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[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>
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Stephen Rothwell
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Sep 20, 2006
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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); |
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