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/* 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 <linux/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__ */ |