ide.h
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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994-1996 Linus Torvalds & authors
*
* Copied from i386; many of the especially older MIPS or ISA-based platforms
* are basically identical. Using this file probably implies i8259 PIC
* support in a system but the very least interrupt numbers 0 - 15 need to
* be put aside for legacy devices.
*/
#ifndef __ASM_MACH_GENERIC_IDE_H
#define __ASM_MACH_GENERIC_IDE_H
#ifdef __KERNEL__
#include <linux/pci.h>
#include <linux/stddef.h>
#include <asm/processor.h>
/* MIPS port and memory-mapped I/O string operations. */
static inline void __ide_flush_prologue(void)
{
#ifdef CONFIG_SMP
if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
preempt_disable();
#endif
}
static inline void __ide_flush_epilogue(void)
{
#ifdef CONFIG_SMP
if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
preempt_enable();
#endif
}
static inline void __ide_flush_dcache_range(unsigned long addr, unsigned long size)
{
if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc) {
unsigned long end = addr + size;
while (addr < end) {
local_flush_data_cache_page((void *)addr);
addr += PAGE_SIZE;
}
}
}
/*
* insw() and gang might be called with interrupts disabled, so we can't
* send IPIs for flushing due to the potencial of deadlocks, see the comment
* above smp_call_function() in arch/mips/kernel/smp.c. We work around the
* problem by disabling preemption so we know we actually perform the flush
* on the processor that actually has the lines to be flushed which hopefully
* is even better for performance anyway.
*/
static inline void __ide_insw(unsigned long port, void *addr,
unsigned int count)
{
__ide_flush_prologue();
insw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
__ide_flush_epilogue();
}
static inline void __ide_insl(unsigned long port, void *addr, unsigned int count)
{
__ide_flush_prologue();
insl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
__ide_flush_epilogue();
}
static inline void __ide_outsw(unsigned long port, const void *addr,
unsigned long count)
{
__ide_flush_prologue();
outsw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
__ide_flush_epilogue();
}
static inline void __ide_outsl(unsigned long port, const void *addr,
unsigned long count)
{
__ide_flush_prologue();
outsl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
__ide_flush_epilogue();
}
static inline void __ide_mm_insw(void __iomem *port, void *addr, u32 count)
{
__ide_flush_prologue();
readsw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
__ide_flush_epilogue();
}
static inline void __ide_mm_insl(void __iomem *port, void *addr, u32 count)
{
__ide_flush_prologue();
readsl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
__ide_flush_epilogue();
}
static inline void __ide_mm_outsw(void __iomem *port, void *addr, u32 count)
{
__ide_flush_prologue();
writesw(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 2);
__ide_flush_epilogue();
}
static inline void __ide_mm_outsl(void __iomem * port, void *addr, u32 count)
{
__ide_flush_prologue();
writesl(port, addr, count);
__ide_flush_dcache_range((unsigned long)addr, count * 4);
__ide_flush_epilogue();
}
/* ide_insw calls insw, not __ide_insw. Why? */
#undef insw
#undef insl
#undef outsw
#undef outsl
#define insw(port, addr, count) __ide_insw(port, addr, count)
#define insl(port, addr, count) __ide_insl(port, addr, count)
#define outsw(port, addr, count) __ide_outsw(port, addr, count)
#define outsl(port, addr, count) __ide_outsl(port, addr, count)
#endif /* __KERNEL__ */
#endif /* __ASM_MACH_GENERIC_IDE_H */