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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / pinctrl / pinctrl-at91.c
bloba7549c4c83b43da6d5c6d108eeec41f95d7710e8
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_GPIO_BANKS 5
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 is_on);
149 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
150 void (*set_debounce)(void __iomem *pio, unsigned mask, bool is_on, u32 div);
151 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
152 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool is_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 to 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 const 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 bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
422 {
423 if ((__raw_readl(pio + PIO_IFSR) >> pin) & 0x1)
424 return !((__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1);
425
426 return false;
427 }
428
429 static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
430 {
431 if (is_on)
432 __raw_writel(mask, pio + PIO_IFSCDR);
433 at91_mux_set_deglitch(pio, mask, is_on);
434 }
435
436 static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
437 {
438 *div = __raw_readl(pio + PIO_SCDR);
439
440 return ((__raw_readl(pio + PIO_IFSR) >> pin) & 0x1) &&
441 ((__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1);
442 }
443
444 static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
445 bool is_on, u32 div)
446 {
447 if (is_on) {
448 __raw_writel(mask, pio + PIO_IFSCER);
449 __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
450 __raw_writel(mask, pio + PIO_IFER);
451 } else
452 __raw_writel(mask, pio + PIO_IFSCDR);
453 }
454
455 static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
456 {
457 return !((__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1);
458 }
459
460 static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
461 {
462 __raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
463 }
464
465 static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
466 {
467 __raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
468 }
469
470 static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
471 {
472 return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1;
473 }
474
475 static struct at91_pinctrl_mux_ops at91rm9200_ops = {
476 .get_periph = at91_mux_get_periph,
477 .mux_A_periph = at91_mux_set_A_periph,
478 .mux_B_periph = at91_mux_set_B_periph,
479 .get_deglitch = at91_mux_get_deglitch,
480 .set_deglitch = at91_mux_set_deglitch,
481 .irq_type = gpio_irq_type,
482 };
483
484 static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
485 .get_periph = at91_mux_pio3_get_periph,
486 .mux_A_periph = at91_mux_pio3_set_A_periph,
487 .mux_B_periph = at91_mux_pio3_set_B_periph,
488 .mux_C_periph = at91_mux_pio3_set_C_periph,
489 .mux_D_periph = at91_mux_pio3_set_D_periph,
490 .get_deglitch = at91_mux_pio3_get_deglitch,
491 .set_deglitch = at91_mux_pio3_set_deglitch,
492 .get_debounce = at91_mux_pio3_get_debounce,
493 .set_debounce = at91_mux_pio3_set_debounce,
494 .get_pulldown = at91_mux_pio3_get_pulldown,
495 .set_pulldown = at91_mux_pio3_set_pulldown,
496 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
497 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
498 .irq_type = alt_gpio_irq_type,
499 };
500
501 static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
502 {
503 if (pin->mux) {
504 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lu\n",
505 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
506 } else {
507 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lu\n",
508 pin->bank + 'A', pin->pin, pin->conf);
509 }
510 }
511
512 static int pin_check_config(struct at91_pinctrl *info, const char *name,
513 int index, const struct at91_pmx_pin *pin)
514 {
515 int mux;
516
517 /* check if it's a valid config */
518 if (pin->bank >= info->nbanks) {
519 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
520 name, index, pin->bank, info->nbanks);
521 return -EINVAL;
522 }
523
524 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
525 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
526 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
527 return -EINVAL;
528 }
529
530 if (!pin->mux)
531 return 0;
532
533 mux = pin->mux - 1;
534
535 if (mux >= info->nmux) {
536 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
537 name, index, mux, info->nmux);
538 return -EINVAL;
539 }
540
541 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
542 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
543 name, index, mux, pin->bank + 'A', pin->pin);
544 return -EINVAL;
545 }
546
547 return 0;
548 }
549
550 static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
551 {
552 writel_relaxed(mask, pio + PIO_PDR);
553 }
554
555 static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
556 {
557 writel_relaxed(mask, pio + PIO_PER);
558 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
559 }
560
561 static int at91_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
562 unsigned group)
563 {
564 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
565 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
566 const struct at91_pmx_pin *pin;
567 uint32_t npins = info->groups[group].npins;
568 int i, ret;
569 unsigned mask;
570 void __iomem *pio;
571
572 dev_dbg(info->dev, "enable function %s group %s\n",
573 info->functions[selector].name, info->groups[group].name);
574
575 /* first check that all the pins of the group are valid with a valid
576 * parameter */
577 for (i = 0; i < npins; i++) {
578 pin = &pins_conf[i];
579 ret = pin_check_config(info, info->groups[group].name, i, pin);
580 if (ret)
581 return ret;
582 }
583
584 for (i = 0; i < npins; i++) {
585 pin = &pins_conf[i];
586 at91_pin_dbg(info->dev, pin);
587 pio = pin_to_controller(info, pin->bank);
588 mask = pin_to_mask(pin->pin);
589 at91_mux_disable_interrupt(pio, mask);
590 switch (pin->mux) {
591 case AT91_MUX_GPIO:
592 at91_mux_gpio_enable(pio, mask, 1);
593 break;
594 case AT91_MUX_PERIPH_A:
595 info->ops->mux_A_periph(pio, mask);
596 break;
597 case AT91_MUX_PERIPH_B:
598 info->ops->mux_B_periph(pio, mask);
599 break;
600 case AT91_MUX_PERIPH_C:
601 if (!info->ops->mux_C_periph)
602 return -EINVAL;
603 info->ops->mux_C_periph(pio, mask);
604 break;
605 case AT91_MUX_PERIPH_D:
606 if (!info->ops->mux_D_periph)
607 return -EINVAL;
608 info->ops->mux_D_periph(pio, mask);
609 break;
610 }
611 if (pin->mux)
612 at91_mux_gpio_disable(pio, mask);
613 }
614
615 return 0;
616 }
617
618 static void at91_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
619 unsigned group)
620 {
621 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
622 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
623 const struct at91_pmx_pin *pin;
624 uint32_t npins = info->groups[group].npins;
625 int i;
626 unsigned mask;
627 void __iomem *pio;
628
629 for (i = 0; i < npins; i++) {
630 pin = &pins_conf[i];
631 at91_pin_dbg(info->dev, pin);
632 pio = pin_to_controller(info, pin->bank);
633 mask = pin_to_mask(pin->pin);
634 at91_mux_gpio_enable(pio, mask, 1);
635 }
636 }
637
638 static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
639 {
640 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
641
642 return info->nfunctions;
643 }
644
645 static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
646 unsigned selector)
647 {
648 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
649
650 return info->functions[selector].name;
651 }
652
653 static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
654 const char * const **groups,
655 unsigned * const num_groups)
656 {
657 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
658
659 *groups = info->functions[selector].groups;
660 *num_groups = info->functions[selector].ngroups;
661
662 return 0;
663 }
664
665 static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
666 struct pinctrl_gpio_range *range,
667 unsigned offset)
668 {
669 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
670 struct at91_gpio_chip *at91_chip;
671 struct gpio_chip *chip;
672 unsigned mask;
673
674 if (!range) {
675 dev_err(npct->dev, "invalid range\n");
676 return -EINVAL;
677 }
678 if (!range->gc) {
679 dev_err(npct->dev, "missing GPIO chip in range\n");
680 return -EINVAL;
681 }
682 chip = range->gc;
683 at91_chip = container_of(chip, struct at91_gpio_chip, chip);
684
685 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
686
687 mask = 1 << (offset - chip->base);
688
689 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
690 offset, 'A' + range->id, offset - chip->base, mask);
691
692 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
693
694 return 0;
695 }
696
697 static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
698 struct pinctrl_gpio_range *range,
699 unsigned offset)
700 {
701 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
702
703 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
704 /* Set the pin to some default state, GPIO is usually default */
705 }
706
707 static const struct pinmux_ops at91_pmx_ops = {
708 .get_functions_count = at91_pmx_get_funcs_count,
709 .get_function_name = at91_pmx_get_func_name,
710 .get_function_groups = at91_pmx_get_groups,
711 .enable = at91_pmx_enable,
712 .disable = at91_pmx_disable,
713 .gpio_request_enable = at91_gpio_request_enable,
714 .gpio_disable_free = at91_gpio_disable_free,
715 };
716
717 static int at91_pinconf_get(struct pinctrl_dev *pctldev,
718 unsigned pin_id, unsigned long *config)
719 {
720 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
721 void __iomem *pio;
722 unsigned pin;
723 int div;
724
725 dev_dbg(info->dev, "%s:%d, pin_id=%d, config=0x%lx", __func__, __LINE__, pin_id, *config);
726 pio = pin_to_controller(info, pin_to_bank(pin_id));
727 pin = pin_id % MAX_NB_GPIO_PER_BANK;
728
729 if (at91_mux_get_multidrive(pio, pin))
730 *config |= MULTI_DRIVE;
731
732 if (at91_mux_get_pullup(pio, pin))
733 *config |= PULL_UP;
734
735 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
736 *config |= DEGLITCH;
737 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
738 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
739 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
740 *config |= PULL_DOWN;
741 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
742 *config |= DIS_SCHMIT;
743
744 return 0;
745 }
746
747 static int at91_pinconf_set(struct pinctrl_dev *pctldev,
748 unsigned pin_id, unsigned long *configs,
749 unsigned num_configs)
750 {
751 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
752 unsigned mask;
753 void __iomem *pio;
754 int i;
755 unsigned long config;
756
757 for (i = 0; i < num_configs; i++) {
758 config = configs[i];
759
760 dev_dbg(info->dev,
761 "%s:%d, pin_id=%d, config=0x%lx",
762 __func__, __LINE__, pin_id, config);
763 pio = pin_to_controller(info, pin_to_bank(pin_id));
764 mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK);
765
766 if (config & PULL_UP && config & PULL_DOWN)
767 return -EINVAL;
768
769 at91_mux_set_pullup(pio, mask, config & PULL_UP);
770 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
771 if (info->ops->set_deglitch)
772 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
773 if (info->ops->set_debounce)
774 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
775 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
776 if (info->ops->set_pulldown)
777 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
778 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
779 info->ops->disable_schmitt_trig(pio, mask);
780
781 } /* for each config */
782
783 return 0;
784 }
785
786 static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
787 struct seq_file *s, unsigned pin_id)
788 {
789
790 }
791
792 static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
793 struct seq_file *s, unsigned group)
794 {
795 }
796
797 static const struct pinconf_ops at91_pinconf_ops = {
798 .pin_config_get = at91_pinconf_get,
799 .pin_config_set = at91_pinconf_set,
800 .pin_config_dbg_show = at91_pinconf_dbg_show,
801 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
802 };
803
804 static struct pinctrl_desc at91_pinctrl_desc = {
805 .pctlops = &at91_pctrl_ops,
806 .pmxops = &at91_pmx_ops,
807 .confops = &at91_pinconf_ops,
808 .owner = THIS_MODULE,
809 };
810
811 static const char *gpio_compat = "atmel,at91rm9200-gpio";
812
813 static void at91_pinctrl_child_count(struct at91_pinctrl *info,
814 struct device_node *np)
815 {
816 struct device_node *child;
817
818 for_each_child_of_node(np, child) {
819 if (of_device_is_compatible(child, gpio_compat)) {
820 info->nbanks++;
821 } else {
822 info->nfunctions++;
823 info->ngroups += of_get_child_count(child);
824 }
825 }
826 }
827
828 static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
829 struct device_node *np)
830 {
831 int ret = 0;
832 int size;
833 const __be32 *list;
834
835 list = of_get_property(np, "atmel,mux-mask", &size);
836 if (!list) {
837 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
838 return -EINVAL;
839 }
840
841 size /= sizeof(*list);
842 if (!size || size % info->nbanks) {
843 dev_err(info->dev, "wrong mux mask array should be by %d\n", info->nbanks);
844 return -EINVAL;
845 }
846 info->nmux = size / info->nbanks;
847
848 info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL);
849 if (!info->mux_mask) {
850 dev_err(info->dev, "could not alloc mux_mask\n");
851 return -ENOMEM;
852 }
853
854 ret = of_property_read_u32_array(np, "atmel,mux-mask",
855 info->mux_mask, size);
856 if (ret)
857 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
858 return ret;
859 }
860
861 static int at91_pinctrl_parse_groups(struct device_node *np,
862 struct at91_pin_group *grp,
863 struct at91_pinctrl *info, u32 index)
864 {
865 struct at91_pmx_pin *pin;
866 int size;
867 const __be32 *list;
868 int i, j;
869
870 dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
871
872 /* Initialise group */
873 grp->name = np->name;
874
875 /*
876 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
877 * do sanity check and calculate pins number
878 */
879 list = of_get_property(np, "atmel,pins", &size);
880 /* we do not check return since it's safe node passed down */
881 size /= sizeof(*list);
882 if (!size || size % 4) {
883 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
884 return -EINVAL;
885 }
886
887 grp->npins = size / 4;
888 pin = grp->pins_conf = devm_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin),
889 GFP_KERNEL);
890 grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
891 GFP_KERNEL);
892 if (!grp->pins_conf || !grp->pins)
893 return -ENOMEM;
894
895 for (i = 0, j = 0; i < size; i += 4, j++) {
896 pin->bank = be32_to_cpu(*list++);
897 pin->pin = be32_to_cpu(*list++);
898 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
899 pin->mux = be32_to_cpu(*list++);
900 pin->conf = be32_to_cpu(*list++);
901
902 at91_pin_dbg(info->dev, pin);
903 pin++;
904 }
905
906 return 0;
907 }
908
909 static int at91_pinctrl_parse_functions(struct device_node *np,
910 struct at91_pinctrl *info, u32 index)
911 {
912 struct device_node *child;
913 struct at91_pmx_func *func;
914 struct at91_pin_group *grp;
915 int ret;
916 static u32 grp_index;
917 u32 i = 0;
918
919 dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
920
921 func = &info->functions[index];
922
923 /* Initialise function */
924 func->name = np->name;
925 func->ngroups = of_get_child_count(np);
926 if (func->ngroups <= 0) {
927 dev_err(info->dev, "no groups defined\n");
928 return -EINVAL;
929 }
930 func->groups = devm_kzalloc(info->dev,
931 func->ngroups * sizeof(char *), GFP_KERNEL);
932 if (!func->groups)
933 return -ENOMEM;
934
935 for_each_child_of_node(np, child) {
936 func->groups[i] = child->name;
937 grp = &info->groups[grp_index++];
938 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
939 if (ret)
940 return ret;
941 }
942
943 return 0;
944 }
945
946 static struct of_device_id at91_pinctrl_of_match[] = {
947 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
948 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
949 { /* sentinel */ }
950 };
951
952 static int at91_pinctrl_probe_dt(struct platform_device *pdev,
953 struct at91_pinctrl *info)
954 {
955 int ret = 0;
956 int i, j;
957 uint32_t *tmp;
958 struct device_node *np = pdev->dev.of_node;
959 struct device_node *child;
960
961 if (!np)
962 return -ENODEV;
963
964 info->dev = &pdev->dev;
965 info->ops = (struct at91_pinctrl_mux_ops *)
966 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
967 at91_pinctrl_child_count(info, np);
968
969 if (info->nbanks < 1) {
970 dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n");
971 return -EINVAL;
972 }
973
974 ret = at91_pinctrl_mux_mask(info, np);
975 if (ret)
976 return ret;
977
978 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
979
980 dev_dbg(&pdev->dev, "mux-mask\n");
981 tmp = info->mux_mask;
982 for (i = 0; i < info->nbanks; i++) {
983 for (j = 0; j < info->nmux; j++, tmp++) {
984 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
985 }
986 }
987
988 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
989 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
990 info->functions = devm_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func),
991 GFP_KERNEL);
992 if (!info->functions)
993 return -ENOMEM;
994
995 info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct at91_pin_group),
996 GFP_KERNEL);
997 if (!info->groups)
998 return -ENOMEM;
999
1000 dev_dbg(&pdev->dev, "nbanks = %d\n", info->nbanks);
1001 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1002 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1003
1004 i = 0;
1005
1006 for_each_child_of_node(np, child) {
1007 if (of_device_is_compatible(child, gpio_compat))
1008 continue;
1009 ret = at91_pinctrl_parse_functions(child, info, i++);
1010 if (ret) {
1011 dev_err(&pdev->dev, "failed to parse function\n");
1012 return ret;
1013 }
1014 }
1015
1016 return 0;
1017 }
1018
1019 static int at91_pinctrl_probe(struct platform_device *pdev)
1020 {
1021 struct at91_pinctrl *info;
1022 struct pinctrl_pin_desc *pdesc;
1023 int ret, i, j, k;
1024
1025 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1026 if (!info)
1027 return -ENOMEM;
1028
1029 ret = at91_pinctrl_probe_dt(pdev, info);
1030 if (ret)
1031 return ret;
1032
1033 /*
1034 * We need all the GPIO drivers to probe FIRST, or we will not be able
1035 * to obtain references to the struct gpio_chip * for them, and we
1036 * need this to proceed.
1037 */
1038 for (i = 0; i < info->nbanks; i++) {
1039 if (!gpio_chips[i]) {
1040 dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
1041 devm_kfree(&pdev->dev, info);
1042 return -EPROBE_DEFER;
1043 }
1044 }
1045
1046 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1047 at91_pinctrl_desc.npins = info->nbanks * MAX_NB_GPIO_PER_BANK;
1048 at91_pinctrl_desc.pins = pdesc =
1049 devm_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, GFP_KERNEL);
1050
1051 if (!at91_pinctrl_desc.pins)
1052 return -ENOMEM;
1053
1054 for (i = 0 , k = 0; i < info->nbanks; i++) {
1055 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1056 pdesc->number = k;
1057 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1058 pdesc++;
1059 }
1060 }
1061
1062 platform_set_drvdata(pdev, info);
1063 info->pctl = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, info);
1064
1065 if (!info->pctl) {
1066 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1067 ret = -EINVAL;
1068 goto err;
1069 }
1070
1071 /* We will handle a range of GPIO pins */
1072 for (i = 0; i < info->nbanks; i++)
1073 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1074
1075 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1076
1077 return 0;
1078
1079 err:
1080 return ret;
1081 }
1082
1083 static int at91_pinctrl_remove(struct platform_device *pdev)
1084 {
1085 struct at91_pinctrl *info = platform_get_drvdata(pdev);
1086
1087 pinctrl_unregister(info->pctl);
1088
1089 return 0;
1090 }
1091
1092 static int at91_gpio_request(struct gpio_chip *chip, unsigned offset)
1093 {
1094 /*
1095 * Map back to global GPIO space and request muxing, the direction
1096 * parameter does not matter for this controller.
1097 */
1098 int gpio = chip->base + offset;
1099 int bank = chip->base / chip->ngpio;
1100
1101 dev_dbg(chip->dev, "%s:%d pio%c%d(%d)\n", __func__, __LINE__,
1102 'A' + bank, offset, gpio);
1103
1104 return pinctrl_request_gpio(gpio);
1105 }
1106
1107 static void at91_gpio_free(struct gpio_chip *chip, unsigned offset)
1108 {
1109 int gpio = chip->base + offset;
1110
1111 pinctrl_free_gpio(gpio);
1112 }
1113
1114 static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1115 {
1116 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1117 void __iomem *pio = at91_gpio->regbase;
1118 unsigned mask = 1 << offset;
1119
1120 writel_relaxed(mask, pio + PIO_ODR);
1121 return 0;
1122 }
1123
1124 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1125 {
1126 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1127 void __iomem *pio = at91_gpio->regbase;
1128 unsigned mask = 1 << offset;
1129 u32 pdsr;
1130
1131 pdsr = readl_relaxed(pio + PIO_PDSR);
1132 return (pdsr & mask) != 0;
1133 }
1134
1135 static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1136 int val)
1137 {
1138 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1139 void __iomem *pio = at91_gpio->regbase;
1140 unsigned mask = 1 << offset;
1141
1142 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1143 }
1144
1145 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1146 int val)
1147 {
1148 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1149 void __iomem *pio = at91_gpio->regbase;
1150 unsigned mask = 1 << offset;
1151
1152 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1153 writel_relaxed(mask, pio + PIO_OER);
1154
1155 return 0;
1156 }
1157
1158 static int at91_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
1159 {
1160 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1161 int virq;
1162
1163 if (offset < chip->ngpio)
1164 virq = irq_create_mapping(at91_gpio->domain, offset);
1165 else
1166 virq = -ENXIO;
1167
1168 dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
1169 chip->label, offset + chip->base, virq);
1170 return virq;
1171 }
1172
1173 #ifdef CONFIG_DEBUG_FS
1174 static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1175 {
1176 enum at91_mux mode;
1177 int i;
1178 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1179 void __iomem *pio = at91_gpio->regbase;
1180
1181 for (i = 0; i < chip->ngpio; i++) {
1182 unsigned pin = chip->base + i;
1183 unsigned mask = pin_to_mask(pin);
1184 const char *gpio_label;
1185 u32 pdsr;
1186
1187 gpio_label = gpiochip_is_requested(chip, i);
1188 if (!gpio_label)
1189 continue;
1190 mode = at91_gpio->ops->get_periph(pio, mask);
1191 seq_printf(s, "[%s] GPIO%s%d: ",
1192 gpio_label, chip->label, i);
1193 if (mode == AT91_MUX_GPIO) {
1194 pdsr = readl_relaxed(pio + PIO_PDSR);
1195
1196 seq_printf(s, "[gpio] %s\n",
1197 pdsr & mask ?
1198 "set" : "clear");
1199 } else {
1200 seq_printf(s, "[periph %c]\n",
1201 mode + 'A' - 1);
1202 }
1203 }
1204 }
1205 #else
1206 #define at91_gpio_dbg_show NULL
1207 #endif
1208
1209 /* Several AIC controller irqs are dispatched through this GPIO handler.
1210 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1211 * at91_set_gpio_input() then maybe enable its glitch filter.
1212 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1213 * handler.
1214 * First implementation always triggers on rising and falling edges
1215 * whereas the newer PIO3 can be additionally configured to trigger on
1216 * level, edge with any polarity.
1217 *
1218 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1219 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1220 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1221 */
1222
1223 static void gpio_irq_mask(struct irq_data *d)
1224 {
1225 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1226 void __iomem *pio = at91_gpio->regbase;
1227 unsigned mask = 1 << d->hwirq;
1228
1229 if (pio)
1230 writel_relaxed(mask, pio + PIO_IDR);
1231 }
1232
1233 static void gpio_irq_unmask(struct irq_data *d)
1234 {
1235 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1236 void __iomem *pio = at91_gpio->regbase;
1237 unsigned mask = 1 << d->hwirq;
1238
1239 if (pio)
1240 writel_relaxed(mask, pio + PIO_IER);
1241 }
1242
1243 static int gpio_irq_type(struct irq_data *d, unsigned type)
1244 {
1245 switch (type) {
1246 case IRQ_TYPE_NONE:
1247 case IRQ_TYPE_EDGE_BOTH:
1248 return 0;
1249 default:
1250 return -EINVAL;
1251 }
1252 }
1253
1254 /* Alternate irq type for PIO3 support */
1255 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1256 {
1257 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1258 void __iomem *pio = at91_gpio->regbase;
1259 unsigned mask = 1 << d->hwirq;
1260
1261 switch (type) {
1262 case IRQ_TYPE_EDGE_RISING:
1263 irq_set_handler(d->irq, handle_simple_irq);
1264 writel_relaxed(mask, pio + PIO_ESR);
1265 writel_relaxed(mask, pio + PIO_REHLSR);
1266 break;
1267 case IRQ_TYPE_EDGE_FALLING:
1268 irq_set_handler(d->irq, handle_simple_irq);
1269 writel_relaxed(mask, pio + PIO_ESR);
1270 writel_relaxed(mask, pio + PIO_FELLSR);
1271 break;
1272 case IRQ_TYPE_LEVEL_LOW:
1273 irq_set_handler(d->irq, handle_level_irq);
1274 writel_relaxed(mask, pio + PIO_LSR);
1275 writel_relaxed(mask, pio + PIO_FELLSR);
1276 break;
1277 case IRQ_TYPE_LEVEL_HIGH:
1278 irq_set_handler(d->irq, handle_level_irq);
1279 writel_relaxed(mask, pio + PIO_LSR);
1280 writel_relaxed(mask, pio + PIO_REHLSR);
1281 break;
1282 case IRQ_TYPE_EDGE_BOTH:
1283 /*
1284 * disable additional interrupt modes:
1285 * fall back to default behavior
1286 */
1287 irq_set_handler(d->irq, handle_simple_irq);
1288 writel_relaxed(mask, pio + PIO_AIMDR);
1289 return 0;
1290 case IRQ_TYPE_NONE:
1291 default:
1292 pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq));
1293 return -EINVAL;
1294 }
1295
1296 /* enable additional interrupt modes */
1297 writel_relaxed(mask, pio + PIO_AIMER);
1298
1299 return 0;
1300 }
1301
1302 #ifdef CONFIG_PM
1303
1304 static u32 wakeups[MAX_GPIO_BANKS];
1305 static u32 backups[MAX_GPIO_BANKS];
1306
1307 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1308 {
1309 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1310 unsigned bank = at91_gpio->pioc_idx;
1311 unsigned mask = 1 << d->hwirq;
1312
1313 if (unlikely(bank >= MAX_GPIO_BANKS))
1314 return -EINVAL;
1315
1316 if (state)
1317 wakeups[bank] |= mask;
1318 else
1319 wakeups[bank] &= ~mask;
1320
1321 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1322
1323 return 0;
1324 }
1325
1326 void at91_pinctrl_gpio_suspend(void)
1327 {
1328 int i;
1329
1330 for (i = 0; i < gpio_banks; i++) {
1331 void __iomem *pio;
1332
1333 if (!gpio_chips[i])
1334 continue;
1335
1336 pio = gpio_chips[i]->regbase;
1337
1338 backups[i] = __raw_readl(pio + PIO_IMR);
1339 __raw_writel(backups[i], pio + PIO_IDR);
1340 __raw_writel(wakeups[i], pio + PIO_IER);
1341
1342 if (!wakeups[i]) {
1343 clk_unprepare(gpio_chips[i]->clock);
1344 clk_disable(gpio_chips[i]->clock);
1345 } else {
1346 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
1347 'A'+i, wakeups[i]);
1348 }
1349 }
1350 }
1351
1352 void at91_pinctrl_gpio_resume(void)
1353 {
1354 int i;
1355
1356 for (i = 0; i < gpio_banks; i++) {
1357 void __iomem *pio;
1358
1359 if (!gpio_chips[i])
1360 continue;
1361
1362 pio = gpio_chips[i]->regbase;
1363
1364 if (!wakeups[i]) {
1365 if (clk_prepare(gpio_chips[i]->clock) == 0)
1366 clk_enable(gpio_chips[i]->clock);
1367 }
1368
1369 __raw_writel(wakeups[i], pio + PIO_IDR);
1370 __raw_writel(backups[i], pio + PIO_IER);
1371 }
1372 }
1373
1374 #else
1375 #define gpio_irq_set_wake NULL
1376 #endif /* CONFIG_PM */
1377
1378 static struct irq_chip gpio_irqchip = {
1379 .name = "GPIO",
1380 .irq_disable = gpio_irq_mask,
1381 .irq_mask = gpio_irq_mask,
1382 .irq_unmask = gpio_irq_unmask,
1383 /* .irq_set_type is set dynamically */
1384 .irq_set_wake = gpio_irq_set_wake,
1385 };
1386
1387 static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
1388 {
1389 struct irq_chip *chip = irq_desc_get_chip(desc);
1390 struct irq_data *idata = irq_desc_get_irq_data(desc);
1391 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata);
1392 void __iomem *pio = at91_gpio->regbase;
1393 unsigned long isr;
1394 int n;
1395
1396 chained_irq_enter(chip, desc);
1397 for (;;) {
1398 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
1399 * When there none are pending, we're finished unless we need
1400 * to process multiple banks (like ID_PIOCDE on sam9263).
1401 */
1402 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1403 if (!isr) {
1404 if (!at91_gpio->next)
1405 break;
1406 at91_gpio = at91_gpio->next;
1407 pio = at91_gpio->regbase;
1408 continue;
1409 }
1410
1411 for_each_set_bit(n, &isr, BITS_PER_LONG) {
1412 generic_handle_irq(irq_find_mapping(at91_gpio->domain, n));
1413 }
1414 }
1415 chained_irq_exit(chip, desc);
1416 /* now it may re-trigger */
1417 }
1418
1419 /*
1420 * This lock class tells lockdep that GPIO irqs are in a different
1421 * category than their parents, so it won't report false recursion.
1422 */
1423 static struct lock_class_key gpio_lock_class;
1424
1425 static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
1426 irq_hw_number_t hw)
1427 {
1428 struct at91_gpio_chip *at91_gpio = h->host_data;
1429 void __iomem *pio = at91_gpio->regbase;
1430 u32 mask = 1 << hw;
1431
1432 irq_set_lockdep_class(virq, &gpio_lock_class);
1433
1434 /*
1435 * Can use the "simple" and not "edge" handler since it's
1436 * shorter, and the AIC handles interrupts sanely.
1437 */
1438 irq_set_chip(virq, &gpio_irqchip);
1439 if ((at91_gpio->ops == &at91sam9x5_ops) &&
1440 (readl_relaxed(pio + PIO_AIMMR) & mask) &&
1441 (readl_relaxed(pio + PIO_ELSR) & mask))
1442 irq_set_handler(virq, handle_level_irq);
1443 else
1444 irq_set_handler(virq, handle_simple_irq);
1445 set_irq_flags(virq, IRQF_VALID);
1446 irq_set_chip_data(virq, at91_gpio);
1447
1448 return 0;
1449 }
1450
1451 static int at91_gpio_irq_domain_xlate(struct irq_domain *d,
1452 struct device_node *ctrlr,
1453 const u32 *intspec, unsigned int intsize,
1454 irq_hw_number_t *out_hwirq,
1455 unsigned int *out_type)
1456 {
1457 struct at91_gpio_chip *at91_gpio = d->host_data;
1458 int ret;
1459 int pin = at91_gpio->chip.base + intspec[0];
1460
1461 if (WARN_ON(intsize < 2))
1462 return -EINVAL;
1463 *out_hwirq = intspec[0];
1464 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
1465
1466 ret = gpio_request(pin, ctrlr->full_name);
1467 if (ret)
1468 return ret;
1469
1470 ret = gpio_direction_input(pin);
1471 if (ret)
1472 return ret;
1473
1474 return 0;
1475 }
1476
1477 static struct irq_domain_ops at91_gpio_ops = {
1478 .map = at91_gpio_irq_map,
1479 .xlate = at91_gpio_irq_domain_xlate,
1480 };
1481
1482 static int at91_gpio_of_irq_setup(struct device_node *node,
1483 struct at91_gpio_chip *at91_gpio)
1484 {
1485 struct at91_gpio_chip *prev = NULL;
1486 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
1487
1488 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1489
1490 /* Setup proper .irq_set_type function */
1491 gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type;
1492
1493 /* Disable irqs of this PIO controller */
1494 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1495
1496 /* Setup irq domain */
1497 at91_gpio->domain = irq_domain_add_linear(node, at91_gpio->chip.ngpio,
1498 &at91_gpio_ops, at91_gpio);
1499 if (!at91_gpio->domain)
1500 panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n",
1501 at91_gpio->pioc_idx);
1502
1503 /* Setup chained handler */
1504 if (at91_gpio->pioc_idx)
1505 prev = gpio_chips[at91_gpio->pioc_idx - 1];
1506
1507 /* The top level handler handles one bank of GPIOs, except
1508 * on some SoC it can handles up to three...
1509 * We only set up the handler for the first of the list.
1510 */
1511 if (prev && prev->next == at91_gpio)
1512 return 0;
1513
1514 irq_set_chip_data(at91_gpio->pioc_virq, at91_gpio);
1515 irq_set_chained_handler(at91_gpio->pioc_virq, gpio_irq_handler);
1516
1517 return 0;
1518 }
1519
1520 /* This structure is replicated for each GPIO block allocated at probe time */
1521 static struct gpio_chip at91_gpio_template = {
1522 .request = at91_gpio_request,
1523 .free = at91_gpio_free,
1524 .direction_input = at91_gpio_direction_input,
1525 .get = at91_gpio_get,
1526 .direction_output = at91_gpio_direction_output,
1527 .set = at91_gpio_set,
1528 .to_irq = at91_gpio_to_irq,
1529 .dbg_show = at91_gpio_dbg_show,
1530 .can_sleep = 0,
1531 .ngpio = MAX_NB_GPIO_PER_BANK,
1532 };
1533
1534 static void at91_gpio_probe_fixup(void)
1535 {
1536 unsigned i;
1537 struct at91_gpio_chip *at91_gpio, *last = NULL;
1538
1539 for (i = 0; i < gpio_banks; i++) {
1540 at91_gpio = gpio_chips[i];
1541
1542 /*
1543 * GPIO controller are grouped on some SoC:
1544 * PIOC, PIOD and PIOE can share the same IRQ line
1545 */
1546 if (last && last->pioc_virq == at91_gpio->pioc_virq)
1547 last->next = at91_gpio;
1548 last = at91_gpio;
1549 }
1550 }
1551
1552 static struct of_device_id at91_gpio_of_match[] = {
1553 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1554 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1555 { /* sentinel */ }
1556 };
1557
1558 static int at91_gpio_probe(struct platform_device *pdev)
1559 {
1560 struct device_node *np = pdev->dev.of_node;
1561 struct resource *res;
1562 struct at91_gpio_chip *at91_chip = NULL;
1563 struct gpio_chip *chip;
1564 struct pinctrl_gpio_range *range;
1565 int ret = 0;
1566 int irq, i;
1567 int alias_idx = of_alias_get_id(np, "gpio");
1568 uint32_t ngpio;
1569 char **names;
1570
1571 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1572 if (gpio_chips[alias_idx]) {
1573 ret = -EBUSY;
1574 goto err;
1575 }
1576
1577 irq = platform_get_irq(pdev, 0);
1578 if (irq < 0) {
1579 ret = irq;
1580 goto err;
1581 }
1582
1583 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1584 if (!at91_chip) {
1585 ret = -ENOMEM;
1586 goto err;
1587 }
1588
1589 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1590 at91_chip->regbase = devm_ioremap_resource(&pdev->dev, res);
1591 if (IS_ERR(at91_chip->regbase)) {
1592 ret = PTR_ERR(at91_chip->regbase);
1593 goto err;
1594 }
1595
1596 at91_chip->ops = (struct at91_pinctrl_mux_ops *)
1597 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1598 at91_chip->pioc_virq = irq;
1599 at91_chip->pioc_idx = alias_idx;
1600
1601 at91_chip->clock = clk_get(&pdev->dev, NULL);
1602 if (IS_ERR(at91_chip->clock)) {
1603 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1604 goto err;
1605 }
1606
1607 if (clk_prepare(at91_chip->clock))
1608 goto clk_prep_err;
1609
1610 /* enable PIO controller's clock */
1611 if (clk_enable(at91_chip->clock)) {
1612 dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
1613 goto clk_err;
1614 }
1615
1616 at91_chip->chip = at91_gpio_template;
1617
1618 chip = &at91_chip->chip;
1619 chip->of_node = np;
1620 chip->label = dev_name(&pdev->dev);
1621 chip->dev = &pdev->dev;
1622 chip->owner = THIS_MODULE;
1623 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1624
1625 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1626 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1627 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1628 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1629 else
1630 chip->ngpio = ngpio;
1631 }
1632
1633 names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
1634 GFP_KERNEL);
1635
1636 if (!names) {
1637 ret = -ENOMEM;
1638 goto clk_err;
1639 }
1640
1641 for (i = 0; i < chip->ngpio; i++)
1642 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1643
1644 chip->names = (const char *const *)names;
1645
1646 range = &at91_chip->range;
1647 range->name = chip->label;
1648 range->id = alias_idx;
1649 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1650
1651 range->npins = chip->ngpio;
1652 range->gc = chip;
1653
1654 ret = gpiochip_add(chip);
1655 if (ret)
1656 goto clk_err;
1657
1658 gpio_chips[alias_idx] = at91_chip;
1659 gpio_banks = max(gpio_banks, alias_idx + 1);
1660
1661 at91_gpio_probe_fixup();
1662
1663 at91_gpio_of_irq_setup(np, at91_chip);
1664
1665 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1666
1667 return 0;
1668
1669 clk_err:
1670 clk_unprepare(at91_chip->clock);
1671 clk_prep_err:
1672 clk_put(at91_chip->clock);
1673 err:
1674 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1675
1676 return ret;
1677 }
1678
1679 static struct platform_driver at91_gpio_driver = {
1680 .driver = {
1681 .name = "gpio-at91",
1682 .owner = THIS_MODULE,
1683 .of_match_table = at91_gpio_of_match,
1684 },
1685 .probe = at91_gpio_probe,
1686 };
1687
1688 static struct platform_driver at91_pinctrl_driver = {
1689 .driver = {
1690 .name = "pinctrl-at91",
1691 .owner = THIS_MODULE,
1692 .of_match_table = at91_pinctrl_of_match,
1693 },
1694 .probe = at91_pinctrl_probe,
1695 .remove = at91_pinctrl_remove,
1696 };
1697
1698 static int __init at91_pinctrl_init(void)
1699 {
1700 int ret;
1701
1702 ret = platform_driver_register(&at91_gpio_driver);
1703 if (ret)
1704 return ret;
1705 return platform_driver_register(&at91_pinctrl_driver);
1706 }
1707 arch_initcall(at91_pinctrl_init);
1708
1709 static void __exit at91_pinctrl_exit(void)
1710 {
1711 platform_driver_unregister(&at91_pinctrl_driver);
1712 }
1713
1714 module_exit(at91_pinctrl_exit);
1715 MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>");
1716 MODULE_DESCRIPTION("Atmel AT91 pinctrl driver");
1717 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support