[PATCH v8 2/3] MTD: add dt parameters for PMECC
Josh Wu
josh.wu at atmel.com
Wed May 23 03:47:53 EDT 2012
Signed-off-by: Hong Xu <hong.xu at atmel.com>
Signed-off-by: Josh Wu <josh.wu at atmel.com>
---
.../devicetree/bindings/mtd/atmel-nand.txt | 7 +++++++
drivers/mtd/nand/atmel_nand.c | 20 ++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/Documentation/devicetree/bindings/mtd/atmel-nand.txt b/Documentation/devicetree/bindings/mtd/atmel-nand.txt
index a200695..895d72b 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,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 52ca295..937b080 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 correction_cap;
+ u16 sector_size;
};
static int cpu_has_dma(void)
@@ -508,6 +512,22 @@ 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) {
+ if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) {
+ dev_err(host->dev, "Cannot decide PMECC Capability\n");
+ return -EINVAL;
+ }
+ host->correction_cap = (u8)val;
+
+ if (of_property_read_u32(np, "atmel,sector-size", &val) != 0) {
+ dev_err(host->dev, "Cannot decide PMECC Sector Size\n");
+ return -EINVAL;
+ }
+ host->sector_size = (u16)val;
+ }
+
return 0;
}
#else
--
1.7.10
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