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 35struct 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 enabled; 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 56struct 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 70static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable) 71{ 72 unsigned long irq_flags; 73 74 spin_lock_irqsave(&info->alarm_clk_lock, irq_flags); 75 if (enable) { 76 if (!info->enabled) { 77 clk_enable(info->rtc_clk); 78 if (info->data->needs_src_clk) 79 clk_enable(info->rtc_src_clk); 80 info->enabled = true; 81 } 82 } else { 83 if (info->enabled) { 84 if (info->data->needs_src_clk) 85 clk_disable(info->rtc_src_clk); 86 clk_disable(info->rtc_clk); 87 info->enabled = false; 88 } 89 } 90 spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags); 91} 92 93/* IRQ Handlers */ 94static irqreturn_t s3c_rtc_tickirq(int irq, void *id) 95{ 96 struct s3c_rtc *info = (struct s3c_rtc *)id; 97 98 if (info->data->irq_handler) 99 info->data->irq_handler(info, S3C2410_INTP_TIC); 100 101 return IRQ_HANDLED; 102} 103 104static irqreturn_t s3c_rtc_alarmirq(int irq, void *id) 105{ 106 struct s3c_rtc *info = (struct s3c_rtc *)id; 107 108 if (info->data->irq_handler) 109 info->data->irq_handler(info, S3C2410_INTP_ALM); 110 111 return IRQ_HANDLED; 112} 113 114/* Update control registers */ 115static int s3c_rtc_setaie(struct device *dev, unsigned int enabled) 116{ 117 struct s3c_rtc *info = dev_get_drvdata(dev); 118 unsigned int tmp; 119 120 dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled); 121 122 clk_enable(info->rtc_clk); 123 if (info->data->needs_src_clk) 124 clk_enable(info->rtc_src_clk); 125 tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN; 126 127 if (enabled) 128 tmp |= S3C2410_RTCALM_ALMEN; 129 130 writeb(tmp, info->base + S3C2410_RTCALM); 131 if (info->data->needs_src_clk) 132 clk_disable(info->rtc_src_clk); 133 clk_disable(info->rtc_clk); 134 135 s3c_rtc_alarm_clk_enable(info, enabled); 136 137 return 0; 138} 139 140/* Set RTC frequency */ 141static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq) 142{ 143 if (!is_power_of_2(freq)) 144 return -EINVAL; 145 146 clk_enable(info->rtc_clk); 147 if (info->data->needs_src_clk) 148 clk_enable(info->rtc_src_clk); 149 spin_lock_irq(&info->pie_lock); 150 151 if (info->data->set_freq) 152 info->data->set_freq(info, freq); 153 154 spin_unlock_irq(&info->pie_lock); 155 if (info->data->needs_src_clk) 156 clk_disable(info->rtc_src_clk); 157 clk_disable(info->rtc_clk); 158 159 return 0; 160} 161 162/* Time read/write */ 163static 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 clk_enable(info->rtc_clk); 169 if (info->data->needs_src_clk) 170 clk_enable(info->rtc_src_clk); 171 172 retry_get_time: 173 rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN); 174 rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR); 175 rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE); 176 rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON); 177 rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR); 178 rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC); 179 180 /* the only way to work out whether the system was mid-update 181 * when we read it is to check the second counter, and if it 182 * is zero, then we re-try the entire read 183 */ 184 185 if (rtc_tm->tm_sec == 0 && !have_retried) { 186 have_retried = 1; 187 goto retry_get_time; 188 } 189 190 rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); 191 rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); 192 rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); 193 rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); 194 rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); 195 rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); 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 if (info->data->needs_src_clk) 206 clk_disable(info->rtc_src_clk); 207 clk_disable(info->rtc_clk); 208 209 return rtc_valid_tm(rtc_tm); 210} 211 212static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) 213{ 214 struct s3c_rtc *info = dev_get_drvdata(dev); 215 int year = tm->tm_year - 100; 216 217 dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n", 218 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, 219 tm->tm_hour, tm->tm_min, tm->tm_sec); 220 221 /* we get around y2k by simply not supporting it */ 222 223 if (year < 0 || year >= 100) { 224 dev_err(dev, "rtc only supports 100 years\n"); 225 return -EINVAL; 226 } 227 228 clk_enable(info->rtc_clk); 229 if (info->data->needs_src_clk) 230 clk_enable(info->rtc_src_clk); 231 232 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC); 233 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN); 234 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR); 235 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE); 236 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON); 237 writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR); 238 239 if (info->data->needs_src_clk) 240 clk_disable(info->rtc_src_clk); 241 clk_disable(info->rtc_clk); 242 243 return 0; 244} 245 246static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) 247{ 248 struct s3c_rtc *info = dev_get_drvdata(dev); 249 struct rtc_time *alm_tm = &alrm->time; 250 unsigned int alm_en; 251 252 clk_enable(info->rtc_clk); 253 if (info->data->needs_src_clk) 254 clk_enable(info->rtc_src_clk); 255 256 alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC); 257 alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN); 258 alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR); 259 alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON); 260 alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE); 261 alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR); 262 263 alm_en = readb(info->base + S3C2410_RTCALM); 264 265 alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0; 266 267 dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n", 268 alm_en, 269 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, 270 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); 271 272 273 /* decode the alarm enable field */ 274 275 if (alm_en & S3C2410_RTCALM_SECEN) 276 alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); 277 else 278 alm_tm->tm_sec = -1; 279 280 if (alm_en & S3C2410_RTCALM_MINEN) 281 alm_tm->tm_min = bcd2bin(alm_tm->tm_min); 282 else 283 alm_tm->tm_min = -1; 284 285 if (alm_en & S3C2410_RTCALM_HOUREN) 286 alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); 287 else 288 alm_tm->tm_hour = -1; 289 290 if (alm_en & S3C2410_RTCALM_DAYEN) 291 alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday); 292 else 293 alm_tm->tm_mday = -1; 294 295 if (alm_en & S3C2410_RTCALM_MONEN) { 296 alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon); 297 alm_tm->tm_mon -= 1; 298 } else { 299 alm_tm->tm_mon = -1; 300 } 301 302 if (alm_en & S3C2410_RTCALM_YEAREN) 303 alm_tm->tm_year = bcd2bin(alm_tm->tm_year); 304 else 305 alm_tm->tm_year = -1; 306 307 if (info->data->needs_src_clk) 308 clk_disable(info->rtc_src_clk); 309 clk_disable(info->rtc_clk); 310 311 return 0; 312} 313 314static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) 315{ 316 struct s3c_rtc *info = dev_get_drvdata(dev); 317 struct rtc_time *tm = &alrm->time; 318 unsigned int alrm_en; 319 320 clk_enable(info->rtc_clk); 321 if (info->data->needs_src_clk) 322 clk_enable(info->rtc_src_clk); 323 324 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n", 325 alrm->enabled, 326 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, 327 tm->tm_hour, tm->tm_min, tm->tm_sec); 328 329 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; 330 writeb(0x00, info->base + S3C2410_RTCALM); 331 332 if (tm->tm_sec < 60 && tm->tm_sec >= 0) { 333 alrm_en |= S3C2410_RTCALM_SECEN; 334 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC); 335 } 336 337 if (tm->tm_min < 60 && tm->tm_min >= 0) { 338 alrm_en |= S3C2410_RTCALM_MINEN; 339 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN); 340 } 341 342 if (tm->tm_hour < 24 && tm->tm_hour >= 0) { 343 alrm_en |= S3C2410_RTCALM_HOUREN; 344 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR); 345 } 346 347 dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en); 348 349 writeb(alrm_en, info->base + S3C2410_RTCALM); 350 351 s3c_rtc_setaie(dev, alrm->enabled); 352 353 if (info->data->needs_src_clk) 354 clk_disable(info->rtc_src_clk); 355 clk_disable(info->rtc_clk); 356 357 return 0; 358} 359 360static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) 361{ 362 struct s3c_rtc *info = dev_get_drvdata(dev); 363 364 clk_enable(info->rtc_clk); 365 if (info->data->needs_src_clk) 366 clk_enable(info->rtc_src_clk); 367 368 if (info->data->enable_tick) 369 info->data->enable_tick(info, seq); 370 371 if (info->data->needs_src_clk) 372 clk_disable(info->rtc_src_clk); 373 clk_disable(info->rtc_clk); 374 375 return 0; 376} 377 378static const struct rtc_class_ops s3c_rtcops = { 379 .read_time = s3c_rtc_gettime, 380 .set_time = s3c_rtc_settime, 381 .read_alarm = s3c_rtc_getalarm, 382 .set_alarm = s3c_rtc_setalarm, 383 .proc = s3c_rtc_proc, 384 .alarm_irq_enable = s3c_rtc_setaie, 385}; 386 387static void s3c24xx_rtc_enable(struct s3c_rtc *info) 388{ 389 unsigned int con, tmp; 390 391 clk_enable(info->rtc_clk); 392 if (info->data->needs_src_clk) 393 clk_enable(info->rtc_src_clk); 394 395 con = readw(info->base + S3C2410_RTCCON); 396 /* re-enable the device, and check it is ok */ 397 if ((con & S3C2410_RTCCON_RTCEN) == 0) { 398 dev_info(info->dev, "rtc disabled, re-enabling\n"); 399 400 tmp = readw(info->base + S3C2410_RTCCON); 401 writew(tmp | S3C2410_RTCCON_RTCEN, 402 info->base + S3C2410_RTCCON); 403 } 404 405 if (con & S3C2410_RTCCON_CNTSEL) { 406 dev_info(info->dev, "removing RTCCON_CNTSEL\n"); 407 408 tmp = readw(info->base + S3C2410_RTCCON); 409 writew(tmp & ~S3C2410_RTCCON_CNTSEL, 410 info->base + S3C2410_RTCCON); 411 } 412 413 if (con & S3C2410_RTCCON_CLKRST) { 414 dev_info(info->dev, "removing RTCCON_CLKRST\n"); 415 416 tmp = readw(info->base + S3C2410_RTCCON); 417 writew(tmp & ~S3C2410_RTCCON_CLKRST, 418 info->base + S3C2410_RTCCON); 419 } 420 421 if (info->data->needs_src_clk) 422 clk_disable(info->rtc_src_clk); 423 clk_disable(info->rtc_clk); 424} 425 426static void s3c24xx_rtc_disable(struct s3c_rtc *info) 427{ 428 unsigned int con; 429 430 clk_enable(info->rtc_clk); 431 if (info->data->needs_src_clk) 432 clk_enable(info->rtc_src_clk); 433 434 con = readw(info->base + S3C2410_RTCCON); 435 con &= ~S3C2410_RTCCON_RTCEN; 436 writew(con, info->base + S3C2410_RTCCON); 437 438 con = readb(info->base + S3C2410_TICNT); 439 con &= ~S3C2410_TICNT_ENABLE; 440 writeb(con, info->base + S3C2410_TICNT); 441 442 if (info->data->needs_src_clk) 443 clk_disable(info->rtc_src_clk); 444 clk_disable(info->rtc_clk); 445} 446 447static void s3c6410_rtc_disable(struct s3c_rtc *info) 448{ 449 unsigned int con; 450 451 clk_enable(info->rtc_clk); 452 if (info->data->needs_src_clk) 453 clk_enable(info->rtc_src_clk); 454 455 con = readw(info->base + S3C2410_RTCCON); 456 con &= ~S3C64XX_RTCCON_TICEN; 457 con &= ~S3C2410_RTCCON_RTCEN; 458 writew(con, info->base + S3C2410_RTCCON); 459 460 if (info->data->needs_src_clk) 461 clk_disable(info->rtc_src_clk); 462 clk_disable(info->rtc_clk); 463} 464 465static int s3c_rtc_remove(struct platform_device *pdev) 466{ 467 struct s3c_rtc *info = platform_get_drvdata(pdev); 468 469 s3c_rtc_setaie(info->dev, 0); 470 471 clk_unprepare(info->rtc_clk); 472 info->rtc_clk = NULL; 473 474 return 0; 475} 476 477static const struct of_device_id s3c_rtc_dt_match[]; 478 479static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev) 480{ 481 const struct of_device_id *match; 482 483 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node); 484 return (struct s3c_rtc_data *)match->data; 485} 486 487static int s3c_rtc_probe(struct platform_device *pdev) 488{ 489 struct s3c_rtc *info = NULL; 490 struct rtc_time rtc_tm; 491 struct resource *res; 492 int ret; 493 494 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 495 if (!info) 496 return -ENOMEM; 497 498 /* find the IRQs */ 499 info->irq_tick = platform_get_irq(pdev, 1); 500 if (info->irq_tick < 0) { 501 dev_err(&pdev->dev, "no irq for rtc tick\n"); 502 return info->irq_tick; 503 } 504 505 info->dev = &pdev->dev; 506 info->data = s3c_rtc_get_data(pdev); 507 if (!info->data) { 508 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n"); 509 return -EINVAL; 510 } 511 spin_lock_init(&info->pie_lock); 512 spin_lock_init(&info->alarm_clk_lock); 513 514 platform_set_drvdata(pdev, info); 515 516 info->irq_alarm = platform_get_irq(pdev, 0); 517 if (info->irq_alarm < 0) { 518 dev_err(&pdev->dev, "no irq for alarm\n"); 519 return info->irq_alarm; 520 } 521 522 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n", 523 info->irq_tick, info->irq_alarm); 524 525 /* get the memory region */ 526 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 527 info->base = devm_ioremap_resource(&pdev->dev, res); 528 if (IS_ERR(info->base)) 529 return PTR_ERR(info->base); 530 531 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); 532 if (IS_ERR(info->rtc_clk)) { 533 dev_err(&pdev->dev, "failed to find rtc clock\n"); 534 return PTR_ERR(info->rtc_clk); 535 } 536 clk_prepare_enable(info->rtc_clk); 537 538 if (info->data->needs_src_clk) { 539 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); 540 if (IS_ERR(info->rtc_src_clk)) { 541 dev_err(&pdev->dev, 542 "failed to find rtc source clock\n"); 543 return PTR_ERR(info->rtc_src_clk); 544 } 545 clk_prepare_enable(info->rtc_src_clk); 546 } 547 548 /* check to see if everything is setup correctly */ 549 if (info->data->enable) 550 info->data->enable(info); 551 552 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", 553 readw(info->base + S3C2410_RTCCON)); 554 555 device_init_wakeup(&pdev->dev, 1); 556 557 /* register RTC and exit */ 558 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, 559 THIS_MODULE); 560 if (IS_ERR(info->rtc)) { 561 dev_err(&pdev->dev, "cannot attach rtc\n"); 562 ret = PTR_ERR(info->rtc); 563 goto err_nortc; 564 } 565 566 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, 567 0, "s3c2410-rtc alarm", info); 568 if (ret) { 569 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); 570 goto err_nortc; 571 } 572 573 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, 574 0, "s3c2410-rtc tick", info); 575 if (ret) { 576 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); 577 goto err_nortc; 578 } 579 580 /* Check RTC Time */ 581 s3c_rtc_gettime(&pdev->dev, &rtc_tm); 582 583 if (rtc_valid_tm(&rtc_tm)) { 584 rtc_tm.tm_year = 100; 585 rtc_tm.tm_mon = 0; 586 rtc_tm.tm_mday = 1; 587 rtc_tm.tm_hour = 0; 588 rtc_tm.tm_min = 0; 589 rtc_tm.tm_sec = 0; 590 591 s3c_rtc_settime(&pdev->dev, &rtc_tm); 592 593 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); 594 } 595 596 if (info->data->select_tick_clk) 597 info->data->select_tick_clk(info); 598 599 s3c_rtc_setfreq(info, 1); 600 601 if (info->data->needs_src_clk) 602 clk_disable(info->rtc_src_clk); 603 clk_disable(info->rtc_clk); 604 605 return 0; 606 607 err_nortc: 608 if (info->data->disable) 609 info->data->disable(info); 610 clk_disable_unprepare(info->rtc_clk); 611 612 return ret; 613} 614 615#ifdef CONFIG_PM_SLEEP 616 617static int s3c_rtc_suspend(struct device *dev) 618{ 619 struct s3c_rtc *info = dev_get_drvdata(dev); 620 621 clk_enable(info->rtc_clk); 622 if (info->data->needs_src_clk) 623 clk_enable(info->rtc_src_clk); 624 625 /* save TICNT for anyone using periodic interrupts */ 626 if (info->data->save_tick_cnt) 627 info->data->save_tick_cnt(info); 628 629 if (info->data->disable) 630 info->data->disable(info); 631 632 if (device_may_wakeup(dev) && !info->wake_en) { 633 if (enable_irq_wake(info->irq_alarm) == 0) 634 info->wake_en = true; 635 else 636 dev_err(dev, "enable_irq_wake failed\n"); 637 } 638 639 if (info->data->needs_src_clk) 640 clk_disable(info->rtc_src_clk); 641 clk_disable(info->rtc_clk); 642 643 return 0; 644} 645 646static int s3c_rtc_resume(struct device *dev) 647{ 648 struct s3c_rtc *info = dev_get_drvdata(dev); 649 650 clk_enable(info->rtc_clk); 651 if (info->data->needs_src_clk) 652 clk_enable(info->rtc_src_clk); 653 654 if (info->data->enable) 655 info->data->enable(info); 656 657 if (info->data->restore_tick_cnt) 658 info->data->restore_tick_cnt(info); 659 660 if (device_may_wakeup(dev) && info->wake_en) { 661 disable_irq_wake(info->irq_alarm); 662 info->wake_en = false; 663 } 664 665 if (info->data->needs_src_clk) 666 clk_disable(info->rtc_src_clk); 667 clk_disable(info->rtc_clk); 668 669 return 0; 670} 671#endif 672static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); 673 674static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) 675{ 676 clk_enable(info->rtc_clk); 677 if (info->data->needs_src_clk) 678 clk_enable(info->rtc_src_clk); 679 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 680 if (info->data->needs_src_clk) 681 clk_disable(info->rtc_src_clk); 682 clk_disable(info->rtc_clk); 683 684 s3c_rtc_alarm_clk_enable(info, false); 685} 686 687static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) 688{ 689 clk_enable(info->rtc_clk); 690 if (info->data->needs_src_clk) 691 clk_enable(info->rtc_src_clk); 692 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 693 writeb(mask, info->base + S3C2410_INTP); 694 if (info->data->needs_src_clk) 695 clk_disable(info->rtc_src_clk); 696 clk_disable(info->rtc_clk); 697 698 s3c_rtc_alarm_clk_enable(info, false); 699} 700 701static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) 702{ 703 unsigned int tmp = 0; 704 int val; 705 706 tmp = readb(info->base + S3C2410_TICNT); 707 tmp &= S3C2410_TICNT_ENABLE; 708 709 val = (info->rtc->max_user_freq / freq) - 1; 710 tmp |= val; 711 712 writel(tmp, info->base + S3C2410_TICNT); 713} 714 715static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) 716{ 717 unsigned int tmp = 0; 718 int val; 719 720 tmp = readb(info->base + S3C2410_TICNT); 721 tmp &= S3C2410_TICNT_ENABLE; 722 723 val = (info->rtc->max_user_freq / freq) - 1; 724 725 tmp |= S3C2443_TICNT_PART(val); 726 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 727 728 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); 729 730 writel(tmp, info->base + S3C2410_TICNT); 731} 732 733static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) 734{ 735 unsigned int tmp = 0; 736 int val; 737 738 tmp = readb(info->base + S3C2410_TICNT); 739 tmp &= S3C2410_TICNT_ENABLE; 740 741 val = (info->rtc->max_user_freq / freq) - 1; 742 743 tmp |= S3C2443_TICNT_PART(val); 744 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 745 746 writel(tmp, info->base + S3C2410_TICNT); 747} 748 749static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) 750{ 751 int val; 752 753 val = (info->rtc->max_user_freq / freq) - 1; 754 writel(val, info->base + S3C2410_TICNT); 755} 756 757static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 758{ 759 unsigned int ticnt; 760 761 ticnt = readb(info->base + S3C2410_TICNT); 762 ticnt &= S3C2410_TICNT_ENABLE; 763 764 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 765} 766 767static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) 768{ 769 unsigned int con; 770 771 con = readw(info->base + S3C2410_RTCCON); 772 con |= S3C2443_RTCCON_TICSEL; 773 writew(con, info->base + S3C2410_RTCCON); 774} 775 776static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 777{ 778 unsigned int ticnt; 779 780 ticnt = readw(info->base + S3C2410_RTCCON); 781 ticnt &= S3C64XX_RTCCON_TICEN; 782 783 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 784} 785 786static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) 787{ 788 info->ticnt_save = readb(info->base + S3C2410_TICNT); 789} 790 791static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) 792{ 793 writeb(info->ticnt_save, info->base + S3C2410_TICNT); 794} 795 796static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) 797{ 798 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); 799 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; 800 info->ticnt_save = readl(info->base + S3C2410_TICNT); 801} 802 803static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) 804{ 805 unsigned int con; 806 807 writel(info->ticnt_save, info->base + S3C2410_TICNT); 808 if (info->ticnt_en_save) { 809 con = readw(info->base + S3C2410_RTCCON); 810 writew(con | info->ticnt_en_save, 811 info->base + S3C2410_RTCCON); 812 } 813} 814 815static struct s3c_rtc_data const s3c2410_rtc_data = { 816 .max_user_freq = 128, 817 .irq_handler = s3c24xx_rtc_irq, 818 .set_freq = s3c2410_rtc_setfreq, 819 .enable_tick = s3c24xx_rtc_enable_tick, 820 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 821 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 822 .enable = s3c24xx_rtc_enable, 823 .disable = s3c24xx_rtc_disable, 824}; 825 826static struct s3c_rtc_data const s3c2416_rtc_data = { 827 .max_user_freq = 32768, 828 .irq_handler = s3c24xx_rtc_irq, 829 .set_freq = s3c2416_rtc_setfreq, 830 .enable_tick = s3c24xx_rtc_enable_tick, 831 .select_tick_clk = s3c2416_rtc_select_tick_clk, 832 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 833 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 834 .enable = s3c24xx_rtc_enable, 835 .disable = s3c24xx_rtc_disable, 836}; 837 838static struct s3c_rtc_data const s3c2443_rtc_data = { 839 .max_user_freq = 32768, 840 .irq_handler = s3c24xx_rtc_irq, 841 .set_freq = s3c2443_rtc_setfreq, 842 .enable_tick = s3c24xx_rtc_enable_tick, 843 .select_tick_clk = s3c2416_rtc_select_tick_clk, 844 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 845 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 846 .enable = s3c24xx_rtc_enable, 847 .disable = s3c24xx_rtc_disable, 848}; 849 850static struct s3c_rtc_data const s3c6410_rtc_data = { 851 .max_user_freq = 32768, 852 .irq_handler = s3c6410_rtc_irq, 853 .set_freq = s3c6410_rtc_setfreq, 854 .enable_tick = s3c6410_rtc_enable_tick, 855 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 856 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 857 .enable = s3c24xx_rtc_enable, 858 .disable = s3c6410_rtc_disable, 859}; 860 861static struct s3c_rtc_data const exynos3250_rtc_data = { 862 .max_user_freq = 32768, 863 .needs_src_clk = true, 864 .irq_handler = s3c6410_rtc_irq, 865 .set_freq = s3c6410_rtc_setfreq, 866 .enable_tick = s3c6410_rtc_enable_tick, 867 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 868 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 869 .enable = s3c24xx_rtc_enable, 870 .disable = s3c6410_rtc_disable, 871}; 872 873static const struct of_device_id s3c_rtc_dt_match[] = { 874 { 875 .compatible = "samsung,s3c2410-rtc", 876 .data = (void *)&s3c2410_rtc_data, 877 }, { 878 .compatible = "samsung,s3c2416-rtc", 879 .data = (void *)&s3c2416_rtc_data, 880 }, { 881 .compatible = "samsung,s3c2443-rtc", 882 .data = (void *)&s3c2443_rtc_data, 883 }, { 884 .compatible = "samsung,s3c6410-rtc", 885 .data = (void *)&s3c6410_rtc_data, 886 }, { 887 .compatible = "samsung,exynos3250-rtc", 888 .data = (void *)&exynos3250_rtc_data, 889 }, 890 { /* sentinel */ }, 891}; 892MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); 893 894static struct platform_driver s3c_rtc_driver = { 895 .probe = s3c_rtc_probe, 896 .remove = s3c_rtc_remove, 897 .driver = { 898 .name = "s3c-rtc", 899 .owner = THIS_MODULE, 900 .pm = &s3c_rtc_pm_ops, 901 .of_match_table = of_match_ptr(s3c_rtc_dt_match), 902 }, 903}; 904module_platform_driver(s3c_rtc_driver); 905 906MODULE_DESCRIPTION("Samsung S3C RTC Driver"); 907MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 908MODULE_LICENSE("GPL"); 909MODULE_ALIAS("platform:s3c2410-rtc"); 910