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authorMike Dunn <mikedunn@newsguy.com>2013-04-12 11:59:18 -0700
committerMarek Vasut <marex@denx.de>2013-05-05 23:47:05 +0200
commit956b03e180b5d0a780a9f48707beb264a5e57426 (patch)
tree5a08bebe0557c395fa9f65d7b640d98848722a9b /include
parente0e89e236f9692eb0af034c59607e2db2e333c1d (diff)
mtd: nand: add driver for diskonchip g4 nand flash
This patch adds a driver for the diskonchip G4 nand flash device. It is based on the driver from the linux kernel. This also includes a separate SPL driver. A separate SPL driver is used because the device operates in a different mode (reliable mode) when loading a boot image, and also because the storage format of the boot image is different from normal data (pages are stored redundantly). The SPL driver basically mimics how a typical IPL reads data from the device. The special operating mode and storage format are used to compensate for the fact that the IPL does not contain the BCH ecc decoding algorithm (due to size constraints). Although the u-boot SPL *could* use ecc, it operates like an IPL for the sake of simplicity and uniformity, since the IPL and SPL share the task of loading the u-boot image. As a side benefit, the SPL driver is very small. [port from linux kernel 3.4 commit 570469f3bde7f71cc1ece07a18d54a05b6a8775d] Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mtd/docg4.h134
1 files changed, 134 insertions, 0 deletions
diff --git a/include/linux/mtd/docg4.h b/include/linux/mtd/docg4.h
new file mode 100644
index 0000000000..982f5ad133
--- /dev/null
+++ b/include/linux/mtd/docg4.h
@@ -0,0 +1,134 @@
+/*
+ * 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__ */