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authorDeepak Saxena <dsaxena@plexity.net>2006-06-25 08:47:38 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 13:01:05 -0400
commit8ae6e163c1b637e1cb125613726ffbd31ca44fdf (patch)
tree28a0f2be841d9b8ff0ab86a3706acce41ac0b6f9 /drivers/rtc
parentdcd96379613a3cbe87c30e1c20122ecdcdf3a4b8 (diff)
[PATCH] Add driver for ARM AMBA PL031 RTC
Add a driver for the ARM PL031 RTC found on some ARM SOCs. The driver is fairly trivial as the RTC only provides a read/write and alarm capability. [akpm@osdl.org: compile fix] Signed-off-by: Deepak <dsaxena@plexity.net> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/Kconfig10
-rw-r--r--drivers/rtc/Makefile1
-rw-r--r--drivers/rtc/rtc-pl031.c233
3 files changed, 244 insertions, 0 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 65d090dbef46..875ff5e5792a 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -157,6 +157,16 @@ config RTC_DRV_VR41XX
157 To compile this driver as a module, choose M here: the 157 To compile this driver as a module, choose M here: the
158 module will be called rtc-vr41xx. 158 module will be called rtc-vr41xx.
159 159
160config RTC_DRV_PL031
161 tristate "ARM AMBA PL031 RTC"
162 depends on RTC_CLASS && ARM_AMBA
163 help
164 If you say Y here you will get access to ARM AMBA
165 PrimeCell PL031 UART found on certain ARM SOCs.
166
167 To compile this driver as a module, choose M here: the
168 module will be called rtc-pl031.
169
160config RTC_DRV_TEST 170config RTC_DRV_TEST
161 tristate "Test driver/device" 171 tristate "Test driver/device"
162 depends on RTC_CLASS 172 depends on RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index a9ca0f171686..1b3f32ecec80 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -20,3 +20,4 @@ obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
20obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o 20obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
21obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o 21obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o
22obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o 22obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o
23obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
new file mode 100644
index 000000000000..ee538632660b
--- /dev/null
+++ b/drivers/rtc/rtc-pl031.c
@@ -0,0 +1,233 @@
1/*
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 */
15
16#include <linux/platform_device.h>
17#include <linux/module.h>
18#include <linux/rtc.h>
19#include <linux/init.h>
20#include <linux/fs.h>
21#include <linux/interrupt.h>
22#include <linux/string.h>
23#include <linux/pm.h>
24
25#include <linux/amba/bus.h>
26
27#include <asm/io.h>
28#include <asm/bitops.h>
29#include <asm/hardware.h>
30#include <asm/irq.h>
31#include <asm/rtc.h>
32
33/*
34 * Register definitions
35 */
36#define RTC_DR 0x00 /* Data read register */
37#define RTC_MR 0x04 /* Match register */
38#define RTC_LR 0x08 /* Data load register */
39#define RTC_CR 0x0c /* Control register */
40#define RTC_IMSC 0x10 /* Interrupt mask and set register */
41#define RTC_RIS 0x14 /* Raw interrupt status register */
42#define RTC_MIS 0x18 /* Masked interrupt status register */
43#define RTC_ICR 0x1c /* Interrupt clear register */
44
45struct pl031_local {
46 struct rtc_device *rtc;
47 void __iomem *base;
48};
49
50static irqreturn_t pl031_interrupt(int irq, void *dev_id, struct pt_regs *regs)
51{
52 struct rtc_device *rtc = dev_id;
53
54 rtc_update_irq(&rtc->class_dev, 1, RTC_AF);
55
56 return IRQ_HANDLED;
57}
58
59static int pl031_open(struct device *dev)
60{
61 /*
62 * We request IRQ in pl031_probe, so nothing to do here...
63 */
64 return 0;
65}
66
67static void pl031_release(struct device *dev)
68{
69}
70
71static int pl031_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
72{
73 struct pl031_local *ldata = dev_get_drvdata(dev);
74
75 switch (cmd) {
76 case RTC_AIE_OFF:
77 __raw_writel(1, ldata->base + RTC_MIS);
78 return 0;
79 case RTC_AIE_ON:
80 __raw_writel(0, ldata->base + RTC_MIS);
81 return 0;
82 }
83
84 return -ENOIOCTLCMD;
85}
86
87static int pl031_read_time(struct device *dev, struct rtc_time *tm)
88{
89 struct pl031_local *ldata = dev_get_drvdata(dev);
90
91 rtc_time_to_tm(__raw_readl(ldata->base + RTC_DR), tm);
92
93 return 0;
94}
95
96static int pl031_set_time(struct device *dev, struct rtc_time *tm)
97{
98 unsigned long time;
99 struct pl031_local *ldata = dev_get_drvdata(dev);
100
101 rtc_tm_to_time(tm, &time);
102 __raw_writel(time, ldata->base + RTC_LR);
103
104 return 0;
105}
106
107static int pl031_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
108{
109 struct pl031_local *ldata = dev_get_drvdata(dev);
110
111 rtc_time_to_tm(__raw_readl(ldata->base + RTC_MR), &alarm->time);
112 alarm->pending = __raw_readl(ldata->base + RTC_RIS);
113 alarm->enabled = __raw_readl(ldata->base + RTC_IMSC);
114
115 return 0;
116}
117
118static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
119{
120 struct pl031_local *ldata = dev_get_drvdata(dev);
121 unsigned long time;
122
123 rtc_tm_to_time(&alarm->time, &time);
124
125 __raw_writel(time, ldata->base + RTC_MR);
126 __raw_writel(!alarm->enabled, ldata->base + RTC_MIS);
127
128 return 0;
129}
130
131static struct rtc_class_ops pl031_ops = {
132 .open = pl031_open,
133 .release = pl031_release,
134 .ioctl = pl031_ioctl,
135 .read_time = pl031_read_time,
136 .set_time = pl031_set_time,
137 .read_alarm = pl031_read_alarm,
138 .set_alarm = pl031_set_alarm,
139};
140
141static int pl031_remove(struct amba_device *adev)
142{
143 struct pl031_local *ldata = dev_get_drvdata(&adev->dev);
144
145 if (ldata) {
146 dev_set_drvdata(&adev->dev, NULL);
147 free_irq(adev->irq[0], ldata->rtc);
148 rtc_device_unregister(ldata->rtc);
149 iounmap(ldata->base);
150 kfree(ldata);
151 }
152
153 return 0;
154}
155
156static int pl031_probe(struct amba_device *adev, void *id)
157{
158 int ret;
159 struct pl031_local *ldata;
160
161
162 ldata = kmalloc(sizeof(struct pl031_local), GFP_KERNEL);
163 if (!ldata) {
164 ret = -ENOMEM;
165 goto out;
166 }
167 dev_set_drvdata(&adev->dev, ldata);
168
169 ldata->base = ioremap(adev->res.start,
170 adev->res.end - adev->res.start + 1);
171 if (!ldata->base) {
172 ret = -ENOMEM;
173 goto out_no_remap;
174 }
175
176 if (request_irq(adev->irq[0], pl031_interrupt, SA_INTERRUPT,
177 "rtc-pl031", ldata->rtc)) {
178 ret = -EIO;
179 goto out_no_irq;
180 }
181
182 ldata->rtc = rtc_device_register("pl031", &adev->dev, &pl031_ops,
183 THIS_MODULE);
184 if (IS_ERR(ldata->rtc)) {
185 ret = PTR_ERR(ldata->rtc);
186 goto out_no_rtc;
187 }
188
189 return 0;
190
191out_no_rtc:
192 free_irq(adev->irq[0], ldata->rtc);
193out_no_irq:
194 iounmap(ldata->base);
195out_no_remap:
196 dev_set_drvdata(&adev->dev, NULL);
197 kfree(ldata);
198out:
199 return ret;
200}
201
202static struct amba_id pl031_ids[] __initdata = {
203 {
204 .id = 0x00041031,
205 .mask = 0x000fffff, },
206 {0, 0},
207};
208
209static struct amba_driver pl031_driver = {
210 .drv = {
211 .name = "rtc-pl031",
212 },
213 .id_table = pl031_ids,
214 .probe = pl031_probe,
215 .remove = pl031_remove,
216};
217
218static int __init pl031_init(void)
219{
220 return amba_driver_register(&pl031_driver);
221}
222
223static void __exit pl031_exit(void)
224{
225 amba_driver_unregister(&pl031_driver);
226}
227
228module_init(pl031_init);
229module_exit(pl031_exit);
230
231MODULE_AUTHOR("Deepak Saxena <dsaxena@plexity.net");
232MODULE_DESCRIPTION("ARM AMBA PL031 RTC Driver");
233MODULE_LICENSE("GPL");