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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> | |
21 | #include <linux/init.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/rtc.h> | |
25 | ||
26 | #include <mach/platform.h> | |
27 | #include <mach/stmp3xxx.h> | |
28 | #include <mach/regs-rtc.h> | |
29 | ||
30 | struct stmp3xxx_rtc_data { | |
31 | struct rtc_device *rtc; | |
32 | unsigned irq_count; | |
33 | void __iomem *io; | |
34 | int irq_alarm, irq_1msec; | |
35 | }; | |
36 | ||
37 | static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data) | |
38 | { | |
39 | /* | |
40 | * The datasheet doesn't say which way round the | |
41 | * NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0, | |
42 | * 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS | |
43 | */ | |
44 | while (__raw_readl(rtc_data->io + HW_RTC_STAT) & | |
45 | BF(0x80, RTC_STAT_STALE_REGS)) | |
46 | cpu_relax(); | |
47 | } | |
48 | ||
49 | /* Time read/write */ | |
50 | static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) | |
51 | { | |
52 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
53 | ||
54 | stmp3xxx_wait_time(rtc_data); | |
55 | rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t) | |
60 | { | |
61 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
62 | ||
63 | __raw_writel(t, rtc_data->io + HW_RTC_SECONDS); | |
64 | stmp3xxx_wait_time(rtc_data); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | /* interrupt(s) handler */ | |
69 | static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id) | |
70 | { | |
71 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id); | |
72 | u32 status; | |
73 | u32 events = 0; | |
74 | ||
75 | status = __raw_readl(rtc_data->io + HW_RTC_CTRL) & | |
76 | (BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ); | |
77 | ||
78 | if (status & BM_RTC_CTRL_ALARM_IRQ) { | |
79 | stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ, | |
80 | rtc_data->io + HW_RTC_CTRL); | |
81 | events |= RTC_AF | RTC_IRQF; | |
82 | } | |
83 | ||
84 | if (status & BM_RTC_CTRL_ONEMSEC_IRQ) { | |
85 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ, | |
86 | rtc_data->io + HW_RTC_CTRL); | |
87 | if (++rtc_data->irq_count % 1000 == 0) { | |
88 | events |= RTC_UF | RTC_IRQF; | |
89 | rtc_data->irq_count = 0; | |
90 | } | |
91 | } | |
92 | ||
93 | if (events) | |
94 | rtc_update_irq(rtc_data->rtc, 1, events); | |
95 | ||
96 | return IRQ_HANDLED; | |
97 | } | |
98 | ||
99 | static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
100 | { | |
101 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
102 | void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0, | |
103 | *ctl = rtc_data->io + HW_RTC_CTRL; | |
104 | ||
105 | if (enabled) { | |
106 | stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN | | |
107 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p); | |
108 | stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl); | |
109 | } else { | |
110 | stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN | | |
111 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p); | |
112 | stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl); | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
117 | static int stmp3xxx_update_irq_enable(struct device *dev, unsigned int enabled) | |
118 | { | |
119 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
120 | ||
121 | if (enabled) | |
122 | stmp3xxx_setl(BM_RTC_CTRL_ONEMSEC_IRQ_EN, | |
123 | rtc_data->io + HW_RTC_CTRL); | |
124 | else | |
125 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN, | |
126 | rtc_data->io + HW_RTC_CTRL); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
131 | { | |
132 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
133 | ||
134 | rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time); | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
139 | { | |
140 | unsigned long t; | |
141 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
142 | ||
143 | rtc_tm_to_time(&alm->time, &t); | |
144 | __raw_writel(t, rtc_data->io + HW_RTC_ALARM); | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static struct rtc_class_ops stmp3xxx_rtc_ops = { | |
149 | .alarm_irq_enable = | |
150 | stmp3xxx_alarm_irq_enable, | |
151 | .update_irq_enable = | |
152 | stmp3xxx_update_irq_enable, | |
153 | .read_time = stmp3xxx_rtc_gettime, | |
154 | .set_mmss = stmp3xxx_rtc_set_mmss, | |
155 | .read_alarm = stmp3xxx_rtc_read_alarm, | |
156 | .set_alarm = stmp3xxx_rtc_set_alarm, | |
157 | }; | |
158 | ||
159 | static int stmp3xxx_rtc_remove(struct platform_device *pdev) | |
160 | { | |
161 | struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev); | |
162 | ||
163 | if (!rtc_data) | |
164 | return 0; | |
165 | ||
166 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN, | |
167 | rtc_data->io + HW_RTC_CTRL); | |
168 | free_irq(rtc_data->irq_alarm, &pdev->dev); | |
169 | free_irq(rtc_data->irq_1msec, &pdev->dev); | |
170 | rtc_device_unregister(rtc_data->rtc); | |
171 | iounmap(rtc_data->io); | |
172 | kfree(rtc_data); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | static int stmp3xxx_rtc_probe(struct platform_device *pdev) | |
178 | { | |
179 | struct stmp3xxx_rtc_data *rtc_data; | |
180 | struct resource *r; | |
181 | int err; | |
182 | ||
183 | rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL); | |
184 | if (!rtc_data) | |
185 | return -ENOMEM; | |
186 | ||
187 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
188 | if (!r) { | |
189 | dev_err(&pdev->dev, "failed to get resource\n"); | |
190 | err = -ENXIO; | |
191 | goto out_free; | |
192 | } | |
193 | ||
194 | rtc_data->io = ioremap(r->start, resource_size(r)); | |
195 | if (!rtc_data->io) { | |
196 | dev_err(&pdev->dev, "ioremap failed\n"); | |
197 | err = -EIO; | |
198 | goto out_free; | |
199 | } | |
200 | ||
201 | rtc_data->irq_alarm = platform_get_irq(pdev, 0); | |
202 | rtc_data->irq_1msec = platform_get_irq(pdev, 1); | |
203 | ||
204 | if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) & | |
205 | BM_RTC_STAT_RTC_PRESENT)) { | |
206 | dev_err(&pdev->dev, "no device onboard\n"); | |
207 | err = -ENODEV; | |
208 | goto out_remap; | |
209 | } | |
210 | ||
211 | stmp3xxx_reset_block(rtc_data->io, true); | |
212 | stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN | | |
213 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN | | |
214 | BM_RTC_PERSISTENT0_ALARM_WAKE, | |
215 | rtc_data->io + HW_RTC_PERSISTENT0); | |
216 | rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev, | |
217 | &stmp3xxx_rtc_ops, THIS_MODULE); | |
218 | if (IS_ERR(rtc_data->rtc)) { | |
219 | err = PTR_ERR(rtc_data->rtc); | |
220 | goto out_remap; | |
221 | } | |
222 | ||
223 | rtc_data->irq_count = 0; | |
224 | err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt, | |
225 | IRQF_DISABLED, "RTC alarm", &pdev->dev); | |
226 | if (err) { | |
227 | dev_err(&pdev->dev, "Cannot claim IRQ%d\n", | |
228 | rtc_data->irq_alarm); | |
229 | goto out_irq_alarm; | |
230 | } | |
231 | err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt, | |
232 | IRQF_DISABLED, "RTC tick", &pdev->dev); | |
233 | if (err) { | |
234 | dev_err(&pdev->dev, "Cannot claim IRQ%d\n", | |
235 | rtc_data->irq_1msec); | |
236 | goto out_irq1; | |
237 | } | |
238 | ||
239 | platform_set_drvdata(pdev, rtc_data); | |
240 | ||
241 | return 0; | |
242 | ||
243 | out_irq1: | |
244 | free_irq(rtc_data->irq_alarm, &pdev->dev); | |
245 | out_irq_alarm: | |
246 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN, | |
247 | rtc_data->io + HW_RTC_CTRL); | |
248 | rtc_device_unregister(rtc_data->rtc); | |
249 | out_remap: | |
250 | iounmap(rtc_data->io); | |
251 | out_free: | |
252 | kfree(rtc_data); | |
253 | return err; | |
254 | } | |
255 | ||
256 | #ifdef CONFIG_PM | |
257 | static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state) | |
258 | { | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int stmp3xxx_rtc_resume(struct platform_device *dev) | |
263 | { | |
264 | struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev); | |
265 | ||
266 | stmp3xxx_reset_block(rtc_data->io, true); | |
267 | stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN | | |
268 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN | | |
269 | BM_RTC_PERSISTENT0_ALARM_WAKE, | |
270 | rtc_data->io + HW_RTC_PERSISTENT0); | |
271 | return 0; | |
272 | } | |
273 | #else | |
274 | #define stmp3xxx_rtc_suspend NULL | |
275 | #define stmp3xxx_rtc_resume NULL | |
276 | #endif | |
277 | ||
278 | static struct platform_driver stmp3xxx_rtcdrv = { | |
279 | .probe = stmp3xxx_rtc_probe, | |
280 | .remove = stmp3xxx_rtc_remove, | |
281 | .suspend = stmp3xxx_rtc_suspend, | |
282 | .resume = stmp3xxx_rtc_resume, | |
283 | .driver = { | |
284 | .name = "stmp3xxx-rtc", | |
285 | .owner = THIS_MODULE, | |
286 | }, | |
287 | }; | |
288 | ||
289 | static int __init stmp3xxx_rtc_init(void) | |
290 | { | |
291 | return platform_driver_register(&stmp3xxx_rtcdrv); | |
292 | } | |
293 | ||
294 | static void __exit stmp3xxx_rtc_exit(void) | |
295 | { | |
296 | platform_driver_unregister(&stmp3xxx_rtcdrv); | |
297 | } | |
298 | ||
299 | module_init(stmp3xxx_rtc_init); | |
300 | module_exit(stmp3xxx_rtc_exit); | |
301 | ||
302 | MODULE_DESCRIPTION("STMP3xxx RTC Driver"); | |
303 | MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>"); | |
304 | MODULE_LICENSE("GPL"); |