src/soc/intel/common/fsp_reset.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <fsp/api.h>
   5 #include <fsp/util.h>
   6 #include <soc/intel/common/reset.h>
   7 #include <stdint.h>
   8
   9 static const uint8_t fsp_reset_guid[16] = {
  10         0xff, 0x97, 0x05, 0xea, 0x58, 0x88, 0xca, 0x41,
  11         0xbb, 0xc1, 0xfe, 0x18, 0xfc, 0xd2, 0x8e, 0x22
  12 };
  13
  14 static const uint8_t fsp_global_reset_guid[16] = {
  15         0x4c, 0x1b, 0xb3, 0x9d, 0xef, 0xf5, 0xbb, 0x48,
  16         0x94, 0x2b, 0x18, 0x1f, 0x7e, 0x3a, 0x3e, 0x40
  17 };
  18
  19 /* Platform Reset String as per Intel FSP is "PCH RESET" in unicode */
  20 #define PLATFORM_RESET_STRING_LENGTH  20
  21
  22 struct pch_reset_data {
  23         char reserved[PLATFORM_RESET_STRING_LENGTH];
  24         efi_guid_t global_reset_uid;
  25 };
  26
  27 /* This structure is used to provide information about PCH Reset */
  28 struct fsp_reset_hob {
  29         EFI_RESET_TYPE   reset_type;
  30         struct pch_reset_data   reset_data;
  31 };
  32
  33 void chipset_handle_reset(efi_return_status_t status)
  34 {
  35         if (status == CONFIG_FSP_STATUS_GLOBAL_RESET) {
  36                 printk(BIOS_DEBUG, "GLOBAL RESET!\n");
  37                 global_reset();
  38         }
  39
  40         fsp_printk(status, BIOS_ERR, "unhandled reset type");
  41         die("unknown reset type");
  42 }
  43
  44 static efi_return_status_t fsp_reset_type_to_status(EFI_RESET_TYPE reset_type)
  45 {
  46         efi_return_status_t status;
  47
  48         switch (reset_type) {
  49         case EfiResetCold:
  50                 status = FSP_STATUS_RESET_REQUIRED_COLD;
  51                 break;
  52         case EfiResetWarm:
  53                 status = FSP_STATUS_RESET_REQUIRED_WARM;
  54                 break;
  55         default:
  56                 printk(BIOS_ERR, "unhandled reset type %x\n", reset_type);
  57                 die("unknown reset type");
  58         }
  59
  60         return status;
  61 }
  62
  63 /*
  64  * Return PCH Reset Status
  65  * The return status can be between EfiResetCold, EfiResetWarm, EfiResetShutdown
  66  * or EfiResetPlatformSpecific.
  67  *
  68  * If reset type is `EfiResetPlatformSpecific` then relying on pch_reset_data structure
  69  * to know if the reset type is a global reset.
  70  */
  71 efi_return_status_t fsp_get_pch_reset_status(void)
  72 {
  73         size_t size;
  74         const struct fsp_reset_hob *hob = fsp_find_extension_hob_by_guid(fsp_reset_guid, &size);
  75         if (!hob)
  76                 return 0;
  77
  78         if ((hob->reset_type == EfiResetPlatformSpecific) &&
  79                  fsp_guid_compare((void *)&(hob->reset_data.global_reset_uid),
  80                          fsp_global_reset_guid))
  81                 return CONFIG_FSP_STATUS_GLOBAL_RESET;
  82
  83         return fsp_reset_type_to_status(hob->reset_type);
  84 }