diff options
Diffstat (limited to 'drivers/gpio/gpio-uclass.c')
| -rw-r--r-- | drivers/gpio/gpio-uclass.c | 396 |
1 files changed, 325 insertions, 71 deletions
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c index 255700a..a69bbd2 100644 --- a/drivers/gpio/gpio-uclass.c +++ b/drivers/gpio/gpio-uclass.c @@ -7,20 +7,25 @@ #include <common.h> #include <dm.h> #include <errno.h> +#include <fdtdec.h> #include <malloc.h> #include <asm/gpio.h> #include <linux/ctype.h> +DECLARE_GLOBAL_DATA_PTR; + /** * gpio_to_device() - Convert global GPIO number to device, number - * gpio: The numeric representation of the GPIO * * 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 udevice **devp, - unsigned int *offset) +static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc) { struct gpio_dev_priv *uc_priv; struct udevice *dev; @@ -32,14 +37,15 @@ static int gpio_to_device(unsigned int gpio, struct udevice **devp, uc_priv = dev->uclass_priv; if (gpio >= uc_priv->gpio_base && gpio < uc_priv->gpio_base + uc_priv->gpio_count) { - *devp = dev; - *offset = gpio - uc_priv->gpio_base; + desc->dev = dev; + desc->offset = gpio - uc_priv->gpio_base; + desc->flags = 0; return 0; } } /* No such GPIO */ - return ret ? ret : -EINVAL; + return ret ? ret : -ENOENT; } int gpio_lookup_name(const char *name, struct udevice **devp, @@ -88,6 +94,57 @@ int gpio_lookup_name(const char *name, struct udevice **devp, return 0; } +static int gpio_find_and_xlate(struct gpio_desc *desc, + struct fdtdec_phandle_args *args) +{ + struct dm_gpio_ops *ops = gpio_get_ops(desc->dev); + + /* Use the first argument as the offset by default */ + if (args->args_count > 0) + desc->offset = args->args[0]; + else + desc->offset = -1; + desc->flags = 0; + + return ops->xlate ? ops->xlate(desc->dev, desc, args) : 0; +} + +static int dm_gpio_request(struct gpio_desc *desc, const char *label) +{ + struct udevice *dev = desc->dev; + struct gpio_dev_priv *uc_priv; + char *str; + int ret; + + uc_priv = dev->uclass_priv; + if (uc_priv->name[desc->offset]) + return -EBUSY; + str = strdup(label); + if (!str) + return -ENOMEM; + if (gpio_get_ops(dev)->request) { + ret = gpio_get_ops(dev)->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, ...) +{ + 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); +} + /** * gpio_request() - [COMPAT] Request GPIO * gpio: GPIO number @@ -102,32 +159,14 @@ int gpio_lookup_name(const char *name, struct udevice **devp, */ int gpio_request(unsigned gpio, const char *label) { - struct gpio_dev_priv *uc_priv; - unsigned int offset; - struct udevice *dev; - char *str; + struct gpio_desc desc; int ret; - ret = gpio_to_device(gpio, &dev, &offset); + ret = gpio_to_device(gpio, &desc); if (ret) return ret; - uc_priv = dev->uclass_priv; - if (uc_priv->name[offset]) - return -EBUSY; - str = strdup(label); - if (!str) - return -ENOMEM; - if (gpio_get_ops(dev)->request) { - ret = gpio_get_ops(dev)->request(dev, offset, label); - if (ret) { - free(str); - return ret; - } - } - uc_priv->name[offset] = str; - - return 0; + return dm_gpio_request(&desc, label); } /** @@ -151,25 +190,11 @@ int gpio_requestf(unsigned gpio, const char *fmt, ...) return gpio_request(gpio, buf); } -/** - * 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) +int _dm_gpio_free(struct udevice *dev, uint offset) { struct gpio_dev_priv *uc_priv; - unsigned int offset; - struct udevice *dev; int ret; - ret = gpio_to_device(gpio, &dev, &offset); - if (ret) - return ret; - uc_priv = dev->uclass_priv; if (!uc_priv->name[offset]) return -ENXIO; @@ -185,15 +210,35 @@ int gpio_free(unsigned gpio) return 0; } -static int check_reserved(struct udevice *dev, unsigned offset, - const char *func) +/** + * 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_dev_priv *uc_priv = dev->uclass_priv; + 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(struct gpio_desc *desc, const char *func) +{ + struct gpio_dev_priv *uc_priv = desc->dev->uclass_priv; - if (!uc_priv->name[offset]) { + if (!uc_priv->name[desc->offset]) { printf("%s: %s: error: gpio %s%d not reserved\n", - dev->name, func, - uc_priv->bank_name ? uc_priv->bank_name : "", offset); + desc->dev->name, func, + uc_priv->bank_name ? uc_priv->bank_name : "", + desc->offset); return -EBUSY; } @@ -210,16 +255,17 @@ static int check_reserved(struct udevice *dev, unsigned offset, */ int gpio_direction_input(unsigned gpio) { - unsigned int offset; - struct udevice *dev; + struct gpio_desc desc; int ret; - ret = gpio_to_device(gpio, &dev, &offset); + ret = gpio_to_device(gpio, &desc); + if (ret) + return ret; + ret = check_reserved(&desc, "dir_input"); if (ret) return ret; - ret = check_reserved(dev, offset, "dir_input"); - return ret ? ret : gpio_get_ops(dev)->direction_input(dev, offset); + return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset); } /** @@ -233,17 +279,81 @@ int gpio_direction_input(unsigned gpio) */ int gpio_direction_output(unsigned gpio, int value) { - unsigned int offset; - struct udevice *dev; + struct gpio_desc desc; + int ret; + + ret = gpio_to_device(gpio, &desc); + if (ret) + return ret; + ret = check_reserved(&desc, "dir_output"); + if (ret) + return ret; + + return gpio_get_ops(desc.dev)->direction_output(desc.dev, + desc.offset, value); +} + +int dm_gpio_get_value(struct gpio_desc *desc) +{ + int value; + int ret; + + ret = check_reserved(desc, "get_value"); + if (ret) + return ret; + + value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset); + + return desc->flags & GPIOD_ACTIVE_LOW ? !value : value; +} + +int dm_gpio_set_value(struct gpio_desc *desc, int value) +{ + int ret; + + ret = check_reserved(desc, "set_value"); + if (ret) + return ret; + + if (desc->flags & GPIOD_ACTIVE_LOW) + value = !value; + gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value); + return 0; +} + +int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags) +{ + struct udevice *dev = desc->dev; + struct dm_gpio_ops *ops = gpio_get_ops(dev); int ret; - ret = gpio_to_device(gpio, &dev, &offset); + ret = check_reserved(desc, "set_dir"); + if (ret) + return ret; + + if (flags & GPIOD_IS_OUT) { + int value = flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0; + + if (flags & GPIOD_ACTIVE_LOW) + value = !value; + ret = ops->direction_output(dev, desc->offset, value); + } else if (flags & GPIOD_IS_IN) { + ret = ops->direction_input(dev, desc->offset); + } if (ret) return ret; - ret = check_reserved(dev, offset, "dir_output"); + /* + * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in + * futures + */ + desc->flags = flags; + + return 0; +} - return ret ? ret : - gpio_get_ops(dev)->direction_output(dev, offset, value); +int dm_gpio_set_dir(struct gpio_desc *desc) +{ + return dm_gpio_set_dir_flags(desc, desc->flags); } /** @@ -257,16 +367,14 @@ int gpio_direction_output(unsigned gpio, int value) */ int gpio_get_value(unsigned gpio) { - unsigned int offset; - struct udevice *dev; int ret; - ret = gpio_to_device(gpio, &dev, &offset); + struct gpio_desc desc; + + ret = gpio_to_device(gpio, &desc); if (ret) return ret; - ret = check_reserved(dev, offset, "get_value"); - - return ret ? ret : gpio_get_ops(dev)->get_value(dev, offset); + return dm_gpio_get_value(&desc); } /** @@ -280,16 +388,13 @@ int gpio_get_value(unsigned gpio) */ int gpio_set_value(unsigned gpio, int value) { - unsigned int offset; - struct udevice *dev; + struct gpio_desc desc; int ret; - ret = gpio_to_device(gpio, &dev, &offset); + ret = gpio_to_device(gpio, &desc); if (ret) return ret; - ret = check_reserved(dev, offset, "set_value"); - - return ret ? ret : gpio_get_ops(dev)->set_value(dev, offset, value); + return dm_gpio_set_value(&desc, value); } const char *gpio_get_bank_info(struct udevice *dev, int *bit_count) @@ -409,6 +514,155 @@ unsigned gpio_get_values_as_int(const int *gpio_num_array) return vector; } +static int _gpio_request_by_name_nodev(const void *blob, int node, + const char *list_name, int index, + struct gpio_desc *desc, int flags, + bool add_index) +{ + struct fdtdec_phandle_args args; + int ret; + + desc->dev = NULL; + desc->offset = 0; + ret = fdtdec_parse_phandle_with_args(blob, node, list_name, + "#gpio-cells", 0, index, &args); + if (ret) { + debug("%s: fdtdec_parse_phandle_with_args failed\n", __func__); + goto err; + } + + ret = uclass_get_device_by_of_offset(UCLASS_GPIO, args.node, + &desc->dev); + if (ret) { + debug("%s: uclass_get_device_by_of_offset 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", + fdt_get_name(blob, node, NULL), + list_name, index); + if (ret) { + debug("%s: dm_gpio_requestf failed\n", __func__); + goto err; + } + ret = dm_gpio_set_dir_flags(desc, flags | desc->flags); + 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__, fdt_get_name(blob, node, NULL), list_name, index, ret); + return ret; +} + +int gpio_request_by_name_nodev(const void *blob, int node, + const char *list_name, int index, + struct gpio_desc *desc, int flags) +{ + return _gpio_request_by_name_nodev(blob, 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) +{ + /* + * 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_by_name_nodev() can be dropped. + */ + return gpio_request_by_name_nodev(gd->fdt_blob, dev->of_offset, + list_name, index, desc, flags); +} + +int gpio_request_list_by_name_nodev(const void *blob, int node, + const char *list_name, + struct gpio_desc *desc, int max_count, + int flags) +{ + int count; + int ret; + + for (count = 0; ; count++) { + if (count >= max_count) { + ret = -ENOSPC; + goto err; + } + ret = _gpio_request_by_name_nodev(blob, 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(gd->fdt_blob, dev->of_offset, + list_name, desc, max_count, + flags); +} + +int gpio_get_list_count(struct udevice *dev, const char *list_name) +{ + int ret; + + ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, + list_name, "#gpio-cells", 0, -1, + NULL); + if (ret) { + debug("%s: Node '%s', property '%s', GPIO count failed: %d\n", + __func__, dev->name, list_name, ret); + } + + return ret; +} + +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) { |