forked from Minki/linux
aa90ac45bc
Instead of type-casting the {tx,rx}.buf all over the place while
accessing them to read/write __le{32,64} from/to the firmware, let's
use the existing {get,put}_unaligned_le{32,64} accessors to hide all
the type cast ugliness.
Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* System Control and Management Interface (SCMI) Message Protocol
|
|
* driver common header file containing some definitions, structures
|
|
* and function prototypes used in all the different SCMI protocols.
|
|
*
|
|
* Copyright (C) 2018 ARM Ltd.
|
|
*/
|
|
|
|
#include <linux/bitfield.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/device.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/scmi_protocol.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/unaligned.h>
|
|
|
|
#define PROTOCOL_REV_MINOR_MASK GENMASK(15, 0)
|
|
#define PROTOCOL_REV_MAJOR_MASK GENMASK(31, 16)
|
|
#define PROTOCOL_REV_MAJOR(x) (u16)(FIELD_GET(PROTOCOL_REV_MAJOR_MASK, (x)))
|
|
#define PROTOCOL_REV_MINOR(x) (u16)(FIELD_GET(PROTOCOL_REV_MINOR_MASK, (x)))
|
|
#define MAX_PROTOCOLS_IMP 16
|
|
#define MAX_OPPS 16
|
|
|
|
enum scmi_common_cmd {
|
|
PROTOCOL_VERSION = 0x0,
|
|
PROTOCOL_ATTRIBUTES = 0x1,
|
|
PROTOCOL_MESSAGE_ATTRIBUTES = 0x2,
|
|
};
|
|
|
|
/**
|
|
* struct scmi_msg_resp_prot_version - Response for a message
|
|
*
|
|
* @major_version: Major version of the ABI that firmware supports
|
|
* @minor_version: 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 SCMI_MSG_VERSION
|
|
*/
|
|
struct scmi_msg_resp_prot_version {
|
|
__le16 minor_version;
|
|
__le16 major_version;
|
|
};
|
|
|
|
/**
|
|
* struct scmi_msg_hdr - Message(Tx/Rx) header
|
|
*
|
|
* @id: The identifier of the message being sent
|
|
* @protocol_id: The identifier of the protocol used to send @id message
|
|
* @seq: The token to identify the message. When a message returns, the
|
|
* platform returns the whole message header unmodified including the
|
|
* token
|
|
* @status: Status of the transfer once it's complete
|
|
* @poll_completion: Indicate if the transfer needs to be polled for
|
|
* completion or interrupt mode is used
|
|
*/
|
|
struct scmi_msg_hdr {
|
|
u8 id;
|
|
u8 protocol_id;
|
|
u16 seq;
|
|
u32 status;
|
|
bool poll_completion;
|
|
};
|
|
|
|
/**
|
|
* struct scmi_msg - Message(Tx/Rx) structure
|
|
*
|
|
* @buf: Buffer pointer
|
|
* @len: Length of data in the Buffer
|
|
*/
|
|
struct scmi_msg {
|
|
void *buf;
|
|
size_t len;
|
|
};
|
|
|
|
/**
|
|
* struct scmi_xfer - Structure representing a message flow
|
|
*
|
|
* @hdr: Transmit message header
|
|
* @tx: Transmit message
|
|
* @rx: Receive message, the buffer should be pre-allocated to store
|
|
* message. If request-ACK protocol is used, we can reuse the same
|
|
* buffer for the rx path as we use for the tx path.
|
|
* @done: command message transmit completion event
|
|
* @async: pointer to delayed response message received event completion
|
|
*/
|
|
struct scmi_xfer {
|
|
struct scmi_msg_hdr hdr;
|
|
struct scmi_msg tx;
|
|
struct scmi_msg rx;
|
|
struct completion done;
|
|
struct completion *async_done;
|
|
};
|
|
|
|
void scmi_xfer_put(const struct scmi_handle *h, struct scmi_xfer *xfer);
|
|
int scmi_do_xfer(const struct scmi_handle *h, struct scmi_xfer *xfer);
|
|
int scmi_do_xfer_with_response(const struct scmi_handle *h,
|
|
struct scmi_xfer *xfer);
|
|
int scmi_xfer_get_init(const struct scmi_handle *h, u8 msg_id, u8 prot_id,
|
|
size_t tx_size, size_t rx_size, struct scmi_xfer **p);
|
|
int scmi_handle_put(const struct scmi_handle *handle);
|
|
struct scmi_handle *scmi_handle_get(struct device *dev);
|
|
void scmi_set_handle(struct scmi_device *scmi_dev);
|
|
int scmi_version_get(const struct scmi_handle *h, u8 protocol, u32 *version);
|
|
void scmi_setup_protocol_implemented(const struct scmi_handle *handle,
|
|
u8 *prot_imp);
|
|
|
|
int scmi_base_protocol_init(struct scmi_handle *h);
|