Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/rtc/rtc-spear.c |
| 3 | * |
| 4 | * Copyright (C) 2010 ST Microelectronics |
| 5 | * Rajeev Kumar<rajeev-dlh.kumar@st.com> |
| 6 | * |
| 7 | * This file is licensed under the terms of the GNU General Public |
| 8 | * License version 2. This program is licensed "as is" without any |
| 9 | * warranty of any kind, whether express or implied. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/bcd.h> |
| 13 | #include <linux/clk.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/irq.h> |
| 18 | #include <linux/module.h> |
Viresh Kumar | 0108c4f | 2012-05-29 15:07:35 -0700 | [diff] [blame] | 19 | #include <linux/of.h> |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/rtc.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | |
| 25 | /* RTC registers */ |
| 26 | #define TIME_REG 0x00 |
| 27 | #define DATE_REG 0x04 |
| 28 | #define ALARM_TIME_REG 0x08 |
| 29 | #define ALARM_DATE_REG 0x0C |
| 30 | #define CTRL_REG 0x10 |
| 31 | #define STATUS_REG 0x14 |
| 32 | |
| 33 | /* TIME_REG & ALARM_TIME_REG */ |
| 34 | #define SECONDS_UNITS (0xf<<0) /* seconds units position */ |
| 35 | #define SECONDS_TENS (0x7<<4) /* seconds tens position */ |
| 36 | #define MINUTES_UNITS (0xf<<8) /* minutes units position */ |
| 37 | #define MINUTES_TENS (0x7<<12) /* minutes tens position */ |
| 38 | #define HOURS_UNITS (0xf<<16) /* hours units position */ |
| 39 | #define HOURS_TENS (0x3<<20) /* hours tens position */ |
| 40 | |
| 41 | /* DATE_REG & ALARM_DATE_REG */ |
| 42 | #define DAYS_UNITS (0xf<<0) /* days units position */ |
| 43 | #define DAYS_TENS (0x3<<4) /* days tens position */ |
| 44 | #define MONTHS_UNITS (0xf<<8) /* months units position */ |
| 45 | #define MONTHS_TENS (0x1<<12) /* months tens position */ |
| 46 | #define YEARS_UNITS (0xf<<16) /* years units position */ |
| 47 | #define YEARS_TENS (0xf<<20) /* years tens position */ |
| 48 | #define YEARS_HUNDREDS (0xf<<24) /* years hundereds position */ |
| 49 | #define YEARS_MILLENIUMS (0xf<<28) /* years millenium position */ |
| 50 | |
| 51 | /* MASK SHIFT TIME_REG & ALARM_TIME_REG*/ |
| 52 | #define SECOND_SHIFT 0x00 /* seconds units */ |
| 53 | #define MINUTE_SHIFT 0x08 /* minutes units position */ |
| 54 | #define HOUR_SHIFT 0x10 /* hours units position */ |
| 55 | #define MDAY_SHIFT 0x00 /* Month day shift */ |
| 56 | #define MONTH_SHIFT 0x08 /* Month shift */ |
| 57 | #define YEAR_SHIFT 0x10 /* Year shift */ |
| 58 | |
| 59 | #define SECOND_MASK 0x7F |
| 60 | #define MIN_MASK 0x7F |
| 61 | #define HOUR_MASK 0x3F |
| 62 | #define DAY_MASK 0x3F |
| 63 | #define MONTH_MASK 0x7F |
| 64 | #define YEAR_MASK 0xFFFF |
| 65 | |
| 66 | /* date reg equal to time reg, for debug only */ |
| 67 | #define TIME_BYP (1<<9) |
| 68 | #define INT_ENABLE (1<<31) /* interrupt enable */ |
| 69 | |
| 70 | /* STATUS_REG */ |
| 71 | #define CLK_UNCONNECTED (1<<0) |
| 72 | #define PEND_WR_TIME (1<<2) |
| 73 | #define PEND_WR_DATE (1<<3) |
| 74 | #define LOST_WR_TIME (1<<4) |
| 75 | #define LOST_WR_DATE (1<<5) |
| 76 | #define RTC_INT_MASK (1<<31) |
| 77 | #define STATUS_BUSY (PEND_WR_TIME | PEND_WR_DATE) |
| 78 | #define STATUS_FAIL (LOST_WR_TIME | LOST_WR_DATE) |
| 79 | |
| 80 | struct spear_rtc_config { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 81 | struct rtc_device *rtc; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 82 | struct clk *clk; |
| 83 | spinlock_t lock; |
| 84 | void __iomem *ioaddr; |
Deepak Sikri | cd0e08a | 2012-03-23 15:02:29 -0700 | [diff] [blame] | 85 | unsigned int irq_wake; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config) |
| 89 | { |
| 90 | unsigned int val; |
| 91 | unsigned long flags; |
| 92 | |
| 93 | spin_lock_irqsave(&config->lock, flags); |
| 94 | val = readl(config->ioaddr + STATUS_REG); |
| 95 | val |= RTC_INT_MASK; |
| 96 | writel(val, config->ioaddr + STATUS_REG); |
| 97 | spin_unlock_irqrestore(&config->lock, flags); |
| 98 | } |
| 99 | |
| 100 | static inline void spear_rtc_enable_interrupt(struct spear_rtc_config *config) |
| 101 | { |
| 102 | unsigned int val; |
| 103 | |
| 104 | val = readl(config->ioaddr + CTRL_REG); |
| 105 | if (!(val & INT_ENABLE)) { |
| 106 | spear_rtc_clear_interrupt(config); |
| 107 | val |= INT_ENABLE; |
| 108 | writel(val, config->ioaddr + CTRL_REG); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static inline void spear_rtc_disable_interrupt(struct spear_rtc_config *config) |
| 113 | { |
| 114 | unsigned int val; |
| 115 | |
| 116 | val = readl(config->ioaddr + CTRL_REG); |
| 117 | if (val & INT_ENABLE) { |
| 118 | val &= ~INT_ENABLE; |
| 119 | writel(val, config->ioaddr + CTRL_REG); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | static inline int is_write_complete(struct spear_rtc_config *config) |
| 124 | { |
| 125 | int ret = 0; |
| 126 | unsigned long flags; |
| 127 | |
| 128 | spin_lock_irqsave(&config->lock, flags); |
| 129 | if ((readl(config->ioaddr + STATUS_REG)) & STATUS_FAIL) |
| 130 | ret = -EIO; |
| 131 | spin_unlock_irqrestore(&config->lock, flags); |
| 132 | |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | static void rtc_wait_not_busy(struct spear_rtc_config *config) |
| 137 | { |
| 138 | int status, count = 0; |
| 139 | unsigned long flags; |
| 140 | |
| 141 | /* Assuming BUSY may stay active for 80 msec) */ |
| 142 | for (count = 0; count < 80; count++) { |
| 143 | spin_lock_irqsave(&config->lock, flags); |
| 144 | status = readl(config->ioaddr + STATUS_REG); |
| 145 | spin_unlock_irqrestore(&config->lock, flags); |
| 146 | if ((status & STATUS_BUSY) == 0) |
| 147 | break; |
| 148 | /* check status busy, after each msec */ |
| 149 | msleep(1); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | static irqreturn_t spear_rtc_irq(int irq, void *dev_id) |
| 154 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 155 | struct spear_rtc_config *config = dev_id; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 156 | unsigned long flags, events = 0; |
| 157 | unsigned int irq_data; |
| 158 | |
| 159 | spin_lock_irqsave(&config->lock, flags); |
| 160 | irq_data = readl(config->ioaddr + STATUS_REG); |
| 161 | spin_unlock_irqrestore(&config->lock, flags); |
| 162 | |
| 163 | if ((irq_data & RTC_INT_MASK)) { |
| 164 | spear_rtc_clear_interrupt(config); |
| 165 | events = RTC_IRQF | RTC_AF; |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 166 | rtc_update_irq(config->rtc, 1, events); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 167 | return IRQ_HANDLED; |
| 168 | } else |
| 169 | return IRQ_NONE; |
| 170 | |
| 171 | } |
| 172 | |
| 173 | static int tm2bcd(struct rtc_time *tm) |
| 174 | { |
| 175 | if (rtc_valid_tm(tm) != 0) |
| 176 | return -EINVAL; |
| 177 | tm->tm_sec = bin2bcd(tm->tm_sec); |
| 178 | tm->tm_min = bin2bcd(tm->tm_min); |
| 179 | tm->tm_hour = bin2bcd(tm->tm_hour); |
| 180 | tm->tm_mday = bin2bcd(tm->tm_mday); |
| 181 | tm->tm_mon = bin2bcd(tm->tm_mon + 1); |
| 182 | tm->tm_year = bin2bcd(tm->tm_year); |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static void bcd2tm(struct rtc_time *tm) |
| 188 | { |
| 189 | tm->tm_sec = bcd2bin(tm->tm_sec); |
| 190 | tm->tm_min = bcd2bin(tm->tm_min); |
| 191 | tm->tm_hour = bcd2bin(tm->tm_hour); |
| 192 | tm->tm_mday = bcd2bin(tm->tm_mday); |
| 193 | tm->tm_mon = bcd2bin(tm->tm_mon) - 1; |
| 194 | /* epoch == 1900 */ |
| 195 | tm->tm_year = bcd2bin(tm->tm_year); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * spear_rtc_read_time - set the time |
| 200 | * @dev: rtc device in use |
| 201 | * @tm: holds date and time |
| 202 | * |
| 203 | * This function read time and date. On success it will return 0 |
| 204 | * otherwise -ve error is returned. |
| 205 | */ |
| 206 | static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 207 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 208 | struct spear_rtc_config *config = dev_get_drvdata(dev); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 209 | unsigned int time, date; |
| 210 | |
| 211 | /* we don't report wday/yday/isdst ... */ |
| 212 | rtc_wait_not_busy(config); |
| 213 | |
| 214 | time = readl(config->ioaddr + TIME_REG); |
| 215 | date = readl(config->ioaddr + DATE_REG); |
| 216 | tm->tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK; |
| 217 | tm->tm_min = (time >> MINUTE_SHIFT) & MIN_MASK; |
| 218 | tm->tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK; |
| 219 | tm->tm_mday = (date >> MDAY_SHIFT) & DAY_MASK; |
| 220 | tm->tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK; |
| 221 | tm->tm_year = (date >> YEAR_SHIFT) & YEAR_MASK; |
| 222 | |
| 223 | bcd2tm(tm); |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * spear_rtc_set_time - set the time |
| 229 | * @dev: rtc device in use |
| 230 | * @tm: holds date and time |
| 231 | * |
| 232 | * This function set time and date. On success it will return 0 |
| 233 | * otherwise -ve error is returned. |
| 234 | */ |
| 235 | static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 236 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 237 | struct spear_rtc_config *config = dev_get_drvdata(dev); |
Lars-Peter Clausen | a16e839 | 2012-10-04 17:14:01 -0700 | [diff] [blame] | 238 | unsigned int time, date; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 239 | |
| 240 | if (tm2bcd(tm) < 0) |
| 241 | return -EINVAL; |
| 242 | |
| 243 | rtc_wait_not_busy(config); |
| 244 | time = (tm->tm_sec << SECOND_SHIFT) | (tm->tm_min << MINUTE_SHIFT) | |
| 245 | (tm->tm_hour << HOUR_SHIFT); |
| 246 | date = (tm->tm_mday << MDAY_SHIFT) | (tm->tm_mon << MONTH_SHIFT) | |
| 247 | (tm->tm_year << YEAR_SHIFT); |
| 248 | writel(time, config->ioaddr + TIME_REG); |
| 249 | writel(date, config->ioaddr + DATE_REG); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 250 | |
Lars-Peter Clausen | a16e839 | 2012-10-04 17:14:01 -0700 | [diff] [blame] | 251 | return is_write_complete(config); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | /* |
| 255 | * spear_rtc_read_alarm - read the alarm time |
| 256 | * @dev: rtc device in use |
| 257 | * @alm: holds alarm date and time |
| 258 | * |
| 259 | * This function read alarm time and date. On success it will return 0 |
| 260 | * otherwise -ve error is returned. |
| 261 | */ |
| 262 | static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 263 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 264 | struct spear_rtc_config *config = dev_get_drvdata(dev); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 265 | unsigned int time, date; |
| 266 | |
| 267 | rtc_wait_not_busy(config); |
| 268 | |
| 269 | time = readl(config->ioaddr + ALARM_TIME_REG); |
| 270 | date = readl(config->ioaddr + ALARM_DATE_REG); |
| 271 | alm->time.tm_sec = (time >> SECOND_SHIFT) & SECOND_MASK; |
| 272 | alm->time.tm_min = (time >> MINUTE_SHIFT) & MIN_MASK; |
| 273 | alm->time.tm_hour = (time >> HOUR_SHIFT) & HOUR_MASK; |
| 274 | alm->time.tm_mday = (date >> MDAY_SHIFT) & DAY_MASK; |
| 275 | alm->time.tm_mon = (date >> MONTH_SHIFT) & MONTH_MASK; |
| 276 | alm->time.tm_year = (date >> YEAR_SHIFT) & YEAR_MASK; |
| 277 | |
| 278 | bcd2tm(&alm->time); |
| 279 | alm->enabled = readl(config->ioaddr + CTRL_REG) & INT_ENABLE; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * spear_rtc_set_alarm - set the alarm time |
| 286 | * @dev: rtc device in use |
| 287 | * @alm: holds alarm date and time |
| 288 | * |
| 289 | * This function set alarm time and date. On success it will return 0 |
| 290 | * otherwise -ve error is returned. |
| 291 | */ |
| 292 | static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
| 293 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 294 | struct spear_rtc_config *config = dev_get_drvdata(dev); |
Lars-Peter Clausen | a16e839 | 2012-10-04 17:14:01 -0700 | [diff] [blame] | 295 | unsigned int time, date; |
| 296 | int err; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 297 | |
| 298 | if (tm2bcd(&alm->time) < 0) |
| 299 | return -EINVAL; |
| 300 | |
| 301 | rtc_wait_not_busy(config); |
| 302 | |
| 303 | time = (alm->time.tm_sec << SECOND_SHIFT) | (alm->time.tm_min << |
| 304 | MINUTE_SHIFT) | (alm->time.tm_hour << HOUR_SHIFT); |
| 305 | date = (alm->time.tm_mday << MDAY_SHIFT) | (alm->time.tm_mon << |
| 306 | MONTH_SHIFT) | (alm->time.tm_year << YEAR_SHIFT); |
| 307 | |
| 308 | writel(time, config->ioaddr + ALARM_TIME_REG); |
| 309 | writel(date, config->ioaddr + ALARM_DATE_REG); |
| 310 | err = is_write_complete(config); |
| 311 | if (err < 0) |
| 312 | return err; |
| 313 | |
| 314 | if (alm->enabled) |
| 315 | spear_rtc_enable_interrupt(config); |
| 316 | else |
| 317 | spear_rtc_disable_interrupt(config); |
| 318 | |
| 319 | return 0; |
| 320 | } |
Shiraz Hashim | 131f8b7 | 2012-03-23 15:02:29 -0700 | [diff] [blame] | 321 | |
| 322 | static int spear_alarm_irq_enable(struct device *dev, unsigned int enabled) |
| 323 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 324 | struct spear_rtc_config *config = dev_get_drvdata(dev); |
Shiraz Hashim | 131f8b7 | 2012-03-23 15:02:29 -0700 | [diff] [blame] | 325 | int ret = 0; |
| 326 | |
| 327 | spear_rtc_clear_interrupt(config); |
| 328 | |
| 329 | switch (enabled) { |
| 330 | case 0: |
| 331 | /* alarm off */ |
| 332 | spear_rtc_disable_interrupt(config); |
| 333 | break; |
| 334 | case 1: |
| 335 | /* alarm on */ |
| 336 | spear_rtc_enable_interrupt(config); |
| 337 | break; |
| 338 | default: |
| 339 | ret = -EINVAL; |
| 340 | break; |
| 341 | } |
| 342 | |
| 343 | return ret; |
| 344 | } |
| 345 | |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 346 | static struct rtc_class_ops spear_rtc_ops = { |
| 347 | .read_time = spear_rtc_read_time, |
| 348 | .set_time = spear_rtc_set_time, |
| 349 | .read_alarm = spear_rtc_read_alarm, |
| 350 | .set_alarm = spear_rtc_set_alarm, |
Shiraz Hashim | 131f8b7 | 2012-03-23 15:02:29 -0700 | [diff] [blame] | 351 | .alarm_irq_enable = spear_alarm_irq_enable, |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 352 | }; |
| 353 | |
| 354 | static int __devinit spear_rtc_probe(struct platform_device *pdev) |
| 355 | { |
| 356 | struct resource *res; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 357 | struct spear_rtc_config *config; |
Lars-Peter Clausen | a16e839 | 2012-10-04 17:14:01 -0700 | [diff] [blame] | 358 | int status = 0; |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 359 | int irq; |
| 360 | |
| 361 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 362 | if (!res) { |
| 363 | dev_err(&pdev->dev, "no resource defined\n"); |
| 364 | return -EBUSY; |
| 365 | } |
| 366 | if (!request_mem_region(res->start, resource_size(res), pdev->name)) { |
| 367 | dev_err(&pdev->dev, "rtc region already claimed\n"); |
| 368 | return -EBUSY; |
| 369 | } |
| 370 | |
| 371 | config = kzalloc(sizeof(*config), GFP_KERNEL); |
| 372 | if (!config) { |
| 373 | dev_err(&pdev->dev, "out of memory\n"); |
| 374 | status = -ENOMEM; |
| 375 | goto err_release_region; |
| 376 | } |
| 377 | |
| 378 | config->clk = clk_get(&pdev->dev, NULL); |
| 379 | if (IS_ERR(config->clk)) { |
| 380 | status = PTR_ERR(config->clk); |
| 381 | goto err_kfree; |
| 382 | } |
| 383 | |
| 384 | status = clk_enable(config->clk); |
| 385 | if (status < 0) |
| 386 | goto err_clk_put; |
| 387 | |
| 388 | config->ioaddr = ioremap(res->start, resource_size(res)); |
| 389 | if (!config->ioaddr) { |
| 390 | dev_err(&pdev->dev, "ioremap fail\n"); |
| 391 | status = -ENOMEM; |
| 392 | goto err_disable_clock; |
| 393 | } |
| 394 | |
| 395 | spin_lock_init(&config->lock); |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 396 | platform_set_drvdata(pdev, config); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 397 | |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 398 | config->rtc = rtc_device_register(pdev->name, &pdev->dev, |
| 399 | &spear_rtc_ops, THIS_MODULE); |
| 400 | if (IS_ERR(config->rtc)) { |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 401 | dev_err(&pdev->dev, "can't register RTC device, err %ld\n", |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 402 | PTR_ERR(config->rtc)); |
| 403 | status = PTR_ERR(config->rtc); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 404 | goto err_iounmap; |
| 405 | } |
| 406 | |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 407 | /* alarm irqs */ |
| 408 | irq = platform_get_irq(pdev, 0); |
| 409 | if (irq < 0) { |
| 410 | dev_err(&pdev->dev, "no update irq?\n"); |
| 411 | status = irq; |
| 412 | goto err_clear_platdata; |
| 413 | } |
| 414 | |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 415 | status = request_irq(irq, spear_rtc_irq, 0, pdev->name, config); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 416 | if (status) { |
| 417 | dev_err(&pdev->dev, "Alarm interrupt IRQ%d already \ |
| 418 | claimed\n", irq); |
| 419 | goto err_clear_platdata; |
| 420 | } |
| 421 | |
| 422 | if (!device_can_wakeup(&pdev->dev)) |
| 423 | device_init_wakeup(&pdev->dev, 1); |
| 424 | |
| 425 | return 0; |
| 426 | |
| 427 | err_clear_platdata: |
| 428 | platform_set_drvdata(pdev, NULL); |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 429 | rtc_device_unregister(config->rtc); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 430 | err_iounmap: |
| 431 | iounmap(config->ioaddr); |
| 432 | err_disable_clock: |
| 433 | clk_disable(config->clk); |
| 434 | err_clk_put: |
| 435 | clk_put(config->clk); |
| 436 | err_kfree: |
| 437 | kfree(config); |
| 438 | err_release_region: |
| 439 | release_mem_region(res->start, resource_size(res)); |
| 440 | |
| 441 | return status; |
| 442 | } |
| 443 | |
| 444 | static int __devexit spear_rtc_remove(struct platform_device *pdev) |
| 445 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 446 | struct spear_rtc_config *config = platform_get_drvdata(pdev); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 447 | int irq; |
| 448 | struct resource *res; |
| 449 | |
| 450 | /* leave rtc running, but disable irqs */ |
| 451 | spear_rtc_disable_interrupt(config); |
| 452 | device_init_wakeup(&pdev->dev, 0); |
| 453 | irq = platform_get_irq(pdev, 0); |
| 454 | if (irq) |
| 455 | free_irq(irq, pdev); |
| 456 | clk_disable(config->clk); |
| 457 | clk_put(config->clk); |
| 458 | iounmap(config->ioaddr); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 459 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 460 | if (res) |
| 461 | release_mem_region(res->start, resource_size(res)); |
| 462 | platform_set_drvdata(pdev, NULL); |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 463 | rtc_device_unregister(config->rtc); |
Devendra Naga | 2a64389 | 2012-07-11 14:01:53 -0700 | [diff] [blame] | 464 | kfree(config); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 465 | |
| 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | #ifdef CONFIG_PM |
| 470 | |
| 471 | static int spear_rtc_suspend(struct platform_device *pdev, pm_message_t state) |
| 472 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 473 | struct spear_rtc_config *config = platform_get_drvdata(pdev); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 474 | int irq; |
| 475 | |
| 476 | irq = platform_get_irq(pdev, 0); |
Deepak Sikri | cd0e08a | 2012-03-23 15:02:29 -0700 | [diff] [blame] | 477 | if (device_may_wakeup(&pdev->dev)) { |
| 478 | if (!enable_irq_wake(irq)) |
| 479 | config->irq_wake = 1; |
| 480 | } else { |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 481 | spear_rtc_disable_interrupt(config); |
| 482 | clk_disable(config->clk); |
| 483 | } |
| 484 | |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | static int spear_rtc_resume(struct platform_device *pdev) |
| 489 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 490 | struct spear_rtc_config *config = platform_get_drvdata(pdev); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 491 | int irq; |
| 492 | |
| 493 | irq = platform_get_irq(pdev, 0); |
| 494 | |
Deepak Sikri | cd0e08a | 2012-03-23 15:02:29 -0700 | [diff] [blame] | 495 | if (device_may_wakeup(&pdev->dev)) { |
| 496 | if (config->irq_wake) { |
| 497 | disable_irq_wake(irq); |
| 498 | config->irq_wake = 0; |
| 499 | } |
| 500 | } else { |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 501 | clk_enable(config->clk); |
| 502 | spear_rtc_enable_interrupt(config); |
| 503 | } |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | #else |
| 509 | #define spear_rtc_suspend NULL |
| 510 | #define spear_rtc_resume NULL |
| 511 | #endif |
| 512 | |
| 513 | static void spear_rtc_shutdown(struct platform_device *pdev) |
| 514 | { |
Viresh Kumar | ee6c54c | 2012-03-23 15:02:30 -0700 | [diff] [blame] | 515 | struct spear_rtc_config *config = platform_get_drvdata(pdev); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 516 | |
| 517 | spear_rtc_disable_interrupt(config); |
| 518 | clk_disable(config->clk); |
| 519 | } |
| 520 | |
Viresh Kumar | 0108c4f | 2012-05-29 15:07:35 -0700 | [diff] [blame] | 521 | #ifdef CONFIG_OF |
| 522 | static const struct of_device_id spear_rtc_id_table[] = { |
| 523 | { .compatible = "st,spear600-rtc" }, |
| 524 | {} |
| 525 | }; |
| 526 | MODULE_DEVICE_TABLE(of, spear_rtc_id_table); |
| 527 | #endif |
| 528 | |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 529 | static struct platform_driver spear_rtc_driver = { |
| 530 | .probe = spear_rtc_probe, |
| 531 | .remove = __devexit_p(spear_rtc_remove), |
| 532 | .suspend = spear_rtc_suspend, |
| 533 | .resume = spear_rtc_resume, |
| 534 | .shutdown = spear_rtc_shutdown, |
| 535 | .driver = { |
| 536 | .name = "rtc-spear", |
Viresh Kumar | 0108c4f | 2012-05-29 15:07:35 -0700 | [diff] [blame] | 537 | .of_match_table = of_match_ptr(spear_rtc_id_table), |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 538 | }, |
| 539 | }; |
| 540 | |
Axel Lin | 0c4eae6 | 2012-01-10 15:10:48 -0800 | [diff] [blame] | 541 | module_platform_driver(spear_rtc_driver); |
Rajeev Kumar | 0942a71 | 2011-05-26 16:25:09 -0700 | [diff] [blame] | 542 | |
| 543 | MODULE_ALIAS("platform:rtc-spear"); |
| 544 | MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>"); |
| 545 | MODULE_DESCRIPTION("ST SPEAr Realtime Clock Driver (RTC)"); |
| 546 | MODULE_LICENSE("GPL"); |