| Alexey Romanov | c52cd07 | 2023-09-21 11:13:34 +0300 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
| 2 | /* |
| 3 | * Copyright (c) 2023 SberDevices, Inc. |
| 4 | * |
| 5 | * Author: Alexey Romanov <avromanov@salutedevices.com> |
| 6 | */ |
| 7 | |
| 8 | #ifndef __SM_UCLASS_H__ |
| 9 | #define __SM_UCLASS_H__ |
| 10 | |
| 11 | #include <asm/types.h> |
| 12 | #include <asm/ptrace.h> |
| 13 | |
| 14 | struct udevice; |
| 15 | |
| 16 | /** |
| 17 | * struct sm_ops - The functions that a SM driver must implement. |
| 18 | * |
| 19 | * @sm_call: Request a secure monitor call with specified command. |
| 20 | * |
| 21 | * @sm_call_read: Request a secure monitor call and retrieve data |
| 22 | * from secure-monitor (depends on specified command). |
| 23 | * |
| 24 | * @sm_call_write: Request a secure monitor call and send data |
| 25 | * to secure-monitor (depends on specified command). |
| 26 | * |
| 27 | * The individual methods are described more fully below. |
| 28 | */ |
| 29 | struct sm_ops { |
| 30 | /** |
| 31 | * sm_call - generic SMC call to the secure-monitor |
| 32 | * |
| 33 | * @dev: Pointer to UCLASS_SM device |
| 34 | * @cmd_index: Index of the SMC function ID |
| 35 | * @smc_ret: Returned value from secure world |
| 36 | * @args: SMC arguments |
| 37 | * |
| 38 | * @return: 0 on success, a negative value on error |
| 39 | */ |
| 40 | int (*sm_call)(struct udevice *dev, u32 cmd, s32 *smc_ret, |
| 41 | struct pt_regs *args); |
| 42 | |
| 43 | /** |
| 44 | * sm_call_write - send data to secure-monitor |
| 45 | * |
| 46 | * @dev: Pointer to UCLASS_SM device |
| 47 | * @buffer: Buffer containing data to send |
| 48 | * @size: Size of the buffer |
| 49 | * @cmd: Index of the SMC function ID |
| 50 | * @args: SMC arguments |
| 51 | * |
| 52 | * @return: size of sent data on success, a negative value on error |
| 53 | */ |
| 54 | int (*sm_call_write)(struct udevice *dev, void *buffer, |
| 55 | size_t size, u32 cmd, struct pt_regs *args); |
| 56 | |
| 57 | /** |
| 58 | * sm_call_read - retrieve data from secure-monitor |
| 59 | * |
| 60 | * @dev: Pointer to UCLASS_SM device |
| 61 | * @buffer: Buffer to store the retrieved data |
| 62 | * @size: Size of the buffer |
| 63 | * @cmd: Index of the SMC function ID |
| 64 | * @args: SMC arguments |
| 65 | * |
| 66 | * @return: size of read data on success, a negative value on error |
| 67 | */ |
| 68 | int (*sm_call_read)(struct udevice *dev, void *buffer, |
| 69 | size_t size, u32 cmd, struct pt_regs *args); |
| 70 | }; |
| 71 | |
| 72 | #endif /* __SM_UCLASS_H__ */ |