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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-at91.c
blob207f266e9cf2c2f5a692809d907279813b33346b
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * at91 pinctrl driver based on at91 pinmux core
4 *
5 * Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
6 */
7
8 #include <linux/clk.h>
9 #include <linux/err.h>
10 #include <linux/init.h>
11 #include <linux/of.h>
12 #include <linux/of_device.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/slab.h>
16 #include <linux/interrupt.h>
17 #include <linux/io.h>
18 #include <linux/gpio/driver.h>
19 #include <linux/pinctrl/machine.h>
20 #include <linux/pinctrl/pinconf.h>
21 #include <linux/pinctrl/pinctrl.h>
22 #include <linux/pinctrl/pinmux.h>
23 /* Since we request GPIOs from ourself */
24 #include <linux/pinctrl/consumer.h>
25
26 #include "pinctrl-at91.h"
27 #include "core.h"
28
29 #define MAX_GPIO_BANKS 5
30 #define MAX_NB_GPIO_PER_BANK 32
31
32 struct at91_pinctrl_mux_ops;
33
34 struct at91_gpio_chip {
35 struct gpio_chip chip;
36 struct pinctrl_gpio_range range;
37 struct at91_gpio_chip *next; /* Bank sharing same clock */
38 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
39 int pioc_virq; /* PIO bank Linux virtual interrupt */
40 int pioc_idx; /* PIO bank index */
41 void __iomem *regbase; /* PIO bank virtual address */
42 struct clk *clock; /* associated clock */
43 struct at91_pinctrl_mux_ops *ops; /* ops */
44 };
45
46 static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
47
48 static int gpio_banks;
49
50 #define PULL_UP (1 << 0)
51 #define MULTI_DRIVE (1 << 1)
52 #define DEGLITCH (1 << 2)
53 #define PULL_DOWN (1 << 3)
54 #define DIS_SCHMIT (1 << 4)
55 #define DRIVE_STRENGTH_SHIFT 5
56 #define DRIVE_STRENGTH_MASK 0x3
57 #define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT)
58 #define OUTPUT (1 << 7)
59 #define OUTPUT_VAL_SHIFT 8
60 #define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT)
61 #define SLEWRATE_SHIFT 9
62 #define SLEWRATE_MASK 0x1
63 #define SLEWRATE (SLEWRATE_MASK << SLEWRATE_SHIFT)
64 #define DEBOUNCE (1 << 16)
65 #define DEBOUNCE_VAL_SHIFT 17
66 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
67
68 /**
69 * These defines will translated the dt binding settings to our internal
70 * settings. They are not necessarily the same value as the register setting.
71 * The actual drive strength current of low, medium and high must be looked up
72 * from the corresponding device datasheet. This value is different for pins
73 * that are even in the same banks. It is also dependent on VCC.
74 * DRIVE_STRENGTH_DEFAULT is just a placeholder to avoid changing the drive
75 * strength when there is no dt config for it.
76 */
77 enum drive_strength_bit {
78 DRIVE_STRENGTH_BIT_DEF,
79 DRIVE_STRENGTH_BIT_LOW,
80 DRIVE_STRENGTH_BIT_MED,
81 DRIVE_STRENGTH_BIT_HI,
82 };
83
84 #define DRIVE_STRENGTH_BIT_MSK(name) (DRIVE_STRENGTH_BIT_##name << \
85 DRIVE_STRENGTH_SHIFT)
86
87 enum slewrate_bit {
88 SLEWRATE_BIT_ENA,
89 SLEWRATE_BIT_DIS,
90 };
91
92 #define SLEWRATE_BIT_MSK(name) (SLEWRATE_BIT_##name << SLEWRATE_SHIFT)
93
94 /**
95 * struct at91_pmx_func - describes AT91 pinmux functions
96 * @name: the name of this specific function
97 * @groups: corresponding pin groups
98 * @ngroups: the number of groups
99 */
100 struct at91_pmx_func {
101 const char *name;
102 const char **groups;
103 unsigned ngroups;
104 };
105
106 enum at91_mux {
107 AT91_MUX_GPIO = 0,
108 AT91_MUX_PERIPH_A = 1,
109 AT91_MUX_PERIPH_B = 2,
110 AT91_MUX_PERIPH_C = 3,
111 AT91_MUX_PERIPH_D = 4,
112 };
113
114 /**
115 * struct at91_pmx_pin - describes an At91 pin mux
116 * @bank: the bank of the pin
117 * @pin: the pin number in the @bank
118 * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
119 * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
120 */
121 struct at91_pmx_pin {
122 uint32_t bank;
123 uint32_t pin;
124 enum at91_mux mux;
125 unsigned long conf;
126 };
127
128 /**
129 * struct at91_pin_group - describes an At91 pin group
130 * @name: the name of this specific pin group
131 * @pins_conf: the mux mode for each pin in this group. The size of this
132 * array is the same as pins.
133 * @pins: an array of discrete physical pins used in this group, taken
134 * from the driver-local pin enumeration space
135 * @npins: the number of pins in this group array, i.e. the number of
136 * elements in .pins so we can iterate over that array
137 */
138 struct at91_pin_group {
139 const char *name;
140 struct at91_pmx_pin *pins_conf;
141 unsigned int *pins;
142 unsigned npins;
143 };
144
145 /**
146 * struct at91_pinctrl_mux_ops - describes an AT91 mux ops group
147 * on new IP with support for periph C and D the way to mux in
148 * periph A and B has changed
149 * So provide the right call back
150 * if not present means the IP does not support it
151 * @get_periph: return the periph mode configured
152 * @mux_A_periph: mux as periph A
153 * @mux_B_periph: mux as periph B
154 * @mux_C_periph: mux as periph C
155 * @mux_D_periph: mux as periph D
156 * @get_deglitch: get deglitch status
157 * @set_deglitch: enable/disable deglitch
158 * @get_debounce: get debounce status
159 * @set_debounce: enable/disable debounce
160 * @get_pulldown: get pulldown status
161 * @set_pulldown: enable/disable pulldown
162 * @get_schmitt_trig: get schmitt trigger status
163 * @disable_schmitt_trig: disable schmitt trigger
164 * @irq_type: return irq type
165 */
166 struct at91_pinctrl_mux_ops {
167 enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
168 void (*mux_A_periph)(void __iomem *pio, unsigned mask);
169 void (*mux_B_periph)(void __iomem *pio, unsigned mask);
170 void (*mux_C_periph)(void __iomem *pio, unsigned mask);
171 void (*mux_D_periph)(void __iomem *pio, unsigned mask);
172 bool (*get_deglitch)(void __iomem *pio, unsigned pin);
173 void (*set_deglitch)(void __iomem *pio, unsigned mask, bool is_on);
174 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
175 void (*set_debounce)(void __iomem *pio, unsigned mask, bool is_on, u32 div);
176 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
177 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool is_on);
178 bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
179 void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
180 unsigned (*get_drivestrength)(void __iomem *pio, unsigned pin);
181 void (*set_drivestrength)(void __iomem *pio, unsigned pin,
182 u32 strength);
183 unsigned (*get_slewrate)(void __iomem *pio, unsigned pin);
184 void (*set_slewrate)(void __iomem *pio, unsigned pin, u32 slewrate);
185 /* irq */
186 int (*irq_type)(struct irq_data *d, unsigned type);
187 };
188
189 static int gpio_irq_type(struct irq_data *d, unsigned type);
190 static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
191
192 struct at91_pinctrl {
193 struct device *dev;
194 struct pinctrl_dev *pctl;
195
196 int nactive_banks;
197
198 uint32_t *mux_mask;
199 int nmux;
200
201 struct at91_pmx_func *functions;
202 int nfunctions;
203
204 struct at91_pin_group *groups;
205 int ngroups;
206
207 struct at91_pinctrl_mux_ops *ops;
208 };
209
210 static inline const struct at91_pin_group *at91_pinctrl_find_group_by_name(
211 const struct at91_pinctrl *info,
212 const char *name)
213 {
214 const struct at91_pin_group *grp = NULL;
215 int i;
216
217 for (i = 0; i < info->ngroups; i++) {
218 if (strcmp(info->groups[i].name, name))
219 continue;
220
221 grp = &info->groups[i];
222 dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
223 break;
224 }
225
226 return grp;
227 }
228
229 static int at91_get_groups_count(struct pinctrl_dev *pctldev)
230 {
231 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
232
233 return info->ngroups;
234 }
235
236 static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
237 unsigned selector)
238 {
239 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
240
241 return info->groups[selector].name;
242 }
243
244 static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
245 const unsigned **pins,
246 unsigned *npins)
247 {
248 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
249
250 if (selector >= info->ngroups)
251 return -EINVAL;
252
253 *pins = info->groups[selector].pins;
254 *npins = info->groups[selector].npins;
255
256 return 0;
257 }
258
259 static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
260 unsigned offset)
261 {
262 seq_printf(s, "%s", dev_name(pctldev->dev));
263 }
264
265 static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
266 struct device_node *np,
267 struct pinctrl_map **map, unsigned *num_maps)
268 {
269 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
270 const struct at91_pin_group *grp;
271 struct pinctrl_map *new_map;
272 struct device_node *parent;
273 int map_num = 1;
274 int i;
275
276 /*
277 * first find the group of this node and check if we need to create
278 * config maps for pins
279 */
280 grp = at91_pinctrl_find_group_by_name(info, np->name);
281 if (!grp) {
282 dev_err(info->dev, "unable to find group for node %pOFn\n",
283 np);
284 return -EINVAL;
285 }
286
287 map_num += grp->npins;
288 new_map = devm_kcalloc(pctldev->dev, map_num, sizeof(*new_map),
289 GFP_KERNEL);
290 if (!new_map)
291 return -ENOMEM;
292
293 *map = new_map;
294 *num_maps = map_num;
295
296 /* create mux map */
297 parent = of_get_parent(np);
298 if (!parent) {
299 devm_kfree(pctldev->dev, new_map);
300 return -EINVAL;
301 }
302 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
303 new_map[0].data.mux.function = parent->name;
304 new_map[0].data.mux.group = np->name;
305 of_node_put(parent);
306
307 /* create config map */
308 new_map++;
309 for (i = 0; i < grp->npins; i++) {
310 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
311 new_map[i].data.configs.group_or_pin =
312 pin_get_name(pctldev, grp->pins[i]);
313 new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
314 new_map[i].data.configs.num_configs = 1;
315 }
316
317 dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
318 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
319
320 return 0;
321 }
322
323 static void at91_dt_free_map(struct pinctrl_dev *pctldev,
324 struct pinctrl_map *map, unsigned num_maps)
325 {
326 }
327
328 static const struct pinctrl_ops at91_pctrl_ops = {
329 .get_groups_count = at91_get_groups_count,
330 .get_group_name = at91_get_group_name,
331 .get_group_pins = at91_get_group_pins,
332 .pin_dbg_show = at91_pin_dbg_show,
333 .dt_node_to_map = at91_dt_node_to_map,
334 .dt_free_map = at91_dt_free_map,
335 };
336
337 static void __iomem *pin_to_controller(struct at91_pinctrl *info,
338 unsigned int bank)
339 {
340 if (!gpio_chips[bank])
341 return NULL;
342
343 return gpio_chips[bank]->regbase;
344 }
345
346 static inline int pin_to_bank(unsigned pin)
347 {
348 return pin /= MAX_NB_GPIO_PER_BANK;
349 }
350
351 static unsigned pin_to_mask(unsigned int pin)
352 {
353 return 1 << pin;
354 }
355
356 static unsigned two_bit_pin_value_shift_amount(unsigned int pin)
357 {
358 /* return the shift value for a pin for "two bit" per pin registers,
359 * i.e. drive strength */
360 return 2*((pin >= MAX_NB_GPIO_PER_BANK/2)
361 ? pin - MAX_NB_GPIO_PER_BANK/2 : pin);
362 }
363
364 static unsigned sama5d3_get_drive_register(unsigned int pin)
365 {
366 /* drive strength is split between two registers
367 * with two bits per pin */
368 return (pin >= MAX_NB_GPIO_PER_BANK/2)
369 ? SAMA5D3_PIO_DRIVER2 : SAMA5D3_PIO_DRIVER1;
370 }
371
372 static unsigned at91sam9x5_get_drive_register(unsigned int pin)
373 {
374 /* drive strength is split between two registers
375 * with two bits per pin */
376 return (pin >= MAX_NB_GPIO_PER_BANK/2)
377 ? AT91SAM9X5_PIO_DRIVER2 : AT91SAM9X5_PIO_DRIVER1;
378 }
379
380 static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
381 {
382 writel_relaxed(mask, pio + PIO_IDR);
383 }
384
385 static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
386 {
387 return !((readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1);
388 }
389
390 static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
391 {
392 if (on)
393 writel_relaxed(mask, pio + PIO_PPDDR);
394
395 writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
396 }
397
398 static bool at91_mux_get_output(void __iomem *pio, unsigned int pin, bool *val)
399 {
400 *val = (readl_relaxed(pio + PIO_ODSR) >> pin) & 0x1;
401 return (readl_relaxed(pio + PIO_OSR) >> pin) & 0x1;
402 }
403
404 static void at91_mux_set_output(void __iomem *pio, unsigned int mask,
405 bool is_on, bool val)
406 {
407 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
408 writel_relaxed(mask, pio + (is_on ? PIO_OER : PIO_ODR));
409 }
410
411 static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
412 {
413 return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
414 }
415
416 static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
417 {
418 writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
419 }
420
421 static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
422 {
423 writel_relaxed(mask, pio + PIO_ASR);
424 }
425
426 static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
427 {
428 writel_relaxed(mask, pio + PIO_BSR);
429 }
430
431 static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
432 {
433
434 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
435 pio + PIO_ABCDSR1);
436 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
437 pio + PIO_ABCDSR2);
438 }
439
440 static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
441 {
442 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
443 pio + PIO_ABCDSR1);
444 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
445 pio + PIO_ABCDSR2);
446 }
447
448 static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
449 {
450 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
451 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
452 }
453
454 static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
455 {
456 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
457 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
458 }
459
460 static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
461 {
462 unsigned select;
463
464 if (readl_relaxed(pio + PIO_PSR) & mask)
465 return AT91_MUX_GPIO;
466
467 select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
468 select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
469
470 return select + 1;
471 }
472
473 static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
474 {
475 unsigned select;
476
477 if (readl_relaxed(pio + PIO_PSR) & mask)
478 return AT91_MUX_GPIO;
479
480 select = readl_relaxed(pio + PIO_ABSR) & mask;
481
482 return select + 1;
483 }
484
485 static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
486 {
487 return (readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1;
488 }
489
490 static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
491 {
492 writel_relaxed(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
493 }
494
495 static bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
496 {
497 if ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1)
498 return !((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
499
500 return false;
501 }
502
503 static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
504 {
505 if (is_on)
506 writel_relaxed(mask, pio + PIO_IFSCDR);
507 at91_mux_set_deglitch(pio, mask, is_on);
508 }
509
510 static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
511 {
512 *div = readl_relaxed(pio + PIO_SCDR);
513
514 return ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1) &&
515 ((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
516 }
517
518 static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
519 bool is_on, u32 div)
520 {
521 if (is_on) {
522 writel_relaxed(mask, pio + PIO_IFSCER);
523 writel_relaxed(div & PIO_SCDR_DIV, pio + PIO_SCDR);
524 writel_relaxed(mask, pio + PIO_IFER);
525 } else
526 writel_relaxed(mask, pio + PIO_IFSCDR);
527 }
528
529 static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
530 {
531 return !((readl_relaxed(pio + PIO_PPDSR) >> pin) & 0x1);
532 }
533
534 static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
535 {
536 if (is_on)
537 writel_relaxed(mask, pio + PIO_PUDR);
538
539 writel_relaxed(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
540 }
541
542 static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
543 {
544 writel_relaxed(readl_relaxed(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
545 }
546
547 static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
548 {
549 return (readl_relaxed(pio + PIO_SCHMITT) >> pin) & 0x1;
550 }
551
552 static inline u32 read_drive_strength(void __iomem *reg, unsigned pin)
553 {
554 unsigned tmp = readl_relaxed(reg);
555
556 tmp = tmp >> two_bit_pin_value_shift_amount(pin);
557
558 return tmp & DRIVE_STRENGTH_MASK;
559 }
560
561 static unsigned at91_mux_sama5d3_get_drivestrength(void __iomem *pio,
562 unsigned pin)
563 {
564 unsigned tmp = read_drive_strength(pio +
565 sama5d3_get_drive_register(pin), pin);
566
567 /* SAMA5 strength is 1:1 with our defines,
568 * except 0 is equivalent to low per datasheet */
569 if (!tmp)
570 tmp = DRIVE_STRENGTH_BIT_MSK(LOW);
571
572 return tmp;
573 }
574
575 static unsigned at91_mux_sam9x5_get_drivestrength(void __iomem *pio,
576 unsigned pin)
577 {
578 unsigned tmp = read_drive_strength(pio +
579 at91sam9x5_get_drive_register(pin), pin);
580
581 /* strength is inverse in SAM9x5s hardware with the pinctrl defines
582 * hardware: 0 = hi, 1 = med, 2 = low, 3 = rsvd */
583 tmp = DRIVE_STRENGTH_BIT_MSK(HI) - tmp;
584
585 return tmp;
586 }
587
588 static unsigned at91_mux_sam9x60_get_drivestrength(void __iomem *pio,
589 unsigned pin)
590 {
591 unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_DRIVER1);
592
593 if (tmp & BIT(pin))
594 return DRIVE_STRENGTH_BIT_HI;
595
596 return DRIVE_STRENGTH_BIT_LOW;
597 }
598
599 static unsigned at91_mux_sam9x60_get_slewrate(void __iomem *pio, unsigned pin)
600 {
601 unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR);
602
603 if ((tmp & BIT(pin)))
604 return SLEWRATE_BIT_ENA;
605
606 return SLEWRATE_BIT_DIS;
607 }
608
609 static void set_drive_strength(void __iomem *reg, unsigned pin, u32 strength)
610 {
611 unsigned tmp = readl_relaxed(reg);
612 unsigned shift = two_bit_pin_value_shift_amount(pin);
613
614 tmp &= ~(DRIVE_STRENGTH_MASK << shift);
615 tmp |= strength << shift;
616
617 writel_relaxed(tmp, reg);
618 }
619
620 static void at91_mux_sama5d3_set_drivestrength(void __iomem *pio, unsigned pin,
621 u32 setting)
622 {
623 /* do nothing if setting is zero */
624 if (!setting)
625 return;
626
627 /* strength is 1 to 1 with setting for SAMA5 */
628 set_drive_strength(pio + sama5d3_get_drive_register(pin), pin, setting);
629 }
630
631 static void at91_mux_sam9x5_set_drivestrength(void __iomem *pio, unsigned pin,
632 u32 setting)
633 {
634 /* do nothing if setting is zero */
635 if (!setting)
636 return;
637
638 /* strength is inverse on SAM9x5s with our defines
639 * 0 = hi, 1 = med, 2 = low, 3 = rsvd */
640 setting = DRIVE_STRENGTH_BIT_MSK(HI) - setting;
641
642 set_drive_strength(pio + at91sam9x5_get_drive_register(pin), pin,
643 setting);
644 }
645
646 static void at91_mux_sam9x60_set_drivestrength(void __iomem *pio, unsigned pin,
647 u32 setting)
648 {
649 unsigned int tmp;
650
651 if (setting <= DRIVE_STRENGTH_BIT_DEF ||
652 setting == DRIVE_STRENGTH_BIT_MED ||
653 setting > DRIVE_STRENGTH_BIT_HI)
654 return;
655
656 tmp = readl_relaxed(pio + SAM9X60_PIO_DRIVER1);
657
658 /* Strength is 0: low, 1: hi */
659 if (setting == DRIVE_STRENGTH_BIT_LOW)
660 tmp &= ~BIT(pin);
661 else
662 tmp |= BIT(pin);
663
664 writel_relaxed(tmp, pio + SAM9X60_PIO_DRIVER1);
665 }
666
667 static void at91_mux_sam9x60_set_slewrate(void __iomem *pio, unsigned pin,
668 u32 setting)
669 {
670 unsigned int tmp;
671
672 if (setting < SLEWRATE_BIT_ENA || setting > SLEWRATE_BIT_DIS)
673 return;
674
675 tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR);
676
677 if (setting == SLEWRATE_BIT_DIS)
678 tmp &= ~BIT(pin);
679 else
680 tmp |= BIT(pin);
681
682 writel_relaxed(tmp, pio + SAM9X60_PIO_SLEWR);
683 }
684
685 static struct at91_pinctrl_mux_ops at91rm9200_ops = {
686 .get_periph = at91_mux_get_periph,
687 .mux_A_periph = at91_mux_set_A_periph,
688 .mux_B_periph = at91_mux_set_B_periph,
689 .get_deglitch = at91_mux_get_deglitch,
690 .set_deglitch = at91_mux_set_deglitch,
691 .irq_type = gpio_irq_type,
692 };
693
694 static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
695 .get_periph = at91_mux_pio3_get_periph,
696 .mux_A_periph = at91_mux_pio3_set_A_periph,
697 .mux_B_periph = at91_mux_pio3_set_B_periph,
698 .mux_C_periph = at91_mux_pio3_set_C_periph,
699 .mux_D_periph = at91_mux_pio3_set_D_periph,
700 .get_deglitch = at91_mux_pio3_get_deglitch,
701 .set_deglitch = at91_mux_pio3_set_deglitch,
702 .get_debounce = at91_mux_pio3_get_debounce,
703 .set_debounce = at91_mux_pio3_set_debounce,
704 .get_pulldown = at91_mux_pio3_get_pulldown,
705 .set_pulldown = at91_mux_pio3_set_pulldown,
706 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
707 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
708 .get_drivestrength = at91_mux_sam9x5_get_drivestrength,
709 .set_drivestrength = at91_mux_sam9x5_set_drivestrength,
710 .irq_type = alt_gpio_irq_type,
711 };
712
713 static const struct at91_pinctrl_mux_ops sam9x60_ops = {
714 .get_periph = at91_mux_pio3_get_periph,
715 .mux_A_periph = at91_mux_pio3_set_A_periph,
716 .mux_B_periph = at91_mux_pio3_set_B_periph,
717 .mux_C_periph = at91_mux_pio3_set_C_periph,
718 .mux_D_periph = at91_mux_pio3_set_D_periph,
719 .get_deglitch = at91_mux_pio3_get_deglitch,
720 .set_deglitch = at91_mux_pio3_set_deglitch,
721 .get_debounce = at91_mux_pio3_get_debounce,
722 .set_debounce = at91_mux_pio3_set_debounce,
723 .get_pulldown = at91_mux_pio3_get_pulldown,
724 .set_pulldown = at91_mux_pio3_set_pulldown,
725 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
726 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
727 .get_drivestrength = at91_mux_sam9x60_get_drivestrength,
728 .set_drivestrength = at91_mux_sam9x60_set_drivestrength,
729 .get_slewrate = at91_mux_sam9x60_get_slewrate,
730 .set_slewrate = at91_mux_sam9x60_set_slewrate,
731 .irq_type = alt_gpio_irq_type,
732
733 };
734
735 static struct at91_pinctrl_mux_ops sama5d3_ops = {
736 .get_periph = at91_mux_pio3_get_periph,
737 .mux_A_periph = at91_mux_pio3_set_A_periph,
738 .mux_B_periph = at91_mux_pio3_set_B_periph,
739 .mux_C_periph = at91_mux_pio3_set_C_periph,
740 .mux_D_periph = at91_mux_pio3_set_D_periph,
741 .get_deglitch = at91_mux_pio3_get_deglitch,
742 .set_deglitch = at91_mux_pio3_set_deglitch,
743 .get_debounce = at91_mux_pio3_get_debounce,
744 .set_debounce = at91_mux_pio3_set_debounce,
745 .get_pulldown = at91_mux_pio3_get_pulldown,
746 .set_pulldown = at91_mux_pio3_set_pulldown,
747 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
748 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
749 .get_drivestrength = at91_mux_sama5d3_get_drivestrength,
750 .set_drivestrength = at91_mux_sama5d3_set_drivestrength,
751 .irq_type = alt_gpio_irq_type,
752 };
753
754 static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
755 {
756 if (pin->mux) {
757 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lx\n",
758 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
759 } else {
760 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lx\n",
761 pin->bank + 'A', pin->pin, pin->conf);
762 }
763 }
764
765 static int pin_check_config(struct at91_pinctrl *info, const char *name,
766 int index, const struct at91_pmx_pin *pin)
767 {
768 int mux;
769
770 /* check if it's a valid config */
771 if (pin->bank >= gpio_banks) {
772 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
773 name, index, pin->bank, gpio_banks);
774 return -EINVAL;
775 }
776
777 if (!gpio_chips[pin->bank]) {
778 dev_err(info->dev, "%s: pin conf %d bank_id %d not enabled\n",
779 name, index, pin->bank);
780 return -ENXIO;
781 }
782
783 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
784 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
785 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
786 return -EINVAL;
787 }
788
789 if (!pin->mux)
790 return 0;
791
792 mux = pin->mux - 1;
793
794 if (mux >= info->nmux) {
795 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
796 name, index, mux, info->nmux);
797 return -EINVAL;
798 }
799
800 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
801 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
802 name, index, mux, pin->bank + 'A', pin->pin);
803 return -EINVAL;
804 }
805
806 return 0;
807 }
808
809 static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
810 {
811 writel_relaxed(mask, pio + PIO_PDR);
812 }
813
814 static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
815 {
816 writel_relaxed(mask, pio + PIO_PER);
817 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
818 }
819
820 static int at91_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
821 unsigned group)
822 {
823 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
824 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
825 const struct at91_pmx_pin *pin;
826 uint32_t npins = info->groups[group].npins;
827 int i, ret;
828 unsigned mask;
829 void __iomem *pio;
830
831 dev_dbg(info->dev, "enable function %s group %s\n",
832 info->functions[selector].name, info->groups[group].name);
833
834 /* first check that all the pins of the group are valid with a valid
835 * parameter */
836 for (i = 0; i < npins; i++) {
837 pin = &pins_conf[i];
838 ret = pin_check_config(info, info->groups[group].name, i, pin);
839 if (ret)
840 return ret;
841 }
842
843 for (i = 0; i < npins; i++) {
844 pin = &pins_conf[i];
845 at91_pin_dbg(info->dev, pin);
846 pio = pin_to_controller(info, pin->bank);
847
848 if (!pio)
849 continue;
850
851 mask = pin_to_mask(pin->pin);
852 at91_mux_disable_interrupt(pio, mask);
853 switch (pin->mux) {
854 case AT91_MUX_GPIO:
855 at91_mux_gpio_enable(pio, mask, 1);
856 break;
857 case AT91_MUX_PERIPH_A:
858 info->ops->mux_A_periph(pio, mask);
859 break;
860 case AT91_MUX_PERIPH_B:
861 info->ops->mux_B_periph(pio, mask);
862 break;
863 case AT91_MUX_PERIPH_C:
864 if (!info->ops->mux_C_periph)
865 return -EINVAL;
866 info->ops->mux_C_periph(pio, mask);
867 break;
868 case AT91_MUX_PERIPH_D:
869 if (!info->ops->mux_D_periph)
870 return -EINVAL;
871 info->ops->mux_D_periph(pio, mask);
872 break;
873 }
874 if (pin->mux)
875 at91_mux_gpio_disable(pio, mask);
876 }
877
878 return 0;
879 }
880
881 static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
882 {
883 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
884
885 return info->nfunctions;
886 }
887
888 static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
889 unsigned selector)
890 {
891 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
892
893 return info->functions[selector].name;
894 }
895
896 static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
897 const char * const **groups,
898 unsigned * const num_groups)
899 {
900 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
901
902 *groups = info->functions[selector].groups;
903 *num_groups = info->functions[selector].ngroups;
904
905 return 0;
906 }
907
908 static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
909 struct pinctrl_gpio_range *range,
910 unsigned offset)
911 {
912 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
913 struct at91_gpio_chip *at91_chip;
914 struct gpio_chip *chip;
915 unsigned mask;
916
917 if (!range) {
918 dev_err(npct->dev, "invalid range\n");
919 return -EINVAL;
920 }
921 if (!range->gc) {
922 dev_err(npct->dev, "missing GPIO chip in range\n");
923 return -EINVAL;
924 }
925 chip = range->gc;
926 at91_chip = gpiochip_get_data(chip);
927
928 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
929
930 mask = 1 << (offset - chip->base);
931
932 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
933 offset, 'A' + range->id, offset - chip->base, mask);
934
935 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
936
937 return 0;
938 }
939
940 static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
941 struct pinctrl_gpio_range *range,
942 unsigned offset)
943 {
944 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
945
946 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
947 /* Set the pin to some default state, GPIO is usually default */
948 }
949
950 static const struct pinmux_ops at91_pmx_ops = {
951 .get_functions_count = at91_pmx_get_funcs_count,
952 .get_function_name = at91_pmx_get_func_name,
953 .get_function_groups = at91_pmx_get_groups,
954 .set_mux = at91_pmx_set,
955 .gpio_request_enable = at91_gpio_request_enable,
956 .gpio_disable_free = at91_gpio_disable_free,
957 };
958
959 static int at91_pinconf_get(struct pinctrl_dev *pctldev,
960 unsigned pin_id, unsigned long *config)
961 {
962 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
963 void __iomem *pio;
964 unsigned pin;
965 int div;
966 bool out;
967
968 *config = 0;
969 dev_dbg(info->dev, "%s:%d, pin_id=%d", __func__, __LINE__, pin_id);
970 pio = pin_to_controller(info, pin_to_bank(pin_id));
971
972 if (!pio)
973 return -EINVAL;
974
975 pin = pin_id % MAX_NB_GPIO_PER_BANK;
976
977 if (at91_mux_get_multidrive(pio, pin))
978 *config |= MULTI_DRIVE;
979
980 if (at91_mux_get_pullup(pio, pin))
981 *config |= PULL_UP;
982
983 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
984 *config |= DEGLITCH;
985 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
986 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
987 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
988 *config |= PULL_DOWN;
989 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
990 *config |= DIS_SCHMIT;
991 if (info->ops->get_drivestrength)
992 *config |= (info->ops->get_drivestrength(pio, pin)
993 << DRIVE_STRENGTH_SHIFT);
994 if (info->ops->get_slewrate)
995 *config |= (info->ops->get_slewrate(pio, pin) << SLEWRATE_SHIFT);
996 if (at91_mux_get_output(pio, pin, &out))
997 *config |= OUTPUT | (out << OUTPUT_VAL_SHIFT);
998
999 return 0;
1000 }
1001
1002 static int at91_pinconf_set(struct pinctrl_dev *pctldev,
1003 unsigned pin_id, unsigned long *configs,
1004 unsigned num_configs)
1005 {
1006 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
1007 unsigned mask;
1008 void __iomem *pio;
1009 int i;
1010 unsigned long config;
1011 unsigned pin;
1012
1013 for (i = 0; i < num_configs; i++) {
1014 config = configs[i];
1015
1016 dev_dbg(info->dev,
1017 "%s:%d, pin_id=%d, config=0x%lx",
1018 __func__, __LINE__, pin_id, config);
1019 pio = pin_to_controller(info, pin_to_bank(pin_id));
1020
1021 if (!pio)
1022 return -EINVAL;
1023
1024 pin = pin_id % MAX_NB_GPIO_PER_BANK;
1025 mask = pin_to_mask(pin);
1026
1027 if (config & PULL_UP && config & PULL_DOWN)
1028 return -EINVAL;
1029
1030 at91_mux_set_output(pio, mask, config & OUTPUT,
1031 (config & OUTPUT_VAL) >> OUTPUT_VAL_SHIFT);
1032 at91_mux_set_pullup(pio, mask, config & PULL_UP);
1033 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
1034 if (info->ops->set_deglitch)
1035 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
1036 if (info->ops->set_debounce)
1037 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
1038 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
1039 if (info->ops->set_pulldown)
1040 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
1041 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
1042 info->ops->disable_schmitt_trig(pio, mask);
1043 if (info->ops->set_drivestrength)
1044 info->ops->set_drivestrength(pio, pin,
1045 (config & DRIVE_STRENGTH)
1046 >> DRIVE_STRENGTH_SHIFT);
1047 if (info->ops->set_slewrate)
1048 info->ops->set_slewrate(pio, pin,
1049 (config & SLEWRATE) >> SLEWRATE_SHIFT);
1050
1051 } /* for each config */
1052
1053 return 0;
1054 }
1055
1056 #define DBG_SHOW_FLAG(flag) do { \
1057 if (config & flag) { \
1058 if (num_conf) \
1059 seq_puts(s, "|"); \
1060 seq_puts(s, #flag); \
1061 num_conf++; \
1062 } \
1063 } while (0)
1064
1065 #define DBG_SHOW_FLAG_MASKED(mask, flag, name) do { \
1066 if ((config & mask) == flag) { \
1067 if (num_conf) \
1068 seq_puts(s, "|"); \
1069 seq_puts(s, #name); \
1070 num_conf++; \
1071 } \
1072 } while (0)
1073
1074 static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
1075 struct seq_file *s, unsigned pin_id)
1076 {
1077 unsigned long config;
1078 int val, num_conf = 0;
1079
1080 at91_pinconf_get(pctldev, pin_id, &config);
1081
1082 DBG_SHOW_FLAG(MULTI_DRIVE);
1083 DBG_SHOW_FLAG(PULL_UP);
1084 DBG_SHOW_FLAG(PULL_DOWN);
1085 DBG_SHOW_FLAG(DIS_SCHMIT);
1086 DBG_SHOW_FLAG(DEGLITCH);
1087 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(LOW),
1088 DRIVE_STRENGTH_LOW);
1089 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(MED),
1090 DRIVE_STRENGTH_MED);
1091 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(HI),
1092 DRIVE_STRENGTH_HI);
1093 DBG_SHOW_FLAG(SLEWRATE);
1094 DBG_SHOW_FLAG(DEBOUNCE);
1095 if (config & DEBOUNCE) {
1096 val = config >> DEBOUNCE_VAL_SHIFT;
1097 seq_printf(s, "(%d)", val);
1098 }
1099
1100 return;
1101 }
1102
1103 static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
1104 struct seq_file *s, unsigned group)
1105 {
1106 }
1107
1108 static const struct pinconf_ops at91_pinconf_ops = {
1109 .pin_config_get = at91_pinconf_get,
1110 .pin_config_set = at91_pinconf_set,
1111 .pin_config_dbg_show = at91_pinconf_dbg_show,
1112 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
1113 };
1114
1115 static struct pinctrl_desc at91_pinctrl_desc = {
1116 .pctlops = &at91_pctrl_ops,
1117 .pmxops = &at91_pmx_ops,
1118 .confops = &at91_pinconf_ops,
1119 .owner = THIS_MODULE,
1120 };
1121
1122 static const char *gpio_compat = "atmel,at91rm9200-gpio";
1123
1124 static void at91_pinctrl_child_count(struct at91_pinctrl *info,
1125 struct device_node *np)
1126 {
1127 struct device_node *child;
1128
1129 for_each_child_of_node(np, child) {
1130 if (of_device_is_compatible(child, gpio_compat)) {
1131 if (of_device_is_available(child))
1132 info->nactive_banks++;
1133 } else {
1134 info->nfunctions++;
1135 info->ngroups += of_get_child_count(child);
1136 }
1137 }
1138 }
1139
1140 static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
1141 struct device_node *np)
1142 {
1143 int ret = 0;
1144 int size;
1145 const __be32 *list;
1146
1147 list = of_get_property(np, "atmel,mux-mask", &size);
1148 if (!list) {
1149 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
1150 return -EINVAL;
1151 }
1152
1153 size /= sizeof(*list);
1154 if (!size || size % gpio_banks) {
1155 dev_err(info->dev, "wrong mux mask array should be by %d\n", gpio_banks);
1156 return -EINVAL;
1157 }
1158 info->nmux = size / gpio_banks;
1159
1160 info->mux_mask = devm_kcalloc(info->dev, size, sizeof(u32),
1161 GFP_KERNEL);
1162 if (!info->mux_mask)
1163 return -ENOMEM;
1164
1165 ret = of_property_read_u32_array(np, "atmel,mux-mask",
1166 info->mux_mask, size);
1167 if (ret)
1168 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
1169 return ret;
1170 }
1171
1172 static int at91_pinctrl_parse_groups(struct device_node *np,
1173 struct at91_pin_group *grp,
1174 struct at91_pinctrl *info, u32 index)
1175 {
1176 struct at91_pmx_pin *pin;
1177 int size;
1178 const __be32 *list;
1179 int i, j;
1180
1181 dev_dbg(info->dev, "group(%d): %pOFn\n", index, np);
1182
1183 /* Initialise group */
1184 grp->name = np->name;
1185
1186 /*
1187 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
1188 * do sanity check and calculate pins number
1189 */
1190 list = of_get_property(np, "atmel,pins", &size);
1191 /* we do not check return since it's safe node passed down */
1192 size /= sizeof(*list);
1193 if (!size || size % 4) {
1194 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
1195 return -EINVAL;
1196 }
1197
1198 grp->npins = size / 4;
1199 pin = grp->pins_conf = devm_kcalloc(info->dev,
1200 grp->npins,
1201 sizeof(struct at91_pmx_pin),
1202 GFP_KERNEL);
1203 grp->pins = devm_kcalloc(info->dev, grp->npins, sizeof(unsigned int),
1204 GFP_KERNEL);
1205 if (!grp->pins_conf || !grp->pins)
1206 return -ENOMEM;
1207
1208 for (i = 0, j = 0; i < size; i += 4, j++) {
1209 pin->bank = be32_to_cpu(*list++);
1210 pin->pin = be32_to_cpu(*list++);
1211 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
1212 pin->mux = be32_to_cpu(*list++);
1213 pin->conf = be32_to_cpu(*list++);
1214
1215 at91_pin_dbg(info->dev, pin);
1216 pin++;
1217 }
1218
1219 return 0;
1220 }
1221
1222 static int at91_pinctrl_parse_functions(struct device_node *np,
1223 struct at91_pinctrl *info, u32 index)
1224 {
1225 struct device_node *child;
1226 struct at91_pmx_func *func;
1227 struct at91_pin_group *grp;
1228 int ret;
1229 static u32 grp_index;
1230 u32 i = 0;
1231
1232 dev_dbg(info->dev, "parse function(%d): %pOFn\n", index, np);
1233
1234 func = &info->functions[index];
1235
1236 /* Initialise function */
1237 func->name = np->name;
1238 func->ngroups = of_get_child_count(np);
1239 if (func->ngroups == 0) {
1240 dev_err(info->dev, "no groups defined\n");
1241 return -EINVAL;
1242 }
1243 func->groups = devm_kcalloc(info->dev,
1244 func->ngroups, sizeof(char *), GFP_KERNEL);
1245 if (!func->groups)
1246 return -ENOMEM;
1247
1248 for_each_child_of_node(np, child) {
1249 func->groups[i] = child->name;
1250 grp = &info->groups[grp_index++];
1251 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
1252 if (ret) {
1253 of_node_put(child);
1254 return ret;
1255 }
1256 }
1257
1258 return 0;
1259 }
1260
1261 static const struct of_device_id at91_pinctrl_of_match[] = {
1262 { .compatible = "atmel,sama5d3-pinctrl", .data = &sama5d3_ops },
1263 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
1264 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
1265 { .compatible = "microchip,sam9x60-pinctrl", .data = &sam9x60_ops },
1266 { /* sentinel */ }
1267 };
1268
1269 static int at91_pinctrl_probe_dt(struct platform_device *pdev,
1270 struct at91_pinctrl *info)
1271 {
1272 int ret = 0;
1273 int i, j;
1274 uint32_t *tmp;
1275 struct device_node *np = pdev->dev.of_node;
1276 struct device_node *child;
1277
1278 if (!np)
1279 return -ENODEV;
1280
1281 info->dev = &pdev->dev;
1282 info->ops = (struct at91_pinctrl_mux_ops *)
1283 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
1284 at91_pinctrl_child_count(info, np);
1285
1286 if (gpio_banks < 1) {
1287 dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n");
1288 return -EINVAL;
1289 }
1290
1291 ret = at91_pinctrl_mux_mask(info, np);
1292 if (ret)
1293 return ret;
1294
1295 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
1296
1297 dev_dbg(&pdev->dev, "mux-mask\n");
1298 tmp = info->mux_mask;
1299 for (i = 0; i < gpio_banks; i++) {
1300 for (j = 0; j < info->nmux; j++, tmp++) {
1301 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
1302 }
1303 }
1304
1305 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1306 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1307 info->functions = devm_kcalloc(&pdev->dev,
1308 info->nfunctions,
1309 sizeof(struct at91_pmx_func),
1310 GFP_KERNEL);
1311 if (!info->functions)
1312 return -ENOMEM;
1313
1314 info->groups = devm_kcalloc(&pdev->dev,
1315 info->ngroups,
1316 sizeof(struct at91_pin_group),
1317 GFP_KERNEL);
1318 if (!info->groups)
1319 return -ENOMEM;
1320
1321 dev_dbg(&pdev->dev, "nbanks = %d\n", gpio_banks);
1322 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1323 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1324
1325 i = 0;
1326
1327 for_each_child_of_node(np, child) {
1328 if (of_device_is_compatible(child, gpio_compat))
1329 continue;
1330 ret = at91_pinctrl_parse_functions(child, info, i++);
1331 if (ret) {
1332 dev_err(&pdev->dev, "failed to parse function\n");
1333 of_node_put(child);
1334 return ret;
1335 }
1336 }
1337
1338 return 0;
1339 }
1340
1341 static int at91_pinctrl_probe(struct platform_device *pdev)
1342 {
1343 struct at91_pinctrl *info;
1344 struct pinctrl_pin_desc *pdesc;
1345 int ret, i, j, k, ngpio_chips_enabled = 0;
1346
1347 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1348 if (!info)
1349 return -ENOMEM;
1350
1351 ret = at91_pinctrl_probe_dt(pdev, info);
1352 if (ret)
1353 return ret;
1354
1355 /*
1356 * We need all the GPIO drivers to probe FIRST, or we will not be able
1357 * to obtain references to the struct gpio_chip * for them, and we
1358 * need this to proceed.
1359 */
1360 for (i = 0; i < gpio_banks; i++)
1361 if (gpio_chips[i])
1362 ngpio_chips_enabled++;
1363
1364 if (ngpio_chips_enabled < info->nactive_banks) {
1365 dev_warn(&pdev->dev,
1366 "All GPIO chips are not registered yet (%d/%d)\n",
1367 ngpio_chips_enabled, info->nactive_banks);
1368 devm_kfree(&pdev->dev, info);
1369 return -EPROBE_DEFER;
1370 }
1371
1372 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1373 at91_pinctrl_desc.npins = gpio_banks * MAX_NB_GPIO_PER_BANK;
1374 at91_pinctrl_desc.pins = pdesc =
1375 devm_kcalloc(&pdev->dev,
1376 at91_pinctrl_desc.npins, sizeof(*pdesc),
1377 GFP_KERNEL);
1378
1379 if (!at91_pinctrl_desc.pins)
1380 return -ENOMEM;
1381
1382 for (i = 0, k = 0; i < gpio_banks; i++) {
1383 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1384 pdesc->number = k;
1385 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1386 pdesc++;
1387 }
1388 }
1389
1390 platform_set_drvdata(pdev, info);
1391 info->pctl = devm_pinctrl_register(&pdev->dev, &at91_pinctrl_desc,
1392 info);
1393
1394 if (IS_ERR(info->pctl)) {
1395 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1396 return PTR_ERR(info->pctl);
1397 }
1398
1399 /* We will handle a range of GPIO pins */
1400 for (i = 0; i < gpio_banks; i++)
1401 if (gpio_chips[i])
1402 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1403
1404 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1405
1406 return 0;
1407 }
1408
1409 static int at91_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
1410 {
1411 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1412 void __iomem *pio = at91_gpio->regbase;
1413 unsigned mask = 1 << offset;
1414 u32 osr;
1415
1416 osr = readl_relaxed(pio + PIO_OSR);
1417 return !(osr & mask);
1418 }
1419
1420 static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1421 {
1422 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1423 void __iomem *pio = at91_gpio->regbase;
1424 unsigned mask = 1 << offset;
1425
1426 writel_relaxed(mask, pio + PIO_ODR);
1427 return 0;
1428 }
1429
1430 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1431 {
1432 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1433 void __iomem *pio = at91_gpio->regbase;
1434 unsigned mask = 1 << offset;
1435 u32 pdsr;
1436
1437 pdsr = readl_relaxed(pio + PIO_PDSR);
1438 return (pdsr & mask) != 0;
1439 }
1440
1441 static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1442 int val)
1443 {
1444 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1445 void __iomem *pio = at91_gpio->regbase;
1446 unsigned mask = 1 << offset;
1447
1448 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1449 }
1450
1451 static void at91_gpio_set_multiple(struct gpio_chip *chip,
1452 unsigned long *mask, unsigned long *bits)
1453 {
1454 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1455 void __iomem *pio = at91_gpio->regbase;
1456
1457 #define BITS_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
1458 /* Mask additionally to ngpio as not all GPIO controllers have 32 pins */
1459 uint32_t set_mask = (*mask & *bits) & BITS_MASK(chip->ngpio);
1460 uint32_t clear_mask = (*mask & ~(*bits)) & BITS_MASK(chip->ngpio);
1461
1462 writel_relaxed(set_mask, pio + PIO_SODR);
1463 writel_relaxed(clear_mask, pio + PIO_CODR);
1464 }
1465
1466 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1467 int val)
1468 {
1469 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1470 void __iomem *pio = at91_gpio->regbase;
1471 unsigned mask = 1 << offset;
1472
1473 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1474 writel_relaxed(mask, pio + PIO_OER);
1475
1476 return 0;
1477 }
1478
1479 #ifdef CONFIG_DEBUG_FS
1480 static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1481 {
1482 enum at91_mux mode;
1483 int i;
1484 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1485 void __iomem *pio = at91_gpio->regbase;
1486
1487 for (i = 0; i < chip->ngpio; i++) {
1488 unsigned mask = pin_to_mask(i);
1489 const char *gpio_label;
1490
1491 gpio_label = gpiochip_is_requested(chip, i);
1492 if (!gpio_label)
1493 continue;
1494 mode = at91_gpio->ops->get_periph(pio, mask);
1495 seq_printf(s, "[%s] GPIO%s%d: ",
1496 gpio_label, chip->label, i);
1497 if (mode == AT91_MUX_GPIO) {
1498 seq_printf(s, "[gpio] ");
1499 seq_printf(s, "%s ",
1500 readl_relaxed(pio + PIO_OSR) & mask ?
1501 "output" : "input");
1502 seq_printf(s, "%s\n",
1503 readl_relaxed(pio + PIO_PDSR) & mask ?
1504 "set" : "clear");
1505 } else {
1506 seq_printf(s, "[periph %c]\n",
1507 mode + 'A' - 1);
1508 }
1509 }
1510 }
1511 #else
1512 #define at91_gpio_dbg_show NULL
1513 #endif
1514
1515 /* Several AIC controller irqs are dispatched through this GPIO handler.
1516 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1517 * at91_set_gpio_input() then maybe enable its glitch filter.
1518 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1519 * handler.
1520 * First implementation always triggers on rising and falling edges
1521 * whereas the newer PIO3 can be additionally configured to trigger on
1522 * level, edge with any polarity.
1523 *
1524 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1525 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1526 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1527 */
1528
1529 static void gpio_irq_mask(struct irq_data *d)
1530 {
1531 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1532 void __iomem *pio = at91_gpio->regbase;
1533 unsigned mask = 1 << d->hwirq;
1534
1535 if (pio)
1536 writel_relaxed(mask, pio + PIO_IDR);
1537 }
1538
1539 static void gpio_irq_unmask(struct irq_data *d)
1540 {
1541 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1542 void __iomem *pio = at91_gpio->regbase;
1543 unsigned mask = 1 << d->hwirq;
1544
1545 if (pio)
1546 writel_relaxed(mask, pio + PIO_IER);
1547 }
1548
1549 static int gpio_irq_type(struct irq_data *d, unsigned type)
1550 {
1551 switch (type) {
1552 case IRQ_TYPE_NONE:
1553 case IRQ_TYPE_EDGE_BOTH:
1554 return 0;
1555 default:
1556 return -EINVAL;
1557 }
1558 }
1559
1560 /* Alternate irq type for PIO3 support */
1561 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1562 {
1563 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1564 void __iomem *pio = at91_gpio->regbase;
1565 unsigned mask = 1 << d->hwirq;
1566
1567 switch (type) {
1568 case IRQ_TYPE_EDGE_RISING:
1569 irq_set_handler_locked(d, handle_simple_irq);
1570 writel_relaxed(mask, pio + PIO_ESR);
1571 writel_relaxed(mask, pio + PIO_REHLSR);
1572 break;
1573 case IRQ_TYPE_EDGE_FALLING:
1574 irq_set_handler_locked(d, handle_simple_irq);
1575 writel_relaxed(mask, pio + PIO_ESR);
1576 writel_relaxed(mask, pio + PIO_FELLSR);
1577 break;
1578 case IRQ_TYPE_LEVEL_LOW:
1579 irq_set_handler_locked(d, handle_level_irq);
1580 writel_relaxed(mask, pio + PIO_LSR);
1581 writel_relaxed(mask, pio + PIO_FELLSR);
1582 break;
1583 case IRQ_TYPE_LEVEL_HIGH:
1584 irq_set_handler_locked(d, handle_level_irq);
1585 writel_relaxed(mask, pio + PIO_LSR);
1586 writel_relaxed(mask, pio + PIO_REHLSR);
1587 break;
1588 case IRQ_TYPE_EDGE_BOTH:
1589 /*
1590 * disable additional interrupt modes:
1591 * fall back to default behavior
1592 */
1593 irq_set_handler_locked(d, handle_simple_irq);
1594 writel_relaxed(mask, pio + PIO_AIMDR);
1595 return 0;
1596 case IRQ_TYPE_NONE:
1597 default:
1598 pr_warn("AT91: No type for GPIO irq offset %d\n", d->irq);
1599 return -EINVAL;
1600 }
1601
1602 /* enable additional interrupt modes */
1603 writel_relaxed(mask, pio + PIO_AIMER);
1604
1605 return 0;
1606 }
1607
1608 static void gpio_irq_ack(struct irq_data *d)
1609 {
1610 /* the interrupt is already cleared before by reading ISR */
1611 }
1612
1613 #ifdef CONFIG_PM
1614
1615 static u32 wakeups[MAX_GPIO_BANKS];
1616 static u32 backups[MAX_GPIO_BANKS];
1617
1618 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1619 {
1620 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1621 unsigned bank = at91_gpio->pioc_idx;
1622 unsigned mask = 1 << d->hwirq;
1623
1624 if (unlikely(bank >= MAX_GPIO_BANKS))
1625 return -EINVAL;
1626
1627 if (state)
1628 wakeups[bank] |= mask;
1629 else
1630 wakeups[bank] &= ~mask;
1631
1632 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1633
1634 return 0;
1635 }
1636
1637 void at91_pinctrl_gpio_suspend(void)
1638 {
1639 int i;
1640
1641 for (i = 0; i < gpio_banks; i++) {
1642 void __iomem *pio;
1643
1644 if (!gpio_chips[i])
1645 continue;
1646
1647 pio = gpio_chips[i]->regbase;
1648
1649 backups[i] = readl_relaxed(pio + PIO_IMR);
1650 writel_relaxed(backups[i], pio + PIO_IDR);
1651 writel_relaxed(wakeups[i], pio + PIO_IER);
1652
1653 if (!wakeups[i])
1654 clk_disable_unprepare(gpio_chips[i]->clock);
1655 else
1656 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
1657 'A'+i, wakeups[i]);
1658 }
1659 }
1660
1661 void at91_pinctrl_gpio_resume(void)
1662 {
1663 int i;
1664
1665 for (i = 0; i < gpio_banks; i++) {
1666 void __iomem *pio;
1667
1668 if (!gpio_chips[i])
1669 continue;
1670
1671 pio = gpio_chips[i]->regbase;
1672
1673 if (!wakeups[i])
1674 clk_prepare_enable(gpio_chips[i]->clock);
1675
1676 writel_relaxed(wakeups[i], pio + PIO_IDR);
1677 writel_relaxed(backups[i], pio + PIO_IER);
1678 }
1679 }
1680
1681 #else
1682 #define gpio_irq_set_wake NULL
1683 #endif /* CONFIG_PM */
1684
1685 static void gpio_irq_handler(struct irq_desc *desc)
1686 {
1687 struct irq_chip *chip = irq_desc_get_chip(desc);
1688 struct gpio_chip *gpio_chip = irq_desc_get_handler_data(desc);
1689 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(gpio_chip);
1690 void __iomem *pio = at91_gpio->regbase;
1691 unsigned long isr;
1692 int n;
1693
1694 chained_irq_enter(chip, desc);
1695 for (;;) {
1696 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
1697 * When there are none pending, we're finished unless we need
1698 * to process multiple banks (like ID_PIOCDE on sam9263).
1699 */
1700 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1701 if (!isr) {
1702 if (!at91_gpio->next)
1703 break;
1704 at91_gpio = at91_gpio->next;
1705 pio = at91_gpio->regbase;
1706 gpio_chip = &at91_gpio->chip;
1707 continue;
1708 }
1709
1710 for_each_set_bit(n, &isr, BITS_PER_LONG) {
1711 generic_handle_irq(irq_find_mapping(
1712 gpio_chip->irq.domain, n));
1713 }
1714 }
1715 chained_irq_exit(chip, desc);
1716 /* now it may re-trigger */
1717 }
1718
1719 static int at91_gpio_of_irq_setup(struct platform_device *pdev,
1720 struct at91_gpio_chip *at91_gpio)
1721 {
1722 struct gpio_chip *gpiochip_prev = NULL;
1723 struct at91_gpio_chip *prev = NULL;
1724 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
1725 struct irq_chip *gpio_irqchip;
1726 struct gpio_irq_chip *girq;
1727 int i;
1728
1729 gpio_irqchip = devm_kzalloc(&pdev->dev, sizeof(*gpio_irqchip),
1730 GFP_KERNEL);
1731 if (!gpio_irqchip)
1732 return -ENOMEM;
1733
1734 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1735
1736 gpio_irqchip->name = "GPIO";
1737 gpio_irqchip->irq_ack = gpio_irq_ack;
1738 gpio_irqchip->irq_disable = gpio_irq_mask;
1739 gpio_irqchip->irq_mask = gpio_irq_mask;
1740 gpio_irqchip->irq_unmask = gpio_irq_unmask;
1741 gpio_irqchip->irq_set_wake = gpio_irq_set_wake,
1742 gpio_irqchip->irq_set_type = at91_gpio->ops->irq_type;
1743
1744 /* Disable irqs of this PIO controller */
1745 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1746
1747 /*
1748 * Let the generic code handle this edge IRQ, the the chained
1749 * handler will perform the actual work of handling the parent
1750 * interrupt.
1751 */
1752 girq = &at91_gpio->chip.irq;
1753 girq->chip = gpio_irqchip;
1754 girq->default_type = IRQ_TYPE_NONE;
1755 girq->handler = handle_edge_irq;
1756
1757 /*
1758 * The top level handler handles one bank of GPIOs, except
1759 * on some SoC it can handle up to three...
1760 * We only set up the handler for the first of the list.
1761 */
1762 gpiochip_prev = irq_get_handler_data(at91_gpio->pioc_virq);
1763 if (!gpiochip_prev) {
1764 girq->parent_handler = gpio_irq_handler;
1765 girq->num_parents = 1;
1766 girq->parents = devm_kcalloc(&pdev->dev, 1,
1767 sizeof(*girq->parents),
1768 GFP_KERNEL);
1769 if (!girq->parents)
1770 return -ENOMEM;
1771 girq->parents[0] = at91_gpio->pioc_virq;
1772 return 0;
1773 }
1774
1775 prev = gpiochip_get_data(gpiochip_prev);
1776 /* we can only have 2 banks before */
1777 for (i = 0; i < 2; i++) {
1778 if (prev->next) {
1779 prev = prev->next;
1780 } else {
1781 prev->next = at91_gpio;
1782 return 0;
1783 }
1784 }
1785
1786 return -EINVAL;
1787 }
1788
1789 /* This structure is replicated for each GPIO block allocated at probe time */
1790 static const struct gpio_chip at91_gpio_template = {
1791 .request = gpiochip_generic_request,
1792 .free = gpiochip_generic_free,
1793 .get_direction = at91_gpio_get_direction,
1794 .direction_input = at91_gpio_direction_input,
1795 .get = at91_gpio_get,
1796 .direction_output = at91_gpio_direction_output,
1797 .set = at91_gpio_set,
1798 .set_multiple = at91_gpio_set_multiple,
1799 .dbg_show = at91_gpio_dbg_show,
1800 .can_sleep = false,
1801 .ngpio = MAX_NB_GPIO_PER_BANK,
1802 };
1803
1804 static const struct of_device_id at91_gpio_of_match[] = {
1805 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1806 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1807 { .compatible = "microchip,sam9x60-gpio", .data = &sam9x60_ops },
1808 { /* sentinel */ }
1809 };
1810
1811 static int at91_gpio_probe(struct platform_device *pdev)
1812 {
1813 struct device_node *np = pdev->dev.of_node;
1814 struct at91_gpio_chip *at91_chip = NULL;
1815 struct gpio_chip *chip;
1816 struct pinctrl_gpio_range *range;
1817 int ret = 0;
1818 int irq, i;
1819 int alias_idx = of_alias_get_id(np, "gpio");
1820 uint32_t ngpio;
1821 char **names;
1822
1823 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1824 if (gpio_chips[alias_idx]) {
1825 ret = -EBUSY;
1826 goto err;
1827 }
1828
1829 irq = platform_get_irq(pdev, 0);
1830 if (irq < 0) {
1831 ret = irq;
1832 goto err;
1833 }
1834
1835 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1836 if (!at91_chip) {
1837 ret = -ENOMEM;
1838 goto err;
1839 }
1840
1841 at91_chip->regbase = devm_platform_ioremap_resource(pdev, 0);
1842 if (IS_ERR(at91_chip->regbase)) {
1843 ret = PTR_ERR(at91_chip->regbase);
1844 goto err;
1845 }
1846
1847 at91_chip->ops = (struct at91_pinctrl_mux_ops *)
1848 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1849 at91_chip->pioc_virq = irq;
1850 at91_chip->pioc_idx = alias_idx;
1851
1852 at91_chip->clock = devm_clk_get(&pdev->dev, NULL);
1853 if (IS_ERR(at91_chip->clock)) {
1854 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1855 ret = PTR_ERR(at91_chip->clock);
1856 goto err;
1857 }
1858
1859 ret = clk_prepare_enable(at91_chip->clock);
1860 if (ret) {
1861 dev_err(&pdev->dev, "failed to prepare and enable clock, ignoring.\n");
1862 goto clk_enable_err;
1863 }
1864
1865 at91_chip->chip = at91_gpio_template;
1866
1867 chip = &at91_chip->chip;
1868 chip->of_node = np;
1869 chip->label = dev_name(&pdev->dev);
1870 chip->parent = &pdev->dev;
1871 chip->owner = THIS_MODULE;
1872 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1873
1874 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1875 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1876 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1877 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1878 else
1879 chip->ngpio = ngpio;
1880 }
1881
1882 names = devm_kcalloc(&pdev->dev, chip->ngpio, sizeof(char *),
1883 GFP_KERNEL);
1884
1885 if (!names) {
1886 ret = -ENOMEM;
1887 goto clk_enable_err;
1888 }
1889
1890 for (i = 0; i < chip->ngpio; i++)
1891 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1892
1893 chip->names = (const char *const *)names;
1894
1895 range = &at91_chip->range;
1896 range->name = chip->label;
1897 range->id = alias_idx;
1898 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1899
1900 range->npins = chip->ngpio;
1901 range->gc = chip;
1902
1903 ret = at91_gpio_of_irq_setup(pdev, at91_chip);
1904 if (ret)
1905 goto gpiochip_add_err;
1906
1907 ret = gpiochip_add_data(chip, at91_chip);
1908 if (ret)
1909 goto gpiochip_add_err;
1910
1911 gpio_chips[alias_idx] = at91_chip;
1912 gpio_banks = max(gpio_banks, alias_idx + 1);
1913
1914 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1915
1916 return 0;
1917
1918 gpiochip_add_err:
1919 clk_enable_err:
1920 clk_disable_unprepare(at91_chip->clock);
1921 err:
1922 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1923
1924 return ret;
1925 }
1926
1927 static struct platform_driver at91_gpio_driver = {
1928 .driver = {
1929 .name = "gpio-at91",
1930 .of_match_table = at91_gpio_of_match,
1931 },
1932 .probe = at91_gpio_probe,
1933 };
1934
1935 static struct platform_driver at91_pinctrl_driver = {
1936 .driver = {
1937 .name = "pinctrl-at91",
1938 .of_match_table = at91_pinctrl_of_match,
1939 },
1940 .probe = at91_pinctrl_probe,
1941 };
1942
1943 static struct platform_driver * const drivers[] = {
1944 &at91_gpio_driver,
1945 &at91_pinctrl_driver,
1946 };
1947
1948 static int __init at91_pinctrl_init(void)
1949 {
1950 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1951 }
1952 arch_initcall(at91_pinctrl_init);
Linux with added FPC-III support