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 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include <asm/byteorder.h>
  22 #include <asm/setup.h>
  23 #include <asm/amigahw.h>
  24
  25 #include "zorro.h"
  26
  27
  28     /*
  29      *  Zorro Expansion Devices
  30      */
  31
  32 unsigned int zorro_num_autocon;
  33 struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
  34 struct zorro_dev *zorro_autocon;
  35
  36
  37     /*
  38      *  Zorro bus
  39      */
  40
  41 struct zorro_bus {
  42         struct device dev;
  43         struct zorro_dev devices[0];
  44 };
  45
  46
  47     /*
  48      *  Find Zorro Devices
  49      */
  50
  51 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
  52 {
  53         struct zorro_dev *z;
  54
  55         if (!zorro_num_autocon)
  56                 return NULL;
  57
  58         for (z = from ? from+1 : &zorro_autocon[0];
  59              z < zorro_autocon+zorro_num_autocon;
  60              z++)
  61                 if (id == ZORRO_WILDCARD || id == z->id)
  62                         return z;
  63         return NULL;
  64 }
  65 EXPORT_SYMBOL(zorro_find_device);
  66
  67
  68     /*
  69      *  Bitmask indicating portions of available Zorro II RAM that are unused
  70      *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB
  71      *  (128 chunks, physical 0x00200000-0x009fffff).
  72      *
  73      *  If you want to use (= allocate) portions of this RAM, you should clear
  74      *  the corresponding bits.
  75      *
  76      *  Possible uses:
  77      *      - z2ram device
  78      *      - SCSI DMA bounce buffers
  79      *
  80      *  FIXME: use the normal resource management
  81      */
  82
  83 DECLARE_BITMAP(zorro_unused_z2ram, 128);
  84 EXPORT_SYMBOL(zorro_unused_z2ram);
  85
  86
  87 static void __init mark_region(unsigned long start, unsigned long end,
  88                                int flag)
  89 {
  90         if (flag)
  91                 start += Z2RAM_CHUNKMASK;
  92         else
  93                 end += Z2RAM_CHUNKMASK;
  94         start &= ~Z2RAM_CHUNKMASK;
  95         end &= ~Z2RAM_CHUNKMASK;
  96
  97         if (end <= Z2RAM_START || start >= Z2RAM_END)
  98                 return;
  99         start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
 100         end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
 101         while (start < end) {
 102                 u32 chunk = start>>Z2RAM_CHUNKSHIFT;
 103                 if (flag)
 104                         set_bit(chunk, zorro_unused_z2ram);
 105                 else
 106                         clear_bit(chunk, zorro_unused_z2ram);
 107                 start += Z2RAM_CHUNKSIZE;
 108         }
 109 }
 110
 111
 112 static struct resource __init *zorro_find_parent_resource(
 113         struct platform_device *bridge, struct zorro_dev *z)
 114 {
 115         int i;
 116
 117         for (i = 0; i < bridge->num_resources; i++) {
 118                 struct resource *r = &bridge->resource[i];
 119                 if (zorro_resource_start(z) >= r->start &&
 120                     zorro_resource_end(z) <= r->end)
 121                         return r;
 122         }
 123         return &iomem_resource;
 124 }
 125
 126
 127
 128 static int __init amiga_zorro_probe(struct platform_device *pdev)
 129 {
 130         struct zorro_bus *bus;
 131         struct zorro_dev_init *zi;
 132         struct zorro_dev *z;
 133         struct resource *r;
 134         unsigned int i;
 135         int error;
 136
 137         /* Initialize the Zorro bus */
 138         bus = kzalloc(sizeof(*bus) +
 139                       zorro_num_autocon * sizeof(bus->devices[0]),
 140                       GFP_KERNEL);
 141         if (!bus)
 142                 return -ENOMEM;
 143
 144         zorro_autocon = bus->devices;
 145         bus->dev.parent = &pdev->dev;
 146         dev_set_name(&bus->dev, zorro_bus_type.name);
 147         error = device_register(&bus->dev);
 148         if (error) {
 149                 pr_err("Zorro: Error registering zorro_bus\n");
 150                 put_device(&bus->dev);
 151                 kfree(bus);
 152                 return error;
 153         }
 154         platform_set_drvdata(pdev, bus);
 155
 156         pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
 157                  zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
 158
 159         /* First identify all devices ... */
 160         for (i = 0; i < zorro_num_autocon; i++) {
 161                 zi = &zorro_autocon_init[i];
 162                 z = &zorro_autocon[i];
 163
 164                 z->rom = zi->rom;
 165                 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |
 166                         (z->rom.er_Product << 8);
 167                 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
 168                         /* GVP quirk */
 169                         unsigned long magic = zi->boardaddr + 0x8000;
 170                         z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
 171                 }
 172                 z->slotaddr = zi->slotaddr;
 173                 z->slotsize = zi->slotsize;
 174                 sprintf(z->name, "Zorro device %08x", z->id);
 175                 zorro_name_device(z);
 176                 z->resource.start = zi->boardaddr;
 177                 z->resource.end = zi->boardaddr + zi->boardsize - 1;
 178                 z->resource.name = z->name;
 179                 r = zorro_find_parent_resource(pdev, z);
 180                 error = request_resource(r, &z->resource);
 181                 if (error)
 182                         dev_err(&bus->dev,
 183                                 "Address space collision on device %s %pR\n",
 184                                 z->name, &z->resource);
 185                 z->dev.parent = &bus->dev;
 186                 z->dev.bus = &zorro_bus_type;
 187                 z->dev.id = i;
 188         }
 189
 190         /* ... then register them */
 191         for (i = 0; i < zorro_num_autocon; i++) {
 192                 z = &zorro_autocon[i];
 193                 error = device_register(&z->dev);
 194                 if (error) {
 195                         dev_err(&bus->dev, "Error registering device %s\n",
 196                                 z->name);
 197                         put_device(&z->dev);
 198                         continue;
 199                 }
 200         }
 201
 202         /* Mark all available Zorro II memory */
 203         zorro_for_each_dev(z) {
 204                 if (z->rom.er_Type & ERTF_MEMLIST)
 205                         mark_region(zorro_resource_start(z),
 206                                     zorro_resource_end(z)+1, 1);
 207         }
 208
 209         /* Unmark all used Zorro II memory */
 210         for (i = 0; i < m68k_num_memory; i++)
 211                 if (m68k_memory[i].addr < 16*1024*1024)
 212                         mark_region(m68k_memory[i].addr,
 213                                     m68k_memory[i].addr+m68k_memory[i].size,
 214                                     0);
 215
 216         return 0;
 217 }
 218
 219 static struct platform_driver amiga_zorro_driver = {
 220         .driver   = {
 221                 .name   = "amiga-zorro",
 222         },
 223 };
 224
 225 static int __init amiga_zorro_init(void)
 226 {
 227         return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 228 }
 229
 230 module_init(amiga_zorro_init);
 231
 232 MODULE_LICENSE("GPL");