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/*
* Copyright (C) 2013 Mike Dunn <mikedunn@newsguy.com>
*
* This file is released under the terms of GPL v2 and any later version.
* See the file COPYING in the root directory of the source tree for details.
*
*/
#ifndef __DOCG4_H__
#define __DOCG4_H__
#include <common.h>
#include <linux/mtd/nand.h>
extern int docg4_nand_init(struct mtd_info *mtd,
struct nand_chip *nand, int devnum);
/* SPL-related definitions */
#define DOCG4_IPL_LOAD_BLOCK_COUNT 2 /* number of blocks that IPL loads */
#define DOCG4_BLOCK_CAPACITY_SPL 0x10000 /* reliable mode; redundant pages */
#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
/* 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 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 */
#endif /* __DOCG4_H__ */
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