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
 105                 if (flag)
 106                         set_bit(chunk, zorro_unused_z2ram);
 107                 else
 108                         clear_bit(chunk, zorro_unused_z2ram);
 109                 start += Z2RAM_CHUNKSIZE;
 110         }
 111 }
 112
 113
 114 static struct resource __init *zorro_find_parent_resource(
 115         struct platform_device *bridge, struct zorro_dev *z)
 116 {
 117         int i;
 118
 119         for (i = 0; i < bridge->num_resources; i++) {
 120                 struct resource *r = &bridge->resource[i];
 121
 122                 if (zorro_resource_start(z) >= r->start &&
 123                     zorro_resource_end(z) <= r->end)
 124                         return r;
 125         }
 126         return &iomem_resource;
 127 }
 128
 129
 130
 131 static int __init amiga_zorro_probe(struct platform_device *pdev)
 132 {
 133         struct zorro_bus *bus;
 134         struct zorro_dev_init *zi;
 135         struct zorro_dev *z;
 136         struct resource *r;
 137         unsigned int i;
 138         int error;
 139
 140         /* Initialize the Zorro bus */
 141         bus = kzalloc(struct_size(bus, devices, zorro_num_autocon),
 142                       GFP_KERNEL);
 143         if (!bus)
 144                 return -ENOMEM;
 145
 146         zorro_autocon = bus->devices;
 147         bus->dev.parent = &pdev->dev;
 148         dev_set_name(&bus->dev, zorro_bus_type.name);
 149         error = device_register(&bus->dev);
 150         if (error) {
 151                 pr_err("Zorro: Error registering zorro_bus\n");
 152                 put_device(&bus->dev);
 153                 kfree(bus);
 154                 return error;
 155         }
 156         platform_set_drvdata(pdev, bus);
 157
 158         pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
 159                  zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
 160
 161         /* First identify all devices ... */
 162         for (i = 0; i < zorro_num_autocon; i++) {
 163                 zi = &zorro_autocon_init[i];
 164                 z = &zorro_autocon[i];
 165
 166                 z->rom = zi->rom;
 167                 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |
 168                         (z->rom.er_Product << 8);
 169                 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
 170                         /* GVP quirk */
 171                         unsigned long magic = zi->boardaddr + 0x8000;
 172
 173                         z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
 174                 }
 175                 z->slotaddr = zi->slotaddr;
 176                 z->slotsize = zi->slotsize;
 177                 sprintf(z->name, "Zorro device %08x", z->id);
 178                 zorro_name_device(z);
 179                 z->resource.start = zi->boardaddr;
 180                 z->resource.end = zi->boardaddr + zi->boardsize - 1;
 181                 z->resource.name = z->name;
 182                 r = zorro_find_parent_resource(pdev, z);
 183                 error = request_resource(r, &z->resource);
 184                 if (error)
 185                         dev_err(&bus->dev,
 186                                 "Address space collision on device %s %pR\n",
 187                                 z->name, &z->resource);
 188                 z->dev.parent = &bus->dev;
 189                 z->dev.bus = &zorro_bus_type;
 190                 z->dev.id = i;
 191                 switch (z->rom.er_Type & ERT_TYPEMASK) {
 192                 case ERT_ZORROIII:
 193                         z->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 194                         break;
 195
 196                 case ERT_ZORROII:
 197                 default:
 198                         z->dev.coherent_dma_mask = DMA_BIT_MASK(24);
 199                         break;
 200                 }
 201                 z->dev.dma_mask = &z->dev.coherent_dma_mask;
 202         }
 203
 204         /* ... then register them */
 205         for (i = 0; i < zorro_num_autocon; i++) {
 206                 z = &zorro_autocon[i];
 207                 error = device_register(&z->dev);
 208                 if (error) {
 209                         dev_err(&bus->dev, "Error registering device %s\n",
 210                                 z->name);
 211                         put_device(&z->dev);
 212                         continue;
 213                 }
 214         }
 215
 216         /* Mark all available Zorro II memory */
 217         zorro_for_each_dev(z) {
 218                 if (z->rom.er_Type & ERTF_MEMLIST)
 219                         mark_region(zorro_resource_start(z),
 220                                     zorro_resource_end(z)+1, 1);
 221         }
 222
 223         /* Unmark all used Zorro II memory */
 224         for (i = 0; i < m68k_num_memory; i++)
 225                 if (m68k_memory[i].addr < 16*1024*1024)
 226                         mark_region(m68k_memory[i].addr,
 227                                     m68k_memory[i].addr+m68k_memory[i].size,
 228                                     0);
 229
 230         return 0;
 231 }
 232
 233 static struct platform_driver amiga_zorro_driver = {
 234         .driver   = {
 235                 .name   = "amiga-zorro",
 236         },
 237 };
 238
 239 static int __init amiga_zorro_init(void)
 240 {
 241         return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 242 }
 243
 244 module_init(amiga_zorro_init);
 245
 246 MODULE_LICENSE("GPL");