arch/x86/kernel/mca_32.c

   1 /*
   2  *  Written by Martin Kolinek, February 1996
   3  *
   4  * Changes:
   5  *
   6  *      Chris Beauregard July 28th, 1996
   7  *      - Fixed up integrated SCSI detection
   8  *
   9  *      Chris Beauregard August 3rd, 1996
  10  *      - Made mca_info local
  11  *      - Made integrated registers accessible through standard function calls
  12  *      - Added name field
  13  *      - More sanity checking
  14  *
  15  *      Chris Beauregard August 9th, 1996
  16  *      - Rewrote /proc/mca
  17  *
  18  *      Chris Beauregard January 7th, 1997
  19  *      - Added basic NMI-processing
  20  *      - Added more information to mca_info structure
  21  *
  22  *      David Weinehall October 12th, 1998
  23  *      - Made a lot of cleaning up in the source
  24  *      - Added use of save_flags / restore_flags
  25  *      - Added the 'driver_loaded' flag in MCA_adapter
  26  *      - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
  27  *
  28  *      David Weinehall March 24th, 1999
  29  *      - Fixed the output of 'Driver Installed' in /proc/mca/pos
  30  *      - Made the Integrated Video & SCSI show up even if they have id 0000
  31  *
  32  *      Alexander Viro November 9th, 1999
  33  *      - Switched to regular procfs methods
  34  *
  35  *      Alfred Arnold & David Weinehall August 23rd, 2000
  36  *      - Added support for Planar POS-registers
  37  */
  38
  39 #include <linux/module.h>
  40 #include <linux/types.h>
  41 #include <linux/errno.h>
  42 #include <linux/kernel.h>
  43 #include <linux/mca.h>
  44 #include <linux/kprobes.h>
  45 #include <linux/slab.h>
  46 #include <asm/system.h>
  47 #include <asm/io.h>
  48 #include <linux/proc_fs.h>
  49 #include <linux/mman.h>
  50 #include <linux/mm.h>
  51 #include <linux/pagemap.h>
  52 #include <linux/ioport.h>
  53 #include <asm/uaccess.h>
  54 #include <linux/init.h>
  55
  56 static unsigned char which_scsi;
  57
  58 int MCA_bus;
  59 EXPORT_SYMBOL(MCA_bus);
  60
  61 /*
  62  * Motherboard register spinlock. Untested on SMP at the moment, but
  63  * are there any MCA SMP boxes?
  64  *
  65  * Yes - Alan
  66  */
  67 static DEFINE_SPINLOCK(mca_lock);
  68
  69 /* Build the status info for the adapter */
  70
  71 static void mca_configure_adapter_status(struct mca_device *mca_dev)
  72 {
  73         mca_dev->status = MCA_ADAPTER_NONE;
  74
  75         mca_dev->pos_id = mca_dev->pos[0]
  76                 + (mca_dev->pos[1] << 8);
  77
  78         if (!mca_dev->pos_id && mca_dev->slot < MCA_MAX_SLOT_NR) {
  79
  80                 /*
  81                  * id = 0x0000 usually indicates hardware failure,
  82                  * however, ZP Gu (zpg@castle.net> reports that his 9556
  83                  * has 0x0000 as id and everything still works. There
  84                  * also seem to be an adapter with id = 0x0000; the
  85                  * NCR Parallel Bus Memory Card. Until this is confirmed,
  86                  * however, this code will stay.
  87                  */
  88
  89                 mca_dev->status = MCA_ADAPTER_ERROR;
  90
  91                 return;
  92         } else if (mca_dev->pos_id != 0xffff) {
  93
  94                 /*
  95                  * 0xffff usually indicates that there's no adapter,
  96                  * however, some integrated adapters may have 0xffff as
  97                  * their id and still be valid. Examples are on-board
  98                  * VGA of the 55sx, the integrated SCSI of the 56 & 57,
  99                  * and possibly also the 95 ULTIMEDIA.
 100                  */
 101
 102                 mca_dev->status = MCA_ADAPTER_NORMAL;
 103         }
 104
 105         if ((mca_dev->pos_id == 0xffff ||
 106             mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
 107                 int j;
 108
 109                 for (j = 2; j < 8; j++) {
 110                         if (mca_dev->pos[j] != 0xff) {
 111                                 mca_dev->status = MCA_ADAPTER_NORMAL;
 112                                 break;
 113                         }
 114                 }
 115         }
 116
 117         if (!(mca_dev->pos[2] & MCA_ENABLED)) {
 118
 119                 /* enabled bit is in POS 2 */
 120
 121                 mca_dev->status = MCA_ADAPTER_DISABLED;
 122         }
 123 } /* mca_configure_adapter_status */
 124
 125 /*--------------------------------------------------------------------*/
 126
 127 static struct resource mca_standard_resources[] = {
 128         { .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
 129         { .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
 130         { .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
 131         { .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
 132         { .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
 133         { .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
 134         { .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
 135 };
 136
 137 #define MCA_STANDARD_RESOURCES  ARRAY_SIZE(mca_standard_resources)
 138
 139 /*
 140  *      mca_read_and_store_pos - read the POS registers into a memory buffer
 141  *      @pos: a char pointer to 8 bytes, contains the POS register value on
 142  *            successful return
 143  *
 144  *      Returns 1 if a card actually exists (i.e. the pos isn't
 145  *      all 0xff) or 0 otherwise
 146  */
 147 static int mca_read_and_store_pos(unsigned char *pos)
 148 {
 149         int j;
 150         int found = 0;
 151
 152         for (j = 0; j < 8; j++) {
 153                 pos[j] = inb_p(MCA_POS_REG(j));
 154                 if (pos[j] != 0xff) {
 155                         /* 0xff all across means no device. 0x00 means
 156                          * something's broken, but a device is
 157                          * probably there.  However, if you get 0x00
 158                          * from a motherboard register it won't matter
 159                          * what we find.  For the record, on the
 160                          * 57SLC, the integrated SCSI adapter has
 161                          * 0xffff for the adapter ID, but nonzero for
 162                          * other registers.  */
 163
 164                         found = 1;
 165                 }
 166         }
 167         return found;
 168 }
 169
 170 static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
 171 {
 172         unsigned char byte;
 173         unsigned long flags;
 174
 175         if (reg < 0 || reg >= 8)
 176                 return 0;
 177
 178         spin_lock_irqsave(&mca_lock, flags);
 179         if (mca_dev->pos_register) {
 180                 /* Disable adapter setup, enable motherboard setup */
 181
 182                 outb_p(0, MCA_ADAPTER_SETUP_REG);
 183                 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
 184
 185                 byte = inb_p(MCA_POS_REG(reg));
 186                 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 187         } else {
 188
 189                 /* Make sure motherboard setup is off */
 190
 191                 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 192
 193                 /* Read the appropriate register */
 194
 195                 outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
 196                 byte = inb_p(MCA_POS_REG(reg));
 197                 outb_p(0, MCA_ADAPTER_SETUP_REG);
 198         }
 199         spin_unlock_irqrestore(&mca_lock, flags);
 200
 201         mca_dev->pos[reg] = byte;
 202
 203         return byte;
 204 }
 205
 206 static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
 207                              unsigned char byte)
 208 {
 209         unsigned long flags;
 210
 211         if (reg < 0 || reg >= 8)
 212                 return;
 213
 214         spin_lock_irqsave(&mca_lock, flags);
 215
 216         /* Make sure motherboard setup is off */
 217
 218         outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 219
 220         /* Read in the appropriate register */
 221
 222         outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
 223         outb_p(byte, MCA_POS_REG(reg));
 224         outb_p(0, MCA_ADAPTER_SETUP_REG);
 225
 226         spin_unlock_irqrestore(&mca_lock, flags);
 227
 228         /* Update the global register list, while we have the byte */
 229
 230         mca_dev->pos[reg] = byte;
 231
 232 }
 233
 234 /* for the primary MCA bus, we have identity transforms */
 235 static int mca_dummy_transform_irq(struct mca_device *mca_dev, int irq)
 236 {
 237         return irq;
 238 }
 239
 240 static int mca_dummy_transform_ioport(struct mca_device *mca_dev, int port)
 241 {
 242         return port;
 243 }
 244
 245 static void *mca_dummy_transform_memory(struct mca_device *mca_dev, void *mem)
 246 {
 247         return mem;
 248 }
 249
 250
 251 static int __init mca_init(void)
 252 {
 253         unsigned int i, j;
 254         struct mca_device *mca_dev;
 255         unsigned char pos[8];
 256         short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
 257         struct mca_bus *bus;
 258
 259         /*
 260          * WARNING: Be careful when making changes here. Putting an adapter
 261          * and the motherboard simultaneously into setup mode may result in
 262          * damage to chips (according to The Indispensible PC Hardware Book
 263          * by Hans-Peter Messmer). Also, we disable system interrupts (so
 264          * that we are not disturbed in the middle of this).
 265          */
 266
 267         /* Make sure the MCA bus is present */
 268
 269         if (mca_system_init()) {
 270                 printk(KERN_ERR "MCA bus system initialisation failed\n");
 271                 return -ENODEV;
 272         }
 273
 274         if (!MCA_bus)
 275                 return -ENODEV;
 276
 277         printk(KERN_INFO "Micro Channel bus detected.\n");
 278
 279         /* All MCA systems have at least a primary bus */
 280         bus = mca_attach_bus(MCA_PRIMARY_BUS);
 281         if (!bus)
 282                 goto out_nomem;
 283         bus->default_dma_mask = 0xffffffffLL;
 284         bus->f.mca_write_pos = mca_pc_write_pos;
 285         bus->f.mca_read_pos = mca_pc_read_pos;
 286         bus->f.mca_transform_irq = mca_dummy_transform_irq;
 287         bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
 288         bus->f.mca_transform_memory = mca_dummy_transform_memory;
 289
 290         /* get the motherboard device */
 291         mca_dev = kzalloc(sizeof(struct mca_device), GFP_KERNEL);
 292         if (unlikely(!mca_dev))
 293                 goto out_nomem;
 294
 295         /*
 296          * We do not expect many MCA interrupts during initialization,
 297          * but let us be safe:
 298          */
 299         spin_lock_irq(&mca_lock);
 300
 301         /* Make sure adapter setup is off */
 302
 303         outb_p(0, MCA_ADAPTER_SETUP_REG);
 304
 305         /* Read motherboard POS registers */
 306
 307         mca_dev->pos_register = 0x7f;
 308         outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
 309         mca_dev->name[0] = 0;
 310         mca_read_and_store_pos(mca_dev->pos);
 311         mca_configure_adapter_status(mca_dev);
 312         /* fake POS and slot for a motherboard */
 313         mca_dev->pos_id = MCA_MOTHERBOARD_POS;
 314         mca_dev->slot = MCA_MOTHERBOARD;
 315         mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 316
 317         mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
 318         if (unlikely(!mca_dev))
 319                 goto out_unlock_nomem;
 320
 321         /* Put motherboard into video setup mode, read integrated video
 322          * POS registers, and turn motherboard setup off.
 323          */
 324
 325         mca_dev->pos_register = 0xdf;
 326         outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
 327         mca_dev->name[0] = 0;
 328         mca_read_and_store_pos(mca_dev->pos);
 329         mca_configure_adapter_status(mca_dev);
 330         /* fake POS and slot for the integrated video */
 331         mca_dev->pos_id = MCA_INTEGVIDEO_POS;
 332         mca_dev->slot = MCA_INTEGVIDEO;
 333         mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 334
 335         /*
 336          * Put motherboard into scsi setup mode, read integrated scsi
 337          * POS registers, and turn motherboard setup off.
 338          *
 339          * It seems there are two possible SCSI registers. Martin says that
 340          * for the 56,57, 0xf7 is the one, but fails on the 76.
 341          * Alfredo (apena@vnet.ibm.com) says
 342          * 0xfd works on his machine. We'll try both of them. I figure it's
 343          * a good bet that only one could be valid at a time. This could
 344          * screw up though if one is used for something else on the other
 345          * machine.
 346          */
 347
 348         for (i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
 349                 outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
 350                 if (mca_read_and_store_pos(pos))
 351                         break;
 352         }
 353         if (which_scsi) {
 354                 /* found a scsi card */
 355                 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
 356                 if (unlikely(!mca_dev))
 357                         goto out_unlock_nomem;
 358
 359                 for (j = 0; j < 8; j++)
 360                         mca_dev->pos[j] = pos[j];
 361
 362                 mca_configure_adapter_status(mca_dev);
 363                 /* fake POS and slot for integrated SCSI controller */
 364                 mca_dev->pos_id = MCA_INTEGSCSI_POS;
 365                 mca_dev->slot = MCA_INTEGSCSI;
 366                 mca_dev->pos_register = which_scsi;
 367                 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 368         }
 369
 370         /* Turn off motherboard setup */
 371
 372         outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 373
 374         /*
 375          * Now loop over MCA slots: put each adapter into setup mode, and
 376          * read its POS registers. Then put adapter setup off.
 377          */
 378
 379         for (i = 0; i < MCA_MAX_SLOT_NR; i++) {
 380                 outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
 381                 if (!mca_read_and_store_pos(pos))
 382                         continue;
 383
 384                 mca_dev = kzalloc(sizeof(struct mca_device), GFP_ATOMIC);
 385                 if (unlikely(!mca_dev))
 386                         goto out_unlock_nomem;
 387
 388                 for (j = 0; j < 8; j++)
 389                         mca_dev->pos[j] = pos[j];
 390
 391                 mca_dev->driver_loaded = 0;
 392                 mca_dev->slot = i;
 393                 mca_dev->pos_register = 0;
 394                 mca_configure_adapter_status(mca_dev);
 395                 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 396         }
 397         outb_p(0, MCA_ADAPTER_SETUP_REG);
 398
 399         /* Enable interrupts and return memory start */
 400         spin_unlock_irq(&mca_lock);
 401
 402         for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
 403                 request_resource(&ioport_resource, mca_standard_resources + i);
 404
 405         mca_do_proc_init();
 406
 407         return 0;
 408
 409  out_unlock_nomem:
 410         spin_unlock_irq(&mca_lock);
 411  out_nomem:
 412         printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
 413         return -ENOMEM;
 414 }
 415
 416 subsys_initcall(mca_init);
 417
 418 /*--------------------------------------------------------------------*/
 419
 420 static __kprobes void
 421 mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
 422 {
 423         int slot = mca_dev->slot;
 424
 425         if (slot == MCA_INTEGSCSI) {
 426                 printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
 427                         mca_dev->name);
 428         } else if (slot == MCA_INTEGVIDEO) {
 429                 printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
 430                         mca_dev->name);
 431         } else if (slot == MCA_MOTHERBOARD) {
 432                 printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
 433                         mca_dev->name);
 434         }
 435
 436         /* More info available in POS 6 and 7? */
 437
 438         if (check_flag) {
 439                 unsigned char pos6, pos7;
 440
 441                 pos6 = mca_device_read_pos(mca_dev, 6);
 442                 pos7 = mca_device_read_pos(mca_dev, 7);
 443
 444                 printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
 445         }
 446
 447 } /* mca_handle_nmi_slot */
 448
 449 /*--------------------------------------------------------------------*/
 450
 451 static int __kprobes mca_handle_nmi_callback(struct device *dev, void *data)
 452 {
 453         struct mca_device *mca_dev = to_mca_device(dev);
 454         unsigned char pos5;
 455
 456         pos5 = mca_device_read_pos(mca_dev, 5);
 457
 458         if (!(pos5 & 0x80)) {
 459                 /*
 460                  *  Bit 7 of POS 5 is reset when this adapter has a hardware
 461                  * error. Bit 7 it reset if there's error information
 462                  * available in POS 6 and 7.
 463                  */
 464                 mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
 465                 return 1;
 466         }
 467         return 0;
 468 }
 469
 470 void __kprobes mca_handle_nmi(void)
 471 {
 472         /*
 473          *  First try - scan the various adapters and see if a specific
 474          * adapter was responsible for the error.
 475          */
 476         bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
 477 }