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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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2 | /* |
3 | * Copyright (C) 2016 Oleksij Rempel <linux@rempel-privat.de> | |
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4 | */ |
5 | ||
6 | #include <linux/clk.h> | |
7 | #include <linux/interrupt.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/of.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/rtc.h> | |
13 | ||
14 | /* Miscellaneous registers */ | |
15 | /* Interrupt Location Register */ | |
16 | #define HW_ILR 0x00 | |
17 | #define BM_RTCALF BIT(1) | |
18 | #define BM_RTCCIF BIT(0) | |
19 | ||
20 | /* Clock Control Register */ | |
21 | #define HW_CCR 0x08 | |
22 | /* Calibration counter disable */ | |
23 | #define BM_CCALOFF BIT(4) | |
24 | /* Reset internal oscillator divider */ | |
25 | #define BM_CTCRST BIT(1) | |
26 | /* Clock Enable */ | |
27 | #define BM_CLKEN BIT(0) | |
28 | ||
29 | /* Counter Increment Interrupt Register */ | |
30 | #define HW_CIIR 0x0C | |
31 | #define BM_CIIR_IMYEAR BIT(7) | |
32 | #define BM_CIIR_IMMON BIT(6) | |
33 | #define BM_CIIR_IMDOY BIT(5) | |
34 | #define BM_CIIR_IMDOW BIT(4) | |
35 | #define BM_CIIR_IMDOM BIT(3) | |
36 | #define BM_CIIR_IMHOUR BIT(2) | |
37 | #define BM_CIIR_IMMIN BIT(1) | |
38 | #define BM_CIIR_IMSEC BIT(0) | |
39 | ||
40 | /* Alarm Mask Register */ | |
41 | #define HW_AMR 0x10 | |
42 | #define BM_AMR_IMYEAR BIT(7) | |
43 | #define BM_AMR_IMMON BIT(6) | |
44 | #define BM_AMR_IMDOY BIT(5) | |
45 | #define BM_AMR_IMDOW BIT(4) | |
46 | #define BM_AMR_IMDOM BIT(3) | |
47 | #define BM_AMR_IMHOUR BIT(2) | |
48 | #define BM_AMR_IMMIN BIT(1) | |
49 | #define BM_AMR_IMSEC BIT(0) | |
50 | #define BM_AMR_OFF 0xff | |
51 | ||
52 | /* Consolidated time registers */ | |
53 | #define HW_CTIME0 0x14 | |
54 | #define BM_CTIME0_DOW_S 24 | |
55 | #define BM_CTIME0_DOW_M 0x7 | |
56 | #define BM_CTIME0_HOUR_S 16 | |
57 | #define BM_CTIME0_HOUR_M 0x1f | |
58 | #define BM_CTIME0_MIN_S 8 | |
59 | #define BM_CTIME0_MIN_M 0x3f | |
60 | #define BM_CTIME0_SEC_S 0 | |
61 | #define BM_CTIME0_SEC_M 0x3f | |
62 | ||
63 | #define HW_CTIME1 0x18 | |
64 | #define BM_CTIME1_YEAR_S 16 | |
65 | #define BM_CTIME1_YEAR_M 0xfff | |
66 | #define BM_CTIME1_MON_S 8 | |
67 | #define BM_CTIME1_MON_M 0xf | |
68 | #define BM_CTIME1_DOM_S 0 | |
69 | #define BM_CTIME1_DOM_M 0x1f | |
70 | ||
71 | #define HW_CTIME2 0x1C | |
72 | #define BM_CTIME2_DOY_S 0 | |
73 | #define BM_CTIME2_DOY_M 0xfff | |
74 | ||
75 | /* Time counter registers */ | |
76 | #define HW_SEC 0x20 | |
77 | #define HW_MIN 0x24 | |
78 | #define HW_HOUR 0x28 | |
79 | #define HW_DOM 0x2C | |
80 | #define HW_DOW 0x30 | |
81 | #define HW_DOY 0x34 | |
82 | #define HW_MONTH 0x38 | |
83 | #define HW_YEAR 0x3C | |
84 | ||
85 | #define HW_CALIBRATION 0x40 | |
86 | #define BM_CALDIR_BACK BIT(17) | |
87 | #define BM_CALVAL_M 0x1ffff | |
88 | ||
89 | /* General purpose registers */ | |
90 | #define HW_GPREG0 0x44 | |
91 | #define HW_GPREG1 0x48 | |
92 | #define HW_GPREG2 0x4C | |
93 | #define HW_GPREG3 0x50 | |
94 | #define HW_GPREG4 0x54 | |
95 | ||
96 | /* Alarm register group */ | |
97 | #define HW_ALSEC 0x60 | |
98 | #define HW_ALMIN 0x64 | |
99 | #define HW_ALHOUR 0x68 | |
100 | #define HW_ALDOM 0x6C | |
101 | #define HW_ALDOW 0x70 | |
102 | #define HW_ALDOY 0x74 | |
103 | #define HW_ALMON 0x78 | |
104 | #define HW_ALYEAR 0x7C | |
105 | ||
106 | struct asm9260_rtc_priv { | |
107 | struct device *dev; | |
108 | void __iomem *iobase; | |
109 | struct rtc_device *rtc; | |
110 | struct clk *clk; | |
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111 | }; |
112 | ||
113 | static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id) | |
114 | { | |
115 | struct asm9260_rtc_priv *priv = dev_id; | |
116 | u32 isr; | |
117 | unsigned long events = 0; | |
118 | ||
de75ccdd | 119 | mutex_lock(&priv->rtc->ops_lock); |
125e550f | 120 | isr = ioread32(priv->iobase + HW_CIIR); |
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121 | if (!isr) { |
122 | mutex_unlock(&priv->rtc->ops_lock); | |
125e550f | 123 | return IRQ_NONE; |
de75ccdd | 124 | } |
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125 | |
126 | iowrite32(0, priv->iobase + HW_CIIR); | |
de75ccdd | 127 | mutex_unlock(&priv->rtc->ops_lock); |
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128 | |
129 | events |= RTC_AF | RTC_IRQF; | |
130 | ||
131 | rtc_update_irq(priv->rtc, 1, events); | |
132 | ||
133 | return IRQ_HANDLED; | |
134 | } | |
135 | ||
136 | static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
137 | { | |
138 | struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); | |
139 | u32 ctime0, ctime1, ctime2; | |
125e550f | 140 | |
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141 | ctime0 = ioread32(priv->iobase + HW_CTIME0); |
142 | ctime1 = ioread32(priv->iobase + HW_CTIME1); | |
143 | ctime2 = ioread32(priv->iobase + HW_CTIME2); | |
144 | ||
145 | if (ctime1 != ioread32(priv->iobase + HW_CTIME1)) { | |
146 | /* | |
147 | * woops, counter flipped right now. Now we are safe | |
148 | * to reread. | |
149 | */ | |
150 | ctime0 = ioread32(priv->iobase + HW_CTIME0); | |
151 | ctime1 = ioread32(priv->iobase + HW_CTIME1); | |
152 | ctime2 = ioread32(priv->iobase + HW_CTIME2); | |
153 | } | |
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154 | |
155 | tm->tm_sec = (ctime0 >> BM_CTIME0_SEC_S) & BM_CTIME0_SEC_M; | |
156 | tm->tm_min = (ctime0 >> BM_CTIME0_MIN_S) & BM_CTIME0_MIN_M; | |
157 | tm->tm_hour = (ctime0 >> BM_CTIME0_HOUR_S) & BM_CTIME0_HOUR_M; | |
158 | tm->tm_wday = (ctime0 >> BM_CTIME0_DOW_S) & BM_CTIME0_DOW_M; | |
159 | ||
160 | tm->tm_mday = (ctime1 >> BM_CTIME1_DOM_S) & BM_CTIME1_DOM_M; | |
161 | tm->tm_mon = (ctime1 >> BM_CTIME1_MON_S) & BM_CTIME1_MON_M; | |
162 | tm->tm_year = (ctime1 >> BM_CTIME1_YEAR_S) & BM_CTIME1_YEAR_M; | |
163 | ||
164 | tm->tm_yday = (ctime2 >> BM_CTIME2_DOY_S) & BM_CTIME2_DOY_M; | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
170 | { | |
171 | struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); | |
125e550f | 172 | |
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173 | /* |
174 | * make sure SEC counter will not flip other counter on write time, | |
175 | * real value will be written at the enf of sequence. | |
176 | */ | |
177 | iowrite32(0, priv->iobase + HW_SEC); | |
178 | ||
179 | iowrite32(tm->tm_year, priv->iobase + HW_YEAR); | |
180 | iowrite32(tm->tm_mon, priv->iobase + HW_MONTH); | |
181 | iowrite32(tm->tm_mday, priv->iobase + HW_DOM); | |
182 | iowrite32(tm->tm_wday, priv->iobase + HW_DOW); | |
183 | iowrite32(tm->tm_yday, priv->iobase + HW_DOY); | |
184 | iowrite32(tm->tm_hour, priv->iobase + HW_HOUR); | |
185 | iowrite32(tm->tm_min, priv->iobase + HW_MIN); | |
186 | iowrite32(tm->tm_sec, priv->iobase + HW_SEC); | |
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187 | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
192 | { | |
193 | struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); | |
125e550f | 194 | |
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195 | alrm->time.tm_year = ioread32(priv->iobase + HW_ALYEAR); |
196 | alrm->time.tm_mon = ioread32(priv->iobase + HW_ALMON); | |
197 | alrm->time.tm_mday = ioread32(priv->iobase + HW_ALDOM); | |
198 | alrm->time.tm_wday = ioread32(priv->iobase + HW_ALDOW); | |
199 | alrm->time.tm_yday = ioread32(priv->iobase + HW_ALDOY); | |
200 | alrm->time.tm_hour = ioread32(priv->iobase + HW_ALHOUR); | |
201 | alrm->time.tm_min = ioread32(priv->iobase + HW_ALMIN); | |
202 | alrm->time.tm_sec = ioread32(priv->iobase + HW_ALSEC); | |
203 | ||
204 | alrm->enabled = ioread32(priv->iobase + HW_AMR) ? 1 : 0; | |
205 | alrm->pending = ioread32(priv->iobase + HW_CIIR) ? 1 : 0; | |
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206 | |
207 | return rtc_valid_tm(&alrm->time); | |
208 | } | |
209 | ||
210 | static int asm9260_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
211 | { | |
212 | struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); | |
125e550f | 213 | |
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214 | iowrite32(alrm->time.tm_year, priv->iobase + HW_ALYEAR); |
215 | iowrite32(alrm->time.tm_mon, priv->iobase + HW_ALMON); | |
216 | iowrite32(alrm->time.tm_mday, priv->iobase + HW_ALDOM); | |
217 | iowrite32(alrm->time.tm_wday, priv->iobase + HW_ALDOW); | |
218 | iowrite32(alrm->time.tm_yday, priv->iobase + HW_ALDOY); | |
219 | iowrite32(alrm->time.tm_hour, priv->iobase + HW_ALHOUR); | |
220 | iowrite32(alrm->time.tm_min, priv->iobase + HW_ALMIN); | |
221 | iowrite32(alrm->time.tm_sec, priv->iobase + HW_ALSEC); | |
222 | ||
223 | iowrite32(alrm->enabled ? 0 : BM_AMR_OFF, priv->iobase + HW_AMR); | |
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224 | |
225 | return 0; | |
226 | } | |
227 | ||
228 | static int asm9260_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
229 | { | |
230 | struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); | |
231 | ||
232 | iowrite32(enabled ? 0 : BM_AMR_OFF, priv->iobase + HW_AMR); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | static const struct rtc_class_ops asm9260_rtc_ops = { | |
237 | .read_time = asm9260_rtc_read_time, | |
238 | .set_time = asm9260_rtc_set_time, | |
239 | .read_alarm = asm9260_rtc_read_alarm, | |
240 | .set_alarm = asm9260_rtc_set_alarm, | |
241 | .alarm_irq_enable = asm9260_alarm_irq_enable, | |
242 | }; | |
243 | ||
15c6ea6f | 244 | static int asm9260_rtc_probe(struct platform_device *pdev) |
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245 | { |
246 | struct asm9260_rtc_priv *priv; | |
247 | struct device *dev = &pdev->dev; | |
248 | struct resource *res; | |
249 | int irq_alarm, ret; | |
250 | u32 ccr; | |
251 | ||
252 | priv = devm_kzalloc(dev, sizeof(struct asm9260_rtc_priv), GFP_KERNEL); | |
253 | if (!priv) | |
254 | return -ENOMEM; | |
255 | ||
256 | priv->dev = &pdev->dev; | |
257 | platform_set_drvdata(pdev, priv); | |
258 | ||
259 | irq_alarm = platform_get_irq(pdev, 0); | |
260 | if (irq_alarm < 0) { | |
261 | dev_err(dev, "No alarm IRQ resource defined\n"); | |
262 | return irq_alarm; | |
263 | } | |
264 | ||
265 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
266 | priv->iobase = devm_ioremap_resource(dev, res); | |
267 | if (IS_ERR(priv->iobase)) | |
268 | return PTR_ERR(priv->iobase); | |
269 | ||
270 | priv->clk = devm_clk_get(dev, "ahb"); | |
271 | ret = clk_prepare_enable(priv->clk); | |
272 | if (ret) { | |
273 | dev_err(dev, "Failed to enable clk!\n"); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | ccr = ioread32(priv->iobase + HW_CCR); | |
278 | /* if dev is not enabled, reset it */ | |
279 | if ((ccr & (BM_CLKEN | BM_CTCRST)) != BM_CLKEN) { | |
280 | iowrite32(BM_CTCRST, priv->iobase + HW_CCR); | |
281 | ccr = 0; | |
282 | } | |
283 | ||
284 | iowrite32(BM_CLKEN | ccr, priv->iobase + HW_CCR); | |
285 | iowrite32(0, priv->iobase + HW_CIIR); | |
286 | iowrite32(BM_AMR_OFF, priv->iobase + HW_AMR); | |
287 | ||
288 | priv->rtc = devm_rtc_device_register(dev, dev_name(dev), | |
289 | &asm9260_rtc_ops, THIS_MODULE); | |
290 | if (IS_ERR(priv->rtc)) { | |
291 | ret = PTR_ERR(priv->rtc); | |
292 | dev_err(dev, "Failed to register RTC device: %d\n", ret); | |
293 | goto err_return; | |
294 | } | |
295 | ||
296 | ret = devm_request_threaded_irq(dev, irq_alarm, NULL, | |
297 | asm9260_rtc_irq, IRQF_ONESHOT, | |
298 | dev_name(dev), priv); | |
299 | if (ret < 0) { | |
300 | dev_err(dev, "can't get irq %i, err %d\n", | |
301 | irq_alarm, ret); | |
302 | goto err_return; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | ||
307 | err_return: | |
308 | clk_disable_unprepare(priv->clk); | |
309 | return ret; | |
310 | } | |
311 | ||
15c6ea6f | 312 | static int asm9260_rtc_remove(struct platform_device *pdev) |
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313 | { |
314 | struct asm9260_rtc_priv *priv = platform_get_drvdata(pdev); | |
315 | ||
316 | /* Disable alarm matching */ | |
317 | iowrite32(BM_AMR_OFF, priv->iobase + HW_AMR); | |
318 | clk_disable_unprepare(priv->clk); | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static const struct of_device_id asm9260_dt_ids[] = { | |
323 | { .compatible = "alphascale,asm9260-rtc", }, | |
324 | {} | |
325 | }; | |
aa156c8a | 326 | MODULE_DEVICE_TABLE(of, asm9260_dt_ids); |
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327 | |
328 | static struct platform_driver asm9260_rtc_driver = { | |
329 | .probe = asm9260_rtc_probe, | |
330 | .remove = asm9260_rtc_remove, | |
331 | .driver = { | |
332 | .name = "asm9260-rtc", | |
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333 | .of_match_table = asm9260_dt_ids, |
334 | }, | |
335 | }; | |
336 | ||
337 | module_platform_driver(asm9260_rtc_driver); | |
338 | ||
339 | MODULE_AUTHOR("Oleksij Rempel <linux@rempel-privat.de>"); | |
340 | MODULE_DESCRIPTION("Alphascale asm9260 SoC Realtime Clock Driver (RTC)"); | |
341 | MODULE_LICENSE("GPL"); |