drivers/tc/tc.c

   1 /*
   2  *      TURBOchannel bus services.
   3  *
   4  *      Copyright (c) Harald Koerfgen, 1998
   5  *      Copyright (c) 2001, 2003, 2005, 2006  Maciej W. Rozycki
   6  *      Copyright (c) 2005  James Simmons
   7  *
   8  *      This file is subject to the terms and conditions of the GNU
   9  *      General Public License.  See the file "COPYING" in the main
  10  *      directory of this archive for more details.
  11  */
  12 #include <linux/compiler.h>
  13 #include <linux/errno.h>
  14 #include <linux/init.h>
  15 #include <linux/ioport.h>
  16 #include <linux/kernel.h>
  17 #include <linux/list.h>
  18 #include <linux/module.h>
  19 #include <linux/string.h>
  20 #include <linux/tc.h>
  21 #include <linux/types.h>
  22
  23 #include <asm/io.h>
  24
  25 static struct tc_bus tc_bus = {
  26         .name = "TURBOchannel",
  27 };
  28
  29 /*
  30  * Probing for TURBOchannel modules.
  31  */
  32 static void __init tc_bus_add_devices(struct tc_bus *tbus)
  33 {
  34         resource_size_t slotsize = tbus->info.slot_size << 20;
  35         resource_size_t extslotsize = tbus->ext_slot_size;
  36         resource_size_t slotaddr;
  37         resource_size_t extslotaddr;
  38         resource_size_t devsize;
  39         void __iomem *module;
  40         struct tc_dev *tdev;
  41         int i, slot, err;
  42         u8 pattern[4];
  43         long offset;
  44
  45         for (slot = 0; slot < tbus->num_tcslots; slot++) {
  46                 slotaddr = tbus->slot_base + slot * slotsize;
  47                 extslotaddr = tbus->ext_slot_base + slot * extslotsize;
  48                 module = ioremap_nocache(slotaddr, slotsize);
  49                 BUG_ON(!module);
  50
  51                 offset = TC_OLDCARD;
  52
  53                 err = 0;
  54                 err |= tc_preadb(pattern + 0, module + offset + TC_PATTERN0);
  55                 err |= tc_preadb(pattern + 1, module + offset + TC_PATTERN1);
  56                 err |= tc_preadb(pattern + 2, module + offset + TC_PATTERN2);
  57                 err |= tc_preadb(pattern + 3, module + offset + TC_PATTERN3);
  58                 if (err)
  59                         goto out_err;
  60
  61                 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
  62                     pattern[2] != 0xaa || pattern[3] != 0xff) {
  63                         offset = TC_NEWCARD;
  64
  65                         err = 0;
  66                         err |= tc_preadb(pattern + 0,
  67                                          module + offset + TC_PATTERN0);
  68                         err |= tc_preadb(pattern + 1,
  69                                          module + offset + TC_PATTERN1);
  70                         err |= tc_preadb(pattern + 2,
  71                                          module + offset + TC_PATTERN2);
  72                         err |= tc_preadb(pattern + 3,
  73                                          module + offset + TC_PATTERN3);
  74                         if (err)
  75                                 goto out_err;
  76                 }
  77
  78                 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
  79                     pattern[2] != 0xaa || pattern[3] != 0xff)
  80                         goto out_err;
  81
  82                 /* Found a board, allocate it an entry in the list */
  83                 tdev = kzalloc(sizeof(*tdev), GFP_KERNEL);
  84                 if (!tdev) {
  85                         printk(KERN_ERR "tc%x: unable to allocate tc_dev\n",
  86                                slot);
  87                         goto out_err;
  88                 }
  89                 sprintf(tdev->dev.bus_id, "tc%x", slot);
  90                 tdev->bus = tbus;
  91                 tdev->dev.parent = &tbus->dev;
  92                 tdev->dev.bus = &tc_bus_type;
  93                 tdev->slot = slot;
  94
  95                 for (i = 0; i < 8; i++) {
  96                         tdev->firmware[i] =
  97                                 readb(module + offset + TC_FIRM_VER + 4 * i);
  98                         tdev->vendor[i] =
  99                                 readb(module + offset + TC_VENDOR + 4 * i);
 100                         tdev->name[i] =
 101                                 readb(module + offset + TC_MODULE + 4 * i);
 102                 }
 103                 tdev->firmware[8] = 0;
 104                 tdev->vendor[8] = 0;
 105                 tdev->name[8] = 0;
 106
 107                 pr_info("%s: %s %s %s\n", tdev->dev.bus_id, tdev->vendor,
 108                         tdev->name, tdev->firmware);
 109
 110                 devsize = readb(module + offset + TC_SLOT_SIZE);
 111                 devsize <<= 22;
 112                 if (devsize <= slotsize) {
 113                         tdev->resource.start = slotaddr;
 114                         tdev->resource.end = slotaddr + devsize - 1;
 115                 } else if (devsize <= extslotsize) {
 116                         tdev->resource.start = extslotaddr;
 117                         tdev->resource.end = extslotaddr + devsize - 1;
 118                 } else {
 119                         printk(KERN_ERR "%s: Cannot provide slot space "
 120                                "(%dMiB required, up to %dMiB supported)\n",
 121                                tdev->dev.bus_id, devsize >> 20,
 122                                max(slotsize, extslotsize) >> 20);
 123                         kfree(tdev);
 124                         goto out_err;
 125                 }
 126                 tdev->resource.name = tdev->name;
 127                 tdev->resource.flags = IORESOURCE_MEM;
 128
 129                 tc_device_get_irq(tdev);
 130
 131                 device_register(&tdev->dev);
 132                 list_add_tail(&tdev->node, &tbus->devices);
 133
 134 out_err:
 135                 iounmap(module);
 136         }
 137 }
 138
 139 /*
 140  * The main entry.
 141  */
 142 static int __init tc_init(void)
 143 {
 144         /* Initialize the TURBOchannel bus */
 145         if (tc_bus_get_info(&tc_bus))
 146                 return 0;
 147
 148         INIT_LIST_HEAD(&tc_bus.devices);
 149         strcpy(tc_bus.dev.bus_id, "tc");
 150         device_register(&tc_bus.dev);
 151
 152         if (tc_bus.info.slot_size) {
 153                 unsigned int tc_clock = tc_get_speed(&tc_bus) / 100000;
 154
 155                 pr_info("tc: TURBOchannel rev. %d at %d.%d MHz "
 156                         "(with%s parity)\n", tc_bus.info.revision,
 157                         tc_clock / 10, tc_clock % 10,
 158                         tc_bus.info.parity ? "" : "out");
 159
 160                 tc_bus.resource[0].start = tc_bus.slot_base;
 161                 tc_bus.resource[0].end = tc_bus.slot_base +
 162                                          (tc_bus.info.slot_size << 20) *
 163                                          tc_bus.num_tcslots - 1;
 164                 tc_bus.resource[0].name = tc_bus.name;
 165                 tc_bus.resource[0].flags = IORESOURCE_MEM;
 166                 if (request_resource(&iomem_resource,
 167                                      &tc_bus.resource[0]) < 0) {
 168                         printk(KERN_ERR "tc: Cannot reserve resource\n");
 169                         return 0;
 170                 }
 171                 if (tc_bus.ext_slot_size) {
 172                         tc_bus.resource[1].start = tc_bus.ext_slot_base;
 173                         tc_bus.resource[1].end = tc_bus.ext_slot_base +
 174                                                  tc_bus.ext_slot_size *
 175                                                  tc_bus.num_tcslots - 1;
 176                         tc_bus.resource[1].name = tc_bus.name;
 177                         tc_bus.resource[1].flags = IORESOURCE_MEM;
 178                         if (request_resource(&iomem_resource,
 179                                              &tc_bus.resource[1]) < 0) {
 180                                 printk(KERN_ERR
 181                                        "tc: Cannot reserve resource\n");
 182                                 release_resource(&tc_bus.resource[0]);
 183                                 return 0;
 184                         }
 185                 }
 186
 187                 tc_bus_add_devices(&tc_bus);
 188         }
 189
 190         return 0;
 191 }
 192
 193 subsys_initcall(tc_init);