2008-02-06 10:38:59 +01:00
|
|
|
/*
|
|
|
|
* "RTT as Real Time Clock" driver for AT91SAM9 SoC family
|
|
|
|
*
|
|
|
|
* (C) 2007 Michel Benoit
|
|
|
|
*
|
|
|
|
* Based on rtc-at91rm9200.c by Rick Bronson
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public License
|
|
|
|
* as published by the Free Software Foundation; either version
|
|
|
|
* 2 of the License, or (at your option) any later version.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/platform_device.h>
|
|
|
|
#include <linux/time.h>
|
|
|
|
#include <linux/rtc.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/ioctl.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
|
|
|
#include <linux/slab.h>
|
2008-02-06 10:38:59 +01:00
|
|
|
|
2008-08-05 17:14:15 +02:00
|
|
|
#include <mach/board.h>
|
|
|
|
#include <mach/at91_rtt.h>
|
2008-10-22 14:52:08 +02:00
|
|
|
#include <mach/cpu.h>
|
2008-02-06 10:38:59 +01:00
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This driver uses two configurable hardware resources that live in the
|
|
|
|
* AT91SAM9 backup power domain (intended to be powered at all times)
|
|
|
|
* to implement the Real Time Clock interfaces
|
|
|
|
*
|
|
|
|
* - A "Real-time Timer" (RTT) counts up in seconds from a base time.
|
|
|
|
* We can't assign the counter value (CRTV) ... but we can reset it.
|
|
|
|
*
|
|
|
|
* - One of the "General Purpose Backup Registers" (GPBRs) holds the
|
|
|
|
* base time, normally an offset from the beginning of the POSIX
|
|
|
|
* epoch (1970-Jan-1 00:00:00 UTC). Some systems also include the
|
|
|
|
* local timezone's offset.
|
|
|
|
*
|
|
|
|
* The RTC's value is the RTT counter plus that offset. The RTC's alarm
|
|
|
|
* is likewise a base (ALMV) plus that offset.
|
|
|
|
*
|
|
|
|
* Not all RTTs will be used as RTCs; some systems have multiple RTTs to
|
|
|
|
* choose from, or a "real" RTC module. All systems have multiple GPBR
|
|
|
|
* registers available, likewise usable for more than "RTC" support.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We store ALARM_DISABLED in ALMV to record that no alarm is set.
|
|
|
|
* It's also the reset value for that field.
|
|
|
|
*/
|
|
|
|
#define ALARM_DISABLED ((u32)~0)
|
|
|
|
|
|
|
|
|
|
|
|
struct sam9_rtc {
|
|
|
|
void __iomem *rtt;
|
|
|
|
struct rtc_device *rtcdev;
|
|
|
|
u32 imr;
|
2012-02-15 14:24:46 +01:00
|
|
|
void __iomem *gpbr;
|
2012-08-14 11:19:22 +02:00
|
|
|
int irq;
|
2008-02-06 10:38:59 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
#define rtt_readl(rtc, field) \
|
|
|
|
__raw_readl((rtc)->rtt + AT91_RTT_ ## field)
|
|
|
|
#define rtt_writel(rtc, field, val) \
|
|
|
|
__raw_writel((val), (rtc)->rtt + AT91_RTT_ ## field)
|
|
|
|
|
|
|
|
#define gpbr_readl(rtc) \
|
2012-02-15 14:24:46 +01:00
|
|
|
__raw_readl((rtc)->gpbr)
|
2008-02-06 10:38:59 +01:00
|
|
|
#define gpbr_writel(rtc, val) \
|
2012-02-15 14:24:46 +01:00
|
|
|
__raw_writel((val), (rtc)->gpbr)
|
2008-02-06 10:38:59 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Read current time and date in RTC
|
|
|
|
*/
|
|
|
|
static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
u32 secs, secs2;
|
|
|
|
u32 offset;
|
|
|
|
|
|
|
|
/* read current time offset */
|
|
|
|
offset = gpbr_readl(rtc);
|
|
|
|
if (offset == 0)
|
|
|
|
return -EILSEQ;
|
|
|
|
|
|
|
|
/* reread the counter to help sync the two clock domains */
|
|
|
|
secs = rtt_readl(rtc, VR);
|
|
|
|
secs2 = rtt_readl(rtc, VR);
|
|
|
|
if (secs != secs2)
|
|
|
|
secs = rtt_readl(rtc, VR);
|
|
|
|
|
|
|
|
rtc_time_to_tm(offset + secs, tm);
|
|
|
|
|
|
|
|
dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readtime",
|
|
|
|
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
|
|
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set current time and date in RTC
|
|
|
|
*/
|
|
|
|
static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
int err;
|
|
|
|
u32 offset, alarm, mr;
|
|
|
|
unsigned long secs;
|
|
|
|
|
|
|
|
dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "settime",
|
|
|
|
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
|
|
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
|
|
|
|
err = rtc_tm_to_time(tm, &secs);
|
|
|
|
if (err != 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
/* disable interrupts */
|
|
|
|
rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
|
|
|
|
|
|
|
|
/* read current time offset */
|
|
|
|
offset = gpbr_readl(rtc);
|
|
|
|
|
|
|
|
/* store the new base time in a battery backup register */
|
|
|
|
secs += 1;
|
|
|
|
gpbr_writel(rtc, secs);
|
|
|
|
|
|
|
|
/* adjust the alarm time for the new base */
|
|
|
|
alarm = rtt_readl(rtc, AR);
|
|
|
|
if (alarm != ALARM_DISABLED) {
|
|
|
|
if (offset > secs) {
|
|
|
|
/* time jumped backwards, increase time until alarm */
|
|
|
|
alarm += (offset - secs);
|
|
|
|
} else if ((alarm + offset) > secs) {
|
|
|
|
/* time jumped forwards, decrease time until alarm */
|
|
|
|
alarm -= (secs - offset);
|
|
|
|
} else {
|
|
|
|
/* time jumped past the alarm, disable alarm */
|
|
|
|
alarm = ALARM_DISABLED;
|
|
|
|
mr &= ~AT91_RTT_ALMIEN;
|
|
|
|
}
|
|
|
|
rtt_writel(rtc, AR, alarm);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* reset the timer, and re-enable interrupts */
|
|
|
|
rtt_writel(rtc, MR, mr | AT91_RTT_RTTRST);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
struct rtc_time *tm = &alrm->time;
|
|
|
|
u32 alarm = rtt_readl(rtc, AR);
|
|
|
|
u32 offset;
|
|
|
|
|
|
|
|
offset = gpbr_readl(rtc);
|
|
|
|
if (offset == 0)
|
|
|
|
return -EILSEQ;
|
|
|
|
|
2010-03-05 22:44:23 +01:00
|
|
|
memset(alrm, 0, sizeof(*alrm));
|
2008-02-06 10:38:59 +01:00
|
|
|
if (alarm != ALARM_DISABLED && offset != 0) {
|
|
|
|
rtc_time_to_tm(offset + alarm, tm);
|
|
|
|
|
|
|
|
dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readalarm",
|
|
|
|
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
|
|
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
|
|
|
|
|
|
if (rtt_readl(rtc, MR) & AT91_RTT_ALMIEN)
|
|
|
|
alrm->enabled = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
struct rtc_time *tm = &alrm->time;
|
|
|
|
unsigned long secs;
|
|
|
|
u32 offset;
|
|
|
|
u32 mr;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = rtc_tm_to_time(tm, &secs);
|
|
|
|
if (err != 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
offset = gpbr_readl(rtc);
|
|
|
|
if (offset == 0) {
|
|
|
|
/* time is not set */
|
|
|
|
return -EILSEQ;
|
|
|
|
}
|
|
|
|
mr = rtt_readl(rtc, MR);
|
|
|
|
rtt_writel(rtc, MR, mr & ~AT91_RTT_ALMIEN);
|
|
|
|
|
|
|
|
/* alarm in the past? finish and leave disabled */
|
|
|
|
if (secs <= offset) {
|
|
|
|
rtt_writel(rtc, AR, ALARM_DISABLED);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* else set alarm and maybe enable it */
|
|
|
|
rtt_writel(rtc, AR, secs - offset);
|
|
|
|
if (alrm->enabled)
|
|
|
|
rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);
|
|
|
|
|
|
|
|
dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "setalarm",
|
|
|
|
tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour,
|
|
|
|
tm->tm_min, tm->tm_sec);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-02-03 02:02:41 +01:00
|
|
|
static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
u32 mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
dev_dbg(dev, "alarm_irq_enable: enabled=%08x, mr %08x\n", enabled, mr);
|
|
|
|
if (enabled)
|
|
|
|
rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);
|
|
|
|
else
|
|
|
|
rtt_writel(rtc, MR, mr & ~AT91_RTT_ALMIEN);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-02-06 10:38:59 +01:00
|
|
|
/*
|
|
|
|
* Provide additional RTC information in /proc/driver/rtc
|
|
|
|
*/
|
|
|
|
static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
u32 mr = mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
seq_printf(seq, "update_IRQ\t: %s\n",
|
|
|
|
(mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* IRQ handler for the RTC
|
|
|
|
*/
|
|
|
|
static irqreturn_t at91_rtc_interrupt(int irq, void *_rtc)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = _rtc;
|
|
|
|
u32 sr, mr;
|
|
|
|
unsigned long events = 0;
|
|
|
|
|
|
|
|
/* Shared interrupt may be for another device. Note: reading
|
|
|
|
* SR clears it, so we must only read it in this irq handler!
|
|
|
|
*/
|
|
|
|
mr = rtt_readl(rtc, MR) & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
|
2008-03-20 01:01:09 +01:00
|
|
|
sr = rtt_readl(rtc, SR) & (mr >> 16);
|
2008-02-06 10:38:59 +01:00
|
|
|
if (!sr)
|
|
|
|
return IRQ_NONE;
|
|
|
|
|
|
|
|
/* alarm status */
|
|
|
|
if (sr & AT91_RTT_ALMS)
|
|
|
|
events |= (RTC_AF | RTC_IRQF);
|
|
|
|
|
|
|
|
/* timer update/increment */
|
|
|
|
if (sr & AT91_RTT_RTTINC)
|
|
|
|
events |= (RTC_UF | RTC_IRQF);
|
|
|
|
|
|
|
|
rtc_update_irq(rtc->rtcdev, 1, events);
|
|
|
|
|
2008-04-28 11:12:00 +02:00
|
|
|
pr_debug("%s: num=%ld, events=0x%02lx\n", __func__,
|
2008-02-06 10:38:59 +01:00
|
|
|
events >> 8, events & 0x000000FF);
|
|
|
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct rtc_class_ops at91_rtc_ops = {
|
|
|
|
.read_time = at91_rtc_readtime,
|
|
|
|
.set_time = at91_rtc_settime,
|
|
|
|
.read_alarm = at91_rtc_readalarm,
|
|
|
|
.set_alarm = at91_rtc_setalarm,
|
|
|
|
.proc = at91_rtc_proc,
|
2011-02-25 20:13:55 +01:00
|
|
|
.alarm_irq_enable = at91_rtc_alarm_irq_enable,
|
2008-02-06 10:38:59 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize and install RTC driver
|
|
|
|
*/
|
2012-02-15 13:51:37 +01:00
|
|
|
static int __devinit at91_rtc_probe(struct platform_device *pdev)
|
2008-02-06 10:38:59 +01:00
|
|
|
{
|
2012-02-15 14:24:46 +01:00
|
|
|
struct resource *r, *r_gpbr;
|
2008-02-06 10:38:59 +01:00
|
|
|
struct sam9_rtc *rtc;
|
2012-08-14 11:19:22 +02:00
|
|
|
int ret, irq;
|
2008-02-06 10:38:59 +01:00
|
|
|
u32 mr;
|
|
|
|
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
2012-02-15 14:24:46 +01:00
|
|
|
r_gpbr = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
|
|
if (!r || !r_gpbr) {
|
|
|
|
dev_err(&pdev->dev, "need 2 ressources\n");
|
2008-02-06 10:38:59 +01:00
|
|
|
return -ENODEV;
|
2012-02-15 14:24:46 +01:00
|
|
|
}
|
2008-02-06 10:38:59 +01:00
|
|
|
|
2012-08-14 11:19:22 +02:00
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
|
|
if (irq < 0) {
|
|
|
|
dev_err(&pdev->dev, "failed to get interrupt resource\n");
|
|
|
|
return irq;
|
|
|
|
}
|
|
|
|
|
2008-02-06 10:38:59 +01:00
|
|
|
rtc = kzalloc(sizeof *rtc, GFP_KERNEL);
|
|
|
|
if (!rtc)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2012-08-14 11:19:22 +02:00
|
|
|
rtc->irq = irq;
|
|
|
|
|
2008-03-20 01:01:09 +01:00
|
|
|
/* platform setup code should have handled this; sigh */
|
|
|
|
if (!device_can_wakeup(&pdev->dev))
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
|
2008-02-06 10:38:59 +01:00
|
|
|
platform_set_drvdata(pdev, rtc);
|
2011-09-18 04:17:54 +02:00
|
|
|
rtc->rtt = ioremap(r->start, resource_size(r));
|
|
|
|
if (!rtc->rtt) {
|
|
|
|
dev_err(&pdev->dev, "failed to map registers, aborting.\n");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
2008-02-06 10:38:59 +01:00
|
|
|
|
2012-02-15 14:24:46 +01:00
|
|
|
rtc->gpbr = ioremap(r_gpbr->start, resource_size(r_gpbr));
|
|
|
|
if (!rtc->gpbr) {
|
|
|
|
dev_err(&pdev->dev, "failed to map gpbr registers, aborting.\n");
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto fail_gpbr;
|
|
|
|
}
|
|
|
|
|
2008-02-06 10:38:59 +01:00
|
|
|
mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
/* unless RTT is counting at 1 Hz, re-initialize it */
|
|
|
|
if ((mr & AT91_RTT_RTPRES) != AT91_SLOW_CLOCK) {
|
|
|
|
mr = AT91_RTT_RTTRST | (AT91_SLOW_CLOCK & AT91_RTT_RTPRES);
|
|
|
|
gpbr_writel(rtc, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* disable all interrupts (same as on shutdown path) */
|
|
|
|
mr &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
|
|
|
|
rtt_writel(rtc, MR, mr);
|
|
|
|
|
|
|
|
rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
|
|
|
|
&at91_rtc_ops, THIS_MODULE);
|
|
|
|
if (IS_ERR(rtc->rtcdev)) {
|
|
|
|
ret = PTR_ERR(rtc->rtcdev);
|
2011-09-18 04:17:54 +02:00
|
|
|
goto fail_register;
|
2008-02-06 10:38:59 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* register irq handler after we know what name we'll use */
|
2012-08-14 11:19:22 +02:00
|
|
|
ret = request_irq(rtc->irq, at91_rtc_interrupt, IRQF_SHARED,
|
2009-03-25 00:38:22 +01:00
|
|
|
dev_name(&rtc->rtcdev->dev), rtc);
|
2008-02-06 10:38:59 +01:00
|
|
|
if (ret) {
|
2012-08-14 11:19:22 +02:00
|
|
|
dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
|
2008-02-06 10:38:59 +01:00
|
|
|
rtc_device_unregister(rtc->rtcdev);
|
2012-02-15 14:24:46 +01:00
|
|
|
goto fail_register;
|
2008-02-06 10:38:59 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* NOTE: sam9260 rev A silicon has a ROM bug which resets the
|
|
|
|
* RTT on at least some reboots. If you have that chip, you must
|
|
|
|
* initialize the time from some external source like a GPS, wall
|
|
|
|
* clock, discrete RTC, etc
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (gpbr_readl(rtc) == 0)
|
|
|
|
dev_warn(&pdev->dev, "%s: SET TIME!\n",
|
2009-03-25 00:38:22 +01:00
|
|
|
dev_name(&rtc->rtcdev->dev));
|
2008-02-06 10:38:59 +01:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2011-09-18 04:17:54 +02:00
|
|
|
fail_register:
|
2012-02-15 14:24:46 +01:00
|
|
|
iounmap(rtc->gpbr);
|
|
|
|
fail_gpbr:
|
2011-09-18 04:17:54 +02:00
|
|
|
iounmap(rtc->rtt);
|
2008-02-06 10:38:59 +01:00
|
|
|
fail:
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
kfree(rtc);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Disable and remove the RTC driver
|
|
|
|
*/
|
2012-02-15 13:51:37 +01:00
|
|
|
static int __devexit at91_rtc_remove(struct platform_device *pdev)
|
2008-02-06 10:38:59 +01:00
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
u32 mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
/* disable all interrupts */
|
|
|
|
rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
|
2012-08-14 11:19:22 +02:00
|
|
|
free_irq(rtc->irq, rtc);
|
2008-02-06 10:38:59 +01:00
|
|
|
|
|
|
|
rtc_device_unregister(rtc->rtcdev);
|
|
|
|
|
2012-02-15 14:24:46 +01:00
|
|
|
iounmap(rtc->gpbr);
|
2011-09-18 04:17:54 +02:00
|
|
|
iounmap(rtc->rtt);
|
2008-02-06 10:38:59 +01:00
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
|
|
kfree(rtc);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void at91_rtc_shutdown(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
u32 mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
|
|
|
|
rtt_writel(rtc, MR, mr & ~rtc->imr);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
|
|
|
|
/* AT91SAM9 RTC Power management control */
|
|
|
|
|
|
|
|
static int at91_rtc_suspend(struct platform_device *pdev,
|
|
|
|
pm_message_t state)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
u32 mr = rtt_readl(rtc, MR);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This IRQ is shared with DBGU and other hardware which isn't
|
|
|
|
* necessarily a wakeup event source.
|
|
|
|
*/
|
|
|
|
rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
|
|
|
|
if (rtc->imr) {
|
|
|
|
if (device_may_wakeup(&pdev->dev) && (mr & AT91_RTT_ALMIEN)) {
|
2012-08-14 11:19:22 +02:00
|
|
|
enable_irq_wake(rtc->irq);
|
2008-02-06 10:38:59 +01:00
|
|
|
/* don't let RTTINC cause wakeups */
|
|
|
|
if (mr & AT91_RTT_RTTINCIEN)
|
|
|
|
rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
|
|
|
|
} else
|
|
|
|
rtt_writel(rtc, MR, mr & ~rtc->imr);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int at91_rtc_resume(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct sam9_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
u32 mr;
|
|
|
|
|
|
|
|
if (rtc->imr) {
|
|
|
|
if (device_may_wakeup(&pdev->dev))
|
2012-08-14 11:19:22 +02:00
|
|
|
disable_irq_wake(rtc->irq);
|
2008-02-06 10:38:59 +01:00
|
|
|
mr = rtt_readl(rtc, MR);
|
|
|
|
rtt_writel(rtc, MR, mr | rtc->imr);
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
#define at91_rtc_suspend NULL
|
|
|
|
#define at91_rtc_resume NULL
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct platform_driver at91_rtc_driver = {
|
2012-02-15 13:51:37 +01:00
|
|
|
.probe = at91_rtc_probe,
|
|
|
|
.remove = __devexit_p(at91_rtc_remove),
|
2008-02-06 10:38:59 +01:00
|
|
|
.shutdown = at91_rtc_shutdown,
|
|
|
|
.suspend = at91_rtc_suspend,
|
|
|
|
.resume = at91_rtc_resume,
|
2012-02-15 13:51:37 +01:00
|
|
|
.driver = {
|
|
|
|
.name = "rtc-at91sam9",
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
2008-02-06 10:38:59 +01:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init at91_rtc_init(void)
|
|
|
|
{
|
2012-02-15 13:51:37 +01:00
|
|
|
return platform_driver_register(&at91_rtc_driver);
|
2008-02-06 10:38:59 +01:00
|
|
|
}
|
|
|
|
module_init(at91_rtc_init);
|
|
|
|
|
|
|
|
static void __exit at91_rtc_exit(void)
|
|
|
|
{
|
|
|
|
platform_driver_unregister(&at91_rtc_driver);
|
|
|
|
}
|
|
|
|
module_exit(at91_rtc_exit);
|
|
|
|
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Michel Benoit");
|
|
|
|
MODULE_DESCRIPTION("RTC driver for Atmel AT91SAM9x");
|
|
|
|
MODULE_LICENSE("GPL");
|