1/* 2 * Copyright (c) 2008-2009 Nuvoton technology corporation. 3 * 4 * Wan ZongShun <mcuos.com@gmail.com> 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;version 2 of the License. 9 * 10 */ 11 12#include <linux/module.h> 13#include <linux/init.h> 14#include <linux/platform_device.h> 15#include <linux/slab.h> 16#include <linux/rtc.h> 17#include <linux/delay.h> 18#include <linux/io.h> 19#include <linux/bcd.h> 20 21/* RTC Control Registers */ 22#define REG_RTC_INIR 0x00 23#define REG_RTC_AER 0x04 24#define REG_RTC_FCR 0x08 25#define REG_RTC_TLR 0x0C 26#define REG_RTC_CLR 0x10 27#define REG_RTC_TSSR 0x14 28#define REG_RTC_DWR 0x18 29#define REG_RTC_TAR 0x1C 30#define REG_RTC_CAR 0x20 31#define REG_RTC_LIR 0x24 32#define REG_RTC_RIER 0x28 33#define REG_RTC_RIIR 0x2C 34#define REG_RTC_TTR 0x30 35 36#define RTCSET 0x01 37#define AERRWENB 0x10000 38#define INIRRESET 0xa5eb1357 39#define AERPOWERON 0xA965 40#define AERPOWEROFF 0x0000 41#define LEAPYEAR 0x0001 42#define TICKENB 0x80 43#define TICKINTENB 0x0002 44#define ALARMINTENB 0x0001 45#define MODE24 0x0001 46 47struct nuc900_rtc { 48 int irq_num; 49 void __iomem *rtc_reg; 50 struct rtc_device *rtcdev; 51}; 52 53struct nuc900_bcd_time { 54 int bcd_sec; 55 int bcd_min; 56 int bcd_hour; 57 int bcd_mday; 58 int bcd_mon; 59 int bcd_year; 60}; 61 62static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc) 63{ 64 struct nuc900_rtc *rtc = _rtc; 65 unsigned long events = 0, rtc_irq; 66 67 rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR); 68 69 if (rtc_irq & ALARMINTENB) { 70 rtc_irq &= ~ALARMINTENB; 71 __raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR); 72 events |= RTC_AF | RTC_IRQF; 73 } 74 75 if (rtc_irq & TICKINTENB) { 76 rtc_irq &= ~TICKINTENB; 77 __raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR); 78 events |= RTC_UF | RTC_IRQF; 79 } 80 81 rtc_update_irq(rtc->rtcdev, 1, events); 82 83 return IRQ_HANDLED; 84} 85 86static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc) 87{ 88 unsigned int timeout = 0x1000; 89 __raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR); 90 91 mdelay(10); 92 93 __raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER); 94 95 while (!(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) 96 && timeout--) 97 mdelay(1); 98 99 if (!timeout) 100 return ERR_PTR(-EPERM); 101 102 return 0; 103} 104 105static int nuc900_rtc_bcd2bin(unsigned int timereg, 106 unsigned int calreg, struct rtc_time *tm) 107{ 108 tm->tm_mday = bcd2bin(calreg >> 0); 109 tm->tm_mon = bcd2bin(calreg >> 8); 110 tm->tm_year = bcd2bin(calreg >> 16) + 100; 111 112 tm->tm_sec = bcd2bin(timereg >> 0); 113 tm->tm_min = bcd2bin(timereg >> 8); 114 tm->tm_hour = bcd2bin(timereg >> 16); 115 116 return rtc_valid_tm(tm); 117} 118 119static void nuc900_rtc_bin2bcd(struct device *dev, struct rtc_time *settm, 120 struct nuc900_bcd_time *gettm) 121{ 122 gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0; 123 gettm->bcd_mon = bin2bcd(settm->tm_mon) << 8; 124 125 if (settm->tm_year < 100) { 126 dev_warn(dev, "The year will be between 1970-1999, right?\n"); 127 gettm->bcd_year = bin2bcd(settm->tm_year) << 16; 128 } else { 129 gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16; 130 } 131 132 gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0; 133 gettm->bcd_min = bin2bcd(settm->tm_min) << 8; 134 gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16; 135} 136 137static int nuc900_update_irq_enable(struct device *dev, unsigned int enabled) 138{ 139 struct nuc900_rtc *rtc = dev_get_drvdata(dev); 140 141 if (enabled) 142 __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)| 143 (TICKINTENB), rtc->rtc_reg + REG_RTC_RIER); 144 else 145 __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)& 146 (~TICKINTENB), rtc->rtc_reg + REG_RTC_RIER); 147 148 return 0; 149} 150 151static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled) 152{ 153 struct nuc900_rtc *rtc = dev_get_drvdata(dev); 154 155 if (enabled) 156 __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)| 157 (ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER); 158 else 159 __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)& 160 (~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER); 161 162 return 0; 163} 164 165static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm) 166{ 167 struct nuc900_rtc *rtc = dev_get_drvdata(dev); 168 unsigned int timeval, clrval; 169 170 timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR); 171 clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR); 172 173 return nuc900_rtc_bcd2bin(timeval, clrval, tm); 174} 175 176static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm) 177{ 178 struct nuc900_rtc *rtc = dev_get_drvdata(dev); 179 struct nuc900_bcd_time gettm; 180 unsigned long val; 181 int *err; 182 183 nuc900_rtc_bin2bcd(dev, tm, &gettm); 184 185 err = check_rtc_access_enable(rtc); 186 if (IS_ERR(err)) 187 return PTR_ERR(err); 188 189 val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year; 190 __raw_writel(val, rtc->rtc_reg + REG_RTC_CLR); 191 192 val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour; 193 __raw_writel(val, rtc->rtc_reg + REG_RTC_TLR); 194 195 return 0; 196} 197 198static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 199{ 200 struct nuc900_rtc *rtc = dev_get_drvdata(dev); 201 unsigned int timeval, carval; 202 203 timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR); 204 carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR); 205 206 return nuc900_rtc_bcd2bin(timeval, carval, &alrm->time); 207} 208 209static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 210{ 211 struct nuc900_rtc *rtc = dev_get_drvdata(dev); 212 struct nuc900_bcd_time tm; 213 unsigned long val; 214 int *err; 215 216 nuc900_rtc_bin2bcd(dev, &alrm->time, &tm); 217 218 err = check_rtc_access_enable(rtc); 219 if (IS_ERR(err)) 220 return PTR_ERR(err); 221 222 val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year; 223 __raw_writel(val, rtc->rtc_reg + REG_RTC_CAR); 224 225 val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour; 226 __raw_writel(val, rtc->rtc_reg + REG_RTC_TAR); 227 228 return 0; 229} 230 231static struct rtc_class_ops nuc900_rtc_ops = { 232 .read_time = nuc900_rtc_read_time, 233 .set_time = nuc900_rtc_set_time, 234 .read_alarm = nuc900_rtc_read_alarm, 235 .set_alarm = nuc900_rtc_set_alarm, 236 .alarm_irq_enable = nuc900_alarm_irq_enable, 237 .update_irq_enable = nuc900_update_irq_enable, 238}; 239 240static int __devinit nuc900_rtc_probe(struct platform_device *pdev) 241{ 242 struct resource *res; 243 struct nuc900_rtc *nuc900_rtc; 244 int err = 0; 245 246 nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL); 247 if (!nuc900_rtc) { 248 dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n"); 249 return -ENOMEM; 250 } 251 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 252 if (!res) { 253 dev_err(&pdev->dev, "platform_get_resource failed\n"); 254 err = -ENXIO; 255 goto fail1; 256 } 257 258 if (!request_mem_region(res->start, resource_size(res), 259 pdev->name)) { 260 dev_err(&pdev->dev, "request_mem_region failed\n"); 261 err = -EBUSY; 262 goto fail1; 263 } 264 265 nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res)); 266 if (!nuc900_rtc->rtc_reg) { 267 dev_err(&pdev->dev, "ioremap rtc_reg failed\n"); 268 err = -ENOMEM; 269 goto fail2; 270 } 271 272 platform_set_drvdata(pdev, nuc900_rtc); 273 274 nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev, 275 &nuc900_rtc_ops, THIS_MODULE); 276 if (IS_ERR(nuc900_rtc->rtcdev)) { 277 dev_err(&pdev->dev, "rtc device register faild\n"); 278 err = PTR_ERR(nuc900_rtc->rtcdev); 279 goto fail3; 280 } 281 282 __raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24, 283 nuc900_rtc->rtc_reg + REG_RTC_TSSR); 284 285 nuc900_rtc->irq_num = platform_get_irq(pdev, 0); 286 if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt, 287 IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) { 288 dev_err(&pdev->dev, "NUC900 RTC request irq failed\n"); 289 err = -EBUSY; 290 goto fail4; 291 } 292 293 return 0; 294 295fail4: rtc_device_unregister(nuc900_rtc->rtcdev); 296fail3: iounmap(nuc900_rtc->rtc_reg); 297fail2: release_mem_region(res->start, resource_size(res)); 298fail1: kfree(nuc900_rtc); 299 return err; 300} 301 302static int __devexit nuc900_rtc_remove(struct platform_device *pdev) 303{ 304 struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev); 305 struct resource *res; 306 307 free_irq(nuc900_rtc->irq_num, nuc900_rtc); 308 rtc_device_unregister(nuc900_rtc->rtcdev); 309 iounmap(nuc900_rtc->rtc_reg); 310 311 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 312 release_mem_region(res->start, resource_size(res)); 313 314 kfree(nuc900_rtc); 315 316 platform_set_drvdata(pdev, NULL); 317 318 return 0; 319} 320 321static struct platform_driver nuc900_rtc_driver = { 322 .remove = __devexit_p(nuc900_rtc_remove), 323 .driver = { 324 .name = "nuc900-rtc", 325 .owner = THIS_MODULE, 326 }, 327}; 328 329static int __init nuc900_rtc_init(void) 330{ 331 return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe); 332} 333 334static void __exit nuc900_rtc_exit(void) 335{ 336 platform_driver_unregister(&nuc900_rtc_driver); 337} 338 339module_init(nuc900_rtc_init); 340module_exit(nuc900_rtc_exit); 341 342MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); 343MODULE_DESCRIPTION("nuc910/nuc920 RTC driver"); 344MODULE_LICENSE("GPL"); 345MODULE_ALIAS("platform:nuc900-rtc"); 346