Thomas Gleixner | af873fc | 2019-05-28 09:57:21 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) ST-Ericsson SA 2010 |
| 4 | * |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 5 | * Author: Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com> |
| 6 | * |
| 7 | * RTC clock driver for the RTC part of the AB8500 Power management chip. |
| 8 | * Based on RTC clock driver for the AB3100 Analog Baseband Chip by |
| 9 | * Linus Walleij <linus.walleij@stericsson.com> |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/rtc.h> |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 17 | #include <linux/mfd/abx500.h> |
Linus Walleij | ee66e65 | 2011-12-02 14:16:33 +0100 | [diff] [blame] | 18 | #include <linux/mfd/abx500/ab8500.h> |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 19 | #include <linux/delay.h> |
Lee Jones | ad49fcb | 2012-07-11 14:02:17 -0700 | [diff] [blame] | 20 | #include <linux/of.h> |
Sudeep Holla | 93a6f91 | 2015-09-21 16:46:58 +0100 | [diff] [blame] | 21 | #include <linux/pm_wakeirq.h> |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 22 | |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 23 | #define AB8500_RTC_SOFF_STAT_REG 0x00 |
| 24 | #define AB8500_RTC_CC_CONF_REG 0x01 |
| 25 | #define AB8500_RTC_READ_REQ_REG 0x02 |
| 26 | #define AB8500_RTC_WATCH_TSECMID_REG 0x03 |
| 27 | #define AB8500_RTC_WATCH_TSECHI_REG 0x04 |
| 28 | #define AB8500_RTC_WATCH_TMIN_LOW_REG 0x05 |
| 29 | #define AB8500_RTC_WATCH_TMIN_MID_REG 0x06 |
| 30 | #define AB8500_RTC_WATCH_TMIN_HI_REG 0x07 |
| 31 | #define AB8500_RTC_ALRM_MIN_LOW_REG 0x08 |
| 32 | #define AB8500_RTC_ALRM_MIN_MID_REG 0x09 |
| 33 | #define AB8500_RTC_ALRM_MIN_HI_REG 0x0A |
| 34 | #define AB8500_RTC_STAT_REG 0x0B |
| 35 | #define AB8500_RTC_BKUP_CHG_REG 0x0C |
| 36 | #define AB8500_RTC_FORCE_BKUP_REG 0x0D |
| 37 | #define AB8500_RTC_CALIB_REG 0x0E |
| 38 | #define AB8500_RTC_SWITCH_STAT_REG 0x0F |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 39 | |
| 40 | /* RtcReadRequest bits */ |
| 41 | #define RTC_READ_REQUEST 0x01 |
| 42 | #define RTC_WRITE_REQUEST 0x02 |
| 43 | |
| 44 | /* RtcCtrl bits */ |
| 45 | #define RTC_ALARM_ENA 0x04 |
| 46 | #define RTC_STATUS_DATA 0x01 |
| 47 | |
| 48 | #define COUNTS_PER_SEC (0xF000 / 60) |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 49 | |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 50 | static const u8 ab8500_rtc_time_regs[] = { |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 51 | AB8500_RTC_WATCH_TMIN_HI_REG, AB8500_RTC_WATCH_TMIN_MID_REG, |
| 52 | AB8500_RTC_WATCH_TMIN_LOW_REG, AB8500_RTC_WATCH_TSECHI_REG, |
| 53 | AB8500_RTC_WATCH_TSECMID_REG |
| 54 | }; |
| 55 | |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 56 | static const u8 ab8500_rtc_alarm_regs[] = { |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 57 | AB8500_RTC_ALRM_MIN_HI_REG, AB8500_RTC_ALRM_MIN_MID_REG, |
| 58 | AB8500_RTC_ALRM_MIN_LOW_REG |
| 59 | }; |
| 60 | |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 61 | static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 62 | { |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 63 | unsigned long timeout = jiffies + HZ; |
| 64 | int retval, i; |
| 65 | unsigned long mins, secs; |
| 66 | unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)]; |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 67 | u8 value; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 68 | |
| 69 | /* Request a data read */ |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 70 | retval = abx500_set_register_interruptible(dev, |
| 71 | AB8500_RTC, AB8500_RTC_READ_REQ_REG, RTC_READ_REQUEST); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 72 | if (retval < 0) |
| 73 | return retval; |
| 74 | |
Bengt Jonsson | 064407f1 | 2012-07-30 14:41:43 -0700 | [diff] [blame] | 75 | /* Wait for some cycles after enabling the rtc read in ab8500 */ |
| 76 | while (time_before(jiffies, timeout)) { |
| 77 | retval = abx500_get_register_interruptible(dev, |
| 78 | AB8500_RTC, AB8500_RTC_READ_REQ_REG, &value); |
| 79 | if (retval < 0) |
| 80 | return retval; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 81 | |
Bengt Jonsson | 064407f1 | 2012-07-30 14:41:43 -0700 | [diff] [blame] | 82 | if (!(value & RTC_READ_REQUEST)) |
| 83 | break; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 84 | |
Bengt Jonsson | 064407f1 | 2012-07-30 14:41:43 -0700 | [diff] [blame] | 85 | usleep_range(1000, 5000); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | /* Read the Watchtime registers */ |
| 89 | for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) { |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 90 | retval = abx500_get_register_interruptible(dev, |
| 91 | AB8500_RTC, ab8500_rtc_time_regs[i], &value); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 92 | if (retval < 0) |
| 93 | return retval; |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 94 | buf[i] = value; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | mins = (buf[0] << 16) | (buf[1] << 8) | buf[2]; |
| 98 | |
| 99 | secs = (buf[3] << 8) | buf[4]; |
| 100 | secs = secs / COUNTS_PER_SEC; |
| 101 | secs = secs + (mins * 60); |
| 102 | |
Alexandre Belloni | a5965a3 | 2020-03-06 02:01:01 +0100 | [diff] [blame] | 103 | rtc_time64_to_tm(secs, tm); |
Alexandre Belloni | ab62670 | 2018-02-19 16:23:55 +0100 | [diff] [blame] | 104 | return 0; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 108 | { |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 109 | int retval, i; |
| 110 | unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)]; |
| 111 | unsigned long no_secs, no_mins, secs = 0; |
| 112 | |
Alexandre Belloni | a5965a3 | 2020-03-06 02:01:01 +0100 | [diff] [blame] | 113 | secs = rtc_tm_to_time64(tm); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 114 | |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 115 | no_mins = secs / 60; |
| 116 | |
| 117 | no_secs = secs % 60; |
| 118 | /* Make the seconds count as per the RTC resolution */ |
| 119 | no_secs = no_secs * COUNTS_PER_SEC; |
| 120 | |
| 121 | buf[4] = no_secs & 0xFF; |
| 122 | buf[3] = (no_secs >> 8) & 0xFF; |
| 123 | |
| 124 | buf[2] = no_mins & 0xFF; |
| 125 | buf[1] = (no_mins >> 8) & 0xFF; |
| 126 | buf[0] = (no_mins >> 16) & 0xFF; |
| 127 | |
| 128 | for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) { |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 129 | retval = abx500_set_register_interruptible(dev, AB8500_RTC, |
| 130 | ab8500_rtc_time_regs[i], buf[i]); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 131 | if (retval < 0) |
| 132 | return retval; |
| 133 | } |
| 134 | |
| 135 | /* Request a data write */ |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 136 | return abx500_set_register_interruptible(dev, AB8500_RTC, |
| 137 | AB8500_RTC_READ_REQ_REG, RTC_WRITE_REQUEST); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static int ab8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
| 141 | { |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 142 | int retval, i; |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 143 | u8 rtc_ctrl, value; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 144 | unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)]; |
| 145 | unsigned long secs, mins; |
| 146 | |
| 147 | /* Check if the alarm is enabled or not */ |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 148 | retval = abx500_get_register_interruptible(dev, AB8500_RTC, |
| 149 | AB8500_RTC_STAT_REG, &rtc_ctrl); |
| 150 | if (retval < 0) |
| 151 | return retval; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 152 | |
| 153 | if (rtc_ctrl & RTC_ALARM_ENA) |
| 154 | alarm->enabled = 1; |
| 155 | else |
| 156 | alarm->enabled = 0; |
| 157 | |
| 158 | alarm->pending = 0; |
| 159 | |
| 160 | for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) { |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 161 | retval = abx500_get_register_interruptible(dev, AB8500_RTC, |
| 162 | ab8500_rtc_alarm_regs[i], &value); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 163 | if (retval < 0) |
| 164 | return retval; |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 165 | buf[i] = value; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | mins = (buf[0] << 16) | (buf[1] << 8) | (buf[2]); |
| 169 | secs = mins * 60; |
| 170 | |
Alexandre Belloni | a5965a3 | 2020-03-06 02:01:01 +0100 | [diff] [blame] | 171 | rtc_time64_to_tm(secs, &alarm->time); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 172 | |
Alexandre Belloni | 9a90a5b | 2018-09-24 16:49:02 +0200 | [diff] [blame] | 173 | return 0; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | static int ab8500_rtc_irq_enable(struct device *dev, unsigned int enabled) |
| 177 | { |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 178 | return abx500_mask_and_set_register_interruptible(dev, AB8500_RTC, |
| 179 | AB8500_RTC_STAT_REG, RTC_ALARM_ENA, |
| 180 | enabled ? RTC_ALARM_ENA : 0); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
| 184 | { |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 185 | int retval, i; |
| 186 | unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)]; |
Alexandre Belloni | a5f8280 | 2021-11-07 23:54:51 +0100 | [diff] [blame] | 187 | unsigned long mins; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 188 | |
Alexandre Belloni | a5f8280 | 2021-11-07 23:54:51 +0100 | [diff] [blame] | 189 | mins = (unsigned long)rtc_tm_to_time64(&alarm->time) / 60; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 190 | |
| 191 | buf[2] = mins & 0xFF; |
| 192 | buf[1] = (mins >> 8) & 0xFF; |
| 193 | buf[0] = (mins >> 16) & 0xFF; |
| 194 | |
| 195 | /* Set the alarm time */ |
| 196 | for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) { |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 197 | retval = abx500_set_register_interruptible(dev, AB8500_RTC, |
| 198 | ab8500_rtc_alarm_regs[i], buf[i]); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 199 | if (retval < 0) |
| 200 | return retval; |
| 201 | } |
| 202 | |
| 203 | return ab8500_rtc_irq_enable(dev, alarm->enabled); |
| 204 | } |
| 205 | |
Mark Godfrey | dda367a | 2012-01-10 15:10:42 -0800 | [diff] [blame] | 206 | static int ab8500_rtc_set_calibration(struct device *dev, int calibration) |
| 207 | { |
| 208 | int retval; |
| 209 | u8 rtccal = 0; |
| 210 | |
| 211 | /* |
| 212 | * Check that the calibration value (which is in units of 0.5 |
| 213 | * parts-per-million) is in the AB8500's range for RtcCalibration |
| 214 | * register. -128 (0x80) is not permitted because the AB8500 uses |
| 215 | * a sign-bit rather than two's complement, so 0x80 is just another |
| 216 | * representation of zero. |
| 217 | */ |
| 218 | if ((calibration < -127) || (calibration > 127)) { |
| 219 | dev_err(dev, "RtcCalibration value outside permitted range\n"); |
| 220 | return -EINVAL; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * The AB8500 uses sign (in bit7) and magnitude (in bits0-7) |
| 225 | * so need to convert to this sort of representation before writing |
| 226 | * into RtcCalibration register... |
| 227 | */ |
| 228 | if (calibration >= 0) |
| 229 | rtccal = 0x7F & calibration; |
| 230 | else |
| 231 | rtccal = ~(calibration - 1) | 0x80; |
| 232 | |
| 233 | retval = abx500_set_register_interruptible(dev, AB8500_RTC, |
| 234 | AB8500_RTC_CALIB_REG, rtccal); |
| 235 | |
| 236 | return retval; |
| 237 | } |
| 238 | |
| 239 | static int ab8500_rtc_get_calibration(struct device *dev, int *calibration) |
| 240 | { |
| 241 | int retval; |
| 242 | u8 rtccal = 0; |
| 243 | |
| 244 | retval = abx500_get_register_interruptible(dev, AB8500_RTC, |
| 245 | AB8500_RTC_CALIB_REG, &rtccal); |
| 246 | if (retval >= 0) { |
| 247 | /* |
| 248 | * The AB8500 uses sign (in bit7) and magnitude (in bits0-7) |
| 249 | * so need to convert value from RtcCalibration register into |
| 250 | * a two's complement signed value... |
| 251 | */ |
| 252 | if (rtccal & 0x80) |
| 253 | *calibration = 0 - (rtccal & 0x7F); |
| 254 | else |
| 255 | *calibration = 0x7F & rtccal; |
| 256 | } |
| 257 | |
| 258 | return retval; |
| 259 | } |
| 260 | |
| 261 | static ssize_t ab8500_sysfs_store_rtc_calibration(struct device *dev, |
| 262 | struct device_attribute *attr, |
| 263 | const char *buf, size_t count) |
| 264 | { |
| 265 | int retval; |
| 266 | int calibration = 0; |
| 267 | |
| 268 | if (sscanf(buf, " %i ", &calibration) != 1) { |
| 269 | dev_err(dev, "Failed to store RTC calibration attribute\n"); |
| 270 | return -EINVAL; |
| 271 | } |
| 272 | |
| 273 | retval = ab8500_rtc_set_calibration(dev, calibration); |
| 274 | |
| 275 | return retval ? retval : count; |
| 276 | } |
| 277 | |
| 278 | static ssize_t ab8500_sysfs_show_rtc_calibration(struct device *dev, |
| 279 | struct device_attribute *attr, char *buf) |
| 280 | { |
| 281 | int retval = 0; |
| 282 | int calibration = 0; |
| 283 | |
| 284 | retval = ab8500_rtc_get_calibration(dev, &calibration); |
| 285 | if (retval < 0) { |
| 286 | dev_err(dev, "Failed to read RTC calibration attribute\n"); |
| 287 | sprintf(buf, "0\n"); |
| 288 | return retval; |
| 289 | } |
| 290 | |
| 291 | return sprintf(buf, "%d\n", calibration); |
| 292 | } |
| 293 | |
| 294 | static DEVICE_ATTR(rtc_calibration, S_IRUGO | S_IWUSR, |
| 295 | ab8500_sysfs_show_rtc_calibration, |
| 296 | ab8500_sysfs_store_rtc_calibration); |
| 297 | |
Alexandre Belloni | b56295d | 2018-09-24 16:49:00 +0200 | [diff] [blame] | 298 | static struct attribute *ab8500_rtc_attrs[] = { |
| 299 | &dev_attr_rtc_calibration.attr, |
| 300 | NULL |
| 301 | }; |
Mark Godfrey | dda367a | 2012-01-10 15:10:42 -0800 | [diff] [blame] | 302 | |
Alexandre Belloni | b56295d | 2018-09-24 16:49:00 +0200 | [diff] [blame] | 303 | static const struct attribute_group ab8500_rtc_sysfs_files = { |
| 304 | .attrs = ab8500_rtc_attrs, |
| 305 | }; |
Mark Godfrey | dda367a | 2012-01-10 15:10:42 -0800 | [diff] [blame] | 306 | |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 307 | static irqreturn_t rtc_alarm_handler(int irq, void *data) |
| 308 | { |
| 309 | struct rtc_device *rtc = data; |
| 310 | unsigned long events = RTC_IRQF | RTC_AF; |
| 311 | |
| 312 | dev_dbg(&rtc->dev, "%s\n", __func__); |
| 313 | rtc_update_irq(rtc, 1, events); |
| 314 | |
| 315 | return IRQ_HANDLED; |
| 316 | } |
| 317 | |
| 318 | static const struct rtc_class_ops ab8500_rtc_ops = { |
| 319 | .read_time = ab8500_rtc_read_time, |
| 320 | .set_time = ab8500_rtc_set_time, |
| 321 | .read_alarm = ab8500_rtc_read_alarm, |
| 322 | .set_alarm = ab8500_rtc_set_alarm, |
| 323 | .alarm_irq_enable = ab8500_rtc_irq_enable, |
| 324 | }; |
| 325 | |
Krzysztof Kozlowski | 9a72f41 | 2015-05-02 00:44:35 +0900 | [diff] [blame] | 326 | static const struct platform_device_id ab85xx_rtc_ids[] = { |
Alexandre Torgue | 25d053c | 2013-07-03 15:07:45 -0700 | [diff] [blame] | 327 | { "ab8500-rtc", (kernel_ulong_t)&ab8500_rtc_ops, }, |
Fabio Estevam | 8a67e93 | 2015-09-04 08:58:05 -0300 | [diff] [blame] | 328 | { /* sentinel */ } |
Alexandre Torgue | 25d053c | 2013-07-03 15:07:45 -0700 | [diff] [blame] | 329 | }; |
Javier Martinez Canillas | 63074cc | 2015-08-27 12:34:32 +0200 | [diff] [blame] | 330 | MODULE_DEVICE_TABLE(platform, ab85xx_rtc_ids); |
Alexandre Torgue | 25d053c | 2013-07-03 15:07:45 -0700 | [diff] [blame] | 331 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 332 | static int ab8500_rtc_probe(struct platform_device *pdev) |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 333 | { |
Alexandre Torgue | 25d053c | 2013-07-03 15:07:45 -0700 | [diff] [blame] | 334 | const struct platform_device_id *platid = platform_get_device_id(pdev); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 335 | int err; |
| 336 | struct rtc_device *rtc; |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 337 | u8 rtc_ctrl; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 338 | int irq; |
| 339 | |
| 340 | irq = platform_get_irq_byname(pdev, "ALARM"); |
| 341 | if (irq < 0) |
| 342 | return irq; |
| 343 | |
| 344 | /* For RTC supply test */ |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 345 | err = abx500_mask_and_set_register_interruptible(&pdev->dev, AB8500_RTC, |
| 346 | AB8500_RTC_STAT_REG, RTC_STATUS_DATA, RTC_STATUS_DATA); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 347 | if (err < 0) |
| 348 | return err; |
| 349 | |
| 350 | /* Wait for reset by the PorRtc */ |
Linus Walleij | 012e52e | 2012-01-10 15:10:41 -0800 | [diff] [blame] | 351 | usleep_range(1000, 5000); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 352 | |
Mattias Wallin | 47c1697 | 2010-09-10 17:47:56 +0200 | [diff] [blame] | 353 | err = abx500_get_register_interruptible(&pdev->dev, AB8500_RTC, |
| 354 | AB8500_RTC_STAT_REG, &rtc_ctrl); |
| 355 | if (err < 0) |
| 356 | return err; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 357 | |
| 358 | /* Check if the RTC Supply fails */ |
| 359 | if (!(rtc_ctrl & RTC_STATUS_DATA)) { |
| 360 | dev_err(&pdev->dev, "RTC supply failure\n"); |
| 361 | return -ENODEV; |
| 362 | } |
| 363 | |
Andrew Lynn | b62581e | 2012-01-10 15:10:38 -0800 | [diff] [blame] | 364 | device_init_wakeup(&pdev->dev, true); |
| 365 | |
Alexandre Belloni | b56295d | 2018-09-24 16:49:00 +0200 | [diff] [blame] | 366 | rtc = devm_rtc_allocate_device(&pdev->dev); |
| 367 | if (IS_ERR(rtc)) |
| 368 | return PTR_ERR(rtc); |
| 369 | |
| 370 | rtc->ops = (struct rtc_class_ops *)platid->driver_data; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 371 | |
Jingoo Han | fa11f7e | 2013-04-29 16:20:34 -0700 | [diff] [blame] | 372 | err = devm_request_threaded_irq(&pdev->dev, irq, NULL, |
Sudeep Holla | 93a6f91 | 2015-09-21 16:46:58 +0100 | [diff] [blame] | 373 | rtc_alarm_handler, IRQF_ONESHOT, |
Jingoo Han | fa11f7e | 2013-04-29 16:20:34 -0700 | [diff] [blame] | 374 | "ab8500-rtc", rtc); |
| 375 | if (err < 0) |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 376 | return err; |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 377 | |
Sudeep Holla | 93a6f91 | 2015-09-21 16:46:58 +0100 | [diff] [blame] | 378 | dev_pm_set_wake_irq(&pdev->dev, irq); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 379 | platform_set_drvdata(pdev, rtc); |
| 380 | |
Alexandre Belloni | a5f8280 | 2021-11-07 23:54:51 +0100 | [diff] [blame] | 381 | set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->features); |
| 382 | clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features); |
Xunlei Pang | c594d67 | 2014-12-10 15:54:23 -0800 | [diff] [blame] | 383 | |
Alexandre Belloni | 38ab97a | 2018-09-24 16:49:01 +0200 | [diff] [blame] | 384 | rtc->range_max = (1ULL << 24) * 60 - 1; // 24-bit minutes + 59 secs |
| 385 | rtc->start_secs = RTC_TIMESTAMP_BEGIN_2000; |
| 386 | rtc->set_start_time = true; |
| 387 | |
Alexandre Belloni | b56295d | 2018-09-24 16:49:00 +0200 | [diff] [blame] | 388 | err = rtc_add_group(rtc, &ab8500_rtc_sysfs_files); |
| 389 | if (err) |
| 390 | return err; |
| 391 | |
Bartosz Golaszewski | fdcfd85 | 2020-11-09 17:34:08 +0100 | [diff] [blame] | 392 | return devm_rtc_register_device(rtc); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 395 | static int ab8500_rtc_remove(struct platform_device *pdev) |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 396 | { |
Sudeep Holla | 93a6f91 | 2015-09-21 16:46:58 +0100 | [diff] [blame] | 397 | dev_pm_clear_wake_irq(&pdev->dev); |
| 398 | device_init_wakeup(&pdev->dev, false); |
Mark Godfrey | dda367a | 2012-01-10 15:10:42 -0800 | [diff] [blame] | 399 | |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | static struct platform_driver ab8500_rtc_driver = { |
| 404 | .driver = { |
| 405 | .name = "ab8500-rtc", |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 406 | }, |
| 407 | .probe = ab8500_rtc_probe, |
Greg Kroah-Hartman | 5a167f4 | 2012-12-21 13:09:38 -0800 | [diff] [blame] | 408 | .remove = ab8500_rtc_remove, |
Alexandre Torgue | 25d053c | 2013-07-03 15:07:45 -0700 | [diff] [blame] | 409 | .id_table = ab85xx_rtc_ids, |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 410 | }; |
| 411 | |
Axel Lin | 0c4eae6 | 2012-01-10 15:10:48 -0800 | [diff] [blame] | 412 | module_platform_driver(ab8500_rtc_driver); |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 413 | |
Virupax Sadashivpetimath | 0af62f4 | 2010-05-26 14:42:14 -0700 | [diff] [blame] | 414 | MODULE_AUTHOR("Virupax Sadashivpetimath <virupax.sadashivpetimath@stericsson.com>"); |
| 415 | MODULE_DESCRIPTION("AB8500 RTC Driver"); |
| 416 | MODULE_LICENSE("GPL v2"); |