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[deliverable/linux.git] / drivers / pinctrl / pinctrl-nomadik.c
1 /*
2 * Generic GPIO driver for logic cells found in the Nomadik SoC
3 *
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>
8 *
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.
12 */
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>
18 #include <linux/io.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/irqchip/chained_irq.h>
27 #include <linux/slab.h>
28 #include <linux/of_device.h>
29 #include <linux/of_address.h>
30 #include <linux/pinctrl/machine.h>
31 #include <linux/pinctrl/pinctrl.h>
32 #include <linux/pinctrl/pinmux.h>
33 #include <linux/pinctrl/pinconf.h>
34 /* Since we request GPIOs from ourself */
35 #include <linux/pinctrl/consumer.h>
36 #include <linux/platform_data/pinctrl-nomadik.h>
37 #include "pinctrl-nomadik.h"
38 #include "core.h"
39
40 /*
41 * The GPIO module in the Nomadik family of Systems-on-Chip is an
42 * AMBA device, managing 32 pins and alternate functions. The logic block
43 * is currently used in the Nomadik and ux500.
44 *
45 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
46 */
47
48 struct nmk_gpio_chip {
49 struct gpio_chip chip;
50 struct irq_domain *domain;
51 void __iomem *addr;
52 struct clk *clk;
53 unsigned int bank;
54 unsigned int parent_irq;
55 int secondary_parent_irq;
56 u32 (*get_secondary_status)(unsigned int bank);
57 void (*set_ioforce)(bool enable);
58 spinlock_t lock;
59 bool sleepmode;
60 /* Keep track of configured edges */
61 u32 edge_rising;
62 u32 edge_falling;
63 u32 real_wake;
64 u32 rwimsc;
65 u32 fwimsc;
66 u32 rimsc;
67 u32 fimsc;
68 u32 pull_up;
69 u32 lowemi;
70 };
71
72 /**
73 * struct nmk_pinctrl - state container for the Nomadik pin controller
74 * @dev: containing device pointer
75 * @pctl: corresponding pin controller device
76 * @soc: SoC data for this specific chip
77 * @prcm_base: PRCM register range virtual base
78 */
79 struct nmk_pinctrl {
80 struct device *dev;
81 struct pinctrl_dev *pctl;
82 const struct nmk_pinctrl_soc_data *soc;
83 void __iomem *prcm_base;
84 };
85
86 static struct nmk_gpio_chip *
87 nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)];
88
89 static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);
90
91 #define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips)
92
93 static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
94 unsigned offset, int gpio_mode)
95 {
96 u32 bit = 1 << offset;
97 u32 afunc, bfunc;
98
99 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
100 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
101 if (gpio_mode & NMK_GPIO_ALT_A)
102 afunc |= bit;
103 if (gpio_mode & NMK_GPIO_ALT_B)
104 bfunc |= bit;
105 writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
106 writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
107 }
108
109 static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
110 unsigned offset, enum nmk_gpio_slpm mode)
111 {
112 u32 bit = 1 << offset;
113 u32 slpm;
114
115 slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
116 if (mode == NMK_GPIO_SLPM_NOCHANGE)
117 slpm |= bit;
118 else
119 slpm &= ~bit;
120 writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
121 }
122
123 static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
124 unsigned offset, enum nmk_gpio_pull pull)
125 {
126 u32 bit = 1 << offset;
127 u32 pdis;
128
129 pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
130 if (pull == NMK_GPIO_PULL_NONE) {
131 pdis |= bit;
132 nmk_chip->pull_up &= ~bit;
133 } else {
134 pdis &= ~bit;
135 }
136
137 writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
138
139 if (pull == NMK_GPIO_PULL_UP) {
140 nmk_chip->pull_up |= bit;
141 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
142 } else if (pull == NMK_GPIO_PULL_DOWN) {
143 nmk_chip->pull_up &= ~bit;
144 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
145 }
146 }
147
148 static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
149 unsigned offset, bool lowemi)
150 {
151 u32 bit = BIT(offset);
152 bool enabled = nmk_chip->lowemi & bit;
153
154 if (lowemi == enabled)
155 return;
156
157 if (lowemi)
158 nmk_chip->lowemi |= bit;
159 else
160 nmk_chip->lowemi &= ~bit;
161
162 writel_relaxed(nmk_chip->lowemi,
163 nmk_chip->addr + NMK_GPIO_LOWEMI);
164 }
165
166 static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
167 unsigned offset)
168 {
169 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
170 }
171
172 static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip,
173 unsigned offset, int val)
174 {
175 if (val)
176 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS);
177 else
178 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC);
179 }
180
181 static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
182 unsigned offset, int val)
183 {
184 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
185 __nmk_gpio_set_output(nmk_chip, offset, val);
186 }
187
188 static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
189 unsigned offset, int gpio_mode,
190 bool glitch)
191 {
192 u32 rwimsc = nmk_chip->rwimsc;
193 u32 fwimsc = nmk_chip->fwimsc;
194
195 if (glitch && nmk_chip->set_ioforce) {
196 u32 bit = BIT(offset);
197
198 /* Prevent spurious wakeups */
199 writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
200 writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);
201
202 nmk_chip->set_ioforce(true);
203 }
204
205 __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode);
206
207 if (glitch && nmk_chip->set_ioforce) {
208 nmk_chip->set_ioforce(false);
209
210 writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC);
211 writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC);
212 }
213 }
214
215 static void
216 nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
217 {
218 u32 falling = nmk_chip->fimsc & BIT(offset);
219 u32 rising = nmk_chip->rimsc & BIT(offset);
220 int gpio = nmk_chip->chip.base + offset;
221 int irq = irq_find_mapping(nmk_chip->domain, offset);
222 struct irq_data *d = irq_get_irq_data(irq);
223
224 if (!rising && !falling)
225 return;
226
227 if (!d || !irqd_irq_disabled(d))
228 return;
229
230 if (rising) {
231 nmk_chip->rimsc &= ~BIT(offset);
232 writel_relaxed(nmk_chip->rimsc,
233 nmk_chip->addr + NMK_GPIO_RIMSC);
234 }
235
236 if (falling) {
237 nmk_chip->fimsc &= ~BIT(offset);
238 writel_relaxed(nmk_chip->fimsc,
239 nmk_chip->addr + NMK_GPIO_FIMSC);
240 }
241
242 dev_dbg(nmk_chip->chip.dev, "%d: clearing interrupt mask\n", gpio);
243 }
244
245 static void nmk_write_masked(void __iomem *reg, u32 mask, u32 value)
246 {
247 u32 val;
248
249 val = readl(reg);
250 val = ((val & ~mask) | (value & mask));
251 writel(val, reg);
252 }
253
254 static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
255 unsigned offset, unsigned alt_num)
256 {
257 int i;
258 u16 reg;
259 u8 bit;
260 u8 alt_index;
261 const struct prcm_gpiocr_altcx_pin_desc *pin_desc;
262 const u16 *gpiocr_regs;
263
264 if (!npct->prcm_base)
265 return;
266
267 if (alt_num > PRCM_IDX_GPIOCR_ALTC_MAX) {
268 dev_err(npct->dev, "PRCM GPIOCR: alternate-C%i is invalid\n",
269 alt_num);
270 return;
271 }
272
273 for (i = 0 ; i < npct->soc->npins_altcx ; i++) {
274 if (npct->soc->altcx_pins[i].pin == offset)
275 break;
276 }
277 if (i == npct->soc->npins_altcx) {
278 dev_dbg(npct->dev, "PRCM GPIOCR: pin %i is not found\n",
279 offset);
280 return;
281 }
282
283 pin_desc = npct->soc->altcx_pins + i;
284 gpiocr_regs = npct->soc->prcm_gpiocr_registers;
285
286 /*
287 * If alt_num is NULL, just clear current ALTCx selection
288 * to make sure we come back to a pure ALTC selection
289 */
290 if (!alt_num) {
291 for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) {
292 if (pin_desc->altcx[i].used == true) {
293 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
294 bit = pin_desc->altcx[i].control_bit;
295 if (readl(npct->prcm_base + reg) & BIT(bit)) {
296 nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0);
297 dev_dbg(npct->dev,
298 "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
299 offset, i+1);
300 }
301 }
302 }
303 return;
304 }
305
306 alt_index = alt_num - 1;
307 if (pin_desc->altcx[alt_index].used == false) {
308 dev_warn(npct->dev,
309 "PRCM GPIOCR: pin %i: alternate-C%i does not exist\n",
310 offset, alt_num);
311 return;
312 }
313
314 /*
315 * Check if any other ALTCx functions are activated on this pin
316 * and disable it first.
317 */
318 for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) {
319 if (i == alt_index)
320 continue;
321 if (pin_desc->altcx[i].used == true) {
322 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
323 bit = pin_desc->altcx[i].control_bit;
324 if (readl(npct->prcm_base + reg) & BIT(bit)) {
325 nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0);
326 dev_dbg(npct->dev,
327 "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
328 offset, i+1);
329 }
330 }
331 }
332
333 reg = gpiocr_regs[pin_desc->altcx[alt_index].reg_index];
334 bit = pin_desc->altcx[alt_index].control_bit;
335 dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been selected\n",
336 offset, alt_index+1);
337 nmk_write_masked(npct->prcm_base + reg, BIT(bit), BIT(bit));
338 }
339
340 /*
341 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
342 * - Save SLPM registers
343 * - Set SLPM=0 for the IOs you want to switch and others to 1
344 * - Configure the GPIO registers for the IOs that are being switched
345 * - Set IOFORCE=1
346 * - Modify the AFLSA/B registers for the IOs that are being switched
347 * - Set IOFORCE=0
348 * - Restore SLPM registers
349 * - Any spurious wake up event during switch sequence to be ignored and
350 * cleared
351 */
352 static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
353 {
354 int i;
355
356 for (i = 0; i < NUM_BANKS; i++) {
357 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
358 unsigned int temp = slpm[i];
359
360 if (!chip)
361 break;
362
363 clk_enable(chip->clk);
364
365 slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
366 writel(temp, chip->addr + NMK_GPIO_SLPC);
367 }
368 }
369
370 static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
371 {
372 int i;
373
374 for (i = 0; i < NUM_BANKS; i++) {
375 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
376
377 if (!chip)
378 break;
379
380 writel(slpm[i], chip->addr + NMK_GPIO_SLPC);
381
382 clk_disable(chip->clk);
383 }
384 }
385
386 static int __maybe_unused nmk_prcm_gpiocr_get_mode(struct pinctrl_dev *pctldev, int gpio)
387 {
388 int i;
389 u16 reg;
390 u8 bit;
391 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
392 const struct prcm_gpiocr_altcx_pin_desc *pin_desc;
393 const u16 *gpiocr_regs;
394
395 if (!npct->prcm_base)
396 return NMK_GPIO_ALT_C;
397
398 for (i = 0; i < npct->soc->npins_altcx; i++) {
399 if (npct->soc->altcx_pins[i].pin == gpio)
400 break;
401 }
402 if (i == npct->soc->npins_altcx)
403 return NMK_GPIO_ALT_C;
404
405 pin_desc = npct->soc->altcx_pins + i;
406 gpiocr_regs = npct->soc->prcm_gpiocr_registers;
407 for (i = 0; i < PRCM_IDX_GPIOCR_ALTC_MAX; i++) {
408 if (pin_desc->altcx[i].used == true) {
409 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
410 bit = pin_desc->altcx[i].control_bit;
411 if (readl(npct->prcm_base + reg) & BIT(bit))
412 return NMK_GPIO_ALT_C+i+1;
413 }
414 }
415 return NMK_GPIO_ALT_C;
416 }
417
418 int nmk_gpio_get_mode(int gpio)
419 {
420 struct nmk_gpio_chip *nmk_chip;
421 u32 afunc, bfunc, bit;
422
423 nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
424 if (!nmk_chip)
425 return -EINVAL;
426
427 bit = 1 << (gpio % NMK_GPIO_PER_CHIP);
428
429 clk_enable(nmk_chip->clk);
430
431 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
432 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
433
434 clk_disable(nmk_chip->clk);
435
436 return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
437 }
438 EXPORT_SYMBOL(nmk_gpio_get_mode);
439
440
441 /* IRQ functions */
442 static inline int nmk_gpio_get_bitmask(int gpio)
443 {
444 return 1 << (gpio % NMK_GPIO_PER_CHIP);
445 }
446
447 static void nmk_gpio_irq_ack(struct irq_data *d)
448 {
449 struct nmk_gpio_chip *nmk_chip;
450
451 nmk_chip = irq_data_get_irq_chip_data(d);
452 if (!nmk_chip)
453 return;
454
455 clk_enable(nmk_chip->clk);
456 writel(nmk_gpio_get_bitmask(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
457 clk_disable(nmk_chip->clk);
458 }
459
460 enum nmk_gpio_irq_type {
461 NORMAL,
462 WAKE,
463 };
464
465 static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
466 int gpio, enum nmk_gpio_irq_type which,
467 bool enable)
468 {
469 u32 bitmask = nmk_gpio_get_bitmask(gpio);
470 u32 *rimscval;
471 u32 *fimscval;
472 u32 rimscreg;
473 u32 fimscreg;
474
475 if (which == NORMAL) {
476 rimscreg = NMK_GPIO_RIMSC;
477 fimscreg = NMK_GPIO_FIMSC;
478 rimscval = &nmk_chip->rimsc;
479 fimscval = &nmk_chip->fimsc;
480 } else {
481 rimscreg = NMK_GPIO_RWIMSC;
482 fimscreg = NMK_GPIO_FWIMSC;
483 rimscval = &nmk_chip->rwimsc;
484 fimscval = &nmk_chip->fwimsc;
485 }
486
487 /* we must individually set/clear the two edges */
488 if (nmk_chip->edge_rising & bitmask) {
489 if (enable)
490 *rimscval |= bitmask;
491 else
492 *rimscval &= ~bitmask;
493 writel(*rimscval, nmk_chip->addr + rimscreg);
494 }
495 if (nmk_chip->edge_falling & bitmask) {
496 if (enable)
497 *fimscval |= bitmask;
498 else
499 *fimscval &= ~bitmask;
500 writel(*fimscval, nmk_chip->addr + fimscreg);
501 }
502 }
503
504 static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
505 int gpio, bool on)
506 {
507 /*
508 * Ensure WAKEUP_ENABLE is on. No need to disable it if wakeup is
509 * disabled, since setting SLPM to 1 increases power consumption, and
510 * wakeup is anyhow controlled by the RIMSC and FIMSC registers.
511 */
512 if (nmk_chip->sleepmode && on) {
513 __nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP,
514 NMK_GPIO_SLPM_WAKEUP_ENABLE);
515 }
516
517 __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
518 }
519
520 static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
521 {
522 struct nmk_gpio_chip *nmk_chip;
523 unsigned long flags;
524 u32 bitmask;
525
526 nmk_chip = irq_data_get_irq_chip_data(d);
527 bitmask = nmk_gpio_get_bitmask(d->hwirq);
528 if (!nmk_chip)
529 return -EINVAL;
530
531 clk_enable(nmk_chip->clk);
532 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
533 spin_lock(&nmk_chip->lock);
534
535 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable);
536
537 if (!(nmk_chip->real_wake & bitmask))
538 __nmk_gpio_set_wake(nmk_chip, d->hwirq, enable);
539
540 spin_unlock(&nmk_chip->lock);
541 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
542 clk_disable(nmk_chip->clk);
543
544 return 0;
545 }
546
547 static void nmk_gpio_irq_mask(struct irq_data *d)
548 {
549 nmk_gpio_irq_maskunmask(d, false);
550 }
551
552 static void nmk_gpio_irq_unmask(struct irq_data *d)
553 {
554 nmk_gpio_irq_maskunmask(d, true);
555 }
556
557 static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
558 {
559 struct nmk_gpio_chip *nmk_chip;
560 unsigned long flags;
561 u32 bitmask;
562
563 nmk_chip = irq_data_get_irq_chip_data(d);
564 if (!nmk_chip)
565 return -EINVAL;
566 bitmask = nmk_gpio_get_bitmask(d->hwirq);
567
568 clk_enable(nmk_chip->clk);
569 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
570 spin_lock(&nmk_chip->lock);
571
572 if (irqd_irq_disabled(d))
573 __nmk_gpio_set_wake(nmk_chip, d->hwirq, on);
574
575 if (on)
576 nmk_chip->real_wake |= bitmask;
577 else
578 nmk_chip->real_wake &= ~bitmask;
579
580 spin_unlock(&nmk_chip->lock);
581 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
582 clk_disable(nmk_chip->clk);
583
584 return 0;
585 }
586
587 static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
588 {
589 bool enabled = !irqd_irq_disabled(d);
590 bool wake = irqd_is_wakeup_set(d);
591 struct nmk_gpio_chip *nmk_chip;
592 unsigned long flags;
593 u32 bitmask;
594
595 nmk_chip = irq_data_get_irq_chip_data(d);
596 bitmask = nmk_gpio_get_bitmask(d->hwirq);
597 if (!nmk_chip)
598 return -EINVAL;
599 if (type & IRQ_TYPE_LEVEL_HIGH)
600 return -EINVAL;
601 if (type & IRQ_TYPE_LEVEL_LOW)
602 return -EINVAL;
603
604 clk_enable(nmk_chip->clk);
605 spin_lock_irqsave(&nmk_chip->lock, flags);
606
607 if (enabled)
608 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false);
609
610 if (enabled || wake)
611 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false);
612
613 nmk_chip->edge_rising &= ~bitmask;
614 if (type & IRQ_TYPE_EDGE_RISING)
615 nmk_chip->edge_rising |= bitmask;
616
617 nmk_chip->edge_falling &= ~bitmask;
618 if (type & IRQ_TYPE_EDGE_FALLING)
619 nmk_chip->edge_falling |= bitmask;
620
621 if (enabled)
622 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true);
623
624 if (enabled || wake)
625 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true);
626
627 spin_unlock_irqrestore(&nmk_chip->lock, flags);
628 clk_disable(nmk_chip->clk);
629
630 return 0;
631 }
632
633 static unsigned int nmk_gpio_irq_startup(struct irq_data *d)
634 {
635 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
636
637 if (gpio_lock_as_irq(&nmk_chip->chip, d->hwirq))
638 dev_err(nmk_chip->chip.dev,
639 "unable to lock HW IRQ %lu for IRQ\n",
640 d->hwirq);
641 clk_enable(nmk_chip->clk);
642 nmk_gpio_irq_unmask(d);
643 return 0;
644 }
645
646 static void nmk_gpio_irq_shutdown(struct irq_data *d)
647 {
648 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
649
650 nmk_gpio_irq_mask(d);
651 clk_disable(nmk_chip->clk);
652 gpio_unlock_as_irq(&nmk_chip->chip, d->hwirq);
653 }
654
655 static struct irq_chip nmk_gpio_irq_chip = {
656 .name = "Nomadik-GPIO",
657 .irq_ack = nmk_gpio_irq_ack,
658 .irq_mask = nmk_gpio_irq_mask,
659 .irq_unmask = nmk_gpio_irq_unmask,
660 .irq_set_type = nmk_gpio_irq_set_type,
661 .irq_set_wake = nmk_gpio_irq_set_wake,
662 .irq_startup = nmk_gpio_irq_startup,
663 .irq_shutdown = nmk_gpio_irq_shutdown,
664 .flags = IRQCHIP_MASK_ON_SUSPEND,
665 };
666
667 static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
668 u32 status)
669 {
670 struct nmk_gpio_chip *nmk_chip;
671 struct irq_chip *host_chip = irq_get_chip(irq);
672
673 chained_irq_enter(host_chip, desc);
674
675 nmk_chip = irq_get_handler_data(irq);
676 while (status) {
677 int bit = __ffs(status);
678
679 generic_handle_irq(irq_find_mapping(nmk_chip->domain, bit));
680 status &= ~BIT(bit);
681 }
682
683 chained_irq_exit(host_chip, desc);
684 }
685
686 static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
687 {
688 struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
689 u32 status;
690
691 clk_enable(nmk_chip->clk);
692 status = readl(nmk_chip->addr + NMK_GPIO_IS);
693 clk_disable(nmk_chip->clk);
694
695 __nmk_gpio_irq_handler(irq, desc, status);
696 }
697
698 static void nmk_gpio_secondary_irq_handler(unsigned int irq,
699 struct irq_desc *desc)
700 {
701 struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq);
702 u32 status = nmk_chip->get_secondary_status(nmk_chip->bank);
703
704 __nmk_gpio_irq_handler(irq, desc, status);
705 }
706
707 static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
708 {
709 irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
710 irq_set_handler_data(nmk_chip->parent_irq, nmk_chip);
711
712 if (nmk_chip->secondary_parent_irq >= 0) {
713 irq_set_chained_handler(nmk_chip->secondary_parent_irq,
714 nmk_gpio_secondary_irq_handler);
715 irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip);
716 }
717
718 return 0;
719 }
720
721 /* I/O Functions */
722
723 static int nmk_gpio_request(struct gpio_chip *chip, unsigned offset)
724 {
725 /*
726 * Map back to global GPIO space and request muxing, the direction
727 * parameter does not matter for this controller.
728 */
729 int gpio = chip->base + offset;
730
731 return pinctrl_request_gpio(gpio);
732 }
733
734 static void nmk_gpio_free(struct gpio_chip *chip, unsigned offset)
735 {
736 int gpio = chip->base + offset;
737
738 pinctrl_free_gpio(gpio);
739 }
740
741 static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
742 {
743 struct nmk_gpio_chip *nmk_chip =
744 container_of(chip, struct nmk_gpio_chip, chip);
745
746 clk_enable(nmk_chip->clk);
747
748 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
749
750 clk_disable(nmk_chip->clk);
751
752 return 0;
753 }
754
755 static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
756 {
757 struct nmk_gpio_chip *nmk_chip =
758 container_of(chip, struct nmk_gpio_chip, chip);
759 u32 bit = 1 << offset;
760 int value;
761
762 clk_enable(nmk_chip->clk);
763
764 value = (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
765
766 clk_disable(nmk_chip->clk);
767
768 return value;
769 }
770
771 static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
772 int val)
773 {
774 struct nmk_gpio_chip *nmk_chip =
775 container_of(chip, struct nmk_gpio_chip, chip);
776
777 clk_enable(nmk_chip->clk);
778
779 __nmk_gpio_set_output(nmk_chip, offset, val);
780
781 clk_disable(nmk_chip->clk);
782 }
783
784 static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
785 int val)
786 {
787 struct nmk_gpio_chip *nmk_chip =
788 container_of(chip, struct nmk_gpio_chip, chip);
789
790 clk_enable(nmk_chip->clk);
791
792 __nmk_gpio_make_output(nmk_chip, offset, val);
793
794 clk_disable(nmk_chip->clk);
795
796 return 0;
797 }
798
799 static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
800 {
801 struct nmk_gpio_chip *nmk_chip =
802 container_of(chip, struct nmk_gpio_chip, chip);
803
804 return irq_create_mapping(nmk_chip->domain, offset);
805 }
806
807 #ifdef CONFIG_DEBUG_FS
808
809 #include <linux/seq_file.h>
810
811 static void nmk_gpio_dbg_show_one(struct seq_file *s,
812 struct pinctrl_dev *pctldev, struct gpio_chip *chip,
813 unsigned offset, unsigned gpio)
814 {
815 const char *label = gpiochip_is_requested(chip, offset);
816 struct nmk_gpio_chip *nmk_chip =
817 container_of(chip, struct nmk_gpio_chip, chip);
818 int mode;
819 bool is_out;
820 bool pull;
821 u32 bit = 1 << offset;
822 const char *modes[] = {
823 [NMK_GPIO_ALT_GPIO] = "gpio",
824 [NMK_GPIO_ALT_A] = "altA",
825 [NMK_GPIO_ALT_B] = "altB",
826 [NMK_GPIO_ALT_C] = "altC",
827 [NMK_GPIO_ALT_C+1] = "altC1",
828 [NMK_GPIO_ALT_C+2] = "altC2",
829 [NMK_GPIO_ALT_C+3] = "altC3",
830 [NMK_GPIO_ALT_C+4] = "altC4",
831 };
832
833 clk_enable(nmk_chip->clk);
834 is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & bit);
835 pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
836 mode = nmk_gpio_get_mode(gpio);
837 if ((mode == NMK_GPIO_ALT_C) && pctldev)
838 mode = nmk_prcm_gpiocr_get_mode(pctldev, gpio);
839
840 seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
841 gpio, label ?: "(none)",
842 is_out ? "out" : "in ",
843 chip->get
844 ? (chip->get(chip, offset) ? "hi" : "lo")
845 : "? ",
846 (mode < 0) ? "unknown" : modes[mode],
847 pull ? "pull" : "none");
848
849 if (label && !is_out) {
850 int irq = gpio_to_irq(gpio);
851 struct irq_desc *desc = irq_to_desc(irq);
852
853 /* This races with request_irq(), set_irq_type(),
854 * and set_irq_wake() ... but those are "rare".
855 */
856 if (irq >= 0 && desc->action) {
857 char *trigger;
858 u32 bitmask = nmk_gpio_get_bitmask(gpio);
859
860 if (nmk_chip->edge_rising & bitmask)
861 trigger = "edge-rising";
862 else if (nmk_chip->edge_falling & bitmask)
863 trigger = "edge-falling";
864 else
865 trigger = "edge-undefined";
866
867 seq_printf(s, " irq-%d %s%s",
868 irq, trigger,
869 irqd_is_wakeup_set(&desc->irq_data)
870 ? " wakeup" : "");
871 }
872 }
873 clk_disable(nmk_chip->clk);
874 }
875
876 static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
877 {
878 unsigned i;
879 unsigned gpio = chip->base;
880
881 for (i = 0; i < chip->ngpio; i++, gpio++) {
882 nmk_gpio_dbg_show_one(s, NULL, chip, i, gpio);
883 seq_printf(s, "\n");
884 }
885 }
886
887 #else
888 static inline void nmk_gpio_dbg_show_one(struct seq_file *s,
889 struct pinctrl_dev *pctldev,
890 struct gpio_chip *chip,
891 unsigned offset, unsigned gpio)
892 {
893 }
894 #define nmk_gpio_dbg_show NULL
895 #endif
896
897 /* This structure is replicated for each GPIO block allocated at probe time */
898 static struct gpio_chip nmk_gpio_template = {
899 .request = nmk_gpio_request,
900 .free = nmk_gpio_free,
901 .direction_input = nmk_gpio_make_input,
902 .get = nmk_gpio_get_input,
903 .direction_output = nmk_gpio_make_output,
904 .set = nmk_gpio_set_output,
905 .to_irq = nmk_gpio_to_irq,
906 .dbg_show = nmk_gpio_dbg_show,
907 .can_sleep = 0,
908 };
909
910 void nmk_gpio_clocks_enable(void)
911 {
912 int i;
913
914 for (i = 0; i < NUM_BANKS; i++) {
915 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
916
917 if (!chip)
918 continue;
919
920 clk_enable(chip->clk);
921 }
922 }
923
924 void nmk_gpio_clocks_disable(void)
925 {
926 int i;
927
928 for (i = 0; i < NUM_BANKS; i++) {
929 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
930
931 if (!chip)
932 continue;
933
934 clk_disable(chip->clk);
935 }
936 }
937
938 /*
939 * Called from the suspend/resume path to only keep the real wakeup interrupts
940 * (those that have had set_irq_wake() called on them) as wakeup interrupts,
941 * and not the rest of the interrupts which we needed to have as wakeups for
942 * cpuidle.
943 *
944 * PM ops are not used since this needs to be done at the end, after all the
945 * other drivers are done with their suspend callbacks.
946 */
947 void nmk_gpio_wakeups_suspend(void)
948 {
949 int i;
950
951 for (i = 0; i < NUM_BANKS; i++) {
952 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
953
954 if (!chip)
955 break;
956
957 clk_enable(chip->clk);
958
959 writel(chip->rwimsc & chip->real_wake,
960 chip->addr + NMK_GPIO_RWIMSC);
961 writel(chip->fwimsc & chip->real_wake,
962 chip->addr + NMK_GPIO_FWIMSC);
963
964 clk_disable(chip->clk);
965 }
966 }
967
968 void nmk_gpio_wakeups_resume(void)
969 {
970 int i;
971
972 for (i = 0; i < NUM_BANKS; i++) {
973 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
974
975 if (!chip)
976 break;
977
978 clk_enable(chip->clk);
979
980 writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
981 writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);
982
983 clk_disable(chip->clk);
984 }
985 }
986
987 /*
988 * Read the pull up/pull down status.
989 * A bit set in 'pull_up' means that pull up
990 * is selected if pull is enabled in PDIS register.
991 * Note: only pull up/down set via this driver can
992 * be detected due to HW limitations.
993 */
994 void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
995 {
996 if (gpio_bank < NUM_BANKS) {
997 struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank];
998
999 if (!chip)
1000 return;
1001
1002 *pull_up = chip->pull_up;
1003 }
1004 }
1005
1006 static int nmk_gpio_irq_map(struct irq_domain *d, unsigned int irq,
1007 irq_hw_number_t hwirq)
1008 {
1009 struct nmk_gpio_chip *nmk_chip = d->host_data;
1010
1011 if (!nmk_chip)
1012 return -EINVAL;
1013
1014 irq_set_chip_and_handler(irq, &nmk_gpio_irq_chip, handle_edge_irq);
1015 set_irq_flags(irq, IRQF_VALID);
1016 irq_set_chip_data(irq, nmk_chip);
1017 irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);
1018
1019 return 0;
1020 }
1021
1022 static const struct irq_domain_ops nmk_gpio_irq_simple_ops = {
1023 .map = nmk_gpio_irq_map,
1024 .xlate = irq_domain_xlate_twocell,
1025 };
1026
1027 static int nmk_gpio_probe(struct platform_device *dev)
1028 {
1029 struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
1030 struct device_node *np = dev->dev.of_node;
1031 struct nmk_gpio_chip *nmk_chip;
1032 struct gpio_chip *chip;
1033 struct resource *res;
1034 struct clk *clk;
1035 int secondary_irq;
1036 void __iomem *base;
1037 int irq_start = 0;
1038 int irq;
1039 int ret;
1040
1041 if (!pdata && !np) {
1042 dev_err(&dev->dev, "No platform data or device tree found\n");
1043 return -ENODEV;
1044 }
1045
1046 if (np) {
1047 pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
1048 if (!pdata)
1049 return -ENOMEM;
1050
1051 if (of_get_property(np, "st,supports-sleepmode", NULL))
1052 pdata->supports_sleepmode = true;
1053
1054 if (of_property_read_u32(np, "gpio-bank", &dev->id)) {
1055 dev_err(&dev->dev, "gpio-bank property not found\n");
1056 return -EINVAL;
1057 }
1058
1059 pdata->first_gpio = dev->id * NMK_GPIO_PER_CHIP;
1060 pdata->num_gpio = NMK_GPIO_PER_CHIP;
1061 }
1062
1063 irq = platform_get_irq(dev, 0);
1064 if (irq < 0)
1065 return irq;
1066
1067 secondary_irq = platform_get_irq(dev, 1);
1068 if (secondary_irq >= 0 && !pdata->get_secondary_status)
1069 return -EINVAL;
1070
1071 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
1072 base = devm_ioremap_resource(&dev->dev, res);
1073 if (IS_ERR(base))
1074 return PTR_ERR(base);
1075
1076 clk = devm_clk_get(&dev->dev, NULL);
1077 if (IS_ERR(clk))
1078 return PTR_ERR(clk);
1079 clk_prepare(clk);
1080
1081 nmk_chip = devm_kzalloc(&dev->dev, sizeof(*nmk_chip), GFP_KERNEL);
1082 if (!nmk_chip)
1083 return -ENOMEM;
1084
1085 /*
1086 * The virt address in nmk_chip->addr is in the nomadik register space,
1087 * so we can simply convert the resource address, without remapping
1088 */
1089 nmk_chip->bank = dev->id;
1090 nmk_chip->clk = clk;
1091 nmk_chip->addr = base;
1092 nmk_chip->chip = nmk_gpio_template;
1093 nmk_chip->parent_irq = irq;
1094 nmk_chip->secondary_parent_irq = secondary_irq;
1095 nmk_chip->get_secondary_status = pdata->get_secondary_status;
1096 nmk_chip->set_ioforce = pdata->set_ioforce;
1097 nmk_chip->sleepmode = pdata->supports_sleepmode;
1098 spin_lock_init(&nmk_chip->lock);
1099
1100 chip = &nmk_chip->chip;
1101 chip->base = pdata->first_gpio;
1102 chip->ngpio = pdata->num_gpio;
1103 chip->label = pdata->name ?: dev_name(&dev->dev);
1104 chip->dev = &dev->dev;
1105 chip->owner = THIS_MODULE;
1106
1107 clk_enable(nmk_chip->clk);
1108 nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
1109 clk_disable(nmk_chip->clk);
1110
1111 #ifdef CONFIG_OF_GPIO
1112 chip->of_node = np;
1113 #endif
1114
1115 ret = gpiochip_add(&nmk_chip->chip);
1116 if (ret)
1117 return ret;
1118
1119 BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
1120
1121 nmk_gpio_chips[nmk_chip->bank] = nmk_chip;
1122
1123 platform_set_drvdata(dev, nmk_chip);
1124
1125 if (!np)
1126 irq_start = pdata->first_irq;
1127 nmk_chip->domain = irq_domain_add_simple(np,
1128 NMK_GPIO_PER_CHIP, irq_start,
1129 &nmk_gpio_irq_simple_ops, nmk_chip);
1130 if (!nmk_chip->domain) {
1131 dev_err(&dev->dev, "failed to create irqdomain\n");
1132 /* Just do this, no matter if it fails */
1133 ret = gpiochip_remove(&nmk_chip->chip);
1134 return -ENOSYS;
1135 }
1136
1137 nmk_gpio_init_irq(nmk_chip);
1138
1139 dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);
1140
1141 return 0;
1142 }
1143
1144 static int nmk_get_groups_cnt(struct pinctrl_dev *pctldev)
1145 {
1146 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1147
1148 return npct->soc->ngroups;
1149 }
1150
1151 static const char *nmk_get_group_name(struct pinctrl_dev *pctldev,
1152 unsigned selector)
1153 {
1154 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1155
1156 return npct->soc->groups[selector].name;
1157 }
1158
1159 static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
1160 const unsigned **pins,
1161 unsigned *num_pins)
1162 {
1163 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1164
1165 *pins = npct->soc->groups[selector].pins;
1166 *num_pins = npct->soc->groups[selector].npins;
1167 return 0;
1168 }
1169
1170 static struct pinctrl_gpio_range *
1171 nmk_match_gpio_range(struct pinctrl_dev *pctldev, unsigned offset)
1172 {
1173 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1174 int i;
1175
1176 for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
1177 struct pinctrl_gpio_range *range;
1178
1179 range = &npct->soc->gpio_ranges[i];
1180 if (offset >= range->pin_base &&
1181 offset <= (range->pin_base + range->npins - 1))
1182 return range;
1183 }
1184 return NULL;
1185 }
1186
1187 static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
1188 unsigned offset)
1189 {
1190 struct pinctrl_gpio_range *range;
1191 struct gpio_chip *chip;
1192
1193 range = nmk_match_gpio_range(pctldev, offset);
1194 if (!range || !range->gc) {
1195 seq_printf(s, "invalid pin offset");
1196 return;
1197 }
1198 chip = range->gc;
1199 nmk_gpio_dbg_show_one(s, pctldev, chip, offset - chip->base, offset);
1200 }
1201
1202 static void nmk_pinctrl_dt_free_map(struct pinctrl_dev *pctldev,
1203 struct pinctrl_map *map, unsigned num_maps)
1204 {
1205 int i;
1206
1207 for (i = 0; i < num_maps; i++)
1208 if (map[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
1209 kfree(map[i].data.configs.configs);
1210 kfree(map);
1211 }
1212
1213 static int nmk_dt_reserve_map(struct pinctrl_map **map, unsigned *reserved_maps,
1214 unsigned *num_maps, unsigned reserve)
1215 {
1216 unsigned old_num = *reserved_maps;
1217 unsigned new_num = *num_maps + reserve;
1218 struct pinctrl_map *new_map;
1219
1220 if (old_num >= new_num)
1221 return 0;
1222
1223 new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
1224 if (!new_map)
1225 return -ENOMEM;
1226
1227 memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
1228
1229 *map = new_map;
1230 *reserved_maps = new_num;
1231
1232 return 0;
1233 }
1234
1235 static int nmk_dt_add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
1236 unsigned *num_maps, const char *group,
1237 const char *function)
1238 {
1239 if (*num_maps == *reserved_maps)
1240 return -ENOSPC;
1241
1242 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
1243 (*map)[*num_maps].data.mux.group = group;
1244 (*map)[*num_maps].data.mux.function = function;
1245 (*num_maps)++;
1246
1247 return 0;
1248 }
1249
1250 static int nmk_dt_add_map_configs(struct pinctrl_map **map,
1251 unsigned *reserved_maps,
1252 unsigned *num_maps, const char *group,
1253 unsigned long *configs, unsigned num_configs)
1254 {
1255 unsigned long *dup_configs;
1256
1257 if (*num_maps == *reserved_maps)
1258 return -ENOSPC;
1259
1260 dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
1261 GFP_KERNEL);
1262 if (!dup_configs)
1263 return -ENOMEM;
1264
1265 (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN;
1266
1267 (*map)[*num_maps].data.configs.group_or_pin = group;
1268 (*map)[*num_maps].data.configs.configs = dup_configs;
1269 (*map)[*num_maps].data.configs.num_configs = num_configs;
1270 (*num_maps)++;
1271
1272 return 0;
1273 }
1274
1275 #define NMK_CONFIG_PIN(x, y) { .property = x, .config = y, }
1276 #define NMK_CONFIG_PIN_ARRAY(x, y) { .property = x, .choice = y, \
1277 .size = ARRAY_SIZE(y), }
1278
1279 static const unsigned long nmk_pin_input_modes[] = {
1280 PIN_INPUT_NOPULL,
1281 PIN_INPUT_PULLUP,
1282 PIN_INPUT_PULLDOWN,
1283 };
1284
1285 static const unsigned long nmk_pin_output_modes[] = {
1286 PIN_OUTPUT_LOW,
1287 PIN_OUTPUT_HIGH,
1288 PIN_DIR_OUTPUT,
1289 };
1290
1291 static const unsigned long nmk_pin_sleep_modes[] = {
1292 PIN_SLEEPMODE_DISABLED,
1293 PIN_SLEEPMODE_ENABLED,
1294 };
1295
1296 static const unsigned long nmk_pin_sleep_input_modes[] = {
1297 PIN_SLPM_INPUT_NOPULL,
1298 PIN_SLPM_INPUT_PULLUP,
1299 PIN_SLPM_INPUT_PULLDOWN,
1300 PIN_SLPM_DIR_INPUT,
1301 };
1302
1303 static const unsigned long nmk_pin_sleep_output_modes[] = {
1304 PIN_SLPM_OUTPUT_LOW,
1305 PIN_SLPM_OUTPUT_HIGH,
1306 PIN_SLPM_DIR_OUTPUT,
1307 };
1308
1309 static const unsigned long nmk_pin_sleep_wakeup_modes[] = {
1310 PIN_SLPM_WAKEUP_DISABLE,
1311 PIN_SLPM_WAKEUP_ENABLE,
1312 };
1313
1314 static const unsigned long nmk_pin_gpio_modes[] = {
1315 PIN_GPIOMODE_DISABLED,
1316 PIN_GPIOMODE_ENABLED,
1317 };
1318
1319 static const unsigned long nmk_pin_sleep_pdis_modes[] = {
1320 PIN_SLPM_PDIS_DISABLED,
1321 PIN_SLPM_PDIS_ENABLED,
1322 };
1323
1324 struct nmk_cfg_param {
1325 const char *property;
1326 unsigned long config;
1327 const unsigned long *choice;
1328 int size;
1329 };
1330
1331 static const struct nmk_cfg_param nmk_cfg_params[] = {
1332 NMK_CONFIG_PIN_ARRAY("ste,input", nmk_pin_input_modes),
1333 NMK_CONFIG_PIN_ARRAY("ste,output", nmk_pin_output_modes),
1334 NMK_CONFIG_PIN_ARRAY("ste,sleep", nmk_pin_sleep_modes),
1335 NMK_CONFIG_PIN_ARRAY("ste,sleep-input", nmk_pin_sleep_input_modes),
1336 NMK_CONFIG_PIN_ARRAY("ste,sleep-output", nmk_pin_sleep_output_modes),
1337 NMK_CONFIG_PIN_ARRAY("ste,sleep-wakeup", nmk_pin_sleep_wakeup_modes),
1338 NMK_CONFIG_PIN_ARRAY("ste,gpio", nmk_pin_gpio_modes),
1339 NMK_CONFIG_PIN_ARRAY("ste,sleep-pull-disable", nmk_pin_sleep_pdis_modes),
1340 };
1341
1342 static int nmk_dt_pin_config(int index, int val, unsigned long *config)
1343 {
1344 int ret = 0;
1345
1346 if (nmk_cfg_params[index].choice == NULL)
1347 *config = nmk_cfg_params[index].config;
1348 else {
1349 /* test if out of range */
1350 if (val < nmk_cfg_params[index].size) {
1351 *config = nmk_cfg_params[index].config |
1352 nmk_cfg_params[index].choice[val];
1353 }
1354 }
1355 return ret;
1356 }
1357
1358 static const char *nmk_find_pin_name(struct pinctrl_dev *pctldev, const char *pin_name)
1359 {
1360 int i, pin_number;
1361 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1362
1363 if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
1364 for (i = 0; i < npct->soc->npins; i++)
1365 if (npct->soc->pins[i].number == pin_number)
1366 return npct->soc->pins[i].name;
1367 return NULL;
1368 }
1369
1370 static bool nmk_pinctrl_dt_get_config(struct device_node *np,
1371 unsigned long *configs)
1372 {
1373 bool has_config = 0;
1374 unsigned long cfg = 0;
1375 int i, val, ret;
1376
1377 for (i = 0; i < ARRAY_SIZE(nmk_cfg_params); i++) {
1378 ret = of_property_read_u32(np,
1379 nmk_cfg_params[i].property, &val);
1380 if (ret != -EINVAL) {
1381 if (nmk_dt_pin_config(i, val, &cfg) == 0) {
1382 *configs |= cfg;
1383 has_config = 1;
1384 }
1385 }
1386 }
1387
1388 return has_config;
1389 }
1390
1391 static int nmk_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
1392 struct device_node *np,
1393 struct pinctrl_map **map,
1394 unsigned *reserved_maps,
1395 unsigned *num_maps)
1396 {
1397 int ret;
1398 const char *function = NULL;
1399 unsigned long configs = 0;
1400 bool has_config = 0;
1401 unsigned reserve = 0;
1402 struct property *prop;
1403 const char *group, *gpio_name;
1404 struct device_node *np_config;
1405
1406 ret = of_property_read_string(np, "ste,function", &function);
1407 if (ret >= 0)
1408 reserve = 1;
1409
1410 has_config = nmk_pinctrl_dt_get_config(np, &configs);
1411
1412 np_config = of_parse_phandle(np, "ste,config", 0);
1413 if (np_config)
1414 has_config |= nmk_pinctrl_dt_get_config(np_config, &configs);
1415
1416 ret = of_property_count_strings(np, "ste,pins");
1417 if (ret < 0)
1418 goto exit;
1419
1420 if (has_config)
1421 reserve++;
1422
1423 reserve *= ret;
1424
1425 ret = nmk_dt_reserve_map(map, reserved_maps, num_maps, reserve);
1426 if (ret < 0)
1427 goto exit;
1428
1429 of_property_for_each_string(np, "ste,pins", prop, group) {
1430 if (function) {
1431 ret = nmk_dt_add_map_mux(map, reserved_maps, num_maps,
1432 group, function);
1433 if (ret < 0)
1434 goto exit;
1435 }
1436 if (has_config) {
1437 gpio_name = nmk_find_pin_name(pctldev, group);
1438
1439 ret = nmk_dt_add_map_configs(map, reserved_maps, num_maps,
1440 gpio_name, &configs, 1);
1441 if (ret < 0)
1442 goto exit;
1443 }
1444
1445 }
1446 exit:
1447 return ret;
1448 }
1449
1450 static int nmk_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
1451 struct device_node *np_config,
1452 struct pinctrl_map **map, unsigned *num_maps)
1453 {
1454 unsigned reserved_maps;
1455 struct device_node *np;
1456 int ret;
1457
1458 reserved_maps = 0;
1459 *map = NULL;
1460 *num_maps = 0;
1461
1462 for_each_child_of_node(np_config, np) {
1463 ret = nmk_pinctrl_dt_subnode_to_map(pctldev, np, map,
1464 &reserved_maps, num_maps);
1465 if (ret < 0) {
1466 nmk_pinctrl_dt_free_map(pctldev, *map, *num_maps);
1467 return ret;
1468 }
1469 }
1470
1471 return 0;
1472 }
1473
1474 static const struct pinctrl_ops nmk_pinctrl_ops = {
1475 .get_groups_count = nmk_get_groups_cnt,
1476 .get_group_name = nmk_get_group_name,
1477 .get_group_pins = nmk_get_group_pins,
1478 .pin_dbg_show = nmk_pin_dbg_show,
1479 .dt_node_to_map = nmk_pinctrl_dt_node_to_map,
1480 .dt_free_map = nmk_pinctrl_dt_free_map,
1481 };
1482
1483 static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
1484 {
1485 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1486
1487 return npct->soc->nfunctions;
1488 }
1489
1490 static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev,
1491 unsigned function)
1492 {
1493 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1494
1495 return npct->soc->functions[function].name;
1496 }
1497
1498 static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
1499 unsigned function,
1500 const char * const **groups,
1501 unsigned * const num_groups)
1502 {
1503 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1504
1505 *groups = npct->soc->functions[function].groups;
1506 *num_groups = npct->soc->functions[function].ngroups;
1507
1508 return 0;
1509 }
1510
1511 static int nmk_pmx_enable(struct pinctrl_dev *pctldev, unsigned function,
1512 unsigned group)
1513 {
1514 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1515 const struct nmk_pingroup *g;
1516 static unsigned int slpm[NUM_BANKS];
1517 unsigned long flags = 0;
1518 bool glitch;
1519 int ret = -EINVAL;
1520 int i;
1521
1522 g = &npct->soc->groups[group];
1523
1524 if (g->altsetting < 0)
1525 return -EINVAL;
1526
1527 dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);
1528
1529 /*
1530 * If we're setting altfunc C by setting both AFSLA and AFSLB to 1,
1531 * we may pass through an undesired state. In this case we take
1532 * some extra care.
1533 *
1534 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
1535 * - Save SLPM registers (since we have a shadow register in the
1536 * nmk_chip we're using that as backup)
1537 * - Set SLPM=0 for the IOs you want to switch and others to 1
1538 * - Configure the GPIO registers for the IOs that are being switched
1539 * - Set IOFORCE=1
1540 * - Modify the AFLSA/B registers for the IOs that are being switched
1541 * - Set IOFORCE=0
1542 * - Restore SLPM registers
1543 * - Any spurious wake up event during switch sequence to be ignored
1544 * and cleared
1545 *
1546 * We REALLY need to save ALL slpm registers, because the external
1547 * IOFORCE will switch *all* ports to their sleepmode setting to as
1548 * to avoid glitches. (Not just one port!)
1549 */
1550 glitch = ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C);
1551
1552 if (glitch) {
1553 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
1554
1555 /* Initially don't put any pins to sleep when switching */
1556 memset(slpm, 0xff, sizeof(slpm));
1557
1558 /*
1559 * Then mask the pins that need to be sleeping now when we're
1560 * switching to the ALT C function.
1561 */
1562 for (i = 0; i < g->npins; i++)
1563 slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
1564 nmk_gpio_glitch_slpm_init(slpm);
1565 }
1566
1567 for (i = 0; i < g->npins; i++) {
1568 struct pinctrl_gpio_range *range;
1569 struct nmk_gpio_chip *nmk_chip;
1570 struct gpio_chip *chip;
1571 unsigned bit;
1572
1573 range = nmk_match_gpio_range(pctldev, g->pins[i]);
1574 if (!range) {
1575 dev_err(npct->dev,
1576 "invalid pin offset %d in group %s at index %d\n",
1577 g->pins[i], g->name, i);
1578 goto out_glitch;
1579 }
1580 if (!range->gc) {
1581 dev_err(npct->dev, "GPIO chip missing in range for pin offset %d in group %s at index %d\n",
1582 g->pins[i], g->name, i);
1583 goto out_glitch;
1584 }
1585 chip = range->gc;
1586 nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
1587 dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);
1588
1589 clk_enable(nmk_chip->clk);
1590 bit = g->pins[i] % NMK_GPIO_PER_CHIP;
1591 /*
1592 * If the pin is switching to altfunc, and there was an
1593 * interrupt installed on it which has been lazy disabled,
1594 * actually mask the interrupt to prevent spurious interrupts
1595 * that would occur while the pin is under control of the
1596 * peripheral. Only SKE does this.
1597 */
1598 nmk_gpio_disable_lazy_irq(nmk_chip, bit);
1599
1600 __nmk_gpio_set_mode_safe(nmk_chip, bit,
1601 (g->altsetting & NMK_GPIO_ALT_C), glitch);
1602 clk_disable(nmk_chip->clk);
1603
1604 /*
1605 * Call PRCM GPIOCR config function in case ALTC
1606 * has been selected:
1607 * - If selection is a ALTCx, some bits in PRCM GPIOCR registers
1608 * must be set.
1609 * - If selection is pure ALTC and previous selection was ALTCx,
1610 * then some bits in PRCM GPIOCR registers must be cleared.
1611 */
1612 if ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C)
1613 nmk_prcm_altcx_set_mode(npct, g->pins[i],
1614 g->altsetting >> NMK_GPIO_ALT_CX_SHIFT);
1615 }
1616
1617 /* When all pins are successfully reconfigured we get here */
1618 ret = 0;
1619
1620 out_glitch:
1621 if (glitch) {
1622 nmk_gpio_glitch_slpm_restore(slpm);
1623 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
1624 }
1625
1626 return ret;
1627 }
1628
1629 static void nmk_pmx_disable(struct pinctrl_dev *pctldev,
1630 unsigned function, unsigned group)
1631 {
1632 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1633 const struct nmk_pingroup *g;
1634
1635 g = &npct->soc->groups[group];
1636
1637 if (g->altsetting < 0)
1638 return;
1639
1640 /* Poke out the mux, set the pin to some default state? */
1641 dev_dbg(npct->dev, "disable group %s, %u pins\n", g->name, g->npins);
1642 }
1643
1644 static int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
1645 struct pinctrl_gpio_range *range,
1646 unsigned offset)
1647 {
1648 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1649 struct nmk_gpio_chip *nmk_chip;
1650 struct gpio_chip *chip;
1651 unsigned bit;
1652
1653 if (!range) {
1654 dev_err(npct->dev, "invalid range\n");
1655 return -EINVAL;
1656 }
1657 if (!range->gc) {
1658 dev_err(npct->dev, "missing GPIO chip in range\n");
1659 return -EINVAL;
1660 }
1661 chip = range->gc;
1662 nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
1663
1664 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
1665
1666 clk_enable(nmk_chip->clk);
1667 bit = offset % NMK_GPIO_PER_CHIP;
1668 /* There is no glitch when converting any pin to GPIO */
1669 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1670 clk_disable(nmk_chip->clk);
1671
1672 return 0;
1673 }
1674
1675 static void nmk_gpio_disable_free(struct pinctrl_dev *pctldev,
1676 struct pinctrl_gpio_range *range,
1677 unsigned offset)
1678 {
1679 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1680
1681 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
1682 /* Set the pin to some default state, GPIO is usually default */
1683 }
1684
1685 static const struct pinmux_ops nmk_pinmux_ops = {
1686 .get_functions_count = nmk_pmx_get_funcs_cnt,
1687 .get_function_name = nmk_pmx_get_func_name,
1688 .get_function_groups = nmk_pmx_get_func_groups,
1689 .enable = nmk_pmx_enable,
1690 .disable = nmk_pmx_disable,
1691 .gpio_request_enable = nmk_gpio_request_enable,
1692 .gpio_disable_free = nmk_gpio_disable_free,
1693 };
1694
1695 static int nmk_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
1696 unsigned long *config)
1697 {
1698 /* Not implemented */
1699 return -EINVAL;
1700 }
1701
1702 static int nmk_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
1703 unsigned long *configs, unsigned num_configs)
1704 {
1705 static const char *pullnames[] = {
1706 [NMK_GPIO_PULL_NONE] = "none",
1707 [NMK_GPIO_PULL_UP] = "up",
1708 [NMK_GPIO_PULL_DOWN] = "down",
1709 [3] /* illegal */ = "??"
1710 };
1711 static const char *slpmnames[] = {
1712 [NMK_GPIO_SLPM_INPUT] = "input/wakeup",
1713 [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup",
1714 };
1715 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1716 struct nmk_gpio_chip *nmk_chip;
1717 struct pinctrl_gpio_range *range;
1718 struct gpio_chip *chip;
1719 unsigned bit;
1720 pin_cfg_t cfg;
1721 int pull, slpm, output, val, i;
1722 bool lowemi, gpiomode, sleep;
1723
1724 range = nmk_match_gpio_range(pctldev, pin);
1725 if (!range) {
1726 dev_err(npct->dev, "invalid pin offset %d\n", pin);
1727 return -EINVAL;
1728 }
1729 if (!range->gc) {
1730 dev_err(npct->dev, "GPIO chip missing in range for pin %d\n",
1731 pin);
1732 return -EINVAL;
1733 }
1734 chip = range->gc;
1735 nmk_chip = container_of(chip, struct nmk_gpio_chip, chip);
1736
1737 for (i = 0; i < num_configs; i++) {
1738 /*
1739 * The pin config contains pin number and altfunction fields,
1740 * here we just ignore that part. It's being handled by the
1741 * framework and pinmux callback respectively.
1742 */
1743 cfg = (pin_cfg_t) configs[i];
1744 pull = PIN_PULL(cfg);
1745 slpm = PIN_SLPM(cfg);
1746 output = PIN_DIR(cfg);
1747 val = PIN_VAL(cfg);
1748 lowemi = PIN_LOWEMI(cfg);
1749 gpiomode = PIN_GPIOMODE(cfg);
1750 sleep = PIN_SLEEPMODE(cfg);
1751
1752 if (sleep) {
1753 int slpm_pull = PIN_SLPM_PULL(cfg);
1754 int slpm_output = PIN_SLPM_DIR(cfg);
1755 int slpm_val = PIN_SLPM_VAL(cfg);
1756
1757 /* All pins go into GPIO mode at sleep */
1758 gpiomode = true;
1759
1760 /*
1761 * The SLPM_* values are normal values + 1 to allow zero
1762 * to mean "same as normal".
1763 */
1764 if (slpm_pull)
1765 pull = slpm_pull - 1;
1766 if (slpm_output)
1767 output = slpm_output - 1;
1768 if (slpm_val)
1769 val = slpm_val - 1;
1770
1771 dev_dbg(nmk_chip->chip.dev,
1772 "pin %d: sleep pull %s, dir %s, val %s\n",
1773 pin,
1774 slpm_pull ? pullnames[pull] : "same",
1775 slpm_output ? (output ? "output" : "input")
1776 : "same",
1777 slpm_val ? (val ? "high" : "low") : "same");
1778 }
1779
1780 dev_dbg(nmk_chip->chip.dev,
1781 "pin %d [%#lx]: pull %s, slpm %s (%s%s), lowemi %s\n",
1782 pin, cfg, pullnames[pull], slpmnames[slpm],
1783 output ? "output " : "input",
1784 output ? (val ? "high" : "low") : "",
1785 lowemi ? "on" : "off");
1786
1787 clk_enable(nmk_chip->clk);
1788 bit = pin % NMK_GPIO_PER_CHIP;
1789 if (gpiomode)
1790 /* No glitch when going to GPIO mode */
1791 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1792 if (output)
1793 __nmk_gpio_make_output(nmk_chip, bit, val);
1794 else {
1795 __nmk_gpio_make_input(nmk_chip, bit);
1796 __nmk_gpio_set_pull(nmk_chip, bit, pull);
1797 }
1798 /* TODO: isn't this only applicable on output pins? */
1799 __nmk_gpio_set_lowemi(nmk_chip, bit, lowemi);
1800
1801 __nmk_gpio_set_slpm(nmk_chip, bit, slpm);
1802 clk_disable(nmk_chip->clk);
1803 } /* for each config */
1804
1805 return 0;
1806 }
1807
1808 static const struct pinconf_ops nmk_pinconf_ops = {
1809 .pin_config_get = nmk_pin_config_get,
1810 .pin_config_set = nmk_pin_config_set,
1811 };
1812
1813 static struct pinctrl_desc nmk_pinctrl_desc = {
1814 .name = "pinctrl-nomadik",
1815 .pctlops = &nmk_pinctrl_ops,
1816 .pmxops = &nmk_pinmux_ops,
1817 .confops = &nmk_pinconf_ops,
1818 .owner = THIS_MODULE,
1819 };
1820
1821 static const struct of_device_id nmk_pinctrl_match[] = {
1822 {
1823 .compatible = "stericsson,stn8815-pinctrl",
1824 .data = (void *)PINCTRL_NMK_STN8815,
1825 },
1826 {
1827 .compatible = "stericsson,db8500-pinctrl",
1828 .data = (void *)PINCTRL_NMK_DB8500,
1829 },
1830 {
1831 .compatible = "stericsson,db8540-pinctrl",
1832 .data = (void *)PINCTRL_NMK_DB8540,
1833 },
1834 {},
1835 };
1836
1837 static int nmk_pinctrl_suspend(struct platform_device *pdev, pm_message_t state)
1838 {
1839 struct nmk_pinctrl *npct;
1840
1841 npct = platform_get_drvdata(pdev);
1842 if (!npct)
1843 return -EINVAL;
1844
1845 return pinctrl_force_sleep(npct->pctl);
1846 }
1847
1848 static int nmk_pinctrl_resume(struct platform_device *pdev)
1849 {
1850 struct nmk_pinctrl *npct;
1851
1852 npct = platform_get_drvdata(pdev);
1853 if (!npct)
1854 return -EINVAL;
1855
1856 return pinctrl_force_default(npct->pctl);
1857 }
1858
1859 static int nmk_pinctrl_probe(struct platform_device *pdev)
1860 {
1861 const struct platform_device_id *platid = platform_get_device_id(pdev);
1862 struct device_node *np = pdev->dev.of_node;
1863 struct device_node *prcm_np;
1864 struct nmk_pinctrl *npct;
1865 struct resource *res;
1866 unsigned int version = 0;
1867 int i;
1868
1869 npct = devm_kzalloc(&pdev->dev, sizeof(*npct), GFP_KERNEL);
1870 if (!npct)
1871 return -ENOMEM;
1872
1873 if (platid)
1874 version = platid->driver_data;
1875 else if (np) {
1876 const struct of_device_id *match;
1877
1878 match = of_match_device(nmk_pinctrl_match, &pdev->dev);
1879 if (!match)
1880 return -ENODEV;
1881 version = (unsigned int) match->data;
1882 }
1883
1884 /* Poke in other ASIC variants here */
1885 if (version == PINCTRL_NMK_STN8815)
1886 nmk_pinctrl_stn8815_init(&npct->soc);
1887 if (version == PINCTRL_NMK_DB8500)
1888 nmk_pinctrl_db8500_init(&npct->soc);
1889 if (version == PINCTRL_NMK_DB8540)
1890 nmk_pinctrl_db8540_init(&npct->soc);
1891
1892 if (np) {
1893 prcm_np = of_parse_phandle(np, "prcm", 0);
1894 if (prcm_np)
1895 npct->prcm_base = of_iomap(prcm_np, 0);
1896 }
1897
1898 /* Allow platform passed information to over-write DT. */
1899 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1900 if (res)
1901 npct->prcm_base = devm_ioremap(&pdev->dev, res->start,
1902 resource_size(res));
1903 if (!npct->prcm_base) {
1904 if (version == PINCTRL_NMK_STN8815) {
1905 dev_info(&pdev->dev,
1906 "No PRCM base, "
1907 "assuming no ALT-Cx control is available\n");
1908 } else {
1909 dev_err(&pdev->dev, "missing PRCM base address\n");
1910 return -EINVAL;
1911 }
1912 }
1913
1914 /*
1915 * We need all the GPIO drivers to probe FIRST, or we will not be able
1916 * to obtain references to the struct gpio_chip * for them, and we
1917 * need this to proceed.
1918 */
1919 for (i = 0; i < npct->soc->gpio_num_ranges; i++) {
1920 if (!nmk_gpio_chips[npct->soc->gpio_ranges[i].id]) {
1921 dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
1922 return -EPROBE_DEFER;
1923 }
1924 npct->soc->gpio_ranges[i].gc = &nmk_gpio_chips[npct->soc->gpio_ranges[i].id]->chip;
1925 }
1926
1927 nmk_pinctrl_desc.pins = npct->soc->pins;
1928 nmk_pinctrl_desc.npins = npct->soc->npins;
1929 npct->dev = &pdev->dev;
1930
1931 npct->pctl = pinctrl_register(&nmk_pinctrl_desc, &pdev->dev, npct);
1932 if (!npct->pctl) {
1933 dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n");
1934 return -EINVAL;
1935 }
1936
1937 /* We will handle a range of GPIO pins */
1938 for (i = 0; i < npct->soc->gpio_num_ranges; i++)
1939 pinctrl_add_gpio_range(npct->pctl, &npct->soc->gpio_ranges[i]);
1940
1941 platform_set_drvdata(pdev, npct);
1942 dev_info(&pdev->dev, "initialized Nomadik pin control driver\n");
1943
1944 return 0;
1945 }
1946
1947 static const struct of_device_id nmk_gpio_match[] = {
1948 { .compatible = "st,nomadik-gpio", },
1949 {}
1950 };
1951
1952 static struct platform_driver nmk_gpio_driver = {
1953 .driver = {
1954 .owner = THIS_MODULE,
1955 .name = "gpio",
1956 .of_match_table = nmk_gpio_match,
1957 },
1958 .probe = nmk_gpio_probe,
1959 };
1960
1961 static const struct platform_device_id nmk_pinctrl_id[] = {
1962 { "pinctrl-stn8815", PINCTRL_NMK_STN8815 },
1963 { "pinctrl-db8500", PINCTRL_NMK_DB8500 },
1964 { "pinctrl-db8540", PINCTRL_NMK_DB8540 },
1965 { }
1966 };
1967
1968 static struct platform_driver nmk_pinctrl_driver = {
1969 .driver = {
1970 .owner = THIS_MODULE,
1971 .name = "pinctrl-nomadik",
1972 .of_match_table = nmk_pinctrl_match,
1973 },
1974 .probe = nmk_pinctrl_probe,
1975 .id_table = nmk_pinctrl_id,
1976 #ifdef CONFIG_PM
1977 .suspend = nmk_pinctrl_suspend,
1978 .resume = nmk_pinctrl_resume,
1979 #endif
1980 };
1981
1982 static int __init nmk_gpio_init(void)
1983 {
1984 int ret;
1985
1986 ret = platform_driver_register(&nmk_gpio_driver);
1987 if (ret)
1988 return ret;
1989 return platform_driver_register(&nmk_pinctrl_driver);
1990 }
1991
1992 core_initcall(nmk_gpio_init);
1993
1994 MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
1995 MODULE_DESCRIPTION("Nomadik GPIO Driver");
1996 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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