| 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 | s3c_rtc_enable_clk(info); |
| 153 | spin_lock_irq(&info->pie_lock); |
| 154 | |
| 155 | if (info->data->set_freq) |
| 156 | info->data->set_freq(info, freq); |
| 157 | |
| 158 | spin_unlock_irq(&info->pie_lock); |
| 159 | s3c_rtc_disable_clk(info); |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | /* Time read/write */ |
| 165 | static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) |
| 166 | { |
| 167 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 168 | unsigned int have_retried = 0; |
| 169 | |
| 170 | s3c_rtc_enable_clk(info); |
| 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 | s3c_rtc_disable_clk(info); |
| 198 | |
| 199 | rtc_tm->tm_year += 100; |
| 200 | |
| 201 | dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n", |
| 202 | 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, |
| 203 | rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); |
| 204 | |
| 205 | rtc_tm->tm_mon -= 1; |
| 206 | |
| 207 | return rtc_valid_tm(rtc_tm); |
| 208 | } |
| 209 | |
| 210 | static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) |
| 211 | { |
| 212 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 213 | int year = tm->tm_year - 100; |
| 214 | |
| 215 | dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n", |
| 216 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
| 217 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
| 218 | |
| 219 | /* we get around y2k by simply not supporting it */ |
| 220 | |
| 221 | if (year < 0 || year >= 100) { |
| 222 | dev_err(dev, "rtc only supports 100 years\n"); |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
| 226 | s3c_rtc_enable_clk(info); |
| 227 | |
| 228 | writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC); |
| 229 | writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN); |
| 230 | writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR); |
| 231 | writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE); |
| 232 | writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON); |
| 233 | writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR); |
| 234 | |
| 235 | s3c_rtc_disable_clk(info); |
| 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 241 | { |
| 242 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 243 | struct rtc_time *alm_tm = &alrm->time; |
| 244 | unsigned int alm_en; |
| 245 | |
| 246 | s3c_rtc_enable_clk(info); |
| 247 | |
| 248 | alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC); |
| 249 | alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN); |
| 250 | alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR); |
| 251 | alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON); |
| 252 | alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE); |
| 253 | alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR); |
| 254 | |
| 255 | alm_en = readb(info->base + S3C2410_RTCALM); |
| 256 | |
| 257 | s3c_rtc_disable_clk(info); |
| 258 | |
| 259 | alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0; |
| 260 | |
| 261 | dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n", |
| 262 | alm_en, |
| 263 | 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, |
| 264 | alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); |
| 265 | |
| 266 | /* decode the alarm enable field */ |
| 267 | if (alm_en & S3C2410_RTCALM_SECEN) |
| 268 | alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); |
| 269 | |
| 270 | if (alm_en & S3C2410_RTCALM_MINEN) |
| 271 | alm_tm->tm_min = bcd2bin(alm_tm->tm_min); |
| 272 | |
| 273 | if (alm_en & S3C2410_RTCALM_HOUREN) |
| 274 | alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); |
| 275 | |
| 276 | if (alm_en & S3C2410_RTCALM_DAYEN) |
| 277 | alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday); |
| 278 | |
| 279 | if (alm_en & S3C2410_RTCALM_MONEN) { |
| 280 | alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon); |
| 281 | alm_tm->tm_mon -= 1; |
| 282 | } |
| 283 | |
| 284 | if (alm_en & S3C2410_RTCALM_YEAREN) |
| 285 | alm_tm->tm_year = bcd2bin(alm_tm->tm_year); |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 291 | { |
| 292 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 293 | struct rtc_time *tm = &alrm->time; |
| 294 | unsigned int alrm_en; |
| 295 | int year = tm->tm_year - 100; |
| 296 | |
| 297 | dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n", |
| 298 | alrm->enabled, |
| 299 | 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, |
| 300 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
| 301 | |
| 302 | s3c_rtc_enable_clk(info); |
| 303 | |
| 304 | alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; |
| 305 | writeb(0x00, info->base + S3C2410_RTCALM); |
| 306 | |
| 307 | if (tm->tm_sec < 60 && tm->tm_sec >= 0) { |
| 308 | alrm_en |= S3C2410_RTCALM_SECEN; |
| 309 | writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC); |
| 310 | } |
| 311 | |
| 312 | if (tm->tm_min < 60 && tm->tm_min >= 0) { |
| 313 | alrm_en |= S3C2410_RTCALM_MINEN; |
| 314 | writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN); |
| 315 | } |
| 316 | |
| 317 | if (tm->tm_hour < 24 && tm->tm_hour >= 0) { |
| 318 | alrm_en |= S3C2410_RTCALM_HOUREN; |
| 319 | writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR); |
| 320 | } |
| 321 | |
| 322 | if (year < 100 && year >= 0) { |
| 323 | alrm_en |= S3C2410_RTCALM_YEAREN; |
| 324 | writeb(bin2bcd(year), info->base + S3C2410_ALMYEAR); |
| 325 | } |
| 326 | |
| 327 | if (tm->tm_mon < 12 && tm->tm_mon >= 0) { |
| 328 | alrm_en |= S3C2410_RTCALM_MONEN; |
| 329 | writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_ALMMON); |
| 330 | } |
| 331 | |
| 332 | if (tm->tm_mday <= 31 && tm->tm_mday >= 1) { |
| 333 | alrm_en |= S3C2410_RTCALM_DAYEN; |
| 334 | writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_ALMDATE); |
| 335 | } |
| 336 | |
| 337 | dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en); |
| 338 | |
| 339 | writeb(alrm_en, info->base + S3C2410_RTCALM); |
| 340 | |
| 341 | s3c_rtc_disable_clk(info); |
| 342 | |
| 343 | s3c_rtc_setaie(dev, alrm->enabled); |
| 344 | |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) |
| 349 | { |
| 350 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 351 | |
| 352 | s3c_rtc_enable_clk(info); |
| 353 | |
| 354 | if (info->data->enable_tick) |
| 355 | info->data->enable_tick(info, seq); |
| 356 | |
| 357 | s3c_rtc_disable_clk(info); |
| 358 | |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | static const struct rtc_class_ops s3c_rtcops = { |
| 363 | .read_time = s3c_rtc_gettime, |
| 364 | .set_time = s3c_rtc_settime, |
| 365 | .read_alarm = s3c_rtc_getalarm, |
| 366 | .set_alarm = s3c_rtc_setalarm, |
| 367 | .proc = s3c_rtc_proc, |
| 368 | .alarm_irq_enable = s3c_rtc_setaie, |
| 369 | }; |
| 370 | |
| 371 | static void s3c24xx_rtc_enable(struct s3c_rtc *info) |
| 372 | { |
| 373 | unsigned int con, tmp; |
| 374 | |
| 375 | con = readw(info->base + S3C2410_RTCCON); |
| 376 | /* re-enable the device, and check it is ok */ |
| 377 | if ((con & S3C2410_RTCCON_RTCEN) == 0) { |
| 378 | dev_info(info->dev, "rtc disabled, re-enabling\n"); |
| 379 | |
| 380 | tmp = readw(info->base + S3C2410_RTCCON); |
| 381 | writew(tmp | S3C2410_RTCCON_RTCEN, |
| 382 | info->base + S3C2410_RTCCON); |
| 383 | } |
| 384 | |
| 385 | if (con & S3C2410_RTCCON_CNTSEL) { |
| 386 | dev_info(info->dev, "removing RTCCON_CNTSEL\n"); |
| 387 | |
| 388 | tmp = readw(info->base + S3C2410_RTCCON); |
| 389 | writew(tmp & ~S3C2410_RTCCON_CNTSEL, |
| 390 | info->base + S3C2410_RTCCON); |
| 391 | } |
| 392 | |
| 393 | if (con & S3C2410_RTCCON_CLKRST) { |
| 394 | dev_info(info->dev, "removing RTCCON_CLKRST\n"); |
| 395 | |
| 396 | tmp = readw(info->base + S3C2410_RTCCON); |
| 397 | writew(tmp & ~S3C2410_RTCCON_CLKRST, |
| 398 | info->base + S3C2410_RTCCON); |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | static void s3c24xx_rtc_disable(struct s3c_rtc *info) |
| 403 | { |
| 404 | unsigned int con; |
| 405 | |
| 406 | con = readw(info->base + S3C2410_RTCCON); |
| 407 | con &= ~S3C2410_RTCCON_RTCEN; |
| 408 | writew(con, info->base + S3C2410_RTCCON); |
| 409 | |
| 410 | con = readb(info->base + S3C2410_TICNT); |
| 411 | con &= ~S3C2410_TICNT_ENABLE; |
| 412 | writeb(con, info->base + S3C2410_TICNT); |
| 413 | } |
| 414 | |
| 415 | static void s3c6410_rtc_disable(struct s3c_rtc *info) |
| 416 | { |
| 417 | unsigned int con; |
| 418 | |
| 419 | con = readw(info->base + S3C2410_RTCCON); |
| 420 | con &= ~S3C64XX_RTCCON_TICEN; |
| 421 | con &= ~S3C2410_RTCCON_RTCEN; |
| 422 | writew(con, info->base + S3C2410_RTCCON); |
| 423 | } |
| 424 | |
| 425 | static int s3c_rtc_remove(struct platform_device *pdev) |
| 426 | { |
| 427 | struct s3c_rtc *info = platform_get_drvdata(pdev); |
| 428 | |
| 429 | s3c_rtc_setaie(info->dev, 0); |
| 430 | |
| 431 | if (info->data->needs_src_clk) |
| 432 | clk_unprepare(info->rtc_src_clk); |
| 433 | clk_unprepare(info->rtc_clk); |
| 434 | |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static const struct of_device_id s3c_rtc_dt_match[]; |
| 439 | |
| 440 | static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev) |
| 441 | { |
| 442 | const struct of_device_id *match; |
| 443 | |
| 444 | match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node); |
| 445 | return (struct s3c_rtc_data *)match->data; |
| 446 | } |
| 447 | |
| 448 | static int s3c_rtc_probe(struct platform_device *pdev) |
| 449 | { |
| 450 | struct s3c_rtc *info = NULL; |
| 451 | struct rtc_time rtc_tm; |
| 452 | struct resource *res; |
| 453 | int ret; |
| 454 | |
| 455 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); |
| 456 | if (!info) |
| 457 | return -ENOMEM; |
| 458 | |
| 459 | /* find the IRQs */ |
| 460 | info->irq_tick = platform_get_irq(pdev, 1); |
| 461 | if (info->irq_tick < 0) { |
| 462 | dev_err(&pdev->dev, "no irq for rtc tick\n"); |
| 463 | return info->irq_tick; |
| 464 | } |
| 465 | |
| 466 | info->dev = &pdev->dev; |
| 467 | info->data = s3c_rtc_get_data(pdev); |
| 468 | if (!info->data) { |
| 469 | dev_err(&pdev->dev, "failed getting s3c_rtc_data\n"); |
| 470 | return -EINVAL; |
| 471 | } |
| 472 | spin_lock_init(&info->pie_lock); |
| 473 | spin_lock_init(&info->alarm_clk_lock); |
| 474 | |
| 475 | platform_set_drvdata(pdev, info); |
| 476 | |
| 477 | info->irq_alarm = platform_get_irq(pdev, 0); |
| 478 | if (info->irq_alarm < 0) { |
| 479 | dev_err(&pdev->dev, "no irq for alarm\n"); |
| 480 | return info->irq_alarm; |
| 481 | } |
| 482 | |
| 483 | dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n", |
| 484 | info->irq_tick, info->irq_alarm); |
| 485 | |
| 486 | /* get the memory region */ |
| 487 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 488 | info->base = devm_ioremap_resource(&pdev->dev, res); |
| 489 | if (IS_ERR(info->base)) |
| 490 | return PTR_ERR(info->base); |
| 491 | |
| 492 | info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); |
| 493 | if (IS_ERR(info->rtc_clk)) { |
| 494 | ret = PTR_ERR(info->rtc_clk); |
| 495 | if (ret != -EPROBE_DEFER) |
| 496 | dev_err(&pdev->dev, "failed to find rtc clock\n"); |
| 497 | else |
| 498 | dev_dbg(&pdev->dev, "probe deferred due to missing rtc clk\n"); |
| 499 | return ret; |
| 500 | } |
| 501 | clk_prepare_enable(info->rtc_clk); |
| 502 | |
| 503 | if (info->data->needs_src_clk) { |
| 504 | info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); |
| 505 | if (IS_ERR(info->rtc_src_clk)) { |
| 506 | ret = PTR_ERR(info->rtc_src_clk); |
| 507 | if (ret != -EPROBE_DEFER) |
| 508 | dev_err(&pdev->dev, |
| 509 | "failed to find rtc source clock\n"); |
| 510 | else |
| 511 | dev_dbg(&pdev->dev, |
| 512 | "probe deferred due to missing rtc src clk\n"); |
| 513 | clk_disable_unprepare(info->rtc_clk); |
| 514 | return ret; |
| 515 | } |
| 516 | clk_prepare_enable(info->rtc_src_clk); |
| 517 | } |
| 518 | |
| 519 | /* check to see if everything is setup correctly */ |
| 520 | if (info->data->enable) |
| 521 | info->data->enable(info); |
| 522 | |
| 523 | dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", |
| 524 | readw(info->base + S3C2410_RTCCON)); |
| 525 | |
| 526 | device_init_wakeup(&pdev->dev, 1); |
| 527 | |
| 528 | /* Check RTC Time */ |
| 529 | if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) { |
| 530 | rtc_tm.tm_year = 100; |
| 531 | rtc_tm.tm_mon = 0; |
| 532 | rtc_tm.tm_mday = 1; |
| 533 | rtc_tm.tm_hour = 0; |
| 534 | rtc_tm.tm_min = 0; |
| 535 | rtc_tm.tm_sec = 0; |
| 536 | |
| 537 | s3c_rtc_settime(&pdev->dev, &rtc_tm); |
| 538 | |
| 539 | dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); |
| 540 | } |
| 541 | |
| 542 | /* register RTC and exit */ |
| 543 | info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, |
| 544 | THIS_MODULE); |
| 545 | if (IS_ERR(info->rtc)) { |
| 546 | dev_err(&pdev->dev, "cannot attach rtc\n"); |
| 547 | ret = PTR_ERR(info->rtc); |
| 548 | goto err_nortc; |
| 549 | } |
| 550 | |
| 551 | ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, |
| 552 | 0, "s3c2410-rtc alarm", info); |
| 553 | if (ret) { |
| 554 | dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); |
| 555 | goto err_nortc; |
| 556 | } |
| 557 | |
| 558 | ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, |
| 559 | 0, "s3c2410-rtc tick", info); |
| 560 | if (ret) { |
| 561 | dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); |
| 562 | goto err_nortc; |
| 563 | } |
| 564 | |
| 565 | if (info->data->select_tick_clk) |
| 566 | info->data->select_tick_clk(info); |
| 567 | |
| 568 | s3c_rtc_setfreq(info, 1); |
| 569 | |
| 570 | return 0; |
| 571 | |
| 572 | err_nortc: |
| 573 | if (info->data->disable) |
| 574 | info->data->disable(info); |
| 575 | |
| 576 | if (info->data->needs_src_clk) |
| 577 | clk_disable_unprepare(info->rtc_src_clk); |
| 578 | clk_disable_unprepare(info->rtc_clk); |
| 579 | |
| 580 | return ret; |
| 581 | } |
| 582 | |
| 583 | #ifdef CONFIG_PM_SLEEP |
| 584 | |
| 585 | static int s3c_rtc_suspend(struct device *dev) |
| 586 | { |
| 587 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 588 | |
| 589 | s3c_rtc_enable_clk(info); |
| 590 | |
| 591 | /* save TICNT for anyone using periodic interrupts */ |
| 592 | if (info->data->save_tick_cnt) |
| 593 | info->data->save_tick_cnt(info); |
| 594 | |
| 595 | if (info->data->disable) |
| 596 | info->data->disable(info); |
| 597 | |
| 598 | if (device_may_wakeup(dev) && !info->wake_en) { |
| 599 | if (enable_irq_wake(info->irq_alarm) == 0) |
| 600 | info->wake_en = true; |
| 601 | else |
| 602 | dev_err(dev, "enable_irq_wake failed\n"); |
| 603 | } |
| 604 | |
| 605 | return 0; |
| 606 | } |
| 607 | |
| 608 | static int s3c_rtc_resume(struct device *dev) |
| 609 | { |
| 610 | struct s3c_rtc *info = dev_get_drvdata(dev); |
| 611 | |
| 612 | if (info->data->enable) |
| 613 | info->data->enable(info); |
| 614 | |
| 615 | if (info->data->restore_tick_cnt) |
| 616 | info->data->restore_tick_cnt(info); |
| 617 | |
| 618 | s3c_rtc_disable_clk(info); |
| 619 | |
| 620 | if (device_may_wakeup(dev) && info->wake_en) { |
| 621 | disable_irq_wake(info->irq_alarm); |
| 622 | info->wake_en = false; |
| 623 | } |
| 624 | |
| 625 | return 0; |
| 626 | } |
| 627 | #endif |
| 628 | static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); |
| 629 | |
| 630 | static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) |
| 631 | { |
| 632 | rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); |
| 633 | } |
| 634 | |
| 635 | static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) |
| 636 | { |
| 637 | rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); |
| 638 | writeb(mask, info->base + S3C2410_INTP); |
| 639 | } |
| 640 | |
| 641 | static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) |
| 642 | { |
| 643 | unsigned int tmp = 0; |
| 644 | int val; |
| 645 | |
| 646 | tmp = readb(info->base + S3C2410_TICNT); |
| 647 | tmp &= S3C2410_TICNT_ENABLE; |
| 648 | |
| 649 | val = (info->rtc->max_user_freq / freq) - 1; |
| 650 | tmp |= val; |
| 651 | |
| 652 | writel(tmp, info->base + S3C2410_TICNT); |
| 653 | } |
| 654 | |
| 655 | static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) |
| 656 | { |
| 657 | unsigned int tmp = 0; |
| 658 | int val; |
| 659 | |
| 660 | tmp = readb(info->base + S3C2410_TICNT); |
| 661 | tmp &= S3C2410_TICNT_ENABLE; |
| 662 | |
| 663 | val = (info->rtc->max_user_freq / freq) - 1; |
| 664 | |
| 665 | tmp |= S3C2443_TICNT_PART(val); |
| 666 | writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); |
| 667 | |
| 668 | writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); |
| 669 | |
| 670 | writel(tmp, info->base + S3C2410_TICNT); |
| 671 | } |
| 672 | |
| 673 | static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) |
| 674 | { |
| 675 | unsigned int tmp = 0; |
| 676 | int val; |
| 677 | |
| 678 | tmp = readb(info->base + S3C2410_TICNT); |
| 679 | tmp &= S3C2410_TICNT_ENABLE; |
| 680 | |
| 681 | val = (info->rtc->max_user_freq / freq) - 1; |
| 682 | |
| 683 | tmp |= S3C2443_TICNT_PART(val); |
| 684 | writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); |
| 685 | |
| 686 | writel(tmp, info->base + S3C2410_TICNT); |
| 687 | } |
| 688 | |
| 689 | static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) |
| 690 | { |
| 691 | int val; |
| 692 | |
| 693 | val = (info->rtc->max_user_freq / freq) - 1; |
| 694 | writel(val, info->base + S3C2410_TICNT); |
| 695 | } |
| 696 | |
| 697 | static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) |
| 698 | { |
| 699 | unsigned int ticnt; |
| 700 | |
| 701 | ticnt = readb(info->base + S3C2410_TICNT); |
| 702 | ticnt &= S3C2410_TICNT_ENABLE; |
| 703 | |
| 704 | seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); |
| 705 | } |
| 706 | |
| 707 | static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) |
| 708 | { |
| 709 | unsigned int con; |
| 710 | |
| 711 | con = readw(info->base + S3C2410_RTCCON); |
| 712 | con |= S3C2443_RTCCON_TICSEL; |
| 713 | writew(con, info->base + S3C2410_RTCCON); |
| 714 | } |
| 715 | |
| 716 | static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) |
| 717 | { |
| 718 | unsigned int ticnt; |
| 719 | |
| 720 | ticnt = readw(info->base + S3C2410_RTCCON); |
| 721 | ticnt &= S3C64XX_RTCCON_TICEN; |
| 722 | |
| 723 | seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); |
| 724 | } |
| 725 | |
| 726 | static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) |
| 727 | { |
| 728 | info->ticnt_save = readb(info->base + S3C2410_TICNT); |
| 729 | } |
| 730 | |
| 731 | static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) |
| 732 | { |
| 733 | writeb(info->ticnt_save, info->base + S3C2410_TICNT); |
| 734 | } |
| 735 | |
| 736 | static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) |
| 737 | { |
| 738 | info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); |
| 739 | info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; |
| 740 | info->ticnt_save = readl(info->base + S3C2410_TICNT); |
| 741 | } |
| 742 | |
| 743 | static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) |
| 744 | { |
| 745 | unsigned int con; |
| 746 | |
| 747 | writel(info->ticnt_save, info->base + S3C2410_TICNT); |
| 748 | if (info->ticnt_en_save) { |
| 749 | con = readw(info->base + S3C2410_RTCCON); |
| 750 | writew(con | info->ticnt_en_save, |
| 751 | info->base + S3C2410_RTCCON); |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | static struct s3c_rtc_data const s3c2410_rtc_data = { |
| 756 | .max_user_freq = 128, |
| 757 | .irq_handler = s3c24xx_rtc_irq, |
| 758 | .set_freq = s3c2410_rtc_setfreq, |
| 759 | .enable_tick = s3c24xx_rtc_enable_tick, |
| 760 | .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, |
| 761 | .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, |
| 762 | .enable = s3c24xx_rtc_enable, |
| 763 | .disable = s3c24xx_rtc_disable, |
| 764 | }; |
| 765 | |
| 766 | static struct s3c_rtc_data const s3c2416_rtc_data = { |
| 767 | .max_user_freq = 32768, |
| 768 | .irq_handler = s3c24xx_rtc_irq, |
| 769 | .set_freq = s3c2416_rtc_setfreq, |
| 770 | .enable_tick = s3c24xx_rtc_enable_tick, |
| 771 | .select_tick_clk = s3c2416_rtc_select_tick_clk, |
| 772 | .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, |
| 773 | .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, |
| 774 | .enable = s3c24xx_rtc_enable, |
| 775 | .disable = s3c24xx_rtc_disable, |
| 776 | }; |
| 777 | |
| 778 | static struct s3c_rtc_data const s3c2443_rtc_data = { |
| 779 | .max_user_freq = 32768, |
| 780 | .irq_handler = s3c24xx_rtc_irq, |
| 781 | .set_freq = s3c2443_rtc_setfreq, |
| 782 | .enable_tick = s3c24xx_rtc_enable_tick, |
| 783 | .select_tick_clk = s3c2416_rtc_select_tick_clk, |
| 784 | .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, |
| 785 | .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, |
| 786 | .enable = s3c24xx_rtc_enable, |
| 787 | .disable = s3c24xx_rtc_disable, |
| 788 | }; |
| 789 | |
| 790 | static struct s3c_rtc_data const s3c6410_rtc_data = { |
| 791 | .max_user_freq = 32768, |
| 792 | .needs_src_clk = true, |
| 793 | .irq_handler = s3c6410_rtc_irq, |
| 794 | .set_freq = s3c6410_rtc_setfreq, |
| 795 | .enable_tick = s3c6410_rtc_enable_tick, |
| 796 | .save_tick_cnt = s3c6410_rtc_save_tick_cnt, |
| 797 | .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, |
| 798 | .enable = s3c24xx_rtc_enable, |
| 799 | .disable = s3c6410_rtc_disable, |
| 800 | }; |
| 801 | |
| 802 | static const struct of_device_id s3c_rtc_dt_match[] = { |
| 803 | { |
| 804 | .compatible = "samsung,s3c2410-rtc", |
| 805 | .data = (void *)&s3c2410_rtc_data, |
| 806 | }, { |
| 807 | .compatible = "samsung,s3c2416-rtc", |
| 808 | .data = (void *)&s3c2416_rtc_data, |
| 809 | }, { |
| 810 | .compatible = "samsung,s3c2443-rtc", |
| 811 | .data = (void *)&s3c2443_rtc_data, |
| 812 | }, { |
| 813 | .compatible = "samsung,s3c6410-rtc", |
| 814 | .data = (void *)&s3c6410_rtc_data, |
| 815 | }, { |
| 816 | .compatible = "samsung,exynos3250-rtc", |
| 817 | .data = (void *)&s3c6410_rtc_data, |
| 818 | }, |
| 819 | { /* sentinel */ }, |
| 820 | }; |
| 821 | MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); |
| 822 | |
| 823 | static struct platform_driver s3c_rtc_driver = { |
| 824 | .probe = s3c_rtc_probe, |
| 825 | .remove = s3c_rtc_remove, |
| 826 | .driver = { |
| 827 | .name = "s3c-rtc", |
| 828 | .pm = &s3c_rtc_pm_ops, |
| 829 | .of_match_table = of_match_ptr(s3c_rtc_dt_match), |
| 830 | }, |
| 831 | }; |
| 832 | module_platform_driver(s3c_rtc_driver); |
| 833 | |
| 834 | MODULE_DESCRIPTION("Samsung S3C RTC Driver"); |
| 835 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
| 836 | MODULE_LICENSE("GPL"); |
| 837 | MODULE_ALIAS("platform:s3c2410-rtc"); |