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pinctrl/at91: convert driver to use gpiolib irqchip
[mirror_ubuntu-artful-kernel.git] / drivers / pinctrl / pinctrl-at91.c
CommitLineData
6732ae5c
JCPV		 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>
6732ae5c
JCPV		 19#include <linux/io.h>
20#include <linux/gpio.h>
6732ae5c
JCPV		 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
6732ae5c
JCPV		 28#include <mach/hardware.h>
29#include <mach/at91_pio.h>
30
31#include "core.h"
32
94daf85e 33#define MAX_GPIO_BANKS 5
6732ae5c
JCPV		 34#define MAX_NB_GPIO_PER_BANK 32
35
36struct at91_pinctrl_mux_ops;
37
38struct at91_gpio_chip {
39 struct gpio_chip chip;
40 struct pinctrl_gpio_range range;
41 struct at91_gpio_chip *next; /* Bank sharing same clock */
42 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
43 int pioc_virq; /* PIO bank Linux virtual interrupt */
44 int pioc_idx; /* PIO bank index */
45 void __iomem *regbase; /* PIO bank virtual address */
46 struct clk *clock; /* associated clock */
6732ae5c
JCPV		 47 struct at91_pinctrl_mux_ops *ops; /* ops */
48};
49
50#define to_at91_gpio_chip(c) container_of(c, struct at91_gpio_chip, chip)
51
52static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
53
54static int gpio_banks;
55
525fae21 56#define PULL_UP (1 << 0)
6732ae5c 57#define MULTI_DRIVE (1 << 1)
7ebd7a3a
JCPV		 58#define DEGLITCH (1 << 2)
59#define PULL_DOWN (1 << 3)
60#define DIS_SCHMIT (1 << 4)
61#define DEBOUNCE (1 << 16)
62#define DEBOUNCE_VAL_SHIFT 17
63#define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
6732ae5c
JCPV		 64
65/**
66 * struct at91_pmx_func - describes AT91 pinmux functions
67 * @name: the name of this specific function
68 * @groups: corresponding pin groups
69 * @ngroups: the number of groups
70 */
71struct at91_pmx_func {
72 const char *name;
73 const char **groups;
74 unsigned ngroups;
75};
76
77enum at91_mux {
78 AT91_MUX_GPIO = 0,
79 AT91_MUX_PERIPH_A = 1,
80 AT91_MUX_PERIPH_B = 2,
81 AT91_MUX_PERIPH_C = 3,
82 AT91_MUX_PERIPH_D = 4,
83};
84
85/**
86 * struct at91_pmx_pin - describes an At91 pin mux
87 * @bank: the bank of the pin
88 * @pin: the pin number in the @bank
89 * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
90 * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
91 */
92struct at91_pmx_pin {
93 uint32_t bank;
94 uint32_t pin;
95 enum at91_mux mux;
96 unsigned long conf;
97};
98
99/**
100 * struct at91_pin_group - describes an At91 pin group
101 * @name: the name of this specific pin group
102 * @pins_conf: the mux mode for each pin in this group. The size of this
103 * array is the same as pins.
104 * @pins: an array of discrete physical pins used in this group, taken
105 * from the driver-local pin enumeration space
106 * @npins: the number of pins in this group array, i.e. the number of
107 * elements in .pins so we can iterate over that array
108 */
109struct at91_pin_group {
110 const char *name;
111 struct at91_pmx_pin *pins_conf;
112 unsigned int *pins;
113 unsigned npins;
114};
115
116/**
c2eb9e7f 117 * struct at91_pinctrl_mux_ops - describes an AT91 mux ops group
6732ae5c
JCPV		 118 * on new IP with support for periph C and D the way to mux in
119 * periph A and B has changed
120 * So provide the right call back
121 * if not present means the IP does not support it
122 * @get_periph: return the periph mode configured
123 * @mux_A_periph: mux as periph A
124 * @mux_B_periph: mux as periph B
125 * @mux_C_periph: mux as periph C
126 * @mux_D_periph: mux as periph D
7ebd7a3a
JCPV		 127 * @get_deglitch: get deglitch status
128 * @set_deglitch: enable/disable deglitch
129 * @get_debounce: get debounce status
130 * @set_debounce: enable/disable debounce
131 * @get_pulldown: get pulldown status
132 * @set_pulldown: enable/disable pulldown
133 * @get_schmitt_trig: get schmitt trigger status
134 * @disable_schmitt_trig: disable schmitt trigger
6732ae5c
JCPV		 135 * @irq_type: return irq type
136 */
137struct at91_pinctrl_mux_ops {
138 enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
139 void (*mux_A_periph)(void __iomem *pio, unsigned mask);
140 void (*mux_B_periph)(void __iomem *pio, unsigned mask);
141 void (*mux_C_periph)(void __iomem *pio, unsigned mask);
142 void (*mux_D_periph)(void __iomem *pio, unsigned mask);
7ebd7a3a 143 bool (*get_deglitch)(void __iomem *pio, unsigned pin);
77966ad7 144 void (*set_deglitch)(void __iomem *pio, unsigned mask, bool is_on);
7ebd7a3a 145 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
77966ad7 146 void (*set_debounce)(void __iomem *pio, unsigned mask, bool is_on, u32 div);
7ebd7a3a 147 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
77966ad7 148 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool is_on);
7ebd7a3a
JCPV		 149 bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
150 void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
6732ae5c
JCPV		 151 /* irq */
152 int (*irq_type)(struct irq_data *d, unsigned type);
153};
154
155static int gpio_irq_type(struct irq_data *d, unsigned type);
156static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
157
158struct at91_pinctrl {
159 struct device *dev;
160 struct pinctrl_dev *pctl;
161
162 int nbanks;
163
164 uint32_t *mux_mask;
165 int nmux;
166
167 struct at91_pmx_func *functions;
168 int nfunctions;
169
170 struct at91_pin_group *groups;
171 int ngroups;
172
173 struct at91_pinctrl_mux_ops *ops;
174};
175
176static const inline struct at91_pin_group *at91_pinctrl_find_group_by_name(
177 const struct at91_pinctrl *info,
178 const char *name)
179{
180 const struct at91_pin_group *grp = NULL;
181 int i;
182
183 for (i = 0; i < info->ngroups; i++) {
184 if (strcmp(info->groups[i].name, name))
185 continue;
186
187 grp = &info->groups[i];
188 dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
189 break;
190 }
191
192 return grp;
193}
194
195static int at91_get_groups_count(struct pinctrl_dev *pctldev)
196{
197 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
198
199 return info->ngroups;
200}
201
202static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
203 unsigned selector)
204{
205 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
206
207 return info->groups[selector].name;
208}
209
210static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
211 const unsigned **pins,
212 unsigned *npins)
213{
214 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
215
216 if (selector >= info->ngroups)
217 return -EINVAL;
218
219 *pins = info->groups[selector].pins;
220 *npins = info->groups[selector].npins;
221
222 return 0;
223}
224
225static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
226 unsigned offset)
227{
228 seq_printf(s, "%s", dev_name(pctldev->dev));
229}
230
231static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
232 struct device_node *np,
233 struct pinctrl_map **map, unsigned *num_maps)
234{
235 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
236 const struct at91_pin_group *grp;
237 struct pinctrl_map *new_map;
238 struct device_node *parent;
239 int map_num = 1;
240 int i;
6732ae5c
JCPV		 241
242 /*
61e310a1 243 * first find the group of this node and check if we need to create
6732ae5c
JCPV		 244 * config maps for pins
245 */
246 grp = at91_pinctrl_find_group_by_name(info, np->name);
247 if (!grp) {
248 dev_err(info->dev, "unable to find group for node %s\n",
249 np->name);
250 return -EINVAL;
251 }
252
253 map_num += grp->npins;
254 new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, GFP_KERNEL);
255 if (!new_map)
256 return -ENOMEM;
257
258 *map = new_map;
259 *num_maps = map_num;
260
261 /* create mux map */
262 parent = of_get_parent(np);
263 if (!parent) {
c62b2b34 264 devm_kfree(pctldev->dev, new_map);
6732ae5c
JCPV		 265 return -EINVAL;
266 }
267 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
268 new_map[0].data.mux.function = parent->name;
269 new_map[0].data.mux.group = np->name;
270 of_node_put(parent);
271
272 /* create config map */
273 new_map++;
274 for (i = 0; i < grp->npins; i++) {
6732ae5c
JCPV		 275 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
276 new_map[i].data.configs.group_or_pin =
277 pin_get_name(pctldev, grp->pins[i]);
278 new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
279 new_map[i].data.configs.num_configs = 1;
280 }
281
282 dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
283 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
284
285 return 0;
286}
287
288static void at91_dt_free_map(struct pinctrl_dev *pctldev,
289 struct pinctrl_map *map, unsigned num_maps)
290{
291}
292
022ab148 293static const struct pinctrl_ops at91_pctrl_ops = {
6732ae5c
JCPV		 294 .get_groups_count = at91_get_groups_count,
295 .get_group_name = at91_get_group_name,
296 .get_group_pins = at91_get_group_pins,
297 .pin_dbg_show = at91_pin_dbg_show,
298 .dt_node_to_map = at91_dt_node_to_map,
299 .dt_free_map = at91_dt_free_map,
300};
301
3c93600d 302static void __iomem *pin_to_controller(struct at91_pinctrl *info,
6732ae5c
JCPV		 303 unsigned int bank)
304{
305 return gpio_chips[bank]->regbase;
306}
307
308static inline int pin_to_bank(unsigned pin)
309{
310 return pin /= MAX_NB_GPIO_PER_BANK;
311}
312
313static unsigned pin_to_mask(unsigned int pin)
314{
315 return 1 << pin;
316}
317
318static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
319{
320 writel_relaxed(mask, pio + PIO_IDR);
321}
322
323static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
324{
05d3534a 325 return !((readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1);
6732ae5c
JCPV		 326}
327
328static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
329{
330 writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
331}
332
333static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
334{
335 return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
336}
337
338static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
339{
340 writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
341}
342
343static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
344{
345 writel_relaxed(mask, pio + PIO_ASR);
346}
347
348static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
349{
350 writel_relaxed(mask, pio + PIO_BSR);
351}
352
353static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
354{
355
356 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
357 pio + PIO_ABCDSR1);
358 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
359 pio + PIO_ABCDSR2);
360}
361
362static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
363{
364 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
365 pio + PIO_ABCDSR1);
366 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
367 pio + PIO_ABCDSR2);
368}
369
370static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
371{
372 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
373 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
374}
375
376static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
377{
378 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
379 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
380}
381
382static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
383{
384 unsigned select;
385
386 if (readl_relaxed(pio + PIO_PSR) & mask)
387 return AT91_MUX_GPIO;
388
389 select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
390 select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
391
392 return select + 1;
393}
394
395static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
396{
397 unsigned select;
398
399 if (readl_relaxed(pio + PIO_PSR) & mask)
400 return AT91_MUX_GPIO;
401
402 select = readl_relaxed(pio + PIO_ABSR) & mask;
403
404 return select + 1;
405}
406
7ebd7a3a
JCPV		 407static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
408{
409 return (__raw_readl(pio + PIO_IFSR) >> pin) & 0x1;
410}
411
412static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
413{
414 __raw_writel(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
415}
416
c8dba02e
BB		 417static bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
418{
419 if ((__raw_readl(pio + PIO_IFSR) >> pin) & 0x1)
420 return !((__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1);
421
422 return false;
423}
424
7ebd7a3a
JCPV		 425static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
426{
427 if (is_on)
428 __raw_writel(mask, pio + PIO_IFSCDR);
429 at91_mux_set_deglitch(pio, mask, is_on);
430}
431
432static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
433{
434 *div = __raw_readl(pio + PIO_SCDR);
435
c8dba02e
BB		 436 return ((__raw_readl(pio + PIO_IFSR) >> pin) & 0x1) &&
437 ((__raw_readl(pio + PIO_IFSCSR) >> pin) & 0x1);
7ebd7a3a
JCPV		 438}
439
440static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
441 bool is_on, u32 div)
442{
443 if (is_on) {
444 __raw_writel(mask, pio + PIO_IFSCER);
445 __raw_writel(div & PIO_SCDR_DIV, pio + PIO_SCDR);
446 __raw_writel(mask, pio + PIO_IFER);
c8dba02e
BB		 447 } else
448 __raw_writel(mask, pio + PIO_IFSCDR);
7ebd7a3a
JCPV		 449}
450
451static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
452{
05d3534a 453 return !((__raw_readl(pio + PIO_PPDSR) >> pin) & 0x1);
7ebd7a3a
JCPV		 454}
455
456static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
457{
458 __raw_writel(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
459}
460
461static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
462{
463 __raw_writel(__raw_readl(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
464}
465
466static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
467{
468 return (__raw_readl(pio + PIO_SCHMITT) >> pin) & 0x1;
469}
470
6732ae5c
JCPV		 471static struct at91_pinctrl_mux_ops at91rm9200_ops = {
472 .get_periph = at91_mux_get_periph,
473 .mux_A_periph = at91_mux_set_A_periph,
474 .mux_B_periph = at91_mux_set_B_periph,
7ebd7a3a
JCPV		 475 .get_deglitch = at91_mux_get_deglitch,
476 .set_deglitch = at91_mux_set_deglitch,
6732ae5c
JCPV		 477 .irq_type = gpio_irq_type,
478};
479
480static struct at91_pinctrl_mux_ops at91sam9x5_ops = {
481 .get_periph = at91_mux_pio3_get_periph,
482 .mux_A_periph = at91_mux_pio3_set_A_periph,
483 .mux_B_periph = at91_mux_pio3_set_B_periph,
484 .mux_C_periph = at91_mux_pio3_set_C_periph,
485 .mux_D_periph = at91_mux_pio3_set_D_periph,
c8dba02e 486 .get_deglitch = at91_mux_pio3_get_deglitch,
7ebd7a3a
JCPV		 487 .set_deglitch = at91_mux_pio3_set_deglitch,
488 .get_debounce = at91_mux_pio3_get_debounce,
489 .set_debounce = at91_mux_pio3_set_debounce,
490 .get_pulldown = at91_mux_pio3_get_pulldown,
491 .set_pulldown = at91_mux_pio3_set_pulldown,
492 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
493 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
6732ae5c
JCPV		 494 .irq_type = alt_gpio_irq_type,
495};
496
497static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
498{
499 if (pin->mux) {
500 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lu\n",
501 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
502 } else {
503 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lu\n",
504 pin->bank + 'A', pin->pin, pin->conf);
505 }
506}
507
3c93600d 508static int pin_check_config(struct at91_pinctrl *info, const char *name,
6732ae5c
JCPV		 509 int index, const struct at91_pmx_pin *pin)
510{
511 int mux;
512
513 /* check if it's a valid config */
514 if (pin->bank >= info->nbanks) {
515 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
516 name, index, pin->bank, info->nbanks);
517 return -EINVAL;
518 }
519
520 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
521 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
522 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
523 return -EINVAL;
524 }
525
526 if (!pin->mux)
527 return 0;
528
529 mux = pin->mux - 1;
530
531 if (mux >= info->nmux) {
532 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
533 name, index, mux, info->nmux);
534 return -EINVAL;
535 }
536
537 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
538 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
539 name, index, mux, pin->bank + 'A', pin->pin);
540 return -EINVAL;
541 }
542
543 return 0;
544}
545
546static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
547{
548 writel_relaxed(mask, pio + PIO_PDR);
549}
550
551static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
552{
553 writel_relaxed(mask, pio + PIO_PER);
554 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
555}
556
557static int at91_pmx_enable(struct pinctrl_dev *pctldev, unsigned selector,
558 unsigned group)
559{
560 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
561 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
562 const struct at91_pmx_pin *pin;
563 uint32_t npins = info->groups[group].npins;
564 int i, ret;
565 unsigned mask;
566 void __iomem *pio;
567
568 dev_dbg(info->dev, "enable function %s group %s\n",
569 info->functions[selector].name, info->groups[group].name);
570
571 /* first check that all the pins of the group are valid with a valid
61e310a1 572 * parameter */
6732ae5c
JCPV		 573 for (i = 0; i < npins; i++) {
574 pin = &pins_conf[i];
575 ret = pin_check_config(info, info->groups[group].name, i, pin);
576 if (ret)
577 return ret;
578 }
579
580 for (i = 0; i < npins; i++) {
581 pin = &pins_conf[i];
582 at91_pin_dbg(info->dev, pin);
583 pio = pin_to_controller(info, pin->bank);
584 mask = pin_to_mask(pin->pin);
585 at91_mux_disable_interrupt(pio, mask);
3c93600d 586 switch (pin->mux) {
6732ae5c
JCPV		 587 case AT91_MUX_GPIO:
588 at91_mux_gpio_enable(pio, mask, 1);
589 break;
590 case AT91_MUX_PERIPH_A:
591 info->ops->mux_A_periph(pio, mask);
592 break;
593 case AT91_MUX_PERIPH_B:
594 info->ops->mux_B_periph(pio, mask);
595 break;
596 case AT91_MUX_PERIPH_C:
597 if (!info->ops->mux_C_periph)
598 return -EINVAL;
599 info->ops->mux_C_periph(pio, mask);
600 break;
601 case AT91_MUX_PERIPH_D:
602 if (!info->ops->mux_D_periph)
603 return -EINVAL;
604 info->ops->mux_D_periph(pio, mask);
605 break;
606 }
607 if (pin->mux)
608 at91_mux_gpio_disable(pio, mask);
609 }
610
611 return 0;
612}
613
614static void at91_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
615 unsigned group)
616{
617 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
618 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
619 const struct at91_pmx_pin *pin;
620 uint32_t npins = info->groups[group].npins;
621 int i;
622 unsigned mask;
623 void __iomem *pio;
624
625 for (i = 0; i < npins; i++) {
626 pin = &pins_conf[i];
627 at91_pin_dbg(info->dev, pin);
628 pio = pin_to_controller(info, pin->bank);
629 mask = pin_to_mask(pin->pin);
630 at91_mux_gpio_enable(pio, mask, 1);
631 }
632}
633
634static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
635{
636 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
637
638 return info->nfunctions;
639}
640
641static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
642 unsigned selector)
643{
644 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
645
646 return info->functions[selector].name;
647}
648
649static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
650 const char * const **groups,
651 unsigned * const num_groups)
652{
653 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
654
655 *groups = info->functions[selector].groups;
656 *num_groups = info->functions[selector].ngroups;
657
658 return 0;
659}
660
f6f94f66
AL		 661static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
662 struct pinctrl_gpio_range *range,
663 unsigned offset)
6732ae5c
JCPV		 664{
665 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
666 struct at91_gpio_chip *at91_chip;
667 struct gpio_chip *chip;
668 unsigned mask;
669
670 if (!range) {
671 dev_err(npct->dev, "invalid range\n");
672 return -EINVAL;
673 }
674 if (!range->gc) {
675 dev_err(npct->dev, "missing GPIO chip in range\n");
676 return -EINVAL;
677 }
678 chip = range->gc;
679 at91_chip = container_of(chip, struct at91_gpio_chip, chip);
680
681 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
682
683 mask = 1 << (offset - chip->base);
684
685 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
686 offset, 'A' + range->id, offset - chip->base, mask);
687
688 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
689
690 return 0;
691}
692
f6f94f66
AL		 693static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
694 struct pinctrl_gpio_range *range,
695 unsigned offset)
6732ae5c
JCPV		 696{
697 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
698
699 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
700 /* Set the pin to some default state, GPIO is usually default */
701}
702
022ab148 703static const struct pinmux_ops at91_pmx_ops = {
6732ae5c
JCPV		 704 .get_functions_count = at91_pmx_get_funcs_count,
705 .get_function_name = at91_pmx_get_func_name,
706 .get_function_groups = at91_pmx_get_groups,
707 .enable = at91_pmx_enable,
708 .disable = at91_pmx_disable,
709 .gpio_request_enable = at91_gpio_request_enable,
710 .gpio_disable_free = at91_gpio_disable_free,
711};
712
713static int at91_pinconf_get(struct pinctrl_dev *pctldev,
714 unsigned pin_id, unsigned long *config)
715{
716 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
717 void __iomem *pio;
718 unsigned pin;
7ebd7a3a 719 int div;
6732ae5c 720
1292e693
AB		 721 *config = 0;
722 dev_dbg(info->dev, "%s:%d, pin_id=%d", __func__, __LINE__, pin_id);
6732ae5c
JCPV		 723 pio = pin_to_controller(info, pin_to_bank(pin_id));
724 pin = pin_id % MAX_NB_GPIO_PER_BANK;
725
726 if (at91_mux_get_multidrive(pio, pin))
727 *config |= MULTI_DRIVE;
728
729 if (at91_mux_get_pullup(pio, pin))
730 *config |= PULL_UP;
731
7ebd7a3a
JCPV		 732 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
733 *config |= DEGLITCH;
734 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
735 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
736 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
737 *config |= PULL_DOWN;
738 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
739 *config |= DIS_SCHMIT;
740
6732ae5c
JCPV		 741 return 0;
742}
743
744static int at91_pinconf_set(struct pinctrl_dev *pctldev,
03b054e9
SY		 745 unsigned pin_id, unsigned long *configs,
746 unsigned num_configs)
6732ae5c
JCPV		 747{
748 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
749 unsigned mask;
750 void __iomem *pio;
03b054e9
SY		 751 int i;
752 unsigned long config;
753
754 for (i = 0; i < num_configs; i++) {
755 config = configs[i];
756
757 dev_dbg(info->dev,
758 "%s:%d, pin_id=%d, config=0x%lx",
759 __func__, __LINE__, pin_id, config);
760 pio = pin_to_controller(info, pin_to_bank(pin_id));
761 mask = pin_to_mask(pin_id % MAX_NB_GPIO_PER_BANK);
762
763 if (config & PULL_UP && config & PULL_DOWN)
764 return -EINVAL;
765
766 at91_mux_set_pullup(pio, mask, config & PULL_UP);
767 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
768 if (info->ops->set_deglitch)
769 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
770 if (info->ops->set_debounce)
771 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
7ebd7a3a 772 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
03b054e9
SY		 773 if (info->ops->set_pulldown)
774 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
775 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
776 info->ops->disable_schmitt_trig(pio, mask);
777
778 } /* for each config */
7ebd7a3a 779
6732ae5c
JCPV		 780 return 0;
781}
782
4d9b8a8e
AB		 783#define DBG_SHOW_FLAG(flag) do { \
784 if (config & flag) { \
785 if (num_conf) \
786 seq_puts(s, "|"); \
787 seq_puts(s, #flag); \
788 num_conf++; \
789 } \
790} while (0)
791
6732ae5c
JCPV		 792static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
793 struct seq_file *s, unsigned pin_id)
794{
4d9b8a8e
AB		 795 unsigned long config;
796 int ret, val, num_conf = 0;
797
798 ret = at91_pinconf_get(pctldev, pin_id, &config);
799
800 DBG_SHOW_FLAG(MULTI_DRIVE);
801 DBG_SHOW_FLAG(PULL_UP);
802 DBG_SHOW_FLAG(PULL_DOWN);
803 DBG_SHOW_FLAG(DIS_SCHMIT);
804 DBG_SHOW_FLAG(DEGLITCH);
805 DBG_SHOW_FLAG(DEBOUNCE);
806 if (config & DEBOUNCE) {
807 val = config >> DEBOUNCE_VAL_SHIFT;
808 seq_printf(s, "(%d)", val);
809 }
6732ae5c 810
4d9b8a8e 811 return;
6732ae5c
JCPV		 812}
813
814static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
815 struct seq_file *s, unsigned group)
816{
817}
818
022ab148 819static const struct pinconf_ops at91_pinconf_ops = {
6732ae5c
JCPV		 820 .pin_config_get = at91_pinconf_get,
821 .pin_config_set = at91_pinconf_set,
822 .pin_config_dbg_show = at91_pinconf_dbg_show,
823 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
824};
825
826static struct pinctrl_desc at91_pinctrl_desc = {
827 .pctlops = &at91_pctrl_ops,
828 .pmxops = &at91_pmx_ops,
829 .confops = &at91_pinconf_ops,
830 .owner = THIS_MODULE,
831};
832
833static const char *gpio_compat = "atmel,at91rm9200-gpio";
834
150632b0
GKH		 835static void at91_pinctrl_child_count(struct at91_pinctrl *info,
836 struct device_node *np)
6732ae5c
JCPV		 837{
838 struct device_node *child;
839
840 for_each_child_of_node(np, child) {
841 if (of_device_is_compatible(child, gpio_compat)) {
842 info->nbanks++;
843 } else {
844 info->nfunctions++;
845 info->ngroups += of_get_child_count(child);
846 }
847 }
848}
849
150632b0
GKH		 850static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
851 struct device_node *np)
6732ae5c
JCPV		 852{
853 int ret = 0;
854 int size;
1164d73a 855 const __be32 *list;
6732ae5c
JCPV		 856
857 list = of_get_property(np, "atmel,mux-mask", &size);
858 if (!list) {
859 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
860 return -EINVAL;
861 }
862
863 size /= sizeof(*list);
864 if (!size || size % info->nbanks) {
865 dev_err(info->dev, "wrong mux mask array should be by %d\n", info->nbanks);
866 return -EINVAL;
867 }
868 info->nmux = size / info->nbanks;
869
870 info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size, GFP_KERNEL);
871 if (!info->mux_mask) {
872 dev_err(info->dev, "could not alloc mux_mask\n");
873 return -ENOMEM;
874 }
875
876 ret = of_property_read_u32_array(np, "atmel,mux-mask",
877 info->mux_mask, size);
878 if (ret)
879 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
880 return ret;
881}
882
150632b0
GKH		 883static int at91_pinctrl_parse_groups(struct device_node *np,
884 struct at91_pin_group *grp,
885 struct at91_pinctrl *info, u32 index)
6732ae5c
JCPV		 886{
887 struct at91_pmx_pin *pin;
888 int size;
1164d73a 889 const __be32 *list;
6732ae5c
JCPV		 890 int i, j;
891
892 dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
893
894 /* Initialise group */
895 grp->name = np->name;
896
897 /*
898 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
899 * do sanity check and calculate pins number
900 */
901 list = of_get_property(np, "atmel,pins", &size);
902 /* we do not check return since it's safe node passed down */
903 size /= sizeof(*list);
904 if (!size || size % 4) {
905 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
906 return -EINVAL;
907 }
908
909 grp->npins = size / 4;
910 pin = grp->pins_conf = devm_kzalloc(info->dev, grp->npins * sizeof(struct at91_pmx_pin),
911 GFP_KERNEL);
912 grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
913 GFP_KERNEL);
914 if (!grp->pins_conf || !grp->pins)
915 return -ENOMEM;
916
917 for (i = 0, j = 0; i < size; i += 4, j++) {
918 pin->bank = be32_to_cpu(*list++);
919 pin->pin = be32_to_cpu(*list++);
920 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
921 pin->mux = be32_to_cpu(*list++);
922 pin->conf = be32_to_cpu(*list++);
923
924 at91_pin_dbg(info->dev, pin);
925 pin++;
926 }
927
928 return 0;
929}
930
150632b0
GKH		 931static int at91_pinctrl_parse_functions(struct device_node *np,
932 struct at91_pinctrl *info, u32 index)
6732ae5c
JCPV		 933{
934 struct device_node *child;
935 struct at91_pmx_func *func;
936 struct at91_pin_group *grp;
937 int ret;
938 static u32 grp_index;
939 u32 i = 0;
940
941 dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
942
943 func = &info->functions[index];
944
945 /* Initialise function */
946 func->name = np->name;
947 func->ngroups = of_get_child_count(np);
948 if (func->ngroups <= 0) {
949 dev_err(info->dev, "no groups defined\n");
950 return -EINVAL;
951 }
952 func->groups = devm_kzalloc(info->dev,
953 func->ngroups * sizeof(char *), GFP_KERNEL);
954 if (!func->groups)
955 return -ENOMEM;
956
957 for_each_child_of_node(np, child) {
958 func->groups[i] = child->name;
959 grp = &info->groups[grp_index++];
960 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
961 if (ret)
962 return ret;
963 }
964
965 return 0;
966}
967
150632b0 968static struct of_device_id at91_pinctrl_of_match[] = {
6732ae5c
JCPV		 969 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
970 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
971 { /* sentinel */ }
972};
973
150632b0
GKH		 974static int at91_pinctrl_probe_dt(struct platform_device *pdev,
975 struct at91_pinctrl *info)
6732ae5c
JCPV		 976{
977 int ret = 0;
978 int i, j;
979 uint32_t *tmp;
980 struct device_node *np = pdev->dev.of_node;
981 struct device_node *child;
982
983 if (!np)
984 return -ENODEV;
985
986 info->dev = &pdev->dev;
3c93600d 987 info->ops = (struct at91_pinctrl_mux_ops *)
6732ae5c
JCPV		 988 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
989 at91_pinctrl_child_count(info, np);
990
991 if (info->nbanks < 1) {
61e310a1 992 dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n");
6732ae5c
JCPV		 993 return -EINVAL;
994 }
995
996 ret = at91_pinctrl_mux_mask(info, np);
997 if (ret)
998 return ret;
999
1000 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
1001
1002 dev_dbg(&pdev->dev, "mux-mask\n");
1003 tmp = info->mux_mask;
1004 for (i = 0; i < info->nbanks; i++) {
1005 for (j = 0; j < info->nmux; j++, tmp++) {
1006 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
1007 }
1008 }
1009
1010 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1011 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1012 info->functions = devm_kzalloc(&pdev->dev, info->nfunctions * sizeof(struct at91_pmx_func),
1013 GFP_KERNEL);
1014 if (!info->functions)
1015 return -ENOMEM;
1016
1017 info->groups = devm_kzalloc(&pdev->dev, info->ngroups * sizeof(struct at91_pin_group),
1018 GFP_KERNEL);
1019 if (!info->groups)
1020 return -ENOMEM;
1021
1022 dev_dbg(&pdev->dev, "nbanks = %d\n", info->nbanks);
1023 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1024 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1025
1026 i = 0;
1027
1028 for_each_child_of_node(np, child) {
1029 if (of_device_is_compatible(child, gpio_compat))
1030 continue;
1031 ret = at91_pinctrl_parse_functions(child, info, i++);
1032 if (ret) {
1033 dev_err(&pdev->dev, "failed to parse function\n");
1034 return ret;
1035 }
1036 }
1037
1038 return 0;
1039}
1040
150632b0 1041static int at91_pinctrl_probe(struct platform_device *pdev)
6732ae5c
JCPV		 1042{
1043 struct at91_pinctrl *info;
1044 struct pinctrl_pin_desc *pdesc;
3c93600d 1045 int ret, i, j, k;
6732ae5c
JCPV		 1046
1047 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1048 if (!info)
1049 return -ENOMEM;
1050
1051 ret = at91_pinctrl_probe_dt(pdev, info);
1052 if (ret)
1053 return ret;
1054
1055 /*
1056 * We need all the GPIO drivers to probe FIRST, or we will not be able
1057 * to obtain references to the struct gpio_chip * for them, and we
1058 * need this to proceed.
1059 */
1060 for (i = 0; i < info->nbanks; i++) {
1061 if (!gpio_chips[i]) {
1062 dev_warn(&pdev->dev, "GPIO chip %d not registered yet\n", i);
1063 devm_kfree(&pdev->dev, info);
1064 return -EPROBE_DEFER;
1065 }
1066 }
1067
1068 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1069 at91_pinctrl_desc.npins = info->nbanks * MAX_NB_GPIO_PER_BANK;
1070 at91_pinctrl_desc.pins = pdesc =
1071 devm_kzalloc(&pdev->dev, sizeof(*pdesc) * at91_pinctrl_desc.npins, GFP_KERNEL);
1072
1073 if (!at91_pinctrl_desc.pins)
1074 return -ENOMEM;
1075
1076 for (i = 0 , k = 0; i < info->nbanks; i++) {
1077 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1078 pdesc->number = k;
1079 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1080 pdesc++;
1081 }
1082 }
1083
1084 platform_set_drvdata(pdev, info);
1085 info->pctl = pinctrl_register(&at91_pinctrl_desc, &pdev->dev, info);
1086
1087 if (!info->pctl) {
1088 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1089 ret = -EINVAL;
1090 goto err;
1091 }
1092
1093 /* We will handle a range of GPIO pins */
1094 for (i = 0; i < info->nbanks; i++)
1095 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1096
1097 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1098
1099 return 0;
1100
1101err:
1102 return ret;
1103}
1104
150632b0 1105static int at91_pinctrl_remove(struct platform_device *pdev)
6732ae5c
JCPV		 1106{
1107 struct at91_pinctrl *info = platform_get_drvdata(pdev);
1108
1109 pinctrl_unregister(info->pctl);
1110
1111 return 0;
1112}
1113
1114static int at91_gpio_request(struct gpio_chip *chip, unsigned offset)
1115{
1116 /*
1117 * Map back to global GPIO space and request muxing, the direction
1118 * parameter does not matter for this controller.
1119 */
1120 int gpio = chip->base + offset;
1121 int bank = chip->base / chip->ngpio;
1122
1123 dev_dbg(chip->dev, "%s:%d pio%c%d(%d)\n", __func__, __LINE__,
1124 'A' + bank, offset, gpio);
1125
1126 return pinctrl_request_gpio(gpio);
1127}
1128
1129static void at91_gpio_free(struct gpio_chip *chip, unsigned offset)
1130{
1131 int gpio = chip->base + offset;
1132
1133 pinctrl_free_gpio(gpio);
1134}
1135
8af584b8
RG		 1136static int at91_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
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 u32 osr;
1142
1143 osr = readl_relaxed(pio + PIO_OSR);
1144 return !(osr & mask);
1145}
1146
6732ae5c
JCPV		 1147static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1148{
1149 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1150 void __iomem *pio = at91_gpio->regbase;
1151 unsigned mask = 1 << offset;
1152
1153 writel_relaxed(mask, pio + PIO_ODR);
1154 return 0;
1155}
1156
1157static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1158{
1159 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1160 void __iomem *pio = at91_gpio->regbase;
1161 unsigned mask = 1 << offset;
1162 u32 pdsr;
1163
1164 pdsr = readl_relaxed(pio + PIO_PDSR);
1165 return (pdsr & mask) != 0;
1166}
1167
1168static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1169 int val)
1170{
1171 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1172 void __iomem *pio = at91_gpio->regbase;
1173 unsigned mask = 1 << offset;
1174
1175 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1176}
1177
1178static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1179 int val)
1180{
1181 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1182 void __iomem *pio = at91_gpio->regbase;
1183 unsigned mask = 1 << offset;
1184
1185 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1186 writel_relaxed(mask, pio + PIO_OER);
1187
1188 return 0;
1189}
1190
6732ae5c
JCPV		 1191#ifdef CONFIG_DEBUG_FS
1192static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1193{
1194 enum at91_mux mode;
1195 int i;
1196 struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
1197 void __iomem *pio = at91_gpio->regbase;
1198
1199 for (i = 0; i < chip->ngpio; i++) {
1200 unsigned pin = chip->base + i;
1201 unsigned mask = pin_to_mask(pin);
1202 const char *gpio_label;
1203 u32 pdsr;
1204
1205 gpio_label = gpiochip_is_requested(chip, i);
1206 if (!gpio_label)
1207 continue;
1208 mode = at91_gpio->ops->get_periph(pio, mask);
1209 seq_printf(s, "[%s] GPIO%s%d: ",
1210 gpio_label, chip->label, i);
1211 if (mode == AT91_MUX_GPIO) {
1212 pdsr = readl_relaxed(pio + PIO_PDSR);
1213
1214 seq_printf(s, "[gpio] %s\n",
1215 pdsr & mask ?
1216 "set" : "clear");
1217 } else {
1218 seq_printf(s, "[periph %c]\n",
1219 mode + 'A' - 1);
1220 }
1221 }
1222}
1223#else
1224#define at91_gpio_dbg_show NULL
1225#endif
1226
1227/* Several AIC controller irqs are dispatched through this GPIO handler.
1228 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1229 * at91_set_gpio_input() then maybe enable its glitch filter.
1230 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1231 * handler.
1232 * First implementation always triggers on rising and falling edges
1233 * whereas the newer PIO3 can be additionally configured to trigger on
1234 * level, edge with any polarity.
1235 *
1236 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1237 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1238 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1239 */
1240
1241static void gpio_irq_mask(struct irq_data *d)
1242{
1243 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1244 void __iomem *pio = at91_gpio->regbase;
1245 unsigned mask = 1 << d->hwirq;
1246
1247 if (pio)
1248 writel_relaxed(mask, pio + PIO_IDR);
1249}
1250
1251static void gpio_irq_unmask(struct irq_data *d)
1252{
1253 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1254 void __iomem *pio = at91_gpio->regbase;
1255 unsigned mask = 1 << d->hwirq;
1256
1257 if (pio)
1258 writel_relaxed(mask, pio + PIO_IER);
1259}
1260
1261static int gpio_irq_type(struct irq_data *d, unsigned type)
1262{
1263 switch (type) {
1264 case IRQ_TYPE_NONE:
1265 case IRQ_TYPE_EDGE_BOTH:
1266 return 0;
1267 default:
1268 return -EINVAL;
1269 }
1270}
1271
1272/* Alternate irq type for PIO3 support */
1273static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1274{
1275 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1276 void __iomem *pio = at91_gpio->regbase;
1277 unsigned mask = 1 << d->hwirq;
1278
1279 switch (type) {
1280 case IRQ_TYPE_EDGE_RISING:
b0dcfd87 1281 __irq_set_handler_locked(d->irq, handle_simple_irq);
6732ae5c
JCPV		 1282 writel_relaxed(mask, pio + PIO_ESR);
1283 writel_relaxed(mask, pio + PIO_REHLSR);
1284 break;
1285 case IRQ_TYPE_EDGE_FALLING:
b0dcfd87 1286 __irq_set_handler_locked(d->irq, handle_simple_irq);
6732ae5c
JCPV		 1287 writel_relaxed(mask, pio + PIO_ESR);
1288 writel_relaxed(mask, pio + PIO_FELLSR);
1289 break;
1290 case IRQ_TYPE_LEVEL_LOW:
b0dcfd87 1291 __irq_set_handler_locked(d->irq, handle_level_irq);
6732ae5c
JCPV		 1292 writel_relaxed(mask, pio + PIO_LSR);
1293 writel_relaxed(mask, pio + PIO_FELLSR);
1294 break;
1295 case IRQ_TYPE_LEVEL_HIGH:
b0dcfd87 1296 __irq_set_handler_locked(d->irq, handle_level_irq);
6732ae5c
JCPV		 1297 writel_relaxed(mask, pio + PIO_LSR);
1298 writel_relaxed(mask, pio + PIO_REHLSR);
1299 break;
1300 case IRQ_TYPE_EDGE_BOTH:
1301 /*
1302 * disable additional interrupt modes:
1303 * fall back to default behavior
1304 */
b0dcfd87 1305 __irq_set_handler_locked(d->irq, handle_simple_irq);
6732ae5c
JCPV		 1306 writel_relaxed(mask, pio + PIO_AIMDR);
1307 return 0;
1308 case IRQ_TYPE_NONE:
1309 default:
1310 pr_warn("AT91: No type for irq %d\n", gpio_to_irq(d->irq));
1311 return -EINVAL;
1312 }
1313
1314 /* enable additional interrupt modes */
1315 writel_relaxed(mask, pio + PIO_AIMER);
1316
1317 return 0;
1318}
1319
80cc3732
AS		 1320static void gpio_irq_ack(struct irq_data *d)
1321{
1322 /* the interrupt is already cleared before by reading ISR */
1323}
1324
94e69207
JJH		 1325static unsigned int gpio_irq_startup(struct irq_data *d)
1326{
1327 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1328 unsigned pin = d->hwirq;
1329 int ret;
1330
1331 ret = gpio_lock_as_irq(&at91_gpio->chip, pin);
1332 if (ret) {
1333 dev_err(at91_gpio->chip.dev, "unable to lock pind %lu IRQ\n",
1334 d->hwirq);
1335 return ret;
1336 }
1337 gpio_irq_unmask(d);
1338 return 0;
1339}
1340
1341static void gpio_irq_shutdown(struct irq_data *d)
1342{
1343 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1344 unsigned pin = d->hwirq;
1345
1346 gpio_irq_mask(d);
1347 gpio_unlock_as_irq(&at91_gpio->chip, pin);
1348}
1349
6732ae5c 1350#ifdef CONFIG_PM
647f8d94
LD		 1351
1352static u32 wakeups[MAX_GPIO_BANKS];
1353static u32 backups[MAX_GPIO_BANKS];
1354
6732ae5c
JCPV		 1355static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1356{
1357 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1358 unsigned bank = at91_gpio->pioc_idx;
647f8d94 1359 unsigned mask = 1 << d->hwirq;
6732ae5c
JCPV		 1360
1361 if (unlikely(bank >= MAX_GPIO_BANKS))
1362 return -EINVAL;
1363
647f8d94
LD		 1364 if (state)
1365 wakeups[bank] |= mask;
1366 else
1367 wakeups[bank] &= ~mask;
1368
6732ae5c
JCPV		 1369 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1370
1371 return 0;
1372}
647f8d94
LD		 1373
1374void at91_pinctrl_gpio_suspend(void)
1375{
1376 int i;
1377
1378 for (i = 0; i < gpio_banks; i++) {
1379 void __iomem *pio;
1380
1381 if (!gpio_chips[i])
1382 continue;
1383
1384 pio = gpio_chips[i]->regbase;
1385
1386 backups[i] = __raw_readl(pio + PIO_IMR);
1387 __raw_writel(backups[i], pio + PIO_IDR);
1388 __raw_writel(wakeups[i], pio + PIO_IER);
1389
795f9953
BB		 1390 if (!wakeups[i])
1391 clk_disable_unprepare(gpio_chips[i]->clock);
1392 else
647f8d94
LD		 1393 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
1394 'A'+i, wakeups[i]);
647f8d94
LD		 1395 }
1396}
1397
1398void at91_pinctrl_gpio_resume(void)
1399{
1400 int i;
1401
1402 for (i = 0; i < gpio_banks; i++) {
1403 void __iomem *pio;
1404
1405 if (!gpio_chips[i])
1406 continue;
1407
1408 pio = gpio_chips[i]->regbase;
1409
37ef1d92
BB		 1410 if (!wakeups[i])
1411 clk_prepare_enable(gpio_chips[i]->clock);
647f8d94
LD		 1412
1413 __raw_writel(wakeups[i], pio + PIO_IDR);
1414 __raw_writel(backups[i], pio + PIO_IER);
1415 }
1416}
1417
6732ae5c
JCPV		 1418#else
1419#define gpio_irq_set_wake NULL
647f8d94 1420#endif /* CONFIG_PM */
6732ae5c
JCPV		 1421
1422static struct irq_chip gpio_irqchip = {
1423 .name = "GPIO",
80cc3732 1424 .irq_ack = gpio_irq_ack,
94e69207
JJH		 1425 .irq_startup = gpio_irq_startup,
1426 .irq_shutdown = gpio_irq_shutdown,
6732ae5c
JCPV		 1427 .irq_disable = gpio_irq_mask,
1428 .irq_mask = gpio_irq_mask,
1429 .irq_unmask = gpio_irq_unmask,
1430 /* .irq_set_type is set dynamically */
1431 .irq_set_wake = gpio_irq_set_wake,
1432};
1433
1434static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
1435{
80cc3732
AS		 1436 struct irq_chip *chip = irq_get_chip(irq);
1437 struct gpio_chip *gpio_chip = irq_desc_get_handler_data(desc);
1438 struct at91_gpio_chip *at91_gpio = container_of(gpio_chip,
1439 struct at91_gpio_chip, chip);
1440
6732ae5c
JCPV		 1441 void __iomem *pio = at91_gpio->regbase;
1442 unsigned long isr;
1443 int n;
1444
1445 chained_irq_enter(chip, desc);
1446 for (;;) {
1447 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
c2eb9e7f 1448 * When there are none pending, we're finished unless we need
6732ae5c
JCPV		 1449 * to process multiple banks (like ID_PIOCDE on sam9263).
1450 */
1451 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1452 if (!isr) {
1453 if (!at91_gpio->next)
1454 break;
1455 at91_gpio = at91_gpio->next;
1456 pio = at91_gpio->regbase;
1457 continue;
1458 }
1459
05daa16a 1460 for_each_set_bit(n, &isr, BITS_PER_LONG) {
80cc3732
AS		 1461 generic_handle_irq(irq_find_mapping(
1462 gpio_chip->irqdomain, n));
6732ae5c
JCPV		 1463 }
1464 }
1465 chained_irq_exit(chip, desc);
1466 /* now it may re-trigger */
1467}
1468
6732ae5c
JCPV		 1469static int at91_gpio_of_irq_setup(struct device_node *node,
1470 struct at91_gpio_chip *at91_gpio)
1471{
6732ae5c 1472 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
80cc3732 1473 int ret;
6732ae5c
JCPV		 1474
1475 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1476
1477 /* Setup proper .irq_set_type function */
1478 gpio_irqchip.irq_set_type = at91_gpio->ops->irq_type;
1479
1480 /* Disable irqs of this PIO controller */
1481 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1482
80cc3732
AS		 1483 /*
1484 * Let the generic code handle this edge IRQ, the the chained
1485 * handler will perform the actual work of handling the parent
1486 * interrupt.
1487 */
1488 ret = gpiochip_irqchip_add(&at91_gpio->chip,
1489 &gpio_irqchip,
1490 0,
1491 handle_edge_irq,
1492 IRQ_TYPE_EDGE_BOTH);
1493 if (ret)
6732ae5c
JCPV		 1494 panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n",
1495 at91_gpio->pioc_idx);
1496
80cc3732
AS		 1497 /* Then register the chain on the parent IRQ */
1498 gpiochip_set_chained_irqchip(&at91_gpio->chip,
1499 &gpio_irqchip,
1500 at91_gpio->pioc_virq,
1501 gpio_irq_handler);
6732ae5c
JCPV		 1502
1503 return 0;
1504}
1505
1506/* This structure is replicated for each GPIO block allocated at probe time */
1507static struct gpio_chip at91_gpio_template = {
1508 .request = at91_gpio_request,
1509 .free = at91_gpio_free,
8af584b8 1510 .get_direction = at91_gpio_get_direction,
6732ae5c
JCPV		 1511 .direction_input = at91_gpio_direction_input,
1512 .get = at91_gpio_get,
1513 .direction_output = at91_gpio_direction_output,
1514 .set = at91_gpio_set,
6732ae5c 1515 .dbg_show = at91_gpio_dbg_show,
9fb1f39e 1516 .can_sleep = false,
6732ae5c
JCPV		 1517 .ngpio = MAX_NB_GPIO_PER_BANK,
1518};
1519
150632b0 1520static void at91_gpio_probe_fixup(void)
6732ae5c
JCPV		 1521{
1522 unsigned i;
1523 struct at91_gpio_chip *at91_gpio, *last = NULL;
1524
1525 for (i = 0; i < gpio_banks; i++) {
1526 at91_gpio = gpio_chips[i];
1527
1528 /*
1529 * GPIO controller are grouped on some SoC:
1530 * PIOC, PIOD and PIOE can share the same IRQ line
1531 */
1532 if (last && last->pioc_virq == at91_gpio->pioc_virq)
1533 last->next = at91_gpio;
1534 last = at91_gpio;
1535 }
1536}
1537
150632b0 1538static struct of_device_id at91_gpio_of_match[] = {
6732ae5c
JCPV		 1539 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1540 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1541 { /* sentinel */ }
1542};
1543
150632b0 1544static int at91_gpio_probe(struct platform_device *pdev)
6732ae5c
JCPV		 1545{
1546 struct device_node *np = pdev->dev.of_node;
1547 struct resource *res;
1548 struct at91_gpio_chip *at91_chip = NULL;
1549 struct gpio_chip *chip;
1550 struct pinctrl_gpio_range *range;
1551 int ret = 0;
32b01a36 1552 int irq, i;
6732ae5c
JCPV		 1553 int alias_idx = of_alias_get_id(np, "gpio");
1554 uint32_t ngpio;
32b01a36 1555 char **names;
6732ae5c
JCPV		 1556
1557 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1558 if (gpio_chips[alias_idx]) {
1559 ret = -EBUSY;
1560 goto err;
1561 }
1562
6732ae5c
JCPV		 1563 irq = platform_get_irq(pdev, 0);
1564 if (irq < 0) {
1565 ret = irq;
1566 goto err;
1567 }
1568
1569 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1570 if (!at91_chip) {
1571 ret = -ENOMEM;
1572 goto err;
1573 }
1574
f50b9e12 1575 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
9e0c1fb2
TR		 1576 at91_chip->regbase = devm_ioremap_resource(&pdev->dev, res);
1577 if (IS_ERR(at91_chip->regbase)) {
1578 ret = PTR_ERR(at91_chip->regbase);
6732ae5c
JCPV		 1579 goto err;
1580 }
1581
3c93600d 1582 at91_chip->ops = (struct at91_pinctrl_mux_ops *)
6732ae5c
JCPV		 1583 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1584 at91_chip->pioc_virq = irq;
1585 at91_chip->pioc_idx = alias_idx;
1586
1587 at91_chip->clock = clk_get(&pdev->dev, NULL);
1588 if (IS_ERR(at91_chip->clock)) {
1589 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1590 goto err;
1591 }
1592
1593 if (clk_prepare(at91_chip->clock))
1594 goto clk_prep_err;
1595
1596 /* enable PIO controller's clock */
1597 if (clk_enable(at91_chip->clock)) {
1598 dev_err(&pdev->dev, "failed to enable clock, ignoring.\n");
1599 goto clk_err;
1600 }
1601
1602 at91_chip->chip = at91_gpio_template;
1603
1604 chip = &at91_chip->chip;
1605 chip->of_node = np;
1606 chip->label = dev_name(&pdev->dev);
1607 chip->dev = &pdev->dev;
1608 chip->owner = THIS_MODULE;
1609 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1610
1611 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1612 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1613 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1614 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1615 else
1616 chip->ngpio = ngpio;
1617 }
1618
3c93600d
SK		 1619 names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
1620 GFP_KERNEL);
32b01a36
JCPV		 1621
1622 if (!names) {
1623 ret = -ENOMEM;
1624 goto clk_err;
1625 }
1626
1627 for (i = 0; i < chip->ngpio; i++)
1628 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1629
3c93600d 1630 chip->names = (const char *const *)names;
32b01a36 1631
6732ae5c
JCPV		 1632 range = &at91_chip->range;
1633 range->name = chip->label;
1634 range->id = alias_idx;
1635 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1636
1637 range->npins = chip->ngpio;
1638 range->gc = chip;
1639
1640 ret = gpiochip_add(chip);
1641 if (ret)
1642 goto clk_err;
1643
1644 gpio_chips[alias_idx] = at91_chip;
1645 gpio_banks = max(gpio_banks, alias_idx + 1);
1646
1647 at91_gpio_probe_fixup();
1648
1649 at91_gpio_of_irq_setup(np, at91_chip);
1650
1651 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1652
1653 return 0;
1654
1655clk_err:
1656 clk_unprepare(at91_chip->clock);
1657clk_prep_err:
1658 clk_put(at91_chip->clock);
1659err:
1660 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1661
1662 return ret;
1663}
1664
1665static struct platform_driver at91_gpio_driver = {
1666 .driver = {
1667 .name = "gpio-at91",
1668 .owner = THIS_MODULE,
606fca94 1669 .of_match_table = at91_gpio_of_match,
6732ae5c
JCPV		 1670 },
1671 .probe = at91_gpio_probe,
1672};
1673
1674static struct platform_driver at91_pinctrl_driver = {
1675 .driver = {
1676 .name = "pinctrl-at91",
1677 .owner = THIS_MODULE,
606fca94 1678 .of_match_table = at91_pinctrl_of_match,
6732ae5c
JCPV		 1679 },
1680 .probe = at91_pinctrl_probe,
150632b0 1681 .remove = at91_pinctrl_remove,
6732ae5c
JCPV		 1682};
1683
1684static int __init at91_pinctrl_init(void)
1685{
1686 int ret;
1687
1688 ret = platform_driver_register(&at91_gpio_driver);
1689 if (ret)
1690 return ret;
1691 return platform_driver_register(&at91_pinctrl_driver);
1692}
1693arch_initcall(at91_pinctrl_init);
1694
1695static void __exit at91_pinctrl_exit(void)
1696{
1697 platform_driver_unregister(&at91_pinctrl_driver);
1698}
1699
1700module_exit(at91_pinctrl_exit);
1701MODULE_AUTHOR("Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>");
1702MODULE_DESCRIPTION("Atmel AT91 pinctrl driver");
1703MODULE_LICENSE("GPL v2");
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