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

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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
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72
drivers/mtd/nand/davinci_nand.c
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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");