drivers/zorro/zorro.c

   1 /*
   2  *    $Id: zorro.c,v 1.1.2.1 1998/06/07 23:21:02 geert Exp $
   3  *
   4  *    Zorro Bus Services
   5  *
   6  *    Copyright (C) 1995-2003 Geert Uytterhoeven
   7  *
   8  *    This file is subject to the terms and conditions of the GNU General Public
   9  *    License.  See the file COPYING in the main directory of this archive
  10  *    for more details.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/zorro.h>
  18 #include <linux/bitops.h>
  19 #include <linux/string.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
  31 u_int zorro_num_autocon = 0;
  32 struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
  33
  34
  35     /*
  36      *  Single Zorro bus
  37      */
  38
  39 struct zorro_bus zorro_bus = {\
  40     .resources = {
  41         /* Zorro II regions (on Zorro II/III) */
  42         { .name = "Zorro II exp", .start = 0x00e80000, .end = 0x00efffff },
  43         { .name = "Zorro II mem", .start = 0x00200000, .end = 0x009fffff },
  44         /* Zorro III regions (on Zorro III only) */
  45         { .name = "Zorro III exp", .start = 0xff000000, .end = 0xffffffff },
  46         { .name = "Zorro III cfg", .start = 0x40000000, .end = 0x7fffffff }
  47     },
  48     .name = "Zorro bus"
  49 };
  50
  51
  52     /*
  53      *  Find Zorro Devices
  54      */
  55
  56 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
  57 {
  58     struct zorro_dev *z;
  59
  60     if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
  61         return NULL;
  62
  63     for (z = from ? from+1 : &zorro_autocon[0];
  64          z < zorro_autocon+zorro_num_autocon;
  65          z++)
  66         if (id == ZORRO_WILDCARD || id == z->id)
  67             return z;
  68     return NULL;
  69 }
  70
  71
  72     /*
  73      *  Bitmask indicating portions of available Zorro II RAM that are unused
  74      *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB
  75      *  (128 chunks, physical 0x00200000-0x009fffff).
  76      *
  77      *  If you want to use (= allocate) portions of this RAM, you should clear
  78      *  the corresponding bits.
  79      *
  80      *  Possible uses:
  81      *      - z2ram device
  82      *      - SCSI DMA bounce buffers
  83      *
  84      *  FIXME: use the normal resource management
  85      */
  86
  87 DECLARE_BITMAP(zorro_unused_z2ram, 128);
  88
  89
  90 static void __init mark_region(unsigned long start, unsigned long end,
  91                                int flag)
  92 {
  93     if (flag)
  94         start += Z2RAM_CHUNKMASK;
  95     else
  96         end += Z2RAM_CHUNKMASK;
  97     start &= ~Z2RAM_CHUNKMASK;
  98     end &= ~Z2RAM_CHUNKMASK;
  99
 100     if (end <= Z2RAM_START || start >= Z2RAM_END)
 101         return;
 102     start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
 103     end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
 104     while (start < end) {
 105         u32 chunk = start>>Z2RAM_CHUNKSHIFT;
 106         if (flag)
 107             set_bit(chunk, zorro_unused_z2ram);
 108         else
 109             clear_bit(chunk, zorro_unused_z2ram);
 110         start += Z2RAM_CHUNKSIZE;
 111     }
 112 }
 113
 114
 115 static struct resource __init *zorro_find_parent_resource(struct zorro_dev *z)
 116 {
 117     int i;
 118
 119     for (i = 0; i < zorro_bus.num_resources; i++)
 120         if (zorro_resource_start(z) >= zorro_bus.resources[i].start &&
 121             zorro_resource_end(z) <= zorro_bus.resources[i].end)
 122                 return &zorro_bus.resources[i];
 123     return &iomem_resource;
 124 }
 125
 126
 127     /*
 128      *  Initialization
 129      */
 130
 131 static int __init zorro_init(void)
 132 {
 133     struct zorro_dev *z;
 134     unsigned int i;
 135
 136     if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
 137         return 0;
 138
 139     pr_info("Zorro: Probing AutoConfig expansion devices: %d device%s\n",
 140            zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
 141
 142     /* Initialize the Zorro bus */
 143     INIT_LIST_HEAD(&zorro_bus.devices);
 144     strcpy(zorro_bus.dev.bus_id, "zorro");
 145     device_register(&zorro_bus.dev);
 146
 147     /* Request the resources */
 148     zorro_bus.num_resources = AMIGAHW_PRESENT(ZORRO3) ? 4 : 2;
 149     for (i = 0; i < zorro_bus.num_resources; i++)
 150         request_resource(&iomem_resource, &zorro_bus.resources[i]);
 151
 152     /* Register 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         if (request_resource(zorro_find_parent_resource(z), &z->resource))
 165             printk(KERN_ERR "Zorro: Address space collision on device %s "
 166                    "[%lx:%lx]\n",
 167                    z->name, (unsigned long)zorro_resource_start(z),
 168                    (unsigned long)zorro_resource_end(z));
 169         sprintf(z->dev.bus_id, "%02x", i);
 170         z->dev.parent = &zorro_bus.dev;
 171         z->dev.bus = &zorro_bus_type;
 172         device_register(&z->dev);
 173         zorro_create_sysfs_dev_files(z);
 174     }
 175
 176     /* Mark all available Zorro II memory */
 177     zorro_for_each_dev(z) {
 178         if (z->rom.er_Type & ERTF_MEMLIST)
 179             mark_region(zorro_resource_start(z), zorro_resource_end(z)+1, 1);
 180     }
 181
 182     /* Unmark all used Zorro II memory */
 183     for (i = 0; i < m68k_num_memory; i++)
 184         if (m68k_memory[i].addr < 16*1024*1024)
 185             mark_region(m68k_memory[i].addr,
 186                         m68k_memory[i].addr+m68k_memory[i].size, 0);
 187
 188     return 0;
 189 }
 190
 191 subsys_initcall(zorro_init);
 192
 193 EXPORT_SYMBOL(zorro_find_device);
 194 EXPORT_SYMBOL(zorro_unused_z2ram);
 195
 196 MODULE_LICENSE("GPL");