1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Exynos Specific Extensions for Synopsys DW Multimedia Card Interface driver 4 * 5 * Copyright (C) 2012, Samsung Electronics Co., Ltd. 6 */ 7 8 #include <linux/module.h> 9 #include <linux/platform_device.h> 10 #include <linux/clk.h> 11 #include <linux/mmc/host.h> 12 #include <linux/mmc/mmc.h> 13 #include <linux/of.h> 14 #include <linux/of_gpio.h> 15 #include <linux/pm_runtime.h> 16 #include <linux/slab.h> 17 18 #include "dw_mmc.h" 19 #include "dw_mmc-pltfm.h" 20 #include "dw_mmc-exynos.h" 21 22 /* Variations in Exynos specific dw-mshc controller */ 23 enum dw_mci_exynos_type { 24 DW_MCI_TYPE_EXYNOS4210, 25 DW_MCI_TYPE_EXYNOS4412, 26 DW_MCI_TYPE_EXYNOS5250, 27 DW_MCI_TYPE_EXYNOS5420, 28 DW_MCI_TYPE_EXYNOS5420_SMU, 29 DW_MCI_TYPE_EXYNOS7, 30 DW_MCI_TYPE_EXYNOS7_SMU, 31 }; 32 33 /* Exynos implementation specific driver private data */ 34 struct dw_mci_exynos_priv_data { 35 enum dw_mci_exynos_type ctrl_type; 36 u8 ciu_div; 37 u32 sdr_timing; 38 u32 ddr_timing; 39 u32 hs400_timing; 40 u32 tuned_sample; 41 u32 cur_speed; 42 u32 dqs_delay; 43 u32 saved_dqs_en; 44 u32 saved_strobe_ctrl; 45 }; 46 47 static struct dw_mci_exynos_compatible { 48 char *compatible; 49 enum dw_mci_exynos_type ctrl_type; 50 } exynos_compat[] = { 51 { 52 .compatible = "samsung,exynos4210-dw-mshc", 53 .ctrl_type = DW_MCI_TYPE_EXYNOS4210, 54 }, { 55 .compatible = "samsung,exynos4412-dw-mshc", 56 .ctrl_type = DW_MCI_TYPE_EXYNOS4412, 57 }, { 58 .compatible = "samsung,exynos5250-dw-mshc", 59 .ctrl_type = DW_MCI_TYPE_EXYNOS5250, 60 }, { 61 .compatible = "samsung,exynos5420-dw-mshc", 62 .ctrl_type = DW_MCI_TYPE_EXYNOS5420, 63 }, { 64 .compatible = "samsung,exynos5420-dw-mshc-smu", 65 .ctrl_type = DW_MCI_TYPE_EXYNOS5420_SMU, 66 }, { 67 .compatible = "samsung,exynos7-dw-mshc", 68 .ctrl_type = DW_MCI_TYPE_EXYNOS7, 69 }, { 70 .compatible = "samsung,exynos7-dw-mshc-smu", 71 .ctrl_type = DW_MCI_TYPE_EXYNOS7_SMU, 72 }, 73 }; 74 75 static inline u8 dw_mci_exynos_get_ciu_div(struct dw_mci *host) 76 { 77 struct dw_mci_exynos_priv_data *priv = host->priv; 78 79 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412) 80 return EXYNOS4412_FIXED_CIU_CLK_DIV; 81 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) 82 return EXYNOS4210_FIXED_CIU_CLK_DIV; 83 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 84 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 85 return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL64)) + 1; 86 else 87 return SDMMC_CLKSEL_GET_DIV(mci_readl(host, CLKSEL)) + 1; 88 } 89 90 static void dw_mci_exynos_config_smu(struct dw_mci *host) 91 { 92 struct dw_mci_exynos_priv_data *priv = host->priv; 93 94 /* 95 * If Exynos is provided the Security management, 96 * set for non-ecryption mode at this time. 97 */ 98 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS5420_SMU || 99 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) { 100 mci_writel(host, MPSBEGIN0, 0); 101 mci_writel(host, MPSEND0, SDMMC_ENDING_SEC_NR_MAX); 102 mci_writel(host, MPSCTRL0, SDMMC_MPSCTRL_SECURE_WRITE_BIT | 103 SDMMC_MPSCTRL_NON_SECURE_READ_BIT | 104 SDMMC_MPSCTRL_VALID | 105 SDMMC_MPSCTRL_NON_SECURE_WRITE_BIT); 106 } 107 } 108 109 static int dw_mci_exynos_priv_init(struct dw_mci *host) 110 { 111 struct dw_mci_exynos_priv_data *priv = host->priv; 112 113 dw_mci_exynos_config_smu(host); 114 115 if (priv->ctrl_type >= DW_MCI_TYPE_EXYNOS5420) { 116 priv->saved_strobe_ctrl = mci_readl(host, HS400_DLINE_CTRL); 117 priv->saved_dqs_en = mci_readl(host, HS400_DQS_EN); 118 priv->saved_dqs_en |= AXI_NON_BLOCKING_WR; 119 mci_writel(host, HS400_DQS_EN, priv->saved_dqs_en); 120 if (!priv->dqs_delay) 121 priv->dqs_delay = 122 DQS_CTRL_GET_RD_DELAY(priv->saved_strobe_ctrl); 123 } 124 125 host->bus_hz /= (priv->ciu_div + 1); 126 127 return 0; 128 } 129 130 static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing) 131 { 132 struct dw_mci_exynos_priv_data *priv = host->priv; 133 u32 clksel; 134 135 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 136 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 137 clksel = mci_readl(host, CLKSEL64); 138 else 139 clksel = mci_readl(host, CLKSEL); 140 141 clksel = (clksel & ~SDMMC_CLKSEL_TIMING_MASK) | timing; 142 143 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 144 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 145 mci_writel(host, CLKSEL64, clksel); 146 else 147 mci_writel(host, CLKSEL, clksel); 148 149 /* 150 * Exynos4412 and Exynos5250 extends the use of CMD register with the 151 * use of bit 29 (which is reserved on standard MSHC controllers) for 152 * optionally bypassing the HOLD register for command and data. The 153 * HOLD register should be bypassed in case there is no phase shift 154 * applied on CMD/DATA that is sent to the card. 155 */ 156 if (!SDMMC_CLKSEL_GET_DRV_WD3(clksel) && host->slot) 157 set_bit(DW_MMC_CARD_NO_USE_HOLD, &host->slot->flags); 158 } 159 160 #ifdef CONFIG_PM 161 static int dw_mci_exynos_runtime_resume(struct device *dev) 162 { 163 struct dw_mci *host = dev_get_drvdata(dev); 164 int ret; 165 166 ret = dw_mci_runtime_resume(dev); 167 if (ret) 168 return ret; 169 170 dw_mci_exynos_config_smu(host); 171 172 return ret; 173 } 174 #endif /* CONFIG_PM */ 175 176 #ifdef CONFIG_PM_SLEEP 177 /** 178 * dw_mci_exynos_suspend_noirq - Exynos-specific suspend code 179 * @dev: Device to suspend (this device) 180 * 181 * This ensures that device will be in runtime active state in 182 * dw_mci_exynos_resume_noirq after calling pm_runtime_force_resume() 183 */ 184 static int dw_mci_exynos_suspend_noirq(struct device *dev) 185 { 186 pm_runtime_get_noresume(dev); 187 return pm_runtime_force_suspend(dev); 188 } 189 190 /** 191 * dw_mci_exynos_resume_noirq - Exynos-specific resume code 192 * @dev: Device to resume (this device) 193 * 194 * On exynos5420 there is a silicon errata that will sometimes leave the 195 * WAKEUP_INT bit in the CLKSEL register asserted. This bit is 1 to indicate 196 * that it fired and we can clear it by writing a 1 back. Clear it to prevent 197 * interrupts from going off constantly. 198 * 199 * We run this code on all exynos variants because it doesn't hurt. 200 */ 201 static int dw_mci_exynos_resume_noirq(struct device *dev) 202 { 203 struct dw_mci *host = dev_get_drvdata(dev); 204 struct dw_mci_exynos_priv_data *priv = host->priv; 205 u32 clksel; 206 int ret; 207 208 ret = pm_runtime_force_resume(dev); 209 if (ret) 210 return ret; 211 212 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 213 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 214 clksel = mci_readl(host, CLKSEL64); 215 else 216 clksel = mci_readl(host, CLKSEL); 217 218 if (clksel & SDMMC_CLKSEL_WAKEUP_INT) { 219 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 220 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 221 mci_writel(host, CLKSEL64, clksel); 222 else 223 mci_writel(host, CLKSEL, clksel); 224 } 225 226 pm_runtime_put(dev); 227 228 return 0; 229 } 230 #endif /* CONFIG_PM_SLEEP */ 231 232 static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing) 233 { 234 struct dw_mci_exynos_priv_data *priv = host->priv; 235 u32 dqs, strobe; 236 237 /* 238 * Not supported to configure register 239 * related to HS400 240 */ 241 if (priv->ctrl_type < DW_MCI_TYPE_EXYNOS5420) { 242 if (timing == MMC_TIMING_MMC_HS400) 243 dev_warn(host->dev, 244 "cannot configure HS400, unsupported chipset\n"); 245 return; 246 } 247 248 dqs = priv->saved_dqs_en; 249 strobe = priv->saved_strobe_ctrl; 250 251 if (timing == MMC_TIMING_MMC_HS400) { 252 dqs |= DATA_STROBE_EN; 253 strobe = DQS_CTRL_RD_DELAY(strobe, priv->dqs_delay); 254 } else if (timing == MMC_TIMING_UHS_SDR104) { 255 dqs &= 0xffffff00; 256 } else { 257 dqs &= ~DATA_STROBE_EN; 258 } 259 260 mci_writel(host, HS400_DQS_EN, dqs); 261 mci_writel(host, HS400_DLINE_CTRL, strobe); 262 } 263 264 static void dw_mci_exynos_adjust_clock(struct dw_mci *host, unsigned int wanted) 265 { 266 struct dw_mci_exynos_priv_data *priv = host->priv; 267 unsigned long actual; 268 u8 div; 269 int ret; 270 /* 271 * Don't care if wanted clock is zero or 272 * ciu clock is unavailable 273 */ 274 if (!wanted || IS_ERR(host->ciu_clk)) 275 return; 276 277 /* Guaranteed minimum frequency for cclkin */ 278 if (wanted < EXYNOS_CCLKIN_MIN) 279 wanted = EXYNOS_CCLKIN_MIN; 280 281 if (wanted == priv->cur_speed) 282 return; 283 284 div = dw_mci_exynos_get_ciu_div(host); 285 ret = clk_set_rate(host->ciu_clk, wanted * div); 286 if (ret) 287 dev_warn(host->dev, 288 "failed to set clk-rate %u error: %d\n", 289 wanted * div, ret); 290 actual = clk_get_rate(host->ciu_clk); 291 host->bus_hz = actual / div; 292 priv->cur_speed = wanted; 293 host->current_speed = 0; 294 } 295 296 static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios) 297 { 298 struct dw_mci_exynos_priv_data *priv = host->priv; 299 unsigned int wanted = ios->clock; 300 u32 timing = ios->timing, clksel; 301 302 switch (timing) { 303 case MMC_TIMING_MMC_HS400: 304 /* Update tuned sample timing */ 305 clksel = SDMMC_CLKSEL_UP_SAMPLE( 306 priv->hs400_timing, priv->tuned_sample); 307 wanted <<= 1; 308 break; 309 case MMC_TIMING_MMC_DDR52: 310 clksel = priv->ddr_timing; 311 /* Should be double rate for DDR mode */ 312 if (ios->bus_width == MMC_BUS_WIDTH_8) 313 wanted <<= 1; 314 break; 315 case MMC_TIMING_UHS_SDR104: 316 case MMC_TIMING_UHS_SDR50: 317 clksel = (priv->sdr_timing & 0xfff8ffff) | 318 (priv->ciu_div << 16); 319 break; 320 case MMC_TIMING_UHS_DDR50: 321 clksel = (priv->ddr_timing & 0xfff8ffff) | 322 (priv->ciu_div << 16); 323 break; 324 default: 325 clksel = priv->sdr_timing; 326 } 327 328 /* Set clock timing for the requested speed mode*/ 329 dw_mci_exynos_set_clksel_timing(host, clksel); 330 331 /* Configure setting for HS400 */ 332 dw_mci_exynos_config_hs400(host, timing); 333 334 /* Configure clock rate */ 335 dw_mci_exynos_adjust_clock(host, wanted); 336 } 337 338 static int dw_mci_exynos_parse_dt(struct dw_mci *host) 339 { 340 struct dw_mci_exynos_priv_data *priv; 341 struct device_node *np = host->dev->of_node; 342 u32 timing[2]; 343 u32 div = 0; 344 int idx; 345 int ret; 346 347 priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL); 348 if (!priv) 349 return -ENOMEM; 350 351 for (idx = 0; idx < ARRAY_SIZE(exynos_compat); idx++) { 352 if (of_device_is_compatible(np, exynos_compat[idx].compatible)) 353 priv->ctrl_type = exynos_compat[idx].ctrl_type; 354 } 355 356 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4412) 357 priv->ciu_div = EXYNOS4412_FIXED_CIU_CLK_DIV - 1; 358 else if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS4210) 359 priv->ciu_div = EXYNOS4210_FIXED_CIU_CLK_DIV - 1; 360 else { 361 of_property_read_u32(np, "samsung,dw-mshc-ciu-div", &div); 362 priv->ciu_div = div; 363 } 364 365 ret = of_property_read_u32_array(np, 366 "samsung,dw-mshc-sdr-timing", timing, 2); 367 if (ret) 368 return ret; 369 370 priv->sdr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div); 371 372 ret = of_property_read_u32_array(np, 373 "samsung,dw-mshc-ddr-timing", timing, 2); 374 if (ret) 375 return ret; 376 377 priv->ddr_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], div); 378 379 ret = of_property_read_u32_array(np, 380 "samsung,dw-mshc-hs400-timing", timing, 2); 381 if (!ret && of_property_read_u32(np, 382 "samsung,read-strobe-delay", &priv->dqs_delay)) 383 dev_dbg(host->dev, 384 "read-strobe-delay is not found, assuming usage of default value\n"); 385 386 priv->hs400_timing = SDMMC_CLKSEL_TIMING(timing[0], timing[1], 387 HS400_FIXED_CIU_CLK_DIV); 388 host->priv = priv; 389 return 0; 390 } 391 392 static inline u8 dw_mci_exynos_get_clksmpl(struct dw_mci *host) 393 { 394 struct dw_mci_exynos_priv_data *priv = host->priv; 395 396 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 397 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 398 return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL64)); 399 else 400 return SDMMC_CLKSEL_CCLK_SAMPLE(mci_readl(host, CLKSEL)); 401 } 402 403 static inline void dw_mci_exynos_set_clksmpl(struct dw_mci *host, u8 sample) 404 { 405 u32 clksel; 406 struct dw_mci_exynos_priv_data *priv = host->priv; 407 408 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 409 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 410 clksel = mci_readl(host, CLKSEL64); 411 else 412 clksel = mci_readl(host, CLKSEL); 413 clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); 414 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 415 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 416 mci_writel(host, CLKSEL64, clksel); 417 else 418 mci_writel(host, CLKSEL, clksel); 419 } 420 421 static inline u8 dw_mci_exynos_move_next_clksmpl(struct dw_mci *host) 422 { 423 struct dw_mci_exynos_priv_data *priv = host->priv; 424 u32 clksel; 425 u8 sample; 426 427 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 428 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 429 clksel = mci_readl(host, CLKSEL64); 430 else 431 clksel = mci_readl(host, CLKSEL); 432 433 sample = (clksel + 1) & 0x7; 434 clksel = SDMMC_CLKSEL_UP_SAMPLE(clksel, sample); 435 436 if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 || 437 priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) 438 mci_writel(host, CLKSEL64, clksel); 439 else 440 mci_writel(host, CLKSEL, clksel); 441 442 return sample; 443 } 444 445 static s8 dw_mci_exynos_get_best_clksmpl(u8 candiates) 446 { 447 const u8 iter = 8; 448 u8 __c; 449 s8 i, loc = -1; 450 451 for (i = 0; i < iter; i++) { 452 __c = ror8(candiates, i); 453 if ((__c & 0xc7) == 0xc7) { 454 loc = i; 455 goto out; 456 } 457 } 458 459 for (i = 0; i < iter; i++) { 460 __c = ror8(candiates, i); 461 if ((__c & 0x83) == 0x83) { 462 loc = i; 463 goto out; 464 } 465 } 466 467 out: 468 return loc; 469 } 470 471 static int dw_mci_exynos_execute_tuning(struct dw_mci_slot *slot, u32 opcode) 472 { 473 struct dw_mci *host = slot->host; 474 struct dw_mci_exynos_priv_data *priv = host->priv; 475 struct mmc_host *mmc = slot->mmc; 476 u8 start_smpl, smpl, candiates = 0; 477 s8 found; 478 int ret = 0; 479 480 start_smpl = dw_mci_exynos_get_clksmpl(host); 481 482 do { 483 mci_writel(host, TMOUT, ~0); 484 smpl = dw_mci_exynos_move_next_clksmpl(host); 485 486 if (!mmc_send_tuning(mmc, opcode, NULL)) 487 candiates |= (1 << smpl); 488 489 } while (start_smpl != smpl); 490 491 found = dw_mci_exynos_get_best_clksmpl(candiates); 492 if (found >= 0) { 493 dw_mci_exynos_set_clksmpl(host, found); 494 priv->tuned_sample = found; 495 } else { 496 ret = -EIO; 497 } 498 499 return ret; 500 } 501 502 static int dw_mci_exynos_prepare_hs400_tuning(struct dw_mci *host, 503 struct mmc_ios *ios) 504 { 505 struct dw_mci_exynos_priv_data *priv = host->priv; 506 507 dw_mci_exynos_set_clksel_timing(host, priv->hs400_timing); 508 dw_mci_exynos_adjust_clock(host, (ios->clock) << 1); 509 510 return 0; 511 } 512 513 /* Common capabilities of Exynos4/Exynos5 SoC */ 514 static unsigned long exynos_dwmmc_caps[4] = { 515 MMC_CAP_1_8V_DDR | MMC_CAP_8_BIT_DATA | MMC_CAP_CMD23, 516 MMC_CAP_CMD23, 517 MMC_CAP_CMD23, 518 MMC_CAP_CMD23, 519 }; 520 521 static const struct dw_mci_drv_data exynos_drv_data = { 522 .caps = exynos_dwmmc_caps, 523 .num_caps = ARRAY_SIZE(exynos_dwmmc_caps), 524 .init = dw_mci_exynos_priv_init, 525 .set_ios = dw_mci_exynos_set_ios, 526 .parse_dt = dw_mci_exynos_parse_dt, 527 .execute_tuning = dw_mci_exynos_execute_tuning, 528 .prepare_hs400_tuning = dw_mci_exynos_prepare_hs400_tuning, 529 }; 530 531 static const struct of_device_id dw_mci_exynos_match[] = { 532 { .compatible = "samsung,exynos4412-dw-mshc", 533 .data = &exynos_drv_data, }, 534 { .compatible = "samsung,exynos5250-dw-mshc", 535 .data = &exynos_drv_data, }, 536 { .compatible = "samsung,exynos5420-dw-mshc", 537 .data = &exynos_drv_data, }, 538 { .compatible = "samsung,exynos5420-dw-mshc-smu", 539 .data = &exynos_drv_data, }, 540 { .compatible = "samsung,exynos7-dw-mshc", 541 .data = &exynos_drv_data, }, 542 { .compatible = "samsung,exynos7-dw-mshc-smu", 543 .data = &exynos_drv_data, }, 544 {}, 545 }; 546 MODULE_DEVICE_TABLE(of, dw_mci_exynos_match); 547 548 static int dw_mci_exynos_probe(struct platform_device *pdev) 549 { 550 const struct dw_mci_drv_data *drv_data; 551 const struct of_device_id *match; 552 int ret; 553 554 match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node); 555 drv_data = match->data; 556 557 pm_runtime_get_noresume(&pdev->dev); 558 pm_runtime_set_active(&pdev->dev); 559 pm_runtime_enable(&pdev->dev); 560 561 ret = dw_mci_pltfm_register(pdev, drv_data); 562 if (ret) { 563 pm_runtime_disable(&pdev->dev); 564 pm_runtime_set_suspended(&pdev->dev); 565 pm_runtime_put_noidle(&pdev->dev); 566 567 return ret; 568 } 569 570 return 0; 571 } 572 573 static int dw_mci_exynos_remove(struct platform_device *pdev) 574 { 575 pm_runtime_disable(&pdev->dev); 576 pm_runtime_set_suspended(&pdev->dev); 577 pm_runtime_put_noidle(&pdev->dev); 578 579 return dw_mci_pltfm_remove(pdev); 580 } 581 582 static const struct dev_pm_ops dw_mci_exynos_pmops = { 583 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dw_mci_exynos_suspend_noirq, 584 dw_mci_exynos_resume_noirq) 585 SET_RUNTIME_PM_OPS(dw_mci_runtime_suspend, 586 dw_mci_exynos_runtime_resume, 587 NULL) 588 }; 589 590 static struct platform_driver dw_mci_exynos_pltfm_driver = { 591 .probe = dw_mci_exynos_probe, 592 .remove = dw_mci_exynos_remove, 593 .driver = { 594 .name = "dwmmc_exynos", 595 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 596 .of_match_table = dw_mci_exynos_match, 597 .pm = &dw_mci_exynos_pmops, 598 }, 599 }; 600 601 module_platform_driver(dw_mci_exynos_pltfm_driver); 602 603 MODULE_DESCRIPTION("Samsung Specific DW-MSHC Driver Extension"); 604 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com"); 605 MODULE_LICENSE("GPL v2"); 606 MODULE_ALIAS("platform:dwmmc_exynos"); 607