mtd: nand: davinci: add OF support for davinci nand controller

add OF support for the davinci nand controller.

Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Heiko Schocher 2012-07-30 09:22:24 +02:00 committed by David Woodhouse
parent a445f784ae
commit cdeadd712f
2 changed files with 122 additions and 1 deletions

View File

@ -0,0 +1,51 @@
* Texas Instruments Davinci NAND
This file provides information, what the device node for the
davinci nand interface contain.
Required properties:
- compatible: "ti,davinci-nand";
- reg : contain 2 offset/length values:
- offset and length for the access window
- offset and length for accessing the aemif control registers
- ti,davinci-chipselect: Indicates on the davinci_nand driver which
chipselect is used for accessing the nand.
Recommended properties :
- ti,davinci-mask-ale: mask for ale
- ti,davinci-mask-cle: mask for cle
- ti,davinci-mask-chipsel: mask for chipselect
- ti,davinci-ecc-mode: ECC mode valid values for davinci driver:
- "none"
- "soft"
- "hw"
- ti,davinci-ecc-bits: used ECC bits, currently supported 1 or 4.
- ti,davinci-nand-buswidth: buswidth 8 or 16
- ti,davinci-nand-use-bbt: use flash based bad block table support.
Example (enbw_cmc board):
aemif@60000000 {
compatible = "ti,davinci-aemif";
#address-cells = <2>;
#size-cells = <1>;
reg = <0x68000000 0x80000>;
ranges = <2 0 0x60000000 0x02000000
3 0 0x62000000 0x02000000
4 0 0x64000000 0x02000000
5 0 0x66000000 0x02000000
6 0 0x68000000 0x02000000>;
nand@3,0 {
compatible = "ti,davinci-nand";
reg = <3 0x0 0x807ff
6 0x0 0x8000>;
#address-cells = <1>;
#size-cells = <1>;
ti,davinci-chipselect = <1>;
ti,davinci-mask-ale = <0>;
ti,davinci-mask-cle = <0>;
ti,davinci-mask-chipsel = <0>;
ti,davinci-ecc-mode = "hw";
ti,davinci-ecc-bits = <4>;
ti,davinci-nand-use-bbt;
};
};

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@ -33,6 +33,7 @@
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <mach/nand.h>
#include <mach/aemif.h>
@ -518,9 +519,75 @@ static struct nand_ecclayout hwecc4_2048 __initconst = {
},
};
#if defined(CONFIG_OF)
static const struct of_device_id davinci_nand_of_match[] = {
{.compatible = "ti,davinci-nand", },
{},
}
MODULE_DEVICE_TABLE(of, davinci_nand_of_match);
static struct davinci_nand_pdata
*nand_davinci_get_pdata(struct platform_device *pdev)
{
if (!pdev->dev.platform_data && pdev->dev.of_node) {
struct davinci_nand_pdata *pdata;
const char *mode;
u32 prop;
int len;
pdata = devm_kzalloc(&pdev->dev,
sizeof(struct davinci_nand_pdata),
GFP_KERNEL);
pdev->dev.platform_data = pdata;
if (!pdata)
return NULL;
if (!of_property_read_u32(pdev->dev.of_node,
"ti,davinci-chipselect", &prop))
pdev->id = prop;
if (!of_property_read_u32(pdev->dev.of_node,
"ti,davinci-mask-ale", &prop))
pdata->mask_ale = prop;
if (!of_property_read_u32(pdev->dev.of_node,
"ti,davinci-mask-cle", &prop))
pdata->mask_cle = prop;
if (!of_property_read_u32(pdev->dev.of_node,
"ti,davinci-mask-chipsel", &prop))
pdata->mask_chipsel = prop;
if (!of_property_read_string(pdev->dev.of_node,
"ti,davinci-ecc-mode", &mode)) {
if (!strncmp("none", mode, 4))
pdata->ecc_mode = NAND_ECC_NONE;
if (!strncmp("soft", mode, 4))
pdata->ecc_mode = NAND_ECC_SOFT;
if (!strncmp("hw", mode, 2))
pdata->ecc_mode = NAND_ECC_HW;
}
if (!of_property_read_u32(pdev->dev.of_node,
"ti,davinci-ecc-bits", &prop))
pdata->ecc_bits = prop;
if (!of_property_read_u32(pdev->dev.of_node,
"ti,davinci-nand-buswidth", &prop))
if (prop == 16)
pdata->options |= NAND_BUSWIDTH_16;
if (of_find_property(pdev->dev.of_node,
"ti,davinci-nand-use-bbt", &len))
pdata->bbt_options = NAND_BBT_USE_FLASH;
}
return pdev->dev.platform_data;
}
#else
#define davinci_nand_of_match NULL
static struct davinci_nand_pdata
*nand_davinci_get_pdata(struct platform_device *pdev)
{
return pdev->dev.platform_data;
}
#endif
static int __init nand_davinci_probe(struct platform_device *pdev)
{
struct davinci_nand_pdata *pdata = pdev->dev.platform_data;
struct davinci_nand_pdata *pdata;
struct davinci_nand_info *info;
struct resource *res1;
struct resource *res2;
@ -530,6 +597,7 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
uint32_t val;
nand_ecc_modes_t ecc_mode;
pdata = nand_davinci_get_pdata(pdev);
/* insist on board-specific configuration */
if (!pdata)
return -ENODEV;
@ -816,6 +884,8 @@ static struct platform_driver nand_davinci_driver = {
.remove = __exit_p(nand_davinci_remove),
.driver = {
.name = "davinci_nand",
.owner = THIS_MODULE,
.of_match_table = davinci_nand_of_match,
},
};
MODULE_ALIAS("platform:davinci_nand");