src/mainboard/google/sarien/chromeos.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <bootmode.h>
   4 #include <boot/coreboot_tables.h>
   5 #include <gpio.h>
   6 #include <variant/gpio.h>
   7 #include <types.h>
   8 #include <vendorcode/google/chromeos/chromeos.h>
   9 #include <security/tpm/tss.h>
  10 #include <device/device.h>
  11 #include <intelblocks/pmclib.h>
  12
  13 enum rec_mode_state {
  14         REC_MODE_UNINITIALIZED,
  15         REC_MODE_NOT_REQUESTED,
  16         REC_MODE_REQUESTED,
  17 };
  18
  19 void fill_lb_gpios(struct lb_gpios *gpios)
  20 {
  21         struct lb_gpio chromeos_gpios[] = {
  22                 {-1, ACTIVE_HIGH, get_lid_switch(), "lid"},
  23                 {-1, ACTIVE_HIGH, 0, "power"},
  24                 {-1, ACTIVE_HIGH, gfx_get_init_done(), "oprom"},
  25                 {-1, ACTIVE_HIGH, 0, "EC in RW"},
  26         };
  27         lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
  28 }
  29
  30 int get_write_protect_state(void)
  31 {
  32         return gpio_get(GPP_E15);
  33 }
  34
  35 static bool raw_get_recovery_mode_switch(void)
  36 {
  37         return !gpio_get(GPP_E8);
  38 }
  39
  40
  41 int get_recovery_mode_switch(void)
  42 {
  43         static enum rec_mode_state saved_rec_mode = REC_MODE_UNINITIALIZED;
  44         enum rec_mode_state state = REC_MODE_NOT_REQUESTED;
  45         uint8_t cr50_state = 0;
  46
  47         /* Check cached state, since TPM will only tell us the first time */
  48         if (saved_rec_mode != REC_MODE_UNINITIALIZED)
  49                 return saved_rec_mode == REC_MODE_REQUESTED;
  50
  51         /*
  52          * Read one-time recovery request from cr50 in verstage only since
  53          * the TPM driver won't be set up in time for other stages like romstage
  54          * and the value from the TPM would be wrong anyway since the verstage
  55          * read would have cleared the value on the TPM.
  56          *
  57          * The TPM recovery request is passed between stages through vboot data
  58          * or cbmem depending on stage.
  59          */
  60         if (ENV_SEPARATE_VERSTAGE &&
  61             tlcl_cr50_get_recovery_button(&cr50_state) == TPM_SUCCESS &&
  62             cr50_state)
  63                 state = REC_MODE_REQUESTED;
  64
  65         /* Read state from the GPIO controlled by servo. */
  66         if (raw_get_recovery_mode_switch())
  67                 state = REC_MODE_REQUESTED;
  68
  69         /* Store the state in case this is called again in verstage. */
  70         saved_rec_mode = state;
  71
  72         return state == REC_MODE_REQUESTED;
  73 }
  74
  75 int get_lid_switch(void)
  76 {
  77         return 1;
  78 }
  79
  80 void mainboard_prepare_cr50_reset(void)
  81 {
  82         /* Ensure system powers up after CR50 reset */
  83         if (ENV_RAMSTAGE)
  84                 pmc_soc_set_afterg3_en(true);
  85 }
  86
  87 int get_ec_is_trusted(void)
  88 {
  89         /* Do not have a Chrome EC involved in entering recovery mode;
  90            Always return trusted. */
  91         return 1;
  92 }