_DATS 0x04
208 #define NMK_GPIO_DATC 0x08
209 #define NMK_GPIO_PDIS 0x0c
210 #define NMK_GPIO_DIR 0x10
211 #define NMK_GPIO_DIRS 0x14
212 #define NMK_GPIO_DIRC 0x18
213 #define NMK_GPIO_SLPC 0x1c
214 #define NMK_GPIO_AFSLA 0x20
215 #define NMK_GPIO_AFSLB 0x24
216 #define NMK_GPIO_LOWEMI 0x28
218 #define NMK_GPIO_RIMSC 0x40
219 #define NMK_GPIO_FIMSC 0x44
220 #define NMK_GPIO_IS 0x48
221 #define NMK_GPIO_IC 0x4c
222 #define NMK_GPIO_RWIMSC 0x50
223 #define NMK_GPIO_FWIMSC 0x54
224 #define NMK_GPIO_WKS 0x58
225 /* These appear in DB8540 and later ASICs */
226 #define NMK_GPIO_EDGELEVEL 0x5C
227 #define NMK_GPIO_LEVEL 0x60
230 /* Pull up/down values */
240 NMK_GPIO_SLPM_WAKEUP_ENABLE = NMK_GPIO_SLPM_INPUT,
241 NMK_GPIO_SLPM_NOCHANGE,
242 NMK_GPIO_SLPM_WAKEUP_DISABLE = NMK_GPIO_SLPM_NOCHANGE,
245 struct nmk_gpio_chip {
246 struct gpio_chip chip;
247 struct irq_chip irqchip;
251 void (*set_ioforce)(bool enable);
254 /* Keep track of configured edges */
267 * struct nmk_pinctrl - state container for the Nomadik pin controller
268 * @dev: containing device pointer
269 * @pctl: corresponding pin controller device
270 * @soc: SoC data for this specific chip
271 * @prcm_base: PRCM register range virtual base
275 struct pinctrl_dev *pctl;
276 const struct nmk_pinctrl_soc_data *soc;
277 void __iomem *prcm_base;
280 static struct nmk_gpio_chip *nmk_gpio_chips[NMK_MAX_BANKS];
282 static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);
284 #define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips)
286 static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
287 unsigned offset, int gpio_mode)
291 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~BIT(offset);
292 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~BIT(offset);
293 if (gpio_mode & NMK_GPIO_ALT_A)
294 afunc |= BIT(offset);
295 if (gpio_mode & NMK_GPIO_ALT_B)
296 bfunc |= BIT(offset);
297 writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
298 writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
301 static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
302 unsigned offset, enum nmk_gpio_slpm mode)
306 slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
307 if (mode == NMK_GPIO_SLPM_NOCHANGE)
310 slpm &= ~BIT(offset);
311 writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
314 static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
315 unsigned offset, enum nmk_gpio_pull pull)
319 pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
320 if (pull == NMK_GPIO_PULL_NONE) {
322 nmk_chip->pull_up &= ~BIT(offset);
324 pdis &= ~BIT(offset);
327 writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
329 if (pull == NMK_GPIO_PULL_UP) {
330 nmk_chip->pull_up |= BIT(offset);
331 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATS);
332 } else if (pull == NMK_GPIO_PULL_DOWN) {
333 nmk_chip->pull_up &= ~BIT(offset);
334 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATC);
338 static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
339 unsigned offset, bool lowemi)
341 bool enabled = nmk_chip->lowemi & BIT(offset);
343 if (lowemi == enabled)
347 nmk_chip->lowemi |= BIT(offset);
349 nmk_chip->lowemi &= ~BIT(offset);
351 writel_relaxed(nmk_chip->lowemi,
352 nmk_chip->addr + NMK_GPIO_LOWEMI);
355 static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
358 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DIRC);
361 static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip,
362 unsigned offset, int val)
365 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATS);
367 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DATC);
370 static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
371 unsigned offset, int val)
373 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DIRS);
374 __nmk_gpio_set_output(nmk_chip, offset, val);
377 static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
378 unsigned offset, int gpio_mode,
381 u32 rwimsc = nmk_chip->rwimsc;
382 u32 fwimsc = nmk_chip->fwimsc;
384 if (glitch && nmk_chip->set_ioforce) {
385 u32 bit = BIT(offset);
387 /* Prevent spurious wakeups */
388 writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
389 writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);
391 nmk_chip->set_ioforce(true);
394 __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode);
396 if (glitch && nmk_chip->set_ioforce) {
397 nmk_chip->set_ioforce(false);
399 writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC);
400 writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC);
405 nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
407 u32 falling = nmk_chip->fimsc & BIT(offset);
408 u32 rising = nmk_chip->rimsc & BIT(offset);
409 int gpio = nmk_chip->chip.base + offset;
410 int irq = irq_find_mapping(nmk_chip->chip.irq.domain, offset);
411 struct irq_data *d = irq_get_irq_data(irq);
413 if (!rising && !falling)
416 if (!d || !irqd_irq_disabled(d))
420 nmk_chip->rimsc &= ~BIT(offset);
421 writel_relaxed(nmk_chip->rimsc,
422 nmk_chip->addr + NMK_GPIO_RIMSC);
426 nmk_chip->fimsc &= ~BIT(offset);
427 writel_relaxed(nmk_chip->fimsc,
428 nmk_chip->addr + NMK_GPIO_FIMSC);
431 dev_dbg(nmk_chip->chip.parent, "%d: clearing interrupt mask\n", gpio);
434 static void nmk_write_masked(void __iomem *reg, u32 mask, u32 value)
439 val = ((val & ~mask) | (value & mask));
443 static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
444 unsigned offset, unsigned alt_num)
450 const struct prcm_gpiocr_altcx_pin_desc *pin_desc;
451 const u16 *gpiocr_regs;
453 if (!npct->prcm_base)
456 if (alt_num > PRCM_IDX_GPIOCR_ALTC_MAX) {
457 dev_err(npct->dev, "PRCM GPIOCR: alternate-C%i is invalid\n",
462 for (i = 0 ; i < npct->soc->npins_altcx ; i++) {
463 if (npct->soc->altcx_pins[i].pin == offset)
466 if (i == npct->soc->npins_altcx) {
467 dev_dbg(npct->dev, "PRCM GPIOCR: pin %i is not found\n",
472 pin_desc = npct->soc->altcx_pins + i;
473 gpiocr_regs = npct->soc->prcm_gpiocr_registers;
476 * If alt_num is NULL, just clear current ALTCx selection
477 * to make sure we come back to a pure ALTC selection
480 for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) {
481 if (pin_desc->altcx[i].used == true) {
482 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
483 bit = pin_desc->altcx[i].control_bit;
484 if (readl(npct->prcm_base + reg) & BIT(bit)) {
485 nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0);
487 "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
495 alt_index = alt_num - 1;
496 if (pin_desc->altcx[alt_index].used == false) {
498 "PRCM GPIOCR: pin %i: alternate-C%i does not exist\n",
504 * Check if any other ALTCx functions are activated on this pin
505 * and disable it first.
507 for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) {
510 if (pin_desc->altcx[i].used == true) {
511 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
512 bit = pin_desc->altcx[i].control_bit;
513 if (readl(npct->prcm_base + reg) & BIT(bit)) {
514 nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0);
516 "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
522 reg = gpiocr_regs[pin_desc->altcx[alt_index].reg_index];
523 bit = pin_desc->altcx[alt_index].control_bit;
524 dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been selected\n",
525 offset, alt_index+1);
526 nmk_write_masked(npct->prcm_base + reg, BIT(bit), BIT(bit));
530 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
531 * - Save SLPM registers
532 * - Set SLPM=0 for the IOs you want to switch and others to 1
533 * - Configure the GPIO registers for the IOs that are being switched
535 * - Modify the AFLSA/B registers for the IOs that are being switched
537 * - Restore SLPM registers
538 * - Any spurious wake up event during switch sequence to be ignored and
541 static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
545 for (i = 0; i < NUM_BANKS; i++) {
546 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
547 unsigned int temp = slpm[i];
552 clk_enable(chip->clk);
554 slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
555 writel(temp, chip->addr + NMK_GPIO_SLPC);
559 static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
563 for (i = 0; i < NUM_BANKS; i++) {
564 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
569 writel(slpm[i], chip->addr + NMK_GPIO_SLPC);
571 clk_disable(chip->clk);
575 static int __maybe_unused nmk_prcm_gpiocr_get_mode(struct pinctrl_dev *pctldev, int gpio)
580 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
581 const struct prcm_gpiocr_altcx_pin_desc *pin_desc;
582 const u16 *gpiocr_regs;
584 if (!npct->prcm_base)
585 return NMK_GPIO_ALT_C;
587 for (i = 0; i < npct->soc->npins_altcx; i++) {
588 if (npct->soc->altcx_pins[i].pin == gpio)
591 if (i == npct->soc->npins_altcx)
592 return NMK_GPIO_ALT_C;
594 pin_desc = npct->soc->altcx_pins + i;
595 gpiocr_regs = npct->soc->prcm_gpiocr_registers;
596 for (i = 0; i < PRCM_IDX_GPIOCR_ALTC_MAX; i++) {
597 if (pin_desc->altcx[i].used == true) {
598 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
599 bit = pin_desc->altcx[i].control_bit;
600 if (readl(npct->prcm_base + reg) & BIT(bit))
601 return NMK_GPIO_ALT_C+i+1;
604 return NMK_GPIO_ALT_C;
609 static void nmk_gpio_irq_ack(struct irq_data *d)
611 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
612 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
614 clk_enable(nmk_chip->clk);
615 writel(BIT(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
616 clk_disable(nmk_chip->clk);
619 enum nmk_gpio_irq_type {
624 static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
625 int offset, enum nmk_gpio_irq_type which,
633 if (which == NORMAL) {
634 rimscreg = NMK_GPIO_RIMSC;
635 fimscreg = NMK_GPIO_FIMSC;
636 rimscval = &nmk_chip->rimsc;
637 fimscval = &nmk_chip->fimsc;
639 rimscreg = NMK_GPIO_RWIMSC;
640 fimscreg = NMK_GPIO_FWIMSC;
641 rimscval = &nmk_chip->rwimsc;
642 fimscval = &nmk_chip->fwimsc;
645 /* we must individually set/clear the two edges */
646 if (nmk_chip->edge_rising & BIT(offset)) {
648 *rimscval |= BIT(offset);
650 *rimscval &= ~BIT(offset);
651 writel(*rimscval, nmk_chip->addr + rimscreg);
653 if (nmk_chip->edge_falling & BIT(offset)) {
655 *fimscval |= BIT(offset);
657 *fimscval &= ~BIT(offset);
658 writel(*fimscval, nmk_chip->addr + fimscreg);
662 static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
666 * Ensure WAKEUP_ENABLE is on. No need to disable it if wakeup is
667 * disabled, since setting SLPM to 1 increases power consumption, and
668 * wakeup is anyhow controlled by the RIMSC and FIMSC registers.
670 if (nmk_chip->sleepmode && on) {
671 __nmk_gpio_set_slpm(nmk_chip, offset,
672 NMK_GPIO_SLPM_WAKEUP_ENABLE);
675 __nmk_gpio_irq_modify(nmk_chip, offset, WAKE, on);
678 static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
680 struct nmk_gpio_chip *nmk_chip;
683 nmk_chip = irq_data_get_irq_chip_data(d);
687 clk_enable(nmk_chip->clk);
688 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
689 spin_lock(&nmk_chip->lock);
691 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable);
693 if (!(nmk_chip->real_wake & BIT(d->hwirq)))
694 __nmk_gpio_set_wake(nmk_chip, d->hwirq, enable);
696 spin_unlock(&nmk_chip->lock);
697 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
698 clk_disable(nmk_chip->clk);
703 static void nmk_gpio_irq_mask(struct irq_data *d)
705 nmk_gpio_irq_maskunmask(d, false);
708 static void nmk_gpio_irq_unmask(struct irq_data *d)
710 nmk_gpio_irq_maskunmask(d, true);
713 static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
715 struct nmk_gpio_chip *nmk_chip;
718 nmk_chip = irq_data_get_irq_chip_data(d);
722 clk_enable(nmk_chip->clk);
723 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
724 spin_lock(&nmk_chip->lock);
726 if (irqd_irq_disabled(d))
727 __nmk_gpio_set_wake(nmk_chip, d->hwirq, on);
730 nmk_chip->real_wake |= BIT(d->hwirq);
732 nmk_chip->real_wake &= ~BIT(d->hwirq);
734 spin_unlock(&nmk_chip->lock);
735 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
736 clk_disable(nmk_chip->clk);
741 static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
743 bool enabled = !irqd_irq_disabled(d);
744 bool wake = irqd_is_wakeup_set(d);
745 struct nmk_gpio_chip *nmk_chip;
748 nmk_chip = irq_data_get_irq_chip_data(d);
751 if (type & IRQ_TYPE_LEVEL_HIGH)
753 if (type & IRQ_TYPE_LEVEL_LOW)
756 clk_enable(nmk_chip->clk);
757 spin_lock_irqsave(&nmk_chip->lock, flags);
760 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false);
763 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false);
765 nmk_chip->edge_rising &= ~BIT(d->hwirq);
766 if (type & IRQ_TYPE_EDGE_RISING)
767 nmk_chip->edge_rising |= BIT(d->hwirq);
769 nmk_chip->edge_falling &= ~BIT(d->hwirq);
770 if (type & IRQ_TYPE_EDGE_FALLING)
771 nmk_chip->edge_falling |= BIT(d->hwirq);
774 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true);
777 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true);
779 spin_unlock_irqrestore(&nmk_chip->lock, flags);
780 clk_disable(nmk_chip->clk);
785 static unsigned int nmk_gpio_irq_startup(struct irq_data *d)
787 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
789 clk_enable(nmk_chip->clk);
790 nmk_gpio_irq_unmask(d);
794 static void nmk_gpio_irq_shutdown(struct irq_data *d)
796 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
798 nmk_gpio_irq_mask(d);
799 clk_disable(nmk_chip->clk);
802 static void nmk_gpio_irq_handler(struct irq_desc *desc)
804 struct irq_chip *host_chip = irq_desc_get_chip(desc);
805 struct gpio_chip *chip = irq_desc_get_handler_data(desc);
806 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
809 chained_irq_enter(host_chip, desc);
811 clk_enable(nmk_chip->clk);
812 status = readl(nmk_chip->addr + NMK_GPIO_IS);
813 clk_disable(nmk_chip->clk);
816 int bit = __ffs(status);
818 generic_handle_domain_irq(chip->irq.domain, bit);
822 chained_irq_exit(host_chip, desc);
827 static int nmk_gpio_get_dir(struct gpio_chip *chip, unsigned offset)
829 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
832 clk_enable(nmk_chip->clk);
834 dir = readl(nmk_chip->addr + NMK_GPIO_DIR) & BIT(offset);
836 clk_disable(nmk_chip->clk);
839 return GPIO_LINE_DIRECTION_OUT;
841 return GPIO_LINE_DIRECTION_IN;
844 static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
846 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
848 clk_enable(nmk_chip->clk);
850 writel(BIT(offset), nmk_chip->addr + NMK_GPIO_DIRC);
852 clk_disable(nmk_chip->clk);
857 static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
859 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
862 clk_enable(nmk_chip->clk);
864 value = !!(readl(nmk_chip->addr + NMK_GPIO_DAT) & BIT(offset));
866 clk_disable(nmk_chip->clk);
871 static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
874 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
876 clk_enable(nmk_chip->clk);
878 __nmk_gpio_set_output(nmk_chip, offset, val);
880 clk_disable(nmk_chip->clk);
883 static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
886 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
888 clk_enable(nmk_chip->clk);
890 __nmk_gpio_make_output(nmk_chip, offset, val);
892 clk_disable(nmk_chip->clk);
897 #ifdef CONFIG_DEBUG_FS
898 static int nmk_gpio_get_mode(struct nmk_gpio_chip *nmk_chip, int offset)
902 clk_enable(nmk_chip->clk);
904 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & BIT(offset);
905 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & BIT(offset);
907 clk_disable(nmk_chip->clk);
909 return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
912 #include <linux/seq_file.h>
914 static void nmk_gpio_dbg_show_one(struct seq_file *s,
915 struct pinctrl_dev *pctldev, struct gpio_chip *chip,
916 unsigned offset, unsigned gpio)
918 const char *label = gpiochip_is_requested(chip, offset);
919 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
924 const char *modes[] = {
925 [NMK_GPIO_ALT_GPIO] = "gpio",
926 [NMK_GPIO_ALT_A] = "altA",
927 [NMK_GPIO_ALT_B] = "altB",
928 [NMK_GPIO_ALT_C] = "altC",
929 [NMK_GPIO_ALT_C+1] = "altC1",
930 [NMK_GPIO_ALT_C+2] = "altC2",
931 [NMK_GPIO_ALT_C+3] = "altC3",
932 [NMK_GPIO_ALT_C+4] = "altC4",
935 clk_enable(nmk_chip->clk);
936 is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & BIT(offset));
937 pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & BIT(offset));
938 data_out = !!(readl(nmk_chip->addr + NMK_GPIO_DAT) & BIT(offset));
939 mode = nmk_gpio_get_mode(nmk_chip, offset);
940 if ((mode == NMK_GPIO_ALT_C) && pctldev)
941 mode = nmk_prcm_gpiocr_get_mode(pctldev, gpio);
944 seq_printf(s, " gpio-%-3d (%-20.20s) out %s %s",
947 data_out ? "hi" : "lo",
948 (mode < 0) ? "unknown" : modes[mode]);
950 int irq = chip->to_irq(chip, offset);
951 const int pullidx = pull ? 1 : 0;
953 static const char * const pulls[] = {
958 seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s",
962 (mode < 0) ? "unknown" : modes[mode]);
964 val = nmk_gpio_get_input(chip, offset);
965 seq_printf(s, " VAL %d", val);
968 * This races with request_irq(), set_irq_type(),
969 * and set_irq_wake() ... but those are "rare".
971 if (irq > 0 && irq_has_action(irq)) {
975 if (nmk_chip->edge_rising & BIT(offset))
976 trigger = "edge-rising";
977 else if (nmk_chip->edge_falling & BIT(offset))
978 trigger = "edge-falling";
980 trigger = "edge-undefined";
982 wake = !!(nmk_chip->real_wake & BIT(offset));
984 seq_printf(s, " irq-%d %s%s",
985 irq, trigger, wake ? " wakeup" : "");
988 clk_disable(nmk_chip->clk);
991 static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
994 unsigned gpio = chip->base;
996 for (i = 0; i < chip->ngpio; i++, gpio++) {
997 nmk_gpio_dbg_show_one(s, NULL, chip, i, gpio);
1003 static inline void nmk_gpio_dbg_show_one(struct seq_file *s,
1004 struct pinctrl_dev *pctldev,
1005 struct gpio_chip *chip,
1006 unsigned offset, unsigned gpio)
1009 #define nmk_gpio_dbg_show NULL
1013 * We will allocate memory for the state container using devm* allocators
1014 * binding to the first device reaching this point, it doesn't matter if
1015 * it is the pin controller or GPIO driver. However we need to use the right
1016 * platform device when looking up resources so pay attention to pdev.
1018 static struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np,
1019 struct platform_device *pdev)
1021 struct nmk_gpio_chip *nmk_chip;
1022 struct platform_device *gpio_pdev;
1023 struct gpio_chip *chip;
1024 struct resource *res;
1029 gpio_pdev = of_find_device_by_node(np);
1031 pr_err("populate \"%pOFn\": device not found\n", np);
1032 return ERR_PTR(-ENODEV);
1034 if (of_property_read_u32(np, "gpio-bank", &id)) {
1035 dev_err(&pdev->dev, "populate: gpio-bank property not found\n");
1036 platform_device_put(gpio_pdev);
1037 return ERR_PTR(-EINVAL);
1040 /* Already populated? */
1041 nmk_chip = nmk_gpio_chips[id];
1043 platform_device_put(gpio_pdev);
1047 nmk_chip = devm_kzalloc(&pdev->dev, sizeof(*nmk_chip), GFP_KERNEL);
1049 platform_device_put(gpio_pdev);
1050 return ERR_PTR(-ENOMEM);
1053 nmk_chip->bank = id;
1054 chip = &nmk_chip->chip;
1055 chip->base = id * NMK_GPIO_PER_CHIP;
1056 chip->ngpio = NMK_GPIO_PER_CHIP;
1057 chip->label = dev_name(&gpio_pdev->dev);
1058 chip->parent = &gpio_pdev->dev;
1060 res = platform_get_resource(gpio_pdev, IORESOURCE_MEM, 0);
1061 base = devm_ioremap_resource(&pdev->dev, res);
1063 platform_device_put(gpio_pdev);
1064 return ERR_CAST(base);
1066 nmk_chip->addr = base;
1068 clk = clk_get(&gpio_pdev->dev, NULL);
1070 platform_device_put(gpio_pdev);
1071 return (void *) clk;
1074 nmk_chip->clk = clk;
1076 BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
1077 nmk_gpio_chips[id] = nmk_chip;
1081 static int nmk_gpio_probe(struct platform_device *dev)
1083 struct device_node *np = dev->dev.of_node;
1084 struct nmk_gpio_chip *nmk_chip;
1085 struct gpio_chip *chip;
1086 struct gpio_irq_chip *girq;
1087 struct irq_chip *irqchip;
1088 bool supports_sleepmode;
1092 nmk_chip = nmk_gpio_populate_chip(np, dev);
1093 if (IS_ERR(nmk_chip)) {
1094 dev_err(&dev->dev, "could not populate nmk chip struct\n");
1095 return PTR_ERR(nmk_chip);
1098 supports_sleepmode =
1099 of_property_read_bool(np, "st,supports-sleepmode");
1101 /* Correct platform device ID */
1102 dev->id = nmk_chip->bank;
1104 irq = platform_get_irq(dev, 0);
1109 * The virt address in nmk_chip->addr is in the nomadik register space,
1110 * so we can simply convert the resource address, without remapping
1112 nmk_chip->sleepmode = supports_sleepmode;
1113 spin_lock_init(&nmk_chip->lock);
1115 chip = &nmk_chip->chip;
1116 chip->request = gpiochip_generic_request;
1117 chip->free = gpiochip_generic_free;
1118 chip->get_direction = nmk_gpio_get_dir;
1119 chip->direction_input = nmk_gpio_make_input;
1120 chip->get = nmk_gpio_get_input;
1121 chip->direction_output = nmk_gpio_make_output;
1122 chip->set = nmk_gpio_set_output;
1123 chip->dbg_show = nmk_gpio_dbg_show;
1124 chip->can_sleep = false;
1125 chip->owner = THIS_MODULE;
1127 irqchip = &nmk_chip->irqchip;
1128 irqchip->irq_ack = nmk_gpio_irq_ack;
1129 irqchip->irq_mask = nmk_gpio_irq_mask;
1130 irqchip->irq_unmask = nmk_gpio_irq_unmask;
1131 irqchip->irq_set_type = nmk_gpio_irq_set_type;
1132 irqchip->irq_set_wake = nmk_gpio_irq_set_wake;
1133 irqchip->irq_startup = nmk_gpio_irq_startup;
1134 irqchip->irq_shutdown = nmk_gpio_irq_shutdown;
1135 irqchip->flags = IRQCHIP_MASK_ON_SUSPEND;
1136 irqchip->name = kasprintf(GFP_KERNEL, "nmk%u-%u-%u",
1139 chip->base + chip->ngpio - 1);
1142 girq->chip = irqchip;
1143 girq->parent_handler = nmk_gpio_irq_handler;
1144 girq->num_parents = 1;
1145 girq->parents = devm_kcalloc(&dev->dev, 1,
1146 sizeof(*girq->parents),
1150 girq->parents[0] = irq;
1151 girq->default_type = IRQ_TYPE_NONE;
1152 girq->handler = handle_edge_irq;
1154 clk_enable(nmk_chip->clk);
1155 nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
1156 clk_disable(nmk_chip->clk);
1159 ret = gpiochip_add_data(chip, nmk_chip);
1163 platform_set_drvdata(dev, nmk_chip);
1165 dev_info(&dev->dev, "chip registered\n");
1170 static int nmk_get_groups_cnt(struct pinctrl_dev *pctldev)
1172 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1174 return npct->soc->ngroups;
1177 static const char *nmk_get_group_name(struct pinctrl_dev *pctldev,
1180 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1182 return npct->soc->groups[selector].name;
1185 static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
1186 const unsigned **pins,
1189 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1191 *pins = npct->soc->groups[selector].pins;
1192 *num_pins = npct->soc->groups[selector].npins;
1196 static struct nmk_gpio_chip *find_nmk_gpio_from_pin(unsigned pin)
1199 struct nmk_gpio_chip *nmk_gpio;
1201 for(i = 0; i < NMK_MAX_BANKS; i++) {
1202 nmk_gpio = nmk_gpio_chips[i];
1205 if (pin >= nmk_gpio->chip.base &&
1206 pin < nmk_gpio->chip.base + nmk_gpio->chip.ngpio)
1212 static struct gpio_chip *find_gc_from_pin(unsigned pin)
1214 struct nmk_gpio_chip *nmk_gpio = find_nmk_gpio_from_pin(pin);
1217 return &nmk_gpio->chip;
1221 static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
1224 struct gpio_chip *chip = find_gc_from_pin(offset);
1227 seq_printf(s, "invalid pin offset");
1230 nmk_gpio_dbg_show_one(s, pctldev, chip, offset - chip->base, offset);
1233 static int nmk_dt_add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
1234 unsigned *num_maps, const char *group,
1235 const char *function)
1237 if (*num_maps == *reserved_maps)
1240 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
1241 (*map)[*num_maps].data.mux.group = group;
1242 (*map)[*num_maps].data.mux.function = function;
1248 static int nmk_dt_add_map_configs(struct pinctrl_map **map,
1249 unsigned *reserved_maps,
1250 unsigned *num_maps, const char *group,
1251 unsigned long *configs, unsigned num_configs)
1253 unsigned long *dup_configs;
1255 if (*num_maps == *reserved_maps)
1258 dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
1263 (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN;
1265 (*map)[*num_maps].data.configs.group_or_pin = group;
1266 (*map)[*num_maps].data.configs.configs = dup_configs;
1267 (*map)[*num_maps].data.configs.num_configs = num_configs;
1273 #define NMK_CONFIG_PIN(x, y) { .property = x, .config = y, }
1274 #define NMK_CONFIG_PIN_ARRAY(x, y) { .property = x, .choice = y, \
1275 .size = ARRAY_SIZE(y), }
1277 static const unsigned long nmk_pin_input_modes[] = {
1283 static const unsigned long nmk_pin_output_modes[] = {
1289 static const unsigned long nmk_pin_sleep_modes[] = {
1290 PIN_SLEEPMODE_DISABLED,
1291 PIN_SLEEPMODE_ENABLED,
1294 static const unsigned long nmk_pin_sleep_input_modes[] = {
1295 PIN_SLPM_INPUT_NOPULL,
1296 PIN_SLPM_INPUT_PULLUP,
1297 PIN_SLPM_INPUT_PULLDOWN,
1301 static const unsigned long nmk_pin_sleep_output_modes[] = {
1302 PIN_SLPM_OUTPUT_LOW,
1303 PIN_SLPM_OUTPUT_HIGH,
1304 PIN_SLPM_DIR_OUTPUT,
1307 static const unsigned long nmk_pin_sleep_wakeup_modes[] = {
1308 PIN_SLPM_WAKEUP_DISABLE,
1309 PIN_SLPM_WAKEUP_ENABLE,
1312 static const unsigned long nmk_pin_gpio_modes[] = {
1313 PIN_GPIOMODE_DISABLED,
1314 PIN_GPIOMODE_ENABLED,
1317 static const unsigned long nmk_pin_sleep_pdis_modes[] = {
1318 PIN_SLPM_PDIS_DISABLED,
1319 PIN_SLPM_PDIS_ENABLED,
1322 struct nmk_cfg_param {
1323 const char *property;
1324 unsigned long config;
1325 const unsigned long *choice;
1329 static const struct nmk_cfg_param nmk_cfg_params[] = {
1330 NMK_CONFIG_PIN_ARRAY("ste,input", nmk_pin_input_modes),
1331 NMK_CONFIG_PIN_ARRAY("ste,output", nmk_pin_output_modes),
1332 NMK_CONFIG_PIN_ARRAY("ste,sleep", nmk_pin_sleep_modes),
1333 NMK_CONFIG_PIN_ARRAY("ste,sleep-input", nmk_pin_sleep_input_modes),
1334 NMK_CONFIG_PIN_ARRAY("ste,sleep-output", nmk_pin_sleep_output_modes),
1335 NMK_CONFIG_PIN_ARRAY("ste,sleep-wakeup", nmk_pin_sleep_wakeup_modes),
1336 NMK_CONFIG_PIN_ARRAY("ste,gpio", nmk_pin_gpio_modes),
1337 NMK_CONFIG_PIN_ARRAY("ste,sleep-pull-disable", nmk_pin_sleep_pdis_modes),
1340 static int nmk_dt_pin_config(int index, int val, unsigned long *config)
1342 if (nmk_cfg_params[index].choice == NULL)
1343 *config = nmk_cfg_params[index].config;
1345 /* test if out of range */
1346 if (val < nmk_cfg_params[index].size) {
1347 *config = nmk_cfg_params[index].config |
1348 nmk_cfg_params[index].choice[val];
1354 static const char *nmk_find_pin_name(struct pinctrl_dev *pctldev, const char *pin_name)
1357 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1359 if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
1360 for (i = 0; i < npct->soc->npins; i++)
1361 if (npct->soc->pins[i].number == pin_number)
1362 return npct->soc->pins[i].name;
1366 static bool nmk_pinctrl_dt_get_config(struct device_node *np,
1367 unsigned long *configs)
1369 bool has_config = 0;
1370 unsigned long cfg = 0;
1373 for (i = 0; i < ARRAY_SIZE(nmk_cfg_params); i++) {
1374 ret = of_property_read_u32(np,
1375 nmk_cfg_params[i].property, &val);
1376 if (ret != -EINVAL) {
1377 if (nmk_dt_pin_config(i, val, &cfg) == 0) {
1387 static int nmk_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
1388 struct device_node *np,
1389 struct pinctrl_map **map,
1390 unsigned *reserved_maps,
1394 const char *function = NULL;
1395 unsigned long configs = 0;
1396 bool has_config = 0;
1397 struct property *prop;
1398 struct device_node *np_config;
1400 ret = of_property_read_string(np, "function", &function);
1404 ret = of_property_count_strings(np, "groups");
1408 ret = pinctrl_utils_reserve_map(pctldev, map,
1414 of_property_for_each_string(np, "groups", prop, group) {
1415 ret = nmk_dt_add_map_mux(map, reserved_maps, num_maps,
1422 has_config = nmk_pinctrl_dt_get_config(np, &configs);
1423 np_config = of_parse_phandle(np, "ste,config", 0);
1425 has_config |= nmk_pinctrl_dt_get_config(np_config, &configs);
1427 const char *gpio_name;
1430 ret = of_property_count_strings(np, "pins");
1433 ret = pinctrl_utils_reserve_map(pctldev, map,
1439 of_property_for_each_string(np, "pins", prop, pin) {
1440 gpio_name = nmk_find_pin_name(pctldev, pin);
1442 ret = nmk_dt_add_map_configs(map, reserved_maps,
1444 gpio_name, &configs, 1);
1454 static int nmk_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
1455 struct device_node *np_config,
1456 struct pinctrl_map **map, unsigned *num_maps)
1458 unsigned reserved_maps;
1459 struct device_node *np;
1466 for_each_child_of_node(np_config, np) {
1467 ret = nmk_pinctrl_dt_subnode_to_map(pctldev, np, map,
1468 &reserved_maps, num_maps);
1470 pinctrl_utils_free_map(pctldev, *map, *num_maps);
1479 static const struct pinctrl_ops nmk_pinctrl_ops = {
1480 .get_groups_count = nmk_get_groups_cnt,
1481 .get_group_name = nmk_get_group_name,
1482 .get_group_pins = nmk_get_group_pins,
1483 .pin_dbg_show = nmk_pin_dbg_show,
1484 .dt_node_to_map = nmk_pinctrl_dt_node_to_map,
1485 .dt_free_map = pinctrl_utils_free_map,
1488 static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
1490 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1492 return npct->soc->nfunctions;
1495 static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev,
1498 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1500 return npct->soc->functions[function].name;
1503 static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
1505 const char * const **groups,
1506 unsigned * const num_groups)
1508 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1510 *groups = npct->soc->functions[function].groups;
1511 *num_groups = npct->soc->functions[function].ngroups;
1516 static int nmk_pmx_set(struct pinctrl_dev *pctldev, unsigned function,
1519 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1520 const struct nmk_pingroup *g;
1521 static unsigned int slpm[NUM_BANKS];
1522 unsigned long flags = 0;
1527 g = &npct->soc->groups[group];
1529 if (g->altsetting < 0)
1532 dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);
1535 * If we're setting altfunc C by setting both AFSLA and AFSLB to 1,
1536 * we may pass through an undesired state. In this case we take
1539 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
1540 * - Save SLPM registers (since we have a shadow register in the
1541 * nmk_chip we're using that as backup)
1542 * - Set SLPM=0 for the IOs you want to switch and others to 1
1543 * - Configure the GPIO registers for the IOs that are being switched
1545 * - Modify the AFLSA/B registers for the IOs that are being switched
1547 * - Restore SLPM registers
1548 * - Any spurious wake up event during switch sequence to be ignored
1551 * We REALLY need to save ALL slpm registers, because the external
1552 * IOFORCE will switch *all* ports to their sleepmode setting to as
1553 * to avoid glitches. (Not just one port!)
1555 glitch = ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C);
1558 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
1560 /* Initially don't put any pins to sleep when switching */
1561 memset(slpm, 0xff, sizeof(slpm));
1564 * Then mask the pins that need to be sleeping now when we're
1565 * switching to the ALT C function.
1567 for (i = 0; i < g->npins; i++)
1568 slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
1569 nmk_gpio_glitch_slpm_init(slpm);
1572 for (i = 0; i < g->npins; i++) {
1573 struct nmk_gpio_chip *nmk_chip;
1576 nmk_chip = find_nmk_gpio_from_pin(g->pins[i]);
1579 "invalid pin offset %d in group %s at index %d\n",
1580 g->pins[i], g->name, i);
1583 dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);
1585 clk_enable(nmk_chip->clk);
1586 bit = g->pins[i] % NMK_GPIO_PER_CHIP;
1588 * If the pin is switching to altfunc, and there was an
1589 * interrupt installed on it which has been lazy disabled,
1590 * actually mask the interrupt to prevent spurious interrupts
1591 * that would occur while the pin is under control of the
1592 * peripheral. Only SKE does this.
1594 nmk_gpio_disable_lazy_irq(nmk_chip, bit);
1596 __nmk_gpio_set_mode_safe(nmk_chip, bit,
1597 (g->altsetting & NMK_GPIO_ALT_C), glitch);
1598 clk_disable(nmk_chip->clk);
1601 * Call PRCM GPIOCR config function in case ALTC
1602 * has been selected:
1603 * - If selection is a ALTCx, some bits in PRCM GPIOCR registers
1605 * - If selection is pure ALTC and previous selection was ALTCx,
1606 * then some bits in PRCM GPIOCR registers must be cleared.
1608 if ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C)
1609 nmk_prcm_altcx_set_mode(npct, g->pins[i],
1610 g->altsetting >> NMK_GPIO_ALT_CX_SHIFT);
1613 /* When all pins are successfully reconfigured we get here */
1618 nmk_gpio_glitch_slpm_restore(slpm);
1619 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
1625 static int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
1626 struct pinctrl_gpio_range *range,
1629 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1630 struct nmk_gpio_chip *nmk_chip;
1631 struct gpio_chip *chip;
1635 dev_err(npct->dev, "invalid range\n");
1639 dev_err(npct->dev, "missing GPIO chip in range\n");
1643 nmk_chip = gpiochip_get_data(chip);
1645 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
1647 clk_enable(nmk_chip->clk);
1648 bit = offset % NMK_GPIO_PER_CHIP;
1649 /* There is no glitch when converting any pin to GPIO */
1650 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1651 clk_disable(nmk_chip->clk);
1656 static void nmk_gpio_disable_free(struct pinctrl_dev *pctldev,
1657 struct pinctrl_gpio_range *range,
1660 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1662 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
1663 /* Set the pin to some default state, GPIO is usually default */
1666 static const struct pinmux_ops nmk_pinmux_ops = {
1667 .get_functions_count = nmk_pmx_get_funcs_cnt,
1668 .get_function_name = nmk_pmx_get_func_name,
1669 .get_function_groups = nmk_pmx_get_func_groups,
1670 .set_mux = nmk_pmx_set,
1671 .gpio_request_enable = nmk_gpio_request_enable,
1672 .gpio_disable_free = nmk_gpio_disable_free,
1676 static int nmk_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
1677 unsigned long *config)
1679 /* Not implemented */
1683 static int nmk_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
1684 unsigned long *configs, unsigned num_configs)
1686 static const char *pullnames[] = {
1687 [NMK_GPIO_PULL_NONE] = "none",
1688 [NMK_GPIO_PULL_UP] = "up",
1689 [NMK_GPIO_PULL_DOWN] = "down",
1690 [3] /* illegal */ = "??"
1692 static const char *slpmnames[] = {
1693 [NMK_GPIO_SLPM_INPUT] = "input/wakeup",
1694 [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup",
1696 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1697 struct nmk_gpio_chip *nmk_chip;
1700 int pull, slpm, output, val, i;
1701 bool lowemi, gpiomode, sleep;
1703 nmk_chip = find_nmk_gpio_from_pin(pin);
1706 "invalid pin offset %d\n", pin);
1710 for (i = 0; i < num_configs; i++) {
1712 * The pin config contains pin number and altfunction fields,
1713 * here we just ignore that part. It's being handled by the
1714 * framework and pinmux callback respectively.
1716 cfg = (pin_cfg_t) configs[i];
1717 pull = PIN_PULL(cfg);
1718 slpm = PIN_SLPM(cfg);
1719 output = PIN_DIR(cfg);
1721 lowemi = PIN_LOWEMI(cfg);
1722 gpiomode = PIN_GPIOMODE(cfg);
1723 sleep = PIN_SLEEPMODE(cfg);
1726 int slpm_pull = PIN_SLPM_PULL(cfg);
1727 int slpm_output = PIN_SLPM_DIR(cfg);
1728 int slpm_val = PIN_SLPM_VAL(cfg);
1730 /* All pins go into GPIO mode at sleep */
1734 * The SLPM_* values are normal values + 1 to allow zero
1735 * to mean "same as normal".
1738 pull = slpm_pull - 1;
1740 output = slpm_output - 1;
1744 dev_dbg(nmk_chip->chip.parent,
1745 "pin %d: sleep pull %s, dir %s, val %s\n",
1747 slpm_pull ? pullnames[pull] : "same",
1748 slpm_output ? (output ? "output" : "input")
1750 slpm_val ? (val ? "high" : "low") : "same");
1753 dev_dbg(nmk_chip->chip.parent,
1754 "pin %d [%#lx]: pull %s, slpm %s (%s%s), lowemi %s\n",
1755 pin, cfg, pullnames[pull], slpmnames[slpm],
1756 output ? "output " : "input",
1757 output ? (val ? "high" : "low") : "",
1758 lowemi ? "on" : "off");
1760 clk_enable(nmk_chip->clk);
1761 bit = pin % NMK_GPIO_PER_CHIP;
1763 /* No glitch when going to GPIO mode */
1764 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1766 __nmk_gpio_make_output(nmk_chip, bit, val);
1768 __nmk_gpio_make_input(nmk_chip, bit);
1769 __nmk_gpio_set_pull(nmk_chip, bit, pull);
1771 /* TODO: isn't this only applicable on output pins? */
1772 __nmk_gpio_set_lowemi(nmk_chip, bit, lowemi);
1774 __nmk_gpio_set_slpm(nmk_chip, bit, slpm);
1775 clk_disable(nmk_chip->clk);
1776 } /* for each config */
1781 static const struct pinconf_ops nmk_pinconf_ops = {
1782 .pin_config_get = nmk_pin_config_get,
1783 .pin_config_set = nmk_pin_config_set,
1786 static struct pinctrl_desc nmk_pinctrl_desc = {
1787 .name = "pinctrl-nomadik",
1788 .pctlops = &nmk_pinctrl_ops,
1789 .pmxops = &nmk_pinmux_ops,
1790 .confops = &nmk_pinconf_ops,
1791 .owner = THIS_MODULE,
1794 static const struct of_device_id nmk_pinctrl_match[] = {
1796 .compatible = "stericsson,stn8815-pinctrl",
1797 .data = (void *)PINCTRL_NMK_STN8815,
1800 .compatible = "stericsson,db8500-pinctrl",
1801 .data = (void *)PINCTRL_NMK_DB8500,
1804 .compatible = "stericsson,db8540-pinctrl",
1805 .data = (void *)PINCTRL_NMK_DB8540,
1810 #ifdef CONFIG_PM_SLEEP
1811 static int nmk_pinctrl_suspend(struct device *dev)
1813 struct nmk_pinctrl *npct;
1815 npct = dev_get_drvdata(dev);
1819 return pinctrl_force_sleep(npct->pctl);
1822 static int nmk_pinctrl_resume(struct device *dev)
1824 struct nmk_pinctrl *npct;
1826 npct = dev_get_drvdata(dev);
1830 return pinctrl_force_default(npct->pctl);
1834 static int nmk_pinctrl_probe(struct platform_device *pdev)
1836 const struct of_device_id *match;
1837 struct device_node *np = pdev->dev.of_node;
1838 struct device_node *prcm_np;
1839 struct nmk_pinctrl *npct;
1840 unsigned int version = 0;
1843 npct = devm_kzalloc(&pdev->dev, sizeof(*npct), GFP_KERNEL);
1847 match = of_match_device(nmk_pinctrl_match, &pdev->dev);
1850 version = (unsigned int) match->data;
1852 /* Poke in other ASIC variants here */
1853 if (version == PINCTRL_NMK_STN8815)
1854 nmk_pinctrl_stn8815_init(&npct->soc);
1855 if (version == PINCTRL_NMK_DB8500)
1856 nmk_pinctrl_db8500_init(&npct->soc);
1857 if (version == PINCTRL_NMK_DB8540)
1858 nmk_pinctrl_db8540_init(&npct->soc);
1861 * Since we depend on the GPIO chips to provide clock and register base
1862 * for the pin control operations, make sure that we have these
1863 * populated before we continue. Follow the phandles to instantiate
1864 * them. The GPIO portion of the actual hardware may be probed before
1865 * or after this point: it shouldn't matter as the APIs are orthogonal.
1867 for (i = 0; i < NMK_MAX_BANKS; i++) {
1868 struct device_node *gpio_np;
1869 struct nmk_gpio_chip *nmk_chip;
1871 gpio_np = of_parse_phandle(np, "nomadik-gpio-chips", i);
1873 dev_info(&pdev->dev,
1874 "populate NMK GPIO %d \"%pOFn\"\n",
1876 nmk_chip = nmk_gpio_populate_chip(gpio_np, pdev);
1877 if (IS_ERR(nmk_chip))
1879 "could not populate nmk chip struct "
1880 "- continue anyway\n");
1881 of_node_put(gpio_np);
1885 prcm_np = of_parse_phandle(np, "prcm", 0);
1887 npct->prcm_base = of_iomap(prcm_np, 0);
1888 if (!npct->prcm_base) {
1889 if (version == PINCTRL_NMK_STN8815) {
1890 dev_info(&pdev->dev,
1892 "assuming no ALT-Cx control is available\n");
1894 dev_err(&pdev->dev, "missing PRCM base address\n");
1899 nmk_pinctrl_desc.pins = npct->soc->pins;
1900 nmk_pinctrl_desc.npins = npct->soc->npins;
1901 npct->dev = &pdev->dev;
1903 npct->pctl = devm_pinctrl_register(&pdev->dev, &nmk_pinctrl_desc, npct);
1904 if (IS_ERR(npct->pctl)) {
1905 dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n");
1906 return PTR_ERR(npct->pctl);
1909 platform_set_drvdata(pdev, npct);
1910 dev_info(&pdev->dev, "initialized Nomadik pin control driver\n");
1915 static const struct of_device_id nmk_gpio_match[] = {
1916 { .compatible = "st,nomadik-gpio", },
1920 static struct platform_driver nmk_gpio_driver = {
1923 .of_match_table = nmk_gpio_match,
1925 .probe = nmk_gpio_probe,
1928 static SIMPLE_DEV_PM_OPS(nmk_pinctrl_pm_ops,
1929 nmk_pinctrl_suspend,
1930 nmk_pinctrl_resume);
1932 static struct platform_driver nmk_pinctrl_driver = {
1934 .name = "pinctrl-nomadik",
1935 .of_match_table = nmk_pinctrl_match,
1936 .pm = &nmk_pinctrl_pm_ops,
1938 .probe = nmk_pinctrl_probe,
1941 static int __init nmk_gpio_init(void)
1943 return platform_driver_register(&nmk_gpio_driver);
1945 subsys_initcall(nmk_gpio_init);
1947 static int __init nmk_pinctrl_init(void)
1949 return platform_driver_register(&nmk_pinctrl_driver);
1951 core_initcall(nmk_pinctrl_init);