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tuntap: switch to use rtnl_dereference()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / pinctrl / pinctrl-at91.c
blob471c71f7f8b611fb87e0d2330627801b5124288d
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/irq.h>
20 #include <linux/irqdomain.h>
21 #include <linux/io.h>
22 #include <linux/gpio.h>
23 #include <linux/pinctrl/machine.h>
24 #include <linux/pinctrl/pinconf.h>
25 #include <linux/pinctrl/pinctrl.h>
26 #include <linux/pinctrl/pinmux.h>
27 /* Since we request GPIOs from ourself */
28 #include <linux/pinctrl/consumer.h>
29
30 #include <asm/mach/irq.h>
31
32 #include <mach/hardware.h>
33 #include <mach/at91_pio.h>
34
35 #include "core.h"
36
37 #define MAX_NB_GPIO_PER_BANK 32
38
39 struct at91_pinctrl_mux_ops;
40
41 struct at91_gpio_chip {
42 struct gpio_chip chip;
43 struct pinctrl_gpio_range range;
44 struct at91_gpio_chip *next; /* Bank sharing same clock */
45 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
46 int pioc_virq; /* PIO bank Linux virtual interrupt */
47 int pioc_idx; /* PIO bank index */
48 void __iomem *regbase; /* PIO bank virtual address */
49 struct clk *clock; /* associated clock */
50 struct irq_domain *domain; /* associated irq domain */
51 struct at91_pinctrl_mux_ops *ops; /* ops */
52 };
53
54 #define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip)
55
56 static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
57
58 static int gpio_banks;
59
60 #define PULL_UP (1 << 0)
61 #define MULTI_DRIVE (1 << 1)
62 #define DEGLITCH (1 << 2)
63 #define PULL_DOWN (1 << 3)
64 #define DIS_SCHMIT (1 << 4)
65 #define DEBOUNCE (1 << 16)
66 #define DEBOUNCE_VAL_SHIFT 17
67 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
68
69 /**
70 * struct at91_pmx_func - describes AT91 pinmux functions
71 * @name: the name of this specific function
72 * @groups: corresponding pin groups
73 * @ngroups: the number of groups
74 */
75 struct at91_pmx_func {
76 const char *name;
77 const char **groups;
78 unsigned ngroups;
79 };
80
81 enum at91_mux {
82 AT91_MUX_GPIO = 0,
83 AT91_MUX_PERIPH_A = 1,
84 AT91_MUX_PERIPH_B = 2,
85 AT91_MUX_PERIPH_C = 3,
86 AT91_MUX_PERIPH_D = 4,
87 };
88
89 /**
90 * struct at91_pmx_pin - describes an At91 pin mux
91 * @bank: the bank of the pin
92 * @pin: the pin number in the @bank
93 * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
94 * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
95 */
96 struct at91_pmx_pin {
97 uint32_t bank;
98 uint32_t pin;
99 enum at91_mux mux;
100 unsigned long conf;
101 };
102
103 /**
104 * struct at91_pin_group - describes an At91 pin group
105 * @name: the name of this specific pin group
106 * @pins_conf: the mux mode for each pin in this group. The size of this
107 * array is the same as pins.
108 * @pins: an array of discrete physical pins used in this group, taken
109 * from the driver-local pin enumeration space
110 * @npins: the number of pins in this group array, i.e. the number of
111 * elements in .pins so we can iterate over that array
112 */
113 struct at91_pin_group {
114 const char *name;
115 struct at91_pmx_pin *pins_conf;
116 unsigned int *pins;
117 unsigned npins;
118 };
119
120 /**
121 * struct at91_pinctrl_mux_ops - describes an At91 mux ops group
122 * on new IP with support for periph C and D the way to mux in
123 * periph A and B has changed
124 * So provide the right call back
125 * if not present means the IP does not support it
126 * @get_periph: return the periph mode configured
127 * @mux_A_periph: mux as periph A
128 * @mux_B_periph: mux as periph B
129 * @mux_C_periph: mux as periph C
130 * @mux_D_periph: mux as periph D
131 * @get_deglitch: get deglitch status
132 * @set_deglitch: enable/disable deglitch
133 * @get_debounce: get debounce status
134 * @set_debounce: enable/disable debounce
135 * @get_pulldown: get pulldown status
136 * @set_pulldown: enable/disable pulldown
137 * @get_schmitt_trig: get schmitt trigger status
138 * @disable_schmitt_trig: disable schmitt trigger
139 * @irq_type: return irq type
140 */
141 struct at91_pinctrl_mux_ops {
142 enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
143 void (*mux_A_periph)(void __iomem *pio, unsigned mask);
144 void (*mux_B_periph)(void __iomem *pio, unsigned mask);
145 void (*mux_C_periph)(void __iomem *pio, unsigned mask);
146 void (*mux_D_periph)(void __iomem *pio, unsigned mask);
147 bool (*get_deglitch)(void __iomem *pio, unsigned pin);
148 void (*set_deglitch)(void __iomem *pio, unsigned mask, bool in_on);
149 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
150 void (*set_debounce)(void __iomem *pio, unsigned mask, bool in_on, u32 div);
151 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
152 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool in_on);
153 bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
154 void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
155 /* irq */
156 int (*irq_type)(struct irq_data *d, unsigned type);
157 };
158
159 static int gpio_irq_type(struct irq_data *d, unsigned type);
160 static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
161
162 struct at91_pinctrl {
163 struct device *dev;
164 struct pinctrl_dev *pctl;
165
166 int nbanks;
167
168 uint32_t *mux_mask;
169 int nmux;
170
171 struct at91_pmx_func *functions;
172 int nfunctions;
173
174 struct at91_pin_group *groups;
175 int ngroups;
176
177 struct at91_pinctrl_mux_ops *ops;
178 };
179
180 static const inline struct at91_pin_group *at91_pinctrl_find_group_by_name(
181 const struct at91_pinctrl *info,
182 const char *name)
183 {
184 const struct at91_pin_group *grp = NULL;
185 int i;
186
187 for (i = 0; i < info->ngroups; i++) {
188 if (strcmp(info->groups[i].name, name))
189 continue;
190
191 grp = &info->groups[i];
192 dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
193 break;
194 }
195
196 return grp;
197 }
198
199 static int at91_get_groups_count(struct pinctrl_dev *pctldev)
200 {
201 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
202
203 return info->ngroups;
204 }
205
206 static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
207 unsigned selector)
208 {
209 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
210
211 return info->groups[selector].name;
212 }
213
214 static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
215 const unsigned **pins,
216 unsigned *npins)
217 {
218 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
219
220 if (selector >= info->ngroups)
221 return -EINVAL;
222
223 *pins = info->groups[selector].pins;
224 *npins = info->groups[selector].npins;
225
226 return 0;
227 }
228
229 static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
230 unsigned offset)
231 {
232 seq_printf(s, "%s", dev_name(pctldev->dev));
233 }
234
235 static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
236 struct device_node *np,
237 struct pinctrl_map **map, unsigned *num_maps)
238 {
239 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
240 const struct at91_pin_group *grp;
241 struct pinctrl_map *new_map;
242 struct device_node *parent;
243 int map_num = 1;
244 int i;
245
246 /*
247 * first find the group of this node and check if we need create
248 * config maps for pins
249 */
250 grp = at91_pinctrl_find_group_by_name(info, np->name);
251 if (!grp) {
252 dev_err(info->dev, "unable to find group for node %s\n",
253 np->name);
254 return -EINVAL;
255 }
256
257 map_num += grp->npins;
258 new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, GFP_KERNEL);
259 if (!new_map)
260 return -ENOMEM;
261
262 *map = new_map;
263 *num_maps = map_num;
264
265 /* create mux map */
266 parent = of_get_parent(np);
267 if (!parent) {
268 devm_kfree(pctldev->dev, new_map);
269 return -EINVAL;
270 }
271 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
272 new_map[0].data.mux.function = parent->name;
273 new_map[0].data.mux.group = np->name;
274 of_node_put(parent);
275
276 /* create config map */
277 new_map++;
278 for (i = 0; i < grp->npins; i++) {
279 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
280 new_map[i].data.configs.group_or_pin =
281 pin_get_name(pctldev, grp->pins[i]);
282 new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
283 new_map[i].data.configs.num_configs = 1;
284 }
285
286 dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
287 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
288
289 return 0;
290 }
291
292 static void at91_dt_free_map(struct pinctrl_dev *pctldev,
293 struct pinctrl_map *map, unsigned num_maps)
294 {
295 }
296
297 static struct pinctrl_ops at91_pctrl_ops = {
298 .get_groups_count = at91_get_groups_count,
299 .get_group_name = at91_get_group_name,
300 .get_group_pins = at91_get_group_pins,
301 .pin_dbg_show = at91_pin_dbg_show,
302 .dt_node_to_map = at91_dt_node_to_map,
303 .dt_free_map = at91_dt_free_map,
304 };
305
306 static void __iomem * pin_to_controller(struct at91_pinctrl *info,
307 unsigned int bank)
308 {
309 return gpio_chips[bank]->regbase;
310 }
311
312 static inline int pin_to_bank(unsigned pin)
313 {
314 return pin /= MAX_NB_GPIO_PER_BANK;
315 }
316
317 static unsigned pin_to_mask(unsigned int pin)
318 {
319 return 1 << pin;
320 }
321
322 static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
323 {
324 writel_relaxed(mask, pio + PIO_IDR);
325 }
326
327 static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
328 {
329 return (readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1;
330 }
331
332 static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
333 {
334 writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
335 }
336
337 static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
338 {
339 return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
340 }
341
342 static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
343 {
344 writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
345 }
346
347 static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
348 {
349 writel_relaxed(mask, pio + PIO_ASR);
350 }
351
352 static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
353 {
354 writel_relaxed(mask, pio + PIO_BSR);
355 }
356
357 static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
358 {
359
360 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
361 pio + PIO_ABCDSR1);
362 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
363 pio + PIO_ABCDSR2);
364 }
365
366 static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
367 {
368 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
369 pio + PIO_ABCDSR1);
370 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
371 pio + PIO_ABCDSR2);
372 }
373
374 static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
375 {
376 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
377 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
378 }
379
380 static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
381 {
382 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
383 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
384 }
385
386 static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
387 {
388 unsigned select;
389
390 if (readl_relaxed(pio + PIO_PSR) & mask)
391 return AT91_MUX_GPIO;
392
393 select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
394 select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
395
396 return select + 1;
397 }
398
399 static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
400 {
401 unsigned select;
402
403 if (readl_relaxed(pio + PIO_PSR) & mask)
404 return AT91_MUX_GPIO;
405
406 select = readl_relaxed(pio + PIO_ABSR) & mask;
407
408 return select + 1;
409 }
410
411 static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
412 {
413 return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1;
414 }
415
416 static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
417 {
418 __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
419 }
420
421 static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
422 {
423 if (is_on)
424 __raw_writel(mask, pio + PIO_IFSCDR);
425 at91_mux_set_deglitch(pio, mask, is_on);
426 }
427
428 static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
429 {
430 *div = __raw_readl(pio + PIO_SCDR);
431
432 return (__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1;
433 }
434
435 static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
436 bool is_on, u32 div)
437 {
438 if (is_on) {
439 __raw_writel(mask, pio + PIO_IFSCER);
440 __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
441 __raw_writel(mask, pio + PIO_IFER);
442 } else {
443 __raw_writel(mask, pio + PIO_IFDR);
444 }
445 }
446
447 static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
448 {
449 return (__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1;
450 }
451
452 static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
453 {
454 __raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
455 }
456
457 static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
458 {
459 __raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
460 }
461
462 static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
463 {
464 return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1;
465 }
466
467 static struct at91_pinctrl_mux_ops at91rm9200_ops = {
468 .get_periph = at91_mux_get_periph,
469 .mux_A_periph = at91_mux_set_A_periph,
470 .mux_B_periph = at91_mux_set_B_periph,
471 .get_deglitch = at91_mux_get_deglitch,
472 .set_deglitch = at91_mux_set_deglitch,
473 .irq_type = gpio_irq_type,
474 };
475
476 static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
477 .get_periph = at91_mux_pio3_get_periph,
478 .mux_A_periph = at91_mux_pio3_set_A_periph,
479 .mux_B_periph = at91_mux_pio3_set_B_periph,
480 .mux_C_periph = at91_mux_pio3_set_C_periph,
481 .mux_D_periph = at91_mux_pio3_set_D_periph,
482 .get_deglitch = at91_mux_get_deglitch,
483 .set_deglitch = at91_mux_pio3_set_deglitch,
484 .get_debounce = at91_mux_pio3_get_debounce,
485 .set_debounce = at91_mux_pio3_set_debounce,
486 .get_pulldown = at91_mux_pio3_get_pulldown,
487 .set_pulldown = at91_mux_pio3_set_pulldown,
488 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
489 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
490 .irq_type = alt_gpio_irq_type,
491 };
492
493 static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
494 {
495 if (pin->mux) {
496 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lu\n",
497 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
498 } else {
499 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lu\n",
500 pin->bank + 'A', pin->pin, pin->conf);
501 }
502 }
503
504 static int pin_check_config(struct at91_pinctrl *info, const char* name,
505 int index, const struct at91_pmx_pin *pin)
506 {
507 int mux;
508
509 /* check if it's a valid config */
510 if (pin->bank >= info->nbanks) {
511 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
512 name, index, pin->bank, info->nbanks);
513 return -EINVAL;
514 }
515
516 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
517 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
518 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
519 return -EINVAL;
520 }
521
522 if (!pin->mux)
523 return 0;
524
525 mux = pin->mux - 1;
526
527 if (mux >= info->nmux) {
528 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
529 name, index, mux, info->nmux);
530 return -EINVAL;
531 }
532
533 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
534 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
535 name, index, mux, pin->bank + 'A', pin->pin);
536 return -EINVAL;
537 }
538
539 return 0;
540 }
541
542 static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
543 {
544 writel_relaxed(mask, pio + PIO_PDR);
545 }
546
547 static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
548 {
549 writel_relaxed(mask, pio + PIO_PER);
550 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
551 }
552
553 static int at91_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
554 unsigned group)
555 {
556 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
557 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
558 const struct at91_pmx_pin *pin;
559 uint32_t npins = info->groups[group].npins;
560 int i, ret;
561 unsigned mask;
562 void __iomem *pio;
563
564 dev_dbg(info->dev, "enable function %s group %s\n",
565 info->functions[selector].name, info->groups[group].name);
566
567 /* first check that all the pins of the group are valid with a valid
568 * paramter */
569 for (i = 0; i < npins; i++) {
570 pin = &pins_conf[i];
571 ret = pin_check_config(info, info->groups[group].name, i, pin);
572 if (ret)
573 return ret;
574 }
575
576 for (i = 0; i < npins; i++) {
577 pin = &pins_conf[i];
578 at91_pin_dbg(info->dev, pin);
579 pio = pin_to_controller(info, pin->bank);
580 mask = pin_to_mask(pin->pin);
581 at91_mux_disable_interrupt(pio, mask);
582 switch(pin->mux) {
583 case AT91_MUX_GPIO:
584 at91_mux_gpio_enable(pio, mask, 1);
585 break;
586 case AT91_MUX_PERIPH_A:
587 info->ops->mux_A_periph(pio, mask);
588 break;
589 case AT91_MUX_PERIPH_B:
590 info->ops->mux_B_periph(pio, mask);
591 break;
592 case AT91_MUX_PERIPH_C:
593 if (!info->ops->mux_C_periph)
594 return -EINVAL;
595 info->ops->mux_C_periph(pio, mask);
596 break;
597 case AT91_MUX_PERIPH_D:
598 if (!info->ops->mux_D_periph)
599 return -EINVAL;
600 info->ops->mux_D_periph(pio, mask);
601 break;
602 }
603 if (pin->mux)
604 at91_mux_gpio_disable(pio, mask);
605 }
606
607 return 0;
608 }
609
610 static void at91_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
611 unsigned group)
612 {
613 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
614 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
615 const struct at91_pmx_pin *pin;
616 uint32_t npins = info->groups[group].npins;
617 int i;
618 unsigned mask;
619 void __iomem *pio;
620
621 for (i = 0; i < npins; i++) {
622 pin = &pins_conf[i];
623 at91_pin_dbg(info->dev, pin);
624 pio = pin_to_controller(info, pin->bank);
625 mask = pin_to_mask(pin->pin);
626 at91_mux_gpio_enable(pio, mask, 1);
627 }
628 }
629
630 static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
631 {
632 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
633
634 return info->nfunctions;
635 }
636
637 static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
638 unsigned selector)
639 {
640 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
641
642 return info->functions[selector].name;
643 }
644
645 static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
646 const char * const **groups,
647 unsigned * const num_groups)
648 {
649 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
650
651 *groups = info->functions[selector].groups;
652 *num_groups = info->functions[selector].ngroups;
653
654 return 0;
655 }
656
657 static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
658 struct pinctrl_gpio_range *range,
659 unsigned offset)
660 {
661 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
662 struct at91_gpio_chip *at91_chip;
663 struct gpio_chip *chip;
664 unsigned mask;
665
666 if (!range) {
667 dev_err(npct->dev, "invalid range\n");
668 return -EINVAL;
669 }
670 if (!range->gc) {
671 dev_err(npct->dev, "missing GPIO chip in range\n");
672 return -EINVAL;
673 }
674 chip = range->gc;
675 at91_chip = container_of(chip, struct at91_gpio_chip, chip);
676
677 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
678
679 mask = 1 << (offset - chip->base);
680
681 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
682 offset, 'A' + range->id, offset - chip->base, mask);
683
684 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
685
686 return 0;
687 }
688
689 static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
690 struct pinctrl_gpio_range *range,
691 unsigned offset)
692 {
693 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
694
695 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
696 /* Set the pin to some default state, GPIO is usually default */
697 }
698
699 static struct pinmux_ops at91_pmx_ops = {
700 .get_functions_count = at91_pmx_get_funcs_count,
701 .get_function_name = at91_pmx_get_func_name,
702 .get_function_groups = at91_pmx_get_groups,
703 .enable = at91_pmx_enable,
704 .disable = at91_pmx_disable,
705 .gpio_request_enable = at91_gpio_request_enable,
706 .gpio_disable_free = at91_gpio_disable_free,
707 };
708
709 static int at91_pinconf_get(struct pinctrl_dev *pctldev,
710 unsigned pin_id, unsigned long *config)
711 {
712 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
713 void __iomem *pio;
714 unsigned pin;
715 int div;
716
717 dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, *config);
718 pio = pin_to_controller(info, pin_to_bank(pin_id));
719 pin = pin_id % MAX_NB_GPIO_PER_BANK;
720
721 if (at91_mux_get_multidrive(pio, pin))
722 *config |= MULTI_DRIVE;
723
724 if (at91_mux_get_pullup(pio, pin))
725 *config |= PULL_UP;
726
727 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
728 *config |= DEGLITCH;
729 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
730 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
731 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
732 *config |= PULL_DOWN;
733 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
734 *config |= DIS_SCHMIT;
735
736 return 0;
737 }
738
739 static int at91_pinconf_set(struct pinctrl_dev *pctldev,
740 unsigned pin_id, unsigned long config)
741 {
742 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
743 unsigned mask;
744 void __iomem *pio;
745
746 dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, config);
747 pio = pin_to_controller(info, pin_to_bank(pin_id));
748 mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK);
749
750 if (config & PULL_UP && config & PULL_DOWN)
751 return -EINVAL;
752
753 at91_mux_set_pullup(pio, mask, config & PULL_UP);
754 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
755 if (info->ops->set_deglitch)
756 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
757 if (info->ops->set_debounce)
758 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
759 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
760 if (info->ops->set_pulldown)
761 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
762 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
763 info->ops->disable_schmitt_trig(pio, mask);
764
765 return 0;
766 }
767
768 static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
769 struct seq_file *s, unsigned pin_id)
770 {
771
772 }
773
774 static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
775 struct seq_file *s, unsigned group)
776 {
777 }
778
779 static struct pinconf_ops at91_pinconf_ops = {
780 .pin_config_get = at91_pinconf_get,
781 .pin_config_set = at91_pinconf_set,
782 .pin_config_dbg_show = at91_pinconf_dbg_show,
783 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
784 };
785
786 static struct pinctrl_desc at91_pinctrl_desc = {
787 .pctlops = &at91_pctrl_ops,
788 .pmxops = &at91_pmx_ops,
789 .confops = &at91_pinconf_ops,
790 .owner = THIS_MODULE,
791 };
792
793 static const char *gpio_compat = "atmel,at91rm9200-gpio";
794
795 static void at91_pinctrl_child_count(struct at91_pinctrl *info,
796 struct device_node *np)
797 {
798 struct device_node *child;
799
800 for_each_child_of_node(np, child) {
801 if (of_device_is_compatible(child, gpio_compat)) {
802 info->nbanks++;
803 } else {
804 info->nfunctions++;
805 info->ngroups += of_get_child_count(child);
806 }
807 }
808 }
809
810 static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
811 struct device_node *np)
812 {
813 int ret = 0;
814 int size;
815 const const __be32 *list;
816
817 list = of_get_property(np, "atmel,mux-mask", &size);
818 if (!list) {
819 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
820 return -EINVAL;
821 }
822
823 size /= sizeof(*list);
824 if (!size || size % info->nbanks) {
825 dev_err(info->dev, "wrong mux mask array should be by %d\n", info->nbanks);
826 return -EINVAL;
827 }
828 info->nmux = size / info->nbanks;
829
830 info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL);
831 if (!info->mux_mask) {
832 dev_err(info->dev, "could not alloc mux_mask\n");
833 return -ENOMEM;
834 }
835
836 ret = of_property_read_u32_array(np, "atmel,mux-mask",
837 info->mux_mask, size);
838 if (ret)
839 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
840 return ret;
841 }
842
843 static int at91_pinctrl_parse_groups(struct device_node *np,
844 struct at91_pin_group *grp,
845 struct at91_pinctrl *info, u32 index)
846 {
847 struct at91_pmx_pin *pin;
848 int size;
849 const const __be32 *list;
850 int i, j;
851
852 dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
853
854 /* Initialise group */
855 grp->name = np->name;
856
857 /*
858 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
859 * do sanity check and calculate pins number
860 */
861 list = of_get_property(np, "atmel,pins", &size);
862 /* we do not check return since it's safe node passed down */
863 size /= sizeof(*list);
864 if (!size || size % 4) {
865 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
866 return -EINVAL;
867 }
868
869 grp->npins = size / 4;
870 pin = grp->pins_conf = devm_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin),
871 GFP_KERNEL);
872 grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
873 GFP_KERNEL);
874 if (!grp->pins_conf || !grp->pins)
875 return -ENOMEM;
876
877 for (i = 0, j = 0; i < size; i += 4, j++) {
878 pin->bank = be32_to_cpu(*list++);
879 pin->pin = be32_to_cpu(*list++);
880 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
881 pin->mux = be32_to_cpu(*list++);
882 pin->conf = be32_to_cpu(*list++);
883
884 at91_pin_dbg(info->dev, pin);
885 pin++;
886 }
887
888 return 0;
889 }
890
891 static int at91_pinctrl_parse_functions(struct device_node *np,
892 struct at91_pinctrl *info, u32 index)
893 {
894 struct device_node *child;
895 struct at91_pmx_func *func;
896 struct at91_pin_group *grp;
897 int ret;
898 static u32 grp_index;
899 u32 i = 0;
900
901 dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
902
903 func = &info->functions[index];
904
905 /* Initialise function */
906 func->name = np->name;
907 func->ngroups = of_get_child_count(np);
908 if (func->ngroups <= 0) {
909 dev_err(info->dev, "no groups defined\n");
910 return -EINVAL;
911 }
912 func->groups = devm_kzalloc(info->dev,
913 func->ngroups * sizeof(char *), GFP_KERNEL);
914 if (!func->groups)
915 return -ENOMEM;
916
917 for_each_child_of_node(np, child) {
918 func->groups[i] = child->name;
919 grp = &info->groups[grp_index++];
920 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
921 if (ret)
922 return ret;
923 }
924
925 return 0;
926 }
927
928 static struct of_device_id at91_pinctrl_of_match[] = {
929 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
930 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
931 { /* sentinel */ }
932 };
933
934 static int at91_pinctrl_probe_dt(struct platform_device *pdev,
935 struct at91_pinctrl *info)
936 {
937 int ret = 0;
938 int i, j;
939 uint32_t *tmp;
940 struct device_node *np = pdev->dev.of_node;
941 struct device_node *child;
942
943 if (!np)
944 return -ENODEV;
945
946 info->dev = &pdev->dev;
947 info->ops = (struct at91_pinctrl_mux_ops*)
948 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
949 at91_pinctrl_child_count(info, np);
950
951 if (info->nbanks < 1) {
952 dev_err(&pdev->dev, "you need to specify atleast one gpio-controller\n");
953 return -EINVAL;
954 }
955
956 ret = at91_pinctrl_mux_mask(info, np);
957 if (ret)
958 return ret;
959
960 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
961
962 dev_dbg(&pdev->dev, "mux-mask\n");
963 tmp = info->mux_mask;
964 for (i = 0; i < info->nbanks; i++) {
965 for (j = 0; j < info->nmux; j++, tmp++) {
966 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
967 }
968 }
969
970 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
971 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
972 info->functions = devm_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func),
973 GFP_KERNEL);
974 if (!info->functions)
975 return -ENOMEM;
976
977 info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct at91_pin_group),
978 GFP_KERNEL);
979 if (!info->groups)
980 return -ENOMEM;
981
982 dev_dbg(&pdev->dev, "nbanks = %d\n", info->nbanks);
983 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
984 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
985
986 i = 0;
987
988 for_each_child_of_node(np, child) {
989 if (of_device_is_compatible(child, gpio_compat))
990 continue;
991 ret = at91_pinctrl_parse_functions(child, info, i++);
992 if (ret) {
993 dev_err(&pdev->dev, "failed to parse function\n");
994 return ret;
995 }
996 }
997
998 return 0;
999 }
1000
1001 static int at91_pinctrl_probe(struct platform_device *pdev)
1002 {
1003 struct at91_pinctrl *info;
1004 struct pinctrl_pin_desc *pdesc;
1005 int ret, i, j ,k;
1006
1007 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1008 if (!info)
1009 return -ENOMEM;
1010
1011 ret = at91_pinctrl_probe_dt(pdev, info);
1012 if (ret)
1013 return ret;
1014
1015 /*
1016 * We need all the GPIO drivers to probe FIRST, or we will not be able
1017 * to obtain references to the struct gpio_chip * for them, and we
1018 * need this to proceed.
1019 */
1020 for (i = 0; i < info->nbanks; i++) {
1021 if (!gpio_chips[i]) {
1022 dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
1023 devm_kfree(&pdev->dev, info);
1024 return -EPROBE_DEFER;
1025 }
1026 }
1027
1028 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1029 at91_pinctrl_desc.npins = info->nbanks * MAX_NB_GPIO_PER_BANK;
1030 at91_pinctrl_desc.pins = pdesc =
1031 devm_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, GFP_KERNEL);
1032
1033 if (!at91_pinctrl_desc.pins)
1034 return -ENOMEM;
1035
1036 for (i = 0 , k = 0; i < info->nbanks; i++) {
1037 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1038 pdesc->number = k;
1039 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1040 pdesc++;
1041 }
1042 }
1043
1044 platform_set_drvdata(pdev, info);
1045 info->pctl = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, info);
1046
1047 if (!info->pctl) {
1048 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1049 ret = -EINVAL;
1050 goto err;
1051 }
1052
1053 /* We will handle a range of GPIO pins */
1054 for (i = 0; i < info->nbanks; i++)
1055 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1056
1057 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1058
1059 return 0;
1060
1061 err:
1062 return ret;
1063 }
1064
1065 static int at91_pinctrl_remove(struct platform_device *pdev)
1066 {
1067 struct at91_pinctrl *info = platform_get_drvdata(pdev);
1068
1069 pinctrl_unregister(info->pctl);
1070
1071 return 0;
1072 }
1073
1074 static int at91_gpio_request(struct gpio_chip *chip, unsigned offset)
1075 {
1076 /*
1077 * Map back to global GPIO space and request muxing, the direction
1078 * parameter does not matter for this controller.
1079 */
1080 int gpio = chip->base + offset;
1081 int bank = chip->base / chip->ngpio;
1082
1083 dev_dbg(chip->dev, "%s:%d pio%c%d(%d)\n", __func__, __LINE__,
1084 'A' + bank, offset, gpio);
1085
1086 return pinctrl_request_gpio(gpio);
1087 }
1088
1089 static void at91_gpio_free(struct gpio_chip *chip, unsigned offset)
1090 {
1091 int gpio = chip->base + offset;
1092
1093 pinctrl_free_gpio(gpio);
1094 }
1095
1096 static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1097 {
1098 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1099 void __iomem *pio = at91_gpio->regbase;
1100 unsigned mask = 1 << offset;
1101
1102 writel_relaxed(mask, pio + PIO_ODR);
1103 return 0;
1104 }
1105
1106 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1107 {
1108 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1109 void __iomem *pio = at91_gpio->regbase;
1110 unsigned mask = 1 << offset;
1111 u32 pdsr;
1112
1113 pdsr = readl_relaxed(pio + PIO_PDSR);
1114 return (pdsr & mask) != 0;
1115 }
1116
1117 static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1118 int val)
1119 {
1120 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1121 void __iomem *pio = at91_gpio->regbase;
1122 unsigned mask = 1 << offset;
1123
1124 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1125 }
1126
1127 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1128 int val)
1129 {
1130 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1131 void __iomem *pio = at91_gpio->regbase;
1132 unsigned mask = 1 << offset;
1133
1134 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1135 writel_relaxed(mask, pio + PIO_OER);
1136
1137 return 0;
1138 }
1139
1140 static int at91_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
1141 {
1142 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1143 int virq;
1144
1145 if (offset < chip->ngpio)
1146 virq = irq_create_mapping(at91_gpio->domain, offset);
1147 else
1148 virq = -ENXIO;
1149
1150 dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
1151 chip->label, offset + chip->base, virq);
1152 return virq;
1153 }
1154
1155 #ifdef CONFIG_DEBUG_FS
1156 static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1157 {
1158 enum at91_mux mode;
1159 int i;
1160 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1161 void __iomem *pio = at91_gpio->regbase;
1162
1163 for (i = 0; i < chip->ngpio; i++) {
1164 unsigned pin = chip->base + i;
1165 unsigned mask = pin_to_mask(pin);
1166 const char *gpio_label;
1167 u32 pdsr;
1168
1169 gpio_label = gpiochip_is_requested(chip, i);
1170 if (!gpio_label)
1171 continue;
1172 mode = at91_gpio->ops->get_periph(pio, mask);
1173 seq_printf(s, "[%s] GPIO%s%d: ",
1174 gpio_label, chip->label, i);
1175 if (mode == AT91_MUX_GPIO) {
1176 pdsr = readl_relaxed(pio + PIO_PDSR);
1177
1178 seq_printf(s, "[gpio] %s\n",
1179 pdsr & mask ?
1180 "set" : "clear");
1181 } else {
1182 seq_printf(s, "[periph %c]\n",
1183 mode + 'A' - 1);
1184 }
1185 }
1186 }
1187 #else
1188 #define at91_gpio_dbg_show NULL
1189 #endif
1190
1191 /* Several AIC controller irqs are dispatched through this GPIO handler.
1192 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1193 * at91_set_gpio_input() then maybe enable its glitch filter.
1194 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1195 * handler.
1196 * First implementation always triggers on rising and falling edges
1197 * whereas the newer PIO3 can be additionally configured to trigger on
1198 * level, edge with any polarity.
1199 *
1200 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1201 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1202 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1203 */
1204
1205 static void gpio_irq_mask(struct irq_data *d)
1206 {
1207 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1208 void __iomem *pio = at91_gpio->regbase;
1209 unsigned mask = 1 << d->hwirq;
1210
1211 if (pio)
1212 writel_relaxed(mask, pio + PIO_IDR);
1213 }
1214
1215 static void gpio_irq_unmask(struct irq_data *d)
1216 {
1217 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1218 void __iomem *pio = at91_gpio->regbase;
1219 unsigned mask = 1 << d->hwirq;
1220
1221 if (pio)
1222 writel_relaxed(mask, pio + PIO_IER);
1223 }
1224
1225 static int gpio_irq_type(struct irq_data *d, unsigned type)
1226 {
1227 switch (type) {
1228 case IRQ_TYPE_NONE:
1229 case IRQ_TYPE_EDGE_BOTH:
1230 return 0;
1231 default:
1232 return -EINVAL;
1233 }
1234 }
1235
1236 /* Alternate irq type for PIO3 support */
1237 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1238 {
1239 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1240 void __iomem *pio = at91_gpio->regbase;
1241 unsigned mask = 1 << d->hwirq;
1242
1243 switch (type) {
1244 case IRQ_TYPE_EDGE_RISING:
1245 writel_relaxed(mask, pio + PIO_ESR);
1246 writel_relaxed(mask, pio + PIO_REHLSR);
1247 break;
1248 case IRQ_TYPE_EDGE_FALLING:
1249 writel_relaxed(mask, pio + PIO_ESR);
1250 writel_relaxed(mask, pio + PIO_FELLSR);
1251 break;
1252 case IRQ_TYPE_LEVEL_LOW:
1253 writel_relaxed(mask, pio + PIO_LSR);
1254 writel_relaxed(mask, pio + PIO_FELLSR);
1255 break;
1256 case IRQ_TYPE_LEVEL_HIGH:
1257 writel_relaxed(mask, pio + PIO_LSR);
1258 writel_relaxed(mask, pio + PIO_REHLSR);
1259 break;
1260 case IRQ_TYPE_EDGE_BOTH:
1261 /*
1262 * disable additional interrupt modes:
1263 * fall back to default behavior
1264 */
1265 writel_relaxed(mask, pio + PIO_AIMDR);
1266 return 0;
1267 case IRQ_TYPE_NONE:
1268 default:
1269 pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq));
1270 return -EINVAL;
1271 }
1272
1273 /* enable additional interrupt modes */
1274 writel_relaxed(mask, pio + PIO_AIMER);
1275
1276 return 0;
1277 }
1278
1279 #ifdef CONFIG_PM
1280 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1281 {
1282 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1283 unsigned bank = at91_gpio->pioc_idx;
1284
1285 if (unlikely(bank >= MAX_GPIO_BANKS))
1286 return -EINVAL;
1287
1288 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1289
1290 return 0;
1291 }
1292 #else
1293 #define gpio_irq_set_wake NULL
1294 #endif
1295
1296 static struct irq_chip gpio_irqchip = {
1297 .name = "GPIO",
1298 .irq_disable = gpio_irq_mask,
1299 .irq_mask = gpio_irq_mask,
1300 .irq_unmask = gpio_irq_unmask,
1301 /* .irq_set_type is set dynamically */
1302 .irq_set_wake = gpio_irq_set_wake,
1303 };
1304
1305 static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
1306 {
1307 struct irq_chip *chip = irq_desc_get_chip(desc);
1308 struct irq_data *idata = irq_desc_get_irq_data(desc);
1309 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata);
1310 void __iomem *pio = at91_gpio->regbase;
1311 unsigned long isr;
1312 int n;
1313
1314 chained_irq_enter(chip, desc);
1315 for (;;) {
1316 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
1317 * When there none are pending, we're finished unless we need
1318 * to process multiple banks (like ID_PIOCDE on sam9263).
1319 */
1320 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1321 if (!isr) {
1322 if (!at91_gpio->next)
1323 break;
1324 at91_gpio = at91_gpio->next;
1325 pio = at91_gpio->regbase;
1326 continue;
1327 }
1328
1329 for_each_set_bit(n, &isr, BITS_PER_LONG) {
1330 generic_handle_irq(irq_find_mapping(at91_gpio->domain, n));
1331 }
1332 }
1333 chained_irq_exit(chip, desc);
1334 /* now it may re-trigger */
1335 }
1336
1337 /*
1338 * This lock class tells lockdep that GPIO irqs are in a different
1339 * category than their parents, so it won't report false recursion.
1340 */
1341 static struct lock_class_key gpio_lock_class;
1342
1343 static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
1344 irq_hw_number_t hw)
1345 {
1346 struct at91_gpio_chip *at91_gpio = h->host_data;
1347
1348 irq_set_lockdep_class(virq, &gpio_lock_class);
1349
1350 /*
1351 * Can use the "simple" and not "edge" handler since it's
1352 * shorter, and the AIC handles interrupts sanely.
1353 */
1354 irq_set_chip_and_handler(virq, &gpio_irqchip,
1355 handle_simple_irq);
1356 set_irq_flags(virq, IRQF_VALID);
1357 irq_set_chip_data(virq, at91_gpio);
1358
1359 return 0;
1360 }
1361
1362 static int at91_gpio_irq_domain_xlate(struct irq_domain *d,
1363 struct device_node *ctrlr,
1364 const u32 *intspec, unsigned int intsize,
1365 irq_hw_number_t *out_hwirq,
1366 unsigned int *out_type)
1367 {
1368 struct at91_gpio_chip *at91_gpio = d->host_data;
1369 int ret;
1370 int pin = at91_gpio->chip.base + intspec[0];
1371
1372 if (WARN_ON(intsize < 2))
1373 return -EINVAL;
1374 *out_hwirq = intspec[0];
1375 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1376
1377 ret = gpio_request(pin, ctrlr->full_name);
1378 if (ret)
1379 return ret;
1380
1381 ret = gpio_direction_input(pin);
1382 if (ret)
1383 return ret;
1384
1385 return 0;
1386 }
1387
1388 static struct irq_domain_ops at91_gpio_ops = {
1389 .map = at91_gpio_irq_map,
1390 .xlate = at91_gpio_irq_domain_xlate,
1391 };
1392
1393 static int at91_gpio_of_irq_setup(struct device_node *node,
1394 struct at91_gpio_chip *at91_gpio)
1395 {
1396 struct at91_gpio_chip *prev = NULL;
1397 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
1398
1399 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1400
1401 /* Setup proper .irq_set_type function */
1402 gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type;
1403
1404 /* Disable irqs of this PIO controller */
1405 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1406
1407 /* Setup irq domain */
1408 at91_gpio->domain = irq_domain_add_linear(node, at91_gpio->chip.ngpio,
1409 &at91_gpio_ops, at91_gpio);
1410 if (!at91_gpio->domain)
1411 panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n",
1412 at91_gpio->pioc_idx);
1413
1414 /* Setup chained handler */
1415 if (at91_gpio->pioc_idx)
1416 prev = gpio_chips[at91_gpio->pioc_idx - 1];
1417
1418 /* The toplevel handler handles one bank of GPIOs, except
1419 * on some SoC it can handles up to three...
1420 * We only set up the handler for the first of the list.
1421 */
1422 if (prev && prev->next == at91_gpio)
1423 return 0;
1424
1425 irq_set_chip_data(at91_gpio->pioc_virq, at91_gpio);
1426 irq_set_chained_handler(at91_gpio->pioc_virq, gpio_irq_handler);
1427
1428 return 0;
1429 }
1430
1431 /* This structure is replicated for each GPIO block allocated at probe time */
1432 static struct gpio_chip at91_gpio_template = {
1433 .request = at91_gpio_request,
1434 .free = at91_gpio_free,
1435 .direction_input = at91_gpio_direction_input,
1436 .get = at91_gpio_get,
1437 .direction_output = at91_gpio_direction_output,
1438 .set = at91_gpio_set,
1439 .to_irq = at91_gpio_to_irq,
1440 .dbg_show = at91_gpio_dbg_show,
1441 .can_sleep = 0,
1442 .ngpio = MAX_NB_GPIO_PER_BANK,
1443 };
1444
1445 static void at91_gpio_probe_fixup(void)
1446 {
1447 unsigned i;
1448 struct at91_gpio_chip *at91_gpio, *last = NULL;
1449
1450 for (i = 0; i < gpio_banks; i++) {
1451 at91_gpio = gpio_chips[i];
1452
1453 /*
1454 * GPIO controller are grouped on some SoC:
1455 * PIOC, PIOD and PIOE can share the same IRQ line
1456 */
1457 if (last && last->pioc_virq == at91_gpio->pioc_virq)
1458 last->next = at91_gpio;
1459 last = at91_gpio;
1460 }
1461 }
1462
1463 static struct of_device_id at91_gpio_of_match[] = {
1464 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1465 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1466 { /* sentinel */ }
1467 };
1468
1469 static int at91_gpio_probe(struct platform_device *pdev)
1470 {
1471 struct device_node *np = pdev->dev.of_node;
1472 struct resource *res;
1473 struct at91_gpio_chip *at91_chip = NULL;
1474 struct gpio_chip *chip;
1475 struct pinctrl_gpio_range *range;
1476 int ret = 0;
1477 int irq, i;
1478 int alias_idx = of_alias_get_id(np, "gpio");
1479 uint32_t ngpio;
1480 char **names;
1481
1482 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1483 if (gpio_chips[alias_idx]) {
1484 ret = -EBUSY;
1485 goto err;
1486 }
1487
1488 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1489 if (!res) {
1490 ret = -ENOENT;
1491 goto err;
1492 }
1493
1494 irq = platform_get_irq(pdev, 0);
1495 if (irq < 0) {
1496 ret = irq;
1497 goto err;
1498 }
1499
1500 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1501 if (!at91_chip) {
1502 ret = -ENOMEM;
1503 goto err;
1504 }
1505
1506 at91_chip->regbase = devm_request_and_ioremap(&pdev->dev, res);
1507 if (!at91_chip->regbase) {
1508 dev_err(&pdev->dev, "failed to map registers, ignoring.\n");
1509 ret = -EBUSY;
1510 goto err;
1511 }
1512
1513 at91_chip->ops = (struct at91_pinctrl_mux_ops*)
1514 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1515 at91_chip->pioc_virq = irq;
1516 at91_chip->pioc_idx = alias_idx;
1517
1518 at91_chip->clock = clk_get(&pdev->dev, NULL);
1519 if (IS_ERR(at91_chip->clock)) {
1520 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1521 goto err;
1522 }
1523
1524 if (clk_prepare(at91_chip->clock))
1525 goto clk_prep_err;
1526
1527 /* enable PIO controller's clock */
1528 if (clk_enable(at91_chip->clock)) {
1529 dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
1530 goto clk_err;
1531 }
1532
1533 at91_chip->chip = at91_gpio_template;
1534
1535 chip = &at91_chip->chip;
1536 chip->of_node = np;
1537 chip->label = dev_name(&pdev->dev);
1538 chip->dev = &pdev->dev;
1539 chip->owner = THIS_MODULE;
1540 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1541
1542 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1543 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1544 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1545 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1546 else
1547 chip->ngpio = ngpio;
1548 }
1549
1550 names = devm_kzalloc(&pdev->dev, sizeof(char*) * chip->ngpio, GFP_KERNEL);
1551
1552 if (!names) {
1553 ret = -ENOMEM;
1554 goto clk_err;
1555 }
1556
1557 for (i = 0; i < chip->ngpio; i++)
1558 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1559
1560 chip->names = (const char*const*)names;
1561
1562 range = &at91_chip->range;
1563 range->name = chip->label;
1564 range->id = alias_idx;
1565 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1566
1567 range->npins = chip->ngpio;
1568 range->gc = chip;
1569
1570 ret = gpiochip_add(chip);
1571 if (ret)
1572 goto clk_err;
1573
1574 gpio_chips[alias_idx] = at91_chip;
1575 gpio_banks = max(gpio_banks, alias_idx + 1);
1576
1577 at91_gpio_probe_fixup();
1578
1579 at91_gpio_of_irq_setup(np, at91_chip);
1580
1581 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1582
1583 return 0;
1584
1585 clk_err:
1586 clk_unprepare(at91_chip->clock);
1587 clk_prep_err:
1588 clk_put(at91_chip->clock);
1589 err:
1590 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1591
1592 return ret;
1593 }
1594
1595 static struct platform_driver at91_gpio_driver = {
1596 .driver = {
1597 .name = "gpio-at91",
1598 .owner = THIS_MODULE,
1599 .of_match_table = of_match_ptr(at91_gpio_of_match),
1600 },
1601 .probe = at91_gpio_probe,
1602 };
1603
1604 static struct platform_driver at91_pinctrl_driver = {
1605 .driver = {
1606 .name = "pinctrl-at91",
1607 .owner = THIS_MODULE,
1608 .of_match_table = of_match_ptr(at91_pinctrl_of_match),
1609 },
1610 .probe = at91_pinctrl_probe,
1611 .remove = at91_pinctrl_remove,
1612 };
1613
1614 static int __init at91_pinctrl_init(void)
1615 {
1616 int ret;
1617
1618 ret = platform_driver_register(&at91_gpio_driver);
1619 if (ret)
1620 return ret;
1621 return platform_driver_register(&at91_pinctrl_driver);
1622 }
1623 arch_initcall(at91_pinctrl_init);
1624
1625 static void __exit at91_pinctrl_exit(void)
1626 {
1627 platform_driver_unregister(&at91_pinctrl_driver);
1628 }
1629
1630 module_exit(at91_pinctrl_exit);
1631 MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>");
1632 MODULE_DESCRIPTION("Atmel AT91 pinctrl driver");
1633 MODULE_LICENSE("GPL v2");
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