This source file includes following definitions.
- msm6242_read
- msm6242_write
- msm6242_set
- msm6242_clear
- msm6242_lock
- msm6242_unlock
- msm6242_read_time
- msm6242_set_time
- msm6242_rtc_probe
1
2
3
4
5
6
7
8
9
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/delay.h>
14 #include <linux/io.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/rtc.h>
19 #include <linux/slab.h>
20
21
22 enum {
23 MSM6242_SECOND1 = 0x0,
24 MSM6242_SECOND10 = 0x1,
25 MSM6242_MINUTE1 = 0x2,
26 MSM6242_MINUTE10 = 0x3,
27 MSM6242_HOUR1 = 0x4,
28 MSM6242_HOUR10 = 0x5,
29 MSM6242_DAY1 = 0x6,
30 MSM6242_DAY10 = 0x7,
31 MSM6242_MONTH1 = 0x8,
32 MSM6242_MONTH10 = 0x9,
33 MSM6242_YEAR1 = 0xa,
34 MSM6242_YEAR10 = 0xb,
35 MSM6242_WEEK = 0xc,
36 MSM6242_CD = 0xd,
37 MSM6242_CE = 0xe,
38 MSM6242_CF = 0xf,
39 };
40
41 #define MSM6242_HOUR10_AM (0 << 2)
42 #define MSM6242_HOUR10_PM (1 << 2)
43 #define MSM6242_HOUR10_HR_MASK (3 << 0)
44
45 #define MSM6242_WEEK_SUNDAY 0
46 #define MSM6242_WEEK_MONDAY 1
47 #define MSM6242_WEEK_TUESDAY 2
48 #define MSM6242_WEEK_WEDNESDAY 3
49 #define MSM6242_WEEK_THURSDAY 4
50 #define MSM6242_WEEK_FRIDAY 5
51 #define MSM6242_WEEK_SATURDAY 6
52
53 #define MSM6242_CD_30_S_ADJ (1 << 3)
54 #define MSM6242_CD_IRQ_FLAG (1 << 2)
55 #define MSM6242_CD_BUSY (1 << 1)
56 #define MSM6242_CD_HOLD (1 << 0)
57
58 #define MSM6242_CE_T_MASK (3 << 2)
59 #define MSM6242_CE_T_64HZ (0 << 2)
60 #define MSM6242_CE_T_1HZ (1 << 2)
61 #define MSM6242_CE_T_1MINUTE (2 << 2)
62 #define MSM6242_CE_T_1HOUR (3 << 2)
63
64 #define MSM6242_CE_ITRPT_STND (1 << 1)
65 #define MSM6242_CE_MASK (1 << 0)
66
67 #define MSM6242_CF_TEST (1 << 3)
68 #define MSM6242_CF_12H (0 << 2)
69 #define MSM6242_CF_24H (1 << 2)
70 #define MSM6242_CF_STOP (1 << 1)
71 #define MSM6242_CF_REST (1 << 0)
72
73
74 struct msm6242_priv {
75 u32 __iomem *regs;
76 struct rtc_device *rtc;
77 };
78
79 static inline unsigned int msm6242_read(struct msm6242_priv *priv,
80 unsigned int reg)
81 {
82 return __raw_readl(&priv->regs[reg]) & 0xf;
83 }
84
85 static inline void msm6242_write(struct msm6242_priv *priv, unsigned int val,
86 unsigned int reg)
87 {
88 __raw_writel(val, &priv->regs[reg]);
89 }
90
91 static inline void msm6242_set(struct msm6242_priv *priv, unsigned int val,
92 unsigned int reg)
93 {
94 msm6242_write(priv, msm6242_read(priv, reg) | val, reg);
95 }
96
97 static inline void msm6242_clear(struct msm6242_priv *priv, unsigned int val,
98 unsigned int reg)
99 {
100 msm6242_write(priv, msm6242_read(priv, reg) & ~val, reg);
101 }
102
103 static void msm6242_lock(struct msm6242_priv *priv)
104 {
105 int cnt = 5;
106
107 msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
108
109 while ((msm6242_read(priv, MSM6242_CD) & MSM6242_CD_BUSY) && cnt) {
110 msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
111 udelay(70);
112 msm6242_set(priv, MSM6242_CD_HOLD, MSM6242_CD);
113 cnt--;
114 }
115
116 if (!cnt)
117 pr_warn("timed out waiting for RTC (0x%x)\n",
118 msm6242_read(priv, MSM6242_CD));
119 }
120
121 static void msm6242_unlock(struct msm6242_priv *priv)
122 {
123 msm6242_clear(priv, MSM6242_CD_HOLD, MSM6242_CD);
124 }
125
126 static int msm6242_read_time(struct device *dev, struct rtc_time *tm)
127 {
128 struct msm6242_priv *priv = dev_get_drvdata(dev);
129
130 msm6242_lock(priv);
131
132 tm->tm_sec = msm6242_read(priv, MSM6242_SECOND10) * 10 +
133 msm6242_read(priv, MSM6242_SECOND1);
134 tm->tm_min = msm6242_read(priv, MSM6242_MINUTE10) * 10 +
135 msm6242_read(priv, MSM6242_MINUTE1);
136 tm->tm_hour = (msm6242_read(priv, MSM6242_HOUR10) &
137 MSM6242_HOUR10_HR_MASK) * 10 +
138 msm6242_read(priv, MSM6242_HOUR1);
139 tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 +
140 msm6242_read(priv, MSM6242_DAY1);
141 tm->tm_wday = msm6242_read(priv, MSM6242_WEEK);
142 tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 +
143 msm6242_read(priv, MSM6242_MONTH1) - 1;
144 tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 +
145 msm6242_read(priv, MSM6242_YEAR1);
146 if (tm->tm_year <= 69)
147 tm->tm_year += 100;
148
149 if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) {
150 unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) &
151 MSM6242_HOUR10_PM;
152 if (!pm && tm->tm_hour == 12)
153 tm->tm_hour = 0;
154 else if (pm && tm->tm_hour != 12)
155 tm->tm_hour += 12;
156 }
157
158 msm6242_unlock(priv);
159
160 return 0;
161 }
162
163 static int msm6242_set_time(struct device *dev, struct rtc_time *tm)
164 {
165 struct msm6242_priv *priv = dev_get_drvdata(dev);
166
167 msm6242_lock(priv);
168
169 msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10);
170 msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1);
171 msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10);
172 msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1);
173 if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)
174 msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
175 else if (tm->tm_hour >= 12)
176 msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10,
177 MSM6242_HOUR10);
178 else
179 msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10);
180 msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1);
181 msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10);
182 msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1);
183 if (tm->tm_wday != -1)
184 msm6242_write(priv, tm->tm_wday, MSM6242_WEEK);
185 msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10);
186 msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1);
187 if (tm->tm_year >= 100)
188 tm->tm_year -= 100;
189 msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10);
190 msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1);
191
192 msm6242_unlock(priv);
193 return 0;
194 }
195
196 static const struct rtc_class_ops msm6242_rtc_ops = {
197 .read_time = msm6242_read_time,
198 .set_time = msm6242_set_time,
199 };
200
201 static int __init msm6242_rtc_probe(struct platform_device *pdev)
202 {
203 struct resource *res;
204 struct msm6242_priv *priv;
205 struct rtc_device *rtc;
206
207 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
208 if (!res)
209 return -ENODEV;
210
211 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
212 if (!priv)
213 return -ENOMEM;
214
215 priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
216 if (!priv->regs)
217 return -ENOMEM;
218 platform_set_drvdata(pdev, priv);
219
220 rtc = devm_rtc_device_register(&pdev->dev, "rtc-msm6242",
221 &msm6242_rtc_ops, THIS_MODULE);
222 if (IS_ERR(rtc))
223 return PTR_ERR(rtc);
224
225 priv->rtc = rtc;
226 return 0;
227 }
228
229 static struct platform_driver msm6242_rtc_driver = {
230 .driver = {
231 .name = "rtc-msm6242",
232 },
233 };
234
235 module_platform_driver_probe(msm6242_rtc_driver, msm6242_rtc_probe);
236
237 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
238 MODULE_LICENSE("GPL");
239 MODULE_DESCRIPTION("Oki MSM6242 RTC driver");
240 MODULE_ALIAS("platform:rtc-msm6242");