+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
+#include <log.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 <asm/gpio.h>
+#include <dm/device_compat.h>
#include <linux/bug.h>
#include <linux/ctype.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
*
uc_priv = dev_get_uclass_priv(dev);
if (gpio >= uc_priv->gpio_base &&
gpio < uc_priv->gpio_base + uc_priv->gpio_count) {
- desc->dev = dev;
- desc->offset = gpio - uc_priv->gpio_base;
- desc->flags = 0;
+ gpio_desc_init(desc, dev, gpio - uc_priv->gpio_base);
return 0;
}
}
if (!dev)
return ret ? ret : -EINVAL;
- desc->dev = dev;
- desc->offset = offset;
+ gpio_desc_init(desc, dev, offset);
return 0;
}
if (args->args_count < 2)
return 0;
+ desc->flags = 0;
if (args->args[1] & GPIO_ACTIVE_LOW)
- desc->flags = GPIOD_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;
}
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_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gpio_hog_data *plat = dev_get_platdata(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_platdata(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_GET_DRIVER(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,
+ .ofdata_to_platdata = gpio_hog_ofdata_to_platdata,
+ .probe = gpio_hog_probe,
+ .priv_auto_alloc_size = sizeof(struct gpio_hog_priv),
+ .platdata_auto_alloc_size = 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)
{
struct udevice *dev = desc->dev;
static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...)
{
-#if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF)
+#if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
va_list args;
char buf[40];
*/
int gpio_requestf(unsigned gpio, const char *fmt, ...)
{
-#if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_USE_TINY_PRINTF)
+#if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
va_list args;
char buf[40];
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 (gpio_get_ops(dev)->rfree) {
+ ret = gpio_get_ops(dev)->rfree(dev, offset);
if (ret)
return ret;
}
desc.offset, value);
}
-int dm_gpio_get_value(const struct gpio_desc *desc)
+static int _gpio_get_value(const struct gpio_desc *desc)
{
int value;
+
+ value = gpio_get_ops(desc->dev)->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;
- value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset);
-
- return desc->flags & GPIOD_ACTIVE_LOW ? !value : value;
+ return _gpio_get_value(desc);
}
int dm_gpio_set_value(const struct gpio_desc *desc, int value)
if (desc->flags & GPIOD_ACTIVE_LOW)
value = !value;
+
+ /*
+ * 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 gpio_get_ops(desc->dev)->direction_input(desc->dev,
+ desc->offset);
+ else if (desc->flags & GPIOD_OPEN_DRAIN ||
+ desc->flags & GPIOD_OPEN_SOURCE)
+ return gpio_get_ops(desc->dev)->direction_output(desc->dev,
+ desc->offset,
+ value);
+
gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value);
return 0;
}
-int dm_gpio_get_open_drain(struct gpio_desc *desc)
+/* check dir flags invalid configuration */
+static int check_dir_flags(ulong flags)
{
- struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
- int ret;
+ 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;
+}
+
+static 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);
+ 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);
- ret = check_reserved(desc, "get_open_drain");
- if (ret)
return ret;
+ }
- if (ops->set_open_drain)
- return ops->get_open_drain(desc->dev, desc->offset);
- else
- return -ENOSYS;
+ /* GPIOD_ are directly managed by driver in set_dir_flags*/
+ if (ops->set_dir_flags) {
+ ret = ops->set_dir_flags(dev, desc->offset, flags);
+ } else {
+ if (flags & GPIOD_IS_OUT) {
+ ret = ops->direction_output(dev, desc->offset,
+ GPIOD_FLAGS_OUTPUT(flags));
+ } else if (flags & GPIOD_IS_IN) {
+ ret = ops->direction_input(dev, desc->offset);
+ }
+ }
+
+ return ret;
}
-int dm_gpio_set_open_drain(struct gpio_desc *desc, int value)
+int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
{
- struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
int ret;
- ret = check_reserved(desc, "set_open_drain");
+ ret = check_reserved(desc, "set_dir_flags");
if (ret)
return ret;
- if (ops->set_open_drain)
- ret = ops->set_open_drain(desc->dev, desc->offset, value);
- else
- return 0; /* feature not supported -> ignore setting */
+ /* combine the requested flags (for IN/OUT) and the descriptor flags */
+ flags |= desc->flags;
+ ret = _dm_gpio_set_dir_flags(desc, flags);
+
+ /* update the descriptor flags */
+ if (ret)
+ desc->flags = flags;
return ret;
}
-int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
+int dm_gpio_set_dir(struct gpio_desc *desc)
{
- 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;
+ return _dm_gpio_set_dir_flags(desc, desc->flags);
+}
- 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);
- }
+int dm_gpio_get_dir_flags(struct gpio_desc *desc, ulong *flags)
+{
+ struct udevice *dev = desc->dev;
+ int ret, value;
+ struct dm_gpio_ops *ops = gpio_get_ops(dev);
+ ulong dir_flags;
+
+ ret = check_reserved(desc, "get_dir_flags");
if (ret)
return ret;
- /*
- * Update desc->flags here, so that GPIO_ACTIVE_LOW is honoured in
- * futures
- */
- desc->flags = flags;
- return 0;
-}
+ /* GPIOD_ are directly provided by driver except GPIOD_ACTIVE_LOW */
+ if (ops->get_dir_flags) {
+ ret = ops->get_dir_flags(dev, desc->offset, &dir_flags);
+ if (ret)
+ return ret;
-int dm_gpio_set_dir(struct gpio_desc *desc)
-{
- return dm_gpio_set_dir_flags(desc, desc->flags);
+ /* GPIOD_ACTIVE_LOW is saved in desc->flags */
+ value = dir_flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0;
+ if (desc->flags & GPIOD_ACTIVE_LOW)
+ value = !value;
+ dir_flags &= ~(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE);
+ dir_flags |= (desc->flags & GPIOD_ACTIVE_LOW);
+ if (value)
+ dir_flags |= GPIOD_IS_OUT_ACTIVE;
+ } else {
+ dir_flags = desc->flags;
+ /* only GPIOD_IS_OUT_ACTIVE is provided by uclass */
+ dir_flags &= ~GPIOD_IS_OUT_ACTIVE;
+ if ((desc->flags & GPIOD_IS_OUT) && _gpio_get_value(desc))
+ dir_flags |= GPIOD_IS_OUT_ACTIVE;
+ }
+ *flags = dir_flags;
+
+ return 0;
}
/**
"func",
};
-int get_function(struct udevice *dev, int offset, bool skip_unused,
- const char **namep)
+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);
struct dm_gpio_ops *ops = gpio_get_ops(dev);
return vector;
}
-static int gpio_request_tail(int ret, ofnode node,
+/**
+ * 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 gpio_desc *desc, int flags,
+ bool add_index, struct udevice *gpio_dev)
{
- desc->dev = NULL;
- desc->offset = 0;
- desc->flags = 0;
+ gpio_desc_init(desc, gpio_dev, 0);
if (ret)
goto err;
- ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
- &desc->dev);
- if (ret) {
- debug("%s: uclass_get_device_by_of_offset failed\n", __func__);
- 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) {
goto err;
}
ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s",
- ofnode_get_name(node),
- list_name, index);
+ nodename, 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);
+ ret = dm_gpio_set_dir_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__, ofnode_get_name(node), list_name, index, ret);
+ __func__, nodename, list_name, index, ret);
return ret;
}
ret = ofnode_parse_phandle_with_args(node, list_name, "#gpio-cells", 0,
index, &args);
- return gpio_request_tail(ret, node, &args, list_name, index, desc,
- flags, add_index);
+ 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)
{
struct ofnode_phandle_args args;
+ ofnode node;
int ret;
ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0,
index, &args);
-
- return gpio_request_tail(ret, dev_ofnode(dev), &args, list_name,
- index, desc, flags, index > 0);
+ 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,
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 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_dir_flags)
+ ops->set_dir_flags += gd->reloc_off;
+ if (ops->get_dir_flags)
+ ops->get_dir_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_alloc_size = sizeof(struct gpio_dev_priv),
};
projects / oweals / u-boot.git / blobdiff