microblaze/PCI: Remove unused device tree parsing for a host bridge resources

Remove unused pci_process_bridge_OF_ranges function, used to
parse the "ranges" property of a PCI host device.

Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@amd.com>
Link: https://lore.kernel.org/r/20221025065214.4663-6-thippeswamy.havalige@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

3 files changed, 0 insertions, 181 deletions

diff --git a/arch/microblaze/include/asm/pci-bridge.h b/arch/microblaze/include/asm/pci-bridge.h
index ce74b0c52be2..252bcc14c863 100644
--- a/arch/microblaze/include/asm/pci-bridge.h
+++ b/arch/microblaze/include/asm/pci-bridge.h
@@ -38,20 +38,11 @@ struct pci_controller {
 	void __iomem *io_base_virt;
 	resource_size_t io_base_phys;
 
-	resource_size_t pci_io_size;
-
 	/* Some machines (PReP) have a non 1:1 mapping of
 	 * the PCI memory space in the CPU bus space
 	 */
 	resource_size_t pci_mem_offset;
 
-	/* Some machines have a special region to forward the ISA
-	 * "memory" cycles such as VGA memory regions. Left to 0
-	 * if unsupported
-	 */
-	resource_size_t isa_mem_phys;
-	resource_size_t isa_mem_size;
-
 	struct pci_ops *ops;
 	unsigned int __iomem *cfg_addr;
 	void __iomem *cfg_data;
@@ -107,10 +98,6 @@ extern void setup_indirect_pci(struct pci_controller *hose,
 			       resource_size_t cfg_addr,
 			       resource_size_t cfg_data, u32 flags);
 
-/* Fill up host controller resources from the OF node */
-extern void pci_process_bridge_OF_ranges(struct pci_controller *hose,
-			struct device_node *dev, int primary);
-
 /* Allocate & free a PCI host bridge structure */
 extern struct pci_controller *pcibios_alloc_controller(struct device_node *dev);
 extern void pcibios_free_controller(struct pci_controller *phb);
diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
index ef4a9fc3377f..12764df0472e 100644
--- a/arch/microblaze/pci/pci-common.c
+++ b/arch/microblaze/pci/pci-common.c
@@ -171,169 +171,6 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
 	*end = rsrc->end;
 }
 
-/**
- * pci_process_bridge_OF_ranges - Parse PCI bridge resources from device tree
- * @hose: newly allocated pci_controller to be setup
- * @dev: device node of the host bridge
- * @primary: set if primary bus (32 bits only, soon to be deprecated)
- *
- * This function will parse the "ranges" property of a PCI host bridge device
- * node and setup the resource mapping of a pci controller based on its
- * content.
- *
- * Life would be boring if it wasn't for a few issues that we have to deal
- * with here:
- *
- *   - We can only cope with one IO space range and up to 3 Memory space
- *     ranges. However, some machines (thanks Apple !) tend to split their
- *     space into lots of small contiguous ranges. So we have to coalesce.
- *
- *   - We can only cope with all memory ranges having the same offset
- *     between CPU addresses and PCI addresses. Unfortunately, some bridges
- *     are setup for a large 1:1 mapping along with a small "window" which
- *     maps PCI address 0 to some arbitrary high address of the CPU space in
- *     order to give access to the ISA memory hole.
- *     The way out of here that I've chosen for now is to always set the
- *     offset based on the first resource found, then override it if we
- *     have a different offset and the previous was set by an ISA hole.
- *
- *   - Some busses have IO space not starting at 0, which causes trouble with
- *     the way we do our IO resource renumbering. The code somewhat deals with
- *     it for 64 bits but I would expect problems on 32 bits.
- *
- *   - Some 32 bits platforms such as 4xx can have physical space larger than
- *     32 bits so we need to use 64 bits values for the parsing
- */
-void pci_process_bridge_OF_ranges(struct pci_controller *hose,
-				  struct device_node *dev, int primary)
-{
-	int memno = 0, isa_hole = -1;
-	unsigned long long isa_mb = 0;
-	struct resource *res;
-	struct of_pci_range range;
-	struct of_pci_range_parser parser;
-
-	pr_info("PCI host bridge %pOF %s ranges:\n",
-	       dev, primary ? "(primary)" : "");
-
-	/* Check for ranges property */
-	if (of_pci_range_parser_init(&parser, dev))
-		return;
-
-	pr_debug("Parsing ranges property...\n");
-	for_each_of_pci_range(&parser, &range) {
-		/* Read next ranges element */
-
-		/* If we failed translation or got a zero-sized region
-		 * (some FW try to feed us with non sensical zero sized regions
-		 * such as power3 which look like some kind of attempt
-		 * at exposing the VGA memory hole)
-		 */
-		if (range.cpu_addr == OF_BAD_ADDR || range.size == 0)
-			continue;
-
-		/* Act based on address space type */
-		res = NULL;
-		switch (range.flags & IORESOURCE_TYPE_BITS) {
-		case IORESOURCE_IO:
-			pr_info("  IO 0x%016llx..0x%016llx -> 0x%016llx\n",
-				range.cpu_addr, range.cpu_addr + range.size - 1,
-				range.pci_addr);
-
-			/* We support only one IO range */
-			if (hose->pci_io_size) {
-				pr_info(" \\--> Skipped (too many) !\n");
-				continue;
-			}
-			/* On 32 bits, limit I/O space to 16MB */
-			if (range.size > 0x01000000)
-				range.size = 0x01000000;
-
-			/* 32 bits needs to map IOs here */
-			hose->io_base_virt = ioremap(range.cpu_addr,
-						range.size);
-
-			/* Expect trouble if pci_addr is not 0 */
-			if (primary)
-				isa_io_base =
-					(unsigned long)hose->io_base_virt;
-			/* pci_io_size and io_base_phys always represent IO
-			 * space starting at 0 so we factor in pci_addr
-			 */
-			hose->pci_io_size = range.pci_addr + range.size;
-			hose->io_base_phys = range.cpu_addr - range.pci_addr;
-
-			/* Build resource */
-			res = &hose->io_resource;
-			range.cpu_addr = range.pci_addr;
-
-			break;
-		case IORESOURCE_MEM:
-			pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx %s\n",
-				range.cpu_addr, range.cpu_addr + range.size - 1,
-				range.pci_addr,
-				(range.flags & IORESOURCE_PREFETCH) ?
-				"Prefetch" : "");
-
-			/* We support only 3 memory ranges */
-			if (memno >= 3) {
-				pr_info(" \\--> Skipped (too many) !\n");
-				continue;
-			}
-			/* Handles ISA memory hole space here */
-			if (range.pci_addr == 0) {
-				isa_mb = range.cpu_addr;
-				isa_hole = memno;
-				if (primary || isa_mem_base == 0)
-					isa_mem_base = range.cpu_addr;
-				hose->isa_mem_phys = range.cpu_addr;
-				hose->isa_mem_size = range.size;
-			}
-
-			/* We get the PCI/Mem offset from the first range or
-			 * the, current one if the offset came from an ISA
-			 * hole. If they don't match, bugger.
-			 */
-			if (memno == 0 ||
-			    (isa_hole >= 0 && range.pci_addr != 0 &&
-			     hose->pci_mem_offset == isa_mb))
-				hose->pci_mem_offset = range.cpu_addr -
-							range.pci_addr;
-			else if (range.pci_addr != 0 &&
-				 hose->pci_mem_offset != range.cpu_addr -
-							range.pci_addr) {
-				pr_info(" \\--> Skipped (offset mismatch) !\n");
-				continue;
-			}
-
-			/* Build resource */
-			res = &hose->mem_resources[memno++];
-			break;
-		}
-		if (res != NULL) {
-			res->name = dev->full_name;
-			res->flags = range.flags;
-			res->start = range.cpu_addr;
-			res->end = range.cpu_addr + range.size - 1;
-			res->parent = res->child = res->sibling = NULL;
-		}
-	}
-
-	/* If there's an ISA hole and the pci_mem_offset is -not- matching
-	 * the ISA hole offset, then we need to remove the ISA hole from
-	 * the resource list for that brige
-	 */
-	if (isa_hole >= 0 && hose->pci_mem_offset != isa_mb) {
-		unsigned int next = isa_hole + 1;
-		pr_info(" Removing ISA hole at 0x%016llx\n", isa_mb);
-		if (next < memno)
-			memmove(&hose->mem_resources[isa_hole],
-				&hose->mem_resources[next],
-				sizeof(struct resource) * (memno - next));
-		hose->mem_resources[--memno].flags = 0;
-	}
-}
-
 /* Display the domain number in /proc */
 int pci_proc_domain(struct pci_bus *bus)
 {
diff --git a/arch/microblaze/pci/xilinx_pci.c b/arch/microblaze/pci/xilinx_pci.c
index 7ed664723f7c..f1a51129b94c 100644
--- a/arch/microblaze/pci/xilinx_pci.c
+++ b/arch/microblaze/pci/xilinx_pci.c
@@ -114,9 +114,4 @@ void __init xilinx_pci_init(void)
 	out_be32(pci_reg + XPLB_PCI_BUS, 0x000000ff);
 	iounmap(pci_reg);
 
-	/* Register the host bridge with the linux kernel! */
-	pci_process_bridge_OF_ranges(hose, pci_node,
-					INDIRECT_TYPE_SET_CFG_TYPE);
-
-	pr_info("xilinx-pci: Registered PCI host bridge\n");
 }