* published by the Free Software Foundation.
*/
+#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/err.h>
* order.
* @dynamic: not-created from static DT entries.
* @available: true/false - marks if this OPP as available or not
+ * @turbo: true if turbo (boost) OPP
* @rate: Frequency in hertz
- * @u_volt: Nominal voltage in microvolts corresponding to this OPP
+ * @u_volt: Target voltage in microvolts corresponding to this OPP
+ * @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
+ * @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
+ * @u_amp: Maximum current drawn by the device in microamperes
+ * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
+ * frequency from any other OPP's frequency.
* @dev_opp: points back to the device_opp struct this opp belongs to
* @rcu_head: RCU callback head used for deferred freeing
+ * @np: OPP's device node.
*
* This structure stores the OPP information for a given device.
*/
bool available;
bool dynamic;
+ bool turbo;
unsigned long rate;
+
unsigned long u_volt;
+ unsigned long u_volt_min;
+ unsigned long u_volt_max;
+ unsigned long u_amp;
+ unsigned long clock_latency_ns;
struct device_opp *dev_opp;
struct rcu_head rcu_head;
+
+ struct device_node *np;
+};
+
+/**
+ * struct device_list_opp - devices managed by 'struct device_opp'
+ * @node: list node
+ * @dev: device to which the struct object belongs
+ * @rcu_head: RCU callback head used for deferred freeing
+ *
+ * This is an internal data structure maintaining the list of devices that are
+ * managed by 'struct device_opp'.
+ */
+struct device_list_opp {
+ struct list_head node;
+ const struct device *dev;
+ struct rcu_head rcu_head;
};
/**
* list.
* RCU usage: nodes are not modified in the list of device_opp,
* however addition is possible and is secured by dev_opp_list_lock
- * @dev: device pointer
* @srcu_head: notifier head to notify the OPP availability changes.
* @rcu_head: RCU callback head used for deferred freeing
+ * @dev_list: list of devices that share these OPPs
* @opp_list: list of opps
+ * @np: struct device_node pointer for opp's DT node.
+ * @shared_opp: OPP is shared between multiple devices.
*
* This is an internal data structure maintaining the link to opps attached to
* a device. This structure is not meant to be shared to users as it is
struct device_opp {
struct list_head node;
- struct device *dev;
struct srcu_notifier_head srcu_head;
struct rcu_head rcu_head;
+ struct list_head dev_list;
struct list_head opp_list;
+
+ struct device_node *np;
+ unsigned long clock_latency_ns_max;
+ bool shared_opp;
+ struct dev_pm_opp *suspend_opp;
};
/*
"dev_opp_list_lock protection"); \
} while (0)
+static struct device_list_opp *_find_list_dev(const struct device *dev,
+ struct device_opp *dev_opp)
+{
+ struct device_list_opp *list_dev;
+
+ list_for_each_entry(list_dev, &dev_opp->dev_list, node)
+ if (list_dev->dev == dev)
+ return list_dev;
+
+ return NULL;
+}
+
+static struct device_opp *_managed_opp(const struct device_node *np)
+{
+ struct device_opp *dev_opp;
+
+ list_for_each_entry_rcu(dev_opp, &dev_opp_list, node) {
+ if (dev_opp->np == np) {
+ /*
+ * Multiple devices can point to the same OPP table and
+ * so will have same node-pointer, np.
+ *
+ * But the OPPs will be considered as shared only if the
+ * OPP table contains a "opp-shared" property.
+ */
+ return dev_opp->shared_opp ? dev_opp : NULL;
+ }
+ }
+
+ return NULL;
+}
+
/**
* _find_device_opp() - find device_opp struct using device pointer
* @dev: device pointer used to lookup device OPPs
*/
static struct device_opp *_find_device_opp(struct device *dev)
{
- struct device_opp *tmp_dev_opp, *dev_opp = ERR_PTR(-ENODEV);
+ struct device_opp *dev_opp;
- if (unlikely(IS_ERR_OR_NULL(dev))) {
+ if (IS_ERR_OR_NULL(dev)) {
pr_err("%s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
}
- list_for_each_entry_rcu(tmp_dev_opp, &dev_opp_list, node) {
- if (tmp_dev_opp->dev == dev) {
- dev_opp = tmp_dev_opp;
- break;
- }
- }
+ list_for_each_entry_rcu(dev_opp, &dev_opp_list, node)
+ if (_find_list_dev(dev, dev_opp))
+ return dev_opp;
- return dev_opp;
+ return ERR_PTR(-ENODEV);
}
/**
opp_rcu_lockdep_assert();
tmp_opp = rcu_dereference(opp);
- if (unlikely(IS_ERR_OR_NULL(tmp_opp)) || !tmp_opp->available)
+ if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available)
pr_err("%s: Invalid parameters\n", __func__);
else
v = tmp_opp->u_volt;
opp_rcu_lockdep_assert();
tmp_opp = rcu_dereference(opp);
- if (unlikely(IS_ERR_OR_NULL(tmp_opp)) || !tmp_opp->available)
+ if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available)
pr_err("%s: Invalid parameters\n", __func__);
else
f = tmp_opp->rate;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
+/**
+ * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not
+ * @opp: opp for which turbo mode is being verified
+ *
+ * Turbo OPPs are not for normal use, and can be enabled (under certain
+ * conditions) for short duration of times to finish high throughput work
+ * quickly. Running on them for longer times may overheat the chip.
+ *
+ * Return: true if opp is turbo opp, else false.
+ *
+ * Locking: This function must be called under rcu_read_lock(). opp is a rcu
+ * protected pointer. This means that opp which could have been fetched by
+ * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are
+ * under RCU lock. The pointer returned by the opp_find_freq family must be
+ * used in the same section as the usage of this function with the pointer
+ * prior to unlocking with rcu_read_unlock() to maintain the integrity of the
+ * pointer.
+ */
+bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
+{
+ struct dev_pm_opp *tmp_opp;
+
+ opp_rcu_lockdep_assert();
+
+ tmp_opp = rcu_dereference(opp);
+ if (IS_ERR_OR_NULL(tmp_opp) || !tmp_opp->available) {
+ pr_err("%s: Invalid parameters\n", __func__);
+ return false;
+ }
+
+ return tmp_opp->turbo;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo);
+
+/**
+ * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds
+ * @dev: device for which we do this operation
+ *
+ * Return: This function returns the max clock latency in nanoseconds.
+ *
+ * Locking: This function takes rcu_read_lock().
+ */
+unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
+{
+ struct device_opp *dev_opp;
+ unsigned long clock_latency_ns;
+
+ rcu_read_lock();
+
+ dev_opp = _find_device_opp(dev);
+ if (IS_ERR(dev_opp))
+ clock_latency_ns = 0;
+ else
+ clock_latency_ns = dev_opp->clock_latency_ns_max;
+
+ rcu_read_unlock();
+ return clock_latency_ns;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);
+
/**
* dev_pm_opp_get_opp_count() - Get number of opps available in the opp list
* @dev: device for which we do this operation
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor);
+/* List-dev Helpers */
+static void _kfree_list_dev_rcu(struct rcu_head *head)
+{
+ struct device_list_opp *list_dev;
+
+ list_dev = container_of(head, struct device_list_opp, rcu_head);
+ kfree_rcu(list_dev, rcu_head);
+}
+
+static void _remove_list_dev(struct device_list_opp *list_dev,
+ struct device_opp *dev_opp)
+{
+ list_del(&list_dev->node);
+ call_srcu(&dev_opp->srcu_head.srcu, &list_dev->rcu_head,
+ _kfree_list_dev_rcu);
+}
+
+static struct device_list_opp *_add_list_dev(const struct device *dev,
+ struct device_opp *dev_opp)
+{
+ struct device_list_opp *list_dev;
+
+ list_dev = kzalloc(sizeof(*list_dev), GFP_KERNEL);
+ if (!list_dev)
+ return NULL;
+
+ /* Initialize list-dev */
+ list_dev->dev = dev;
+ list_add_rcu(&list_dev->node, &dev_opp->dev_list);
+
+ return list_dev;
+}
+
/**
- * _add_device_opp() - Allocate a new device OPP table
+ * _add_device_opp() - Find device OPP table or allocate a new one
* @dev: device for which we do this operation
*
- * New device node which uses OPPs - used when multiple devices with OPP tables
- * are maintained.
+ * It tries to find an existing table first, if it couldn't find one, it
+ * allocates a new OPP table and returns that.
*
* Return: valid device_opp pointer if success, else NULL.
*/
static struct device_opp *_add_device_opp(struct device *dev)
{
struct device_opp *dev_opp;
+ struct device_list_opp *list_dev;
+
+ /* Check for existing list for 'dev' first */
+ dev_opp = _find_device_opp(dev);
+ if (!IS_ERR(dev_opp))
+ return dev_opp;
/*
* Allocate a new device OPP table. In the infrequent case where a new
if (!dev_opp)
return NULL;
- dev_opp->dev = dev;
+ INIT_LIST_HEAD(&dev_opp->dev_list);
+
+ list_dev = _add_list_dev(dev, dev_opp);
+ if (!list_dev) {
+ kfree(dev_opp);
+ return NULL;
+ }
+
srcu_init_notifier_head(&dev_opp->srcu_head);
INIT_LIST_HEAD(&dev_opp->opp_list);
}
/**
- * _opp_add_dynamic() - Allocate a dynamic OPP.
- * @dev: device for which we do this operation
- * @freq: Frequency in Hz for this OPP
- * @u_volt: Voltage in uVolts for this OPP
- * @dynamic: Dynamically added OPPs.
- *
- * This function adds an opp definition to the opp list and returns status.
- * The opp is made available by default and it can be controlled using
- * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
- *
- * NOTE: "dynamic" parameter impacts OPPs added by the of_init_opp_table and
- * freed by of_free_opp_table.
- *
- * Locking: The internal device_opp and opp structures are RCU protected.
- * Hence this function internally uses RCU updater strategy with mutex locks
- * to keep the integrity of the internal data structures. Callers should ensure
- * that this function is *NOT* called under RCU protection or in contexts where
- * mutex cannot be locked.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
+ * _kfree_device_rcu() - Free device_opp RCU handler
+ * @head: RCU head
*/
-static int _opp_add_dynamic(struct device *dev, unsigned long freq,
- long u_volt, bool dynamic)
+static void _kfree_device_rcu(struct rcu_head *head)
{
- struct device_opp *dev_opp = NULL;
- struct dev_pm_opp *opp, *new_opp;
- struct list_head *head;
- int ret;
-
- /* allocate new OPP node */
- new_opp = kzalloc(sizeof(*new_opp), GFP_KERNEL);
- if (!new_opp)
- return -ENOMEM;
-
- /* Hold our list modification lock here */
- mutex_lock(&dev_opp_list_lock);
-
- /* populate the opp table */
- new_opp->rate = freq;
- new_opp->u_volt = u_volt;
- new_opp->available = true;
- new_opp->dynamic = dynamic;
-
- /* Check for existing list for 'dev' */
- dev_opp = _find_device_opp(dev);
- if (IS_ERR(dev_opp)) {
- dev_opp = _add_device_opp(dev);
- if (!dev_opp) {
- ret = -ENOMEM;
- goto free_opp;
- }
-
- head = &dev_opp->opp_list;
- goto list_add;
- }
-
- /*
- * Insert new OPP in order of increasing frequency
- * and discard if already present
- */
- head = &dev_opp->opp_list;
- list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
- if (new_opp->rate <= opp->rate)
- break;
- else
- head = &opp->node;
- }
-
- /* Duplicate OPPs ? */
- if (new_opp->rate == opp->rate) {
- ret = opp->available && new_opp->u_volt == opp->u_volt ?
- 0 : -EEXIST;
-
- dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
- __func__, opp->rate, opp->u_volt, opp->available,
- new_opp->rate, new_opp->u_volt, new_opp->available);
- goto free_opp;
- }
-
-list_add:
- new_opp->dev_opp = dev_opp;
- list_add_rcu(&new_opp->node, head);
- mutex_unlock(&dev_opp_list_lock);
-
- /*
- * Notify the changes in the availability of the operable
- * frequency/voltage list.
- */
- srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp);
- return 0;
+ struct device_opp *device_opp = container_of(head, struct device_opp, rcu_head);
-free_opp:
- mutex_unlock(&dev_opp_list_lock);
- kfree(new_opp);
- return ret;
+ kfree_rcu(device_opp, rcu_head);
}
/**
- * dev_pm_opp_add() - Add an OPP table from a table definitions
- * @dev: device for which we do this operation
- * @freq: Frequency in Hz for this OPP
- * @u_volt: Voltage in uVolts for this OPP
- *
- * This function adds an opp definition to the opp list and returns status.
- * The opp is made available by default and it can be controlled using
- * dev_pm_opp_enable/disable functions.
+ * _remove_device_opp() - Removes a device OPP table
+ * @dev_opp: device OPP table to be removed.
*
- * Locking: The internal device_opp and opp structures are RCU protected.
- * Hence this function internally uses RCU updater strategy with mutex locks
- * to keep the integrity of the internal data structures. Callers should ensure
- * that this function is *NOT* called under RCU protection or in contexts where
- * mutex cannot be locked.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
+ * Removes/frees device OPP table it it doesn't contain any OPPs.
*/
-int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
+static void _remove_device_opp(struct device_opp *dev_opp)
{
- return _opp_add_dynamic(dev, freq, u_volt, true);
+ struct device_list_opp *list_dev;
+
+ if (!list_empty(&dev_opp->opp_list))
+ return;
+
+ list_dev = list_first_entry(&dev_opp->dev_list, struct device_list_opp,
+ node);
+
+ _remove_list_dev(list_dev, dev_opp);
+
+ /* dev_list must be empty now */
+ WARN_ON(!list_empty(&dev_opp->dev_list));
+
+ list_del_rcu(&dev_opp->node);
+ call_srcu(&dev_opp->srcu_head.srcu, &dev_opp->rcu_head,
+ _kfree_device_rcu);
}
-EXPORT_SYMBOL_GPL(dev_pm_opp_add);
/**
* _kfree_opp_rcu() - Free OPP RCU handler
kfree_rcu(opp, rcu_head);
}
-/**
- * _kfree_device_rcu() - Free device_opp RCU handler
- * @head: RCU head
- */
-static void _kfree_device_rcu(struct rcu_head *head)
-{
- struct device_opp *device_opp = container_of(head, struct device_opp, rcu_head);
-
- kfree_rcu(device_opp, rcu_head);
-}
-
/**
* _opp_remove() - Remove an OPP from a table definition
* @dev_opp: points back to the device_opp struct this opp belongs to
* @opp: pointer to the OPP to remove
+ * @notify: OPP_EVENT_REMOVE notification should be sent or not
*
* This function removes an opp definition from the opp list.
*
* strategy.
*/
static void _opp_remove(struct device_opp *dev_opp,
- struct dev_pm_opp *opp)
+ struct dev_pm_opp *opp, bool notify)
{
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
- srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
+ if (notify)
+ srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_REMOVE, opp);
list_del_rcu(&opp->node);
call_srcu(&dev_opp->srcu_head.srcu, &opp->rcu_head, _kfree_opp_rcu);
- if (list_empty(&dev_opp->opp_list)) {
- list_del_rcu(&dev_opp->node);
- call_srcu(&dev_opp->srcu_head.srcu, &dev_opp->rcu_head,
- _kfree_device_rcu);
- }
+ _remove_device_opp(dev_opp);
}
/**
goto unlock;
}
- _opp_remove(dev_opp, opp);
+ _opp_remove(dev_opp, opp, true);
unlock:
mutex_unlock(&dev_opp_list_lock);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
-/**
- * _opp_set_availability() - helper to set the availability of an opp
- * @dev: device for which we do this operation
- * @freq: OPP frequency to modify availability
- * @availability_req: availability status requested for this opp
- *
- * Set the availability of an OPP with an RCU operation, opp_{enable,disable}
- * share a common logic which is isolated here.
- *
- * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
- * copy operation, returns 0 if no modifcation was done OR modification was
- * successful.
- *
- * Locking: The internal device_opp and opp structures are RCU protected.
- * Hence this function internally uses RCU updater strategy with mutex locks to
- * keep the integrity of the internal data structures. Callers should ensure
- * that this function is *NOT* called under RCU protection or in contexts where
- * mutex locking or synchronize_rcu() blocking calls cannot be used.
- */
-static int _opp_set_availability(struct device *dev, unsigned long freq,
- bool availability_req)
+static struct dev_pm_opp *_allocate_opp(struct device *dev,
+ struct device_opp **dev_opp)
{
- struct device_opp *dev_opp;
- struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV);
- int r = 0;
+ struct dev_pm_opp *opp;
- /* keep the node allocated */
- new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL);
- if (!new_opp)
- return -ENOMEM;
+ /* allocate new OPP node */
+ opp = kzalloc(sizeof(*opp), GFP_KERNEL);
+ if (!opp)
+ return NULL;
- mutex_lock(&dev_opp_list_lock);
+ INIT_LIST_HEAD(&opp->node);
- /* Find the device_opp */
- dev_opp = _find_device_opp(dev);
- if (IS_ERR(dev_opp)) {
- r = PTR_ERR(dev_opp);
- dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
- goto unlock;
+ *dev_opp = _add_device_opp(dev);
+ if (!*dev_opp) {
+ kfree(opp);
+ return NULL;
+ }
+
+ return opp;
+}
+
+static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
+ struct device_opp *dev_opp)
+{
+ struct dev_pm_opp *opp;
+ struct list_head *head = &dev_opp->opp_list;
+
+ /*
+ * Insert new OPP in order of increasing frequency and discard if
+ * already present.
+ *
+ * Need to use &dev_opp->opp_list in the condition part of the 'for'
+ * loop, don't replace it with head otherwise it will become an infinite
+ * loop.
+ */
+ list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) {
+ if (new_opp->rate > opp->rate) {
+ head = &opp->node;
+ continue;
+ }
+
+ if (new_opp->rate < opp->rate)
+ break;
+
+ /* Duplicate OPPs */
+ dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n",
+ __func__, opp->rate, opp->u_volt, opp->available,
+ new_opp->rate, new_opp->u_volt, new_opp->available);
+
+ return opp->available && new_opp->u_volt == opp->u_volt ?
+ 0 : -EEXIST;
+ }
+
+ new_opp->dev_opp = dev_opp;
+ list_add_rcu(&new_opp->node, head);
+
+ return 0;
+}
+
+/**
+ * _opp_add_dynamic() - Allocate a dynamic OPP.
+ * @dev: device for which we do this operation
+ * @freq: Frequency in Hz for this OPP
+ * @u_volt: Voltage in uVolts for this OPP
+ * @dynamic: Dynamically added OPPs.
+ *
+ * This function adds an opp definition to the opp list and returns status.
+ * The opp is made available by default and it can be controlled using
+ * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove.
+ *
+ * NOTE: "dynamic" parameter impacts OPPs added by the of_init_opp_table and
+ * freed by of_free_opp_table.
+ *
+ * Locking: The internal device_opp and opp structures are RCU protected.
+ * Hence this function internally uses RCU updater strategy with mutex locks
+ * to keep the integrity of the internal data structures. Callers should ensure
+ * that this function is *NOT* called under RCU protection or in contexts where
+ * mutex cannot be locked.
+ *
+ * Return:
+ * 0 On success OR
+ * Duplicate OPPs (both freq and volt are same) and opp->available
+ * -EEXIST Freq are same and volt are different OR
+ * Duplicate OPPs (both freq and volt are same) and !opp->available
+ * -ENOMEM Memory allocation failure
+ */
+static int _opp_add_dynamic(struct device *dev, unsigned long freq,
+ long u_volt, bool dynamic)
+{
+ struct device_opp *dev_opp;
+ struct dev_pm_opp *new_opp;
+ int ret;
+
+ /* Hold our list modification lock here */
+ mutex_lock(&dev_opp_list_lock);
+
+ new_opp = _allocate_opp(dev, &dev_opp);
+ if (!new_opp) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ /* populate the opp table */
+ new_opp->rate = freq;
+ new_opp->u_volt = u_volt;
+ new_opp->available = true;
+ new_opp->dynamic = dynamic;
+
+ ret = _opp_add(dev, new_opp, dev_opp);
+ if (ret)
+ goto free_opp;
+
+ mutex_unlock(&dev_opp_list_lock);
+
+ /*
+ * Notify the changes in the availability of the operable
+ * frequency/voltage list.
+ */
+ srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp);
+ return 0;
+
+free_opp:
+ _opp_remove(dev_opp, new_opp, false);
+unlock:
+ mutex_unlock(&dev_opp_list_lock);
+ return ret;
+}
+
+/* TODO: Support multiple regulators */
+static int opp_get_microvolt(struct dev_pm_opp *opp, struct device *dev)
+{
+ u32 microvolt[3] = {0};
+ int count, ret;
+
+ count = of_property_count_u32_elems(opp->np, "opp-microvolt");
+ if (!count)
+ return 0;
+
+ /* There can be one or three elements here */
+ if (count != 1 && count != 3) {
+ dev_err(dev, "%s: Invalid number of elements in opp-microvolt property (%d)\n",
+ __func__, count);
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_array(opp->np, "opp-microvolt", microvolt,
+ count);
+ if (ret) {
+ dev_err(dev, "%s: error parsing opp-microvolt: %d\n", __func__,
+ ret);
+ return -EINVAL;
+ }
+
+ opp->u_volt = microvolt[0];
+ opp->u_volt_min = microvolt[1];
+ opp->u_volt_max = microvolt[2];
+
+ return 0;
+}
+
+/**
+ * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
+ * @dev: device for which we do this operation
+ * @np: device node
+ *
+ * This function adds an opp definition to the opp list and returns status. The
+ * opp can be controlled using dev_pm_opp_enable/disable functions and may be
+ * removed by dev_pm_opp_remove.
+ *
+ * Locking: The internal device_opp and opp structures are RCU protected.
+ * Hence this function internally uses RCU updater strategy with mutex locks
+ * to keep the integrity of the internal data structures. Callers should ensure
+ * that this function is *NOT* called under RCU protection or in contexts where
+ * mutex cannot be locked.
+ *
+ * Return:
+ * 0 On success OR
+ * Duplicate OPPs (both freq and volt are same) and opp->available
+ * -EEXIST Freq are same and volt are different OR
+ * Duplicate OPPs (both freq and volt are same) and !opp->available
+ * -ENOMEM Memory allocation failure
+ * -EINVAL Failed parsing the OPP node
+ */
+static int _opp_add_static_v2(struct device *dev, struct device_node *np)
+{
+ struct device_opp *dev_opp;
+ struct dev_pm_opp *new_opp;
+ u64 rate;
+ u32 val;
+ int ret;
+
+ /* Hold our list modification lock here */
+ mutex_lock(&dev_opp_list_lock);
+
+ new_opp = _allocate_opp(dev, &dev_opp);
+ if (!new_opp) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ ret = of_property_read_u64(np, "opp-hz", &rate);
+ if (ret < 0) {
+ dev_err(dev, "%s: opp-hz not found\n", __func__);
+ goto free_opp;
+ }
+
+ /*
+ * Rate is defined as an unsigned long in clk API, and so casting
+ * explicitly to its type. Must be fixed once rate is 64 bit
+ * guaranteed in clk API.
+ */
+ new_opp->rate = (unsigned long)rate;
+ new_opp->turbo = of_property_read_bool(np, "turbo-mode");
+
+ new_opp->np = np;
+ new_opp->dynamic = false;
+ new_opp->available = true;
+
+ if (!of_property_read_u32(np, "clock-latency-ns", &val))
+ new_opp->clock_latency_ns = val;
+
+ ret = opp_get_microvolt(new_opp, dev);
+ if (ret)
+ goto free_opp;
+
+ if (!of_property_read_u32(new_opp->np, "opp-microamp", &val))
+ new_opp->u_amp = val;
+
+ ret = _opp_add(dev, new_opp, dev_opp);
+ if (ret)
+ goto free_opp;
+
+ /* OPP to select on device suspend */
+ if (of_property_read_bool(np, "opp-suspend")) {
+ if (dev_opp->suspend_opp)
+ dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
+ __func__, dev_opp->suspend_opp->rate,
+ new_opp->rate);
+ else
+ dev_opp->suspend_opp = new_opp;
+ }
+
+ if (new_opp->clock_latency_ns > dev_opp->clock_latency_ns_max)
+ dev_opp->clock_latency_ns_max = new_opp->clock_latency_ns;
+
+ mutex_unlock(&dev_opp_list_lock);
+
+ pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
+ __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
+ new_opp->u_volt_min, new_opp->u_volt_max,
+ new_opp->clock_latency_ns);
+
+ /*
+ * Notify the changes in the availability of the operable
+ * frequency/voltage list.
+ */
+ srcu_notifier_call_chain(&dev_opp->srcu_head, OPP_EVENT_ADD, new_opp);
+ return 0;
+
+free_opp:
+ _opp_remove(dev_opp, new_opp, false);
+unlock:
+ mutex_unlock(&dev_opp_list_lock);
+ return ret;
+}
+
+/**
+ * dev_pm_opp_add() - Add an OPP table from a table definitions
+ * @dev: device for which we do this operation
+ * @freq: Frequency in Hz for this OPP
+ * @u_volt: Voltage in uVolts for this OPP
+ *
+ * This function adds an opp definition to the opp list and returns status.
+ * The opp is made available by default and it can be controlled using
+ * dev_pm_opp_enable/disable functions.
+ *
+ * Locking: The internal device_opp and opp structures are RCU protected.
+ * Hence this function internally uses RCU updater strategy with mutex locks
+ * to keep the integrity of the internal data structures. Callers should ensure
+ * that this function is *NOT* called under RCU protection or in contexts where
+ * mutex cannot be locked.
+ *
+ * Return:
+ * 0 On success OR
+ * Duplicate OPPs (both freq and volt are same) and opp->available
+ * -EEXIST Freq are same and volt are different OR
+ * Duplicate OPPs (both freq and volt are same) and !opp->available
+ * -ENOMEM Memory allocation failure
+ */
+int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
+{
+ return _opp_add_dynamic(dev, freq, u_volt, true);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_add);
+
+/**
+ * _opp_set_availability() - helper to set the availability of an opp
+ * @dev: device for which we do this operation
+ * @freq: OPP frequency to modify availability
+ * @availability_req: availability status requested for this opp
+ *
+ * Set the availability of an OPP with an RCU operation, opp_{enable,disable}
+ * share a common logic which is isolated here.
+ *
+ * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the
+ * copy operation, returns 0 if no modifcation was done OR modification was
+ * successful.
+ *
+ * Locking: The internal device_opp and opp structures are RCU protected.
+ * Hence this function internally uses RCU updater strategy with mutex locks to
+ * keep the integrity of the internal data structures. Callers should ensure
+ * that this function is *NOT* called under RCU protection or in contexts where
+ * mutex locking or synchronize_rcu() blocking calls cannot be used.
+ */
+static int _opp_set_availability(struct device *dev, unsigned long freq,
+ bool availability_req)
+{
+ struct device_opp *dev_opp;
+ struct dev_pm_opp *new_opp, *tmp_opp, *opp = ERR_PTR(-ENODEV);
+ int r = 0;
+
+ /* keep the node allocated */
+ new_opp = kmalloc(sizeof(*new_opp), GFP_KERNEL);
+ if (!new_opp)
+ return -ENOMEM;
+
+ mutex_lock(&dev_opp_list_lock);
+
+ /* Find the device_opp */
+ dev_opp = _find_device_opp(dev);
+ if (IS_ERR(dev_opp)) {
+ r = PTR_ERR(dev_opp);
+ dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r);
+ goto unlock;
}
/* Do we have the frequency? */
#ifdef CONFIG_OF
/**
- * of_init_opp_table() - Initialize opp table from device tree
+ * of_free_opp_table() - Free OPP table entries created from static DT entries
* @dev: device pointer used to lookup device OPPs.
*
- * Register the initial OPP table with the OPP library for given device.
+ * Free OPPs created using static entries present in DT.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Hence this function indirectly uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
- *
- * Return:
- * 0 On success OR
- * Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST Freq are same and volt are different OR
- * Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM Memory allocation failure
- * -ENODEV when 'operating-points' property is not found or is invalid data
- * in device node.
- * -ENODATA when empty 'operating-points' property is found
*/
-int of_init_opp_table(struct device *dev)
+void of_free_opp_table(struct device *dev)
+{
+ struct device_opp *dev_opp;
+ struct dev_pm_opp *opp, *tmp;
+
+ /* Hold our list modification lock here */
+ mutex_lock(&dev_opp_list_lock);
+
+ /* Check for existing list for 'dev' */
+ dev_opp = _find_device_opp(dev);
+ if (IS_ERR(dev_opp)) {
+ int error = PTR_ERR(dev_opp);
+
+ if (error != -ENODEV)
+ WARN(1, "%s: dev_opp: %d\n",
+ IS_ERR_OR_NULL(dev) ?
+ "Invalid device" : dev_name(dev),
+ error);
+ goto unlock;
+ }
+
+ /* Find if dev_opp manages a single device */
+ if (list_is_singular(&dev_opp->dev_list)) {
+ /* Free static OPPs */
+ list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) {
+ if (!opp->dynamic)
+ _opp_remove(dev_opp, opp, true);
+ }
+ } else {
+ _remove_list_dev(_find_list_dev(dev, dev_opp), dev_opp);
+ }
+
+unlock:
+ mutex_unlock(&dev_opp_list_lock);
+}
+EXPORT_SYMBOL_GPL(of_free_opp_table);
+
+void of_cpumask_free_opp_table(cpumask_var_t cpumask)
+{
+ struct device *cpu_dev;
+ int cpu;
+
+ WARN_ON(cpumask_empty(cpumask));
+
+ for_each_cpu(cpu, cpumask) {
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__,
+ cpu);
+ continue;
+ }
+
+ of_free_opp_table(cpu_dev);
+ }
+}
+EXPORT_SYMBOL_GPL(of_cpumask_free_opp_table);
+
+/* Returns opp descriptor node from its phandle. Caller must do of_node_put() */
+static struct device_node *
+_of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop)
+{
+ struct device_node *opp_np;
+
+ opp_np = of_find_node_by_phandle(be32_to_cpup(prop->value));
+ if (!opp_np) {
+ dev_err(dev, "%s: Prop: %s contains invalid opp desc phandle\n",
+ __func__, prop->name);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return opp_np;
+}
+
+/* Returns opp descriptor node for a device. Caller must do of_node_put() */
+static struct device_node *_of_get_opp_desc_node(struct device *dev)
+{
+ const struct property *prop;
+
+ prop = of_find_property(dev->of_node, "operating-points-v2", NULL);
+ if (!prop)
+ return ERR_PTR(-ENODEV);
+ if (!prop->value)
+ return ERR_PTR(-ENODATA);
+
+ /*
+ * TODO: Support for multiple OPP tables.
+ *
+ * There should be only ONE phandle present in "operating-points-v2"
+ * property.
+ */
+ if (prop->length != sizeof(__be32)) {
+ dev_err(dev, "%s: Invalid opp desc phandle\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return _of_get_opp_desc_node_from_prop(dev, prop);
+}
+
+/* Initializes OPP tables based on new bindings */
+static int _of_init_opp_table_v2(struct device *dev,
+ const struct property *prop)
+{
+ struct device_node *opp_np, *np;
+ struct device_opp *dev_opp;
+ int ret = 0, count = 0;
+
+ if (!prop->value)
+ return -ENODATA;
+
+ /* Get opp node */
+ opp_np = _of_get_opp_desc_node_from_prop(dev, prop);
+ if (IS_ERR(opp_np))
+ return PTR_ERR(opp_np);
+
+ dev_opp = _managed_opp(opp_np);
+ if (dev_opp) {
+ /* OPPs are already managed */
+ if (!_add_list_dev(dev, dev_opp))
+ ret = -ENOMEM;
+ goto put_opp_np;
+ }
+
+ /* We have opp-list node now, iterate over it and add OPPs */
+ for_each_available_child_of_node(opp_np, np) {
+ count++;
+
+ ret = _opp_add_static_v2(dev, np);
+ if (ret) {
+ dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
+ ret);
+ goto free_table;
+ }
+ }
+
+ /* There should be one of more OPP defined */
+ if (WARN_ON(!count)) {
+ ret = -ENOENT;
+ goto put_opp_np;
+ }
+
+ dev_opp = _find_device_opp(dev);
+ if (WARN_ON(IS_ERR(dev_opp))) {
+ ret = PTR_ERR(dev_opp);
+ goto free_table;
+ }
+
+ dev_opp->np = opp_np;
+ dev_opp->shared_opp = of_property_read_bool(opp_np, "opp-shared");
+
+ of_node_put(opp_np);
+ return 0;
+
+free_table:
+ of_free_opp_table(dev);
+put_opp_np:
+ of_node_put(opp_np);
+
+ return ret;
+}
+
+/* Initializes OPP tables based on old-deprecated bindings */
+static int _of_init_opp_table_v1(struct device *dev)
{
const struct property *prop;
const __be32 *val;
return 0;
}
-EXPORT_SYMBOL_GPL(of_init_opp_table);
/**
- * of_free_opp_table() - Free OPP table entries created from static DT entries
+ * of_init_opp_table() - Initialize opp table from device tree
* @dev: device pointer used to lookup device OPPs.
*
- * Free OPPs created using static entries present in DT.
+ * Register the initial OPP table with the OPP library for given device.
*
* Locking: The internal device_opp and opp structures are RCU protected.
* Hence this function indirectly uses RCU updater strategy with mutex locks
* to keep the integrity of the internal data structures. Callers should ensure
* that this function is *NOT* called under RCU protection or in contexts where
* mutex cannot be locked.
+ *
+ * Return:
+ * 0 On success OR
+ * Duplicate OPPs (both freq and volt are same) and opp->available
+ * -EEXIST Freq are same and volt are different OR
+ * Duplicate OPPs (both freq and volt are same) and !opp->available
+ * -ENOMEM Memory allocation failure
+ * -ENODEV when 'operating-points' property is not found or is invalid data
+ * in device node.
+ * -ENODATA when empty 'operating-points' property is found
+ * -EINVAL when invalid entries are found in opp-v2 table
*/
-void of_free_opp_table(struct device *dev)
+int of_init_opp_table(struct device *dev)
{
+ const struct property *prop;
+
+ /*
+ * OPPs have two version of bindings now. The older one is deprecated,
+ * try for the new binding first.
+ */
+ prop = of_find_property(dev->of_node, "operating-points-v2", NULL);
+ if (!prop) {
+ /*
+ * Try old-deprecated bindings for backward compatibility with
+ * older dtbs.
+ */
+ return _of_init_opp_table_v1(dev);
+ }
+
+ return _of_init_opp_table_v2(dev, prop);
+}
+EXPORT_SYMBOL_GPL(of_init_opp_table);
+
+int of_cpumask_init_opp_table(cpumask_var_t cpumask)
+{
+ struct device *cpu_dev;
+ int cpu, ret = 0;
+
+ WARN_ON(cpumask_empty(cpumask));
+
+ for_each_cpu(cpu, cpumask) {
+ cpu_dev = get_cpu_device(cpu);
+ if (!cpu_dev) {
+ pr_err("%s: failed to get cpu%d device\n", __func__,
+ cpu);
+ continue;
+ }
+
+ ret = of_init_opp_table(cpu_dev);
+ if (ret) {
+ pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
+ __func__, cpu, ret);
+
+ /* Free all other OPPs */
+ of_cpumask_free_opp_table(cpumask);
+ break;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_cpumask_init_opp_table);
+
+/* Required only for V1 bindings, as v2 can manage it from DT itself */
+int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
+{
+ struct device_list_opp *list_dev;
struct device_opp *dev_opp;
- struct dev_pm_opp *opp, *tmp;
+ struct device *dev;
+ int cpu, ret = 0;
- /* Check for existing list for 'dev' */
- dev_opp = _find_device_opp(dev);
+ rcu_read_lock();
+
+ dev_opp = _find_device_opp(cpu_dev);
if (IS_ERR(dev_opp)) {
- int error = PTR_ERR(dev_opp);
- if (error != -ENODEV)
- WARN(1, "%s: dev_opp: %d\n",
- IS_ERR_OR_NULL(dev) ?
- "Invalid device" : dev_name(dev),
- error);
- return;
+ ret = -EINVAL;
+ goto out_rcu_read_unlock;
}
- /* Hold our list modification lock here */
- mutex_lock(&dev_opp_list_lock);
+ for_each_cpu(cpu, cpumask) {
+ if (cpu == cpu_dev->id)
+ continue;
- /* Free static OPPs */
- list_for_each_entry_safe(opp, tmp, &dev_opp->opp_list, node) {
- if (!opp->dynamic)
- _opp_remove(dev_opp, opp);
+ dev = get_cpu_device(cpu);
+ if (!dev) {
+ dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
+ __func__, cpu);
+ continue;
+ }
+
+ list_dev = _add_list_dev(dev, dev_opp);
+ if (!list_dev) {
+ dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
+ __func__, cpu);
+ continue;
+ }
}
+out_rcu_read_unlock:
+ rcu_read_unlock();
- mutex_unlock(&dev_opp_list_lock);
+ return 0;
}
-EXPORT_SYMBOL_GPL(of_free_opp_table);
+EXPORT_SYMBOL_GPL(set_cpus_sharing_opps);
+
+/*
+ * Works only for OPP v2 bindings.
+ *
+ * cpumask should be already set to mask of cpu_dev->id.
+ * Returns -ENOENT if operating-points-v2 bindings aren't supported.
+ */
+int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
+{
+ struct device_node *np, *tmp_np;
+ struct device *tcpu_dev;
+ int cpu, ret = 0;
+
+ /* Get OPP descriptor node */
+ np = _of_get_opp_desc_node(cpu_dev);
+ if (IS_ERR(np)) {
+ dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
+ PTR_ERR(np));
+ return -ENOENT;
+ }
+
+ /* OPPs are shared ? */
+ if (!of_property_read_bool(np, "opp-shared"))
+ goto put_cpu_node;
+
+ for_each_possible_cpu(cpu) {
+ if (cpu == cpu_dev->id)
+ continue;
+
+ tcpu_dev = get_cpu_device(cpu);
+ if (!tcpu_dev) {
+ dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
+ __func__, cpu);
+ ret = -ENODEV;
+ goto put_cpu_node;
+ }
+
+ /* Get OPP descriptor node */
+ tmp_np = _of_get_opp_desc_node(tcpu_dev);
+ if (IS_ERR(tmp_np)) {
+ dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
+ __func__, PTR_ERR(tmp_np));
+ ret = PTR_ERR(tmp_np);
+ goto put_cpu_node;
+ }
+
+ /* CPUs are sharing opp node */
+ if (np == tmp_np)
+ cpumask_set_cpu(cpu, cpumask);
+
+ of_node_put(tmp_np);
+ }
+
+put_cpu_node:
+ of_node_put(np);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_get_cpus_sharing_opps);
#endif
git.openpandora.org / pandora-kernel.git / commitdiff