Ben Dooks | 1add678 | 2006-07-01 04:36:26 -0700 | [diff] [blame] | 1 | /* drivers/rtc/rtc-s3c.c |
| 2 | * |
| 3 | * Copyright (c) 2004,2006 Simtec Electronics |
| 4 | * Ben Dooks, <ben@simtec.co.uk> |
| 5 | * http://armlinux.simtec.co.uk/ |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * S3C2410/S3C2440/S3C24XX Internal RTC Driver |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/rtc.h> |
| 21 | #include <linux/bcd.h> |
| 22 | #include <linux/clk.h> |
| 23 | |
| 24 | #include <asm/hardware.h> |
| 25 | #include <asm/uaccess.h> |
| 26 | #include <asm/io.h> |
| 27 | #include <asm/irq.h> |
| 28 | #include <asm/rtc.h> |
| 29 | |
| 30 | #include <asm/mach/time.h> |
| 31 | |
| 32 | #include <asm/arch/regs-rtc.h> |
| 33 | |
| 34 | /* I have yet to find an S3C implementation with more than one |
| 35 | * of these rtc blocks in */ |
| 36 | |
| 37 | static struct resource *s3c_rtc_mem; |
| 38 | |
| 39 | static void __iomem *s3c_rtc_base; |
| 40 | static int s3c_rtc_alarmno = NO_IRQ; |
| 41 | static int s3c_rtc_tickno = NO_IRQ; |
| 42 | static int s3c_rtc_freq = 1; |
| 43 | |
| 44 | static DEFINE_SPINLOCK(s3c_rtc_pie_lock); |
| 45 | static unsigned int tick_count; |
| 46 | |
| 47 | /* IRQ Handlers */ |
| 48 | |
| 49 | static irqreturn_t s3c_rtc_alarmirq(int irq, void *id, struct pt_regs *r) |
| 50 | { |
| 51 | struct rtc_device *rdev = id; |
| 52 | |
| 53 | rtc_update_irq(&rdev->class_dev, 1, RTC_AF | RTC_IRQF); |
| 54 | return IRQ_HANDLED; |
| 55 | } |
| 56 | |
| 57 | static irqreturn_t s3c_rtc_tickirq(int irq, void *id, struct pt_regs *r) |
| 58 | { |
| 59 | struct rtc_device *rdev = id; |
| 60 | |
| 61 | rtc_update_irq(&rdev->class_dev, tick_count++, RTC_PF | RTC_IRQF); |
| 62 | return IRQ_HANDLED; |
| 63 | } |
| 64 | |
| 65 | /* Update control registers */ |
| 66 | static void s3c_rtc_setaie(int to) |
| 67 | { |
| 68 | unsigned int tmp; |
| 69 | |
| 70 | pr_debug("%s: aie=%d\n", __FUNCTION__, to); |
| 71 | |
| 72 | tmp = readb(S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN; |
| 73 | |
| 74 | if (to) |
| 75 | tmp |= S3C2410_RTCALM_ALMEN; |
| 76 | |
| 77 | writeb(tmp, S3C2410_RTCALM); |
| 78 | } |
| 79 | |
| 80 | static void s3c_rtc_setpie(int to) |
| 81 | { |
| 82 | unsigned int tmp; |
| 83 | |
| 84 | pr_debug("%s: pie=%d\n", __FUNCTION__, to); |
| 85 | |
| 86 | spin_lock_irq(&s3c_rtc_pie_lock); |
| 87 | tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE; |
| 88 | |
| 89 | if (to) |
| 90 | tmp |= S3C2410_TICNT_ENABLE; |
| 91 | |
| 92 | writeb(tmp, S3C2410_TICNT); |
| 93 | spin_unlock_irq(&s3c_rtc_pie_lock); |
| 94 | } |
| 95 | |
| 96 | static void s3c_rtc_setfreq(int freq) |
| 97 | { |
| 98 | unsigned int tmp; |
| 99 | |
| 100 | spin_lock_irq(&s3c_rtc_pie_lock); |
| 101 | tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE; |
| 102 | |
| 103 | s3c_rtc_freq = freq; |
| 104 | |
| 105 | tmp |= (128 / freq)-1; |
| 106 | |
| 107 | writeb(tmp, S3C2410_TICNT); |
| 108 | spin_unlock_irq(&s3c_rtc_pie_lock); |
| 109 | } |
| 110 | |
| 111 | /* Time read/write */ |
| 112 | |
| 113 | static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) |
| 114 | { |
| 115 | unsigned int have_retried = 0; |
| 116 | |
| 117 | retry_get_time: |
| 118 | rtc_tm->tm_min = readb(S3C2410_RTCMIN); |
| 119 | rtc_tm->tm_hour = readb(S3C2410_RTCHOUR); |
| 120 | rtc_tm->tm_mday = readb(S3C2410_RTCDATE); |
| 121 | rtc_tm->tm_mon = readb(S3C2410_RTCMON); |
| 122 | rtc_tm->tm_year = readb(S3C2410_RTCYEAR); |
| 123 | rtc_tm->tm_sec = readb(S3C2410_RTCSEC); |
| 124 | |
| 125 | /* the only way to work out wether the system was mid-update |
| 126 | * when we read it is to check the second counter, and if it |
| 127 | * is zero, then we re-try the entire read |
| 128 | */ |
| 129 | |
| 130 | if (rtc_tm->tm_sec == 0 && !have_retried) { |
| 131 | have_retried = 1; |
| 132 | goto retry_get_time; |
| 133 | } |
| 134 | |
| 135 | pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", |
| 136 | rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, |
| 137 | rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); |
| 138 | |
| 139 | BCD_TO_BIN(rtc_tm->tm_sec); |
| 140 | BCD_TO_BIN(rtc_tm->tm_min); |
| 141 | BCD_TO_BIN(rtc_tm->tm_hour); |
| 142 | BCD_TO_BIN(rtc_tm->tm_mday); |
| 143 | BCD_TO_BIN(rtc_tm->tm_mon); |
| 144 | BCD_TO_BIN(rtc_tm->tm_year); |
| 145 | |
| 146 | rtc_tm->tm_year += 100; |
| 147 | rtc_tm->tm_mon -= 1; |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) |
| 153 | { |
| 154 | /* the rtc gets round the y2k problem by just not supporting it */ |
| 155 | |
| 156 | if (tm->tm_year < 100) |
| 157 | return -EINVAL; |
| 158 | |
| 159 | writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC); |
| 160 | writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN); |
| 161 | writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR); |
| 162 | writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE); |
| 163 | writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON); |
| 164 | writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 170 | { |
| 171 | struct rtc_time *alm_tm = &alrm->time; |
| 172 | unsigned int alm_en; |
| 173 | |
| 174 | alm_tm->tm_sec = readb(S3C2410_ALMSEC); |
| 175 | alm_tm->tm_min = readb(S3C2410_ALMMIN); |
| 176 | alm_tm->tm_hour = readb(S3C2410_ALMHOUR); |
| 177 | alm_tm->tm_mon = readb(S3C2410_ALMMON); |
| 178 | alm_tm->tm_mday = readb(S3C2410_ALMDATE); |
| 179 | alm_tm->tm_year = readb(S3C2410_ALMYEAR); |
| 180 | |
| 181 | alm_en = readb(S3C2410_RTCALM); |
| 182 | |
| 183 | pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", |
| 184 | alm_en, |
| 185 | alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, |
| 186 | alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); |
| 187 | |
| 188 | |
| 189 | /* decode the alarm enable field */ |
| 190 | |
| 191 | if (alm_en & S3C2410_RTCALM_SECEN) |
| 192 | BCD_TO_BIN(alm_tm->tm_sec); |
| 193 | else |
| 194 | alm_tm->tm_sec = 0xff; |
| 195 | |
| 196 | if (alm_en & S3C2410_RTCALM_MINEN) |
| 197 | BCD_TO_BIN(alm_tm->tm_min); |
| 198 | else |
| 199 | alm_tm->tm_min = 0xff; |
| 200 | |
| 201 | if (alm_en & S3C2410_RTCALM_HOUREN) |
| 202 | BCD_TO_BIN(alm_tm->tm_hour); |
| 203 | else |
| 204 | alm_tm->tm_hour = 0xff; |
| 205 | |
| 206 | if (alm_en & S3C2410_RTCALM_DAYEN) |
| 207 | BCD_TO_BIN(alm_tm->tm_mday); |
| 208 | else |
| 209 | alm_tm->tm_mday = 0xff; |
| 210 | |
| 211 | if (alm_en & S3C2410_RTCALM_MONEN) { |
| 212 | BCD_TO_BIN(alm_tm->tm_mon); |
| 213 | alm_tm->tm_mon -= 1; |
| 214 | } else { |
| 215 | alm_tm->tm_mon = 0xff; |
| 216 | } |
| 217 | |
| 218 | if (alm_en & S3C2410_RTCALM_YEAREN) |
| 219 | BCD_TO_BIN(alm_tm->tm_year); |
| 220 | else |
| 221 | alm_tm->tm_year = 0xffff; |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 227 | { |
| 228 | struct rtc_time *tm = &alrm->time; |
| 229 | unsigned int alrm_en; |
| 230 | |
| 231 | pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", |
| 232 | alrm->enabled, |
| 233 | tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, |
| 234 | tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec); |
| 235 | |
| 236 | |
| 237 | alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; |
| 238 | writeb(0x00, S3C2410_RTCALM); |
| 239 | |
| 240 | if (tm->tm_sec < 60 && tm->tm_sec >= 0) { |
| 241 | alrm_en |= S3C2410_RTCALM_SECEN; |
| 242 | writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC); |
| 243 | } |
| 244 | |
| 245 | if (tm->tm_min < 60 && tm->tm_min >= 0) { |
| 246 | alrm_en |= S3C2410_RTCALM_MINEN; |
| 247 | writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN); |
| 248 | } |
| 249 | |
| 250 | if (tm->tm_hour < 24 && tm->tm_hour >= 0) { |
| 251 | alrm_en |= S3C2410_RTCALM_HOUREN; |
| 252 | writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR); |
| 253 | } |
| 254 | |
| 255 | pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en); |
| 256 | |
| 257 | writeb(alrm_en, S3C2410_RTCALM); |
| 258 | |
| 259 | if (0) { |
| 260 | alrm_en = readb(S3C2410_RTCALM); |
| 261 | alrm_en &= ~S3C2410_RTCALM_ALMEN; |
| 262 | writeb(alrm_en, S3C2410_RTCALM); |
| 263 | disable_irq_wake(s3c_rtc_alarmno); |
| 264 | } |
| 265 | |
| 266 | if (alrm->enabled) |
| 267 | enable_irq_wake(s3c_rtc_alarmno); |
| 268 | else |
| 269 | disable_irq_wake(s3c_rtc_alarmno); |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | static int s3c_rtc_ioctl(struct device *dev, |
| 275 | unsigned int cmd, unsigned long arg) |
| 276 | { |
| 277 | unsigned int ret = -ENOIOCTLCMD; |
| 278 | |
| 279 | switch (cmd) { |
| 280 | case RTC_AIE_OFF: |
| 281 | case RTC_AIE_ON: |
| 282 | s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0); |
| 283 | ret = 0; |
| 284 | break; |
| 285 | |
| 286 | case RTC_PIE_OFF: |
| 287 | case RTC_PIE_ON: |
| 288 | tick_count = 0; |
| 289 | s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0); |
| 290 | ret = 0; |
| 291 | break; |
| 292 | |
| 293 | case RTC_IRQP_READ: |
| 294 | ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg); |
| 295 | break; |
| 296 | |
| 297 | case RTC_IRQP_SET: |
| 298 | /* check for power of 2 */ |
| 299 | |
| 300 | if ((arg & (arg-1)) != 0 || arg < 1) { |
| 301 | ret = -EINVAL; |
| 302 | goto exit; |
| 303 | } |
| 304 | |
| 305 | pr_debug("s3c2410_rtc: setting frequency %ld\n", arg); |
| 306 | |
| 307 | s3c_rtc_setfreq(arg); |
| 308 | ret = 0; |
| 309 | break; |
| 310 | |
| 311 | case RTC_UIE_ON: |
| 312 | case RTC_UIE_OFF: |
| 313 | ret = -EINVAL; |
| 314 | } |
| 315 | |
| 316 | exit: |
| 317 | return ret; |
| 318 | } |
| 319 | |
| 320 | static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) |
| 321 | { |
| 322 | unsigned int rtcalm = readb(S3C2410_RTCALM); |
| 323 | unsigned int ticnt = readb (S3C2410_TICNT); |
| 324 | |
| 325 | seq_printf(seq, "alarm_IRQ\t: %s\n", |
| 326 | (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" ); |
| 327 | |
| 328 | seq_printf(seq, "periodic_IRQ\t: %s\n", |
| 329 | (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" ); |
| 330 | |
| 331 | seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq); |
| 332 | |
| 333 | return 0; |
| 334 | } |
| 335 | |
| 336 | static int s3c_rtc_open(struct device *dev) |
| 337 | { |
| 338 | struct platform_device *pdev = to_platform_device(dev); |
| 339 | struct rtc_device *rtc_dev = platform_get_drvdata(pdev); |
| 340 | int ret; |
| 341 | |
| 342 | ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq, |
| 343 | SA_INTERRUPT, "s3c2410-rtc alarm", rtc_dev); |
| 344 | |
| 345 | if (ret) { |
| 346 | dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret); |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq, |
| 351 | SA_INTERRUPT, "s3c2410-rtc tick", rtc_dev); |
| 352 | |
| 353 | if (ret) { |
| 354 | dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret); |
| 355 | goto tick_err; |
| 356 | } |
| 357 | |
| 358 | return ret; |
| 359 | |
| 360 | tick_err: |
| 361 | free_irq(s3c_rtc_alarmno, rtc_dev); |
| 362 | return ret; |
| 363 | } |
| 364 | |
| 365 | static void s3c_rtc_release(struct device *dev) |
| 366 | { |
| 367 | struct platform_device *pdev = to_platform_device(dev); |
| 368 | struct rtc_device *rtc_dev = platform_get_drvdata(pdev); |
| 369 | |
| 370 | /* do not clear AIE here, it may be needed for wake */ |
| 371 | |
| 372 | s3c_rtc_setpie(0); |
| 373 | free_irq(s3c_rtc_alarmno, rtc_dev); |
| 374 | free_irq(s3c_rtc_tickno, rtc_dev); |
| 375 | } |
| 376 | |
| 377 | static struct rtc_class_ops s3c_rtcops = { |
| 378 | .open = s3c_rtc_open, |
| 379 | .release = s3c_rtc_release, |
| 380 | .ioctl = s3c_rtc_ioctl, |
| 381 | .read_time = s3c_rtc_gettime, |
| 382 | .set_time = s3c_rtc_settime, |
| 383 | .read_alarm = s3c_rtc_getalarm, |
| 384 | .set_alarm = s3c_rtc_setalarm, |
| 385 | .proc = s3c_rtc_proc, |
| 386 | }; |
| 387 | |
| 388 | static void s3c_rtc_enable(struct platform_device *pdev, int en) |
| 389 | { |
| 390 | unsigned int tmp; |
| 391 | |
| 392 | if (s3c_rtc_base == NULL) |
| 393 | return; |
| 394 | |
| 395 | if (!en) { |
| 396 | tmp = readb(S3C2410_RTCCON); |
| 397 | writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON); |
| 398 | |
| 399 | tmp = readb(S3C2410_TICNT); |
| 400 | writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT); |
| 401 | } else { |
| 402 | /* re-enable the device, and check it is ok */ |
| 403 | |
| 404 | if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){ |
| 405 | dev_info(&pdev->dev, "rtc disabled, re-enabling\n"); |
| 406 | |
| 407 | tmp = readb(S3C2410_RTCCON); |
| 408 | writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON); |
| 409 | } |
| 410 | |
| 411 | if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){ |
| 412 | dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n"); |
| 413 | |
| 414 | tmp = readb(S3C2410_RTCCON); |
| 415 | writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON); |
| 416 | } |
| 417 | |
| 418 | if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){ |
| 419 | dev_info(&pdev->dev, "removing RTCCON_CLKRST\n"); |
| 420 | |
| 421 | tmp = readb(S3C2410_RTCCON); |
| 422 | writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON); |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | static int s3c_rtc_remove(struct platform_device *dev) |
| 428 | { |
| 429 | struct rtc_device *rtc = platform_get_drvdata(dev); |
| 430 | |
| 431 | platform_set_drvdata(dev, NULL); |
| 432 | rtc_device_unregister(rtc); |
| 433 | |
| 434 | s3c_rtc_setpie(0); |
| 435 | s3c_rtc_setaie(0); |
| 436 | |
| 437 | iounmap(s3c_rtc_base); |
| 438 | release_resource(s3c_rtc_mem); |
| 439 | kfree(s3c_rtc_mem); |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | static int s3c_rtc_probe(struct platform_device *pdev) |
| 445 | { |
| 446 | struct rtc_device *rtc; |
| 447 | struct resource *res; |
| 448 | int ret; |
| 449 | |
| 450 | pr_debug("%s: probe=%p\n", __FUNCTION__, pdev); |
| 451 | |
| 452 | /* find the IRQs */ |
| 453 | |
| 454 | s3c_rtc_tickno = platform_get_irq(pdev, 1); |
| 455 | if (s3c_rtc_tickno < 0) { |
| 456 | dev_err(&pdev->dev, "no irq for rtc tick\n"); |
| 457 | return -ENOENT; |
| 458 | } |
| 459 | |
| 460 | s3c_rtc_alarmno = platform_get_irq(pdev, 0); |
| 461 | if (s3c_rtc_alarmno < 0) { |
| 462 | dev_err(&pdev->dev, "no irq for alarm\n"); |
| 463 | return -ENOENT; |
| 464 | } |
| 465 | |
| 466 | pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n", |
| 467 | s3c_rtc_tickno, s3c_rtc_alarmno); |
| 468 | |
| 469 | /* get the memory region */ |
| 470 | |
| 471 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 472 | if (res == NULL) { |
| 473 | dev_err(&pdev->dev, "failed to get memory region resource\n"); |
| 474 | return -ENOENT; |
| 475 | } |
| 476 | |
| 477 | s3c_rtc_mem = request_mem_region(res->start, |
| 478 | res->end-res->start+1, |
| 479 | pdev->name); |
| 480 | |
| 481 | if (s3c_rtc_mem == NULL) { |
| 482 | dev_err(&pdev->dev, "failed to reserve memory region\n"); |
| 483 | ret = -ENOENT; |
| 484 | goto err_nores; |
| 485 | } |
| 486 | |
| 487 | s3c_rtc_base = ioremap(res->start, res->end - res->start + 1); |
| 488 | if (s3c_rtc_base == NULL) { |
| 489 | dev_err(&pdev->dev, "failed ioremap()\n"); |
| 490 | ret = -EINVAL; |
| 491 | goto err_nomap; |
| 492 | } |
| 493 | |
| 494 | /* check to see if everything is setup correctly */ |
| 495 | |
| 496 | s3c_rtc_enable(pdev, 1); |
| 497 | |
| 498 | pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON)); |
| 499 | |
| 500 | s3c_rtc_setfreq(s3c_rtc_freq); |
| 501 | |
| 502 | /* register RTC and exit */ |
| 503 | |
| 504 | rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops, |
| 505 | THIS_MODULE); |
| 506 | |
| 507 | if (IS_ERR(rtc)) { |
| 508 | dev_err(&pdev->dev, "cannot attach rtc\n"); |
| 509 | ret = PTR_ERR(rtc); |
| 510 | goto err_nortc; |
| 511 | } |
| 512 | |
| 513 | rtc->max_user_freq = 128; |
| 514 | |
| 515 | platform_set_drvdata(pdev, rtc); |
| 516 | return 0; |
| 517 | |
| 518 | err_nortc: |
| 519 | s3c_rtc_enable(pdev, 0); |
| 520 | iounmap(s3c_rtc_base); |
| 521 | |
| 522 | err_nomap: |
| 523 | release_resource(s3c_rtc_mem); |
| 524 | |
| 525 | err_nores: |
| 526 | return ret; |
| 527 | } |
| 528 | |
| 529 | #ifdef CONFIG_PM |
| 530 | |
| 531 | /* RTC Power management control */ |
| 532 | |
| 533 | static struct timespec s3c_rtc_delta; |
| 534 | |
| 535 | static int ticnt_save; |
| 536 | |
| 537 | static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state) |
| 538 | { |
| 539 | struct rtc_time tm; |
| 540 | struct timespec time; |
| 541 | |
| 542 | time.tv_nsec = 0; |
| 543 | |
| 544 | /* save TICNT for anyone using periodic interrupts */ |
| 545 | |
| 546 | ticnt_save = readb(S3C2410_TICNT); |
| 547 | |
| 548 | /* calculate time delta for suspend */ |
| 549 | |
| 550 | s3c_rtc_gettime(&pdev->dev, &tm); |
| 551 | rtc_tm_to_time(&tm, &time.tv_sec); |
| 552 | save_time_delta(&s3c_rtc_delta, &time); |
| 553 | s3c_rtc_enable(pdev, 0); |
| 554 | |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | static int s3c_rtc_resume(struct platform_device *pdev) |
| 559 | { |
| 560 | struct rtc_time tm; |
| 561 | struct timespec time; |
| 562 | |
| 563 | time.tv_nsec = 0; |
| 564 | |
| 565 | s3c_rtc_enable(pdev, 1); |
| 566 | s3c_rtc_gettime(&pdev->dev, &tm); |
| 567 | rtc_tm_to_time(&tm, &time.tv_sec); |
| 568 | restore_time_delta(&s3c_rtc_delta, &time); |
| 569 | |
| 570 | writeb(ticnt_save, S3C2410_TICNT); |
| 571 | return 0; |
| 572 | } |
| 573 | #else |
| 574 | #define s3c_rtc_suspend NULL |
| 575 | #define s3c_rtc_resume NULL |
| 576 | #endif |
| 577 | |
| 578 | static struct platform_driver s3c2410_rtcdrv = { |
| 579 | .probe = s3c_rtc_probe, |
| 580 | .remove = s3c_rtc_remove, |
| 581 | .suspend = s3c_rtc_suspend, |
| 582 | .resume = s3c_rtc_resume, |
| 583 | .driver = { |
| 584 | .name = "s3c2410-rtc", |
| 585 | .owner = THIS_MODULE, |
| 586 | }, |
| 587 | }; |
| 588 | |
| 589 | static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n"; |
| 590 | |
| 591 | static int __init s3c_rtc_init(void) |
| 592 | { |
| 593 | printk(banner); |
| 594 | return platform_driver_register(&s3c2410_rtcdrv); |
| 595 | } |
| 596 | |
| 597 | static void __exit s3c_rtc_exit(void) |
| 598 | { |
| 599 | platform_driver_unregister(&s3c2410_rtcdrv); |
| 600 | } |
| 601 | |
| 602 | module_init(s3c_rtc_init); |
| 603 | module_exit(s3c_rtc_exit); |
| 604 | |
| 605 | MODULE_DESCRIPTION("Samsung S3C RTC Driver"); |
| 606 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
| 607 | MODULE_LICENSE("GPL"); |