sh: Support fixed 32-bit PMB mappings from bootloader.

This provides a method for supporting fixed PMB mappings inherited from
the bootloader, as an alternative to the dynamic PMB mapping currently
used by the kernel. In the future these methods will be combined.

P1/P2 area is handled like a regular 29-bit physical address, and local
bus device are assigned P3 area addresses.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/sh/mm/ioremap_32.c b/arch/sh/mm/ioremap_32.c
index 8dc77026a0b..60cc486d2c2 100644
--- a/arch/sh/mm/ioremap_32.c
+++ b/arch/sh/mm/ioremap_32.c
@@ -59,11 +59,13 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
         if (is_pci_memaddr(phys_addr) && is_pci_memaddr(last_addr))
                 return (void __iomem *)phys_addr;
 
+#if !defined(CONFIG_PMB_FIXED)
         /*
          * Don't allow anybody to remap normal RAM that we're using..
          */
         if (phys_addr < virt_to_phys(high_memory))
                 return NULL;
+#endif
 
         /*
          * Mappings have to be page-aligned
@@ -81,7 +83,7 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
         area->phys_addr = phys_addr;
         orig_addr = addr = (unsigned long)area->addr;
 
-#ifdef CONFIG_32BIT
+#ifdef CONFIG_PMB
         /*
          * First try to remap through the PMB once a valid VMA has been
          * established. Smaller allocations (or the rest of the size
@@ -122,7 +124,7 @@ void __iounmap(void __iomem *addr)
         if (seg < P3SEG || vaddr >= P3_ADDR_MAX || is_pci_memaddr(vaddr))
                 return;
 
-#ifdef CONFIG_32BIT
+#ifdef CONFIG_PMB
         /*
          * Purge any PMB entries that may have been established for this
          * mapping, then proceed with conventional VMA teardown.