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1 | /* |
2 | * Ricoh RP5C01 RTC Driver |
3 | * |
4 | * Copyright 2009 Geert Uytterhoeven |
5 | * |
6 | * Based on the A3000 TOD code in arch/m68k/amiga/config.c |
7 | * Copyright (C) 1993 Hamish Macdonald |
8 | */ |
9 | |
10 | #include <linux/io.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> |
13 | #include <linux/platform_device.h> |
14 | #include <linux/rtc.h> |
15 | #include <linux/slab.h> |
16 | |
17 | |
18 | enum { |
19 | RP5C01_1_SECOND = 0x0, /* MODE 00 */ |
20 | RP5C01_10_SECOND = 0x1, /* MODE 00 */ |
21 | RP5C01_1_MINUTE = 0x2, /* MODE 00 and MODE 01 */ |
22 | RP5C01_10_MINUTE = 0x3, /* MODE 00 and MODE 01 */ |
23 | RP5C01_1_HOUR = 0x4, /* MODE 00 and MODE 01 */ |
24 | RP5C01_10_HOUR = 0x5, /* MODE 00 and MODE 01 */ |
25 | RP5C01_DAY_OF_WEEK = 0x6, /* MODE 00 and MODE 01 */ |
26 | RP5C01_1_DAY = 0x7, /* MODE 00 and MODE 01 */ |
27 | RP5C01_10_DAY = 0x8, /* MODE 00 and MODE 01 */ |
28 | RP5C01_1_MONTH = 0x9, /* MODE 00 */ |
29 | RP5C01_10_MONTH = 0xa, /* MODE 00 */ |
30 | RP5C01_1_YEAR = 0xb, /* MODE 00 */ |
31 | RP5C01_10_YEAR = 0xc, /* MODE 00 */ |
32 | |
33 | RP5C01_12_24_SELECT = 0xa, /* MODE 01 */ |
34 | RP5C01_LEAP_YEAR = 0xb, /* MODE 01 */ |
35 | |
36 | RP5C01_MODE = 0xd, /* all modes */ |
37 | RP5C01_TEST = 0xe, /* all modes */ |
38 | RP5C01_RESET = 0xf, /* all modes */ |
39 | }; |
40 | |
41 | #define RP5C01_12_24_SELECT_12 (0 << 0) |
42 | #define RP5C01_12_24_SELECT_24 (1 << 0) |
43 | |
44 | #define RP5C01_10_HOUR_AM (0 << 1) |
45 | #define RP5C01_10_HOUR_PM (1 << 1) |
46 | |
47 | #define RP5C01_MODE_TIMER_EN (1 << 3) /* timer enable */ |
48 | #define RP5C01_MODE_ALARM_EN (1 << 2) /* alarm enable */ |
49 | |
50 | #define RP5C01_MODE_MODE_MASK (3 << 0) |
51 | #define RP5C01_MODE_MODE00 (0 << 0) /* time */ |
52 | #define RP5C01_MODE_MODE01 (1 << 0) /* alarm, 12h/24h, leap year */ |
53 | #define RP5C01_MODE_RAM_BLOCK10 (2 << 0) /* RAM 4 bits x 13 */ |
54 | #define RP5C01_MODE_RAM_BLOCK11 (3 << 0) /* RAM 4 bits x 13 */ |
55 | |
56 | #define RP5C01_RESET_1HZ_PULSE (1 << 3) |
57 | #define RP5C01_RESET_16HZ_PULSE (1 << 2) |
58 | #define RP5C01_RESET_SECOND (1 << 1) /* reset divider stages for */ |
59 | /* seconds or smaller units */ |
60 | #define RP5C01_RESET_ALARM (1 << 0) /* reset all alarm registers */ |
61 | |
62 | |
63 | struct rp5c01_priv { |
64 | u32 __iomem *regs; |
65 | struct rtc_device *rtc; |
66 | }; |
67 | |
68 | static inline unsigned int rp5c01_read(struct rp5c01_priv *priv, |
69 | unsigned int reg) |
70 | { |
71 | return __raw_readl(&priv->regs[reg]) & 0xf; |
72 | } |
73 | |
74 | static inline void rp5c01_write(struct rp5c01_priv *priv, unsigned int val, |
75 | unsigned int reg) |
76 | { |
77 | return __raw_writel(val, &priv->regs[reg]); |
78 | } |
79 | |
80 | static void rp5c01_lock(struct rp5c01_priv *priv) |
81 | { |
82 | rp5c01_write(priv, RP5C01_MODE_MODE00, RP5C01_MODE); |
83 | } |
84 | |
85 | static void rp5c01_unlock(struct rp5c01_priv *priv) |
86 | { |
87 | rp5c01_write(priv, RP5C01_MODE_TIMER_EN | RP5C01_MODE_MODE01, |
88 | RP5C01_MODE); |
89 | } |
90 | |
91 | static int rp5c01_read_time(struct device *dev, struct rtc_time *tm) |
92 | { |
93 | struct rp5c01_priv *priv = dev_get_drvdata(dev); |
94 | |
95 | rp5c01_lock(priv); |
96 | |
97 | tm->tm_sec = rp5c01_read(priv, RP5C01_10_SECOND) * 10 + |
98 | rp5c01_read(priv, RP5C01_1_SECOND); |
99 | tm->tm_min = rp5c01_read(priv, RP5C01_10_MINUTE) * 10 + |
100 | rp5c01_read(priv, RP5C01_1_MINUTE); |
101 | tm->tm_hour = rp5c01_read(priv, RP5C01_10_HOUR) * 10 + |
102 | rp5c01_read(priv, RP5C01_1_HOUR); |
103 | tm->tm_mday = rp5c01_read(priv, RP5C01_10_DAY) * 10 + |
104 | rp5c01_read(priv, RP5C01_1_DAY); |
105 | tm->tm_wday = rp5c01_read(priv, RP5C01_DAY_OF_WEEK); |
106 | tm->tm_mon = rp5c01_read(priv, RP5C01_10_MONTH) * 10 + |
107 | rp5c01_read(priv, RP5C01_1_MONTH) - 1; |
108 | tm->tm_year = rp5c01_read(priv, RP5C01_10_YEAR) * 10 + |
109 | rp5c01_read(priv, RP5C01_1_YEAR); |
110 | if (tm->tm_year <= 69) |
111 | tm->tm_year += 100; |
112 | |
113 | rp5c01_unlock(priv); |
114 | |
115 | return rtc_valid_tm(tm); |
116 | } |
117 | |
118 | static int rp5c01_set_time(struct device *dev, struct rtc_time *tm) |
119 | { |
120 | struct rp5c01_priv *priv = dev_get_drvdata(dev); |
121 | |
122 | rp5c01_lock(priv); |
123 | |
124 | rp5c01_write(priv, tm->tm_sec / 10, RP5C01_10_SECOND); |
125 | rp5c01_write(priv, tm->tm_sec % 10, RP5C01_1_SECOND); |
126 | rp5c01_write(priv, tm->tm_min / 10, RP5C01_10_MINUTE); |
127 | rp5c01_write(priv, tm->tm_min % 10, RP5C01_1_MINUTE); |
128 | rp5c01_write(priv, tm->tm_hour / 10, RP5C01_10_HOUR); |
129 | rp5c01_write(priv, tm->tm_hour % 10, RP5C01_1_HOUR); |
130 | rp5c01_write(priv, tm->tm_mday / 10, RP5C01_10_DAY); |
131 | rp5c01_write(priv, tm->tm_mday % 10, RP5C01_1_DAY); |
132 | if (tm->tm_wday != -1) |
133 | rp5c01_write(priv, tm->tm_wday, RP5C01_DAY_OF_WEEK); |
134 | rp5c01_write(priv, (tm->tm_mon + 1) / 10, RP5C01_10_MONTH); |
135 | rp5c01_write(priv, (tm->tm_mon + 1) % 10, RP5C01_1_MONTH); |
136 | if (tm->tm_year >= 100) |
137 | tm->tm_year -= 100; |
138 | rp5c01_write(priv, tm->tm_year / 10, RP5C01_10_YEAR); |
139 | rp5c01_write(priv, tm->tm_year % 10, RP5C01_1_YEAR); |
140 | |
141 | rp5c01_unlock(priv); |
142 | return 0; |
143 | } |
144 | |
145 | static const struct rtc_class_ops rp5c01_rtc_ops = { |
146 | .read_time = rp5c01_read_time, |
147 | .set_time = rp5c01_set_time, |
148 | }; |
149 | |
150 | static int __init rp5c01_rtc_probe(struct platform_device *dev) |
151 | { |
152 | struct resource *res; |
153 | struct rp5c01_priv *priv; |
154 | struct rtc_device *rtc; |
155 | int error; |
156 | |
157 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
158 | if (!res) |
159 | return -ENODEV; |
160 | |
161 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
162 | if (!priv) |
163 | return -ENOMEM; |
164 | |
165 | priv->regs = ioremap(res->start, resource_size(res)); |
166 | if (!priv->regs) { |
167 | error = -ENOMEM; |
168 | goto out_free_priv; |
169 | } |
170 | |
171 | rtc = rtc_device_register("rtc-rp5c01", &dev->dev, &rp5c01_rtc_ops, |
172 | THIS_MODULE); |
173 | if (IS_ERR(rtc)) { |
174 | error = PTR_ERR(rtc); |
175 | goto out_unmap; |
176 | } |
177 | |
178 | priv->rtc = rtc; |
179 | platform_set_drvdata(dev, priv); |
180 | return 0; |
181 | |
182 | out_unmap: |
183 | iounmap(priv->regs); |
184 | out_free_priv: |
185 | kfree(priv); |
186 | return error; |
187 | } |
188 | |
189 | static int __exit rp5c01_rtc_remove(struct platform_device *dev) |
190 | { |
191 | struct rp5c01_priv *priv = platform_get_drvdata(dev); |
192 | |
193 | rtc_device_unregister(priv->rtc); |
194 | iounmap(priv->regs); |
195 | kfree(priv); |
196 | return 0; |
197 | } |
198 | |
199 | static struct platform_driver rp5c01_rtc_driver = { |
200 | .driver = { |
201 | .name = "rtc-rp5c01", |
202 | .owner = THIS_MODULE, |
203 | }, |
204 | .remove = __exit_p(rp5c01_rtc_remove), |
205 | }; |
206 | |
207 | static int __init rp5c01_rtc_init(void) |
208 | { |
209 | return platform_driver_probe(&rp5c01_rtc_driver, rp5c01_rtc_probe); |
210 | } |
211 | |
212 | static void __exit rp5c01_rtc_fini(void) |
213 | { |
214 | platform_driver_unregister(&rp5c01_rtc_driver); |
215 | } |
216 | |
217 | module_init(rp5c01_rtc_init); |
218 | module_exit(rp5c01_rtc_fini); |
219 | |
220 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); |
221 | MODULE_LICENSE("GPL"); |
222 | MODULE_DESCRIPTION("Ricoh RP5C01 RTC driver"); |
223 | MODULE_ALIAS("platform:rtc-rp5c01"); |
224 |
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