linux/arch/mips/rb532/irq.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

236 lines
5.9 KiB
C

/*
* 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, or (at your
* option) any later version.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Copyright 2002 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* stevel@mvista.com or source@mvista.com
*/
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/random.h>
#include <linux/delay.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/mach-rc32434/irq.h>
#include <asm/mach-rc32434/gpio.h>
struct intr_group {
u32 mask; /* mask of valid bits in pending/mask registers */
volatile u32 *base_addr;
};
#define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32)
#if (NR_IRQS < RC32434_NR_IRQS)
#error Too little irqs defined. Did you override <asm/irq.h> ?
#endif
static const struct intr_group intr_group[NUM_INTR_GROUPS] = {
{
.mask = 0x0000efff,
.base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)},
{
.mask = 0x00001fff,
.base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)},
{
.mask = 0x00000007,
.base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)},
{
.mask = 0x0003ffff,
.base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)},
{
.mask = 0xffffffff,
.base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)}
};
#define READ_PEND(base) (*(base))
#define READ_MASK(base) (*(base + 2))
#define WRITE_MASK(base, val) (*(base + 2) = (val))
static inline int irq_to_group(unsigned int irq_nr)
{
return (irq_nr - GROUP0_IRQ_BASE) >> 5;
}
static inline int group_to_ip(unsigned int group)
{
return group + 2;
}
static inline void enable_local_irq(unsigned int ip)
{
int ipnum = 0x100 << ip;
set_c0_status(ipnum);
}
static inline void disable_local_irq(unsigned int ip)
{
int ipnum = 0x100 << ip;
clear_c0_status(ipnum);
}
static inline void ack_local_irq(unsigned int ip)
{
int ipnum = 0x100 << ip;
clear_c0_cause(ipnum);
}
static void rb532_enable_irq(unsigned int irq_nr)
{
int ip = irq_nr - GROUP0_IRQ_BASE;
unsigned int group, intr_bit;
volatile unsigned int *addr;
if (ip < 0)
enable_local_irq(irq_nr);
else {
group = ip >> 5;
ip &= (1 << 5) - 1;
intr_bit = 1 << ip;
enable_local_irq(group_to_ip(group));
addr = intr_group[group].base_addr;
WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit);
}
}
static void rb532_disable_irq(unsigned int irq_nr)
{
int ip = irq_nr - GROUP0_IRQ_BASE;
unsigned int group, intr_bit, mask;
volatile unsigned int *addr;
if (ip < 0) {
disable_local_irq(irq_nr);
} else {
group = ip >> 5;
ip &= (1 << 5) - 1;
intr_bit = 1 << ip;
addr = intr_group[group].base_addr;
mask = READ_MASK(addr);
mask |= intr_bit;
WRITE_MASK(addr, mask);
/* There is a maximum of 14 GPIO interrupts */
if (group == GPIO_MAPPED_IRQ_GROUP && irq_nr <= (GROUP4_IRQ_BASE + 13))
rb532_gpio_set_istat(0, irq_nr - GPIO_MAPPED_IRQ_BASE);
/*
* if there are no more interrupts enabled in this
* group, disable corresponding IP
*/
if (mask == intr_group[group].mask)
disable_local_irq(group_to_ip(group));
}
}
static void rb532_mask_and_ack_irq(unsigned int irq_nr)
{
rb532_disable_irq(irq_nr);
ack_local_irq(group_to_ip(irq_to_group(irq_nr)));
}
static int rb532_set_type(unsigned int irq_nr, unsigned type)
{
int gpio = irq_nr - GPIO_MAPPED_IRQ_BASE;
int group = irq_to_group(irq_nr);
if (group != GPIO_MAPPED_IRQ_GROUP || irq_nr > (GROUP4_IRQ_BASE + 13))
return (type == IRQ_TYPE_LEVEL_HIGH) ? 0 : -EINVAL;
switch (type) {
case IRQ_TYPE_LEVEL_HIGH:
rb532_gpio_set_ilevel(1, gpio);
break;
case IRQ_TYPE_LEVEL_LOW:
rb532_gpio_set_ilevel(0, gpio);
break;
default:
return -EINVAL;
}
return 0;
}
static struct irq_chip rc32434_irq_type = {
.name = "RB532",
.ack = rb532_disable_irq,
.mask = rb532_disable_irq,
.mask_ack = rb532_mask_and_ack_irq,
.unmask = rb532_enable_irq,
.set_type = rb532_set_type,
};
void __init arch_init_irq(void)
{
int i;
pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS);
for (i = 0; i < RC32434_NR_IRQS; i++)
set_irq_chip_and_handler(i, &rc32434_irq_type,
handle_level_irq);
}
/* Main Interrupt dispatcher */
asmlinkage void plat_irq_dispatch(void)
{
unsigned int ip, pend, group;
volatile unsigned int *addr;
unsigned int cp0_cause = read_c0_cause() & read_c0_status();
if (cp0_cause & CAUSEF_IP7) {
do_IRQ(7);
} else {
ip = (cp0_cause & 0x7c00);
if (ip) {
group = 21 + (fls(ip) - 32);
addr = intr_group[group].base_addr;
pend = READ_PEND(addr);
pend &= ~READ_MASK(addr); /* only unmasked interrupts */
pend = 39 + (fls(pend) - 32);
do_IRQ((group << 5) + pend);
}
}
}