drivers/mtd/chips/sharp.c

   1 /*
   2  * MTD chip driver for pre-CFI Sharp flash chips
   3  *
   4  * Copyright 2000,2001 David A. Schleef <ds@schleef.org>
   5  *           2000,2001 Lineo, Inc.
   6  *
   7  * $Id: sharp.c,v 1.12 2003/05/28 15:39:52 dwmw2 Exp $
   8  *
   9  * Devices supported:
  10  *   LH28F016SCT Symmetrical block flash memory, 2Mx8
  11  *   LH28F008SCT Symmetrical block flash memory, 1Mx8
  12  *
  13  * Documentation:
  14  *   http://www.sharpmeg.com/datasheets/memic/flashcmp/
  15  *   http://www.sharpmeg.com/datasheets/memic/flashcmp/01symf/16m/016sctl9.pdf
  16  *   016sctl9.pdf
  17  *
  18  * Limitations:
  19  *   This driver only supports 4x1 arrangement of chips.
  20  *   Not tested on anything but PowerPC.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/sched.h>
  27 #include <linux/errno.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/mtd/map.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/cfi.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34
  35 #define CMD_RESET               0xffffffff
  36 #define CMD_READ_ID             0x90909090
  37 #define CMD_READ_STATUS         0x70707070
  38 #define CMD_CLEAR_STATUS        0x50505050
  39 #define CMD_BLOCK_ERASE_1       0x20202020
  40 #define CMD_BLOCK_ERASE_2       0xd0d0d0d0
  41 #define CMD_BYTE_WRITE          0x40404040
  42 #define CMD_SUSPEND             0xb0b0b0b0
  43 #define CMD_RESUME              0xd0d0d0d0
  44 #define CMD_SET_BLOCK_LOCK_1    0x60606060
  45 #define CMD_SET_BLOCK_LOCK_2    0x01010101
  46 #define CMD_SET_MASTER_LOCK_1   0x60606060
  47 #define CMD_SET_MASTER_LOCK_2   0xf1f1f1f1
  48 #define CMD_CLEAR_BLOCK_LOCKS_1 0x60606060
  49 #define CMD_CLEAR_BLOCK_LOCKS_2 0xd0d0d0d0
  50
  51 #define SR_READY                0x80808080 // 1 = ready
  52 #define SR_ERASE_SUSPEND        0x40404040 // 1 = block erase suspended
  53 #define SR_ERROR_ERASE          0x20202020 // 1 = error in block erase or clear lock bits
  54 #define SR_ERROR_WRITE          0x10101010 // 1 = error in byte write or set lock bit
  55 #define SR_VPP                  0x08080808 // 1 = Vpp is low
  56 #define SR_WRITE_SUSPEND        0x04040404 // 1 = byte write suspended
  57 #define SR_PROTECT              0x02020202 // 1 = lock bit set
  58 #define SR_RESERVED             0x01010101
  59
  60 #define SR_ERRORS (SR_ERROR_ERASE|SR_ERROR_WRITE|SR_VPP|SR_PROTECT)
  61
  62 /* Configuration options */
  63
  64 #undef AUTOUNLOCK  /* automatically unlocks blocks before erasing */
  65
  66 struct mtd_info *sharp_probe(struct map_info *);
  67
  68 static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd);
  69
  70 static int sharp_read(struct mtd_info *mtd, loff_t from, size_t len,
  71         size_t *retlen, u_char *buf);
  72 static int sharp_write(struct mtd_info *mtd, loff_t from, size_t len,
  73         size_t *retlen, const u_char *buf);
  74 static int sharp_erase(struct mtd_info *mtd, struct erase_info *instr);
  75 static void sharp_sync(struct mtd_info *mtd);
  76 static int sharp_suspend(struct mtd_info *mtd);
  77 static void sharp_resume(struct mtd_info *mtd);
  78 static void sharp_destroy(struct mtd_info *mtd);
  79
  80 static int sharp_write_oneword(struct map_info *map, struct flchip *chip,
  81         unsigned long adr, __u32 datum);
  82 static int sharp_erase_oneblock(struct map_info *map, struct flchip *chip,
  83         unsigned long adr);
  84 #ifdef AUTOUNLOCK
  85 static void sharp_unlock_oneblock(struct map_info *map, struct flchip *chip,
  86         unsigned long adr);
  87 #endif
  88
  89
  90 struct sharp_info{
  91         struct flchip *chip;
  92         int bogus;
  93         int chipshift;
  94         int numchips;
  95         struct flchip chips[1];
  96 };
  97
  98 struct mtd_info *sharp_probe(struct map_info *map);
  99 static void sharp_destroy(struct mtd_info *mtd);
 100
 101 static struct mtd_chip_driver sharp_chipdrv = {
 102         .probe          = sharp_probe,
 103         .destroy        = sharp_destroy,
 104         .name           = "sharp",
 105         .module         = THIS_MODULE
 106 };
 107
 108
 109 struct mtd_info *sharp_probe(struct map_info *map)
 110 {
 111         struct mtd_info *mtd = NULL;
 112         struct sharp_info *sharp = NULL;
 113         int width;
 114
 115         mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
 116         if(!mtd)
 117                 return NULL;
 118
 119         sharp = kmalloc(sizeof(*sharp), GFP_KERNEL);
 120         if(!sharp) {
 121                 kfree(mtd);
 122                 return NULL;
 123         }
 124
 125         memset(mtd, 0, sizeof(*mtd));
 126
 127         width = sharp_probe_map(map,mtd);
 128         if(!width){
 129                 kfree(mtd);
 130                 kfree(sharp);
 131                 return NULL;
 132         }
 133
 134         mtd->priv = map;
 135         mtd->type = MTD_NORFLASH;
 136         mtd->erase = sharp_erase;
 137         mtd->read = sharp_read;
 138         mtd->write = sharp_write;
 139         mtd->sync = sharp_sync;
 140         mtd->suspend = sharp_suspend;
 141         mtd->resume = sharp_resume;
 142         mtd->flags = MTD_CAP_NORFLASH;
 143         mtd->name = map->name;
 144
 145         memset(sharp, 0, sizeof(*sharp));
 146         sharp->chipshift = 23;
 147         sharp->numchips = 1;
 148         sharp->chips[0].start = 0;
 149         sharp->chips[0].state = FL_READY;
 150         sharp->chips[0].mutex = &sharp->chips[0]._spinlock;
 151         sharp->chips[0].word_write_time = 0;
 152         init_waitqueue_head(&sharp->chips[0].wq);
 153         spin_lock_init(&sharp->chips[0]._spinlock);
 154
 155         map->fldrv = &sharp_chipdrv;
 156         map->fldrv_priv = sharp;
 157
 158         __module_get(THIS_MODULE);
 159         return mtd;
 160 }
 161
 162 static int sharp_probe_map(struct map_info *map,struct mtd_info *mtd)
 163 {
 164         unsigned long tmp;
 165         unsigned long base = 0;
 166         u32 read0, read4;
 167         int width = 4;
 168
 169         tmp = map_read32(map, base+0);
 170
 171         map_write32(map, CMD_READ_ID, base+0);
 172
 173         read0=map_read32(map, base+0);
 174         read4=map_read32(map, base+4);
 175         if(read0 == 0x89898989){
 176                 printk("Looks like sharp flash\n");
 177                 switch(read4){
 178                 case 0xaaaaaaaa:
 179                 case 0xa0a0a0a0:
 180                         /* aa - LH28F016SCT-L95 2Mx8, 32 64k blocks*/
 181                         /* a0 - LH28F016SCT-Z4  2Mx8, 32 64k blocks*/
 182                         mtd->erasesize = 0x10000 * width;
 183                         mtd->size = 0x200000 * width;
 184                         return width;
 185                 case 0xa6a6a6a6:
 186                         /* a6 - LH28F008SCT-L12 1Mx8, 16 64k blocks*/
 187                         /* a6 - LH28F008SCR-L85 1Mx8, 16 64k blocks*/
 188                         mtd->erasesize = 0x10000 * width;
 189                         mtd->size = 0x100000 * width;
 190                         return width;
 191 #if 0
 192                 case 0x00000000: /* unknown */
 193                         /* XX - LH28F004SCT 512kx8, 8 64k blocks*/
 194                         mtd->erasesize = 0x10000 * width;
 195                         mtd->size = 0x80000 * width;
 196                         return width;
 197 #endif
 198                 default:
 199                         printk("Sort-of looks like sharp flash, 0x%08x 0x%08x\n",
 200                                 read0,read4);
 201                 }
 202         }else if((map_read32(map, base+0) == CMD_READ_ID)){
 203                 /* RAM, probably */
 204                 printk("Looks like RAM\n");
 205                 map_write32(map, tmp, base+0);
 206         }else{
 207                 printk("Doesn't look like sharp flash, 0x%08x 0x%08x\n",
 208                         read0,read4);
 209         }
 210
 211         return 0;
 212 }
 213
 214 /* This function returns with the chip->mutex lock held. */
 215 static int sharp_wait(struct map_info *map, struct flchip *chip)
 216 {
 217         __u16 status;
 218         unsigned long timeo = jiffies + HZ;
 219         DECLARE_WAITQUEUE(wait, current);
 220         int adr = 0;
 221
 222 retry:
 223         spin_lock_bh(chip->mutex);
 224
 225         switch(chip->state){
 226         case FL_READY:
 227                 map_write32(map,CMD_READ_STATUS,adr);
 228                 chip->state = FL_STATUS;
 229         case FL_STATUS:
 230                 status = map_read32(map,adr);
 231 //printk("status=%08x\n",status);
 232
 233                 udelay(100);
 234                 if((status & SR_READY)!=SR_READY){
 235 //printk(".status=%08x\n",status);
 236                         udelay(100);
 237                 }
 238                 break;
 239         default:
 240                 printk("Waiting for chip\n");
 241
 242                 set_current_state(TASK_INTERRUPTIBLE);
 243                 add_wait_queue(&chip->wq, &wait);
 244
 245                 spin_unlock_bh(chip->mutex);
 246
 247                 schedule();
 248                 remove_wait_queue(&chip->wq, &wait);
 249
 250                 if(signal_pending(current))
 251                         return -EINTR;
 252
 253                 timeo = jiffies + HZ;
 254
 255                 goto retry;
 256         }
 257
 258         map_write32(map,CMD_RESET, adr);
 259
 260         chip->state = FL_READY;
 261
 262         return 0;
 263 }
 264
 265 static void sharp_release(struct flchip *chip)
 266 {
 267         wake_up(&chip->wq);
 268         spin_unlock_bh(chip->mutex);
 269 }
 270
 271 static int sharp_read(struct mtd_info *mtd, loff_t from, size_t len,
 272         size_t *retlen, u_char *buf)
 273 {
 274         struct map_info *map = mtd->priv;
 275         struct sharp_info *sharp = map->fldrv_priv;
 276         int chipnum;
 277         int ret = 0;
 278         int ofs = 0;
 279
 280         chipnum = (from >> sharp->chipshift);
 281         ofs = from & ((1 << sharp->chipshift)-1);
 282
 283         *retlen = 0;
 284
 285         while(len){
 286                 unsigned long thislen;
 287
 288                 if(chipnum>=sharp->numchips)
 289                         break;
 290
 291                 thislen = len;
 292                 if(ofs+thislen >= (1<<sharp->chipshift))
 293                         thislen = (1<<sharp->chipshift) - ofs;
 294
 295                 ret = sharp_wait(map,&sharp->chips[chipnum]);
 296                 if(ret<0)
 297                         break;
 298
 299                 map_copy_from(map,buf,ofs,thislen);
 300
 301                 sharp_release(&sharp->chips[chipnum]);
 302
 303                 *retlen += thislen;
 304                 len -= thislen;
 305                 buf += thislen;
 306
 307                 ofs = 0;
 308                 chipnum++;
 309         }
 310         return ret;
 311 }
 312
 313 static int sharp_write(struct mtd_info *mtd, loff_t to, size_t len,
 314         size_t *retlen, const u_char *buf)
 315 {
 316         struct map_info *map = mtd->priv;
 317         struct sharp_info *sharp = map->fldrv_priv;
 318         int ret = 0;
 319         int i,j;
 320         int chipnum;
 321         unsigned long ofs;
 322         union { u32 l; unsigned char uc[4]; } tbuf;
 323
 324         *retlen = 0;
 325
 326         while(len){
 327                 tbuf.l = 0xffffffff;
 328                 chipnum = to >> sharp->chipshift;
 329                 ofs = to & ((1<<sharp->chipshift)-1);
 330
 331                 j=0;
 332                 for(i=ofs&3;i<4 && len;i++){
 333                         tbuf.uc[i] = *buf;
 334                         buf++;
 335                         to++;
 336                         len--;
 337                         j++;
 338                 }
 339                 sharp_write_oneword(map, &sharp->chips[chipnum], ofs&~3, tbuf.l);
 340                 if(ret<0)
 341                         return ret;
 342                 (*retlen)+=j;
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int sharp_write_oneword(struct map_info *map, struct flchip *chip,
 349         unsigned long adr, __u32 datum)
 350 {
 351         int ret;
 352         int timeo;
 353         int try;
 354         int i;
 355         int status = 0;
 356
 357         ret = sharp_wait(map,chip);
 358
 359         for(try=0;try<10;try++){
 360                 map_write32(map,CMD_BYTE_WRITE,adr);
 361                 /* cpu_to_le32 -> hack to fix the writel be->le conversion */
 362                 map_write32(map,cpu_to_le32(datum),adr);
 363
 364                 chip->state = FL_WRITING;
 365
 366                 timeo = jiffies + (HZ/2);
 367
 368                 map_write32(map,CMD_READ_STATUS,adr);
 369                 for(i=0;i<100;i++){
 370                         status = map_read32(map,adr);
 371                         if((status & SR_READY)==SR_READY)
 372                                 break;
 373                 }
 374                 if(i==100){
 375                         printk("sharp: timed out writing\n");
 376                 }
 377
 378                 if(!(status&SR_ERRORS))
 379                         break;
 380
 381                 printk("sharp: error writing byte at addr=%08lx status=%08x\n",adr,status);
 382
 383                 map_write32(map,CMD_CLEAR_STATUS,adr);
 384         }
 385         map_write32(map,CMD_RESET,adr);
 386         chip->state = FL_READY;
 387
 388         wake_up(&chip->wq);
 389         spin_unlock_bh(chip->mutex);
 390
 391         return 0;
 392 }
 393
 394 static int sharp_erase(struct mtd_info *mtd, struct erase_info *instr)
 395 {
 396         struct map_info *map = mtd->priv;
 397         struct sharp_info *sharp = map->fldrv_priv;
 398         unsigned long adr,len;
 399         int chipnum, ret=0;
 400
 401 //printk("sharp_erase()\n");
 402         if(instr->addr & (mtd->erasesize - 1))
 403                 return -EINVAL;
 404         if(instr->len & (mtd->erasesize - 1))
 405                 return -EINVAL;
 406         if(instr->len + instr->addr > mtd->size)
 407                 return -EINVAL;
 408
 409         chipnum = instr->addr >> sharp->chipshift;
 410         adr = instr->addr & ((1<<sharp->chipshift)-1);
 411         len = instr->len;
 412
 413         while(len){
 414                 ret = sharp_erase_oneblock(map, &sharp->chips[chipnum], adr);
 415                 if(ret)return ret;
 416
 417                 adr += mtd->erasesize;
 418                 len -= mtd->erasesize;
 419                 if(adr >> sharp->chipshift){
 420                         adr = 0;
 421                         chipnum++;
 422                         if(chipnum>=sharp->numchips)
 423                                 break;
 424                 }
 425         }
 426
 427         instr->state = MTD_ERASE_DONE;
 428         if(instr->callback)
 429                 instr->callback(instr);
 430
 431         return 0;
 432 }
 433
 434 static int sharp_do_wait_for_ready(struct map_info *map, struct flchip *chip,
 435         unsigned long adr)
 436 {
 437         int ret;
 438         unsigned long timeo;
 439         int status;
 440         DECLARE_WAITQUEUE(wait, current);
 441
 442         map_write32(map,CMD_READ_STATUS,adr);
 443         status = map_read32(map,adr);
 444
 445         timeo = jiffies + HZ;
 446
 447         while(time_before(jiffies, timeo)){
 448                 map_write32(map,CMD_READ_STATUS,adr);
 449                 status = map_read32(map,adr);
 450                 if((status & SR_READY)==SR_READY){
 451                         ret = 0;
 452                         goto out;
 453                 }
 454                 set_current_state(TASK_INTERRUPTIBLE);
 455                 add_wait_queue(&chip->wq, &wait);
 456
 457                 //spin_unlock_bh(chip->mutex);
 458
 459                 schedule_timeout(1);
 460                 schedule();
 461                 remove_wait_queue(&chip->wq, &wait);
 462
 463                 //spin_lock_bh(chip->mutex);
 464
 465                 if (signal_pending(current)){
 466                         ret = -EINTR;
 467                         goto out;
 468                 }
 469
 470         }
 471         ret = -ETIME;
 472 out:
 473         return ret;
 474 }
 475
 476 static int sharp_erase_oneblock(struct map_info *map, struct flchip *chip,
 477         unsigned long adr)
 478 {
 479         int ret;
 480         //int timeo;
 481         int status;
 482         //int i;
 483
 484 //printk("sharp_erase_oneblock()\n");
 485
 486 #ifdef AUTOUNLOCK
 487         /* This seems like a good place to do an unlock */
 488         sharp_unlock_oneblock(map,chip,adr);
 489 #endif
 490
 491         map_write32(map,CMD_BLOCK_ERASE_1,adr);
 492         map_write32(map,CMD_BLOCK_ERASE_2,adr);
 493
 494         chip->state = FL_ERASING;
 495
 496         ret = sharp_do_wait_for_ready(map,chip,adr);
 497         if(ret<0)return ret;
 498
 499         map_write32(map,CMD_READ_STATUS,adr);
 500         status = map_read32(map,adr);
 501
 502         if(!(status&SR_ERRORS)){
 503                 map_write32(map,CMD_RESET,adr);
 504                 chip->state = FL_READY;
 505                 //spin_unlock_bh(chip->mutex);
 506                 return 0;
 507         }
 508
 509         printk("sharp: error erasing block at addr=%08lx status=%08x\n",adr,status);
 510         map_write32(map,CMD_CLEAR_STATUS,adr);
 511
 512         //spin_unlock_bh(chip->mutex);
 513
 514         return -EIO;
 515 }
 516
 517 #ifdef AUTOUNLOCK
 518 static void sharp_unlock_oneblock(struct map_info *map, struct flchip *chip,
 519         unsigned long adr)
 520 {
 521         int i;
 522         int status;
 523
 524         map_write32(map,CMD_CLEAR_BLOCK_LOCKS_1,adr);
 525         map_write32(map,CMD_CLEAR_BLOCK_LOCKS_2,adr);
 526
 527         udelay(100);
 528
 529         status = map_read32(map,adr);
 530         printk("status=%08x\n",status);
 531
 532         for(i=0;i<1000;i++){
 533                 //map_write32(map,CMD_READ_STATUS,adr);
 534                 status = map_read32(map,adr);
 535                 if((status & SR_READY)==SR_READY)
 536                         break;
 537                 udelay(100);
 538         }
 539         if(i==1000){
 540                 printk("sharp: timed out unlocking block\n");
 541         }
 542
 543         if(!(status&SR_ERRORS)){
 544                 map_write32(map,CMD_RESET,adr);
 545                 chip->state = FL_READY;
 546                 return;
 547         }
 548
 549         printk("sharp: error unlocking block at addr=%08lx status=%08x\n",adr,status);
 550         map_write32(map,CMD_CLEAR_STATUS,adr);
 551 }
 552 #endif
 553
 554 static void sharp_sync(struct mtd_info *mtd)
 555 {
 556         //printk("sharp_sync()\n");
 557 }
 558
 559 static int sharp_suspend(struct mtd_info *mtd)
 560 {
 561         printk("sharp_suspend()\n");
 562         return -EINVAL;
 563 }
 564
 565 static void sharp_resume(struct mtd_info *mtd)
 566 {
 567         printk("sharp_resume()\n");
 568
 569 }
 570
 571 static void sharp_destroy(struct mtd_info *mtd)
 572 {
 573         printk("sharp_destroy()\n");
 574
 575 }
 576
 577 int __init sharp_probe_init(void)
 578 {
 579         printk("MTD Sharp chip driver <ds@lineo.com>\n");
 580
 581         register_mtd_chip_driver(&sharp_chipdrv);
 582
 583         return 0;
 584 }
 585
 586 static void __exit sharp_probe_exit(void)
 587 {
 588         unregister_mtd_chip_driver(&sharp_chipdrv);
 589 }
 590
 591 module_init(sharp_probe_init);
 592 module_exit(sharp_probe_exit);
 593
 594
 595 MODULE_LICENSE("GPL");
 596 MODULE_AUTHOR("David Schleef <ds@schleef.org>");
 597 MODULE_DESCRIPTION("Old MTD chip driver for pre-CFI Sharp flash chips");