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![Tejun Heo](/assets/img/avatar_default.png)
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>
305 lines
7.7 KiB
C
305 lines
7.7 KiB
C
/*
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* Freescale STMP37XX/STMP378X Real Time Clock driver
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*
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* Copyright (c) 2007 Sigmatel, Inc.
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* Peter Hartley, <peter.hartley@sigmatel.com>
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*
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* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
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*/
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/*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/kernel.h>
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#include <linux/module.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/slab.h>
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#include <mach/platform.h>
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#include <mach/stmp3xxx.h>
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#include <mach/regs-rtc.h>
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struct stmp3xxx_rtc_data {
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struct rtc_device *rtc;
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unsigned irq_count;
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void __iomem *io;
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int irq_alarm, irq_1msec;
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};
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static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
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{
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/*
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* The datasheet doesn't say which way round the
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* NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
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* 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
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*/
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while (__raw_readl(rtc_data->io + HW_RTC_STAT) &
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BF(0x80, RTC_STAT_STALE_REGS))
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cpu_relax();
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}
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/* Time read/write */
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static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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stmp3xxx_wait_time(rtc_data);
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rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm);
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return 0;
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}
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static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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__raw_writel(t, rtc_data->io + HW_RTC_SECONDS);
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stmp3xxx_wait_time(rtc_data);
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return 0;
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}
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/* interrupt(s) handler */
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static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
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u32 status;
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u32 events = 0;
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status = __raw_readl(rtc_data->io + HW_RTC_CTRL) &
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(BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ);
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if (status & BM_RTC_CTRL_ALARM_IRQ) {
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stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ,
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rtc_data->io + HW_RTC_CTRL);
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events |= RTC_AF | RTC_IRQF;
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}
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if (status & BM_RTC_CTRL_ONEMSEC_IRQ) {
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ,
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rtc_data->io + HW_RTC_CTRL);
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if (++rtc_data->irq_count % 1000 == 0) {
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events |= RTC_UF | RTC_IRQF;
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rtc_data->irq_count = 0;
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}
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}
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if (events)
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rtc_update_irq(rtc_data->rtc, 1, events);
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return IRQ_HANDLED;
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}
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static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0,
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*ctl = rtc_data->io + HW_RTC_CTRL;
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if (enabled) {
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stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
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stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
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} else {
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stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
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stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
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}
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return 0;
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}
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static int stmp3xxx_update_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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if (enabled)
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stmp3xxx_setl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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else
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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return 0;
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}
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static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time);
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return 0;
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}
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static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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unsigned long t;
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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rtc_tm_to_time(&alm->time, &t);
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__raw_writel(t, rtc_data->io + HW_RTC_ALARM);
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return 0;
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}
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static struct rtc_class_ops stmp3xxx_rtc_ops = {
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.alarm_irq_enable =
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stmp3xxx_alarm_irq_enable,
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.update_irq_enable =
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stmp3xxx_update_irq_enable,
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.read_time = stmp3xxx_rtc_gettime,
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.set_mmss = stmp3xxx_rtc_set_mmss,
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.read_alarm = stmp3xxx_rtc_read_alarm,
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.set_alarm = stmp3xxx_rtc_set_alarm,
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};
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static int stmp3xxx_rtc_remove(struct platform_device *pdev)
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{
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struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);
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if (!rtc_data)
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return 0;
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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free_irq(rtc_data->irq_alarm, &pdev->dev);
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free_irq(rtc_data->irq_1msec, &pdev->dev);
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rtc_device_unregister(rtc_data->rtc);
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iounmap(rtc_data->io);
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kfree(rtc_data);
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return 0;
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}
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static int stmp3xxx_rtc_probe(struct platform_device *pdev)
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{
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struct stmp3xxx_rtc_data *rtc_data;
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struct resource *r;
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int err;
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rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
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if (!rtc_data)
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return -ENOMEM;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "failed to get resource\n");
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err = -ENXIO;
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goto out_free;
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}
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rtc_data->io = ioremap(r->start, resource_size(r));
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if (!rtc_data->io) {
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dev_err(&pdev->dev, "ioremap failed\n");
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err = -EIO;
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goto out_free;
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}
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rtc_data->irq_alarm = platform_get_irq(pdev, 0);
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rtc_data->irq_1msec = platform_get_irq(pdev, 1);
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if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) &
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BM_RTC_STAT_RTC_PRESENT)) {
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dev_err(&pdev->dev, "no device onboard\n");
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err = -ENODEV;
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goto out_remap;
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}
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stmp3xxx_reset_block(rtc_data->io, true);
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stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE,
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rtc_data->io + HW_RTC_PERSISTENT0);
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rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&stmp3xxx_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc_data->rtc)) {
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err = PTR_ERR(rtc_data->rtc);
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goto out_remap;
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}
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rtc_data->irq_count = 0;
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err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
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IRQF_DISABLED, "RTC alarm", &pdev->dev);
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if (err) {
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dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
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rtc_data->irq_alarm);
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goto out_irq_alarm;
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}
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err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
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IRQF_DISABLED, "RTC tick", &pdev->dev);
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if (err) {
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dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
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rtc_data->irq_1msec);
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goto out_irq1;
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}
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platform_set_drvdata(pdev, rtc_data);
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return 0;
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out_irq1:
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free_irq(rtc_data->irq_alarm, &pdev->dev);
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out_irq_alarm:
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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rtc_device_unregister(rtc_data->rtc);
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out_remap:
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iounmap(rtc_data->io);
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out_free:
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kfree(rtc_data);
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return err;
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}
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#ifdef CONFIG_PM
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static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
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{
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return 0;
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}
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static int stmp3xxx_rtc_resume(struct platform_device *dev)
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{
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struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);
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stmp3xxx_reset_block(rtc_data->io, true);
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stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE,
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rtc_data->io + HW_RTC_PERSISTENT0);
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return 0;
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}
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#else
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#define stmp3xxx_rtc_suspend NULL
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#define stmp3xxx_rtc_resume NULL
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#endif
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static struct platform_driver stmp3xxx_rtcdrv = {
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.probe = stmp3xxx_rtc_probe,
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.remove = stmp3xxx_rtc_remove,
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.suspend = stmp3xxx_rtc_suspend,
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.resume = stmp3xxx_rtc_resume,
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.driver = {
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.name = "stmp3xxx-rtc",
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.owner = THIS_MODULE,
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},
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};
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static int __init stmp3xxx_rtc_init(void)
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{
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return platform_driver_register(&stmp3xxx_rtcdrv);
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}
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static void __exit stmp3xxx_rtc_exit(void)
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{
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platform_driver_unregister(&stmp3xxx_rtcdrv);
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}
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module_init(stmp3xxx_rtc_init);
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module_exit(stmp3xxx_rtc_exit);
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MODULE_DESCRIPTION("STMP3xxx RTC Driver");
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MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
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MODULE_LICENSE("GPL");
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