plat: zynqmp: Let fsbl_atf_handover() return an error status

Instead of calling panic() in fsbl_atf_handover() return the error
status so that bl31_early_platform_setup() can act accordingly.
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>

plat/xilinx/zynqmp/bl31_zynqmp_setup.c

@@ -77,7 +77,10 @@ void bl31_early_platform_setup(bl31_params_t *from_bl2,
 						  DISABLE_ALL_EXCEPTIONS);
 	} else {
 		/* use parameters from FSBL */
-		fsbl_atf_handover(&bl32_image_ep_info, &bl33_image_ep_info);
+		enum fsbl_handoff ret = fsbl_atf_handover(&bl32_image_ep_info,
+							  &bl33_image_ep_info);
+		if (ret != FSBL_HANDOFF_SUCCESS)
+			panic();
 	}
 
 	NOTICE("BL31: Secure code at 0x%lx\n", bl32_image_ep_info.pc);

plat/xilinx/zynqmp/plat_startup.c

@@ -9,6 +9,7 @@
 #include <debug.h>
 #include <mmio.h>
 #include "zynqmp_def.h"
+#include "zynqmp_private.h"
 
 /*
  * ATFHandoffParams
@@ -147,8 +148,11 @@ static int get_fsbl_estate(const struct xfsbl_partition *partition)
  *
  * Process the handoff paramters from the FSBL and populate the BL32 and BL33
  * image info structures accordingly.
+ *
+ * Return: Return the status of the handoff. The value will be from the
+ *         fsbl_handoff enum.
  */
-void fsbl_atf_handover(entry_point_info_t *bl32, entry_point_info_t *bl33)
+enum fsbl_handoff fsbl_atf_handover(entry_point_info_t *bl32, entry_point_info_t *bl33)
 {
 	uint64_t atf_handoff_addr;
 	const struct xfsbl_atf_handoff_params *ATFHandoffParams;
@@ -158,7 +162,7 @@ void fsbl_atf_handover(entry_point_info_t *bl32, entry_point_info_t *bl33)
 	       (atf_handoff_addr > (uint64_t)&__BL31_END__));
 	if (!atf_handoff_addr) {
 		ERROR("BL31: No ATF handoff structure passed\n");
-		panic();
+		return FSBL_HANDOFF_NO_STRUCT;
 	}
 
 	ATFHandoffParams = (struct xfsbl_atf_handoff_params *)atf_handoff_addr;
@@ -168,7 +172,7 @@ void fsbl_atf_handover(entry_point_info_t *bl32, entry_point_info_t *bl33)
 	    (ATFHandoffParams->magic[3] != 'X')) {
 		ERROR("BL31: invalid ATF handoff structure at %llx\n",
 		      atf_handoff_addr);
-		panic();
+		return FSBL_HANDOFF_INVAL_STRUCT;
 	}
 
 	VERBOSE("BL31: ATF handoff params at:0x%llx, entries:%u\n",
@@ -176,7 +180,7 @@ void fsbl_atf_handover(entry_point_info_t *bl32, entry_point_info_t *bl33)
 	if (ATFHandoffParams->num_entries > FSBL_MAX_PARTITIONS) {
 		ERROR("BL31: ATF handoff params: too many partitions (%u/%u)\n",
 		      ATFHandoffParams->num_entries, FSBL_MAX_PARTITIONS);
-		panic();
+		return FSBL_HANDOFF_TOO_MANY_PARTS;
 	}
 
 	/*
@@ -261,4 +265,6 @@ void fsbl_atf_handover(entry_point_info_t *bl32, entry_point_info_t *bl33)
 		else
 			EP_SET_EE(image->h.attr, EP_EE_LITTLE);
 	}
+
+	return FSBL_HANDOFF_SUCCESS;
 }

plat/xilinx/zynqmp/zynqmp_private.h

@@ -18,7 +18,14 @@ int zynqmp_is_pmu_up(void);
 unsigned int zynqmp_get_bootmode(void);
 
 /* For FSBL handover */
-void fsbl_atf_handover(entry_point_info_t *bl32_image_ep_info,
+enum fsbl_handoff {
+	FSBL_HANDOFF_SUCCESS = 0,
+	FSBL_HANDOFF_NO_STRUCT,
+	FSBL_HANDOFF_INVAL_STRUCT,
+	FSBL_HANDOFF_TOO_MANY_PARTS,
+};
+
+enum fsbl_handoff fsbl_atf_handover(entry_point_info_t *bl32_image_ep_info,
 		       entry_point_info_t *bl33_image_ep_info);
 
 #endif /* __ZYNQMP_PRIVATE_H__ */