src/devices/board/drivers/mt8167s_ref/mt8167-soc.cc

// Copyright 2018 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 <lib/mmio/mmio.h>

#include <array>

#include <ddk/debug.h>
#include <ddk/device.h>
#include <ddk/platform-defs.h>
#include <ddk/protocol/platform/bus.h>
#include <ddk/protocol/platform/device.h>
#include <fbl/algorithm.h>
#include <soc/mt8167/mt8167-hw.h>

#include "mt8167.h"

namespace {

constexpr size_t kNumberOfPolarityRegisters = 7;
constexpr uint32_t GetRegister(size_t offset) {
  // 1 to invert from Low to High, 0 is either already High or a reserved interrupt
  constexpr bool L = true;
  constexpr bool H = false;
  constexpr bool R = false;
  // Start from interrupt 32 (first SPI after 32 PPIs). Interrupt 217 should be low-level triggered,
  // despite what the datasheet says.
  constexpr std::array<bool, kNumberOfPolarityRegisters* 32> spi_polarities = {
      L, L, L, L, R, R, R, R, L, L, L, L, R, R, R, R,  // 32 (first interrupt in the line).
      L, L, L, L, R, R, R, R, L, L, L, L, R, R, R, R,  // 48.
      L, L, L, L, R, R, R, R, L, L, L, L, R, R, R, R,  // 64.
      L, R, L, L, L, L, R, R, R, R, R, R, R, R, R, L,  // 80.
      H, H, H, H, H, H, H, H, L, L, R, L, L, L, L, L,  // 96.
      L, L, L, L, L, L, L, L, L, L, L, L, L, L, L, L,  // 112.
      L, L, L, L, L, L, L, L, L, H, H, L, H, L, L, L,  // 128.
      L, L, L, L, H, L, L, L, L, L, L, L, L, L, L, L,  // 144.
      L, L, L, L, L, H, H, L, L, L, L, L, L, L, L, L,  // 160.
      L, L, L, L, R, L, L, L, L, L, L, L, L, L, L, L,  // 176.
      L, R, L, L, L, L, L, L, L, L, R, L, L, L, L, L,  // 192.
      L, L, L, L, L, L, L, L, L, L, L, L, L, L, L, R,  // 208.
      R, R, L, L, L, L, L, L, L, L, L, R, L, H, H, H,  // 224.
      H, L, L, L, R, R, L, H, H, H, H                  // 240 (first is 240, last is 250).
  };

  uint32_t temporary_register = 0;
  for (size_t j = 0; j < 32; ++j) {
    temporary_register |= static_cast<uint32_t>(spi_polarities[offset + j]) << j;
  }
  return temporary_register;
}

}  // namespace

namespace board_mt8167 {

zx_status_t Mt8167::SocInit() {
  zx_status_t status;
  mmio_buffer_t mmio;
  status =
      mmio_buffer_init_physical(&mmio, MT8167_SOC_BASE, MT8167_SOC_SIZE,
                                // Please do not use get_root_resource() in new code. See ZX-1467.
                                get_root_resource(), ZX_CACHE_POLICY_UNCACHED_DEVICE);
  if (status != ZX_OK) {
    zxlogf(ERROR, "%s: mmio_buffer_init_physical failed %d ", __FUNCTION__, status);
    return status;
  }
  ddk::MmioBuffer mmio2(mmio);
  UpdateRegisters(std::move(mmio2));

  return ZX_OK;
}

void Mt8167::UpdateRegisters(ddk::MmioBuffer mmio) {
  // Convert Level interrupt polarity in SOC from Low to High as needed by gicv2.
  for (size_t i = 0; i < kNumberOfPolarityRegisters; ++i) {
    // 32 interrupts per register, one register every 4 bytes.
    mmio.Write32(GetRegister(i * 32), MT8167_SOC_INT_POL + i * 4);
  }
}

}  // namespace board_mt8167