| // Copyright 2017 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. |
| |
| #pragma once |
| |
| #include <hwreg/internal.h> |
| |
| #include <stdint.h> |
| |
| namespace hwreg { |
| |
| // Wrap MMIO for easier testing of device drivers |
| |
| class RegisterIo { |
| public: |
| RegisterIo(volatile void* mmio) : mmio_(reinterpret_cast<uintptr_t>(mmio)) { |
| } |
| |
| // Write |val| to the |sizeof(IntType)| byte field located |offset| bytes from |
| // |base()|. |
| template <class IntType> void Write(IntType val, uint32_t offset) { |
| static_assert(internal::IsSupportedInt<IntType>::value, |
| "unsupported register access width"); |
| auto ptr = reinterpret_cast<volatile IntType*>(mmio_ + offset); |
| *ptr = val; |
| } |
| |
| // Read the value of the |sizeof(IntType)| byte field located |offset| bytes from |
| // |base()|. |
| template <class IntType> IntType Read(uint32_t offset) { |
| static_assert(internal::IsSupportedInt<IntType>::value, |
| "unsupported register access width"); |
| auto ptr = reinterpret_cast<volatile IntType*>(mmio_ + offset); |
| return *ptr; |
| } |
| |
| uintptr_t base() const { return mmio_; } |
| |
| private: |
| const uintptr_t mmio_; |
| }; |
| |
| } // namespace hwreg |