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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2014 Free Electrons
*
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*/
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/export.h>
#include "internals.h"
#define ONFI_DYN_TIMING_MAX U16_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[] = {
/* Mode 0 */
{
.type = NAND_SDR_IFACE,
.timings.mode = 0,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tPROG_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tBERS_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tADL_min = 400000,
.tALH_min = 20000,
.tALS_min = 50000,
.tAR_min = 25000,
.tCEA_max = 100000,
.tCEH_min = 20000,
.tCH_min = 20000,
.tCHZ_max = 100000,
.tCLH_min = 20000,
.tCLR_min = 20000,
.tCLS_min = 50000,
.tCOH_min = 0,
.tCS_min = 70000,
.tDH_min = 20000,
.tDS_min = 40000,
.tFEAT_max = 1000000,
.tIR_min = 10000,
.tITC_max = 1000000,
.tRC_min = 100000,
.tREA_max = 40000,
.tREH_min = 30000,
.tRHOH_min = 0,
.tRHW_min = 200000,
.tRHZ_max = 200000,
.tRLOH_min = 0,
.tRP_min = 50000,
.tRR_min = 40000,
.tRST_max = 250000000000ULL,
.tWB_max = 200000,
.tWC_min = 100000,
.tWH_min = 30000,
.tWHR_min = 120000,
.tWP_min = 50000,
.tWW_min = 100000,
},
},
/* Mode 1 */
{
.type = NAND_SDR_IFACE,
.timings.mode = 1,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tPROG_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tBERS_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tADL_min = 400000,
.tALH_min = 10000,
.tALS_min = 25000,
.tAR_min = 10000,
.tCEA_max = 45000,
.tCEH_min = 20000,
.tCH_min = 10000,
.tCHZ_max = 50000,
.tCLH_min = 10000,
.tCLR_min = 10000,
.tCLS_min = 25000,
.tCOH_min = 15000,
.tCS_min = 35000,
.tDH_min = 10000,
.tDS_min = 20000,
.tFEAT_max = 1000000,
.tIR_min = 0,
.tITC_max = 1000000,
.tRC_min = 50000,
.tREA_max = 30000,
.tREH_min = 15000,
.tRHOH_min = 15000,
.tRHW_min = 100000,
.tRHZ_max = 100000,
.tRLOH_min = 0,
.tRP_min = 25000,
.tRR_min = 20000,
.tRST_max = 500000000,
.tWB_max = 100000,
.tWC_min = 45000,
.tWH_min = 15000,
.tWHR_min = 80000,
.tWP_min = 25000,
.tWW_min = 100000,
},
},
/* Mode 2 */
{
.type = NAND_SDR_IFACE,
.timings.mode = 2,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tPROG_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tBERS_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tADL_min = 400000,
.tALH_min = 10000,
.tALS_min = 15000,
.tAR_min = 10000,
.tCEA_max = 30000,
.tCEH_min = 20000,
.tCH_min = 10000,
.tCHZ_max = 50000,
.tCLH_min = 10000,
.tCLR_min = 10000,
.tCLS_min = 15000,
.tCOH_min = 15000,
.tCS_min = 25000,
.tDH_min = 5000,
.tDS_min = 15000,
.tFEAT_max = 1000000,
.tIR_min = 0,
.tITC_max = 1000000,
.tRC_min = 35000,
.tREA_max = 25000,
.tREH_min = 15000,
.tRHOH_min = 15000,
.tRHW_min = 100000,
.tRHZ_max = 100000,
.tRLOH_min = 0,
.tRR_min = 20000,
.tRST_max = 500000000,
.tWB_max = 100000,
.tRP_min = 17000,
.tWC_min = 35000,
.tWH_min = 15000,
.tWHR_min = 80000,
.tWP_min = 17000,
.tWW_min = 100000,
},
},
/* Mode 3 */
{
.type = NAND_SDR_IFACE,
.timings.mode = 3,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tPROG_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tBERS_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tADL_min = 400000,
.tALH_min = 5000,
.tALS_min = 10000,
.tAR_min = 10000,
.tCEA_max = 25000,
.tCEH_min = 20000,
.tCH_min = 5000,
.tCHZ_max = 50000,
.tCLH_min = 5000,
.tCLR_min = 10000,
.tCLS_min = 10000,
.tCOH_min = 15000,
.tCS_min = 25000,
.tDH_min = 5000,
.tDS_min = 10000,
.tFEAT_max = 1000000,
.tIR_min = 0,
.tITC_max = 1000000,
.tRC_min = 30000,
.tREA_max = 20000,
.tREH_min = 10000,
.tRHOH_min = 15000,
.tRHW_min = 100000,
.tRHZ_max = 100000,
.tRLOH_min = 0,
.tRP_min = 15000,
.tRR_min = 20000,
.tRST_max = 500000000,
.tWB_max = 100000,
.tWC_min = 30000,
.tWH_min = 10000,
.tWHR_min = 80000,
.tWP_min = 15000,
.tWW_min = 100000,
},
},
/* Mode 4 */
{
.type = NAND_SDR_IFACE,
.timings.mode = 4,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tPROG_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tBERS_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tADL_min = 400000,
.tALH_min = 5000,
.tALS_min = 10000,
.tAR_min = 10000,
.tCEA_max = 25000,
.tCEH_min = 20000,
.tCH_min = 5000,
.tCHZ_max = 30000,
.tCLH_min = 5000,
.tCLR_min = 10000,
.tCLS_min = 10000,
.tCOH_min = 15000,
.tCS_min = 20000,
.tDH_min = 5000,
.tDS_min = 10000,
.tFEAT_max = 1000000,
.tIR_min = 0,
.tITC_max = 1000000,
.tRC_min = 25000,
.tREA_max = 20000,
.tREH_min = 10000,
.tRHOH_min = 15000,
.tRHW_min = 100000,
.tRHZ_max = 100000,
.tRLOH_min = 5000,
.tRP_min = 12000,
.tRR_min = 20000,
.tRST_max = 500000000,
.tWB_max = 100000,
.tWC_min = 25000,
.tWH_min = 10000,
.tWHR_min = 80000,
.tWP_min = 12000,
.tWW_min = 100000,
},
},
/* Mode 5 */
{
.type = NAND_SDR_IFACE,
.timings.mode = 5,
.timings.sdr = {
.tCCS_min = 500000,
.tR_max = 200000000,
.tPROG_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tBERS_max = 1000000ULL * ONFI_DYN_TIMING_MAX,
.tADL_min = 400000,
.tALH_min = 5000,
.tALS_min = 10000,
.tAR_min = 10000,
.tCEA_max = 25000,
.tCEH_min = 20000,
.tCH_min = 5000,
.tCHZ_max = 30000,
.tCLH_min = 5000,
.tCLR_min = 10000,
.tCLS_min = 10000,
.tCOH_min = 15000,
.tCS_min = 15000,
.tDH_min = 5000,
.tDS_min = 7000,
.tFEAT_max = 1000000,
.tIR_min = 0,
.tITC_max = 1000000,
.tRC_min = 20000,
.tREA_max = 16000,
.tREH_min = 7000,
.tRHOH_min = 15000,
.tRHW_min = 100000,
.tRHZ_max = 100000,
.tRLOH_min = 5000,
.tRP_min = 10000,
.tRR_min = 20000,
.tRST_max = 500000000,
.tWB_max = 100000,
.tWC_min = 20000,
.tWH_min = 7000,
.tWHR_min = 80000,
.tWP_min = 10000,
.tWW_min = 100000,
},
},
};
/**
* 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)
{
const struct nand_sdr_timings *onfi_timings;
int mode;
for (mode = ARRAY_SIZE(onfi_sdr_timings) - 1; mode > 0; mode--) {
onfi_timings = &onfi_sdr_timings[mode].timings.sdr;
if (spec_timings->tCCS_min <= onfi_timings->tCCS_min &&
spec_timings->tADL_min <= onfi_timings->tADL_min &&
spec_timings->tALH_min <= onfi_timings->tALH_min &&
spec_timings->tALS_min <= onfi_timings->tALS_min &&
spec_timings->tAR_min <= onfi_timings->tAR_min &&
spec_timings->tCEH_min <= onfi_timings->tCEH_min &&
spec_timings->tCH_min <= onfi_timings->tCH_min &&
spec_timings->tCLH_min <= onfi_timings->tCLH_min &&
spec_timings->tCLR_min <= onfi_timings->tCLR_min &&
spec_timings->tCLS_min <= onfi_timings->tCLS_min &&
spec_timings->tCOH_min <= onfi_timings->tCOH_min &&
spec_timings->tCS_min <= onfi_timings->tCS_min &&
spec_timings->tDH_min <= onfi_timings->tDH_min &&
spec_timings->tDS_min <= onfi_timings->tDS_min &&
spec_timings->tIR_min <= onfi_timings->tIR_min &&
spec_timings->tRC_min <= onfi_timings->tRC_min &&
spec_timings->tREH_min <= onfi_timings->tREH_min &&
spec_timings->tRHOH_min <= onfi_timings->tRHOH_min &&
spec_timings->tRHW_min <= onfi_timings->tRHW_min &&
spec_timings->tRLOH_min <= onfi_timings->tRLOH_min &&
spec_timings->tRP_min <= onfi_timings->tRP_min &&
spec_timings->tRR_min <= onfi_timings->tRR_min &&
spec_timings->tWC_min <= onfi_timings->tWC_min &&
spec_timings->tWH_min <= onfi_timings->tWH_min &&
spec_timings->tWHR_min <= onfi_timings->tWHR_min &&
spec_timings->tWP_min <= onfi_timings->tWP_min &&
spec_timings->tWW_min <= onfi_timings->tWW_min)
return mode;
}
return 0;
}
/**
* 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)
{
struct onfi_params *onfi = chip->parameters.onfi;
if (WARN_ON(type != NAND_SDR_IFACE))
return;
if (WARN_ON(timing_mode >= ARRAY_SIZE(onfi_sdr_timings)))
return;
*iface = onfi_sdr_timings[timing_mode];
/*
* Initialize timings that cannot be deduced from timing mode:
* tPROG, tBERS, tR and tCCS.
* These information are part of the ONFI parameter page.
*/
if (onfi) {
struct nand_sdr_timings *timings = &iface->timings.sdr;
/* microseconds -> picoseconds */
timings->tPROG_max = 1000000ULL * onfi->tPROG;
timings->tBERS_max = 1000000ULL * onfi->tBERS;
timings->tR_max = 1000000ULL * onfi->tR;
/* nanoseconds -> picoseconds */
timings->tCCS_min = 1000UL * onfi->tCCS;
}
}
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