1 /* drivers/rtc/rtc-s3c.c 2 * 3 * Copyright (c) 2010 Samsung Electronics Co., Ltd. 4 * http://www.samsung.com/ 5 * 6 * Copyright (c) 2004,2006 Simtec Electronics 7 * Ben Dooks, <ben@simtec.co.uk> 8 * http://armlinux.simtec.co.uk/ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 * 14 * S3C2410/S3C2440/S3C24XX Internal RTC Driver 15 */ 16 17 #include <linux/module.h> 18 #include <linux/fs.h> 19 #include <linux/string.h> 20 #include <linux/init.h> 21 #include <linux/platform_device.h> 22 #include <linux/interrupt.h> 23 #include <linux/rtc.h> 24 #include <linux/bcd.h> 25 #include <linux/clk.h> 26 #include <linux/log2.h> 27 #include <linux/slab.h> 28 #include <linux/of.h> 29 #include <linux/uaccess.h> 30 #include <linux/io.h> 31 32 #include <asm/irq.h> 33 #include "rtc-s3c.h" 34 35 struct s3c_rtc { 36 struct device *dev; 37 struct rtc_device *rtc; 38 39 void __iomem *base; 40 struct clk *rtc_clk; 41 struct clk *rtc_src_clk; 42 bool clk_disabled; 43 44 struct s3c_rtc_data *data; 45 46 int irq_alarm; 47 int irq_tick; 48 49 spinlock_t pie_lock; 50 spinlock_t alarm_clk_lock; 51 52 int ticnt_save, ticnt_en_save; 53 bool wake_en; 54 }; 55 56 struct s3c_rtc_data { 57 int max_user_freq; 58 bool needs_src_clk; 59 60 void (*irq_handler) (struct s3c_rtc *info, int mask); 61 void (*set_freq) (struct s3c_rtc *info, int freq); 62 void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq); 63 void (*select_tick_clk) (struct s3c_rtc *info); 64 void (*save_tick_cnt) (struct s3c_rtc *info); 65 void (*restore_tick_cnt) (struct s3c_rtc *info); 66 void (*enable) (struct s3c_rtc *info); 67 void (*disable) (struct s3c_rtc *info); 68 }; 69 70 static void s3c_rtc_enable_clk(struct s3c_rtc *info) 71 { 72 unsigned long irq_flags; 73 74 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags); 75 if (info->clk_disabled) { 76 clk_enable(info->rtc_clk); 77 if (info->data->needs_src_clk) 78 clk_enable(info->rtc_src_clk); 79 info->clk_disabled = false; 80 } 81 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags); 82 } 83 84 static void s3c_rtc_disable_clk(struct s3c_rtc *info) 85 { 86 unsigned long irq_flags; 87 88 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags); 89 if (!info->clk_disabled) { 90 if (info->data->needs_src_clk) 91 clk_disable(info->rtc_src_clk); 92 clk_disable(info->rtc_clk); 93 info->clk_disabled = true; 94 } 95 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags); 96 } 97 98 /* IRQ Handlers */ 99 static irqreturn_t s3c_rtc_tickirq(int irq, void *id) 100 { 101 struct s3c_rtc *info = (struct s3c_rtc *)id; 102 103 if (info->data->irq_handler) 104 info->data->irq_handler(info, S3C2410_INTP_TIC); 105 106 return IRQ_HANDLED; 107 } 108 109 static irqreturn_t s3c_rtc_alarmirq(int irq, void *id) 110 { 111 struct s3c_rtc *info = (struct s3c_rtc *)id; 112 113 if (info->data->irq_handler) 114 info->data->irq_handler(info, S3C2410_INTP_ALM); 115 116 return IRQ_HANDLED; 117 } 118 119 /* Update control registers */ 120 static int s3c_rtc_setaie(struct device *dev, unsigned int enabled) 121 { 122 struct s3c_rtc *info = dev_get_drvdata(dev); 123 unsigned int tmp; 124 125 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled); 126 127 s3c_rtc_enable_clk(info); 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 s3c_rtc_disable_clk(info); 137 138 if (enabled) 139 s3c_rtc_enable_clk(info); 140 else 141 s3c_rtc_disable_clk(info); 142 143 return 0; 144 } 145 146 /* Set RTC frequency */ 147 static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq) 148 { 149 if (!is_power_of_2(freq)) 150 return -EINVAL; 151 152 spin_lock_irq(&info->pie_lock); 153 154 if (info->data->set_freq) 155 info->data->set_freq(info, freq); 156 157 spin_unlock_irq(&info->pie_lock); 158 159 return 0; 160 } 161 162 /* Time read/write */ 163 static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) 164 { 165 struct s3c_rtc *info = dev_get_drvdata(dev); 166 unsigned int have_retried = 0; 167 168 s3c_rtc_enable_clk(info); 169 170 retry_get_time: 171 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN); 172 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR); 173 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE); 174 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON); 175 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR); 176 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC); 177 178 /* the only way to work out whether the system was mid-update 179 * when we read it is to check the second counter, and if it 180 * is zero, then we re-try the entire read 181 */ 182 183 if (rtc_tm->tm_sec == 0 && !have_retried) { 184 have_retried = 1; 185 goto retry_get_time; 186 } 187 188 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); 189 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); 190 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); 191 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); 192 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); 193 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); 194 195 s3c_rtc_disable_clk(info); 196 197 rtc_tm->tm_year += 100; 198 199 dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n", 200 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, 201 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); 202 203 rtc_tm->tm_mon -= 1; 204 205 return rtc_valid_tm(rtc_tm); 206 } 207 208 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) 209 { 210 struct s3c_rtc *info = dev_get_drvdata(dev); 211 int year = tm->tm_year - 100; 212 213 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n", 214 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, 215 tm->tm_hour, tm->tm_min, tm->tm_sec); 216 217 /* we get around y2k by simply not supporting it */ 218 219 if (year < 0 || year >= 100) { 220 dev_err(dev, "rtc only supports 100 years\n"); 221 return -EINVAL; 222 } 223 224 s3c_rtc_enable_clk(info); 225 226 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC); 227 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN); 228 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR); 229 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE); 230 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON); 231 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR); 232 233 s3c_rtc_disable_clk(info); 234 235 return 0; 236 } 237 238 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) 239 { 240 struct s3c_rtc *info = dev_get_drvdata(dev); 241 struct rtc_time *alm_tm = &alrm->time; 242 unsigned int alm_en; 243 244 s3c_rtc_enable_clk(info); 245 246 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC); 247 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN); 248 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR); 249 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON); 250 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE); 251 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR); 252 253 alm_en = readb(info->base + S3C2410_RTCALM); 254 255 s3c_rtc_disable_clk(info); 256 257 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0; 258 259 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n", 260 alm_en, 261 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, 262 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); 263 264 /* decode the alarm enable field */ 265 if (alm_en & S3C2410_RTCALM_SECEN) 266 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); 267 else 268 alm_tm->tm_sec = -1; 269 270 if (alm_en & S3C2410_RTCALM_MINEN) 271 alm_tm->tm_min = bcd2bin(alm_tm->tm_min); 272 else 273 alm_tm->tm_min = -1; 274 275 if (alm_en & S3C2410_RTCALM_HOUREN) 276 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); 277 else 278 alm_tm->tm_hour = -1; 279 280 if (alm_en & S3C2410_RTCALM_DAYEN) 281 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday); 282 else 283 alm_tm->tm_mday = -1; 284 285 if (alm_en & S3C2410_RTCALM_MONEN) { 286 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon); 287 alm_tm->tm_mon -= 1; 288 } else { 289 alm_tm->tm_mon = -1; 290 } 291 292 if (alm_en & S3C2410_RTCALM_YEAREN) 293 alm_tm->tm_year = bcd2bin(alm_tm->tm_year); 294 else 295 alm_tm->tm_year = -1; 296 297 return 0; 298 } 299 300 static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) 301 { 302 struct s3c_rtc *info = dev_get_drvdata(dev); 303 struct rtc_time *tm = &alrm->time; 304 unsigned int alrm_en; 305 306 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n", 307 alrm->enabled, 308 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, 309 tm->tm_hour, tm->tm_min, tm->tm_sec); 310 311 s3c_rtc_enable_clk(info); 312 313 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; 314 writeb(0x00, info->base + S3C2410_RTCALM); 315 316 if (tm->tm_sec < 60 && tm->tm_sec >= 0) { 317 alrm_en |= S3C2410_RTCALM_SECEN; 318 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC); 319 } 320 321 if (tm->tm_min < 60 && tm->tm_min >= 0) { 322 alrm_en |= S3C2410_RTCALM_MINEN; 323 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN); 324 } 325 326 if (tm->tm_hour < 24 && tm->tm_hour >= 0) { 327 alrm_en |= S3C2410_RTCALM_HOUREN; 328 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR); 329 } 330 331 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en); 332 333 writeb(alrm_en, info->base + S3C2410_RTCALM); 334 335 s3c_rtc_disable_clk(info); 336 337 s3c_rtc_setaie(dev, alrm->enabled); 338 339 return 0; 340 } 341 342 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) 343 { 344 struct s3c_rtc *info = dev_get_drvdata(dev); 345 346 s3c_rtc_enable_clk(info); 347 348 if (info->data->enable_tick) 349 info->data->enable_tick(info, seq); 350 351 s3c_rtc_disable_clk(info); 352 353 return 0; 354 } 355 356 static const struct rtc_class_ops s3c_rtcops = { 357 .read_time = s3c_rtc_gettime, 358 .set_time = s3c_rtc_settime, 359 .read_alarm = s3c_rtc_getalarm, 360 .set_alarm = s3c_rtc_setalarm, 361 .proc = s3c_rtc_proc, 362 .alarm_irq_enable = s3c_rtc_setaie, 363 }; 364 365 static void s3c24xx_rtc_enable(struct s3c_rtc *info) 366 { 367 unsigned int con, tmp; 368 369 con = readw(info->base + S3C2410_RTCCON); 370 /* re-enable the device, and check it is ok */ 371 if ((con & S3C2410_RTCCON_RTCEN) == 0) { 372 dev_info(info->dev, "rtc disabled, re-enabling\n"); 373 374 tmp = readw(info->base + S3C2410_RTCCON); 375 writew(tmp | S3C2410_RTCCON_RTCEN, 376 info->base + S3C2410_RTCCON); 377 } 378 379 if (con & S3C2410_RTCCON_CNTSEL) { 380 dev_info(info->dev, "removing RTCCON_CNTSEL\n"); 381 382 tmp = readw(info->base + S3C2410_RTCCON); 383 writew(tmp & ~S3C2410_RTCCON_CNTSEL, 384 info->base + S3C2410_RTCCON); 385 } 386 387 if (con & S3C2410_RTCCON_CLKRST) { 388 dev_info(info->dev, "removing RTCCON_CLKRST\n"); 389 390 tmp = readw(info->base + S3C2410_RTCCON); 391 writew(tmp & ~S3C2410_RTCCON_CLKRST, 392 info->base + S3C2410_RTCCON); 393 } 394 } 395 396 static void s3c24xx_rtc_disable(struct s3c_rtc *info) 397 { 398 unsigned int con; 399 400 con = readw(info->base + S3C2410_RTCCON); 401 con &= ~S3C2410_RTCCON_RTCEN; 402 writew(con, info->base + S3C2410_RTCCON); 403 404 con = readb(info->base + S3C2410_TICNT); 405 con &= ~S3C2410_TICNT_ENABLE; 406 writeb(con, info->base + S3C2410_TICNT); 407 } 408 409 static void s3c6410_rtc_disable(struct s3c_rtc *info) 410 { 411 unsigned int con; 412 413 con = readw(info->base + S3C2410_RTCCON); 414 con &= ~S3C64XX_RTCCON_TICEN; 415 con &= ~S3C2410_RTCCON_RTCEN; 416 writew(con, info->base + S3C2410_RTCCON); 417 } 418 419 static int s3c_rtc_remove(struct platform_device *pdev) 420 { 421 struct s3c_rtc *info = platform_get_drvdata(pdev); 422 423 s3c_rtc_setaie(info->dev, 0); 424 425 if (info->data->needs_src_clk) 426 clk_unprepare(info->rtc_src_clk); 427 clk_unprepare(info->rtc_clk); 428 429 return 0; 430 } 431 432 static const struct of_device_id s3c_rtc_dt_match[]; 433 434 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev) 435 { 436 const struct of_device_id *match; 437 438 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node); 439 return (struct s3c_rtc_data *)match->data; 440 } 441 442 static int s3c_rtc_probe(struct platform_device *pdev) 443 { 444 struct s3c_rtc *info = NULL; 445 struct rtc_time rtc_tm; 446 struct resource *res; 447 int ret; 448 449 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 450 if (!info) 451 return -ENOMEM; 452 453 /* find the IRQs */ 454 info->irq_tick = platform_get_irq(pdev, 1); 455 if (info->irq_tick < 0) { 456 dev_err(&pdev->dev, "no irq for rtc tick\n"); 457 return info->irq_tick; 458 } 459 460 info->dev = &pdev->dev; 461 info->data = s3c_rtc_get_data(pdev); 462 if (!info->data) { 463 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n"); 464 return -EINVAL; 465 } 466 spin_lock_init(&info->pie_lock); 467 spin_lock_init(&info->alarm_clk_lock); 468 469 platform_set_drvdata(pdev, info); 470 471 info->irq_alarm = platform_get_irq(pdev, 0); 472 if (info->irq_alarm < 0) { 473 dev_err(&pdev->dev, "no irq for alarm\n"); 474 return info->irq_alarm; 475 } 476 477 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n", 478 info->irq_tick, info->irq_alarm); 479 480 /* get the memory region */ 481 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 482 info->base = devm_ioremap_resource(&pdev->dev, res); 483 if (IS_ERR(info->base)) 484 return PTR_ERR(info->base); 485 486 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); 487 if (IS_ERR(info->rtc_clk)) { 488 dev_err(&pdev->dev, "failed to find rtc clock\n"); 489 return PTR_ERR(info->rtc_clk); 490 } 491 clk_prepare_enable(info->rtc_clk); 492 493 if (info->data->needs_src_clk) { 494 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); 495 if (IS_ERR(info->rtc_src_clk)) { 496 dev_err(&pdev->dev, 497 "failed to find rtc source clock\n"); 498 clk_disable_unprepare(info->rtc_clk); 499 return PTR_ERR(info->rtc_src_clk); 500 } 501 clk_prepare_enable(info->rtc_src_clk); 502 } 503 504 /* check to see if everything is setup correctly */ 505 if (info->data->enable) 506 info->data->enable(info); 507 508 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", 509 readw(info->base + S3C2410_RTCCON)); 510 511 device_init_wakeup(&pdev->dev, 1); 512 513 /* Check RTC Time */ 514 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) { 515 rtc_tm.tm_year = 100; 516 rtc_tm.tm_mon = 0; 517 rtc_tm.tm_mday = 1; 518 rtc_tm.tm_hour = 0; 519 rtc_tm.tm_min = 0; 520 rtc_tm.tm_sec = 0; 521 522 s3c_rtc_settime(&pdev->dev, &rtc_tm); 523 524 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); 525 } 526 527 /* register RTC and exit */ 528 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, 529 THIS_MODULE); 530 if (IS_ERR(info->rtc)) { 531 dev_err(&pdev->dev, "cannot attach rtc\n"); 532 ret = PTR_ERR(info->rtc); 533 goto err_nortc; 534 } 535 536 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, 537 0, "s3c2410-rtc alarm", info); 538 if (ret) { 539 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); 540 goto err_nortc; 541 } 542 543 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, 544 0, "s3c2410-rtc tick", info); 545 if (ret) { 546 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); 547 goto err_nortc; 548 } 549 550 if (info->data->select_tick_clk) 551 info->data->select_tick_clk(info); 552 553 s3c_rtc_setfreq(info, 1); 554 555 s3c_rtc_disable_clk(info); 556 557 return 0; 558 559 err_nortc: 560 if (info->data->disable) 561 info->data->disable(info); 562 563 if (info->data->needs_src_clk) 564 clk_disable_unprepare(info->rtc_src_clk); 565 clk_disable_unprepare(info->rtc_clk); 566 567 return ret; 568 } 569 570 #ifdef CONFIG_PM_SLEEP 571 572 static int s3c_rtc_suspend(struct device *dev) 573 { 574 struct s3c_rtc *info = dev_get_drvdata(dev); 575 576 s3c_rtc_enable_clk(info); 577 578 /* save TICNT for anyone using periodic interrupts */ 579 if (info->data->save_tick_cnt) 580 info->data->save_tick_cnt(info); 581 582 if (info->data->disable) 583 info->data->disable(info); 584 585 if (device_may_wakeup(dev) && !info->wake_en) { 586 if (enable_irq_wake(info->irq_alarm) == 0) 587 info->wake_en = true; 588 else 589 dev_err(dev, "enable_irq_wake failed\n"); 590 } 591 592 return 0; 593 } 594 595 static int s3c_rtc_resume(struct device *dev) 596 { 597 struct s3c_rtc *info = dev_get_drvdata(dev); 598 599 if (info->data->enable) 600 info->data->enable(info); 601 602 if (info->data->restore_tick_cnt) 603 info->data->restore_tick_cnt(info); 604 605 s3c_rtc_disable_clk(info); 606 607 if (device_may_wakeup(dev) && info->wake_en) { 608 disable_irq_wake(info->irq_alarm); 609 info->wake_en = false; 610 } 611 612 return 0; 613 } 614 #endif 615 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); 616 617 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) 618 { 619 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 620 } 621 622 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) 623 { 624 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 625 writeb(mask, info->base + S3C2410_INTP); 626 } 627 628 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) 629 { 630 unsigned int tmp = 0; 631 int val; 632 633 tmp = readb(info->base + S3C2410_TICNT); 634 tmp &= S3C2410_TICNT_ENABLE; 635 636 val = (info->rtc->max_user_freq / freq) - 1; 637 tmp |= val; 638 639 writel(tmp, info->base + S3C2410_TICNT); 640 } 641 642 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) 643 { 644 unsigned int tmp = 0; 645 int val; 646 647 tmp = readb(info->base + S3C2410_TICNT); 648 tmp &= S3C2410_TICNT_ENABLE; 649 650 val = (info->rtc->max_user_freq / freq) - 1; 651 652 tmp |= S3C2443_TICNT_PART(val); 653 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 654 655 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); 656 657 writel(tmp, info->base + S3C2410_TICNT); 658 } 659 660 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) 661 { 662 unsigned int tmp = 0; 663 int val; 664 665 tmp = readb(info->base + S3C2410_TICNT); 666 tmp &= S3C2410_TICNT_ENABLE; 667 668 val = (info->rtc->max_user_freq / freq) - 1; 669 670 tmp |= S3C2443_TICNT_PART(val); 671 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 672 673 writel(tmp, info->base + S3C2410_TICNT); 674 } 675 676 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) 677 { 678 int val; 679 680 val = (info->rtc->max_user_freq / freq) - 1; 681 writel(val, info->base + S3C2410_TICNT); 682 } 683 684 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 685 { 686 unsigned int ticnt; 687 688 ticnt = readb(info->base + S3C2410_TICNT); 689 ticnt &= S3C2410_TICNT_ENABLE; 690 691 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 692 } 693 694 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) 695 { 696 unsigned int con; 697 698 con = readw(info->base + S3C2410_RTCCON); 699 con |= S3C2443_RTCCON_TICSEL; 700 writew(con, info->base + S3C2410_RTCCON); 701 } 702 703 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 704 { 705 unsigned int ticnt; 706 707 ticnt = readw(info->base + S3C2410_RTCCON); 708 ticnt &= S3C64XX_RTCCON_TICEN; 709 710 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 711 } 712 713 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) 714 { 715 info->ticnt_save = readb(info->base + S3C2410_TICNT); 716 } 717 718 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) 719 { 720 writeb(info->ticnt_save, info->base + S3C2410_TICNT); 721 } 722 723 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) 724 { 725 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); 726 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; 727 info->ticnt_save = readl(info->base + S3C2410_TICNT); 728 } 729 730 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) 731 { 732 unsigned int con; 733 734 writel(info->ticnt_save, info->base + S3C2410_TICNT); 735 if (info->ticnt_en_save) { 736 con = readw(info->base + S3C2410_RTCCON); 737 writew(con | info->ticnt_en_save, 738 info->base + S3C2410_RTCCON); 739 } 740 } 741 742 static struct s3c_rtc_data const s3c2410_rtc_data = { 743 .max_user_freq = 128, 744 .irq_handler = s3c24xx_rtc_irq, 745 .set_freq = s3c2410_rtc_setfreq, 746 .enable_tick = s3c24xx_rtc_enable_tick, 747 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 748 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 749 .enable = s3c24xx_rtc_enable, 750 .disable = s3c24xx_rtc_disable, 751 }; 752 753 static struct s3c_rtc_data const s3c2416_rtc_data = { 754 .max_user_freq = 32768, 755 .irq_handler = s3c24xx_rtc_irq, 756 .set_freq = s3c2416_rtc_setfreq, 757 .enable_tick = s3c24xx_rtc_enable_tick, 758 .select_tick_clk = s3c2416_rtc_select_tick_clk, 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 s3c2443_rtc_data = { 766 .max_user_freq = 32768, 767 .irq_handler = s3c24xx_rtc_irq, 768 .set_freq = s3c2443_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 s3c6410_rtc_data = { 778 .max_user_freq = 32768, 779 .needs_src_clk = true, 780 .irq_handler = s3c6410_rtc_irq, 781 .set_freq = s3c6410_rtc_setfreq, 782 .enable_tick = s3c6410_rtc_enable_tick, 783 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 784 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 785 .enable = s3c24xx_rtc_enable, 786 .disable = s3c6410_rtc_disable, 787 }; 788 789 static const struct of_device_id s3c_rtc_dt_match[] = { 790 { 791 .compatible = "samsung,s3c2410-rtc", 792 .data = (void *)&s3c2410_rtc_data, 793 }, { 794 .compatible = "samsung,s3c2416-rtc", 795 .data = (void *)&s3c2416_rtc_data, 796 }, { 797 .compatible = "samsung,s3c2443-rtc", 798 .data = (void *)&s3c2443_rtc_data, 799 }, { 800 .compatible = "samsung,s3c6410-rtc", 801 .data = (void *)&s3c6410_rtc_data, 802 }, { 803 .compatible = "samsung,exynos3250-rtc", 804 .data = (void *)&s3c6410_rtc_data, 805 }, 806 { /* sentinel */ }, 807 }; 808 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); 809 810 static struct platform_driver s3c_rtc_driver = { 811 .probe = s3c_rtc_probe, 812 .remove = s3c_rtc_remove, 813 .driver = { 814 .name = "s3c-rtc", 815 .pm = &s3c_rtc_pm_ops, 816 .of_match_table = of_match_ptr(s3c_rtc_dt_match), 817 }, 818 }; 819 module_platform_driver(s3c_rtc_driver); 820 821 MODULE_DESCRIPTION("Samsung S3C RTC Driver"); 822 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 823 MODULE_LICENSE("GPL"); 824 MODULE_ALIAS("platform:s3c2410-rtc"); 825