platform: add a platform hook for loading external resources

Currently, in core/init.c we do a fsp-specific load procedure to grab
the kernel image.

We'd like to do two things: allow other types of resources, and have
paths for non-FSP platforms to perform loads.

This change adds a platform-specific load_resource hook, and moves the
currently loading code to fsp_load_resource. To allow other resource
types, we add an identifier to indicate the type of resouce to load.

Signed-off-by: Jeremy Kerr <jeremy.kerr@au.ibm.com>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 48 insertions, 0 deletions

diff --git a/hw/fsp/fsp.c b/hw/fsp/fsp.c
index 51d06b00..7a07835f 100644
--- a/hw/fsp/fsp.c
+++ b/hw/fsp/fsp.c
@@ -98,6 +98,12 @@ static u64 fsp_hir_timeout;
 #define FSP_CRITICAL_OP_TIMEOUT		128
 #define FSP_DRCR_CLEAR_TIMEOUT		128
 
+/* LID numbers. For now we hijack some of pHyp's own until i figure
+ * out the whole business with the MasterLID
+ */
+#define KERNEL_LID_PHYP			0x80a00701
+#define KERNEL_LID_OPAL			0x80f00101
+
 /*
  * We keep track on last logged values for some things to print only on
  * value changes, but also to releive pressure on the tracer which
@@ -2171,6 +2177,48 @@ int fsp_fetch_data_queue(uint8_t flags, uint16_t id, uint32_t sub_id,
 	return OPAL_SUCCESS;
 }
 
+bool fsp_load_resource(enum resource_id id, void *buf, size_t *size)
+{
+	uint32_t lid_no, lid;
+	size_t tmp_size;
+	int rc;
+
+	switch (id) {
+	case RESOURCE_ID_KERNEL:
+		lid_no = KERNEL_LID_OPAL;
+		break;
+	default:
+		return false;
+	}
+
+retry:
+	tmp_size = *size;
+
+	printf("Trying to load OPAL LID %08x...\n", lid_no);
+	lid = fsp_adjust_lid_side(lid_no);
+	rc = fsp_fetch_data(0, FSP_DATASET_NONSP_LID, lid, 0, buf, &tmp_size);
+
+	/* Fall back to a PHYP LID for kernel loads */
+	if (rc && lid_no == KERNEL_LID_OPAL) {
+		const char *ltype = dt_prop_get_def(dt_root, "lid-type", NULL);
+		if (!ltype || strcmp(ltype, "opal")) {
+			prerror("Failed to load in OPAL mode...\n");
+			return false;
+		}
+		printf("Trying to load as PHYP LID...\n");
+		lid_no = KERNEL_LID_PHYP;
+		goto retry;
+	}
+
+	if (rc) {
+		prerror("Failed to load LID\n");
+		return false;
+	}
+
+	*size = tmp_size;
+	return true;
+}
+
 void fsp_used_by_console(void)
 {
 	fsp_lock.in_con_path = true;