git.oblomov.eu Git - linux-2.6/blob - drivers/block/umem.c

   1 /*
   2  * mm.c - Micro Memory(tm) PCI memory board block device driver - v2.3
   3  *
   4  * (C) 2001 San Mehat <nettwerk@valinux.com>
   5  * (C) 2001 Johannes Erdfelt <jerdfelt@valinux.com>
   6  * (C) 2001 NeilBrown <neilb@cse.unsw.edu.au>
   7  *
   8  * This driver for the Micro Memory PCI Memory Module with Battery Backup
   9  * is Copyright Micro Memory Inc 2001-2002.  All rights reserved.
  10  *
  11  * This driver is released to the public under the terms of the
  12  *  GNU GENERAL PUBLIC LICENSE version 2
  13  * See the file COPYING for details.
  14  *
  15  * This driver provides a standard block device interface for Micro Memory(tm)
  16  * PCI based RAM boards.
  17  * 10/05/01: Phap Nguyen - Rebuilt the driver
  18  * 10/22/01: Phap Nguyen - v2.1 Added disk partitioning
  19  * 29oct2001:NeilBrown   - Use make_request_fn instead of request_fn
  20  *                       - use stand disk partitioning (so fdisk works).
  21  * 08nov2001:NeilBrown   - change driver name from "mm" to "umem"
  22  *                       - incorporate into main kernel
  23  * 08apr2002:NeilBrown   - Move some of interrupt handle to tasklet
  24  *                       - use spin_lock_bh instead of _irq
  25  *                       - Never block on make_request.  queue
  26  *                         bh's instead.
  27  *                       - unregister umem from devfs at mod unload
  28  *                       - Change version to 2.3
  29  * 07Nov2001:Phap Nguyen - Select pci read command: 06, 12, 15 (Decimal)
  30  * 07Jan2002: P. Nguyen  - Used PCI Memory Write & Invalidate for DMA
  31  * 15May2002:NeilBrown   - convert to bio for 2.5
  32  * 17May2002:NeilBrown   - remove init_mem initialisation.  Instead detect
  33  *                       - a sequence of writes that cover the card, and
  34  *                       - set initialised bit then.
  35  */
  36
  37 //#define DEBUG /* uncomment if you want debugging info (pr_debug) */
  38 #include <linux/fs.h>
  39 #include <linux/bio.h>
  40 #include <linux/kernel.h>
  41 #include <linux/mm.h>
  42 #include <linux/mman.h>
  43 #include <linux/ioctl.h>
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/timer.h>
  48 #include <linux/pci.h>
  49 #include <linux/slab.h>
  50 #include <linux/dma-mapping.h>
  51
  52 #include <linux/fcntl.h>        /* O_ACCMODE */
  53 #include <linux/hdreg.h>  /* HDIO_GETGEO */
  54
  55 #include <linux/umem.h>
  56
  57 #include <asm/uaccess.h>
  58 #include <asm/io.h>
  59
  60 #define MM_MAXCARDS 4
  61 #define MM_RAHEAD 2      /* two sectors */
  62 #define MM_BLKSIZE 1024  /* 1k blocks */
  63 #define MM_HARDSECT 512  /* 512-byte hardware sectors */
  64 #define MM_SHIFT 6       /* max 64 partitions on 4 cards  */
  65
  66 /*
  67  * Version Information
  68  */
  69
  70 #define DRIVER_VERSION "v2.3"
  71 #define DRIVER_AUTHOR "San Mehat, Johannes Erdfelt, NeilBrown"
  72 #define DRIVER_DESC "Micro Memory(tm) PCI memory board block driver"
  73
  74 static int debug;
  75 /* #define HW_TRACE(x)     writeb(x,cards[0].csr_remap + MEMCTRLSTATUS_MAGIC) */
  76 #define HW_TRACE(x)
  77
  78 #define DEBUG_LED_ON_TRANSFER   0x01
  79 #define DEBUG_BATTERY_POLLING   0x02
  80
  81 module_param(debug, int, 0644);
  82 MODULE_PARM_DESC(debug, "Debug bitmask");
  83
  84 static int pci_read_cmd = 0x0C;         /* Read Multiple */
  85 module_param(pci_read_cmd, int, 0);
  86 MODULE_PARM_DESC(pci_read_cmd, "PCI read command");
  87
  88 static int pci_write_cmd = 0x0F;        /* Write and Invalidate */
  89 module_param(pci_write_cmd, int, 0);
  90 MODULE_PARM_DESC(pci_write_cmd, "PCI write command");
  91
  92 static int pci_cmds;
  93
  94 static int major_nr;
  95
  96 #include <linux/blkdev.h>
  97 #include <linux/blkpg.h>
  98
  99 struct cardinfo {
 100         int             card_number;
 101         struct pci_dev  *dev;
 102
 103         int             irq;
 104
 105         unsigned long   csr_base;
 106         unsigned char   __iomem *csr_remap;
 107         unsigned long   csr_len;
 108         unsigned int    win_size; /* PCI window size */
 109         unsigned int    mm_size;  /* size in kbytes */
 110
 111         unsigned int    init_size; /* initial segment, in sectors,
 112                                     * that we know to
 113                                     * have been written
 114                                     */
 115         struct bio      *bio, *currentbio, **biotail;
 116
 117         request_queue_t *queue;
 118
 119         struct mm_page {
 120                 dma_addr_t              page_dma;
 121                 struct mm_dma_desc      *desc;
 122                 int                     cnt, headcnt;
 123                 struct bio              *bio, **biotail;
 124         } mm_pages[2];
 125 #define DESC_PER_PAGE ((PAGE_SIZE*2)/sizeof(struct mm_dma_desc))
 126
 127         int  Active, Ready;
 128
 129         struct tasklet_struct   tasklet;
 130         unsigned int dma_status;
 131
 132         struct {
 133                 int             good;
 134                 int             warned;
 135                 unsigned long   last_change;
 136         } battery[2];
 137
 138         spinlock_t      lock;
 139         int             check_batteries;
 140
 141         int             flags;
 142 };
 143
 144 static struct cardinfo cards[MM_MAXCARDS];
 145 static struct block_device_operations mm_fops;
 146 static struct timer_list battery_timer;
 147
 148 static int num_cards = 0;
 149
 150 static struct gendisk *mm_gendisk[MM_MAXCARDS];
 151
 152 static void check_batteries(struct cardinfo *card);
 153
 154 /*
 155 -----------------------------------------------------------------------------------
 156 --                           get_userbit
 157 -----------------------------------------------------------------------------------
 158 */
 159 static int get_userbit(struct cardinfo *card, int bit)
 160 {
 161         unsigned char led;
 162
 163         led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
 164         return led & bit;
 165 }
 166 /*
 167 -----------------------------------------------------------------------------------
 168 --                            set_userbit
 169 -----------------------------------------------------------------------------------
 170 */
 171 static int set_userbit(struct cardinfo *card, int bit, unsigned char state)
 172 {
 173         unsigned char led;
 174
 175         led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
 176         if (state)
 177                 led |= bit;
 178         else
 179                 led &= ~bit;
 180         writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
 181
 182         return 0;
 183 }
 184 /*
 185 -----------------------------------------------------------------------------------
 186 --                             set_led
 187 -----------------------------------------------------------------------------------
 188 */
 189 /*
 190  * NOTE: For the power LED, use the LED_POWER_* macros since they differ
 191  */
 192 static void set_led(struct cardinfo *card, int shift, unsigned char state)
 193 {
 194         unsigned char led;
 195
 196         led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
 197         if (state == LED_FLIP)
 198                 led ^= (1<<shift);
 199         else {
 200                 led &= ~(0x03 << shift);
 201                 led |= (state << shift);
 202         }
 203         writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
 204
 205 }
 206
 207 #ifdef MM_DIAG
 208 /*
 209 -----------------------------------------------------------------------------------
 210 --                              dump_regs
 211 -----------------------------------------------------------------------------------
 212 */
 213 static void dump_regs(struct cardinfo *card)
 214 {
 215         unsigned char *p;
 216         int i, i1;
 217
 218         p = card->csr_remap;
 219         for (i = 0; i < 8; i++) {
 220                 printk(KERN_DEBUG "%p   ", p);
 221
 222                 for (i1 = 0; i1 < 16; i1++)
 223                         printk("%02x ", *p++);
 224
 225                 printk("\n");
 226         }
 227 }
 228 #endif
 229 /*
 230 -----------------------------------------------------------------------------------
 231 --                            dump_dmastat
 232 -----------------------------------------------------------------------------------
 233 */
 234 static void dump_dmastat(struct cardinfo *card, unsigned int dmastat)
 235 {
 236         printk(KERN_DEBUG "MM%d*: DMAstat - ", card->card_number);
 237         if (dmastat & DMASCR_ANY_ERR)
 238                 printk("ANY_ERR ");
 239         if (dmastat & DMASCR_MBE_ERR)
 240                 printk("MBE_ERR ");
 241         if (dmastat & DMASCR_PARITY_ERR_REP)
 242                 printk("PARITY_ERR_REP ");
 243         if (dmastat & DMASCR_PARITY_ERR_DET)
 244                 printk("PARITY_ERR_DET ");
 245         if (dmastat & DMASCR_SYSTEM_ERR_SIG)
 246                 printk("SYSTEM_ERR_SIG ");
 247         if (dmastat & DMASCR_TARGET_ABT)
 248                 printk("TARGET_ABT ");
 249         if (dmastat & DMASCR_MASTER_ABT)
 250                 printk("MASTER_ABT ");
 251         if (dmastat & DMASCR_CHAIN_COMPLETE)
 252                 printk("CHAIN_COMPLETE ");
 253         if (dmastat & DMASCR_DMA_COMPLETE)
 254                 printk("DMA_COMPLETE ");
 255         printk("\n");
 256 }
 257
 258 /*
 259  * Theory of request handling
 260  *
 261  * Each bio is assigned to one mm_dma_desc - which may not be enough FIXME
 262  * We have two pages of mm_dma_desc, holding about 64 descriptors
 263  * each.  These are allocated at init time.
 264  * One page is "Ready" and is either full, or can have request added.
 265  * The other page might be "Active", which DMA is happening on it.
 266  *
 267  * Whenever IO on the active page completes, the Ready page is activated
 268  * and the ex-Active page is clean out and made Ready.
 269  * Otherwise the Ready page is only activated when it becomes full, or
 270  * when mm_unplug_device is called via the unplug_io_fn.
 271  *
 272  * If a request arrives while both pages a full, it is queued, and b_rdev is
 273  * overloaded to record whether it was a read or a write.
 274  *
 275  * The interrupt handler only polls the device to clear the interrupt.
 276  * The processing of the result is done in a tasklet.
 277  */
 278
 279 static void mm_start_io(struct cardinfo *card)
 280 {
 281         /* we have the lock, we know there is
 282          * no IO active, and we know that card->Active
 283          * is set
 284          */
 285         struct mm_dma_desc *desc;
 286         struct mm_page *page;
 287         int offset;
 288
 289         /* make the last descriptor end the chain */
 290         page = &card->mm_pages[card->Active];
 291         pr_debug("start_io: %d %d->%d\n", card->Active, page->headcnt, page->cnt-1);
 292         desc = &page->desc[page->cnt-1];
 293
 294         desc->control_bits |= cpu_to_le32(DMASCR_CHAIN_COMP_EN);
 295         desc->control_bits &= ~cpu_to_le32(DMASCR_CHAIN_EN);
 296         desc->sem_control_bits = desc->control_bits;
 297
 298
 299         if (debug & DEBUG_LED_ON_TRANSFER)
 300                 set_led(card, LED_REMOVE, LED_ON);
 301
 302         desc = &page->desc[page->headcnt];
 303         writel(0, card->csr_remap + DMA_PCI_ADDR);
 304         writel(0, card->csr_remap + DMA_PCI_ADDR + 4);
 305
 306         writel(0, card->csr_remap + DMA_LOCAL_ADDR);
 307         writel(0, card->csr_remap + DMA_LOCAL_ADDR + 4);
 308
 309         writel(0, card->csr_remap + DMA_TRANSFER_SIZE);
 310         writel(0, card->csr_remap + DMA_TRANSFER_SIZE + 4);
 311
 312         writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR);
 313         writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR + 4);
 314
 315         offset = ((char*)desc) - ((char*)page->desc);
 316         writel(cpu_to_le32((page->page_dma+offset)&0xffffffff),
 317                card->csr_remap + DMA_DESCRIPTOR_ADDR);
 318         /* Force the value to u64 before shifting otherwise >> 32 is undefined C
 319          * and on some ports will do nothing ! */
 320         writel(cpu_to_le32(((u64)page->page_dma)>>32),
 321                card->csr_remap + DMA_DESCRIPTOR_ADDR + 4);
 322
 323         /* Go, go, go */
 324         writel(cpu_to_le32(DMASCR_GO | DMASCR_CHAIN_EN | pci_cmds),
 325                card->csr_remap + DMA_STATUS_CTRL);
 326 }
 327
 328 static int add_bio(struct cardinfo *card);
 329
 330 static void activate(struct cardinfo *card)
 331 {
 332         /* if No page is Active, and Ready is
 333          * not empty, then switch Ready page
 334          * to active and start IO.
 335          * Then add any bh's that are available to Ready
 336          */
 337
 338         do {
 339                 while (add_bio(card))
 340                         ;
 341
 342                 if (card->Active == -1 &&
 343                     card->mm_pages[card->Ready].cnt > 0) {
 344                         card->Active = card->Ready;
 345                         card->Ready = 1-card->Ready;
 346                         mm_start_io(card);
 347                 }
 348
 349         } while (card->Active == -1 && add_bio(card));
 350 }
 351
 352 static inline void reset_page(struct mm_page *page)
 353 {
 354         page->cnt = 0;
 355         page->headcnt = 0;
 356         page->bio = NULL;
 357         page->biotail = & page->bio;
 358 }
 359
 360 static void mm_unplug_device(request_queue_t *q)
 361 {
 362         struct cardinfo *card = q->queuedata;
 363         unsigned long flags;
 364
 365         spin_lock_irqsave(&card->lock, flags);
 366         if (blk_remove_plug(q))
 367                 activate(card);
 368         spin_unlock_irqrestore(&card->lock, flags);
 369 }
 370
 371 /*
 372  * If there is room on Ready page, take
 373  * one bh off list and add it.
 374  * return 1 if there was room, else 0.
 375  */
 376 static int add_bio(struct cardinfo *card)
 377 {
 378         struct mm_page *p;
 379         struct mm_dma_desc *desc;
 380         dma_addr_t dma_handle;
 381         int offset;
 382         struct bio *bio;
 383         int rw;
 384         int len;
 385
 386         bio = card->currentbio;
 387         if (!bio && card->bio) {
 388                 card->currentbio = card->bio;
 389                 card->bio = card->bio->bi_next;
 390                 if (card->bio == NULL)
 391                         card->biotail = &card->bio;
 392                 card->currentbio->bi_next = NULL;
 393                 return 1;
 394         }
 395         if (!bio)
 396                 return 0;
 397
 398         rw = bio_rw(bio);
 399         if (card->mm_pages[card->Ready].cnt >= DESC_PER_PAGE)
 400                 return 0;
 401
 402         len = bio_iovec(bio)->bv_len;
 403         dma_handle = pci_map_page(card->dev,
 404                                   bio_page(bio),
 405                                   bio_offset(bio),
 406                                   len,
 407                                   (rw==READ) ?
 408                                   PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
 409
 410         p = &card->mm_pages[card->Ready];
 411         desc = &p->desc[p->cnt];
 412         p->cnt++;
 413         if ((p->biotail) != &bio->bi_next) {
 414                 *(p->biotail) = bio;
 415                 p->biotail = &(bio->bi_next);
 416                 bio->bi_next = NULL;
 417         }
 418
 419         desc->data_dma_handle = dma_handle;
 420
 421         desc->pci_addr = cpu_to_le64((u64)desc->data_dma_handle);
 422         desc->local_addr= cpu_to_le64(bio->bi_sector << 9);
 423         desc->transfer_size = cpu_to_le32(len);
 424         offset = ( ((char*)&desc->sem_control_bits) - ((char*)p->desc));
 425         desc->sem_addr = cpu_to_le64((u64)(p->page_dma+offset));
 426         desc->zero1 = desc->zero2 = 0;
 427         offset = ( ((char*)(desc+1)) - ((char*)p->desc));
 428         desc->next_desc_addr = cpu_to_le64(p->page_dma+offset);
 429         desc->control_bits = cpu_to_le32(DMASCR_GO|DMASCR_ERR_INT_EN|
 430                                          DMASCR_PARITY_INT_EN|
 431                                          DMASCR_CHAIN_EN |
 432                                          DMASCR_SEM_EN |
 433                                          pci_cmds);
 434         if (rw == WRITE)
 435                 desc->control_bits |= cpu_to_le32(DMASCR_TRANSFER_READ);
 436         desc->sem_control_bits = desc->control_bits;
 437
 438         bio->bi_sector += (len>>9);
 439         bio->bi_size -= len;
 440         bio->bi_idx++;
 441         if (bio->bi_idx >= bio->bi_vcnt)
 442                 card->currentbio = NULL;
 443
 444         return 1;
 445 }
 446
 447 static void process_page(unsigned long data)
 448 {
 449         /* check if any of the requests in the page are DMA_COMPLETE,
 450          * and deal with them appropriately.
 451          * If we find a descriptor without DMA_COMPLETE in the semaphore, then
 452          * dma must have hit an error on that descriptor, so use dma_status instead
 453          * and assume that all following descriptors must be re-tried.
 454          */
 455         struct mm_page *page;
 456         struct bio *return_bio=NULL;
 457         struct cardinfo *card = (struct cardinfo *)data;
 458         unsigned int dma_status = card->dma_status;
 459
 460         spin_lock_bh(&card->lock);
 461         if (card->Active < 0)
 462                 goto out_unlock;
 463         page = &card->mm_pages[card->Active];
 464
 465         while (page->headcnt < page->cnt) {
 466                 struct bio *bio = page->bio;
 467                 struct mm_dma_desc *desc = &page->desc[page->headcnt];
 468                 int control = le32_to_cpu(desc->sem_control_bits);
 469                 int last=0;
 470                 int idx;
 471
 472                 if (!(control & DMASCR_DMA_COMPLETE)) {
 473                         control = dma_status;
 474                         last=1;
 475                 }
 476                 page->headcnt++;
 477                 idx = bio->bi_phys_segments;
 478                 bio->bi_phys_segments++;
 479                 if (bio->bi_phys_segments >= bio->bi_vcnt)
 480                         page->bio = bio->bi_next;
 481
 482                 pci_unmap_page(card->dev, desc->data_dma_handle,
 483                                bio_iovec_idx(bio,idx)->bv_len,
 484                                  (control& DMASCR_TRANSFER_READ) ?
 485                                 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 486                 if (control & DMASCR_HARD_ERROR) {
 487                         /* error */
 488                         clear_bit(BIO_UPTODATE, &bio->bi_flags);
 489                         printk(KERN_WARNING "MM%d: I/O error on sector %d/%d\n",
 490                                card->card_number,
 491                                le32_to_cpu(desc->local_addr)>>9,
 492                                le32_to_cpu(desc->transfer_size));
 493                         dump_dmastat(card, control);
 494                 } else if (test_bit(BIO_RW, &bio->bi_rw) &&
 495                            le32_to_cpu(desc->local_addr)>>9 == card->init_size) {
 496                         card->init_size += le32_to_cpu(desc->transfer_size)>>9;
 497                         if (card->init_size>>1 >= card->mm_size) {
 498                                 printk(KERN_INFO "MM%d: memory now initialised\n",
 499                                        card->card_number);
 500                                 set_userbit(card, MEMORY_INITIALIZED, 1);
 501                         }
 502                 }
 503                 if (bio != page->bio) {
 504                         bio->bi_next = return_bio;
 505                         return_bio = bio;
 506                 }
 507
 508                 if (last) break;
 509         }
 510
 511         if (debug & DEBUG_LED_ON_TRANSFER)
 512                 set_led(card, LED_REMOVE, LED_OFF);
 513
 514         if (card->check_batteries) {
 515                 card->check_batteries = 0;
 516                 check_batteries(card);
 517         }
 518         if (page->headcnt >= page->cnt) {
 519                 reset_page(page);
 520                 card->Active = -1;
 521                 activate(card);
 522         } else {
 523                 /* haven't finished with this one yet */
 524                 pr_debug("do some more\n");
 525                 mm_start_io(card);
 526         }
 527  out_unlock:
 528         spin_unlock_bh(&card->lock);
 529
 530         while(return_bio) {
 531                 struct bio *bio = return_bio;
 532
 533                 return_bio = bio->bi_next;
 534                 bio->bi_next = NULL;
 535                 bio_endio(bio, bio->bi_size, 0);
 536         }
 537 }
 538
 539 /*
 540 -----------------------------------------------------------------------------------
 541 --                              mm_make_request
 542 -----------------------------------------------------------------------------------
 543 */
 544 static int mm_make_request(request_queue_t *q, struct bio *bio)
 545 {
 546         struct cardinfo *card = q->queuedata;
 547         pr_debug("mm_make_request %llu %u\n",
 548                  (unsigned long long)bio->bi_sector, bio->bi_size);
 549
 550         bio->bi_phys_segments = bio->bi_idx; /* count of completed segments*/
 551         spin_lock_irq(&card->lock);
 552         *card->biotail = bio;
 553         bio->bi_next = NULL;
 554         card->biotail = &bio->bi_next;
 555         blk_plug_device(q);
 556         spin_unlock_irq(&card->lock);
 557
 558         return 0;
 559 }
 560
 561 /*
 562 -----------------------------------------------------------------------------------
 563 --                              mm_interrupt
 564 -----------------------------------------------------------------------------------
 565 */
 566 static irqreturn_t mm_interrupt(int irq, void *__card)
 567 {
 568         struct cardinfo *card = (struct cardinfo *) __card;
 569         unsigned int dma_status;
 570         unsigned short cfg_status;
 571
 572 HW_TRACE(0x30);
 573
 574         dma_status = le32_to_cpu(readl(card->csr_remap + DMA_STATUS_CTRL));
 575
 576         if (!(dma_status & (DMASCR_ERROR_MASK | DMASCR_CHAIN_COMPLETE))) {
 577                 /* interrupt wasn't for me ... */
 578                 return IRQ_NONE;
 579         }
 580
 581         /* clear COMPLETION interrupts */
 582         if (card->flags & UM_FLAG_NO_BYTE_STATUS)
 583                 writel(cpu_to_le32(DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE),
 584                        card->csr_remap+ DMA_STATUS_CTRL);
 585         else
 586                 writeb((DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE) >> 16,
 587                        card->csr_remap+ DMA_STATUS_CTRL + 2);
 588
 589         /* log errors and clear interrupt status */
 590         if (dma_status & DMASCR_ANY_ERR) {
 591                 unsigned int    data_log1, data_log2;
 592                 unsigned int    addr_log1, addr_log2;
 593                 unsigned char   stat, count, syndrome, check;
 594
 595                 stat = readb(card->csr_remap + MEMCTRLCMD_ERRSTATUS);
 596
 597                 data_log1 = le32_to_cpu(readl(card->csr_remap + ERROR_DATA_LOG));
 598                 data_log2 = le32_to_cpu(readl(card->csr_remap + ERROR_DATA_LOG + 4));
 599                 addr_log1 = le32_to_cpu(readl(card->csr_remap + ERROR_ADDR_LOG));
 600                 addr_log2 = readb(card->csr_remap + ERROR_ADDR_LOG + 4);
 601
 602                 count = readb(card->csr_remap + ERROR_COUNT);
 603                 syndrome = readb(card->csr_remap + ERROR_SYNDROME);
 604                 check = readb(card->csr_remap + ERROR_CHECK);
 605
 606                 dump_dmastat(card, dma_status);
 607
 608                 if (stat & 0x01)
 609                         printk(KERN_ERR "MM%d*: Memory access error detected (err count %d)\n",
 610                                 card->card_number, count);
 611                 if (stat & 0x02)
 612                         printk(KERN_ERR "MM%d*: Multi-bit EDC error\n",
 613                                 card->card_number);
 614
 615                 printk(KERN_ERR "MM%d*: Fault Address 0x%02x%08x, Fault Data 0x%08x%08x\n",
 616                         card->card_number, addr_log2, addr_log1, data_log2, data_log1);
 617                 printk(KERN_ERR "MM%d*: Fault Check 0x%02x, Fault Syndrome 0x%02x\n",
 618                         card->card_number, check, syndrome);
 619
 620                 writeb(0, card->csr_remap + ERROR_COUNT);
 621         }
 622
 623         if (dma_status & DMASCR_PARITY_ERR_REP) {
 624                 printk(KERN_ERR "MM%d*: PARITY ERROR REPORTED\n", card->card_number);
 625                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 626                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 627         }
 628
 629         if (dma_status & DMASCR_PARITY_ERR_DET) {
 630                 printk(KERN_ERR "MM%d*: PARITY ERROR DETECTED\n", card->card_number);
 631                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 632                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 633         }
 634
 635         if (dma_status & DMASCR_SYSTEM_ERR_SIG) {
 636                 printk(KERN_ERR "MM%d*: SYSTEM ERROR\n", card->card_number);
 637                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 638                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 639         }
 640
 641         if (dma_status & DMASCR_TARGET_ABT) {
 642                 printk(KERN_ERR "MM%d*: TARGET ABORT\n", card->card_number);
 643                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 644                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 645         }
 646
 647         if (dma_status & DMASCR_MASTER_ABT) {
 648                 printk(KERN_ERR "MM%d*: MASTER ABORT\n", card->card_number);
 649                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 650                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 651         }
 652
 653         /* and process the DMA descriptors */
 654         card->dma_status = dma_status;
 655         tasklet_schedule(&card->tasklet);
 656
 657 HW_TRACE(0x36);
 658
 659         return IRQ_HANDLED;
 660 }
 661 /*
 662 -----------------------------------------------------------------------------------
 663 --                         set_fault_to_battery_status
 664 -----------------------------------------------------------------------------------
 665 */
 666 /*
 667  * If both batteries are good, no LED
 668  * If either battery has been warned, solid LED
 669  * If both batteries are bad, flash the LED quickly
 670  * If either battery is bad, flash the LED semi quickly
 671  */
 672 static void set_fault_to_battery_status(struct cardinfo *card)
 673 {
 674         if (card->battery[0].good && card->battery[1].good)
 675                 set_led(card, LED_FAULT, LED_OFF);
 676         else if (card->battery[0].warned || card->battery[1].warned)
 677                 set_led(card, LED_FAULT, LED_ON);
 678         else if (!card->battery[0].good && !card->battery[1].good)
 679                 set_led(card, LED_FAULT, LED_FLASH_7_0);
 680         else
 681                 set_led(card, LED_FAULT, LED_FLASH_3_5);
 682 }
 683
 684 static void init_battery_timer(void);
 685
 686
 687 /*
 688 -----------------------------------------------------------------------------------
 689 --                            check_battery
 690 -----------------------------------------------------------------------------------
 691 */
 692 static int check_battery(struct cardinfo *card, int battery, int status)
 693 {
 694         if (status != card->battery[battery].good) {
 695                 card->battery[battery].good = !card->battery[battery].good;
 696                 card->battery[battery].last_change = jiffies;
 697
 698                 if (card->battery[battery].good) {
 699                         printk(KERN_ERR "MM%d: Battery %d now good\n",
 700                                 card->card_number, battery + 1);
 701                         card->battery[battery].warned = 0;
 702                 } else
 703                         printk(KERN_ERR "MM%d: Battery %d now FAILED\n",
 704                                 card->card_number, battery + 1);
 705
 706                 return 1;
 707         } else if (!card->battery[battery].good &&
 708                    !card->battery[battery].warned &&
 709                    time_after_eq(jiffies, card->battery[battery].last_change +
 710                                  (HZ * 60 * 60 * 5))) {
 711                 printk(KERN_ERR "MM%d: Battery %d still FAILED after 5 hours\n",
 712                         card->card_number, battery + 1);
 713                 card->battery[battery].warned = 1;
 714
 715                 return 1;
 716         }
 717
 718         return 0;
 719 }
 720 /*
 721 -----------------------------------------------------------------------------------
 722 --                              check_batteries
 723 -----------------------------------------------------------------------------------
 724 */
 725 static void check_batteries(struct cardinfo *card)
 726 {
 727         /* NOTE: this must *never* be called while the card
 728          * is doing (bus-to-card) DMA, or you will need the
 729          * reset switch
 730          */
 731         unsigned char status;
 732         int ret1, ret2;
 733
 734         status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
 735         if (debug & DEBUG_BATTERY_POLLING)
 736                 printk(KERN_DEBUG "MM%d: checking battery status, 1 = %s, 2 = %s\n",
 737                        card->card_number,
 738                        (status & BATTERY_1_FAILURE) ? "FAILURE" : "OK",
 739                        (status & BATTERY_2_FAILURE) ? "FAILURE" : "OK");
 740
 741         ret1 = check_battery(card, 0, !(status & BATTERY_1_FAILURE));
 742         ret2 = check_battery(card, 1, !(status & BATTERY_2_FAILURE));
 743
 744         if (ret1 || ret2)
 745                 set_fault_to_battery_status(card);
 746 }
 747
 748 static void check_all_batteries(unsigned long ptr)
 749 {
 750         int i;
 751
 752         for (i = 0; i < num_cards; i++)
 753                 if (!(cards[i].flags & UM_FLAG_NO_BATT)) {
 754                         struct cardinfo *card = &cards[i];
 755                         spin_lock_bh(&card->lock);
 756                         if (card->Active >= 0)
 757                                 card->check_batteries = 1;
 758                         else
 759                                 check_batteries(card);
 760                         spin_unlock_bh(&card->lock);
 761                 }
 762
 763         init_battery_timer();
 764 }
 765 /*
 766 -----------------------------------------------------------------------------------
 767 --                            init_battery_timer
 768 -----------------------------------------------------------------------------------
 769 */
 770 static void init_battery_timer(void)
 771 {
 772         init_timer(&battery_timer);
 773         battery_timer.function = check_all_batteries;
 774         battery_timer.expires = jiffies + (HZ * 60);
 775         add_timer(&battery_timer);
 776 }
 777 /*
 778 -----------------------------------------------------------------------------------
 779 --                              del_battery_timer
 780 -----------------------------------------------------------------------------------
 781 */
 782 static void del_battery_timer(void)
 783 {
 784         del_timer(&battery_timer);
 785 }
 786 /*
 787 -----------------------------------------------------------------------------------
 788 --                                mm_revalidate
 789 -----------------------------------------------------------------------------------
 790 */
 791 /*
 792  * Note no locks taken out here.  In a worst case scenario, we could drop
 793  * a chunk of system memory.  But that should never happen, since validation
 794  * happens at open or mount time, when locks are held.
 795  *
 796  *      That's crap, since doing that while some partitions are opened
 797  * or mounted will give you really nasty results.
 798  */
 799 static int mm_revalidate(struct gendisk *disk)
 800 {
 801         struct cardinfo *card = disk->private_data;
 802         set_capacity(disk, card->mm_size << 1);
 803         return 0;
 804 }
 805
 806 static int mm_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 807 {
 808         struct cardinfo *card = bdev->bd_disk->private_data;
 809         int size = card->mm_size * (1024 / MM_HARDSECT);
 810
 811         /*
 812          * get geometry: we have to fake one...  trim the size to a
 813          * multiple of 2048 (1M): tell we have 32 sectors, 64 heads,
 814          * whatever cylinders.
 815          */
 816         geo->heads     = 64;
 817         geo->sectors   = 32;
 818         geo->cylinders = size / (geo->heads * geo->sectors);
 819         return 0;
 820 }
 821
 822 /*
 823 -----------------------------------------------------------------------------------
 824 --                                mm_check_change
 825 -----------------------------------------------------------------------------------
 826   Future support for removable devices
 827 */
 828 static int mm_check_change(struct gendisk *disk)
 829 {
 830 /*  struct cardinfo *dev = disk->private_data; */
 831         return 0;
 832 }
 833 /*
 834 -----------------------------------------------------------------------------------
 835 --                             mm_fops
 836 -----------------------------------------------------------------------------------
 837 */
 838 static struct block_device_operations mm_fops = {
 839         .owner          = THIS_MODULE,
 840         .getgeo         = mm_getgeo,
 841         .revalidate_disk= mm_revalidate,
 842         .media_changed  = mm_check_change,
 843 };
 844 /*
 845 -----------------------------------------------------------------------------------
 846 --                                mm_pci_probe
 847 -----------------------------------------------------------------------------------
 848 */
 849 static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 850 {
 851         int ret = -ENODEV;
 852         struct cardinfo *card = &cards[num_cards];
 853         unsigned char   mem_present;
 854         unsigned char   batt_status;
 855         unsigned int    saved_bar, data;
 856         int             magic_number;
 857
 858         if (pci_enable_device(dev) < 0)
 859                 return -ENODEV;
 860
 861         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xF8);
 862         pci_set_master(dev);
 863
 864         card->dev         = dev;
 865         card->card_number = num_cards;
 866
 867         card->csr_base = pci_resource_start(dev, 0);
 868         card->csr_len  = pci_resource_len(dev, 0);
 869
 870         printk(KERN_INFO "Micro Memory(tm) controller #%d found at %02x:%02x (PCI Mem Module (Battery Backup))\n",
 871                card->card_number, dev->bus->number, dev->devfn);
 872
 873         if (pci_set_dma_mask(dev, DMA_64BIT_MASK) &&
 874             pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
 875                 printk(KERN_WARNING "MM%d: NO suitable DMA found\n",num_cards);
 876                 return  -ENOMEM;
 877         }
 878         if (!request_mem_region(card->csr_base, card->csr_len, "Micro Memory")) {
 879                 printk(KERN_ERR "MM%d: Unable to request memory region\n", card->card_number);
 880                 ret = -ENOMEM;
 881
 882                 goto failed_req_csr;
 883         }
 884
 885         card->csr_remap = ioremap_nocache(card->csr_base, card->csr_len);
 886         if (!card->csr_remap) {
 887                 printk(KERN_ERR "MM%d: Unable to remap memory region\n", card->card_number);
 888                 ret = -ENOMEM;
 889
 890                 goto failed_remap_csr;
 891         }
 892
 893         printk(KERN_INFO "MM%d: CSR 0x%08lx -> 0x%p (0x%lx)\n", card->card_number,
 894                card->csr_base, card->csr_remap, card->csr_len);
 895
 896         switch(card->dev->device) {
 897         case 0x5415:
 898                 card->flags |= UM_FLAG_NO_BYTE_STATUS | UM_FLAG_NO_BATTREG;
 899                 magic_number = 0x59;
 900                 break;
 901
 902         case 0x5425:
 903                 card->flags |= UM_FLAG_NO_BYTE_STATUS;
 904                 magic_number = 0x5C;
 905                 break;
 906
 907         case 0x6155:
 908                 card->flags |= UM_FLAG_NO_BYTE_STATUS | UM_FLAG_NO_BATTREG | UM_FLAG_NO_BATT;
 909                 magic_number = 0x99;
 910                 break;
 911
 912         default:
 913                 magic_number = 0x100;
 914                 break;
 915         }
 916
 917         if (readb(card->csr_remap + MEMCTRLSTATUS_MAGIC) != magic_number) {
 918                 printk(KERN_ERR "MM%d: Magic number invalid\n", card->card_number);
 919                 ret = -ENOMEM;
 920                 goto failed_magic;
 921         }
 922
 923         card->mm_pages[0].desc = pci_alloc_consistent(card->dev,
 924                                                       PAGE_SIZE*2,
 925                                                       &card->mm_pages[0].page_dma);
 926         card->mm_pages[1].desc = pci_alloc_consistent(card->dev,
 927                                                       PAGE_SIZE*2,
 928                                                       &card->mm_pages[1].page_dma);
 929         if (card->mm_pages[0].desc == NULL ||
 930             card->mm_pages[1].desc == NULL) {
 931                 printk(KERN_ERR "MM%d: alloc failed\n", card->card_number);
 932                 goto failed_alloc;
 933         }
 934         reset_page(&card->mm_pages[0]);
 935         reset_page(&card->mm_pages[1]);
 936         card->Ready = 0;        /* page 0 is ready */
 937         card->Active = -1;      /* no page is active */
 938         card->bio = NULL;
 939         card->biotail = &card->bio;
 940
 941         card->queue = blk_alloc_queue(GFP_KERNEL);
 942         if (!card->queue)
 943                 goto failed_alloc;
 944
 945         blk_queue_make_request(card->queue, mm_make_request);
 946         card->queue->queuedata = card;
 947         card->queue->unplug_fn = mm_unplug_device;
 948
 949         tasklet_init(&card->tasklet, process_page, (unsigned long)card);
 950
 951         card->check_batteries = 0;
 952
 953         mem_present = readb(card->csr_remap + MEMCTRLSTATUS_MEMORY);
 954         switch (mem_present) {
 955         case MEM_128_MB:
 956                 card->mm_size = 1024 * 128;
 957                 break;
 958         case MEM_256_MB:
 959                 card->mm_size = 1024 * 256;
 960                 break;
 961         case MEM_512_MB:
 962                 card->mm_size = 1024 * 512;
 963                 break;
 964         case MEM_1_GB:
 965                 card->mm_size = 1024 * 1024;
 966                 break;
 967         case MEM_2_GB:
 968                 card->mm_size = 1024 * 2048;
 969                 break;
 970         default:
 971                 card->mm_size = 0;
 972                 break;
 973         }
 974
 975         /* Clear the LED's we control */
 976         set_led(card, LED_REMOVE, LED_OFF);
 977         set_led(card, LED_FAULT, LED_OFF);
 978
 979         batt_status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
 980
 981         card->battery[0].good = !(batt_status & BATTERY_1_FAILURE);
 982         card->battery[1].good = !(batt_status & BATTERY_2_FAILURE);
 983         card->battery[0].last_change = card->battery[1].last_change = jiffies;
 984
 985         if (card->flags & UM_FLAG_NO_BATT)
 986                 printk(KERN_INFO "MM%d: Size %d KB\n",
 987                        card->card_number, card->mm_size);
 988         else {
 989                 printk(KERN_INFO "MM%d: Size %d KB, Battery 1 %s (%s), Battery 2 %s (%s)\n",
 990                        card->card_number, card->mm_size,
 991                        (batt_status & BATTERY_1_DISABLED ? "Disabled" : "Enabled"),
 992                        card->battery[0].good ? "OK" : "FAILURE",
 993                        (batt_status & BATTERY_2_DISABLED ? "Disabled" : "Enabled"),
 994                        card->battery[1].good ? "OK" : "FAILURE");
 995
 996                 set_fault_to_battery_status(card);
 997         }
 998
 999         pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &saved_bar);
1000         data = 0xffffffff;
1001         pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, data);
1002         pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &data);
1003         pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, saved_bar);
1004         data &= 0xfffffff0;
1005         data = ~data;
1006         data += 1;
1007
1008         card->win_size = data;
1009
1010
1011         if (request_irq(dev->irq, mm_interrupt, IRQF_SHARED, "pci-umem", card)) {
1012                 printk(KERN_ERR "MM%d: Unable to allocate IRQ\n", card->card_number);
1013                 ret = -ENODEV;
1014
1015                 goto failed_req_irq;
1016         }
1017
1018         card->irq = dev->irq;
1019         printk(KERN_INFO "MM%d: Window size %d bytes, IRQ %d\n", card->card_number,
1020                card->win_size, card->irq);
1021
1022         spin_lock_init(&card->lock);
1023
1024         pci_set_drvdata(dev, card);
1025
1026         if (pci_write_cmd != 0x0F)      /* If not Memory Write & Invalidate */
1027                 pci_write_cmd = 0x07;   /* then Memory Write command */
1028
1029         if (pci_write_cmd & 0x08) { /* use Memory Write and Invalidate */
1030                 unsigned short cfg_command;
1031                 pci_read_config_word(dev, PCI_COMMAND, &cfg_command);
1032                 cfg_command |= 0x10; /* Memory Write & Invalidate Enable */
1033                 pci_write_config_word(dev, PCI_COMMAND, cfg_command);
1034         }
1035         pci_cmds = (pci_read_cmd << 28) | (pci_write_cmd << 24);
1036
1037         num_cards++;
1038
1039         if (!get_userbit(card, MEMORY_INITIALIZED)) {
1040                 printk(KERN_INFO "MM%d: memory NOT initialized. Consider over-writing whole device.\n", card->card_number);
1041                 card->init_size = 0;
1042         } else {
1043                 printk(KERN_INFO "MM%d: memory already initialized\n", card->card_number);
1044                 card->init_size = card->mm_size;
1045         }
1046
1047         /* Enable ECC */
1048         writeb(EDC_STORE_CORRECT, card->csr_remap + MEMCTRLCMD_ERRCTRL);
1049
1050         return 0;
1051
1052  failed_req_irq:
1053  failed_alloc:
1054         if (card->mm_pages[0].desc)
1055                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1056                                     card->mm_pages[0].desc,
1057                                     card->mm_pages[0].page_dma);
1058         if (card->mm_pages[1].desc)
1059                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1060                                     card->mm_pages[1].desc,
1061                                     card->mm_pages[1].page_dma);
1062  failed_magic:
1063         iounmap(card->csr_remap);
1064  failed_remap_csr:
1065         release_mem_region(card->csr_base, card->csr_len);
1066  failed_req_csr:
1067
1068         return ret;
1069 }
1070 /*
1071 -----------------------------------------------------------------------------------
1072 --                              mm_pci_remove
1073 -----------------------------------------------------------------------------------
1074 */
1075 static void mm_pci_remove(struct pci_dev *dev)
1076 {
1077         struct cardinfo *card = pci_get_drvdata(dev);
1078
1079         tasklet_kill(&card->tasklet);
1080         iounmap(card->csr_remap);
1081         release_mem_region(card->csr_base, card->csr_len);
1082         free_irq(card->irq, card);
1083
1084         if (card->mm_pages[0].desc)
1085                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1086                                     card->mm_pages[0].desc,
1087                                     card->mm_pages[0].page_dma);
1088         if (card->mm_pages[1].desc)
1089                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1090                                     card->mm_pages[1].desc,
1091                                     card->mm_pages[1].page_dma);
1092         blk_cleanup_queue(card->queue);
1093 }
1094
1095 static const struct pci_device_id mm_pci_ids[] = {
1096     {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY,PCI_DEVICE_ID_MICRO_MEMORY_5415CN)},
1097     {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY,PCI_DEVICE_ID_MICRO_MEMORY_5425CN)},
1098     {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY,PCI_DEVICE_ID_MICRO_MEMORY_6155)},
1099     {
1100         .vendor =       0x8086,
1101         .device =       0xB555,
1102         .subvendor=     0x1332,
1103         .subdevice=     0x5460,
1104         .class  =       0x050000,
1105         .class_mask=    0,
1106     }, { /* end: all zeroes */ }
1107 };
1108
1109 MODULE_DEVICE_TABLE(pci, mm_pci_ids);
1110
1111 static struct pci_driver mm_pci_driver = {
1112         .name =         "umem",
1113         .id_table =     mm_pci_ids,
1114         .probe =        mm_pci_probe,
1115         .remove =       mm_pci_remove,
1116 };
1117 /*
1118 -----------------------------------------------------------------------------------
1119 --                               mm_init
1120 -----------------------------------------------------------------------------------
1121 */
1122
1123 static int __init mm_init(void)
1124 {
1125         int retval, i;
1126         int err;
1127
1128         printk(KERN_INFO DRIVER_VERSION " : " DRIVER_DESC "\n");
1129
1130         retval = pci_register_driver(&mm_pci_driver);
1131         if (retval)
1132                 return -ENOMEM;
1133
1134         err = major_nr = register_blkdev(0, "umem");
1135         if (err < 0) {
1136                 pci_unregister_driver(&mm_pci_driver);
1137                 return -EIO;
1138         }
1139
1140         for (i = 0; i < num_cards; i++) {
1141                 mm_gendisk[i] = alloc_disk(1 << MM_SHIFT);
1142                 if (!mm_gendisk[i])
1143                         goto out;
1144         }
1145
1146         for (i = 0; i < num_cards; i++) {
1147                 struct gendisk *disk = mm_gendisk[i];
1148                 sprintf(disk->disk_name, "umem%c", 'a'+i);
1149                 spin_lock_init(&cards[i].lock);
1150                 disk->major = major_nr;
1151                 disk->first_minor  = i << MM_SHIFT;
1152                 disk->fops = &mm_fops;
1153                 disk->private_data = &cards[i];
1154                 disk->queue = cards[i].queue;
1155                 set_capacity(disk, cards[i].mm_size << 1);
1156                 add_disk(disk);
1157         }
1158
1159         init_battery_timer();
1160         printk("MM: desc_per_page = %ld\n", DESC_PER_PAGE);
1161 /* printk("mm_init: Done. 10-19-01 9:00\n"); */
1162         return 0;
1163
1164 out:
1165         pci_unregister_driver(&mm_pci_driver);
1166         unregister_blkdev(major_nr, "umem");
1167         while (i--)
1168                 put_disk(mm_gendisk[i]);
1169         return -ENOMEM;
1170 }
1171 /*
1172 -----------------------------------------------------------------------------------
1173 --                             mm_cleanup
1174 -----------------------------------------------------------------------------------
1175 */
1176 static void __exit mm_cleanup(void)
1177 {
1178         int i;
1179
1180         del_battery_timer();
1181
1182         for (i=0; i < num_cards ; i++) {
1183                 del_gendisk(mm_gendisk[i]);
1184                 put_disk(mm_gendisk[i]);
1185         }
1186
1187         pci_unregister_driver(&mm_pci_driver);
1188
1189         unregister_blkdev(major_nr, "umem");
1190 }
1191
1192 module_init(mm_init);
1193 module_exit(mm_cleanup);
1194
1195 MODULE_AUTHOR(DRIVER_AUTHOR);
1196 MODULE_DESCRIPTION(DRIVER_DESC);
1197 MODULE_LICENSE("GPL");