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