iomv.c

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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) 2000-2003, 2006 Silicon Graphics, Inc. All rights reserved.
 */

#include <linux/module.h>
#include <linux/acpi.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/vga.h>
#include <asm/sn/nodepda.h>
#include <asm/sn/simulator.h>
#include <asm/sn/pda.h>
#include <asm/sn/sn_cpuid.h>
#include <asm/sn/shub_mmr.h>
#include <asm/sn/acpi.h>

#define IS_LEGACY_VGA_IOPORT(p) \
    (((p) >= 0x3b0 && (p) <= 0x3bb) || ((p) >= 0x3c0 && (p) <= 0x3df))

void *sn_io_addr(unsigned long port)
{
    if (!IS_RUNNING_ON_SIMULATOR()) {
        if (IS_LEGACY_VGA_IOPORT(port))
            return (__ia64_mk_io_addr(port));
        /* On sn2, legacy I/O ports don't point at anything */
        if (port < (64 * 1024))
            return NULL;
        if (SN_ACPI_BASE_SUPPORT())
            return (__ia64_mk_io_addr(port));
        else
            return ((void *)(port | __IA64_UNCACHED_OFFSET));
    } else {
        /* but the simulator uses them... */
        unsigned long addr;

        /*
         * word align port, but need more than 10 bits
         * for accessing registers in bedrock local block
         * (so we don't do port&0xfff)
         */
        addr = (is_shub2() ? 0xc00000028c000000UL : 0xc0000087cc000000UL) | ((port >> 2) << 12);
        if ((port >= 0x1f0 && port <= 0x1f7) || port == 0x3f6 || port == 0x3f7)
            addr |= port;
        return (void *)addr;
    }
}

EXPORT_SYMBOL(sn_io_addr);

void __sn_mmiowb(void)
{
    volatile unsigned long *adr = pda->pio_write_status_addr;
    unsigned long val = pda->pio_write_status_val;

    while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
        cpu_relax();
}

EXPORT_SYMBOL(__sn_mmiowb);