Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Real Time Clock driver for Freescale MC13XXX PMIC |
| 3 | * |
| 4 | * (C) 2009 Sascha Hauer, Pengutronix |
| 5 | * (C) 2009 Uwe Kleine-Koenig, Pengutronix |
| 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 | |
| 12 | #include <linux/mfd/mc13xxx.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/rtc.h> |
| 18 | |
| 19 | #define DRIVER_NAME "mc13xxx-rtc" |
| 20 | |
| 21 | #define MC13XXX_RTCTOD 20 |
| 22 | #define MC13XXX_RTCTODA 21 |
| 23 | #define MC13XXX_RTCDAY 22 |
| 24 | #define MC13XXX_RTCDAYA 23 |
| 25 | |
| 26 | struct mc13xxx_rtc { |
| 27 | struct rtc_device *rtc; |
| 28 | struct mc13xxx *mc13xxx; |
| 29 | int valid; |
| 30 | }; |
| 31 | |
| 32 | static int mc13xxx_rtc_irq_enable_unlocked(struct device *dev, |
| 33 | unsigned int enabled, int irq) |
| 34 | { |
| 35 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); |
| 36 | int (*func)(struct mc13xxx *mc13xxx, int irq); |
| 37 | |
| 38 | if (!priv->valid) |
| 39 | return -ENODATA; |
| 40 | |
| 41 | func = enabled ? mc13xxx_irq_unmask : mc13xxx_irq_mask; |
| 42 | return func(priv->mc13xxx, irq); |
| 43 | } |
| 44 | |
| 45 | static int mc13xxx_rtc_irq_enable(struct device *dev, |
| 46 | unsigned int enabled, int irq) |
| 47 | { |
| 48 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); |
| 49 | int ret; |
| 50 | |
| 51 | mc13xxx_lock(priv->mc13xxx); |
| 52 | |
| 53 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, enabled, irq); |
| 54 | |
| 55 | mc13xxx_unlock(priv->mc13xxx); |
| 56 | |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | static int mc13xxx_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 61 | { |
| 62 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); |
| 63 | unsigned int seconds, days1, days2; |
| 64 | unsigned long s1970; |
| 65 | int ret; |
| 66 | |
| 67 | mc13xxx_lock(priv->mc13xxx); |
| 68 | |
| 69 | if (!priv->valid) { |
| 70 | ret = -ENODATA; |
| 71 | goto out; |
| 72 | } |
| 73 | |
| 74 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days1); |
| 75 | if (unlikely(ret)) |
| 76 | goto out; |
| 77 | |
| 78 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTOD, &seconds); |
| 79 | if (unlikely(ret)) |
| 80 | goto out; |
| 81 | |
| 82 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days2); |
| 83 | out: |
| 84 | mc13xxx_unlock(priv->mc13xxx); |
| 85 | |
| 86 | if (ret) |
| 87 | return ret; |
| 88 | |
| 89 | if (days2 == days1 + 1) { |
| 90 | if (seconds >= 86400 / 2) |
| 91 | days2 = days1; |
| 92 | else |
| 93 | days1 = days2; |
| 94 | } |
| 95 | |
| 96 | if (days1 != days2) |
| 97 | return -EIO; |
| 98 | |
| 99 | s1970 = days1 * 86400 + seconds; |
| 100 | |
| 101 | rtc_time_to_tm(s1970, tm); |
| 102 | |
| 103 | return rtc_valid_tm(tm); |
| 104 | } |
| 105 | |
| 106 | static int mc13xxx_rtc_set_mmss(struct device *dev, unsigned long secs) |
| 107 | { |
| 108 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); |
| 109 | unsigned int seconds, days; |
| 110 | unsigned int alarmseconds; |
| 111 | int ret; |
| 112 | |
| 113 | seconds = secs % 86400; |
| 114 | days = secs / 86400; |
| 115 | |
| 116 | mc13xxx_lock(priv->mc13xxx); |
| 117 | |
| 118 | /* |
| 119 | * temporarily invalidate alarm to prevent triggering it when the day is |
| 120 | * already updated while the time isn't yet. |
| 121 | */ |
| 122 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &alarmseconds); |
| 123 | if (unlikely(ret)) |
| 124 | goto out; |
| 125 | |
| 126 | if (alarmseconds < 86400) { |
| 127 | ret = mc13xxx_reg_write(priv->mc13xxx, |
| 128 | MC13XXX_RTCTODA, 0x1ffff); |
| 129 | if (unlikely(ret)) |
| 130 | goto out; |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * write seconds=0 to prevent a day switch between writing days |
| 135 | * and seconds below |
| 136 | */ |
| 137 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, 0); |
| 138 | if (unlikely(ret)) |
| 139 | goto out; |
| 140 | |
| 141 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAY, days); |
| 142 | if (unlikely(ret)) |
| 143 | goto out; |
| 144 | |
| 145 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTOD, seconds); |
| 146 | if (unlikely(ret)) |
| 147 | goto out; |
| 148 | |
| 149 | /* restore alarm */ |
| 150 | if (alarmseconds < 86400) { |
| 151 | ret = mc13xxx_reg_write(priv->mc13xxx, |
| 152 | MC13XXX_RTCTODA, alarmseconds); |
| 153 | if (unlikely(ret)) |
| 154 | goto out; |
| 155 | } |
| 156 | |
| 157 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_RTCRST); |
| 158 | if (unlikely(ret)) |
| 159 | goto out; |
| 160 | |
| 161 | ret = mc13xxx_irq_unmask(priv->mc13xxx, MC13XXX_IRQ_RTCRST); |
| 162 | out: |
| 163 | priv->valid = !ret; |
| 164 | |
| 165 | mc13xxx_unlock(priv->mc13xxx); |
| 166 | |
| 167 | return ret; |
| 168 | } |
| 169 | |
| 170 | static int mc13xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
| 171 | { |
| 172 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); |
| 173 | unsigned seconds, days; |
| 174 | unsigned long s1970; |
| 175 | int enabled, pending; |
| 176 | int ret; |
| 177 | |
| 178 | mc13xxx_lock(priv->mc13xxx); |
| 179 | |
| 180 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCTODA, &seconds); |
| 181 | if (unlikely(ret)) |
| 182 | goto out; |
| 183 | if (seconds >= 86400) { |
| 184 | ret = -ENODATA; |
| 185 | goto out; |
| 186 | } |
| 187 | |
| 188 | ret = mc13xxx_reg_read(priv->mc13xxx, MC13XXX_RTCDAY, &days); |
| 189 | if (unlikely(ret)) |
| 190 | goto out; |
| 191 | |
| 192 | ret = mc13xxx_irq_status(priv->mc13xxx, MC13XXX_IRQ_TODA, |
| 193 | &enabled, &pending); |
| 194 | |
| 195 | out: |
| 196 | mc13xxx_unlock(priv->mc13xxx); |
| 197 | |
| 198 | if (ret) |
| 199 | return ret; |
| 200 | |
| 201 | alarm->enabled = enabled; |
| 202 | alarm->pending = pending; |
| 203 | |
| 204 | s1970 = days * 86400 + seconds; |
| 205 | |
| 206 | rtc_time_to_tm(s1970, &alarm->time); |
| 207 | dev_dbg(dev, "%s: %lu\n", __func__, s1970); |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | static int mc13xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
| 213 | { |
| 214 | struct mc13xxx_rtc *priv = dev_get_drvdata(dev); |
| 215 | unsigned long s1970; |
| 216 | unsigned seconds, days; |
| 217 | int ret; |
| 218 | |
| 219 | mc13xxx_lock(priv->mc13xxx); |
| 220 | |
| 221 | /* disable alarm to prevent false triggering */ |
| 222 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, 0x1ffff); |
| 223 | if (unlikely(ret)) |
| 224 | goto out; |
| 225 | |
| 226 | ret = mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TODA); |
| 227 | if (unlikely(ret)) |
| 228 | goto out; |
| 229 | |
| 230 | ret = rtc_tm_to_time(&alarm->time, &s1970); |
| 231 | if (unlikely(ret)) |
| 232 | goto out; |
| 233 | |
| 234 | dev_dbg(dev, "%s: o%2.s %lu\n", __func__, alarm->enabled ? "n" : "ff", |
| 235 | s1970); |
| 236 | |
| 237 | ret = mc13xxx_rtc_irq_enable_unlocked(dev, alarm->enabled, |
| 238 | MC13XXX_IRQ_TODA); |
| 239 | if (unlikely(ret)) |
| 240 | goto out; |
| 241 | |
| 242 | seconds = s1970 % 86400; |
| 243 | days = s1970 / 86400; |
| 244 | |
| 245 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCDAYA, days); |
| 246 | if (unlikely(ret)) |
| 247 | goto out; |
| 248 | |
| 249 | ret = mc13xxx_reg_write(priv->mc13xxx, MC13XXX_RTCTODA, seconds); |
| 250 | |
| 251 | out: |
| 252 | mc13xxx_unlock(priv->mc13xxx); |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | static irqreturn_t mc13xxx_rtc_alarm_handler(int irq, void *dev) |
| 258 | { |
| 259 | struct mc13xxx_rtc *priv = dev; |
| 260 | struct mc13xxx *mc13xxx = priv->mc13xxx; |
| 261 | |
| 262 | dev_dbg(&priv->rtc->dev, "Alarm\n"); |
| 263 | |
| 264 | rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_AF); |
| 265 | |
| 266 | mc13xxx_irq_ack(mc13xxx, irq); |
| 267 | |
| 268 | return IRQ_HANDLED; |
| 269 | } |
| 270 | |
| 271 | static irqreturn_t mc13xxx_rtc_update_handler(int irq, void *dev) |
| 272 | { |
| 273 | struct mc13xxx_rtc *priv = dev; |
| 274 | struct mc13xxx *mc13xxx = priv->mc13xxx; |
| 275 | |
| 276 | dev_dbg(&priv->rtc->dev, "1HZ\n"); |
| 277 | |
| 278 | rtc_update_irq(priv->rtc, 1, RTC_IRQF | RTC_UF); |
| 279 | |
| 280 | mc13xxx_irq_ack(mc13xxx, irq); |
| 281 | |
| 282 | return IRQ_HANDLED; |
| 283 | } |
| 284 | |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 285 | static int mc13xxx_rtc_alarm_irq_enable(struct device *dev, |
| 286 | unsigned int enabled) |
| 287 | { |
| 288 | return mc13xxx_rtc_irq_enable(dev, enabled, MC13XXX_IRQ_TODA); |
| 289 | } |
| 290 | |
| 291 | static const struct rtc_class_ops mc13xxx_rtc_ops = { |
| 292 | .read_time = mc13xxx_rtc_read_time, |
| 293 | .set_mmss = mc13xxx_rtc_set_mmss, |
| 294 | .read_alarm = mc13xxx_rtc_read_alarm, |
| 295 | .set_alarm = mc13xxx_rtc_set_alarm, |
| 296 | .alarm_irq_enable = mc13xxx_rtc_alarm_irq_enable, |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 297 | }; |
| 298 | |
| 299 | static irqreturn_t mc13xxx_rtc_reset_handler(int irq, void *dev) |
| 300 | { |
| 301 | struct mc13xxx_rtc *priv = dev; |
| 302 | struct mc13xxx *mc13xxx = priv->mc13xxx; |
| 303 | |
| 304 | dev_dbg(&priv->rtc->dev, "RTCRST\n"); |
| 305 | priv->valid = 0; |
| 306 | |
| 307 | mc13xxx_irq_mask(mc13xxx, irq); |
| 308 | |
| 309 | return IRQ_HANDLED; |
| 310 | } |
| 311 | |
Uwe Kleine-König | db5cf8d | 2011-11-02 13:37:56 -0700 | [diff] [blame] | 312 | static int __init mc13xxx_rtc_probe(struct platform_device *pdev) |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 313 | { |
| 314 | int ret; |
| 315 | struct mc13xxx_rtc *priv; |
| 316 | struct mc13xxx *mc13xxx; |
| 317 | int rtcrst_pending; |
| 318 | |
Jingoo Han | a379fd2 | 2013-04-29 16:20:44 -0700 | [diff] [blame] | 319 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 320 | if (!priv) |
| 321 | return -ENOMEM; |
| 322 | |
| 323 | mc13xxx = dev_get_drvdata(pdev->dev.parent); |
| 324 | priv->mc13xxx = mc13xxx; |
| 325 | |
| 326 | platform_set_drvdata(pdev, priv); |
| 327 | |
| 328 | mc13xxx_lock(mc13xxx); |
| 329 | |
| 330 | ret = mc13xxx_irq_request(mc13xxx, MC13XXX_IRQ_RTCRST, |
| 331 | mc13xxx_rtc_reset_handler, DRIVER_NAME, priv); |
| 332 | if (ret) |
| 333 | goto err_reset_irq_request; |
| 334 | |
| 335 | ret = mc13xxx_irq_status(mc13xxx, MC13XXX_IRQ_RTCRST, |
| 336 | NULL, &rtcrst_pending); |
| 337 | if (ret) |
| 338 | goto err_reset_irq_status; |
| 339 | |
| 340 | priv->valid = !rtcrst_pending; |
| 341 | |
| 342 | ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_1HZ, |
| 343 | mc13xxx_rtc_update_handler, DRIVER_NAME, priv); |
| 344 | if (ret) |
| 345 | goto err_update_irq_request; |
| 346 | |
| 347 | ret = mc13xxx_irq_request_nounmask(mc13xxx, MC13XXX_IRQ_TODA, |
| 348 | mc13xxx_rtc_alarm_handler, DRIVER_NAME, priv); |
| 349 | if (ret) |
| 350 | goto err_alarm_irq_request; |
| 351 | |
Uwe Kleine-König | 156229b | 2011-05-06 11:57:47 +0200 | [diff] [blame] | 352 | mc13xxx_unlock(mc13xxx); |
| 353 | |
Jingoo Han | a379fd2 | 2013-04-29 16:20:44 -0700 | [diff] [blame] | 354 | priv->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
| 355 | &mc13xxx_rtc_ops, THIS_MODULE); |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 356 | if (IS_ERR(priv->rtc)) { |
| 357 | ret = PTR_ERR(priv->rtc); |
| 358 | |
Uwe Kleine-König | 156229b | 2011-05-06 11:57:47 +0200 | [diff] [blame] | 359 | mc13xxx_lock(mc13xxx); |
| 360 | |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 361 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv); |
| 362 | err_alarm_irq_request: |
| 363 | |
| 364 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_1HZ, priv); |
| 365 | err_update_irq_request: |
| 366 | |
| 367 | err_reset_irq_status: |
| 368 | |
| 369 | mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
| 370 | err_reset_irq_request: |
| 371 | |
Uwe Kleine-König | 156229b | 2011-05-06 11:57:47 +0200 | [diff] [blame] | 372 | mc13xxx_unlock(mc13xxx); |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 373 | } |
| 374 | |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 375 | return ret; |
| 376 | } |
| 377 | |
Alexander Shiyan | 77bf2ea | 2014-04-03 14:49:56 -0700 | [diff] [blame^] | 378 | static int mc13xxx_rtc_remove(struct platform_device *pdev) |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 379 | { |
| 380 | struct mc13xxx_rtc *priv = platform_get_drvdata(pdev); |
| 381 | |
| 382 | mc13xxx_lock(priv->mc13xxx); |
| 383 | |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 384 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TODA, priv); |
| 385 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_1HZ, priv); |
| 386 | mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_RTCRST, priv); |
| 387 | |
| 388 | mc13xxx_unlock(priv->mc13xxx); |
| 389 | |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 390 | return 0; |
| 391 | } |
| 392 | |
Axel Lin | a46481d | 2012-01-10 15:10:52 -0800 | [diff] [blame] | 393 | static const struct platform_device_id mc13xxx_rtc_idtable[] = { |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 394 | { |
| 395 | .name = "mc13783-rtc", |
| 396 | }, { |
| 397 | .name = "mc13892-rtc", |
Uwe Kleine-König | 19a1ac5 | 2012-07-30 14:41:52 -0700 | [diff] [blame] | 398 | }, { |
| 399 | .name = "mc34708-rtc", |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 400 | }, |
Uwe Kleine-König | 0f636fc | 2012-07-30 14:41:50 -0700 | [diff] [blame] | 401 | { /* sentinel */ } |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 402 | }; |
Uwe Kleine-König | 0f636fc | 2012-07-30 14:41:50 -0700 | [diff] [blame] | 403 | MODULE_DEVICE_TABLE(platform, mc13xxx_rtc_idtable); |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 404 | |
| 405 | static struct platform_driver mc13xxx_rtc_driver = { |
| 406 | .id_table = mc13xxx_rtc_idtable, |
Alexander Shiyan | 77bf2ea | 2014-04-03 14:49:56 -0700 | [diff] [blame^] | 407 | .remove = mc13xxx_rtc_remove, |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 408 | .driver = { |
| 409 | .name = DRIVER_NAME, |
| 410 | .owner = THIS_MODULE, |
| 411 | }, |
| 412 | }; |
| 413 | |
Jingoo Han | 09fb7ad | 2013-04-29 16:18:43 -0700 | [diff] [blame] | 414 | module_platform_driver_probe(mc13xxx_rtc_driver, &mc13xxx_rtc_probe); |
Uwe Kleine-König | 1c97872 | 2010-10-28 12:30:53 +0200 | [diff] [blame] | 415 | |
| 416 | MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); |
| 417 | MODULE_DESCRIPTION("RTC driver for Freescale MC13XXX PMIC"); |
| 418 | MODULE_LICENSE("GPL v2"); |