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92 lines
2.8 KiB
92 lines
2.8 KiB
8 years ago
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From 410a91f6efa1c4c3c4369d1dd2c31286749dff33 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Wed, 23 Mar 2016 11:19:01 +0100
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Subject: [PATCH 073/102] of: mtd: prepare helper reading NAND ECC algo from
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DT
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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NAND subsystem is being slightly reworked to store ECC details in
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separated fields. In future we'll want to add support for more DT
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properties as specifying every possible setup with a single
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"nand-ecc-mode" is a pretty bad idea.
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To allow this let's add a helper that will support something like
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"nand-ecc-algo" in future. Right now we use it for keeping backward
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compatibility.
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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---
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drivers/of/of_mtd.c | 36 ++++++++++++++++++++++++++++++++++++
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include/linux/of_mtd.h | 6 ++++++
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2 files changed, 42 insertions(+)
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--- a/drivers/of/of_mtd.c
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+++ b/drivers/of/of_mtd.c
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@@ -50,6 +50,42 @@ int of_get_nand_ecc_mode(struct device_n
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EXPORT_SYMBOL_GPL(of_get_nand_ecc_mode);
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/**
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+ * of_get_nand_ecc_algo - Get nand ecc algorithm for given device_node
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+ * @np: Pointer to the given device_node
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+ *
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+ * The function gets ecc algorithm and returns its enum value, or errno in error
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+ * case.
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+ */
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+int of_get_nand_ecc_algo(struct device_node *np)
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+{
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+ const char *pm;
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+ int err;
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+
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+ /*
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+ * TODO: Read ECC algo OF property and map it to enum nand_ecc_algo.
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+ * It's not implemented yet as currently NAND subsystem ignores
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+ * algorithm explicitly set this way. Once it's handled we should
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+ * document & support new property.
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+ */
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+
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+ /*
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+ * For backward compatibility we also read "nand-ecc-mode" checking
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+ * for some obsoleted values that were specifying ECC algorithm.
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+ */
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+ err = of_property_read_string(np, "nand-ecc-mode", &pm);
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+ if (err < 0)
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+ return err;
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+
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+ if (!strcasecmp(pm, "soft"))
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+ return NAND_ECC_HAMMING;
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+ else if (!strcasecmp(pm, "soft_bch"))
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+ return NAND_ECC_BCH;
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+
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+ return -ENODEV;
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+}
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+EXPORT_SYMBOL_GPL(of_get_nand_ecc_algo);
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+
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+/**
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* of_get_nand_ecc_step_size - Get ECC step size associated to
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* the required ECC strength (see below).
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* @np: Pointer to the given device_node
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--- a/include/linux/of_mtd.h
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+++ b/include/linux/of_mtd.h
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@@ -13,6 +13,7 @@
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#include <linux/of.h>
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int of_get_nand_ecc_mode(struct device_node *np);
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+int of_get_nand_ecc_algo(struct device_node *np);
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int of_get_nand_ecc_step_size(struct device_node *np);
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int of_get_nand_ecc_strength(struct device_node *np);
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int of_get_nand_bus_width(struct device_node *np);
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@@ -24,6 +25,11 @@ static inline int of_get_nand_ecc_mode(s
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{
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return -ENOSYS;
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}
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+
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+static inline int of_get_nand_ecc_algo(struct device_node *np)
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+{
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+ return -ENOSYS;
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+}
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static inline int of_get_nand_ecc_step_size(struct device_node *np)
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{
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