2152 строки
58 KiB
C
2152 строки
58 KiB
C
/*
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* Handles the M-Systems DiskOnChip G3 chip
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*
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* Copyright (C) 2011 Robert Jarzmik
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/platform_device.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/bitmap.h>
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#include <linux/bitrev.h>
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#include <linux/bch.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#define CREATE_TRACE_POINTS
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#include "docg3.h"
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/*
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* This driver handles the DiskOnChip G3 flash memory.
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*
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* As no specification is available from M-Systems/Sandisk, this drivers lacks
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* several functions available on the chip, as :
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* - IPL write
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*
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* The bus data width (8bits versus 16bits) is not handled (if_cfg flag), and
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* the driver assumes a 16bits data bus.
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*
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* DocG3 relies on 2 ECC algorithms, which are handled in hardware :
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* - a 1 byte Hamming code stored in the OOB for each page
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* - a 7 bytes BCH code stored in the OOB for each page
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* The BCH ECC is :
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* - BCH is in GF(2^14)
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* - BCH is over data of 520 bytes (512 page + 7 page_info bytes
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* + 1 hamming byte)
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* - BCH can correct up to 4 bits (t = 4)
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* - BCH syndroms are calculated in hardware, and checked in hardware as well
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*
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*/
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static unsigned int reliable_mode;
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module_param(reliable_mode, uint, 0);
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MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
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"2=reliable) : MLC normal operations are in normal mode");
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/**
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* struct docg3_oobinfo - DiskOnChip G3 OOB layout
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* @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
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* @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
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* @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
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* @oobavail: 8 available bytes remaining after ECC toll
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*/
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static struct nand_ecclayout docg3_oobinfo = {
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.eccbytes = 8,
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.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
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.oobfree = {{0, 7}, {15, 1} },
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.oobavail = 8,
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};
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static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
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{
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u8 val = readb(docg3->cascade->base + reg);
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trace_docg3_io(0, 8, reg, (int)val);
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return val;
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}
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static inline u16 doc_readw(struct docg3 *docg3, u16 reg)
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{
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u16 val = readw(docg3->cascade->base + reg);
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trace_docg3_io(0, 16, reg, (int)val);
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return val;
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}
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static inline void doc_writeb(struct docg3 *docg3, u8 val, u16 reg)
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{
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writeb(val, docg3->cascade->base + reg);
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trace_docg3_io(1, 8, reg, val);
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}
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static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg)
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{
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writew(val, docg3->cascade->base + reg);
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trace_docg3_io(1, 16, reg, val);
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}
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static inline void doc_flash_command(struct docg3 *docg3, u8 cmd)
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{
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doc_writeb(docg3, cmd, DOC_FLASHCOMMAND);
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}
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static inline void doc_flash_sequence(struct docg3 *docg3, u8 seq)
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{
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doc_writeb(docg3, seq, DOC_FLASHSEQUENCE);
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}
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static inline void doc_flash_address(struct docg3 *docg3, u8 addr)
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{
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doc_writeb(docg3, addr, DOC_FLASHADDRESS);
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}
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static char const * const part_probes[] = { "cmdlinepart", "saftlpart", NULL };
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static int doc_register_readb(struct docg3 *docg3, int reg)
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{
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u8 val;
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doc_writew(docg3, reg, DOC_READADDRESS);
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val = doc_readb(docg3, reg);
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doc_vdbg("Read register %04x : %02x\n", reg, val);
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return val;
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}
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static int doc_register_readw(struct docg3 *docg3, int reg)
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{
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u16 val;
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doc_writew(docg3, reg, DOC_READADDRESS);
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val = doc_readw(docg3, reg);
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doc_vdbg("Read register %04x : %04x\n", reg, val);
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return val;
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}
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/**
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* doc_delay - delay docg3 operations
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* @docg3: the device
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* @nbNOPs: the number of NOPs to issue
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*
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* As no specification is available, the right timings between chip commands are
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* unknown. The only available piece of information are the observed nops on a
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* working docg3 chip.
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* Therefore, doc_delay relies on a busy loop of NOPs, instead of scheduler
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* friendlier msleep() functions or blocking mdelay().
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*/
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static void doc_delay(struct docg3 *docg3, int nbNOPs)
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{
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int i;
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doc_vdbg("NOP x %d\n", nbNOPs);
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for (i = 0; i < nbNOPs; i++)
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doc_writeb(docg3, 0, DOC_NOP);
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}
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static int is_prot_seq_error(struct docg3 *docg3)
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{
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int ctrl;
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ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
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return ctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR);
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}
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static int doc_is_ready(struct docg3 *docg3)
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{
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int ctrl;
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ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
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return ctrl & DOC_CTRL_FLASHREADY;
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}
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static int doc_wait_ready(struct docg3 *docg3)
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{
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int maxWaitCycles = 100;
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do {
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doc_delay(docg3, 4);
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cpu_relax();
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} while (!doc_is_ready(docg3) && maxWaitCycles--);
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doc_delay(docg3, 2);
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if (maxWaitCycles > 0)
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return 0;
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else
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return -EIO;
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}
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static int doc_reset_seq(struct docg3 *docg3)
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{
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int ret;
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doc_writeb(docg3, 0x10, DOC_FLASHCONTROL);
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doc_flash_sequence(docg3, DOC_SEQ_RESET);
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doc_flash_command(docg3, DOC_CMD_RESET);
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doc_delay(docg3, 2);
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ret = doc_wait_ready(docg3);
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doc_dbg("doc_reset_seq() -> isReady=%s\n", ret ? "false" : "true");
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return ret;
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}
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/**
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* doc_read_data_area - Read data from data area
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* @docg3: the device
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* @buf: the buffer to fill in (might be NULL is dummy reads)
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* @len: the length to read
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* @first: first time read, DOC_READADDRESS should be set
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*
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* Reads bytes from flash data. Handles the single byte / even bytes reads.
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*/
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static void doc_read_data_area(struct docg3 *docg3, void *buf, int len,
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int first)
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{
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int i, cdr, len4;
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u16 data16, *dst16;
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u8 data8, *dst8;
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doc_dbg("doc_read_data_area(buf=%p, len=%d)\n", buf, len);
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cdr = len & 0x1;
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len4 = len - cdr;
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if (first)
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doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS);
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dst16 = buf;
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for (i = 0; i < len4; i += 2) {
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data16 = doc_readw(docg3, DOC_IOSPACE_DATA);
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if (dst16) {
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*dst16 = data16;
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dst16++;
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}
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}
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if (cdr) {
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doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE,
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DOC_READADDRESS);
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doc_delay(docg3, 1);
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dst8 = (u8 *)dst16;
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for (i = 0; i < cdr; i++) {
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data8 = doc_readb(docg3, DOC_IOSPACE_DATA);
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if (dst8) {
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*dst8 = data8;
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dst8++;
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}
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}
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}
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}
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/**
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* doc_write_data_area - Write data into data area
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* @docg3: the device
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* @buf: the buffer to get input bytes from
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* @len: the length to write
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*
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* Writes bytes into flash data. Handles the single byte / even bytes writes.
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*/
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static void doc_write_data_area(struct docg3 *docg3, const void *buf, int len)
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{
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int i, cdr, len4;
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u16 *src16;
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u8 *src8;
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doc_dbg("doc_write_data_area(buf=%p, len=%d)\n", buf, len);
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cdr = len & 0x3;
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len4 = len - cdr;
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doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS);
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src16 = (u16 *)buf;
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for (i = 0; i < len4; i += 2) {
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doc_writew(docg3, *src16, DOC_IOSPACE_DATA);
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src16++;
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}
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src8 = (u8 *)src16;
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for (i = 0; i < cdr; i++) {
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doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE,
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DOC_READADDRESS);
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doc_writeb(docg3, *src8, DOC_IOSPACE_DATA);
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src8++;
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}
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}
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/**
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* doc_set_data_mode - Sets the flash to normal or reliable data mode
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* @docg3: the device
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*
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* The reliable data mode is a bit slower than the fast mode, but less errors
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* occur. Entering the reliable mode cannot be done without entering the fast
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* mode first.
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*
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* In reliable mode, pages 2*n and 2*n+1 are clones. Writing to page 0 of blocks
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* (4,5) make the hardware write also to page 1 of blocks blocks(4,5). Reading
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* from page 0 of blocks (4,5) or from page 1 of blocks (4,5) gives the same
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* result, which is a logical and between bytes from page 0 and page 1 (which is
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* consistent with the fact that writing to a page is _clearing_ bits of that
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* page).
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*/
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static void doc_set_reliable_mode(struct docg3 *docg3)
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{
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static char *strmode[] = { "normal", "fast", "reliable", "invalid" };
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doc_dbg("doc_set_reliable_mode(%s)\n", strmode[docg3->reliable]);
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switch (docg3->reliable) {
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case 0:
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break;
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case 1:
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doc_flash_sequence(docg3, DOC_SEQ_SET_FASTMODE);
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doc_flash_command(docg3, DOC_CMD_FAST_MODE);
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break;
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case 2:
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doc_flash_sequence(docg3, DOC_SEQ_SET_RELIABLEMODE);
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doc_flash_command(docg3, DOC_CMD_FAST_MODE);
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doc_flash_command(docg3, DOC_CMD_RELIABLE_MODE);
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break;
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default:
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doc_err("doc_set_reliable_mode(): invalid mode\n");
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break;
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}
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doc_delay(docg3, 2);
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}
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/**
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* doc_set_asic_mode - Set the ASIC mode
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* @docg3: the device
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* @mode: the mode
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*
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* The ASIC can work in 3 modes :
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* - RESET: all registers are zeroed
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* - NORMAL: receives and handles commands
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* - POWERDOWN: minimal poweruse, flash parts shut off
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*/
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static void doc_set_asic_mode(struct docg3 *docg3, u8 mode)
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{
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int i;
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for (i = 0; i < 12; i++)
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doc_readb(docg3, DOC_IOSPACE_IPL);
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mode |= DOC_ASICMODE_MDWREN;
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doc_dbg("doc_set_asic_mode(%02x)\n", mode);
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doc_writeb(docg3, mode, DOC_ASICMODE);
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doc_writeb(docg3, ~mode, DOC_ASICMODECONFIRM);
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doc_delay(docg3, 1);
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}
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/**
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* doc_set_device_id - Sets the devices id for cascaded G3 chips
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* @docg3: the device
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* @id: the chip to select (amongst 0, 1, 2, 3)
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*
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* There can be 4 cascaded G3 chips. This function selects the one which will
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* should be the active one.
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*/
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static void doc_set_device_id(struct docg3 *docg3, int id)
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{
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u8 ctrl;
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doc_dbg("doc_set_device_id(%d)\n", id);
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doc_writeb(docg3, id, DOC_DEVICESELECT);
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ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
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ctrl &= ~DOC_CTRL_VIOLATION;
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ctrl |= DOC_CTRL_CE;
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doc_writeb(docg3, ctrl, DOC_FLASHCONTROL);
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}
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/**
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* doc_set_extra_page_mode - Change flash page layout
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* @docg3: the device
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*
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* Normally, the flash page is split into the data (512 bytes) and the out of
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* band data (16 bytes). For each, 4 more bytes can be accessed, where the wear
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* leveling counters are stored. To access this last area of 4 bytes, a special
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* mode must be input to the flash ASIC.
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*
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* Returns 0 if no error occurred, -EIO else.
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*/
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static int doc_set_extra_page_mode(struct docg3 *docg3)
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{
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int fctrl;
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doc_dbg("doc_set_extra_page_mode()\n");
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doc_flash_sequence(docg3, DOC_SEQ_PAGE_SIZE_532);
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doc_flash_command(docg3, DOC_CMD_PAGE_SIZE_532);
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doc_delay(docg3, 2);
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fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
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if (fctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR))
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return -EIO;
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else
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return 0;
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}
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/**
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* doc_setup_addr_sector - Setup blocks/page/ofs address for one plane
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* @docg3: the device
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* @sector: the sector
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*/
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static void doc_setup_addr_sector(struct docg3 *docg3, int sector)
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{
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doc_delay(docg3, 1);
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doc_flash_address(docg3, sector & 0xff);
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doc_flash_address(docg3, (sector >> 8) & 0xff);
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doc_flash_address(docg3, (sector >> 16) & 0xff);
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doc_delay(docg3, 1);
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}
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/**
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* doc_setup_writeaddr_sector - Setup blocks/page/ofs address for one plane
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* @docg3: the device
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* @sector: the sector
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* @ofs: the offset in the page, between 0 and (512 + 16 + 512)
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*/
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static void doc_setup_writeaddr_sector(struct docg3 *docg3, int sector, int ofs)
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{
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ofs = ofs >> 2;
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doc_delay(docg3, 1);
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doc_flash_address(docg3, ofs & 0xff);
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doc_flash_address(docg3, sector & 0xff);
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doc_flash_address(docg3, (sector >> 8) & 0xff);
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doc_flash_address(docg3, (sector >> 16) & 0xff);
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doc_delay(docg3, 1);
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}
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/**
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* doc_seek - Set both flash planes to the specified block, page for reading
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* @docg3: the device
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* @block0: the first plane block index
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* @block1: the second plane block index
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* @page: the page index within the block
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* @wear: if true, read will occur on the 4 extra bytes of the wear area
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* @ofs: offset in page to read
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*
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* Programs the flash even and odd planes to the specific block and page.
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* Alternatively, programs the flash to the wear area of the specified page.
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*/
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static int doc_read_seek(struct docg3 *docg3, int block0, int block1, int page,
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int wear, int ofs)
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{
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int sector, ret = 0;
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doc_dbg("doc_seek(blocks=(%d,%d), page=%d, ofs=%d, wear=%d)\n",
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block0, block1, page, ofs, wear);
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if (!wear && (ofs < 2 * DOC_LAYOUT_PAGE_SIZE)) {
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doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1);
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doc_flash_command(docg3, DOC_CMD_READ_PLANE1);
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doc_delay(docg3, 2);
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} else {
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doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2);
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doc_flash_command(docg3, DOC_CMD_READ_PLANE2);
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doc_delay(docg3, 2);
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}
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doc_set_reliable_mode(docg3);
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if (wear)
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ret = doc_set_extra_page_mode(docg3);
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if (ret)
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goto out;
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doc_flash_sequence(docg3, DOC_SEQ_READ);
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sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
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doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
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doc_setup_addr_sector(docg3, sector);
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sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
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doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
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doc_setup_addr_sector(docg3, sector);
|
|
doc_delay(docg3, 1);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* doc_write_seek - Set both flash planes to the specified block, page for writing
|
|
* @docg3: the device
|
|
* @block0: the first plane block index
|
|
* @block1: the second plane block index
|
|
* @page: the page index within the block
|
|
* @ofs: offset in page to write
|
|
*
|
|
* Programs the flash even and odd planes to the specific block and page.
|
|
* Alternatively, programs the flash to the wear area of the specified page.
|
|
*/
|
|
static int doc_write_seek(struct docg3 *docg3, int block0, int block1, int page,
|
|
int ofs)
|
|
{
|
|
int ret = 0, sector;
|
|
|
|
doc_dbg("doc_write_seek(blocks=(%d,%d), page=%d, ofs=%d)\n",
|
|
block0, block1, page, ofs);
|
|
|
|
doc_set_reliable_mode(docg3);
|
|
|
|
if (ofs < 2 * DOC_LAYOUT_PAGE_SIZE) {
|
|
doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1);
|
|
doc_flash_command(docg3, DOC_CMD_READ_PLANE1);
|
|
doc_delay(docg3, 2);
|
|
} else {
|
|
doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2);
|
|
doc_flash_command(docg3, DOC_CMD_READ_PLANE2);
|
|
doc_delay(docg3, 2);
|
|
}
|
|
|
|
doc_flash_sequence(docg3, DOC_SEQ_PAGE_SETUP);
|
|
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1);
|
|
|
|
sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
|
|
doc_setup_writeaddr_sector(docg3, sector, ofs);
|
|
|
|
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE3);
|
|
doc_delay(docg3, 2);
|
|
ret = doc_wait_ready(docg3);
|
|
if (ret)
|
|
goto out;
|
|
|
|
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1);
|
|
sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
|
|
doc_setup_writeaddr_sector(docg3, sector, ofs);
|
|
doc_delay(docg3, 1);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* doc_read_page_ecc_init - Initialize hardware ECC engine
|
|
* @docg3: the device
|
|
* @len: the number of bytes covered by the ECC (BCH covered)
|
|
*
|
|
* The function does initialize the hardware ECC engine to compute the Hamming
|
|
* ECC (on 1 byte) and the BCH hardware ECC (on 7 bytes).
|
|
*
|
|
* Return 0 if succeeded, -EIO on error
|
|
*/
|
|
static int doc_read_page_ecc_init(struct docg3 *docg3, int len)
|
|
{
|
|
doc_writew(docg3, DOC_ECCCONF0_READ_MODE
|
|
| DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE
|
|
| (len & DOC_ECCCONF0_DATA_BYTES_MASK),
|
|
DOC_ECCCONF0);
|
|
doc_delay(docg3, 4);
|
|
doc_register_readb(docg3, DOC_FLASHCONTROL);
|
|
return doc_wait_ready(docg3);
|
|
}
|
|
|
|
/**
|
|
* doc_write_page_ecc_init - Initialize hardware BCH ECC engine
|
|
* @docg3: the device
|
|
* @len: the number of bytes covered by the ECC (BCH covered)
|
|
*
|
|
* The function does initialize the hardware ECC engine to compute the Hamming
|
|
* ECC (on 1 byte) and the BCH hardware ECC (on 7 bytes).
|
|
*
|
|
* Return 0 if succeeded, -EIO on error
|
|
*/
|
|
static int doc_write_page_ecc_init(struct docg3 *docg3, int len)
|
|
{
|
|
doc_writew(docg3, DOC_ECCCONF0_WRITE_MODE
|
|
| DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE
|
|
| (len & DOC_ECCCONF0_DATA_BYTES_MASK),
|
|
DOC_ECCCONF0);
|
|
doc_delay(docg3, 4);
|
|
doc_register_readb(docg3, DOC_FLASHCONTROL);
|
|
return doc_wait_ready(docg3);
|
|
}
|
|
|
|
/**
|
|
* doc_ecc_disable - Disable Hamming and BCH ECC hardware calculator
|
|
* @docg3: the device
|
|
*
|
|
* Disables the hardware ECC generator and checker, for unchecked reads (as when
|
|
* reading OOB only or write status byte).
|
|
*/
|
|
static void doc_ecc_disable(struct docg3 *docg3)
|
|
{
|
|
doc_writew(docg3, DOC_ECCCONF0_READ_MODE, DOC_ECCCONF0);
|
|
doc_delay(docg3, 4);
|
|
}
|
|
|
|
/**
|
|
* doc_hamming_ecc_init - Initialize hardware Hamming ECC engine
|
|
* @docg3: the device
|
|
* @nb_bytes: the number of bytes covered by the ECC (Hamming covered)
|
|
*
|
|
* This function programs the ECC hardware to compute the hamming code on the
|
|
* last provided N bytes to the hardware generator.
|
|
*/
|
|
static void doc_hamming_ecc_init(struct docg3 *docg3, int nb_bytes)
|
|
{
|
|
u8 ecc_conf1;
|
|
|
|
ecc_conf1 = doc_register_readb(docg3, DOC_ECCCONF1);
|
|
ecc_conf1 &= ~DOC_ECCCONF1_HAMMING_BITS_MASK;
|
|
ecc_conf1 |= (nb_bytes & DOC_ECCCONF1_HAMMING_BITS_MASK);
|
|
doc_writeb(docg3, ecc_conf1, DOC_ECCCONF1);
|
|
}
|
|
|
|
/**
|
|
* doc_ecc_bch_fix_data - Fix if need be read data from flash
|
|
* @docg3: the device
|
|
* @buf: the buffer of read data (512 + 7 + 1 bytes)
|
|
* @hwecc: the hardware calculated ECC.
|
|
* It's in fact recv_ecc ^ calc_ecc, where recv_ecc was read from OOB
|
|
* area data, and calc_ecc the ECC calculated by the hardware generator.
|
|
*
|
|
* Checks if the received data matches the ECC, and if an error is detected,
|
|
* tries to fix the bit flips (at most 4) in the buffer buf. As the docg3
|
|
* understands the (data, ecc, syndroms) in an inverted order in comparison to
|
|
* the BCH library, the function reverses the order of bits (ie. bit7 and bit0,
|
|
* bit6 and bit 1, ...) for all ECC data.
|
|
*
|
|
* 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.
|
|
*
|
|
* Returns number of fixed bits (0, 1, 2, 3, 4) or -EBADMSG if too many bit
|
|
* errors were detected and cannot be fixed.
|
|
*/
|
|
static int doc_ecc_bch_fix_data(struct docg3 *docg3, void *buf, u8 *hwecc)
|
|
{
|
|
u8 ecc[DOC_ECC_BCH_SIZE];
|
|
int errorpos[DOC_ECC_BCH_T], i, numerrs;
|
|
|
|
for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
|
|
ecc[i] = bitrev8(hwecc[i]);
|
|
numerrs = decode_bch(docg3->cascade->bch, NULL,
|
|
DOC_ECC_BCH_COVERED_BYTES,
|
|
NULL, ecc, NULL, errorpos);
|
|
BUG_ON(numerrs == -EINVAL);
|
|
if (numerrs < 0)
|
|
goto out;
|
|
|
|
for (i = 0; i < numerrs; i++)
|
|
errorpos[i] = (errorpos[i] & ~7) | (7 - (errorpos[i] & 7));
|
|
for (i = 0; i < numerrs; i++)
|
|
if (errorpos[i] < DOC_ECC_BCH_COVERED_BYTES*8)
|
|
/* error is located in data, correct it */
|
|
change_bit(errorpos[i], buf);
|
|
out:
|
|
doc_dbg("doc_ecc_bch_fix_data: flipped %d bits\n", numerrs);
|
|
return numerrs;
|
|
}
|
|
|
|
|
|
/**
|
|
* doc_read_page_prepare - Prepares reading data from a flash page
|
|
* @docg3: the device
|
|
* @block0: the first plane block index on flash memory
|
|
* @block1: the second plane block index on flash memory
|
|
* @page: the page index in the block
|
|
* @offset: the offset in the page (must be a multiple of 4)
|
|
*
|
|
* Prepares the page to be read in the flash memory :
|
|
* - tell ASIC to map the flash pages
|
|
* - tell ASIC to be in read mode
|
|
*
|
|
* After a call to this method, a call to doc_read_page_finish is mandatory,
|
|
* to end the read cycle of the flash.
|
|
*
|
|
* Read data from a flash page. The length to be read must be between 0 and
|
|
* (page_size + oob_size + wear_size), ie. 532, and a multiple of 4 (because
|
|
* the extra bytes reading is not implemented).
|
|
*
|
|
* As pages are grouped by 2 (in 2 planes), reading from a page must be done
|
|
* in two steps:
|
|
* - one read of 512 bytes at offset 0
|
|
* - one read of 512 bytes at offset 512 + 16
|
|
*
|
|
* Returns 0 if successful, -EIO if a read error occurred.
|
|
*/
|
|
static int doc_read_page_prepare(struct docg3 *docg3, int block0, int block1,
|
|
int page, int offset)
|
|
{
|
|
int wear_area = 0, ret = 0;
|
|
|
|
doc_dbg("doc_read_page_prepare(blocks=(%d,%d), page=%d, ofsInPage=%d)\n",
|
|
block0, block1, page, offset);
|
|
if (offset >= DOC_LAYOUT_WEAR_OFFSET)
|
|
wear_area = 1;
|
|
if (!wear_area && offset > (DOC_LAYOUT_PAGE_OOB_SIZE * 2))
|
|
return -EINVAL;
|
|
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
ret = doc_reset_seq(docg3);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/* Program the flash address block and page */
|
|
ret = doc_read_seek(docg3, block0, block1, page, wear_area, offset);
|
|
if (ret)
|
|
goto err;
|
|
|
|
doc_flash_command(docg3, DOC_CMD_READ_ALL_PLANES);
|
|
doc_delay(docg3, 2);
|
|
doc_wait_ready(docg3);
|
|
|
|
doc_flash_command(docg3, DOC_CMD_SET_ADDR_READ);
|
|
doc_delay(docg3, 1);
|
|
if (offset >= DOC_LAYOUT_PAGE_SIZE * 2)
|
|
offset -= 2 * DOC_LAYOUT_PAGE_SIZE;
|
|
doc_flash_address(docg3, offset >> 2);
|
|
doc_delay(docg3, 1);
|
|
doc_wait_ready(docg3);
|
|
|
|
doc_flash_command(docg3, DOC_CMD_READ_FLASH);
|
|
|
|
return 0;
|
|
err:
|
|
doc_writeb(docg3, 0, DOC_DATAEND);
|
|
doc_delay(docg3, 2);
|
|
return -EIO;
|
|
}
|
|
|
|
/**
|
|
* doc_read_page_getbytes - Reads bytes from a prepared page
|
|
* @docg3: the device
|
|
* @len: the number of bytes to be read (must be a multiple of 4)
|
|
* @buf: the buffer to be filled in (or NULL is forget bytes)
|
|
* @first: 1 if first time read, DOC_READADDRESS should be set
|
|
* @last_odd: 1 if last read ended up on an odd byte
|
|
*
|
|
* Reads bytes from a prepared page. There is a trickery here : if the last read
|
|
* ended up on an odd offset in the 1024 bytes double page, ie. between the 2
|
|
* planes, the first byte must be read apart. If a word (16bit) read was used,
|
|
* the read would return the byte of plane 2 as low *and* high endian, which
|
|
* will mess the read.
|
|
*
|
|
*/
|
|
static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
|
|
int first, int last_odd)
|
|
{
|
|
if (last_odd && len > 0) {
|
|
doc_read_data_area(docg3, buf, 1, first);
|
|
doc_read_data_area(docg3, buf ? buf + 1 : buf, len - 1, 0);
|
|
} else {
|
|
doc_read_data_area(docg3, buf, len, first);
|
|
}
|
|
doc_delay(docg3, 2);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* doc_write_page_putbytes - Writes bytes into a prepared page
|
|
* @docg3: the device
|
|
* @len: the number of bytes to be written
|
|
* @buf: the buffer of input bytes
|
|
*
|
|
*/
|
|
static void doc_write_page_putbytes(struct docg3 *docg3, int len,
|
|
const u_char *buf)
|
|
{
|
|
doc_write_data_area(docg3, buf, len);
|
|
doc_delay(docg3, 2);
|
|
}
|
|
|
|
/**
|
|
* doc_get_bch_hw_ecc - Get hardware calculated BCH ECC
|
|
* @docg3: the device
|
|
* @hwecc: the array of 7 integers where the hardware ecc will be stored
|
|
*/
|
|
static void doc_get_bch_hw_ecc(struct docg3 *docg3, u8 *hwecc)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
|
|
hwecc[i] = doc_register_readb(docg3, DOC_BCH_HW_ECC(i));
|
|
}
|
|
|
|
/**
|
|
* doc_page_finish - Ends reading/writing of a flash page
|
|
* @docg3: the device
|
|
*/
|
|
static void doc_page_finish(struct docg3 *docg3)
|
|
{
|
|
doc_writeb(docg3, 0, DOC_DATAEND);
|
|
doc_delay(docg3, 2);
|
|
}
|
|
|
|
/**
|
|
* doc_read_page_finish - Ends reading of a flash page
|
|
* @docg3: the device
|
|
*
|
|
* As a side effect, resets the chip selector to 0. This ensures that after each
|
|
* read operation, the floor 0 is selected. Therefore, if the systems halts, the
|
|
* reboot will boot on floor 0, where the IPL is.
|
|
*/
|
|
static void doc_read_page_finish(struct docg3 *docg3)
|
|
{
|
|
doc_page_finish(docg3);
|
|
doc_set_device_id(docg3, 0);
|
|
}
|
|
|
|
/**
|
|
* calc_block_sector - Calculate blocks, pages and ofs.
|
|
|
|
* @from: offset in flash
|
|
* @block0: first plane block index calculated
|
|
* @block1: second plane block index calculated
|
|
* @page: page calculated
|
|
* @ofs: offset in page
|
|
* @reliable: 0 if docg3 in normal mode, 1 if docg3 in fast mode, 2 if docg3 in
|
|
* reliable mode.
|
|
*
|
|
* The calculation is based on the reliable/normal mode. In normal mode, the 64
|
|
* pages of a block are available. In reliable mode, as pages 2*n and 2*n+1 are
|
|
* clones, only 32 pages per block are available.
|
|
*/
|
|
static void calc_block_sector(loff_t from, int *block0, int *block1, int *page,
|
|
int *ofs, int reliable)
|
|
{
|
|
uint sector, pages_biblock;
|
|
|
|
pages_biblock = DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES;
|
|
if (reliable == 1 || reliable == 2)
|
|
pages_biblock /= 2;
|
|
|
|
sector = from / DOC_LAYOUT_PAGE_SIZE;
|
|
*block0 = sector / pages_biblock * DOC_LAYOUT_NBPLANES;
|
|
*block1 = *block0 + 1;
|
|
*page = sector % pages_biblock;
|
|
*page /= DOC_LAYOUT_NBPLANES;
|
|
if (reliable == 1 || reliable == 2)
|
|
*page *= 2;
|
|
if (sector % 2)
|
|
*ofs = DOC_LAYOUT_PAGE_OOB_SIZE;
|
|
else
|
|
*ofs = 0;
|
|
}
|
|
|
|
/**
|
|
* doc_read_oob - Read out of band bytes from flash
|
|
* @mtd: the device
|
|
* @from: the offset from first block and first page, in bytes, aligned on page
|
|
* size
|
|
* @ops: the mtd oob structure
|
|
*
|
|
* Reads flash memory OOB area of pages.
|
|
*
|
|
* Returns 0 if read successful, of -EIO, -EINVAL if an error occurred
|
|
*/
|
|
static int doc_read_oob(struct mtd_info *mtd, loff_t from,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
int block0, block1, page, ret, skip, ofs = 0;
|
|
u8 *oobbuf = ops->oobbuf;
|
|
u8 *buf = ops->datbuf;
|
|
size_t len, ooblen, nbdata, nboob;
|
|
u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1;
|
|
int max_bitflips = 0;
|
|
|
|
if (buf)
|
|
len = ops->len;
|
|
else
|
|
len = 0;
|
|
if (oobbuf)
|
|
ooblen = ops->ooblen;
|
|
else
|
|
ooblen = 0;
|
|
|
|
if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB)
|
|
oobbuf += ops->ooboffs;
|
|
|
|
doc_dbg("doc_read_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",
|
|
from, ops->mode, buf, len, oobbuf, ooblen);
|
|
if (ooblen % DOC_LAYOUT_OOB_SIZE)
|
|
return -EINVAL;
|
|
|
|
if (from + len > mtd->size)
|
|
return -EINVAL;
|
|
|
|
ops->oobretlen = 0;
|
|
ops->retlen = 0;
|
|
ret = 0;
|
|
skip = from % DOC_LAYOUT_PAGE_SIZE;
|
|
mutex_lock(&docg3->cascade->lock);
|
|
while (ret >= 0 && (len > 0 || ooblen > 0)) {
|
|
calc_block_sector(from - skip, &block0, &block1, &page, &ofs,
|
|
docg3->reliable);
|
|
nbdata = min_t(size_t, len, DOC_LAYOUT_PAGE_SIZE - skip);
|
|
nboob = min_t(size_t, ooblen, (size_t)DOC_LAYOUT_OOB_SIZE);
|
|
ret = doc_read_page_prepare(docg3, block0, block1, page, ofs);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
|
|
if (ret < 0)
|
|
goto err_in_read;
|
|
ret = doc_read_page_getbytes(docg3, skip, NULL, 1, 0);
|
|
if (ret < skip)
|
|
goto err_in_read;
|
|
ret = doc_read_page_getbytes(docg3, nbdata, buf, 0, skip % 2);
|
|
if (ret < nbdata)
|
|
goto err_in_read;
|
|
doc_read_page_getbytes(docg3,
|
|
DOC_LAYOUT_PAGE_SIZE - nbdata - skip,
|
|
NULL, 0, (skip + nbdata) % 2);
|
|
ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0, 0);
|
|
if (ret < nboob)
|
|
goto err_in_read;
|
|
doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE - nboob,
|
|
NULL, 0, nboob % 2);
|
|
|
|
doc_get_bch_hw_ecc(docg3, hwecc);
|
|
eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1);
|
|
|
|
if (nboob >= DOC_LAYOUT_OOB_SIZE) {
|
|
doc_dbg("OOB - INFO: %*phC\n", 7, oobbuf);
|
|
doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]);
|
|
doc_dbg("OOB - BCH_ECC: %*phC\n", 7, oobbuf + 8);
|
|
doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]);
|
|
}
|
|
doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1);
|
|
doc_dbg("ECC HW_ECC: %*phC\n", 7, hwecc);
|
|
|
|
ret = -EIO;
|
|
if (is_prot_seq_error(docg3))
|
|
goto err_in_read;
|
|
ret = 0;
|
|
if ((block0 >= DOC_LAYOUT_BLOCK_FIRST_DATA) &&
|
|
(eccconf1 & DOC_ECCCONF1_BCH_SYNDROM_ERR) &&
|
|
(eccconf1 & DOC_ECCCONF1_PAGE_IS_WRITTEN) &&
|
|
(ops->mode != MTD_OPS_RAW) &&
|
|
(nbdata == DOC_LAYOUT_PAGE_SIZE)) {
|
|
ret = doc_ecc_bch_fix_data(docg3, buf, hwecc);
|
|
if (ret < 0) {
|
|
mtd->ecc_stats.failed++;
|
|
ret = -EBADMSG;
|
|
}
|
|
if (ret > 0) {
|
|
mtd->ecc_stats.corrected += ret;
|
|
max_bitflips = max(max_bitflips, ret);
|
|
ret = max_bitflips;
|
|
}
|
|
}
|
|
|
|
doc_read_page_finish(docg3);
|
|
ops->retlen += nbdata;
|
|
ops->oobretlen += nboob;
|
|
buf += nbdata;
|
|
oobbuf += nboob;
|
|
len -= nbdata;
|
|
ooblen -= nboob;
|
|
from += DOC_LAYOUT_PAGE_SIZE;
|
|
skip = 0;
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
return ret;
|
|
err_in_read:
|
|
doc_read_page_finish(docg3);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* doc_read - Read bytes from flash
|
|
* @mtd: the device
|
|
* @from: the offset from first block and first page, in bytes, aligned on page
|
|
* size
|
|
* @len: the number of bytes to read (must be a multiple of 4)
|
|
* @retlen: the number of bytes actually read
|
|
* @buf: the filled in buffer
|
|
*
|
|
* Reads flash memory pages. This function does not read the OOB chunk, but only
|
|
* the page data.
|
|
*
|
|
* Returns 0 if read successful, of -EIO, -EINVAL if an error occurred
|
|
*/
|
|
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
struct mtd_oob_ops ops;
|
|
size_t ret;
|
|
|
|
memset(&ops, 0, sizeof(ops));
|
|
ops.datbuf = buf;
|
|
ops.len = len;
|
|
ops.mode = MTD_OPS_AUTO_OOB;
|
|
|
|
ret = doc_read_oob(mtd, from, &ops);
|
|
*retlen = ops.retlen;
|
|
return ret;
|
|
}
|
|
|
|
static int doc_reload_bbt(struct docg3 *docg3)
|
|
{
|
|
int block = DOC_LAYOUT_BLOCK_BBT;
|
|
int ret = 0, nbpages, page;
|
|
u_char *buf = docg3->bbt;
|
|
|
|
nbpages = DIV_ROUND_UP(docg3->max_block + 1, 8 * DOC_LAYOUT_PAGE_SIZE);
|
|
for (page = 0; !ret && (page < nbpages); page++) {
|
|
ret = doc_read_page_prepare(docg3, block, block + 1,
|
|
page + DOC_LAYOUT_PAGE_BBT, 0);
|
|
if (!ret)
|
|
ret = doc_read_page_ecc_init(docg3,
|
|
DOC_LAYOUT_PAGE_SIZE);
|
|
if (!ret)
|
|
doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE,
|
|
buf, 1, 0);
|
|
buf += DOC_LAYOUT_PAGE_SIZE;
|
|
}
|
|
doc_read_page_finish(docg3);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* doc_block_isbad - Checks whether a block is good or not
|
|
* @mtd: the device
|
|
* @from: the offset to find the correct block
|
|
*
|
|
* Returns 1 if block is bad, 0 if block is good
|
|
*/
|
|
static int doc_block_isbad(struct mtd_info *mtd, loff_t from)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
int block0, block1, page, ofs, is_good;
|
|
|
|
calc_block_sector(from, &block0, &block1, &page, &ofs,
|
|
docg3->reliable);
|
|
doc_dbg("doc_block_isbad(from=%lld) => block=(%d,%d), page=%d, ofs=%d\n",
|
|
from, block0, block1, page, ofs);
|
|
|
|
if (block0 < DOC_LAYOUT_BLOCK_FIRST_DATA)
|
|
return 0;
|
|
if (block1 > docg3->max_block)
|
|
return -EINVAL;
|
|
|
|
is_good = docg3->bbt[block0 >> 3] & (1 << (block0 & 0x7));
|
|
return !is_good;
|
|
}
|
|
|
|
#if 0
|
|
/**
|
|
* doc_get_erase_count - Get block erase count
|
|
* @docg3: the device
|
|
* @from: the offset in which the block is.
|
|
*
|
|
* Get the number of times a block was erased. The number is the maximum of
|
|
* erase times between first and second plane (which should be equal normally).
|
|
*
|
|
* Returns The number of erases, or -EINVAL or -EIO on error.
|
|
*/
|
|
static int doc_get_erase_count(struct docg3 *docg3, loff_t from)
|
|
{
|
|
u8 buf[DOC_LAYOUT_WEAR_SIZE];
|
|
int ret, plane1_erase_count, plane2_erase_count;
|
|
int block0, block1, page, ofs;
|
|
|
|
doc_dbg("doc_get_erase_count(from=%lld, buf=%p)\n", from, buf);
|
|
if (from % DOC_LAYOUT_PAGE_SIZE)
|
|
return -EINVAL;
|
|
calc_block_sector(from, &block0, &block1, &page, &ofs, docg3->reliable);
|
|
if (block1 > docg3->max_block)
|
|
return -EINVAL;
|
|
|
|
ret = doc_reset_seq(docg3);
|
|
if (!ret)
|
|
ret = doc_read_page_prepare(docg3, block0, block1, page,
|
|
ofs + DOC_LAYOUT_WEAR_OFFSET, 0);
|
|
if (!ret)
|
|
ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE,
|
|
buf, 1, 0);
|
|
doc_read_page_finish(docg3);
|
|
|
|
if (ret || (buf[0] != DOC_ERASE_MARK) || (buf[2] != DOC_ERASE_MARK))
|
|
return -EIO;
|
|
plane1_erase_count = (u8)(~buf[1]) | ((u8)(~buf[4]) << 8)
|
|
| ((u8)(~buf[5]) << 16);
|
|
plane2_erase_count = (u8)(~buf[3]) | ((u8)(~buf[6]) << 8)
|
|
| ((u8)(~buf[7]) << 16);
|
|
|
|
return max(plane1_erase_count, plane2_erase_count);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* doc_get_op_status - get erase/write operation status
|
|
* @docg3: the device
|
|
*
|
|
* Queries the status from the chip, and returns it
|
|
*
|
|
* Returns the status (bits DOC_PLANES_STATUS_*)
|
|
*/
|
|
static int doc_get_op_status(struct docg3 *docg3)
|
|
{
|
|
u8 status;
|
|
|
|
doc_flash_sequence(docg3, DOC_SEQ_PLANES_STATUS);
|
|
doc_flash_command(docg3, DOC_CMD_PLANES_STATUS);
|
|
doc_delay(docg3, 5);
|
|
|
|
doc_ecc_disable(docg3);
|
|
doc_read_data_area(docg3, &status, 1, 1);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* doc_write_erase_wait_status - wait for write or erase completion
|
|
* @docg3: the device
|
|
*
|
|
* Wait for the chip to be ready again after erase or write operation, and check
|
|
* erase/write status.
|
|
*
|
|
* Returns 0 if erase successful, -EIO if erase/write issue, -ETIMEOUT if
|
|
* timeout
|
|
*/
|
|
static int doc_write_erase_wait_status(struct docg3 *docg3)
|
|
{
|
|
int i, status, ret = 0;
|
|
|
|
for (i = 0; !doc_is_ready(docg3) && i < 5; i++)
|
|
msleep(20);
|
|
if (!doc_is_ready(docg3)) {
|
|
doc_dbg("Timeout reached and the chip is still not ready\n");
|
|
ret = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
status = doc_get_op_status(docg3);
|
|
if (status & DOC_PLANES_STATUS_FAIL) {
|
|
doc_dbg("Erase/Write failed on (a) plane(s), status = %x\n",
|
|
status);
|
|
ret = -EIO;
|
|
}
|
|
|
|
out:
|
|
doc_page_finish(docg3);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* doc_erase_block - Erase a couple of blocks
|
|
* @docg3: the device
|
|
* @block0: the first block to erase (leftmost plane)
|
|
* @block1: the second block to erase (rightmost plane)
|
|
*
|
|
* Erase both blocks, and return operation status
|
|
*
|
|
* Returns 0 if erase successful, -EIO if erase issue, -ETIMEOUT if chip not
|
|
* ready for too long
|
|
*/
|
|
static int doc_erase_block(struct docg3 *docg3, int block0, int block1)
|
|
{
|
|
int ret, sector;
|
|
|
|
doc_dbg("doc_erase_block(blocks=(%d,%d))\n", block0, block1);
|
|
ret = doc_reset_seq(docg3);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
doc_set_reliable_mode(docg3);
|
|
doc_flash_sequence(docg3, DOC_SEQ_ERASE);
|
|
|
|
sector = block0 << DOC_ADDR_BLOCK_SHIFT;
|
|
doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
|
|
doc_setup_addr_sector(docg3, sector);
|
|
sector = block1 << DOC_ADDR_BLOCK_SHIFT;
|
|
doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
|
|
doc_setup_addr_sector(docg3, sector);
|
|
doc_delay(docg3, 1);
|
|
|
|
doc_flash_command(docg3, DOC_CMD_ERASECYCLE2);
|
|
doc_delay(docg3, 2);
|
|
|
|
if (is_prot_seq_error(docg3)) {
|
|
doc_err("Erase blocks %d,%d error\n", block0, block1);
|
|
return -EIO;
|
|
}
|
|
|
|
return doc_write_erase_wait_status(docg3);
|
|
}
|
|
|
|
/**
|
|
* doc_erase - Erase a portion of the chip
|
|
* @mtd: the device
|
|
* @info: the erase info
|
|
*
|
|
* Erase a bunch of contiguous blocks, by pairs, as a "mtd" page of 1024 is
|
|
* split into 2 pages of 512 bytes on 2 contiguous blocks.
|
|
*
|
|
* Returns 0 if erase successful, -EINVAL if addressing error, -EIO if erase
|
|
* issue
|
|
*/
|
|
static int doc_erase(struct mtd_info *mtd, struct erase_info *info)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
uint64_t len;
|
|
int block0, block1, page, ret, ofs = 0;
|
|
|
|
doc_dbg("doc_erase(from=%lld, len=%lld\n", info->addr, info->len);
|
|
|
|
info->state = MTD_ERASE_PENDING;
|
|
calc_block_sector(info->addr + info->len, &block0, &block1, &page,
|
|
&ofs, docg3->reliable);
|
|
ret = -EINVAL;
|
|
if (info->addr + info->len > mtd->size || page || ofs)
|
|
goto reset_err;
|
|
|
|
ret = 0;
|
|
calc_block_sector(info->addr, &block0, &block1, &page, &ofs,
|
|
docg3->reliable);
|
|
mutex_lock(&docg3->cascade->lock);
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
doc_set_reliable_mode(docg3);
|
|
for (len = info->len; !ret && len > 0; len -= mtd->erasesize) {
|
|
info->state = MTD_ERASING;
|
|
ret = doc_erase_block(docg3, block0, block1);
|
|
block0 += 2;
|
|
block1 += 2;
|
|
}
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
if (ret)
|
|
goto reset_err;
|
|
|
|
info->state = MTD_ERASE_DONE;
|
|
return 0;
|
|
|
|
reset_err:
|
|
info->state = MTD_ERASE_FAILED;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* doc_write_page - Write a single page to the chip
|
|
* @docg3: the device
|
|
* @to: the offset from first block and first page, in bytes, aligned on page
|
|
* size
|
|
* @buf: buffer to get bytes from
|
|
* @oob: buffer to get out of band bytes from (can be NULL if no OOB should be
|
|
* written)
|
|
* @autoecc: if 0, all 16 bytes from OOB are taken, regardless of HW Hamming or
|
|
* BCH computations. If 1, only bytes 0-7 and byte 15 are taken,
|
|
* remaining ones are filled with hardware Hamming and BCH
|
|
* computations. Its value is not meaningfull is oob == NULL.
|
|
*
|
|
* Write one full page (ie. 1 page split on two planes), of 512 bytes, with the
|
|
* OOB data. The OOB ECC is automatically computed by the hardware Hamming and
|
|
* BCH generator if autoecc is not null.
|
|
*
|
|
* Returns 0 if write successful, -EIO if write error, -EAGAIN if timeout
|
|
*/
|
|
static int doc_write_page(struct docg3 *docg3, loff_t to, const u_char *buf,
|
|
const u_char *oob, int autoecc)
|
|
{
|
|
int block0, block1, page, ret, ofs = 0;
|
|
u8 hwecc[DOC_ECC_BCH_SIZE], hamming;
|
|
|
|
doc_dbg("doc_write_page(to=%lld)\n", to);
|
|
calc_block_sector(to, &block0, &block1, &page, &ofs, docg3->reliable);
|
|
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
ret = doc_reset_seq(docg3);
|
|
if (ret)
|
|
goto err;
|
|
|
|
/* Program the flash address block and page */
|
|
ret = doc_write_seek(docg3, block0, block1, page, ofs);
|
|
if (ret)
|
|
goto err;
|
|
|
|
doc_write_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
|
|
doc_delay(docg3, 2);
|
|
doc_write_page_putbytes(docg3, DOC_LAYOUT_PAGE_SIZE, buf);
|
|
|
|
if (oob && autoecc) {
|
|
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ, oob);
|
|
doc_delay(docg3, 2);
|
|
oob += DOC_LAYOUT_OOB_UNUSED_OFS;
|
|
|
|
hamming = doc_register_readb(docg3, DOC_HAMMINGPARITY);
|
|
doc_delay(docg3, 2);
|
|
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_HAMMING_SZ,
|
|
&hamming);
|
|
doc_delay(docg3, 2);
|
|
|
|
doc_get_bch_hw_ecc(docg3, hwecc);
|
|
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_BCH_SZ, hwecc);
|
|
doc_delay(docg3, 2);
|
|
|
|
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_UNUSED_SZ, oob);
|
|
}
|
|
if (oob && !autoecc)
|
|
doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_SIZE, oob);
|
|
|
|
doc_delay(docg3, 2);
|
|
doc_page_finish(docg3);
|
|
doc_delay(docg3, 2);
|
|
doc_flash_command(docg3, DOC_CMD_PROG_CYCLE2);
|
|
doc_delay(docg3, 2);
|
|
|
|
/*
|
|
* The wait status will perform another doc_page_finish() call, but that
|
|
* seems to please the docg3, so leave it.
|
|
*/
|
|
ret = doc_write_erase_wait_status(docg3);
|
|
return ret;
|
|
err:
|
|
doc_read_page_finish(docg3);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* doc_guess_autoecc - Guess autoecc mode from mbd_oob_ops
|
|
* @ops: the oob operations
|
|
*
|
|
* Returns 0 or 1 if success, -EINVAL if invalid oob mode
|
|
*/
|
|
static int doc_guess_autoecc(struct mtd_oob_ops *ops)
|
|
{
|
|
int autoecc;
|
|
|
|
switch (ops->mode) {
|
|
case MTD_OPS_PLACE_OOB:
|
|
case MTD_OPS_AUTO_OOB:
|
|
autoecc = 1;
|
|
break;
|
|
case MTD_OPS_RAW:
|
|
autoecc = 0;
|
|
break;
|
|
default:
|
|
autoecc = -EINVAL;
|
|
}
|
|
return autoecc;
|
|
}
|
|
|
|
/**
|
|
* doc_fill_autooob - Fill a 16 bytes OOB from 8 non-ECC bytes
|
|
* @dst: the target 16 bytes OOB buffer
|
|
* @oobsrc: the source 8 bytes non-ECC OOB buffer
|
|
*
|
|
*/
|
|
static void doc_fill_autooob(u8 *dst, u8 *oobsrc)
|
|
{
|
|
memcpy(dst, oobsrc, DOC_LAYOUT_OOB_PAGEINFO_SZ);
|
|
dst[DOC_LAYOUT_OOB_UNUSED_OFS] = oobsrc[DOC_LAYOUT_OOB_PAGEINFO_SZ];
|
|
}
|
|
|
|
/**
|
|
* doc_backup_oob - Backup OOB into docg3 structure
|
|
* @docg3: the device
|
|
* @to: the page offset in the chip
|
|
* @ops: the OOB size and buffer
|
|
*
|
|
* As the docg3 should write a page with its OOB in one pass, and some userland
|
|
* applications do write_oob() to setup the OOB and then write(), store the OOB
|
|
* into a temporary storage. This is very dangerous, as 2 concurrent
|
|
* applications could store an OOB, and then write their pages (which will
|
|
* result into one having its OOB corrupted).
|
|
*
|
|
* The only reliable way would be for userland to call doc_write_oob() with both
|
|
* the page data _and_ the OOB area.
|
|
*
|
|
* Returns 0 if success, -EINVAL if ops content invalid
|
|
*/
|
|
static int doc_backup_oob(struct docg3 *docg3, loff_t to,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
int ooblen = ops->ooblen, autoecc;
|
|
|
|
if (ooblen != DOC_LAYOUT_OOB_SIZE)
|
|
return -EINVAL;
|
|
autoecc = doc_guess_autoecc(ops);
|
|
if (autoecc < 0)
|
|
return autoecc;
|
|
|
|
docg3->oob_write_ofs = to;
|
|
docg3->oob_autoecc = autoecc;
|
|
if (ops->mode == MTD_OPS_AUTO_OOB) {
|
|
doc_fill_autooob(docg3->oob_write_buf, ops->oobbuf);
|
|
ops->oobretlen = 8;
|
|
} else {
|
|
memcpy(docg3->oob_write_buf, ops->oobbuf, DOC_LAYOUT_OOB_SIZE);
|
|
ops->oobretlen = DOC_LAYOUT_OOB_SIZE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* doc_write_oob - Write out of band bytes to flash
|
|
* @mtd: the device
|
|
* @ofs: the offset from first block and first page, in bytes, aligned on page
|
|
* size
|
|
* @ops: the mtd oob structure
|
|
*
|
|
* Either write OOB data into a temporary buffer, for the subsequent write
|
|
* page. The provided OOB should be 16 bytes long. If a data buffer is provided
|
|
* as well, issue the page write.
|
|
* Or provide data without OOB, and then a all zeroed OOB will be used (ECC will
|
|
* still be filled in if asked for).
|
|
*
|
|
* Returns 0 is successful, EINVAL if length is not 14 bytes
|
|
*/
|
|
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
int ret, autoecc, oobdelta;
|
|
u8 *oobbuf = ops->oobbuf;
|
|
u8 *buf = ops->datbuf;
|
|
size_t len, ooblen;
|
|
u8 oob[DOC_LAYOUT_OOB_SIZE];
|
|
|
|
if (buf)
|
|
len = ops->len;
|
|
else
|
|
len = 0;
|
|
if (oobbuf)
|
|
ooblen = ops->ooblen;
|
|
else
|
|
ooblen = 0;
|
|
|
|
if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB)
|
|
oobbuf += ops->ooboffs;
|
|
|
|
doc_dbg("doc_write_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",
|
|
ofs, ops->mode, buf, len, oobbuf, ooblen);
|
|
switch (ops->mode) {
|
|
case MTD_OPS_PLACE_OOB:
|
|
case MTD_OPS_RAW:
|
|
oobdelta = mtd->oobsize;
|
|
break;
|
|
case MTD_OPS_AUTO_OOB:
|
|
oobdelta = mtd->ecclayout->oobavail;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if ((len % DOC_LAYOUT_PAGE_SIZE) || (ooblen % oobdelta) ||
|
|
(ofs % DOC_LAYOUT_PAGE_SIZE))
|
|
return -EINVAL;
|
|
if (len && ooblen &&
|
|
(len / DOC_LAYOUT_PAGE_SIZE) != (ooblen / oobdelta))
|
|
return -EINVAL;
|
|
if (ofs + len > mtd->size)
|
|
return -EINVAL;
|
|
|
|
ops->oobretlen = 0;
|
|
ops->retlen = 0;
|
|
ret = 0;
|
|
if (len == 0 && ooblen == 0)
|
|
return -EINVAL;
|
|
if (len == 0 && ooblen > 0)
|
|
return doc_backup_oob(docg3, ofs, ops);
|
|
|
|
autoecc = doc_guess_autoecc(ops);
|
|
if (autoecc < 0)
|
|
return autoecc;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
while (!ret && len > 0) {
|
|
memset(oob, 0, sizeof(oob));
|
|
if (ofs == docg3->oob_write_ofs)
|
|
memcpy(oob, docg3->oob_write_buf, DOC_LAYOUT_OOB_SIZE);
|
|
else if (ooblen > 0 && ops->mode == MTD_OPS_AUTO_OOB)
|
|
doc_fill_autooob(oob, oobbuf);
|
|
else if (ooblen > 0)
|
|
memcpy(oob, oobbuf, DOC_LAYOUT_OOB_SIZE);
|
|
ret = doc_write_page(docg3, ofs, buf, oob, autoecc);
|
|
|
|
ofs += DOC_LAYOUT_PAGE_SIZE;
|
|
len -= DOC_LAYOUT_PAGE_SIZE;
|
|
buf += DOC_LAYOUT_PAGE_SIZE;
|
|
if (ooblen) {
|
|
oobbuf += oobdelta;
|
|
ooblen -= oobdelta;
|
|
ops->oobretlen += oobdelta;
|
|
}
|
|
ops->retlen += DOC_LAYOUT_PAGE_SIZE;
|
|
}
|
|
|
|
doc_set_device_id(docg3, 0);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* doc_write - Write a buffer to the chip
|
|
* @mtd: the device
|
|
* @to: the offset from first block and first page, in bytes, aligned on page
|
|
* size
|
|
* @len: the number of bytes to write (must be a full page size, ie. 512)
|
|
* @retlen: the number of bytes actually written (0 or 512)
|
|
* @buf: the buffer to get bytes from
|
|
*
|
|
* Writes data to the chip.
|
|
*
|
|
* Returns 0 if write successful, -EIO if write error
|
|
*/
|
|
static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
|
|
size_t *retlen, const u_char *buf)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
int ret;
|
|
struct mtd_oob_ops ops;
|
|
|
|
doc_dbg("doc_write(to=%lld, len=%zu)\n", to, len);
|
|
ops.datbuf = (char *)buf;
|
|
ops.len = len;
|
|
ops.mode = MTD_OPS_PLACE_OOB;
|
|
ops.oobbuf = NULL;
|
|
ops.ooblen = 0;
|
|
ops.ooboffs = 0;
|
|
|
|
ret = doc_write_oob(mtd, to, &ops);
|
|
*retlen = ops.retlen;
|
|
return ret;
|
|
}
|
|
|
|
static struct docg3 *sysfs_dev2docg3(struct device *dev,
|
|
struct device_attribute *attr)
|
|
{
|
|
int floor;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct mtd_info **docg3_floors = platform_get_drvdata(pdev);
|
|
|
|
floor = attr->attr.name[1] - '0';
|
|
if (floor < 0 || floor >= DOC_MAX_NBFLOORS)
|
|
return NULL;
|
|
else
|
|
return docg3_floors[floor]->priv;
|
|
}
|
|
|
|
static ssize_t dps0_is_key_locked(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
|
|
int dps0;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
|
|
doc_set_device_id(docg3, 0);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
return sprintf(buf, "%d\n", !(dps0 & DOC_DPS_KEY_OK));
|
|
}
|
|
|
|
static ssize_t dps1_is_key_locked(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
|
|
int dps1;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
|
|
doc_set_device_id(docg3, 0);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
return sprintf(buf, "%d\n", !(dps1 & DOC_DPS_KEY_OK));
|
|
}
|
|
|
|
static ssize_t dps0_insert_key(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
|
|
int i;
|
|
|
|
if (count != DOC_LAYOUT_DPS_KEY_LENGTH)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++)
|
|
doc_writeb(docg3, buf[i], DOC_DPS0_KEY);
|
|
doc_set_device_id(docg3, 0);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t dps1_insert_key(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
|
|
int i;
|
|
|
|
if (count != DOC_LAYOUT_DPS_KEY_LENGTH)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++)
|
|
doc_writeb(docg3, buf[i], DOC_DPS1_KEY);
|
|
doc_set_device_id(docg3, 0);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
return count;
|
|
}
|
|
|
|
#define FLOOR_SYSFS(id) { \
|
|
__ATTR(f##id##_dps0_is_keylocked, S_IRUGO, dps0_is_key_locked, NULL), \
|
|
__ATTR(f##id##_dps1_is_keylocked, S_IRUGO, dps1_is_key_locked, NULL), \
|
|
__ATTR(f##id##_dps0_protection_key, S_IWUGO, NULL, dps0_insert_key), \
|
|
__ATTR(f##id##_dps1_protection_key, S_IWUGO, NULL, dps1_insert_key), \
|
|
}
|
|
|
|
static struct device_attribute doc_sys_attrs[DOC_MAX_NBFLOORS][4] = {
|
|
FLOOR_SYSFS(0), FLOOR_SYSFS(1), FLOOR_SYSFS(2), FLOOR_SYSFS(3)
|
|
};
|
|
|
|
static int doc_register_sysfs(struct platform_device *pdev,
|
|
struct docg3_cascade *cascade)
|
|
{
|
|
int ret = 0, floor, i = 0;
|
|
struct device *dev = &pdev->dev;
|
|
|
|
for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS &&
|
|
cascade->floors[floor]; floor++)
|
|
for (i = 0; !ret && i < 4; i++)
|
|
ret = device_create_file(dev, &doc_sys_attrs[floor][i]);
|
|
if (!ret)
|
|
return 0;
|
|
do {
|
|
while (--i >= 0)
|
|
device_remove_file(dev, &doc_sys_attrs[floor][i]);
|
|
i = 4;
|
|
} while (--floor >= 0);
|
|
return ret;
|
|
}
|
|
|
|
static void doc_unregister_sysfs(struct platform_device *pdev,
|
|
struct docg3_cascade *cascade)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
int floor, i;
|
|
|
|
for (floor = 0; floor < DOC_MAX_NBFLOORS && cascade->floors[floor];
|
|
floor++)
|
|
for (i = 0; i < 4; i++)
|
|
device_remove_file(dev, &doc_sys_attrs[floor][i]);
|
|
}
|
|
|
|
/*
|
|
* Debug sysfs entries
|
|
*/
|
|
static int dbg_flashctrl_show(struct seq_file *s, void *p)
|
|
{
|
|
struct docg3 *docg3 = (struct docg3 *)s->private;
|
|
|
|
int pos = 0;
|
|
u8 fctrl;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
pos += seq_printf(s,
|
|
"FlashControl : 0x%02x (%s,CE# %s,%s,%s,flash %s)\n",
|
|
fctrl,
|
|
fctrl & DOC_CTRL_VIOLATION ? "protocol violation" : "-",
|
|
fctrl & DOC_CTRL_CE ? "active" : "inactive",
|
|
fctrl & DOC_CTRL_PROTECTION_ERROR ? "protection error" : "-",
|
|
fctrl & DOC_CTRL_SEQUENCE_ERROR ? "sequence error" : "-",
|
|
fctrl & DOC_CTRL_FLASHREADY ? "ready" : "not ready");
|
|
return pos;
|
|
}
|
|
DEBUGFS_RO_ATTR(flashcontrol, dbg_flashctrl_show);
|
|
|
|
static int dbg_asicmode_show(struct seq_file *s, void *p)
|
|
{
|
|
struct docg3 *docg3 = (struct docg3 *)s->private;
|
|
|
|
int pos = 0, pctrl, mode;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
pctrl = doc_register_readb(docg3, DOC_ASICMODE);
|
|
mode = pctrl & 0x03;
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
pos += seq_printf(s,
|
|
"%04x : RAM_WE=%d,RSTIN_RESET=%d,BDETCT_RESET=%d,WRITE_ENABLE=%d,POWERDOWN=%d,MODE=%d%d (",
|
|
pctrl,
|
|
pctrl & DOC_ASICMODE_RAM_WE ? 1 : 0,
|
|
pctrl & DOC_ASICMODE_RSTIN_RESET ? 1 : 0,
|
|
pctrl & DOC_ASICMODE_BDETCT_RESET ? 1 : 0,
|
|
pctrl & DOC_ASICMODE_MDWREN ? 1 : 0,
|
|
pctrl & DOC_ASICMODE_POWERDOWN ? 1 : 0,
|
|
mode >> 1, mode & 0x1);
|
|
|
|
switch (mode) {
|
|
case DOC_ASICMODE_RESET:
|
|
pos += seq_printf(s, "reset");
|
|
break;
|
|
case DOC_ASICMODE_NORMAL:
|
|
pos += seq_printf(s, "normal");
|
|
break;
|
|
case DOC_ASICMODE_POWERDOWN:
|
|
pos += seq_printf(s, "powerdown");
|
|
break;
|
|
}
|
|
pos += seq_printf(s, ")\n");
|
|
return pos;
|
|
}
|
|
DEBUGFS_RO_ATTR(asic_mode, dbg_asicmode_show);
|
|
|
|
static int dbg_device_id_show(struct seq_file *s, void *p)
|
|
{
|
|
struct docg3 *docg3 = (struct docg3 *)s->private;
|
|
int pos = 0;
|
|
int id;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
id = doc_register_readb(docg3, DOC_DEVICESELECT);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
pos += seq_printf(s, "DeviceId = %d\n", id);
|
|
return pos;
|
|
}
|
|
DEBUGFS_RO_ATTR(device_id, dbg_device_id_show);
|
|
|
|
static int dbg_protection_show(struct seq_file *s, void *p)
|
|
{
|
|
struct docg3 *docg3 = (struct docg3 *)s->private;
|
|
int pos = 0;
|
|
int protect, dps0, dps0_low, dps0_high, dps1, dps1_low, dps1_high;
|
|
|
|
mutex_lock(&docg3->cascade->lock);
|
|
protect = doc_register_readb(docg3, DOC_PROTECTION);
|
|
dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
|
|
dps0_low = doc_register_readw(docg3, DOC_DPS0_ADDRLOW);
|
|
dps0_high = doc_register_readw(docg3, DOC_DPS0_ADDRHIGH);
|
|
dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
|
|
dps1_low = doc_register_readw(docg3, DOC_DPS1_ADDRLOW);
|
|
dps1_high = doc_register_readw(docg3, DOC_DPS1_ADDRHIGH);
|
|
mutex_unlock(&docg3->cascade->lock);
|
|
|
|
pos += seq_printf(s, "Protection = 0x%02x (",
|
|
protect);
|
|
if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK)
|
|
pos += seq_printf(s, "FOUNDRY_OTP_LOCK,");
|
|
if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK)
|
|
pos += seq_printf(s, "CUSTOMER_OTP_LOCK,");
|
|
if (protect & DOC_PROTECT_LOCK_INPUT)
|
|
pos += seq_printf(s, "LOCK_INPUT,");
|
|
if (protect & DOC_PROTECT_STICKY_LOCK)
|
|
pos += seq_printf(s, "STICKY_LOCK,");
|
|
if (protect & DOC_PROTECT_PROTECTION_ENABLED)
|
|
pos += seq_printf(s, "PROTECTION ON,");
|
|
if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK)
|
|
pos += seq_printf(s, "IPL_DOWNLOAD_LOCK,");
|
|
if (protect & DOC_PROTECT_PROTECTION_ERROR)
|
|
pos += seq_printf(s, "PROTECT_ERR,");
|
|
else
|
|
pos += seq_printf(s, "NO_PROTECT_ERR");
|
|
pos += seq_printf(s, ")\n");
|
|
|
|
pos += seq_printf(s, "DPS0 = 0x%02x : "
|
|
"Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, "
|
|
"WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n",
|
|
dps0, dps0_low, dps0_high,
|
|
!!(dps0 & DOC_DPS_OTP_PROTECTED),
|
|
!!(dps0 & DOC_DPS_READ_PROTECTED),
|
|
!!(dps0 & DOC_DPS_WRITE_PROTECTED),
|
|
!!(dps0 & DOC_DPS_HW_LOCK_ENABLED),
|
|
!!(dps0 & DOC_DPS_KEY_OK));
|
|
pos += seq_printf(s, "DPS1 = 0x%02x : "
|
|
"Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, "
|
|
"WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n",
|
|
dps1, dps1_low, dps1_high,
|
|
!!(dps1 & DOC_DPS_OTP_PROTECTED),
|
|
!!(dps1 & DOC_DPS_READ_PROTECTED),
|
|
!!(dps1 & DOC_DPS_WRITE_PROTECTED),
|
|
!!(dps1 & DOC_DPS_HW_LOCK_ENABLED),
|
|
!!(dps1 & DOC_DPS_KEY_OK));
|
|
return pos;
|
|
}
|
|
DEBUGFS_RO_ATTR(protection, dbg_protection_show);
|
|
|
|
static int __init doc_dbg_register(struct docg3 *docg3)
|
|
{
|
|
struct dentry *root, *entry;
|
|
|
|
root = debugfs_create_dir("docg3", NULL);
|
|
if (!root)
|
|
return -ENOMEM;
|
|
|
|
entry = debugfs_create_file("flashcontrol", S_IRUSR, root, docg3,
|
|
&flashcontrol_fops);
|
|
if (entry)
|
|
entry = debugfs_create_file("asic_mode", S_IRUSR, root,
|
|
docg3, &asic_mode_fops);
|
|
if (entry)
|
|
entry = debugfs_create_file("device_id", S_IRUSR, root,
|
|
docg3, &device_id_fops);
|
|
if (entry)
|
|
entry = debugfs_create_file("protection", S_IRUSR, root,
|
|
docg3, &protection_fops);
|
|
if (entry) {
|
|
docg3->debugfs_root = root;
|
|
return 0;
|
|
} else {
|
|
debugfs_remove_recursive(root);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
static void __exit doc_dbg_unregister(struct docg3 *docg3)
|
|
{
|
|
debugfs_remove_recursive(docg3->debugfs_root);
|
|
}
|
|
|
|
/**
|
|
* doc_set_driver_info - Fill the mtd_info structure and docg3 structure
|
|
* @chip_id: The chip ID of the supported chip
|
|
* @mtd: The structure to fill
|
|
*/
|
|
static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
int cfg;
|
|
|
|
cfg = doc_register_readb(docg3, DOC_CONFIGURATION);
|
|
docg3->if_cfg = (cfg & DOC_CONF_IF_CFG ? 1 : 0);
|
|
docg3->reliable = reliable_mode;
|
|
|
|
switch (chip_id) {
|
|
case DOC_CHIPID_G3:
|
|
mtd->name = kasprintf(GFP_KERNEL, "docg3.%d",
|
|
docg3->device_id);
|
|
docg3->max_block = 2047;
|
|
break;
|
|
}
|
|
mtd->type = MTD_NANDFLASH;
|
|
mtd->flags = MTD_CAP_NANDFLASH;
|
|
mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE;
|
|
if (docg3->reliable == 2)
|
|
mtd->size /= 2;
|
|
mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES;
|
|
if (docg3->reliable == 2)
|
|
mtd->erasesize /= 2;
|
|
mtd->writebufsize = mtd->writesize = DOC_LAYOUT_PAGE_SIZE;
|
|
mtd->oobsize = DOC_LAYOUT_OOB_SIZE;
|
|
mtd->owner = THIS_MODULE;
|
|
mtd->_erase = doc_erase;
|
|
mtd->_read = doc_read;
|
|
mtd->_write = doc_write;
|
|
mtd->_read_oob = doc_read_oob;
|
|
mtd->_write_oob = doc_write_oob;
|
|
mtd->_block_isbad = doc_block_isbad;
|
|
mtd->ecclayout = &docg3_oobinfo;
|
|
mtd->ecc_strength = DOC_ECC_BCH_T;
|
|
}
|
|
|
|
/**
|
|
* doc_probe_device - Check if a device is available
|
|
* @base: the io space where the device is probed
|
|
* @floor: the floor of the probed device
|
|
* @dev: the device
|
|
* @cascade: the cascade of chips this devices will belong to
|
|
*
|
|
* Checks whether a device at the specified IO range, and floor is available.
|
|
*
|
|
* Returns a mtd_info struct if there is a device, ENODEV if none found, ENOMEM
|
|
* if a memory allocation failed. If floor 0 is checked, a reset of the ASIC is
|
|
* launched.
|
|
*/
|
|
static struct mtd_info * __init
|
|
doc_probe_device(struct docg3_cascade *cascade, int floor, struct device *dev)
|
|
{
|
|
int ret, bbt_nbpages;
|
|
u16 chip_id, chip_id_inv;
|
|
struct docg3 *docg3;
|
|
struct mtd_info *mtd;
|
|
|
|
ret = -ENOMEM;
|
|
docg3 = kzalloc(sizeof(struct docg3), GFP_KERNEL);
|
|
if (!docg3)
|
|
goto nomem1;
|
|
mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
|
|
if (!mtd)
|
|
goto nomem2;
|
|
mtd->priv = docg3;
|
|
bbt_nbpages = DIV_ROUND_UP(docg3->max_block + 1,
|
|
8 * DOC_LAYOUT_PAGE_SIZE);
|
|
docg3->bbt = kzalloc(bbt_nbpages * DOC_LAYOUT_PAGE_SIZE, GFP_KERNEL);
|
|
if (!docg3->bbt)
|
|
goto nomem3;
|
|
|
|
docg3->dev = dev;
|
|
docg3->device_id = floor;
|
|
docg3->cascade = cascade;
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
if (!floor)
|
|
doc_set_asic_mode(docg3, DOC_ASICMODE_RESET);
|
|
doc_set_asic_mode(docg3, DOC_ASICMODE_NORMAL);
|
|
|
|
chip_id = doc_register_readw(docg3, DOC_CHIPID);
|
|
chip_id_inv = doc_register_readw(docg3, DOC_CHIPID_INV);
|
|
|
|
ret = 0;
|
|
if (chip_id != (u16)(~chip_id_inv)) {
|
|
goto nomem3;
|
|
}
|
|
|
|
switch (chip_id) {
|
|
case DOC_CHIPID_G3:
|
|
doc_info("Found a G3 DiskOnChip at addr %p, floor %d\n",
|
|
docg3->cascade->base, floor);
|
|
break;
|
|
default:
|
|
doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id);
|
|
goto nomem3;
|
|
}
|
|
|
|
doc_set_driver_info(chip_id, mtd);
|
|
|
|
doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ);
|
|
doc_reload_bbt(docg3);
|
|
return mtd;
|
|
|
|
nomem3:
|
|
kfree(mtd);
|
|
nomem2:
|
|
kfree(docg3);
|
|
nomem1:
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* doc_release_device - Release a docg3 floor
|
|
* @mtd: the device
|
|
*/
|
|
static void doc_release_device(struct mtd_info *mtd)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
|
|
mtd_device_unregister(mtd);
|
|
kfree(docg3->bbt);
|
|
kfree(docg3);
|
|
kfree(mtd->name);
|
|
kfree(mtd);
|
|
}
|
|
|
|
/**
|
|
* docg3_resume - Awakens docg3 floor
|
|
* @pdev: platfrom device
|
|
*
|
|
* Returns 0 (always successful)
|
|
*/
|
|
static int docg3_resume(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
struct docg3_cascade *cascade;
|
|
struct mtd_info **docg3_floors, *mtd;
|
|
struct docg3 *docg3;
|
|
|
|
cascade = platform_get_drvdata(pdev);
|
|
docg3_floors = cascade->floors;
|
|
mtd = docg3_floors[0];
|
|
docg3 = mtd->priv;
|
|
|
|
doc_dbg("docg3_resume()\n");
|
|
for (i = 0; i < 12; i++)
|
|
doc_readb(docg3, DOC_IOSPACE_IPL);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* docg3_suspend - Put in low power mode the docg3 floor
|
|
* @pdev: platform device
|
|
* @state: power state
|
|
*
|
|
* Shuts off most of docg3 circuitery to lower power consumption.
|
|
*
|
|
* Returns 0 if suspend succeeded, -EIO if chip refused suspend
|
|
*/
|
|
static int docg3_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
int floor, i;
|
|
struct docg3_cascade *cascade;
|
|
struct mtd_info **docg3_floors, *mtd;
|
|
struct docg3 *docg3;
|
|
u8 ctrl, pwr_down;
|
|
|
|
cascade = platform_get_drvdata(pdev);
|
|
docg3_floors = cascade->floors;
|
|
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
|
|
mtd = docg3_floors[floor];
|
|
if (!mtd)
|
|
continue;
|
|
docg3 = mtd->priv;
|
|
|
|
doc_writeb(docg3, floor, DOC_DEVICESELECT);
|
|
ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
|
|
ctrl &= ~DOC_CTRL_VIOLATION & ~DOC_CTRL_CE;
|
|
doc_writeb(docg3, ctrl, DOC_FLASHCONTROL);
|
|
|
|
for (i = 0; i < 10; i++) {
|
|
usleep_range(3000, 4000);
|
|
pwr_down = doc_register_readb(docg3, DOC_POWERMODE);
|
|
if (pwr_down & DOC_POWERDOWN_READY)
|
|
break;
|
|
}
|
|
if (pwr_down & DOC_POWERDOWN_READY) {
|
|
doc_dbg("docg3_suspend(): floor %d powerdown ok\n",
|
|
floor);
|
|
} else {
|
|
doc_err("docg3_suspend(): floor %d powerdown failed\n",
|
|
floor);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
mtd = docg3_floors[0];
|
|
docg3 = mtd->priv;
|
|
doc_set_asic_mode(docg3, DOC_ASICMODE_POWERDOWN);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* doc_probe - Probe the IO space for a DiskOnChip G3 chip
|
|
* @pdev: platform device
|
|
*
|
|
* Probes for a G3 chip at the specified IO space in the platform data
|
|
* ressources. The floor 0 must be available.
|
|
*
|
|
* Returns 0 on success, -ENOMEM, -ENXIO on error
|
|
*/
|
|
static int __init docg3_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct mtd_info *mtd;
|
|
struct resource *ress;
|
|
void __iomem *base;
|
|
int ret, floor, found = 0;
|
|
struct docg3_cascade *cascade;
|
|
|
|
ret = -ENXIO;
|
|
ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!ress) {
|
|
dev_err(dev, "No I/O memory resource defined\n");
|
|
goto noress;
|
|
}
|
|
base = ioremap(ress->start, DOC_IOSPACE_SIZE);
|
|
|
|
ret = -ENOMEM;
|
|
cascade = kzalloc(sizeof(*cascade) * DOC_MAX_NBFLOORS,
|
|
GFP_KERNEL);
|
|
if (!cascade)
|
|
goto nomem1;
|
|
cascade->base = base;
|
|
mutex_init(&cascade->lock);
|
|
cascade->bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T,
|
|
DOC_ECC_BCH_PRIMPOLY);
|
|
if (!cascade->bch)
|
|
goto nomem2;
|
|
|
|
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
|
|
mtd = doc_probe_device(cascade, floor, dev);
|
|
if (IS_ERR(mtd)) {
|
|
ret = PTR_ERR(mtd);
|
|
goto err_probe;
|
|
}
|
|
if (!mtd) {
|
|
if (floor == 0)
|
|
goto notfound;
|
|
else
|
|
continue;
|
|
}
|
|
cascade->floors[floor] = mtd;
|
|
ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL,
|
|
0);
|
|
if (ret)
|
|
goto err_probe;
|
|
found++;
|
|
}
|
|
|
|
ret = doc_register_sysfs(pdev, cascade);
|
|
if (ret)
|
|
goto err_probe;
|
|
if (!found)
|
|
goto notfound;
|
|
|
|
platform_set_drvdata(pdev, cascade);
|
|
doc_dbg_register(cascade->floors[0]->priv);
|
|
return 0;
|
|
|
|
notfound:
|
|
ret = -ENODEV;
|
|
dev_info(dev, "No supported DiskOnChip found\n");
|
|
err_probe:
|
|
kfree(cascade->bch);
|
|
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
|
|
if (cascade->floors[floor])
|
|
doc_release_device(cascade->floors[floor]);
|
|
nomem2:
|
|
kfree(cascade);
|
|
nomem1:
|
|
iounmap(base);
|
|
noress:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* docg3_release - Release the driver
|
|
* @pdev: the platform device
|
|
*
|
|
* Returns 0
|
|
*/
|
|
static int __exit docg3_release(struct platform_device *pdev)
|
|
{
|
|
struct docg3_cascade *cascade = platform_get_drvdata(pdev);
|
|
struct docg3 *docg3 = cascade->floors[0]->priv;
|
|
void __iomem *base = cascade->base;
|
|
int floor;
|
|
|
|
doc_unregister_sysfs(pdev, cascade);
|
|
doc_dbg_unregister(docg3);
|
|
for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
|
|
if (cascade->floors[floor])
|
|
doc_release_device(cascade->floors[floor]);
|
|
|
|
free_bch(docg3->cascade->bch);
|
|
kfree(cascade);
|
|
iounmap(base);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver g3_driver = {
|
|
.driver = {
|
|
.name = "docg3",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.suspend = docg3_suspend,
|
|
.resume = docg3_resume,
|
|
.remove = __exit_p(docg3_release),
|
|
};
|
|
|
|
module_platform_driver_probe(g3_driver, docg3_probe);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
|
|
MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");
|