From mboxrd@z Thu Jan 1 00:00:00 1970 From: josh.wu@atmel.com (Josh Wu) Date: Sat, 26 May 2012 21:24:36 +0800 Subject: [PATCH v9 2/3] MTD: at91: add dt parameters for PMECC In-Reply-To: <1338038677-6752-1-git-send-email-josh.wu@atmel.com> References: <1338038677-6752-1-git-send-email-josh.wu@atmel.com> Message-ID: <1338038677-6752-3-git-send-email-josh.wu@atmel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Signed-off-by: Hong Xu Signed-off-by: Josh Wu --- .../devicetree/bindings/mtd/atmel-nand.txt | 6 ++++++ drivers/mtd/nand/atmel_nand.c | 22 ++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt index a200695..e442236 100644 --- a/Documentation/devicetree/bindings/mtd/atmel-nand.txt +++ b/Documentation/devicetree/bindings/mtd/atmel-nand.txt @@ -16,6 +16,12 @@ Optional properties: - nand-ecc-mode : String, operation mode of the NAND ecc mode, soft by default. Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first", "soft_bch". +- atmel,has-pmecc : boolean to enable Programmable Multibit ECC hardware. + Only supported by at91sam9x5 or later sam9 product. +- atmel,pmecc-cap : error correct capability for Programmable Multibit ECC + Controller. Supported values are: 2, 4, 8, 12, 24. +- atmel,pmecc-sector-size : sector size for ECC computation. Supported values + are: 512, 1024. - 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 diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c index ba61153..9a9bfbf 100644 --- a/drivers/mtd/nand/atmel_nand.c +++ b/drivers/mtd/nand/atmel_nand.c @@ -88,6 +88,10 @@ struct atmel_nand_host { struct completion comp; struct dma_chan *dma_chan; + + bool has_pmecc; + u8 pmecc_corr_cap; + u16 pmecc_sector_size; }; static int cpu_has_dma(void) @@ -508,6 +512,24 @@ static int __devinit atmel_of_init_port(struct atmel_nand_host *host, board->enable_pin = of_get_gpio(np, 1); board->det_pin = of_get_gpio(np, 2); + host->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc"); + + if (!(board->ecc_mode == NAND_ECC_HW) || !host->has_pmecc) + return 0; + + /* Use PMECC */ + if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) { + dev_err(host->dev, "Cannot decide PMECC Capability\n"); + return -EINVAL; + } + host->pmecc_corr_cap = (u8)val; + + if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) != 0) { + dev_err(host->dev, "Cannot decide PMECC Sector Size\n"); + return -EINVAL; + } + host->pmecc_sector_size = (u16)val; + return 0; } #else -- 1.7.10