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;
209 show_boot_progress (34);
212 addr = CFG_LOAD_ADDR;
213 boot_device = getenv ("bootdevice");
216 addr = simple_strtoul(argv[1], NULL, 16);
217 boot_device = getenv ("bootdevice");
220 addr = simple_strtoul(argv[1], NULL, 16);
221 boot_device = argv[2];
224 addr = simple_strtoul(argv[1], NULL, 16);
225 boot_device = argv[2];
226 offset = simple_strtoul(argv[3], NULL, 16);
229 printf ("Usage:\n%s\n", cmdtp->usage);
230 show_boot_progress (-35);
234 show_boot_progress (35);
236 puts ("\n** No boot device **\n");
237 show_boot_progress (-36);
240 show_boot_progress (36);
242 dev = simple_strtoul(boot_device, &ep, 16);
244 if ((dev >= CFG_MAX_DOC_DEVICE) ||
245 (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN)) {
246 printf ("\n** Device %d not available\n", dev);
247 show_boot_progress (-37);
250 show_boot_progress (37);
252 printf ("\nLoading from device %d: %s at 0x%lX (offset 0x%lX)\n",
253 dev, doc_dev_desc[dev].name, doc_dev_desc[dev].physadr,
256 if (doc_rw (doc_dev_desc + dev, 1, offset,
257 SECTORSIZE, NULL, (u_char *)addr)) {
258 printf ("** Read error on %d\n", dev);
259 show_boot_progress (-38);
262 show_boot_progress (38);
264 hdr = (image_header_t *)addr;
266 if (hdr->ih_magic == IH_MAGIC) {
268 print_image_hdr (hdr);
270 cnt = (ntohl(hdr->ih_size) + sizeof(image_header_t));
273 puts ("\n** Bad Magic Number **\n");
274 show_boot_progress (-39);
277 show_boot_progress (39);
279 if (doc_rw (doc_dev_desc + dev, 1, offset + SECTORSIZE, cnt,
280 NULL, (u_char *)(addr+SECTORSIZE))) {
281 printf ("** Read error on %d\n", dev);
282 show_boot_progress (-40);
285 show_boot_progress (40);
287 /* Loading ok, update default load address */
291 /* Check if we should attempt an auto-start */
292 if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
294 extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
296 local_args[0] = argv[0];
297 local_args[1] = NULL;
299 printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
301 do_bootm (cmdtp, 0, 1, local_args);
308 docboot, 4, 1, do_docboot,
309 "docboot - boot from DOC device\n",
313 int doc_rw (struct DiskOnChip* this, int cmd,
314 loff_t from, size_t len,
315 size_t * retlen, u_char * buf)
317 int noecc, ret = 0, n, total = 0;
321 /* The ECC will not be calculated correctly if
322 less than 512 is written or read */
323 noecc = (from != (from | 0x1ff) + 1) || (len < 0x200);
326 ret = doc_read_ecc(this, from, len,
327 (size_t *)&n, (u_char*)buf,
328 noecc ? (uchar *)NULL : (uchar *)eccbuf);
330 ret = doc_write_ecc(this, from, len,
331 (size_t *)&n, (u_char*)buf,
332 noecc ? (uchar *)NULL : (uchar *)eccbuf);
349 void doc_print(struct DiskOnChip *this) {
350 printf("%s at 0x%lX,\n"
351 "\t %d chip%s %s, size %d MB, \n"
352 "\t total size %ld MB, sector size %ld kB\n",
353 this->name, this->physadr, this->numchips,
354 this->numchips>1 ? "s" : "", this->chips_name,
355 1 << (this->chipshift - 20),
356 this->totlen >> 20, this->erasesize >> 10);
358 if (this->nftl_found) {
359 struct NFTLrecord *nftl = &this->nftl;
360 unsigned long bin_size, flash_size;
362 bin_size = nftl->nb_boot_blocks * this->erasesize;
363 flash_size = (nftl->nb_blocks - nftl->nb_boot_blocks) * this->erasesize;
365 printf("\t NFTL boot record:\n"
366 "\t Binary partition: size %ld%s\n"
367 "\t Flash disk partition: size %ld%s, offset 0x%lx\n",
368 bin_size > (1 << 20) ? bin_size >> 20 : bin_size >> 10,
369 bin_size > (1 << 20) ? "MB" : "kB",
370 flash_size > (1 << 20) ? flash_size >> 20 : flash_size >> 10,
371 flash_size > (1 << 20) ? "MB" : "kB", bin_size);
373 puts ("\t No NFTL boot record found.\n");
377 /* ------------------------------------------------------------------------- */
379 /* This function is needed to avoid calls of the __ashrdi3 function. */
380 static int shr(int val, int shift) {
384 /* Perform the required delay cycles by reading from the appropriate register */
385 static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles)
390 for (i = 0; i < cycles; i++) {
391 if (DoC_is_Millennium(doc))
392 dummy = ReadDOC(doc->virtadr, NOP);
394 dummy = ReadDOC(doc->virtadr, DOCStatus);
399 /* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
400 static int _DoC_WaitReady(struct DiskOnChip *doc)
402 unsigned long docptr = doc->virtadr;
403 unsigned long start = get_timer(0);
406 puts ("_DoC_WaitReady called for out-of-line wait\n");
409 /* Out-of-line routine to wait for chip response */
410 while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
411 #ifdef CFG_DOC_SHORT_TIMEOUT
412 /* it seems that after a certain time the DoC deasserts
413 * the CDSN_CTRL_FR_B although it is not ready...
414 * using a short timout solve this (timer increments every ms) */
415 if (get_timer(start) > 10) {
419 if (get_timer(start) > 10 * 1000) {
420 puts ("_DoC_WaitReady timed out.\n");
430 static int DoC_WaitReady(struct DiskOnChip *doc)
432 unsigned long docptr = doc->virtadr;
433 /* This is inline, to optimise the common case, where it's ready instantly */
436 /* 4 read form NOP register should be issued in prior to the read from CDSNControl
437 see Software Requirement 11.4 item 2. */
440 if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
441 /* Call the out-of-line routine to wait */
442 ret = _DoC_WaitReady(doc);
444 /* issue 2 read from NOP register after reading from CDSNControl register
445 see Software Requirement 11.4 item 2. */
451 /* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to
452 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
453 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
455 static inline int DoC_Command(struct DiskOnChip *doc, unsigned char command,
456 unsigned char xtraflags)
458 unsigned long docptr = doc->virtadr;
460 if (DoC_is_2000(doc))
461 xtraflags |= CDSN_CTRL_FLASH_IO;
463 /* Assert the CLE (Command Latch Enable) line to the flash chip */
464 WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl);
465 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
467 if (DoC_is_Millennium(doc))
468 WriteDOC(command, docptr, CDSNSlowIO);
470 /* Send the command */
471 WriteDOC_(command, docptr, doc->ioreg);
473 /* Lower the CLE line */
474 WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl);
475 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
477 /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */
478 return DoC_WaitReady(doc);
481 /* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to
482 bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is
483 required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */
485 static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs,
486 unsigned char xtraflags1, unsigned char xtraflags2)
488 unsigned long docptr;
491 docptr = doc->virtadr;
493 if (DoC_is_2000(doc))
494 xtraflags1 |= CDSN_CTRL_FLASH_IO;
496 /* Assert the ALE (Address Latch Enable) line to the flash chip */
497 WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl);
499 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
501 /* Send the address */
502 /* Devices with 256-byte page are addressed as:
503 Column (bits 0-7), Page (bits 8-15, 16-23, 24-31)
504 * there is no device on the market with page256
505 and more than 24 bits.
506 Devices with 512-byte page are addressed as:
507 Column (bits 0-7), Page (bits 9-16, 17-24, 25-31)
508 * 25-31 is sent only if the chip support it.
509 * bit 8 changes the read command to be sent
510 (NAND_CMD_READ0 or NAND_CMD_READ1).
513 if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) {
514 if (DoC_is_Millennium(doc))
515 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
516 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
525 if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) {
526 for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) {
527 if (DoC_is_Millennium(doc))
528 WriteDOC(ofs & 0xff, docptr, CDSNSlowIO);
529 WriteDOC_(ofs & 0xff, docptr, doc->ioreg);
533 DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */
535 /* FIXME: The SlowIO's for millennium could be replaced by
536 a single WritePipeTerm here. mf. */
538 /* Lower the ALE line */
539 WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr,
542 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
544 /* Wait for the chip to respond - Software requirement 11.4.1 */
545 return DoC_WaitReady(doc);
548 /* Read a buffer from DoC, taking care of Millennium oddities */
549 static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len)
552 int modulus = 0xffff;
553 unsigned long docptr;
556 docptr = doc->virtadr;
561 if (DoC_is_Millennium(doc)) {
562 /* Read the data via the internal pipeline through CDSN IO register,
563 see Pipelined Read Operations 11.3 */
564 dummy = ReadDOC(docptr, ReadPipeInit);
566 /* Millennium should use the LastDataRead register - Pipeline Reads */
569 /* This is needed for correctly ECC calculation */
573 for (i = 0; i < len; i++)
574 buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus));
576 if (DoC_is_Millennium(doc)) {
577 buf[i] = ReadDOC(docptr, LastDataRead);
581 /* Write a buffer to DoC, taking care of Millennium oddities */
582 static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len)
584 unsigned long docptr;
587 docptr = doc->virtadr;
592 for (i = 0; i < len; i++)
593 WriteDOC_(buf[i], docptr, doc->ioreg + i);
595 if (DoC_is_Millennium(doc)) {
596 WriteDOC(0x00, docptr, WritePipeTerm);
601 /* DoC_SelectChip: Select a given flash chip within the current floor */
603 static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip)
605 unsigned long docptr = doc->virtadr;
607 /* Software requirement 11.4.4 before writing DeviceSelect */
608 /* Deassert the CE line to eliminate glitches on the FCE# outputs */
609 WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl);
610 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
612 /* Select the individual flash chip requested */
613 WriteDOC(chip, docptr, CDSNDeviceSelect);
616 /* Reassert the CE line */
617 WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr,
619 DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */
621 /* Wait for it to be ready */
622 return DoC_WaitReady(doc);
625 /* DoC_SelectFloor: Select a given floor (bank of flash chips) */
627 static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor)
629 unsigned long docptr = doc->virtadr;
631 /* Select the floor (bank) of chips required */
632 WriteDOC(floor, docptr, FloorSelect);
634 /* Wait for the chip to be ready */
635 return DoC_WaitReady(doc);
638 /* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */
640 static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip)
645 /* Page in the required floor/chip */
646 DoC_SelectFloor(doc, floor);
647 DoC_SelectChip(doc, chip);
650 if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) {
652 printf("DoC_Command (reset) for %d,%d returned true\n",
659 /* Read the NAND chip ID: 1. Send ReadID command */
660 if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) {
662 printf("DoC_Command (ReadID) for %d,%d returned true\n",
668 /* Read the NAND chip ID: 2. Send address byte zero */
669 DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0);
671 /* Read the manufacturer and device id codes from the device */
673 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
674 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
676 mfr = ReadDOC_(doc->virtadr, doc->ioreg);
678 /* CDSN Slow IO register see Software Requirement 11.4 item 5. */
679 dummy = ReadDOC(doc->virtadr, CDSNSlowIO);
681 id = ReadDOC_(doc->virtadr, doc->ioreg);
683 /* No response - return failure */
684 if (mfr == 0xff || mfr == 0)
687 /* Check it's the same as the first chip we identified.
688 * M-Systems say that any given DiskOnChip device should only
689 * contain _one_ type of flash part, although that's not a
690 * hardware restriction. */
692 if (doc->mfr == mfr && doc->id == id)
693 return 1; /* This is another the same the first */
695 printf("Flash chip at floor %d, chip %d is different:\n",
699 /* Print and store the manufacturer and ID codes. */
700 for (i = 0; nand_flash_ids[i].name != NULL; i++) {
701 if (mfr == nand_flash_ids[i].manufacture_id &&
702 id == nand_flash_ids[i].model_id) {
704 printf("Flash chip found: Manufacturer ID: %2.2X, "
705 "Chip ID: %2.2X (%s)\n", mfr, id,
706 nand_flash_ids[i].name);
712 nand_flash_ids[i].chipshift;
713 doc->page256 = nand_flash_ids[i].page256;
715 nand_flash_ids[i].pageadrlen;
717 nand_flash_ids[i].erasesize;
719 nand_flash_ids[i].name;
728 /* We haven't fully identified the chip. Print as much as we know. */
729 printf("Unknown flash chip found: %2.2X %2.2X\n",
736 /* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */
738 static void DoC_ScanChips(struct DiskOnChip *this)
741 int numchips[MAX_FLOORS];
742 int maxchips = MAX_CHIPS;
749 if (DoC_is_Millennium(this))
750 maxchips = MAX_CHIPS_MIL;
752 /* For each floor, find the number of valid chips it contains */
753 for (floor = 0; floor < MAX_FLOORS; floor++) {
756 for (chip = 0; chip < maxchips && ret != 0; chip++) {
758 ret = DoC_IdentChip(this, floor, chip);
766 /* If there are none at all that we recognise, bail */
767 if (!this->numchips) {
768 puts ("No flash chips recognised.\n");
772 /* Allocate an array to hold the information for each chip */
773 this->chips = malloc(sizeof(struct Nand) * this->numchips);
775 puts ("No memory for allocating chip info structures\n");
781 /* Fill out the chip array with {floor, chipno} for each
782 * detected chip in the device. */
783 for (floor = 0; floor < MAX_FLOORS; floor++) {
784 for (chip = 0; chip < numchips[floor]; chip++) {
785 this->chips[ret].floor = floor;
786 this->chips[ret].chip = chip;
787 this->chips[ret].curadr = 0;
788 this->chips[ret].curmode = 0x50;
793 /* Calculate and print the total size of the device */
794 this->totlen = this->numchips * (1 << this->chipshift);
797 printf("%d flash chips found. Total DiskOnChip size: %ld MB\n",
798 this->numchips, this->totlen >> 20);
802 /* find_boot_record: Find the NFTL Media Header and its Spare copy which contains the
803 * various device information of the NFTL partition and Bad Unit Table. Update
804 * the ReplUnitTable[] table accroding to the Bad Unit Table. ReplUnitTable[]
805 * is used for management of Erase Unit in other routines in nftl.c and nftlmount.c
807 static int find_boot_record(struct NFTLrecord *nftl)
811 unsigned int block, boot_record_count = 0;
814 struct NFTLMediaHeader *mh = &nftl->MediaHdr;
817 nftl->MediaUnit = BLOCK_NIL;
818 nftl->SpareMediaUnit = BLOCK_NIL;
820 /* search for a valid boot record */
821 for (block = 0; block < nftl->nb_blocks; block++) {
824 /* Check for ANAND header first. Then can whinge if it's found but later
826 if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize, SECTORSIZE,
827 (size_t *)&retlen, buf, NULL))) {
828 static int warncount = 5;
831 printf("Block read at 0x%x failed\n", block * nftl->EraseSize);
833 puts ("Further failures for this block will not be printed\n");
838 if (retlen < 6 || memcmp(buf, "ANAND", 6)) {
839 /* ANAND\0 not found. Continue */
841 printf("ANAND header not found at 0x%x\n", block * nftl->EraseSize);
847 printf("ANAND header found at 0x%x\n", block * nftl->EraseSize);
850 /* To be safer with BIOS, also use erase mark as discriminant */
851 if ((ret = doc_read_oob(nftl->mtd, block * nftl->EraseSize + SECTORSIZE + 8,
852 8, (size_t *)&retlen, (uchar *)&h1) < 0)) {
854 printf("ANAND header found at 0x%x, but OOB data read failed\n",
855 block * nftl->EraseSize);
860 /* OK, we like it. */
862 if (boot_record_count) {
863 /* We've already processed one. So we just check if
864 this one is the same as the first one we found */
865 if (memcmp(mh, buf, sizeof(struct NFTLMediaHeader))) {
867 printf("NFTL Media Headers at 0x%x and 0x%x disagree.\n",
868 nftl->MediaUnit * nftl->EraseSize, block * nftl->EraseSize);
870 /* if (debug) Print both side by side */
873 if (boot_record_count == 1)
874 nftl->SpareMediaUnit = block;
880 /* This is the first we've seen. Copy the media header structure into place */
881 memcpy(mh, buf, sizeof(struct NFTLMediaHeader));
883 /* Do some sanity checks on it */
884 if (mh->UnitSizeFactor == 0) {
886 puts ("UnitSizeFactor 0x00 detected.\n"
887 "This violates the spec but we think we know what it means...\n");
889 } else if (mh->UnitSizeFactor != 0xff) {
890 printf ("Sorry, we don't support UnitSizeFactor "
895 nftl->nb_boot_blocks = le16_to_cpu(mh->FirstPhysicalEUN);
896 if ((nftl->nb_boot_blocks + 2) >= nftl->nb_blocks) {
897 printf ("NFTL Media Header sanity check failed:\n"
898 "nb_boot_blocks (%d) + 2 > nb_blocks (%d)\n",
899 nftl->nb_boot_blocks, nftl->nb_blocks);
903 nftl->numvunits = le32_to_cpu(mh->FormattedSize) / nftl->EraseSize;
904 if (nftl->numvunits > (nftl->nb_blocks - nftl->nb_boot_blocks - 2)) {
905 printf ("NFTL Media Header sanity check failed:\n"
906 "numvunits (%d) > nb_blocks (%d) - nb_boot_blocks(%d) - 2\n",
909 nftl->nb_boot_blocks);
913 nftl->nr_sects = nftl->numvunits * (nftl->EraseSize / SECTORSIZE);
915 /* If we're not using the last sectors in the device for some reason,
916 reduce nb_blocks accordingly so we forget they're there */
917 nftl->nb_blocks = le16_to_cpu(mh->NumEraseUnits) + le16_to_cpu(mh->FirstPhysicalEUN);
919 /* read the Bad Erase Unit Table and modify ReplUnitTable[] accordingly */
920 for (i = 0; i < nftl->nb_blocks; i++) {
921 if ((i & (SECTORSIZE - 1)) == 0) {
922 /* read one sector for every SECTORSIZE of blocks */
923 if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize +
924 i + SECTORSIZE, SECTORSIZE,
925 (size_t *)&retlen, buf, (uchar *)&oob)) < 0) {
926 puts ("Read of bad sector table failed\n");
930 /* mark the Bad Erase Unit as RESERVED in ReplUnitTable */
931 if (buf[i & (SECTORSIZE - 1)] != 0xff)
932 nftl->ReplUnitTable[i] = BLOCK_RESERVED;
935 nftl->MediaUnit = block;
938 } /* foreach (block) */
940 return boot_record_count?0:-1;
943 /* This routine is made available to other mtd code via
944 * inter_module_register. It must only be accessed through
945 * inter_module_get which will bump the use count of this module. The
946 * addresses passed back in mtd are valid as long as the use count of
947 * this module is non-zero, i.e. between inter_module_get and
948 * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000.
950 static void DoC2k_init(struct DiskOnChip* this)
952 struct NFTLrecord *nftl;
954 switch (this->ChipID) {
955 case DOC_ChipID_Doc2k:
956 this->name = "DiskOnChip 2000";
957 this->ioreg = DoC_2k_CDSN_IO;
959 case DOC_ChipID_DocMil:
960 this->name = "DiskOnChip Millennium";
961 this->ioreg = DoC_Mil_CDSN_IO;
966 printf("%s found at address 0x%lX\n", this->name,
976 /* Ident all the chips present. */
978 if ((!this->numchips) || (!this->chips))
983 /* Get physical parameters */
984 nftl->EraseSize = this->erasesize;
985 nftl->nb_blocks = this->totlen / this->erasesize;
988 if (find_boot_record(nftl) != 0)
989 this->nftl_found = 0;
991 this->nftl_found = 1;
993 printf("%s @ 0x%lX, %ld MB\n", this->name, this->physadr, this->totlen >> 20);
996 int doc_read_ecc(struct DiskOnChip* this, loff_t from, size_t len,
997 size_t * retlen, u_char * buf, u_char * eccbuf)
999 unsigned long docptr;
1000 struct Nand *mychip;
1001 unsigned char syndrome[6];
1002 volatile char dummy;
1003 int i, len256 = 0, ret=0;
1005 docptr = this->virtadr;
1007 /* Don't allow read past end of device */
1008 if (from >= this->totlen) {
1009 puts ("Out of flash\n");
1013 /* Don't allow a single read to cross a 512-byte block boundary */
1014 if (from + len > ((from | 0x1ff) + 1))
1015 len = ((from | 0x1ff) + 1) - from;
1017 /* The ECC will not be calculated correctly if less than 512 is read */
1018 if (len != 0x200 && eccbuf)
1019 printf("ECC needs a full sector read (adr: %lx size %lx)\n",
1020 (long) from, (long) len);
1023 printf("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len);
1026 /* Find the chip which is to be used and select it */
1027 mychip = &this->chips[shr(from, this->chipshift)];
1029 if (this->curfloor != mychip->floor) {
1030 DoC_SelectFloor(this, mychip->floor);
1031 DoC_SelectChip(this, mychip->chip);
1032 } else if (this->curchip != mychip->chip) {
1033 DoC_SelectChip(this, mychip->chip);
1036 this->curfloor = mychip->floor;
1037 this->curchip = mychip->chip;
1041 && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
1043 DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP,
1047 /* Prime the ECC engine */
1048 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1049 WriteDOC(DOC_ECC_EN, docptr, ECCConf);
1051 /* disable the ECC engine */
1052 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1053 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1056 /* treat crossing 256-byte sector for 2M x 8bits devices */
1057 if (this->page256 && from + len > (from | 0xff) + 1) {
1058 len256 = (from | 0xff) + 1 - from;
1059 DoC_ReadBuf(this, buf, len256);
1061 DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP);
1062 DoC_Address(this, ADDR_COLUMN_PAGE, from + len256,
1063 CDSN_CTRL_WP, CDSN_CTRL_ECC_IO);
1066 DoC_ReadBuf(this, &buf[len256], len - len256);
1068 /* Let the caller know we completed it */
1072 /* Read the ECC data through the DiskOnChip ECC logic */
1073 /* Note: this will work even with 2M x 8bit devices as */
1074 /* they have 8 bytes of OOB per 256 page. mf. */
1075 DoC_ReadBuf(this, eccbuf, 6);
1077 /* Flush the pipeline */
1078 if (DoC_is_Millennium(this)) {
1079 dummy = ReadDOC(docptr, ECCConf);
1080 dummy = ReadDOC(docptr, ECCConf);
1081 i = ReadDOC(docptr, ECCConf);
1083 dummy = ReadDOC(docptr, 2k_ECCStatus);
1084 dummy = ReadDOC(docptr, 2k_ECCStatus);
1085 i = ReadDOC(docptr, 2k_ECCStatus);
1088 /* Check the ECC Status */
1091 /* There was an ECC error */
1093 printf("DiskOnChip ECC Error: Read at %lx\n", (long)from);
1095 /* Read the ECC syndrom through the DiskOnChip ECC logic.
1096 These syndrome will be all ZERO when there is no error */
1097 for (i = 0; i < 6; i++) {
1099 ReadDOC(docptr, ECCSyndrome0 + i);
1101 nb_errors = doc_decode_ecc(buf, syndrome);
1104 printf("Errors corrected: %x\n", nb_errors);
1106 if (nb_errors < 0) {
1107 /* We return error, but have actually done the read. Not that
1108 this can be told to user-space, via sys_read(), but at least
1109 MTD-aware stuff can know about it by checking *retlen */
1110 printf("ECC Errors at %lx\n", (long)from);
1116 printf("ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
1117 (long)from, eccbuf[0], eccbuf[1], eccbuf[2],
1118 eccbuf[3], eccbuf[4], eccbuf[5]);
1121 /* disable the ECC engine */
1122 WriteDOC(DOC_ECC_DIS, docptr , ECCConf);
1125 /* according to 11.4.1, we need to wait for the busy line
1126 * drop if we read to the end of the page. */
1127 if(0 == ((from + *retlen) & 0x1ff))
1129 DoC_WaitReady(this);
1135 int doc_write_ecc(struct DiskOnChip* this, loff_t to, size_t len,
1136 size_t * retlen, const u_char * buf,
1139 int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */
1140 unsigned long docptr;
1141 volatile char dummy;
1143 struct Nand *mychip;
1145 docptr = this->virtadr;
1147 /* Don't allow write past end of device */
1148 if (to >= this->totlen) {
1149 puts ("Out of flash\n");
1153 /* Don't allow a single write to cross a 512-byte block boundary */
1154 if (to + len > ((to | 0x1ff) + 1))
1155 len = ((to | 0x1ff) + 1) - to;
1157 /* The ECC will not be calculated correctly if less than 512 is written */
1158 if (len != 0x200 && eccbuf)
1159 printf("ECC needs a full sector write (adr: %lx size %lx)\n",
1160 (long) to, (long) len);
1162 /* printf("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */
1164 /* Find the chip which is to be used and select it */
1165 mychip = &this->chips[shr(to, this->chipshift)];
1167 if (this->curfloor != mychip->floor) {
1168 DoC_SelectFloor(this, mychip->floor);
1169 DoC_SelectChip(this, mychip->chip);
1170 } else if (this->curchip != mychip->chip) {
1171 DoC_SelectChip(this, mychip->chip);
1174 this->curfloor = mychip->floor;
1175 this->curchip = mychip->chip;
1177 /* Set device to main plane of flash */
1178 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1181 && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0,
1184 DoC_Command(this, NAND_CMD_SEQIN, 0);
1185 DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO);
1188 /* Prime the ECC engine */
1189 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1190 WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
1192 /* disable the ECC engine */
1193 WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
1194 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1197 /* treat crossing 256-byte sector for 2M x 8bits devices */
1198 if (this->page256 && to + len > (to | 0xff) + 1) {
1199 len256 = (to | 0xff) + 1 - to;
1200 DoC_WriteBuf(this, buf, len256);
1202 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1204 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1205 /* There's an implicit DoC_WaitReady() in DoC_Command */
1207 dummy = ReadDOC(docptr, CDSNSlowIO);
1210 if (ReadDOC_(docptr, this->ioreg) & 1) {
1211 puts ("Error programming flash\n");
1212 /* Error in programming */
1217 DoC_Command(this, NAND_CMD_SEQIN, 0);
1218 DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0,
1222 DoC_WriteBuf(this, &buf[len256], len - len256);
1225 WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr,
1228 if (DoC_is_Millennium(this)) {
1229 WriteDOC(0, docptr, NOP);
1230 WriteDOC(0, docptr, NOP);
1231 WriteDOC(0, docptr, NOP);
1233 WriteDOC_(0, docptr, this->ioreg);
1234 WriteDOC_(0, docptr, this->ioreg);
1235 WriteDOC_(0, docptr, this->ioreg);
1238 /* Read the ECC data through the DiskOnChip ECC logic */
1239 for (di = 0; di < 6; di++) {
1240 eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di);
1243 /* Reset the ECC engine */
1244 WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
1248 ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n",
1249 (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3],
1250 eccbuf[4], eccbuf[5]);
1254 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1256 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1257 /* There's an implicit DoC_WaitReady() in DoC_Command */
1259 dummy = ReadDOC(docptr, CDSNSlowIO);
1262 if (ReadDOC_(docptr, this->ioreg) & 1) {
1263 puts ("Error programming flash\n");
1264 /* Error in programming */
1269 /* Let the caller know we completed it */
1277 /* Write the ECC data to flash */
1278 for (di=0; di<6; di++)
1284 ret = doc_write_oob(this, to, 8, &dummy, x);
1290 int doc_read_oob(struct DiskOnChip* this, loff_t ofs, size_t len,
1291 size_t * retlen, u_char * buf)
1293 int len256 = 0, ret;
1294 unsigned long docptr;
1295 struct Nand *mychip;
1297 docptr = this->virtadr;
1299 mychip = &this->chips[shr(ofs, this->chipshift)];
1301 if (this->curfloor != mychip->floor) {
1302 DoC_SelectFloor(this, mychip->floor);
1303 DoC_SelectChip(this, mychip->chip);
1304 } else if (this->curchip != mychip->chip) {
1305 DoC_SelectChip(this, mychip->chip);
1307 this->curfloor = mychip->floor;
1308 this->curchip = mychip->chip;
1310 /* update address for 2M x 8bit devices. OOB starts on the second */
1311 /* page to maintain compatibility with doc_read_ecc. */
1312 if (this->page256) {
1319 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1320 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0);
1322 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1323 /* Note: datasheet says it should automaticaly wrap to the */
1324 /* next OOB block, but it didn't work here. mf. */
1325 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1326 len256 = (ofs | 0x7) + 1 - ofs;
1327 DoC_ReadBuf(this, buf, len256);
1329 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1330 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff),
1334 DoC_ReadBuf(this, &buf[len256], len - len256);
1337 /* Reading the full OOB data drops us off of the end of the page,
1338 * causing the flash device to go into busy mode, so we need
1339 * to wait until ready 11.4.1 and Toshiba TC58256FT docs */
1341 ret = DoC_WaitReady(this);
1347 int doc_write_oob(struct DiskOnChip* this, loff_t ofs, size_t len,
1348 size_t * retlen, const u_char * buf)
1351 unsigned long docptr = this->virtadr;
1352 struct Nand *mychip = &this->chips[shr(ofs, this->chipshift)];
1356 printf("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n",
1357 (long)ofs, len, buf[0], buf[1], buf[2], buf[3],
1358 buf[8], buf[9], buf[14],buf[15]);
1361 /* Find the chip which is to be used and select it */
1362 if (this->curfloor != mychip->floor) {
1363 DoC_SelectFloor(this, mychip->floor);
1364 DoC_SelectChip(this, mychip->chip);
1365 } else if (this->curchip != mychip->chip) {
1366 DoC_SelectChip(this, mychip->chip);
1368 this->curfloor = mychip->floor;
1369 this->curchip = mychip->chip;
1371 /* disable the ECC engine */
1372 WriteDOC (DOC_ECC_RESET, docptr, ECCConf);
1373 WriteDOC (DOC_ECC_DIS, docptr, ECCConf);
1375 /* Reset the chip, see Software Requirement 11.4 item 1. */
1376 DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP);
1378 /* issue the Read2 command to set the pointer to the Spare Data Area. */
1379 DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP);
1381 /* update address for 2M x 8bit devices. OOB starts on the second */
1382 /* page to maintain compatibility with doc_read_ecc. */
1383 if (this->page256) {
1390 /* issue the Serial Data In command to initial the Page Program process */
1391 DoC_Command(this, NAND_CMD_SEQIN, 0);
1392 DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0);
1394 /* treat crossing 8-byte OOB data for 2M x 8bit devices */
1395 /* Note: datasheet says it should automaticaly wrap to the */
1396 /* next OOB block, but it didn't work here. mf. */
1397 if (this->page256 && ofs + len > (ofs | 0x7) + 1) {
1398 len256 = (ofs | 0x7) + 1 - ofs;
1399 DoC_WriteBuf(this, buf, len256);
1401 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1402 DoC_Command(this, NAND_CMD_STATUS, 0);
1403 /* DoC_WaitReady() is implicit in DoC_Command */
1405 dummy = ReadDOC(docptr, CDSNSlowIO);
1408 if (ReadDOC_(docptr, this->ioreg) & 1) {
1409 puts ("Error programming oob data\n");
1410 /* There was an error */
1414 DoC_Command(this, NAND_CMD_SEQIN, 0);
1415 DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0);
1418 DoC_WriteBuf(this, &buf[len256], len - len256);
1420 DoC_Command(this, NAND_CMD_PAGEPROG, 0);
1421 DoC_Command(this, NAND_CMD_STATUS, 0);
1422 /* DoC_WaitReady() is implicit in DoC_Command */
1424 dummy = ReadDOC(docptr, CDSNSlowIO);
1427 if (ReadDOC_(docptr, this->ioreg) & 1) {
1428 puts ("Error programming oob data\n");
1429 /* There was an error */
1439 int doc_erase(struct DiskOnChip* this, loff_t ofs, size_t len)
1442 unsigned long docptr;
1443 struct Nand *mychip;
1445 if (ofs & (this->erasesize-1) || len & (this->erasesize-1)) {
1446 puts ("Offset and size must be sector aligned\n");
1450 docptr = this->virtadr;
1452 /* FIXME: Do this in the background. Use timers or schedule_task() */
1454 mychip = &this->chips[shr(ofs, this->chipshift)];
1456 if (this->curfloor != mychip->floor) {
1457 DoC_SelectFloor(this, mychip->floor);
1458 DoC_SelectChip(this, mychip->chip);
1459 } else if (this->curchip != mychip->chip) {
1460 DoC_SelectChip(this, mychip->chip);
1462 this->curfloor = mychip->floor;
1463 this->curchip = mychip->chip;
1465 DoC_Command(this, NAND_CMD_ERASE1, 0);
1466 DoC_Address(this, ADDR_PAGE, ofs, 0, 0);
1467 DoC_Command(this, NAND_CMD_ERASE2, 0);
1469 DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP);
1471 dummy = ReadDOC(docptr, CDSNSlowIO);
1474 if (ReadDOC_(docptr, this->ioreg) & 1) {
1475 printf("Error erasing at 0x%lx\n", (long)ofs);
1476 /* There was an error */
1479 ofs += this->erasesize;
1480 len -= this->erasesize;
1487 static inline int doccheck(unsigned long potential, unsigned long physadr)
1489 unsigned long window=potential;
1490 unsigned char tmp, ChipID;
1491 #ifndef DOC_PASSIVE_PROBE
1495 /* Routine copied from the Linux DOC driver */
1497 #ifdef CFG_DOCPROBE_55AA
1498 /* Check for 0x55 0xAA signature at beginning of window,
1499 this is no longer true once we remove the IPL (for Millennium */
1500 if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa)
1502 #endif /* CFG_DOCPROBE_55AA */
1504 #ifndef DOC_PASSIVE_PROBE
1505 /* It's not possible to cleanly detect the DiskOnChip - the
1506 * bootup procedure will put the device into reset mode, and
1507 * it's not possible to talk to it without actually writing
1508 * to the DOCControl register. So we store the current contents
1509 * of the DOCControl register's location, in case we later decide
1510 * that it's not a DiskOnChip, and want to put it back how we
1513 tmp2 = ReadDOC(window, DOCControl);
1515 /* Reset the DiskOnChip ASIC */
1516 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
1517 window, DOCControl);
1518 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
1519 window, DOCControl);
1521 /* Enable the DiskOnChip ASIC */
1522 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
1523 window, DOCControl);
1524 WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
1525 window, DOCControl);
1526 #endif /* !DOC_PASSIVE_PROBE */
1528 ChipID = ReadDOC(window, ChipID);
1531 case DOC_ChipID_Doc2k:
1532 /* Check the TOGGLE bit in the ECC register */
1533 tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT;
1534 if ((ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT) != tmp)
1538 case DOC_ChipID_DocMil:
1539 /* Check the TOGGLE bit in the ECC register */
1540 tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT;
1541 if ((ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT) != tmp)
1546 #ifndef CFG_DOCPROBE_55AA
1548 * if the ID isn't the DoC2000 or DoCMillenium ID, so we can assume
1549 * the DOC is missing
1552 printf("Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n",
1556 #ifndef DOC_PASSIVE_PROBE
1557 /* Put back the contents of the DOCControl register, in case it's not
1558 * actually a DiskOnChip.
1560 WriteDOC(tmp2, window, DOCControl);
1565 puts ("DiskOnChip failed TOGGLE test, dropping.\n");
1567 #ifndef DOC_PASSIVE_PROBE
1568 /* Put back the contents of the DOCControl register: it's not a DiskOnChip */
1569 WriteDOC(tmp2, window, DOCControl);
1574 void doc_probe(unsigned long physadr)
1576 struct DiskOnChip *this = NULL;
1579 if ((ChipID = doccheck(physadr, physadr))) {
1581 for (i=0; i<CFG_MAX_DOC_DEVICE; i++) {
1582 if (doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN) {
1583 this = doc_dev_desc + i;
1589 puts ("Cannot allocate memory for data structures.\n");
1593 if (curr_device == -1)
1596 memset((char *)this, 0, sizeof(struct DiskOnChip));
1598 this->virtadr = physadr;
1599 this->physadr = physadr;
1600 this->ChipID = ChipID;
1604 puts ("No DiskOnChip found\n");