mips: switch to GENERIC_PCI_IOMAP

mips copied pci_iomap from generic code, probably to avoid
pulling the rest of iomap.c in.  Since that's in
a separate file now, we can reuse the common implementation.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

arch/mips/Kconfig

@@ -2317,6 +2317,7 @@ config PCI
 	bool "Support for PCI controller"
 	depends on HW_HAS_PCI
 	select PCI_DOMAINS
+	select GENERIC_PCI_IOMAP
 	help
 	  Find out whether you have a PCI motherboard. PCI is the name of a
 	  bus system, i.e. the way the CPU talks to the other stuff inside

arch/mips/lib/iomap-pci.c

@@ -40,32 +40,6 @@ static void __iomem *ioport_map_pci(struct pci_dev *dev,
 	return (void __iomem *) (ctrl->io_map_base + port);
 }
 
-/*
- * Create a virtual mapping cookie for a PCI BAR (memory or IO)
- */
-void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
-{
-	resource_size_t start = pci_resource_start(dev, bar);
-	resource_size_t len = pci_resource_len(dev, bar);
-	unsigned long flags = pci_resource_flags(dev, bar);
-
-	if (!len || !start)
-		return NULL;
-	if (maxlen && len > maxlen)
-		len = maxlen;
-	if (flags & IORESOURCE_IO)
-		return ioport_map_pci(dev, start, len);
-	if (flags & IORESOURCE_MEM) {
-		if (flags & IORESOURCE_CACHEABLE)
-			return ioremap(start, len);
-		return ioremap_nocache(start, len);
-	}
-	/* What? */
-	return NULL;
-}
-
-EXPORT_SYMBOL(pci_iomap);
-
 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
 {
 	iounmap(addr);