1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for the Atmel PIO4 controller
4 *
5 * Copyright (C) 2015 Atmel,
6 * 2015 Ludovic Desroches <ludovic.desroches@atmel.com>
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 * Warning:
28 * In order to not introduce confusion between Atmel PIO groups and pinctrl
29 * framework groups, Atmel PIO groups will be called banks, line is kept to
30 * designed the pin id into this bank.
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 /* Custom pinconf parameters */
73 #define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1)
74
75 /**
76 * struct atmel_pioctrl_data - Atmel PIO controller (pinmux + gpio) data struct
77 * @nbanks: number of PIO banks
78 * @last_bank_count: number of lines in the last bank (can be less than
79 * the rest of the banks).
80 * @slew_rate_support: slew rate support
81 */
82 struct atmel_pioctrl_data {
83 unsigned int nbanks;
84 unsigned int last_bank_count;
85 unsigned int slew_rate_support;
86 };
87
88 struct atmel_group {
89 const char *name;
90 u32 pin;
91 };
92
93 struct 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 * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
104 * @reg_base: base address of the controller.
105 * @clk: clock of the controller.
106 * @nbanks: number of PIO groups, it can vary depending on the SoC.
107 * @pinctrl_dev: pinctrl device registered.
108 * @groups: groups table to provide group name and pin in the group to pinctrl.
109 * @group_names: group names table to provide all the group/pin names to
110 * pinctrl or gpio.
111 * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
112 * fields are set at probe time. Other ones are set when parsing dt
113 * pinctrl.
114 * @npins: number of pins.
115 * @gpio_chip: gpio chip registered.
116 * @irq_domain: irq domain for the gpio controller.
117 * @irqs: table containing the hw irq number of the bank. The index of the
118 * table is the bank id.
119 * @pm_wakeup_sources: bitmap of wakeup sources (lines)
120 * @pm_suspend_backup: backup/restore register values on suspend/resume
121 * @dev: device entry for the Atmel PIO controller.
122 * @node: node of the Atmel PIO controller.
123 * @slew_rate_support: slew rate support
124 */
125 struct 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
148 static const char * const atmel_functions[] = {
149 "GPIO", "A", "B", "C", "D", "E", "F", "G"
150 };
151
152 static const struct pinconf_generic_params atmel_custom_bindings[] = {
153 {"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0},
154 };
155
156 /* --- GPIO --- */
atmel_gpio_read(struct atmel_pioctrl * atmel_pioctrl,unsigned int bank,unsigned int reg)157 static 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
atmel_gpio_write(struct atmel_pioctrl * atmel_pioctrl,unsigned int bank,unsigned int reg,unsigned int val)164 static 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
atmel_gpio_irq_ack(struct irq_data * d)172 static void atmel_gpio_irq_ack(struct irq_data *d)
173 {
174 /*
175 * Nothing to do, interrupt is cleared when reading the status
176 * register.
177 */
178 }
179
atmel_gpio_irq_set_type(struct irq_data * d,unsigned int type)180 static 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
atmel_gpio_irq_mask(struct irq_data * d)222 static 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
atmel_gpio_irq_unmask(struct irq_data * d)231 static 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
atmel_gpio_irq_set_wake(struct irq_data * d,unsigned int on)240 static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
241 {
242 struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
243 int bank = ATMEL_PIO_BANK(d->hwirq);
244 int line = ATMEL_PIO_LINE(d->hwirq);
245
246 /* The gpio controller has one interrupt line per bank. */
247 irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
248
249 if (on)
250 atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
251 else
252 atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
253
254 return 0;
255 }
256
257 static struct irq_chip atmel_gpio_irq_chip = {
258 .name = "GPIO",
259 .irq_ack = atmel_gpio_irq_ack,
260 .irq_mask = atmel_gpio_irq_mask,
261 .irq_unmask = atmel_gpio_irq_unmask,
262 .irq_set_type = atmel_gpio_irq_set_type,
263 .irq_set_wake = pm_sleep_ptr(atmel_gpio_irq_set_wake),
264 };
265
atmel_gpio_to_irq(struct gpio_chip * chip,unsigned int offset)266 static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
267 {
268 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
269
270 return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
271 }
272
atmel_gpio_irq_handler(struct irq_desc * desc)273 static void atmel_gpio_irq_handler(struct irq_desc *desc)
274 {
275 unsigned int irq = irq_desc_get_irq(desc);
276 struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
277 struct irq_chip *chip = irq_desc_get_chip(desc);
278 unsigned long isr;
279 int n, bank = -1;
280
281 /* Find from which bank is the irq received. */
282 for (n = 0; n < atmel_pioctrl->nbanks; n++) {
283 if (atmel_pioctrl->irqs[n] == irq) {
284 bank = n;
285 break;
286 }
287 }
288
289 if (bank < 0) {
290 dev_err(atmel_pioctrl->dev,
291 "no bank associated to irq %u\n", irq);
292 return;
293 }
294
295 chained_irq_enter(chip, desc);
296
297 for (;;) {
298 isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
299 ATMEL_PIO_ISR);
300 isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
301 ATMEL_PIO_IMR);
302 if (!isr)
303 break;
304
305 for_each_set_bit(n, &isr, BITS_PER_LONG)
306 generic_handle_irq(atmel_gpio_to_irq(
307 atmel_pioctrl->gpio_chip,
308 bank * ATMEL_PIO_NPINS_PER_BANK + n));
309 }
310
311 chained_irq_exit(chip, desc);
312 }
313
atmel_gpio_direction_input(struct gpio_chip * chip,unsigned int offset)314 static int atmel_gpio_direction_input(struct gpio_chip *chip,
315 unsigned int offset)
316 {
317 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
318 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
319 unsigned int reg;
320
321 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
322 BIT(pin->line));
323 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
324 reg &= ~ATMEL_PIO_DIR_MASK;
325 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
326
327 return 0;
328 }
329
atmel_gpio_get(struct gpio_chip * chip,unsigned int offset)330 static int atmel_gpio_get(struct gpio_chip *chip, unsigned int offset)
331 {
332 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
333 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
334 unsigned int reg;
335
336 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
337
338 return !!(reg & BIT(pin->line));
339 }
340
atmel_gpio_get_multiple(struct gpio_chip * chip,unsigned long * mask,unsigned long * bits)341 static int atmel_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
342 unsigned long *bits)
343 {
344 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
345 unsigned int bank;
346
347 bitmap_zero(bits, atmel_pioctrl->npins);
348
349 for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
350 unsigned int word = bank;
351 unsigned int offset = 0;
352 unsigned int reg;
353
354 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
355 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
356 offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG;
357 #endif
358 if (!mask[word])
359 continue;
360
361 reg = atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_PDSR);
362 bits[word] |= mask[word] & (reg << offset);
363 }
364
365 return 0;
366 }
367
atmel_gpio_direction_output(struct gpio_chip * chip,unsigned int offset,int value)368 static int atmel_gpio_direction_output(struct gpio_chip *chip,
369 unsigned int offset,
370 int value)
371 {
372 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
373 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
374 unsigned int reg;
375
376 atmel_gpio_write(atmel_pioctrl, pin->bank,
377 value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
378 BIT(pin->line));
379
380 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
381 BIT(pin->line));
382 reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
383 reg |= ATMEL_PIO_DIR_MASK;
384 atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
385
386 return 0;
387 }
388
atmel_gpio_set(struct gpio_chip * chip,unsigned int offset,int val)389 static void atmel_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
390 {
391 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
392 struct atmel_pin *pin = atmel_pioctrl->pins[offset];
393
394 atmel_gpio_write(atmel_pioctrl, pin->bank,
395 val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
396 BIT(pin->line));
397 }
398
atmel_gpio_set_multiple(struct gpio_chip * chip,unsigned long * mask,unsigned long * bits)399 static void atmel_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
400 unsigned long *bits)
401 {
402 struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
403 unsigned int bank;
404
405 for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
406 unsigned int bitmask;
407 unsigned int word = bank;
408
409 /*
410 * On a 64-bit platform, BITS_PER_LONG is 64 so it is necessary to iterate over
411 * two 32bit words to handle the whole bitmask
412 */
413 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
414 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
415 #endif
416 if (!mask[word])
417 continue;
418
419 bitmask = mask[word] & bits[word];
420 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_SODR, bitmask);
421
422 bitmask = mask[word] & ~bits[word];
423 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_CODR, bitmask);
424
425 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
426 mask[word] >>= ATMEL_PIO_NPINS_PER_BANK;
427 bits[word] >>= ATMEL_PIO_NPINS_PER_BANK;
428 #endif
429 }
430 }
431
432 static struct gpio_chip atmel_gpio_chip = {
433 .direction_input = atmel_gpio_direction_input,
434 .get = atmel_gpio_get,
435 .get_multiple = atmel_gpio_get_multiple,
436 .direction_output = atmel_gpio_direction_output,
437 .set = atmel_gpio_set,
438 .set_multiple = atmel_gpio_set_multiple,
439 .to_irq = atmel_gpio_to_irq,
440 .base = 0,
441 };
442
443 /* --- PINCTRL --- */
atmel_pin_config_read(struct pinctrl_dev * pctldev,unsigned int pin_id)444 static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
445 unsigned int pin_id)
446 {
447 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
448 unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
449 unsigned int line = atmel_pioctrl->pins[pin_id]->line;
450 void __iomem *addr = atmel_pioctrl->reg_base
451 + bank * ATMEL_PIO_BANK_OFFSET;
452
453 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
454 /* Have to set MSKR first, to access the right pin CFGR. */
455 wmb();
456
457 return readl_relaxed(addr + ATMEL_PIO_CFGR);
458 }
459
atmel_pin_config_write(struct pinctrl_dev * pctldev,unsigned int pin_id,u32 conf)460 static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
461 unsigned int pin_id, u32 conf)
462 {
463 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
464 unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
465 unsigned int line = atmel_pioctrl->pins[pin_id]->line;
466 void __iomem *addr = atmel_pioctrl->reg_base
467 + bank * ATMEL_PIO_BANK_OFFSET;
468
469 writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
470 /* Have to set MSKR first, to access the right pin CFGR. */
471 wmb();
472 writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
473 }
474
atmel_pctl_get_groups_count(struct pinctrl_dev * pctldev)475 static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
476 {
477 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
478
479 return atmel_pioctrl->npins;
480 }
481
atmel_pctl_get_group_name(struct pinctrl_dev * pctldev,unsigned int selector)482 static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
483 unsigned int selector)
484 {
485 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
486
487 return atmel_pioctrl->groups[selector].name;
488 }
489
atmel_pctl_get_group_pins(struct pinctrl_dev * pctldev,unsigned int selector,const unsigned int ** pins,unsigned int * num_pins)490 static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
491 unsigned int selector,
492 const unsigned int **pins,
493 unsigned int *num_pins)
494 {
495 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
496
497 *pins = (unsigned int *)&atmel_pioctrl->groups[selector].pin;
498 *num_pins = 1;
499
500 return 0;
501 }
502
503 static struct atmel_group *
atmel_pctl_find_group_by_pin(struct pinctrl_dev * pctldev,unsigned int pin)504 atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned int pin)
505 {
506 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
507 int i;
508
509 for (i = 0; i < atmel_pioctrl->npins; i++) {
510 struct atmel_group *grp = atmel_pioctrl->groups + i;
511
512 if (grp->pin == pin)
513 return grp;
514 }
515
516 return NULL;
517 }
518
atmel_pctl_xlate_pinfunc(struct pinctrl_dev * pctldev,struct device_node * np,u32 pinfunc,const char ** grp_name,const char ** func_name)519 static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
520 struct device_node *np,
521 u32 pinfunc, const char **grp_name,
522 const char **func_name)
523 {
524 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
525 unsigned int pin_id, func_id;
526 struct atmel_group *grp;
527
528 pin_id = ATMEL_GET_PIN_NO(pinfunc);
529 func_id = ATMEL_GET_PIN_FUNC(pinfunc);
530
531 if (func_id >= ARRAY_SIZE(atmel_functions))
532 return -EINVAL;
533
534 *func_name = atmel_functions[func_id];
535
536 grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
537 if (!grp)
538 return -EINVAL;
539 *grp_name = grp->name;
540
541 atmel_pioctrl->pins[pin_id]->mux = func_id;
542 atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
543 /* Want the device name not the group one. */
544 if (np->parent == atmel_pioctrl->node)
545 atmel_pioctrl->pins[pin_id]->device = np->name;
546 else
547 atmel_pioctrl->pins[pin_id]->device = np->parent->name;
548
549 return 0;
550 }
551
atmel_pctl_dt_subnode_to_map(struct pinctrl_dev * pctldev,struct device_node * np,struct pinctrl_map ** map,unsigned int * reserved_maps,unsigned int * num_maps)552 static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
553 struct device_node *np,
554 struct pinctrl_map **map,
555 unsigned int *reserved_maps,
556 unsigned int *num_maps)
557 {
558 unsigned int num_pins, num_configs, reserve;
559 unsigned long *configs;
560 struct property *pins;
561 u32 pinfunc;
562 int ret, i;
563
564 pins = of_find_property(np, "pinmux", NULL);
565 if (!pins)
566 return -EINVAL;
567
568 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
569 &num_configs);
570 if (ret < 0) {
571 dev_err(pctldev->dev, "%pOF: could not parse node property\n",
572 np);
573 return ret;
574 }
575
576 num_pins = pins->length / sizeof(u32);
577 if (!num_pins) {
578 dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
579 ret = -EINVAL;
580 goto exit;
581 }
582
583 /*
584 * Reserve maps, at least there is a mux map and an optional conf
585 * map for each pin.
586 */
587 reserve = 1;
588 if (num_configs)
589 reserve++;
590 reserve *= num_pins;
591 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
592 reserve);
593 if (ret < 0)
594 goto exit;
595
596 for (i = 0; i < num_pins; i++) {
597 const char *group, *func;
598
599 ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
600 if (ret)
601 goto exit;
602
603 ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
604 &func);
605 if (ret)
606 goto exit;
607
608 pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
609 group, func);
610
611 if (num_configs) {
612 ret = pinctrl_utils_add_map_configs(pctldev, map,
613 reserved_maps, num_maps, group,
614 configs, num_configs,
615 PIN_MAP_TYPE_CONFIGS_GROUP);
616 if (ret < 0)
617 goto exit;
618 }
619 }
620
621 exit:
622 kfree(configs);
623 return ret;
624 }
625
atmel_pctl_dt_node_to_map(struct pinctrl_dev * pctldev,struct device_node * np_config,struct pinctrl_map ** map,unsigned int * num_maps)626 static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
627 struct device_node *np_config,
628 struct pinctrl_map **map,
629 unsigned int *num_maps)
630 {
631 struct device_node *np;
632 unsigned int reserved_maps;
633 int ret;
634
635 *map = NULL;
636 *num_maps = 0;
637 reserved_maps = 0;
638
639 /*
640 * If all the pins of a device have the same configuration (or no one),
641 * it is useless to add a subnode, so directly parse node referenced by
642 * phandle.
643 */
644 ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
645 &reserved_maps, num_maps);
646 if (ret) {
647 for_each_child_of_node(np_config, np) {
648 ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
649 &reserved_maps, num_maps);
650 if (ret < 0) {
651 of_node_put(np);
652 break;
653 }
654 }
655 }
656
657 if (ret < 0) {
658 pinctrl_utils_free_map(pctldev, *map, *num_maps);
659 dev_err(pctldev->dev, "can't create maps for node %pOF\n",
660 np_config);
661 }
662
663 return ret;
664 }
665
666 static const struct pinctrl_ops atmel_pctlops = {
667 .get_groups_count = atmel_pctl_get_groups_count,
668 .get_group_name = atmel_pctl_get_group_name,
669 .get_group_pins = atmel_pctl_get_group_pins,
670 .dt_node_to_map = atmel_pctl_dt_node_to_map,
671 .dt_free_map = pinctrl_utils_free_map,
672 };
673
atmel_pmx_get_functions_count(struct pinctrl_dev * pctldev)674 static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
675 {
676 return ARRAY_SIZE(atmel_functions);
677 }
678
atmel_pmx_get_function_name(struct pinctrl_dev * pctldev,unsigned int selector)679 static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
680 unsigned int selector)
681 {
682 return atmel_functions[selector];
683 }
684
atmel_pmx_get_function_groups(struct pinctrl_dev * pctldev,unsigned int selector,const char * const ** groups,unsigned * const num_groups)685 static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
686 unsigned int selector,
687 const char * const **groups,
688 unsigned * const num_groups)
689 {
690 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
691
692 *groups = atmel_pioctrl->group_names;
693 *num_groups = atmel_pioctrl->npins;
694
695 return 0;
696 }
697
atmel_pmx_set_mux(struct pinctrl_dev * pctldev,unsigned int function,unsigned int group)698 static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
699 unsigned int function,
700 unsigned int group)
701 {
702 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
703 unsigned int pin;
704 u32 conf;
705
706 dev_dbg(pctldev->dev, "enable function %s group %s\n",
707 atmel_functions[function], atmel_pioctrl->groups[group].name);
708
709 pin = atmel_pioctrl->groups[group].pin;
710 conf = atmel_pin_config_read(pctldev, pin);
711 conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
712 conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
713 dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
714 atmel_pin_config_write(pctldev, pin, conf);
715
716 return 0;
717 }
718
719 static const struct pinmux_ops atmel_pmxops = {
720 .get_functions_count = atmel_pmx_get_functions_count,
721 .get_function_name = atmel_pmx_get_function_name,
722 .get_function_groups = atmel_pmx_get_function_groups,
723 .set_mux = atmel_pmx_set_mux,
724 };
725
atmel_conf_pin_config_group_get(struct pinctrl_dev * pctldev,unsigned int group,unsigned long * config)726 static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
727 unsigned int group,
728 unsigned long *config)
729 {
730 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
731 unsigned int param = pinconf_to_config_param(*config), arg = 0;
732 struct atmel_group *grp = atmel_pioctrl->groups + group;
733 unsigned int pin_id = grp->pin;
734 u32 res;
735
736 res = atmel_pin_config_read(pctldev, pin_id);
737
738 switch (param) {
739 case PIN_CONFIG_BIAS_PULL_UP:
740 if (!(res & ATMEL_PIO_PUEN_MASK))
741 return -EINVAL;
742 arg = 1;
743 break;
744 case PIN_CONFIG_BIAS_PULL_DOWN:
745 if ((res & ATMEL_PIO_PUEN_MASK) ||
746 (!(res & ATMEL_PIO_PDEN_MASK)))
747 return -EINVAL;
748 arg = 1;
749 break;
750 case PIN_CONFIG_BIAS_DISABLE:
751 if ((res & ATMEL_PIO_PUEN_MASK) ||
752 ((res & ATMEL_PIO_PDEN_MASK)))
753 return -EINVAL;
754 arg = 1;
755 break;
756 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
757 if (!(res & ATMEL_PIO_OPD_MASK))
758 return -EINVAL;
759 arg = 1;
760 break;
761 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
762 if (!(res & ATMEL_PIO_SCHMITT_MASK))
763 return -EINVAL;
764 arg = 1;
765 break;
766 case PIN_CONFIG_SLEW_RATE:
767 if (!atmel_pioctrl->slew_rate_support)
768 return -EOPNOTSUPP;
769 if (!(res & ATMEL_PIO_SR_MASK))
770 return -EINVAL;
771 arg = 1;
772 break;
773 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
774 if (!(res & ATMEL_PIO_DRVSTR_MASK))
775 return -EINVAL;
776 arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET;
777 break;
778 default:
779 return -ENOTSUPP;
780 }
781
782 *config = pinconf_to_config_packed(param, arg);
783 return 0;
784 }
785
atmel_conf_pin_config_group_set(struct pinctrl_dev * pctldev,unsigned int group,unsigned long * configs,unsigned int num_configs)786 static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
787 unsigned int group,
788 unsigned long *configs,
789 unsigned int num_configs)
790 {
791 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
792 struct atmel_group *grp = atmel_pioctrl->groups + group;
793 unsigned int bank, pin, pin_id = grp->pin;
794 u32 mask, conf = 0;
795 int i;
796
797 conf = atmel_pin_config_read(pctldev, pin_id);
798
799 /* Keep slew rate enabled by default. */
800 if (atmel_pioctrl->slew_rate_support)
801 conf |= ATMEL_PIO_SR_MASK;
802
803 for (i = 0; i < num_configs; i++) {
804 unsigned int param = pinconf_to_config_param(configs[i]);
805 unsigned int arg = pinconf_to_config_argument(configs[i]);
806
807 dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
808 __func__, pin_id, configs[i]);
809
810 switch (param) {
811 case PIN_CONFIG_BIAS_DISABLE:
812 conf &= (~ATMEL_PIO_PUEN_MASK);
813 conf &= (~ATMEL_PIO_PDEN_MASK);
814 break;
815 case PIN_CONFIG_BIAS_PULL_UP:
816 conf |= ATMEL_PIO_PUEN_MASK;
817 conf &= (~ATMEL_PIO_PDEN_MASK);
818 break;
819 case PIN_CONFIG_BIAS_PULL_DOWN:
820 conf |= ATMEL_PIO_PDEN_MASK;
821 conf &= (~ATMEL_PIO_PUEN_MASK);
822 break;
823 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
824 if (arg == 0)
825 conf &= (~ATMEL_PIO_OPD_MASK);
826 else
827 conf |= ATMEL_PIO_OPD_MASK;
828 break;
829 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
830 if (arg == 0)
831 conf |= ATMEL_PIO_SCHMITT_MASK;
832 else
833 conf &= (~ATMEL_PIO_SCHMITT_MASK);
834 break;
835 case PIN_CONFIG_INPUT_DEBOUNCE:
836 if (arg == 0) {
837 conf &= (~ATMEL_PIO_IFEN_MASK);
838 conf &= (~ATMEL_PIO_IFSCEN_MASK);
839 } else {
840 /*
841 * We don't care about the debounce value for several reasons:
842 * - can't have different debounce periods inside a same group,
843 * - the register to configure this period is a secure register.
844 * The debouncing filter can filter a pulse with a duration of less
845 * than 1/2 slow clock period.
846 */
847 conf |= ATMEL_PIO_IFEN_MASK;
848 conf |= ATMEL_PIO_IFSCEN_MASK;
849 }
850 break;
851 case PIN_CONFIG_OUTPUT:
852 conf |= ATMEL_PIO_DIR_MASK;
853 bank = ATMEL_PIO_BANK(pin_id);
854 pin = ATMEL_PIO_LINE(pin_id);
855 mask = 1 << pin;
856
857 if (arg == 0) {
858 writel_relaxed(mask, atmel_pioctrl->reg_base +
859 bank * ATMEL_PIO_BANK_OFFSET +
860 ATMEL_PIO_CODR);
861 } else {
862 writel_relaxed(mask, atmel_pioctrl->reg_base +
863 bank * ATMEL_PIO_BANK_OFFSET +
864 ATMEL_PIO_SODR);
865 }
866 break;
867 case PIN_CONFIG_SLEW_RATE:
868 if (!atmel_pioctrl->slew_rate_support)
869 break;
870 /* And remove it if explicitly requested. */
871 if (arg == 0)
872 conf &= ~ATMEL_PIO_SR_MASK;
873 break;
874 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
875 switch (arg) {
876 case ATMEL_PIO_DRVSTR_LO:
877 case ATMEL_PIO_DRVSTR_ME:
878 case ATMEL_PIO_DRVSTR_HI:
879 conf &= (~ATMEL_PIO_DRVSTR_MASK);
880 conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
881 break;
882 default:
883 dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
884 }
885 break;
886 default:
887 dev_warn(pctldev->dev,
888 "unsupported configuration parameter: %u\n",
889 param);
890 continue;
891 }
892 }
893
894 dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
895 atmel_pin_config_write(pctldev, pin_id, conf);
896
897 return 0;
898 }
899
atmel_conf_pin_config_dbg_show(struct pinctrl_dev * pctldev,struct seq_file * s,unsigned int pin_id)900 static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
901 struct seq_file *s,
902 unsigned int pin_id)
903 {
904 struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
905 u32 conf;
906
907 if (!atmel_pioctrl->pins[pin_id]->device)
908 return;
909
910 if (atmel_pioctrl->pins[pin_id])
911 seq_printf(s, " (%s, ioset %u) ",
912 atmel_pioctrl->pins[pin_id]->device,
913 atmel_pioctrl->pins[pin_id]->ioset);
914
915 conf = atmel_pin_config_read(pctldev, pin_id);
916 if (conf & ATMEL_PIO_PUEN_MASK)
917 seq_printf(s, "%s ", "pull-up");
918 if (conf & ATMEL_PIO_PDEN_MASK)
919 seq_printf(s, "%s ", "pull-down");
920 if (conf & ATMEL_PIO_IFEN_MASK)
921 seq_printf(s, "%s ", "debounce");
922 if (conf & ATMEL_PIO_OPD_MASK)
923 seq_printf(s, "%s ", "open-drain");
924 if (conf & ATMEL_PIO_SCHMITT_MASK)
925 seq_printf(s, "%s ", "schmitt");
926 if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
927 seq_printf(s, "%s ", "slew-rate");
928 if (conf & ATMEL_PIO_DRVSTR_MASK) {
929 switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
930 case ATMEL_PIO_DRVSTR_ME:
931 seq_printf(s, "%s ", "medium-drive");
932 break;
933 case ATMEL_PIO_DRVSTR_HI:
934 seq_printf(s, "%s ", "high-drive");
935 break;
936 /* ATMEL_PIO_DRVSTR_LO and 0 which is the default value at reset */
937 default:
938 seq_printf(s, "%s ", "low-drive");
939 }
940 }
941 }
942
943 static const struct pinconf_ops atmel_confops = {
944 .pin_config_group_get = atmel_conf_pin_config_group_get,
945 .pin_config_group_set = atmel_conf_pin_config_group_set,
946 .pin_config_dbg_show = atmel_conf_pin_config_dbg_show,
947 };
948
949 static struct pinctrl_desc atmel_pinctrl_desc = {
950 .name = "atmel_pinctrl",
951 .confops = &atmel_confops,
952 .pctlops = &atmel_pctlops,
953 .pmxops = &atmel_pmxops,
954 };
955
atmel_pctrl_suspend(struct device * dev)956 static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
957 {
958 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
959 int i, j;
960
961 /*
962 * For each bank, save IMR to restore it later and disable all GPIO
963 * interrupts excepting the ones marked as wakeup sources.
964 */
965 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
966 atmel_pioctrl->pm_suspend_backup[i].imr =
967 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
968 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
969 ~atmel_pioctrl->pm_wakeup_sources[i]);
970 atmel_pioctrl->pm_suspend_backup[i].odsr =
971 atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
972 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
973 atmel_gpio_write(atmel_pioctrl, i,
974 ATMEL_PIO_MSKR, BIT(j));
975 atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
976 atmel_gpio_read(atmel_pioctrl, i,
977 ATMEL_PIO_CFGR);
978 }
979 }
980
981 return 0;
982 }
983
atmel_pctrl_resume(struct device * dev)984 static int __maybe_unused atmel_pctrl_resume(struct device *dev)
985 {
986 struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
987 int i, j;
988
989 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
990 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
991 atmel_pioctrl->pm_suspend_backup[i].imr);
992 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
993 atmel_pioctrl->pm_suspend_backup[i].odsr);
994 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
995 atmel_gpio_write(atmel_pioctrl, i,
996 ATMEL_PIO_MSKR, BIT(j));
997 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
998 atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
999 }
1000 }
1001
1002 return 0;
1003 }
1004
1005 static const struct dev_pm_ops atmel_pctrl_pm_ops = {
1006 SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
1007 };
1008
1009 /*
1010 * The number of banks can be different from a SoC to another one.
1011 * We can have up to 16 banks.
1012 */
1013 static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
1014 .nbanks = 4,
1015 .last_bank_count = ATMEL_PIO_NPINS_PER_BANK,
1016 };
1017
1018 static const struct atmel_pioctrl_data microchip_sama7g5_pioctrl_data = {
1019 .nbanks = 5,
1020 .last_bank_count = 8, /* sama7g5 has only PE0 to PE7 */
1021 .slew_rate_support = 1,
1022 };
1023
1024 static const struct of_device_id atmel_pctrl_of_match[] = {
1025 {
1026 .compatible = "atmel,sama5d2-pinctrl",
1027 .data = &atmel_sama5d2_pioctrl_data,
1028 }, {
1029 .compatible = "microchip,sama7g5-pinctrl",
1030 .data = µchip_sama7g5_pioctrl_data,
1031 }, {
1032 /* sentinel */
1033 }
1034 };
1035
atmel_pinctrl_probe(struct platform_device * pdev)1036 static int atmel_pinctrl_probe(struct platform_device *pdev)
1037 {
1038 struct device *dev = &pdev->dev;
1039 struct pinctrl_pin_desc *pin_desc;
1040 const char **group_names;
1041 const struct of_device_id *match;
1042 int i, ret;
1043 struct atmel_pioctrl *atmel_pioctrl;
1044 const struct atmel_pioctrl_data *atmel_pioctrl_data;
1045
1046 atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
1047 if (!atmel_pioctrl)
1048 return -ENOMEM;
1049 atmel_pioctrl->dev = dev;
1050 atmel_pioctrl->node = dev->of_node;
1051 platform_set_drvdata(pdev, atmel_pioctrl);
1052
1053 match = of_match_node(atmel_pctrl_of_match, dev->of_node);
1054 if (!match) {
1055 dev_err(dev, "unknown compatible string\n");
1056 return -ENODEV;
1057 }
1058 atmel_pioctrl_data = match->data;
1059 atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
1060 atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
1061 /* if last bank has limited number of pins, adjust accordingly */
1062 if (atmel_pioctrl_data->last_bank_count != ATMEL_PIO_NPINS_PER_BANK) {
1063 atmel_pioctrl->npins -= ATMEL_PIO_NPINS_PER_BANK;
1064 atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
1065 }
1066 atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
1067
1068 atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
1069 if (IS_ERR(atmel_pioctrl->reg_base))
1070 return PTR_ERR(atmel_pioctrl->reg_base);
1071
1072 atmel_pioctrl->clk = devm_clk_get(dev, NULL);
1073 if (IS_ERR(atmel_pioctrl->clk)) {
1074 dev_err(dev, "failed to get clock\n");
1075 return PTR_ERR(atmel_pioctrl->clk);
1076 }
1077
1078 atmel_pioctrl->pins = devm_kcalloc(dev,
1079 atmel_pioctrl->npins,
1080 sizeof(*atmel_pioctrl->pins),
1081 GFP_KERNEL);
1082 if (!atmel_pioctrl->pins)
1083 return -ENOMEM;
1084
1085 pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc),
1086 GFP_KERNEL);
1087 if (!pin_desc)
1088 return -ENOMEM;
1089 atmel_pinctrl_desc.pins = pin_desc;
1090 atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
1091 atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings);
1092 atmel_pinctrl_desc.custom_params = atmel_custom_bindings;
1093
1094 /* One pin is one group since a pin can achieve all functions. */
1095 group_names = devm_kcalloc(dev,
1096 atmel_pioctrl->npins, sizeof(*group_names),
1097 GFP_KERNEL);
1098 if (!group_names)
1099 return -ENOMEM;
1100 atmel_pioctrl->group_names = group_names;
1101
1102 atmel_pioctrl->groups = devm_kcalloc(&pdev->dev,
1103 atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups),
1104 GFP_KERNEL);
1105 if (!atmel_pioctrl->groups)
1106 return -ENOMEM;
1107 for (i = 0 ; i < atmel_pioctrl->npins; i++) {
1108 struct atmel_group *group = atmel_pioctrl->groups + i;
1109 unsigned int bank = ATMEL_PIO_BANK(i);
1110 unsigned int line = ATMEL_PIO_LINE(i);
1111
1112 atmel_pioctrl->pins[i] = devm_kzalloc(dev,
1113 sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
1114 if (!atmel_pioctrl->pins[i])
1115 return -ENOMEM;
1116
1117 atmel_pioctrl->pins[i]->pin_id = i;
1118 atmel_pioctrl->pins[i]->bank = bank;
1119 atmel_pioctrl->pins[i]->line = line;
1120
1121 pin_desc[i].number = i;
1122 /* Pin naming convention: P(bank_name)(bank_pin_number). */
1123 pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
1124 bank + 'A', line);
1125
1126 group->name = group_names[i] = pin_desc[i].name;
1127 group->pin = pin_desc[i].number;
1128
1129 dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
1130 }
1131
1132 atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
1133 atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
1134 atmel_pioctrl->gpio_chip->label = dev_name(dev);
1135 atmel_pioctrl->gpio_chip->parent = dev;
1136 atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
1137
1138 atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev,
1139 atmel_pioctrl->nbanks,
1140 sizeof(*atmel_pioctrl->pm_wakeup_sources),
1141 GFP_KERNEL);
1142 if (!atmel_pioctrl->pm_wakeup_sources)
1143 return -ENOMEM;
1144
1145 atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev,
1146 atmel_pioctrl->nbanks,
1147 sizeof(*atmel_pioctrl->pm_suspend_backup),
1148 GFP_KERNEL);
1149 if (!atmel_pioctrl->pm_suspend_backup)
1150 return -ENOMEM;
1151
1152 atmel_pioctrl->irqs = devm_kcalloc(dev,
1153 atmel_pioctrl->nbanks,
1154 sizeof(*atmel_pioctrl->irqs),
1155 GFP_KERNEL);
1156 if (!atmel_pioctrl->irqs)
1157 return -ENOMEM;
1158
1159 /* There is one controller but each bank has its own irq line. */
1160 for (i = 0; i < atmel_pioctrl->nbanks; i++) {
1161 ret = platform_get_irq(pdev, i);
1162 if (ret < 0) {
1163 dev_dbg(dev, "missing irq resource for group %c\n",
1164 'A' + i);
1165 return ret;
1166 }
1167 atmel_pioctrl->irqs[i] = ret;
1168 irq_set_chained_handler_and_data(ret, atmel_gpio_irq_handler, atmel_pioctrl);
1169 dev_dbg(dev, "bank %i: irq=%d\n", i, ret);
1170 }
1171
1172 atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
1173 atmel_pioctrl->gpio_chip->ngpio,
1174 &irq_domain_simple_ops, NULL);
1175 if (!atmel_pioctrl->irq_domain) {
1176 dev_err(dev, "can't add the irq domain\n");
1177 return -ENODEV;
1178 }
1179 atmel_pioctrl->irq_domain->name = "atmel gpio";
1180
1181 for (i = 0; i < atmel_pioctrl->npins; i++) {
1182 int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
1183
1184 irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
1185 handle_simple_irq);
1186 irq_set_chip_data(irq, atmel_pioctrl);
1187 dev_dbg(dev,
1188 "atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
1189 i, irq);
1190 }
1191
1192 ret = clk_prepare_enable(atmel_pioctrl->clk);
1193 if (ret) {
1194 dev_err(dev, "failed to prepare and enable clock\n");
1195 goto clk_prepare_enable_error;
1196 }
1197
1198 atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
1199 &atmel_pinctrl_desc,
1200 atmel_pioctrl);
1201 if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
1202 ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
1203 dev_err(dev, "pinctrl registration failed\n");
1204 goto clk_unprep;
1205 }
1206
1207 ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
1208 if (ret) {
1209 dev_err(dev, "failed to add gpiochip\n");
1210 goto clk_unprep;
1211 }
1212
1213 ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
1214 0, 0, atmel_pioctrl->gpio_chip->ngpio);
1215 if (ret) {
1216 dev_err(dev, "failed to add gpio pin range\n");
1217 goto gpiochip_add_pin_range_error;
1218 }
1219
1220 dev_info(&pdev->dev, "atmel pinctrl initialized\n");
1221
1222 return 0;
1223
1224 gpiochip_add_pin_range_error:
1225 gpiochip_remove(atmel_pioctrl->gpio_chip);
1226
1227 clk_unprep:
1228 clk_disable_unprepare(atmel_pioctrl->clk);
1229
1230 clk_prepare_enable_error:
1231 irq_domain_remove(atmel_pioctrl->irq_domain);
1232
1233 return ret;
1234 }
1235
1236 static struct platform_driver atmel_pinctrl_driver = {
1237 .driver = {
1238 .name = "pinctrl-at91-pio4",
1239 .of_match_table = atmel_pctrl_of_match,
1240 .pm = &atmel_pctrl_pm_ops,
1241 .suppress_bind_attrs = true,
1242 },
1243 .probe = atmel_pinctrl_probe,
1244 };
1245 builtin_platform_driver(atmel_pinctrl_driver);
1246
