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/Makefile.inc b/src/soc/amd/mendocino/Makefile.inc
index 65a49b0..9700381 100644
--- a/src/soc/amd/mendocino/Makefile.inc
+++ b/src/soc/amd/mendocino/Makefile.inc
@@ -30,6 +30,7 @@
ramstage-y += chip.c
ramstage-y += cpu.c
ramstage-y += fch.c
+ramstage-y += fsp_misc_data_hob.c
ramstage-y += fsp_s_params.c
ramstage-y += gpio.c
ramstage-y += i2c.c
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;
+}
diff --git a/src/soc/amd/mendocino/include/fsp/amd_misc_data.h b/src/soc/amd/mendocino/include/fsp/amd_misc_data.h
new file mode 100644
index 0000000..df42d53
--- /dev/null
+++ b/src/soc/amd/mendocino/include/fsp/amd_misc_data.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef AMD_MISC_DATA_H
+#define AMD_MISC_DATA_H
+
+#include <types.h>
+
+enum cb_err get_amd_smu_reported_tdp(uint32_t *tdp);
+
+#endif /* AMD_MISC_DATA_H */
diff --git a/src/soc/amd/mendocino/include/fsp/amd_misc_data_hob.h b/src/soc/amd/mendocino/include/fsp/amd_misc_data_hob.h
new file mode 100644
index 0000000..66b8bea
--- /dev/null
+++ b/src/soc/amd/mendocino/include/fsp/amd_misc_data_hob.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __AMD_MISC_DATA_HOB_H__
+#define __AMD_MISC_DATA_HOB_H__
+
+#define AMD_MISC_DATA_VERSION 2
+
+struct amd_misc_data {
+ uint8_t version;
+ uint8_t unused[3];
+ uint32_t smu_power_and_thm_limit;
+} __packed;
+
+#endif /* __AMD_MISC_DATA_HOB_H__ */
diff --git a/src/vendorcode/amd/fsp/mendocino/FspGuids.h b/src/vendorcode/amd/fsp/mendocino/FspGuids.h
index 1bef794..cb99d21 100644
--- a/src/vendorcode/amd/fsp/mendocino/FspGuids.h
+++ b/src/vendorcode/amd/fsp/mendocino/FspGuids.h
@@ -21,4 +21,8 @@
GUID_INIT(0x3060C5EC, 0x7399, 0x432D, \
0xBC, 0x97, 0xBF, 0x95, 0xE4, 0x3D, 0x53, 0x0C )
+#define AMD_MISC_DATA_HOB_GUID \
+ GUID_INIT(0x27f7d972, 0x318f, 0x4665, \
+ 0x8a, 0x99, 0xf4, 0x4c, 0x04, 0x4b, 0x49, 0x08)
+
#endif /* __FSP_GUIDS__ */