zircon/system/dev/board/sherlock/sherlock-tee.cc

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <ddk/debug.h>
#include <ddk/device.h>
#include <ddk/platform-defs.h>
#include <ddk/protocol/platform/bus.h>
#include <fbl/algorithm.h>
#include <zircon/syscalls/smc.h>

#include "sherlock.h"

namespace sherlock {
// The Sherlock Secure OS memory region is defined within the bootloader image. The ZBI provided to
// the kernel must mark this memory space as reserved. The OP-TEE driver will query OP-TEE for the
// exact sub-range of this memory space to be used by the driver.
#define SHERLOCK_SECURE_OS_BASE 0x05300000
#define SHERLOCK_SECURE_OS_LENGTH 0x02000000

static const pbus_mmio_t sherlock_tee_mmios[] = {
    {
        .base = SHERLOCK_SECURE_OS_BASE,
        .length = SHERLOCK_SECURE_OS_LENGTH,
    },
};

static const pbus_bti_t sherlock_tee_btis[] = {
    {
        .iommu_index = 0,
        .bti_id = BTI_TEE,
    },
};

static const pbus_smc_t sherlock_tee_smcs[] = {
    {
        .service_call_num_base = ARM_SMC_SERVICE_CALL_NUM_TRUSTED_OS_BASE,
        .count = ARM_SMC_SERVICE_CALL_NUM_TRUSTED_OS_LENGTH,
        .exclusive = false,
    },
};

static pbus_dev_t tee_dev = []() {
    pbus_dev_t tee_dev;
    tee_dev.name = "tee";
    tee_dev.vid = PDEV_VID_GENERIC;
    tee_dev.pid = PDEV_PID_GENERIC;
    tee_dev.did = PDEV_DID_OPTEE;
    tee_dev.mmio_list = sherlock_tee_mmios;
    tee_dev.mmio_count = fbl::count_of(sherlock_tee_mmios);
    tee_dev.bti_list = sherlock_tee_btis;
    tee_dev.bti_count = fbl::count_of(sherlock_tee_btis);
    tee_dev.smc_list = sherlock_tee_smcs;
    tee_dev.smc_count = fbl::count_of(sherlock_tee_smcs);
    return tee_dev;
}();

zx_status_t Sherlock::TeeInit() {
    zx_status_t status = pbus_.DeviceAdd(&tee_dev);

    if (status != ZX_OK) {
        zxlogf(ERROR, "%s: pbus_device_add tee failed: %d\n", __FUNCTION__, status);
        return status;
    }
    return ZX_OK;
}
} // namespace sherlock