Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Real Time Clock interface for StrongARM SA1x00 and XScale PXA2xx |
| 3 | * |
| 4 | * Copyright (c) 2000 Nils Faerber |
| 5 | * |
| 6 | * Based on rtc.c by Paul Gortmaker |
| 7 | * |
| 8 | * Original Driver by Nils Faerber <nils@kernelconcepts.de> |
| 9 | * |
| 10 | * Modifications from: |
| 11 | * CIH <cih@coventive.com> |
Nicolas Pitre | 2f82af0 | 2009-09-14 03:25:28 -0400 | [diff] [blame] | 12 | * Nicolas Pitre <nico@fluxnic.net> |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 13 | * Andrew Christian <andrew.christian@hp.com> |
| 14 | * |
| 15 | * Converted to the RTC subsystem and Driver Model |
| 16 | * by Richard Purdie <rpurdie@rpsys.net> |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or |
| 19 | * modify it under the terms of the GNU General Public License |
| 20 | * as published by the Free Software Foundation; either version |
| 21 | * 2 of the License, or (at your option) any later version. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/module.h> |
Haojian Zhuang | 8e8bbcb | 2012-02-23 23:36:37 +0800 | [diff] [blame] | 26 | #include <linux/clk.h> |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 27 | #include <linux/rtc.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/interrupt.h> |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 31 | #include <linux/slab.h> |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 32 | #include <linux/string.h> |
Haojian Zhuang | 8bec2e9 | 2012-03-05 19:26:42 +0800 | [diff] [blame] | 33 | #include <linux/of.h> |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 34 | #include <linux/pm.h> |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 35 | #include <linux/bitops.h> |
Rob Herring | 23019a7 | 2012-03-20 14:33:19 -0500 | [diff] [blame] | 36 | #include <linux/io.h> |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 37 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 38 | #include <mach/hardware.h> |
Rob Herring | 905cdc8 | 2012-02-23 14:27:58 +0100 | [diff] [blame] | 39 | #include <mach/irqs.h> |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 40 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 41 | #if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP) |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 42 | #include <mach/regs-rtc.h> |
| 43 | #endif |
| 44 | |
Marcelo Roberto Jimenez | a404ad1 | 2010-10-18 22:33:53 +0100 | [diff] [blame] | 45 | #define RTC_DEF_DIVIDER (32768 - 1) |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 46 | #define RTC_DEF_TRIM 0 |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 47 | #define RTC_FREQ 1024 |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 48 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 49 | struct sa1100_rtc { |
| 50 | spinlock_t lock; |
| 51 | int irq_1hz; |
| 52 | int irq_alarm; |
| 53 | struct rtc_device *rtc; |
Haojian Zhuang | 8e8bbcb | 2012-02-23 23:36:37 +0800 | [diff] [blame] | 54 | struct clk *clk; |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 55 | }; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 56 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 57 | static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id) |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 58 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 59 | struct sa1100_rtc *info = dev_get_drvdata(dev_id); |
| 60 | struct rtc_device *rtc = info->rtc; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 61 | unsigned int rtsr; |
| 62 | unsigned long events = 0; |
| 63 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 64 | spin_lock(&info->lock); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 65 | |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 66 | rtsr = RTSR; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 67 | /* clear interrupt sources */ |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 68 | RTSR = 0; |
Marcelo Roberto Jimenez | 7decaa5 | 2010-10-18 22:35:54 +0100 | [diff] [blame] | 69 | /* Fix for a nasty initialization problem the in SA11xx RTSR register. |
| 70 | * See also the comments in sa1100_rtc_probe(). */ |
| 71 | if (rtsr & (RTSR_ALE | RTSR_HZE)) { |
| 72 | /* This is the original code, before there was the if test |
| 73 | * above. This code does not clear interrupts that were not |
| 74 | * enabled. */ |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 75 | RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2); |
Marcelo Roberto Jimenez | 7decaa5 | 2010-10-18 22:35:54 +0100 | [diff] [blame] | 76 | } else { |
| 77 | /* For some reason, it is possible to enter this routine |
| 78 | * without interruptions enabled, it has been tested with |
| 79 | * several units (Bug in SA11xx chip?). |
| 80 | * |
| 81 | * This situation leads to an infinite "loop" of interrupt |
| 82 | * routine calling and as a result the processor seems to |
| 83 | * lock on its first call to open(). */ |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 84 | RTSR = RTSR_AL | RTSR_HZ; |
Marcelo Roberto Jimenez | 7decaa5 | 2010-10-18 22:35:54 +0100 | [diff] [blame] | 85 | } |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 86 | |
| 87 | /* clear alarm interrupt if it has occurred */ |
| 88 | if (rtsr & RTSR_AL) |
| 89 | rtsr &= ~RTSR_ALE; |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 90 | RTSR = rtsr & (RTSR_ALE | RTSR_HZE); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 91 | |
| 92 | /* update irq data & counter */ |
| 93 | if (rtsr & RTSR_AL) |
| 94 | events |= RTC_AF | RTC_IRQF; |
| 95 | if (rtsr & RTSR_HZ) |
| 96 | events |= RTC_UF | RTC_IRQF; |
| 97 | |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 98 | rtc_update_irq(rtc, 1, events); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 99 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 100 | spin_unlock(&info->lock); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 101 | |
| 102 | return IRQ_HANDLED; |
| 103 | } |
| 104 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 105 | static int sa1100_rtc_open(struct device *dev) |
| 106 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 107 | struct sa1100_rtc *info = dev_get_drvdata(dev); |
| 108 | struct rtc_device *rtc = info->rtc; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 109 | int ret; |
| 110 | |
Linus Torvalds | 3480059 | 2012-03-27 16:41:24 -0700 | [diff] [blame] | 111 | ret = request_irq(info->irq_1hz, sa1100_rtc_interrupt, 0, "rtc 1Hz", dev); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 112 | if (ret) { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 113 | dev_err(dev, "IRQ %d already in use.\n", info->irq_1hz); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 114 | goto fail_ui; |
| 115 | } |
Linus Torvalds | 3480059 | 2012-03-27 16:41:24 -0700 | [diff] [blame] | 116 | ret = request_irq(info->irq_alarm, sa1100_rtc_interrupt, 0, "rtc Alrm", dev); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 117 | if (ret) { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 118 | dev_err(dev, "IRQ %d already in use.\n", info->irq_alarm); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 119 | goto fail_ai; |
| 120 | } |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 121 | rtc->max_user_freq = RTC_FREQ; |
| 122 | rtc_irq_set_freq(rtc, NULL, RTC_FREQ); |
Marcelo Roberto Jimenez | d2ccb52 | 2010-12-16 21:31:32 +0100 | [diff] [blame] | 123 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 124 | return 0; |
| 125 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 126 | fail_ai: |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 127 | free_irq(info->irq_1hz, dev); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 128 | fail_ui: |
Haojian Zhuang | 8e8bbcb | 2012-02-23 23:36:37 +0800 | [diff] [blame] | 129 | clk_disable_unprepare(info->clk); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 130 | return ret; |
| 131 | } |
| 132 | |
| 133 | static void sa1100_rtc_release(struct device *dev) |
| 134 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 135 | struct sa1100_rtc *info = dev_get_drvdata(dev); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 136 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 137 | spin_lock_irq(&info->lock); |
| 138 | RTSR = 0; |
| 139 | spin_unlock_irq(&info->lock); |
| 140 | |
| 141 | free_irq(info->irq_alarm, dev); |
| 142 | free_irq(info->irq_1hz, dev); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 143 | } |
| 144 | |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 145 | static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
| 146 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 147 | struct sa1100_rtc *info = dev_get_drvdata(dev); |
| 148 | |
| 149 | spin_lock_irq(&info->lock); |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 150 | if (enabled) |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 151 | RTSR |= RTSR_ALE; |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 152 | else |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 153 | RTSR &= ~RTSR_ALE; |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 154 | spin_unlock_irq(&info->lock); |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 155 | return 0; |
| 156 | } |
| 157 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 158 | static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm) |
| 159 | { |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 160 | rtc_time_to_tm(RCNR, tm); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm) |
| 165 | { |
| 166 | unsigned long time; |
| 167 | int ret; |
| 168 | |
| 169 | ret = rtc_tm_to_time(tm, &time); |
| 170 | if (ret == 0) |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 171 | RCNR = time; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 176 | { |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 177 | u32 rtsr; |
David Brownell | 32b49da | 2007-02-20 13:58:13 -0800 | [diff] [blame] | 178 | |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 179 | rtsr = RTSR; |
David Brownell | 32b49da | 2007-02-20 13:58:13 -0800 | [diff] [blame] | 180 | alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0; |
| 181 | alrm->pending = (rtsr & RTSR_AL) ? 1 : 0; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) |
| 186 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 187 | struct sa1100_rtc *info = dev_get_drvdata(dev); |
Haojian Zhuang | 1d8c38c | 2012-02-20 19:49:30 +0800 | [diff] [blame] | 188 | unsigned long time; |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 189 | int ret; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 190 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 191 | spin_lock_irq(&info->lock); |
Haojian Zhuang | 1d8c38c | 2012-02-20 19:49:30 +0800 | [diff] [blame] | 192 | ret = rtc_tm_to_time(&alrm->time, &time); |
| 193 | if (ret != 0) |
| 194 | goto out; |
| 195 | RTSR = RTSR & (RTSR_HZE|RTSR_ALE|RTSR_AL); |
| 196 | RTAR = time; |
| 197 | if (alrm->enabled) |
| 198 | RTSR |= RTSR_ALE; |
| 199 | else |
| 200 | RTSR &= ~RTSR_ALE; |
| 201 | out: |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 202 | spin_unlock_irq(&info->lock); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 203 | |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 204 | return ret; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq) |
| 208 | { |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 209 | seq_printf(seq, "trim/divider\t\t: 0x%08x\n", (u32) RTTR); |
| 210 | seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", (u32)RTSR); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
David Brownell | ff8371a | 2006-09-30 23:28:17 -0700 | [diff] [blame] | 215 | static const struct rtc_class_ops sa1100_rtc_ops = { |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 216 | .open = sa1100_rtc_open, |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 217 | .release = sa1100_rtc_release, |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 218 | .read_time = sa1100_rtc_read_time, |
| 219 | .set_time = sa1100_rtc_set_time, |
| 220 | .read_alarm = sa1100_rtc_read_alarm, |
| 221 | .set_alarm = sa1100_rtc_set_alarm, |
| 222 | .proc = sa1100_rtc_proc, |
John Stultz | 16380c1 | 2011-02-02 17:02:41 -0800 | [diff] [blame] | 223 | .alarm_irq_enable = sa1100_rtc_alarm_irq_enable, |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 224 | }; |
| 225 | |
| 226 | static int sa1100_rtc_probe(struct platform_device *pdev) |
| 227 | { |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 228 | struct rtc_device *rtc; |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 229 | struct sa1100_rtc *info; |
| 230 | int irq_1hz, irq_alarm, ret = 0; |
| 231 | |
| 232 | irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz"); |
| 233 | irq_alarm = platform_get_irq_byname(pdev, "rtc alarm"); |
| 234 | if (irq_1hz < 0 || irq_alarm < 0) |
| 235 | return -ENODEV; |
| 236 | |
Jingoo Han | 55d735e | 2013-04-29 16:20:54 -0700 | [diff] [blame] | 237 | info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL); |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 238 | if (!info) |
| 239 | return -ENOMEM; |
Jingoo Han | 55d735e | 2013-04-29 16:20:54 -0700 | [diff] [blame] | 240 | info->clk = devm_clk_get(&pdev->dev, NULL); |
Haojian Zhuang | 8e8bbcb | 2012-02-23 23:36:37 +0800 | [diff] [blame] | 241 | if (IS_ERR(info->clk)) { |
| 242 | dev_err(&pdev->dev, "failed to find rtc clock source\n"); |
Jingoo Han | 55d735e | 2013-04-29 16:20:54 -0700 | [diff] [blame] | 243 | return PTR_ERR(info->clk); |
Haojian Zhuang | 8e8bbcb | 2012-02-23 23:36:37 +0800 | [diff] [blame] | 244 | } |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 245 | info->irq_1hz = irq_1hz; |
| 246 | info->irq_alarm = irq_alarm; |
| 247 | spin_lock_init(&info->lock); |
| 248 | platform_set_drvdata(pdev, info); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 249 | |
Chao Xie | 0cc0c38 | 2013-02-21 16:45:17 -0800 | [diff] [blame] | 250 | ret = clk_prepare_enable(info->clk); |
| 251 | if (ret) |
Jingoo Han | 66600bb | 2013-07-03 15:06:35 -0700 | [diff] [blame] | 252 | return ret; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 253 | /* |
| 254 | * According to the manual we should be able to let RTTR be zero |
| 255 | * and then a default diviser for a 32.768KHz clock is used. |
| 256 | * Apparently this doesn't work, at least for my SA1110 rev 5. |
| 257 | * If the clock divider is uninitialized then reset it to the |
| 258 | * default value to get the 1Hz clock. |
| 259 | */ |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 260 | if (RTTR == 0) { |
| 261 | RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16); |
| 262 | dev_warn(&pdev->dev, "warning: " |
| 263 | "initializing default clock divider/trim value\n"); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 264 | /* The current RTC value probably doesn't make sense either */ |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 265 | RCNR = 0; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 266 | } |
| 267 | |
Uli Luckas | e5a2c9c | 2008-06-18 09:54:03 +0100 | [diff] [blame] | 268 | device_init_wakeup(&pdev->dev, 1); |
| 269 | |
Jingoo Han | 55d735e | 2013-04-29 16:20:54 -0700 | [diff] [blame] | 270 | rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &sa1100_rtc_ops, |
| 271 | THIS_MODULE); |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 272 | |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 273 | if (IS_ERR(rtc)) { |
| 274 | ret = PTR_ERR(rtc); |
| 275 | goto err_dev; |
| 276 | } |
| 277 | info->rtc = rtc; |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 278 | |
Marcelo Roberto Jimenez | 7decaa5 | 2010-10-18 22:35:54 +0100 | [diff] [blame] | 279 | /* Fix for a nasty initialization problem the in SA11xx RTSR register. |
| 280 | * See also the comments in sa1100_rtc_interrupt(). |
| 281 | * |
| 282 | * Sometimes bit 1 of the RTSR (RTSR_HZ) will wake up 1, which means an |
| 283 | * interrupt pending, even though interrupts were never enabled. |
| 284 | * In this case, this bit it must be reset before enabling |
| 285 | * interruptions to avoid a nonexistent interrupt to occur. |
| 286 | * |
| 287 | * In principle, the same problem would apply to bit 0, although it has |
| 288 | * never been observed to happen. |
| 289 | * |
| 290 | * This issue is addressed both here and in sa1100_rtc_interrupt(). |
| 291 | * If the issue is not addressed here, in the times when the processor |
| 292 | * wakes up with the bit set there will be one spurious interrupt. |
| 293 | * |
| 294 | * The issue is also dealt with in sa1100_rtc_interrupt() to be on the |
| 295 | * safe side, once the condition that lead to this strange |
| 296 | * initialization is unknown and could in principle happen during |
| 297 | * normal processing. |
| 298 | * |
| 299 | * Notice that clearing bit 1 and 0 is accomplished by writting ONES to |
| 300 | * the corresponding bits in RTSR. */ |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 301 | RTSR = RTSR_AL | RTSR_HZ; |
Marcelo Roberto Jimenez | 7decaa5 | 2010-10-18 22:35:54 +0100 | [diff] [blame] | 302 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 303 | return 0; |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 304 | err_dev: |
Chao Xie | 0cc0c38 | 2013-02-21 16:45:17 -0800 | [diff] [blame] | 305 | clk_disable_unprepare(info->clk); |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 306 | return ret; |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | static int sa1100_rtc_remove(struct platform_device *pdev) |
| 310 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 311 | struct sa1100_rtc *info = platform_get_drvdata(pdev); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 312 | |
Jingoo Han | 66600bb | 2013-07-03 15:06:35 -0700 | [diff] [blame] | 313 | if (info) |
Chao Xie | 0cc0c38 | 2013-02-21 16:45:17 -0800 | [diff] [blame] | 314 | clk_disable_unprepare(info->clk); |
Russell King | a0164a5 | 2012-01-19 11:55:21 +0000 | [diff] [blame] | 315 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 316 | return 0; |
| 317 | } |
| 318 | |
Jingoo Han | aaa92fa | 2013-04-29 16:19:59 -0700 | [diff] [blame] | 319 | #ifdef CONFIG_PM_SLEEP |
Haojian Zhuang | 5d027cd | 2009-07-21 14:31:09 +0800 | [diff] [blame] | 320 | static int sa1100_rtc_suspend(struct device *dev) |
Russell King | 6bc54e6 | 2007-11-12 22:49:58 +0000 | [diff] [blame] | 321 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 322 | struct sa1100_rtc *info = dev_get_drvdata(dev); |
Haojian Zhuang | 5d027cd | 2009-07-21 14:31:09 +0800 | [diff] [blame] | 323 | if (device_may_wakeup(dev)) |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 324 | enable_irq_wake(info->irq_alarm); |
Russell King | 6bc54e6 | 2007-11-12 22:49:58 +0000 | [diff] [blame] | 325 | return 0; |
| 326 | } |
| 327 | |
Haojian Zhuang | 5d027cd | 2009-07-21 14:31:09 +0800 | [diff] [blame] | 328 | static int sa1100_rtc_resume(struct device *dev) |
Russell King | 6bc54e6 | 2007-11-12 22:49:58 +0000 | [diff] [blame] | 329 | { |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 330 | struct sa1100_rtc *info = dev_get_drvdata(dev); |
Haojian Zhuang | 5d027cd | 2009-07-21 14:31:09 +0800 | [diff] [blame] | 331 | if (device_may_wakeup(dev)) |
Haojian Zhuang | 3888c09 | 2012-02-21 11:51:13 +0800 | [diff] [blame] | 332 | disable_irq_wake(info->irq_alarm); |
Russell King | 6bc54e6 | 2007-11-12 22:49:58 +0000 | [diff] [blame] | 333 | return 0; |
| 334 | } |
Russell King | 6bc54e6 | 2007-11-12 22:49:58 +0000 | [diff] [blame] | 335 | #endif |
| 336 | |
Jingoo Han | aaa92fa | 2013-04-29 16:19:59 -0700 | [diff] [blame] | 337 | static SIMPLE_DEV_PM_OPS(sa1100_rtc_pm_ops, sa1100_rtc_suspend, |
| 338 | sa1100_rtc_resume); |
| 339 | |
Sachin Kamat | c8a6046 | 2013-02-21 16:44:28 -0800 | [diff] [blame] | 340 | #ifdef CONFIG_OF |
Jingoo Han | dee21a6 | 2014-06-06 14:36:13 -0700 | [diff] [blame] | 341 | static const struct of_device_id sa1100_rtc_dt_ids[] = { |
Haojian Zhuang | 8bec2e9 | 2012-03-05 19:26:42 +0800 | [diff] [blame] | 342 | { .compatible = "mrvl,sa1100-rtc", }, |
| 343 | { .compatible = "mrvl,mmp-rtc", }, |
| 344 | {} |
| 345 | }; |
| 346 | MODULE_DEVICE_TABLE(of, sa1100_rtc_dt_ids); |
Sachin Kamat | c8a6046 | 2013-02-21 16:44:28 -0800 | [diff] [blame] | 347 | #endif |
Haojian Zhuang | 8bec2e9 | 2012-03-05 19:26:42 +0800 | [diff] [blame] | 348 | |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 349 | static struct platform_driver sa1100_rtc_driver = { |
| 350 | .probe = sa1100_rtc_probe, |
| 351 | .remove = sa1100_rtc_remove, |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 352 | .driver = { |
Haojian Zhuang | 5d027cd | 2009-07-21 14:31:09 +0800 | [diff] [blame] | 353 | .name = "sa1100-rtc", |
Haojian Zhuang | 5d027cd | 2009-07-21 14:31:09 +0800 | [diff] [blame] | 354 | .pm = &sa1100_rtc_pm_ops, |
Sachin Kamat | c8a6046 | 2013-02-21 16:44:28 -0800 | [diff] [blame] | 355 | .of_match_table = of_match_ptr(sa1100_rtc_dt_ids), |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 356 | }, |
| 357 | }; |
| 358 | |
Axel Lin | 0c4eae6 | 2012-01-10 15:10:48 -0800 | [diff] [blame] | 359 | module_platform_driver(sa1100_rtc_driver); |
Richard Purdie | e842f1c | 2006-03-27 01:16:46 -0800 | [diff] [blame] | 360 | |
| 361 | MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>"); |
| 362 | MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)"); |
| 363 | MODULE_LICENSE("GPL"); |
Kay Sievers | ad28a07 | 2008-04-10 21:29:25 -0700 | [diff] [blame] | 364 | MODULE_ALIAS("platform:sa1100-rtc"); |