2 * Driver for Disk-On-Chip 2000 and Millennium
3 * (c) 1999 Machine Vision Holdings, Inc.
4 * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org>
6 * $Id: doc2000.c,v 1.46 2001/10/02 15:05:13 dwmw2 Exp $
14 #include <linux/mtd/nftl.h>
15 #include <linux/mtd/doc2000.h>
17 #ifdef CFG_DOC_SUPPORT_2000
18 #define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k)
20 #define DoC_is_2000(doc) (0)
23 #ifdef CFG_DOC_SUPPORT_MILLENNIUM
24 #define DoC_is_Millennium(doc) (doc->ChipID == DOC_ChipID_DocMil)
26 #define DoC_is_Millennium(doc) (0)
29 /* CFG_DOC_PASSIVE_PROBE:
30 In order to ensure that the BIOS checksum is correct at boot time, and
31 hence that the onboard BIOS extension gets executed, the DiskOnChip
32 goes into reset mode when it is read sequentially: all registers
33 return 0xff until the chip is woken up again by writing to the
36 Unfortunately, this means that the probe for the DiskOnChip is unsafe,
37 because one of the first things it does is write to where it thinks
38 the DOCControl register should be - which may well be shared memory
39 for another device. I've had machines which lock up when this is
40 attempted. Hence the possibility to do a passive probe, which will fail
41 to detect a chip in reset mode, but is at least guaranteed not to lock
44 If you have this problem, uncomment the following line:
45 #define CFG_DOC_PASSIVE_PROBE
53 static struct DiskOnChip doc_dev_desc[CFG_MAX_DOC_DEVICE];
55 /* Current DOC Device */
56 static int curr_device = -1;
58 /* Supported NAND flash devices */
59 static struct nand_flash_dev nand_flash_ids[] = {
60 {"Toshiba TC5816BDC", NAND_MFR_TOSHIBA, 0x64, 21, 1, 2, 0x1000, 0},
61 {"Toshiba TC5832DC", NAND_MFR_TOSHIBA, 0x6b, 22, 0, 2, 0x2000, 0},
62 {"Toshiba TH58V128DC", NAND_MFR_TOSHIBA, 0x73, 24, 0, 2, 0x4000, 0},
63 {"Toshiba TC58256FT/DC", NAND_MFR_TOSHIBA, 0x75, 25, 0, 2, 0x4000, 0},
64 {"Toshiba TH58512FT", NAND_MFR_TOSHIBA, 0x76, 26, 0, 3, 0x4000, 0},
65 {"Toshiba TC58V32DC", NAND_MFR_TOSHIBA, 0xe5, 22, 0, 2, 0x2000, 0},
66 {"Toshiba TC58V64AFT/DC", NAND_MFR_TOSHIBA, 0xe6, 23, 0, 2, 0x2000, 0},
67 {"Toshiba TC58V16BDC", NAND_MFR_TOSHIBA, 0xea, 21, 1, 2, 0x1000, 0},
68 {"Toshiba TH58100FT", NAND_MFR_TOSHIBA, 0x79, 27, 0, 3, 0x4000, 0},
69 {"Samsung KM29N16000", NAND_MFR_SAMSUNG, 0x64, 21, 1, 2, 0x1000, 0},
70 {"Samsung unknown 4Mb", NAND_MFR_SAMSUNG, 0x6b, 22, 0, 2, 0x2000, 0},
71 {"Samsung KM29U128T", NAND_MFR_SAMSUNG, 0x73, 24, 0, 2, 0x4000, 0},
72 {"Samsung KM29U256T", NAND_MFR_SAMSUNG, 0x75, 25, 0, 2, 0x4000, 0},
73 {"Samsung unknown 64Mb", NAND_MFR_SAMSUNG, 0x76, 26, 0, 3, 0x4000, 0},
74 {"Samsung KM29W32000", NAND_MFR_SAMSUNG, 0xe3, 22, 0, 2, 0x2000, 0},
75 {"Samsung unknown 4Mb", NAND_MFR_SAMSUNG, 0xe5, 22, 0, 2, 0x2000, 0},
76 {"Samsung KM29U64000", NAND_MFR_SAMSUNG, 0xe6, 23, 0, 2, 0x2000, 0},
77 {"Samsung KM29W16000", NAND_MFR_SAMSUNG, 0xea, 21, 1, 2, 0x1000, 0},
78 {"Samsung K9F5616Q0C", NAND_MFR_SAMSUNG, 0x45, 25, 0, 2, 0x4000, 1},
79 {"Samsung K9K1216Q0C", NAND_MFR_SAMSUNG, 0x46, 26, 0, 3, 0x4000, 1},
80 {"Samsung K9F1G08U0M", NAND_MFR_SAMSUNG, 0xf1, 27, 0, 2, 0, 0},
84 /* ------------------------------------------------------------------------- */
86 int do_doc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
93 printf ("Usage:\n%s\n", cmdtp->usage);
96 if (strcmp(argv[1],"info") == 0) {
101 for (i=0; i<CFG_MAX_DOC_DEVICE; ++i) {
102 if(doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN)
103 continue; /* list only known devices */
104 printf ("Device %d: ", i);
105 doc_print(&doc_dev_desc[i]);
109 } else if (strcmp(argv[1],"device") == 0) {
110 if ((curr_device < 0) || (curr_device >= CFG_MAX_DOC_DEVICE)) {
111 puts ("\nno devices available\n");
114 printf ("\nDevice %d: ", curr_device);
115 doc_print(&doc_dev_desc[curr_device]);
118 printf ("Usage:\n%s\n", cmdtp->usage);
121 if (strcmp(argv[1],"device") == 0) {
122 int dev = (int)simple_strtoul(argv[2], NULL, 10);
124 printf ("\nDevice %d: ", dev);
125 if (dev >= CFG_MAX_DOC_DEVICE) {
126 puts ("unknown device\n");
129 doc_print(&doc_dev_desc[dev]);
132 if (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN) {
138 puts ("... is now current device\n");
143 printf ("Usage:\n%s\n", cmdtp->usage);
146 /* at least 4 args */
148 if (strcmp(argv[1],"read") == 0 || strcmp(argv[1],"write") == 0) {
149 ulong addr = simple_strtoul(argv[2], NULL, 16);
150 ulong off = simple_strtoul(argv[3], NULL, 16);
151 ulong size = simple_strtoul(argv[4], NULL, 16);
152 int cmd = (strcmp(argv[1],"read") == 0);
155 printf ("\nDOC %s: device %d offset %ld, size %ld ... ",
156 cmd ? "read" : "write", curr_device, off, size);
158 ret = doc_rw(doc_dev_desc + curr_device, cmd, off, size,
159 (size_t *)&total, (u_char*)addr);
161 printf ("%d bytes %s: %s\n", total, cmd ? "read" : "write",
162 ret ? "ERROR" : "OK");
165 } else if (strcmp(argv[1],"erase") == 0) {
166 ulong off = simple_strtoul(argv[2], NULL, 16);
167 ulong size = simple_strtoul(argv[3], NULL, 16);
170 printf ("\nDOC erase: device %d offset %ld, size %ld ... ",
171 curr_device, off, size);
173 ret = doc_erase (doc_dev_desc + curr_device, off, size);
175 printf("%s\n", ret ? "ERROR" : "OK");
179 printf ("Usage:\n%s\n", cmdtp->usage);
188 "doc - Disk-On-Chip sub-system\n",
189 "info - show available DOC devices\n"
190 "doc device [dev] - show or set current device\n"
191 "doc read addr off size\n"
192 "doc write addr off size - read/write `size'"
193 " bytes starting at offset `off'\n"
194 " to/from memory address `addr'\n"
195 "doc erase off size - erase `size' bytes of DOC from offset `off'\n"
198 int do_docboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
200 char *boot_device = NULL;
208 #if defined(CONFIG_FIT)
212 show_boot_progress (34);
215 addr = CFG_LOAD_ADDR;
216 boot_device = getenv ("bootdevice");
219 addr = simple_strtoul(argv[1], NULL, 16);
220 boot_device = getenv ("bootdevice");
223 addr = simple_strtoul(argv[1], NULL, 16);
224 boot_device = argv[2];
227 addr = simple_strtoul(argv[1], NULL, 16);
228 boot_device = argv[2];
229 offset = simple_strtoul(argv[3], NULL, 16);
232 printf ("Usage:\n%s\n", cmdtp->usage);
233 show_boot_progress (-35);
237 show_boot_progress (35);
239 puts ("\n** No boot device **\n");
240 show_boot_progress (-36);
243 show_boot_progress (36);
245 dev = simple_strtoul(boot_device, &ep, 16);
247 if ((dev >= CFG_MAX_DOC_DEVICE) ||
248 (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN)) {
249 printf ("\n** Device %d not available\n", dev);
250 show_boot_progress (-37);
253 show_boot_progress (37);
255 printf ("\nLoading from device %d: %s at 0x%lX (offset 0x%lX)\n",
256 dev, doc_dev_desc[dev].name, doc_dev_desc[dev].physadr,
259 if (doc_rw (doc_dev_desc + dev, 1, offset,
260 SECTORSIZE, NULL, (u_char *)addr)) {
261 printf ("** Read error on %d\n", dev);
262 show_boot_progress (-38);
265 show_boot_progress (38);
267 switch (genimg_get_format ((void *)addr)) {
268 case IMAGE_FORMAT_LEGACY:
269 hdr = (image_header_t *)addr;
271 image_print_contents (hdr);
273 cnt = image_get_image_size (hdr);
275 #if defined(CONFIG_FIT)
276 case IMAGE_FORMAT_FIT:
277 fit_hdr = (const void *)addr;
278 if (!fit_check_format (fit_hdr)) {
279 show_boot_progress (-130);
280 puts ("** Bad FIT image format\n");
283 show_boot_progress (131);
284 puts ("Fit image detected...\n");
286 cnt = fit_get_size (fit_hdr);
290 show_boot_progress (-39);
291 puts ("** Unknown image type\n");
294 show_boot_progress (39);
297 if (doc_rw (doc_dev_desc + dev, 1, offset + SECTORSIZE, cnt,
298 NULL, (u_char *)(addr+SECTORSIZE))) {
299 printf ("** Read error on %d\n", dev);
300 show_boot_progress (-40);
303 show_boot_progress (40);
305 #if defined(CONFIG_FIT)
306 /* This cannot be done earlier, we need complete FIT image in RAM first */
307 if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT)
308 fit_print_contents ((const void *)addr);
311 /* Loading ok, update default load address */
315 /* Check if we should attempt an auto-start */
316 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
318 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
320 local_args[0] = argv[0];
321 local_args[1] = NULL;
323 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
325 do_bootm (cmdtp, 0, 1, local_args);
332 docboot, 4, 1, do_docboot,
333 "docboot - boot from DOC device\n",
337 int doc_rw (struct DiskOnChip* this, int cmd,
338 loff_t from, size_t len,
339 size_t * retlen, u_char * buf)
341 int noecc, ret = 0, n, total = 0;
345 /* The ECC will not be calculated correctly if
346 less than 512 is written or read */
347 noecc = (from != (from | 0x1ff) + 1) || (len < 0x200);
350 ret = doc_read_ecc(this, from, len,
351 (size_t *)&n, (u_char*)buf,
352 noecc ? (uchar *)NULL : (uchar *)eccbuf);
354 ret = doc_write_ecc(this, from, len,
355 (size_t *)&n, (u_char*)buf,
356 noecc ? (uchar *)NULL : (uchar *)eccbuf);
373 void doc_print(struct DiskOnChip *this) {
374 printf("%s at 0x%lX,\n"
375 "\t %d chip%s %s, size %d MB, \n"
376 "\t total size %ld MB, sector size %ld kB\n",
377 this->name, this->physadr, this->numchips,
378 this->numchips>1 ? "s" : "", this->chips_name,
379 1 << (this->chipshift - 20),
380 this->totlen >> 20, this->erasesize >> 10);
382 if (this->nftl_found) {
383 struct NFTLrecord *nftl = &this->nftl;
384 unsigned long bin_size, flash_size;
386 bin_size = nftl->nb_boot_blocks * this->erasesize;
387 flash_size = (nftl->nb_blocks - nftl->nb_boot_blocks) * this->erasesize;
389 printf("\t NFTL boot record:\n"
390 "\t Binary partition: size %ld%s\n"
391 "\t Flash disk partition: size %ld%s, offset 0x%lx\n",
392 bin_size > (1 << 20) ? bin_size >> 20 : bin_size >> 10,
393 bin_size > (1 << 20) ? "MB" : "kB",
394 flash_size > (1 << 20) ? flash_size >> 20 : flash_size >> 10,
395 flash_size > (1 << 20) ? "MB" : "kB", bin_size);
397 puts ("\t No NFTL boot record found.\n");
401 /* ------------------------------------------------------------------------- */
403 /* This function is needed to avoid calls of the __ashrdi3 function. */
404 static int shr(int val, int shift) {
408 /* Perform the required delay cycles by reading from the appropriate register */
409 static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles)
414 for (i = 0; i < cycles; i++) {
415 if (DoC_is_Millennium(doc))
416 dummy = ReadDOC(doc->virtadr, NOP);
418 dummy = ReadDOC(doc->virtadr, DOCStatus);
423 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
424 static int _DoC_WaitReady(struct DiskOnChip *doc)
426 unsigned long docptr = doc->virtadr;
427 unsigned long start = get_timer(0);
430 puts ("_DoC_WaitReady called for out-of-line wait\n");
433 /* Out-of-line routine to wait for chip response */
434 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
435 #ifdef CFG_DOC_SHORT_TIMEOUT
436 /* it seems that after a certain time the DoC deasserts
437 * the CDSN_CTRL_FR_B although it is not ready...
438 * using a short timout solve this (timer increments every ms) */
439 if (get_timer(start) > 10) {
443 if (get_timer(start) > 10 * 1000) {
444 puts ("_DoC_WaitReady timed out.\n");
454 static int DoC_WaitReady(struct DiskOnChip *doc)
456 unsigned long docptr = doc->virtadr;
457 /* This is inline, to optimise the common case, where it's ready instantly */
460 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
461 see Software Requirement 11.4 item 2. */
464 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
465 /* Call the out-of-line routine to wait */
466 ret = _DoC_WaitReady(doc);
468 /* issue 2 read from NOP register after reading from CDSNControl register
469 see Software Requirement 11.4 item 2. */
475 /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to
476 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
477 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
479 static inline int DoC_Command(struct DiskOnChip *doc, unsigned char command,
480 unsigned char xtraflags)
482 unsigned long docptr = doc->virtadr;
484 if (DoC_is_2000(doc))
485 xtraflags |= CDSN_CTRL_FLASH_IO;
487 /* Assert the CLE (Command Latch Enable) line to the flash chip */
488 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
489 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
491 if (DoC_is_Millennium(doc))
492 WriteDOC(command, docptr, CDSNSlowIO);
494 /* Send the command */
495 WriteDOC_(command, docptr, doc->ioreg);
497 /* Lower the CLE line */
498 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
499 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
501 /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */
502 return DoC_WaitReady(doc);
505 /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to
506 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
507 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
509 static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs,
510 unsigned char xtraflags1, unsigned char xtraflags2)
512 unsigned long docptr;
515 docptr = doc->virtadr;
517 if (DoC_is_2000(doc))
518 xtraflags1 |= CDSN_CTRL_FLASH_IO;
520 /* Assert the ALE (Address Latch Enable) line to the flash chip */
521 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
523 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
525 /* Send the address */
526 /* Devices with 256-byte page are addressed as:
527 Column (bits 0-7), Page (bits 8-15, 16-23, 24-31)
528 * there is no device on the market with page256
529 and more than 24 bits.
530 Devices with 512-byte page are addressed as:
531 Column (bits 0-7), Page (bits 9-16, 17-24, 25-31)
532 * 25-31 is sent only if the chip support it.
533 * bit 8 changes the read command to be sent
534 (NAND_CMD_READ0 or NAND_CMD_READ1).
537 if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) {
538 if (DoC_is_Millennium(doc))
539 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
540 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
549 if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) {
550 for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) {
551 if (DoC_is_Millennium(doc))
552 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
553 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
557 DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */
559 /* FIXME: The SlowIO's for millennium could be replaced by
560 a single WritePipeTerm here. mf. */
562 /* Lower the ALE line */
563 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr,
566 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
568 /* Wait for the chip to respond - Software requirement 11.4.1 */
569 return DoC_WaitReady(doc);
572 /* Read a buffer from DoC, taking care of Millennium oddities */
573 static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len)
576 int modulus = 0xffff;
577 unsigned long docptr;
580 docptr = doc->virtadr;
585 if (DoC_is_Millennium(doc)) {
586 /* Read the data via the internal pipeline through CDSN IO register,
587 see Pipelined Read Operations 11.3 */
588 dummy = ReadDOC(docptr, ReadPipeInit);
590 /* Millennium should use the LastDataRead register - Pipeline Reads */
593 /* This is needed for correctly ECC calculation */
597 for (i = 0; i < len; i++)
598 buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus));
600 if (DoC_is_Millennium(doc)) {
601 buf[i] = ReadDOC(docptr, LastDataRead);
605 /* Write a buffer to DoC, taking care of Millennium oddities */
606 static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len)
608 unsigned long docptr;
611 docptr = doc->virtadr;
616 for (i = 0; i < len; i++)
617 WriteDOC_(buf[i], docptr, doc->ioreg + i);
619 if (DoC_is_Millennium(doc)) {
620 WriteDOC(0x00, docptr, WritePipeTerm);
625 /* DoC_SelectChip: Select a given flash chip within the current floor */
627 static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip)
629 unsigned long docptr = doc->virtadr;
631 /* Software requirement 11.4.4 before writing DeviceSelect */
632 /* Deassert the CE line to eliminate glitches on the FCE# outputs */
633 WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl);
634 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
636 /* Select the individual flash chip requested */
637 WriteDOC(chip, docptr, CDSNDeviceSelect);
640 /* Reassert the CE line */
641 WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr,
643 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
645 /* Wait for it to be ready */
646 return DoC_WaitReady(doc);
649 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
651 static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor)
653 unsigned long docptr = doc->virtadr;
655 /* Select the floor (bank) of chips required */
656 WriteDOC(floor, docptr, FloorSelect);
658 /* Wait for the chip to be ready */
659 return DoC_WaitReady(doc);
662 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
664 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
669 /* Page in the required floor/chip */
670 DoC_SelectFloor(doc, floor);
671 DoC_SelectChip(doc, chip);
674 if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) {
676 printf("DoC_Command (reset) for %d,%d returned true\n",
683 /* Read the NAND chip ID: 1. Send ReadID command */
684 if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
686 printf("DoC_Command (ReadID) for %d,%d returned true\n",
692 /* Read the NAND chip ID: 2. Send address byte zero */
693 DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0);
695 /* Read the manufacturer and device id codes from the device */
697 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
698 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
700 mfr = ReadDOC_(doc->virtadr, doc->ioreg);
702 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
703 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
705 id = ReadDOC_(doc->virtadr, doc->ioreg);
707 /* No response - return failure */
708 if (mfr == 0xff || mfr == 0)
711 /* Check it's the same as the first chip we identified.
712 * M-Systems say that any given DiskOnChip device should only
713 * contain _one_ type of flash part, although that's not a
714 * hardware restriction. */
716 if (doc->mfr == mfr && doc->id == id)
717 return 1; /* This is another the same the first */
719 printf("Flash chip at floor %d, chip %d is different:\n",
723 /* Print and store the manufacturer and ID codes. */
724 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
725 if (mfr == nand_flash_ids[i].manufacture_id &&
726 id == nand_flash_ids[i].model_id) {
728 printf("Flash chip found: Manufacturer ID: %2.2X, "
729 "Chip ID: %2.2X (%s)\n", mfr, id,
730 nand_flash_ids[i].name);
736 nand_flash_ids[i].chipshift;
737 doc->page256 = nand_flash_ids[i].page256;
739 nand_flash_ids[i].pageadrlen;
741 nand_flash_ids[i].erasesize;
743 nand_flash_ids[i].name;
752 /* We haven't fully identified the chip. Print as much as we know. */
753 printf("Unknown flash chip found: %2.2X %2.2X\n",
760 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
762 static void DoC_ScanChips(struct DiskOnChip *this)
765 int numchips[MAX_FLOORS];
766 int maxchips = MAX_CHIPS;
773 if (DoC_is_Millennium(this))
774 maxchips = MAX_CHIPS_MIL;
776 /* For each floor, find the number of valid chips it contains */
777 for (floor = 0; floor < MAX_FLOORS; floor++) {
780 for (chip = 0; chip < maxchips && ret != 0; chip++) {
782 ret = DoC_IdentChip(this, floor, chip);
790 /* If there are none at all that we recognise, bail */
791 if (!this->numchips) {
792 puts ("No flash chips recognised.\n");
796 /* Allocate an array to hold the information for each chip */
797 this->chips = malloc(sizeof(struct Nand) * this->numchips);
799 puts ("No memory for allocating chip info structures\n");
805 /* Fill out the chip array with {floor, chipno} for each
806 * detected chip in the device. */
807 for (floor = 0; floor < MAX_FLOORS; floor++) {
808 for (chip = 0; chip < numchips[floor]; chip++) {
809 this->chips[ret].floor = floor;
810 this->chips[ret].chip = chip;
811 this->chips[ret].curadr = 0;
812 this->chips[ret].curmode = 0x50;
817 /* Calculate and print the total size of the device */
818 this->totlen = this->numchips * (1 << this->chipshift);
821 printf("%d flash chips found. Total DiskOnChip size: %ld MB\n",
822 this->numchips, this->totlen >> 20);
826 /* find_boot_record: Find the NFTL Media Header and its Spare copy which contains the
827 * various device information of the NFTL partition and Bad Unit Table. Update
828 * the ReplUnitTable[] table accroding to the Bad Unit Table. ReplUnitTable[]
829 * is used for management of Erase Unit in other routines in nftl.c and nftlmount.c
831 static int find_boot_record(struct NFTLrecord *nftl)
835 unsigned int block, boot_record_count = 0;
838 struct NFTLMediaHeader *mh = &nftl->MediaHdr;
841 nftl->MediaUnit = BLOCK_NIL;
842 nftl->SpareMediaUnit = BLOCK_NIL;
844 /* search for a valid boot record */
845 for (block = 0; block < nftl->nb_blocks; block++) {
848 /* Check for ANAND header first. Then can whinge if it's found but later
850 if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize, SECTORSIZE,
851 (size_t *)&retlen, buf, NULL))) {
852 static int warncount = 5;
855 printf("Block read at 0x%x failed\n", block * nftl->EraseSize);
857 puts ("Further failures for this block will not be printed\n");
862 if (retlen < 6 || memcmp(buf, "ANAND", 6)) {
863 /* ANAND\0 not found. Continue */
865 printf("ANAND header not found at 0x%x\n", block * nftl->EraseSize);
871 printf("ANAND header found at 0x%x\n", block * nftl->EraseSize);
874 /* To be safer with BIOS, also use erase mark as discriminant */
875 if ((ret = doc_read_oob(nftl->mtd, block * nftl->EraseSize + SECTORSIZE + 8,
876 8, (size_t *)&retlen, (uchar *)&h1) < 0)) {
878 printf("ANAND header found at 0x%x, but OOB data read failed\n",
879 block * nftl->EraseSize);
884 /* OK, we like it. */
886 if (boot_record_count) {
887 /* We've already processed one. So we just check if
888 this one is the same as the first one we found */
889 if (memcmp(mh, buf, sizeof(struct NFTLMediaHeader))) {
891 printf("NFTL Media Headers at 0x%x and 0x%x disagree.\n",
892 nftl->MediaUnit * nftl->EraseSize, block * nftl->EraseSize);
894 /* if (debug) Print both side by side */
897 if (boot_record_count == 1)
898 nftl->SpareMediaUnit = block;
904 /* This is the first we've seen. Copy the media header structure into place */
905 memcpy(mh, buf, sizeof(struct NFTLMediaHeader));
907 /* Do some sanity checks on it */
908 if (mh->UnitSizeFactor == 0) {
910 puts ("UnitSizeFactor 0x00 detected.\n"
911 "This violates the spec but we think we know what it means...\n");
913 } else if (mh->UnitSizeFactor != 0xff) {
914 printf ("Sorry, we don't support UnitSizeFactor "
919 nftl->nb_boot_blocks = le16_to_cpu(mh->FirstPhysicalEUN);
920 if ((nftl->nb_boot_blocks + 2) >= nftl->nb_blocks) {
921 printf ("NFTL Media Header sanity check failed:\n"
922 "nb_boot_blocks (%d) + 2 > nb_blocks (%d)\n",
923 nftl->nb_boot_blocks, nftl->nb_blocks);
927 nftl->numvunits = le32_to_cpu(mh->FormattedSize) / nftl->EraseSize;
928 if (nftl->numvunits > (nftl->nb_blocks - nftl->nb_boot_blocks - 2)) {
929 printf ("NFTL Media Header sanity check failed:\n"
930 "numvunits (%d) > nb_blocks (%d) - nb_boot_blocks(%d) - 2\n",
933 nftl->nb_boot_blocks);
937 nftl->nr_sects = nftl->numvunits * (nftl->EraseSize / SECTORSIZE);
939 /* If we're not using the last sectors in the device for some reason,
940 reduce nb_blocks accordingly so we forget they're there */
941 nftl->nb_blocks = le16_to_cpu(mh->NumEraseUnits) + le16_to_cpu(mh->FirstPhysicalEUN);
943 /* read the Bad Erase Unit Table and modify ReplUnitTable[] accordingly */
944 for (i = 0; i < nftl->nb_blocks; i++) {
945 if ((i & (SECTORSIZE - 1)) == 0) {
946 /* read one sector for every SECTORSIZE of blocks */
947 if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize +
948 i + SECTORSIZE, SECTORSIZE,
949 (size_t *)&retlen, buf, (uchar *)&oob)) < 0) {
950 puts ("Read of bad sector table failed\n");
954 /* mark the Bad Erase Unit as RESERVED in ReplUnitTable */
955 if (buf[i & (SECTORSIZE - 1)] != 0xff)
956 nftl->ReplUnitTable[i] = BLOCK_RESERVED;
959 nftl->MediaUnit = block;
962 } /* foreach (block) */
964 return boot_record_count?0:-1;
967 /* This routine is made available to other mtd code via
968 * inter_module_register. It must only be accessed through
969 * inter_module_get which will bump the use count of this module. The
970 * addresses passed back in mtd are valid as long as the use count of
971 * this module is non-zero, i.e. between inter_module_get and
972 * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000.
974 static void DoC2k_init(struct DiskOnChip* this)
976 struct NFTLrecord *nftl;
978 switch (this->ChipID) {
979 case DOC_ChipID_Doc2k:
980 this->name = "DiskOnChip 2000";
981 this->ioreg = DoC_2k_CDSN_IO;
983 case DOC_ChipID_DocMil:
984 this->name = "DiskOnChip Millennium";
985 this->ioreg = DoC_Mil_CDSN_IO;
990 printf("%s found at address 0x%lX\n", this->name,
1000 /* Ident all the chips present. */
1001 DoC_ScanChips(this);
1002 if ((!this->numchips) || (!this->chips))
1007 /* Get physical parameters */
1008 nftl->EraseSize = this->erasesize;
1009 nftl->nb_blocks = this->totlen / this->erasesize;
1012 if (find_boot_record(nftl) != 0)
1013 this->nftl_found = 0;
1015 this->nftl_found = 1;
1017 printf("%s @ 0x%lX, %ld MB\n", this->name, this->physadr, this->totlen >> 20);
1020 int doc_read_ecc(struct DiskOnChip* this, loff_t from, size_t len,
1021 size_t * retlen, u_char * buf, u_char * eccbuf)
1023 unsigned long docptr;
1024 struct Nand *mychip;
1025 unsigned char syndrome[6];
1026 volatile char dummy;
1027 int i, len256 = 0, ret=0;
1029 docptr = this->virtadr;
1031 /* Don't allow read past end of device */
1032 if (from >= this->totlen) {
1033 puts ("Out of flash\n");
1037 /* Don't allow a single read to cross a 512-byte block boundary */
1038 if (from + len > ((from | 0x1ff) + 1))
1039 len = ((from | 0x1ff) + 1) - from;
1041 /* The ECC will not be calculated correctly if less than 512 is read */
1042 if (len != 0x200 && eccbuf)
1043 printf("ECC needs a full sector read (adr: %lx size %lx)\n",
1044 (long) from, (long) len);
1047 printf("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len);
1050 /* Find the chip which is to be used and select it */
1051 mychip = &this->chips[shr(from, this->chipshift)];
1053 if (this->curfloor != mychip->floor) {
1054 DoC_SelectFloor(this, mychip->floor);
1055 DoC_SelectChip(this, mychip->chip);
1056 } else if (this->curchip != mychip->chip) {
1057 DoC_SelectChip(this, mychip->chip);
1060 this->curfloor = mychip->floor;
1061 this->curchip = mychip->chip;
1065 && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
1067 DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
1071 /* Prime the ECC engine */
1072 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1073 WriteDOC(DOC_ECC_EN, docptr, ECCConf);
1075 /* disable the ECC engine */
1076 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1077 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1080 /* treat crossing 256-byte sector for 2M x 8bits devices */
1081 if (this->page256 && from + len > (from | 0xff) + 1) {
1082 len256 = (from | 0xff) + 1 - from;
1083 DoC_ReadBuf(this, buf, len256);
1085 DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP);
1086 DoC_Address(this, ADDR_COLUMN_PAGE, from + len256,
1087 CDSN_CTRL_WP, CDSN_CTRL_ECC_IO);
1090 DoC_ReadBuf(this, &buf[len256], len - len256);
1092 /* Let the caller know we completed it */
1096 /* Read the ECC data through the DiskOnChip ECC logic */
1097 /* Note: this will work even with 2M x 8bit devices as */
1098 /* they have 8 bytes of OOB per 256 page. mf. */
1099 DoC_ReadBuf(this, eccbuf, 6);
1101 /* Flush the pipeline */
1102 if (DoC_is_Millennium(this)) {
1103 dummy = ReadDOC(docptr, ECCConf);
1104 dummy = ReadDOC(docptr, ECCConf);
1105 i = ReadDOC(docptr, ECCConf);
1107 dummy = ReadDOC(docptr, 2k_ECCStatus);
1108 dummy = ReadDOC(docptr, 2k_ECCStatus);
1109 i = ReadDOC(docptr, 2k_ECCStatus);
1112 /* Check the ECC Status */
1115 /* There was an ECC error */
1117 printf("DiskOnChip ECC Error: Read at %lx\n", (long)from);
1119 /* Read the ECC syndrom through the DiskOnChip ECC logic.
1120 These syndrome will be all ZERO when there is no error */
1121 for (i = 0; i < 6; i++) {
1123 ReadDOC(docptr, ECCSyndrome0 + i);
1125 nb_errors = doc_decode_ecc(buf, syndrome);
1128 printf("Errors corrected: %x\n", nb_errors);
1130 if (nb_errors < 0) {
1131 /* We return error, but have actually done the read. Not that
1132 this can be told to user-space, via sys_read(), but at least
1133 MTD-aware stuff can know about it by checking *retlen */
1134 printf("ECC Errors at %lx\n", (long)from);
1140 printf("ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
1141 (long)from, eccbuf[0], eccbuf[1], eccbuf[2],
1142 eccbuf[3], eccbuf[4], eccbuf[5]);
1145 /* disable the ECC engine */
1146 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
1149 /* according to 11.4.1, we need to wait for the busy line
1150 * drop if we read to the end of the page. */
1151 if(0 == ((from + *retlen) & 0x1ff))
1153 DoC_WaitReady(this);
1159 int doc_write_ecc(struct DiskOnChip* this, loff_t to, size_t len,
1160 size_t * retlen, const u_char * buf,
1163 int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */
1164 unsigned long docptr;
1165 volatile char dummy;
1167 struct Nand *mychip;
1169 docptr = this->virtadr;
1171 /* Don't allow write past end of device */
1172 if (to >= this->totlen) {
1173 puts ("Out of flash\n");
1177 /* Don't allow a single write to cross a 512-byte block boundary */
1178 if (to + len > ((to | 0x1ff) + 1))
1179 len = ((to | 0x1ff) + 1) - to;
1181 /* The ECC will not be calculated correctly if less than 512 is written */
1182 if (len != 0x200 && eccbuf)
1183 printf("ECC needs a full sector write (adr: %lx size %lx)\n",
1184 (long) to, (long) len);
1186 /* printf("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */
1188 /* Find the chip which is to be used and select it */
1189 mychip = &this->chips[shr(to, this->chipshift)];
1191 if (this->curfloor != mychip->floor) {
1192 DoC_SelectFloor(this, mychip->floor);
1193 DoC_SelectChip(this, mychip->chip);
1194 } else if (this->curchip != mychip->chip) {
1195 DoC_SelectChip(this, mychip->chip);
1198 this->curfloor = mychip->floor;
1199 this->curchip = mychip->chip;
1201 /* Set device to main plane of flash */
1202 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1205 && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
1208 DoC_Command(this, NAND_CMD_SEQIN, 0);
1209 DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO);
1212 /* Prime the ECC engine */
1213 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1214 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
1216 /* disable the ECC engine */
1217 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1218 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1221 /* treat crossing 256-byte sector for 2M x 8bits devices */
1222 if (this->page256 && to + len > (to | 0xff) + 1) {
1223 len256 = (to | 0xff) + 1 - to;
1224 DoC_WriteBuf(this, buf, len256);
1226 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1228 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1229 /* There's an implicit DoC_WaitReady() in DoC_Command */
1231 dummy = ReadDOC(docptr, CDSNSlowIO);
1234 if (ReadDOC_(docptr, this->ioreg) & 1) {
1235 puts ("Error programming flash\n");
1236 /* Error in programming */
1241 DoC_Command(this, NAND_CMD_SEQIN, 0);
1242 DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0,
1246 DoC_WriteBuf(this, &buf[len256], len - len256);
1249 WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr,
1252 if (DoC_is_Millennium(this)) {
1253 WriteDOC(0, docptr, NOP);
1254 WriteDOC(0, docptr, NOP);
1255 WriteDOC(0, docptr, NOP);
1257 WriteDOC_(0, docptr, this->ioreg);
1258 WriteDOC_(0, docptr, this->ioreg);
1259 WriteDOC_(0, docptr, this->ioreg);
1262 /* Read the ECC data through the DiskOnChip ECC logic */
1263 for (di = 0; di < 6; di++) {
1264 eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di);
1267 /* Reset the ECC engine */
1268 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1272 ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
1273 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
1274 eccbuf[4], eccbuf[5]);
1278 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1280 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1281 /* There's an implicit DoC_WaitReady() in DoC_Command */
1283 dummy = ReadDOC(docptr, CDSNSlowIO);
1286 if (ReadDOC_(docptr, this->ioreg) & 1) {
1287 puts ("Error programming flash\n");
1288 /* Error in programming */
1293 /* Let the caller know we completed it */
1301 /* Write the ECC data to flash */
1302 for (di=0; di<6; di++)
1308 ret = doc_write_oob(this, to, 8, &dummy, x);
1314 int doc_read_oob(struct DiskOnChip* this, loff_t ofs, size_t len,
1315 size_t * retlen, u_char * buf)
1317 int len256 = 0, ret;
1318 unsigned long docptr;
1319 struct Nand *mychip;
1321 docptr = this->virtadr;
1323 mychip = &this->chips[shr(ofs, this->chipshift)];
1325 if (this->curfloor != mychip->floor) {
1326 DoC_SelectFloor(this, mychip->floor);
1327 DoC_SelectChip(this, mychip->chip);
1328 } else if (this->curchip != mychip->chip) {
1329 DoC_SelectChip(this, mychip->chip);
1331 this->curfloor = mychip->floor;
1332 this->curchip = mychip->chip;
1334 /* update address for 2M x 8bit devices. OOB starts on the second */
1335 /* page to maintain compatibility with doc_read_ecc. */
1336 if (this->page256) {
1343 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1344 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0);
1346 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1347 /* Note: datasheet says it should automaticaly wrap to the */
1348 /* next OOB block, but it didn't work here. mf. */
1349 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1350 len256 = (ofs | 0x7) + 1 - ofs;
1351 DoC_ReadBuf(this, buf, len256);
1353 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1354 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff),
1358 DoC_ReadBuf(this, &buf[len256], len - len256);
1361 /* Reading the full OOB data drops us off of the end of the page,
1362 * causing the flash device to go into busy mode, so we need
1363 * to wait until ready 11.4.1 and Toshiba TC58256FT docs */
1365 ret = DoC_WaitReady(this);
1371 int doc_write_oob(struct DiskOnChip* this, loff_t ofs, size_t len,
1372 size_t * retlen, const u_char * buf)
1375 unsigned long docptr = this->virtadr;
1376 struct Nand *mychip = &this->chips[shr(ofs, this->chipshift)];
1380 printf("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n",
1381 (long)ofs, len, buf[0], buf[1], buf[2], buf[3],
1382 buf[8], buf[9], buf[14],buf[15]);
1385 /* Find the chip which is to be used and select it */
1386 if (this->curfloor != mychip->floor) {
1387 DoC_SelectFloor(this, mychip->floor);
1388 DoC_SelectChip(this, mychip->chip);
1389 } else if (this->curchip != mychip->chip) {
1390 DoC_SelectChip(this, mychip->chip);
1392 this->curfloor = mychip->floor;
1393 this->curchip = mychip->chip;
1395 /* disable the ECC engine */
1396 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
1397 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
1399 /* Reset the chip, see Software Requirement 11.4 item 1. */
1400 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1402 /* issue the Read2 command to set the pointer to the Spare Data Area. */
1403 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1405 /* update address for 2M x 8bit devices. OOB starts on the second */
1406 /* page to maintain compatibility with doc_read_ecc. */
1407 if (this->page256) {
1414 /* issue the Serial Data In command to initial the Page Program process */
1415 DoC_Command(this, NAND_CMD_SEQIN, 0);
1416 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0);
1418 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1419 /* Note: datasheet says it should automaticaly wrap to the */
1420 /* next OOB block, but it didn't work here. mf. */
1421 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1422 len256 = (ofs | 0x7) + 1 - ofs;
1423 DoC_WriteBuf(this, buf, len256);
1425 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1426 DoC_Command(this, NAND_CMD_STATUS, 0);
1427 /* DoC_WaitReady() is implicit in DoC_Command */
1429 dummy = ReadDOC(docptr, CDSNSlowIO);
1432 if (ReadDOC_(docptr, this->ioreg) & 1) {
1433 puts ("Error programming oob data\n");
1434 /* There was an error */
1438 DoC_Command(this, NAND_CMD_SEQIN, 0);
1439 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0);
1442 DoC_WriteBuf(this, &buf[len256], len - len256);
1444 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1445 DoC_Command(this, NAND_CMD_STATUS, 0);
1446 /* DoC_WaitReady() is implicit in DoC_Command */
1448 dummy = ReadDOC(docptr, CDSNSlowIO);
1451 if (ReadDOC_(docptr, this->ioreg) & 1) {
1452 puts ("Error programming oob data\n");
1453 /* There was an error */
1463 int doc_erase(struct DiskOnChip* this, loff_t ofs, size_t len)
1466 unsigned long docptr;
1467 struct Nand *mychip;
1469 if (ofs & (this->erasesize-1) || len & (this->erasesize-1)) {
1470 puts ("Offset and size must be sector aligned\n");
1474 docptr = this->virtadr;
1476 /* FIXME: Do this in the background. Use timers or schedule_task() */
1478 mychip = &this->chips[shr(ofs, this->chipshift)];
1480 if (this->curfloor != mychip->floor) {
1481 DoC_SelectFloor(this, mychip->floor);
1482 DoC_SelectChip(this, mychip->chip);
1483 } else if (this->curchip != mychip->chip) {
1484 DoC_SelectChip(this, mychip->chip);
1486 this->curfloor = mychip->floor;
1487 this->curchip = mychip->chip;
1489 DoC_Command(this, NAND_CMD_ERASE1, 0);
1490 DoC_Address(this, ADDR_PAGE, ofs, 0, 0);
1491 DoC_Command(this, NAND_CMD_ERASE2, 0);
1493 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1495 dummy = ReadDOC(docptr, CDSNSlowIO);
1498 if (ReadDOC_(docptr, this->ioreg) & 1) {
1499 printf("Error erasing at 0x%lx\n", (long)ofs);
1500 /* There was an error */
1503 ofs += this->erasesize;
1504 len -= this->erasesize;
1511 static inline int doccheck(unsigned long potential, unsigned long physadr)
1513 unsigned long window=potential;
1514 unsigned char tmp, ChipID;
1515 #ifndef DOC_PASSIVE_PROBE
1519 /* Routine copied from the Linux DOC driver */
1521 #ifdef CFG_DOCPROBE_55AA
1522 /* Check for 0x55 0xAA signature at beginning of window,
1523 this is no longer true once we remove the IPL (for Millennium */
1524 if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
1526 #endif /* CFG_DOCPROBE_55AA */
1528 #ifndef DOC_PASSIVE_PROBE
1529 /* It's not possible to cleanly detect the DiskOnChip - the
1530 * bootup procedure will put the device into reset mode, and
1531 * it's not possible to talk to it without actually writing
1532 * to the DOCControl register. So we store the current contents
1533 * of the DOCControl register's location, in case we later decide
1534 * that it's not a DiskOnChip, and want to put it back how we
1537 tmp2 = ReadDOC(window, DOCControl);
1539 /* Reset the DiskOnChip ASIC */
1540 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
1541 window, DOCControl);
1542 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
1543 window, DOCControl);
1545 /* Enable the DiskOnChip ASIC */
1546 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
1547 window, DOCControl);
1548 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
1549 window, DOCControl);
1550 #endif /* !DOC_PASSIVE_PROBE */
1552 ChipID = ReadDOC(window, ChipID);
1555 case DOC_ChipID_Doc2k:
1556 /* Check the TOGGLE bit in the ECC register */
1557 tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
1558 if ((ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT) != tmp)
1562 case DOC_ChipID_DocMil:
1563 /* Check the TOGGLE bit in the ECC register */
1564 tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
1565 if ((ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT) != tmp)
1570 #ifndef CFG_DOCPROBE_55AA
1572 * if the ID isn't the DoC2000 or DoCMillenium ID, so we can assume
1573 * the DOC is missing
1576 printf("Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
1580 #ifndef DOC_PASSIVE_PROBE
1581 /* Put back the contents of the DOCControl register, in case it's not
1582 * actually a DiskOnChip.
1584 WriteDOC(tmp2, window, DOCControl);
1589 puts ("DiskOnChip failed TOGGLE test, dropping.\n");
1591 #ifndef DOC_PASSIVE_PROBE
1592 /* Put back the contents of the DOCControl register: it's not a DiskOnChip */
1593 WriteDOC(tmp2, window, DOCControl);
1598 void doc_probe(unsigned long physadr)
1600 struct DiskOnChip *this = NULL;
1603 if ((ChipID = doccheck(physadr, physadr))) {
1605 for (i=0; i<CFG_MAX_DOC_DEVICE; i++) {
1606 if (doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN) {
1607 this = doc_dev_desc + i;
1613 puts ("Cannot allocate memory for data structures.\n");
1617 if (curr_device == -1)
1620 memset((char *)this, 0, sizeof(struct DiskOnChip));
1622 this->virtadr = physadr;
1623 this->physadr = physadr;
1624 this->ChipID = ChipID;
1628 puts ("No DiskOnChip found\n");