#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;
for (ret = uclass_first_device(UCLASS_GPIO, &dev);
dev;
ret = uclass_next_device(&dev)) {
- uc_priv = dev->uclass_priv;
+ uc_priv = dev_get_uclass_priv(dev);
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,
- unsigned int *offsetp, unsigned int *gpiop)
+int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
{
- struct gpio_dev_priv *uc_priv;
+ struct gpio_dev_priv *uc_priv = NULL;
struct udevice *dev;
+ ulong offset;
+ int numeric;
int ret;
- if (devp)
- *devp = NULL;
+ numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1;
for (ret = uclass_first_device(UCLASS_GPIO, &dev);
dev;
ret = uclass_next_device(&dev)) {
- ulong offset;
int len;
- uc_priv = dev->uclass_priv;
+ 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 >= 0 && 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))
- continue;
- if (devp)
- *devp = dev;
- if (offsetp)
- *offsetp = offset;
- if (gpiop)
- *gpiop = uc_priv->gpio_base + offset;
- return 0;
+ if (!strict_strtoul(name + len, 10, &offset))
+ break;
+ }
+ }
+
+ if (!dev)
+ return ret ? ret : -EINVAL;
+
+ desc->dev = dev;
+ desc->offset = 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;
+}
+
+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;
+}
+
+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_get_uclass_priv(dev);
+ 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 ret ? ret : -EINVAL;
+ 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: 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)
{
- 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;
- if (!gpio_get_ops(dev)->request)
- return 0;
+ return dm_gpio_request(&desc, label);
+}
- return gpio_get_ops(dev)->request(dev, offset, 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, ...)
+{
+ va_list args;
+ char buf[40];
+
+ va_start(args, fmt);
+ vscnprintf(buf, sizeof(buf), fmt, args);
+ va_end(args);
+ return gpio_request(gpio, buf);
+}
+
+int _dm_gpio_free(struct udevice *dev, uint offset)
+{
+ struct gpio_dev_priv *uc_priv;
+ int ret;
+
+ uc_priv = dev_get_uclass_priv(dev);
+ if (!uc_priv->name[offset])
+ return -ENXIO;
+ if (gpio_get_ops(dev)->free) {
+ ret = gpio_get_ops(dev)->free(dev, offset);
+ if (ret)
+ return ret;
+ }
+
+ free(uc_priv->name[offset]);
+ uc_priv->name[offset] = NULL;
+
+ return 0;
}
/**
*/
int gpio_free(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;
- if (!gpio_get_ops(dev)->free)
- return 0;
- return gpio_get_ops(dev)->free(dev, offset);
+ 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;
+
+ 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;
}
/**
*/
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;
- return 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, &dev, &offset);
+ ret = gpio_to_device(gpio, &desc);
+ if (ret)
+ return ret;
+ ret = check_reserved(&desc, "dir_output");
if (ret)
return ret;
- return gpio_get_ops(dev)->direction_output(dev, offset, value);
+ 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 = 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;
-
- return 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;
-
- return 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)
struct gpio_dev_priv *priv;
/* Must be called on an active device */
- priv = dev->uclass_priv;
+ 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",
+};
+
+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);
+ 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)
+{
+ 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;
+}
+
+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;
+}
+
+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 < max_count; count++) {
+ 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(void)
+static int gpio_renumber(struct udevice *removed_dev)
{
struct gpio_dev_priv *uc_priv;
struct udevice *dev;
/* Ensure that we have a base for each bank */
base = 0;
uclass_foreach_dev(dev, uc) {
- if (device_active(dev)) {
- uc_priv = dev->uclass_priv;
+ 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(struct gpio_desc *desc)
+{
+ struct udevice *dev = desc->dev;
+ struct gpio_dev_priv *uc_priv;
+
+ if (!dev)
+ return -1;
+ uc_priv = dev->uclass_priv;
+
+ return uc_priv->gpio_base + desc->offset;
+}
+
static int gpio_post_probe(struct udevice *dev)
{
- return gpio_renumber();
+ 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)
{
- return gpio_renumber();
+ 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);
}
UCLASS_DRIVER(gpio) = {
.id = UCLASS_GPIO,
.name = "gpio",
+ .flags = DM_UC_FLAG_SEQ_ALIAS,
.post_probe = gpio_post_probe,
.pre_remove = gpio_pre_remove,
.per_device_auto_alloc_size = sizeof(struct gpio_dev_priv),
projects / karo-tx-uboot.git / blobdiff