mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-21 06:33:41 +00:00
9b4041fa2e
Run `make target/linux/refresh` to align patches with OpenWrt style. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
215 lines
6.8 KiB
Diff
215 lines
6.8 KiB
Diff
From ad4944aa0b02cb043afe20bc2a018c161e65c992 Mon Sep 17 00:00:00 2001
|
|
From: Miquel Raynal <miquel.raynal@bootlin.com>
|
|
Date: Thu, 16 Dec 2021 12:16:38 +0100
|
|
Subject: [PATCH 01/15] mtd: nand: ecc: Add infrastructure to support hardware
|
|
engines
|
|
|
|
Add the necessary helpers to register/unregister hardware ECC engines
|
|
that will be called from ECC engine drivers.
|
|
|
|
Also add helpers to get the right engine from the user
|
|
perspective. Keep a reference of the in use ECC engine in order to
|
|
prevent modules to be unloaded. Put the reference when the engine gets
|
|
retired.
|
|
|
|
A static list of hardware (only) ECC engines is setup to keep track of
|
|
the registered engines.
|
|
|
|
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
|
|
Link: https://lore.kernel.org/linux-mtd/20211216111654.238086-13-miquel.raynal@bootlin.com
|
|
(cherry picked from commit 96489c1c0b53131b0e1ec33e2060538379ad6152)
|
|
---
|
|
drivers/mtd/nand/core.c | 10 +++--
|
|
drivers/mtd/nand/ecc.c | 88 ++++++++++++++++++++++++++++++++++++++++
|
|
include/linux/mtd/nand.h | 28 +++++++++++++
|
|
3 files changed, 123 insertions(+), 3 deletions(-)
|
|
|
|
--- a/drivers/mtd/nand/core.c
|
|
+++ b/drivers/mtd/nand/core.c
|
|
@@ -232,7 +232,9 @@ static int nanddev_get_ecc_engine(struct
|
|
nand->ecc.engine = nand_ecc_get_on_die_hw_engine(nand);
|
|
break;
|
|
case NAND_ECC_ENGINE_TYPE_ON_HOST:
|
|
- pr_err("On-host hardware ECC engines not supported yet\n");
|
|
+ nand->ecc.engine = nand_ecc_get_on_host_hw_engine(nand);
|
|
+ if (PTR_ERR(nand->ecc.engine) == -EPROBE_DEFER)
|
|
+ return -EPROBE_DEFER;
|
|
break;
|
|
default:
|
|
pr_err("Missing ECC engine type\n");
|
|
@@ -252,7 +254,7 @@ static int nanddev_put_ecc_engine(struct
|
|
{
|
|
switch (nand->ecc.ctx.conf.engine_type) {
|
|
case NAND_ECC_ENGINE_TYPE_ON_HOST:
|
|
- pr_err("On-host hardware ECC engines not supported yet\n");
|
|
+ nand_ecc_put_on_host_hw_engine(nand);
|
|
break;
|
|
case NAND_ECC_ENGINE_TYPE_NONE:
|
|
case NAND_ECC_ENGINE_TYPE_SOFT:
|
|
@@ -297,7 +299,9 @@ int nanddev_ecc_engine_init(struct nand_
|
|
/* Look for the ECC engine to use */
|
|
ret = nanddev_get_ecc_engine(nand);
|
|
if (ret) {
|
|
- pr_err("No ECC engine found\n");
|
|
+ if (ret != -EPROBE_DEFER)
|
|
+ pr_err("No ECC engine found\n");
|
|
+
|
|
return ret;
|
|
}
|
|
|
|
--- a/drivers/mtd/nand/ecc.c
|
|
+++ b/drivers/mtd/nand/ecc.c
|
|
@@ -96,6 +96,12 @@
|
|
#include <linux/module.h>
|
|
#include <linux/mtd/nand.h>
|
|
#include <linux/slab.h>
|
|
+#include <linux/of.h>
|
|
+#include <linux/of_device.h>
|
|
+#include <linux/of_platform.h>
|
|
+
|
|
+static LIST_HEAD(on_host_hw_engines);
|
|
+static DEFINE_MUTEX(on_host_hw_engines_mutex);
|
|
|
|
/**
|
|
* nand_ecc_init_ctx - Init the ECC engine context
|
|
@@ -611,6 +617,88 @@ struct nand_ecc_engine *nand_ecc_get_on_
|
|
}
|
|
EXPORT_SYMBOL(nand_ecc_get_on_die_hw_engine);
|
|
|
|
+int nand_ecc_register_on_host_hw_engine(struct nand_ecc_engine *engine)
|
|
+{
|
|
+ struct nand_ecc_engine *item;
|
|
+
|
|
+ if (!engine)
|
|
+ return -EINVAL;
|
|
+
|
|
+ /* Prevent multiple registrations of one engine */
|
|
+ list_for_each_entry(item, &on_host_hw_engines, node)
|
|
+ if (item == engine)
|
|
+ return 0;
|
|
+
|
|
+ mutex_lock(&on_host_hw_engines_mutex);
|
|
+ list_add_tail(&engine->node, &on_host_hw_engines);
|
|
+ mutex_unlock(&on_host_hw_engines_mutex);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+EXPORT_SYMBOL(nand_ecc_register_on_host_hw_engine);
|
|
+
|
|
+int nand_ecc_unregister_on_host_hw_engine(struct nand_ecc_engine *engine)
|
|
+{
|
|
+ if (!engine)
|
|
+ return -EINVAL;
|
|
+
|
|
+ mutex_lock(&on_host_hw_engines_mutex);
|
|
+ list_del(&engine->node);
|
|
+ mutex_unlock(&on_host_hw_engines_mutex);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+EXPORT_SYMBOL(nand_ecc_unregister_on_host_hw_engine);
|
|
+
|
|
+static struct nand_ecc_engine *nand_ecc_match_on_host_hw_engine(struct device *dev)
|
|
+{
|
|
+ struct nand_ecc_engine *item;
|
|
+
|
|
+ list_for_each_entry(item, &on_host_hw_engines, node)
|
|
+ if (item->dev == dev)
|
|
+ return item;
|
|
+
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+struct nand_ecc_engine *nand_ecc_get_on_host_hw_engine(struct nand_device *nand)
|
|
+{
|
|
+ struct nand_ecc_engine *engine = NULL;
|
|
+ struct device *dev = &nand->mtd.dev;
|
|
+ struct platform_device *pdev;
|
|
+ struct device_node *np;
|
|
+
|
|
+ if (list_empty(&on_host_hw_engines))
|
|
+ return NULL;
|
|
+
|
|
+ /* Check for an explicit nand-ecc-engine property */
|
|
+ np = of_parse_phandle(dev->of_node, "nand-ecc-engine", 0);
|
|
+ if (np) {
|
|
+ pdev = of_find_device_by_node(np);
|
|
+ if (!pdev)
|
|
+ return ERR_PTR(-EPROBE_DEFER);
|
|
+
|
|
+ engine = nand_ecc_match_on_host_hw_engine(&pdev->dev);
|
|
+ platform_device_put(pdev);
|
|
+ of_node_put(np);
|
|
+
|
|
+ if (!engine)
|
|
+ return ERR_PTR(-EPROBE_DEFER);
|
|
+ }
|
|
+
|
|
+ if (engine)
|
|
+ get_device(engine->dev);
|
|
+
|
|
+ return engine;
|
|
+}
|
|
+EXPORT_SYMBOL(nand_ecc_get_on_host_hw_engine);
|
|
+
|
|
+void nand_ecc_put_on_host_hw_engine(struct nand_device *nand)
|
|
+{
|
|
+ put_device(nand->ecc.engine->dev);
|
|
+}
|
|
+EXPORT_SYMBOL(nand_ecc_put_on_host_hw_engine);
|
|
+
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com>");
|
|
MODULE_DESCRIPTION("Generic ECC engine");
|
|
--- a/include/linux/mtd/nand.h
|
|
+++ b/include/linux/mtd/nand.h
|
|
@@ -264,11 +264,35 @@ struct nand_ecc_engine_ops {
|
|
};
|
|
|
|
/**
|
|
+ * enum nand_ecc_engine_integration - How the NAND ECC engine is integrated
|
|
+ * @NAND_ECC_ENGINE_INTEGRATION_INVALID: Invalid value
|
|
+ * @NAND_ECC_ENGINE_INTEGRATION_PIPELINED: Pipelined engine, performs on-the-fly
|
|
+ * correction, does not need to copy
|
|
+ * data around
|
|
+ * @NAND_ECC_ENGINE_INTEGRATION_EXTERNAL: External engine, needs to bring the
|
|
+ * data into its own area before use
|
|
+ */
|
|
+enum nand_ecc_engine_integration {
|
|
+ NAND_ECC_ENGINE_INTEGRATION_INVALID,
|
|
+ NAND_ECC_ENGINE_INTEGRATION_PIPELINED,
|
|
+ NAND_ECC_ENGINE_INTEGRATION_EXTERNAL,
|
|
+};
|
|
+
|
|
+/**
|
|
* struct nand_ecc_engine - ECC engine abstraction for NAND devices
|
|
+ * @dev: Host device
|
|
+ * @node: Private field for registration time
|
|
* @ops: ECC engine operations
|
|
+ * @integration: How the engine is integrated with the host
|
|
+ * (only relevant on %NAND_ECC_ENGINE_TYPE_ON_HOST engines)
|
|
+ * @priv: Private data
|
|
*/
|
|
struct nand_ecc_engine {
|
|
+ struct device *dev;
|
|
+ struct list_head node;
|
|
struct nand_ecc_engine_ops *ops;
|
|
+ enum nand_ecc_engine_integration integration;
|
|
+ void *priv;
|
|
};
|
|
|
|
void of_get_nand_ecc_user_config(struct nand_device *nand);
|
|
@@ -279,8 +303,12 @@ int nand_ecc_prepare_io_req(struct nand_
|
|
int nand_ecc_finish_io_req(struct nand_device *nand,
|
|
struct nand_page_io_req *req);
|
|
bool nand_ecc_is_strong_enough(struct nand_device *nand);
|
|
+int nand_ecc_register_on_host_hw_engine(struct nand_ecc_engine *engine);
|
|
+int nand_ecc_unregister_on_host_hw_engine(struct nand_ecc_engine *engine);
|
|
struct nand_ecc_engine *nand_ecc_get_sw_engine(struct nand_device *nand);
|
|
struct nand_ecc_engine *nand_ecc_get_on_die_hw_engine(struct nand_device *nand);
|
|
+struct nand_ecc_engine *nand_ecc_get_on_host_hw_engine(struct nand_device *nand);
|
|
+void nand_ecc_put_on_host_hw_engine(struct nand_device *nand);
|
|
|
|
#if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING)
|
|
struct nand_ecc_engine *nand_ecc_sw_hamming_get_engine(void);
|