src/devices/board/drivers/astro/astro-sysmem.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 <fuchsia/hardware/platform/bus/c/banjo.h>
#include <zircon/device/sysmem.h>

#include <ddk/debug.h>
#include <ddk/device.h>
#include <ddk/platform-defs.h>

#include "astro.h"

namespace astro {

static const pbus_bti_t sysmem_btis[] = {
    {
        .iommu_index = 0,
        .bti_id = BTI_SYSMEM,
    },
};

static const sysmem_metadata_t sysmem_metadata = {
    .vid = PDEV_VID_AMLOGIC,
    .pid = PDEV_PID_AMLOGIC_S905D2,
    // On astro there are two protected memory ranges.  The protected_memory_size field configures
    // the size of the non-VDEC range.  In contrast, the VDEC range is configured and allocated via
    // the TEE, and is currently 7.5 MiB.  The VDEC range is a fixed location within the overall
    // optee reserved range passed to Zircon during boot - the specific location is obtained by
    // sysmem calling the secmem TA via fuchsia::sysmem::Tee protocol between sysmem and TEE
    // Controller.
    //
    // The values below aren't use and are overridden by the kernel command-line set in the board
    // file.
    .protected_memory_size = 0,
    .contiguous_memory_size = 0,
};

static const pbus_metadata_t sysmem_metadata_list[] = {{
    .type = SYSMEM_METADATA,
    .data_buffer = &sysmem_metadata,
    .data_size = sizeof(sysmem_metadata),
}};

static const pbus_dev_t sysmem_dev = []() {
  pbus_dev_t ret = {};
  ret.name = "sysmem";
  ret.vid = PDEV_VID_GENERIC;
  ret.pid = PDEV_PID_GENERIC;
  ret.did = PDEV_DID_SYSMEM;
  ret.bti_list = sysmem_btis;
  ret.bti_count = countof(sysmem_btis);
  ret.metadata_list = sysmem_metadata_list;
  ret.metadata_count = countof(sysmem_metadata_list);
  return ret;
}();

zx_status_t Astro::SysmemInit() {
  zx_status_t status = pbus_.DeviceAdd(&sysmem_dev);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: ProtocolDeviceAdd failed %d", __func__, status);
    return status;
  }

  return ZX_OK;
}

}  // namespace astro