Initial revision
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) */