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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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17c82e206d
Many devices may want to request a bunch of resets and control them. So it's better to manage them as an array. Add APIs to _get() an array of reset_control, reusing the _assert(), _deassert(), and _reset() APIs for single reset controls. Since reset controls already may control multiple reset lines with a single hardware bit, from the user perspective, reset control arrays are not at all different from single reset controls. Note that these APIs don't guarantee that the reset lines managed in the array are handled in any particular order. Cc: Felipe Balbi <balbi@kernel.org> Cc: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org> [p.zabel@pengutronix.de: changed API to hide reset control arrays behind struct reset_control] Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
446 lines
14 KiB
C
446 lines
14 KiB
C
#ifndef _LINUX_RESET_H_
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#define _LINUX_RESET_H_
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#include <linux/device.h>
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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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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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int __must_check device_reset(struct device *dev);
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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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static inline int device_reset_optional(struct device *dev)
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{
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return device_reset(dev);
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}
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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 __must_check device_reset(struct device *dev)
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{
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WARN_ON(1);
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return -ENOTSUPP;
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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 -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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#endif /* CONFIG_RESET_CONTROLLER */
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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 then 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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#ifndef CONFIG_RESET_CONTROLLER
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WARN_ON(1);
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#endif
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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 an 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 an 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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#ifndef CONFIG_RESET_CONTROLLER
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WARN_ON(1);
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#endif
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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 *reset_control_get(
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struct device *dev, const char *id)
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{
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return reset_control_get_exclusive(dev, id);
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}
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static inline struct reset_control *reset_control_get_optional(
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struct device *dev, const char *id)
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{
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return reset_control_get_optional_exclusive(dev, id);
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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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