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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[mirror_ubuntu-artful-kernel.git] / drivers / pinctrl / sunxi / pinctrl-sunxi.c
1 /*
2 * Allwinner A1X SoCs pinctrl driver.
3 *
4 * Copyright (C) 2012 Maxime Ripard
5 *
6 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 *
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
11 */
12
13 #include <linux/io.h>
14 #include <linux/clk.h>
15 #include <linux/gpio/driver.h>
16 #include <linux/irqdomain.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/export.h>
19 #include <linux/of.h>
20 #include <linux/of_address.h>
21 #include <linux/of_device.h>
22 #include <linux/of_irq.h>
23 #include <linux/pinctrl/consumer.h>
24 #include <linux/pinctrl/machine.h>
25 #include <linux/pinctrl/pinctrl.h>
26 #include <linux/pinctrl/pinconf-generic.h>
27 #include <linux/pinctrl/pinmux.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
30
31 #include "../core.h"
32 #include "../../gpio/gpiolib.h"
33 #include "pinctrl-sunxi.h"
34
35 static struct irq_chip sunxi_pinctrl_edge_irq_chip;
36 static struct irq_chip sunxi_pinctrl_level_irq_chip;
37
38 static struct sunxi_pinctrl_group *
39 sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group)
40 {
41 int i;
42
43 for (i = 0; i < pctl->ngroups; i++) {
44 struct sunxi_pinctrl_group *grp = pctl->groups + i;
45
46 if (!strcmp(grp->name, group))
47 return grp;
48 }
49
50 return NULL;
51 }
52
53 static struct sunxi_pinctrl_function *
54 sunxi_pinctrl_find_function_by_name(struct sunxi_pinctrl *pctl,
55 const char *name)
56 {
57 struct sunxi_pinctrl_function *func = pctl->functions;
58 int i;
59
60 for (i = 0; i < pctl->nfunctions; i++) {
61 if (!func[i].name)
62 break;
63
64 if (!strcmp(func[i].name, name))
65 return func + i;
66 }
67
68 return NULL;
69 }
70
71 static struct sunxi_desc_function *
72 sunxi_pinctrl_desc_find_function_by_name(struct sunxi_pinctrl *pctl,
73 const char *pin_name,
74 const char *func_name)
75 {
76 int i;
77
78 for (i = 0; i < pctl->desc->npins; i++) {
79 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
80
81 if (!strcmp(pin->pin.name, pin_name)) {
82 struct sunxi_desc_function *func = pin->functions;
83
84 while (func->name) {
85 if (!strcmp(func->name, func_name))
86 return func;
87
88 func++;
89 }
90 }
91 }
92
93 return NULL;
94 }
95
96 static struct sunxi_desc_function *
97 sunxi_pinctrl_desc_find_function_by_pin(struct sunxi_pinctrl *pctl,
98 const u16 pin_num,
99 const char *func_name)
100 {
101 int i;
102
103 for (i = 0; i < pctl->desc->npins; i++) {
104 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
105
106 if (pin->pin.number == pin_num) {
107 struct sunxi_desc_function *func = pin->functions;
108
109 while (func->name) {
110 if (!strcmp(func->name, func_name))
111 return func;
112
113 func++;
114 }
115 }
116 }
117
118 return NULL;
119 }
120
121 static int sunxi_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
122 {
123 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
124
125 return pctl->ngroups;
126 }
127
128 static const char *sunxi_pctrl_get_group_name(struct pinctrl_dev *pctldev,
129 unsigned group)
130 {
131 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
132
133 return pctl->groups[group].name;
134 }
135
136 static int sunxi_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
137 unsigned group,
138 const unsigned **pins,
139 unsigned *num_pins)
140 {
141 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
142
143 *pins = (unsigned *)&pctl->groups[group].pin;
144 *num_pins = 1;
145
146 return 0;
147 }
148
149 static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
150 struct device_node *node,
151 struct pinctrl_map **map,
152 unsigned *num_maps)
153 {
154 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
155 unsigned long *pinconfig;
156 struct property *prop;
157 const char *function;
158 const char *group;
159 int ret, nmaps, i = 0;
160 u32 val;
161
162 *map = NULL;
163 *num_maps = 0;
164
165 ret = of_property_read_string(node, "allwinner,function", &function);
166 if (ret) {
167 dev_err(pctl->dev,
168 "missing allwinner,function property in node %s\n",
169 node->name);
170 return -EINVAL;
171 }
172
173 nmaps = of_property_count_strings(node, "allwinner,pins") * 2;
174 if (nmaps < 0) {
175 dev_err(pctl->dev,
176 "missing allwinner,pins property in node %s\n",
177 node->name);
178 return -EINVAL;
179 }
180
181 *map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
182 if (!*map)
183 return -ENOMEM;
184
185 of_property_for_each_string(node, "allwinner,pins", prop, group) {
186 struct sunxi_pinctrl_group *grp =
187 sunxi_pinctrl_find_group_by_name(pctl, group);
188 int j = 0, configlen = 0;
189
190 if (!grp) {
191 dev_err(pctl->dev, "unknown pin %s", group);
192 continue;
193 }
194
195 if (!sunxi_pinctrl_desc_find_function_by_name(pctl,
196 grp->name,
197 function)) {
198 dev_err(pctl->dev, "unsupported function %s on pin %s",
199 function, group);
200 continue;
201 }
202
203 (*map)[i].type = PIN_MAP_TYPE_MUX_GROUP;
204 (*map)[i].data.mux.group = group;
205 (*map)[i].data.mux.function = function;
206
207 i++;
208
209 (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
210 (*map)[i].data.configs.group_or_pin = group;
211
212 if (of_find_property(node, "allwinner,drive", NULL))
213 configlen++;
214 if (of_find_property(node, "allwinner,pull", NULL))
215 configlen++;
216
217 pinconfig = kzalloc(configlen * sizeof(*pinconfig), GFP_KERNEL);
218 if (!pinconfig) {
219 kfree(*map);
220 return -ENOMEM;
221 }
222
223 if (!of_property_read_u32(node, "allwinner,drive", &val)) {
224 u16 strength = (val + 1) * 10;
225 pinconfig[j++] =
226 pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH,
227 strength);
228 }
229
230 if (!of_property_read_u32(node, "allwinner,pull", &val)) {
231 enum pin_config_param pull = PIN_CONFIG_END;
232 if (val == 1)
233 pull = PIN_CONFIG_BIAS_PULL_UP;
234 else if (val == 2)
235 pull = PIN_CONFIG_BIAS_PULL_DOWN;
236 pinconfig[j++] = pinconf_to_config_packed(pull, 0);
237 }
238
239 (*map)[i].data.configs.configs = pinconfig;
240 (*map)[i].data.configs.num_configs = configlen;
241
242 i++;
243 }
244
245 *num_maps = nmaps;
246
247 return 0;
248 }
249
250 static void sunxi_pctrl_dt_free_map(struct pinctrl_dev *pctldev,
251 struct pinctrl_map *map,
252 unsigned num_maps)
253 {
254 int i;
255
256 for (i = 0; i < num_maps; i++) {
257 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
258 kfree(map[i].data.configs.configs);
259 }
260
261 kfree(map);
262 }
263
264 static const struct pinctrl_ops sunxi_pctrl_ops = {
265 .dt_node_to_map = sunxi_pctrl_dt_node_to_map,
266 .dt_free_map = sunxi_pctrl_dt_free_map,
267 .get_groups_count = sunxi_pctrl_get_groups_count,
268 .get_group_name = sunxi_pctrl_get_group_name,
269 .get_group_pins = sunxi_pctrl_get_group_pins,
270 };
271
272 static int sunxi_pconf_group_get(struct pinctrl_dev *pctldev,
273 unsigned group,
274 unsigned long *config)
275 {
276 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
277
278 *config = pctl->groups[group].config;
279
280 return 0;
281 }
282
283 static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
284 unsigned group,
285 unsigned long *configs,
286 unsigned num_configs)
287 {
288 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
289 struct sunxi_pinctrl_group *g = &pctl->groups[group];
290 unsigned long flags;
291 unsigned pin = g->pin - pctl->desc->pin_base;
292 u32 val, mask;
293 u16 strength;
294 u8 dlevel;
295 int i;
296
297 spin_lock_irqsave(&pctl->lock, flags);
298
299 for (i = 0; i < num_configs; i++) {
300 switch (pinconf_to_config_param(configs[i])) {
301 case PIN_CONFIG_DRIVE_STRENGTH:
302 strength = pinconf_to_config_argument(configs[i]);
303 if (strength > 40) {
304 spin_unlock_irqrestore(&pctl->lock, flags);
305 return -EINVAL;
306 }
307 /*
308 * We convert from mA to what the register expects:
309 * 0: 10mA
310 * 1: 20mA
311 * 2: 30mA
312 * 3: 40mA
313 */
314 dlevel = strength / 10 - 1;
315 val = readl(pctl->membase + sunxi_dlevel_reg(pin));
316 mask = DLEVEL_PINS_MASK << sunxi_dlevel_offset(pin);
317 writel((val & ~mask)
318 | dlevel << sunxi_dlevel_offset(pin),
319 pctl->membase + sunxi_dlevel_reg(pin));
320 break;
321 case PIN_CONFIG_BIAS_PULL_UP:
322 val = readl(pctl->membase + sunxi_pull_reg(pin));
323 mask = PULL_PINS_MASK << sunxi_pull_offset(pin);
324 writel((val & ~mask) | 1 << sunxi_pull_offset(pin),
325 pctl->membase + sunxi_pull_reg(pin));
326 break;
327 case PIN_CONFIG_BIAS_PULL_DOWN:
328 val = readl(pctl->membase + sunxi_pull_reg(pin));
329 mask = PULL_PINS_MASK << sunxi_pull_offset(pin);
330 writel((val & ~mask) | 2 << sunxi_pull_offset(pin),
331 pctl->membase + sunxi_pull_reg(pin));
332 break;
333 default:
334 break;
335 }
336 /* cache the config value */
337 g->config = configs[i];
338 } /* for each config */
339
340 spin_unlock_irqrestore(&pctl->lock, flags);
341
342 return 0;
343 }
344
345 static const struct pinconf_ops sunxi_pconf_ops = {
346 .pin_config_group_get = sunxi_pconf_group_get,
347 .pin_config_group_set = sunxi_pconf_group_set,
348 };
349
350 static int sunxi_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
351 {
352 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
353
354 return pctl->nfunctions;
355 }
356
357 static const char *sunxi_pmx_get_func_name(struct pinctrl_dev *pctldev,
358 unsigned function)
359 {
360 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
361
362 return pctl->functions[function].name;
363 }
364
365 static int sunxi_pmx_get_func_groups(struct pinctrl_dev *pctldev,
366 unsigned function,
367 const char * const **groups,
368 unsigned * const num_groups)
369 {
370 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
371
372 *groups = pctl->functions[function].groups;
373 *num_groups = pctl->functions[function].ngroups;
374
375 return 0;
376 }
377
378 static void sunxi_pmx_set(struct pinctrl_dev *pctldev,
379 unsigned pin,
380 u8 config)
381 {
382 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
383 unsigned long flags;
384 u32 val, mask;
385
386 spin_lock_irqsave(&pctl->lock, flags);
387
388 pin -= pctl->desc->pin_base;
389 val = readl(pctl->membase + sunxi_mux_reg(pin));
390 mask = MUX_PINS_MASK << sunxi_mux_offset(pin);
391 writel((val & ~mask) | config << sunxi_mux_offset(pin),
392 pctl->membase + sunxi_mux_reg(pin));
393
394 spin_unlock_irqrestore(&pctl->lock, flags);
395 }
396
397 static int sunxi_pmx_set_mux(struct pinctrl_dev *pctldev,
398 unsigned function,
399 unsigned group)
400 {
401 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
402 struct sunxi_pinctrl_group *g = pctl->groups + group;
403 struct sunxi_pinctrl_function *func = pctl->functions + function;
404 struct sunxi_desc_function *desc =
405 sunxi_pinctrl_desc_find_function_by_name(pctl,
406 g->name,
407 func->name);
408
409 if (!desc)
410 return -EINVAL;
411
412 sunxi_pmx_set(pctldev, g->pin, desc->muxval);
413
414 return 0;
415 }
416
417 static int
418 sunxi_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
419 struct pinctrl_gpio_range *range,
420 unsigned offset,
421 bool input)
422 {
423 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
424 struct sunxi_desc_function *desc;
425 const char *func;
426
427 if (input)
428 func = "gpio_in";
429 else
430 func = "gpio_out";
431
432 desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, func);
433 if (!desc)
434 return -EINVAL;
435
436 sunxi_pmx_set(pctldev, offset, desc->muxval);
437
438 return 0;
439 }
440
441 static const struct pinmux_ops sunxi_pmx_ops = {
442 .get_functions_count = sunxi_pmx_get_funcs_cnt,
443 .get_function_name = sunxi_pmx_get_func_name,
444 .get_function_groups = sunxi_pmx_get_func_groups,
445 .set_mux = sunxi_pmx_set_mux,
446 .gpio_set_direction = sunxi_pmx_gpio_set_direction,
447 };
448
449 static int sunxi_pinctrl_gpio_direction_input(struct gpio_chip *chip,
450 unsigned offset)
451 {
452 return pinctrl_gpio_direction_input(chip->base + offset);
453 }
454
455 static int sunxi_pinctrl_gpio_get(struct gpio_chip *chip, unsigned offset)
456 {
457 struct sunxi_pinctrl *pctl = gpiochip_get_data(chip);
458 u32 reg = sunxi_data_reg(offset);
459 u8 index = sunxi_data_offset(offset);
460 u32 set_mux = pctl->desc->irq_read_needs_mux &&
461 test_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
462 u32 pin = offset + chip->base;
463 u32 val;
464
465 if (set_mux)
466 sunxi_pmx_set(pctl->pctl_dev, pin, SUN4I_FUNC_INPUT);
467
468 val = (readl(pctl->membase + reg) >> index) & DATA_PINS_MASK;
469
470 if (set_mux)
471 sunxi_pmx_set(pctl->pctl_dev, pin, SUN4I_FUNC_IRQ);
472
473 return !!val;
474 }
475
476 static void sunxi_pinctrl_gpio_set(struct gpio_chip *chip,
477 unsigned offset, int value)
478 {
479 struct sunxi_pinctrl *pctl = gpiochip_get_data(chip);
480 u32 reg = sunxi_data_reg(offset);
481 u8 index = sunxi_data_offset(offset);
482 unsigned long flags;
483 u32 regval;
484
485 spin_lock_irqsave(&pctl->lock, flags);
486
487 regval = readl(pctl->membase + reg);
488
489 if (value)
490 regval |= BIT(index);
491 else
492 regval &= ~(BIT(index));
493
494 writel(regval, pctl->membase + reg);
495
496 spin_unlock_irqrestore(&pctl->lock, flags);
497 }
498
499 static int sunxi_pinctrl_gpio_direction_output(struct gpio_chip *chip,
500 unsigned offset, int value)
501 {
502 sunxi_pinctrl_gpio_set(chip, offset, value);
503 return pinctrl_gpio_direction_output(chip->base + offset);
504 }
505
506 static int sunxi_pinctrl_gpio_of_xlate(struct gpio_chip *gc,
507 const struct of_phandle_args *gpiospec,
508 u32 *flags)
509 {
510 int pin, base;
511
512 base = PINS_PER_BANK * gpiospec->args[0];
513 pin = base + gpiospec->args[1];
514
515 if (pin > gc->ngpio)
516 return -EINVAL;
517
518 if (flags)
519 *flags = gpiospec->args[2];
520
521 return pin;
522 }
523
524 static int sunxi_pinctrl_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
525 {
526 struct sunxi_pinctrl *pctl = gpiochip_get_data(chip);
527 struct sunxi_desc_function *desc;
528 unsigned pinnum = pctl->desc->pin_base + offset;
529 unsigned irqnum;
530
531 if (offset >= chip->ngpio)
532 return -ENXIO;
533
534 desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pinnum, "irq");
535 if (!desc)
536 return -EINVAL;
537
538 irqnum = desc->irqbank * IRQ_PER_BANK + desc->irqnum;
539
540 dev_dbg(chip->parent, "%s: request IRQ for GPIO %d, return %d\n",
541 chip->label, offset + chip->base, irqnum);
542
543 return irq_find_mapping(pctl->domain, irqnum);
544 }
545
546 static int sunxi_pinctrl_irq_request_resources(struct irq_data *d)
547 {
548 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
549 struct sunxi_desc_function *func;
550 int ret;
551
552 func = sunxi_pinctrl_desc_find_function_by_pin(pctl,
553 pctl->irq_array[d->hwirq], "irq");
554 if (!func)
555 return -EINVAL;
556
557 ret = gpiochip_lock_as_irq(pctl->chip,
558 pctl->irq_array[d->hwirq] - pctl->desc->pin_base);
559 if (ret) {
560 dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
561 irqd_to_hwirq(d));
562 return ret;
563 }
564
565 /* Change muxing to INT mode */
566 sunxi_pmx_set(pctl->pctl_dev, pctl->irq_array[d->hwirq], func->muxval);
567
568 return 0;
569 }
570
571 static void sunxi_pinctrl_irq_release_resources(struct irq_data *d)
572 {
573 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
574
575 gpiochip_unlock_as_irq(pctl->chip,
576 pctl->irq_array[d->hwirq] - pctl->desc->pin_base);
577 }
578
579 static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type)
580 {
581 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
582 u32 reg = sunxi_irq_cfg_reg(d->hwirq);
583 u8 index = sunxi_irq_cfg_offset(d->hwirq);
584 unsigned long flags;
585 u32 regval;
586 u8 mode;
587
588 switch (type) {
589 case IRQ_TYPE_EDGE_RISING:
590 mode = IRQ_EDGE_RISING;
591 break;
592 case IRQ_TYPE_EDGE_FALLING:
593 mode = IRQ_EDGE_FALLING;
594 break;
595 case IRQ_TYPE_EDGE_BOTH:
596 mode = IRQ_EDGE_BOTH;
597 break;
598 case IRQ_TYPE_LEVEL_HIGH:
599 mode = IRQ_LEVEL_HIGH;
600 break;
601 case IRQ_TYPE_LEVEL_LOW:
602 mode = IRQ_LEVEL_LOW;
603 break;
604 default:
605 return -EINVAL;
606 }
607
608 spin_lock_irqsave(&pctl->lock, flags);
609
610 if (type & IRQ_TYPE_LEVEL_MASK)
611 irq_set_chip_handler_name_locked(d, &sunxi_pinctrl_level_irq_chip,
612 handle_fasteoi_irq, NULL);
613 else
614 irq_set_chip_handler_name_locked(d, &sunxi_pinctrl_edge_irq_chip,
615 handle_edge_irq, NULL);
616
617 regval = readl(pctl->membase + reg);
618 regval &= ~(IRQ_CFG_IRQ_MASK << index);
619 writel(regval | (mode << index), pctl->membase + reg);
620
621 spin_unlock_irqrestore(&pctl->lock, flags);
622
623 return 0;
624 }
625
626 static void sunxi_pinctrl_irq_ack(struct irq_data *d)
627 {
628 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
629 u32 status_reg = sunxi_irq_status_reg(d->hwirq);
630 u8 status_idx = sunxi_irq_status_offset(d->hwirq);
631
632 /* Clear the IRQ */
633 writel(1 << status_idx, pctl->membase + status_reg);
634 }
635
636 static void sunxi_pinctrl_irq_mask(struct irq_data *d)
637 {
638 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
639 u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
640 u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
641 unsigned long flags;
642 u32 val;
643
644 spin_lock_irqsave(&pctl->lock, flags);
645
646 /* Mask the IRQ */
647 val = readl(pctl->membase + reg);
648 writel(val & ~(1 << idx), pctl->membase + reg);
649
650 spin_unlock_irqrestore(&pctl->lock, flags);
651 }
652
653 static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
654 {
655 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
656 u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
657 u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
658 unsigned long flags;
659 u32 val;
660
661 spin_lock_irqsave(&pctl->lock, flags);
662
663 /* Unmask the IRQ */
664 val = readl(pctl->membase + reg);
665 writel(val | (1 << idx), pctl->membase + reg);
666
667 spin_unlock_irqrestore(&pctl->lock, flags);
668 }
669
670 static void sunxi_pinctrl_irq_ack_unmask(struct irq_data *d)
671 {
672 sunxi_pinctrl_irq_ack(d);
673 sunxi_pinctrl_irq_unmask(d);
674 }
675
676 static struct irq_chip sunxi_pinctrl_edge_irq_chip = {
677 .name = "sunxi_pio_edge",
678 .irq_ack = sunxi_pinctrl_irq_ack,
679 .irq_mask = sunxi_pinctrl_irq_mask,
680 .irq_unmask = sunxi_pinctrl_irq_unmask,
681 .irq_request_resources = sunxi_pinctrl_irq_request_resources,
682 .irq_release_resources = sunxi_pinctrl_irq_release_resources,
683 .irq_set_type = sunxi_pinctrl_irq_set_type,
684 .flags = IRQCHIP_SKIP_SET_WAKE,
685 };
686
687 static struct irq_chip sunxi_pinctrl_level_irq_chip = {
688 .name = "sunxi_pio_level",
689 .irq_eoi = sunxi_pinctrl_irq_ack,
690 .irq_mask = sunxi_pinctrl_irq_mask,
691 .irq_unmask = sunxi_pinctrl_irq_unmask,
692 /* Define irq_enable / disable to avoid spurious irqs for drivers
693 * using these to suppress irqs while they clear the irq source */
694 .irq_enable = sunxi_pinctrl_irq_ack_unmask,
695 .irq_disable = sunxi_pinctrl_irq_mask,
696 .irq_request_resources = sunxi_pinctrl_irq_request_resources,
697 .irq_release_resources = sunxi_pinctrl_irq_release_resources,
698 .irq_set_type = sunxi_pinctrl_irq_set_type,
699 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED |
700 IRQCHIP_EOI_IF_HANDLED,
701 };
702
703 static int sunxi_pinctrl_irq_of_xlate(struct irq_domain *d,
704 struct device_node *node,
705 const u32 *intspec,
706 unsigned int intsize,
707 unsigned long *out_hwirq,
708 unsigned int *out_type)
709 {
710 struct sunxi_pinctrl *pctl = d->host_data;
711 struct sunxi_desc_function *desc;
712 int pin, base;
713
714 if (intsize < 3)
715 return -EINVAL;
716
717 base = PINS_PER_BANK * intspec[0];
718 pin = pctl->desc->pin_base + base + intspec[1];
719
720 desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pin, "irq");
721 if (!desc)
722 return -EINVAL;
723
724 *out_hwirq = desc->irqbank * PINS_PER_BANK + desc->irqnum;
725 *out_type = intspec[2];
726
727 return 0;
728 }
729
730 static struct irq_domain_ops sunxi_pinctrl_irq_domain_ops = {
731 .xlate = sunxi_pinctrl_irq_of_xlate,
732 };
733
734 static void sunxi_pinctrl_irq_handler(struct irq_desc *desc)
735 {
736 unsigned int irq = irq_desc_get_irq(desc);
737 struct irq_chip *chip = irq_desc_get_chip(desc);
738 struct sunxi_pinctrl *pctl = irq_desc_get_handler_data(desc);
739 unsigned long bank, reg, val;
740
741 for (bank = 0; bank < pctl->desc->irq_banks; bank++)
742 if (irq == pctl->irq[bank])
743 break;
744
745 if (bank == pctl->desc->irq_banks)
746 return;
747
748 reg = sunxi_irq_status_reg_from_bank(bank);
749 val = readl(pctl->membase + reg);
750
751 if (val) {
752 int irqoffset;
753
754 chained_irq_enter(chip, desc);
755 for_each_set_bit(irqoffset, &val, IRQ_PER_BANK) {
756 int pin_irq = irq_find_mapping(pctl->domain,
757 bank * IRQ_PER_BANK + irqoffset);
758 generic_handle_irq(pin_irq);
759 }
760 chained_irq_exit(chip, desc);
761 }
762 }
763
764 static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
765 const char *name)
766 {
767 struct sunxi_pinctrl_function *func = pctl->functions;
768
769 while (func->name) {
770 /* function already there */
771 if (strcmp(func->name, name) == 0) {
772 func->ngroups++;
773 return -EEXIST;
774 }
775 func++;
776 }
777
778 func->name = name;
779 func->ngroups = 1;
780
781 pctl->nfunctions++;
782
783 return 0;
784 }
785
786 static int sunxi_pinctrl_build_state(struct platform_device *pdev)
787 {
788 struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev);
789 int i;
790
791 pctl->ngroups = pctl->desc->npins;
792
793 /* Allocate groups */
794 pctl->groups = devm_kzalloc(&pdev->dev,
795 pctl->ngroups * sizeof(*pctl->groups),
796 GFP_KERNEL);
797 if (!pctl->groups)
798 return -ENOMEM;
799
800 for (i = 0; i < pctl->desc->npins; i++) {
801 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
802 struct sunxi_pinctrl_group *group = pctl->groups + i;
803
804 group->name = pin->pin.name;
805 group->pin = pin->pin.number;
806 }
807
808 /*
809 * We suppose that we won't have any more functions than pins,
810 * we'll reallocate that later anyway
811 */
812 pctl->functions = devm_kzalloc(&pdev->dev,
813 pctl->desc->npins * sizeof(*pctl->functions),
814 GFP_KERNEL);
815 if (!pctl->functions)
816 return -ENOMEM;
817
818 /* Count functions and their associated groups */
819 for (i = 0; i < pctl->desc->npins; i++) {
820 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
821 struct sunxi_desc_function *func = pin->functions;
822
823 while (func->name) {
824 /* Create interrupt mapping while we're at it */
825 if (!strcmp(func->name, "irq")) {
826 int irqnum = func->irqnum + func->irqbank * IRQ_PER_BANK;
827 pctl->irq_array[irqnum] = pin->pin.number;
828 }
829
830 sunxi_pinctrl_add_function(pctl, func->name);
831 func++;
832 }
833 }
834
835 pctl->functions = krealloc(pctl->functions,
836 pctl->nfunctions * sizeof(*pctl->functions),
837 GFP_KERNEL);
838
839 for (i = 0; i < pctl->desc->npins; i++) {
840 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
841 struct sunxi_desc_function *func = pin->functions;
842
843 while (func->name) {
844 struct sunxi_pinctrl_function *func_item;
845 const char **func_grp;
846
847 func_item = sunxi_pinctrl_find_function_by_name(pctl,
848 func->name);
849 if (!func_item)
850 return -EINVAL;
851
852 if (!func_item->groups) {
853 func_item->groups =
854 devm_kzalloc(&pdev->dev,
855 func_item->ngroups * sizeof(*func_item->groups),
856 GFP_KERNEL);
857 if (!func_item->groups)
858 return -ENOMEM;
859 }
860
861 func_grp = func_item->groups;
862 while (*func_grp)
863 func_grp++;
864
865 *func_grp = pin->pin.name;
866 func++;
867 }
868 }
869
870 return 0;
871 }
872
873 int sunxi_pinctrl_init(struct platform_device *pdev,
874 const struct sunxi_pinctrl_desc *desc)
875 {
876 struct device_node *node = pdev->dev.of_node;
877 struct pinctrl_desc *pctrl_desc;
878 struct pinctrl_pin_desc *pins;
879 struct sunxi_pinctrl *pctl;
880 struct resource *res;
881 int i, ret, last_pin;
882 struct clk *clk;
883
884 pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
885 if (!pctl)
886 return -ENOMEM;
887 platform_set_drvdata(pdev, pctl);
888
889 spin_lock_init(&pctl->lock);
890
891 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
892 pctl->membase = devm_ioremap_resource(&pdev->dev, res);
893 if (IS_ERR(pctl->membase))
894 return PTR_ERR(pctl->membase);
895
896 pctl->dev = &pdev->dev;
897 pctl->desc = desc;
898
899 pctl->irq_array = devm_kcalloc(&pdev->dev,
900 IRQ_PER_BANK * pctl->desc->irq_banks,
901 sizeof(*pctl->irq_array),
902 GFP_KERNEL);
903 if (!pctl->irq_array)
904 return -ENOMEM;
905
906 ret = sunxi_pinctrl_build_state(pdev);
907 if (ret) {
908 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
909 return ret;
910 }
911
912 pins = devm_kzalloc(&pdev->dev,
913 pctl->desc->npins * sizeof(*pins),
914 GFP_KERNEL);
915 if (!pins)
916 return -ENOMEM;
917
918 for (i = 0; i < pctl->desc->npins; i++)
919 pins[i] = pctl->desc->pins[i].pin;
920
921 pctrl_desc = devm_kzalloc(&pdev->dev,
922 sizeof(*pctrl_desc),
923 GFP_KERNEL);
924 if (!pctrl_desc)
925 return -ENOMEM;
926
927 pctrl_desc->name = dev_name(&pdev->dev);
928 pctrl_desc->owner = THIS_MODULE;
929 pctrl_desc->pins = pins;
930 pctrl_desc->npins = pctl->desc->npins;
931 pctrl_desc->confops = &sunxi_pconf_ops;
932 pctrl_desc->pctlops = &sunxi_pctrl_ops;
933 pctrl_desc->pmxops = &sunxi_pmx_ops;
934
935 pctl->pctl_dev = pinctrl_register(pctrl_desc,
936 &pdev->dev, pctl);
937 if (IS_ERR(pctl->pctl_dev)) {
938 dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
939 return PTR_ERR(pctl->pctl_dev);
940 }
941
942 pctl->chip = devm_kzalloc(&pdev->dev, sizeof(*pctl->chip), GFP_KERNEL);
943 if (!pctl->chip) {
944 ret = -ENOMEM;
945 goto pinctrl_error;
946 }
947
948 last_pin = pctl->desc->pins[pctl->desc->npins - 1].pin.number;
949 pctl->chip->owner = THIS_MODULE;
950 pctl->chip->request = gpiochip_generic_request,
951 pctl->chip->free = gpiochip_generic_free,
952 pctl->chip->direction_input = sunxi_pinctrl_gpio_direction_input,
953 pctl->chip->direction_output = sunxi_pinctrl_gpio_direction_output,
954 pctl->chip->get = sunxi_pinctrl_gpio_get,
955 pctl->chip->set = sunxi_pinctrl_gpio_set,
956 pctl->chip->of_xlate = sunxi_pinctrl_gpio_of_xlate,
957 pctl->chip->to_irq = sunxi_pinctrl_gpio_to_irq,
958 pctl->chip->of_gpio_n_cells = 3,
959 pctl->chip->can_sleep = false,
960 pctl->chip->ngpio = round_up(last_pin, PINS_PER_BANK) -
961 pctl->desc->pin_base;
962 pctl->chip->label = dev_name(&pdev->dev);
963 pctl->chip->parent = &pdev->dev;
964 pctl->chip->base = pctl->desc->pin_base;
965
966 ret = gpiochip_add_data(pctl->chip, pctl);
967 if (ret)
968 goto pinctrl_error;
969
970 for (i = 0; i < pctl->desc->npins; i++) {
971 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
972
973 ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev),
974 pin->pin.number - pctl->desc->pin_base,
975 pin->pin.number, 1);
976 if (ret)
977 goto gpiochip_error;
978 }
979
980 clk = devm_clk_get(&pdev->dev, NULL);
981 if (IS_ERR(clk)) {
982 ret = PTR_ERR(clk);
983 goto gpiochip_error;
984 }
985
986 ret = clk_prepare_enable(clk);
987 if (ret)
988 goto gpiochip_error;
989
990 pctl->irq = devm_kcalloc(&pdev->dev,
991 pctl->desc->irq_banks,
992 sizeof(*pctl->irq),
993 GFP_KERNEL);
994 if (!pctl->irq) {
995 ret = -ENOMEM;
996 goto clk_error;
997 }
998
999 for (i = 0; i < pctl->desc->irq_banks; i++) {
1000 pctl->irq[i] = platform_get_irq(pdev, i);
1001 if (pctl->irq[i] < 0) {
1002 ret = pctl->irq[i];
1003 goto clk_error;
1004 }
1005 }
1006
1007 pctl->domain = irq_domain_add_linear(node,
1008 pctl->desc->irq_banks * IRQ_PER_BANK,
1009 &sunxi_pinctrl_irq_domain_ops,
1010 pctl);
1011 if (!pctl->domain) {
1012 dev_err(&pdev->dev, "Couldn't register IRQ domain\n");
1013 ret = -ENOMEM;
1014 goto clk_error;
1015 }
1016
1017 for (i = 0; i < (pctl->desc->irq_banks * IRQ_PER_BANK); i++) {
1018 int irqno = irq_create_mapping(pctl->domain, i);
1019
1020 irq_set_chip_and_handler(irqno, &sunxi_pinctrl_edge_irq_chip,
1021 handle_edge_irq);
1022 irq_set_chip_data(irqno, pctl);
1023 }
1024
1025 for (i = 0; i < pctl->desc->irq_banks; i++) {
1026 /* Mask and clear all IRQs before registering a handler */
1027 writel(0, pctl->membase + sunxi_irq_ctrl_reg_from_bank(i));
1028 writel(0xffffffff,
1029 pctl->membase + sunxi_irq_status_reg_from_bank(i));
1030
1031 irq_set_chained_handler_and_data(pctl->irq[i],
1032 sunxi_pinctrl_irq_handler,
1033 pctl);
1034 }
1035
1036 dev_info(&pdev->dev, "initialized sunXi PIO driver\n");
1037
1038 return 0;
1039
1040 clk_error:
1041 clk_disable_unprepare(clk);
1042 gpiochip_error:
1043 gpiochip_remove(pctl->chip);
1044 pinctrl_error:
1045 pinctrl_unregister(pctl->pctl_dev);
1046 return ret;
1047 }
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