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_SR_MASK BIT(11)
40#define ATMEL_PIO_IFEN_MASK BIT(12)
41#define ATMEL_PIO_IFSCEN_MASK BIT(13)
42#define ATMEL_PIO_OPD_MASK BIT(14)
43#define ATMEL_PIO_SCHMITT_MASK BIT(15)
44#define ATMEL_PIO_DRVSTR_MASK GENMASK(17, 16)
45#define ATMEL_PIO_DRVSTR_OFFSET 16
46#define ATMEL_PIO_CFGR_EVTSEL_MASK GENMASK(26, 24)
47#define ATMEL_PIO_CFGR_EVTSEL_FALLING (0 << 24)
48#define ATMEL_PIO_CFGR_EVTSEL_RISING (1 << 24)
49#define ATMEL_PIO_CFGR_EVTSEL_BOTH (2 << 24)
50#define ATMEL_PIO_CFGR_EVTSEL_LOW (3 << 24)
51#define ATMEL_PIO_CFGR_EVTSEL_HIGH (4 << 24)
52#define ATMEL_PIO_PDSR 0x0008
53#define ATMEL_PIO_LOCKSR 0x000C
54#define ATMEL_PIO_SODR 0x0010
55#define ATMEL_PIO_CODR 0x0014
56#define ATMEL_PIO_ODSR 0x0018
57#define ATMEL_PIO_IER 0x0020
58#define ATMEL_PIO_IDR 0x0024
59#define ATMEL_PIO_IMR 0x0028
60#define ATMEL_PIO_ISR 0x002C
61#define ATMEL_PIO_IOFR 0x003C
62
63#define ATMEL_PIO_NPINS_PER_BANK 32
64#define ATMEL_PIO_BANK(pin_id) (pin_id / ATMEL_PIO_NPINS_PER_BANK)
65#define ATMEL_PIO_LINE(pin_id) (pin_id % ATMEL_PIO_NPINS_PER_BANK)
66#define ATMEL_PIO_BANK_OFFSET 0x40
67
68#define ATMEL_GET_PIN_NO(pinfunc) ((pinfunc) & 0xff)
69#define ATMEL_GET_PIN_FUNC(pinfunc) ((pinfunc >> 16) & 0xf)
70#define ATMEL_GET_PIN_IOSET(pinfunc) ((pinfunc >> 20) & 0xf)
71
72
73#define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1)
74
75
76
77
78
79
80
81
82struct atmel_pioctrl_data {
83 unsigned int nbanks;
84 unsigned int last_bank_count;
85 unsigned int slew_rate_support;
86};
87
88struct atmel_group {
89 const char *name;
90 u32 pin;
91};
92
93struct atmel_pin {
94 unsigned int pin_id;
95 unsigned int mux;
96 unsigned int ioset;
97 unsigned int bank;
98 unsigned int line;
99 const char *device;
100};
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125struct atmel_pioctrl {
126 void __iomem *reg_base;
127 struct clk *clk;
128 unsigned int nbanks;
129 struct pinctrl_dev *pinctrl_dev;
130 struct atmel_group *groups;
131 const char * const *group_names;
132 struct atmel_pin **pins;
133 unsigned int npins;
134 struct gpio_chip *gpio_chip;
135 struct irq_domain *irq_domain;
136 int *irqs;
137 unsigned int *pm_wakeup_sources;
138 struct {
139 u32 imr;
140 u32 odsr;
141 u32 cfgr[ATMEL_PIO_NPINS_PER_BANK];
142 } *pm_suspend_backup;
143 struct device *dev;
144 struct device_node *node;
145 unsigned int slew_rate_support;
146};
147
148static const char * const atmel_functions[] = {
149 "GPIO", "A", "B", "C", "D", "E", "F", "G"
150};
151
152static const struct pinconf_generic_params atmel_custom_bindings[] = {
153 {"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0},
154};
155
156
157static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
158 unsigned int bank, unsigned int reg)
159{
160 return readl_relaxed(atmel_pioctrl->reg_base
161 + ATMEL_PIO_BANK_OFFSET * bank + reg);
162}
163
164static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
165 unsigned int bank, unsigned int reg,
166 unsigned int val)
167{
168 writel_relaxed(val, atmel_pioctrl->reg_base
169 + ATMEL_PIO_BANK_OFFSET * bank + reg);
170}
171
172static void atmel_gpio_irq_ack(struct irq_data *d)
173{
174
175
176
177
178}
179
180static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned int type)
181{
182 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
183 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
184 unsigned int reg;
185
186 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
187 BIT(pin->line));
188 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
189 reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
190
191 switch (type) {
192 case IRQ_TYPE_EDGE_RISING:
193 irq_set_handler_locked(d, handle_edge_irq);
194 reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
195 break;
196 case IRQ_TYPE_EDGE_FALLING:
197 irq_set_handler_locked(d, handle_edge_irq);
198 reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
199 break;
200 case IRQ_TYPE_EDGE_BOTH:
201 irq_set_handler_locked(d, handle_edge_irq);
202 reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
203 break;
204 case IRQ_TYPE_LEVEL_LOW:
205 irq_set_handler_locked(d, handle_level_irq);
206 reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
207 break;
208 case IRQ_TYPE_LEVEL_HIGH:
209 irq_set_handler_locked(d, handle_level_irq);
210 reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
211 break;
212 case IRQ_TYPE_NONE:
213 default:
214 return -EINVAL;
215 }
216
217 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
218
219 return 0;
220}
221
222static void atmel_gpio_irq_mask(struct irq_data *d)
223{
224 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
225 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
226
227 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
228 BIT(pin->line));
229}
230
231static void atmel_gpio_irq_unmask(struct irq_data *d)
232{
233 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
234 struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
235
236 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
237 BIT(pin->line));
238}
239
240#ifdef CONFIG_PM_SLEEP
241
242static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
243{
244 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
245 int bank = ATMEL_PIO_BANK(d->hwirq);
246 int line = ATMEL_PIO_LINE(d->hwirq);
247
248
249 irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
250
251 if (on)
252 atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
253 else
254 atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
255
256 return 0;
257}
258#else
259#define atmel_gpio_irq_set_wake NULL
260#endif
261
262static struct irq_chip atmel_gpio_irq_chip = {
263 .name = "GPIO",
264 .irq_ack = atmel_gpio_irq_ack,
265 .irq_mask = atmel_gpio_irq_mask,
266 .irq_unmask = atmel_gpio_irq_unmask,
267 .irq_set_type = atmel_gpio_irq_set_type,
268 .irq_set_wake = atmel_gpio_irq_set_wake,
269};
270
271static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
272{
273 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
274
275 return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
276}
277
278static void atmel_gpio_irq_handler(struct irq_desc *desc)
279{
280 unsigned int irq = irq_desc_get_irq(desc);
281 struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
282 struct irq_chip *chip = irq_desc_get_chip(desc);
283 unsigned long isr;
284 int n, bank = -1;
285
286
287 for (n = 0; n < atmel_pioctrl->nbanks; n++) {
288 if (atmel_pioctrl->irqs[n] == irq) {
289 bank = n;
290 break;
291 }
292 }
293
294 if (bank < 0) {
295 dev_err(atmel_pioctrl->dev,
296 "no bank associated to irq %u\n", irq);
297 return;
298 }
299
300 chained_irq_enter(chip, desc);
301
302 for (;;) {
303 isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
304 ATMEL_PIO_ISR);
305 isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
306 ATMEL_PIO_IMR);
307 if (!isr)
308 break;
309
310 for_each_set_bit(n, &isr, BITS_PER_LONG)
311 generic_handle_irq(atmel_gpio_to_irq(
312 atmel_pioctrl->gpio_chip,
313 bank * ATMEL_PIO_NPINS_PER_BANK + n));
314 }
315
316 chained_irq_exit(chip, desc);
317}
318
319static int atmel_gpio_direction_input(struct gpio_chip *chip,
320 unsigned int offset)
321{
322 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
323 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
324 unsigned int reg;
325
326 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
327 BIT(pin->line));
328 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
329 reg &= ~ATMEL_PIO_DIR_MASK;
330 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
331
332 return 0;
333}
334
335static int atmel_gpio_get(struct gpio_chip *chip, unsigned int offset)
336{
337 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
338 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
339 unsigned int reg;
340
341 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
342
343 return !!(reg & BIT(pin->line));
344}
345
346static int atmel_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
347 unsigned long *bits)
348{
349 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
350 unsigned int bank;
351
352 bitmap_zero(bits, atmel_pioctrl->npins);
353
354 for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
355 unsigned int word = bank;
356 unsigned int offset = 0;
357 unsigned int reg;
358
359#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
360 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
361 offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG;
362#endif
363 if (!mask[word])
364 continue;
365
366 reg = atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_PDSR);
367 bits[word] |= mask[word] & (reg << offset);
368 }
369
370 return 0;
371}
372
373static int atmel_gpio_direction_output(struct gpio_chip *chip,
374 unsigned int offset,
375 int value)
376{
377 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
378 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
379 unsigned int reg;
380
381 atmel_gpio_write(atmel_pioctrl, pin->bank,
382 value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
383 BIT(pin->line));
384
385 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
386 BIT(pin->line));
387 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
388 reg |= ATMEL_PIO_DIR_MASK;
389 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
390
391 return 0;
392}
393
394static void atmel_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
395{
396 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
397 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
398
399 atmel_gpio_write(atmel_pioctrl, pin->bank,
400 val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
401 BIT(pin->line));
402}
403
404static void atmel_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
405 unsigned long *bits)
406{
407 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
408 unsigned int bank;
409
410 for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
411 unsigned int bitmask;
412 unsigned int word = bank;
413
414
415
416
417
418#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
419 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
420#endif
421 if (!mask[word])
422 continue;
423
424 bitmask = mask[word] & bits[word];
425 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_SODR, bitmask);
426
427 bitmask = mask[word] & ~bits[word];
428 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_CODR, bitmask);
429
430#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
431 mask[word] >>= ATMEL_PIO_NPINS_PER_BANK;
432 bits[word] >>= ATMEL_PIO_NPINS_PER_BANK;
433#endif
434 }
435}
436
437static struct gpio_chip atmel_gpio_chip = {
438 .direction_input = atmel_gpio_direction_input,
439 .get = atmel_gpio_get,
440 .get_multiple = atmel_gpio_get_multiple,
441 .direction_output = atmel_gpio_direction_output,
442 .set = atmel_gpio_set,
443 .set_multiple = atmel_gpio_set_multiple,
444 .to_irq = atmel_gpio_to_irq,
445 .base = 0,
446};
447
448
449static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
450 unsigned int pin_id)
451{
452 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
453 unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
454 unsigned int line = atmel_pioctrl->pins[pin_id]->line;
455 void __iomem *addr = atmel_pioctrl->reg_base
456 + bank * ATMEL_PIO_BANK_OFFSET;
457
458 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
459
460 wmb();
461
462 return readl_relaxed(addr + ATMEL_PIO_CFGR);
463}
464
465static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
466 unsigned int pin_id, u32 conf)
467{
468 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
469 unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
470 unsigned int line = atmel_pioctrl->pins[pin_id]->line;
471 void __iomem *addr = atmel_pioctrl->reg_base
472 + bank * ATMEL_PIO_BANK_OFFSET;
473
474 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
475
476 wmb();
477 writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
478}
479
480static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
481{
482 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
483
484 return atmel_pioctrl->npins;
485}
486
487static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
488 unsigned int selector)
489{
490 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
491
492 return atmel_pioctrl->groups[selector].name;
493}
494
495static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
496 unsigned int selector,
497 const unsigned int **pins,
498 unsigned int *num_pins)
499{
500 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
501
502 *pins = (unsigned int *)&atmel_pioctrl->groups[selector].pin;
503 *num_pins = 1;
504
505 return 0;
506}
507
508static struct atmel_group *
509atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned int pin)
510{
511 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
512 int i;
513
514 for (i = 0; i < atmel_pioctrl->npins; i++) {
515 struct atmel_group *grp = atmel_pioctrl->groups + i;
516
517 if (grp->pin == pin)
518 return grp;
519 }
520
521 return NULL;
522}
523
524static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
525 struct device_node *np,
526 u32 pinfunc, const char **grp_name,
527 const char **func_name)
528{
529 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
530 unsigned int pin_id, func_id;
531 struct atmel_group *grp;
532
533 pin_id = ATMEL_GET_PIN_NO(pinfunc);
534 func_id = ATMEL_GET_PIN_FUNC(pinfunc);
535
536 if (func_id >= ARRAY_SIZE(atmel_functions))
537 return -EINVAL;
538
539 *func_name = atmel_functions[func_id];
540
541 grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
542 if (!grp)
543 return -EINVAL;
544 *grp_name = grp->name;
545
546 atmel_pioctrl->pins[pin_id]->mux = func_id;
547 atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
548
549 if (np->parent == atmel_pioctrl->node)
550 atmel_pioctrl->pins[pin_id]->device = np->name;
551 else
552 atmel_pioctrl->pins[pin_id]->device = np->parent->name;
553
554 return 0;
555}
556
557static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
558 struct device_node *np,
559 struct pinctrl_map **map,
560 unsigned int *reserved_maps,
561 unsigned int *num_maps)
562{
563 unsigned int num_pins, num_configs, reserve;
564 unsigned long *configs;
565 struct property *pins;
566 u32 pinfunc;
567 int ret, i;
568
569 pins = of_find_property(np, "pinmux", NULL);
570 if (!pins)
571 return -EINVAL;
572
573 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
574 &num_configs);
575 if (ret < 0) {
576 dev_err(pctldev->dev, "%pOF: could not parse node property\n",
577 np);
578 return ret;
579 }
580
581 num_pins = pins->length / sizeof(u32);
582 if (!num_pins) {
583 dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
584 ret = -EINVAL;
585 goto exit;
586 }
587
588
589
590
591
592 reserve = 1;
593 if (num_configs)
594 reserve++;
595 reserve *= num_pins;
596 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
597 reserve);
598 if (ret < 0)
599 goto exit;
600
601 for (i = 0; i < num_pins; i++) {
602 const char *group, *func;
603
604 ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
605 if (ret)
606 goto exit;
607
608 ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
609 &func);
610 if (ret)
611 goto exit;
612
613 pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
614 group, func);
615
616 if (num_configs) {
617 ret = pinctrl_utils_add_map_configs(pctldev, map,
618 reserved_maps, num_maps, group,
619 configs, num_configs,
620 PIN_MAP_TYPE_CONFIGS_GROUP);
621 if (ret < 0)
622 goto exit;
623 }
624 }
625
626exit:
627 kfree(configs);
628 return ret;
629}
630
631static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
632 struct device_node *np_config,
633 struct pinctrl_map **map,
634 unsigned int *num_maps)
635{
636 struct device_node *np;
637 unsigned int reserved_maps;
638 int ret;
639
640 *map = NULL;
641 *num_maps = 0;
642 reserved_maps = 0;
643
644
645
646
647
648
649 ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
650 &reserved_maps, num_maps);
651 if (ret) {
652 for_each_child_of_node(np_config, np) {
653 ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
654 &reserved_maps, num_maps);
655 if (ret < 0) {
656 of_node_put(np);
657 break;
658 }
659 }
660 }
661
662 if (ret < 0) {
663 pinctrl_utils_free_map(pctldev, *map, *num_maps);
664 dev_err(pctldev->dev, "can't create maps for node %pOF\n",
665 np_config);
666 }
667
668 return ret;
669}
670
671static const struct pinctrl_ops atmel_pctlops = {
672 .get_groups_count = atmel_pctl_get_groups_count,
673 .get_group_name = atmel_pctl_get_group_name,
674 .get_group_pins = atmel_pctl_get_group_pins,
675 .dt_node_to_map = atmel_pctl_dt_node_to_map,
676 .dt_free_map = pinctrl_utils_free_map,
677};
678
679static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
680{
681 return ARRAY_SIZE(atmel_functions);
682}
683
684static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
685 unsigned int selector)
686{
687 return atmel_functions[selector];
688}
689
690static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
691 unsigned int selector,
692 const char * const **groups,
693 unsigned * const num_groups)
694{
695 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
696
697 *groups = atmel_pioctrl->group_names;
698 *num_groups = atmel_pioctrl->npins;
699
700 return 0;
701}
702
703static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
704 unsigned int function,
705 unsigned int group)
706{
707 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
708 unsigned int pin;
709 u32 conf;
710
711 dev_dbg(pctldev->dev, "enable function %s group %s\n",
712 atmel_functions[function], atmel_pioctrl->groups[group].name);
713
714 pin = atmel_pioctrl->groups[group].pin;
715 conf = atmel_pin_config_read(pctldev, pin);
716 conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
717 conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
718 dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
719 atmel_pin_config_write(pctldev, pin, conf);
720
721 return 0;
722}
723
724static const struct pinmux_ops atmel_pmxops = {
725 .get_functions_count = atmel_pmx_get_functions_count,
726 .get_function_name = atmel_pmx_get_function_name,
727 .get_function_groups = atmel_pmx_get_function_groups,
728 .set_mux = atmel_pmx_set_mux,
729};
730
731static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
732 unsigned int group,
733 unsigned long *config)
734{
735 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
736 unsigned int param = pinconf_to_config_param(*config), arg = 0;
737 struct atmel_group *grp = atmel_pioctrl->groups + group;
738 unsigned int pin_id = grp->pin;
739 u32 res;
740
741 res = atmel_pin_config_read(pctldev, pin_id);
742
743 switch (param) {
744 case PIN_CONFIG_BIAS_PULL_UP:
745 if (!(res & ATMEL_PIO_PUEN_MASK))
746 return -EINVAL;
747 arg = 1;
748 break;
749 case PIN_CONFIG_BIAS_PULL_DOWN:
750 if ((res & ATMEL_PIO_PUEN_MASK) ||
751 (!(res & ATMEL_PIO_PDEN_MASK)))
752 return -EINVAL;
753 arg = 1;
754 break;
755 case PIN_CONFIG_BIAS_DISABLE:
756 if ((res & ATMEL_PIO_PUEN_MASK) ||
757 ((res & ATMEL_PIO_PDEN_MASK)))
758 return -EINVAL;
759 arg = 1;
760 break;
761 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
762 if (!(res & ATMEL_PIO_OPD_MASK))
763 return -EINVAL;
764 arg = 1;
765 break;
766 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
767 if (!(res & ATMEL_PIO_SCHMITT_MASK))
768 return -EINVAL;
769 arg = 1;
770 break;
771 case PIN_CONFIG_SLEW_RATE:
772 if (!atmel_pioctrl->slew_rate_support)
773 return -EOPNOTSUPP;
774 if (!(res & ATMEL_PIO_SR_MASK))
775 return -EINVAL;
776 arg = 1;
777 break;
778 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
779 if (!(res & ATMEL_PIO_DRVSTR_MASK))
780 return -EINVAL;
781 arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET;
782 break;
783 default:
784 return -ENOTSUPP;
785 }
786
787 *config = pinconf_to_config_packed(param, arg);
788 return 0;
789}
790
791static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
792 unsigned int group,
793 unsigned long *configs,
794 unsigned int num_configs)
795{
796 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
797 struct atmel_group *grp = atmel_pioctrl->groups + group;
798 unsigned int bank, pin, pin_id = grp->pin;
799 u32 mask, conf = 0;
800 int i;
801
802 conf = atmel_pin_config_read(pctldev, pin_id);
803
804
805 if (atmel_pioctrl->slew_rate_support)
806 conf |= ATMEL_PIO_SR_MASK;
807
808 for (i = 0; i < num_configs; i++) {
809 unsigned int param = pinconf_to_config_param(configs[i]);
810 unsigned int arg = pinconf_to_config_argument(configs[i]);
811
812 dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
813 __func__, pin_id, configs[i]);
814
815 switch (param) {
816 case PIN_CONFIG_BIAS_DISABLE:
817 conf &= (~ATMEL_PIO_PUEN_MASK);
818 conf &= (~ATMEL_PIO_PDEN_MASK);
819 break;
820 case PIN_CONFIG_BIAS_PULL_UP:
821 conf |= ATMEL_PIO_PUEN_MASK;
822 conf &= (~ATMEL_PIO_PDEN_MASK);
823 break;
824 case PIN_CONFIG_BIAS_PULL_DOWN:
825 conf |= ATMEL_PIO_PDEN_MASK;
826 conf &= (~ATMEL_PIO_PUEN_MASK);
827 break;
828 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
829 if (arg == 0)
830 conf &= (~ATMEL_PIO_OPD_MASK);
831 else
832 conf |= ATMEL_PIO_OPD_MASK;
833 break;
834 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
835 if (arg == 0)
836 conf |= ATMEL_PIO_SCHMITT_MASK;
837 else
838 conf &= (~ATMEL_PIO_SCHMITT_MASK);
839 break;
840 case PIN_CONFIG_INPUT_DEBOUNCE:
841 if (arg == 0) {
842 conf &= (~ATMEL_PIO_IFEN_MASK);
843 conf &= (~ATMEL_PIO_IFSCEN_MASK);
844 } else {
845
846
847
848
849
850
851
852 conf |= ATMEL_PIO_IFEN_MASK;
853 conf |= ATMEL_PIO_IFSCEN_MASK;
854 }
855 break;
856 case PIN_CONFIG_OUTPUT:
857 conf |= ATMEL_PIO_DIR_MASK;
858 bank = ATMEL_PIO_BANK(pin_id);
859 pin = ATMEL_PIO_LINE(pin_id);
860 mask = 1 << pin;
861
862 if (arg == 0) {
863 writel_relaxed(mask, atmel_pioctrl->reg_base +
864 bank * ATMEL_PIO_BANK_OFFSET +
865 ATMEL_PIO_CODR);
866 } else {
867 writel_relaxed(mask, atmel_pioctrl->reg_base +
868 bank * ATMEL_PIO_BANK_OFFSET +
869 ATMEL_PIO_SODR);
870 }
871 break;
872 case PIN_CONFIG_SLEW_RATE:
873 if (!atmel_pioctrl->slew_rate_support)
874 break;
875
876 if (arg == 0)
877 conf &= ~ATMEL_PIO_SR_MASK;
878 break;
879 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
880 switch (arg) {
881 case ATMEL_PIO_DRVSTR_LO:
882 case ATMEL_PIO_DRVSTR_ME:
883 case ATMEL_PIO_DRVSTR_HI:
884 conf &= (~ATMEL_PIO_DRVSTR_MASK);
885 conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
886 break;
887 default:
888 dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
889 }
890 break;
891 default:
892 dev_warn(pctldev->dev,
893 "unsupported configuration parameter: %u\n",
894 param);
895 continue;
896 }
897 }
898
899 dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
900 atmel_pin_config_write(pctldev, pin_id, conf);
901
902 return 0;
903}
904
905static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
906 struct seq_file *s,
907 unsigned int pin_id)
908{
909 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
910 u32 conf;
911
912 if (!atmel_pioctrl->pins[pin_id]->device)
913 return;
914
915 if (atmel_pioctrl->pins[pin_id])
916 seq_printf(s, " (%s, ioset %u) ",
917 atmel_pioctrl->pins[pin_id]->device,
918 atmel_pioctrl->pins[pin_id]->ioset);
919
920 conf = atmel_pin_config_read(pctldev, pin_id);
921 if (conf & ATMEL_PIO_PUEN_MASK)
922 seq_printf(s, "%s ", "pull-up");
923 if (conf & ATMEL_PIO_PDEN_MASK)
924 seq_printf(s, "%s ", "pull-down");
925 if (conf & ATMEL_PIO_IFEN_MASK)
926 seq_printf(s, "%s ", "debounce");
927 if (conf & ATMEL_PIO_OPD_MASK)
928 seq_printf(s, "%s ", "open-drain");
929 if (conf & ATMEL_PIO_SCHMITT_MASK)
930 seq_printf(s, "%s ", "schmitt");
931 if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
932 seq_printf(s, "%s ", "slew-rate");
933 if (conf & ATMEL_PIO_DRVSTR_MASK) {
934 switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
935 case ATMEL_PIO_DRVSTR_ME:
936 seq_printf(s, "%s ", "medium-drive");
937 break;
938 case ATMEL_PIO_DRVSTR_HI:
939 seq_printf(s, "%s ", "high-drive");
940 break;
941
942 default:
943 seq_printf(s, "%s ", "low-drive");
944 }
945 }
946}
947
948static const struct pinconf_ops atmel_confops = {
949 .pin_config_group_get = atmel_conf_pin_config_group_get,
950 .pin_config_group_set = atmel_conf_pin_config_group_set,
951 .pin_config_dbg_show = atmel_conf_pin_config_dbg_show,
952};
953
954static struct pinctrl_desc atmel_pinctrl_desc = {
955 .name = "atmel_pinctrl",
956 .confops = &atmel_confops,
957 .pctlops = &atmel_pctlops,
958 .pmxops = &atmel_pmxops,
959};
960
961static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
962{
963 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
964 int i, j;
965
966
967
968
969
970 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
971 atmel_pioctrl->pm_suspend_backup[i].imr =
972 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
973 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
974 ~atmel_pioctrl->pm_wakeup_sources[i]);
975 atmel_pioctrl->pm_suspend_backup[i].odsr =
976 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
977 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
978 atmel_gpio_write(atmel_pioctrl, i,
979 ATMEL_PIO_MSKR, BIT(j));
980 atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
981 atmel_gpio_read(atmel_pioctrl, i,
982 ATMEL_PIO_CFGR);
983 }
984 }
985
986 return 0;
987}
988
989static int __maybe_unused atmel_pctrl_resume(struct device *dev)
990{
991 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
992 int i, j;
993
994 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
995 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
996 atmel_pioctrl->pm_suspend_backup[i].imr);
997 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
998 atmel_pioctrl->pm_suspend_backup[i].odsr);
999 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
1000 atmel_gpio_write(atmel_pioctrl, i,
1001 ATMEL_PIO_MSKR, BIT(j));
1002 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
1003 atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
1004 }
1005 }
1006
1007 return 0;
1008}
1009
1010static const struct dev_pm_ops atmel_pctrl_pm_ops = {
1011 SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
1012};
1013
1014
1015
1016
1017
1018static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
1019 .nbanks = 4,
1020 .last_bank_count = ATMEL_PIO_NPINS_PER_BANK,
1021};
1022
1023static const struct atmel_pioctrl_data microchip_sama7g5_pioctrl_data = {
1024 .nbanks = 5,
1025 .last_bank_count = 8,
1026 .slew_rate_support = 1,
1027};
1028
1029static const struct of_device_id atmel_pctrl_of_match[] = {
1030 {
1031 .compatible = "atmel,sama5d2-pinctrl",
1032 .data = &atmel_sama5d2_pioctrl_data,
1033 }, {
1034 .compatible = "microchip,sama7g5-pinctrl",
1035 .data = µchip_sama7g5_pioctrl_data,
1036 }, {
1037
1038 }
1039};
1040
1041static int atmel_pinctrl_probe(struct platform_device *pdev)
1042{
1043 struct device *dev = &pdev->dev;
1044 struct pinctrl_pin_desc *pin_desc;
1045 const char **group_names;
1046 const struct of_device_id *match;
1047 int i, ret;
1048 struct resource *res;
1049 struct atmel_pioctrl *atmel_pioctrl;
1050 const struct atmel_pioctrl_data *atmel_pioctrl_data;
1051
1052 atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
1053 if (!atmel_pioctrl)
1054 return -ENOMEM;
1055 atmel_pioctrl->dev = dev;
1056 atmel_pioctrl->node = dev->of_node;
1057 platform_set_drvdata(pdev, atmel_pioctrl);
1058
1059 match = of_match_node(atmel_pctrl_of_match, dev->of_node);
1060 if (!match) {
1061 dev_err(dev, "unknown compatible string\n");
1062 return -ENODEV;
1063 }
1064 atmel_pioctrl_data = match->data;
1065 atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
1066 atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
1067
1068 if (atmel_pioctrl_data->last_bank_count != ATMEL_PIO_NPINS_PER_BANK) {
1069 atmel_pioctrl->npins -= ATMEL_PIO_NPINS_PER_BANK;
1070 atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
1071 }
1072 atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
1073
1074 atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
1075 if (IS_ERR(atmel_pioctrl->reg_base))
1076 return PTR_ERR(atmel_pioctrl->reg_base);
1077
1078 atmel_pioctrl->clk = devm_clk_get(dev, NULL);
1079 if (IS_ERR(atmel_pioctrl->clk)) {
1080 dev_err(dev, "failed to get clock\n");
1081 return PTR_ERR(atmel_pioctrl->clk);
1082 }
1083
1084 atmel_pioctrl->pins = devm_kcalloc(dev,
1085 atmel_pioctrl->npins,
1086 sizeof(*atmel_pioctrl->pins),
1087 GFP_KERNEL);
1088 if (!atmel_pioctrl->pins)
1089 return -ENOMEM;
1090
1091 pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc),
1092 GFP_KERNEL);
1093 if (!pin_desc)
1094 return -ENOMEM;
1095 atmel_pinctrl_desc.pins = pin_desc;
1096 atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
1097 atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings);
1098 atmel_pinctrl_desc.custom_params = atmel_custom_bindings;
1099
1100
1101 group_names = devm_kcalloc(dev,
1102 atmel_pioctrl->npins, sizeof(*group_names),
1103 GFP_KERNEL);
1104 if (!group_names)
1105 return -ENOMEM;
1106 atmel_pioctrl->group_names = group_names;
1107
1108 atmel_pioctrl->groups = devm_kcalloc(&pdev->dev,
1109 atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups),
1110 GFP_KERNEL);
1111 if (!atmel_pioctrl->groups)
1112 return -ENOMEM;
1113 for (i = 0 ; i < atmel_pioctrl->npins; i++) {
1114 struct atmel_group *group = atmel_pioctrl->groups + i;
1115 unsigned int bank = ATMEL_PIO_BANK(i);
1116 unsigned int line = ATMEL_PIO_LINE(i);
1117
1118 atmel_pioctrl->pins[i] = devm_kzalloc(dev,
1119 sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
1120 if (!atmel_pioctrl->pins[i])
1121 return -ENOMEM;
1122
1123 atmel_pioctrl->pins[i]->pin_id = i;
1124 atmel_pioctrl->pins[i]->bank = bank;
1125 atmel_pioctrl->pins[i]->line = line;
1126
1127 pin_desc[i].number = i;
1128
1129 pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
1130 bank + 'A', line);
1131
1132 group->name = group_names[i] = pin_desc[i].name;
1133 group->pin = pin_desc[i].number;
1134
1135 dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
1136 }
1137
1138 atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
1139 atmel_pioctrl->gpio_chip->of_node = dev->of_node;
1140 atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
1141 atmel_pioctrl->gpio_chip->label = dev_name(dev);
1142 atmel_pioctrl->gpio_chip->parent = dev;
1143 atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
1144
1145 atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev,
1146 atmel_pioctrl->nbanks,
1147 sizeof(*atmel_pioctrl->pm_wakeup_sources),
1148 GFP_KERNEL);
1149 if (!atmel_pioctrl->pm_wakeup_sources)
1150 return -ENOMEM;
1151
1152 atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev,
1153 atmel_pioctrl->nbanks,
1154 sizeof(*atmel_pioctrl->pm_suspend_backup),
1155 GFP_KERNEL);
1156 if (!atmel_pioctrl->pm_suspend_backup)
1157 return -ENOMEM;
1158
1159 atmel_pioctrl->irqs = devm_kcalloc(dev,
1160 atmel_pioctrl->nbanks,
1161 sizeof(*atmel_pioctrl->irqs),
1162 GFP_KERNEL);
1163 if (!atmel_pioctrl->irqs)
1164 return -ENOMEM;
1165
1166
1167 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
1168 res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
1169 if (!res) {
1170 dev_err(dev, "missing irq resource for group %c\n",
1171 'A' + i);
1172 return -EINVAL;
1173 }
1174 atmel_pioctrl->irqs[i] = res->start;
1175 irq_set_chained_handler_and_data(res->start,
1176 atmel_gpio_irq_handler, atmel_pioctrl);
1177 dev_dbg(dev, "bank %i: irq=%pr\n", i, res);
1178 }
1179
1180 atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
1181 atmel_pioctrl->gpio_chip->ngpio,
1182 &irq_domain_simple_ops, NULL);
1183 if (!atmel_pioctrl->irq_domain) {
1184 dev_err(dev, "can't add the irq domain\n");
1185 return -ENODEV;
1186 }
1187 atmel_pioctrl->irq_domain->name = "atmel gpio";
1188
1189 for (i = 0; i < atmel_pioctrl->npins; i++) {
1190 int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
1191
1192 irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
1193 handle_simple_irq);
1194 irq_set_chip_data(irq, atmel_pioctrl);
1195 dev_dbg(dev,
1196 "atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
1197 i, irq);
1198 }
1199
1200 ret = clk_prepare_enable(atmel_pioctrl->clk);
1201 if (ret) {
1202 dev_err(dev, "failed to prepare and enable clock\n");
1203 goto clk_prepare_enable_error;
1204 }
1205
1206 atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
1207 &atmel_pinctrl_desc,
1208 atmel_pioctrl);
1209 if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
1210 ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
1211 dev_err(dev, "pinctrl registration failed\n");
1212 goto clk_unprep;
1213 }
1214
1215 ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
1216 if (ret) {
1217 dev_err(dev, "failed to add gpiochip\n");
1218 goto clk_unprep;
1219 }
1220
1221 ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
1222 0, 0, atmel_pioctrl->gpio_chip->ngpio);
1223 if (ret) {
1224 dev_err(dev, "failed to add gpio pin range\n");
1225 goto gpiochip_add_pin_range_error;
1226 }
1227
1228 dev_info(&pdev->dev, "atmel pinctrl initialized\n");
1229
1230 return 0;
1231
1232gpiochip_add_pin_range_error:
1233 gpiochip_remove(atmel_pioctrl->gpio_chip);
1234
1235clk_unprep:
1236 clk_disable_unprepare(atmel_pioctrl->clk);
1237
1238clk_prepare_enable_error:
1239 irq_domain_remove(atmel_pioctrl->irq_domain);
1240
1241 return ret;
1242}
1243
1244static struct platform_driver atmel_pinctrl_driver = {
1245 .driver = {
1246 .name = "pinctrl-at91-pio4",
1247 .of_match_table = atmel_pctrl_of_match,
1248 .pm = &atmel_pctrl_pm_ops,
1249 .suppress_bind_attrs = true,
1250 },
1251 .probe = atmel_pinctrl_probe,
1252};
1253builtin_platform_driver(atmel_pinctrl_driver);
1254
