Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Reset Controller framework
 *
 * Copyright 2013 Philipp Zabel, Pengutronix
 */
#include <linux/atomic.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/reset.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
 
static DEFINE_MUTEX(reset_list_mutex);
static LIST_HEAD(reset_controller_list);
 
static DEFINE_MUTEX(reset_lookup_mutex);
static LIST_HEAD(reset_lookup_list);
 
/**
 * struct reset_control - a reset control
 * @rcdev: a pointer to the reset controller device
 *         this reset control belongs to
 * @list: list entry for the rcdev's reset controller list
 * @id: ID of the reset controller in the reset
 *      controller device
 * @refcnt: Number of gets of this reset_control
 * @acquired: Only one reset_control may be acquired for a given rcdev and id.
 * @shared: Is this a shared (1), or an exclusive (0) reset_control?
 * @array: Is this an array of reset controls (1)?
 * @deassert_count: Number of times this reset line has been deasserted
 * @triggered_count: Number of times this reset line has been reset. Currently
 *                   only used for shared resets, which means that the value
 *                   will be either 0 or 1.
 */
struct reset_control {
<------>struct reset_controller_dev *rcdev;
<------>struct list_head list;
<------>unsigned int id;
<------>struct kref refcnt;
<------>bool acquired;
<------>bool shared;
<------>bool array;
<------>atomic_t deassert_count;
<------>atomic_t triggered_count;
};
 
/**
 * struct reset_control_array - an array of reset controls
 * @base: reset control for compatibility with reset control API functions
 * @num_rstcs: number of reset controls
 * @rstc: array of reset controls
 */
struct reset_control_array {
<------>struct reset_control base;
<------>unsigned int num_rstcs;
<------>struct reset_control *rstc[];
};
 
static const char *rcdev_name(struct reset_controller_dev *rcdev)
{
<------>if (rcdev->dev)
<------><------>return dev_name(rcdev->dev);
 
<------>if (rcdev->of_node)
<------><------>return rcdev->of_node->full_name;
 
<------>return NULL;
}
 
/**
 * of_reset_simple_xlate - translate reset_spec to the reset line number
 * @rcdev: a pointer to the reset controller device
 * @reset_spec: reset line specifier as found in the device tree
 *
 * This static translation function is used by default if of_xlate in
 * :c:type:`reset_controller_dev` is not set. It is useful for all reset
 * controllers with 1:1 mapping, where reset lines can be indexed by number
 * without gaps.
 */
static int of_reset_simple_xlate(struct reset_controller_dev *rcdev,
<------><------><------>  const struct of_phandle_args *reset_spec)
{
<------>if (reset_spec->args[0] >= rcdev->nr_resets)
<------><------>return -EINVAL;
 
<------>return reset_spec->args[0];
}
 
/**
 * reset_controller_register - register a reset controller device
 * @rcdev: a pointer to the initialized reset controller device
 */
int reset_controller_register(struct reset_controller_dev *rcdev)
{
<------>if (!rcdev->of_xlate) {
<------><------>rcdev->of_reset_n_cells = 1;
<------><------>rcdev->of_xlate = of_reset_simple_xlate;
<------>}
 
<------>INIT_LIST_HEAD(&rcdev->reset_control_head);
 
<------>mutex_lock(&reset_list_mutex);
<------>list_add(&rcdev->list, &reset_controller_list);
<------>mutex_unlock(&reset_list_mutex);
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(reset_controller_register);
 
/**
 * reset_controller_unregister - unregister a reset controller device
 * @rcdev: a pointer to the reset controller device
 */
void reset_controller_unregister(struct reset_controller_dev *rcdev)
{
<------>mutex_lock(&reset_list_mutex);
<------>list_del(&rcdev->list);
<------>mutex_unlock(&reset_list_mutex);
}
EXPORT_SYMBOL_GPL(reset_controller_unregister);
 
static void devm_reset_controller_release(struct device *dev, void *res)
{
<------>reset_controller_unregister(*(struct reset_controller_dev **)res);
}
 
/**
 * devm_reset_controller_register - resource managed reset_controller_register()
 * @dev: device that is registering this reset controller
 * @rcdev: a pointer to the initialized reset controller device
 *
 * Managed reset_controller_register(). For reset controllers registered by
 * this function, reset_controller_unregister() is automatically called on
 * driver detach. See reset_controller_register() for more information.
 */
int devm_reset_controller_register(struct device *dev,
<------><------><------><------>   struct reset_controller_dev *rcdev)
{
<------>struct reset_controller_dev **rcdevp;
<------>int ret;
 
<------>rcdevp = devres_alloc(devm_reset_controller_release, sizeof(*rcdevp),
<------><------><------>      GFP_KERNEL);
<------>if (!rcdevp)
<------><------>return -ENOMEM;
 
<------>ret = reset_controller_register(rcdev);
<------>if (ret) {
<------><------>devres_free(rcdevp);
<------><------>return ret;
<------>}
 
<------>*rcdevp = rcdev;
<------>devres_add(dev, rcdevp);
 
<------>return ret;
}
EXPORT_SYMBOL_GPL(devm_reset_controller_register);
 
/**
 * reset_controller_add_lookup - register a set of lookup entries
 * @lookup: array of reset lookup entries
 * @num_entries: number of entries in the lookup array
 */
void reset_controller_add_lookup(struct reset_control_lookup *lookup,
<------><------><------><------> unsigned int num_entries)
{
<------>struct reset_control_lookup *entry;
<------>unsigned int i;
 
<------>mutex_lock(&reset_lookup_mutex);
<------>for (i = 0; i < num_entries; i++) {
<------><------>entry = &lookup[i];
 
<------><------>if (!entry->dev_id || !entry->provider) {
<------><------><------>pr_warn("%s(): reset lookup entry badly specified, skipping\n",
<------><------><------><------>__func__);
<------><------><------>continue;
<------><------>}
 
<------><------>list_add_tail(&entry->list, &reset_lookup_list);
<------>}
<------>mutex_unlock(&reset_lookup_mutex);
}
EXPORT_SYMBOL_GPL(reset_controller_add_lookup);
 
static inline struct reset_control_array *
rstc_to_array(struct reset_control *rstc) {
<------>return container_of(rstc, struct reset_control_array, base);
}
 
static int reset_control_array_reset(struct reset_control_array *resets)
{
<------>int ret, i;
 
<------>for (i = 0; i < resets->num_rstcs; i++) {
<------><------>ret = reset_control_reset(resets->rstc[i]);
<------><------>if (ret)
<------><------><------>return ret;
<------>}
 
<------>return 0;
}
 
static int reset_control_array_assert(struct reset_control_array *resets)
{
<------>int ret, i;
 
<------>for (i = 0; i < resets->num_rstcs; i++) {
<------><------>ret = reset_control_assert(resets->rstc[i]);
<------><------>if (ret)
<------><------><------>goto err;
<------>}
 
<------>return 0;
 
err:
<------>while (i--)
<------><------>reset_control_deassert(resets->rstc[i]);
<------>return ret;
}
 
static int reset_control_array_deassert(struct reset_control_array *resets)
{
<------>int ret, i;
 
<------>for (i = 0; i < resets->num_rstcs; i++) {
<------><------>ret = reset_control_deassert(resets->rstc[i]);
<------><------>if (ret)
<------><------><------>goto err;
<------>}
 
<------>return 0;
 
err:
<------>while (i--)
<------><------>reset_control_assert(resets->rstc[i]);
<------>return ret;
}
 
static int reset_control_array_acquire(struct reset_control_array *resets)
{
<------>unsigned int i;
<------>int err;
 
<------>for (i = 0; i < resets->num_rstcs; i++) {
<------><------>err = reset_control_acquire(resets->rstc[i]);
<------><------>if (err < 0)
<------><------><------>goto release;
<------>}
 
<------>return 0;
 
release:
<------>while (i--)
<------><------>reset_control_release(resets->rstc[i]);
 
<------>return err;
}
 
static void reset_control_array_release(struct reset_control_array *resets)
{
<------>unsigned int i;
 
<------>for (i = 0; i < resets->num_rstcs; i++)
<------><------>reset_control_release(resets->rstc[i]);
}
 
static inline bool reset_control_is_array(struct reset_control *rstc)
{
<------>return rstc->array;
}
 
/**
 * reset_control_reset - reset the controlled device
 * @rstc: reset controller
 *
 * On a shared reset line the actual reset pulse is only triggered once for the
 * lifetime of the reset_control instance: for all but the first caller this is
 * a no-op.
 * Consumers must not use reset_control_(de)assert on shared reset lines when
 * reset_control_reset has been used.
 *
 * If rstc is NULL it is an optional reset and the function will just
 * return 0.
 */
int reset_control_reset(struct reset_control *rstc)
{
<------>int ret;
 
<------>if (!rstc)
<------><------>return 0;
 
<------>if (WARN_ON(IS_ERR(rstc)))
<------><------>return -EINVAL;
 
<------>if (reset_control_is_array(rstc))
<------><------>return reset_control_array_reset(rstc_to_array(rstc));
 
<------>if (!rstc->rcdev->ops->reset)
<------><------>return -ENOTSUPP;
 
<------>if (rstc->shared) {
<------><------>if (WARN_ON(atomic_read(&rstc->deassert_count) != 0))
<------><------><------>return -EINVAL;
 
<------><------>if (atomic_inc_return(&rstc->triggered_count) != 1)
<------><------><------>return 0;
<------>} else {
<------><------>if (!rstc->acquired)
<------><------><------>return -EPERM;
<------>}
 
<------>ret = rstc->rcdev->ops->reset(rstc->rcdev, rstc->id);
<------>if (rstc->shared && ret)
<------><------>atomic_dec(&rstc->triggered_count);
 
<------>return ret;
}
EXPORT_SYMBOL_GPL(reset_control_reset);
 
/**
 * reset_control_assert - asserts the reset line
 * @rstc: reset controller
 *
 * Calling this on an exclusive reset controller guarantees that the reset
 * will be asserted. When called on a shared reset controller the line may
 * still be deasserted, as long as other users keep it so.
 *
 * For shared reset controls a driver cannot expect the hw's registers and
 * internal state to be reset, but must be prepared for this to happen.
 * Consumers must not use reset_control_reset on shared reset lines when
 * reset_control_(de)assert has been used.
 *
 * If rstc is NULL it is an optional reset and the function will just
 * return 0.
 */
int reset_control_assert(struct reset_control *rstc)
{
<------>if (!rstc)
<------><------>return 0;
 
<------>if (WARN_ON(IS_ERR(rstc)))
<------><------>return -EINVAL;
 
<------>if (reset_control_is_array(rstc))
<------><------>return reset_control_array_assert(rstc_to_array(rstc));
 
<------>if (rstc->shared) {
<------><------>if (WARN_ON(atomic_read(&rstc->triggered_count) != 0))
<------><------><------>return -EINVAL;
 
<------><------>if (WARN_ON(atomic_read(&rstc->deassert_count) == 0))
<------><------><------>return -EINVAL;
 
<------><------>if (atomic_dec_return(&rstc->deassert_count) != 0)
<------><------><------>return 0;
 
<------><------>/*
<------><------> * Shared reset controls allow the reset line to be in any state
<------><------> * after this call, so doing nothing is a valid option.
<------><------> */
<------><------>if (!rstc->rcdev->ops->assert)
<------><------><------>return 0;
<------>} else {
<------><------>/*
<------><------> * If the reset controller does not implement .assert(), there
<------><------> * is no way to guarantee that the reset line is asserted after
<------><------> * this call.
<------><------> */
<------><------>if (!rstc->rcdev->ops->assert)
<------><------><------>return -ENOTSUPP;
 
<------><------>if (!rstc->acquired) {
<------><------><------>WARN(1, "reset %s (ID: %u) is not acquired\n",
<------><------><------>     rcdev_name(rstc->rcdev), rstc->id);
<------><------><------>return -EPERM;
<------><------>}
<------>}
 
<------>return rstc->rcdev->ops->assert(rstc->rcdev, rstc->id);
}
EXPORT_SYMBOL_GPL(reset_control_assert);
 
/**
 * reset_control_deassert - deasserts the reset line
 * @rstc: reset controller
 *
 * After calling this function, the reset is guaranteed to be deasserted.
 * Consumers must not use reset_control_reset on shared reset lines when
 * reset_control_(de)assert has been used.
 *
 * If rstc is NULL it is an optional reset and the function will just
 * return 0.
 */
int reset_control_deassert(struct reset_control *rstc)
{
<------>if (!rstc)
<------><------>return 0;
 
<------>if (WARN_ON(IS_ERR(rstc)))
<------><------>return -EINVAL;
 
<------>if (reset_control_is_array(rstc))
<------><------>return reset_control_array_deassert(rstc_to_array(rstc));
 
<------>if (rstc->shared) {
<------><------>if (WARN_ON(atomic_read(&rstc->triggered_count) != 0))
<------><------><------>return -EINVAL;
 
<------><------>if (atomic_inc_return(&rstc->deassert_count) != 1)
<------><------><------>return 0;
<------>} else {
<------><------>if (!rstc->acquired) {
<------><------><------>WARN(1, "reset %s (ID: %u) is not acquired\n",
<------><------><------>     rcdev_name(rstc->rcdev), rstc->id);
<------><------><------>return -EPERM;
<------><------>}
<------>}
 
<------>/*
<------> * If the reset controller does not implement .deassert(), we assume
<------> * that it handles self-deasserting reset lines via .reset(). In that
<------> * case, the reset lines are deasserted by default. If that is not the
<------> * case, the reset controller driver should implement .deassert() and
<------> * return -ENOTSUPP.
<------> */
<------>if (!rstc->rcdev->ops->deassert)
<------><------>return 0;
 
<------>return rstc->rcdev->ops->deassert(rstc->rcdev, rstc->id);
}
EXPORT_SYMBOL_GPL(reset_control_deassert);
 
/**
 * reset_control_status - returns a negative errno if not supported, a
 * positive value if the reset line is asserted, or zero if the reset
 * line is not asserted or if the desc is NULL (optional reset).
 * @rstc: reset controller
 */
int reset_control_status(struct reset_control *rstc)
{
<------>if (!rstc)
<------><------>return 0;
 
<------>if (WARN_ON(IS_ERR(rstc)) || reset_control_is_array(rstc))
<------><------>return -EINVAL;
 
<------>if (rstc->rcdev->ops->status)
<------><------>return rstc->rcdev->ops->status(rstc->rcdev, rstc->id);
 
<------>return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(reset_control_status);
 
/**
 * reset_control_acquire() - acquires a reset control for exclusive use
 * @rstc: reset control
 *
 * This is used to explicitly acquire a reset control for exclusive use. Note
 * that exclusive resets are requested as acquired by default. In order for a
 * second consumer to be able to control the reset, the first consumer has to
 * release it first. Typically the easiest way to achieve this is to call the
 * reset_control_get_exclusive_released() to obtain an instance of the reset
 * control. Such reset controls are not acquired by default.
 *
 * Consumers implementing shared access to an exclusive reset need to follow
 * a specific protocol in order to work together. Before consumers can change
 * a reset they must acquire exclusive access using reset_control_acquire().
 * After they are done operating the reset, they must release exclusive access
 * with a call to reset_control_release(). Consumers are not granted exclusive
 * access to the reset as long as another consumer hasn't released a reset.
 *
 * See also: reset_control_release()
 */
int reset_control_acquire(struct reset_control *rstc)
{
<------>struct reset_control *rc;
 
<------>if (!rstc)
<------><------>return 0;
 
<------>if (WARN_ON(IS_ERR(rstc)))
<------><------>return -EINVAL;
 
<------>if (reset_control_is_array(rstc))
<------><------>return reset_control_array_acquire(rstc_to_array(rstc));
 
<------>mutex_lock(&reset_list_mutex);
 
<------>if (rstc->acquired) {
<------><------>mutex_unlock(&reset_list_mutex);
<------><------>return 0;
<------>}
 
<------>list_for_each_entry(rc, &rstc->rcdev->reset_control_head, list) {
<------><------>if (rstc != rc && rstc->id == rc->id) {
<------><------><------>if (rc->acquired) {
<------><------><------><------>mutex_unlock(&reset_list_mutex);
<------><------><------><------>return -EBUSY;
<------><------><------>}
<------><------>}
<------>}
 
<------>rstc->acquired = true;
 
<------>mutex_unlock(&reset_list_mutex);
<------>return 0;
}
EXPORT_SYMBOL_GPL(reset_control_acquire);
 
/**
 * reset_control_release() - releases exclusive access to a reset control
 * @rstc: reset control
 *
 * Releases exclusive access right to a reset control previously obtained by a
 * call to reset_control_acquire(). Until a consumer calls this function, no
 * other consumers will be granted exclusive access.
 *
 * See also: reset_control_acquire()
 */
void reset_control_release(struct reset_control *rstc)
{
<------>if (!rstc || WARN_ON(IS_ERR(rstc)))
<------><------>return;
 
<------>if (reset_control_is_array(rstc))
<------><------>reset_control_array_release(rstc_to_array(rstc));
<------>else
<------><------>rstc->acquired = false;
}
EXPORT_SYMBOL_GPL(reset_control_release);
 
static struct reset_control *__reset_control_get_internal(
<------><------><------><------>struct reset_controller_dev *rcdev,
<------><------><------><------>unsigned int index, bool shared, bool acquired)
{
<------>struct reset_control *rstc;
 
<------>lockdep_assert_held(&reset_list_mutex);
 
<------>list_for_each_entry(rstc, &rcdev->reset_control_head, list) {
<------><------>if (rstc->id == index) {
<------><------><------>/*
<------><------><------> * Allow creating a secondary exclusive reset_control
<------><------><------> * that is initially not acquired for an already
<------><------><------> * controlled reset line.
<------><------><------> */
<------><------><------>if (!rstc->shared && !shared && !acquired)
<------><------><------><------>break;
 
<------><------><------>if (WARN_ON(!rstc->shared || !shared))
<------><------><------><------>return ERR_PTR(-EBUSY);
 
<------><------><------>kref_get(&rstc->refcnt);
<------><------><------>return rstc;
<------><------>}
<------>}
 
<------>rstc = kzalloc(sizeof(*rstc), GFP_KERNEL);
<------>if (!rstc)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>if (!try_module_get(rcdev->owner)) {
<------><------>kfree(rstc);
<------><------>return ERR_PTR(-ENODEV);
<------>}
 
<------>rstc->rcdev = rcdev;
<------>list_add(&rstc->list, &rcdev->reset_control_head);
<------>rstc->id = index;
<------>kref_init(&rstc->refcnt);
<------>rstc->acquired = acquired;
<------>rstc->shared = shared;
 
<------>return rstc;
}
 
static void __reset_control_release(struct kref *kref)
{
<------>struct reset_control *rstc = container_of(kref, struct reset_control,
<------><------><------><------><------><------>  refcnt);
 
<------>lockdep_assert_held(&reset_list_mutex);
 
<------>module_put(rstc->rcdev->owner);
 
<------>list_del(&rstc->list);
<------>kfree(rstc);
}
 
static void __reset_control_put_internal(struct reset_control *rstc)
{
<------>lockdep_assert_held(&reset_list_mutex);
 
<------>kref_put(&rstc->refcnt, __reset_control_release);
}
 
struct reset_control *__of_reset_control_get(struct device_node *node,
<------><------><------><------>     const char *id, int index, bool shared,
<------><------><------><------>     bool optional, bool acquired)
{
<------>struct reset_control *rstc;
<------>struct reset_controller_dev *r, *rcdev;
<------>struct of_phandle_args args;
<------>int rstc_id;
<------>int ret;
 
<------>if (!node)
<------><------>return ERR_PTR(-EINVAL);
 
<------>if (id) {
<------><------>index = of_property_match_string(node,
<------><------><------><------><------><------> "reset-names", id);
<------><------>if (index == -EILSEQ)
<------><------><------>return ERR_PTR(index);
<------><------>if (index < 0)
<------><------><------>return optional ? NULL : ERR_PTR(-ENOENT);
<------>}
 
<------>ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
<------><------><------><------><------> index, &args);
<------>if (ret == -EINVAL)
<------><------>return ERR_PTR(ret);
<------>if (ret)
<------><------>return optional ? NULL : ERR_PTR(ret);
 
<------>mutex_lock(&reset_list_mutex);
<------>rcdev = NULL;
<------>list_for_each_entry(r, &reset_controller_list, list) {
<------><------>if (args.np == r->of_node) {
<------><------><------>rcdev = r;
<------><------><------>break;
<------><------>}
<------>}
 
<------>if (!rcdev) {
<------><------>rstc = ERR_PTR(-EPROBE_DEFER);
<------><------>goto out;
<------>}
 
<------>if (WARN_ON(args.args_count != rcdev->of_reset_n_cells)) {
<------><------>rstc = ERR_PTR(-EINVAL);
<------><------>goto out;
<------>}
 
<------>rstc_id = rcdev->of_xlate(rcdev, &args);
<------>if (rstc_id < 0) {
<------><------>rstc = ERR_PTR(rstc_id);
<------><------>goto out;
<------>}
 
<------>/* reset_list_mutex also protects the rcdev's reset_control list */
<------>rstc = __reset_control_get_internal(rcdev, rstc_id, shared, acquired);
 
out:
<------>mutex_unlock(&reset_list_mutex);
<------>of_node_put(args.np);
 
<------>return rstc;
}
EXPORT_SYMBOL_GPL(__of_reset_control_get);
 
static struct reset_controller_dev *
__reset_controller_by_name(const char *name)
{
<------>struct reset_controller_dev *rcdev;
 
<------>lockdep_assert_held(&reset_list_mutex);
 
<------>list_for_each_entry(rcdev, &reset_controller_list, list) {
<------><------>if (!rcdev->dev)
<------><------><------>continue;
 
<------><------>if (!strcmp(name, dev_name(rcdev->dev)))
<------><------><------>return rcdev;
<------>}
 
<------>return NULL;
}
 
static struct reset_control *
__reset_control_get_from_lookup(struct device *dev, const char *con_id,
<------><------><------><------>bool shared, bool optional, bool acquired)
{
<------>const struct reset_control_lookup *lookup;
<------>struct reset_controller_dev *rcdev;
<------>const char *dev_id = dev_name(dev);
<------>struct reset_control *rstc = NULL;
 
<------>mutex_lock(&reset_lookup_mutex);
 
<------>list_for_each_entry(lookup, &reset_lookup_list, list) {
<------><------>if (strcmp(lookup->dev_id, dev_id))
<------><------><------>continue;
 
<------><------>if ((!con_id && !lookup->con_id) ||
<------><------>    ((con_id && lookup->con_id) &&
<------><------>     !strcmp(con_id, lookup->con_id))) {
<------><------><------>mutex_lock(&reset_list_mutex);
<------><------><------>rcdev = __reset_controller_by_name(lookup->provider);
<------><------><------>if (!rcdev) {
<------><------><------><------>mutex_unlock(&reset_list_mutex);
<------><------><------><------>mutex_unlock(&reset_lookup_mutex);
<------><------><------><------>/* Reset provider may not be ready yet. */
<------><------><------><------>return ERR_PTR(-EPROBE_DEFER);
<------><------><------>}
 
<------><------><------>rstc = __reset_control_get_internal(rcdev,
<------><------><------><------><------><------><------>    lookup->index,
<------><------><------><------><------><------><------>    shared, acquired);
<------><------><------>mutex_unlock(&reset_list_mutex);
<------><------><------>break;
<------><------>}
<------>}
 
<------>mutex_unlock(&reset_lookup_mutex);
 
<------>if (!rstc)
<------><------>return optional ? NULL : ERR_PTR(-ENOENT);
 
<------>return rstc;
}
 
struct reset_control *__reset_control_get(struct device *dev, const char *id,
<------><------><------><------><------>  int index, bool shared, bool optional,
<------><------><------><------><------>  bool acquired)
{
<------>if (WARN_ON(shared && acquired))
<------><------>return ERR_PTR(-EINVAL);
 
<------>if (dev->of_node)
<------><------>return __of_reset_control_get(dev->of_node, id, index, shared,
<------><------><------><------><------>      optional, acquired);
 
<------>return __reset_control_get_from_lookup(dev, id, shared, optional,
<------><------><------><------><------>       acquired);
}
EXPORT_SYMBOL_GPL(__reset_control_get);
 
static void reset_control_array_put(struct reset_control_array *resets)
{
<------>int i;
 
<------>mutex_lock(&reset_list_mutex);
<------>for (i = 0; i < resets->num_rstcs; i++)
<------><------>__reset_control_put_internal(resets->rstc[i]);
<------>mutex_unlock(&reset_list_mutex);
<------>kfree(resets);
}
 
/**
 * reset_control_put - free the reset controller
 * @rstc: reset controller
 */
void reset_control_put(struct reset_control *rstc)
{
<------>if (IS_ERR_OR_NULL(rstc))
<------><------>return;
 
<------>if (reset_control_is_array(rstc)) {
<------><------>reset_control_array_put(rstc_to_array(rstc));
<------><------>return;
<------>}
 
<------>mutex_lock(&reset_list_mutex);
<------>__reset_control_put_internal(rstc);
<------>mutex_unlock(&reset_list_mutex);
}
EXPORT_SYMBOL_GPL(reset_control_put);
 
static void devm_reset_control_release(struct device *dev, void *res)
{
<------>reset_control_put(*(struct reset_control **)res);
}
 
struct reset_control *__devm_reset_control_get(struct device *dev,
<------><------><------><------>     const char *id, int index, bool shared,
<------><------><------><------>     bool optional, bool acquired)
{
<------>struct reset_control **ptr, *rstc;
 
<------>ptr = devres_alloc(devm_reset_control_release, sizeof(*ptr),
<------><------><------>   GFP_KERNEL);
<------>if (!ptr)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>rstc = __reset_control_get(dev, id, index, shared, optional, acquired);
<------>if (IS_ERR_OR_NULL(rstc)) {
<------><------>devres_free(ptr);
<------><------>return rstc;
<------>}
 
<------>*ptr = rstc;
<------>devres_add(dev, ptr);
 
<------>return rstc;
}
EXPORT_SYMBOL_GPL(__devm_reset_control_get);
 
/**
 * device_reset - find reset controller associated with the device
 *                and perform reset
 * @dev: device to be reset by the controller
 * @optional: whether it is optional to reset the device
 *
 * Convenience wrapper for __reset_control_get() and reset_control_reset().
 * This is useful for the common case of devices with single, dedicated reset
 * lines.
 */
int __device_reset(struct device *dev, bool optional)
{
<------>struct reset_control *rstc;
<------>int ret;
 
<------>rstc = __reset_control_get(dev, NULL, 0, 0, optional, true);
<------>if (IS_ERR(rstc))
<------><------>return PTR_ERR(rstc);
 
<------>ret = reset_control_reset(rstc);
 
<------>reset_control_put(rstc);
 
<------>return ret;
}
EXPORT_SYMBOL_GPL(__device_reset);
 
/*
 * APIs to manage an array of reset controls.
 */
 
/**
 * of_reset_control_get_count - Count number of resets available with a device
 *
 * @node: device node that contains 'resets'.
 *
 * Returns positive reset count on success, or error number on failure and
 * on count being zero.
 */
static int of_reset_control_get_count(struct device_node *node)
{
<------>int count;
 
<------>if (!node)
<------><------>return -EINVAL;
 
<------>count = of_count_phandle_with_args(node, "resets", "#reset-cells");
<------>if (count == 0)
<------><------>count = -ENOENT;
 
<------>return count;
}
 
/**
 * of_reset_control_array_get - Get a list of reset controls using
 *				device node.
 *
 * @np: device node for the device that requests the reset controls array
 * @shared: whether reset controls are shared or not
 * @optional: whether it is optional to get the reset controls
 * @acquired: only one reset control may be acquired for a given controller
 *            and ID
 *
 * Returns pointer to allocated reset_control on success or error on failure
 */
struct reset_control *
of_reset_control_array_get(struct device_node *np, bool shared, bool optional,
<------><------><------>   bool acquired)
{
<------>struct reset_control_array *resets;
<------>struct reset_control *rstc;
<------>int num, i;
 
<------>num = of_reset_control_get_count(np);
<------>if (num < 0)
<------><------>return optional ? NULL : ERR_PTR(num);
 
<------>resets = kzalloc(struct_size(resets, rstc, num), GFP_KERNEL);
<------>if (!resets)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>for (i = 0; i < num; i++) {
<------><------>rstc = __of_reset_control_get(np, NULL, i, shared, optional,
<------><------><------><------><------>      acquired);
<------><------>if (IS_ERR(rstc))
<------><------><------>goto err_rst;
<------><------>resets->rstc[i] = rstc;
<------>}
<------>resets->num_rstcs = num;
<------>resets->base.array = true;
 
<------>return &resets->base;
 
err_rst:
<------>mutex_lock(&reset_list_mutex);
<------>while (--i >= 0)
<------><------>__reset_control_put_internal(resets->rstc[i]);
<------>mutex_unlock(&reset_list_mutex);
 
<------>kfree(resets);
 
<------>return rstc;
}
EXPORT_SYMBOL_GPL(of_reset_control_array_get);
 
/**
 * devm_reset_control_array_get - Resource managed reset control array get
 *
 * @dev: device that requests the list of reset controls
 * @shared: whether reset controls are shared or not
 * @optional: whether it is optional to get the reset controls
 *
 * The reset control array APIs are intended for a list of resets
 * that just have to be asserted or deasserted, without any
 * requirements on the order.
 *
 * Returns pointer to allocated reset_control on success or error on failure
 */
struct reset_control *
devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
{
<------>struct reset_control **ptr, *rstc;
 
<------>ptr = devres_alloc(devm_reset_control_release, sizeof(*ptr),
<------><------><------>   GFP_KERNEL);
<------>if (!ptr)
<------><------>return ERR_PTR(-ENOMEM);
 
<------>rstc = of_reset_control_array_get(dev->of_node, shared, optional, true);
<------>if (IS_ERR_OR_NULL(rstc)) {
<------><------>devres_free(ptr);
<------><------>return rstc;
<------>}
 
<------>*ptr = rstc;
<------>devres_add(dev, ptr);
 
<------>return rstc;
}
EXPORT_SYMBOL_GPL(devm_reset_control_array_get);
 
static int reset_control_get_count_from_lookup(struct device *dev)
{
<------>const struct reset_control_lookup *lookup;
<------>const char *dev_id;
<------>int count = 0;
 
<------>if (!dev)
<------><------>return -EINVAL;
 
<------>dev_id = dev_name(dev);
<------>mutex_lock(&reset_lookup_mutex);
 
<------>list_for_each_entry(lookup, &reset_lookup_list, list) {
<------><------>if (!strcmp(lookup->dev_id, dev_id))
<------><------><------>count++;
<------>}
 
<------>mutex_unlock(&reset_lookup_mutex);
 
<------>if (count == 0)
<------><------>count = -ENOENT;
 
<------>return count;
}
 
/**
 * reset_control_get_count - Count number of resets available with a device
 *
 * @dev: device for which to return the number of resets
 *
 * Returns positive reset count on success, or error number on failure and
 * on count being zero.
 */
int reset_control_get_count(struct device *dev)
{
<------>if (dev->of_node)
<------><------>return of_reset_control_get_count(dev->of_node);
 
<------>return reset_control_get_count_from_lookup(dev);
}
EXPORT_SYMBOL_GPL(reset_control_get_count);