util: Add hda-decoder

This tool helps take off the burden of manually decoding default
configuration registers. Using decoded values can make code more
self-documenting compared to shrouding it with magic numbers.

This is also written as a module which allows easy integration with
other tools written in Go (e.g. autoport).

Change-Id: Ib4fb652e178517b2b7aceaac8be005c5b2d3b03e
Signed-off-by: Nicholas Sudsgaard <devel+coreboot@nsudsgaard.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80470
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

7 files changed, 477 insertions, 0 deletions

diff --git a/util/hda-decoder/.gitignore b/util/hda-decoder/.gitignore
new file mode 100644
index 0000000000..13900275b2
--- /dev/null
+++ b/util/hda-decoder/.gitignore
@@ -0,0 +1 @@
+hda-decoder
diff --git a/util/hda-decoder/Makefile b/util/hda-decoder/Makefile
new file mode 100644
index 0000000000..c67aaf8ebe
--- /dev/null
+++ b/util/hda-decoder/Makefile
@@ -0,0 +1,10 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+PROJECT_NAME = hda-decoder
+
+default:
+	go version
+	go build -v -o $(PROJECT_NAME)
+
+clean:
+	rm -Rf $(PROJECT_NAME)
diff --git a/util/hda-decoder/decoder/lib.go b/util/hda-decoder/decoder/lib.go
new file mode 100644
index 0000000000..834e83044c
--- /dev/null
+++ b/util/hda-decoder/decoder/lib.go
@@ -0,0 +1,179 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+package decoder
+
+import (
+	"fmt"
+	"math/bits"
+)
+
+type Fields[T uint32 | string] struct {
+	PortConnectivity   T
+	Location           T
+	DefaultDevice      T
+	ConnectionType     T
+	Color              T
+	Misc               T
+	DefaultAssociation T
+	Sequence           T
+}
+
+func getField(config uint32, mask uint32) uint32 {
+	return (config & mask) >> bits.TrailingZeros32(mask)
+}
+
+func Decode(config uint32) Fields[uint32] {
+	return Fields[uint32]{
+		PortConnectivity:   getField(config, 0xc0000000),
+		Location:           getField(config, 0x3f000000),
+		DefaultDevice:      getField(config, 0x00f00000),
+		ConnectionType:     getField(config, 0x000f0000),
+		Color:              getField(config, 0x0000f000),
+		Misc:               getField(config, 0x00000f00),
+		DefaultAssociation: getField(config, 0x000000f0),
+		Sequence:           getField(config, 0x0000000f),
+	}
+}
+
+func PortIsConnected(config uint32) bool {
+	return Decode(config).PortConnectivity != 0x1
+}
+
+var portConnectivityDescriptions = map[uint32]string{
+	0x0: "AZALIA_JACK",
+	0x1: "AZALIA_NC",
+	0x2: "AZALIA_INTEGRATED",
+	0x3: "AZALIA_JACK_AND_INTEGRATED",
+}
+
+var grossLocationDescriptions = map[uint32]string{
+	0x00: "AZALIA_EXTERNAL_PRIMARY_CHASSIS",
+	0x10: "AZALIA_INTERNAL",
+	0x20: "AZALIA_SEPARATE_CHASSIS",
+	0x30: "AZALIA_LOCATION_OTHER",
+}
+
+var geometricLocationDescriptions = map[uint32]string{
+	0x00: "AZALIA_GEOLOCATION_NA",
+	0x01: "AZALIA_REAR",
+	0x02: "AZALIA_FRONT",
+	0x03: "AZALIA_LEFT",
+	0x04: "AZALIA_RIGHT",
+	0x05: "AZALIA_TOP",
+	0x06: "AZALIA_BOTTOM",
+	0x07: "AZALIA_SPECIAL7",
+	0x08: "AZALIA_SPECIAL8",
+	0x09: "AZALIA_SPECIAL9",
+}
+
+var specialLocationDescriptions = map[uint32]string{
+	0x00 | 0x07: "AZALIA_REAR_PANEL",
+	0x00 | 0x08: "AZALIA_DRIVE_BAY",
+	0x10 | 0x07: "AZALIA_RISER",
+	0x10 | 0x08: "AZALIA_DIGITAL_DISPLAY",
+	0x10 | 0x09: "AZALIA_ATAPI",
+	0x30 | 0x07: "AZALIA_MOBILE_LID_INSIDE",
+	0x30 | 0x08: "AZALIA_MOBILE_LID_OUTSIDE",
+}
+
+var defaultDeviceDescriptions = map[uint32]string{
+	0x0: "AZALIA_LINE_OUT",
+	0x1: "AZALIA_SPEAKER",
+	0x2: "AZALIA_HP_OUT",
+	0x3: "AZALIA_CD",
+	0x4: "AZALIA_SPDIF_OUT",
+	0x5: "AZALIA_DIGITAL_OTHER_OUT",
+	0x6: "AZALIA_MODEM_LINE_SIDE",
+	0x7: "AZALIA_MODEM_HANDSET_SIDE",
+	0x8: "AZALIA_LINE_IN",
+	0x9: "AZALIA_AUX",
+	0xa: "AZALIA_MIC_IN",
+	0xb: "AZALIA_TELEPHONY",
+	0xc: "AZALIA_SPDIF_IN",
+	0xd: "AZALIA_DIGITAL_OTHER_IN",
+	0xf: "AZALIA_DEVICE_OTHER",
+}
+
+var connectionTypeDescriptions = map[uint32]string{
+	0x0: "AZALIA_TYPE_UNKNOWN",
+	0x1: "AZALIA_STEREO_MONO_1_8",
+	0x2: "AZALIA_STEREO_MONO_1_4",
+	0x3: "AZALIA_ATAPI_INTERNAL",
+	0x4: "AZALIA_RCA",
+	0x5: "AZALIA_OPTICAL",
+	0x6: "AZALIA_OTHER_DIGITAL",
+	0x7: "AZALIA_OTHER_ANALOG",
+	0x8: "AZALIA_MULTICHANNEL_ANALOG",
+	0x9: "AZALIA_XLR",
+	0xa: "AZALIA_RJ_11",
+	0xb: "AZALIA_COMBINATION",
+	0xf: "AZALIA_TYPE_OTHER",
+}
+
+var colorDescriptions = map[uint32]string{
+	0x0: "AZALIA_COLOR_UNKNOWN",
+	0x1: "AZALIA_BLACK",
+	0x2: "AZALIA_GREY",
+	0x3: "AZALIA_BLUE",
+	0x4: "AZALIA_GREEN",
+	0x5: "AZALIA_RED",
+	0x6: "AZALIA_ORANGE",
+	0x7: "AZALIA_YELLOW",
+	0x8: "AZALIA_PURPLE",
+	0x9: "AZALIA_PINK",
+	0xe: "AZALIA_WHITE",
+	0xf: "AZALIA_COLOR_OTHER",
+}
+
+var miscDescriptions = map[uint32]string{
+	0x0: "AZALIA_JACK_PRESENCE_DETECT",
+	0x1: "AZALIA_NO_JACK_PRESENCE_DETECT",
+}
+
+func getDescription(field uint32, descriptions map[uint32]string) string {
+	desc, exists := descriptions[field]
+
+	if !exists {
+		return fmt.Sprintf("0x%x", field)
+	}
+	return desc
+}
+
+func getLocationDescription(field uint32) string {
+	desc, isSpecialLocation := specialLocationDescriptions[field]
+	if isSpecialLocation {
+		return desc
+	}
+
+	grossLocation := field & 0x30
+	geometricLocation := field & 0x0f
+
+	desc = grossLocationDescriptions[grossLocation]
+	if geometricLocation != 0x00 {
+		desc += " | " + getDescription(geometricLocation, geometricLocationDescriptions)
+	}
+	return desc
+}
+
+func getMiscDescription(field uint32) string {
+	presenceBit := field & 0b0001
+	reservedBits := field & 0b1110
+
+	desc := miscDescriptions[presenceBit]
+	if bits.OnesCount32(reservedBits) > 0 {
+		desc += fmt.Sprintf(" | 0x%x", reservedBits)
+	}
+	return desc
+}
+
+func ToHumanReadable(fields Fields[uint32]) Fields[string] {
+	return Fields[string]{
+		PortConnectivity:   getDescription(fields.PortConnectivity, portConnectivityDescriptions),
+		Location:           getLocationDescription(fields.Location),
+		DefaultDevice:      getDescription(fields.DefaultDevice, defaultDeviceDescriptions),
+		ConnectionType:     getDescription(fields.ConnectionType, connectionTypeDescriptions),
+		Color:              getDescription(fields.Color, colorDescriptions),
+		Misc:               getMiscDescription(fields.Misc),
+		DefaultAssociation: fmt.Sprintf("%d", fields.DefaultAssociation),
+		Sequence:           fmt.Sprintf("%d", fields.Sequence),
+	}
+}
diff --git a/util/hda-decoder/decoder/lib_test.go b/util/hda-decoder/decoder/lib_test.go
new file mode 100644
index 0000000000..045c0fced9
--- /dev/null
+++ b/util/hda-decoder/decoder/lib_test.go
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0-only
+package decoder
+
+import (
+	"reflect"
+	"testing"
+)
+
+type portIsConnectedTest struct {
+	arg1     uint32
+	expected bool
+}
+
+var portIsConnectedTests = []portIsConnectedTest{
+	portIsConnectedTest{0x20000000, true},
+	portIsConnectedTest{0xC0000000, true},
+	portIsConnectedTest{0x40000000, false},
+}
+
+func TestPortIsConnected(t *testing.T) {
+	for _, test := range portIsConnectedTests {
+		output := PortIsConnected(test.arg1)
+		if output != test.expected {
+			t.Errorf("Expected %v, received %v", test.expected, output)
+		}
+	}
+}
+
+type decodeTest struct {
+	arg1     uint32
+	expected Fields[uint32]
+}
+
+var decodeTests = []decodeTest{
+	decodeTest{0xe23d1a0e, Fields[uint32]{0x3, 0x22, 0x3, 0xd, 0x1, 0xa, 0x0, 0xe}},
+	decodeTest{0x66a8a2e4, Fields[uint32]{0x1, 0x26, 0xa, 0x8, 0xa, 0x2, 0xe, 0x4}},
+	decodeTest{0x2e00a164, Fields[uint32]{0x0, 0x2e, 0x0, 0x0, 0xa, 0x1, 0x6, 0x4}},
+	decodeTest{0x3b83dfe9, Fields[uint32]{0x0, 0x3b, 0x8, 0x3, 0xd, 0xf, 0xe, 0x9}},
+	decodeTest{0x51708701, Fields[uint32]{0x1, 0x11, 0x7, 0x0, 0x8, 0x7, 0x0, 0x1}},
+}
+
+func TestDecode(t *testing.T) {
+	for _, test := range decodeTests {
+		output := Decode(test.arg1)
+		if !reflect.DeepEqual(output, test.expected) {
+			t.Errorf("Expected %v, received %v", test.expected, output)
+		}
+	}
+}
+
+type toHumanReadableTest struct {
+	arg1     uint32
+	expected Fields[string]
+}
+
+var toHumanReadableTests = []toHumanReadableTest{
+	toHumanReadableTest{0xe23d1a0e, Fields[string]{
+		"AZALIA_JACK_AND_INTEGRATED",
+		"AZALIA_SEPARATE_CHASSIS | AZALIA_FRONT",
+		"AZALIA_CD",
+		"0xd",
+		"AZALIA_BLACK",
+		"AZALIA_JACK_PRESENCE_DETECT | 0xa",
+		"0",
+		"14",
+	}},
+
+	toHumanReadableTest{0x57708701, Fields[string]{
+		"AZALIA_NC",
+		"AZALIA_RISER",
+		"AZALIA_MODEM_HANDSET_SIDE",
+		"AZALIA_TYPE_UNKNOWN",
+		"AZALIA_PURPLE",
+		"AZALIA_NO_JACK_PRESENCE_DETECT | 0x6",
+		"0",
+		"1",
+	}},
+
+	toHumanReadableTest{0x2e00a164, Fields[string]{
+		"AZALIA_JACK",
+		"AZALIA_SEPARATE_CHASSIS | 0xe",
+		"AZALIA_LINE_OUT",
+		"AZALIA_TYPE_UNKNOWN",
+		"0xa",
+		"AZALIA_NO_JACK_PRESENCE_DETECT",
+		"6",
+		"4",
+	}},
+
+	toHumanReadableTest{0x80949653, Fields[string]{
+		"AZALIA_INTEGRATED",
+		"AZALIA_EXTERNAL_PRIMARY_CHASSIS",
+		"AZALIA_AUX",
+		"AZALIA_RCA",
+		"AZALIA_PINK",
+		"AZALIA_JACK_PRESENCE_DETECT | 0x6",
+		"5",
+		"3",
+	}},
+}
+
+func TestToHumanReadable(t *testing.T) {
+	for _, test := range toHumanReadableTests {
+		output := ToHumanReadable(Decode(test.arg1))
+		if output != test.expected {
+			t.Errorf("Expected %v, received %v", test.expected, output)
+		}
+	}
+}
diff --git a/util/hda-decoder/description.md b/util/hda-decoder/description.md
new file mode 100644
index 0000000000..0c9c97e00a
--- /dev/null
+++ b/util/hda-decoder/description.md
@@ -0,0 +1 @@
+Dumps decoded HDA default configuration registers into a format which can be used in coreboot's verb table `Go`
diff --git a/util/hda-decoder/go.mod b/util/hda-decoder/go.mod
new file mode 100644
index 0000000000..a3c611a72b
--- /dev/null
+++ b/util/hda-decoder/go.mod
@@ -0,0 +1,3 @@
+module review.coreboot.org/coreboot.git/util/hda-decoder
+
+go 1.18
diff --git a/util/hda-decoder/main.go b/util/hda-decoder/main.go
new file mode 100644
index 0000000000..83ddcbb43a
--- /dev/null
+++ b/util/hda-decoder/main.go
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-only
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+	"review.coreboot.org/coreboot.git/util/hda-decoder/decoder"
+	"strconv"
+	"strings"
+)
+
+var indentLevel int = 0
+
+func indentedPrintf(format string, args ...interface{}) (n int, err error) {
+	s := fmt.Sprintf("%s%s", strings.Repeat("\t", indentLevel), format)
+	return fmt.Printf(s, args...)
+}
+
+func stringToUint32(s string) uint32 {
+	s = strings.Replace(s, "0x", "", -1)
+	v, err := strconv.ParseUint(s, 16, 32)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return uint32(v)
+}
+
+func decodeConfig(config uint32) {
+	out := decoder.ToHumanReadable(decoder.Decode(config))
+
+	indentedPrintf("%s,\n", out.PortConnectivity)
+	indentedPrintf("%s,\n", out.Location)
+	indentedPrintf("%s,\n", out.DefaultDevice)
+	indentedPrintf("%s,\n", out.ConnectionType)
+	indentedPrintf("%s,\n", out.Color)
+	indentedPrintf("%s,\n", out.Misc)
+	indentedPrintf("%s, %s\n", out.DefaultAssociation, out.Sequence)
+}
+
+func printDisconnectedPort(config uint32) {
+	// The value 0x411111f0 is not defined in the specification, but is a
+	// common value vendors use to indicate "not connected".
+	const nc uint32 = 0x411111f0
+
+	// Setting some values (e.g. 0x40000000) as `AZALIA_PIN_CFG_NC(0)` is
+	// probably harmless. However, we will stay on the safe side for now.
+	if (config & 0xfffffff0) != nc {
+		// Do not decode these values, as they would likely describe a
+		// bogus device which could be slighly confusing.
+		fmt.Printf("0x%08x), // does not describe a jack or internal device\n", config)
+	} else {
+		fmt.Printf("AZALIA_PIN_CFG_NC(%d)),\n", (config & 0x0000000f))
+	}
+}
+
+func decodeFile(path string, codec uint32) {
+	file, err := os.Open(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	for scanner.Scan() {
+		fields := strings.Fields(scanner.Text())
+		pin := stringToUint32(fields[0])
+		config := stringToUint32(fields[1])
+
+		indentedPrintf("AZALIA_PIN_CFG(%d, 0x%02x, ", codec, pin)
+		if decoder.PortIsConnected(config) {
+			fmt.Printf("AZALIA_PIN_DESC(\n")
+			indentLevel += 1
+			decodeConfig(config)
+			indentLevel -= 1
+			indentedPrintf(")),\n")
+		} else {
+			printDisconnectedPort(config)
+		}
+	}
+}
+
+func getFileContents(path string) string {
+	contents, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	return strings.TrimSpace(string(contents))
+}
+
+func getLineCount(path string) int {
+	return len(strings.Split(getFileContents(path), "\n"))
+}
+
+func decodeDeviceCodec(path string, codec uint32, isLastCodec bool, generate bool) {
+	if generate {
+		vendorId := getFileContents(path + "/vendor_id")
+		vendorName := getFileContents(path + "/vendor_name")
+		chipName := getFileContents(path + "/chip_name")
+		subsystemId := getFileContents(path + "/subsystem_id")
+		lineCount := getLineCount(path + "/init_pin_configs")
+
+		indentedPrintf("%s, // Vendor/Device ID: %s %s\n", vendorId, vendorName, chipName)
+		indentedPrintf("%s, // Subsystem ID\n", subsystemId)
+		indentedPrintf("%d,\n", lineCount+1)
+		indentedPrintf("AZALIA_SUBVENDOR(%d, %s),\n\n", codec, subsystemId)
+	}
+
+	decodeFile(path+"/init_pin_configs", codec)
+	if !isLastCodec {
+		fmt.Printf("\n")
+	}
+}
+
+func decodeDeviceCodecs(generate bool) {
+	matches, err := filepath.Glob("/sys/class/sound/hwC0D*")
+	if err != nil {
+		log.Fatal(err)
+	}
+	re := regexp.MustCompile(`D([0-9]+)$`)
+
+	for i, match := range matches {
+		codec := stringToUint32(re.FindStringSubmatch(match)[1])
+		isLastCodec := (i + 1) == len(matches)
+
+		decodeDeviceCodec(match, codec, isLastCodec, generate)
+	}
+}
+
+func isFlagPassed(name string) bool {
+	found := false
+
+	flag.Visit(func(f *flag.Flag) {
+		if f.Name == name {
+			found = true
+		}
+	})
+	return found
+}
+
+func main() {
+	codec := flag.Uint64("codec", 0, "Set the codec number when decoding a file\n"+
+		"This flag is only meaningful in combination with the 'file' flag")
+	config := flag.Uint64("config", 0, "Decode a single configuration")
+	file := flag.String("file", "", "Decode configurations in a file\n"+
+		"The decoder assumes each line in the file has the format: <pin> <config>")
+	generate := flag.Bool("generate", false, "Automatically generate hda_verb.c for the host device")
+	flag.Parse()
+
+	if isFlagPassed("config") {
+		decodeConfig(uint32(*config))
+	} else if isFlagPassed("file") {
+		decodeFile(*file, uint32(*codec))
+	} else {
+		if *generate {
+			fmt.Printf("/* SPDX-License-Identifier: GPL-2.0-only */\n\n")
+			fmt.Printf("#include <device/azalia_device.h>\n\n")
+			fmt.Printf("const u32 cim_verb_data[] = {\n")
+			indentLevel += 1
+		}
+		decodeDeviceCodecs(*generate)
+		if *generate {
+			indentLevel -= 1
+			fmt.Printf("};\n\n")
+			fmt.Printf("const u32 pc_beep_verbs[] = {};\n")
+			fmt.Printf("AZALIA_ARRAY_SIZES;\n")
+		}
+	}
+}