mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-22 03:03:05 +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
|
|
/*
|
|
* Copyright (c) 2020 Foundries.io Ltd
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <i2c.h>
|
|
#include <tee.h>
|
|
#include "optee_msg.h"
|
|
#include "optee_private.h"
|
|
|
|
static int check_xfer_flags(struct udevice *chip, uint tee_flags)
|
|
{
|
|
uint flags;
|
|
int ret;
|
|
|
|
ret = i2c_get_chip_flags(chip, &flags);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (tee_flags & OPTEE_MSG_RPC_CMD_I2C_FLAGS_TEN_BIT) {
|
|
if (!(flags & DM_I2C_CHIP_10BIT))
|
|
return -EINVAL;
|
|
} else {
|
|
if (flags & DM_I2C_CHIP_10BIT)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void optee_suppl_cmd_i2c_transfer(struct optee_msg_arg *arg)
|
|
{
|
|
const u8 attr[] = {
|
|
OPTEE_MSG_ATTR_TYPE_VALUE_INPUT,
|
|
OPTEE_MSG_ATTR_TYPE_VALUE_INPUT,
|
|
OPTEE_MSG_ATTR_TYPE_RMEM_INOUT,
|
|
OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT,
|
|
};
|
|
struct udevice *chip_dev;
|
|
struct tee_shm *shm;
|
|
u8 *buf;
|
|
int ret;
|
|
|
|
if (arg->num_params != ARRAY_SIZE(attr) ||
|
|
arg->params[0].attr != attr[0] ||
|
|
arg->params[1].attr != attr[1] ||
|
|
arg->params[2].attr != attr[2] ||
|
|
arg->params[3].attr != attr[3]) {
|
|
goto bad;
|
|
}
|
|
|
|
shm = (struct tee_shm *)(unsigned long)arg->params[2].u.rmem.shm_ref;
|
|
buf = shm->addr;
|
|
if (!buf)
|
|
goto bad;
|
|
|
|
if (i2c_get_chip_for_busnum((int)arg->params[0].u.value.b,
|
|
(int)arg->params[0].u.value.c,
|
|
0, &chip_dev))
|
|
goto bad;
|
|
|
|
if (check_xfer_flags(chip_dev, arg->params[1].u.value.a))
|
|
goto bad;
|
|
|
|
switch (arg->params[0].u.value.a) {
|
|
case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_RD:
|
|
ret = dm_i2c_read(chip_dev, 0, buf,
|
|
(size_t)arg->params[2].u.rmem.size);
|
|
break;
|
|
case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_WR:
|
|
ret = dm_i2c_write(chip_dev, 0, buf,
|
|
(size_t)arg->params[2].u.rmem.size);
|
|
break;
|
|
default:
|
|
goto bad;
|
|
}
|
|
|
|
if (ret) {
|
|
arg->ret = TEE_ERROR_COMMUNICATION;
|
|
} else {
|
|
arg->params[3].u.value.a = arg->params[2].u.rmem.size;
|
|
arg->ret = TEE_SUCCESS;
|
|
}
|
|
|
|
return;
|
|
bad:
|
|
arg->ret = TEE_ERROR_BAD_PARAMETERS;
|
|
}
|