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eaf91db0ab
Currently the reset core has internal support for counting the number of resets for a device described in DT. Generalize this to devices using lookup resets, and export it for public use. This will be used by generic drivers that need to be sure a device is controlled by a single, dedicated reset line (e.g. vfio-platform). Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> [p.zabel@pengutronix.de: fixed a typo in reset_control_get_count comment] Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
436 lines
14 KiB
C
436 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_RESET_H_
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#define _LINUX_RESET_H_
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#include <linux/types.h>
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struct device;
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struct device_node;
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struct reset_control;
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#ifdef CONFIG_RESET_CONTROLLER
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int reset_control_reset(struct reset_control *rstc);
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int reset_control_assert(struct reset_control *rstc);
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int reset_control_deassert(struct reset_control *rstc);
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int reset_control_status(struct reset_control *rstc);
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struct reset_control *__of_reset_control_get(struct device_node *node,
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const char *id, int index, bool shared,
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bool optional);
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struct reset_control *__reset_control_get(struct device *dev, const char *id,
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int index, bool shared,
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bool optional);
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void reset_control_put(struct reset_control *rstc);
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int __device_reset(struct device *dev, bool optional);
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struct reset_control *__devm_reset_control_get(struct device *dev,
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const char *id, int index, bool shared,
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bool optional);
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struct reset_control *devm_reset_control_array_get(struct device *dev,
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bool shared, bool optional);
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struct reset_control *of_reset_control_array_get(struct device_node *np,
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bool shared, bool optional);
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int reset_control_get_count(struct device *dev);
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#else
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static inline int reset_control_reset(struct reset_control *rstc)
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{
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return 0;
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}
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static inline int reset_control_assert(struct reset_control *rstc)
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{
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return 0;
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}
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static inline int reset_control_deassert(struct reset_control *rstc)
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{
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return 0;
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}
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static inline int reset_control_status(struct reset_control *rstc)
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{
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return 0;
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}
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static inline void reset_control_put(struct reset_control *rstc)
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{
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}
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static inline int __device_reset(struct device *dev, bool optional)
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{
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return optional ? 0 : -ENOTSUPP;
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}
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static inline struct reset_control *__of_reset_control_get(
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struct device_node *node,
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const char *id, int index, bool shared,
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bool optional)
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{
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return optional ? NULL : ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_control *__reset_control_get(
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struct device *dev, const char *id,
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int index, bool shared, bool optional)
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{
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return optional ? NULL : ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_control *__devm_reset_control_get(
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struct device *dev, const char *id,
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int index, bool shared, bool optional)
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{
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return optional ? NULL : ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_control *
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devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
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{
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return optional ? NULL : ERR_PTR(-ENOTSUPP);
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}
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static inline struct reset_control *
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of_reset_control_array_get(struct device_node *np, bool shared, bool optional)
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{
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return optional ? NULL : ERR_PTR(-ENOTSUPP);
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}
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static inline int reset_control_get_count(struct device *dev)
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{
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return -ENOENT;
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}
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#endif /* CONFIG_RESET_CONTROLLER */
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static inline int __must_check device_reset(struct device *dev)
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{
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return __device_reset(dev, false);
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}
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static inline int device_reset_optional(struct device *dev)
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{
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return __device_reset(dev, true);
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}
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/**
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* reset_control_get_exclusive - Lookup and obtain an exclusive reference
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* to a reset controller.
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* @dev: device to be reset by the controller
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* @id: reset line name
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*
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* Returns a struct reset_control or IS_ERR() condition containing errno.
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* If this function is called more than once for the same reset_control it will
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* return -EBUSY.
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*
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* See reset_control_get_shared for details on shared references to
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* reset-controls.
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*
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* Use of id names is optional.
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*/
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static inline struct reset_control *
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__must_check reset_control_get_exclusive(struct device *dev, const char *id)
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{
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return __reset_control_get(dev, id, 0, false, false);
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}
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/**
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* reset_control_get_shared - Lookup and obtain a shared reference to a
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* reset controller.
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* @dev: device to be reset by the controller
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* @id: reset line name
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*
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* Returns a struct reset_control or IS_ERR() condition containing errno.
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* This function is intended for use with reset-controls which are shared
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* between hardware blocks.
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*
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* When a reset-control is shared, the behavior of reset_control_assert /
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* deassert is changed, the reset-core will keep track of a deassert_count
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* and only (re-)assert the reset after reset_control_assert has been called
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* as many times as reset_control_deassert was called. Also see the remark
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* about shared reset-controls in the reset_control_assert docs.
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*
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* Calling reset_control_assert without first calling reset_control_deassert
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* is not allowed on a shared reset control. Calling reset_control_reset is
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* also not allowed on a shared reset control.
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*
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* Use of id names is optional.
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*/
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static inline struct reset_control *reset_control_get_shared(
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struct device *dev, const char *id)
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{
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return __reset_control_get(dev, id, 0, true, false);
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}
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static inline struct reset_control *reset_control_get_optional_exclusive(
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struct device *dev, const char *id)
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{
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return __reset_control_get(dev, id, 0, false, true);
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}
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static inline struct reset_control *reset_control_get_optional_shared(
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struct device *dev, const char *id)
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{
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return __reset_control_get(dev, id, 0, true, true);
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}
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/**
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* of_reset_control_get_exclusive - Lookup and obtain an exclusive reference
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* to a reset controller.
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* @node: device to be reset by the controller
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* @id: reset line name
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*
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* Returns a struct reset_control or IS_ERR() condition containing errno.
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*
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* Use of id names is optional.
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*/
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static inline struct reset_control *of_reset_control_get_exclusive(
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struct device_node *node, const char *id)
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{
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return __of_reset_control_get(node, id, 0, false, false);
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}
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/**
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* of_reset_control_get_shared - Lookup and obtain a shared reference
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* to a reset controller.
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* @node: device to be reset by the controller
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* @id: reset line name
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*
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* When a reset-control is shared, the behavior of reset_control_assert /
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* deassert is changed, the reset-core will keep track of a deassert_count
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* and only (re-)assert the reset after reset_control_assert has been called
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* as many times as reset_control_deassert was called. Also see the remark
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* about shared reset-controls in the reset_control_assert docs.
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*
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* Calling reset_control_assert without first calling reset_control_deassert
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* is not allowed on a shared reset control. Calling reset_control_reset is
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* also not allowed on a shared reset control.
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* Returns a struct reset_control or IS_ERR() condition containing errno.
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*
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* Use of id names is optional.
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*/
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static inline struct reset_control *of_reset_control_get_shared(
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struct device_node *node, const char *id)
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{
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return __of_reset_control_get(node, id, 0, true, false);
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}
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/**
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* of_reset_control_get_exclusive_by_index - Lookup and obtain an exclusive
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* reference to a reset controller
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* by index.
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* @node: device to be reset by the controller
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* @index: index of the reset controller
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*
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* This is to be used to perform a list of resets for a device or power domain
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* in whatever order. Returns a struct reset_control or IS_ERR() condition
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* containing errno.
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*/
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static inline struct reset_control *of_reset_control_get_exclusive_by_index(
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struct device_node *node, int index)
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{
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return __of_reset_control_get(node, NULL, index, false, false);
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}
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/**
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* of_reset_control_get_shared_by_index - Lookup and obtain a shared
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* reference to a reset controller
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* by index.
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* @node: device to be reset by the controller
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* @index: index of the reset controller
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*
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* When a reset-control is shared, the behavior of reset_control_assert /
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* deassert is changed, the reset-core will keep track of a deassert_count
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* and only (re-)assert the reset after reset_control_assert has been called
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* as many times as reset_control_deassert was called. Also see the remark
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* about shared reset-controls in the reset_control_assert docs.
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*
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* Calling reset_control_assert without first calling reset_control_deassert
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* is not allowed on a shared reset control. Calling reset_control_reset is
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* also not allowed on a shared reset control.
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* Returns a struct reset_control or IS_ERR() condition containing errno.
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*
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* This is to be used to perform a list of resets for a device or power domain
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* in whatever order. Returns a struct reset_control or IS_ERR() condition
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* containing errno.
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*/
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static inline struct reset_control *of_reset_control_get_shared_by_index(
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struct device_node *node, int index)
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{
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return __of_reset_control_get(node, NULL, index, true, false);
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}
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/**
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* devm_reset_control_get_exclusive - resource managed
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* reset_control_get_exclusive()
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* @dev: device to be reset by the controller
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* @id: reset line name
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*
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* Managed reset_control_get_exclusive(). For reset controllers returned
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* from this function, reset_control_put() is called automatically on driver
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* detach.
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*
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* See reset_control_get_exclusive() for more information.
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*/
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static inline struct reset_control *
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__must_check devm_reset_control_get_exclusive(struct device *dev,
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const char *id)
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{
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return __devm_reset_control_get(dev, id, 0, false, false);
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}
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/**
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* devm_reset_control_get_shared - resource managed reset_control_get_shared()
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* @dev: device to be reset by the controller
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* @id: reset line name
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*
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* Managed reset_control_get_shared(). For reset controllers returned from
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* this function, reset_control_put() is called automatically on driver detach.
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* See reset_control_get_shared() for more information.
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*/
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static inline struct reset_control *devm_reset_control_get_shared(
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struct device *dev, const char *id)
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{
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return __devm_reset_control_get(dev, id, 0, true, false);
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}
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static inline struct reset_control *devm_reset_control_get_optional_exclusive(
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struct device *dev, const char *id)
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{
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return __devm_reset_control_get(dev, id, 0, false, true);
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}
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static inline struct reset_control *devm_reset_control_get_optional_shared(
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struct device *dev, const char *id)
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{
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return __devm_reset_control_get(dev, id, 0, true, true);
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}
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/**
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* devm_reset_control_get_exclusive_by_index - resource managed
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* reset_control_get_exclusive()
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* @dev: device to be reset by the controller
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* @index: index of the reset controller
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*
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* Managed reset_control_get_exclusive(). For reset controllers returned from
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* this function, reset_control_put() is called automatically on driver
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* detach.
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*
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* See reset_control_get_exclusive() for more information.
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*/
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static inline struct reset_control *
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devm_reset_control_get_exclusive_by_index(struct device *dev, int index)
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{
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return __devm_reset_control_get(dev, NULL, index, false, false);
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}
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/**
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* devm_reset_control_get_shared_by_index - resource managed
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* reset_control_get_shared
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* @dev: device to be reset by the controller
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* @index: index of the reset controller
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*
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* Managed reset_control_get_shared(). For reset controllers returned from
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* this function, reset_control_put() is called automatically on driver detach.
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* See reset_control_get_shared() for more information.
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*/
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static inline struct reset_control *
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devm_reset_control_get_shared_by_index(struct device *dev, int index)
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{
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return __devm_reset_control_get(dev, NULL, index, true, false);
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}
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/*
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* TEMPORARY calls to use during transition:
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*
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* of_reset_control_get() => of_reset_control_get_exclusive()
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*
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* These inline function calls will be removed once all consumers
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* have been moved over to the new explicit API.
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*/
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static inline struct reset_control *of_reset_control_get(
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struct device_node *node, const char *id)
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{
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return of_reset_control_get_exclusive(node, id);
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}
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static inline struct reset_control *of_reset_control_get_by_index(
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struct device_node *node, int index)
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{
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return of_reset_control_get_exclusive_by_index(node, index);
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}
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static inline struct reset_control *devm_reset_control_get(
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struct device *dev, const char *id)
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{
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return devm_reset_control_get_exclusive(dev, id);
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}
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static inline struct reset_control *devm_reset_control_get_optional(
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struct device *dev, const char *id)
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{
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return devm_reset_control_get_optional_exclusive(dev, id);
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}
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static inline struct reset_control *devm_reset_control_get_by_index(
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struct device *dev, int index)
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{
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return devm_reset_control_get_exclusive_by_index(dev, index);
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}
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/*
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* APIs to manage a list of reset controllers
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*/
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static inline struct reset_control *
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devm_reset_control_array_get_exclusive(struct device *dev)
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{
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return devm_reset_control_array_get(dev, false, false);
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}
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static inline struct reset_control *
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devm_reset_control_array_get_shared(struct device *dev)
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{
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return devm_reset_control_array_get(dev, true, false);
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}
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static inline struct reset_control *
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devm_reset_control_array_get_optional_exclusive(struct device *dev)
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{
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return devm_reset_control_array_get(dev, false, true);
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}
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static inline struct reset_control *
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devm_reset_control_array_get_optional_shared(struct device *dev)
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{
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return devm_reset_control_array_get(dev, true, true);
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}
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static inline struct reset_control *
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of_reset_control_array_get_exclusive(struct device_node *node)
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{
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return of_reset_control_array_get(node, false, false);
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}
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static inline struct reset_control *
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of_reset_control_array_get_shared(struct device_node *node)
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{
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return of_reset_control_array_get(node, true, false);
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}
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static inline struct reset_control *
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of_reset_control_array_get_optional_exclusive(struct device_node *node)
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{
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return of_reset_control_array_get(node, false, true);
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}
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static inline struct reset_control *
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of_reset_control_array_get_optional_shared(struct device_node *node)
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{
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return of_reset_control_array_get(node, true, true);
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}
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#endif
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