src/soc/amd/mendocino/fsp_misc_data_hob.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <FspGuids.h>
   5 #include <fsp/amd_misc_data.h>
   6 #include <fsp/amd_misc_data_hob.h>
   7 #include <fsp/util.h>
   8 #include <types.h>
   9
  10 static enum cb_err get_amd_misc_data_hob(const struct amd_misc_data **fsp_misc_data, int min_revision)
  11 {
  12         static const struct amd_misc_data *fsp_misc_data_cache;
  13         size_t hob_size = 0;
  14         const struct amd_misc_data *hob;
  15
  16         if (fsp_misc_data_cache) {
  17                 *fsp_misc_data = fsp_misc_data_cache;
  18                 return CB_SUCCESS;
  19         }
  20
  21         hob = fsp_find_extension_hob_by_guid(AMD_MISC_DATA_HOB_GUID.b, &hob_size);
  22
  23         if (hob == NULL || hob_size < sizeof(struct amd_misc_data)) {
  24                 printk(BIOS_ERR, "Couldn't find fsp misc data HOB.\n");
  25                 return CB_ERR;
  26         }
  27
  28         if (hob->version < min_revision) {
  29                 printk(BIOS_ERR, "Unexpected fsp misc data HOB version.\n");
  30                 return CB_ERR;
  31         }
  32
  33         fsp_misc_data_cache = hob;
  34         *fsp_misc_data = fsp_misc_data_cache;
  35         return CB_SUCCESS;
  36 }
  37
  38 enum cb_err get_amd_smu_reported_tdp(uint32_t *tdp)
  39 {
  40         const struct amd_misc_data *fsp_misc_data = NULL;
  41
  42         if (get_amd_misc_data_hob(&fsp_misc_data, AMD_MISC_DATA_VERSION) != CB_SUCCESS)
  43                 return CB_ERR;
  44
  45         /*
  46          * The FSP will return the TDP in the format 0xX0000, where 'X' is the value
  47          * we're interested in. For example: 0xF0000 (15W), 0x60000 (6W). Re-interpret
  48          * the value so the caller just sees the TDP.
  49          */
  50         printk(BIOS_DEBUG, "fsp_misc_data->smu_power_and_thm_limit = 0x%08X\n",
  51                 fsp_misc_data->smu_power_and_thm_limit);
  52         *tdp = fsp_misc_data->smu_power_and_thm_limit >> 16;
  53
  54         return CB_SUCCESS;
  55 }