[PATCH v1 3/4]mtd: denali: Remove set_ecc_config function
Chuanxiao.Dong
chuanxiao.dong at intel.com
Fri Aug 6 06:49:06 EDT 2010
From 397bc9a8e7f007343c28c301dc4bf2f7f0174cf5 Mon Sep 17 00:00:00 2001
From: Chuanxiao Dong <chuanxiao.dong at intel.com>
Date: Fri, 6 Aug 2010 18:02:03 +0800
Subject: [PATCH 3/4] mtd: denali: Remove set_ecc_config function
set_ecc_config function only set ECC_CORRECTION register, so
move register setting to probe function.
Since controller only support 15bit and 8bit ecc correction,
updated nand ecc layout information.
Signed-off-by: Chuanxiao Dong <chuanxiao.dong at intel.com>
---
drivers/mtd/nand/denali.c | 87 ++++++++++++++++++++++++--------------------
drivers/mtd/nand/denali.h | 1 +
2 files changed, 48 insertions(+), 40 deletions(-)
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index e67a9d3..d486c0e 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -354,17 +354,6 @@ static void nand_onfi_timing_set(struct denali_nand_info *denali,
denali_write32(cs_cnt, denali->flash_reg + CS_SETUP_CNT);
}
-/* configures the initial ECC settings for the controller */
-static void set_ecc_config(struct denali_nand_info *denali)
-{
-#if SUPPORT_8BITECC
- if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) < 4096) ||
- (ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) <= 128))
- denali_write32(8, denali->flash_reg + ECC_CORRECTION);
-#endif
-
-}
-
/* queries the NAND device to see what ONFI modes it supports. */
static uint16_t get_onfi_nand_para(struct denali_nand_info *denali)
{
@@ -576,8 +565,6 @@ static uint16_t denali_nand_timing_set(struct denali_nand_info *denali)
ioread32(denali->flash_reg + RDWR_EN_HI_CNT),
ioread32(denali->flash_reg + CS_SETUP_CNT));
- set_ecc_config(denali);
-
find_valid_banks(denali);
detect_partition_feature(denali);
@@ -1450,6 +1437,13 @@ static void denali_ecc_hwctl(struct mtd_info *mtd, int mode)
/* Initialization code to bring the device up to a known good state */
static void denali_hw_init(struct denali_nand_info *denali)
{
+ /* tell driver how many bit controller will skip before
+ * writing ECC code in OOB, this register may be already
+ * set by firmware. So we read this value out.
+ * if this value is 0, just let it be.
+ * */
+ denali->bbtskipbytes = ioread32(denali->flash_reg +
+ SPARE_AREA_SKIP_BYTES);
denali_irq_init(denali);
denali_nand_reset(denali);
denali_write32(0x0F, denali->flash_reg + RB_PIN_ENABLED);
@@ -1464,29 +1458,18 @@ static void denali_hw_init(struct denali_nand_info *denali)
denali_write32(1, denali->flash_reg + ECC_ENABLE);
}
-/* ECC layout for SLC devices. Denali spec indicates SLC fixed at 4 bytes */
-#define ECC_BYTES_SLC (4 * (2048 / ECC_SECTOR_SIZE))
-static struct nand_ecclayout nand_oob_slc = {
- .eccbytes = 4,
- .eccpos = { 0, 1, 2, 3 }, /* not used */
- .oobfree = {
- {
- .offset = ECC_BYTES_SLC,
- .length = 64 - ECC_BYTES_SLC
- }
- }
+/* Althogh controller spec said SLC ECC is forceb to be 4bit,
+ * but denali controller in MRST only support 15bit and 8bit ECC
+ * correction
+ * */
+#define ECC_8BITS 14
+static struct nand_ecclayout nand_8bit_oob = {
+ .eccbytes = 14,
};
-#define ECC_BYTES_MLC (14 * (2048 / ECC_SECTOR_SIZE))
-static struct nand_ecclayout nand_oob_mlc_14bit = {
- .eccbytes = 14,
- .eccpos = { 0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13 }, /* not used */
- .oobfree = {
- {
- .offset = ECC_BYTES_MLC,
- .length = 64 - ECC_BYTES_MLC
- }
- }
+#define ECC_15BITS 26
+static struct nand_ecclayout nand_15bit_oob = {
+ .eccbytes = 26,
};
static uint8_t bbt_pattern[] = {'B', 'b', 't', '0' };
@@ -1705,14 +1688,38 @@ static int denali_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
denali->nand.options |= NAND_USE_FLASH_BBT | NAND_SKIP_BBTSCAN;
denali->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
- if (denali->nand.cellinfo & 0xc) {
- denali->nand.ecc.layout = &nand_oob_mlc_14bit;
- denali->nand.ecc.bytes = ECC_BYTES_MLC;
- } else {/* SLC */
- denali->nand.ecc.layout = &nand_oob_slc;
- denali->nand.ecc.bytes = ECC_BYTES_SLC;
+ /* Denali Controller only support 15bit and 8bit ECC in MRST,
+ * so just let controller do 15bit ECC for MLC and 8bit ECC for
+ * SLC if possible.
+ * */
+ if (denali->nand.cellinfo & 0xc &&
+ (denali->mtd.oobsize > (denali->bbtskipbytes +
+ ECC_15BITS * (denali->mtd.writesize /
+ ECC_SECTOR_SIZE)))) {
+ /* if MLC OOB size is large enough, use 15bit ECC*/
+ denali->nand.ecc.layout = &nand_15bit_oob;
+ denali->nand.ecc.bytes = ECC_15BITS;
+ denali_write32(15, denali->flash_reg + ECC_CORRECTION);
+ } else if (denali->mtd.oobsize < (denali->bbtskipbytes +
+ ECC_8BITS * (denali->mtd.writesize /
+ ECC_SECTOR_SIZE))) {
+ printk(KERN_ERR "Your NAND chip OOB is not large enough to"
+ " contain 8bit ECC correction codes");
+ goto failed_nand;
+ } else {
+ denali->nand.ecc.layout = &nand_8bit_oob;
+ denali->nand.ecc.bytes = ECC_8BITS;
+ denali_write32(8, denali->flash_reg + ECC_CORRECTION);
}
+ denali->nand.ecc.layout->eccbytes *=
+ denali->mtd.writesize / ECC_SECTOR_SIZE;
+ denali->nand.ecc.layout->oobfree[0].offset =
+ denali->bbtskipbytes + denali->nand.ecc.layout->eccbytes;
+ denali->nand.ecc.layout->oobfree[0].length =
+ denali->mtd.oobsize - denali->nand.ecc.layout->eccbytes -
+ denali->bbtskipbytes;
+
/* Let driver know the total blocks number and
* how many blocks contained by each nand chip.
* blksperchip will help driver to know how many
diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h
index fcac241..bdf5c2a 100644
--- a/drivers/mtd/nand/denali.h
+++ b/drivers/mtd/nand/denali.h
@@ -767,6 +767,7 @@ struct denali_nand_info {
uint32_t fwblks; /* represent how many blocks FW used */
uint32_t totalblks;
uint32_t blksperchip;
+ uint32_t bbtskipbytes;
};
#endif /*_LLD_NAND_*/
--
1.6.6.1
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