| // Copyright 2021 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /* |
| * Device access interface common functions. |
| */ |
| |
| #include "hps/dev.h" |
| |
| #include "base/logging.h" |
| #include "hps/hps_reg.h" |
| #include "hps/utils.h" |
| |
| namespace hps { |
| |
| bool DevInterface::Read(uint8_t cmd, uint8_t* data, size_t len) { |
| if (this->ReadDevice(cmd, data, len)) { |
| VLOG(2) << "Read: " << cmd << " " << len << " OK"; |
| return true; |
| } |
| VLOG(2) << "Read: " << cmd << " " << len << " FAILED"; |
| return false; |
| } |
| |
| bool DevInterface::Write(uint8_t cmd, const uint8_t* data, size_t len) { |
| if (this->WriteDevice(cmd, data, len)) { |
| VLOG(2) << "Write: " << cmd << " " << len << " OK"; |
| return true; |
| } |
| VLOG(2) << "Write: " << cmd << " " << len << " FAILED"; |
| return false; |
| } |
| |
| /* |
| * Read 1 register. |
| * Returns value read, or -1 for error. |
| */ |
| int DevInterface::ReadReg(HpsReg r) { |
| uint8_t res[2]; |
| |
| // TODO(evanbenn) MCP hal requires a retry on kBankReady |
| // b/191716856 |
| for (int i = 0; i < 2; i++) { |
| if (this->ReadDevice(I2cReg(r), res, sizeof(res))) { |
| int ret = (static_cast<int>(res[0]) << 8) | static_cast<int>(res[1]); |
| VLOG(2) << "ReadReg: " << HpsRegToString(r) << " " << ret << " OK"; |
| return ret; |
| } |
| } |
| VLOG(2) << "ReadReg: " << HpsRegToString(r) << " FAILED"; |
| return -1; |
| } |
| |
| /* |
| * Write 1 register. |
| * Returns false on failure. |
| */ |
| bool DevInterface::WriteReg(HpsReg r, uint16_t data) { |
| uint8_t buf[2]; |
| |
| buf[0] = data >> 8; |
| buf[1] = data & 0xFF; |
| |
| if (this->WriteDevice(I2cReg(r), buf, sizeof(buf))) { |
| VLOG(2) << "WriteReg: " << HpsRegToString(r) << " " << data << " OK"; |
| return true; |
| } else { |
| VLOG(2) << "WriteReg: " << HpsRegToString(r) << " " << data << " FAILED"; |
| return false; |
| } |
| } |
| |
| /* |
| * Return the maximum download block size (in bytes). |
| * Default is 256 bytes. |
| */ |
| size_t DevInterface::BlockSizeBytes() { |
| return 256; |
| } |
| |
| } // namespace hps |