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