/*
 * 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 */