1
2
3
4
5
6
7
8
9#include <dt-bindings/pinctrl/at91.h>
10#include <linux/clk.h>
11#include <linux/gpio/driver.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/init.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/pinctrl/pinconf.h>
18#include <linux/pinctrl/pinconf-generic.h>
19#include <linux/pinctrl/pinctrl.h>
20#include <linux/pinctrl/pinmux.h>
21#include <linux/slab.h>
22#include "core.h"
23#include "pinconf.h"
24#include "pinctrl-utils.h"
25
26
27
28
29
30
31
32
33#define ATMEL_PIO_MSKR 0x0000
34#define ATMEL_PIO_CFGR 0x0004
35#define ATMEL_PIO_CFGR_FUNC_MASK GENMASK(2, 0)
36#define ATMEL_PIO_DIR_MASK BIT(8)
37#define ATMEL_PIO_PUEN_MASK BIT(9)
38#define ATMEL_PIO_PDEN_MASK BIT(10)
39#define ATMEL_PIO_IFEN_MASK BIT(12)
40#define ATMEL_PIO_IFSCEN_MASK BIT(13)
41#define ATMEL_PIO_OPD_MASK BIT(14)
42#define ATMEL_PIO_SCHMITT_MASK BIT(15)
43#define ATMEL_PIO_DRVSTR_MASK GENMASK(17, 16)
44#define ATMEL_PIO_DRVSTR_OFFSET 16
45#define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26, 24)
46#define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24)
47#define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24)
48#define ATMEL_PIO_CFGR_EVTSEL_BOTH (2 << 24)
49#define ATMEL_PIO_CFGR_EVTSEL_LOW (3 << 24)
50#define ATMEL_PIO_CFGR_EVTSEL_HIGH (4 << 24)
51#define ATMEL_PIO_PDSR 0x0008
52#define ATMEL_PIO_LOCKSR 0x000C
53#define ATMEL_PIO_SODR 0x0010
54#define ATMEL_PIO_CODR 0x0014
55#define ATMEL_PIO_ODSR 0x0018
56#define ATMEL_PIO_IER 0x0020
57#define ATMEL_PIO_IDR 0x0024
58#define ATMEL_PIO_IMR 0x0028
59#define ATMEL_PIO_ISR 0x002C
60#define ATMEL_PIO_IOFR 0x003C
61
62#define ATMEL_PIO_NPINS_PER_BANK 32
63#define ATMEL_PIO_BANK(pin_id) (pin_id / ATMEL_PIO_NPINS_PER_BANK)
64#define ATMEL_PIO_LINE(pin_id) (pin_id % ATMEL_PIO_NPINS_PER_BANK)
65#define ATMEL_PIO_BANK_OFFSET 0x40
66
67#define ATMEL_GET_PIN_NO(pinfunc) ((pinfunc) & 0xff)
68#define ATMEL_GET_PIN_FUNC(pinfunc) ((pinfunc >> 16) & 0xf)
69#define ATMEL_GET_PIN_IOSET(pinfunc) ((pinfunc >> 20) & 0xf)
70
71
72#define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1)
73
74struct atmel_pioctrl_data {
75 unsigned nbanks;
76};
77
78struct atmel_group {
79 const char *name;
80 u32 pin;
81};
82
83struct atmel_pin {
84 unsigned pin_id;
85 unsigned mux;
86 unsigned ioset;
87 unsigned bank;
88 unsigned line;
89 const char *device;
90};
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112struct atmel_pioctrl {
113 void __iomem *reg_base;
114 struct clk *clk;
115 unsigned nbanks;
116 struct pinctrl_dev *pinctrl_dev;
117 struct atmel_group *groups;
118 const char * const *group_names;
119 struct atmel_pin **pins;
120 unsigned npins;
121 struct gpio_chip *gpio_chip;
122 struct irq_domain *irq_domain;
123 int *irqs;
124 unsigned *pm_wakeup_sources;
125 struct {
126 u32 imr;
127 u32 odsr;
128 u32 cfgr[ATMEL_PIO_NPINS_PER_BANK];
129 } *pm_suspend_backup;
130 struct device *dev;
131 struct device_node *node;
132};
133
134static const char * const atmel_functions[] = {
135 "GPIO", "A", "B", "C", "D", "E", "F", "G"
136};
137
138static const struct pinconf_generic_params atmel_custom_bindings[] = {
139 {"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0},
140};
141
142
143static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
144 unsigned int bank, unsigned int reg)
145{
146 return readl_relaxed(atmel_pioctrl->reg_base
147 + ATMEL_PIO_BANK_OFFSET * bank + reg);
148}
149
150static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
151 unsigned int bank, unsigned int reg,
152 unsigned int val)
153{
154 writel_relaxed(val, atmel_pioctrl->reg_base
155 + ATMEL_PIO_BANK_OFFSET * bank + reg);
156}
157
158static void atmel_gpio_irq_ack(struct irq_data *d)
159{
160
161
162
163
164}
165
166static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned type)
167{
168 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
169 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
170 unsigned reg;
171
172 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
173 BIT(pin->line));
174 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
175 reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
176
177 switch (type) {
178 case IRQ_TYPE_EDGE_RISING:
179 irq_set_handler_locked(d, handle_edge_irq);
180 reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
181 break;
182 case IRQ_TYPE_EDGE_FALLING:
183 irq_set_handler_locked(d, handle_edge_irq);
184 reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
185 break;
186 case IRQ_TYPE_EDGE_BOTH:
187 irq_set_handler_locked(d, handle_edge_irq);
188 reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
189 break;
190 case IRQ_TYPE_LEVEL_LOW:
191 irq_set_handler_locked(d, handle_level_irq);
192 reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
193 break;
194 case IRQ_TYPE_LEVEL_HIGH:
195 irq_set_handler_locked(d, handle_level_irq);
196 reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
197 break;
198 case IRQ_TYPE_NONE:
199 default:
200 return -EINVAL;
201 }
202
203 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
204
205 return 0;
206}
207
208static void atmel_gpio_irq_mask(struct irq_data *d)
209{
210 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
211 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
212
213 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
214 BIT(pin->line));
215}
216
217static void atmel_gpio_irq_unmask(struct irq_data *d)
218{
219 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
220 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
221
222 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
223 BIT(pin->line));
224}
225
226#ifdef CONFIG_PM_SLEEP
227
228static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
229{
230 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
231 int bank = ATMEL_PIO_BANK(d->hwirq);
232 int line = ATMEL_PIO_LINE(d->hwirq);
233
234
235 irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
236
237 if (on)
238 atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
239 else
240 atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
241
242 return 0;
243}
244#else
245#define atmel_gpio_irq_set_wake NULL
246#endif
247
248static struct irq_chip atmel_gpio_irq_chip = {
249 .name = "GPIO",
250 .irq_ack = atmel_gpio_irq_ack,
251 .irq_mask = atmel_gpio_irq_mask,
252 .irq_unmask = atmel_gpio_irq_unmask,
253 .irq_set_type = atmel_gpio_irq_set_type,
254 .irq_set_wake = atmel_gpio_irq_set_wake,
255};
256
257static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
258{
259 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
260
261 return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
262}
263
264static void atmel_gpio_irq_handler(struct irq_desc *desc)
265{
266 unsigned int irq = irq_desc_get_irq(desc);
267 struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
268 struct irq_chip *chip = irq_desc_get_chip(desc);
269 unsigned long isr;
270 int n, bank = -1;
271
272
273 for (n = 0; n < atmel_pioctrl->nbanks; n++) {
274 if (atmel_pioctrl->irqs[n] == irq) {
275 bank = n;
276 break;
277 }
278 }
279
280 if (bank < 0) {
281 dev_err(atmel_pioctrl->dev,
282 "no bank associated to irq %u\n", irq);
283 return;
284 }
285
286 chained_irq_enter(chip, desc);
287
288 for (;;) {
289 isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
290 ATMEL_PIO_ISR);
291 isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
292 ATMEL_PIO_IMR);
293 if (!isr)
294 break;
295
296 for_each_set_bit(n, &isr, BITS_PER_LONG)
297 generic_handle_irq(atmel_gpio_to_irq(
298 atmel_pioctrl->gpio_chip,
299 bank * ATMEL_PIO_NPINS_PER_BANK + n));
300 }
301
302 chained_irq_exit(chip, desc);
303}
304
305static int atmel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
306{
307 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
308 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
309 unsigned reg;
310
311 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
312 BIT(pin->line));
313 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
314 reg &= ~ATMEL_PIO_DIR_MASK;
315 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
316
317 return 0;
318}
319
320static int atmel_gpio_get(struct gpio_chip *chip, unsigned offset)
321{
322 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
323 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
324 unsigned reg;
325
326 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
327
328 return !!(reg & BIT(pin->line));
329}
330
331static int atmel_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
332 int value)
333{
334 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
335 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
336 unsigned reg;
337
338 atmel_gpio_write(atmel_pioctrl, pin->bank,
339 value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
340 BIT(pin->line));
341
342 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
343 BIT(pin->line));
344 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
345 reg |= ATMEL_PIO_DIR_MASK;
346 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
347
348 return 0;
349}
350
351static void atmel_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
352{
353 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
354 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
355
356 atmel_gpio_write(atmel_pioctrl, pin->bank,
357 val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
358 BIT(pin->line));
359}
360
361static struct gpio_chip atmel_gpio_chip = {
362 .direction_input = atmel_gpio_direction_input,
363 .get = atmel_gpio_get,
364 .direction_output = atmel_gpio_direction_output,
365 .set = atmel_gpio_set,
366 .to_irq = atmel_gpio_to_irq,
367 .base = 0,
368};
369
370
371static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
372 unsigned pin_id)
373{
374 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
375 unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
376 unsigned line = atmel_pioctrl->pins[pin_id]->line;
377 void __iomem *addr = atmel_pioctrl->reg_base
378 + bank * ATMEL_PIO_BANK_OFFSET;
379
380 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
381
382 wmb();
383
384 return readl_relaxed(addr + ATMEL_PIO_CFGR);
385}
386
387static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
388 unsigned pin_id, u32 conf)
389{
390 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
391 unsigned bank = atmel_pioctrl->pins[pin_id]->bank;
392 unsigned line = atmel_pioctrl->pins[pin_id]->line;
393 void __iomem *addr = atmel_pioctrl->reg_base
394 + bank * ATMEL_PIO_BANK_OFFSET;
395
396 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
397
398 wmb();
399 writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
400}
401
402static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
403{
404 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
405
406 return atmel_pioctrl->npins;
407}
408
409static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
410 unsigned selector)
411{
412 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
413
414 return atmel_pioctrl->groups[selector].name;
415}
416
417static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
418 unsigned selector, const unsigned **pins,
419 unsigned *num_pins)
420{
421 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
422
423 *pins = (unsigned *)&atmel_pioctrl->groups[selector].pin;
424 *num_pins = 1;
425
426 return 0;
427}
428
429static struct atmel_group *
430atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned pin)
431{
432 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
433 int i;
434
435 for (i = 0; i < atmel_pioctrl->npins; i++) {
436 struct atmel_group *grp = atmel_pioctrl->groups + i;
437
438 if (grp->pin == pin)
439 return grp;
440 }
441
442 return NULL;
443}
444
445static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
446 struct device_node *np,
447 u32 pinfunc, const char **grp_name,
448 const char **func_name)
449{
450 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
451 unsigned pin_id, func_id;
452 struct atmel_group *grp;
453
454 pin_id = ATMEL_GET_PIN_NO(pinfunc);
455 func_id = ATMEL_GET_PIN_FUNC(pinfunc);
456
457 if (func_id >= ARRAY_SIZE(atmel_functions))
458 return -EINVAL;
459
460 *func_name = atmel_functions[func_id];
461
462 grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
463 if (!grp)
464 return -EINVAL;
465 *grp_name = grp->name;
466
467 atmel_pioctrl->pins[pin_id]->mux = func_id;
468 atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
469
470 if (np->parent == atmel_pioctrl->node)
471 atmel_pioctrl->pins[pin_id]->device = np->name;
472 else
473 atmel_pioctrl->pins[pin_id]->device = np->parent->name;
474
475 return 0;
476}
477
478static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
479 struct device_node *np,
480 struct pinctrl_map **map,
481 unsigned *reserved_maps,
482 unsigned *num_maps)
483{
484 unsigned num_pins, num_configs, reserve;
485 unsigned long *configs;
486 struct property *pins;
487 u32 pinfunc;
488 int ret, i;
489
490 pins = of_find_property(np, "pinmux", NULL);
491 if (!pins)
492 return -EINVAL;
493
494 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
495 &num_configs);
496 if (ret < 0) {
497 dev_err(pctldev->dev, "%pOF: could not parse node property\n",
498 np);
499 return ret;
500 }
501
502 num_pins = pins->length / sizeof(u32);
503 if (!num_pins) {
504 dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
505 ret = -EINVAL;
506 goto exit;
507 }
508
509
510
511
512
513 reserve = 1;
514 if (num_configs)
515 reserve++;
516 reserve *= num_pins;
517 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
518 reserve);
519 if (ret < 0)
520 goto exit;
521
522 for (i = 0; i < num_pins; i++) {
523 const char *group, *func;
524
525 ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
526 if (ret)
527 goto exit;
528
529 ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
530 &func);
531 if (ret)
532 goto exit;
533
534 pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
535 group, func);
536
537 if (num_configs) {
538 ret = pinctrl_utils_add_map_configs(pctldev, map,
539 reserved_maps, num_maps, group,
540 configs, num_configs,
541 PIN_MAP_TYPE_CONFIGS_GROUP);
542 if (ret < 0)
543 goto exit;
544 }
545 }
546
547exit:
548 kfree(configs);
549 return ret;
550}
551
552static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
553 struct device_node *np_config,
554 struct pinctrl_map **map,
555 unsigned *num_maps)
556{
557 struct device_node *np;
558 unsigned reserved_maps;
559 int ret;
560
561 *map = NULL;
562 *num_maps = 0;
563 reserved_maps = 0;
564
565
566
567
568
569
570 ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
571 &reserved_maps, num_maps);
572 if (ret) {
573 for_each_child_of_node(np_config, np) {
574 ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
575 &reserved_maps, num_maps);
576 if (ret < 0) {
577 of_node_put(np);
578 break;
579 }
580 }
581 }
582
583 if (ret < 0) {
584 pinctrl_utils_free_map(pctldev, *map, *num_maps);
585 dev_err(pctldev->dev, "can't create maps for node %pOF\n",
586 np_config);
587 }
588
589 return ret;
590}
591
592static const struct pinctrl_ops atmel_pctlops = {
593 .get_groups_count = atmel_pctl_get_groups_count,
594 .get_group_name = atmel_pctl_get_group_name,
595 .get_group_pins = atmel_pctl_get_group_pins,
596 .dt_node_to_map = atmel_pctl_dt_node_to_map,
597 .dt_free_map = pinctrl_utils_free_map,
598};
599
600static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
601{
602 return ARRAY_SIZE(atmel_functions);
603}
604
605static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
606 unsigned selector)
607{
608 return atmel_functions[selector];
609}
610
611static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
612 unsigned selector,
613 const char * const **groups,
614 unsigned * const num_groups)
615{
616 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
617
618 *groups = atmel_pioctrl->group_names;
619 *num_groups = atmel_pioctrl->npins;
620
621 return 0;
622}
623
624static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
625 unsigned function,
626 unsigned group)
627{
628 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
629 unsigned pin;
630 u32 conf;
631
632 dev_dbg(pctldev->dev, "enable function %s group %s\n",
633 atmel_functions[function], atmel_pioctrl->groups[group].name);
634
635 pin = atmel_pioctrl->groups[group].pin;
636 conf = atmel_pin_config_read(pctldev, pin);
637 conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
638 conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
639 dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
640 atmel_pin_config_write(pctldev, pin, conf);
641
642 return 0;
643}
644
645static const struct pinmux_ops atmel_pmxops = {
646 .get_functions_count = atmel_pmx_get_functions_count,
647 .get_function_name = atmel_pmx_get_function_name,
648 .get_function_groups = atmel_pmx_get_function_groups,
649 .set_mux = atmel_pmx_set_mux,
650};
651
652static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
653 unsigned group,
654 unsigned long *config)
655{
656 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
657 unsigned param = pinconf_to_config_param(*config), arg = 0;
658 struct atmel_group *grp = atmel_pioctrl->groups + group;
659 unsigned pin_id = grp->pin;
660 u32 res;
661
662 res = atmel_pin_config_read(pctldev, pin_id);
663
664 switch (param) {
665 case PIN_CONFIG_BIAS_PULL_UP:
666 if (!(res & ATMEL_PIO_PUEN_MASK))
667 return -EINVAL;
668 arg = 1;
669 break;
670 case PIN_CONFIG_BIAS_PULL_DOWN:
671 if ((res & ATMEL_PIO_PUEN_MASK) ||
672 (!(res & ATMEL_PIO_PDEN_MASK)))
673 return -EINVAL;
674 arg = 1;
675 break;
676 case PIN_CONFIG_BIAS_DISABLE:
677 if ((res & ATMEL_PIO_PUEN_MASK) ||
678 ((res & ATMEL_PIO_PDEN_MASK)))
679 return -EINVAL;
680 arg = 1;
681 break;
682 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
683 if (!(res & ATMEL_PIO_OPD_MASK))
684 return -EINVAL;
685 arg = 1;
686 break;
687 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
688 if (!(res & ATMEL_PIO_SCHMITT_MASK))
689 return -EINVAL;
690 arg = 1;
691 break;
692 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
693 if (!(res & ATMEL_PIO_DRVSTR_MASK))
694 return -EINVAL;
695 arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET;
696 break;
697 default:
698 return -ENOTSUPP;
699 }
700
701 *config = pinconf_to_config_packed(param, arg);
702 return 0;
703}
704
705static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
706 unsigned group,
707 unsigned long *configs,
708 unsigned num_configs)
709{
710 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
711 struct atmel_group *grp = atmel_pioctrl->groups + group;
712 unsigned bank, pin, pin_id = grp->pin;
713 u32 mask, conf = 0;
714 int i;
715
716 conf = atmel_pin_config_read(pctldev, pin_id);
717
718 for (i = 0; i < num_configs; i++) {
719 unsigned param = pinconf_to_config_param(configs[i]);
720 unsigned arg = pinconf_to_config_argument(configs[i]);
721
722 dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
723 __func__, pin_id, configs[i]);
724
725 switch (param) {
726 case PIN_CONFIG_BIAS_DISABLE:
727 conf &= (~ATMEL_PIO_PUEN_MASK);
728 conf &= (~ATMEL_PIO_PDEN_MASK);
729 break;
730 case PIN_CONFIG_BIAS_PULL_UP:
731 conf |= ATMEL_PIO_PUEN_MASK;
732 conf &= (~ATMEL_PIO_PDEN_MASK);
733 break;
734 case PIN_CONFIG_BIAS_PULL_DOWN:
735 conf |= ATMEL_PIO_PDEN_MASK;
736 conf &= (~ATMEL_PIO_PUEN_MASK);
737 break;
738 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
739 if (arg == 0)
740 conf &= (~ATMEL_PIO_OPD_MASK);
741 else
742 conf |= ATMEL_PIO_OPD_MASK;
743 break;
744 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
745 if (arg == 0)
746 conf |= ATMEL_PIO_SCHMITT_MASK;
747 else
748 conf &= (~ATMEL_PIO_SCHMITT_MASK);
749 break;
750 case PIN_CONFIG_INPUT_DEBOUNCE:
751 if (arg == 0) {
752 conf &= (~ATMEL_PIO_IFEN_MASK);
753 conf &= (~ATMEL_PIO_IFSCEN_MASK);
754 } else {
755
756
757
758
759
760
761
762 conf |= ATMEL_PIO_IFEN_MASK;
763 conf |= ATMEL_PIO_IFSCEN_MASK;
764 }
765 break;
766 case PIN_CONFIG_OUTPUT:
767 conf |= ATMEL_PIO_DIR_MASK;
768 bank = ATMEL_PIO_BANK(pin_id);
769 pin = ATMEL_PIO_LINE(pin_id);
770 mask = 1 << pin;
771
772 if (arg == 0) {
773 writel_relaxed(mask, atmel_pioctrl->reg_base +
774 bank * ATMEL_PIO_BANK_OFFSET +
775 ATMEL_PIO_CODR);
776 } else {
777 writel_relaxed(mask, atmel_pioctrl->reg_base +
778 bank * ATMEL_PIO_BANK_OFFSET +
779 ATMEL_PIO_SODR);
780 }
781 break;
782 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
783 switch (arg) {
784 case ATMEL_PIO_DRVSTR_LO:
785 case ATMEL_PIO_DRVSTR_ME:
786 case ATMEL_PIO_DRVSTR_HI:
787 conf &= (~ATMEL_PIO_DRVSTR_MASK);
788 conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
789 break;
790 default:
791 dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
792 }
793 break;
794 default:
795 dev_warn(pctldev->dev,
796 "unsupported configuration parameter: %u\n",
797 param);
798 continue;
799 }
800 }
801
802 dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
803 atmel_pin_config_write(pctldev, pin_id, conf);
804
805 return 0;
806}
807
808static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
809 struct seq_file *s, unsigned pin_id)
810{
811 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
812 u32 conf;
813
814 if (!atmel_pioctrl->pins[pin_id]->device)
815 return;
816
817 if (atmel_pioctrl->pins[pin_id])
818 seq_printf(s, " (%s, ioset %u) ",
819 atmel_pioctrl->pins[pin_id]->device,
820 atmel_pioctrl->pins[pin_id]->ioset);
821
822 conf = atmel_pin_config_read(pctldev, pin_id);
823 if (conf & ATMEL_PIO_PUEN_MASK)
824 seq_printf(s, "%s ", "pull-up");
825 if (conf & ATMEL_PIO_PDEN_MASK)
826 seq_printf(s, "%s ", "pull-down");
827 if (conf & ATMEL_PIO_IFEN_MASK)
828 seq_printf(s, "%s ", "debounce");
829 if (conf & ATMEL_PIO_OPD_MASK)
830 seq_printf(s, "%s ", "open-drain");
831 if (conf & ATMEL_PIO_SCHMITT_MASK)
832 seq_printf(s, "%s ", "schmitt");
833 if (conf & ATMEL_PIO_DRVSTR_MASK) {
834 switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
835 case ATMEL_PIO_DRVSTR_ME:
836 seq_printf(s, "%s ", "medium-drive");
837 break;
838 case ATMEL_PIO_DRVSTR_HI:
839 seq_printf(s, "%s ", "high-drive");
840 break;
841
842 default:
843 seq_printf(s, "%s ", "low-drive");
844 }
845 }
846}
847
848static const struct pinconf_ops atmel_confops = {
849 .pin_config_group_get = atmel_conf_pin_config_group_get,
850 .pin_config_group_set = atmel_conf_pin_config_group_set,
851 .pin_config_dbg_show = atmel_conf_pin_config_dbg_show,
852};
853
854static struct pinctrl_desc atmel_pinctrl_desc = {
855 .name = "atmel_pinctrl",
856 .confops = &atmel_confops,
857 .pctlops = &atmel_pctlops,
858 .pmxops = &atmel_pmxops,
859};
860
861static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
862{
863 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
864 int i, j;
865
866
867
868
869
870 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
871 atmel_pioctrl->pm_suspend_backup[i].imr =
872 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
873 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
874 ~atmel_pioctrl->pm_wakeup_sources[i]);
875 atmel_pioctrl->pm_suspend_backup[i].odsr =
876 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
877 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
878 atmel_gpio_write(atmel_pioctrl, i,
879 ATMEL_PIO_MSKR, BIT(j));
880 atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
881 atmel_gpio_read(atmel_pioctrl, i,
882 ATMEL_PIO_CFGR);
883 }
884 }
885
886 return 0;
887}
888
889static int __maybe_unused atmel_pctrl_resume(struct device *dev)
890{
891 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
892 int i, j;
893
894 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
895 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
896 atmel_pioctrl->pm_suspend_backup[i].imr);
897 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
898 atmel_pioctrl->pm_suspend_backup[i].odsr);
899 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
900 atmel_gpio_write(atmel_pioctrl, i,
901 ATMEL_PIO_MSKR, BIT(j));
902 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
903 atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
904 }
905 }
906
907 return 0;
908}
909
910static const struct dev_pm_ops atmel_pctrl_pm_ops = {
911 SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
912};
913
914
915
916
917
918static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
919 .nbanks = 4,
920};
921
922static const struct of_device_id atmel_pctrl_of_match[] = {
923 {
924 .compatible = "atmel,sama5d2-pinctrl",
925 .data = &atmel_sama5d2_pioctrl_data,
926 }, {
927
928 }
929};
930
931static int atmel_pinctrl_probe(struct platform_device *pdev)
932{
933 struct device *dev = &pdev->dev;
934 struct pinctrl_pin_desc *pin_desc;
935 const char **group_names;
936 const struct of_device_id *match;
937 int i, ret;
938 struct resource *res;
939 struct atmel_pioctrl *atmel_pioctrl;
940 const struct atmel_pioctrl_data *atmel_pioctrl_data;
941
942 atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
943 if (!atmel_pioctrl)
944 return -ENOMEM;
945 atmel_pioctrl->dev = dev;
946 atmel_pioctrl->node = dev->of_node;
947 platform_set_drvdata(pdev, atmel_pioctrl);
948
949 match = of_match_node(atmel_pctrl_of_match, dev->of_node);
950 if (!match) {
951 dev_err(dev, "unknown compatible string\n");
952 return -ENODEV;
953 }
954 atmel_pioctrl_data = match->data;
955 atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
956 atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
957
958 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
959 atmel_pioctrl->reg_base = devm_ioremap_resource(dev, res);
960 if (IS_ERR(atmel_pioctrl->reg_base))
961 return -EINVAL;
962
963 atmel_pioctrl->clk = devm_clk_get(dev, NULL);
964 if (IS_ERR(atmel_pioctrl->clk)) {
965 dev_err(dev, "failed to get clock\n");
966 return PTR_ERR(atmel_pioctrl->clk);
967 }
968
969 atmel_pioctrl->pins = devm_kcalloc(dev,
970 atmel_pioctrl->npins,
971 sizeof(*atmel_pioctrl->pins),
972 GFP_KERNEL);
973 if (!atmel_pioctrl->pins)
974 return -ENOMEM;
975
976 pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc),
977 GFP_KERNEL);
978 if (!pin_desc)
979 return -ENOMEM;
980 atmel_pinctrl_desc.pins = pin_desc;
981 atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
982 atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings);
983 atmel_pinctrl_desc.custom_params = atmel_custom_bindings;
984
985
986 group_names = devm_kcalloc(dev,
987 atmel_pioctrl->npins, sizeof(*group_names),
988 GFP_KERNEL);
989 if (!group_names)
990 return -ENOMEM;
991 atmel_pioctrl->group_names = group_names;
992
993 atmel_pioctrl->groups = devm_kcalloc(&pdev->dev,
994 atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups),
995 GFP_KERNEL);
996 if (!atmel_pioctrl->groups)
997 return -ENOMEM;
998 for (i = 0 ; i < atmel_pioctrl->npins; i++) {
999 struct atmel_group *group = atmel_pioctrl->groups + i;
1000 unsigned bank = ATMEL_PIO_BANK(i);
1001 unsigned line = ATMEL_PIO_LINE(i);
1002
1003 atmel_pioctrl->pins[i] = devm_kzalloc(dev,
1004 sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
1005 if (!atmel_pioctrl->pins[i])
1006 return -ENOMEM;
1007
1008 atmel_pioctrl->pins[i]->pin_id = i;
1009 atmel_pioctrl->pins[i]->bank = bank;
1010 atmel_pioctrl->pins[i]->line = line;
1011
1012 pin_desc[i].number = i;
1013
1014 pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
1015 bank + 'A', line);
1016
1017 group->name = group_names[i] = pin_desc[i].name;
1018 group->pin = pin_desc[i].number;
1019
1020 dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
1021 }
1022
1023 atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
1024 atmel_pioctrl->gpio_chip->of_node = dev->of_node;
1025 atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
1026 atmel_pioctrl->gpio_chip->label = dev_name(dev);
1027 atmel_pioctrl->gpio_chip->parent = dev;
1028 atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
1029
1030 atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev,
1031 atmel_pioctrl->nbanks,
1032 sizeof(*atmel_pioctrl->pm_wakeup_sources),
1033 GFP_KERNEL);
1034 if (!atmel_pioctrl->pm_wakeup_sources)
1035 return -ENOMEM;
1036
1037 atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev,
1038 atmel_pioctrl->nbanks,
1039 sizeof(*atmel_pioctrl->pm_suspend_backup),
1040 GFP_KERNEL);
1041 if (!atmel_pioctrl->pm_suspend_backup)
1042 return -ENOMEM;
1043
1044 atmel_pioctrl->irqs = devm_kcalloc(dev,
1045 atmel_pioctrl->nbanks,
1046 sizeof(*atmel_pioctrl->irqs),
1047 GFP_KERNEL);
1048 if (!atmel_pioctrl->irqs)
1049 return -ENOMEM;
1050
1051
1052 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
1053 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
1054 if (!res) {
1055 dev_err(dev, "missing irq resource for group %c\n",
1056 'A' + i);
1057 return -EINVAL;
1058 }
1059 atmel_pioctrl->irqs[i] = res->start;
1060 irq_set_chained_handler(res->start, atmel_gpio_irq_handler);
1061 irq_set_handler_data(res->start, atmel_pioctrl);
1062 dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
1063 }
1064
1065 atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
1066 atmel_pioctrl->gpio_chip->ngpio,
1067 &irq_domain_simple_ops, NULL);
1068 if (!atmel_pioctrl->irq_domain) {
1069 dev_err(dev, "can't add the irq domain\n");
1070 return -ENODEV;
1071 }
1072 atmel_pioctrl->irq_domain->name = "atmel gpio";
1073
1074 for (i = 0; i < atmel_pioctrl->npins; i++) {
1075 int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
1076
1077 irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
1078 handle_simple_irq);
1079 irq_set_chip_data(irq, atmel_pioctrl);
1080 dev_dbg(dev,
1081 "atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
1082 i, irq);
1083 }
1084
1085 ret = clk_prepare_enable(atmel_pioctrl->clk);
1086 if (ret) {
1087 dev_err(dev, "failed to prepare and enable clock\n");
1088 goto clk_prepare_enable_error;
1089 }
1090
1091 atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
1092 &atmel_pinctrl_desc,
1093 atmel_pioctrl);
1094 if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
1095 ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
1096 dev_err(dev, "pinctrl registration failed\n");
1097 goto clk_unprep;
1098 }
1099
1100 ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
1101 if (ret) {
1102 dev_err(dev, "failed to add gpiochip\n");
1103 goto clk_unprep;
1104 }
1105
1106 ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
1107 0, 0, atmel_pioctrl->gpio_chip->ngpio);
1108 if (ret) {
1109 dev_err(dev, "failed to add gpio pin range\n");
1110 goto gpiochip_add_pin_range_error;
1111 }
1112
1113 dev_info(&pdev->dev, "atmel pinctrl initialized\n");
1114
1115 return 0;
1116
1117gpiochip_add_pin_range_error:
1118 gpiochip_remove(atmel_pioctrl->gpio_chip);
1119
1120clk_unprep:
1121 clk_disable_unprepare(atmel_pioctrl->clk);
1122
1123clk_prepare_enable_error:
1124 irq_domain_remove(atmel_pioctrl->irq_domain);
1125
1126 return ret;
1127}
1128
1129static struct platform_driver atmel_pinctrl_driver = {
1130 .driver = {
1131 .name = "pinctrl-at91-pio4",
1132 .of_match_table = atmel_pctrl_of_match,
1133 .pm = &atmel_pctrl_pm_ops,
1134 .suppress_bind_attrs = true,
1135 },
1136 .probe = atmel_pinctrl_probe,
1137};
1138builtin_platform_driver(atmel_pinctrl_driver);
1139
