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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 | return __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 | |
218 | rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops, |
219 | THIS_MODULE); |
220 | if (IS_ERR(rtc)) { |
221 | error = PTR_ERR(rtc); |
222 | goto out_unmap; |
223 | } |
224 | |
225 | priv->rtc = rtc; |
226 | platform_set_drvdata(dev, priv); |
227 | return 0; |
228 | |
229 | out_unmap: |
230 | iounmap(priv->regs); |
231 | out_free_priv: |
232 | kfree(priv); |
233 | return error; |
234 | } |
235 | |
236 | static int __exit msm6242_rtc_remove(struct platform_device *dev) |
237 | { |
238 | struct msm6242_priv *priv = platform_get_drvdata(dev); |
239 | |
240 | rtc_device_unregister(priv->rtc); |
241 | iounmap(priv->regs); |
242 | kfree(priv); |
243 | return 0; |
244 | } |
245 | |
246 | static struct platform_driver msm6242_rtc_driver = { |
247 | .driver = { |
248 | .name = "rtc-msm6242", |
249 | .owner = THIS_MODULE, |
250 | }, |
251 | .remove = __exit_p(msm6242_rtc_remove), |
252 | }; |
253 | |
254 | static int __init msm6242_rtc_init(void) |
255 | { |
256 | return platform_driver_probe(&msm6242_rtc_driver, msm6242_rtc_probe); |
257 | } |
258 | |
259 | static void __exit msm6242_rtc_fini(void) |
260 | { |
261 | platform_driver_unregister(&msm6242_rtc_driver); |
262 | } |
263 | |
264 | module_init(msm6242_rtc_init); |
265 | module_exit(msm6242_rtc_fini); |
266 | |
267 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); |
268 | MODULE_LICENSE("GPL"); |
269 | MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); |
270 | MODULE_ALIAS("platform:rtc-msm6242"); |
271 |
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