drivers/memory/of_memory.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OpenFirmware helpers for memory drivers
   4  *
   5  * Copyright (C) 2012 Texas Instruments, Inc.
   6  * Copyright (C) 2019 Samsung Electronics Co., Ltd.
   7  * Copyright (C) 2020 Krzysztof Kozlowski <krzk@kernel.org>
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/of.h>
  12 #include <linux/gfp.h>
  13 #include <linux/export.h>
  14
  15 #include "jedec_ddr.h"
  16 #include "of_memory.h"
  17
  18 /**
  19  * of_get_min_tck() - extract min timing values for ddr
  20  * @np: pointer to ddr device tree node
  21  * @dev: device requesting for min timing values
  22  *
  23  * Populates the lpddr2_min_tck structure by extracting data
  24  * from device tree node. Returns a pointer to the populated
  25  * structure. If any error in populating the structure, returns
  26  * default min timings provided by JEDEC.
  27  */
  28 const struct lpddr2_min_tck *of_get_min_tck(struct device_node *np,
  29                                             struct device *dev)
  30 {
  31         int                     ret = 0;
  32         struct lpddr2_min_tck   *min;
  33
  34         min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
  35         if (!min)
  36                 goto default_min_tck;
  37
  38         ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
  39         ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
  40         ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
  41         ret |= of_property_read_u32(np, "tRASmin-min-tck", &min->tRASmin);
  42         ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
  43         ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
  44         ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
  45         ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
  46         ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
  47         ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
  48         ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
  49
  50         if (ret) {
  51                 devm_kfree(dev, min);
  52                 goto default_min_tck;
  53         }
  54
  55         return min;
  56
  57 default_min_tck:
  58         dev_warn(dev, "Using default min-tck values\n");
  59         return &lpddr2_jedec_min_tck;
  60 }
  61 EXPORT_SYMBOL(of_get_min_tck);
  62
  63 static int of_do_get_timings(struct device_node *np,
  64                              struct lpddr2_timings *tim)
  65 {
  66         int ret;
  67
  68         ret = of_property_read_u32(np, "max-freq", &tim->max_freq);
  69         ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
  70         ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
  71         ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
  72         ret |= of_property_read_u32(np, "tWR", &tim->tWR);
  73         ret |= of_property_read_u32(np, "tRAS-min", &tim->tRAS_min);
  74         ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
  75         ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
  76         ret |= of_property_read_u32(np, "tXP", &tim->tXP);
  77         ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
  78         ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
  79         ret |= of_property_read_u32(np, "tDQSCK-max", &tim->tDQSCK_max);
  80         ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
  81         ret |= of_property_read_u32(np, "tZQCS", &tim->tZQCS);
  82         ret |= of_property_read_u32(np, "tZQCL", &tim->tZQCL);
  83         ret |= of_property_read_u32(np, "tZQinit", &tim->tZQinit);
  84         ret |= of_property_read_u32(np, "tRAS-max-ns", &tim->tRAS_max_ns);
  85         ret |= of_property_read_u32(np, "tDQSCK-max-derated",
  86                                     &tim->tDQSCK_max_derated);
  87
  88         return ret;
  89 }
  90
  91 /**
  92  * of_get_ddr_timings() - extracts the ddr timings and updates no of
  93  * frequencies available.
  94  * @np_ddr: Pointer to ddr device tree node
  95  * @dev: Device requesting for ddr timings
  96  * @device_type: Type of ddr(LPDDR2 S2/S4)
  97  * @nr_frequencies: No of frequencies available for ddr
  98  * (updated by this function)
  99  *
 100  * Populates lpddr2_timings structure by extracting data from device
 101  * tree node. Returns pointer to populated structure. If any error
 102  * while populating, returns default timings provided by JEDEC.
 103  */
 104 const struct lpddr2_timings *of_get_ddr_timings(struct device_node *np_ddr,
 105                                                 struct device *dev,
 106                                                 u32 device_type,
 107                                                 u32 *nr_frequencies)
 108 {
 109         struct lpddr2_timings   *timings = NULL;
 110         u32                     arr_sz = 0, i = 0;
 111         struct device_node      *np_tim;
 112         char                    *tim_compat = NULL;
 113
 114         switch (device_type) {
 115         case DDR_TYPE_LPDDR2_S2:
 116         case DDR_TYPE_LPDDR2_S4:
 117                 tim_compat = "jedec,lpddr2-timings";
 118                 break;
 119         default:
 120                 dev_warn(dev, "Unsupported memory type\n");
 121         }
 122
 123         for_each_child_of_node(np_ddr, np_tim)
 124                 if (of_device_is_compatible(np_tim, tim_compat))
 125                         arr_sz++;
 126
 127         if (arr_sz)
 128                 timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
 129                                        GFP_KERNEL);
 130
 131         if (!timings)
 132                 goto default_timings;
 133
 134         for_each_child_of_node(np_ddr, np_tim) {
 135                 if (of_device_is_compatible(np_tim, tim_compat)) {
 136                         if (of_do_get_timings(np_tim, &timings[i])) {
 137                                 devm_kfree(dev, timings);
 138                                 goto default_timings;
 139                         }
 140                         i++;
 141                 }
 142         }
 143
 144         *nr_frequencies = arr_sz;
 145
 146         return timings;
 147
 148 default_timings:
 149         dev_warn(dev, "Using default memory timings\n");
 150         *nr_frequencies = ARRAY_SIZE(lpddr2_jedec_timings);
 151         return lpddr2_jedec_timings;
 152 }
 153 EXPORT_SYMBOL(of_get_ddr_timings);
 154
 155 /**
 156  * of_lpddr3_get_min_tck() - extract min timing values for lpddr3
 157  * @np: pointer to ddr device tree node
 158  * @dev: device requesting for min timing values
 159  *
 160  * Populates the lpddr3_min_tck structure by extracting data
 161  * from device tree node. Returns a pointer to the populated
 162  * structure. If any error in populating the structure, returns NULL.
 163  */
 164 const struct lpddr3_min_tck *of_lpddr3_get_min_tck(struct device_node *np,
 165                                                    struct device *dev)
 166 {
 167         int                     ret = 0;
 168         struct lpddr3_min_tck   *min;
 169
 170         min = devm_kzalloc(dev, sizeof(*min), GFP_KERNEL);
 171         if (!min)
 172                 goto default_min_tck;
 173
 174         ret |= of_property_read_u32(np, "tRFC-min-tck", &min->tRFC);
 175         ret |= of_property_read_u32(np, "tRRD-min-tck", &min->tRRD);
 176         ret |= of_property_read_u32(np, "tRPab-min-tck", &min->tRPab);
 177         ret |= of_property_read_u32(np, "tRPpb-min-tck", &min->tRPpb);
 178         ret |= of_property_read_u32(np, "tRCD-min-tck", &min->tRCD);
 179         ret |= of_property_read_u32(np, "tRC-min-tck", &min->tRC);
 180         ret |= of_property_read_u32(np, "tRAS-min-tck", &min->tRAS);
 181         ret |= of_property_read_u32(np, "tWTR-min-tck", &min->tWTR);
 182         ret |= of_property_read_u32(np, "tWR-min-tck", &min->tWR);
 183         ret |= of_property_read_u32(np, "tRTP-min-tck", &min->tRTP);
 184         ret |= of_property_read_u32(np, "tW2W-C2C-min-tck", &min->tW2W_C2C);
 185         ret |= of_property_read_u32(np, "tR2R-C2C-min-tck", &min->tR2R_C2C);
 186         ret |= of_property_read_u32(np, "tWL-min-tck", &min->tWL);
 187         ret |= of_property_read_u32(np, "tDQSCK-min-tck", &min->tDQSCK);
 188         ret |= of_property_read_u32(np, "tRL-min-tck", &min->tRL);
 189         ret |= of_property_read_u32(np, "tFAW-min-tck", &min->tFAW);
 190         ret |= of_property_read_u32(np, "tXSR-min-tck", &min->tXSR);
 191         ret |= of_property_read_u32(np, "tXP-min-tck", &min->tXP);
 192         ret |= of_property_read_u32(np, "tCKE-min-tck", &min->tCKE);
 193         ret |= of_property_read_u32(np, "tCKESR-min-tck", &min->tCKESR);
 194         ret |= of_property_read_u32(np, "tMRD-min-tck", &min->tMRD);
 195
 196         if (ret) {
 197                 dev_warn(dev, "Errors while parsing min-tck values\n");
 198                 devm_kfree(dev, min);
 199                 goto default_min_tck;
 200         }
 201
 202         return min;
 203
 204 default_min_tck:
 205         dev_warn(dev, "Using default min-tck values\n");
 206         return NULL;
 207 }
 208 EXPORT_SYMBOL(of_lpddr3_get_min_tck);
 209
 210 static int of_lpddr3_do_get_timings(struct device_node *np,
 211                                     struct lpddr3_timings *tim)
 212 {
 213         int ret;
 214
 215         /* The 'reg' param required since DT has changed, used as 'max-freq' */
 216         ret = of_property_read_u32(np, "reg", &tim->max_freq);
 217         ret |= of_property_read_u32(np, "min-freq", &tim->min_freq);
 218         ret |= of_property_read_u32(np, "tRFC", &tim->tRFC);
 219         ret |= of_property_read_u32(np, "tRRD", &tim->tRRD);
 220         ret |= of_property_read_u32(np, "tRPab", &tim->tRPab);
 221         ret |= of_property_read_u32(np, "tRPpb", &tim->tRPpb);
 222         ret |= of_property_read_u32(np, "tRCD", &tim->tRCD);
 223         ret |= of_property_read_u32(np, "tRC", &tim->tRC);
 224         ret |= of_property_read_u32(np, "tRAS", &tim->tRAS);
 225         ret |= of_property_read_u32(np, "tWTR", &tim->tWTR);
 226         ret |= of_property_read_u32(np, "tWR", &tim->tWR);
 227         ret |= of_property_read_u32(np, "tRTP", &tim->tRTP);
 228         ret |= of_property_read_u32(np, "tW2W-C2C", &tim->tW2W_C2C);
 229         ret |= of_property_read_u32(np, "tR2R-C2C", &tim->tR2R_C2C);
 230         ret |= of_property_read_u32(np, "tFAW", &tim->tFAW);
 231         ret |= of_property_read_u32(np, "tXSR", &tim->tXSR);
 232         ret |= of_property_read_u32(np, "tXP", &tim->tXP);
 233         ret |= of_property_read_u32(np, "tCKE", &tim->tCKE);
 234         ret |= of_property_read_u32(np, "tCKESR", &tim->tCKESR);
 235         ret |= of_property_read_u32(np, "tMRD", &tim->tMRD);
 236
 237         return ret;
 238 }
 239
 240 /**
 241  * of_lpddr3_get_ddr_timings() - extracts the lpddr3 timings and updates no of
 242  * frequencies available.
 243  * @np_ddr: Pointer to ddr device tree node
 244  * @dev: Device requesting for ddr timings
 245  * @device_type: Type of ddr
 246  * @nr_frequencies: No of frequencies available for ddr
 247  * (updated by this function)
 248  *
 249  * Populates lpddr3_timings structure by extracting data from device
 250  * tree node. Returns pointer to populated structure. If any error
 251  * while populating, returns NULL.
 252  */
 253 const struct lpddr3_timings
 254 *of_lpddr3_get_ddr_timings(struct device_node *np_ddr, struct device *dev,
 255                            u32 device_type, u32 *nr_frequencies)
 256 {
 257         struct lpddr3_timings   *timings = NULL;
 258         u32                     arr_sz = 0, i = 0;
 259         struct device_node      *np_tim;
 260         char                    *tim_compat = NULL;
 261
 262         switch (device_type) {
 263         case DDR_TYPE_LPDDR3:
 264                 tim_compat = "jedec,lpddr3-timings";
 265                 break;
 266         default:
 267                 dev_warn(dev, "Unsupported memory type\n");
 268         }
 269
 270         for_each_child_of_node(np_ddr, np_tim)
 271                 if (of_device_is_compatible(np_tim, tim_compat))
 272                         arr_sz++;
 273
 274         if (arr_sz)
 275                 timings = devm_kcalloc(dev, arr_sz, sizeof(*timings),
 276                                        GFP_KERNEL);
 277
 278         if (!timings)
 279                 goto default_timings;
 280
 281         for_each_child_of_node(np_ddr, np_tim) {
 282                 if (of_device_is_compatible(np_tim, tim_compat)) {
 283                         if (of_lpddr3_do_get_timings(np_tim, &timings[i])) {
 284                                 devm_kfree(dev, timings);
 285                                 goto default_timings;
 286                         }
 287                         i++;
 288                 }
 289         }
 290
 291         *nr_frequencies = arr_sz;
 292
 293         return timings;
 294
 295 default_timings:
 296         dev_warn(dev, "Failed to get timings\n");
 297         *nr_frequencies = 0;
 298         return NULL;
 299 }
 300 EXPORT_SYMBOL(of_lpddr3_get_ddr_timings);