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/dma-mapping.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/byteorder.h>
  23 #include <asm/setup.h>
  24 #include <asm/amigahw.h>
  25
  26 #include "zorro.h"
  27
  28
  29     /*
  30      *  Zorro Expansion Devices
  31      */
  32
  33 unsigned int zorro_num_autocon;
  34 struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
  35 struct zorro_dev *zorro_autocon;
  36
  37
  38     /*
  39      *  Zorro bus
  40      */
  41
  42 struct zorro_bus {
  43         struct device dev;
  44         struct zorro_dev devices[0];
  45 };
  46
  47
  48     /*
  49      *  Find Zorro Devices
  50      */
  51
  52 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
  53 {
  54         struct zorro_dev *z;
  55
  56         if (!zorro_num_autocon)
  57                 return NULL;
  58
  59         for (z = from ? from+1 : &zorro_autocon[0];
  60              z < zorro_autocon+zorro_num_autocon;
  61              z++)
  62                 if (id == ZORRO_WILDCARD || id == z->id)
  63                         return z;
  64         return NULL;
  65 }
  66 EXPORT_SYMBOL(zorro_find_device);
  67
  68
  69     /*
  70      *  Bitmask indicating portions of available Zorro II RAM that are unused
  71      *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB
  72      *  (128 chunks, physical 0x00200000-0x009fffff).
  73      *
  74      *  If you want to use (= allocate) portions of this RAM, you should clear
  75      *  the corresponding bits.
  76      *
  77      *  Possible uses:
  78      *      - z2ram device
  79      *      - SCSI DMA bounce buffers
  80      *
  81      *  FIXME: use the normal resource management
  82      */
  83
  84 DECLARE_BITMAP(zorro_unused_z2ram, 128);
  85 EXPORT_SYMBOL(zorro_unused_z2ram);
  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(
 114         struct platform_device *bridge, struct zorro_dev *z)
 115 {
 116         int i;
 117
 118         for (i = 0; i < bridge->num_resources; i++) {
 119                 struct resource *r = &bridge->resource[i];
 120                 if (zorro_resource_start(z) >= r->start &&
 121                     zorro_resource_end(z) <= r->end)
 122                         return r;
 123         }
 124         return &iomem_resource;
 125 }
 126
 127
 128
 129 static int __init amiga_zorro_probe(struct platform_device *pdev)
 130 {
 131         struct zorro_bus *bus;
 132         struct zorro_dev_init *zi;
 133         struct zorro_dev *z;
 134         struct resource *r;
 135         unsigned int i;
 136         int error;
 137
 138         /* Initialize the Zorro bus */
 139         bus = kzalloc(sizeof(*bus) +
 140                       zorro_num_autocon * sizeof(bus->devices[0]),
 141                       GFP_KERNEL);
 142         if (!bus)
 143                 return -ENOMEM;
 144
 145         zorro_autocon = bus->devices;
 146         bus->dev.parent = &pdev->dev;
 147         dev_set_name(&bus->dev, zorro_bus_type.name);
 148         error = device_register(&bus->dev);
 149         if (error) {
 150                 pr_err("Zorro: Error registering zorro_bus\n");
 151                 put_device(&bus->dev);
 152                 kfree(bus);
 153                 return error;
 154         }
 155         platform_set_drvdata(pdev, bus);
 156
 157         pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
 158                  zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
 159
 160         /* First identify all devices ... */
 161         for (i = 0; i < zorro_num_autocon; i++) {
 162                 zi = &zorro_autocon_init[i];
 163                 z = &zorro_autocon[i];
 164
 165                 z->rom = zi->rom;
 166                 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |
 167                         (z->rom.er_Product << 8);
 168                 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
 169                         /* GVP quirk */
 170                         unsigned long magic = zi->boardaddr + 0x8000;
 171                         z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
 172                 }
 173                 z->slotaddr = zi->slotaddr;
 174                 z->slotsize = zi->slotsize;
 175                 sprintf(z->name, "Zorro device %08x", z->id);
 176                 zorro_name_device(z);
 177                 z->resource.start = zi->boardaddr;
 178                 z->resource.end = zi->boardaddr + zi->boardsize - 1;
 179                 z->resource.name = z->name;
 180                 r = zorro_find_parent_resource(pdev, z);
 181                 error = request_resource(r, &z->resource);
 182                 if (error)
 183                         dev_err(&bus->dev,
 184                                 "Address space collision on device %s %pR\n",
 185                                 z->name, &z->resource);
 186                 z->dev.parent = &bus->dev;
 187                 z->dev.bus = &zorro_bus_type;
 188                 z->dev.id = i;
 189                 switch (z->rom.er_Type & ERT_TYPEMASK) {
 190                 case ERT_ZORROIII:
 191                         z->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 192                         break;
 193
 194                 case ERT_ZORROII:
 195                 default:
 196                         z->dev.coherent_dma_mask = DMA_BIT_MASK(24);
 197                         break;
 198                 }
 199                 z->dev.dma_mask = &z->dev.coherent_dma_mask;
 200         }
 201
 202         /* ... then register them */
 203         for (i = 0; i < zorro_num_autocon; i++) {
 204                 z = &zorro_autocon[i];
 205                 error = device_register(&z->dev);
 206                 if (error) {
 207                         dev_err(&bus->dev, "Error registering device %s\n",
 208                                 z->name);
 209                         put_device(&z->dev);
 210                         continue;
 211                 }
 212         }
 213
 214         /* Mark all available Zorro II memory */
 215         zorro_for_each_dev(z) {
 216                 if (z->rom.er_Type & ERTF_MEMLIST)
 217                         mark_region(zorro_resource_start(z),
 218                                     zorro_resource_end(z)+1, 1);
 219         }
 220
 221         /* Unmark all used Zorro II memory */
 222         for (i = 0; i < m68k_num_memory; i++)
 223                 if (m68k_memory[i].addr < 16*1024*1024)
 224                         mark_region(m68k_memory[i].addr,
 225                                     m68k_memory[i].addr+m68k_memory[i].size,
 226                                     0);
 227
 228         return 0;
 229 }
 230
 231 static struct platform_driver amiga_zorro_driver = {
 232         .driver   = {
 233                 .name   = "amiga-zorro",
 234         },
 235 };
 236
 237 static int __init amiga_zorro_init(void)
 238 {
 239         return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 240 }
 241
 242 module_init(amiga_zorro_init);
 243
 244 MODULE_LICENSE("GPL");