io.c

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/*
 * linux/arch/sh/boards/superh/microdev/io.c
 *
 * Copyright (C) 2003 Sean McGoogan ([email protected])
 * Copyright (C) 2003, 2004 SuperH, Inc.
 * Copyright (C) 2004 Paul Mundt
 *
 * SuperH SH4-202 MicroDev board support.
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 */

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/wait.h>
#include <asm/io.h>
#include <mach/microdev.h>

    /*
     *  we need to have a 'safe' address to re-direct all I/O requests
     *  that we do not explicitly wish to handle. This safe address
     *  must have the following properies:
     *
     *      * writes are ignored (no exception)
     *      * reads are benign (no side-effects)
     *      * accesses of width 1, 2 and 4-bytes are all valid.
     *
     *  The Processor Version Register (PVR) has these properties.
     */
#define PVR 0xff000030  /* Processor Version Register */


#define IO_IDE2_BASE        0x170ul /* I/O base for SMSC FDC37C93xAPM IDE #2 */
#define IO_IDE1_BASE        0x1f0ul /* I/O base for SMSC FDC37C93xAPM IDE #1 */
#define IO_ISP1161_BASE     0x290ul /* I/O port for Philips ISP1161x USB chip */
#define IO_SERIAL2_BASE     0x2f8ul /* I/O base for SMSC FDC37C93xAPM Serial #2 */
#define IO_LAN91C111_BASE   0x300ul /* I/O base for SMSC LAN91C111 Ethernet chip */
#define IO_IDE2_MISC        0x376ul /* I/O misc for SMSC FDC37C93xAPM IDE #2 */
#define IO_SUPERIO_BASE     0x3f0ul /* I/O base for SMSC FDC37C93xAPM SuperIO chip */
#define IO_IDE1_MISC        0x3f6ul /* I/O misc for SMSC FDC37C93xAPM IDE #1 */
#define IO_SERIAL1_BASE     0x3f8ul /* I/O base for SMSC FDC37C93xAPM Serial #1 */

#define IO_ISP1161_EXTENT   0x04ul  /* I/O extent for Philips ISP1161x USB chip */
#define IO_LAN91C111_EXTENT 0x10ul  /* I/O extent for SMSC LAN91C111 Ethernet chip */
#define IO_SUPERIO_EXTENT   0x02ul  /* I/O extent for SMSC FDC37C93xAPM SuperIO chip */
#define IO_IDE_EXTENT       0x08ul  /* I/O extent for IDE Task Register set */
#define IO_SERIAL_EXTENT    0x10ul

#define IO_LAN91C111_PHYS   0xa7500000ul    /* Physical address of SMSC LAN91C111 Ethernet chip */
#define IO_ISP1161_PHYS     0xa7700000ul    /* Physical address of Philips ISP1161x USB chip */
#define IO_SUPERIO_PHYS     0xa7800000ul    /* Physical address of SMSC FDC37C93xAPM SuperIO chip */

/*
 * map I/O ports to memory-mapped addresses
 */
void __iomem *microdev_ioport_map(unsigned long offset, unsigned int len)
{
    unsigned long result;

    if ((offset >= IO_LAN91C111_BASE) &&
        (offset <  IO_LAN91C111_BASE + IO_LAN91C111_EXTENT)) {
            /*
             *  SMSC LAN91C111 Ethernet chip
             */
        result = IO_LAN91C111_PHYS + offset - IO_LAN91C111_BASE;
    } else if ((offset >= IO_SUPERIO_BASE) &&
           (offset <  IO_SUPERIO_BASE + IO_SUPERIO_EXTENT)) {
            /*
             *  SMSC FDC37C93xAPM SuperIO chip
             *
             *  Configuration Registers
             */
        result = IO_SUPERIO_PHYS + (offset << 1);
    } else if (((offset >= IO_IDE1_BASE) &&
            (offset <  IO_IDE1_BASE + IO_IDE_EXTENT)) ||
            (offset == IO_IDE1_MISC)) {
            /*
             *  SMSC FDC37C93xAPM SuperIO chip
             *
             *  IDE #1
             */
            result = IO_SUPERIO_PHYS + (offset << 1);
    } else if (((offset >= IO_IDE2_BASE) &&
            (offset <  IO_IDE2_BASE + IO_IDE_EXTENT)) ||
            (offset == IO_IDE2_MISC)) {
            /*
             *  SMSC FDC37C93xAPM SuperIO chip
             *
             *  IDE #2
             */
            result = IO_SUPERIO_PHYS + (offset << 1);
    } else if ((offset >= IO_SERIAL1_BASE) &&
           (offset <  IO_SERIAL1_BASE + IO_SERIAL_EXTENT)) {
            /*
             *  SMSC FDC37C93xAPM SuperIO chip
             *
             *  Serial #1
             */
        result = IO_SUPERIO_PHYS + (offset << 1);
    } else if ((offset >= IO_SERIAL2_BASE) &&
           (offset <  IO_SERIAL2_BASE + IO_SERIAL_EXTENT)) {
            /*
             *  SMSC FDC37C93xAPM SuperIO chip
             *
             *  Serial #2
             */
        result = IO_SUPERIO_PHYS + (offset << 1);
    } else if ((offset >= IO_ISP1161_BASE) &&
           (offset < IO_ISP1161_BASE + IO_ISP1161_EXTENT)) {
            /*
             *  Philips USB ISP1161x chip
             */
        result = IO_ISP1161_PHYS + offset - IO_ISP1161_BASE;
    } else {
            /*
             *  safe default.
             */
        printk("Warning: unexpected port in %s( offset = 0x%lx )\n",
               __func__, offset);
        result = PVR;
    }

    return (void __iomem *)result;
}