linux/drivers/rtc/rtc-at32ap700x.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

327 lines
7.4 KiB
C

/*
* An RTC driver for the AVR32 AT32AP700x processor series.
*
* Copyright (C) 2007 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/io.h>
/*
* This is a bare-bones RTC. It runs during most system sleep states, but has
* no battery backup and gets reset during system restart. It must be
* initialized from an external clock (network, I2C, etc) before it can be of
* much use.
*
* The alarm functionality is limited by the hardware, not supporting
* periodic interrupts.
*/
#define RTC_CTRL 0x00
#define RTC_CTRL_EN 0
#define RTC_CTRL_PCLR 1
#define RTC_CTRL_TOPEN 2
#define RTC_CTRL_PSEL 8
#define RTC_VAL 0x04
#define RTC_TOP 0x08
#define RTC_IER 0x10
#define RTC_IER_TOPI 0
#define RTC_IDR 0x14
#define RTC_IDR_TOPI 0
#define RTC_IMR 0x18
#define RTC_IMR_TOPI 0
#define RTC_ISR 0x1c
#define RTC_ISR_TOPI 0
#define RTC_ICR 0x20
#define RTC_ICR_TOPI 0
#define RTC_BIT(name) (1 << RTC_##name)
#define RTC_BF(name, value) ((value) << RTC_##name)
#define rtc_readl(dev, reg) \
__raw_readl((dev)->regs + RTC_##reg)
#define rtc_writel(dev, reg, value) \
__raw_writel((value), (dev)->regs + RTC_##reg)
struct rtc_at32ap700x {
struct rtc_device *rtc;
void __iomem *regs;
unsigned long alarm_time;
unsigned long irq;
/* Protect against concurrent register access. */
spinlock_t lock;
};
static int at32_rtc_readtime(struct device *dev, struct rtc_time *tm)
{
struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
unsigned long now;
now = rtc_readl(rtc, VAL);
rtc_time_to_tm(now, tm);
return 0;
}
static int at32_rtc_settime(struct device *dev, struct rtc_time *tm)
{
struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
unsigned long now;
int ret;
ret = rtc_tm_to_time(tm, &now);
if (ret == 0)
rtc_writel(rtc, VAL, now);
return ret;
}
static int at32_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
spin_lock_irq(&rtc->lock);
rtc_time_to_tm(rtc->alarm_time, &alrm->time);
alrm->enabled = rtc_readl(rtc, IMR) & RTC_BIT(IMR_TOPI) ? 1 : 0;
alrm->pending = rtc_readl(rtc, ISR) & RTC_BIT(ISR_TOPI) ? 1 : 0;
spin_unlock_irq(&rtc->lock);
return 0;
}
static int at32_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
unsigned long rtc_unix_time;
unsigned long alarm_unix_time;
int ret;
rtc_unix_time = rtc_readl(rtc, VAL);
ret = rtc_tm_to_time(&alrm->time, &alarm_unix_time);
if (ret)
return ret;
if (alarm_unix_time < rtc_unix_time)
return -EINVAL;
spin_lock_irq(&rtc->lock);
rtc->alarm_time = alarm_unix_time;
rtc_writel(rtc, TOP, rtc->alarm_time);
if (alrm->enabled)
rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
| RTC_BIT(CTRL_TOPEN));
else
rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
& ~RTC_BIT(CTRL_TOPEN));
spin_unlock_irq(&rtc->lock);
return ret;
}
static int at32_rtc_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
int ret = 0;
spin_lock_irq(&rtc->lock);
switch (cmd) {
case RTC_AIE_ON:
if (rtc_readl(rtc, VAL) > rtc->alarm_time) {
ret = -EINVAL;
break;
}
rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
| RTC_BIT(CTRL_TOPEN));
rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
rtc_writel(rtc, IER, RTC_BIT(IER_TOPI));
break;
case RTC_AIE_OFF:
rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
& ~RTC_BIT(CTRL_TOPEN));
rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
break;
default:
ret = -ENOIOCTLCMD;
break;
}
spin_unlock_irq(&rtc->lock);
return ret;
}
static irqreturn_t at32_rtc_interrupt(int irq, void *dev_id)
{
struct rtc_at32ap700x *rtc = (struct rtc_at32ap700x *)dev_id;
unsigned long isr = rtc_readl(rtc, ISR);
unsigned long events = 0;
int ret = IRQ_NONE;
spin_lock(&rtc->lock);
if (isr & RTC_BIT(ISR_TOPI)) {
rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
& ~RTC_BIT(CTRL_TOPEN));
rtc_writel(rtc, VAL, rtc->alarm_time);
events = RTC_AF | RTC_IRQF;
rtc_update_irq(rtc->rtc, 1, events);
ret = IRQ_HANDLED;
}
spin_unlock(&rtc->lock);
return ret;
}
static struct rtc_class_ops at32_rtc_ops = {
.ioctl = at32_rtc_ioctl,
.read_time = at32_rtc_readtime,
.set_time = at32_rtc_settime,
.read_alarm = at32_rtc_readalarm,
.set_alarm = at32_rtc_setalarm,
};
static int __init at32_rtc_probe(struct platform_device *pdev)
{
struct resource *regs;
struct rtc_at32ap700x *rtc;
int irq;
int ret;
rtc = kzalloc(sizeof(struct rtc_at32ap700x), GFP_KERNEL);
if (!rtc) {
dev_dbg(&pdev->dev, "out of memory\n");
return -ENOMEM;
}
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
dev_dbg(&pdev->dev, "no mmio resource defined\n");
ret = -ENXIO;
goto out;
}
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
dev_dbg(&pdev->dev, "could not get irq\n");
ret = -ENXIO;
goto out;
}
rtc->irq = irq;
rtc->regs = ioremap(regs->start, regs->end - regs->start + 1);
if (!rtc->regs) {
ret = -ENOMEM;
dev_dbg(&pdev->dev, "could not map I/O memory\n");
goto out;
}
spin_lock_init(&rtc->lock);
/*
* Maybe init RTC: count from zero at 1 Hz, disable wrap irq.
*
* Do not reset VAL register, as it can hold an old time
* from last JTAG reset.
*/
if (!(rtc_readl(rtc, CTRL) & RTC_BIT(CTRL_EN))) {
rtc_writel(rtc, CTRL, RTC_BIT(CTRL_PCLR));
rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
rtc_writel(rtc, CTRL, RTC_BF(CTRL_PSEL, 0xe)
| RTC_BIT(CTRL_EN));
}
ret = request_irq(irq, at32_rtc_interrupt, IRQF_SHARED, "rtc", rtc);
if (ret) {
dev_dbg(&pdev->dev, "could not request irq %d\n", irq);
goto out_iounmap;
}
platform_set_drvdata(pdev, rtc);
rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
&at32_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc->rtc)) {
dev_dbg(&pdev->dev, "could not register rtc device\n");
ret = PTR_ERR(rtc->rtc);
goto out_free_irq;
}
device_init_wakeup(&pdev->dev, 1);
dev_info(&pdev->dev, "Atmel RTC for AT32AP700x at %08lx irq %ld\n",
(unsigned long)rtc->regs, rtc->irq);
return 0;
out_free_irq:
platform_set_drvdata(pdev, NULL);
free_irq(irq, rtc);
out_iounmap:
iounmap(rtc->regs);
out:
kfree(rtc);
return ret;
}
static int __exit at32_rtc_remove(struct platform_device *pdev)
{
struct rtc_at32ap700x *rtc = platform_get_drvdata(pdev);
device_init_wakeup(&pdev->dev, 0);
free_irq(rtc->irq, rtc);
iounmap(rtc->regs);
rtc_device_unregister(rtc->rtc);
kfree(rtc);
platform_set_drvdata(pdev, NULL);
return 0;
}
MODULE_ALIAS("platform:at32ap700x_rtc");
static struct platform_driver at32_rtc_driver = {
.remove = __exit_p(at32_rtc_remove),
.driver = {
.name = "at32ap700x_rtc",
.owner = THIS_MODULE,
},
};
static int __init at32_rtc_init(void)
{
return platform_driver_probe(&at32_rtc_driver, at32_rtc_probe);
}
module_init(at32_rtc_init);
static void __exit at32_rtc_exit(void)
{
platform_driver_unregister(&at32_rtc_driver);
}
module_exit(at32_rtc_exit);
MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
MODULE_DESCRIPTION("Real time clock for AVR32 AT32AP700x");
MODULE_LICENSE("GPL");