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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (c) 2013 Google, Inc
- */
- #define LOG_CATEGORY UCLASS_GPIO
- #include <common.h>
- #include <dm.h>
- #include <log.h>
- #include <dm/devres.h>
- #include <dm/device_compat.h>
- #include <dm/device-internal.h>
- #include <dm/lists.h>
- #include <dm/uclass-internal.h>
- #include <dt-bindings/gpio/gpio.h>
- #include <errno.h>
- #include <fdtdec.h>
- #include <malloc.h>
- #include <acpi/acpi_device.h>
- #include <asm/global_data.h>
- #include <asm/gpio.h>
- #include <dm/device_compat.h>
- #include <linux/bug.h>
- #include <linux/ctype.h>
- #include <linux/delay.h>
- DECLARE_GLOBAL_DATA_PTR;
- /**
- * gpio_desc_init() - Initialize the GPIO descriptor
- *
- * @desc: GPIO descriptor to initialize
- * @dev: GPIO device
- * @offset: Offset of device GPIO
- */
- static void gpio_desc_init(struct gpio_desc *desc,
- struct udevice *dev,
- uint offset)
- {
- desc->dev = dev;
- desc->offset = offset;
- desc->flags = 0;
- }
- /**
- * gpio_to_device() - Convert global GPIO number to device, number
- *
- * Convert the GPIO number to an entry in the list of GPIOs
- * or GPIO blocks registered with the GPIO controller. Returns
- * entry on success, NULL on error.
- *
- * @gpio: The numeric representation of the GPIO
- * @desc: Returns description (desc->flags will always be 0)
- * @return 0 if found, -ENOENT if not found
- */
- static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
- {
- struct gpio_dev_priv *uc_priv;
- struct udevice *dev;
- int ret;
- for (ret = uclass_first_device(UCLASS_GPIO, &dev);
- dev;
- ret = uclass_next_device(&dev)) {
- uc_priv = dev_get_uclass_priv(dev);
- if (gpio >= uc_priv->gpio_base &&
- gpio < uc_priv->gpio_base + uc_priv->gpio_count) {
- gpio_desc_init(desc, dev, gpio - uc_priv->gpio_base);
- return 0;
- }
- }
- /* No such GPIO */
- return ret ? ret : -ENOENT;
- }
- #if CONFIG_IS_ENABLED(DM_GPIO_LOOKUP_LABEL)
- /**
- * dm_gpio_lookup_label() - look for name in gpio device
- *
- * search in uc_priv, if there is a gpio with labelname same
- * as name.
- *
- * @name: name which is searched
- * @uc_priv: gpio_dev_priv pointer.
- * @offset: gpio offset within the device
- * @return: 0 if found, -ENOENT if not.
- */
- static int dm_gpio_lookup_label(const char *name,
- struct gpio_dev_priv *uc_priv, ulong *offset)
- {
- int len;
- int i;
- *offset = -1;
- len = strlen(name);
- for (i = 0; i < uc_priv->gpio_count; i++) {
- if (!uc_priv->name[i])
- continue;
- if (!strncmp(name, uc_priv->name[i], len)) {
- *offset = i;
- return 0;
- }
- }
- return -ENOENT;
- }
- #else
- static int
- dm_gpio_lookup_label(const char *name, struct gpio_dev_priv *uc_priv,
- ulong *offset)
- {
- return -ENOENT;
- }
- #endif
- int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
- {
- struct gpio_dev_priv *uc_priv = NULL;
- struct udevice *dev;
- ulong offset;
- int numeric;
- int ret;
- numeric = isdigit(*name) ? dectoul(name, NULL) : -1;
- for (ret = uclass_first_device(UCLASS_GPIO, &dev);
- dev;
- ret = uclass_next_device(&dev)) {
- int len;
- uc_priv = dev_get_uclass_priv(dev);
- if (numeric != -1) {
- offset = numeric - uc_priv->gpio_base;
- /* Allow GPIOs to be numbered from 0 */
- if (offset < uc_priv->gpio_count)
- break;
- }
- len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0;
- if (!strncasecmp(name, uc_priv->bank_name, len)) {
- if (!strict_strtoul(name + len, 10, &offset))
- break;
- }
- /*
- * if we did not found a gpio through its bank
- * name, we search for a valid gpio label.
- */
- if (!dm_gpio_lookup_label(name, uc_priv, &offset))
- break;
- }
- if (!dev)
- return ret ? ret : -EINVAL;
- gpio_desc_init(desc, dev, offset);
- return 0;
- }
- int gpio_lookup_name(const char *name, struct udevice **devp,
- unsigned int *offsetp, unsigned int *gpiop)
- {
- struct gpio_desc desc;
- int ret;
- if (devp)
- *devp = NULL;
- ret = dm_gpio_lookup_name(name, &desc);
- if (ret)
- return ret;
- if (devp)
- *devp = desc.dev;
- if (offsetp)
- *offsetp = desc.offset;
- if (gpiop) {
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc.dev);
- *gpiop = uc_priv->gpio_base + desc.offset;
- }
- return 0;
- }
- int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
- struct ofnode_phandle_args *args)
- {
- if (args->args_count < 1)
- return -EINVAL;
- desc->offset = args->args[0];
- if (args->args_count < 2)
- return 0;
- desc->flags = 0;
- if (args->args[1] & GPIO_ACTIVE_LOW)
- desc->flags |= GPIOD_ACTIVE_LOW;
- /*
- * need to test 2 bits for gpio output binding:
- * OPEN_DRAIN (0x6) = SINGLE_ENDED (0x2) | LINE_OPEN_DRAIN (0x4)
- * OPEN_SOURCE (0x2) = SINGLE_ENDED (0x2) | LINE_OPEN_SOURCE (0x0)
- */
- if (args->args[1] & GPIO_SINGLE_ENDED) {
- if (args->args[1] & GPIO_LINE_OPEN_DRAIN)
- desc->flags |= GPIOD_OPEN_DRAIN;
- else
- desc->flags |= GPIOD_OPEN_SOURCE;
- }
- if (args->args[1] & GPIO_PULL_UP)
- desc->flags |= GPIOD_PULL_UP;
- if (args->args[1] & GPIO_PULL_DOWN)
- desc->flags |= GPIOD_PULL_DOWN;
- return 0;
- }
- static int gpio_find_and_xlate(struct gpio_desc *desc,
- struct ofnode_phandle_args *args)
- {
- const struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
- if (ops->xlate)
- return ops->xlate(desc->dev, desc, args);
- else
- return gpio_xlate_offs_flags(desc->dev, desc, args);
- }
- #if defined(CONFIG_GPIO_HOG)
- struct gpio_hog_priv {
- struct gpio_desc gpiod;
- };
- struct gpio_hog_data {
- int gpiod_flags;
- int value;
- u32 val[2];
- };
- static int gpio_hog_of_to_plat(struct udevice *dev)
- {
- struct gpio_hog_data *plat = dev_get_plat(dev);
- const char *nodename;
- int ret;
- plat->value = 0;
- if (dev_read_bool(dev, "input")) {
- plat->gpiod_flags = GPIOD_IS_IN;
- } else if (dev_read_bool(dev, "output-high")) {
- plat->value = 1;
- plat->gpiod_flags = GPIOD_IS_OUT;
- } else if (dev_read_bool(dev, "output-low")) {
- plat->gpiod_flags = GPIOD_IS_OUT;
- } else {
- printf("%s: missing gpio-hog state.\n", __func__);
- return -EINVAL;
- }
- ret = dev_read_u32_array(dev, "gpios", plat->val, 2);
- if (ret) {
- printf("%s: wrong gpios property, 2 values needed %d\n",
- __func__, ret);
- return ret;
- }
- nodename = dev_read_string(dev, "line-name");
- if (nodename)
- device_set_name(dev, nodename);
- return 0;
- }
- static int gpio_hog_probe(struct udevice *dev)
- {
- struct gpio_hog_data *plat = dev_get_plat(dev);
- struct gpio_hog_priv *priv = dev_get_priv(dev);
- int ret;
- ret = gpio_dev_request_index(dev->parent, dev->name, "gpio-hog",
- plat->val[0], plat->gpiod_flags,
- plat->val[1], &priv->gpiod);
- if (ret < 0) {
- debug("%s: node %s could not get gpio.\n", __func__,
- dev->name);
- return ret;
- }
- if (plat->gpiod_flags == GPIOD_IS_OUT) {
- ret = dm_gpio_set_value(&priv->gpiod, plat->value);
- if (ret < 0) {
- debug("%s: node %s could not set gpio.\n", __func__,
- dev->name);
- return ret;
- }
- }
- return 0;
- }
- int gpio_hog_probe_all(void)
- {
- struct udevice *dev;
- int ret;
- int retval = 0;
- for (uclass_first_device(UCLASS_NOP, &dev);
- dev;
- uclass_find_next_device(&dev)) {
- if (dev->driver == DM_DRIVER_GET(gpio_hog)) {
- ret = device_probe(dev);
- if (ret) {
- printf("Failed to probe device %s err: %d\n",
- dev->name, ret);
- retval = ret;
- }
- }
- }
- return retval;
- }
- int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
- {
- struct udevice *dev;
- *desc = NULL;
- gpio_hog_probe_all();
- if (!uclass_get_device_by_name(UCLASS_NOP, name, &dev)) {
- struct gpio_hog_priv *priv = dev_get_priv(dev);
- *desc = &priv->gpiod;
- return 0;
- }
- return -ENODEV;
- }
- U_BOOT_DRIVER(gpio_hog) = {
- .name = "gpio_hog",
- .id = UCLASS_NOP,
- .of_to_plat = gpio_hog_of_to_plat,
- .probe = gpio_hog_probe,
- .priv_auto = sizeof(struct gpio_hog_priv),
- .plat_auto = sizeof(struct gpio_hog_data),
- };
- #else
- int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
- {
- return 0;
- }
- #endif
- int dm_gpio_request(struct gpio_desc *desc, const char *label)
- {
- const struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
- struct udevice *dev = desc->dev;
- struct gpio_dev_priv *uc_priv;
- char *str;
- int ret;
- uc_priv = dev_get_uclass_priv(dev);
- if (uc_priv->name[desc->offset])
- return -EBUSY;
- str = strdup(label);
- if (!str)
- return -ENOMEM;
- if (ops->request) {
- ret = ops->request(dev, desc->offset, label);
- if (ret) {
- free(str);
- return ret;
- }
- }
- uc_priv->name[desc->offset] = str;
- return 0;
- }
- static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...)
- {
- #if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
- va_list args;
- char buf[40];
- va_start(args, fmt);
- vscnprintf(buf, sizeof(buf), fmt, args);
- va_end(args);
- return dm_gpio_request(desc, buf);
- #else
- return dm_gpio_request(desc, fmt);
- #endif
- }
- /**
- * gpio_request() - [COMPAT] Request GPIO
- * gpio: GPIO number
- * label: Name for the requested GPIO
- *
- * The label is copied and allocated so the caller does not need to keep
- * the pointer around.
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns 0 on success, negative value on error.
- */
- int gpio_request(unsigned gpio, const char *label)
- {
- struct gpio_desc desc;
- int ret;
- ret = gpio_to_device(gpio, &desc);
- if (ret)
- return ret;
- return dm_gpio_request(&desc, label);
- }
- /**
- * gpio_requestf() - [COMPAT] Request GPIO
- * @gpio: GPIO number
- * @fmt: Format string for the requested GPIO
- * @...: Arguments for the printf() format string
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns 0 on success, negative value on error.
- */
- int gpio_requestf(unsigned gpio, const char *fmt, ...)
- {
- #if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
- va_list args;
- char buf[40];
- va_start(args, fmt);
- vscnprintf(buf, sizeof(buf), fmt, args);
- va_end(args);
- return gpio_request(gpio, buf);
- #else
- return gpio_request(gpio, fmt);
- #endif
- }
- int _dm_gpio_free(struct udevice *dev, uint offset)
- {
- const struct dm_gpio_ops *ops = gpio_get_ops(dev);
- struct gpio_dev_priv *uc_priv;
- int ret;
- uc_priv = dev_get_uclass_priv(dev);
- if (!uc_priv->name[offset])
- return -ENXIO;
- if (ops->rfree) {
- ret = ops->rfree(dev, offset);
- if (ret)
- return ret;
- }
- free(uc_priv->name[offset]);
- uc_priv->name[offset] = NULL;
- return 0;
- }
- /**
- * gpio_free() - [COMPAT] Relinquish GPIO
- * gpio: GPIO number
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns 0 on success, negative value on error.
- */
- int gpio_free(unsigned gpio)
- {
- struct gpio_desc desc;
- int ret;
- ret = gpio_to_device(gpio, &desc);
- if (ret)
- return ret;
- return _dm_gpio_free(desc.dev, desc.offset);
- }
- static int check_reserved(const struct gpio_desc *desc, const char *func)
- {
- struct gpio_dev_priv *uc_priv;
- if (!dm_gpio_is_valid(desc))
- return -ENOENT;
- uc_priv = dev_get_uclass_priv(desc->dev);
- if (!uc_priv->name[desc->offset]) {
- printf("%s: %s: error: gpio %s%d not reserved\n",
- desc->dev->name, func,
- uc_priv->bank_name ? uc_priv->bank_name : "",
- desc->offset);
- return -EBUSY;
- }
- return 0;
- }
- /**
- * gpio_direction_input() - [COMPAT] Set GPIO direction to input
- * gpio: GPIO number
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns 0 on success, negative value on error.
- */
- int gpio_direction_input(unsigned gpio)
- {
- struct gpio_desc desc;
- int ret;
- ret = gpio_to_device(gpio, &desc);
- if (ret)
- return ret;
- return dm_gpio_clrset_flags(&desc, GPIOD_MASK_DIR, GPIOD_IS_IN);
- }
- /**
- * gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value
- * gpio: GPIO number
- * value: Logical value to be set on the GPIO pin
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns 0 on success, negative value on error.
- */
- int gpio_direction_output(unsigned gpio, int value)
- {
- struct gpio_desc desc;
- ulong flags;
- int ret;
- ret = gpio_to_device(gpio, &desc);
- if (ret)
- return ret;
- flags = GPIOD_IS_OUT;
- if (value)
- flags |= GPIOD_IS_OUT_ACTIVE;
- return dm_gpio_clrset_flags(&desc, GPIOD_MASK_DIR, flags);
- }
- static int _gpio_get_value(const struct gpio_desc *desc)
- {
- const struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
- int value;
- value = ops->get_value(desc->dev, desc->offset);
- return desc->flags & GPIOD_ACTIVE_LOW ? !value : value;
- }
- int dm_gpio_get_value(const struct gpio_desc *desc)
- {
- int ret;
- ret = check_reserved(desc, "get_value");
- if (ret)
- return ret;
- return _gpio_get_value(desc);
- }
- int dm_gpio_set_value(const struct gpio_desc *desc, int value)
- {
- const struct dm_gpio_ops *ops;
- int ret;
- ret = check_reserved(desc, "set_value");
- if (ret)
- return ret;
- if (desc->flags & GPIOD_ACTIVE_LOW)
- value = !value;
- /* GPIOD_ are directly managed by driver in set_flags */
- ops = gpio_get_ops(desc->dev);
- if (ops->set_flags) {
- ulong flags = desc->flags;
- if (value)
- flags |= GPIOD_IS_OUT_ACTIVE;
- else
- flags &= ~GPIOD_IS_OUT_ACTIVE;
- return ops->set_flags(desc->dev, desc->offset, flags);
- }
- /*
- * Emulate open drain by not actively driving the line high or
- * Emulate open source by not actively driving the line low
- */
- if ((desc->flags & GPIOD_OPEN_DRAIN && value) ||
- (desc->flags & GPIOD_OPEN_SOURCE && !value))
- return ops->direction_input(desc->dev, desc->offset);
- else if (desc->flags & GPIOD_OPEN_DRAIN ||
- desc->flags & GPIOD_OPEN_SOURCE)
- return ops->direction_output(desc->dev, desc->offset, value);
- ret = ops->set_value(desc->dev, desc->offset, value);
- if (ret)
- return ret;
- return 0;
- }
- /* check dir flags invalid configuration */
- static int check_dir_flags(ulong flags)
- {
- if ((flags & GPIOD_IS_OUT) && (flags & GPIOD_IS_IN)) {
- log_debug("%s: flags 0x%lx has GPIOD_IS_OUT and GPIOD_IS_IN\n",
- __func__, flags);
- return -EINVAL;
- }
- if ((flags & GPIOD_PULL_UP) && (flags & GPIOD_PULL_DOWN)) {
- log_debug("%s: flags 0x%lx has GPIOD_PULL_UP and GPIOD_PULL_DOWN\n",
- __func__, flags);
- return -EINVAL;
- }
- if ((flags & GPIOD_OPEN_DRAIN) && (flags & GPIOD_OPEN_SOURCE)) {
- log_debug("%s: flags 0x%lx has GPIOD_OPEN_DRAIN and GPIOD_OPEN_SOURCE\n",
- __func__, flags);
- return -EINVAL;
- }
- return 0;
- }
- /**
- * _dm_gpio_set_flags() - Send flags to the driver
- *
- * This uses the best available method to send the given flags to the driver.
- * Note that if flags & GPIOD_ACTIVE_LOW, the driver sees the opposite value
- * of GPIOD_IS_OUT_ACTIVE.
- *
- * @desc: GPIO description
- * @flags: flags value to set
- * @return 0 if OK, -ve on error
- */
- static int _dm_gpio_set_flags(struct gpio_desc *desc, ulong flags)
- {
- struct udevice *dev = desc->dev;
- const struct dm_gpio_ops *ops = gpio_get_ops(dev);
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- int ret = 0;
- ret = check_dir_flags(flags);
- if (ret) {
- dev_dbg(dev,
- "%s error: set_dir_flags for gpio %s%d has invalid dir flags 0x%lx\n",
- desc->dev->name,
- uc_priv->bank_name ? uc_priv->bank_name : "",
- desc->offset, flags);
- return ret;
- }
- /* If active low, invert the output state */
- if ((flags & (GPIOD_IS_OUT | GPIOD_ACTIVE_LOW)) ==
- (GPIOD_IS_OUT | GPIOD_ACTIVE_LOW))
- flags ^= GPIOD_IS_OUT_ACTIVE;
- /* GPIOD_ are directly managed by driver in set_flags */
- if (ops->set_flags) {
- ret = ops->set_flags(dev, desc->offset, flags);
- } else {
- if (flags & GPIOD_IS_OUT) {
- bool value = flags & GPIOD_IS_OUT_ACTIVE;
- ret = ops->direction_output(dev, desc->offset, value);
- } else if (flags & GPIOD_IS_IN) {
- ret = ops->direction_input(dev, desc->offset);
- }
- }
- return ret;
- }
- int dm_gpio_clrset_flags(struct gpio_desc *desc, ulong clr, ulong set)
- {
- ulong flags;
- int ret;
- ret = check_reserved(desc, "set_dir_flags");
- if (ret)
- return ret;
- flags = (desc->flags & ~clr) | set;
- ret = _dm_gpio_set_flags(desc, flags);
- if (ret)
- return ret;
- /* save the flags also in descriptor */
- desc->flags = flags;
- return 0;
- }
- int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
- {
- /* combine the requested flags (for IN/OUT) and the descriptor flags */
- return dm_gpio_clrset_flags(desc, GPIOD_MASK_DIR, flags);
- }
- int dm_gpios_clrset_flags(struct gpio_desc *desc, int count, ulong clr,
- ulong set)
- {
- int ret;
- int i;
- for (i = 0; i < count; i++) {
- ret = dm_gpio_clrset_flags(&desc[i], clr, set);
- if (ret)
- return log_ret(ret);
- }
- return 0;
- }
- int dm_gpio_get_flags(struct gpio_desc *desc, ulong *flagsp)
- {
- struct udevice *dev = desc->dev;
- int ret, value;
- const struct dm_gpio_ops *ops = gpio_get_ops(dev);
- ulong flags;
- ret = check_reserved(desc, "get_flags");
- if (ret)
- return ret;
- /* GPIOD_ are directly provided by driver except GPIOD_ACTIVE_LOW */
- if (ops->get_flags) {
- ret = ops->get_flags(dev, desc->offset, &flags);
- if (ret)
- return ret;
- /* GPIOD_ACTIVE_LOW is saved in desc->flags */
- value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0;
- if (desc->flags & GPIOD_ACTIVE_LOW)
- value = !value;
- flags &= ~(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE);
- flags |= (desc->flags & GPIOD_ACTIVE_LOW);
- if (value)
- flags |= GPIOD_IS_OUT_ACTIVE;
- } else {
- flags = desc->flags;
- /* only GPIOD_IS_OUT_ACTIVE is provided by uclass */
- flags &= ~GPIOD_IS_OUT_ACTIVE;
- if ((desc->flags & GPIOD_IS_OUT) && _gpio_get_value(desc))
- flags |= GPIOD_IS_OUT_ACTIVE;
- }
- *flagsp = flags;
- return 0;
- }
- /**
- * gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value
- * gpio: GPIO number
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns the value of the GPIO pin, or negative value
- * on error.
- */
- int gpio_get_value(unsigned gpio)
- {
- int ret;
- struct gpio_desc desc;
- ret = gpio_to_device(gpio, &desc);
- if (ret)
- return ret;
- return dm_gpio_get_value(&desc);
- }
- /**
- * gpio_set_value() - [COMPAT] Configure logical value on GPIO pin
- * gpio: GPIO number
- * value: Logical value to be set on the GPIO pin.
- *
- * This function implements the API that's compatible with current
- * GPIO API used in U-Boot. The request is forwarded to particular
- * GPIO driver. Returns 0 on success, negative value on error.
- */
- int gpio_set_value(unsigned gpio, int value)
- {
- struct gpio_desc desc;
- int ret;
- ret = gpio_to_device(gpio, &desc);
- if (ret)
- return ret;
- return dm_gpio_set_value(&desc, value);
- }
- const char *gpio_get_bank_info(struct udevice *dev, int *bit_count)
- {
- struct gpio_dev_priv *priv;
- /* Must be called on an active device */
- priv = dev_get_uclass_priv(dev);
- assert(priv);
- *bit_count = priv->gpio_count;
- return priv->bank_name;
- }
- static const char * const gpio_function[GPIOF_COUNT] = {
- "input",
- "output",
- "unused",
- "unknown",
- "func",
- };
- static int get_function(struct udevice *dev, int offset, bool skip_unused,
- const char **namep)
- {
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- const struct dm_gpio_ops *ops = gpio_get_ops(dev);
- BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
- if (!device_active(dev))
- return -ENODEV;
- if (offset < 0 || offset >= uc_priv->gpio_count)
- return -EINVAL;
- if (namep)
- *namep = uc_priv->name[offset];
- if (skip_unused && !uc_priv->name[offset])
- return GPIOF_UNUSED;
- if (ops->get_function) {
- int ret;
- ret = ops->get_function(dev, offset);
- if (ret < 0)
- return ret;
- if (ret >= ARRAY_SIZE(gpio_function))
- return -ENODATA;
- return ret;
- }
- return GPIOF_UNKNOWN;
- }
- int gpio_get_function(struct udevice *dev, int offset, const char **namep)
- {
- return get_function(dev, offset, true, namep);
- }
- int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep)
- {
- return get_function(dev, offset, false, namep);
- }
- int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
- {
- const struct dm_gpio_ops *ops = gpio_get_ops(dev);
- struct gpio_dev_priv *priv;
- char *str = buf;
- int func;
- int ret;
- int len;
- BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
- *buf = 0;
- priv = dev_get_uclass_priv(dev);
- ret = gpio_get_raw_function(dev, offset, NULL);
- if (ret < 0)
- return ret;
- func = ret;
- len = snprintf(str, buffsize, "%s%d: %s",
- priv->bank_name ? priv->bank_name : "",
- offset, gpio_function[func]);
- if (func == GPIOF_INPUT || func == GPIOF_OUTPUT ||
- func == GPIOF_UNUSED) {
- const char *label;
- bool used;
- ret = ops->get_value(dev, offset);
- if (ret < 0)
- return ret;
- used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED;
- snprintf(str + len, buffsize - len, ": %d [%c]%s%s",
- ret,
- used ? 'x' : ' ',
- used ? " " : "",
- label ? label : "");
- }
- return 0;
- }
- #if CONFIG_IS_ENABLED(ACPIGEN)
- int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio)
- {
- const struct dm_gpio_ops *ops;
- memset(gpio, '\0', sizeof(*gpio));
- if (!dm_gpio_is_valid(desc)) {
- /* Indicate that the GPIO is not valid */
- gpio->pin_count = 0;
- gpio->pins[0] = 0;
- return -EINVAL;
- }
- ops = gpio_get_ops(desc->dev);
- if (!ops->get_acpi)
- return -ENOSYS;
- return ops->get_acpi(desc, gpio);
- }
- #endif
- int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
- {
- int i, ret;
- int gpio;
- for (i = 0; i < 32; i++) {
- gpio = gpio_num_array[i];
- if (gpio == -1)
- break;
- ret = gpio_requestf(gpio, fmt, i);
- if (ret)
- goto err;
- ret = gpio_direction_input(gpio);
- if (ret) {
- gpio_free(gpio);
- goto err;
- }
- }
- return 0;
- err:
- for (i--; i >= 0; i--)
- gpio_free(gpio_num_array[i]);
- return ret;
- }
- /*
- * get a number comprised of multiple GPIO values. gpio_num_array points to
- * the array of gpio pin numbers to scan, terminated by -1.
- */
- int gpio_get_values_as_int(const int *gpio_list)
- {
- int gpio;
- unsigned bitmask = 1;
- unsigned vector = 0;
- int ret;
- while (bitmask &&
- ((gpio = *gpio_list++) != -1)) {
- ret = gpio_get_value(gpio);
- if (ret < 0)
- return ret;
- else if (ret)
- vector |= bitmask;
- bitmask <<= 1;
- }
- return vector;
- }
- int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count)
- {
- unsigned bitmask = 1;
- unsigned vector = 0;
- int ret, i;
- for (i = 0; i < count; i++) {
- ret = dm_gpio_get_value(&desc_list[i]);
- if (ret < 0)
- return ret;
- else if (ret)
- vector |= bitmask;
- bitmask <<= 1;
- }
- return vector;
- }
- int dm_gpio_get_values_as_int_base3(struct gpio_desc *desc_list,
- int count)
- {
- static const char tristate[] = "01z";
- enum {
- PULLUP,
- PULLDOWN,
- NUM_OPTIONS,
- };
- int vals[NUM_OPTIONS];
- uint mask;
- uint vector = 0;
- int ret, i;
- /*
- * Limit to 19 digits which should be plenty. This avoids overflow of a
- * 32-bit int
- */
- assert(count < 20);
- for (i = 0; i < NUM_OPTIONS; i++) {
- uint flags = GPIOD_IS_IN;
- flags |= (i == PULLDOWN) ? GPIOD_PULL_DOWN : GPIOD_PULL_UP;
- ret = dm_gpios_clrset_flags(desc_list, count, GPIOD_MASK_PULL,
- flags);
- if (ret)
- return log_msg_ret("pu", ret);
- /* Give the lines time to settle */
- udelay(10);
- ret = dm_gpio_get_values_as_int(desc_list, count);
- if (ret < 0)
- return log_msg_ret("get1", ret);
- vals[i] = ret;
- }
- log_debug("values: %x %x, count = %d\n", vals[0], vals[1], count);
- for (i = count - 1, mask = 1 << i; i >= 0; i--, mask >>= 1) {
- uint pd = vals[PULLDOWN] & mask ? 1 : 0;
- uint pu = vals[PULLUP] & mask ? 1 : 0;
- uint digit;
- /*
- * Get value with internal pulldown active. If this is 1 then
- * there is a stronger external pullup, which we call 1. If not
- * then call it 0.
- *
- * If the values differ then the pin is floating so we call
- * this a 2.
- */
- if (pu == pd)
- digit = pd;
- else
- digit = 2;
- log_debug("%c ", tristate[digit]);
- vector = 3 * vector + digit;
- }
- log_debug("vector=%d\n", vector);
- return vector;
- }
- /**
- * gpio_request_tail: common work for requesting a gpio.
- *
- * ret: return value from previous work in function which calls
- * this function.
- * This seems bogus (why calling this function instead not
- * calling it and end caller function instead?).
- * Because on error in caller function we want to set some
- * default values in gpio desc and have a common error
- * debug message, which provides this function.
- * nodename: Name of node for which gpio gets requested
- * used for gpio label name.
- * args: pointer to output arguments structure
- * list_name: Name of GPIO list
- * used for gpio label name.
- * index: gpio index in gpio list
- * used for gpio label name.
- * desc: pointer to gpio descriptor, filled from this
- * function.
- * flags: gpio flags to use.
- * add_index: should index added to gpio label name
- * gpio_dev: pointer to gpio device from which the gpio
- * will be requested. If NULL try to get the
- * gpio device with uclass_get_device_by_ofnode()
- *
- * return: In error case this function sets default values in
- * gpio descriptor, also emmits a debug message.
- * On success it returns 0 else the error code from
- * function calls, or the error code passed through
- * ret to this function.
- *
- */
- static int gpio_request_tail(int ret, const char *nodename,
- struct ofnode_phandle_args *args,
- const char *list_name, int index,
- struct gpio_desc *desc, int flags,
- bool add_index, struct udevice *gpio_dev)
- {
- gpio_desc_init(desc, gpio_dev, 0);
- if (ret)
- goto err;
- if (!desc->dev) {
- ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
- &desc->dev);
- if (ret) {
- debug("%s: uclass_get_device_by_ofnode failed\n",
- __func__);
- goto err;
- }
- }
- ret = gpio_find_and_xlate(desc, args);
- if (ret) {
- debug("%s: gpio_find_and_xlate failed\n", __func__);
- goto err;
- }
- ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s",
- nodename, list_name, index);
- if (ret) {
- debug("%s: dm_gpio_requestf failed\n", __func__);
- goto err;
- }
- /* Keep any direction flags provided by the devicetree */
- ret = dm_gpio_set_dir_flags(desc,
- flags | (desc->flags & GPIOD_MASK_DIR));
- if (ret) {
- debug("%s: dm_gpio_set_dir failed\n", __func__);
- goto err;
- }
- return 0;
- err:
- debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n",
- __func__, nodename, list_name, index, ret);
- return ret;
- }
- #if !CONFIG_IS_ENABLED(OF_PLATDATA)
- static int _gpio_request_by_name_nodev(ofnode node, const char *list_name,
- int index, struct gpio_desc *desc,
- int flags, bool add_index)
- {
- struct ofnode_phandle_args args;
- int ret;
- ret = ofnode_parse_phandle_with_args(node, list_name, "#gpio-cells", 0,
- index, &args);
- return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
- index, desc, flags, add_index, NULL);
- }
- int gpio_request_by_name_nodev(ofnode node, const char *list_name, int index,
- struct gpio_desc *desc, int flags)
- {
- return _gpio_request_by_name_nodev(node, list_name, index, desc, flags,
- index > 0);
- }
- int gpio_request_by_name(struct udevice *dev, const char *list_name, int index,
- struct gpio_desc *desc, int flags)
- {
- struct ofnode_phandle_args args;
- ofnode node;
- int ret;
- ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0,
- index, &args);
- node = dev_ofnode(dev);
- return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
- index, desc, flags, index > 0, NULL);
- }
- int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
- struct gpio_desc *desc, int max_count,
- int flags)
- {
- int count;
- int ret;
- for (count = 0; count < max_count; count++) {
- ret = _gpio_request_by_name_nodev(node, list_name, count,
- &desc[count], flags, true);
- if (ret == -ENOENT)
- break;
- else if (ret)
- goto err;
- }
- /* We ran out of GPIOs in the list */
- return count;
- err:
- gpio_free_list_nodev(desc, count - 1);
- return ret;
- }
- int gpio_request_list_by_name(struct udevice *dev, const char *list_name,
- struct gpio_desc *desc, int max_count,
- int flags)
- {
- /*
- * This isn't ideal since we don't use dev->name in the debug()
- * calls in gpio_request_by_name(), but we can do this until
- * gpio_request_list_by_name_nodev() can be dropped.
- */
- return gpio_request_list_by_name_nodev(dev_ofnode(dev), list_name, desc,
- max_count, flags);
- }
- int gpio_get_list_count(struct udevice *dev, const char *list_name)
- {
- int ret;
- ret = dev_count_phandle_with_args(dev, list_name, "#gpio-cells",
- -ENOENT);
- if (ret < 0) {
- debug("%s: Node '%s', property '%s', GPIO count failed: %d\n",
- __func__, dev->name, list_name, ret);
- }
- return ret;
- }
- #endif /* OF_PLATDATA */
- int dm_gpio_free(struct udevice *dev, struct gpio_desc *desc)
- {
- /* For now, we don't do any checking of dev */
- return _dm_gpio_free(desc->dev, desc->offset);
- }
- int gpio_free_list(struct udevice *dev, struct gpio_desc *desc, int count)
- {
- int i;
- /* For now, we don't do any checking of dev */
- for (i = 0; i < count; i++)
- dm_gpio_free(dev, &desc[i]);
- return 0;
- }
- int gpio_free_list_nodev(struct gpio_desc *desc, int count)
- {
- return gpio_free_list(NULL, desc, count);
- }
- /* We need to renumber the GPIOs when any driver is probed/removed */
- static int gpio_renumber(struct udevice *removed_dev)
- {
- struct gpio_dev_priv *uc_priv;
- struct udevice *dev;
- struct uclass *uc;
- unsigned base;
- int ret;
- ret = uclass_get(UCLASS_GPIO, &uc);
- if (ret)
- return ret;
- /* Ensure that we have a base for each bank */
- base = 0;
- uclass_foreach_dev(dev, uc) {
- if (device_active(dev) && dev != removed_dev) {
- uc_priv = dev_get_uclass_priv(dev);
- uc_priv->gpio_base = base;
- base += uc_priv->gpio_count;
- }
- }
- return 0;
- }
- int gpio_get_number(const struct gpio_desc *desc)
- {
- struct udevice *dev = desc->dev;
- struct gpio_dev_priv *uc_priv;
- if (!dev)
- return -1;
- uc_priv = dev_get_uclass_priv(dev);
- return uc_priv->gpio_base + desc->offset;
- }
- static int gpio_post_probe(struct udevice *dev)
- {
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *));
- if (!uc_priv->name)
- return -ENOMEM;
- return gpio_renumber(NULL);
- }
- static int gpio_pre_remove(struct udevice *dev)
- {
- struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
- int i;
- for (i = 0; i < uc_priv->gpio_count; i++) {
- if (uc_priv->name[i])
- free(uc_priv->name[i]);
- }
- free(uc_priv->name);
- return gpio_renumber(dev);
- }
- int gpio_dev_request_index(struct udevice *dev, const char *nodename,
- char *list_name, int index, int flags,
- int dtflags, struct gpio_desc *desc)
- {
- struct ofnode_phandle_args args;
- args.node = ofnode_null();
- args.args_count = 2;
- args.args[0] = index;
- args.args[1] = dtflags;
- return gpio_request_tail(0, nodename, &args, list_name, index, desc,
- flags, 0, dev);
- }
- static void devm_gpiod_release(struct udevice *dev, void *res)
- {
- dm_gpio_free(dev, res);
- }
- static int devm_gpiod_match(struct udevice *dev, void *res, void *data)
- {
- return res == data;
- }
- struct gpio_desc *devm_gpiod_get_index(struct udevice *dev, const char *id,
- unsigned int index, int flags)
- {
- int rc;
- struct gpio_desc *desc;
- char *propname;
- static const char suffix[] = "-gpios";
- propname = malloc(strlen(id) + sizeof(suffix));
- if (!propname) {
- rc = -ENOMEM;
- goto end;
- }
- strcpy(propname, id);
- strcat(propname, suffix);
- desc = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc),
- __GFP_ZERO);
- if (unlikely(!desc)) {
- rc = -ENOMEM;
- goto end;
- }
- rc = gpio_request_by_name(dev, propname, index, desc, flags);
- end:
- if (propname)
- free(propname);
- if (rc)
- return ERR_PTR(rc);
- devres_add(dev, desc);
- return desc;
- }
- struct gpio_desc *devm_gpiod_get_index_optional(struct udevice *dev,
- const char *id,
- unsigned int index,
- int flags)
- {
- struct gpio_desc *desc = devm_gpiod_get_index(dev, id, index, flags);
- if (IS_ERR(desc))
- return NULL;
- return desc;
- }
- void devm_gpiod_put(struct udevice *dev, struct gpio_desc *desc)
- {
- int rc;
- rc = devres_release(dev, devm_gpiod_release, devm_gpiod_match, desc);
- WARN_ON(rc);
- }
- static int gpio_post_bind(struct udevice *dev)
- {
- struct udevice *child;
- ofnode node;
- #if defined(CONFIG_NEEDS_MANUAL_RELOC)
- struct dm_gpio_ops *ops = (struct dm_gpio_ops *)device_get_ops(dev);
- static int reloc_done;
- if (!reloc_done) {
- if (ops->request)
- ops->request += gd->reloc_off;
- if (ops->rfree)
- ops->rfree += gd->reloc_off;
- if (ops->direction_input)
- ops->direction_input += gd->reloc_off;
- if (ops->direction_output)
- ops->direction_output += gd->reloc_off;
- if (ops->get_value)
- ops->get_value += gd->reloc_off;
- if (ops->set_value)
- ops->set_value += gd->reloc_off;
- if (ops->get_function)
- ops->get_function += gd->reloc_off;
- if (ops->xlate)
- ops->xlate += gd->reloc_off;
- if (ops->set_flags)
- ops->set_flags += gd->reloc_off;
- if (ops->get_flags)
- ops->get_flags += gd->reloc_off;
- reloc_done++;
- }
- #endif
- if (IS_ENABLED(CONFIG_GPIO_HOG)) {
- dev_for_each_subnode(node, dev) {
- if (ofnode_read_bool(node, "gpio-hog")) {
- const char *name = ofnode_get_name(node);
- int ret;
- ret = device_bind_driver_to_node(dev,
- "gpio_hog",
- name, node,
- &child);
- if (ret)
- return ret;
- }
- }
- }
- return 0;
- }
- UCLASS_DRIVER(gpio) = {
- .id = UCLASS_GPIO,
- .name = "gpio",
- .flags = DM_UC_FLAG_SEQ_ALIAS,
- .post_probe = gpio_post_probe,
- .post_bind = gpio_post_bind,
- .pre_remove = gpio_pre_remove,
- .per_device_auto = sizeof(struct gpio_dev_priv),
- };
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