mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-24 03:53:31 +00:00
c52cd07407
At the moment, we don't have a common API for working with SM, only the smc_call() function. This approach is not generic and difficult to configure and maintain. This patch adds UCLASS_SM with the generic API: - sm_call() - sm_call_write() - sm_call_read() These functions operate with struct pt_regs, which describes Secure Monitor arguments. Signed-off-by: Alexey Romanov <avromanov@salutedevices.com> Reviewed-by: Simon Glass <sjg@chromium.org> Link: https://lore.kernel.org/r/20230921081346.22157-2-avromanov@salutedevices.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (c) 2023 SberDevices, Inc.
|
|
*
|
|
* Author: Alexey Romanov <avromanov@salutedevices.ru>
|
|
*/
|
|
|
|
#ifndef __SM_H__
|
|
#define __SM_H__
|
|
|
|
/*
|
|
* NOTE: UCLASS_SM is designed with the idea that
|
|
* each driver should convert @cmd to some raw
|
|
* value, which is known only for driver, and set this
|
|
* value to the first element of the @args->regs array.
|
|
* Therefore, it is necessary to pass the remaining
|
|
* arguments starting at index = 1. Anyway, driver
|
|
* implementation may vary, so, please, check the specific
|
|
* implementation of the driver you are using.
|
|
*/
|
|
|
|
#include <asm/types.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
struct udevice;
|
|
|
|
/**
|
|
* sm_call - generic SMC call to the secure-monitor
|
|
*
|
|
* @dev: Pointer to UCLASS_SM device
|
|
* @cmd_index: Index of the SMC function ID
|
|
* @smc_ret: Returned value from secure world
|
|
* @args: SMC arguments
|
|
*
|
|
* @return: 0 on success, a negative value on error
|
|
*/
|
|
int sm_call(struct udevice *dev, u32 cmd, s32 *ret, struct pt_regs *args);
|
|
|
|
/**
|
|
* sm_call_read - retrieve data from secure-monitor
|
|
*
|
|
* @dev: Pointer to UCLASS_MESON_SM device
|
|
* @buffer: Buffer to store the retrieved data
|
|
* @size: Size of the buffer
|
|
* @cmd: Index of the SMC function ID
|
|
* @args: SMC arguments
|
|
*
|
|
* @return: size of read data on success, a negative value on error
|
|
*/
|
|
int sm_call_read(struct udevice *dev, void *buffer, size_t size,
|
|
u32 cmd, struct pt_regs *args);
|
|
|
|
/**
|
|
* sm_call_write - send data to secure-monitor
|
|
*
|
|
* @dev: Pointer to UCLASS_SM device
|
|
* @buffer: Buffer containing data to send
|
|
* @size: Size of the buffer
|
|
* @cmd: Index of the SMC function ID
|
|
* @args: SMC arguments
|
|
*
|
|
* @return: size of sent data on success, a negative value on error
|
|
*/
|
|
int sm_call_write(struct udevice *dev, void *buffer, size_t size,
|
|
u32 cmd, struct pt_regs *args);
|
|
|
|
#endif /* __SM_H__ */
|