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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4f9b9bba GU |
2 | /* |
3 | * Oki MSM6242 RTC Driver | |
4 | * | |
5 | * Copyright 2009 Geert Uytterhoeven | |
6 | * | |
7 | * Based on the A2000 TOD code in arch/m68k/amiga/config.c | |
8 | * Copyright (C) 1993 Hamish Macdonald | |
9 | */ | |
10 | ||
a737e835 JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
4f9b9bba GU |
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> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
4f9b9bba GU |
20 | |
21 | ||
22 | enum { | |
23 | MSM6242_SECOND1 = 0x0, /* 1-second digit register */ | |
24 | MSM6242_SECOND10 = 0x1, /* 10-second digit register */ | |
25 | MSM6242_MINUTE1 = 0x2, /* 1-minute digit register */ | |
26 | MSM6242_MINUTE10 = 0x3, /* 10-minute digit register */ | |
27 | MSM6242_HOUR1 = 0x4, /* 1-hour digit register */ | |
28 | MSM6242_HOUR10 = 0x5, /* PM/AM, 10-hour digit register */ | |
29 | MSM6242_DAY1 = 0x6, /* 1-day digit register */ | |
30 | MSM6242_DAY10 = 0x7, /* 10-day digit register */ | |
31 | MSM6242_MONTH1 = 0x8, /* 1-month digit register */ | |
32 | MSM6242_MONTH10 = 0x9, /* 10-month digit register */ | |
33 | MSM6242_YEAR1 = 0xa, /* 1-year digit register */ | |
34 | MSM6242_YEAR10 = 0xb, /* 10-year digit register */ | |
35 | MSM6242_WEEK = 0xc, /* Week register */ | |
36 | MSM6242_CD = 0xd, /* Control Register D */ | |
37 | MSM6242_CE = 0xe, /* Control Register E */ | |
38 | MSM6242_CF = 0xf, /* Control Register F */ | |
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) /* 30-second adjustment */ | |
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) /* period 1/64 second */ | |
60 | #define MSM6242_CE_T_1HZ (1 << 2) /* period 1 second */ | |
61 | #define MSM6242_CE_T_1MINUTE (2 << 2) /* period 1 minute */ | |
62 | #define MSM6242_CE_T_1HOUR (3 << 2) /* period 1 hour */ | |
63 | ||
64 | #define MSM6242_CE_ITRPT_STND (1 << 1) | |
65 | #define MSM6242_CE_MASK (1 << 0) /* STD.P output control */ | |
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) /* reset */ | |
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 | { | |
d8ce1481 | 88 | __raw_writel(val, &priv->regs[reg]); |
4f9b9bba GU |
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) | |
a737e835 | 117 | pr_warn("timed out waiting for RTC (0x%x)\n", |
2600f715 | 118 | msm6242_read(priv, MSM6242_CD)); |
4f9b9bba GU |
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 & 3)) * 10 + | |
137 | msm6242_read(priv, MSM6242_HOUR1); | |
138 | tm->tm_mday = msm6242_read(priv, MSM6242_DAY10) * 10 + | |
139 | msm6242_read(priv, MSM6242_DAY1); | |
140 | tm->tm_wday = msm6242_read(priv, MSM6242_WEEK); | |
141 | tm->tm_mon = msm6242_read(priv, MSM6242_MONTH10) * 10 + | |
142 | msm6242_read(priv, MSM6242_MONTH1) - 1; | |
143 | tm->tm_year = msm6242_read(priv, MSM6242_YEAR10) * 10 + | |
144 | msm6242_read(priv, MSM6242_YEAR1); | |
145 | if (tm->tm_year <= 69) | |
146 | tm->tm_year += 100; | |
147 | ||
148 | if (!(msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H)) { | |
149 | unsigned int pm = msm6242_read(priv, MSM6242_HOUR10) & | |
150 | MSM6242_HOUR10_PM; | |
151 | if (!pm && tm->tm_hour == 12) | |
152 | tm->tm_hour = 0; | |
153 | else if (pm && tm->tm_hour != 12) | |
154 | tm->tm_hour += 12; | |
155 | } | |
156 | ||
157 | msm6242_unlock(priv); | |
158 | ||
22652ba7 | 159 | return 0; |
4f9b9bba GU |
160 | } |
161 | ||
162 | static int msm6242_set_time(struct device *dev, struct rtc_time *tm) | |
163 | { | |
164 | struct msm6242_priv *priv = dev_get_drvdata(dev); | |
165 | ||
166 | msm6242_lock(priv); | |
167 | ||
168 | msm6242_write(priv, tm->tm_sec / 10, MSM6242_SECOND10); | |
169 | msm6242_write(priv, tm->tm_sec % 10, MSM6242_SECOND1); | |
170 | msm6242_write(priv, tm->tm_min / 10, MSM6242_MINUTE10); | |
171 | msm6242_write(priv, tm->tm_min % 10, MSM6242_MINUTE1); | |
172 | if (msm6242_read(priv, MSM6242_CF) & MSM6242_CF_24H) | |
173 | msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); | |
174 | else if (tm->tm_hour >= 12) | |
175 | msm6242_write(priv, MSM6242_HOUR10_PM + (tm->tm_hour - 12) / 10, | |
176 | MSM6242_HOUR10); | |
177 | else | |
178 | msm6242_write(priv, tm->tm_hour / 10, MSM6242_HOUR10); | |
179 | msm6242_write(priv, tm->tm_hour % 10, MSM6242_HOUR1); | |
180 | msm6242_write(priv, tm->tm_mday / 10, MSM6242_DAY10); | |
181 | msm6242_write(priv, tm->tm_mday % 10, MSM6242_DAY1); | |
182 | if (tm->tm_wday != -1) | |
183 | msm6242_write(priv, tm->tm_wday, MSM6242_WEEK); | |
184 | msm6242_write(priv, (tm->tm_mon + 1) / 10, MSM6242_MONTH10); | |
185 | msm6242_write(priv, (tm->tm_mon + 1) % 10, MSM6242_MONTH1); | |
186 | if (tm->tm_year >= 100) | |
187 | tm->tm_year -= 100; | |
188 | msm6242_write(priv, tm->tm_year / 10, MSM6242_YEAR10); | |
189 | msm6242_write(priv, tm->tm_year % 10, MSM6242_YEAR1); | |
190 | ||
191 | msm6242_unlock(priv); | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static const struct rtc_class_ops msm6242_rtc_ops = { | |
196 | .read_time = msm6242_read_time, | |
197 | .set_time = msm6242_set_time, | |
198 | }; | |
199 | ||
c40dcf6e | 200 | static int __init msm6242_rtc_probe(struct platform_device *pdev) |
4f9b9bba GU |
201 | { |
202 | struct resource *res; | |
203 | struct msm6242_priv *priv; | |
204 | struct rtc_device *rtc; | |
4f9b9bba | 205 | |
c40dcf6e | 206 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
4f9b9bba GU |
207 | if (!res) |
208 | return -ENODEV; | |
209 | ||
c40dcf6e | 210 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
4f9b9bba GU |
211 | if (!priv) |
212 | return -ENOMEM; | |
213 | ||
c40dcf6e JH |
214 | priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); |
215 | if (!priv->regs) | |
216 | return -ENOMEM; | |
217 | platform_set_drvdata(pdev, priv); | |
4f9b9bba | 218 | |
c40dcf6e JH |
219 | rtc = devm_rtc_device_register(&pdev->dev, "rtc-msm6242", |
220 | &msm6242_rtc_ops, THIS_MODULE); | |
e3aa7526 JH |
221 | if (IS_ERR(rtc)) |
222 | return PTR_ERR(rtc); | |
4f9b9bba GU |
223 | |
224 | priv->rtc = rtc; | |
4f9b9bba | 225 | return 0; |
4f9b9bba GU |
226 | } |
227 | ||
4f9b9bba GU |
228 | static struct platform_driver msm6242_rtc_driver = { |
229 | .driver = { | |
230 | .name = "rtc-msm6242", | |
4f9b9bba | 231 | }, |
4f9b9bba GU |
232 | }; |
233 | ||
19cccfb5 | 234 | module_platform_driver_probe(msm6242_rtc_driver, msm6242_rtc_probe); |
4f9b9bba GU |
235 | |
236 | MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); | |
237 | MODULE_LICENSE("GPL"); | |
238 | MODULE_DESCRIPTION("Oki MSM6242 RTC driver"); | |
239 | MODULE_ALIAS("platform:rtc-msm6242"); |