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authorPaul Mundt <lethal@linux-sh.org>2006-09-27 16:45:22 +0900
committerPaul Mundt <lethal@linux-sh.org>2006-09-27 16:45:22 +0900
commita3e61d50dc82475ebca3ff8b18c174c02c5ff511 (patch)
treed7a39867983b0bca5619cfe7493358e6bde6f3ba /arch/sh/mm
parent959f85f8a3223c116bbe95dd8a9b207790b5d4d3 (diff)
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sh: Inhibit mapping PCI apertures through page tables.
Inhibit mapping through page tables in __ioremap() for PCI memory apertures on SH7751 and SH7780-style PCI controllers, translation is not possible for these areas. For other users that map a small window in P1/P2 space, ioremap() traps that already, and should never make it to __ioremap(). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm')
-rw-r--r--arch/sh/mm/ioremap.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index 96fa4a999e2..a9fe80cfc23 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -15,6 +15,7 @@
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/mm.h>
+#include <linux/pci.h>
#include <asm/io.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
@@ -135,6 +136,20 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
return (void __iomem *)phys_to_virt(phys_addr);
/*
+ * If we're on an SH7751 or SH7780 PCI controller, PCI memory is
+ * mapped at the end of the address space (typically 0xfd000000)
+ * in a non-translatable area, so mapping through page tables for
+ * this area is not only pointless, but also fundamentally
+ * broken. Just return the physical address instead.
+ *
+ * For boards that map a small PCI memory aperture somewhere in
+ * P1/P2 space, ioremap() will already do the right thing,
+ * and we'll never get this far.
+ */
+ if (is_pci_memaddr(phys_addr) && is_pci_memaddr(last_addr))
+ return (void __iomem *)phys_addr;
+
+ /*
* Don't allow anybody to remap normal RAM that we're using..
*/
if (phys_addr < virt_to_phys(high_memory))
@@ -192,7 +207,7 @@ void __iounmap(void __iomem *addr)
unsigned long vaddr = (unsigned long __force)addr;
struct vm_struct *p;
- if (PXSEG(vaddr) < P3SEG)
+ if (PXSEG(vaddr) < P3SEG || is_pci_memaddr(vaddr))
return;
#ifdef CONFIG_32BIT