linux/drivers/zorro/zorro.c
<<
>>
Prefs
   1/*
   2 *    Zorro Bus Services
   3 *
   4 *    Copyright (C) 1995-2003 Geert Uytterhoeven
   5 *
   6 *    This file is subject to the terms and conditions of the GNU General Public
   7 *    License.  See the file COPYING in the main directory of this archive
   8 *    for more details.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/types.h>
  13#include <linux/kernel.h>
  14#include <linux/init.h>
  15#include <linux/zorro.h>
  16#include <linux/bitops.h>
  17#include <linux/string.h>
  18#include <linux/platform_device.h>
  19#include <linux/slab.h>
  20
  21#include <asm/setup.h>
  22#include <asm/amigahw.h>
  23
  24#include "zorro.h"
  25
  26
  27    /*
  28     *  Zorro Expansion Devices
  29     */
  30
  31unsigned int zorro_num_autocon;
  32struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
  33
  34
  35    /*
  36     *  Zorro bus
  37     */
  38
  39struct zorro_bus {
  40        struct device dev;
  41};
  42
  43
  44    /*
  45     *  Find Zorro Devices
  46     */
  47
  48struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
  49{
  50        struct zorro_dev *z;
  51
  52        if (!zorro_num_autocon)
  53                return NULL;
  54
  55        for (z = from ? from+1 : &zorro_autocon[0];
  56             z < zorro_autocon+zorro_num_autocon;
  57             z++)
  58                if (id == ZORRO_WILDCARD || id == z->id)
  59                        return z;
  60        return NULL;
  61}
  62EXPORT_SYMBOL(zorro_find_device);
  63
  64
  65    /*
  66     *  Bitmask indicating portions of available Zorro II RAM that are unused
  67     *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB
  68     *  (128 chunks, physical 0x00200000-0x009fffff).
  69     *
  70     *  If you want to use (= allocate) portions of this RAM, you should clear
  71     *  the corresponding bits.
  72     *
  73     *  Possible uses:
  74     *      - z2ram device
  75     *      - SCSI DMA bounce buffers
  76     *
  77     *  FIXME: use the normal resource management
  78     */
  79
  80DECLARE_BITMAP(zorro_unused_z2ram, 128);
  81EXPORT_SYMBOL(zorro_unused_z2ram);
  82
  83
  84static void __init mark_region(unsigned long start, unsigned long end,
  85                               int flag)
  86{
  87        if (flag)
  88                start += Z2RAM_CHUNKMASK;
  89        else
  90                end += Z2RAM_CHUNKMASK;
  91        start &= ~Z2RAM_CHUNKMASK;
  92        end &= ~Z2RAM_CHUNKMASK;
  93
  94        if (end <= Z2RAM_START || start >= Z2RAM_END)
  95                return;
  96        start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
  97        end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
  98        while (start < end) {
  99                u32 chunk = start>>Z2RAM_CHUNKSHIFT;
 100                if (flag)
 101                        set_bit(chunk, zorro_unused_z2ram);
 102                else
 103                        clear_bit(chunk, zorro_unused_z2ram);
 104                start += Z2RAM_CHUNKSIZE;
 105        }
 106}
 107
 108
 109static struct resource __init *zorro_find_parent_resource(
 110        struct platform_device *bridge, struct zorro_dev *z)
 111{
 112        int i;
 113
 114        for (i = 0; i < bridge->num_resources; i++) {
 115                struct resource *r = &bridge->resource[i];
 116                if (zorro_resource_start(z) >= r->start &&
 117                    zorro_resource_end(z) <= r->end)
 118                        return r;
 119        }
 120        return &iomem_resource;
 121}
 122
 123
 124
 125static int __init amiga_zorro_probe(struct platform_device *pdev)
 126{
 127        struct zorro_bus *bus;
 128        struct zorro_dev *z;
 129        struct resource *r;
 130        unsigned int i;
 131        int error;
 132
 133        /* Initialize the Zorro bus */
 134        bus = kzalloc(sizeof(*bus), GFP_KERNEL);
 135        if (!bus)
 136                return -ENOMEM;
 137
 138        bus->dev.parent = &pdev->dev;
 139        dev_set_name(&bus->dev, "zorro");
 140        error = device_register(&bus->dev);
 141        if (error) {
 142                pr_err("Zorro: Error registering zorro_bus\n");
 143                put_device(&bus->dev);
 144                kfree(bus);
 145                return error;
 146        }
 147        platform_set_drvdata(pdev, bus);
 148
 149        pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
 150                 zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
 151
 152        /* First identify all devices ... */
 153        for (i = 0; i < zorro_num_autocon; i++) {
 154                z = &zorro_autocon[i];
 155                z->id = (z->rom.er_Manufacturer<<16) | (z->rom.er_Product<<8);
 156                if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
 157                        /* GVP quirk */
 158                        unsigned long magic = zorro_resource_start(z)+0x8000;
 159                        z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
 160                }
 161                sprintf(z->name, "Zorro device %08x", z->id);
 162                zorro_name_device(z);
 163                z->resource.name = z->name;
 164                r = zorro_find_parent_resource(pdev, z);
 165                error = request_resource(r, &z->resource);
 166                if (error)
 167                        dev_err(&bus->dev,
 168                                "Address space collision on device %s %pR\n",
 169                                z->name, &z->resource);
 170                dev_set_name(&z->dev, "%02x", i);
 171                z->dev.parent = &bus->dev;
 172                z->dev.bus = &zorro_bus_type;
 173        }
 174
 175        /* ... then register them */
 176        for (i = 0; i < zorro_num_autocon; i++) {
 177                z = &zorro_autocon[i];
 178                error = device_register(&z->dev);
 179                if (error) {
 180                        dev_err(&bus->dev, "Error registering device %s\n",
 181                                z->name);
 182                        put_device(&z->dev);
 183                        continue;
 184                }
 185                error = zorro_create_sysfs_dev_files(z);
 186                if (error)
 187                        dev_err(&z->dev, "Error creating sysfs files\n");
 188        }
 189
 190        /* Mark all available Zorro II memory */
 191        zorro_for_each_dev(z) {
 192                if (z->rom.er_Type & ERTF_MEMLIST)
 193                        mark_region(zorro_resource_start(z),
 194                                    zorro_resource_end(z)+1, 1);
 195        }
 196
 197        /* Unmark all used Zorro II memory */
 198        for (i = 0; i < m68k_num_memory; i++)
 199                if (m68k_memory[i].addr < 16*1024*1024)
 200                        mark_region(m68k_memory[i].addr,
 201                                    m68k_memory[i].addr+m68k_memory[i].size,
 202                                    0);
 203
 204        return 0;
 205}
 206
 207static struct platform_driver amiga_zorro_driver = {
 208        .driver   = {
 209                .name   = "amiga-zorro",
 210                .owner  = THIS_MODULE,
 211        },
 212};
 213
 214static int __init amiga_zorro_init(void)
 215{
 216        return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 217}
 218
 219module_init(amiga_zorro_init);
 220
 221MODULE_LICENSE("GPL");
 222
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.