Root/target/linux/coldfire/patches/027-Add-RTC-driver-support-on-MCF5441x-platform.patch

1From 6462d09dad154b69ea6180c0acb2d009627ff1be Mon Sep 17 00:00:00 2001
2From: Alison Wang <b18965@freescale.com>
3Date: Thu, 4 Aug 2011 09:59:46 +0800
4Subject: [PATCH 27/52] Add RTC driver support on MCF5441x platform
5
6Support on-chip robust-RTC module on MCF5441x platform.
7
8Signed-off-by: Alison Wang <b18965@freescale.com>
9---
10 drivers/rtc/Kconfig | 9 +
11 drivers/rtc/Makefile | 1 +
12 drivers/rtc/rtc-m5441x.c | 638 ++++++++++++++++++++++++++++++++++++++++++++++
13 3 files changed, 648 insertions(+), 0 deletions(-)
14 create mode 100644 drivers/rtc/rtc-m5441x.c
15
16--- a/drivers/rtc/Kconfig
17+++ b/drivers/rtc/Kconfig
18@@ -928,6 +928,15 @@ config RTC_MCF
19 
20       If you build it as a module it will be call mcf-rtc.
21 
22+config RTC_M5441X
23+ tristate "Freescale Coldfire M5441X platform Real Time Clock"
24+ depends on COLDFIRE
25+ help
26+ If you say yes here you will get support for the on-chip Coldfire
27+ Real-Time Clock for mcf5441x platform.
28+
29+ If you build it as a module it will be call rtc-m5441x.
30+
31 config RTC_DRV_PS3
32     tristate "PS3 RTC"
33     depends on PPC_PS3
34--- a/drivers/rtc/Makefile
35+++ b/drivers/rtc/Makefile
36@@ -103,3 +103,4 @@ obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm83
37 obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
38 obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
39 obj-$(CONFIG_RTC_MCF) += rtc-mcf.o
40+obj-$(CONFIG_RTC_M5441X) += rtc-m5441x.o
41--- /dev/null
42+++ b/drivers/rtc/rtc-m5441x.c
43@@ -0,0 +1,638 @@
44+/*
45+ * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
46+ *
47+ * Lanttor.Guo@freescale.com
48+ *
49+ * The code contained herein is licensed under the GNU General Public
50+ * License. You may obtain a copy of the GNU General Public License
51+ * Version 2 or later at the following locations:
52+ *
53+ * http://www.opensource.org/licenses/gpl-license.html
54+ * http://www.gnu.org/copyleft/gpl.html
55+ */
56+
57+/*
58+ * Implementation based on rtc-mcf.c
59+ */
60+
61+/*
62+ * RTC Real Time Clock (RTC) Driver
63+ *
64+ * @file rtc-m5441x.c
65+ * @brief Real Time Clock interface
66+ *
67+ * This file contains Real Time Clock interface for Linux.
68+ *
69+ */
70+#include <linux/rtc.h>
71+#include <linux/module.h>
72+#include <linux/fs.h>
73+#include <linux/init.h>
74+#include <linux/interrupt.h>
75+#include <linux/platform_device.h>
76+#include <linux/clk.h>
77+#include <linux/uaccess.h>
78+#include <asm/mcfsim.h>
79+#include <linux/slab.h>
80+#include <linux/io.h>
81+
82+#ifdef readw
83+#undef readw
84+#endif
85+
86+#ifdef writew
87+#undef writew
88+#endif
89+
90+#define readw(addr) in_be16(addr)
91+#define writew(val, addr) out_be16((addr), (val))
92+
93+
94+#define PIT_ALL_ON (MCF_RTC_ISR_2HZ | MCF_RTC_ISR_SAM0 | MCF_RTC_ISR_SAM1 | \
95+ MCF_RTC_ISR_SAM2 | MCF_RTC_ISR_SAM3 | MCF_RTC_ISR_SAM4 | \
96+ MCF_RTC_ISR_SAM5 | MCF_RTC_ISR_SAM6 | MCF_RTC_ISR_SAM7)
97+
98+#define MAX_PIE_NUM 9
99+#define MAX_PIE_FREQ 512
100+const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
101+ {2, MCF_RTC_ISR_2HZ},
102+ {4, MCF_RTC_ISR_SAM0},
103+ {8, MCF_RTC_ISR_SAM1},
104+ {16, MCF_RTC_ISR_SAM2},
105+ {32, MCF_RTC_ISR_SAM3},
106+ {64, MCF_RTC_ISR_SAM4},
107+ {128, MCF_RTC_ISR_SAM5},
108+ {256, MCF_RTC_ISR_SAM6},
109+ {MAX_PIE_FREQ, MCF_RTC_ISR_SAM7},
110+};
111+
112+/* Those are the bits from a classic RTC we want to mimic */
113+#define RTC_IRQF 0x80 /* any of the following 3 is active */
114+#define RTC_PF 0x40 /* Periodic interrupt */
115+#define RTC_AF 0x20 /* Alarm interrupt */
116+#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
117+
118+#define MCF_RTC_TIME 0
119+#define MCF_RTC_ALARM 1
120+
121+struct rtc_plat_data {
122+ struct rtc_device *rtc;
123+ int irq;
124+ unsigned int irqen;
125+ int alrm_sec;
126+ int alrm_min;
127+ int alrm_hour;
128+ int alrm_mday;
129+};
130+
131+static const int year_cal_basic = 2112;
132+
133+#define RTC_VERSION "0.1"
134+
135+static u32 rtc_freq = 2; /* minimun value for PIE */
136+static unsigned long rtc_status;
137+
138+static struct rtc_time g_rtc_alarm = {
139+ .tm_year = 0,
140+ .tm_mon = 0,
141+ .tm_mday = 0,
142+ .tm_hour = 0,
143+ .tm_mon = 0,
144+ .tm_sec = 0,
145+};
146+
147+static DEFINE_SPINLOCK(rtc_lock);
148+
149+
150+/*
151+ * This funciton is used to disable RTC register write protection
152+ */
153+static void disable_register_write_protection(void)
154+{
155+ if (readw(MCF_RTC_SR) & MCF_RTC_SR_WPE) {
156+ writew(0x0000, MCF_RTC_CR);
157+ writew(0x0001, MCF_RTC_CR);
158+ writew(0x0003, MCF_RTC_CR);
159+ writew(0x0002, MCF_RTC_CR);
160+ }
161+
162+}
163+
164+/*
165+ * This function is used to obtain the RTC time or the alarm value in
166+ * second.
167+ *
168+ * @param time_alarm use MCF_RTC_TIME for RTC time value;
169+ * MCF_RTC_ALARM for alarm value
170+ *
171+ * @return The RTC time or alarm time in second.
172+ */
173+static u32 get_alarm_or_time(struct device *dev, int time_alarm,
174+ struct rtc_time *tm)
175+{
176+ dev_dbg(dev, "debug function %s()!\n", __func__);
177+
178+ if (time_alarm == MCF_RTC_TIME) {
179+ /*check register information */
180+ dev_dbg(dev, "RTC_YEARMON:0x%x,RTC_DAYS:0x%x,RTC_HOURMIN:0x%x,"
181+ "RTC_SECONDS:0x%x\n", readw(MCF_RTC_YEARMON),
182+ readw(MCF_RTC_DAYS), readw(MCF_RTC_HOURMIN),
183+ readw(MCF_RTC_SECONDS));
184+
185+ /* get year */
186+ tm->tm_year = year_cal_basic +
187+ (char)(MCF_RTC_YEARMON_YEAR_RD(readw(MCF_RTC_YEARMON)));
188+ /* get month */
189+ tm->tm_mon =
190+ MCF_RTC_YEARMON_MON_RD(readw(MCF_RTC_YEARMON)) - 1;
191+ /* get month day */
192+ tm->tm_mday = MCF_RTC_DAYS_DAY_RD(readw(MCF_RTC_DAYS));
193+ /* get year day */
194+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
195+ tm->tm_year);
196+ /* year minus 1900 */
197+ tm->tm_year = tm->tm_year - 1900;
198+ /* get week day */
199+ tm->tm_wday = MCF_RTC_DAYS_DAYWEEK_RD(readw(MCF_RTC_DAYS));
200+ /* get hours */
201+ tm->tm_hour =
202+ MCF_RTC_HOURMIN_HOURS_RD(readw(MCF_RTC_HOURMIN));
203+ /* get minutes */
204+ tm->tm_min =
205+ MCF_RTC_HOURMIN_MINUTES_RD(readw(MCF_RTC_HOURMIN));
206+ /* get seconds */
207+ tm->tm_sec =
208+ MCF_RTC_SECONDS_SECONDS_RD(readw(MCF_RTC_SECONDS));
209+ /* no day saving time */
210+ tm->tm_isdst = -1;
211+
212+ /* check rtc_tm fileds information */
213+ dev_dbg(dev, "RTC TIME --> year:%d,yday:%d,mon:%d,mday:%d,"
214+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
215+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
216+ tm->tm_hour, tm->tm_min, tm->tm_sec);
217+
218+ } else if (time_alarm == MCF_RTC_ALARM) {
219+ tm->tm_year = year_cal_basic +
220+ (char)MCF_RTC_YEARMON_YEAR_RD
221+ (readw(MCF_RTC_ALRM_YRMON));
222+ tm->tm_mon =
223+ MCF_RTC_YEARMON_MON_RD(readw(MCF_RTC_ALRM_YRMON)) - 1;
224+ tm->tm_mday = MCF_RTC_DAYS_DAY_RD(readw(MCF_RTC_ALRM_DAYS));
225+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
226+ tm->tm_year);
227+ tm->tm_year = tm->tm_year - 1900;
228+ tm->tm_wday =
229+ MCF_RTC_DAYS_DAYWEEK_RD(readw(MCF_RTC_ALRM_DAYS));
230+ tm->tm_hour =
231+ MCF_RTC_HOURMIN_HOURS_RD(readw(MCF_RTC_ALRM_HM));
232+ tm->tm_min =
233+ MCF_RTC_HOURMIN_MINUTES_RD(readw(MCF_RTC_ALRM_HM));
234+ tm->tm_sec =
235+ MCF_RTC_SECONDS_SECONDS_RD(readw(MCF_RTC_ALRM_SEC));
236+ tm->tm_isdst = -1;
237+
238+ /* debug information */
239+ dev_dbg(dev, "RTC ALARM --> year:%d,yday:%d,mon:%d,mday:%d,"
240+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
241+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
242+ tm->tm_hour, tm->tm_min, tm->tm_sec);
243+
244+ } else {
245+ panic("wrong value for time_alarm=%d\n", time_alarm);
246+ }
247+
248+ return 0;
249+}
250+
251+/*
252+ * This function sets the RTC alarm value or the time value.
253+ *
254+ * @param time_alarm the new alarm value to be updated in the RTC
255+ * @param time use MCF_RTC_TIME for RTC time value;
256+ * MCF_RTC_ALARM for alarm value
257+ */
258+static void set_alarm_or_time(struct device *dev, int time_alarm,
259+ struct rtc_time *tm)
260+{
261+ char year;
262+
263+ dev_dbg(dev, "debug function %s()!\n", __func__);
264+
265+ /* wirte enable setting */
266+ disable_register_write_protection();
267+
268+ if (time_alarm == MCF_RTC_TIME) {
269+ /* check rtc_time fields information */
270+ dev_dbg(dev, "RTC TIME --> year:%d,yday:%d,mon:%d,mday:%d,"
271+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
272+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
273+ tm->tm_hour, tm->tm_min, tm->tm_sec);
274+
275+ year = ((tm->tm_year + 1900) - year_cal_basic);
276+ /* write RTC_YEARMON register */
277+ writew((year << 8) | (tm->tm_mon + 1), MCF_RTC_YEARMON);
278+
279+ /* write RTC_DAYS register */
280+ writew(MCF_RTC_DAYS_DAYWEEK_SET(tm->tm_wday) |
281+ MCF_RTC_DAYS_DAY_SET(tm->tm_mday), MCF_RTC_DAYS);
282+
283+ /* write RTC_HOURMIN register */
284+ writew(MCF_RTC_HOURMIN_HOURS_SET(tm->tm_hour) |
285+ MCF_RTC_HOURMIN_MINUTES_SET(tm->tm_min),
286+ MCF_RTC_HOURMIN);
287+
288+ /* write RTC_SECONDS register */
289+ writew(MCF_RTC_SECONDS_SECONDS_SET
290+ (tm->tm_sec), MCF_RTC_SECONDS);
291+
292+ /* debug information */
293+ dev_dbg(dev, "RTC_YEARMON:0x%x, RTC_DAYS:0x%x, "
294+ "RTC_HOURMIN:0x%x, RTC_SECONDS:0x%x\n",
295+ readw(MCF_RTC_YEARMON), readw(MCF_RTC_DAYS),
296+ readw(MCF_RTC_HOURMIN), readw(MCF_RTC_SECONDS));
297+ } else if (time_alarm == MCF_RTC_ALARM) {
298+
299+ year = ((tm->tm_year + 1900) - year_cal_basic);
300+ /* write RTC_YEARMON register */
301+ writew((year << 8) | (tm->tm_mon + 1), MCF_RTC_ALRM_YRMON);
302+
303+ /* write RTC_DAYS register */
304+ writew(MCF_RTC_DAYS_DAYWEEK_SET(tm->tm_wday) |
305+ MCF_RTC_DAYS_DAY_SET(tm->tm_mday), MCF_RTC_ALRM_DAYS);
306+
307+ /* write RTC_HOURMIN register */
308+ writew(MCF_RTC_HOURMIN_HOURS_SET(tm->tm_hour) |
309+ MCF_RTC_HOURMIN_MINUTES_SET(tm->tm_min),
310+ MCF_RTC_ALRM_HM);
311+
312+ /* write RTC_SECONDS register */
313+ writew(MCF_RTC_SECONDS_SECONDS_SET
314+ (tm->tm_sec), MCF_RTC_ALRM_SEC);
315+
316+ /* debug information */
317+ dev_dbg(dev, "ALRM_YRMON:0x%x,ALRM_DAYS:0x%x,ALRM_HM:0x%x,"
318+ "ALRM_SEC:0x%x\n", readw(MCF_RTC_ALRM_YRMON),
319+ readw(MCF_RTC_ALRM_DAYS), readw(MCF_RTC_ALRM_HM),
320+ readw(MCF_RTC_ALRM_SEC));
321+ } else {
322+ panic("wrong value for time_alarm=%d\n", time_alarm);
323+ }
324+}
325+
326+/*!
327+ * This function updates the RTC alarm registers and then clears all the
328+ * interrupt status bits.
329+ *
330+ * @param alrm the new alarm value to be updated in the RTC
331+ *
332+ * @return 0 if successful; non-zero otherwise.
333+ */
334+static int rtc_update_alarm(struct device *dev, struct rtc_time *alrm)
335+{
336+ /* clear all the interrupt status bits */
337+ disable_register_write_protection();
338+
339+ writew(readw(MCF_RTC_ISR), MCF_RTC_ISR);
340+
341+ set_alarm_or_time(dev, MCF_RTC_ALARM, alrm);
342+
343+ return 0;
344+}
345+
346+/*!
347+ * This function is the RTC interrupt service routine.
348+ *
349+ * @param irq RTC IRQ number
350+ * @param dev_id device ID which is not used
351+ *
352+ * @return IRQ_HANDLED as defined in the include/linux/interrupt.h file.
353+ */
354+static irqreturn_t mcf_rtc_interrupt(int irq, void *dev_id)
355+{
356+ struct platform_device *pdev = dev_id;
357+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
358+ u16 status = 0;
359+ u32 events = 0;
360+
361+ spin_lock(&rtc_lock);
362+
363+ /* clear interrupt sources */
364+ status = readw(MCF_RTC_ISR) & readw(MCF_RTC_IER);
365+
366+ disable_register_write_protection();
367+
368+ writew(status, MCF_RTC_ISR);
369+
370+ /* clear alarm interrupt if it has occurred */
371+ if (status & MCF_RTC_ISR_ALM)
372+ status &= ~MCF_RTC_ISR_ALM;
373+
374+ /* update irq data & counter */
375+ if (status & MCF_RTC_ISR_ALM)
376+ events |= (RTC_AF | RTC_IRQF);
377+ if (status & MCF_RTC_ISR_1HZ)
378+ events |= (RTC_UF | RTC_IRQF);
379+ if (status & PIT_ALL_ON)
380+ events |= (RTC_PF | RTC_IRQF);
381+
382+ if ((status & MCF_RTC_ISR_ALM) && rtc_valid_tm(&g_rtc_alarm))
383+ rtc_update_alarm(&pdev->dev, &g_rtc_alarm);
384+
385+ spin_unlock(&rtc_lock);
386+ rtc_update_irq(pdata->rtc, 1, events);
387+ return IRQ_HANDLED;
388+}
389+
390+/*!
391+ * clear all interrupts and release the IRQ
392+ */
393+static void mcf_rtc_release(struct device *dev)
394+{
395+ spin_lock_irq(&rtc_lock);
396+
397+ disable_register_write_protection();
398+
399+ writew(0, MCF_RTC_IER); /* Disable all rtc interrupts */
400+ writew(readw(MCF_RTC_ISR), MCF_RTC_ISR);
401+ spin_unlock_irq(&rtc_lock);
402+ rtc_status = 0;
403+}
404+
405+/*!
406+ * This function is used to support some ioctl calls directly.
407+ * Other ioctl calls are supported indirectly through the
408+ * arm/common/rtctime.c file.
409+ *
410+ * @param cmd ioctl command as defined in include/linux/rtc.h
411+ * @param arg value for the ioctl command
412+ *
413+ * @return 0 if successful or negative value otherwise.
414+ */
415+static int mcf_rtc_ioctl(struct device *dev, unsigned int cmd,
416+ unsigned long arg)
417+{
418+ int i;
419+
420+ disable_register_write_protection();
421+
422+ switch (cmd) {
423+ case RTC_PIE_OFF:
424+ writew((readw(MCF_RTC_IER) & ~PIT_ALL_ON), MCF_RTC_IER);
425+ return 0;
426+ case RTC_IRQP_SET:
427+ if (arg < 2 || arg > MAX_PIE_FREQ || (arg % 2) != 0)
428+ return -EINVAL; /* Also make sure a power of 2Hz */
429+ if ((arg > 64) && (!capable(CAP_SYS_RESOURCE)))
430+ return -EACCES;
431+ rtc_freq = arg;
432+ return 0;
433+ case RTC_IRQP_READ:
434+ return put_user(rtc_freq, (u32 *) arg);
435+ case RTC_PIE_ON:
436+ for (i = 0; i < MAX_PIE_NUM; i++) {
437+ if (PIE_BIT_DEF[i][0] == rtc_freq)
438+ break;
439+ }
440+ if (i == MAX_PIE_NUM)
441+ return -EACCES;
442+ spin_lock_irq(&rtc_lock);
443+ writew((readw(MCF_RTC_IER) | PIE_BIT_DEF[i][1]), MCF_RTC_IER);
444+ spin_unlock_irq(&rtc_lock);
445+ return 0;
446+ case RTC_AIE_OFF:
447+ spin_lock_irq(&rtc_lock);
448+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM), MCF_RTC_IER);
449+ spin_unlock_irq(&rtc_lock);
450+ return 0;
451+
452+ case RTC_AIE_ON:
453+ spin_lock_irq(&rtc_lock);
454+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_ALM), MCF_RTC_IER);
455+ spin_unlock_irq(&rtc_lock);
456+ return 0;
457+
458+ case RTC_UIE_OFF: /* UIE is for the 1Hz interrupt */
459+ spin_lock_irq(&rtc_lock);
460+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_1HZ), MCF_RTC_IER);
461+ spin_unlock_irq(&rtc_lock);
462+ return 0;
463+
464+ case RTC_UIE_ON:
465+ spin_lock_irq(&rtc_lock);
466+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_1HZ), MCF_RTC_IER);
467+ spin_unlock_irq(&rtc_lock);
468+ return 0;
469+ }
470+ return -ENOIOCTLCMD;
471+}
472+
473+/*!
474+ * This function reads the current RTC time into tm in Gregorian date.
475+ *
476+ * @param tm contains the RTC time value upon return
477+ *
478+ * @return 0 if successful; non-zero otherwise.
479+ */
480+static int mcf_rtc_read_time(struct device *dev, struct rtc_time *tm)
481+{
482+ do {
483+ get_alarm_or_time(dev, MCF_RTC_TIME, tm);
484+ } while (0);
485+
486+ return 0;
487+}
488+
489+/*!
490+ * This function sets the internal RTC time based on tm in Gregorian date.
491+ *
492+ * @param tm the time value to be set in the RTC
493+ *
494+ * @return 0 if successful; non-zero otherwise.
495+ */
496+static int mcf_rtc_set_time(struct device *dev, struct rtc_time *tm)
497+{
498+ do {
499+ set_alarm_or_time(dev, MCF_RTC_TIME, tm);
500+ } while (0);
501+
502+ return 0;
503+}
504+
505+/*!
506+ * This function reads the current alarm value into the passed in \b alrm
507+ * argument. It updates the \b alrm's pending field value based on the whether
508+ * an alarm interrupt occurs or not.
509+ *
510+ * @param alrm contains the RTC alarm value upon return
511+ *
512+ * @return 0 if successful; non-zero otherwise.
513+ */
514+static int mcf_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
515+{
516+ do {
517+ get_alarm_or_time(dev, MCF_RTC_ALARM, &alrm->time);
518+ } while (0);
519+
520+ alrm->pending = ((readw(MCF_RTC_ISR) & MCF_RTC_ISR_ALM) != 0) ? 1 : 0;
521+
522+ return 0;
523+}
524+
525+/*!
526+ * This function sets the RTC alarm based on passed in alrm.
527+ *
528+ * @param alrm the alarm value to be set in the RTC
529+ *
530+ * @return 0 if successful; non-zero otherwise.
531+ */
532+static int mcf_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
533+{
534+ int ret;
535+
536+ spin_lock_irq(&rtc_lock);
537+
538+ disable_register_write_protection();
539+
540+ if (rtc_valid_tm(&alrm->time)) {
541+ if (alrm->time.tm_sec > 59 ||
542+ alrm->time.tm_hour > 23 || alrm->time.tm_min > 59) {
543+ ret = -EINVAL;
544+ goto out;
545+ }
546+ ret = rtc_update_alarm(dev, &alrm->time);
547+ } else {
548+ ret = rtc_valid_tm(&alrm->time);
549+ if (ret)
550+ goto out;
551+ ret = rtc_update_alarm(dev, &alrm->time);
552+ }
553+
554+ if (ret == 0) {
555+ memcpy(&g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));
556+
557+ if (alrm->enabled) {
558+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_ALM),
559+ MCF_RTC_IER);
560+ } else {
561+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM),
562+ MCF_RTC_IER);
563+ }
564+ }
565+out:
566+ spin_unlock_irq(&rtc_lock);
567+
568+ return ret;
569+}
570+
571+/*!
572+ * The RTC driver structure
573+ */
574+static struct rtc_class_ops mcf_rtc_ops = {
575+ .ioctl = mcf_rtc_ioctl,
576+ .read_time = mcf_rtc_read_time,
577+ .set_time = mcf_rtc_set_time,
578+ .read_alarm = mcf_rtc_read_alarm,
579+ .set_alarm = mcf_rtc_set_alarm,
580+};
581+
582+static int __devinit mcf_rtc_probe(struct platform_device *pdev)
583+{
584+ struct rtc_device *rtc;
585+ struct rtc_plat_data *pdata = NULL;
586+ u32 ret = 0;
587+
588+ disable_register_write_protection();
589+ /* Clear interrupt before request irq */
590+ writew(0x0100, MCF_RTC_CR);
591+ writew(0x0001, MCF_RTC_IER);
592+
593+ if (!(readw(MCF_RTC_CFG_DATA) & MCF_RTC_CFG_DATA_OSCEN))
594+ writew(MCF_RTC_CFG_DATA_OSCEN, MCF_RTC_CFG_DATA);
595+
596+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
597+ if (!pdata)
598+ return -ENOMEM;
599+
600+ pdata->irq = MCFINT_VECBASE + MCFINT_RTC;
601+ if (request_irq(pdata->irq, mcf_rtc_interrupt, IRQF_DISABLED,
602+ pdev->name, pdev) < 0) {
603+ dev_warn(&pdev->dev, "interrupt not available.\n");
604+ pdata->irq = -1;
605+ }
606+
607+ if (test_and_set_bit(1, &rtc_status))
608+ return -EBUSY;
609+
610+ rtc = rtc_device_register(pdev->name, &pdev->dev, &mcf_rtc_ops,
611+ THIS_MODULE);
612+ if (IS_ERR(rtc)) {
613+ ret = PTR_ERR(rtc);
614+ if (pdata->irq >= 0)
615+ free_irq(pdata->irq, pdev);
616+ kfree(pdata);
617+ return ret;
618+ }
619+ pdata->rtc = rtc;
620+ platform_set_drvdata(pdev, pdata);
621+
622+ dev_dbg(&pdev->dev, "RTC_CR:0x%x, RTC_SR:0x%x\n", readw(MCF_RTC_CR),
623+ readw(MCF_RTC_SR));
624+
625+ printk(KERN_INFO "Real Time Clock Driver v%s\n", RTC_VERSION);
626+ return ret;
627+}
628+
629+static int __devexit mcf_rtc_remove(struct platform_device *pdev)
630+{
631+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
632+
633+ rtc_device_unregister(pdata->rtc);
634+ if (pdata->irq >= 0)
635+ free_irq(pdata->irq, pdev);
636+ kfree(pdata);
637+ mcf_rtc_release(NULL);
638+ return 0;
639+}
640+
641+/*!
642+ * Contains pointers to the power management callback functions.
643+ */
644+MODULE_ALIAS("rtc-m5441x");
645+static struct platform_driver mcf_rtc_driver = {
646+ .driver = {
647+ .name = "rtc-m5441x",
648+ .owner = THIS_MODULE,
649+ },
650+ .probe = mcf_rtc_probe,
651+ .remove = __devexit_p(mcf_rtc_remove),
652+};
653+
654+/*!
655+ * This function creates the /proc/driver/rtc file and registers the device RTC
656+ * in the /dev/misc directory. It also reads the RTC value from external source
657+ * and setup the internal RTC properly.
658+ *
659+ * @return -1 if RTC is failed to initialize; 0 is successful.
660+ */
661+static int __init mcf_rtc_init(void)
662+{
663+ return platform_driver_register(&mcf_rtc_driver);
664+}
665+
666+/*!
667+ * This function removes the /proc/driver/rtc file and un-registers the
668+ * device RTC from the /dev/misc directory.
669+ */
670+static void __exit mcf_rtc_exit(void)
671+{
672+ platform_driver_unregister(&mcf_rtc_driver);
673+
674+}
675+
676+module_init(mcf_rtc_init);
677+module_exit(mcf_rtc_exit);
678+
679+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
680+MODULE_DESCRIPTION("Real Time Clock Driver (MCF)");
681+MODULE_LICENSE("GPL V2");
682

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