This source file includes following definitions.
- wmt_setbits
- wmt_clearbits
- wmt_pmx_get_functions_count
- wmt_pmx_get_function_name
- wmt_pmx_get_function_groups
- wmt_set_pinmux
- wmt_pmx_set_mux
- wmt_pmx_gpio_disable_free
- wmt_pmx_gpio_set_direction
- wmt_get_groups_count
- wmt_get_group_name
- wmt_get_group_pins
- wmt_pctl_find_group_by_pin
- wmt_pctl_dt_node_to_map_func
- wmt_pctl_dt_node_to_map_pull
- wmt_pctl_dt_free_map
- wmt_pctl_dt_node_to_map
- wmt_pinconf_get
- wmt_pinconf_set
- wmt_gpio_get_direction
- wmt_gpio_get_value
- wmt_gpio_set_value
- wmt_gpio_direction_input
- wmt_gpio_direction_output
- wmt_pinctrl_probe
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8 #include <linux/err.h>
9 #include <linux/gpio/driver.h>
10 #include <linux/interrupt.h>
11 #include <linux/io.h>
12 #include <linux/irq.h>
13 #include <linux/of.h>
14 #include <linux/of_irq.h>
15 #include <linux/pinctrl/consumer.h>
16 #include <linux/pinctrl/machine.h>
17 #include <linux/pinctrl/pinconf.h>
18 #include <linux/pinctrl/pinconf-generic.h>
19 #include <linux/pinctrl/pinctrl.h>
20 #include <linux/pinctrl/pinmux.h>
21 #include <linux/platform_device.h>
22 #include <linux/slab.h>
23
24 #include "pinctrl-wmt.h"
25
26 static inline void wmt_setbits(struct wmt_pinctrl_data *data, u32 reg,
27 u32 mask)
28 {
29 u32 val;
30
31 val = readl_relaxed(data->base + reg);
32 val |= mask;
33 writel_relaxed(val, data->base + reg);
34 }
35
36 static inline void wmt_clearbits(struct wmt_pinctrl_data *data, u32 reg,
37 u32 mask)
38 {
39 u32 val;
40
41 val = readl_relaxed(data->base + reg);
42 val &= ~mask;
43 writel_relaxed(val, data->base + reg);
44 }
45
46 enum wmt_func_sel {
47 WMT_FSEL_GPIO_IN = 0,
48 WMT_FSEL_GPIO_OUT = 1,
49 WMT_FSEL_ALT = 2,
50 WMT_FSEL_COUNT = 3,
51 };
52
53 static const char * const wmt_functions[WMT_FSEL_COUNT] = {
54 [WMT_FSEL_GPIO_IN] = "gpio_in",
55 [WMT_FSEL_GPIO_OUT] = "gpio_out",
56 [WMT_FSEL_ALT] = "alt",
57 };
58
59 static int wmt_pmx_get_functions_count(struct pinctrl_dev *pctldev)
60 {
61 return WMT_FSEL_COUNT;
62 }
63
64 static const char *wmt_pmx_get_function_name(struct pinctrl_dev *pctldev,
65 unsigned selector)
66 {
67 return wmt_functions[selector];
68 }
69
70 static int wmt_pmx_get_function_groups(struct pinctrl_dev *pctldev,
71 unsigned selector,
72 const char * const **groups,
73 unsigned * const num_groups)
74 {
75 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
76
77
78 *groups = data->groups;
79 *num_groups = data->ngroups;
80
81 return 0;
82 }
83
84 static int wmt_set_pinmux(struct wmt_pinctrl_data *data, unsigned func,
85 unsigned pin)
86 {
87 u32 bank = WMT_BANK_FROM_PIN(pin);
88 u32 bit = WMT_BIT_FROM_PIN(pin);
89 u32 reg_en = data->banks[bank].reg_en;
90 u32 reg_dir = data->banks[bank].reg_dir;
91
92 if (reg_dir == NO_REG) {
93 dev_err(data->dev, "pin:%d no direction register defined\n",
94 pin);
95 return -EINVAL;
96 }
97
98
99
100
101
102 switch (func) {
103 case WMT_FSEL_GPIO_IN:
104 if (reg_en != NO_REG)
105 wmt_setbits(data, reg_en, BIT(bit));
106 wmt_clearbits(data, reg_dir, BIT(bit));
107 break;
108 case WMT_FSEL_GPIO_OUT:
109 if (reg_en != NO_REG)
110 wmt_setbits(data, reg_en, BIT(bit));
111 wmt_setbits(data, reg_dir, BIT(bit));
112 break;
113 case WMT_FSEL_ALT:
114 if (reg_en == NO_REG) {
115 dev_err(data->dev, "pin:%d no alt function available\n",
116 pin);
117 return -EINVAL;
118 }
119 wmt_clearbits(data, reg_en, BIT(bit));
120 }
121
122 return 0;
123 }
124
125 static int wmt_pmx_set_mux(struct pinctrl_dev *pctldev,
126 unsigned func_selector,
127 unsigned group_selector)
128 {
129 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
130 u32 pinnum = data->pins[group_selector].number;
131
132 return wmt_set_pinmux(data, func_selector, pinnum);
133 }
134
135 static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev,
136 struct pinctrl_gpio_range *range,
137 unsigned offset)
138 {
139 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
140
141
142 wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset);
143 }
144
145 static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
146 struct pinctrl_gpio_range *range,
147 unsigned offset,
148 bool input)
149 {
150 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
151
152 wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT),
153 offset);
154
155 return 0;
156 }
157
158 static const struct pinmux_ops wmt_pinmux_ops = {
159 .get_functions_count = wmt_pmx_get_functions_count,
160 .get_function_name = wmt_pmx_get_function_name,
161 .get_function_groups = wmt_pmx_get_function_groups,
162 .set_mux = wmt_pmx_set_mux,
163 .gpio_disable_free = wmt_pmx_gpio_disable_free,
164 .gpio_set_direction = wmt_pmx_gpio_set_direction,
165 };
166
167 static int wmt_get_groups_count(struct pinctrl_dev *pctldev)
168 {
169 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
170
171 return data->ngroups;
172 }
173
174 static const char *wmt_get_group_name(struct pinctrl_dev *pctldev,
175 unsigned selector)
176 {
177 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
178
179 return data->groups[selector];
180 }
181
182 static int wmt_get_group_pins(struct pinctrl_dev *pctldev,
183 unsigned selector,
184 const unsigned **pins,
185 unsigned *num_pins)
186 {
187 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
188
189 *pins = &data->pins[selector].number;
190 *num_pins = 1;
191
192 return 0;
193 }
194
195 static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin)
196 {
197 int i;
198
199 for (i = 0; i < data->npins; i++) {
200 if (data->pins[i].number == pin)
201 return i;
202 }
203
204 return -EINVAL;
205 }
206
207 static int wmt_pctl_dt_node_to_map_func(struct wmt_pinctrl_data *data,
208 struct device_node *np,
209 u32 pin, u32 fnum,
210 struct pinctrl_map **maps)
211 {
212 int group;
213 struct pinctrl_map *map = *maps;
214
215 if (fnum >= ARRAY_SIZE(wmt_functions)) {
216 dev_err(data->dev, "invalid wm,function %d\n", fnum);
217 return -EINVAL;
218 }
219
220 group = wmt_pctl_find_group_by_pin(data, pin);
221 if (group < 0) {
222 dev_err(data->dev, "unable to match pin %d to group\n", pin);
223 return group;
224 }
225
226 map->type = PIN_MAP_TYPE_MUX_GROUP;
227 map->data.mux.group = data->groups[group];
228 map->data.mux.function = wmt_functions[fnum];
229 (*maps)++;
230
231 return 0;
232 }
233
234 static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data,
235 struct device_node *np,
236 u32 pin, u32 pull,
237 struct pinctrl_map **maps)
238 {
239 int group;
240 unsigned long *configs;
241 struct pinctrl_map *map = *maps;
242
243 if (pull > 2) {
244 dev_err(data->dev, "invalid wm,pull %d\n", pull);
245 return -EINVAL;
246 }
247
248 group = wmt_pctl_find_group_by_pin(data, pin);
249 if (group < 0) {
250 dev_err(data->dev, "unable to match pin %d to group\n", pin);
251 return group;
252 }
253
254 configs = kzalloc(sizeof(*configs), GFP_KERNEL);
255 if (!configs)
256 return -ENOMEM;
257
258 switch (pull) {
259 case 0:
260 configs[0] = PIN_CONFIG_BIAS_DISABLE;
261 break;
262 case 1:
263 configs[0] = PIN_CONFIG_BIAS_PULL_DOWN;
264 break;
265 case 2:
266 configs[0] = PIN_CONFIG_BIAS_PULL_UP;
267 break;
268 default:
269 configs[0] = PIN_CONFIG_BIAS_DISABLE;
270 dev_err(data->dev, "invalid pull state %d - disabling\n", pull);
271 }
272
273 map->type = PIN_MAP_TYPE_CONFIGS_PIN;
274 map->data.configs.group_or_pin = data->groups[group];
275 map->data.configs.configs = configs;
276 map->data.configs.num_configs = 1;
277 (*maps)++;
278
279 return 0;
280 }
281
282 static void wmt_pctl_dt_free_map(struct pinctrl_dev *pctldev,
283 struct pinctrl_map *maps,
284 unsigned num_maps)
285 {
286 int i;
287
288 for (i = 0; i < num_maps; i++)
289 if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN)
290 kfree(maps[i].data.configs.configs);
291
292 kfree(maps);
293 }
294
295 static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
296 struct device_node *np,
297 struct pinctrl_map **map,
298 unsigned *num_maps)
299 {
300 struct pinctrl_map *maps, *cur_map;
301 struct property *pins, *funcs, *pulls;
302 u32 pin, func, pull;
303 int num_pins, num_funcs, num_pulls, maps_per_pin;
304 int i, err;
305 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
306
307 pins = of_find_property(np, "wm,pins", NULL);
308 if (!pins) {
309 dev_err(data->dev, "missing wmt,pins property\n");
310 return -EINVAL;
311 }
312
313 funcs = of_find_property(np, "wm,function", NULL);
314 pulls = of_find_property(np, "wm,pull", NULL);
315
316 if (!funcs && !pulls) {
317 dev_err(data->dev, "neither wm,function nor wm,pull specified\n");
318 return -EINVAL;
319 }
320
321
322
323
324
325 num_pins = pins->length / sizeof(u32);
326 num_funcs = funcs ? (funcs->length / sizeof(u32)) : 0;
327 num_pulls = pulls ? (pulls->length / sizeof(u32)) : 0;
328
329 if (num_funcs > 1 && num_funcs != num_pins) {
330 dev_err(data->dev, "wm,function must have 1 or %d entries\n",
331 num_pins);
332 return -EINVAL;
333 }
334
335 if (num_pulls > 1 && num_pulls != num_pins) {
336 dev_err(data->dev, "wm,pull must have 1 or %d entries\n",
337 num_pins);
338 return -EINVAL;
339 }
340
341 maps_per_pin = 0;
342 if (num_funcs)
343 maps_per_pin++;
344 if (num_pulls)
345 maps_per_pin++;
346
347 cur_map = maps = kcalloc(num_pins * maps_per_pin, sizeof(*maps),
348 GFP_KERNEL);
349 if (!maps)
350 return -ENOMEM;
351
352 for (i = 0; i < num_pins; i++) {
353 err = of_property_read_u32_index(np, "wm,pins", i, &pin);
354 if (err)
355 goto fail;
356
357 if (pin >= (data->nbanks * 32)) {
358 dev_err(data->dev, "invalid wm,pins value\n");
359 err = -EINVAL;
360 goto fail;
361 }
362
363 if (num_funcs) {
364 err = of_property_read_u32_index(np, "wm,function",
365 (num_funcs > 1 ? i : 0), &func);
366 if (err)
367 goto fail;
368
369 err = wmt_pctl_dt_node_to_map_func(data, np, pin, func,
370 &cur_map);
371 if (err)
372 goto fail;
373 }
374
375 if (num_pulls) {
376 err = of_property_read_u32_index(np, "wm,pull",
377 (num_pulls > 1 ? i : 0), &pull);
378 if (err)
379 goto fail;
380
381 err = wmt_pctl_dt_node_to_map_pull(data, np, pin, pull,
382 &cur_map);
383 if (err)
384 goto fail;
385 }
386 }
387 *map = maps;
388 *num_maps = num_pins * maps_per_pin;
389 return 0;
390
391
392
393
394
395
396
397
398
399 fail:
400 wmt_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin);
401 return err;
402 }
403
404 static const struct pinctrl_ops wmt_pctl_ops = {
405 .get_groups_count = wmt_get_groups_count,
406 .get_group_name = wmt_get_group_name,
407 .get_group_pins = wmt_get_group_pins,
408 .dt_node_to_map = wmt_pctl_dt_node_to_map,
409 .dt_free_map = wmt_pctl_dt_free_map,
410 };
411
412 static int wmt_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin,
413 unsigned long *config)
414 {
415 return -ENOTSUPP;
416 }
417
418 static int wmt_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin,
419 unsigned long *configs, unsigned num_configs)
420 {
421 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev);
422 enum pin_config_param param;
423 u32 arg;
424 u32 bank = WMT_BANK_FROM_PIN(pin);
425 u32 bit = WMT_BIT_FROM_PIN(pin);
426 u32 reg_pull_en = data->banks[bank].reg_pull_en;
427 u32 reg_pull_cfg = data->banks[bank].reg_pull_cfg;
428 int i;
429
430 if ((reg_pull_en == NO_REG) || (reg_pull_cfg == NO_REG)) {
431 dev_err(data->dev, "bias functions not supported on pin %d\n",
432 pin);
433 return -EINVAL;
434 }
435
436 for (i = 0; i < num_configs; i++) {
437 param = pinconf_to_config_param(configs[i]);
438 arg = pinconf_to_config_argument(configs[i]);
439
440 if ((param == PIN_CONFIG_BIAS_PULL_DOWN) ||
441 (param == PIN_CONFIG_BIAS_PULL_UP)) {
442 if (arg == 0)
443 param = PIN_CONFIG_BIAS_DISABLE;
444 }
445
446 switch (param) {
447 case PIN_CONFIG_BIAS_DISABLE:
448 wmt_clearbits(data, reg_pull_en, BIT(bit));
449 break;
450 case PIN_CONFIG_BIAS_PULL_DOWN:
451 wmt_clearbits(data, reg_pull_cfg, BIT(bit));
452 wmt_setbits(data, reg_pull_en, BIT(bit));
453 break;
454 case PIN_CONFIG_BIAS_PULL_UP:
455 wmt_setbits(data, reg_pull_cfg, BIT(bit));
456 wmt_setbits(data, reg_pull_en, BIT(bit));
457 break;
458 default:
459 dev_err(data->dev, "unknown pinconf param\n");
460 return -EINVAL;
461 }
462 }
463
464 return 0;
465 }
466
467 static const struct pinconf_ops wmt_pinconf_ops = {
468 .pin_config_get = wmt_pinconf_get,
469 .pin_config_set = wmt_pinconf_set,
470 };
471
472 static struct pinctrl_desc wmt_desc = {
473 .owner = THIS_MODULE,
474 .name = "pinctrl-wmt",
475 .pctlops = &wmt_pctl_ops,
476 .pmxops = &wmt_pinmux_ops,
477 .confops = &wmt_pinconf_ops,
478 };
479
480 static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
481 {
482 struct wmt_pinctrl_data *data = gpiochip_get_data(chip);
483 u32 bank = WMT_BANK_FROM_PIN(offset);
484 u32 bit = WMT_BIT_FROM_PIN(offset);
485 u32 reg_dir = data->banks[bank].reg_dir;
486 u32 val;
487
488 val = readl_relaxed(data->base + reg_dir);
489
490 return !(val & BIT(bit));
491 }
492
493 static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset)
494 {
495 struct wmt_pinctrl_data *data = gpiochip_get_data(chip);
496 u32 bank = WMT_BANK_FROM_PIN(offset);
497 u32 bit = WMT_BIT_FROM_PIN(offset);
498 u32 reg_data_in = data->banks[bank].reg_data_in;
499
500 if (reg_data_in == NO_REG) {
501 dev_err(data->dev, "no data in register defined\n");
502 return -EINVAL;
503 }
504
505 return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit));
506 }
507
508 static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset,
509 int val)
510 {
511 struct wmt_pinctrl_data *data = gpiochip_get_data(chip);
512 u32 bank = WMT_BANK_FROM_PIN(offset);
513 u32 bit = WMT_BIT_FROM_PIN(offset);
514 u32 reg_data_out = data->banks[bank].reg_data_out;
515
516 if (reg_data_out == NO_REG) {
517 dev_err(data->dev, "no data out register defined\n");
518 return;
519 }
520
521 if (val)
522 wmt_setbits(data, reg_data_out, BIT(bit));
523 else
524 wmt_clearbits(data, reg_data_out, BIT(bit));
525 }
526
527 static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
528 {
529 return pinctrl_gpio_direction_input(chip->base + offset);
530 }
531
532 static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
533 int value)
534 {
535 wmt_gpio_set_value(chip, offset, value);
536 return pinctrl_gpio_direction_output(chip->base + offset);
537 }
538
539 static const struct gpio_chip wmt_gpio_chip = {
540 .label = "gpio-wmt",
541 .owner = THIS_MODULE,
542 .request = gpiochip_generic_request,
543 .free = gpiochip_generic_free,
544 .get_direction = wmt_gpio_get_direction,
545 .direction_input = wmt_gpio_direction_input,
546 .direction_output = wmt_gpio_direction_output,
547 .get = wmt_gpio_get_value,
548 .set = wmt_gpio_set_value,
549 .can_sleep = false,
550 };
551
552 int wmt_pinctrl_probe(struct platform_device *pdev,
553 struct wmt_pinctrl_data *data)
554 {
555 int err;
556 struct resource *res;
557
558 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
559 data->base = devm_ioremap_resource(&pdev->dev, res);
560 if (IS_ERR(data->base))
561 return PTR_ERR(data->base);
562
563 wmt_desc.pins = data->pins;
564 wmt_desc.npins = data->npins;
565
566 data->gpio_chip = wmt_gpio_chip;
567 data->gpio_chip.parent = &pdev->dev;
568 data->gpio_chip.of_node = pdev->dev.of_node;
569 data->gpio_chip.ngpio = data->nbanks * 32;
570
571 platform_set_drvdata(pdev, data);
572
573 data->dev = &pdev->dev;
574
575 data->pctl_dev = devm_pinctrl_register(&pdev->dev, &wmt_desc, data);
576 if (IS_ERR(data->pctl_dev)) {
577 dev_err(&pdev->dev, "Failed to register pinctrl\n");
578 return PTR_ERR(data->pctl_dev);
579 }
580
581 err = gpiochip_add_data(&data->gpio_chip, data);
582 if (err) {
583 dev_err(&pdev->dev, "could not add GPIO chip\n");
584 return err;
585 }
586
587 err = gpiochip_add_pin_range(&data->gpio_chip, dev_name(data->dev),
588 0, 0, data->nbanks * 32);
589 if (err)
590 goto fail_range;
591
592 dev_info(&pdev->dev, "Pin controller initialized\n");
593
594 return 0;
595
596 fail_range:
597 gpiochip_remove(&data->gpio_chip);
598 return err;
599 }