Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Real Time Clock interface for Linux on Atmel AT91RM9200 |
| 3 | * |
| 4 | * Copyright (C) 2002 Rick Bronson |
| 5 | * |
| 6 | * Converted to RTC class model by Andrew Victor |
| 7 | * |
| 8 | * Ported to Linux 2.6 by Steven Scholz |
| 9 | * Based on s3c2410-rtc.c Simtec Electronics |
| 10 | * |
| 11 | * Based on sa1100-rtc.c by Nils Faerber |
| 12 | * Based on rtc.c by Paul Gortmaker |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or |
| 15 | * modify it under the terms of the GNU General Public License |
| 16 | * as published by the Free Software Foundation; either version |
| 17 | * 2 of the License, or (at your option) any later version. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/time.h> |
| 25 | #include <linux/rtc.h> |
| 26 | #include <linux/bcd.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/ioctl.h> |
| 29 | #include <linux/completion.h> |
Arnd Bergmann | 14070ad | 2012-07-04 07:45:16 +0000 | [diff] [blame] | 30 | #include <linux/io.h> |
Joachim Eastwood | 7c1b68d | 2013-04-29 16:20:15 -0700 | [diff] [blame] | 31 | #include <linux/of.h> |
| 32 | #include <linux/of_device.h> |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 33 | |
| 34 | #include <asm/uaccess.h> |
Andrew Victor | fb0d4ec | 2008-10-15 22:03:08 -0700 | [diff] [blame] | 35 | |
Jean-Christophe PLAGNIOL-VILLARD | 75984df | 2012-10-30 08:03:39 +0800 | [diff] [blame] | 36 | #include "rtc-at91rm9200.h" |
David Brownell | d73e3cd | 2007-01-05 16:36:25 -0800 | [diff] [blame] | 37 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 38 | #define at91_rtc_read(field) \ |
| 39 | __raw_readl(at91_rtc_regs + field) |
| 40 | #define at91_rtc_write(field, val) \ |
| 41 | __raw_writel((val), at91_rtc_regs + field) |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 42 | |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 43 | #define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */ |
| 44 | |
| 45 | static DECLARE_COMPLETION(at91_rtc_updated); |
| 46 | static unsigned int at91_alarm_year = AT91_RTC_EPOCH; |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 47 | static void __iomem *at91_rtc_regs; |
| 48 | static int irq; |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 49 | |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 50 | /* |
| 51 | * Decode time/date into rtc_time structure |
| 52 | */ |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 53 | static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg, |
| 54 | struct rtc_time *tm) |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 55 | { |
| 56 | unsigned int time, date; |
| 57 | |
| 58 | /* must read twice in case it changes */ |
| 59 | do { |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 60 | time = at91_rtc_read(timereg); |
| 61 | date = at91_rtc_read(calreg); |
| 62 | } while ((time != at91_rtc_read(timereg)) || |
| 63 | (date != at91_rtc_read(calreg))); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 64 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 65 | tm->tm_sec = bcd2bin((time & AT91_RTC_SEC) >> 0); |
| 66 | tm->tm_min = bcd2bin((time & AT91_RTC_MIN) >> 8); |
| 67 | tm->tm_hour = bcd2bin((time & AT91_RTC_HOUR) >> 16); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 68 | |
| 69 | /* |
| 70 | * The Calendar Alarm register does not have a field for |
| 71 | * the year - so these will return an invalid value. When an |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 72 | * alarm is set, at91_alarm_year will store the current year. |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 73 | */ |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 74 | tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */ |
| 75 | tm->tm_year += bcd2bin((date & AT91_RTC_YEAR) >> 8); /* year */ |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 76 | |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 77 | tm->tm_wday = bcd2bin((date & AT91_RTC_DAY) >> 21) - 1; /* day of the week [0-6], Sunday=0 */ |
| 78 | tm->tm_mon = bcd2bin((date & AT91_RTC_MONTH) >> 16) - 1; |
| 79 | tm->tm_mday = bcd2bin((date & AT91_RTC_DATE) >> 24); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Read current time and date in RTC |
| 84 | */ |
| 85 | static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm) |
| 86 | { |
| 87 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm); |
| 88 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); |
| 89 | tm->tm_year = tm->tm_year - 1900; |
| 90 | |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 91 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 92 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
| 93 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * Set current time and date in RTC |
| 100 | */ |
| 101 | static int at91_rtc_settime(struct device *dev, struct rtc_time *tm) |
| 102 | { |
| 103 | unsigned long cr; |
| 104 | |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 105 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 106 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
| 107 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 108 | |
| 109 | /* Stop Time/Calendar from counting */ |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 110 | cr = at91_rtc_read(AT91_RTC_CR); |
| 111 | at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 112 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 113 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD); |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 114 | wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */ |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 115 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 116 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 117 | at91_rtc_write(AT91_RTC_TIMR, |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 118 | bin2bcd(tm->tm_sec) << 0 |
| 119 | | bin2bcd(tm->tm_min) << 8 |
| 120 | | bin2bcd(tm->tm_hour) << 16); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 121 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 122 | at91_rtc_write(AT91_RTC_CALR, |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 123 | bin2bcd((tm->tm_year + 1900) / 100) /* century */ |
| 124 | | bin2bcd(tm->tm_year % 100) << 8 /* year */ |
| 125 | | bin2bcd(tm->tm_mon + 1) << 16 /* tm_mon starts at zero */ |
| 126 | | bin2bcd(tm->tm_wday + 1) << 21 /* day of the week [0-6], Sunday=0 */ |
| 127 | | bin2bcd(tm->tm_mday) << 24); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 128 | |
| 129 | /* Restart Time/Calendar */ |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 130 | cr = at91_rtc_read(AT91_RTC_CR); |
| 131 | at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM)); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Read alarm time and date in RTC |
| 138 | */ |
| 139 | static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 140 | { |
| 141 | struct rtc_time *tm = &alrm->time; |
| 142 | |
| 143 | at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm); |
| 144 | tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); |
| 145 | tm->tm_year = at91_alarm_year - 1900; |
| 146 | |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 147 | alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM) |
David Brownell | a2db8df | 2006-12-13 00:35:08 -0800 | [diff] [blame] | 148 | ? 1 : 0; |
| 149 | |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 150 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 151 | 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, |
| 152 | tm->tm_hour, tm->tm_min, tm->tm_sec); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 153 | |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Set alarm time and date in RTC |
| 159 | */ |
| 160 | static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 161 | { |
| 162 | struct rtc_time tm; |
| 163 | |
| 164 | at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, &tm); |
| 165 | |
| 166 | at91_alarm_year = tm.tm_year; |
| 167 | |
| 168 | tm.tm_hour = alrm->time.tm_hour; |
| 169 | tm.tm_min = alrm->time.tm_min; |
| 170 | tm.tm_sec = alrm->time.tm_sec; |
| 171 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 172 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
| 173 | at91_rtc_write(AT91_RTC_TIMALR, |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 174 | bin2bcd(tm.tm_sec) << 0 |
| 175 | | bin2bcd(tm.tm_min) << 8 |
| 176 | | bin2bcd(tm.tm_hour) << 16 |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 177 | | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN); |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 178 | at91_rtc_write(AT91_RTC_CALALR, |
Adrian Bunk | fe20ba7 | 2008-10-18 20:28:41 -0700 | [diff] [blame] | 179 | bin2bcd(tm.tm_mon + 1) << 16 /* tm_mon starts at zero */ |
| 180 | | bin2bcd(tm.tm_mday) << 24 |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 181 | | AT91_RTC_DATEEN | AT91_RTC_MTHEN); |
| 182 | |
David Brownell | 449321b | 2008-07-23 21:30:46 -0700 | [diff] [blame] | 183 | if (alrm->enabled) { |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 184 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
| 185 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); |
David Brownell | 449321b | 2008-07-23 21:30:46 -0700 | [diff] [blame] | 186 | } |
David Brownell | 5d4675a | 2007-02-20 13:58:14 -0800 | [diff] [blame] | 187 | |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 188 | dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__, |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 189 | at91_alarm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, |
| 190 | tm.tm_min, tm.tm_sec); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 195 | static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
| 196 | { |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 197 | dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled); |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 198 | |
| 199 | if (enabled) { |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 200 | at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM); |
| 201 | at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM); |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 202 | } else |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 203 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM); |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 204 | |
| 205 | return 0; |
| 206 | } |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 207 | /* |
| 208 | * Provide additional RTC information in /proc/driver/rtc |
| 209 | */ |
| 210 | static int at91_rtc_proc(struct device *dev, struct seq_file *seq) |
| 211 | { |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 212 | unsigned long imr = at91_rtc_read(AT91_RTC_IMR); |
| 213 | |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 214 | seq_printf(seq, "update_IRQ\t: %s\n", |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 215 | (imr & AT91_RTC_ACKUPD) ? "yes" : "no"); |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 216 | seq_printf(seq, "periodic_IRQ\t: %s\n", |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 217 | (imr & AT91_RTC_SECEV) ? "yes" : "no"); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * IRQ handler for the RTC |
| 224 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 225 | static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id) |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 226 | { |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 227 | struct platform_device *pdev = dev_id; |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 228 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
| 229 | unsigned int rtsr; |
| 230 | unsigned long events = 0; |
| 231 | |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 232 | rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 233 | if (rtsr) { /* this interrupt is shared! Is it ours? */ |
| 234 | if (rtsr & AT91_RTC_ALARM) |
| 235 | events |= (RTC_AF | RTC_IRQF); |
| 236 | if (rtsr & AT91_RTC_SECEV) |
| 237 | events |= (RTC_UF | RTC_IRQF); |
| 238 | if (rtsr & AT91_RTC_ACKUPD) |
| 239 | complete(&at91_rtc_updated); |
| 240 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 241 | at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */ |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 242 | |
David Brownell | ab6a2d7 | 2007-05-08 00:33:30 -0700 | [diff] [blame] | 243 | rtc_update_irq(rtc, 1, events); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 244 | |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 245 | dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n", __func__, |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 246 | events >> 8, events & 0x000000FF); |
| 247 | |
| 248 | return IRQ_HANDLED; |
| 249 | } |
| 250 | return IRQ_NONE; /* not handled */ |
| 251 | } |
| 252 | |
David Brownell | ff8371a | 2006-09-30 23:28:17 -0700 | [diff] [blame] | 253 | static const struct rtc_class_ops at91_rtc_ops = { |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 254 | .read_time = at91_rtc_readtime, |
| 255 | .set_time = at91_rtc_settime, |
| 256 | .read_alarm = at91_rtc_readalarm, |
| 257 | .set_alarm = at91_rtc_setalarm, |
| 258 | .proc = at91_rtc_proc, |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 259 | .alarm_irq_enable = at91_rtc_alarm_irq_enable, |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 260 | }; |
| 261 | |
| 262 | /* |
| 263 | * Initialize and install RTC driver |
| 264 | */ |
| 265 | static int __init at91_rtc_probe(struct platform_device *pdev) |
| 266 | { |
| 267 | struct rtc_device *rtc; |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 268 | struct resource *regs; |
| 269 | int ret = 0; |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 270 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 271 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 272 | if (!regs) { |
| 273 | dev_err(&pdev->dev, "no mmio resource defined\n"); |
| 274 | return -ENXIO; |
| 275 | } |
| 276 | |
| 277 | irq = platform_get_irq(pdev, 0); |
| 278 | if (irq < 0) { |
| 279 | dev_err(&pdev->dev, "no irq resource defined\n"); |
| 280 | return -ENXIO; |
| 281 | } |
| 282 | |
| 283 | at91_rtc_regs = ioremap(regs->start, resource_size(regs)); |
| 284 | if (!at91_rtc_regs) { |
| 285 | dev_err(&pdev->dev, "failed to map registers, aborting.\n"); |
| 286 | return -ENOMEM; |
| 287 | } |
| 288 | |
| 289 | at91_rtc_write(AT91_RTC_CR, 0); |
| 290 | at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */ |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 291 | |
| 292 | /* Disable all interrupts */ |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 293 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 294 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
| 295 | AT91_RTC_CALEV); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 296 | |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 297 | ret = request_irq(irq, at91_rtc_interrupt, |
David Brownell | dac94d9 | 2009-09-22 16:46:31 -0700 | [diff] [blame] | 298 | IRQF_SHARED, |
David Brownell | d728b1e | 2006-11-25 11:09:28 -0800 | [diff] [blame] | 299 | "at91_rtc", pdev); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 300 | if (ret) { |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 301 | dev_err(&pdev->dev, "IRQ %d already in use.\n", irq); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 302 | return ret; |
| 303 | } |
| 304 | |
David Brownell | 5d4675a | 2007-02-20 13:58:14 -0800 | [diff] [blame] | 305 | /* cpu init code should really have flagged this device as |
| 306 | * being wake-capable; if it didn't, do that here. |
| 307 | */ |
| 308 | if (!device_can_wakeup(&pdev->dev)) |
| 309 | device_init_wakeup(&pdev->dev, 1); |
| 310 | |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 311 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
| 312 | &at91_rtc_ops, THIS_MODULE); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 313 | if (IS_ERR(rtc)) { |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 314 | free_irq(irq, pdev); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 315 | return PTR_ERR(rtc); |
| 316 | } |
| 317 | platform_set_drvdata(pdev, rtc); |
| 318 | |
Jingoo Han | 6588208 | 2013-02-21 16:45:28 -0800 | [diff] [blame] | 319 | dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n"); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Disable and remove the RTC driver |
| 325 | */ |
David Brownell | 5d4675a | 2007-02-20 13:58:14 -0800 | [diff] [blame] | 326 | static int __exit at91_rtc_remove(struct platform_device *pdev) |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 327 | { |
| 328 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
| 329 | |
| 330 | /* Disable all interrupts */ |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 331 | at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM | |
Andrew Morton | e7a8bb1 | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 332 | AT91_RTC_SECEV | AT91_RTC_TIMEV | |
| 333 | AT91_RTC_CALEV); |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 334 | free_irq(irq, pdev); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 335 | |
| 336 | rtc_device_unregister(rtc); |
| 337 | platform_set_drvdata(pdev, NULL); |
| 338 | |
| 339 | return 0; |
| 340 | } |
| 341 | |
Jingoo Han | 6975a9c | 2013-04-29 16:19:56 -0700 | [diff] [blame] | 342 | #ifdef CONFIG_PM_SLEEP |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 343 | |
| 344 | /* AT91RM9200 RTC Power management control */ |
| 345 | |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 346 | static u32 at91_rtc_imr; |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 347 | |
David Brownell | dac94d9 | 2009-09-22 16:46:31 -0700 | [diff] [blame] | 348 | static int at91_rtc_suspend(struct device *dev) |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 349 | { |
David Brownell | 90b4d64 | 2006-09-30 23:28:17 -0700 | [diff] [blame] | 350 | /* this IRQ is shared with DBGU and other hardware which isn't |
| 351 | * necessarily doing PM like we are... |
| 352 | */ |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 353 | at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR) |
| 354 | & (AT91_RTC_ALARM|AT91_RTC_SECEV); |
| 355 | if (at91_rtc_imr) { |
| 356 | if (device_may_wakeup(dev)) |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 357 | enable_irq_wake(irq); |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 358 | else |
| 359 | at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr); |
| 360 | } |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 361 | return 0; |
| 362 | } |
| 363 | |
David Brownell | dac94d9 | 2009-09-22 16:46:31 -0700 | [diff] [blame] | 364 | static int at91_rtc_resume(struct device *dev) |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 365 | { |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 366 | if (at91_rtc_imr) { |
| 367 | if (device_may_wakeup(dev)) |
Jean-Christophe PLAGNIOL-VILLARD | d28bdfc | 2011-11-14 14:24:53 +0800 | [diff] [blame] | 368 | disable_irq_wake(irq); |
Johan Hovold | e24b0bf | 2013-04-05 18:16:34 +0200 | [diff] [blame] | 369 | else |
| 370 | at91_rtc_write(AT91_RTC_IER, at91_rtc_imr); |
David Brownell | 90b4d64 | 2006-09-30 23:28:17 -0700 | [diff] [blame] | 371 | } |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 372 | return 0; |
| 373 | } |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 374 | #endif |
| 375 | |
Jingoo Han | 6975a9c | 2013-04-29 16:19:56 -0700 | [diff] [blame] | 376 | static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume); |
| 377 | |
Joachim Eastwood | 7c1b68d | 2013-04-29 16:20:15 -0700 | [diff] [blame] | 378 | static const struct of_device_id at91_rtc_dt_ids[] = { |
| 379 | { .compatible = "atmel,at91rm9200-rtc" }, |
| 380 | { /* sentinel */ } |
| 381 | }; |
| 382 | MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids); |
| 383 | |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 384 | static struct platform_driver at91_rtc_driver = { |
David Brownell | 5d4675a | 2007-02-20 13:58:14 -0800 | [diff] [blame] | 385 | .remove = __exit_p(at91_rtc_remove), |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 386 | .driver = { |
| 387 | .name = "at91_rtc", |
| 388 | .owner = THIS_MODULE, |
Jingoo Han | 6975a9c | 2013-04-29 16:19:56 -0700 | [diff] [blame] | 389 | .pm = &at91_rtc_pm_ops, |
Joachim Eastwood | 7c1b68d | 2013-04-29 16:20:15 -0700 | [diff] [blame] | 390 | .of_match_table = of_match_ptr(at91_rtc_dt_ids), |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 391 | }, |
| 392 | }; |
| 393 | |
Jingoo Han | ac36960 | 2013-04-29 16:18:36 -0700 | [diff] [blame] | 394 | module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe); |
Andrew Victor | 788b1fc | 2006-06-25 05:48:27 -0700 | [diff] [blame] | 395 | |
| 396 | MODULE_AUTHOR("Rick Bronson"); |
| 397 | MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200"); |
| 398 | MODULE_LICENSE("GPL"); |
Kay Sievers | ad28a07 | 2008-04-10 21:29:25 -0700 | [diff] [blame] | 399 | MODULE_ALIAS("platform:at91_rtc"); |