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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / rtc / rtc-msm6242.c
blobfcb113c11122b7a762abd88f700bd53dc1713a15
1 /*
2 * Oki MSM6242 RTC Driver
3 *
4 * Copyright 2009 Geert Uytterhoeven
5 *
6 * Based on the A2000 TOD code in arch/m68k/amiga/config.c
7 * Copyright (C) 1993 Hamish Macdonald
8 */
9
10 #include <linux/delay.h>
11 #include <linux/io.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/rtc.h>
16 #include <linux/slab.h>
17
18
19 enum {
20 MSM6242_SECOND1 = 0x0, /* 1-second digit register */
21 MSM6242_SECOND10 = 0x1, /* 10-second digit register */
22 MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */
23 MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */
24 MSM6242_HOUR1 = 0x4, /* 1-hour digit register */
25 MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */
26 MSM6242_DAY1 = 0x6, /* 1-day digit register */
27 MSM6242_DAY10 = 0x7, /* 10-day digit register */
28 MSM6242_MONTH1 = 0x8, /* 1-month digit register */
29 MSM6242_MONTH10 = 0x9, /* 10-month digit register */
30 MSM6242_YEAR1 = 0xa, /* 1-year digit register */
31 MSM6242_YEAR10 = 0xb, /* 10-year digit register */
32 MSM6242_WEEK = 0xc, /* Week register */
33 MSM6242_CD = 0xd, /* Control Register D */
34 MSM6242_CE = 0xe, /* Control Register E */
35 MSM6242_CF = 0xf, /* Control Register F */
36 };
37
38 #define MSM6242_HOUR10_AM (0 << 2)
39 #define MSM6242_HOUR10_PM (1 << 2)
40 #define MSM6242_HOUR10_HR_MASK (3 << 0)
41
42 #define MSM6242_WEEK_SUNDAY 0
43 #define MSM6242_WEEK_MONDAY 1
44 #define MSM6242_WEEK_TUESDAY 2
45 #define MSM6242_WEEK_WEDNESDAY 3
46 #define MSM6242_WEEK_THURSDAY 4
47 #define MSM6242_WEEK_FRIDAY 5
48 #define MSM6242_WEEK_SATURDAY 6
49
50 #define MSM6242_CD_30_S_ADJ (1 << 3) /* 30-second adjustment */
51 #define MSM6242_CD_IRQ_FLAG (1 << 2)
52 #define MSM6242_CD_BUSY (1 << 1)
53 #define MSM6242_CD_HOLD (1 << 0)
54
55 #define MSM6242_CE_T_MASK (3 << 2)
56 #define MSM6242_CE_T_64HZ (0 << 2) /* period 1/64 second */
57 #define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */
58 #define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */
59 #define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */
60
61 #define MSM6242_CE_ITRPT_STND (1 << 1)
62 #define MSM6242_CE_MASK (1 << 0) /* STD.P output control */
63
64 #define MSM6242_CF_TEST (1 << 3)
65 #define MSM6242_CF_12H (0 << 2)
66 #define MSM6242_CF_24H (1 << 2)
67 #define MSM6242_CF_STOP (1 << 1)
68 #define MSM6242_CF_REST (1 << 0) /* reset */
69
70
71 struct msm6242_priv {
72 u32 __iomem *regs;
73 struct rtc_device *rtc;
74 };
75
76 static inline unsigned int msm6242_read(struct msm6242_priv *priv,
77 unsigned int reg)
78 {
79 return __raw_readl(&priv->regs[reg]) & 0xf;
80 }
81
82 static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val,
83 unsigned int reg)
84 {
85 __raw_writel(val, &priv->regs[reg]);
86 }
87
88 static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val,
89 unsigned int reg)
90 {
91 msm6242_write(priv, msm6242_read(priv, reg) | val, reg);
92 }
93
94 static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val,
95 unsigned int reg)
96 {
97 msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg);
98 }
99
100 static void msm6242_lock(struct msm6242_priv *priv)
101 {
102 int cnt = 5;
103
104 msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
105
106 while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) {
107 msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
108 udelay(70);
109 msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
110 cnt--;
111 }
112
113 if (!cnt)
114 pr_warning("msm6242: timed out waiting for RTC (0x%x)\n",
115 msm6242_read(priv, MSM6242_CD));
116 }
117
118 static void msm6242_unlock(struct msm6242_priv *priv)
119 {
120 msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
121 }
122
123 static int msm6242_read_time(struct device *dev, struct rtc_time *tm)
124 {
125 struct msm6242_priv *priv = dev_get_drvdata(dev);
126
127 msm6242_lock(priv);
128
129 tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 +
130 msm6242_read(priv, MSM6242_SECOND1);
131 tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 +
132 msm6242_read(priv, MSM6242_MINUTE1);
133 tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10 & 3)) * 10 +
134 msm6242_read(priv, MSM6242_HOUR1);
135 tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 +
136 msm6242_read(priv, MSM6242_DAY1);
137 tm->tm_wday = msm6242_read(priv, MSM6242_WEEK);
138 tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 +
139 msm6242_read(priv, MSM6242_MONTH1) - 1;
140 tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 +
141 msm6242_read(priv, MSM6242_YEAR1);
142 if (tm->tm_year <= 69)
143 tm->tm_year += 100;
144
145 if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) {
146 unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) &
147 MSM6242_HOUR10_PM;
148 if (!pm && tm->tm_hour == 12)
149 tm->tm_hour = 0;
150 else if (pm && tm->tm_hour != 12)
151 tm->tm_hour += 12;
152 }
153
154 msm6242_unlock(priv);
155
156 return rtc_valid_tm(tm);
157 }
158
159 static int msm6242_set_time(struct device *dev, struct rtc_time *tm)
160 {
161 struct msm6242_priv *priv = dev_get_drvdata(dev);
162
163 msm6242_lock(priv);
164
165 msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10);
166 msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1);
167 msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10);
168 msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1);
169 if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)
170 msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
171 else if (tm->tm_hour >= 12)
172 msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10,
173 MSM6242_HOUR10);
174 else
175 msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
176 msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1);
177 msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10);
178 msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1);
179 if (tm->tm_wday != -1)
180 msm6242_write(priv, tm->tm_wday, MSM6242_WEEK);
181 msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10);
182 msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1);
183 if (tm->tm_year >= 100)
184 tm->tm_year -= 100;
185 msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10);
186 msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1);
187
188 msm6242_unlock(priv);
189 return 0;
190 }
191
192 static const struct rtc_class_ops msm6242_rtc_ops = {
193 .read_time = msm6242_read_time,
194 .set_time = msm6242_set_time,
195 };
196
197 static int __init msm6242_rtc_probe(struct platform_device *dev)
198 {
199 struct resource *res;
200 struct msm6242_priv *priv;
201 struct rtc_device *rtc;
202 int error;
203
204 res = platform_get_resource(dev, IORESOURCE_MEM, 0);
205 if (!res)
206 return -ENODEV;
207
208 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
209 if (!priv)
210 return -ENOMEM;
211
212 priv->regs = ioremap(res->start, resource_size(res));
213 if (!priv->regs) {
214 error = -ENOMEM;
215 goto out_free_priv;
216 }
217 platform_set_drvdata(dev, priv);
218
219 rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops,
220 THIS_MODULE);
221 if (IS_ERR(rtc)) {
222 error = PTR_ERR(rtc);
223 goto out_unmap;
224 }
225
226 priv->rtc = rtc;
227 return 0;
228
229 out_unmap:
230 platform_set_drvdata(dev, NULL);
231 iounmap(priv->regs);
232 out_free_priv:
233 kfree(priv);
234 return error;
235 }
236
237 static int __exit msm6242_rtc_remove(struct platform_device *dev)
238 {
239 struct msm6242_priv *priv = platform_get_drvdata(dev);
240
241 rtc_device_unregister(priv->rtc);
242 iounmap(priv->regs);
243 kfree(priv);
244 return 0;
245 }
246
247 static struct platform_driver msm6242_rtc_driver = {
248 .driver = {
249 .name = "rtc-msm6242",
250 .owner = THIS_MODULE,
251 },
252 .remove = __exit_p(msm6242_rtc_remove),
253 };
254
255 static int __init msm6242_rtc_init(void)
256 {
257 return platform_driver_probe(&msm6242_rtc_driver, msm6242_rtc_probe);
258 }
259
260 static void __exit msm6242_rtc_fini(void)
261 {
262 platform_driver_unregister(&msm6242_rtc_driver);
263 }
264
265 module_init(msm6242_rtc_init);
266 module_exit(msm6242_rtc_fini);
267
268 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
269 MODULE_LICENSE("GPL");
270 MODULE_DESCRIPTION("Oki MSM6242 RTC driver");
271 MODULE_ALIAS("platform:rtc-msm6242");
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