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 int year = tm->tm_year - 100; 306 307 dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n", 308 alrm->enabled, 309 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, 310 tm->tm_hour, tm->tm_min, tm->tm_sec); 311 312 s3c_rtc_enable_clk(info); 313 314 alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; 315 writeb(0x00, info->base + S3C2410_RTCALM); 316 317 if (tm->tm_sec < 60 && tm->tm_sec >= 0) { 318 alrm_en |= S3C2410_RTCALM_SECEN; 319 writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC); 320 } 321 322 if (tm->tm_min < 60 && tm->tm_min >= 0) { 323 alrm_en |= S3C2410_RTCALM_MINEN; 324 writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN); 325 } 326 327 if (tm->tm_hour < 24 && tm->tm_hour >= 0) { 328 alrm_en |= S3C2410_RTCALM_HOUREN; 329 writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR); 330 } 331 332 if (year < 100 && year >= 0) { 333 alrm_en |= S3C2410_RTCALM_YEAREN; 334 writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR); 335 } 336 337 if (tm->tm_mon < 12 && tm->tm_mon >= 0) { 338 alrm_en |= S3C2410_RTCALM_MONEN; 339 writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON); 340 } 341 342 if (tm->tm_mday <= 31 && tm->tm_mday >= 1) { 343 alrm_en |= S3C2410_RTCALM_DAYEN; 344 writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE); 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_disable_clk(info); 352 353 s3c_rtc_setaie(dev, alrm->enabled); 354 355 return 0; 356 } 357 358 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) 359 { 360 struct s3c_rtc *info = dev_get_drvdata(dev); 361 362 s3c_rtc_enable_clk(info); 363 364 if (info->data->enable_tick) 365 info->data->enable_tick(info, seq); 366 367 s3c_rtc_disable_clk(info); 368 369 return 0; 370 } 371 372 static const struct rtc_class_ops s3c_rtcops = { 373 .read_time = s3c_rtc_gettime, 374 .set_time = s3c_rtc_settime, 375 .read_alarm = s3c_rtc_getalarm, 376 .set_alarm = s3c_rtc_setalarm, 377 .proc = s3c_rtc_proc, 378 .alarm_irq_enable = s3c_rtc_setaie, 379 }; 380 381 static void s3c24xx_rtc_enable(struct s3c_rtc *info) 382 { 383 unsigned int con, tmp; 384 385 con = readw(info->base + S3C2410_RTCCON); 386 /* re-enable the device, and check it is ok */ 387 if ((con & S3C2410_RTCCON_RTCEN) == 0) { 388 dev_info(info->dev, "rtc disabled, re-enabling\n"); 389 390 tmp = readw(info->base + S3C2410_RTCCON); 391 writew(tmp | S3C2410_RTCCON_RTCEN, 392 info->base + S3C2410_RTCCON); 393 } 394 395 if (con & S3C2410_RTCCON_CNTSEL) { 396 dev_info(info->dev, "removing RTCCON_CNTSEL\n"); 397 398 tmp = readw(info->base + S3C2410_RTCCON); 399 writew(tmp & ~S3C2410_RTCCON_CNTSEL, 400 info->base + S3C2410_RTCCON); 401 } 402 403 if (con & S3C2410_RTCCON_CLKRST) { 404 dev_info(info->dev, "removing RTCCON_CLKRST\n"); 405 406 tmp = readw(info->base + S3C2410_RTCCON); 407 writew(tmp & ~S3C2410_RTCCON_CLKRST, 408 info->base + S3C2410_RTCCON); 409 } 410 } 411 412 static void s3c24xx_rtc_disable(struct s3c_rtc *info) 413 { 414 unsigned int con; 415 416 con = readw(info->base + S3C2410_RTCCON); 417 con &= ~S3C2410_RTCCON_RTCEN; 418 writew(con, info->base + S3C2410_RTCCON); 419 420 con = readb(info->base + S3C2410_TICNT); 421 con &= ~S3C2410_TICNT_ENABLE; 422 writeb(con, info->base + S3C2410_TICNT); 423 } 424 425 static void s3c6410_rtc_disable(struct s3c_rtc *info) 426 { 427 unsigned int con; 428 429 con = readw(info->base + S3C2410_RTCCON); 430 con &= ~S3C64XX_RTCCON_TICEN; 431 con &= ~S3C2410_RTCCON_RTCEN; 432 writew(con, info->base + S3C2410_RTCCON); 433 } 434 435 static int s3c_rtc_remove(struct platform_device *pdev) 436 { 437 struct s3c_rtc *info = platform_get_drvdata(pdev); 438 439 s3c_rtc_setaie(info->dev, 0); 440 441 if (info->data->needs_src_clk) 442 clk_unprepare(info->rtc_src_clk); 443 clk_unprepare(info->rtc_clk); 444 445 return 0; 446 } 447 448 static const struct of_device_id s3c_rtc_dt_match[]; 449 450 static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev) 451 { 452 const struct of_device_id *match; 453 454 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node); 455 return (struct s3c_rtc_data *)match->data; 456 } 457 458 static int s3c_rtc_probe(struct platform_device *pdev) 459 { 460 struct s3c_rtc *info = NULL; 461 struct rtc_time rtc_tm; 462 struct resource *res; 463 int ret; 464 465 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 466 if (!info) 467 return -ENOMEM; 468 469 /* find the IRQs */ 470 info->irq_tick = platform_get_irq(pdev, 1); 471 if (info->irq_tick < 0) { 472 dev_err(&pdev->dev, "no irq for rtc tick\n"); 473 return info->irq_tick; 474 } 475 476 info->dev = &pdev->dev; 477 info->data = s3c_rtc_get_data(pdev); 478 if (!info->data) { 479 dev_err(&pdev->dev, "failed getting s3c_rtc_data\n"); 480 return -EINVAL; 481 } 482 spin_lock_init(&info->pie_lock); 483 spin_lock_init(&info->alarm_clk_lock); 484 485 platform_set_drvdata(pdev, info); 486 487 info->irq_alarm = platform_get_irq(pdev, 0); 488 if (info->irq_alarm < 0) { 489 dev_err(&pdev->dev, "no irq for alarm\n"); 490 return info->irq_alarm; 491 } 492 493 dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n", 494 info->irq_tick, info->irq_alarm); 495 496 /* get the memory region */ 497 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 498 info->base = devm_ioremap_resource(&pdev->dev, res); 499 if (IS_ERR(info->base)) 500 return PTR_ERR(info->base); 501 502 info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); 503 if (IS_ERR(info->rtc_clk)) { 504 dev_err(&pdev->dev, "failed to find rtc clock\n"); 505 return PTR_ERR(info->rtc_clk); 506 } 507 clk_prepare_enable(info->rtc_clk); 508 509 if (info->data->needs_src_clk) { 510 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); 511 if (IS_ERR(info->rtc_src_clk)) { 512 dev_err(&pdev->dev, 513 "failed to find rtc source clock\n"); 514 clk_disable_unprepare(info->rtc_clk); 515 return PTR_ERR(info->rtc_src_clk); 516 } 517 clk_prepare_enable(info->rtc_src_clk); 518 } 519 520 /* check to see if everything is setup correctly */ 521 if (info->data->enable) 522 info->data->enable(info); 523 524 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", 525 readw(info->base + S3C2410_RTCCON)); 526 527 device_init_wakeup(&pdev->dev, 1); 528 529 /* Check RTC Time */ 530 if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) { 531 rtc_tm.tm_year = 100; 532 rtc_tm.tm_mon = 0; 533 rtc_tm.tm_mday = 1; 534 rtc_tm.tm_hour = 0; 535 rtc_tm.tm_min = 0; 536 rtc_tm.tm_sec = 0; 537 538 s3c_rtc_settime(&pdev->dev, &rtc_tm); 539 540 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); 541 } 542 543 /* register RTC and exit */ 544 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, 545 THIS_MODULE); 546 if (IS_ERR(info->rtc)) { 547 dev_err(&pdev->dev, "cannot attach rtc\n"); 548 ret = PTR_ERR(info->rtc); 549 goto err_nortc; 550 } 551 552 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, 553 0, "s3c2410-rtc alarm", info); 554 if (ret) { 555 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); 556 goto err_nortc; 557 } 558 559 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, 560 0, "s3c2410-rtc tick", info); 561 if (ret) { 562 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); 563 goto err_nortc; 564 } 565 566 if (info->data->select_tick_clk) 567 info->data->select_tick_clk(info); 568 569 s3c_rtc_setfreq(info, 1); 570 571 s3c_rtc_disable_clk(info); 572 573 return 0; 574 575 err_nortc: 576 if (info->data->disable) 577 info->data->disable(info); 578 579 if (info->data->needs_src_clk) 580 clk_disable_unprepare(info->rtc_src_clk); 581 clk_disable_unprepare(info->rtc_clk); 582 583 return ret; 584 } 585 586 #ifdef CONFIG_PM_SLEEP 587 588 static int s3c_rtc_suspend(struct device *dev) 589 { 590 struct s3c_rtc *info = dev_get_drvdata(dev); 591 592 s3c_rtc_enable_clk(info); 593 594 /* save TICNT for anyone using periodic interrupts */ 595 if (info->data->save_tick_cnt) 596 info->data->save_tick_cnt(info); 597 598 if (info->data->disable) 599 info->data->disable(info); 600 601 if (device_may_wakeup(dev) && !info->wake_en) { 602 if (enable_irq_wake(info->irq_alarm) == 0) 603 info->wake_en = true; 604 else 605 dev_err(dev, "enable_irq_wake failed\n"); 606 } 607 608 return 0; 609 } 610 611 static int s3c_rtc_resume(struct device *dev) 612 { 613 struct s3c_rtc *info = dev_get_drvdata(dev); 614 615 if (info->data->enable) 616 info->data->enable(info); 617 618 if (info->data->restore_tick_cnt) 619 info->data->restore_tick_cnt(info); 620 621 s3c_rtc_disable_clk(info); 622 623 if (device_may_wakeup(dev) && info->wake_en) { 624 disable_irq_wake(info->irq_alarm); 625 info->wake_en = false; 626 } 627 628 return 0; 629 } 630 #endif 631 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); 632 633 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) 634 { 635 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 636 } 637 638 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) 639 { 640 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 641 writeb(mask, info->base + S3C2410_INTP); 642 } 643 644 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) 645 { 646 unsigned int tmp = 0; 647 int val; 648 649 tmp = readb(info->base + S3C2410_TICNT); 650 tmp &= S3C2410_TICNT_ENABLE; 651 652 val = (info->rtc->max_user_freq / freq) - 1; 653 tmp |= val; 654 655 writel(tmp, info->base + S3C2410_TICNT); 656 } 657 658 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) 659 { 660 unsigned int tmp = 0; 661 int val; 662 663 tmp = readb(info->base + S3C2410_TICNT); 664 tmp &= S3C2410_TICNT_ENABLE; 665 666 val = (info->rtc->max_user_freq / freq) - 1; 667 668 tmp |= S3C2443_TICNT_PART(val); 669 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 670 671 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); 672 673 writel(tmp, info->base + S3C2410_TICNT); 674 } 675 676 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) 677 { 678 unsigned int tmp = 0; 679 int val; 680 681 tmp = readb(info->base + S3C2410_TICNT); 682 tmp &= S3C2410_TICNT_ENABLE; 683 684 val = (info->rtc->max_user_freq / freq) - 1; 685 686 tmp |= S3C2443_TICNT_PART(val); 687 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 688 689 writel(tmp, info->base + S3C2410_TICNT); 690 } 691 692 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) 693 { 694 int val; 695 696 val = (info->rtc->max_user_freq / freq) - 1; 697 writel(val, info->base + S3C2410_TICNT); 698 } 699 700 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 701 { 702 unsigned int ticnt; 703 704 ticnt = readb(info->base + S3C2410_TICNT); 705 ticnt &= S3C2410_TICNT_ENABLE; 706 707 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 708 } 709 710 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) 711 { 712 unsigned int con; 713 714 con = readw(info->base + S3C2410_RTCCON); 715 con |= S3C2443_RTCCON_TICSEL; 716 writew(con, info->base + S3C2410_RTCCON); 717 } 718 719 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 720 { 721 unsigned int ticnt; 722 723 ticnt = readw(info->base + S3C2410_RTCCON); 724 ticnt &= S3C64XX_RTCCON_TICEN; 725 726 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 727 } 728 729 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) 730 { 731 info->ticnt_save = readb(info->base + S3C2410_TICNT); 732 } 733 734 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) 735 { 736 writeb(info->ticnt_save, info->base + S3C2410_TICNT); 737 } 738 739 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) 740 { 741 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); 742 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; 743 info->ticnt_save = readl(info->base + S3C2410_TICNT); 744 } 745 746 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) 747 { 748 unsigned int con; 749 750 writel(info->ticnt_save, info->base + S3C2410_TICNT); 751 if (info->ticnt_en_save) { 752 con = readw(info->base + S3C2410_RTCCON); 753 writew(con | info->ticnt_en_save, 754 info->base + S3C2410_RTCCON); 755 } 756 } 757 758 static struct s3c_rtc_data const s3c2410_rtc_data = { 759 .max_user_freq = 128, 760 .irq_handler = s3c24xx_rtc_irq, 761 .set_freq = s3c2410_rtc_setfreq, 762 .enable_tick = s3c24xx_rtc_enable_tick, 763 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 764 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 765 .enable = s3c24xx_rtc_enable, 766 .disable = s3c24xx_rtc_disable, 767 }; 768 769 static struct s3c_rtc_data const s3c2416_rtc_data = { 770 .max_user_freq = 32768, 771 .irq_handler = s3c24xx_rtc_irq, 772 .set_freq = s3c2416_rtc_setfreq, 773 .enable_tick = s3c24xx_rtc_enable_tick, 774 .select_tick_clk = s3c2416_rtc_select_tick_clk, 775 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 776 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 777 .enable = s3c24xx_rtc_enable, 778 .disable = s3c24xx_rtc_disable, 779 }; 780 781 static struct s3c_rtc_data const s3c2443_rtc_data = { 782 .max_user_freq = 32768, 783 .irq_handler = s3c24xx_rtc_irq, 784 .set_freq = s3c2443_rtc_setfreq, 785 .enable_tick = s3c24xx_rtc_enable_tick, 786 .select_tick_clk = s3c2416_rtc_select_tick_clk, 787 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 788 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 789 .enable = s3c24xx_rtc_enable, 790 .disable = s3c24xx_rtc_disable, 791 }; 792 793 static struct s3c_rtc_data const s3c6410_rtc_data = { 794 .max_user_freq = 32768, 795 .needs_src_clk = true, 796 .irq_handler = s3c6410_rtc_irq, 797 .set_freq = s3c6410_rtc_setfreq, 798 .enable_tick = s3c6410_rtc_enable_tick, 799 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 800 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 801 .enable = s3c24xx_rtc_enable, 802 .disable = s3c6410_rtc_disable, 803 }; 804 805 static const struct of_device_id s3c_rtc_dt_match[] = { 806 { 807 .compatible = "samsung,s3c2410-rtc", 808 .data = (void *)&s3c2410_rtc_data, 809 }, { 810 .compatible = "samsung,s3c2416-rtc", 811 .data = (void *)&s3c2416_rtc_data, 812 }, { 813 .compatible = "samsung,s3c2443-rtc", 814 .data = (void *)&s3c2443_rtc_data, 815 }, { 816 .compatible = "samsung,s3c6410-rtc", 817 .data = (void *)&s3c6410_rtc_data, 818 }, { 819 .compatible = "samsung,exynos3250-rtc", 820 .data = (void *)&s3c6410_rtc_data, 821 }, 822 { /* sentinel */ }, 823 }; 824 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); 825 826 static struct platform_driver s3c_rtc_driver = { 827 .probe = s3c_rtc_probe, 828 .remove = s3c_rtc_remove, 829 .driver = { 830 .name = "s3c-rtc", 831 .pm = &s3c_rtc_pm_ops, 832 .of_match_table = of_match_ptr(s3c_rtc_dt_match), 833 }, 834 }; 835 module_platform_driver(s3c_rtc_driver); 836 837 MODULE_DESCRIPTION("Samsung S3C RTC Driver"); 838 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 839 MODULE_LICENSE("GPL"); 840 MODULE_ALIAS("platform:s3c2410-rtc"); 841