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Commit | Line | Data |
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98a9bb5b | 1 | /* |
1d61d259 | 2 | * Faraday Technology FTRTC010 driver |
98a9bb5b HUK |
3 | * |
4 | * Copyright (C) 2009 Janos Laube <janos.dev@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * Original code for older kernel 2.6.15 are from Stormlinksemi | |
17 | * first update from Janos Laube for > 2.6.29 kernels | |
18 | * | |
19 | * checkpatch fixes and usage of rtc-lib code | |
20 | * Hans Ulli Kroll <ulli.kroll@googlemail.com> | |
21 | */ | |
22 | ||
23 | #include <linux/rtc.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
ac05fba3 | 29 | #include <linux/clk.h> |
98a9bb5b | 30 | |
1d61d259 | 31 | #define DRV_NAME "rtc-ftrtc010" |
98a9bb5b HUK |
32 | |
33 | MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>"); | |
34 | MODULE_DESCRIPTION("RTC driver for Gemini SoC"); | |
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_ALIAS("platform:" DRV_NAME); | |
37 | ||
1d61d259 | 38 | struct ftrtc010_rtc { |
98a9bb5b HUK |
39 | struct rtc_device *rtc_dev; |
40 | void __iomem *rtc_base; | |
41 | int rtc_irq; | |
ac05fba3 LW |
42 | struct clk *pclk; |
43 | struct clk *extclk; | |
98a9bb5b HUK |
44 | }; |
45 | ||
1d61d259 LW |
46 | enum ftrtc010_rtc_offsets { |
47 | FTRTC010_RTC_SECOND = 0x00, | |
48 | FTRTC010_RTC_MINUTE = 0x04, | |
49 | FTRTC010_RTC_HOUR = 0x08, | |
50 | FTRTC010_RTC_DAYS = 0x0C, | |
51 | FTRTC010_RTC_ALARM_SECOND = 0x10, | |
52 | FTRTC010_RTC_ALARM_MINUTE = 0x14, | |
53 | FTRTC010_RTC_ALARM_HOUR = 0x18, | |
54 | FTRTC010_RTC_RECORD = 0x1C, | |
55 | FTRTC010_RTC_CR = 0x20, | |
98a9bb5b HUK |
56 | }; |
57 | ||
1d61d259 | 58 | static irqreturn_t ftrtc010_rtc_interrupt(int irq, void *dev) |
98a9bb5b HUK |
59 | { |
60 | return IRQ_HANDLED; | |
61 | } | |
62 | ||
63 | /* | |
64 | * Looks like the RTC in the Gemini SoC is (totaly) broken | |
65 | * We can't read/write directly the time from RTC registers. | |
66 | * We must do some "offset" calculation to get the real time | |
67 | * | |
68 | * This FIX works pretty fine and Stormlinksemi aka Cortina-Networks does | |
69 | * the same thing, without the rtc-lib.c calls. | |
70 | */ | |
71 | ||
1d61d259 | 72 | static int ftrtc010_rtc_read_time(struct device *dev, struct rtc_time *tm) |
98a9bb5b | 73 | { |
1d61d259 | 74 | struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
98a9bb5b HUK |
75 | |
76 | unsigned int days, hour, min, sec; | |
77 | unsigned long offset, time; | |
78 | ||
1d61d259 LW |
79 | sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
80 | min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); | |
81 | hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); | |
82 | days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); | |
83 | offset = readl(rtc->rtc_base + FTRTC010_RTC_RECORD); | |
98a9bb5b HUK |
84 | |
85 | time = offset + days * 86400 + hour * 3600 + min * 60 + sec; | |
86 | ||
87 | rtc_time_to_tm(time, tm); | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
1d61d259 | 92 | static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm) |
98a9bb5b | 93 | { |
1d61d259 | 94 | struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
98a9bb5b HUK |
95 | unsigned int sec, min, hour, day; |
96 | unsigned long offset, time; | |
97 | ||
98 | if (tm->tm_year >= 2148) /* EPOCH Year + 179 */ | |
99 | return -EINVAL; | |
100 | ||
101 | rtc_tm_to_time(tm, &time); | |
102 | ||
1d61d259 LW |
103 | sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
104 | min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); | |
105 | hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); | |
106 | day = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); | |
98a9bb5b HUK |
107 | |
108 | offset = time - (day * 86400 + hour * 3600 + min * 60 + sec); | |
109 | ||
1d61d259 LW |
110 | writel(offset, rtc->rtc_base + FTRTC010_RTC_RECORD); |
111 | writel(0x01, rtc->rtc_base + FTRTC010_RTC_CR); | |
98a9bb5b HUK |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
1d61d259 LW |
116 | static const struct rtc_class_ops ftrtc010_rtc_ops = { |
117 | .read_time = ftrtc010_rtc_read_time, | |
118 | .set_time = ftrtc010_rtc_set_time, | |
98a9bb5b HUK |
119 | }; |
120 | ||
1d61d259 | 121 | static int ftrtc010_rtc_probe(struct platform_device *pdev) |
98a9bb5b | 122 | { |
1d61d259 | 123 | struct ftrtc010_rtc *rtc; |
98a9bb5b HUK |
124 | struct device *dev = &pdev->dev; |
125 | struct resource *res; | |
126 | int ret; | |
127 | ||
128 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); | |
129 | if (unlikely(!rtc)) | |
130 | return -ENOMEM; | |
131 | platform_set_drvdata(pdev, rtc); | |
132 | ||
ac05fba3 LW |
133 | rtc->pclk = devm_clk_get(dev, "PCLK"); |
134 | if (IS_ERR(rtc->pclk)) { | |
135 | dev_err(dev, "could not get PCLK\n"); | |
136 | } else { | |
137 | ret = clk_prepare_enable(rtc->pclk); | |
138 | if (ret) { | |
139 | dev_err(dev, "failed to enable PCLK\n"); | |
140 | return ret; | |
141 | } | |
142 | } | |
143 | rtc->extclk = devm_clk_get(dev, "EXTCLK"); | |
144 | if (IS_ERR(rtc->extclk)) { | |
145 | dev_err(dev, "could not get EXTCLK\n"); | |
146 | } else { | |
147 | ret = clk_prepare_enable(rtc->extclk); | |
148 | if (ret) { | |
149 | dev_err(dev, "failed to enable EXTCLK\n"); | |
150 | return ret; | |
151 | } | |
152 | } | |
153 | ||
98a9bb5b HUK |
154 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
155 | if (!res) | |
156 | return -ENODEV; | |
157 | ||
158 | rtc->rtc_irq = res->start; | |
159 | ||
160 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
161 | if (!res) | |
162 | return -ENODEV; | |
163 | ||
164 | rtc->rtc_base = devm_ioremap(dev, res->start, | |
45b4c85b | 165 | resource_size(res)); |
332e0d13 PB |
166 | if (!rtc->rtc_base) |
167 | return -ENOMEM; | |
98a9bb5b | 168 | |
1d61d259 | 169 | ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt, |
98a9bb5b HUK |
170 | IRQF_SHARED, pdev->name, dev); |
171 | if (unlikely(ret)) | |
172 | return ret; | |
173 | ||
174 | rtc->rtc_dev = rtc_device_register(pdev->name, dev, | |
1d61d259 | 175 | &ftrtc010_rtc_ops, THIS_MODULE); |
202cc98a | 176 | return PTR_ERR_OR_ZERO(rtc->rtc_dev); |
98a9bb5b HUK |
177 | } |
178 | ||
1d61d259 | 179 | static int ftrtc010_rtc_remove(struct platform_device *pdev) |
98a9bb5b | 180 | { |
1d61d259 | 181 | struct ftrtc010_rtc *rtc = platform_get_drvdata(pdev); |
98a9bb5b | 182 | |
ac05fba3 LW |
183 | if (!IS_ERR(rtc->extclk)) |
184 | clk_disable_unprepare(rtc->extclk); | |
185 | if (!IS_ERR(rtc->pclk)) | |
186 | clk_disable_unprepare(rtc->pclk); | |
98a9bb5b | 187 | rtc_device_unregister(rtc->rtc_dev); |
98a9bb5b HUK |
188 | |
189 | return 0; | |
190 | } | |
191 | ||
1d61d259 | 192 | static const struct of_device_id ftrtc010_rtc_dt_match[] = { |
bc7d8ebf | 193 | { .compatible = "cortina,gemini-rtc" }, |
1d61d259 | 194 | { .compatible = "faraday,ftrtc010" }, |
bc7d8ebf LW |
195 | { } |
196 | }; | |
1d61d259 | 197 | MODULE_DEVICE_TABLE(of, ftrtc010_rtc_dt_match); |
bc7d8ebf | 198 | |
1d61d259 | 199 | static struct platform_driver ftrtc010_rtc_driver = { |
98a9bb5b HUK |
200 | .driver = { |
201 | .name = DRV_NAME, | |
1d61d259 | 202 | .of_match_table = ftrtc010_rtc_dt_match, |
98a9bb5b | 203 | }, |
1d61d259 LW |
204 | .probe = ftrtc010_rtc_probe, |
205 | .remove = ftrtc010_rtc_remove, | |
98a9bb5b HUK |
206 | }; |
207 | ||
1d61d259 | 208 | module_platform_driver_probe(ftrtc010_rtc_driver, ftrtc010_rtc_probe); |