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9b4041fa2e
Run `make target/linux/refresh` to align patches with OpenWrt style. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
74 lines
2.7 KiB
Diff
74 lines
2.7 KiB
Diff
From 784866bc4f9f25e0494b77750f95af2a2619e498 Mon Sep 17 00:00:00 2001
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From: Miquel Raynal <miquel.raynal@bootlin.com>
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Date: Thu, 16 Dec 2021 12:16:41 +0100
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Subject: [PATCH 03/15] mtd: nand: ecc: Provide a helper to retrieve a
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pilelined engine device
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In a pipelined engine situation, we might either have the host which
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internally has support for error correction, or have it using an
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external hardware block for this purpose. In the former case, the host
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is also the ECC engine. In the latter case, it is not. In order to get
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the right pointers on the right devices (for example: in order to devm_*
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allocate variables), let's introduce this helper which can safely be
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called by pipelined ECC engines in order to retrieve the right device
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structure.
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Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Link: https://lore.kernel.org/linux-mtd/20211216111654.238086-16-miquel.raynal@bootlin.com
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(cherry picked from commit 5145abeb0649acf810a32e63bd762e617a9b3309)
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---
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drivers/mtd/nand/ecc.c | 31 +++++++++++++++++++++++++++++++
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include/linux/mtd/nand.h | 1 +
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2 files changed, 32 insertions(+)
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--- a/drivers/mtd/nand/ecc.c
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+++ b/drivers/mtd/nand/ecc.c
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@@ -699,6 +699,37 @@ void nand_ecc_put_on_host_hw_engine(stru
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}
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EXPORT_SYMBOL(nand_ecc_put_on_host_hw_engine);
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+/*
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+ * In the case of a pipelined engine, the device registering the ECC
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+ * engine is not necessarily the ECC engine itself but may be a host controller.
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+ * It is then useful to provide a helper to retrieve the right device object
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+ * which actually represents the ECC engine.
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+ */
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+struct device *nand_ecc_get_engine_dev(struct device *host)
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+{
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+ struct platform_device *ecc_pdev;
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+ struct device_node *np;
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+
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+ /*
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+ * If the device node contains this property, it means we need to follow
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+ * it in order to get the right ECC engine device we are looking for.
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+ */
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+ np = of_parse_phandle(host->of_node, "nand-ecc-engine", 0);
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+ if (!np)
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+ return host;
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+
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+ ecc_pdev = of_find_device_by_node(np);
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+ if (!ecc_pdev) {
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+ of_node_put(np);
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+ return NULL;
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+ }
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+
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+ platform_device_put(ecc_pdev);
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+ of_node_put(np);
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+
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+ return &ecc_pdev->dev;
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+}
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+
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com>");
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MODULE_DESCRIPTION("Generic ECC engine");
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--- a/include/linux/mtd/nand.h
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+++ b/include/linux/mtd/nand.h
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@@ -309,6 +309,7 @@ struct nand_ecc_engine *nand_ecc_get_sw_
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struct nand_ecc_engine *nand_ecc_get_on_die_hw_engine(struct nand_device *nand);
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struct nand_ecc_engine *nand_ecc_get_on_host_hw_engine(struct nand_device *nand);
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void nand_ecc_put_on_host_hw_engine(struct nand_device *nand);
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+struct device *nand_ecc_get_engine_dev(struct device *host);
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#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
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struct nand_ecc_engine *nand_ecc_sw_hamming_get_engine(void);
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