mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 01:38:22 +00:00
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>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
// SPDX-License-Identifier: BSD-2-Clause
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/*
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* Copyright (c) 2020 Foundries.io Ltd
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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#include <tee.h>
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#include "optee_msg.h"
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#include "optee_private.h"
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static int check_xfer_flags(struct udevice *chip, uint tee_flags)
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{
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uint flags;
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int ret;
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ret = i2c_get_chip_flags(chip, &flags);
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if (ret)
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return ret;
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if (tee_flags & OPTEE_MSG_RPC_CMD_I2C_FLAGS_TEN_BIT) {
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if (!(flags & DM_I2C_CHIP_10BIT))
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return -EINVAL;
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} else {
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if (flags & DM_I2C_CHIP_10BIT)
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return -EINVAL;
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}
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return 0;
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}
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void optee_suppl_cmd_i2c_transfer(struct optee_msg_arg *arg)
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{
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const u8 attr[] = {
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT,
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT,
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OPTEE_MSG_ATTR_TYPE_RMEM_INOUT,
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OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT,
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};
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struct udevice *chip_dev;
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struct tee_shm *shm;
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u8 *buf;
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int ret;
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if (arg->num_params != ARRAY_SIZE(attr) ||
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arg->params[0].attr != attr[0] ||
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arg->params[1].attr != attr[1] ||
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arg->params[2].attr != attr[2] ||
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arg->params[3].attr != attr[3]) {
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goto bad;
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}
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shm = (struct tee_shm *)(unsigned long)arg->params[2].u.rmem.shm_ref;
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buf = shm->addr;
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if (!buf)
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goto bad;
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if (i2c_get_chip_for_busnum((int)arg->params[0].u.value.b,
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(int)arg->params[0].u.value.c,
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0, &chip_dev))
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goto bad;
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if (check_xfer_flags(chip_dev, arg->params[1].u.value.a))
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goto bad;
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switch (arg->params[0].u.value.a) {
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case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_RD:
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ret = dm_i2c_read(chip_dev, 0, buf,
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(size_t)arg->params[2].u.rmem.size);
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break;
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case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_WR:
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ret = dm_i2c_write(chip_dev, 0, buf,
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(size_t)arg->params[2].u.rmem.size);
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break;
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default:
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goto bad;
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}
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if (ret) {
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arg->ret = TEE_ERROR_COMMUNICATION;
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} else {
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arg->params[3].u.value.a = arg->params[2].u.rmem.size;
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arg->ret = TEE_SUCCESS;
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}
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return;
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bad:
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arg->ret = TEE_ERROR_BAD_PARAMETERS;
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}
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