soc/intel/xeon_sp: Change the return type of get_iio_stack_info()

The somewhat unrelated return value makes the function harder to
understand and the return type is not consistently used. Use a
different helper function to get the HOB Pci64BitResourceAllocation
data.

Change-Id: I9a03cbb0ebbb48cc052d4c082d359c0087aaeb3e
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47298
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

src/soc/intel/xeon_sp/chip_common.c

@@ -403,6 +403,13 @@ static void assign_stack_resources(struct iiostack_resource *stack_list,
 	}
 }
 
+static uint8_t is_pci64bit_alloc(void)
+{
+	const IIO_UDS *hob = get_iio_uds();
+
+	return hob->PlatformData.Pci64BitResourceAllocation;
+}
+
 static void xeonsp_pci_domain_read_resources(struct device *dev)
 {
 	struct bus *link;
@@ -425,8 +432,8 @@ static void xeonsp_pci_domain_read_resources(struct device *dev)
 		xeonsp_pci_dev_iterator(link, xeonsp_reset_pci_op, NULL, NULL);
 
 	struct iiostack_resource stack_info = {0};
-	uint8_t pci64bit_alloc_flag = get_iiostack_info(&stack_info);
-	if (!pci64bit_alloc_flag) {
+	get_iiostack_info(&stack_info);
+	if (!is_pci64bit_alloc()) {
 		/*
 		 * Split 32 bit address space between prefetchable and
 		 * non-prefetchable windows

src/soc/intel/xeon_sp/cpx/include/soc/soc_util.h

@@ -11,7 +11,7 @@ struct iiostack_resource {
 	STACK_RES   res[MAX_SOCKET * MAX_LOGIC_IIO_STACK];
 };
 
-uint8_t get_iiostack_info(struct iiostack_resource *info);
+void get_iiostack_info(struct iiostack_resource *info);
 
 const struct SystemMemoryMapHob *get_system_memory_map(void);
 

src/soc/intel/xeon_sp/cpx/soc_util.c

@@ -27,7 +27,7 @@ const struct SystemMemoryMapHob *get_system_memory_map(void)
 	return *memmap_addr;
 }
 
-uint8_t get_iiostack_info(struct iiostack_resource *info)
+void get_iiostack_info(struct iiostack_resource *info)
 {
 	const IIO_UDS *hob = get_iio_uds();
 
@@ -42,8 +42,6 @@ uint8_t get_iiostack_info(struct iiostack_resource *info)
 			}
 		}
 	}
-
-	return hob->PlatformData.Pci64BitResourceAllocation;
 }
 
 uint32_t get_socket_stack_busno(uint32_t socket, uint32_t stack)

src/soc/intel/xeon_sp/skx/include/soc/soc_util.h

@@ -11,7 +11,7 @@ struct iiostack_resource {
 	STACK_RES   res[CONFIG_MAX_SOCKET * MAX_IIO_STACK];
 };
 
-uint8_t get_iiostack_info(struct iiostack_resource *info);
+void get_iiostack_info(struct iiostack_resource *info);
 
 void config_reset_cpl3_csrs(void);
 

src/soc/intel/xeon_sp/skx/soc_util.c

@@ -55,7 +55,7 @@ const struct SystemMemoryMapHob *get_system_memory_map(void)
 	return memmap_addr;
 }
 
-uint8_t get_iiostack_info(struct iiostack_resource *info)
+void get_iiostack_info(struct iiostack_resource *info)
 {
 	const IIO_UDS *hob = get_iio_uds();
 
@@ -71,8 +71,6 @@ uint8_t get_iiostack_info(struct iiostack_resource *info)
 			memcpy(&info->res[info->no_of_stacks++], ri, sizeof(STACK_RES));
 		}
 	}
-
-	return hob->PlatformData.Pci64BitResourceAllocation;
 }
 
 uint32_t get_socket_stack_busno(uint32_t socket, uint32_t stack)