soc/amd/mendocino: Consume fsp misc_data hob
Provide support function to query fsp misc_data hob and return smu
reported power and thermal limit.
BUG=b:253301653
TEST=Use get_amd_smu_reported_tdp(&tdp) values match what FSP placed in
the hob.
Change-Id: I9f0d8cdd616726c5a714e99504b83b0126dd273b
Signed-off-by: Jason Glenesk <jason.glenesk@amd.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73747
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/amd/mendocino/fsp_misc_data_hob.c b/src/soc/amd/mendocino/fsp_misc_data_hob.c
new file mode 100644
index 0000000..103f821
--- /dev/null
+++ b/src/soc/amd/mendocino/fsp_misc_data_hob.c
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <FspGuids.h>
+#include <fsp/amd_misc_data.h>
+#include <fsp/amd_misc_data_hob.h>
+#include <fsp/util.h>
+#include <string.h>
+#include <types.h>
+
+static enum cb_err get_amd_misc_data_hob(const struct amd_misc_data **fsp_misc_data, int min_revision)
+{
+ static const struct amd_misc_data *fsp_misc_data_cache;
+ size_t hob_size = 0;
+ const struct amd_misc_data *hob;
+
+ if (fsp_misc_data_cache) {
+ *fsp_misc_data = fsp_misc_data_cache;
+ return CB_SUCCESS;
+ }
+
+ hob = fsp_find_extension_hob_by_guid(AMD_MISC_DATA_HOB_GUID.b, &hob_size);
+
+ if (hob == NULL || hob_size < sizeof(struct amd_misc_data)) {
+ printk(BIOS_ERR, "Couldn't find fsp misc data HOB.\n");
+ return CB_ERR;
+ }
+
+ if (hob->version < min_revision) {
+ printk(BIOS_ERR, "Unexpected fsp misc data HOB version.\n");
+ return CB_ERR;
+ }
+
+ fsp_misc_data_cache = hob;
+ *fsp_misc_data = fsp_misc_data_cache;
+ return CB_SUCCESS;
+}
+
+enum cb_err get_amd_smu_reported_tdp(uint32_t *tdp)
+{
+ const struct amd_misc_data *fsp_misc_data = NULL;
+
+ if (get_amd_misc_data_hob(&fsp_misc_data, AMD_MISC_DATA_VERSION) != CB_SUCCESS)
+ return CB_ERR;
+
+ *tdp = fsp_misc_data->smu_power_and_thm_limit;
+
+ return CB_SUCCESS;
+}