25000c2c8a
Matthew Wilcox asked that this got a comment explaining why it is done so here it is. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
/*
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* linux/include/asm-i386/ide.h
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*
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* Copyright (C) 1994-1996 Linus Torvalds & authors
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*/
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/*
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* This file contains the i386 architecture specific IDE code.
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*/
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#ifndef __ASMi386_IDE_H
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#define __ASMi386_IDE_H
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#ifdef __KERNEL__
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#include <linux/config.h>
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#ifndef MAX_HWIFS
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# ifdef CONFIG_BLK_DEV_IDEPCI
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#define MAX_HWIFS 10
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# else
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#define MAX_HWIFS 6
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# endif
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#endif
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#define IDE_ARCH_OBSOLETE_DEFAULTS
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static __inline__ int ide_default_irq(unsigned long base)
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{
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switch (base) {
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case 0x1f0: return 14;
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case 0x170: return 15;
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case 0x1e8: return 11;
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case 0x168: return 10;
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case 0x1e0: return 8;
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case 0x160: return 12;
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default:
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return 0;
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}
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}
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static __inline__ unsigned long ide_default_io_base(int index)
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{
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/*
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* If PCI is present then it is not safe to poke around
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* the other legacy IDE ports. Only 0x1f0 and 0x170 are
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* defined compatibility mode ports for PCI. A user can
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* override this using ide= but we must default safe.
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*/
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if (pci_find_device(PCI_ANY_ID, PCI_ANY_ID, NULL) == NULL) {
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switch(index) {
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case 2: return 0x1e8;
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case 3: return 0x168;
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case 4: return 0x1e0;
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case 5: return 0x160;
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}
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}
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switch (index) {
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case 0: return 0x1f0;
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case 1: return 0x170;
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default:
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return 0;
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}
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}
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#define IDE_ARCH_OBSOLETE_INIT
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#define ide_default_io_ctl(base) ((base) + 0x206) /* obsolete */
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#ifdef CONFIG_BLK_DEV_IDEPCI
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#define ide_init_default_irq(base) (0)
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#else
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#define ide_init_default_irq(base) ide_default_irq(base)
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#endif
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#include <asm-generic/ide_iops.h>
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#endif /* __KERNEL__ */
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#endif /* __ASMi386_IDE_H */
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