microblaze/PCI: Remove unused PCI legacy IO's access on a bus

Remove PCI legacy read,write and mmap access IO's
on a bus
Signed-off-by: Thippeswamy Havalige <thippeswamy.havalige@amd.com>
Link: https://lore.kernel.org/r/20221025065214.4663-5-thippeswamy.havalige@amd.comSigned-off-by: Michal Simek <michal.simek@amd.com>

arch/microblaze/include/asm/pci.h

@@ -48,16 +48,6 @@ struct vm_area_struct;
 #define ARCH_GENERIC_PCI_MMAP_RESOURCE	1
 #define arch_can_pci_mmap_io()		1
 
-extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val,
-			   size_t count);
-extern int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val,
-			   size_t count);
-extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
-				      struct vm_area_struct *vma,
-				      enum pci_mmap_state mmap_state);
-
-#define HAVE_PCI_LEGACY	1
-
 extern void pcibios_resource_survey(void);
 
 struct file;

arch/microblaze/pci/pci-common.c

@@ -146,146 +146,6 @@ int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct *vma)
 	return 0;
 }
 
-/* This provides legacy IO read access on a bus */
-int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
-{
-	unsigned long offset;
-	struct pci_controller *hose = pci_bus_to_host(bus);
-	struct resource *rp = &hose->io_resource;
-	void __iomem *addr;
-
-	/* Check if port can be supported by that bus. We only check
-	 * the ranges of the PHB though, not the bus itself as the rules
-	 * for forwarding legacy cycles down bridges are not our problem
-	 * here. So if the host bridge supports it, we do it.
-	 */
-	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
-	offset += port;
-
-	if (!(rp->flags & IORESOURCE_IO))
-		return -ENXIO;
-	if (offset < rp->start || (offset + size) > rp->end)
-		return -ENXIO;
-	addr = hose->io_base_virt + port;
-
-	switch (size) {
-	case 1:
-		*((u8 *)val) = in_8(addr);
-		return 1;
-	case 2:
-		if (port & 1)
-			return -EINVAL;
-		*((u16 *)val) = in_le16(addr);
-		return 2;
-	case 4:
-		if (port & 3)
-			return -EINVAL;
-		*((u32 *)val) = in_le32(addr);
-		return 4;
-	}
-	return -EINVAL;
-}
-
-/* This provides legacy IO write access on a bus */
-int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
-{
-	unsigned long offset;
-	struct pci_controller *hose = pci_bus_to_host(bus);
-	struct resource *rp = &hose->io_resource;
-	void __iomem *addr;
-
-	/* Check if port can be supported by that bus. We only check
-	 * the ranges of the PHB though, not the bus itself as the rules
-	 * for forwarding legacy cycles down bridges are not our problem
-	 * here. So if the host bridge supports it, we do it.
-	 */
-	offset = (unsigned long)hose->io_base_virt - _IO_BASE;
-	offset += port;
-
-	if (!(rp->flags & IORESOURCE_IO))
-		return -ENXIO;
-	if (offset < rp->start || (offset + size) > rp->end)
-		return -ENXIO;
-	addr = hose->io_base_virt + port;
-
-	/* WARNING: The generic code is idiotic. It gets passed a pointer
-	 * to what can be a 1, 2 or 4 byte quantity and always reads that
-	 * as a u32, which means that we have to correct the location of
-	 * the data read within those 32 bits for size 1 and 2
-	 */
-	switch (size) {
-	case 1:
-		out_8(addr, val >> 24);
-		return 1;
-	case 2:
-		if (port & 1)
-			return -EINVAL;
-		out_le16(addr, val >> 16);
-		return 2;
-	case 4:
-		if (port & 3)
-			return -EINVAL;
-		out_le32(addr, val);
-		return 4;
-	}
-	return -EINVAL;
-}
-
-/* This provides legacy IO or memory mmap access on a bus */
-int pci_mmap_legacy_page_range(struct pci_bus *bus,
-			       struct vm_area_struct *vma,
-			       enum pci_mmap_state mmap_state)
-{
-	struct pci_controller *hose = pci_bus_to_host(bus);
-	resource_size_t offset =
-		((resource_size_t)vma->vm_pgoff) << PAGE_SHIFT;
-	resource_size_t size = vma->vm_end - vma->vm_start;
-	struct resource *rp;
-
-	pr_debug("pci_mmap_legacy_page_range(%04x:%02x, %s @%llx..%llx)\n",
-		 pci_domain_nr(bus), bus->number,
-		 mmap_state == pci_mmap_mem ? "MEM" : "IO",
-		 (unsigned long long)offset,
-		 (unsigned long long)(offset + size - 1));
-
-	if (mmap_state == pci_mmap_mem) {
-		/* Hack alert !
-		 *
-		 * Because X is lame and can fail starting if it gets an error
-		 * trying to mmap legacy_mem (instead of just moving on without
-		 * legacy memory access) we fake it here by giving it anonymous
-		 * memory, effectively behaving just like /dev/zero
-		 */
-		if ((offset + size) > hose->isa_mem_size) {
-			pr_debug("Process %s (pid:%d) mapped non-existing PCI",
-				current->comm, current->pid);
-			pr_debug("legacy memory for 0%04x:%02x\n",
-				pci_domain_nr(bus), bus->number);
-			if (vma->vm_flags & VM_SHARED)
-				return shmem_zero_setup(vma);
-			return 0;
-		}
-		offset += hose->isa_mem_phys;
-	} else {
-		unsigned long io_offset = (unsigned long)hose->io_base_virt -
-								_IO_BASE;
-		unsigned long roffset = offset + io_offset;
-		rp = &hose->io_resource;
-		if (!(rp->flags & IORESOURCE_IO))
-			return -ENXIO;
-		if (roffset < rp->start || (roffset + size) > rp->end)
-			return -ENXIO;
-		offset += hose->io_base_phys;
-	}
-	pr_debug(" -> mapping phys %llx\n", (unsigned long long)offset);
-
-	vma->vm_pgoff = offset >> PAGE_SHIFT;
-	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
-			       vma->vm_end - vma->vm_start,
-			       vma->vm_page_prot);
-}
-
 void pci_resource_to_user(const struct pci_dev *dev, int bar,
 			  const struct resource *rsrc,
 			  resource_size_t *start, resource_size_t *end)