1 /* 2 * SuperH On-Chip RTC Support 3 * 4 * Copyright (C) 2006, 2007, 2008 Paul Mundt 5 * Copyright (C) 2006 Jamie Lenehan 6 * Copyright (C) 2008 Angelo Castello 7 * 8 * Based on the old arch/sh/kernel/cpu/rtc.c by: 9 * 10 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> 11 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka 12 * 13 * This file is subject to the terms and conditions of the GNU General Public 14 * License. See the file "COPYING" in the main directory of this archive 15 * for more details. 16 */ 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/bcd.h> 20 #include <linux/rtc.h> 21 #include <linux/init.h> 22 #include <linux/platform_device.h> 23 #include <linux/seq_file.h> 24 #include <linux/interrupt.h> 25 #include <linux/spinlock.h> 26 #include <linux/io.h> 27 #include <asm/rtc.h> 28 29 #define DRV_NAME "sh-rtc" 30 #define DRV_VERSION "0.2.0" 31 32 #define RTC_REG(r) ((r) * rtc_reg_size) 33 34 #define R64CNT RTC_REG(0) 35 36 #define RSECCNT RTC_REG(1) /* RTC sec */ 37 #define RMINCNT RTC_REG(2) /* RTC min */ 38 #define RHRCNT RTC_REG(3) /* RTC hour */ 39 #define RWKCNT RTC_REG(4) /* RTC week */ 40 #define RDAYCNT RTC_REG(5) /* RTC day */ 41 #define RMONCNT RTC_REG(6) /* RTC month */ 42 #define RYRCNT RTC_REG(7) /* RTC year */ 43 #define RSECAR RTC_REG(8) /* ALARM sec */ 44 #define RMINAR RTC_REG(9) /* ALARM min */ 45 #define RHRAR RTC_REG(10) /* ALARM hour */ 46 #define RWKAR RTC_REG(11) /* ALARM week */ 47 #define RDAYAR RTC_REG(12) /* ALARM day */ 48 #define RMONAR RTC_REG(13) /* ALARM month */ 49 #define RCR1 RTC_REG(14) /* Control */ 50 #define RCR2 RTC_REG(15) /* Control */ 51 52 /* 53 * Note on RYRAR and RCR3: Up until this point most of the register 54 * definitions are consistent across all of the available parts. However, 55 * the placement of the optional RYRAR and RCR3 (the RYRAR control 56 * register used to control RYRCNT/RYRAR compare) varies considerably 57 * across various parts, occasionally being mapped in to a completely 58 * unrelated address space. For proper RYRAR support a separate resource 59 * would have to be handed off, but as this is purely optional in 60 * practice, we simply opt not to support it, thereby keeping the code 61 * quite a bit more simplified. 62 */ 63 64 /* ALARM Bits - or with BCD encoded value */ 65 #define AR_ENB 0x80 /* Enable for alarm cmp */ 66 67 /* Period Bits */ 68 #define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */ 69 #define PF_COUNT 0x200 /* Half periodic counter */ 70 #define PF_OXS 0x400 /* Periodic One x Second */ 71 #define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */ 72 #define PF_MASK 0xf00 73 74 /* RCR1 Bits */ 75 #define RCR1_CF 0x80 /* Carry Flag */ 76 #define RCR1_CIE 0x10 /* Carry Interrupt Enable */ 77 #define RCR1_AIE 0x08 /* Alarm Interrupt Enable */ 78 #define RCR1_AF 0x01 /* Alarm Flag */ 79 80 /* RCR2 Bits */ 81 #define RCR2_PEF 0x80 /* PEriodic interrupt Flag */ 82 #define RCR2_PESMASK 0x70 /* Periodic interrupt Set */ 83 #define RCR2_RTCEN 0x08 /* ENable RTC */ 84 #define RCR2_ADJ 0x04 /* ADJustment (30-second) */ 85 #define RCR2_RESET 0x02 /* Reset bit */ 86 #define RCR2_START 0x01 /* Start bit */ 87 88 struct sh_rtc { 89 void __iomem *regbase; 90 unsigned long regsize; 91 struct resource *res; 92 unsigned int alarm_irq, periodic_irq, carry_irq; 93 struct rtc_device *rtc_dev; 94 spinlock_t lock; 95 unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */ 96 unsigned short periodic_freq; 97 }; 98 99 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id) 100 { 101 struct sh_rtc *rtc = dev_id; 102 unsigned int tmp; 103 104 spin_lock(&rtc->lock); 105 106 tmp = readb(rtc->regbase + RCR1); 107 tmp &= ~RCR1_CF; 108 writeb(tmp, rtc->regbase + RCR1); 109 110 /* Users have requested One x Second IRQ */ 111 if (rtc->periodic_freq & PF_OXS) 112 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF); 113 114 spin_unlock(&rtc->lock); 115 116 return IRQ_HANDLED; 117 } 118 119 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id) 120 { 121 struct sh_rtc *rtc = dev_id; 122 unsigned int tmp; 123 124 spin_lock(&rtc->lock); 125 126 tmp = readb(rtc->regbase + RCR1); 127 tmp &= ~(RCR1_AF | RCR1_AIE); 128 writeb(tmp, rtc->regbase + RCR1); 129 130 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); 131 132 spin_unlock(&rtc->lock); 133 134 return IRQ_HANDLED; 135 } 136 137 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id) 138 { 139 struct sh_rtc *rtc = dev_id; 140 struct rtc_device *rtc_dev = rtc->rtc_dev; 141 unsigned int tmp; 142 143 spin_lock(&rtc->lock); 144 145 tmp = readb(rtc->regbase + RCR2); 146 tmp &= ~RCR2_PEF; 147 writeb(tmp, rtc->regbase + RCR2); 148 149 /* Half period enabled than one skipped and the next notified */ 150 if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT)) 151 rtc->periodic_freq &= ~PF_COUNT; 152 else { 153 if (rtc->periodic_freq & PF_HP) 154 rtc->periodic_freq |= PF_COUNT; 155 if (rtc->periodic_freq & PF_KOU) { 156 spin_lock(&rtc_dev->irq_task_lock); 157 if (rtc_dev->irq_task) 158 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data); 159 spin_unlock(&rtc_dev->irq_task_lock); 160 } else 161 rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF); 162 } 163 164 spin_unlock(&rtc->lock); 165 166 return IRQ_HANDLED; 167 } 168 169 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable) 170 { 171 struct sh_rtc *rtc = dev_get_drvdata(dev); 172 unsigned int tmp; 173 174 spin_lock_irq(&rtc->lock); 175 176 tmp = readb(rtc->regbase + RCR2); 177 178 if (enable) { 179 tmp &= ~RCR2_PEF; /* Clear PES bit */ 180 tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */ 181 } else 182 tmp &= ~(RCR2_PESMASK | RCR2_PEF); 183 184 writeb(tmp, rtc->regbase + RCR2); 185 186 spin_unlock_irq(&rtc->lock); 187 } 188 189 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq) 190 { 191 struct sh_rtc *rtc = dev_get_drvdata(dev); 192 int tmp, ret = 0; 193 194 spin_lock_irq(&rtc->lock); 195 tmp = rtc->periodic_freq & PF_MASK; 196 197 switch (freq) { 198 case 0: 199 rtc->periodic_freq = 0x00; 200 break; 201 case 1: 202 rtc->periodic_freq = 0x60; 203 break; 204 case 2: 205 rtc->periodic_freq = 0x50; 206 break; 207 case 4: 208 rtc->periodic_freq = 0x40; 209 break; 210 case 8: 211 rtc->periodic_freq = 0x30 | PF_HP; 212 break; 213 case 16: 214 rtc->periodic_freq = 0x30; 215 break; 216 case 32: 217 rtc->periodic_freq = 0x20 | PF_HP; 218 break; 219 case 64: 220 rtc->periodic_freq = 0x20; 221 break; 222 case 128: 223 rtc->periodic_freq = 0x10 | PF_HP; 224 break; 225 case 256: 226 rtc->periodic_freq = 0x10; 227 break; 228 default: 229 ret = -ENOTSUPP; 230 } 231 232 if (ret == 0) { 233 rtc->periodic_freq |= tmp; 234 rtc->rtc_dev->irq_freq = freq; 235 } 236 237 spin_unlock_irq(&rtc->lock); 238 return ret; 239 } 240 241 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable) 242 { 243 struct sh_rtc *rtc = dev_get_drvdata(dev); 244 unsigned int tmp; 245 246 spin_lock_irq(&rtc->lock); 247 248 tmp = readb(rtc->regbase + RCR1); 249 250 if (!enable) 251 tmp &= ~RCR1_AIE; 252 else 253 tmp |= RCR1_AIE; 254 255 writeb(tmp, rtc->regbase + RCR1); 256 257 spin_unlock_irq(&rtc->lock); 258 } 259 260 static int sh_rtc_proc(struct device *dev, struct seq_file *seq) 261 { 262 struct sh_rtc *rtc = dev_get_drvdata(dev); 263 unsigned int tmp; 264 265 tmp = readb(rtc->regbase + RCR1); 266 seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no"); 267 268 tmp = readb(rtc->regbase + RCR2); 269 seq_printf(seq, "periodic_IRQ\t: %s\n", 270 (tmp & RCR2_PESMASK) ? "yes" : "no"); 271 272 return 0; 273 } 274 275 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 276 { 277 struct sh_rtc *rtc = dev_get_drvdata(dev); 278 unsigned int ret = 0; 279 280 switch (cmd) { 281 case RTC_PIE_OFF: 282 case RTC_PIE_ON: 283 sh_rtc_setpie(dev, cmd == RTC_PIE_ON); 284 break; 285 case RTC_AIE_OFF: 286 case RTC_AIE_ON: 287 sh_rtc_setaie(dev, cmd == RTC_AIE_ON); 288 break; 289 case RTC_UIE_OFF: 290 rtc->periodic_freq &= ~PF_OXS; 291 break; 292 case RTC_UIE_ON: 293 rtc->periodic_freq |= PF_OXS; 294 break; 295 case RTC_IRQP_READ: 296 ret = put_user(rtc->rtc_dev->irq_freq, 297 (unsigned long __user *)arg); 298 break; 299 case RTC_IRQP_SET: 300 ret = sh_rtc_setfreq(dev, arg); 301 break; 302 default: 303 ret = -ENOIOCTLCMD; 304 } 305 306 return ret; 307 } 308 309 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm) 310 { 311 struct platform_device *pdev = to_platform_device(dev); 312 struct sh_rtc *rtc = platform_get_drvdata(pdev); 313 unsigned int sec128, sec2, yr, yr100, cf_bit; 314 315 do { 316 unsigned int tmp; 317 318 spin_lock_irq(&rtc->lock); 319 320 tmp = readb(rtc->regbase + RCR1); 321 tmp &= ~RCR1_CF; /* Clear CF-bit */ 322 tmp |= RCR1_CIE; 323 writeb(tmp, rtc->regbase + RCR1); 324 325 sec128 = readb(rtc->regbase + R64CNT); 326 327 tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT)); 328 tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT)); 329 tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT)); 330 tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT)); 331 tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT)); 332 tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1; 333 334 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { 335 yr = readw(rtc->regbase + RYRCNT); 336 yr100 = bcd2bin(yr >> 8); 337 yr &= 0xff; 338 } else { 339 yr = readb(rtc->regbase + RYRCNT); 340 yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20); 341 } 342 343 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900; 344 345 sec2 = readb(rtc->regbase + R64CNT); 346 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF; 347 348 spin_unlock_irq(&rtc->lock); 349 } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0); 350 351 #if RTC_BIT_INVERTED != 0 352 if ((sec128 & RTC_BIT_INVERTED)) 353 tm->tm_sec--; 354 #endif 355 356 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 357 "mday=%d, mon=%d, year=%d, wday=%d\n", 358 __func__, 359 tm->tm_sec, tm->tm_min, tm->tm_hour, 360 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday); 361 362 if (rtc_valid_tm(tm) < 0) { 363 dev_err(dev, "invalid date\n"); 364 rtc_time_to_tm(0, tm); 365 } 366 367 return 0; 368 } 369 370 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm) 371 { 372 struct platform_device *pdev = to_platform_device(dev); 373 struct sh_rtc *rtc = platform_get_drvdata(pdev); 374 unsigned int tmp; 375 int year; 376 377 spin_lock_irq(&rtc->lock); 378 379 /* Reset pre-scaler & stop RTC */ 380 tmp = readb(rtc->regbase + RCR2); 381 tmp |= RCR2_RESET; 382 tmp &= ~RCR2_START; 383 writeb(tmp, rtc->regbase + RCR2); 384 385 writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT); 386 writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT); 387 writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT); 388 writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT); 389 writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT); 390 writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT); 391 392 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { 393 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) | 394 bin2bcd(tm->tm_year % 100); 395 writew(year, rtc->regbase + RYRCNT); 396 } else { 397 year = tm->tm_year % 100; 398 writeb(bin2bcd(year), rtc->regbase + RYRCNT); 399 } 400 401 /* Start RTC */ 402 tmp = readb(rtc->regbase + RCR2); 403 tmp &= ~RCR2_RESET; 404 tmp |= RCR2_RTCEN | RCR2_START; 405 writeb(tmp, rtc->regbase + RCR2); 406 407 spin_unlock_irq(&rtc->lock); 408 409 return 0; 410 } 411 412 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off) 413 { 414 unsigned int byte; 415 int value = 0xff; /* return 0xff for ignored values */ 416 417 byte = readb(rtc->regbase + reg_off); 418 if (byte & AR_ENB) { 419 byte &= ~AR_ENB; /* strip the enable bit */ 420 value = bcd2bin(byte); 421 } 422 423 return value; 424 } 425 426 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) 427 { 428 struct platform_device *pdev = to_platform_device(dev); 429 struct sh_rtc *rtc = platform_get_drvdata(pdev); 430 struct rtc_time *tm = &wkalrm->time; 431 432 spin_lock_irq(&rtc->lock); 433 434 tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR); 435 tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR); 436 tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR); 437 tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR); 438 tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR); 439 tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR); 440 if (tm->tm_mon > 0) 441 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */ 442 tm->tm_year = 0xffff; 443 444 wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0; 445 446 spin_unlock_irq(&rtc->lock); 447 448 return 0; 449 } 450 451 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc, 452 int value, int reg_off) 453 { 454 /* < 0 for a value that is ignored */ 455 if (value < 0) 456 writeb(0, rtc->regbase + reg_off); 457 else 458 writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off); 459 } 460 461 static int sh_rtc_check_alarm(struct rtc_time *tm) 462 { 463 /* 464 * The original rtc says anything > 0xc0 is "don't care" or "match 465 * all" - most users use 0xff but rtc-dev uses -1 for the same thing. 466 * The original rtc doesn't support years - some things use -1 and 467 * some 0xffff. We use -1 to make out tests easier. 468 */ 469 if (tm->tm_year == 0xffff) 470 tm->tm_year = -1; 471 if (tm->tm_mon >= 0xff) 472 tm->tm_mon = -1; 473 if (tm->tm_mday >= 0xff) 474 tm->tm_mday = -1; 475 if (tm->tm_wday >= 0xff) 476 tm->tm_wday = -1; 477 if (tm->tm_hour >= 0xff) 478 tm->tm_hour = -1; 479 if (tm->tm_min >= 0xff) 480 tm->tm_min = -1; 481 if (tm->tm_sec >= 0xff) 482 tm->tm_sec = -1; 483 484 if (tm->tm_year > 9999 || 485 tm->tm_mon >= 12 || 486 tm->tm_mday == 0 || tm->tm_mday >= 32 || 487 tm->tm_wday >= 7 || 488 tm->tm_hour >= 24 || 489 tm->tm_min >= 60 || 490 tm->tm_sec >= 60) 491 return -EINVAL; 492 493 return 0; 494 } 495 496 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) 497 { 498 struct platform_device *pdev = to_platform_device(dev); 499 struct sh_rtc *rtc = platform_get_drvdata(pdev); 500 unsigned int rcr1; 501 struct rtc_time *tm = &wkalrm->time; 502 int mon, err; 503 504 err = sh_rtc_check_alarm(tm); 505 if (unlikely(err < 0)) 506 return err; 507 508 spin_lock_irq(&rtc->lock); 509 510 /* disable alarm interrupt and clear the alarm flag */ 511 rcr1 = readb(rtc->regbase + RCR1); 512 rcr1 &= ~(RCR1_AF | RCR1_AIE); 513 writeb(rcr1, rtc->regbase + RCR1); 514 515 /* set alarm time */ 516 sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR); 517 sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR); 518 sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR); 519 sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR); 520 sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR); 521 mon = tm->tm_mon; 522 if (mon >= 0) 523 mon += 1; 524 sh_rtc_write_alarm_value(rtc, mon, RMONAR); 525 526 if (wkalrm->enabled) { 527 rcr1 |= RCR1_AIE; 528 writeb(rcr1, rtc->regbase + RCR1); 529 } 530 531 spin_unlock_irq(&rtc->lock); 532 533 return 0; 534 } 535 536 static int sh_rtc_irq_set_state(struct device *dev, int enabled) 537 { 538 struct platform_device *pdev = to_platform_device(dev); 539 struct sh_rtc *rtc = platform_get_drvdata(pdev); 540 541 if (enabled) { 542 rtc->periodic_freq |= PF_KOU; 543 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0); 544 } else { 545 rtc->periodic_freq &= ~PF_KOU; 546 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0); 547 } 548 } 549 550 static int sh_rtc_irq_set_freq(struct device *dev, int freq) 551 { 552 return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq); 553 } 554 555 static struct rtc_class_ops sh_rtc_ops = { 556 .ioctl = sh_rtc_ioctl, 557 .read_time = sh_rtc_read_time, 558 .set_time = sh_rtc_set_time, 559 .read_alarm = sh_rtc_read_alarm, 560 .set_alarm = sh_rtc_set_alarm, 561 .irq_set_state = sh_rtc_irq_set_state, 562 .irq_set_freq = sh_rtc_irq_set_freq, 563 .proc = sh_rtc_proc, 564 }; 565 566 static int __devinit sh_rtc_probe(struct platform_device *pdev) 567 { 568 struct sh_rtc *rtc; 569 struct resource *res; 570 unsigned int tmp; 571 int ret; 572 573 rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL); 574 if (unlikely(!rtc)) 575 return -ENOMEM; 576 577 spin_lock_init(&rtc->lock); 578 579 /* get periodic/carry/alarm irqs */ 580 ret = platform_get_irq(pdev, 0); 581 if (unlikely(ret < 0)) { 582 ret = -ENOENT; 583 dev_err(&pdev->dev, "No IRQ for period\n"); 584 goto err_badres; 585 } 586 rtc->periodic_irq = ret; 587 588 ret = platform_get_irq(pdev, 1); 589 if (unlikely(ret < 0)) { 590 ret = -ENOENT; 591 dev_err(&pdev->dev, "No IRQ for carry\n"); 592 goto err_badres; 593 } 594 rtc->carry_irq = ret; 595 596 ret = platform_get_irq(pdev, 2); 597 if (unlikely(ret < 0)) { 598 ret = -ENOENT; 599 dev_err(&pdev->dev, "No IRQ for alarm\n"); 600 goto err_badres; 601 } 602 rtc->alarm_irq = ret; 603 604 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 605 if (unlikely(res == NULL)) { 606 ret = -ENOENT; 607 dev_err(&pdev->dev, "No IO resource\n"); 608 goto err_badres; 609 } 610 611 rtc->regsize = res->end - res->start + 1; 612 613 rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name); 614 if (unlikely(!rtc->res)) { 615 ret = -EBUSY; 616 goto err_badres; 617 } 618 619 rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize); 620 if (unlikely(!rtc->regbase)) { 621 ret = -EINVAL; 622 goto err_badmap; 623 } 624 625 rtc->rtc_dev = rtc_device_register("sh", &pdev->dev, 626 &sh_rtc_ops, THIS_MODULE); 627 if (IS_ERR(rtc->rtc_dev)) { 628 ret = PTR_ERR(rtc->rtc_dev); 629 goto err_unmap; 630 } 631 632 rtc->capabilities = RTC_DEF_CAPABILITIES; 633 if (pdev->dev.platform_data) { 634 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data; 635 636 /* 637 * Some CPUs have special capabilities in addition to the 638 * default set. Add those in here. 639 */ 640 rtc->capabilities |= pinfo->capabilities; 641 } 642 643 rtc->rtc_dev->max_user_freq = 256; 644 rtc->rtc_dev->irq_freq = 1; 645 rtc->periodic_freq = 0x60; 646 647 platform_set_drvdata(pdev, rtc); 648 649 /* register periodic/carry/alarm irqs */ 650 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED, 651 "sh-rtc period", rtc); 652 if (unlikely(ret)) { 653 dev_err(&pdev->dev, 654 "request period IRQ failed with %d, IRQ %d\n", ret, 655 rtc->periodic_irq); 656 goto err_unmap; 657 } 658 659 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED, 660 "sh-rtc carry", rtc); 661 if (unlikely(ret)) { 662 dev_err(&pdev->dev, 663 "request carry IRQ failed with %d, IRQ %d\n", ret, 664 rtc->carry_irq); 665 free_irq(rtc->periodic_irq, rtc); 666 goto err_unmap; 667 } 668 669 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED, 670 "sh-rtc alarm", rtc); 671 if (unlikely(ret)) { 672 dev_err(&pdev->dev, 673 "request alarm IRQ failed with %d, IRQ %d\n", ret, 674 rtc->alarm_irq); 675 free_irq(rtc->carry_irq, rtc); 676 free_irq(rtc->periodic_irq, rtc); 677 goto err_unmap; 678 } 679 680 tmp = readb(rtc->regbase + RCR1); 681 tmp &= ~RCR1_CF; 682 tmp |= RCR1_CIE; 683 writeb(tmp, rtc->regbase + RCR1); 684 685 return 0; 686 687 err_unmap: 688 iounmap(rtc->regbase); 689 err_badmap: 690 release_resource(rtc->res); 691 err_badres: 692 kfree(rtc); 693 694 return ret; 695 } 696 697 static int __devexit sh_rtc_remove(struct platform_device *pdev) 698 { 699 struct sh_rtc *rtc = platform_get_drvdata(pdev); 700 701 if (likely(rtc->rtc_dev)) 702 rtc_device_unregister(rtc->rtc_dev); 703 704 sh_rtc_setpie(&pdev->dev, 0); 705 sh_rtc_setaie(&pdev->dev, 0); 706 707 free_irq(rtc->carry_irq, rtc); 708 free_irq(rtc->periodic_irq, rtc); 709 free_irq(rtc->alarm_irq, rtc); 710 711 release_resource(rtc->res); 712 713 iounmap(rtc->regbase); 714 715 platform_set_drvdata(pdev, NULL); 716 717 kfree(rtc); 718 719 return 0; 720 } 721 static struct platform_driver sh_rtc_platform_driver = { 722 .driver = { 723 .name = DRV_NAME, 724 .owner = THIS_MODULE, 725 }, 726 .probe = sh_rtc_probe, 727 .remove = __devexit_p(sh_rtc_remove), 728 }; 729 730 static int __init sh_rtc_init(void) 731 { 732 return platform_driver_register(&sh_rtc_platform_driver); 733 } 734 735 static void __exit sh_rtc_exit(void) 736 { 737 platform_driver_unregister(&sh_rtc_platform_driver); 738 } 739 740 module_init(sh_rtc_init); 741 module_exit(sh_rtc_exit); 742 743 MODULE_DESCRIPTION("SuperH on-chip RTC driver"); 744 MODULE_VERSION(DRV_VERSION); 745 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, " 746 "Jamie Lenehan <lenehan@twibble.org>, " 747 "Angelo Castello <angelo.castello@st.com>"); 748 MODULE_LICENSE("GPL"); 749 MODULE_ALIAS("platform:" DRV_NAME); 750