add OF support for the davinci nand controller.
Signed-off-by: Heiko Schocher <h...@denx.de>
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: linux-arm-ker...@lists.infradead.org
Cc: devicetree-disc...@lists.ozlabs.org
Cc: linux-...@lists.infradead.org
Cc: David Woodhouse <dw...@infradead.org>
Cc: Grant Likely <grant.lik...@secretlab.ca>
Cc: Sekhar Nori <nsek...@ti.com>
Cc: Wolfgang Denk <w...@denx.de>
Cc: Scott Wood <scottw...@freescale.com>
---
- changes for v2:
- add comments from Scott Wood:
- add "ti,davinci-" prefix
- Dashes are preferred to underscores
- rename "nandflash" to "nand"
- introduce new "ti,davinci" specific properties for setting
up ecc_mode, ecc_bits, options and bbt options, instead
using linux defines
- readme fixes
- no changes for v3
.../devicetree/bindings/arm/davinci/nand.txt | 74 +++++++++++++++++
drivers/mtd/nand/davinci_nand.c | 85 +++++++++++++++++++-
2 files changed, 158 insertions(+), 1 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/davinci/nand.txt
diff --git a/Documentation/devicetree/bindings/arm/davinci/nand.txt
b/Documentation/devicetree/bindings/arm/davinci/nand.txt
new file mode 100644
index 0000000..e02874a
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/davinci/nand.txt
@@ -0,0 +1,74 @@
+* 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.
+
+Optional properties:
+- pinmux-handle: contains a handle to configure the pinmux settings.
+- timing-handle: contains a handle to setup aemif timing.
+
+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_cs: cs3@68000000 {
+ compatible = "ti,davinci-cs";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ /* all timings in nanoseconds */
+ cs = <3>;
+ asize = <0>;
+ ta = <0>;
+ rhold = <7>;
+ rstrobe = <42>;
+ rsetup = <7>;
+ whold = <7>;
+ wstrobe = <14>;
+ wsetup = <7>;
+ ew = <0>;
+ ss = <0>;
+ };
+ 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;
+ pinmux-handle = <&nand_pins>;
+ timing-handle = <&nand_cs>;
+ };
+};
diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 6e56615..bdd6edc 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -33,9 +33,12 @@
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/slab.h>
+#include <linux/of_i2c.h>
+#include <linux/of_device.h>
#include <mach/nand.h>
#include <mach/aemif.h>
+#include <mach/mux.h>
/*
* This is a device driver for the NAND flash controller found on the
@@ -518,9 +521,86 @@ 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 == NULL) &&
+ (pdev->dev.of_node)) {
+ struct device_node *tmp_np;
+ struct davinci_nand_pdata *pdata;
+ const char *mode;
+ u32 prop;
+ int len;
+
+ pdata = kzalloc(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;
+
+ tmp_np = of_parse_phandle(pdev->dev.of_node,
+ "pinmux-handle", 0);
+ if (tmp_np)
+ davinci_cfg_reg_of(tmp_np);
+
+ tmp_np = of_parse_phandle(pdev->dev.of_node,
+ "timing-handle", 0);
+ if (tmp_np)
+ davinci_aemif_setup_timing_of(tmp_np);
+ }
+
+ 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 +610,7 @@ 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;
@@ -815,6 +896,8 @@ 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");
--
1.7.7.6
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