// 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.

#ifndef SRC_DEVICES_FW_DRIVERS_QCOM_PIL_QCOM_PIL_H_
#define SRC_DEVICES_FW_DRIVERS_QCOM_PIL_QCOM_PIL_H_

#include <lib/device-protocol/pdev.h>
#include <lib/device-protocol/platform-device.h>
#include <threads.h>
#include <zircon/syscalls/smc.h>
#include <zircon/types.h>

#include <ddk/platform-defs.h>
#include <ddk/protocol/platform/device.h>
#include <ddktl/device.h>
#include <ddktl/metadata/fw.h>
#include <ddktl/protocol/clock.h>
#include <ddktl/protocol/platform/device.h>
#include <fbl/array.h>

namespace qcom_pil {

enum class TzService : uint8_t {
  Boot = 1,
  Pil,
  Info = 6,
};

enum class PasId : uint64_t {
  Modem,
  Q6,  // adsp.
  Dsps,
  Tzapps,
  ModemSw,
  ModemFw,
  Wcnss,
  Secapp,
  Gss,
  Vidc,  // venus.
  Vpu,
  Bcss,
  Unknown,
  Gpu,  // a506_zap.
};

enum class ArgType : uint64_t {
  Val,
  Ro,
  Rw,
  Bufval,
};

enum class PilCmd : uint8_t {
  InitImage = 1,
  MemSetup,
  AuthAndReset = 5,
  Shutdown,
  QuerySupport,
};

enum class InfoCmd : uint8_t {
  CallAvailable = 1,
};

// Not class for integer usage below.
enum CallType : uint8_t {
  kYieldingCall = 0,
  kFastCall = 1,
};

enum CallConvention : uint8_t {
  kSmc32CallConv = 0,
  kSmc64CallConv = 1,
};

enum Service : uint8_t {
  kArchService = 0x00,
  kCpuService = 0x01,
  kSipService = 0x02,
  kOemService = 0x03,
  kStandardService = 0x04,
  kTrustedOsService = 0x32,
  kTrustedOsServiceEnd = 0x3F,
};

enum SmcArgType : uint32_t {
  kValue,  // e.g. an id.
  kBufferReadOnly,
  kBufferReadWrite,  // e.g. the physical address of a buffer.
  kBufferValue,
};

constexpr uint8_t kCallTypeMask = 0x01;
constexpr uint8_t kCallTypeShift = 31;
constexpr uint8_t kCallConvMask = 0x01;
constexpr uint8_t kCallConvShift = 30;
constexpr uint8_t kServiceMask = 0x3F;
constexpr uint8_t kServiceShift = 24;
constexpr uint8_t kTzServiceMask = 0xFF;
constexpr uint8_t kTzServiceShift = 8;
constexpr uint8_t kCallMask = 0xFF;
constexpr uint8_t kCallShift = 0;

static constexpr uint32_t CreateFunctionId(CallType call_type, CallConvention call_conv,
                                           Service service, uint8_t tz_service, uint8_t call) {
  return (((call_type & kCallTypeMask) << kCallTypeShift) |
          ((call_conv & kCallConvMask) << kCallConvShift) |
          ((service & kServiceMask) << kServiceShift) |
          ((tz_service & kTzServiceMask) << kTzServiceShift) | ((call & kCallMask) << kCallShift));
}

static constexpr uint32_t CreatePilFunctionId(PilCmd cmd) {
  return CreateFunctionId(kYieldingCall, kSmc32CallConv, kSipService,
                          static_cast<uint8_t>(TzService::Pil), static_cast<uint8_t>(cmd));
}

static constexpr uint64_t CreateSmcArgs(
    uint32_t n_args, SmcArgType arg0 = SmcArgType::kValue, SmcArgType arg1 = SmcArgType::kValue,
    SmcArgType arg2 = SmcArgType::kValue, SmcArgType arg3 = SmcArgType::kValue,
    SmcArgType arg4 = SmcArgType::kValue, SmcArgType arg5 = SmcArgType::kValue,
    SmcArgType arg6 = SmcArgType::kValue, SmcArgType arg7 = SmcArgType::kValue,
    SmcArgType arg8 = SmcArgType::kValue, SmcArgType arg9 = SmcArgType::kValue) {
  return n_args | (arg0 << 4) | (arg1 << 6) | (arg2 << 8) | (arg3 << 10) | (arg4 << 12) |
         (arg5 << 14) | (arg6 << 16) | (arg7 << 18) | (arg8 << 20) | (arg9 << 22);
}

static constexpr zx_smc_parameters_t CreatePilSmcParams(PilCmd cmd, uint64_t args, uint64_t pas_id,
                                                        uint64_t arg3 = 0, uint64_t arg4 = 0,
                                                        uint64_t arg5 = 0, uint64_t arg6 = 0,
                                                        uint16_t client_id = 0,
                                                        uint16_t secure_os_id = 0) {
  return {CreatePilFunctionId(cmd),
          {},
          args,
          pas_id,
          arg3,
          arg4,
          arg5,
          arg6,
          client_id,
          secure_os_id,
          {}};
}

class PilDevice;
using DeviceType = ddk::Device<PilDevice, ddk::Unbindable>;

class PilDevice : public DeviceType {
 public:
  static zx_status_t Create(void* ctx, zx_device_t* parent);

  explicit PilDevice(zx_device_t* parent) : DeviceType(parent) {}

  zx_status_t Bind();
  zx_status_t Init();

  // Methods required by the ddk mixins
  void DdkUnbind(ddk::UnbindTxn txn);
  void DdkRelease();

 private:
  enum {
    kCryptoAhbClk,
    kCryptoAxiClk,
    kCryptoClk,
    kClockCount,
  };

  void ShutDown();
  int PilThread();
  zx_status_t LoadAuthFirmware(size_t fw_n);

  ddk::PDev pdev_;
  zx::resource smc_;
  zx::bti bti_;
  ddk::ClockProtocolClient clks_[kClockCount];
  thrd_t pil_thread_;
  fbl::Array<metadata::Firmware> fw_;
  fbl::Array<std::optional<ddk::MmioBuffer>> mmios_;
};
}  // namespace qcom_pil

#endif  // SRC_DEVICES_FW_DRIVERS_QCOM_PIL_QCOM_PIL_H_