![Simon Arlott](/assets/img/avatar_default.png)
Spelling fixes in arch/arm/. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
248 lines
5.3 KiB
C
248 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/slab.h>
|
|
#include <linux/delay.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/system.h>
|
|
#include <asm/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;
|
|
}
|
|
|