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23#include <linux/device.h>
24#include <linux/err.h>
25#include <linux/init.h>
26#include <linux/irq.h>
27#include <linux/kernel.h>
28#include <linux/mfd/tps6586x.h>
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/pm_runtime.h>
32#include <linux/rtc.h>
33#include <linux/slab.h>
34
35#define RTC_CTRL 0xc0
36#define POR_RESET_N BIT(7)
37#define OSC_SRC_SEL BIT(6)
38#define RTC_ENABLE BIT(5)
39#define RTC_BUF_ENABLE BIT(4)
40#define PRE_BYPASS BIT(3)
41#define CL_SEL_MASK (BIT(2)|BIT(1))
42#define CL_SEL_POS 1
43#define RTC_ALARM1_HI 0xc1
44#define RTC_COUNT4 0xc6
45
46
47#define RTC_COUNT4_DUMMYREAD 0xc5
48
49
50#define ALM1_VALID_RANGE_IN_SEC 0x3FFF
51
52#define TPS6586X_RTC_CL_SEL_1_5PF 0x0
53#define TPS6586X_RTC_CL_SEL_6_5PF 0x1
54#define TPS6586X_RTC_CL_SEL_7_5PF 0x2
55#define TPS6586X_RTC_CL_SEL_12_5PF 0x3
56
57struct tps6586x_rtc {
58 struct device *dev;
59 struct rtc_device *rtc;
60 int irq;
61 bool irq_en;
62};
63
64static inline struct device *to_tps6586x_dev(struct device *dev)
65{
66 return dev->parent;
67}
68
69static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
70{
71 struct device *tps_dev = to_tps6586x_dev(dev);
72 unsigned long long ticks = 0;
73 time64_t seconds;
74 u8 buff[6];
75 int ret;
76 int i;
77
78 ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(buff), buff);
79 if (ret < 0) {
80 dev_err(dev, "read counter failed with err %d\n", ret);
81 return ret;
82 }
83
84 for (i = 1; i < sizeof(buff); i++) {
85 ticks <<= 8;
86 ticks |= buff[i];
87 }
88
89 seconds = ticks >> 10;
90 rtc_time64_to_tm(seconds, tm);
91
92 return 0;
93}
94
95static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
96{
97 struct device *tps_dev = to_tps6586x_dev(dev);
98 unsigned long long ticks;
99 time64_t seconds;
100 u8 buff[5];
101 int ret;
102
103 seconds = rtc_tm_to_time64(tm);
104
105 ticks = (unsigned long long)seconds << 10;
106 buff[0] = (ticks >> 32) & 0xff;
107 buff[1] = (ticks >> 24) & 0xff;
108 buff[2] = (ticks >> 16) & 0xff;
109 buff[3] = (ticks >> 8) & 0xff;
110 buff[4] = ticks & 0xff;
111
112
113 ret = tps6586x_clr_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
114 if (ret < 0) {
115 dev_err(dev, "failed to clear RTC_ENABLE\n");
116 return ret;
117 }
118
119 ret = tps6586x_writes(tps_dev, RTC_COUNT4, sizeof(buff), buff);
120 if (ret < 0) {
121 dev_err(dev, "failed to program new time\n");
122 return ret;
123 }
124
125
126 ret = tps6586x_set_bits(tps_dev, RTC_CTRL, RTC_ENABLE);
127 if (ret < 0) {
128 dev_err(dev, "failed to set RTC_ENABLE\n");
129 return ret;
130 }
131 return 0;
132}
133
134static int tps6586x_rtc_alarm_irq_enable(struct device *dev,
135 unsigned int enabled)
136{
137 struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
138
139 if (enabled && !rtc->irq_en) {
140 enable_irq(rtc->irq);
141 rtc->irq_en = true;
142 } else if (!enabled && rtc->irq_en) {
143 disable_irq(rtc->irq);
144 rtc->irq_en = false;
145 }
146 return 0;
147}
148
149static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
150{
151 struct device *tps_dev = to_tps6586x_dev(dev);
152 time64_t seconds;
153 unsigned long ticks;
154 unsigned long rtc_current_time;
155 unsigned long long rticks = 0;
156 u8 buff[3];
157 u8 rbuff[6];
158 int ret;
159 int i;
160
161 seconds = rtc_tm_to_time64(&alrm->time);
162
163 ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled);
164 if (ret < 0) {
165 dev_err(dev, "can't set alarm irq, err %d\n", ret);
166 return ret;
167 }
168
169 ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD,
170 sizeof(rbuff), rbuff);
171 if (ret < 0) {
172 dev_err(dev, "read counter failed with err %d\n", ret);
173 return ret;
174 }
175
176 for (i = 1; i < sizeof(rbuff); i++) {
177 rticks <<= 8;
178 rticks |= rbuff[i];
179 }
180
181 rtc_current_time = rticks >> 10;
182 if ((seconds - rtc_current_time) > ALM1_VALID_RANGE_IN_SEC)
183 seconds = rtc_current_time - 1;
184
185 ticks = (unsigned long long)seconds << 10;
186 buff[0] = (ticks >> 16) & 0xff;
187 buff[1] = (ticks >> 8) & 0xff;
188 buff[2] = ticks & 0xff;
189
190 ret = tps6586x_writes(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
191 if (ret)
192 dev_err(dev, "programming alarm failed with err %d\n", ret);
193
194 return ret;
195}
196
197static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
198{
199 struct device *tps_dev = to_tps6586x_dev(dev);
200 unsigned long ticks;
201 time64_t seconds;
202 u8 buff[3];
203 int ret;
204
205 ret = tps6586x_reads(tps_dev, RTC_ALARM1_HI, sizeof(buff), buff);
206 if (ret) {
207 dev_err(dev, "read RTC_ALARM1_HI failed with err %d\n", ret);
208 return ret;
209 }
210
211 ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2];
212 seconds = ticks >> 10;
213
214 rtc_time64_to_tm(seconds, &alrm->time);
215 return 0;
216}
217
218static const struct rtc_class_ops tps6586x_rtc_ops = {
219 .read_time = tps6586x_rtc_read_time,
220 .set_time = tps6586x_rtc_set_time,
221 .set_alarm = tps6586x_rtc_set_alarm,
222 .read_alarm = tps6586x_rtc_read_alarm,
223 .alarm_irq_enable = tps6586x_rtc_alarm_irq_enable,
224};
225
226static irqreturn_t tps6586x_rtc_irq(int irq, void *data)
227{
228 struct tps6586x_rtc *rtc = data;
229
230 rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
231 return IRQ_HANDLED;
232}
233
234static int tps6586x_rtc_probe(struct platform_device *pdev)
235{
236 struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
237 struct tps6586x_rtc *rtc;
238 int ret;
239
240 rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
241 if (!rtc)
242 return -ENOMEM;
243
244 rtc->dev = &pdev->dev;
245 rtc->irq = platform_get_irq(pdev, 0);
246
247
248 ret = tps6586x_update(tps_dev, RTC_CTRL,
249 RTC_ENABLE | OSC_SRC_SEL |
250 ((TPS6586X_RTC_CL_SEL_1_5PF << CL_SEL_POS) & CL_SEL_MASK),
251 RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
252 if (ret < 0) {
253 dev_err(&pdev->dev, "unable to start counter\n");
254 return ret;
255 }
256
257 device_init_wakeup(&pdev->dev, 1);
258
259 platform_set_drvdata(pdev, rtc);
260 rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
261 if (IS_ERR(rtc->rtc)) {
262 ret = PTR_ERR(rtc->rtc);
263 goto fail_rtc_register;
264 }
265
266 rtc->rtc->ops = &tps6586x_rtc_ops;
267 rtc->rtc->range_max = (1ULL << 30) - 1;
268 rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0);
269 rtc->rtc->set_start_time = true;
270
271 irq_set_status_flags(rtc->irq, IRQ_NOAUTOEN);
272
273 ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
274 tps6586x_rtc_irq,
275 IRQF_ONESHOT,
276 dev_name(&pdev->dev), rtc);
277 if (ret < 0) {
278 dev_err(&pdev->dev, "request IRQ(%d) failed with ret %d\n",
279 rtc->irq, ret);
280 goto fail_rtc_register;
281 }
282
283 ret = devm_rtc_register_device(rtc->rtc);
284 if (ret)
285 goto fail_rtc_register;
286
287 return 0;
288
289fail_rtc_register:
290 tps6586x_update(tps_dev, RTC_CTRL, 0,
291 RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
292 return ret;
293};
294
295static int tps6586x_rtc_remove(struct platform_device *pdev)
296{
297 struct device *tps_dev = to_tps6586x_dev(&pdev->dev);
298
299 tps6586x_update(tps_dev, RTC_CTRL, 0,
300 RTC_ENABLE | OSC_SRC_SEL | PRE_BYPASS | CL_SEL_MASK);
301 return 0;
302}
303
304#ifdef CONFIG_PM_SLEEP
305static int tps6586x_rtc_suspend(struct device *dev)
306{
307 struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
308
309 if (device_may_wakeup(dev))
310 enable_irq_wake(rtc->irq);
311 return 0;
312}
313
314static int tps6586x_rtc_resume(struct device *dev)
315{
316 struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
317
318 if (device_may_wakeup(dev))
319 disable_irq_wake(rtc->irq);
320 return 0;
321}
322#endif
323
324static SIMPLE_DEV_PM_OPS(tps6586x_pm_ops, tps6586x_rtc_suspend,
325 tps6586x_rtc_resume);
326
327static struct platform_driver tps6586x_rtc_driver = {
328 .driver = {
329 .name = "tps6586x-rtc",
330 .pm = &tps6586x_pm_ops,
331 },
332 .probe = tps6586x_rtc_probe,
333 .remove = tps6586x_rtc_remove,
334};
335module_platform_driver(tps6586x_rtc_driver);
336
337MODULE_ALIAS("platform:tps6586x-rtc");
338MODULE_DESCRIPTION("TI TPS6586x RTC driver");
339MODULE_AUTHOR("Laxman dewangan <ldewangan@nvidia.com>");
340MODULE_LICENSE("GPL v2");
341
