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 <linux/log2.h> 28 #include <asm/rtc.h> 29 30 #define DRV_NAME "sh-rtc" 31 #define DRV_VERSION "0.2.0" 32 33 #define RTC_REG(r) ((r) * rtc_reg_size) 34 35 #define R64CNT RTC_REG(0) 36 37 #define RSECCNT RTC_REG(1) /* RTC sec */ 38 #define RMINCNT RTC_REG(2) /* RTC min */ 39 #define RHRCNT RTC_REG(3) /* RTC hour */ 40 #define RWKCNT RTC_REG(4) /* RTC week */ 41 #define RDAYCNT RTC_REG(5) /* RTC day */ 42 #define RMONCNT RTC_REG(6) /* RTC month */ 43 #define RYRCNT RTC_REG(7) /* RTC year */ 44 #define RSECAR RTC_REG(8) /* ALARM sec */ 45 #define RMINAR RTC_REG(9) /* ALARM min */ 46 #define RHRAR RTC_REG(10) /* ALARM hour */ 47 #define RWKAR RTC_REG(11) /* ALARM week */ 48 #define RDAYAR RTC_REG(12) /* ALARM day */ 49 #define RMONAR RTC_REG(13) /* ALARM month */ 50 #define RCR1 RTC_REG(14) /* Control */ 51 #define RCR2 RTC_REG(15) /* Control */ 52 53 /* 54 * Note on RYRAR and RCR3: Up until this point most of the register 55 * definitions are consistent across all of the available parts. However, 56 * the placement of the optional RYRAR and RCR3 (the RYRAR control 57 * register used to control RYRCNT/RYRAR compare) varies considerably 58 * across various parts, occasionally being mapped in to a completely 59 * unrelated address space. For proper RYRAR support a separate resource 60 * would have to be handed off, but as this is purely optional in 61 * practice, we simply opt not to support it, thereby keeping the code 62 * quite a bit more simplified. 63 */ 64 65 /* ALARM Bits - or with BCD encoded value */ 66 #define AR_ENB 0x80 /* Enable for alarm cmp */ 67 68 /* Period Bits */ 69 #define PF_HP 0x100 /* Enable Half Period to support 8,32,128Hz */ 70 #define PF_COUNT 0x200 /* Half periodic counter */ 71 #define PF_OXS 0x400 /* Periodic One x Second */ 72 #define PF_KOU 0x800 /* Kernel or User periodic request 1=kernel */ 73 #define PF_MASK 0xf00 74 75 /* RCR1 Bits */ 76 #define RCR1_CF 0x80 /* Carry Flag */ 77 #define RCR1_CIE 0x10 /* Carry Interrupt Enable */ 78 #define RCR1_AIE 0x08 /* Alarm Interrupt Enable */ 79 #define RCR1_AF 0x01 /* Alarm Flag */ 80 81 /* RCR2 Bits */ 82 #define RCR2_PEF 0x80 /* PEriodic interrupt Flag */ 83 #define RCR2_PESMASK 0x70 /* Periodic interrupt Set */ 84 #define RCR2_RTCEN 0x08 /* ENable RTC */ 85 #define RCR2_ADJ 0x04 /* ADJustment (30-second) */ 86 #define RCR2_RESET 0x02 /* Reset bit */ 87 #define RCR2_START 0x01 /* Start bit */ 88 89 struct sh_rtc { 90 void __iomem *regbase; 91 unsigned long regsize; 92 struct resource *res; 93 int alarm_irq; 94 int periodic_irq; 95 int carry_irq; 96 struct rtc_device *rtc_dev; 97 spinlock_t lock; 98 unsigned long capabilities; /* See asm-sh/rtc.h for cap bits */ 99 unsigned short periodic_freq; 100 }; 101 102 static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id) 103 { 104 struct sh_rtc *rtc = dev_id; 105 unsigned int tmp; 106 107 spin_lock(&rtc->lock); 108 109 tmp = readb(rtc->regbase + RCR1); 110 tmp &= ~RCR1_CF; 111 writeb(tmp, rtc->regbase + RCR1); 112 113 /* Users have requested One x Second IRQ */ 114 if (rtc->periodic_freq & PF_OXS) 115 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF); 116 117 spin_unlock(&rtc->lock); 118 119 return IRQ_HANDLED; 120 } 121 122 static irqreturn_t sh_rtc_alarm(int irq, void *dev_id) 123 { 124 struct sh_rtc *rtc = dev_id; 125 unsigned int tmp; 126 127 spin_lock(&rtc->lock); 128 129 tmp = readb(rtc->regbase + RCR1); 130 tmp &= ~(RCR1_AF | RCR1_AIE); 131 writeb(tmp, rtc->regbase + RCR1); 132 133 rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); 134 135 spin_unlock(&rtc->lock); 136 137 return IRQ_HANDLED; 138 } 139 140 static irqreturn_t sh_rtc_periodic(int irq, void *dev_id) 141 { 142 struct sh_rtc *rtc = dev_id; 143 struct rtc_device *rtc_dev = rtc->rtc_dev; 144 unsigned int tmp; 145 146 spin_lock(&rtc->lock); 147 148 tmp = readb(rtc->regbase + RCR2); 149 tmp &= ~RCR2_PEF; 150 writeb(tmp, rtc->regbase + RCR2); 151 152 /* Half period enabled than one skipped and the next notified */ 153 if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT)) 154 rtc->periodic_freq &= ~PF_COUNT; 155 else { 156 if (rtc->periodic_freq & PF_HP) 157 rtc->periodic_freq |= PF_COUNT; 158 if (rtc->periodic_freq & PF_KOU) { 159 spin_lock(&rtc_dev->irq_task_lock); 160 if (rtc_dev->irq_task) 161 rtc_dev->irq_task->func(rtc_dev->irq_task->private_data); 162 spin_unlock(&rtc_dev->irq_task_lock); 163 } else 164 rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF); 165 } 166 167 spin_unlock(&rtc->lock); 168 169 return IRQ_HANDLED; 170 } 171 172 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable) 173 { 174 struct sh_rtc *rtc = dev_get_drvdata(dev); 175 unsigned int tmp; 176 177 spin_lock_irq(&rtc->lock); 178 179 tmp = readb(rtc->regbase + RCR2); 180 181 if (enable) { 182 tmp &= ~RCR2_PEF; /* Clear PES bit */ 183 tmp |= (rtc->periodic_freq & ~PF_HP); /* Set PES2-0 */ 184 } else 185 tmp &= ~(RCR2_PESMASK | RCR2_PEF); 186 187 writeb(tmp, rtc->regbase + RCR2); 188 189 spin_unlock_irq(&rtc->lock); 190 } 191 192 static inline int sh_rtc_setfreq(struct device *dev, unsigned int freq) 193 { 194 struct sh_rtc *rtc = dev_get_drvdata(dev); 195 int tmp, ret = 0; 196 197 spin_lock_irq(&rtc->lock); 198 tmp = rtc->periodic_freq & PF_MASK; 199 200 switch (freq) { 201 case 0: 202 rtc->periodic_freq = 0x00; 203 break; 204 case 1: 205 rtc->periodic_freq = 0x60; 206 break; 207 case 2: 208 rtc->periodic_freq = 0x50; 209 break; 210 case 4: 211 rtc->periodic_freq = 0x40; 212 break; 213 case 8: 214 rtc->periodic_freq = 0x30 | PF_HP; 215 break; 216 case 16: 217 rtc->periodic_freq = 0x30; 218 break; 219 case 32: 220 rtc->periodic_freq = 0x20 | PF_HP; 221 break; 222 case 64: 223 rtc->periodic_freq = 0x20; 224 break; 225 case 128: 226 rtc->periodic_freq = 0x10 | PF_HP; 227 break; 228 case 256: 229 rtc->periodic_freq = 0x10; 230 break; 231 default: 232 ret = -ENOTSUPP; 233 } 234 235 if (ret == 0) { 236 rtc->periodic_freq |= tmp; 237 rtc->rtc_dev->irq_freq = freq; 238 } 239 240 spin_unlock_irq(&rtc->lock); 241 return ret; 242 } 243 244 static inline void sh_rtc_setaie(struct device *dev, unsigned int enable) 245 { 246 struct sh_rtc *rtc = dev_get_drvdata(dev); 247 unsigned int tmp; 248 249 spin_lock_irq(&rtc->lock); 250 251 tmp = readb(rtc->regbase + RCR1); 252 253 if (!enable) 254 tmp &= ~RCR1_AIE; 255 else 256 tmp |= RCR1_AIE; 257 258 writeb(tmp, rtc->regbase + RCR1); 259 260 spin_unlock_irq(&rtc->lock); 261 } 262 263 static int sh_rtc_proc(struct device *dev, struct seq_file *seq) 264 { 265 struct sh_rtc *rtc = dev_get_drvdata(dev); 266 unsigned int tmp; 267 268 tmp = readb(rtc->regbase + RCR1); 269 seq_printf(seq, "carry_IRQ\t: %s\n", (tmp & RCR1_CIE) ? "yes" : "no"); 270 271 tmp = readb(rtc->regbase + RCR2); 272 seq_printf(seq, "periodic_IRQ\t: %s\n", 273 (tmp & RCR2_PESMASK) ? "yes" : "no"); 274 275 return 0; 276 } 277 278 static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) 279 { 280 struct sh_rtc *rtc = dev_get_drvdata(dev); 281 unsigned int ret = 0; 282 283 switch (cmd) { 284 case RTC_PIE_OFF: 285 case RTC_PIE_ON: 286 sh_rtc_setpie(dev, cmd == RTC_PIE_ON); 287 break; 288 case RTC_AIE_OFF: 289 case RTC_AIE_ON: 290 sh_rtc_setaie(dev, cmd == RTC_AIE_ON); 291 break; 292 case RTC_UIE_OFF: 293 rtc->periodic_freq &= ~PF_OXS; 294 break; 295 case RTC_UIE_ON: 296 rtc->periodic_freq |= PF_OXS; 297 break; 298 case RTC_IRQP_READ: 299 ret = put_user(rtc->rtc_dev->irq_freq, 300 (unsigned long __user *)arg); 301 break; 302 case RTC_IRQP_SET: 303 ret = sh_rtc_setfreq(dev, arg); 304 break; 305 default: 306 ret = -ENOIOCTLCMD; 307 } 308 309 return ret; 310 } 311 312 static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm) 313 { 314 struct platform_device *pdev = to_platform_device(dev); 315 struct sh_rtc *rtc = platform_get_drvdata(pdev); 316 unsigned int sec128, sec2, yr, yr100, cf_bit; 317 318 do { 319 unsigned int tmp; 320 321 spin_lock_irq(&rtc->lock); 322 323 tmp = readb(rtc->regbase + RCR1); 324 tmp &= ~RCR1_CF; /* Clear CF-bit */ 325 tmp |= RCR1_CIE; 326 writeb(tmp, rtc->regbase + RCR1); 327 328 sec128 = readb(rtc->regbase + R64CNT); 329 330 tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT)); 331 tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT)); 332 tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT)); 333 tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT)); 334 tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT)); 335 tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1; 336 337 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { 338 yr = readw(rtc->regbase + RYRCNT); 339 yr100 = bcd2bin(yr >> 8); 340 yr &= 0xff; 341 } else { 342 yr = readb(rtc->regbase + RYRCNT); 343 yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20); 344 } 345 346 tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900; 347 348 sec2 = readb(rtc->regbase + R64CNT); 349 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF; 350 351 spin_unlock_irq(&rtc->lock); 352 } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0); 353 354 #if RTC_BIT_INVERTED != 0 355 if ((sec128 & RTC_BIT_INVERTED)) 356 tm->tm_sec--; 357 #endif 358 359 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, " 360 "mday=%d, mon=%d, year=%d, wday=%d\n", 361 __func__, 362 tm->tm_sec, tm->tm_min, tm->tm_hour, 363 tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday); 364 365 if (rtc_valid_tm(tm) < 0) { 366 dev_err(dev, "invalid date\n"); 367 rtc_time_to_tm(0, tm); 368 } 369 370 return 0; 371 } 372 373 static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm) 374 { 375 struct platform_device *pdev = to_platform_device(dev); 376 struct sh_rtc *rtc = platform_get_drvdata(pdev); 377 unsigned int tmp; 378 int year; 379 380 spin_lock_irq(&rtc->lock); 381 382 /* Reset pre-scaler & stop RTC */ 383 tmp = readb(rtc->regbase + RCR2); 384 tmp |= RCR2_RESET; 385 tmp &= ~RCR2_START; 386 writeb(tmp, rtc->regbase + RCR2); 387 388 writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT); 389 writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT); 390 writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT); 391 writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT); 392 writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT); 393 writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT); 394 395 if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { 396 year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) | 397 bin2bcd(tm->tm_year % 100); 398 writew(year, rtc->regbase + RYRCNT); 399 } else { 400 year = tm->tm_year % 100; 401 writeb(bin2bcd(year), rtc->regbase + RYRCNT); 402 } 403 404 /* Start RTC */ 405 tmp = readb(rtc->regbase + RCR2); 406 tmp &= ~RCR2_RESET; 407 tmp |= RCR2_RTCEN | RCR2_START; 408 writeb(tmp, rtc->regbase + RCR2); 409 410 spin_unlock_irq(&rtc->lock); 411 412 return 0; 413 } 414 415 static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off) 416 { 417 unsigned int byte; 418 int value = 0xff; /* return 0xff for ignored values */ 419 420 byte = readb(rtc->regbase + reg_off); 421 if (byte & AR_ENB) { 422 byte &= ~AR_ENB; /* strip the enable bit */ 423 value = bcd2bin(byte); 424 } 425 426 return value; 427 } 428 429 static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) 430 { 431 struct platform_device *pdev = to_platform_device(dev); 432 struct sh_rtc *rtc = platform_get_drvdata(pdev); 433 struct rtc_time *tm = &wkalrm->time; 434 435 spin_lock_irq(&rtc->lock); 436 437 tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR); 438 tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR); 439 tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR); 440 tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR); 441 tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR); 442 tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR); 443 if (tm->tm_mon > 0) 444 tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */ 445 tm->tm_year = 0xffff; 446 447 wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0; 448 449 spin_unlock_irq(&rtc->lock); 450 451 return 0; 452 } 453 454 static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc, 455 int value, int reg_off) 456 { 457 /* < 0 for a value that is ignored */ 458 if (value < 0) 459 writeb(0, rtc->regbase + reg_off); 460 else 461 writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off); 462 } 463 464 static int sh_rtc_check_alarm(struct rtc_time *tm) 465 { 466 /* 467 * The original rtc says anything > 0xc0 is "don't care" or "match 468 * all" - most users use 0xff but rtc-dev uses -1 for the same thing. 469 * The original rtc doesn't support years - some things use -1 and 470 * some 0xffff. We use -1 to make out tests easier. 471 */ 472 if (tm->tm_year == 0xffff) 473 tm->tm_year = -1; 474 if (tm->tm_mon >= 0xff) 475 tm->tm_mon = -1; 476 if (tm->tm_mday >= 0xff) 477 tm->tm_mday = -1; 478 if (tm->tm_wday >= 0xff) 479 tm->tm_wday = -1; 480 if (tm->tm_hour >= 0xff) 481 tm->tm_hour = -1; 482 if (tm->tm_min >= 0xff) 483 tm->tm_min = -1; 484 if (tm->tm_sec >= 0xff) 485 tm->tm_sec = -1; 486 487 if (tm->tm_year > 9999 || 488 tm->tm_mon >= 12 || 489 tm->tm_mday == 0 || tm->tm_mday >= 32 || 490 tm->tm_wday >= 7 || 491 tm->tm_hour >= 24 || 492 tm->tm_min >= 60 || 493 tm->tm_sec >= 60) 494 return -EINVAL; 495 496 return 0; 497 } 498 499 static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) 500 { 501 struct platform_device *pdev = to_platform_device(dev); 502 struct sh_rtc *rtc = platform_get_drvdata(pdev); 503 unsigned int rcr1; 504 struct rtc_time *tm = &wkalrm->time; 505 int mon, err; 506 507 err = sh_rtc_check_alarm(tm); 508 if (unlikely(err < 0)) 509 return err; 510 511 spin_lock_irq(&rtc->lock); 512 513 /* disable alarm interrupt and clear the alarm flag */ 514 rcr1 = readb(rtc->regbase + RCR1); 515 rcr1 &= ~(RCR1_AF | RCR1_AIE); 516 writeb(rcr1, rtc->regbase + RCR1); 517 518 /* set alarm time */ 519 sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR); 520 sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR); 521 sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR); 522 sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR); 523 sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR); 524 mon = tm->tm_mon; 525 if (mon >= 0) 526 mon += 1; 527 sh_rtc_write_alarm_value(rtc, mon, RMONAR); 528 529 if (wkalrm->enabled) { 530 rcr1 |= RCR1_AIE; 531 writeb(rcr1, rtc->regbase + RCR1); 532 } 533 534 spin_unlock_irq(&rtc->lock); 535 536 return 0; 537 } 538 539 static int sh_rtc_irq_set_state(struct device *dev, int enabled) 540 { 541 struct platform_device *pdev = to_platform_device(dev); 542 struct sh_rtc *rtc = platform_get_drvdata(pdev); 543 544 if (enabled) { 545 rtc->periodic_freq |= PF_KOU; 546 return sh_rtc_ioctl(dev, RTC_PIE_ON, 0); 547 } else { 548 rtc->periodic_freq &= ~PF_KOU; 549 return sh_rtc_ioctl(dev, RTC_PIE_OFF, 0); 550 } 551 } 552 553 static int sh_rtc_irq_set_freq(struct device *dev, int freq) 554 { 555 if (!is_power_of_2(freq)) 556 return -EINVAL; 557 return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq); 558 } 559 560 static struct rtc_class_ops sh_rtc_ops = { 561 .ioctl = sh_rtc_ioctl, 562 .read_time = sh_rtc_read_time, 563 .set_time = sh_rtc_set_time, 564 .read_alarm = sh_rtc_read_alarm, 565 .set_alarm = sh_rtc_set_alarm, 566 .irq_set_state = sh_rtc_irq_set_state, 567 .irq_set_freq = sh_rtc_irq_set_freq, 568 .proc = sh_rtc_proc, 569 }; 570 571 static int __devinit sh_rtc_probe(struct platform_device *pdev) 572 { 573 struct sh_rtc *rtc; 574 struct resource *res; 575 unsigned int tmp; 576 int ret; 577 578 rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL); 579 if (unlikely(!rtc)) 580 return -ENOMEM; 581 582 spin_lock_init(&rtc->lock); 583 584 /* get periodic/carry/alarm irqs */ 585 ret = platform_get_irq(pdev, 0); 586 if (unlikely(ret <= 0)) { 587 ret = -ENOENT; 588 dev_err(&pdev->dev, "No IRQ for period\n"); 589 goto err_badres; 590 } 591 rtc->periodic_irq = ret; 592 593 ret = platform_get_irq(pdev, 1); 594 if (unlikely(ret <= 0)) { 595 ret = -ENOENT; 596 dev_err(&pdev->dev, "No IRQ for carry\n"); 597 goto err_badres; 598 } 599 rtc->carry_irq = ret; 600 601 ret = platform_get_irq(pdev, 2); 602 if (unlikely(ret <= 0)) { 603 ret = -ENOENT; 604 dev_err(&pdev->dev, "No IRQ for alarm\n"); 605 goto err_badres; 606 } 607 rtc->alarm_irq = ret; 608 609 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 610 if (unlikely(res == NULL)) { 611 ret = -ENOENT; 612 dev_err(&pdev->dev, "No IO resource\n"); 613 goto err_badres; 614 } 615 616 rtc->regsize = res->end - res->start + 1; 617 618 rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name); 619 if (unlikely(!rtc->res)) { 620 ret = -EBUSY; 621 goto err_badres; 622 } 623 624 rtc->regbase = ioremap_nocache(rtc->res->start, rtc->regsize); 625 if (unlikely(!rtc->regbase)) { 626 ret = -EINVAL; 627 goto err_badmap; 628 } 629 630 rtc->rtc_dev = rtc_device_register("sh", &pdev->dev, 631 &sh_rtc_ops, THIS_MODULE); 632 if (IS_ERR(rtc->rtc_dev)) { 633 ret = PTR_ERR(rtc->rtc_dev); 634 goto err_unmap; 635 } 636 637 rtc->capabilities = RTC_DEF_CAPABILITIES; 638 if (pdev->dev.platform_data) { 639 struct sh_rtc_platform_info *pinfo = pdev->dev.platform_data; 640 641 /* 642 * Some CPUs have special capabilities in addition to the 643 * default set. Add those in here. 644 */ 645 rtc->capabilities |= pinfo->capabilities; 646 } 647 648 rtc->rtc_dev->max_user_freq = 256; 649 rtc->rtc_dev->irq_freq = 1; 650 rtc->periodic_freq = 0x60; 651 652 platform_set_drvdata(pdev, rtc); 653 654 /* register periodic/carry/alarm irqs */ 655 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED, 656 "sh-rtc period", rtc); 657 if (unlikely(ret)) { 658 dev_err(&pdev->dev, 659 "request period IRQ failed with %d, IRQ %d\n", ret, 660 rtc->periodic_irq); 661 goto err_unmap; 662 } 663 664 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED, 665 "sh-rtc carry", rtc); 666 if (unlikely(ret)) { 667 dev_err(&pdev->dev, 668 "request carry IRQ failed with %d, IRQ %d\n", ret, 669 rtc->carry_irq); 670 free_irq(rtc->periodic_irq, rtc); 671 goto err_unmap; 672 } 673 674 ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED, 675 "sh-rtc alarm", rtc); 676 if (unlikely(ret)) { 677 dev_err(&pdev->dev, 678 "request alarm IRQ failed with %d, IRQ %d\n", ret, 679 rtc->alarm_irq); 680 free_irq(rtc->carry_irq, rtc); 681 free_irq(rtc->periodic_irq, rtc); 682 goto err_unmap; 683 } 684 685 tmp = readb(rtc->regbase + RCR1); 686 tmp &= ~RCR1_CF; 687 tmp |= RCR1_CIE; 688 writeb(tmp, rtc->regbase + RCR1); 689 690 return 0; 691 692 err_unmap: 693 iounmap(rtc->regbase); 694 err_badmap: 695 release_resource(rtc->res); 696 err_badres: 697 kfree(rtc); 698 699 return ret; 700 } 701 702 static int __devexit sh_rtc_remove(struct platform_device *pdev) 703 { 704 struct sh_rtc *rtc = platform_get_drvdata(pdev); 705 706 if (likely(rtc->rtc_dev)) 707 rtc_device_unregister(rtc->rtc_dev); 708 709 sh_rtc_setpie(&pdev->dev, 0); 710 sh_rtc_setaie(&pdev->dev, 0); 711 712 free_irq(rtc->carry_irq, rtc); 713 free_irq(rtc->periodic_irq, rtc); 714 free_irq(rtc->alarm_irq, rtc); 715 716 release_resource(rtc->res); 717 718 iounmap(rtc->regbase); 719 720 platform_set_drvdata(pdev, NULL); 721 722 kfree(rtc); 723 724 return 0; 725 } 726 static struct platform_driver sh_rtc_platform_driver = { 727 .driver = { 728 .name = DRV_NAME, 729 .owner = THIS_MODULE, 730 }, 731 .probe = sh_rtc_probe, 732 .remove = __devexit_p(sh_rtc_remove), 733 }; 734 735 static int __init sh_rtc_init(void) 736 { 737 return platform_driver_register(&sh_rtc_platform_driver); 738 } 739 740 static void __exit sh_rtc_exit(void) 741 { 742 platform_driver_unregister(&sh_rtc_platform_driver); 743 } 744 745 module_init(sh_rtc_init); 746 module_exit(sh_rtc_exit); 747 748 MODULE_DESCRIPTION("SuperH on-chip RTC driver"); 749 MODULE_VERSION(DRV_VERSION); 750 MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>, " 751 "Jamie Lenehan <lenehan@twibble.org>, " 752 "Angelo Castello <angelo.castello@st.com>"); 753 MODULE_LICENSE("GPL"); 754 MODULE_ALIAS("platform:" DRV_NAME); 755