[POWERPC] convert string i/o operations to C

This produces essentially the same code and will make the iSeries i/o
consolidation easier.

The count parameter is changed to long since that will produce the same
(better) code on 32 and 64 bit builds.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 8b3f4fa..8b133af 100644 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -51,7 +51,7 @@ extra-$(CONFIG_8xx)           := head_8xx.o
 extra-y                                += vmlinux.lds
 
 obj-y                          += time.o prom.o traps.o setup-common.o \
-                                  udbg.o misc.o
+                                  udbg.o misc.o io.o
 obj-$(CONFIG_PPC32)            += entry_32.o setup_32.o misc_32.o
 obj-$(CONFIG_PPC64)            += misc_64.o dma_64.o iommu.o
 obj-$(CONFIG_PPC_MULTIPLATFORM)        += prom_init.o

diff --git a/arch/powerpc/kernel/io.c b/arch/powerpc/kernel/io.c
new file mode 100644 (file)
index 0000000..80a3209
--- /dev/null
+++ b/arch/powerpc/kernel/io.c
@@ -0,0 +1,117 @@
+/*
+ * I/O string operations
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *    Copyright (C) 2006 IBM Corporation
+ *
+ * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
+ * and Paul Mackerras.
+ *
+ * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
+ * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
+ *
+ * Rewritten in C by Stephen Rothwell.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+
+void _insb(volatile u8 __iomem *port, void *buf, long count)
+{
+       u8 *tbuf = buf;
+       u8 tmp;
+
+       if (unlikely(count <= 0))
+               return;
+       asm volatile("sync");
+       do {
+               tmp = *port;
+               asm volatile("eieio");
+               *tbuf++ = tmp;
+       } while (--count != 0);
+       asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
+}
+EXPORT_SYMBOL(_insb);
+
+void _outsb(volatile u8 __iomem *port, const void *buf, long count)
+{
+       const u8 *tbuf = buf;
+
+       if (unlikely(count <= 0))
+               return;
+       asm volatile("sync");
+       do {
+               *port = *tbuf++;
+       } while (--count != 0);
+       asm volatile("sync");
+}
+EXPORT_SYMBOL(_outsb);
+
+void _insw_ns(volatile u16 __iomem *port, void *buf, long count)
+{
+       u16 *tbuf = buf;
+       u16 tmp;
+
+       if (unlikely(count <= 0))
+               return;
+       asm volatile("sync");
+       do {
+               tmp = *port;
+               asm volatile("eieio");
+               *tbuf++ = tmp;
+       } while (--count != 0);
+       asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
+}
+EXPORT_SYMBOL(_insw_ns);
+
+void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count)
+{
+       const u16 *tbuf = buf;
+
+       if (unlikely(count <= 0))
+               return;
+       asm volatile("sync");
+       do {
+               *port = *tbuf++;
+       } while (--count != 0);
+       asm volatile("sync");
+}
+EXPORT_SYMBOL(_outsw_ns);
+
+void _insl_ns(volatile u32 __iomem *port, void *buf, long count)
+{
+       u32 *tbuf = buf;
+       u32 tmp;
+
+       if (unlikely(count <= 0))
+               return;
+       asm volatile("sync");
+       do {
+               tmp = *port;
+               asm volatile("eieio");
+               *tbuf++ = tmp;
+       } while (--count != 0);
+       asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
+}
+EXPORT_SYMBOL(_insl_ns);
+
+void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count)
+{
+       const u32 *tbuf = buf;
+
+       if (unlikely(count <= 0))
+               return;
+       asm volatile("sync");
+       do {
+               *port = *tbuf++;
+       } while (--count != 0);
+       asm volatile("sync");
+}
+EXPORT_SYMBOL(_outsl_ns);

diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index 6feb391..330c9dc 100644 (file)
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -43,98 +43,3 @@ _GLOBAL(add_reloc_offset)
        add     r3,r3,r5
        mtlr    r0
        blr
-
-/*
- * I/O string operations
- *
- * insb(port, buf, len)
- * outsb(port, buf, len)
- * insw(port, buf, len)
- * outsw(port, buf, len)
- * insl(port, buf, len)
- * outsl(port, buf, len)
- * insw_ns(port, buf, len)
- * outsw_ns(port, buf, len)
- * insl_ns(port, buf, len)
- * outsl_ns(port, buf, len)
- *
- * The *_ns versions don't do byte-swapping.
- */
-_GLOBAL(_insb)
-       sync
-       cmpwi   0,r5,0
-       mtctr   r5
-       subi    r4,r4,1
-       blelr-
-00:    lbz     r5,0(r3)
-       eieio
-       stbu    r5,1(r4)
-       bdnz    00b
-       twi     0,r5,0
-       isync
-       blr
-
-_GLOBAL(_outsb)
-       cmpwi   0,r5,0
-       mtctr   r5
-       subi    r4,r4,1
-       blelr-
-       sync
-00:    lbzu    r5,1(r4)
-       stb     r5,0(r3)
-       bdnz    00b
-       sync
-       blr
-
-_GLOBAL(_insw_ns)
-       sync
-       cmpwi   0,r5,0
-       mtctr   r5
-       subi    r4,r4,2
-       blelr-
-00:    lhz     r5,0(r3)
-       eieio
-       sthu    r5,2(r4)
-       bdnz    00b
-       twi     0,r5,0
-       isync
-       blr
-
-_GLOBAL(_outsw_ns)
-       cmpwi   0,r5,0
-       mtctr   r5
-       subi    r4,r4,2
-       blelr-
-       sync
-00:    lhzu    r5,2(r4)
-       sth     r5,0(r3)
-       bdnz    00b
-       sync
-       blr
-
-_GLOBAL(_insl_ns)
-       sync
-       cmpwi   0,r5,0
-       mtctr   r5
-       subi    r4,r4,4
-       blelr-
-00:    lwz     r5,0(r3)
-       eieio
-       stwu    r5,4(r4)
-       bdnz    00b
-       twi     0,r5,0
-       isync
-       blr
-
-_GLOBAL(_outsl_ns)
-       cmpwi   0,r5,0
-       mtctr   r5
-       subi    r4,r4,4
-       blelr-
-       sync
-00:    lwzu    r5,4(r4)
-       stw     r5,0(r3)
-       bdnz    00b
-       sync
-       blr
-

diff --git a/arch/powerpc/kernel/ppc_ksyms.c b/arch/powerpc/kernel/ppc_ksyms.c
index 75429e5..807193a 100644 (file)
--- a/arch/powerpc/kernel/ppc_ksyms.c
+++ b/arch/powerpc/kernel/ppc_ksyms.c
@@ -95,13 +95,6 @@ EXPORT_SYMBOL(__strnlen_user);
 EXPORT_SYMBOL(copy_4K_page);
 #endif
 
-EXPORT_SYMBOL(_insb);
-EXPORT_SYMBOL(_outsb);
-EXPORT_SYMBOL(_insw_ns);
-EXPORT_SYMBOL(_outsw_ns);
-EXPORT_SYMBOL(_insl_ns);
-EXPORT_SYMBOL(_outsl_ns);
-
 #if defined(CONFIG_PPC32) && (defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE))
 EXPORT_SYMBOL(ppc_ide_md);
 #endif

diff --git a/include/asm-powerpc/io.h b/include/asm-powerpc/io.h
index 51a5987..57e7d14 100644 (file)
--- a/include/asm-powerpc/io.h
+++ b/include/asm-powerpc/io.h
@@ -143,12 +143,12 @@ static inline void __raw_writeq(unsigned long v, volatile void __iomem *addr)
 #define readl_relaxed(addr) readl(addr)
 #define readq_relaxed(addr) readq(addr)
 
-extern void _insb(volatile u8 __iomem *port, void *buf, int ns);
-extern void _outsb(volatile u8 __iomem *port, const void *buf, int ns);
-extern void _insw_ns(volatile u16 __iomem *port, void *buf, int ns);
-extern void _outsw_ns(volatile u16 __iomem *port, const void *buf, int ns);
-extern void _insl_ns(volatile u32 __iomem *port, void *buf, int nl);
-extern void _outsl_ns(volatile u32 __iomem *port, const void *buf, int nl);
+extern void _insb(volatile u8 __iomem *port, void *buf, long count);
+extern void _outsb(volatile u8 __iomem *port, const void *buf, long count);
+extern void _insw_ns(volatile u16 __iomem *port, void *buf, long count);
+extern void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count);
+extern void _insl_ns(volatile u32 __iomem *port, void *buf, long count);
+extern void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count);
 
 static inline void mmiowb(void)
 {

diff --git a/include/asm-ppc/io.h b/include/asm-ppc/io.h
index 9fac420..3d9a9e6 100644 (file)
--- a/include/asm-ppc/io.h
+++ b/include/asm-ppc/io.h
@@ -327,12 +327,12 @@ __do_out_asm(outl, "stwbrx")
 #define inl_p(port)            inl((port))
 #define outl_p(val, port)      outl((val), (port))
 
-extern void _insb(volatile u8 __iomem *port, void *buf, int ns);
-extern void _outsb(volatile u8 __iomem *port, const void *buf, int ns);
-extern void _insw_ns(volatile u16 __iomem *port, void *buf, int ns);
-extern void _outsw_ns(volatile u16 __iomem *port, const void *buf, int ns);
-extern void _insl_ns(volatile u32 __iomem *port, void *buf, int nl);
-extern void _outsl_ns(volatile u32 __iomem *port, const void *buf, int nl);
+extern void _insb(volatile u8 __iomem *port, void *buf, long count);
+extern void _outsb(volatile u8 __iomem *port, const void *buf, long count);
+extern void _insw_ns(volatile u16 __iomem *port, void *buf, long count);
+extern void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count);
+extern void _insl_ns(volatile u32 __iomem *port, void *buf, long count);
+extern void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count);
 
 
 #define IO_SPACE_LIMIT ~0