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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pinctrl / pinctrl-at91.c
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/irqchip/chained_irq.h>
22 #include <linux/io.h>
23 #include <linux/gpio.h>
24 #include <linux/pinctrl/machine.h>
25 #include <linux/pinctrl/pinconf.h>
26 #include <linux/pinctrl/pinctrl.h>
27 #include <linux/pinctrl/pinmux.h>
28 /* Since we request GPIOs from ourself */
29 #include <linux/pinctrl/consumer.h>
30
31 #include <mach/hardware.h>
32 #include <mach/at91_pio.h>
33
34 #include "core.h"
35
36 #define MAX_NB_GPIO_PER_BANK 32
37
38 struct at91_pinctrl_mux_ops;
39
40 struct at91_gpio_chip {
41 struct gpio_chip chip;
42 struct pinctrl_gpio_range range;
43 struct at91_gpio_chip *next; /* Bank sharing same clock */
44 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
45 int pioc_virq; /* PIO bank Linux virtual interrupt */
46 int pioc_idx; /* PIO bank index */
47 void __iomem *regbase; /* PIO bank virtual address */
48 struct clk *clock; /* associated clock */
49 struct irq_domain *domain; /* associated irq domain */
50 struct at91_pinctrl_mux_ops *ops; /* ops */
51 };
52
53 #define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip)
54
55 static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
56
57 static int gpio_banks;
58
59 #define PULL_UP (1 << 0)
60 #define MULTI_DRIVE (1 << 1)
61 #define DEGLITCH (1 << 2)
62 #define PULL_DOWN (1 << 3)
63 #define DIS_SCHMIT (1 << 4)
64 #define DEBOUNCE (1 << 16)
65 #define DEBOUNCE_VAL_SHIFT 17
66 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
67
68 /**
69 * struct at91_pmx_func - describes AT91 pinmux functions
70 * @name: the name of this specific function
71 * @groups: corresponding pin groups
72 * @ngroups: the number of groups
73 */
74 struct at91_pmx_func {
75 const char *name;
76 const char **groups;
77 unsigned ngroups;
78 };
79
80 enum at91_mux {
81 AT91_MUX_GPIO = 0,
82 AT91_MUX_PERIPH_A = 1,
83 AT91_MUX_PERIPH_B = 2,
84 AT91_MUX_PERIPH_C = 3,
85 AT91_MUX_PERIPH_D = 4,
86 };
87
88 /**
89 * struct at91_pmx_pin - describes an At91 pin mux
90 * @bank: the bank of the pin
91 * @pin: the pin number in the @bank
92 * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
93 * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
94 */
95 struct at91_pmx_pin {
96 uint32_t bank;
97 uint32_t pin;
98 enum at91_mux mux;
99 unsigned long conf;
100 };
101
102 /**
103 * struct at91_pin_group - describes an At91 pin group
104 * @name: the name of this specific pin group
105 * @pins_conf: the mux mode for each pin in this group. The size of this
106 * array is the same as pins.
107 * @pins: an array of discrete physical pins used in this group, taken
108 * from the driver-local pin enumeration space
109 * @npins: the number of pins in this group array, i.e. the number of
110 * elements in .pins so we can iterate over that array
111 */
112 struct at91_pin_group {
113 const char *name;
114 struct at91_pmx_pin *pins_conf;
115 unsigned int *pins;
116 unsigned npins;
117 };
118
119 /**
120 * struct at91_pinctrl_mux_ops - describes an At91 mux ops group
121 * on new IP with support for periph C and D the way to mux in
122 * periph A and B has changed
123 * So provide the right call back
124 * if not present means the IP does not support it
125 * @get_periph: return the periph mode configured
126 * @mux_A_periph: mux as periph A
127 * @mux_B_periph: mux as periph B
128 * @mux_C_periph: mux as periph C
129 * @mux_D_periph: mux as periph D
130 * @get_deglitch: get deglitch status
131 * @set_deglitch: enable/disable deglitch
132 * @get_debounce: get debounce status
133 * @set_debounce: enable/disable debounce
134 * @get_pulldown: get pulldown status
135 * @set_pulldown: enable/disable pulldown
136 * @get_schmitt_trig: get schmitt trigger status
137 * @disable_schmitt_trig: disable schmitt trigger
138 * @irq_type: return irq type
139 */
140 struct at91_pinctrl_mux_ops {
141 enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
142 void (*mux_A_periph)(void __iomem *pio, unsigned mask);
143 void (*mux_B_periph)(void __iomem *pio, unsigned mask);
144 void (*mux_C_periph)(void __iomem *pio, unsigned mask);
145 void (*mux_D_periph)(void __iomem *pio, unsigned mask);
146 bool (*get_deglitch)(void __iomem *pio, unsigned pin);
147 void (*set_deglitch)(void __iomem *pio, unsigned mask, bool in_on);
148 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
149 void (*set_debounce)(void __iomem *pio, unsigned mask, bool in_on, u32 div);
150 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
151 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool in_on);
152 bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
153 void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
154 /* irq */
155 int (*irq_type)(struct irq_data *d, unsigned type);
156 };
157
158 static int gpio_irq_type(struct irq_data *d, unsigned type);
159 static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
160
161 struct at91_pinctrl {
162 struct device *dev;
163 struct pinctrl_dev *pctl;
164
165 int nbanks;
166
167 uint32_t *mux_mask;
168 int nmux;
169
170 struct at91_pmx_func *functions;
171 int nfunctions;
172
173 struct at91_pin_group *groups;
174 int ngroups;
175
176 struct at91_pinctrl_mux_ops *ops;
177 };
178
179 static const inline struct at91_pin_group *at91_pinctrl_find_group_by_name(
180 const struct at91_pinctrl *info,
181 const char *name)
182 {
183 const struct at91_pin_group *grp = NULL;
184 int i;
185
186 for (i = 0; i < info->ngroups; i++) {
187 if (strcmp(info->groups[i].name, name))
188 continue;
189
190 grp = &info->groups[i];
191 dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
192 break;
193 }
194
195 return grp;
196 }
197
198 static int at91_get_groups_count(struct pinctrl_dev *pctldev)
199 {
200 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
201
202 return info->ngroups;
203 }
204
205 static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
206 unsigned selector)
207 {
208 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
209
210 return info->groups[selector].name;
211 }
212
213 static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
214 const unsigned **pins,
215 unsigned *npins)
216 {
217 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
218
219 if (selector >= info->ngroups)
220 return -EINVAL;
221
222 *pins = info->groups[selector].pins;
223 *npins = info->groups[selector].npins;
224
225 return 0;
226 }
227
228 static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
229 unsigned offset)
230 {
231 seq_printf(s, "%s", dev_name(pctldev->dev));
232 }
233
234 static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
235 struct device_node *np,
236 struct pinctrl_map **map, unsigned *num_maps)
237 {
238 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
239 const struct at91_pin_group *grp;
240 struct pinctrl_map *new_map;
241 struct device_node *parent;
242 int map_num = 1;
243 int i;
244
245 /*
246 * first find the group of this node and check if we need create
247 * config maps for pins
248 */
249 grp = at91_pinctrl_find_group_by_name(info, np->name);
250 if (!grp) {
251 dev_err(info->dev, "unable to find group for node %s\n",
252 np->name);
253 return -EINVAL;
254 }
255
256 map_num += grp->npins;
257 new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, GFP_KERNEL);
258 if (!new_map)
259 return -ENOMEM;
260
261 *map = new_map;
262 *num_maps = map_num;
263
264 /* create mux map */
265 parent = of_get_parent(np);
266 if (!parent) {
267 devm_kfree(pctldev->dev, new_map);
268 return -EINVAL;
269 }
270 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
271 new_map[0].data.mux.function = parent->name;
272 new_map[0].data.mux.group = np->name;
273 of_node_put(parent);
274
275 /* create config map */
276 new_map++;
277 for (i = 0; i < grp->npins; i++) {
278 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
279 new_map[i].data.configs.group_or_pin =
280 pin_get_name(pctldev, grp->pins[i]);
281 new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
282 new_map[i].data.configs.num_configs = 1;
283 }
284
285 dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
286 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
287
288 return 0;
289 }
290
291 static void at91_dt_free_map(struct pinctrl_dev *pctldev,
292 struct pinctrl_map *map, unsigned num_maps)
293 {
294 }
295
296 static const struct pinctrl_ops at91_pctrl_ops = {
297 .get_groups_count = at91_get_groups_count,
298 .get_group_name = at91_get_group_name,
299 .get_group_pins = at91_get_group_pins,
300 .pin_dbg_show = at91_pin_dbg_show,
301 .dt_node_to_map = at91_dt_node_to_map,
302 .dt_free_map = at91_dt_free_map,
303 };
304
305 static void __iomem *pin_to_controller(struct at91_pinctrl *info,
306 unsigned int bank)
307 {
308 return gpio_chips[bank]->regbase;
309 }
310
311 static inline int pin_to_bank(unsigned pin)
312 {
313 return pin /= MAX_NB_GPIO_PER_BANK;
314 }
315
316 static unsigned pin_to_mask(unsigned int pin)
317 {
318 return 1 << pin;
319 }
320
321 static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
322 {
323 writel_relaxed(mask, pio + PIO_IDR);
324 }
325
326 static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
327 {
328 return (readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1;
329 }
330
331 static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
332 {
333 writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
334 }
335
336 static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
337 {
338 return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
339 }
340
341 static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
342 {
343 writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
344 }
345
346 static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
347 {
348 writel_relaxed(mask, pio + PIO_ASR);
349 }
350
351 static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
352 {
353 writel_relaxed(mask, pio + PIO_BSR);
354 }
355
356 static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
357 {
358
359 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
360 pio + PIO_ABCDSR1);
361 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
362 pio + PIO_ABCDSR2);
363 }
364
365 static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
366 {
367 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
368 pio + PIO_ABCDSR1);
369 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
370 pio + PIO_ABCDSR2);
371 }
372
373 static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
374 {
375 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
376 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
377 }
378
379 static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
380 {
381 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
382 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
383 }
384
385 static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
386 {
387 unsigned select;
388
389 if (readl_relaxed(pio + PIO_PSR) & mask)
390 return AT91_MUX_GPIO;
391
392 select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
393 select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
394
395 return select + 1;
396 }
397
398 static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
399 {
400 unsigned select;
401
402 if (readl_relaxed(pio + PIO_PSR) & mask)
403 return AT91_MUX_GPIO;
404
405 select = readl_relaxed(pio + PIO_ABSR) & mask;
406
407 return select + 1;
408 }
409
410 static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
411 {
412 return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1;
413 }
414
415 static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
416 {
417 __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
418 }
419
420 static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
421 {
422 if (is_on)
423 __raw_writel(mask, pio + PIO_IFSCDR);
424 at91_mux_set_deglitch(pio, mask, is_on);
425 }
426
427 static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
428 {
429 *div = __raw_readl(pio + PIO_SCDR);
430
431 return (__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1;
432 }
433
434 static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
435 bool is_on, u32 div)
436 {
437 if (is_on) {
438 __raw_writel(mask, pio + PIO_IFSCER);
439 __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
440 __raw_writel(mask, pio + PIO_IFER);
441 } else {
442 __raw_writel(mask, pio + PIO_IFDR);
443 }
444 }
445
446 static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
447 {
448 return (__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1;
449 }
450
451 static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
452 {
453 __raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
454 }
455
456 static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
457 {
458 __raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
459 }
460
461 static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
462 {
463 return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1;
464 }
465
466 static struct at91_pinctrl_mux_ops at91rm9200_ops = {
467 .get_periph = at91_mux_get_periph,
468 .mux_A_periph = at91_mux_set_A_periph,
469 .mux_B_periph = at91_mux_set_B_periph,
470 .get_deglitch = at91_mux_get_deglitch,
471 .set_deglitch = at91_mux_set_deglitch,
472 .irq_type = gpio_irq_type,
473 };
474
475 static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
476 .get_periph = at91_mux_pio3_get_periph,
477 .mux_A_periph = at91_mux_pio3_set_A_periph,
478 .mux_B_periph = at91_mux_pio3_set_B_periph,
479 .mux_C_periph = at91_mux_pio3_set_C_periph,
480 .mux_D_periph = at91_mux_pio3_set_D_periph,
481 .get_deglitch = at91_mux_get_deglitch,
482 .set_deglitch = at91_mux_pio3_set_deglitch,
483 .get_debounce = at91_mux_pio3_get_debounce,
484 .set_debounce = at91_mux_pio3_set_debounce,
485 .get_pulldown = at91_mux_pio3_get_pulldown,
486 .set_pulldown = at91_mux_pio3_set_pulldown,
487 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
488 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
489 .irq_type = alt_gpio_irq_type,
490 };
491
492 static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
493 {
494 if (pin->mux) {
495 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lu\n",
496 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
497 } else {
498 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lu\n",
499 pin->bank + 'A', pin->pin, pin->conf);
500 }
501 }
502
503 static int pin_check_config(struct at91_pinctrl *info, const char *name,
504 int index, const struct at91_pmx_pin *pin)
505 {
506 int mux;
507
508 /* check if it's a valid config */
509 if (pin->bank >= info->nbanks) {
510 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
511 name, index, pin->bank, info->nbanks);
512 return -EINVAL;
513 }
514
515 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
516 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
517 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
518 return -EINVAL;
519 }
520
521 if (!pin->mux)
522 return 0;
523
524 mux = pin->mux - 1;
525
526 if (mux >= info->nmux) {
527 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
528 name, index, mux, info->nmux);
529 return -EINVAL;
530 }
531
532 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
533 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
534 name, index, mux, pin->bank + 'A', pin->pin);
535 return -EINVAL;
536 }
537
538 return 0;
539 }
540
541 static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
542 {
543 writel_relaxed(mask, pio + PIO_PDR);
544 }
545
546 static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
547 {
548 writel_relaxed(mask, pio + PIO_PER);
549 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
550 }
551
552 static int at91_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
553 unsigned group)
554 {
555 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
556 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
557 const struct at91_pmx_pin *pin;
558 uint32_t npins = info->groups[group].npins;
559 int i, ret;
560 unsigned mask;
561 void __iomem *pio;
562
563 dev_dbg(info->dev, "enable function %s group %s\n",
564 info->functions[selector].name, info->groups[group].name);
565
566 /* first check that all the pins of the group are valid with a valid
567 * paramter */
568 for (i = 0; i < npins; i++) {
569 pin = &pins_conf[i];
570 ret = pin_check_config(info, info->groups[group].name, i, pin);
571 if (ret)
572 return ret;
573 }
574
575 for (i = 0; i < npins; i++) {
576 pin = &pins_conf[i];
577 at91_pin_dbg(info->dev, pin);
578 pio = pin_to_controller(info, pin->bank);
579 mask = pin_to_mask(pin->pin);
580 at91_mux_disable_interrupt(pio, mask);
581 switch (pin->mux) {
582 case AT91_MUX_GPIO:
583 at91_mux_gpio_enable(pio, mask, 1);
584 break;
585 case AT91_MUX_PERIPH_A:
586 info->ops->mux_A_periph(pio, mask);
587 break;
588 case AT91_MUX_PERIPH_B:
589 info->ops->mux_B_periph(pio, mask);
590 break;
591 case AT91_MUX_PERIPH_C:
592 if (!info->ops->mux_C_periph)
593 return -EINVAL;
594 info->ops->mux_C_periph(pio, mask);
595 break;
596 case AT91_MUX_PERIPH_D:
597 if (!info->ops->mux_D_periph)
598 return -EINVAL;
599 info->ops->mux_D_periph(pio, mask);
600 break;
601 }
602 if (pin->mux)
603 at91_mux_gpio_disable(pio, mask);
604 }
605
606 return 0;
607 }
608
609 static void at91_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
610 unsigned group)
611 {
612 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
613 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
614 const struct at91_pmx_pin *pin;
615 uint32_t npins = info->groups[group].npins;
616 int i;
617 unsigned mask;
618 void __iomem *pio;
619
620 for (i = 0; i < npins; i++) {
621 pin = &pins_conf[i];
622 at91_pin_dbg(info->dev, pin);
623 pio = pin_to_controller(info, pin->bank);
624 mask = pin_to_mask(pin->pin);
625 at91_mux_gpio_enable(pio, mask, 1);
626 }
627 }
628
629 static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
630 {
631 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
632
633 return info->nfunctions;
634 }
635
636 static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
637 unsigned selector)
638 {
639 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
640
641 return info->functions[selector].name;
642 }
643
644 static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
645 const char * const **groups,
646 unsigned * const num_groups)
647 {
648 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
649
650 *groups = info->functions[selector].groups;
651 *num_groups = info->functions[selector].ngroups;
652
653 return 0;
654 }
655
656 static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
657 struct pinctrl_gpio_range *range,
658 unsigned offset)
659 {
660 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
661 struct at91_gpio_chip *at91_chip;
662 struct gpio_chip *chip;
663 unsigned mask;
664
665 if (!range) {
666 dev_err(npct->dev, "invalid range\n");
667 return -EINVAL;
668 }
669 if (!range->gc) {
670 dev_err(npct->dev, "missing GPIO chip in range\n");
671 return -EINVAL;
672 }
673 chip = range->gc;
674 at91_chip = container_of(chip, struct at91_gpio_chip, chip);
675
676 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
677
678 mask = 1 << (offset - chip->base);
679
680 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
681 offset, 'A' + range->id, offset - chip->base, mask);
682
683 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
684
685 return 0;
686 }
687
688 static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
689 struct pinctrl_gpio_range *range,
690 unsigned offset)
691 {
692 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
693
694 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
695 /* Set the pin to some default state, GPIO is usually default */
696 }
697
698 static const struct pinmux_ops at91_pmx_ops = {
699 .get_functions_count = at91_pmx_get_funcs_count,
700 .get_function_name = at91_pmx_get_func_name,
701 .get_function_groups = at91_pmx_get_groups,
702 .enable = at91_pmx_enable,
703 .disable = at91_pmx_disable,
704 .gpio_request_enable = at91_gpio_request_enable,
705 .gpio_disable_free = at91_gpio_disable_free,
706 };
707
708 static int at91_pinconf_get(struct pinctrl_dev *pctldev,
709 unsigned pin_id, unsigned long *config)
710 {
711 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
712 void __iomem *pio;
713 unsigned pin;
714 int div;
715
716 dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, *config);
717 pio = pin_to_controller(info, pin_to_bank(pin_id));
718 pin = pin_id % MAX_NB_GPIO_PER_BANK;
719
720 if (at91_mux_get_multidrive(pio, pin))
721 *config |= MULTI_DRIVE;
722
723 if (at91_mux_get_pullup(pio, pin))
724 *config |= PULL_UP;
725
726 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
727 *config |= DEGLITCH;
728 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
729 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
730 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
731 *config |= PULL_DOWN;
732 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
733 *config |= DIS_SCHMIT;
734
735 return 0;
736 }
737
738 static int at91_pinconf_set(struct pinctrl_dev *pctldev,
739 unsigned pin_id, unsigned long config)
740 {
741 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
742 unsigned mask;
743 void __iomem *pio;
744
745 dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, config);
746 pio = pin_to_controller(info, pin_to_bank(pin_id));
747 mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK);
748
749 if (config & PULL_UP && config & PULL_DOWN)
750 return -EINVAL;
751
752 at91_mux_set_pullup(pio, mask, config & PULL_UP);
753 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
754 if (info->ops->set_deglitch)
755 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
756 if (info->ops->set_debounce)
757 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
758 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
759 if (info->ops->set_pulldown)
760 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
761 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
762 info->ops->disable_schmitt_trig(pio, mask);
763
764 return 0;
765 }
766
767 static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
768 struct seq_file *s, unsigned pin_id)
769 {
770
771 }
772
773 static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
774 struct seq_file *s, unsigned group)
775 {
776 }
777
778 static const struct pinconf_ops at91_pinconf_ops = {
779 .pin_config_get = at91_pinconf_get,
780 .pin_config_set = at91_pinconf_set,
781 .pin_config_dbg_show = at91_pinconf_dbg_show,
782 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
783 };
784
785 static struct pinctrl_desc at91_pinctrl_desc = {
786 .pctlops = &at91_pctrl_ops,
787 .pmxops = &at91_pmx_ops,
788 .confops = &at91_pinconf_ops,
789 .owner = THIS_MODULE,
790 };
791
792 static const char *gpio_compat = "atmel,at91rm9200-gpio";
793
794 static void at91_pinctrl_child_count(struct at91_pinctrl *info,
795 struct device_node *np)
796 {
797 struct device_node *child;
798
799 for_each_child_of_node(np, child) {
800 if (of_device_is_compatible(child, gpio_compat)) {
801 info->nbanks++;
802 } else {
803 info->nfunctions++;
804 info->ngroups += of_get_child_count(child);
805 }
806 }
807 }
808
809 static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
810 struct device_node *np)
811 {
812 int ret = 0;
813 int size;
814 const __be32 *list;
815
816 list = of_get_property(np, "atmel,mux-mask", &size);
817 if (!list) {
818 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
819 return -EINVAL;
820 }
821
822 size /= sizeof(*list);
823 if (!size || size % info->nbanks) {
824 dev_err(info->dev, "wrong mux mask array should be by %d\n", info->nbanks);
825 return -EINVAL;
826 }
827 info->nmux = size / info->nbanks;
828
829 info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL);
830 if (!info->mux_mask) {
831 dev_err(info->dev, "could not alloc mux_mask\n");
832 return -ENOMEM;
833 }
834
835 ret = of_property_read_u32_array(np, "atmel,mux-mask",
836 info->mux_mask, size);
837 if (ret)
838 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
839 return ret;
840 }
841
842 static int at91_pinctrl_parse_groups(struct device_node *np,
843 struct at91_pin_group *grp,
844 struct at91_pinctrl *info, u32 index)
845 {
846 struct at91_pmx_pin *pin;
847 int size;
848 const __be32 *list;
849 int i, j;
850
851 dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
852
853 /* Initialise group */
854 grp->name = np->name;
855
856 /*
857 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
858 * do sanity check and calculate pins number
859 */
860 list = of_get_property(np, "atmel,pins", &size);
861 /* we do not check return since it's safe node passed down */
862 size /= sizeof(*list);
863 if (!size || size % 4) {
864 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
865 return -EINVAL;
866 }
867
868 grp->npins = size / 4;
869 pin = grp->pins_conf = devm_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin),
870 GFP_KERNEL);
871 grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
872 GFP_KERNEL);
873 if (!grp->pins_conf || !grp->pins)
874 return -ENOMEM;
875
876 for (i = 0, j = 0; i < size; i += 4, j++) {
877 pin->bank = be32_to_cpu(*list++);
878 pin->pin = be32_to_cpu(*list++);
879 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
880 pin->mux = be32_to_cpu(*list++);
881 pin->conf = be32_to_cpu(*list++);
882
883 at91_pin_dbg(info->dev, pin);
884 pin++;
885 }
886
887 return 0;
888 }
889
890 static int at91_pinctrl_parse_functions(struct device_node *np,
891 struct at91_pinctrl *info, u32 index)
892 {
893 struct device_node *child;
894 struct at91_pmx_func *func;
895 struct at91_pin_group *grp;
896 int ret;
897 static u32 grp_index;
898 u32 i = 0;
899
900 dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
901
902 func = &info->functions[index];
903
904 /* Initialise function */
905 func->name = np->name;
906 func->ngroups = of_get_child_count(np);
907 if (func->ngroups <= 0) {
908 dev_err(info->dev, "no groups defined\n");
909 return -EINVAL;
910 }
911 func->groups = devm_kzalloc(info->dev,
912 func->ngroups * sizeof(char *), GFP_KERNEL);
913 if (!func->groups)
914 return -ENOMEM;
915
916 for_each_child_of_node(np, child) {
917 func->groups[i] = child->name;
918 grp = &info->groups[grp_index++];
919 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
920 if (ret)
921 return ret;
922 }
923
924 return 0;
925 }
926
927 static struct of_device_id at91_pinctrl_of_match[] = {
928 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
929 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
930 { /* sentinel */ }
931 };
932
933 static int at91_pinctrl_probe_dt(struct platform_device *pdev,
934 struct at91_pinctrl *info)
935 {
936 int ret = 0;
937 int i, j;
938 uint32_t *tmp;
939 struct device_node *np = pdev->dev.of_node;
940 struct device_node *child;
941
942 if (!np)
943 return -ENODEV;
944
945 info->dev = &pdev->dev;
946 info->ops = (struct at91_pinctrl_mux_ops *)
947 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
948 at91_pinctrl_child_count(info, np);
949
950 if (info->nbanks < 1) {
951 dev_err(&pdev->dev, "you need to specify atleast one gpio-controller\n");
952 return -EINVAL;
953 }
954
955 ret = at91_pinctrl_mux_mask(info, np);
956 if (ret)
957 return ret;
958
959 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
960
961 dev_dbg(&pdev->dev, "mux-mask\n");
962 tmp = info->mux_mask;
963 for (i = 0; i < info->nbanks; i++) {
964 for (j = 0; j < info->nmux; j++, tmp++) {
965 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
966 }
967 }
968
969 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
970 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
971 info->functions = devm_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func),
972 GFP_KERNEL);
973 if (!info->functions)
974 return -ENOMEM;
975
976 info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct at91_pin_group),
977 GFP_KERNEL);
978 if (!info->groups)
979 return -ENOMEM;
980
981 dev_dbg(&pdev->dev, "nbanks = %d\n", info->nbanks);
982 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
983 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
984
985 i = 0;
986
987 for_each_child_of_node(np, child) {
988 if (of_device_is_compatible(child, gpio_compat))
989 continue;
990 ret = at91_pinctrl_parse_functions(child, info, i++);
991 if (ret) {
992 dev_err(&pdev->dev, "failed to parse function\n");
993 return ret;
994 }
995 }
996
997 return 0;
998 }
999
1000 static int at91_pinctrl_probe(struct platform_device *pdev)
1001 {
1002 struct at91_pinctrl *info;
1003 struct pinctrl_pin_desc *pdesc;
1004 int ret, i, j, k;
1005
1006 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1007 if (!info)
1008 return -ENOMEM;
1009
1010 ret = at91_pinctrl_probe_dt(pdev, info);
1011 if (ret)
1012 return ret;
1013
1014 /*
1015 * We need all the GPIO drivers to probe FIRST, or we will not be able
1016 * to obtain references to the struct gpio_chip * for them, and we
1017 * need this to proceed.
1018 */
1019 for (i = 0; i < info->nbanks; i++) {
1020 if (!gpio_chips[i]) {
1021 dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
1022 devm_kfree(&pdev->dev, info);
1023 return -EPROBE_DEFER;
1024 }
1025 }
1026
1027 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1028 at91_pinctrl_desc.npins = info->nbanks * MAX_NB_GPIO_PER_BANK;
1029 at91_pinctrl_desc.pins = pdesc =
1030 devm_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, GFP_KERNEL);
1031
1032 if (!at91_pinctrl_desc.pins)
1033 return -ENOMEM;
1034
1035 for (i = 0 , k = 0; i < info->nbanks; i++) {
1036 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1037 pdesc->number = k;
1038 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1039 pdesc++;
1040 }
1041 }
1042
1043 platform_set_drvdata(pdev, info);
1044 info->pctl = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, info);
1045
1046 if (!info->pctl) {
1047 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1048 ret = -EINVAL;
1049 goto err;
1050 }
1051
1052 /* We will handle a range of GPIO pins */
1053 for (i = 0; i < info->nbanks; i++)
1054 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1055
1056 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1057
1058 return 0;
1059
1060 err:
1061 return ret;
1062 }
1063
1064 static int at91_pinctrl_remove(struct platform_device *pdev)
1065 {
1066 struct at91_pinctrl *info = platform_get_drvdata(pdev);
1067
1068 pinctrl_unregister(info->pctl);
1069
1070 return 0;
1071 }
1072
1073 static int at91_gpio_request(struct gpio_chip *chip, unsigned offset)
1074 {
1075 /*
1076 * Map back to global GPIO space and request muxing, the direction
1077 * parameter does not matter for this controller.
1078 */
1079 int gpio = chip->base + offset;
1080 int bank = chip->base / chip->ngpio;
1081
1082 dev_dbg(chip->dev, "%s:%d pio%c%d(%d)\n", __func__, __LINE__,
1083 'A' + bank, offset, gpio);
1084
1085 return pinctrl_request_gpio(gpio);
1086 }
1087
1088 static void at91_gpio_free(struct gpio_chip *chip, unsigned offset)
1089 {
1090 int gpio = chip->base + offset;
1091
1092 pinctrl_free_gpio(gpio);
1093 }
1094
1095 static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1096 {
1097 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1098 void __iomem *pio = at91_gpio->regbase;
1099 unsigned mask = 1 << offset;
1100
1101 writel_relaxed(mask, pio + PIO_ODR);
1102 return 0;
1103 }
1104
1105 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1106 {
1107 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1108 void __iomem *pio = at91_gpio->regbase;
1109 unsigned mask = 1 << offset;
1110 u32 pdsr;
1111
1112 pdsr = readl_relaxed(pio + PIO_PDSR);
1113 return (pdsr & mask) != 0;
1114 }
1115
1116 static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1117 int val)
1118 {
1119 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1120 void __iomem *pio = at91_gpio->regbase;
1121 unsigned mask = 1 << offset;
1122
1123 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1124 }
1125
1126 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1127 int val)
1128 {
1129 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1130 void __iomem *pio = at91_gpio->regbase;
1131 unsigned mask = 1 << offset;
1132
1133 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1134 writel_relaxed(mask, pio + PIO_OER);
1135
1136 return 0;
1137 }
1138
1139 static int at91_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
1140 {
1141 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1142 int virq;
1143
1144 if (offset < chip->ngpio)
1145 virq = irq_create_mapping(at91_gpio->domain, offset);
1146 else
1147 virq = -ENXIO;
1148
1149 dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
1150 chip->label, offset + chip->base, virq);
1151 return virq;
1152 }
1153
1154 #ifdef CONFIG_DEBUG_FS
1155 static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1156 {
1157 enum at91_mux mode;
1158 int i;
1159 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1160 void __iomem *pio = at91_gpio->regbase;
1161
1162 for (i = 0; i < chip->ngpio; i++) {
1163 unsigned pin = chip->base + i;
1164 unsigned mask = pin_to_mask(pin);
1165 const char *gpio_label;
1166 u32 pdsr;
1167
1168 gpio_label = gpiochip_is_requested(chip, i);
1169 if (!gpio_label)
1170 continue;
1171 mode = at91_gpio->ops->get_periph(pio, mask);
1172 seq_printf(s, "[%s] GPIO%s%d: ",
1173 gpio_label, chip->label, i);
1174 if (mode == AT91_MUX_GPIO) {
1175 pdsr = readl_relaxed(pio + PIO_PDSR);
1176
1177 seq_printf(s, "[gpio] %s\n",
1178 pdsr & mask ?
1179 "set" : "clear");
1180 } else {
1181 seq_printf(s, "[periph %c]\n",
1182 mode + 'A' - 1);
1183 }
1184 }
1185 }
1186 #else
1187 #define at91_gpio_dbg_show NULL
1188 #endif
1189
1190 /* Several AIC controller irqs are dispatched through this GPIO handler.
1191 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1192 * at91_set_gpio_input() then maybe enable its glitch filter.
1193 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1194 * handler.
1195 * First implementation always triggers on rising and falling edges
1196 * whereas the newer PIO3 can be additionally configured to trigger on
1197 * level, edge with any polarity.
1198 *
1199 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1200 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1201 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1202 */
1203
1204 static void gpio_irq_mask(struct irq_data *d)
1205 {
1206 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1207 void __iomem *pio = at91_gpio->regbase;
1208 unsigned mask = 1 << d->hwirq;
1209
1210 if (pio)
1211 writel_relaxed(mask, pio + PIO_IDR);
1212 }
1213
1214 static void gpio_irq_unmask(struct irq_data *d)
1215 {
1216 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1217 void __iomem *pio = at91_gpio->regbase;
1218 unsigned mask = 1 << d->hwirq;
1219
1220 if (pio)
1221 writel_relaxed(mask, pio + PIO_IER);
1222 }
1223
1224 static int gpio_irq_type(struct irq_data *d, unsigned type)
1225 {
1226 switch (type) {
1227 case IRQ_TYPE_NONE:
1228 case IRQ_TYPE_EDGE_BOTH:
1229 return 0;
1230 default:
1231 return -EINVAL;
1232 }
1233 }
1234
1235 /* Alternate irq type for PIO3 support */
1236 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1237 {
1238 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1239 void __iomem *pio = at91_gpio->regbase;
1240 unsigned mask = 1 << d->hwirq;
1241
1242 switch (type) {
1243 case IRQ_TYPE_EDGE_RISING:
1244 writel_relaxed(mask, pio + PIO_ESR);
1245 writel_relaxed(mask, pio + PIO_REHLSR);
1246 break;
1247 case IRQ_TYPE_EDGE_FALLING:
1248 writel_relaxed(mask, pio + PIO_ESR);
1249 writel_relaxed(mask, pio + PIO_FELLSR);
1250 break;
1251 case IRQ_TYPE_LEVEL_LOW:
1252 writel_relaxed(mask, pio + PIO_LSR);
1253 writel_relaxed(mask, pio + PIO_FELLSR);
1254 break;
1255 case IRQ_TYPE_LEVEL_HIGH:
1256 writel_relaxed(mask, pio + PIO_LSR);
1257 writel_relaxed(mask, pio + PIO_REHLSR);
1258 break;
1259 case IRQ_TYPE_EDGE_BOTH:
1260 /*
1261 * disable additional interrupt modes:
1262 * fall back to default behavior
1263 */
1264 writel_relaxed(mask, pio + PIO_AIMDR);
1265 return 0;
1266 case IRQ_TYPE_NONE:
1267 default:
1268 pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq));
1269 return -EINVAL;
1270 }
1271
1272 /* enable additional interrupt modes */
1273 writel_relaxed(mask, pio + PIO_AIMER);
1274
1275 return 0;
1276 }
1277
1278 #ifdef CONFIG_PM
1279
1280 static u32 wakeups[MAX_GPIO_BANKS];
1281 static u32 backups[MAX_GPIO_BANKS];
1282
1283 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1284 {
1285 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1286 unsigned bank = at91_gpio->pioc_idx;
1287 unsigned mask = 1 << d->hwirq;
1288
1289 if (unlikely(bank >= MAX_GPIO_BANKS))
1290 return -EINVAL;
1291
1292 if (state)
1293 wakeups[bank] |= mask;
1294 else
1295 wakeups[bank] &= ~mask;
1296
1297 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1298
1299 return 0;
1300 }
1301
1302 void at91_pinctrl_gpio_suspend(void)
1303 {
1304 int i;
1305
1306 for (i = 0; i < gpio_banks; i++) {
1307 void __iomem *pio;
1308
1309 if (!gpio_chips[i])
1310 continue;
1311
1312 pio = gpio_chips[i]->regbase;
1313
1314 backups[i] = __raw_readl(pio + PIO_IMR);
1315 __raw_writel(backups[i], pio + PIO_IDR);
1316 __raw_writel(wakeups[i], pio + PIO_IER);
1317
1318 if (!wakeups[i]) {
1319 clk_unprepare(gpio_chips[i]->clock);
1320 clk_disable(gpio_chips[i]->clock);
1321 } else {
1322 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
1323 'A'+i, wakeups[i]);
1324 }
1325 }
1326 }
1327
1328 void at91_pinctrl_gpio_resume(void)
1329 {
1330 int i;
1331
1332 for (i = 0; i < gpio_banks; i++) {
1333 void __iomem *pio;
1334
1335 if (!gpio_chips[i])
1336 continue;
1337
1338 pio = gpio_chips[i]->regbase;
1339
1340 if (!wakeups[i]) {
1341 if (clk_prepare(gpio_chips[i]->clock) == 0)
1342 clk_enable(gpio_chips[i]->clock);
1343 }
1344
1345 __raw_writel(wakeups[i], pio + PIO_IDR);
1346 __raw_writel(backups[i], pio + PIO_IER);
1347 }
1348 }
1349
1350 #else
1351 #define gpio_irq_set_wake NULL
1352 #endif /* CONFIG_PM */
1353
1354 static struct irq_chip gpio_irqchip = {
1355 .name = "GPIO",
1356 .irq_disable = gpio_irq_mask,
1357 .irq_mask = gpio_irq_mask,
1358 .irq_unmask = gpio_irq_unmask,
1359 /* .irq_set_type is set dynamically */
1360 .irq_set_wake = gpio_irq_set_wake,
1361 };
1362
1363 static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
1364 {
1365 struct irq_chip *chip = irq_desc_get_chip(desc);
1366 struct irq_data *idata = irq_desc_get_irq_data(desc);
1367 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata);
1368 void __iomem *pio = at91_gpio->regbase;
1369 unsigned long isr;
1370 int n;
1371
1372 chained_irq_enter(chip, desc);
1373 for (;;) {
1374 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
1375 * When there none are pending, we're finished unless we need
1376 * to process multiple banks (like ID_PIOCDE on sam9263).
1377 */
1378 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1379 if (!isr) {
1380 if (!at91_gpio->next)
1381 break;
1382 at91_gpio = at91_gpio->next;
1383 pio = at91_gpio->regbase;
1384 continue;
1385 }
1386
1387 for_each_set_bit(n, &isr, BITS_PER_LONG) {
1388 generic_handle_irq(irq_find_mapping(at91_gpio->domain, n));
1389 }
1390 }
1391 chained_irq_exit(chip, desc);
1392 /* now it may re-trigger */
1393 }
1394
1395 /*
1396 * This lock class tells lockdep that GPIO irqs are in a different
1397 * category than their parents, so it won't report false recursion.
1398 */
1399 static struct lock_class_key gpio_lock_class;
1400
1401 static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
1402 irq_hw_number_t hw)
1403 {
1404 struct at91_gpio_chip *at91_gpio = h->host_data;
1405
1406 irq_set_lockdep_class(virq, &gpio_lock_class);
1407
1408 /*
1409 * Can use the "simple" and not "edge" handler since it's
1410 * shorter, and the AIC handles interrupts sanely.
1411 */
1412 irq_set_chip_and_handler(virq, &gpio_irqchip,
1413 handle_simple_irq);
1414 set_irq_flags(virq, IRQF_VALID);
1415 irq_set_chip_data(virq, at91_gpio);
1416
1417 return 0;
1418 }
1419
1420 static int at91_gpio_irq_domain_xlate(struct irq_domain *d,
1421 struct device_node *ctrlr,
1422 const u32 *intspec, unsigned int intsize,
1423 irq_hw_number_t *out_hwirq,
1424 unsigned int *out_type)
1425 {
1426 struct at91_gpio_chip *at91_gpio = d->host_data;
1427 int ret;
1428 int pin = at91_gpio->chip.base + intspec[0];
1429
1430 if (WARN_ON(intsize < 2))
1431 return -EINVAL;
1432 *out_hwirq = intspec[0];
1433 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1434
1435 ret = gpio_request(pin, ctrlr->full_name);
1436 if (ret)
1437 return ret;
1438
1439 ret = gpio_direction_input(pin);
1440 if (ret)
1441 return ret;
1442
1443 return 0;
1444 }
1445
1446 static struct irq_domain_ops at91_gpio_ops = {
1447 .map = at91_gpio_irq_map,
1448 .xlate = at91_gpio_irq_domain_xlate,
1449 };
1450
1451 static int at91_gpio_of_irq_setup(struct device_node *node,
1452 struct at91_gpio_chip *at91_gpio)
1453 {
1454 struct at91_gpio_chip *prev = NULL;
1455 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
1456
1457 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1458
1459 /* Setup proper .irq_set_type function */
1460 gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type;
1461
1462 /* Disable irqs of this PIO controller */
1463 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1464
1465 /* Setup irq domain */
1466 at91_gpio->domain = irq_domain_add_linear(node, at91_gpio->chip.ngpio,
1467 &at91_gpio_ops, at91_gpio);
1468 if (!at91_gpio->domain)
1469 panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n",
1470 at91_gpio->pioc_idx);
1471
1472 /* Setup chained handler */
1473 if (at91_gpio->pioc_idx)
1474 prev = gpio_chips[at91_gpio->pioc_idx - 1];
1475
1476 /* The toplevel handler handles one bank of GPIOs, except
1477 * on some SoC it can handles up to three...
1478 * We only set up the handler for the first of the list.
1479 */
1480 if (prev && prev->next == at91_gpio)
1481 return 0;
1482
1483 irq_set_chip_data(at91_gpio->pioc_virq, at91_gpio);
1484 irq_set_chained_handler(at91_gpio->pioc_virq, gpio_irq_handler);
1485
1486 return 0;
1487 }
1488
1489 /* This structure is replicated for each GPIO block allocated at probe time */
1490 static struct gpio_chip at91_gpio_template = {
1491 .request = at91_gpio_request,
1492 .free = at91_gpio_free,
1493 .direction_input = at91_gpio_direction_input,
1494 .get = at91_gpio_get,
1495 .direction_output = at91_gpio_direction_output,
1496 .set = at91_gpio_set,
1497 .to_irq = at91_gpio_to_irq,
1498 .dbg_show = at91_gpio_dbg_show,
1499 .can_sleep = 0,
1500 .ngpio = MAX_NB_GPIO_PER_BANK,
1501 };
1502
1503 static void at91_gpio_probe_fixup(void)
1504 {
1505 unsigned i;
1506 struct at91_gpio_chip *at91_gpio, *last = NULL;
1507
1508 for (i = 0; i < gpio_banks; i++) {
1509 at91_gpio = gpio_chips[i];
1510
1511 /*
1512 * GPIO controller are grouped on some SoC:
1513 * PIOC, PIOD and PIOE can share the same IRQ line
1514 */
1515 if (last && last->pioc_virq == at91_gpio->pioc_virq)
1516 last->next = at91_gpio;
1517 last = at91_gpio;
1518 }
1519 }
1520
1521 static struct of_device_id at91_gpio_of_match[] = {
1522 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1523 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1524 { /* sentinel */ }
1525 };
1526
1527 static int at91_gpio_probe(struct platform_device *pdev)
1528 {
1529 struct device_node *np = pdev->dev.of_node;
1530 struct resource *res;
1531 struct at91_gpio_chip *at91_chip = NULL;
1532 struct gpio_chip *chip;
1533 struct pinctrl_gpio_range *range;
1534 int ret = 0;
1535 int irq, i;
1536 int alias_idx = of_alias_get_id(np, "gpio");
1537 uint32_t ngpio;
1538 char **names;
1539
1540 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1541 if (gpio_chips[alias_idx]) {
1542 ret = -EBUSY;
1543 goto err;
1544 }
1545
1546 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1547 if (!res) {
1548 ret = -ENOENT;
1549 goto err;
1550 }
1551
1552 irq = platform_get_irq(pdev, 0);
1553 if (irq < 0) {
1554 ret = irq;
1555 goto err;
1556 }
1557
1558 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1559 if (!at91_chip) {
1560 ret = -ENOMEM;
1561 goto err;
1562 }
1563
1564 at91_chip->regbase = devm_ioremap_resource(&pdev->dev, res);
1565 if (IS_ERR(at91_chip->regbase)) {
1566 ret = PTR_ERR(at91_chip->regbase);
1567 goto err;
1568 }
1569
1570 at91_chip->ops = (struct at91_pinctrl_mux_ops *)
1571 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1572 at91_chip->pioc_virq = irq;
1573 at91_chip->pioc_idx = alias_idx;
1574
1575 at91_chip->clock = clk_get(&pdev->dev, NULL);
1576 if (IS_ERR(at91_chip->clock)) {
1577 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1578 goto err;
1579 }
1580
1581 if (clk_prepare(at91_chip->clock))
1582 goto clk_prep_err;
1583
1584 /* enable PIO controller's clock */
1585 if (clk_enable(at91_chip->clock)) {
1586 dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
1587 goto clk_err;
1588 }
1589
1590 at91_chip->chip = at91_gpio_template;
1591
1592 chip = &at91_chip->chip;
1593 chip->of_node = np;
1594 chip->label = dev_name(&pdev->dev);
1595 chip->dev = &pdev->dev;
1596 chip->owner = THIS_MODULE;
1597 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1598
1599 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1600 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1601 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1602 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1603 else
1604 chip->ngpio = ngpio;
1605 }
1606
1607 names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
1608 GFP_KERNEL);
1609
1610 if (!names) {
1611 ret = -ENOMEM;
1612 goto clk_err;
1613 }
1614
1615 for (i = 0; i < chip->ngpio; i++)
1616 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1617
1618 chip->names = (const char *const *)names;
1619
1620 range = &at91_chip->range;
1621 range->name = chip->label;
1622 range->id = alias_idx;
1623 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1624
1625 range->npins = chip->ngpio;
1626 range->gc = chip;
1627
1628 ret = gpiochip_add(chip);
1629 if (ret)
1630 goto clk_err;
1631
1632 gpio_chips[alias_idx] = at91_chip;
1633 gpio_banks = max(gpio_banks, alias_idx + 1);
1634
1635 at91_gpio_probe_fixup();
1636
1637 at91_gpio_of_irq_setup(np, at91_chip);
1638
1639 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1640
1641 return 0;
1642
1643 clk_err:
1644 clk_unprepare(at91_chip->clock);
1645 clk_prep_err:
1646 clk_put(at91_chip->clock);
1647 err:
1648 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1649
1650 return ret;
1651 }
1652
1653 static struct platform_driver at91_gpio_driver = {
1654 .driver = {
1655 .name = "gpio-at91",
1656 .owner = THIS_MODULE,
1657 .of_match_table = of_match_ptr(at91_gpio_of_match),
1658 },
1659 .probe = at91_gpio_probe,
1660 };
1661
1662 static struct platform_driver at91_pinctrl_driver = {
1663 .driver = {
1664 .name = "pinctrl-at91",
1665 .owner = THIS_MODULE,
1666 .of_match_table = of_match_ptr(at91_pinctrl_of_match),
1667 },
1668 .probe = at91_pinctrl_probe,
1669 .remove = at91_pinctrl_remove,
1670 };
1671
1672 static int __init at91_pinctrl_init(void)
1673 {
1674 int ret;
1675
1676 ret = platform_driver_register(&at91_gpio_driver);
1677 if (ret)
1678 return ret;
1679 return platform_driver_register(&at91_pinctrl_driver);
1680 }
1681 arch_initcall(at91_pinctrl_init);
1682
1683 static void __exit at91_pinctrl_exit(void)
1684 {
1685 platform_driver_unregister(&at91_pinctrl_driver);
1686 }
1687
1688 module_exit(at91_pinctrl_exit);
1689 MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>");
1690 MODULE_DESCRIPTION("Atmel AT91 pinctrl driver");
1691 MODULE_LICENSE("GPL v2");
kernel source for telekom puls (alcatel/mediatek)