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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 | /* * Real-time clock driver for MPC5121 * * Copyright 2007, Domen Puncer <domen.puncer@telargo.com> * Copyright 2008, Freescale Semiconductor, Inc. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/init.h> #include <linux/module.h> #include <linux/rtc.h> #include <linux/of_device.h> #include <linux/of_platform.h> #include <linux/io.h> #include <linux/slab.h> struct mpc5121_rtc_regs { u8 set_time; /* RTC + 0x00 */ u8 hour_set; /* RTC + 0x01 */ u8 minute_set; /* RTC + 0x02 */ u8 second_set; /* RTC + 0x03 */ u8 set_date; /* RTC + 0x04 */ u8 month_set; /* RTC + 0x05 */ u8 weekday_set; /* RTC + 0x06 */ u8 date_set; /* RTC + 0x07 */ u8 write_sw; /* RTC + 0x08 */ u8 sw_set; /* RTC + 0x09 */ u16 year_set; /* RTC + 0x0a */ u8 alm_enable; /* RTC + 0x0c */ u8 alm_hour_set; /* RTC + 0x0d */ u8 alm_min_set; /* RTC + 0x0e */ u8 int_enable; /* RTC + 0x0f */ u8 reserved1; u8 hour; /* RTC + 0x11 */ u8 minute; /* RTC + 0x12 */ u8 second; /* RTC + 0x13 */ u8 month; /* RTC + 0x14 */ u8 wday_mday; /* RTC + 0x15 */ u16 year; /* RTC + 0x16 */ u8 int_alm; /* RTC + 0x18 */ u8 int_sw; /* RTC + 0x19 */ u8 alm_status; /* RTC + 0x1a */ u8 sw_minute; /* RTC + 0x1b */ u8 bus_error_1; /* RTC + 0x1c */ u8 int_day; /* RTC + 0x1d */ u8 int_min; /* RTC + 0x1e */ u8 int_sec; /* RTC + 0x1f */ /* * target_time: * intended to be used for hibernation but hibernation * does not work on silicon rev 1.5 so use it for non-volatile * storage of offset between the actual_time register and linux * time */ u32 target_time; /* RTC + 0x20 */ /* * actual_time: * readonly time since VBAT_RTC was last connected */ u32 actual_time; /* RTC + 0x24 */ u32 keep_alive; /* RTC + 0x28 */ }; struct mpc5121_rtc_data { unsigned irq; unsigned irq_periodic; struct mpc5121_rtc_regs __iomem *regs; struct rtc_device *rtc; struct rtc_wkalrm wkalarm; }; /* * Update second/minute/hour registers. * * This is just so alarm will work. */ static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs, struct rtc_time *tm) { out_8(®s->second_set, tm->tm_sec); out_8(®s->minute_set, tm->tm_min); out_8(®s->hour_set, tm->tm_hour); /* set time sequence */ out_8(®s->set_time, 0x1); out_8(®s->set_time, 0x3); out_8(®s->set_time, 0x1); out_8(®s->set_time, 0x0); } static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; unsigned long now; /* * linux time is actual_time plus the offset saved in target_time */ now = in_be32(®s->actual_time) + in_be32(®s->target_time); rtc_time_to_tm(now, tm); /* * update second minute hour registers * so alarms will work */ mpc5121_rtc_update_smh(regs, tm); return rtc_valid_tm(tm); } static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; int ret; unsigned long now; /* * The actual_time register is read only so we write the offset * between it and linux time to the target_time register. */ ret = rtc_tm_to_time(tm, &now); if (ret == 0) out_be32(®s->target_time, now - in_be32(®s->actual_time)); /* * update second minute hour registers * so alarms will work */ mpc5121_rtc_update_smh(regs, tm); return 0; } static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) { struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; *alarm = rtc->wkalarm; alarm->pending = in_8(®s->alm_status); return 0; } static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) { struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; /* * the alarm has no seconds so deal with it */ if (alarm->time.tm_sec) { alarm->time.tm_sec = 0; alarm->time.tm_min++; if (alarm->time.tm_min >= 60) { alarm->time.tm_min = 0; alarm->time.tm_hour++; if (alarm->time.tm_hour >= 24) alarm->time.tm_hour = 0; } } alarm->time.tm_mday = -1; alarm->time.tm_mon = -1; alarm->time.tm_year = -1; out_8(®s->alm_min_set, alarm->time.tm_min); out_8(®s->alm_hour_set, alarm->time.tm_hour); out_8(®s->alm_enable, alarm->enabled); rtc->wkalarm = *alarm; return 0; } static irqreturn_t mpc5121_rtc_handler(int irq, void *dev) { struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; if (in_8(®s->int_alm)) { /* acknowledge and clear status */ out_8(®s->int_alm, 1); out_8(®s->alm_status, 1); rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF); return IRQ_HANDLED; } return IRQ_NONE; } static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev) { struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) { /* acknowledge */ out_8(®s->int_sec, 1); rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF); return IRQ_HANDLED; } return IRQ_NONE; } static int mpc5121_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; int val; if (enabled) val = 1; else val = 0; out_8(®s->alm_enable, val); rtc->wkalarm.enabled = val; return 0; } static const struct rtc_class_ops mpc5121_rtc_ops = { .read_time = mpc5121_rtc_read_time, .set_time = mpc5121_rtc_set_time, .read_alarm = mpc5121_rtc_read_alarm, .set_alarm = mpc5121_rtc_set_alarm, .alarm_irq_enable = mpc5121_rtc_alarm_irq_enable, }; static int __devinit mpc5121_rtc_probe(struct platform_device *op) { struct mpc5121_rtc_data *rtc; int err = 0; u32 ka; rtc = kzalloc(sizeof(*rtc), GFP_KERNEL); if (!rtc) return -ENOMEM; rtc->regs = of_iomap(op->dev.of_node, 0); if (!rtc->regs) { dev_err(&op->dev, "%s: couldn't map io space\n", __func__); err = -ENOSYS; goto out_free; } device_init_wakeup(&op->dev, 1); dev_set_drvdata(&op->dev, rtc); rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1); err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED, "mpc5121-rtc", &op->dev); if (err) { dev_err(&op->dev, "%s: could not request irq: %i\n", __func__, rtc->irq); goto out_dispose; } rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0); err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd, IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev); if (err) { dev_err(&op->dev, "%s: could not request irq: %i\n", __func__, rtc->irq_periodic); goto out_dispose2; } ka = in_be32(&rtc->regs->keep_alive); if (ka & 0x02) { dev_warn(&op->dev, "mpc5121-rtc: Battery or oscillator failure!\n"); out_be32(&rtc->regs->keep_alive, ka); } rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev, &mpc5121_rtc_ops, THIS_MODULE); if (IS_ERR(rtc->rtc)) { err = PTR_ERR(rtc->rtc); goto out_free_irq; } return 0; out_free_irq: free_irq(rtc->irq_periodic, &op->dev); out_dispose2: irq_dispose_mapping(rtc->irq_periodic); free_irq(rtc->irq, &op->dev); out_dispose: irq_dispose_mapping(rtc->irq); iounmap(rtc->regs); out_free: kfree(rtc); return err; } static int __devexit mpc5121_rtc_remove(struct platform_device *op) { struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev); struct mpc5121_rtc_regs __iomem *regs = rtc->regs; /* disable interrupt, so there are no nasty surprises */ out_8(®s->alm_enable, 0); out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1); rtc_device_unregister(rtc->rtc); iounmap(rtc->regs); free_irq(rtc->irq, &op->dev); free_irq(rtc->irq_periodic, &op->dev); irq_dispose_mapping(rtc->irq); irq_dispose_mapping(rtc->irq_periodic); dev_set_drvdata(&op->dev, NULL); kfree(rtc); return 0; } static struct of_device_id mpc5121_rtc_match[] __devinitdata = { { .compatible = "fsl,mpc5121-rtc", }, {}, }; static struct platform_driver mpc5121_rtc_driver = { .driver = { .name = "mpc5121-rtc", .owner = THIS_MODULE, .of_match_table = mpc5121_rtc_match, }, .probe = mpc5121_rtc_probe, .remove = __devexit_p(mpc5121_rtc_remove), }; static int __init mpc5121_rtc_init(void) { return platform_driver_register(&mpc5121_rtc_driver); } module_init(mpc5121_rtc_init); static void __exit mpc5121_rtc_exit(void) { platform_driver_unregister(&mpc5121_rtc_driver); } module_exit(mpc5121_rtc_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>"); |