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 "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 = 0;
 147
 148 static struct gendisk *mm_gendisk[MM_MAXCARDS];
 149
 150 static void check_batteries(struct cardinfo *card);
 151
 152 /*
 153 -----------------------------------------------------------------------------------
 154 --                           get_userbit
 155 -----------------------------------------------------------------------------------
 156 */
 157 static int get_userbit(struct cardinfo *card, int bit)
 158 {
 159         unsigned char led;
 160
 161         led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
 162         return led & bit;
 163 }
 164 /*
 165 -----------------------------------------------------------------------------------
 166 --                            set_userbit
 167 -----------------------------------------------------------------------------------
 168 */
 169 static int set_userbit(struct cardinfo *card, int bit, unsigned char state)
 170 {
 171         unsigned char led;
 172
 173         led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
 174         if (state)
 175                 led |= bit;
 176         else
 177                 led &= ~bit;
 178         writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
 179
 180         return 0;
 181 }
 182 /*
 183 -----------------------------------------------------------------------------------
 184 --                             set_led
 185 -----------------------------------------------------------------------------------
 186 */
 187 /*
 188  * NOTE: For the power LED, use the LED_POWER_* macros since they differ
 189  */
 190 static void set_led(struct cardinfo *card, int shift, unsigned char state)
 191 {
 192         unsigned char led;
 193
 194         led = readb(card->csr_remap + MEMCTRLCMD_LEDCTRL);
 195         if (state == LED_FLIP)
 196                 led ^= (1<<shift);
 197         else {
 198                 led &= ~(0x03 << shift);
 199                 led |= (state << shift);
 200         }
 201         writeb(led, card->csr_remap + MEMCTRLCMD_LEDCTRL);
 202
 203 }
 204
 205 #ifdef MM_DIAG
 206 /*
 207 -----------------------------------------------------------------------------------
 208 --                              dump_regs
 209 -----------------------------------------------------------------------------------
 210 */
 211 static void dump_regs(struct cardinfo *card)
 212 {
 213         unsigned char *p;
 214         int i, i1;
 215
 216         p = card->csr_remap;
 217         for (i = 0; i < 8; i++) {
 218                 printk(KERN_DEBUG "%p   ", p);
 219
 220                 for (i1 = 0; i1 < 16; i1++)
 221                         printk("%02x ", *p++);
 222
 223                 printk("\n");
 224         }
 225 }
 226 #endif
 227 /*
 228 -----------------------------------------------------------------------------------
 229 --                            dump_dmastat
 230 -----------------------------------------------------------------------------------
 231 */
 232 static void dump_dmastat(struct cardinfo *card, unsigned int dmastat)
 233 {
 234         dev_printk(KERN_DEBUG, &card->dev->dev, "DMAstat - ");
 235         if (dmastat & DMASCR_ANY_ERR)
 236                 printk("ANY_ERR ");
 237         if (dmastat & DMASCR_MBE_ERR)
 238                 printk("MBE_ERR ");
 239         if (dmastat & DMASCR_PARITY_ERR_REP)
 240                 printk("PARITY_ERR_REP ");
 241         if (dmastat & DMASCR_PARITY_ERR_DET)
 242                 printk("PARITY_ERR_DET ");
 243         if (dmastat & DMASCR_SYSTEM_ERR_SIG)
 244                 printk("SYSTEM_ERR_SIG ");
 245         if (dmastat & DMASCR_TARGET_ABT)
 246                 printk("TARGET_ABT ");
 247         if (dmastat & DMASCR_MASTER_ABT)
 248                 printk("MASTER_ABT ");
 249         if (dmastat & DMASCR_CHAIN_COMPLETE)
 250                 printk("CHAIN_COMPLETE ");
 251         if (dmastat & DMASCR_DMA_COMPLETE)
 252                 printk("DMA_COMPLETE ");
 253         printk("\n");
 254 }
 255
 256 /*
 257  * Theory of request handling
 258  *
 259  * Each bio is assigned to one mm_dma_desc - which may not be enough FIXME
 260  * We have two pages of mm_dma_desc, holding about 64 descriptors
 261  * each.  These are allocated at init time.
 262  * One page is "Ready" and is either full, or can have request added.
 263  * The other page might be "Active", which DMA is happening on it.
 264  *
 265  * Whenever IO on the active page completes, the Ready page is activated
 266  * and the ex-Active page is clean out and made Ready.
 267  * Otherwise the Ready page is only activated when it becomes full, or
 268  * when mm_unplug_device is called via the unplug_io_fn.
 269  *
 270  * If a request arrives while both pages a full, it is queued, and b_rdev is
 271  * overloaded to record whether it was a read or a write.
 272  *
 273  * The interrupt handler only polls the device to clear the interrupt.
 274  * The processing of the result is done in a tasklet.
 275  */
 276
 277 static void mm_start_io(struct cardinfo *card)
 278 {
 279         /* we have the lock, we know there is
 280          * no IO active, and we know that card->Active
 281          * is set
 282          */
 283         struct mm_dma_desc *desc;
 284         struct mm_page *page;
 285         int offset;
 286
 287         /* make the last descriptor end the chain */
 288         page = &card->mm_pages[card->Active];
 289         pr_debug("start_io: %d %d->%d\n", card->Active, page->headcnt, page->cnt-1);
 290         desc = &page->desc[page->cnt-1];
 291
 292         desc->control_bits |= cpu_to_le32(DMASCR_CHAIN_COMP_EN);
 293         desc->control_bits &= ~cpu_to_le32(DMASCR_CHAIN_EN);
 294         desc->sem_control_bits = desc->control_bits;
 295
 296
 297         if (debug & DEBUG_LED_ON_TRANSFER)
 298                 set_led(card, LED_REMOVE, LED_ON);
 299
 300         desc = &page->desc[page->headcnt];
 301         writel(0, card->csr_remap + DMA_PCI_ADDR);
 302         writel(0, card->csr_remap + DMA_PCI_ADDR + 4);
 303
 304         writel(0, card->csr_remap + DMA_LOCAL_ADDR);
 305         writel(0, card->csr_remap + DMA_LOCAL_ADDR + 4);
 306
 307         writel(0, card->csr_remap + DMA_TRANSFER_SIZE);
 308         writel(0, card->csr_remap + DMA_TRANSFER_SIZE + 4);
 309
 310         writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR);
 311         writel(0, card->csr_remap + DMA_SEMAPHORE_ADDR + 4);
 312
 313         offset = ((char*)desc) - ((char*)page->desc);
 314         writel(cpu_to_le32((page->page_dma+offset)&0xffffffff),
 315                card->csr_remap + DMA_DESCRIPTOR_ADDR);
 316         /* Force the value to u64 before shifting otherwise >> 32 is undefined C
 317          * and on some ports will do nothing ! */
 318         writel(cpu_to_le32(((u64)page->page_dma)>>32),
 319                card->csr_remap + DMA_DESCRIPTOR_ADDR + 4);
 320
 321         /* Go, go, go */
 322         writel(cpu_to_le32(DMASCR_GO | DMASCR_CHAIN_EN | pci_cmds),
 323                card->csr_remap + DMA_STATUS_CTRL);
 324 }
 325
 326 static int add_bio(struct cardinfo *card);
 327
 328 static void activate(struct cardinfo *card)
 329 {
 330         /* if No page is Active, and Ready is
 331          * not empty, then switch Ready page
 332          * to active and start IO.
 333          * Then add any bh's that are available to Ready
 334          */
 335
 336         do {
 337                 while (add_bio(card))
 338                         ;
 339
 340                 if (card->Active == -1 &&
 341                     card->mm_pages[card->Ready].cnt > 0) {
 342                         card->Active = card->Ready;
 343                         card->Ready = 1-card->Ready;
 344                         mm_start_io(card);
 345                 }
 346
 347         } while (card->Active == -1 && add_bio(card));
 348 }
 349
 350 static inline void reset_page(struct mm_page *page)
 351 {
 352         page->cnt = 0;
 353         page->headcnt = 0;
 354         page->bio = NULL;
 355         page->biotail = & page->bio;
 356 }
 357
 358 static void mm_unplug_device(struct request_queue *q)
 359 {
 360         struct cardinfo *card = q->queuedata;
 361         unsigned long flags;
 362
 363         spin_lock_irqsave(&card->lock, flags);
 364         if (blk_remove_plug(q))
 365                 activate(card);
 366         spin_unlock_irqrestore(&card->lock, flags);
 367 }
 368
 369 /*
 370  * If there is room on Ready page, take
 371  * one bh off list and add it.
 372  * return 1 if there was room, else 0.
 373  */
 374 static int add_bio(struct cardinfo *card)
 375 {
 376         struct mm_page *p;
 377         struct mm_dma_desc *desc;
 378         dma_addr_t dma_handle;
 379         int offset;
 380         struct bio *bio;
 381         struct bio_vec *vec;
 382         int idx;
 383         int rw;
 384         int len;
 385
 386         bio = card->currentbio;
 387         if (!bio && card->bio) {
 388                 card->currentbio = card->bio;
 389                 card->current_idx = card->bio->bi_idx;
 390                 card->current_sector = card->bio->bi_sector;
 391                 card->bio = card->bio->bi_next;
 392                 if (card->bio == NULL)
 393                         card->biotail = &card->bio;
 394                 card->currentbio->bi_next = NULL;
 395                 return 1;
 396         }
 397         if (!bio)
 398                 return 0;
 399         idx = card->current_idx;
 400
 401         rw = bio_rw(bio);
 402         if (card->mm_pages[card->Ready].cnt >= DESC_PER_PAGE)
 403                 return 0;
 404
 405         vec = bio_iovec_idx(bio, idx);
 406         len = vec->bv_len;
 407         dma_handle = pci_map_page(card->dev,
 408                                   vec->bv_page,
 409                                   vec->bv_offset,
 410                                   len,
 411                                   (rw==READ) ?
 412                                   PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
 413
 414         p = &card->mm_pages[card->Ready];
 415         desc = &p->desc[p->cnt];
 416         p->cnt++;
 417         if (p->bio == NULL)
 418                 p->idx = idx;
 419         if ((p->biotail) != &bio->bi_next) {
 420                 *(p->biotail) = bio;
 421                 p->biotail = &(bio->bi_next);
 422                 bio->bi_next = NULL;
 423         }
 424
 425         desc->data_dma_handle = dma_handle;
 426
 427         desc->pci_addr = cpu_to_le64((u64)desc->data_dma_handle);
 428         desc->local_addr = cpu_to_le64(card->current_sector << 9);
 429         desc->transfer_size = cpu_to_le32(len);
 430         offset = ( ((char*)&desc->sem_control_bits) - ((char*)p->desc));
 431         desc->sem_addr = cpu_to_le64((u64)(p->page_dma+offset));
 432         desc->zero1 = desc->zero2 = 0;
 433         offset = ( ((char*)(desc+1)) - ((char*)p->desc));
 434         desc->next_desc_addr = cpu_to_le64(p->page_dma+offset);
 435         desc->control_bits = cpu_to_le32(DMASCR_GO|DMASCR_ERR_INT_EN|
 436                                          DMASCR_PARITY_INT_EN|
 437                                          DMASCR_CHAIN_EN |
 438                                          DMASCR_SEM_EN |
 439                                          pci_cmds);
 440         if (rw == WRITE)
 441                 desc->control_bits |= cpu_to_le32(DMASCR_TRANSFER_READ);
 442         desc->sem_control_bits = desc->control_bits;
 443
 444         card->current_sector += (len >> 9);
 445         idx++;
 446         card->current_idx = idx;
 447         if (idx >= bio->bi_vcnt)
 448                 card->currentbio = NULL;
 449
 450         return 1;
 451 }
 452
 453 static void process_page(unsigned long data)
 454 {
 455         /* check if any of the requests in the page are DMA_COMPLETE,
 456          * and deal with them appropriately.
 457          * If we find a descriptor without DMA_COMPLETE in the semaphore, then
 458          * dma must have hit an error on that descriptor, so use dma_status instead
 459          * and assume that all following descriptors must be re-tried.
 460          */
 461         struct mm_page *page;
 462         struct bio *return_bio=NULL;
 463         struct cardinfo *card = (struct cardinfo *)data;
 464         unsigned int dma_status = card->dma_status;
 465
 466         spin_lock_bh(&card->lock);
 467         if (card->Active < 0)
 468                 goto out_unlock;
 469         page = &card->mm_pages[card->Active];
 470
 471         while (page->headcnt < page->cnt) {
 472                 struct bio *bio = page->bio;
 473                 struct mm_dma_desc *desc = &page->desc[page->headcnt];
 474                 int control = le32_to_cpu(desc->sem_control_bits);
 475                 int last=0;
 476                 int idx;
 477
 478                 if (!(control & DMASCR_DMA_COMPLETE)) {
 479                         control = dma_status;
 480                         last=1;
 481                 }
 482                 page->headcnt++;
 483                 idx = page->idx;
 484                 page->idx++;
 485                 if (page->idx >= bio->bi_vcnt) {
 486                         page->bio = bio->bi_next;
 487                         page->idx = page->bio->bi_idx;
 488                 }
 489
 490                 pci_unmap_page(card->dev, desc->data_dma_handle,
 491                                bio_iovec_idx(bio,idx)->bv_len,
 492                                  (control& DMASCR_TRANSFER_READ) ?
 493                                 PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
 494                 if (control & DMASCR_HARD_ERROR) {
 495                         /* error */
 496                         clear_bit(BIO_UPTODATE, &bio->bi_flags);
 497                         dev_printk(KERN_WARNING, &card->dev->dev,
 498                                 "I/O error on sector %d/%d\n",
 499                                 le32_to_cpu(desc->local_addr)>>9,
 500                                 le32_to_cpu(desc->transfer_size));
 501                         dump_dmastat(card, control);
 502                 } else if (test_bit(BIO_RW, &bio->bi_rw) &&
 503                            le32_to_cpu(desc->local_addr)>>9 == card->init_size) {
 504                         card->init_size += le32_to_cpu(desc->transfer_size)>>9;
 505                         if (card->init_size>>1 >= card->mm_size) {
 506                                 dev_printk(KERN_INFO, &card->dev->dev,
 507                                         "memory now initialised\n");
 508                                 set_userbit(card, MEMORY_INITIALIZED, 1);
 509                         }
 510                 }
 511                 if (bio != page->bio) {
 512                         bio->bi_next = return_bio;
 513                         return_bio = bio;
 514                 }
 515
 516                 if (last) break;
 517         }
 518
 519         if (debug & DEBUG_LED_ON_TRANSFER)
 520                 set_led(card, LED_REMOVE, LED_OFF);
 521
 522         if (card->check_batteries) {
 523                 card->check_batteries = 0;
 524                 check_batteries(card);
 525         }
 526         if (page->headcnt >= page->cnt) {
 527                 reset_page(page);
 528                 card->Active = -1;
 529                 activate(card);
 530         } else {
 531                 /* haven't finished with this one yet */
 532                 pr_debug("do some more\n");
 533                 mm_start_io(card);
 534         }
 535  out_unlock:
 536         spin_unlock_bh(&card->lock);
 537
 538         while(return_bio) {
 539                 struct bio *bio = return_bio;
 540
 541                 return_bio = bio->bi_next;
 542                 bio->bi_next = NULL;
 543                 bio_endio(bio, 0);
 544         }
 545 }
 546
 547 /*
 548 -----------------------------------------------------------------------------------
 549 --                              mm_make_request
 550 -----------------------------------------------------------------------------------
 551 */
 552 static int mm_make_request(struct request_queue *q, struct bio *bio)
 553 {
 554         struct cardinfo *card = q->queuedata;
 555         pr_debug("mm_make_request %llu %u\n",
 556                  (unsigned long long)bio->bi_sector, bio->bi_size);
 557
 558         spin_lock_irq(&card->lock);
 559         *card->biotail = bio;
 560         bio->bi_next = NULL;
 561         card->biotail = &bio->bi_next;
 562         blk_plug_device(q);
 563         spin_unlock_irq(&card->lock);
 564
 565         return 0;
 566 }
 567
 568 /*
 569 -----------------------------------------------------------------------------------
 570 --                              mm_interrupt
 571 -----------------------------------------------------------------------------------
 572 */
 573 static irqreturn_t mm_interrupt(int irq, void *__card)
 574 {
 575         struct cardinfo *card = (struct cardinfo *) __card;
 576         unsigned int dma_status;
 577         unsigned short cfg_status;
 578
 579 HW_TRACE(0x30);
 580
 581         dma_status = le32_to_cpu(readl(card->csr_remap + DMA_STATUS_CTRL));
 582
 583         if (!(dma_status & (DMASCR_ERROR_MASK | DMASCR_CHAIN_COMPLETE))) {
 584                 /* interrupt wasn't for me ... */
 585                 return IRQ_NONE;
 586         }
 587
 588         /* clear COMPLETION interrupts */
 589         if (card->flags & UM_FLAG_NO_BYTE_STATUS)
 590                 writel(cpu_to_le32(DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE),
 591                        card->csr_remap+ DMA_STATUS_CTRL);
 592         else
 593                 writeb((DMASCR_DMA_COMPLETE|DMASCR_CHAIN_COMPLETE) >> 16,
 594                        card->csr_remap+ DMA_STATUS_CTRL + 2);
 595
 596         /* log errors and clear interrupt status */
 597         if (dma_status & DMASCR_ANY_ERR) {
 598                 unsigned int    data_log1, data_log2;
 599                 unsigned int    addr_log1, addr_log2;
 600                 unsigned char   stat, count, syndrome, check;
 601
 602                 stat = readb(card->csr_remap + MEMCTRLCMD_ERRSTATUS);
 603
 604                 data_log1 = le32_to_cpu(readl(card->csr_remap + ERROR_DATA_LOG));
 605                 data_log2 = le32_to_cpu(readl(card->csr_remap + ERROR_DATA_LOG + 4));
 606                 addr_log1 = le32_to_cpu(readl(card->csr_remap + ERROR_ADDR_LOG));
 607                 addr_log2 = readb(card->csr_remap + ERROR_ADDR_LOG + 4);
 608
 609                 count = readb(card->csr_remap + ERROR_COUNT);
 610                 syndrome = readb(card->csr_remap + ERROR_SYNDROME);
 611                 check = readb(card->csr_remap + ERROR_CHECK);
 612
 613                 dump_dmastat(card, dma_status);
 614
 615                 if (stat & 0x01)
 616                         dev_printk(KERN_ERR, &card->dev->dev,
 617                                 "Memory access error detected (err count %d)\n",
 618                                 count);
 619                 if (stat & 0x02)
 620                         dev_printk(KERN_ERR, &card->dev->dev,
 621                                 "Multi-bit EDC error\n");
 622
 623                 dev_printk(KERN_ERR, &card->dev->dev,
 624                         "Fault Address 0x%02x%08x, Fault Data 0x%08x%08x\n",
 625                         addr_log2, addr_log1, data_log2, data_log1);
 626                 dev_printk(KERN_ERR, &card->dev->dev,
 627                         "Fault Check 0x%02x, Fault Syndrome 0x%02x\n",
 628                         check, syndrome);
 629
 630                 writeb(0, card->csr_remap + ERROR_COUNT);
 631         }
 632
 633         if (dma_status & DMASCR_PARITY_ERR_REP) {
 634                 dev_printk(KERN_ERR, &card->dev->dev,
 635                         "PARITY ERROR REPORTED\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         if (dma_status & DMASCR_PARITY_ERR_DET) {
 641                 dev_printk(KERN_ERR, &card->dev->dev,
 642                         "PARITY ERROR DETECTED\n");
 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_SYSTEM_ERR_SIG) {
 648                 dev_printk(KERN_ERR, &card->dev->dev, "SYSTEM ERROR\n");
 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         if (dma_status & DMASCR_TARGET_ABT) {
 654                 dev_printk(KERN_ERR, &card->dev->dev, "TARGET ABORT\n");
 655                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 656                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 657         }
 658
 659         if (dma_status & DMASCR_MASTER_ABT) {
 660                 dev_printk(KERN_ERR, &card->dev->dev, "MASTER ABORT\n");
 661                 pci_read_config_word(card->dev, PCI_STATUS, &cfg_status);
 662                 pci_write_config_word(card->dev, PCI_STATUS, cfg_status);
 663         }
 664
 665         /* and process the DMA descriptors */
 666         card->dma_status = dma_status;
 667         tasklet_schedule(&card->tasklet);
 668
 669 HW_TRACE(0x36);
 670
 671         return IRQ_HANDLED;
 672 }
 673 /*
 674 -----------------------------------------------------------------------------------
 675 --                         set_fault_to_battery_status
 676 -----------------------------------------------------------------------------------
 677 */
 678 /*
 679  * If both batteries are good, no LED
 680  * If either battery has been warned, solid LED
 681  * If both batteries are bad, flash the LED quickly
 682  * If either battery is bad, flash the LED semi quickly
 683  */
 684 static void set_fault_to_battery_status(struct cardinfo *card)
 685 {
 686         if (card->battery[0].good && card->battery[1].good)
 687                 set_led(card, LED_FAULT, LED_OFF);
 688         else if (card->battery[0].warned || card->battery[1].warned)
 689                 set_led(card, LED_FAULT, LED_ON);
 690         else if (!card->battery[0].good && !card->battery[1].good)
 691                 set_led(card, LED_FAULT, LED_FLASH_7_0);
 692         else
 693                 set_led(card, LED_FAULT, LED_FLASH_3_5);
 694 }
 695
 696 static void init_battery_timer(void);
 697
 698
 699 /*
 700 -----------------------------------------------------------------------------------
 701 --                            check_battery
 702 -----------------------------------------------------------------------------------
 703 */
 704 static int check_battery(struct cardinfo *card, int battery, int status)
 705 {
 706         if (status != card->battery[battery].good) {
 707                 card->battery[battery].good = !card->battery[battery].good;
 708                 card->battery[battery].last_change = jiffies;
 709
 710                 if (card->battery[battery].good) {
 711                         dev_printk(KERN_ERR, &card->dev->dev,
 712                                 "Battery %d now good\n", battery + 1);
 713                         card->battery[battery].warned = 0;
 714                 } else
 715                         dev_printk(KERN_ERR, &card->dev->dev,
 716                                 "Battery %d now FAILED\n", battery + 1);
 717
 718                 return 1;
 719         } else if (!card->battery[battery].good &&
 720                    !card->battery[battery].warned &&
 721                    time_after_eq(jiffies, card->battery[battery].last_change +
 722                                  (HZ * 60 * 60 * 5))) {
 723                 dev_printk(KERN_ERR, &card->dev->dev,
 724                         "Battery %d still FAILED after 5 hours\n", battery + 1);
 725                 card->battery[battery].warned = 1;
 726
 727                 return 1;
 728         }
 729
 730         return 0;
 731 }
 732 /*
 733 -----------------------------------------------------------------------------------
 734 --                              check_batteries
 735 -----------------------------------------------------------------------------------
 736 */
 737 static void check_batteries(struct cardinfo *card)
 738 {
 739         /* NOTE: this must *never* be called while the card
 740          * is doing (bus-to-card) DMA, or you will need the
 741          * reset switch
 742          */
 743         unsigned char status;
 744         int ret1, ret2;
 745
 746         status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
 747         if (debug & DEBUG_BATTERY_POLLING)
 748                 dev_printk(KERN_DEBUG, &card->dev->dev,
 749                         "checking battery status, 1 = %s, 2 = %s\n",
 750                        (status & BATTERY_1_FAILURE) ? "FAILURE" : "OK",
 751                        (status & BATTERY_2_FAILURE) ? "FAILURE" : "OK");
 752
 753         ret1 = check_battery(card, 0, !(status & BATTERY_1_FAILURE));
 754         ret2 = check_battery(card, 1, !(status & BATTERY_2_FAILURE));
 755
 756         if (ret1 || ret2)
 757                 set_fault_to_battery_status(card);
 758 }
 759
 760 static void check_all_batteries(unsigned long ptr)
 761 {
 762         int i;
 763
 764         for (i = 0; i < num_cards; i++)
 765                 if (!(cards[i].flags & UM_FLAG_NO_BATT)) {
 766                         struct cardinfo *card = &cards[i];
 767                         spin_lock_bh(&card->lock);
 768                         if (card->Active >= 0)
 769                                 card->check_batteries = 1;
 770                         else
 771                                 check_batteries(card);
 772                         spin_unlock_bh(&card->lock);
 773                 }
 774
 775         init_battery_timer();
 776 }
 777 /*
 778 -----------------------------------------------------------------------------------
 779 --                            init_battery_timer
 780 -----------------------------------------------------------------------------------
 781 */
 782 static void init_battery_timer(void)
 783 {
 784         init_timer(&battery_timer);
 785         battery_timer.function = check_all_batteries;
 786         battery_timer.expires = jiffies + (HZ * 60);
 787         add_timer(&battery_timer);
 788 }
 789 /*
 790 -----------------------------------------------------------------------------------
 791 --                              del_battery_timer
 792 -----------------------------------------------------------------------------------
 793 */
 794 static void del_battery_timer(void)
 795 {
 796         del_timer(&battery_timer);
 797 }
 798 /*
 799 -----------------------------------------------------------------------------------
 800 --                                mm_revalidate
 801 -----------------------------------------------------------------------------------
 802 */
 803 /*
 804  * Note no locks taken out here.  In a worst case scenario, we could drop
 805  * a chunk of system memory.  But that should never happen, since validation
 806  * happens at open or mount time, when locks are held.
 807  *
 808  *      That's crap, since doing that while some partitions are opened
 809  * or mounted will give you really nasty results.
 810  */
 811 static int mm_revalidate(struct gendisk *disk)
 812 {
 813         struct cardinfo *card = disk->private_data;
 814         set_capacity(disk, card->mm_size << 1);
 815         return 0;
 816 }
 817
 818 static int mm_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 819 {
 820         struct cardinfo *card = bdev->bd_disk->private_data;
 821         int size = card->mm_size * (1024 / MM_HARDSECT);
 822
 823         /*
 824          * get geometry: we have to fake one...  trim the size to a
 825          * multiple of 2048 (1M): tell we have 32 sectors, 64 heads,
 826          * whatever cylinders.
 827          */
 828         geo->heads     = 64;
 829         geo->sectors   = 32;
 830         geo->cylinders = size / (geo->heads * geo->sectors);
 831         return 0;
 832 }
 833
 834 /*
 835 -----------------------------------------------------------------------------------
 836 --                                mm_check_change
 837 -----------------------------------------------------------------------------------
 838   Future support for removable devices
 839 */
 840 static int mm_check_change(struct gendisk *disk)
 841 {
 842 /*  struct cardinfo *dev = disk->private_data; */
 843         return 0;
 844 }
 845 /*
 846 -----------------------------------------------------------------------------------
 847 --                             mm_fops
 848 -----------------------------------------------------------------------------------
 849 */
 850 static struct block_device_operations mm_fops = {
 851         .owner          = THIS_MODULE,
 852         .getgeo         = mm_getgeo,
 853         .revalidate_disk= mm_revalidate,
 854         .media_changed  = mm_check_change,
 855 };
 856 /*
 857 -----------------------------------------------------------------------------------
 858 --                                mm_pci_probe
 859 -----------------------------------------------------------------------------------
 860 */
 861 static int __devinit mm_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 862 {
 863         int ret = -ENODEV;
 864         struct cardinfo *card = &cards[num_cards];
 865         unsigned char   mem_present;
 866         unsigned char   batt_status;
 867         unsigned int    saved_bar, data;
 868         unsigned long   csr_base;
 869         unsigned long   csr_len;
 870         int             magic_number;
 871         static int      printed_version;
 872
 873         if (!printed_version++)
 874                 printk(KERN_INFO DRIVER_VERSION " : " DRIVER_DESC "\n");
 875
 876         ret = pci_enable_device(dev);
 877         if (ret)
 878                 return ret;
 879
 880         pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xF8);
 881         pci_set_master(dev);
 882
 883         card->dev         = dev;
 884
 885         csr_base = pci_resource_start(dev, 0);
 886         csr_len  = pci_resource_len(dev, 0);
 887         if (!csr_base || !csr_len)
 888                 return -ENODEV;
 889
 890         dev_printk(KERN_INFO, &dev->dev,
 891                 "Micro Memory(tm) controller found (PCI Mem Module (Battery Backup))\n");
 892
 893         if (pci_set_dma_mask(dev, DMA_64BIT_MASK) &&
 894             pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
 895                 dev_printk(KERN_WARNING, &dev->dev, "NO suitable DMA found\n");
 896                 return  -ENOMEM;
 897         }
 898
 899         ret = pci_request_regions(dev, DRIVER_NAME);
 900         if (ret) {
 901                 dev_printk(KERN_ERR, &card->dev->dev,
 902                         "Unable to request memory region\n");
 903                 goto failed_req_csr;
 904         }
 905
 906         card->csr_remap = ioremap_nocache(csr_base, csr_len);
 907         if (!card->csr_remap) {
 908                 dev_printk(KERN_ERR, &card->dev->dev,
 909                         "Unable to remap memory region\n");
 910                 ret = -ENOMEM;
 911
 912                 goto failed_remap_csr;
 913         }
 914
 915         dev_printk(KERN_INFO, &card->dev->dev,
 916                 "CSR 0x%08lx -> 0x%p (0x%lx)\n",
 917                csr_base, card->csr_remap, csr_len);
 918
 919         switch(card->dev->device) {
 920         case 0x5415:
 921                 card->flags |= UM_FLAG_NO_BYTE_STATUS | UM_FLAG_NO_BATTREG;
 922                 magic_number = 0x59;
 923                 break;
 924
 925         case 0x5425:
 926                 card->flags |= UM_FLAG_NO_BYTE_STATUS;
 927                 magic_number = 0x5C;
 928                 break;
 929
 930         case 0x6155:
 931                 card->flags |= UM_FLAG_NO_BYTE_STATUS | UM_FLAG_NO_BATTREG | UM_FLAG_NO_BATT;
 932                 magic_number = 0x99;
 933                 break;
 934
 935         default:
 936                 magic_number = 0x100;
 937                 break;
 938         }
 939
 940         if (readb(card->csr_remap + MEMCTRLSTATUS_MAGIC) != magic_number) {
 941                 dev_printk(KERN_ERR, &card->dev->dev, "Magic number invalid\n");
 942                 ret = -ENOMEM;
 943                 goto failed_magic;
 944         }
 945
 946         card->mm_pages[0].desc = pci_alloc_consistent(card->dev,
 947                                                       PAGE_SIZE*2,
 948                                                       &card->mm_pages[0].page_dma);
 949         card->mm_pages[1].desc = pci_alloc_consistent(card->dev,
 950                                                       PAGE_SIZE*2,
 951                                                       &card->mm_pages[1].page_dma);
 952         if (card->mm_pages[0].desc == NULL ||
 953             card->mm_pages[1].desc == NULL) {
 954                 dev_printk(KERN_ERR, &card->dev->dev, "alloc failed\n");
 955                 goto failed_alloc;
 956         }
 957         reset_page(&card->mm_pages[0]);
 958         reset_page(&card->mm_pages[1]);
 959         card->Ready = 0;        /* page 0 is ready */
 960         card->Active = -1;      /* no page is active */
 961         card->bio = NULL;
 962         card->biotail = &card->bio;
 963
 964         card->queue = blk_alloc_queue(GFP_KERNEL);
 965         if (!card->queue)
 966                 goto failed_alloc;
 967
 968         blk_queue_make_request(card->queue, mm_make_request);
 969         card->queue->queuedata = card;
 970         card->queue->unplug_fn = mm_unplug_device;
 971
 972         tasklet_init(&card->tasklet, process_page, (unsigned long)card);
 973
 974         card->check_batteries = 0;
 975
 976         mem_present = readb(card->csr_remap + MEMCTRLSTATUS_MEMORY);
 977         switch (mem_present) {
 978         case MEM_128_MB:
 979                 card->mm_size = 1024 * 128;
 980                 break;
 981         case MEM_256_MB:
 982                 card->mm_size = 1024 * 256;
 983                 break;
 984         case MEM_512_MB:
 985                 card->mm_size = 1024 * 512;
 986                 break;
 987         case MEM_1_GB:
 988                 card->mm_size = 1024 * 1024;
 989                 break;
 990         case MEM_2_GB:
 991                 card->mm_size = 1024 * 2048;
 992                 break;
 993         default:
 994                 card->mm_size = 0;
 995                 break;
 996         }
 997
 998         /* Clear the LED's we control */
 999         set_led(card, LED_REMOVE, LED_OFF);
1000         set_led(card, LED_FAULT, LED_OFF);
1001
1002         batt_status = readb(card->csr_remap + MEMCTRLSTATUS_BATTERY);
1003
1004         card->battery[0].good = !(batt_status & BATTERY_1_FAILURE);
1005         card->battery[1].good = !(batt_status & BATTERY_2_FAILURE);
1006         card->battery[0].last_change = card->battery[1].last_change = jiffies;
1007
1008         if (card->flags & UM_FLAG_NO_BATT)
1009                 dev_printk(KERN_INFO, &card->dev->dev,
1010                         "Size %d KB\n", card->mm_size);
1011         else {
1012                 dev_printk(KERN_INFO, &card->dev->dev,
1013                         "Size %d KB, Battery 1 %s (%s), Battery 2 %s (%s)\n",
1014                        card->mm_size,
1015                        (batt_status & BATTERY_1_DISABLED ? "Disabled" : "Enabled"),
1016                        card->battery[0].good ? "OK" : "FAILURE",
1017                        (batt_status & BATTERY_2_DISABLED ? "Disabled" : "Enabled"),
1018                        card->battery[1].good ? "OK" : "FAILURE");
1019
1020                 set_fault_to_battery_status(card);
1021         }
1022
1023         pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &saved_bar);
1024         data = 0xffffffff;
1025         pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, data);
1026         pci_read_config_dword(dev, PCI_BASE_ADDRESS_1, &data);
1027         pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, saved_bar);
1028         data &= 0xfffffff0;
1029         data = ~data;
1030         data += 1;
1031
1032         if (request_irq(dev->irq, mm_interrupt, IRQF_SHARED, "pci-umem", card)) {
1033                 dev_printk(KERN_ERR, &card->dev->dev,
1034                         "Unable to allocate IRQ\n");
1035                 ret = -ENODEV;
1036
1037                 goto failed_req_irq;
1038         }
1039
1040         dev_printk(KERN_INFO, &card->dev->dev,
1041                 "Window size %d bytes, IRQ %d\n", data, dev->irq);
1042
1043         spin_lock_init(&card->lock);
1044
1045         pci_set_drvdata(dev, card);
1046
1047         if (pci_write_cmd != 0x0F)      /* If not Memory Write & Invalidate */
1048                 pci_write_cmd = 0x07;   /* then Memory Write command */
1049
1050         if (pci_write_cmd & 0x08) { /* use Memory Write and Invalidate */
1051                 unsigned short cfg_command;
1052                 pci_read_config_word(dev, PCI_COMMAND, &cfg_command);
1053                 cfg_command |= 0x10; /* Memory Write & Invalidate Enable */
1054                 pci_write_config_word(dev, PCI_COMMAND, cfg_command);
1055         }
1056         pci_cmds = (pci_read_cmd << 28) | (pci_write_cmd << 24);
1057
1058         num_cards++;
1059
1060         if (!get_userbit(card, MEMORY_INITIALIZED)) {
1061                 dev_printk(KERN_INFO, &card->dev->dev,
1062                         "memory NOT initialized. Consider over-writing whole device.\n");
1063                 card->init_size = 0;
1064         } else {
1065                 dev_printk(KERN_INFO, &card->dev->dev,
1066                         "memory already initialized\n");
1067                 card->init_size = card->mm_size;
1068         }
1069
1070         /* Enable ECC */
1071         writeb(EDC_STORE_CORRECT, card->csr_remap + MEMCTRLCMD_ERRCTRL);
1072
1073         return 0;
1074
1075  failed_req_irq:
1076  failed_alloc:
1077         if (card->mm_pages[0].desc)
1078                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1079                                     card->mm_pages[0].desc,
1080                                     card->mm_pages[0].page_dma);
1081         if (card->mm_pages[1].desc)
1082                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1083                                     card->mm_pages[1].desc,
1084                                     card->mm_pages[1].page_dma);
1085  failed_magic:
1086         iounmap(card->csr_remap);
1087  failed_remap_csr:
1088         pci_release_regions(dev);
1089  failed_req_csr:
1090
1091         return ret;
1092 }
1093 /*
1094 -----------------------------------------------------------------------------------
1095 --                              mm_pci_remove
1096 -----------------------------------------------------------------------------------
1097 */
1098 static void mm_pci_remove(struct pci_dev *dev)
1099 {
1100         struct cardinfo *card = pci_get_drvdata(dev);
1101
1102         tasklet_kill(&card->tasklet);
1103         free_irq(dev->irq, card);
1104         iounmap(card->csr_remap);
1105
1106         if (card->mm_pages[0].desc)
1107                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1108                                     card->mm_pages[0].desc,
1109                                     card->mm_pages[0].page_dma);
1110         if (card->mm_pages[1].desc)
1111                 pci_free_consistent(card->dev, PAGE_SIZE*2,
1112                                     card->mm_pages[1].desc,
1113                                     card->mm_pages[1].page_dma);
1114         blk_cleanup_queue(card->queue);
1115
1116         pci_release_regions(dev);
1117         pci_disable_device(dev);
1118 }
1119
1120 static const struct pci_device_id mm_pci_ids[] = {
1121     {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY,PCI_DEVICE_ID_MICRO_MEMORY_5415CN)},
1122     {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY,PCI_DEVICE_ID_MICRO_MEMORY_5425CN)},
1123     {PCI_DEVICE(PCI_VENDOR_ID_MICRO_MEMORY,PCI_DEVICE_ID_MICRO_MEMORY_6155)},
1124     {
1125         .vendor =       0x8086,
1126         .device =       0xB555,
1127         .subvendor=     0x1332,
1128         .subdevice=     0x5460,
1129         .class  =       0x050000,
1130         .class_mask=    0,
1131     }, { /* end: all zeroes */ }
1132 };
1133
1134 MODULE_DEVICE_TABLE(pci, mm_pci_ids);
1135
1136 static struct pci_driver mm_pci_driver = {
1137         .name           = DRIVER_NAME,
1138         .id_table       = mm_pci_ids,
1139         .probe          = mm_pci_probe,
1140         .remove         = mm_pci_remove,
1141 };
1142
1143 /*
1144 -----------------------------------------------------------------------------------
1145 --                               mm_init
1146 -----------------------------------------------------------------------------------
1147 */
1148
1149 static int __init mm_init(void)
1150 {
1151         int retval, i;
1152         int err;
1153
1154         retval = pci_register_driver(&mm_pci_driver);
1155         if (retval)
1156                 return -ENOMEM;
1157
1158         err = major_nr = register_blkdev(0, "umem");
1159         if (err < 0) {
1160                 pci_unregister_driver(&mm_pci_driver);
1161                 return -EIO;
1162         }
1163
1164         for (i = 0; i < num_cards; i++) {
1165                 mm_gendisk[i] = alloc_disk(1 << MM_SHIFT);
1166                 if (!mm_gendisk[i])
1167                         goto out;
1168         }
1169
1170         for (i = 0; i < num_cards; i++) {
1171                 struct gendisk *disk = mm_gendisk[i];
1172                 sprintf(disk->disk_name, "umem%c", 'a'+i);
1173                 spin_lock_init(&cards[i].lock);
1174                 disk->major = major_nr;
1175                 disk->first_minor  = i << MM_SHIFT;
1176                 disk->fops = &mm_fops;
1177                 disk->private_data = &cards[i];
1178                 disk->queue = cards[i].queue;
1179                 set_capacity(disk, cards[i].mm_size << 1);
1180                 add_disk(disk);
1181         }
1182
1183         init_battery_timer();
1184         printk(KERN_INFO "MM: desc_per_page = %ld\n", DESC_PER_PAGE);
1185 /* printk("mm_init: Done. 10-19-01 9:00\n"); */
1186         return 0;
1187
1188 out:
1189         pci_unregister_driver(&mm_pci_driver);
1190         unregister_blkdev(major_nr, "umem");
1191         while (i--)
1192                 put_disk(mm_gendisk[i]);
1193         return -ENOMEM;
1194 }
1195 /*
1196 -----------------------------------------------------------------------------------
1197 --                             mm_cleanup
1198 -----------------------------------------------------------------------------------
1199 */
1200 static void __exit mm_cleanup(void)
1201 {
1202         int i;
1203
1204         del_battery_timer();
1205
1206         for (i=0; i < num_cards ; i++) {
1207                 del_gendisk(mm_gendisk[i]);
1208                 put_disk(mm_gendisk[i]);
1209         }
1210
1211         pci_unregister_driver(&mm_pci_driver);
1212
1213         unregister_blkdev(major_nr, "umem");
1214 }
1215
1216 module_init(mm_init);
1217 module_exit(mm_cleanup);
1218
1219 MODULE_AUTHOR(DRIVER_AUTHOR);
1220 MODULE_DESCRIPTION(DRIVER_DESC);
1221 MODULE_LICENSE("GPL");