1/* 2 * Real Time Clock interface for XScale PXA27x and PXA3xx 3 * 4 * Copyright (C) 2008 Robert Jarzmik 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22#include <linux/init.h> 23#include <linux/platform_device.h> 24#include <linux/module.h> 25#include <linux/rtc.h> 26#include <linux/seq_file.h> 27#include <linux/interrupt.h> 28#include <linux/io.h> 29#include <linux/slab.h> 30#include <linux/of.h> 31#include <linux/of_device.h> 32 33#include <mach/hardware.h> 34 35#include "rtc-sa1100.h" 36 37#define RTC_DEF_DIVIDER (32768 - 1) 38#define RTC_DEF_TRIM 0 39#define MAXFREQ_PERIODIC 1000 40 41/* 42 * PXA Registers and bits definitions 43 */ 44#define RTSR_PICE (1 << 15) /* Periodic interrupt count enable */ 45#define RTSR_PIALE (1 << 14) /* Periodic interrupt Alarm enable */ 46#define RTSR_PIAL (1 << 13) /* Periodic interrupt detected */ 47#define RTSR_SWALE2 (1 << 11) /* RTC stopwatch alarm2 enable */ 48#define RTSR_SWAL2 (1 << 10) /* RTC stopwatch alarm2 detected */ 49#define RTSR_SWALE1 (1 << 9) /* RTC stopwatch alarm1 enable */ 50#define RTSR_SWAL1 (1 << 8) /* RTC stopwatch alarm1 detected */ 51#define RTSR_RDALE2 (1 << 7) /* RTC alarm2 enable */ 52#define RTSR_RDAL2 (1 << 6) /* RTC alarm2 detected */ 53#define RTSR_RDALE1 (1 << 5) /* RTC alarm1 enable */ 54#define RTSR_RDAL1 (1 << 4) /* RTC alarm1 detected */ 55#define RTSR_HZE (1 << 3) /* HZ interrupt enable */ 56#define RTSR_ALE (1 << 2) /* RTC alarm interrupt enable */ 57#define RTSR_HZ (1 << 1) /* HZ rising-edge detected */ 58#define RTSR_AL (1 << 0) /* RTC alarm detected */ 59#define RTSR_TRIG_MASK (RTSR_AL | RTSR_HZ | RTSR_RDAL1 | RTSR_RDAL2\ 60 | RTSR_SWAL1 | RTSR_SWAL2) 61#define RYxR_YEAR_S 9 62#define RYxR_YEAR_MASK (0xfff << RYxR_YEAR_S) 63#define RYxR_MONTH_S 5 64#define RYxR_MONTH_MASK (0xf << RYxR_MONTH_S) 65#define RYxR_DAY_MASK 0x1f 66#define RDxR_WOM_S 20 67#define RDxR_WOM_MASK (0x7 << RDxR_WOM_S) 68#define RDxR_DOW_S 17 69#define RDxR_DOW_MASK (0x7 << RDxR_DOW_S) 70#define RDxR_HOUR_S 12 71#define RDxR_HOUR_MASK (0x1f << RDxR_HOUR_S) 72#define RDxR_MIN_S 6 73#define RDxR_MIN_MASK (0x3f << RDxR_MIN_S) 74#define RDxR_SEC_MASK 0x3f 75 76#define RTSR 0x08 77#define RTTR 0x0c 78#define RDCR 0x10 79#define RYCR 0x14 80#define RDAR1 0x18 81#define RYAR1 0x1c 82#define RTCPICR 0x34 83#define PIAR 0x38 84 85#define rtc_readl(pxa_rtc, reg) \ 86 __raw_readl((pxa_rtc)->base + (reg)) 87#define rtc_writel(pxa_rtc, reg, value) \ 88 __raw_writel((value), (pxa_rtc)->base + (reg)) 89 90struct pxa_rtc { 91 struct sa1100_rtc sa1100_rtc; 92 struct resource *ress; 93 void __iomem *base; 94 struct rtc_device *rtc; 95 spinlock_t lock; /* Protects this structure */ 96}; 97 98 99static u32 ryxr_calc(struct rtc_time *tm) 100{ 101 return ((tm->tm_year + 1900) << RYxR_YEAR_S) 102 | ((tm->tm_mon + 1) << RYxR_MONTH_S) 103 | tm->tm_mday; 104} 105 106static u32 rdxr_calc(struct rtc_time *tm) 107{ 108 return ((((tm->tm_mday + 6) / 7) << RDxR_WOM_S) & RDxR_WOM_MASK) 109 | (((tm->tm_wday + 1) << RDxR_DOW_S) & RDxR_DOW_MASK) 110 | (tm->tm_hour << RDxR_HOUR_S) 111 | (tm->tm_min << RDxR_MIN_S) 112 | tm->tm_sec; 113} 114 115static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm) 116{ 117 tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900; 118 tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1; 119 tm->tm_mday = (rycr & RYxR_DAY_MASK); 120 tm->tm_wday = ((rycr & RDxR_DOW_MASK) >> RDxR_DOW_S) - 1; 121 tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S; 122 tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S; 123 tm->tm_sec = rdcr & RDxR_SEC_MASK; 124} 125 126static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask) 127{ 128 u32 rtsr; 129 130 rtsr = rtc_readl(pxa_rtc, RTSR); 131 rtsr &= ~RTSR_TRIG_MASK; 132 rtsr &= ~mask; 133 rtc_writel(pxa_rtc, RTSR, rtsr); 134} 135 136static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask) 137{ 138 u32 rtsr; 139 140 rtsr = rtc_readl(pxa_rtc, RTSR); 141 rtsr &= ~RTSR_TRIG_MASK; 142 rtsr |= mask; 143 rtc_writel(pxa_rtc, RTSR, rtsr); 144} 145 146static irqreturn_t pxa_rtc_irq(int irq, void *dev_id) 147{ 148 struct platform_device *pdev = to_platform_device(dev_id); 149 struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev); 150 u32 rtsr; 151 unsigned long events = 0; 152 153 spin_lock(&pxa_rtc->lock); 154 155 /* clear interrupt sources */ 156 rtsr = rtc_readl(pxa_rtc, RTSR); 157 rtc_writel(pxa_rtc, RTSR, rtsr); 158 159 /* temporary disable rtc interrupts */ 160 rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 | RTSR_PIALE | RTSR_HZE); 161 162 /* clear alarm interrupt if it has occurred */ 163 if (rtsr & RTSR_RDAL1) 164 rtsr &= ~RTSR_RDALE1; 165 166 /* update irq data & counter */ 167 if (rtsr & RTSR_RDAL1) 168 events |= RTC_AF | RTC_IRQF; 169 if (rtsr & RTSR_HZ) 170 events |= RTC_UF | RTC_IRQF; 171 if (rtsr & RTSR_PIAL) 172 events |= RTC_PF | RTC_IRQF; 173 174 rtc_update_irq(pxa_rtc->rtc, 1, events); 175 176 /* enable back rtc interrupts */ 177 rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK); 178 179 spin_unlock(&pxa_rtc->lock); 180 return IRQ_HANDLED; 181} 182 183static int pxa_rtc_open(struct device *dev) 184{ 185 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 186 int ret; 187 188 ret = request_irq(pxa_rtc->sa1100_rtc.irq_1hz, pxa_rtc_irq, 0, 189 "rtc 1Hz", dev); 190 if (ret < 0) { 191 dev_err(dev, "can't get irq %i, err %d\n", 192 pxa_rtc->sa1100_rtc.irq_1hz, ret); 193 goto err_irq_1Hz; 194 } 195 ret = request_irq(pxa_rtc->sa1100_rtc.irq_alarm, pxa_rtc_irq, 0, 196 "rtc Alrm", dev); 197 if (ret < 0) { 198 dev_err(dev, "can't get irq %i, err %d\n", 199 pxa_rtc->sa1100_rtc.irq_alarm, ret); 200 goto err_irq_Alrm; 201 } 202 203 return 0; 204 205err_irq_Alrm: 206 free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev); 207err_irq_1Hz: 208 return ret; 209} 210 211static void pxa_rtc_release(struct device *dev) 212{ 213 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 214 215 spin_lock_irq(&pxa_rtc->lock); 216 rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE); 217 spin_unlock_irq(&pxa_rtc->lock); 218 219 free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev); 220 free_irq(pxa_rtc->sa1100_rtc.irq_alarm, dev); 221} 222 223static int pxa_alarm_irq_enable(struct device *dev, unsigned int enabled) 224{ 225 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 226 227 spin_lock_irq(&pxa_rtc->lock); 228 229 if (enabled) 230 rtsr_set_bits(pxa_rtc, RTSR_RDALE1); 231 else 232 rtsr_clear_bits(pxa_rtc, RTSR_RDALE1); 233 234 spin_unlock_irq(&pxa_rtc->lock); 235 return 0; 236} 237 238static int pxa_rtc_read_time(struct device *dev, struct rtc_time *tm) 239{ 240 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 241 u32 rycr, rdcr; 242 243 rycr = rtc_readl(pxa_rtc, RYCR); 244 rdcr = rtc_readl(pxa_rtc, RDCR); 245 246 tm_calc(rycr, rdcr, tm); 247 return 0; 248} 249 250static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm) 251{ 252 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 253 254 rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm)); 255 rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm)); 256 257 return 0; 258} 259 260static int pxa_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 261{ 262 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 263 u32 rtsr, ryar, rdar; 264 265 ryar = rtc_readl(pxa_rtc, RYAR1); 266 rdar = rtc_readl(pxa_rtc, RDAR1); 267 tm_calc(ryar, rdar, &alrm->time); 268 269 rtsr = rtc_readl(pxa_rtc, RTSR); 270 alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0; 271 alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0; 272 return 0; 273} 274 275static int pxa_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 276{ 277 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 278 u32 rtsr; 279 280 spin_lock_irq(&pxa_rtc->lock); 281 282 rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time)); 283 rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time)); 284 285 rtsr = rtc_readl(pxa_rtc, RTSR); 286 if (alrm->enabled) 287 rtsr |= RTSR_RDALE1; 288 else 289 rtsr &= ~RTSR_RDALE1; 290 rtc_writel(pxa_rtc, RTSR, rtsr); 291 292 spin_unlock_irq(&pxa_rtc->lock); 293 294 return 0; 295} 296 297static int pxa_rtc_proc(struct device *dev, struct seq_file *seq) 298{ 299 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 300 301 seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR)); 302 seq_printf(seq, "update_IRQ\t: %s\n", 303 (rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no"); 304 seq_printf(seq, "periodic_IRQ\t: %s\n", 305 (rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no"); 306 seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR)); 307 308 return 0; 309} 310 311static const struct rtc_class_ops pxa_rtc_ops = { 312 .read_time = pxa_rtc_read_time, 313 .set_time = pxa_rtc_set_time, 314 .read_alarm = pxa_rtc_read_alarm, 315 .set_alarm = pxa_rtc_set_alarm, 316 .alarm_irq_enable = pxa_alarm_irq_enable, 317 .proc = pxa_rtc_proc, 318}; 319 320static int __init pxa_rtc_probe(struct platform_device *pdev) 321{ 322 struct device *dev = &pdev->dev; 323 struct pxa_rtc *pxa_rtc; 324 struct sa1100_rtc *sa1100_rtc; 325 int ret; 326 327 pxa_rtc = devm_kzalloc(dev, sizeof(*pxa_rtc), GFP_KERNEL); 328 if (!pxa_rtc) 329 return -ENOMEM; 330 sa1100_rtc = &pxa_rtc->sa1100_rtc; 331 332 spin_lock_init(&pxa_rtc->lock); 333 platform_set_drvdata(pdev, pxa_rtc); 334 335 pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0); 336 if (!pxa_rtc->ress) { 337 dev_err(dev, "No I/O memory resource defined\n"); 338 return -ENXIO; 339 } 340 341 sa1100_rtc->irq_1hz = platform_get_irq(pdev, 0); 342 if (sa1100_rtc->irq_1hz < 0) { 343 dev_err(dev, "No 1Hz IRQ resource defined\n"); 344 return -ENXIO; 345 } 346 sa1100_rtc->irq_alarm = platform_get_irq(pdev, 1); 347 if (sa1100_rtc->irq_alarm < 0) { 348 dev_err(dev, "No alarm IRQ resource defined\n"); 349 return -ENXIO; 350 } 351 pxa_rtc_open(dev); 352 pxa_rtc->base = devm_ioremap(dev, pxa_rtc->ress->start, 353 resource_size(pxa_rtc->ress)); 354 if (!pxa_rtc->base) { 355 dev_err(dev, "Unable to map pxa RTC I/O memory\n"); 356 return -ENOMEM; 357 } 358 359 sa1100_rtc->rcnr = pxa_rtc->base + 0x0; 360 sa1100_rtc->rtsr = pxa_rtc->base + 0x8; 361 sa1100_rtc->rtar = pxa_rtc->base + 0x4; 362 sa1100_rtc->rttr = pxa_rtc->base + 0xc; 363 ret = sa1100_rtc_init(pdev, sa1100_rtc); 364 if (!ret) { 365 dev_err(dev, "Unable to init SA1100 RTC sub-device\n"); 366 return ret; 367 } 368 369 rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE); 370 371 pxa_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pxa-rtc", 372 &pxa_rtc_ops, THIS_MODULE); 373 if (IS_ERR(pxa_rtc->rtc)) { 374 ret = PTR_ERR(pxa_rtc->rtc); 375 dev_err(dev, "Failed to register RTC device -> %d\n", ret); 376 return ret; 377 } 378 379 device_init_wakeup(dev, 1); 380 381 return 0; 382} 383 384static int __exit pxa_rtc_remove(struct platform_device *pdev) 385{ 386 struct device *dev = &pdev->dev; 387 388 pxa_rtc_release(dev); 389 return 0; 390} 391 392#ifdef CONFIG_OF 393static const struct of_device_id pxa_rtc_dt_ids[] = { 394 { .compatible = "marvell,pxa-rtc" }, 395 {} 396}; 397MODULE_DEVICE_TABLE(of, pxa_rtc_dt_ids); 398#endif 399 400#ifdef CONFIG_PM_SLEEP 401static int pxa_rtc_suspend(struct device *dev) 402{ 403 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 404 405 if (device_may_wakeup(dev)) 406 enable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm); 407 return 0; 408} 409 410static int pxa_rtc_resume(struct device *dev) 411{ 412 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 413 414 if (device_may_wakeup(dev)) 415 disable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm); 416 return 0; 417} 418#endif 419 420static SIMPLE_DEV_PM_OPS(pxa_rtc_pm_ops, pxa_rtc_suspend, pxa_rtc_resume); 421 422static struct platform_driver pxa_rtc_driver = { 423 .remove = __exit_p(pxa_rtc_remove), 424 .driver = { 425 .name = "pxa-rtc", 426 .of_match_table = of_match_ptr(pxa_rtc_dt_ids), 427 .pm = &pxa_rtc_pm_ops, 428 }, 429}; 430 431module_platform_driver_probe(pxa_rtc_driver, pxa_rtc_probe); 432 433MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); 434MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)"); 435MODULE_LICENSE("GPL"); 436MODULE_ALIAS("platform:pxa-rtc"); 437