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csr.go
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csr.go
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/*
* Copyright 2020, 2021, 2022 Hewlett Packard Enterprise Development LP
* Other additional copyright holders may be indicated within.
*
* The entirety of this work is licensed under the Apache License,
* Version 2.0 (the "License"); you may not use this file except
* in compliance with the License.
*
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package switchtec
import (
"encoding/binary"
"fmt"
)
const (
csrMaxReadWriteLengthInBytes = 4
csrReadSubCommand uint8 = 0
csrWriteSubCommand uint8 = 1
)
func (dev *Device) CsrRead(pdfid uint16, addr uint16, length uint8) ([]byte, error) {
if length > csrMaxReadWriteLengthInBytes {
return nil, fmt.Errorf("csr read of length %d exceeds limit %d", length, csrMaxReadWriteLengthInBytes)
}
cmd := struct {
SubCmd uint8
Reserved0 uint8
Pdfid uint16
Addr uint16
Length uint8
Reserved1 uint8
}{
SubCmd: csrReadSubCommand,
Pdfid: pdfid,
Addr: addr,
Length: length,
}
rsp := struct {
Data [4]byte
}{}
if err := dev.RunCommand(EpResourceAccessCommand, &cmd, &rsp); err != nil {
return nil, err
}
return rsp.Data[0:length], nil
}
func (dev *Device) CsrRead8(pdfid uint16, addr uint16) (uint8, error) {
data, err := dev.CsrRead(pdfid, addr, 1)
if err != nil {
return 0, err
}
return data[0], err
}
func (dev *Device) CsrRead16(pdfid uint16, addr uint16) (uint16, error) {
data, err := dev.CsrRead(pdfid, addr, 2)
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint16(data), nil
}
func (dev *Device) CsrRead32(pdfid uint16, addr uint16) (uint32, error) {
data, err := dev.CsrRead(pdfid, addr, 4)
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(data), nil
}
func (dev *Device) CsrWrite(pdfid uint16, addr uint16, payload []byte) error {
length := len(payload)
if length > csrMaxReadWriteLengthInBytes {
return fmt.Errorf("csr write of length %d exceeds limit %d", length, csrMaxReadWriteLengthInBytes)
}
cmd := struct {
SubCmd uint8
Reserved0 uint8
Pdfid uint16
Addr uint16
Length uint8
Reserved1 uint8
Data [4]byte
}{
SubCmd: csrWriteSubCommand,
Pdfid: pdfid,
Addr: addr,
Length: uint8(length),
}
copy(cmd.Data[:], payload)
return dev.RunCommand(EpResourceAccessCommand, &cmd, nil)
}
func (dev *Device) CsrWrite8(pdfid uint16, addr uint16, data uint8) error {
payload := [1]byte{data}
return dev.CsrWrite(pdfid, addr, payload[:])
}
func (dev *Device) CsrWrite16(pdfid uint16, addr uint16, data uint16) error {
payload := [2]byte{}
binary.LittleEndian.PutUint16(payload[:], data)
return dev.CsrWrite(pdfid, addr, payload[:])
}
func (dev *Device) CsrWrite32(pdfid uint16, addr uint16, data uint32) error {
payload := [4]byte{}
binary.LittleEndian.PutUint32(payload[:], data)
return dev.CsrWrite(pdfid, addr, payload[:])
}