cbi_ssfc.c

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/* 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();
}