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authorMagnus Damm <damm@igel.co.jp>2008-11-25 21:57:29 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-12-22 18:43:48 +0900
commit716777db7270255f1f7210fd87a7188b08c9a267 (patch)
tree01e65e44140231a2b16d7ebd273e7e7b280decb7 /arch/sh/mm/ioremap_32.c
parent0c9122323acb0c3410dfbd219cb47f4c2e9305e3 (diff)
sh: P4 ioremap pass-through
This patch adds a pass-through case when ioremapping P4 addresses. Addresses passed to ioremap() should be physical addresses, so the best option is usually to convert the virtual address to a physical address before calling ioremap. This will give you a virtual address in P2 which matches the physical address and this works well for most internal hardware blocks on the SuperH architecture. However, some hardware blocks must be accessed through P4. Converting the P4 address to a physical and then back to a P2 does not work. One example of this is the sh7722 TMU block, it must be accessed through P4. Without this patch P4 addresses will be mapped using PTEs which requires the page allocator to be up and running. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm/ioremap_32.c')
-rw-r--r--arch/sh/mm/ioremap_32.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/sh/mm/ioremap_32.c b/arch/sh/mm/ioremap_32.c
index 882a32ebc6b..32946fba123 100644
--- a/arch/sh/mm/ioremap_32.c
+++ b/arch/sh/mm/ioremap_32.c
@@ -116,9 +116,10 @@ EXPORT_SYMBOL(__ioremap);
void __iounmap(void __iomem *addr)
{
unsigned long vaddr = (unsigned long __force)addr;
+ unsigned long seg = PXSEG(vaddr);
struct vm_struct *p;
- if (PXSEG(vaddr) < P3SEG || is_pci_memaddr(vaddr))
+ if (seg < P3SEG || seg >= P3_ADDR_MAX || is_pci_memaddr(vaddr))
return;
#ifdef CONFIG_32BIT