linux/drivers/mtd/nand/raw/nand_timings.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 2014 Free Electrons
 *
 *  Author: Boris BREZILLON <[email protected]>
 */
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/export.h>

#include "internals.h"

#define ONFI_DYN_TIMING_MAX …

/*
 * For non-ONFI chips we use the highest possible value for tPROG and tBERS.
 * tR and tCCS will take the default values precised in the ONFI specification
 * for timing mode 0, respectively 200us and 500ns.
 *
 * These four values are tweaked to be more accurate in the case of ONFI chips.
 */
static const struct nand_interface_config onfi_sdr_timings[] = …;

static const struct nand_interface_config onfi_nvddr_timings[] = …;

/* All NAND chips share the same reset data interface: SDR mode 0 */
const struct nand_interface_config *nand_get_reset_interface_config(void)
{ … }

/**
 * onfi_find_closest_sdr_mode - Derive the closest ONFI SDR timing mode given a
 *                              set of timings
 * @spec_timings: the timings to challenge
 */
unsigned int
onfi_find_closest_sdr_mode(const struct nand_sdr_timings *spec_timings)
{ … }

/**
 * onfi_find_closest_nvddr_mode - Derive the closest ONFI NVDDR timing mode
 *                                given a set of timings
 * @spec_timings: the timings to challenge
 */
unsigned int
onfi_find_closest_nvddr_mode(const struct nand_nvddr_timings *spec_timings)
{ … }

/*
 * onfi_fill_sdr_interface_config - Initialize a SDR interface config from a
 *                                  given ONFI mode
 * @chip: The NAND chip
 * @iface: The interface configuration to fill
 * @timing_mode: The ONFI timing mode
 */
static void onfi_fill_sdr_interface_config(struct nand_chip *chip,
					   struct nand_interface_config *iface,
					   unsigned int timing_mode)
{ … }

/**
 * onfi_fill_nvddr_interface_config - Initialize a NVDDR interface config from a
 *                                    given ONFI mode
 * @chip: The NAND chip
 * @iface: The interface configuration to fill
 * @timing_mode: The ONFI timing mode
 */
static void onfi_fill_nvddr_interface_config(struct nand_chip *chip,
					     struct nand_interface_config *iface,
					     unsigned int timing_mode)
{ … }

/**
 * onfi_fill_interface_config - Initialize an interface config from a given
 *                              ONFI mode
 * @chip: The NAND chip
 * @iface: The interface configuration to fill
 * @type: The interface type
 * @timing_mode: The ONFI timing mode
 */
void onfi_fill_interface_config(struct nand_chip *chip,
				struct nand_interface_config *iface,
				enum nand_interface_type type,
				unsigned int timing_mode)
{ … }