1 files changed, 70 insertions, 0 deletions
diff --git a/src/mainboard/google/octopus/variants/baseboard/cbi_ssfc.c b/src/mainboard/google/octopus/variants/baseboard/cbi_ssfc.c
new file mode 100644
index 0000000000..589f92e139
--- /dev/null
+++ b/src/mainboard/google/octopus/variants/baseboard/cbi_ssfc.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/cbi_ssfc.h>
+#include <console/console.h>
+#include <ec/google/chromeec/ec.h>
+
+static int get_ssfc(uint32_t *val)
+{
+	static uint32_t known_value;
+	static enum {
+		SSFC_NOT_READ,
+		SSFC_AVAILABLE,
+	} ssfc_state = SSFC_NOT_READ;
+
+	if (ssfc_state == SSFC_AVAILABLE) {
+		*val = known_value;
+		return 0;
+	}
+
+	/*
+	 * If SSFC field is not in the CBI then the value of SSFC will be 0 for
+	 * further processing later since 0 of each bits group means default
+	 * component in a variant. For more detail, please refer to cbi_ssfc.h.
+	 */
+	if (google_chromeec_cbi_get_ssfc(&known_value) != 0) {
+		printk(BIOS_DEBUG, "SSFC not set in CBI\n");
+		return -1;
+	}
+
+	ssfc_state = SSFC_AVAILABLE;
+	*val = known_value;
+	printk(BIOS_INFO, "SSFC 0x%x.\n", known_value);
+
+	return 0;
+}
+
+static unsigned int extract_field(uint32_t mask, int shift)
+{
+	uint32_t ssfc;
+
+	/* On errors nothing is assumed to be set. */
+	if (get_ssfc(&ssfc))
+		return 0;
+
+	return (ssfc >> shift) & mask;
+}
+
+static enum ssfc_audio_codec ssfc_get_default_audio_codec(void)
+{
+	/*
+	 * Octopus has two reference boards; yorp is with DA7219 and bip is with
+	 * RT5682. Currently only AMPTON derived from bip so only it uses
+	 * RT5682 as the default source in the first MP devices.
+	 */
+	if (CONFIG(BOARD_GOOGLE_AMPTON))
+		return SSFC_AUDIO_CODEC_RT5682;
+
+	return SSFC_AUDIO_CODEC_DA7219;
+}
+
+enum ssfc_audio_codec ssfc_get_audio_codec(void)
+{
+	uint32_t codec = extract_field(
+			SSFC_AUDIO_CODEC_MASK, SSFC_AUDIO_CODEC_OFFSET);
+
+	if (codec != SSFC_AUDIO_CODEC_DEFAULT)
+		return codec;
+
+	return ssfc_get_default_audio_codec();
+}