David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * TI OMAP1 Real Time Clock interface for Linux |
| 3 | * |
| 4 | * Copyright (C) 2003 MontaVista Software, Inc. |
| 5 | * Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com> |
| 6 | * |
| 7 | * Copyright (C) 2006 David Brownell (new RTC framework) |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; either version |
| 12 | * 2 of the License, or (at your option) any later version. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/ioport.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/rtc.h> |
| 21 | #include <linux/bcd.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | |
| 24 | #include <asm/io.h> |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 25 | |
| 26 | |
| 27 | /* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock |
| 28 | * with century-range alarm matching, driven by the 32kHz clock. |
| 29 | * |
| 30 | * The main user-visible ways it differs from PC RTCs are by omitting |
| 31 | * "don't care" alarm fields and sub-second periodic IRQs, and having |
| 32 | * an autoadjust mechanism to calibrate to the true oscillator rate. |
| 33 | * |
| 34 | * Board-specific wiring options include using split power mode with |
| 35 | * RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset), |
| 36 | * and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from |
| 37 | * low power modes). See the BOARD-SPECIFIC CUSTOMIZATION comment. |
| 38 | */ |
| 39 | |
| 40 | #define OMAP_RTC_BASE 0xfffb4800 |
| 41 | |
| 42 | /* RTC registers */ |
| 43 | #define OMAP_RTC_SECONDS_REG 0x00 |
| 44 | #define OMAP_RTC_MINUTES_REG 0x04 |
| 45 | #define OMAP_RTC_HOURS_REG 0x08 |
| 46 | #define OMAP_RTC_DAYS_REG 0x0C |
| 47 | #define OMAP_RTC_MONTHS_REG 0x10 |
| 48 | #define OMAP_RTC_YEARS_REG 0x14 |
| 49 | #define OMAP_RTC_WEEKS_REG 0x18 |
| 50 | |
| 51 | #define OMAP_RTC_ALARM_SECONDS_REG 0x20 |
| 52 | #define OMAP_RTC_ALARM_MINUTES_REG 0x24 |
| 53 | #define OMAP_RTC_ALARM_HOURS_REG 0x28 |
| 54 | #define OMAP_RTC_ALARM_DAYS_REG 0x2c |
| 55 | #define OMAP_RTC_ALARM_MONTHS_REG 0x30 |
| 56 | #define OMAP_RTC_ALARM_YEARS_REG 0x34 |
| 57 | |
| 58 | #define OMAP_RTC_CTRL_REG 0x40 |
| 59 | #define OMAP_RTC_STATUS_REG 0x44 |
| 60 | #define OMAP_RTC_INTERRUPTS_REG 0x48 |
| 61 | |
| 62 | #define OMAP_RTC_COMP_LSB_REG 0x4c |
| 63 | #define OMAP_RTC_COMP_MSB_REG 0x50 |
| 64 | #define OMAP_RTC_OSC_REG 0x54 |
| 65 | |
| 66 | /* OMAP_RTC_CTRL_REG bit fields: */ |
| 67 | #define OMAP_RTC_CTRL_SPLIT (1<<7) |
| 68 | #define OMAP_RTC_CTRL_DISABLE (1<<6) |
| 69 | #define OMAP_RTC_CTRL_SET_32_COUNTER (1<<5) |
| 70 | #define OMAP_RTC_CTRL_TEST (1<<4) |
| 71 | #define OMAP_RTC_CTRL_MODE_12_24 (1<<3) |
| 72 | #define OMAP_RTC_CTRL_AUTO_COMP (1<<2) |
| 73 | #define OMAP_RTC_CTRL_ROUND_30S (1<<1) |
| 74 | #define OMAP_RTC_CTRL_STOP (1<<0) |
| 75 | |
| 76 | /* OMAP_RTC_STATUS_REG bit fields: */ |
| 77 | #define OMAP_RTC_STATUS_POWER_UP (1<<7) |
| 78 | #define OMAP_RTC_STATUS_ALARM (1<<6) |
| 79 | #define OMAP_RTC_STATUS_1D_EVENT (1<<5) |
| 80 | #define OMAP_RTC_STATUS_1H_EVENT (1<<4) |
| 81 | #define OMAP_RTC_STATUS_1M_EVENT (1<<3) |
| 82 | #define OMAP_RTC_STATUS_1S_EVENT (1<<2) |
| 83 | #define OMAP_RTC_STATUS_RUN (1<<1) |
| 84 | #define OMAP_RTC_STATUS_BUSY (1<<0) |
| 85 | |
| 86 | /* OMAP_RTC_INTERRUPTS_REG bit fields: */ |
| 87 | #define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3) |
| 88 | #define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2) |
| 89 | |
| 90 | |
| 91 | #define rtc_read(addr) omap_readb(OMAP_RTC_BASE + (addr)) |
| 92 | #define rtc_write(val, addr) omap_writeb(val, OMAP_RTC_BASE + (addr)) |
| 93 | |
| 94 | |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 95 | /* we rely on the rtc framework to handle locking (rtc->ops_lock), |
| 96 | * so the only other requirement is that register accesses which |
| 97 | * require BUSY to be clear are made with IRQs locally disabled |
| 98 | */ |
| 99 | static void rtc_wait_not_busy(void) |
| 100 | { |
| 101 | int count = 0; |
| 102 | u8 status; |
| 103 | |
| 104 | /* BUSY may stay active for 1/32768 second (~30 usec) */ |
| 105 | for (count = 0; count < 50; count++) { |
| 106 | status = rtc_read(OMAP_RTC_STATUS_REG); |
| 107 | if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0) |
| 108 | break; |
| 109 | udelay(1); |
| 110 | } |
| 111 | /* now we have ~15 usec to read/write various registers */ |
| 112 | } |
| 113 | |
David Brownell | ab6a2d7 | 2007-05-08 00:33:30 -0700 | [diff] [blame] | 114 | static irqreturn_t rtc_irq(int irq, void *rtc) |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 115 | { |
| 116 | unsigned long events = 0; |
| 117 | u8 irq_data; |
| 118 | |
| 119 | irq_data = rtc_read(OMAP_RTC_STATUS_REG); |
| 120 | |
| 121 | /* alarm irq? */ |
| 122 | if (irq_data & OMAP_RTC_STATUS_ALARM) { |
| 123 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); |
| 124 | events |= RTC_IRQF | RTC_AF; |
| 125 | } |
| 126 | |
| 127 | /* 1/sec periodic/update irq? */ |
| 128 | if (irq_data & OMAP_RTC_STATUS_1S_EVENT) |
| 129 | events |= RTC_IRQF | RTC_UF; |
| 130 | |
David Brownell | ab6a2d7 | 2007-05-08 00:33:30 -0700 | [diff] [blame] | 131 | rtc_update_irq(rtc, 1, events); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 132 | |
| 133 | return IRQ_HANDLED; |
| 134 | } |
| 135 | |
| 136 | #ifdef CONFIG_RTC_INTF_DEV |
| 137 | |
| 138 | static int |
| 139 | omap_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
| 140 | { |
| 141 | u8 reg; |
| 142 | |
| 143 | switch (cmd) { |
| 144 | case RTC_AIE_OFF: |
| 145 | case RTC_AIE_ON: |
| 146 | case RTC_UIE_OFF: |
| 147 | case RTC_UIE_ON: |
| 148 | break; |
| 149 | default: |
| 150 | return -ENOIOCTLCMD; |
| 151 | } |
| 152 | |
| 153 | local_irq_disable(); |
| 154 | rtc_wait_not_busy(); |
| 155 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); |
| 156 | switch (cmd) { |
| 157 | /* AIE = Alarm Interrupt Enable */ |
| 158 | case RTC_AIE_OFF: |
| 159 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; |
| 160 | break; |
| 161 | case RTC_AIE_ON: |
| 162 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; |
| 163 | break; |
| 164 | /* UIE = Update Interrupt Enable (1/second) */ |
| 165 | case RTC_UIE_OFF: |
| 166 | reg &= ~OMAP_RTC_INTERRUPTS_IT_TIMER; |
| 167 | break; |
| 168 | case RTC_UIE_ON: |
| 169 | reg |= OMAP_RTC_INTERRUPTS_IT_TIMER; |
| 170 | break; |
| 171 | } |
| 172 | rtc_wait_not_busy(); |
| 173 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); |
| 174 | local_irq_enable(); |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | #else |
| 180 | #define omap_rtc_ioctl NULL |
| 181 | #endif |
| 182 | |
| 183 | /* this hardware doesn't support "don't care" alarm fields */ |
| 184 | static int tm2bcd(struct rtc_time *tm) |
| 185 | { |
| 186 | if (rtc_valid_tm(tm) != 0) |
| 187 | return -EINVAL; |
| 188 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 189 | tm->tm_sec = bin2bcd(tm->tm_sec); |
| 190 | tm->tm_min = bin2bcd(tm->tm_min); |
| 191 | tm->tm_hour = bin2bcd(tm->tm_hour); |
| 192 | tm->tm_mday = bin2bcd(tm->tm_mday); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 193 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 194 | tm->tm_mon = bin2bcd(tm->tm_mon + 1); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 195 | |
| 196 | /* epoch == 1900 */ |
| 197 | if (tm->tm_year < 100 || tm->tm_year > 199) |
| 198 | return -EINVAL; |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 199 | tm->tm_year = bin2bcd(tm->tm_year - 100); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static void bcd2tm(struct rtc_time *tm) |
| 205 | { |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 206 | tm->tm_sec = bcd2bin(tm->tm_sec); |
| 207 | tm->tm_min = bcd2bin(tm->tm_min); |
| 208 | tm->tm_hour = bcd2bin(tm->tm_hour); |
| 209 | tm->tm_mday = bcd2bin(tm->tm_mday); |
| 210 | tm->tm_mon = bcd2bin(tm->tm_mon) - 1; |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 211 | /* epoch == 1900 */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 212 | tm->tm_year = bcd2bin(tm->tm_year) + 100; |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | |
| 216 | static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 217 | { |
| 218 | /* we don't report wday/yday/isdst ... */ |
| 219 | local_irq_disable(); |
| 220 | rtc_wait_not_busy(); |
| 221 | |
| 222 | tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG); |
| 223 | tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG); |
| 224 | tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG); |
| 225 | tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG); |
| 226 | tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG); |
| 227 | tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG); |
| 228 | |
| 229 | local_irq_enable(); |
| 230 | |
| 231 | bcd2tm(tm); |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 236 | { |
| 237 | if (tm2bcd(tm) < 0) |
| 238 | return -EINVAL; |
| 239 | local_irq_disable(); |
| 240 | rtc_wait_not_busy(); |
| 241 | |
| 242 | rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG); |
| 243 | rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG); |
| 244 | rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG); |
| 245 | rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG); |
| 246 | rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG); |
| 247 | rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG); |
| 248 | |
| 249 | local_irq_enable(); |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 255 | { |
| 256 | local_irq_disable(); |
| 257 | rtc_wait_not_busy(); |
| 258 | |
| 259 | alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG); |
| 260 | alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG); |
| 261 | alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG); |
| 262 | alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG); |
| 263 | alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG); |
| 264 | alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG); |
| 265 | |
| 266 | local_irq_enable(); |
| 267 | |
| 268 | bcd2tm(&alm->time); |
David Brownell | a2db8df | 2006-12-13 00:35:08 -0800 | [diff] [blame] | 269 | alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG) |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 270 | & OMAP_RTC_INTERRUPTS_IT_ALARM); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 276 | { |
| 277 | u8 reg; |
| 278 | |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 279 | if (tm2bcd(&alm->time) < 0) |
| 280 | return -EINVAL; |
| 281 | |
| 282 | local_irq_disable(); |
| 283 | rtc_wait_not_busy(); |
| 284 | |
| 285 | rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG); |
| 286 | rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG); |
| 287 | rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG); |
| 288 | rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG); |
| 289 | rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG); |
| 290 | rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG); |
| 291 | |
| 292 | reg = rtc_read(OMAP_RTC_INTERRUPTS_REG); |
| 293 | if (alm->enabled) |
| 294 | reg |= OMAP_RTC_INTERRUPTS_IT_ALARM; |
| 295 | else |
| 296 | reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM; |
| 297 | rtc_write(reg, OMAP_RTC_INTERRUPTS_REG); |
| 298 | |
| 299 | local_irq_enable(); |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | static struct rtc_class_ops omap_rtc_ops = { |
| 305 | .ioctl = omap_rtc_ioctl, |
| 306 | .read_time = omap_rtc_read_time, |
| 307 | .set_time = omap_rtc_set_time, |
| 308 | .read_alarm = omap_rtc_read_alarm, |
| 309 | .set_alarm = omap_rtc_set_alarm, |
| 310 | }; |
| 311 | |
| 312 | static int omap_rtc_alarm; |
| 313 | static int omap_rtc_timer; |
| 314 | |
David Brownell | 71fc822 | 2008-07-23 21:30:38 -0700 | [diff] [blame] | 315 | static int __init omap_rtc_probe(struct platform_device *pdev) |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 316 | { |
| 317 | struct resource *res, *mem; |
| 318 | struct rtc_device *rtc; |
| 319 | u8 reg, new_ctrl; |
| 320 | |
| 321 | omap_rtc_timer = platform_get_irq(pdev, 0); |
| 322 | if (omap_rtc_timer <= 0) { |
| 323 | pr_debug("%s: no update irq?\n", pdev->name); |
| 324 | return -ENOENT; |
| 325 | } |
| 326 | |
| 327 | omap_rtc_alarm = platform_get_irq(pdev, 1); |
| 328 | if (omap_rtc_alarm <= 0) { |
| 329 | pr_debug("%s: no alarm irq?\n", pdev->name); |
| 330 | return -ENOENT; |
| 331 | } |
| 332 | |
| 333 | /* NOTE: using static mapping for RTC registers */ |
| 334 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 335 | if (res && res->start != OMAP_RTC_BASE) { |
| 336 | pr_debug("%s: RTC registers at %08x, expected %08x\n", |
| 337 | pdev->name, (unsigned) res->start, OMAP_RTC_BASE); |
| 338 | return -ENOENT; |
| 339 | } |
| 340 | |
| 341 | if (res) |
| 342 | mem = request_mem_region(res->start, |
| 343 | res->end - res->start + 1, |
| 344 | pdev->name); |
| 345 | else |
| 346 | mem = NULL; |
| 347 | if (!mem) { |
| 348 | pr_debug("%s: RTC registers at %08x are not free\n", |
| 349 | pdev->name, OMAP_RTC_BASE); |
| 350 | return -EBUSY; |
| 351 | } |
| 352 | |
| 353 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
| 354 | &omap_rtc_ops, THIS_MODULE); |
| 355 | if (IS_ERR(rtc)) { |
| 356 | pr_debug("%s: can't register RTC device, err %ld\n", |
| 357 | pdev->name, PTR_ERR(rtc)); |
| 358 | goto fail; |
| 359 | } |
| 360 | platform_set_drvdata(pdev, rtc); |
David Brownell | 558a40f | 2007-05-16 22:11:14 -0700 | [diff] [blame] | 361 | dev_set_drvdata(&rtc->dev, mem); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 362 | |
| 363 | /* clear pending irqs, and set 1/second periodic, |
| 364 | * which we'll use instead of update irqs |
| 365 | */ |
| 366 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); |
| 367 | |
| 368 | /* clear old status */ |
| 369 | reg = rtc_read(OMAP_RTC_STATUS_REG); |
| 370 | if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) { |
| 371 | pr_info("%s: RTC power up reset detected\n", |
| 372 | pdev->name); |
| 373 | rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG); |
| 374 | } |
| 375 | if (reg & (u8) OMAP_RTC_STATUS_ALARM) |
| 376 | rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG); |
| 377 | |
| 378 | /* handle periodic and alarm irqs */ |
Thomas Gleixner | 38515e9 | 2007-02-14 00:33:16 -0800 | [diff] [blame] | 379 | if (request_irq(omap_rtc_timer, rtc_irq, IRQF_DISABLED, |
David Brownell | cd96620 | 2007-05-08 00:33:40 -0700 | [diff] [blame] | 380 | rtc->dev.bus_id, rtc)) { |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 381 | pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n", |
| 382 | pdev->name, omap_rtc_timer); |
| 383 | goto fail0; |
| 384 | } |
Thomas Gleixner | 38515e9 | 2007-02-14 00:33:16 -0800 | [diff] [blame] | 385 | if (request_irq(omap_rtc_alarm, rtc_irq, IRQF_DISABLED, |
David Brownell | cd96620 | 2007-05-08 00:33:40 -0700 | [diff] [blame] | 386 | rtc->dev.bus_id, rtc)) { |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 387 | pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n", |
| 388 | pdev->name, omap_rtc_alarm); |
| 389 | goto fail1; |
| 390 | } |
| 391 | |
| 392 | /* On boards with split power, RTC_ON_NOFF won't reset the RTC */ |
| 393 | reg = rtc_read(OMAP_RTC_CTRL_REG); |
| 394 | if (reg & (u8) OMAP_RTC_CTRL_STOP) |
| 395 | pr_info("%s: already running\n", pdev->name); |
| 396 | |
| 397 | /* force to 24 hour mode */ |
| 398 | new_ctrl = reg & ~(OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP); |
| 399 | new_ctrl |= OMAP_RTC_CTRL_STOP; |
| 400 | |
| 401 | /* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE: |
| 402 | * |
| 403 | * - Boards wired so that RTC_WAKE_INT does something, and muxed |
| 404 | * right (W13_1610_RTC_WAKE_INT is the default after chip reset), |
| 405 | * should initialize the device wakeup flag appropriately. |
| 406 | * |
| 407 | * - Boards wired so RTC_ON_nOFF is used as the reset signal, |
| 408 | * rather than nPWRON_RESET, should forcibly enable split |
| 409 | * power mode. (Some chip errata report that RTC_CTRL_SPLIT |
| 410 | * is write-only, and always reads as zero...) |
| 411 | */ |
| 412 | device_init_wakeup(&pdev->dev, 0); |
| 413 | |
| 414 | if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT) |
| 415 | pr_info("%s: split power mode\n", pdev->name); |
| 416 | |
| 417 | if (reg != new_ctrl) |
| 418 | rtc_write(new_ctrl, OMAP_RTC_CTRL_REG); |
| 419 | |
| 420 | return 0; |
| 421 | |
| 422 | fail1: |
| 423 | free_irq(omap_rtc_timer, NULL); |
| 424 | fail0: |
| 425 | rtc_device_unregister(rtc); |
| 426 | fail: |
| 427 | release_resource(mem); |
| 428 | return -EIO; |
| 429 | } |
| 430 | |
David Brownell | 71fc822 | 2008-07-23 21:30:38 -0700 | [diff] [blame] | 431 | static int __exit omap_rtc_remove(struct platform_device *pdev) |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 432 | { |
| 433 | struct rtc_device *rtc = platform_get_drvdata(pdev);; |
| 434 | |
| 435 | device_init_wakeup(&pdev->dev, 0); |
| 436 | |
| 437 | /* leave rtc running, but disable irqs */ |
| 438 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); |
| 439 | |
| 440 | free_irq(omap_rtc_timer, rtc); |
| 441 | free_irq(omap_rtc_alarm, rtc); |
| 442 | |
David Brownell | 558a40f | 2007-05-16 22:11:14 -0700 | [diff] [blame] | 443 | release_resource(dev_get_drvdata(&rtc->dev)); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 444 | rtc_device_unregister(rtc); |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | #ifdef CONFIG_PM |
| 449 | |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 450 | static u8 irqstat; |
| 451 | |
| 452 | static int omap_rtc_suspend(struct platform_device *pdev, pm_message_t state) |
| 453 | { |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 454 | irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG); |
| 455 | |
| 456 | /* FIXME the RTC alarm is not currently acting as a wakeup event |
| 457 | * source, and in fact this enable() call is just saving a flag |
| 458 | * that's never used... |
| 459 | */ |
| 460 | if (device_may_wakeup(&pdev->dev)) |
| 461 | enable_irq_wake(omap_rtc_alarm); |
| 462 | else |
| 463 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); |
| 464 | |
| 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | static int omap_rtc_resume(struct platform_device *pdev) |
| 469 | { |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 470 | if (device_may_wakeup(&pdev->dev)) |
| 471 | disable_irq_wake(omap_rtc_alarm); |
| 472 | else |
| 473 | rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG); |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | #else |
| 478 | #define omap_rtc_suspend NULL |
| 479 | #define omap_rtc_resume NULL |
| 480 | #endif |
| 481 | |
| 482 | static void omap_rtc_shutdown(struct platform_device *pdev) |
| 483 | { |
| 484 | rtc_write(0, OMAP_RTC_INTERRUPTS_REG); |
| 485 | } |
| 486 | |
Kay Sievers | ad28a07 | 2008-04-10 21:29:25 -0700 | [diff] [blame] | 487 | MODULE_ALIAS("platform:omap_rtc"); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 488 | static struct platform_driver omap_rtc_driver = { |
David Brownell | 71fc822 | 2008-07-23 21:30:38 -0700 | [diff] [blame] | 489 | .remove = __exit_p(omap_rtc_remove), |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 490 | .suspend = omap_rtc_suspend, |
| 491 | .resume = omap_rtc_resume, |
| 492 | .shutdown = omap_rtc_shutdown, |
| 493 | .driver = { |
| 494 | .name = "omap_rtc", |
| 495 | .owner = THIS_MODULE, |
| 496 | }, |
| 497 | }; |
| 498 | |
| 499 | static int __init rtc_init(void) |
| 500 | { |
David Brownell | 71fc822 | 2008-07-23 21:30:38 -0700 | [diff] [blame] | 501 | return platform_driver_probe(&omap_rtc_driver, omap_rtc_probe); |
David Brownell | db68b18 | 2006-12-06 20:38:36 -0800 | [diff] [blame] | 502 | } |
| 503 | module_init(rtc_init); |
| 504 | |
| 505 | static void __exit rtc_exit(void) |
| 506 | { |
| 507 | platform_driver_unregister(&omap_rtc_driver); |
| 508 | } |
| 509 | module_exit(rtc_exit); |
| 510 | |
| 511 | MODULE_AUTHOR("George G. Davis (and others)"); |
| 512 | MODULE_LICENSE("GPL"); |