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path: root/drivers/mtd/nand/rtc_from4.c
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Diffstat (limited to 'drivers/mtd/nand/rtc_from4.c')
-rw-r--r--drivers/mtd/nand/rtc_from4.c48
1 files changed, 44 insertions, 4 deletions
diff --git a/drivers/mtd/nand/rtc_from4.c b/drivers/mtd/nand/rtc_from4.c
index 02305a2adca..a4d8d2e62e9 100644
--- a/drivers/mtd/nand/rtc_from4.c
+++ b/drivers/mtd/nand/rtc_from4.c
@@ -6,7 +6,7 @@
* Derived from drivers/mtd/nand/spia.c
* 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
* 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
*/
-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[] = {
{
@@ -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
/*
* 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;
unsigned short status;
- uint16_t par[6], syn[6], tmp;
+ uint16_t par[6], syn[6];
uint8_t ecc[8];
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.*/
- 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) {
DEBUG (MTD_DEBUG_LEVEL0, "rtc_from4_correct_data: "
"ECC corrected %d errors on read\n", res);
@@ -432,6 +466,7 @@ int __init rtc_from4_init (void)
{
struct nand_chip *this;
unsigned short bcr1, bcr2, wcr2;
+ int i;
/* Allocate memory for MTD device structure and private data */
rtc_from4_mtd = kmalloc(sizeof(struct mtd_info) + sizeof (struct nand_chip),
@@ -504,6 +539,11 @@ int __init rtc_from4_init (void)
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 */
add_mtd_partitions(rtc_from4_mtd, partition_info, NUM_PARTITIONS);