linux/arch/arm/mach-ixp2000/pci.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

247 lines
5.3 KiB
C

/*
* arch/arm/mach-ixp2000/pci.c
*
* PCI routines for IXDP2400/IXDP2800 boards
*
* Original Author: Naeem Afzal <naeem.m.afzal@intel.com>
* Maintained by: Deepak Saxena <dsaxena@plexity.net>
*
* Copyright 2002 Intel Corp.
* Copyright (C) 2003-2004 MontaVista Software, Inc.
*
* 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.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <mach/hardware.h>
#include <asm/mach/pci.h>
static volatile int pci_master_aborts = 0;
static int clear_master_aborts(void);
u32 *
ixp2000_pci_config_addr(unsigned int bus_nr, unsigned int devfn, int where)
{
u32 *paddress;
if (PCI_SLOT(devfn) > 7)
return 0;
/* Must be dword aligned */
where &= ~3;
/*
* For top bus, generate type 0, else type 1
*/
if (!bus_nr) {
/* only bits[23:16] are used for IDSEL */
paddress = (u32 *) (IXP2000_PCI_CFG0_VIRT_BASE
| (1 << (PCI_SLOT(devfn) + 16))
| (PCI_FUNC(devfn) << 8) | where);
} else {
paddress = (u32 *) (IXP2000_PCI_CFG1_VIRT_BASE
| (bus_nr << 16)
| (PCI_SLOT(devfn) << 11)
| (PCI_FUNC(devfn) << 8) | where);
}
return paddress;
}
/*
* Mask table, bits to mask for quantity of size 1, 2 or 4 bytes.
* 0 and 3 are not valid indexes...
*/
static u32 bytemask[] = {
/*0*/ 0,
/*1*/ 0xff,
/*2*/ 0xffff,
/*3*/ 0,
/*4*/ 0xffffffff,
};
int ixp2000_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *value)
{
u32 n;
u32 *addr;
n = where % 4;
addr = ixp2000_pci_config_addr(bus->number, devfn, where);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
pci_master_aborts = 0;
*value = (*addr >> (8*n)) & bytemask[size];
if (pci_master_aborts) {
pci_master_aborts = 0;
*value = 0xffffffff;
return PCIBIOS_DEVICE_NOT_FOUND;
}
return PCIBIOS_SUCCESSFUL;
}
/*
* We don't do error checks by calling clear_master_aborts() b/c the
* assumption is that the caller did a read first to make sure a device
* exists.
*/
int ixp2000_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 value)
{
u32 mask;
u32 *addr;
u32 temp;
mask = ~(bytemask[size] << ((where % 0x4) * 8));
addr = ixp2000_pci_config_addr(bus->number, devfn, where);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
temp = (u32) (value) << ((where % 0x4) * 8);
*addr = (*addr & mask) | temp;
clear_master_aborts();
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops ixp2000_pci_ops = {
.read = ixp2000_pci_read_config,
.write = ixp2000_pci_write_config
};
struct pci_bus *ixp2000_pci_scan_bus(int nr, struct pci_sys_data *sysdata)
{
return pci_scan_bus(sysdata->busnr, &ixp2000_pci_ops, sysdata);
}
int ixp2000_pci_abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
volatile u32 temp;
unsigned long flags;
pci_master_aborts = 1;
local_irq_save(flags);
temp = *(IXP2000_PCI_CONTROL);
if (temp & ((1 << 8) | (1 << 5))) {
ixp2000_reg_wrb(IXP2000_PCI_CONTROL, temp);
}
temp = *(IXP2000_PCI_CMDSTAT);
if (temp & (1 << 29)) {
while (temp & (1 << 29)) {
ixp2000_reg_write(IXP2000_PCI_CMDSTAT, temp);
temp = *(IXP2000_PCI_CMDSTAT);
}
}
local_irq_restore(flags);
/*
* If it was an imprecise abort, then we need to correct the
* return address to be _after_ the instruction.
*/
if (fsr & (1 << 10))
regs->ARM_pc += 4;
return 0;
}
int
clear_master_aborts(void)
{
volatile u32 temp;
unsigned long flags;
local_irq_save(flags);
temp = *(IXP2000_PCI_CONTROL);
if (temp & ((1 << 8) | (1 << 5))) {
ixp2000_reg_wrb(IXP2000_PCI_CONTROL, temp);
}
temp = *(IXP2000_PCI_CMDSTAT);
if (temp & (1 << 29)) {
while (temp & (1 << 29)) {
ixp2000_reg_write(IXP2000_PCI_CMDSTAT, temp);
temp = *(IXP2000_PCI_CMDSTAT);
}
}
local_irq_restore(flags);
return 0;
}
void __init
ixp2000_pci_preinit(void)
{
#ifndef CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO
/*
* Configure the PCI unit to properly byteswap I/O transactions,
* and verify that it worked.
*/
ixp2000_reg_write(IXP2000_PCI_CONTROL,
(*IXP2000_PCI_CONTROL | PCI_CONTROL_IEE));
if ((*IXP2000_PCI_CONTROL & PCI_CONTROL_IEE) == 0)
panic("IXP2000: PCI I/O is broken on this ixp model, and "
"the needed workaround has not been configured in");
#endif
hook_fault_code(16+6, ixp2000_pci_abort_handler, SIGBUS,
"PCI config cycle to non-existent device");
}
/*
* IXP2000 systems often have large resource requirements, so we just
* use our own resource space.
*/
static struct resource ixp2000_pci_mem_space = {
.start = 0xe0000000,
.end = 0xffffffff,
.flags = IORESOURCE_MEM,
.name = "PCI Mem Space"
};
static struct resource ixp2000_pci_io_space = {
.start = 0x00010000,
.end = 0x0001ffff,
.flags = IORESOURCE_IO,
.name = "PCI I/O Space"
};
int ixp2000_pci_setup(int nr, struct pci_sys_data *sys)
{
if (nr >= 1)
return 0;
sys->resource[0] = &ixp2000_pci_io_space;
sys->resource[1] = &ixp2000_pci_mem_space;
sys->resource[2] = NULL;
return 1;
}