2008-02-06 02:38:46 -07:00
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/*
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* An rtc driver for the Dallas DS1511
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*
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* Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
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2009-09-23 17:03:20 -06:00
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* Copyright (C) 2007 Andrew Sharp <andy.sharp@lsi.com>
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2008-02-06 02:38:46 -07:00
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Real time clock driver for the Dallas 1511 chip, which also
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* contains a watchdog timer. There is a tiny amount of code that
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* platform code could use to mess with the watchdog device a little
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* bit, but not a full watchdog driver.
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*/
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#include <linux/bcd.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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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 02:04:11 -06:00
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#include <linux/gfp.h>
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2008-02-06 02:38:46 -07:00
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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2011-05-27 07:57:25 -06:00
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#include <linux/module.h>
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2008-02-06 02:38:46 -07:00
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enum ds1511reg {
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DS1511_SEC = 0x0,
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DS1511_MIN = 0x1,
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DS1511_HOUR = 0x2,
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DS1511_DOW = 0x3,
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DS1511_DOM = 0x4,
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DS1511_MONTH = 0x5,
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DS1511_YEAR = 0x6,
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DS1511_CENTURY = 0x7,
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DS1511_AM1_SEC = 0x8,
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DS1511_AM2_MIN = 0x9,
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DS1511_AM3_HOUR = 0xa,
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DS1511_AM4_DATE = 0xb,
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DS1511_WD_MSEC = 0xc,
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DS1511_WD_SEC = 0xd,
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DS1511_CONTROL_A = 0xe,
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DS1511_CONTROL_B = 0xf,
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DS1511_RAMADDR_LSB = 0x10,
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DS1511_RAMDATA = 0x13
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};
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#define DS1511_BLF1 0x80
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#define DS1511_BLF2 0x40
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#define DS1511_PRS 0x20
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#define DS1511_PAB 0x10
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#define DS1511_TDF 0x08
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#define DS1511_KSF 0x04
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#define DS1511_WDF 0x02
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#define DS1511_IRQF 0x01
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#define DS1511_TE 0x80
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#define DS1511_CS 0x40
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#define DS1511_BME 0x20
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#define DS1511_TPE 0x10
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#define DS1511_TIE 0x08
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#define DS1511_KIE 0x04
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#define DS1511_WDE 0x02
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#define DS1511_WDS 0x01
|
rtc: ds1511: clean up ds1511_nvram_read()/ds1511_nvram_write()
The change removes redundant sysfs binary file boundary checks, since
this task is already done on caller side in fs/sysfs/file.c
The change enables burst mode of access to SRAM for any read()/write()
operations, it is worth to mention that this may influence on
userspace, for instance prior to the change
read(fd, buf, 1);
read(fd, buf + 1, 1);
and
read(fd, buf, 2);
sequences of syscalls over DS1511's sysfs "nvram" fd led to different
DS1511 state changes and/or buf content, if some userspace applications
are written specifically for DS1511 and exploit this strange
"feature", they may be impacted.
Also the change corrects NVRAM size accessible to userspace from 255
bytes to 256 bytes.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-08-05 12:12:58 -06:00
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#define DS1511_RAM_MAX 0x100
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2008-02-06 02:38:46 -07:00
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#define RTC_CMD DS1511_CONTROL_B
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#define RTC_CMD1 DS1511_CONTROL_A
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#define RTC_ALARM_SEC DS1511_AM1_SEC
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#define RTC_ALARM_MIN DS1511_AM2_MIN
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#define RTC_ALARM_HOUR DS1511_AM3_HOUR
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#define RTC_ALARM_DATE DS1511_AM4_DATE
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#define RTC_SEC DS1511_SEC
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#define RTC_MIN DS1511_MIN
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#define RTC_HOUR DS1511_HOUR
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#define RTC_DOW DS1511_DOW
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#define RTC_DOM DS1511_DOM
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#define RTC_MON DS1511_MONTH
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#define RTC_YEAR DS1511_YEAR
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#define RTC_CENTURY DS1511_CENTURY
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#define RTC_TIE DS1511_TIE
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#define RTC_TE DS1511_TE
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struct rtc_plat_data {
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struct rtc_device *rtc;
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void __iomem *ioaddr; /* virtual base address */
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int irq;
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unsigned int irqen;
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int alrm_sec;
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int alrm_min;
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int alrm_hour;
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int alrm_mday;
|
2009-12-15 17:45:58 -07:00
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spinlock_t lock;
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2008-02-06 02:38:46 -07:00
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};
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static DEFINE_SPINLOCK(ds1511_lock);
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static __iomem char *ds1511_base;
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static u32 reg_spacing = 1;
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2013-07-03 16:05:49 -06:00
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static noinline void
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2008-02-06 02:38:46 -07:00
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rtc_write(uint8_t val, uint32_t reg)
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{
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writeb(val, ds1511_base + (reg * reg_spacing));
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}
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2013-07-03 16:05:49 -06:00
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static inline void
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2008-02-06 02:38:46 -07:00
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rtc_write_alarm(uint8_t val, enum ds1511reg reg)
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{
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rtc_write((val | 0x80), reg);
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}
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2013-07-03 16:05:49 -06:00
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static noinline uint8_t
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2008-02-06 02:38:46 -07:00
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rtc_read(enum ds1511reg reg)
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{
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return readb(ds1511_base + (reg * reg_spacing));
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}
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2013-07-03 16:05:49 -06:00
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static inline void
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2008-02-06 02:38:46 -07:00
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rtc_disable_update(void)
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{
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rtc_write((rtc_read(RTC_CMD) & ~RTC_TE), RTC_CMD);
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}
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|
2013-07-03 16:05:49 -06:00
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static void
|
2008-02-06 02:38:46 -07:00
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rtc_enable_update(void)
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{
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rtc_write((rtc_read(RTC_CMD) | RTC_TE), RTC_CMD);
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}
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/*
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* #define DS1511_WDOG_RESET_SUPPORT
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*
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* Uncomment this if you want to use these routines in
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* some platform code.
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*/
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#ifdef DS1511_WDOG_RESET_SUPPORT
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/*
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* just enough code to set the watchdog timer so that it
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* will reboot the system
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*/
|
2013-07-03 16:05:49 -06:00
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void
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2008-02-06 02:38:46 -07:00
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ds1511_wdog_set(unsigned long deciseconds)
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{
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/*
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* the wdog timer can take 99.99 seconds
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*/
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deciseconds %= 10000;
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/*
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* set the wdog values in the wdog registers
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*/
|
2008-10-18 21:28:41 -06:00
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rtc_write(bin2bcd(deciseconds % 100), DS1511_WD_MSEC);
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rtc_write(bin2bcd(deciseconds / 100), DS1511_WD_SEC);
|
2008-02-06 02:38:46 -07:00
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/*
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* set wdog enable and wdog 'steering' bit to issue a reset
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*/
|
rtc: ds1511: clean up ds1511_nvram_read()/ds1511_nvram_write()
The change removes redundant sysfs binary file boundary checks, since
this task is already done on caller side in fs/sysfs/file.c
The change enables burst mode of access to SRAM for any read()/write()
operations, it is worth to mention that this may influence on
userspace, for instance prior to the change
read(fd, buf, 1);
read(fd, buf + 1, 1);
and
read(fd, buf, 2);
sequences of syscalls over DS1511's sysfs "nvram" fd led to different
DS1511 state changes and/or buf content, if some userspace applications
are written specifically for DS1511 and exploit this strange
"feature", they may be impacted.
Also the change corrects NVRAM size accessible to userspace from 255
bytes to 256 bytes.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-08-05 12:12:58 -06:00
|
|
|
rtc_write(rtc_read(RTC_CMD) | DS1511_WDE | DS1511_WDS, RTC_CMD);
|
2008-02-06 02:38:46 -07:00
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}
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|
2013-07-03 16:05:49 -06:00
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void
|
2008-02-06 02:38:46 -07:00
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ds1511_wdog_disable(void)
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{
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/*
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* clear wdog enable and wdog 'steering' bits
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*/
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rtc_write(rtc_read(RTC_CMD) & ~(DS1511_WDE | DS1511_WDS), RTC_CMD);
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/*
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* clear the wdog counter
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*/
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rtc_write(0, DS1511_WD_MSEC);
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rtc_write(0, DS1511_WD_SEC);
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}
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#endif
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/*
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* set the rtc chip's idea of the time.
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* stupidly, some callers call with year unmolested;
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* and some call with year = year - 1900. thanks.
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*/
|
2008-04-28 03:11:55 -06:00
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static int ds1511_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)
|
2008-02-06 02:38:46 -07:00
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{
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u8 mon, day, dow, hrs, min, sec, yrs, cen;
|
2008-05-06 21:42:30 -06:00
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unsigned long flags;
|
2008-02-06 02:38:46 -07:00
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/*
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* won't have to change this for a while
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*/
|
2013-07-03 16:05:49 -06:00
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if (rtc_tm->tm_year < 1900)
|
2008-02-06 02:38:46 -07:00
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rtc_tm->tm_year += 1900;
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|
2013-07-03 16:05:49 -06:00
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|
if (rtc_tm->tm_year < 1970)
|
2008-02-06 02:38:46 -07:00
|
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return -EINVAL;
|
2013-07-03 16:05:49 -06:00
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|
2008-02-06 02:38:46 -07:00
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yrs = rtc_tm->tm_year % 100;
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cen = rtc_tm->tm_year / 100;
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mon = rtc_tm->tm_mon + 1; /* tm_mon starts at zero */
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day = rtc_tm->tm_mday;
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dow = rtc_tm->tm_wday & 0x7; /* automatic BCD */
|
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hrs = rtc_tm->tm_hour;
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|
min = rtc_tm->tm_min;
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sec = rtc_tm->tm_sec;
|
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|
|
|
2013-07-03 16:05:49 -06:00
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if ((mon > 12) || (day == 0))
|
2008-02-06 02:38:46 -07:00
|
|
|
return -EINVAL;
|
|
|
|
|
2013-07-03 16:05:49 -06:00
|
|
|
if (day > rtc_month_days(rtc_tm->tm_mon, rtc_tm->tm_year))
|
2008-02-06 02:38:46 -07:00
|
|
|
return -EINVAL;
|
|
|
|
|
2013-07-03 16:05:49 -06:00
|
|
|
if ((hrs >= 24) || (min >= 60) || (sec >= 60))
|
2008-02-06 02:38:46 -07:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* each register is a different number of valid bits
|
|
|
|
*/
|
2008-10-18 21:28:41 -06:00
|
|
|
sec = bin2bcd(sec) & 0x7f;
|
|
|
|
min = bin2bcd(min) & 0x7f;
|
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|
|
hrs = bin2bcd(hrs) & 0x3f;
|
|
|
|
day = bin2bcd(day) & 0x3f;
|
|
|
|
mon = bin2bcd(mon) & 0x1f;
|
|
|
|
yrs = bin2bcd(yrs) & 0xff;
|
|
|
|
cen = bin2bcd(cen) & 0xff;
|
2008-02-06 02:38:46 -07:00
|
|
|
|
|
|
|
spin_lock_irqsave(&ds1511_lock, flags);
|
|
|
|
rtc_disable_update();
|
|
|
|
rtc_write(cen, RTC_CENTURY);
|
|
|
|
rtc_write(yrs, RTC_YEAR);
|
|
|
|
rtc_write((rtc_read(RTC_MON) & 0xe0) | mon, RTC_MON);
|
|
|
|
rtc_write(day, RTC_DOM);
|
|
|
|
rtc_write(hrs, RTC_HOUR);
|
|
|
|
rtc_write(min, RTC_MIN);
|
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|
|
rtc_write(sec, RTC_SEC);
|
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|
|
rtc_write(dow, RTC_DOW);
|
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|
|
rtc_enable_update();
|
|
|
|
spin_unlock_irqrestore(&ds1511_lock, flags);
|
|
|
|
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|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-04-28 03:11:55 -06:00
|
|
|
static int ds1511_rtc_read_time(struct device *dev, struct rtc_time *rtc_tm)
|
2008-02-06 02:38:46 -07:00
|
|
|
{
|
|
|
|
unsigned int century;
|
2008-05-06 21:42:30 -06:00
|
|
|
unsigned long flags;
|
2008-02-06 02:38:46 -07:00
|
|
|
|
|
|
|
spin_lock_irqsave(&ds1511_lock, flags);
|
|
|
|
rtc_disable_update();
|
|
|
|
|
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|
|
rtc_tm->tm_sec = rtc_read(RTC_SEC) & 0x7f;
|
|
|
|
rtc_tm->tm_min = rtc_read(RTC_MIN) & 0x7f;
|
|
|
|
rtc_tm->tm_hour = rtc_read(RTC_HOUR) & 0x3f;
|
|
|
|
rtc_tm->tm_mday = rtc_read(RTC_DOM) & 0x3f;
|
|
|
|
rtc_tm->tm_wday = rtc_read(RTC_DOW) & 0x7;
|
|
|
|
rtc_tm->tm_mon = rtc_read(RTC_MON) & 0x1f;
|
|
|
|
rtc_tm->tm_year = rtc_read(RTC_YEAR) & 0x7f;
|
|
|
|
century = rtc_read(RTC_CENTURY);
|
|
|
|
|
|
|
|
rtc_enable_update();
|
|
|
|
spin_unlock_irqrestore(&ds1511_lock, flags);
|
|
|
|
|
2008-10-18 21:28:41 -06:00
|
|
|
rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
|
|
|
|
rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
|
|
|
|
rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
|
|
|
|
rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
|
|
|
|
rtc_tm->tm_wday = bcd2bin(rtc_tm->tm_wday);
|
|
|
|
rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
|
|
|
|
rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
|
|
|
|
century = bcd2bin(century) * 100;
|
2008-02-06 02:38:46 -07:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Account for differences between how the RTC uses the values
|
|
|
|
* and how they are defined in a struct rtc_time;
|
|
|
|
*/
|
|
|
|
century += rtc_tm->tm_year;
|
|
|
|
rtc_tm->tm_year = century - 1900;
|
|
|
|
|
|
|
|
rtc_tm->tm_mon--;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* write the alarm register settings
|
|
|
|
*
|
|
|
|
* we only have the use to interrupt every second, otherwise
|
|
|
|
* known as the update interrupt, or the interrupt if the whole
|
|
|
|
* date/hours/mins/secs matches. the ds1511 has many more
|
|
|
|
* permutations, but the kernel doesn't.
|
|
|
|
*/
|
2013-07-03 16:05:49 -06:00
|
|
|
static void
|
2008-02-06 02:38:46 -07:00
|
|
|
ds1511_rtc_update_alarm(struct rtc_plat_data *pdata)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
2009-12-15 17:45:58 -07:00
|
|
|
spin_lock_irqsave(&pdata->lock, flags);
|
2008-02-06 02:38:46 -07:00
|
|
|
rtc_write(pdata->alrm_mday < 0 || (pdata->irqen & RTC_UF) ?
|
2008-10-18 21:28:41 -06:00
|
|
|
0x80 : bin2bcd(pdata->alrm_mday) & 0x3f,
|
2008-02-06 02:38:46 -07:00
|
|
|
RTC_ALARM_DATE);
|
|
|
|
rtc_write(pdata->alrm_hour < 0 || (pdata->irqen & RTC_UF) ?
|
2008-10-18 21:28:41 -06:00
|
|
|
0x80 : bin2bcd(pdata->alrm_hour) & 0x3f,
|
2008-02-06 02:38:46 -07:00
|
|
|
RTC_ALARM_HOUR);
|
|
|
|
rtc_write(pdata->alrm_min < 0 || (pdata->irqen & RTC_UF) ?
|
2008-10-18 21:28:41 -06:00
|
|
|
0x80 : bin2bcd(pdata->alrm_min) & 0x7f,
|
2008-02-06 02:38:46 -07:00
|
|
|
RTC_ALARM_MIN);
|
|
|
|
rtc_write(pdata->alrm_sec < 0 || (pdata->irqen & RTC_UF) ?
|
2008-10-18 21:28:41 -06:00
|
|
|
0x80 : bin2bcd(pdata->alrm_sec) & 0x7f,
|
2008-02-06 02:38:46 -07:00
|
|
|
RTC_ALARM_SEC);
|
|
|
|
rtc_write(rtc_read(RTC_CMD) | (pdata->irqen ? RTC_TIE : 0), RTC_CMD);
|
|
|
|
rtc_read(RTC_CMD1); /* clear interrupts */
|
2009-12-15 17:45:58 -07:00
|
|
|
spin_unlock_irqrestore(&pdata->lock, flags);
|
2008-02-06 02:38:46 -07:00
|
|
|
}
|
|
|
|
|
2013-07-03 16:05:49 -06:00
|
|
|
static int
|
2008-02-06 02:38:46 -07:00
|
|
|
ds1511_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
|
|
{
|
|
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
|
2009-01-06 15:42:11 -07:00
|
|
|
if (pdata->irq <= 0)
|
2008-02-06 02:38:46 -07:00
|
|
|
return -EINVAL;
|
2009-01-06 15:42:11 -07:00
|
|
|
|
2008-02-06 02:38:46 -07:00
|
|
|
pdata->alrm_mday = alrm->time.tm_mday;
|
|
|
|
pdata->alrm_hour = alrm->time.tm_hour;
|
|
|
|
pdata->alrm_min = alrm->time.tm_min;
|
|
|
|
pdata->alrm_sec = alrm->time.tm_sec;
|
2013-07-03 16:05:49 -06:00
|
|
|
if (alrm->enabled)
|
2008-02-06 02:38:46 -07:00
|
|
|
pdata->irqen |= RTC_AF;
|
2013-07-03 16:05:49 -06:00
|
|
|
|
2008-02-06 02:38:46 -07:00
|
|
|
ds1511_rtc_update_alarm(pdata);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-07-03 16:05:49 -06:00
|
|
|
static int
|
2008-02-06 02:38:46 -07:00
|
|
|
ds1511_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
|
|
{
|
|
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
|
2009-01-06 15:42:11 -07:00
|
|
|
if (pdata->irq <= 0)
|
2008-02-06 02:38:46 -07:00
|
|
|
return -EINVAL;
|
2009-01-06 15:42:11 -07:00
|
|
|
|
2008-02-06 02:38:46 -07:00
|
|
|
alrm->time.tm_mday = pdata->alrm_mday < 0 ? 0 : pdata->alrm_mday;
|
|
|
|
alrm->time.tm_hour = pdata->alrm_hour < 0 ? 0 : pdata->alrm_hour;
|
|
|
|
alrm->time.tm_min = pdata->alrm_min < 0 ? 0 : pdata->alrm_min;
|
|
|
|
alrm->time.tm_sec = pdata->alrm_sec < 0 ? 0 : pdata->alrm_sec;
|
|
|
|
alrm->enabled = (pdata->irqen & RTC_AF) ? 1 : 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-07-03 16:05:49 -06:00
|
|
|
static irqreturn_t
|
2008-02-06 02:38:46 -07:00
|
|
|
ds1511_interrupt(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct platform_device *pdev = dev_id;
|
|
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
2009-12-15 17:45:58 -07:00
|
|
|
unsigned long events = 0;
|
2008-02-06 02:38:46 -07:00
|
|
|
|
2009-12-15 17:45:58 -07:00
|
|
|
spin_lock(&pdata->lock);
|
2008-02-06 02:38:46 -07:00
|
|
|
/*
|
|
|
|
* read and clear interrupt
|
|
|
|
*/
|
2009-12-15 17:45:58 -07:00
|
|
|
if (rtc_read(RTC_CMD1) & DS1511_IRQF) {
|
|
|
|
events = RTC_IRQF;
|
|
|
|
if (rtc_read(RTC_ALARM_SEC) & 0x80)
|
|
|
|
events |= RTC_UF;
|
|
|
|
else
|
|
|
|
events |= RTC_AF;
|
2014-04-03 15:50:20 -06:00
|
|
|
rtc_update_irq(pdata->rtc, 1, events);
|
2009-12-15 17:45:58 -07:00
|
|
|
}
|
|
|
|
spin_unlock(&pdata->lock);
|
|
|
|
return events ? IRQ_HANDLED : IRQ_NONE;
|
2008-02-06 02:38:46 -07:00
|
|
|
}
|
|
|
|
|
2009-12-15 17:45:58 -07:00
|
|
|
static int ds1511_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
2008-02-06 02:38:46 -07:00
|
|
|
{
|
|
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
|
|
|
2009-12-15 17:45:58 -07:00
|
|
|
if (pdata->irq <= 0)
|
|
|
|
return -EINVAL;
|
|
|
|
if (enabled)
|
2008-02-06 02:38:46 -07:00
|
|
|
pdata->irqen |= RTC_AF;
|
2009-12-15 17:45:58 -07:00
|
|
|
else
|
|
|
|
pdata->irqen &= ~RTC_AF;
|
|
|
|
ds1511_rtc_update_alarm(pdata);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-02-06 02:38:46 -07:00
|
|
|
static const struct rtc_class_ops ds1511_rtc_ops = {
|
2009-12-15 17:45:58 -07:00
|
|
|
.read_time = ds1511_rtc_read_time,
|
|
|
|
.set_time = ds1511_rtc_set_time,
|
|
|
|
.read_alarm = ds1511_rtc_read_alarm,
|
|
|
|
.set_alarm = ds1511_rtc_set_alarm,
|
|
|
|
.alarm_irq_enable = ds1511_rtc_alarm_irq_enable,
|
2008-02-06 02:38:46 -07:00
|
|
|
};
|
|
|
|
|
2017-10-12 16:05:29 -06:00
|
|
|
static int ds1511_nvram_read(void *priv, unsigned int pos, void *buf,
|
|
|
|
size_t size)
|
2008-02-06 02:38:46 -07:00
|
|
|
{
|
2017-10-12 16:05:29 -06:00
|
|
|
int i;
|
2008-02-06 02:38:46 -07:00
|
|
|
|
|
|
|
rtc_write(pos, DS1511_RAMADDR_LSB);
|
2017-10-12 16:05:29 -06:00
|
|
|
for (i = 0; i < size; i++)
|
|
|
|
*(char *)buf++ = rtc_read(DS1511_RAMDATA);
|
2013-07-03 16:05:49 -06:00
|
|
|
|
2017-10-12 16:05:29 -06:00
|
|
|
return 0;
|
2008-02-06 02:38:46 -07:00
|
|
|
}
|
|
|
|
|
2017-10-12 16:05:29 -06:00
|
|
|
static int ds1511_nvram_write(void *priv, unsigned int pos, void *buf,
|
|
|
|
size_t size)
|
2008-02-06 02:38:46 -07:00
|
|
|
{
|
2017-10-12 16:05:29 -06:00
|
|
|
int i;
|
2008-02-06 02:38:46 -07:00
|
|
|
|
|
|
|
rtc_write(pos, DS1511_RAMADDR_LSB);
|
2017-10-12 16:05:29 -06:00
|
|
|
for (i = 0; i < size; i++)
|
|
|
|
rtc_write(*(char *)buf++, DS1511_RAMDATA);
|
2013-07-03 16:05:49 -06:00
|
|
|
|
2017-10-12 16:05:29 -06:00
|
|
|
return 0;
|
2008-02-06 02:38:46 -07:00
|
|
|
}
|
|
|
|
|
2012-12-21 14:09:38 -07:00
|
|
|
static int ds1511_rtc_probe(struct platform_device *pdev)
|
2008-02-06 02:38:46 -07:00
|
|
|
{
|
|
|
|
struct resource *res;
|
2009-12-15 17:45:58 -07:00
|
|
|
struct rtc_plat_data *pdata;
|
2008-02-06 02:38:46 -07:00
|
|
|
int ret = 0;
|
2018-02-12 15:47:25 -07:00
|
|
|
struct nvmem_config ds1511_nvmem_cfg = {
|
|
|
|
.name = "ds1511_nvram",
|
|
|
|
.word_size = 1,
|
|
|
|
.stride = 1,
|
|
|
|
.size = DS1511_RAM_MAX,
|
|
|
|
.reg_read = ds1511_nvram_read,
|
|
|
|
.reg_write = ds1511_nvram_write,
|
|
|
|
.priv = &pdev->dev,
|
|
|
|
};
|
2008-02-06 02:38:46 -07:00
|
|
|
|
2009-12-15 17:45:58 -07:00
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
|
|
if (!pdata)
|
2008-02-06 02:38:46 -07:00
|
|
|
return -ENOMEM;
|
2013-09-11 15:24:27 -06:00
|
|
|
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
ds1511_base = devm_ioremap_resource(&pdev->dev, res);
|
|
|
|
if (IS_ERR(ds1511_base))
|
|
|
|
return PTR_ERR(ds1511_base);
|
2008-02-06 02:38:46 -07:00
|
|
|
pdata->ioaddr = ds1511_base;
|
|
|
|
pdata->irq = platform_get_irq(pdev, 0);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* turn on the clock and the crystal, etc.
|
|
|
|
*/
|
rtc: ds1511: clean up ds1511_nvram_read()/ds1511_nvram_write()
The change removes redundant sysfs binary file boundary checks, since
this task is already done on caller side in fs/sysfs/file.c
The change enables burst mode of access to SRAM for any read()/write()
operations, it is worth to mention that this may influence on
userspace, for instance prior to the change
read(fd, buf, 1);
read(fd, buf + 1, 1);
and
read(fd, buf, 2);
sequences of syscalls over DS1511's sysfs "nvram" fd led to different
DS1511 state changes and/or buf content, if some userspace applications
are written specifically for DS1511 and exploit this strange
"feature", they may be impacted.
Also the change corrects NVRAM size accessible to userspace from 255
bytes to 256 bytes.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-08-05 12:12:58 -06:00
|
|
|
rtc_write(DS1511_BME, RTC_CMD);
|
2008-02-06 02:38:46 -07:00
|
|
|
rtc_write(0, RTC_CMD1);
|
|
|
|
/*
|
|
|
|
* clear the wdog counter
|
|
|
|
*/
|
|
|
|
rtc_write(0, DS1511_WD_MSEC);
|
|
|
|
rtc_write(0, DS1511_WD_SEC);
|
|
|
|
/*
|
|
|
|
* start the clock
|
|
|
|
*/
|
|
|
|
rtc_enable_update();
|
|
|
|
|
|
|
|
/*
|
|
|
|
* check for a dying bat-tree
|
|
|
|
*/
|
2013-07-03 16:05:49 -06:00
|
|
|
if (rtc_read(RTC_CMD1) & DS1511_BLF1)
|
2008-02-06 02:38:46 -07:00
|
|
|
dev_warn(&pdev->dev, "voltage-low detected.\n");
|
|
|
|
|
2009-12-15 17:45:58 -07:00
|
|
|
spin_lock_init(&pdata->lock);
|
|
|
|
platform_set_drvdata(pdev, pdata);
|
2014-04-03 15:49:36 -06:00
|
|
|
|
2017-10-12 16:05:27 -06:00
|
|
|
pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
|
2014-04-03 15:49:36 -06:00
|
|
|
if (IS_ERR(pdata->rtc))
|
|
|
|
return PTR_ERR(pdata->rtc);
|
|
|
|
|
2017-10-12 16:05:27 -06:00
|
|
|
pdata->rtc->ops = &ds1511_rtc_ops;
|
|
|
|
|
2017-10-12 16:05:29 -06:00
|
|
|
pdata->rtc->nvram_old_abi = true;
|
|
|
|
|
2017-10-12 16:05:27 -06:00
|
|
|
ret = rtc_register_device(pdata->rtc);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2018-02-12 15:47:24 -07:00
|
|
|
rtc_nvmem_register(pdata->rtc, &ds1511_nvmem_cfg);
|
|
|
|
|
2008-02-06 02:38:46 -07:00
|
|
|
/*
|
|
|
|
* if the platform has an interrupt in mind for this device,
|
|
|
|
* then by all means, set it
|
|
|
|
*/
|
2009-01-06 15:42:11 -07:00
|
|
|
if (pdata->irq > 0) {
|
2008-02-06 02:38:46 -07:00
|
|
|
rtc_read(RTC_CMD1);
|
2009-12-15 17:45:58 -07:00
|
|
|
if (devm_request_irq(&pdev->dev, pdata->irq, ds1511_interrupt,
|
2012-03-23 16:02:34 -06:00
|
|
|
IRQF_SHARED, pdev->name, pdev) < 0) {
|
2008-02-06 02:38:46 -07:00
|
|
|
|
|
|
|
dev_warn(&pdev->dev, "interrupt not available.\n");
|
2009-01-06 15:42:11 -07:00
|
|
|
pdata->irq = 0;
|
2008-02-06 02:38:46 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-04-10 22:29:25 -06:00
|
|
|
/* work with hotplug and coldplug */
|
|
|
|
MODULE_ALIAS("platform:ds1511");
|
|
|
|
|
2008-02-06 02:38:46 -07:00
|
|
|
static struct platform_driver ds1511_rtc_driver = {
|
|
|
|
.probe = ds1511_rtc_probe,
|
|
|
|
.driver = {
|
|
|
|
.name = "ds1511",
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2012-01-10 16:10:48 -07:00
|
|
|
module_platform_driver(ds1511_rtc_driver);
|
2008-02-06 02:38:46 -07:00
|
|
|
|
2009-09-23 17:03:20 -06:00
|
|
|
MODULE_AUTHOR("Andrew Sharp <andy.sharp@lsi.com>");
|
2008-02-06 02:38:46 -07:00
|
|
|
MODULE_DESCRIPTION("Dallas DS1511 RTC driver");
|
|
|
|
MODULE_LICENSE("GPL");
|