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linux-next/arch/arm/plat-iop/pci.c
Linus Torvalds 0195c00244 Disintegrate and delete asm/system.h
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Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...
2012-03-28 15:58:21 -07:00

418 lines
9.8 KiB
C

/*
* arch/arm/plat-iop/pci.c
*
* PCI support for the Intel IOP32X and IOP33X processors
*
* Author: Rory Bolt <rorybolt@pacbell.net>
* Copyright (C) 2002 Rory Bolt
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/signal.h>
#include <mach/hardware.h>
#include <asm/mach/pci.h>
#include <asm/hardware/iop3xx.h>
// #define DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...) do { } while (0)
#endif
/*
* This routine builds either a type0 or type1 configuration command. If the
* bus is on the 803xx then a type0 made, else a type1 is created.
*/
static u32 iop3xx_cfg_address(struct pci_bus *bus, int devfn, int where)
{
struct pci_sys_data *sys = bus->sysdata;
u32 addr;
if (sys->busnr == bus->number)
addr = 1 << (PCI_SLOT(devfn) + 16) | (PCI_SLOT(devfn) << 11);
else
addr = bus->number << 16 | PCI_SLOT(devfn) << 11 | 1;
addr |= PCI_FUNC(devfn) << 8 | (where & ~3);
return addr;
}
/*
* This routine checks the status of the last configuration cycle. If an error
* was detected it returns a 1, else it returns a 0. The errors being checked
* are parity, master abort, target abort (master and target). These types of
* errors occur during a config cycle where there is no device, like during
* the discovery stage.
*/
static int iop3xx_pci_status(void)
{
unsigned int status;
int ret = 0;
/*
* Check the status registers.
*/
status = *IOP3XX_ATUSR;
if (status & 0xf900) {
DBG("\t\t\tPCI: P0 - status = 0x%08x\n", status);
*IOP3XX_ATUSR = status & 0xf900;
ret = 1;
}
status = *IOP3XX_ATUISR;
if (status & 0x679f) {
DBG("\t\t\tPCI: P1 - status = 0x%08x\n", status);
*IOP3XX_ATUISR = status & 0x679f;
ret = 1;
}
return ret;
}
/*
* Simply write the address register and read the configuration
* data. Note that the 4 nops ensure that we are able to handle
* a delayed abort (in theory.)
*/
static u32 iop3xx_read(unsigned long addr)
{
u32 val;
__asm__ __volatile__(
"str %1, [%2]\n\t"
"ldr %0, [%3]\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
: "=r" (val)
: "r" (addr), "r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
return val;
}
/*
* The read routines must check the error status of the last configuration
* cycle. If there was an error, the routine returns all hex f's.
*/
static int
iop3xx_read_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 *value)
{
unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
u32 val = iop3xx_read(addr) >> ((where & 3) * 8);
if (iop3xx_pci_status())
val = 0xffffffff;
*value = val;
return PCIBIOS_SUCCESSFUL;
}
static int
iop3xx_write_config(struct pci_bus *bus, unsigned int devfn, int where,
int size, u32 value)
{
unsigned long addr = iop3xx_cfg_address(bus, devfn, where);
u32 val;
if (size != 4) {
val = iop3xx_read(addr);
if (iop3xx_pci_status())
return PCIBIOS_SUCCESSFUL;
where = (where & 3) * 8;
if (size == 1)
val &= ~(0xff << where);
else
val &= ~(0xffff << where);
*IOP3XX_OCCDR = val | value << where;
} else {
asm volatile(
"str %1, [%2]\n\t"
"str %0, [%3]\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
:
: "r" (value), "r" (addr),
"r" (IOP3XX_OCCAR), "r" (IOP3XX_OCCDR));
}
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops iop3xx_ops = {
.read = iop3xx_read_config,
.write = iop3xx_write_config,
};
/*
* When a PCI device does not exist during config cycles, the 80200 gets a
* bus error instead of returning 0xffffffff. This handler simply returns.
*/
static int
iop3xx_pci_abort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
{
DBG("PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx\n",
addr, fsr, regs->ARM_pc, regs->ARM_lr);
/*
* 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 iop3xx_pci_setup(int nr, struct pci_sys_data *sys)
{
struct resource *res;
if (nr != 0)
return 0;
res = kzalloc(2 * sizeof(struct resource), GFP_KERNEL);
if (!res)
panic("PCI: unable to alloc resources");
res[0].start = IOP3XX_PCI_LOWER_IO_PA;
res[0].end = IOP3XX_PCI_LOWER_IO_PA + IOP3XX_PCI_IO_WINDOW_SIZE - 1;
res[0].name = "IOP3XX PCI I/O Space";
res[0].flags = IORESOURCE_IO;
request_resource(&ioport_resource, &res[0]);
res[1].start = IOP3XX_PCI_LOWER_MEM_PA;
res[1].end = IOP3XX_PCI_LOWER_MEM_PA + IOP3XX_PCI_MEM_WINDOW_SIZE - 1;
res[1].name = "IOP3XX PCI Memory Space";
res[1].flags = IORESOURCE_MEM;
request_resource(&iomem_resource, &res[1]);
/*
* Use whatever translation is already setup.
*/
sys->mem_offset = IOP3XX_PCI_LOWER_MEM_PA - *IOP3XX_OMWTVR0;
sys->io_offset = IOP3XX_PCI_LOWER_IO_PA - *IOP3XX_OIOWTVR;
pci_add_resource_offset(&sys->resources, &res[0], sys->io_offset);
pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
return 1;
}
struct pci_bus *iop3xx_pci_scan_bus(int nr, struct pci_sys_data *sys)
{
return pci_scan_root_bus(NULL, sys->busnr, &iop3xx_ops, sys,
&sys->resources);
}
void __init iop3xx_atu_setup(void)
{
/* BAR 0 ( Disabled ) */
*IOP3XX_IAUBAR0 = 0x0;
*IOP3XX_IABAR0 = 0x0;
*IOP3XX_IATVR0 = 0x0;
*IOP3XX_IALR0 = 0x0;
/* BAR 1 ( Disabled ) */
*IOP3XX_IAUBAR1 = 0x0;
*IOP3XX_IABAR1 = 0x0;
*IOP3XX_IALR1 = 0x0;
/* BAR 2 (1:1 mapping with Physical RAM) */
/* Set limit and enable */
*IOP3XX_IALR2 = ~((u32)IOP3XX_MAX_RAM_SIZE - 1) & ~0x1;
*IOP3XX_IAUBAR2 = 0x0;
/* Align the inbound bar with the base of memory */
*IOP3XX_IABAR2 = PHYS_OFFSET |
PCI_BASE_ADDRESS_MEM_TYPE_64 |
PCI_BASE_ADDRESS_MEM_PREFETCH;
*IOP3XX_IATVR2 = PHYS_OFFSET;
/* Outbound window 0 */
*IOP3XX_OMWTVR0 = IOP3XX_PCI_LOWER_MEM_BA;
*IOP3XX_OUMWTVR0 = 0;
/* Outbound window 1 */
*IOP3XX_OMWTVR1 = IOP3XX_PCI_LOWER_MEM_BA +
IOP3XX_PCI_MEM_WINDOW_SIZE / 2;
*IOP3XX_OUMWTVR1 = 0;
/* BAR 3 ( Disabled ) */
*IOP3XX_IAUBAR3 = 0x0;
*IOP3XX_IABAR3 = 0x0;
*IOP3XX_IATVR3 = 0x0;
*IOP3XX_IALR3 = 0x0;
/* Setup the I/O Bar
*/
*IOP3XX_OIOWTVR = IOP3XX_PCI_LOWER_IO_BA;
/* Enable inbound and outbound cycles
*/
*IOP3XX_ATUCMD |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
*IOP3XX_ATUCR |= IOP3XX_ATUCR_OUT_EN;
}
void __init iop3xx_atu_disable(void)
{
*IOP3XX_ATUCMD = 0;
*IOP3XX_ATUCR = 0;
/* wait for cycles to quiesce */
while (*IOP3XX_PCSR & (IOP3XX_PCSR_OUT_Q_BUSY |
IOP3XX_PCSR_IN_Q_BUSY))
cpu_relax();
/* BAR 0 ( Disabled ) */
*IOP3XX_IAUBAR0 = 0x0;
*IOP3XX_IABAR0 = 0x0;
*IOP3XX_IATVR0 = 0x0;
*IOP3XX_IALR0 = 0x0;
/* BAR 1 ( Disabled ) */
*IOP3XX_IAUBAR1 = 0x0;
*IOP3XX_IABAR1 = 0x0;
*IOP3XX_IALR1 = 0x0;
/* BAR 2 ( Disabled ) */
*IOP3XX_IAUBAR2 = 0x0;
*IOP3XX_IABAR2 = 0x0;
*IOP3XX_IATVR2 = 0x0;
*IOP3XX_IALR2 = 0x0;
/* BAR 3 ( Disabled ) */
*IOP3XX_IAUBAR3 = 0x0;
*IOP3XX_IABAR3 = 0x0;
*IOP3XX_IATVR3 = 0x0;
*IOP3XX_IALR3 = 0x0;
/* Clear the outbound windows */
*IOP3XX_OIOWTVR = 0;
/* Outbound window 0 */
*IOP3XX_OMWTVR0 = 0;
*IOP3XX_OUMWTVR0 = 0;
/* Outbound window 1 */
*IOP3XX_OMWTVR1 = 0;
*IOP3XX_OUMWTVR1 = 0;
}
/* Flag to determine whether the ATU is initialized and the PCI bus scanned */
int init_atu;
int iop3xx_get_init_atu(void) {
/* check if default has been overridden */
if (init_atu != IOP3XX_INIT_ATU_DEFAULT)
return init_atu;
else
return IOP3XX_INIT_ATU_DISABLE;
}
static void __init iop3xx_atu_debug(void)
{
DBG("PCI: Intel IOP3xx PCI init.\n");
DBG("PCI: Outbound memory window 0: PCI 0x%08x%08x\n",
*IOP3XX_OUMWTVR0, *IOP3XX_OMWTVR0);
DBG("PCI: Outbound memory window 1: PCI 0x%08x%08x\n",
*IOP3XX_OUMWTVR1, *IOP3XX_OMWTVR1);
DBG("PCI: Outbound IO window: PCI 0x%08x\n",
*IOP3XX_OIOWTVR);
DBG("PCI: Inbound memory window 0: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
*IOP3XX_IAUBAR0, *IOP3XX_IABAR0, *IOP3XX_IALR0, *IOP3XX_IATVR0);
DBG("PCI: Inbound memory window 1: PCI 0x%08x%08x 0x%08x\n",
*IOP3XX_IAUBAR1, *IOP3XX_IABAR1, *IOP3XX_IALR1);
DBG("PCI: Inbound memory window 2: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
*IOP3XX_IAUBAR2, *IOP3XX_IABAR2, *IOP3XX_IALR2, *IOP3XX_IATVR2);
DBG("PCI: Inbound memory window 3: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
*IOP3XX_IAUBAR3, *IOP3XX_IABAR3, *IOP3XX_IALR3, *IOP3XX_IATVR3);
DBG("PCI: Expansion ROM window: PCI 0x%08x%08x 0x%08x -> 0x%08x\n",
0, *IOP3XX_ERBAR, *IOP3XX_ERLR, *IOP3XX_ERTVR);
DBG("ATU: IOP3XX_ATUCMD=0x%04x\n", *IOP3XX_ATUCMD);
DBG("ATU: IOP3XX_ATUCR=0x%08x\n", *IOP3XX_ATUCR);
hook_fault_code(16+6, iop3xx_pci_abort, SIGBUS, 0, "imprecise external abort");
}
/* for platforms that might be host-bus-adapters */
void __init iop3xx_pci_preinit_cond(void)
{
if (iop3xx_get_init_atu() == IOP3XX_INIT_ATU_ENABLE) {
iop3xx_atu_disable();
iop3xx_atu_setup();
iop3xx_atu_debug();
}
}
void __init iop3xx_pci_preinit(void)
{
pcibios_min_io = 0;
pcibios_min_mem = 0;
iop3xx_atu_disable();
iop3xx_atu_setup();
iop3xx_atu_debug();
}
/* allow init_atu to be user overridden */
static int __init iop3xx_init_atu_setup(char *str)
{
init_atu = IOP3XX_INIT_ATU_DEFAULT;
if (str) {
while (*str != '\0') {
switch (*str) {
case 'y':
case 'Y':
init_atu = IOP3XX_INIT_ATU_ENABLE;
break;
case 'n':
case 'N':
init_atu = IOP3XX_INIT_ATU_DISABLE;
break;
case ',':
case '=':
break;
default:
printk(KERN_DEBUG "\"%s\" malformed at "
"character: \'%c\'",
__func__,
*str);
*(str + 1) = '\0';
}
str++;
}
}
return 1;
}
__setup("iop3xx_init_atu", iop3xx_init_atu_setup);