David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1 | /* |
| 2 | * RTC class driver for "CMOS RTC": PCs, ACPI, etc |
| 3 | * |
| 4 | * Copyright (C) 1996 Paul Gortmaker (drivers/char/rtc.c) |
| 5 | * Copyright (C) 2006 David Brownell (convert to new framework) |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * The original "cmos clock" chip was an MC146818 chip, now obsolete. |
| 15 | * That defined the register interface now provided by all PCs, some |
| 16 | * non-PC systems, and incorporated into ACPI. Modern PC chipsets |
| 17 | * integrate an MC146818 clone in their southbridge, and boards use |
| 18 | * that instead of discrete clones like the DS12887 or M48T86. There |
| 19 | * are also clones that connect using the LPC bus. |
| 20 | * |
| 21 | * That register API is also used directly by various other drivers |
| 22 | * (notably for integrated NVRAM), infrastructure (x86 has code to |
| 23 | * bypass the RTC framework, directly reading the RTC during boot |
| 24 | * and updating minutes/seconds for systems using NTP synch) and |
| 25 | * utilities (like userspace 'hwclock', if no /dev node exists). |
| 26 | * |
| 27 | * So **ALL** calls to CMOS_READ and CMOS_WRITE must be done with |
| 28 | * interrupts disabled, holding the global rtc_lock, to exclude those |
| 29 | * other drivers and utilities on correctly configured systems. |
| 30 | */ |
Joe Perches | a737e83 | 2015-04-16 12:46:14 -0700 | [diff] [blame] | 31 | |
| 32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 33 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 34 | #include <linux/kernel.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <linux/spinlock.h> |
| 39 | #include <linux/platform_device.h> |
Jonathan Cameron | 5d2a503 | 2009-01-06 14:42:12 -0800 | [diff] [blame] | 40 | #include <linux/log2.h> |
Paul Fox | 2fb08e6 | 2011-01-12 17:00:07 -0800 | [diff] [blame] | 41 | #include <linux/pm.h> |
Sebastian Andrzej Siewior | 3bcbaf6 | 2011-02-22 21:07:46 +0100 | [diff] [blame] | 42 | #include <linux/of.h> |
| 43 | #include <linux/of_platform.h> |
Hans de Goede | f114850 | 2017-03-18 14:45:49 +0100 | [diff] [blame] | 44 | #ifdef CONFIG_X86 |
| 45 | #include <asm/i8259.h> |
| 46 | #endif |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 47 | |
| 48 | /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ |
Arnd Bergmann | 5ab788d | 2016-05-30 20:57:50 +0200 | [diff] [blame] | 49 | #include <linux/mc146818rtc.h> |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 50 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 51 | struct cmos_rtc { |
| 52 | struct rtc_device *rtc; |
| 53 | struct device *dev; |
| 54 | int irq; |
| 55 | struct resource *iomem; |
Adrian Huang | 88b8d33 | 2015-07-06 12:19:12 +0800 | [diff] [blame] | 56 | time64_t alarm_expires; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 57 | |
David Brownell | 87ac84f | 2007-05-08 00:34:00 -0700 | [diff] [blame] | 58 | void (*wake_on)(struct device *); |
| 59 | void (*wake_off)(struct device *); |
| 60 | |
| 61 | u8 enabled_wake; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 62 | u8 suspend_ctrl; |
| 63 | |
| 64 | /* newer hardware extends the original register set */ |
| 65 | u8 day_alrm; |
| 66 | u8 mon_alrm; |
| 67 | u8 century; |
Gabriele Mazzotta | 68669d5 | 2016-09-20 01:12:44 +0200 | [diff] [blame] | 68 | |
| 69 | struct rtc_wkalrm saved_wkalrm; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 70 | }; |
| 71 | |
| 72 | /* both platform and pnp busses use negative numbers for invalid irqs */ |
Anton Vorontsov | 2fac667 | 2009-01-06 14:42:11 -0800 | [diff] [blame] | 73 | #define is_valid_irq(n) ((n) > 0) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 74 | |
| 75 | static const char driver_name[] = "rtc_cmos"; |
| 76 | |
David Brownell | bcd9b89 | 2007-04-01 23:49:47 -0700 | [diff] [blame] | 77 | /* The RTC_INTR register may have e.g. RTC_PF set even if RTC_PIE is clear; |
| 78 | * always mask it against the irq enable bits in RTC_CONTROL. Bit values |
| 79 | * are the same: PF==PIE, AF=AIE, UF=UIE; so RTC_IRQMASK works with both. |
| 80 | */ |
| 81 | #define RTC_IRQMASK (RTC_PF | RTC_AF | RTC_UF) |
| 82 | |
| 83 | static inline int is_intr(u8 rtc_intr) |
| 84 | { |
| 85 | if (!(rtc_intr & RTC_IRQF)) |
| 86 | return 0; |
| 87 | return rtc_intr & RTC_IRQMASK; |
| 88 | } |
| 89 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 90 | /*----------------------------------------------------------------*/ |
| 91 | |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 92 | /* Much modern x86 hardware has HPETs (10+ MHz timers) which, because |
| 93 | * many BIOS programmers don't set up "sane mode" IRQ routing, are mostly |
| 94 | * used in a broken "legacy replacement" mode. The breakage includes |
| 95 | * HPET #1 hijacking the IRQ for this RTC, and being unavailable for |
| 96 | * other (better) use. |
| 97 | * |
| 98 | * When that broken mode is in use, platform glue provides a partial |
| 99 | * emulation of hardware RTC IRQ facilities using HPET #1. We don't |
| 100 | * want to use HPET for anything except those IRQs though... |
| 101 | */ |
| 102 | #ifdef CONFIG_HPET_EMULATE_RTC |
| 103 | #include <asm/hpet.h> |
| 104 | #else |
| 105 | |
| 106 | static inline int is_hpet_enabled(void) |
| 107 | { |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static inline int hpet_mask_rtc_irq_bit(unsigned long mask) |
| 112 | { |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static inline int hpet_set_rtc_irq_bit(unsigned long mask) |
| 117 | { |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static inline int |
| 122 | hpet_set_alarm_time(unsigned char hrs, unsigned char min, unsigned char sec) |
| 123 | { |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | static inline int hpet_set_periodic_freq(unsigned long freq) |
| 128 | { |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | static inline int hpet_rtc_dropped_irq(void) |
| 133 | { |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static inline int hpet_rtc_timer_init(void) |
| 138 | { |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | extern irq_handler_t hpet_rtc_interrupt; |
| 143 | |
| 144 | static inline int hpet_register_irq_handler(irq_handler_t handler) |
| 145 | { |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | static inline int hpet_unregister_irq_handler(irq_handler_t handler) |
| 150 | { |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | #endif |
| 155 | |
| 156 | /*----------------------------------------------------------------*/ |
| 157 | |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 158 | #ifdef RTC_PORT |
| 159 | |
| 160 | /* Most newer x86 systems have two register banks, the first used |
| 161 | * for RTC and NVRAM and the second only for NVRAM. Caller must |
| 162 | * own rtc_lock ... and we won't worry about access during NMI. |
| 163 | */ |
| 164 | #define can_bank2 true |
| 165 | |
| 166 | static inline unsigned char cmos_read_bank2(unsigned char addr) |
| 167 | { |
| 168 | outb(addr, RTC_PORT(2)); |
| 169 | return inb(RTC_PORT(3)); |
| 170 | } |
| 171 | |
| 172 | static inline void cmos_write_bank2(unsigned char val, unsigned char addr) |
| 173 | { |
| 174 | outb(addr, RTC_PORT(2)); |
Ondrej Zary | b43c1ea | 2012-01-10 15:10:26 -0800 | [diff] [blame] | 175 | outb(val, RTC_PORT(3)); |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | #else |
| 179 | |
| 180 | #define can_bank2 false |
| 181 | |
| 182 | static inline unsigned char cmos_read_bank2(unsigned char addr) |
| 183 | { |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static inline void cmos_write_bank2(unsigned char val, unsigned char addr) |
| 188 | { |
| 189 | } |
| 190 | |
| 191 | #endif |
| 192 | |
| 193 | /*----------------------------------------------------------------*/ |
| 194 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 195 | static int cmos_read_time(struct device *dev, struct rtc_time *t) |
| 196 | { |
| 197 | /* REVISIT: if the clock has a "century" register, use |
Arnd Bergmann | 5ab788d | 2016-05-30 20:57:50 +0200 | [diff] [blame] | 198 | * that instead of the heuristic in mc146818_get_time(). |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 199 | * That'll make Y3K compatility (year > 2070) easy! |
| 200 | */ |
Arnd Bergmann | 5ab788d | 2016-05-30 20:57:50 +0200 | [diff] [blame] | 201 | mc146818_get_time(t); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static int cmos_set_time(struct device *dev, struct rtc_time *t) |
| 206 | { |
| 207 | /* REVISIT: set the "century" register if available |
| 208 | * |
| 209 | * NOTE: this ignores the issue whereby updating the seconds |
| 210 | * takes effect exactly 500ms after we write the register. |
| 211 | * (Also queueing and other delays before we get this far.) |
| 212 | */ |
Arnd Bergmann | 5ab788d | 2016-05-30 20:57:50 +0200 | [diff] [blame] | 213 | return mc146818_set_time(t); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 214 | } |
| 215 | |
| 216 | static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 217 | { |
| 218 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 219 | unsigned char rtc_control; |
| 220 | |
| 221 | if (!is_valid_irq(cmos->irq)) |
| 222 | return -EIO; |
| 223 | |
| 224 | /* Basic alarms only support hour, minute, and seconds fields. |
| 225 | * Some also support day and month, for alarms up to a year in |
| 226 | * the future. |
| 227 | */ |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 228 | |
| 229 | spin_lock_irq(&rtc_lock); |
| 230 | t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM); |
| 231 | t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM); |
| 232 | t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM); |
| 233 | |
| 234 | if (cmos->day_alrm) { |
Mark Lord | 615bb29 | 2007-11-03 22:04:03 -0400 | [diff] [blame] | 235 | /* ignore upper bits on readback per ACPI spec */ |
| 236 | t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 237 | if (!t->time.tm_mday) |
| 238 | t->time.tm_mday = -1; |
| 239 | |
| 240 | if (cmos->mon_alrm) { |
| 241 | t->time.tm_mon = CMOS_READ(cmos->mon_alrm); |
| 242 | if (!t->time.tm_mon) |
| 243 | t->time.tm_mon = -1; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 248 | spin_unlock_irq(&rtc_lock); |
| 249 | |
Arnaud Patard | 3804a89 | 2010-04-29 11:58:44 +0200 | [diff] [blame] | 250 | if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
| 251 | if (((unsigned)t->time.tm_sec) < 0x60) |
| 252 | t->time.tm_sec = bcd2bin(t->time.tm_sec); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 253 | else |
Arnaud Patard | 3804a89 | 2010-04-29 11:58:44 +0200 | [diff] [blame] | 254 | t->time.tm_sec = -1; |
| 255 | if (((unsigned)t->time.tm_min) < 0x60) |
| 256 | t->time.tm_min = bcd2bin(t->time.tm_min); |
| 257 | else |
| 258 | t->time.tm_min = -1; |
| 259 | if (((unsigned)t->time.tm_hour) < 0x24) |
| 260 | t->time.tm_hour = bcd2bin(t->time.tm_hour); |
| 261 | else |
| 262 | t->time.tm_hour = -1; |
| 263 | |
| 264 | if (cmos->day_alrm) { |
| 265 | if (((unsigned)t->time.tm_mday) <= 0x31) |
| 266 | t->time.tm_mday = bcd2bin(t->time.tm_mday); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 267 | else |
Arnaud Patard | 3804a89 | 2010-04-29 11:58:44 +0200 | [diff] [blame] | 268 | t->time.tm_mday = -1; |
| 269 | |
| 270 | if (cmos->mon_alrm) { |
| 271 | if (((unsigned)t->time.tm_mon) <= 0x12) |
| 272 | t->time.tm_mon = bcd2bin(t->time.tm_mon)-1; |
| 273 | else |
| 274 | t->time.tm_mon = -1; |
| 275 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 276 | } |
| 277 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 278 | |
| 279 | t->enabled = !!(rtc_control & RTC_AIE); |
| 280 | t->pending = 0; |
| 281 | |
| 282 | return 0; |
| 283 | } |
| 284 | |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 285 | static void cmos_checkintr(struct cmos_rtc *cmos, unsigned char rtc_control) |
| 286 | { |
| 287 | unsigned char rtc_intr; |
| 288 | |
| 289 | /* NOTE after changing RTC_xIE bits we always read INTR_FLAGS; |
| 290 | * allegedly some older rtcs need that to handle irqs properly |
| 291 | */ |
| 292 | rtc_intr = CMOS_READ(RTC_INTR_FLAGS); |
| 293 | |
| 294 | if (is_hpet_enabled()) |
| 295 | return; |
| 296 | |
| 297 | rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; |
| 298 | if (is_intr(rtc_intr)) |
| 299 | rtc_update_irq(cmos->rtc, 1, rtc_intr); |
| 300 | } |
| 301 | |
| 302 | static void cmos_irq_enable(struct cmos_rtc *cmos, unsigned char mask) |
| 303 | { |
| 304 | unsigned char rtc_control; |
| 305 | |
| 306 | /* flush any pending IRQ status, notably for update irqs, |
| 307 | * before we enable new IRQs |
| 308 | */ |
| 309 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 310 | cmos_checkintr(cmos, rtc_control); |
| 311 | |
| 312 | rtc_control |= mask; |
| 313 | CMOS_WRITE(rtc_control, RTC_CONTROL); |
| 314 | hpet_set_rtc_irq_bit(mask); |
| 315 | |
| 316 | cmos_checkintr(cmos, rtc_control); |
| 317 | } |
| 318 | |
| 319 | static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask) |
| 320 | { |
| 321 | unsigned char rtc_control; |
| 322 | |
| 323 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 324 | rtc_control &= ~mask; |
| 325 | CMOS_WRITE(rtc_control, RTC_CONTROL); |
| 326 | hpet_mask_rtc_irq_bit(mask); |
| 327 | |
| 328 | cmos_checkintr(cmos, rtc_control); |
| 329 | } |
| 330 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 331 | static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 332 | { |
| 333 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
Sachin Kamat | 5e8599d | 2013-07-03 15:05:45 -0700 | [diff] [blame] | 334 | unsigned char mon, mday, hrs, min, sec, rtc_control; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 335 | |
| 336 | if (!is_valid_irq(cmos->irq)) |
| 337 | return -EIO; |
| 338 | |
Zhao Yakui | 2b653e0 | 2008-04-15 14:34:29 -0700 | [diff] [blame] | 339 | mon = t->time.tm_mon + 1; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 340 | mday = t->time.tm_mday; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 341 | hrs = t->time.tm_hour; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 342 | min = t->time.tm_min; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 343 | sec = t->time.tm_sec; |
Arnaud Patard | 3804a89 | 2010-04-29 11:58:44 +0200 | [diff] [blame] | 344 | |
| 345 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 346 | if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { |
| 347 | /* Writing 0xff means "don't care" or "match all". */ |
| 348 | mon = (mon <= 12) ? bin2bcd(mon) : 0xff; |
| 349 | mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff; |
| 350 | hrs = (hrs < 24) ? bin2bcd(hrs) : 0xff; |
| 351 | min = (min < 60) ? bin2bcd(min) : 0xff; |
| 352 | sec = (sec < 60) ? bin2bcd(sec) : 0xff; |
| 353 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 354 | |
| 355 | spin_lock_irq(&rtc_lock); |
| 356 | |
| 357 | /* next rtc irq must not be from previous alarm setting */ |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 358 | cmos_irq_disable(cmos, RTC_AIE); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 359 | |
| 360 | /* update alarm */ |
| 361 | CMOS_WRITE(hrs, RTC_HOURS_ALARM); |
| 362 | CMOS_WRITE(min, RTC_MINUTES_ALARM); |
| 363 | CMOS_WRITE(sec, RTC_SECONDS_ALARM); |
| 364 | |
| 365 | /* the system may support an "enhanced" alarm */ |
| 366 | if (cmos->day_alrm) { |
| 367 | CMOS_WRITE(mday, cmos->day_alrm); |
| 368 | if (cmos->mon_alrm) |
| 369 | CMOS_WRITE(mon, cmos->mon_alrm); |
| 370 | } |
| 371 | |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 372 | /* FIXME the HPET alarm glue currently ignores day_alrm |
| 373 | * and mon_alrm ... |
| 374 | */ |
| 375 | hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, t->time.tm_sec); |
| 376 | |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 377 | if (t->enabled) |
| 378 | cmos_irq_enable(cmos, RTC_AIE); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 379 | |
| 380 | spin_unlock_irq(&rtc_lock); |
| 381 | |
Adrian Huang | 88b8d33 | 2015-07-06 12:19:12 +0800 | [diff] [blame] | 382 | cmos->alarm_expires = rtc_tm_to_time64(&t->time); |
| 383 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 384 | return 0; |
| 385 | } |
| 386 | |
Herton Ronaldo Krzesinski | a8462ef | 2009-12-15 16:45:56 -0800 | [diff] [blame] | 387 | static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 388 | { |
| 389 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 390 | unsigned long flags; |
| 391 | |
Herton Ronaldo Krzesinski | a8462ef | 2009-12-15 16:45:56 -0800 | [diff] [blame] | 392 | if (!is_valid_irq(cmos->irq)) |
| 393 | return -EINVAL; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 394 | |
| 395 | spin_lock_irqsave(&rtc_lock, flags); |
Herton Ronaldo Krzesinski | a8462ef | 2009-12-15 16:45:56 -0800 | [diff] [blame] | 396 | |
| 397 | if (enabled) |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 398 | cmos_irq_enable(cmos, RTC_AIE); |
Herton Ronaldo Krzesinski | a8462ef | 2009-12-15 16:45:56 -0800 | [diff] [blame] | 399 | else |
| 400 | cmos_irq_disable(cmos, RTC_AIE); |
| 401 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 402 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 403 | return 0; |
| 404 | } |
| 405 | |
Javier Martinez Canillas | 6fca3fc | 2016-04-26 18:17:35 -0400 | [diff] [blame] | 406 | #if IS_ENABLED(CONFIG_RTC_INTF_PROC) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 407 | |
| 408 | static int cmos_procfs(struct device *dev, struct seq_file *seq) |
| 409 | { |
| 410 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 411 | unsigned char rtc_control, valid; |
| 412 | |
| 413 | spin_lock_irq(&rtc_lock); |
| 414 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 415 | valid = CMOS_READ(RTC_VALID); |
| 416 | spin_unlock_irq(&rtc_lock); |
| 417 | |
| 418 | /* NOTE: at least ICH6 reports battery status using a different |
| 419 | * (non-RTC) bit; and SQWE is ignored on many current systems. |
| 420 | */ |
Joe Perches | 4395eb1 | 2015-04-15 16:17:51 -0700 | [diff] [blame] | 421 | seq_printf(seq, |
| 422 | "periodic_IRQ\t: %s\n" |
| 423 | "update_IRQ\t: %s\n" |
| 424 | "HPET_emulated\t: %s\n" |
| 425 | // "square_wave\t: %s\n" |
| 426 | "BCD\t\t: %s\n" |
| 427 | "DST_enable\t: %s\n" |
| 428 | "periodic_freq\t: %d\n" |
| 429 | "batt_status\t: %s\n", |
| 430 | (rtc_control & RTC_PIE) ? "yes" : "no", |
| 431 | (rtc_control & RTC_UIE) ? "yes" : "no", |
| 432 | is_hpet_enabled() ? "yes" : "no", |
| 433 | // (rtc_control & RTC_SQWE) ? "yes" : "no", |
| 434 | (rtc_control & RTC_DM_BINARY) ? "no" : "yes", |
| 435 | (rtc_control & RTC_DST_EN) ? "yes" : "no", |
| 436 | cmos->rtc->irq_freq, |
| 437 | (valid & RTC_VRT) ? "okay" : "dead"); |
| 438 | |
| 439 | return 0; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 440 | } |
| 441 | |
| 442 | #else |
| 443 | #define cmos_procfs NULL |
| 444 | #endif |
| 445 | |
| 446 | static const struct rtc_class_ops cmos_rtc_ops = { |
Herton Ronaldo Krzesinski | a8462ef | 2009-12-15 16:45:56 -0800 | [diff] [blame] | 447 | .read_time = cmos_read_time, |
| 448 | .set_time = cmos_set_time, |
| 449 | .read_alarm = cmos_read_alarm, |
| 450 | .set_alarm = cmos_set_alarm, |
| 451 | .proc = cmos_procfs, |
Herton Ronaldo Krzesinski | a8462ef | 2009-12-15 16:45:56 -0800 | [diff] [blame] | 452 | .alarm_irq_enable = cmos_alarm_irq_enable, |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 453 | }; |
| 454 | |
| 455 | /*----------------------------------------------------------------*/ |
| 456 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 457 | /* |
| 458 | * All these chips have at least 64 bytes of address space, shared by |
| 459 | * RTC registers and NVRAM. Most of those bytes of NVRAM are used |
| 460 | * by boot firmware. Modern chips have 128 or 256 bytes. |
| 461 | */ |
| 462 | |
| 463 | #define NVRAM_OFFSET (RTC_REG_D + 1) |
| 464 | |
| 465 | static ssize_t |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 466 | cmos_nvram_read(struct file *filp, struct kobject *kobj, |
| 467 | struct bin_attribute *attr, |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 468 | char *buf, loff_t off, size_t count) |
| 469 | { |
| 470 | int retval; |
| 471 | |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 472 | off += NVRAM_OFFSET; |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 473 | spin_lock_irq(&rtc_lock); |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 474 | for (retval = 0; count; count--, off++, retval++) { |
| 475 | if (off < 128) |
| 476 | *buf++ = CMOS_READ(off); |
| 477 | else if (can_bank2) |
| 478 | *buf++ = cmos_read_bank2(off); |
| 479 | else |
| 480 | break; |
| 481 | } |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 482 | spin_unlock_irq(&rtc_lock); |
| 483 | |
| 484 | return retval; |
| 485 | } |
| 486 | |
| 487 | static ssize_t |
Chris Wright | 2c3c8be | 2010-05-12 18:28:57 -0700 | [diff] [blame] | 488 | cmos_nvram_write(struct file *filp, struct kobject *kobj, |
| 489 | struct bin_attribute *attr, |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 490 | char *buf, loff_t off, size_t count) |
| 491 | { |
| 492 | struct cmos_rtc *cmos; |
| 493 | int retval; |
| 494 | |
| 495 | cmos = dev_get_drvdata(container_of(kobj, struct device, kobj)); |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 496 | |
| 497 | /* NOTE: on at least PCs and Ataris, the boot firmware uses a |
| 498 | * checksum on part of the NVRAM data. That's currently ignored |
| 499 | * here. If userspace is smart enough to know what fields of |
| 500 | * NVRAM to update, updating checksums is also part of its job. |
| 501 | */ |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 502 | off += NVRAM_OFFSET; |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 503 | spin_lock_irq(&rtc_lock); |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 504 | for (retval = 0; count; count--, off++, retval++) { |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 505 | /* don't trash RTC registers */ |
| 506 | if (off == cmos->day_alrm |
| 507 | || off == cmos->mon_alrm |
| 508 | || off == cmos->century) |
| 509 | buf++; |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 510 | else if (off < 128) |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 511 | CMOS_WRITE(*buf++, off); |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 512 | else if (can_bank2) |
| 513 | cmos_write_bank2(*buf++, off); |
| 514 | else |
| 515 | break; |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 516 | } |
| 517 | spin_unlock_irq(&rtc_lock); |
| 518 | |
| 519 | return retval; |
| 520 | } |
| 521 | |
| 522 | static struct bin_attribute nvram = { |
| 523 | .attr = { |
| 524 | .name = "nvram", |
| 525 | .mode = S_IRUGO | S_IWUSR, |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 526 | }, |
| 527 | |
| 528 | .read = cmos_nvram_read, |
| 529 | .write = cmos_nvram_write, |
| 530 | /* size gets set up later */ |
| 531 | }; |
| 532 | |
| 533 | /*----------------------------------------------------------------*/ |
| 534 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 535 | static struct cmos_rtc cmos_rtc; |
| 536 | |
| 537 | static irqreturn_t cmos_interrupt(int irq, void *p) |
| 538 | { |
| 539 | u8 irqstat; |
David Brownell | 8a0bdfd | 2008-02-06 01:38:45 -0800 | [diff] [blame] | 540 | u8 rtc_control; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 541 | |
| 542 | spin_lock(&rtc_lock); |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 543 | |
| 544 | /* When the HPET interrupt handler calls us, the interrupt |
| 545 | * status is passed as arg1 instead of the irq number. But |
| 546 | * always clear irq status, even when HPET is in the way. |
| 547 | * |
| 548 | * Note that HPET and RTC are almost certainly out of phase, |
| 549 | * giving different IRQ status ... |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 550 | */ |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 551 | irqstat = CMOS_READ(RTC_INTR_FLAGS); |
| 552 | rtc_control = CMOS_READ(RTC_CONTROL); |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 553 | if (is_hpet_enabled()) |
| 554 | irqstat = (unsigned long)irq & 0xF0; |
Derek Basehore | 998a060 | 2013-07-03 15:07:54 -0700 | [diff] [blame] | 555 | |
| 556 | /* If we were suspended, RTC_CONTROL may not be accurate since the |
| 557 | * bios may have cleared it. |
| 558 | */ |
| 559 | if (!cmos_rtc.suspend_ctrl) |
| 560 | irqstat &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; |
| 561 | else |
| 562 | irqstat &= (cmos_rtc.suspend_ctrl & RTC_IRQMASK) | RTC_IRQF; |
David Brownell | 8a0bdfd | 2008-02-06 01:38:45 -0800 | [diff] [blame] | 563 | |
| 564 | /* All Linux RTC alarms should be treated as if they were oneshot. |
| 565 | * Similar code may be needed in system wakeup paths, in case the |
| 566 | * alarm woke the system. |
| 567 | */ |
| 568 | if (irqstat & RTC_AIE) { |
Derek Basehore | 998a060 | 2013-07-03 15:07:54 -0700 | [diff] [blame] | 569 | cmos_rtc.suspend_ctrl &= ~RTC_AIE; |
David Brownell | 8a0bdfd | 2008-02-06 01:38:45 -0800 | [diff] [blame] | 570 | rtc_control &= ~RTC_AIE; |
| 571 | CMOS_WRITE(rtc_control, RTC_CONTROL); |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 572 | hpet_mask_rtc_irq_bit(RTC_AIE); |
David Brownell | 8a0bdfd | 2008-02-06 01:38:45 -0800 | [diff] [blame] | 573 | CMOS_READ(RTC_INTR_FLAGS); |
| 574 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 575 | spin_unlock(&rtc_lock); |
| 576 | |
David Brownell | bcd9b89 | 2007-04-01 23:49:47 -0700 | [diff] [blame] | 577 | if (is_intr(irqstat)) { |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 578 | rtc_update_irq(p, 1, irqstat); |
| 579 | return IRQ_HANDLED; |
| 580 | } else |
| 581 | return IRQ_NONE; |
| 582 | } |
| 583 | |
Marko Vrh | 41ac8df | 2007-05-08 00:34:09 -0700 | [diff] [blame] | 584 | #ifdef CONFIG_PNP |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 585 | #define INITSECTION |
| 586 | |
| 587 | #else |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 588 | #define INITSECTION __init |
| 589 | #endif |
| 590 | |
| 591 | static int INITSECTION |
| 592 | cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq) |
| 593 | { |
Jingoo Han | 97a92e7 | 2013-11-12 15:10:38 -0800 | [diff] [blame] | 594 | struct cmos_rtc_board_info *info = dev_get_platdata(dev); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 595 | int retval = 0; |
| 596 | unsigned char rtc_control; |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 597 | unsigned address_space; |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 598 | u32 flags = 0; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 599 | |
| 600 | /* there can be only one ... */ |
| 601 | if (cmos_rtc.dev) |
| 602 | return -EBUSY; |
| 603 | |
| 604 | if (!ports) |
| 605 | return -ENODEV; |
| 606 | |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 607 | /* Claim I/O ports ASAP, minimizing conflict with legacy driver. |
| 608 | * |
| 609 | * REVISIT non-x86 systems may instead use memory space resources |
| 610 | * (needing ioremap etc), not i/o space resources like this ... |
| 611 | */ |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 612 | if (RTC_IOMAPPED) |
| 613 | ports = request_region(ports->start, resource_size(ports), |
| 614 | driver_name); |
| 615 | else |
| 616 | ports = request_mem_region(ports->start, resource_size(ports), |
| 617 | driver_name); |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 618 | if (!ports) { |
| 619 | dev_dbg(dev, "i/o registers already in use\n"); |
| 620 | return -EBUSY; |
| 621 | } |
| 622 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 623 | cmos_rtc.irq = rtc_irq; |
| 624 | cmos_rtc.iomem = ports; |
| 625 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 626 | /* Heuristic to deduce NVRAM size ... do what the legacy NVRAM |
| 627 | * driver did, but don't reject unknown configs. Old hardware |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 628 | * won't address 128 bytes. Newer chips have multiple banks, |
| 629 | * though they may not be listed in one I/O resource. |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 630 | */ |
| 631 | #if defined(CONFIG_ATARI) |
| 632 | address_space = 64; |
Wu Zhangjin | 95abd0d | 2009-11-05 09:21:54 +0800 | [diff] [blame] | 633 | #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) \ |
Srikanth Krishnakar | 8cb7c71 | 2010-10-14 04:03:35 +0000 | [diff] [blame] | 634 | || defined(__sparc__) || defined(__mips__) \ |
Arnd Bergmann | 5ee98ab | 2016-06-01 16:46:22 +0200 | [diff] [blame] | 635 | || defined(__powerpc__) || defined(CONFIG_MN10300) |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 636 | address_space = 128; |
| 637 | #else |
| 638 | #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes. |
| 639 | address_space = 128; |
| 640 | #endif |
David Brownell | c8fc40c | 2008-10-18 20:27:47 -0700 | [diff] [blame] | 641 | if (can_bank2 && ports->end > (ports->start + 1)) |
| 642 | address_space = 256; |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 643 | |
David Brownell | 87ac84f | 2007-05-08 00:34:00 -0700 | [diff] [blame] | 644 | /* For ACPI systems extension info comes from the FADT. On others, |
| 645 | * board specific setup provides it as appropriate. Systems where |
| 646 | * the alarm IRQ isn't automatically a wakeup IRQ (like ACPI, and |
| 647 | * some almost-clones) can provide hooks to make that behave. |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 648 | * |
| 649 | * Note that ACPI doesn't preclude putting these registers into |
| 650 | * "extended" areas of the chip, including some that we won't yet |
| 651 | * expect CMOS_READ and friends to handle. |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 652 | */ |
| 653 | if (info) { |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 654 | if (info->flags) |
| 655 | flags = info->flags; |
| 656 | if (info->address_space) |
| 657 | address_space = info->address_space; |
| 658 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 659 | if (info->rtc_day_alarm && info->rtc_day_alarm < 128) |
| 660 | cmos_rtc.day_alrm = info->rtc_day_alarm; |
| 661 | if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128) |
| 662 | cmos_rtc.mon_alrm = info->rtc_mon_alarm; |
| 663 | if (info->rtc_century && info->rtc_century < 128) |
| 664 | cmos_rtc.century = info->rtc_century; |
David Brownell | 87ac84f | 2007-05-08 00:34:00 -0700 | [diff] [blame] | 665 | |
| 666 | if (info->wake_on && info->wake_off) { |
| 667 | cmos_rtc.wake_on = info->wake_on; |
| 668 | cmos_rtc.wake_off = info->wake_off; |
| 669 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 670 | } |
| 671 | |
Dan Carpenter | 6ba8bcd | 2010-05-24 14:33:49 -0700 | [diff] [blame] | 672 | cmos_rtc.dev = dev; |
| 673 | dev_set_drvdata(dev, &cmos_rtc); |
| 674 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 675 | cmos_rtc.rtc = rtc_device_register(driver_name, dev, |
| 676 | &cmos_rtc_ops, THIS_MODULE); |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 677 | if (IS_ERR(cmos_rtc.rtc)) { |
| 678 | retval = PTR_ERR(cmos_rtc.rtc); |
| 679 | goto cleanup0; |
| 680 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 681 | |
Kay Sievers | d4afc76 | 2009-01-06 14:42:11 -0800 | [diff] [blame] | 682 | rename_region(ports, dev_name(&cmos_rtc.rtc->dev)); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 683 | |
| 684 | spin_lock_irq(&rtc_lock); |
| 685 | |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 686 | if (!(flags & CMOS_RTC_FLAGS_NOFREQ)) { |
| 687 | /* force periodic irq to CMOS reset default of 1024Hz; |
| 688 | * |
| 689 | * REVISIT it's been reported that at least one x86_64 ALI |
| 690 | * mobo doesn't use 32KHz here ... for portability we might |
| 691 | * need to do something about other clock frequencies. |
| 692 | */ |
| 693 | cmos_rtc.rtc->irq_freq = 1024; |
| 694 | hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq); |
| 695 | CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT); |
| 696 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 697 | |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 698 | /* disable irqs */ |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 699 | if (is_valid_irq(rtc_irq)) |
| 700 | cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE); |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 701 | |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 702 | rtc_control = CMOS_READ(RTC_CONTROL); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 703 | |
| 704 | spin_unlock_irq(&rtc_lock); |
| 705 | |
Arnaud Patard | 3804a89 | 2010-04-29 11:58:44 +0200 | [diff] [blame] | 706 | /* FIXME: |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 707 | * <asm-generic/rtc.h> doesn't know 12-hour mode either. |
| 708 | */ |
Sachin Kamat | 5e8599d | 2013-07-03 15:05:45 -0700 | [diff] [blame] | 709 | if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) { |
Arnaud Patard | 3804a89 | 2010-04-29 11:58:44 +0200 | [diff] [blame] | 710 | dev_warn(dev, "only 24-hr supported\n"); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 711 | retval = -ENXIO; |
| 712 | goto cleanup1; |
| 713 | } |
| 714 | |
Pratyush Anand | 970fc7f | 2016-09-15 09:38:16 +0530 | [diff] [blame] | 715 | hpet_rtc_timer_init(); |
| 716 | |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 717 | if (is_valid_irq(rtc_irq)) { |
| 718 | irq_handler_t rtc_cmos_int_handler; |
| 719 | |
| 720 | if (is_hpet_enabled()) { |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 721 | rtc_cmos_int_handler = hpet_rtc_interrupt; |
Andrew Morton | 24b3447 | 2014-01-23 15:55:15 -0800 | [diff] [blame] | 722 | retval = hpet_register_irq_handler(cmos_interrupt); |
| 723 | if (retval) { |
Pratyush Anand | 970fc7f | 2016-09-15 09:38:16 +0530 | [diff] [blame] | 724 | hpet_mask_rtc_irq_bit(RTC_IRQMASK); |
Jingoo Han | ee44335 | 2013-02-21 16:45:34 -0800 | [diff] [blame] | 725 | dev_warn(dev, "hpet_register_irq_handler " |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 726 | " failed in rtc_init()."); |
| 727 | goto cleanup1; |
| 728 | } |
| 729 | } else |
| 730 | rtc_cmos_int_handler = cmos_interrupt; |
| 731 | |
| 732 | retval = request_irq(rtc_irq, rtc_cmos_int_handler, |
Andy Shevchenko | 079062b | 2015-12-23 19:37:19 +0200 | [diff] [blame] | 733 | IRQF_SHARED, dev_name(&cmos_rtc.rtc->dev), |
David Brownell | ab6a2d7 | 2007-05-08 00:33:30 -0700 | [diff] [blame] | 734 | cmos_rtc.rtc); |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 735 | if (retval < 0) { |
| 736 | dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq); |
| 737 | goto cleanup1; |
| 738 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 739 | } |
| 740 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 741 | /* export at least the first block of NVRAM */ |
| 742 | nvram.size = address_space - NVRAM_OFFSET; |
| 743 | retval = sysfs_create_bin_file(&dev->kobj, &nvram); |
| 744 | if (retval < 0) { |
| 745 | dev_dbg(dev, "can't create nvram file? %d\n", retval); |
| 746 | goto cleanup2; |
| 747 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 748 | |
Jingoo Han | ee44335 | 2013-02-21 16:45:34 -0800 | [diff] [blame] | 749 | dev_info(dev, "%s%s, %zd bytes nvram%s\n", |
Krzysztof Halasa | 6d029b6 | 2009-04-21 12:24:49 -0700 | [diff] [blame] | 750 | !is_valid_irq(rtc_irq) ? "no alarms" : |
| 751 | cmos_rtc.mon_alrm ? "alarms up to one year" : |
| 752 | cmos_rtc.day_alrm ? "alarms up to one month" : |
| 753 | "alarms up to one day", |
| 754 | cmos_rtc.century ? ", y3k" : "", |
| 755 | nvram.size, |
| 756 | is_hpet_enabled() ? ", hpet irqs" : ""); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 757 | |
| 758 | return 0; |
| 759 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 760 | cleanup2: |
| 761 | if (is_valid_irq(rtc_irq)) |
| 762 | free_irq(rtc_irq, cmos_rtc.rtc); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 763 | cleanup1: |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 764 | cmos_rtc.dev = NULL; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 765 | rtc_device_unregister(cmos_rtc.rtc); |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 766 | cleanup0: |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 767 | if (RTC_IOMAPPED) |
| 768 | release_region(ports->start, resource_size(ports)); |
| 769 | else |
| 770 | release_mem_region(ports->start, resource_size(ports)); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 771 | return retval; |
| 772 | } |
| 773 | |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 774 | static void cmos_do_shutdown(int rtc_irq) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 775 | { |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 776 | spin_lock_irq(&rtc_lock); |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 777 | if (is_valid_irq(rtc_irq)) |
| 778 | cmos_irq_disable(&cmos_rtc, RTC_IRQMASK); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 779 | spin_unlock_irq(&rtc_lock); |
| 780 | } |
| 781 | |
LABBE Corentin | a3a0673 | 2016-10-18 16:39:54 +0200 | [diff] [blame] | 782 | static void cmos_do_remove(struct device *dev) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 783 | { |
| 784 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 785 | struct resource *ports; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 786 | |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 787 | cmos_do_shutdown(cmos->irq); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 788 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 789 | sysfs_remove_bin_file(&dev->kobj, &nvram); |
| 790 | |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 791 | if (is_valid_irq(cmos->irq)) { |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 792 | free_irq(cmos->irq, cmos->rtc); |
Bernhard Walle | 9d8af78 | 2008-02-06 01:38:52 -0800 | [diff] [blame] | 793 | hpet_unregister_irq_handler(cmos_interrupt); |
| 794 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 795 | |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 796 | rtc_device_unregister(cmos->rtc); |
| 797 | cmos->rtc = NULL; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 798 | |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 799 | ports = cmos->iomem; |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 800 | if (RTC_IOMAPPED) |
| 801 | release_region(ports->start, resource_size(ports)); |
| 802 | else |
| 803 | release_mem_region(ports->start, resource_size(ports)); |
David Brownell | 05440df | 2007-10-16 01:28:21 -0700 | [diff] [blame] | 804 | cmos->iomem = NULL; |
| 805 | |
| 806 | cmos->dev = NULL; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 807 | } |
| 808 | |
Adrian Huang | 88b8d33 | 2015-07-06 12:19:12 +0800 | [diff] [blame] | 809 | static int cmos_aie_poweroff(struct device *dev) |
| 810 | { |
| 811 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 812 | struct rtc_time now; |
| 813 | time64_t t_now; |
| 814 | int retval = 0; |
| 815 | unsigned char rtc_control; |
| 816 | |
| 817 | if (!cmos->alarm_expires) |
| 818 | return -EINVAL; |
| 819 | |
| 820 | spin_lock_irq(&rtc_lock); |
| 821 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 822 | spin_unlock_irq(&rtc_lock); |
| 823 | |
| 824 | /* We only care about the situation where AIE is disabled. */ |
| 825 | if (rtc_control & RTC_AIE) |
| 826 | return -EBUSY; |
| 827 | |
| 828 | cmos_read_time(dev, &now); |
| 829 | t_now = rtc_tm_to_time64(&now); |
| 830 | |
| 831 | /* |
| 832 | * When enabling "RTC wake-up" in BIOS setup, the machine reboots |
| 833 | * automatically right after shutdown on some buggy boxes. |
| 834 | * This automatic rebooting issue won't happen when the alarm |
| 835 | * time is larger than now+1 seconds. |
| 836 | * |
| 837 | * If the alarm time is equal to now+1 seconds, the issue can be |
| 838 | * prevented by cancelling the alarm. |
| 839 | */ |
| 840 | if (cmos->alarm_expires == t_now + 1) { |
| 841 | struct rtc_wkalrm alarm; |
| 842 | |
| 843 | /* Cancel the AIE timer by configuring the past time. */ |
| 844 | rtc_time64_to_tm(t_now - 1, &alarm.time); |
| 845 | alarm.enabled = 0; |
| 846 | retval = cmos_set_alarm(dev, &alarm); |
| 847 | } else if (cmos->alarm_expires > t_now + 1) { |
| 848 | retval = -EBUSY; |
| 849 | } |
| 850 | |
| 851 | return retval; |
| 852 | } |
| 853 | |
Paul Fox | 2fb08e6 | 2011-01-12 17:00:07 -0800 | [diff] [blame] | 854 | static int cmos_suspend(struct device *dev) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 855 | { |
| 856 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
David Brownell | bcd9b89 | 2007-04-01 23:49:47 -0700 | [diff] [blame] | 857 | unsigned char tmp; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 858 | |
| 859 | /* only the alarm might be a wakeup event source */ |
| 860 | spin_lock_irq(&rtc_lock); |
| 861 | cmos->suspend_ctrl = tmp = CMOS_READ(RTC_CONTROL); |
| 862 | if (tmp & (RTC_PIE|RTC_AIE|RTC_UIE)) { |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 863 | unsigned char mask; |
David Brownell | bcd9b89 | 2007-04-01 23:49:47 -0700 | [diff] [blame] | 864 | |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 865 | if (device_may_wakeup(dev)) |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 866 | mask = RTC_IRQMASK & ~RTC_AIE; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 867 | else |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 868 | mask = RTC_IRQMASK; |
| 869 | tmp &= ~mask; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 870 | CMOS_WRITE(tmp, RTC_CONTROL); |
Derek Basehore | e005715 | 2013-04-29 16:20:23 -0700 | [diff] [blame] | 871 | hpet_mask_rtc_irq_bit(mask); |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 872 | |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 873 | cmos_checkintr(cmos, tmp); |
David Brownell | bcd9b89 | 2007-04-01 23:49:47 -0700 | [diff] [blame] | 874 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 875 | spin_unlock_irq(&rtc_lock); |
| 876 | |
David Brownell | 87ac84f | 2007-05-08 00:34:00 -0700 | [diff] [blame] | 877 | if (tmp & RTC_AIE) { |
| 878 | cmos->enabled_wake = 1; |
| 879 | if (cmos->wake_on) |
| 880 | cmos->wake_on(dev); |
| 881 | else |
| 882 | enable_irq_wake(cmos->irq); |
| 883 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 884 | |
Gabriele Mazzotta | 68669d5 | 2016-09-20 01:12:44 +0200 | [diff] [blame] | 885 | cmos_read_alarm(dev, &cmos->saved_wkalrm); |
| 886 | |
Jingoo Han | ee44335 | 2013-02-21 16:45:34 -0800 | [diff] [blame] | 887 | dev_dbg(dev, "suspend%s, ctrl %02x\n", |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 888 | (tmp & RTC_AIE) ? ", alarm may wake" : "", |
| 889 | tmp); |
| 890 | |
| 891 | return 0; |
| 892 | } |
| 893 | |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 894 | /* We want RTC alarms to wake us from e.g. ACPI G2/S5 "soft off", even |
| 895 | * after a detour through G3 "mechanical off", although the ACPI spec |
| 896 | * says wakeup should only work from G1/S4 "hibernate". To most users, |
| 897 | * distinctions between S4 and S5 are pointless. So when the hardware |
| 898 | * allows, don't draw that distinction. |
| 899 | */ |
| 900 | static inline int cmos_poweroff(struct device *dev) |
| 901 | { |
Arnd Bergmann | 00f7f90 | 2016-09-22 11:48:00 +0200 | [diff] [blame] | 902 | if (!IS_ENABLED(CONFIG_PM)) |
| 903 | return -ENOSYS; |
| 904 | |
Paul Fox | 2fb08e6 | 2011-01-12 17:00:07 -0800 | [diff] [blame] | 905 | return cmos_suspend(dev); |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 906 | } |
| 907 | |
Gabriele Mazzotta | 68669d5 | 2016-09-20 01:12:44 +0200 | [diff] [blame] | 908 | static void cmos_check_wkalrm(struct device *dev) |
| 909 | { |
| 910 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 911 | struct rtc_wkalrm current_alarm; |
| 912 | time64_t t_current_expires; |
| 913 | time64_t t_saved_expires; |
| 914 | |
| 915 | cmos_read_alarm(dev, ¤t_alarm); |
| 916 | t_current_expires = rtc_tm_to_time64(¤t_alarm.time); |
| 917 | t_saved_expires = rtc_tm_to_time64(&cmos->saved_wkalrm.time); |
| 918 | if (t_current_expires != t_saved_expires || |
| 919 | cmos->saved_wkalrm.enabled != current_alarm.enabled) { |
| 920 | cmos_set_alarm(dev, &cmos->saved_wkalrm); |
| 921 | } |
| 922 | } |
| 923 | |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 924 | static void cmos_check_acpi_rtc_status(struct device *dev, |
| 925 | unsigned char *rtc_control); |
| 926 | |
Arnd Bergmann | 00f7f90 | 2016-09-22 11:48:00 +0200 | [diff] [blame] | 927 | static int __maybe_unused cmos_resume(struct device *dev) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 928 | { |
| 929 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
Derek Basehore | 998a060 | 2013-07-03 15:07:54 -0700 | [diff] [blame] | 930 | unsigned char tmp; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 931 | |
Derek Basehore | 998a060 | 2013-07-03 15:07:54 -0700 | [diff] [blame] | 932 | if (cmos->enabled_wake) { |
| 933 | if (cmos->wake_off) |
| 934 | cmos->wake_off(dev); |
| 935 | else |
| 936 | disable_irq_wake(cmos->irq); |
| 937 | cmos->enabled_wake = 0; |
| 938 | } |
| 939 | |
Gabriele Mazzotta | 68669d5 | 2016-09-20 01:12:44 +0200 | [diff] [blame] | 940 | /* The BIOS might have changed the alarm, restore it */ |
| 941 | cmos_check_wkalrm(dev); |
| 942 | |
Derek Basehore | 998a060 | 2013-07-03 15:07:54 -0700 | [diff] [blame] | 943 | spin_lock_irq(&rtc_lock); |
| 944 | tmp = cmos->suspend_ctrl; |
| 945 | cmos->suspend_ctrl = 0; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 946 | /* re-enable any irqs previously active */ |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 947 | if (tmp & RTC_IRQMASK) { |
| 948 | unsigned char mask; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 949 | |
Derek Basehore | ebf8d6c | 2013-06-12 14:04:45 -0700 | [diff] [blame] | 950 | if (device_may_wakeup(dev)) |
| 951 | hpet_rtc_timer_init(); |
| 952 | |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 953 | do { |
| 954 | CMOS_WRITE(tmp, RTC_CONTROL); |
| 955 | hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK); |
| 956 | |
| 957 | mask = CMOS_READ(RTC_INTR_FLAGS); |
| 958 | mask &= (tmp & RTC_IRQMASK) | RTC_IRQF; |
David Brownell | 7e2a31d | 2008-07-23 21:30:47 -0700 | [diff] [blame] | 959 | if (!is_hpet_enabled() || !is_intr(mask)) |
David Brownell | 35d3fdd | 2008-07-23 21:30:43 -0700 | [diff] [blame] | 960 | break; |
| 961 | |
| 962 | /* force one-shot behavior if HPET blocked |
| 963 | * the wake alarm's irq |
| 964 | */ |
| 965 | rtc_update_irq(cmos->rtc, 1, mask); |
| 966 | tmp &= ~RTC_AIE; |
| 967 | hpet_mask_rtc_irq_bit(RTC_AIE); |
| 968 | } while (mask & RTC_AIE); |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 969 | |
| 970 | if (tmp & RTC_AIE) |
| 971 | cmos_check_acpi_rtc_status(dev, &tmp); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 972 | } |
Derek Basehore | 998a060 | 2013-07-03 15:07:54 -0700 | [diff] [blame] | 973 | spin_unlock_irq(&rtc_lock); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 974 | |
Jingoo Han | ee44335 | 2013-02-21 16:45:34 -0800 | [diff] [blame] | 975 | dev_dbg(dev, "resume, ctrl %02x\n", tmp); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 976 | |
| 977 | return 0; |
| 978 | } |
| 979 | |
Mika Westerberg | b5ada46 | 2014-04-03 14:50:05 -0700 | [diff] [blame] | 980 | static SIMPLE_DEV_PM_OPS(cmos_pm_ops, cmos_suspend, cmos_resume); |
| 981 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 982 | /*----------------------------------------------------------------*/ |
| 983 | |
David Brownell | e07e232 | 2008-02-06 01:38:43 -0800 | [diff] [blame] | 984 | /* On non-x86 systems, a "CMOS" RTC lives most naturally on platform_bus. |
| 985 | * ACPI systems always list these as PNPACPI devices, and pre-ACPI PCs |
| 986 | * probably list them in similar PNPBIOS tables; so PNP is more common. |
| 987 | * |
| 988 | * We don't use legacy "poke at the hardware" probing. Ancient PCs that |
| 989 | * predate even PNPBIOS should set up platform_bus devices. |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 990 | */ |
| 991 | |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 992 | #ifdef CONFIG_ACPI |
| 993 | |
| 994 | #include <linux/acpi.h> |
| 995 | |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 996 | static u32 rtc_handler(void *context) |
| 997 | { |
Daniel Drake | b2201e5 | 2012-05-18 22:59:41 +0200 | [diff] [blame] | 998 | struct device *dev = context; |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 999 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 1000 | unsigned char rtc_control = 0; |
| 1001 | unsigned char rtc_intr; |
Ville Syrjälä | 368e21a | 2016-10-19 21:02:04 +0300 | [diff] [blame] | 1002 | unsigned long flags; |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 1003 | |
Ville Syrjälä | 368e21a | 2016-10-19 21:02:04 +0300 | [diff] [blame] | 1004 | spin_lock_irqsave(&rtc_lock, flags); |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 1005 | if (cmos_rtc.suspend_ctrl) |
| 1006 | rtc_control = CMOS_READ(RTC_CONTROL); |
| 1007 | if (rtc_control & RTC_AIE) { |
| 1008 | cmos_rtc.suspend_ctrl &= ~RTC_AIE; |
| 1009 | CMOS_WRITE(rtc_control, RTC_CONTROL); |
| 1010 | rtc_intr = CMOS_READ(RTC_INTR_FLAGS); |
| 1011 | rtc_update_irq(cmos->rtc, 1, rtc_intr); |
| 1012 | } |
Ville Syrjälä | 368e21a | 2016-10-19 21:02:04 +0300 | [diff] [blame] | 1013 | spin_unlock_irqrestore(&rtc_lock, flags); |
Daniel Drake | b2201e5 | 2012-05-18 22:59:41 +0200 | [diff] [blame] | 1014 | |
| 1015 | pm_wakeup_event(dev, 0); |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1016 | acpi_clear_event(ACPI_EVENT_RTC); |
| 1017 | acpi_disable_event(ACPI_EVENT_RTC, 0); |
| 1018 | return ACPI_INTERRUPT_HANDLED; |
| 1019 | } |
| 1020 | |
Daniel Drake | b2201e5 | 2012-05-18 22:59:41 +0200 | [diff] [blame] | 1021 | static inline void rtc_wake_setup(struct device *dev) |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1022 | { |
Daniel Drake | b2201e5 | 2012-05-18 22:59:41 +0200 | [diff] [blame] | 1023 | acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev); |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1024 | /* |
| 1025 | * After the RTC handler is installed, the Fixed_RTC event should |
| 1026 | * be disabled. Only when the RTC alarm is set will it be enabled. |
| 1027 | */ |
| 1028 | acpi_clear_event(ACPI_EVENT_RTC); |
| 1029 | acpi_disable_event(ACPI_EVENT_RTC, 0); |
| 1030 | } |
| 1031 | |
| 1032 | static void rtc_wake_on(struct device *dev) |
| 1033 | { |
| 1034 | acpi_clear_event(ACPI_EVENT_RTC); |
| 1035 | acpi_enable_event(ACPI_EVENT_RTC, 0); |
| 1036 | } |
| 1037 | |
| 1038 | static void rtc_wake_off(struct device *dev) |
| 1039 | { |
| 1040 | acpi_disable_event(ACPI_EVENT_RTC, 0); |
| 1041 | } |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1042 | |
| 1043 | /* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find |
| 1044 | * its device node and pass extra config data. This helps its driver use |
| 1045 | * capabilities that the now-obsolete mc146818 didn't have, and informs it |
| 1046 | * that this board's RTC is wakeup-capable (per ACPI spec). |
| 1047 | */ |
| 1048 | static struct cmos_rtc_board_info acpi_rtc_info; |
| 1049 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 1050 | static void cmos_wake_setup(struct device *dev) |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1051 | { |
| 1052 | if (acpi_disabled) |
| 1053 | return; |
| 1054 | |
Daniel Drake | b2201e5 | 2012-05-18 22:59:41 +0200 | [diff] [blame] | 1055 | rtc_wake_setup(dev); |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1056 | acpi_rtc_info.wake_on = rtc_wake_on; |
| 1057 | acpi_rtc_info.wake_off = rtc_wake_off; |
| 1058 | |
| 1059 | /* workaround bug in some ACPI tables */ |
| 1060 | if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) { |
| 1061 | dev_dbg(dev, "bogus FADT month_alarm (%d)\n", |
| 1062 | acpi_gbl_FADT.month_alarm); |
| 1063 | acpi_gbl_FADT.month_alarm = 0; |
| 1064 | } |
| 1065 | |
| 1066 | acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm; |
| 1067 | acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm; |
| 1068 | acpi_rtc_info.rtc_century = acpi_gbl_FADT.century; |
| 1069 | |
| 1070 | /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */ |
| 1071 | if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE) |
| 1072 | dev_info(dev, "RTC can wake from S4\n"); |
| 1073 | |
| 1074 | dev->platform_data = &acpi_rtc_info; |
| 1075 | |
| 1076 | /* RTC always wakes from S1/S2/S3, and often S4/STD */ |
| 1077 | device_init_wakeup(dev, 1); |
| 1078 | } |
| 1079 | |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 1080 | static void cmos_check_acpi_rtc_status(struct device *dev, |
| 1081 | unsigned char *rtc_control) |
| 1082 | { |
| 1083 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 1084 | acpi_event_status rtc_status; |
| 1085 | acpi_status status; |
| 1086 | |
| 1087 | if (acpi_gbl_FADT.flags & ACPI_FADT_FIXED_RTC) |
| 1088 | return; |
| 1089 | |
| 1090 | status = acpi_get_event_status(ACPI_EVENT_RTC, &rtc_status); |
| 1091 | if (ACPI_FAILURE(status)) { |
| 1092 | dev_err(dev, "Could not get RTC status\n"); |
| 1093 | } else if (rtc_status & ACPI_EVENT_FLAG_SET) { |
| 1094 | unsigned char mask; |
| 1095 | *rtc_control &= ~RTC_AIE; |
| 1096 | CMOS_WRITE(*rtc_control, RTC_CONTROL); |
| 1097 | mask = CMOS_READ(RTC_INTR_FLAGS); |
| 1098 | rtc_update_irq(cmos->rtc, 1, mask); |
| 1099 | } |
| 1100 | } |
| 1101 | |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1102 | #else |
| 1103 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 1104 | static void cmos_wake_setup(struct device *dev) |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1105 | { |
| 1106 | } |
| 1107 | |
Gabriele Mazzotta | 983bf12 | 2016-09-20 01:12:43 +0200 | [diff] [blame] | 1108 | static void cmos_check_acpi_rtc_status(struct device *dev, |
| 1109 | unsigned char *rtc_control) |
| 1110 | { |
| 1111 | } |
| 1112 | |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1113 | #endif |
| 1114 | |
Marko Vrh | 41ac8df | 2007-05-08 00:34:09 -0700 | [diff] [blame] | 1115 | #ifdef CONFIG_PNP |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1116 | |
| 1117 | #include <linux/pnp.h> |
| 1118 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 1119 | static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1120 | { |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1121 | cmos_wake_setup(&pnp->dev); |
| 1122 | |
Hans de Goede | f114850 | 2017-03-18 14:45:49 +0100 | [diff] [blame] | 1123 | if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0)) { |
| 1124 | unsigned int irq = 0; |
| 1125 | #ifdef CONFIG_X86 |
Matthew Garrett | 6cd8fa8 | 2007-06-01 00:46:51 -0700 | [diff] [blame] | 1126 | /* Some machines contain a PNP entry for the RTC, but |
| 1127 | * don't define the IRQ. It should always be safe to |
Hans de Goede | f114850 | 2017-03-18 14:45:49 +0100 | [diff] [blame] | 1128 | * hardcode it on systems with a legacy PIC. |
Matthew Garrett | 6cd8fa8 | 2007-06-01 00:46:51 -0700 | [diff] [blame] | 1129 | */ |
Hans de Goede | f114850 | 2017-03-18 14:45:49 +0100 | [diff] [blame] | 1130 | if (nr_legacy_irqs()) |
| 1131 | irq = 8; |
| 1132 | #endif |
Bjorn Helgaas | 8766ad0 | 2008-04-28 16:34:27 -0600 | [diff] [blame] | 1133 | return cmos_do_probe(&pnp->dev, |
Hans de Goede | f114850 | 2017-03-18 14:45:49 +0100 | [diff] [blame] | 1134 | pnp_get_resource(pnp, IORESOURCE_IO, 0), irq); |
| 1135 | } else { |
Matthew Garrett | 6cd8fa8 | 2007-06-01 00:46:51 -0700 | [diff] [blame] | 1136 | return cmos_do_probe(&pnp->dev, |
Bjorn Helgaas | 8766ad0 | 2008-04-28 16:34:27 -0600 | [diff] [blame] | 1137 | pnp_get_resource(pnp, IORESOURCE_IO, 0), |
| 1138 | pnp_irq(pnp, 0)); |
Hans de Goede | f114850 | 2017-03-18 14:45:49 +0100 | [diff] [blame] | 1139 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1140 | } |
| 1141 | |
LABBE Corentin | a3a0673 | 2016-10-18 16:39:54 +0200 | [diff] [blame] | 1142 | static void cmos_pnp_remove(struct pnp_dev *pnp) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1143 | { |
| 1144 | cmos_do_remove(&pnp->dev); |
| 1145 | } |
| 1146 | |
OGAWA Hirofumi | 004731b | 2010-01-08 14:43:11 -0800 | [diff] [blame] | 1147 | static void cmos_pnp_shutdown(struct pnp_dev *pnp) |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 1148 | { |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 1149 | struct device *dev = &pnp->dev; |
| 1150 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 1151 | |
Adrian Huang | 88b8d33 | 2015-07-06 12:19:12 +0800 | [diff] [blame] | 1152 | if (system_state == SYSTEM_POWER_OFF) { |
| 1153 | int retval = cmos_poweroff(dev); |
| 1154 | |
| 1155 | if (cmos_aie_poweroff(dev) < 0 && !retval) |
| 1156 | return; |
| 1157 | } |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 1158 | |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 1159 | cmos_do_shutdown(cmos->irq); |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 1160 | } |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1161 | |
| 1162 | static const struct pnp_device_id rtc_ids[] = { |
| 1163 | { .id = "PNP0b00", }, |
| 1164 | { .id = "PNP0b01", }, |
| 1165 | { .id = "PNP0b02", }, |
| 1166 | { }, |
| 1167 | }; |
| 1168 | MODULE_DEVICE_TABLE(pnp, rtc_ids); |
| 1169 | |
| 1170 | static struct pnp_driver cmos_pnp_driver = { |
| 1171 | .name = (char *) driver_name, |
| 1172 | .id_table = rtc_ids, |
| 1173 | .probe = cmos_pnp_probe, |
LABBE Corentin | a3a0673 | 2016-10-18 16:39:54 +0200 | [diff] [blame] | 1174 | .remove = cmos_pnp_remove, |
OGAWA Hirofumi | 004731b | 2010-01-08 14:43:11 -0800 | [diff] [blame] | 1175 | .shutdown = cmos_pnp_shutdown, |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1176 | |
| 1177 | /* flag ensures resume() gets called, and stops syslog spam */ |
| 1178 | .flags = PNP_DRIVER_RES_DO_NOT_CHANGE, |
Shuah Khan | a8a3808 | 2013-09-11 14:23:11 -0700 | [diff] [blame] | 1179 | .driver = { |
| 1180 | .pm = &cmos_pm_ops, |
| 1181 | }, |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1182 | }; |
| 1183 | |
Stas Sergeev | 1da2e3d | 2008-06-12 15:21:54 -0700 | [diff] [blame] | 1184 | #endif /* CONFIG_PNP */ |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1185 | |
Sebastian Andrzej Siewior | 3bcbaf6 | 2011-02-22 21:07:46 +0100 | [diff] [blame] | 1186 | #ifdef CONFIG_OF |
| 1187 | static const struct of_device_id of_cmos_match[] = { |
| 1188 | { |
| 1189 | .compatible = "motorola,mc146818", |
| 1190 | }, |
| 1191 | { }, |
| 1192 | }; |
| 1193 | MODULE_DEVICE_TABLE(of, of_cmos_match); |
| 1194 | |
| 1195 | static __init void cmos_of_init(struct platform_device *pdev) |
| 1196 | { |
| 1197 | struct device_node *node = pdev->dev.of_node; |
| 1198 | struct rtc_time time; |
| 1199 | int ret; |
| 1200 | const __be32 *val; |
| 1201 | |
| 1202 | if (!node) |
| 1203 | return; |
| 1204 | |
| 1205 | val = of_get_property(node, "ctrl-reg", NULL); |
| 1206 | if (val) |
| 1207 | CMOS_WRITE(be32_to_cpup(val), RTC_CONTROL); |
| 1208 | |
| 1209 | val = of_get_property(node, "freq-reg", NULL); |
| 1210 | if (val) |
| 1211 | CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT); |
| 1212 | |
Arnd Bergmann | 5ab788d | 2016-05-30 20:57:50 +0200 | [diff] [blame] | 1213 | cmos_read_time(&pdev->dev, &time); |
Sebastian Andrzej Siewior | 3bcbaf6 | 2011-02-22 21:07:46 +0100 | [diff] [blame] | 1214 | ret = rtc_valid_tm(&time); |
| 1215 | if (ret) { |
| 1216 | struct rtc_time def_time = { |
| 1217 | .tm_year = 1, |
| 1218 | .tm_mday = 1, |
| 1219 | }; |
Arnd Bergmann | 5ab788d | 2016-05-30 20:57:50 +0200 | [diff] [blame] | 1220 | cmos_set_time(&pdev->dev, &def_time); |
Sebastian Andrzej Siewior | 3bcbaf6 | 2011-02-22 21:07:46 +0100 | [diff] [blame] | 1221 | } |
| 1222 | } |
| 1223 | #else |
| 1224 | static inline void cmos_of_init(struct platform_device *pdev) {} |
Sebastian Andrzej Siewior | 3bcbaf6 | 2011-02-22 21:07:46 +0100 | [diff] [blame] | 1225 | #endif |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1226 | /*----------------------------------------------------------------*/ |
| 1227 | |
Marko Vrh | 41ac8df | 2007-05-08 00:34:09 -0700 | [diff] [blame] | 1228 | /* Platform setup should have set up an RTC device, when PNP is |
David Brownell | bcd9b89 | 2007-04-01 23:49:47 -0700 | [diff] [blame] | 1229 | * unavailable ... this could happen even on (older) PCs. |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1230 | */ |
| 1231 | |
| 1232 | static int __init cmos_platform_probe(struct platform_device *pdev) |
| 1233 | { |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 1234 | struct resource *resource; |
| 1235 | int irq; |
| 1236 | |
Sebastian Andrzej Siewior | 3bcbaf6 | 2011-02-22 21:07:46 +0100 | [diff] [blame] | 1237 | cmos_of_init(pdev); |
Bjorn Helgaas | a474aae | 2008-10-14 13:50:21 -0600 | [diff] [blame] | 1238 | cmos_wake_setup(&pdev->dev); |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 1239 | |
| 1240 | if (RTC_IOMAPPED) |
| 1241 | resource = platform_get_resource(pdev, IORESOURCE_IO, 0); |
| 1242 | else |
| 1243 | resource = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1244 | irq = platform_get_irq(pdev, 0); |
| 1245 | if (irq < 0) |
| 1246 | irq = -1; |
| 1247 | |
| 1248 | return cmos_do_probe(&pdev->dev, resource, irq); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1249 | } |
| 1250 | |
LABBE Corentin | a3a0673 | 2016-10-18 16:39:54 +0200 | [diff] [blame] | 1251 | static int cmos_platform_remove(struct platform_device *pdev) |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1252 | { |
| 1253 | cmos_do_remove(&pdev->dev); |
| 1254 | return 0; |
| 1255 | } |
| 1256 | |
| 1257 | static void cmos_platform_shutdown(struct platform_device *pdev) |
| 1258 | { |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 1259 | struct device *dev = &pdev->dev; |
| 1260 | struct cmos_rtc *cmos = dev_get_drvdata(dev); |
| 1261 | |
Adrian Huang | 88b8d33 | 2015-07-06 12:19:12 +0800 | [diff] [blame] | 1262 | if (system_state == SYSTEM_POWER_OFF) { |
| 1263 | int retval = cmos_poweroff(dev); |
| 1264 | |
| 1265 | if (cmos_aie_poweroff(dev) < 0 && !retval) |
| 1266 | return; |
| 1267 | } |
Rafael J. Wysocki | 74c4633 | 2008-09-02 14:36:11 -0700 | [diff] [blame] | 1268 | |
Maciej W. Rozycki | 31632db | 2014-06-06 14:35:49 -0700 | [diff] [blame] | 1269 | cmos_do_shutdown(cmos->irq); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1270 | } |
| 1271 | |
Kay Sievers | ad28a07 | 2008-04-10 21:29:25 -0700 | [diff] [blame] | 1272 | /* work with hotplug and coldplug */ |
| 1273 | MODULE_ALIAS("platform:rtc_cmos"); |
| 1274 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1275 | static struct platform_driver cmos_platform_driver = { |
LABBE Corentin | a3a0673 | 2016-10-18 16:39:54 +0200 | [diff] [blame] | 1276 | .remove = cmos_platform_remove, |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1277 | .shutdown = cmos_platform_shutdown, |
| 1278 | .driver = { |
Geert Uytterhoeven | c823a20 | 2014-01-23 15:55:11 -0800 | [diff] [blame] | 1279 | .name = driver_name, |
Paul Fox | 2fb08e6 | 2011-01-12 17:00:07 -0800 | [diff] [blame] | 1280 | .pm = &cmos_pm_ops, |
Sachin Kamat | c8a6046 | 2013-02-21 16:44:28 -0800 | [diff] [blame] | 1281 | .of_match_table = of_match_ptr(of_cmos_match), |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1282 | } |
| 1283 | }; |
| 1284 | |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1285 | #ifdef CONFIG_PNP |
| 1286 | static bool pnp_driver_registered; |
| 1287 | #endif |
| 1288 | static bool platform_driver_registered; |
| 1289 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1290 | static int __init cmos_init(void) |
| 1291 | { |
Bjorn Helgaas | 72f22b1 | 2008-10-14 17:01:59 -0600 | [diff] [blame] | 1292 | int retval = 0; |
| 1293 | |
Stas Sergeev | 1da2e3d | 2008-06-12 15:21:54 -0700 | [diff] [blame] | 1294 | #ifdef CONFIG_PNP |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1295 | retval = pnp_register_driver(&cmos_pnp_driver); |
| 1296 | if (retval == 0) |
| 1297 | pnp_driver_registered = true; |
Bjorn Helgaas | 72f22b1 | 2008-10-14 17:01:59 -0600 | [diff] [blame] | 1298 | #endif |
| 1299 | |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1300 | if (!cmos_rtc.dev) { |
Bjorn Helgaas | 72f22b1 | 2008-10-14 17:01:59 -0600 | [diff] [blame] | 1301 | retval = platform_driver_probe(&cmos_platform_driver, |
| 1302 | cmos_platform_probe); |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1303 | if (retval == 0) |
| 1304 | platform_driver_registered = true; |
| 1305 | } |
Bjorn Helgaas | 72f22b1 | 2008-10-14 17:01:59 -0600 | [diff] [blame] | 1306 | |
| 1307 | if (retval == 0) |
| 1308 | return 0; |
| 1309 | |
| 1310 | #ifdef CONFIG_PNP |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1311 | if (pnp_driver_registered) |
| 1312 | pnp_unregister_driver(&cmos_pnp_driver); |
Bjorn Helgaas | 72f22b1 | 2008-10-14 17:01:59 -0600 | [diff] [blame] | 1313 | #endif |
| 1314 | return retval; |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1315 | } |
| 1316 | module_init(cmos_init); |
| 1317 | |
| 1318 | static void __exit cmos_exit(void) |
| 1319 | { |
Stas Sergeev | 1da2e3d | 2008-06-12 15:21:54 -0700 | [diff] [blame] | 1320 | #ifdef CONFIG_PNP |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1321 | if (pnp_driver_registered) |
| 1322 | pnp_unregister_driver(&cmos_pnp_driver); |
Bjorn Helgaas | 72f22b1 | 2008-10-14 17:01:59 -0600 | [diff] [blame] | 1323 | #endif |
Thadeu Lima de Souza Cascardo | 6590981 | 2009-07-29 15:02:13 -0700 | [diff] [blame] | 1324 | if (platform_driver_registered) |
| 1325 | platform_driver_unregister(&cmos_platform_driver); |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1326 | } |
| 1327 | module_exit(cmos_exit); |
| 1328 | |
| 1329 | |
David Brownell | 7be2c7c | 2007-02-10 01:46:02 -0800 | [diff] [blame] | 1330 | MODULE_AUTHOR("David Brownell"); |
| 1331 | MODULE_DESCRIPTION("Driver for PC-style 'CMOS' RTCs"); |
| 1332 | MODULE_LICENSE("GPL"); |