Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-01 09:41:44 +00:00
Code Issues Packages Projects Releases Wiki Activity
7c4f77801f
linux/drivers/rtc/rtc-nuc900.c
Tejun Heo 5a0e3ad6af 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>
2010-03-30 22:02:32 +09:00

344 lines
8.3 KiB
C
Raw Blame History

/*
* Copyright (c) 2008-2009 Nuvoton technology corporation.
*
* Wan ZongShun <mcuos.com@gmail.com>
*
* 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;version 2 of the License.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/bcd.h>
/* RTC Control Registers */
#define REG_RTC_INIR 0x00
#define REG_RTC_AER 0x04
#define REG_RTC_FCR 0x08
#define REG_RTC_TLR 0x0C
#define REG_RTC_CLR 0x10
#define REG_RTC_TSSR 0x14
#define REG_RTC_DWR 0x18
#define REG_RTC_TAR 0x1C
#define REG_RTC_CAR 0x20
#define REG_RTC_LIR 0x24
#define REG_RTC_RIER 0x28
#define REG_RTC_RIIR 0x2C
#define REG_RTC_TTR 0x30
#define RTCSET 0x01
#define AERRWENB 0x10000
#define INIRRESET 0xa5eb1357
#define AERPOWERON 0xA965
#define AERPOWEROFF 0x0000
#define LEAPYEAR 0x0001
#define TICKENB 0x80
#define TICKINTENB 0x0002
#define ALARMINTENB 0x0001
#define MODE24 0x0001
struct nuc900_rtc {
int irq_num;
void __iomem *rtc_reg;
struct rtc_device *rtcdev;
};
struct nuc900_bcd_time {
int bcd_sec;
int bcd_min;
int bcd_hour;
int bcd_mday;
int bcd_mon;
int bcd_year;
};
static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc)
{
struct nuc900_rtc *rtc = _rtc;
unsigned long events = 0, rtc_irq;
rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR);
if (rtc_irq & ALARMINTENB) {
rtc_irq &= ~ALARMINTENB;
__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
events |= RTC_AF | RTC_IRQF;
}
if (rtc_irq & TICKINTENB) {
rtc_irq &= ~TICKINTENB;
__raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR);
events |= RTC_UF | RTC_IRQF;
}
rtc_update_irq(rtc->rtcdev, 1, events);
return IRQ_HANDLED;
}
static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc)
{
unsigned int i;
__raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR);
mdelay(10);
__raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER);
for (i = 0; i < 1000; i++) {
if (__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB)
return 0;
}
if ((__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) == 0x0)
return ERR_PTR(-ENODEV);
return ERR_PTR(-EPERM);
}
static void nuc900_rtc_bcd2bin(unsigned int timereg,
unsigned int calreg, struct rtc_time *tm)
{
tm->tm_mday = bcd2bin(calreg >> 0);
tm->tm_mon = bcd2bin(calreg >> 8);
tm->tm_year = bcd2bin(calreg >> 16) + 100;
tm->tm_sec = bcd2bin(timereg >> 0);
tm->tm_min = bcd2bin(timereg >> 8);
tm->tm_hour = bcd2bin(timereg >> 16);
rtc_valid_tm(tm);
}
static void nuc900_rtc_bin2bcd(struct rtc_time *settm,
struct nuc900_bcd_time *gettm)
{
gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0;
gettm->bcd_mon = bin2bcd(settm->tm_mon) << 8;
gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16;
gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0;
gettm->bcd_min = bin2bcd(settm->tm_min) << 8;
gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16;
}
static int nuc900_update_irq_enable(struct device *dev, unsigned int enabled)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
if (enabled)
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
(TICKINTENB), rtc->rtc_reg + REG_RTC_RIER);
else
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&
(~TICKINTENB), rtc->rtc_reg + REG_RTC_RIER);
return 0;
}
static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
if (enabled)
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)|
(ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
else
__raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)&
(~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER);
return 0;
}
static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
unsigned int timeval, clrval;
timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR);
clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR);
nuc900_rtc_bcd2bin(timeval, clrval, tm);
return 0;
}
static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
struct nuc900_bcd_time gettm;
unsigned long val;
int *err;
nuc900_rtc_bin2bcd(tm, &gettm);
err = check_rtc_access_enable(rtc);
if (IS_ERR(err))
return PTR_ERR(err);
val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year;
__raw_writel(val, rtc->rtc_reg + REG_RTC_CLR);
val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour;
__raw_writel(val, rtc->rtc_reg + REG_RTC_TLR);
return 0;
}
static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
unsigned int timeval, carval;
timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR);
carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR);
nuc900_rtc_bcd2bin(timeval, carval, &alrm->time);
return 0;
}
static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct nuc900_rtc *rtc = dev_get_drvdata(dev);
struct nuc900_bcd_time tm;
unsigned long val;
int *err;
nuc900_rtc_bin2bcd(&alrm->time, &tm);
err = check_rtc_access_enable(rtc);
if (IS_ERR(err))
return PTR_ERR(err);
val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year;
__raw_writel(val, rtc->rtc_reg + REG_RTC_CAR);
val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour;
__raw_writel(val, rtc->rtc_reg + REG_RTC_TAR);
return 0;
}
static struct rtc_class_ops nuc900_rtc_ops = {
.read_time = nuc900_rtc_read_time,
.set_time = nuc900_rtc_set_time,
.read_alarm = nuc900_rtc_read_alarm,
.set_alarm = nuc900_rtc_set_alarm,
.alarm_irq_enable = nuc900_alarm_irq_enable,
.update_irq_enable = nuc900_update_irq_enable,
};
static int __devinit nuc900_rtc_probe(struct platform_device *pdev)
{
struct resource *res;
struct nuc900_rtc *nuc900_rtc;
int err = 0;
nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL);
if (!nuc900_rtc) {
dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n");
return -ENOMEM;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "platform_get_resource failed\n");
err = -ENXIO;
goto fail1;
}
if (!request_mem_region(res->start, resource_size(res),
pdev->name)) {
dev_err(&pdev->dev, "request_mem_region failed\n");
err = -EBUSY;
goto fail1;
}
nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res));
if (!nuc900_rtc->rtc_reg) {
dev_err(&pdev->dev, "ioremap rtc_reg failed\n");
err = -ENOMEM;
goto fail2;
}
nuc900_rtc->irq_num = platform_get_irq(pdev, 0);
if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt,
IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) {
dev_err(&pdev->dev, "NUC900 RTC request irq failed\n");
err = -EBUSY;
goto fail3;
}
nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
&nuc900_rtc_ops, THIS_MODULE);
if (IS_ERR(nuc900_rtc->rtcdev)) {
dev_err(&pdev->dev, "rtc device register faild\n");
err = PTR_ERR(nuc900_rtc->rtcdev);
goto fail4;
}
platform_set_drvdata(pdev, nuc900_rtc);
__raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24,
nuc900_rtc->rtc_reg + REG_RTC_TSSR);
return 0;
fail4: free_irq(nuc900_rtc->irq_num, nuc900_rtc);
fail3: iounmap(nuc900_rtc->rtc_reg);
fail2: release_mem_region(res->start, resource_size(res));
fail1: kfree(nuc900_rtc);
return err;
}
static int __devexit nuc900_rtc_remove(struct platform_device *pdev)
{
struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev);
struct resource *res;
rtc_device_unregister(nuc900_rtc->rtcdev);
free_irq(nuc900_rtc->irq_num, nuc900_rtc);
iounmap(nuc900_rtc->rtc_reg);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
kfree(nuc900_rtc);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver nuc900_rtc_driver = {
.remove = __devexit_p(nuc900_rtc_remove),
.driver = {
.name = "nuc900-rtc",
.owner = THIS_MODULE,
},
};
static int __init nuc900_rtc_init(void)
{
return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe);
}
static void __exit nuc900_rtc_exit(void)
{
platform_driver_unregister(&nuc900_rtc_driver);
}
module_init(nuc900_rtc_init);
module_exit(nuc900_rtc_exit);
MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("nuc910/nuc920 RTC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-rtc");
Reference in New Issue View Git Blame Copy Permalink