+++ /dev/null
-/*
- * drivers/mtd/nand/docg4.c
- *
- * Copyright (C) 2013 Mike Dunn <mikedunn@newsguy.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * mtd nand driver for M-Systems DiskOnChip G4
- *
- * Tested on the Palm Treo 680. The G4 is also present on Toshiba Portege, Asus
- * P526, some HTC smartphones (Wizard, Prophet, ...), O2 XDA Zinc, maybe others.
- * Should work on these as well. Let me know!
- *
- * TODO:
- *
- * Mechanism for management of password-protected areas
- *
- * Hamming ecc when reading oob only
- *
- * According to the M-Sys documentation, this device is also available in a
- * "dual-die" configuration having a 256MB capacity, but no mechanism for
- * detecting this variant is documented. Currently this driver assumes 128MB
- * capacity.
- *
- * Support for multiple cascaded devices ("floors"). Not sure which gadgets
- * contain multiple G4s in a cascaded configuration, if any.
- */
-
-
-#include <common.h>
-#include <asm/arch/hardware.h>
-#include <asm/io.h>
-#include <asm/bitops.h>
-#include <asm/errno.h>
-#include <malloc.h>
-#include <nand.h>
-#include <linux/bch.h>
-#include <linux/bitrev.h>
-#include <linux/mtd/docg4.h>
-
-/*
- * The device has a nop register which M-Sys claims is for the purpose of
- * inserting precise delays. But beware; at least some operations fail if the
- * nop writes are replaced with a generic delay!
- */
-static inline void write_nop(void __iomem *docptr)
-{
- writew(0, docptr + DOC_NOP);
-}
-
-
-static int poll_status(void __iomem *docptr)
-{
- /*
- * Busy-wait for the FLASHREADY bit to be set in the FLASHCONTROL
- * register. Operations known to take a long time (e.g., block erase)
- * should sleep for a while before calling this.
- */
-
- uint8_t flash_status;
-
- /* hardware quirk requires reading twice initially */
- flash_status = readb(docptr + DOC_FLASHCONTROL);
-
- do {
- flash_status = readb(docptr + DOC_FLASHCONTROL);
- } while (!(flash_status & DOC_CTRL_FLASHREADY));
-
- return 0;
-}
-
-static void write_addr(void __iomem *docptr, uint32_t docg4_addr)
-{
- /* write the four address bytes packed in docg4_addr to the device */
-
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
- docg4_addr >>= 8;
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
- docg4_addr >>= 8;
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
- docg4_addr >>= 8;
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
-}
-
-/*
- * This is a module parameter in the linux kernel version of this driver. It is
- * hard-coded to 'off' for u-boot. This driver uses oob to mark bad blocks.
- * This can be problematic when dealing with data not intended for the mtd/nand
- * subsystem. For example, on boards that boot from the docg4 and use the IPL
- * to load an spl + u-boot image, the blocks containing the image will be
- * reported as "bad" because the oob of the first page of each block contains a
- * magic number that the IPL looks for, which causes the badblock scan to
- * erroneously add them to the bad block table. To erase such a block, use
- * u-boot's 'nand scrub'. scrub is safe for the docg4. The device does have a
- * factory bad block table, but it is read-only, and is used in conjunction with
- * oob bad block markers that are written by mtd/nand when a block is deemed to
- * be bad. To read data from "bad" blocks, use 'read.raw'. Unfortunately,
- * read.raw does not use ecc, which would still work fine on such misidentified
- * bad blocks. TODO: u-boot nand utilities need the ability to ignore bad
- * blocks.
- */
-static const int ignore_badblocks; /* remains false */
-
-struct docg4_priv {
- int status;
- struct {
- unsigned int command;
- int column;
- int page;
- } last_command;
- uint8_t oob_buf[16];
- uint8_t ecc_buf[7];
- int oob_page;
- struct bch_control *bch;
-};
-/*
- * Oob bytes 0 - 6 are available to the user.
- * Byte 7 is hamming ecc for first 7 bytes. Bytes 8 - 14 are hw-generated ecc.
- * Byte 15 (the last) is used by the driver as a "page written" flag.
- */
-static struct nand_ecclayout docg4_oobinfo = {
- .eccbytes = 9,
- .eccpos = {7, 8, 9, 10, 11, 12, 13, 14, 15},
- .oobavail = 7,
- .oobfree = { {0, 7} }
-};
-
-static void reset(void __iomem *docptr)
-{
- /* full device reset */
-
- writew(DOC_ASICMODE_RESET | DOC_ASICMODE_MDWREN, docptr + DOC_ASICMODE);
- writew(~(DOC_ASICMODE_RESET | DOC_ASICMODE_MDWREN),
- docptr + DOC_ASICMODECONFIRM);
- write_nop(docptr);
-
- writew(DOC_ASICMODE_NORMAL | DOC_ASICMODE_MDWREN,
- docptr + DOC_ASICMODE);
- writew(~(DOC_ASICMODE_NORMAL | DOC_ASICMODE_MDWREN),
- docptr + DOC_ASICMODECONFIRM);
-
- writew(DOC_ECCCONF1_ECC_ENABLE, docptr + DOC_ECCCONF1);
-
- poll_status(docptr);
-}
-
-static void docg4_select_chip(struct mtd_info *mtd, int chip)
-{
- /*
- * Select among multiple cascaded chips ("floors"). Multiple floors are
- * not yet supported, so the only valid non-negative value is 0.
- */
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
-
- if (chip < 0)
- return; /* deselected */
-
- if (chip > 0)
- printf("multiple floors currently unsupported\n");
-
- writew(0, docptr + DOC_DEVICESELECT);
-}
-
-static void read_hw_ecc(void __iomem *docptr, uint8_t *ecc_buf)
-{
- /* read the 7 hw-generated ecc bytes */
-
- int i;
- for (i = 0; i < 7; i++) { /* hw quirk; read twice */
- ecc_buf[i] = readb(docptr + DOC_BCH_SYNDROM(i));
- ecc_buf[i] = readb(docptr + DOC_BCH_SYNDROM(i));
- }
-}
-
-static int correct_data(struct mtd_info *mtd, uint8_t *buf, int page)
-{
- /*
- * Called after a page read when hardware reports bitflips.
- * Up to four bitflips can be corrected.
- */
-
- struct nand_chip *nand = mtd->priv;
- struct docg4_priv *doc = nand->priv;
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
- int i, numerrs;
- unsigned int errpos[4];
- const uint8_t blank_read_hwecc[8] = {
- 0xcf, 0x72, 0xfc, 0x1b, 0xa9, 0xc7, 0xb9, 0 };
-
- read_hw_ecc(docptr, doc->ecc_buf); /* read 7 hw-generated ecc bytes */
-
- /* check if read error is due to a blank page */
- if (!memcmp(doc->ecc_buf, blank_read_hwecc, 7))
- return 0; /* yes */
-
- /* skip additional check of "written flag" if ignore_badblocks */
- if (!ignore_badblocks) {
- /*
- * If the hw ecc bytes are not those of a blank page, there's
- * still a chance that the page is blank, but was read with
- * errors. Check the "written flag" in last oob byte, which
- * is set to zero when a page is written. If more than half
- * the bits are set, assume a blank page. Unfortunately, the
- * bit flips(s) are not reported in stats.
- */
-
- if (doc->oob_buf[15]) {
- int bit, numsetbits = 0;
- unsigned long written_flag = doc->oob_buf[15];
-
- for (bit = 0; bit < 8; bit++) {
- if (written_flag & 0x01)
- numsetbits++;
- written_flag >>= 1;
- }
- if (numsetbits > 4) { /* assume blank */
- printf("errors in blank page at offset %08x\n",
- page * DOCG4_PAGE_SIZE);
- return 0;
- }
- }
- }
-
- /*
- * The hardware ecc unit produces oob_ecc ^ calc_ecc. The kernel's bch
- * algorithm is used to decode this. However the hw operates on page
- * data in a bit order that is the reverse of that of the bch alg,
- * requiring that the bits be reversed on the result. Thanks to Ivan
- * Djelic for his analysis!
- */
- for (i = 0; i < 7; i++)
- doc->ecc_buf[i] = bitrev8(doc->ecc_buf[i]);
-
- numerrs = decode_bch(doc->bch, NULL, DOCG4_USERDATA_LEN, NULL,
- doc->ecc_buf, NULL, errpos);
-
- if (numerrs == -EBADMSG) {
- printf("uncorrectable errors at offset %08x\n",
- page * DOCG4_PAGE_SIZE);
- return -EBADMSG;
- }
-
- BUG_ON(numerrs < 0); /* -EINVAL, or anything other than -EBADMSG */
-
- /* undo last step in BCH alg (modulo mirroring not needed) */
- for (i = 0; i < numerrs; i++)
- errpos[i] = (errpos[i] & ~7)|(7-(errpos[i] & 7));
-
- /* fix the errors */
- for (i = 0; i < numerrs; i++) {
- /* ignore if error within oob ecc bytes */
- if (errpos[i] > DOCG4_USERDATA_LEN * 8)
- continue;
-
- /* if error within oob area preceeding ecc bytes... */
- if (errpos[i] > DOCG4_PAGE_SIZE * 8)
- __change_bit(errpos[i] - DOCG4_PAGE_SIZE * 8,
- (unsigned long *)doc->oob_buf);
-
- else /* error in page data */
- __change_bit(errpos[i], (unsigned long *)buf);
- }
-
- printf("%d error(s) corrected at offset %08x\n",
- numerrs, page * DOCG4_PAGE_SIZE);
-
- return numerrs;
-}
-
-static int read_progstatus(struct docg4_priv *doc, void __iomem *docptr)
-{
- /*
- * This apparently checks the status of programming. Done after an
- * erasure, and after page data is written. On error, the status is
- * saved, to be later retrieved by the nand infrastructure code.
- */
-
- /* status is read from the I/O reg */
- uint16_t status1 = readw(docptr + DOC_IOSPACE_DATA);
- uint16_t status2 = readw(docptr + DOC_IOSPACE_DATA);
- uint16_t status3 = readw(docptr + DOCG4_MYSTERY_REG);
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "docg4: %s: %02x %02x %02x\n",
- __func__, status1, status2, status3);
-
- if (status1 != DOCG4_PROGSTATUS_GOOD ||
- status2 != DOCG4_PROGSTATUS_GOOD_2 ||
- status3 != DOCG4_PROGSTATUS_GOOD_2) {
- doc->status = NAND_STATUS_FAIL;
- printf("read_progstatus failed: %02x, %02x, %02x\n",
- status1, status2, status3);
- return -EIO;
- }
- return 0;
-}
-
-static int pageprog(struct mtd_info *mtd)
-{
- /*
- * Final step in writing a page. Writes the contents of its
- * internal buffer out to the flash array, or some such.
- */
-
- struct nand_chip *nand = mtd->priv;
- struct docg4_priv *doc = nand->priv;
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
- int retval = 0;
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "docg4: %s\n", __func__);
-
- writew(DOCG4_SEQ_PAGEPROG, docptr + DOC_FLASHSEQUENCE);
- writew(DOC_CMD_PROG_CYCLE2, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
-
- /* Just busy-wait; usleep_range() slows things down noticeably. */
- poll_status(docptr);
-
- writew(DOCG4_SEQ_FLUSH, docptr + DOC_FLASHSEQUENCE);
- writew(DOCG4_CMD_FLUSH, docptr + DOC_FLASHCOMMAND);
- writew(DOC_ECCCONF0_READ_MODE | 4, docptr + DOC_ECCCONF0);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
-
- retval = read_progstatus(doc, docptr);
- writew(0, docptr + DOC_DATAEND);
- write_nop(docptr);
- poll_status(docptr);
- write_nop(docptr);
-
- return retval;
-}
-
-static void sequence_reset(void __iomem *docptr)
-{
- /* common starting sequence for all operations */
-
- writew(DOC_CTRL_UNKNOWN | DOC_CTRL_CE, docptr + DOC_FLASHCONTROL);
- writew(DOC_SEQ_RESET, docptr + DOC_FLASHSEQUENCE);
- writew(DOC_CMD_RESET, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
- poll_status(docptr);
- write_nop(docptr);
-}
-
-static void read_page_prologue(void __iomem *docptr, uint32_t docg4_addr)
-{
- /* first step in reading a page */
-
- sequence_reset(docptr);
-
- writew(DOCG4_SEQ_PAGE_READ, docptr + DOC_FLASHSEQUENCE);
- writew(DOCG4_CMD_PAGE_READ, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
-
- write_addr(docptr, docg4_addr);
-
- write_nop(docptr);
- writew(DOCG4_CMD_READ2, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
-
- poll_status(docptr);
-}
-
-static void write_page_prologue(void __iomem *docptr, uint32_t docg4_addr)
-{
- /* first step in writing a page */
-
- sequence_reset(docptr);
- writew(DOCG4_SEQ_PAGEWRITE, docptr + DOC_FLASHSEQUENCE);
- writew(DOCG4_CMD_PAGEWRITE, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_addr(docptr, docg4_addr);
- write_nop(docptr);
- write_nop(docptr);
- poll_status(docptr);
-}
-
-static uint32_t mtd_to_docg4_address(int page, int column)
-{
- /*
- * Convert mtd address to format used by the device, 32 bit packed.
- *
- * Some notes on G4 addressing... The M-Sys documentation on this device
- * claims that pages are 2K in length, and indeed, the format of the
- * address used by the device reflects that. But within each page are
- * four 512 byte "sub-pages", each with its own oob data that is
- * read/written immediately after the 512 bytes of page data. This oob
- * data contains the ecc bytes for the preceeding 512 bytes.
- *
- * Rather than tell the mtd nand infrastructure that page size is 2k,
- * with four sub-pages each, we engage in a little subterfuge and tell
- * the infrastructure code that pages are 512 bytes in size. This is
- * done because during the course of reverse-engineering the device, I
- * never observed an instance where an entire 2K "page" was read or
- * written as a unit. Each "sub-page" is always addressed individually,
- * its data read/written, and ecc handled before the next "sub-page" is
- * addressed.
- *
- * This requires us to convert addresses passed by the mtd nand
- * infrastructure code to those used by the device.
- *
- * The address that is written to the device consists of four bytes: the
- * first two are the 2k page number, and the second is the index into
- * the page. The index is in terms of 16-bit half-words and includes
- * the preceeding oob data, so e.g., the index into the second
- * "sub-page" is 0x108, and the full device address of the start of mtd
- * page 0x201 is 0x00800108.
- */
- int g4_page = page / 4; /* device's 2K page */
- int g4_index = (page % 4) * 0x108 + column/2; /* offset into page */
- return (g4_page << 16) | g4_index; /* pack */
-}
-
-static void docg4_command(struct mtd_info *mtd, unsigned command, int column,
- int page_addr)
-{
- /* handle standard nand commands */
-
- struct nand_chip *nand = mtd->priv;
- struct docg4_priv *doc = nand->priv;
- uint32_t g4_addr = mtd_to_docg4_address(page_addr, column);
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s %x, page_addr=%x, column=%x\n",
- __func__, command, page_addr, column);
-
- /*
- * Save the command and its arguments. This enables emulation of
- * standard flash devices, and also some optimizations.
- */
- doc->last_command.command = command;
- doc->last_command.column = column;
- doc->last_command.page = page_addr;
-
- switch (command) {
- case NAND_CMD_RESET:
- reset(CONFIG_SYS_NAND_BASE);
- break;
-
- case NAND_CMD_READ0:
- read_page_prologue(CONFIG_SYS_NAND_BASE, g4_addr);
- break;
-
- case NAND_CMD_STATUS:
- /* next call to read_byte() will expect a status */
- break;
-
- case NAND_CMD_SEQIN:
- write_page_prologue(CONFIG_SYS_NAND_BASE, g4_addr);
-
- /* hack for deferred write of oob bytes */
- if (doc->oob_page == page_addr)
- memcpy(nand->oob_poi, doc->oob_buf, 16);
- break;
-
- case NAND_CMD_PAGEPROG:
- pageprog(mtd);
- break;
-
- /* we don't expect these, based on review of nand_base.c */
- case NAND_CMD_READOOB:
- case NAND_CMD_READID:
- case NAND_CMD_ERASE1:
- case NAND_CMD_ERASE2:
- printf("docg4_command: unexpected nand command 0x%x\n",
- command);
- break;
- }
-}
-
-static void docg4_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
-{
- int i;
- struct nand_chip *nand = mtd->priv;
- uint16_t *p = (uint16_t *)buf;
- len >>= 1;
-
- for (i = 0; i < len; i++)
- p[i] = readw(nand->IO_ADDR_R);
-}
-
-static int docg4_read_oob(struct mtd_info *mtd, struct nand_chip *nand,
- int page)
-{
- struct docg4_priv *doc = nand->priv;
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
- uint16_t status;
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s: page %x\n", __func__, page);
-
- /*
- * Oob bytes are read as part of a normal page read. If the previous
- * nand command was a read of the page whose oob is now being read, just
- * copy the oob bytes that we saved in a local buffer and avoid a
- * separate oob read.
- */
- if (doc->last_command.command == NAND_CMD_READ0 &&
- doc->last_command.page == page) {
- memcpy(nand->oob_poi, doc->oob_buf, 16);
- return 0;
- }
-
- /*
- * Separate read of oob data only.
- */
- docg4_command(mtd, NAND_CMD_READ0, nand->ecc.size, page);
-
- writew(DOC_ECCCONF0_READ_MODE | DOCG4_OOB_SIZE, docptr + DOC_ECCCONF0);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
-
- /* the 1st byte from the I/O reg is a status; the rest is oob data */
- status = readw(docptr + DOC_IOSPACE_DATA);
- if (status & DOCG4_READ_ERROR) {
- printf("docg4_read_oob failed: status = 0x%02x\n", status);
- return -EIO;
- }
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s: status = 0x%x\n", __func__, status);
-
- docg4_read_buf(mtd, nand->oob_poi, 16);
-
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- writew(0, docptr + DOC_DATAEND);
- write_nop(docptr);
-
- return 0;
-}
-
-static int docg4_write_oob(struct mtd_info *mtd, struct nand_chip *nand,
- int page)
-{
- /*
- * Writing oob-only is not really supported, because MLC nand must write
- * oob bytes at the same time as page data. Nonetheless, we save the
- * oob buffer contents here, and then write it along with the page data
- * if the same page is subsequently written. This allows user space
- * utilities that write the oob data prior to the page data to work
- * (e.g., nandwrite). The disdvantage is that, if the intention was to
- * write oob only, the operation is quietly ignored. Also, oob can get
- * corrupted if two concurrent processes are running nandwrite.
- */
-
- /* note that bytes 7..14 are hw generated hamming/ecc and overwritten */
- struct docg4_priv *doc = nand->priv;
- doc->oob_page = page;
- memcpy(doc->oob_buf, nand->oob_poi, 16);
- return 0;
-}
-
-static int docg4_block_neverbad(struct mtd_info *mtd, loff_t ofs, int getchip)
-{
- /* only called when module_param ignore_badblocks is set */
- return 0;
-}
-
-static void docg4_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len)
-{
- int i;
- struct nand_chip *nand = mtd->priv;
- uint16_t *p = (uint16_t *)buf;
- len >>= 1;
-
- for (i = 0; i < len; i++)
- writew(p[i], nand->IO_ADDR_W);
-}
-
-static int write_page(struct mtd_info *mtd, struct nand_chip *nand,
- const uint8_t *buf, int use_ecc)
-{
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
- uint8_t ecc_buf[8];
-
- writew(DOC_ECCCONF0_ECC_ENABLE |
- DOC_ECCCONF0_UNKNOWN |
- DOCG4_BCH_SIZE,
- docptr + DOC_ECCCONF0);
- write_nop(docptr);
-
- /* write the page data */
- docg4_write_buf16(mtd, buf, DOCG4_PAGE_SIZE);
-
- /* oob bytes 0 through 5 are written to I/O reg */
- docg4_write_buf16(mtd, nand->oob_poi, 6);
-
- /* oob byte 6 written to a separate reg */
- writew(nand->oob_poi[6], docptr + DOCG4_OOB_6_7);
-
- write_nop(docptr);
- write_nop(docptr);
-
- /* write hw-generated ecc bytes to oob */
- if (likely(use_ecc)) {
- /* oob byte 7 is hamming code */
- uint8_t hamming = readb(docptr + DOC_HAMMINGPARITY);
- hamming = readb(docptr + DOC_HAMMINGPARITY); /* 2nd read */
- writew(hamming, docptr + DOCG4_OOB_6_7);
- write_nop(docptr);
-
- /* read the 7 bch bytes from ecc regs */
- read_hw_ecc(docptr, ecc_buf);
- ecc_buf[7] = 0; /* clear the "page written" flag */
- }
-
- /* write user-supplied bytes to oob */
- else {
- writew(nand->oob_poi[7], docptr + DOCG4_OOB_6_7);
- write_nop(docptr);
- memcpy(ecc_buf, &nand->oob_poi[8], 8);
- }
-
- docg4_write_buf16(mtd, ecc_buf, 8);
- write_nop(docptr);
- write_nop(docptr);
- writew(0, docptr + DOC_DATAEND);
- write_nop(docptr);
-
- return 0;
-}
-
-static int docg4_write_page_raw(struct mtd_info *mtd, struct nand_chip *nand,
- const uint8_t *buf, int oob_required)
-{
- return write_page(mtd, nand, buf, 0);
-}
-
-static int docg4_write_page(struct mtd_info *mtd, struct nand_chip *nand,
- const uint8_t *buf, int oob_required)
-{
- return write_page(mtd, nand, buf, 1);
-}
-
-static int read_page(struct mtd_info *mtd, struct nand_chip *nand,
- uint8_t *buf, int page, int use_ecc)
-{
- struct docg4_priv *doc = nand->priv;
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
- uint16_t status, edc_err, *buf16;
-
- writew(DOC_ECCCONF0_READ_MODE |
- DOC_ECCCONF0_ECC_ENABLE |
- DOC_ECCCONF0_UNKNOWN |
- DOCG4_BCH_SIZE,
- docptr + DOC_ECCCONF0);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
-
- /* the 1st byte from the I/O reg is a status; the rest is page data */
- status = readw(docptr + DOC_IOSPACE_DATA);
- if (status & DOCG4_READ_ERROR) {
- printf("docg4_read_page: bad status: 0x%02x\n", status);
- writew(0, docptr + DOC_DATAEND);
- return -EIO;
- }
-
- docg4_read_buf(mtd, buf, DOCG4_PAGE_SIZE); /* read the page data */
-
- /* first 14 oob bytes read from I/O reg */
- docg4_read_buf(mtd, nand->oob_poi, 14);
-
- /* last 2 read from another reg */
- buf16 = (uint16_t *)(nand->oob_poi + 14);
- *buf16 = readw(docptr + DOCG4_MYSTERY_REG);
-
- /*
- * Diskonchips read oob immediately after a page read. Mtd
- * infrastructure issues a separate command for reading oob after the
- * page is read. So we save the oob bytes in a local buffer and just
- * copy it if the next command reads oob from the same page.
- */
- memcpy(doc->oob_buf, nand->oob_poi, 16);
-
- write_nop(docptr);
-
- if (likely(use_ecc)) {
- /* read the register that tells us if bitflip(s) detected */
- edc_err = readw(docptr + DOC_ECCCONF1);
- edc_err = readw(docptr + DOC_ECCCONF1);
-
- /* If bitflips are reported, attempt to correct with ecc */
- if (edc_err & DOC_ECCCONF1_BCH_SYNDROM_ERR) {
- int bits_corrected = correct_data(mtd, buf, page);
- if (bits_corrected == -EBADMSG)
- mtd->ecc_stats.failed++;
- else
- mtd->ecc_stats.corrected += bits_corrected;
- }
- }
-
- writew(0, docptr + DOC_DATAEND);
- return 0;
-}
-
-
-static int docg4_read_page_raw(struct mtd_info *mtd, struct nand_chip *nand,
- uint8_t *buf, int oob_required, int page)
-{
- return read_page(mtd, nand, buf, page, 0);
-}
-
-static int docg4_read_page(struct mtd_info *mtd, struct nand_chip *nand,
- uint8_t *buf, int oob_required, int page)
-{
- return read_page(mtd, nand, buf, page, 1);
-}
-
-static int docg4_erase_block(struct mtd_info *mtd, int page)
-{
- struct nand_chip *nand = mtd->priv;
- struct docg4_priv *doc = nand->priv;
- void __iomem *docptr = CONFIG_SYS_NAND_BASE;
- uint16_t g4_page;
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s: page %04x\n", __func__, page);
-
- sequence_reset(docptr);
-
- writew(DOCG4_SEQ_BLOCKERASE, docptr + DOC_FLASHSEQUENCE);
- writew(DOC_CMD_PROG_BLOCK_ADDR, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
-
- /* only 2 bytes of address are written to specify erase block */
- g4_page = (uint16_t)(page / 4); /* to g4's 2k page addressing */
- writeb(g4_page & 0xff, docptr + DOC_FLASHADDRESS);
- g4_page >>= 8;
- writeb(g4_page & 0xff, docptr + DOC_FLASHADDRESS);
- write_nop(docptr);
-
- /* start the erasure */
- writew(DOC_CMD_ERASECYCLE2, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
-
- poll_status(docptr);
- writew(DOCG4_SEQ_FLUSH, docptr + DOC_FLASHSEQUENCE);
- writew(DOCG4_CMD_FLUSH, docptr + DOC_FLASHCOMMAND);
- writew(DOC_ECCCONF0_READ_MODE | 4, docptr + DOC_ECCCONF0);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
-
- read_progstatus(doc, docptr);
-
- writew(0, docptr + DOC_DATAEND);
- write_nop(docptr);
- poll_status(docptr);
- write_nop(docptr);
-
- return nand->waitfunc(mtd, nand);
-}
-
-static int read_factory_bbt(struct mtd_info *mtd)
-{
- /*
- * The device contains a read-only factory bad block table. Read it and
- * update the memory-based bbt accordingly.
- */
-
- struct nand_chip *nand = mtd->priv;
- uint32_t g4_addr = mtd_to_docg4_address(DOCG4_FACTORY_BBT_PAGE, 0);
- uint8_t *buf;
- int i, block, status;
-
- buf = kzalloc(DOCG4_PAGE_SIZE, GFP_KERNEL);
- if (buf == NULL)
- return -ENOMEM;
-
- read_page_prologue(CONFIG_SYS_NAND_BASE, g4_addr);
- status = docg4_read_page(mtd, nand, buf, 0, DOCG4_FACTORY_BBT_PAGE);
- if (status)
- goto exit;
-
- /*
- * If no memory-based bbt was created, exit. This will happen if module
- * parameter ignore_badblocks is set. Then why even call this function?
- * For an unknown reason, block erase always fails if it's the first
- * operation after device power-up. The above read ensures it never is.
- * Ugly, I know.
- */
- if (nand->bbt == NULL) /* no memory-based bbt */
- goto exit;
-
- /*
- * Parse factory bbt and update memory-based bbt. Factory bbt format is
- * simple: one bit per block, block numbers increase left to right (msb
- * to lsb). Bit clear means bad block.
- */
- for (i = block = 0; block < DOCG4_NUMBLOCKS; block += 8, i++) {
- int bitnum;
- uint8_t mask;
- for (bitnum = 0, mask = 0x80;
- bitnum < 8; bitnum++, mask >>= 1) {
- if (!(buf[i] & mask)) {
- int badblock = block + bitnum;
- nand->bbt[badblock / 4] |=
- 0x03 << ((badblock % 4) * 2);
- mtd->ecc_stats.badblocks++;
- printf("factory-marked bad block: %d\n",
- badblock);
- }
- }
- }
- exit:
- kfree(buf);
- return status;
-}
-
-static int docg4_block_markbad(struct mtd_info *mtd, loff_t ofs)
-{
- /*
- * Mark a block as bad. Bad blocks are marked in the oob area of the
- * first page of the block. The default scan_bbt() in the nand
- * infrastructure code works fine for building the memory-based bbt
- * during initialization, as does the nand infrastructure function that
- * checks if a block is bad by reading the bbt. This function replaces
- * the nand default because writes to oob-only are not supported.
- */
-
- int ret, i;
- uint8_t *buf;
- struct nand_chip *nand = mtd->priv;
- struct nand_bbt_descr *bbtd = nand->badblock_pattern;
- int block = (int)(ofs >> nand->bbt_erase_shift);
- int page = (int)(ofs >> nand->page_shift);
- uint32_t g4_addr = mtd_to_docg4_address(page, 0);
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s: %08llx\n", __func__, ofs);
-
- if (unlikely(ofs & (DOCG4_BLOCK_SIZE - 1)))
- printf("%s: ofs %llx not start of block!\n",
- __func__, ofs);
-
- /* allocate blank buffer for page data */
- buf = kzalloc(DOCG4_PAGE_SIZE, GFP_KERNEL);
- if (buf == NULL)
- return -ENOMEM;
-
- /* update bbt in memory */
- nand->bbt[block / 4] |= 0x01 << ((block & 0x03) * 2);
-
- /* write bit-wise negation of pattern to oob buffer */
- memset(nand->oob_poi, 0xff, mtd->oobsize);
- for (i = 0; i < bbtd->len; i++)
- nand->oob_poi[bbtd->offs + i] = ~bbtd->pattern[i];
-
- /* write first page of block */
- write_page_prologue(CONFIG_SYS_NAND_BASE, g4_addr);
- docg4_write_page(mtd, nand, buf, 1);
- ret = pageprog(mtd);
- if (!ret)
- mtd->ecc_stats.badblocks++;
-
- kfree(buf);
-
- return ret;
-}
-
-static uint8_t docg4_read_byte(struct mtd_info *mtd)
-{
- struct nand_chip *nand = mtd->priv;
- struct docg4_priv *doc = nand->priv;
-
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s\n", __func__);
-
- if (doc->last_command.command == NAND_CMD_STATUS) {
- int status;
-
- /*
- * Previous nand command was status request, so nand
- * infrastructure code expects to read the status here. If an
- * error occurred in a previous operation, report it.
- */
- doc->last_command.command = 0;
-
- if (doc->status) {
- status = doc->status;
- doc->status = 0;
- }
-
- /* why is NAND_STATUS_WP inverse logic?? */
- else
- status = NAND_STATUS_WP | NAND_STATUS_READY;
-
- return status;
- }
-
- printf("unexpectd call to read_byte()\n");
-
- return 0;
-}
-
-static int docg4_wait(struct mtd_info *mtd, struct nand_chip *nand)
-{
- struct docg4_priv *doc = nand->priv;
- int status = NAND_STATUS_WP; /* inverse logic?? */
- MTDDEBUG(MTD_DEBUG_LEVEL3, "%s...\n", __func__);
-
- /* report any previously unreported error */
- if (doc->status) {
- status |= doc->status;
- doc->status = 0;
- return status;
- }
-
- status |= poll_status(CONFIG_SYS_NAND_BASE);
- return status;
-}
-
-int docg4_nand_init(struct mtd_info *mtd, struct nand_chip *nand, int devnum)
-{
- uint16_t id1, id2;
- struct docg4_priv *docg4;
- int retval;
-
- docg4 = kzalloc(sizeof(*docg4), GFP_KERNEL);
- if (!docg4)
- return -1;
-
- mtd->priv = nand;
- nand->priv = docg4;
-
- /* These must be initialized here because the docg4 is non-standard
- * and doesn't produce an id that the nand code can use to look up
- * these values (nand_scan_ident() not called).
- */
- mtd->size = DOCG4_CHIP_SIZE;
- mtd->name = "Msys_Diskonchip_G4";
- mtd->writesize = DOCG4_PAGE_SIZE;
- mtd->erasesize = DOCG4_BLOCK_SIZE;
- mtd->oobsize = DOCG4_OOB_SIZE;
-
- nand->IO_ADDR_R =
- (void __iomem *)CONFIG_SYS_NAND_BASE + DOC_IOSPACE_DATA;
- nand->IO_ADDR_W = nand->IO_ADDR_R;
- nand->chipsize = DOCG4_CHIP_SIZE;
- nand->chip_shift = DOCG4_CHIP_SHIFT;
- nand->bbt_erase_shift = DOCG4_ERASE_SHIFT;
- nand->phys_erase_shift = DOCG4_ERASE_SHIFT;
- nand->chip_delay = 20;
- nand->page_shift = DOCG4_PAGE_SHIFT;
- nand->pagemask = 0x3ffff;
- nand->badblockpos = NAND_LARGE_BADBLOCK_POS;
- nand->badblockbits = 8;
- nand->ecc.layout = &docg4_oobinfo;
- nand->ecc.mode = NAND_ECC_HW_SYNDROME;
- nand->ecc.size = DOCG4_PAGE_SIZE;
- nand->ecc.prepad = 8;
- nand->ecc.bytes = 8;
- nand->ecc.strength = DOCG4_T;
- nand->options = NAND_BUSWIDTH_16 | NAND_NO_SUBPAGE_WRITE;
- nand->controller = &nand->hwcontrol;
-
- /* methods */
- nand->cmdfunc = docg4_command;
- nand->waitfunc = docg4_wait;
- nand->select_chip = docg4_select_chip;
- nand->read_byte = docg4_read_byte;
- nand->block_markbad = docg4_block_markbad;
- nand->read_buf = docg4_read_buf;
- nand->write_buf = docg4_write_buf16;
- nand->scan_bbt = nand_default_bbt;
- nand->erase = docg4_erase_block;
- nand->ecc.read_page = docg4_read_page;
- nand->ecc.write_page = docg4_write_page;
- nand->ecc.read_page_raw = docg4_read_page_raw;
- nand->ecc.write_page_raw = docg4_write_page_raw;
- nand->ecc.read_oob = docg4_read_oob;
- nand->ecc.write_oob = docg4_write_oob;
-
- /*
- * The way the nand infrastructure code is written, a memory-based bbt
- * is not created if NAND_SKIP_BBTSCAN is set. With no memory bbt,
- * nand->block_bad() is used. So when ignoring bad blocks, we skip the
- * scan and define a dummy block_bad() which always returns 0.
- */
- if (ignore_badblocks) {
- nand->options |= NAND_SKIP_BBTSCAN;
- nand->block_bad = docg4_block_neverbad;
- }
-
- reset(CONFIG_SYS_NAND_BASE);
-
- /* check for presence of g4 chip by reading id registers */
- id1 = readw(CONFIG_SYS_NAND_BASE + DOC_CHIPID);
- id1 = readw(CONFIG_SYS_NAND_BASE + DOCG4_MYSTERY_REG);
- id2 = readw(CONFIG_SYS_NAND_BASE + DOC_CHIPID_INV);
- id2 = readw(CONFIG_SYS_NAND_BASE + DOCG4_MYSTERY_REG);
- if (id1 != DOCG4_IDREG1_VALUE || id2 != DOCG4_IDREG2_VALUE)
- return -1;
-
- /* initialize bch algorithm */
- docg4->bch = init_bch(DOCG4_M, DOCG4_T, DOCG4_PRIMITIVE_POLY);
- if (docg4->bch == NULL)
- return -1;
-
- retval = nand_scan_tail(mtd);
- if (retval)
- return -1;
-
- /*
- * Scan for bad blocks and create bbt here, then add the factory-marked
- * bad blocks to the bbt.
- */
- nand->scan_bbt(mtd);
- nand->options |= NAND_BBT_SCANNED;
- retval = read_factory_bbt(mtd);
- if (retval)
- return -1;
-
- retval = nand_register(devnum);
- if (retval)
- return -1;
-
- return 0;
-}
+++ /dev/null
-/*
- * SPL driver for Diskonchip G4 nand flash
- *
- * Copyright (C) 2013 Mike Dunn <mikedunn@newsguy.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- *
- * This driver basically mimics the load functionality of a typical IPL (initial
- * program loader) resident in the 2k NOR-like region of the docg4 that is
- * mapped to the reset vector. It allows the u-boot SPL to continue loading if
- * the IPL loads a fixed number of flash blocks that is insufficient to contain
- * the entire u-boot image. In this case, a concatenated spl + u-boot image is
- * written at the flash offset from which the IPL loads an image, and when the
- * IPL jumps to the SPL, the SPL resumes loading where the IPL left off. See
- * the palmtreo680 for an example.
- *
- * This driver assumes that the data was written to the flash using the device's
- * "reliable" mode, and also assumes that each 512 byte page is stored
- * redundantly in the subsequent page. This storage format is likely to be used
- * by all boards that boot from the docg4. The format compensates for the lack
- * of ecc in the IPL.
- *
- * Reliable mode reduces the capacity of a block by half, and the redundant
- * pages reduce it by half again. As a result, the normal 256k capacity of a
- * block is reduced to 64k for the purposes of the IPL/SPL.
- */
-
-#include <asm/io.h>
-#include <linux/mtd/docg4.h>
-
-/* forward declarations */
-static inline void write_nop(void __iomem *docptr);
-static int poll_status(void __iomem *docptr);
-static void write_addr(void __iomem *docptr, uint32_t docg4_addr);
-static void address_sequence(unsigned int g4_page, unsigned int g4_index,
- void __iomem *docptr);
-static int docg4_load_block_reliable(uint32_t flash_offset, void *dest_addr);
-
-int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
-{
- void *load_addr = dst;
- uint32_t flash_offset = offs;
- const unsigned int block_count =
- (size + DOCG4_BLOCK_CAPACITY_SPL - 1)
- / DOCG4_BLOCK_CAPACITY_SPL;
- int i;
-
- for (i = 0; i < block_count; i++) {
- int ret = docg4_load_block_reliable(flash_offset, load_addr);
- if (ret)
- return ret;
- load_addr += DOCG4_BLOCK_CAPACITY_SPL;
- flash_offset += DOCG4_BLOCK_SIZE;
- }
- return 0;
-}
-
-static inline void write_nop(void __iomem *docptr)
-{
- writew(0, docptr + DOC_NOP);
-}
-
-static int poll_status(void __iomem *docptr)
-{
- /*
- * Busy-wait for the FLASHREADY bit to be set in the FLASHCONTROL
- * register. Operations known to take a long time (e.g., block erase)
- * should sleep for a while before calling this.
- */
-
- uint8_t flash_status;
-
- /* hardware quirk requires reading twice initially */
- flash_status = readb(docptr + DOC_FLASHCONTROL);
-
- do {
- flash_status = readb(docptr + DOC_FLASHCONTROL);
- } while (!(flash_status & DOC_CTRL_FLASHREADY));
-
- return 0;
-}
-
-static void write_addr(void __iomem *docptr, uint32_t docg4_addr)
-{
- /* write the four address bytes packed in docg4_addr to the device */
-
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
- docg4_addr >>= 8;
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
- docg4_addr >>= 8;
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
- docg4_addr >>= 8;
- writeb(docg4_addr & 0xff, docptr + DOC_FLASHADDRESS);
-}
-
-static void address_sequence(unsigned int g4_page, unsigned int g4_index,
- void __iomem *docptr)
-{
- writew(DOCG4_SEQ_PAGE_READ, docptr + DOC_FLASHSEQUENCE);
- writew(DOCG4_CMD_PAGE_READ, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_addr(docptr, ((uint32_t)g4_page << 16) | g4_index);
- write_nop(docptr);
-}
-
-static int docg4_load_block_reliable(uint32_t flash_offset, void *dest_addr)
-{
- void __iomem *docptr = (void *)CONFIG_SYS_NAND_BASE;
- unsigned int g4_page = flash_offset >> 11; /* 2k page */
- const unsigned int last_g4_page = g4_page + 0x80; /* last in block */
- int g4_index = 0;
- uint16_t flash_status;
- uint16_t *buf;
-
- /* flash_offset must be aligned to the start of a block */
- if (flash_offset & 0x3ffff)
- return -1;
-
- writew(DOC_SEQ_RESET, docptr + DOC_FLASHSEQUENCE);
- writew(DOC_CMD_RESET, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
- poll_status(docptr);
- write_nop(docptr);
- writew(0x45, docptr + DOC_FLASHSEQUENCE);
- writew(0xa3, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- writew(0x22, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
-
- /* read 1st 4 oob bytes of first subpage of block */
- address_sequence(g4_page, 0x0100, docptr); /* index at oob */
- write_nop(docptr);
- flash_status = readw(docptr + DOC_FLASHCONTROL);
- flash_status = readw(docptr + DOC_FLASHCONTROL);
- if (flash_status & 0x06) /* sequence or protection errors */
- return -1;
- writew(DOCG4_CMD_READ2, docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
- poll_status(docptr);
- writew(DOC_ECCCONF0_READ_MODE | 4, docptr + DOC_ECCCONF0);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
-
- /*
- * Here we read the first four oob bytes of the first page of the block.
- * The IPL on the palmtreo680 requires that this contain a 32 bit magic
- * number, or the load aborts. We'll ignore it.
- */
- readw(docptr + 0x103c); /* hw quirk; 1st read discarded */
- readw(docptr + 0x103c); /* lower 16 bits of magic number */
- readw(docptr + DOCG4_MYSTERY_REG); /* upper 16 bits of magic number */
- writew(0, docptr + DOC_DATAEND);
- write_nop(docptr);
- write_nop(docptr);
-
- /* load contents of block to memory */
- buf = (uint16_t *)dest_addr;
- do {
- int i;
-
- address_sequence(g4_page, g4_index, docptr);
- writew(DOCG4_CMD_READ2,
- docptr + DOC_FLASHCOMMAND);
- write_nop(docptr);
- write_nop(docptr);
- poll_status(docptr);
- writew(DOC_ECCCONF0_READ_MODE |
- DOC_ECCCONF0_ECC_ENABLE |
- DOCG4_BCH_SIZE,
- docptr + DOC_ECCCONF0);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
- write_nop(docptr);
-
- /* read the 512 bytes of page data, 2 bytes at a time */
- readw(docptr + 0x103c); /* hw quirk */
- for (i = 0; i < 256; i++)
- *buf++ = readw(docptr + 0x103c);
-
- /* read oob, but discard it */
- for (i = 0; i < 7; i++)
- readw(docptr + 0x103c);
- readw(docptr + DOCG4_OOB_6_7);
- readw(docptr + DOCG4_OOB_6_7);
-
- writew(0, docptr + DOC_DATAEND);
- write_nop(docptr);
- write_nop(docptr);
-
- if (!(g4_index & 0x100)) {
- /* not redundant subpage read; check for ecc error */
- write_nop(docptr);
- flash_status = readw(docptr + DOC_ECCCONF1);
- flash_status = readw(docptr + DOC_ECCCONF1);
- if (flash_status & 0x80) { /* ecc error */
- g4_index += 0x108; /* read redundant subpage */
- buf -= 256; /* back up ram ptr */
- continue;
- } else /* no ecc error */
- g4_index += 0x210; /* skip redundant subpage */
- } else /* redundant page was just read; skip ecc error check */
- g4_index += 0x108;
-
- if (g4_index == 0x420) { /* finished with 2k page */
- g4_index = 0;
- g4_page += 2; /* odd-numbered 2k pages skipped */
- }
-
- } while (g4_page != last_g4_page); /* while still on same block */
-
- return 0;
-}
projects / u-boot / commitdiff