1 // SPDX-License-Identifier: GPL-2.0-only 2 /* drivers/rtc/rtc-s3c.c 3 * 4 * Copyright (c) 2010 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com/ 6 * 7 * Copyright (c) 2004,2006 Simtec Electronics 8 * Ben Dooks, <ben@simtec.co.uk> 9 * http://armlinux.simtec.co.uk/ 10 * 11 * S3C2410/S3C2440/S3C24XX Internal RTC Driver 12 */ 13 14 #include <linux/module.h> 15 #include <linux/fs.h> 16 #include <linux/string.h> 17 #include <linux/init.h> 18 #include <linux/platform_device.h> 19 #include <linux/interrupt.h> 20 #include <linux/rtc.h> 21 #include <linux/bcd.h> 22 #include <linux/clk.h> 23 #include <linux/log2.h> 24 #include <linux/slab.h> 25 #include <linux/of.h> 26 #include <linux/of_device.h> 27 #include <linux/uaccess.h> 28 #include <linux/io.h> 29 30 #include <asm/irq.h> 31 #include "rtc-s3c.h" 32 33 struct s3c_rtc { 34 struct device *dev; 35 struct rtc_device *rtc; 36 37 void __iomem *base; 38 struct clk *rtc_clk; 39 struct clk *rtc_src_clk; 40 bool alarm_enabled; 41 42 const struct s3c_rtc_data *data; 43 44 int irq_alarm; 45 int irq_tick; 46 47 spinlock_t pie_lock; 48 spinlock_t alarm_lock; 49 50 int ticnt_save; 51 int ticnt_en_save; 52 bool wake_en; 53 }; 54 55 struct s3c_rtc_data { 56 int max_user_freq; 57 bool needs_src_clk; 58 59 void (*irq_handler) (struct s3c_rtc *info, int mask); 60 void (*set_freq) (struct s3c_rtc *info, int freq); 61 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq); 62 void (*select_tick_clk) (struct s3c_rtc *info); 63 void (*save_tick_cnt) (struct s3c_rtc *info); 64 void (*restore_tick_cnt) (struct s3c_rtc *info); 65 void (*enable) (struct s3c_rtc *info); 66 void (*disable) (struct s3c_rtc *info); 67 }; 68 69 static int s3c_rtc_enable_clk(struct s3c_rtc *info) 70 { 71 int ret; 72 73 ret = clk_enable(info->rtc_clk); 74 if (ret) 75 return ret; 76 77 if (info->data->needs_src_clk) { 78 ret = clk_enable(info->rtc_src_clk); 79 if (ret) { 80 clk_disable(info->rtc_clk); 81 return ret; 82 } 83 } 84 return 0; 85 } 86 87 static void s3c_rtc_disable_clk(struct s3c_rtc *info) 88 { 89 if (info->data->needs_src_clk) 90 clk_disable(info->rtc_src_clk); 91 clk_disable(info->rtc_clk); 92 } 93 94 /* IRQ Handlers */ 95 static irqreturn_t s3c_rtc_tickirq(int irq, void *id) 96 { 97 struct s3c_rtc *info = (struct s3c_rtc *)id; 98 99 if (info->data->irq_handler) 100 info->data->irq_handler(info, S3C2410_INTP_TIC); 101 102 return IRQ_HANDLED; 103 } 104 105 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id) 106 { 107 struct s3c_rtc *info = (struct s3c_rtc *)id; 108 109 if (info->data->irq_handler) 110 info->data->irq_handler(info, S3C2410_INTP_ALM); 111 112 return IRQ_HANDLED; 113 } 114 115 /* Update control registers */ 116 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled) 117 { 118 struct s3c_rtc *info = dev_get_drvdata(dev); 119 unsigned long flags; 120 unsigned int tmp; 121 int ret; 122 123 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled); 124 125 ret = s3c_rtc_enable_clk(info); 126 if (ret) 127 return ret; 128 129 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN; 130 131 if (enabled) 132 tmp |= S3C2410_RTCALM_ALMEN; 133 134 writeb(tmp, info->base + S3C2410_RTCALM); 135 136 spin_lock_irqsave(&info->alarm_lock, flags); 137 138 if (info->alarm_enabled && !enabled) 139 s3c_rtc_disable_clk(info); 140 else if (!info->alarm_enabled && enabled) 141 ret = s3c_rtc_enable_clk(info); 142 143 info->alarm_enabled = enabled; 144 spin_unlock_irqrestore(&info->alarm_lock, flags); 145 146 s3c_rtc_disable_clk(info); 147 148 return ret; 149 } 150 151 /* Set RTC frequency */ 152 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq) 153 { 154 int ret; 155 156 if (!is_power_of_2(freq)) 157 return -EINVAL; 158 159 ret = s3c_rtc_enable_clk(info); 160 if (ret) 161 return ret; 162 spin_lock_irq(&info->pie_lock); 163 164 if (info->data->set_freq) 165 info->data->set_freq(info, freq); 166 167 spin_unlock_irq(&info->pie_lock); 168 s3c_rtc_disable_clk(info); 169 170 return 0; 171 } 172 173 /* Time read/write */ 174 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) 175 { 176 struct s3c_rtc *info = dev_get_drvdata(dev); 177 unsigned int have_retried = 0; 178 int ret; 179 180 ret = s3c_rtc_enable_clk(info); 181 if (ret) 182 return ret; 183 184 retry_get_time: 185 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN); 186 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR); 187 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE); 188 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON); 189 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR); 190 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC); 191 192 /* the only way to work out whether the system was mid-update 193 * when we read it is to check the second counter, and if it 194 * is zero, then we re-try the entire read 195 */ 196 197 if (rtc_tm->tm_sec == 0 && !have_retried) { 198 have_retried = 1; 199 goto retry_get_time; 200 } 201 202 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); 203 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); 204 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); 205 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); 206 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); 207 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); 208 209 s3c_rtc_disable_clk(info); 210 211 rtc_tm->tm_year += 100; 212 rtc_tm->tm_mon -= 1; 213 214 dev_dbg(dev, "read time %ptR\n", rtc_tm); 215 return 0; 216 } 217 218 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) 219 { 220 struct s3c_rtc *info = dev_get_drvdata(dev); 221 int year = tm->tm_year - 100; 222 int ret; 223 224 dev_dbg(dev, "set time %ptR\n", tm); 225 226 /* we get around y2k by simply not supporting it */ 227 228 if (year < 0 || year >= 100) { 229 dev_err(dev, "rtc only supports 100 years\n"); 230 return -EINVAL; 231 } 232 233 ret = s3c_rtc_enable_clk(info); 234 if (ret) 235 return ret; 236 237 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC); 238 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN); 239 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR); 240 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE); 241 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON); 242 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR); 243 244 s3c_rtc_disable_clk(info); 245 246 return 0; 247 } 248 249 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) 250 { 251 struct s3c_rtc *info = dev_get_drvdata(dev); 252 struct rtc_time *alm_tm = &alrm->time; 253 unsigned int alm_en; 254 int ret; 255 256 ret = s3c_rtc_enable_clk(info); 257 if (ret) 258 return ret; 259 260 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC); 261 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN); 262 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR); 263 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON); 264 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE); 265 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR); 266 267 alm_en = readb(info->base + S3C2410_RTCALM); 268 269 s3c_rtc_disable_clk(info); 270 271 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0; 272 273 dev_dbg(dev, "read alarm %d, %ptR\n", alm_en, alm_tm); 274 275 /* decode the alarm enable field */ 276 if (alm_en & S3C2410_RTCALM_SECEN) 277 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); 278 279 if (alm_en & S3C2410_RTCALM_MINEN) 280 alm_tm->tm_min = bcd2bin(alm_tm->tm_min); 281 282 if (alm_en & S3C2410_RTCALM_HOUREN) 283 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); 284 285 if (alm_en & S3C2410_RTCALM_DAYEN) 286 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday); 287 288 if (alm_en & S3C2410_RTCALM_MONEN) { 289 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon); 290 alm_tm->tm_mon -= 1; 291 } 292 293 if (alm_en & S3C2410_RTCALM_YEAREN) 294 alm_tm->tm_year = bcd2bin(alm_tm->tm_year); 295 296 return 0; 297 } 298 299 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) 300 { 301 struct s3c_rtc *info = dev_get_drvdata(dev); 302 struct rtc_time *tm = &alrm->time; 303 unsigned int alrm_en; 304 int ret; 305 306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %ptR\n", alrm->enabled, tm); 307 308 ret = s3c_rtc_enable_clk(info); 309 if (ret) 310 return ret; 311 312 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; 313 writeb(0x00, info->base + S3C2410_RTCALM); 314 315 if (tm->tm_sec < 60 && tm->tm_sec >= 0) { 316 alrm_en |= S3C2410_RTCALM_SECEN; 317 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC); 318 } 319 320 if (tm->tm_min < 60 && tm->tm_min >= 0) { 321 alrm_en |= S3C2410_RTCALM_MINEN; 322 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN); 323 } 324 325 if (tm->tm_hour < 24 && tm->tm_hour >= 0) { 326 alrm_en |= S3C2410_RTCALM_HOUREN; 327 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR); 328 } 329 330 if (tm->tm_mon < 12 && tm->tm_mon >= 0) { 331 alrm_en |= S3C2410_RTCALM_MONEN; 332 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON); 333 } 334 335 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) { 336 alrm_en |= S3C2410_RTCALM_DAYEN; 337 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE); 338 } 339 340 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en); 341 342 writeb(alrm_en, info->base + S3C2410_RTCALM); 343 344 s3c_rtc_setaie(dev, alrm->enabled); 345 346 s3c_rtc_disable_clk(info); 347 348 return 0; 349 } 350 351 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) 352 { 353 struct s3c_rtc *info = dev_get_drvdata(dev); 354 int ret; 355 356 ret = s3c_rtc_enable_clk(info); 357 if (ret) 358 return ret; 359 360 if (info->data->enable_tick) 361 info->data->enable_tick(info, seq); 362 363 s3c_rtc_disable_clk(info); 364 365 return 0; 366 } 367 368 static const struct rtc_class_ops s3c_rtcops = { 369 .read_time = s3c_rtc_gettime, 370 .set_time = s3c_rtc_settime, 371 .read_alarm = s3c_rtc_getalarm, 372 .set_alarm = s3c_rtc_setalarm, 373 .proc = s3c_rtc_proc, 374 .alarm_irq_enable = s3c_rtc_setaie, 375 }; 376 377 static void s3c24xx_rtc_enable(struct s3c_rtc *info) 378 { 379 unsigned int con, tmp; 380 381 con = readw(info->base + S3C2410_RTCCON); 382 /* re-enable the device, and check it is ok */ 383 if ((con & S3C2410_RTCCON_RTCEN) == 0) { 384 dev_info(info->dev, "rtc disabled, re-enabling\n"); 385 386 tmp = readw(info->base + S3C2410_RTCCON); 387 writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON); 388 } 389 390 if (con & S3C2410_RTCCON_CNTSEL) { 391 dev_info(info->dev, "removing RTCCON_CNTSEL\n"); 392 393 tmp = readw(info->base + S3C2410_RTCCON); 394 writew(tmp & ~S3C2410_RTCCON_CNTSEL, 395 info->base + S3C2410_RTCCON); 396 } 397 398 if (con & S3C2410_RTCCON_CLKRST) { 399 dev_info(info->dev, "removing RTCCON_CLKRST\n"); 400 401 tmp = readw(info->base + S3C2410_RTCCON); 402 writew(tmp & ~S3C2410_RTCCON_CLKRST, 403 info->base + S3C2410_RTCCON); 404 } 405 } 406 407 static void s3c24xx_rtc_disable(struct s3c_rtc *info) 408 { 409 unsigned int con; 410 411 con = readw(info->base + S3C2410_RTCCON); 412 con &= ~S3C2410_RTCCON_RTCEN; 413 writew(con, info->base + S3C2410_RTCCON); 414 415 con = readb(info->base + S3C2410_TICNT); 416 con &= ~S3C2410_TICNT_ENABLE; 417 writeb(con, info->base + S3C2410_TICNT); 418 } 419 420 static void s3c6410_rtc_disable(struct s3c_rtc *info) 421 { 422 unsigned int con; 423 424 con = readw(info->base + S3C2410_RTCCON); 425 con &= ~S3C64XX_RTCCON_TICEN; 426 con &= ~S3C2410_RTCCON_RTCEN; 427 writew(con, info->base + S3C2410_RTCCON); 428 } 429 430 static int s3c_rtc_remove(struct platform_device *pdev) 431 { 432 struct s3c_rtc *info = platform_get_drvdata(pdev); 433 434 s3c_rtc_setaie(info->dev, 0); 435 436 if (info->data->needs_src_clk) 437 clk_unprepare(info->rtc_src_clk); 438 clk_unprepare(info->rtc_clk); 439 440 return 0; 441 } 442 443 static int s3c_rtc_probe(struct platform_device *pdev) 444 { 445 struct s3c_rtc *info = NULL; 446 struct rtc_time rtc_tm; 447 struct resource *res; 448 int ret; 449 450 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 451 if (!info) 452 return -ENOMEM; 453 454 /* find the IRQs */ 455 info->irq_tick = platform_get_irq(pdev, 1); 456 if (info->irq_tick < 0) 457 return info->irq_tick; 458 459 info->dev = &pdev->dev; 460 info->data = of_device_get_match_data(&pdev->dev); 461 if (!info->data) { 462 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n"); 463 return -EINVAL; 464 } 465 spin_lock_init(&info->pie_lock); 466 spin_lock_init(&info->alarm_lock); 467 468 platform_set_drvdata(pdev, info); 469 470 info->irq_alarm = platform_get_irq(pdev, 0); 471 if (info->irq_alarm < 0) 472 return info->irq_alarm; 473 474 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n", 475 info->irq_tick, info->irq_alarm); 476 477 /* get the memory region */ 478 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 479 info->base = devm_ioremap_resource(&pdev->dev, res); 480 if (IS_ERR(info->base)) 481 return PTR_ERR(info->base); 482 483 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); 484 if (IS_ERR(info->rtc_clk)) { 485 ret = PTR_ERR(info->rtc_clk); 486 if (ret != -EPROBE_DEFER) 487 dev_err(&pdev->dev, "failed to find rtc clock\n"); 488 else 489 dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n"); 490 return ret; 491 } 492 ret = clk_prepare_enable(info->rtc_clk); 493 if (ret) 494 return ret; 495 496 if (info->data->needs_src_clk) { 497 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); 498 if (IS_ERR(info->rtc_src_clk)) { 499 ret = PTR_ERR(info->rtc_src_clk); 500 if (ret != -EPROBE_DEFER) 501 dev_err(&pdev->dev, 502 "failed to find rtc source clock\n"); 503 else 504 dev_dbg(&pdev->dev, 505 "probe deferred due to missing rtc src clk\n"); 506 goto err_src_clk; 507 } 508 ret = clk_prepare_enable(info->rtc_src_clk); 509 if (ret) 510 goto err_src_clk; 511 } 512 513 /* check to see if everything is setup correctly */ 514 if (info->data->enable) 515 info->data->enable(info); 516 517 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", 518 readw(info->base + S3C2410_RTCCON)); 519 520 device_init_wakeup(&pdev->dev, 1); 521 522 /* Check RTC Time */ 523 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) { 524 rtc_tm.tm_year = 100; 525 rtc_tm.tm_mon = 0; 526 rtc_tm.tm_mday = 1; 527 rtc_tm.tm_hour = 0; 528 rtc_tm.tm_min = 0; 529 rtc_tm.tm_sec = 0; 530 531 s3c_rtc_settime(&pdev->dev, &rtc_tm); 532 533 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); 534 } 535 536 /* register RTC and exit */ 537 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, 538 THIS_MODULE); 539 if (IS_ERR(info->rtc)) { 540 dev_err(&pdev->dev, "cannot attach rtc\n"); 541 ret = PTR_ERR(info->rtc); 542 goto err_nortc; 543 } 544 545 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, 546 0, "s3c2410-rtc alarm", info); 547 if (ret) { 548 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); 549 goto err_nortc; 550 } 551 552 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, 553 0, "s3c2410-rtc tick", info); 554 if (ret) { 555 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); 556 goto err_nortc; 557 } 558 559 if (info->data->select_tick_clk) 560 info->data->select_tick_clk(info); 561 562 s3c_rtc_setfreq(info, 1); 563 564 s3c_rtc_disable_clk(info); 565 566 return 0; 567 568 err_nortc: 569 if (info->data->disable) 570 info->data->disable(info); 571 572 if (info->data->needs_src_clk) 573 clk_disable_unprepare(info->rtc_src_clk); 574 err_src_clk: 575 clk_disable_unprepare(info->rtc_clk); 576 577 return ret; 578 } 579 580 #ifdef CONFIG_PM_SLEEP 581 582 static int s3c_rtc_suspend(struct device *dev) 583 { 584 struct s3c_rtc *info = dev_get_drvdata(dev); 585 int ret; 586 587 ret = s3c_rtc_enable_clk(info); 588 if (ret) 589 return ret; 590 591 /* save TICNT for anyone using periodic interrupts */ 592 if (info->data->save_tick_cnt) 593 info->data->save_tick_cnt(info); 594 595 if (info->data->disable) 596 info->data->disable(info); 597 598 if (device_may_wakeup(dev) && !info->wake_en) { 599 if (enable_irq_wake(info->irq_alarm) == 0) 600 info->wake_en = true; 601 else 602 dev_err(dev, "enable_irq_wake failed\n"); 603 } 604 605 return 0; 606 } 607 608 static int s3c_rtc_resume(struct device *dev) 609 { 610 struct s3c_rtc *info = dev_get_drvdata(dev); 611 612 if (info->data->enable) 613 info->data->enable(info); 614 615 if (info->data->restore_tick_cnt) 616 info->data->restore_tick_cnt(info); 617 618 s3c_rtc_disable_clk(info); 619 620 if (device_may_wakeup(dev) && info->wake_en) { 621 disable_irq_wake(info->irq_alarm); 622 info->wake_en = false; 623 } 624 625 return 0; 626 } 627 #endif 628 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); 629 630 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) 631 { 632 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 633 } 634 635 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) 636 { 637 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 638 writeb(mask, info->base + S3C2410_INTP); 639 } 640 641 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) 642 { 643 unsigned int tmp = 0; 644 int val; 645 646 tmp = readb(info->base + S3C2410_TICNT); 647 tmp &= S3C2410_TICNT_ENABLE; 648 649 val = (info->rtc->max_user_freq / freq) - 1; 650 tmp |= val; 651 652 writel(tmp, info->base + S3C2410_TICNT); 653 } 654 655 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) 656 { 657 unsigned int tmp = 0; 658 int val; 659 660 tmp = readb(info->base + S3C2410_TICNT); 661 tmp &= S3C2410_TICNT_ENABLE; 662 663 val = (info->rtc->max_user_freq / freq) - 1; 664 665 tmp |= S3C2443_TICNT_PART(val); 666 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 667 668 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); 669 670 writel(tmp, info->base + S3C2410_TICNT); 671 } 672 673 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) 674 { 675 unsigned int tmp = 0; 676 int val; 677 678 tmp = readb(info->base + S3C2410_TICNT); 679 tmp &= S3C2410_TICNT_ENABLE; 680 681 val = (info->rtc->max_user_freq / freq) - 1; 682 683 tmp |= S3C2443_TICNT_PART(val); 684 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 685 686 writel(tmp, info->base + S3C2410_TICNT); 687 } 688 689 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) 690 { 691 int val; 692 693 val = (info->rtc->max_user_freq / freq) - 1; 694 writel(val, info->base + S3C2410_TICNT); 695 } 696 697 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 698 { 699 unsigned int ticnt; 700 701 ticnt = readb(info->base + S3C2410_TICNT); 702 ticnt &= S3C2410_TICNT_ENABLE; 703 704 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 705 } 706 707 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) 708 { 709 unsigned int con; 710 711 con = readw(info->base + S3C2410_RTCCON); 712 con |= S3C2443_RTCCON_TICSEL; 713 writew(con, info->base + S3C2410_RTCCON); 714 } 715 716 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 717 { 718 unsigned int ticnt; 719 720 ticnt = readw(info->base + S3C2410_RTCCON); 721 ticnt &= S3C64XX_RTCCON_TICEN; 722 723 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 724 } 725 726 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) 727 { 728 info->ticnt_save = readb(info->base + S3C2410_TICNT); 729 } 730 731 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) 732 { 733 writeb(info->ticnt_save, info->base + S3C2410_TICNT); 734 } 735 736 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) 737 { 738 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); 739 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; 740 info->ticnt_save = readl(info->base + S3C2410_TICNT); 741 } 742 743 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) 744 { 745 unsigned int con; 746 747 writel(info->ticnt_save, info->base + S3C2410_TICNT); 748 if (info->ticnt_en_save) { 749 con = readw(info->base + S3C2410_RTCCON); 750 writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON); 751 } 752 } 753 754 static struct s3c_rtc_data const s3c2410_rtc_data = { 755 .max_user_freq = 128, 756 .irq_handler = s3c24xx_rtc_irq, 757 .set_freq = s3c2410_rtc_setfreq, 758 .enable_tick = s3c24xx_rtc_enable_tick, 759 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 760 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 761 .enable = s3c24xx_rtc_enable, 762 .disable = s3c24xx_rtc_disable, 763 }; 764 765 static struct s3c_rtc_data const s3c2416_rtc_data = { 766 .max_user_freq = 32768, 767 .irq_handler = s3c24xx_rtc_irq, 768 .set_freq = s3c2416_rtc_setfreq, 769 .enable_tick = s3c24xx_rtc_enable_tick, 770 .select_tick_clk = s3c2416_rtc_select_tick_clk, 771 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 772 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 773 .enable = s3c24xx_rtc_enable, 774 .disable = s3c24xx_rtc_disable, 775 }; 776 777 static struct s3c_rtc_data const s3c2443_rtc_data = { 778 .max_user_freq = 32768, 779 .irq_handler = s3c24xx_rtc_irq, 780 .set_freq = s3c2443_rtc_setfreq, 781 .enable_tick = s3c24xx_rtc_enable_tick, 782 .select_tick_clk = s3c2416_rtc_select_tick_clk, 783 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 784 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 785 .enable = s3c24xx_rtc_enable, 786 .disable = s3c24xx_rtc_disable, 787 }; 788 789 static struct s3c_rtc_data const s3c6410_rtc_data = { 790 .max_user_freq = 32768, 791 .needs_src_clk = true, 792 .irq_handler = s3c6410_rtc_irq, 793 .set_freq = s3c6410_rtc_setfreq, 794 .enable_tick = s3c6410_rtc_enable_tick, 795 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 796 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 797 .enable = s3c24xx_rtc_enable, 798 .disable = s3c6410_rtc_disable, 799 }; 800 801 static const struct of_device_id s3c_rtc_dt_match[] = { 802 { 803 .compatible = "samsung,s3c2410-rtc", 804 .data = &s3c2410_rtc_data, 805 }, { 806 .compatible = "samsung,s3c2416-rtc", 807 .data = &s3c2416_rtc_data, 808 }, { 809 .compatible = "samsung,s3c2443-rtc", 810 .data = &s3c2443_rtc_data, 811 }, { 812 .compatible = "samsung,s3c6410-rtc", 813 .data = &s3c6410_rtc_data, 814 }, { 815 .compatible = "samsung,exynos3250-rtc", 816 .data = &s3c6410_rtc_data, 817 }, 818 { /* sentinel */ }, 819 }; 820 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); 821 822 static struct platform_driver s3c_rtc_driver = { 823 .probe = s3c_rtc_probe, 824 .remove = s3c_rtc_remove, 825 .driver = { 826 .name = "s3c-rtc", 827 .pm = &s3c_rtc_pm_ops, 828 .of_match_table = of_match_ptr(s3c_rtc_dt_match), 829 }, 830 }; 831 module_platform_driver(s3c_rtc_driver); 832 833 MODULE_DESCRIPTION("Samsung S3C RTC Driver"); 834 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 835 MODULE_LICENSE("GPL"); 836 MODULE_ALIAS("platform:s3c2410-rtc"); 837