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authorMagnus Damm <magnus.damm@gmail.com>2008-02-07 20:18:21 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-02-14 14:22:09 +0900
commite7cc9a7340b8ec018caa9eb1d035fdaef1f2fc51 (patch)
treea797888f8d3f95734288978351c33af3c965494c /include/asm-sh/io.h
parent2ade1a9b425c24037327197ea97db054395b536b (diff)
downloadop-kernel-dev-e7cc9a7340b8ec018caa9eb1d035fdaef1f2fc51.zip
op-kernel-dev-e7cc9a7340b8ec018caa9eb1d035fdaef1f2fc51.tar.gz
sh: trapped io support V2
The idea is that we want to get rid of the in/out/readb/writeb callbacks from the machvec and replace that with simple inline read and write operations to memory. Fast and simple for most hardware devices (think pci). Some devices require special treatment though - like 16-bit only CF devices - so we need to have some method to hook in callbacks. This patch makes it possible to add a per-device trap generating filter. This way we can get maximum performance of sane hardware - which doesn't need this filter - and crappy hardware works but gets punished by a performance hit. V2 changes things around a bit and replaces io access callbacks with a simple minimum_bus_width value. In the future we can add stride as well. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include/asm-sh/io.h')
-rw-r--r--include/asm-sh/io.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-sh/io.h b/include/asm-sh/io.h
index 94900c0..3d2b114 100644
--- a/include/asm-sh/io.h
+++ b/include/asm-sh/io.h
@@ -38,6 +38,7 @@
*/
#define __IO_PREFIX generic
#include <asm/io_generic.h>
+#include <asm/io_trapped.h>
#define maybebadio(port) \
printk(KERN_ERR "bad PC-like io %s:%u for port 0x%lx at 0x%08x\n", \
@@ -207,6 +208,8 @@ static inline void __set_io_port_base(unsigned long pbase)
generic_io_base = pbase;
}
+#define __ioport_map(p, n) sh_mv.mv_ioport_map((p), (n))
+
/* We really want to try and get these to memcpy etc */
extern void memcpy_fromio(void *, volatile void __iomem *, unsigned long);
extern void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
@@ -309,7 +312,14 @@ __ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
{
#ifdef CONFIG_SUPERH32
unsigned long last_addr = offset + size - 1;
+#endif
+ void __iomem *ret;
+ ret = __ioremap_trapped(offset, size);
+ if (ret)
+ return ret;
+
+#ifdef CONFIG_SUPERH32
/*
* For P1 and P2 space this is trivial, as everything is already
* mapped. Uncached access for P1 addresses are done through P2.
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