src/mainboard/google/drallion/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 <soc/gpio.h>
   7 #include <variant/gpio.h>
   8 #include <types.h>
   9 #include <vendorcode/google/chromeos/chromeos.h>
  10 #include <security/tpm/tss.h>
  11 #include <device/device.h>
  12 #include <intelblocks/pmclib.h>
  13 #include <soc/pmc.h>
  14 #include <soc/pci_devs.h>
  15
  16 enum rec_mode_state {
  17         REC_MODE_UNINITIALIZED,
  18         REC_MODE_NOT_REQUESTED,
  19         REC_MODE_REQUESTED,
  20 };
  21
  22 void fill_lb_gpios(struct lb_gpios *gpios)
  23 {
  24         struct lb_gpio chromeos_gpios[] = {
  25                 {-1, ACTIVE_HIGH, get_lid_switch(), "lid"},
  26                 {-1, ACTIVE_HIGH, 0, "power"},
  27                 {-1, ACTIVE_HIGH, gfx_get_init_done(), "oprom"},
  28                 {-1, ACTIVE_HIGH, 0, "EC in RW"},
  29         };
  30         lb_add_gpios(gpios, chromeos_gpios, ARRAY_SIZE(chromeos_gpios));
  31 }
  32
  33 int get_write_protect_state(void)
  34 {
  35         return gpio_get(GPP_E15);
  36 }
  37
  38 static bool raw_get_recovery_mode_switch(void)
  39 {
  40         return !gpio_get(GPP_E8);
  41 }
  42
  43
  44 int get_recovery_mode_switch(void)
  45 {
  46         static enum rec_mode_state saved_rec_mode = REC_MODE_UNINITIALIZED;
  47         enum rec_mode_state state = REC_MODE_NOT_REQUESTED;
  48         uint8_t cr50_state = 0;
  49
  50         /* Check cached state, since TPM will only tell us the first time */
  51         if (saved_rec_mode != REC_MODE_UNINITIALIZED)
  52                 return saved_rec_mode == REC_MODE_REQUESTED;
  53
  54         /*
  55          * Read one-time recovery request from cr50 in verstage only since
  56          * the TPM driver won't be set up in time for other stages like romstage
  57          * and the value from the TPM would be wrong anyway since the verstage
  58          * read would have cleared the value on the TPM.
  59          *
  60          * The TPM recovery request is passed between stages through vboot data
  61          * or cbmem depending on stage.
  62          */
  63         if (ENV_SEPARATE_VERSTAGE &&
  64             tlcl_cr50_get_recovery_button(&cr50_state) == TPM_SUCCESS &&
  65             cr50_state)
  66                 state = REC_MODE_REQUESTED;
  67
  68         /* Read state from the GPIO controlled by servo. */
  69         if (raw_get_recovery_mode_switch())
  70                 state = REC_MODE_REQUESTED;
  71
  72         /* Store the state in case this is called again in verstage. */
  73         saved_rec_mode = state;
  74
  75         return state == REC_MODE_REQUESTED;
  76 }
  77
  78 int get_lid_switch(void)
  79 {
  80         return 1;
  81 }
  82
  83 void mainboard_prepare_cr50_reset(void)
  84 {
  85 #if ENV_RAMSTAGE
  86         /* Ensure system powers up after CR50 reset */
  87         pmc_soc_set_afterg3_en(true);
  88 #endif
  89 }
  90
  91 int get_ec_is_trusted(void)
  92 {
  93         /* Do not have a Chrome EC involved in entering recovery mode;
  94            Always return trusted. */
  95         return 1;
  96 }