ide.h

来自「linux 内核源代码」· C头文件 代码 · 共 226 行

/*
 * 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>

#ifndef MAX_HWIFS
# ifdef CONFIG_BLK_DEV_IDEPCI
#define MAX_HWIFS	10
# else
#define MAX_HWIFS	6
# endif
#endif

#define IDE_ARCH_OBSOLETE_DEFAULTS

static __inline__ int ide_probe_legacy(void)
{
#ifdef CONFIG_PCI
	struct pci_dev *dev;
	/*
	 * This can be called on the ide_setup() path, super-early in
	 * boot.  But the down_read() will enable local interrupts,
	 * which can cause some machines to crash.  So here we detect
	 * and flag that situation and bail out early.
	 */
	if (no_pci_devices())
		return 0;
	dev = pci_get_class(PCI_CLASS_BRIDGE_EISA << 8, NULL);
	if (dev)
		goto found;
	dev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
	if (dev)
		goto found;
	return 0;
found:
	pci_dev_put(dev);
	return 1;
#elif defined(CONFIG_EISA) || defined(CONFIG_ISA)
	return 1;
#else
	return 0;
#endif
}

static __inline__ int ide_default_irq(unsigned long base)
{
	switch (base) {
		case 0x1f0: return 14;
		case 0x170: return 15;
		case 0x1e8: return 11;
		case 0x168: return 10;
		case 0x1e0: return 8;
		case 0x160: return 12;
		default:
			return 0;
	}
}

static __inline__ unsigned long ide_default_io_base(int index)
{
	if (!ide_probe_legacy())
		return 0;
	/*
	 *      If PCI is present then it is not safe to poke around
	 *      the other legacy IDE ports. Only 0x1f0 and 0x170 are
	 *      defined compatibility mode ports for PCI. A user can
	 *      override this using ide= but we must default safe.
	 */
	if (no_pci_devices()) {
		switch (index) {
		case 2: return 0x1e8;
		case 3: return 0x168;
		case 4: return 0x1e0;
		case 5: return 0x160;
		}
	}
	switch (index) {
	case 0: return 0x1f0;
	case 1: return 0x170;
	default:
		return 0;
	}
}

#define ide_default_io_ctl(base)	((base) + 0x206) /* obsolete */

#ifdef CONFIG_BLK_DEV_IDEPCI
#define ide_init_default_irq(base)	(0)
#else
#define ide_init_default_irq(base)	ide_default_irq(base)
#endif

/* MIPS port and memory-mapped I/O string operations.  */
static inline void __ide_flush_prologue(void)
{
#ifdef CONFIG_SMP
	if (cpu_has_dc_aliases)
		preempt_disable();
#endif
}

static inline void __ide_flush_epilogue(void)
{
#ifdef CONFIG_SMP
	if (cpu_has_dc_aliases)
		preempt_enable();
#endif
}

static inline void __ide_flush_dcache_range(unsigned long addr, unsigned long size)
{
	if (cpu_has_dc_aliases) {
		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 */