of/address: merge of_address_to_resource()

Merge common code between PowerPC and Microblaze.  This patch also
moves the prototype of pci_address_to_pio() out of pci-bridge.h and
into prom.h because the only user of pci_address_to_pio() is
of_address_to_resource().

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Michal Simek <monstr@monstr.eu>
CC: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 258528d6c4fe..c3819550f907 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -3,6 +3,57 @@
 #include <linux/ioport.h>
 #include <linux/of_address.h>
 
+int __of_address_to_resource(struct device_node *dev, const u32 *addrp,
+                             u64 size, unsigned int flags,
+                             struct resource *r)
+{
+        u64 taddr;
+
+        if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
+                return -EINVAL;
+        taddr = of_translate_address(dev, addrp);
+        if (taddr == OF_BAD_ADDR)
+                return -EINVAL;
+        memset(r, 0, sizeof(struct resource));
+        if (flags & IORESOURCE_IO) {
+                unsigned long port;
+                port = pci_address_to_pio(taddr);
+                if (port == (unsigned long)-1)
+                        return -EINVAL;
+                r->start = port;
+                r->end = port + size - 1;
+        } else {
+                r->start = taddr;
+                r->end = taddr + size - 1;
+        }
+        r->flags = flags;
+        r->name = dev->name;
+        return 0;
+}
+
+/**
+ * of_address_to_resource - Translate device tree address and return as resource
+ *
+ * Note that if your address is a PIO address, the conversion will fail if
+ * the physical address can't be internally converted to an IO token with
+ * pci_address_to_pio(), that is because it's either called to early or it
+ * can't be matched to any host bridge IO space
+ */
+int of_address_to_resource(struct device_node *dev, int index,
+                           struct resource *r)
+{
+        const u32       *addrp;
+        u64             size;
+        unsigned int    flags;
+
+        addrp = of_get_address(dev, index, &size, &flags);
+        if (addrp == NULL)
+                return -EINVAL;
+        return __of_address_to_resource(dev, addrp, size, flags, r);
+}
+EXPORT_SYMBOL_GPL(of_address_to_resource);
+
+
 /**
  * of_iomap - Maps the memory mapped IO for a given device_node
  * @device:     the device whose io range will be mapped