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Diffstat (limited to 'common/cmd_doc.c')
| -rw-r--r-- | common/cmd_doc.c | 1563 |
1 files changed, 1563 insertions, 0 deletions
diff --git a/common/cmd_doc.c b/common/cmd_doc.c new file mode 100644 index 0000000..37d0fbd --- /dev/null +++ b/common/cmd_doc.c @@ -0,0 +1,1563 @@ +/* + * Driver for Disk-On-Chip 2000 and Millennium + * (c) 1999 Machine Vision Holdings, Inc. + * (c) 1999, 2000 David Woodhouse <dwmw2@infradead.org> + * + * $Id: doc2000.c,v 1.46 2001/10/02 15:05:13 dwmw2 Exp $ + */ + +#include <common.h> +#include <config.h> +#include <command.h> +#include <malloc.h> +#include <asm/io.h> + +#ifdef CONFIG_SHOW_BOOT_PROGRESS +# include <status_led.h> +# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg) +#else +# define SHOW_BOOT_PROGRESS(arg) +#endif + +#if (CONFIG_COMMANDS & CFG_CMD_DOC) + +#include <linux/mtd/nand.h> +#include <linux/mtd/nand_ids.h> +#include <linux/mtd/doc2000.h> +#include <linux/mtd/nftl.h> + +#ifdef CFG_DOC_SUPPORT_2000 +#define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k) +#else +#define DoC_is_2000(doc) (0) +#endif + +#ifdef CFG_DOC_SUPPORT_MILLENNIUM +#define DoC_is_Millennium(doc) (doc->ChipID == DOC_ChipID_DocMil) +#else +#define DoC_is_Millennium(doc) (0) +#endif + +/* CFG_DOC_PASSIVE_PROBE: + In order to ensure that the BIOS checksum is correct at boot time, and + hence that the onboard BIOS extension gets executed, the DiskOnChip + goes into reset mode when it is read sequentially: all registers + return 0xff until the chip is woken up again by writing to the + DOCControl register. + + Unfortunately, this means that the probe for the DiskOnChip is unsafe, + because one of the first things it does is write to where it thinks + the DOCControl register should be - which may well be shared memory + for another device. I've had machines which lock up when this is + attempted. Hence the possibility to do a passive probe, which will fail + to detect a chip in reset mode, but is at least guaranteed not to lock + the machine. + + If you have this problem, uncomment the following line: +#define CFG_DOC_PASSIVE_PROBE +*/ + +#undef DOC_DEBUG +#undef ECC_DEBUG +#undef PSYCHO_DEBUG +#undef NFTL_DEBUG + +static struct DiskOnChip doc_dev_desc[CFG_MAX_DOC_DEVICE]; + +/* Current DOC Device */ +static int curr_device = -1; + +/* ------------------------------------------------------------------------- */ + +int do_doc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + int rcode = 0; + + switch (argc) { + case 0: + case 1: + printf ("Usage:\n%s\n", cmdtp->usage); + return 1; + case 2: + if (strcmp(argv[1],"info") == 0) { + int i; + + putc ('\n'); + + for (i=0; i<CFG_MAX_DOC_DEVICE; ++i) { + if(doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN) + continue; /* list only known devices */ + printf ("Device %d: ", i); + doc_print(&doc_dev_desc[i]); + } + return 0; + + } else if (strcmp(argv[1],"device") == 0) { + if ((curr_device < 0) || (curr_device >= CFG_MAX_DOC_DEVICE)) { + puts ("\nno devices available\n"); + return 1; + } + printf ("\nDevice %d: ", curr_device); + doc_print(&doc_dev_desc[curr_device]); + return 0; + } + printf ("Usage:\n%s\n", cmdtp->usage); + return 1; + case 3: + if (strcmp(argv[1],"device") == 0) { + int dev = (int)simple_strtoul(argv[2], NULL, 10); + + printf ("\nDevice %d: ", dev); + if (dev >= CFG_MAX_DOC_DEVICE) { + puts ("unknown device\n"); + return 1; + } + doc_print(&doc_dev_desc[dev]); + /*doc_print (dev);*/ + + if (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN) { + return 1; + } + + curr_device = dev; + + puts ("... is now current device\n"); + + return 0; + } + + printf ("Usage:\n%s\n", cmdtp->usage); + return 1; + default: + /* at least 4 args */ + + if (strcmp(argv[1],"read") == 0 || strcmp(argv[1],"write") == 0) { + ulong addr = simple_strtoul(argv[2], NULL, 16); + ulong off = simple_strtoul(argv[3], NULL, 16); + ulong size = simple_strtoul(argv[4], NULL, 16); + int cmd = (strcmp(argv[1],"read") == 0); + int ret, total; + + printf ("\nDOC %s: device %d offset %ld, size %ld ... ", + cmd ? "read" : "write", curr_device, off, size); + + ret = doc_rw(doc_dev_desc + curr_device, cmd, off, size, + &total, (u_char*)addr); + + printf ("%d bytes %s: %s\n", total, cmd ? "read" : "write", + ret ? "ERROR" : "OK"); + + return ret; + } else if (strcmp(argv[1],"erase") == 0) { + ulong off = simple_strtoul(argv[2], NULL, 16); + ulong size = simple_strtoul(argv[3], NULL, 16); + int ret; + + printf ("\nDOC erase: device %d offset %ld, size %ld ... ", + curr_device, off, size); + + ret = doc_erase (doc_dev_desc + curr_device, off, size); + + printf("%s\n", ret ? "ERROR" : "OK"); + + return ret; + } else { + printf ("Usage:\n%s\n", cmdtp->usage); + rcode = 1; + } + + return rcode; + } +} + +int do_docboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) +{ + char *boot_device = NULL; + char *ep; + int dev; + ulong cnt; + ulong addr; + ulong offset = 0; + image_header_t *hdr; + int rcode = 0; + + switch (argc) { + case 1: + addr = CFG_LOAD_ADDR; + boot_device = getenv ("bootdevice"); + break; + case 2: + addr = simple_strtoul(argv[1], NULL, 16); + boot_device = getenv ("bootdevice"); + break; + case 3: + addr = simple_strtoul(argv[1], NULL, 16); + boot_device = argv[2]; + break; + case 4: + addr = simple_strtoul(argv[1], NULL, 16); + boot_device = argv[2]; + offset = simple_strtoul(argv[3], NULL, 16); + break; + default: + printf ("Usage:\n%s\n", cmdtp->usage); + SHOW_BOOT_PROGRESS (-1); + return 1; + } + + if (!boot_device) { + puts ("\n** No boot device **\n"); + SHOW_BOOT_PROGRESS (-1); + return 1; + } + + dev = simple_strtoul(boot_device, &ep, 16); + + if ((dev >= CFG_MAX_DOC_DEVICE) || + (doc_dev_desc[dev].ChipID == DOC_ChipID_UNKNOWN)) { + printf ("\n** Device %d not available\n", dev); + SHOW_BOOT_PROGRESS (-1); + return 1; + } + + printf ("\nLoading from device %d: %s at 0x%lX (offset 0x%lX)\n", + dev, doc_dev_desc[dev].name, doc_dev_desc[dev].physadr, + offset); + + if (doc_rw (doc_dev_desc + dev, 1, offset, + SECTORSIZE, NULL, (u_char *)addr)) { + printf ("** Read error on %d\n", dev); + SHOW_BOOT_PROGRESS (-1); + return 1; + } + + hdr = (image_header_t *)addr; + + if (hdr->ih_magic == IH_MAGIC) { + + print_image_hdr (hdr); + + cnt = (hdr->ih_size + sizeof(image_header_t)); + cnt -= SECTORSIZE; + } else { + puts ("\n** Bad Magic Number **\n"); + SHOW_BOOT_PROGRESS (-1); + return 1; + } + + if (doc_rw (doc_dev_desc + dev, 1, offset + SECTORSIZE, cnt, + NULL, (u_char *)(addr+SECTORSIZE))) { + printf ("** Read error on %d\n", dev); + SHOW_BOOT_PROGRESS (-1); + return 1; + } + + /* Loading ok, update default load address */ + + load_addr = addr; + + /* Check if we should attempt an auto-start */ + if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) { + char *local_args[2]; + extern int do_bootm (cmd_tbl_t *, int, int, char *[]); + + local_args[0] = argv[0]; + local_args[1] = NULL; + + printf ("Automatic boot of image at addr 0x%08lX ...\n", addr); + + do_bootm (cmdtp, 0, 1, local_args); + rcode = 1; + } + return rcode; +} + +int doc_rw (struct DiskOnChip* this, int cmd, + loff_t from, size_t len, + size_t * retlen, u_char * buf) +{ + int noecc, ret = 0, n, total = 0; + char eccbuf[6]; + + while(len) { + /* The ECC will not be calculated correctly if + less than 512 is written or read */ + noecc = (from != (from | 0x1ff) + 1) || (len < 0x200); + + if (cmd) + ret = doc_read_ecc(this, from, len, + &n, (u_char*)buf, + noecc ? NULL : eccbuf); + else + ret = doc_write_ecc(this, from, len, + &n, (u_char*)buf, + noecc ? NULL : eccbuf); + + if (ret) + break; + + from += n; + buf += n; + total += n; + len -= n; + } + + if (retlen) + *retlen = total; + + return ret; +} + +void doc_print(struct DiskOnChip *this) { + printf("%s at 0x%lX,\n" + "\t %d chip%s %s, size %d MB, \n" + "\t total size %ld MB, sector size %ld kB\n", + this->name, this->physadr, this->numchips, + this->numchips>1 ? "s" : "", this->chips_name, + 1 << (this->chipshift - 20), + this->totlen >> 20, this->erasesize >> 10); + + if (this->nftl_found) { + struct NFTLrecord *nftl = &this->nftl; + unsigned long bin_size, flash_size; + + bin_size = nftl->nb_boot_blocks * this->erasesize; + flash_size = (nftl->nb_blocks - nftl->nb_boot_blocks) * this->erasesize; + + printf("\t NFTL boot record:\n" + "\t Binary partition: size %ld%s\n" + "\t Flash disk partition: size %ld%s, offset 0x%lx\n", + bin_size > (1 << 20) ? bin_size >> 20 : bin_size >> 10, + bin_size > (1 << 20) ? "MB" : "kB", + flash_size > (1 << 20) ? flash_size >> 20 : flash_size >> 10, + flash_size > (1 << 20) ? "MB" : "kB", bin_size); + } else { + puts ("\t No NFTL boot record found.\n"); + } +} + +/* ------------------------------------------------------------------------- */ + +/* This function is needed to avoid calls of the __ashrdi3 function. */ +static int shr(int val, int shift) { + return val >> shift; +} + +/* Perform the required delay cycles by reading from the appropriate register */ +static void DoC_Delay(struct DiskOnChip *doc, unsigned short cycles) +{ + volatile char dummy; + int i; + + for (i = 0; i < cycles; i++) { + if (DoC_is_Millennium(doc)) + dummy = ReadDOC(doc->virtadr, NOP); + else + dummy = ReadDOC(doc->virtadr, DOCStatus); + } + +} + +/* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */ +static int _DoC_WaitReady(struct DiskOnChip *doc) +{ + unsigned long docptr = doc->virtadr; + unsigned long start = get_timer(0); + +#ifdef PSYCHO_DEBUG + puts ("_DoC_WaitReady called for out-of-line wait\n"); +#endif + + /* Out-of-line routine to wait for chip response */ + while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) { +#ifdef CFG_DOC_SHORT_TIMEOUT + /* it seems that after a certain time the DoC deasserts + * the CDSN_CTRL_FR_B although it is not ready... + * using a short timout solve this (timer increments every ms) */ + if (get_timer(start) > 10) { + return DOC_ETIMEOUT; + } +#else + if (get_timer(start) > 10 * 1000) { + puts ("_DoC_WaitReady timed out.\n"); + return DOC_ETIMEOUT; + } +#endif + udelay(1); + } + + return 0; +} + +static int DoC_WaitReady(struct DiskOnChip *doc) +{ + unsigned long docptr = doc->virtadr; + /* This is inline, to optimise the common case, where it's ready instantly */ + int ret = 0; + + /* 4 read form NOP register should be issued in prior to the read from CDSNControl + see Software Requirement 11.4 item 2. */ + DoC_Delay(doc, 4); + + if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) + /* Call the out-of-line routine to wait */ + ret = _DoC_WaitReady(doc); + + /* issue 2 read from NOP register after reading from CDSNControl register + see Software Requirement 11.4 item 2. */ + DoC_Delay(doc, 2); + + return ret; +} + +/* DoC_Command: Send a flash command to the flash chip through the CDSN Slow IO register to + bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is + required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ + +static inline int DoC_Command(struct DiskOnChip *doc, unsigned char command, + unsigned char xtraflags) +{ + unsigned long docptr = doc->virtadr; + + if (DoC_is_2000(doc)) + xtraflags |= CDSN_CTRL_FLASH_IO; + + /* Assert the CLE (Command Latch Enable) line to the flash chip */ + WriteDOC(xtraflags | CDSN_CTRL_CLE | CDSN_CTRL_CE, docptr, CDSNControl); + DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ + + if (DoC_is_Millennium(doc)) + WriteDOC(command, docptr, CDSNSlowIO); + + /* Send the command */ + WriteDOC_(command, docptr, doc->ioreg); + + /* Lower the CLE line */ + WriteDOC(xtraflags | CDSN_CTRL_CE, docptr, CDSNControl); + DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ + + /* Wait for the chip to respond - Software requirement 11.4.1 (extended for any command) */ + return DoC_WaitReady(doc); +} + +/* DoC_Address: Set the current address for the flash chip through the CDSN Slow IO register to + bypass the internal pipeline. Each of 4 delay cycles (read from the NOP register) is + required after writing to CDSN Control register, see Software Requirement 11.4 item 3. */ + +static int DoC_Address(struct DiskOnChip *doc, int numbytes, unsigned long ofs, + unsigned char xtraflags1, unsigned char xtraflags2) +{ + unsigned long docptr; + int i; + + docptr = doc->virtadr; + + if (DoC_is_2000(doc)) + xtraflags1 |= CDSN_CTRL_FLASH_IO; + + /* Assert the ALE (Address Latch Enable) line to the flash chip */ + WriteDOC(xtraflags1 | CDSN_CTRL_ALE | CDSN_CTRL_CE, docptr, CDSNControl); + + DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ + + /* Send the address */ + /* Devices with 256-byte page are addressed as: + Column (bits 0-7), Page (bits 8-15, 16-23, 24-31) + * there is no device on the market with page256 + and more than 24 bits. + Devices with 512-byte page are addressed as: + Column (bits 0-7), Page (bits 9-16, 17-24, 25-31) + * 25-31 is sent only if the chip support it. + * bit 8 changes the read command to be sent + (NAND_CMD_READ0 or NAND_CMD_READ1). + */ + + if (numbytes == ADDR_COLUMN || numbytes == ADDR_COLUMN_PAGE) { + if (DoC_is_Millennium(doc)) + WriteDOC(ofs & 0xff, docptr, CDSNSlowIO); + WriteDOC_(ofs & 0xff, docptr, doc->ioreg); + } + + if (doc->page256) { + ofs = ofs >> 8; + } else { + ofs = ofs >> 9; + } + + if (numbytes == ADDR_PAGE || numbytes == ADDR_COLUMN_PAGE) { + for (i = 0; i < doc->pageadrlen; i++, ofs = ofs >> 8) { + if (DoC_is_Millennium(doc)) + WriteDOC(ofs & 0xff, docptr, CDSNSlowIO); + WriteDOC_(ofs & 0xff, docptr, doc->ioreg); + } + } + + DoC_Delay(doc, 2); /* Needed for some slow flash chips. mf. */ + + /* FIXME: The SlowIO's for millennium could be replaced by + a single WritePipeTerm here. mf. */ + + /* Lower the ALE line */ + WriteDOC(xtraflags1 | xtraflags2 | CDSN_CTRL_CE, docptr, + CDSNControl); + + DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ + + /* Wait for the chip to respond - Software requirement 11.4.1 */ + return DoC_WaitReady(doc); +} + +/* Read a buffer from DoC, taking care of Millennium odditys */ +static void DoC_ReadBuf(struct DiskOnChip *doc, u_char * buf, int len) +{ + volatile int dummy; + int modulus = 0xffff; + unsigned long docptr; + int i; + + docptr = doc->virtadr; + + if (len <= 0) + return; + + if (DoC_is_Millennium(doc)) { + /* Read the data via the internal pipeline through CDSN IO register, + see Pipelined Read Operations 11.3 */ + dummy = ReadDOC(docptr, ReadPipeInit); + + /* Millennium should use the LastDataRead register - Pipeline Reads */ + len--; + + /* This is needed for correctly ECC calculation */ + modulus = 0xff; + } + + for (i = 0; i < len; i++) + buf[i] = ReadDOC_(docptr, doc->ioreg + (i & modulus)); + + if (DoC_is_Millennium(doc)) { + buf[i] = ReadDOC(docptr, LastDataRead); + } +} + +/* Write a buffer to DoC, taking care of Millennium odditys */ +static void DoC_WriteBuf(struct DiskOnChip *doc, const u_char * buf, int len) +{ + unsigned long docptr; + int i; + + docptr = doc->virtadr; + + if (len <= 0) + return; + + for (i = 0; i < len; i++) + WriteDOC_(buf[i], docptr, doc->ioreg + i); + + if (DoC_is_Millennium(doc)) { + WriteDOC(0x00, docptr, WritePipeTerm); + } +} + + +/* DoC_SelectChip: Select a given flash chip within the current floor */ + +static inline int DoC_SelectChip(struct DiskOnChip *doc, int chip) +{ + unsigned long docptr = doc->virtadr; + + /* Software requirement 11.4.4 before writing DeviceSelect */ + /* Deassert the CE line to eliminate glitches on the FCE# outputs */ + WriteDOC(CDSN_CTRL_WP, docptr, CDSNControl); + DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ + + /* Select the individual flash chip requested */ + WriteDOC(chip, docptr, CDSNDeviceSelect); + DoC_Delay(doc, 4); + + /* Reassert the CE line */ + WriteDOC(CDSN_CTRL_CE | CDSN_CTRL_FLASH_IO | CDSN_CTRL_WP, docptr, + CDSNControl); + DoC_Delay(doc, 4); /* Software requirement 11.4.3 for Millennium */ + + /* Wait for it to be ready */ + return DoC_WaitReady(doc); +} + +/* DoC_SelectFloor: Select a given floor (bank of flash chips) */ + +static inline int DoC_SelectFloor(struct DiskOnChip *doc, int floor) +{ + unsigned long docptr = doc->virtadr; + + /* Select the floor (bank) of chips required */ + WriteDOC(floor, docptr, FloorSelect); + + /* Wait for the chip to be ready */ + return DoC_WaitReady(doc); +} + +/* DoC_IdentChip: Identify a given NAND chip given {floor,chip} */ + +static int DoC_IdentChip(struct DiskOnChip *doc, int floor, int chip) +{ + int mfr, id, i; + volatile char dummy; + + /* Page in the required floor/chip */ + DoC_SelectFloor(doc, floor); + DoC_SelectChip(doc, chip); + + /* Reset the chip */ + if (DoC_Command(doc, NAND_CMD_RESET, CDSN_CTRL_WP)) { +#ifdef DOC_DEBUG + printf("DoC_Command (reset) for %d,%d returned true\n", + floor, chip); +#endif + return 0; + } + + + /* Read the NAND chip ID: 1. Send ReadID command */ + if (DoC_Command(doc, NAND_CMD_READID, CDSN_CTRL_WP)) { +#ifdef DOC_DEBUG + printf("DoC_Command (ReadID) for %d,%d returned true\n", + floor, chip); +#endif + return 0; + } + + /* Read the NAND chip ID: 2. Send address byte zero */ + DoC_Address(doc, ADDR_COLUMN, 0, CDSN_CTRL_WP, 0); + + /* Read the manufacturer and device id codes from the device */ + + /* CDSN Slow IO register see Software Requirement 11.4 item 5. */ + dummy = ReadDOC(doc->virtadr, CDSNSlowIO); + DoC_Delay(doc, 2); + mfr = ReadDOC_(doc->virtadr, doc->ioreg); + + /* CDSN Slow IO register see Software Requirement 11.4 item 5. */ + dummy = ReadDOC(doc->virtadr, CDSNSlowIO); + DoC_Delay(doc, 2); + id = ReadDOC_(doc->virtadr, doc->ioreg); + + /* No response - return failure */ + if (mfr == 0xff || mfr == 0) + return 0; + + /* Check it's the same as the first chip we identified. + * M-Systems say that any given DiskOnChip device should only + * contain _one_ type of flash part, although that's not a + * hardware restriction. */ + if (doc->mfr) { + if (doc->mfr == mfr && doc->id == id) + return 1; /* This is another the same the first */ + else + printf("Flash chip at floor %d, chip %d is different:\n", + floor, chip); + } + + /* Print and store the manufacturer and ID codes. */ + for (i = 0; nand_flash_ids[i].name != NULL; i++) { + if (mfr == nand_flash_ids[i].manufacture_id && + id == nand_flash_ids[i].model_id) { +#ifdef DOC_DEBUG + printf("Flash chip found: Manufacturer ID: %2.2X, " + "Chip ID: %2.2X (%s)\n", mfr, id, + nand_flash_ids[i].name); +#endif + if (!doc->mfr) { + doc->mfr = mfr; + doc->id = id; + doc->chipshift = + nand_flash_ids[i].chipshift; + doc->page256 = nand_flash_ids[i].page256; + doc->pageadrlen = + nand_flash_ids[i].pageadrlen; + doc->erasesize = + nand_flash_ids[i].erasesize; + doc->chips_name = + nand_flash_ids[i].name; + return 1; + } + return 0; + } + } + + +#ifdef DOC_DEBUG + /* We haven't fully identified the chip. Print as much as we know. */ + printf("Unknown flash chip found: %2.2X %2.2X\n", + id, mfr); +#endif + + return 0; +} + +/* DoC_ScanChips: Find all NAND chips present in a DiskOnChip, and identify them */ + +static void DoC_ScanChips(struct DiskOnChip *this) +{ + int floor, chip; + int numchips[MAX_FLOORS]; + int maxchips = MAX_CHIPS; + int ret = 1; + + this->numchips = 0; + this->mfr = 0; + this->id = 0; + + if (DoC_is_Millennium(this)) + maxchips = MAX_CHIPS_MIL; + + /* For each floor, find the number of valid chips it contains */ + for (floor = 0; floor < MAX_FLOORS; floor++) { + ret = 1; + numchips[floor] = 0; + for (chip = 0; chip < maxchips && ret != 0; chip++) { + + ret = DoC_IdentChip(this, floor, chip); + if (ret) { + numchips[floor]++; + this->numchips++; + } + } + } + + /* If there are none at all that we recognise, bail */ + if (!this->numchips) { + puts ("No flash chips recognised.\n"); + return; + } + + /* Allocate an array to hold the information for each chip */ + this->chips = malloc(sizeof(struct Nand) * this->numchips); + if (!this->chips) { + puts ("No memory for allocating chip info structures\n"); + return; + } + + ret = 0; + + /* Fill out the chip array with {floor, chipno} for each + * detected chip in the device. */ + for (floor = 0; floor < MAX_FLOORS; floor++) { + for (chip = 0; chip < numchips[floor]; chip++) { + this->chips[ret].floor = floor; + this->chips[ret].chip = chip; + this->chips[ret].curadr = 0; + this->chips[ret].curmode = 0x50; + ret++; + } + } + + /* Calculate and print the total size of the device */ + this->totlen = this->numchips * (1 << this->chipshift); + +#ifdef DOC_DEBUG + printf("%d flash chips found. Total DiskOnChip size: %ld MB\n", + this->numchips, this->totlen >> 20); +#endif +} + +/* find_boot_record: Find the NFTL Media Header and its Spare copy which contains the + * various device information of the NFTL partition and Bad Unit Table. Update + * the ReplUnitTable[] table accroding to the Bad Unit Table. ReplUnitTable[] + * is used for management of Erase Unit in other routines in nftl.c and nftlmount.c + */ +static int find_boot_record(struct NFTLrecord *nftl) +{ + struct nftl_uci1 h1; + struct nftl_oob oob; + unsigned int block, boot_record_count = 0; + int retlen; + u8 buf[SECTORSIZE]; + struct NFTLMediaHeader *mh = &nftl->MediaHdr; + unsigned int i; + + nftl->MediaUnit = BLOCK_NIL; + nftl->SpareMediaUnit = BLOCK_NIL; + + /* search for a valid boot record */ + for (block = 0; block < nftl->nb_blocks; block++) { + int ret; + + /* Check for ANAND header first. Then can whinge if it's found but later + checks fail */ + if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize, SECTORSIZE, + &retlen, buf, NULL))) { + static int warncount = 5; + + if (warncount) { + printf("Block read at 0x%x failed\n", block * nftl->EraseSize); + if (!--warncount) + puts ("Further failures for this block will not be printed\n"); + } + continue; + } + + if (retlen < 6 || memcmp(buf, "ANAND", 6)) { + /* ANAND\0 not found. Continue */ +#ifdef PSYCHO_DEBUG + printf("ANAND header not found at 0x%x\n", block * nftl->EraseSize); +#endif + continue; + } + +#ifdef NFTL_DEBUG + printf("ANAND header found at 0x%x\n", block * nftl->EraseSize); +#endif + + /* To be safer with BIOS, also use erase mark as discriminant */ + if ((ret = doc_read_oob(nftl->mtd, block * nftl->EraseSize + SECTORSIZE + 8, + 8, &retlen, (char *)&h1) < 0)) { +#ifdef NFTL_DEBUG + printf("ANAND header found at 0x%x, but OOB data read failed\n", + block * nftl->EraseSize); +#endif + continue; + } + + /* OK, we like it. */ + + if (boot_record_count) { + /* We've already processed one. So we just check if + this one is the same as the first one we found */ + if (memcmp(mh, buf, sizeof(struct NFTLMediaHeader))) { +#ifdef NFTL_DEBUG + printf("NFTL Media Headers at 0x%x and 0x%x disagree.\n", + nftl->MediaUnit * nftl->EraseSize, block * nftl->EraseSize); +#endif + /* if (debug) Print both side by side */ + return -1; + } + if (boot_record_count == 1) + nftl->SpareMediaUnit = block; + + boot_record_count++; + continue; + } + + /* This is the first we've seen. Copy the media header structure into place */ + memcpy(mh, buf, sizeof(struct NFTLMediaHeader)); + + /* Do some sanity checks on it */ + if (mh->UnitSizeFactor != 0xff) { + puts ("Sorry, we don't support UnitSizeFactor " + "of != 1 yet.\n"); + return -1; + } + + nftl->nb_boot_blocks = le16_to_cpu(mh->FirstPhysicalEUN); + if ((nftl->nb_boot_blocks + 2) >= nftl->nb_blocks) { + printf ("NFTL Media Header sanity check failed:\n" + "nb_boot_blocks (%d) + 2 > nb_blocks (%d)\n", + nftl->nb_boot_blocks, nftl->nb_blocks); + return -1; + } + + nftl->numvunits = le32_to_cpu(mh->FormattedSize) / nftl->EraseSize; + if (nftl->numvunits > (nftl->nb_blocks - nftl->nb_boot_blocks - 2)) { + printf ("NFTL Media Header sanity check failed:\n" + "numvunits (%d) > nb_blocks (%d) - nb_boot_blocks(%d) - 2\n", + nftl->numvunits, + nftl->nb_blocks, + nftl->nb_boot_blocks); + return -1; + } + + nftl->nr_sects = nftl->numvunits * (nftl->EraseSize / SECTORSIZE); + + /* If we're not using the last sectors in the device for some reason, + reduce nb_blocks accordingly so we forget they're there */ + nftl->nb_blocks = le16_to_cpu(mh->NumEraseUnits) + le16_to_cpu(mh->FirstPhysicalEUN); + + /* read the Bad Erase Unit Table and modify ReplUnitTable[] accordingly */ + for (i = 0; i < nftl->nb_blocks; i++) { + if ((i & (SECTORSIZE - 1)) == 0) { + /* read one sector for every SECTORSIZE of blocks */ + if ((ret = doc_read_ecc(nftl->mtd, block * nftl->EraseSize + + i + SECTORSIZE, SECTORSIZE, + &retlen, buf, (char *)&oob)) < 0) { + puts ("Read of bad sector table failed\n"); + return -1; + } + } + /* mark the Bad Erase Unit as RESERVED in ReplUnitTable */ + if (buf[i & (SECTORSIZE - 1)] != 0xff) + nftl->ReplUnitTable[i] = BLOCK_RESERVED; + } + + nftl->MediaUnit = block; + boot_record_count++; + + } /* foreach (block) */ + + return boot_record_count?0:-1; +} + +/* This routine is made available to other mtd code via + * inter_module_register. It must only be accessed through + * inter_module_get which will bump the use count of this module. The + * addresses passed back in mtd are valid as long as the use count of + * this module is non-zero, i.e. between inter_module_get and + * inter_module_put. Keith Owens <kaos@ocs.com.au> 29 Oct 2000. + */ +static void DoC2k_init(struct DiskOnChip* this) +{ + struct NFTLrecord *nftl; + + switch (this->ChipID) { + case DOC_ChipID_Doc2k: + this->name = "DiskOnChip 2000"; + this->ioreg = DoC_2k_CDSN_IO; + break; + case DOC_ChipID_DocMil: + this->name = "DiskOnChip Millennium"; + this->ioreg = DoC_Mil_CDSN_IO; + break; + } + +#ifdef DOC_DEBUG + printf("%s found at address 0x%lX\n", this->name, + this->physadr); +#endif + + this->totlen = 0; + this->numchips = 0; + + this->curfloor = -1; + this->curchip = -1; + + /* Ident all the chips present. */ + DoC_ScanChips(this); + + nftl = &this->nftl; + + /* Get physical parameters */ + nftl->EraseSize = this->erasesize; + nftl->nb_blocks = this->totlen / this->erasesize; + nftl->mtd = this; + + if (find_boot_record(nftl) != 0) + this->nftl_found = 0; + else + this->nftl_found = 1; + + printf("%s @ 0x%lX, %ld MB\n", this->name, this->physadr, this->totlen >> 20); +} + +int doc_read_ecc(struct DiskOnChip* this, loff_t from, size_t len, + size_t * retlen, u_char * buf, u_char * eccbuf) +{ + unsigned long docptr; + struct Nand *mychip; + unsigned char syndrome[6]; + volatile char dummy; + int i, len256 = 0, ret=0; + + docptr = this->virtadr; + + /* Don't allow read past end of device */ + if (from >= this->totlen) { + puts ("Out of flash\n"); + return DOC_EINVAL; + } + + /* Don't allow a single read to cross a 512-byte block boundary */ + if (from + len > ((from | 0x1ff) + 1)) + len = ((from | 0x1ff) + 1) - from; + + /* The ECC will not be calculated correctly if less than 512 is read */ + if (len != 0x200 && eccbuf) + printf("ECC needs a full sector read (adr: %lx size %lx)\n", + (long) from, (long) len); + +#ifdef PHYCH_DEBUG + printf("DoC_Read (adr: %lx size %lx)\n", (long) from, (long) len); +#endif + + /* Find the chip which is to be used and select it */ + mychip = &this->chips[shr(from, this->chipshift)]; + + if (this->curfloor != mychip->floor) { + DoC_SelectFloor(this, mychip->floor); + DoC_SelectChip(this, mychip->chip); + } else if (this->curchip != mychip->chip) { + DoC_SelectChip(this, mychip->chip); + } + + this->curfloor = mychip->floor; + this->curchip = mychip->chip; + + DoC_Command(this, + (!this->page256 + && (from & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0, + CDSN_CTRL_WP); + DoC_Address(this, ADDR_COLUMN_PAGE, from, CDSN_CTRL_WP, + CDSN_CTRL_ECC_IO); + + if (eccbuf) { + /* Prime the ECC engine */ + WriteDOC(DOC_ECC_RESET, docptr, ECCConf); + WriteDOC(DOC_ECC_EN, docptr, ECCConf); + } else { + /* disable the ECC engine */ + WriteDOC(DOC_ECC_RESET, docptr, ECCConf); + WriteDOC(DOC_ECC_DIS, docptr, ECCConf); + } + + /* treat crossing 256-byte sector for 2M x 8bits devices */ + if (this->page256 && from + len > (from | 0xff) + 1) { + len256 = (from | 0xff) + 1 - from; + DoC_ReadBuf(this, buf, len256); + + DoC_Command(this, NAND_CMD_READ0, CDSN_CTRL_WP); + DoC_Address(this, ADDR_COLUMN_PAGE, from + len256, + CDSN_CTRL_WP, CDSN_CTRL_ECC_IO); + } + + DoC_ReadBuf(this, &buf[len256], len - len256); + + /* Let the caller know we completed it */ + *retlen = len; + + if (eccbuf) { + /* Read the ECC data through the DiskOnChip ECC logic */ + /* Note: this will work even with 2M x 8bit devices as */ + /* they have 8 bytes of OOB per 256 page. mf. */ + DoC_ReadBuf(this, eccbuf, 6); + + /* Flush the pipeline */ + if (DoC_is_Millennium(this)) { + dummy = ReadDOC(docptr, ECCConf); + dummy = ReadDOC(docptr, ECCConf); + i = ReadDOC(docptr, ECCConf); + } else { + dummy = ReadDOC(docptr, 2k_ECCStatus); + dummy = ReadDOC(docptr, 2k_ECCStatus); + i = ReadDOC(docptr, 2k_ECCStatus); + } + + /* Check the ECC Status */ + if (i & 0x80) { + int nb_errors; + /* There was an ECC error */ +#ifdef ECC_DEBUG + printf("DiskOnChip ECC Error: Read at %lx\n", (long)from); +#endif + /* Read the ECC syndrom through the DiskOnChip ECC logic. + These syndrome will be all ZERO when there is no error */ + for (i = 0; i < 6; i++) { + syndrome[i] = + ReadDOC(docptr, ECCSyndrome0 + i); + } + nb_errors = doc_decode_ecc(buf, syndrome); + +#ifdef ECC_DEBUG + printf("Errors corrected: %x\n", nb_errors); +#endif + if (nb_errors < 0) { + /* We return error, but have actually done the read. Not that + this can be told to user-space, via sys_read(), but at least + MTD-aware stuff can know about it by checking *retlen */ + printf("ECC Errors at %lx\n", (long)from); + ret = DOC_EECC; + } + } + +#ifdef PSYCHO_DEBUG + printf("ECC DATA at %lxB: %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", + (long)from, eccbuf[0], eccbuf[1], eccbuf[2], + eccbuf[3], eccbuf[4], eccbuf[5]); +#endif + + /* disable the ECC engine */ + WriteDOC(DOC_ECC_DIS, docptr , ECCConf); + } + + /* according to 11.4.1, we need to wait for the busy line + * drop if we read to the end of the page. */ + if(0 == ((from + *retlen) & 0x1ff)) + { + DoC_WaitReady(this); + } + + return ret; +} + +int doc_write_ecc(struct DiskOnChip* this, loff_t to, size_t len, + size_t * retlen, const u_char * buf, + u_char * eccbuf) +{ + int di; /* Yes, DI is a hangover from when I was disassembling the binary driver */ + unsigned long docptr; + volatile char dummy; + int len256 = 0; + struct Nand *mychip; + + docptr = this->virtadr; + + /* Don't allow write past end of device */ + if (to >= this->totlen) { + puts ("Out of flash\n"); + return DOC_EINVAL; + } + + /* Don't allow a single write to cross a 512-byte block boundary */ + if (to + len > ((to | 0x1ff) + 1)) + len = ((to | 0x1ff) + 1) - to; + + /* The ECC will not be calculated correctly if less than 512 is written */ + if (len != 0x200 && eccbuf) + printf("ECC needs a full sector write (adr: %lx size %lx)\n", + (long) to, (long) len); + + /* printf("DoC_Write (adr: %lx size %lx)\n", (long) to, (long) len); */ + + /* Find the chip which is to be used and select it */ + mychip = &this->chips[shr(to, this->chipshift)]; + + if (this->curfloor != mychip->floor) { + DoC_SelectFloor(this, mychip->floor); + DoC_SelectChip(this, mychip->chip); + } else if (this->curchip != mychip->chip) { + DoC_SelectChip(this, mychip->chip); + } + + this->curfloor = mychip->floor; + this->curchip = mychip->chip; + + /* Set device to main plane of flash */ + DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP); + DoC_Command(this, + (!this->page256 + && (to & 0x100)) ? NAND_CMD_READ1 : NAND_CMD_READ0, + CDSN_CTRL_WP); + + DoC_Command(this, NAND_CMD_SEQIN, 0); + DoC_Address(this, ADDR_COLUMN_PAGE, to, 0, CDSN_CTRL_ECC_IO); + + if (eccbuf) { + /* Prime the ECC engine */ + WriteDOC(DOC_ECC_RESET, docptr, ECCConf); + WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf); + } else { + /* disable the ECC engine */ + WriteDOC(DOC_ECC_RESET, docptr, ECCConf); + WriteDOC(DOC_ECC_DIS, docptr, ECCConf); + } + + /* treat crossing 256-byte sector for 2M x 8bits devices */ + if (this->page256 && to + len > (to | 0xff) + 1) { + len256 = (to | 0xff) + 1 - to; + DoC_WriteBuf(this, buf, len256); + + DoC_Command(this, NAND_CMD_PAGEPROG, 0); + + DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); + /* There's an implicit DoC_WaitReady() in DoC_Command */ + + dummy = ReadDOC(docptr, CDSNSlowIO); + DoC_Delay(this, 2); + + if (ReadDOC_(docptr, this->ioreg) & 1) { + puts ("Error programming flash\n"); + /* Error in programming */ + *retlen = 0; + return DOC_EIO; + } + + DoC_Command(this, NAND_CMD_SEQIN, 0); + DoC_Address(this, ADDR_COLUMN_PAGE, to + len256, 0, + CDSN_CTRL_ECC_IO); + } + + DoC_WriteBuf(this, &buf[len256], len - len256); + + if (eccbuf) { + WriteDOC(CDSN_CTRL_ECC_IO | CDSN_CTRL_CE, docptr, + CDSNControl); + + if (DoC_is_Millennium(this)) { + WriteDOC(0, docptr, NOP); + WriteDOC(0, docptr, NOP); + WriteDOC(0, docptr, NOP); + } else { + WriteDOC_(0, docptr, this->ioreg); + WriteDOC_(0, docptr, this->ioreg); + WriteDOC_(0, docptr, this->ioreg); + } + + /* Read the ECC data through the DiskOnChip ECC logic */ + for (di = 0; di < 6; di++) { + eccbuf[di] = ReadDOC(docptr, ECCSyndrome0 + di); + } + + /* Reset the ECC engine */ + WriteDOC(DOC_ECC_DIS, docptr, ECCConf); + +#ifdef PSYCHO_DEBUG + printf + ("OOB data at %lx is %2.2X %2.2X %2.2X %2.2X %2.2X %2.2X\n", + (long) to, eccbuf[0], eccbuf[1], eccbuf[2], eccbuf[3], + eccbuf[4], eccbuf[5]); +#endif + } + + DoC_Command(this, NAND_CMD_PAGEPROG, 0); + + DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); + /* There's an implicit DoC_WaitReady() in DoC_Command */ + + dummy = ReadDOC(docptr, CDSNSlowIO); + DoC_Delay(this, 2); + + if (ReadDOC_(docptr, this->ioreg) & 1) { + puts ("Error programming flash\n"); + /* Error in programming */ + *retlen = 0; + return DOC_EIO; + } + + /* Let the caller know we completed it */ + *retlen = len; + + if (eccbuf) { + unsigned char x[8]; + size_t dummy; + int ret; + + /* Write the ECC data to flash */ + for (di=0; di<6; di++) + x[di] = eccbuf[di]; + + x[6]=0x55; + x[7]=0x55; + + ret = doc_write_oob(this, to, 8, &dummy, x); + return ret; + } + return 0; +} + +int doc_read_oob(struct DiskOnChip* this, loff_t ofs, size_t len, + size_t * retlen, u_char * buf) +{ + int len256 = 0, ret; + unsigned long docptr; + struct Nand *mychip; + + docptr = this->virtadr; + + mychip = &this->chips[shr(ofs, this->chipshift)]; + + if (this->curfloor != mychip->floor) { + DoC_SelectFloor(this, mychip->floor); + DoC_SelectChip(this, mychip->chip); + } else if (this->curchip != mychip->chip) { + DoC_SelectChip(this, mychip->chip); + } + this->curfloor = mychip->floor; + this->curchip = mychip->chip; + + /* update address for 2M x 8bit devices. OOB starts on the second */ + /* page to maintain compatibility with doc_read_ecc. */ + if (this->page256) { + if (!(ofs & 0x8)) + ofs += 0x100; + else + ofs -= 0x8; + } + + DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); + DoC_Address(this, ADDR_COLUMN_PAGE, ofs, CDSN_CTRL_WP, 0); + + /* treat crossing 8-byte OOB data for 2M x 8bit devices */ + /* Note: datasheet says it should automaticaly wrap to the */ + /* next OOB block, but it didn't work here. mf. */ + if (this->page256 && ofs + len > (ofs | 0x7) + 1) { + len256 = (ofs | 0x7) + 1 - ofs; + DoC_ReadBuf(this, buf, len256); + + DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); + DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), + CDSN_CTRL_WP, 0); + } + + DoC_ReadBuf(this, &buf[len256], len - len256); + + *retlen = len; + /* Reading the full OOB data drops us off of the end of the page, + * causing the flash device to go into busy mode, so we need + * to wait until ready 11.4.1 and Toshiba TC58256FT docs */ + + ret = DoC_WaitReady(this); + + return ret; + +} + +int doc_write_oob(struct DiskOnChip* this, loff_t ofs, size_t len, + size_t * retlen, const u_char * buf) +{ + int len256 = 0; + unsigned long docptr = this->virtadr; + struct Nand *mychip = &this->chips[shr(ofs, this->chipshift)]; + volatile int dummy; + +#ifdef PSYCHO_DEBUG + printf("doc_write_oob(%lx, %d): %2.2X %2.2X %2.2X %2.2X ... %2.2X %2.2X .. %2.2X %2.2X\n", + (long)ofs, len, buf[0], buf[1], buf[2], buf[3], + buf[8], buf[9], buf[14],buf[15]); +#endif + + /* Find the chip which is to be used and select it */ + if (this->curfloor != mychip->floor) { + DoC_SelectFloor(this, mychip->floor); + DoC_SelectChip(this, mychip->chip); + } else if (this->curchip != mychip->chip) { + DoC_SelectChip(this, mychip->chip); + } + this->curfloor = mychip->floor; + this->curchip = mychip->chip; + + /* disable the ECC engine */ + WriteDOC (DOC_ECC_RESET, docptr, ECCConf); + WriteDOC (DOC_ECC_DIS, docptr, ECCConf); + + /* Reset the chip, see Software Requirement 11.4 item 1. */ + DoC_Command(this, NAND_CMD_RESET, CDSN_CTRL_WP); + + /* issue the Read2 command to set the pointer to the Spare Data Area. */ + DoC_Command(this, NAND_CMD_READOOB, CDSN_CTRL_WP); + + /* update address for 2M x 8bit devices. OOB starts on the second */ + /* page to maintain compatibility with doc_read_ecc. */ + if (this->page256) { + if (!(ofs & 0x8)) + ofs += 0x100; + else + ofs -= 0x8; + } + + /* issue the Serial Data In command to initial the Page Program process */ + DoC_Command(this, NAND_CMD_SEQIN, 0); + DoC_Address(this, ADDR_COLUMN_PAGE, ofs, 0, 0); + + /* treat crossing 8-byte OOB data for 2M x 8bit devices */ + /* Note: datasheet says it should automaticaly wrap to the */ + /* next OOB block, but it didn't work here. mf. */ + if (this->page256 && ofs + len > (ofs | 0x7) + 1) { + len256 = (ofs | 0x7) + 1 - ofs; + DoC_WriteBuf(this, buf, len256); + + DoC_Command(this, NAND_CMD_PAGEPROG, 0); + DoC_Command(this, NAND_CMD_STATUS, 0); + /* DoC_WaitReady() is implicit in DoC_Command */ + + dummy = ReadDOC(docptr, CDSNSlowIO); + DoC_Delay(this, 2); + + if (ReadDOC_(docptr, this->ioreg) & 1) { + puts ("Error programming oob data\n"); + /* There was an error */ + *retlen = 0; + return DOC_EIO; + } + DoC_Command(this, NAND_CMD_SEQIN, 0); + DoC_Address(this, ADDR_COLUMN_PAGE, ofs & (~0x1ff), 0, 0); + } + + DoC_WriteBuf(this, &buf[len256], len - len256); + + DoC_Command(this, NAND_CMD_PAGEPROG, 0); + DoC_Command(this, NAND_CMD_STATUS, 0); + /* DoC_WaitReady() is implicit in DoC_Command */ + + dummy = ReadDOC(docptr, CDSNSlowIO); + DoC_Delay(this, 2); + + if (ReadDOC_(docptr, this->ioreg) & 1) { + puts ("Error programming oob data\n"); + /* There was an error */ + *retlen = 0; + return DOC_EIO; + } + + *retlen = len; + return 0; + +} + +int doc_erase(struct DiskOnChip* this, loff_t ofs, size_t len) +{ + volatile int dummy; + unsigned long docptr; + struct Nand *mychip; + + if (ofs & (this->erasesize-1) || len & (this->erasesize-1)) { + puts ("Offset and size must be sector aligned\n"); + return DOC_EINVAL; + } + + docptr = this->virtadr; + + /* FIXME: Do this in the background. Use timers or schedule_task() */ + while(len) { + mychip = &this->chips[shr(ofs, this->chipshift)]; + + if (this->curfloor != mychip->floor) { + DoC_SelectFloor(this, mychip->floor); + DoC_SelectChip(this, mychip->chip); + } else if (this->curchip != mychip->chip) { + DoC_SelectChip(this, mychip->chip); + } + this->curfloor = mychip->floor; + this->curchip = mychip->chip; + + DoC_Command(this, NAND_CMD_ERASE1, 0); + DoC_Address(this, ADDR_PAGE, ofs, 0, 0); + DoC_Command(this, NAND_CMD_ERASE2, 0); + + DoC_Command(this, NAND_CMD_STATUS, CDSN_CTRL_WP); + + dummy = ReadDOC(docptr, CDSNSlowIO); + DoC_Delay(this, 2); + + if (ReadDOC_(docptr, this->ioreg) & 1) { + printf("Error erasing at 0x%lx\n", (long)ofs); + /* There was an error */ + goto callback; + } + ofs += this->erasesize; + len -= this->erasesize; + } + + callback: + return 0; +} + +static inline int doccheck(unsigned long potential, unsigned long physadr) +{ + unsigned long window=potential; + unsigned char tmp, ChipID; +#ifndef DOC_PASSIVE_PROBE + unsigned char tmp2; +#endif + + /* Routine copied from the Linux DOC driver */ + +#ifdef CFG_DOCPROBE_55AA + /* Check for 0x55 0xAA signature at beginning of window, + this is no longer true once we remove the IPL (for Millennium */ + if (ReadDOC(window, Sig1) != 0x55 || ReadDOC(window, Sig2) != 0xaa) + return 0; +#endif /* CFG_DOCPROBE_55AA */ + +#ifndef DOC_PASSIVE_PROBE + /* It's not possible to cleanly detect the DiskOnChip - the + * bootup procedure will put the device into reset mode, and + * it's not possible to talk to it without actually writing + * to the DOCControl register. So we store the current contents + * of the DOCControl register's location, in case we later decide + * that it's not a DiskOnChip, and want to put it back how we + * found it. + */ + tmp2 = ReadDOC(window, DOCControl); + + /* Reset the DiskOnChip ASIC */ + WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, + window, DOCControl); + WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET, + window, DOCControl); + + /* Enable the DiskOnChip ASIC */ + WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, + window, DOCControl); + WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL, + window, DOCControl); +#endif /* !DOC_PASSIVE_PROBE */ + + ChipID = ReadDOC(window, ChipID); + + switch (ChipID) { + case DOC_ChipID_Doc2k: + /* Check the TOGGLE bit in the ECC register */ + tmp = ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT; + if ((ReadDOC(window, 2k_ECCStatus) & DOC_TOGGLE_BIT) != tmp) + return ChipID; + break; + + case DOC_ChipID_DocMil: + /* Check the TOGGLE bit in the ECC register */ + tmp = ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT; + if ((ReadDOC(window, ECCConf) & DOC_TOGGLE_BIT) != tmp) + return ChipID; + break; + + default: +#ifndef CFG_DOCPROBE_55AA +/* + * if the ID isn't the DoC2000 or DoCMillenium ID, so we can assume + * the DOC is missing + */ +# if 0 + printf("Possible DiskOnChip with unknown ChipID %2.2X found at 0x%lx\n", + ChipID, physadr); +# endif +#endif +#ifndef DOC_PASSIVE_PROBE + /* Put back the contents of the DOCControl register, in case it's not + * actually a DiskOnChip. + */ + WriteDOC(tmp2, window, DOCControl); +#endif + return 0; + } + + puts ("DiskOnChip failed TOGGLE test, dropping.\n"); + +#ifndef DOC_PASSIVE_PROBE + /* Put back the contents of the DOCControl register: it's not a DiskOnChip */ + WriteDOC(tmp2, window, DOCControl); +#endif + return 0; +} + +void doc_probe(unsigned long physadr) +{ + struct DiskOnChip *this = NULL; + int i=0, ChipID; + + if ((ChipID = doccheck(physadr, physadr))) { + + for (i=0; i<CFG_MAX_DOC_DEVICE; i++) { + if (doc_dev_desc[i].ChipID == DOC_ChipID_UNKNOWN) { + this = doc_dev_desc + i; + break; + } + } + + if (!this) { + puts ("Cannot allocate memory for data structures.\n"); + return; + } + + if (curr_device == -1) + curr_device = i; + + memset((char *)this, 0, sizeof(struct DiskOnChip)); + + this->virtadr = physadr; + this->physadr = physadr; + this->ChipID = ChipID; + + DoC2k_init(this); + } else { + puts ("No DiskOnChip found\n"); + } +} + +#endif /* (CONFIG_COMMANDS & CFG_CMD_DOC) */ |