Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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

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