forked from Minki/linux
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
David Woodhouse
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a445f784ae
commit
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51
Documentation/devicetree/bindings/arm/davinci/nand.txt
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51
Documentation/devicetree/bindings/arm/davinci/nand.txt
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@ -0,0 +1,51 @@
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* Texas Instruments Davinci NAND
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This file provides information, what the device node for the
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davinci nand interface contain.
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Required properties:
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- compatible: "ti,davinci-nand";
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- reg : contain 2 offset/length values:
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- offset and length for the access window
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- offset and length for accessing the aemif control registers
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- ti,davinci-chipselect: Indicates on the davinci_nand driver which
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chipselect is used for accessing the nand.
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Recommended properties :
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- ti,davinci-mask-ale: mask for ale
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- ti,davinci-mask-cle: mask for cle
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- ti,davinci-mask-chipsel: mask for chipselect
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- ti,davinci-ecc-mode: ECC mode valid values for davinci driver:
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- "none"
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- "soft"
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- "hw"
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- ti,davinci-ecc-bits: used ECC bits, currently supported 1 or 4.
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- ti,davinci-nand-buswidth: buswidth 8 or 16
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- ti,davinci-nand-use-bbt: use flash based bad block table support.
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Example (enbw_cmc board):
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aemif@60000000 {
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compatible = "ti,davinci-aemif";
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#address-cells = <2>;
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#size-cells = <1>;
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reg = <0x68000000 0x80000>;
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ranges = <2 0 0x60000000 0x02000000
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3 0 0x62000000 0x02000000
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4 0 0x64000000 0x02000000
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5 0 0x66000000 0x02000000
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6 0 0x68000000 0x02000000>;
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nand@3,0 {
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compatible = "ti,davinci-nand";
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reg = <3 0x0 0x807ff
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6 0x0 0x8000>;
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#address-cells = <1>;
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#size-cells = <1>;
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ti,davinci-chipselect = <1>;
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ti,davinci-mask-ale = <0>;
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ti,davinci-mask-cle = <0>;
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ti,davinci-mask-chipsel = <0>;
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ti,davinci-ecc-mode = "hw";
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ti,davinci-ecc-bits = <4>;
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ti,davinci-nand-use-bbt;
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};
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};
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@ -33,6 +33,7 @@
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <linux/slab.h>
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#include <linux/of_device.h>
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#include <mach/nand.h>
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#include <mach/aemif.h>
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@ -518,9 +519,75 @@ static struct nand_ecclayout hwecc4_2048 __initconst = {
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},
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};
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#if defined(CONFIG_OF)
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static const struct of_device_id davinci_nand_of_match[] = {
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{.compatible = "ti,davinci-nand", },
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{},
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}
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MODULE_DEVICE_TABLE(of, davinci_nand_of_match);
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static struct davinci_nand_pdata
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*nand_davinci_get_pdata(struct platform_device *pdev)
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{
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if (!pdev->dev.platform_data && pdev->dev.of_node) {
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struct davinci_nand_pdata *pdata;
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const char *mode;
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u32 prop;
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int len;
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pdata = devm_kzalloc(&pdev->dev,
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sizeof(struct davinci_nand_pdata),
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GFP_KERNEL);
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pdev->dev.platform_data = pdata;
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if (!pdata)
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return NULL;
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if (!of_property_read_u32(pdev->dev.of_node,
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"ti,davinci-chipselect", &prop))
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pdev->id = prop;
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if (!of_property_read_u32(pdev->dev.of_node,
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"ti,davinci-mask-ale", &prop))
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pdata->mask_ale = prop;
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if (!of_property_read_u32(pdev->dev.of_node,
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"ti,davinci-mask-cle", &prop))
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pdata->mask_cle = prop;
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if (!of_property_read_u32(pdev->dev.of_node,
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"ti,davinci-mask-chipsel", &prop))
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pdata->mask_chipsel = prop;
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if (!of_property_read_string(pdev->dev.of_node,
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"ti,davinci-ecc-mode", &mode)) {
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if (!strncmp("none", mode, 4))
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pdata->ecc_mode = NAND_ECC_NONE;
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if (!strncmp("soft", mode, 4))
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pdata->ecc_mode = NAND_ECC_SOFT;
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if (!strncmp("hw", mode, 2))
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pdata->ecc_mode = NAND_ECC_HW;
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}
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if (!of_property_read_u32(pdev->dev.of_node,
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"ti,davinci-ecc-bits", &prop))
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pdata->ecc_bits = prop;
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if (!of_property_read_u32(pdev->dev.of_node,
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"ti,davinci-nand-buswidth", &prop))
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if (prop == 16)
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pdata->options |= NAND_BUSWIDTH_16;
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if (of_find_property(pdev->dev.of_node,
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"ti,davinci-nand-use-bbt", &len))
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pdata->bbt_options = NAND_BBT_USE_FLASH;
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}
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return pdev->dev.platform_data;
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}
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#else
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#define davinci_nand_of_match NULL
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static struct davinci_nand_pdata
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*nand_davinci_get_pdata(struct platform_device *pdev)
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{
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return pdev->dev.platform_data;
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}
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#endif
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static int __init nand_davinci_probe(struct platform_device *pdev)
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{
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struct davinci_nand_pdata *pdata = pdev->dev.platform_data;
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struct davinci_nand_pdata *pdata;
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struct davinci_nand_info *info;
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struct resource *res1;
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struct resource *res2;
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@ -530,6 +597,7 @@ static int __init nand_davinci_probe(struct platform_device *pdev)
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uint32_t val;
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nand_ecc_modes_t ecc_mode;
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pdata = nand_davinci_get_pdata(pdev);
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/* insist on board-specific configuration */
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if (!pdata)
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return -ENODEV;
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@ -816,6 +884,8 @@ static struct platform_driver nand_davinci_driver = {
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.remove = __exit_p(nand_davinci_remove),
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.driver = {
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.name = "davinci_nand",
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.owner = THIS_MODULE,
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.of_match_table = davinci_nand_of_match,
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},
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};
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MODULE_ALIAS("platform:davinci_nand");
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