projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 39d383bd AEK |
1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* | |
| 3 | * Copyright 2022-2023 Arm Limited and/or its affiliates <open-source-office@arm.com> | |
| 4 | * | |
| 5 | * Authors: | |
| 6 | * Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com> | |
| 7 | */ | |
| 8 | ||
| d678a59d | 9 | #include <common.h> |
| 39d383bd AEK |
10 | #include <arm_ffa.h> |
| 11 | #include <arm_ffa_priv.h> | |
| 12 | #include <dm.h> | |
| 13 | #include <log.h> | |
| 14 | #include <asm/global_data.h> | |
| 15 | #include <dm/device-internal.h> | |
| 16 | #include <linux/errno.h> | |
| 17 | ||
| 18 | DECLARE_GLOBAL_DATA_PTR; | |
| 19 | ||
| 20 | /** | |
| 21 | * invoke_ffa_fn() - SMC wrapper | |
| 22 | * @args: FF-A ABI arguments to be copied to Xn registers | |
| 23 | * @res: FF-A ABI return data to be copied from Xn registers | |
| 24 | * | |
| 25 | * Calls low level SMC assembly function | |
| 26 | */ | |
| 27 | void invoke_ffa_fn(ffa_value_t args, ffa_value_t *res) | |
| 28 | { | |
| 29 | arm_smccc_1_2_smc(&args, res); | |
| 30 | } | |
| 31 | ||
| 32 | /** | |
| 33 | * arm_ffa_discover() - perform FF-A discovery | |
| 34 | * @dev: The Arm FF-A bus device (arm_ffa) | |
| 35 | * Try to discover the FF-A framework. Discovery is performed by | |
| 36 | * querying the FF-A framework version from secure world using the FFA_VERSION ABI. | |
| 37 | * Return: | |
| 38 | * | |
| 39 | * true on success. Otherwise, false. | |
| 40 | */ | |
| 41 | static bool arm_ffa_discover(struct udevice *dev) | |
| 42 | { | |
| 43 | int ret; | |
| 44 | ||
| 67969516 | 45 | log_debug("Arm FF-A framework discovery\n"); |
| 39d383bd AEK |
46 | |
| 47 | ret = ffa_get_version_hdlr(dev); | |
| 48 | if (ret) | |
| 49 | return false; | |
| 50 | ||
| 51 | return true; | |
| 52 | } | |
| 53 | ||
| 54 | /** | |
| 55 | * arm_ffa_is_supported() - FF-A bus discovery callback | |
| 56 | * @invoke_fn: legacy SMC invoke function (not used) | |
| 57 | * | |
| 58 | * Perform FF-A discovery by calling arm_ffa_discover(). | |
| 59 | * Discovery is performed by querying the FF-A framework version from | |
| 60 | * secure world using the FFA_VERSION ABI. | |
| 61 | * | |
| 62 | * The FF-A driver is registered as an SMCCC feature driver. So, features discovery | |
| 63 | * callbacks are called by the PSCI driver (PSCI device is the SMCCC features | |
| 64 | * root device). | |
| 65 | * | |
| 66 | * The FF-A driver supports the SMCCCv1.2 extended input/output registers. | |
| 67 | * So, the legacy SMC invocation is not used. | |
| 68 | * | |
| 69 | * Return: | |
| 70 | * | |
| 71 | * 0 on success. Otherwise, failure | |
| 72 | */ | |
| 73 | static bool arm_ffa_is_supported(void (*invoke_fn)(ulong a0, ulong a1, | |
| 74 | ulong a2, ulong a3, | |
| 75 | ulong a4, ulong a5, | |
| 76 | ulong a6, ulong a7, | |
| 77 | struct arm_smccc_res *res)) | |
| 78 | { | |
| 79 | return arm_ffa_discover(NULL); | |
| 80 | } | |
| 81 | ||
| 82 | /* Arm FF-A driver operations */ | |
| 83 | ||
| 84 | static const struct ffa_bus_ops ffa_ops = { | |
| 85 | .partition_info_get = ffa_get_partitions_info_hdlr, | |
| 86 | .sync_send_receive = ffa_msg_send_direct_req_hdlr, | |
| 87 | .rxtx_unmap = ffa_unmap_rxtx_buffers_hdlr, | |
| 88 | }; | |
| 89 | ||
| 90 | /* Registering the FF-A driver as an SMCCC feature driver */ | |
| 91 | ||
| 92 | ARM_SMCCC_FEATURE_DRIVER(arm_ffa) = { | |
| 93 | .driver_name = FFA_DRV_NAME, | |
| 94 | .is_supported = arm_ffa_is_supported, | |
| 95 | }; | |
| 96 | ||
| 97 | /* Declaring the FF-A driver under UCLASS_FFA */ | |
| 98 | ||
| 99 | U_BOOT_DRIVER(arm_ffa) = { | |
| 100 | .name = FFA_DRV_NAME, | |
| 101 | .id = UCLASS_FFA, | |
| 102 | .flags = DM_REMOVE_OS_PREPARE, | |
| 103 | .ops = &ffa_ops, | |
| 104 | }; |