1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Real Time Clock interface for XScale PXA27x and PXA3xx 4 * 5 * Copyright (C) 2008 Robert Jarzmik 6 */ 7 8 #include <linux/init.h> 9 #include <linux/platform_device.h> 10 #include <linux/module.h> 11 #include <linux/rtc.h> 12 #include <linux/seq_file.h> 13 #include <linux/interrupt.h> 14 #include <linux/io.h> 15 #include <linux/slab.h> 16 #include <linux/of.h> 17 #include <linux/of_device.h> 18 19 #include <mach/hardware.h> 20 21 #include "rtc-sa1100.h" 22 23 #define RTC_DEF_DIVIDER (32768 - 1) 24 #define RTC_DEF_TRIM 0 25 #define MAXFREQ_PERIODIC 1000 26 27 /* 28 * PXA Registers and bits definitions 29 */ 30 #define RTSR_PICE (1 << 15) /* Periodic interrupt count enable */ 31 #define RTSR_PIALE (1 << 14) /* Periodic interrupt Alarm enable */ 32 #define RTSR_PIAL (1 << 13) /* Periodic interrupt detected */ 33 #define RTSR_SWALE2 (1 << 11) /* RTC stopwatch alarm2 enable */ 34 #define RTSR_SWAL2 (1 << 10) /* RTC stopwatch alarm2 detected */ 35 #define RTSR_SWALE1 (1 << 9) /* RTC stopwatch alarm1 enable */ 36 #define RTSR_SWAL1 (1 << 8) /* RTC stopwatch alarm1 detected */ 37 #define RTSR_RDALE2 (1 << 7) /* RTC alarm2 enable */ 38 #define RTSR_RDAL2 (1 << 6) /* RTC alarm2 detected */ 39 #define RTSR_RDALE1 (1 << 5) /* RTC alarm1 enable */ 40 #define RTSR_RDAL1 (1 << 4) /* RTC alarm1 detected */ 41 #define RTSR_HZE (1 << 3) /* HZ interrupt enable */ 42 #define RTSR_ALE (1 << 2) /* RTC alarm interrupt enable */ 43 #define RTSR_HZ (1 << 1) /* HZ rising-edge detected */ 44 #define RTSR_AL (1 << 0) /* RTC alarm detected */ 45 #define RTSR_TRIG_MASK (RTSR_AL | RTSR_HZ | RTSR_RDAL1 | RTSR_RDAL2\ 46 | RTSR_SWAL1 | RTSR_SWAL2) 47 #define RYxR_YEAR_S 9 48 #define RYxR_YEAR_MASK (0xfff << RYxR_YEAR_S) 49 #define RYxR_MONTH_S 5 50 #define RYxR_MONTH_MASK (0xf << RYxR_MONTH_S) 51 #define RYxR_DAY_MASK 0x1f 52 #define RDxR_WOM_S 20 53 #define RDxR_WOM_MASK (0x7 << RDxR_WOM_S) 54 #define RDxR_DOW_S 17 55 #define RDxR_DOW_MASK (0x7 << RDxR_DOW_S) 56 #define RDxR_HOUR_S 12 57 #define RDxR_HOUR_MASK (0x1f << RDxR_HOUR_S) 58 #define RDxR_MIN_S 6 59 #define RDxR_MIN_MASK (0x3f << RDxR_MIN_S) 60 #define RDxR_SEC_MASK 0x3f 61 62 #define RTSR 0x08 63 #define RTTR 0x0c 64 #define RDCR 0x10 65 #define RYCR 0x14 66 #define RDAR1 0x18 67 #define RYAR1 0x1c 68 #define RTCPICR 0x34 69 #define PIAR 0x38 70 71 #define rtc_readl(pxa_rtc, reg) \ 72 __raw_readl((pxa_rtc)->base + (reg)) 73 #define rtc_writel(pxa_rtc, reg, value) \ 74 __raw_writel((value), (pxa_rtc)->base + (reg)) 75 76 struct pxa_rtc { 77 struct sa1100_rtc sa1100_rtc; 78 struct resource *ress; 79 void __iomem *base; 80 struct rtc_device *rtc; 81 spinlock_t lock; /* Protects this structure */ 82 }; 83 84 85 static u32 ryxr_calc(struct rtc_time *tm) 86 { 87 return ((tm->tm_year + 1900) << RYxR_YEAR_S) 88 | ((tm->tm_mon + 1) << RYxR_MONTH_S) 89 | tm->tm_mday; 90 } 91 92 static u32 rdxr_calc(struct rtc_time *tm) 93 { 94 return ((((tm->tm_mday + 6) / 7) << RDxR_WOM_S) & RDxR_WOM_MASK) 95 | (((tm->tm_wday + 1) << RDxR_DOW_S) & RDxR_DOW_MASK) 96 | (tm->tm_hour << RDxR_HOUR_S) 97 | (tm->tm_min << RDxR_MIN_S) 98 | tm->tm_sec; 99 } 100 101 static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm) 102 { 103 tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900; 104 tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1; 105 tm->tm_mday = (rycr & RYxR_DAY_MASK); 106 tm->tm_wday = ((rycr & RDxR_DOW_MASK) >> RDxR_DOW_S) - 1; 107 tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S; 108 tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S; 109 tm->tm_sec = rdcr & RDxR_SEC_MASK; 110 } 111 112 static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask) 113 { 114 u32 rtsr; 115 116 rtsr = rtc_readl(pxa_rtc, RTSR); 117 rtsr &= ~RTSR_TRIG_MASK; 118 rtsr &= ~mask; 119 rtc_writel(pxa_rtc, RTSR, rtsr); 120 } 121 122 static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask) 123 { 124 u32 rtsr; 125 126 rtsr = rtc_readl(pxa_rtc, RTSR); 127 rtsr &= ~RTSR_TRIG_MASK; 128 rtsr |= mask; 129 rtc_writel(pxa_rtc, RTSR, rtsr); 130 } 131 132 static irqreturn_t pxa_rtc_irq(int irq, void *dev_id) 133 { 134 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev_id); 135 u32 rtsr; 136 unsigned long events = 0; 137 138 spin_lock(&pxa_rtc->lock); 139 140 /* clear interrupt sources */ 141 rtsr = rtc_readl(pxa_rtc, RTSR); 142 rtc_writel(pxa_rtc, RTSR, rtsr); 143 144 /* temporary disable rtc interrupts */ 145 rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 | RTSR_PIALE | RTSR_HZE); 146 147 /* clear alarm interrupt if it has occurred */ 148 if (rtsr & RTSR_RDAL1) 149 rtsr &= ~RTSR_RDALE1; 150 151 /* update irq data & counter */ 152 if (rtsr & RTSR_RDAL1) 153 events |= RTC_AF | RTC_IRQF; 154 if (rtsr & RTSR_HZ) 155 events |= RTC_UF | RTC_IRQF; 156 if (rtsr & RTSR_PIAL) 157 events |= RTC_PF | RTC_IRQF; 158 159 rtc_update_irq(pxa_rtc->rtc, 1, events); 160 161 /* enable back rtc interrupts */ 162 rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK); 163 164 spin_unlock(&pxa_rtc->lock); 165 return IRQ_HANDLED; 166 } 167 168 static int pxa_rtc_open(struct device *dev) 169 { 170 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 171 int ret; 172 173 ret = request_irq(pxa_rtc->sa1100_rtc.irq_1hz, pxa_rtc_irq, 0, 174 "rtc 1Hz", dev); 175 if (ret < 0) { 176 dev_err(dev, "can't get irq %i, err %d\n", 177 pxa_rtc->sa1100_rtc.irq_1hz, ret); 178 goto err_irq_1Hz; 179 } 180 ret = request_irq(pxa_rtc->sa1100_rtc.irq_alarm, pxa_rtc_irq, 0, 181 "rtc Alrm", dev); 182 if (ret < 0) { 183 dev_err(dev, "can't get irq %i, err %d\n", 184 pxa_rtc->sa1100_rtc.irq_alarm, ret); 185 goto err_irq_Alrm; 186 } 187 188 return 0; 189 190 err_irq_Alrm: 191 free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev); 192 err_irq_1Hz: 193 return ret; 194 } 195 196 static void pxa_rtc_release(struct device *dev) 197 { 198 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 199 200 spin_lock_irq(&pxa_rtc->lock); 201 rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE); 202 spin_unlock_irq(&pxa_rtc->lock); 203 204 free_irq(pxa_rtc->sa1100_rtc.irq_1hz, dev); 205 free_irq(pxa_rtc->sa1100_rtc.irq_alarm, dev); 206 } 207 208 static int pxa_alarm_irq_enable(struct device *dev, unsigned int enabled) 209 { 210 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 211 212 spin_lock_irq(&pxa_rtc->lock); 213 214 if (enabled) 215 rtsr_set_bits(pxa_rtc, RTSR_RDALE1); 216 else 217 rtsr_clear_bits(pxa_rtc, RTSR_RDALE1); 218 219 spin_unlock_irq(&pxa_rtc->lock); 220 return 0; 221 } 222 223 static int pxa_rtc_read_time(struct device *dev, struct rtc_time *tm) 224 { 225 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 226 u32 rycr, rdcr; 227 228 rycr = rtc_readl(pxa_rtc, RYCR); 229 rdcr = rtc_readl(pxa_rtc, RDCR); 230 231 tm_calc(rycr, rdcr, tm); 232 return 0; 233 } 234 235 static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm) 236 { 237 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 238 239 rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm)); 240 rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm)); 241 242 return 0; 243 } 244 245 static int pxa_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 246 { 247 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 248 u32 rtsr, ryar, rdar; 249 250 ryar = rtc_readl(pxa_rtc, RYAR1); 251 rdar = rtc_readl(pxa_rtc, RDAR1); 252 tm_calc(ryar, rdar, &alrm->time); 253 254 rtsr = rtc_readl(pxa_rtc, RTSR); 255 alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0; 256 alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0; 257 return 0; 258 } 259 260 static int pxa_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 261 { 262 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 263 u32 rtsr; 264 265 spin_lock_irq(&pxa_rtc->lock); 266 267 rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time)); 268 rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time)); 269 270 rtsr = rtc_readl(pxa_rtc, RTSR); 271 if (alrm->enabled) 272 rtsr |= RTSR_RDALE1; 273 else 274 rtsr &= ~RTSR_RDALE1; 275 rtc_writel(pxa_rtc, RTSR, rtsr); 276 277 spin_unlock_irq(&pxa_rtc->lock); 278 279 return 0; 280 } 281 282 static int pxa_rtc_proc(struct device *dev, struct seq_file *seq) 283 { 284 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 285 286 seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR)); 287 seq_printf(seq, "update_IRQ\t: %s\n", 288 (rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no"); 289 seq_printf(seq, "periodic_IRQ\t: %s\n", 290 (rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no"); 291 seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR)); 292 293 return 0; 294 } 295 296 static const struct rtc_class_ops pxa_rtc_ops = { 297 .read_time = pxa_rtc_read_time, 298 .set_time = pxa_rtc_set_time, 299 .read_alarm = pxa_rtc_read_alarm, 300 .set_alarm = pxa_rtc_set_alarm, 301 .alarm_irq_enable = pxa_alarm_irq_enable, 302 .proc = pxa_rtc_proc, 303 }; 304 305 static int __init pxa_rtc_probe(struct platform_device *pdev) 306 { 307 struct device *dev = &pdev->dev; 308 struct pxa_rtc *pxa_rtc; 309 struct sa1100_rtc *sa1100_rtc; 310 int ret; 311 312 pxa_rtc = devm_kzalloc(dev, sizeof(*pxa_rtc), GFP_KERNEL); 313 if (!pxa_rtc) 314 return -ENOMEM; 315 sa1100_rtc = &pxa_rtc->sa1100_rtc; 316 317 spin_lock_init(&pxa_rtc->lock); 318 platform_set_drvdata(pdev, pxa_rtc); 319 320 pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0); 321 if (!pxa_rtc->ress) { 322 dev_err(dev, "No I/O memory resource defined\n"); 323 return -ENXIO; 324 } 325 326 sa1100_rtc->irq_1hz = platform_get_irq(pdev, 0); 327 if (sa1100_rtc->irq_1hz < 0) 328 return -ENXIO; 329 sa1100_rtc->irq_alarm = platform_get_irq(pdev, 1); 330 if (sa1100_rtc->irq_alarm < 0) 331 return -ENXIO; 332 333 pxa_rtc->base = devm_ioremap(dev, pxa_rtc->ress->start, 334 resource_size(pxa_rtc->ress)); 335 if (!pxa_rtc->base) { 336 dev_err(dev, "Unable to map pxa RTC I/O memory\n"); 337 return -ENOMEM; 338 } 339 340 pxa_rtc_open(dev); 341 342 sa1100_rtc->rcnr = pxa_rtc->base + 0x0; 343 sa1100_rtc->rtsr = pxa_rtc->base + 0x8; 344 sa1100_rtc->rtar = pxa_rtc->base + 0x4; 345 sa1100_rtc->rttr = pxa_rtc->base + 0xc; 346 ret = sa1100_rtc_init(pdev, sa1100_rtc); 347 if (ret) { 348 dev_err(dev, "Unable to init SA1100 RTC sub-device\n"); 349 return ret; 350 } 351 352 rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE); 353 354 pxa_rtc->rtc = devm_rtc_device_register(&pdev->dev, "pxa-rtc", 355 &pxa_rtc_ops, THIS_MODULE); 356 if (IS_ERR(pxa_rtc->rtc)) { 357 ret = PTR_ERR(pxa_rtc->rtc); 358 dev_err(dev, "Failed to register RTC device -> %d\n", ret); 359 return ret; 360 } 361 362 device_init_wakeup(dev, 1); 363 364 return 0; 365 } 366 367 static int __exit pxa_rtc_remove(struct platform_device *pdev) 368 { 369 struct device *dev = &pdev->dev; 370 371 pxa_rtc_release(dev); 372 return 0; 373 } 374 375 #ifdef CONFIG_OF 376 static const struct of_device_id pxa_rtc_dt_ids[] = { 377 { .compatible = "marvell,pxa-rtc" }, 378 {} 379 }; 380 MODULE_DEVICE_TABLE(of, pxa_rtc_dt_ids); 381 #endif 382 383 #ifdef CONFIG_PM_SLEEP 384 static int pxa_rtc_suspend(struct device *dev) 385 { 386 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 387 388 if (device_may_wakeup(dev)) 389 enable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm); 390 return 0; 391 } 392 393 static int pxa_rtc_resume(struct device *dev) 394 { 395 struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev); 396 397 if (device_may_wakeup(dev)) 398 disable_irq_wake(pxa_rtc->sa1100_rtc.irq_alarm); 399 return 0; 400 } 401 #endif 402 403 static SIMPLE_DEV_PM_OPS(pxa_rtc_pm_ops, pxa_rtc_suspend, pxa_rtc_resume); 404 405 static struct platform_driver pxa_rtc_driver = { 406 .remove = __exit_p(pxa_rtc_remove), 407 .driver = { 408 .name = "pxa-rtc", 409 .of_match_table = of_match_ptr(pxa_rtc_dt_ids), 410 .pm = &pxa_rtc_pm_ops, 411 }, 412 }; 413 414 module_platform_driver_probe(pxa_rtc_driver, pxa_rtc_probe); 415 416 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); 417 MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)"); 418 MODULE_LICENSE("GPL"); 419 MODULE_ALIAS("platform:pxa-rtc"); 420