drivers/dio/dio.c

   1 /* Code to support devices on the DIO and DIO-II bus
   2  * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
   3  * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>
   4  *
   5  * This code has basically these routines at the moment:
   6  * int dio_find(u_int deviceid)
   7  *    Search the list of DIO devices and return the select code
   8  *    of the next unconfigured device found that matches the given device ID.
   9  *    Note that the deviceid parameter should be the encoded ID.
  10  *    This means that framebuffers should pass it as
  11  *    DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
  12  *    (or whatever); everybody else just uses DIO_ID_FOOBAR.
  13  * unsigned long dio_scodetophysaddr(int scode)
  14  *    Return the physical address corresponding to the given select code.
  15  * int dio_scodetoipl(int scode)
  16  *    Every DIO card has a fixed interrupt priority level. This function
  17  *    returns it, whatever it is.
  18  * const char *dio_scodetoname(int scode)
  19  *    Return a character string describing this board [might be "" if
  20  *    not CONFIG_DIO_CONSTANTS]
  21  * void dio_config_board(int scode)     mark board as configured in the list
  22  * void dio_unconfig_board(int scode)   mark board as no longer configured
  23  *
  24  * This file is based on the way the Amiga port handles Zorro II cards,
  25  * although we aren't so complicated...
  26  */
  27 #include <linux/module.h>
  28 #include <linux/string.h>
  29 #include <linux/types.h>
  30 #include <linux/kernel.h>
  31 #include <linux/init.h>
  32 #include <linux/dio.h>
  33 #include <linux/slab.h>                         /* kmalloc() */
  34 #include <asm/uaccess.h>
  35 #include <asm/io.h>                             /* readb() */
  36
  37 struct dio_bus dio_bus = {
  38         .resources = {
  39                 /* DIO range */
  40                 { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
  41                 /* DIO-II range */
  42                 { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
  43         },
  44         .name = "DIO bus"
  45 };
  46
  47 /* not a real config option yet! */
  48 #define CONFIG_DIO_CONSTANTS
  49
  50 #ifdef CONFIG_DIO_CONSTANTS
  51 /* We associate each numeric ID with an appropriate descriptive string
  52  * using a constant array of these structs.
  53  * FIXME: we should be able to arrange to throw away most of the strings
  54  * using the initdata stuff. Then we wouldn't need to worry about
  55  * carrying them around...
  56  * I think we do this by copying them into newly kmalloc()ed memory and
  57  * marking the names[] array as .initdata ?
  58  */
  59 struct dioname
  60 {
  61         int id;
  62         const char *name;
  63 };
  64
  65 /* useful macro */
  66 #define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
  67 #define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
  68
  69 static struct dioname names[] =
  70 {
  71         DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
  72         DIONAME(DCM), DIONAME(DCMREM),
  73         DIONAME(LAN),
  74         DIONAME(FHPIB), DIONAME(NHPIB),
  75         DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
  76         DIONAME(FBUFFER),
  77         DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
  78         DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
  79         DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
  80         DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
  81         DIONAME(MISC12), DIONAME(MISC13),
  82         DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
  83         DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
  84         DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
  85         DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
  86 };
  87
  88 #undef DIONAME
  89 #undef DIOFBNAME
  90
  91 static const char *unknowndioname
  92         = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
  93
  94 static const char *dio_getname(int id)
  95 {
  96         /* return pointer to a constant string describing the board with given ID */
  97         unsigned int i;
  98         for (i = 0; i < ARRAY_SIZE(names); i++)
  99                 if (names[i].id == id)
 100                         return names[i].name;
 101
 102         return unknowndioname;
 103 }
 104
 105 #else
 106
 107 static char dio_no_name[] = { 0 };
 108 #define dio_getname(_id)        (dio_no_name)
 109
 110 #endif /* CONFIG_DIO_CONSTANTS */
 111
 112 int __init dio_find(int deviceid)
 113 {
 114         /* Called to find a DIO device before the full bus scan has run.
 115          * Only used by the console driver.
 116          */
 117         int scode, id;
 118         u_char prid, secid, i;
 119         mm_segment_t fs;
 120
 121         for (scode = 0; scode < DIO_SCMAX; scode++) {
 122                 void *va;
 123                 unsigned long pa;
 124
 125                 if (DIO_SCINHOLE(scode))
 126                         continue;
 127
 128                 pa = dio_scodetophysaddr(scode);
 129
 130                 if (!pa)
 131                         continue;
 132
 133                 if (scode < DIOII_SCBASE)
 134                         va = (void *)(pa + DIO_VIRADDRBASE);
 135                 else
 136                         va = ioremap(pa, PAGE_SIZE);
 137
 138                 fs = get_fs();
 139                 set_fs(KERNEL_DS);
 140
 141                 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
 142                         set_fs(fs);
 143                         if (scode >= DIOII_SCBASE)
 144                                 iounmap(va);
 145                         continue;             /* no board present at that select code */
 146                 }
 147
 148                 set_fs(fs);
 149                 prid = DIO_ID(va);
 150
 151                 if (DIO_NEEDSSECID(prid)) {
 152                         secid = DIO_SECID(va);
 153                         id = DIO_ENCODE_ID(prid, secid);
 154                 } else
 155                         id = prid;
 156
 157                 if (id == deviceid) {
 158                         if (scode >= DIOII_SCBASE)
 159                                 iounmap(va);
 160                         return scode;
 161                 }
 162         }
 163
 164         return -1;
 165 }
 166
 167 /* This is the function that scans the DIO space and works out what
 168  * hardware is actually present.
 169  */
 170 static int __init dio_init(void)
 171 {
 172         int scode;
 173         mm_segment_t fs;
 174         int i;
 175         struct dio_dev *dev;
 176
 177         if (!MACH_IS_HP300)
 178                 return 0;
 179
 180         printk(KERN_INFO "Scanning for DIO devices...\n");
 181
 182         /* Initialize the DIO bus */
 183         INIT_LIST_HEAD(&dio_bus.devices);
 184         strcpy(dio_bus.dev.bus_id, "dio");
 185         device_register(&dio_bus.dev);
 186
 187         /* Request all resources */
 188         dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
 189         for (i = 0; i < dio_bus.num_resources; i++)
 190                 request_resource(&iomem_resource, &dio_bus.resources[i]);
 191
 192         /* Register all devices */
 193         for (scode = 0; scode < DIO_SCMAX; ++scode)
 194         {
 195                 u_char prid, secid = 0;        /* primary, secondary ID bytes */
 196                 u_char *va;
 197                 unsigned long pa;
 198
 199                 if (DIO_SCINHOLE(scode))
 200                         continue;
 201
 202                 pa = dio_scodetophysaddr(scode);
 203
 204                 if (!pa)
 205                         continue;
 206
 207                 if (scode < DIOII_SCBASE)
 208                         va = (void *)(pa + DIO_VIRADDRBASE);
 209                 else
 210                         va = ioremap(pa, PAGE_SIZE);
 211
 212                 fs = get_fs();
 213                 set_fs(KERNEL_DS);
 214
 215                 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
 216                         set_fs(fs);
 217                         if (scode >= DIOII_SCBASE)
 218                                 iounmap(va);
 219                         continue;              /* no board present at that select code */
 220                 }
 221
 222                 set_fs(fs);
 223
 224                 /* Found a board, allocate it an entry in the list */
 225                 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
 226                 if (!dev)
 227                         return 0;
 228
 229                 dev->bus = &dio_bus;
 230                 dev->dev.parent = &dio_bus.dev;
 231                 dev->dev.bus = &dio_bus_type;
 232                 dev->scode = scode;
 233                 dev->resource.start = pa;
 234                 dev->resource.end = pa + DIO_SIZE(scode, va);
 235                 sprintf(dev->dev.bus_id,"%02x", scode);
 236
 237                 /* read the ID byte(s) and encode if necessary. */
 238                 prid = DIO_ID(va);
 239
 240                 if (DIO_NEEDSSECID(prid)) {
 241                         secid = DIO_SECID(va);
 242                         dev->id = DIO_ENCODE_ID(prid, secid);
 243                 } else
 244                         dev->id = prid;
 245
 246                 dev->ipl = DIO_IPL(va);
 247                 strcpy(dev->name,dio_getname(dev->id));
 248                 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
 249                 if (DIO_NEEDSSECID(prid))
 250                         printk(":%02X", secid);
 251                 printk(": %s\n", dev->name);
 252
 253                 if (scode >= DIOII_SCBASE)
 254                         iounmap(va);
 255                 device_register(&dev->dev);
 256                 dio_create_sysfs_dev_files(dev);
 257         }
 258         return 0;
 259 }
 260
 261 subsys_initcall(dio_init);
 262
 263 /* Bear in mind that this is called in the very early stages of initialisation
 264  * in order to get the address of the serial port for the console...
 265  */
 266 unsigned long dio_scodetophysaddr(int scode)
 267 {
 268         if (scode >= DIOII_SCBASE) {
 269                 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
 270         } else if (scode > DIO_SCMAX || scode < 0)
 271                 return 0;
 272         else if (DIO_SCINHOLE(scode))
 273                 return 0;
 274
 275         return (DIO_BASE + scode * DIO_DEVSIZE);
 276 }