include/linux/mtd/rawnand.h

Source file repositories/reference/linux-study-clean/include/linux/mtd/rawnand.h

File Facts

System
Linux kernel
Corpus path
include/linux/mtd/rawnand.h
Extension
.h
Size
53764 bytes
Lines
1641
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct nand_parameters {
	/* Generic parameters */
	const char *model;
	bool supports_set_get_features;
	bool supports_read_cache;
	DECLARE_BITMAP(set_feature_list, ONFI_FEATURE_NUMBER);
	DECLARE_BITMAP(get_feature_list, ONFI_FEATURE_NUMBER);

	/* ONFI parameters */
	struct onfi_params *onfi;
};

/* The maximum expected count of bytes in the NAND ID sequence */
#define NAND_MAX_ID_LEN 8

/**
 * struct nand_id - NAND id structure
 * @data: buffer containing the id bytes.
 * @len: ID length.
 */
struct nand_id {
	u8 data[NAND_MAX_ID_LEN];
	int len;
};

/**
 * struct nand_ecc_step_info - ECC step information of ECC engine
 * @stepsize: data bytes per ECC step
 * @strengths: array of supported strengths
 * @nstrengths: number of supported strengths
 */
struct nand_ecc_step_info {
	int stepsize;
	const int *strengths;
	int nstrengths;
};

/**
 * struct nand_ecc_caps - capability of ECC engine
 * @stepinfos: array of ECC step information
 * @nstepinfos: number of ECC step information
 * @calc_ecc_bytes: driver's hook to calculate ECC bytes per step
 */
struct nand_ecc_caps {
	const struct nand_ecc_step_info *stepinfos;
	int nstepinfos;
	int (*calc_ecc_bytes)(int step_size, int strength);
};

/* a shorthand to generate struct nand_ecc_caps with only one ECC stepsize */
#define NAND_ECC_CAPS_SINGLE(__name, __calc, __step, ...)	\
static const int __name##_strengths[] = { __VA_ARGS__ };	\
static const struct nand_ecc_step_info __name##_stepinfo = {	\
	.stepsize = __step,					\
	.strengths = __name##_strengths,			\
	.nstrengths = ARRAY_SIZE(__name##_strengths),		\
};								\
static const struct nand_ecc_caps __name = {			\
	.stepinfos = &__name##_stepinfo,			\
	.nstepinfos = 1,					\
	.calc_ecc_bytes = __calc,				\
}

/**
 * struct nand_ecc_ctrl - Control structure for ECC
 * @engine_type: ECC engine type
 * @placement:	OOB bytes placement
 * @algo:	ECC algorithm
 * @steps:	number of ECC steps per page
 * @size:	data bytes per ECC step
 * @bytes:	ECC bytes per step
 * @strength:	max number of correctible bits per ECC step
 * @total:	total number of ECC bytes per page
 * @prepad:	padding information for syndrome based ECC generators
 * @postpad:	padding information for syndrome based ECC generators
 * @options:	ECC specific options (see NAND_ECC_XXX flags defined above)
 * @calc_buf:	buffer for calculated ECC, size is oobsize.
 * @code_buf:	buffer for ECC read from flash, size is oobsize.
 * @hwctl:	function to control hardware ECC generator. Must only
 *		be provided if an hardware ECC is available
 * @calculate:	function for ECC calculation or readback from ECC hardware
 * @correct:	function for ECC correction, matching to ECC generator (sw/hw).
 *		Should return a positive number representing the number of
 *		corrected bitflips, -EBADMSG if the number of bitflips exceed
 *		ECC strength, or any other error code if the error is not
 *		directly related to correction.
 *		If -EBADMSG is returned the input buffers should be left
 *		untouched.
 * @read_page_raw:	function to read a raw page without ECC. This function
 *			should hide the specific layout used by the ECC

Annotation

Implementation Notes