linux/drivers/zorro/zorro.c
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   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
  32unsigned int zorro_num_autocon;
  33struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
  34struct zorro_dev *zorro_autocon;
  35
  36
  37    /*
  38     *  Zorro bus
  39     */
  40
  41struct zorro_bus {
  42        struct device dev;
  43        struct zorro_dev devices[0];
  44};
  45
  46
  47    /*
  48     *  Find Zorro Devices
  49     */
  50
  51struct 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}
  65EXPORT_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
  83DECLARE_BITMAP(zorro_unused_z2ram, 128);
  84EXPORT_SYMBOL(zorro_unused_z2ram);
  85
  86
  87static 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
 112static 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
 128static 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                error = zorro_create_sysfs_dev_files(z);
 201                if (error)
 202                        dev_err(&z->dev, "Error creating sysfs files\n");
 203        }
 204
 205        /* Mark all available Zorro II memory */
 206        zorro_for_each_dev(z) {
 207                if (z->rom.er_Type & ERTF_MEMLIST)
 208                        mark_region(zorro_resource_start(z),
 209                                    zorro_resource_end(z)+1, 1);
 210        }
 211
 212        /* Unmark all used Zorro II memory */
 213        for (i = 0; i < m68k_num_memory; i++)
 214                if (m68k_memory[i].addr < 16*1024*1024)
 215                        mark_region(m68k_memory[i].addr,
 216                                    m68k_memory[i].addr+m68k_memory[i].size,
 217                                    0);
 218
 219        return 0;
 220}
 221
 222static struct platform_driver amiga_zorro_driver = {
 223        .driver   = {
 224                .name   = "amiga-zorro",
 225        },
 226};
 227
 228static int __init amiga_zorro_init(void)
 229{
 230        return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
 231}
 232
 233module_init(amiga_zorro_init);
 234
 235MODULE_LICENSE("GPL");
 236