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-rw-r--r--drivers/rtc/rtc-sh.c467
1 files changed, 467 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
new file mode 100644
index 000000000000..d2ce0c8bb8f3
--- /dev/null
+++ b/drivers/rtc/rtc-sh.c
@@ -0,0 +1,467 @@
1/*
2 * SuperH On-Chip RTC Support
3 *
4 * Copyright (C) 2006 Paul Mundt
5 *
6 * Based on the old arch/sh/kernel/cpu/rtc.c by:
7 *
8 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
9 * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License. See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/bcd.h>
18#include <linux/rtc.h>
19#include <linux/init.h>
20#include <linux/platform_device.h>
21#include <linux/seq_file.h>
22#include <linux/interrupt.h>
23#include <linux/spinlock.h>
24#include <asm/io.h>
25
26#ifdef CONFIG_CPU_SH3
27#define rtc_reg_size sizeof(u16)
28#define RTC_BIT_INVERTED 0 /* No bug on SH7708, SH7709A */
29#elif defined(CONFIG_CPU_SH4)
30#define rtc_reg_size sizeof(u32)
31#define RTC_BIT_INVERTED 0x40 /* bug on SH7750, SH7750S */
32#endif
33
34#define RTC_REG(r) ((r) * rtc_reg_size)
35
36#define R64CNT RTC_REG(0)
37#define RSECCNT RTC_REG(1)
38#define RMINCNT RTC_REG(2)
39#define RHRCNT RTC_REG(3)
40#define RWKCNT RTC_REG(4)
41#define RDAYCNT RTC_REG(5)
42#define RMONCNT RTC_REG(6)
43#define RYRCNT RTC_REG(7)
44#define RSECAR RTC_REG(8)
45#define RMINAR RTC_REG(9)
46#define RHRAR RTC_REG(10)
47#define RWKAR RTC_REG(11)
48#define RDAYAR RTC_REG(12)
49#define RMONAR RTC_REG(13)
50#define RCR1 RTC_REG(14)
51#define RCR2 RTC_REG(15)
52
53/* RCR1 Bits */
54#define RCR1_CF 0x80 /* Carry Flag */
55#define RCR1_CIE 0x10 /* Carry Interrupt Enable */
56#define RCR1_AIE 0x08 /* Alarm Interrupt Enable */
57#define RCR1_AF 0x01 /* Alarm Flag */
58
59/* RCR2 Bits */
60#define RCR2_PEF 0x80 /* PEriodic interrupt Flag */
61#define RCR2_PESMASK 0x70 /* Periodic interrupt Set */
62#define RCR2_RTCEN 0x08 /* ENable RTC */
63#define RCR2_ADJ 0x04 /* ADJustment (30-second) */
64#define RCR2_RESET 0x02 /* Reset bit */
65#define RCR2_START 0x01 /* Start bit */
66
67struct sh_rtc {
68 void __iomem *regbase;
69 unsigned long regsize;
70 struct resource *res;
71 unsigned int alarm_irq, periodic_irq, carry_irq;
72 struct rtc_device *rtc_dev;
73 spinlock_t lock;
74};
75
76static irqreturn_t sh_rtc_interrupt(int irq, void *id, struct pt_regs *regs)
77{
78 struct platform_device *pdev = id;
79 struct sh_rtc *rtc = platform_get_drvdata(pdev);
80 unsigned int tmp, events = 0;
81
82 spin_lock(&rtc->lock);
83
84 tmp = readb(rtc->regbase + RCR1);
85
86 if (tmp & RCR1_AF)
87 events |= RTC_AF | RTC_IRQF;
88
89 tmp &= ~(RCR1_CF | RCR1_AF);
90
91 writeb(tmp, rtc->regbase + RCR1);
92
93 rtc_update_irq(&rtc->rtc_dev->class_dev, 1, events);
94
95 spin_unlock(&rtc->lock);
96
97 return IRQ_HANDLED;
98}
99
100static irqreturn_t sh_rtc_periodic(int irq, void *id, struct pt_regs *regs)
101{
102 struct sh_rtc *rtc = dev_get_drvdata(id);
103
104 spin_lock(&rtc->lock);
105
106 rtc_update_irq(&rtc->rtc_dev->class_dev, 1, RTC_PF | RTC_IRQF);
107
108 spin_unlock(&rtc->lock);
109
110 return IRQ_HANDLED;
111}
112
113static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
114{
115 struct sh_rtc *rtc = dev_get_drvdata(dev);
116 unsigned int tmp;
117
118 spin_lock_irq(&rtc->lock);
119
120 tmp = readb(rtc->regbase + RCR2);
121
122 if (enable) {
123 tmp &= ~RCR2_PESMASK;
124 tmp |= RCR2_PEF | (2 << 4);
125 } else
126 tmp &= ~(RCR2_PESMASK | RCR2_PEF);
127
128 writeb(tmp, rtc->regbase + RCR2);
129
130 spin_unlock_irq(&rtc->lock);
131}
132
133static inline void sh_rtc_setaie(struct device *dev, unsigned int enable)
134{
135 struct sh_rtc *rtc = dev_get_drvdata(dev);
136 unsigned int tmp;
137
138 spin_lock_irq(&rtc->lock);
139
140 tmp = readb(rtc->regbase + RCR1);
141
142 if (enable)
143 tmp |= RCR1_AIE;
144 else
145 tmp &= ~RCR1_AIE;
146
147 writeb(tmp, rtc->regbase + RCR1);
148
149 spin_unlock_irq(&rtc->lock);
150}
151
152static int sh_rtc_open(struct device *dev)
153{
154 struct sh_rtc *rtc = dev_get_drvdata(dev);
155 unsigned int tmp;
156 int ret;
157
158 tmp = readb(rtc->regbase + RCR1);
159 tmp &= ~RCR1_CF;
160 tmp |= RCR1_CIE;
161 writeb(tmp, rtc->regbase + RCR1);
162
163 ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, SA_INTERRUPT,
164 "sh-rtc period", dev);
165 if (unlikely(ret)) {
166 dev_err(dev, "request period IRQ failed with %d, IRQ %d\n",
167 ret, rtc->periodic_irq);
168 return ret;
169 }
170
171 ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, SA_INTERRUPT,
172 "sh-rtc carry", dev);
173 if (unlikely(ret)) {
174 dev_err(dev, "request carry IRQ failed with %d, IRQ %d\n",
175 ret, rtc->carry_irq);
176 free_irq(rtc->periodic_irq, dev);
177 goto err_bad_carry;
178 }
179
180 ret = request_irq(rtc->alarm_irq, sh_rtc_interrupt, SA_INTERRUPT,
181 "sh-rtc alarm", dev);
182 if (unlikely(ret)) {
183 dev_err(dev, "request alarm IRQ failed with %d, IRQ %d\n",
184 ret, rtc->alarm_irq);
185 goto err_bad_alarm;
186 }
187
188 return 0;
189
190err_bad_alarm:
191 free_irq(rtc->carry_irq, dev);
192err_bad_carry:
193 free_irq(rtc->periodic_irq, dev);
194
195 return ret;
196}
197
198static void sh_rtc_release(struct device *dev)
199{
200 struct sh_rtc *rtc = dev_get_drvdata(dev);
201
202 sh_rtc_setpie(dev, 0);
203
204 free_irq(rtc->periodic_irq, dev);
205 free_irq(rtc->carry_irq, dev);
206 free_irq(rtc->alarm_irq, dev);
207}
208
209static int sh_rtc_proc(struct device *dev, struct seq_file *seq)
210{
211 struct sh_rtc *rtc = dev_get_drvdata(dev);
212 unsigned int tmp;
213
214 tmp = readb(rtc->regbase + RCR1);
215 seq_printf(seq, "alarm_IRQ\t: %s\n",
216 (tmp & RCR1_AIE) ? "yes" : "no");
217 seq_printf(seq, "carry_IRQ\t: %s\n",
218 (tmp & RCR1_CIE) ? "yes" : "no");
219
220 tmp = readb(rtc->regbase + RCR2);
221 seq_printf(seq, "periodic_IRQ\t: %s\n",
222 (tmp & RCR2_PEF) ? "yes" : "no");
223
224 return 0;
225}
226
227static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
228{
229 unsigned int ret = -ENOIOCTLCMD;
230
231 switch (cmd) {
232 case RTC_PIE_OFF:
233 case RTC_PIE_ON:
234 sh_rtc_setpie(dev, cmd == RTC_PIE_ON);
235 ret = 0;
236 break;
237 case RTC_AIE_OFF:
238 case RTC_AIE_ON:
239 sh_rtc_setaie(dev, cmd == RTC_AIE_ON);
240 ret = 0;
241 break;
242 }
243
244 return ret;
245}
246
247static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm)
248{
249 struct platform_device *pdev = to_platform_device(dev);
250 struct sh_rtc *rtc = platform_get_drvdata(pdev);
251 unsigned int sec128, sec2, yr, yr100, cf_bit;
252
253 do {
254 unsigned int tmp;
255
256 spin_lock_irq(&rtc->lock);
257
258 tmp = readb(rtc->regbase + RCR1);
259 tmp &= ~RCR1_CF; /* Clear CF-bit */
260 tmp |= RCR1_CIE;
261 writeb(tmp, rtc->regbase + RCR1);
262
263 sec128 = readb(rtc->regbase + R64CNT);
264
265 tm->tm_sec = BCD2BIN(readb(rtc->regbase + RSECCNT));
266 tm->tm_min = BCD2BIN(readb(rtc->regbase + RMINCNT));
267 tm->tm_hour = BCD2BIN(readb(rtc->regbase + RHRCNT));
268 tm->tm_wday = BCD2BIN(readb(rtc->regbase + RWKCNT));
269 tm->tm_mday = BCD2BIN(readb(rtc->regbase + RDAYCNT));
270 tm->tm_mon = BCD2BIN(readb(rtc->regbase + RMONCNT));
271
272#if defined(CONFIG_CPU_SH4)
273 yr = readw(rtc->regbase + RYRCNT);
274 yr100 = BCD2BIN(yr >> 8);
275 yr &= 0xff;
276#else
277 yr = readb(rtc->regbase + RYRCNT);
278 yr100 = BCD2BIN((yr == 0x99) ? 0x19 : 0x20);
279#endif
280
281 tm->tm_year = (yr100 * 100 + BCD2BIN(yr)) - 1900;
282
283 sec2 = readb(rtc->regbase + R64CNT);
284 cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF;
285
286 spin_unlock_irq(&rtc->lock);
287 } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0);
288
289#if RTC_BIT_INVERTED != 0
290 if ((sec128 & RTC_BIT_INVERTED))
291 tm->tm_sec--;
292#endif
293
294 dev_dbg(&dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
295 "mday=%d, mon=%d, year=%d, wday=%d\n",
296 __FUNCTION__,
297 tm->tm_sec, tm->tm_min, tm->tm_hour,
298 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
299
300 if (rtc_valid_tm(tm) < 0)
301 dev_err(dev, "invalid date\n");
302
303 return 0;
304}
305
306static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
307{
308 struct platform_device *pdev = to_platform_device(dev);
309 struct sh_rtc *rtc = platform_get_drvdata(pdev);
310 unsigned int tmp;
311 int year;
312
313 spin_lock_irq(&rtc->lock);
314
315 /* Reset pre-scaler & stop RTC */
316 tmp = readb(rtc->regbase + RCR2);
317 tmp |= RCR2_RESET;
318 writeb(tmp, rtc->regbase + RCR2);
319
320 writeb(BIN2BCD(tm->tm_sec), rtc->regbase + RSECCNT);
321 writeb(BIN2BCD(tm->tm_min), rtc->regbase + RMINCNT);
322 writeb(BIN2BCD(tm->tm_hour), rtc->regbase + RHRCNT);
323 writeb(BIN2BCD(tm->tm_wday), rtc->regbase + RWKCNT);
324 writeb(BIN2BCD(tm->tm_mday), rtc->regbase + RDAYCNT);
325 writeb(BIN2BCD(tm->tm_mon), rtc->regbase + RMONCNT);
326
327#ifdef CONFIG_CPU_SH3
328 year = tm->tm_year % 100;
329 writeb(BIN2BCD(year), rtc->regbase + RYRCNT);
330#else
331 year = (BIN2BCD((tm->tm_year + 1900) / 100) << 8) |
332 BIN2BCD(tm->tm_year % 100);
333 writew(year, rtc->regbase + RYRCNT);
334#endif
335
336 /* Start RTC */
337 tmp = readb(rtc->regbase + RCR2);
338 tmp &= ~RCR2_RESET;
339 tmp |= RCR2_RTCEN | RCR2_START;
340 writeb(tmp, rtc->regbase + RCR2);
341
342 spin_unlock_irq(&rtc->lock);
343
344 return 0;
345}
346
347static struct rtc_class_ops sh_rtc_ops = {
348 .open = sh_rtc_open,
349 .release = sh_rtc_release,
350 .ioctl = sh_rtc_ioctl,
351 .read_time = sh_rtc_read_time,
352 .set_time = sh_rtc_set_time,
353 .proc = sh_rtc_proc,
354};
355
356static int __devinit sh_rtc_probe(struct platform_device *pdev)
357{
358 struct sh_rtc *rtc;
359 struct resource *res;
360 int ret = -ENOENT;
361
362 rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
363 if (unlikely(!rtc))
364 return -ENOMEM;
365
366 spin_lock_init(&rtc->lock);
367
368 rtc->periodic_irq = platform_get_irq(pdev, 0);
369 if (unlikely(rtc->periodic_irq < 0)) {
370 dev_err(&pdev->dev, "No IRQ for period\n");
371 goto err_badres;
372 }
373
374 rtc->carry_irq = platform_get_irq(pdev, 1);
375 if (unlikely(rtc->carry_irq < 0)) {
376 dev_err(&pdev->dev, "No IRQ for carry\n");
377 goto err_badres;
378 }
379
380 rtc->alarm_irq = platform_get_irq(pdev, 2);
381 if (unlikely(rtc->alarm_irq < 0)) {
382 dev_err(&pdev->dev, "No IRQ for alarm\n");
383 goto err_badres;
384 }
385
386 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
387 if (unlikely(res == NULL)) {
388 dev_err(&pdev->dev, "No IO resource\n");
389 goto err_badres;
390 }
391
392 rtc->regsize = res->end - res->start + 1;
393
394 rtc->res = request_mem_region(res->start, rtc->regsize, pdev->name);
395 if (unlikely(!rtc->res)) {
396 ret = -EBUSY;
397 goto err_badres;
398 }
399
400 rtc->regbase = (void __iomem *)rtc->res->start;
401 if (unlikely(!rtc->regbase)) {
402 ret = -EINVAL;
403 goto err_badmap;
404 }
405
406 rtc->rtc_dev = rtc_device_register("sh", &pdev->dev,
407 &sh_rtc_ops, THIS_MODULE);
408 if (IS_ERR(rtc)) {
409 ret = PTR_ERR(rtc->rtc_dev);
410 goto err_badmap;
411 }
412
413 platform_set_drvdata(pdev, rtc);
414
415 return 0;
416
417err_badmap:
418 release_resource(rtc->res);
419err_badres:
420 kfree(rtc);
421
422 return ret;
423}
424
425static int __devexit sh_rtc_remove(struct platform_device *pdev)
426{
427 struct sh_rtc *rtc = platform_get_drvdata(pdev);
428
429 if (likely(rtc->rtc_dev))
430 rtc_device_unregister(rtc->rtc_dev);
431
432 sh_rtc_setpie(&pdev->dev, 0);
433 sh_rtc_setaie(&pdev->dev, 0);
434
435 release_resource(rtc->res);
436
437 platform_set_drvdata(pdev, NULL);
438
439 kfree(rtc);
440
441 return 0;
442}
443static struct platform_driver sh_rtc_platform_driver = {
444 .driver = {
445 .name = "sh-rtc",
446 .owner = THIS_MODULE,
447 },
448 .probe = sh_rtc_probe,
449 .remove = __devexit_p(sh_rtc_remove),
450};
451
452static int __init sh_rtc_init(void)
453{
454 return platform_driver_register(&sh_rtc_platform_driver);
455}
456
457static void __exit sh_rtc_exit(void)
458{
459 platform_driver_unregister(&sh_rtc_platform_driver);
460}
461
462module_init(sh_rtc_init);
463module_exit(sh_rtc_exit);
464
465MODULE_DESCRIPTION("SuperH on-chip RTC driver");
466MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
467MODULE_LICENSE("GPL");
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