drivers/mtd/nand/nand_timings.c

   1 /*
   2  *  Copyright (C) 2014 Free Electrons
   3  *
   4  *  Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/err.h>
  13 #include <linux/export.h>
  14 #include <linux/mtd/nand.h>
  15
  16 static const struct nand_data_interface onfi_sdr_timings[] = {
  17         /* Mode 0 */
  18         {
  19                 .type = NAND_SDR_IFACE,
  20                 .timings.sdr = {
  21                         .tADL_min = 400000,
  22                         .tALH_min = 20000,
  23                         .tALS_min = 50000,
  24                         .tAR_min = 25000,
  25                         .tCEA_max = 100000,
  26                         .tCEH_min = 20000,
  27                         .tCH_min = 20000,
  28                         .tCHZ_max = 100000,
  29                         .tCLH_min = 20000,
  30                         .tCLR_min = 20000,
  31                         .tCLS_min = 50000,
  32                         .tCOH_min = 0,
  33                         .tCS_min = 70000,
  34                         .tDH_min = 20000,
  35                         .tDS_min = 40000,
  36                         .tFEAT_max = 1000000,
  37                         .tIR_min = 10000,
  38                         .tITC_max = 1000000,
  39                         .tRC_min = 100000,
  40                         .tREA_max = 40000,
  41                         .tREH_min = 30000,
  42                         .tRHOH_min = 0,
  43                         .tRHW_min = 200000,
  44                         .tRHZ_max = 200000,
  45                         .tRLOH_min = 0,
  46                         .tRP_min = 50000,
  47                         .tRR_min = 40000,
  48                         .tRST_max = 250000000000ULL,
  49                         .tWB_max = 200000,
  50                         .tWC_min = 100000,
  51                         .tWH_min = 30000,
  52                         .tWHR_min = 120000,
  53                         .tWP_min = 50000,
  54                         .tWW_min = 100000,
  55                 },
  56         },
  57         /* Mode 1 */
  58         {
  59                 .type = NAND_SDR_IFACE,
  60                 .timings.sdr = {
  61                         .tADL_min = 400000,
  62                         .tALH_min = 10000,
  63                         .tALS_min = 25000,
  64                         .tAR_min = 10000,
  65                         .tCEA_max = 45000,
  66                         .tCEH_min = 20000,
  67                         .tCH_min = 10000,
  68                         .tCHZ_max = 50000,
  69                         .tCLH_min = 10000,
  70                         .tCLR_min = 10000,
  71                         .tCLS_min = 25000,
  72                         .tCOH_min = 15000,
  73                         .tCS_min = 35000,
  74                         .tDH_min = 10000,
  75                         .tDS_min = 20000,
  76                         .tFEAT_max = 1000000,
  77                         .tIR_min = 0,
  78                         .tITC_max = 1000000,
  79                         .tRC_min = 50000,
  80                         .tREA_max = 30000,
  81                         .tREH_min = 15000,
  82                         .tRHOH_min = 15000,
  83                         .tRHW_min = 100000,
  84                         .tRHZ_max = 100000,
  85                         .tRLOH_min = 0,
  86                         .tRP_min = 25000,
  87                         .tRR_min = 20000,
  88                         .tRST_max = 500000000,
  89                         .tWB_max = 100000,
  90                         .tWC_min = 45000,
  91                         .tWH_min = 15000,
  92                         .tWHR_min = 80000,
  93                         .tWP_min = 25000,
  94                         .tWW_min = 100000,
  95                 },
  96         },
  97         /* Mode 2 */
  98         {
  99                 .type = NAND_SDR_IFACE,
 100                 .timings.sdr = {
 101                         .tADL_min = 400000,
 102                         .tALH_min = 10000,
 103                         .tALS_min = 15000,
 104                         .tAR_min = 10000,
 105                         .tCEA_max = 30000,
 106                         .tCEH_min = 20000,
 107                         .tCH_min = 10000,
 108                         .tCHZ_max = 50000,
 109                         .tCLH_min = 10000,
 110                         .tCLR_min = 10000,
 111                         .tCLS_min = 15000,
 112                         .tCOH_min = 15000,
 113                         .tCS_min = 25000,
 114                         .tDH_min = 5000,
 115                         .tDS_min = 15000,
 116                         .tFEAT_max = 1000000,
 117                         .tIR_min = 0,
 118                         .tITC_max = 1000000,
 119                         .tRC_min = 35000,
 120                         .tREA_max = 25000,
 121                         .tREH_min = 15000,
 122                         .tRHOH_min = 15000,
 123                         .tRHW_min = 100000,
 124                         .tRHZ_max = 100000,
 125                         .tRLOH_min = 0,
 126                         .tRR_min = 20000,
 127                         .tRST_max = 500000000,
 128                         .tWB_max = 100000,
 129                         .tRP_min = 17000,
 130                         .tWC_min = 35000,
 131                         .tWH_min = 15000,
 132                         .tWHR_min = 80000,
 133                         .tWP_min = 17000,
 134                         .tWW_min = 100000,
 135                 },
 136         },
 137         /* Mode 3 */
 138         {
 139                 .type = NAND_SDR_IFACE,
 140                 .timings.sdr = {
 141                         .tADL_min = 400000,
 142                         .tALH_min = 5000,
 143                         .tALS_min = 10000,
 144                         .tAR_min = 10000,
 145                         .tCEA_max = 25000,
 146                         .tCEH_min = 20000,
 147                         .tCH_min = 5000,
 148                         .tCHZ_max = 50000,
 149                         .tCLH_min = 5000,
 150                         .tCLR_min = 10000,
 151                         .tCLS_min = 10000,
 152                         .tCOH_min = 15000,
 153                         .tCS_min = 25000,
 154                         .tDH_min = 5000,
 155                         .tDS_min = 10000,
 156                         .tFEAT_max = 1000000,
 157                         .tIR_min = 0,
 158                         .tITC_max = 1000000,
 159                         .tRC_min = 30000,
 160                         .tREA_max = 20000,
 161                         .tREH_min = 10000,
 162                         .tRHOH_min = 15000,
 163                         .tRHW_min = 100000,
 164                         .tRHZ_max = 100000,
 165                         .tRLOH_min = 0,
 166                         .tRP_min = 15000,
 167                         .tRR_min = 20000,
 168                         .tRST_max = 500000000,
 169                         .tWB_max = 100000,
 170                         .tWC_min = 30000,
 171                         .tWH_min = 10000,
 172                         .tWHR_min = 80000,
 173                         .tWP_min = 15000,
 174                         .tWW_min = 100000,
 175                 },
 176         },
 177         /* Mode 4 */
 178         {
 179                 .type = NAND_SDR_IFACE,
 180                 .timings.sdr = {
 181                         .tADL_min = 400000,
 182                         .tALH_min = 5000,
 183                         .tALS_min = 10000,
 184                         .tAR_min = 10000,
 185                         .tCEA_max = 25000,
 186                         .tCEH_min = 20000,
 187                         .tCH_min = 5000,
 188                         .tCHZ_max = 30000,
 189                         .tCLH_min = 5000,
 190                         .tCLR_min = 10000,
 191                         .tCLS_min = 10000,
 192                         .tCOH_min = 15000,
 193                         .tCS_min = 20000,
 194                         .tDH_min = 5000,
 195                         .tDS_min = 10000,
 196                         .tFEAT_max = 1000000,
 197                         .tIR_min = 0,
 198                         .tITC_max = 1000000,
 199                         .tRC_min = 25000,
 200                         .tREA_max = 20000,
 201                         .tREH_min = 10000,
 202                         .tRHOH_min = 15000,
 203                         .tRHW_min = 100000,
 204                         .tRHZ_max = 100000,
 205                         .tRLOH_min = 5000,
 206                         .tRP_min = 12000,
 207                         .tRR_min = 20000,
 208                         .tRST_max = 500000000,
 209                         .tWB_max = 100000,
 210                         .tWC_min = 25000,
 211                         .tWH_min = 10000,
 212                         .tWHR_min = 80000,
 213                         .tWP_min = 12000,
 214                         .tWW_min = 100000,
 215                 },
 216         },
 217         /* Mode 5 */
 218         {
 219                 .type = NAND_SDR_IFACE,
 220                 .timings.sdr = {
 221                         .tADL_min = 400000,
 222                         .tALH_min = 5000,
 223                         .tALS_min = 10000,
 224                         .tAR_min = 10000,
 225                         .tCEA_max = 25000,
 226                         .tCEH_min = 20000,
 227                         .tCH_min = 5000,
 228                         .tCHZ_max = 30000,
 229                         .tCLH_min = 5000,
 230                         .tCLR_min = 10000,
 231                         .tCLS_min = 10000,
 232                         .tCOH_min = 15000,
 233                         .tCS_min = 15000,
 234                         .tDH_min = 5000,
 235                         .tDS_min = 7000,
 236                         .tFEAT_max = 1000000,
 237                         .tIR_min = 0,
 238                         .tITC_max = 1000000,
 239                         .tRC_min = 20000,
 240                         .tREA_max = 16000,
 241                         .tREH_min = 7000,
 242                         .tRHOH_min = 15000,
 243                         .tRHW_min = 100000,
 244                         .tRHZ_max = 100000,
 245                         .tRLOH_min = 5000,
 246                         .tRP_min = 10000,
 247                         .tRR_min = 20000,
 248                         .tRST_max = 500000000,
 249                         .tWB_max = 100000,
 250                         .tWC_min = 20000,
 251                         .tWH_min = 7000,
 252                         .tWHR_min = 80000,
 253                         .tWP_min = 10000,
 254                         .tWW_min = 100000,
 255                 },
 256         },
 257 };
 258
 259 /**
 260  * onfi_async_timing_mode_to_sdr_timings - [NAND Interface] Retrieve NAND
 261  * timings according to the given ONFI timing mode
 262  * @mode: ONFI timing mode
 263  */
 264 const struct nand_sdr_timings *onfi_async_timing_mode_to_sdr_timings(int mode)
 265 {
 266         if (mode < 0 || mode >= ARRAY_SIZE(onfi_sdr_timings))
 267                 return ERR_PTR(-EINVAL);
 268
 269         return &onfi_sdr_timings[mode].timings.sdr;
 270 }
 271 EXPORT_SYMBOL(onfi_async_timing_mode_to_sdr_timings);
 272
 273 /**
 274  * onfi_init_data_interface - [NAND Interface] Initialize a data interface from
 275  * given ONFI mode
 276  * @iface: The data interface to be initialized
 277  * @mode: The ONFI timing mode
 278  */
 279 int onfi_init_data_interface(struct nand_chip *chip,
 280                              struct nand_data_interface *iface,
 281                              enum nand_data_interface_type type,
 282                              int timing_mode)
 283 {
 284         if (type != NAND_SDR_IFACE)
 285                 return -EINVAL;
 286
 287         if (timing_mode < 0 || timing_mode >= ARRAY_SIZE(onfi_sdr_timings))
 288                 return -EINVAL;
 289
 290         *iface = onfi_sdr_timings[timing_mode];
 291
 292         /*
 293          * TODO: initialize timings that cannot be deduced from timing mode:
 294          * tR, tPROG, tCCS, ...
 295          * These information are part of the ONFI parameter page.
 296          */
 297
 298         return 0;
 299 }
 300 EXPORT_SYMBOL(onfi_init_data_interface);
 301
 302 /**
 303  * nand_get_default_data_interface - [NAND Interface] Retrieve NAND
 304  * data interface for mode 0. This is used as default timing after
 305  * reset.
 306  */
 307 const struct nand_data_interface *nand_get_default_data_interface(void)
 308 {
 309         return &onfi_sdr_timings[0];
 310 }
 311 EXPORT_SYMBOL(nand_get_default_data_interface);