4cb3cee03d
This patch reworks the way iSeries hooks on PCI IO operations (both MMIO and PIO) and provides a generic way for other platforms to do so (we have need to do that for various other platforms). While reworking the IO ops, I ended up doing some spring cleaning in io.h and eeh.h which I might want to split into 2 or 3 patches (among others, eeh.h had a lot of useless stuff in it). A side effect is that EEH for PIO should work now (it used to pass IO ports down to the eeh address check functions which is bogus). Also, new are MMIO "repeat" ops, which other archs like ARM already had, and that we have too now: readsb, readsw, readsl, writesb, writesw, writesl. In the long run, I might also make EEH use the hooks instead of wrapping at the toplevel, which would make things even cleaner and relegate EEH completely in platforms/iseries, but we have to measure the performance impact there (though it's really only on MMIO reads) Since I also need to hook on ioremap, I shuffled the functions a bit there. I introduced ioremap_flags() to use by drivers who want to pass explicit flags to ioremap (and it can be hooked). The old __ioremap() is still there as a low level and cannot be hooked, thus drivers who use it should migrate unless they know they want the low level version. The patch "arch provides generic iomap missing accessors" (should be number 4 in this series) is a pre-requisite to provide full iomap API support with this patch. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/*
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* I/O string operations
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Copyright (C) 2006 IBM Corporation
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*
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* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras.
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*
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* Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
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* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
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*
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* Rewritten in C by Stephen Rothwell.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/firmware.h>
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#include <asm/bug.h>
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void _insb(const volatile u8 __iomem *port, void *buf, long count)
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{
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u8 *tbuf = buf;
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u8 tmp;
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if (unlikely(count <= 0))
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return;
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asm volatile("sync");
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do {
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tmp = *port;
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asm volatile("eieio");
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*tbuf++ = tmp;
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} while (--count != 0);
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asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
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}
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EXPORT_SYMBOL(_insb);
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void _outsb(volatile u8 __iomem *port, const void *buf, long count)
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{
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const u8 *tbuf = buf;
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if (unlikely(count <= 0))
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return;
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asm volatile("sync");
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do {
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*port = *tbuf++;
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} while (--count != 0);
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asm volatile("sync");
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}
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EXPORT_SYMBOL(_outsb);
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void _insw_ns(const volatile u16 __iomem *port, void *buf, long count)
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{
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u16 *tbuf = buf;
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u16 tmp;
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if (unlikely(count <= 0))
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return;
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asm volatile("sync");
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do {
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tmp = *port;
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asm volatile("eieio");
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*tbuf++ = tmp;
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} while (--count != 0);
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asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
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}
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EXPORT_SYMBOL(_insw_ns);
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void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count)
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{
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const u16 *tbuf = buf;
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if (unlikely(count <= 0))
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return;
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asm volatile("sync");
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do {
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*port = *tbuf++;
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} while (--count != 0);
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asm volatile("sync");
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}
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EXPORT_SYMBOL(_outsw_ns);
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void _insl_ns(const volatile u32 __iomem *port, void *buf, long count)
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{
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u32 *tbuf = buf;
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u32 tmp;
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if (unlikely(count <= 0))
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return;
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asm volatile("sync");
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do {
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tmp = *port;
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asm volatile("eieio");
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*tbuf++ = tmp;
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} while (--count != 0);
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asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
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}
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EXPORT_SYMBOL(_insl_ns);
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void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count)
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{
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const u32 *tbuf = buf;
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if (unlikely(count <= 0))
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return;
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asm volatile("sync");
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do {
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*port = *tbuf++;
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} while (--count != 0);
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asm volatile("sync");
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}
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EXPORT_SYMBOL(_outsl_ns);
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