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bpf: Prevent memory disambiguation attack
[linux/fpc-iii.git] / drivers / pinctrl / samsung / pinctrl-samsung.c
blob336e88d7bdb9bbe69496c25cc510007aec858cc3
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // pin-controller/pin-mux/pin-config/gpio-driver for Samsung's SoC's.
4 //
5 // Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 // http://www.samsung.com
7 // Copyright (c) 2012 Linaro Ltd
8 // http://www.linaro.org
9 //
10 // Author: Thomas Abraham <thomas.ab@samsung.com>
11 //
12 // This driver implements the Samsung pinctrl driver. It supports setting up of
13 // pinmux and pinconf configurations. The gpiolib interface is also included.
14 // External interrupt (gpio and wakeup) support are not included in this driver
15 // but provides extensions to which platform specific implementation of the gpio
16 // and wakeup interrupts can be hooked to.
17
18 #include <linux/init.h>
19 #include <linux/platform_device.h>
20 #include <linux/io.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 #include <linux/gpio.h>
24 #include <linux/irqdomain.h>
25 #include <linux/of_device.h>
26 #include <linux/spinlock.h>
27
28 #include <dt-bindings/pinctrl/samsung.h>
29
30 #include "../core.h"
31 #include "pinctrl-samsung.h"
32
33 /* maximum number of the memory resources */
34 #define SAMSUNG_PINCTRL_NUM_RESOURCES 2
35
36 /* list of all possible config options supported */
37 static struct pin_config {
38 const char *property;
39 enum pincfg_type param;
40 } cfg_params[] = {
41 { "samsung,pin-pud", PINCFG_TYPE_PUD },
42 { "samsung,pin-drv", PINCFG_TYPE_DRV },
43 { "samsung,pin-con-pdn", PINCFG_TYPE_CON_PDN },
44 { "samsung,pin-pud-pdn", PINCFG_TYPE_PUD_PDN },
45 { "samsung,pin-val", PINCFG_TYPE_DAT },
46 };
47
48 static unsigned int pin_base;
49
50 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
51 {
52 struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
53
54 return pmx->nr_groups;
55 }
56
57 static const char *samsung_get_group_name(struct pinctrl_dev *pctldev,
58 unsigned group)
59 {
60 struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
61
62 return pmx->pin_groups[group].name;
63 }
64
65 static int samsung_get_group_pins(struct pinctrl_dev *pctldev,
66 unsigned group,
67 const unsigned **pins,
68 unsigned *num_pins)
69 {
70 struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
71
72 *pins = pmx->pin_groups[group].pins;
73 *num_pins = pmx->pin_groups[group].num_pins;
74
75 return 0;
76 }
77
78 static int reserve_map(struct device *dev, struct pinctrl_map **map,
79 unsigned *reserved_maps, unsigned *num_maps,
80 unsigned reserve)
81 {
82 unsigned old_num = *reserved_maps;
83 unsigned new_num = *num_maps + reserve;
84 struct pinctrl_map *new_map;
85
86 if (old_num >= new_num)
87 return 0;
88
89 new_map = krealloc(*map, sizeof(*new_map) * new_num, GFP_KERNEL);
90 if (!new_map)
91 return -ENOMEM;
92
93 memset(new_map + old_num, 0, (new_num - old_num) * sizeof(*new_map));
94
95 *map = new_map;
96 *reserved_maps = new_num;
97
98 return 0;
99 }
100
101 static int add_map_mux(struct pinctrl_map **map, unsigned *reserved_maps,
102 unsigned *num_maps, const char *group,
103 const char *function)
104 {
105 if (WARN_ON(*num_maps == *reserved_maps))
106 return -ENOSPC;
107
108 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
109 (*map)[*num_maps].data.mux.group = group;
110 (*map)[*num_maps].data.mux.function = function;
111 (*num_maps)++;
112
113 return 0;
114 }
115
116 static int add_map_configs(struct device *dev, struct pinctrl_map **map,
117 unsigned *reserved_maps, unsigned *num_maps,
118 const char *group, unsigned long *configs,
119 unsigned num_configs)
120 {
121 unsigned long *dup_configs;
122
123 if (WARN_ON(*num_maps == *reserved_maps))
124 return -ENOSPC;
125
126 dup_configs = kmemdup(configs, num_configs * sizeof(*dup_configs),
127 GFP_KERNEL);
128 if (!dup_configs)
129 return -ENOMEM;
130
131 (*map)[*num_maps].type = PIN_MAP_TYPE_CONFIGS_GROUP;
132 (*map)[*num_maps].data.configs.group_or_pin = group;
133 (*map)[*num_maps].data.configs.configs = dup_configs;
134 (*map)[*num_maps].data.configs.num_configs = num_configs;
135 (*num_maps)++;
136
137 return 0;
138 }
139
140 static int add_config(struct device *dev, unsigned long **configs,
141 unsigned *num_configs, unsigned long config)
142 {
143 unsigned old_num = *num_configs;
144 unsigned new_num = old_num + 1;
145 unsigned long *new_configs;
146
147 new_configs = krealloc(*configs, sizeof(*new_configs) * new_num,
148 GFP_KERNEL);
149 if (!new_configs)
150 return -ENOMEM;
151
152 new_configs[old_num] = config;
153
154 *configs = new_configs;
155 *num_configs = new_num;
156
157 return 0;
158 }
159
160 static void samsung_dt_free_map(struct pinctrl_dev *pctldev,
161 struct pinctrl_map *map,
162 unsigned num_maps)
163 {
164 int i;
165
166 for (i = 0; i < num_maps; i++)
167 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
168 kfree(map[i].data.configs.configs);
169
170 kfree(map);
171 }
172
173 static int samsung_dt_subnode_to_map(struct samsung_pinctrl_drv_data *drvdata,
174 struct device *dev,
175 struct device_node *np,
176 struct pinctrl_map **map,
177 unsigned *reserved_maps,
178 unsigned *num_maps)
179 {
180 int ret, i;
181 u32 val;
182 unsigned long config;
183 unsigned long *configs = NULL;
184 unsigned num_configs = 0;
185 unsigned reserve;
186 struct property *prop;
187 const char *group;
188 bool has_func = false;
189
190 ret = of_property_read_u32(np, "samsung,pin-function", &val);
191 if (!ret)
192 has_func = true;
193
194 for (i = 0; i < ARRAY_SIZE(cfg_params); i++) {
195 ret = of_property_read_u32(np, cfg_params[i].property, &val);
196 if (!ret) {
197 config = PINCFG_PACK(cfg_params[i].param, val);
198 ret = add_config(dev, &configs, &num_configs, config);
199 if (ret < 0)
200 goto exit;
201 /* EINVAL=missing, which is fine since it's optional */
202 } else if (ret != -EINVAL) {
203 dev_err(dev, "could not parse property %s\n",
204 cfg_params[i].property);
205 }
206 }
207
208 reserve = 0;
209 if (has_func)
210 reserve++;
211 if (num_configs)
212 reserve++;
213 ret = of_property_count_strings(np, "samsung,pins");
214 if (ret < 0) {
215 dev_err(dev, "could not parse property samsung,pins\n");
216 goto exit;
217 }
218 reserve *= ret;
219
220 ret = reserve_map(dev, map, reserved_maps, num_maps, reserve);
221 if (ret < 0)
222 goto exit;
223
224 of_property_for_each_string(np, "samsung,pins", prop, group) {
225 if (has_func) {
226 ret = add_map_mux(map, reserved_maps,
227 num_maps, group, np->full_name);
228 if (ret < 0)
229 goto exit;
230 }
231
232 if (num_configs) {
233 ret = add_map_configs(dev, map, reserved_maps,
234 num_maps, group, configs,
235 num_configs);
236 if (ret < 0)
237 goto exit;
238 }
239 }
240
241 ret = 0;
242
243 exit:
244 kfree(configs);
245 return ret;
246 }
247
248 static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
249 struct device_node *np_config,
250 struct pinctrl_map **map,
251 unsigned *num_maps)
252 {
253 struct samsung_pinctrl_drv_data *drvdata;
254 unsigned reserved_maps;
255 struct device_node *np;
256 int ret;
257
258 drvdata = pinctrl_dev_get_drvdata(pctldev);
259
260 reserved_maps = 0;
261 *map = NULL;
262 *num_maps = 0;
263
264 if (!of_get_child_count(np_config))
265 return samsung_dt_subnode_to_map(drvdata, pctldev->dev,
266 np_config, map,
267 &reserved_maps,
268 num_maps);
269
270 for_each_child_of_node(np_config, np) {
271 ret = samsung_dt_subnode_to_map(drvdata, pctldev->dev, np, map,
272 &reserved_maps, num_maps);
273 if (ret < 0) {
274 samsung_dt_free_map(pctldev, *map, *num_maps);
275 return ret;
276 }
277 }
278
279 return 0;
280 }
281
282 /* list of pinctrl callbacks for the pinctrl core */
283 static const struct pinctrl_ops samsung_pctrl_ops = {
284 .get_groups_count = samsung_get_group_count,
285 .get_group_name = samsung_get_group_name,
286 .get_group_pins = samsung_get_group_pins,
287 .dt_node_to_map = samsung_dt_node_to_map,
288 .dt_free_map = samsung_dt_free_map,
289 };
290
291 /* check if the selector is a valid pin function selector */
292 static int samsung_get_functions_count(struct pinctrl_dev *pctldev)
293 {
294 struct samsung_pinctrl_drv_data *drvdata;
295
296 drvdata = pinctrl_dev_get_drvdata(pctldev);
297 return drvdata->nr_functions;
298 }
299
300 /* return the name of the pin function specified */
301 static const char *samsung_pinmux_get_fname(struct pinctrl_dev *pctldev,
302 unsigned selector)
303 {
304 struct samsung_pinctrl_drv_data *drvdata;
305
306 drvdata = pinctrl_dev_get_drvdata(pctldev);
307 return drvdata->pmx_functions[selector].name;
308 }
309
310 /* return the groups associated for the specified function selector */
311 static int samsung_pinmux_get_groups(struct pinctrl_dev *pctldev,
312 unsigned selector, const char * const **groups,
313 unsigned * const num_groups)
314 {
315 struct samsung_pinctrl_drv_data *drvdata;
316
317 drvdata = pinctrl_dev_get_drvdata(pctldev);
318 *groups = drvdata->pmx_functions[selector].groups;
319 *num_groups = drvdata->pmx_functions[selector].num_groups;
320 return 0;
321 }
322
323 /*
324 * given a pin number that is local to a pin controller, find out the pin bank
325 * and the register base of the pin bank.
326 */
327 static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
328 unsigned pin, void __iomem **reg, u32 *offset,
329 struct samsung_pin_bank **bank)
330 {
331 struct samsung_pin_bank *b;
332
333 b = drvdata->pin_banks;
334
335 while ((pin >= b->pin_base) &&
336 ((b->pin_base + b->nr_pins - 1) < pin))
337 b++;
338
339 *reg = b->pctl_base + b->pctl_offset;
340 *offset = pin - b->pin_base;
341 if (bank)
342 *bank = b;
343 }
344
345 /* enable or disable a pinmux function */
346 static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
347 unsigned group)
348 {
349 struct samsung_pinctrl_drv_data *drvdata;
350 const struct samsung_pin_bank_type *type;
351 struct samsung_pin_bank *bank;
352 void __iomem *reg;
353 u32 mask, shift, data, pin_offset;
354 unsigned long flags;
355 const struct samsung_pmx_func *func;
356 const struct samsung_pin_group *grp;
357
358 drvdata = pinctrl_dev_get_drvdata(pctldev);
359 func = &drvdata->pmx_functions[selector];
360 grp = &drvdata->pin_groups[group];
361
362 pin_to_reg_bank(drvdata, grp->pins[0] - drvdata->pin_base,
363 &reg, &pin_offset, &bank);
364 type = bank->type;
365 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
366 shift = pin_offset * type->fld_width[PINCFG_TYPE_FUNC];
367 if (shift >= 32) {
368 /* Some banks have two config registers */
369 shift -= 32;
370 reg += 4;
371 }
372
373 spin_lock_irqsave(&bank->slock, flags);
374
375 data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
376 data &= ~(mask << shift);
377 data |= func->val << shift;
378 writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
379
380 spin_unlock_irqrestore(&bank->slock, flags);
381 }
382
383 /* enable a specified pinmux by writing to registers */
384 static int samsung_pinmux_set_mux(struct pinctrl_dev *pctldev,
385 unsigned selector,
386 unsigned group)
387 {
388 samsung_pinmux_setup(pctldev, selector, group);
389 return 0;
390 }
391
392 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
393 static const struct pinmux_ops samsung_pinmux_ops = {
394 .get_functions_count = samsung_get_functions_count,
395 .get_function_name = samsung_pinmux_get_fname,
396 .get_function_groups = samsung_pinmux_get_groups,
397 .set_mux = samsung_pinmux_set_mux,
398 };
399
400 /* set or get the pin config settings for a specified pin */
401 static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
402 unsigned long *config, bool set)
403 {
404 struct samsung_pinctrl_drv_data *drvdata;
405 const struct samsung_pin_bank_type *type;
406 struct samsung_pin_bank *bank;
407 void __iomem *reg_base;
408 enum pincfg_type cfg_type = PINCFG_UNPACK_TYPE(*config);
409 u32 data, width, pin_offset, mask, shift;
410 u32 cfg_value, cfg_reg;
411 unsigned long flags;
412
413 drvdata = pinctrl_dev_get_drvdata(pctldev);
414 pin_to_reg_bank(drvdata, pin - drvdata->pin_base, &reg_base,
415 &pin_offset, &bank);
416 type = bank->type;
417
418 if (cfg_type >= PINCFG_TYPE_NUM || !type->fld_width[cfg_type])
419 return -EINVAL;
420
421 width = type->fld_width[cfg_type];
422 cfg_reg = type->reg_offset[cfg_type];
423
424 spin_lock_irqsave(&bank->slock, flags);
425
426 mask = (1 << width) - 1;
427 shift = pin_offset * width;
428 data = readl(reg_base + cfg_reg);
429
430 if (set) {
431 cfg_value = PINCFG_UNPACK_VALUE(*config);
432 data &= ~(mask << shift);
433 data |= (cfg_value << shift);
434 writel(data, reg_base + cfg_reg);
435 } else {
436 data >>= shift;
437 data &= mask;
438 *config = PINCFG_PACK(cfg_type, data);
439 }
440
441 spin_unlock_irqrestore(&bank->slock, flags);
442
443 return 0;
444 }
445
446 /* set the pin config settings for a specified pin */
447 static int samsung_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
448 unsigned long *configs, unsigned num_configs)
449 {
450 int i, ret;
451
452 for (i = 0; i < num_configs; i++) {
453 ret = samsung_pinconf_rw(pctldev, pin, &configs[i], true);
454 if (ret < 0)
455 return ret;
456 } /* for each config */
457
458 return 0;
459 }
460
461 /* get the pin config settings for a specified pin */
462 static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
463 unsigned long *config)
464 {
465 return samsung_pinconf_rw(pctldev, pin, config, false);
466 }
467
468 /* set the pin config settings for a specified pin group */
469 static int samsung_pinconf_group_set(struct pinctrl_dev *pctldev,
470 unsigned group, unsigned long *configs,
471 unsigned num_configs)
472 {
473 struct samsung_pinctrl_drv_data *drvdata;
474 const unsigned int *pins;
475 unsigned int cnt;
476
477 drvdata = pinctrl_dev_get_drvdata(pctldev);
478 pins = drvdata->pin_groups[group].pins;
479
480 for (cnt = 0; cnt < drvdata->pin_groups[group].num_pins; cnt++)
481 samsung_pinconf_set(pctldev, pins[cnt], configs, num_configs);
482
483 return 0;
484 }
485
486 /* get the pin config settings for a specified pin group */
487 static int samsung_pinconf_group_get(struct pinctrl_dev *pctldev,
488 unsigned int group, unsigned long *config)
489 {
490 struct samsung_pinctrl_drv_data *drvdata;
491 const unsigned int *pins;
492
493 drvdata = pinctrl_dev_get_drvdata(pctldev);
494 pins = drvdata->pin_groups[group].pins;
495 samsung_pinconf_get(pctldev, pins[0], config);
496 return 0;
497 }
498
499 /* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
500 static const struct pinconf_ops samsung_pinconf_ops = {
501 .pin_config_get = samsung_pinconf_get,
502 .pin_config_set = samsung_pinconf_set,
503 .pin_config_group_get = samsung_pinconf_group_get,
504 .pin_config_group_set = samsung_pinconf_group_set,
505 };
506
507 /*
508 * The samsung_gpio_set_vlaue() should be called with "bank->slock" held
509 * to avoid race condition.
510 */
511 static void samsung_gpio_set_value(struct gpio_chip *gc,
512 unsigned offset, int value)
513 {
514 struct samsung_pin_bank *bank = gpiochip_get_data(gc);
515 const struct samsung_pin_bank_type *type = bank->type;
516 void __iomem *reg;
517 u32 data;
518
519 reg = bank->pctl_base + bank->pctl_offset;
520
521 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
522 data &= ~(1 << offset);
523 if (value)
524 data |= 1 << offset;
525 writel(data, reg + type->reg_offset[PINCFG_TYPE_DAT]);
526 }
527
528 /* gpiolib gpio_set callback function */
529 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
530 {
531 struct samsung_pin_bank *bank = gpiochip_get_data(gc);
532 unsigned long flags;
533
534 spin_lock_irqsave(&bank->slock, flags);
535 samsung_gpio_set_value(gc, offset, value);
536 spin_unlock_irqrestore(&bank->slock, flags);
537 }
538
539 /* gpiolib gpio_get callback function */
540 static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
541 {
542 void __iomem *reg;
543 u32 data;
544 struct samsung_pin_bank *bank = gpiochip_get_data(gc);
545 const struct samsung_pin_bank_type *type = bank->type;
546
547 reg = bank->pctl_base + bank->pctl_offset;
548
549 data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
550 data >>= offset;
551 data &= 1;
552 return data;
553 }
554
555 /*
556 * The samsung_gpio_set_direction() should be called with "bank->slock" held
557 * to avoid race condition.
558 * The calls to gpio_direction_output() and gpio_direction_input()
559 * leads to this function call.
560 */
561 static int samsung_gpio_set_direction(struct gpio_chip *gc,
562 unsigned offset, bool input)
563 {
564 const struct samsung_pin_bank_type *type;
565 struct samsung_pin_bank *bank;
566 void __iomem *reg;
567 u32 data, mask, shift;
568
569 bank = gpiochip_get_data(gc);
570 type = bank->type;
571
572 reg = bank->pctl_base + bank->pctl_offset
573 + type->reg_offset[PINCFG_TYPE_FUNC];
574
575 mask = (1 << type->fld_width[PINCFG_TYPE_FUNC]) - 1;
576 shift = offset * type->fld_width[PINCFG_TYPE_FUNC];
577 if (shift >= 32) {
578 /* Some banks have two config registers */
579 shift -= 32;
580 reg += 4;
581 }
582
583 data = readl(reg);
584 data &= ~(mask << shift);
585 if (!input)
586 data |= EXYNOS_PIN_FUNC_OUTPUT << shift;
587 writel(data, reg);
588
589 return 0;
590 }
591
592 /* gpiolib gpio_direction_input callback function. */
593 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
594 {
595 struct samsung_pin_bank *bank = gpiochip_get_data(gc);
596 unsigned long flags;
597 int ret;
598
599 spin_lock_irqsave(&bank->slock, flags);
600 ret = samsung_gpio_set_direction(gc, offset, true);
601 spin_unlock_irqrestore(&bank->slock, flags);
602 return ret;
603 }
604
605 /* gpiolib gpio_direction_output callback function. */
606 static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
607 int value)
608 {
609 struct samsung_pin_bank *bank = gpiochip_get_data(gc);
610 unsigned long flags;
611 int ret;
612
613 spin_lock_irqsave(&bank->slock, flags);
614 samsung_gpio_set_value(gc, offset, value);
615 ret = samsung_gpio_set_direction(gc, offset, false);
616 spin_unlock_irqrestore(&bank->slock, flags);
617
618 return ret;
619 }
620
621 /*
622 * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
623 * and a virtual IRQ, if not already present.
624 */
625 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
626 {
627 struct samsung_pin_bank *bank = gpiochip_get_data(gc);
628 unsigned int virq;
629
630 if (!bank->irq_domain)
631 return -ENXIO;
632
633 virq = irq_create_mapping(bank->irq_domain, offset);
634
635 return (virq) ? : -ENXIO;
636 }
637
638 static struct samsung_pin_group *samsung_pinctrl_create_groups(
639 struct device *dev,
640 struct samsung_pinctrl_drv_data *drvdata,
641 unsigned int *cnt)
642 {
643 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
644 struct samsung_pin_group *groups, *grp;
645 const struct pinctrl_pin_desc *pdesc;
646 int i;
647
648 groups = devm_kzalloc(dev, ctrldesc->npins * sizeof(*groups),
649 GFP_KERNEL);
650 if (!groups)
651 return ERR_PTR(-EINVAL);
652 grp = groups;
653
654 pdesc = ctrldesc->pins;
655 for (i = 0; i < ctrldesc->npins; ++i, ++pdesc, ++grp) {
656 grp->name = pdesc->name;
657 grp->pins = &pdesc->number;
658 grp->num_pins = 1;
659 }
660
661 *cnt = ctrldesc->npins;
662 return groups;
663 }
664
665 static int samsung_pinctrl_create_function(struct device *dev,
666 struct samsung_pinctrl_drv_data *drvdata,
667 struct device_node *func_np,
668 struct samsung_pmx_func *func)
669 {
670 int npins;
671 int ret;
672 int i;
673
674 if (of_property_read_u32(func_np, "samsung,pin-function", &func->val))
675 return 0;
676
677 npins = of_property_count_strings(func_np, "samsung,pins");
678 if (npins < 1) {
679 dev_err(dev, "invalid pin list in %pOFn node", func_np);
680 return -EINVAL;
681 }
682
683 func->name = func_np->full_name;
684
685 func->groups = devm_kzalloc(dev, npins * sizeof(char *), GFP_KERNEL);
686 if (!func->groups)
687 return -ENOMEM;
688
689 for (i = 0; i < npins; ++i) {
690 const char *gname;
691
692 ret = of_property_read_string_index(func_np, "samsung,pins",
693 i, &gname);
694 if (ret) {
695 dev_err(dev,
696 "failed to read pin name %d from %pOFn node\n",
697 i, func_np);
698 return ret;
699 }
700
701 func->groups[i] = gname;
702 }
703
704 func->num_groups = npins;
705 return 1;
706 }
707
708 static struct samsung_pmx_func *samsung_pinctrl_create_functions(
709 struct device *dev,
710 struct samsung_pinctrl_drv_data *drvdata,
711 unsigned int *cnt)
712 {
713 struct samsung_pmx_func *functions, *func;
714 struct device_node *dev_np = dev->of_node;
715 struct device_node *cfg_np;
716 unsigned int func_cnt = 0;
717 int ret;
718
719 /*
720 * Iterate over all the child nodes of the pin controller node
721 * and create pin groups and pin function lists.
722 */
723 for_each_child_of_node(dev_np, cfg_np) {
724 struct device_node *func_np;
725
726 if (!of_get_child_count(cfg_np)) {
727 if (!of_find_property(cfg_np,
728 "samsung,pin-function", NULL))
729 continue;
730 ++func_cnt;
731 continue;
732 }
733
734 for_each_child_of_node(cfg_np, func_np) {
735 if (!of_find_property(func_np,
736 "samsung,pin-function", NULL))
737 continue;
738 ++func_cnt;
739 }
740 }
741
742 functions = devm_kzalloc(dev, func_cnt * sizeof(*functions),
743 GFP_KERNEL);
744 if (!functions)
745 return ERR_PTR(-ENOMEM);
746 func = functions;
747
748 /*
749 * Iterate over all the child nodes of the pin controller node
750 * and create pin groups and pin function lists.
751 */
752 func_cnt = 0;
753 for_each_child_of_node(dev_np, cfg_np) {
754 struct device_node *func_np;
755
756 if (!of_get_child_count(cfg_np)) {
757 ret = samsung_pinctrl_create_function(dev, drvdata,
758 cfg_np, func);
759 if (ret < 0)
760 return ERR_PTR(ret);
761 if (ret > 0) {
762 ++func;
763 ++func_cnt;
764 }
765 continue;
766 }
767
768 for_each_child_of_node(cfg_np, func_np) {
769 ret = samsung_pinctrl_create_function(dev, drvdata,
770 func_np, func);
771 if (ret < 0)
772 return ERR_PTR(ret);
773 if (ret > 0) {
774 ++func;
775 ++func_cnt;
776 }
777 }
778 }
779
780 *cnt = func_cnt;
781 return functions;
782 }
783
784 /*
785 * Parse the information about all the available pin groups and pin functions
786 * from device node of the pin-controller. A pin group is formed with all
787 * the pins listed in the "samsung,pins" property.
788 */
789
790 static int samsung_pinctrl_parse_dt(struct platform_device *pdev,
791 struct samsung_pinctrl_drv_data *drvdata)
792 {
793 struct device *dev = &pdev->dev;
794 struct samsung_pin_group *groups;
795 struct samsung_pmx_func *functions;
796 unsigned int grp_cnt = 0, func_cnt = 0;
797
798 groups = samsung_pinctrl_create_groups(dev, drvdata, &grp_cnt);
799 if (IS_ERR(groups)) {
800 dev_err(dev, "failed to parse pin groups\n");
801 return PTR_ERR(groups);
802 }
803
804 functions = samsung_pinctrl_create_functions(dev, drvdata, &func_cnt);
805 if (IS_ERR(functions)) {
806 dev_err(dev, "failed to parse pin functions\n");
807 return PTR_ERR(functions);
808 }
809
810 drvdata->pin_groups = groups;
811 drvdata->nr_groups = grp_cnt;
812 drvdata->pmx_functions = functions;
813 drvdata->nr_functions = func_cnt;
814
815 return 0;
816 }
817
818 /* register the pinctrl interface with the pinctrl subsystem */
819 static int samsung_pinctrl_register(struct platform_device *pdev,
820 struct samsung_pinctrl_drv_data *drvdata)
821 {
822 struct pinctrl_desc *ctrldesc = &drvdata->pctl;
823 struct pinctrl_pin_desc *pindesc, *pdesc;
824 struct samsung_pin_bank *pin_bank;
825 char *pin_names;
826 int pin, bank, ret;
827
828 ctrldesc->name = "samsung-pinctrl";
829 ctrldesc->owner = THIS_MODULE;
830 ctrldesc->pctlops = &samsung_pctrl_ops;
831 ctrldesc->pmxops = &samsung_pinmux_ops;
832 ctrldesc->confops = &samsung_pinconf_ops;
833
834 pindesc = devm_kzalloc(&pdev->dev, sizeof(*pindesc) *
835 drvdata->nr_pins, GFP_KERNEL);
836 if (!pindesc)
837 return -ENOMEM;
838 ctrldesc->pins = pindesc;
839 ctrldesc->npins = drvdata->nr_pins;
840
841 /* dynamically populate the pin number and pin name for pindesc */
842 for (pin = 0, pdesc = pindesc; pin < ctrldesc->npins; pin++, pdesc++)
843 pdesc->number = pin + drvdata->pin_base;
844
845 /*
846 * allocate space for storing the dynamically generated names for all
847 * the pins which belong to this pin-controller.
848 */
849 pin_names = devm_kzalloc(&pdev->dev, sizeof(char) * PIN_NAME_LENGTH *
850 drvdata->nr_pins, GFP_KERNEL);
851 if (!pin_names)
852 return -ENOMEM;
853
854 /* for each pin, the name of the pin is pin-bank name + pin number */
855 for (bank = 0; bank < drvdata->nr_banks; bank++) {
856 pin_bank = &drvdata->pin_banks[bank];
857 for (pin = 0; pin < pin_bank->nr_pins; pin++) {
858 sprintf(pin_names, "%s-%d", pin_bank->name, pin);
859 pdesc = pindesc + pin_bank->pin_base + pin;
860 pdesc->name = pin_names;
861 pin_names += PIN_NAME_LENGTH;
862 }
863 }
864
865 ret = samsung_pinctrl_parse_dt(pdev, drvdata);
866 if (ret)
867 return ret;
868
869 drvdata->pctl_dev = devm_pinctrl_register(&pdev->dev, ctrldesc,
870 drvdata);
871 if (IS_ERR(drvdata->pctl_dev)) {
872 dev_err(&pdev->dev, "could not register pinctrl driver\n");
873 return PTR_ERR(drvdata->pctl_dev);
874 }
875
876 for (bank = 0; bank < drvdata->nr_banks; ++bank) {
877 pin_bank = &drvdata->pin_banks[bank];
878 pin_bank->grange.name = pin_bank->name;
879 pin_bank->grange.id = bank;
880 pin_bank->grange.pin_base = drvdata->pin_base
881 + pin_bank->pin_base;
882 pin_bank->grange.base = pin_bank->grange.pin_base;
883 pin_bank->grange.npins = pin_bank->gpio_chip.ngpio;
884 pin_bank->grange.gc = &pin_bank->gpio_chip;
885 pinctrl_add_gpio_range(drvdata->pctl_dev, &pin_bank->grange);
886 }
887
888 return 0;
889 }
890
891 /* unregister the pinctrl interface with the pinctrl subsystem */
892 static int samsung_pinctrl_unregister(struct platform_device *pdev,
893 struct samsung_pinctrl_drv_data *drvdata)
894 {
895 struct samsung_pin_bank *bank = drvdata->pin_banks;
896 int i;
897
898 for (i = 0; i < drvdata->nr_banks; ++i, ++bank)
899 pinctrl_remove_gpio_range(drvdata->pctl_dev, &bank->grange);
900
901 return 0;
902 }
903
904 static const struct gpio_chip samsung_gpiolib_chip = {
905 .request = gpiochip_generic_request,
906 .free = gpiochip_generic_free,
907 .set = samsung_gpio_set,
908 .get = samsung_gpio_get,
909 .direction_input = samsung_gpio_direction_input,
910 .direction_output = samsung_gpio_direction_output,
911 .to_irq = samsung_gpio_to_irq,
912 .owner = THIS_MODULE,
913 };
914
915 /* register the gpiolib interface with the gpiolib subsystem */
916 static int samsung_gpiolib_register(struct platform_device *pdev,
917 struct samsung_pinctrl_drv_data *drvdata)
918 {
919 struct samsung_pin_bank *bank = drvdata->pin_banks;
920 struct gpio_chip *gc;
921 int ret;
922 int i;
923
924 for (i = 0; i < drvdata->nr_banks; ++i, ++bank) {
925 bank->gpio_chip = samsung_gpiolib_chip;
926
927 gc = &bank->gpio_chip;
928 gc->base = bank->grange.base;
929 gc->ngpio = bank->nr_pins;
930 gc->parent = &pdev->dev;
931 gc->of_node = bank->of_node;
932 gc->label = bank->name;
933
934 ret = devm_gpiochip_add_data(&pdev->dev, gc, bank);
935 if (ret) {
936 dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
937 gc->label, ret);
938 return ret;
939 }
940 }
941
942 return 0;
943 }
944
945 static const struct samsung_pin_ctrl *
946 samsung_pinctrl_get_soc_data_for_of_alias(struct platform_device *pdev)
947 {
948 struct device_node *node = pdev->dev.of_node;
949 const struct samsung_pinctrl_of_match_data *of_data;
950 int id;
951
952 id = of_alias_get_id(node, "pinctrl");
953 if (id < 0) {
954 dev_err(&pdev->dev, "failed to get alias id\n");
955 return NULL;
956 }
957
958 of_data = of_device_get_match_data(&pdev->dev);
959 if (id >= of_data->num_ctrl) {
960 dev_err(&pdev->dev, "invalid alias id %d\n", id);
961 return NULL;
962 }
963
964 return &(of_data->ctrl[id]);
965 }
966
967 /* retrieve the soc specific data */
968 static const struct samsung_pin_ctrl *
969 samsung_pinctrl_get_soc_data(struct samsung_pinctrl_drv_data *d,
970 struct platform_device *pdev)
971 {
972 struct device_node *node = pdev->dev.of_node;
973 struct device_node *np;
974 const struct samsung_pin_bank_data *bdata;
975 const struct samsung_pin_ctrl *ctrl;
976 struct samsung_pin_bank *bank;
977 struct resource *res;
978 void __iomem *virt_base[SAMSUNG_PINCTRL_NUM_RESOURCES];
979 unsigned int i;
980
981 ctrl = samsung_pinctrl_get_soc_data_for_of_alias(pdev);
982 if (!ctrl)
983 return ERR_PTR(-ENOENT);
984
985 d->suspend = ctrl->suspend;
986 d->resume = ctrl->resume;
987 d->nr_banks = ctrl->nr_banks;
988 d->pin_banks = devm_kcalloc(&pdev->dev, d->nr_banks,
989 sizeof(*d->pin_banks), GFP_KERNEL);
990 if (!d->pin_banks)
991 return ERR_PTR(-ENOMEM);
992
993 if (ctrl->nr_ext_resources + 1 > SAMSUNG_PINCTRL_NUM_RESOURCES)
994 return ERR_PTR(-EINVAL);
995
996 for (i = 0; i < ctrl->nr_ext_resources + 1; i++) {
997 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
998 if (!res) {
999 dev_err(&pdev->dev, "failed to get mem%d resource\n", i);
1000 return ERR_PTR(-EINVAL);
1001 }
1002 virt_base[i] = devm_ioremap(&pdev->dev, res->start,
1003 resource_size(res));
1004 if (!virt_base[i]) {
1005 dev_err(&pdev->dev, "failed to ioremap %pR\n", res);
1006 return ERR_PTR(-EIO);
1007 }
1008 }
1009
1010 bank = d->pin_banks;
1011 bdata = ctrl->pin_banks;
1012 for (i = 0; i < ctrl->nr_banks; ++i, ++bdata, ++bank) {
1013 bank->type = bdata->type;
1014 bank->pctl_offset = bdata->pctl_offset;
1015 bank->nr_pins = bdata->nr_pins;
1016 bank->eint_func = bdata->eint_func;
1017 bank->eint_type = bdata->eint_type;
1018 bank->eint_mask = bdata->eint_mask;
1019 bank->eint_offset = bdata->eint_offset;
1020 bank->name = bdata->name;
1021
1022 spin_lock_init(&bank->slock);
1023 bank->drvdata = d;
1024 bank->pin_base = d->nr_pins;
1025 d->nr_pins += bank->nr_pins;
1026
1027 bank->eint_base = virt_base[0];
1028 bank->pctl_base = virt_base[bdata->pctl_res_idx];
1029 }
1030 /*
1031 * Legacy platforms should provide only one resource with IO memory.
1032 * Store it as virt_base because legacy driver needs to access it
1033 * through samsung_pinctrl_drv_data.
1034 */
1035 d->virt_base = virt_base[0];
1036
1037 for_each_child_of_node(node, np) {
1038 if (!of_find_property(np, "gpio-controller", NULL))
1039 continue;
1040 bank = d->pin_banks;
1041 for (i = 0; i < d->nr_banks; ++i, ++bank) {
1042 if (!strcmp(bank->name, np->name)) {
1043 bank->of_node = np;
1044 break;
1045 }
1046 }
1047 }
1048
1049 d->pin_base = pin_base;
1050 pin_base += d->nr_pins;
1051
1052 return ctrl;
1053 }
1054
1055 static int samsung_pinctrl_probe(struct platform_device *pdev)
1056 {
1057 struct samsung_pinctrl_drv_data *drvdata;
1058 const struct samsung_pin_ctrl *ctrl;
1059 struct device *dev = &pdev->dev;
1060 struct resource *res;
1061 int ret;
1062
1063 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
1064 if (!drvdata)
1065 return -ENOMEM;
1066
1067 ctrl = samsung_pinctrl_get_soc_data(drvdata, pdev);
1068 if (IS_ERR(ctrl)) {
1069 dev_err(&pdev->dev, "driver data not available\n");
1070 return PTR_ERR(ctrl);
1071 }
1072 drvdata->dev = dev;
1073
1074 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1075 if (res)
1076 drvdata->irq = res->start;
1077
1078 if (ctrl->retention_data) {
1079 drvdata->retention_ctrl = ctrl->retention_data->init(drvdata,
1080 ctrl->retention_data);
1081 if (IS_ERR(drvdata->retention_ctrl))
1082 return PTR_ERR(drvdata->retention_ctrl);
1083 }
1084
1085 ret = samsung_pinctrl_register(pdev, drvdata);
1086 if (ret)
1087 return ret;
1088
1089 ret = samsung_gpiolib_register(pdev, drvdata);
1090 if (ret) {
1091 samsung_pinctrl_unregister(pdev, drvdata);
1092 return ret;
1093 }
1094
1095 if (ctrl->eint_gpio_init)
1096 ctrl->eint_gpio_init(drvdata);
1097 if (ctrl->eint_wkup_init)
1098 ctrl->eint_wkup_init(drvdata);
1099
1100 platform_set_drvdata(pdev, drvdata);
1101
1102 return 0;
1103 }
1104
1105 /**
1106 * samsung_pinctrl_suspend - save pinctrl state for suspend
1107 *
1108 * Save data for all banks handled by this device.
1109 */
1110 static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
1111 {
1112 struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
1113 int i;
1114
1115 for (i = 0; i < drvdata->nr_banks; i++) {
1116 struct samsung_pin_bank *bank = &drvdata->pin_banks[i];
1117 void __iomem *reg = bank->pctl_base + bank->pctl_offset;
1118 const u8 *offs = bank->type->reg_offset;
1119 const u8 *widths = bank->type->fld_width;
1120 enum pincfg_type type;
1121
1122 /* Registers without a powerdown config aren't lost */
1123 if (!widths[PINCFG_TYPE_CON_PDN])
1124 continue;
1125
1126 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1127 if (widths[type])
1128 bank->pm_save[type] = readl(reg + offs[type]);
1129
1130 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1131 /* Some banks have two config registers */
1132 bank->pm_save[PINCFG_TYPE_NUM] =
1133 readl(reg + offs[PINCFG_TYPE_FUNC] + 4);
1134 pr_debug("Save %s @ %p (con %#010x %08x)\n",
1135 bank->name, reg,
1136 bank->pm_save[PINCFG_TYPE_FUNC],
1137 bank->pm_save[PINCFG_TYPE_NUM]);
1138 } else {
1139 pr_debug("Save %s @ %p (con %#010x)\n", bank->name,
1140 reg, bank->pm_save[PINCFG_TYPE_FUNC]);
1141 }
1142 }
1143
1144 if (drvdata->suspend)
1145 drvdata->suspend(drvdata);
1146 if (drvdata->retention_ctrl && drvdata->retention_ctrl->enable)
1147 drvdata->retention_ctrl->enable(drvdata);
1148
1149 return 0;
1150 }
1151
1152 /**
1153 * samsung_pinctrl_resume - restore pinctrl state from suspend
1154 *
1155 * Restore one of the banks that was saved during suspend.
1156 *
1157 * We don't bother doing anything complicated to avoid glitching lines since
1158 * we're called before pad retention is turned off.
1159 */
1160 static int __maybe_unused samsung_pinctrl_resume(struct device *dev)
1161 {
1162 struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
1163 int i;
1164
1165 if (drvdata->resume)
1166 drvdata->resume(drvdata);
1167
1168 for (i = 0; i < drvdata->nr_banks; i++) {
1169 struct samsung_pin_bank *bank = &drvdata->pin_banks[i];
1170 void __iomem *reg = bank->pctl_base + bank->pctl_offset;
1171 const u8 *offs = bank->type->reg_offset;
1172 const u8 *widths = bank->type->fld_width;
1173 enum pincfg_type type;
1174
1175 /* Registers without a powerdown config aren't lost */
1176 if (!widths[PINCFG_TYPE_CON_PDN])
1177 continue;
1178
1179 if (widths[PINCFG_TYPE_FUNC] * bank->nr_pins > 32) {
1180 /* Some banks have two config registers */
1181 pr_debug("%s @ %p (con %#010x %08x => %#010x %08x)\n",
1182 bank->name, reg,
1183 readl(reg + offs[PINCFG_TYPE_FUNC]),
1184 readl(reg + offs[PINCFG_TYPE_FUNC] + 4),
1185 bank->pm_save[PINCFG_TYPE_FUNC],
1186 bank->pm_save[PINCFG_TYPE_NUM]);
1187 writel(bank->pm_save[PINCFG_TYPE_NUM],
1188 reg + offs[PINCFG_TYPE_FUNC] + 4);
1189 } else {
1190 pr_debug("%s @ %p (con %#010x => %#010x)\n", bank->name,
1191 reg, readl(reg + offs[PINCFG_TYPE_FUNC]),
1192 bank->pm_save[PINCFG_TYPE_FUNC]);
1193 }
1194 for (type = 0; type < PINCFG_TYPE_NUM; type++)
1195 if (widths[type])
1196 writel(bank->pm_save[type], reg + offs[type]);
1197 }
1198
1199 if (drvdata->retention_ctrl && drvdata->retention_ctrl->disable)
1200 drvdata->retention_ctrl->disable(drvdata);
1201
1202 return 0;
1203 }
1204
1205 static const struct of_device_id samsung_pinctrl_dt_match[] = {
1206 #ifdef CONFIG_PINCTRL_EXYNOS_ARM
1207 { .compatible = "samsung,exynos3250-pinctrl",
1208 .data = &exynos3250_of_data },
1209 { .compatible = "samsung,exynos4210-pinctrl",
1210 .data = &exynos4210_of_data },
1211 { .compatible = "samsung,exynos4x12-pinctrl",
1212 .data = &exynos4x12_of_data },
1213 { .compatible = "samsung,exynos5250-pinctrl",
1214 .data = &exynos5250_of_data },
1215 { .compatible = "samsung,exynos5260-pinctrl",
1216 .data = &exynos5260_of_data },
1217 { .compatible = "samsung,exynos5410-pinctrl",
1218 .data = &exynos5410_of_data },
1219 { .compatible = "samsung,exynos5420-pinctrl",
1220 .data = &exynos5420_of_data },
1221 { .compatible = "samsung,s5pv210-pinctrl",
1222 .data = &s5pv210_of_data },
1223 #endif
1224 #ifdef CONFIG_PINCTRL_EXYNOS_ARM64
1225 { .compatible = "samsung,exynos5433-pinctrl",
1226 .data = &exynos5433_of_data },
1227 { .compatible = "samsung,exynos7-pinctrl",
1228 .data = &exynos7_of_data },
1229 #endif
1230 #ifdef CONFIG_PINCTRL_S3C64XX
1231 { .compatible = "samsung,s3c64xx-pinctrl",
1232 .data = &s3c64xx_of_data },
1233 #endif
1234 #ifdef CONFIG_PINCTRL_S3C24XX
1235 { .compatible = "samsung,s3c2412-pinctrl",
1236 .data = &s3c2412_of_data },
1237 { .compatible = "samsung,s3c2416-pinctrl",
1238 .data = &s3c2416_of_data },
1239 { .compatible = "samsung,s3c2440-pinctrl",
1240 .data = &s3c2440_of_data },
1241 { .compatible = "samsung,s3c2450-pinctrl",
1242 .data = &s3c2450_of_data },
1243 #endif
1244 {},
1245 };
1246
1247 static const struct dev_pm_ops samsung_pinctrl_pm_ops = {
1248 SET_LATE_SYSTEM_SLEEP_PM_OPS(samsung_pinctrl_suspend,
1249 samsung_pinctrl_resume)
1250 };
1251
1252 static struct platform_driver samsung_pinctrl_driver = {
1253 .probe = samsung_pinctrl_probe,
1254 .driver = {
1255 .name = "samsung-pinctrl",
1256 .of_match_table = samsung_pinctrl_dt_match,
1257 .suppress_bind_attrs = true,
1258 .pm = &samsung_pinctrl_pm_ops,
1259 },
1260 };
1261
1262 static int __init samsung_pinctrl_drv_register(void)
1263 {
1264 return platform_driver_register(&samsung_pinctrl_driver);
1265 }
1266 postcore_initcall(samsung_pinctrl_drv_register);
Linux with added FPC-III support