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