mirror of
https://github.com/AsahiLinux/u-boot
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4e96356185
This commit gives the secure world access to the I2C bus so it can
communicate with I2C slaves (typically those would be secure elements
like the NXP SE050).
A similar service implementation has been merged in linux:
c05210ab ("drivers: optee: allow op-tee to access devices on the i2c
bus")
Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* Copyright (c) 2018, Linaro Limited
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*/
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#include <common.h>
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#include <log.h>
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#include <malloc.h>
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#include <tee.h>
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#include <linux/types.h>
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#include "optee_msg.h"
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#include "optee_msg_supplicant.h"
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#include "optee_private.h"
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#include "optee_smc.h"
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static void cmd_shm_alloc(struct udevice *dev, struct optee_msg_arg *arg,
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void **page_list)
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{
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int rc;
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struct tee_shm *shm;
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void *pl;
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u64 ph_ptr;
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arg->ret_origin = TEE_ORIGIN_COMMS;
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if (arg->num_params != 1 ||
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arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
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arg->ret = TEE_ERROR_BAD_PARAMETERS;
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return;
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}
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rc = __tee_shm_add(dev, 0, NULL, arg->params[0].u.value.b,
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TEE_SHM_REGISTER | TEE_SHM_ALLOC, &shm);
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if (rc) {
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if (rc == -ENOMEM)
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arg->ret = TEE_ERROR_OUT_OF_MEMORY;
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else
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arg->ret = TEE_ERROR_GENERIC;
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return;
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}
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pl = optee_alloc_and_init_page_list(shm->addr, shm->size, &ph_ptr);
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if (!pl) {
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arg->ret = TEE_ERROR_OUT_OF_MEMORY;
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tee_shm_free(shm);
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return;
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}
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*page_list = pl;
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arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
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OPTEE_MSG_ATTR_NONCONTIG;
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arg->params[0].u.tmem.buf_ptr = ph_ptr;
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arg->params[0].u.tmem.size = shm->size;
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arg->params[0].u.tmem.shm_ref = (ulong)shm;
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arg->ret = TEE_SUCCESS;
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}
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static void cmd_shm_free(struct optee_msg_arg *arg)
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{
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arg->ret_origin = TEE_ORIGIN_COMMS;
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if (arg->num_params != 1 ||
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arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
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arg->ret = TEE_ERROR_BAD_PARAMETERS;
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return;
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}
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tee_shm_free((struct tee_shm *)(ulong)arg->params[0].u.value.b);
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arg->ret = TEE_SUCCESS;
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}
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void optee_suppl_cmd(struct udevice *dev, struct tee_shm *shm_arg,
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void **page_list)
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{
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struct optee_msg_arg *arg = shm_arg->addr;
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switch (arg->cmd) {
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case OPTEE_MSG_RPC_CMD_SHM_ALLOC:
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cmd_shm_alloc(dev, arg, page_list);
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break;
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case OPTEE_MSG_RPC_CMD_SHM_FREE:
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cmd_shm_free(arg);
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break;
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case OPTEE_MSG_RPC_CMD_FS:
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debug("REE FS storage isn't available\n");
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arg->ret = TEE_ERROR_STORAGE_NOT_AVAILABLE;
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break;
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case OPTEE_MSG_RPC_CMD_RPMB:
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optee_suppl_cmd_rpmb(dev, arg);
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break;
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case OPTEE_MSG_RPC_CMD_I2C_TRANSFER:
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optee_suppl_cmd_i2c_transfer(arg);
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break;
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default:
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arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
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}
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arg->ret_origin = TEE_ORIGIN_COMMS;
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}
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