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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>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2023 SberDevices, Inc.
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*
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* Author: Alexey Romanov <avromanov@salutedevices.ru>
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*/
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#ifndef __SM_H__
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#define __SM_H__
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/*
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* NOTE: UCLASS_SM is designed with the idea that
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* each driver should convert @cmd to some raw
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* value, which is known only for driver, and set this
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* value to the first element of the @args->regs array.
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* Therefore, it is necessary to pass the remaining
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* arguments starting at index = 1. Anyway, driver
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* implementation may vary, so, please, check the specific
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* implementation of the driver you are using.
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*/
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#include <asm/types.h>
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#include <asm/ptrace.h>
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struct udevice;
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/**
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* sm_call - generic SMC call to the secure-monitor
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*
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* @dev: Pointer to UCLASS_SM device
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* @cmd_index: Index of the SMC function ID
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* @smc_ret: Returned value from secure world
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* @args: SMC arguments
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*
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* @return: 0 on success, a negative value on error
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*/
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int sm_call(struct udevice *dev, u32 cmd, s32 *ret, struct pt_regs *args);
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/**
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* sm_call_read - retrieve data from secure-monitor
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*
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* @dev: Pointer to UCLASS_MESON_SM device
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* @buffer: Buffer to store the retrieved data
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* @size: Size of the buffer
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* @cmd: Index of the SMC function ID
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* @args: SMC arguments
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*
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* @return: size of read data on success, a negative value on error
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*/
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int sm_call_read(struct udevice *dev, void *buffer, size_t size,
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u32 cmd, struct pt_regs *args);
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/**
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* sm_call_write - send data to secure-monitor
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*
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* @dev: Pointer to UCLASS_SM device
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* @buffer: Buffer containing data to send
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* @size: Size of the buffer
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* @cmd: Index of the SMC function ID
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* @args: SMC arguments
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*
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* @return: size of sent data on success, a negative value on error
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*/
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int sm_call_write(struct udevice *dev, void *buffer, size_t size,
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u32 cmd, struct pt_regs *args);
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#endif /* __SM_H__ */
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