6 * Copyright (C) 2005 HP Labs
8 * SPDX-License-Identifier: GPL-2.0+
15 #include <linux/sizes.h>
17 #include <asm/arch/hardware.h>
18 #include <asm/arch/at91_pio.h>
20 #define GPIO_PER_BANK 32
22 static struct at91_port *at91_pio_get_port(unsigned port)
26 return (struct at91_port *)ATMEL_BASE_PIOA;
28 return (struct at91_port *)ATMEL_BASE_PIOB;
30 return (struct at91_port *)ATMEL_BASE_PIOC;
31 #if (ATMEL_PIO_PORTS > 3)
33 return (struct at91_port *)ATMEL_BASE_PIOD;
34 #if (ATMEL_PIO_PORTS > 4)
36 return (struct at91_port *)ATMEL_BASE_PIOE;
40 printf("Error: at91_gpio: Fail to get PIO base!\n");
45 static void at91_set_port_pullup(struct at91_port *at91_port, unsigned offset,
52 writel(mask, &at91_port->puer);
54 writel(mask, &at91_port->pudr);
55 writel(mask, &at91_port->per);
58 int at91_set_pio_pullup(unsigned port, unsigned pin, int use_pullup)
60 struct at91_port *at91_port = at91_pio_get_port(port);
62 if (at91_port && (pin < GPIO_PER_BANK))
63 at91_set_port_pullup(at91_port, pin, use_pullup);
69 * mux the pin to the "GPIO" peripheral role.
71 int at91_set_pio_periph(unsigned port, unsigned pin, int use_pullup)
73 struct at91_port *at91_port = at91_pio_get_port(port);
76 if (at91_port && (pin < GPIO_PER_BANK)) {
78 writel(mask, &at91_port->idr);
79 at91_set_pio_pullup(port, pin, use_pullup);
80 writel(mask, &at91_port->per);
87 * mux the pin to the "A" internal peripheral role.
89 int at91_set_a_periph(unsigned port, unsigned pin, int use_pullup)
91 struct at91_port *at91_port = at91_pio_get_port(port);
94 if (at91_port && (pin < GPIO_PER_BANK)) {
96 writel(mask, &at91_port->idr);
97 at91_set_pio_pullup(port, pin, use_pullup);
98 #if defined(CPU_HAS_PIO3)
99 writel(readl(&at91_port->abcdsr1) & ~mask,
100 &at91_port->abcdsr1);
101 writel(readl(&at91_port->abcdsr2) & ~mask,
102 &at91_port->abcdsr2);
104 writel(mask, &at91_port->asr);
106 writel(mask, &at91_port->pdr);
113 * mux the pin to the "B" internal peripheral role.
115 int at91_set_b_periph(unsigned port, unsigned pin, int use_pullup)
117 struct at91_port *at91_port = at91_pio_get_port(port);
120 if (at91_port && (pin < GPIO_PER_BANK)) {
122 writel(mask, &at91_port->idr);
123 at91_set_pio_pullup(port, pin, use_pullup);
124 #if defined(CPU_HAS_PIO3)
125 writel(readl(&at91_port->abcdsr1) | mask,
126 &at91_port->abcdsr1);
127 writel(readl(&at91_port->abcdsr2) & ~mask,
128 &at91_port->abcdsr2);
130 writel(mask, &at91_port->bsr);
132 writel(mask, &at91_port->pdr);
138 #if defined(CPU_HAS_PIO3)
140 * mux the pin to the "C" internal peripheral role.
142 int at91_set_c_periph(unsigned port, unsigned pin, int use_pullup)
144 struct at91_port *at91_port = at91_pio_get_port(port);
147 if (at91_port && (pin < GPIO_PER_BANK)) {
149 writel(mask, &at91_port->idr);
150 at91_set_pio_pullup(port, pin, use_pullup);
151 writel(readl(&at91_port->abcdsr1) & ~mask,
152 &at91_port->abcdsr1);
153 writel(readl(&at91_port->abcdsr2) | mask,
154 &at91_port->abcdsr2);
155 writel(mask, &at91_port->pdr);
162 * mux the pin to the "D" internal peripheral role.
164 int at91_set_d_periph(unsigned port, unsigned pin, int use_pullup)
166 struct at91_port *at91_port = at91_pio_get_port(port);
169 if (at91_port && (pin < GPIO_PER_BANK)) {
171 writel(mask, &at91_port->idr);
172 at91_set_pio_pullup(port, pin, use_pullup);
173 writel(readl(&at91_port->abcdsr1) | mask,
174 &at91_port->abcdsr1);
175 writel(readl(&at91_port->abcdsr2) | mask,
176 &at91_port->abcdsr2);
177 writel(mask, &at91_port->pdr);
184 #ifdef CONFIG_DM_GPIO
185 static bool at91_get_port_output(struct at91_port *at91_port, int offset)
190 val = readl(&at91_port->osr);
195 static void at91_set_port_input(struct at91_port *at91_port, int offset,
201 writel(mask, &at91_port->idr);
202 at91_set_port_pullup(at91_port, offset, use_pullup);
203 writel(mask, &at91_port->odr);
204 writel(mask, &at91_port->per);
208 * mux the pin to the gpio controller (instead of "A" or "B" peripheral), and
209 * configure it for an input.
211 int at91_set_pio_input(unsigned port, u32 pin, int use_pullup)
213 struct at91_port *at91_port = at91_pio_get_port(port);
215 if (at91_port && (pin < GPIO_PER_BANK))
216 at91_set_port_input(at91_port, pin, use_pullup);
221 static void at91_set_port_output(struct at91_port *at91_port, int offset,
227 writel(mask, &at91_port->idr);
228 writel(mask, &at91_port->pudr);
230 writel(mask, &at91_port->sodr);
232 writel(mask, &at91_port->codr);
233 writel(mask, &at91_port->oer);
234 writel(mask, &at91_port->per);
238 * mux the pin to the gpio controller (instead of "A" or "B" peripheral),
239 * and configure it for an output.
241 int at91_set_pio_output(unsigned port, u32 pin, int value)
243 struct at91_port *at91_port = at91_pio_get_port(port);
245 if (at91_port && (pin < GPIO_PER_BANK))
246 at91_set_port_output(at91_port, pin, value);
252 * enable/disable the glitch filter. mostly used with IRQ handling.
254 int at91_set_pio_deglitch(unsigned port, unsigned pin, int is_on)
256 struct at91_port *at91_port = at91_pio_get_port(port);
259 if (at91_port && (pin < GPIO_PER_BANK)) {
262 #if defined(CPU_HAS_PIO3)
263 writel(mask, &at91_port->ifscdr);
265 writel(mask, &at91_port->ifer);
267 writel(mask, &at91_port->ifdr);
274 #if defined(CPU_HAS_PIO3)
276 * enable/disable the debounce filter.
278 int at91_set_pio_debounce(unsigned port, unsigned pin, int is_on, int div)
280 struct at91_port *at91_port = at91_pio_get_port(port);
283 if (at91_port && (pin < GPIO_PER_BANK)) {
286 writel(mask, &at91_port->ifscer);
287 writel(div & PIO_SCDR_DIV, &at91_port->scdr);
288 writel(mask, &at91_port->ifer);
290 writel(mask, &at91_port->ifdr);
298 * enable/disable the pull-down.
299 * If pull-up already enabled while calling the function, we disable it.
301 int at91_set_pio_pulldown(unsigned port, unsigned pin, int is_on)
303 struct at91_port *at91_port = at91_pio_get_port(port);
306 if (at91_port && (pin < GPIO_PER_BANK)) {
308 writel(mask, &at91_port->pudr);
310 writel(mask, &at91_port->ppder);
312 writel(mask, &at91_port->ppddr);
319 * disable Schmitt trigger
321 int at91_set_pio_disable_schmitt_trig(unsigned port, unsigned pin)
323 struct at91_port *at91_port = at91_pio_get_port(port);
326 if (at91_port && (pin < GPIO_PER_BANK)) {
328 writel(readl(&at91_port->schmitt) | mask,
329 &at91_port->schmitt);
337 * enable/disable the multi-driver. This is only valid for output and
338 * allows the output pin to run as an open collector output.
340 int at91_set_pio_multi_drive(unsigned port, unsigned pin, int is_on)
342 struct at91_port *at91_port = at91_pio_get_port(port);
345 if (at91_port && (pin < GPIO_PER_BANK)) {
348 writel(mask, &at91_port->mder);
350 writel(mask, &at91_port->mddr);
356 static void at91_set_port_value(struct at91_port *at91_port, int offset,
363 writel(mask, &at91_port->sodr);
365 writel(mask, &at91_port->codr);
369 * assuming the pin is muxed as a gpio output, set its value.
371 int at91_set_pio_value(unsigned port, unsigned pin, int value)
373 struct at91_port *at91_port = at91_pio_get_port(port);
375 if (at91_port && (pin < GPIO_PER_BANK))
376 at91_set_port_value(at91_port, pin, value);
381 static int at91_get_port_value(struct at91_port *at91_port, int offset)
386 pdsr = readl(&at91_port->pdsr) & mask;
391 * read the pin's value (works even if it's not muxed as a gpio).
393 int at91_get_pio_value(unsigned port, unsigned pin)
395 struct at91_port *at91_port = at91_pio_get_port(port);
397 if (at91_port && (pin < GPIO_PER_BANK))
398 return at91_get_port_value(at91_port, pin);
403 #ifndef CONFIG_DM_GPIO
404 /* Common GPIO API */
406 int gpio_request(unsigned gpio, const char *label)
411 int gpio_free(unsigned gpio)
416 int gpio_direction_input(unsigned gpio)
418 at91_set_pio_input(at91_gpio_to_port(gpio),
419 at91_gpio_to_pin(gpio), 0);
423 int gpio_direction_output(unsigned gpio, int value)
425 at91_set_pio_output(at91_gpio_to_port(gpio),
426 at91_gpio_to_pin(gpio), value);
430 int gpio_get_value(unsigned gpio)
432 return at91_get_pio_value(at91_gpio_to_port(gpio),
433 at91_gpio_to_pin(gpio));
436 int gpio_set_value(unsigned gpio, int value)
438 at91_set_pio_value(at91_gpio_to_port(gpio),
439 at91_gpio_to_pin(gpio), value);
445 #ifdef CONFIG_DM_GPIO
447 struct at91_port_priv {
448 struct at91_port *regs;
451 /* set GPIO pin 'gpio' as an input */
452 static int at91_gpio_direction_input(struct udevice *dev, unsigned offset)
454 struct at91_port_priv *port = dev_get_priv(dev);
456 at91_set_port_input(port->regs, offset, 0);
461 /* set GPIO pin 'gpio' as an output, with polarity 'value' */
462 static int at91_gpio_direction_output(struct udevice *dev, unsigned offset,
465 struct at91_port_priv *port = dev_get_priv(dev);
467 at91_set_port_output(port->regs, offset, value);
472 /* read GPIO IN value of pin 'gpio' */
473 static int at91_gpio_get_value(struct udevice *dev, unsigned offset)
475 struct at91_port_priv *port = dev_get_priv(dev);
477 return at91_get_port_value(port->regs, offset);
480 /* write GPIO OUT value to pin 'gpio' */
481 static int at91_gpio_set_value(struct udevice *dev, unsigned offset,
484 struct at91_port_priv *port = dev_get_priv(dev);
486 at91_set_port_value(port->regs, offset, value);
491 static int at91_gpio_get_function(struct udevice *dev, unsigned offset)
493 struct at91_port_priv *port = dev_get_priv(dev);
495 /* GPIOF_FUNC is not implemented yet */
496 if (at91_get_port_output(port->regs, offset))
502 static const struct dm_gpio_ops gpio_at91_ops = {
503 .direction_input = at91_gpio_direction_input,
504 .direction_output = at91_gpio_direction_output,
505 .get_value = at91_gpio_get_value,
506 .set_value = at91_gpio_set_value,
507 .get_function = at91_gpio_get_function,
510 static int at91_gpio_probe(struct udevice *dev)
512 struct at91_port_priv *port = dev_get_priv(dev);
513 struct at91_port_platdata *plat = dev_get_platdata(dev);
514 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
516 uc_priv->bank_name = plat->bank_name;
517 uc_priv->gpio_count = GPIO_PER_BANK;
518 port->regs = (struct at91_port *)plat->base_addr;
523 U_BOOT_DRIVER(gpio_at91) = {
526 .ops = &gpio_at91_ops,
527 .probe = at91_gpio_probe,
528 .priv_auto_alloc_size = sizeof(struct at91_port_priv),