1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2011 The Chromium OS Authors.
11 #include <acpi/acpi_device.h>
14 #include <dm/device-internal.h>
15 #include <dm/device_compat.h>
18 #include <dm/pinctrl.h>
19 #include <dt-bindings/gpio/gpio.h>
20 #include <dt-bindings/gpio/sandbox-gpio.h>
24 const char *label; /* label given by requester */
25 ulong flags; /* flags (GPIOD_...) */
28 /* Access routines for GPIO info */
29 static struct gpio_state *get_gpio_state(struct udevice *dev, uint offset)
31 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
32 struct gpio_state *state = dev_get_priv(dev);
34 if (offset >= uc_priv->gpio_count) {
35 printf("sandbox_gpio: error: invalid gpio %u\n", offset);
39 return &state[offset];
42 /* Access routines for GPIO flags */
43 static ulong *get_gpio_flags(struct udevice *dev, unsigned int offset)
45 struct gpio_state *state = get_gpio_state(dev, offset);
54 static int get_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag)
56 return (*get_gpio_flags(dev, offset) & flag) != 0;
59 static int set_gpio_flag(struct udevice *dev, unsigned int offset, ulong flag,
62 struct gpio_state *state = get_gpio_state(dev, offset);
67 state->flags &= ~flag;
73 * Back-channel sandbox-internal-only access to GPIO state
76 int sandbox_gpio_get_value(struct udevice *dev, unsigned offset)
78 struct gpio_state *state = get_gpio_state(dev, offset);
80 if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
81 debug("sandbox_gpio: get_value on output gpio %u\n", offset);
83 return state->flags & GPIOD_EXT_HIGH ? true : false;
86 int sandbox_gpio_set_value(struct udevice *dev, unsigned offset, int value)
88 set_gpio_flag(dev, offset, GPIOD_EXT_HIGH, value);
93 int sandbox_gpio_get_direction(struct udevice *dev, unsigned offset)
95 return get_gpio_flag(dev, offset, GPIOD_IS_OUT);
98 int sandbox_gpio_set_direction(struct udevice *dev, unsigned offset, int output)
100 set_gpio_flag(dev, offset, GPIOD_IS_OUT, output);
101 set_gpio_flag(dev, offset, GPIOD_IS_IN, !output);
106 ulong sandbox_gpio_get_flags(struct udevice *dev, uint offset)
108 ulong flags = *get_gpio_flags(dev, offset);
110 return flags & ~GPIOD_SANDBOX_MASK;
113 int sandbox_gpio_set_flags(struct udevice *dev, uint offset, ulong flags)
115 struct gpio_state *state = get_gpio_state(dev, offset);
118 * We don't need to clear GPIOD_EXT_HIGH here to make the tests pass,
119 * but this is handled in a future patch.
121 if (flags & GPIOD_IS_OUT_ACTIVE)
122 flags |= GPIOD_EXT_HIGH;
123 state->flags = (state->flags & GPIOD_SANDBOX_MASK) | flags;
129 * These functions implement the public interface within U-Boot
132 /* set GPIO port 'offset' as an input */
133 static int sb_gpio_direction_input(struct udevice *dev, unsigned offset)
135 debug("%s: offset:%u\n", __func__, offset);
137 return sandbox_gpio_set_direction(dev, offset, 0);
140 /* set GPIO port 'offset' as an output, with polarity 'value' */
141 static int sb_gpio_direction_output(struct udevice *dev, unsigned offset,
146 debug("%s: offset:%u, value = %d\n", __func__, offset, value);
148 ret = sandbox_gpio_set_direction(dev, offset, 1);
151 ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE | GPIOD_EXT_HIGH,
159 /* read GPIO IN value of port 'offset' */
160 static int sb_gpio_get_value(struct udevice *dev, unsigned offset)
162 debug("%s: offset:%u\n", __func__, offset);
164 return sandbox_gpio_get_value(dev, offset);
167 /* write GPIO OUT value to port 'offset' */
168 static int sb_gpio_set_value(struct udevice *dev, unsigned offset, int value)
172 debug("%s: offset:%u, value = %d\n", __func__, offset, value);
174 if (!sandbox_gpio_get_direction(dev, offset)) {
175 printf("sandbox_gpio: error: set_value on input gpio %u\n",
180 ret = set_gpio_flag(dev, offset, GPIOD_IS_OUT_ACTIVE | GPIOD_EXT_HIGH,
188 static int sb_gpio_get_function(struct udevice *dev, unsigned offset)
190 if (get_gpio_flag(dev, offset, GPIOD_IS_OUT))
192 if (get_gpio_flag(dev, offset, GPIOD_IS_IN))
195 return GPIOF_INPUT; /*GPIO is not configurated */
198 static int sb_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
199 struct ofnode_phandle_args *args)
201 desc->offset = args->args[0];
202 if (args->args_count < 2)
204 /* treat generic binding with gpio uclass */
205 gpio_xlate_offs_flags(dev, desc, args);
207 /* sandbox test specific, not defined in gpio.h */
208 if (args->args[1] & GPIO_IN)
209 desc->flags |= GPIOD_IS_IN;
211 if (args->args[1] & GPIO_OUT)
212 desc->flags |= GPIOD_IS_OUT;
214 if (args->args[1] & GPIO_OUT_ACTIVE)
215 desc->flags |= GPIOD_IS_OUT_ACTIVE;
220 static int sb_gpio_set_flags(struct udevice *dev, unsigned int offset,
223 debug("%s: offset:%u, flags = %lx\n", __func__, offset, flags);
225 return sandbox_gpio_set_flags(dev, offset, flags);
228 static int sb_gpio_get_flags(struct udevice *dev, uint offset, ulong *flagsp)
230 debug("%s: offset:%u\n", __func__, offset);
231 *flagsp = *get_gpio_flags(dev, offset);
236 #if CONFIG_IS_ENABLED(ACPIGEN)
237 static int sb_gpio_get_acpi(const struct gpio_desc *desc,
238 struct acpi_gpio *gpio)
242 /* Note that gpio_get_acpi() zeroes *gpio before calling here */
244 gpio->pins[0] = desc->offset;
245 ret = acpi_device_scope(desc->dev, gpio->resource,
246 sizeof(gpio->resource));
250 /* All of these values are just used for testing */
251 if (desc->flags & GPIOD_ACTIVE_LOW) {
252 gpio->pin0_addr = 0x80012 + desc->offset;
253 gpio->type = ACPI_GPIO_TYPE_INTERRUPT;
254 gpio->pull = ACPI_GPIO_PULL_DOWN;
255 gpio->interrupt_debounce_timeout = 4321;
257 /* We use the GpioInt part */
258 gpio->irq.pin = desc->offset;
259 gpio->irq.polarity = ACPI_IRQ_ACTIVE_BOTH;
260 gpio->irq.shared = ACPI_IRQ_SHARED;
261 gpio->irq.wake = ACPI_IRQ_WAKE;
263 /* The GpioIo part is only used for testing */
264 gpio->polarity = ACPI_GPIO_ACTIVE_LOW;
266 gpio->pin0_addr = 0xc00dc + desc->offset;
267 gpio->type = ACPI_GPIO_TYPE_IO;
268 gpio->pull = ACPI_GPIO_PULL_UP;
269 gpio->interrupt_debounce_timeout = 0;
271 /* The GpioInt part is not used */
273 /* We use the GpioIo part */
274 gpio->output_drive_strength = 1234;
275 gpio->io_shared = true;
276 gpio->io_restrict = ACPI_GPIO_IO_RESTRICT_INPUT;
283 static int sb_gpio_get_name(const struct udevice *dev, char *out_name)
285 return acpi_copy_name(out_name, "GPIO");
288 struct acpi_ops gpio_sandbox_acpi_ops = {
289 .get_name = sb_gpio_get_name,
293 static const struct dm_gpio_ops gpio_sandbox_ops = {
294 .direction_input = sb_gpio_direction_input,
295 .direction_output = sb_gpio_direction_output,
296 .get_value = sb_gpio_get_value,
297 .set_value = sb_gpio_set_value,
298 .get_function = sb_gpio_get_function,
299 .xlate = sb_gpio_xlate,
300 .set_flags = sb_gpio_set_flags,
301 .get_flags = sb_gpio_get_flags,
302 #if CONFIG_IS_ENABLED(ACPIGEN)
303 .get_acpi = sb_gpio_get_acpi,
307 static int sandbox_gpio_of_to_plat(struct udevice *dev)
309 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
311 uc_priv->gpio_count = dev_read_u32_default(dev, "sandbox,gpio-count",
313 uc_priv->bank_name = dev_read_string(dev, "gpio-bank-name");
318 static int gpio_sandbox_probe(struct udevice *dev)
320 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
322 if (!dev_has_ofnode(dev))
323 /* Tell the uclass how many GPIOs we have */
324 uc_priv->gpio_count = CONFIG_SANDBOX_GPIO_COUNT;
327 calloc(sizeof(struct gpio_state), uc_priv->gpio_count));
332 static int gpio_sandbox_remove(struct udevice *dev)
334 free(dev_get_priv(dev));
339 static const struct udevice_id sandbox_gpio_ids[] = {
340 { .compatible = "sandbox,gpio" },
344 U_BOOT_DRIVER(sandbox_gpio) = {
345 .name = "sandbox_gpio",
347 .of_match = sandbox_gpio_ids,
348 .of_to_plat = sandbox_gpio_of_to_plat,
349 .probe = gpio_sandbox_probe,
350 .remove = gpio_sandbox_remove,
351 .ops = &gpio_sandbox_ops,
352 ACPI_OPS_PTR(&gpio_sandbox_acpi_ops)
355 DM_DRIVER_ALIAS(sandbox_gpio, sandbox_gpio_alias)
357 /* pincontrol: used only to check GPIO pin configuration (pinmux command) */
359 struct sb_pinctrl_priv {
361 struct list_head gpio_dev;
364 struct sb_gpio_bank {
365 struct udevice *gpio_dev;
366 struct list_head list;
369 static int sb_populate_gpio_dev_list(struct udevice *dev)
371 struct sb_pinctrl_priv *priv = dev_get_priv(dev);
372 struct udevice *gpio_dev;
373 struct udevice *child;
374 struct sb_gpio_bank *gpio_bank;
378 * parse pin-controller sub-nodes (ie gpio bank nodes) and fill
379 * a list with all gpio device reference which belongs to the
380 * current pin-controller. This list is used to find pin_name and
383 list_for_each_entry(child, &dev->child_head, sibling_node) {
384 ret = uclass_get_device_by_name(UCLASS_GPIO, child->name,
389 gpio_bank = malloc(sizeof(*gpio_bank));
391 dev_err(dev, "Not enough memory\n");
395 gpio_bank->gpio_dev = gpio_dev;
396 list_add_tail(&gpio_bank->list, &priv->gpio_dev);
402 static int sb_pinctrl_get_pins_count(struct udevice *dev)
404 struct sb_pinctrl_priv *priv = dev_get_priv(dev);
405 struct gpio_dev_priv *uc_priv;
406 struct sb_gpio_bank *gpio_bank;
409 * if get_pins_count has already been executed once on this
410 * pin-controller, no need to run it again
412 if (priv->pinctrl_ngpios)
413 return priv->pinctrl_ngpios;
415 if (list_empty(&priv->gpio_dev))
416 sb_populate_gpio_dev_list(dev);
418 * walk through all banks to retrieve the pin-controller
421 list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
422 uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
424 priv->pinctrl_ngpios += uc_priv->gpio_count;
427 return priv->pinctrl_ngpios;
430 static struct udevice *sb_pinctrl_get_gpio_dev(struct udevice *dev,
431 unsigned int selector,
434 struct sb_pinctrl_priv *priv = dev_get_priv(dev);
435 struct sb_gpio_bank *gpio_bank;
436 struct gpio_dev_priv *uc_priv;
439 if (list_empty(&priv->gpio_dev))
440 sb_populate_gpio_dev_list(dev);
442 /* look up for the bank which owns the requested pin */
443 list_for_each_entry(gpio_bank, &priv->gpio_dev, list) {
444 uc_priv = dev_get_uclass_priv(gpio_bank->gpio_dev);
446 if (selector < (pin_count + uc_priv->gpio_count)) {
448 * we found the bank, convert pin selector to
451 *idx = selector - pin_count;
453 return gpio_bank->gpio_dev;
455 pin_count += uc_priv->gpio_count;
461 static const char *sb_pinctrl_get_pin_name(struct udevice *dev,
462 unsigned int selector)
464 struct gpio_dev_priv *uc_priv;
465 struct udevice *gpio_dev;
466 unsigned int gpio_idx;
467 static char pin_name[PINNAME_SIZE];
469 /* look up for the bank which owns the requested pin */
470 gpio_dev = sb_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
472 snprintf(pin_name, PINNAME_SIZE, "Error");
474 uc_priv = dev_get_uclass_priv(gpio_dev);
476 snprintf(pin_name, PINNAME_SIZE, "%s%d",
484 static char *get_flags_string(ulong flags)
486 if (flags & GPIOD_OPEN_DRAIN)
487 return "drive-open-drain";
488 if (flags & GPIOD_OPEN_SOURCE)
489 return "drive-open-source";
490 if (flags & GPIOD_PULL_UP)
491 return "bias-pull-up";
492 if (flags & GPIOD_PULL_DOWN)
493 return "bias-pull-down";
497 static int sb_pinctrl_get_pin_muxing(struct udevice *dev,
498 unsigned int selector,
501 struct udevice *gpio_dev;
502 unsigned int gpio_idx;
506 /* look up for the bank which owns the requested pin */
507 gpio_dev = sb_pinctrl_get_gpio_dev(dev, selector, &gpio_idx);
509 snprintf(buf, size, "Error");
511 function = sb_gpio_get_function(gpio_dev, gpio_idx);
512 flags = *get_gpio_flags(gpio_dev, gpio_idx);
514 snprintf(buf, size, "gpio %s %s",
515 function == GPIOF_OUTPUT ? "output" : "input",
516 get_flags_string(flags));
522 #if CONFIG_IS_ENABLED(ACPIGEN)
523 static int sb_pinctrl_get_name(const struct udevice *dev, char *out_name)
525 return acpi_copy_name(out_name, "PINC");
529 static int sandbox_pinctrl_probe(struct udevice *dev)
531 struct sb_pinctrl_priv *priv = dev_get_priv(dev);
533 INIT_LIST_HEAD(&priv->gpio_dev);
538 static struct pinctrl_ops sandbox_pinctrl_gpio_ops = {
539 .get_pin_name = sb_pinctrl_get_pin_name,
540 .get_pins_count = sb_pinctrl_get_pins_count,
541 .get_pin_muxing = sb_pinctrl_get_pin_muxing,
544 #if CONFIG_IS_ENABLED(ACPIGEN)
545 struct acpi_ops pinctrl_sandbox_acpi_ops = {
546 .get_name = sb_pinctrl_get_name,
550 static const struct udevice_id sandbox_pinctrl_gpio_match[] = {
551 { .compatible = "sandbox,pinctrl-gpio" },
555 U_BOOT_DRIVER(sandbox_pinctrl_gpio) = {
556 .name = "sandbox_pinctrl_gpio",
557 .id = UCLASS_PINCTRL,
558 .of_match = sandbox_pinctrl_gpio_match,
559 .ops = &sandbox_pinctrl_gpio_ops,
560 .bind = dm_scan_fdt_dev,
561 .probe = sandbox_pinctrl_probe,
562 .priv_auto = sizeof(struct sb_pinctrl_priv),
563 ACPI_OPS_PTR(&pinctrl_sandbox_acpi_ops)