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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-at91.c
blob523b6b794d1f7789bf2b147345b75db96a9eea8b
1 /*
2 * at91 pinctrl driver based on at91 pinmux core
3 *
4 * Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
5 *
6 * Under GPLv2 only
7 */
8
9 #include <linux/clk.h>
10 #include <linux/err.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_device.h>
15 #include <linux/of_address.h>
16 #include <linux/of_irq.h>
17 #include <linux/slab.h>
18 #include <linux/interrupt.h>
19 #include <linux/io.h>
20 #include <linux/gpio.h>
21 #include <linux/pinctrl/machine.h>
22 #include <linux/pinctrl/pinconf.h>
23 #include <linux/pinctrl/pinctrl.h>
24 #include <linux/pinctrl/pinmux.h>
25 /* Since we request GPIOs from ourself */
26 #include <linux/pinctrl/consumer.h>
27
28 #include "pinctrl-at91.h"
29 #include "core.h"
30
31 #define MAX_GPIO_BANKS 5
32 #define MAX_NB_GPIO_PER_BANK 32
33
34 struct at91_pinctrl_mux_ops;
35
36 struct at91_gpio_chip {
37 struct gpio_chip chip;
38 struct pinctrl_gpio_range range;
39 struct at91_gpio_chip *next; /* Bank sharing same clock */
40 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
41 int pioc_virq; /* PIO bank Linux virtual interrupt */
42 int pioc_idx; /* PIO bank index */
43 void __iomem *regbase; /* PIO bank virtual address */
44 struct clk *clock; /* associated clock */
45 struct at91_pinctrl_mux_ops *ops; /* ops */
46 };
47
48 static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
49
50 static int gpio_banks;
51
52 #define PULL_UP (1 << 0)
53 #define MULTI_DRIVE (1 << 1)
54 #define DEGLITCH (1 << 2)
55 #define PULL_DOWN (1 << 3)
56 #define DIS_SCHMIT (1 << 4)
57 #define DRIVE_STRENGTH_SHIFT 5
58 #define DRIVE_STRENGTH_MASK 0x3
59 #define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT)
60 #define DEBOUNCE (1 << 16)
61 #define DEBOUNCE_VAL_SHIFT 17
62 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
63
64 /**
65 * These defines will translated the dt binding settings to our internal
66 * settings. They are not necessarily the same value as the register setting.
67 * The actual drive strength current of low, medium and high must be looked up
68 * from the corresponding device datasheet. This value is different for pins
69 * that are even in the same banks. It is also dependent on VCC.
70 * DRIVE_STRENGTH_DEFAULT is just a placeholder to avoid changing the drive
71 * strength when there is no dt config for it.
72 */
73 #define DRIVE_STRENGTH_DEFAULT (0 << DRIVE_STRENGTH_SHIFT)
74 #define DRIVE_STRENGTH_LOW (1 << DRIVE_STRENGTH_SHIFT)
75 #define DRIVE_STRENGTH_MED (2 << DRIVE_STRENGTH_SHIFT)
76 #define DRIVE_STRENGTH_HI (3 << DRIVE_STRENGTH_SHIFT)
77
78 /**
79 * struct at91_pmx_func - describes AT91 pinmux functions
80 * @name: the name of this specific function
81 * @groups: corresponding pin groups
82 * @ngroups: the number of groups
83 */
84 struct at91_pmx_func {
85 const char *name;
86 const char **groups;
87 unsigned ngroups;
88 };
89
90 enum at91_mux {
91 AT91_MUX_GPIO = 0,
92 AT91_MUX_PERIPH_A = 1,
93 AT91_MUX_PERIPH_B = 2,
94 AT91_MUX_PERIPH_C = 3,
95 AT91_MUX_PERIPH_D = 4,
96 };
97
98 /**
99 * struct at91_pmx_pin - describes an At91 pin mux
100 * @bank: the bank of the pin
101 * @pin: the pin number in the @bank
102 * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
103 * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
104 */
105 struct at91_pmx_pin {
106 uint32_t bank;
107 uint32_t pin;
108 enum at91_mux mux;
109 unsigned long conf;
110 };
111
112 /**
113 * struct at91_pin_group - describes an At91 pin group
114 * @name: the name of this specific pin group
115 * @pins_conf: the mux mode for each pin in this group. The size of this
116 * array is the same as pins.
117 * @pins: an array of discrete physical pins used in this group, taken
118 * from the driver-local pin enumeration space
119 * @npins: the number of pins in this group array, i.e. the number of
120 * elements in .pins so we can iterate over that array
121 */
122 struct at91_pin_group {
123 const char *name;
124 struct at91_pmx_pin *pins_conf;
125 unsigned int *pins;
126 unsigned npins;
127 };
128
129 /**
130 * struct at91_pinctrl_mux_ops - describes an AT91 mux ops group
131 * on new IP with support for periph C and D the way to mux in
132 * periph A and B has changed
133 * So provide the right call back
134 * if not present means the IP does not support it
135 * @get_periph: return the periph mode configured
136 * @mux_A_periph: mux as periph A
137 * @mux_B_periph: mux as periph B
138 * @mux_C_periph: mux as periph C
139 * @mux_D_periph: mux as periph D
140 * @get_deglitch: get deglitch status
141 * @set_deglitch: enable/disable deglitch
142 * @get_debounce: get debounce status
143 * @set_debounce: enable/disable debounce
144 * @get_pulldown: get pulldown status
145 * @set_pulldown: enable/disable pulldown
146 * @get_schmitt_trig: get schmitt trigger status
147 * @disable_schmitt_trig: disable schmitt trigger
148 * @irq_type: return irq type
149 */
150 struct at91_pinctrl_mux_ops {
151 enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
152 void (*mux_A_periph)(void __iomem *pio, unsigned mask);
153 void (*mux_B_periph)(void __iomem *pio, unsigned mask);
154 void (*mux_C_periph)(void __iomem *pio, unsigned mask);
155 void (*mux_D_periph)(void __iomem *pio, unsigned mask);
156 bool (*get_deglitch)(void __iomem *pio, unsigned pin);
157 void (*set_deglitch)(void __iomem *pio, unsigned mask, bool is_on);
158 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
159 void (*set_debounce)(void __iomem *pio, unsigned mask, bool is_on, u32 div);
160 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
161 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool is_on);
162 bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
163 void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
164 unsigned (*get_drivestrength)(void __iomem *pio, unsigned pin);
165 void (*set_drivestrength)(void __iomem *pio, unsigned pin,
166 u32 strength);
167 /* irq */
168 int (*irq_type)(struct irq_data *d, unsigned type);
169 };
170
171 static int gpio_irq_type(struct irq_data *d, unsigned type);
172 static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
173
174 struct at91_pinctrl {
175 struct device *dev;
176 struct pinctrl_dev *pctl;
177
178 int nactive_banks;
179
180 uint32_t *mux_mask;
181 int nmux;
182
183 struct at91_pmx_func *functions;
184 int nfunctions;
185
186 struct at91_pin_group *groups;
187 int ngroups;
188
189 struct at91_pinctrl_mux_ops *ops;
190 };
191
192 static const inline struct at91_pin_group *at91_pinctrl_find_group_by_name(
193 const struct at91_pinctrl *info,
194 const char *name)
195 {
196 const struct at91_pin_group *grp = NULL;
197 int i;
198
199 for (i = 0; i < info->ngroups; i++) {
200 if (strcmp(info->groups[i].name, name))
201 continue;
202
203 grp = &info->groups[i];
204 dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
205 break;
206 }
207
208 return grp;
209 }
210
211 static int at91_get_groups_count(struct pinctrl_dev *pctldev)
212 {
213 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
214
215 return info->ngroups;
216 }
217
218 static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
219 unsigned selector)
220 {
221 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
222
223 return info->groups[selector].name;
224 }
225
226 static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
227 const unsigned **pins,
228 unsigned *npins)
229 {
230 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
231
232 if (selector >= info->ngroups)
233 return -EINVAL;
234
235 *pins = info->groups[selector].pins;
236 *npins = info->groups[selector].npins;
237
238 return 0;
239 }
240
241 static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
242 unsigned offset)
243 {
244 seq_printf(s, "%s", dev_name(pctldev->dev));
245 }
246
247 static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
248 struct device_node *np,
249 struct pinctrl_map **map, unsigned *num_maps)
250 {
251 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
252 const struct at91_pin_group *grp;
253 struct pinctrl_map *new_map;
254 struct device_node *parent;
255 int map_num = 1;
256 int i;
257
258 /*
259 * first find the group of this node and check if we need to create
260 * config maps for pins
261 */
262 grp = at91_pinctrl_find_group_by_name(info, np->name);
263 if (!grp) {
264 dev_err(info->dev, "unable to find group for node %s\n",
265 np->name);
266 return -EINVAL;
267 }
268
269 map_num += grp->npins;
270 new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, GFP_KERNEL);
271 if (!new_map)
272 return -ENOMEM;
273
274 *map = new_map;
275 *num_maps = map_num;
276
277 /* create mux map */
278 parent = of_get_parent(np);
279 if (!parent) {
280 devm_kfree(pctldev->dev, new_map);
281 return -EINVAL;
282 }
283 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
284 new_map[0].data.mux.function = parent->name;
285 new_map[0].data.mux.group = np->name;
286 of_node_put(parent);
287
288 /* create config map */
289 new_map++;
290 for (i = 0; i < grp->npins; i++) {
291 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
292 new_map[i].data.configs.group_or_pin =
293 pin_get_name(pctldev, grp->pins[i]);
294 new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
295 new_map[i].data.configs.num_configs = 1;
296 }
297
298 dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
299 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
300
301 return 0;
302 }
303
304 static void at91_dt_free_map(struct pinctrl_dev *pctldev,
305 struct pinctrl_map *map, unsigned num_maps)
306 {
307 }
308
309 static const struct pinctrl_ops at91_pctrl_ops = {
310 .get_groups_count = at91_get_groups_count,
311 .get_group_name = at91_get_group_name,
312 .get_group_pins = at91_get_group_pins,
313 .pin_dbg_show = at91_pin_dbg_show,
314 .dt_node_to_map = at91_dt_node_to_map,
315 .dt_free_map = at91_dt_free_map,
316 };
317
318 static void __iomem *pin_to_controller(struct at91_pinctrl *info,
319 unsigned int bank)
320 {
321 if (!gpio_chips[bank])
322 return NULL;
323
324 return gpio_chips[bank]->regbase;
325 }
326
327 static inline int pin_to_bank(unsigned pin)
328 {
329 return pin /= MAX_NB_GPIO_PER_BANK;
330 }
331
332 static unsigned pin_to_mask(unsigned int pin)
333 {
334 return 1 << pin;
335 }
336
337 static unsigned two_bit_pin_value_shift_amount(unsigned int pin)
338 {
339 /* return the shift value for a pin for "two bit" per pin registers,
340 * i.e. drive strength */
341 return 2*((pin >= MAX_NB_GPIO_PER_BANK/2)
342 ? pin - MAX_NB_GPIO_PER_BANK/2 : pin);
343 }
344
345 static unsigned sama5d3_get_drive_register(unsigned int pin)
346 {
347 /* drive strength is split between two registers
348 * with two bits per pin */
349 return (pin >= MAX_NB_GPIO_PER_BANK/2)
350 ? SAMA5D3_PIO_DRIVER2 : SAMA5D3_PIO_DRIVER1;
351 }
352
353 static unsigned at91sam9x5_get_drive_register(unsigned int pin)
354 {
355 /* drive strength is split between two registers
356 * with two bits per pin */
357 return (pin >= MAX_NB_GPIO_PER_BANK/2)
358 ? AT91SAM9X5_PIO_DRIVER2 : AT91SAM9X5_PIO_DRIVER1;
359 }
360
361 static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
362 {
363 writel_relaxed(mask, pio + PIO_IDR);
364 }
365
366 static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
367 {
368 return !((readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1);
369 }
370
371 static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
372 {
373 if (on)
374 writel_relaxed(mask, pio + PIO_PPDDR);
375
376 writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
377 }
378
379 static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
380 {
381 return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
382 }
383
384 static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
385 {
386 writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
387 }
388
389 static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
390 {
391 writel_relaxed(mask, pio + PIO_ASR);
392 }
393
394 static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
395 {
396 writel_relaxed(mask, pio + PIO_BSR);
397 }
398
399 static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
400 {
401
402 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
403 pio + PIO_ABCDSR1);
404 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
405 pio + PIO_ABCDSR2);
406 }
407
408 static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
409 {
410 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
411 pio + PIO_ABCDSR1);
412 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
413 pio + PIO_ABCDSR2);
414 }
415
416 static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
417 {
418 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
419 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
420 }
421
422 static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
423 {
424 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
425 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
426 }
427
428 static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
429 {
430 unsigned select;
431
432 if (readl_relaxed(pio + PIO_PSR) & mask)
433 return AT91_MUX_GPIO;
434
435 select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
436 select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
437
438 return select + 1;
439 }
440
441 static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
442 {
443 unsigned select;
444
445 if (readl_relaxed(pio + PIO_PSR) & mask)
446 return AT91_MUX_GPIO;
447
448 select = readl_relaxed(pio + PIO_ABSR) & mask;
449
450 return select + 1;
451 }
452
453 static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
454 {
455 return (readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1;
456 }
457
458 static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
459 {
460 writel_relaxed(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
461 }
462
463 static bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
464 {
465 if ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1)
466 return !((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
467
468 return false;
469 }
470
471 static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
472 {
473 if (is_on)
474 writel_relaxed(mask, pio + PIO_IFSCDR);
475 at91_mux_set_deglitch(pio, mask, is_on);
476 }
477
478 static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
479 {
480 *div = readl_relaxed(pio + PIO_SCDR);
481
482 return ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1) &&
483 ((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
484 }
485
486 static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
487 bool is_on, u32 div)
488 {
489 if (is_on) {
490 writel_relaxed(mask, pio + PIO_IFSCER);
491 writel_relaxed(div & PIO_SCDR_DIV, pio + PIO_SCDR);
492 writel_relaxed(mask, pio + PIO_IFER);
493 } else
494 writel_relaxed(mask, pio + PIO_IFSCDR);
495 }
496
497 static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
498 {
499 return !((readl_relaxed(pio + PIO_PPDSR) >> pin) & 0x1);
500 }
501
502 static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
503 {
504 if (is_on)
505 writel_relaxed(mask, pio + PIO_PUDR);
506
507 writel_relaxed(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
508 }
509
510 static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
511 {
512 writel_relaxed(readl_relaxed(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
513 }
514
515 static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
516 {
517 return (readl_relaxed(pio + PIO_SCHMITT) >> pin) & 0x1;
518 }
519
520 static inline u32 read_drive_strength(void __iomem *reg, unsigned pin)
521 {
522 unsigned tmp = readl_relaxed(reg);
523
524 tmp = tmp >> two_bit_pin_value_shift_amount(pin);
525
526 return tmp & DRIVE_STRENGTH_MASK;
527 }
528
529 static unsigned at91_mux_sama5d3_get_drivestrength(void __iomem *pio,
530 unsigned pin)
531 {
532 unsigned tmp = read_drive_strength(pio +
533 sama5d3_get_drive_register(pin), pin);
534
535 /* SAMA5 strength is 1:1 with our defines,
536 * except 0 is equivalent to low per datasheet */
537 if (!tmp)
538 tmp = DRIVE_STRENGTH_LOW;
539
540 return tmp;
541 }
542
543 static unsigned at91_mux_sam9x5_get_drivestrength(void __iomem *pio,
544 unsigned pin)
545 {
546 unsigned tmp = read_drive_strength(pio +
547 at91sam9x5_get_drive_register(pin), pin);
548
549 /* strength is inverse in SAM9x5s hardware with the pinctrl defines
550 * hardware: 0 = hi, 1 = med, 2 = low, 3 = rsvd */
551 tmp = DRIVE_STRENGTH_HI - tmp;
552
553 return tmp;
554 }
555
556 static void set_drive_strength(void __iomem *reg, unsigned pin, u32 strength)
557 {
558 unsigned tmp = readl_relaxed(reg);
559 unsigned shift = two_bit_pin_value_shift_amount(pin);
560
561 tmp &= ~(DRIVE_STRENGTH_MASK << shift);
562 tmp |= strength << shift;
563
564 writel_relaxed(tmp, reg);
565 }
566
567 static void at91_mux_sama5d3_set_drivestrength(void __iomem *pio, unsigned pin,
568 u32 setting)
569 {
570 /* do nothing if setting is zero */
571 if (!setting)
572 return;
573
574 /* strength is 1 to 1 with setting for SAMA5 */
575 set_drive_strength(pio + sama5d3_get_drive_register(pin), pin, setting);
576 }
577
578 static void at91_mux_sam9x5_set_drivestrength(void __iomem *pio, unsigned pin,
579 u32 setting)
580 {
581 /* do nothing if setting is zero */
582 if (!setting)
583 return;
584
585 /* strength is inverse on SAM9x5s with our defines
586 * 0 = hi, 1 = med, 2 = low, 3 = rsvd */
587 setting = DRIVE_STRENGTH_HI - setting;
588
589 set_drive_strength(pio + at91sam9x5_get_drive_register(pin), pin,
590 setting);
591 }
592
593 static struct at91_pinctrl_mux_ops at91rm9200_ops = {
594 .get_periph = at91_mux_get_periph,
595 .mux_A_periph = at91_mux_set_A_periph,
596 .mux_B_periph = at91_mux_set_B_periph,
597 .get_deglitch = at91_mux_get_deglitch,
598 .set_deglitch = at91_mux_set_deglitch,
599 .irq_type = gpio_irq_type,
600 };
601
602 static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
603 .get_periph = at91_mux_pio3_get_periph,
604 .mux_A_periph = at91_mux_pio3_set_A_periph,
605 .mux_B_periph = at91_mux_pio3_set_B_periph,
606 .mux_C_periph = at91_mux_pio3_set_C_periph,
607 .mux_D_periph = at91_mux_pio3_set_D_periph,
608 .get_deglitch = at91_mux_pio3_get_deglitch,
609 .set_deglitch = at91_mux_pio3_set_deglitch,
610 .get_debounce = at91_mux_pio3_get_debounce,
611 .set_debounce = at91_mux_pio3_set_debounce,
612 .get_pulldown = at91_mux_pio3_get_pulldown,
613 .set_pulldown = at91_mux_pio3_set_pulldown,
614 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
615 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
616 .get_drivestrength = at91_mux_sam9x5_get_drivestrength,
617 .set_drivestrength = at91_mux_sam9x5_set_drivestrength,
618 .irq_type = alt_gpio_irq_type,
619 };
620
621 static struct at91_pinctrl_mux_ops sama5d3_ops = {
622 .get_periph = at91_mux_pio3_get_periph,
623 .mux_A_periph = at91_mux_pio3_set_A_periph,
624 .mux_B_periph = at91_mux_pio3_set_B_periph,
625 .mux_C_periph = at91_mux_pio3_set_C_periph,
626 .mux_D_periph = at91_mux_pio3_set_D_periph,
627 .get_deglitch = at91_mux_pio3_get_deglitch,
628 .set_deglitch = at91_mux_pio3_set_deglitch,
629 .get_debounce = at91_mux_pio3_get_debounce,
630 .set_debounce = at91_mux_pio3_set_debounce,
631 .get_pulldown = at91_mux_pio3_get_pulldown,
632 .set_pulldown = at91_mux_pio3_set_pulldown,
633 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
634 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
635 .get_drivestrength = at91_mux_sama5d3_get_drivestrength,
636 .set_drivestrength = at91_mux_sama5d3_set_drivestrength,
637 .irq_type = alt_gpio_irq_type,
638 };
639
640 static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
641 {
642 if (pin->mux) {
643 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lx\n",
644 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
645 } else {
646 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lx\n",
647 pin->bank + 'A', pin->pin, pin->conf);
648 }
649 }
650
651 static int pin_check_config(struct at91_pinctrl *info, const char *name,
652 int index, const struct at91_pmx_pin *pin)
653 {
654 int mux;
655
656 /* check if it's a valid config */
657 if (pin->bank >= gpio_banks) {
658 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
659 name, index, pin->bank, gpio_banks);
660 return -EINVAL;
661 }
662
663 if (!gpio_chips[pin->bank]) {
664 dev_err(info->dev, "%s: pin conf %d bank_id %d not enabled\n",
665 name, index, pin->bank);
666 return -ENXIO;
667 }
668
669 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
670 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
671 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
672 return -EINVAL;
673 }
674
675 if (!pin->mux)
676 return 0;
677
678 mux = pin->mux - 1;
679
680 if (mux >= info->nmux) {
681 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
682 name, index, mux, info->nmux);
683 return -EINVAL;
684 }
685
686 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
687 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
688 name, index, mux, pin->bank + 'A', pin->pin);
689 return -EINVAL;
690 }
691
692 return 0;
693 }
694
695 static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
696 {
697 writel_relaxed(mask, pio + PIO_PDR);
698 }
699
700 static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
701 {
702 writel_relaxed(mask, pio + PIO_PER);
703 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
704 }
705
706 static int at91_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
707 unsigned group)
708 {
709 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
710 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
711 const struct at91_pmx_pin *pin;
712 uint32_t npins = info->groups[group].npins;
713 int i, ret;
714 unsigned mask;
715 void __iomem *pio;
716
717 dev_dbg(info->dev, "enable function %s group %s\n",
718 info->functions[selector].name, info->groups[group].name);
719
720 /* first check that all the pins of the group are valid with a valid
721 * parameter */
722 for (i = 0; i < npins; i++) {
723 pin = &pins_conf[i];
724 ret = pin_check_config(info, info->groups[group].name, i, pin);
725 if (ret)
726 return ret;
727 }
728
729 for (i = 0; i < npins; i++) {
730 pin = &pins_conf[i];
731 at91_pin_dbg(info->dev, pin);
732 pio = pin_to_controller(info, pin->bank);
733
734 if (!pio)
735 continue;
736
737 mask = pin_to_mask(pin->pin);
738 at91_mux_disable_interrupt(pio, mask);
739 switch (pin->mux) {
740 case AT91_MUX_GPIO:
741 at91_mux_gpio_enable(pio, mask, 1);
742 break;
743 case AT91_MUX_PERIPH_A:
744 info->ops->mux_A_periph(pio, mask);
745 break;
746 case AT91_MUX_PERIPH_B:
747 info->ops->mux_B_periph(pio, mask);
748 break;
749 case AT91_MUX_PERIPH_C:
750 if (!info->ops->mux_C_periph)
751 return -EINVAL;
752 info->ops->mux_C_periph(pio, mask);
753 break;
754 case AT91_MUX_PERIPH_D:
755 if (!info->ops->mux_D_periph)
756 return -EINVAL;
757 info->ops->mux_D_periph(pio, mask);
758 break;
759 }
760 if (pin->mux)
761 at91_mux_gpio_disable(pio, mask);
762 }
763
764 return 0;
765 }
766
767 static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
768 {
769 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
770
771 return info->nfunctions;
772 }
773
774 static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
775 unsigned selector)
776 {
777 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
778
779 return info->functions[selector].name;
780 }
781
782 static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
783 const char * const **groups,
784 unsigned * const num_groups)
785 {
786 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
787
788 *groups = info->functions[selector].groups;
789 *num_groups = info->functions[selector].ngroups;
790
791 return 0;
792 }
793
794 static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
795 struct pinctrl_gpio_range *range,
796 unsigned offset)
797 {
798 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
799 struct at91_gpio_chip *at91_chip;
800 struct gpio_chip *chip;
801 unsigned mask;
802
803 if (!range) {
804 dev_err(npct->dev, "invalid range\n");
805 return -EINVAL;
806 }
807 if (!range->gc) {
808 dev_err(npct->dev, "missing GPIO chip in range\n");
809 return -EINVAL;
810 }
811 chip = range->gc;
812 at91_chip = gpiochip_get_data(chip);
813
814 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
815
816 mask = 1 << (offset - chip->base);
817
818 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
819 offset, 'A' + range->id, offset - chip->base, mask);
820
821 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
822
823 return 0;
824 }
825
826 static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
827 struct pinctrl_gpio_range *range,
828 unsigned offset)
829 {
830 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
831
832 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
833 /* Set the pin to some default state, GPIO is usually default */
834 }
835
836 static const struct pinmux_ops at91_pmx_ops = {
837 .get_functions_count = at91_pmx_get_funcs_count,
838 .get_function_name = at91_pmx_get_func_name,
839 .get_function_groups = at91_pmx_get_groups,
840 .set_mux = at91_pmx_set,
841 .gpio_request_enable = at91_gpio_request_enable,
842 .gpio_disable_free = at91_gpio_disable_free,
843 };
844
845 static int at91_pinconf_get(struct pinctrl_dev *pctldev,
846 unsigned pin_id, unsigned long *config)
847 {
848 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
849 void __iomem *pio;
850 unsigned pin;
851 int div;
852
853 *config = 0;
854 dev_dbg(info->dev, "%s:%d, pin_id=%d", __func__, __LINE__, pin_id);
855 pio = pin_to_controller(info, pin_to_bank(pin_id));
856
857 if (!pio)
858 return -EINVAL;
859
860 pin = pin_id % MAX_NB_GPIO_PER_BANK;
861
862 if (at91_mux_get_multidrive(pio, pin))
863 *config |= MULTI_DRIVE;
864
865 if (at91_mux_get_pullup(pio, pin))
866 *config |= PULL_UP;
867
868 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
869 *config |= DEGLITCH;
870 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
871 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
872 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
873 *config |= PULL_DOWN;
874 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
875 *config |= DIS_SCHMIT;
876 if (info->ops->get_drivestrength)
877 *config |= (info->ops->get_drivestrength(pio, pin)
878 << DRIVE_STRENGTH_SHIFT);
879
880 return 0;
881 }
882
883 static int at91_pinconf_set(struct pinctrl_dev *pctldev,
884 unsigned pin_id, unsigned long *configs,
885 unsigned num_configs)
886 {
887 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
888 unsigned mask;
889 void __iomem *pio;
890 int i;
891 unsigned long config;
892 unsigned pin;
893
894 for (i = 0; i < num_configs; i++) {
895 config = configs[i];
896
897 dev_dbg(info->dev,
898 "%s:%d, pin_id=%d, config=0x%lx",
899 __func__, __LINE__, pin_id, config);
900 pio = pin_to_controller(info, pin_to_bank(pin_id));
901
902 if (!pio)
903 return -EINVAL;
904
905 pin = pin_id % MAX_NB_GPIO_PER_BANK;
906 mask = pin_to_mask(pin);
907
908 if (config & PULL_UP && config & PULL_DOWN)
909 return -EINVAL;
910
911 at91_mux_set_pullup(pio, mask, config & PULL_UP);
912 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
913 if (info->ops->set_deglitch)
914 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
915 if (info->ops->set_debounce)
916 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
917 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
918 if (info->ops->set_pulldown)
919 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
920 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
921 info->ops->disable_schmitt_trig(pio, mask);
922 if (info->ops->set_drivestrength)
923 info->ops->set_drivestrength(pio, pin,
924 (config & DRIVE_STRENGTH)
925 >> DRIVE_STRENGTH_SHIFT);
926
927 } /* for each config */
928
929 return 0;
930 }
931
932 #define DBG_SHOW_FLAG(flag) do { \
933 if (config & flag) { \
934 if (num_conf) \
935 seq_puts(s, "|"); \
936 seq_puts(s, #flag); \
937 num_conf++; \
938 } \
939 } while (0)
940
941 #define DBG_SHOW_FLAG_MASKED(mask,flag) do { \
942 if ((config & mask) == flag) { \
943 if (num_conf) \
944 seq_puts(s, "|"); \
945 seq_puts(s, #flag); \
946 num_conf++; \
947 } \
948 } while (0)
949
950 static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
951 struct seq_file *s, unsigned pin_id)
952 {
953 unsigned long config;
954 int val, num_conf = 0;
955
956 at91_pinconf_get(pctldev, pin_id, &config);
957
958 DBG_SHOW_FLAG(MULTI_DRIVE);
959 DBG_SHOW_FLAG(PULL_UP);
960 DBG_SHOW_FLAG(PULL_DOWN);
961 DBG_SHOW_FLAG(DIS_SCHMIT);
962 DBG_SHOW_FLAG(DEGLITCH);
963 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_LOW);
964 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_MED);
965 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_HI);
966 DBG_SHOW_FLAG(DEBOUNCE);
967 if (config & DEBOUNCE) {
968 val = config >> DEBOUNCE_VAL_SHIFT;
969 seq_printf(s, "(%d)", val);
970 }
971
972 return;
973 }
974
975 static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
976 struct seq_file *s, unsigned group)
977 {
978 }
979
980 static const struct pinconf_ops at91_pinconf_ops = {
981 .pin_config_get = at91_pinconf_get,
982 .pin_config_set = at91_pinconf_set,
983 .pin_config_dbg_show = at91_pinconf_dbg_show,
984 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
985 };
986
987 static struct pinctrl_desc at91_pinctrl_desc = {
988 .pctlops = &at91_pctrl_ops,
989 .pmxops = &at91_pmx_ops,
990 .confops = &at91_pinconf_ops,
991 .owner = THIS_MODULE,
992 };
993
994 static const char *gpio_compat = "atmel,at91rm9200-gpio";
995
996 static void at91_pinctrl_child_count(struct at91_pinctrl *info,
997 struct device_node *np)
998 {
999 struct device_node *child;
1000
1001 for_each_child_of_node(np, child) {
1002 if (of_device_is_compatible(child, gpio_compat)) {
1003 if (of_device_is_available(child))
1004 info->nactive_banks++;
1005 } else {
1006 info->nfunctions++;
1007 info->ngroups += of_get_child_count(child);
1008 }
1009 }
1010 }
1011
1012 static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
1013 struct device_node *np)
1014 {
1015 int ret = 0;
1016 int size;
1017 const __be32 *list;
1018
1019 list = of_get_property(np, "atmel,mux-mask", &size);
1020 if (!list) {
1021 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
1022 return -EINVAL;
1023 }
1024
1025 size /= sizeof(*list);
1026 if (!size || size % gpio_banks) {
1027 dev_err(info->dev, "wrong mux mask array should be by %d\n", gpio_banks);
1028 return -EINVAL;
1029 }
1030 info->nmux = size / gpio_banks;
1031
1032 info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL);
1033 if (!info->mux_mask) {
1034 dev_err(info->dev, "could not alloc mux_mask\n");
1035 return -ENOMEM;
1036 }
1037
1038 ret = of_property_read_u32_array(np, "atmel,mux-mask",
1039 info->mux_mask, size);
1040 if (ret)
1041 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
1042 return ret;
1043 }
1044
1045 static int at91_pinctrl_parse_groups(struct device_node *np,
1046 struct at91_pin_group *grp,
1047 struct at91_pinctrl *info, u32 index)
1048 {
1049 struct at91_pmx_pin *pin;
1050 int size;
1051 const __be32 *list;
1052 int i, j;
1053
1054 dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
1055
1056 /* Initialise group */
1057 grp->name = np->name;
1058
1059 /*
1060 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
1061 * do sanity check and calculate pins number
1062 */
1063 list = of_get_property(np, "atmel,pins", &size);
1064 /* we do not check return since it's safe node passed down */
1065 size /= sizeof(*list);
1066 if (!size || size % 4) {
1067 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
1068 return -EINVAL;
1069 }
1070
1071 grp->npins = size / 4;
1072 pin = grp->pins_conf = devm_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin),
1073 GFP_KERNEL);
1074 grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
1075 GFP_KERNEL);
1076 if (!grp->pins_conf || !grp->pins)
1077 return -ENOMEM;
1078
1079 for (i = 0, j = 0; i < size; i += 4, j++) {
1080 pin->bank = be32_to_cpu(*list++);
1081 pin->pin = be32_to_cpu(*list++);
1082 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
1083 pin->mux = be32_to_cpu(*list++);
1084 pin->conf = be32_to_cpu(*list++);
1085
1086 at91_pin_dbg(info->dev, pin);
1087 pin++;
1088 }
1089
1090 return 0;
1091 }
1092
1093 static int at91_pinctrl_parse_functions(struct device_node *np,
1094 struct at91_pinctrl *info, u32 index)
1095 {
1096 struct device_node *child;
1097 struct at91_pmx_func *func;
1098 struct at91_pin_group *grp;
1099 int ret;
1100 static u32 grp_index;
1101 u32 i = 0;
1102
1103 dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
1104
1105 func = &info->functions[index];
1106
1107 /* Initialise function */
1108 func->name = np->name;
1109 func->ngroups = of_get_child_count(np);
1110 if (func->ngroups == 0) {
1111 dev_err(info->dev, "no groups defined\n");
1112 return -EINVAL;
1113 }
1114 func->groups = devm_kzalloc(info->dev,
1115 func->ngroups * sizeof(char *), GFP_KERNEL);
1116 if (!func->groups)
1117 return -ENOMEM;
1118
1119 for_each_child_of_node(np, child) {
1120 func->groups[i] = child->name;
1121 grp = &info->groups[grp_index++];
1122 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
1123 if (ret) {
1124 of_node_put(child);
1125 return ret;
1126 }
1127 }
1128
1129 return 0;
1130 }
1131
1132 static const struct of_device_id at91_pinctrl_of_match[] = {
1133 { .compatible = "atmel,sama5d3-pinctrl", .data = &sama5d3_ops },
1134 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
1135 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
1136 { /* sentinel */ }
1137 };
1138
1139 static int at91_pinctrl_probe_dt(struct platform_device *pdev,
1140 struct at91_pinctrl *info)
1141 {
1142 int ret = 0;
1143 int i, j;
1144 uint32_t *tmp;
1145 struct device_node *np = pdev->dev.of_node;
1146 struct device_node *child;
1147
1148 if (!np)
1149 return -ENODEV;
1150
1151 info->dev = &pdev->dev;
1152 info->ops = (struct at91_pinctrl_mux_ops *)
1153 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
1154 at91_pinctrl_child_count(info, np);
1155
1156 if (gpio_banks < 1) {
1157 dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n");
1158 return -EINVAL;
1159 }
1160
1161 ret = at91_pinctrl_mux_mask(info, np);
1162 if (ret)
1163 return ret;
1164
1165 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
1166
1167 dev_dbg(&pdev->dev, "mux-mask\n");
1168 tmp = info->mux_mask;
1169 for (i = 0; i < gpio_banks; i++) {
1170 for (j = 0; j < info->nmux; j++, tmp++) {
1171 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
1172 }
1173 }
1174
1175 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1176 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1177 info->functions = devm_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func),
1178 GFP_KERNEL);
1179 if (!info->functions)
1180 return -ENOMEM;
1181
1182 info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct at91_pin_group),
1183 GFP_KERNEL);
1184 if (!info->groups)
1185 return -ENOMEM;
1186
1187 dev_dbg(&pdev->dev, "nbanks = %d\n", gpio_banks);
1188 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1189 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1190
1191 i = 0;
1192
1193 for_each_child_of_node(np, child) {
1194 if (of_device_is_compatible(child, gpio_compat))
1195 continue;
1196 ret = at91_pinctrl_parse_functions(child, info, i++);
1197 if (ret) {
1198 dev_err(&pdev->dev, "failed to parse function\n");
1199 of_node_put(child);
1200 return ret;
1201 }
1202 }
1203
1204 return 0;
1205 }
1206
1207 static int at91_pinctrl_probe(struct platform_device *pdev)
1208 {
1209 struct at91_pinctrl *info;
1210 struct pinctrl_pin_desc *pdesc;
1211 int ret, i, j, k, ngpio_chips_enabled = 0;
1212
1213 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1214 if (!info)
1215 return -ENOMEM;
1216
1217 ret = at91_pinctrl_probe_dt(pdev, info);
1218 if (ret)
1219 return ret;
1220
1221 /*
1222 * We need all the GPIO drivers to probe FIRST, or we will not be able
1223 * to obtain references to the struct gpio_chip * for them, and we
1224 * need this to proceed.
1225 */
1226 for (i = 0; i < gpio_banks; i++)
1227 if (gpio_chips[i])
1228 ngpio_chips_enabled++;
1229
1230 if (ngpio_chips_enabled < info->nactive_banks) {
1231 dev_warn(&pdev->dev,
1232 "All GPIO chips are not registered yet (%d/%d)\n",
1233 ngpio_chips_enabled, info->nactive_banks);
1234 devm_kfree(&pdev->dev, info);
1235 return -EPROBE_DEFER;
1236 }
1237
1238 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1239 at91_pinctrl_desc.npins = gpio_banks * MAX_NB_GPIO_PER_BANK;
1240 at91_pinctrl_desc.pins = pdesc =
1241 devm_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, GFP_KERNEL);
1242
1243 if (!at91_pinctrl_desc.pins)
1244 return -ENOMEM;
1245
1246 for (i = 0, k = 0; i < gpio_banks; i++) {
1247 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1248 pdesc->number = k;
1249 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1250 pdesc++;
1251 }
1252 }
1253
1254 platform_set_drvdata(pdev, info);
1255 info->pctl = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, info);
1256
1257 if (IS_ERR(info->pctl)) {
1258 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1259 return PTR_ERR(info->pctl);
1260 }
1261
1262 /* We will handle a range of GPIO pins */
1263 for (i = 0; i < gpio_banks; i++)
1264 if (gpio_chips[i])
1265 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1266
1267 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1268
1269 return 0;
1270 }
1271
1272 static int at91_pinctrl_remove(struct platform_device *pdev)
1273 {
1274 struct at91_pinctrl *info = platform_get_drvdata(pdev);
1275
1276 pinctrl_unregister(info->pctl);
1277
1278 return 0;
1279 }
1280
1281 static int at91_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
1282 {
1283 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1284 void __iomem *pio = at91_gpio->regbase;
1285 unsigned mask = 1 << offset;
1286 u32 osr;
1287
1288 osr = readl_relaxed(pio + PIO_OSR);
1289 return !(osr & mask);
1290 }
1291
1292 static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1293 {
1294 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1295 void __iomem *pio = at91_gpio->regbase;
1296 unsigned mask = 1 << offset;
1297
1298 writel_relaxed(mask, pio + PIO_ODR);
1299 return 0;
1300 }
1301
1302 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1303 {
1304 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1305 void __iomem *pio = at91_gpio->regbase;
1306 unsigned mask = 1 << offset;
1307 u32 pdsr;
1308
1309 pdsr = readl_relaxed(pio + PIO_PDSR);
1310 return (pdsr & mask) != 0;
1311 }
1312
1313 static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1314 int val)
1315 {
1316 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1317 void __iomem *pio = at91_gpio->regbase;
1318 unsigned mask = 1 << offset;
1319
1320 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1321 }
1322
1323 static void at91_gpio_set_multiple(struct gpio_chip *chip,
1324 unsigned long *mask, unsigned long *bits)
1325 {
1326 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1327 void __iomem *pio = at91_gpio->regbase;
1328
1329 #define BITS_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
1330 /* Mask additionally to ngpio as not all GPIO controllers have 32 pins */
1331 uint32_t set_mask = (*mask & *bits) & BITS_MASK(chip->ngpio);
1332 uint32_t clear_mask = (*mask & ~(*bits)) & BITS_MASK(chip->ngpio);
1333
1334 writel_relaxed(set_mask, pio + PIO_SODR);
1335 writel_relaxed(clear_mask, pio + PIO_CODR);
1336 }
1337
1338 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1339 int val)
1340 {
1341 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1342 void __iomem *pio = at91_gpio->regbase;
1343 unsigned mask = 1 << offset;
1344
1345 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1346 writel_relaxed(mask, pio + PIO_OER);
1347
1348 return 0;
1349 }
1350
1351 #ifdef CONFIG_DEBUG_FS
1352 static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1353 {
1354 enum at91_mux mode;
1355 int i;
1356 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1357 void __iomem *pio = at91_gpio->regbase;
1358
1359 for (i = 0; i < chip->ngpio; i++) {
1360 unsigned mask = pin_to_mask(i);
1361 const char *gpio_label;
1362
1363 gpio_label = gpiochip_is_requested(chip, i);
1364 if (!gpio_label)
1365 continue;
1366 mode = at91_gpio->ops->get_periph(pio, mask);
1367 seq_printf(s, "[%s] GPIO%s%d: ",
1368 gpio_label, chip->label, i);
1369 if (mode == AT91_MUX_GPIO) {
1370 seq_printf(s, "[gpio] ");
1371 seq_printf(s, "%s ",
1372 readl_relaxed(pio + PIO_OSR) & mask ?
1373 "output" : "input");
1374 seq_printf(s, "%s\n",
1375 readl_relaxed(pio + PIO_PDSR) & mask ?
1376 "set" : "clear");
1377 } else {
1378 seq_printf(s, "[periph %c]\n",
1379 mode + 'A' - 1);
1380 }
1381 }
1382 }
1383 #else
1384 #define at91_gpio_dbg_show NULL
1385 #endif
1386
1387 /* Several AIC controller irqs are dispatched through this GPIO handler.
1388 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1389 * at91_set_gpio_input() then maybe enable its glitch filter.
1390 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1391 * handler.
1392 * First implementation always triggers on rising and falling edges
1393 * whereas the newer PIO3 can be additionally configured to trigger on
1394 * level, edge with any polarity.
1395 *
1396 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1397 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1398 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1399 */
1400
1401 static void gpio_irq_mask(struct irq_data *d)
1402 {
1403 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1404 void __iomem *pio = at91_gpio->regbase;
1405 unsigned mask = 1 << d->hwirq;
1406
1407 if (pio)
1408 writel_relaxed(mask, pio + PIO_IDR);
1409 }
1410
1411 static void gpio_irq_unmask(struct irq_data *d)
1412 {
1413 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1414 void __iomem *pio = at91_gpio->regbase;
1415 unsigned mask = 1 << d->hwirq;
1416
1417 if (pio)
1418 writel_relaxed(mask, pio + PIO_IER);
1419 }
1420
1421 static int gpio_irq_type(struct irq_data *d, unsigned type)
1422 {
1423 switch (type) {
1424 case IRQ_TYPE_NONE:
1425 case IRQ_TYPE_EDGE_BOTH:
1426 return 0;
1427 default:
1428 return -EINVAL;
1429 }
1430 }
1431
1432 /* Alternate irq type for PIO3 support */
1433 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1434 {
1435 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1436 void __iomem *pio = at91_gpio->regbase;
1437 unsigned mask = 1 << d->hwirq;
1438
1439 switch (type) {
1440 case IRQ_TYPE_EDGE_RISING:
1441 irq_set_handler_locked(d, handle_simple_irq);
1442 writel_relaxed(mask, pio + PIO_ESR);
1443 writel_relaxed(mask, pio + PIO_REHLSR);
1444 break;
1445 case IRQ_TYPE_EDGE_FALLING:
1446 irq_set_handler_locked(d, handle_simple_irq);
1447 writel_relaxed(mask, pio + PIO_ESR);
1448 writel_relaxed(mask, pio + PIO_FELLSR);
1449 break;
1450 case IRQ_TYPE_LEVEL_LOW:
1451 irq_set_handler_locked(d, handle_level_irq);
1452 writel_relaxed(mask, pio + PIO_LSR);
1453 writel_relaxed(mask, pio + PIO_FELLSR);
1454 break;
1455 case IRQ_TYPE_LEVEL_HIGH:
1456 irq_set_handler_locked(d, handle_level_irq);
1457 writel_relaxed(mask, pio + PIO_LSR);
1458 writel_relaxed(mask, pio + PIO_REHLSR);
1459 break;
1460 case IRQ_TYPE_EDGE_BOTH:
1461 /*
1462 * disable additional interrupt modes:
1463 * fall back to default behavior
1464 */
1465 irq_set_handler_locked(d, handle_simple_irq);
1466 writel_relaxed(mask, pio + PIO_AIMDR);
1467 return 0;
1468 case IRQ_TYPE_NONE:
1469 default:
1470 pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq));
1471 return -EINVAL;
1472 }
1473
1474 /* enable additional interrupt modes */
1475 writel_relaxed(mask, pio + PIO_AIMER);
1476
1477 return 0;
1478 }
1479
1480 static void gpio_irq_ack(struct irq_data *d)
1481 {
1482 /* the interrupt is already cleared before by reading ISR */
1483 }
1484
1485 #ifdef CONFIG_PM
1486
1487 static u32 wakeups[MAX_GPIO_BANKS];
1488 static u32 backups[MAX_GPIO_BANKS];
1489
1490 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1491 {
1492 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1493 unsigned bank = at91_gpio->pioc_idx;
1494 unsigned mask = 1 << d->hwirq;
1495
1496 if (unlikely(bank >= MAX_GPIO_BANKS))
1497 return -EINVAL;
1498
1499 if (state)
1500 wakeups[bank] |= mask;
1501 else
1502 wakeups[bank] &= ~mask;
1503
1504 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1505
1506 return 0;
1507 }
1508
1509 void at91_pinctrl_gpio_suspend(void)
1510 {
1511 int i;
1512
1513 for (i = 0; i < gpio_banks; i++) {
1514 void __iomem *pio;
1515
1516 if (!gpio_chips[i])
1517 continue;
1518
1519 pio = gpio_chips[i]->regbase;
1520
1521 backups[i] = readl_relaxed(pio + PIO_IMR);
1522 writel_relaxed(backups[i], pio + PIO_IDR);
1523 writel_relaxed(wakeups[i], pio + PIO_IER);
1524
1525 if (!wakeups[i])
1526 clk_disable_unprepare(gpio_chips[i]->clock);
1527 else
1528 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
1529 'A'+i, wakeups[i]);
1530 }
1531 }
1532
1533 void at91_pinctrl_gpio_resume(void)
1534 {
1535 int i;
1536
1537 for (i = 0; i < gpio_banks; i++) {
1538 void __iomem *pio;
1539
1540 if (!gpio_chips[i])
1541 continue;
1542
1543 pio = gpio_chips[i]->regbase;
1544
1545 if (!wakeups[i])
1546 clk_prepare_enable(gpio_chips[i]->clock);
1547
1548 writel_relaxed(wakeups[i], pio + PIO_IDR);
1549 writel_relaxed(backups[i], pio + PIO_IER);
1550 }
1551 }
1552
1553 #else
1554 #define gpio_irq_set_wake NULL
1555 #endif /* CONFIG_PM */
1556
1557 static struct irq_chip gpio_irqchip = {
1558 .name = "GPIO",
1559 .irq_ack = gpio_irq_ack,
1560 .irq_disable = gpio_irq_mask,
1561 .irq_mask = gpio_irq_mask,
1562 .irq_unmask = gpio_irq_unmask,
1563 /* .irq_set_type is set dynamically */
1564 .irq_set_wake = gpio_irq_set_wake,
1565 };
1566
1567 static void gpio_irq_handler(struct irq_desc *desc)
1568 {
1569 struct irq_chip *chip = irq_desc_get_chip(desc);
1570 struct gpio_chip *gpio_chip = irq_desc_get_handler_data(desc);
1571 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(gpio_chip);
1572 void __iomem *pio = at91_gpio->regbase;
1573 unsigned long isr;
1574 int n;
1575
1576 chained_irq_enter(chip, desc);
1577 for (;;) {
1578 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
1579 * When there are none pending, we're finished unless we need
1580 * to process multiple banks (like ID_PIOCDE on sam9263).
1581 */
1582 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1583 if (!isr) {
1584 if (!at91_gpio->next)
1585 break;
1586 at91_gpio = at91_gpio->next;
1587 pio = at91_gpio->regbase;
1588 gpio_chip = &at91_gpio->chip;
1589 continue;
1590 }
1591
1592 for_each_set_bit(n, &isr, BITS_PER_LONG) {
1593 generic_handle_irq(irq_find_mapping(
1594 gpio_chip->irqdomain, n));
1595 }
1596 }
1597 chained_irq_exit(chip, desc);
1598 /* now it may re-trigger */
1599 }
1600
1601 static int at91_gpio_of_irq_setup(struct platform_device *pdev,
1602 struct at91_gpio_chip *at91_gpio)
1603 {
1604 struct gpio_chip *gpiochip_prev = NULL;
1605 struct at91_gpio_chip *prev = NULL;
1606 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
1607 int ret, i;
1608
1609 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1610
1611 /* Setup proper .irq_set_type function */
1612 gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type;
1613
1614 /* Disable irqs of this PIO controller */
1615 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1616
1617 /*
1618 * Let the generic code handle this edge IRQ, the the chained
1619 * handler will perform the actual work of handling the parent
1620 * interrupt.
1621 */
1622 ret = gpiochip_irqchip_add(&at91_gpio->chip,
1623 &gpio_irqchip,
1624 0,
1625 handle_edge_irq,
1626 IRQ_TYPE_EDGE_BOTH);
1627 if (ret) {
1628 dev_err(&pdev->dev, "at91_gpio.%d: Couldn't add irqchip to gpiochip.\n",
1629 at91_gpio->pioc_idx);
1630 return ret;
1631 }
1632
1633 /* The top level handler handles one bank of GPIOs, except
1634 * on some SoC it can handle up to three...
1635 * We only set up the handler for the first of the list.
1636 */
1637 gpiochip_prev = irq_get_handler_data(at91_gpio->pioc_virq);
1638 if (!gpiochip_prev) {
1639 /* Then register the chain on the parent IRQ */
1640 gpiochip_set_chained_irqchip(&at91_gpio->chip,
1641 &gpio_irqchip,
1642 at91_gpio->pioc_virq,
1643 gpio_irq_handler);
1644 return 0;
1645 }
1646
1647 prev = gpiochip_get_data(gpiochip_prev);
1648
1649 /* we can only have 2 banks before */
1650 for (i = 0; i < 2; i++) {
1651 if (prev->next) {
1652 prev = prev->next;
1653 } else {
1654 prev->next = at91_gpio;
1655 return 0;
1656 }
1657 }
1658
1659 return -EINVAL;
1660 }
1661
1662 /* This structure is replicated for each GPIO block allocated at probe time */
1663 static struct gpio_chip at91_gpio_template = {
1664 .request = gpiochip_generic_request,
1665 .free = gpiochip_generic_free,
1666 .get_direction = at91_gpio_get_direction,
1667 .direction_input = at91_gpio_direction_input,
1668 .get = at91_gpio_get,
1669 .direction_output = at91_gpio_direction_output,
1670 .set = at91_gpio_set,
1671 .set_multiple = at91_gpio_set_multiple,
1672 .dbg_show = at91_gpio_dbg_show,
1673 .can_sleep = false,
1674 .ngpio = MAX_NB_GPIO_PER_BANK,
1675 };
1676
1677 static const struct of_device_id at91_gpio_of_match[] = {
1678 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1679 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1680 { /* sentinel */ }
1681 };
1682
1683 static int at91_gpio_probe(struct platform_device *pdev)
1684 {
1685 struct device_node *np = pdev->dev.of_node;
1686 struct resource *res;
1687 struct at91_gpio_chip *at91_chip = NULL;
1688 struct gpio_chip *chip;
1689 struct pinctrl_gpio_range *range;
1690 int ret = 0;
1691 int irq, i;
1692 int alias_idx = of_alias_get_id(np, "gpio");
1693 uint32_t ngpio;
1694 char **names;
1695
1696 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1697 if (gpio_chips[alias_idx]) {
1698 ret = -EBUSY;
1699 goto err;
1700 }
1701
1702 irq = platform_get_irq(pdev, 0);
1703 if (irq < 0) {
1704 ret = irq;
1705 goto err;
1706 }
1707
1708 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1709 if (!at91_chip) {
1710 ret = -ENOMEM;
1711 goto err;
1712 }
1713
1714 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1715 at91_chip->regbase = devm_ioremap_resource(&pdev->dev, res);
1716 if (IS_ERR(at91_chip->regbase)) {
1717 ret = PTR_ERR(at91_chip->regbase);
1718 goto err;
1719 }
1720
1721 at91_chip->ops = (struct at91_pinctrl_mux_ops *)
1722 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1723 at91_chip->pioc_virq = irq;
1724 at91_chip->pioc_idx = alias_idx;
1725
1726 at91_chip->clock = devm_clk_get(&pdev->dev, NULL);
1727 if (IS_ERR(at91_chip->clock)) {
1728 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1729 ret = PTR_ERR(at91_chip->clock);
1730 goto err;
1731 }
1732
1733 ret = clk_prepare(at91_chip->clock);
1734 if (ret)
1735 goto clk_prepare_err;
1736
1737 /* enable PIO controller's clock */
1738 ret = clk_enable(at91_chip->clock);
1739 if (ret) {
1740 dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
1741 goto clk_enable_err;
1742 }
1743
1744 at91_chip->chip = at91_gpio_template;
1745
1746 chip = &at91_chip->chip;
1747 chip->of_node = np;
1748 chip->label = dev_name(&pdev->dev);
1749 chip->parent = &pdev->dev;
1750 chip->owner = THIS_MODULE;
1751 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1752
1753 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1754 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1755 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1756 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1757 else
1758 chip->ngpio = ngpio;
1759 }
1760
1761 names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
1762 GFP_KERNEL);
1763
1764 if (!names) {
1765 ret = -ENOMEM;
1766 goto clk_enable_err;
1767 }
1768
1769 for (i = 0; i < chip->ngpio; i++)
1770 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1771
1772 chip->names = (const char *const *)names;
1773
1774 range = &at91_chip->range;
1775 range->name = chip->label;
1776 range->id = alias_idx;
1777 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1778
1779 range->npins = chip->ngpio;
1780 range->gc = chip;
1781
1782 ret = gpiochip_add_data(chip, at91_chip);
1783 if (ret)
1784 goto gpiochip_add_err;
1785
1786 gpio_chips[alias_idx] = at91_chip;
1787 gpio_banks = max(gpio_banks, alias_idx + 1);
1788
1789 ret = at91_gpio_of_irq_setup(pdev, at91_chip);
1790 if (ret)
1791 goto irq_setup_err;
1792
1793 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1794
1795 return 0;
1796
1797 irq_setup_err:
1798 gpiochip_remove(chip);
1799 gpiochip_add_err:
1800 clk_disable(at91_chip->clock);
1801 clk_enable_err:
1802 clk_unprepare(at91_chip->clock);
1803 clk_prepare_err:
1804 err:
1805 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1806
1807 return ret;
1808 }
1809
1810 static struct platform_driver at91_gpio_driver = {
1811 .driver = {
1812 .name = "gpio-at91",
1813 .of_match_table = at91_gpio_of_match,
1814 },
1815 .probe = at91_gpio_probe,
1816 };
1817
1818 static struct platform_driver at91_pinctrl_driver = {
1819 .driver = {
1820 .name = "pinctrl-at91",
1821 .of_match_table = at91_pinctrl_of_match,
1822 },
1823 .probe = at91_pinctrl_probe,
1824 .remove = at91_pinctrl_remove,
1825 };
1826
1827 static struct platform_driver * const drivers[] = {
1828 &at91_gpio_driver,
1829 &at91_pinctrl_driver,
1830 };
1831
1832 static int __init at91_pinctrl_init(void)
1833 {
1834 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1835 }
1836 arch_initcall(at91_pinctrl_init);
1837
1838 static void __exit at91_pinctrl_exit(void)
1839 {
1840 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
1841 }
1842
1843 module_exit(at91_pinctrl_exit);
1844 MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>");
1845 MODULE_DESCRIPTION("Atmel AT91 pinctrl driver");
1846 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support