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Merge tag 'asoc-v4.7' into asoc-linus
[deliverable/linux.git] / drivers / pinctrl / nomadik / 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) 2011-2013 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/slab.h>
25 #include <linux/of_device.h>
26 #include <linux/of_address.h>
27 #include <linux/pinctrl/machine.h>
28 #include <linux/pinctrl/pinctrl.h>
29 #include <linux/pinctrl/pinmux.h>
30 #include <linux/pinctrl/pinconf.h>
31 /* Since we request GPIOs from ourself */
32 #include <linux/pinctrl/consumer.h>
33 #include "pinctrl-nomadik.h"
34 #include "../core.h"
35 #include "../pinctrl-utils.h"
36
37 /*
38 * The GPIO module in the Nomadik family of Systems-on-Chip is an
39 * AMBA device, managing 32 pins and alternate functions. The logic block
40 * is currently used in the Nomadik and ux500.
41 *
42 * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
43 */
44
45 /*
46 * pin configurations are represented by 32-bit integers:
47 *
48 * bit 0.. 8 - Pin Number (512 Pins Maximum)
49 * bit 9..10 - Alternate Function Selection
50 * bit 11..12 - Pull up/down state
51 * bit 13 - Sleep mode behaviour
52 * bit 14 - Direction
53 * bit 15 - Value (if output)
54 * bit 16..18 - SLPM pull up/down state
55 * bit 19..20 - SLPM direction
56 * bit 21..22 - SLPM Value (if output)
57 * bit 23..25 - PDIS value (if input)
58 * bit 26 - Gpio mode
59 * bit 27 - Sleep mode
60 *
61 * to facilitate the definition, the following macros are provided
62 *
63 * PIN_CFG_DEFAULT - default config (0):
64 * pull up/down = disabled
65 * sleep mode = input/wakeup
66 * direction = input
67 * value = low
68 * SLPM direction = same as normal
69 * SLPM pull = same as normal
70 * SLPM value = same as normal
71 *
72 * PIN_CFG - default config with alternate function
73 */
74
75 typedef unsigned long pin_cfg_t;
76
77 #define PIN_NUM_MASK 0x1ff
78 #define PIN_NUM(x) ((x) & PIN_NUM_MASK)
79
80 #define PIN_ALT_SHIFT 9
81 #define PIN_ALT_MASK (0x3 << PIN_ALT_SHIFT)
82 #define PIN_ALT(x) (((x) & PIN_ALT_MASK) >> PIN_ALT_SHIFT)
83 #define PIN_GPIO (NMK_GPIO_ALT_GPIO << PIN_ALT_SHIFT)
84 #define PIN_ALT_A (NMK_GPIO_ALT_A << PIN_ALT_SHIFT)
85 #define PIN_ALT_B (NMK_GPIO_ALT_B << PIN_ALT_SHIFT)
86 #define PIN_ALT_C (NMK_GPIO_ALT_C << PIN_ALT_SHIFT)
87
88 #define PIN_PULL_SHIFT 11
89 #define PIN_PULL_MASK (0x3 << PIN_PULL_SHIFT)
90 #define PIN_PULL(x) (((x) & PIN_PULL_MASK) >> PIN_PULL_SHIFT)
91 #define PIN_PULL_NONE (NMK_GPIO_PULL_NONE << PIN_PULL_SHIFT)
92 #define PIN_PULL_UP (NMK_GPIO_PULL_UP << PIN_PULL_SHIFT)
93 #define PIN_PULL_DOWN (NMK_GPIO_PULL_DOWN << PIN_PULL_SHIFT)
94
95 #define PIN_SLPM_SHIFT 13
96 #define PIN_SLPM_MASK (0x1 << PIN_SLPM_SHIFT)
97 #define PIN_SLPM(x) (((x) & PIN_SLPM_MASK) >> PIN_SLPM_SHIFT)
98 #define PIN_SLPM_MAKE_INPUT (NMK_GPIO_SLPM_INPUT << PIN_SLPM_SHIFT)
99 #define PIN_SLPM_NOCHANGE (NMK_GPIO_SLPM_NOCHANGE << PIN_SLPM_SHIFT)
100 /* These two replace the above in DB8500v2+ */
101 #define PIN_SLPM_WAKEUP_ENABLE (NMK_GPIO_SLPM_WAKEUP_ENABLE << PIN_SLPM_SHIFT)
102 #define PIN_SLPM_WAKEUP_DISABLE (NMK_GPIO_SLPM_WAKEUP_DISABLE << PIN_SLPM_SHIFT)
103 #define PIN_SLPM_USE_MUX_SETTINGS_IN_SLEEP PIN_SLPM_WAKEUP_DISABLE
104
105 #define PIN_SLPM_GPIO PIN_SLPM_WAKEUP_ENABLE /* In SLPM, pin is a gpio */
106 #define PIN_SLPM_ALTFUNC PIN_SLPM_WAKEUP_DISABLE /* In SLPM, pin is altfunc */
107
108 #define PIN_DIR_SHIFT 14
109 #define PIN_DIR_MASK (0x1 << PIN_DIR_SHIFT)
110 #define PIN_DIR(x) (((x) & PIN_DIR_MASK) >> PIN_DIR_SHIFT)
111 #define PIN_DIR_INPUT (0 << PIN_DIR_SHIFT)
112 #define PIN_DIR_OUTPUT (1 << PIN_DIR_SHIFT)
113
114 #define PIN_VAL_SHIFT 15
115 #define PIN_VAL_MASK (0x1 << PIN_VAL_SHIFT)
116 #define PIN_VAL(x) (((x) & PIN_VAL_MASK) >> PIN_VAL_SHIFT)
117 #define PIN_VAL_LOW (0 << PIN_VAL_SHIFT)
118 #define PIN_VAL_HIGH (1 << PIN_VAL_SHIFT)
119
120 #define PIN_SLPM_PULL_SHIFT 16
121 #define PIN_SLPM_PULL_MASK (0x7 << PIN_SLPM_PULL_SHIFT)
122 #define PIN_SLPM_PULL(x) \
123 (((x) & PIN_SLPM_PULL_MASK) >> PIN_SLPM_PULL_SHIFT)
124 #define PIN_SLPM_PULL_NONE \
125 ((1 + NMK_GPIO_PULL_NONE) << PIN_SLPM_PULL_SHIFT)
126 #define PIN_SLPM_PULL_UP \
127 ((1 + NMK_GPIO_PULL_UP) << PIN_SLPM_PULL_SHIFT)
128 #define PIN_SLPM_PULL_DOWN \
129 ((1 + NMK_GPIO_PULL_DOWN) << PIN_SLPM_PULL_SHIFT)
130
131 #define PIN_SLPM_DIR_SHIFT 19
132 #define PIN_SLPM_DIR_MASK (0x3 << PIN_SLPM_DIR_SHIFT)
133 #define PIN_SLPM_DIR(x) \
134 (((x) & PIN_SLPM_DIR_MASK) >> PIN_SLPM_DIR_SHIFT)
135 #define PIN_SLPM_DIR_INPUT ((1 + 0) << PIN_SLPM_DIR_SHIFT)
136 #define PIN_SLPM_DIR_OUTPUT ((1 + 1) << PIN_SLPM_DIR_SHIFT)
137
138 #define PIN_SLPM_VAL_SHIFT 21
139 #define PIN_SLPM_VAL_MASK (0x3 << PIN_SLPM_VAL_SHIFT)
140 #define PIN_SLPM_VAL(x) \
141 (((x) & PIN_SLPM_VAL_MASK) >> PIN_SLPM_VAL_SHIFT)
142 #define PIN_SLPM_VAL_LOW ((1 + 0) << PIN_SLPM_VAL_SHIFT)
143 #define PIN_SLPM_VAL_HIGH ((1 + 1) << PIN_SLPM_VAL_SHIFT)
144
145 #define PIN_SLPM_PDIS_SHIFT 23
146 #define PIN_SLPM_PDIS_MASK (0x3 << PIN_SLPM_PDIS_SHIFT)
147 #define PIN_SLPM_PDIS(x) \
148 (((x) & PIN_SLPM_PDIS_MASK) >> PIN_SLPM_PDIS_SHIFT)
149 #define PIN_SLPM_PDIS_NO_CHANGE (0 << PIN_SLPM_PDIS_SHIFT)
150 #define PIN_SLPM_PDIS_DISABLED (1 << PIN_SLPM_PDIS_SHIFT)
151 #define PIN_SLPM_PDIS_ENABLED (2 << PIN_SLPM_PDIS_SHIFT)
152
153 #define PIN_LOWEMI_SHIFT 25
154 #define PIN_LOWEMI_MASK (0x1 << PIN_LOWEMI_SHIFT)
155 #define PIN_LOWEMI(x) (((x) & PIN_LOWEMI_MASK) >> PIN_LOWEMI_SHIFT)
156 #define PIN_LOWEMI_DISABLED (0 << PIN_LOWEMI_SHIFT)
157 #define PIN_LOWEMI_ENABLED (1 << PIN_LOWEMI_SHIFT)
158
159 #define PIN_GPIOMODE_SHIFT 26
160 #define PIN_GPIOMODE_MASK (0x1 << PIN_GPIOMODE_SHIFT)
161 #define PIN_GPIOMODE(x) (((x) & PIN_GPIOMODE_MASK) >> PIN_GPIOMODE_SHIFT)
162 #define PIN_GPIOMODE_DISABLED (0 << PIN_GPIOMODE_SHIFT)
163 #define PIN_GPIOMODE_ENABLED (1 << PIN_GPIOMODE_SHIFT)
164
165 #define PIN_SLEEPMODE_SHIFT 27
166 #define PIN_SLEEPMODE_MASK (0x1 << PIN_SLEEPMODE_SHIFT)
167 #define PIN_SLEEPMODE(x) (((x) & PIN_SLEEPMODE_MASK) >> PIN_SLEEPMODE_SHIFT)
168 #define PIN_SLEEPMODE_DISABLED (0 << PIN_SLEEPMODE_SHIFT)
169 #define PIN_SLEEPMODE_ENABLED (1 << PIN_SLEEPMODE_SHIFT)
170
171
172 /* Shortcuts. Use these instead of separate DIR, PULL, and VAL. */
173 #define PIN_INPUT_PULLDOWN (PIN_DIR_INPUT | PIN_PULL_DOWN)
174 #define PIN_INPUT_PULLUP (PIN_DIR_INPUT | PIN_PULL_UP)
175 #define PIN_INPUT_NOPULL (PIN_DIR_INPUT | PIN_PULL_NONE)
176 #define PIN_OUTPUT_LOW (PIN_DIR_OUTPUT | PIN_VAL_LOW)
177 #define PIN_OUTPUT_HIGH (PIN_DIR_OUTPUT | PIN_VAL_HIGH)
178
179 #define PIN_SLPM_INPUT_PULLDOWN (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_DOWN)
180 #define PIN_SLPM_INPUT_PULLUP (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_UP)
181 #define PIN_SLPM_INPUT_NOPULL (PIN_SLPM_DIR_INPUT | PIN_SLPM_PULL_NONE)
182 #define PIN_SLPM_OUTPUT_LOW (PIN_SLPM_DIR_OUTPUT | PIN_SLPM_VAL_LOW)
183 #define PIN_SLPM_OUTPUT_HIGH (PIN_SLPM_DIR_OUTPUT | PIN_SLPM_VAL_HIGH)
184
185 #define PIN_CFG_DEFAULT (0)
186
187 #define PIN_CFG(num, alt) \
188 (PIN_CFG_DEFAULT |\
189 (PIN_NUM(num) | PIN_##alt))
190
191 #define PIN_CFG_INPUT(num, alt, pull) \
192 (PIN_CFG_DEFAULT |\
193 (PIN_NUM(num) | PIN_##alt | PIN_INPUT_##pull))
194
195 #define PIN_CFG_OUTPUT(num, alt, val) \
196 (PIN_CFG_DEFAULT |\
197 (PIN_NUM(num) | PIN_##alt | PIN_OUTPUT_##val))
198
199 /*
200 * "nmk_gpio" and "NMK_GPIO" stand for "Nomadik GPIO", leaving
201 * the "gpio" namespace for generic and cross-machine functions
202 */
203
204 #define GPIO_BLOCK_SHIFT 5
205 #define NMK_GPIO_PER_CHIP (1 << GPIO_BLOCK_SHIFT)
206 #define NMK_MAX_BANKS DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)
207
208 /* Register in the logic block */
209 #define NMK_GPIO_DAT 0x00
210 #define NMK_GPIO_DATS 0x04
211 #define NMK_GPIO_DATC 0x08
212 #define NMK_GPIO_PDIS 0x0c
213 #define NMK_GPIO_DIR 0x10
214 #define NMK_GPIO_DIRS 0x14
215 #define NMK_GPIO_DIRC 0x18
216 #define NMK_GPIO_SLPC 0x1c
217 #define NMK_GPIO_AFSLA 0x20
218 #define NMK_GPIO_AFSLB 0x24
219 #define NMK_GPIO_LOWEMI 0x28
220
221 #define NMK_GPIO_RIMSC 0x40
222 #define NMK_GPIO_FIMSC 0x44
223 #define NMK_GPIO_IS 0x48
224 #define NMK_GPIO_IC 0x4c
225 #define NMK_GPIO_RWIMSC 0x50
226 #define NMK_GPIO_FWIMSC 0x54
227 #define NMK_GPIO_WKS 0x58
228 /* These appear in DB8540 and later ASICs */
229 #define NMK_GPIO_EDGELEVEL 0x5C
230 #define NMK_GPIO_LEVEL 0x60
231
232
233 /* Pull up/down values */
234 enum nmk_gpio_pull {
235 NMK_GPIO_PULL_NONE,
236 NMK_GPIO_PULL_UP,
237 NMK_GPIO_PULL_DOWN,
238 };
239
240 /* Sleep mode */
241 enum nmk_gpio_slpm {
242 NMK_GPIO_SLPM_INPUT,
243 NMK_GPIO_SLPM_WAKEUP_ENABLE = NMK_GPIO_SLPM_INPUT,
244 NMK_GPIO_SLPM_NOCHANGE,
245 NMK_GPIO_SLPM_WAKEUP_DISABLE = NMK_GPIO_SLPM_NOCHANGE,
246 };
247
248 struct nmk_gpio_chip {
249 struct gpio_chip chip;
250 struct irq_chip irqchip;
251 void __iomem *addr;
252 struct clk *clk;
253 unsigned int bank;
254 unsigned int parent_irq;
255 int latent_parent_irq;
256 u32 (*get_latent_status)(unsigned int bank);
257 void (*set_ioforce)(bool enable);
258 spinlock_t lock;
259 bool sleepmode;
260 /* Keep track of configured edges */
261 u32 edge_rising;
262 u32 edge_falling;
263 u32 real_wake;
264 u32 rwimsc;
265 u32 fwimsc;
266 u32 rimsc;
267 u32 fimsc;
268 u32 pull_up;
269 u32 lowemi;
270 };
271
272 /**
273 * struct nmk_pinctrl - state container for the Nomadik pin controller
274 * @dev: containing device pointer
275 * @pctl: corresponding pin controller device
276 * @soc: SoC data for this specific chip
277 * @prcm_base: PRCM register range virtual base
278 */
279 struct nmk_pinctrl {
280 struct device *dev;
281 struct pinctrl_dev *pctl;
282 const struct nmk_pinctrl_soc_data *soc;
283 void __iomem *prcm_base;
284 };
285
286 static struct nmk_gpio_chip *nmk_gpio_chips[NMK_MAX_BANKS];
287
288 static DEFINE_SPINLOCK(nmk_gpio_slpm_lock);
289
290 #define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips)
291
292 static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
293 unsigned offset, int gpio_mode)
294 {
295 u32 bit = 1 << offset;
296 u32 afunc, bfunc;
297
298 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit;
299 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit;
300 if (gpio_mode & NMK_GPIO_ALT_A)
301 afunc |= bit;
302 if (gpio_mode & NMK_GPIO_ALT_B)
303 bfunc |= bit;
304 writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA);
305 writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB);
306 }
307
308 static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip,
309 unsigned offset, enum nmk_gpio_slpm mode)
310 {
311 u32 bit = 1 << offset;
312 u32 slpm;
313
314 slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC);
315 if (mode == NMK_GPIO_SLPM_NOCHANGE)
316 slpm |= bit;
317 else
318 slpm &= ~bit;
319 writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC);
320 }
321
322 static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
323 unsigned offset, enum nmk_gpio_pull pull)
324 {
325 u32 bit = 1 << offset;
326 u32 pdis;
327
328 pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS);
329 if (pull == NMK_GPIO_PULL_NONE) {
330 pdis |= bit;
331 nmk_chip->pull_up &= ~bit;
332 } else {
333 pdis &= ~bit;
334 }
335
336 writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS);
337
338 if (pull == NMK_GPIO_PULL_UP) {
339 nmk_chip->pull_up |= bit;
340 writel(bit, nmk_chip->addr + NMK_GPIO_DATS);
341 } else if (pull == NMK_GPIO_PULL_DOWN) {
342 nmk_chip->pull_up &= ~bit;
343 writel(bit, nmk_chip->addr + NMK_GPIO_DATC);
344 }
345 }
346
347 static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
348 unsigned offset, bool lowemi)
349 {
350 u32 bit = BIT(offset);
351 bool enabled = nmk_chip->lowemi & bit;
352
353 if (lowemi == enabled)
354 return;
355
356 if (lowemi)
357 nmk_chip->lowemi |= bit;
358 else
359 nmk_chip->lowemi &= ~bit;
360
361 writel_relaxed(nmk_chip->lowemi,
362 nmk_chip->addr + NMK_GPIO_LOWEMI);
363 }
364
365 static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
366 unsigned offset)
367 {
368 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
369 }
370
371 static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip,
372 unsigned offset, int val)
373 {
374 if (val)
375 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS);
376 else
377 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC);
378 }
379
380 static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip,
381 unsigned offset, int val)
382 {
383 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS);
384 __nmk_gpio_set_output(nmk_chip, offset, val);
385 }
386
387 static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip,
388 unsigned offset, int gpio_mode,
389 bool glitch)
390 {
391 u32 rwimsc = nmk_chip->rwimsc;
392 u32 fwimsc = nmk_chip->fwimsc;
393
394 if (glitch && nmk_chip->set_ioforce) {
395 u32 bit = BIT(offset);
396
397 /* Prevent spurious wakeups */
398 writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC);
399 writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC);
400
401 nmk_chip->set_ioforce(true);
402 }
403
404 __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode);
405
406 if (glitch && nmk_chip->set_ioforce) {
407 nmk_chip->set_ioforce(false);
408
409 writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC);
410 writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC);
411 }
412 }
413
414 static void
415 nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset)
416 {
417 u32 falling = nmk_chip->fimsc & BIT(offset);
418 u32 rising = nmk_chip->rimsc & BIT(offset);
419 int gpio = nmk_chip->chip.base + offset;
420 int irq = irq_find_mapping(nmk_chip->chip.irqdomain, offset);
421 struct irq_data *d = irq_get_irq_data(irq);
422
423 if (!rising && !falling)
424 return;
425
426 if (!d || !irqd_irq_disabled(d))
427 return;
428
429 if (rising) {
430 nmk_chip->rimsc &= ~BIT(offset);
431 writel_relaxed(nmk_chip->rimsc,
432 nmk_chip->addr + NMK_GPIO_RIMSC);
433 }
434
435 if (falling) {
436 nmk_chip->fimsc &= ~BIT(offset);
437 writel_relaxed(nmk_chip->fimsc,
438 nmk_chip->addr + NMK_GPIO_FIMSC);
439 }
440
441 dev_dbg(nmk_chip->chip.parent, "%d: clearing interrupt mask\n", gpio);
442 }
443
444 static void nmk_write_masked(void __iomem *reg, u32 mask, u32 value)
445 {
446 u32 val;
447
448 val = readl(reg);
449 val = ((val & ~mask) | (value & mask));
450 writel(val, reg);
451 }
452
453 static void nmk_prcm_altcx_set_mode(struct nmk_pinctrl *npct,
454 unsigned offset, unsigned alt_num)
455 {
456 int i;
457 u16 reg;
458 u8 bit;
459 u8 alt_index;
460 const struct prcm_gpiocr_altcx_pin_desc *pin_desc;
461 const u16 *gpiocr_regs;
462
463 if (!npct->prcm_base)
464 return;
465
466 if (alt_num > PRCM_IDX_GPIOCR_ALTC_MAX) {
467 dev_err(npct->dev, "PRCM GPIOCR: alternate-C%i is invalid\n",
468 alt_num);
469 return;
470 }
471
472 for (i = 0 ; i < npct->soc->npins_altcx ; i++) {
473 if (npct->soc->altcx_pins[i].pin == offset)
474 break;
475 }
476 if (i == npct->soc->npins_altcx) {
477 dev_dbg(npct->dev, "PRCM GPIOCR: pin %i is not found\n",
478 offset);
479 return;
480 }
481
482 pin_desc = npct->soc->altcx_pins + i;
483 gpiocr_regs = npct->soc->prcm_gpiocr_registers;
484
485 /*
486 * If alt_num is NULL, just clear current ALTCx selection
487 * to make sure we come back to a pure ALTC selection
488 */
489 if (!alt_num) {
490 for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) {
491 if (pin_desc->altcx[i].used == true) {
492 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
493 bit = pin_desc->altcx[i].control_bit;
494 if (readl(npct->prcm_base + reg) & BIT(bit)) {
495 nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0);
496 dev_dbg(npct->dev,
497 "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
498 offset, i+1);
499 }
500 }
501 }
502 return;
503 }
504
505 alt_index = alt_num - 1;
506 if (pin_desc->altcx[alt_index].used == false) {
507 dev_warn(npct->dev,
508 "PRCM GPIOCR: pin %i: alternate-C%i does not exist\n",
509 offset, alt_num);
510 return;
511 }
512
513 /*
514 * Check if any other ALTCx functions are activated on this pin
515 * and disable it first.
516 */
517 for (i = 0 ; i < PRCM_IDX_GPIOCR_ALTC_MAX ; i++) {
518 if (i == alt_index)
519 continue;
520 if (pin_desc->altcx[i].used == true) {
521 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
522 bit = pin_desc->altcx[i].control_bit;
523 if (readl(npct->prcm_base + reg) & BIT(bit)) {
524 nmk_write_masked(npct->prcm_base + reg, BIT(bit), 0);
525 dev_dbg(npct->dev,
526 "PRCM GPIOCR: pin %i: alternate-C%i has been disabled\n",
527 offset, i+1);
528 }
529 }
530 }
531
532 reg = gpiocr_regs[pin_desc->altcx[alt_index].reg_index];
533 bit = pin_desc->altcx[alt_index].control_bit;
534 dev_dbg(npct->dev, "PRCM GPIOCR: pin %i: alternate-C%i has been selected\n",
535 offset, alt_index+1);
536 nmk_write_masked(npct->prcm_base + reg, BIT(bit), BIT(bit));
537 }
538
539 /*
540 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
541 * - Save SLPM registers
542 * - Set SLPM=0 for the IOs you want to switch and others to 1
543 * - Configure the GPIO registers for the IOs that are being switched
544 * - Set IOFORCE=1
545 * - Modify the AFLSA/B registers for the IOs that are being switched
546 * - Set IOFORCE=0
547 * - Restore SLPM registers
548 * - Any spurious wake up event during switch sequence to be ignored and
549 * cleared
550 */
551 static void nmk_gpio_glitch_slpm_init(unsigned int *slpm)
552 {
553 int i;
554
555 for (i = 0; i < NUM_BANKS; i++) {
556 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
557 unsigned int temp = slpm[i];
558
559 if (!chip)
560 break;
561
562 clk_enable(chip->clk);
563
564 slpm[i] = readl(chip->addr + NMK_GPIO_SLPC);
565 writel(temp, chip->addr + NMK_GPIO_SLPC);
566 }
567 }
568
569 static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm)
570 {
571 int i;
572
573 for (i = 0; i < NUM_BANKS; i++) {
574 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
575
576 if (!chip)
577 break;
578
579 writel(slpm[i], chip->addr + NMK_GPIO_SLPC);
580
581 clk_disable(chip->clk);
582 }
583 }
584
585 static int __maybe_unused nmk_prcm_gpiocr_get_mode(struct pinctrl_dev *pctldev, int gpio)
586 {
587 int i;
588 u16 reg;
589 u8 bit;
590 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
591 const struct prcm_gpiocr_altcx_pin_desc *pin_desc;
592 const u16 *gpiocr_regs;
593
594 if (!npct->prcm_base)
595 return NMK_GPIO_ALT_C;
596
597 for (i = 0; i < npct->soc->npins_altcx; i++) {
598 if (npct->soc->altcx_pins[i].pin == gpio)
599 break;
600 }
601 if (i == npct->soc->npins_altcx)
602 return NMK_GPIO_ALT_C;
603
604 pin_desc = npct->soc->altcx_pins + i;
605 gpiocr_regs = npct->soc->prcm_gpiocr_registers;
606 for (i = 0; i < PRCM_IDX_GPIOCR_ALTC_MAX; i++) {
607 if (pin_desc->altcx[i].used == true) {
608 reg = gpiocr_regs[pin_desc->altcx[i].reg_index];
609 bit = pin_desc->altcx[i].control_bit;
610 if (readl(npct->prcm_base + reg) & BIT(bit))
611 return NMK_GPIO_ALT_C+i+1;
612 }
613 }
614 return NMK_GPIO_ALT_C;
615 }
616
617 int nmk_gpio_get_mode(int gpio)
618 {
619 struct nmk_gpio_chip *nmk_chip;
620 u32 afunc, bfunc, bit;
621
622 nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
623 if (!nmk_chip)
624 return -EINVAL;
625
626 bit = 1 << (gpio % NMK_GPIO_PER_CHIP);
627
628 clk_enable(nmk_chip->clk);
629
630 afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit;
631 bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit;
632
633 clk_disable(nmk_chip->clk);
634
635 return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0);
636 }
637 EXPORT_SYMBOL(nmk_gpio_get_mode);
638
639
640 /* IRQ functions */
641 static inline int nmk_gpio_get_bitmask(int gpio)
642 {
643 return 1 << (gpio % NMK_GPIO_PER_CHIP);
644 }
645
646 static void nmk_gpio_irq_ack(struct irq_data *d)
647 {
648 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
649 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
650
651 clk_enable(nmk_chip->clk);
652 writel(nmk_gpio_get_bitmask(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
653 clk_disable(nmk_chip->clk);
654 }
655
656 enum nmk_gpio_irq_type {
657 NORMAL,
658 WAKE,
659 };
660
661 static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
662 int gpio, enum nmk_gpio_irq_type which,
663 bool enable)
664 {
665 u32 bitmask = nmk_gpio_get_bitmask(gpio);
666 u32 *rimscval;
667 u32 *fimscval;
668 u32 rimscreg;
669 u32 fimscreg;
670
671 if (which == NORMAL) {
672 rimscreg = NMK_GPIO_RIMSC;
673 fimscreg = NMK_GPIO_FIMSC;
674 rimscval = &nmk_chip->rimsc;
675 fimscval = &nmk_chip->fimsc;
676 } else {
677 rimscreg = NMK_GPIO_RWIMSC;
678 fimscreg = NMK_GPIO_FWIMSC;
679 rimscval = &nmk_chip->rwimsc;
680 fimscval = &nmk_chip->fwimsc;
681 }
682
683 /* we must individually set/clear the two edges */
684 if (nmk_chip->edge_rising & bitmask) {
685 if (enable)
686 *rimscval |= bitmask;
687 else
688 *rimscval &= ~bitmask;
689 writel(*rimscval, nmk_chip->addr + rimscreg);
690 }
691 if (nmk_chip->edge_falling & bitmask) {
692 if (enable)
693 *fimscval |= bitmask;
694 else
695 *fimscval &= ~bitmask;
696 writel(*fimscval, nmk_chip->addr + fimscreg);
697 }
698 }
699
700 static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
701 int gpio, bool on)
702 {
703 /*
704 * Ensure WAKEUP_ENABLE is on. No need to disable it if wakeup is
705 * disabled, since setting SLPM to 1 increases power consumption, and
706 * wakeup is anyhow controlled by the RIMSC and FIMSC registers.
707 */
708 if (nmk_chip->sleepmode && on) {
709 __nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP,
710 NMK_GPIO_SLPM_WAKEUP_ENABLE);
711 }
712
713 __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
714 }
715
716 static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
717 {
718 struct nmk_gpio_chip *nmk_chip;
719 unsigned long flags;
720 u32 bitmask;
721
722 nmk_chip = irq_data_get_irq_chip_data(d);
723 bitmask = nmk_gpio_get_bitmask(d->hwirq);
724 if (!nmk_chip)
725 return -EINVAL;
726
727 clk_enable(nmk_chip->clk);
728 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
729 spin_lock(&nmk_chip->lock);
730
731 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable);
732
733 if (!(nmk_chip->real_wake & bitmask))
734 __nmk_gpio_set_wake(nmk_chip, d->hwirq, enable);
735
736 spin_unlock(&nmk_chip->lock);
737 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
738 clk_disable(nmk_chip->clk);
739
740 return 0;
741 }
742
743 static void nmk_gpio_irq_mask(struct irq_data *d)
744 {
745 nmk_gpio_irq_maskunmask(d, false);
746 }
747
748 static void nmk_gpio_irq_unmask(struct irq_data *d)
749 {
750 nmk_gpio_irq_maskunmask(d, true);
751 }
752
753 static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
754 {
755 struct nmk_gpio_chip *nmk_chip;
756 unsigned long flags;
757 u32 bitmask;
758
759 nmk_chip = irq_data_get_irq_chip_data(d);
760 if (!nmk_chip)
761 return -EINVAL;
762 bitmask = nmk_gpio_get_bitmask(d->hwirq);
763
764 clk_enable(nmk_chip->clk);
765 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
766 spin_lock(&nmk_chip->lock);
767
768 if (irqd_irq_disabled(d))
769 __nmk_gpio_set_wake(nmk_chip, d->hwirq, on);
770
771 if (on)
772 nmk_chip->real_wake |= bitmask;
773 else
774 nmk_chip->real_wake &= ~bitmask;
775
776 spin_unlock(&nmk_chip->lock);
777 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
778 clk_disable(nmk_chip->clk);
779
780 return 0;
781 }
782
783 static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
784 {
785 bool enabled = !irqd_irq_disabled(d);
786 bool wake = irqd_is_wakeup_set(d);
787 struct nmk_gpio_chip *nmk_chip;
788 unsigned long flags;
789 u32 bitmask;
790
791 nmk_chip = irq_data_get_irq_chip_data(d);
792 bitmask = nmk_gpio_get_bitmask(d->hwirq);
793 if (!nmk_chip)
794 return -EINVAL;
795 if (type & IRQ_TYPE_LEVEL_HIGH)
796 return -EINVAL;
797 if (type & IRQ_TYPE_LEVEL_LOW)
798 return -EINVAL;
799
800 clk_enable(nmk_chip->clk);
801 spin_lock_irqsave(&nmk_chip->lock, flags);
802
803 if (enabled)
804 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false);
805
806 if (enabled || wake)
807 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false);
808
809 nmk_chip->edge_rising &= ~bitmask;
810 if (type & IRQ_TYPE_EDGE_RISING)
811 nmk_chip->edge_rising |= bitmask;
812
813 nmk_chip->edge_falling &= ~bitmask;
814 if (type & IRQ_TYPE_EDGE_FALLING)
815 nmk_chip->edge_falling |= bitmask;
816
817 if (enabled)
818 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true);
819
820 if (enabled || wake)
821 __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true);
822
823 spin_unlock_irqrestore(&nmk_chip->lock, flags);
824 clk_disable(nmk_chip->clk);
825
826 return 0;
827 }
828
829 static unsigned int nmk_gpio_irq_startup(struct irq_data *d)
830 {
831 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
832
833 clk_enable(nmk_chip->clk);
834 nmk_gpio_irq_unmask(d);
835 return 0;
836 }
837
838 static void nmk_gpio_irq_shutdown(struct irq_data *d)
839 {
840 struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d);
841
842 nmk_gpio_irq_mask(d);
843 clk_disable(nmk_chip->clk);
844 }
845
846 static void __nmk_gpio_irq_handler(struct irq_desc *desc, u32 status)
847 {
848 struct irq_chip *host_chip = irq_desc_get_chip(desc);
849 struct gpio_chip *chip = irq_desc_get_handler_data(desc);
850
851 chained_irq_enter(host_chip, desc);
852
853 while (status) {
854 int bit = __ffs(status);
855
856 generic_handle_irq(irq_find_mapping(chip->irqdomain, bit));
857 status &= ~BIT(bit);
858 }
859
860 chained_irq_exit(host_chip, desc);
861 }
862
863 static void nmk_gpio_irq_handler(struct irq_desc *desc)
864 {
865 struct gpio_chip *chip = irq_desc_get_handler_data(desc);
866 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
867 u32 status;
868
869 clk_enable(nmk_chip->clk);
870 status = readl(nmk_chip->addr + NMK_GPIO_IS);
871 clk_disable(nmk_chip->clk);
872
873 __nmk_gpio_irq_handler(desc, status);
874 }
875
876 static void nmk_gpio_latent_irq_handler(struct irq_desc *desc)
877 {
878 struct gpio_chip *chip = irq_desc_get_handler_data(desc);
879 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
880 u32 status = nmk_chip->get_latent_status(nmk_chip->bank);
881
882 __nmk_gpio_irq_handler(desc, status);
883 }
884
885 /* I/O Functions */
886
887 static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset)
888 {
889 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
890
891 clk_enable(nmk_chip->clk);
892
893 writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC);
894
895 clk_disable(nmk_chip->clk);
896
897 return 0;
898 }
899
900 static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset)
901 {
902 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
903 u32 bit = 1 << offset;
904 int value;
905
906 clk_enable(nmk_chip->clk);
907
908 value = (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0;
909
910 clk_disable(nmk_chip->clk);
911
912 return value;
913 }
914
915 static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset,
916 int val)
917 {
918 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
919
920 clk_enable(nmk_chip->clk);
921
922 __nmk_gpio_set_output(nmk_chip, offset, val);
923
924 clk_disable(nmk_chip->clk);
925 }
926
927 static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset,
928 int val)
929 {
930 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
931
932 clk_enable(nmk_chip->clk);
933
934 __nmk_gpio_make_output(nmk_chip, offset, val);
935
936 clk_disable(nmk_chip->clk);
937
938 return 0;
939 }
940
941 #ifdef CONFIG_DEBUG_FS
942
943 #include <linux/seq_file.h>
944
945 static void nmk_gpio_dbg_show_one(struct seq_file *s,
946 struct pinctrl_dev *pctldev, struct gpio_chip *chip,
947 unsigned offset, unsigned gpio)
948 {
949 const char *label = gpiochip_is_requested(chip, offset);
950 struct nmk_gpio_chip *nmk_chip = gpiochip_get_data(chip);
951 int mode;
952 bool is_out;
953 bool data_out;
954 bool pull;
955 u32 bit = 1 << offset;
956 const char *modes[] = {
957 [NMK_GPIO_ALT_GPIO] = "gpio",
958 [NMK_GPIO_ALT_A] = "altA",
959 [NMK_GPIO_ALT_B] = "altB",
960 [NMK_GPIO_ALT_C] = "altC",
961 [NMK_GPIO_ALT_C+1] = "altC1",
962 [NMK_GPIO_ALT_C+2] = "altC2",
963 [NMK_GPIO_ALT_C+3] = "altC3",
964 [NMK_GPIO_ALT_C+4] = "altC4",
965 };
966 const char *pulls[] = {
967 "none ",
968 "pull down",
969 "pull up ",
970 };
971
972 clk_enable(nmk_chip->clk);
973 is_out = !!(readl(nmk_chip->addr + NMK_GPIO_DIR) & bit);
974 pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
975 data_out = !!(readl(nmk_chip->addr + NMK_GPIO_DAT) & bit);
976 mode = nmk_gpio_get_mode(gpio);
977 if ((mode == NMK_GPIO_ALT_C) && pctldev)
978 mode = nmk_prcm_gpiocr_get_mode(pctldev, gpio);
979
980 if (is_out) {
981 seq_printf(s, " gpio-%-3d (%-20.20s) out %s %s",
982 gpio,
983 label ?: "(none)",
984 data_out ? "hi" : "lo",
985 (mode < 0) ? "unknown" : modes[mode]);
986 } else {
987 int irq = gpio_to_irq(gpio);
988 struct irq_desc *desc = irq_to_desc(irq);
989 int pullidx = 0;
990 int val;
991
992 if (pull)
993 pullidx = data_out ? 2 : 1;
994
995 seq_printf(s, " gpio-%-3d (%-20.20s) in %s %s",
996 gpio,
997 label ?: "(none)",
998 pulls[pullidx],
999 (mode < 0) ? "unknown" : modes[mode]);
1000
1001 val = nmk_gpio_get_input(chip, offset);
1002 seq_printf(s, " VAL %d", val);
1003
1004 /*
1005 * This races with request_irq(), set_irq_type(),
1006 * and set_irq_wake() ... but those are "rare".
1007 */
1008 if (irq > 0 && desc && desc->action) {
1009 char *trigger;
1010 u32 bitmask = nmk_gpio_get_bitmask(gpio);
1011
1012 if (nmk_chip->edge_rising & bitmask)
1013 trigger = "edge-rising";
1014 else if (nmk_chip->edge_falling & bitmask)
1015 trigger = "edge-falling";
1016 else
1017 trigger = "edge-undefined";
1018
1019 seq_printf(s, " irq-%d %s%s",
1020 irq, trigger,
1021 irqd_is_wakeup_set(&desc->irq_data)
1022 ? " wakeup" : "");
1023 }
1024 }
1025 clk_disable(nmk_chip->clk);
1026 }
1027
1028 static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1029 {
1030 unsigned i;
1031 unsigned gpio = chip->base;
1032
1033 for (i = 0; i < chip->ngpio; i++, gpio++) {
1034 nmk_gpio_dbg_show_one(s, NULL, chip, i, gpio);
1035 seq_printf(s, "\n");
1036 }
1037 }
1038
1039 #else
1040 static inline void nmk_gpio_dbg_show_one(struct seq_file *s,
1041 struct pinctrl_dev *pctldev,
1042 struct gpio_chip *chip,
1043 unsigned offset, unsigned gpio)
1044 {
1045 }
1046 #define nmk_gpio_dbg_show NULL
1047 #endif
1048
1049 void nmk_gpio_clocks_enable(void)
1050 {
1051 int i;
1052
1053 for (i = 0; i < NUM_BANKS; i++) {
1054 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1055
1056 if (!chip)
1057 continue;
1058
1059 clk_enable(chip->clk);
1060 }
1061 }
1062
1063 void nmk_gpio_clocks_disable(void)
1064 {
1065 int i;
1066
1067 for (i = 0; i < NUM_BANKS; i++) {
1068 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1069
1070 if (!chip)
1071 continue;
1072
1073 clk_disable(chip->clk);
1074 }
1075 }
1076
1077 /*
1078 * Called from the suspend/resume path to only keep the real wakeup interrupts
1079 * (those that have had set_irq_wake() called on them) as wakeup interrupts,
1080 * and not the rest of the interrupts which we needed to have as wakeups for
1081 * cpuidle.
1082 *
1083 * PM ops are not used since this needs to be done at the end, after all the
1084 * other drivers are done with their suspend callbacks.
1085 */
1086 void nmk_gpio_wakeups_suspend(void)
1087 {
1088 int i;
1089
1090 for (i = 0; i < NUM_BANKS; i++) {
1091 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1092
1093 if (!chip)
1094 break;
1095
1096 clk_enable(chip->clk);
1097
1098 writel(chip->rwimsc & chip->real_wake,
1099 chip->addr + NMK_GPIO_RWIMSC);
1100 writel(chip->fwimsc & chip->real_wake,
1101 chip->addr + NMK_GPIO_FWIMSC);
1102
1103 clk_disable(chip->clk);
1104 }
1105 }
1106
1107 void nmk_gpio_wakeups_resume(void)
1108 {
1109 int i;
1110
1111 for (i = 0; i < NUM_BANKS; i++) {
1112 struct nmk_gpio_chip *chip = nmk_gpio_chips[i];
1113
1114 if (!chip)
1115 break;
1116
1117 clk_enable(chip->clk);
1118
1119 writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
1120 writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);
1121
1122 clk_disable(chip->clk);
1123 }
1124 }
1125
1126 /*
1127 * Read the pull up/pull down status.
1128 * A bit set in 'pull_up' means that pull up
1129 * is selected if pull is enabled in PDIS register.
1130 * Note: only pull up/down set via this driver can
1131 * be detected due to HW limitations.
1132 */
1133 void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
1134 {
1135 if (gpio_bank < NUM_BANKS) {
1136 struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank];
1137
1138 if (!chip)
1139 return;
1140
1141 *pull_up = chip->pull_up;
1142 }
1143 }
1144
1145 /*
1146 * We will allocate memory for the state container using devm* allocators
1147 * binding to the first device reaching this point, it doesn't matter if
1148 * it is the pin controller or GPIO driver. However we need to use the right
1149 * platform device when looking up resources so pay attention to pdev.
1150 */
1151 static struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np,
1152 struct platform_device *pdev)
1153 {
1154 struct nmk_gpio_chip *nmk_chip;
1155 struct platform_device *gpio_pdev;
1156 struct gpio_chip *chip;
1157 struct resource *res;
1158 struct clk *clk;
1159 void __iomem *base;
1160 u32 id;
1161
1162 gpio_pdev = of_find_device_by_node(np);
1163 if (!gpio_pdev) {
1164 pr_err("populate \"%s\": device not found\n", np->name);
1165 return ERR_PTR(-ENODEV);
1166 }
1167 if (of_property_read_u32(np, "gpio-bank", &id)) {
1168 dev_err(&pdev->dev, "populate: gpio-bank property not found\n");
1169 return ERR_PTR(-EINVAL);
1170 }
1171
1172 /* Already populated? */
1173 nmk_chip = nmk_gpio_chips[id];
1174 if (nmk_chip)
1175 return nmk_chip;
1176
1177 nmk_chip = devm_kzalloc(&pdev->dev, sizeof(*nmk_chip), GFP_KERNEL);
1178 if (!nmk_chip)
1179 return ERR_PTR(-ENOMEM);
1180
1181 nmk_chip->bank = id;
1182 chip = &nmk_chip->chip;
1183 chip->base = id * NMK_GPIO_PER_CHIP;
1184 chip->ngpio = NMK_GPIO_PER_CHIP;
1185 chip->label = dev_name(&gpio_pdev->dev);
1186 chip->parent = &gpio_pdev->dev;
1187
1188 res = platform_get_resource(gpio_pdev, IORESOURCE_MEM, 0);
1189 base = devm_ioremap_resource(&pdev->dev, res);
1190 if (IS_ERR(base))
1191 return base;
1192 nmk_chip->addr = base;
1193
1194 clk = clk_get(&gpio_pdev->dev, NULL);
1195 if (IS_ERR(clk))
1196 return (void *) clk;
1197 clk_prepare(clk);
1198 nmk_chip->clk = clk;
1199
1200 BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips));
1201 nmk_gpio_chips[id] = nmk_chip;
1202 return nmk_chip;
1203 }
1204
1205 static int nmk_gpio_probe(struct platform_device *dev)
1206 {
1207 struct device_node *np = dev->dev.of_node;
1208 struct nmk_gpio_chip *nmk_chip;
1209 struct gpio_chip *chip;
1210 struct irq_chip *irqchip;
1211 int latent_irq;
1212 bool supports_sleepmode;
1213 int irq;
1214 int ret;
1215
1216 nmk_chip = nmk_gpio_populate_chip(np, dev);
1217 if (IS_ERR(nmk_chip)) {
1218 dev_err(&dev->dev, "could not populate nmk chip struct\n");
1219 return PTR_ERR(nmk_chip);
1220 }
1221
1222 if (of_get_property(np, "st,supports-sleepmode", NULL))
1223 supports_sleepmode = true;
1224 else
1225 supports_sleepmode = false;
1226
1227 /* Correct platform device ID */
1228 dev->id = nmk_chip->bank;
1229
1230 irq = platform_get_irq(dev, 0);
1231 if (irq < 0)
1232 return irq;
1233
1234 /* It's OK for this IRQ not to be present */
1235 latent_irq = platform_get_irq(dev, 1);
1236
1237 /*
1238 * The virt address in nmk_chip->addr is in the nomadik register space,
1239 * so we can simply convert the resource address, without remapping
1240 */
1241 nmk_chip->parent_irq = irq;
1242 nmk_chip->latent_parent_irq = latent_irq;
1243 nmk_chip->sleepmode = supports_sleepmode;
1244 spin_lock_init(&nmk_chip->lock);
1245
1246 chip = &nmk_chip->chip;
1247 chip->request = gpiochip_generic_request;
1248 chip->free = gpiochip_generic_free;
1249 chip->direction_input = nmk_gpio_make_input;
1250 chip->get = nmk_gpio_get_input;
1251 chip->direction_output = nmk_gpio_make_output;
1252 chip->set = nmk_gpio_set_output;
1253 chip->dbg_show = nmk_gpio_dbg_show;
1254 chip->can_sleep = false;
1255 chip->owner = THIS_MODULE;
1256
1257 irqchip = &nmk_chip->irqchip;
1258 irqchip->irq_ack = nmk_gpio_irq_ack;
1259 irqchip->irq_mask = nmk_gpio_irq_mask;
1260 irqchip->irq_unmask = nmk_gpio_irq_unmask;
1261 irqchip->irq_set_type = nmk_gpio_irq_set_type;
1262 irqchip->irq_set_wake = nmk_gpio_irq_set_wake;
1263 irqchip->irq_startup = nmk_gpio_irq_startup;
1264 irqchip->irq_shutdown = nmk_gpio_irq_shutdown;
1265 irqchip->flags = IRQCHIP_MASK_ON_SUSPEND;
1266 irqchip->name = kasprintf(GFP_KERNEL, "nmk%u-%u-%u",
1267 dev->id,
1268 chip->base,
1269 chip->base + chip->ngpio - 1);
1270
1271 clk_enable(nmk_chip->clk);
1272 nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
1273 clk_disable(nmk_chip->clk);
1274 chip->of_node = np;
1275
1276 ret = gpiochip_add_data(chip, nmk_chip);
1277 if (ret)
1278 return ret;
1279
1280 platform_set_drvdata(dev, nmk_chip);
1281
1282 /*
1283 * Let the generic code handle this edge IRQ, the the chained
1284 * handler will perform the actual work of handling the parent
1285 * interrupt.
1286 */
1287 ret = gpiochip_irqchip_add(chip,
1288 irqchip,
1289 0,
1290 handle_edge_irq,
1291 IRQ_TYPE_EDGE_FALLING);
1292 if (ret) {
1293 dev_err(&dev->dev, "could not add irqchip\n");
1294 gpiochip_remove(&nmk_chip->chip);
1295 return -ENODEV;
1296 }
1297 /* Then register the chain on the parent IRQ */
1298 gpiochip_set_chained_irqchip(chip,
1299 irqchip,
1300 nmk_chip->parent_irq,
1301 nmk_gpio_irq_handler);
1302 if (nmk_chip->latent_parent_irq > 0)
1303 gpiochip_set_chained_irqchip(chip,
1304 irqchip,
1305 nmk_chip->latent_parent_irq,
1306 nmk_gpio_latent_irq_handler);
1307
1308 dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);
1309
1310 return 0;
1311 }
1312
1313 static int nmk_get_groups_cnt(struct pinctrl_dev *pctldev)
1314 {
1315 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1316
1317 return npct->soc->ngroups;
1318 }
1319
1320 static const char *nmk_get_group_name(struct pinctrl_dev *pctldev,
1321 unsigned selector)
1322 {
1323 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1324
1325 return npct->soc->groups[selector].name;
1326 }
1327
1328 static int nmk_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
1329 const unsigned **pins,
1330 unsigned *num_pins)
1331 {
1332 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1333
1334 *pins = npct->soc->groups[selector].pins;
1335 *num_pins = npct->soc->groups[selector].npins;
1336 return 0;
1337 }
1338
1339 static struct nmk_gpio_chip *find_nmk_gpio_from_pin(unsigned pin)
1340 {
1341 int i;
1342 struct nmk_gpio_chip *nmk_gpio;
1343
1344 for(i = 0; i < NMK_MAX_BANKS; i++) {
1345 nmk_gpio = nmk_gpio_chips[i];
1346 if (!nmk_gpio)
1347 continue;
1348 if (pin >= nmk_gpio->chip.base &&
1349 pin < nmk_gpio->chip.base + nmk_gpio->chip.ngpio)
1350 return nmk_gpio;
1351 }
1352 return NULL;
1353 }
1354
1355 static struct gpio_chip *find_gc_from_pin(unsigned pin)
1356 {
1357 struct nmk_gpio_chip *nmk_gpio = find_nmk_gpio_from_pin(pin);
1358
1359 if (nmk_gpio)
1360 return &nmk_gpio->chip;
1361 return NULL;
1362 }
1363
1364 static void nmk_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
1365 unsigned offset)
1366 {
1367 struct gpio_chip *chip = find_gc_from_pin(offset);
1368
1369 if (!chip) {
1370 seq_printf(s, "invalid pin offset");
1371 return;
1372 }
1373 nmk_gpio_dbg_show_one(s, pctldev, chip, offset - chip->base, offset);
1374 }
1375
1376 static int nmk_dt_add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
1377 unsigned *num_maps, const char *group,
1378 const char *function)
1379 {
1380 if (*num_maps == *reserved_maps)
1381 return -ENOSPC;
1382
1383 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
1384 (*map)[*num_maps].data.mux.group = group;
1385 (*map)[*num_maps].data.mux.function = function;
1386 (*num_maps)++;
1387
1388 return 0;
1389 }
1390
1391 static int nmk_dt_add_map_configs(struct pinctrl_map **map,
1392 unsigned *reserved_maps,
1393 unsigned *num_maps, const char *group,
1394 unsigned long *configs, unsigned num_configs)
1395 {
1396 unsigned long *dup_configs;
1397
1398 if (*num_maps == *reserved_maps)
1399 return -ENOSPC;
1400
1401 dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
1402 GFP_KERNEL);
1403 if (!dup_configs)
1404 return -ENOMEM;
1405
1406 (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_PIN;
1407
1408 (*map)[*num_maps].data.configs.group_or_pin = group;
1409 (*map)[*num_maps].data.configs.configs = dup_configs;
1410 (*map)[*num_maps].data.configs.num_configs = num_configs;
1411 (*num_maps)++;
1412
1413 return 0;
1414 }
1415
1416 #define NMK_CONFIG_PIN(x, y) { .property = x, .config = y, }
1417 #define NMK_CONFIG_PIN_ARRAY(x, y) { .property = x, .choice = y, \
1418 .size = ARRAY_SIZE(y), }
1419
1420 static const unsigned long nmk_pin_input_modes[] = {
1421 PIN_INPUT_NOPULL,
1422 PIN_INPUT_PULLUP,
1423 PIN_INPUT_PULLDOWN,
1424 };
1425
1426 static const unsigned long nmk_pin_output_modes[] = {
1427 PIN_OUTPUT_LOW,
1428 PIN_OUTPUT_HIGH,
1429 PIN_DIR_OUTPUT,
1430 };
1431
1432 static const unsigned long nmk_pin_sleep_modes[] = {
1433 PIN_SLEEPMODE_DISABLED,
1434 PIN_SLEEPMODE_ENABLED,
1435 };
1436
1437 static const unsigned long nmk_pin_sleep_input_modes[] = {
1438 PIN_SLPM_INPUT_NOPULL,
1439 PIN_SLPM_INPUT_PULLUP,
1440 PIN_SLPM_INPUT_PULLDOWN,
1441 PIN_SLPM_DIR_INPUT,
1442 };
1443
1444 static const unsigned long nmk_pin_sleep_output_modes[] = {
1445 PIN_SLPM_OUTPUT_LOW,
1446 PIN_SLPM_OUTPUT_HIGH,
1447 PIN_SLPM_DIR_OUTPUT,
1448 };
1449
1450 static const unsigned long nmk_pin_sleep_wakeup_modes[] = {
1451 PIN_SLPM_WAKEUP_DISABLE,
1452 PIN_SLPM_WAKEUP_ENABLE,
1453 };
1454
1455 static const unsigned long nmk_pin_gpio_modes[] = {
1456 PIN_GPIOMODE_DISABLED,
1457 PIN_GPIOMODE_ENABLED,
1458 };
1459
1460 static const unsigned long nmk_pin_sleep_pdis_modes[] = {
1461 PIN_SLPM_PDIS_DISABLED,
1462 PIN_SLPM_PDIS_ENABLED,
1463 };
1464
1465 struct nmk_cfg_param {
1466 const char *property;
1467 unsigned long config;
1468 const unsigned long *choice;
1469 int size;
1470 };
1471
1472 static const struct nmk_cfg_param nmk_cfg_params[] = {
1473 NMK_CONFIG_PIN_ARRAY("ste,input", nmk_pin_input_modes),
1474 NMK_CONFIG_PIN_ARRAY("ste,output", nmk_pin_output_modes),
1475 NMK_CONFIG_PIN_ARRAY("ste,sleep", nmk_pin_sleep_modes),
1476 NMK_CONFIG_PIN_ARRAY("ste,sleep-input", nmk_pin_sleep_input_modes),
1477 NMK_CONFIG_PIN_ARRAY("ste,sleep-output", nmk_pin_sleep_output_modes),
1478 NMK_CONFIG_PIN_ARRAY("ste,sleep-wakeup", nmk_pin_sleep_wakeup_modes),
1479 NMK_CONFIG_PIN_ARRAY("ste,gpio", nmk_pin_gpio_modes),
1480 NMK_CONFIG_PIN_ARRAY("ste,sleep-pull-disable", nmk_pin_sleep_pdis_modes),
1481 };
1482
1483 static int nmk_dt_pin_config(int index, int val, unsigned long *config)
1484 {
1485 int ret = 0;
1486
1487 if (nmk_cfg_params[index].choice == NULL)
1488 *config = nmk_cfg_params[index].config;
1489 else {
1490 /* test if out of range */
1491 if (val < nmk_cfg_params[index].size) {
1492 *config = nmk_cfg_params[index].config |
1493 nmk_cfg_params[index].choice[val];
1494 }
1495 }
1496 return ret;
1497 }
1498
1499 static const char *nmk_find_pin_name(struct pinctrl_dev *pctldev, const char *pin_name)
1500 {
1501 int i, pin_number;
1502 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1503
1504 if (sscanf((char *)pin_name, "GPIO%d", &pin_number) == 1)
1505 for (i = 0; i < npct->soc->npins; i++)
1506 if (npct->soc->pins[i].number == pin_number)
1507 return npct->soc->pins[i].name;
1508 return NULL;
1509 }
1510
1511 static bool nmk_pinctrl_dt_get_config(struct device_node *np,
1512 unsigned long *configs)
1513 {
1514 bool has_config = 0;
1515 unsigned long cfg = 0;
1516 int i, val, ret;
1517
1518 for (i = 0; i < ARRAY_SIZE(nmk_cfg_params); i++) {
1519 ret = of_property_read_u32(np,
1520 nmk_cfg_params[i].property, &val);
1521 if (ret != -EINVAL) {
1522 if (nmk_dt_pin_config(i, val, &cfg) == 0) {
1523 *configs |= cfg;
1524 has_config = 1;
1525 }
1526 }
1527 }
1528
1529 return has_config;
1530 }
1531
1532 static int nmk_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
1533 struct device_node *np,
1534 struct pinctrl_map **map,
1535 unsigned *reserved_maps,
1536 unsigned *num_maps)
1537 {
1538 int ret;
1539 const char *function = NULL;
1540 unsigned long configs = 0;
1541 bool has_config = 0;
1542 struct property *prop;
1543 struct device_node *np_config;
1544
1545 ret = of_property_read_string(np, "function", &function);
1546 if (ret >= 0) {
1547 const char *group;
1548
1549 ret = of_property_count_strings(np, "groups");
1550 if (ret < 0)
1551 goto exit;
1552
1553 ret = pinctrl_utils_reserve_map(pctldev, map,
1554 reserved_maps,
1555 num_maps, ret);
1556 if (ret < 0)
1557 goto exit;
1558
1559 of_property_for_each_string(np, "groups", prop, group) {
1560 ret = nmk_dt_add_map_mux(map, reserved_maps, num_maps,
1561 group, function);
1562 if (ret < 0)
1563 goto exit;
1564 }
1565 }
1566
1567 has_config = nmk_pinctrl_dt_get_config(np, &configs);
1568 np_config = of_parse_phandle(np, "ste,config", 0);
1569 if (np_config)
1570 has_config |= nmk_pinctrl_dt_get_config(np_config, &configs);
1571 if (has_config) {
1572 const char *gpio_name;
1573 const char *pin;
1574
1575 ret = of_property_count_strings(np, "pins");
1576 if (ret < 0)
1577 goto exit;
1578 ret = pinctrl_utils_reserve_map(pctldev, map,
1579 reserved_maps,
1580 num_maps, ret);
1581 if (ret < 0)
1582 goto exit;
1583
1584 of_property_for_each_string(np, "pins", prop, pin) {
1585 gpio_name = nmk_find_pin_name(pctldev, pin);
1586
1587 ret = nmk_dt_add_map_configs(map, reserved_maps,
1588 num_maps,
1589 gpio_name, &configs, 1);
1590 if (ret < 0)
1591 goto exit;
1592 }
1593 }
1594
1595 exit:
1596 return ret;
1597 }
1598
1599 static int nmk_pinctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
1600 struct device_node *np_config,
1601 struct pinctrl_map **map, unsigned *num_maps)
1602 {
1603 unsigned reserved_maps;
1604 struct device_node *np;
1605 int ret;
1606
1607 reserved_maps = 0;
1608 *map = NULL;
1609 *num_maps = 0;
1610
1611 for_each_child_of_node(np_config, np) {
1612 ret = nmk_pinctrl_dt_subnode_to_map(pctldev, np, map,
1613 &reserved_maps, num_maps);
1614 if (ret < 0) {
1615 pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
1616 return ret;
1617 }
1618 }
1619
1620 return 0;
1621 }
1622
1623 static const struct pinctrl_ops nmk_pinctrl_ops = {
1624 .get_groups_count = nmk_get_groups_cnt,
1625 .get_group_name = nmk_get_group_name,
1626 .get_group_pins = nmk_get_group_pins,
1627 .pin_dbg_show = nmk_pin_dbg_show,
1628 .dt_node_to_map = nmk_pinctrl_dt_node_to_map,
1629 .dt_free_map = pinctrl_utils_dt_free_map,
1630 };
1631
1632 static int nmk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
1633 {
1634 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1635
1636 return npct->soc->nfunctions;
1637 }
1638
1639 static const char *nmk_pmx_get_func_name(struct pinctrl_dev *pctldev,
1640 unsigned function)
1641 {
1642 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1643
1644 return npct->soc->functions[function].name;
1645 }
1646
1647 static int nmk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
1648 unsigned function,
1649 const char * const **groups,
1650 unsigned * const num_groups)
1651 {
1652 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1653
1654 *groups = npct->soc->functions[function].groups;
1655 *num_groups = npct->soc->functions[function].ngroups;
1656
1657 return 0;
1658 }
1659
1660 static int nmk_pmx_set(struct pinctrl_dev *pctldev, unsigned function,
1661 unsigned group)
1662 {
1663 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1664 const struct nmk_pingroup *g;
1665 static unsigned int slpm[NUM_BANKS];
1666 unsigned long flags = 0;
1667 bool glitch;
1668 int ret = -EINVAL;
1669 int i;
1670
1671 g = &npct->soc->groups[group];
1672
1673 if (g->altsetting < 0)
1674 return -EINVAL;
1675
1676 dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins);
1677
1678 /*
1679 * If we're setting altfunc C by setting both AFSLA and AFSLB to 1,
1680 * we may pass through an undesired state. In this case we take
1681 * some extra care.
1682 *
1683 * Safe sequence used to switch IOs between GPIO and Alternate-C mode:
1684 * - Save SLPM registers (since we have a shadow register in the
1685 * nmk_chip we're using that as backup)
1686 * - Set SLPM=0 for the IOs you want to switch and others to 1
1687 * - Configure the GPIO registers for the IOs that are being switched
1688 * - Set IOFORCE=1
1689 * - Modify the AFLSA/B registers for the IOs that are being switched
1690 * - Set IOFORCE=0
1691 * - Restore SLPM registers
1692 * - Any spurious wake up event during switch sequence to be ignored
1693 * and cleared
1694 *
1695 * We REALLY need to save ALL slpm registers, because the external
1696 * IOFORCE will switch *all* ports to their sleepmode setting to as
1697 * to avoid glitches. (Not just one port!)
1698 */
1699 glitch = ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C);
1700
1701 if (glitch) {
1702 spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
1703
1704 /* Initially don't put any pins to sleep when switching */
1705 memset(slpm, 0xff, sizeof(slpm));
1706
1707 /*
1708 * Then mask the pins that need to be sleeping now when we're
1709 * switching to the ALT C function.
1710 */
1711 for (i = 0; i < g->npins; i++)
1712 slpm[g->pins[i] / NMK_GPIO_PER_CHIP] &= ~BIT(g->pins[i]);
1713 nmk_gpio_glitch_slpm_init(slpm);
1714 }
1715
1716 for (i = 0; i < g->npins; i++) {
1717 struct nmk_gpio_chip *nmk_chip;
1718 unsigned bit;
1719
1720 nmk_chip = find_nmk_gpio_from_pin(g->pins[i]);
1721 if (!nmk_chip) {
1722 dev_err(npct->dev,
1723 "invalid pin offset %d in group %s at index %d\n",
1724 g->pins[i], g->name, i);
1725 goto out_glitch;
1726 }
1727 dev_dbg(npct->dev, "setting pin %d to altsetting %d\n", g->pins[i], g->altsetting);
1728
1729 clk_enable(nmk_chip->clk);
1730 bit = g->pins[i] % NMK_GPIO_PER_CHIP;
1731 /*
1732 * If the pin is switching to altfunc, and there was an
1733 * interrupt installed on it which has been lazy disabled,
1734 * actually mask the interrupt to prevent spurious interrupts
1735 * that would occur while the pin is under control of the
1736 * peripheral. Only SKE does this.
1737 */
1738 nmk_gpio_disable_lazy_irq(nmk_chip, bit);
1739
1740 __nmk_gpio_set_mode_safe(nmk_chip, bit,
1741 (g->altsetting & NMK_GPIO_ALT_C), glitch);
1742 clk_disable(nmk_chip->clk);
1743
1744 /*
1745 * Call PRCM GPIOCR config function in case ALTC
1746 * has been selected:
1747 * - If selection is a ALTCx, some bits in PRCM GPIOCR registers
1748 * must be set.
1749 * - If selection is pure ALTC and previous selection was ALTCx,
1750 * then some bits in PRCM GPIOCR registers must be cleared.
1751 */
1752 if ((g->altsetting & NMK_GPIO_ALT_C) == NMK_GPIO_ALT_C)
1753 nmk_prcm_altcx_set_mode(npct, g->pins[i],
1754 g->altsetting >> NMK_GPIO_ALT_CX_SHIFT);
1755 }
1756
1757 /* When all pins are successfully reconfigured we get here */
1758 ret = 0;
1759
1760 out_glitch:
1761 if (glitch) {
1762 nmk_gpio_glitch_slpm_restore(slpm);
1763 spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
1764 }
1765
1766 return ret;
1767 }
1768
1769 static int nmk_gpio_request_enable(struct pinctrl_dev *pctldev,
1770 struct pinctrl_gpio_range *range,
1771 unsigned offset)
1772 {
1773 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1774 struct nmk_gpio_chip *nmk_chip;
1775 struct gpio_chip *chip;
1776 unsigned bit;
1777
1778 if (!range) {
1779 dev_err(npct->dev, "invalid range\n");
1780 return -EINVAL;
1781 }
1782 if (!range->gc) {
1783 dev_err(npct->dev, "missing GPIO chip in range\n");
1784 return -EINVAL;
1785 }
1786 chip = range->gc;
1787 nmk_chip = gpiochip_get_data(chip);
1788
1789 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
1790
1791 clk_enable(nmk_chip->clk);
1792 bit = offset % NMK_GPIO_PER_CHIP;
1793 /* There is no glitch when converting any pin to GPIO */
1794 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1795 clk_disable(nmk_chip->clk);
1796
1797 return 0;
1798 }
1799
1800 static void nmk_gpio_disable_free(struct pinctrl_dev *pctldev,
1801 struct pinctrl_gpio_range *range,
1802 unsigned offset)
1803 {
1804 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1805
1806 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
1807 /* Set the pin to some default state, GPIO is usually default */
1808 }
1809
1810 static const struct pinmux_ops nmk_pinmux_ops = {
1811 .get_functions_count = nmk_pmx_get_funcs_cnt,
1812 .get_function_name = nmk_pmx_get_func_name,
1813 .get_function_groups = nmk_pmx_get_func_groups,
1814 .set_mux = nmk_pmx_set,
1815 .gpio_request_enable = nmk_gpio_request_enable,
1816 .gpio_disable_free = nmk_gpio_disable_free,
1817 .strict = true,
1818 };
1819
1820 static int nmk_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,
1821 unsigned long *config)
1822 {
1823 /* Not implemented */
1824 return -EINVAL;
1825 }
1826
1827 static int nmk_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,
1828 unsigned long *configs, unsigned num_configs)
1829 {
1830 static const char *pullnames[] = {
1831 [NMK_GPIO_PULL_NONE] = "none",
1832 [NMK_GPIO_PULL_UP] = "up",
1833 [NMK_GPIO_PULL_DOWN] = "down",
1834 [3] /* illegal */ = "??"
1835 };
1836 static const char *slpmnames[] = {
1837 [NMK_GPIO_SLPM_INPUT] = "input/wakeup",
1838 [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup",
1839 };
1840 struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
1841 struct nmk_gpio_chip *nmk_chip;
1842 unsigned bit;
1843 pin_cfg_t cfg;
1844 int pull, slpm, output, val, i;
1845 bool lowemi, gpiomode, sleep;
1846
1847 nmk_chip = find_nmk_gpio_from_pin(pin);
1848 if (!nmk_chip) {
1849 dev_err(npct->dev,
1850 "invalid pin offset %d\n", pin);
1851 return -EINVAL;
1852 }
1853
1854 for (i = 0; i < num_configs; i++) {
1855 /*
1856 * The pin config contains pin number and altfunction fields,
1857 * here we just ignore that part. It's being handled by the
1858 * framework and pinmux callback respectively.
1859 */
1860 cfg = (pin_cfg_t) configs[i];
1861 pull = PIN_PULL(cfg);
1862 slpm = PIN_SLPM(cfg);
1863 output = PIN_DIR(cfg);
1864 val = PIN_VAL(cfg);
1865 lowemi = PIN_LOWEMI(cfg);
1866 gpiomode = PIN_GPIOMODE(cfg);
1867 sleep = PIN_SLEEPMODE(cfg);
1868
1869 if (sleep) {
1870 int slpm_pull = PIN_SLPM_PULL(cfg);
1871 int slpm_output = PIN_SLPM_DIR(cfg);
1872 int slpm_val = PIN_SLPM_VAL(cfg);
1873
1874 /* All pins go into GPIO mode at sleep */
1875 gpiomode = true;
1876
1877 /*
1878 * The SLPM_* values are normal values + 1 to allow zero
1879 * to mean "same as normal".
1880 */
1881 if (slpm_pull)
1882 pull = slpm_pull - 1;
1883 if (slpm_output)
1884 output = slpm_output - 1;
1885 if (slpm_val)
1886 val = slpm_val - 1;
1887
1888 dev_dbg(nmk_chip->chip.parent,
1889 "pin %d: sleep pull %s, dir %s, val %s\n",
1890 pin,
1891 slpm_pull ? pullnames[pull] : "same",
1892 slpm_output ? (output ? "output" : "input")
1893 : "same",
1894 slpm_val ? (val ? "high" : "low") : "same");
1895 }
1896
1897 dev_dbg(nmk_chip->chip.parent,
1898 "pin %d [%#lx]: pull %s, slpm %s (%s%s), lowemi %s\n",
1899 pin, cfg, pullnames[pull], slpmnames[slpm],
1900 output ? "output " : "input",
1901 output ? (val ? "high" : "low") : "",
1902 lowemi ? "on" : "off");
1903
1904 clk_enable(nmk_chip->clk);
1905 bit = pin % NMK_GPIO_PER_CHIP;
1906 if (gpiomode)
1907 /* No glitch when going to GPIO mode */
1908 __nmk_gpio_set_mode(nmk_chip, bit, NMK_GPIO_ALT_GPIO);
1909 if (output)
1910 __nmk_gpio_make_output(nmk_chip, bit, val);
1911 else {
1912 __nmk_gpio_make_input(nmk_chip, bit);
1913 __nmk_gpio_set_pull(nmk_chip, bit, pull);
1914 }
1915 /* TODO: isn't this only applicable on output pins? */
1916 __nmk_gpio_set_lowemi(nmk_chip, bit, lowemi);
1917
1918 __nmk_gpio_set_slpm(nmk_chip, bit, slpm);
1919 clk_disable(nmk_chip->clk);
1920 } /* for each config */
1921
1922 return 0;
1923 }
1924
1925 static const struct pinconf_ops nmk_pinconf_ops = {
1926 .pin_config_get = nmk_pin_config_get,
1927 .pin_config_set = nmk_pin_config_set,
1928 };
1929
1930 static struct pinctrl_desc nmk_pinctrl_desc = {
1931 .name = "pinctrl-nomadik",
1932 .pctlops = &nmk_pinctrl_ops,
1933 .pmxops = &nmk_pinmux_ops,
1934 .confops = &nmk_pinconf_ops,
1935 .owner = THIS_MODULE,
1936 };
1937
1938 static const struct of_device_id nmk_pinctrl_match[] = {
1939 {
1940 .compatible = "stericsson,stn8815-pinctrl",
1941 .data = (void *)PINCTRL_NMK_STN8815,
1942 },
1943 {
1944 .compatible = "stericsson,db8500-pinctrl",
1945 .data = (void *)PINCTRL_NMK_DB8500,
1946 },
1947 {
1948 .compatible = "stericsson,db8540-pinctrl",
1949 .data = (void *)PINCTRL_NMK_DB8540,
1950 },
1951 {},
1952 };
1953
1954 #ifdef CONFIG_PM_SLEEP
1955 static int nmk_pinctrl_suspend(struct device *dev)
1956 {
1957 struct nmk_pinctrl *npct;
1958
1959 npct = dev_get_drvdata(dev);
1960 if (!npct)
1961 return -EINVAL;
1962
1963 return pinctrl_force_sleep(npct->pctl);
1964 }
1965
1966 static int nmk_pinctrl_resume(struct device *dev)
1967 {
1968 struct nmk_pinctrl *npct;
1969
1970 npct = dev_get_drvdata(dev);
1971 if (!npct)
1972 return -EINVAL;
1973
1974 return pinctrl_force_default(npct->pctl);
1975 }
1976 #endif
1977
1978 static int nmk_pinctrl_probe(struct platform_device *pdev)
1979 {
1980 const struct of_device_id *match;
1981 struct device_node *np = pdev->dev.of_node;
1982 struct device_node *prcm_np;
1983 struct nmk_pinctrl *npct;
1984 unsigned int version = 0;
1985 int i;
1986
1987 npct = devm_kzalloc(&pdev->dev, sizeof(*npct), GFP_KERNEL);
1988 if (!npct)
1989 return -ENOMEM;
1990
1991 match = of_match_device(nmk_pinctrl_match, &pdev->dev);
1992 if (!match)
1993 return -ENODEV;
1994 version = (unsigned int) match->data;
1995
1996 /* Poke in other ASIC variants here */
1997 if (version == PINCTRL_NMK_STN8815)
1998 nmk_pinctrl_stn8815_init(&npct->soc);
1999 if (version == PINCTRL_NMK_DB8500)
2000 nmk_pinctrl_db8500_init(&npct->soc);
2001 if (version == PINCTRL_NMK_DB8540)
2002 nmk_pinctrl_db8540_init(&npct->soc);
2003
2004 /*
2005 * Since we depend on the GPIO chips to provide clock and register base
2006 * for the pin control operations, make sure that we have these
2007 * populated before we continue. Follow the phandles to instantiate
2008 * them. The GPIO portion of the actual hardware may be probed before
2009 * or after this point: it shouldn't matter as the APIs are orthogonal.
2010 */
2011 for (i = 0; i < NMK_MAX_BANKS; i++) {
2012 struct device_node *gpio_np;
2013 struct nmk_gpio_chip *nmk_chip;
2014
2015 gpio_np = of_parse_phandle(np, "nomadik-gpio-chips", i);
2016 if (gpio_np) {
2017 dev_info(&pdev->dev,
2018 "populate NMK GPIO %d \"%s\"\n",
2019 i, gpio_np->name);
2020 nmk_chip = nmk_gpio_populate_chip(gpio_np, pdev);
2021 if (IS_ERR(nmk_chip))
2022 dev_err(&pdev->dev,
2023 "could not populate nmk chip struct "
2024 "- continue anyway\n");
2025 of_node_put(gpio_np);
2026 }
2027 }
2028
2029 prcm_np = of_parse_phandle(np, "prcm", 0);
2030 if (prcm_np)
2031 npct->prcm_base = of_iomap(prcm_np, 0);
2032 if (!npct->prcm_base) {
2033 if (version == PINCTRL_NMK_STN8815) {
2034 dev_info(&pdev->dev,
2035 "No PRCM base, "
2036 "assuming no ALT-Cx control is available\n");
2037 } else {
2038 dev_err(&pdev->dev, "missing PRCM base address\n");
2039 return -EINVAL;
2040 }
2041 }
2042
2043 nmk_pinctrl_desc.pins = npct->soc->pins;
2044 nmk_pinctrl_desc.npins = npct->soc->npins;
2045 npct->dev = &pdev->dev;
2046
2047 npct->pctl = pinctrl_register(&nmk_pinctrl_desc, &pdev->dev, npct);
2048 if (IS_ERR(npct->pctl)) {
2049 dev_err(&pdev->dev, "could not register Nomadik pinctrl driver\n");
2050 return PTR_ERR(npct->pctl);
2051 }
2052
2053 platform_set_drvdata(pdev, npct);
2054 dev_info(&pdev->dev, "initialized Nomadik pin control driver\n");
2055
2056 return 0;
2057 }
2058
2059 static const struct of_device_id nmk_gpio_match[] = {
2060 { .compatible = "st,nomadik-gpio", },
2061 {}
2062 };
2063
2064 static struct platform_driver nmk_gpio_driver = {
2065 .driver = {
2066 .name = "gpio",
2067 .of_match_table = nmk_gpio_match,
2068 },
2069 .probe = nmk_gpio_probe,
2070 };
2071
2072 static SIMPLE_DEV_PM_OPS(nmk_pinctrl_pm_ops,
2073 nmk_pinctrl_suspend,
2074 nmk_pinctrl_resume);
2075
2076 static struct platform_driver nmk_pinctrl_driver = {
2077 .driver = {
2078 .name = "pinctrl-nomadik",
2079 .of_match_table = nmk_pinctrl_match,
2080 .pm = &nmk_pinctrl_pm_ops,
2081 },
2082 .probe = nmk_pinctrl_probe,
2083 };
2084
2085 static int __init nmk_gpio_init(void)
2086 {
2087 return platform_driver_register(&nmk_gpio_driver);
2088 }
2089 subsys_initcall(nmk_gpio_init);
2090
2091 static int __init nmk_pinctrl_init(void)
2092 {
2093 return platform_driver_register(&nmk_pinctrl_driver);
2094 }
2095 core_initcall(nmk_pinctrl_init);
2096
2097 MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
2098 MODULE_DESCRIPTION("Nomadik GPIO Driver");
2099 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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