diff options
| -rw-r--r-- | drivers/mtd/nand/denali.c | 87 | ||||
| -rw-r--r-- | 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 a60f3f0186b..f20d1b14ea1 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -355,17 +355,6 @@ 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) { @@ -577,8 +566,6 @@ 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); @@ -1451,6 +1438,13 @@ 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); @@ -1465,29 +1459,18 @@ 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' }; @@ -1706,14 +1689,38 @@ 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 fcac24199d1..bdf5c2af500 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_*/ |