242 lines
9.6 KiB
C
242 lines
9.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Texas Instruments System Control Interface Protocol
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*
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* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
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* Nishanth Menon
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*/
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#ifndef __TISCI_PROTOCOL_H
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#define __TISCI_PROTOCOL_H
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/**
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* struct ti_sci_version_info - version information structure
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* @abi_major: Major ABI version. Change here implies risk of backward
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* compatibility break.
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* @abi_minor: Minor ABI version. Change here implies new feature addition,
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* or compatible change in ABI.
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* @firmware_revision: Firmware revision (not usually used).
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* @firmware_description: Firmware description (not usually used).
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*/
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struct ti_sci_version_info {
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u8 abi_major;
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u8 abi_minor;
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u16 firmware_revision;
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char firmware_description[32];
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};
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struct ti_sci_handle;
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/**
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* struct ti_sci_core_ops - SoC Core Operations
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* @reboot_device: Reboot the SoC
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* Returns 0 for successful request(ideally should never return),
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* else returns corresponding error value.
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*/
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struct ti_sci_core_ops {
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int (*reboot_device)(const struct ti_sci_handle *handle);
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};
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/**
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* struct ti_sci_dev_ops - Device control operations
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* @get_device: Command to request for device managed by TISCI
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* Returns 0 for successful exclusive request, else returns
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* corresponding error message.
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* @idle_device: Command to idle a device managed by TISCI
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* Returns 0 for successful exclusive request, else returns
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* corresponding error message.
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* @put_device: Command to release a device managed by TISCI
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* Returns 0 for successful release, else returns corresponding
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* error message.
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* @is_valid: Check if the device ID is a valid ID.
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* Returns 0 if the ID is valid, else returns corresponding error.
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* @get_context_loss_count: Command to retrieve context loss counter - this
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* increments every time the device looses context. Overflow
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* is possible.
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* - count: pointer to u32 which will retrieve counter
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* Returns 0 for successful information request and count has
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* proper data, else returns corresponding error message.
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* @is_idle: Reports back about device idle state
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* - req_state: Returns requested idle state
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* Returns 0 for successful information request and req_state and
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* current_state has proper data, else returns corresponding error
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* message.
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* @is_stop: Reports back about device stop state
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* - req_state: Returns requested stop state
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* - current_state: Returns current stop state
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* Returns 0 for successful information request and req_state and
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* current_state has proper data, else returns corresponding error
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* message.
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* @is_on: Reports back about device ON(or active) state
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* - req_state: Returns requested ON state
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* - current_state: Returns current ON state
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* Returns 0 for successful information request and req_state and
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* current_state has proper data, else returns corresponding error
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* message.
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* @is_transitioning: Reports back if the device is in the middle of transition
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* of state.
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* -current_state: Returns 'true' if currently transitioning.
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* @set_device_resets: Command to configure resets for device managed by TISCI.
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* -reset_state: Device specific reset bit field
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* Returns 0 for successful request, else returns
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* corresponding error message.
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* @get_device_resets: Command to read state of resets for device managed
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* by TISCI.
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* -reset_state: pointer to u32 which will retrieve resets
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* Returns 0 for successful request, else returns
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* corresponding error message.
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*
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* NOTE: for all these functions, the following parameters are generic in
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* nature:
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* -handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
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* -id: Device Identifier
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*
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* Request for the device - NOTE: the client MUST maintain integrity of
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* usage count by balancing get_device with put_device. No refcounting is
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* managed by driver for that purpose.
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*/
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struct ti_sci_dev_ops {
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int (*get_device)(const struct ti_sci_handle *handle, u32 id);
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int (*idle_device)(const struct ti_sci_handle *handle, u32 id);
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int (*put_device)(const struct ti_sci_handle *handle, u32 id);
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int (*is_valid)(const struct ti_sci_handle *handle, u32 id);
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int (*get_context_loss_count)(const struct ti_sci_handle *handle,
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u32 id, u32 *count);
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int (*is_idle)(const struct ti_sci_handle *handle, u32 id,
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bool *requested_state);
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int (*is_stop)(const struct ti_sci_handle *handle, u32 id,
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bool *req_state, bool *current_state);
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int (*is_on)(const struct ti_sci_handle *handle, u32 id,
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bool *req_state, bool *current_state);
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int (*is_transitioning)(const struct ti_sci_handle *handle, u32 id,
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bool *current_state);
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int (*set_device_resets)(const struct ti_sci_handle *handle, u32 id,
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u32 reset_state);
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int (*get_device_resets)(const struct ti_sci_handle *handle, u32 id,
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u32 *reset_state);
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};
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/**
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* struct ti_sci_clk_ops - Clock control operations
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* @get_clock: Request for activation of clock and manage by processor
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* - needs_ssc: 'true' if Spread Spectrum clock is desired.
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* - can_change_freq: 'true' if frequency change is desired.
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* - enable_input_term: 'true' if input termination is desired.
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* @idle_clock: Request for Idling a clock managed by processor
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* @put_clock: Release the clock to be auto managed by TISCI
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* @is_auto: Is the clock being auto managed
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* - req_state: state indicating if the clock is auto managed
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* @is_on: Is the clock ON
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* - req_state: if the clock is requested to be forced ON
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* - current_state: if the clock is currently ON
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* @is_off: Is the clock OFF
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* - req_state: if the clock is requested to be forced OFF
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* - current_state: if the clock is currently Gated
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* @set_parent: Set the clock source of a specific device clock
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* - parent_id: Parent clock identifier to set.
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* @get_parent: Get the current clock source of a specific device clock
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* - parent_id: Parent clock identifier which is the parent.
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* @get_num_parents: Get the number of parents of the current clock source
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* - num_parents: returns the number of parent clocks.
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* @get_best_match_freq: Find a best matching frequency for a frequency
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* range.
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* - match_freq: Best matching frequency in Hz.
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* @set_freq: Set the Clock frequency
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* @get_freq: Get the Clock frequency
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* - current_freq: Frequency in Hz that the clock is at.
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*
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* NOTE: for all these functions, the following parameters are generic in
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* nature:
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* -handle: Pointer to TISCI handle as retrieved by *ti_sci_get_handle
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* -did: Device identifier this request is for
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* -cid: Clock identifier for the device for this request.
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* Each device has it's own set of clock inputs. This indexes
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* which clock input to modify.
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* -min_freq: The minimum allowable frequency in Hz. This is the minimum
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* allowable programmed frequency and does not account for clock
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* tolerances and jitter.
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* -target_freq: The target clock frequency in Hz. A frequency will be
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* processed as close to this target frequency as possible.
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* -max_freq: The maximum allowable frequency in Hz. This is the maximum
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* allowable programmed frequency and does not account for clock
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* tolerances and jitter.
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*
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* Request for the clock - NOTE: the client MUST maintain integrity of
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* usage count by balancing get_clock with put_clock. No refcounting is
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* managed by driver for that purpose.
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*/
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struct ti_sci_clk_ops {
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int (*get_clock)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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bool needs_ssc, bool can_change_freq,
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bool enable_input_term);
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int (*idle_clock)(const struct ti_sci_handle *handle, u32 did, u8 cid);
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int (*put_clock)(const struct ti_sci_handle *handle, u32 did, u8 cid);
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int (*is_auto)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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bool *req_state);
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int (*is_on)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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bool *req_state, bool *current_state);
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int (*is_off)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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bool *req_state, bool *current_state);
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int (*set_parent)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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u8 parent_id);
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int (*get_parent)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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u8 *parent_id);
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int (*get_num_parents)(const struct ti_sci_handle *handle, u32 did,
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u8 cid, u8 *num_parents);
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int (*get_best_match_freq)(const struct ti_sci_handle *handle, u32 did,
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u8 cid, u64 min_freq, u64 target_freq,
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u64 max_freq, u64 *match_freq);
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int (*set_freq)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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u64 min_freq, u64 target_freq, u64 max_freq);
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int (*get_freq)(const struct ti_sci_handle *handle, u32 did, u8 cid,
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u64 *current_freq);
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};
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/**
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* struct ti_sci_ops - Function support for TI SCI
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* @dev_ops: Device specific operations
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* @clk_ops: Clock specific operations
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*/
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struct ti_sci_ops {
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struct ti_sci_core_ops core_ops;
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struct ti_sci_dev_ops dev_ops;
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struct ti_sci_clk_ops clk_ops;
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};
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/**
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* struct ti_sci_handle - Handle returned to TI SCI clients for usage.
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* @version: structure containing version information
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* @ops: operations that are made available to TI SCI clients
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*/
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struct ti_sci_handle {
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struct ti_sci_version_info version;
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struct ti_sci_ops ops;
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};
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#if IS_ENABLED(CONFIG_TI_SCI_PROTOCOL)
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const struct ti_sci_handle *ti_sci_get_handle(struct device *dev);
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int ti_sci_put_handle(const struct ti_sci_handle *handle);
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const struct ti_sci_handle *devm_ti_sci_get_handle(struct device *dev);
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#else /* CONFIG_TI_SCI_PROTOCOL */
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static inline const struct ti_sci_handle *ti_sci_get_handle(struct device *dev)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline int ti_sci_put_handle(const struct ti_sci_handle *handle)
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{
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return -EINVAL;
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}
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static inline
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const struct ti_sci_handle *devm_ti_sci_get_handle(struct device *dev)
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{
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return ERR_PTR(-EINVAL);
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}
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#endif /* CONFIG_TI_SCI_PROTOCOL */
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#endif /* __TISCI_PROTOCOL_H */
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