arch/i386/kernel/mca.c

   1 /*
   2  *  linux/arch/i386/kernel/mca.c
   3  *  Written by Martin Kolinek, February 1996
   4  *
   5  * Changes:
   6  *
   7  *      Chris Beauregard July 28th, 1996
   8  *      - Fixed up integrated SCSI detection
   9  *
  10  *      Chris Beauregard August 3rd, 1996
  11  *      - Made mca_info local
  12  *      - Made integrated registers accessible through standard function calls
  13  *      - Added name field
  14  *      - More sanity checking
  15  *
  16  *      Chris Beauregard August 9th, 1996
  17  *      - Rewrote /proc/mca
  18  *
  19  *      Chris Beauregard January 7th, 1997
  20  *      - Added basic NMI-processing
  21  *      - Added more information to mca_info structure
  22  *
  23  *      David Weinehall October 12th, 1998
  24  *      - Made a lot of cleaning up in the source
  25  *      - Added use of save_flags / restore_flags
  26  *      - Added the 'driver_loaded' flag in MCA_adapter
  27  *      - Added an alternative implemention of ZP Gu's mca_find_unused_adapter
  28  *
  29  *      David Weinehall March 24th, 1999
  30  *      - Fixed the output of 'Driver Installed' in /proc/mca/pos
  31  *      - Made the Integrated Video & SCSI show up even if they have id 0000
  32  *
  33  *      Alexander Viro November 9th, 1999
  34  *      - Switched to regular procfs methods
  35  *
  36  *      Alfred Arnold & David Weinehall August 23rd, 2000
  37  *      - Added support for Planar POS-registers
  38  */
  39
  40 #include <linux/module.h>
  41 #include <linux/types.h>
  42 #include <linux/errno.h>
  43 #include <linux/kernel.h>
  44 #include <linux/mca.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/config.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 #include <asm/arch_hooks.h>
  56
  57 static unsigned char which_scsi = 0;
  58
  59 int MCA_bus = 0;
  60 EXPORT_SYMBOL(MCA_bus);
  61
  62 /*
  63  * Motherboard register spinlock. Untested on SMP at the moment, but
  64  * are there any MCA SMP boxes?
  65  *
  66  * Yes - Alan
  67  */
  68 static DEFINE_SPINLOCK(mca_lock);
  69
  70 /* Build the status info for the adapter */
  71
  72 static void mca_configure_adapter_status(struct mca_device *mca_dev) {
  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                 /* id = 0x0000 usually indicates hardware failure,
  81                  * however, ZP Gu (zpg@castle.net> reports that his 9556
  82                  * has 0x0000 as id and everything still works. There
  83                  * also seem to be an adapter with id = 0x0000; the
  84                  * NCR Parallel Bus Memory Card. Until this is confirmed,
  85                  * however, this code will stay.
  86                  */
  87
  88                 mca_dev->status = MCA_ADAPTER_ERROR;
  89
  90                 return;
  91         } else if(mca_dev->pos_id != 0xffff) {
  92
  93                 /* 0xffff usually indicates that there's no adapter,
  94                  * however, some integrated adapters may have 0xffff as
  95                  * their id and still be valid. Examples are on-board
  96                  * VGA of the 55sx, the integrated SCSI of the 56 & 57,
  97                  * and possibly also the 95 ULTIMEDIA.
  98                  */
  99
 100                 mca_dev->status = MCA_ADAPTER_NORMAL;
 101         }
 102
 103         if((mca_dev->pos_id == 0xffff ||
 104             mca_dev->pos_id == 0x0000) && mca_dev->slot >= MCA_MAX_SLOT_NR) {
 105                 int j;
 106
 107                 for(j = 2; j < 8; j++) {
 108                         if(mca_dev->pos[j] != 0xff) {
 109                                 mca_dev->status = MCA_ADAPTER_NORMAL;
 110                                 break;
 111                         }
 112                 }
 113         }
 114
 115         if(!(mca_dev->pos[2] & MCA_ENABLED)) {
 116
 117                 /* enabled bit is in POS 2 */
 118
 119                 mca_dev->status = MCA_ADAPTER_DISABLED;
 120         }
 121 } /* mca_configure_adapter_status */
 122
 123 /*--------------------------------------------------------------------*/
 124
 125 static struct resource mca_standard_resources[] = {
 126         { .start = 0x60, .end = 0x60, .name = "system control port B (MCA)" },
 127         { .start = 0x90, .end = 0x90, .name = "arbitration (MCA)" },
 128         { .start = 0x91, .end = 0x91, .name = "card Select Feedback (MCA)" },
 129         { .start = 0x92, .end = 0x92, .name = "system Control port A (MCA)" },
 130         { .start = 0x94, .end = 0x94, .name = "system board setup (MCA)" },
 131         { .start = 0x96, .end = 0x97, .name = "POS (MCA)" },
 132         { .start = 0x100, .end = 0x107, .name = "POS (MCA)" }
 133 };
 134
 135 #define MCA_STANDARD_RESOURCES  (sizeof(mca_standard_resources)/sizeof(struct resource))
 136
 137 /**
 138  *      mca_read_and_store_pos - read the POS registers into a memory buffer
 139  *      @pos: a char pointer to 8 bytes, contains the POS register value on
 140  *            successful return
 141  *
 142  *      Returns 1 if a card actually exists (i.e. the pos isn't
 143  *      all 0xff) or 0 otherwise
 144  */
 145 static int mca_read_and_store_pos(unsigned char *pos) {
 146         int j;
 147         int found = 0;
 148
 149         for(j=0; j<8; j++) {
 150                 if((pos[j] = inb_p(MCA_POS_REG(j))) != 0xff) {
 151                         /* 0xff all across means no device. 0x00 means
 152                          * something's broken, but a device is
 153                          * probably there.  However, if you get 0x00
 154                          * from a motherboard register it won't matter
 155                          * what we find.  For the record, on the
 156                          * 57SLC, the integrated SCSI adapter has
 157                          * 0xffff for the adapter ID, but nonzero for
 158                          * other registers.  */
 159
 160                         found = 1;
 161                 }
 162         }
 163         return found;
 164 }
 165
 166 static unsigned char mca_pc_read_pos(struct mca_device *mca_dev, int reg)
 167 {
 168         unsigned char byte;
 169         unsigned long flags;
 170
 171         if(reg < 0 || reg >= 8)
 172                 return 0;
 173
 174         spin_lock_irqsave(&mca_lock, flags);
 175         if(mca_dev->pos_register) {
 176                 /* Disable adapter setup, enable motherboard setup */
 177
 178                 outb_p(0, MCA_ADAPTER_SETUP_REG);
 179                 outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
 180
 181                 byte = inb_p(MCA_POS_REG(reg));
 182                 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 183         } else {
 184
 185                 /* Make sure motherboard setup is off */
 186
 187                 outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 188
 189                 /* Read the appropriate register */
 190
 191                 outb_p(0x8|(mca_dev->slot & 0xf), MCA_ADAPTER_SETUP_REG);
 192                 byte = inb_p(MCA_POS_REG(reg));
 193                 outb_p(0, MCA_ADAPTER_SETUP_REG);
 194         }
 195         spin_unlock_irqrestore(&mca_lock, flags);
 196
 197         mca_dev->pos[reg] = byte;
 198
 199         return byte;
 200 }
 201
 202 static void mca_pc_write_pos(struct mca_device *mca_dev, int reg,
 203                              unsigned char byte)
 204 {
 205         unsigned long flags;
 206
 207         if(reg < 0 || reg >= 8)
 208                 return;
 209
 210         spin_lock_irqsave(&mca_lock, flags);
 211
 212         /* Make sure motherboard setup is off */
 213
 214         outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 215
 216         /* Read in the appropriate register */
 217
 218         outb_p(0x8|(mca_dev->slot&0xf), MCA_ADAPTER_SETUP_REG);
 219         outb_p(byte, MCA_POS_REG(reg));
 220         outb_p(0, MCA_ADAPTER_SETUP_REG);
 221
 222         spin_unlock_irqrestore(&mca_lock, flags);
 223
 224         /* Update the global register list, while we have the byte */
 225
 226         mca_dev->pos[reg] = byte;
 227
 228 }
 229
 230 /* for the primary MCA bus, we have identity transforms */
 231 static int mca_dummy_transform_irq(struct mca_device * mca_dev, int irq)
 232 {
 233         return irq;
 234 }
 235
 236 static int mca_dummy_transform_ioport(struct mca_device * mca_dev, int port)
 237 {
 238         return port;
 239 }
 240
 241 static void *mca_dummy_transform_memory(struct mca_device * mca_dev, void *mem)
 242 {
 243         return mem;
 244 }
 245
 246
 247 static int __init mca_init(void)
 248 {
 249         unsigned int i, j;
 250         struct mca_device *mca_dev;
 251         unsigned char pos[8];
 252         short mca_builtin_scsi_ports[] = {0xf7, 0xfd, 0x00};
 253         struct mca_bus *bus;
 254
 255         /* WARNING: Be careful when making changes here. Putting an adapter
 256          * and the motherboard simultaneously into setup mode may result in
 257          * damage to chips (according to The Indispensible PC Hardware Book
 258          * by Hans-Peter Messmer). Also, we disable system interrupts (so
 259          * that we are not disturbed in the middle of this).
 260          */
 261
 262         /* Make sure the MCA bus is present */
 263
 264         if (mca_system_init()) {
 265                 printk(KERN_ERR "MCA bus system initialisation failed\n");
 266                 return -ENODEV;
 267         }
 268
 269         if (!MCA_bus)
 270                 return -ENODEV;
 271
 272         printk(KERN_INFO "Micro Channel bus detected.\n");
 273
 274         /* All MCA systems have at least a primary bus */
 275         bus = mca_attach_bus(MCA_PRIMARY_BUS);
 276         if (!bus)
 277                 goto out_nomem;
 278         bus->default_dma_mask = 0xffffffffLL;
 279         bus->f.mca_write_pos = mca_pc_write_pos;
 280         bus->f.mca_read_pos = mca_pc_read_pos;
 281         bus->f.mca_transform_irq = mca_dummy_transform_irq;
 282         bus->f.mca_transform_ioport = mca_dummy_transform_ioport;
 283         bus->f.mca_transform_memory = mca_dummy_transform_memory;
 284
 285         /* get the motherboard device */
 286         mca_dev = kmalloc(sizeof(struct mca_device), GFP_KERNEL);
 287         if(unlikely(!mca_dev))
 288                 goto out_nomem;
 289         memset(mca_dev, 0, sizeof(struct mca_device));
 290
 291         /*
 292          * We do not expect many MCA interrupts during initialization,
 293          * but let us be safe:
 294          */
 295         spin_lock_irq(&mca_lock);
 296
 297         /* Make sure adapter setup is off */
 298
 299         outb_p(0, MCA_ADAPTER_SETUP_REG);
 300
 301         /* Read motherboard POS registers */
 302
 303         mca_dev->pos_register = 0x7f;
 304         outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
 305         mca_dev->name[0] = 0;
 306         mca_read_and_store_pos(mca_dev->pos);
 307         mca_configure_adapter_status(mca_dev);
 308         /* fake POS and slot for a motherboard */
 309         mca_dev->pos_id = MCA_MOTHERBOARD_POS;
 310         mca_dev->slot = MCA_MOTHERBOARD;
 311         mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 312
 313         mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
 314         if(unlikely(!mca_dev))
 315                 goto out_unlock_nomem;
 316         memset(mca_dev, 0, sizeof(struct mca_device));
 317
 318
 319         /* Put motherboard into video setup mode, read integrated video
 320          * POS registers, and turn motherboard setup off.
 321          */
 322
 323         mca_dev->pos_register = 0xdf;
 324         outb_p(mca_dev->pos_register, MCA_MOTHERBOARD_SETUP_REG);
 325         mca_dev->name[0] = 0;
 326         mca_read_and_store_pos(mca_dev->pos);
 327         mca_configure_adapter_status(mca_dev);
 328         /* fake POS and slot for the integrated video */
 329         mca_dev->pos_id = MCA_INTEGVIDEO_POS;
 330         mca_dev->slot = MCA_INTEGVIDEO;
 331         mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 332
 333         /* Put motherboard into scsi setup mode, read integrated scsi
 334          * POS registers, and turn motherboard setup off.
 335          *
 336          * It seems there are two possible SCSI registers. Martin says that
 337          * for the 56,57, 0xf7 is the one, but fails on the 76.
 338          * Alfredo (apena@vnet.ibm.com) says
 339          * 0xfd works on his machine. We'll try both of them. I figure it's
 340          * a good bet that only one could be valid at a time. This could
 341          * screw up though if one is used for something else on the other
 342          * machine.
 343          */
 344
 345         for(i = 0; (which_scsi = mca_builtin_scsi_ports[i]) != 0; i++) {
 346                 outb_p(which_scsi, MCA_MOTHERBOARD_SETUP_REG);
 347                 if(mca_read_and_store_pos(pos))
 348                         break;
 349         }
 350         if(which_scsi) {
 351                 /* found a scsi card */
 352                 mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
 353                 if(unlikely(!mca_dev))
 354                         goto out_unlock_nomem;
 355                 memset(mca_dev, 0, sizeof(struct mca_device));
 356
 357                 for(j = 0; j < 8; j++)
 358                         mca_dev->pos[j] = pos[j];
 359
 360                 mca_configure_adapter_status(mca_dev);
 361                 /* fake POS and slot for integrated SCSI controller */
 362                 mca_dev->pos_id = MCA_INTEGSCSI_POS;
 363                 mca_dev->slot = MCA_INTEGSCSI;
 364                 mca_dev->pos_register = which_scsi;
 365                 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 366         }
 367
 368         /* Turn off motherboard setup */
 369
 370         outb_p(0xff, MCA_MOTHERBOARD_SETUP_REG);
 371
 372         /* Now loop over MCA slots: put each adapter into setup mode, and
 373          * read its POS registers. Then put adapter setup off.
 374          */
 375
 376         for(i=0; i<MCA_MAX_SLOT_NR; i++) {
 377                 outb_p(0x8|(i&0xf), MCA_ADAPTER_SETUP_REG);
 378                 if(!mca_read_and_store_pos(pos))
 379                         continue;
 380
 381                 mca_dev = kmalloc(sizeof(struct mca_device), GFP_ATOMIC);
 382                 if(unlikely(!mca_dev))
 383                         goto out_unlock_nomem;
 384                 memset(mca_dev, 0, sizeof(struct mca_device));
 385
 386                 for(j=0; j<8; j++)
 387                         mca_dev->pos[j]=pos[j];
 388
 389                 mca_dev->driver_loaded = 0;
 390                 mca_dev->slot = i;
 391                 mca_dev->pos_register = 0;
 392                 mca_configure_adapter_status(mca_dev);
 393                 mca_register_device(MCA_PRIMARY_BUS, mca_dev);
 394         }
 395         outb_p(0, MCA_ADAPTER_SETUP_REG);
 396
 397         /* Enable interrupts and return memory start */
 398         spin_unlock_irq(&mca_lock);
 399
 400         for (i = 0; i < MCA_STANDARD_RESOURCES; i++)
 401                 request_resource(&ioport_resource, mca_standard_resources + i);
 402
 403         mca_do_proc_init();
 404
 405         return 0;
 406
 407  out_unlock_nomem:
 408         spin_unlock_irq(&mca_lock);
 409  out_nomem:
 410         printk(KERN_EMERG "Failed memory allocation in MCA setup!\n");
 411         return -ENOMEM;
 412 }
 413
 414 subsys_initcall(mca_init);
 415
 416 /*--------------------------------------------------------------------*/
 417
 418 static void mca_handle_nmi_device(struct mca_device *mca_dev, int check_flag)
 419 {
 420         int slot = mca_dev->slot;
 421
 422         if(slot == MCA_INTEGSCSI) {
 423                 printk(KERN_CRIT "NMI: caused by MCA integrated SCSI adapter (%s)\n",
 424                         mca_dev->name);
 425         } else if(slot == MCA_INTEGVIDEO) {
 426                 printk(KERN_CRIT "NMI: caused by MCA integrated video adapter (%s)\n",
 427                         mca_dev->name);
 428         } else if(slot == MCA_MOTHERBOARD) {
 429                 printk(KERN_CRIT "NMI: caused by motherboard (%s)\n",
 430                         mca_dev->name);
 431         }
 432
 433         /* More info available in POS 6 and 7? */
 434
 435         if(check_flag) {
 436                 unsigned char pos6, pos7;
 437
 438                 pos6 = mca_device_read_pos(mca_dev, 6);
 439                 pos7 = mca_device_read_pos(mca_dev, 7);
 440
 441                 printk(KERN_CRIT "NMI: POS 6 = 0x%x, POS 7 = 0x%x\n", pos6, pos7);
 442         }
 443
 444 } /* mca_handle_nmi_slot */
 445
 446 /*--------------------------------------------------------------------*/
 447
 448 static int mca_handle_nmi_callback(struct device *dev, void *data)
 449 {
 450         struct mca_device *mca_dev = to_mca_device(dev);
 451         unsigned char pos5;
 452
 453         pos5 = mca_device_read_pos(mca_dev, 5);
 454
 455         if(!(pos5 & 0x80)) {
 456                 /* Bit 7 of POS 5 is reset when this adapter has a hardware
 457                  * error. Bit 7 it reset if there's error information
 458                  * available in POS 6 and 7.
 459                  */
 460                 mca_handle_nmi_device(mca_dev, !(pos5 & 0x40));
 461                 return 1;
 462         }
 463         return 0;
 464 }
 465
 466 void mca_handle_nmi(void)
 467 {
 468         /* First try - scan the various adapters and see if a specific
 469          * adapter was responsible for the error.
 470          */
 471         bus_for_each_dev(&mca_bus_type, NULL, NULL, mca_handle_nmi_callback);
 472
 473         mca_nmi_hook();
 474 } /* mca_handle_nmi */