Rewrite of NAND code based on what is in 2.6.12 Linux kernel
Patch by Ladislav Michl, 29 Jun 2005
diff --git a/drivers/nand/diskonchip.c b/drivers/nand/diskonchip.c
new file mode 100644
index 0000000..02135c3
--- /dev/null
+++ b/drivers/nand/diskonchip.c
@@ -0,0 +1,1782 @@
+/*
+ * drivers/mtd/nand/diskonchip.c
+ *
+ * (C) 2003 Red Hat, Inc.
+ * (C) 2004 Dan Brown <dan_brown@ieee.org>
+ * (C) 2004 Kalev Lember <kalev@smartlink.ee>
+ *
+ * Author: David Woodhouse <dwmw2@infradead.org>
+ * Additional Diskonchip 2000 and Millennium support by Dan Brown <dan_brown@ieee.org>
+ * Diskonchip Millennium Plus support by Kalev Lember <kalev@smartlink.ee>
+ *
+ * Error correction code lifted from the old docecc code
+ * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
+ * Copyright (C) 2000 Netgem S.A.
+ * converted to the generic Reed-Solomon library by Thomas Gleixner <tglx@linutronix.de>
+ *
+ * Interface to generic NAND code for M-Systems DiskOnChip devices
+ *
+ * $Id: diskonchip.c,v 1.45 2005/01/05 18:05:14 dwmw2 Exp $
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/rslib.h>
+#include <linux/moduleparam.h>
+#include <asm/io.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/doc2000.h>
+#include <linux/mtd/compatmac.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/inftl.h>
+
+/* Where to look for the devices? */
+#ifndef CONFIG_MTD_DISKONCHIP_PROBE_ADDRESS
+#define CONFIG_MTD_DISKONCHIP_PROBE_ADDRESS 0
+#endif
+
+static unsigned long __initdata doc_locations[] = {
+#if defined (__alpha__) || defined(__i386__) || defined(__x86_64__)
+#ifdef CONFIG_MTD_DISKONCHIP_PROBE_HIGH
+ 0xfffc8000, 0xfffca000, 0xfffcc000, 0xfffce000,
+ 0xfffd0000, 0xfffd2000, 0xfffd4000, 0xfffd6000,
+ 0xfffd8000, 0xfffda000, 0xfffdc000, 0xfffde000,
+ 0xfffe0000, 0xfffe2000, 0xfffe4000, 0xfffe6000,
+ 0xfffe8000, 0xfffea000, 0xfffec000, 0xfffee000,
+#else /* CONFIG_MTD_DOCPROBE_HIGH */
+ 0xc8000, 0xca000, 0xcc000, 0xce000,
+ 0xd0000, 0xd2000, 0xd4000, 0xd6000,
+ 0xd8000, 0xda000, 0xdc000, 0xde000,
+ 0xe0000, 0xe2000, 0xe4000, 0xe6000,
+ 0xe8000, 0xea000, 0xec000, 0xee000,
+#endif /* CONFIG_MTD_DOCPROBE_HIGH */
+#elif defined(__PPC__)
+ 0xe4000000,
+#elif defined(CONFIG_MOMENCO_OCELOT)
+ 0x2f000000,
+ 0xff000000,
+#elif defined(CONFIG_MOMENCO_OCELOT_G) || defined (CONFIG_MOMENCO_OCELOT_C)
+ 0xff000000,
+##else
+#warning Unknown architecture for DiskOnChip. No default probe locations defined
+#endif
+ 0xffffffff };
+
+static struct mtd_info *doclist = NULL;
+
+struct doc_priv {
+ void __iomem *virtadr;
+ unsigned long physadr;
+ u_char ChipID;
+ u_char CDSNControl;
+ int chips_per_floor; /* The number of chips detected on each floor */
+ int curfloor;
+ int curchip;
+ int mh0_page;
+ int mh1_page;
+ struct mtd_info *nextdoc;
+};
+
+/* Max number of eraseblocks to scan (from start of device) for the (I)NFTL
+ MediaHeader. The spec says to just keep going, I think, but that's just
+ silly. */
+#define MAX_MEDIAHEADER_SCAN 8
+
+/* This is the syndrome computed by the HW ecc generator upon reading an empty
+ page, one with all 0xff for data and stored ecc code. */
+static u_char empty_read_syndrome[6] = { 0x26, 0xff, 0x6d, 0x47, 0x73, 0x7a };
+/* This is the ecc value computed by the HW ecc generator upon writing an empty
+ page, one with all 0xff for data. */
+static u_char empty_write_ecc[6] = { 0x4b, 0x00, 0xe2, 0x0e, 0x93, 0xf7 };
+
+#define INFTL_BBT_RESERVED_BLOCKS 4
+
+#define DoC_is_MillenniumPlus(doc) ((doc)->ChipID == DOC_ChipID_DocMilPlus16 || (doc)->ChipID == DOC_ChipID_DocMilPlus32)
+#define DoC_is_Millennium(doc) ((doc)->ChipID == DOC_ChipID_DocMil)
+#define DoC_is_2000(doc) ((doc)->ChipID == DOC_ChipID_Doc2k)
+
+static void doc200x_hwcontrol(struct mtd_info *mtd, int cmd);
+static void doc200x_select_chip(struct mtd_info *mtd, int chip);
+
+static int debug=0;
+module_param(debug, int, 0);
+
+static int try_dword=1;
+module_param(try_dword, int, 0);
+
+static int no_ecc_failures=0;
+module_param(no_ecc_failures, int, 0);
+
+#ifdef CONFIG_MTD_PARTITIONS
+static int no_autopart=0;
+module_param(no_autopart, int, 0);
+#endif
+
+#ifdef MTD_NAND_DISKONCHIP_BBTWRITE
+static int inftl_bbt_write=1;
+#else
+static int inftl_bbt_write=0;
+#endif
+module_param(inftl_bbt_write, int, 0);
+
+static unsigned long doc_config_location = CONFIG_MTD_DISKONCHIP_PROBE_ADDRESS;
+module_param(doc_config_location, ulong, 0);
+MODULE_PARM_DESC(doc_config_location, "Physical memory address at which to probe for DiskOnChip");
+
+
+/* Sector size for HW ECC */
+#define SECTOR_SIZE 512
+/* The sector bytes are packed into NB_DATA 10 bit words */
+#define NB_DATA (((SECTOR_SIZE + 1) * 8 + 6) / 10)
+/* Number of roots */
+#define NROOTS 4
+/* First consective root */
+#define FCR 510
+/* Number of symbols */
+#define NN 1023
+
+/* the Reed Solomon control structure */
+static struct rs_control *rs_decoder;
+
+/*
+ * The HW decoder in the DoC ASIC's provides us a error syndrome,
+ * which we must convert to a standard syndrom usable by the generic
+ * Reed-Solomon library code.
+ *
+ * Fabrice Bellard figured this out in the old docecc code. I added
+ * some comments, improved a minor bit and converted it to make use
+ * of the generic Reed-Solomon libary. tglx
+ */
+static int doc_ecc_decode (struct rs_control *rs, uint8_t *data, uint8_t *ecc)
+{
+ int i, j, nerr, errpos[8];
+ uint8_t parity;
+ uint16_t ds[4], s[5], tmp, errval[8], syn[4];
+
+ /* Convert the ecc bytes into words */
+ ds[0] = ((ecc[4] & 0xff) >> 0) | ((ecc[5] & 0x03) << 8);
+ ds[1] = ((ecc[5] & 0xfc) >> 2) | ((ecc[2] & 0x0f) << 6);
+ ds[2] = ((ecc[2] & 0xf0) >> 4) | ((ecc[3] & 0x3f) << 4);
+ ds[3] = ((ecc[3] & 0xc0) >> 6) | ((ecc[0] & 0xff) << 2);
+ parity = ecc[1];
+
+ /* Initialize the syndrom buffer */
+ for (i = 0; i < NROOTS; i++)
+ s[i] = ds[0];
+ /*
+ * Evaluate
+ * s[i] = ds[3]x^3 + ds[2]x^2 + ds[1]x^1 + ds[0]
+ * where x = alpha^(FCR + i)
+ */
+ for(j = 1; j < NROOTS; j++) {
+ if(ds[j] == 0)
+ continue;
+ tmp = rs->index_of[ds[j]];
+ for(i = 0; i < NROOTS; i++)
+ s[i] ^= rs->alpha_to[rs_modnn(rs, tmp + (FCR + i) * j)];
+ }
+
+ /* Calc s[i] = s[i] / alpha^(v + i) */
+ for (i = 0; i < NROOTS; i++) {
+ if (syn[i])
+ syn[i] = rs_modnn(rs, rs->index_of[s[i]] + (NN - FCR - i));
+ }
+ /* Call the decoder library */
+ nerr = decode_rs16(rs, NULL, NULL, 1019, syn, 0, errpos, 0, errval);
+
+ /* Incorrectable errors ? */
+ if (nerr < 0)
+ return nerr;
+
+ /*
+ * Correct the errors. The bitpositions are a bit of magic,
+ * but they are given by the design of the de/encoder circuit
+ * in the DoC ASIC's.
+ */
+ for(i = 0;i < nerr; i++) {
+ int index, bitpos, pos = 1015 - errpos[i];
+ uint8_t val;
+ if (pos >= NB_DATA && pos < 1019)
+ continue;
+ if (pos < NB_DATA) {
+ /* extract bit position (MSB first) */
+ pos = 10 * (NB_DATA - 1 - pos) - 6;
+ /* now correct the following 10 bits. At most two bytes
+ can be modified since pos is even */
+ index = (pos >> 3) ^ 1;
+ bitpos = pos & 7;
+ if ((index >= 0 && index < SECTOR_SIZE) ||
+ index == (SECTOR_SIZE + 1)) {
+ val = (uint8_t) (errval[i] >> (2 + bitpos));
+ parity ^= val;
+ if (index < SECTOR_SIZE)
+ data[index] ^= val;
+ }
+ index = ((pos >> 3) + 1) ^ 1;
+ bitpos = (bitpos + 10) & 7;
+ if (bitpos == 0)
+ bitpos = 8;
+ if ((index >= 0 && index < SECTOR_SIZE) ||
+ index == (SECTOR_SIZE + 1)) {
+ val = (uint8_t)(errval[i] << (8 - bitpos));
+ parity ^= val;
+ if (index < SECTOR_SIZE)
+ data[index] ^= val;
+ }
+ }
+ }
+ /* If the parity is wrong, no rescue possible */
+ return parity ? -1 : nerr;
+}
+
+static void DoC_Delay(struct doc_priv *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 if (DoC_is_MillenniumPlus(doc))
+ dummy = ReadDOC(doc->virtadr, Mplus_NOP);
+ else
+ dummy = ReadDOC(doc->virtadr, DOCStatus);
+ }
+
+}
+
+#define CDSN_CTRL_FR_B_MASK (CDSN_CTRL_FR_B0 | CDSN_CTRL_FR_B1)
+
+/* DOC_WaitReady: Wait for RDY line to be asserted by the flash chip */
+static int _DoC_WaitReady(struct doc_priv *doc)
+{
+ void __iomem *docptr = doc->virtadr;
+ unsigned long timeo = jiffies + (HZ * 10);
+
+ if(debug) printk("_DoC_WaitReady...\n");
+ /* Out-of-line routine to wait for chip response */
+ if (DoC_is_MillenniumPlus(doc)) {
+ while ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
+ if (time_after(jiffies, timeo)) {
+ printk("_DoC_WaitReady timed out.\n");
+ return -EIO;
+ }
+ udelay(1);
+ cond_resched();
+ }
+ } else {
+ while (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
+ if (time_after(jiffies, timeo)) {
+ printk("_DoC_WaitReady timed out.\n");
+ return -EIO;
+ }
+ udelay(1);
+ cond_resched();
+ }
+ }
+
+ return 0;
+}
+
+static inline int DoC_WaitReady(struct doc_priv *doc)
+{
+ void __iomem *docptr = doc->virtadr;
+ int ret = 0;
+
+ if (DoC_is_MillenniumPlus(doc)) {
+ DoC_Delay(doc, 4);
+
+ if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK)
+ /* Call the out-of-line routine to wait */
+ ret = _DoC_WaitReady(doc);
+ } else {
+ DoC_Delay(doc, 4);
+
+ if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B))
+ /* Call the out-of-line routine to wait */
+ ret = _DoC_WaitReady(doc);
+ DoC_Delay(doc, 2);
+ }
+
+ if(debug) printk("DoC_WaitReady OK\n");
+ return ret;
+}
+
+static void doc2000_write_byte(struct mtd_info *mtd, u_char datum)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ if(debug)printk("write_byte %02x\n", datum);
+ WriteDOC(datum, docptr, CDSNSlowIO);
+ WriteDOC(datum, docptr, 2k_CDSN_IO);
+}
+
+static u_char doc2000_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ u_char ret;
+
+ ReadDOC(docptr, CDSNSlowIO);
+ DoC_Delay(doc, 2);
+ ret = ReadDOC(docptr, 2k_CDSN_IO);
+ if (debug) printk("read_byte returns %02x\n", ret);
+ return ret;
+}
+
+static void doc2000_writebuf(struct mtd_info *mtd,
+ const u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+ if (debug)printk("writebuf of %d bytes: ", len);
+ for (i=0; i < len; i++) {
+ WriteDOC_(buf[i], docptr, DoC_2k_CDSN_IO + i);
+ if (debug && i < 16)
+ printk("%02x ", buf[i]);
+ }
+ if (debug) printk("\n");
+}
+
+static void doc2000_readbuf(struct mtd_info *mtd,
+ u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ if (debug)printk("readbuf of %d bytes: ", len);
+
+ for (i=0; i < len; i++) {
+ buf[i] = ReadDOC(docptr, 2k_CDSN_IO + i);
+ }
+}
+
+static void doc2000_readbuf_dword(struct mtd_info *mtd,
+ u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ if (debug) printk("readbuf_dword of %d bytes: ", len);
+
+ if (unlikely((((unsigned long)buf)|len) & 3)) {
+ for (i=0; i < len; i++) {
+ *(uint8_t *)(&buf[i]) = ReadDOC(docptr, 2k_CDSN_IO + i);
+ }
+ } else {
+ for (i=0; i < len; i+=4) {
+ *(uint32_t*)(&buf[i]) = readl(docptr + DoC_2k_CDSN_IO + i);
+ }
+ }
+}
+
+static int doc2000_verifybuf(struct mtd_info *mtd,
+ const u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ for (i=0; i < len; i++)
+ if (buf[i] != ReadDOC(docptr, 2k_CDSN_IO))
+ return -EFAULT;
+ return 0;
+}
+
+static uint16_t __init doc200x_ident_chip(struct mtd_info *mtd, int nr)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ uint16_t ret;
+
+ doc200x_select_chip(mtd, nr);
+ doc200x_hwcontrol(mtd, NAND_CTL_SETCLE);
+ this->write_byte(mtd, NAND_CMD_READID);
+ doc200x_hwcontrol(mtd, NAND_CTL_CLRCLE);
+ doc200x_hwcontrol(mtd, NAND_CTL_SETALE);
+ this->write_byte(mtd, 0);
+ doc200x_hwcontrol(mtd, NAND_CTL_CLRALE);
+
+ ret = this->read_byte(mtd) << 8;
+ ret |= this->read_byte(mtd);
+
+ if (doc->ChipID == DOC_ChipID_Doc2k && try_dword && !nr) {
+ /* First chip probe. See if we get same results by 32-bit access */
+ union {
+ uint32_t dword;
+ uint8_t byte[4];
+ } ident;
+ void __iomem *docptr = doc->virtadr;
+
+ doc200x_hwcontrol(mtd, NAND_CTL_SETCLE);
+ doc2000_write_byte(mtd, NAND_CMD_READID);
+ doc200x_hwcontrol(mtd, NAND_CTL_CLRCLE);
+ doc200x_hwcontrol(mtd, NAND_CTL_SETALE);
+ doc2000_write_byte(mtd, 0);
+ doc200x_hwcontrol(mtd, NAND_CTL_CLRALE);
+
+ ident.dword = readl(docptr + DoC_2k_CDSN_IO);
+ if (((ident.byte[0] << 8) | ident.byte[1]) == ret) {
+ printk(KERN_INFO "DiskOnChip 2000 responds to DWORD access\n");
+ this->read_buf = &doc2000_readbuf_dword;
+ }
+ }
+
+ return ret;
+}
+
+static void __init doc2000_count_chips(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ uint16_t mfrid;
+ int i;
+
+ /* Max 4 chips per floor on DiskOnChip 2000 */
+ doc->chips_per_floor = 4;
+
+ /* Find out what the first chip is */
+ mfrid = doc200x_ident_chip(mtd, 0);
+
+ /* Find how many chips in each floor. */
+ for (i = 1; i < 4; i++) {
+ if (doc200x_ident_chip(mtd, i) != mfrid)
+ break;
+ }
+ doc->chips_per_floor = i;
+ printk(KERN_DEBUG "Detected %d chips per floor.\n", i);
+}
+
+static int doc200x_wait(struct mtd_info *mtd, struct nand_chip *this, int state)
+{
+ struct doc_priv *doc = this->priv;
+
+ int status;
+
+ DoC_WaitReady(doc);
+ this->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
+ DoC_WaitReady(doc);
+ status = (int)this->read_byte(mtd);
+
+ return status;
+}
+
+static void doc2001_write_byte(struct mtd_info *mtd, u_char datum)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ WriteDOC(datum, docptr, CDSNSlowIO);
+ WriteDOC(datum, docptr, Mil_CDSN_IO);
+ WriteDOC(datum, docptr, WritePipeTerm);
+}
+
+static u_char doc2001_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ //ReadDOC(docptr, CDSNSlowIO);
+ /* 11.4.5 -- delay twice to allow extended length cycle */
+ DoC_Delay(doc, 2);
+ ReadDOC(docptr, ReadPipeInit);
+ //return ReadDOC(docptr, Mil_CDSN_IO);
+ return ReadDOC(docptr, LastDataRead);
+}
+
+static void doc2001_writebuf(struct mtd_info *mtd,
+ const u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ for (i=0; i < len; i++)
+ WriteDOC_(buf[i], docptr, DoC_Mil_CDSN_IO + i);
+ /* Terminate write pipeline */
+ WriteDOC(0x00, docptr, WritePipeTerm);
+}
+
+static void doc2001_readbuf(struct mtd_info *mtd,
+ u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ /* Start read pipeline */
+ ReadDOC(docptr, ReadPipeInit);
+
+ for (i=0; i < len-1; i++)
+ buf[i] = ReadDOC(docptr, Mil_CDSN_IO + (i & 0xff));
+
+ /* Terminate read pipeline */
+ buf[i] = ReadDOC(docptr, LastDataRead);
+}
+
+static int doc2001_verifybuf(struct mtd_info *mtd,
+ const u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ /* Start read pipeline */
+ ReadDOC(docptr, ReadPipeInit);
+
+ for (i=0; i < len-1; i++)
+ if (buf[i] != ReadDOC(docptr, Mil_CDSN_IO)) {
+ ReadDOC(docptr, LastDataRead);
+ return i;
+ }
+ if (buf[i] != ReadDOC(docptr, LastDataRead))
+ return i;
+ return 0;
+}
+
+static u_char doc2001plus_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ u_char ret;
+
+ ReadDOC(docptr, Mplus_ReadPipeInit);
+ ReadDOC(docptr, Mplus_ReadPipeInit);
+ ret = ReadDOC(docptr, Mplus_LastDataRead);
+ if (debug) printk("read_byte returns %02x\n", ret);
+ return ret;
+}
+
+static void doc2001plus_writebuf(struct mtd_info *mtd,
+ const u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ if (debug)printk("writebuf of %d bytes: ", len);
+ for (i=0; i < len; i++) {
+ WriteDOC_(buf[i], docptr, DoC_Mil_CDSN_IO + i);
+ if (debug && i < 16)
+ printk("%02x ", buf[i]);
+ }
+ if (debug) printk("\n");
+}
+
+static void doc2001plus_readbuf(struct mtd_info *mtd,
+ u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ if (debug)printk("readbuf of %d bytes: ", len);
+
+ /* Start read pipeline */
+ ReadDOC(docptr, Mplus_ReadPipeInit);
+ ReadDOC(docptr, Mplus_ReadPipeInit);
+
+ for (i=0; i < len-2; i++) {
+ buf[i] = ReadDOC(docptr, Mil_CDSN_IO);
+ if (debug && i < 16)
+ printk("%02x ", buf[i]);
+ }
+
+ /* Terminate read pipeline */
+ buf[len-2] = ReadDOC(docptr, Mplus_LastDataRead);
+ if (debug && i < 16)
+ printk("%02x ", buf[len-2]);
+ buf[len-1] = ReadDOC(docptr, Mplus_LastDataRead);
+ if (debug && i < 16)
+ printk("%02x ", buf[len-1]);
+ if (debug) printk("\n");
+}
+
+static int doc2001plus_verifybuf(struct mtd_info *mtd,
+ const u_char *buf, int len)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+
+ if (debug)printk("verifybuf of %d bytes: ", len);
+
+ /* Start read pipeline */
+ ReadDOC(docptr, Mplus_ReadPipeInit);
+ ReadDOC(docptr, Mplus_ReadPipeInit);
+
+ for (i=0; i < len-2; i++)
+ if (buf[i] != ReadDOC(docptr, Mil_CDSN_IO)) {
+ ReadDOC(docptr, Mplus_LastDataRead);
+ ReadDOC(docptr, Mplus_LastDataRead);
+ return i;
+ }
+ if (buf[len-2] != ReadDOC(docptr, Mplus_LastDataRead))
+ return len-2;
+ if (buf[len-1] != ReadDOC(docptr, Mplus_LastDataRead))
+ return len-1;
+ return 0;
+}
+
+static void doc2001plus_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int floor = 0;
+
+ if(debug)printk("select chip (%d)\n", chip);
+
+ if (chip == -1) {
+ /* Disable flash internally */
+ WriteDOC(0, docptr, Mplus_FlashSelect);
+ return;
+ }
+
+ floor = chip / doc->chips_per_floor;
+ chip -= (floor * doc->chips_per_floor);
+
+ /* Assert ChipEnable and deassert WriteProtect */
+ WriteDOC((DOC_FLASH_CE), docptr, Mplus_FlashSelect);
+ this->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+
+ doc->curchip = chip;
+ doc->curfloor = floor;
+}
+
+static void doc200x_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int floor = 0;
+
+ if(debug)printk("select chip (%d)\n", chip);
+
+ if (chip == -1)
+ return;
+
+ floor = chip / doc->chips_per_floor;
+ chip -= (floor * doc->chips_per_floor);
+
+ /* 11.4.4 -- deassert CE before changing chip */
+ doc200x_hwcontrol(mtd, NAND_CTL_CLRNCE);
+
+ WriteDOC(floor, docptr, FloorSelect);
+ WriteDOC(chip, docptr, CDSNDeviceSelect);
+
+ doc200x_hwcontrol(mtd, NAND_CTL_SETNCE);
+
+ doc->curchip = chip;
+ doc->curfloor = floor;
+}
+
+static void doc200x_hwcontrol(struct mtd_info *mtd, int cmd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ switch(cmd) {
+ case NAND_CTL_SETNCE:
+ doc->CDSNControl |= CDSN_CTRL_CE;
+ break;
+ case NAND_CTL_CLRNCE:
+ doc->CDSNControl &= ~CDSN_CTRL_CE;
+ break;
+ case NAND_CTL_SETCLE:
+ doc->CDSNControl |= CDSN_CTRL_CLE;
+ break;
+ case NAND_CTL_CLRCLE:
+ doc->CDSNControl &= ~CDSN_CTRL_CLE;
+ break;
+ case NAND_CTL_SETALE:
+ doc->CDSNControl |= CDSN_CTRL_ALE;
+ break;
+ case NAND_CTL_CLRALE:
+ doc->CDSNControl &= ~CDSN_CTRL_ALE;
+ break;
+ case NAND_CTL_SETWP:
+ doc->CDSNControl |= CDSN_CTRL_WP;
+ break;
+ case NAND_CTL_CLRWP:
+ doc->CDSNControl &= ~CDSN_CTRL_WP;
+ break;
+ }
+ if (debug)printk("hwcontrol(%d): %02x\n", cmd, doc->CDSNControl);
+ WriteDOC(doc->CDSNControl, docptr, CDSNControl);
+ /* 11.4.3 -- 4 NOPs after CSDNControl write */
+ DoC_Delay(doc, 4);
+}
+
+static void doc2001plus_command (struct mtd_info *mtd, unsigned command, int column, int page_addr)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ /*
+ * Must terminate write pipeline before sending any commands
+ * to the device.
+ */
+ if (command == NAND_CMD_PAGEPROG) {
+ WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0x00, docptr, Mplus_WritePipeTerm);
+ }
+
+ /*
+ * Write out the command to the device.
+ */
+ if (command == NAND_CMD_SEQIN) {
+ int readcmd;
+
+ if (column >= mtd->oobblock) {
+ /* OOB area */
+ column -= mtd->oobblock;
+ readcmd = NAND_CMD_READOOB;
+ } else if (column < 256) {
+ /* First 256 bytes --> READ0 */
+ readcmd = NAND_CMD_READ0;
+ } else {
+ column -= 256;
+ readcmd = NAND_CMD_READ1;
+ }
+ WriteDOC(readcmd, docptr, Mplus_FlashCmd);
+ }
+ WriteDOC(command, docptr, Mplus_FlashCmd);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+
+ if (column != -1 || page_addr != -1) {
+ /* Serially input address */
+ if (column != -1) {
+ /* Adjust columns for 16 bit buswidth */
+ if (this->options & NAND_BUSWIDTH_16)
+ column >>= 1;
+ WriteDOC(column, docptr, Mplus_FlashAddress);
+ }
+ if (page_addr != -1) {
+ WriteDOC((unsigned char) (page_addr & 0xff), docptr, Mplus_FlashAddress);
+ WriteDOC((unsigned char) ((page_addr >> 8) & 0xff), docptr, Mplus_FlashAddress);
+ /* One more address cycle for higher density devices */
+ if (this->chipsize & 0x0c000000) {
+ WriteDOC((unsigned char) ((page_addr >> 16) & 0x0f), docptr, Mplus_FlashAddress);
+ printk("high density\n");
+ }
+ }
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ /* deassert ALE */
+ if (command == NAND_CMD_READ0 || command == NAND_CMD_READ1 || command == NAND_CMD_READOOB || command == NAND_CMD_READID)
+ WriteDOC(0, docptr, Mplus_FlashControl);
+ }
+
+ /*
+ * program and erase have their own busy handlers
+ * status and sequential in needs no delay
+ */
+ switch (command) {
+
+ case NAND_CMD_PAGEPROG:
+ case NAND_CMD_ERASE1:
+ case NAND_CMD_ERASE2:
+ case NAND_CMD_SEQIN:
+ case NAND_CMD_STATUS:
+ return;
+
+ case NAND_CMD_RESET:
+ if (this->dev_ready)
+ break;
+ udelay(this->chip_delay);
+ WriteDOC(NAND_CMD_STATUS, docptr, Mplus_FlashCmd);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ WriteDOC(0, docptr, Mplus_WritePipeTerm);
+ while ( !(this->read_byte(mtd) & 0x40));
+ return;
+
+ /* This applies to read commands */
+ default:
+ /*
+ * If we don't have access to the busy pin, we apply the given
+ * command delay
+ */
+ if (!this->dev_ready) {
+ udelay (this->chip_delay);
+ return;
+ }
+ }
+
+ /* Apply this short delay always to ensure that we do wait tWB in
+ * any case on any machine. */
+ ndelay (100);
+ /* wait until command is processed */
+ while (!this->dev_ready(mtd));
+}
+
+static int doc200x_dev_ready(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ if (DoC_is_MillenniumPlus(doc)) {
+ /* 11.4.2 -- must NOP four times before checking FR/B# */
+ DoC_Delay(doc, 4);
+ if ((ReadDOC(docptr, Mplus_FlashControl) & CDSN_CTRL_FR_B_MASK) != CDSN_CTRL_FR_B_MASK) {
+ if(debug)
+ printk("not ready\n");
+ return 0;
+ }
+ if (debug)printk("was ready\n");
+ return 1;
+ } else {
+ /* 11.4.2 -- must NOP four times before checking FR/B# */
+ DoC_Delay(doc, 4);
+ if (!(ReadDOC(docptr, CDSNControl) & CDSN_CTRL_FR_B)) {
+ if(debug)
+ printk("not ready\n");
+ return 0;
+ }
+ /* 11.4.2 -- Must NOP twice if it's ready */
+ DoC_Delay(doc, 2);
+ if (debug)printk("was ready\n");
+ return 1;
+ }
+}
+
+static int doc200x_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
+{
+ /* This is our last resort if we couldn't find or create a BBT. Just
+ pretend all blocks are good. */
+ return 0;
+}
+
+static void doc200x_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ /* Prime the ECC engine */
+ switch(mode) {
+ case NAND_ECC_READ:
+ WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
+ WriteDOC(DOC_ECC_EN, docptr, ECCConf);
+ break;
+ case NAND_ECC_WRITE:
+ WriteDOC(DOC_ECC_RESET, docptr, ECCConf);
+ WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, ECCConf);
+ break;
+ }
+}
+
+static void doc2001plus_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+
+ /* Prime the ECC engine */
+ switch(mode) {
+ case NAND_ECC_READ:
+ WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
+ WriteDOC(DOC_ECC_EN, docptr, Mplus_ECCConf);
+ break;
+ case NAND_ECC_WRITE:
+ WriteDOC(DOC_ECC_RESET, docptr, Mplus_ECCConf);
+ WriteDOC(DOC_ECC_EN | DOC_ECC_RW, docptr, Mplus_ECCConf);
+ break;
+ }
+}
+
+/* This code is only called on write */
+static int doc200x_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
+ unsigned char *ecc_code)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ int i;
+ int emptymatch = 1;
+
+ /* flush the pipeline */
+ if (DoC_is_2000(doc)) {
+ WriteDOC(doc->CDSNControl & ~CDSN_CTRL_FLASH_IO, docptr, CDSNControl);
+ WriteDOC(0, docptr, 2k_CDSN_IO);
+ WriteDOC(0, docptr, 2k_CDSN_IO);
+ WriteDOC(0, docptr, 2k_CDSN_IO);
+ WriteDOC(doc->CDSNControl, docptr, CDSNControl);
+ } else if (DoC_is_MillenniumPlus(doc)) {
+ WriteDOC(0, docptr, Mplus_NOP);
+ WriteDOC(0, docptr, Mplus_NOP);
+ WriteDOC(0, docptr, Mplus_NOP);
+ } else {
+ WriteDOC(0, docptr, NOP);
+ WriteDOC(0, docptr, NOP);
+ WriteDOC(0, docptr, NOP);
+ }
+
+ for (i = 0; i < 6; i++) {
+ if (DoC_is_MillenniumPlus(doc))
+ ecc_code[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
+ else
+ ecc_code[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
+ if (ecc_code[i] != empty_write_ecc[i])
+ emptymatch = 0;
+ }
+ if (DoC_is_MillenniumPlus(doc))
+ WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
+ else
+ WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
+#if 0
+ /* If emptymatch=1, we might have an all-0xff data buffer. Check. */
+ if (emptymatch) {
+ /* Note: this somewhat expensive test should not be triggered
+ often. It could be optimized away by examining the data in
+ the writebuf routine, and remembering the result. */
+ for (i = 0; i < 512; i++) {
+ if (dat[i] == 0xff) continue;
+ emptymatch = 0;
+ break;
+ }
+ }
+ /* If emptymatch still =1, we do have an all-0xff data buffer.
+ Return all-0xff ecc value instead of the computed one, so
+ it'll look just like a freshly-erased page. */
+ if (emptymatch) memset(ecc_code, 0xff, 6);
+#endif
+ return 0;
+}
+
+static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc)
+{
+ int i, ret = 0;
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ void __iomem *docptr = doc->virtadr;
+ volatile u_char dummy;
+ int emptymatch = 1;
+
+ /* flush the pipeline */
+ if (DoC_is_2000(doc)) {
+ dummy = ReadDOC(docptr, 2k_ECCStatus);
+ dummy = ReadDOC(docptr, 2k_ECCStatus);
+ dummy = ReadDOC(docptr, 2k_ECCStatus);
+ } else if (DoC_is_MillenniumPlus(doc)) {
+ dummy = ReadDOC(docptr, Mplus_ECCConf);
+ dummy = ReadDOC(docptr, Mplus_ECCConf);
+ dummy = ReadDOC(docptr, Mplus_ECCConf);
+ } else {
+ dummy = ReadDOC(docptr, ECCConf);
+ dummy = ReadDOC(docptr, ECCConf);
+ dummy = ReadDOC(docptr, ECCConf);
+ }
+
+ /* Error occured ? */
+ if (dummy & 0x80) {
+ for (i = 0; i < 6; i++) {
+ if (DoC_is_MillenniumPlus(doc))
+ calc_ecc[i] = ReadDOC_(docptr, DoC_Mplus_ECCSyndrome0 + i);
+ else
+ calc_ecc[i] = ReadDOC_(docptr, DoC_ECCSyndrome0 + i);
+ if (calc_ecc[i] != empty_read_syndrome[i])
+ emptymatch = 0;
+ }
+ /* If emptymatch=1, the read syndrome is consistent with an
+ all-0xff data and stored ecc block. Check the stored ecc. */
+ if (emptymatch) {
+ for (i = 0; i < 6; i++) {
+ if (read_ecc[i] == 0xff) continue;
+ emptymatch = 0;
+ break;
+ }
+ }
+ /* If emptymatch still =1, check the data block. */
+ if (emptymatch) {
+ /* Note: this somewhat expensive test should not be triggered
+ often. It could be optimized away by examining the data in
+ the readbuf routine, and remembering the result. */
+ for (i = 0; i < 512; i++) {
+ if (dat[i] == 0xff) continue;
+ emptymatch = 0;
+ break;
+ }
+ }
+ /* If emptymatch still =1, this is almost certainly a freshly-
+ erased block, in which case the ECC will not come out right.
+ We'll suppress the error and tell the caller everything's
+ OK. Because it is. */
+ if (!emptymatch) ret = doc_ecc_decode (rs_decoder, dat, calc_ecc);
+ if (ret > 0)
+ printk(KERN_ERR "doc200x_correct_data corrected %d errors\n", ret);
+ }
+ if (DoC_is_MillenniumPlus(doc))
+ WriteDOC(DOC_ECC_DIS, docptr, Mplus_ECCConf);
+ else
+ WriteDOC(DOC_ECC_DIS, docptr, ECCConf);
+ if (no_ecc_failures && (ret == -1)) {
+ printk(KERN_ERR "suppressing ECC failure\n");
+ ret = 0;
+ }
+ return ret;
+}
+
+//u_char mydatabuf[528];
+
+static struct nand_oobinfo doc200x_oobinfo = {
+ .useecc = MTD_NANDECC_AUTOPLACE,
+ .eccbytes = 6,
+ .eccpos = {0, 1, 2, 3, 4, 5},
+ .oobfree = { {8, 8} }
+};
+
+/* Find the (I)NFTL Media Header, and optionally also the mirror media header.
+ On sucessful return, buf will contain a copy of the media header for
+ further processing. id is the string to scan for, and will presumably be
+ either "ANAND" or "BNAND". If findmirror=1, also look for the mirror media
+ header. The page #s of the found media headers are placed in mh0_page and
+ mh1_page in the DOC private structure. */
+static int __init find_media_headers(struct mtd_info *mtd, u_char *buf,
+ const char *id, int findmirror)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ unsigned offs, end = (MAX_MEDIAHEADER_SCAN << this->phys_erase_shift);
+ int ret;
+ size_t retlen;
+
+ end = min(end, mtd->size); // paranoia
+ for (offs = 0; offs < end; offs += mtd->erasesize) {
+ ret = mtd->read(mtd, offs, mtd->oobblock, &retlen, buf);
+ if (retlen != mtd->oobblock) continue;
+ if (ret) {
+ printk(KERN_WARNING "ECC error scanning DOC at 0x%x\n",
+ offs);
+ }
+ if (memcmp(buf, id, 6)) continue;
+ printk(KERN_INFO "Found DiskOnChip %s Media Header at 0x%x\n", id, offs);
+ if (doc->mh0_page == -1) {
+ doc->mh0_page = offs >> this->page_shift;
+ if (!findmirror) return 1;
+ continue;
+ }
+ doc->mh1_page = offs >> this->page_shift;
+ return 2;
+ }
+ if (doc->mh0_page == -1) {
+ printk(KERN_WARNING "DiskOnChip %s Media Header not found.\n", id);
+ return 0;
+ }
+ /* Only one mediaheader was found. We want buf to contain a
+ mediaheader on return, so we'll have to re-read the one we found. */
+ offs = doc->mh0_page << this->page_shift;
+ ret = mtd->read(mtd, offs, mtd->oobblock, &retlen, buf);
+ if (retlen != mtd->oobblock) {
+ /* Insanity. Give up. */
+ printk(KERN_ERR "Read DiskOnChip Media Header once, but can't reread it???\n");
+ return 0;
+ }
+ return 1;
+}
+
+static inline int __init nftl_partscan(struct mtd_info *mtd,
+ struct mtd_partition *parts)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ int ret = 0;
+ u_char *buf;
+ struct NFTLMediaHeader *mh;
+ const unsigned psize = 1 << this->page_shift;
+ unsigned blocks, maxblocks;
+ int offs, numheaders;
+
+ buf = kmalloc(mtd->oobblock, GFP_KERNEL);
+ if (!buf) {
+ printk(KERN_ERR "DiskOnChip mediaheader kmalloc failed!\n");
+ return 0;
+ }
+ if (!(numheaders=find_media_headers(mtd, buf, "ANAND", 1))) goto out;
+ mh = (struct NFTLMediaHeader *) buf;
+
+//#ifdef CONFIG_MTD_DEBUG_VERBOSE
+// if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
+ printk(KERN_INFO " DataOrgID = %s\n"
+ " NumEraseUnits = %d\n"
+ " FirstPhysicalEUN = %d\n"
+ " FormattedSize = %d\n"
+ " UnitSizeFactor = %d\n",
+ mh->DataOrgID, mh->NumEraseUnits,
+ mh->FirstPhysicalEUN, mh->FormattedSize,
+ mh->UnitSizeFactor);
+//#endif
+
+ blocks = mtd->size >> this->phys_erase_shift;
+ maxblocks = min(32768U, mtd->erasesize - psize);
+
+ if (mh->UnitSizeFactor == 0x00) {
+ /* Auto-determine UnitSizeFactor. The constraints are:
+ - There can be at most 32768 virtual blocks.
+ - There can be at most (virtual block size - page size)
+ virtual blocks (because MediaHeader+BBT must fit in 1).
+ */
+ mh->UnitSizeFactor = 0xff;
+ while (blocks > maxblocks) {
+ blocks >>= 1;
+ maxblocks = min(32768U, (maxblocks << 1) + psize);
+ mh->UnitSizeFactor--;
+ }
+ printk(KERN_WARNING "UnitSizeFactor=0x00 detected. Correct value is assumed to be 0x%02x.\n", mh->UnitSizeFactor);
+ }
+
+ /* NOTE: The lines below modify internal variables of the NAND and MTD
+ layers; variables with have already been configured by nand_scan.
+ Unfortunately, we didn't know before this point what these values
+ should be. Thus, this code is somewhat dependant on the exact
+ implementation of the NAND layer. */
+ if (mh->UnitSizeFactor != 0xff) {
+ this->bbt_erase_shift += (0xff - mh->UnitSizeFactor);
+ mtd->erasesize <<= (0xff - mh->UnitSizeFactor);
+ printk(KERN_INFO "Setting virtual erase size to %d\n", mtd->erasesize);
+ blocks = mtd->size >> this->bbt_erase_shift;
+ maxblocks = min(32768U, mtd->erasesize - psize);
+ }
+
+ if (blocks > maxblocks) {
+ printk(KERN_ERR "UnitSizeFactor of 0x%02x is inconsistent with device size. Aborting.\n", mh->UnitSizeFactor);
+ goto out;
+ }
+
+ /* Skip past the media headers. */
+ offs = max(doc->mh0_page, doc->mh1_page);
+ offs <<= this->page_shift;
+ offs += mtd->erasesize;
+
+ //parts[0].name = " DiskOnChip Boot / Media Header partition";
+ //parts[0].offset = 0;
+ //parts[0].size = offs;
+
+ parts[0].name = " DiskOnChip BDTL partition";
+ parts[0].offset = offs;
+ parts[0].size = (mh->NumEraseUnits - numheaders) << this->bbt_erase_shift;
+
+ offs += parts[0].size;
+ if (offs < mtd->size) {
+ parts[1].name = " DiskOnChip Remainder partition";
+ parts[1].offset = offs;
+ parts[1].size = mtd->size - offs;
+ ret = 2;
+ goto out;
+ }
+ ret = 1;
+out:
+ kfree(buf);
+ return ret;
+}
+
+/* This is a stripped-down copy of the code in inftlmount.c */
+static inline int __init inftl_partscan(struct mtd_info *mtd,
+ struct mtd_partition *parts)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ int ret = 0;
+ u_char *buf;
+ struct INFTLMediaHeader *mh;
+ struct INFTLPartition *ip;
+ int numparts = 0;
+ int blocks;
+ int vshift, lastvunit = 0;
+ int i;
+ int end = mtd->size;
+
+ if (inftl_bbt_write)
+ end -= (INFTL_BBT_RESERVED_BLOCKS << this->phys_erase_shift);
+
+ buf = kmalloc(mtd->oobblock, GFP_KERNEL);
+ if (!buf) {
+ printk(KERN_ERR "DiskOnChip mediaheader kmalloc failed!\n");
+ return 0;
+ }
+
+ if (!find_media_headers(mtd, buf, "BNAND", 0)) goto out;
+ doc->mh1_page = doc->mh0_page + (4096 >> this->page_shift);
+ mh = (struct INFTLMediaHeader *) buf;
+
+ mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
+ mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
+ mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
+ mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
+ mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
+ mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
+
+//#ifdef CONFIG_MTD_DEBUG_VERBOSE
+// if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
+ printk(KERN_INFO " bootRecordID = %s\n"
+ " NoOfBootImageBlocks = %d\n"
+ " NoOfBinaryPartitions = %d\n"
+ " NoOfBDTLPartitions = %d\n"
+ " BlockMultiplerBits = %d\n"
+ " FormatFlgs = %d\n"
+ " OsakVersion = %d.%d.%d.%d\n"
+ " PercentUsed = %d\n",
+ mh->bootRecordID, mh->NoOfBootImageBlocks,
+ mh->NoOfBinaryPartitions,
+ mh->NoOfBDTLPartitions,
+ mh->BlockMultiplierBits, mh->FormatFlags,
+ ((unsigned char *) &mh->OsakVersion)[0] & 0xf,
+ ((unsigned char *) &mh->OsakVersion)[1] & 0xf,
+ ((unsigned char *) &mh->OsakVersion)[2] & 0xf,
+ ((unsigned char *) &mh->OsakVersion)[3] & 0xf,
+ mh->PercentUsed);
+//#endif
+
+ vshift = this->phys_erase_shift + mh->BlockMultiplierBits;
+
+ blocks = mtd->size >> vshift;
+ if (blocks > 32768) {
+ printk(KERN_ERR "BlockMultiplierBits=%d is inconsistent with device size. Aborting.\n", mh->BlockMultiplierBits);
+ goto out;
+ }
+
+ blocks = doc->chips_per_floor << (this->chip_shift - this->phys_erase_shift);
+ if (inftl_bbt_write && (blocks > mtd->erasesize)) {
+ printk(KERN_ERR "Writeable BBTs spanning more than one erase block are not yet supported. FIX ME!\n");
+ goto out;
+ }
+
+ /* Scan the partitions */
+ for (i = 0; (i < 4); i++) {
+ ip = &(mh->Partitions[i]);
+ ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
+ ip->firstUnit = le32_to_cpu(ip->firstUnit);
+ ip->lastUnit = le32_to_cpu(ip->lastUnit);
+ ip->flags = le32_to_cpu(ip->flags);
+ ip->spareUnits = le32_to_cpu(ip->spareUnits);
+ ip->Reserved0 = le32_to_cpu(ip->Reserved0);
+
+//#ifdef CONFIG_MTD_DEBUG_VERBOSE
+// if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
+ printk(KERN_INFO " PARTITION[%d] ->\n"
+ " virtualUnits = %d\n"
+ " firstUnit = %d\n"
+ " lastUnit = %d\n"
+ " flags = 0x%x\n"
+ " spareUnits = %d\n",
+ i, ip->virtualUnits, ip->firstUnit,
+ ip->lastUnit, ip->flags,
+ ip->spareUnits);
+//#endif
+
+/*
+ if ((i == 0) && (ip->firstUnit > 0)) {
+ parts[0].name = " DiskOnChip IPL / Media Header partition";
+ parts[0].offset = 0;
+ parts[0].size = mtd->erasesize * ip->firstUnit;
+ numparts = 1;
+ }
+*/
+
+ if (ip->flags & INFTL_BINARY)
+ parts[numparts].name = " DiskOnChip BDK partition";
+ else
+ parts[numparts].name = " DiskOnChip BDTL partition";
+ parts[numparts].offset = ip->firstUnit << vshift;
+ parts[numparts].size = (1 + ip->lastUnit - ip->firstUnit) << vshift;
+ numparts++;
+ if (ip->lastUnit > lastvunit) lastvunit = ip->lastUnit;
+ if (ip->flags & INFTL_LAST) break;
+ }
+ lastvunit++;
+ if ((lastvunit << vshift) < end) {
+ parts[numparts].name = " DiskOnChip Remainder partition";
+ parts[numparts].offset = lastvunit << vshift;
+ parts[numparts].size = end - parts[numparts].offset;
+ numparts++;
+ }
+ ret = numparts;
+out:
+ kfree(buf);
+ return ret;
+}
+
+static int __init nftl_scan_bbt(struct mtd_info *mtd)
+{
+ int ret, numparts;
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ struct mtd_partition parts[2];
+
+ memset((char *) parts, 0, sizeof(parts));
+ /* On NFTL, we have to find the media headers before we can read the
+ BBTs, since they're stored in the media header eraseblocks. */
+ numparts = nftl_partscan(mtd, parts);
+ if (!numparts) return -EIO;
+ this->bbt_td->options = NAND_BBT_ABSPAGE | NAND_BBT_8BIT |
+ NAND_BBT_SAVECONTENT | NAND_BBT_WRITE |
+ NAND_BBT_VERSION;
+ this->bbt_td->veroffs = 7;
+ this->bbt_td->pages[0] = doc->mh0_page + 1;
+ if (doc->mh1_page != -1) {
+ this->bbt_md->options = NAND_BBT_ABSPAGE | NAND_BBT_8BIT |
+ NAND_BBT_SAVECONTENT | NAND_BBT_WRITE |
+ NAND_BBT_VERSION;
+ this->bbt_md->veroffs = 7;
+ this->bbt_md->pages[0] = doc->mh1_page + 1;
+ } else {
+ this->bbt_md = NULL;
+ }
+
+ /* It's safe to set bd=NULL below because NAND_BBT_CREATE is not set.
+ At least as nand_bbt.c is currently written. */
+ if ((ret = nand_scan_bbt(mtd, NULL)))
+ return ret;
+ add_mtd_device(mtd);
+#ifdef CONFIG_MTD_PARTITIONS
+ if (!no_autopart)
+ add_mtd_partitions(mtd, parts, numparts);
+#endif
+ return 0;
+}
+
+static int __init inftl_scan_bbt(struct mtd_info *mtd)
+{
+ int ret, numparts;
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+ struct mtd_partition parts[5];
+
+ if (this->numchips > doc->chips_per_floor) {
+ printk(KERN_ERR "Multi-floor INFTL devices not yet supported.\n");
+ return -EIO;
+ }
+
+ if (DoC_is_MillenniumPlus(doc)) {
+ this->bbt_td->options = NAND_BBT_2BIT | NAND_BBT_ABSPAGE;
+ if (inftl_bbt_write)
+ this->bbt_td->options |= NAND_BBT_WRITE;
+ this->bbt_td->pages[0] = 2;
+ this->bbt_md = NULL;
+ } else {
+ this->bbt_td->options = NAND_BBT_LASTBLOCK | NAND_BBT_8BIT |
+ NAND_BBT_VERSION;
+ if (inftl_bbt_write)
+ this->bbt_td->options |= NAND_BBT_WRITE;
+ this->bbt_td->offs = 8;
+ this->bbt_td->len = 8;
+ this->bbt_td->veroffs = 7;
+ this->bbt_td->maxblocks = INFTL_BBT_RESERVED_BLOCKS;
+ this->bbt_td->reserved_block_code = 0x01;
+ this->bbt_td->pattern = "MSYS_BBT";
+
+ this->bbt_md->options = NAND_BBT_LASTBLOCK | NAND_BBT_8BIT |
+ NAND_BBT_VERSION;
+ if (inftl_bbt_write)
+ this->bbt_md->options |= NAND_BBT_WRITE;
+ this->bbt_md->offs = 8;
+ this->bbt_md->len = 8;
+ this->bbt_md->veroffs = 7;
+ this->bbt_md->maxblocks = INFTL_BBT_RESERVED_BLOCKS;
+ this->bbt_md->reserved_block_code = 0x01;
+ this->bbt_md->pattern = "TBB_SYSM";
+ }
+
+ /* It's safe to set bd=NULL below because NAND_BBT_CREATE is not set.
+ At least as nand_bbt.c is currently written. */
+ if ((ret = nand_scan_bbt(mtd, NULL)))
+ return ret;
+ memset((char *) parts, 0, sizeof(parts));
+ numparts = inftl_partscan(mtd, parts);
+ /* At least for now, require the INFTL Media Header. We could probably
+ do without it for non-INFTL use, since all it gives us is
+ autopartitioning, but I want to give it more thought. */
+ if (!numparts) return -EIO;
+ add_mtd_device(mtd);
+#ifdef CONFIG_MTD_PARTITIONS
+ if (!no_autopart)
+ add_mtd_partitions(mtd, parts, numparts);
+#endif
+ return 0;
+}
+
+static inline int __init doc2000_init(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+
+ this->write_byte = doc2000_write_byte;
+ this->read_byte = doc2000_read_byte;
+ this->write_buf = doc2000_writebuf;
+ this->read_buf = doc2000_readbuf;
+ this->verify_buf = doc2000_verifybuf;
+ this->scan_bbt = nftl_scan_bbt;
+
+ doc->CDSNControl = CDSN_CTRL_FLASH_IO | CDSN_CTRL_ECC_IO;
+ doc2000_count_chips(mtd);
+ mtd->name = "DiskOnChip 2000 (NFTL Model)";
+ return (4 * doc->chips_per_floor);
+}
+
+static inline int __init doc2001_init(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+
+ this->write_byte = doc2001_write_byte;
+ this->read_byte = doc2001_read_byte;
+ this->write_buf = doc2001_writebuf;
+ this->read_buf = doc2001_readbuf;
+ this->verify_buf = doc2001_verifybuf;
+
+ ReadDOC(doc->virtadr, ChipID);
+ ReadDOC(doc->virtadr, ChipID);
+ ReadDOC(doc->virtadr, ChipID);
+ if (ReadDOC(doc->virtadr, ChipID) != DOC_ChipID_DocMil) {
+ /* It's not a Millennium; it's one of the newer
+ DiskOnChip 2000 units with a similar ASIC.
+ Treat it like a Millennium, except that it
+ can have multiple chips. */
+ doc2000_count_chips(mtd);
+ mtd->name = "DiskOnChip 2000 (INFTL Model)";
+ this->scan_bbt = inftl_scan_bbt;
+ return (4 * doc->chips_per_floor);
+ } else {
+ /* Bog-standard Millennium */
+ doc->chips_per_floor = 1;
+ mtd->name = "DiskOnChip Millennium";
+ this->scan_bbt = nftl_scan_bbt;
+ return 1;
+ }
+}
+
+static inline int __init doc2001plus_init(struct mtd_info *mtd)
+{
+ struct nand_chip *this = mtd->priv;
+ struct doc_priv *doc = this->priv;
+
+ this->write_byte = NULL;
+ this->read_byte = doc2001plus_read_byte;
+ this->write_buf = doc2001plus_writebuf;
+ this->read_buf = doc2001plus_readbuf;
+ this->verify_buf = doc2001plus_verifybuf;
+ this->scan_bbt = inftl_scan_bbt;
+ this->hwcontrol = NULL;
+ this->select_chip = doc2001plus_select_chip;
+ this->cmdfunc = doc2001plus_command;
+ this->enable_hwecc = doc2001plus_enable_hwecc;
+
+ doc->chips_per_floor = 1;
+ mtd->name = "DiskOnChip Millennium Plus";
+
+ return 1;
+}
+
+static inline int __init doc_probe(unsigned long physadr)
+{
+ unsigned char ChipID;
+ struct mtd_info *mtd;
+ struct nand_chip *nand;
+ struct doc_priv *doc;
+ void __iomem *virtadr;
+ unsigned char save_control;
+ unsigned char tmp, tmpb, tmpc;
+ int reg, len, numchips;
+ int ret = 0;
+
+ virtadr = ioremap(physadr, DOC_IOREMAP_LEN);
+ if (!virtadr) {
+ printk(KERN_ERR "Diskonchip ioremap failed: 0x%x bytes at 0x%lx\n", DOC_IOREMAP_LEN, physadr);
+ return -EIO;
+ }
+
+ /* 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.
+ */
+ save_control = ReadDOC(virtadr, DOCControl);
+
+ /* Reset the DiskOnChip ASIC */
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
+ virtadr, DOCControl);
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_RESET,
+ virtadr, DOCControl);
+
+ /* Enable the DiskOnChip ASIC */
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
+ virtadr, DOCControl);
+ WriteDOC(DOC_MODE_CLR_ERR | DOC_MODE_MDWREN | DOC_MODE_NORMAL,
+ virtadr, DOCControl);
+
+ ChipID = ReadDOC(virtadr, ChipID);
+
+ switch(ChipID) {
+ case DOC_ChipID_Doc2k:
+ reg = DoC_2k_ECCStatus;
+ break;
+ case DOC_ChipID_DocMil:
+ reg = DoC_ECCConf;
+ break;
+ case DOC_ChipID_DocMilPlus16:
+ case DOC_ChipID_DocMilPlus32:
+ case 0:
+ /* Possible Millennium Plus, need to do more checks */
+ /* Possibly release from power down mode */
+ for (tmp = 0; (tmp < 4); tmp++)
+ ReadDOC(virtadr, Mplus_Power);
+
+ /* Reset the Millennium Plus ASIC */
+ tmp = DOC_MODE_RESET | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
+ DOC_MODE_BDECT;
+ WriteDOC(tmp, virtadr, Mplus_DOCControl);
+ WriteDOC(~tmp, virtadr, Mplus_CtrlConfirm);
+
+ mdelay(1);
+ /* Enable the Millennium Plus ASIC */
+ tmp = DOC_MODE_NORMAL | DOC_MODE_MDWREN | DOC_MODE_RST_LAT |
+ DOC_MODE_BDECT;
+ WriteDOC(tmp, virtadr, Mplus_DOCControl);
+ WriteDOC(~tmp, virtadr, Mplus_CtrlConfirm);
+ mdelay(1);
+
+ ChipID = ReadDOC(virtadr, ChipID);
+
+ switch (ChipID) {
+ case DOC_ChipID_DocMilPlus16:
+ reg = DoC_Mplus_Toggle;
+ break;
+ case DOC_ChipID_DocMilPlus32:
+ printk(KERN_ERR "DiskOnChip Millennium Plus 32MB is not supported, ignoring.\n");
+ default:
+ ret = -ENODEV;
+ goto notfound;
+ }
+ break;
+
+ default:
+ ret = -ENODEV;
+ goto notfound;
+ }
+ /* Check the TOGGLE bit in the ECC register */
+ tmp = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
+ tmpb = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
+ tmpc = ReadDOC_(virtadr, reg) & DOC_TOGGLE_BIT;
+ if ((tmp == tmpb) || (tmp != tmpc)) {
+ printk(KERN_WARNING "Possible DiskOnChip at 0x%lx failed TOGGLE test, dropping.\n", physadr);
+ ret = -ENODEV;
+ goto notfound;
+ }
+
+ for (mtd = doclist; mtd; mtd = doc->nextdoc) {
+ unsigned char oldval;
+ unsigned char newval;
+ nand = mtd->priv;
+ doc = nand->priv;
+ /* Use the alias resolution register to determine if this is
+ in fact the same DOC aliased to a new address. If writes
+ to one chip's alias resolution register change the value on
+ the other chip, they're the same chip. */
+ if (ChipID == DOC_ChipID_DocMilPlus16) {
+ oldval = ReadDOC(doc->virtadr, Mplus_AliasResolution);
+ newval = ReadDOC(virtadr, Mplus_AliasResolution);
+ } else {
+ oldval = ReadDOC(doc->virtadr, AliasResolution);
+ newval = ReadDOC(virtadr, AliasResolution);
+ }
+ if (oldval != newval)
+ continue;
+ if (ChipID == DOC_ChipID_DocMilPlus16) {
+ WriteDOC(~newval, virtadr, Mplus_AliasResolution);
+ oldval = ReadDOC(doc->virtadr, Mplus_AliasResolution);
+ WriteDOC(newval, virtadr, Mplus_AliasResolution); // restore it
+ } else {
+ WriteDOC(~newval, virtadr, AliasResolution);
+ oldval = ReadDOC(doc->virtadr, AliasResolution);
+ WriteDOC(newval, virtadr, AliasResolution); // restore it
+ }
+ newval = ~newval;
+ if (oldval == newval) {
+ printk(KERN_DEBUG "Found alias of DOC at 0x%lx to 0x%lx\n", doc->physadr, physadr);
+ goto notfound;
+ }
+ }
+
+ printk(KERN_NOTICE "DiskOnChip found at 0x%lx\n", physadr);
+
+ len = sizeof(struct mtd_info) +
+ sizeof(struct nand_chip) +
+ sizeof(struct doc_priv) +
+ (2 * sizeof(struct nand_bbt_descr));
+ mtd = kmalloc(len, GFP_KERNEL);
+ if (!mtd) {
+ printk(KERN_ERR "DiskOnChip kmalloc (%d bytes) failed!\n", len);
+ ret = -ENOMEM;
+ goto fail;
+ }
+ memset(mtd, 0, len);
+
+ nand = (struct nand_chip *) (mtd + 1);
+ doc = (struct doc_priv *) (nand + 1);
+ nand->bbt_td = (struct nand_bbt_descr *) (doc + 1);
+ nand->bbt_md = nand->bbt_td + 1;
+
+ mtd->priv = nand;
+ mtd->owner = THIS_MODULE;
+
+ nand->priv = doc;
+ nand->select_chip = doc200x_select_chip;
+ nand->hwcontrol = doc200x_hwcontrol;
+ nand->dev_ready = doc200x_dev_ready;
+ nand->waitfunc = doc200x_wait;
+ nand->block_bad = doc200x_block_bad;
+ nand->enable_hwecc = doc200x_enable_hwecc;
+ nand->calculate_ecc = doc200x_calculate_ecc;
+ nand->correct_data = doc200x_correct_data;
+
+ nand->autooob = &doc200x_oobinfo;
+ nand->eccmode = NAND_ECC_HW6_512;
+ nand->options = NAND_USE_FLASH_BBT | NAND_HWECC_SYNDROME;
+
+ doc->physadr = physadr;
+ doc->virtadr = virtadr;
+ doc->ChipID = ChipID;
+ doc->curfloor = -1;
+ doc->curchip = -1;
+ doc->mh0_page = -1;
+ doc->mh1_page = -1;
+ doc->nextdoc = doclist;
+
+ if (ChipID == DOC_ChipID_Doc2k)
+ numchips = doc2000_init(mtd);
+ else if (ChipID == DOC_ChipID_DocMilPlus16)
+ numchips = doc2001plus_init(mtd);
+ else
+ numchips = doc2001_init(mtd);
+
+ if ((ret = nand_scan(mtd, numchips))) {
+ /* DBB note: i believe nand_release is necessary here, as
+ buffers may have been allocated in nand_base. Check with
+ Thomas. FIX ME! */
+ /* nand_release will call del_mtd_device, but we haven't yet
+ added it. This is handled without incident by
+ del_mtd_device, as far as I can tell. */
+ nand_release(mtd);
+ kfree(mtd);
+ goto fail;
+ }
+
+ /* Success! */
+ doclist = mtd;
+ return 0;
+
+notfound:
+ /* Put back the contents of the DOCControl register, in case it's not
+ actually a DiskOnChip. */
+ WriteDOC(save_control, virtadr, DOCControl);
+fail:
+ iounmap(virtadr);
+ return ret;
+}
+
+static void release_nanddoc(void)
+{
+ struct mtd_info *mtd, *nextmtd;
+ struct nand_chip *nand;
+ struct doc_priv *doc;
+
+ for (mtd = doclist; mtd; mtd = nextmtd) {
+ nand = mtd->priv;
+ doc = nand->priv;
+
+ nextmtd = doc->nextdoc;
+ nand_release(mtd);
+ iounmap(doc->virtadr);
+ kfree(mtd);
+ }
+}
+
+static int __init init_nanddoc(void)
+{
+ int i, ret = 0;
+
+ /* We could create the decoder on demand, if memory is a concern.
+ * This way we have it handy, if an error happens
+ *
+ * Symbolsize is 10 (bits)
+ * Primitve polynomial is x^10+x^3+1
+ * first consecutive root is 510
+ * primitve element to generate roots = 1
+ * generator polinomial degree = 4
+ */
+ rs_decoder = init_rs(10, 0x409, FCR, 1, NROOTS);
+ if (!rs_decoder) {
+ printk (KERN_ERR "DiskOnChip: Could not create a RS decoder\n");
+ return -ENOMEM;
+ }
+
+ if (doc_config_location) {
+ printk(KERN_INFO "Using configured DiskOnChip probe address 0x%lx\n", doc_config_location);
+ ret = doc_probe(doc_config_location);
+ if (ret < 0)
+ goto outerr;
+ } else {
+ for (i=0; (doc_locations[i] != 0xffffffff); i++) {
+ doc_probe(doc_locations[i]);
+ }
+ }
+ /* No banner message any more. Print a message if no DiskOnChip
+ found, so the user knows we at least tried. */
+ if (!doclist) {
+ printk(KERN_INFO "No valid DiskOnChip devices found\n");
+ ret = -ENODEV;
+ goto outerr;
+ }
+ return 0;
+outerr:
+ free_rs(rs_decoder);
+ return ret;
+}
+
+static void __exit cleanup_nanddoc(void)
+{
+ /* Cleanup the nand/DoC resources */
+ release_nanddoc();
+
+ /* Free the reed solomon resources */
+ if (rs_decoder) {
+ free_rs(rs_decoder);
+ }
+}
+
+module_init(init_nanddoc);
+module_exit(cleanup_nanddoc);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("M-Systems DiskOnChip 2000, Millennium and Millennium Plus device driver\n");