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[linux.git] / drivers / pinctrl / nxp / pinctrl-s32cc.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Core driver for the S32 CC (Common Chassis) pin controller
4  *
5  * Copyright 2017-2022 NXP
6  * Copyright (C) 2022 SUSE LLC
7  * Copyright 2015-2016 Freescale Semiconductor, Inc.
8  */
9
10 #include <linux/bitops.h>
11 #include <linux/err.h>
12 #include <linux/gpio/driver.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/pinctrl/machine.h>
19 #include <linux/pinctrl/pinconf.h>
20 #include <linux/pinctrl/pinctrl.h>
21 #include <linux/pinctrl/pinmux.h>
22 #include <linux/regmap.h>
23 #include <linux/seq_file.h>
24 #include <linux/slab.h>
25
26 #include "../core.h"
27 #include "../pinconf.h"
28 #include "../pinctrl-utils.h"
29 #include "pinctrl-s32.h"
30
31 #define S32_PIN_ID_SHIFT        4
32 #define S32_PIN_ID_MASK         GENMASK(31, S32_PIN_ID_SHIFT)
33
34 #define S32_MSCR_SSS_MASK       GENMASK(2, 0)
35 #define S32_MSCR_PUS            BIT(12)
36 #define S32_MSCR_PUE            BIT(13)
37 #define S32_MSCR_SRE(X)         (((X) & GENMASK(3, 0)) << 14)
38 #define S32_MSCR_IBE            BIT(19)
39 #define S32_MSCR_ODE            BIT(20)
40 #define S32_MSCR_OBE            BIT(21)
41
42 static struct regmap_config s32_regmap_config = {
43         .reg_bits = 32,
44         .val_bits = 32,
45         .reg_stride = 4,
46 };
47
48 static u32 get_pin_no(u32 pinmux)
49 {
50         return (pinmux & S32_PIN_ID_MASK) >> S32_PIN_ID_SHIFT;
51 }
52
53 static u32 get_pin_func(u32 pinmux)
54 {
55         return pinmux & GENMASK(3, 0);
56 }
57
58 struct s32_pinctrl_mem_region {
59         struct regmap *map;
60         const struct s32_pin_range *pin_range;
61         char name[8];
62 };
63
64 /*
65  * Holds pin configuration for GPIO's.
66  * @pin_id: Pin ID for this GPIO
67  * @config: Pin settings
68  * @list: Linked list entry for each gpio pin
69  */
70 struct gpio_pin_config {
71         unsigned int pin_id;
72         unsigned int config;
73         struct list_head list;
74 };
75
76 /*
77  * Pad config save/restore for power suspend/resume.
78  */
79 struct s32_pinctrl_context {
80         unsigned int *pads;
81 };
82
83 /*
84  * @dev: a pointer back to containing device
85  * @pctl: a pointer to the pinctrl device structure
86  * @regions: reserved memory regions with start/end pin
87  * @info: structure containing information about the pin
88  * @gpio_configs: Saved configurations for GPIO pins
89  * @gpiop_configs_lock: lock for the `gpio_configs` list
90  * @s32_pinctrl_context: Configuration saved over system sleep
91  */
92 struct s32_pinctrl {
93         struct device *dev;
94         struct pinctrl_dev *pctl;
95         struct s32_pinctrl_mem_region *regions;
96         struct s32_pinctrl_soc_info *info;
97         struct list_head gpio_configs;
98         spinlock_t gpio_configs_lock;
99 #ifdef CONFIG_PM_SLEEP
100         struct s32_pinctrl_context saved_context;
101 #endif
102 };
103
104 static struct s32_pinctrl_mem_region *
105 s32_get_region(struct pinctrl_dev *pctldev, unsigned int pin)
106 {
107         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
108         const struct s32_pin_range *pin_range;
109         unsigned int mem_regions = ipctl->info->soc_data->mem_regions;
110         unsigned int i;
111
112         for (i = 0; i < mem_regions; i++) {
113                 pin_range = ipctl->regions[i].pin_range;
114                 if (pin >= pin_range->start && pin <= pin_range->end)
115                         return &ipctl->regions[i];
116         }
117
118         return NULL;
119 }
120
121 static inline int s32_check_pin(struct pinctrl_dev *pctldev,
122                                 unsigned int pin)
123 {
124         return s32_get_region(pctldev, pin) ? 0 : -EINVAL;
125 }
126
127 static inline int s32_regmap_read(struct pinctrl_dev *pctldev,
128                            unsigned int pin, unsigned int *val)
129 {
130         struct s32_pinctrl_mem_region *region;
131         unsigned int offset;
132
133         region = s32_get_region(pctldev, pin);
134         if (!region)
135                 return -EINVAL;
136
137         offset = (pin - region->pin_range->start) *
138                         regmap_get_reg_stride(region->map);
139
140         return regmap_read(region->map, offset, val);
141 }
142
143 static inline int s32_regmap_write(struct pinctrl_dev *pctldev,
144                             unsigned int pin,
145                             unsigned int val)
146 {
147         struct s32_pinctrl_mem_region *region;
148         unsigned int offset;
149
150         region = s32_get_region(pctldev, pin);
151         if (!region)
152                 return -EINVAL;
153
154         offset = (pin - region->pin_range->start) *
155                         regmap_get_reg_stride(region->map);
156
157         return regmap_write(region->map, offset, val);
158
159 }
160
161 static inline int s32_regmap_update(struct pinctrl_dev *pctldev, unsigned int pin,
162                              unsigned int mask, unsigned int val)
163 {
164         struct s32_pinctrl_mem_region *region;
165         unsigned int offset;
166
167         region = s32_get_region(pctldev, pin);
168         if (!region)
169                 return -EINVAL;
170
171         offset = (pin - region->pin_range->start) *
172                         regmap_get_reg_stride(region->map);
173
174         return regmap_update_bits(region->map, offset, mask, val);
175 }
176
177 static int s32_get_groups_count(struct pinctrl_dev *pctldev)
178 {
179         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
180         const struct s32_pinctrl_soc_info *info = ipctl->info;
181
182         return info->ngroups;
183 }
184
185 static const char *s32_get_group_name(struct pinctrl_dev *pctldev,
186                                       unsigned int selector)
187 {
188         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
189         const struct s32_pinctrl_soc_info *info = ipctl->info;
190
191         return info->groups[selector].data.name;
192 }
193
194 static int s32_get_group_pins(struct pinctrl_dev *pctldev,
195                               unsigned int selector, const unsigned int **pins,
196                               unsigned int *npins)
197 {
198         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
199         const struct s32_pinctrl_soc_info *info = ipctl->info;
200
201         *pins = info->groups[selector].data.pins;
202         *npins = info->groups[selector].data.npins;
203
204         return 0;
205 }
206
207 static void s32_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
208                              unsigned int offset)
209 {
210         seq_printf(s, "%s", dev_name(pctldev->dev));
211 }
212
213 static int s32_dt_group_node_to_map(struct pinctrl_dev *pctldev,
214                                     struct device_node *np,
215                                     struct pinctrl_map **map,
216                                     unsigned int *reserved_maps,
217                                     unsigned int *num_maps,
218                                     const char *func_name)
219 {
220         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
221         struct device *dev = ipctl->dev;
222         unsigned long *cfgs = NULL;
223         unsigned int n_cfgs, reserve = 1;
224         int n_pins, ret;
225
226         n_pins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32));
227         if (n_pins < 0) {
228                 dev_warn(dev, "Can't find 'pinmux' property in node %pOFn\n", np);
229         } else if (!n_pins) {
230                 return -EINVAL;
231         }
232
233         ret = pinconf_generic_parse_dt_config(np, pctldev, &cfgs, &n_cfgs);
234         if (ret) {
235                 dev_err(dev, "%pOF: could not parse node property\n", np);
236                 return ret;
237         }
238
239         if (n_cfgs)
240                 reserve++;
241
242         ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
243                                         reserve);
244         if (ret < 0)
245                 goto free_cfgs;
246
247         ret = pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
248                                         np->name, func_name);
249         if (ret < 0)
250                 goto free_cfgs;
251
252         if (n_cfgs) {
253                 ret = pinctrl_utils_add_map_configs(pctldev, map, reserved_maps,
254                                                     num_maps, np->name, cfgs, n_cfgs,
255                                                     PIN_MAP_TYPE_CONFIGS_GROUP);
256                 if (ret < 0)
257                         goto free_cfgs;
258         }
259
260 free_cfgs:
261         kfree(cfgs);
262         return ret;
263 }
264
265 static int s32_dt_node_to_map(struct pinctrl_dev *pctldev,
266                               struct device_node *np_config,
267                               struct pinctrl_map **map,
268                               unsigned int *num_maps)
269 {
270         unsigned int reserved_maps;
271         int ret;
272
273         reserved_maps = 0;
274         *map = NULL;
275         *num_maps = 0;
276
277         for_each_available_child_of_node_scoped(np_config, np) {
278                 ret = s32_dt_group_node_to_map(pctldev, np, map,
279                                                &reserved_maps, num_maps,
280                                                np_config->name);
281                 if (ret < 0) {
282                         pinctrl_utils_free_map(pctldev, *map, *num_maps);
283                         return ret;
284                 }
285         }
286
287         return 0;
288 }
289
290 static const struct pinctrl_ops s32_pctrl_ops = {
291         .get_groups_count = s32_get_groups_count,
292         .get_group_name = s32_get_group_name,
293         .get_group_pins = s32_get_group_pins,
294         .pin_dbg_show = s32_pin_dbg_show,
295         .dt_node_to_map = s32_dt_node_to_map,
296         .dt_free_map = pinctrl_utils_free_map,
297 };
298
299 static int s32_pmx_set(struct pinctrl_dev *pctldev, unsigned int selector,
300                        unsigned int group)
301 {
302         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
303         const struct s32_pinctrl_soc_info *info = ipctl->info;
304         int i, ret;
305         struct s32_pin_group *grp;
306
307         /*
308          * Configure the mux mode for each pin in the group for a specific
309          * function.
310          */
311         grp = &info->groups[group];
312
313         dev_dbg(ipctl->dev, "set mux for function %s group %s\n",
314                 info->functions[selector].name, grp->data.name);
315
316         /* Check beforehand so we don't have a partial config. */
317         for (i = 0; i < grp->data.npins; i++) {
318                 if (s32_check_pin(pctldev, grp->data.pins[i]) != 0) {
319                         dev_err(info->dev, "invalid pin: %u in group: %u\n",
320                                 grp->data.pins[i], group);
321                         return -EINVAL;
322                 }
323         }
324
325         for (i = 0, ret = 0; i < grp->data.npins && !ret; i++) {
326                 ret = s32_regmap_update(pctldev, grp->data.pins[i],
327                                         S32_MSCR_SSS_MASK, grp->pin_sss[i]);
328                 if (ret) {
329                         dev_err(info->dev, "Failed to set pin %u\n",
330                                 grp->data.pins[i]);
331                         return ret;
332                 }
333         }
334
335         return 0;
336 }
337
338 static int s32_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
339 {
340         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
341         const struct s32_pinctrl_soc_info *info = ipctl->info;
342
343         return info->nfunctions;
344 }
345
346 static const char *s32_pmx_get_func_name(struct pinctrl_dev *pctldev,
347                                          unsigned int selector)
348 {
349         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
350         const struct s32_pinctrl_soc_info *info = ipctl->info;
351
352         return info->functions[selector].name;
353 }
354
355 static int s32_pmx_get_groups(struct pinctrl_dev *pctldev,
356                               unsigned int selector,
357                               const char * const **groups,
358                               unsigned int * const num_groups)
359 {
360         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
361         const struct s32_pinctrl_soc_info *info = ipctl->info;
362
363         *groups = info->functions[selector].groups;
364         *num_groups = info->functions[selector].ngroups;
365
366         return 0;
367 }
368
369 static int s32_pmx_gpio_request_enable(struct pinctrl_dev *pctldev,
370                                        struct pinctrl_gpio_range *range,
371                                        unsigned int offset)
372 {
373         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
374         struct gpio_pin_config *gpio_pin;
375         unsigned int config;
376         unsigned long flags;
377         int ret;
378
379         ret = s32_regmap_read(pctldev, offset, &config);
380         if (ret)
381                 return ret;
382
383         /* Save current configuration */
384         gpio_pin = kmalloc(sizeof(*gpio_pin), GFP_KERNEL);
385         if (!gpio_pin)
386                 return -ENOMEM;
387
388         gpio_pin->pin_id = offset;
389         gpio_pin->config = config;
390
391         spin_lock_irqsave(&ipctl->gpio_configs_lock, flags);
392         list_add(&gpio_pin->list, &ipctl->gpio_configs);
393         spin_unlock_irqrestore(&ipctl->gpio_configs_lock, flags);
394
395         /* GPIO pin means SSS = 0 */
396         config &= ~S32_MSCR_SSS_MASK;
397
398         return s32_regmap_write(pctldev, offset, config);
399 }
400
401 static void s32_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
402                                       struct pinctrl_gpio_range *range,
403                                       unsigned int offset)
404 {
405         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
406         struct gpio_pin_config *gpio_pin, *tmp;
407         unsigned long flags;
408         int ret;
409
410         spin_lock_irqsave(&ipctl->gpio_configs_lock, flags);
411
412         list_for_each_entry_safe(gpio_pin, tmp, &ipctl->gpio_configs, list) {
413                 if (gpio_pin->pin_id == offset) {
414                         ret = s32_regmap_write(pctldev, gpio_pin->pin_id,
415                                                  gpio_pin->config);
416                         if (ret != 0)
417                                 goto unlock;
418
419                         list_del(&gpio_pin->list);
420                         kfree(gpio_pin);
421                         break;
422                 }
423         }
424
425 unlock:
426         spin_unlock_irqrestore(&ipctl->gpio_configs_lock, flags);
427 }
428
429 static int s32_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
430                                       struct pinctrl_gpio_range *range,
431                                       unsigned int offset,
432                                       bool input)
433 {
434         unsigned int config;
435         unsigned int mask = S32_MSCR_IBE | S32_MSCR_OBE;
436
437         if (input) {
438                 /* Disable output buffer and enable input buffer */
439                 config = S32_MSCR_IBE;
440         } else {
441                 /* Disable input buffer and enable output buffer */
442                 config = S32_MSCR_OBE;
443         }
444
445         return s32_regmap_update(pctldev, offset, mask, config);
446 }
447
448 static const struct pinmux_ops s32_pmx_ops = {
449         .get_functions_count = s32_pmx_get_funcs_count,
450         .get_function_name = s32_pmx_get_func_name,
451         .get_function_groups = s32_pmx_get_groups,
452         .set_mux = s32_pmx_set,
453         .gpio_request_enable = s32_pmx_gpio_request_enable,
454         .gpio_disable_free = s32_pmx_gpio_disable_free,
455         .gpio_set_direction = s32_pmx_gpio_set_direction,
456 };
457
458 /* Set the reserved elements as -1 */
459 static const int support_slew[] = {208, -1, -1, -1, 166, 150, 133, 83};
460
461 static int s32_get_slew_regval(int arg)
462 {
463         unsigned int i;
464
465         /* Translate a real slew rate (MHz) to a register value */
466         for (i = 0; i < ARRAY_SIZE(support_slew); i++) {
467                 if (arg == support_slew[i])
468                         return i;
469         }
470
471         return -EINVAL;
472 }
473
474 static inline void s32_pin_set_pull(enum pin_config_param param,
475                                    unsigned int *mask, unsigned int *config)
476 {
477         switch (param) {
478         case PIN_CONFIG_BIAS_DISABLE:
479         case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
480                 *config &= ~(S32_MSCR_PUS | S32_MSCR_PUE);
481                 break;
482         case PIN_CONFIG_BIAS_PULL_UP:
483                 *config |= S32_MSCR_PUS | S32_MSCR_PUE;
484                 break;
485         case PIN_CONFIG_BIAS_PULL_DOWN:
486                 *config &= ~S32_MSCR_PUS;
487                 *config |= S32_MSCR_PUE;
488                 break;
489         default:
490                 return;
491         }
492
493         *mask |= S32_MSCR_PUS | S32_MSCR_PUE;
494 }
495
496 static int s32_parse_pincfg(unsigned long pincfg, unsigned int *mask,
497                             unsigned int *config)
498 {
499         enum pin_config_param param;
500         u32 arg;
501         int ret;
502
503         param = pinconf_to_config_param(pincfg);
504         arg = pinconf_to_config_argument(pincfg);
505
506         switch (param) {
507         /* All pins are persistent over suspend */
508         case PIN_CONFIG_PERSIST_STATE:
509                 return 0;
510         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
511                 *config |= S32_MSCR_ODE;
512                 *mask |= S32_MSCR_ODE;
513                 break;
514         case PIN_CONFIG_OUTPUT_ENABLE:
515                 if (arg)
516                         *config |= S32_MSCR_OBE;
517                 else
518                         *config &= ~S32_MSCR_OBE;
519                 *mask |= S32_MSCR_OBE;
520                 break;
521         case PIN_CONFIG_INPUT_ENABLE:
522                 if (arg)
523                         *config |= S32_MSCR_IBE;
524                 else
525                         *config &= ~S32_MSCR_IBE;
526                 *mask |= S32_MSCR_IBE;
527                 break;
528         case PIN_CONFIG_SLEW_RATE:
529                 ret = s32_get_slew_regval(arg);
530                 if (ret < 0)
531                         return ret;
532                 *config |= S32_MSCR_SRE((u32)ret);
533                 *mask |= S32_MSCR_SRE(~0);
534                 break;
535         case PIN_CONFIG_BIAS_DISABLE:
536         case PIN_CONFIG_BIAS_PULL_UP:
537         case PIN_CONFIG_BIAS_PULL_DOWN:
538                 s32_pin_set_pull(param, mask, config);
539                 break;
540         case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
541                 *config &= ~(S32_MSCR_ODE | S32_MSCR_OBE | S32_MSCR_IBE);
542                 *mask |= S32_MSCR_ODE | S32_MSCR_OBE | S32_MSCR_IBE;
543                 s32_pin_set_pull(param, mask, config);
544                 break;
545         default:
546                 return -EOPNOTSUPP;
547         }
548
549         return 0;
550 }
551
552 static int s32_pinconf_mscr_update(struct pinctrl_dev *pctldev,
553                                    unsigned int pin_id,
554                                    unsigned long *configs,
555                                    unsigned int num_configs)
556 {
557         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
558         unsigned int config = 0, mask = 0;
559         int i, ret;
560
561         ret = s32_check_pin(pctldev, pin_id);
562         if (ret)
563                 return ret;
564
565         dev_dbg(ipctl->dev, "pinconf set pin %s with %u configs\n",
566                 pin_get_name(pctldev, pin_id), num_configs);
567
568         for (i = 0; i < num_configs; i++) {
569                 ret = s32_parse_pincfg(configs[i], &mask, &config);
570                 if (ret)
571                         return ret;
572         }
573
574         if (!config && !mask)
575                 return 0;
576
577         dev_dbg(ipctl->dev, "update: pin %u cfg 0x%x\n", pin_id, config);
578
579         return s32_regmap_update(pctldev, pin_id, mask, config);
580 }
581
582 static int s32_pinconf_get(struct pinctrl_dev *pctldev,
583                            unsigned int pin_id,
584                            unsigned long *config)
585 {
586         return s32_regmap_read(pctldev, pin_id, (unsigned int *)config);
587 }
588
589 static int s32_pinconf_set(struct pinctrl_dev *pctldev,
590                            unsigned int pin_id, unsigned long *configs,
591                            unsigned int num_configs)
592 {
593         return s32_pinconf_mscr_update(pctldev, pin_id, configs,
594                                        num_configs);
595 }
596
597 static int s32_pconf_group_set(struct pinctrl_dev *pctldev, unsigned int selector,
598                                unsigned long *configs, unsigned int num_configs)
599 {
600         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
601         const struct s32_pinctrl_soc_info *info = ipctl->info;
602         struct s32_pin_group *grp;
603         int i, ret;
604
605         grp = &info->groups[selector];
606         for (i = 0; i < grp->data.npins; i++) {
607                 ret = s32_pinconf_mscr_update(pctldev, grp->data.pins[i],
608                                               configs, num_configs);
609                 if (ret)
610                         return ret;
611         }
612
613         return 0;
614 }
615
616 static void s32_pinconf_dbg_show(struct pinctrl_dev *pctldev,
617                                  struct seq_file *s, unsigned int pin_id)
618 {
619         unsigned int config;
620         int ret;
621
622         ret = s32_regmap_read(pctldev, pin_id, &config);
623         if (ret)
624                 return;
625
626         seq_printf(s, "0x%x", config);
627 }
628
629 static void s32_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
630                                        struct seq_file *s, unsigned int selector)
631 {
632         struct s32_pinctrl *ipctl = pinctrl_dev_get_drvdata(pctldev);
633         const struct s32_pinctrl_soc_info *info = ipctl->info;
634         struct s32_pin_group *grp;
635         unsigned int config;
636         const char *name;
637         int i, ret;
638
639         seq_puts(s, "\n");
640         grp = &info->groups[selector];
641         for (i = 0; i < grp->data.npins; i++) {
642                 name = pin_get_name(pctldev, grp->data.pins[i]);
643                 ret = s32_regmap_read(pctldev, grp->data.pins[i], &config);
644                 if (ret)
645                         return;
646                 seq_printf(s, "%s: 0x%x\n", name, config);
647         }
648 }
649
650 static const struct pinconf_ops s32_pinconf_ops = {
651         .pin_config_get = s32_pinconf_get,
652         .pin_config_set = s32_pinconf_set,
653         .pin_config_group_set = s32_pconf_group_set,
654         .pin_config_dbg_show = s32_pinconf_dbg_show,
655         .pin_config_group_dbg_show = s32_pinconf_group_dbg_show,
656 };
657
658 #ifdef CONFIG_PM_SLEEP
659 static bool s32_pinctrl_should_save(struct s32_pinctrl *ipctl,
660                                     unsigned int pin)
661 {
662         const struct pin_desc *pd = pin_desc_get(ipctl->pctl, pin);
663
664         if (!pd)
665                 return false;
666
667         /*
668          * Only restore the pin if it is actually in use by the kernel (or
669          * by userspace).
670          */
671         if (pd->mux_owner || pd->gpio_owner)
672                 return true;
673
674         return false;
675 }
676
677 int s32_pinctrl_suspend(struct device *dev)
678 {
679         struct platform_device *pdev = to_platform_device(dev);
680         struct s32_pinctrl *ipctl = platform_get_drvdata(pdev);
681         const struct pinctrl_pin_desc *pin;
682         const struct s32_pinctrl_soc_info *info = ipctl->info;
683         struct s32_pinctrl_context *saved_context = &ipctl->saved_context;
684         int i;
685         int ret;
686         unsigned int config;
687
688         for (i = 0; i < info->soc_data->npins; i++) {
689                 pin = &info->soc_data->pins[i];
690
691                 if (!s32_pinctrl_should_save(ipctl, pin->number))
692                         continue;
693
694                 ret = s32_regmap_read(ipctl->pctl, pin->number, &config);
695                 if (ret)
696                         return -EINVAL;
697
698                 saved_context->pads[i] = config;
699         }
700
701         return 0;
702 }
703
704 int s32_pinctrl_resume(struct device *dev)
705 {
706         struct platform_device *pdev = to_platform_device(dev);
707         struct s32_pinctrl *ipctl = platform_get_drvdata(pdev);
708         const struct s32_pinctrl_soc_info *info = ipctl->info;
709         const struct pinctrl_pin_desc *pin;
710         struct s32_pinctrl_context *saved_context = &ipctl->saved_context;
711         int ret, i;
712
713         for (i = 0; i < info->soc_data->npins; i++) {
714                 pin = &info->soc_data->pins[i];
715
716                 if (!s32_pinctrl_should_save(ipctl, pin->number))
717                         continue;
718
719                 ret = s32_regmap_write(ipctl->pctl, pin->number,
720                                          saved_context->pads[i]);
721                 if (ret)
722                         return ret;
723         }
724
725         return 0;
726 }
727 #endif
728
729 static int s32_pinctrl_parse_groups(struct device_node *np,
730                                      struct s32_pin_group *grp,
731                                      struct s32_pinctrl_soc_info *info)
732 {
733         struct device *dev;
734         unsigned int *pins, *sss;
735         int i, npins;
736         u32 pinmux;
737
738         dev = info->dev;
739
740         dev_dbg(dev, "group: %pOFn\n", np);
741
742         /* Initialise group */
743         grp->data.name = np->name;
744
745         npins = of_property_count_elems_of_size(np, "pinmux", sizeof(u32));
746         if (npins < 0) {
747                 dev_err(dev, "Failed to read 'pinmux' property in node %s.\n",
748                         grp->data.name);
749                 return -EINVAL;
750         }
751         if (!npins) {
752                 dev_err(dev, "The group %s has no pins.\n", grp->data.name);
753                 return -EINVAL;
754         }
755
756         grp->data.npins = npins;
757
758         pins = devm_kcalloc(info->dev, npins, sizeof(*pins), GFP_KERNEL);
759         sss = devm_kcalloc(info->dev, npins, sizeof(*sss), GFP_KERNEL);
760         if (!pins || !sss)
761                 return -ENOMEM;
762
763         i = 0;
764         of_property_for_each_u32(np, "pinmux", pinmux) {
765                 pins[i] = get_pin_no(pinmux);
766                 sss[i] = get_pin_func(pinmux);
767
768                 dev_dbg(info->dev, "pin: 0x%x, sss: 0x%x", pins[i], sss[i]);
769                 i++;
770         }
771
772         grp->data.pins = pins;
773         grp->pin_sss = sss;
774
775         return 0;
776 }
777
778 static int s32_pinctrl_parse_functions(struct device_node *np,
779                                         struct s32_pinctrl_soc_info *info,
780                                         u32 index)
781 {
782         struct pinfunction *func;
783         struct s32_pin_group *grp;
784         const char **groups;
785         u32 i = 0;
786         int ret = 0;
787
788         dev_dbg(info->dev, "parse function(%u): %pOFn\n", index, np);
789
790         func = &info->functions[index];
791
792         /* Initialise function */
793         func->name = np->name;
794         func->ngroups = of_get_child_count(np);
795         if (func->ngroups == 0) {
796                 dev_err(info->dev, "no groups defined in %pOF\n", np);
797                 return -EINVAL;
798         }
799
800         groups = devm_kcalloc(info->dev, func->ngroups,
801                                     sizeof(*func->groups), GFP_KERNEL);
802         if (!groups)
803                 return -ENOMEM;
804
805         for_each_child_of_node_scoped(np, child) {
806                 groups[i] = child->name;
807                 grp = &info->groups[info->grp_index++];
808                 ret = s32_pinctrl_parse_groups(child, grp, info);
809                 if (ret)
810                         return ret;
811                 i++;
812         }
813
814         func->groups = groups;
815
816         return 0;
817 }
818
819 static int s32_pinctrl_probe_dt(struct platform_device *pdev,
820                                 struct s32_pinctrl *ipctl)
821 {
822         struct s32_pinctrl_soc_info *info = ipctl->info;
823         struct device_node *np = pdev->dev.of_node;
824         struct resource *res;
825         struct regmap *map;
826         void __iomem *base;
827         unsigned int mem_regions = info->soc_data->mem_regions;
828         int ret;
829         u32 nfuncs = 0;
830         u32 i = 0;
831
832         if (!np)
833                 return -ENODEV;
834
835         if (mem_regions == 0 || mem_regions >= 10000) {
836                 dev_err(&pdev->dev, "mem_regions is invalid: %u\n", mem_regions);
837                 return -EINVAL;
838         }
839
840         ipctl->regions = devm_kcalloc(&pdev->dev, mem_regions,
841                                       sizeof(*ipctl->regions), GFP_KERNEL);
842         if (!ipctl->regions)
843                 return -ENOMEM;
844
845         for (i = 0; i < mem_regions; i++) {
846                 base = devm_platform_get_and_ioremap_resource(pdev, i, &res);
847                 if (IS_ERR(base))
848                         return PTR_ERR(base);
849
850                 snprintf(ipctl->regions[i].name,
851                          sizeof(ipctl->regions[i].name), "map%u", i);
852
853                 s32_regmap_config.name = ipctl->regions[i].name;
854                 s32_regmap_config.max_register = resource_size(res) -
855                                                  s32_regmap_config.reg_stride;
856
857                 map = devm_regmap_init_mmio(&pdev->dev, base,
858                                                 &s32_regmap_config);
859                 if (IS_ERR(map)) {
860                         dev_err(&pdev->dev, "Failed to init regmap[%u]\n", i);
861                         return PTR_ERR(map);
862                 }
863
864                 ipctl->regions[i].map = map;
865                 ipctl->regions[i].pin_range = &info->soc_data->mem_pin_ranges[i];
866         }
867
868         nfuncs = of_get_child_count(np);
869         if (nfuncs <= 0) {
870                 dev_err(&pdev->dev, "no functions defined\n");
871                 return -EINVAL;
872         }
873
874         info->nfunctions = nfuncs;
875         info->functions = devm_kcalloc(&pdev->dev, nfuncs,
876                                        sizeof(*info->functions), GFP_KERNEL);
877         if (!info->functions)
878                 return -ENOMEM;
879
880         info->ngroups = 0;
881         for_each_child_of_node_scoped(np, child)
882                 info->ngroups += of_get_child_count(child);
883
884         info->groups = devm_kcalloc(&pdev->dev, info->ngroups,
885                                     sizeof(*info->groups), GFP_KERNEL);
886         if (!info->groups)
887                 return -ENOMEM;
888
889         i = 0;
890         for_each_child_of_node_scoped(np, child) {
891                 ret = s32_pinctrl_parse_functions(child, info, i++);
892                 if (ret)
893                         return ret;
894         }
895
896         return 0;
897 }
898
899 int s32_pinctrl_probe(struct platform_device *pdev,
900                       const struct s32_pinctrl_soc_data *soc_data)
901 {
902         struct s32_pinctrl *ipctl;
903         int ret;
904         struct pinctrl_desc *s32_pinctrl_desc;
905         struct s32_pinctrl_soc_info *info;
906 #ifdef CONFIG_PM_SLEEP
907         struct s32_pinctrl_context *saved_context;
908 #endif
909
910         if (!soc_data || !soc_data->pins || !soc_data->npins) {
911                 dev_err(&pdev->dev, "wrong pinctrl info\n");
912                 return -EINVAL;
913         }
914
915         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
916         if (!info)
917                 return -ENOMEM;
918
919         info->soc_data = soc_data;
920         info->dev = &pdev->dev;
921
922         /* Create state holders etc for this driver */
923         ipctl = devm_kzalloc(&pdev->dev, sizeof(*ipctl), GFP_KERNEL);
924         if (!ipctl)
925                 return -ENOMEM;
926
927         ipctl->info = info;
928         ipctl->dev = info->dev;
929         platform_set_drvdata(pdev, ipctl);
930
931         INIT_LIST_HEAD(&ipctl->gpio_configs);
932         spin_lock_init(&ipctl->gpio_configs_lock);
933
934         s32_pinctrl_desc =
935                 devm_kmalloc(&pdev->dev, sizeof(*s32_pinctrl_desc), GFP_KERNEL);
936         if (!s32_pinctrl_desc)
937                 return -ENOMEM;
938
939         s32_pinctrl_desc->name = dev_name(&pdev->dev);
940         s32_pinctrl_desc->pins = info->soc_data->pins;
941         s32_pinctrl_desc->npins = info->soc_data->npins;
942         s32_pinctrl_desc->pctlops = &s32_pctrl_ops;
943         s32_pinctrl_desc->pmxops = &s32_pmx_ops;
944         s32_pinctrl_desc->confops = &s32_pinconf_ops;
945         s32_pinctrl_desc->owner = THIS_MODULE;
946
947         ret = s32_pinctrl_probe_dt(pdev, ipctl);
948         if (ret) {
949                 dev_err(&pdev->dev, "fail to probe dt properties\n");
950                 return ret;
951         }
952
953         ipctl->pctl = devm_pinctrl_register(&pdev->dev, s32_pinctrl_desc,
954                                             ipctl);
955         if (IS_ERR(ipctl->pctl))
956                 return dev_err_probe(&pdev->dev, PTR_ERR(ipctl->pctl),
957                                      "could not register s32 pinctrl driver\n");
958
959 #ifdef CONFIG_PM_SLEEP
960         saved_context = &ipctl->saved_context;
961         saved_context->pads =
962                 devm_kcalloc(&pdev->dev, info->soc_data->npins,
963                              sizeof(*saved_context->pads),
964                              GFP_KERNEL);
965         if (!saved_context->pads)
966                 return -ENOMEM;
967 #endif
968
969         dev_info(&pdev->dev, "initialized s32 pinctrl driver\n");
970
971         return 0;
972 }
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