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