465 lines
16 KiB
C
465 lines
16 KiB
C
// SPDX-License-Identifier: BSD-3-Clause
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/*
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* Texas Instruments System Control Interface (TISCI) Protocol
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*
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* Communication protocol with TI SCI hardware
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* The system works in a message response protocol
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* See: http://processors.wiki.ti.com/index.php/TISCI for details
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*
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* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
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*/
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#ifndef __TI_SCI_H
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#define __TI_SCI_H
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/* Generic Messages */
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#define TI_SCI_MSG_ENABLE_WDT 0x0000
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#define TI_SCI_MSG_WAKE_RESET 0x0001
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#define TI_SCI_MSG_VERSION 0x0002
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#define TI_SCI_MSG_WAKE_REASON 0x0003
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#define TI_SCI_MSG_GOODBYE 0x0004
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#define TI_SCI_MSG_SYS_RESET 0x0005
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/* Device requests */
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#define TI_SCI_MSG_SET_DEVICE_STATE 0x0200
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#define TI_SCI_MSG_GET_DEVICE_STATE 0x0201
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#define TI_SCI_MSG_SET_DEVICE_RESETS 0x0202
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/* Clock requests */
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#define TI_SCI_MSG_SET_CLOCK_STATE 0x0100
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#define TI_SCI_MSG_GET_CLOCK_STATE 0x0101
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#define TI_SCI_MSG_SET_CLOCK_PARENT 0x0102
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#define TI_SCI_MSG_GET_CLOCK_PARENT 0x0103
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#define TI_SCI_MSG_GET_NUM_CLOCK_PARENTS 0x0104
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#define TI_SCI_MSG_SET_CLOCK_FREQ 0x010c
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#define TI_SCI_MSG_QUERY_CLOCK_FREQ 0x010d
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#define TI_SCI_MSG_GET_CLOCK_FREQ 0x010e
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/**
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* struct ti_sci_msg_hdr - Generic Message Header for All messages and responses
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* @type: Type of messages: One of TI_SCI_MSG* values
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* @host: Host of the message
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* @seq: Message identifier indicating a transfer sequence
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* @flags: Flag for the message
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*/
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struct ti_sci_msg_hdr {
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u16 type;
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u8 host;
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u8 seq;
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#define TI_SCI_MSG_FLAG(val) (1 << (val))
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#define TI_SCI_FLAG_REQ_GENERIC_NORESPONSE 0x0
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#define TI_SCI_FLAG_REQ_ACK_ON_RECEIVED TI_SCI_MSG_FLAG(0)
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#define TI_SCI_FLAG_REQ_ACK_ON_PROCESSED TI_SCI_MSG_FLAG(1)
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#define TI_SCI_FLAG_RESP_GENERIC_NACK 0x0
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#define TI_SCI_FLAG_RESP_GENERIC_ACK TI_SCI_MSG_FLAG(1)
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/* Additional Flags */
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u32 flags;
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} __packed;
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/**
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* struct ti_sci_msg_resp_version - Response for a message
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* @hdr: Generic header
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* @firmware_description: String describing the firmware
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* @firmware_revision: Firmware revision
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* @abi_major: Major version of the ABI that firmware supports
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* @abi_minor: Minor version of the ABI that firmware supports
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*
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* In general, ABI version changes follow the rule that minor version increments
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* are backward compatible. Major revision changes in ABI may not be
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* backward compatible.
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*
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* Response to a generic message with message type TI_SCI_MSG_VERSION
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*/
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struct ti_sci_msg_resp_version {
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struct ti_sci_msg_hdr hdr;
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char firmware_description[32];
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u16 firmware_revision;
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u8 abi_major;
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u8 abi_minor;
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} __packed;
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/**
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* struct ti_sci_msg_req_reboot - Reboot the SoC
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* @hdr: Generic Header
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*
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* Request type is TI_SCI_MSG_SYS_RESET, responded with a generic
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* ACK/NACK message.
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*/
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struct ti_sci_msg_req_reboot {
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struct ti_sci_msg_hdr hdr;
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} __packed;
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/**
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* struct ti_sci_msg_req_set_device_state - Set the desired state of the device
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* @hdr: Generic header
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* @id: Indicates which device to modify
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* @reserved: Reserved space in message, must be 0 for backward compatibility
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* @state: The desired state of the device.
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*
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* Certain flags can also be set to alter the device state:
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* + MSG_FLAG_DEVICE_WAKE_ENABLED - Configure the device to be a wake source.
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* The meaning of this flag will vary slightly from device to device and from
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* SoC to SoC but it generally allows the device to wake the SoC out of deep
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* suspend states.
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* + MSG_FLAG_DEVICE_RESET_ISO - Enable reset isolation for this device.
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* + MSG_FLAG_DEVICE_EXCLUSIVE - Claim this device exclusively. When passed
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* with STATE_RETENTION or STATE_ON, it will claim the device exclusively.
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* If another host already has this device set to STATE_RETENTION or STATE_ON,
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* the message will fail. Once successful, other hosts attempting to set
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* STATE_RETENTION or STATE_ON will fail.
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*
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* Request type is TI_SCI_MSG_SET_DEVICE_STATE, responded with a generic
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* ACK/NACK message.
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*/
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struct ti_sci_msg_req_set_device_state {
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/* Additional hdr->flags options */
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#define MSG_FLAG_DEVICE_WAKE_ENABLED TI_SCI_MSG_FLAG(8)
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#define MSG_FLAG_DEVICE_RESET_ISO TI_SCI_MSG_FLAG(9)
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#define MSG_FLAG_DEVICE_EXCLUSIVE TI_SCI_MSG_FLAG(10)
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struct ti_sci_msg_hdr hdr;
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u32 id;
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u32 reserved;
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#define MSG_DEVICE_SW_STATE_AUTO_OFF 0
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#define MSG_DEVICE_SW_STATE_RETENTION 1
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#define MSG_DEVICE_SW_STATE_ON 2
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u8 state;
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} __packed;
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/**
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* struct ti_sci_msg_req_get_device_state - Request to get device.
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* @hdr: Generic header
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* @id: Device Identifier
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*
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* Request type is TI_SCI_MSG_GET_DEVICE_STATE, responded device state
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* information
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*/
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struct ti_sci_msg_req_get_device_state {
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struct ti_sci_msg_hdr hdr;
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u32 id;
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} __packed;
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/**
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* struct ti_sci_msg_resp_get_device_state - Response to get device request.
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* @hdr: Generic header
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* @context_loss_count: Indicates how many times the device has lost context. A
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* driver can use this monotonic counter to determine if the device has
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* lost context since the last time this message was exchanged.
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* @resets: Programmed state of the reset lines.
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* @programmed_state: The state as programmed by set_device.
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* - Uses the MSG_DEVICE_SW_* macros
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* @current_state: The actual state of the hardware.
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*
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* Response to request TI_SCI_MSG_GET_DEVICE_STATE.
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*/
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struct ti_sci_msg_resp_get_device_state {
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struct ti_sci_msg_hdr hdr;
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u32 context_loss_count;
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u32 resets;
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u8 programmed_state;
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#define MSG_DEVICE_HW_STATE_OFF 0
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#define MSG_DEVICE_HW_STATE_ON 1
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#define MSG_DEVICE_HW_STATE_TRANS 2
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u8 current_state;
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} __packed;
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/**
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* struct ti_sci_msg_req_set_device_resets - Set the desired resets
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* configuration of the device
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* @hdr: Generic header
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* @id: Indicates which device to modify
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* @resets: A bit field of resets for the device. The meaning, behavior,
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* and usage of the reset flags are device specific. 0 for a bit
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* indicates releasing the reset represented by that bit while 1
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* indicates keeping it held.
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*
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* Request type is TI_SCI_MSG_SET_DEVICE_RESETS, responded with a generic
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* ACK/NACK message.
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*/
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struct ti_sci_msg_req_set_device_resets {
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struct ti_sci_msg_hdr hdr;
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u32 id;
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u32 resets;
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} __packed;
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/**
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* struct ti_sci_msg_req_set_clock_state - Request to setup a Clock state
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* @hdr: Generic Header, Certain flags can be set specific to the clocks:
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* MSG_FLAG_CLOCK_ALLOW_SSC: Allow this clock to be modified
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* via spread spectrum clocking.
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* MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE: Allow this clock's
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* frequency to be changed while it is running so long as it
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* is within the min/max limits.
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* MSG_FLAG_CLOCK_INPUT_TERM: Enable input termination, this
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* is only applicable to clock inputs on the SoC pseudo-device.
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* @dev_id: Device identifier this request is for
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* @clk_id: 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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* @request_state: Request the state for the clock to be set to.
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* MSG_CLOCK_SW_STATE_UNREQ: The IP does not require this clock,
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* it can be disabled, regardless of the state of the device
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* MSG_CLOCK_SW_STATE_AUTO: Allow the System Controller to
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* automatically manage the state of this clock. If the device
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* is enabled, then the clock is enabled. If the device is set
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* to off or retention, then the clock is internally set as not
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* being required by the device.(default)
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* MSG_CLOCK_SW_STATE_REQ: Configure the clock to be enabled,
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* regardless of the state of the device.
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*
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* Normally, all required clocks are managed by TISCI entity, this is used
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* only for specific control *IF* required. Auto managed state is
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* MSG_CLOCK_SW_STATE_AUTO, in other states, TISCI entity assume remote
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* will explicitly control.
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*
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* Request type is TI_SCI_MSG_SET_CLOCK_STATE, response is a generic
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* ACK or NACK message.
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*/
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struct ti_sci_msg_req_set_clock_state {
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/* Additional hdr->flags options */
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#define MSG_FLAG_CLOCK_ALLOW_SSC TI_SCI_MSG_FLAG(8)
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#define MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE TI_SCI_MSG_FLAG(9)
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#define MSG_FLAG_CLOCK_INPUT_TERM TI_SCI_MSG_FLAG(10)
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u8 clk_id;
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#define MSG_CLOCK_SW_STATE_UNREQ 0
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#define MSG_CLOCK_SW_STATE_AUTO 1
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#define MSG_CLOCK_SW_STATE_REQ 2
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u8 request_state;
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} __packed;
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/**
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* struct ti_sci_msg_req_get_clock_state - Request for clock state
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* @hdr: Generic Header
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* @dev_id: Device identifier this request is for
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* @clk_id: 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 get state of.
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*
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* Request type is TI_SCI_MSG_GET_CLOCK_STATE, response is state
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* of the clock
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*/
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struct ti_sci_msg_req_get_clock_state {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u8 clk_id;
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} __packed;
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/**
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* struct ti_sci_msg_resp_get_clock_state - Response to get clock state
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* @hdr: Generic Header
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* @programmed_state: Any programmed state of the clock. This is one of
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* MSG_CLOCK_SW_STATE* values.
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* @current_state: Current state of the clock. This is one of:
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* MSG_CLOCK_HW_STATE_NOT_READY: Clock is not ready
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* MSG_CLOCK_HW_STATE_READY: Clock is ready
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*
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* Response to TI_SCI_MSG_GET_CLOCK_STATE.
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*/
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struct ti_sci_msg_resp_get_clock_state {
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struct ti_sci_msg_hdr hdr;
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u8 programmed_state;
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#define MSG_CLOCK_HW_STATE_NOT_READY 0
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#define MSG_CLOCK_HW_STATE_READY 1
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u8 current_state;
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} __packed;
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/**
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* struct ti_sci_msg_req_set_clock_parent - Set the clock parent
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* @hdr: Generic Header
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* @dev_id: Device identifier this request is for
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* @clk_id: 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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* @parent_id: The new clock parent is selectable by an index via this
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* parameter.
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*
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* Request type is TI_SCI_MSG_SET_CLOCK_PARENT, response is generic
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* ACK / NACK message.
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*/
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struct ti_sci_msg_req_set_clock_parent {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u8 clk_id;
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u8 parent_id;
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} __packed;
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/**
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* struct ti_sci_msg_req_get_clock_parent - Get the clock parent
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* @hdr: Generic Header
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* @dev_id: Device identifier this request is for
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* @clk_id: 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 get the parent for.
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*
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* Request type is TI_SCI_MSG_GET_CLOCK_PARENT, response is parent information
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*/
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struct ti_sci_msg_req_get_clock_parent {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u8 clk_id;
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} __packed;
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/**
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* struct ti_sci_msg_resp_get_clock_parent - Response with clock parent
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* @hdr: Generic Header
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* @parent_id: The current clock parent
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*
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* Response to TI_SCI_MSG_GET_CLOCK_PARENT.
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*/
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struct ti_sci_msg_resp_get_clock_parent {
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struct ti_sci_msg_hdr hdr;
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u8 parent_id;
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} __packed;
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/**
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* struct ti_sci_msg_req_get_clock_num_parents - Request to get clock parents
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* @hdr: Generic header
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* @dev_id: Device identifier this request is for
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* @clk_id: Clock identifier for the device for this request.
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*
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* This request provides information about how many clock parent options
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* are available for a given clock to a device. This is typically used
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* for input clocks.
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*
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* Request type is TI_SCI_MSG_GET_NUM_CLOCK_PARENTS, response is appropriate
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* message, or NACK in case of inability to satisfy request.
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*/
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struct ti_sci_msg_req_get_clock_num_parents {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u8 clk_id;
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} __packed;
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/**
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* struct ti_sci_msg_resp_get_clock_num_parents - Response for get clk parents
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* @hdr: Generic header
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* @num_parents: Number of clock parents
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*
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* Response to TI_SCI_MSG_GET_NUM_CLOCK_PARENTS
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*/
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struct ti_sci_msg_resp_get_clock_num_parents {
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struct ti_sci_msg_hdr hdr;
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u8 num_parents;
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} __packed;
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/**
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* struct ti_sci_msg_req_query_clock_freq - Request to query a frequency
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* @hdr: Generic Header
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* @dev_id: Device identifier this request is for
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* @min_freq_hz: 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_hz: The target clock frequency. A frequency will be found
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* as close to this target frequency as possible.
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* @max_freq_hz: 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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* @clk_id: Clock identifier for the device for this request.
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*
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* NOTE: Normally clock frequency management is automatically done by TISCI
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* entity. In case of specific requests, TISCI evaluates capability to achieve
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* requested frequency within provided range and responds with
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* result message.
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*
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* Request type is TI_SCI_MSG_QUERY_CLOCK_FREQ, response is appropriate message,
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* or NACK in case of inability to satisfy request.
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*/
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struct ti_sci_msg_req_query_clock_freq {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u64 min_freq_hz;
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u64 target_freq_hz;
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u64 max_freq_hz;
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u8 clk_id;
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} __packed;
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/**
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* struct ti_sci_msg_resp_query_clock_freq - Response to a clock frequency query
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* @hdr: Generic Header
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* @freq_hz: Frequency that is the best match in Hz.
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*
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* Response to request type TI_SCI_MSG_QUERY_CLOCK_FREQ. NOTE: if the request
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* cannot be satisfied, the message will be of type NACK.
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*/
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struct ti_sci_msg_resp_query_clock_freq {
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struct ti_sci_msg_hdr hdr;
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u64 freq_hz;
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} __packed;
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/**
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* struct ti_sci_msg_req_set_clock_freq - Request to setup a clock frequency
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* @hdr: Generic Header
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* @dev_id: Device identifier this request is for
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* @min_freq_hz: 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_hz: The target clock frequency. The clock will be programmed
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* at a rate as close to this target frequency as possible.
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* @max_freq_hz: 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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* @clk_id: Clock identifier for the device for this request.
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*
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* NOTE: Normally clock frequency management is automatically done by TISCI
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* entity. In case of specific requests, TISCI evaluates capability to achieve
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* requested range and responds with success/failure message.
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*
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* This sets the desired frequency for a clock within an allowable
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* range. This message will fail on an enabled clock unless
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* MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE is set for the clock. Additionally,
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* if other clocks have their frequency modified due to this message,
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* they also must have the MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE or be disabled.
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*
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* Calling set frequency on a clock input to the SoC pseudo-device will
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* inform the PMMC of that clock's frequency. Setting a frequency of
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* zero will indicate the clock is disabled.
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*
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* Calling set frequency on clock outputs from the SoC pseudo-device will
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* function similarly to setting the clock frequency on a device.
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*
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* Request type is TI_SCI_MSG_SET_CLOCK_FREQ, response is a generic ACK/NACK
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* message.
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*/
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struct ti_sci_msg_req_set_clock_freq {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u64 min_freq_hz;
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u64 target_freq_hz;
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u64 max_freq_hz;
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u8 clk_id;
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} __packed;
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/**
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* struct ti_sci_msg_req_get_clock_freq - Request to get the clock frequency
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* @hdr: Generic Header
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* @dev_id: Device identifier this request is for
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* @clk_id: Clock identifier for the device for this request.
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*
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* NOTE: Normally clock frequency management is automatically done by TISCI
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* entity. In some cases, clock frequencies are configured by host.
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*
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* Request type is TI_SCI_MSG_GET_CLOCK_FREQ, responded with clock frequency
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* that the clock is currently at.
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*/
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struct ti_sci_msg_req_get_clock_freq {
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struct ti_sci_msg_hdr hdr;
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u32 dev_id;
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u8 clk_id;
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} __packed;
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/**
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* struct ti_sci_msg_resp_get_clock_freq - Response of clock frequency request
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* @hdr: Generic Header
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* @freq_hz: Frequency that the clock is currently on, in Hz.
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*
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* Response to request type TI_SCI_MSG_GET_CLOCK_FREQ.
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*/
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struct ti_sci_msg_resp_get_clock_freq {
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struct ti_sci_msg_hdr hdr;
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u64 freq_hz;
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} __packed;
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#endif /* __TI_SCI_H */
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