drivers/memory/tegra/tegra124-emc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
   4  *
   5  * Author:
   6  *      Mikko Perttunen <mperttunen@nvidia.com>
   7  */
   8
   9 #include <linux/clk-provider.h>
  10 #include <linux/clk.h>
  11 #include <linux/clkdev.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/delay.h>
  14 #include <linux/io.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/sort.h>
  19 #include <linux/string.h>
  20
  21 #include <soc/tegra/emc.h>
  22 #include <soc/tegra/fuse.h>
  23 #include <soc/tegra/mc.h>
  24
  25 #define EMC_FBIO_CFG5                           0x104
  26 #define EMC_FBIO_CFG5_DRAM_TYPE_MASK            0x3
  27 #define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT           0
  28
  29 #define EMC_INTSTATUS                           0x0
  30 #define EMC_INTSTATUS_CLKCHANGE_COMPLETE        BIT(4)
  31
  32 #define EMC_CFG                                 0xc
  33 #define EMC_CFG_DRAM_CLKSTOP_PD                 BIT(31)
  34 #define EMC_CFG_DRAM_CLKSTOP_SR                 BIT(30)
  35 #define EMC_CFG_DRAM_ACPD                       BIT(29)
  36 #define EMC_CFG_DYN_SREF                        BIT(28)
  37 #define EMC_CFG_PWR_MASK                        ((0xF << 28) | BIT(18))
  38 #define EMC_CFG_DSR_VTTGEN_DRV_EN               BIT(18)
  39
  40 #define EMC_REFCTRL                             0x20
  41 #define EMC_REFCTRL_DEV_SEL_SHIFT               0
  42 #define EMC_REFCTRL_ENABLE                      BIT(31)
  43
  44 #define EMC_TIMING_CONTROL                      0x28
  45 #define EMC_RC                                  0x2c
  46 #define EMC_RFC                                 0x30
  47 #define EMC_RAS                                 0x34
  48 #define EMC_RP                                  0x38
  49 #define EMC_R2W                                 0x3c
  50 #define EMC_W2R                                 0x40
  51 #define EMC_R2P                                 0x44
  52 #define EMC_W2P                                 0x48
  53 #define EMC_RD_RCD                              0x4c
  54 #define EMC_WR_RCD                              0x50
  55 #define EMC_RRD                                 0x54
  56 #define EMC_REXT                                0x58
  57 #define EMC_WDV                                 0x5c
  58 #define EMC_QUSE                                0x60
  59 #define EMC_QRST                                0x64
  60 #define EMC_QSAFE                               0x68
  61 #define EMC_RDV                                 0x6c
  62 #define EMC_REFRESH                             0x70
  63 #define EMC_BURST_REFRESH_NUM                   0x74
  64 #define EMC_PDEX2WR                             0x78
  65 #define EMC_PDEX2RD                             0x7c
  66 #define EMC_PCHG2PDEN                           0x80
  67 #define EMC_ACT2PDEN                            0x84
  68 #define EMC_AR2PDEN                             0x88
  69 #define EMC_RW2PDEN                             0x8c
  70 #define EMC_TXSR                                0x90
  71 #define EMC_TCKE                                0x94
  72 #define EMC_TFAW                                0x98
  73 #define EMC_TRPAB                               0x9c
  74 #define EMC_TCLKSTABLE                          0xa0
  75 #define EMC_TCLKSTOP                            0xa4
  76 #define EMC_TREFBW                              0xa8
  77 #define EMC_ODT_WRITE                           0xb0
  78 #define EMC_ODT_READ                            0xb4
  79 #define EMC_WEXT                                0xb8
  80 #define EMC_CTT                                 0xbc
  81 #define EMC_RFC_SLR                             0xc0
  82 #define EMC_MRS_WAIT_CNT2                       0xc4
  83
  84 #define EMC_MRS_WAIT_CNT                        0xc8
  85 #define EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT       0
  86 #define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK        \
  87         (0x3FF << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT)
  88 #define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT        16
  89 #define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK         \
  90         (0x3FF << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
  91
  92 #define EMC_MRS                                 0xcc
  93 #define EMC_MODE_SET_DLL_RESET                  BIT(8)
  94 #define EMC_MODE_SET_LONG_CNT                   BIT(26)
  95 #define EMC_EMRS                                0xd0
  96 #define EMC_REF                                 0xd4
  97 #define EMC_PRE                                 0xd8
  98
  99 #define EMC_SELF_REF                            0xe0
 100 #define EMC_SELF_REF_CMD_ENABLED                BIT(0)
 101 #define EMC_SELF_REF_DEV_SEL_SHIFT              30
 102
 103 #define EMC_MRW                                 0xe8
 104
 105 #define EMC_MRR                                 0xec
 106 #define EMC_MRR_MA_SHIFT                        16
 107 #define LPDDR2_MR4_TEMP_SHIFT                   0
 108
 109 #define EMC_XM2DQSPADCTRL3                      0xf8
 110 #define EMC_FBIO_SPARE                          0x100
 111
 112 #define EMC_FBIO_CFG6                           0x114
 113 #define EMC_EMRS2                               0x12c
 114 #define EMC_MRW2                                0x134
 115 #define EMC_MRW4                                0x13c
 116 #define EMC_EINPUT                              0x14c
 117 #define EMC_EINPUT_DURATION                     0x150
 118 #define EMC_PUTERM_EXTRA                        0x154
 119 #define EMC_TCKESR                              0x158
 120 #define EMC_TPD                                 0x15c
 121
 122 #define EMC_AUTO_CAL_CONFIG                     0x2a4
 123 #define EMC_AUTO_CAL_CONFIG_AUTO_CAL_START      BIT(31)
 124 #define EMC_AUTO_CAL_INTERVAL                   0x2a8
 125 #define EMC_AUTO_CAL_STATUS                     0x2ac
 126 #define EMC_AUTO_CAL_STATUS_ACTIVE              BIT(31)
 127 #define EMC_STATUS                              0x2b4
 128 #define EMC_STATUS_TIMING_UPDATE_STALLED        BIT(23)
 129
 130 #define EMC_CFG_2                               0x2b8
 131 #define EMC_CFG_2_MODE_SHIFT                    0
 132 #define EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR  BIT(6)
 133
 134 #define EMC_CFG_DIG_DLL                         0x2bc
 135 #define EMC_CFG_DIG_DLL_PERIOD                  0x2c0
 136 #define EMC_RDV_MASK                            0x2cc
 137 #define EMC_WDV_MASK                            0x2d0
 138 #define EMC_CTT_DURATION                        0x2d8
 139 #define EMC_CTT_TERM_CTRL                       0x2dc
 140 #define EMC_ZCAL_INTERVAL                       0x2e0
 141 #define EMC_ZCAL_WAIT_CNT                       0x2e4
 142
 143 #define EMC_ZQ_CAL                              0x2ec
 144 #define EMC_ZQ_CAL_CMD                          BIT(0)
 145 #define EMC_ZQ_CAL_LONG                         BIT(4)
 146 #define EMC_ZQ_CAL_LONG_CMD_DEV0                \
 147         (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
 148 #define EMC_ZQ_CAL_LONG_CMD_DEV1                \
 149         (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD)
 150
 151 #define EMC_XM2CMDPADCTRL                       0x2f0
 152 #define EMC_XM2DQSPADCTRL                       0x2f8
 153 #define EMC_XM2DQSPADCTRL2                      0x2fc
 154 #define EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE     BIT(0)
 155 #define EMC_XM2DQSPADCTRL2_VREF_ENABLE          BIT(5)
 156 #define EMC_XM2DQPADCTRL                        0x300
 157 #define EMC_XM2DQPADCTRL2                       0x304
 158 #define EMC_XM2CLKPADCTRL                       0x308
 159 #define EMC_XM2COMPPADCTRL                      0x30c
 160 #define EMC_XM2VTTGENPADCTRL                    0x310
 161 #define EMC_XM2VTTGENPADCTRL2                   0x314
 162 #define EMC_XM2VTTGENPADCTRL3                   0x318
 163 #define EMC_XM2DQSPADCTRL4                      0x320
 164 #define EMC_DLL_XFORM_DQS0                      0x328
 165 #define EMC_DLL_XFORM_DQS1                      0x32c
 166 #define EMC_DLL_XFORM_DQS2                      0x330
 167 #define EMC_DLL_XFORM_DQS3                      0x334
 168 #define EMC_DLL_XFORM_DQS4                      0x338
 169 #define EMC_DLL_XFORM_DQS5                      0x33c
 170 #define EMC_DLL_XFORM_DQS6                      0x340
 171 #define EMC_DLL_XFORM_DQS7                      0x344
 172 #define EMC_DLL_XFORM_QUSE0                     0x348
 173 #define EMC_DLL_XFORM_QUSE1                     0x34c
 174 #define EMC_DLL_XFORM_QUSE2                     0x350
 175 #define EMC_DLL_XFORM_QUSE3                     0x354
 176 #define EMC_DLL_XFORM_QUSE4                     0x358
 177 #define EMC_DLL_XFORM_QUSE5                     0x35c
 178 #define EMC_DLL_XFORM_QUSE6                     0x360
 179 #define EMC_DLL_XFORM_QUSE7                     0x364
 180 #define EMC_DLL_XFORM_DQ0                       0x368
 181 #define EMC_DLL_XFORM_DQ1                       0x36c
 182 #define EMC_DLL_XFORM_DQ2                       0x370
 183 #define EMC_DLL_XFORM_DQ3                       0x374
 184 #define EMC_DLI_TRIM_TXDQS0                     0x3a8
 185 #define EMC_DLI_TRIM_TXDQS1                     0x3ac
 186 #define EMC_DLI_TRIM_TXDQS2                     0x3b0
 187 #define EMC_DLI_TRIM_TXDQS3                     0x3b4
 188 #define EMC_DLI_TRIM_TXDQS4                     0x3b8
 189 #define EMC_DLI_TRIM_TXDQS5                     0x3bc
 190 #define EMC_DLI_TRIM_TXDQS6                     0x3c0
 191 #define EMC_DLI_TRIM_TXDQS7                     0x3c4
 192 #define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE      0x3cc
 193 #define EMC_SEL_DPD_CTRL                        0x3d8
 194 #define EMC_SEL_DPD_CTRL_DATA_SEL_DPD           BIT(8)
 195 #define EMC_SEL_DPD_CTRL_ODT_SEL_DPD            BIT(5)
 196 #define EMC_SEL_DPD_CTRL_RESET_SEL_DPD          BIT(4)
 197 #define EMC_SEL_DPD_CTRL_CA_SEL_DPD             BIT(3)
 198 #define EMC_SEL_DPD_CTRL_CLK_SEL_DPD            BIT(2)
 199 #define EMC_SEL_DPD_CTRL_DDR3_MASK      \
 200         ((0xf << 2) | BIT(8))
 201 #define EMC_SEL_DPD_CTRL_MASK \
 202         ((0x3 << 2) | BIT(5) | BIT(8))
 203 #define EMC_PRE_REFRESH_REQ_CNT                 0x3dc
 204 #define EMC_DYN_SELF_REF_CONTROL                0x3e0
 205 #define EMC_TXSRDLL                             0x3e4
 206 #define EMC_CCFIFO_ADDR                         0x3e8
 207 #define EMC_CCFIFO_DATA                         0x3ec
 208 #define EMC_CCFIFO_STATUS                       0x3f0
 209 #define EMC_CDB_CNTL_1                          0x3f4
 210 #define EMC_CDB_CNTL_2                          0x3f8
 211 #define EMC_XM2CLKPADCTRL2                      0x3fc
 212 #define EMC_AUTO_CAL_CONFIG2                    0x458
 213 #define EMC_AUTO_CAL_CONFIG3                    0x45c
 214 #define EMC_IBDLY                               0x468
 215 #define EMC_DLL_XFORM_ADDR0                     0x46c
 216 #define EMC_DLL_XFORM_ADDR1                     0x470
 217 #define EMC_DLL_XFORM_ADDR2                     0x474
 218 #define EMC_DSR_VTTGEN_DRV                      0x47c
 219 #define EMC_TXDSRVTTGEN                         0x480
 220 #define EMC_XM2CMDPADCTRL4                      0x484
 221 #define EMC_XM2CMDPADCTRL5                      0x488
 222 #define EMC_DLL_XFORM_DQS8                      0x4a0
 223 #define EMC_DLL_XFORM_DQS9                      0x4a4
 224 #define EMC_DLL_XFORM_DQS10                     0x4a8
 225 #define EMC_DLL_XFORM_DQS11                     0x4ac
 226 #define EMC_DLL_XFORM_DQS12                     0x4b0
 227 #define EMC_DLL_XFORM_DQS13                     0x4b4
 228 #define EMC_DLL_XFORM_DQS14                     0x4b8
 229 #define EMC_DLL_XFORM_DQS15                     0x4bc
 230 #define EMC_DLL_XFORM_QUSE8                     0x4c0
 231 #define EMC_DLL_XFORM_QUSE9                     0x4c4
 232 #define EMC_DLL_XFORM_QUSE10                    0x4c8
 233 #define EMC_DLL_XFORM_QUSE11                    0x4cc
 234 #define EMC_DLL_XFORM_QUSE12                    0x4d0
 235 #define EMC_DLL_XFORM_QUSE13                    0x4d4
 236 #define EMC_DLL_XFORM_QUSE14                    0x4d8
 237 #define EMC_DLL_XFORM_QUSE15                    0x4dc
 238 #define EMC_DLL_XFORM_DQ4                       0x4e0
 239 #define EMC_DLL_XFORM_DQ5                       0x4e4
 240 #define EMC_DLL_XFORM_DQ6                       0x4e8
 241 #define EMC_DLL_XFORM_DQ7                       0x4ec
 242 #define EMC_DLI_TRIM_TXDQS8                     0x520
 243 #define EMC_DLI_TRIM_TXDQS9                     0x524
 244 #define EMC_DLI_TRIM_TXDQS10                    0x528
 245 #define EMC_DLI_TRIM_TXDQS11                    0x52c
 246 #define EMC_DLI_TRIM_TXDQS12                    0x530
 247 #define EMC_DLI_TRIM_TXDQS13                    0x534
 248 #define EMC_DLI_TRIM_TXDQS14                    0x538
 249 #define EMC_DLI_TRIM_TXDQS15                    0x53c
 250 #define EMC_CDB_CNTL_3                          0x540
 251 #define EMC_XM2DQSPADCTRL5                      0x544
 252 #define EMC_XM2DQSPADCTRL6                      0x548
 253 #define EMC_XM2DQPADCTRL3                       0x54c
 254 #define EMC_DLL_XFORM_ADDR3                     0x550
 255 #define EMC_DLL_XFORM_ADDR4                     0x554
 256 #define EMC_DLL_XFORM_ADDR5                     0x558
 257 #define EMC_CFG_PIPE                            0x560
 258 #define EMC_QPOP                                0x564
 259 #define EMC_QUSE_WIDTH                          0x568
 260 #define EMC_PUTERM_WIDTH                        0x56c
 261 #define EMC_BGBIAS_CTL0                         0x570
 262 #define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX BIT(3)
 263 #define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN BIT(2)
 264 #define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD        BIT(1)
 265 #define EMC_PUTERM_ADJ                          0x574
 266
 267 #define DRAM_DEV_SEL_ALL                        0
 268 #define DRAM_DEV_SEL_0                          (2 << 30)
 269 #define DRAM_DEV_SEL_1                          (1 << 30)
 270
 271 #define EMC_CFG_POWER_FEATURES_MASK             \
 272         (EMC_CFG_DYN_SREF | EMC_CFG_DRAM_ACPD | EMC_CFG_DRAM_CLKSTOP_SR | \
 273         EMC_CFG_DRAM_CLKSTOP_PD | EMC_CFG_DSR_VTTGEN_DRV_EN)
 274 #define EMC_REFCTRL_DEV_SEL(n) (((n > 1) ? 0 : 2) << EMC_REFCTRL_DEV_SEL_SHIFT)
 275 #define EMC_DRAM_DEV_SEL(n) ((n > 1) ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0)
 276
 277 /* Maximum amount of time in us. to wait for changes to become effective */
 278 #define EMC_STATUS_UPDATE_TIMEOUT               1000
 279
 280 enum emc_dram_type {
 281         DRAM_TYPE_DDR3 = 0,
 282         DRAM_TYPE_DDR1 = 1,
 283         DRAM_TYPE_LPDDR3 = 2,
 284         DRAM_TYPE_DDR2 = 3
 285 };
 286
 287 enum emc_dll_change {
 288         DLL_CHANGE_NONE,
 289         DLL_CHANGE_ON,
 290         DLL_CHANGE_OFF
 291 };
 292
 293 static const unsigned long emc_burst_regs[] = {
 294         EMC_RC,
 295         EMC_RFC,
 296         EMC_RFC_SLR,
 297         EMC_RAS,
 298         EMC_RP,
 299         EMC_R2W,
 300         EMC_W2R,
 301         EMC_R2P,
 302         EMC_W2P,
 303         EMC_RD_RCD,
 304         EMC_WR_RCD,
 305         EMC_RRD,
 306         EMC_REXT,
 307         EMC_WEXT,
 308         EMC_WDV,
 309         EMC_WDV_MASK,
 310         EMC_QUSE,
 311         EMC_QUSE_WIDTH,
 312         EMC_IBDLY,
 313         EMC_EINPUT,
 314         EMC_EINPUT_DURATION,
 315         EMC_PUTERM_EXTRA,
 316         EMC_PUTERM_WIDTH,
 317         EMC_PUTERM_ADJ,
 318         EMC_CDB_CNTL_1,
 319         EMC_CDB_CNTL_2,
 320         EMC_CDB_CNTL_3,
 321         EMC_QRST,
 322         EMC_QSAFE,
 323         EMC_RDV,
 324         EMC_RDV_MASK,
 325         EMC_REFRESH,
 326         EMC_BURST_REFRESH_NUM,
 327         EMC_PRE_REFRESH_REQ_CNT,
 328         EMC_PDEX2WR,
 329         EMC_PDEX2RD,
 330         EMC_PCHG2PDEN,
 331         EMC_ACT2PDEN,
 332         EMC_AR2PDEN,
 333         EMC_RW2PDEN,
 334         EMC_TXSR,
 335         EMC_TXSRDLL,
 336         EMC_TCKE,
 337         EMC_TCKESR,
 338         EMC_TPD,
 339         EMC_TFAW,
 340         EMC_TRPAB,
 341         EMC_TCLKSTABLE,
 342         EMC_TCLKSTOP,
 343         EMC_TREFBW,
 344         EMC_FBIO_CFG6,
 345         EMC_ODT_WRITE,
 346         EMC_ODT_READ,
 347         EMC_FBIO_CFG5,
 348         EMC_CFG_DIG_DLL,
 349         EMC_CFG_DIG_DLL_PERIOD,
 350         EMC_DLL_XFORM_DQS0,
 351         EMC_DLL_XFORM_DQS1,
 352         EMC_DLL_XFORM_DQS2,
 353         EMC_DLL_XFORM_DQS3,
 354         EMC_DLL_XFORM_DQS4,
 355         EMC_DLL_XFORM_DQS5,
 356         EMC_DLL_XFORM_DQS6,
 357         EMC_DLL_XFORM_DQS7,
 358         EMC_DLL_XFORM_DQS8,
 359         EMC_DLL_XFORM_DQS9,
 360         EMC_DLL_XFORM_DQS10,
 361         EMC_DLL_XFORM_DQS11,
 362         EMC_DLL_XFORM_DQS12,
 363         EMC_DLL_XFORM_DQS13,
 364         EMC_DLL_XFORM_DQS14,
 365         EMC_DLL_XFORM_DQS15,
 366         EMC_DLL_XFORM_QUSE0,
 367         EMC_DLL_XFORM_QUSE1,
 368         EMC_DLL_XFORM_QUSE2,
 369         EMC_DLL_XFORM_QUSE3,
 370         EMC_DLL_XFORM_QUSE4,
 371         EMC_DLL_XFORM_QUSE5,
 372         EMC_DLL_XFORM_QUSE6,
 373         EMC_DLL_XFORM_QUSE7,
 374         EMC_DLL_XFORM_ADDR0,
 375         EMC_DLL_XFORM_ADDR1,
 376         EMC_DLL_XFORM_ADDR2,
 377         EMC_DLL_XFORM_ADDR3,
 378         EMC_DLL_XFORM_ADDR4,
 379         EMC_DLL_XFORM_ADDR5,
 380         EMC_DLL_XFORM_QUSE8,
 381         EMC_DLL_XFORM_QUSE9,
 382         EMC_DLL_XFORM_QUSE10,
 383         EMC_DLL_XFORM_QUSE11,
 384         EMC_DLL_XFORM_QUSE12,
 385         EMC_DLL_XFORM_QUSE13,
 386         EMC_DLL_XFORM_QUSE14,
 387         EMC_DLL_XFORM_QUSE15,
 388         EMC_DLI_TRIM_TXDQS0,
 389         EMC_DLI_TRIM_TXDQS1,
 390         EMC_DLI_TRIM_TXDQS2,
 391         EMC_DLI_TRIM_TXDQS3,
 392         EMC_DLI_TRIM_TXDQS4,
 393         EMC_DLI_TRIM_TXDQS5,
 394         EMC_DLI_TRIM_TXDQS6,
 395         EMC_DLI_TRIM_TXDQS7,
 396         EMC_DLI_TRIM_TXDQS8,
 397         EMC_DLI_TRIM_TXDQS9,
 398         EMC_DLI_TRIM_TXDQS10,
 399         EMC_DLI_TRIM_TXDQS11,
 400         EMC_DLI_TRIM_TXDQS12,
 401         EMC_DLI_TRIM_TXDQS13,
 402         EMC_DLI_TRIM_TXDQS14,
 403         EMC_DLI_TRIM_TXDQS15,
 404         EMC_DLL_XFORM_DQ0,
 405         EMC_DLL_XFORM_DQ1,
 406         EMC_DLL_XFORM_DQ2,
 407         EMC_DLL_XFORM_DQ3,
 408         EMC_DLL_XFORM_DQ4,
 409         EMC_DLL_XFORM_DQ5,
 410         EMC_DLL_XFORM_DQ6,
 411         EMC_DLL_XFORM_DQ7,
 412         EMC_XM2CMDPADCTRL,
 413         EMC_XM2CMDPADCTRL4,
 414         EMC_XM2CMDPADCTRL5,
 415         EMC_XM2DQPADCTRL2,
 416         EMC_XM2DQPADCTRL3,
 417         EMC_XM2CLKPADCTRL,
 418         EMC_XM2CLKPADCTRL2,
 419         EMC_XM2COMPPADCTRL,
 420         EMC_XM2VTTGENPADCTRL,
 421         EMC_XM2VTTGENPADCTRL2,
 422         EMC_XM2VTTGENPADCTRL3,
 423         EMC_XM2DQSPADCTRL3,
 424         EMC_XM2DQSPADCTRL4,
 425         EMC_XM2DQSPADCTRL5,
 426         EMC_XM2DQSPADCTRL6,
 427         EMC_DSR_VTTGEN_DRV,
 428         EMC_TXDSRVTTGEN,
 429         EMC_FBIO_SPARE,
 430         EMC_ZCAL_WAIT_CNT,
 431         EMC_MRS_WAIT_CNT2,
 432         EMC_CTT,
 433         EMC_CTT_DURATION,
 434         EMC_CFG_PIPE,
 435         EMC_DYN_SELF_REF_CONTROL,
 436         EMC_QPOP
 437 };
 438
 439 struct emc_timing {
 440         unsigned long rate;
 441
 442         u32 emc_burst_data[ARRAY_SIZE(emc_burst_regs)];
 443
 444         u32 emc_auto_cal_config;
 445         u32 emc_auto_cal_config2;
 446         u32 emc_auto_cal_config3;
 447         u32 emc_auto_cal_interval;
 448         u32 emc_bgbias_ctl0;
 449         u32 emc_cfg;
 450         u32 emc_cfg_2;
 451         u32 emc_ctt_term_ctrl;
 452         u32 emc_mode_1;
 453         u32 emc_mode_2;
 454         u32 emc_mode_4;
 455         u32 emc_mode_reset;
 456         u32 emc_mrs_wait_cnt;
 457         u32 emc_sel_dpd_ctrl;
 458         u32 emc_xm2dqspadctrl2;
 459         u32 emc_zcal_cnt_long;
 460         u32 emc_zcal_interval;
 461 };
 462
 463 struct tegra_emc {
 464         struct device *dev;
 465
 466         struct tegra_mc *mc;
 467
 468         void __iomem *regs;
 469
 470         struct clk *clk;
 471
 472         enum emc_dram_type dram_type;
 473         unsigned int dram_num;
 474
 475         struct emc_timing last_timing;
 476         struct emc_timing *timings;
 477         unsigned int num_timings;
 478
 479         struct {
 480                 struct dentry *root;
 481                 unsigned long min_rate;
 482                 unsigned long max_rate;
 483         } debugfs;
 484 };
 485
 486 /* Timing change sequence functions */
 487
 488 static void emc_ccfifo_writel(struct tegra_emc *emc, u32 value,
 489                               unsigned long offset)
 490 {
 491         writel(value, emc->regs + EMC_CCFIFO_DATA);
 492         writel(offset, emc->regs + EMC_CCFIFO_ADDR);
 493 }
 494
 495 static void emc_seq_update_timing(struct tegra_emc *emc)
 496 {
 497         unsigned int i;
 498         u32 value;
 499
 500         writel(1, emc->regs + EMC_TIMING_CONTROL);
 501
 502         for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
 503                 value = readl(emc->regs + EMC_STATUS);
 504                 if ((value & EMC_STATUS_TIMING_UPDATE_STALLED) == 0)
 505                         return;
 506                 udelay(1);
 507         }
 508
 509         dev_err(emc->dev, "timing update timed out\n");
 510 }
 511
 512 static void emc_seq_disable_auto_cal(struct tegra_emc *emc)
 513 {
 514         unsigned int i;
 515         u32 value;
 516
 517         writel(0, emc->regs + EMC_AUTO_CAL_INTERVAL);
 518
 519         for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
 520                 value = readl(emc->regs + EMC_AUTO_CAL_STATUS);
 521                 if ((value & EMC_AUTO_CAL_STATUS_ACTIVE) == 0)
 522                         return;
 523                 udelay(1);
 524         }
 525
 526         dev_err(emc->dev, "auto cal disable timed out\n");
 527 }
 528
 529 static void emc_seq_wait_clkchange(struct tegra_emc *emc)
 530 {
 531         unsigned int i;
 532         u32 value;
 533
 534         for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) {
 535                 value = readl(emc->regs + EMC_INTSTATUS);
 536                 if (value & EMC_INTSTATUS_CLKCHANGE_COMPLETE)
 537                         return;
 538                 udelay(1);
 539         }
 540
 541         dev_err(emc->dev, "clock change timed out\n");
 542 }
 543
 544 static struct emc_timing *tegra_emc_find_timing(struct tegra_emc *emc,
 545                                                 unsigned long rate)
 546 {
 547         struct emc_timing *timing = NULL;
 548         unsigned int i;
 549
 550         for (i = 0; i < emc->num_timings; i++) {
 551                 if (emc->timings[i].rate == rate) {
 552                         timing = &emc->timings[i];
 553                         break;
 554                 }
 555         }
 556
 557         if (!timing) {
 558                 dev_err(emc->dev, "no timing for rate %lu\n", rate);
 559                 return NULL;
 560         }
 561
 562         return timing;
 563 }
 564
 565 int tegra_emc_prepare_timing_change(struct tegra_emc *emc,
 566                                     unsigned long rate)
 567 {
 568         struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
 569         struct emc_timing *last = &emc->last_timing;
 570         enum emc_dll_change dll_change;
 571         unsigned int pre_wait = 0;
 572         u32 val, val2, mask;
 573         bool update = false;
 574         unsigned int i;
 575
 576         if (!timing)
 577                 return -ENOENT;
 578
 579         if ((last->emc_mode_1 & 0x1) == (timing->emc_mode_1 & 0x1))
 580                 dll_change = DLL_CHANGE_NONE;
 581         else if (timing->emc_mode_1 & 0x1)
 582                 dll_change = DLL_CHANGE_ON;
 583         else
 584                 dll_change = DLL_CHANGE_OFF;
 585
 586         /* Clear CLKCHANGE_COMPLETE interrupts */
 587         writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE, emc->regs + EMC_INTSTATUS);
 588
 589         /* Disable dynamic self-refresh */
 590         val = readl(emc->regs + EMC_CFG);
 591         if (val & EMC_CFG_PWR_MASK) {
 592                 val &= ~EMC_CFG_POWER_FEATURES_MASK;
 593                 writel(val, emc->regs + EMC_CFG);
 594
 595                 pre_wait = 5;
 596         }
 597
 598         /* Disable SEL_DPD_CTRL for clock change */
 599         if (emc->dram_type == DRAM_TYPE_DDR3)
 600                 mask = EMC_SEL_DPD_CTRL_DDR3_MASK;
 601         else
 602                 mask = EMC_SEL_DPD_CTRL_MASK;
 603
 604         val = readl(emc->regs + EMC_SEL_DPD_CTRL);
 605         if (val & mask) {
 606                 val &= ~mask;
 607                 writel(val, emc->regs + EMC_SEL_DPD_CTRL);
 608         }
 609
 610         /* Prepare DQ/DQS for clock change */
 611         val = readl(emc->regs + EMC_BGBIAS_CTL0);
 612         val2 = last->emc_bgbias_ctl0;
 613         if (!(timing->emc_bgbias_ctl0 &
 614               EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) &&
 615             (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX)) {
 616                 val2 &= ~EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX;
 617                 update = true;
 618         }
 619
 620         if ((val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD) ||
 621             (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN)) {
 622                 update = true;
 623         }
 624
 625         if (update) {
 626                 writel(val2, emc->regs + EMC_BGBIAS_CTL0);
 627                 if (pre_wait < 5)
 628                         pre_wait = 5;
 629         }
 630
 631         update = false;
 632         val = readl(emc->regs + EMC_XM2DQSPADCTRL2);
 633         if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_VREF_ENABLE &&
 634             !(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) {
 635                 val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE;
 636                 update = true;
 637         }
 638
 639         if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE &&
 640             !(val & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE)) {
 641                 val |= EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE;
 642                 update = true;
 643         }
 644
 645         if (update) {
 646                 writel(val, emc->regs + EMC_XM2DQSPADCTRL2);
 647                 if (pre_wait < 30)
 648                         pre_wait = 30;
 649         }
 650
 651         /* Wait to settle */
 652         if (pre_wait) {
 653                 emc_seq_update_timing(emc);
 654                 udelay(pre_wait);
 655         }
 656
 657         /* Program CTT_TERM control */
 658         if (last->emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) {
 659                 emc_seq_disable_auto_cal(emc);
 660                 writel(timing->emc_ctt_term_ctrl,
 661                        emc->regs + EMC_CTT_TERM_CTRL);
 662                 emc_seq_update_timing(emc);
 663         }
 664
 665         /* Program burst shadow registers */
 666         for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i)
 667                 writel(timing->emc_burst_data[i],
 668                        emc->regs + emc_burst_regs[i]);
 669
 670         writel(timing->emc_xm2dqspadctrl2, emc->regs + EMC_XM2DQSPADCTRL2);
 671         writel(timing->emc_zcal_interval, emc->regs + EMC_ZCAL_INTERVAL);
 672
 673         tegra_mc_write_emem_configuration(emc->mc, timing->rate);
 674
 675         val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK;
 676         emc_ccfifo_writel(emc, val, EMC_CFG);
 677
 678         /* Program AUTO_CAL_CONFIG */
 679         if (timing->emc_auto_cal_config2 != last->emc_auto_cal_config2)
 680                 emc_ccfifo_writel(emc, timing->emc_auto_cal_config2,
 681                                   EMC_AUTO_CAL_CONFIG2);
 682
 683         if (timing->emc_auto_cal_config3 != last->emc_auto_cal_config3)
 684                 emc_ccfifo_writel(emc, timing->emc_auto_cal_config3,
 685                                   EMC_AUTO_CAL_CONFIG3);
 686
 687         if (timing->emc_auto_cal_config != last->emc_auto_cal_config) {
 688                 val = timing->emc_auto_cal_config;
 689                 val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START;
 690                 emc_ccfifo_writel(emc, val, EMC_AUTO_CAL_CONFIG);
 691         }
 692
 693         /* DDR3: predict MRS long wait count */
 694         if (emc->dram_type == DRAM_TYPE_DDR3 &&
 695             dll_change == DLL_CHANGE_ON) {
 696                 u32 cnt = 512;
 697
 698                 if (timing->emc_zcal_interval != 0 &&
 699                     last->emc_zcal_interval == 0)
 700                         cnt -= emc->dram_num * 256;
 701
 702                 val = (timing->emc_mrs_wait_cnt
 703                         & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK)
 704                         >> EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT;
 705                 if (cnt < val)
 706                         cnt = val;
 707
 708                 val = timing->emc_mrs_wait_cnt
 709                         & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
 710                 val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT)
 711                         & EMC_MRS_WAIT_CNT_LONG_WAIT_MASK;
 712
 713                 writel(val, emc->regs + EMC_MRS_WAIT_CNT);
 714         }
 715
 716         val = timing->emc_cfg_2;
 717         val &= ~EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR;
 718         emc_ccfifo_writel(emc, val, EMC_CFG_2);
 719
 720         /* DDR3: Turn off DLL and enter self-refresh */
 721         if (emc->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF)
 722                 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
 723
 724         /* Disable refresh controller */
 725         emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num),
 726                           EMC_REFCTRL);
 727         if (emc->dram_type == DRAM_TYPE_DDR3)
 728                 emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num) |
 729                                        EMC_SELF_REF_CMD_ENABLED,
 730                                   EMC_SELF_REF);
 731
 732         /* Flow control marker */
 733         emc_ccfifo_writel(emc, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE);
 734
 735         /* DDR3: Exit self-refresh */
 736         if (emc->dram_type == DRAM_TYPE_DDR3)
 737                 emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num),
 738                                   EMC_SELF_REF);
 739         emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num) |
 740                                EMC_REFCTRL_ENABLE,
 741                           EMC_REFCTRL);
 742
 743         /* Set DRAM mode registers */
 744         if (emc->dram_type == DRAM_TYPE_DDR3) {
 745                 if (timing->emc_mode_1 != last->emc_mode_1)
 746                         emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS);
 747                 if (timing->emc_mode_2 != last->emc_mode_2)
 748                         emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_EMRS2);
 749
 750                 if ((timing->emc_mode_reset != last->emc_mode_reset) ||
 751                     dll_change == DLL_CHANGE_ON) {
 752                         val = timing->emc_mode_reset;
 753                         if (dll_change == DLL_CHANGE_ON) {
 754                                 val |= EMC_MODE_SET_DLL_RESET;
 755                                 val |= EMC_MODE_SET_LONG_CNT;
 756                         } else {
 757                                 val &= ~EMC_MODE_SET_DLL_RESET;
 758                         }
 759                         emc_ccfifo_writel(emc, val, EMC_MRS);
 760                 }
 761         } else {
 762                 if (timing->emc_mode_2 != last->emc_mode_2)
 763                         emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_MRW2);
 764                 if (timing->emc_mode_1 != last->emc_mode_1)
 765                         emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_MRW);
 766                 if (timing->emc_mode_4 != last->emc_mode_4)
 767                         emc_ccfifo_writel(emc, timing->emc_mode_4, EMC_MRW4);
 768         }
 769
 770         /*  Issue ZCAL command if turning ZCAL on */
 771         if (timing->emc_zcal_interval != 0 && last->emc_zcal_interval == 0) {
 772                 emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL);
 773                 if (emc->dram_num > 1)
 774                         emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV1,
 775                                           EMC_ZQ_CAL);
 776         }
 777
 778         /*  Write to RO register to remove stall after change */
 779         emc_ccfifo_writel(emc, 0, EMC_CCFIFO_STATUS);
 780
 781         if (timing->emc_cfg_2 & EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR)
 782                 emc_ccfifo_writel(emc, timing->emc_cfg_2, EMC_CFG_2);
 783
 784         /* Disable AUTO_CAL for clock change */
 785         emc_seq_disable_auto_cal(emc);
 786
 787         /* Read register to wait until programming has settled */
 788         readl(emc->regs + EMC_INTSTATUS);
 789
 790         return 0;
 791 }
 792
 793 void tegra_emc_complete_timing_change(struct tegra_emc *emc,
 794                                       unsigned long rate)
 795 {
 796         struct emc_timing *timing = tegra_emc_find_timing(emc, rate);
 797         struct emc_timing *last = &emc->last_timing;
 798         u32 val;
 799
 800         if (!timing)
 801                 return;
 802
 803         /* Wait until the state machine has settled */
 804         emc_seq_wait_clkchange(emc);
 805
 806         /* Restore AUTO_CAL */
 807         if (timing->emc_ctt_term_ctrl != last->emc_ctt_term_ctrl)
 808                 writel(timing->emc_auto_cal_interval,
 809                        emc->regs + EMC_AUTO_CAL_INTERVAL);
 810
 811         /* Restore dynamic self-refresh */
 812         if (timing->emc_cfg & EMC_CFG_PWR_MASK)
 813                 writel(timing->emc_cfg, emc->regs + EMC_CFG);
 814
 815         /* Set ZCAL wait count */
 816         writel(timing->emc_zcal_cnt_long, emc->regs + EMC_ZCAL_WAIT_CNT);
 817
 818         /* LPDDR3: Turn off BGBIAS if low frequency */
 819         if (emc->dram_type == DRAM_TYPE_LPDDR3 &&
 820             timing->emc_bgbias_ctl0 &
 821               EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) {
 822                 val = timing->emc_bgbias_ctl0;
 823                 val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN;
 824                 val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD;
 825                 writel(val, emc->regs + EMC_BGBIAS_CTL0);
 826         } else {
 827                 if (emc->dram_type == DRAM_TYPE_DDR3 &&
 828                     readl(emc->regs + EMC_BGBIAS_CTL0) !=
 829                       timing->emc_bgbias_ctl0) {
 830                         writel(timing->emc_bgbias_ctl0,
 831                                emc->regs + EMC_BGBIAS_CTL0);
 832                 }
 833
 834                 writel(timing->emc_auto_cal_interval,
 835                        emc->regs + EMC_AUTO_CAL_INTERVAL);
 836         }
 837
 838         /* Wait for timing to settle */
 839         udelay(2);
 840
 841         /* Reprogram SEL_DPD_CTRL */
 842         writel(timing->emc_sel_dpd_ctrl, emc->regs + EMC_SEL_DPD_CTRL);
 843         emc_seq_update_timing(emc);
 844
 845         emc->last_timing = *timing;
 846 }
 847
 848 /* Initialization and deinitialization */
 849
 850 static void emc_read_current_timing(struct tegra_emc *emc,
 851                                     struct emc_timing *timing)
 852 {
 853         unsigned int i;
 854
 855         for (i = 0; i < ARRAY_SIZE(emc_burst_regs); ++i)
 856                 timing->emc_burst_data[i] =
 857                         readl(emc->regs + emc_burst_regs[i]);
 858
 859         timing->emc_cfg = readl(emc->regs + EMC_CFG);
 860
 861         timing->emc_auto_cal_interval = 0;
 862         timing->emc_zcal_cnt_long = 0;
 863         timing->emc_mode_1 = 0;
 864         timing->emc_mode_2 = 0;
 865         timing->emc_mode_4 = 0;
 866         timing->emc_mode_reset = 0;
 867 }
 868
 869 static int emc_init(struct tegra_emc *emc)
 870 {
 871         emc->dram_type = readl(emc->regs + EMC_FBIO_CFG5);
 872         emc->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK;
 873         emc->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT;
 874
 875         emc->dram_num = tegra_mc_get_emem_device_count(emc->mc);
 876
 877         emc_read_current_timing(emc, &emc->last_timing);
 878
 879         return 0;
 880 }
 881
 882 static int load_one_timing_from_dt(struct tegra_emc *emc,
 883                                    struct emc_timing *timing,
 884                                    struct device_node *node)
 885 {
 886         u32 value;
 887         int err;
 888
 889         err = of_property_read_u32(node, "clock-frequency", &value);
 890         if (err) {
 891                 dev_err(emc->dev, "timing %pOFn: failed to read rate: %d\n",
 892                         node, err);
 893                 return err;
 894         }
 895
 896         timing->rate = value;
 897
 898         err = of_property_read_u32_array(node, "nvidia,emc-configuration",
 899                                          timing->emc_burst_data,
 900                                          ARRAY_SIZE(timing->emc_burst_data));
 901         if (err) {
 902                 dev_err(emc->dev,
 903                         "timing %pOFn: failed to read emc burst data: %d\n",
 904                         node, err);
 905                 return err;
 906         }
 907
 908 #define EMC_READ_PROP(prop, dtprop) { \
 909         err = of_property_read_u32(node, dtprop, &timing->prop); \
 910         if (err) { \
 911                 dev_err(emc->dev, "timing %pOFn: failed to read " #prop ": %d\n", \
 912                         node, err); \
 913                 return err; \
 914         } \
 915 }
 916
 917         EMC_READ_PROP(emc_auto_cal_config, "nvidia,emc-auto-cal-config")
 918         EMC_READ_PROP(emc_auto_cal_config2, "nvidia,emc-auto-cal-config2")
 919         EMC_READ_PROP(emc_auto_cal_config3, "nvidia,emc-auto-cal-config3")
 920         EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval")
 921         EMC_READ_PROP(emc_bgbias_ctl0, "nvidia,emc-bgbias-ctl0")
 922         EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg")
 923         EMC_READ_PROP(emc_cfg_2, "nvidia,emc-cfg-2")
 924         EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl")
 925         EMC_READ_PROP(emc_mode_1, "nvidia,emc-mode-1")
 926         EMC_READ_PROP(emc_mode_2, "nvidia,emc-mode-2")
 927         EMC_READ_PROP(emc_mode_4, "nvidia,emc-mode-4")
 928         EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset")
 929         EMC_READ_PROP(emc_mrs_wait_cnt, "nvidia,emc-mrs-wait-cnt")
 930         EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl")
 931         EMC_READ_PROP(emc_xm2dqspadctrl2, "nvidia,emc-xm2dqspadctrl2")
 932         EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long")
 933         EMC_READ_PROP(emc_zcal_interval, "nvidia,emc-zcal-interval")
 934
 935 #undef EMC_READ_PROP
 936
 937         return 0;
 938 }
 939
 940 static int cmp_timings(const void *_a, const void *_b)
 941 {
 942         const struct emc_timing *a = _a;
 943         const struct emc_timing *b = _b;
 944
 945         if (a->rate < b->rate)
 946                 return -1;
 947         else if (a->rate == b->rate)
 948                 return 0;
 949         else
 950                 return 1;
 951 }
 952
 953 static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc,
 954                                           struct device_node *node)
 955 {
 956         int child_count = of_get_child_count(node);
 957         struct device_node *child;
 958         struct emc_timing *timing;
 959         unsigned int i = 0;
 960         int err;
 961
 962         emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing),
 963                                     GFP_KERNEL);
 964         if (!emc->timings)
 965                 return -ENOMEM;
 966
 967         emc->num_timings = child_count;
 968
 969         for_each_child_of_node(node, child) {
 970                 timing = &emc->timings[i++];
 971
 972                 err = load_one_timing_from_dt(emc, timing, child);
 973                 if (err) {
 974                         of_node_put(child);
 975                         return err;
 976                 }
 977         }
 978
 979         sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings,
 980              NULL);
 981
 982         return 0;
 983 }
 984
 985 static const struct of_device_id tegra_emc_of_match[] = {
 986         { .compatible = "nvidia,tegra124-emc" },
 987         { .compatible = "nvidia,tegra132-emc" },
 988         {}
 989 };
 990
 991 static struct device_node *
 992 tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code)
 993 {
 994         struct device_node *np;
 995         int err;
 996
 997         for_each_child_of_node(node, np) {
 998                 u32 value;
 999
1000                 err = of_property_read_u32(np, "nvidia,ram-code", &value);
1001                 if (err || (value != ram_code))
1002                         continue;
1003
1004                 return np;
1005         }
1006
1007         return NULL;
1008 }
1009
1010 /*
1011  * debugfs interface
1012  *
1013  * The memory controller driver exposes some files in debugfs that can be used
1014  * to control the EMC frequency. The top-level directory can be found here:
1015  *
1016  *   /sys/kernel/debug/emc
1017  *
1018  * It contains the following files:
1019  *
1020  *   - available_rates: This file contains a list of valid, space-separated
1021  *     EMC frequencies.
1022  *
1023  *   - min_rate: Writing a value to this file sets the given frequency as the
1024  *       floor of the permitted range. If this is higher than the currently
1025  *       configured EMC frequency, this will cause the frequency to be
1026  *       increased so that it stays within the valid range.
1027  *
1028  *   - max_rate: Similarily to the min_rate file, writing a value to this file
1029  *       sets the given frequency as the ceiling of the permitted range. If
1030  *       the value is lower than the currently configured EMC frequency, this
1031  *       will cause the frequency to be decreased so that it stays within the
1032  *       valid range.
1033  */
1034
1035 static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate)
1036 {
1037         unsigned int i;
1038
1039         for (i = 0; i < emc->num_timings; i++)
1040                 if (rate == emc->timings[i].rate)
1041                         return true;
1042
1043         return false;
1044 }
1045
1046 static int tegra_emc_debug_available_rates_show(struct seq_file *s,
1047                                                 void *data)
1048 {
1049         struct tegra_emc *emc = s->private;
1050         const char *prefix = "";
1051         unsigned int i;
1052
1053         for (i = 0; i < emc->num_timings; i++) {
1054                 seq_printf(s, "%s%lu", prefix, emc->timings[i].rate);
1055                 prefix = " ";
1056         }
1057
1058         seq_puts(s, "\n");
1059
1060         return 0;
1061 }
1062
1063 DEFINE_SHOW_ATTRIBUTE(tegra_emc_debug_available_rates);
1064
1065 static int tegra_emc_debug_min_rate_get(void *data, u64 *rate)
1066 {
1067         struct tegra_emc *emc = data;
1068
1069         *rate = emc->debugfs.min_rate;
1070
1071         return 0;
1072 }
1073
1074 static int tegra_emc_debug_min_rate_set(void *data, u64 rate)
1075 {
1076         struct tegra_emc *emc = data;
1077         int err;
1078
1079         if (!tegra_emc_validate_rate(emc, rate))
1080                 return -EINVAL;
1081
1082         err = clk_set_min_rate(emc->clk, rate);
1083         if (err < 0)
1084                 return err;
1085
1086         emc->debugfs.min_rate = rate;
1087
1088         return 0;
1089 }
1090
1091 DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_min_rate_fops,
1092                         tegra_emc_debug_min_rate_get,
1093                         tegra_emc_debug_min_rate_set, "%llu\n");
1094
1095 static int tegra_emc_debug_max_rate_get(void *data, u64 *rate)
1096 {
1097         struct tegra_emc *emc = data;
1098
1099         *rate = emc->debugfs.max_rate;
1100
1101         return 0;
1102 }
1103
1104 static int tegra_emc_debug_max_rate_set(void *data, u64 rate)
1105 {
1106         struct tegra_emc *emc = data;
1107         int err;
1108
1109         if (!tegra_emc_validate_rate(emc, rate))
1110                 return -EINVAL;
1111
1112         err = clk_set_max_rate(emc->clk, rate);
1113         if (err < 0)
1114                 return err;
1115
1116         emc->debugfs.max_rate = rate;
1117
1118         return 0;
1119 }
1120
1121 DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_max_rate_fops,
1122                         tegra_emc_debug_max_rate_get,
1123                         tegra_emc_debug_max_rate_set, "%llu\n");
1124
1125 static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc)
1126 {
1127         unsigned int i;
1128         int err;
1129
1130         emc->clk = devm_clk_get(dev, "emc");
1131         if (IS_ERR(emc->clk)) {
1132                 if (PTR_ERR(emc->clk) != -ENODEV) {
1133                         dev_err(dev, "failed to get EMC clock: %ld\n",
1134                                 PTR_ERR(emc->clk));
1135                         return;
1136                 }
1137         }
1138
1139         emc->debugfs.min_rate = ULONG_MAX;
1140         emc->debugfs.max_rate = 0;
1141
1142         for (i = 0; i < emc->num_timings; i++) {
1143                 if (emc->timings[i].rate < emc->debugfs.min_rate)
1144                         emc->debugfs.min_rate = emc->timings[i].rate;
1145
1146                 if (emc->timings[i].rate > emc->debugfs.max_rate)
1147                         emc->debugfs.max_rate = emc->timings[i].rate;
1148         }
1149
1150         if (!emc->num_timings) {
1151                 emc->debugfs.min_rate = clk_get_rate(emc->clk);
1152                 emc->debugfs.max_rate = emc->debugfs.min_rate;
1153         }
1154
1155         err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate,
1156                                  emc->debugfs.max_rate);
1157         if (err < 0) {
1158                 dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n",
1159                         emc->debugfs.min_rate, emc->debugfs.max_rate,
1160                         emc->clk);
1161                 return;
1162         }
1163
1164         emc->debugfs.root = debugfs_create_dir("emc", NULL);
1165         if (!emc->debugfs.root) {
1166                 dev_err(dev, "failed to create debugfs directory\n");
1167                 return;
1168         }
1169
1170         debugfs_create_file("available_rates", 0444, emc->debugfs.root, emc,
1171                             &tegra_emc_debug_available_rates_fops);
1172         debugfs_create_file("min_rate", 0644, emc->debugfs.root,
1173                             emc, &tegra_emc_debug_min_rate_fops);
1174         debugfs_create_file("max_rate", 0644, emc->debugfs.root,
1175                             emc, &tegra_emc_debug_max_rate_fops);
1176 }
1177
1178 static int tegra_emc_probe(struct platform_device *pdev)
1179 {
1180         struct platform_device *mc;
1181         struct device_node *np;
1182         struct tegra_emc *emc;
1183         struct resource *res;
1184         u32 ram_code;
1185         int err;
1186
1187         emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
1188         if (!emc)
1189                 return -ENOMEM;
1190
1191         emc->dev = &pdev->dev;
1192
1193         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1194         emc->regs = devm_ioremap_resource(&pdev->dev, res);
1195         if (IS_ERR(emc->regs))
1196                 return PTR_ERR(emc->regs);
1197
1198         np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0);
1199         if (!np) {
1200                 dev_err(&pdev->dev, "could not get memory controller\n");
1201                 return -ENOENT;
1202         }
1203
1204         mc = of_find_device_by_node(np);
1205         of_node_put(np);
1206         if (!mc)
1207                 return -ENOENT;
1208
1209         emc->mc = platform_get_drvdata(mc);
1210         if (!emc->mc)
1211                 return -EPROBE_DEFER;
1212
1213         ram_code = tegra_read_ram_code();
1214
1215         np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
1216         if (!np) {
1217                 dev_err(&pdev->dev,
1218                         "no memory timings for RAM code %u found in DT\n",
1219                         ram_code);
1220                 return -ENOENT;
1221         }
1222
1223         err = tegra_emc_load_timings_from_dt(emc, np);
1224         of_node_put(np);
1225         if (err)
1226                 return err;
1227
1228         if (emc->num_timings == 0) {
1229                 dev_err(&pdev->dev,
1230                         "no memory timings for RAM code %u registered\n",
1231                         ram_code);
1232                 return -ENOENT;
1233         }
1234
1235         err = emc_init(emc);
1236         if (err) {
1237                 dev_err(&pdev->dev, "EMC initialization failed: %d\n", err);
1238                 return err;
1239         }
1240
1241         platform_set_drvdata(pdev, emc);
1242
1243         if (IS_ENABLED(CONFIG_DEBUG_FS))
1244                 emc_debugfs_init(&pdev->dev, emc);
1245
1246         return 0;
1247 };
1248
1249 static struct platform_driver tegra_emc_driver = {
1250         .probe = tegra_emc_probe,
1251         .driver = {
1252                 .name = "tegra-emc",
1253                 .of_match_table = tegra_emc_of_match,
1254                 .suppress_bind_attrs = true,
1255         },
1256 };
1257
1258 static int tegra_emc_init(void)
1259 {
1260         return platform_driver_register(&tegra_emc_driver);
1261 }
1262 subsys_initcall(tegra_emc_init);