1 // SPDX-License-Identifier: GPL-2.0-only
3 * at91 pinctrl driver based on at91 pinmux core
5 * Copyright (C) 2011-2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
10 #include <linux/init.h>
12 #include <linux/of_device.h>
13 #include <linux/of_address.h>
14 #include <linux/of_irq.h>
15 #include <linux/slab.h>
16 #include <linux/interrupt.h>
18 #include <linux/gpio/driver.h>
19 #include <linux/pinctrl/machine.h>
20 #include <linux/pinctrl/pinconf.h>
21 #include <linux/pinctrl/pinctrl.h>
22 #include <linux/pinctrl/pinmux.h>
23 /* Since we request GPIOs from ourself */
24 #include <linux/pinctrl/consumer.h>
26 #include <soc/at91/pm.h>
28 #include "pinctrl-at91.h"
31 #define MAX_GPIO_BANKS 5
32 #define MAX_NB_GPIO_PER_BANK 32
34 struct at91_pinctrl_mux_ops;
36 struct at91_gpio_chip {
37 struct gpio_chip chip;
38 struct pinctrl_gpio_range range;
39 struct at91_gpio_chip *next; /* Bank sharing same clock */
40 int pioc_hwirq; /* PIO bank interrupt identifier on AIC */
41 int pioc_virq; /* PIO bank Linux virtual interrupt */
42 int pioc_idx; /* PIO bank index */
43 void __iomem *regbase; /* PIO bank virtual address */
44 struct clk *clock; /* associated clock */
45 const struct at91_pinctrl_mux_ops *ops; /* ops */
48 static struct at91_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
50 static int gpio_banks;
52 #define PULL_UP (1 << 0)
53 #define MULTI_DRIVE (1 << 1)
54 #define DEGLITCH (1 << 2)
55 #define PULL_DOWN (1 << 3)
56 #define DIS_SCHMIT (1 << 4)
57 #define DRIVE_STRENGTH_SHIFT 5
58 #define DRIVE_STRENGTH_MASK 0x3
59 #define DRIVE_STRENGTH (DRIVE_STRENGTH_MASK << DRIVE_STRENGTH_SHIFT)
60 #define OUTPUT (1 << 7)
61 #define OUTPUT_VAL_SHIFT 8
62 #define OUTPUT_VAL (0x1 << OUTPUT_VAL_SHIFT)
63 #define SLEWRATE_SHIFT 9
64 #define SLEWRATE_MASK 0x1
65 #define SLEWRATE (SLEWRATE_MASK << SLEWRATE_SHIFT)
66 #define DEBOUNCE (1 << 16)
67 #define DEBOUNCE_VAL_SHIFT 17
68 #define DEBOUNCE_VAL (0x3fff << DEBOUNCE_VAL_SHIFT)
71 * These defines will translated the dt binding settings to our internal
72 * settings. They are not necessarily the same value as the register setting.
73 * The actual drive strength current of low, medium and high must be looked up
74 * from the corresponding device datasheet. This value is different for pins
75 * that are even in the same banks. It is also dependent on VCC.
76 * DRIVE_STRENGTH_DEFAULT is just a placeholder to avoid changing the drive
77 * strength when there is no dt config for it.
79 enum drive_strength_bit {
80 DRIVE_STRENGTH_BIT_DEF,
81 DRIVE_STRENGTH_BIT_LOW,
82 DRIVE_STRENGTH_BIT_MED,
83 DRIVE_STRENGTH_BIT_HI,
86 #define DRIVE_STRENGTH_BIT_MSK(name) (DRIVE_STRENGTH_BIT_##name << \
94 #define SLEWRATE_BIT_MSK(name) (SLEWRATE_BIT_##name << SLEWRATE_SHIFT)
97 * struct at91_pmx_func - describes AT91 pinmux functions
98 * @name: the name of this specific function
99 * @groups: corresponding pin groups
100 * @ngroups: the number of groups
102 struct at91_pmx_func {
110 AT91_MUX_PERIPH_A = 1,
111 AT91_MUX_PERIPH_B = 2,
112 AT91_MUX_PERIPH_C = 3,
113 AT91_MUX_PERIPH_D = 4,
117 * struct at91_pmx_pin - describes an At91 pin mux
118 * @bank: the bank of the pin
119 * @pin: the pin number in the @bank
120 * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
121 * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
123 struct at91_pmx_pin {
131 * struct at91_pin_group - describes an At91 pin group
132 * @name: the name of this specific pin group
133 * @pins_conf: the mux mode for each pin in this group. The size of this
134 * array is the same as pins.
135 * @pins: an array of discrete physical pins used in this group, taken
136 * from the driver-local pin enumeration space
137 * @npins: the number of pins in this group array, i.e. the number of
138 * elements in .pins so we can iterate over that array
140 struct at91_pin_group {
142 struct at91_pmx_pin *pins_conf;
148 * struct at91_pinctrl_mux_ops - describes an AT91 mux ops group
149 * on new IP with support for periph C and D the way to mux in
150 * periph A and B has changed
151 * So provide the right call back
152 * if not present means the IP does not support it
153 * @get_periph: return the periph mode configured
154 * @mux_A_periph: mux as periph A
155 * @mux_B_periph: mux as periph B
156 * @mux_C_periph: mux as periph C
157 * @mux_D_periph: mux as periph D
158 * @get_deglitch: get deglitch status
159 * @set_deglitch: enable/disable deglitch
160 * @get_debounce: get debounce status
161 * @set_debounce: enable/disable debounce
162 * @get_pulldown: get pulldown status
163 * @set_pulldown: enable/disable pulldown
164 * @get_schmitt_trig: get schmitt trigger status
165 * @disable_schmitt_trig: disable schmitt trigger
166 * @get_drivestrength: get driver strength
167 * @set_drivestrength: set driver strength
168 * @get_slewrate: get slew rate
169 * @set_slewrate: set slew rate
170 * @irq_type: return irq type
172 struct at91_pinctrl_mux_ops {
173 enum at91_mux (*get_periph)(void __iomem *pio, unsigned mask);
174 void (*mux_A_periph)(void __iomem *pio, unsigned mask);
175 void (*mux_B_periph)(void __iomem *pio, unsigned mask);
176 void (*mux_C_periph)(void __iomem *pio, unsigned mask);
177 void (*mux_D_periph)(void __iomem *pio, unsigned mask);
178 bool (*get_deglitch)(void __iomem *pio, unsigned pin);
179 void (*set_deglitch)(void __iomem *pio, unsigned mask, bool is_on);
180 bool (*get_debounce)(void __iomem *pio, unsigned pin, u32 *div);
181 void (*set_debounce)(void __iomem *pio, unsigned mask, bool is_on, u32 div);
182 bool (*get_pulldown)(void __iomem *pio, unsigned pin);
183 void (*set_pulldown)(void __iomem *pio, unsigned mask, bool is_on);
184 bool (*get_schmitt_trig)(void __iomem *pio, unsigned pin);
185 void (*disable_schmitt_trig)(void __iomem *pio, unsigned mask);
186 unsigned (*get_drivestrength)(void __iomem *pio, unsigned pin);
187 void (*set_drivestrength)(void __iomem *pio, unsigned pin,
189 unsigned (*get_slewrate)(void __iomem *pio, unsigned pin);
190 void (*set_slewrate)(void __iomem *pio, unsigned pin, u32 slewrate);
192 int (*irq_type)(struct irq_data *d, unsigned type);
195 static int gpio_irq_type(struct irq_data *d, unsigned type);
196 static int alt_gpio_irq_type(struct irq_data *d, unsigned type);
198 struct at91_pinctrl {
200 struct pinctrl_dev *pctl;
207 struct at91_pmx_func *functions;
210 struct at91_pin_group *groups;
213 const struct at91_pinctrl_mux_ops *ops;
216 static inline const struct at91_pin_group *at91_pinctrl_find_group_by_name(
217 const struct at91_pinctrl *info,
220 const struct at91_pin_group *grp = NULL;
223 for (i = 0; i < info->ngroups; i++) {
224 if (strcmp(info->groups[i].name, name))
227 grp = &info->groups[i];
228 dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins, grp->pins[0]);
235 static int at91_get_groups_count(struct pinctrl_dev *pctldev)
237 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
239 return info->ngroups;
242 static const char *at91_get_group_name(struct pinctrl_dev *pctldev,
245 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
247 return info->groups[selector].name;
250 static int at91_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
251 const unsigned **pins,
254 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
256 if (selector >= info->ngroups)
259 *pins = info->groups[selector].pins;
260 *npins = info->groups[selector].npins;
265 static void at91_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
268 seq_printf(s, "%s", dev_name(pctldev->dev));
271 static int at91_dt_node_to_map(struct pinctrl_dev *pctldev,
272 struct device_node *np,
273 struct pinctrl_map **map, unsigned *num_maps)
275 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
276 const struct at91_pin_group *grp;
277 struct pinctrl_map *new_map;
278 struct device_node *parent;
283 * first find the group of this node and check if we need to create
284 * config maps for pins
286 grp = at91_pinctrl_find_group_by_name(info, np->name);
288 dev_err(info->dev, "unable to find group for node %pOFn\n",
293 map_num += grp->npins;
294 new_map = devm_kcalloc(pctldev->dev, map_num, sizeof(*new_map),
303 parent = of_get_parent(np);
305 devm_kfree(pctldev->dev, new_map);
308 new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
309 new_map[0].data.mux.function = parent->name;
310 new_map[0].data.mux.group = np->name;
313 /* create config map */
315 for (i = 0; i < grp->npins; i++) {
316 new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
317 new_map[i].data.configs.group_or_pin =
318 pin_get_name(pctldev, grp->pins[i]);
319 new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
320 new_map[i].data.configs.num_configs = 1;
323 dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
324 (*map)->data.mux.function, (*map)->data.mux.group, map_num);
329 static void at91_dt_free_map(struct pinctrl_dev *pctldev,
330 struct pinctrl_map *map, unsigned num_maps)
334 static const struct pinctrl_ops at91_pctrl_ops = {
335 .get_groups_count = at91_get_groups_count,
336 .get_group_name = at91_get_group_name,
337 .get_group_pins = at91_get_group_pins,
338 .pin_dbg_show = at91_pin_dbg_show,
339 .dt_node_to_map = at91_dt_node_to_map,
340 .dt_free_map = at91_dt_free_map,
343 static void __iomem *pin_to_controller(struct at91_pinctrl *info,
346 if (!gpio_chips[bank])
349 return gpio_chips[bank]->regbase;
352 static inline int pin_to_bank(unsigned pin)
354 return pin /= MAX_NB_GPIO_PER_BANK;
357 static unsigned pin_to_mask(unsigned int pin)
362 static unsigned two_bit_pin_value_shift_amount(unsigned int pin)
364 /* return the shift value for a pin for "two bit" per pin registers,
365 * i.e. drive strength */
366 return 2*((pin >= MAX_NB_GPIO_PER_BANK/2)
367 ? pin - MAX_NB_GPIO_PER_BANK/2 : pin);
370 static unsigned sama5d3_get_drive_register(unsigned int pin)
372 /* drive strength is split between two registers
373 * with two bits per pin */
374 return (pin >= MAX_NB_GPIO_PER_BANK/2)
375 ? SAMA5D3_PIO_DRIVER2 : SAMA5D3_PIO_DRIVER1;
378 static unsigned at91sam9x5_get_drive_register(unsigned int pin)
380 /* drive strength is split between two registers
381 * with two bits per pin */
382 return (pin >= MAX_NB_GPIO_PER_BANK/2)
383 ? AT91SAM9X5_PIO_DRIVER2 : AT91SAM9X5_PIO_DRIVER1;
386 static void at91_mux_disable_interrupt(void __iomem *pio, unsigned mask)
388 writel_relaxed(mask, pio + PIO_IDR);
391 static unsigned at91_mux_get_pullup(void __iomem *pio, unsigned pin)
393 return !((readl_relaxed(pio + PIO_PUSR) >> pin) & 0x1);
396 static void at91_mux_set_pullup(void __iomem *pio, unsigned mask, bool on)
399 writel_relaxed(mask, pio + PIO_PPDDR);
401 writel_relaxed(mask, pio + (on ? PIO_PUER : PIO_PUDR));
404 static bool at91_mux_get_output(void __iomem *pio, unsigned int pin, bool *val)
406 *val = (readl_relaxed(pio + PIO_ODSR) >> pin) & 0x1;
407 return (readl_relaxed(pio + PIO_OSR) >> pin) & 0x1;
410 static void at91_mux_set_output(void __iomem *pio, unsigned int mask,
411 bool is_on, bool val)
413 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
414 writel_relaxed(mask, pio + (is_on ? PIO_OER : PIO_ODR));
417 static unsigned at91_mux_get_multidrive(void __iomem *pio, unsigned pin)
419 return (readl_relaxed(pio + PIO_MDSR) >> pin) & 0x1;
422 static void at91_mux_set_multidrive(void __iomem *pio, unsigned mask, bool on)
424 writel_relaxed(mask, pio + (on ? PIO_MDER : PIO_MDDR));
427 static void at91_mux_set_A_periph(void __iomem *pio, unsigned mask)
429 writel_relaxed(mask, pio + PIO_ASR);
432 static void at91_mux_set_B_periph(void __iomem *pio, unsigned mask)
434 writel_relaxed(mask, pio + PIO_BSR);
437 static void at91_mux_pio3_set_A_periph(void __iomem *pio, unsigned mask)
440 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask,
442 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
446 static void at91_mux_pio3_set_B_periph(void __iomem *pio, unsigned mask)
448 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask,
450 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) & ~mask,
454 static void at91_mux_pio3_set_C_periph(void __iomem *pio, unsigned mask)
456 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) & ~mask, pio + PIO_ABCDSR1);
457 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
460 static void at91_mux_pio3_set_D_periph(void __iomem *pio, unsigned mask)
462 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR1) | mask, pio + PIO_ABCDSR1);
463 writel_relaxed(readl_relaxed(pio + PIO_ABCDSR2) | mask, pio + PIO_ABCDSR2);
466 static enum at91_mux at91_mux_pio3_get_periph(void __iomem *pio, unsigned mask)
470 if (readl_relaxed(pio + PIO_PSR) & mask)
471 return AT91_MUX_GPIO;
473 select = !!(readl_relaxed(pio + PIO_ABCDSR1) & mask);
474 select |= (!!(readl_relaxed(pio + PIO_ABCDSR2) & mask) << 1);
479 static enum at91_mux at91_mux_get_periph(void __iomem *pio, unsigned mask)
483 if (readl_relaxed(pio + PIO_PSR) & mask)
484 return AT91_MUX_GPIO;
486 select = readl_relaxed(pio + PIO_ABSR) & mask;
491 static bool at91_mux_get_deglitch(void __iomem *pio, unsigned pin)
493 return (readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1;
496 static void at91_mux_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
498 writel_relaxed(mask, pio + (is_on ? PIO_IFER : PIO_IFDR));
501 static bool at91_mux_pio3_get_deglitch(void __iomem *pio, unsigned pin)
503 if ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1)
504 return !((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
509 static void at91_mux_pio3_set_deglitch(void __iomem *pio, unsigned mask, bool is_on)
512 writel_relaxed(mask, pio + PIO_IFSCDR);
513 at91_mux_set_deglitch(pio, mask, is_on);
516 static bool at91_mux_pio3_get_debounce(void __iomem *pio, unsigned pin, u32 *div)
518 *div = readl_relaxed(pio + PIO_SCDR);
520 return ((readl_relaxed(pio + PIO_IFSR) >> pin) & 0x1) &&
521 ((readl_relaxed(pio + PIO_IFSCSR) >> pin) & 0x1);
524 static void at91_mux_pio3_set_debounce(void __iomem *pio, unsigned mask,
528 writel_relaxed(mask, pio + PIO_IFSCER);
529 writel_relaxed(div & PIO_SCDR_DIV, pio + PIO_SCDR);
530 writel_relaxed(mask, pio + PIO_IFER);
532 writel_relaxed(mask, pio + PIO_IFSCDR);
535 static bool at91_mux_pio3_get_pulldown(void __iomem *pio, unsigned pin)
537 return !((readl_relaxed(pio + PIO_PPDSR) >> pin) & 0x1);
540 static void at91_mux_pio3_set_pulldown(void __iomem *pio, unsigned mask, bool is_on)
543 writel_relaxed(mask, pio + PIO_PUDR);
545 writel_relaxed(mask, pio + (is_on ? PIO_PPDER : PIO_PPDDR));
548 static void at91_mux_pio3_disable_schmitt_trig(void __iomem *pio, unsigned mask)
550 writel_relaxed(readl_relaxed(pio + PIO_SCHMITT) | mask, pio + PIO_SCHMITT);
553 static bool at91_mux_pio3_get_schmitt_trig(void __iomem *pio, unsigned pin)
555 return (readl_relaxed(pio + PIO_SCHMITT) >> pin) & 0x1;
558 static inline u32 read_drive_strength(void __iomem *reg, unsigned pin)
560 unsigned tmp = readl_relaxed(reg);
562 tmp = tmp >> two_bit_pin_value_shift_amount(pin);
564 return tmp & DRIVE_STRENGTH_MASK;
567 static unsigned at91_mux_sama5d3_get_drivestrength(void __iomem *pio,
570 unsigned tmp = read_drive_strength(pio +
571 sama5d3_get_drive_register(pin), pin);
573 /* SAMA5 strength is 1:1 with our defines,
574 * except 0 is equivalent to low per datasheet */
576 tmp = DRIVE_STRENGTH_BIT_MSK(LOW);
581 static unsigned at91_mux_sam9x5_get_drivestrength(void __iomem *pio,
584 unsigned tmp = read_drive_strength(pio +
585 at91sam9x5_get_drive_register(pin), pin);
587 /* strength is inverse in SAM9x5s hardware with the pinctrl defines
588 * hardware: 0 = hi, 1 = med, 2 = low, 3 = rsvd */
589 tmp = DRIVE_STRENGTH_BIT_MSK(HI) - tmp;
594 static unsigned at91_mux_sam9x60_get_drivestrength(void __iomem *pio,
597 unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_DRIVER1);
600 return DRIVE_STRENGTH_BIT_HI;
602 return DRIVE_STRENGTH_BIT_LOW;
605 static unsigned at91_mux_sam9x60_get_slewrate(void __iomem *pio, unsigned pin)
607 unsigned tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR);
609 if ((tmp & BIT(pin)))
610 return SLEWRATE_BIT_ENA;
612 return SLEWRATE_BIT_DIS;
615 static void set_drive_strength(void __iomem *reg, unsigned pin, u32 strength)
617 unsigned tmp = readl_relaxed(reg);
618 unsigned shift = two_bit_pin_value_shift_amount(pin);
620 tmp &= ~(DRIVE_STRENGTH_MASK << shift);
621 tmp |= strength << shift;
623 writel_relaxed(tmp, reg);
626 static void at91_mux_sama5d3_set_drivestrength(void __iomem *pio, unsigned pin,
629 /* do nothing if setting is zero */
633 /* strength is 1 to 1 with setting for SAMA5 */
634 set_drive_strength(pio + sama5d3_get_drive_register(pin), pin, setting);
637 static void at91_mux_sam9x5_set_drivestrength(void __iomem *pio, unsigned pin,
640 /* do nothing if setting is zero */
644 /* strength is inverse on SAM9x5s with our defines
645 * 0 = hi, 1 = med, 2 = low, 3 = rsvd */
646 setting = DRIVE_STRENGTH_BIT_MSK(HI) - setting;
648 set_drive_strength(pio + at91sam9x5_get_drive_register(pin), pin,
652 static void at91_mux_sam9x60_set_drivestrength(void __iomem *pio, unsigned pin,
657 if (setting <= DRIVE_STRENGTH_BIT_DEF ||
658 setting == DRIVE_STRENGTH_BIT_MED ||
659 setting > DRIVE_STRENGTH_BIT_HI)
662 tmp = readl_relaxed(pio + SAM9X60_PIO_DRIVER1);
664 /* Strength is 0: low, 1: hi */
665 if (setting == DRIVE_STRENGTH_BIT_LOW)
670 writel_relaxed(tmp, pio + SAM9X60_PIO_DRIVER1);
673 static void at91_mux_sam9x60_set_slewrate(void __iomem *pio, unsigned pin,
678 if (setting < SLEWRATE_BIT_ENA || setting > SLEWRATE_BIT_DIS)
681 tmp = readl_relaxed(pio + SAM9X60_PIO_SLEWR);
683 if (setting == SLEWRATE_BIT_DIS)
688 writel_relaxed(tmp, pio + SAM9X60_PIO_SLEWR);
691 static const struct at91_pinctrl_mux_ops at91rm9200_ops = {
692 .get_periph = at91_mux_get_periph,
693 .mux_A_periph = at91_mux_set_A_periph,
694 .mux_B_periph = at91_mux_set_B_periph,
695 .get_deglitch = at91_mux_get_deglitch,
696 .set_deglitch = at91_mux_set_deglitch,
697 .irq_type = gpio_irq_type,
700 static const struct at91_pinctrl_mux_ops at91sam9x5_ops = {
701 .get_periph = at91_mux_pio3_get_periph,
702 .mux_A_periph = at91_mux_pio3_set_A_periph,
703 .mux_B_periph = at91_mux_pio3_set_B_periph,
704 .mux_C_periph = at91_mux_pio3_set_C_periph,
705 .mux_D_periph = at91_mux_pio3_set_D_periph,
706 .get_deglitch = at91_mux_pio3_get_deglitch,
707 .set_deglitch = at91_mux_pio3_set_deglitch,
708 .get_debounce = at91_mux_pio3_get_debounce,
709 .set_debounce = at91_mux_pio3_set_debounce,
710 .get_pulldown = at91_mux_pio3_get_pulldown,
711 .set_pulldown = at91_mux_pio3_set_pulldown,
712 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
713 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
714 .get_drivestrength = at91_mux_sam9x5_get_drivestrength,
715 .set_drivestrength = at91_mux_sam9x5_set_drivestrength,
716 .irq_type = alt_gpio_irq_type,
719 static const struct at91_pinctrl_mux_ops sam9x60_ops = {
720 .get_periph = at91_mux_pio3_get_periph,
721 .mux_A_periph = at91_mux_pio3_set_A_periph,
722 .mux_B_periph = at91_mux_pio3_set_B_periph,
723 .mux_C_periph = at91_mux_pio3_set_C_periph,
724 .mux_D_periph = at91_mux_pio3_set_D_periph,
725 .get_deglitch = at91_mux_pio3_get_deglitch,
726 .set_deglitch = at91_mux_pio3_set_deglitch,
727 .get_debounce = at91_mux_pio3_get_debounce,
728 .set_debounce = at91_mux_pio3_set_debounce,
729 .get_pulldown = at91_mux_pio3_get_pulldown,
730 .set_pulldown = at91_mux_pio3_set_pulldown,
731 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
732 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
733 .get_drivestrength = at91_mux_sam9x60_get_drivestrength,
734 .set_drivestrength = at91_mux_sam9x60_set_drivestrength,
735 .get_slewrate = at91_mux_sam9x60_get_slewrate,
736 .set_slewrate = at91_mux_sam9x60_set_slewrate,
737 .irq_type = alt_gpio_irq_type,
740 static const struct at91_pinctrl_mux_ops sama5d3_ops = {
741 .get_periph = at91_mux_pio3_get_periph,
742 .mux_A_periph = at91_mux_pio3_set_A_periph,
743 .mux_B_periph = at91_mux_pio3_set_B_periph,
744 .mux_C_periph = at91_mux_pio3_set_C_periph,
745 .mux_D_periph = at91_mux_pio3_set_D_periph,
746 .get_deglitch = at91_mux_pio3_get_deglitch,
747 .set_deglitch = at91_mux_pio3_set_deglitch,
748 .get_debounce = at91_mux_pio3_get_debounce,
749 .set_debounce = at91_mux_pio3_set_debounce,
750 .get_pulldown = at91_mux_pio3_get_pulldown,
751 .set_pulldown = at91_mux_pio3_set_pulldown,
752 .get_schmitt_trig = at91_mux_pio3_get_schmitt_trig,
753 .disable_schmitt_trig = at91_mux_pio3_disable_schmitt_trig,
754 .get_drivestrength = at91_mux_sama5d3_get_drivestrength,
755 .set_drivestrength = at91_mux_sama5d3_set_drivestrength,
756 .irq_type = alt_gpio_irq_type,
759 static void at91_pin_dbg(const struct device *dev, const struct at91_pmx_pin *pin)
762 dev_dbg(dev, "pio%c%d configured as periph%c with conf = 0x%lx\n",
763 pin->bank + 'A', pin->pin, pin->mux - 1 + 'A', pin->conf);
765 dev_dbg(dev, "pio%c%d configured as gpio with conf = 0x%lx\n",
766 pin->bank + 'A', pin->pin, pin->conf);
770 static int pin_check_config(struct at91_pinctrl *info, const char *name,
771 int index, const struct at91_pmx_pin *pin)
775 /* check if it's a valid config */
776 if (pin->bank >= gpio_banks) {
777 dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
778 name, index, pin->bank, gpio_banks);
782 if (!gpio_chips[pin->bank]) {
783 dev_err(info->dev, "%s: pin conf %d bank_id %d not enabled\n",
784 name, index, pin->bank);
788 if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
789 dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
790 name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
799 if (mux >= info->nmux) {
800 dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
801 name, index, mux, info->nmux);
805 if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
806 dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for pio%c%d\n",
807 name, index, mux, pin->bank + 'A', pin->pin);
814 static void at91_mux_gpio_disable(void __iomem *pio, unsigned mask)
816 writel_relaxed(mask, pio + PIO_PDR);
819 static void at91_mux_gpio_enable(void __iomem *pio, unsigned mask, bool input)
821 writel_relaxed(mask, pio + PIO_PER);
822 writel_relaxed(mask, pio + (input ? PIO_ODR : PIO_OER));
825 static int at91_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
828 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
829 const struct at91_pmx_pin *pins_conf = info->groups[group].pins_conf;
830 const struct at91_pmx_pin *pin;
831 uint32_t npins = info->groups[group].npins;
836 dev_dbg(info->dev, "enable function %s group %s\n",
837 info->functions[selector].name, info->groups[group].name);
839 /* first check that all the pins of the group are valid with a valid
841 for (i = 0; i < npins; i++) {
843 ret = pin_check_config(info, info->groups[group].name, i, pin);
848 for (i = 0; i < npins; i++) {
850 at91_pin_dbg(info->dev, pin);
851 pio = pin_to_controller(info, pin->bank);
856 mask = pin_to_mask(pin->pin);
857 at91_mux_disable_interrupt(pio, mask);
860 at91_mux_gpio_enable(pio, mask, 1);
862 case AT91_MUX_PERIPH_A:
863 info->ops->mux_A_periph(pio, mask);
865 case AT91_MUX_PERIPH_B:
866 info->ops->mux_B_periph(pio, mask);
868 case AT91_MUX_PERIPH_C:
869 if (!info->ops->mux_C_periph)
871 info->ops->mux_C_periph(pio, mask);
873 case AT91_MUX_PERIPH_D:
874 if (!info->ops->mux_D_periph)
876 info->ops->mux_D_periph(pio, mask);
880 at91_mux_gpio_disable(pio, mask);
886 static int at91_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
888 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
890 return info->nfunctions;
893 static const char *at91_pmx_get_func_name(struct pinctrl_dev *pctldev,
896 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
898 return info->functions[selector].name;
901 static int at91_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
902 const char * const **groups,
903 unsigned * const num_groups)
905 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
907 *groups = info->functions[selector].groups;
908 *num_groups = info->functions[selector].ngroups;
913 static int at91_gpio_request_enable(struct pinctrl_dev *pctldev,
914 struct pinctrl_gpio_range *range,
917 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
918 struct at91_gpio_chip *at91_chip;
919 struct gpio_chip *chip;
923 dev_err(npct->dev, "invalid range\n");
927 dev_err(npct->dev, "missing GPIO chip in range\n");
931 at91_chip = gpiochip_get_data(chip);
933 dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
935 mask = 1 << (offset - chip->base);
937 dev_dbg(npct->dev, "enable pin %u as PIO%c%d 0x%x\n",
938 offset, 'A' + range->id, offset - chip->base, mask);
940 writel_relaxed(mask, at91_chip->regbase + PIO_PER);
945 static void at91_gpio_disable_free(struct pinctrl_dev *pctldev,
946 struct pinctrl_gpio_range *range,
949 struct at91_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
951 dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
952 /* Set the pin to some default state, GPIO is usually default */
955 static const struct pinmux_ops at91_pmx_ops = {
956 .get_functions_count = at91_pmx_get_funcs_count,
957 .get_function_name = at91_pmx_get_func_name,
958 .get_function_groups = at91_pmx_get_groups,
959 .set_mux = at91_pmx_set,
960 .gpio_request_enable = at91_gpio_request_enable,
961 .gpio_disable_free = at91_gpio_disable_free,
964 static int at91_pinconf_get(struct pinctrl_dev *pctldev,
965 unsigned pin_id, unsigned long *config)
967 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
974 dev_dbg(info->dev, "%s:%d, pin_id=%d", __func__, __LINE__, pin_id);
975 pio = pin_to_controller(info, pin_to_bank(pin_id));
980 pin = pin_id % MAX_NB_GPIO_PER_BANK;
982 if (at91_mux_get_multidrive(pio, pin))
983 *config |= MULTI_DRIVE;
985 if (at91_mux_get_pullup(pio, pin))
988 if (info->ops->get_deglitch && info->ops->get_deglitch(pio, pin))
990 if (info->ops->get_debounce && info->ops->get_debounce(pio, pin, &div))
991 *config |= DEBOUNCE | (div << DEBOUNCE_VAL_SHIFT);
992 if (info->ops->get_pulldown && info->ops->get_pulldown(pio, pin))
993 *config |= PULL_DOWN;
994 if (info->ops->get_schmitt_trig && info->ops->get_schmitt_trig(pio, pin))
995 *config |= DIS_SCHMIT;
996 if (info->ops->get_drivestrength)
997 *config |= (info->ops->get_drivestrength(pio, pin)
998 << DRIVE_STRENGTH_SHIFT);
999 if (info->ops->get_slewrate)
1000 *config |= (info->ops->get_slewrate(pio, pin) << SLEWRATE_SHIFT);
1001 if (at91_mux_get_output(pio, pin, &out))
1002 *config |= OUTPUT | (out << OUTPUT_VAL_SHIFT);
1007 static int at91_pinconf_set(struct pinctrl_dev *pctldev,
1008 unsigned pin_id, unsigned long *configs,
1009 unsigned num_configs)
1011 struct at91_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
1015 unsigned long config;
1018 for (i = 0; i < num_configs; i++) {
1019 config = configs[i];
1022 "%s:%d, pin_id=%d, config=0x%lx",
1023 __func__, __LINE__, pin_id, config);
1024 pio = pin_to_controller(info, pin_to_bank(pin_id));
1029 pin = pin_id % MAX_NB_GPIO_PER_BANK;
1030 mask = pin_to_mask(pin);
1032 if (config & PULL_UP && config & PULL_DOWN)
1035 at91_mux_set_output(pio, mask, config & OUTPUT,
1036 (config & OUTPUT_VAL) >> OUTPUT_VAL_SHIFT);
1037 at91_mux_set_pullup(pio, mask, config & PULL_UP);
1038 at91_mux_set_multidrive(pio, mask, config & MULTI_DRIVE);
1039 if (info->ops->set_deglitch)
1040 info->ops->set_deglitch(pio, mask, config & DEGLITCH);
1041 if (info->ops->set_debounce)
1042 info->ops->set_debounce(pio, mask, config & DEBOUNCE,
1043 (config & DEBOUNCE_VAL) >> DEBOUNCE_VAL_SHIFT);
1044 if (info->ops->set_pulldown)
1045 info->ops->set_pulldown(pio, mask, config & PULL_DOWN);
1046 if (info->ops->disable_schmitt_trig && config & DIS_SCHMIT)
1047 info->ops->disable_schmitt_trig(pio, mask);
1048 if (info->ops->set_drivestrength)
1049 info->ops->set_drivestrength(pio, pin,
1050 (config & DRIVE_STRENGTH)
1051 >> DRIVE_STRENGTH_SHIFT);
1052 if (info->ops->set_slewrate)
1053 info->ops->set_slewrate(pio, pin,
1054 (config & SLEWRATE) >> SLEWRATE_SHIFT);
1056 } /* for each config */
1061 #define DBG_SHOW_FLAG(flag) do { \
1062 if (config & flag) { \
1065 seq_puts(s, #flag); \
1070 #define DBG_SHOW_FLAG_MASKED(mask, flag, name) do { \
1071 if ((config & mask) == flag) { \
1074 seq_puts(s, #name); \
1079 static void at91_pinconf_dbg_show(struct pinctrl_dev *pctldev,
1080 struct seq_file *s, unsigned pin_id)
1082 unsigned long config;
1083 int val, num_conf = 0;
1085 at91_pinconf_get(pctldev, pin_id, &config);
1087 DBG_SHOW_FLAG(MULTI_DRIVE);
1088 DBG_SHOW_FLAG(PULL_UP);
1089 DBG_SHOW_FLAG(PULL_DOWN);
1090 DBG_SHOW_FLAG(DIS_SCHMIT);
1091 DBG_SHOW_FLAG(DEGLITCH);
1092 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(LOW),
1093 DRIVE_STRENGTH_LOW);
1094 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(MED),
1095 DRIVE_STRENGTH_MED);
1096 DBG_SHOW_FLAG_MASKED(DRIVE_STRENGTH, DRIVE_STRENGTH_BIT_MSK(HI),
1098 DBG_SHOW_FLAG(SLEWRATE);
1099 DBG_SHOW_FLAG(DEBOUNCE);
1100 if (config & DEBOUNCE) {
1101 val = config >> DEBOUNCE_VAL_SHIFT;
1102 seq_printf(s, "(%d)", val);
1108 static void at91_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
1109 struct seq_file *s, unsigned group)
1113 static const struct pinconf_ops at91_pinconf_ops = {
1114 .pin_config_get = at91_pinconf_get,
1115 .pin_config_set = at91_pinconf_set,
1116 .pin_config_dbg_show = at91_pinconf_dbg_show,
1117 .pin_config_group_dbg_show = at91_pinconf_group_dbg_show,
1120 static struct pinctrl_desc at91_pinctrl_desc = {
1121 .pctlops = &at91_pctrl_ops,
1122 .pmxops = &at91_pmx_ops,
1123 .confops = &at91_pinconf_ops,
1124 .owner = THIS_MODULE,
1127 static const char *gpio_compat = "atmel,at91rm9200-gpio";
1129 static void at91_pinctrl_child_count(struct at91_pinctrl *info,
1130 struct device_node *np)
1132 struct device_node *child;
1134 for_each_child_of_node(np, child) {
1135 if (of_device_is_compatible(child, gpio_compat)) {
1136 if (of_device_is_available(child))
1137 info->nactive_banks++;
1140 info->ngroups += of_get_child_count(child);
1145 static int at91_pinctrl_mux_mask(struct at91_pinctrl *info,
1146 struct device_node *np)
1152 list = of_get_property(np, "atmel,mux-mask", &size);
1154 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
1158 size /= sizeof(*list);
1159 if (!size || size % gpio_banks) {
1160 dev_err(info->dev, "wrong mux mask array should be by %d\n", gpio_banks);
1163 info->nmux = size / gpio_banks;
1165 info->mux_mask = devm_kcalloc(info->dev, size, sizeof(u32),
1167 if (!info->mux_mask)
1170 ret = of_property_read_u32_array(np, "atmel,mux-mask",
1171 info->mux_mask, size);
1173 dev_err(info->dev, "can not read the mux-mask of %d\n", size);
1177 static int at91_pinctrl_parse_groups(struct device_node *np,
1178 struct at91_pin_group *grp,
1179 struct at91_pinctrl *info, u32 index)
1181 struct at91_pmx_pin *pin;
1186 dev_dbg(info->dev, "group(%d): %pOFn\n", index, np);
1188 /* Initialise group */
1189 grp->name = np->name;
1192 * the binding format is atmel,pins = <bank pin mux CONFIG ...>,
1193 * do sanity check and calculate pins number
1195 list = of_get_property(np, "atmel,pins", &size);
1196 /* we do not check return since it's safe node passed down */
1197 size /= sizeof(*list);
1198 if (!size || size % 4) {
1199 dev_err(info->dev, "wrong pins number or pins and configs should be by 4\n");
1203 grp->npins = size / 4;
1204 pin = grp->pins_conf = devm_kcalloc(info->dev,
1206 sizeof(struct at91_pmx_pin),
1208 grp->pins = devm_kcalloc(info->dev, grp->npins, sizeof(unsigned int),
1210 if (!grp->pins_conf || !grp->pins)
1213 for (i = 0, j = 0; i < size; i += 4, j++) {
1214 pin->bank = be32_to_cpu(*list++);
1215 pin->pin = be32_to_cpu(*list++);
1216 grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
1217 pin->mux = be32_to_cpu(*list++);
1218 pin->conf = be32_to_cpu(*list++);
1220 at91_pin_dbg(info->dev, pin);
1227 static int at91_pinctrl_parse_functions(struct device_node *np,
1228 struct at91_pinctrl *info, u32 index)
1230 struct device_node *child;
1231 struct at91_pmx_func *func;
1232 struct at91_pin_group *grp;
1234 static u32 grp_index;
1237 dev_dbg(info->dev, "parse function(%d): %pOFn\n", index, np);
1239 func = &info->functions[index];
1241 /* Initialise function */
1242 func->name = np->name;
1243 func->ngroups = of_get_child_count(np);
1244 if (func->ngroups == 0) {
1245 dev_err(info->dev, "no groups defined\n");
1248 func->groups = devm_kcalloc(info->dev,
1249 func->ngroups, sizeof(char *), GFP_KERNEL);
1253 for_each_child_of_node(np, child) {
1254 func->groups[i] = child->name;
1255 grp = &info->groups[grp_index++];
1256 ret = at91_pinctrl_parse_groups(child, grp, info, i++);
1266 static const struct of_device_id at91_pinctrl_of_match[] = {
1267 { .compatible = "atmel,sama5d3-pinctrl", .data = &sama5d3_ops },
1268 { .compatible = "atmel,at91sam9x5-pinctrl", .data = &at91sam9x5_ops },
1269 { .compatible = "atmel,at91rm9200-pinctrl", .data = &at91rm9200_ops },
1270 { .compatible = "microchip,sam9x60-pinctrl", .data = &sam9x60_ops },
1274 static int at91_pinctrl_probe_dt(struct platform_device *pdev,
1275 struct at91_pinctrl *info)
1280 struct device_node *np = pdev->dev.of_node;
1281 struct device_node *child;
1286 info->dev = &pdev->dev;
1287 info->ops = (const struct at91_pinctrl_mux_ops *)
1288 of_match_device(at91_pinctrl_of_match, &pdev->dev)->data;
1289 at91_pinctrl_child_count(info, np);
1291 if (gpio_banks < 1) {
1292 dev_err(&pdev->dev, "you need to specify at least one gpio-controller\n");
1296 ret = at91_pinctrl_mux_mask(info, np);
1300 dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
1302 dev_dbg(&pdev->dev, "mux-mask\n");
1303 tmp = info->mux_mask;
1304 for (i = 0; i < gpio_banks; i++) {
1305 for (j = 0; j < info->nmux; j++, tmp++) {
1306 dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
1310 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1311 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1312 info->functions = devm_kcalloc(&pdev->dev,
1314 sizeof(struct at91_pmx_func),
1316 if (!info->functions)
1319 info->groups = devm_kcalloc(&pdev->dev,
1321 sizeof(struct at91_pin_group),
1326 dev_dbg(&pdev->dev, "nbanks = %d\n", gpio_banks);
1327 dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
1328 dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
1332 for_each_child_of_node(np, child) {
1333 if (of_device_is_compatible(child, gpio_compat))
1335 ret = at91_pinctrl_parse_functions(child, info, i++);
1337 dev_err(&pdev->dev, "failed to parse function\n");
1346 static int at91_pinctrl_probe(struct platform_device *pdev)
1348 struct at91_pinctrl *info;
1349 struct pinctrl_pin_desc *pdesc;
1350 int ret, i, j, k, ngpio_chips_enabled = 0;
1352 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
1356 ret = at91_pinctrl_probe_dt(pdev, info);
1361 * We need all the GPIO drivers to probe FIRST, or we will not be able
1362 * to obtain references to the struct gpio_chip * for them, and we
1363 * need this to proceed.
1365 for (i = 0; i < gpio_banks; i++)
1367 ngpio_chips_enabled++;
1369 if (ngpio_chips_enabled < info->nactive_banks) {
1370 dev_warn(&pdev->dev,
1371 "All GPIO chips are not registered yet (%d/%d)\n",
1372 ngpio_chips_enabled, info->nactive_banks);
1373 devm_kfree(&pdev->dev, info);
1374 return -EPROBE_DEFER;
1377 at91_pinctrl_desc.name = dev_name(&pdev->dev);
1378 at91_pinctrl_desc.npins = gpio_banks * MAX_NB_GPIO_PER_BANK;
1379 at91_pinctrl_desc.pins = pdesc =
1380 devm_kcalloc(&pdev->dev,
1381 at91_pinctrl_desc.npins, sizeof(*pdesc),
1384 if (!at91_pinctrl_desc.pins)
1387 for (i = 0, k = 0; i < gpio_banks; i++) {
1388 for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
1390 pdesc->name = kasprintf(GFP_KERNEL, "pio%c%d", i + 'A', j);
1395 platform_set_drvdata(pdev, info);
1396 info->pctl = devm_pinctrl_register(&pdev->dev, &at91_pinctrl_desc,
1399 if (IS_ERR(info->pctl)) {
1400 dev_err(&pdev->dev, "could not register AT91 pinctrl driver\n");
1401 return PTR_ERR(info->pctl);
1404 /* We will handle a range of GPIO pins */
1405 for (i = 0; i < gpio_banks; i++)
1407 pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
1409 dev_info(&pdev->dev, "initialized AT91 pinctrl driver\n");
1414 static int at91_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
1416 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1417 void __iomem *pio = at91_gpio->regbase;
1418 unsigned mask = 1 << offset;
1421 osr = readl_relaxed(pio + PIO_OSR);
1423 return GPIO_LINE_DIRECTION_OUT;
1425 return GPIO_LINE_DIRECTION_IN;
1428 static int at91_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1430 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1431 void __iomem *pio = at91_gpio->regbase;
1432 unsigned mask = 1 << offset;
1434 writel_relaxed(mask, pio + PIO_ODR);
1438 static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
1440 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1441 void __iomem *pio = at91_gpio->regbase;
1442 unsigned mask = 1 << offset;
1445 pdsr = readl_relaxed(pio + PIO_PDSR);
1446 return (pdsr & mask) != 0;
1449 static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
1452 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1453 void __iomem *pio = at91_gpio->regbase;
1454 unsigned mask = 1 << offset;
1456 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1459 static void at91_gpio_set_multiple(struct gpio_chip *chip,
1460 unsigned long *mask, unsigned long *bits)
1462 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1463 void __iomem *pio = at91_gpio->regbase;
1465 #define BITS_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
1466 /* Mask additionally to ngpio as not all GPIO controllers have 32 pins */
1467 uint32_t set_mask = (*mask & *bits) & BITS_MASK(chip->ngpio);
1468 uint32_t clear_mask = (*mask & ~(*bits)) & BITS_MASK(chip->ngpio);
1470 writel_relaxed(set_mask, pio + PIO_SODR);
1471 writel_relaxed(clear_mask, pio + PIO_CODR);
1474 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
1477 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1478 void __iomem *pio = at91_gpio->regbase;
1479 unsigned mask = 1 << offset;
1481 writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
1482 writel_relaxed(mask, pio + PIO_OER);
1487 #ifdef CONFIG_DEBUG_FS
1488 static void at91_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
1492 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
1493 void __iomem *pio = at91_gpio->regbase;
1494 const char *gpio_label;
1496 for_each_requested_gpio(chip, i, gpio_label) {
1497 unsigned mask = pin_to_mask(i);
1499 mode = at91_gpio->ops->get_periph(pio, mask);
1500 seq_printf(s, "[%s] GPIO%s%d: ",
1501 gpio_label, chip->label, i);
1502 if (mode == AT91_MUX_GPIO) {
1503 seq_printf(s, "[gpio] ");
1504 seq_printf(s, "%s ",
1505 readl_relaxed(pio + PIO_OSR) & mask ?
1506 "output" : "input");
1507 seq_printf(s, "%s\n",
1508 readl_relaxed(pio + PIO_PDSR) & mask ?
1511 seq_printf(s, "[periph %c]\n",
1517 #define at91_gpio_dbg_show NULL
1520 /* Several AIC controller irqs are dispatched through this GPIO handler.
1521 * To use any AT91_PIN_* as an externally triggered IRQ, first call
1522 * at91_set_gpio_input() then maybe enable its glitch filter.
1523 * Then just request_irq() with the pin ID; it works like any ARM IRQ
1525 * First implementation always triggers on rising and falling edges
1526 * whereas the newer PIO3 can be additionally configured to trigger on
1527 * level, edge with any polarity.
1529 * Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
1530 * configuring them with at91_set_a_periph() or at91_set_b_periph().
1531 * IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
1534 static void gpio_irq_mask(struct irq_data *d)
1536 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1537 void __iomem *pio = at91_gpio->regbase;
1538 unsigned mask = 1 << d->hwirq;
1541 writel_relaxed(mask, pio + PIO_IDR);
1544 static void gpio_irq_unmask(struct irq_data *d)
1546 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1547 void __iomem *pio = at91_gpio->regbase;
1548 unsigned mask = 1 << d->hwirq;
1551 writel_relaxed(mask, pio + PIO_IER);
1554 static int gpio_irq_type(struct irq_data *d, unsigned type)
1558 case IRQ_TYPE_EDGE_BOTH:
1565 /* Alternate irq type for PIO3 support */
1566 static int alt_gpio_irq_type(struct irq_data *d, unsigned type)
1568 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1569 void __iomem *pio = at91_gpio->regbase;
1570 unsigned mask = 1 << d->hwirq;
1573 case IRQ_TYPE_EDGE_RISING:
1574 irq_set_handler_locked(d, handle_simple_irq);
1575 writel_relaxed(mask, pio + PIO_ESR);
1576 writel_relaxed(mask, pio + PIO_REHLSR);
1578 case IRQ_TYPE_EDGE_FALLING:
1579 irq_set_handler_locked(d, handle_simple_irq);
1580 writel_relaxed(mask, pio + PIO_ESR);
1581 writel_relaxed(mask, pio + PIO_FELLSR);
1583 case IRQ_TYPE_LEVEL_LOW:
1584 irq_set_handler_locked(d, handle_level_irq);
1585 writel_relaxed(mask, pio + PIO_LSR);
1586 writel_relaxed(mask, pio + PIO_FELLSR);
1588 case IRQ_TYPE_LEVEL_HIGH:
1589 irq_set_handler_locked(d, handle_level_irq);
1590 writel_relaxed(mask, pio + PIO_LSR);
1591 writel_relaxed(mask, pio + PIO_REHLSR);
1593 case IRQ_TYPE_EDGE_BOTH:
1595 * disable additional interrupt modes:
1596 * fall back to default behavior
1598 irq_set_handler_locked(d, handle_simple_irq);
1599 writel_relaxed(mask, pio + PIO_AIMDR);
1603 pr_warn("AT91: No type for GPIO irq offset %d\n", d->irq);
1607 /* enable additional interrupt modes */
1608 writel_relaxed(mask, pio + PIO_AIMER);
1613 static void gpio_irq_ack(struct irq_data *d)
1615 /* the interrupt is already cleared before by reading ISR */
1620 static u32 wakeups[MAX_GPIO_BANKS];
1621 static u32 backups[MAX_GPIO_BANKS];
1623 static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
1625 struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d);
1626 unsigned bank = at91_gpio->pioc_idx;
1627 unsigned mask = 1 << d->hwirq;
1629 if (unlikely(bank >= MAX_GPIO_BANKS))
1633 wakeups[bank] |= mask;
1635 wakeups[bank] &= ~mask;
1637 irq_set_irq_wake(at91_gpio->pioc_virq, state);
1642 void at91_pinctrl_gpio_suspend(void)
1646 for (i = 0; i < gpio_banks; i++) {
1652 pio = gpio_chips[i]->regbase;
1654 backups[i] = readl_relaxed(pio + PIO_IMR);
1655 writel_relaxed(backups[i], pio + PIO_IDR);
1656 writel_relaxed(wakeups[i], pio + PIO_IER);
1659 clk_disable_unprepare(gpio_chips[i]->clock);
1661 printk(KERN_DEBUG "GPIO-%c may wake for %08x\n",
1666 void at91_pinctrl_gpio_resume(void)
1670 for (i = 0; i < gpio_banks; i++) {
1676 pio = gpio_chips[i]->regbase;
1679 clk_prepare_enable(gpio_chips[i]->clock);
1681 writel_relaxed(wakeups[i], pio + PIO_IDR);
1682 writel_relaxed(backups[i], pio + PIO_IER);
1687 #define gpio_irq_set_wake NULL
1688 #endif /* CONFIG_PM */
1690 static void gpio_irq_handler(struct irq_desc *desc)
1692 struct irq_chip *chip = irq_desc_get_chip(desc);
1693 struct gpio_chip *gpio_chip = irq_desc_get_handler_data(desc);
1694 struct at91_gpio_chip *at91_gpio = gpiochip_get_data(gpio_chip);
1695 void __iomem *pio = at91_gpio->regbase;
1699 chained_irq_enter(chip, desc);
1701 /* Reading ISR acks pending (edge triggered) GPIO interrupts.
1702 * When there are none pending, we're finished unless we need
1703 * to process multiple banks (like ID_PIOCDE on sam9263).
1705 isr = readl_relaxed(pio + PIO_ISR) & readl_relaxed(pio + PIO_IMR);
1707 if (!at91_gpio->next)
1709 at91_gpio = at91_gpio->next;
1710 pio = at91_gpio->regbase;
1711 gpio_chip = &at91_gpio->chip;
1715 for_each_set_bit(n, &isr, BITS_PER_LONG)
1716 generic_handle_domain_irq(gpio_chip->irq.domain, n);
1718 chained_irq_exit(chip, desc);
1719 /* now it may re-trigger */
1722 static int at91_gpio_of_irq_setup(struct platform_device *pdev,
1723 struct at91_gpio_chip *at91_gpio)
1725 struct gpio_chip *gpiochip_prev = NULL;
1726 struct at91_gpio_chip *prev = NULL;
1727 struct irq_data *d = irq_get_irq_data(at91_gpio->pioc_virq);
1728 struct irq_chip *gpio_irqchip;
1729 struct gpio_irq_chip *girq;
1732 gpio_irqchip = devm_kzalloc(&pdev->dev, sizeof(*gpio_irqchip),
1737 at91_gpio->pioc_hwirq = irqd_to_hwirq(d);
1739 gpio_irqchip->name = "GPIO";
1740 gpio_irqchip->irq_ack = gpio_irq_ack;
1741 gpio_irqchip->irq_disable = gpio_irq_mask;
1742 gpio_irqchip->irq_mask = gpio_irq_mask;
1743 gpio_irqchip->irq_unmask = gpio_irq_unmask;
1744 gpio_irqchip->irq_set_wake = gpio_irq_set_wake;
1745 gpio_irqchip->irq_set_type = at91_gpio->ops->irq_type;
1747 /* Disable irqs of this PIO controller */
1748 writel_relaxed(~0, at91_gpio->regbase + PIO_IDR);
1751 * Let the generic code handle this edge IRQ, the the chained
1752 * handler will perform the actual work of handling the parent
1755 girq = &at91_gpio->chip.irq;
1756 girq->chip = gpio_irqchip;
1757 girq->default_type = IRQ_TYPE_NONE;
1758 girq->handler = handle_edge_irq;
1761 * The top level handler handles one bank of GPIOs, except
1762 * on some SoC it can handle up to three...
1763 * We only set up the handler for the first of the list.
1765 gpiochip_prev = irq_get_handler_data(at91_gpio->pioc_virq);
1766 if (!gpiochip_prev) {
1767 girq->parent_handler = gpio_irq_handler;
1768 girq->num_parents = 1;
1769 girq->parents = devm_kcalloc(&pdev->dev, 1,
1770 sizeof(*girq->parents),
1774 girq->parents[0] = at91_gpio->pioc_virq;
1778 prev = gpiochip_get_data(gpiochip_prev);
1779 /* we can only have 2 banks before */
1780 for (i = 0; i < 2; i++) {
1784 prev->next = at91_gpio;
1792 /* This structure is replicated for each GPIO block allocated at probe time */
1793 static const struct gpio_chip at91_gpio_template = {
1794 .request = gpiochip_generic_request,
1795 .free = gpiochip_generic_free,
1796 .get_direction = at91_gpio_get_direction,
1797 .direction_input = at91_gpio_direction_input,
1798 .get = at91_gpio_get,
1799 .direction_output = at91_gpio_direction_output,
1800 .set = at91_gpio_set,
1801 .set_multiple = at91_gpio_set_multiple,
1802 .dbg_show = at91_gpio_dbg_show,
1804 .ngpio = MAX_NB_GPIO_PER_BANK,
1807 static const struct of_device_id at91_gpio_of_match[] = {
1808 { .compatible = "atmel,at91sam9x5-gpio", .data = &at91sam9x5_ops, },
1809 { .compatible = "atmel,at91rm9200-gpio", .data = &at91rm9200_ops },
1810 { .compatible = "microchip,sam9x60-gpio", .data = &sam9x60_ops },
1814 static int at91_gpio_probe(struct platform_device *pdev)
1816 struct device_node *np = pdev->dev.of_node;
1817 struct at91_gpio_chip *at91_chip = NULL;
1818 struct gpio_chip *chip;
1819 struct pinctrl_gpio_range *range;
1822 int alias_idx = of_alias_get_id(np, "gpio");
1826 BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips));
1827 if (gpio_chips[alias_idx]) {
1832 irq = platform_get_irq(pdev, 0);
1838 at91_chip = devm_kzalloc(&pdev->dev, sizeof(*at91_chip), GFP_KERNEL);
1844 at91_chip->regbase = devm_platform_ioremap_resource(pdev, 0);
1845 if (IS_ERR(at91_chip->regbase)) {
1846 ret = PTR_ERR(at91_chip->regbase);
1850 at91_chip->ops = (const struct at91_pinctrl_mux_ops *)
1851 of_match_device(at91_gpio_of_match, &pdev->dev)->data;
1852 at91_chip->pioc_virq = irq;
1853 at91_chip->pioc_idx = alias_idx;
1855 at91_chip->clock = devm_clk_get(&pdev->dev, NULL);
1856 if (IS_ERR(at91_chip->clock)) {
1857 dev_err(&pdev->dev, "failed to get clock, ignoring.\n");
1858 ret = PTR_ERR(at91_chip->clock);
1862 ret = clk_prepare_enable(at91_chip->clock);
1864 dev_err(&pdev->dev, "failed to prepare and enable clock, ignoring.\n");
1865 goto clk_enable_err;
1868 at91_chip->chip = at91_gpio_template;
1870 chip = &at91_chip->chip;
1872 chip->label = dev_name(&pdev->dev);
1873 chip->parent = &pdev->dev;
1874 chip->owner = THIS_MODULE;
1875 chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
1877 if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
1878 if (ngpio >= MAX_NB_GPIO_PER_BANK)
1879 pr_err("at91_gpio.%d, gpio-nb >= %d failback to %d\n",
1880 alias_idx, MAX_NB_GPIO_PER_BANK, MAX_NB_GPIO_PER_BANK);
1882 chip->ngpio = ngpio;
1885 names = devm_kcalloc(&pdev->dev, chip->ngpio, sizeof(char *),
1890 goto clk_enable_err;
1893 for (i = 0; i < chip->ngpio; i++)
1894 names[i] = kasprintf(GFP_KERNEL, "pio%c%d", alias_idx + 'A', i);
1896 chip->names = (const char *const *)names;
1898 range = &at91_chip->range;
1899 range->name = chip->label;
1900 range->id = alias_idx;
1901 range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
1903 range->npins = chip->ngpio;
1906 ret = at91_gpio_of_irq_setup(pdev, at91_chip);
1908 goto gpiochip_add_err;
1910 ret = gpiochip_add_data(chip, at91_chip);
1912 goto gpiochip_add_err;
1914 gpio_chips[alias_idx] = at91_chip;
1915 gpio_banks = max(gpio_banks, alias_idx + 1);
1917 dev_info(&pdev->dev, "at address %p\n", at91_chip->regbase);
1923 clk_disable_unprepare(at91_chip->clock);
1925 dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
1930 static struct platform_driver at91_gpio_driver = {
1932 .name = "gpio-at91",
1933 .of_match_table = at91_gpio_of_match,
1935 .probe = at91_gpio_probe,
1938 static struct platform_driver at91_pinctrl_driver = {
1940 .name = "pinctrl-at91",
1941 .of_match_table = at91_pinctrl_of_match,
1943 .probe = at91_pinctrl_probe,
1946 static struct platform_driver * const drivers[] = {
1948 &at91_pinctrl_driver,
1951 static int __init at91_pinctrl_init(void)
1953 return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
1955 arch_initcall(at91_pinctrl_init);