lib: add GENERIC_PCI_IOMAP

Many architectures want a generic pci_iomap but
not the rest of iomap.c. Split that to a separate .c
file and add a new config symbol. select automatically
by GENERIC_IOMAP.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 2 insertions, 36 deletions

diff --git a/lib/iomap.c b/lib/iomap.c
index 5dbcb4b2d864..ada922a808e6 100644
--- a/lib/iomap.c
+++ b/lib/iomap.c
@@ -242,45 +242,11 @@ EXPORT_SYMBOL(ioport_unmap);
 #endif /* CONFIG_HAS_IOPORT */
 
 #ifdef CONFIG_PCI
-/**
- * pci_iomap - create a virtual mapping cookie for a PCI BAR
- * @dev: PCI device that owns the BAR
- * @bar: BAR number
- * @maxlen: length of the memory to map
- *
- * Using this function you will get a __iomem address to your device BAR.
- * You can access it using ioread*() and iowrite*(). These functions hide
- * the details if this is a MMIO or PIO address space and will just do what
- * you expect from them in the correct way.
- *
- * @maxlen specifies the maximum length to map. If you want to get access to
- * the complete BAR without checking for its length first, pass %0 here.
- * */
-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) {
-                if (flags & IORESOURCE_CACHEABLE)
-                        return ioremap(start, len);
-                return ioremap_nocache(start, len);
-        }
-        /* What? */
-        return NULL;
-}
-
+/* Hide the details if this is a MMIO or PIO address space and just do what
+ * you expect in the correct way. */
 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
 {
         IO_COND(addr, /* nothing */, iounmap(addr));
 }
-EXPORT_SYMBOL(pci_iomap);
 EXPORT_SYMBOL(pci_iounmap);
 #endif /* CONFIG_PCI */