drivers/zorro/zorro.c

   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
  19 #include <asm/setup.h>
  20 #include <asm/amigahw.h>
  21
  22 #include "zorro.h"
  23
  24
  25     /*
  26      *  Zorro Expansion Devices
  27      */
  28
  29 u_int zorro_num_autocon = 0;
  30 struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
  31
  32
  33     /*
  34      *  Single Zorro bus
  35      */
  36
  37 struct zorro_bus zorro_bus = {\
  38     .resources = {
  39         /* Zorro II regions (on Zorro II/III) */
  40         { .name = "Zorro II exp", .start = 0x00e80000, .end = 0x00efffff },
  41         { .name = "Zorro II mem", .start = 0x00200000, .end = 0x009fffff },
  42         /* Zorro III regions (on Zorro III only) */
  43         { .name = "Zorro III exp", .start = 0xff000000, .end = 0xffffffff },
  44         { .name = "Zorro III cfg", .start = 0x40000000, .end = 0x7fffffff }
  45     },
  46     .name = "Zorro bus"
  47 };
  48
  49
  50     /*
  51      *  Find Zorro Devices
  52      */
  53
  54 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
  55 {
  56     struct zorro_dev *z;
  57
  58     if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
  59         return NULL;
  60
  61     for (z = from ? from+1 : &zorro_autocon[0];
  62          z < zorro_autocon+zorro_num_autocon;
  63          z++)
  64         if (id == ZORRO_WILDCARD || id == z->id)
  65             return z;
  66     return NULL;
  67 }
  68
  69
  70     /*
  71      *  Bitmask indicating portions of available Zorro II RAM that are unused
  72      *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB
  73      *  (128 chunks, physical 0x00200000-0x009fffff).
  74      *
  75      *  If you want to use (= allocate) portions of this RAM, you should clear
  76      *  the corresponding bits.
  77      *
  78      *  Possible uses:
  79      *      - z2ram device
  80      *      - SCSI DMA bounce buffers
  81      *
  82      *  FIXME: use the normal resource management
  83      */
  84
  85 DECLARE_BITMAP(zorro_unused_z2ram, 128);
  86
  87
  88 static void __init mark_region(unsigned long start, unsigned long end,
  89                                int flag)
  90 {
  91     if (flag)
  92         start += Z2RAM_CHUNKMASK;
  93     else
  94         end += Z2RAM_CHUNKMASK;
  95     start &= ~Z2RAM_CHUNKMASK;
  96     end &= ~Z2RAM_CHUNKMASK;
  97
  98     if (end <= Z2RAM_START || start >= Z2RAM_END)
  99         return;
 100     start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
 101     end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
 102     while (start < end) {
 103         u32 chunk = start>>Z2RAM_CHUNKSHIFT;
 104         if (flag)
 105             set_bit(chunk, zorro_unused_z2ram);
 106         else
 107             clear_bit(chunk, zorro_unused_z2ram);
 108         start += Z2RAM_CHUNKSIZE;
 109     }
 110 }
 111
 112
 113 static struct resource __init *zorro_find_parent_resource(struct zorro_dev *z)
 114 {
 115     int i;
 116
 117     for (i = 0; i < zorro_bus.num_resources; i++)
 118         if (zorro_resource_start(z) >= zorro_bus.resources[i].start &&
 119             zorro_resource_end(z) <= zorro_bus.resources[i].end)
 120                 return &zorro_bus.resources[i];
 121     return &iomem_resource;
 122 }
 123
 124
 125     /*
 126      *  Initialization
 127      */
 128
 129 static int __init zorro_init(void)
 130 {
 131     struct zorro_dev *z;
 132     unsigned int i;
 133
 134     if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
 135         return 0;
 136
 137     pr_info("Zorro: Probing AutoConfig expansion devices: %d device%s\n",
 138            zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
 139
 140     /* Initialize the Zorro bus */
 141     INIT_LIST_HEAD(&zorro_bus.devices);
 142     strcpy(zorro_bus.dev.bus_id, "zorro");
 143     device_register(&zorro_bus.dev);
 144
 145     /* Request the resources */
 146     zorro_bus.num_resources = AMIGAHW_PRESENT(ZORRO3) ? 4 : 2;
 147     for (i = 0; i < zorro_bus.num_resources; i++)
 148         request_resource(&iomem_resource, &zorro_bus.resources[i]);
 149
 150     /* Register all devices */
 151     for (i = 0; i < zorro_num_autocon; i++) {
 152         z = &zorro_autocon[i];
 153         z->id = (z->rom.er_Manufacturer<<16) | (z->rom.er_Product<<8);
 154         if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
 155             /* GVP quirk */
 156             unsigned long magic = zorro_resource_start(z)+0x8000;
 157             z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
 158         }
 159         sprintf(z->name, "Zorro device %08x", z->id);
 160         zorro_name_device(z);
 161         z->resource.name = z->name;
 162         if (request_resource(zorro_find_parent_resource(z), &z->resource))
 163             printk(KERN_ERR "Zorro: Address space collision on device %s "
 164                    "[%lx:%lx]\n",
 165                    z->name, (unsigned long)zorro_resource_start(z),
 166                    (unsigned long)zorro_resource_end(z));
 167         sprintf(z->dev.bus_id, "%02x", i);
 168         z->dev.parent = &zorro_bus.dev;
 169         z->dev.bus = &zorro_bus_type;
 170         device_register(&z->dev);
 171         zorro_create_sysfs_dev_files(z);
 172     }
 173
 174     /* Mark all available Zorro II memory */
 175     zorro_for_each_dev(z) {
 176         if (z->rom.er_Type & ERTF_MEMLIST)
 177             mark_region(zorro_resource_start(z), zorro_resource_end(z)+1, 1);
 178     }
 179
 180     /* Unmark all used Zorro II memory */
 181     for (i = 0; i < m68k_num_memory; i++)
 182         if (m68k_memory[i].addr < 16*1024*1024)
 183             mark_region(m68k_memory[i].addr,
 184                         m68k_memory[i].addr+m68k_memory[i].size, 0);
 185
 186     return 0;
 187 }
 188
 189 subsys_initcall(zorro_init);
 190
 191 EXPORT_SYMBOL(zorro_find_device);
 192 EXPORT_SYMBOL(zorro_unused_z2ram);
 193
 194 MODULE_LICENSE("GPL");