1115 lines
30 KiB
C
1115 lines
30 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/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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* - block erase
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* - page write
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* - IPL write
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* - ECC fixing (lack of BCH algorith understanding)
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* - powerdown / powerup
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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 part is only used for check purpose, no correction is available as
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* some information is missing. What is known is that :
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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 inline u8 doc_readb(struct docg3 *docg3, u16 reg)
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{
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u8 val = readb(docg3->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->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->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_writew(struct docg3 *docg3, u16 val, u16 reg)
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{
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writew(val, docg3->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 *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_dbg("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
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* @len: the lenght 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 & 0x3;
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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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*dst16 = data16;
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dst16++;
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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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*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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* doc_set_data_mode - Sets the flash to 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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static void doc_set_reliable_mode(struct docg3 *docg3)
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{
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doc_dbg("doc_set_reliable_mode()\n");
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doc_flash_sequence(docg3, DOC_SEQ_SET_MODE);
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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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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 occured, -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_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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sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
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doc_flash_sequence(docg3, DOC_SEQ_READ);
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doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
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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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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_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, 2);
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out:
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return ret;
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}
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/**
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* doc_read_page_ecc_init - Initialize hardware ECC engine
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* @docg3: the device
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* @len: the number of bytes covered by the ECC (BCH covered)
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*
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* The function does initialize the hardware ECC engine to compute the Hamming
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* ECC (on 1 byte) and the BCH Syndroms (on 7 bytes).
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*
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* Return 0 if succeeded, -EIO on error
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*/
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static int doc_read_page_ecc_init(struct docg3 *docg3, int len)
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{
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doc_writew(docg3, DOC_ECCCONF0_READ_MODE
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| DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE
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| (len & DOC_ECCCONF0_DATA_BYTES_MASK),
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DOC_ECCCONF0);
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doc_delay(docg3, 4);
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doc_register_readb(docg3, DOC_FLASHCONTROL);
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return doc_wait_ready(docg3);
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}
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|
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/**
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* doc_read_page_prepare - Prepares reading data from a flash page
|
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* @docg3: the device
|
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* @block0: the first plane block index on flash memory
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* @block1: the second plane block index on flash memory
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* @page: the page index in the block
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* @offset: the offset in the page (must be a multiple of 4)
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*
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* Prepares the page to be read in the flash memory :
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* - tell ASIC to map the flash pages
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* - tell ASIC to be in read mode
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*
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* After a call to this method, a call to doc_read_page_finish is mandatory,
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* to end the read cycle of the flash.
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*
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* Read data from a flash page. The length to be read must be between 0 and
|
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* (page_size + oob_size + wear_size), ie. 532, and a multiple of 4 (because
|
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* the extra bytes reading is not implemented).
|
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*
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* As pages are grouped by 2 (in 2 planes), reading from a page must be done
|
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* in two steps:
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* - one read of 512 bytes at offset 0
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* - one read of 512 bytes at offset 512 + 16
|
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*
|
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* Returns 0 if successful, -EIO if a read error occured.
|
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*/
|
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static int doc_read_page_prepare(struct docg3 *docg3, int block0, int block1,
|
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int page, int offset)
|
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{
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int wear_area = 0, ret = 0;
|
|
|
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doc_dbg("doc_read_page_prepare(blocks=(%d,%d), page=%d, ofsInPage=%d)\n",
|
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block0, block1, page, offset);
|
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if (offset >= DOC_LAYOUT_WEAR_OFFSET)
|
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wear_area = 1;
|
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if (!wear_area && offset > (DOC_LAYOUT_PAGE_OOB_SIZE * 2))
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return -EINVAL;
|
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|
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doc_set_device_id(docg3, docg3->device_id);
|
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ret = doc_reset_seq(docg3);
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if (ret)
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goto err;
|
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|
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/* Program the flash address block and page */
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ret = doc_read_seek(docg3, block0, block1, page, wear_area, offset);
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if (ret)
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goto err;
|
|
|
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doc_flash_command(docg3, DOC_CMD_READ_ALL_PLANES);
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doc_delay(docg3, 2);
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doc_wait_ready(docg3);
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|
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doc_flash_command(docg3, DOC_CMD_SET_ADDR_READ);
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doc_delay(docg3, 1);
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if (offset >= DOC_LAYOUT_PAGE_SIZE * 2)
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offset -= 2 * DOC_LAYOUT_PAGE_SIZE;
|
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doc_flash_address(docg3, offset >> 2);
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doc_delay(docg3, 1);
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doc_wait_ready(docg3);
|
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|
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doc_flash_command(docg3, DOC_CMD_READ_FLASH);
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|
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return 0;
|
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err:
|
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doc_writeb(docg3, 0, DOC_DATAEND);
|
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doc_delay(docg3, 2);
|
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return -EIO;
|
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}
|
|
|
|
/**
|
|
* doc_read_page_getbytes - Reads bytes from a prepared page
|
|
* @docg3: the device
|
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* @len: the number of bytes to be read (must be a multiple of 4)
|
|
* @buf: the buffer to be filled in
|
|
* @first: 1 if first time read, DOC_READADDRESS should be set
|
|
*
|
|
*/
|
|
static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
|
|
int first)
|
|
{
|
|
doc_read_data_area(docg3, buf, len, first);
|
|
doc_delay(docg3, 2);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* doc_get_hw_bch_syndroms - Get hardware calculated BCH syndroms
|
|
* @docg3: the device
|
|
* @syns: the array of 7 integers where the syndroms will be stored
|
|
*/
|
|
static void doc_get_hw_bch_syndroms(struct docg3 *docg3, int *syns)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
|
|
syns[i] = doc_register_readb(docg3, DOC_BCH_SYNDROM(i));
|
|
}
|
|
|
|
/**
|
|
* 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_writeb(docg3, 0, DOC_DATAEND);
|
|
doc_delay(docg3, 2);
|
|
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
|
|
*/
|
|
static void calc_block_sector(loff_t from, int *block0, int *block1, int *page,
|
|
int *ofs)
|
|
{
|
|
uint sector;
|
|
|
|
sector = from / DOC_LAYOUT_PAGE_SIZE;
|
|
*block0 = sector / (DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES)
|
|
* DOC_LAYOUT_NBPLANES;
|
|
*block1 = *block0 + 1;
|
|
*page = sector % (DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES);
|
|
*page /= DOC_LAYOUT_NBPLANES;
|
|
if (sector % 2)
|
|
*ofs = DOC_LAYOUT_PAGE_OOB_SIZE;
|
|
else
|
|
*ofs = 0;
|
|
}
|
|
|
|
/**
|
|
* 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 successfull, of -EIO, -EINVAL if an error occured
|
|
*/
|
|
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
struct docg3 *docg3 = mtd->priv;
|
|
int block0, block1, page, readlen, ret, ofs = 0;
|
|
int syn[DOC_ECC_BCH_SIZE], eccconf1;
|
|
u8 oob[DOC_LAYOUT_OOB_SIZE];
|
|
|
|
ret = -EINVAL;
|
|
doc_dbg("doc_read(from=%lld, len=%zu, buf=%p)\n", from, len, buf);
|
|
if (from % DOC_LAYOUT_PAGE_SIZE)
|
|
goto err;
|
|
if (len % 4)
|
|
goto err;
|
|
calc_block_sector(from, &block0, &block1, &page, &ofs);
|
|
if (block1 > docg3->max_block)
|
|
goto err;
|
|
|
|
*retlen = 0;
|
|
ret = 0;
|
|
readlen = min_t(size_t, len, (size_t)DOC_LAYOUT_PAGE_SIZE);
|
|
while (!ret && len > 0) {
|
|
readlen = min_t(size_t, len, (size_t)DOC_LAYOUT_PAGE_SIZE);
|
|
ret = doc_read_page_prepare(docg3, block0, block1, page, ofs);
|
|
if (ret < 0)
|
|
goto err;
|
|
ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_COVERED_BYTES);
|
|
if (ret < 0)
|
|
goto err_in_read;
|
|
ret = doc_read_page_getbytes(docg3, readlen, buf, 1);
|
|
if (ret < readlen)
|
|
goto err_in_read;
|
|
ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE,
|
|
oob, 0);
|
|
if (ret < DOC_LAYOUT_OOB_SIZE)
|
|
goto err_in_read;
|
|
|
|
*retlen += readlen;
|
|
buf += readlen;
|
|
len -= readlen;
|
|
|
|
ofs ^= DOC_LAYOUT_PAGE_OOB_SIZE;
|
|
if (ofs == 0)
|
|
page += 2;
|
|
if (page > DOC_ADDR_PAGE_MASK) {
|
|
page = 0;
|
|
block0 += 2;
|
|
block1 += 2;
|
|
}
|
|
|
|
/*
|
|
* There should be a BCH bitstream fixing algorithm here ...
|
|
* By now, a page read failure is triggered by BCH error
|
|
*/
|
|
doc_get_hw_bch_syndroms(docg3, syn);
|
|
eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1);
|
|
|
|
doc_dbg("OOB - INFO: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
oob[0], oob[1], oob[2], oob[3], oob[4],
|
|
oob[5], oob[6]);
|
|
doc_dbg("OOB - HAMMING: %02x\n", oob[7]);
|
|
doc_dbg("OOB - BCH_ECC: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
oob[8], oob[9], oob[10], oob[11], oob[12],
|
|
oob[13], oob[14]);
|
|
doc_dbg("OOB - UNUSED: %02x\n", oob[15]);
|
|
doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1);
|
|
doc_dbg("ECC BCH syndrom: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
|
|
syn[0], syn[1], syn[2], syn[3], syn[4], syn[5], syn[6]);
|
|
|
|
ret = -EBADMSG;
|
|
if (block0 >= DOC_LAYOUT_BLOCK_FIRST_DATA) {
|
|
if (eccconf1 & DOC_ECCCONF1_BCH_SYNDROM_ERR)
|
|
goto err_in_read;
|
|
if (is_prot_seq_error(docg3))
|
|
goto err_in_read;
|
|
}
|
|
doc_read_page_finish(docg3);
|
|
}
|
|
|
|
return 0;
|
|
err_in_read:
|
|
doc_read_page_finish(docg3);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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 successfull, of -EIO, -EINVAL if an error occured
|
|
*/
|
|
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, ofs, ret;
|
|
u8 *buf = ops->oobbuf;
|
|
size_t len = ops->ooblen;
|
|
|
|
doc_dbg("doc_read_oob(from=%lld, buf=%p, len=%zu)\n", from, buf, len);
|
|
if (len != DOC_LAYOUT_OOB_SIZE)
|
|
return -EINVAL;
|
|
|
|
switch (ops->mode) {
|
|
case MTD_OPS_PLACE_OOB:
|
|
buf += ops->ooboffs;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
calc_block_sector(from, &block0, &block1, &page, &ofs);
|
|
if (block1 > docg3->max_block)
|
|
return -EINVAL;
|
|
|
|
ret = doc_read_page_prepare(docg3, block0, block1, page,
|
|
ofs + DOC_LAYOUT_PAGE_SIZE);
|
|
if (!ret)
|
|
ret = doc_read_page_ecc_init(docg3, DOC_LAYOUT_OOB_SIZE);
|
|
if (!ret)
|
|
ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE,
|
|
buf, 1);
|
|
doc_read_page_finish(docg3);
|
|
|
|
if (ret > 0)
|
|
ops->oobretlen = ret;
|
|
else
|
|
ops->oobretlen = 0;
|
|
return (ret > 0) ? 0 : 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);
|
|
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);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
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);
|
|
if (!ret)
|
|
ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE,
|
|
buf, 1);
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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 = doc_register_readb(docg3, DOC_FLASHCONTROL);
|
|
|
|
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;
|
|
int pctrl = doc_register_readb(docg3, DOC_ASICMODE);
|
|
int mode = pctrl & 0x03;
|
|
|
|
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 = doc_register_readb(docg3, DOC_DEVICESELECT);
|
|
|
|
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 = doc_register_readb(docg3, DOC_PROTECTION);
|
|
int dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
|
|
int dps0_low = doc_register_readb(docg3, DOC_DPS0_ADDRLOW);
|
|
int dps0_high = doc_register_readb(docg3, DOC_DPS0_ADDRHIGH);
|
|
int dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
|
|
int dps1_low = doc_register_readb(docg3, DOC_DPS1_ADDRLOW);
|
|
int dps1_high = doc_register_readb(docg3, DOC_DPS1_ADDRHIGH);
|
|
|
|
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);
|
|
|
|
switch (chip_id) {
|
|
case DOC_CHIPID_G3:
|
|
mtd->name = "DiskOnChip G3";
|
|
docg3->max_block = 2047;
|
|
break;
|
|
}
|
|
mtd->type = MTD_NANDFLASH;
|
|
/*
|
|
* Once write methods are added, the correct flags will be set.
|
|
* mtd->flags = MTD_CAP_NANDFLASH;
|
|
*/
|
|
mtd->flags = MTD_CAP_ROM;
|
|
mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE;
|
|
mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES;
|
|
mtd->writesize = DOC_LAYOUT_PAGE_SIZE;
|
|
mtd->oobsize = DOC_LAYOUT_OOB_SIZE;
|
|
mtd->owner = THIS_MODULE;
|
|
mtd->erase = NULL;
|
|
mtd->point = NULL;
|
|
mtd->unpoint = NULL;
|
|
mtd->read = doc_read;
|
|
mtd->write = NULL;
|
|
mtd->read_oob = doc_read_oob;
|
|
mtd->write_oob = NULL;
|
|
mtd->sync = NULL;
|
|
mtd->block_isbad = doc_block_isbad;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns 0 on success, -ENOMEM, -ENXIO on error
|
|
*/
|
|
static int __init docg3_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct docg3 *docg3;
|
|
struct mtd_info *mtd;
|
|
struct resource *ress;
|
|
int ret, bbt_nbpages;
|
|
u16 chip_id, chip_id_inv;
|
|
|
|
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;
|
|
|
|
ret = -ENXIO;
|
|
ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!ress) {
|
|
dev_err(dev, "No I/O memory resource defined\n");
|
|
goto noress;
|
|
}
|
|
docg3->base = ioremap(ress->start, DOC_IOSPACE_SIZE);
|
|
|
|
docg3->dev = &pdev->dev;
|
|
docg3->device_id = 0;
|
|
doc_set_device_id(docg3, docg3->device_id);
|
|
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 = -ENODEV;
|
|
if (chip_id != (u16)(~chip_id_inv)) {
|
|
doc_info("No device found at IO addr %p\n",
|
|
(void *)ress->start);
|
|
goto nochipfound;
|
|
}
|
|
|
|
switch (chip_id) {
|
|
case DOC_CHIPID_G3:
|
|
doc_info("Found a G3 DiskOnChip at addr %p\n",
|
|
(void *)ress->start);
|
|
break;
|
|
default:
|
|
doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id);
|
|
goto nochipfound;
|
|
}
|
|
|
|
doc_set_driver_info(chip_id, mtd);
|
|
platform_set_drvdata(pdev, mtd);
|
|
|
|
ret = -ENOMEM;
|
|
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 nochipfound;
|
|
doc_reload_bbt(docg3);
|
|
|
|
ret = mtd_device_parse_register(mtd, part_probes,
|
|
NULL, NULL, 0);
|
|
if (ret)
|
|
goto register_error;
|
|
|
|
doc_dbg_register(docg3);
|
|
return 0;
|
|
|
|
register_error:
|
|
kfree(docg3->bbt);
|
|
nochipfound:
|
|
iounmap(docg3->base);
|
|
noress:
|
|
kfree(mtd);
|
|
nomem2:
|
|
kfree(docg3);
|
|
nomem1:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* docg3_release - Release the driver
|
|
* @pdev: the platform device
|
|
*
|
|
* Returns 0
|
|
*/
|
|
static int __exit docg3_release(struct platform_device *pdev)
|
|
{
|
|
struct mtd_info *mtd = platform_get_drvdata(pdev);
|
|
struct docg3 *docg3 = mtd->priv;
|
|
|
|
doc_dbg_unregister(docg3);
|
|
mtd_device_unregister(mtd);
|
|
iounmap(docg3->base);
|
|
kfree(docg3->bbt);
|
|
kfree(docg3);
|
|
kfree(mtd);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver g3_driver = {
|
|
.driver = {
|
|
.name = "docg3",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.remove = __exit_p(docg3_release),
|
|
};
|
|
|
|
static int __init docg3_init(void)
|
|
{
|
|
return platform_driver_probe(&g3_driver, docg3_probe);
|
|
}
|
|
module_init(docg3_init);
|
|
|
|
|
|
static void __exit docg3_exit(void)
|
|
{
|
|
platform_driver_unregister(&g3_driver);
|
|
}
|
|
module_exit(docg3_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
|
|
MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");
|