Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *    $Id: zorro.c,v 1.1.2.1 1998/06/07 23:21:02 geert Exp $

 *

 *    Zorro Bus Services

 *

 *    Copyright (C) 1995-2003 Geert Uytterhoeven

 *

 *    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.

 */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/zorro.h>

#include <linux/bitops.h>

#include <linux/string.h>

#include <asm/setup.h>

#include <asm/amigahw.h>

#include "zorro.h"

    /*

     *  Zorro Expansion Devices

     */

u_int zorro_num_autocon = 0;

struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];

    /*

     *  Single Zorro bus

     */

struct zorro_bus zorro_bus = {\

    .resources = {

        /* Zorro II regions (on Zorro II/III) */

        { .name = "Zorro II exp", .start = 0x00e80000, .end = 0x00efffff },

        { .name = "Zorro II mem", .start = 0x00200000, .end = 0x009fffff },

        /* Zorro III regions (on Zorro III only) */

        { .name = "Zorro III exp", .start = 0xff000000, .end = 0xffffffff },

        { .name = "Zorro III cfg", .start = 0x40000000, .end = 0x7fffffff }

    },

    .name = "Zorro bus"

};

    /*

     *  Find Zorro Devices

     */

struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)

{

    struct zorro_dev *z;

    if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))

        return NULL;

    for (z = from ? from+1 : &zorro_autocon[0];

         z < zorro_autocon+zorro_num_autocon;

         z++)

        if (id == ZORRO_WILDCARD || id == z->id)

            return z;

    return NULL;

}

    /*

     *  Bitmask indicating portions of available Zorro II RAM that are unused

     *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB

     *  (128 chunks, physical 0x00200000-0x009fffff).

     *

     *  If you want to use (= allocate) portions of this RAM, you should clear

     *  the corresponding bits.

     *

     *  Possible uses:

     *      - z2ram device

     *      - SCSI DMA bounce buffers

     *

     *  FIXME: use the normal resource management

     */

DECLARE_BITMAP(zorro_unused_z2ram, 128);

static void __init mark_region(unsigned long start, unsigned long end,

                               int flag)

{

    if (flag)

        start += Z2RAM_CHUNKMASK;

    else

        end += Z2RAM_CHUNKMASK;

    start &= ~Z2RAM_CHUNKMASK;

    end &= ~Z2RAM_CHUNKMASK;

    if (end <= Z2RAM_START || start >= Z2RAM_END)

        return;

    start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;

    end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;

    while (start < end) {

        u32 chunk = start>>Z2RAM_CHUNKSHIFT;

        if (flag)

            set_bit(chunk, zorro_unused_z2ram);

        else

            clear_bit(chunk, zorro_unused_z2ram);

        start += Z2RAM_CHUNKSIZE;

    }

}

static struct resource __init *zorro_find_parent_resource(struct zorro_dev *z)

{

    int i;

    for (i = 0; i < zorro_bus.num_resources; i++)

        if (zorro_resource_start(z) >= zorro_bus.resources[i].start &&

            zorro_resource_end(z) <= zorro_bus.resources[i].end)

                return &zorro_bus.resources[i];

    return &iomem_resource;

}

    /*

     *  Initialization

     */

static int __init zorro_init(void)

{

    struct zorro_dev *z;

    unsigned int i;

    if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))

        return 0;

    pr_info("Zorro: Probing AutoConfig expansion devices: %d device%s\n",

           zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");

    /* Initialize the Zorro bus */

    INIT_LIST_HEAD(&zorro_bus.devices);

    strcpy(zorro_bus.dev.bus_id, "zorro");

    device_register(&zorro_bus.dev);

    /* Request the resources */

    zorro_bus.num_resources = AMIGAHW_PRESENT(ZORRO3) ? 4 : 2;

    for (i = 0; i < zorro_bus.num_resources; i++)

        request_resource(&iomem_resource, &zorro_bus.resources[i]);

    /* Register all devices */

    for (i = 0; i < zorro_num_autocon; i++) {

        z = &zorro_autocon[i];

        z->id = (z->rom.er_Manufacturer<<16) | (z->rom.er_Product<<8);

        if (z->id == ZORRO_PROD_GVP_EPC_BASE) {

            /* GVP quirk */

            unsigned long magic = zorro_resource_start(z)+0x8000;

            z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;

        }

        sprintf(z->name, "Zorro device %08x", z->id);

        zorro_name_device(z);

        z->resource.name = z->name;

        if (request_resource(zorro_find_parent_resource(z), &z->resource))

            printk(KERN_ERR "Zorro: Address space collision on device %s "

                   "[%lx:%lx]\n",

                   z->name, (unsigned long)zorro_resource_start(z),

                   (unsigned long)zorro_resource_end(z));

        sprintf(z->dev.bus_id, "%02x", i);

        z->dev.parent = &zorro_bus.dev;

        z->dev.bus = &zorro_bus_type;

        device_register(&z->dev);

        zorro_create_sysfs_dev_files(z);

    }

    /* Mark all available Zorro II memory */

    zorro_for_each_dev(z) {

        if (z->rom.er_Type & ERTF_MEMLIST)

            mark_region(zorro_resource_start(z), zorro_resource_end(z)+1, 1);

    }

    /* Unmark all used Zorro II memory */

    for (i = 0; i < m68k_num_memory; i++)

        if (m68k_memory[i].addr < 16*1024*1024)

            mark_region(m68k_memory[i].addr,

                        m68k_memory[i].addr+m68k_memory[i].size, 0);

    return 0;

}

subsys_initcall(zorro_init);

EXPORT_SYMBOL(zorro_find_device);

EXPORT_SYMBOL(zorro_unused_z2ram);

MODULE_LICENSE("GPL");