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[MTD] Renesas AG-AND device recovery

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Add routine to perform device recovery (deplete) procedure.
Clean up some compiler warnings.

Signed-off-by: David A. Marlin <dmarlin@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
David A. Marlin 2005-01-17 19:44:39 +00:00 committed by Thomas Gleixner
parent 30f464b74b
commit 97f1a087dc
1 changed files with 44 additions and 4 deletions
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48
drivers/mtd/nand/rtc_from4.c
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@ -6,7 +6,7 @@
* Derived from drivers/mtd/nand/spia.c * Derived from drivers/mtd/nand/spia.c
* Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com) * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
* *
* $Id: rtc_from4.c,v 1.7 2004/11/04 12:53:10 gleixner Exp $ * $Id: rtc_from4.c,v 1.8 2005/01/17 19:44:36 dmarlin Exp $
* *
* This program is free software; you can redistribute it and/or modify * This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as * it under the terms of the GNU General Public License version 2 as
@ -89,7 +89,7 @@ static struct mtd_info *rtc_from4_mtd = NULL;
/* /*
* Module stuff * Module stuff
*/ */
static void __iomem *rtc_from4_fio_base = P2SEGADDR(RTC_FROM4_FIO_BASE); static void __iomem *rtc_from4_fio_base = (void *)P2SEGADDR(RTC_FROM4_FIO_BASE);
const static struct mtd_partition partition_info[] = { const static struct mtd_partition partition_info[] = {
{ {
@ -286,6 +286,40 @@ static int rtc_from4_nand_device_ready(struct mtd_info *mtd)
} }
/*
* deplete - code to perform device recovery in case there was a power loss
* @mtd: MTD device structure
* @chip: Chip to select (0 == slot 3, 1 == slot 4)
*
* If there was a sudden loss of power during an erase operation, a
* "device recovery" operation must be performed when power is restored
* to ensure correct operation. This routine performs the required steps
* for the requested chip.
*
* See page 86 of the data sheet for details.
*
*/
static void deplete(struct mtd_info *mtd, int chip)
{
struct nand_chip *this = mtd->priv;
/* wait until device is ready */
while (!this->dev_ready(mtd));
this->select_chip(mtd, chip);
/* Send the commands for device recovery, phase 1 */
this->cmdfunc (mtd, NAND_CMD_DEPLETE1, 0x0000, 0x0000);
this->cmdfunc (mtd, NAND_CMD_DEPLETE2, -1, -1);
/* Send the commands for device recovery, phase 2 */
this->cmdfunc (mtd, NAND_CMD_DEPLETE1, 0x0000, 0x0004);
this->cmdfunc (mtd, NAND_CMD_DEPLETE2, -1, -1);
}
#ifdef RTC_FROM4_HWECC #ifdef RTC_FROM4_HWECC
/* /*
* rtc_from4_enable_hwecc - hardware specific hardware ECC enable function * rtc_from4_enable_hwecc - hardware specific hardware ECC enable function
@ -374,7 +408,7 @@ static int rtc_from4_correct_data(struct mtd_info *mtd, const u_char *buf, u_cha
{ {
int i, j, res; int i, j, res;
unsigned short status; unsigned short status;
uint16_t par[6], syn[6], tmp; uint16_t par[6], syn[6];
uint8_t ecc[8]; uint8_t ecc[8];
volatile unsigned short *rs_ecc; volatile unsigned short *rs_ecc;
@ -416,7 +450,7 @@ static int rtc_from4_correct_data(struct mtd_info *mtd, const u_char *buf, u_cha
} }
/* Let the library code do its magic.*/ /* Let the library code do its magic.*/
res = decode_rs8(rs_decoder, buf, par, 512, syn, 0, NULL, 0xff, NULL); res = decode_rs8(rs_decoder, (uint8_t *)buf, par, 512, syn, 0, NULL, 0xff, NULL);
if (res > 0) { if (res > 0) {
DEBUG (MTD_DEBUG_LEVEL0, "rtc_from4_correct_data: " DEBUG (MTD_DEBUG_LEVEL0, "rtc_from4_correct_data: "
"ECC corrected %d errors on read\n", res); "ECC corrected %d errors on read\n", res);
@ -432,6 +466,7 @@ int __init rtc_from4_init (void)
{ {
struct nand_chip *this; struct nand_chip *this;
unsigned short bcr1, bcr2, wcr2; unsigned short bcr1, bcr2, wcr2;
int i;
/* Allocate memory for MTD device structure and private data */ /* Allocate memory for MTD device structure and private data */
rtc_from4_mtd = kmalloc(sizeof(struct mtd_info) + sizeof (struct nand_chip), rtc_from4_mtd = kmalloc(sizeof(struct mtd_info) + sizeof (struct nand_chip),
@ -504,6 +539,11 @@ int __init rtc_from4_init (void)
return -ENXIO; return -ENXIO;
} }
/* Perform 'device recovery' for each chip in case there was a power loss. */
for (i=0; i < this->numchips; i++) {
deplete(rtc_from4_mtd, i);
}
/* Register the partitions */ /* Register the partitions */
add_mtd_partitions(rtc_from4_mtd, partition_info, NUM_PARTITIONS); add_mtd_partitions(rtc_from4_mtd, partition_info, NUM_PARTITIONS);