Commit | Line | Data |
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df17f631 | 1 | /* |
2 | * Freescale STMP37XX/STMP378X Real Time Clock driver | |
3 | * | |
4 | * Copyright (c) 2007 Sigmatel, Inc. | |
5 | * Peter Hartley, <peter.hartley@sigmatel.com> | |
6 | * | |
7 | * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. | |
8 | * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * The code contained herein is licensed under the GNU General Public | |
13 | * License. You may obtain a copy of the GNU General Public License | |
14 | * Version 2 or later at the following locations: | |
15 | * | |
16 | * http://www.opensource.org/licenses/gpl-license.html | |
17 | * http://www.gnu.org/copyleft/gpl.html | |
18 | */ | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
b5167159 | 21 | #include <linux/io.h> |
df17f631 | 22 | #include <linux/init.h> |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/rtc.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
df17f631 | 27 | |
46b21218 | 28 | #include <mach/common.h> |
47eac337 WS |
29 | |
30 | #define STMP3XXX_RTC_CTRL 0x0 | |
b5167159 WS |
31 | #define STMP3XXX_RTC_CTRL_SET 0x4 |
32 | #define STMP3XXX_RTC_CTRL_CLR 0x8 | |
47eac337 WS |
33 | #define STMP3XXX_RTC_CTRL_ALARM_IRQ_EN 0x00000001 |
34 | #define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN 0x00000002 | |
35 | #define STMP3XXX_RTC_CTRL_ALARM_IRQ 0x00000004 | |
36 | #define STMP3XXX_RTC_CTRL_ONEMSEC_IRQ 0x00000008 | |
37 | ||
38 | #define STMP3XXX_RTC_STAT 0x10 | |
39 | #define STMP3XXX_RTC_STAT_STALE_SHIFT 16 | |
40 | #define STMP3XXX_RTC_STAT_RTC_PRESENT 0x80000000 | |
41 | ||
42 | #define STMP3XXX_RTC_SECONDS 0x30 | |
43 | ||
44 | #define STMP3XXX_RTC_ALARM 0x40 | |
45 | ||
46 | #define STMP3XXX_RTC_PERSISTENT0 0x60 | |
b5167159 WS |
47 | #define STMP3XXX_RTC_PERSISTENT0_SET 0x64 |
48 | #define STMP3XXX_RTC_PERSISTENT0_CLR 0x68 | |
47eac337 WS |
49 | #define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN 0x00000002 |
50 | #define STMP3XXX_RTC_PERSISTENT0_ALARM_EN 0x00000004 | |
51 | #define STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE 0x00000080 | |
df17f631 | 52 | |
53 | struct stmp3xxx_rtc_data { | |
54 | struct rtc_device *rtc; | |
55 | unsigned irq_count; | |
56 | void __iomem *io; | |
57 | int irq_alarm, irq_1msec; | |
58 | }; | |
59 | ||
60 | static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data) | |
61 | { | |
62 | /* | |
63 | * The datasheet doesn't say which way round the | |
64 | * NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0, | |
65 | * 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS | |
66 | */ | |
b5167159 | 67 | while (readl(rtc_data->io + STMP3XXX_RTC_STAT) & |
47eac337 | 68 | (0x80 << STMP3XXX_RTC_STAT_STALE_SHIFT)) |
df17f631 | 69 | cpu_relax(); |
70 | } | |
71 | ||
72 | /* Time read/write */ | |
73 | static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) | |
74 | { | |
75 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
76 | ||
77 | stmp3xxx_wait_time(rtc_data); | |
b5167159 | 78 | rtc_time_to_tm(readl(rtc_data->io + STMP3XXX_RTC_SECONDS), rtc_tm); |
df17f631 | 79 | return 0; |
80 | } | |
81 | ||
82 | static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t) | |
83 | { | |
84 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
85 | ||
b5167159 | 86 | writel(t, rtc_data->io + STMP3XXX_RTC_SECONDS); |
df17f631 | 87 | stmp3xxx_wait_time(rtc_data); |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* interrupt(s) handler */ | |
92 | static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id) | |
93 | { | |
94 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id); | |
95 | u32 status; | |
96 | u32 events = 0; | |
97 | ||
b5167159 | 98 | status = readl(rtc_data->io + STMP3XXX_RTC_CTRL) & |
47eac337 WS |
99 | (STMP3XXX_RTC_CTRL_ALARM_IRQ | |
100 | STMP3XXX_RTC_CTRL_ONEMSEC_IRQ); | |
df17f631 | 101 | |
47eac337 | 102 | if (status & STMP3XXX_RTC_CTRL_ALARM_IRQ) { |
b5167159 WS |
103 | writel(STMP3XXX_RTC_CTRL_ALARM_IRQ, |
104 | rtc_data->io + STMP3XXX_RTC_CTRL_CLR); | |
df17f631 | 105 | events |= RTC_AF | RTC_IRQF; |
106 | } | |
107 | ||
47eac337 | 108 | if (status & STMP3XXX_RTC_CTRL_ONEMSEC_IRQ) { |
b5167159 WS |
109 | writel(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ, |
110 | rtc_data->io + STMP3XXX_RTC_CTRL_CLR); | |
df17f631 | 111 | if (++rtc_data->irq_count % 1000 == 0) { |
112 | events |= RTC_UF | RTC_IRQF; | |
113 | rtc_data->irq_count = 0; | |
114 | } | |
115 | } | |
116 | ||
117 | if (events) | |
118 | rtc_update_irq(rtc_data->rtc, 1, events); | |
119 | ||
120 | return IRQ_HANDLED; | |
121 | } | |
122 | ||
123 | static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
124 | { | |
125 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
df17f631 | 126 | |
127 | if (enabled) { | |
b5167159 WS |
128 | writel(STMP3XXX_RTC_PERSISTENT0_ALARM_EN | |
129 | STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN, | |
130 | rtc_data->io + STMP3XXX_RTC_PERSISTENT0_SET); | |
131 | writel(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, | |
132 | rtc_data->io + STMP3XXX_RTC_CTRL_SET); | |
df17f631 | 133 | } else { |
b5167159 WS |
134 | writel(STMP3XXX_RTC_PERSISTENT0_ALARM_EN | |
135 | STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN, | |
136 | rtc_data->io + STMP3XXX_RTC_PERSISTENT0_CLR); | |
137 | writel(STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, | |
138 | rtc_data->io + STMP3XXX_RTC_CTRL_CLR); | |
df17f631 | 139 | } |
140 | return 0; | |
141 | } | |
142 | ||
df17f631 | 143 | static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
144 | { | |
145 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
146 | ||
b5167159 | 147 | rtc_time_to_tm(readl(rtc_data->io + STMP3XXX_RTC_ALARM), &alm->time); |
df17f631 | 148 | return 0; |
149 | } | |
150 | ||
151 | static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
152 | { | |
153 | unsigned long t; | |
154 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
155 | ||
156 | rtc_tm_to_time(&alm->time, &t); | |
b5167159 | 157 | writel(t, rtc_data->io + STMP3XXX_RTC_ALARM); |
df17f631 | 158 | return 0; |
159 | } | |
160 | ||
161 | static struct rtc_class_ops stmp3xxx_rtc_ops = { | |
162 | .alarm_irq_enable = | |
163 | stmp3xxx_alarm_irq_enable, | |
df17f631 | 164 | .read_time = stmp3xxx_rtc_gettime, |
165 | .set_mmss = stmp3xxx_rtc_set_mmss, | |
166 | .read_alarm = stmp3xxx_rtc_read_alarm, | |
167 | .set_alarm = stmp3xxx_rtc_set_alarm, | |
168 | }; | |
169 | ||
170 | static int stmp3xxx_rtc_remove(struct platform_device *pdev) | |
171 | { | |
172 | struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev); | |
173 | ||
174 | if (!rtc_data) | |
175 | return 0; | |
176 | ||
b5167159 | 177 | writel(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN | |
47eac337 | 178 | STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, |
b5167159 | 179 | rtc_data->io + STMP3XXX_RTC_CTRL_CLR); |
df17f631 | 180 | free_irq(rtc_data->irq_alarm, &pdev->dev); |
181 | free_irq(rtc_data->irq_1msec, &pdev->dev); | |
182 | rtc_device_unregister(rtc_data->rtc); | |
a91d2bab | 183 | platform_set_drvdata(pdev, NULL); |
df17f631 | 184 | iounmap(rtc_data->io); |
185 | kfree(rtc_data); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static int stmp3xxx_rtc_probe(struct platform_device *pdev) | |
191 | { | |
192 | struct stmp3xxx_rtc_data *rtc_data; | |
193 | struct resource *r; | |
194 | int err; | |
195 | ||
196 | rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL); | |
197 | if (!rtc_data) | |
198 | return -ENOMEM; | |
199 | ||
200 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
201 | if (!r) { | |
202 | dev_err(&pdev->dev, "failed to get resource\n"); | |
203 | err = -ENXIO; | |
204 | goto out_free; | |
205 | } | |
206 | ||
207 | rtc_data->io = ioremap(r->start, resource_size(r)); | |
208 | if (!rtc_data->io) { | |
209 | dev_err(&pdev->dev, "ioremap failed\n"); | |
210 | err = -EIO; | |
211 | goto out_free; | |
212 | } | |
213 | ||
214 | rtc_data->irq_alarm = platform_get_irq(pdev, 0); | |
215 | rtc_data->irq_1msec = platform_get_irq(pdev, 1); | |
216 | ||
b5167159 | 217 | if (!(readl(STMP3XXX_RTC_STAT + rtc_data->io) & |
47eac337 | 218 | STMP3XXX_RTC_STAT_RTC_PRESENT)) { |
df17f631 | 219 | dev_err(&pdev->dev, "no device onboard\n"); |
220 | err = -ENODEV; | |
221 | goto out_remap; | |
222 | } | |
223 | ||
a91d2bab WS |
224 | platform_set_drvdata(pdev, rtc_data); |
225 | ||
46b21218 | 226 | mxs_reset_block(rtc_data->io); |
b5167159 | 227 | writel(STMP3XXX_RTC_PERSISTENT0_ALARM_EN | |
47eac337 WS |
228 | STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN | |
229 | STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE, | |
b5167159 | 230 | rtc_data->io + STMP3XXX_RTC_PERSISTENT0_CLR); |
a91d2bab | 231 | |
df17f631 | 232 | rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev, |
233 | &stmp3xxx_rtc_ops, THIS_MODULE); | |
234 | if (IS_ERR(rtc_data->rtc)) { | |
235 | err = PTR_ERR(rtc_data->rtc); | |
236 | goto out_remap; | |
237 | } | |
238 | ||
239 | rtc_data->irq_count = 0; | |
240 | err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt, | |
241 | IRQF_DISABLED, "RTC alarm", &pdev->dev); | |
242 | if (err) { | |
243 | dev_err(&pdev->dev, "Cannot claim IRQ%d\n", | |
244 | rtc_data->irq_alarm); | |
245 | goto out_irq_alarm; | |
246 | } | |
247 | err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt, | |
248 | IRQF_DISABLED, "RTC tick", &pdev->dev); | |
249 | if (err) { | |
250 | dev_err(&pdev->dev, "Cannot claim IRQ%d\n", | |
251 | rtc_data->irq_1msec); | |
252 | goto out_irq1; | |
253 | } | |
254 | ||
df17f631 | 255 | return 0; |
256 | ||
257 | out_irq1: | |
258 | free_irq(rtc_data->irq_alarm, &pdev->dev); | |
259 | out_irq_alarm: | |
b5167159 | 260 | writel(STMP3XXX_RTC_CTRL_ONEMSEC_IRQ_EN | |
47eac337 | 261 | STMP3XXX_RTC_CTRL_ALARM_IRQ_EN, |
b5167159 | 262 | rtc_data->io + STMP3XXX_RTC_CTRL_CLR); |
df17f631 | 263 | rtc_device_unregister(rtc_data->rtc); |
264 | out_remap: | |
a91d2bab | 265 | platform_set_drvdata(pdev, NULL); |
df17f631 | 266 | iounmap(rtc_data->io); |
267 | out_free: | |
268 | kfree(rtc_data); | |
269 | return err; | |
270 | } | |
271 | ||
272 | #ifdef CONFIG_PM | |
273 | static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state) | |
274 | { | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int stmp3xxx_rtc_resume(struct platform_device *dev) | |
279 | { | |
280 | struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev); | |
281 | ||
46b21218 | 282 | mxs_reset_block(rtc_data->io); |
b5167159 | 283 | writel(STMP3XXX_RTC_PERSISTENT0_ALARM_EN | |
47eac337 WS |
284 | STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE_EN | |
285 | STMP3XXX_RTC_PERSISTENT0_ALARM_WAKE, | |
b5167159 | 286 | rtc_data->io + STMP3XXX_RTC_PERSISTENT0_CLR); |
df17f631 | 287 | return 0; |
288 | } | |
289 | #else | |
290 | #define stmp3xxx_rtc_suspend NULL | |
291 | #define stmp3xxx_rtc_resume NULL | |
292 | #endif | |
293 | ||
294 | static struct platform_driver stmp3xxx_rtcdrv = { | |
295 | .probe = stmp3xxx_rtc_probe, | |
296 | .remove = stmp3xxx_rtc_remove, | |
297 | .suspend = stmp3xxx_rtc_suspend, | |
298 | .resume = stmp3xxx_rtc_resume, | |
299 | .driver = { | |
300 | .name = "stmp3xxx-rtc", | |
301 | .owner = THIS_MODULE, | |
302 | }, | |
303 | }; | |
304 | ||
305 | static int __init stmp3xxx_rtc_init(void) | |
306 | { | |
307 | return platform_driver_register(&stmp3xxx_rtcdrv); | |
308 | } | |
309 | ||
310 | static void __exit stmp3xxx_rtc_exit(void) | |
311 | { | |
312 | platform_driver_unregister(&stmp3xxx_rtcdrv); | |
313 | } | |
314 | ||
315 | module_init(stmp3xxx_rtc_init); | |
316 | module_exit(stmp3xxx_rtc_exit); | |
317 | ||
318 | MODULE_DESCRIPTION("STMP3xxx RTC Driver"); | |
319 | MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>"); | |
320 | MODULE_LICENSE("GPL"); |