2006-07-01 13:36:26 +02:00
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/* drivers/rtc/rtc-s3c.c
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*
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* Copyright (c) 2004,2006 Simtec Electronics
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* Ben Dooks, <ben@simtec.co.uk>
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* http://armlinux.simtec.co.uk/
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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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* S3C2410/S3C2440/S3C24XX Internal RTC Driver
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/clk.h>
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2008-02-06 10:38:42 +01:00
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#include <linux/log2.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 09:04:11 +01:00
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#include <linux/slab.h>
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2006-07-01 13:36:26 +02:00
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2008-08-05 17:14:15 +02:00
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#include <mach/hardware.h>
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2006-07-01 13:36:26 +02:00
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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2008-10-30 11:14:34 +01:00
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#include <plat/regs-rtc.h>
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2006-07-01 13:36:26 +02:00
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/* I have yet to find an S3C implementation with more than one
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* of these rtc blocks in */
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static struct resource *s3c_rtc_mem;
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static void __iomem *s3c_rtc_base;
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static int s3c_rtc_alarmno = NO_IRQ;
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static int s3c_rtc_tickno = NO_IRQ;
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static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
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/* IRQ Handlers */
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:55:46 +02:00
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static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
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2006-07-01 13:36:26 +02:00
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{
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struct rtc_device *rdev = id;
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2007-05-08 09:33:30 +02:00
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rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
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2006-07-01 13:36:26 +02:00
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return IRQ_HANDLED;
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}
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:55:46 +02:00
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static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
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2006-07-01 13:36:26 +02:00
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{
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struct rtc_device *rdev = id;
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2008-07-24 06:30:45 +02:00
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rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
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2006-07-01 13:36:26 +02:00
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return IRQ_HANDLED;
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}
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/* Update control registers */
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static void s3c_rtc_setaie(int to)
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{
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unsigned int tmp;
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2008-04-28 11:12:00 +02:00
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pr_debug("%s: aie=%d\n", __func__, to);
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2006-07-01 13:36:26 +02:00
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2006-08-27 10:23:22 +02:00
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tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
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2006-07-01 13:36:26 +02:00
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if (to)
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tmp |= S3C2410_RTCALM_ALMEN;
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2006-08-27 10:23:22 +02:00
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writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
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2006-07-01 13:36:26 +02:00
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}
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2008-07-24 06:30:45 +02:00
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static int s3c_rtc_setpie(struct device *dev, int enabled)
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2006-07-01 13:36:26 +02:00
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{
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unsigned int tmp;
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2008-07-24 06:30:45 +02:00
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pr_debug("%s: pie=%d\n", __func__, enabled);
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2006-07-01 13:36:26 +02:00
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spin_lock_irq(&s3c_rtc_pie_lock);
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2006-08-27 10:23:22 +02:00
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tmp = readb(s3c_rtc_base + S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
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2006-07-01 13:36:26 +02:00
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2008-07-24 06:30:45 +02:00
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if (enabled)
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2006-07-01 13:36:26 +02:00
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tmp |= S3C2410_TICNT_ENABLE;
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2006-08-27 10:23:22 +02:00
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writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
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2006-07-01 13:36:26 +02:00
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spin_unlock_irq(&s3c_rtc_pie_lock);
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2008-07-24 06:30:45 +02:00
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return 0;
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2006-07-01 13:36:26 +02:00
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}
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2008-07-24 06:30:45 +02:00
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static int s3c_rtc_setfreq(struct device *dev, int freq)
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2006-07-01 13:36:26 +02:00
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{
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unsigned int tmp;
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2009-01-06 23:42:12 +01:00
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if (!is_power_of_2(freq))
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return -EINVAL;
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2006-07-01 13:36:26 +02:00
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spin_lock_irq(&s3c_rtc_pie_lock);
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2008-07-24 06:30:45 +02:00
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tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
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2006-07-01 13:36:26 +02:00
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tmp |= (128 / freq)-1;
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2006-08-27 10:23:22 +02:00
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writeb(tmp, s3c_rtc_base + S3C2410_TICNT);
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2006-07-01 13:36:26 +02:00
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spin_unlock_irq(&s3c_rtc_pie_lock);
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2008-07-24 06:30:45 +02:00
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return 0;
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2006-07-01 13:36:26 +02:00
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}
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/* Time read/write */
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static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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unsigned int have_retried = 0;
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2006-08-27 10:23:22 +02:00
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void __iomem *base = s3c_rtc_base;
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2006-07-01 13:36:26 +02:00
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retry_get_time:
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2006-08-27 10:23:22 +02:00
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rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
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rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
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rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
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rtc_tm->tm_mon = readb(base + S3C2410_RTCMON);
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rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
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rtc_tm->tm_sec = readb(base + S3C2410_RTCSEC);
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2006-07-01 13:36:26 +02:00
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/* the only way to work out wether the system was mid-update
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* when we read it is to check the second counter, and if it
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* is zero, then we re-try the entire read
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*/
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if (rtc_tm->tm_sec == 0 && !have_retried) {
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have_retried = 1;
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goto retry_get_time;
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}
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pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
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rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
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rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
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2008-10-19 05:28:41 +02:00
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rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
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rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
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rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
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rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
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rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
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rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
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2006-07-01 13:36:26 +02:00
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rtc_tm->tm_year += 100;
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rtc_tm->tm_mon -= 1;
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return 0;
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}
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static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
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{
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2006-08-27 10:23:22 +02:00
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void __iomem *base = s3c_rtc_base;
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2006-08-27 10:23:27 +02:00
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int year = tm->tm_year - 100;
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2006-08-27 10:23:22 +02:00
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2006-08-27 10:23:27 +02:00
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pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n",
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tm->tm_year, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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/* we get around y2k by simply not supporting it */
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2006-07-01 13:36:26 +02:00
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2006-08-27 10:23:27 +02:00
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if (year < 0 || year >= 100) {
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2006-08-27 10:23:22 +02:00
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dev_err(dev, "rtc only supports 100 years\n");
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2006-07-01 13:36:26 +02:00
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return -EINVAL;
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2006-08-27 10:23:22 +02:00
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}
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2008-10-19 05:28:41 +02:00
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writeb(bin2bcd(tm->tm_sec), base + S3C2410_RTCSEC);
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writeb(bin2bcd(tm->tm_min), base + S3C2410_RTCMIN);
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writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
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writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
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writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
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writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
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2006-07-01 13:36:26 +02:00
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return 0;
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}
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static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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|
|
|
|
struct rtc_time *alm_tm = &alrm->time;
|
2006-08-27 10:23:22 +02:00
|
|
|
void __iomem *base = s3c_rtc_base;
|
2006-07-01 13:36:26 +02:00
|
|
|
unsigned int alm_en;
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
|
|
|
|
|
alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
|
|
|
|
|
alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
|
|
|
|
|
alm_tm->tm_mon = readb(base + S3C2410_ALMMON);
|
|
|
|
|
alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
|
|
|
|
|
alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
alm_en = readb(base + S3C2410_RTCALM);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
2006-12-13 09:35:08 +01:00
|
|
|
alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
|
|
|
|
|
|
2006-07-01 13:36:26 +02:00
|
|
|
pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
|
|
|
|
|
alm_en,
|
|
|
|
|
alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
|
|
|
|
|
alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* decode the alarm enable field */
|
|
|
|
|
|
|
|
|
|
if (alm_en & S3C2410_RTCALM_SECEN)
|
2008-10-19 05:28:41 +02:00
|
|
|
alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
|
2006-07-01 13:36:26 +02:00
|
|
|
else
|
|
|
|
|
alm_tm->tm_sec = 0xff;
|
|
|
|
|
|
|
|
|
|
if (alm_en & S3C2410_RTCALM_MINEN)
|
2008-10-19 05:28:41 +02:00
|
|
|
alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
|
2006-07-01 13:36:26 +02:00
|
|
|
else
|
|
|
|
|
alm_tm->tm_min = 0xff;
|
|
|
|
|
|
|
|
|
|
if (alm_en & S3C2410_RTCALM_HOUREN)
|
2008-10-19 05:28:41 +02:00
|
|
|
alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
|
2006-07-01 13:36:26 +02:00
|
|
|
else
|
|
|
|
|
alm_tm->tm_hour = 0xff;
|
|
|
|
|
|
|
|
|
|
if (alm_en & S3C2410_RTCALM_DAYEN)
|
2008-10-19 05:28:41 +02:00
|
|
|
alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
|
2006-07-01 13:36:26 +02:00
|
|
|
else
|
|
|
|
|
alm_tm->tm_mday = 0xff;
|
|
|
|
|
|
|
|
|
|
if (alm_en & S3C2410_RTCALM_MONEN) {
|
2008-10-19 05:28:41 +02:00
|
|
|
alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
|
2006-07-01 13:36:26 +02:00
|
|
|
alm_tm->tm_mon -= 1;
|
|
|
|
|
} else {
|
|
|
|
|
alm_tm->tm_mon = 0xff;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (alm_en & S3C2410_RTCALM_YEAREN)
|
2008-10-19 05:28:41 +02:00
|
|
|
alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
|
2006-07-01 13:36:26 +02:00
|
|
|
else
|
|
|
|
|
alm_tm->tm_year = 0xffff;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
|
|
|
{
|
|
|
|
|
struct rtc_time *tm = &alrm->time;
|
2006-08-27 10:23:22 +02:00
|
|
|
void __iomem *base = s3c_rtc_base;
|
2006-07-01 13:36:26 +02:00
|
|
|
unsigned int alrm_en;
|
|
|
|
|
|
|
|
|
|
pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
|
|
|
|
|
alrm->enabled,
|
|
|
|
|
tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
|
|
|
|
|
tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
|
|
|
|
|
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
|
|
|
|
|
writeb(0x00, base + S3C2410_RTCALM);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
|
|
|
|
|
alrm_en |= S3C2410_RTCALM_SECEN;
|
2008-10-19 05:28:41 +02:00
|
|
|
writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (tm->tm_min < 60 && tm->tm_min >= 0) {
|
|
|
|
|
alrm_en |= S3C2410_RTCALM_MINEN;
|
2008-10-19 05:28:41 +02:00
|
|
|
writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
|
|
|
|
|
alrm_en |= S3C2410_RTCALM_HOUREN;
|
2008-10-19 05:28:41 +02:00
|
|
|
writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
writeb(alrm_en, base + S3C2410_RTCALM);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
2008-07-24 06:30:45 +02:00
|
|
|
s3c_rtc_setaie(alrm->enabled);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
if (alrm->enabled)
|
|
|
|
|
enable_irq_wake(s3c_rtc_alarmno);
|
|
|
|
|
else
|
|
|
|
|
disable_irq_wake(s3c_rtc_alarmno);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
|
|
|
|
|
{
|
2006-08-27 10:23:22 +02:00
|
|
|
unsigned int ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
seq_printf(seq, "periodic_IRQ\t: %s\n",
|
|
|
|
|
(ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int s3c_rtc_open(struct device *dev)
|
|
|
|
|
{
|
|
|
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
|
struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
|
2007-02-14 09:33:16 +01:00
|
|
|
IRQF_DISABLED, "s3c2410-rtc alarm", rtc_dev);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
|
2007-02-14 09:33:16 +01:00
|
|
|
IRQF_DISABLED, "s3c2410-rtc tick", rtc_dev);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
if (ret) {
|
|
|
|
|
dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
|
|
|
|
|
goto tick_err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
|
|
tick_err:
|
|
|
|
|
free_irq(s3c_rtc_alarmno, rtc_dev);
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void s3c_rtc_release(struct device *dev)
|
|
|
|
|
{
|
|
|
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
|
struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
|
|
/* do not clear AIE here, it may be needed for wake */
|
|
|
|
|
|
2008-07-24 06:30:45 +02:00
|
|
|
s3c_rtc_setpie(dev, 0);
|
2006-07-01 13:36:26 +02:00
|
|
|
free_irq(s3c_rtc_alarmno, rtc_dev);
|
|
|
|
|
free_irq(s3c_rtc_tickno, rtc_dev);
|
|
|
|
|
}
|
|
|
|
|
|
2006-10-01 08:28:17 +02:00
|
|
|
static const struct rtc_class_ops s3c_rtcops = {
|
2006-07-01 13:36:26 +02:00
|
|
|
.open = s3c_rtc_open,
|
|
|
|
|
.release = s3c_rtc_release,
|
|
|
|
|
.read_time = s3c_rtc_gettime,
|
|
|
|
|
.set_time = s3c_rtc_settime,
|
|
|
|
|
.read_alarm = s3c_rtc_getalarm,
|
|
|
|
|
.set_alarm = s3c_rtc_setalarm,
|
2008-07-24 06:30:45 +02:00
|
|
|
.irq_set_freq = s3c_rtc_setfreq,
|
|
|
|
|
.irq_set_state = s3c_rtc_setpie,
|
2006-07-01 13:36:26 +02:00
|
|
|
.proc = s3c_rtc_proc,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static void s3c_rtc_enable(struct platform_device *pdev, int en)
|
|
|
|
|
{
|
2006-08-27 10:23:22 +02:00
|
|
|
void __iomem *base = s3c_rtc_base;
|
2006-07-01 13:36:26 +02:00
|
|
|
unsigned int tmp;
|
|
|
|
|
|
|
|
|
|
if (s3c_rtc_base == NULL)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (!en) {
|
2006-08-27 10:23:22 +02:00
|
|
|
tmp = readb(base + S3C2410_RTCCON);
|
|
|
|
|
writeb(tmp & ~S3C2410_RTCCON_RTCEN, base + S3C2410_RTCCON);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
tmp = readb(base + S3C2410_TICNT);
|
|
|
|
|
writeb(tmp & ~S3C2410_TICNT_ENABLE, base + S3C2410_TICNT);
|
2006-07-01 13:36:26 +02:00
|
|
|
} else {
|
|
|
|
|
/* re-enable the device, and check it is ok */
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
if ((readb(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
|
2006-07-01 13:36:26 +02:00
|
|
|
dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
tmp = readb(base + S3C2410_RTCCON);
|
|
|
|
|
writeb(tmp|S3C2410_RTCCON_RTCEN, base+S3C2410_RTCCON);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
|
2006-07-01 13:36:26 +02:00
|
|
|
dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
tmp = readb(base + S3C2410_RTCCON);
|
|
|
|
|
writeb(tmp& ~S3C2410_RTCCON_CNTSEL, base+S3C2410_RTCCON);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
if ((readb(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
|
2006-07-01 13:36:26 +02:00
|
|
|
dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
tmp = readb(base + S3C2410_RTCCON);
|
|
|
|
|
writeb(tmp & ~S3C2410_RTCCON_CLKRST, base+S3C2410_RTCCON);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2008-07-24 06:30:44 +02:00
|
|
|
static int __devexit s3c_rtc_remove(struct platform_device *dev)
|
2006-07-01 13:36:26 +02:00
|
|
|
{
|
|
|
|
|
struct rtc_device *rtc = platform_get_drvdata(dev);
|
|
|
|
|
|
|
|
|
|
platform_set_drvdata(dev, NULL);
|
|
|
|
|
rtc_device_unregister(rtc);
|
|
|
|
|
|
2008-07-24 06:30:45 +02:00
|
|
|
s3c_rtc_setpie(&dev->dev, 0);
|
2006-07-01 13:36:26 +02:00
|
|
|
s3c_rtc_setaie(0);
|
|
|
|
|
|
|
|
|
|
iounmap(s3c_rtc_base);
|
|
|
|
|
release_resource(s3c_rtc_mem);
|
|
|
|
|
kfree(s3c_rtc_mem);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2008-07-24 06:30:44 +02:00
|
|
|
static int __devinit s3c_rtc_probe(struct platform_device *pdev)
|
2006-07-01 13:36:26 +02:00
|
|
|
{
|
|
|
|
|
struct rtc_device *rtc;
|
|
|
|
|
struct resource *res;
|
|
|
|
|
int ret;
|
|
|
|
|
|
2008-04-28 11:12:00 +02:00
|
|
|
pr_debug("%s: probe=%p\n", __func__, pdev);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
/* find the IRQs */
|
|
|
|
|
|
|
|
|
|
s3c_rtc_tickno = platform_get_irq(pdev, 1);
|
|
|
|
|
if (s3c_rtc_tickno < 0) {
|
|
|
|
|
dev_err(&pdev->dev, "no irq for rtc tick\n");
|
|
|
|
|
return -ENOENT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
s3c_rtc_alarmno = platform_get_irq(pdev, 0);
|
|
|
|
|
if (s3c_rtc_alarmno < 0) {
|
|
|
|
|
dev_err(&pdev->dev, "no irq for alarm\n");
|
|
|
|
|
return -ENOENT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
|
|
|
|
|
s3c_rtc_tickno, s3c_rtc_alarmno);
|
|
|
|
|
|
|
|
|
|
/* get the memory region */
|
|
|
|
|
|
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
|
if (res == NULL) {
|
|
|
|
|
dev_err(&pdev->dev, "failed to get memory region resource\n");
|
|
|
|
|
return -ENOENT;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
s3c_rtc_mem = request_mem_region(res->start,
|
2006-08-27 10:23:22 +02:00
|
|
|
res->end-res->start+1,
|
|
|
|
|
pdev->name);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
|
|
|
|
if (s3c_rtc_mem == NULL) {
|
|
|
|
|
dev_err(&pdev->dev, "failed to reserve memory region\n");
|
|
|
|
|
ret = -ENOENT;
|
|
|
|
|
goto err_nores;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
|
|
|
|
|
if (s3c_rtc_base == NULL) {
|
|
|
|
|
dev_err(&pdev->dev, "failed ioremap()\n");
|
|
|
|
|
ret = -EINVAL;
|
|
|
|
|
goto err_nomap;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* check to see if everything is setup correctly */
|
|
|
|
|
|
|
|
|
|
s3c_rtc_enable(pdev, 1);
|
|
|
|
|
|
2006-08-27 10:23:22 +02:00
|
|
|
pr_debug("s3c2410_rtc: RTCCON=%02x\n",
|
|
|
|
|
readb(s3c_rtc_base + S3C2410_RTCCON));
|
2006-07-01 13:36:26 +02:00
|
|
|
|
2008-07-24 06:30:45 +02:00
|
|
|
s3c_rtc_setfreq(&pdev->dev, 1);
|
2006-07-01 13:36:26 +02:00
|
|
|
|
2008-10-29 22:01:16 +01:00
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
|
|
2006-07-01 13:36:26 +02:00
|
|
|
/* register RTC and exit */
|
|
|
|
|
|
|
|
|
|
rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
|
|
|
|
|
THIS_MODULE);
|
|
|
|
|
|
|
|
|
|
if (IS_ERR(rtc)) {
|
|
|
|
|
dev_err(&pdev->dev, "cannot attach rtc\n");
|
|
|
|
|
ret = PTR_ERR(rtc);
|
|
|
|
|
goto err_nortc;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
rtc->max_user_freq = 128;
|
|
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, rtc);
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
err_nortc:
|
|
|
|
|
s3c_rtc_enable(pdev, 0);
|
|
|
|
|
iounmap(s3c_rtc_base);
|
|
|
|
|
|
|
|
|
|
err_nomap:
|
|
|
|
|
release_resource(s3c_rtc_mem);
|
|
|
|
|
|
|
|
|
|
err_nores:
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
|
|
|
|
|
|
/* RTC Power management control */
|
|
|
|
|
|
|
|
|
|
static int ticnt_save;
|
|
|
|
|
|
|
|
|
|
static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
|
|
|
|
|
{
|
|
|
|
|
/* save TICNT for anyone using periodic interrupts */
|
2006-08-27 10:23:22 +02:00
|
|
|
ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
|
2006-07-01 13:36:26 +02:00
|
|
|
s3c_rtc_enable(pdev, 0);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int s3c_rtc_resume(struct platform_device *pdev)
|
|
|
|
|
{
|
|
|
|
|
s3c_rtc_enable(pdev, 1);
|
2006-08-27 10:23:22 +02:00
|
|
|
writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
|
2006-07-01 13:36:26 +02:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
#define s3c_rtc_suspend NULL
|
|
|
|
|
#define s3c_rtc_resume NULL
|
|
|
|
|
#endif
|
|
|
|
|
|
2008-10-29 22:00:59 +01:00
|
|
|
static struct platform_driver s3c2410_rtc_driver = {
|
2006-07-01 13:36:26 +02:00
|
|
|
.probe = s3c_rtc_probe,
|
2008-07-24 06:30:44 +02:00
|
|
|
.remove = __devexit_p(s3c_rtc_remove),
|
2006-07-01 13:36:26 +02:00
|
|
|
.suspend = s3c_rtc_suspend,
|
|
|
|
|
.resume = s3c_rtc_resume,
|
|
|
|
|
.driver = {
|
|
|
|
|
.name = "s3c2410-rtc",
|
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
|
},
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
|
|
|
|
|
|
|
|
|
|
static int __init s3c_rtc_init(void)
|
|
|
|
|
{
|
|
|
|
|
printk(banner);
|
2008-10-29 22:00:59 +01:00
|
|
|
return platform_driver_register(&s3c2410_rtc_driver);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __exit s3c_rtc_exit(void)
|
|
|
|
|
{
|
2008-10-29 22:00:59 +01:00
|
|
|
platform_driver_unregister(&s3c2410_rtc_driver);
|
2006-07-01 13:36:26 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
module_init(s3c_rtc_init);
|
|
|
|
|
module_exit(s3c_rtc_exit);
|
|
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Samsung S3C RTC Driver");
|
|
|
|
|
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
|
|
|
|
MODULE_LICENSE("GPL");
|
2008-04-11 06:29:25 +02:00
|
|
|
MODULE_ALIAS("platform:s3c2410-rtc");
|