Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 1 | /* |
| 2 | * rtc-mrst.c: Driver for Moorestown virtual RTC |
| 3 | * |
| 4 | * (C) Copyright 2009 Intel Corporation |
| 5 | * Author: Jacob Pan (jacob.jun.pan@intel.com) |
| 6 | * Feng Tang (feng.tang@intel.com) |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; version 2 |
| 11 | * of the License. |
| 12 | * |
| 13 | * Note: |
| 14 | * VRTC is emulated by system controller firmware, the real HW |
| 15 | * RTC is located in the PMIC device. SCU FW shadows PMIC RTC |
| 16 | * in a memory mapped IO space that is visible to the host IA |
| 17 | * processor. |
| 18 | * |
| 19 | * This driver is based upon drivers/rtc/rtc-cmos.c |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * Note: |
| 24 | * * vRTC only supports binary mode and 24H mode |
| 25 | * * vRTC only support PIE and AIE, no UIE, and its PIE only happens |
| 26 | * at 23:59:59pm everyday, no support for adjustable frequency |
| 27 | * * Alarm function is also limited to hr/min/sec. |
| 28 | */ |
| 29 | |
| 30 | #include <linux/mod_devicetable.h> |
| 31 | #include <linux/platform_device.h> |
| 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/spinlock.h> |
| 34 | #include <linux/kernel.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/sfi.h> |
| 38 | |
| 39 | #include <asm-generic/rtc.h> |
| 40 | #include <asm/intel_scu_ipc.h> |
Kuppuswamy Sathyanarayanan | 05454c2 | 2013-10-17 15:35:27 -0700 | [diff] [blame] | 41 | #include <asm/intel-mid.h> |
| 42 | #include <asm/intel_mid_vrtc.h> |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 43 | |
| 44 | struct mrst_rtc { |
| 45 | struct rtc_device *rtc; |
| 46 | struct device *dev; |
| 47 | int irq; |
| 48 | struct resource *iomem; |
| 49 | |
| 50 | u8 enabled_wake; |
| 51 | u8 suspend_ctrl; |
| 52 | }; |
| 53 | |
| 54 | static const char driver_name[] = "rtc_mrst"; |
| 55 | |
| 56 | #define RTC_IRQMASK (RTC_PF | RTC_AF) |
| 57 | |
| 58 | static inline int is_intr(u8 rtc_intr) |
| 59 | { |
| 60 | if (!(rtc_intr & RTC_IRQF)) |
| 61 | return 0; |
| 62 | return rtc_intr & RTC_IRQMASK; |
| 63 | } |
| 64 | |
Feng Tang | 168202c | 2011-02-15 00:13:32 +0800 | [diff] [blame] | 65 | static inline unsigned char vrtc_is_updating(void) |
| 66 | { |
| 67 | unsigned char uip; |
| 68 | unsigned long flags; |
| 69 | |
| 70 | spin_lock_irqsave(&rtc_lock, flags); |
| 71 | uip = (vrtc_cmos_read(RTC_FREQ_SELECT) & RTC_UIP); |
| 72 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 73 | return uip; |
| 74 | } |
| 75 | |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 76 | /* |
| 77 | * rtc_time's year contains the increment over 1900, but vRTC's YEAR |
| 78 | * register can't be programmed to value larger than 0x64, so vRTC |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 79 | * driver chose to use 1972 (1970 is UNIX time start point) as the base, |
Feng Tang | d3e1884 | 2010-11-17 12:11:24 +0000 | [diff] [blame] | 80 | * and does the translation at read/write time. |
| 81 | * |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 82 | * Why not just use 1970 as the offset? it's because using 1972 will |
Feng Tang | d3e1884 | 2010-11-17 12:11:24 +0000 | [diff] [blame] | 83 | * make it consistent in leap year setting for both vrtc and low-level |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 84 | * physical rtc devices. Then why not use 1960 as the offset? If we use |
| 85 | * 1960, for a device's first use, its YEAR register is 0 and the system |
| 86 | * year will be parsed as 1960 which is not a valid UNIX time and will |
| 87 | * cause many applications to fail mysteriously. |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 88 | */ |
| 89 | static int mrst_read_time(struct device *dev, struct rtc_time *time) |
| 90 | { |
| 91 | unsigned long flags; |
| 92 | |
Feng Tang | 168202c | 2011-02-15 00:13:32 +0800 | [diff] [blame] | 93 | if (vrtc_is_updating()) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 94 | mdelay(20); |
| 95 | |
| 96 | spin_lock_irqsave(&rtc_lock, flags); |
| 97 | time->tm_sec = vrtc_cmos_read(RTC_SECONDS); |
| 98 | time->tm_min = vrtc_cmos_read(RTC_MINUTES); |
| 99 | time->tm_hour = vrtc_cmos_read(RTC_HOURS); |
| 100 | time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH); |
| 101 | time->tm_mon = vrtc_cmos_read(RTC_MONTH); |
| 102 | time->tm_year = vrtc_cmos_read(RTC_YEAR); |
| 103 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 104 | |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 105 | /* Adjust for the 1972/1900 */ |
| 106 | time->tm_year += 72; |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 107 | time->tm_mon--; |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 108 | return rtc_valid_tm(time); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | static int mrst_set_time(struct device *dev, struct rtc_time *time) |
| 112 | { |
| 113 | int ret; |
| 114 | unsigned long flags; |
| 115 | unsigned char mon, day, hrs, min, sec; |
| 116 | unsigned int yrs; |
| 117 | |
| 118 | yrs = time->tm_year; |
| 119 | mon = time->tm_mon + 1; /* tm_mon starts at zero */ |
| 120 | day = time->tm_mday; |
| 121 | hrs = time->tm_hour; |
| 122 | min = time->tm_min; |
| 123 | sec = time->tm_sec; |
| 124 | |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 125 | if (yrs < 72 || yrs > 138) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 126 | return -EINVAL; |
Feng Tang | 57e6319 | 2011-11-10 13:23:39 +0000 | [diff] [blame] | 127 | yrs -= 72; |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 128 | |
| 129 | spin_lock_irqsave(&rtc_lock, flags); |
| 130 | |
| 131 | vrtc_cmos_write(yrs, RTC_YEAR); |
| 132 | vrtc_cmos_write(mon, RTC_MONTH); |
| 133 | vrtc_cmos_write(day, RTC_DAY_OF_MONTH); |
| 134 | vrtc_cmos_write(hrs, RTC_HOURS); |
| 135 | vrtc_cmos_write(min, RTC_MINUTES); |
| 136 | vrtc_cmos_write(sec, RTC_SECONDS); |
| 137 | |
| 138 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 139 | |
| 140 | ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETTIME); |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | static int mrst_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 145 | { |
| 146 | struct mrst_rtc *mrst = dev_get_drvdata(dev); |
| 147 | unsigned char rtc_control; |
| 148 | |
| 149 | if (mrst->irq <= 0) |
| 150 | return -EIO; |
| 151 | |
| 152 | /* Basic alarms only support hour, minute, and seconds fields. |
| 153 | * Some also support day and month, for alarms up to a year in |
| 154 | * the future. |
| 155 | */ |
| 156 | t->time.tm_mday = -1; |
| 157 | t->time.tm_mon = -1; |
| 158 | t->time.tm_year = -1; |
| 159 | |
| 160 | /* vRTC only supports binary mode */ |
| 161 | spin_lock_irq(&rtc_lock); |
| 162 | t->time.tm_sec = vrtc_cmos_read(RTC_SECONDS_ALARM); |
| 163 | t->time.tm_min = vrtc_cmos_read(RTC_MINUTES_ALARM); |
| 164 | t->time.tm_hour = vrtc_cmos_read(RTC_HOURS_ALARM); |
| 165 | |
| 166 | rtc_control = vrtc_cmos_read(RTC_CONTROL); |
| 167 | spin_unlock_irq(&rtc_lock); |
| 168 | |
| 169 | t->enabled = !!(rtc_control & RTC_AIE); |
| 170 | t->pending = 0; |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static void mrst_checkintr(struct mrst_rtc *mrst, unsigned char rtc_control) |
| 176 | { |
| 177 | unsigned char rtc_intr; |
| 178 | |
| 179 | /* |
| 180 | * NOTE after changing RTC_xIE bits we always read INTR_FLAGS; |
| 181 | * allegedly some older rtcs need that to handle irqs properly |
| 182 | */ |
| 183 | rtc_intr = vrtc_cmos_read(RTC_INTR_FLAGS); |
| 184 | rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF; |
| 185 | if (is_intr(rtc_intr)) |
| 186 | rtc_update_irq(mrst->rtc, 1, rtc_intr); |
| 187 | } |
| 188 | |
| 189 | static void mrst_irq_enable(struct mrst_rtc *mrst, unsigned char mask) |
| 190 | { |
| 191 | unsigned char rtc_control; |
| 192 | |
| 193 | /* |
| 194 | * Flush any pending IRQ status, notably for update irqs, |
| 195 | * before we enable new IRQs |
| 196 | */ |
| 197 | rtc_control = vrtc_cmos_read(RTC_CONTROL); |
| 198 | mrst_checkintr(mrst, rtc_control); |
| 199 | |
| 200 | rtc_control |= mask; |
| 201 | vrtc_cmos_write(rtc_control, RTC_CONTROL); |
| 202 | |
| 203 | mrst_checkintr(mrst, rtc_control); |
| 204 | } |
| 205 | |
| 206 | static void mrst_irq_disable(struct mrst_rtc *mrst, unsigned char mask) |
| 207 | { |
| 208 | unsigned char rtc_control; |
| 209 | |
| 210 | rtc_control = vrtc_cmos_read(RTC_CONTROL); |
| 211 | rtc_control &= ~mask; |
| 212 | vrtc_cmos_write(rtc_control, RTC_CONTROL); |
| 213 | mrst_checkintr(mrst, rtc_control); |
| 214 | } |
| 215 | |
| 216 | static int mrst_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
| 217 | { |
| 218 | struct mrst_rtc *mrst = dev_get_drvdata(dev); |
| 219 | unsigned char hrs, min, sec; |
| 220 | int ret = 0; |
| 221 | |
| 222 | if (!mrst->irq) |
| 223 | return -EIO; |
| 224 | |
| 225 | hrs = t->time.tm_hour; |
| 226 | min = t->time.tm_min; |
| 227 | sec = t->time.tm_sec; |
| 228 | |
| 229 | spin_lock_irq(&rtc_lock); |
| 230 | /* Next rtc irq must not be from previous alarm setting */ |
| 231 | mrst_irq_disable(mrst, RTC_AIE); |
| 232 | |
| 233 | /* Update alarm */ |
| 234 | vrtc_cmos_write(hrs, RTC_HOURS_ALARM); |
| 235 | vrtc_cmos_write(min, RTC_MINUTES_ALARM); |
| 236 | vrtc_cmos_write(sec, RTC_SECONDS_ALARM); |
| 237 | |
| 238 | spin_unlock_irq(&rtc_lock); |
| 239 | |
| 240 | ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETALARM); |
| 241 | if (ret) |
| 242 | return ret; |
| 243 | |
| 244 | spin_lock_irq(&rtc_lock); |
| 245 | if (t->enabled) |
| 246 | mrst_irq_enable(mrst, RTC_AIE); |
| 247 | |
| 248 | spin_unlock_irq(&rtc_lock); |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 253 | /* Currently, the vRTC doesn't support UIE ON/OFF */ |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 254 | static int mrst_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 255 | { |
| 256 | struct mrst_rtc *mrst = dev_get_drvdata(dev); |
| 257 | unsigned long flags; |
| 258 | |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 259 | spin_lock_irqsave(&rtc_lock, flags); |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 260 | if (enabled) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 261 | mrst_irq_enable(mrst, RTC_AIE); |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 262 | else |
| 263 | mrst_irq_disable(mrst, RTC_AIE); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 264 | spin_unlock_irqrestore(&rtc_lock, flags); |
| 265 | return 0; |
| 266 | } |
| 267 | |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 268 | |
Javier Martinez Canillas | 6fca3fc | 2016-04-26 18:17:35 -0400 | [diff] [blame^] | 269 | #if IS_ENABLED(CONFIG_RTC_INTF_PROC) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 270 | |
| 271 | static int mrst_procfs(struct device *dev, struct seq_file *seq) |
| 272 | { |
| 273 | unsigned char rtc_control, valid; |
| 274 | |
| 275 | spin_lock_irq(&rtc_lock); |
| 276 | rtc_control = vrtc_cmos_read(RTC_CONTROL); |
| 277 | valid = vrtc_cmos_read(RTC_VALID); |
| 278 | spin_unlock_irq(&rtc_lock); |
| 279 | |
Joe Perches | 4395eb1 | 2015-04-15 16:17:51 -0700 | [diff] [blame] | 280 | seq_printf(seq, |
| 281 | "periodic_IRQ\t: %s\n" |
| 282 | "alarm\t\t: %s\n" |
| 283 | "BCD\t\t: no\n" |
| 284 | "periodic_freq\t: daily (not adjustable)\n", |
| 285 | (rtc_control & RTC_PIE) ? "on" : "off", |
| 286 | (rtc_control & RTC_AIE) ? "on" : "off"); |
| 287 | |
| 288 | return 0; |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | #else |
| 292 | #define mrst_procfs NULL |
| 293 | #endif |
| 294 | |
| 295 | static const struct rtc_class_ops mrst_rtc_ops = { |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 296 | .read_time = mrst_read_time, |
| 297 | .set_time = mrst_set_time, |
| 298 | .read_alarm = mrst_read_alarm, |
| 299 | .set_alarm = mrst_set_alarm, |
| 300 | .proc = mrst_procfs, |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 301 | .alarm_irq_enable = mrst_rtc_alarm_irq_enable, |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 302 | }; |
| 303 | |
| 304 | static struct mrst_rtc mrst_rtc; |
| 305 | |
| 306 | /* |
| 307 | * When vRTC IRQ is captured by SCU FW, FW will clear the AIE bit in |
| 308 | * Reg B, so no need for this driver to clear it |
| 309 | */ |
| 310 | static irqreturn_t mrst_rtc_irq(int irq, void *p) |
| 311 | { |
| 312 | u8 irqstat; |
| 313 | |
| 314 | spin_lock(&rtc_lock); |
| 315 | /* This read will clear all IRQ flags inside Reg C */ |
| 316 | irqstat = vrtc_cmos_read(RTC_INTR_FLAGS); |
| 317 | spin_unlock(&rtc_lock); |
| 318 | |
| 319 | irqstat &= RTC_IRQMASK | RTC_IRQF; |
| 320 | if (is_intr(irqstat)) { |
| 321 | rtc_update_irq(p, 1, irqstat); |
| 322 | return IRQ_HANDLED; |
| 323 | } |
| 324 | return IRQ_NONE; |
| 325 | } |
| 326 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 327 | static int vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, |
| 328 | int rtc_irq) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 329 | { |
| 330 | int retval = 0; |
| 331 | unsigned char rtc_control; |
| 332 | |
| 333 | /* There can be only one ... */ |
| 334 | if (mrst_rtc.dev) |
| 335 | return -EBUSY; |
| 336 | |
| 337 | if (!iomem) |
| 338 | return -ENODEV; |
| 339 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 340 | iomem = request_mem_region(iomem->start, resource_size(iomem), |
| 341 | driver_name); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 342 | if (!iomem) { |
| 343 | dev_dbg(dev, "i/o mem already in use.\n"); |
| 344 | return -EBUSY; |
| 345 | } |
| 346 | |
| 347 | mrst_rtc.irq = rtc_irq; |
| 348 | mrst_rtc.iomem = iomem; |
Feng Tang | de97a21 | 2011-04-07 09:39:44 +0800 | [diff] [blame] | 349 | mrst_rtc.dev = dev; |
| 350 | dev_set_drvdata(dev, &mrst_rtc); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 351 | |
| 352 | mrst_rtc.rtc = rtc_device_register(driver_name, dev, |
| 353 | &mrst_rtc_ops, THIS_MODULE); |
| 354 | if (IS_ERR(mrst_rtc.rtc)) { |
| 355 | retval = PTR_ERR(mrst_rtc.rtc); |
| 356 | goto cleanup0; |
| 357 | } |
| 358 | |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 359 | rename_region(iomem, dev_name(&mrst_rtc.rtc->dev)); |
| 360 | |
| 361 | spin_lock_irq(&rtc_lock); |
| 362 | mrst_irq_disable(&mrst_rtc, RTC_PIE | RTC_AIE); |
| 363 | rtc_control = vrtc_cmos_read(RTC_CONTROL); |
| 364 | spin_unlock_irq(&rtc_lock); |
| 365 | |
| 366 | if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) |
| 367 | dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n"); |
| 368 | |
| 369 | if (rtc_irq) { |
| 370 | retval = request_irq(rtc_irq, mrst_rtc_irq, |
Yong Zhang | 2f6e5f9 | 2012-03-23 15:02:34 -0700 | [diff] [blame] | 371 | 0, dev_name(&mrst_rtc.rtc->dev), |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 372 | mrst_rtc.rtc); |
| 373 | if (retval < 0) { |
| 374 | dev_dbg(dev, "IRQ %d is already in use, err %d\n", |
| 375 | rtc_irq, retval); |
| 376 | goto cleanup1; |
| 377 | } |
| 378 | } |
| 379 | dev_dbg(dev, "initialised\n"); |
| 380 | return 0; |
| 381 | |
| 382 | cleanup1: |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 383 | rtc_device_unregister(mrst_rtc.rtc); |
| 384 | cleanup0: |
Feng Tang | de97a21 | 2011-04-07 09:39:44 +0800 | [diff] [blame] | 385 | mrst_rtc.dev = NULL; |
Julia Lawall | c258f9a | 2011-05-26 16:25:08 -0700 | [diff] [blame] | 386 | release_mem_region(iomem->start, resource_size(iomem)); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 387 | dev_err(dev, "rtc-mrst: unable to initialise\n"); |
| 388 | return retval; |
| 389 | } |
| 390 | |
| 391 | static void rtc_mrst_do_shutdown(void) |
| 392 | { |
| 393 | spin_lock_irq(&rtc_lock); |
| 394 | mrst_irq_disable(&mrst_rtc, RTC_IRQMASK); |
| 395 | spin_unlock_irq(&rtc_lock); |
| 396 | } |
| 397 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 398 | static void rtc_mrst_do_remove(struct device *dev) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 399 | { |
| 400 | struct mrst_rtc *mrst = dev_get_drvdata(dev); |
| 401 | struct resource *iomem; |
| 402 | |
| 403 | rtc_mrst_do_shutdown(); |
| 404 | |
| 405 | if (mrst->irq) |
| 406 | free_irq(mrst->irq, mrst->rtc); |
| 407 | |
| 408 | rtc_device_unregister(mrst->rtc); |
| 409 | mrst->rtc = NULL; |
| 410 | |
| 411 | iomem = mrst->iomem; |
Julia Lawall | c258f9a | 2011-05-26 16:25:08 -0700 | [diff] [blame] | 412 | release_mem_region(iomem->start, resource_size(iomem)); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 413 | mrst->iomem = NULL; |
| 414 | |
| 415 | mrst->dev = NULL; |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 416 | } |
| 417 | |
Lars-Peter Clausen | ddd2a30 | 2015-03-25 15:55:09 -0700 | [diff] [blame] | 418 | #ifdef CONFIG_PM_SLEEP |
| 419 | static int mrst_suspend(struct device *dev) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 420 | { |
| 421 | struct mrst_rtc *mrst = dev_get_drvdata(dev); |
| 422 | unsigned char tmp; |
| 423 | |
| 424 | /* Only the alarm might be a wakeup event source */ |
| 425 | spin_lock_irq(&rtc_lock); |
| 426 | mrst->suspend_ctrl = tmp = vrtc_cmos_read(RTC_CONTROL); |
| 427 | if (tmp & (RTC_PIE | RTC_AIE)) { |
| 428 | unsigned char mask; |
| 429 | |
| 430 | if (device_may_wakeup(dev)) |
| 431 | mask = RTC_IRQMASK & ~RTC_AIE; |
| 432 | else |
| 433 | mask = RTC_IRQMASK; |
| 434 | tmp &= ~mask; |
| 435 | vrtc_cmos_write(tmp, RTC_CONTROL); |
| 436 | |
| 437 | mrst_checkintr(mrst, tmp); |
| 438 | } |
| 439 | spin_unlock_irq(&rtc_lock); |
| 440 | |
| 441 | if (tmp & RTC_AIE) { |
| 442 | mrst->enabled_wake = 1; |
| 443 | enable_irq_wake(mrst->irq); |
| 444 | } |
| 445 | |
| 446 | dev_dbg(&mrst_rtc.rtc->dev, "suspend%s, ctrl %02x\n", |
| 447 | (tmp & RTC_AIE) ? ", alarm may wake" : "", |
| 448 | tmp); |
| 449 | |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * We want RTC alarms to wake us from the deep power saving state |
| 455 | */ |
| 456 | static inline int mrst_poweroff(struct device *dev) |
| 457 | { |
Lars-Peter Clausen | ddd2a30 | 2015-03-25 15:55:09 -0700 | [diff] [blame] | 458 | return mrst_suspend(dev); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 459 | } |
| 460 | |
| 461 | static int mrst_resume(struct device *dev) |
| 462 | { |
| 463 | struct mrst_rtc *mrst = dev_get_drvdata(dev); |
| 464 | unsigned char tmp = mrst->suspend_ctrl; |
| 465 | |
| 466 | /* Re-enable any irqs previously active */ |
| 467 | if (tmp & RTC_IRQMASK) { |
| 468 | unsigned char mask; |
| 469 | |
| 470 | if (mrst->enabled_wake) { |
| 471 | disable_irq_wake(mrst->irq); |
| 472 | mrst->enabled_wake = 0; |
| 473 | } |
| 474 | |
| 475 | spin_lock_irq(&rtc_lock); |
| 476 | do { |
| 477 | vrtc_cmos_write(tmp, RTC_CONTROL); |
| 478 | |
| 479 | mask = vrtc_cmos_read(RTC_INTR_FLAGS); |
| 480 | mask &= (tmp & RTC_IRQMASK) | RTC_IRQF; |
| 481 | if (!is_intr(mask)) |
| 482 | break; |
| 483 | |
| 484 | rtc_update_irq(mrst->rtc, 1, mask); |
| 485 | tmp &= ~RTC_AIE; |
| 486 | } while (mask & RTC_AIE); |
| 487 | spin_unlock_irq(&rtc_lock); |
| 488 | } |
| 489 | |
| 490 | dev_dbg(&mrst_rtc.rtc->dev, "resume, ctrl %02x\n", tmp); |
| 491 | |
| 492 | return 0; |
| 493 | } |
| 494 | |
Lars-Peter Clausen | ddd2a30 | 2015-03-25 15:55:09 -0700 | [diff] [blame] | 495 | static SIMPLE_DEV_PM_OPS(mrst_pm_ops, mrst_suspend, mrst_resume); |
| 496 | #define MRST_PM_OPS (&mrst_pm_ops) |
| 497 | |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 498 | #else |
Lars-Peter Clausen | ddd2a30 | 2015-03-25 15:55:09 -0700 | [diff] [blame] | 499 | #define MRST_PM_OPS NULL |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 500 | |
| 501 | static inline int mrst_poweroff(struct device *dev) |
| 502 | { |
| 503 | return -ENOSYS; |
| 504 | } |
| 505 | |
| 506 | #endif |
| 507 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 508 | static int vrtc_mrst_platform_probe(struct platform_device *pdev) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 509 | { |
| 510 | return vrtc_mrst_do_probe(&pdev->dev, |
| 511 | platform_get_resource(pdev, IORESOURCE_MEM, 0), |
| 512 | platform_get_irq(pdev, 0)); |
| 513 | } |
| 514 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 515 | static int vrtc_mrst_platform_remove(struct platform_device *pdev) |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 516 | { |
| 517 | rtc_mrst_do_remove(&pdev->dev); |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | static void vrtc_mrst_platform_shutdown(struct platform_device *pdev) |
| 522 | { |
| 523 | if (system_state == SYSTEM_POWER_OFF && !mrst_poweroff(&pdev->dev)) |
| 524 | return; |
| 525 | |
| 526 | rtc_mrst_do_shutdown(); |
| 527 | } |
| 528 | |
| 529 | MODULE_ALIAS("platform:vrtc_mrst"); |
| 530 | |
| 531 | static struct platform_driver vrtc_mrst_platform_driver = { |
| 532 | .probe = vrtc_mrst_platform_probe, |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 533 | .remove = vrtc_mrst_platform_remove, |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 534 | .shutdown = vrtc_mrst_platform_shutdown, |
| 535 | .driver = { |
Lars-Peter Clausen | ddd2a30 | 2015-03-25 15:55:09 -0700 | [diff] [blame] | 536 | .name = driver_name, |
| 537 | .pm = MRST_PM_OPS, |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 538 | } |
| 539 | }; |
| 540 | |
Axel Lin | 0c4eae6 | 2012-01-10 15:10:48 -0800 | [diff] [blame] | 541 | module_platform_driver(vrtc_mrst_platform_driver); |
Feng Tang | 0146f26 | 2010-11-10 17:29:17 +0000 | [diff] [blame] | 542 | |
| 543 | MODULE_AUTHOR("Jacob Pan; Feng Tang"); |
| 544 | MODULE_DESCRIPTION("Driver for Moorestown virtual RTC"); |
| 545 | MODULE_LICENSE("GPL"); |