alpha: switch to GENERIC_PCI_IOMAP

alpha copied pci_iomap from generic code to avoid
pulling the rest of iomap.c in.  Since that's in
a separate file now, we can reuse the common implementation.

The only difference is handling of nocache flag,
that turns out to be done correctly by the
generic code since arch/alpha/include/asm/io.h
defines ioremap_nocache same as ioremap.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

arch/alpha/Kconfig

@@ -315,6 +315,7 @@ config ISA_DMA_API
 config PCI
 	bool
 	depends on !ALPHA_JENSEN
+	select GENERIC_PCI_IOMAP
 	default y
 	help
 	  Find out whether you have a PCI motherboard. PCI is the name of a

arch/alpha/kernel/pci.c

@@ -508,30 +508,7 @@ sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
 	return -EOPNOTSUPP;
 }
 
-/* Create an __iomem token from a PCI BAR.  Copied from lib/iomap.c with
-   no changes, since we don't want the other things in that object file.  */
-
-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(start, len);
-	if (flags & IORESOURCE_MEM) {
-		/* Not checking IORESOURCE_CACHEABLE because alpha does
-		   not distinguish between ioremap and ioremap_nocache.  */
-		return ioremap(start, len);
-	}
-	return NULL;
-}
-
-/* Destroy that token.  Not copied from lib/iomap.c.  */
+/* Destroy an __iomem token.  Not copied from lib/iomap.c.  */
 
 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
 {
@@ -539,7 +516,6 @@ void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
 		iounmap(addr);
 }
 
-EXPORT_SYMBOL(pci_iomap);
 EXPORT_SYMBOL(pci_iounmap);
 
 /* FIXME: Some boxes have multiple ISA bridges! */