zorro.c

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/*
 *    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 <linux/platform_device.h>
#include <linux/slab.h>

#include <asm/setup.h>
#include <asm/amigahw.h>

#include "zorro.h"


    /*
     *  Zorro Expansion Devices
     */

unsigned int zorro_num_autocon;
struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];


    /*
     *  Zorro bus
     */

struct zorro_bus {
    struct device dev;
};


    /*
     *  Find Zorro Devices
     */

struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
{
    struct zorro_dev *z;

    if (!zorro_num_autocon)
        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;
}
EXPORT_SYMBOL(zorro_find_device);


    /*
     *  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);
EXPORT_SYMBOL(zorro_unused_z2ram);


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 platform_device *bridge, struct zorro_dev *z)
{
    int i;

    for (i = 0; i < bridge->num_resources; i++) {
        struct resource *r = &bridge->resource[i];
        if (zorro_resource_start(z) >= r->start &&
            zorro_resource_end(z) <= r->end)
            return r;
    }
    return &iomem_resource;
}



static int __init amiga_zorro_probe(struct platform_device *pdev)
{
    struct zorro_bus *bus;
    struct zorro_dev *z;
    struct resource *r;
    unsigned int i;
    int error;

    /* Initialize the Zorro bus */
    bus = kzalloc(sizeof(*bus), GFP_KERNEL);
    if (!bus)
        return -ENOMEM;

    bus->dev.parent = &pdev->dev;
    dev_set_name(&bus->dev, "zorro");
    error = device_register(&bus->dev);
    if (error) {
        pr_err("Zorro: Error registering zorro_bus\n");
        put_device(&bus->dev);
        kfree(bus);
        return error;
    }
    platform_set_drvdata(pdev, bus);

    pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
         zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");

    /* First identify 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;
        r = zorro_find_parent_resource(pdev, z);
        error = request_resource(r, &z->resource);
        if (error)
            dev_err(&bus->dev,
                "Address space collision on device %s %pR\n",
                z->name, &z->resource);
        dev_set_name(&z->dev, "%02x", i);
        z->dev.parent = &bus->dev;
        z->dev.bus = &zorro_bus_type;
    }

    /* ... then register them */
    for (i = 0; i < zorro_num_autocon; i++) {
        z = &zorro_autocon[i];
        error = device_register(&z->dev);
        if (error) {
            dev_err(&bus->dev, "Error registering device %s\n",
                z->name);
            put_device(&z->dev);
            continue;
        }
        error = zorro_create_sysfs_dev_files(z);
        if (error)
            dev_err(&z->dev, "Error creating sysfs files\n");
    }

    /* 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;
}

static struct platform_driver amiga_zorro_driver = {
    .driver   = {
        .name   = "amiga-zorro",
        .owner  = THIS_MODULE,
    },
};

static int __init amiga_zorro_init(void)
{
    return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
}

module_init(amiga_zorro_init);

MODULE_LICENSE("GPL");