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4f9b9bba GU |
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 | ||
17 | ||
18 | enum { | |
19 | MSM6242_SECOND1 = 0x0, /* 1-second digit register */ | |
20 | MSM6242_SECOND10 = 0x1, /* 10-second digit register */ | |
21 | MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */ | |
22 | MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */ | |
23 | MSM6242_HOUR1 = 0x4, /* 1-hour digit register */ | |
24 | MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */ | |
25 | MSM6242_DAY1 = 0x6, /* 1-day digit register */ | |
26 | MSM6242_DAY10 = 0x7, /* 10-day digit register */ | |
27 | MSM6242_MONTH1 = 0x8, /* 1-month digit register */ | |
28 | MSM6242_MONTH10 = 0x9, /* 10-month digit register */ | |
29 | MSM6242_YEAR1 = 0xa, /* 1-year digit register */ | |
30 | MSM6242_YEAR10 = 0xb, /* 10-year digit register */ | |
31 | MSM6242_WEEK = 0xc, /* Week register */ | |
32 | MSM6242_CD = 0xd, /* Control Register D */ | |
33 | MSM6242_CE = 0xe, /* Control Register E */ | |
34 | MSM6242_CF = 0xf, /* Control Register F */ | |
35 | }; | |
36 | ||
37 | #define MSM6242_HOUR10_AM (0 << 2) | |
38 | #define MSM6242_HOUR10_PM (1 << 2) | |
39 | #define MSM6242_HOUR10_HR_MASK (3 << 0) | |
40 | ||
41 | #define MSM6242_WEEK_SUNDAY 0 | |
42 | #define MSM6242_WEEK_MONDAY 1 | |
43 | #define MSM6242_WEEK_TUESDAY 2 | |
44 | #define MSM6242_WEEK_WEDNESDAY 3 | |
45 | #define MSM6242_WEEK_THURSDAY 4 | |
46 | #define MSM6242_WEEK_FRIDAY 5 | |
47 | #define MSM6242_WEEK_SATURDAY 6 | |
48 | ||
49 | #define MSM6242_CD_30_S_ADJ (1 << 3) /* 30-second adjustment */ | |
50 | #define MSM6242_CD_IRQ_FLAG (1 << 2) | |
51 | #define MSM6242_CD_BUSY (1 << 1) | |
52 | #define MSM6242_CD_HOLD (1 << 0) | |
53 | ||
54 | #define MSM6242_CE_T_MASK (3 << 2) | |
55 | #define MSM6242_CE_T_64HZ (0 << 2) /* period 1/64 second */ | |
56 | #define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */ | |
57 | #define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */ | |
58 | #define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */ | |
59 | ||
60 | #define MSM6242_CE_ITRPT_STND (1 << 1) | |
61 | #define MSM6242_CE_MASK (1 << 0) /* STD.P output control */ | |
62 | ||
63 | #define MSM6242_CF_TEST (1 << 3) | |
64 | #define MSM6242_CF_12H (0 << 2) | |
65 | #define MSM6242_CF_24H (1 << 2) | |
66 | #define MSM6242_CF_STOP (1 << 1) | |
67 | #define MSM6242_CF_REST (1 << 0) /* reset */ | |
68 | ||
69 | ||
70 | struct msm6242_priv { | |
71 | u32 __iomem *regs; | |
72 | struct rtc_device *rtc; | |
73 | }; | |
74 | ||
75 | static inline unsigned int msm6242_read(struct msm6242_priv *priv, | |
76 | unsigned int reg) | |
77 | { | |
78 | return __raw_readl(&priv->regs[reg]) & 0xf; | |
79 | } | |
80 | ||
81 | static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val, | |
82 | unsigned int reg) | |
83 | { | |
84 | return __raw_writel(val, &priv->regs[reg]); | |
85 | } | |
86 | ||
87 | static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val, | |
88 | unsigned int reg) | |
89 | { | |
90 | msm6242_write(priv, msm6242_read(priv, reg) | val, reg); | |
91 | } | |
92 | ||
93 | static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val, | |
94 | unsigned int reg) | |
95 | { | |
96 | msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg); | |
97 | } | |
98 | ||
99 | static void msm6242_lock(struct msm6242_priv *priv) | |
100 | { | |
101 | int cnt = 5; | |
102 | ||
103 | msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD); | |
104 | ||
105 | while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) { | |
106 | msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD); | |
107 | udelay(70); | |
108 | msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD); | |
109 | cnt--; | |
110 | } | |
111 | ||
112 | if (!cnt) | |
113 | pr_warning("msm6242: timed out waiting for RTC (0x%x)\n", | |
114 | msm6242_read(priv, MSM6242_CD)); | |
115 | } | |
116 | ||
117 | static void msm6242_unlock(struct msm6242_priv *priv) | |
118 | { | |
119 | msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD); | |
120 | } | |
121 | ||
122 | static int msm6242_read_time(struct device *dev, struct rtc_time *tm) | |
123 | { | |
124 | struct msm6242_priv *priv = dev_get_drvdata(dev); | |
125 | ||
126 | msm6242_lock(priv); | |
127 | ||
128 | tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 + | |
129 | msm6242_read(priv, MSM6242_SECOND1); | |
130 | tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 + | |
131 | msm6242_read(priv, MSM6242_MINUTE1); | |
132 | tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10 & 3)) * 10 + | |
133 | msm6242_read(priv, MSM6242_HOUR1); | |
134 | tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 + | |
135 | msm6242_read(priv, MSM6242_DAY1); | |
136 | tm->tm_wday = msm6242_read(priv, MSM6242_WEEK); | |
137 | tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 + | |
138 | msm6242_read(priv, MSM6242_MONTH1) - 1; | |
139 | tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 + | |
140 | msm6242_read(priv, MSM6242_YEAR1); | |
141 | if (tm->tm_year <= 69) | |
142 | tm->tm_year += 100; | |
143 | ||
144 | if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) { | |
145 | unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) & | |
146 | MSM6242_HOUR10_PM; | |
147 | if (!pm && tm->tm_hour == 12) | |
148 | tm->tm_hour = 0; | |
149 | else if (pm && tm->tm_hour != 12) | |
150 | tm->tm_hour += 12; | |
151 | } | |
152 | ||
153 | msm6242_unlock(priv); | |
154 | ||
155 | return rtc_valid_tm(tm); | |
156 | } | |
157 | ||
158 | static int msm6242_set_time(struct device *dev, struct rtc_time *tm) | |
159 | { | |
160 | struct msm6242_priv *priv = dev_get_drvdata(dev); | |
161 | ||
162 | msm6242_lock(priv); | |
163 | ||
164 | msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10); | |
165 | msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1); | |
166 | msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10); | |
167 | msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1); | |
168 | if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H) | |
169 | msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); | |
170 | else if (tm->tm_hour >= 12) | |
171 | msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10, | |
172 | MSM6242_HOUR10); | |
173 | else | |
174 | msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); | |
175 | msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1); | |
176 | msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10); | |
177 | msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1); | |
178 | if (tm->tm_wday != -1) | |
179 | msm6242_write(priv, tm->tm_wday, MSM6242_WEEK); | |
180 | msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10); | |
181 | msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1); | |
182 | if (tm->tm_year >= 100) | |
183 | tm->tm_year -= 100; | |
184 | msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10); | |
185 | msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1); | |
186 | ||
187 | msm6242_unlock(priv); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static const struct rtc_class_ops msm6242_rtc_ops = { | |
192 | .read_time = msm6242_read_time, | |
193 | .set_time = msm6242_set_time, | |
194 | }; | |
195 | ||
196 | static int __init msm6242_rtc_probe(struct platform_device *dev) | |
197 | { | |
198 | struct resource *res; | |
199 | struct msm6242_priv *priv; | |
200 | struct rtc_device *rtc; | |
201 | int error; | |
202 | ||
203 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
204 | if (!res) | |
205 | return -ENODEV; | |
206 | ||
207 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
208 | if (!priv) | |
209 | return -ENOMEM; | |
210 | ||
211 | priv->regs = ioremap(res->start, resource_size(res)); | |
212 | if (!priv->regs) { | |
213 | error = -ENOMEM; | |
214 | goto out_free_priv; | |
215 | } | |
216 | ||
217 | rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops, | |
218 | THIS_MODULE); | |
219 | if (IS_ERR(rtc)) { | |
220 | error = PTR_ERR(rtc); | |
221 | goto out_unmap; | |
222 | } | |
223 | ||
224 | priv->rtc = rtc; | |
225 | platform_set_drvdata(dev, priv); | |
226 | return 0; | |
227 | ||
228 | out_unmap: | |
229 | iounmap(priv->regs); | |
230 | out_free_priv: | |
231 | kfree(priv); | |
232 | return error; | |
233 | } | |
234 | ||
235 | static int __exit msm6242_rtc_remove(struct platform_device *dev) | |
236 | { | |
237 | struct msm6242_priv *priv = platform_get_drvdata(dev); | |
238 | ||
239 | rtc_device_unregister(priv->rtc); | |
240 | iounmap(priv->regs); | |
241 | kfree(priv); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static struct platform_driver msm6242_rtc_driver = { | |
246 | .driver = { | |
247 | .name = "rtc-msm6242", | |
248 | .owner = THIS_MODULE, | |
249 | }, | |
250 | .remove = __exit_p(msm6242_rtc_remove), | |
251 | }; | |
252 | ||
253 | static int __init msm6242_rtc_init(void) | |
254 | { | |
255 | return platform_driver_probe(&msm6242_rtc_driver, msm6242_rtc_probe); | |
256 | } | |
257 | ||
258 | static void __exit msm6242_rtc_fini(void) | |
259 | { | |
260 | platform_driver_unregister(&msm6242_rtc_driver); | |
261 | } | |
262 | ||
263 | module_init(msm6242_rtc_init); | |
264 | module_exit(msm6242_rtc_fini); | |
265 | ||
266 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); | |
267 | MODULE_LICENSE("GPL"); | |
268 | MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); | |
269 | MODULE_ALIAS("platform:rtc-msm6242"); |