Blame view
drivers/rtc/rtc-mv.c
9.23 KB
81f7e3824 Initial Release, ... |
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 |
/* * Driver for the RTC in Marvell SoCs. * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/bitops.h> #include <linux/io.h> #include <linux/platform_device.h> #include <linux/of.h> #include <linux/delay.h> #include <linux/clk.h> #include <linux/gfp.h> #include <linux/module.h> #define RTC_TIME_REG_OFFS 0 #define RTC_SECONDS_OFFS 0 #define RTC_MINUTES_OFFS 8 #define RTC_HOURS_OFFS 16 #define RTC_WDAY_OFFS 24 #define RTC_HOURS_12H_MODE BIT(22) /* 12 hour mode */ #define RTC_DATE_REG_OFFS 4 #define RTC_MDAY_OFFS 0 #define RTC_MONTH_OFFS 8 #define RTC_YEAR_OFFS 16 #define RTC_ALARM_TIME_REG_OFFS 8 #define RTC_ALARM_DATE_REG_OFFS 0xc #define RTC_ALARM_VALID BIT(7) #define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10 #define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14 struct rtc_plat_data { struct rtc_device *rtc; void __iomem *ioaddr; int irq; struct clk *clk; }; static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; u32 rtc_reg; rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) | (bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) | (bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) | (bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS); writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS); rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) | (bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) | (bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS); writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS); return 0; } static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; u32 rtc_time, rtc_date; unsigned int year, month, day, hour, minute, second, wday; rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS); rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS); second = rtc_time & 0x7f; minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f; hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */ wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7; day = rtc_date & 0x3f; month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f; year = (rtc_date >> RTC_YEAR_OFFS) & 0xff; tm->tm_sec = bcd2bin(second); tm->tm_min = bcd2bin(minute); tm->tm_hour = bcd2bin(hour); tm->tm_mday = bcd2bin(day); tm->tm_wday = bcd2bin(wday); tm->tm_mon = bcd2bin(month) - 1; /* hw counts from year 2000, but tm_year is relative to 1900 */ tm->tm_year = bcd2bin(year) + 100; return rtc_valid_tm(tm); } static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) { struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; u32 rtc_time, rtc_date; unsigned int year, month, day, hour, minute, second, wday; rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS); rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS); second = rtc_time & 0x7f; minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f; hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */ wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7; day = rtc_date & 0x3f; month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f; year = (rtc_date >> RTC_YEAR_OFFS) & 0xff; alm->time.tm_sec = bcd2bin(second); alm->time.tm_min = bcd2bin(minute); alm->time.tm_hour = bcd2bin(hour); alm->time.tm_mday = bcd2bin(day); alm->time.tm_wday = bcd2bin(wday); alm->time.tm_mon = bcd2bin(month) - 1; /* hw counts from year 2000, but tm_year is relative to 1900 */ alm->time.tm_year = bcd2bin(year) + 100; if (rtc_valid_tm(&alm->time) < 0) { dev_err(dev, "retrieved alarm date/time is not valid. "); rtc_time_to_tm(0, &alm->time); } alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); return 0; } static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) { struct rtc_plat_data *pdata = dev_get_drvdata(dev); void __iomem *ioaddr = pdata->ioaddr; u32 rtc_reg = 0; if (alm->time.tm_sec >= 0) rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec)) << RTC_SECONDS_OFFS; if (alm->time.tm_min >= 0) rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min)) << RTC_MINUTES_OFFS; if (alm->time.tm_hour >= 0) rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour)) << RTC_HOURS_OFFS; writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS); if (alm->time.tm_mday >= 0) rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday)) << RTC_MDAY_OFFS; else rtc_reg = 0; if (alm->time.tm_mon >= 0) rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1)) << RTC_MONTH_OFFS; if (alm->time.tm_year >= 0) rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100)) << RTC_YEAR_OFFS; writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS); writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS); writel(alm->enabled ? 1 : 0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); return 0; } static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct platform_device *pdev = to_platform_device(dev); struct rtc_plat_data *pdata = platform_get_drvdata(pdev); void __iomem *ioaddr = pdata->ioaddr; if (pdata->irq < 0) return -EINVAL; /* fall back into rtc-dev's emulation */ if (enabled) writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); else writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); return 0; } static irqreturn_t mv_rtc_interrupt(int irq, void *data) { struct rtc_plat_data *pdata = data; void __iomem *ioaddr = pdata->ioaddr; /* alarm irq? */ if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS)) return IRQ_NONE; /* clear interrupt */ writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS); rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF); return IRQ_HANDLED; } static const struct rtc_class_ops mv_rtc_ops = { .read_time = mv_rtc_read_time, .set_time = mv_rtc_set_time, }; static const struct rtc_class_ops mv_rtc_alarm_ops = { .read_time = mv_rtc_read_time, .set_time = mv_rtc_set_time, .read_alarm = mv_rtc_read_alarm, .set_alarm = mv_rtc_set_alarm, .alarm_irq_enable = mv_rtc_alarm_irq_enable, }; static int __init mv_rtc_probe(struct platform_device *pdev) { struct resource *res; struct rtc_plat_data *pdata; u32 rtc_time; u32 rtc_date; int ret = 0; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(pdata->ioaddr)) return PTR_ERR(pdata->ioaddr); pdata->clk = devm_clk_get(&pdev->dev, NULL); /* Not all SoCs require a clock.*/ if (!IS_ERR(pdata->clk)) clk_prepare_enable(pdata->clk); /* make sure the 24 hour mode is enabled */ rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS); if (rtc_time & RTC_HOURS_12H_MODE) { dev_err(&pdev->dev, "12 Hour mode is enabled but not supported. "); ret = -EINVAL; goto out; } /* make sure it is actually functional */ if (rtc_time == 0x01000000) { ssleep(1); rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS); if (rtc_time == 0x01000000) { dev_err(&pdev->dev, "internal RTC not ticking "); ret = -ENODEV; goto out; } } /* * A date after January 19th, 2038 does not fit on 32 bits and * will confuse the kernel and userspace. Reset to a sane date * (January 1st, 2013) if we're after 2038. */ rtc_date = readl(pdata->ioaddr + RTC_DATE_REG_OFFS); if (bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff) >= 38) { dev_info(&pdev->dev, "invalid RTC date, resetting to January 1st, 2013 "); writel(0x130101, pdata->ioaddr + RTC_DATE_REG_OFFS); } pdata->irq = platform_get_irq(pdev, 0); platform_set_drvdata(pdev, pdata); if (pdata->irq >= 0) { device_init_wakeup(&pdev->dev, 1); pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &mv_rtc_alarm_ops, THIS_MODULE); } else { pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &mv_rtc_ops, THIS_MODULE); } if (IS_ERR(pdata->rtc)) { ret = PTR_ERR(pdata->rtc); goto out; } if (pdata->irq >= 0) { writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS); if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt, IRQF_SHARED, pdev->name, pdata) < 0) { dev_warn(&pdev->dev, "interrupt not available. "); pdata->irq = -1; } } return 0; out: if (!IS_ERR(pdata->clk)) clk_disable_unprepare(pdata->clk); return ret; } static int __exit mv_rtc_remove(struct platform_device *pdev) { struct rtc_plat_data *pdata = platform_get_drvdata(pdev); if (pdata->irq >= 0) device_init_wakeup(&pdev->dev, 0); if (!IS_ERR(pdata->clk)) clk_disable_unprepare(pdata->clk); return 0; } #ifdef CONFIG_OF static const struct of_device_id rtc_mv_of_match_table[] = { { .compatible = "marvell,orion-rtc", }, {} }; MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table); #endif static struct platform_driver mv_rtc_driver = { .remove = __exit_p(mv_rtc_remove), .driver = { .name = "rtc-mv", .of_match_table = of_match_ptr(rtc_mv_of_match_table), }, }; module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe); MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>"); MODULE_DESCRIPTION("Marvell RTC driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:rtc-mv"); |