linux/drivers/dio/dio.c
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   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
  37struct 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 */
  59struct 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
  69static 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
  91static const char *unknowndioname 
  92        = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
  93
  94static 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
 107static char dio_no_name[] = { 0 };
 108#define dio_getname(_id)        (dio_no_name)
 109
 110#endif /* CONFIG_DIO_CONSTANTS */
 111
 112int __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 */
 170static int __init dio_init(void)
 171{
 172        int scode;
 173        mm_segment_t fs;
 174        int i;
 175        struct dio_dev *dev;
 176        int error;
 177
 178        if (!MACH_IS_HP300)
 179                return 0;
 180
 181        printk(KERN_INFO "Scanning for DIO devices...\n");
 182
 183        /* Initialize the DIO bus */ 
 184        INIT_LIST_HEAD(&dio_bus.devices);
 185        dev_set_name(&dio_bus.dev, "dio");
 186        error = device_register(&dio_bus.dev);
 187        if (error) {
 188                pr_err("DIO: Error registering dio_bus\n");
 189                return error;
 190        }
 191
 192        /* Request all resources */
 193        dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
 194        for (i = 0; i < dio_bus.num_resources; i++)
 195                request_resource(&iomem_resource, &dio_bus.resources[i]);
 196
 197        /* Register all devices */
 198        for (scode = 0; scode < DIO_SCMAX; ++scode)
 199        {
 200                u_char prid, secid = 0;        /* primary, secondary ID bytes */
 201                u_char *va;
 202                unsigned long pa;
 203                
 204                if (DIO_SCINHOLE(scode))
 205                        continue;
 206
 207                pa = dio_scodetophysaddr(scode);
 208
 209                if (!pa)
 210                        continue;
 211
 212                if (scode < DIOII_SCBASE)
 213                        va = (void *)(pa + DIO_VIRADDRBASE);
 214                else
 215                        va = ioremap(pa, PAGE_SIZE);
 216
 217                fs = get_fs();
 218                set_fs(KERNEL_DS);
 219
 220                if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
 221                        set_fs(fs);
 222                        if (scode >= DIOII_SCBASE)
 223                                iounmap(va);
 224                        continue;              /* no board present at that select code */
 225                }
 226
 227                set_fs(fs);
 228
 229                /* Found a board, allocate it an entry in the list */
 230                dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
 231                if (!dev)
 232                        return 0;
 233
 234                dev->bus = &dio_bus;
 235                dev->dev.parent = &dio_bus.dev;
 236                dev->dev.bus = &dio_bus_type;
 237                dev->scode = scode;
 238                dev->resource.start = pa;
 239                dev->resource.end = pa + DIO_SIZE(scode, va);
 240                dev_set_name(&dev->dev, "%02x", scode);
 241
 242                /* read the ID byte(s) and encode if necessary. */
 243                prid = DIO_ID(va);
 244
 245                if (DIO_NEEDSSECID(prid)) {
 246                        secid = DIO_SECID(va);
 247                        dev->id = DIO_ENCODE_ID(prid, secid);
 248                } else
 249                        dev->id = prid;
 250
 251                dev->ipl = DIO_IPL(va);
 252                strcpy(dev->name,dio_getname(dev->id));
 253                printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
 254                if (DIO_NEEDSSECID(prid))
 255                        printk(":%02X", secid);
 256                printk(": %s\n", dev->name);
 257
 258                if (scode >= DIOII_SCBASE)
 259                        iounmap(va);
 260                error = device_register(&dev->dev);
 261                if (error) {
 262                        pr_err("DIO: Error registering device %s\n",
 263                               dev->name);
 264                        continue;
 265                }
 266                error = dio_create_sysfs_dev_files(dev);
 267                if (error)
 268                        dev_err(&dev->dev, "Error creating sysfs files\n");
 269        }
 270        return 0;
 271}
 272
 273subsys_initcall(dio_init);
 274
 275/* Bear in mind that this is called in the very early stages of initialisation
 276 * in order to get the address of the serial port for the console...
 277 */
 278unsigned long dio_scodetophysaddr(int scode)
 279{
 280        if (scode >= DIOII_SCBASE) {
 281                return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
 282        } else if (scode > DIO_SCMAX || scode < 0)
 283                return 0;
 284        else if (DIO_SCINHOLE(scode))
 285                return 0;
 286
 287        return (DIO_BASE + scode * DIO_DEVSIZE);
 288}
 289
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