99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
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// Copyright 2016 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package allwinner
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import (
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"strings"
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"sync"
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"periph.io/x/periph/host/distro"
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)
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// Present detects whether the host CPU is an Allwinner CPU.
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//
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// https://en.wikipedia.org/wiki/Allwinner_Technology
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func Present() bool {
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detection.do()
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return detection.isAllwinner
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}
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// IsR8 detects whether the host CPU is an Allwinner R8 CPU.
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//
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// It looks for the string "sun5i-r8" in /proc/device-tree/compatible.
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func IsR8() bool {
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detection.do()
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return detection.isR8
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}
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// IsA20 detects whether the host CPU is an Allwinner A20 CPU.
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//
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// It first looks for the string "sun71-a20" in /proc/device-tree/compatible,
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// and if that fails it checks for "Hardware : sun7i" in /proc/cpuinfo.
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func IsA20() bool {
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detection.do()
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return detection.isA20
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}
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// IsA64 detects whether the host CPU is an Allwinner A64 CPU.
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//
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// It looks for the string "sun50iw1p1" in /proc/device-tree/compatible.
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func IsA64() bool {
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detection.do()
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return detection.isA64
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}
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//
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type detectionS struct {
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mu sync.Mutex
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done bool
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isAllwinner bool
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isR8 bool
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isA20 bool
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isA64 bool
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}
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var detection detectionS
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// do contains the CPU detection logic that determines whether we have an
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// Allwinner CPU and if so, which exact model.
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//
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// Sadly there is no science behind this, it's more of a trial and error using
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// as many boards and OS flavors as possible.
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func (d *detectionS) do() {
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d.mu.Lock()
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defer d.mu.Unlock()
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if !d.done {
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d.done = true
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if isArm {
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for _, c := range distro.DTCompatible() {
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if strings.Contains(c, "sun50iw1p1") {
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d.isA64 = true
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}
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if strings.Contains(c, "sun5i-r8") {
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d.isR8 = true
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}
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if strings.Contains(c, "sun7i-a20") {
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d.isA20 = true
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}
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}
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d.isAllwinner = d.isA64 || d.isR8 || d.isA20
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if !d.isAllwinner {
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// The kernel in the image that comes pre-installed on the pcDuino3 Nano
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// is an old 3.x kernel that doesn't expose the device-tree in procfs,
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// so do an extra check in cpuinfo as well if we haven't detected
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// anything yet.
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// Distros based on 4.x kernels do expose it.
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if hw, ok := distro.CPUInfo()["Hardware"]; ok {
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if hw == "sun7i" {
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d.isA20 = true
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}
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}
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}
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}
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}
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}
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