linux/drivers/clocksource/sh_tmu.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

465 lines
11 KiB
C

/*
* SuperH Timer Support - TMU
*
* Copyright (C) 2009 Magnus Damm
*
* 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; either version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/err.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/sh_timer.h>
#include <linux/slab.h>
struct sh_tmu_priv {
void __iomem *mapbase;
struct clk *clk;
struct irqaction irqaction;
struct platform_device *pdev;
unsigned long rate;
unsigned long periodic;
struct clock_event_device ced;
struct clocksource cs;
};
static DEFINE_SPINLOCK(sh_tmu_lock);
#define TSTR -1 /* shared register */
#define TCOR 0 /* channel register */
#define TCNT 1 /* channel register */
#define TCR 2 /* channel register */
static inline unsigned long sh_tmu_read(struct sh_tmu_priv *p, int reg_nr)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
void __iomem *base = p->mapbase;
unsigned long offs;
if (reg_nr == TSTR)
return ioread8(base - cfg->channel_offset);
offs = reg_nr << 2;
if (reg_nr == TCR)
return ioread16(base + offs);
else
return ioread32(base + offs);
}
static inline void sh_tmu_write(struct sh_tmu_priv *p, int reg_nr,
unsigned long value)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
void __iomem *base = p->mapbase;
unsigned long offs;
if (reg_nr == TSTR) {
iowrite8(value, base - cfg->channel_offset);
return;
}
offs = reg_nr << 2;
if (reg_nr == TCR)
iowrite16(value, base + offs);
else
iowrite32(value, base + offs);
}
static void sh_tmu_start_stop_ch(struct sh_tmu_priv *p, int start)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
unsigned long flags, value;
/* start stop register shared by multiple timer channels */
spin_lock_irqsave(&sh_tmu_lock, flags);
value = sh_tmu_read(p, TSTR);
if (start)
value |= 1 << cfg->timer_bit;
else
value &= ~(1 << cfg->timer_bit);
sh_tmu_write(p, TSTR, value);
spin_unlock_irqrestore(&sh_tmu_lock, flags);
}
static int sh_tmu_enable(struct sh_tmu_priv *p)
{
struct sh_timer_config *cfg = p->pdev->dev.platform_data;
int ret;
/* enable clock */
ret = clk_enable(p->clk);
if (ret) {
pr_err("sh_tmu: cannot enable clock \"%s\"\n", cfg->clk);
return ret;
}
/* make sure channel is disabled */
sh_tmu_start_stop_ch(p, 0);
/* maximum timeout */
sh_tmu_write(p, TCOR, 0xffffffff);
sh_tmu_write(p, TCNT, 0xffffffff);
/* configure channel to parent clock / 4, irq off */
p->rate = clk_get_rate(p->clk) / 4;
sh_tmu_write(p, TCR, 0x0000);
/* enable channel */
sh_tmu_start_stop_ch(p, 1);
return 0;
}
static void sh_tmu_disable(struct sh_tmu_priv *p)
{
/* disable channel */
sh_tmu_start_stop_ch(p, 0);
/* disable interrupts in TMU block */
sh_tmu_write(p, TCR, 0x0000);
/* stop clock */
clk_disable(p->clk);
}
static void sh_tmu_set_next(struct sh_tmu_priv *p, unsigned long delta,
int periodic)
{
/* stop timer */
sh_tmu_start_stop_ch(p, 0);
/* acknowledge interrupt */
sh_tmu_read(p, TCR);
/* enable interrupt */
sh_tmu_write(p, TCR, 0x0020);
/* reload delta value in case of periodic timer */
if (periodic)
sh_tmu_write(p, TCOR, delta);
else
sh_tmu_write(p, TCOR, 0xffffffff);
sh_tmu_write(p, TCNT, delta);
/* start timer */
sh_tmu_start_stop_ch(p, 1);
}
static irqreturn_t sh_tmu_interrupt(int irq, void *dev_id)
{
struct sh_tmu_priv *p = dev_id;
/* disable or acknowledge interrupt */
if (p->ced.mode == CLOCK_EVT_MODE_ONESHOT)
sh_tmu_write(p, TCR, 0x0000);
else
sh_tmu_write(p, TCR, 0x0020);
/* notify clockevent layer */
p->ced.event_handler(&p->ced);
return IRQ_HANDLED;
}
static struct sh_tmu_priv *cs_to_sh_tmu(struct clocksource *cs)
{
return container_of(cs, struct sh_tmu_priv, cs);
}
static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
{
struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
return sh_tmu_read(p, TCNT) ^ 0xffffffff;
}
static int sh_tmu_clocksource_enable(struct clocksource *cs)
{
struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
int ret;
ret = sh_tmu_enable(p);
if (ret)
return ret;
/* TODO: calculate good shift from rate and counter bit width */
cs->shift = 10;
cs->mult = clocksource_hz2mult(p->rate, cs->shift);
return 0;
}
static void sh_tmu_clocksource_disable(struct clocksource *cs)
{
sh_tmu_disable(cs_to_sh_tmu(cs));
}
static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
char *name, unsigned long rating)
{
struct clocksource *cs = &p->cs;
cs->name = name;
cs->rating = rating;
cs->read = sh_tmu_clocksource_read;
cs->enable = sh_tmu_clocksource_enable;
cs->disable = sh_tmu_clocksource_disable;
cs->mask = CLOCKSOURCE_MASK(32);
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
pr_info("sh_tmu: %s used as clock source\n", cs->name);
clocksource_register(cs);
return 0;
}
static struct sh_tmu_priv *ced_to_sh_tmu(struct clock_event_device *ced)
{
return container_of(ced, struct sh_tmu_priv, ced);
}
static void sh_tmu_clock_event_start(struct sh_tmu_priv *p, int periodic)
{
struct clock_event_device *ced = &p->ced;
sh_tmu_enable(p);
/* TODO: calculate good shift from rate and counter bit width */
ced->shift = 32;
ced->mult = div_sc(p->rate, NSEC_PER_SEC, ced->shift);
ced->max_delta_ns = clockevent_delta2ns(0xffffffff, ced);
ced->min_delta_ns = 5000;
if (periodic) {
p->periodic = (p->rate + HZ/2) / HZ;
sh_tmu_set_next(p, p->periodic, 1);
}
}
static void sh_tmu_clock_event_mode(enum clock_event_mode mode,
struct clock_event_device *ced)
{
struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
int disabled = 0;
/* deal with old setting first */
switch (ced->mode) {
case CLOCK_EVT_MODE_PERIODIC:
case CLOCK_EVT_MODE_ONESHOT:
sh_tmu_disable(p);
disabled = 1;
break;
default:
break;
}
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
pr_info("sh_tmu: %s used for periodic clock events\n",
ced->name);
sh_tmu_clock_event_start(p, 1);
break;
case CLOCK_EVT_MODE_ONESHOT:
pr_info("sh_tmu: %s used for oneshot clock events\n",
ced->name);
sh_tmu_clock_event_start(p, 0);
break;
case CLOCK_EVT_MODE_UNUSED:
if (!disabled)
sh_tmu_disable(p);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
default:
break;
}
}
static int sh_tmu_clock_event_next(unsigned long delta,
struct clock_event_device *ced)
{
struct sh_tmu_priv *p = ced_to_sh_tmu(ced);
BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT);
/* program new delta value */
sh_tmu_set_next(p, delta, 0);
return 0;
}
static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
char *name, unsigned long rating)
{
struct clock_event_device *ced = &p->ced;
int ret;
memset(ced, 0, sizeof(*ced));
ced->name = name;
ced->features = CLOCK_EVT_FEAT_PERIODIC;
ced->features |= CLOCK_EVT_FEAT_ONESHOT;
ced->rating = rating;
ced->cpumask = cpumask_of(0);
ced->set_next_event = sh_tmu_clock_event_next;
ced->set_mode = sh_tmu_clock_event_mode;
pr_info("sh_tmu: %s used for clock events\n", ced->name);
clockevents_register_device(ced);
ret = setup_irq(p->irqaction.irq, &p->irqaction);
if (ret) {
pr_err("sh_tmu: failed to request irq %d\n",
p->irqaction.irq);
return;
}
}
static int sh_tmu_register(struct sh_tmu_priv *p, char *name,
unsigned long clockevent_rating,
unsigned long clocksource_rating)
{
if (clockevent_rating)
sh_tmu_register_clockevent(p, name, clockevent_rating);
else if (clocksource_rating)
sh_tmu_register_clocksource(p, name, clocksource_rating);
return 0;
}
static int sh_tmu_setup(struct sh_tmu_priv *p, struct platform_device *pdev)
{
struct sh_timer_config *cfg = pdev->dev.platform_data;
struct resource *res;
int irq, ret;
ret = -ENXIO;
memset(p, 0, sizeof(*p));
p->pdev = pdev;
if (!cfg) {
dev_err(&p->pdev->dev, "missing platform data\n");
goto err0;
}
platform_set_drvdata(pdev, p);
res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&p->pdev->dev, "failed to get I/O memory\n");
goto err0;
}
irq = platform_get_irq(p->pdev, 0);
if (irq < 0) {
dev_err(&p->pdev->dev, "failed to get irq\n");
goto err0;
}
/* map memory, let mapbase point to our channel */
p->mapbase = ioremap_nocache(res->start, resource_size(res));
if (p->mapbase == NULL) {
pr_err("sh_tmu: failed to remap I/O memory\n");
goto err0;
}
/* setup data for setup_irq() (too early for request_irq()) */
p->irqaction.name = cfg->name;
p->irqaction.handler = sh_tmu_interrupt;
p->irqaction.dev_id = p;
p->irqaction.irq = irq;
p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL;
/* get hold of clock */
p->clk = clk_get(&p->pdev->dev, cfg->clk);
if (IS_ERR(p->clk)) {
pr_err("sh_tmu: cannot get clock \"%s\"\n", cfg->clk);
ret = PTR_ERR(p->clk);
goto err1;
}
return sh_tmu_register(p, cfg->name,
cfg->clockevent_rating,
cfg->clocksource_rating);
err1:
iounmap(p->mapbase);
err0:
return ret;
}
static int __devinit sh_tmu_probe(struct platform_device *pdev)
{
struct sh_tmu_priv *p = platform_get_drvdata(pdev);
struct sh_timer_config *cfg = pdev->dev.platform_data;
int ret;
if (p) {
pr_info("sh_tmu: %s kept as earlytimer\n", cfg->name);
return 0;
}
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (p == NULL) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
return -ENOMEM;
}
ret = sh_tmu_setup(p, pdev);
if (ret) {
kfree(p);
platform_set_drvdata(pdev, NULL);
}
return ret;
}
static int __devexit sh_tmu_remove(struct platform_device *pdev)
{
return -EBUSY; /* cannot unregister clockevent and clocksource */
}
static struct platform_driver sh_tmu_device_driver = {
.probe = sh_tmu_probe,
.remove = __devexit_p(sh_tmu_remove),
.driver = {
.name = "sh_tmu",
}
};
static int __init sh_tmu_init(void)
{
return platform_driver_register(&sh_tmu_device_driver);
}
static void __exit sh_tmu_exit(void)
{
platform_driver_unregister(&sh_tmu_device_driver);
}
early_platform_init("earlytimer", &sh_tmu_device_driver);
module_init(sh_tmu_init);
module_exit(sh_tmu_exit);
MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("SuperH TMU Timer Driver");
MODULE_LICENSE("GPL v2");