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 #define NUMNAMES (sizeof(names) / sizeof(struct dioname))
  92
  93 static const char *unknowndioname
  94         = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
  95
  96 static const char *dio_getname(int id)
  97 {
  98         /* return pointer to a constant string describing the board with given ID */
  99         unsigned int i;
 100         for (i = 0; i < NUMNAMES; i++)
 101                 if (names[i].id == id)
 102                         return names[i].name;
 103
 104         return unknowndioname;
 105 }
 106
 107 #else
 108
 109 static char dio_no_name[] = { 0 };
 110 #define dio_getname(_id)        (dio_no_name)
 111
 112 #endif /* CONFIG_DIO_CONSTANTS */
 113
 114 int __init dio_find(int deviceid)
 115 {
 116         /* Called to find a DIO device before the full bus scan has run.
 117          * Only used by the console driver.
 118          */
 119         int scode, id;
 120         u_char prid, secid, i;
 121         mm_segment_t fs;
 122
 123         for (scode = 0; scode < DIO_SCMAX; scode++) {
 124                 void *va;
 125                 unsigned long pa;
 126
 127                 if (DIO_SCINHOLE(scode))
 128                         continue;
 129
 130                 pa = dio_scodetophysaddr(scode);
 131
 132                 if (!pa)
 133                         continue;
 134
 135                 if (scode < DIOII_SCBASE)
 136                         va = (void *)(pa + DIO_VIRADDRBASE);
 137                 else
 138                         va = ioremap(pa, PAGE_SIZE);
 139
 140                 fs = get_fs();
 141                 set_fs(KERNEL_DS);
 142
 143                 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
 144                         set_fs(fs);
 145                         if (scode >= DIOII_SCBASE)
 146                                 iounmap(va);
 147                         continue;             /* no board present at that select code */
 148                 }
 149
 150                 set_fs(fs);
 151                 prid = DIO_ID(va);
 152
 153                 if (DIO_NEEDSSECID(prid)) {
 154                         secid = DIO_SECID(va);
 155                         id = DIO_ENCODE_ID(prid, secid);
 156                 } else
 157                         id = prid;
 158
 159                 if (id == deviceid) {
 160                         if (scode >= DIOII_SCBASE)
 161                                 iounmap(va);
 162                         return scode;
 163                 }
 164         }
 165
 166         return -1;
 167 }
 168
 169 /* This is the function that scans the DIO space and works out what
 170  * hardware is actually present.
 171  */
 172 static int __init dio_init(void)
 173 {
 174         int scode;
 175         mm_segment_t fs;
 176         int i;
 177         struct dio_dev *dev;
 178
 179         if (!MACH_IS_HP300)
 180                 return 0;
 181
 182         printk(KERN_INFO "Scanning for DIO devices...\n");
 183
 184         /* Initialize the DIO bus */
 185         INIT_LIST_HEAD(&dio_bus.devices);
 186         strcpy(dio_bus.dev.bus_id, "dio");
 187         device_register(&dio_bus.dev);
 188
 189         /* Request all resources */
 190         dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
 191         for (i = 0; i < dio_bus.num_resources; i++)
 192                 request_resource(&iomem_resource, &dio_bus.resources[i]);
 193
 194         /* Register all devices */
 195         for (scode = 0; scode < DIO_SCMAX; ++scode)
 196         {
 197                 u_char prid, secid = 0;        /* primary, secondary ID bytes */
 198                 u_char *va;
 199                 unsigned long pa;
 200
 201                 if (DIO_SCINHOLE(scode))
 202                         continue;
 203
 204                 pa = dio_scodetophysaddr(scode);
 205
 206                 if (!pa)
 207                         continue;
 208
 209                 if (scode < DIOII_SCBASE)
 210                         va = (void *)(pa + DIO_VIRADDRBASE);
 211                 else
 212                         va = ioremap(pa, PAGE_SIZE);
 213
 214                 fs = get_fs();
 215                 set_fs(KERNEL_DS);
 216
 217                 if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
 218                         set_fs(fs);
 219                         if (scode >= DIOII_SCBASE)
 220                                 iounmap(va);
 221                         continue;              /* no board present at that select code */
 222                 }
 223
 224                 set_fs(fs);
 225
 226                 /* Found a board, allocate it an entry in the list */
 227                 dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
 228                 if (!dev)
 229                         return 0;
 230
 231                 dev->bus = &dio_bus;
 232                 dev->dev.parent = &dio_bus.dev;
 233                 dev->dev.bus = &dio_bus_type;
 234                 dev->scode = scode;
 235                 dev->resource.start = pa;
 236                 dev->resource.end = pa + DIO_SIZE(scode, va);
 237                 sprintf(dev->dev.bus_id,"%02x", scode);
 238
 239                 /* read the ID byte(s) and encode if necessary. */
 240                 prid = DIO_ID(va);
 241
 242                 if (DIO_NEEDSSECID(prid)) {
 243                         secid = DIO_SECID(va);
 244                         dev->id = DIO_ENCODE_ID(prid, secid);
 245                 } else
 246                         dev->id = prid;
 247
 248                 dev->ipl = DIO_IPL(va);
 249                 strcpy(dev->name,dio_getname(dev->id));
 250                 printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
 251                 if (DIO_NEEDSSECID(prid))
 252                         printk(":%02X", secid);
 253                 printk(": %s\n", dev->name);
 254
 255                 if (scode >= DIOII_SCBASE)
 256                         iounmap(va);
 257                 device_register(&dev->dev);
 258                 dio_create_sysfs_dev_files(dev);
 259         }
 260         return 0;
 261 }
 262
 263 subsys_initcall(dio_init);
 264
 265 /* Bear in mind that this is called in the very early stages of initialisation
 266  * in order to get the address of the serial port for the console...
 267  */
 268 unsigned long dio_scodetophysaddr(int scode)
 269 {
 270         if (scode >= DIOII_SCBASE) {
 271                 return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
 272         } else if (scode > DIO_SCMAX || scode < 0)
 273                 return 0;
 274         else if (DIO_SCINHOLE(scode))
 275                 return 0;
 276
 277         return (DIO_BASE + scode * DIO_DEVSIZE);
 278 }