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/clk/tegra.h> 13#include <linux/debugfs.h> 14#include <linux/delay.h> 15#include <linux/interconnect-provider.h> 16#include <linux/io.h> 17#include <linux/module.h> 18#include <linux/mutex.h> 19#include <linux/of_address.h> 20#include <linux/of_platform.h> 21#include <linux/platform_device.h> 22#include <linux/pm_opp.h> 23#include <linux/sort.h> 24#include <linux/string.h> 25 26#include <soc/tegra/fuse.h> 27#include <soc/tegra/mc.h> 28 29#include "mc.h" 30 31#define EMC_FBIO_CFG5 0x104 32#define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3 33#define EMC_FBIO_CFG5_DRAM_TYPE_SHIFT 0 34#define EMC_FBIO_CFG5_DRAM_WIDTH_X64 BIT(4) 35 36#define EMC_INTSTATUS 0x0 37#define EMC_INTSTATUS_CLKCHANGE_COMPLETE BIT(4) 38 39#define EMC_CFG 0xc 40#define EMC_CFG_DRAM_CLKSTOP_PD BIT(31) 41#define EMC_CFG_DRAM_CLKSTOP_SR BIT(30) 42#define EMC_CFG_DRAM_ACPD BIT(29) 43#define EMC_CFG_DYN_SREF BIT(28) 44#define EMC_CFG_PWR_MASK ((0xF << 28) | BIT(18)) 45#define EMC_CFG_DSR_VTTGEN_DRV_EN BIT(18) 46 47#define EMC_REFCTRL 0x20 48#define EMC_REFCTRL_DEV_SEL_SHIFT 0 49#define EMC_REFCTRL_ENABLE BIT(31) 50 51#define EMC_TIMING_CONTROL 0x28 52#define EMC_RC 0x2c 53#define EMC_RFC 0x30 54#define EMC_RAS 0x34 55#define EMC_RP 0x38 56#define EMC_R2W 0x3c 57#define EMC_W2R 0x40 58#define EMC_R2P 0x44 59#define EMC_W2P 0x48 60#define EMC_RD_RCD 0x4c 61#define EMC_WR_RCD 0x50 62#define EMC_RRD 0x54 63#define EMC_REXT 0x58 64#define EMC_WDV 0x5c 65#define EMC_QUSE 0x60 66#define EMC_QRST 0x64 67#define EMC_QSAFE 0x68 68#define EMC_RDV 0x6c 69#define EMC_REFRESH 0x70 70#define EMC_BURST_REFRESH_NUM 0x74 71#define EMC_PDEX2WR 0x78 72#define EMC_PDEX2RD 0x7c 73#define EMC_PCHG2PDEN 0x80 74#define EMC_ACT2PDEN 0x84 75#define EMC_AR2PDEN 0x88 76#define EMC_RW2PDEN 0x8c 77#define EMC_TXSR 0x90 78#define EMC_TCKE 0x94 79#define EMC_TFAW 0x98 80#define EMC_TRPAB 0x9c 81#define EMC_TCLKSTABLE 0xa0 82#define EMC_TCLKSTOP 0xa4 83#define EMC_TREFBW 0xa8 84#define EMC_ODT_WRITE 0xb0 85#define EMC_ODT_READ 0xb4 86#define EMC_WEXT 0xb8 87#define EMC_CTT 0xbc 88#define EMC_RFC_SLR 0xc0 89#define EMC_MRS_WAIT_CNT2 0xc4 90 91#define EMC_MRS_WAIT_CNT 0xc8 92#define EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT 0 93#define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK \ 94 (0x3FF << EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT) 95#define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT 16 96#define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK \ 97 (0x3FF << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) 98 99#define EMC_MRS 0xcc 100#define EMC_MODE_SET_DLL_RESET BIT(8) 101#define EMC_MODE_SET_LONG_CNT BIT(26) 102#define EMC_EMRS 0xd0 103#define EMC_REF 0xd4 104#define EMC_PRE 0xd8 105 106#define EMC_SELF_REF 0xe0 107#define EMC_SELF_REF_CMD_ENABLED BIT(0) 108#define EMC_SELF_REF_DEV_SEL_SHIFT 30 109 110#define EMC_MRW 0xe8 111 112#define EMC_MRR 0xec 113#define EMC_MRR_MA_SHIFT 16 114#define LPDDR2_MR4_TEMP_SHIFT 0 115 116#define EMC_XM2DQSPADCTRL3 0xf8 117#define EMC_FBIO_SPARE 0x100 118 119#define EMC_FBIO_CFG6 0x114 120#define EMC_EMRS2 0x12c 121#define EMC_MRW2 0x134 122#define EMC_MRW4 0x13c 123#define EMC_EINPUT 0x14c 124#define EMC_EINPUT_DURATION 0x150 125#define EMC_PUTERM_EXTRA 0x154 126#define EMC_TCKESR 0x158 127#define EMC_TPD 0x15c 128 129#define EMC_AUTO_CAL_CONFIG 0x2a4 130#define EMC_AUTO_CAL_CONFIG_AUTO_CAL_START BIT(31) 131#define EMC_AUTO_CAL_INTERVAL 0x2a8 132#define EMC_AUTO_CAL_STATUS 0x2ac 133#define EMC_AUTO_CAL_STATUS_ACTIVE BIT(31) 134#define EMC_STATUS 0x2b4 135#define EMC_STATUS_TIMING_UPDATE_STALLED BIT(23) 136 137#define EMC_CFG_2 0x2b8 138#define EMC_CFG_2_MODE_SHIFT 0 139#define EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR BIT(6) 140 141#define EMC_CFG_DIG_DLL 0x2bc 142#define EMC_CFG_DIG_DLL_PERIOD 0x2c0 143#define EMC_RDV_MASK 0x2cc 144#define EMC_WDV_MASK 0x2d0 145#define EMC_CTT_DURATION 0x2d8 146#define EMC_CTT_TERM_CTRL 0x2dc 147#define EMC_ZCAL_INTERVAL 0x2e0 148#define EMC_ZCAL_WAIT_CNT 0x2e4 149 150#define EMC_ZQ_CAL 0x2ec 151#define EMC_ZQ_CAL_CMD BIT(0) 152#define EMC_ZQ_CAL_LONG BIT(4) 153#define EMC_ZQ_CAL_LONG_CMD_DEV0 \ 154 (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD) 155#define EMC_ZQ_CAL_LONG_CMD_DEV1 \ 156 (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD) 157 158#define EMC_XM2CMDPADCTRL 0x2f0 159#define EMC_XM2DQSPADCTRL 0x2f8 160#define EMC_XM2DQSPADCTRL2 0x2fc 161#define EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE BIT(0) 162#define EMC_XM2DQSPADCTRL2_VREF_ENABLE BIT(5) 163#define EMC_XM2DQPADCTRL 0x300 164#define EMC_XM2DQPADCTRL2 0x304 165#define EMC_XM2CLKPADCTRL 0x308 166#define EMC_XM2COMPPADCTRL 0x30c 167#define EMC_XM2VTTGENPADCTRL 0x310 168#define EMC_XM2VTTGENPADCTRL2 0x314 169#define EMC_XM2VTTGENPADCTRL3 0x318 170#define EMC_XM2DQSPADCTRL4 0x320 171#define EMC_DLL_XFORM_DQS0 0x328 172#define EMC_DLL_XFORM_DQS1 0x32c 173#define EMC_DLL_XFORM_DQS2 0x330 174#define EMC_DLL_XFORM_DQS3 0x334 175#define EMC_DLL_XFORM_DQS4 0x338 176#define EMC_DLL_XFORM_DQS5 0x33c 177#define EMC_DLL_XFORM_DQS6 0x340 178#define EMC_DLL_XFORM_DQS7 0x344 179#define EMC_DLL_XFORM_QUSE0 0x348 180#define EMC_DLL_XFORM_QUSE1 0x34c 181#define EMC_DLL_XFORM_QUSE2 0x350 182#define EMC_DLL_XFORM_QUSE3 0x354 183#define EMC_DLL_XFORM_QUSE4 0x358 184#define EMC_DLL_XFORM_QUSE5 0x35c 185#define EMC_DLL_XFORM_QUSE6 0x360 186#define EMC_DLL_XFORM_QUSE7 0x364 187#define EMC_DLL_XFORM_DQ0 0x368 188#define EMC_DLL_XFORM_DQ1 0x36c 189#define EMC_DLL_XFORM_DQ2 0x370 190#define EMC_DLL_XFORM_DQ3 0x374 191#define EMC_DLI_TRIM_TXDQS0 0x3a8 192#define EMC_DLI_TRIM_TXDQS1 0x3ac 193#define EMC_DLI_TRIM_TXDQS2 0x3b0 194#define EMC_DLI_TRIM_TXDQS3 0x3b4 195#define EMC_DLI_TRIM_TXDQS4 0x3b8 196#define EMC_DLI_TRIM_TXDQS5 0x3bc 197#define EMC_DLI_TRIM_TXDQS6 0x3c0 198#define EMC_DLI_TRIM_TXDQS7 0x3c4 199#define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE 0x3cc 200#define EMC_SEL_DPD_CTRL 0x3d8 201#define EMC_SEL_DPD_CTRL_DATA_SEL_DPD BIT(8) 202#define EMC_SEL_DPD_CTRL_ODT_SEL_DPD BIT(5) 203#define EMC_SEL_DPD_CTRL_RESET_SEL_DPD BIT(4) 204#define EMC_SEL_DPD_CTRL_CA_SEL_DPD BIT(3) 205#define EMC_SEL_DPD_CTRL_CLK_SEL_DPD BIT(2) 206#define EMC_SEL_DPD_CTRL_DDR3_MASK \ 207 ((0xf << 2) | BIT(8)) 208#define EMC_SEL_DPD_CTRL_MASK \ 209 ((0x3 << 2) | BIT(5) | BIT(8)) 210#define EMC_PRE_REFRESH_REQ_CNT 0x3dc 211#define EMC_DYN_SELF_REF_CONTROL 0x3e0 212#define EMC_TXSRDLL 0x3e4 213#define EMC_CCFIFO_ADDR 0x3e8 214#define EMC_CCFIFO_DATA 0x3ec 215#define EMC_CCFIFO_STATUS 0x3f0 216#define EMC_CDB_CNTL_1 0x3f4 217#define EMC_CDB_CNTL_2 0x3f8 218#define EMC_XM2CLKPADCTRL2 0x3fc 219#define EMC_AUTO_CAL_CONFIG2 0x458 220#define EMC_AUTO_CAL_CONFIG3 0x45c 221#define EMC_IBDLY 0x468 222#define EMC_DLL_XFORM_ADDR0 0x46c 223#define EMC_DLL_XFORM_ADDR1 0x470 224#define EMC_DLL_XFORM_ADDR2 0x474 225#define EMC_DSR_VTTGEN_DRV 0x47c 226#define EMC_TXDSRVTTGEN 0x480 227#define EMC_XM2CMDPADCTRL4 0x484 228#define EMC_XM2CMDPADCTRL5 0x488 229#define EMC_DLL_XFORM_DQS8 0x4a0 230#define EMC_DLL_XFORM_DQS9 0x4a4 231#define EMC_DLL_XFORM_DQS10 0x4a8 232#define EMC_DLL_XFORM_DQS11 0x4ac 233#define EMC_DLL_XFORM_DQS12 0x4b0 234#define EMC_DLL_XFORM_DQS13 0x4b4 235#define EMC_DLL_XFORM_DQS14 0x4b8 236#define EMC_DLL_XFORM_DQS15 0x4bc 237#define EMC_DLL_XFORM_QUSE8 0x4c0 238#define EMC_DLL_XFORM_QUSE9 0x4c4 239#define EMC_DLL_XFORM_QUSE10 0x4c8 240#define EMC_DLL_XFORM_QUSE11 0x4cc 241#define EMC_DLL_XFORM_QUSE12 0x4d0 242#define EMC_DLL_XFORM_QUSE13 0x4d4 243#define EMC_DLL_XFORM_QUSE14 0x4d8 244#define EMC_DLL_XFORM_QUSE15 0x4dc 245#define EMC_DLL_XFORM_DQ4 0x4e0 246#define EMC_DLL_XFORM_DQ5 0x4e4 247#define EMC_DLL_XFORM_DQ6 0x4e8 248#define EMC_DLL_XFORM_DQ7 0x4ec 249#define EMC_DLI_TRIM_TXDQS8 0x520 250#define EMC_DLI_TRIM_TXDQS9 0x524 251#define EMC_DLI_TRIM_TXDQS10 0x528 252#define EMC_DLI_TRIM_TXDQS11 0x52c 253#define EMC_DLI_TRIM_TXDQS12 0x530 254#define EMC_DLI_TRIM_TXDQS13 0x534 255#define EMC_DLI_TRIM_TXDQS14 0x538 256#define EMC_DLI_TRIM_TXDQS15 0x53c 257#define EMC_CDB_CNTL_3 0x540 258#define EMC_XM2DQSPADCTRL5 0x544 259#define EMC_XM2DQSPADCTRL6 0x548 260#define EMC_XM2DQPADCTRL3 0x54c 261#define EMC_DLL_XFORM_ADDR3 0x550 262#define EMC_DLL_XFORM_ADDR4 0x554 263#define EMC_DLL_XFORM_ADDR5 0x558 264#define EMC_CFG_PIPE 0x560 265#define EMC_QPOP 0x564 266#define EMC_QUSE_WIDTH 0x568 267#define EMC_PUTERM_WIDTH 0x56c 268#define EMC_BGBIAS_CTL0 0x570 269#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX BIT(3) 270#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN BIT(2) 271#define EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD BIT(1) 272#define EMC_PUTERM_ADJ 0x574 273 274#define DRAM_DEV_SEL_ALL 0 275#define DRAM_DEV_SEL_0 BIT(31) 276#define DRAM_DEV_SEL_1 BIT(30) 277 278#define EMC_CFG_POWER_FEATURES_MASK \ 279 (EMC_CFG_DYN_SREF | EMC_CFG_DRAM_ACPD | EMC_CFG_DRAM_CLKSTOP_SR | \ 280 EMC_CFG_DRAM_CLKSTOP_PD | EMC_CFG_DSR_VTTGEN_DRV_EN) 281#define EMC_REFCTRL_DEV_SEL(n) (((n > 1) ? 0 : 2) << EMC_REFCTRL_DEV_SEL_SHIFT) 282#define EMC_DRAM_DEV_SEL(n) ((n > 1) ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0) 283 284/* Maximum amount of time in us. to wait for changes to become effective */ 285#define EMC_STATUS_UPDATE_TIMEOUT 1000 286 287enum emc_dram_type { 288 DRAM_TYPE_DDR3 = 0, 289 DRAM_TYPE_DDR1 = 1, 290 DRAM_TYPE_LPDDR3 = 2, 291 DRAM_TYPE_DDR2 = 3 292}; 293 294enum emc_dll_change { 295 DLL_CHANGE_NONE, 296 DLL_CHANGE_ON, 297 DLL_CHANGE_OFF 298}; 299 300static const unsigned long emc_burst_regs[] = { 301 EMC_RC, 302 EMC_RFC, 303 EMC_RFC_SLR, 304 EMC_RAS, 305 EMC_RP, 306 EMC_R2W, 307 EMC_W2R, 308 EMC_R2P, 309 EMC_W2P, 310 EMC_RD_RCD, 311 EMC_WR_RCD, 312 EMC_RRD, 313 EMC_REXT, 314 EMC_WEXT, 315 EMC_WDV, 316 EMC_WDV_MASK, 317 EMC_QUSE, 318 EMC_QUSE_WIDTH, 319 EMC_IBDLY, 320 EMC_EINPUT, 321 EMC_EINPUT_DURATION, 322 EMC_PUTERM_EXTRA, 323 EMC_PUTERM_WIDTH, 324 EMC_PUTERM_ADJ, 325 EMC_CDB_CNTL_1, 326 EMC_CDB_CNTL_2, 327 EMC_CDB_CNTL_3, 328 EMC_QRST, 329 EMC_QSAFE, 330 EMC_RDV, 331 EMC_RDV_MASK, 332 EMC_REFRESH, 333 EMC_BURST_REFRESH_NUM, 334 EMC_PRE_REFRESH_REQ_CNT, 335 EMC_PDEX2WR, 336 EMC_PDEX2RD, 337 EMC_PCHG2PDEN, 338 EMC_ACT2PDEN, 339 EMC_AR2PDEN, 340 EMC_RW2PDEN, 341 EMC_TXSR, 342 EMC_TXSRDLL, 343 EMC_TCKE, 344 EMC_TCKESR, 345 EMC_TPD, 346 EMC_TFAW, 347 EMC_TRPAB, 348 EMC_TCLKSTABLE, 349 EMC_TCLKSTOP, 350 EMC_TREFBW, 351 EMC_FBIO_CFG6, 352 EMC_ODT_WRITE, 353 EMC_ODT_READ, 354 EMC_FBIO_CFG5, 355 EMC_CFG_DIG_DLL, 356 EMC_CFG_DIG_DLL_PERIOD, 357 EMC_DLL_XFORM_DQS0, 358 EMC_DLL_XFORM_DQS1, 359 EMC_DLL_XFORM_DQS2, 360 EMC_DLL_XFORM_DQS3, 361 EMC_DLL_XFORM_DQS4, 362 EMC_DLL_XFORM_DQS5, 363 EMC_DLL_XFORM_DQS6, 364 EMC_DLL_XFORM_DQS7, 365 EMC_DLL_XFORM_DQS8, 366 EMC_DLL_XFORM_DQS9, 367 EMC_DLL_XFORM_DQS10, 368 EMC_DLL_XFORM_DQS11, 369 EMC_DLL_XFORM_DQS12, 370 EMC_DLL_XFORM_DQS13, 371 EMC_DLL_XFORM_DQS14, 372 EMC_DLL_XFORM_DQS15, 373 EMC_DLL_XFORM_QUSE0, 374 EMC_DLL_XFORM_QUSE1, 375 EMC_DLL_XFORM_QUSE2, 376 EMC_DLL_XFORM_QUSE3, 377 EMC_DLL_XFORM_QUSE4, 378 EMC_DLL_XFORM_QUSE5, 379 EMC_DLL_XFORM_QUSE6, 380 EMC_DLL_XFORM_QUSE7, 381 EMC_DLL_XFORM_ADDR0, 382 EMC_DLL_XFORM_ADDR1, 383 EMC_DLL_XFORM_ADDR2, 384 EMC_DLL_XFORM_ADDR3, 385 EMC_DLL_XFORM_ADDR4, 386 EMC_DLL_XFORM_ADDR5, 387 EMC_DLL_XFORM_QUSE8, 388 EMC_DLL_XFORM_QUSE9, 389 EMC_DLL_XFORM_QUSE10, 390 EMC_DLL_XFORM_QUSE11, 391 EMC_DLL_XFORM_QUSE12, 392 EMC_DLL_XFORM_QUSE13, 393 EMC_DLL_XFORM_QUSE14, 394 EMC_DLL_XFORM_QUSE15, 395 EMC_DLI_TRIM_TXDQS0, 396 EMC_DLI_TRIM_TXDQS1, 397 EMC_DLI_TRIM_TXDQS2, 398 EMC_DLI_TRIM_TXDQS3, 399 EMC_DLI_TRIM_TXDQS4, 400 EMC_DLI_TRIM_TXDQS5, 401 EMC_DLI_TRIM_TXDQS6, 402 EMC_DLI_TRIM_TXDQS7, 403 EMC_DLI_TRIM_TXDQS8, 404 EMC_DLI_TRIM_TXDQS9, 405 EMC_DLI_TRIM_TXDQS10, 406 EMC_DLI_TRIM_TXDQS11, 407 EMC_DLI_TRIM_TXDQS12, 408 EMC_DLI_TRIM_TXDQS13, 409 EMC_DLI_TRIM_TXDQS14, 410 EMC_DLI_TRIM_TXDQS15, 411 EMC_DLL_XFORM_DQ0, 412 EMC_DLL_XFORM_DQ1, 413 EMC_DLL_XFORM_DQ2, 414 EMC_DLL_XFORM_DQ3, 415 EMC_DLL_XFORM_DQ4, 416 EMC_DLL_XFORM_DQ5, 417 EMC_DLL_XFORM_DQ6, 418 EMC_DLL_XFORM_DQ7, 419 EMC_XM2CMDPADCTRL, 420 EMC_XM2CMDPADCTRL4, 421 EMC_XM2CMDPADCTRL5, 422 EMC_XM2DQPADCTRL2, 423 EMC_XM2DQPADCTRL3, 424 EMC_XM2CLKPADCTRL, 425 EMC_XM2CLKPADCTRL2, 426 EMC_XM2COMPPADCTRL, 427 EMC_XM2VTTGENPADCTRL, 428 EMC_XM2VTTGENPADCTRL2, 429 EMC_XM2VTTGENPADCTRL3, 430 EMC_XM2DQSPADCTRL3, 431 EMC_XM2DQSPADCTRL4, 432 EMC_XM2DQSPADCTRL5, 433 EMC_XM2DQSPADCTRL6, 434 EMC_DSR_VTTGEN_DRV, 435 EMC_TXDSRVTTGEN, 436 EMC_FBIO_SPARE, 437 EMC_ZCAL_WAIT_CNT, 438 EMC_MRS_WAIT_CNT2, 439 EMC_CTT, 440 EMC_CTT_DURATION, 441 EMC_CFG_PIPE, 442 EMC_DYN_SELF_REF_CONTROL, 443 EMC_QPOP 444}; 445 446struct emc_timing { 447 unsigned long rate; 448 449 u32 emc_burst_data[ARRAY_SIZE(emc_burst_regs)]; 450 451 u32 emc_auto_cal_config; 452 u32 emc_auto_cal_config2; 453 u32 emc_auto_cal_config3; 454 u32 emc_auto_cal_interval; 455 u32 emc_bgbias_ctl0; 456 u32 emc_cfg; 457 u32 emc_cfg_2; 458 u32 emc_ctt_term_ctrl; 459 u32 emc_mode_1; 460 u32 emc_mode_2; 461 u32 emc_mode_4; 462 u32 emc_mode_reset; 463 u32 emc_mrs_wait_cnt; 464 u32 emc_sel_dpd_ctrl; 465 u32 emc_xm2dqspadctrl2; 466 u32 emc_zcal_cnt_long; 467 u32 emc_zcal_interval; 468}; 469 470enum emc_rate_request_type { 471 EMC_RATE_DEBUG, 472 EMC_RATE_ICC, 473 EMC_RATE_TYPE_MAX, 474}; 475 476struct emc_rate_request { 477 unsigned long min_rate; 478 unsigned long max_rate; 479}; 480 481struct tegra_emc { 482 struct device *dev; 483 484 struct tegra_mc *mc; 485 486 void __iomem *regs; 487 488 struct clk *clk; 489 490 enum emc_dram_type dram_type; 491 unsigned int dram_bus_width; 492 unsigned int dram_num; 493 494 struct emc_timing last_timing; 495 struct emc_timing *timings; 496 unsigned int num_timings; 497 498 struct { 499 struct dentry *root; 500 unsigned long min_rate; 501 unsigned long max_rate; 502 } debugfs; 503 504 struct icc_provider provider; 505 506 /* 507 * There are multiple sources in the EMC driver which could request 508 * a min/max clock rate, these rates are contained in this array. 509 */ 510 struct emc_rate_request requested_rate[EMC_RATE_TYPE_MAX]; 511 512 /* protect shared rate-change code path */ 513 struct mutex rate_lock; 514}; 515 516/* Timing change sequence functions */ 517 518static void emc_ccfifo_writel(struct tegra_emc *emc, u32 value, 519 unsigned long offset) 520{ 521 writel(value, emc->regs + EMC_CCFIFO_DATA); 522 writel(offset, emc->regs + EMC_CCFIFO_ADDR); 523} 524 525static void emc_seq_update_timing(struct tegra_emc *emc) 526{ 527 unsigned int i; 528 u32 value; 529 530 writel(1, emc->regs + EMC_TIMING_CONTROL); 531 532 for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) { 533 value = readl(emc->regs + EMC_STATUS); 534 if ((value & EMC_STATUS_TIMING_UPDATE_STALLED) == 0) 535 return; 536 udelay(1); 537 } 538 539 dev_err(emc->dev, "timing update timed out\n"); 540} 541 542static void emc_seq_disable_auto_cal(struct tegra_emc *emc) 543{ 544 unsigned int i; 545 u32 value; 546 547 writel(0, emc->regs + EMC_AUTO_CAL_INTERVAL); 548 549 for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) { 550 value = readl(emc->regs + EMC_AUTO_CAL_STATUS); 551 if ((value & EMC_AUTO_CAL_STATUS_ACTIVE) == 0) 552 return; 553 udelay(1); 554 } 555 556 dev_err(emc->dev, "auto cal disable timed out\n"); 557} 558 559static void emc_seq_wait_clkchange(struct tegra_emc *emc) 560{ 561 unsigned int i; 562 u32 value; 563 564 for (i = 0; i < EMC_STATUS_UPDATE_TIMEOUT; ++i) { 565 value = readl(emc->regs + EMC_INTSTATUS); 566 if (value & EMC_INTSTATUS_CLKCHANGE_COMPLETE) 567 return; 568 udelay(1); 569 } 570 571 dev_err(emc->dev, "clock change timed out\n"); 572} 573 574static struct emc_timing *tegra_emc_find_timing(struct tegra_emc *emc, 575 unsigned long rate) 576{ 577 struct emc_timing *timing = NULL; 578 unsigned int i; 579 580 for (i = 0; i < emc->num_timings; i++) { 581 if (emc->timings[i].rate == rate) { 582 timing = &emc->timings[i]; 583 break; 584 } 585 } 586 587 if (!timing) { 588 dev_err(emc->dev, "no timing for rate %lu\n", rate); 589 return NULL; 590 } 591 592 return timing; 593} 594 595static int tegra_emc_prepare_timing_change(struct tegra_emc *emc, 596 unsigned long rate) 597{ 598 struct emc_timing *timing = tegra_emc_find_timing(emc, rate); 599 struct emc_timing *last = &emc->last_timing; 600 enum emc_dll_change dll_change; 601 unsigned int pre_wait = 0; 602 u32 val, val2, mask; 603 bool update = false; 604 unsigned int i; 605 606 if (!timing) 607 return -ENOENT; 608 609 if ((last->emc_mode_1 & 0x1) == (timing->emc_mode_1 & 0x1)) 610 dll_change = DLL_CHANGE_NONE; 611 else if (timing->emc_mode_1 & 0x1) 612 dll_change = DLL_CHANGE_ON; 613 else 614 dll_change = DLL_CHANGE_OFF; 615 616 /* Clear CLKCHANGE_COMPLETE interrupts */ 617 writel(EMC_INTSTATUS_CLKCHANGE_COMPLETE, emc->regs + EMC_INTSTATUS); 618 619 /* Disable dynamic self-refresh */ 620 val = readl(emc->regs + EMC_CFG); 621 if (val & EMC_CFG_PWR_MASK) { 622 val &= ~EMC_CFG_POWER_FEATURES_MASK; 623 writel(val, emc->regs + EMC_CFG); 624 625 pre_wait = 5; 626 } 627 628 /* Disable SEL_DPD_CTRL for clock change */ 629 if (emc->dram_type == DRAM_TYPE_DDR3) 630 mask = EMC_SEL_DPD_CTRL_DDR3_MASK; 631 else 632 mask = EMC_SEL_DPD_CTRL_MASK; 633 634 val = readl(emc->regs + EMC_SEL_DPD_CTRL); 635 if (val & mask) { 636 val &= ~mask; 637 writel(val, emc->regs + EMC_SEL_DPD_CTRL); 638 } 639 640 /* Prepare DQ/DQS for clock change */ 641 val = readl(emc->regs + EMC_BGBIAS_CTL0); 642 val2 = last->emc_bgbias_ctl0; 643 if (!(timing->emc_bgbias_ctl0 & 644 EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) && 645 (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX)) { 646 val2 &= ~EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX; 647 update = true; 648 } 649 650 if ((val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD) || 651 (val & EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN)) { 652 update = true; 653 } 654 655 if (update) { 656 writel(val2, emc->regs + EMC_BGBIAS_CTL0); 657 if (pre_wait < 5) 658 pre_wait = 5; 659 } 660 661 update = false; 662 val = readl(emc->regs + EMC_XM2DQSPADCTRL2); 663 if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_VREF_ENABLE && 664 !(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) { 665 val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE; 666 update = true; 667 } 668 669 if (timing->emc_xm2dqspadctrl2 & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE && 670 !(val & EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE)) { 671 val |= EMC_XM2DQSPADCTRL2_RX_FT_REC_ENABLE; 672 update = true; 673 } 674 675 if (update) { 676 writel(val, emc->regs + EMC_XM2DQSPADCTRL2); 677 if (pre_wait < 30) 678 pre_wait = 30; 679 } 680 681 /* Wait to settle */ 682 if (pre_wait) { 683 emc_seq_update_timing(emc); 684 udelay(pre_wait); 685 } 686 687 /* Program CTT_TERM control */ 688 if (last->emc_ctt_term_ctrl != timing->emc_ctt_term_ctrl) { 689 emc_seq_disable_auto_cal(emc); 690 writel(timing->emc_ctt_term_ctrl, 691 emc->regs + EMC_CTT_TERM_CTRL); 692 emc_seq_update_timing(emc); 693 } 694 695 /* Program burst shadow registers */ 696 for (i = 0; i < ARRAY_SIZE(timing->emc_burst_data); ++i) 697 writel(timing->emc_burst_data[i], 698 emc->regs + emc_burst_regs[i]); 699 700 writel(timing->emc_xm2dqspadctrl2, emc->regs + EMC_XM2DQSPADCTRL2); 701 writel(timing->emc_zcal_interval, emc->regs + EMC_ZCAL_INTERVAL); 702 703 tegra_mc_write_emem_configuration(emc->mc, timing->rate); 704 705 val = timing->emc_cfg & ~EMC_CFG_POWER_FEATURES_MASK; 706 emc_ccfifo_writel(emc, val, EMC_CFG); 707 708 /* Program AUTO_CAL_CONFIG */ 709 if (timing->emc_auto_cal_config2 != last->emc_auto_cal_config2) 710 emc_ccfifo_writel(emc, timing->emc_auto_cal_config2, 711 EMC_AUTO_CAL_CONFIG2); 712 713 if (timing->emc_auto_cal_config3 != last->emc_auto_cal_config3) 714 emc_ccfifo_writel(emc, timing->emc_auto_cal_config3, 715 EMC_AUTO_CAL_CONFIG3); 716 717 if (timing->emc_auto_cal_config != last->emc_auto_cal_config) { 718 val = timing->emc_auto_cal_config; 719 val &= EMC_AUTO_CAL_CONFIG_AUTO_CAL_START; 720 emc_ccfifo_writel(emc, val, EMC_AUTO_CAL_CONFIG); 721 } 722 723 /* DDR3: predict MRS long wait count */ 724 if (emc->dram_type == DRAM_TYPE_DDR3 && 725 dll_change == DLL_CHANGE_ON) { 726 u32 cnt = 512; 727 728 if (timing->emc_zcal_interval != 0 && 729 last->emc_zcal_interval == 0) 730 cnt -= emc->dram_num * 256; 731 732 val = (timing->emc_mrs_wait_cnt 733 & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK) 734 >> EMC_MRS_WAIT_CNT_SHORT_WAIT_SHIFT; 735 if (cnt < val) 736 cnt = val; 737 738 val = timing->emc_mrs_wait_cnt 739 & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK; 740 val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) 741 & EMC_MRS_WAIT_CNT_LONG_WAIT_MASK; 742 743 writel(val, emc->regs + EMC_MRS_WAIT_CNT); 744 } 745 746 val = timing->emc_cfg_2; 747 val &= ~EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR; 748 emc_ccfifo_writel(emc, val, EMC_CFG_2); 749 750 /* DDR3: Turn off DLL and enter self-refresh */ 751 if (emc->dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_OFF) 752 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS); 753 754 /* Disable refresh controller */ 755 emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num), 756 EMC_REFCTRL); 757 if (emc->dram_type == DRAM_TYPE_DDR3) 758 emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num) | 759 EMC_SELF_REF_CMD_ENABLED, 760 EMC_SELF_REF); 761 762 /* Flow control marker */ 763 emc_ccfifo_writel(emc, 1, EMC_STALL_THEN_EXE_AFTER_CLKCHANGE); 764 765 /* DDR3: Exit self-refresh */ 766 if (emc->dram_type == DRAM_TYPE_DDR3) 767 emc_ccfifo_writel(emc, EMC_DRAM_DEV_SEL(emc->dram_num), 768 EMC_SELF_REF); 769 emc_ccfifo_writel(emc, EMC_REFCTRL_DEV_SEL(emc->dram_num) | 770 EMC_REFCTRL_ENABLE, 771 EMC_REFCTRL); 772 773 /* Set DRAM mode registers */ 774 if (emc->dram_type == DRAM_TYPE_DDR3) { 775 if (timing->emc_mode_1 != last->emc_mode_1) 776 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_EMRS); 777 if (timing->emc_mode_2 != last->emc_mode_2) 778 emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_EMRS2); 779 780 if ((timing->emc_mode_reset != last->emc_mode_reset) || 781 dll_change == DLL_CHANGE_ON) { 782 val = timing->emc_mode_reset; 783 if (dll_change == DLL_CHANGE_ON) { 784 val |= EMC_MODE_SET_DLL_RESET; 785 val |= EMC_MODE_SET_LONG_CNT; 786 } else { 787 val &= ~EMC_MODE_SET_DLL_RESET; 788 } 789 emc_ccfifo_writel(emc, val, EMC_MRS); 790 } 791 } else { 792 if (timing->emc_mode_2 != last->emc_mode_2) 793 emc_ccfifo_writel(emc, timing->emc_mode_2, EMC_MRW2); 794 if (timing->emc_mode_1 != last->emc_mode_1) 795 emc_ccfifo_writel(emc, timing->emc_mode_1, EMC_MRW); 796 if (timing->emc_mode_4 != last->emc_mode_4) 797 emc_ccfifo_writel(emc, timing->emc_mode_4, EMC_MRW4); 798 } 799 800 /* Issue ZCAL command if turning ZCAL on */ 801 if (timing->emc_zcal_interval != 0 && last->emc_zcal_interval == 0) { 802 emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV0, EMC_ZQ_CAL); 803 if (emc->dram_num > 1) 804 emc_ccfifo_writel(emc, EMC_ZQ_CAL_LONG_CMD_DEV1, 805 EMC_ZQ_CAL); 806 } 807 808 /* Write to RO register to remove stall after change */ 809 emc_ccfifo_writel(emc, 0, EMC_CCFIFO_STATUS); 810 811 if (timing->emc_cfg_2 & EMC_CFG_2_DIS_STP_OB_CLK_DURING_NON_WR) 812 emc_ccfifo_writel(emc, timing->emc_cfg_2, EMC_CFG_2); 813 814 /* Disable AUTO_CAL for clock change */ 815 emc_seq_disable_auto_cal(emc); 816 817 /* Read register to wait until programming has settled */ 818 readl(emc->regs + EMC_INTSTATUS); 819 820 return 0; 821} 822 823static void tegra_emc_complete_timing_change(struct tegra_emc *emc, 824 unsigned long rate) 825{ 826 struct emc_timing *timing = tegra_emc_find_timing(emc, rate); 827 struct emc_timing *last = &emc->last_timing; 828 u32 val; 829 830 if (!timing) 831 return; 832 833 /* Wait until the state machine has settled */ 834 emc_seq_wait_clkchange(emc); 835 836 /* Restore AUTO_CAL */ 837 if (timing->emc_ctt_term_ctrl != last->emc_ctt_term_ctrl) 838 writel(timing->emc_auto_cal_interval, 839 emc->regs + EMC_AUTO_CAL_INTERVAL); 840 841 /* Restore dynamic self-refresh */ 842 if (timing->emc_cfg & EMC_CFG_PWR_MASK) 843 writel(timing->emc_cfg, emc->regs + EMC_CFG); 844 845 /* Set ZCAL wait count */ 846 writel(timing->emc_zcal_cnt_long, emc->regs + EMC_ZCAL_WAIT_CNT); 847 848 /* LPDDR3: Turn off BGBIAS if low frequency */ 849 if (emc->dram_type == DRAM_TYPE_LPDDR3 && 850 timing->emc_bgbias_ctl0 & 851 EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_RX) { 852 val = timing->emc_bgbias_ctl0; 853 val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD_IBIAS_VTTGEN; 854 val |= EMC_BGBIAS_CTL0_BIAS0_DSC_E_PWRD; 855 writel(val, emc->regs + EMC_BGBIAS_CTL0); 856 } else { 857 if (emc->dram_type == DRAM_TYPE_DDR3 && 858 readl(emc->regs + EMC_BGBIAS_CTL0) != 859 timing->emc_bgbias_ctl0) { 860 writel(timing->emc_bgbias_ctl0, 861 emc->regs + EMC_BGBIAS_CTL0); 862 } 863 864 writel(timing->emc_auto_cal_interval, 865 emc->regs + EMC_AUTO_CAL_INTERVAL); 866 } 867 868 /* Wait for timing to settle */ 869 udelay(2); 870 871 /* Reprogram SEL_DPD_CTRL */ 872 writel(timing->emc_sel_dpd_ctrl, emc->regs + EMC_SEL_DPD_CTRL); 873 emc_seq_update_timing(emc); 874 875 emc->last_timing = *timing; 876} 877 878/* Initialization and deinitialization */ 879 880static void emc_read_current_timing(struct tegra_emc *emc, 881 struct emc_timing *timing) 882{ 883 unsigned int i; 884 885 for (i = 0; i < ARRAY_SIZE(emc_burst_regs); ++i) 886 timing->emc_burst_data[i] = 887 readl(emc->regs + emc_burst_regs[i]); 888 889 timing->emc_cfg = readl(emc->regs + EMC_CFG); 890 891 timing->emc_auto_cal_interval = 0; 892 timing->emc_zcal_cnt_long = 0; 893 timing->emc_mode_1 = 0; 894 timing->emc_mode_2 = 0; 895 timing->emc_mode_4 = 0; 896 timing->emc_mode_reset = 0; 897} 898 899static int emc_init(struct tegra_emc *emc) 900{ 901 emc->dram_type = readl(emc->regs + EMC_FBIO_CFG5); 902 903 if (emc->dram_type & EMC_FBIO_CFG5_DRAM_WIDTH_X64) 904 emc->dram_bus_width = 64; 905 else 906 emc->dram_bus_width = 32; 907 908 dev_info_once(emc->dev, "%ubit DRAM bus\n", emc->dram_bus_width); 909 910 emc->dram_type &= EMC_FBIO_CFG5_DRAM_TYPE_MASK; 911 emc->dram_type >>= EMC_FBIO_CFG5_DRAM_TYPE_SHIFT; 912 913 emc->dram_num = tegra_mc_get_emem_device_count(emc->mc); 914 915 emc_read_current_timing(emc, &emc->last_timing); 916 917 return 0; 918} 919 920static int load_one_timing_from_dt(struct tegra_emc *emc, 921 struct emc_timing *timing, 922 struct device_node *node) 923{ 924 u32 value; 925 int err; 926 927 err = of_property_read_u32(node, "clock-frequency", &value); 928 if (err) { 929 dev_err(emc->dev, "timing %pOFn: failed to read rate: %d\n", 930 node, err); 931 return err; 932 } 933 934 timing->rate = value; 935 936 err = of_property_read_u32_array(node, "nvidia,emc-configuration", 937 timing->emc_burst_data, 938 ARRAY_SIZE(timing->emc_burst_data)); 939 if (err) { 940 dev_err(emc->dev, 941 "timing %pOFn: failed to read emc burst data: %d\n", 942 node, err); 943 return err; 944 } 945 946#define EMC_READ_PROP(prop, dtprop) { \ 947 err = of_property_read_u32(node, dtprop, &timing->prop); \ 948 if (err) { \ 949 dev_err(emc->dev, "timing %pOFn: failed to read " #prop ": %d\n", \ 950 node, err); \ 951 return err; \ 952 } \ 953} 954 955 EMC_READ_PROP(emc_auto_cal_config, "nvidia,emc-auto-cal-config") 956 EMC_READ_PROP(emc_auto_cal_config2, "nvidia,emc-auto-cal-config2") 957 EMC_READ_PROP(emc_auto_cal_config3, "nvidia,emc-auto-cal-config3") 958 EMC_READ_PROP(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval") 959 EMC_READ_PROP(emc_bgbias_ctl0, "nvidia,emc-bgbias-ctl0") 960 EMC_READ_PROP(emc_cfg, "nvidia,emc-cfg") 961 EMC_READ_PROP(emc_cfg_2, "nvidia,emc-cfg-2") 962 EMC_READ_PROP(emc_ctt_term_ctrl, "nvidia,emc-ctt-term-ctrl") 963 EMC_READ_PROP(emc_mode_1, "nvidia,emc-mode-1") 964 EMC_READ_PROP(emc_mode_2, "nvidia,emc-mode-2") 965 EMC_READ_PROP(emc_mode_4, "nvidia,emc-mode-4") 966 EMC_READ_PROP(emc_mode_reset, "nvidia,emc-mode-reset") 967 EMC_READ_PROP(emc_mrs_wait_cnt, "nvidia,emc-mrs-wait-cnt") 968 EMC_READ_PROP(emc_sel_dpd_ctrl, "nvidia,emc-sel-dpd-ctrl") 969 EMC_READ_PROP(emc_xm2dqspadctrl2, "nvidia,emc-xm2dqspadctrl2") 970 EMC_READ_PROP(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long") 971 EMC_READ_PROP(emc_zcal_interval, "nvidia,emc-zcal-interval") 972 973#undef EMC_READ_PROP 974 975 return 0; 976} 977 978static int cmp_timings(const void *_a, const void *_b) 979{ 980 const struct emc_timing *a = _a; 981 const struct emc_timing *b = _b; 982 983 if (a->rate < b->rate) 984 return -1; 985 else if (a->rate == b->rate) 986 return 0; 987 else 988 return 1; 989} 990 991static int tegra_emc_load_timings_from_dt(struct tegra_emc *emc, 992 struct device_node *node) 993{ 994 int child_count = of_get_child_count(node); 995 struct device_node *child; 996 struct emc_timing *timing; 997 unsigned int i = 0; 998 int err; 999 1000 emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing), 1001 GFP_KERNEL); 1002 if (!emc->timings) 1003 return -ENOMEM; 1004 1005 emc->num_timings = child_count; 1006 1007 for_each_child_of_node(node, child) { 1008 timing = &emc->timings[i++]; 1009 1010 err = load_one_timing_from_dt(emc, timing, child); 1011 if (err) { 1012 of_node_put(child); 1013 return err; 1014 } 1015 } 1016 1017 sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings, 1018 NULL); 1019 1020 return 0; 1021} 1022 1023static const struct of_device_id tegra_emc_of_match[] = { 1024 { .compatible = "nvidia,tegra124-emc" }, 1025 { .compatible = "nvidia,tegra132-emc" }, 1026 {} 1027}; 1028MODULE_DEVICE_TABLE(of, tegra_emc_of_match); 1029 1030static struct device_node * 1031tegra_emc_find_node_by_ram_code(struct device_node *node, u32 ram_code) 1032{ 1033 struct device_node *np; 1034 int err; 1035 1036 for_each_child_of_node(node, np) { 1037 u32 value; 1038 1039 err = of_property_read_u32(np, "nvidia,ram-code", &value); 1040 if (err || (value != ram_code)) 1041 continue; 1042 1043 return np; 1044 } 1045 1046 return NULL; 1047} 1048 1049static void tegra_emc_rate_requests_init(struct tegra_emc *emc) 1050{ 1051 unsigned int i; 1052 1053 for (i = 0; i < EMC_RATE_TYPE_MAX; i++) { 1054 emc->requested_rate[i].min_rate = 0; 1055 emc->requested_rate[i].max_rate = ULONG_MAX; 1056 } 1057} 1058 1059static int emc_request_rate(struct tegra_emc *emc, 1060 unsigned long new_min_rate, 1061 unsigned long new_max_rate, 1062 enum emc_rate_request_type type) 1063{ 1064 struct emc_rate_request *req = emc->requested_rate; 1065 unsigned long min_rate = 0, max_rate = ULONG_MAX; 1066 unsigned int i; 1067 int err; 1068 1069 /* select minimum and maximum rates among the requested rates */ 1070 for (i = 0; i < EMC_RATE_TYPE_MAX; i++, req++) { 1071 if (i == type) { 1072 min_rate = max(new_min_rate, min_rate); 1073 max_rate = min(new_max_rate, max_rate); 1074 } else { 1075 min_rate = max(req->min_rate, min_rate); 1076 max_rate = min(req->max_rate, max_rate); 1077 } 1078 } 1079 1080 if (min_rate > max_rate) { 1081 dev_err_ratelimited(emc->dev, "%s: type %u: out of range: %lu %lu\n", 1082 __func__, type, min_rate, max_rate); 1083 return -ERANGE; 1084 } 1085 1086 /* 1087 * EMC rate-changes should go via OPP API because it manages voltage 1088 * changes. 1089 */ 1090 err = dev_pm_opp_set_rate(emc->dev, min_rate); 1091 if (err) 1092 return err; 1093 1094 emc->requested_rate[type].min_rate = new_min_rate; 1095 emc->requested_rate[type].max_rate = new_max_rate; 1096 1097 return 0; 1098} 1099 1100static int emc_set_min_rate(struct tegra_emc *emc, unsigned long rate, 1101 enum emc_rate_request_type type) 1102{ 1103 struct emc_rate_request *req = &emc->requested_rate[type]; 1104 int ret; 1105 1106 mutex_lock(&emc->rate_lock); 1107 ret = emc_request_rate(emc, rate, req->max_rate, type); 1108 mutex_unlock(&emc->rate_lock); 1109 1110 return ret; 1111} 1112 1113static int emc_set_max_rate(struct tegra_emc *emc, unsigned long rate, 1114 enum emc_rate_request_type type) 1115{ 1116 struct emc_rate_request *req = &emc->requested_rate[type]; 1117 int ret; 1118 1119 mutex_lock(&emc->rate_lock); 1120 ret = emc_request_rate(emc, req->min_rate, rate, type); 1121 mutex_unlock(&emc->rate_lock); 1122 1123 return ret; 1124} 1125 1126/* 1127 * debugfs interface 1128 * 1129 * The memory controller driver exposes some files in debugfs that can be used 1130 * to control the EMC frequency. The top-level directory can be found here: 1131 * 1132 * /sys/kernel/debug/emc 1133 * 1134 * It contains the following files: 1135 * 1136 * - available_rates: This file contains a list of valid, space-separated 1137 * EMC frequencies. 1138 * 1139 * - min_rate: Writing a value to this file sets the given frequency as the 1140 * floor of the permitted range. If this is higher than the currently 1141 * configured EMC frequency, this will cause the frequency to be 1142 * increased so that it stays within the valid range. 1143 * 1144 * - max_rate: Similarily to the min_rate file, writing a value to this file 1145 * sets the given frequency as the ceiling of the permitted range. If 1146 * the value is lower than the currently configured EMC frequency, this 1147 * will cause the frequency to be decreased so that it stays within the 1148 * valid range. 1149 */ 1150 1151static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate) 1152{ 1153 unsigned int i; 1154 1155 for (i = 0; i < emc->num_timings; i++) 1156 if (rate == emc->timings[i].rate) 1157 return true; 1158 1159 return false; 1160} 1161 1162static int tegra_emc_debug_available_rates_show(struct seq_file *s, 1163 void *data) 1164{ 1165 struct tegra_emc *emc = s->private; 1166 const char *prefix = ""; 1167 unsigned int i; 1168 1169 for (i = 0; i < emc->num_timings; i++) { 1170 seq_printf(s, "%s%lu", prefix, emc->timings[i].rate); 1171 prefix = " "; 1172 } 1173 1174 seq_puts(s, "\n"); 1175 1176 return 0; 1177} 1178 1179DEFINE_SHOW_ATTRIBUTE(tegra_emc_debug_available_rates); 1180 1181static int tegra_emc_debug_min_rate_get(void *data, u64 *rate) 1182{ 1183 struct tegra_emc *emc = data; 1184 1185 *rate = emc->debugfs.min_rate; 1186 1187 return 0; 1188} 1189 1190static int tegra_emc_debug_min_rate_set(void *data, u64 rate) 1191{ 1192 struct tegra_emc *emc = data; 1193 int err; 1194 1195 if (!tegra_emc_validate_rate(emc, rate)) 1196 return -EINVAL; 1197 1198 err = emc_set_min_rate(emc, rate, EMC_RATE_DEBUG); 1199 if (err < 0) 1200 return err; 1201 1202 emc->debugfs.min_rate = rate; 1203 1204 return 0; 1205} 1206 1207DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_min_rate_fops, 1208 tegra_emc_debug_min_rate_get, 1209 tegra_emc_debug_min_rate_set, "%llu\n"); 1210 1211static int tegra_emc_debug_max_rate_get(void *data, u64 *rate) 1212{ 1213 struct tegra_emc *emc = data; 1214 1215 *rate = emc->debugfs.max_rate; 1216 1217 return 0; 1218} 1219 1220static int tegra_emc_debug_max_rate_set(void *data, u64 rate) 1221{ 1222 struct tegra_emc *emc = data; 1223 int err; 1224 1225 if (!tegra_emc_validate_rate(emc, rate)) 1226 return -EINVAL; 1227 1228 err = emc_set_max_rate(emc, rate, EMC_RATE_DEBUG); 1229 if (err < 0) 1230 return err; 1231 1232 emc->debugfs.max_rate = rate; 1233 1234 return 0; 1235} 1236 1237DEFINE_DEBUGFS_ATTRIBUTE(tegra_emc_debug_max_rate_fops, 1238 tegra_emc_debug_max_rate_get, 1239 tegra_emc_debug_max_rate_set, "%llu\n"); 1240 1241static void emc_debugfs_init(struct device *dev, struct tegra_emc *emc) 1242{ 1243 unsigned int i; 1244 int err; 1245 1246 emc->debugfs.min_rate = ULONG_MAX; 1247 emc->debugfs.max_rate = 0; 1248 1249 for (i = 0; i < emc->num_timings; i++) { 1250 if (emc->timings[i].rate < emc->debugfs.min_rate) 1251 emc->debugfs.min_rate = emc->timings[i].rate; 1252 1253 if (emc->timings[i].rate > emc->debugfs.max_rate) 1254 emc->debugfs.max_rate = emc->timings[i].rate; 1255 } 1256 1257 if (!emc->num_timings) { 1258 emc->debugfs.min_rate = clk_get_rate(emc->clk); 1259 emc->debugfs.max_rate = emc->debugfs.min_rate; 1260 } 1261 1262 err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, 1263 emc->debugfs.max_rate); 1264 if (err < 0) { 1265 dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n", 1266 emc->debugfs.min_rate, emc->debugfs.max_rate, 1267 emc->clk); 1268 return; 1269 } 1270 1271 emc->debugfs.root = debugfs_create_dir("emc", NULL); 1272 1273 debugfs_create_file("available_rates", 0444, emc->debugfs.root, emc, 1274 &tegra_emc_debug_available_rates_fops); 1275 debugfs_create_file("min_rate", 0644, emc->debugfs.root, 1276 emc, &tegra_emc_debug_min_rate_fops); 1277 debugfs_create_file("max_rate", 0644, emc->debugfs.root, 1278 emc, &tegra_emc_debug_max_rate_fops); 1279} 1280 1281static inline struct tegra_emc * 1282to_tegra_emc_provider(struct icc_provider *provider) 1283{ 1284 return container_of(provider, struct tegra_emc, provider); 1285} 1286 1287static struct icc_node_data * 1288emc_of_icc_xlate_extended(const struct of_phandle_args *spec, void *data) 1289{ 1290 struct icc_provider *provider = data; 1291 struct icc_node_data *ndata; 1292 struct icc_node *node; 1293 1294 /* External Memory is the only possible ICC route */ 1295 list_for_each_entry(node, &provider->nodes, node_list) { 1296 if (node->id != TEGRA_ICC_EMEM) 1297 continue; 1298 1299 ndata = kzalloc(sizeof(*ndata), GFP_KERNEL); 1300 if (!ndata) 1301 return ERR_PTR(-ENOMEM); 1302 1303 /* 1304 * SRC and DST nodes should have matching TAG in order to have 1305 * it set by default for a requested path. 1306 */ 1307 ndata->tag = TEGRA_MC_ICC_TAG_ISO; 1308 ndata->node = node; 1309 1310 return ndata; 1311 } 1312 1313 return ERR_PTR(-EPROBE_DEFER); 1314} 1315 1316static int emc_icc_set(struct icc_node *src, struct icc_node *dst) 1317{ 1318 struct tegra_emc *emc = to_tegra_emc_provider(dst->provider); 1319 unsigned long long peak_bw = icc_units_to_bps(dst->peak_bw); 1320 unsigned long long avg_bw = icc_units_to_bps(dst->avg_bw); 1321 unsigned long long rate = max(avg_bw, peak_bw); 1322 unsigned int dram_data_bus_width_bytes; 1323 const unsigned int ddr = 2; 1324 int err; 1325 1326 /* 1327 * Tegra124 EMC runs on a clock rate of SDRAM bus. This means that 1328 * EMC clock rate is twice smaller than the peak data rate because 1329 * data is sampled on both EMC clock edges. 1330 */ 1331 dram_data_bus_width_bytes = emc->dram_bus_width / 8; 1332 do_div(rate, ddr * dram_data_bus_width_bytes); 1333 rate = min_t(u64, rate, U32_MAX); 1334 1335 err = emc_set_min_rate(emc, rate, EMC_RATE_ICC); 1336 if (err) 1337 return err; 1338 1339 return 0; 1340} 1341 1342static int tegra_emc_interconnect_init(struct tegra_emc *emc) 1343{ 1344 const struct tegra_mc_soc *soc = emc->mc->soc; 1345 struct icc_node *node; 1346 int err; 1347 1348 emc->provider.dev = emc->dev; 1349 emc->provider.set = emc_icc_set; 1350 emc->provider.data = &emc->provider; 1351 emc->provider.aggregate = soc->icc_ops->aggregate; 1352 emc->provider.xlate_extended = emc_of_icc_xlate_extended; 1353 1354 icc_provider_init(&emc->provider); 1355 1356 /* create External Memory Controller node */ 1357 node = icc_node_create(TEGRA_ICC_EMC); 1358 if (IS_ERR(node)) { 1359 err = PTR_ERR(node); 1360 goto err_msg; 1361 } 1362 1363 node->name = "External Memory Controller"; 1364 icc_node_add(node, &emc->provider); 1365 1366 /* link External Memory Controller to External Memory (DRAM) */ 1367 err = icc_link_create(node, TEGRA_ICC_EMEM); 1368 if (err) 1369 goto remove_nodes; 1370 1371 /* create External Memory node */ 1372 node = icc_node_create(TEGRA_ICC_EMEM); 1373 if (IS_ERR(node)) { 1374 err = PTR_ERR(node); 1375 goto remove_nodes; 1376 } 1377 1378 node->name = "External Memory (DRAM)"; 1379 icc_node_add(node, &emc->provider); 1380 1381 err = icc_provider_register(&emc->provider); 1382 if (err) 1383 goto remove_nodes; 1384 1385 return 0; 1386 1387remove_nodes: 1388 icc_nodes_remove(&emc->provider); 1389err_msg: 1390 dev_err(emc->dev, "failed to initialize ICC: %d\n", err); 1391 1392 return err; 1393} 1394 1395static int tegra_emc_opp_table_init(struct tegra_emc *emc) 1396{ 1397 u32 hw_version = BIT(tegra_sku_info.soc_speedo_id); 1398 int opp_token, err; 1399 1400 err = dev_pm_opp_set_supported_hw(emc->dev, &hw_version, 1); 1401 if (err < 0) { 1402 dev_err(emc->dev, "failed to set OPP supported HW: %d\n", err); 1403 return err; 1404 } 1405 opp_token = err; 1406 1407 err = dev_pm_opp_of_add_table(emc->dev); 1408 if (err) { 1409 if (err == -ENODEV) 1410 dev_err(emc->dev, "OPP table not found, please update your device tree\n"); 1411 else 1412 dev_err(emc->dev, "failed to add OPP table: %d\n", err); 1413 1414 goto put_hw_table; 1415 } 1416 1417 dev_info_once(emc->dev, "OPP HW ver. 0x%x, current clock rate %lu MHz\n", 1418 hw_version, clk_get_rate(emc->clk) / 1000000); 1419 1420 /* first dummy rate-set initializes voltage state */ 1421 err = dev_pm_opp_set_rate(emc->dev, clk_get_rate(emc->clk)); 1422 if (err) { 1423 dev_err(emc->dev, "failed to initialize OPP clock: %d\n", err); 1424 goto remove_table; 1425 } 1426 1427 return 0; 1428 1429remove_table: 1430 dev_pm_opp_of_remove_table(emc->dev); 1431put_hw_table: 1432 dev_pm_opp_put_supported_hw(opp_token); 1433 1434 return err; 1435} 1436 1437static void devm_tegra_emc_unset_callback(void *data) 1438{ 1439 tegra124_clk_set_emc_callbacks(NULL, NULL); 1440} 1441 1442static int tegra_emc_probe(struct platform_device *pdev) 1443{ 1444 struct device_node *np; 1445 struct tegra_emc *emc; 1446 u32 ram_code; 1447 int err; 1448 1449 emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL); 1450 if (!emc) 1451 return -ENOMEM; 1452 1453 mutex_init(&emc->rate_lock); 1454 emc->dev = &pdev->dev; 1455 1456 emc->regs = devm_platform_ioremap_resource(pdev, 0); 1457 if (IS_ERR(emc->regs)) 1458 return PTR_ERR(emc->regs); 1459 1460 emc->mc = devm_tegra_memory_controller_get(&pdev->dev); 1461 if (IS_ERR(emc->mc)) 1462 return PTR_ERR(emc->mc); 1463 1464 ram_code = tegra_read_ram_code(); 1465 1466 np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code); 1467 if (np) { 1468 err = tegra_emc_load_timings_from_dt(emc, np); 1469 of_node_put(np); 1470 if (err) 1471 return err; 1472 } else { 1473 dev_info_once(&pdev->dev, 1474 "no memory timings for RAM code %u found in DT\n", 1475 ram_code); 1476 } 1477 1478 err = emc_init(emc); 1479 if (err) { 1480 dev_err(&pdev->dev, "EMC initialization failed: %d\n", err); 1481 return err; 1482 } 1483 1484 platform_set_drvdata(pdev, emc); 1485 1486 tegra124_clk_set_emc_callbacks(tegra_emc_prepare_timing_change, 1487 tegra_emc_complete_timing_change); 1488 1489 err = devm_add_action_or_reset(&pdev->dev, devm_tegra_emc_unset_callback, 1490 NULL); 1491 if (err) 1492 return err; 1493 1494 emc->clk = devm_clk_get(&pdev->dev, "emc"); 1495 if (IS_ERR(emc->clk)) { 1496 err = PTR_ERR(emc->clk); 1497 dev_err(&pdev->dev, "failed to get EMC clock: %d\n", err); 1498 return err; 1499 } 1500 1501 err = tegra_emc_opp_table_init(emc); 1502 if (err) 1503 return err; 1504 1505 tegra_emc_rate_requests_init(emc); 1506 1507 if (IS_ENABLED(CONFIG_DEBUG_FS)) 1508 emc_debugfs_init(&pdev->dev, emc); 1509 1510 tegra_emc_interconnect_init(emc); 1511 1512 /* 1513 * Don't allow the kernel module to be unloaded. Unloading adds some 1514 * extra complexity which doesn't really worth the effort in a case of 1515 * this driver. 1516 */ 1517 try_module_get(THIS_MODULE); 1518 1519 return 0; 1520}; 1521 1522static struct platform_driver tegra_emc_driver = { 1523 .probe = tegra_emc_probe, 1524 .driver = { 1525 .name = "tegra-emc", 1526 .of_match_table = tegra_emc_of_match, 1527 .suppress_bind_attrs = true, 1528 .sync_state = icc_sync_state, 1529 }, 1530}; 1531module_platform_driver(tegra_emc_driver); 1532 1533MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>"); 1534MODULE_DESCRIPTION("NVIDIA Tegra124 EMC driver"); 1535MODULE_LICENSE("GPL v2"); 1536