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Linux 3.11-rc3
[cris-mirror.git] / drivers / pinctrl / pinctrl-sunxi.c
blobc47fd1e5450ba6f26ba8e70f2ad207efc1959a82
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.h>
16 #include <linux/irqdomain.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/of_address.h>
20 #include <linux/of_device.h>
21 #include <linux/of_irq.h>
22 #include <linux/pinctrl/consumer.h>
23 #include <linux/pinctrl/machine.h>
24 #include <linux/pinctrl/pinctrl.h>
25 #include <linux/pinctrl/pinconf-generic.h>
26 #include <linux/pinctrl/pinmux.h>
27 #include <linux/platform_device.h>
28 #include <linux/slab.h>
29
30 #include "core.h"
31 #include "pinctrl-sunxi.h"
32 #include "pinctrl-sunxi-pins.h"
33
34 static struct sunxi_pinctrl_group *
35 sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group)
36 {
37 int i;
38
39 for (i = 0; i < pctl->ngroups; i++) {
40 struct sunxi_pinctrl_group *grp = pctl->groups + i;
41
42 if (!strcmp(grp->name, group))
43 return grp;
44 }
45
46 return NULL;
47 }
48
49 static struct sunxi_pinctrl_function *
50 sunxi_pinctrl_find_function_by_name(struct sunxi_pinctrl *pctl,
51 const char *name)
52 {
53 struct sunxi_pinctrl_function *func = pctl->functions;
54 int i;
55
56 for (i = 0; i < pctl->nfunctions; i++) {
57 if (!func[i].name)
58 break;
59
60 if (!strcmp(func[i].name, name))
61 return func + i;
62 }
63
64 return NULL;
65 }
66
67 static struct sunxi_desc_function *
68 sunxi_pinctrl_desc_find_function_by_name(struct sunxi_pinctrl *pctl,
69 const char *pin_name,
70 const char *func_name)
71 {
72 int i;
73
74 for (i = 0; i < pctl->desc->npins; i++) {
75 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
76
77 if (!strcmp(pin->pin.name, pin_name)) {
78 struct sunxi_desc_function *func = pin->functions;
79
80 while (func->name) {
81 if (!strcmp(func->name, func_name))
82 return func;
83
84 func++;
85 }
86 }
87 }
88
89 return NULL;
90 }
91
92 static struct sunxi_desc_function *
93 sunxi_pinctrl_desc_find_function_by_pin(struct sunxi_pinctrl *pctl,
94 const u16 pin_num,
95 const char *func_name)
96 {
97 int i;
98
99 for (i = 0; i < pctl->desc->npins; i++) {
100 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
101
102 if (pin->pin.number == pin_num) {
103 struct sunxi_desc_function *func = pin->functions;
104
105 while (func->name) {
106 if (!strcmp(func->name, func_name))
107 return func;
108
109 func++;
110 }
111 }
112 }
113
114 return NULL;
115 }
116
117 static int sunxi_pctrl_get_groups_count(struct pinctrl_dev *pctldev)
118 {
119 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
120
121 return pctl->ngroups;
122 }
123
124 static const char *sunxi_pctrl_get_group_name(struct pinctrl_dev *pctldev,
125 unsigned group)
126 {
127 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
128
129 return pctl->groups[group].name;
130 }
131
132 static int sunxi_pctrl_get_group_pins(struct pinctrl_dev *pctldev,
133 unsigned group,
134 const unsigned **pins,
135 unsigned *num_pins)
136 {
137 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
138
139 *pins = (unsigned *)&pctl->groups[group].pin;
140 *num_pins = 1;
141
142 return 0;
143 }
144
145 static int sunxi_pctrl_dt_node_to_map(struct pinctrl_dev *pctldev,
146 struct device_node *node,
147 struct pinctrl_map **map,
148 unsigned *num_maps)
149 {
150 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
151 unsigned long *pinconfig;
152 struct property *prop;
153 const char *function;
154 const char *group;
155 int ret, nmaps, i = 0;
156 u32 val;
157
158 *map = NULL;
159 *num_maps = 0;
160
161 ret = of_property_read_string(node, "allwinner,function", &function);
162 if (ret) {
163 dev_err(pctl->dev,
164 "missing allwinner,function property in node %s\n",
165 node->name);
166 return -EINVAL;
167 }
168
169 nmaps = of_property_count_strings(node, "allwinner,pins") * 2;
170 if (nmaps < 0) {
171 dev_err(pctl->dev,
172 "missing allwinner,pins property in node %s\n",
173 node->name);
174 return -EINVAL;
175 }
176
177 *map = kmalloc(nmaps * sizeof(struct pinctrl_map), GFP_KERNEL);
178 if (!map)
179 return -ENOMEM;
180
181 of_property_for_each_string(node, "allwinner,pins", prop, group) {
182 struct sunxi_pinctrl_group *grp =
183 sunxi_pinctrl_find_group_by_name(pctl, group);
184 int j = 0, configlen = 0;
185
186 if (!grp) {
187 dev_err(pctl->dev, "unknown pin %s", group);
188 continue;
189 }
190
191 if (!sunxi_pinctrl_desc_find_function_by_name(pctl,
192 grp->name,
193 function)) {
194 dev_err(pctl->dev, "unsupported function %s on pin %s",
195 function, group);
196 continue;
197 }
198
199 (*map)[i].type = PIN_MAP_TYPE_MUX_GROUP;
200 (*map)[i].data.mux.group = group;
201 (*map)[i].data.mux.function = function;
202
203 i++;
204
205 (*map)[i].type = PIN_MAP_TYPE_CONFIGS_GROUP;
206 (*map)[i].data.configs.group_or_pin = group;
207
208 if (of_find_property(node, "allwinner,drive", NULL))
209 configlen++;
210 if (of_find_property(node, "allwinner,pull", NULL))
211 configlen++;
212
213 pinconfig = kzalloc(configlen * sizeof(*pinconfig), GFP_KERNEL);
214
215 if (!of_property_read_u32(node, "allwinner,drive", &val)) {
216 u16 strength = (val + 1) * 10;
217 pinconfig[j++] =
218 pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH,
219 strength);
220 }
221
222 if (!of_property_read_u32(node, "allwinner,pull", &val)) {
223 enum pin_config_param pull = PIN_CONFIG_END;
224 if (val == 1)
225 pull = PIN_CONFIG_BIAS_PULL_UP;
226 else if (val == 2)
227 pull = PIN_CONFIG_BIAS_PULL_DOWN;
228 pinconfig[j++] = pinconf_to_config_packed(pull, 0);
229 }
230
231 (*map)[i].data.configs.configs = pinconfig;
232 (*map)[i].data.configs.num_configs = configlen;
233
234 i++;
235 }
236
237 *num_maps = nmaps;
238
239 return 0;
240 }
241
242 static void sunxi_pctrl_dt_free_map(struct pinctrl_dev *pctldev,
243 struct pinctrl_map *map,
244 unsigned num_maps)
245 {
246 int i;
247
248 for (i = 0; i < num_maps; i++) {
249 if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP)
250 kfree(map[i].data.configs.configs);
251 }
252
253 kfree(map);
254 }
255
256 static const struct pinctrl_ops sunxi_pctrl_ops = {
257 .dt_node_to_map = sunxi_pctrl_dt_node_to_map,
258 .dt_free_map = sunxi_pctrl_dt_free_map,
259 .get_groups_count = sunxi_pctrl_get_groups_count,
260 .get_group_name = sunxi_pctrl_get_group_name,
261 .get_group_pins = sunxi_pctrl_get_group_pins,
262 };
263
264 static int sunxi_pconf_group_get(struct pinctrl_dev *pctldev,
265 unsigned group,
266 unsigned long *config)
267 {
268 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
269
270 *config = pctl->groups[group].config;
271
272 return 0;
273 }
274
275 static int sunxi_pconf_group_set(struct pinctrl_dev *pctldev,
276 unsigned group,
277 unsigned long config)
278 {
279 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
280 struct sunxi_pinctrl_group *g = &pctl->groups[group];
281 u32 val, mask;
282 u16 strength;
283 u8 dlevel;
284
285 switch (pinconf_to_config_param(config)) {
286 case PIN_CONFIG_DRIVE_STRENGTH:
287 strength = pinconf_to_config_argument(config);
288 if (strength > 40)
289 return -EINVAL;
290 /*
291 * We convert from mA to what the register expects:
292 * 0: 10mA
293 * 1: 20mA
294 * 2: 30mA
295 * 3: 40mA
296 */
297 dlevel = strength / 10 - 1;
298 val = readl(pctl->membase + sunxi_dlevel_reg(g->pin));
299 mask = DLEVEL_PINS_MASK << sunxi_dlevel_offset(g->pin);
300 writel((val & ~mask) | dlevel << sunxi_dlevel_offset(g->pin),
301 pctl->membase + sunxi_dlevel_reg(g->pin));
302 break;
303 case PIN_CONFIG_BIAS_PULL_UP:
304 val = readl(pctl->membase + sunxi_pull_reg(g->pin));
305 mask = PULL_PINS_MASK << sunxi_pull_offset(g->pin);
306 writel((val & ~mask) | 1 << sunxi_pull_offset(g->pin),
307 pctl->membase + sunxi_pull_reg(g->pin));
308 break;
309 case PIN_CONFIG_BIAS_PULL_DOWN:
310 val = readl(pctl->membase + sunxi_pull_reg(g->pin));
311 mask = PULL_PINS_MASK << sunxi_pull_offset(g->pin);
312 writel((val & ~mask) | 2 << sunxi_pull_offset(g->pin),
313 pctl->membase + sunxi_pull_reg(g->pin));
314 break;
315 default:
316 break;
317 }
318
319 /* cache the config value */
320 g->config = config;
321
322 return 0;
323 }
324
325 static const struct pinconf_ops sunxi_pconf_ops = {
326 .pin_config_group_get = sunxi_pconf_group_get,
327 .pin_config_group_set = sunxi_pconf_group_set,
328 };
329
330 static int sunxi_pmx_get_funcs_cnt(struct pinctrl_dev *pctldev)
331 {
332 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
333
334 return pctl->nfunctions;
335 }
336
337 static const char *sunxi_pmx_get_func_name(struct pinctrl_dev *pctldev,
338 unsigned function)
339 {
340 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
341
342 return pctl->functions[function].name;
343 }
344
345 static int sunxi_pmx_get_func_groups(struct pinctrl_dev *pctldev,
346 unsigned function,
347 const char * const **groups,
348 unsigned * const num_groups)
349 {
350 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
351
352 *groups = pctl->functions[function].groups;
353 *num_groups = pctl->functions[function].ngroups;
354
355 return 0;
356 }
357
358 static void sunxi_pmx_set(struct pinctrl_dev *pctldev,
359 unsigned pin,
360 u8 config)
361 {
362 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
363
364 u32 val = readl(pctl->membase + sunxi_mux_reg(pin));
365 u32 mask = MUX_PINS_MASK << sunxi_mux_offset(pin);
366 writel((val & ~mask) | config << sunxi_mux_offset(pin),
367 pctl->membase + sunxi_mux_reg(pin));
368 }
369
370 static int sunxi_pmx_enable(struct pinctrl_dev *pctldev,
371 unsigned function,
372 unsigned group)
373 {
374 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
375 struct sunxi_pinctrl_group *g = pctl->groups + group;
376 struct sunxi_pinctrl_function *func = pctl->functions + function;
377 struct sunxi_desc_function *desc =
378 sunxi_pinctrl_desc_find_function_by_name(pctl,
379 g->name,
380 func->name);
381
382 if (!desc)
383 return -EINVAL;
384
385 sunxi_pmx_set(pctldev, g->pin, desc->muxval);
386
387 return 0;
388 }
389
390 static int
391 sunxi_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
392 struct pinctrl_gpio_range *range,
393 unsigned offset,
394 bool input)
395 {
396 struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
397 struct sunxi_desc_function *desc;
398 const char *func;
399
400 if (input)
401 func = "gpio_in";
402 else
403 func = "gpio_out";
404
405 desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, func);
406 if (!desc)
407 return -EINVAL;
408
409 sunxi_pmx_set(pctldev, offset, desc->muxval);
410
411 return 0;
412 }
413
414 static const struct pinmux_ops sunxi_pmx_ops = {
415 .get_functions_count = sunxi_pmx_get_funcs_cnt,
416 .get_function_name = sunxi_pmx_get_func_name,
417 .get_function_groups = sunxi_pmx_get_func_groups,
418 .enable = sunxi_pmx_enable,
419 .gpio_set_direction = sunxi_pmx_gpio_set_direction,
420 };
421
422 static struct pinctrl_desc sunxi_pctrl_desc = {
423 .confops = &sunxi_pconf_ops,
424 .pctlops = &sunxi_pctrl_ops,
425 .pmxops = &sunxi_pmx_ops,
426 };
427
428 static int sunxi_pinctrl_gpio_request(struct gpio_chip *chip, unsigned offset)
429 {
430 return pinctrl_request_gpio(chip->base + offset);
431 }
432
433 static void sunxi_pinctrl_gpio_free(struct gpio_chip *chip, unsigned offset)
434 {
435 pinctrl_free_gpio(chip->base + offset);
436 }
437
438 static int sunxi_pinctrl_gpio_direction_input(struct gpio_chip *chip,
439 unsigned offset)
440 {
441 return pinctrl_gpio_direction_input(chip->base + offset);
442 }
443
444 static int sunxi_pinctrl_gpio_get(struct gpio_chip *chip, unsigned offset)
445 {
446 struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
447
448 u32 reg = sunxi_data_reg(offset);
449 u8 index = sunxi_data_offset(offset);
450 u32 val = (readl(pctl->membase + reg) >> index) & DATA_PINS_MASK;
451
452 return val;
453 }
454
455 static int sunxi_pinctrl_gpio_direction_output(struct gpio_chip *chip,
456 unsigned offset, int value)
457 {
458 return pinctrl_gpio_direction_output(chip->base + offset);
459 }
460
461 static void sunxi_pinctrl_gpio_set(struct gpio_chip *chip,
462 unsigned offset, int value)
463 {
464 struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
465 u32 reg = sunxi_data_reg(offset);
466 u8 index = sunxi_data_offset(offset);
467
468 writel((value & DATA_PINS_MASK) << index, pctl->membase + reg);
469 }
470
471 static int sunxi_pinctrl_gpio_of_xlate(struct gpio_chip *gc,
472 const struct of_phandle_args *gpiospec,
473 u32 *flags)
474 {
475 int pin, base;
476
477 base = PINS_PER_BANK * gpiospec->args[0];
478 pin = base + gpiospec->args[1];
479
480 if (pin > (gc->base + gc->ngpio))
481 return -EINVAL;
482
483 if (flags)
484 *flags = gpiospec->args[2];
485
486 return pin;
487 }
488
489 static int sunxi_pinctrl_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
490 {
491 struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
492 struct sunxi_desc_function *desc;
493
494 if (offset > chip->ngpio)
495 return -ENXIO;
496
497 desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, offset, "irq");
498 if (!desc)
499 return -EINVAL;
500
501 pctl->irq_array[desc->irqnum] = offset;
502
503 dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
504 chip->label, offset + chip->base, desc->irqnum);
505
506 return irq_find_mapping(pctl->domain, desc->irqnum);
507 }
508
509 static struct gpio_chip sunxi_pinctrl_gpio_chip = {
510 .owner = THIS_MODULE,
511 .request = sunxi_pinctrl_gpio_request,
512 .free = sunxi_pinctrl_gpio_free,
513 .direction_input = sunxi_pinctrl_gpio_direction_input,
514 .direction_output = sunxi_pinctrl_gpio_direction_output,
515 .get = sunxi_pinctrl_gpio_get,
516 .set = sunxi_pinctrl_gpio_set,
517 .of_xlate = sunxi_pinctrl_gpio_of_xlate,
518 .to_irq = sunxi_pinctrl_gpio_to_irq,
519 .of_gpio_n_cells = 3,
520 .can_sleep = 0,
521 };
522
523 static int sunxi_pinctrl_irq_set_type(struct irq_data *d,
524 unsigned int type)
525 {
526 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
527 u32 reg = sunxi_irq_cfg_reg(d->hwirq);
528 u8 index = sunxi_irq_cfg_offset(d->hwirq);
529 u8 mode;
530
531 switch (type) {
532 case IRQ_TYPE_EDGE_RISING:
533 mode = IRQ_EDGE_RISING;
534 break;
535 case IRQ_TYPE_EDGE_FALLING:
536 mode = IRQ_EDGE_FALLING;
537 break;
538 case IRQ_TYPE_EDGE_BOTH:
539 mode = IRQ_EDGE_BOTH;
540 break;
541 case IRQ_TYPE_LEVEL_HIGH:
542 mode = IRQ_LEVEL_HIGH;
543 break;
544 case IRQ_TYPE_LEVEL_LOW:
545 mode = IRQ_LEVEL_LOW;
546 break;
547 default:
548 return -EINVAL;
549 }
550
551 writel((mode & IRQ_CFG_IRQ_MASK) << index, pctl->membase + reg);
552
553 return 0;
554 }
555
556 static void sunxi_pinctrl_irq_mask_ack(struct irq_data *d)
557 {
558 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
559 u32 ctrl_reg = sunxi_irq_ctrl_reg(d->hwirq);
560 u8 ctrl_idx = sunxi_irq_ctrl_offset(d->hwirq);
561 u32 status_reg = sunxi_irq_status_reg(d->hwirq);
562 u8 status_idx = sunxi_irq_status_offset(d->hwirq);
563 u32 val;
564
565 /* Mask the IRQ */
566 val = readl(pctl->membase + ctrl_reg);
567 writel(val & ~(1 << ctrl_idx), pctl->membase + ctrl_reg);
568
569 /* Clear the IRQ */
570 writel(1 << status_idx, pctl->membase + status_reg);
571 }
572
573 static void sunxi_pinctrl_irq_mask(struct irq_data *d)
574 {
575 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
576 u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
577 u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
578 u32 val;
579
580 /* Mask the IRQ */
581 val = readl(pctl->membase + reg);
582 writel(val & ~(1 << idx), pctl->membase + reg);
583 }
584
585 static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
586 {
587 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
588 struct sunxi_desc_function *func;
589 u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
590 u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
591 u32 val;
592
593 func = sunxi_pinctrl_desc_find_function_by_pin(pctl,
594 pctl->irq_array[d->hwirq],
595 "irq");
596
597 /* Change muxing to INT mode */
598 sunxi_pmx_set(pctl->pctl_dev, pctl->irq_array[d->hwirq], func->muxval);
599
600 /* Unmask the IRQ */
601 val = readl(pctl->membase + reg);
602 writel(val | (1 << idx), pctl->membase + reg);
603 }
604
605 static struct irq_chip sunxi_pinctrl_irq_chip = {
606 .irq_mask = sunxi_pinctrl_irq_mask,
607 .irq_mask_ack = sunxi_pinctrl_irq_mask_ack,
608 .irq_unmask = sunxi_pinctrl_irq_unmask,
609 .irq_set_type = sunxi_pinctrl_irq_set_type,
610 };
611
612 static void sunxi_pinctrl_irq_handler(unsigned irq, struct irq_desc *desc)
613 {
614 struct sunxi_pinctrl *pctl = irq_get_handler_data(irq);
615 const unsigned long reg = readl(pctl->membase + IRQ_STATUS_REG);
616
617 /* Clear all interrupts */
618 writel(reg, pctl->membase + IRQ_STATUS_REG);
619
620 if (reg) {
621 int irqoffset;
622
623 for_each_set_bit(irqoffset, &reg, SUNXI_IRQ_NUMBER) {
624 int pin_irq = irq_find_mapping(pctl->domain, irqoffset);
625 generic_handle_irq(pin_irq);
626 }
627 }
628 }
629
630 static struct of_device_id sunxi_pinctrl_match[] = {
631 { .compatible = "allwinner,sun4i-a10-pinctrl", .data = (void *)&sun4i_a10_pinctrl_data },
632 { .compatible = "allwinner,sun5i-a10s-pinctrl", .data = (void *)&sun5i_a10s_pinctrl_data },
633 { .compatible = "allwinner,sun5i-a13-pinctrl", .data = (void *)&sun5i_a13_pinctrl_data },
634 {}
635 };
636 MODULE_DEVICE_TABLE(of, sunxi_pinctrl_match);
637
638 static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
639 const char *name)
640 {
641 struct sunxi_pinctrl_function *func = pctl->functions;
642
643 while (func->name) {
644 /* function already there */
645 if (strcmp(func->name, name) == 0) {
646 func->ngroups++;
647 return -EEXIST;
648 }
649 func++;
650 }
651
652 func->name = name;
653 func->ngroups = 1;
654
655 pctl->nfunctions++;
656
657 return 0;
658 }
659
660 static int sunxi_pinctrl_build_state(struct platform_device *pdev)
661 {
662 struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev);
663 int i;
664
665 pctl->ngroups = pctl->desc->npins;
666
667 /* Allocate groups */
668 pctl->groups = devm_kzalloc(&pdev->dev,
669 pctl->ngroups * sizeof(*pctl->groups),
670 GFP_KERNEL);
671 if (!pctl->groups)
672 return -ENOMEM;
673
674 for (i = 0; i < pctl->desc->npins; i++) {
675 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
676 struct sunxi_pinctrl_group *group = pctl->groups + i;
677
678 group->name = pin->pin.name;
679 group->pin = pin->pin.number;
680 }
681
682 /*
683 * We suppose that we won't have any more functions than pins,
684 * we'll reallocate that later anyway
685 */
686 pctl->functions = devm_kzalloc(&pdev->dev,
687 pctl->desc->npins * sizeof(*pctl->functions),
688 GFP_KERNEL);
689 if (!pctl->functions)
690 return -ENOMEM;
691
692 /* Count functions and their associated groups */
693 for (i = 0; i < pctl->desc->npins; i++) {
694 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
695 struct sunxi_desc_function *func = pin->functions;
696
697 while (func->name) {
698 sunxi_pinctrl_add_function(pctl, func->name);
699 func++;
700 }
701 }
702
703 pctl->functions = krealloc(pctl->functions,
704 pctl->nfunctions * sizeof(*pctl->functions),
705 GFP_KERNEL);
706
707 for (i = 0; i < pctl->desc->npins; i++) {
708 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
709 struct sunxi_desc_function *func = pin->functions;
710
711 while (func->name) {
712 struct sunxi_pinctrl_function *func_item;
713 const char **func_grp;
714
715 func_item = sunxi_pinctrl_find_function_by_name(pctl,
716 func->name);
717 if (!func_item)
718 return -EINVAL;
719
720 if (!func_item->groups) {
721 func_item->groups =
722 devm_kzalloc(&pdev->dev,
723 func_item->ngroups * sizeof(*func_item->groups),
724 GFP_KERNEL);
725 if (!func_item->groups)
726 return -ENOMEM;
727 }
728
729 func_grp = func_item->groups;
730 while (*func_grp)
731 func_grp++;
732
733 *func_grp = pin->pin.name;
734 func++;
735 }
736 }
737
738 return 0;
739 }
740
741 static int sunxi_pinctrl_probe(struct platform_device *pdev)
742 {
743 struct device_node *node = pdev->dev.of_node;
744 const struct of_device_id *device;
745 struct pinctrl_pin_desc *pins;
746 struct sunxi_pinctrl *pctl;
747 int i, ret, last_pin;
748 struct clk *clk;
749
750 pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
751 if (!pctl)
752 return -ENOMEM;
753 platform_set_drvdata(pdev, pctl);
754
755 pctl->membase = of_iomap(node, 0);
756 if (!pctl->membase)
757 return -ENOMEM;
758
759 device = of_match_device(sunxi_pinctrl_match, &pdev->dev);
760 if (!device)
761 return -ENODEV;
762
763 pctl->desc = (struct sunxi_pinctrl_desc *)device->data;
764
765 ret = sunxi_pinctrl_build_state(pdev);
766 if (ret) {
767 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
768 return ret;
769 }
770
771 pins = devm_kzalloc(&pdev->dev,
772 pctl->desc->npins * sizeof(*pins),
773 GFP_KERNEL);
774 if (!pins)
775 return -ENOMEM;
776
777 for (i = 0; i < pctl->desc->npins; i++)
778 pins[i] = pctl->desc->pins[i].pin;
779
780 sunxi_pctrl_desc.name = dev_name(&pdev->dev);
781 sunxi_pctrl_desc.owner = THIS_MODULE;
782 sunxi_pctrl_desc.pins = pins;
783 sunxi_pctrl_desc.npins = pctl->desc->npins;
784 pctl->dev = &pdev->dev;
785 pctl->pctl_dev = pinctrl_register(&sunxi_pctrl_desc,
786 &pdev->dev, pctl);
787 if (!pctl->pctl_dev) {
788 dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
789 return -EINVAL;
790 }
791
792 pctl->chip = devm_kzalloc(&pdev->dev, sizeof(*pctl->chip), GFP_KERNEL);
793 if (!pctl->chip) {
794 ret = -ENOMEM;
795 goto pinctrl_error;
796 }
797
798 last_pin = pctl->desc->pins[pctl->desc->npins - 1].pin.number;
799 pctl->chip = &sunxi_pinctrl_gpio_chip;
800 pctl->chip->ngpio = round_up(last_pin, PINS_PER_BANK);
801 pctl->chip->label = dev_name(&pdev->dev);
802 pctl->chip->dev = &pdev->dev;
803 pctl->chip->base = 0;
804
805 ret = gpiochip_add(pctl->chip);
806 if (ret)
807 goto pinctrl_error;
808
809 for (i = 0; i < pctl->desc->npins; i++) {
810 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
811
812 ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev),
813 pin->pin.number,
814 pin->pin.number, 1);
815 if (ret)
816 goto gpiochip_error;
817 }
818
819 clk = devm_clk_get(&pdev->dev, NULL);
820 if (IS_ERR(clk)) {
821 ret = PTR_ERR(clk);
822 goto gpiochip_error;
823 }
824
825 clk_prepare_enable(clk);
826
827 pctl->irq = irq_of_parse_and_map(node, 0);
828 if (!pctl->irq) {
829 ret = -EINVAL;
830 goto gpiochip_error;
831 }
832
833 pctl->domain = irq_domain_add_linear(node, SUNXI_IRQ_NUMBER,
834 &irq_domain_simple_ops, NULL);
835 if (!pctl->domain) {
836 dev_err(&pdev->dev, "Couldn't register IRQ domain\n");
837 ret = -ENOMEM;
838 goto gpiochip_error;
839 }
840
841 for (i = 0; i < SUNXI_IRQ_NUMBER; i++) {
842 int irqno = irq_create_mapping(pctl->domain, i);
843
844 irq_set_chip_and_handler(irqno, &sunxi_pinctrl_irq_chip,
845 handle_simple_irq);
846 irq_set_chip_data(irqno, pctl);
847 };
848
849 irq_set_chained_handler(pctl->irq, sunxi_pinctrl_irq_handler);
850 irq_set_handler_data(pctl->irq, pctl);
851
852 dev_info(&pdev->dev, "initialized sunXi PIO driver\n");
853
854 return 0;
855
856 gpiochip_error:
857 if (gpiochip_remove(pctl->chip))
858 dev_err(&pdev->dev, "failed to remove gpio chip\n");
859 pinctrl_error:
860 pinctrl_unregister(pctl->pctl_dev);
861 return ret;
862 }
863
864 static struct platform_driver sunxi_pinctrl_driver = {
865 .probe = sunxi_pinctrl_probe,
866 .driver = {
867 .name = "sunxi-pinctrl",
868 .owner = THIS_MODULE,
869 .of_match_table = sunxi_pinctrl_match,
870 },
871 };
872 module_platform_driver(sunxi_pinctrl_driver);
873
874 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com");
875 MODULE_DESCRIPTION("Allwinner A1X pinctrl driver");
876 MODULE_LICENSE("GPL");
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