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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.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.h>
16 #include <linux/irqdomain.h>
17 #include <linux/irqchip/chained_irq.h>
18 #include <linux/module.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_request(struct gpio_chip *chip, unsigned offset)
450 {
451 return pinctrl_request_gpio(chip->base + offset);
452 }
453
454 static void sunxi_pinctrl_gpio_free(struct gpio_chip *chip, unsigned offset)
455 {
456 pinctrl_free_gpio(chip->base + offset);
457 }
458
459 static int sunxi_pinctrl_gpio_direction_input(struct gpio_chip *chip,
460 unsigned offset)
461 {
462 return pinctrl_gpio_direction_input(chip->base + offset);
463 }
464
465 static int sunxi_pinctrl_gpio_get(struct gpio_chip *chip, unsigned offset)
466 {
467 struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
468 u32 reg = sunxi_data_reg(offset);
469 u8 index = sunxi_data_offset(offset);
470 u32 set_mux = pctl->desc->irq_read_needs_mux &&
471 test_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags);
472 u32 val;
473
474 if (set_mux)
475 sunxi_pmx_set(pctl->pctl_dev, offset, SUN4I_FUNC_INPUT);
476
477 val = (readl(pctl->membase + reg) >> index) & DATA_PINS_MASK;
478
479 if (set_mux)
480 sunxi_pmx_set(pctl->pctl_dev, offset, SUN4I_FUNC_IRQ);
481
482 return val;
483 }
484
485 static void sunxi_pinctrl_gpio_set(struct gpio_chip *chip,
486 unsigned offset, int value)
487 {
488 struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
489 u32 reg = sunxi_data_reg(offset);
490 u8 index = sunxi_data_offset(offset);
491 unsigned long flags;
492 u32 regval;
493
494 spin_lock_irqsave(&pctl->lock, flags);
495
496 regval = readl(pctl->membase + reg);
497
498 if (value)
499 regval |= BIT(index);
500 else
501 regval &= ~(BIT(index));
502
503 writel(regval, pctl->membase + reg);
504
505 spin_unlock_irqrestore(&pctl->lock, flags);
506 }
507
508 static int sunxi_pinctrl_gpio_direction_output(struct gpio_chip *chip,
509 unsigned offset, int value)
510 {
511 sunxi_pinctrl_gpio_set(chip, offset, value);
512 return pinctrl_gpio_direction_output(chip->base + offset);
513 }
514
515 static int sunxi_pinctrl_gpio_of_xlate(struct gpio_chip *gc,
516 const struct of_phandle_args *gpiospec,
517 u32 *flags)
518 {
519 int pin, base;
520
521 base = PINS_PER_BANK * gpiospec->args[0];
522 pin = base + gpiospec->args[1];
523
524 if (pin > gc->ngpio)
525 return -EINVAL;
526
527 if (flags)
528 *flags = gpiospec->args[2];
529
530 return pin;
531 }
532
533 static int sunxi_pinctrl_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
534 {
535 struct sunxi_pinctrl *pctl = dev_get_drvdata(chip->dev);
536 struct sunxi_desc_function *desc;
537 unsigned pinnum = pctl->desc->pin_base + offset;
538 unsigned irqnum;
539
540 if (offset >= chip->ngpio)
541 return -ENXIO;
542
543 desc = sunxi_pinctrl_desc_find_function_by_pin(pctl, pinnum, "irq");
544 if (!desc)
545 return -EINVAL;
546
547 irqnum = desc->irqbank * IRQ_PER_BANK + desc->irqnum;
548
549 dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
550 chip->label, offset + chip->base, irqnum);
551
552 return irq_find_mapping(pctl->domain, irqnum);
553 }
554
555 static int sunxi_pinctrl_irq_request_resources(struct irq_data *d)
556 {
557 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
558 struct sunxi_desc_function *func;
559 int ret;
560
561 func = sunxi_pinctrl_desc_find_function_by_pin(pctl,
562 pctl->irq_array[d->hwirq], "irq");
563 if (!func)
564 return -EINVAL;
565
566 ret = gpiochip_lock_as_irq(pctl->chip,
567 pctl->irq_array[d->hwirq] - pctl->desc->pin_base);
568 if (ret) {
569 dev_err(pctl->dev, "unable to lock HW IRQ %lu for IRQ\n",
570 irqd_to_hwirq(d));
571 return ret;
572 }
573
574 /* Change muxing to INT mode */
575 sunxi_pmx_set(pctl->pctl_dev, pctl->irq_array[d->hwirq], func->muxval);
576
577 return 0;
578 }
579
580 static void sunxi_pinctrl_irq_release_resources(struct irq_data *d)
581 {
582 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
583
584 gpiochip_unlock_as_irq(pctl->chip,
585 pctl->irq_array[d->hwirq] - pctl->desc->pin_base);
586 }
587
588 static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type)
589 {
590 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
591 struct irq_desc *desc = container_of(d, struct irq_desc, irq_data);
592 u32 reg = sunxi_irq_cfg_reg(d->hwirq);
593 u8 index = sunxi_irq_cfg_offset(d->hwirq);
594 unsigned long flags;
595 u32 regval;
596 u8 mode;
597
598 switch (type) {
599 case IRQ_TYPE_EDGE_RISING:
600 mode = IRQ_EDGE_RISING;
601 break;
602 case IRQ_TYPE_EDGE_FALLING:
603 mode = IRQ_EDGE_FALLING;
604 break;
605 case IRQ_TYPE_EDGE_BOTH:
606 mode = IRQ_EDGE_BOTH;
607 break;
608 case IRQ_TYPE_LEVEL_HIGH:
609 mode = IRQ_LEVEL_HIGH;
610 break;
611 case IRQ_TYPE_LEVEL_LOW:
612 mode = IRQ_LEVEL_LOW;
613 break;
614 default:
615 return -EINVAL;
616 }
617
618 if (type & IRQ_TYPE_LEVEL_MASK) {
619 d->chip = &sunxi_pinctrl_level_irq_chip;
620 desc->handle_irq = handle_fasteoi_irq;
621 } else {
622 d->chip = &sunxi_pinctrl_edge_irq_chip;
623 desc->handle_irq = handle_edge_irq;
624 }
625
626 spin_lock_irqsave(&pctl->lock, flags);
627
628 regval = readl(pctl->membase + reg);
629 regval &= ~(IRQ_CFG_IRQ_MASK << index);
630 writel(regval | (mode << index), pctl->membase + reg);
631
632 spin_unlock_irqrestore(&pctl->lock, flags);
633
634 return 0;
635 }
636
637 static void sunxi_pinctrl_irq_ack(struct irq_data *d)
638 {
639 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
640 u32 status_reg = sunxi_irq_status_reg(d->hwirq);
641 u8 status_idx = sunxi_irq_status_offset(d->hwirq);
642
643 /* Clear the IRQ */
644 writel(1 << status_idx, pctl->membase + status_reg);
645 }
646
647 static void sunxi_pinctrl_irq_mask(struct irq_data *d)
648 {
649 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
650 u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
651 u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
652 unsigned long flags;
653 u32 val;
654
655 spin_lock_irqsave(&pctl->lock, flags);
656
657 /* Mask the IRQ */
658 val = readl(pctl->membase + reg);
659 writel(val & ~(1 << idx), pctl->membase + reg);
660
661 spin_unlock_irqrestore(&pctl->lock, flags);
662 }
663
664 static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
665 {
666 struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
667 u32 reg = sunxi_irq_ctrl_reg(d->hwirq);
668 u8 idx = sunxi_irq_ctrl_offset(d->hwirq);
669 unsigned long flags;
670 u32 val;
671
672 spin_lock_irqsave(&pctl->lock, flags);
673
674 /* Unmask the IRQ */
675 val = readl(pctl->membase + reg);
676 writel(val | (1 << idx), pctl->membase + reg);
677
678 spin_unlock_irqrestore(&pctl->lock, flags);
679 }
680
681 static void sunxi_pinctrl_irq_ack_unmask(struct irq_data *d)
682 {
683 sunxi_pinctrl_irq_ack(d);
684 sunxi_pinctrl_irq_unmask(d);
685 }
686
687 static struct irq_chip sunxi_pinctrl_edge_irq_chip = {
688 .irq_ack = sunxi_pinctrl_irq_ack,
689 .irq_mask = sunxi_pinctrl_irq_mask,
690 .irq_unmask = sunxi_pinctrl_irq_unmask,
691 .irq_request_resources = sunxi_pinctrl_irq_request_resources,
692 .irq_release_resources = sunxi_pinctrl_irq_release_resources,
693 .irq_set_type = sunxi_pinctrl_irq_set_type,
694 .flags = IRQCHIP_SKIP_SET_WAKE,
695 };
696
697 static struct irq_chip sunxi_pinctrl_level_irq_chip = {
698 .irq_eoi = sunxi_pinctrl_irq_ack,
699 .irq_mask = sunxi_pinctrl_irq_mask,
700 .irq_unmask = sunxi_pinctrl_irq_unmask,
701 /* Define irq_enable / disable to avoid spurious irqs for drivers
702 * using these to suppress irqs while they clear the irq source */
703 .irq_enable = sunxi_pinctrl_irq_ack_unmask,
704 .irq_disable = sunxi_pinctrl_irq_mask,
705 .irq_request_resources = sunxi_pinctrl_irq_request_resources,
706 .irq_release_resources = sunxi_pinctrl_irq_release_resources,
707 .irq_set_type = sunxi_pinctrl_irq_set_type,
708 .flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED |
709 IRQCHIP_EOI_IF_HANDLED,
710 };
711
712 static void sunxi_pinctrl_irq_handler(unsigned irq, struct irq_desc *desc)
713 {
714 struct irq_chip *chip = irq_get_chip(irq);
715 struct sunxi_pinctrl *pctl = irq_get_handler_data(irq);
716 unsigned long bank, reg, val;
717
718 for (bank = 0; bank < pctl->desc->irq_banks; bank++)
719 if (irq == pctl->irq[bank])
720 break;
721
722 if (bank == pctl->desc->irq_banks)
723 return;
724
725 reg = sunxi_irq_status_reg_from_bank(bank);
726 val = readl(pctl->membase + reg);
727
728 if (val) {
729 int irqoffset;
730
731 chained_irq_enter(chip, desc);
732 for_each_set_bit(irqoffset, &val, IRQ_PER_BANK) {
733 int pin_irq = irq_find_mapping(pctl->domain,
734 bank * IRQ_PER_BANK + irqoffset);
735 generic_handle_irq(pin_irq);
736 }
737 chained_irq_exit(chip, desc);
738 }
739 }
740
741 static int sunxi_pinctrl_add_function(struct sunxi_pinctrl *pctl,
742 const char *name)
743 {
744 struct sunxi_pinctrl_function *func = pctl->functions;
745
746 while (func->name) {
747 /* function already there */
748 if (strcmp(func->name, name) == 0) {
749 func->ngroups++;
750 return -EEXIST;
751 }
752 func++;
753 }
754
755 func->name = name;
756 func->ngroups = 1;
757
758 pctl->nfunctions++;
759
760 return 0;
761 }
762
763 static int sunxi_pinctrl_build_state(struct platform_device *pdev)
764 {
765 struct sunxi_pinctrl *pctl = platform_get_drvdata(pdev);
766 int i;
767
768 pctl->ngroups = pctl->desc->npins;
769
770 /* Allocate groups */
771 pctl->groups = devm_kzalloc(&pdev->dev,
772 pctl->ngroups * sizeof(*pctl->groups),
773 GFP_KERNEL);
774 if (!pctl->groups)
775 return -ENOMEM;
776
777 for (i = 0; i < pctl->desc->npins; i++) {
778 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
779 struct sunxi_pinctrl_group *group = pctl->groups + i;
780
781 group->name = pin->pin.name;
782 group->pin = pin->pin.number;
783 }
784
785 /*
786 * We suppose that we won't have any more functions than pins,
787 * we'll reallocate that later anyway
788 */
789 pctl->functions = devm_kzalloc(&pdev->dev,
790 pctl->desc->npins * sizeof(*pctl->functions),
791 GFP_KERNEL);
792 if (!pctl->functions)
793 return -ENOMEM;
794
795 /* Count functions and their associated groups */
796 for (i = 0; i < pctl->desc->npins; i++) {
797 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
798 struct sunxi_desc_function *func = pin->functions;
799
800 while (func->name) {
801 /* Create interrupt mapping while we're at it */
802 if (!strcmp(func->name, "irq")) {
803 int irqnum = func->irqnum + func->irqbank * IRQ_PER_BANK;
804 pctl->irq_array[irqnum] = pin->pin.number;
805 }
806
807 sunxi_pinctrl_add_function(pctl, func->name);
808 func++;
809 }
810 }
811
812 pctl->functions = krealloc(pctl->functions,
813 pctl->nfunctions * sizeof(*pctl->functions),
814 GFP_KERNEL);
815
816 for (i = 0; i < pctl->desc->npins; i++) {
817 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
818 struct sunxi_desc_function *func = pin->functions;
819
820 while (func->name) {
821 struct sunxi_pinctrl_function *func_item;
822 const char **func_grp;
823
824 func_item = sunxi_pinctrl_find_function_by_name(pctl,
825 func->name);
826 if (!func_item)
827 return -EINVAL;
828
829 if (!func_item->groups) {
830 func_item->groups =
831 devm_kzalloc(&pdev->dev,
832 func_item->ngroups * sizeof(*func_item->groups),
833 GFP_KERNEL);
834 if (!func_item->groups)
835 return -ENOMEM;
836 }
837
838 func_grp = func_item->groups;
839 while (*func_grp)
840 func_grp++;
841
842 *func_grp = pin->pin.name;
843 func++;
844 }
845 }
846
847 return 0;
848 }
849
850 int sunxi_pinctrl_init(struct platform_device *pdev,
851 const struct sunxi_pinctrl_desc *desc)
852 {
853 struct device_node *node = pdev->dev.of_node;
854 struct pinctrl_desc *pctrl_desc;
855 struct pinctrl_pin_desc *pins;
856 struct sunxi_pinctrl *pctl;
857 struct resource *res;
858 int i, ret, last_pin;
859 struct clk *clk;
860
861 pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
862 if (!pctl)
863 return -ENOMEM;
864 platform_set_drvdata(pdev, pctl);
865
866 spin_lock_init(&pctl->lock);
867
868 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
869 pctl->membase = devm_ioremap_resource(&pdev->dev, res);
870 if (IS_ERR(pctl->membase))
871 return PTR_ERR(pctl->membase);
872
873 pctl->dev = &pdev->dev;
874 pctl->desc = desc;
875
876 pctl->irq_array = devm_kcalloc(&pdev->dev,
877 IRQ_PER_BANK * pctl->desc->irq_banks,
878 sizeof(*pctl->irq_array),
879 GFP_KERNEL);
880 if (!pctl->irq_array)
881 return -ENOMEM;
882
883 ret = sunxi_pinctrl_build_state(pdev);
884 if (ret) {
885 dev_err(&pdev->dev, "dt probe failed: %d\n", ret);
886 return ret;
887 }
888
889 pins = devm_kzalloc(&pdev->dev,
890 pctl->desc->npins * sizeof(*pins),
891 GFP_KERNEL);
892 if (!pins)
893 return -ENOMEM;
894
895 for (i = 0; i < pctl->desc->npins; i++)
896 pins[i] = pctl->desc->pins[i].pin;
897
898 pctrl_desc = devm_kzalloc(&pdev->dev,
899 sizeof(*pctrl_desc),
900 GFP_KERNEL);
901 if (!pctrl_desc)
902 return -ENOMEM;
903
904 pctrl_desc->name = dev_name(&pdev->dev);
905 pctrl_desc->owner = THIS_MODULE;
906 pctrl_desc->pins = pins;
907 pctrl_desc->npins = pctl->desc->npins;
908 pctrl_desc->confops = &sunxi_pconf_ops;
909 pctrl_desc->pctlops = &sunxi_pctrl_ops;
910 pctrl_desc->pmxops = &sunxi_pmx_ops;
911
912 pctl->pctl_dev = pinctrl_register(pctrl_desc,
913 &pdev->dev, pctl);
914 if (IS_ERR(pctl->pctl_dev)) {
915 dev_err(&pdev->dev, "couldn't register pinctrl driver\n");
916 return PTR_ERR(pctl->pctl_dev);
917 }
918
919 pctl->chip = devm_kzalloc(&pdev->dev, sizeof(*pctl->chip), GFP_KERNEL);
920 if (!pctl->chip) {
921 ret = -ENOMEM;
922 goto pinctrl_error;
923 }
924
925 last_pin = pctl->desc->pins[pctl->desc->npins - 1].pin.number;
926 pctl->chip->owner = THIS_MODULE;
927 pctl->chip->request = sunxi_pinctrl_gpio_request,
928 pctl->chip->free = sunxi_pinctrl_gpio_free,
929 pctl->chip->direction_input = sunxi_pinctrl_gpio_direction_input,
930 pctl->chip->direction_output = sunxi_pinctrl_gpio_direction_output,
931 pctl->chip->get = sunxi_pinctrl_gpio_get,
932 pctl->chip->set = sunxi_pinctrl_gpio_set,
933 pctl->chip->of_xlate = sunxi_pinctrl_gpio_of_xlate,
934 pctl->chip->to_irq = sunxi_pinctrl_gpio_to_irq,
935 pctl->chip->of_gpio_n_cells = 3,
936 pctl->chip->can_sleep = false,
937 pctl->chip->ngpio = round_up(last_pin, PINS_PER_BANK) -
938 pctl->desc->pin_base;
939 pctl->chip->label = dev_name(&pdev->dev);
940 pctl->chip->dev = &pdev->dev;
941 pctl->chip->base = pctl->desc->pin_base;
942
943 ret = gpiochip_add(pctl->chip);
944 if (ret)
945 goto pinctrl_error;
946
947 for (i = 0; i < pctl->desc->npins; i++) {
948 const struct sunxi_desc_pin *pin = pctl->desc->pins + i;
949
950 ret = gpiochip_add_pin_range(pctl->chip, dev_name(&pdev->dev),
951 pin->pin.number - pctl->desc->pin_base,
952 pin->pin.number, 1);
953 if (ret)
954 goto gpiochip_error;
955 }
956
957 clk = devm_clk_get(&pdev->dev, NULL);
958 if (IS_ERR(clk)) {
959 ret = PTR_ERR(clk);
960 goto gpiochip_error;
961 }
962
963 ret = clk_prepare_enable(clk);
964 if (ret)
965 goto gpiochip_error;
966
967 pctl->irq = devm_kcalloc(&pdev->dev,
968 pctl->desc->irq_banks,
969 sizeof(*pctl->irq),
970 GFP_KERNEL);
971 if (!pctl->irq) {
972 ret = -ENOMEM;
973 goto clk_error;
974 }
975
976 for (i = 0; i < pctl->desc->irq_banks; i++) {
977 pctl->irq[i] = platform_get_irq(pdev, i);
978 if (pctl->irq[i] < 0) {
979 ret = pctl->irq[i];
980 goto clk_error;
981 }
982 }
983
984 pctl->domain = irq_domain_add_linear(node,
985 pctl->desc->irq_banks * IRQ_PER_BANK,
986 &irq_domain_simple_ops,
987 NULL);
988 if (!pctl->domain) {
989 dev_err(&pdev->dev, "Couldn't register IRQ domain\n");
990 ret = -ENOMEM;
991 goto clk_error;
992 }
993
994 for (i = 0; i < (pctl->desc->irq_banks * IRQ_PER_BANK); i++) {
995 int irqno = irq_create_mapping(pctl->domain, i);
996
997 irq_set_chip_and_handler(irqno, &sunxi_pinctrl_edge_irq_chip,
998 handle_edge_irq);
999 irq_set_chip_data(irqno, pctl);
1000 };
1001
1002 for (i = 0; i < pctl->desc->irq_banks; i++) {
1003 /* Mask and clear all IRQs before registering a handler */
1004 writel(0, pctl->membase + sunxi_irq_ctrl_reg_from_bank(i));
1005 writel(0xffffffff,
1006 pctl->membase + sunxi_irq_status_reg_from_bank(i));
1007
1008 irq_set_chained_handler_and_data(pctl->irq[i],
1009 sunxi_pinctrl_irq_handler,
1010 pctl);
1011 }
1012
1013 dev_info(&pdev->dev, "initialized sunXi PIO driver\n");
1014
1015 return 0;
1016
1017 clk_error:
1018 clk_disable_unprepare(clk);
1019 gpiochip_error:
1020 gpiochip_remove(pctl->chip);
1021 pinctrl_error:
1022 pinctrl_unregister(pctl->pctl_dev);
1023 return ret;
1024 }
Linux kernel - Deliverables
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