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Deepak Saxena8ae6e162006-06-25 05:47:38 -07001/*
2 * drivers/rtc/rtc-pl031.c
3 *
4 * Real Time Clock interface for ARM AMBA PrimeCell 031 RTC
5 *
6 * Author: Deepak Saxena <dsaxena@plexity.net>
7 *
8 * Copyright 2006 (c) MontaVista Software, Inc.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
Deepak Saxena8ae6e162006-06-25 05:47:38 -070015#include <linux/module.h>
16#include <linux/rtc.h>
17#include <linux/init.h>
Deepak Saxena8ae6e162006-06-25 05:47:38 -070018#include <linux/interrupt.h>
Deepak Saxena8ae6e162006-06-25 05:47:38 -070019#include <linux/amba/bus.h>
Russell King2dba8512008-04-20 12:08:04 +010020#include <linux/io.h>
Deepak Saxena8ae6e162006-06-25 05:47:38 -070021
22/*
23 * Register definitions
24 */
25#define RTC_DR 0x00 /* Data read register */
26#define RTC_MR 0x04 /* Match register */
27#define RTC_LR 0x08 /* Data load register */
28#define RTC_CR 0x0c /* Control register */
29#define RTC_IMSC 0x10 /* Interrupt mask and set register */
30#define RTC_RIS 0x14 /* Raw interrupt status register */
31#define RTC_MIS 0x18 /* Masked interrupt status register */
32#define RTC_ICR 0x1c /* Interrupt clear register */
33
34struct pl031_local {
35 struct rtc_device *rtc;
36 void __iomem *base;
37};
38
David Howells7d12e782006-10-05 14:55:46 +010039static irqreturn_t pl031_interrupt(int irq, void *dev_id)
Deepak Saxena8ae6e162006-06-25 05:47:38 -070040{
41 struct rtc_device *rtc = dev_id;
42
David Brownellab6a2d72007-05-08 00:33:30 -070043 rtc_update_irq(rtc, 1, RTC_AF);
Deepak Saxena8ae6e162006-06-25 05:47:38 -070044
45 return IRQ_HANDLED;
46}
47
Deepak Saxena8ae6e162006-06-25 05:47:38 -070048static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
49{
50 struct pl031_local *ldata = dev_get_drvdata(dev);
51
52 switch (cmd) {
53 case RTC_AIE_OFF:
54 __raw_writel(1, ldata->base + RTC_MIS);
55 return 0;
56 case RTC_AIE_ON:
57 __raw_writel(0, ldata->base + RTC_MIS);
58 return 0;
59 }
60
61 return -ENOIOCTLCMD;
62}
63
64static int pl031_read_time(struct device *dev, struct rtc_time *tm)
65{
66 struct pl031_local *ldata = dev_get_drvdata(dev);
67
68 rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm);
69
70 return 0;
71}
72
73static int pl031_set_time(struct device *dev, struct rtc_time *tm)
74{
75 unsigned long time;
76 struct pl031_local *ldata = dev_get_drvdata(dev);
77
78 rtc_tm_to_time(tm, &time);
79 __raw_writel(time, ldata->base + RTC_LR);
80
81 return 0;
82}
83
84static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
85{
86 struct pl031_local *ldata = dev_get_drvdata(dev);
87
88 rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time);
89 alarm->pending = __raw_readl(ldata->base + RTC_RIS);
90 alarm->enabled = __raw_readl(ldata->base + RTC_IMSC);
91
92 return 0;
93}
94
95static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
96{
97 struct pl031_local *ldata = dev_get_drvdata(dev);
98 unsigned long time;
99
100 rtc_tm_to_time(&alarm->time, &time);
101
102 __raw_writel(time, ldata->base + RTC_MR);
103 __raw_writel(!alarm->enabled, ldata->base + RTC_MIS);
104
105 return 0;
106}
107
David Brownellff8371a2006-09-30 23:28:17 -0700108static const struct rtc_class_ops pl031_ops = {
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700109 .ioctl = pl031_ioctl,
110 .read_time = pl031_read_time,
111 .set_time = pl031_set_time,
112 .read_alarm = pl031_read_alarm,
113 .set_alarm = pl031_set_alarm,
114};
115
116static int pl031_remove(struct amba_device *adev)
117{
118 struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
119
Russell King2dba8512008-04-20 12:08:04 +0100120 amba_set_drvdata(adev, NULL);
121 free_irq(adev->irq[0], ldata->rtc);
122 rtc_device_unregister(ldata->rtc);
123 iounmap(ldata->base);
124 kfree(ldata);
125 amba_release_regions(adev);
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700126
127 return 0;
128}
129
130static int pl031_probe(struct amba_device *adev, void *id)
131{
132 int ret;
133 struct pl031_local *ldata;
134
Russell King2dba8512008-04-20 12:08:04 +0100135 ret = amba_request_regions(adev, NULL);
136 if (ret)
137 goto err_req;
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700138
139 ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
140 if (!ldata) {
141 ret = -ENOMEM;
142 goto out;
143 }
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700144
145 ldata->base = ioremap(adev->res.start,
146 adev->res.end - adev->res.start + 1);
147 if (!ldata->base) {
148 ret = -ENOMEM;
149 goto out_no_remap;
150 }
151
Russell King2dba8512008-04-20 12:08:04 +0100152 amba_set_drvdata(adev, ldata);
153
Thomas Gleixnerdace1452006-07-01 19:29:38 -0700154 if (request_irq(adev->irq[0], pl031_interrupt, IRQF_DISABLED,
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700155 "rtc-pl031", ldata->rtc)) {
156 ret = -EIO;
157 goto out_no_irq;
158 }
159
160 ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
161 THIS_MODULE);
162 if (IS_ERR(ldata->rtc)) {
163 ret = PTR_ERR(ldata->rtc);
164 goto out_no_rtc;
165 }
166
167 return 0;
168
169out_no_rtc:
170 free_irq(adev->irq[0], ldata->rtc);
171out_no_irq:
172 iounmap(ldata->base);
Russell King2dba8512008-04-20 12:08:04 +0100173 amba_set_drvdata(adev, NULL);
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700174out_no_remap:
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700175 kfree(ldata);
176out:
Russell King2dba8512008-04-20 12:08:04 +0100177 amba_release_regions(adev);
178err_req:
Deepak Saxena8ae6e162006-06-25 05:47:38 -0700179 return ret;
180}
181
182static struct amba_id pl031_ids[] __initdata = {
183 {
184 .id = 0x00041031,
185 .mask = 0x000fffff, },
186 {0, 0},
187};
188
189static struct amba_driver pl031_driver = {
190 .drv = {
191 .name = "rtc-pl031",
192 },
193 .id_table = pl031_ids,
194 .probe = pl031_probe,
195 .remove = pl031_remove,
196};
197
198static int __init pl031_init(void)
199{
200 return amba_driver_register(&pl031_driver);
201}
202
203static void __exit pl031_exit(void)
204{
205 amba_driver_unregister(&pl031_driver);
206}
207
208module_init(pl031_init);
209module_exit(pl031_exit);
210
211MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net");
212MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
213MODULE_LICENSE("GPL");