1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Tegra30 External Memory Controller driver 4 * 5 * Based on downstream driver from NVIDIA and tegra124-emc.c 6 * Copyright (C) 2011-2014 NVIDIA Corporation 7 * 8 * Author: Dmitry Osipenko <digetx@gmail.com> 9 * Copyright (C) 2019 GRATE-DRIVER project 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/clk/tegra.h> 14 #include <linux/debugfs.h> 15 #include <linux/delay.h> 16 #include <linux/err.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/iopoll.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/of_platform.h> 23 #include <linux/platform_device.h> 24 #include <linux/sort.h> 25 #include <linux/types.h> 26 27 #include <soc/tegra/fuse.h> 28 29 #include "mc.h" 30 31 #define EMC_INTSTATUS 0x000 32 #define EMC_INTMASK 0x004 33 #define EMC_DBG 0x008 34 #define EMC_CFG 0x00c 35 #define EMC_REFCTRL 0x020 36 #define EMC_TIMING_CONTROL 0x028 37 #define EMC_RC 0x02c 38 #define EMC_RFC 0x030 39 #define EMC_RAS 0x034 40 #define EMC_RP 0x038 41 #define EMC_R2W 0x03c 42 #define EMC_W2R 0x040 43 #define EMC_R2P 0x044 44 #define EMC_W2P 0x048 45 #define EMC_RD_RCD 0x04c 46 #define EMC_WR_RCD 0x050 47 #define EMC_RRD 0x054 48 #define EMC_REXT 0x058 49 #define EMC_WDV 0x05c 50 #define EMC_QUSE 0x060 51 #define EMC_QRST 0x064 52 #define EMC_QSAFE 0x068 53 #define EMC_RDV 0x06c 54 #define EMC_REFRESH 0x070 55 #define EMC_BURST_REFRESH_NUM 0x074 56 #define EMC_PDEX2WR 0x078 57 #define EMC_PDEX2RD 0x07c 58 #define EMC_PCHG2PDEN 0x080 59 #define EMC_ACT2PDEN 0x084 60 #define EMC_AR2PDEN 0x088 61 #define EMC_RW2PDEN 0x08c 62 #define EMC_TXSR 0x090 63 #define EMC_TCKE 0x094 64 #define EMC_TFAW 0x098 65 #define EMC_TRPAB 0x09c 66 #define EMC_TCLKSTABLE 0x0a0 67 #define EMC_TCLKSTOP 0x0a4 68 #define EMC_TREFBW 0x0a8 69 #define EMC_QUSE_EXTRA 0x0ac 70 #define EMC_ODT_WRITE 0x0b0 71 #define EMC_ODT_READ 0x0b4 72 #define EMC_WEXT 0x0b8 73 #define EMC_CTT 0x0bc 74 #define EMC_MRS_WAIT_CNT 0x0c8 75 #define EMC_MRS 0x0cc 76 #define EMC_EMRS 0x0d0 77 #define EMC_SELF_REF 0x0e0 78 #define EMC_MRW 0x0e8 79 #define EMC_XM2DQSPADCTRL3 0x0f8 80 #define EMC_FBIO_SPARE 0x100 81 #define EMC_FBIO_CFG5 0x104 82 #define EMC_FBIO_CFG6 0x114 83 #define EMC_CFG_RSV 0x120 84 #define EMC_AUTO_CAL_CONFIG 0x2a4 85 #define EMC_AUTO_CAL_INTERVAL 0x2a8 86 #define EMC_AUTO_CAL_STATUS 0x2ac 87 #define EMC_STATUS 0x2b4 88 #define EMC_CFG_2 0x2b8 89 #define EMC_CFG_DIG_DLL 0x2bc 90 #define EMC_CFG_DIG_DLL_PERIOD 0x2c0 91 #define EMC_CTT_DURATION 0x2d8 92 #define EMC_CTT_TERM_CTRL 0x2dc 93 #define EMC_ZCAL_INTERVAL 0x2e0 94 #define EMC_ZCAL_WAIT_CNT 0x2e4 95 #define EMC_ZQ_CAL 0x2ec 96 #define EMC_XM2CMDPADCTRL 0x2f0 97 #define EMC_XM2DQSPADCTRL2 0x2fc 98 #define EMC_XM2DQPADCTRL2 0x304 99 #define EMC_XM2CLKPADCTRL 0x308 100 #define EMC_XM2COMPPADCTRL 0x30c 101 #define EMC_XM2VTTGENPADCTRL 0x310 102 #define EMC_XM2VTTGENPADCTRL2 0x314 103 #define EMC_XM2QUSEPADCTRL 0x318 104 #define EMC_DLL_XFORM_DQS0 0x328 105 #define EMC_DLL_XFORM_DQS1 0x32c 106 #define EMC_DLL_XFORM_DQS2 0x330 107 #define EMC_DLL_XFORM_DQS3 0x334 108 #define EMC_DLL_XFORM_DQS4 0x338 109 #define EMC_DLL_XFORM_DQS5 0x33c 110 #define EMC_DLL_XFORM_DQS6 0x340 111 #define EMC_DLL_XFORM_DQS7 0x344 112 #define EMC_DLL_XFORM_QUSE0 0x348 113 #define EMC_DLL_XFORM_QUSE1 0x34c 114 #define EMC_DLL_XFORM_QUSE2 0x350 115 #define EMC_DLL_XFORM_QUSE3 0x354 116 #define EMC_DLL_XFORM_QUSE4 0x358 117 #define EMC_DLL_XFORM_QUSE5 0x35c 118 #define EMC_DLL_XFORM_QUSE6 0x360 119 #define EMC_DLL_XFORM_QUSE7 0x364 120 #define EMC_DLL_XFORM_DQ0 0x368 121 #define EMC_DLL_XFORM_DQ1 0x36c 122 #define EMC_DLL_XFORM_DQ2 0x370 123 #define EMC_DLL_XFORM_DQ3 0x374 124 #define EMC_DLI_TRIM_TXDQS0 0x3a8 125 #define EMC_DLI_TRIM_TXDQS1 0x3ac 126 #define EMC_DLI_TRIM_TXDQS2 0x3b0 127 #define EMC_DLI_TRIM_TXDQS3 0x3b4 128 #define EMC_DLI_TRIM_TXDQS4 0x3b8 129 #define EMC_DLI_TRIM_TXDQS5 0x3bc 130 #define EMC_DLI_TRIM_TXDQS6 0x3c0 131 #define EMC_DLI_TRIM_TXDQS7 0x3c4 132 #define EMC_STALL_THEN_EXE_BEFORE_CLKCHANGE 0x3c8 133 #define EMC_STALL_THEN_EXE_AFTER_CLKCHANGE 0x3cc 134 #define EMC_UNSTALL_RW_AFTER_CLKCHANGE 0x3d0 135 #define EMC_SEL_DPD_CTRL 0x3d8 136 #define EMC_PRE_REFRESH_REQ_CNT 0x3dc 137 #define EMC_DYN_SELF_REF_CONTROL 0x3e0 138 #define EMC_TXSRDLL 0x3e4 139 140 #define EMC_STATUS_TIMING_UPDATE_STALLED BIT(23) 141 142 #define EMC_MODE_SET_DLL_RESET BIT(8) 143 #define EMC_MODE_SET_LONG_CNT BIT(26) 144 145 #define EMC_SELF_REF_CMD_ENABLED BIT(0) 146 147 #define DRAM_DEV_SEL_ALL (0 << 30) 148 #define DRAM_DEV_SEL_0 (2 << 30) 149 #define DRAM_DEV_SEL_1 (1 << 30) 150 #define DRAM_BROADCAST(num) \ 151 ((num) > 1 ? DRAM_DEV_SEL_ALL : DRAM_DEV_SEL_0) 152 153 #define EMC_ZQ_CAL_CMD BIT(0) 154 #define EMC_ZQ_CAL_LONG BIT(4) 155 #define EMC_ZQ_CAL_LONG_CMD_DEV0 \ 156 (DRAM_DEV_SEL_0 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD) 157 #define EMC_ZQ_CAL_LONG_CMD_DEV1 \ 158 (DRAM_DEV_SEL_1 | EMC_ZQ_CAL_LONG | EMC_ZQ_CAL_CMD) 159 160 #define EMC_DBG_READ_MUX_ASSEMBLY BIT(0) 161 #define EMC_DBG_WRITE_MUX_ACTIVE BIT(1) 162 #define EMC_DBG_FORCE_UPDATE BIT(2) 163 #define EMC_DBG_CFG_PRIORITY BIT(24) 164 165 #define EMC_CFG5_QUSE_MODE_SHIFT 13 166 #define EMC_CFG5_QUSE_MODE_MASK (7 << EMC_CFG5_QUSE_MODE_SHIFT) 167 168 #define EMC_CFG5_QUSE_MODE_INTERNAL_LPBK 2 169 #define EMC_CFG5_QUSE_MODE_PULSE_INTERN 3 170 171 #define EMC_SEL_DPD_CTRL_QUSE_DPD_ENABLE BIT(9) 172 173 #define EMC_XM2COMPPADCTRL_VREF_CAL_ENABLE BIT(10) 174 175 #define EMC_XM2QUSEPADCTRL_IVREF_ENABLE BIT(4) 176 177 #define EMC_XM2DQSPADCTRL2_VREF_ENABLE BIT(5) 178 #define EMC_XM2DQSPADCTRL3_VREF_ENABLE BIT(5) 179 180 #define EMC_AUTO_CAL_STATUS_ACTIVE BIT(31) 181 182 #define EMC_FBIO_CFG5_DRAM_TYPE_MASK 0x3 183 184 #define EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK 0x3ff 185 #define EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT 16 186 #define EMC_MRS_WAIT_CNT_LONG_WAIT_MASK \ 187 (0x3ff << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) 188 189 #define EMC_REFCTRL_DEV_SEL_MASK 0x3 190 #define EMC_REFCTRL_ENABLE BIT(31) 191 #define EMC_REFCTRL_ENABLE_ALL(num) \ 192 (((num) > 1 ? 0 : 2) | EMC_REFCTRL_ENABLE) 193 #define EMC_REFCTRL_DISABLE_ALL(num) ((num) > 1 ? 0 : 2) 194 195 #define EMC_CFG_PERIODIC_QRST BIT(21) 196 #define EMC_CFG_DYN_SREF_ENABLE BIT(28) 197 198 #define EMC_CLKCHANGE_REQ_ENABLE BIT(0) 199 #define EMC_CLKCHANGE_PD_ENABLE BIT(1) 200 #define EMC_CLKCHANGE_SR_ENABLE BIT(2) 201 202 #define EMC_TIMING_UPDATE BIT(0) 203 204 #define EMC_REFRESH_OVERFLOW_INT BIT(3) 205 #define EMC_CLKCHANGE_COMPLETE_INT BIT(4) 206 207 enum emc_dram_type { 208 DRAM_TYPE_DDR3, 209 DRAM_TYPE_DDR1, 210 DRAM_TYPE_LPDDR2, 211 DRAM_TYPE_DDR2, 212 }; 213 214 enum emc_dll_change { 215 DLL_CHANGE_NONE, 216 DLL_CHANGE_ON, 217 DLL_CHANGE_OFF 218 }; 219 220 static const u16 emc_timing_registers[] = { 221 [0] = EMC_RC, 222 [1] = EMC_RFC, 223 [2] = EMC_RAS, 224 [3] = EMC_RP, 225 [4] = EMC_R2W, 226 [5] = EMC_W2R, 227 [6] = EMC_R2P, 228 [7] = EMC_W2P, 229 [8] = EMC_RD_RCD, 230 [9] = EMC_WR_RCD, 231 [10] = EMC_RRD, 232 [11] = EMC_REXT, 233 [12] = EMC_WEXT, 234 [13] = EMC_WDV, 235 [14] = EMC_QUSE, 236 [15] = EMC_QRST, 237 [16] = EMC_QSAFE, 238 [17] = EMC_RDV, 239 [18] = EMC_REFRESH, 240 [19] = EMC_BURST_REFRESH_NUM, 241 [20] = EMC_PRE_REFRESH_REQ_CNT, 242 [21] = EMC_PDEX2WR, 243 [22] = EMC_PDEX2RD, 244 [23] = EMC_PCHG2PDEN, 245 [24] = EMC_ACT2PDEN, 246 [25] = EMC_AR2PDEN, 247 [26] = EMC_RW2PDEN, 248 [27] = EMC_TXSR, 249 [28] = EMC_TXSRDLL, 250 [29] = EMC_TCKE, 251 [30] = EMC_TFAW, 252 [31] = EMC_TRPAB, 253 [32] = EMC_TCLKSTABLE, 254 [33] = EMC_TCLKSTOP, 255 [34] = EMC_TREFBW, 256 [35] = EMC_QUSE_EXTRA, 257 [36] = EMC_FBIO_CFG6, 258 [37] = EMC_ODT_WRITE, 259 [38] = EMC_ODT_READ, 260 [39] = EMC_FBIO_CFG5, 261 [40] = EMC_CFG_DIG_DLL, 262 [41] = EMC_CFG_DIG_DLL_PERIOD, 263 [42] = EMC_DLL_XFORM_DQS0, 264 [43] = EMC_DLL_XFORM_DQS1, 265 [44] = EMC_DLL_XFORM_DQS2, 266 [45] = EMC_DLL_XFORM_DQS3, 267 [46] = EMC_DLL_XFORM_DQS4, 268 [47] = EMC_DLL_XFORM_DQS5, 269 [48] = EMC_DLL_XFORM_DQS6, 270 [49] = EMC_DLL_XFORM_DQS7, 271 [50] = EMC_DLL_XFORM_QUSE0, 272 [51] = EMC_DLL_XFORM_QUSE1, 273 [52] = EMC_DLL_XFORM_QUSE2, 274 [53] = EMC_DLL_XFORM_QUSE3, 275 [54] = EMC_DLL_XFORM_QUSE4, 276 [55] = EMC_DLL_XFORM_QUSE5, 277 [56] = EMC_DLL_XFORM_QUSE6, 278 [57] = EMC_DLL_XFORM_QUSE7, 279 [58] = EMC_DLI_TRIM_TXDQS0, 280 [59] = EMC_DLI_TRIM_TXDQS1, 281 [60] = EMC_DLI_TRIM_TXDQS2, 282 [61] = EMC_DLI_TRIM_TXDQS3, 283 [62] = EMC_DLI_TRIM_TXDQS4, 284 [63] = EMC_DLI_TRIM_TXDQS5, 285 [64] = EMC_DLI_TRIM_TXDQS6, 286 [65] = EMC_DLI_TRIM_TXDQS7, 287 [66] = EMC_DLL_XFORM_DQ0, 288 [67] = EMC_DLL_XFORM_DQ1, 289 [68] = EMC_DLL_XFORM_DQ2, 290 [69] = EMC_DLL_XFORM_DQ3, 291 [70] = EMC_XM2CMDPADCTRL, 292 [71] = EMC_XM2DQSPADCTRL2, 293 [72] = EMC_XM2DQPADCTRL2, 294 [73] = EMC_XM2CLKPADCTRL, 295 [74] = EMC_XM2COMPPADCTRL, 296 [75] = EMC_XM2VTTGENPADCTRL, 297 [76] = EMC_XM2VTTGENPADCTRL2, 298 [77] = EMC_XM2QUSEPADCTRL, 299 [78] = EMC_XM2DQSPADCTRL3, 300 [79] = EMC_CTT_TERM_CTRL, 301 [80] = EMC_ZCAL_INTERVAL, 302 [81] = EMC_ZCAL_WAIT_CNT, 303 [82] = EMC_MRS_WAIT_CNT, 304 [83] = EMC_AUTO_CAL_CONFIG, 305 [84] = EMC_CTT, 306 [85] = EMC_CTT_DURATION, 307 [86] = EMC_DYN_SELF_REF_CONTROL, 308 [87] = EMC_FBIO_SPARE, 309 [88] = EMC_CFG_RSV, 310 }; 311 312 struct emc_timing { 313 unsigned long rate; 314 315 u32 data[ARRAY_SIZE(emc_timing_registers)]; 316 317 u32 emc_auto_cal_interval; 318 u32 emc_mode_1; 319 u32 emc_mode_2; 320 u32 emc_mode_reset; 321 u32 emc_zcal_cnt_long; 322 bool emc_cfg_periodic_qrst; 323 bool emc_cfg_dyn_self_ref; 324 }; 325 326 struct tegra_emc { 327 struct device *dev; 328 struct tegra_mc *mc; 329 struct notifier_block clk_nb; 330 struct clk *clk; 331 void __iomem *regs; 332 unsigned int irq; 333 bool bad_state; 334 335 struct emc_timing *new_timing; 336 struct emc_timing *timings; 337 unsigned int num_timings; 338 339 u32 mc_override; 340 u32 emc_cfg; 341 342 u32 emc_mode_1; 343 u32 emc_mode_2; 344 u32 emc_mode_reset; 345 346 bool vref_cal_toggle : 1; 347 bool zcal_long : 1; 348 bool dll_on : 1; 349 350 struct { 351 struct dentry *root; 352 unsigned long min_rate; 353 unsigned long max_rate; 354 } debugfs; 355 }; 356 357 static int emc_seq_update_timing(struct tegra_emc *emc) 358 { 359 u32 val; 360 int err; 361 362 writel_relaxed(EMC_TIMING_UPDATE, emc->regs + EMC_TIMING_CONTROL); 363 364 err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_STATUS, val, 365 !(val & EMC_STATUS_TIMING_UPDATE_STALLED), 366 1, 200); 367 if (err) { 368 dev_err(emc->dev, "failed to update timing: %d\n", err); 369 return err; 370 } 371 372 return 0; 373 } 374 375 static irqreturn_t tegra_emc_isr(int irq, void *data) 376 { 377 struct tegra_emc *emc = data; 378 u32 intmask = EMC_REFRESH_OVERFLOW_INT; 379 u32 status; 380 381 status = readl_relaxed(emc->regs + EMC_INTSTATUS) & intmask; 382 if (!status) 383 return IRQ_NONE; 384 385 /* notify about HW problem */ 386 if (status & EMC_REFRESH_OVERFLOW_INT) 387 dev_err_ratelimited(emc->dev, 388 "refresh request overflow timeout\n"); 389 390 /* clear interrupts */ 391 writel_relaxed(status, emc->regs + EMC_INTSTATUS); 392 393 return IRQ_HANDLED; 394 } 395 396 static struct emc_timing *emc_find_timing(struct tegra_emc *emc, 397 unsigned long rate) 398 { 399 struct emc_timing *timing = NULL; 400 unsigned int i; 401 402 for (i = 0; i < emc->num_timings; i++) { 403 if (emc->timings[i].rate >= rate) { 404 timing = &emc->timings[i]; 405 break; 406 } 407 } 408 409 if (!timing) { 410 dev_err(emc->dev, "no timing for rate %lu\n", rate); 411 return NULL; 412 } 413 414 return timing; 415 } 416 417 static bool emc_dqs_preset(struct tegra_emc *emc, struct emc_timing *timing, 418 bool *schmitt_to_vref) 419 { 420 bool preset = false; 421 u32 val; 422 423 if (timing->data[71] & EMC_XM2DQSPADCTRL2_VREF_ENABLE) { 424 val = readl_relaxed(emc->regs + EMC_XM2DQSPADCTRL2); 425 426 if (!(val & EMC_XM2DQSPADCTRL2_VREF_ENABLE)) { 427 val |= EMC_XM2DQSPADCTRL2_VREF_ENABLE; 428 writel_relaxed(val, emc->regs + EMC_XM2DQSPADCTRL2); 429 430 preset = true; 431 } 432 } 433 434 if (timing->data[78] & EMC_XM2DQSPADCTRL3_VREF_ENABLE) { 435 val = readl_relaxed(emc->regs + EMC_XM2DQSPADCTRL3); 436 437 if (!(val & EMC_XM2DQSPADCTRL3_VREF_ENABLE)) { 438 val |= EMC_XM2DQSPADCTRL3_VREF_ENABLE; 439 writel_relaxed(val, emc->regs + EMC_XM2DQSPADCTRL3); 440 441 preset = true; 442 } 443 } 444 445 if (timing->data[77] & EMC_XM2QUSEPADCTRL_IVREF_ENABLE) { 446 val = readl_relaxed(emc->regs + EMC_XM2QUSEPADCTRL); 447 448 if (!(val & EMC_XM2QUSEPADCTRL_IVREF_ENABLE)) { 449 val |= EMC_XM2QUSEPADCTRL_IVREF_ENABLE; 450 writel_relaxed(val, emc->regs + EMC_XM2QUSEPADCTRL); 451 452 *schmitt_to_vref = true; 453 preset = true; 454 } 455 } 456 457 return preset; 458 } 459 460 static int emc_prepare_mc_clk_cfg(struct tegra_emc *emc, unsigned long rate) 461 { 462 struct tegra_mc *mc = emc->mc; 463 unsigned int misc0_index = 16; 464 unsigned int i; 465 bool same; 466 467 for (i = 0; i < mc->num_timings; i++) { 468 if (mc->timings[i].rate != rate) 469 continue; 470 471 if (mc->timings[i].emem_data[misc0_index] & BIT(27)) 472 same = true; 473 else 474 same = false; 475 476 return tegra20_clk_prepare_emc_mc_same_freq(emc->clk, same); 477 } 478 479 return -EINVAL; 480 } 481 482 static int emc_prepare_timing_change(struct tegra_emc *emc, unsigned long rate) 483 { 484 struct emc_timing *timing = emc_find_timing(emc, rate); 485 enum emc_dll_change dll_change; 486 enum emc_dram_type dram_type; 487 bool schmitt_to_vref = false; 488 unsigned int pre_wait = 0; 489 bool qrst_used = false; 490 unsigned int dram_num; 491 unsigned int i; 492 u32 fbio_cfg5; 493 u32 emc_dbg; 494 u32 val; 495 int err; 496 497 if (!timing || emc->bad_state) 498 return -EINVAL; 499 500 dev_dbg(emc->dev, "%s: using timing rate %lu for requested rate %lu\n", 501 __func__, timing->rate, rate); 502 503 emc->bad_state = true; 504 505 err = emc_prepare_mc_clk_cfg(emc, rate); 506 if (err) { 507 dev_err(emc->dev, "mc clock preparation failed: %d\n", err); 508 return err; 509 } 510 511 emc->vref_cal_toggle = false; 512 emc->mc_override = mc_readl(emc->mc, MC_EMEM_ARB_OVERRIDE); 513 emc->emc_cfg = readl_relaxed(emc->regs + EMC_CFG); 514 emc_dbg = readl_relaxed(emc->regs + EMC_DBG); 515 516 if (emc->dll_on == !!(timing->emc_mode_1 & 0x1)) 517 dll_change = DLL_CHANGE_NONE; 518 else if (timing->emc_mode_1 & 0x1) 519 dll_change = DLL_CHANGE_ON; 520 else 521 dll_change = DLL_CHANGE_OFF; 522 523 emc->dll_on = !!(timing->emc_mode_1 & 0x1); 524 525 if (timing->data[80] && !readl_relaxed(emc->regs + EMC_ZCAL_INTERVAL)) 526 emc->zcal_long = true; 527 else 528 emc->zcal_long = false; 529 530 fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5); 531 dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK; 532 533 dram_num = tegra_mc_get_emem_device_count(emc->mc); 534 535 /* disable dynamic self-refresh */ 536 if (emc->emc_cfg & EMC_CFG_DYN_SREF_ENABLE) { 537 emc->emc_cfg &= ~EMC_CFG_DYN_SREF_ENABLE; 538 writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG); 539 540 pre_wait = 5; 541 } 542 543 /* update MC arbiter settings */ 544 val = mc_readl(emc->mc, MC_EMEM_ARB_OUTSTANDING_REQ); 545 if (!(val & MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE) || 546 ((val & MC_EMEM_ARB_OUTSTANDING_REQ_MAX_MASK) > 0x50)) { 547 548 val = MC_EMEM_ARB_OUTSTANDING_REQ_LIMIT_ENABLE | 549 MC_EMEM_ARB_OUTSTANDING_REQ_HOLDOFF_OVERRIDE | 0x50; 550 mc_writel(emc->mc, val, MC_EMEM_ARB_OUTSTANDING_REQ); 551 mc_writel(emc->mc, MC_TIMING_UPDATE, MC_TIMING_CONTROL); 552 } 553 554 if (emc->mc_override & MC_EMEM_ARB_OVERRIDE_EACK_MASK) 555 mc_writel(emc->mc, 556 emc->mc_override & ~MC_EMEM_ARB_OVERRIDE_EACK_MASK, 557 MC_EMEM_ARB_OVERRIDE); 558 559 /* check DQ/DQS VREF delay */ 560 if (emc_dqs_preset(emc, timing, &schmitt_to_vref)) { 561 if (pre_wait < 3) 562 pre_wait = 3; 563 } 564 565 if (pre_wait) { 566 err = emc_seq_update_timing(emc); 567 if (err) 568 return err; 569 570 udelay(pre_wait); 571 } 572 573 /* disable auto-calibration if VREF mode is switching */ 574 if (timing->emc_auto_cal_interval) { 575 val = readl_relaxed(emc->regs + EMC_XM2COMPPADCTRL); 576 val ^= timing->data[74]; 577 578 if (val & EMC_XM2COMPPADCTRL_VREF_CAL_ENABLE) { 579 writel_relaxed(0, emc->regs + EMC_AUTO_CAL_INTERVAL); 580 581 err = readl_relaxed_poll_timeout_atomic( 582 emc->regs + EMC_AUTO_CAL_STATUS, val, 583 !(val & EMC_AUTO_CAL_STATUS_ACTIVE), 1, 300); 584 if (err) { 585 dev_err(emc->dev, 586 "auto-cal finish timeout: %d\n", err); 587 return err; 588 } 589 590 emc->vref_cal_toggle = true; 591 } 592 } 593 594 /* program shadow registers */ 595 for (i = 0; i < ARRAY_SIZE(timing->data); i++) { 596 /* EMC_XM2CLKPADCTRL should be programmed separately */ 597 if (i != 73) 598 writel_relaxed(timing->data[i], 599 emc->regs + emc_timing_registers[i]); 600 } 601 602 err = tegra_mc_write_emem_configuration(emc->mc, timing->rate); 603 if (err) 604 return err; 605 606 /* DDR3: predict MRS long wait count */ 607 if (dram_type == DRAM_TYPE_DDR3 && dll_change == DLL_CHANGE_ON) { 608 u32 cnt = 512; 609 610 if (emc->zcal_long) 611 cnt -= dram_num * 256; 612 613 val = timing->data[82] & EMC_MRS_WAIT_CNT_SHORT_WAIT_MASK; 614 if (cnt < val) 615 cnt = val; 616 617 val = timing->data[82] & ~EMC_MRS_WAIT_CNT_LONG_WAIT_MASK; 618 val |= (cnt << EMC_MRS_WAIT_CNT_LONG_WAIT_SHIFT) & 619 EMC_MRS_WAIT_CNT_LONG_WAIT_MASK; 620 621 writel_relaxed(val, emc->regs + EMC_MRS_WAIT_CNT); 622 } 623 624 /* this read also completes the writes */ 625 val = readl_relaxed(emc->regs + EMC_SEL_DPD_CTRL); 626 627 if (!(val & EMC_SEL_DPD_CTRL_QUSE_DPD_ENABLE) && schmitt_to_vref) { 628 u32 cur_mode, new_mode; 629 630 cur_mode = fbio_cfg5 & EMC_CFG5_QUSE_MODE_MASK; 631 cur_mode >>= EMC_CFG5_QUSE_MODE_SHIFT; 632 633 new_mode = timing->data[39] & EMC_CFG5_QUSE_MODE_MASK; 634 new_mode >>= EMC_CFG5_QUSE_MODE_SHIFT; 635 636 if ((cur_mode != EMC_CFG5_QUSE_MODE_PULSE_INTERN && 637 cur_mode != EMC_CFG5_QUSE_MODE_INTERNAL_LPBK) || 638 (new_mode != EMC_CFG5_QUSE_MODE_PULSE_INTERN && 639 new_mode != EMC_CFG5_QUSE_MODE_INTERNAL_LPBK)) 640 qrst_used = true; 641 } 642 643 /* flow control marker 1 */ 644 writel_relaxed(0x1, emc->regs + EMC_STALL_THEN_EXE_BEFORE_CLKCHANGE); 645 646 /* enable periodic reset */ 647 if (qrst_used) { 648 writel_relaxed(emc_dbg | EMC_DBG_WRITE_MUX_ACTIVE, 649 emc->regs + EMC_DBG); 650 writel_relaxed(emc->emc_cfg | EMC_CFG_PERIODIC_QRST, 651 emc->regs + EMC_CFG); 652 writel_relaxed(emc_dbg, emc->regs + EMC_DBG); 653 } 654 655 /* disable auto-refresh to save time after clock change */ 656 writel_relaxed(EMC_REFCTRL_DISABLE_ALL(dram_num), 657 emc->regs + EMC_REFCTRL); 658 659 /* turn off DLL and enter self-refresh on DDR3 */ 660 if (dram_type == DRAM_TYPE_DDR3) { 661 if (dll_change == DLL_CHANGE_OFF) 662 writel_relaxed(timing->emc_mode_1, 663 emc->regs + EMC_EMRS); 664 665 writel_relaxed(DRAM_BROADCAST(dram_num) | 666 EMC_SELF_REF_CMD_ENABLED, 667 emc->regs + EMC_SELF_REF); 668 } 669 670 /* flow control marker 2 */ 671 writel_relaxed(0x1, emc->regs + EMC_STALL_THEN_EXE_AFTER_CLKCHANGE); 672 673 /* enable write-active MUX, update unshadowed pad control */ 674 writel_relaxed(emc_dbg | EMC_DBG_WRITE_MUX_ACTIVE, emc->regs + EMC_DBG); 675 writel_relaxed(timing->data[73], emc->regs + EMC_XM2CLKPADCTRL); 676 677 /* restore periodic QRST and disable write-active MUX */ 678 val = !!(emc->emc_cfg & EMC_CFG_PERIODIC_QRST); 679 if (qrst_used || timing->emc_cfg_periodic_qrst != val) { 680 if (timing->emc_cfg_periodic_qrst) 681 emc->emc_cfg |= EMC_CFG_PERIODIC_QRST; 682 else 683 emc->emc_cfg &= ~EMC_CFG_PERIODIC_QRST; 684 685 writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG); 686 } 687 writel_relaxed(emc_dbg, emc->regs + EMC_DBG); 688 689 /* exit self-refresh on DDR3 */ 690 if (dram_type == DRAM_TYPE_DDR3) 691 writel_relaxed(DRAM_BROADCAST(dram_num), 692 emc->regs + EMC_SELF_REF); 693 694 /* set DRAM-mode registers */ 695 if (dram_type == DRAM_TYPE_DDR3) { 696 if (timing->emc_mode_1 != emc->emc_mode_1) 697 writel_relaxed(timing->emc_mode_1, 698 emc->regs + EMC_EMRS); 699 700 if (timing->emc_mode_2 != emc->emc_mode_2) 701 writel_relaxed(timing->emc_mode_2, 702 emc->regs + EMC_EMRS); 703 704 if (timing->emc_mode_reset != emc->emc_mode_reset || 705 dll_change == DLL_CHANGE_ON) { 706 val = timing->emc_mode_reset; 707 if (dll_change == DLL_CHANGE_ON) { 708 val |= EMC_MODE_SET_DLL_RESET; 709 val |= EMC_MODE_SET_LONG_CNT; 710 } else { 711 val &= ~EMC_MODE_SET_DLL_RESET; 712 } 713 writel_relaxed(val, emc->regs + EMC_MRS); 714 } 715 } else { 716 if (timing->emc_mode_2 != emc->emc_mode_2) 717 writel_relaxed(timing->emc_mode_2, 718 emc->regs + EMC_MRW); 719 720 if (timing->emc_mode_1 != emc->emc_mode_1) 721 writel_relaxed(timing->emc_mode_1, 722 emc->regs + EMC_MRW); 723 } 724 725 emc->emc_mode_1 = timing->emc_mode_1; 726 emc->emc_mode_2 = timing->emc_mode_2; 727 emc->emc_mode_reset = timing->emc_mode_reset; 728 729 /* issue ZCAL command if turning ZCAL on */ 730 if (emc->zcal_long) { 731 writel_relaxed(EMC_ZQ_CAL_LONG_CMD_DEV0, 732 emc->regs + EMC_ZQ_CAL); 733 734 if (dram_num > 1) 735 writel_relaxed(EMC_ZQ_CAL_LONG_CMD_DEV1, 736 emc->regs + EMC_ZQ_CAL); 737 } 738 739 /* flow control marker 3 */ 740 writel_relaxed(0x1, emc->regs + EMC_UNSTALL_RW_AFTER_CLKCHANGE); 741 742 /* 743 * Read and discard an arbitrary MC register (Note: EMC registers 744 * can't be used) to ensure the register writes are completed. 745 */ 746 mc_readl(emc->mc, MC_EMEM_ARB_OVERRIDE); 747 748 return 0; 749 } 750 751 static int emc_complete_timing_change(struct tegra_emc *emc, 752 unsigned long rate) 753 { 754 struct emc_timing *timing = emc_find_timing(emc, rate); 755 unsigned int dram_num; 756 int err; 757 u32 v; 758 759 err = readl_relaxed_poll_timeout_atomic(emc->regs + EMC_INTSTATUS, v, 760 v & EMC_CLKCHANGE_COMPLETE_INT, 761 1, 100); 762 if (err) { 763 dev_err(emc->dev, "emc-car handshake timeout: %d\n", err); 764 return err; 765 } 766 767 /* re-enable auto-refresh */ 768 dram_num = tegra_mc_get_emem_device_count(emc->mc); 769 writel_relaxed(EMC_REFCTRL_ENABLE_ALL(dram_num), 770 emc->regs + EMC_REFCTRL); 771 772 /* restore auto-calibration */ 773 if (emc->vref_cal_toggle) 774 writel_relaxed(timing->emc_auto_cal_interval, 775 emc->regs + EMC_AUTO_CAL_INTERVAL); 776 777 /* restore dynamic self-refresh */ 778 if (timing->emc_cfg_dyn_self_ref) { 779 emc->emc_cfg |= EMC_CFG_DYN_SREF_ENABLE; 780 writel_relaxed(emc->emc_cfg, emc->regs + EMC_CFG); 781 } 782 783 /* set number of clocks to wait after each ZQ command */ 784 if (emc->zcal_long) 785 writel_relaxed(timing->emc_zcal_cnt_long, 786 emc->regs + EMC_ZCAL_WAIT_CNT); 787 788 /* wait for writes to settle */ 789 udelay(2); 790 791 /* update restored timing */ 792 err = emc_seq_update_timing(emc); 793 if (!err) 794 emc->bad_state = false; 795 796 /* restore early ACK */ 797 mc_writel(emc->mc, emc->mc_override, MC_EMEM_ARB_OVERRIDE); 798 799 return err; 800 } 801 802 static int emc_unprepare_timing_change(struct tegra_emc *emc, 803 unsigned long rate) 804 { 805 if (!emc->bad_state) { 806 /* shouldn't ever happen in practice */ 807 dev_err(emc->dev, "timing configuration can't be reverted\n"); 808 emc->bad_state = true; 809 } 810 811 return 0; 812 } 813 814 static int emc_clk_change_notify(struct notifier_block *nb, 815 unsigned long msg, void *data) 816 { 817 struct tegra_emc *emc = container_of(nb, struct tegra_emc, clk_nb); 818 struct clk_notifier_data *cnd = data; 819 int err; 820 821 switch (msg) { 822 case PRE_RATE_CHANGE: 823 /* 824 * Disable interrupt since read accesses are prohibited after 825 * stalling. 826 */ 827 disable_irq(emc->irq); 828 err = emc_prepare_timing_change(emc, cnd->new_rate); 829 enable_irq(emc->irq); 830 break; 831 832 case ABORT_RATE_CHANGE: 833 err = emc_unprepare_timing_change(emc, cnd->old_rate); 834 break; 835 836 case POST_RATE_CHANGE: 837 err = emc_complete_timing_change(emc, cnd->new_rate); 838 break; 839 840 default: 841 return NOTIFY_DONE; 842 } 843 844 return notifier_from_errno(err); 845 } 846 847 static int load_one_timing_from_dt(struct tegra_emc *emc, 848 struct emc_timing *timing, 849 struct device_node *node) 850 { 851 u32 value; 852 int err; 853 854 err = of_property_read_u32(node, "clock-frequency", &value); 855 if (err) { 856 dev_err(emc->dev, "timing %pOF: failed to read rate: %d\n", 857 node, err); 858 return err; 859 } 860 861 timing->rate = value; 862 863 err = of_property_read_u32_array(node, "nvidia,emc-configuration", 864 timing->data, 865 ARRAY_SIZE(emc_timing_registers)); 866 if (err) { 867 dev_err(emc->dev, 868 "timing %pOF: failed to read emc timing data: %d\n", 869 node, err); 870 return err; 871 } 872 873 #define EMC_READ_BOOL(prop, dtprop) \ 874 timing->prop = of_property_read_bool(node, dtprop); 875 876 #define EMC_READ_U32(prop, dtprop) \ 877 err = of_property_read_u32(node, dtprop, &timing->prop); \ 878 if (err) { \ 879 dev_err(emc->dev, \ 880 "timing %pOFn: failed to read " #prop ": %d\n", \ 881 node, err); \ 882 return err; \ 883 } 884 885 EMC_READ_U32(emc_auto_cal_interval, "nvidia,emc-auto-cal-interval") 886 EMC_READ_U32(emc_mode_1, "nvidia,emc-mode-1") 887 EMC_READ_U32(emc_mode_2, "nvidia,emc-mode-2") 888 EMC_READ_U32(emc_mode_reset, "nvidia,emc-mode-reset") 889 EMC_READ_U32(emc_zcal_cnt_long, "nvidia,emc-zcal-cnt-long") 890 EMC_READ_BOOL(emc_cfg_dyn_self_ref, "nvidia,emc-cfg-dyn-self-ref") 891 EMC_READ_BOOL(emc_cfg_periodic_qrst, "nvidia,emc-cfg-periodic-qrst") 892 893 #undef EMC_READ_U32 894 #undef EMC_READ_BOOL 895 896 dev_dbg(emc->dev, "%s: %pOF: rate %lu\n", __func__, node, timing->rate); 897 898 return 0; 899 } 900 901 static int cmp_timings(const void *_a, const void *_b) 902 { 903 const struct emc_timing *a = _a; 904 const struct emc_timing *b = _b; 905 906 if (a->rate < b->rate) 907 return -1; 908 909 if (a->rate > b->rate) 910 return 1; 911 912 return 0; 913 } 914 915 static int emc_check_mc_timings(struct tegra_emc *emc) 916 { 917 struct tegra_mc *mc = emc->mc; 918 unsigned int i; 919 920 if (emc->num_timings != mc->num_timings) { 921 dev_err(emc->dev, "emc/mc timings number mismatch: %u %u\n", 922 emc->num_timings, mc->num_timings); 923 return -EINVAL; 924 } 925 926 for (i = 0; i < mc->num_timings; i++) { 927 if (emc->timings[i].rate != mc->timings[i].rate) { 928 dev_err(emc->dev, 929 "emc/mc timing rate mismatch: %lu %lu\n", 930 emc->timings[i].rate, mc->timings[i].rate); 931 return -EINVAL; 932 } 933 } 934 935 return 0; 936 } 937 938 static int emc_load_timings_from_dt(struct tegra_emc *emc, 939 struct device_node *node) 940 { 941 struct device_node *child; 942 struct emc_timing *timing; 943 int child_count; 944 int err; 945 946 child_count = of_get_child_count(node); 947 if (!child_count) { 948 dev_err(emc->dev, "no memory timings in: %pOF\n", node); 949 return -EINVAL; 950 } 951 952 emc->timings = devm_kcalloc(emc->dev, child_count, sizeof(*timing), 953 GFP_KERNEL); 954 if (!emc->timings) 955 return -ENOMEM; 956 957 emc->num_timings = child_count; 958 timing = emc->timings; 959 960 for_each_child_of_node(node, child) { 961 err = load_one_timing_from_dt(emc, timing++, child); 962 if (err) { 963 of_node_put(child); 964 return err; 965 } 966 } 967 968 sort(emc->timings, emc->num_timings, sizeof(*timing), cmp_timings, 969 NULL); 970 971 err = emc_check_mc_timings(emc); 972 if (err) 973 return err; 974 975 dev_info(emc->dev, 976 "got %u timings for RAM code %u (min %luMHz max %luMHz)\n", 977 emc->num_timings, 978 tegra_read_ram_code(), 979 emc->timings[0].rate / 1000000, 980 emc->timings[emc->num_timings - 1].rate / 1000000); 981 982 return 0; 983 } 984 985 static struct device_node *emc_find_node_by_ram_code(struct device *dev) 986 { 987 struct device_node *np; 988 u32 value, ram_code; 989 int err; 990 991 ram_code = tegra_read_ram_code(); 992 993 for_each_child_of_node(dev->of_node, np) { 994 err = of_property_read_u32(np, "nvidia,ram-code", &value); 995 if (err || value != ram_code) 996 continue; 997 998 return np; 999 } 1000 1001 dev_err(dev, "no memory timings for RAM code %u found in device-tree\n", 1002 ram_code); 1003 1004 return NULL; 1005 } 1006 1007 static int emc_setup_hw(struct tegra_emc *emc) 1008 { 1009 u32 intmask = EMC_REFRESH_OVERFLOW_INT; 1010 u32 fbio_cfg5, emc_cfg, emc_dbg; 1011 enum emc_dram_type dram_type; 1012 1013 fbio_cfg5 = readl_relaxed(emc->regs + EMC_FBIO_CFG5); 1014 dram_type = fbio_cfg5 & EMC_FBIO_CFG5_DRAM_TYPE_MASK; 1015 1016 emc_cfg = readl_relaxed(emc->regs + EMC_CFG_2); 1017 1018 /* enable EMC and CAR to handshake on PLL divider/source changes */ 1019 emc_cfg |= EMC_CLKCHANGE_REQ_ENABLE; 1020 1021 /* configure clock change mode accordingly to DRAM type */ 1022 switch (dram_type) { 1023 case DRAM_TYPE_LPDDR2: 1024 emc_cfg |= EMC_CLKCHANGE_PD_ENABLE; 1025 emc_cfg &= ~EMC_CLKCHANGE_SR_ENABLE; 1026 break; 1027 1028 default: 1029 emc_cfg &= ~EMC_CLKCHANGE_SR_ENABLE; 1030 emc_cfg &= ~EMC_CLKCHANGE_PD_ENABLE; 1031 break; 1032 } 1033 1034 writel_relaxed(emc_cfg, emc->regs + EMC_CFG_2); 1035 1036 /* initialize interrupt */ 1037 writel_relaxed(intmask, emc->regs + EMC_INTMASK); 1038 writel_relaxed(0xffffffff, emc->regs + EMC_INTSTATUS); 1039 1040 /* ensure that unwanted debug features are disabled */ 1041 emc_dbg = readl_relaxed(emc->regs + EMC_DBG); 1042 emc_dbg |= EMC_DBG_CFG_PRIORITY; 1043 emc_dbg &= ~EMC_DBG_READ_MUX_ASSEMBLY; 1044 emc_dbg &= ~EMC_DBG_WRITE_MUX_ACTIVE; 1045 emc_dbg &= ~EMC_DBG_FORCE_UPDATE; 1046 writel_relaxed(emc_dbg, emc->regs + EMC_DBG); 1047 1048 return 0; 1049 } 1050 1051 static long emc_round_rate(unsigned long rate, 1052 unsigned long min_rate, 1053 unsigned long max_rate, 1054 void *arg) 1055 { 1056 struct emc_timing *timing = NULL; 1057 struct tegra_emc *emc = arg; 1058 unsigned int i; 1059 1060 min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate); 1061 1062 for (i = 0; i < emc->num_timings; i++) { 1063 if (emc->timings[i].rate < rate && i != emc->num_timings - 1) 1064 continue; 1065 1066 if (emc->timings[i].rate > max_rate) { 1067 i = max(i, 1u) - 1; 1068 1069 if (emc->timings[i].rate < min_rate) 1070 break; 1071 } 1072 1073 if (emc->timings[i].rate < min_rate) 1074 continue; 1075 1076 timing = &emc->timings[i]; 1077 break; 1078 } 1079 1080 if (!timing) { 1081 dev_err(emc->dev, "no timing for rate %lu min %lu max %lu\n", 1082 rate, min_rate, max_rate); 1083 return -EINVAL; 1084 } 1085 1086 return timing->rate; 1087 } 1088 1089 /* 1090 * debugfs interface 1091 * 1092 * The memory controller driver exposes some files in debugfs that can be used 1093 * to control the EMC frequency. The top-level directory can be found here: 1094 * 1095 * /sys/kernel/debug/emc 1096 * 1097 * It contains the following files: 1098 * 1099 * - available_rates: This file contains a list of valid, space-separated 1100 * EMC frequencies. 1101 * 1102 * - min_rate: Writing a value to this file sets the given frequency as the 1103 * floor of the permitted range. If this is higher than the currently 1104 * configured EMC frequency, this will cause the frequency to be 1105 * increased so that it stays within the valid range. 1106 * 1107 * - max_rate: Similarily to the min_rate file, writing a value to this file 1108 * sets the given frequency as the ceiling of the permitted range. If 1109 * the value is lower than the currently configured EMC frequency, this 1110 * will cause the frequency to be decreased so that it stays within the 1111 * valid range. 1112 */ 1113 1114 static bool tegra_emc_validate_rate(struct tegra_emc *emc, unsigned long rate) 1115 { 1116 unsigned int i; 1117 1118 for (i = 0; i < emc->num_timings; i++) 1119 if (rate == emc->timings[i].rate) 1120 return true; 1121 1122 return false; 1123 } 1124 1125 static int tegra_emc_debug_available_rates_show(struct seq_file *s, void *data) 1126 { 1127 struct tegra_emc *emc = s->private; 1128 const char *prefix = ""; 1129 unsigned int i; 1130 1131 for (i = 0; i < emc->num_timings; i++) { 1132 seq_printf(s, "%s%lu", prefix, emc->timings[i].rate); 1133 prefix = " "; 1134 } 1135 1136 seq_puts(s, "\n"); 1137 1138 return 0; 1139 } 1140 1141 static int tegra_emc_debug_available_rates_open(struct inode *inode, 1142 struct file *file) 1143 { 1144 return single_open(file, tegra_emc_debug_available_rates_show, 1145 inode->i_private); 1146 } 1147 1148 static const struct file_operations tegra_emc_debug_available_rates_fops = { 1149 .open = tegra_emc_debug_available_rates_open, 1150 .read = seq_read, 1151 .llseek = seq_lseek, 1152 .release = single_release, 1153 }; 1154 1155 static int tegra_emc_debug_min_rate_get(void *data, u64 *rate) 1156 { 1157 struct tegra_emc *emc = data; 1158 1159 *rate = emc->debugfs.min_rate; 1160 1161 return 0; 1162 } 1163 1164 static int tegra_emc_debug_min_rate_set(void *data, u64 rate) 1165 { 1166 struct tegra_emc *emc = data; 1167 int err; 1168 1169 if (!tegra_emc_validate_rate(emc, rate)) 1170 return -EINVAL; 1171 1172 err = clk_set_min_rate(emc->clk, rate); 1173 if (err < 0) 1174 return err; 1175 1176 emc->debugfs.min_rate = rate; 1177 1178 return 0; 1179 } 1180 1181 DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_min_rate_fops, 1182 tegra_emc_debug_min_rate_get, 1183 tegra_emc_debug_min_rate_set, "%llu\n"); 1184 1185 static int tegra_emc_debug_max_rate_get(void *data, u64 *rate) 1186 { 1187 struct tegra_emc *emc = data; 1188 1189 *rate = emc->debugfs.max_rate; 1190 1191 return 0; 1192 } 1193 1194 static int tegra_emc_debug_max_rate_set(void *data, u64 rate) 1195 { 1196 struct tegra_emc *emc = data; 1197 int err; 1198 1199 if (!tegra_emc_validate_rate(emc, rate)) 1200 return -EINVAL; 1201 1202 err = clk_set_max_rate(emc->clk, rate); 1203 if (err < 0) 1204 return err; 1205 1206 emc->debugfs.max_rate = rate; 1207 1208 return 0; 1209 } 1210 1211 DEFINE_SIMPLE_ATTRIBUTE(tegra_emc_debug_max_rate_fops, 1212 tegra_emc_debug_max_rate_get, 1213 tegra_emc_debug_max_rate_set, "%llu\n"); 1214 1215 static void tegra_emc_debugfs_init(struct tegra_emc *emc) 1216 { 1217 struct device *dev = emc->dev; 1218 unsigned int i; 1219 int err; 1220 1221 emc->debugfs.min_rate = ULONG_MAX; 1222 emc->debugfs.max_rate = 0; 1223 1224 for (i = 0; i < emc->num_timings; i++) { 1225 if (emc->timings[i].rate < emc->debugfs.min_rate) 1226 emc->debugfs.min_rate = emc->timings[i].rate; 1227 1228 if (emc->timings[i].rate > emc->debugfs.max_rate) 1229 emc->debugfs.max_rate = emc->timings[i].rate; 1230 } 1231 1232 if (!emc->num_timings) { 1233 emc->debugfs.min_rate = clk_get_rate(emc->clk); 1234 emc->debugfs.max_rate = emc->debugfs.min_rate; 1235 } 1236 1237 err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, 1238 emc->debugfs.max_rate); 1239 if (err < 0) { 1240 dev_err(dev, "failed to set rate range [%lu-%lu] for %pC\n", 1241 emc->debugfs.min_rate, emc->debugfs.max_rate, 1242 emc->clk); 1243 } 1244 1245 emc->debugfs.root = debugfs_create_dir("emc", NULL); 1246 if (!emc->debugfs.root) { 1247 dev_err(emc->dev, "failed to create debugfs directory\n"); 1248 return; 1249 } 1250 1251 debugfs_create_file("available_rates", 0444, emc->debugfs.root, 1252 emc, &tegra_emc_debug_available_rates_fops); 1253 debugfs_create_file("min_rate", 0644, emc->debugfs.root, 1254 emc, &tegra_emc_debug_min_rate_fops); 1255 debugfs_create_file("max_rate", 0644, emc->debugfs.root, 1256 emc, &tegra_emc_debug_max_rate_fops); 1257 } 1258 1259 static int tegra_emc_probe(struct platform_device *pdev) 1260 { 1261 struct platform_device *mc; 1262 struct device_node *np; 1263 struct tegra_emc *emc; 1264 int err; 1265 1266 if (of_get_child_count(pdev->dev.of_node) == 0) { 1267 dev_info(&pdev->dev, 1268 "device-tree node doesn't have memory timings\n"); 1269 return -ENODEV; 1270 } 1271 1272 np = of_parse_phandle(pdev->dev.of_node, "nvidia,memory-controller", 0); 1273 if (!np) { 1274 dev_err(&pdev->dev, "could not get memory controller node\n"); 1275 return -ENOENT; 1276 } 1277 1278 mc = of_find_device_by_node(np); 1279 of_node_put(np); 1280 if (!mc) 1281 return -ENOENT; 1282 1283 np = emc_find_node_by_ram_code(&pdev->dev); 1284 if (!np) 1285 return -EINVAL; 1286 1287 emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL); 1288 if (!emc) { 1289 of_node_put(np); 1290 return -ENOMEM; 1291 } 1292 1293 emc->mc = platform_get_drvdata(mc); 1294 if (!emc->mc) 1295 return -EPROBE_DEFER; 1296 1297 emc->clk_nb.notifier_call = emc_clk_change_notify; 1298 emc->dev = &pdev->dev; 1299 1300 err = emc_load_timings_from_dt(emc, np); 1301 of_node_put(np); 1302 if (err) 1303 return err; 1304 1305 emc->regs = devm_platform_ioremap_resource(pdev, 0); 1306 if (IS_ERR(emc->regs)) 1307 return PTR_ERR(emc->regs); 1308 1309 err = emc_setup_hw(emc); 1310 if (err) 1311 return err; 1312 1313 err = platform_get_irq(pdev, 0); 1314 if (err < 0) { 1315 dev_err(&pdev->dev, "interrupt not specified: %d\n", err); 1316 return err; 1317 } 1318 emc->irq = err; 1319 1320 err = devm_request_irq(&pdev->dev, emc->irq, tegra_emc_isr, 0, 1321 dev_name(&pdev->dev), emc); 1322 if (err) { 1323 dev_err(&pdev->dev, "failed to request irq: %d\n", err); 1324 return err; 1325 } 1326 1327 tegra20_clk_set_emc_round_callback(emc_round_rate, emc); 1328 1329 emc->clk = devm_clk_get(&pdev->dev, "emc"); 1330 if (IS_ERR(emc->clk)) { 1331 err = PTR_ERR(emc->clk); 1332 dev_err(&pdev->dev, "failed to get emc clock: %d\n", err); 1333 goto unset_cb; 1334 } 1335 1336 err = clk_notifier_register(emc->clk, &emc->clk_nb); 1337 if (err) { 1338 dev_err(&pdev->dev, "failed to register clk notifier: %d\n", 1339 err); 1340 goto unset_cb; 1341 } 1342 1343 platform_set_drvdata(pdev, emc); 1344 tegra_emc_debugfs_init(emc); 1345 1346 return 0; 1347 1348 unset_cb: 1349 tegra20_clk_set_emc_round_callback(NULL, NULL); 1350 1351 return err; 1352 } 1353 1354 static int tegra_emc_suspend(struct device *dev) 1355 { 1356 struct tegra_emc *emc = dev_get_drvdata(dev); 1357 int err; 1358 1359 /* take exclusive control over the clock's rate */ 1360 err = clk_rate_exclusive_get(emc->clk); 1361 if (err) { 1362 dev_err(emc->dev, "failed to acquire clk: %d\n", err); 1363 return err; 1364 } 1365 1366 /* suspending in a bad state will hang machine */ 1367 if (WARN(emc->bad_state, "hardware in a bad state\n")) 1368 return -EINVAL; 1369 1370 emc->bad_state = true; 1371 1372 return 0; 1373 } 1374 1375 static int tegra_emc_resume(struct device *dev) 1376 { 1377 struct tegra_emc *emc = dev_get_drvdata(dev); 1378 1379 emc_setup_hw(emc); 1380 emc->bad_state = false; 1381 1382 clk_rate_exclusive_put(emc->clk); 1383 1384 return 0; 1385 } 1386 1387 static const struct dev_pm_ops tegra_emc_pm_ops = { 1388 .suspend = tegra_emc_suspend, 1389 .resume = tegra_emc_resume, 1390 }; 1391 1392 static const struct of_device_id tegra_emc_of_match[] = { 1393 { .compatible = "nvidia,tegra30-emc", }, 1394 {}, 1395 }; 1396 1397 static struct platform_driver tegra_emc_driver = { 1398 .probe = tegra_emc_probe, 1399 .driver = { 1400 .name = "tegra30-emc", 1401 .of_match_table = tegra_emc_of_match, 1402 .pm = &tegra_emc_pm_ops, 1403 .suppress_bind_attrs = true, 1404 }, 1405 }; 1406 1407 static int __init tegra_emc_init(void) 1408 { 1409 return platform_driver_register(&tegra_emc_driver); 1410 } 1411 subsys_initcall(tegra_emc_init); 1412