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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
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parent
1d46963d45
commit
96489c1c0b
3 changed files with 123 additions and 3 deletions
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@ -235,7 +235,9 @@ static int nanddev_get_ecc_engine(struct nand_device *nand)
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nand->ecc.engine = nand_ecc_get_on_die_hw_engine(nand);
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break;
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case NAND_ECC_ENGINE_TYPE_ON_HOST:
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pr_err("On-host hardware ECC engines not supported yet\n");
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nand->ecc.engine = nand_ecc_get_on_host_hw_engine(nand);
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if (PTR_ERR(nand->ecc.engine) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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break;
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default:
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pr_err("Missing ECC engine type\n");
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@ -255,7 +257,7 @@ static int nanddev_put_ecc_engine(struct nand_device *nand)
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{
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switch (nand->ecc.ctx.conf.engine_type) {
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case NAND_ECC_ENGINE_TYPE_ON_HOST:
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pr_err("On-host hardware ECC engines not supported yet\n");
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nand_ecc_put_on_host_hw_engine(nand);
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break;
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case NAND_ECC_ENGINE_TYPE_NONE:
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case NAND_ECC_ENGINE_TYPE_SOFT:
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@ -300,7 +302,9 @@ int nanddev_ecc_engine_init(struct nand_device *nand)
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/* Look for the ECC engine to use */
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ret = nanddev_get_ecc_engine(nand);
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if (ret) {
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pr_err("No ECC engine found\n");
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if (ret != -EPROBE_DEFER)
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pr_err("No ECC engine found\n");
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return ret;
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}
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@ -96,6 +96,12 @@
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#include <linux/module.h>
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#include <linux/mtd/nand.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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static LIST_HEAD(on_host_hw_engines);
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static DEFINE_MUTEX(on_host_hw_engines_mutex);
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/**
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* nand_ecc_init_ctx - Init the ECC engine context
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@ -611,6 +617,88 @@ struct nand_ecc_engine *nand_ecc_get_on_die_hw_engine(struct nand_device *nand)
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}
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EXPORT_SYMBOL(nand_ecc_get_on_die_hw_engine);
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int nand_ecc_register_on_host_hw_engine(struct nand_ecc_engine *engine)
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{
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struct nand_ecc_engine *item;
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if (!engine)
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return -EINVAL;
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/* Prevent multiple registrations of one engine */
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list_for_each_entry(item, &on_host_hw_engines, node)
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if (item == engine)
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return 0;
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mutex_lock(&on_host_hw_engines_mutex);
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list_add_tail(&engine->node, &on_host_hw_engines);
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mutex_unlock(&on_host_hw_engines_mutex);
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return 0;
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}
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EXPORT_SYMBOL(nand_ecc_register_on_host_hw_engine);
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int nand_ecc_unregister_on_host_hw_engine(struct nand_ecc_engine *engine)
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{
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if (!engine)
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return -EINVAL;
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mutex_lock(&on_host_hw_engines_mutex);
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list_del(&engine->node);
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mutex_unlock(&on_host_hw_engines_mutex);
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return 0;
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}
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EXPORT_SYMBOL(nand_ecc_unregister_on_host_hw_engine);
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static struct nand_ecc_engine *nand_ecc_match_on_host_hw_engine(struct device *dev)
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{
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struct nand_ecc_engine *item;
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list_for_each_entry(item, &on_host_hw_engines, node)
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if (item->dev == dev)
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return item;
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return NULL;
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}
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struct nand_ecc_engine *nand_ecc_get_on_host_hw_engine(struct nand_device *nand)
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{
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struct nand_ecc_engine *engine = NULL;
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struct device *dev = &nand->mtd.dev;
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struct platform_device *pdev;
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struct device_node *np;
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if (list_empty(&on_host_hw_engines))
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return NULL;
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/* Check for an explicit nand-ecc-engine property */
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np = of_parse_phandle(dev->of_node, "nand-ecc-engine", 0);
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if (np) {
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pdev = of_find_device_by_node(np);
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if (!pdev)
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return ERR_PTR(-EPROBE_DEFER);
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engine = nand_ecc_match_on_host_hw_engine(&pdev->dev);
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platform_device_put(pdev);
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of_node_put(np);
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if (!engine)
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return ERR_PTR(-EPROBE_DEFER);
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}
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if (engine)
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get_device(engine->dev);
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return engine;
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}
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EXPORT_SYMBOL(nand_ecc_get_on_host_hw_engine);
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void nand_ecc_put_on_host_hw_engine(struct nand_device *nand)
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{
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put_device(nand->ecc.engine->dev);
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}
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EXPORT_SYMBOL(nand_ecc_put_on_host_hw_engine);
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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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@ -263,12 +263,36 @@ struct nand_ecc_engine_ops {
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struct nand_page_io_req *req);
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};
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/**
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* enum nand_ecc_engine_integration - How the NAND ECC engine is integrated
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* @NAND_ECC_ENGINE_INTEGRATION_INVALID: Invalid value
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* @NAND_ECC_ENGINE_INTEGRATION_PIPELINED: Pipelined engine, performs on-the-fly
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* correction, does not need to copy
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* data around
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* @NAND_ECC_ENGINE_INTEGRATION_EXTERNAL: External engine, needs to bring the
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* data into its own area before use
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*/
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enum nand_ecc_engine_integration {
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NAND_ECC_ENGINE_INTEGRATION_INVALID,
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NAND_ECC_ENGINE_INTEGRATION_PIPELINED,
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NAND_ECC_ENGINE_INTEGRATION_EXTERNAL,
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};
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/**
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* struct nand_ecc_engine - ECC engine abstraction for NAND devices
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* @dev: Host device
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* @node: Private field for registration time
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* @ops: ECC engine operations
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* @integration: How the engine is integrated with the host
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* (only relevant on %NAND_ECC_ENGINE_TYPE_ON_HOST engines)
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* @priv: Private data
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*/
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struct nand_ecc_engine {
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struct device *dev;
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struct list_head node;
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struct nand_ecc_engine_ops *ops;
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enum nand_ecc_engine_integration integration;
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void *priv;
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};
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void of_get_nand_ecc_user_config(struct nand_device *nand);
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@ -279,8 +303,12 @@ int nand_ecc_prepare_io_req(struct nand_device *nand,
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int nand_ecc_finish_io_req(struct nand_device *nand,
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struct nand_page_io_req *req);
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bool nand_ecc_is_strong_enough(struct nand_device *nand);
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int nand_ecc_register_on_host_hw_engine(struct nand_ecc_engine *engine);
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int nand_ecc_unregister_on_host_hw_engine(struct nand_ecc_engine *engine);
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struct nand_ecc_engine *nand_ecc_get_sw_engine(struct nand_device *nand);
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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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#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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