src/mainboard/google/octopus/variants/baseboard/cbi_ssfc.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 #include <baseboard/cbi_ssfc.h>
   4 #include <console/console.h>
   5 #include <ec/google/chromeec/ec.h>
   6
   7 static int get_ssfc(uint32_t *val)
   8 {
   9         static uint32_t known_value;
  10         static enum {
  11                 SSFC_NOT_READ,
  12                 SSFC_AVAILABLE,
  13         } ssfc_state = SSFC_NOT_READ;
  14
  15         if (ssfc_state == SSFC_AVAILABLE) {
  16                 *val = known_value;
  17                 return 0;
  18         }
  19
  20         /*
  21          * If SSFC field is not in the CBI then the value of SSFC will be 0 for
  22          * further processing later since 0 of each bits group means default
  23          * component in a variant. For more detail, please refer to cbi_ssfc.h.
  24          */
  25         if (google_chromeec_cbi_get_ssfc(&known_value) != 0) {
  26                 printk(BIOS_DEBUG, "SSFC not set in CBI\n");
  27                 return -1;
  28         }
  29
  30         ssfc_state = SSFC_AVAILABLE;
  31         *val = known_value;
  32         printk(BIOS_INFO, "SSFC 0x%x.\n", known_value);
  33
  34         return 0;
  35 }
  36
  37 static unsigned int extract_field(uint32_t mask, int shift)
  38 {
  39         uint32_t ssfc;
  40
  41         /* On errors nothing is assumed to be set. */
  42         if (get_ssfc(&ssfc))
  43                 return 0;
  44
  45         return (ssfc >> shift) & mask;
  46 }
  47
  48 static enum ssfc_audio_codec ssfc_get_default_audio_codec(void)
  49 {
  50         /*
  51          * Octopus has two reference boards; yorp is with DA7219 and bip is with
  52          * RT5682. Currently only AMPTON derived from bip so only it uses
  53          * RT5682 as the default source in the first MP devices.
  54          */
  55         if (CONFIG(BOARD_GOOGLE_AMPTON))
  56                 return SSFC_AUDIO_CODEC_RT5682;
  57
  58         return SSFC_AUDIO_CODEC_DA7219;
  59 }
  60
  61 enum ssfc_audio_codec ssfc_get_audio_codec(void)
  62 {
  63         uint32_t codec = extract_field(
  64                         SSFC_AUDIO_CODEC_MASK, SSFC_AUDIO_CODEC_OFFSET);
  65
  66         if (codec != SSFC_AUDIO_CODEC_DEFAULT)
  67                 return codec;
  68
  69         return ssfc_get_default_audio_codec();
  70 }