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 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 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_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 */ 94 static 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 } 103 104 static 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 */ 115 static 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 */ 141 static 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 */ 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 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 } 211 212 static 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 } 245 246 static 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 } 313 314 static 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 } 359 360 static 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 } 377 378 static 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 }; 386 387 static 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 } 425 426 static 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 } 446 447 static 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 } 464 465 static 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 } 476 477 static const struct of_device_id s3c_rtc_dt_match[]; 478 479 static 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 } 486 487 static 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 info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); 539 if (IS_ERR(info->rtc_src_clk)) { 540 dev_err(&pdev->dev, "failed to find rtc source clock\n"); 541 return PTR_ERR(info->rtc_src_clk); 542 } 543 clk_prepare_enable(info->rtc_src_clk); 544 545 546 /* check to see if everything is setup correctly */ 547 if (info->data->enable) 548 info->data->enable(info); 549 550 dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", 551 readw(info->base + S3C2410_RTCCON)); 552 553 device_init_wakeup(&pdev->dev, 1); 554 555 /* register RTC and exit */ 556 info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, 557 THIS_MODULE); 558 if (IS_ERR(info->rtc)) { 559 dev_err(&pdev->dev, "cannot attach rtc\n"); 560 ret = PTR_ERR(info->rtc); 561 goto err_nortc; 562 } 563 564 ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, 565 0, "s3c2410-rtc alarm", info); 566 if (ret) { 567 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); 568 goto err_nortc; 569 } 570 571 ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, 572 0, "s3c2410-rtc tick", info); 573 if (ret) { 574 dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); 575 goto err_nortc; 576 } 577 578 /* Check RTC Time */ 579 s3c_rtc_gettime(&pdev->dev, &rtc_tm); 580 581 if (rtc_valid_tm(&rtc_tm)) { 582 rtc_tm.tm_year = 100; 583 rtc_tm.tm_mon = 0; 584 rtc_tm.tm_mday = 1; 585 rtc_tm.tm_hour = 0; 586 rtc_tm.tm_min = 0; 587 rtc_tm.tm_sec = 0; 588 589 s3c_rtc_settime(&pdev->dev, &rtc_tm); 590 591 dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); 592 } 593 594 if (info->data->select_tick_clk) 595 info->data->select_tick_clk(info); 596 597 s3c_rtc_setfreq(info, 1); 598 599 if (info->data->needs_src_clk) 600 clk_disable(info->rtc_src_clk); 601 clk_disable(info->rtc_clk); 602 603 return 0; 604 605 err_nortc: 606 if (info->data->disable) 607 info->data->disable(info); 608 clk_disable_unprepare(info->rtc_clk); 609 610 return ret; 611 } 612 613 #ifdef CONFIG_PM_SLEEP 614 615 static int s3c_rtc_suspend(struct device *dev) 616 { 617 struct s3c_rtc *info = dev_get_drvdata(dev); 618 619 clk_enable(info->rtc_clk); 620 if (info->data->needs_src_clk) 621 clk_enable(info->rtc_src_clk); 622 623 /* save TICNT for anyone using periodic interrupts */ 624 if (info->data->save_tick_cnt) 625 info->data->save_tick_cnt(info); 626 627 if (info->data->disable) 628 info->data->disable(info); 629 630 if (device_may_wakeup(dev) && !info->wake_en) { 631 if (enable_irq_wake(info->irq_alarm) == 0) 632 info->wake_en = true; 633 else 634 dev_err(dev, "enable_irq_wake failed\n"); 635 } 636 637 if (info->data->needs_src_clk) 638 clk_disable(info->rtc_src_clk); 639 clk_disable(info->rtc_clk); 640 641 return 0; 642 } 643 644 static int s3c_rtc_resume(struct device *dev) 645 { 646 struct s3c_rtc *info = dev_get_drvdata(dev); 647 648 clk_enable(info->rtc_clk); 649 if (info->data->needs_src_clk) 650 clk_enable(info->rtc_src_clk); 651 652 if (info->data->enable) 653 info->data->enable(info); 654 655 if (info->data->restore_tick_cnt) 656 info->data->restore_tick_cnt(info); 657 658 if (device_may_wakeup(dev) && info->wake_en) { 659 disable_irq_wake(info->irq_alarm); 660 info->wake_en = false; 661 } 662 663 if (info->data->needs_src_clk) 664 clk_disable(info->rtc_src_clk); 665 clk_disable(info->rtc_clk); 666 667 return 0; 668 } 669 #endif 670 static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); 671 672 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) 673 { 674 clk_enable(info->rtc_clk); 675 if (info->data->needs_src_clk) 676 clk_enable(info->rtc_src_clk); 677 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 678 if (info->data->needs_src_clk) 679 clk_disable(info->rtc_src_clk); 680 clk_disable(info->rtc_clk); 681 682 s3c_rtc_alarm_clk_enable(info, false); 683 } 684 685 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) 686 { 687 clk_enable(info->rtc_clk); 688 if (info->data->needs_src_clk) 689 clk_enable(info->rtc_src_clk); 690 rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); 691 writeb(mask, info->base + S3C2410_INTP); 692 if (info->data->needs_src_clk) 693 clk_disable(info->rtc_src_clk); 694 clk_disable(info->rtc_clk); 695 696 s3c_rtc_alarm_clk_enable(info, false); 697 } 698 699 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) 700 { 701 unsigned int tmp = 0; 702 int val; 703 704 tmp = readb(info->base + S3C2410_TICNT); 705 tmp &= S3C2410_TICNT_ENABLE; 706 707 val = (info->rtc->max_user_freq / freq) - 1; 708 tmp |= val; 709 710 writel(tmp, info->base + S3C2410_TICNT); 711 } 712 713 static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) 714 { 715 unsigned int tmp = 0; 716 int val; 717 718 tmp = readb(info->base + S3C2410_TICNT); 719 tmp &= S3C2410_TICNT_ENABLE; 720 721 val = (info->rtc->max_user_freq / freq) - 1; 722 723 tmp |= S3C2443_TICNT_PART(val); 724 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 725 726 writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); 727 728 writel(tmp, info->base + S3C2410_TICNT); 729 } 730 731 static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) 732 { 733 unsigned int tmp = 0; 734 int val; 735 736 tmp = readb(info->base + S3C2410_TICNT); 737 tmp &= S3C2410_TICNT_ENABLE; 738 739 val = (info->rtc->max_user_freq / freq) - 1; 740 741 tmp |= S3C2443_TICNT_PART(val); 742 writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); 743 744 writel(tmp, info->base + S3C2410_TICNT); 745 } 746 747 static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) 748 { 749 int val; 750 751 val = (info->rtc->max_user_freq / freq) - 1; 752 writel(val, info->base + S3C2410_TICNT); 753 } 754 755 static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 756 { 757 unsigned int ticnt; 758 759 ticnt = readb(info->base + S3C2410_TICNT); 760 ticnt &= S3C2410_TICNT_ENABLE; 761 762 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 763 } 764 765 static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) 766 { 767 unsigned int con; 768 769 con = readw(info->base + S3C2410_RTCCON); 770 con |= S3C2443_RTCCON_TICSEL; 771 writew(con, info->base + S3C2410_RTCCON); 772 } 773 774 static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) 775 { 776 unsigned int ticnt; 777 778 ticnt = readw(info->base + S3C2410_RTCCON); 779 ticnt &= S3C64XX_RTCCON_TICEN; 780 781 seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); 782 } 783 784 static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) 785 { 786 info->ticnt_save = readb(info->base + S3C2410_TICNT); 787 } 788 789 static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) 790 { 791 writeb(info->ticnt_save, info->base + S3C2410_TICNT); 792 } 793 794 static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) 795 { 796 info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); 797 info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; 798 info->ticnt_save = readl(info->base + S3C2410_TICNT); 799 } 800 801 static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) 802 { 803 unsigned int con; 804 805 writel(info->ticnt_save, info->base + S3C2410_TICNT); 806 if (info->ticnt_en_save) { 807 con = readw(info->base + S3C2410_RTCCON); 808 writew(con | info->ticnt_en_save, 809 info->base + S3C2410_RTCCON); 810 } 811 } 812 813 static struct s3c_rtc_data const s3c2410_rtc_data = { 814 .max_user_freq = 128, 815 .irq_handler = s3c24xx_rtc_irq, 816 .set_freq = s3c2410_rtc_setfreq, 817 .enable_tick = s3c24xx_rtc_enable_tick, 818 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 819 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 820 .enable = s3c24xx_rtc_enable, 821 .disable = s3c24xx_rtc_disable, 822 }; 823 824 static struct s3c_rtc_data const s3c2416_rtc_data = { 825 .max_user_freq = 32768, 826 .irq_handler = s3c24xx_rtc_irq, 827 .set_freq = s3c2416_rtc_setfreq, 828 .enable_tick = s3c24xx_rtc_enable_tick, 829 .select_tick_clk = s3c2416_rtc_select_tick_clk, 830 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 831 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 832 .enable = s3c24xx_rtc_enable, 833 .disable = s3c24xx_rtc_disable, 834 }; 835 836 static struct s3c_rtc_data const s3c2443_rtc_data = { 837 .max_user_freq = 32768, 838 .irq_handler = s3c24xx_rtc_irq, 839 .set_freq = s3c2443_rtc_setfreq, 840 .enable_tick = s3c24xx_rtc_enable_tick, 841 .select_tick_clk = s3c2416_rtc_select_tick_clk, 842 .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, 843 .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, 844 .enable = s3c24xx_rtc_enable, 845 .disable = s3c24xx_rtc_disable, 846 }; 847 848 static struct s3c_rtc_data const s3c6410_rtc_data = { 849 .max_user_freq = 32768, 850 .irq_handler = s3c6410_rtc_irq, 851 .set_freq = s3c6410_rtc_setfreq, 852 .enable_tick = s3c6410_rtc_enable_tick, 853 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 854 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 855 .enable = s3c24xx_rtc_enable, 856 .disable = s3c6410_rtc_disable, 857 }; 858 859 static struct s3c_rtc_data const exynos3250_rtc_data = { 860 .max_user_freq = 32768, 861 .needs_src_clk = true, 862 .irq_handler = s3c6410_rtc_irq, 863 .set_freq = s3c6410_rtc_setfreq, 864 .enable_tick = s3c6410_rtc_enable_tick, 865 .save_tick_cnt = s3c6410_rtc_save_tick_cnt, 866 .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, 867 .enable = s3c24xx_rtc_enable, 868 .disable = s3c6410_rtc_disable, 869 }; 870 871 static const struct of_device_id s3c_rtc_dt_match[] = { 872 { 873 .compatible = "samsung,s3c2410-rtc", 874 .data = (void *)&s3c2410_rtc_data, 875 }, { 876 .compatible = "samsung,s3c2416-rtc", 877 .data = (void *)&s3c2416_rtc_data, 878 }, { 879 .compatible = "samsung,s3c2443-rtc", 880 .data = (void *)&s3c2443_rtc_data, 881 }, { 882 .compatible = "samsung,s3c6410-rtc", 883 .data = (void *)&s3c6410_rtc_data, 884 }, { 885 .compatible = "samsung,exynos3250-rtc", 886 .data = (void *)&exynos3250_rtc_data, 887 }, 888 { /* sentinel */ }, 889 }; 890 MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); 891 892 static struct platform_driver s3c_rtc_driver = { 893 .probe = s3c_rtc_probe, 894 .remove = s3c_rtc_remove, 895 .driver = { 896 .name = "s3c-rtc", 897 .owner = THIS_MODULE, 898 .pm = &s3c_rtc_pm_ops, 899 .of_match_table = of_match_ptr(s3c_rtc_dt_match), 900 }, 901 }; 902 module_platform_driver(s3c_rtc_driver); 903 904 MODULE_DESCRIPTION("Samsung S3C RTC Driver"); 905 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); 906 MODULE_LICENSE("GPL"); 907 MODULE_ALIAS("platform:s3c2410-rtc"); 908