Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
98a9bb5b | 2 | /* |
1d61d259 | 3 | * Faraday Technology FTRTC010 driver |
98a9bb5b HUK |
4 | * |
5 | * Copyright (C) 2009 Janos Laube <janos.dev@gmail.com> | |
6 | * | |
98a9bb5b HUK |
7 | * Original code for older kernel 2.6.15 are from Stormlinksemi |
8 | * first update from Janos Laube for > 2.6.29 kernels | |
9 | * | |
10 | * checkpatch fixes and usage of rtc-lib code | |
11 | * Hans Ulli Kroll <ulli.kroll@googlemail.com> | |
12 | */ | |
13 | ||
14 | #include <linux/rtc.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
ac316725 | 20 | #include <linux/mod_devicetable.h> |
ac05fba3 | 21 | #include <linux/clk.h> |
98a9bb5b | 22 | |
1d61d259 | 23 | #define DRV_NAME "rtc-ftrtc010" |
98a9bb5b HUK |
24 | |
25 | MODULE_AUTHOR("Hans Ulli Kroll <ulli.kroll@googlemail.com>"); | |
26 | MODULE_DESCRIPTION("RTC driver for Gemini SoC"); | |
27 | MODULE_LICENSE("GPL"); | |
28 | MODULE_ALIAS("platform:" DRV_NAME); | |
29 | ||
1d61d259 | 30 | struct ftrtc010_rtc { |
98a9bb5b HUK |
31 | struct rtc_device *rtc_dev; |
32 | void __iomem *rtc_base; | |
33 | int rtc_irq; | |
ac05fba3 LW |
34 | struct clk *pclk; |
35 | struct clk *extclk; | |
98a9bb5b HUK |
36 | }; |
37 | ||
1d61d259 LW |
38 | enum ftrtc010_rtc_offsets { |
39 | FTRTC010_RTC_SECOND = 0x00, | |
40 | FTRTC010_RTC_MINUTE = 0x04, | |
41 | FTRTC010_RTC_HOUR = 0x08, | |
42 | FTRTC010_RTC_DAYS = 0x0C, | |
43 | FTRTC010_RTC_ALARM_SECOND = 0x10, | |
44 | FTRTC010_RTC_ALARM_MINUTE = 0x14, | |
45 | FTRTC010_RTC_ALARM_HOUR = 0x18, | |
46 | FTRTC010_RTC_RECORD = 0x1C, | |
47 | FTRTC010_RTC_CR = 0x20, | |
98a9bb5b HUK |
48 | }; |
49 | ||
1d61d259 | 50 | static irqreturn_t ftrtc010_rtc_interrupt(int irq, void *dev) |
98a9bb5b HUK |
51 | { |
52 | return IRQ_HANDLED; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Looks like the RTC in the Gemini SoC is (totaly) broken | |
57 | * We can't read/write directly the time from RTC registers. | |
58 | * We must do some "offset" calculation to get the real time | |
59 | * | |
60 | * This FIX works pretty fine and Stormlinksemi aka Cortina-Networks does | |
61 | * the same thing, without the rtc-lib.c calls. | |
62 | */ | |
63 | ||
1d61d259 | 64 | static int ftrtc010_rtc_read_time(struct device *dev, struct rtc_time *tm) |
98a9bb5b | 65 | { |
1d61d259 | 66 | struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
98a9bb5b | 67 | |
73318f8b AB |
68 | u32 days, hour, min, sec, offset; |
69 | timeu64_t time; | |
98a9bb5b | 70 | |
1d61d259 LW |
71 | sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
72 | min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); | |
73 | hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); | |
74 | days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); | |
75 | offset = readl(rtc->rtc_base + FTRTC010_RTC_RECORD); | |
98a9bb5b HUK |
76 | |
77 | time = offset + days * 86400 + hour * 3600 + min * 60 + sec; | |
78 | ||
73318f8b | 79 | rtc_time64_to_tm(time, tm); |
98a9bb5b HUK |
80 | |
81 | return 0; | |
82 | } | |
83 | ||
1d61d259 | 84 | static int ftrtc010_rtc_set_time(struct device *dev, struct rtc_time *tm) |
98a9bb5b | 85 | { |
1d61d259 | 86 | struct ftrtc010_rtc *rtc = dev_get_drvdata(dev); |
73318f8b AB |
87 | u32 sec, min, hour, day, offset; |
88 | timeu64_t time; | |
98a9bb5b | 89 | |
73318f8b | 90 | time = rtc_tm_to_time64(tm); |
98a9bb5b | 91 | |
1d61d259 LW |
92 | sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
93 | min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); | |
94 | hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); | |
95 | day = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); | |
98a9bb5b HUK |
96 | |
97 | offset = time - (day * 86400 + hour * 3600 + min * 60 + sec); | |
98 | ||
1d61d259 LW |
99 | writel(offset, rtc->rtc_base + FTRTC010_RTC_RECORD); |
100 | writel(0x01, rtc->rtc_base + FTRTC010_RTC_CR); | |
98a9bb5b HUK |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
1d61d259 LW |
105 | static const struct rtc_class_ops ftrtc010_rtc_ops = { |
106 | .read_time = ftrtc010_rtc_read_time, | |
107 | .set_time = ftrtc010_rtc_set_time, | |
98a9bb5b HUK |
108 | }; |
109 | ||
1d61d259 | 110 | static int ftrtc010_rtc_probe(struct platform_device *pdev) |
98a9bb5b | 111 | { |
b8e62b58 | 112 | u32 days, hour, min, sec; |
1d61d259 | 113 | struct ftrtc010_rtc *rtc; |
98a9bb5b HUK |
114 | struct device *dev = &pdev->dev; |
115 | struct resource *res; | |
116 | int ret; | |
117 | ||
118 | rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); | |
119 | if (unlikely(!rtc)) | |
120 | return -ENOMEM; | |
121 | platform_set_drvdata(pdev, rtc); | |
122 | ||
ac05fba3 LW |
123 | rtc->pclk = devm_clk_get(dev, "PCLK"); |
124 | if (IS_ERR(rtc->pclk)) { | |
125 | dev_err(dev, "could not get PCLK\n"); | |
126 | } else { | |
127 | ret = clk_prepare_enable(rtc->pclk); | |
128 | if (ret) { | |
129 | dev_err(dev, "failed to enable PCLK\n"); | |
130 | return ret; | |
131 | } | |
132 | } | |
133 | rtc->extclk = devm_clk_get(dev, "EXTCLK"); | |
134 | if (IS_ERR(rtc->extclk)) { | |
135 | dev_err(dev, "could not get EXTCLK\n"); | |
136 | } else { | |
137 | ret = clk_prepare_enable(rtc->extclk); | |
138 | if (ret) { | |
139 | dev_err(dev, "failed to enable EXTCLK\n"); | |
140 | return ret; | |
141 | } | |
142 | } | |
143 | ||
98a9bb5b HUK |
144 | res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
145 | if (!res) | |
146 | return -ENODEV; | |
147 | ||
148 | rtc->rtc_irq = res->start; | |
149 | ||
150 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
151 | if (!res) | |
152 | return -ENODEV; | |
153 | ||
154 | rtc->rtc_base = devm_ioremap(dev, res->start, | |
45b4c85b | 155 | resource_size(res)); |
332e0d13 PB |
156 | if (!rtc->rtc_base) |
157 | return -ENOMEM; | |
98a9bb5b | 158 | |
e38d161f AB |
159 | rtc->rtc_dev = devm_rtc_allocate_device(dev); |
160 | if (IS_ERR(rtc->rtc_dev)) | |
161 | return PTR_ERR(rtc->rtc_dev); | |
162 | ||
163 | rtc->rtc_dev->ops = &ftrtc010_rtc_ops; | |
164 | ||
b8e62b58 AB |
165 | sec = readl(rtc->rtc_base + FTRTC010_RTC_SECOND); |
166 | min = readl(rtc->rtc_base + FTRTC010_RTC_MINUTE); | |
167 | hour = readl(rtc->rtc_base + FTRTC010_RTC_HOUR); | |
168 | days = readl(rtc->rtc_base + FTRTC010_RTC_DAYS); | |
169 | ||
170 | rtc->rtc_dev->range_min = (u64)days * 86400 + hour * 3600 + | |
171 | min * 60 + sec; | |
172 | rtc->rtc_dev->range_max = U32_MAX + rtc->rtc_dev->range_min; | |
173 | ||
1d61d259 | 174 | ret = devm_request_irq(dev, rtc->rtc_irq, ftrtc010_rtc_interrupt, |
98a9bb5b HUK |
175 | IRQF_SHARED, pdev->name, dev); |
176 | if (unlikely(ret)) | |
177 | return ret; | |
178 | ||
e38d161f | 179 | return rtc_register_device(rtc->rtc_dev); |
98a9bb5b HUK |
180 | } |
181 | ||
1d61d259 | 182 | static int ftrtc010_rtc_remove(struct platform_device *pdev) |
98a9bb5b | 183 | { |
1d61d259 | 184 | struct ftrtc010_rtc *rtc = platform_get_drvdata(pdev); |
98a9bb5b | 185 | |
ac05fba3 LW |
186 | if (!IS_ERR(rtc->extclk)) |
187 | clk_disable_unprepare(rtc->extclk); | |
188 | if (!IS_ERR(rtc->pclk)) | |
189 | clk_disable_unprepare(rtc->pclk); | |
98a9bb5b HUK |
190 | |
191 | return 0; | |
192 | } | |
193 | ||
1d61d259 | 194 | static const struct of_device_id ftrtc010_rtc_dt_match[] = { |
bc7d8ebf | 195 | { .compatible = "cortina,gemini-rtc" }, |
1d61d259 | 196 | { .compatible = "faraday,ftrtc010" }, |
bc7d8ebf LW |
197 | { } |
198 | }; | |
1d61d259 | 199 | MODULE_DEVICE_TABLE(of, ftrtc010_rtc_dt_match); |
bc7d8ebf | 200 | |
1d61d259 | 201 | static struct platform_driver ftrtc010_rtc_driver = { |
98a9bb5b HUK |
202 | .driver = { |
203 | .name = DRV_NAME, | |
1d61d259 | 204 | .of_match_table = ftrtc010_rtc_dt_match, |
98a9bb5b | 205 | }, |
1d61d259 LW |
206 | .probe = ftrtc010_rtc_probe, |
207 | .remove = ftrtc010_rtc_remove, | |
98a9bb5b HUK |
208 | }; |
209 | ||
1d61d259 | 210 | module_platform_driver_probe(ftrtc010_rtc_driver, ftrtc010_rtc_probe); |