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Date: Sun, 05 Nov 2006 14:32:13 +1100
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Linus Torvalds <torvalds@...l.org>
Cc: Russell King <rmk+lkml@....linux.org.uk>,
Linux Kernel list <linux-kernel@...r.kernel.org>,
Jeff Garzik <jgarzik@...ox.com>, Andrew Morton <akpm@...l.org>,
"David S. Miller" <davem@...emloft.net>,
Paul Mackerras <paulus@...ba.org>
Subject: Re: lib/iomap.c mmio_{in,out}s* vs. __raw_* accessors
Make the generic lib/iomap.c use arch provided MMIO accessors when
available for big endian and repeat operations. Also while at it,
fix the *_be version which are currently broken for PIO
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---
And because a patch is better than a long email...
Index: linux-cell/lib/iomap.c
===================================================================
--- linux-cell.orig/lib/iomap.c 2006-11-05 14:21:29.000000000 +1100
+++ linux-cell/lib/iomap.c 2006-11-05 14:30:32.000000000 +1100
@@ -34,6 +34,71 @@
#define PIO_RESERVED 0x40000UL
#endif
+#ifndef HAVE_ARCH_FULL_MMIO_SET
+/*
+ * Allow arch to provide _be versions and "repeat" versions. If not, we
+ * define default implementations here
+ */
+#define readw_be(addr) be16_to_cpu(__raw_readw(addr))
+#define readl_be(addr) be32_to_cpu(__raw_readl(addr))
+#define writew_be(val, addr) __raw_writew(cpu_to_be16(val), addr)
+#define writel_be(val, addr) __raw_writel(cpu_to_be32(val), addr)
+
+/*
+ * These are the "repeat MMIO read/write" functions.
+ * Note the "__raw" accesses, since we don't want to
+ * convert to CPU byte order. We write in "IO byte
+ * order" (we also don't have IO barriers).
+ */
+static inline void readsb(void __iomem *addr, u8 *dst, int count)
+{
+ while (--count >= 0) {
+ u8 data = __raw_readb(addr);
+ *dst = data;
+ dst++;
+ }
+}
+static inline void readsw(void __iomem *addr, u16 *dst, int count)
+{
+ while (--count >= 0) {
+ u16 data = __raw_readw(addr);
+ *dst = data;
+ dst++;
+ }
+}
+static inline void readsl(void __iomem *addr, u32 *dst, int count)
+{
+ while (--count >= 0) {
+ u32 data = __raw_readl(addr);
+ *dst = data;
+ dst++;
+ }
+}
+
+static inline void writesb(void __iomem *addr, const u8 *src, int count)
+{
+ while (--count >= 0) {
+ __raw_writeb(*src, addr);
+ src++;
+ }
+}
+static inline void writesw(void __iomem *addr, const u16 *src, int count)
+{
+ while (--count >= 0) {
+ __raw_writew(*src, addr);
+ src++;
+ }
+}
+static inline void writesl(void __iomem *addr, const u32 *src, int count)
+{
+ while (--count >= 0) {
+ __raw_writel(*src, addr);
+ src++;
+ }
+}
+
+#endif /* !defined(HAVE_ARCH_FULL_MMIO_SET) */
+
/*
* Ugly macros are a way of life.
*/
@@ -60,7 +125,7 @@
}
unsigned int fastcall ioread16be(void __iomem *addr)
{
- IO_COND(addr, return inw(port), return be16_to_cpu(__raw_readw(addr)));
+ IO_COND(addr, return swab16(inw(port)), return readw_be(addr));
}
unsigned int fastcall ioread32(void __iomem *addr)
{
@@ -68,7 +133,7 @@
}
unsigned int fastcall ioread32be(void __iomem *addr)
{
- IO_COND(addr, return inl(port), return be32_to_cpu(__raw_readl(addr)));
+ IO_COND(addr, return swab32(inl(port)), return readl_be(addr));
}
EXPORT_SYMBOL(ioread8);
EXPORT_SYMBOL(ioread16);
@@ -86,7 +151,7 @@
}
void fastcall iowrite16be(u16 val, void __iomem *addr)
{
- IO_COND(addr, outw(val,port), __raw_writew(cpu_to_be16(val), addr));
+ IO_COND(addr, outw(swab16(val),port), writew_be(val, addr));
}
void fastcall iowrite32(u32 val, void __iomem *addr)
{
@@ -94,7 +159,7 @@
}
void fastcall iowrite32be(u32 val, void __iomem *addr)
{
- IO_COND(addr, outl(val,port), __raw_writel(cpu_to_be32(val), addr));
+ IO_COND(addr, outl(swab32(val),port), writel_be(val, addr));
}
EXPORT_SYMBOL(iowrite8);
EXPORT_SYMBOL(iowrite16);
@@ -102,70 +167,18 @@
EXPORT_SYMBOL(iowrite32);
EXPORT_SYMBOL(iowrite32be);
-/*
- * These are the "repeat MMIO read/write" functions.
- * Note the "__raw" accesses, since we don't want to
- * convert to CPU byte order. We write in "IO byte
- * order" (we also don't have IO barriers).
- */
-static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
-{
- while (--count >= 0) {
- u8 data = __raw_readb(addr);
- *dst = data;
- dst++;
- }
-}
-static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
-{
- while (--count >= 0) {
- u16 data = __raw_readw(addr);
- *dst = data;
- dst++;
- }
-}
-static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
-{
- while (--count >= 0) {
- u32 data = __raw_readl(addr);
- *dst = data;
- dst++;
- }
-}
-
-static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
-{
- while (--count >= 0) {
- __raw_writeb(*src, addr);
- src++;
- }
-}
-static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
-{
- while (--count >= 0) {
- __raw_writew(*src, addr);
- src++;
- }
-}
-static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
-{
- while (--count >= 0) {
- __raw_writel(*src, addr);
- src++;
- }
-}
void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
{
- IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
+ IO_COND(addr, insb(port,dst,count), readsb(addr, dst, count));
}
void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
{
- IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
+ IO_COND(addr, insw(port,dst,count), readsw(addr, dst, count));
}
void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
{
- IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
+ IO_COND(addr, insl(port,dst,count), readsl(addr, dst, count));
}
EXPORT_SYMBOL(ioread8_rep);
EXPORT_SYMBOL(ioread16_rep);
@@ -173,15 +186,15 @@
void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
{
- IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
+ IO_COND(addr, outsb(port, src, count), writesb(addr, src, count));
}
void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
{
- IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
+ IO_COND(addr, outsw(port, src, count), writesw(addr, src, count));
}
void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
{
- IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
+ IO_COND(addr, outsl(port, src,count), writesl(addr, src, count));
}
EXPORT_SYMBOL(iowrite8_rep);
EXPORT_SYMBOL(iowrite16_rep);
-
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