#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;
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,
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
*/
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);
}
/**
return ret;
}
-/**
- * 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;
return ret;
}
-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_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 = dev->uclass_priv;
+ 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;
}
*/
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);
}
/**
*/
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 = gpio_to_device(gpio, &dev, &offset);
+ ret = check_reserved(desc, "set_value");
if (ret)
return ret;
- ret = check_reserved(dev, offset, "dir_output");
- return ret ? ret :
- gpio_get_ops(dev)->direction_output(dev, offset, value);
+ 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 = 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;
+ /*
+ * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in
+ * futures
+ */
+ desc->flags = flags;
+
+ return 0;
+}
+
+int dm_gpio_set_dir(struct gpio_desc *desc)
+{
+ return dm_gpio_set_dir_flags(desc, desc->flags);
}
/**
*/
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);
}
/**
*/
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)
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)
{
projects / karo-tx-uboot.git / blobdiff