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author | Sascha Hauer <s.hauer@pengutronix.de> | 2013-07-11 18:55:30 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2013-07-16 08:46:30 +0200 |
commit | aa9e85c555924f9dc806a6f59034cb9c0b662c2a (patch) | |
tree | 5701ec3e46c7a797886621381a9032d2b4f9f9dd /drivers/of | |
parent | 3f0642d383451b71798a3aedb78ef5493b5f9629 (diff) | |
download | barebox-aa9e85c555924f9dc806a6f59034cb9c0b662c2a.tar.gz barebox-aa9e85c555924f9dc806a6f59034cb9c0b662c2a.tar.xz |
of: add mtd of helpers
Directly taken from the kernel
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/of')
-rw-r--r-- | drivers/of/Makefile | 1 | ||||
-rw-r--r-- | drivers/of/of_mtd.c | 82 |
2 files changed, 83 insertions, 0 deletions
diff --git a/drivers/of/Makefile b/drivers/of/Makefile index c81bbec89b..a64437305f 100644 --- a/drivers/of/Makefile +++ b/drivers/of/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_OFTREE_MEM_GENERIC) += mem_generic.o obj-$(CONFIG_GPIOLIB) += gpio.o obj-y += partition.o obj-y += of_net.o +obj-$(CONFIG_MTD) += of_mtd.o diff --git a/drivers/of/of_mtd.c b/drivers/of/of_mtd.c new file mode 100644 index 0000000000..239f1f9892 --- /dev/null +++ b/drivers/of/of_mtd.c @@ -0,0 +1,82 @@ +/* + * Copyright 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> + * + * OF helpers for mtd. + * + * This file is released under the GPLv2 + * + */ +#include <common.h> +#include <of_mtd.h> +#include <linux/mtd/nand.h> + +/** + * It maps 'enum nand_ecc_modes_t' found in include/linux/mtd/nand.h + * into the device tree binding of 'nand-ecc', so that MTD + * device driver can get nand ecc from device tree. + */ +static const char *nand_ecc_modes[] = { + [NAND_ECC_NONE] = "none", + [NAND_ECC_SOFT] = "soft", + [NAND_ECC_HW] = "hw", + [NAND_ECC_HW_SYNDROME] = "hw_syndrome", +}; + +/** + * of_get_nand_ecc_mode - Get nand ecc mode for given device_node + * @np: Pointer to the given device_node + * + * The function gets ecc mode string from property 'nand-ecc-mode', + * and return its index in nand_ecc_modes table, or errno in error case. + */ +int of_get_nand_ecc_mode(struct device_node *np) +{ + const char *pm; + int err, i; + + err = of_property_read_string(np, "nand-ecc-mode", &pm); + if (err < 0) + return err; + + for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++) + if (!strcasecmp(pm, nand_ecc_modes[i])) + return i; + + return -ENODEV; +} +EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode); + +/** + * of_get_nand_bus_width - Get nand bus witdh for given device_node + * @np: Pointer to the given device_node + * + * return bus width option, or errno in error case. + */ +int of_get_nand_bus_width(struct device_node *np) +{ + u32 val; + + if (of_property_read_u32(np, "nand-bus-width", &val)) + return 8; + + switch(val) { + case 8: + case 16: + return val; + default: + return -EIO; + } +} +EXPORT_SYMBOL_GPL(of_get_nand_bus_width); + +/** + * of_get_nand_on_flash_bbt - Get nand on flash bbt for given device_node + * @np: Pointer to the given device_node + * + * return true if present false other wise + */ +bool of_get_nand_on_flash_bbt(struct device_node *np) +{ + return of_property_read_bool(np, "nand-on-flash-bbt"); +} +EXPORT_SYMBOL_GPL(of_get_nand_on_flash_bbt); |