diff options
Diffstat (limited to 'drivers/mtd/nand/raw/docg4.c')
| -rw-r--r-- | drivers/mtd/nand/raw/docg4.c | 1442 |
1 files changed, 0 insertions, 1442 deletions
diff --git a/drivers/mtd/nand/raw/docg4.c b/drivers/mtd/nand/raw/docg4.c deleted file mode 100644 index a3f04315c05c..000000000000 --- a/drivers/mtd/nand/raw/docg4.c +++ /dev/null @@ -1,1442 +0,0 @@ -/* - * Copyright © 2012 Mike Dunn <mikedunn@newsguy.com> - * - * mtd nand driver for M-Systems DiskOnChip G4 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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 <linux/kernel.h> -#include <linux/slab.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/sched.h> -#include <linux/delay.h> -#include <linux/module.h> -#include <linux/export.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/bitops.h> -#include <linux/mtd/partitions.h> -#include <linux/mtd/mtd.h> -#include <linux/mtd/rawnand.h> -#include <linux/bch.h> -#include <linux/bitrev.h> -#include <linux/jiffies.h> - -/* - * In "reliable mode" consecutive 2k pages are used in parallel (in some - * fashion) to store the same data. The data can be read back from the - * even-numbered pages in the normal manner; odd-numbered pages will appear to - * contain junk. Systems that boot from the docg4 typically write the secondary - * program loader (SPL) code in this mode. The SPL is loaded by the initial - * program loader (IPL, stored in the docg4's 2k NOR-like region that is mapped - * to the reset vector address). This module parameter enables you to use this - * driver to write the SPL. When in this mode, no more than 2k of data can be - * written at a time, because the addresses do not increment in the normal - * manner, and the starting offset must be within an even-numbered 2k region; - * i.e., invalid starting offsets are 0x800, 0xa00, 0xc00, 0xe00, 0x1800, - * 0x1a00, ... Reliable mode is a special case and should not be used unless - * you know what you're doing. - */ -static bool reliable_mode; -module_param(reliable_mode, bool, 0); -MODULE_PARM_DESC(reliable_mode, "pages are programmed in reliable mode"); - -/* - * You'll want to ignore badblocks if you're reading a partition that contains - * data written by the TrueFFS library (i.e., by PalmOS, Windows, etc), since - * it does not use mtd nand's method for marking bad blocks (using oob area). - * This will also skip the check of the "page written" flag. - */ -static bool ignore_badblocks; -module_param(ignore_badblocks, bool, 0); -MODULE_PARM_DESC(ignore_badblocks, "no badblock checking performed"); - -struct docg4_priv { - struct mtd_info *mtd; - struct device *dev; - void __iomem *virtadr; - 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; -}; - -/* - * Defines prefixed with DOCG4 are unique to the diskonchip G4. All others are - * shared with other diskonchip devices (P3, G3 at least). - * - * Functions with names prefixed with docg4_ are mtd / nand interface functions - * (though they may also be called internally). All others are internal. - */ - -#define DOC_IOSPACE_DATA 0x0800 - -/* register offsets */ -#define DOC_CHIPID 0x1000 -#define DOC_DEVICESELECT 0x100a -#define DOC_ASICMODE 0x100c -#define DOC_DATAEND 0x101e -#define DOC_NOP 0x103e - -#define DOC_FLASHSEQUENCE 0x1032 -#define DOC_FLASHCOMMAND 0x1034 -#define DOC_FLASHADDRESS 0x1036 -#define DOC_FLASHCONTROL 0x1038 -#define DOC_ECCCONF0 0x1040 -#define DOC_ECCCONF1 0x1042 -#define DOC_HAMMINGPARITY 0x1046 -#define DOC_BCH_SYNDROM(idx) (0x1048 + idx) - -#define DOC_ASICMODECONFIRM 0x1072 -#define DOC_CHIPID_INV 0x1074 -#define DOC_POWERMODE 0x107c - -#define DOCG4_MYSTERY_REG 0x1050 - -/* apparently used only to write oob bytes 6 and 7 */ -#define DOCG4_OOB_6_7 0x1052 - -/* DOC_FLASHSEQUENCE register commands */ -#define DOC_SEQ_RESET 0x00 -#define DOCG4_SEQ_PAGE_READ 0x03 -#define DOCG4_SEQ_FLUSH 0x29 -#define DOCG4_SEQ_PAGEWRITE 0x16 -#define DOCG4_SEQ_PAGEPROG 0x1e -#define DOCG4_SEQ_BLOCKERASE 0x24 -#define DOCG4_SEQ_SETMODE 0x45 - -/* DOC_FLASHCOMMAND register commands */ -#define DOCG4_CMD_PAGE_READ 0x00 -#define DOC_CMD_ERASECYCLE2 0xd0 -#define DOCG4_CMD_FLUSH 0x70 -#define DOCG4_CMD_READ2 0x30 -#define DOC_CMD_PROG_BLOCK_ADDR 0x60 -#define DOCG4_CMD_PAGEWRITE 0x80 -#define DOC_CMD_PROG_CYCLE2 0x10 -#define DOCG4_CMD_FAST_MODE 0xa3 /* functionality guessed */ -#define DOC_CMD_RELIABLE_MODE 0x22 -#define DOC_CMD_RESET 0xff - -/* DOC_POWERMODE register bits */ -#define DOC_POWERDOWN_READY 0x80 - -/* DOC_FLASHCONTROL register bits */ -#define DOC_CTRL_CE 0x10 -#define DOC_CTRL_UNKNOWN 0x40 -#define DOC_CTRL_FLASHREADY 0x01 - -/* DOC_ECCCONF0 register bits */ -#define DOC_ECCCONF0_READ_MODE 0x8000 -#define DOC_ECCCONF0_UNKNOWN 0x2000 -#define DOC_ECCCONF0_ECC_ENABLE 0x1000 -#define DOC_ECCCONF0_DATA_BYTES_MASK 0x07ff - -/* DOC_ECCCONF1 register bits */ -#define DOC_ECCCONF1_BCH_SYNDROM_ERR 0x80 -#define DOC_ECCCONF1_ECC_ENABLE 0x07 -#define DOC_ECCCONF1_PAGE_IS_WRITTEN 0x20 - -/* DOC_ASICMODE register bits */ -#define DOC_ASICMODE_RESET 0x00 -#define DOC_ASICMODE_NORMAL 0x01 -#define DOC_ASICMODE_POWERDOWN 0x02 -#define DOC_ASICMODE_MDWREN 0x04 -#define DOC_ASICMODE_BDETCT_RESET 0x08 -#define DOC_ASICMODE_RSTIN_RESET 0x10 -#define DOC_ASICMODE_RAM_WE 0x20 - -/* good status values read after read/write/erase operations */ -#define DOCG4_PROGSTATUS_GOOD 0x51 -#define DOCG4_PROGSTATUS_GOOD_2 0xe0 - -/* - * On read operations (page and oob-only), the first byte read from I/O reg is a - * status. On error, it reads 0x73; otherwise, it reads either 0x71 (first read - * after reset only) or 0x51, so bit 1 is presumed to be an error indicator. - */ -#define DOCG4_READ_ERROR 0x02 /* bit 1 indicates read error */ - -/* anatomy of the device */ -#define DOCG4_CHIP_SIZE 0x8000000 -#define DOCG4_PAGE_SIZE 0x200 -#define DOCG4_PAGES_PER_BLOCK 0x200 -#define DOCG4_BLOCK_SIZE (DOCG4_PAGES_PER_BLOCK * DOCG4_PAGE_SIZE) -#define DOCG4_NUMBLOCKS (DOCG4_CHIP_SIZE / DOCG4_BLOCK_SIZE) -#define DOCG4_OOB_SIZE 0x10 -#define DOCG4_CHIP_SHIFT 27 /* log_2(DOCG4_CHIP_SIZE) */ -#define DOCG4_PAGE_SHIFT 9 /* log_2(DOCG4_PAGE_SIZE) */ -#define DOCG4_ERASE_SHIFT 18 /* log_2(DOCG4_BLOCK_SIZE) */ - -/* all but the last byte is included in ecc calculation */ -#define DOCG4_BCH_SIZE (DOCG4_PAGE_SIZE + DOCG4_OOB_SIZE - 1) - -#define DOCG4_USERDATA_LEN 520 /* 512 byte page plus 8 oob avail to user */ - -/* expected values from the ID registers */ -#define DOCG4_IDREG1_VALUE 0x0400 -#define DOCG4_IDREG2_VALUE 0xfbff - -/* primitive polynomial used to build the Galois field used by hw ecc gen */ -#define DOCG4_PRIMITIVE_POLY 0x4443 - -#define DOCG4_M 14 /* Galois field is of order 2^14 */ -#define DOCG4_T 4 /* BCH alg corrects up to 4 bit errors */ - -#define DOCG4_FACTORY_BBT_PAGE 16 /* page where read-only factory bbt lives */ -#define DOCG4_REDUNDANT_BBT_PAGE 24 /* page where redundant factory bbt lives */ - -/* - * Bytes 0, 1 are used as badblock marker. - * Bytes 2 - 6 are available to the user. - * Byte 7 is hamming ecc for first 7 oob bytes only. - * Bytes 8 - 14 are hw-generated ecc covering entire page + oob bytes 0 - 14. - * Byte 15 (the last) is used by the driver as a "page written" flag. - */ -static int docg4_ooblayout_ecc(struct mtd_info *mtd, int section, - struct mtd_oob_region *oobregion) -{ - if (section) - return -ERANGE; - - oobregion->offset = 7; - oobregion->length = 9; - - return 0; -} - -static int docg4_ooblayout_free(struct mtd_info *mtd, int section, - struct mtd_oob_region *oobregion) -{ - if (section) - return -ERANGE; - - oobregion->offset = 2; - oobregion->length = 5; - - return 0; -} - -static const struct mtd_ooblayout_ops docg4_ooblayout_ops = { - .ecc = docg4_ooblayout_ecc, - .free = docg4_ooblayout_free, -}; - -/* - * 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 void docg4_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) -{ - int i; - struct nand_chip *nand = mtd_to_nand(mtd); - uint16_t *p = (uint16_t *) buf; - len >>= 1; - - for (i = 0; i < len; i++) - p[i] = readw(nand->IO_ADDR_R); -} - -static void docg4_write_buf16(struct mtd_info *mtd, const uint8_t *buf, int len) -{ - int i; - struct nand_chip *nand = mtd_to_nand(mtd); - uint16_t *p = (uint16_t *) buf; - len >>= 1; - - for (i = 0; i < len; i++) - writew(p[i], nand->IO_ADDR_W); -} - -static int poll_status(struct docg4_priv *doc) -{ - /* - * 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. - */ - - uint16_t flash_status; - unsigned long timeo; - void __iomem *docptr = doc->virtadr; - - dev_dbg(doc->dev, "%s...\n", __func__); - - /* hardware quirk requires reading twice initially */ - flash_status = readw(docptr + DOC_FLASHCONTROL); - - timeo = jiffies + msecs_to_jiffies(200); /* generous timeout */ - do { - cpu_relax(); - flash_status = readb(docptr + DOC_FLASHCONTROL); - } while (!(flash_status & DOC_CTRL_FLASHREADY) && - time_before(jiffies, timeo)); - - if (unlikely(!(flash_status & DOC_CTRL_FLASHREADY))) { - dev_err(doc->dev, "%s: timed out!\n", __func__); - return NAND_STATUS_FAIL; - } - - return 0; -} - - -static int docg4_wait(struct mtd_info *mtd, struct nand_chip *nand) -{ - - struct docg4_priv *doc = nand_get_controller_data(nand); - int status = NAND_STATUS_WP; /* inverse logic?? */ - dev_dbg(doc->dev, "%s...\n", __func__); - - /* report any previously unreported error */ - if (doc->status) { - status |= doc->status; - doc->status = 0; - return status; - } - - status |= poll_status(doc); - return status; -} - -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. - */ - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - - dev_dbg(doc->dev, "%s: chip %d\n", __func__, chip); - - if (chip < 0) - return; /* deselected */ - - if (chip > 0) - dev_warn(doc->dev, "multiple floors currently unsupported\n"); - - writew(0, docptr + DOC_DEVICESELECT); -} - -static void reset(struct mtd_info *mtd) -{ - /* full device reset */ - - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - - 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(doc); -} - -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_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - int i, numerrs, 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 == false) { - - /* - * 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 (nand->oob_poi[15]) { - int bit, numsetbits = 0; - unsigned long written_flag = nand->oob_poi[15]; - for_each_set_bit(bit, &written_flag, 8) - numsetbits++; - if (numsetbits > 4) { /* assume blank */ - dev_warn(doc->dev, - "error(s) 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) { - dev_warn(doc->dev, "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 *)nand->oob_poi); - - else /* error in page data */ - change_bit(errpos[i], (unsigned long *)buf); - } - - dev_notice(doc->dev, "%d error(s) corrected at offset %08x\n", - numerrs, page * DOCG4_PAGE_SIZE); - - return numerrs; -} - -static uint8_t docg4_read_byte(struct mtd_info *mtd) -{ - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - - dev_dbg(doc->dev, "%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; - } - - dev_warn(doc->dev, "unexpected call to read_byte()\n"); - - return 0; -} - -static void write_addr(struct docg4_priv *doc, uint32_t docg4_addr) -{ - /* write the four address bytes packed in docg4_addr to the device */ - - void __iomem *docptr = doc->virtadr; - 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 int read_progstatus(struct docg4_priv *doc) -{ - /* - * 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. - */ - void __iomem *docptr = doc->virtadr; - - /* 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); - - dev_dbg(doc->dev, "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; - dev_warn(doc->dev, "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_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - int retval = 0; - - dev_dbg(doc->dev, "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(doc); - - 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); - writew(0, docptr + DOC_DATAEND); - write_nop(docptr); - poll_status(doc); - write_nop(docptr); - - return retval; -} - -static void sequence_reset(struct mtd_info *mtd) -{ - /* common starting sequence for all operations */ - - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - - 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(doc); - write_nop(docptr); -} - -static void read_page_prologue(struct mtd_info *mtd, uint32_t docg4_addr) -{ - /* first step in reading a page */ - - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - - dev_dbg(doc->dev, - "docg4: %s: g4 page %08x\n", __func__, docg4_addr); - - sequence_reset(mtd); - - writew(DOCG4_SEQ_PAGE_READ, docptr + DOC_FLASHSEQUENCE); - writew(DOCG4_CMD_PAGE_READ, docptr + DOC_FLASHCOMMAND); - write_nop(docptr); - - write_addr(doc, docg4_addr); - - write_nop(docptr); - writew(DOCG4_CMD_READ2, docptr + DOC_FLASHCOMMAND); - write_nop(docptr); - write_nop(docptr); - - poll_status(doc); -} - -static void write_page_prologue(struct mtd_info *mtd, uint32_t docg4_addr) -{ - /* first step in writing a page */ - - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - - dev_dbg(doc->dev, - "docg4: %s: g4 addr: %x\n", __func__, docg4_addr); - sequence_reset(mtd); - - if (unlikely(reliable_mode)) { - writew(DOCG4_SEQ_SETMODE, docptr + DOC_FLASHSEQUENCE); - writew(DOCG4_CMD_FAST_MODE, docptr + DOC_FLASHCOMMAND); - writew(DOC_CMD_RELIABLE_MODE, docptr + DOC_FLASHCOMMAND); - write_nop(docptr); - } - - writew(DOCG4_SEQ_PAGEWRITE, docptr + DOC_FLASHSEQUENCE); - writew(DOCG4_CMD_PAGEWRITE, docptr + DOC_FLASHCOMMAND); - write_nop(docptr); - write_addr(doc, docg4_addr); - write_nop(docptr); - write_nop(docptr); - poll_status(doc); -} - -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_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - uint32_t g4_addr = mtd_to_docg4_address(page_addr, column); - - dev_dbg(doc->dev, "%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(mtd); - break; - - case NAND_CMD_READ0: - read_page_prologue(mtd, g4_addr); - break; - - case NAND_CMD_STATUS: - /* next call to read_byte() will expect a status */ - break; - - case NAND_CMD_SEQIN: - if (unlikely(reliable_mode)) { - uint16_t g4_page = g4_addr >> 16; - - /* writes to odd-numbered 2k pages are invalid */ - if (g4_page & 0x01) - dev_warn(doc->dev, - "invalid reliable mode address\n"); - } - - write_page_prologue(mtd, 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: - dev_warn(doc->dev, "docg4_command: " - "unexpected nand command 0x%x\n", command); - break; - - } -} - -static int read_page(struct mtd_info *mtd, struct nand_chip *nand, - uint8_t *buf, int page, bool use_ecc) -{ - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - uint16_t status, edc_err, *buf16; - int bits_corrected = 0; - - dev_dbg(doc->dev, "%s: page %08x\n", __func__, page); - - nand_read_page_op(nand, page, 0, NULL, 0); - - 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) { - dev_err(doc->dev, - "docg4_read_page: bad status: 0x%02x\n", status); - writew(0, docptr + DOC_DATAEND); - return -EIO; - } - - dev_dbg(doc->dev, "%s: status = 0x%x\n", __func__, status); - - docg4_read_buf(mtd, buf, DOCG4_PAGE_SIZE); /* read the page data */ - - /* this device always reads oob after 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); - - write_nop(docptr); - - if (likely(use_ecc == true)) { - - /* read the register that tells us if bitflip(s) detected */ - edc_err = readw(docptr + DOC_ECCCONF1); - edc_err = readw(docptr + DOC_ECCCONF1); - dev_dbg(doc->dev, "%s: edc_err = 0x%02x\n", __func__, edc_err); - - /* If bitflips are reported, attempt to correct with ecc */ - if (edc_err & DOC_ECCCONF1_BCH_SYNDROM_ERR) { - 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); - if (bits_corrected == -EBADMSG) /* uncorrectable errors */ - return 0; - return bits_corrected; -} - - -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, false); -} - -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, true); -} - -static int docg4_read_oob(struct mtd_info *mtd, struct nand_chip *nand, - int page) -{ - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - uint16_t status; - - dev_dbg(doc->dev, "%s: page %x\n", __func__, page); - - nand_read_page_op(nand, page, nand->ecc.size, NULL, 0); - - 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) { - dev_warn(doc->dev, - "docg4_read_oob failed: status = 0x%02x\n", status); - return -EIO; - } - - dev_dbg(doc->dev, "%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_erase_block(struct mtd_info *mtd, int page) -{ - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - uint16_t g4_page; - int status; - - dev_dbg(doc->dev, "%s: page %04x\n", __func__, page); - - sequence_reset(mtd); - - 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); - - usleep_range(500, 1000); /* erasure is long; take a snooze */ - poll_status(doc); - 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); - - writew(0, docptr + DOC_DATAEND); - write_nop(docptr); - poll_status(doc); - write_nop(docptr); - - status = nand->waitfunc(mtd, nand); - if (status < 0) - return status; - - return status & NAND_STATUS_FAIL ? -EIO : 0; -} - -static int write_page(struct mtd_info *mtd, struct nand_chip *nand, - const uint8_t *buf, int page, bool use_ecc) -{ - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - uint8_t ecc_buf[8]; - - dev_dbg(doc->dev, "%s...\n", __func__); - - nand_prog_page_begin_op(nand, page, 0, NULL, 0); - - 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 == true)) { - /* 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 nand_prog_page_end_op(nand); -} - -static int docg4_write_page_raw(struct mtd_info *mtd, struct nand_chip *nand, - const uint8_t *buf, int oob_required, int page) -{ - return write_page(mtd, nand, buf, page, false); -} - -static int docg4_write_page(struct mtd_info *mtd, struct nand_chip *nand, - const uint8_t *buf, int oob_required, int page) -{ - return write_page(mtd, nand, buf, page, true); -} - -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_get_controller_data(nand); - doc->oob_page = page; - memcpy(doc->oob_buf, nand->oob_poi, 16); - return 0; -} - -static int __init 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_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - uint32_t g4_addr = mtd_to_docg4_address(DOCG4_FACTORY_BBT_PAGE, 0); - uint8_t *buf; - int i, block; - __u32 eccfailed_stats = mtd->ecc_stats.failed; - - buf = kzalloc(DOCG4_PAGE_SIZE, GFP_KERNEL); - if (buf == NULL) - return -ENOMEM; - - read_page_prologue(mtd, g4_addr); - docg4_read_page(mtd, nand, buf, 0, DOCG4_FACTORY_BBT_PAGE); - - /* - * 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; - - if (mtd->ecc_stats.failed > eccfailed_stats) { - /* - * Whoops, an ecc failure ocurred reading the factory bbt. - * It is stored redundantly, so we get another chance. - */ - eccfailed_stats = mtd->ecc_stats.failed; - docg4_read_page(mtd, nand, buf, 0, DOCG4_REDUNDANT_BBT_PAGE); - if (mtd->ecc_stats.failed > eccfailed_stats) { - dev_warn(doc->dev, - "The factory bbt could not be read!\n"); - 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; - unsigned long bits = ~buf[i]; - for_each_set_bit(bitnum, &bits, 8) { - int badblock = block + 7 - bitnum; - nand->bbt[badblock / 4] |= - 0x03 << ((badblock % 4) * 2); - mtd->ecc_stats.badblocks++; - dev_notice(doc->dev, "factory-marked bad block: %d\n", - badblock); - } - } - exit: - kfree(buf); - return 0; -} - -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_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - struct nand_bbt_descr *bbtd = nand->badblock_pattern; - int page = (int)(ofs >> nand->page_shift); - uint32_t g4_addr = mtd_to_docg4_address(page, 0); - - dev_dbg(doc->dev, "%s: %08llx\n", __func__, ofs); - - if (unlikely(ofs & (DOCG4_BLOCK_SIZE - 1))) - dev_warn(doc->dev, "%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; - - /* 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(mtd, g4_addr); - docg4_write_page(mtd, nand, buf, 1, page); - ret = pageprog(mtd); - - kfree(buf); - - return ret; -} - -static int docg4_block_neverbad(struct mtd_info *mtd, loff_t ofs) -{ - /* only called when module_param ignore_badblocks is set */ - return 0; -} - -static int docg4_suspend(struct platform_device *pdev, pm_message_t state) -{ - /* - * Put the device into "deep power-down" mode. Note that CE# must be - * deasserted for this to take effect. The xscale, e.g., can be - * configured to float this signal when the processor enters power-down, - * and a suitable pull-up ensures its deassertion. - */ - - int i; - uint8_t pwr_down; - struct docg4_priv *doc = platform_get_drvdata(pdev); - void __iomem *docptr = doc->virtadr; - - dev_dbg(doc->dev, "%s...\n", __func__); - - /* poll the register that tells us we're ready to go to sleep */ - for (i = 0; i < 10; i++) { - pwr_down = readb(docptr + DOC_POWERMODE); - if (pwr_down & DOC_POWERDOWN_READY) - break; - usleep_range(1000, 4000); - } - - if (pwr_down & DOC_POWERDOWN_READY) { - dev_err(doc->dev, "suspend failed; " - "timeout polling DOC_POWERDOWN_READY\n"); - return -EIO; - } - - writew(DOC_ASICMODE_POWERDOWN | DOC_ASICMODE_MDWREN, - docptr + DOC_ASICMODE); - writew(~(DOC_ASICMODE_POWERDOWN | DOC_ASICMODE_MDWREN), - docptr + DOC_ASICMODECONFIRM); - - write_nop(docptr); - - return 0; -} - -static int docg4_resume(struct platform_device *pdev) -{ - - /* - * Exit power-down. Twelve consecutive reads of the address below - * accomplishes this, assuming CE# has been asserted. - */ - - struct docg4_priv *doc = platform_get_drvdata(pdev); - void __iomem *docptr = doc->virtadr; - int i; - - dev_dbg(doc->dev, "%s...\n", __func__); - - for (i = 0; i < 12; i++) - readb(docptr + 0x1fff); - - return 0; -} - -static void __init init_mtd_structs(struct mtd_info *mtd) -{ - /* initialize mtd and nand data structures */ - - /* - * Note that some of the following initializations are not usually - * required within a nand driver because they are performed by the nand - * infrastructure code as part of nand_scan(). In this case they need - * to be initialized here because we skip call to nand_scan_ident() (the - * first half of nand_scan()). The call to nand_scan_ident() could be - * skipped because for this device the chip id is not read in the manner - * of a standard nand device. - */ - - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - - 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; - mtd_set_ooblayout(mtd, &docg4_ooblayout_ops); - nand->chipsize = DOCG4_CHIP_SIZE; - nand->chip_shift = DOCG4_CHIP_SHIFT; - nand->bbt_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.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->IO_ADDR_R = nand->IO_ADDR_W = doc->virtadr + DOC_IOSPACE_DATA; - nand->controller = &nand->dummy_controller; - nand_controller_init(nand->controller); - - /* 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->erase = docg4_erase_block; - nand->set_features = nand_get_set_features_notsupp; - nand->get_features = nand_get_set_features_notsupp; - 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; - } - -} - -static int __init read_id_reg(struct mtd_info *mtd) -{ - struct nand_chip *nand = mtd_to_nand(mtd); - struct docg4_priv *doc = nand_get_controller_data(nand); - void __iomem *docptr = doc->virtadr; - uint16_t id1, id2; - - /* check for presence of g4 chip by reading id registers */ - id1 = readw(docptr + DOC_CHIPID); - id1 = readw(docptr + DOCG4_MYSTERY_REG); - id2 = readw(docptr + DOC_CHIPID_INV); - id2 = readw(docptr + DOCG4_MYSTERY_REG); - - if (id1 == DOCG4_IDREG1_VALUE && id2 == DOCG4_IDREG2_VALUE) { - dev_info(doc->dev, - "NAND device: 128MiB Diskonchip G4 detected\n"); - return 0; - } - - return -ENODEV; -} - -static char const *part_probes[] = { "cmdlinepart", "saftlpart", NULL }; - -static int docg4_attach_chip(struct nand_chip *chip) -{ - struct mtd_info *mtd = nand_to_mtd(chip); - struct docg4_priv *doc = (struct docg4_priv *)(chip + 1); - int ret; - - init_mtd_structs(mtd); - - /* Initialize kernel BCH algorithm */ - doc->bch = init_bch(DOCG4_M, DOCG4_T, DOCG4_PRIMITIVE_POLY); - if (!doc->bch) - return -EINVAL; - - reset(mtd); - - ret = read_id_reg(mtd); - if (ret) - free_bch(doc->bch); - - return ret; -} - -static void docg4_detach_chip(struct nand_chip *chip) -{ - struct docg4_priv *doc = (struct docg4_priv *)(chip + 1); - - free_bch(doc->bch); -} - -static const struct nand_controller_ops docg4_controller_ops = { - .attach_chip = docg4_attach_chip, - .detach_chip = docg4_detach_chip, -}; - -static int __init probe_docg4(struct platform_device *pdev) -{ - struct mtd_info *mtd; - struct nand_chip *nand; - void __iomem *virtadr; - struct docg4_priv *doc; - int len, retval; - struct resource *r; - struct device *dev = &pdev->dev; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (r == NULL) { - dev_err(dev, "no io memory resource defined!\n"); - return -ENODEV; - } - - virtadr = ioremap(r->start, resource_size(r)); - if (!virtadr) { - dev_err(dev, "Diskonchip ioremap failed: %pR\n", r); - return -EIO; - } - - len = sizeof(struct nand_chip) + sizeof(struct docg4_priv); - nand = kzalloc(len, GFP_KERNEL); - if (nand == NULL) { - retval = -ENOMEM; - goto unmap; - } - - mtd = nand_to_mtd(nand); - doc = (struct docg4_priv *) (nand + 1); - nand_set_controller_data(nand, doc); - mtd->dev.parent = &pdev->dev; - doc->virtadr = virtadr; - doc->dev = dev; - platform_set_drvdata(pdev, doc); - - /* - * Running nand_scan() with maxchips == 0 will skip nand_scan_ident(), - * which is a specific operation with this driver and done in the - * ->attach_chip callback. - */ - nand->dummy_controller.ops = &docg4_controller_ops; - retval = nand_scan(mtd, 0); - if (retval) - goto free_nand; - - retval = read_factory_bbt(mtd); - if (retval) - goto cleanup_nand; - - retval = mtd_device_parse_register(mtd, part_probes, NULL, NULL, 0); - if (retval) - goto cleanup_nand; - - doc->mtd = mtd; - - return 0; - -cleanup_nand: - nand_cleanup(nand); -free_nand: - kfree(nand); -unmap: - iounmap(virtadr); - - return retval; -} - -static int __exit cleanup_docg4(struct platform_device *pdev) -{ - struct docg4_priv *doc = platform_get_drvdata(pdev); - nand_release(doc->mtd); - kfree(mtd_to_nand(doc->mtd)); - iounmap(doc->virtadr); - return 0; -} - -static struct platform_driver docg4_driver = { - .driver = { - .name = "docg4", - }, - .suspend = docg4_suspend, - .resume = docg4_resume, - .remove = __exit_p(cleanup_docg4), -}; - -module_platform_driver_probe(docg4_driver, probe_docg4); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Mike Dunn"); -MODULE_DESCRIPTION("M-Systems DiskOnChip G4 device driver"); |