1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * MediaTek Pinctrl Paris Driver, which implement the vendor per-pin
4 * bindings for MediaTek SoC.
5 *
6 * Copyright (C) 2018 MediaTek Inc.
7 * Author: Sean Wang <sean.wang@mediatek.com>
8 * Zhiyong Tao <zhiyong.tao@mediatek.com>
9 * Hongzhou.Yang <hongzhou.yang@mediatek.com>
10 */
11
12 #include <linux/gpio/driver.h>
13 #include <linux/module.h>
14 #include <linux/seq_file.h>
15
16 #include <linux/pinctrl/consumer.h>
17
18 #include <dt-bindings/pinctrl/mt65xx.h>
19
20 #include "pinctrl-paris.h"
21
22 #define PINCTRL_PINCTRL_DEV KBUILD_MODNAME
23
24 /* Custom pinconf parameters */
25 #define MTK_PIN_CONFIG_TDSEL (PIN_CONFIG_END + 1)
26 #define MTK_PIN_CONFIG_RDSEL (PIN_CONFIG_END + 2)
27 #define MTK_PIN_CONFIG_PU_ADV (PIN_CONFIG_END + 3)
28 #define MTK_PIN_CONFIG_PD_ADV (PIN_CONFIG_END + 4)
29 #define MTK_PIN_CONFIG_DRV_ADV (PIN_CONFIG_END + 5)
30
31 static const struct pinconf_generic_params mtk_custom_bindings[] = {
32 {"mediatek,tdsel", MTK_PIN_CONFIG_TDSEL, 0},
33 {"mediatek,rdsel", MTK_PIN_CONFIG_RDSEL, 0},
34 {"mediatek,pull-up-adv", MTK_PIN_CONFIG_PU_ADV, 1},
35 {"mediatek,pull-down-adv", MTK_PIN_CONFIG_PD_ADV, 1},
36 {"mediatek,drive-strength-adv", MTK_PIN_CONFIG_DRV_ADV, 2},
37 };
38
39 #ifdef CONFIG_DEBUG_FS
40 static const struct pin_config_item mtk_conf_items[] = {
41 PCONFDUMP(MTK_PIN_CONFIG_TDSEL, "tdsel", NULL, true),
42 PCONFDUMP(MTK_PIN_CONFIG_RDSEL, "rdsel", NULL, true),
43 PCONFDUMP(MTK_PIN_CONFIG_PU_ADV, "pu-adv", NULL, true),
44 PCONFDUMP(MTK_PIN_CONFIG_PD_ADV, "pd-adv", NULL, true),
45 PCONFDUMP(MTK_PIN_CONFIG_DRV_ADV, "drive-strength-adv", NULL, true),
46 };
47 #endif
48
49 static const char * const mtk_gpio_functions[] = {
50 "func0", "func1", "func2", "func3",
51 "func4", "func5", "func6", "func7",
52 "func8", "func9", "func10", "func11",
53 "func12", "func13", "func14", "func15",
54 };
55
56 /*
57 * This section supports converting to/from custom MTK_PIN_CONFIG_DRV_ADV
58 * and standard PIN_CONFIG_DRIVE_STRENGTH_UA pin configs.
59 *
60 * The custom value encodes three hardware bits as follows:
61 *
62 * | Bits |
63 * | 2 (E1) | 1 (E0) | 0 (EN) | drive strength (uA)
64 * ------------------------------------------------
65 * | x | x | 0 | disabled, use standard drive strength
66 * -------------------------------------
67 * | 0 | 0 | 1 | 125 uA
68 * | 0 | 1 | 1 | 250 uA
69 * | 1 | 0 | 1 | 500 uA
70 * | 1 | 1 | 1 | 1000 uA
71 */
72 static const int mtk_drv_adv_uA[] = { 125, 250, 500, 1000 };
73
mtk_drv_adv_to_uA(int val)74 static int mtk_drv_adv_to_uA(int val)
75 {
76 /* This should never happen. */
77 if (WARN_ON_ONCE(val < 0 || val > 7))
78 return -EINVAL;
79
80 /* Bit 0 simply enables this hardware part */
81 if (!(val & BIT(0)))
82 return -EINVAL;
83
84 return mtk_drv_adv_uA[(val >> 1)];
85 }
86
mtk_drv_uA_to_adv(int val)87 static int mtk_drv_uA_to_adv(int val)
88 {
89 switch (val) {
90 case 125:
91 return 0x1;
92 case 250:
93 return 0x3;
94 case 500:
95 return 0x5;
96 case 1000:
97 return 0x7;
98 }
99
100 return -EINVAL;
101 }
102
mtk_pinmux_gpio_request_enable(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned int pin)103 static int mtk_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
104 struct pinctrl_gpio_range *range,
105 unsigned int pin)
106 {
107 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
108 const struct mtk_pin_desc *desc;
109
110 desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
111
112 return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE,
113 hw->soc->gpio_m);
114 }
115
mtk_pinmux_gpio_set_direction(struct pinctrl_dev * pctldev,struct pinctrl_gpio_range * range,unsigned int pin,bool input)116 static int mtk_pinmux_gpio_set_direction(struct pinctrl_dev *pctldev,
117 struct pinctrl_gpio_range *range,
118 unsigned int pin, bool input)
119 {
120 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
121 const struct mtk_pin_desc *desc;
122
123 desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
124
125 /* hardware would take 0 as input direction */
126 return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !input);
127 }
128
mtk_pinconf_get(struct pinctrl_dev * pctldev,unsigned int pin,unsigned long * config)129 static int mtk_pinconf_get(struct pinctrl_dev *pctldev,
130 unsigned int pin, unsigned long *config)
131 {
132 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
133 u32 param = pinconf_to_config_param(*config);
134 int pullup, reg, err = -ENOTSUPP, ret = 1;
135 const struct mtk_pin_desc *desc;
136
137 if (pin >= hw->soc->npins)
138 return -EINVAL;
139
140 desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
141
142 switch (param) {
143 case PIN_CONFIG_BIAS_DISABLE:
144 case PIN_CONFIG_BIAS_PULL_UP:
145 case PIN_CONFIG_BIAS_PULL_DOWN:
146 if (!hw->soc->bias_get_combo)
147 break;
148 err = hw->soc->bias_get_combo(hw, desc, &pullup, &ret);
149 if (err)
150 break;
151 if (ret == MTK_PUPD_SET_R1R0_00)
152 ret = MTK_DISABLE;
153 if (param == PIN_CONFIG_BIAS_DISABLE) {
154 if (ret != MTK_DISABLE)
155 err = -EINVAL;
156 } else if (param == PIN_CONFIG_BIAS_PULL_UP) {
157 if (!pullup || ret == MTK_DISABLE)
158 err = -EINVAL;
159 } else if (param == PIN_CONFIG_BIAS_PULL_DOWN) {
160 if (pullup || ret == MTK_DISABLE)
161 err = -EINVAL;
162 }
163 break;
164 case PIN_CONFIG_SLEW_RATE:
165 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SR, &ret);
166 break;
167 case PIN_CONFIG_INPUT_ENABLE:
168 case PIN_CONFIG_OUTPUT_ENABLE:
169 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
170 if (err)
171 break;
172 /* CONFIG Current direction return value
173 * ------------- ----------------- ----------------------
174 * OUTPUT_ENABLE output 1 (= HW value)
175 * input 0 (= HW value)
176 * INPUT_ENABLE output 0 (= reverse HW value)
177 * input 1 (= reverse HW value)
178 */
179 if (param == PIN_CONFIG_INPUT_ENABLE)
180 ret = !ret;
181
182 break;
183 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
184 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &ret);
185 if (err)
186 break;
187 /* return error when in output mode
188 * because schmitt trigger only work in input mode
189 */
190 if (ret) {
191 err = -EINVAL;
192 break;
193 }
194
195 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_SMT, &ret);
196 break;
197 case PIN_CONFIG_DRIVE_STRENGTH:
198 if (!hw->soc->drive_get)
199 break;
200
201 if (hw->soc->adv_drive_get) {
202 err = hw->soc->adv_drive_get(hw, desc, &ret);
203 if (!err) {
204 err = mtk_drv_adv_to_uA(ret);
205 if (err > 0) {
206 /* PIN_CONFIG_DRIVE_STRENGTH_UA used */
207 err = -EINVAL;
208 break;
209 }
210 }
211 }
212
213 err = hw->soc->drive_get(hw, desc, &ret);
214 break;
215 case PIN_CONFIG_DRIVE_STRENGTH_UA:
216 if (!hw->soc->adv_drive_get)
217 break;
218
219 err = hw->soc->adv_drive_get(hw, desc, &ret);
220 if (err)
221 break;
222 err = mtk_drv_adv_to_uA(ret);
223 if (err < 0)
224 break;
225
226 ret = err;
227 err = 0;
228 break;
229 case MTK_PIN_CONFIG_TDSEL:
230 case MTK_PIN_CONFIG_RDSEL:
231 reg = (param == MTK_PIN_CONFIG_TDSEL) ?
232 PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
233 err = mtk_hw_get_value(hw, desc, reg, &ret);
234 break;
235 case MTK_PIN_CONFIG_PU_ADV:
236 case MTK_PIN_CONFIG_PD_ADV:
237 if (!hw->soc->adv_pull_get)
238 break;
239 pullup = param == MTK_PIN_CONFIG_PU_ADV;
240 err = hw->soc->adv_pull_get(hw, desc, pullup, &ret);
241 break;
242 case MTK_PIN_CONFIG_DRV_ADV:
243 if (!hw->soc->adv_drive_get)
244 break;
245 err = hw->soc->adv_drive_get(hw, desc, &ret);
246 break;
247 }
248
249 if (!err)
250 *config = pinconf_to_config_packed(param, ret);
251
252 return err;
253 }
254
mtk_pinconf_set(struct pinctrl_dev * pctldev,unsigned int pin,enum pin_config_param param,u32 arg)255 static int mtk_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
256 enum pin_config_param param, u32 arg)
257 {
258 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
259 const struct mtk_pin_desc *desc;
260 int err = -ENOTSUPP;
261 u32 reg;
262
263 if (pin >= hw->soc->npins)
264 return -EINVAL;
265
266 desc = (const struct mtk_pin_desc *)&hw->soc->pins[pin];
267
268 switch ((u32)param) {
269 case PIN_CONFIG_BIAS_DISABLE:
270 if (!hw->soc->bias_set_combo)
271 break;
272 err = hw->soc->bias_set_combo(hw, desc, 0, MTK_DISABLE);
273 break;
274 case PIN_CONFIG_BIAS_PULL_UP:
275 if (!hw->soc->bias_set_combo)
276 break;
277 err = hw->soc->bias_set_combo(hw, desc, 1, arg);
278 break;
279 case PIN_CONFIG_BIAS_PULL_DOWN:
280 if (!hw->soc->bias_set_combo)
281 break;
282 err = hw->soc->bias_set_combo(hw, desc, 0, arg);
283 break;
284 case PIN_CONFIG_OUTPUT_ENABLE:
285 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT,
286 MTK_DISABLE);
287 /* Keep set direction to consider the case that a GPIO pin
288 * does not have SMT control
289 */
290 if (err != -ENOTSUPP)
291 break;
292
293 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
294 MTK_OUTPUT);
295 break;
296 case PIN_CONFIG_INPUT_ENABLE:
297 /* regard all non-zero value as enable */
298 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_IES, !!arg);
299 if (err)
300 break;
301
302 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
303 MTK_INPUT);
304 break;
305 case PIN_CONFIG_SLEW_RATE:
306 /* regard all non-zero value as enable */
307 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SR, !!arg);
308 break;
309 case PIN_CONFIG_OUTPUT:
310 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO,
311 arg);
312 if (err)
313 break;
314
315 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR,
316 MTK_OUTPUT);
317 break;
318 case PIN_CONFIG_INPUT_SCHMITT:
319 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
320 /* arg = 1: Input mode & SMT enable ;
321 * arg = 0: Output mode & SMT disable
322 */
323 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DIR, !arg);
324 if (err)
325 break;
326
327 err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_SMT, !!arg);
328 break;
329 case PIN_CONFIG_DRIVE_STRENGTH:
330 if (!hw->soc->drive_set)
331 break;
332 err = hw->soc->drive_set(hw, desc, arg);
333 break;
334 case PIN_CONFIG_DRIVE_STRENGTH_UA:
335 if (!hw->soc->adv_drive_set)
336 break;
337
338 err = mtk_drv_uA_to_adv(arg);
339 if (err < 0)
340 break;
341 err = hw->soc->adv_drive_set(hw, desc, err);
342 break;
343 case MTK_PIN_CONFIG_TDSEL:
344 case MTK_PIN_CONFIG_RDSEL:
345 reg = (param == MTK_PIN_CONFIG_TDSEL) ?
346 PINCTRL_PIN_REG_TDSEL : PINCTRL_PIN_REG_RDSEL;
347 err = mtk_hw_set_value(hw, desc, reg, arg);
348 break;
349 case MTK_PIN_CONFIG_PU_ADV:
350 case MTK_PIN_CONFIG_PD_ADV:
351 if (!hw->soc->adv_pull_set)
352 break;
353 err = hw->soc->adv_pull_set(hw, desc,
354 (param == MTK_PIN_CONFIG_PU_ADV),
355 arg);
356 break;
357 case MTK_PIN_CONFIG_DRV_ADV:
358 if (!hw->soc->adv_drive_set)
359 break;
360 err = hw->soc->adv_drive_set(hw, desc, arg);
361 break;
362 }
363
364 return err;
365 }
366
367 static struct mtk_pinctrl_group *
mtk_pctrl_find_group_by_pin(struct mtk_pinctrl * hw,u32 pin)368 mtk_pctrl_find_group_by_pin(struct mtk_pinctrl *hw, u32 pin)
369 {
370 int i;
371
372 for (i = 0; i < hw->soc->ngrps; i++) {
373 struct mtk_pinctrl_group *grp = hw->groups + i;
374
375 if (grp->pin == pin)
376 return grp;
377 }
378
379 return NULL;
380 }
381
382 static const struct mtk_func_desc *
mtk_pctrl_find_function_by_pin(struct mtk_pinctrl * hw,u32 pin_num,u32 fnum)383 mtk_pctrl_find_function_by_pin(struct mtk_pinctrl *hw, u32 pin_num, u32 fnum)
384 {
385 const struct mtk_pin_desc *pin = hw->soc->pins + pin_num;
386 const struct mtk_func_desc *func = pin->funcs;
387
388 while (func && func->name) {
389 if (func->muxval == fnum)
390 return func;
391 func++;
392 }
393
394 return NULL;
395 }
396
mtk_pctrl_is_function_valid(struct mtk_pinctrl * hw,u32 pin_num,u32 fnum)397 static bool mtk_pctrl_is_function_valid(struct mtk_pinctrl *hw, u32 pin_num,
398 u32 fnum)
399 {
400 int i;
401
402 for (i = 0; i < hw->soc->npins; i++) {
403 const struct mtk_pin_desc *pin = hw->soc->pins + i;
404
405 if (pin->number == pin_num) {
406 const struct mtk_func_desc *func = pin->funcs;
407
408 while (func && func->name) {
409 if (func->muxval == fnum)
410 return true;
411 func++;
412 }
413
414 break;
415 }
416 }
417
418 return false;
419 }
420
mtk_pctrl_dt_node_to_map_func(struct mtk_pinctrl * pctl,u32 pin,u32 fnum,struct mtk_pinctrl_group * grp,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps)421 static int mtk_pctrl_dt_node_to_map_func(struct mtk_pinctrl *pctl,
422 u32 pin, u32 fnum,
423 struct mtk_pinctrl_group *grp,
424 struct pinctrl_map **map,
425 unsigned *reserved_maps,
426 unsigned *num_maps)
427 {
428 bool ret;
429
430 if (*num_maps == *reserved_maps)
431 return -ENOSPC;
432
433 (*map)[*num_maps].type = PIN_MAP_TYPE_MUX_GROUP;
434 (*map)[*num_maps].data.mux.group = grp->name;
435
436 ret = mtk_pctrl_is_function_valid(pctl, pin, fnum);
437 if (!ret) {
438 dev_err(pctl->dev, "invalid function %d on pin %d .\n",
439 fnum, pin);
440 return -EINVAL;
441 }
442
443 (*map)[*num_maps].data.mux.function = mtk_gpio_functions[fnum];
444 (*num_maps)++;
445
446 return 0;
447 }
448
mtk_pctrl_dt_subnode_to_map(struct pinctrl_dev * pctldev,struct device_node * node,struct pinctrl_map ** map,unsigned * reserved_maps,unsigned * num_maps)449 static int mtk_pctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
450 struct device_node *node,
451 struct pinctrl_map **map,
452 unsigned *reserved_maps,
453 unsigned *num_maps)
454 {
455 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
456 int num_pins, num_funcs, maps_per_pin, i, err;
457 struct mtk_pinctrl_group *grp;
458 unsigned int num_configs;
459 bool has_config = false;
460 unsigned long *configs;
461 u32 pinfunc, pin, func;
462 struct property *pins;
463 unsigned reserve = 0;
464
465 pins = of_find_property(node, "pinmux", NULL);
466 if (!pins) {
467 dev_err(hw->dev, "missing pins property in node %pOFn .\n",
468 node);
469 return -EINVAL;
470 }
471
472 err = pinconf_generic_parse_dt_config(node, pctldev, &configs,
473 &num_configs);
474 if (err)
475 return err;
476
477 if (num_configs)
478 has_config = true;
479
480 num_pins = pins->length / sizeof(u32);
481 num_funcs = num_pins;
482 maps_per_pin = 0;
483 if (num_funcs)
484 maps_per_pin++;
485 if (has_config && num_pins >= 1)
486 maps_per_pin++;
487
488 if (!num_pins || !maps_per_pin) {
489 err = -EINVAL;
490 goto exit;
491 }
492
493 reserve = num_pins * maps_per_pin;
494
495 err = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
496 reserve);
497 if (err < 0)
498 goto exit;
499
500 for (i = 0; i < num_pins; i++) {
501 err = of_property_read_u32_index(node, "pinmux", i, &pinfunc);
502 if (err)
503 goto exit;
504
505 pin = MTK_GET_PIN_NO(pinfunc);
506 func = MTK_GET_PIN_FUNC(pinfunc);
507
508 if (pin >= hw->soc->npins ||
509 func >= ARRAY_SIZE(mtk_gpio_functions)) {
510 dev_err(hw->dev, "invalid pins value.\n");
511 err = -EINVAL;
512 goto exit;
513 }
514
515 grp = mtk_pctrl_find_group_by_pin(hw, pin);
516 if (!grp) {
517 dev_err(hw->dev, "unable to match pin %d to group\n",
518 pin);
519 err = -EINVAL;
520 goto exit;
521 }
522
523 err = mtk_pctrl_dt_node_to_map_func(hw, pin, func, grp, map,
524 reserved_maps, num_maps);
525 if (err < 0)
526 goto exit;
527
528 if (has_config) {
529 err = pinctrl_utils_add_map_configs(pctldev, map,
530 reserved_maps,
531 num_maps,
532 grp->name,
533 configs,
534 num_configs,
535 PIN_MAP_TYPE_CONFIGS_GROUP);
536 if (err < 0)
537 goto exit;
538 }
539 }
540
541 err = 0;
542
543 exit:
544 kfree(configs);
545 return err;
546 }
547
mtk_pctrl_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np_config,struct pinctrl_map ** map,unsigned * num_maps)548 static int mtk_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
549 struct device_node *np_config,
550 struct pinctrl_map **map,
551 unsigned *num_maps)
552 {
553 struct device_node *np;
554 unsigned reserved_maps;
555 int ret;
556
557 *map = NULL;
558 *num_maps = 0;
559 reserved_maps = 0;
560
561 for_each_child_of_node(np_config, np) {
562 ret = mtk_pctrl_dt_subnode_to_map(pctldev, np, map,
563 &reserved_maps,
564 num_maps);
565 if (ret < 0) {
566 pinctrl_utils_free_map(pctldev, *map, *num_maps);
567 of_node_put(np);
568 return ret;
569 }
570 }
571
572 return 0;
573 }
574
mtk_pctrl_get_groups_count(struct pinctrl_dev * pctldev)575 static int mtk_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
576 {
577 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
578
579 return hw->soc->ngrps;
580 }
581
mtk_pctrl_get_group_name(struct pinctrl_dev * pctldev,unsigned group)582 static const char *mtk_pctrl_get_group_name(struct pinctrl_dev *pctldev,
583 unsigned group)
584 {
585 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
586
587 return hw->groups[group].name;
588 }
589
mtk_pctrl_get_group_pins(struct pinctrl_dev * pctldev,unsigned group,const unsigned ** pins,unsigned * num_pins)590 static int mtk_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
591 unsigned group, const unsigned **pins,
592 unsigned *num_pins)
593 {
594 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
595
596 *pins = (unsigned *)&hw->groups[group].pin;
597 *num_pins = 1;
598
599 return 0;
600 }
601
mtk_hw_get_value_wrap(struct mtk_pinctrl * hw,unsigned int gpio,int field)602 static int mtk_hw_get_value_wrap(struct mtk_pinctrl *hw, unsigned int gpio, int field)
603 {
604 const struct mtk_pin_desc *desc;
605 int value, err;
606
607 if (gpio >= hw->soc->npins)
608 return -EINVAL;
609
610 desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
611
612 err = mtk_hw_get_value(hw, desc, field, &value);
613 if (err)
614 return err;
615
616 return value;
617 }
618
619 #define mtk_pctrl_get_pinmux(hw, gpio) \
620 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_MODE)
621
622 #define mtk_pctrl_get_direction(hw, gpio) \
623 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DIR)
624
625 #define mtk_pctrl_get_out(hw, gpio) \
626 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DO)
627
628 #define mtk_pctrl_get_in(hw, gpio) \
629 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DI)
630
631 #define mtk_pctrl_get_smt(hw, gpio) \
632 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_SMT)
633
634 #define mtk_pctrl_get_ies(hw, gpio) \
635 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_IES)
636
637 #define mtk_pctrl_get_driving(hw, gpio) \
638 mtk_hw_get_value_wrap(hw, gpio, PINCTRL_PIN_REG_DRV)
639
mtk_pctrl_show_one_pin(struct mtk_pinctrl * hw,unsigned int gpio,char * buf,unsigned int buf_len)640 ssize_t mtk_pctrl_show_one_pin(struct mtk_pinctrl *hw,
641 unsigned int gpio, char *buf, unsigned int buf_len)
642 {
643 int pinmux, pullup = 0, pullen = 0, len = 0, r1 = -1, r0 = -1, rsel = -1;
644 const struct mtk_pin_desc *desc;
645 u32 try_all_type = 0;
646
647 if (gpio >= hw->soc->npins)
648 return -EINVAL;
649
650 if (mtk_is_virt_gpio(hw, gpio))
651 return -EINVAL;
652
653 desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
654 pinmux = mtk_pctrl_get_pinmux(hw, gpio);
655 if (pinmux >= hw->soc->nfuncs)
656 pinmux -= hw->soc->nfuncs;
657
658 mtk_pinconf_bias_get_combo(hw, desc, &pullup, &pullen);
659
660 if (hw->soc->pull_type)
661 try_all_type = hw->soc->pull_type[desc->number];
662
663 if (hw->rsel_si_unit && (try_all_type & MTK_PULL_RSEL_TYPE)) {
664 rsel = pullen;
665 pullen = 1;
666 } else {
667 /* Case for: R1R0 */
668 if (pullen == MTK_PUPD_SET_R1R0_00) {
669 pullen = 0;
670 r1 = 0;
671 r0 = 0;
672 } else if (pullen == MTK_PUPD_SET_R1R0_01) {
673 pullen = 1;
674 r1 = 0;
675 r0 = 1;
676 } else if (pullen == MTK_PUPD_SET_R1R0_10) {
677 pullen = 1;
678 r1 = 1;
679 r0 = 0;
680 } else if (pullen == MTK_PUPD_SET_R1R0_11) {
681 pullen = 1;
682 r1 = 1;
683 r0 = 1;
684 }
685
686 /* Case for: RSEL */
687 if (pullen >= MTK_PULL_SET_RSEL_000 &&
688 pullen <= MTK_PULL_SET_RSEL_111) {
689 rsel = pullen - MTK_PULL_SET_RSEL_000;
690 pullen = 1;
691 }
692 }
693 len += scnprintf(buf + len, buf_len - len,
694 "%03d: %1d%1d%1d%1d%02d%1d%1d%1d%1d",
695 gpio,
696 pinmux,
697 mtk_pctrl_get_direction(hw, gpio),
698 mtk_pctrl_get_out(hw, gpio),
699 mtk_pctrl_get_in(hw, gpio),
700 mtk_pctrl_get_driving(hw, gpio),
701 mtk_pctrl_get_smt(hw, gpio),
702 mtk_pctrl_get_ies(hw, gpio),
703 pullen,
704 pullup);
705
706 if (r1 != -1)
707 len += scnprintf(buf + len, buf_len - len, " (%1d %1d)", r1, r0);
708 else if (rsel != -1)
709 len += scnprintf(buf + len, buf_len - len, " (%1d)", rsel);
710
711 return len;
712 }
713 EXPORT_SYMBOL_GPL(mtk_pctrl_show_one_pin);
714
715 #define PIN_DBG_BUF_SZ 96
mtk_pctrl_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned int gpio)716 static void mtk_pctrl_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
717 unsigned int gpio)
718 {
719 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
720 char buf[PIN_DBG_BUF_SZ] = { 0 };
721
722 (void)mtk_pctrl_show_one_pin(hw, gpio, buf, PIN_DBG_BUF_SZ);
723
724 seq_printf(s, "%s", buf);
725 }
726
727 static const struct pinctrl_ops mtk_pctlops = {
728 .dt_node_to_map = mtk_pctrl_dt_node_to_map,
729 .dt_free_map = pinctrl_utils_free_map,
730 .get_groups_count = mtk_pctrl_get_groups_count,
731 .get_group_name = mtk_pctrl_get_group_name,
732 .get_group_pins = mtk_pctrl_get_group_pins,
733 .pin_dbg_show = mtk_pctrl_dbg_show,
734 };
735
mtk_pmx_get_funcs_cnt(struct pinctrl_dev * pctldev)736 static int mtk_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
737 {
738 return ARRAY_SIZE(mtk_gpio_functions);
739 }
740
mtk_pmx_get_func_name(struct pinctrl_dev * pctldev,unsigned selector)741 static const char *mtk_pmx_get_func_name(struct pinctrl_dev *pctldev,
742 unsigned selector)
743 {
744 return mtk_gpio_functions[selector];
745 }
746
mtk_pmx_get_func_groups(struct pinctrl_dev * pctldev,unsigned function,const char * const ** groups,unsigned * const num_groups)747 static int mtk_pmx_get_func_groups(struct pinctrl_dev *pctldev,
748 unsigned function,
749 const char * const **groups,
750 unsigned * const num_groups)
751 {
752 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
753
754 *groups = hw->grp_names;
755 *num_groups = hw->soc->ngrps;
756
757 return 0;
758 }
759
mtk_pmx_set_mux(struct pinctrl_dev * pctldev,unsigned function,unsigned group)760 static int mtk_pmx_set_mux(struct pinctrl_dev *pctldev,
761 unsigned function,
762 unsigned group)
763 {
764 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
765 struct mtk_pinctrl_group *grp = hw->groups + group;
766 const struct mtk_func_desc *desc_func;
767 const struct mtk_pin_desc *desc;
768 bool ret;
769
770 ret = mtk_pctrl_is_function_valid(hw, grp->pin, function);
771 if (!ret) {
772 dev_err(hw->dev, "invalid function %d on group %d .\n",
773 function, group);
774 return -EINVAL;
775 }
776
777 desc_func = mtk_pctrl_find_function_by_pin(hw, grp->pin, function);
778 if (!desc_func)
779 return -EINVAL;
780
781 desc = (const struct mtk_pin_desc *)&hw->soc->pins[grp->pin];
782 return mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_MODE, desc_func->muxval);
783 }
784
785 static const struct pinmux_ops mtk_pmxops = {
786 .get_functions_count = mtk_pmx_get_funcs_cnt,
787 .get_function_name = mtk_pmx_get_func_name,
788 .get_function_groups = mtk_pmx_get_func_groups,
789 .set_mux = mtk_pmx_set_mux,
790 .gpio_set_direction = mtk_pinmux_gpio_set_direction,
791 .gpio_request_enable = mtk_pinmux_gpio_request_enable,
792 };
793
mtk_pconf_group_get(struct pinctrl_dev * pctldev,unsigned group,unsigned long * config)794 static int mtk_pconf_group_get(struct pinctrl_dev *pctldev, unsigned group,
795 unsigned long *config)
796 {
797 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
798 struct mtk_pinctrl_group *grp = &hw->groups[group];
799
800 /* One pin per group only */
801 return mtk_pinconf_get(pctldev, grp->pin, config);
802 }
803
mtk_pconf_group_set(struct pinctrl_dev * pctldev,unsigned group,unsigned long * configs,unsigned num_configs)804 static int mtk_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
805 unsigned long *configs, unsigned num_configs)
806 {
807 struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
808 struct mtk_pinctrl_group *grp = &hw->groups[group];
809 bool drive_strength_uA_found = false;
810 bool adv_drve_strength_found = false;
811 int i, ret;
812
813 for (i = 0; i < num_configs; i++) {
814 ret = mtk_pinconf_set(pctldev, grp->pin,
815 pinconf_to_config_param(configs[i]),
816 pinconf_to_config_argument(configs[i]));
817 if (ret < 0)
818 return ret;
819
820 if (pinconf_to_config_param(configs[i]) == PIN_CONFIG_DRIVE_STRENGTH_UA)
821 drive_strength_uA_found = true;
822 if (pinconf_to_config_param(configs[i]) == MTK_PIN_CONFIG_DRV_ADV)
823 adv_drve_strength_found = true;
824 }
825
826 /*
827 * Disable advanced drive strength mode if drive-strength-microamp
828 * is not set. However, mediatek,drive-strength-adv takes precedence
829 * as its value can explicitly request the mode be enabled or not.
830 */
831 if (hw->soc->adv_drive_set && !drive_strength_uA_found &&
832 !adv_drve_strength_found)
833 hw->soc->adv_drive_set(hw, &hw->soc->pins[grp->pin], 0);
834
835 return 0;
836 }
837
838 static const struct pinconf_ops mtk_confops = {
839 .pin_config_get = mtk_pinconf_get,
840 .pin_config_group_get = mtk_pconf_group_get,
841 .pin_config_group_set = mtk_pconf_group_set,
842 .is_generic = true,
843 };
844
845 static struct pinctrl_desc mtk_desc = {
846 .name = PINCTRL_PINCTRL_DEV,
847 .pctlops = &mtk_pctlops,
848 .pmxops = &mtk_pmxops,
849 .confops = &mtk_confops,
850 .owner = THIS_MODULE,
851 };
852
mtk_gpio_get_direction(struct gpio_chip * chip,unsigned int gpio)853 static int mtk_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio)
854 {
855 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
856 const struct mtk_pin_desc *desc;
857 int value, err;
858
859 if (gpio >= hw->soc->npins)
860 return -EINVAL;
861
862 /*
863 * "Virtual" GPIOs are always and only used for interrupts
864 * Since they are only used for interrupts, they are always inputs
865 */
866 if (mtk_is_virt_gpio(hw, gpio))
867 return 1;
868
869 desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
870
871 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &value);
872 if (err)
873 return err;
874
875 if (value)
876 return GPIO_LINE_DIRECTION_OUT;
877
878 return GPIO_LINE_DIRECTION_IN;
879 }
880
mtk_gpio_get(struct gpio_chip * chip,unsigned int gpio)881 static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio)
882 {
883 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
884 const struct mtk_pin_desc *desc;
885 int value, err;
886
887 if (gpio >= hw->soc->npins)
888 return -EINVAL;
889
890 desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
891
892 err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);
893 if (err)
894 return err;
895
896 return !!value;
897 }
898
mtk_gpio_set(struct gpio_chip * chip,unsigned int gpio,int value)899 static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
900 {
901 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
902 const struct mtk_pin_desc *desc;
903
904 if (gpio >= hw->soc->npins)
905 return;
906
907 desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
908
909 mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value);
910 }
911
mtk_gpio_direction_input(struct gpio_chip * chip,unsigned int gpio)912 static int mtk_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio)
913 {
914 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
915
916 if (gpio >= hw->soc->npins)
917 return -EINVAL;
918
919 return pinctrl_gpio_direction_input(chip, gpio);
920 }
921
mtk_gpio_direction_output(struct gpio_chip * chip,unsigned int gpio,int value)922 static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio,
923 int value)
924 {
925 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
926
927 if (gpio >= hw->soc->npins)
928 return -EINVAL;
929
930 mtk_gpio_set(chip, gpio, value);
931
932 return pinctrl_gpio_direction_output(chip, gpio);
933 }
934
mtk_gpio_to_irq(struct gpio_chip * chip,unsigned int offset)935 static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
936 {
937 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
938 const struct mtk_pin_desc *desc;
939
940 if (!hw->eint)
941 return -ENOTSUPP;
942
943 desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
944
945 if (desc->eint.eint_n == EINT_NA)
946 return -ENOTSUPP;
947
948 return mtk_eint_find_irq(hw->eint, desc->eint.eint_n);
949 }
950
mtk_gpio_set_config(struct gpio_chip * chip,unsigned int offset,unsigned long config)951 static int mtk_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
952 unsigned long config)
953 {
954 struct mtk_pinctrl *hw = gpiochip_get_data(chip);
955 const struct mtk_pin_desc *desc;
956 u32 debounce;
957
958 desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
959
960 if (!hw->eint ||
961 pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE ||
962 desc->eint.eint_n == EINT_NA)
963 return -ENOTSUPP;
964
965 debounce = pinconf_to_config_argument(config);
966
967 return mtk_eint_set_debounce(hw->eint, desc->eint.eint_n, debounce);
968 }
969
mtk_build_gpiochip(struct mtk_pinctrl * hw)970 static int mtk_build_gpiochip(struct mtk_pinctrl *hw)
971 {
972 struct gpio_chip *chip = &hw->chip;
973 int ret;
974
975 chip->label = PINCTRL_PINCTRL_DEV;
976 chip->parent = hw->dev;
977 chip->request = gpiochip_generic_request;
978 chip->free = gpiochip_generic_free;
979 chip->get_direction = mtk_gpio_get_direction;
980 chip->direction_input = mtk_gpio_direction_input;
981 chip->direction_output = mtk_gpio_direction_output;
982 chip->get = mtk_gpio_get;
983 chip->set = mtk_gpio_set;
984 chip->to_irq = mtk_gpio_to_irq;
985 chip->set_config = mtk_gpio_set_config;
986 chip->base = -1;
987 chip->ngpio = hw->soc->npins;
988
989 ret = gpiochip_add_data(chip, hw);
990 if (ret < 0)
991 return ret;
992
993 return 0;
994 }
995
mtk_pctrl_build_state(struct platform_device * pdev)996 static int mtk_pctrl_build_state(struct platform_device *pdev)
997 {
998 struct mtk_pinctrl *hw = platform_get_drvdata(pdev);
999 int i;
1000
1001 /* Allocate groups */
1002 hw->groups = devm_kmalloc_array(&pdev->dev, hw->soc->ngrps,
1003 sizeof(*hw->groups), GFP_KERNEL);
1004 if (!hw->groups)
1005 return -ENOMEM;
1006
1007 /* We assume that one pin is one group, use pin name as group name. */
1008 hw->grp_names = devm_kmalloc_array(&pdev->dev, hw->soc->ngrps,
1009 sizeof(*hw->grp_names), GFP_KERNEL);
1010 if (!hw->grp_names)
1011 return -ENOMEM;
1012
1013 for (i = 0; i < hw->soc->npins; i++) {
1014 const struct mtk_pin_desc *pin = hw->soc->pins + i;
1015 struct mtk_pinctrl_group *group = hw->groups + i;
1016
1017 group->name = pin->name;
1018 group->pin = pin->number;
1019
1020 hw->grp_names[i] = pin->name;
1021 }
1022
1023 return 0;
1024 }
1025
mtk_paris_pinctrl_probe(struct platform_device * pdev)1026 int mtk_paris_pinctrl_probe(struct platform_device *pdev)
1027 {
1028 struct device *dev = &pdev->dev;
1029 struct pinctrl_pin_desc *pins;
1030 struct mtk_pinctrl *hw;
1031 int err, i;
1032
1033 hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
1034 if (!hw)
1035 return -ENOMEM;
1036
1037 platform_set_drvdata(pdev, hw);
1038
1039 hw->soc = device_get_match_data(dev);
1040 if (!hw->soc)
1041 return -ENOENT;
1042
1043 hw->dev = &pdev->dev;
1044
1045 if (!hw->soc->nbase_names)
1046 return dev_err_probe(dev, -EINVAL,
1047 "SoC should be assigned at least one register base\n");
1048
1049 hw->base = devm_kmalloc_array(&pdev->dev, hw->soc->nbase_names,
1050 sizeof(*hw->base), GFP_KERNEL);
1051 if (!hw->base)
1052 return -ENOMEM;
1053
1054 for (i = 0; i < hw->soc->nbase_names; i++) {
1055 hw->base[i] = devm_platform_ioremap_resource_byname(pdev,
1056 hw->soc->base_names[i]);
1057 if (IS_ERR(hw->base[i]))
1058 return PTR_ERR(hw->base[i]);
1059 }
1060
1061 hw->nbase = hw->soc->nbase_names;
1062
1063 if (of_find_property(hw->dev->of_node,
1064 "mediatek,rsel-resistance-in-si-unit", NULL))
1065 hw->rsel_si_unit = true;
1066 else
1067 hw->rsel_si_unit = false;
1068
1069 spin_lock_init(&hw->lock);
1070
1071 err = mtk_pctrl_build_state(pdev);
1072 if (err)
1073 return dev_err_probe(dev, err, "build state failed\n");
1074
1075 /* Copy from internal struct mtk_pin_desc to register to the core */
1076 pins = devm_kmalloc_array(&pdev->dev, hw->soc->npins, sizeof(*pins),
1077 GFP_KERNEL);
1078 if (!pins)
1079 return -ENOMEM;
1080
1081 for (i = 0; i < hw->soc->npins; i++) {
1082 pins[i].number = hw->soc->pins[i].number;
1083 pins[i].name = hw->soc->pins[i].name;
1084 }
1085
1086 /* Setup pins descriptions per SoC types */
1087 mtk_desc.pins = (const struct pinctrl_pin_desc *)pins;
1088 mtk_desc.npins = hw->soc->npins;
1089 mtk_desc.num_custom_params = ARRAY_SIZE(mtk_custom_bindings);
1090 mtk_desc.custom_params = mtk_custom_bindings;
1091 #ifdef CONFIG_DEBUG_FS
1092 mtk_desc.custom_conf_items = mtk_conf_items;
1093 #endif
1094
1095 err = devm_pinctrl_register_and_init(&pdev->dev, &mtk_desc, hw,
1096 &hw->pctrl);
1097 if (err)
1098 return err;
1099
1100 err = pinctrl_enable(hw->pctrl);
1101 if (err)
1102 return err;
1103
1104 err = mtk_build_eint(hw, pdev);
1105 if (err)
1106 dev_warn(&pdev->dev,
1107 "Failed to add EINT, but pinctrl still can work\n");
1108
1109 /* Build gpiochip should be after pinctrl_enable is done */
1110 err = mtk_build_gpiochip(hw);
1111 if (err)
1112 return dev_err_probe(dev, err, "Failed to add gpio_chip\n");
1113
1114 platform_set_drvdata(pdev, hw);
1115
1116 return 0;
1117 }
1118 EXPORT_SYMBOL_GPL(mtk_paris_pinctrl_probe);
1119
mtk_paris_pinctrl_suspend(struct device * device)1120 static int mtk_paris_pinctrl_suspend(struct device *device)
1121 {
1122 struct mtk_pinctrl *pctl = dev_get_drvdata(device);
1123
1124 return mtk_eint_do_suspend(pctl->eint);
1125 }
1126
mtk_paris_pinctrl_resume(struct device * device)1127 static int mtk_paris_pinctrl_resume(struct device *device)
1128 {
1129 struct mtk_pinctrl *pctl = dev_get_drvdata(device);
1130
1131 return mtk_eint_do_resume(pctl->eint);
1132 }
1133
1134 EXPORT_GPL_DEV_SLEEP_PM_OPS(mtk_paris_pinctrl_pm_ops) = {
1135 NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_paris_pinctrl_suspend, mtk_paris_pinctrl_resume)
1136 };
1137
1138 MODULE_LICENSE("GPL v2");
1139 MODULE_DESCRIPTION("MediaTek Pinctrl Common Driver V2 Paris");
1140