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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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
df17f631 | 26 | |
27 | #include <mach/platform.h> | |
28 | #include <mach/stmp3xxx.h> | |
29 | #include <mach/regs-rtc.h> | |
30 | ||
31 | struct stmp3xxx_rtc_data { | |
32 | struct rtc_device *rtc; | |
33 | unsigned irq_count; | |
34 | void __iomem *io; | |
35 | int irq_alarm, irq_1msec; | |
36 | }; | |
37 | ||
38 | static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data) | |
39 | { | |
40 | /* | |
41 | * The datasheet doesn't say which way round the | |
42 | * NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0, | |
43 | * 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS | |
44 | */ | |
45 | while (__raw_readl(rtc_data->io + HW_RTC_STAT) & | |
46 | BF(0x80, RTC_STAT_STALE_REGS)) | |
47 | cpu_relax(); | |
48 | } | |
49 | ||
50 | /* Time read/write */ | |
51 | static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) | |
52 | { | |
53 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
54 | ||
55 | stmp3xxx_wait_time(rtc_data); | |
56 | rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t) | |
61 | { | |
62 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
63 | ||
64 | __raw_writel(t, rtc_data->io + HW_RTC_SECONDS); | |
65 | stmp3xxx_wait_time(rtc_data); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | /* interrupt(s) handler */ | |
70 | static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id) | |
71 | { | |
72 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id); | |
73 | u32 status; | |
74 | u32 events = 0; | |
75 | ||
76 | status = __raw_readl(rtc_data->io + HW_RTC_CTRL) & | |
77 | (BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ); | |
78 | ||
79 | if (status & BM_RTC_CTRL_ALARM_IRQ) { | |
80 | stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ, | |
81 | rtc_data->io + HW_RTC_CTRL); | |
82 | events |= RTC_AF | RTC_IRQF; | |
83 | } | |
84 | ||
85 | if (status & BM_RTC_CTRL_ONEMSEC_IRQ) { | |
86 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ, | |
87 | rtc_data->io + HW_RTC_CTRL); | |
88 | if (++rtc_data->irq_count % 1000 == 0) { | |
89 | events |= RTC_UF | RTC_IRQF; | |
90 | rtc_data->irq_count = 0; | |
91 | } | |
92 | } | |
93 | ||
94 | if (events) | |
95 | rtc_update_irq(rtc_data->rtc, 1, events); | |
96 | ||
97 | return IRQ_HANDLED; | |
98 | } | |
99 | ||
100 | static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
101 | { | |
102 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
103 | void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0, | |
104 | *ctl = rtc_data->io + HW_RTC_CTRL; | |
105 | ||
106 | if (enabled) { | |
107 | stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN | | |
108 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p); | |
109 | stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl); | |
110 | } else { | |
111 | stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN | | |
112 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p); | |
113 | stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl); | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
df17f631 | 118 | static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
119 | { | |
120 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
121 | ||
122 | rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) | |
127 | { | |
128 | unsigned long t; | |
129 | struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev); | |
130 | ||
131 | rtc_tm_to_time(&alm->time, &t); | |
132 | __raw_writel(t, rtc_data->io + HW_RTC_ALARM); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static struct rtc_class_ops stmp3xxx_rtc_ops = { | |
137 | .alarm_irq_enable = | |
138 | stmp3xxx_alarm_irq_enable, | |
df17f631 | 139 | .read_time = stmp3xxx_rtc_gettime, |
140 | .set_mmss = stmp3xxx_rtc_set_mmss, | |
141 | .read_alarm = stmp3xxx_rtc_read_alarm, | |
142 | .set_alarm = stmp3xxx_rtc_set_alarm, | |
143 | }; | |
144 | ||
145 | static int stmp3xxx_rtc_remove(struct platform_device *pdev) | |
146 | { | |
147 | struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev); | |
148 | ||
149 | if (!rtc_data) | |
150 | return 0; | |
151 | ||
152 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN, | |
153 | rtc_data->io + HW_RTC_CTRL); | |
154 | free_irq(rtc_data->irq_alarm, &pdev->dev); | |
155 | free_irq(rtc_data->irq_1msec, &pdev->dev); | |
156 | rtc_device_unregister(rtc_data->rtc); | |
157 | iounmap(rtc_data->io); | |
158 | kfree(rtc_data); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int stmp3xxx_rtc_probe(struct platform_device *pdev) | |
164 | { | |
165 | struct stmp3xxx_rtc_data *rtc_data; | |
166 | struct resource *r; | |
167 | int err; | |
168 | ||
169 | rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL); | |
170 | if (!rtc_data) | |
171 | return -ENOMEM; | |
172 | ||
173 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
174 | if (!r) { | |
175 | dev_err(&pdev->dev, "failed to get resource\n"); | |
176 | err = -ENXIO; | |
177 | goto out_free; | |
178 | } | |
179 | ||
180 | rtc_data->io = ioremap(r->start, resource_size(r)); | |
181 | if (!rtc_data->io) { | |
182 | dev_err(&pdev->dev, "ioremap failed\n"); | |
183 | err = -EIO; | |
184 | goto out_free; | |
185 | } | |
186 | ||
187 | rtc_data->irq_alarm = platform_get_irq(pdev, 0); | |
188 | rtc_data->irq_1msec = platform_get_irq(pdev, 1); | |
189 | ||
190 | if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) & | |
191 | BM_RTC_STAT_RTC_PRESENT)) { | |
192 | dev_err(&pdev->dev, "no device onboard\n"); | |
193 | err = -ENODEV; | |
194 | goto out_remap; | |
195 | } | |
196 | ||
197 | stmp3xxx_reset_block(rtc_data->io, true); | |
198 | stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN | | |
199 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN | | |
200 | BM_RTC_PERSISTENT0_ALARM_WAKE, | |
201 | rtc_data->io + HW_RTC_PERSISTENT0); | |
202 | rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev, | |
203 | &stmp3xxx_rtc_ops, THIS_MODULE); | |
204 | if (IS_ERR(rtc_data->rtc)) { | |
205 | err = PTR_ERR(rtc_data->rtc); | |
206 | goto out_remap; | |
207 | } | |
208 | ||
209 | rtc_data->irq_count = 0; | |
210 | err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt, | |
211 | IRQF_DISABLED, "RTC alarm", &pdev->dev); | |
212 | if (err) { | |
213 | dev_err(&pdev->dev, "Cannot claim IRQ%d\n", | |
214 | rtc_data->irq_alarm); | |
215 | goto out_irq_alarm; | |
216 | } | |
217 | err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt, | |
218 | IRQF_DISABLED, "RTC tick", &pdev->dev); | |
219 | if (err) { | |
220 | dev_err(&pdev->dev, "Cannot claim IRQ%d\n", | |
221 | rtc_data->irq_1msec); | |
222 | goto out_irq1; | |
223 | } | |
224 | ||
225 | platform_set_drvdata(pdev, rtc_data); | |
226 | ||
227 | return 0; | |
228 | ||
229 | out_irq1: | |
230 | free_irq(rtc_data->irq_alarm, &pdev->dev); | |
231 | out_irq_alarm: | |
232 | stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN, | |
233 | rtc_data->io + HW_RTC_CTRL); | |
234 | rtc_device_unregister(rtc_data->rtc); | |
235 | out_remap: | |
236 | iounmap(rtc_data->io); | |
237 | out_free: | |
238 | kfree(rtc_data); | |
239 | return err; | |
240 | } | |
241 | ||
242 | #ifdef CONFIG_PM | |
243 | static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state) | |
244 | { | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int stmp3xxx_rtc_resume(struct platform_device *dev) | |
249 | { | |
250 | struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev); | |
251 | ||
252 | stmp3xxx_reset_block(rtc_data->io, true); | |
253 | stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN | | |
254 | BM_RTC_PERSISTENT0_ALARM_WAKE_EN | | |
255 | BM_RTC_PERSISTENT0_ALARM_WAKE, | |
256 | rtc_data->io + HW_RTC_PERSISTENT0); | |
257 | return 0; | |
258 | } | |
259 | #else | |
260 | #define stmp3xxx_rtc_suspend NULL | |
261 | #define stmp3xxx_rtc_resume NULL | |
262 | #endif | |
263 | ||
264 | static struct platform_driver stmp3xxx_rtcdrv = { | |
265 | .probe = stmp3xxx_rtc_probe, | |
266 | .remove = stmp3xxx_rtc_remove, | |
267 | .suspend = stmp3xxx_rtc_suspend, | |
268 | .resume = stmp3xxx_rtc_resume, | |
269 | .driver = { | |
270 | .name = "stmp3xxx-rtc", | |
271 | .owner = THIS_MODULE, | |
272 | }, | |
273 | }; | |
274 | ||
275 | static int __init stmp3xxx_rtc_init(void) | |
276 | { | |
277 | return platform_driver_register(&stmp3xxx_rtcdrv); | |
278 | } | |
279 | ||
280 | static void __exit stmp3xxx_rtc_exit(void) | |
281 | { | |
282 | platform_driver_unregister(&stmp3xxx_rtcdrv); | |
283 | } | |
284 | ||
285 | module_init(stmp3xxx_rtc_init); | |
286 | module_exit(stmp3xxx_rtc_exit); | |
287 | ||
288 | MODULE_DESCRIPTION("STMP3xxx RTC Driver"); | |
289 | MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>"); | |
290 | MODULE_LICENSE("GPL"); |