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 #include <linux/string_choices.h>
  22
  23 #include <asm/byteorder.h>
  24 #include <asm/setup.h>
  25 #include <asm/amigahw.h>
  26
  27 #include "zorro.h"
  28
  29
  30     /*
  31      *  Zorro Expansion Devices
  32      */
  33
  34 unsigned int zorro_num_autocon;
  35 struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
  36 struct zorro_dev *zorro_autocon;
  37
  38
  39     /*
  40      *  Zorro bus
  41      */
  42
  43 struct zorro_bus {
  44         struct device dev;
  45         struct zorro_dev devices[];
  46 };
  47
  48
  49     /*
  50      *  Find Zorro Devices
  51      */
  52
  53 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
  54 {
  55         struct zorro_dev *z;
  56
  57         if (!zorro_num_autocon)
  58                 return NULL;
  59
  60         for (z = from ? from+1 : &zorro_autocon[0];
  61              z < zorro_autocon+zorro_num_autocon;
  62              z++)
  63                 if (id == ZORRO_WILDCARD || id == z->id)
  64                         return z;
  65         return NULL;
  66 }
  67 EXPORT_SYMBOL(zorro_find_device);
  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 EXPORT_SYMBOL(zorro_unused_z2ram);
  87
  88
  89 static void __init mark_region(unsigned long start, unsigned long end,
  90                                int flag)
  91 {
  92         if (flag)
  93                 start += Z2RAM_CHUNKMASK;
  94         else
  95                 end += Z2RAM_CHUNKMASK;
  96         start &= ~Z2RAM_CHUNKMASK;
  97         end &= ~Z2RAM_CHUNKMASK;
  98
  99         if (end <= Z2RAM_START || start >= Z2RAM_END)
 100                 return;
 101         start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
 102         end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
 103         while (start < end) {
 104                 u32 chunk = start>>Z2RAM_CHUNKSHIFT;
 105
 106                 if (flag)
 107                         set_bit(chunk, zorro_unused_z2ram);
 108                 else
 109                         clear_bit(chunk, zorro_unused_z2ram);
 110                 start += Z2RAM_CHUNKSIZE;
 111         }
 112 }
 113
 114
 115 static struct resource __init *zorro_find_parent_resource(
 116         struct platform_device *bridge, struct zorro_dev *z)
 117 {
 118         int i;
 119
 120         for (i = 0; i < bridge->num_resources; i++) {
 121                 if (resource_contains(&bridge->resource[i], &z->resource))
 122                         return &bridge->resource[i];
 123         }
 124
 125         return &iomem_resource;
 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(struct_size(bus, devices, zorro_num_autocon),
 139                       GFP_KERNEL);
 140         if (!bus)
 141                 return -ENOMEM;
 142
 143         zorro_autocon = bus->devices;
 144         bus->dev.parent = &pdev->dev;
 145         dev_set_name(&bus->dev, zorro_bus_type.name);
 146         error = device_register(&bus->dev);
 147         if (error) {
 148                 pr_err("Zorro: Error registering zorro_bus\n");
 149                 put_device(&bus->dev);
 150                 kfree(bus);
 151                 return error;
 152         }
 153         platform_set_drvdata(pdev, bus);
 154
 155         pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
 156                  zorro_num_autocon, str_plural(zorro_num_autocon));
 157
 158         /* First identify all devices ... */
 159         for (i = 0; i < zorro_num_autocon; i++) {
 160                 zi = &zorro_autocon_init[i];
 161                 z = &zorro_autocon[i];
 162
 163                 z->rom = zi->rom;
 164                 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |
 165                         (z->rom.er_Product << 8);
 166                 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
 167                         /* GVP quirk */
 168                         unsigned long magic = zi->boardaddr + 0x8000;
 169
 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 = DEFINE_RES_MEM_NAMED(zi->boardaddr, zi->boardsize, z->name);
 177                 r = zorro_find_parent_resource(pdev, z);
 178                 error = request_resource(r, &z->resource);
 179                 if (error && !(z->rom.er_Type & ERTF_MEMLIST))
 180                         dev_err(&bus->dev,
 181                                 "Address space collision on device %s %pR\n",
 182                                 z->name, &z->resource);
 183                 z->dev.parent = &bus->dev;
 184                 z->dev.bus = &zorro_bus_type;
 185                 z->dev.id = i;
 186                 switch (z->rom.er_Type & ERT_TYPEMASK) {
 187                 case ERT_ZORROIII:
 188                         z->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 189                         break;
 190
 191                 case ERT_ZORROII:
 192                 default:
 193                         z->dev.coherent_dma_mask = DMA_BIT_MASK(24);
 194                         break;
 195                 }
 196                 z->dev.dma_mask = &z->dev.coherent_dma_mask;
 197         }
 198
 199         /* ... then register them */
 200         for (i = 0; i < zorro_num_autocon; i++) {
 201                 z = &zorro_autocon[i];
 202                 error = device_register(&z->dev);
 203                 if (error) {
 204                         dev_err(&bus->dev, "Error registering device %s\n",
 205                                 z->name);
 206                         put_device(&z->dev);
 207                         continue;
 208                 }
 209         }
 210
 211         /* Mark all available Zorro II memory */
 212         zorro_for_each_dev(z) {
 213                 if (z->rom.er_Type & ERTF_MEMLIST)
 214                         mark_region(zorro_resource_start(z),
 215                                     zorro_resource_end(z)+1, 1);
 216         }
 217
 218         /* Unmark all used Zorro II memory */
 219         for (i = 0; i < m68k_num_memory; i++)
 220                 if (m68k_memory[i].addr < 16*1024*1024)
 221                         mark_region(m68k_memory[i].addr,
 222                                     m68k_memory[i].addr+m68k_memory[i].size,
 223                                     0);
 224
 225         return 0;
 226 }
 227
 228 static struct platform_driver amiga_zorro_driver = {
 229         .driver   = {
 230                 .name   = "amiga-zorro",
 231         },
 232 };
 233
 234 static int __init amiga_zorro_init(void)
 235 {
 236         return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 237 }
 238
 239 module_init(amiga_zorro_init);
 240
 241 MODULE_LICENSE("GPL");