linux/arch/arm/mach-versatile/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

362 lines
8.7 KiB
C

/*
* linux/arch/arm/mach-versatile/pci.c
*
* (C) Copyright Koninklijke Philips Electronics NV 2004. All rights reserved.
* You can redistribute and/or modify this software under the terms of version 2
* of the GNU General Public License as published by the Free Software Foundation.
* THIS SOFTWARE IS PROVIDED "AS IS" 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.
* Koninklijke Philips Electronics nor its subsidiaries is obligated to provide any support for this software.
*
* ARM Versatile PCI driver.
*
* 14/04/2005 Initial version, colin.king@philips.com
*
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/mach/pci.h>
/*
* these spaces are mapped using the following base registers:
*
* Usage Local Bus Memory Base/Map registers used
*
* Mem 50000000 - 5FFFFFFF LB_BASE0/LB_MAP0, non prefetch
* Mem 60000000 - 6FFFFFFF LB_BASE1/LB_MAP1, prefetch
* IO 44000000 - 4FFFFFFF LB_BASE2/LB_MAP2, IO
* Cfg 42000000 - 42FFFFFF PCI config
*
*/
#define __IO_ADDRESS(n) ((void __iomem *)(unsigned long)IO_ADDRESS(n))
#define SYS_PCICTL __IO_ADDRESS(VERSATILE_SYS_PCICTL)
#define PCI_IMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x0)
#define PCI_IMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x4)
#define PCI_IMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x8)
#define PCI_SMAP0 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x10)
#define PCI_SMAP1 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x14)
#define PCI_SMAP2 __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0x18)
#define PCI_SELFID __IO_ADDRESS(VERSATILE_PCI_CORE_BASE+0xc)
#define DEVICE_ID_OFFSET 0x00
#define CSR_OFFSET 0x04
#define CLASS_ID_OFFSET 0x08
#define VP_PCI_DEVICE_ID 0x030010ee
#define VP_PCI_CLASS_ID 0x0b400000
static unsigned long pci_slot_ignore = 0;
static int __init versatile_pci_slot_ignore(char *str)
{
int retval;
int slot;
while ((retval = get_option(&str,&slot))) {
if ((slot < 0) || (slot > 31)) {
printk("Illegal slot value: %d\n",slot);
} else {
pci_slot_ignore |= (1 << slot);
}
}
return 1;
}
__setup("pci_slot_ignore=", versatile_pci_slot_ignore);
static void __iomem *__pci_addr(struct pci_bus *bus,
unsigned int devfn, int offset)
{
unsigned int busnr = bus->number;
/*
* Trap out illegal values
*/
if (offset > 255)
BUG();
if (busnr > 255)
BUG();
if (devfn > 255)
BUG();
return VERSATILE_PCI_CFG_VIRT_BASE + ((busnr << 16) |
(PCI_SLOT(devfn) << 11) | (PCI_FUNC(devfn) << 8) | offset);
}
static int versatile_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *val)
{
void __iomem *addr = __pci_addr(bus, devfn, where & ~3);
u32 v;
int slot = PCI_SLOT(devfn);
if (pci_slot_ignore & (1 << slot)) {
/* Ignore this slot */
switch (size) {
case 1:
v = 0xff;
break;
case 2:
v = 0xffff;
break;
default:
v = 0xffffffff;
}
} else {
switch (size) {
case 1:
v = __raw_readl(addr);
if (where & 2) v >>= 16;
if (where & 1) v >>= 8;
v &= 0xff;
break;
case 2:
v = __raw_readl(addr);
if (where & 2) v >>= 16;
v &= 0xffff;
break;
default:
v = __raw_readl(addr);
break;
}
}
*val = v;
return PCIBIOS_SUCCESSFUL;
}
static int versatile_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 val)
{
void __iomem *addr = __pci_addr(bus, devfn, where);
int slot = PCI_SLOT(devfn);
if (pci_slot_ignore & (1 << slot)) {
return PCIBIOS_SUCCESSFUL;
}
switch (size) {
case 1:
__raw_writeb((u8)val, addr);
break;
case 2:
__raw_writew((u16)val, addr);
break;
case 4:
__raw_writel(val, addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops pci_versatile_ops = {
.read = versatile_read_config,
.write = versatile_write_config,
};
static struct resource io_mem = {
.name = "PCI I/O space",
.start = VERSATILE_PCI_MEM_BASE0,
.end = VERSATILE_PCI_MEM_BASE0+VERSATILE_PCI_MEM_BASE0_SIZE-1,
.flags = IORESOURCE_IO,
};
static struct resource non_mem = {
.name = "PCI non-prefetchable",
.start = VERSATILE_PCI_MEM_BASE1,
.end = VERSATILE_PCI_MEM_BASE1+VERSATILE_PCI_MEM_BASE1_SIZE-1,
.flags = IORESOURCE_MEM,
};
static struct resource pre_mem = {
.name = "PCI prefetchable",
.start = VERSATILE_PCI_MEM_BASE2,
.end = VERSATILE_PCI_MEM_BASE2+VERSATILE_PCI_MEM_BASE2_SIZE-1,
.flags = IORESOURCE_MEM | IORESOURCE_PREFETCH,
};
static int __init pci_versatile_setup_resources(struct resource **resource)
{
int ret = 0;
ret = request_resource(&iomem_resource, &io_mem);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate I/O "
"memory region (%d)\n", ret);
goto out;
}
ret = request_resource(&iomem_resource, &non_mem);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate non-prefetchable "
"memory region (%d)\n", ret);
goto release_io_mem;
}
ret = request_resource(&iomem_resource, &pre_mem);
if (ret) {
printk(KERN_ERR "PCI: unable to allocate prefetchable "
"memory region (%d)\n", ret);
goto release_non_mem;
}
/*
* bus->resource[0] is the IO resource for this bus
* bus->resource[1] is the mem resource for this bus
* bus->resource[2] is the prefetch mem resource for this bus
*/
resource[0] = &io_mem;
resource[1] = &non_mem;
resource[2] = &pre_mem;
goto out;
release_non_mem:
release_resource(&non_mem);
release_io_mem:
release_resource(&io_mem);
out:
return ret;
}
int __init pci_versatile_setup(int nr, struct pci_sys_data *sys)
{
int ret = 0;
int i;
int myslot = -1;
unsigned long val;
void __iomem *local_pci_cfg_base;
val = __raw_readl(SYS_PCICTL);
if (!(val & 1)) {
printk("Not plugged into PCI backplane!\n");
ret = -EIO;
goto out;
}
if (nr == 0) {
sys->mem_offset = 0;
ret = pci_versatile_setup_resources(sys->resource);
if (ret < 0) {
printk("pci_versatile_setup: resources... oops?\n");
goto out;
}
} else {
printk("pci_versatile_setup: resources... nr == 0??\n");
goto out;
}
/*
* We need to discover the PCI core first to configure itself
* before the main PCI probing is performed
*/
for (i=0; i<32; i++)
if ((__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+DEVICE_ID_OFFSET) == VP_PCI_DEVICE_ID) &&
(__raw_readl(VERSATILE_PCI_VIRT_BASE+(i<<11)+CLASS_ID_OFFSET) == VP_PCI_CLASS_ID)) {
myslot = i;
break;
}
if (myslot == -1) {
printk("Cannot find PCI core!\n");
ret = -EIO;
goto out;
}
printk("PCI core found (slot %d)\n",myslot);
__raw_writel(myslot, PCI_SELFID);
local_pci_cfg_base = VERSATILE_PCI_CFG_VIRT_BASE + (myslot << 11);
val = __raw_readl(local_pci_cfg_base + CSR_OFFSET);
val |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE;
__raw_writel(val, local_pci_cfg_base + CSR_OFFSET);
/*
* Configure the PCI inbound memory windows to be 1:1 mapped to SDRAM
*/
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_0);
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_1);
__raw_writel(PHYS_OFFSET, local_pci_cfg_base + PCI_BASE_ADDRESS_2);
/*
* Do not to map Versatile FPGA PCI device into memory space
*/
pci_slot_ignore |= (1 << myslot);
ret = 1;
out:
return ret;
}
struct pci_bus *pci_versatile_scan_bus(int nr, struct pci_sys_data *sys)
{
return pci_scan_bus(sys->busnr, &pci_versatile_ops, sys);
}
void __init pci_versatile_preinit(void)
{
__raw_writel(VERSATILE_PCI_MEM_BASE0 >> 28, PCI_IMAP0);
__raw_writel(VERSATILE_PCI_MEM_BASE1 >> 28, PCI_IMAP1);
__raw_writel(VERSATILE_PCI_MEM_BASE2 >> 28, PCI_IMAP2);
__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP0);
__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP1);
__raw_writel(PHYS_OFFSET >> 28, PCI_SMAP2);
__raw_writel(1, SYS_PCICTL);
}
/*
* map the specified device/slot/pin to an IRQ. Different backplanes may need to modify this.
*/
static int __init versatile_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
int irq;
int devslot = PCI_SLOT(dev->devfn);
/* slot, pin, irq
* 24 1 27
* 25 1 28
* 26 1 29
* 27 1 30
*/
irq = 27 + ((slot + pin - 1) & 3);
printk("PCI map irq: slot %d, pin %d, devslot %d, irq: %d\n",slot,pin,devslot,irq);
return irq;
}
static struct hw_pci versatile_pci __initdata = {
.swizzle = NULL,
.map_irq = versatile_map_irq,
.nr_controllers = 1,
.setup = pci_versatile_setup,
.scan = pci_versatile_scan_bus,
.preinit = pci_versatile_preinit,
};
static int __init versatile_pci_init(void)
{
pci_common_init(&versatile_pci);
return 0;
}
subsys_initcall(versatile_pci_init);