From abb1cd00e6b7434e866f1f817b4994e1c7f1f16d Mon Sep 17 00:00:00 2001 From: Josh Wu Date: Sat, 11 Oct 2014 18:01:50 +0800 Subject: [PATCH] mtd: atmel_nand: make PMECC lookup table and offset property optional If there is no PMECC lookup table stored in ROM, or lookup table offset is not specified, PMECC driver should build it in DDR by itself. That make the PMECC driver work for some board which doesn't have PMECC lookup table in ROM. The PMECC use the BCH algorithm, so based on the build_gf_tables() function in lib/bch.c, we can build the Galois Field lookup table. For more information can refer to section 5.4 of PMECC controller application note: http://www.atmel.com/images/doc11127.pdf Signed-off-by: Josh Wu Cc: devicetree@vger.kernel.org Signed-off-by: Brian Norris --- .../devicetree/bindings/mtd/atmel-nand.txt | 6 +- drivers/mtd/nand/atmel_nand.c | 81 ++++++++++++++++++++-- drivers/mtd/nand/atmel_nand_ecc.h | 4 ++ 3 files changed, 85 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt index 6edc3b6..1fe6dde 100644 --- a/Documentation/devicetree/bindings/mtd/atmel-nand.txt +++ b/Documentation/devicetree/bindings/mtd/atmel-nand.txt @@ -5,7 +5,9 @@ Required properties: - reg : should specify localbus address and size used for the chip, and hardware ECC controller if available. If the hardware ECC is PMECC, it should contain address and size for - PMECC, PMECC Error Location controller and ROM which has lookup tables. + PMECC and PMECC Error Location controller. + The PMECC lookup table address and size in ROM is optional. If not + specified, driver will build it in runtime. - atmel,nand-addr-offset : offset for the address latch. - atmel,nand-cmd-offset : offset for the command latch. - #address-cells, #size-cells : Must be present if the device has sub-nodes @@ -27,7 +29,7 @@ Optional properties: are: 512, 1024. - atmel,pmecc-lookup-table-offset : includes two offsets of lookup table in ROM for different sector size. First one is for sector size 512, the next is for - sector size 1024. + sector size 1024. If not specified, driver will build the table in runtime. - nand-bus-width : 8 or 16 bus width if not present 8 - nand-on-flash-bbt: boolean to enable on flash bbt option if not present false - Nand Flash Controller(NFC) is a slave driver under Atmel nand flash diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index 19d1e9d..5c1423a2 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -127,6 +127,7 @@ struct atmel_nand_host { bool has_pmecc; u8 pmecc_corr_cap; u16 pmecc_sector_size; + bool has_no_lookup_table; u32 pmecc_lookup_table_offset; u32 pmecc_lookup_table_offset_512; u32 pmecc_lookup_table_offset_1024; @@ -1112,12 +1113,66 @@ static int pmecc_choose_ecc(struct atmel_nand_host *host, return 0; } +static inline int deg(unsigned int poly) +{ + /* polynomial degree is the most-significant bit index */ + return fls(poly) - 1; +} + +static int build_gf_tables(int mm, unsigned int poly, + int16_t *index_of, int16_t *alpha_to) +{ + unsigned int i, x = 1; + const unsigned int k = 1 << deg(poly); + unsigned int nn = (1 << mm) - 1; + + /* primitive polynomial must be of degree m */ + if (k != (1u << mm)) + return -EINVAL; + + for (i = 0; i < nn; i++) { + alpha_to[i] = x; + index_of[x] = i; + if (i && (x == 1)) + /* polynomial is not primitive (a^i=1 with 0mtd; struct nand_chip *nand_chip = &host->nand_chip; struct resource *regs, *regs_pmerr, *regs_rom; + uint16_t *galois_table; int cap, sector_size, err_no; err_no = pmecc_choose_ecc(host, &cap, §or_size); @@ -1163,8 +1218,24 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev, regs_rom = platform_get_resource(pdev, IORESOURCE_MEM, 3); host->pmecc_rom_base = devm_ioremap_resource(&pdev->dev, regs_rom); if (IS_ERR(host->pmecc_rom_base)) { - err_no = PTR_ERR(host->pmecc_rom_base); - goto err; + if (!host->has_no_lookup_table) + /* Don't display the information again */ + dev_err(host->dev, "Can not get I/O resource for ROM, will build a lookup table in runtime!\n"); + + host->has_no_lookup_table = true; + } + + if (host->has_no_lookup_table) { + /* Build the look-up table in runtime */ + galois_table = create_lookup_table(host->dev, sector_size); + if (!galois_table) { + dev_err(host->dev, "Failed to build a lookup table in runtime!\n"); + err_no = -EINVAL; + goto err; + } + + host->pmecc_rom_base = (void __iomem *)galois_table; + host->pmecc_lookup_table_offset = 0; } nand_chip->ecc.size = sector_size; @@ -1501,8 +1572,10 @@ static int atmel_of_init_port(struct atmel_nand_host *host, if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset", offset, 2) != 0) { - dev_err(host->dev, "Cannot get PMECC lookup table offset\n"); - return -EINVAL; + dev_err(host->dev, "Cannot get PMECC lookup table offset, will build a lookup table in runtime.\n"); + host->has_no_lookup_table = true; + /* Will build a lookup table and initialize the offset later */ + return 0; } if (!offset[0] && !offset[1]) { dev_err(host->dev, "Invalid PMECC lookup table offset\n"); diff --git a/drivers/mtd/nand/atmel_nand_ecc.h b/drivers/mtd/nand/atmel_nand_ecc.h index 8a1e9a6..d4035e3 100644 --- a/drivers/mtd/nand/atmel_nand_ecc.h +++ b/drivers/mtd/nand/atmel_nand_ecc.h @@ -142,6 +142,10 @@ #define PMECC_GF_DIMENSION_13 13 #define PMECC_GF_DIMENSION_14 14 +/* Primitive Polynomial used by PMECC */ +#define PMECC_GF_13_PRIMITIVE_POLY 0x201b +#define PMECC_GF_14_PRIMITIVE_POLY 0x4443 + #define PMECC_LOOKUP_TABLE_SIZE_512 0x2000 #define PMECC_LOOKUP_TABLE_SIZE_1024 0x4000 -- 2.7.4