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linux/drivers/firmware/ti_sci.h
Nishanth Menon 912cffb4ed firmware: ti_sci: Add support for reboot core service 
Since system controller now has control over SoC power management, it
needs to be explicitly requested to reboot the SoC. Add support for
it.

In some systems however, SoC needs to toggle a GPIO or send event to an
external entity (like a PMIC) for a system reboot to take place. To
facilitate that, we allow for a DT property to determine if the reboot
handler will be registered and further, the service is also made
available to other drivers (such as PMIC driver) to sequence the
additional operation and trigger the SoC reboot as the last step.

Tested-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
2016-10-27 12:09:12 +03:00

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/*
* Texas Instruments System Control Interface (TISCI) Protocol
*
* Communication protocol with TI SCI hardware
* The system works in a message response protocol
* See: http://processors.wiki.ti.com/index.php/TISCI for details
*
* Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef __TI_SCI_H
#define __TI_SCI_H
/* Generic Messages */
#define TI_SCI_MSG_ENABLE_WDT 0x0000
#define TI_SCI_MSG_WAKE_RESET 0x0001
#define TI_SCI_MSG_VERSION 0x0002
#define TI_SCI_MSG_WAKE_REASON 0x0003
#define TI_SCI_MSG_GOODBYE 0x0004
#define TI_SCI_MSG_SYS_RESET 0x0005
/* Device requests */
#define TI_SCI_MSG_SET_DEVICE_STATE 0x0200
#define TI_SCI_MSG_GET_DEVICE_STATE 0x0201
#define TI_SCI_MSG_SET_DEVICE_RESETS 0x0202
/* Clock requests */
#define TI_SCI_MSG_SET_CLOCK_STATE 0x0100
#define TI_SCI_MSG_GET_CLOCK_STATE 0x0101
#define TI_SCI_MSG_SET_CLOCK_PARENT 0x0102
#define TI_SCI_MSG_GET_CLOCK_PARENT 0x0103
#define TI_SCI_MSG_GET_NUM_CLOCK_PARENTS 0x0104
#define TI_SCI_MSG_SET_CLOCK_FREQ 0x010c
#define TI_SCI_MSG_QUERY_CLOCK_FREQ 0x010d
#define TI_SCI_MSG_GET_CLOCK_FREQ 0x010e
/**
* struct ti_sci_msg_hdr - Generic Message Header for All messages and responses
* @type: Type of messages: One of TI_SCI_MSG* values
* @host: Host of the message
* @seq: Message identifier indicating a transfer sequence
* @flags: Flag for the message
*/
struct ti_sci_msg_hdr {
u16 type;
u8 host;
u8 seq;
#define TI_SCI_MSG_FLAG(val) (1 << (val))
#define TI_SCI_FLAG_REQ_GENERIC_NORESPONSE 0x0
#define TI_SCI_FLAG_REQ_ACK_ON_RECEIVED TI_SCI_MSG_FLAG(0)
#define TI_SCI_FLAG_REQ_ACK_ON_PROCESSED TI_SCI_MSG_FLAG(1)
#define TI_SCI_FLAG_RESP_GENERIC_NACK 0x0
#define TI_SCI_FLAG_RESP_GENERIC_ACK TI_SCI_MSG_FLAG(1)
/* Additional Flags */
u32 flags;
} __packed;
/**
* struct ti_sci_msg_resp_version - Response for a message
* @hdr: Generic header
* @firmware_description: String describing the firmware
* @firmware_revision: Firmware revision
* @abi_major: Major version of the ABI that firmware supports
* @abi_minor: Minor version of the ABI that firmware supports
*
* In general, ABI version changes follow the rule that minor version increments
* are backward compatible. Major revision changes in ABI may not be
* backward compatible.
*
* Response to a generic message with message type TI_SCI_MSG_VERSION
*/
struct ti_sci_msg_resp_version {
struct ti_sci_msg_hdr hdr;
char firmware_description[32];
u16 firmware_revision;
u8 abi_major;
u8 abi_minor;
} __packed;
/**
* struct ti_sci_msg_req_reboot - Reboot the SoC
* @hdr: Generic Header
*
* Request type is TI_SCI_MSG_SYS_RESET, responded with a generic
* ACK/NACK message.
*/
struct ti_sci_msg_req_reboot {
struct ti_sci_msg_hdr hdr;
} __packed;
/**
* struct ti_sci_msg_req_set_device_state - Set the desired state of the device
* @hdr: Generic header
* @id: Indicates which device to modify
* @reserved: Reserved space in message, must be 0 for backward compatibility
* @state: The desired state of the device.
*
* Certain flags can also be set to alter the device state:
* + MSG_FLAG_DEVICE_WAKE_ENABLED - Configure the device to be a wake source.
* The meaning of this flag will vary slightly from device to device and from
* SoC to SoC but it generally allows the device to wake the SoC out of deep
* suspend states.
* + MSG_FLAG_DEVICE_RESET_ISO - Enable reset isolation for this device.
* + MSG_FLAG_DEVICE_EXCLUSIVE - Claim this device exclusively. When passed
* with STATE_RETENTION or STATE_ON, it will claim the device exclusively.
* If another host already has this device set to STATE_RETENTION or STATE_ON,
* the message will fail. Once successful, other hosts attempting to set
* STATE_RETENTION or STATE_ON will fail.
*
* Request type is TI_SCI_MSG_SET_DEVICE_STATE, responded with a generic
* ACK/NACK message.
*/
struct ti_sci_msg_req_set_device_state {
/* Additional hdr->flags options */
#define MSG_FLAG_DEVICE_WAKE_ENABLED TI_SCI_MSG_FLAG(8)
#define MSG_FLAG_DEVICE_RESET_ISO TI_SCI_MSG_FLAG(9)
#define MSG_FLAG_DEVICE_EXCLUSIVE TI_SCI_MSG_FLAG(10)
struct ti_sci_msg_hdr hdr;
u32 id;
u32 reserved;
#define MSG_DEVICE_SW_STATE_AUTO_OFF 0
#define MSG_DEVICE_SW_STATE_RETENTION 1
#define MSG_DEVICE_SW_STATE_ON 2
u8 state;
} __packed;
/**
* struct ti_sci_msg_req_get_device_state - Request to get device.
* @hdr: Generic header
* @id: Device Identifier
*
* Request type is TI_SCI_MSG_GET_DEVICE_STATE, responded device state
* information
*/
struct ti_sci_msg_req_get_device_state {
struct ti_sci_msg_hdr hdr;
u32 id;
} __packed;
/**
* struct ti_sci_msg_resp_get_device_state - Response to get device request.
* @hdr: Generic header
* @context_loss_count: Indicates how many times the device has lost context. A
* driver can use this monotonic counter to determine if the device has
* lost context since the last time this message was exchanged.
* @resets: Programmed state of the reset lines.
* @programmed_state: The state as programmed by set_device.
* - Uses the MSG_DEVICE_SW_* macros
* @current_state: The actual state of the hardware.
*
* Response to request TI_SCI_MSG_GET_DEVICE_STATE.
*/
struct ti_sci_msg_resp_get_device_state {
struct ti_sci_msg_hdr hdr;
u32 context_loss_count;
u32 resets;
u8 programmed_state;
#define MSG_DEVICE_HW_STATE_OFF 0
#define MSG_DEVICE_HW_STATE_ON 1
#define MSG_DEVICE_HW_STATE_TRANS 2
u8 current_state;
} __packed;
/**
* struct ti_sci_msg_req_set_device_resets - Set the desired resets
* configuration of the device
* @hdr: Generic header
* @id: Indicates which device to modify
* @resets: A bit field of resets for the device. The meaning, behavior,
* and usage of the reset flags are device specific. 0 for a bit
* indicates releasing the reset represented by that bit while 1
* indicates keeping it held.
*
* Request type is TI_SCI_MSG_SET_DEVICE_RESETS, responded with a generic
* ACK/NACK message.
*/
struct ti_sci_msg_req_set_device_resets {
struct ti_sci_msg_hdr hdr;
u32 id;
u32 resets;
} __packed;
/**
* struct ti_sci_msg_req_set_clock_state - Request to setup a Clock state
* @hdr: Generic Header, Certain flags can be set specific to the clocks:
* MSG_FLAG_CLOCK_ALLOW_SSC: Allow this clock to be modified
* via spread spectrum clocking.
* MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE: Allow this clock's
* frequency to be changed while it is running so long as it
* is within the min/max limits.
* MSG_FLAG_CLOCK_INPUT_TERM: Enable input termination, this
* is only applicable to clock inputs on the SoC pseudo-device.
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @request_state: Request the state for the clock to be set to.
* MSG_CLOCK_SW_STATE_UNREQ: The IP does not require this clock,
* it can be disabled, regardless of the state of the device
* MSG_CLOCK_SW_STATE_AUTO: Allow the System Controller to
* automatically manage the state of this clock. If the device
* is enabled, then the clock is enabled. If the device is set
* to off or retention, then the clock is internally set as not
* being required by the device.(default)
* MSG_CLOCK_SW_STATE_REQ: Configure the clock to be enabled,
* regardless of the state of the device.
*
* Normally, all required clocks are managed by TISCI entity, this is used
* only for specific control *IF* required. Auto managed state is
* MSG_CLOCK_SW_STATE_AUTO, in other states, TISCI entity assume remote
* will explicitly control.
*
* Request type is TI_SCI_MSG_SET_CLOCK_STATE, response is a generic
* ACK or NACK message.
*/
struct ti_sci_msg_req_set_clock_state {
/* Additional hdr->flags options */
#define MSG_FLAG_CLOCK_ALLOW_SSC TI_SCI_MSG_FLAG(8)
#define MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE TI_SCI_MSG_FLAG(9)
#define MSG_FLAG_CLOCK_INPUT_TERM TI_SCI_MSG_FLAG(10)
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u8 clk_id;
#define MSG_CLOCK_SW_STATE_UNREQ 0
#define MSG_CLOCK_SW_STATE_AUTO 1
#define MSG_CLOCK_SW_STATE_REQ 2
u8 request_state;
} __packed;
/**
* struct ti_sci_msg_req_get_clock_state - Request for clock state
* @hdr: Generic Header
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to get state of.
*
* Request type is TI_SCI_MSG_GET_CLOCK_STATE, response is state
* of the clock
*/
struct ti_sci_msg_req_get_clock_state {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u8 clk_id;
} __packed;
/**
* struct ti_sci_msg_resp_get_clock_state - Response to get clock state
* @hdr: Generic Header
* @programmed_state: Any programmed state of the clock. This is one of
* MSG_CLOCK_SW_STATE* values.
* @current_state: Current state of the clock. This is one of:
* MSG_CLOCK_HW_STATE_NOT_READY: Clock is not ready
* MSG_CLOCK_HW_STATE_READY: Clock is ready
*
* Response to TI_SCI_MSG_GET_CLOCK_STATE.
*/
struct ti_sci_msg_resp_get_clock_state {
struct ti_sci_msg_hdr hdr;
u8 programmed_state;
#define MSG_CLOCK_HW_STATE_NOT_READY 0
#define MSG_CLOCK_HW_STATE_READY 1
u8 current_state;
} __packed;
/**
* struct ti_sci_msg_req_set_clock_parent - Set the clock parent
* @hdr: Generic Header
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to modify.
* @parent_id: The new clock parent is selectable by an index via this
* parameter.
*
* Request type is TI_SCI_MSG_SET_CLOCK_PARENT, response is generic
* ACK / NACK message.
*/
struct ti_sci_msg_req_set_clock_parent {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u8 clk_id;
u8 parent_id;
} __packed;
/**
* struct ti_sci_msg_req_get_clock_parent - Get the clock parent
* @hdr: Generic Header
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
* Each device has it's own set of clock inputs. This indexes
* which clock input to get the parent for.
*
* Request type is TI_SCI_MSG_GET_CLOCK_PARENT, response is parent information
*/
struct ti_sci_msg_req_get_clock_parent {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u8 clk_id;
} __packed;
/**
* struct ti_sci_msg_resp_get_clock_parent - Response with clock parent
* @hdr: Generic Header
* @parent_id: The current clock parent
*
* Response to TI_SCI_MSG_GET_CLOCK_PARENT.
*/
struct ti_sci_msg_resp_get_clock_parent {
struct ti_sci_msg_hdr hdr;
u8 parent_id;
} __packed;
/**
* struct ti_sci_msg_req_get_clock_num_parents - Request to get clock parents
* @hdr: Generic header
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
*
* This request provides information about how many clock parent options
* are available for a given clock to a device. This is typically used
* for input clocks.
*
* Request type is TI_SCI_MSG_GET_NUM_CLOCK_PARENTS, response is appropriate
* message, or NACK in case of inability to satisfy request.
*/
struct ti_sci_msg_req_get_clock_num_parents {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u8 clk_id;
} __packed;
/**
* struct ti_sci_msg_resp_get_clock_num_parents - Response for get clk parents
* @hdr: Generic header
* @num_parents: Number of clock parents
*
* Response to TI_SCI_MSG_GET_NUM_CLOCK_PARENTS
*/
struct ti_sci_msg_resp_get_clock_num_parents {
struct ti_sci_msg_hdr hdr;
u8 num_parents;
} __packed;
/**
* struct ti_sci_msg_req_query_clock_freq - Request to query a frequency
* @hdr: Generic Header
* @dev_id: Device identifier this request is for
* @min_freq_hz: The minimum allowable frequency in Hz. This is the minimum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @target_freq_hz: The target clock frequency. A frequency will be found
* as close to this target frequency as possible.
* @max_freq_hz: The maximum allowable frequency in Hz. This is the maximum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @clk_id: Clock identifier for the device for this request.
*
* NOTE: Normally clock frequency management is automatically done by TISCI
* entity. In case of specific requests, TISCI evaluates capability to achieve
* requested frequency within provided range and responds with
* result message.
*
* Request type is TI_SCI_MSG_QUERY_CLOCK_FREQ, response is appropriate message,
* or NACK in case of inability to satisfy request.
*/
struct ti_sci_msg_req_query_clock_freq {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u64 min_freq_hz;
u64 target_freq_hz;
u64 max_freq_hz;
u8 clk_id;
} __packed;
/**
* struct ti_sci_msg_resp_query_clock_freq - Response to a clock frequency query
* @hdr: Generic Header
* @freq_hz: Frequency that is the best match in Hz.
*
* Response to request type TI_SCI_MSG_QUERY_CLOCK_FREQ. NOTE: if the request
* cannot be satisfied, the message will be of type NACK.
*/
struct ti_sci_msg_resp_query_clock_freq {
struct ti_sci_msg_hdr hdr;
u64 freq_hz;
} __packed;
/**
* struct ti_sci_msg_req_set_clock_freq - Request to setup a clock frequency
* @hdr: Generic Header
* @dev_id: Device identifier this request is for
* @min_freq_hz: The minimum allowable frequency in Hz. This is the minimum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @target_freq_hz: The target clock frequency. The clock will be programmed
* at a rate as close to this target frequency as possible.
* @max_freq_hz: The maximum allowable frequency in Hz. This is the maximum
* allowable programmed frequency and does not account for clock
* tolerances and jitter.
* @clk_id: Clock identifier for the device for this request.
*
* NOTE: Normally clock frequency management is automatically done by TISCI
* entity. In case of specific requests, TISCI evaluates capability to achieve
* requested range and responds with success/failure message.
*
* This sets the desired frequency for a clock within an allowable
* range. This message will fail on an enabled clock unless
* MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE is set for the clock. Additionally,
* if other clocks have their frequency modified due to this message,
* they also must have the MSG_FLAG_CLOCK_ALLOW_FREQ_CHANGE or be disabled.
*
* Calling set frequency on a clock input to the SoC pseudo-device will
* inform the PMMC of that clock's frequency. Setting a frequency of
* zero will indicate the clock is disabled.
*
* Calling set frequency on clock outputs from the SoC pseudo-device will
* function similarly to setting the clock frequency on a device.
*
* Request type is TI_SCI_MSG_SET_CLOCK_FREQ, response is a generic ACK/NACK
* message.
*/
struct ti_sci_msg_req_set_clock_freq {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u64 min_freq_hz;
u64 target_freq_hz;
u64 max_freq_hz;
u8 clk_id;
} __packed;
/**
* struct ti_sci_msg_req_get_clock_freq - Request to get the clock frequency
* @hdr: Generic Header
* @dev_id: Device identifier this request is for
* @clk_id: Clock identifier for the device for this request.
*
* NOTE: Normally clock frequency management is automatically done by TISCI
* entity. In some cases, clock frequencies are configured by host.
*
* Request type is TI_SCI_MSG_GET_CLOCK_FREQ, responded with clock frequency
* that the clock is currently at.
*/
struct ti_sci_msg_req_get_clock_freq {
struct ti_sci_msg_hdr hdr;
u32 dev_id;
u8 clk_id;
} __packed;
/**
* struct ti_sci_msg_resp_get_clock_freq - Response of clock frequency request
* @hdr: Generic Header
* @freq_hz: Frequency that the clock is currently on, in Hz.
*
* Response to request type TI_SCI_MSG_GET_CLOCK_FREQ.
*/
struct ti_sci_msg_resp_get_clock_freq {
struct ti_sci_msg_hdr hdr;
u64 freq_hz;
} __packed;
#endif /* __TI_SCI_H */
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