mtd: at91: add dt parameters for Atmel PMECC
Add DT support for PMECC parameters. Signed-off-by: Hong Xu <hong.xu@atmel.com> Signed-off-by: Josh Wu <josh.wu@atmel.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -3,7 +3,9 @@ Atmel NAND flash
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Required properties:
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- compatible : "atmel,at91rm9200-nand".
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- reg : should specify localbus address and size used for the chip,
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and if availlable the ECC.
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and hardware ECC controller if available.
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If the hardware ECC is PMECC, it should contain address and size for
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PMECC, PMECC Error Location controller and ROM which has lookup tables.
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- atmel,nand-addr-offset : offset for the address latch.
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- atmel,nand-cmd-offset : offset for the command latch.
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- #address-cells, #size-cells : Must be present if the device has sub-nodes
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@ -16,6 +18,15 @@ Optional properties:
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- nand-ecc-mode : String, operation mode of the NAND ecc mode, soft by default.
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Supported values are: "none", "soft", "hw", "hw_syndrome", "hw_oob_first",
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"soft_bch".
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- atmel,has-pmecc : boolean to enable Programmable Multibit ECC hardware.
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Only supported by at91sam9x5 or later sam9 product.
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- atmel,pmecc-cap : error correct capability for Programmable Multibit ECC
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Controller. Supported values are: 2, 4, 8, 12, 24.
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- atmel,pmecc-sector-size : sector size for ECC computation. Supported values
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are: 512, 1024.
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- atmel,pmecc-lookup-table-offset : includes two offsets of lookup table in ROM
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for different sector size. First one is for sector size 512, the next is for
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sector size 1024.
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- nand-bus-width : 8 or 16 bus width if not present 8
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- nand-on-flash-bbt: boolean to enable on flash bbt option if not present false
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@ -39,3 +50,30 @@ nand0: nand@40000000,0 {
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...
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};
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};
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/* for PMECC supported chips */
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nand0: nand@40000000 {
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compatible = "atmel,at91rm9200-nand";
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#address-cells = <1>;
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#size-cells = <1>;
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reg = < 0x40000000 0x10000000 /* bus addr & size */
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0xffffe000 0x00000600 /* PMECC addr & size */
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0xffffe600 0x00000200 /* PMECC ERRLOC addr & size */
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0x00100000 0x00100000 /* ROM addr & size */
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>;
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atmel,nand-addr-offset = <21>; /* ale */
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atmel,nand-cmd-offset = <22>; /* cle */
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nand-on-flash-bbt;
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nand-ecc-mode = "hw";
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atmel,has-pmecc; /* enable PMECC */
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atmel,pmecc-cap = <2>;
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atmel,pmecc-sector-size = <512>;
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atmel,pmecc-lookup-table-offset = <0x8000 0x10000>;
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gpios = <&pioD 5 0 /* rdy */
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&pioD 4 0 /* nce */
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0 /* cd */
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>;
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partition@0 {
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...
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};
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};
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@ -93,6 +93,11 @@ struct atmel_nand_host {
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struct completion comp;
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struct dma_chan *dma_chan;
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bool has_pmecc;
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u8 pmecc_corr_cap;
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u16 pmecc_sector_size;
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u32 pmecc_lookup_table_offset;
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};
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static int cpu_has_dma(void)
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@ -481,7 +486,8 @@ static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
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static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
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struct device_node *np)
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{
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u32 val;
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u32 val, table_offset;
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u32 offset[2];
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int ecc_mode;
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struct atmel_nand_data *board = &host->board;
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enum of_gpio_flags flags;
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@ -517,6 +523,50 @@ static int __devinit atmel_of_init_port(struct atmel_nand_host *host,
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board->enable_pin = of_get_gpio(np, 1);
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board->det_pin = of_get_gpio(np, 2);
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host->has_pmecc = of_property_read_bool(np, "atmel,has-pmecc");
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if (!(board->ecc_mode == NAND_ECC_HW) || !host->has_pmecc)
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return 0; /* Not using PMECC */
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/* use PMECC, get correction capability, sector size and lookup
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* table offset.
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*/
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if (of_property_read_u32(np, "atmel,pmecc-cap", &val) != 0) {
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dev_err(host->dev, "Cannot decide PMECC Capability\n");
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return -EINVAL;
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} else if ((val != 2) && (val != 4) && (val != 8) && (val != 12) &&
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(val != 24)) {
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dev_err(host->dev,
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"Unsupported PMECC correction capability: %d; should be 2, 4, 8, 12 or 24\n",
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val);
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return -EINVAL;
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}
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host->pmecc_corr_cap = (u8)val;
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if (of_property_read_u32(np, "atmel,pmecc-sector-size", &val) != 0) {
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dev_err(host->dev, "Cannot decide PMECC Sector Size\n");
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return -EINVAL;
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} else if ((val != 512) && (val != 1024)) {
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dev_err(host->dev,
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"Unsupported PMECC sector size: %d; should be 512 or 1024 bytes\n",
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val);
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return -EINVAL;
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}
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host->pmecc_sector_size = (u16)val;
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if (of_property_read_u32_array(np, "atmel,pmecc-lookup-table-offset",
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offset, 2) != 0) {
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dev_err(host->dev, "Cannot get PMECC lookup table offset\n");
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return -EINVAL;
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}
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table_offset = host->pmecc_sector_size == 512 ? offset[0] : offset[1];
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if (!table_offset) {
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dev_err(host->dev, "Invalid PMECC lookup table offset\n");
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return -EINVAL;
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}
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host->pmecc_lookup_table_offset = table_offset;
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return 0;
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}
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#else
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