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/setup.h>
  22 #include <asm/amigahw.h>
  23
  24 #include "zorro.h"
  25
  26
  27     /*
  28      *  Zorro Expansion Devices
  29      */
  30
  31 unsigned int zorro_num_autocon;
  32 struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
  33
  34
  35     /*
  36      *  Zorro bus
  37      */
  38
  39 struct zorro_bus {
  40         struct device dev;
  41 };
  42
  43
  44     /*
  45      *  Find Zorro Devices
  46      */
  47
  48 struct 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 }
  62 EXPORT_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
  80 DECLARE_BITMAP(zorro_unused_z2ram, 128);
  81 EXPORT_SYMBOL(zorro_unused_z2ram);
  82
  83
  84 static 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
 109 static 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
 125 static 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
 207 static struct platform_driver amiga_zorro_driver = {
 208         .driver   = {
 209                 .name   = "amiga-zorro",
 210                 .owner  = THIS_MODULE,
 211         },
 212 };
 213
 214 static int __init amiga_zorro_init(void)
 215 {
 216         return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 217 }
 218
 219 module_init(amiga_zorro_init);
 220
 221 MODULE_LICENSE("GPL");