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/*
* arch/arm/mach-ixp4xx/nslu2-pci.c
*
* NSLU2 board-level PCI initialization
*
* based on ixdp425-pci.c:
* Copyright (C) 2002 Intel Corporation.
* Copyright (C) 2003-2004 MontaVista Software, Inc.
*
* Maintainer: http://www.nslu2-linux.org/
*
* 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.
*
*/
// GPIO 8 is used as the power input so is not free for use as a PCI IRQ
// However, all the common PCI setup code presumes the standard 4 PCI
// interrupts are available. So we compromise...we don't enable the
// IRQ on Pin 8 but we let
#include <linux/config.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/mach/pci.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/mach-types.h>
void __init nslu2_pci_preinit(void)
{
gpio_line_config(NSLU2_PCI_INTA_PIN,
IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
gpio_line_config(NSLU2_PCI_INTB_PIN,
IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
gpio_line_config(NSLU2_PCI_INTC_PIN,
IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
// gpio_line_config(NSLU2_PCI_INTD_PIN,
// IXP4XX_GPIO_IN | IXP4XX_GPIO_ACTIVE_LOW);
gpio_line_isr_clear(NSLU2_PCI_INTA_PIN);
gpio_line_isr_clear(NSLU2_PCI_INTB_PIN);
gpio_line_isr_clear(NSLU2_PCI_INTC_PIN);
// gpio_line_isr_clear(NSLU2_PCI_INTD_PIN);
ixp4xx_pci_preinit();
}
static int __init nslu2_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
static int pci_irq_table[NSLU2_PCI_IRQ_LINES] = {
IRQ_NSLU2_PCI_INTA,
IRQ_NSLU2_PCI_INTB,
IRQ_NSLU2_PCI_INTC,
// IRQ_NSLU2_PCI_INTD
};
int irq = -1;
if (slot >= 1 && slot <= NSLU2_PCI_MAX_DEV &&
pin >= 1 && pin <= NSLU2_PCI_IRQ_LINES) {
irq = pci_irq_table[(slot + pin - 2) % 3]; // ! % 4 kas11
}
return irq;
}
struct hw_pci __initdata nslu2_pci = {
.nr_controllers = 1,
.preinit = nslu2_pci_preinit,
.swizzle = pci_std_swizzle,
.setup = ixp4xx_setup,
.scan = ixp4xx_scan_bus,
.map_irq = nslu2_map_irq,
};
int __init nslu2_pci_init(void) //monkey see, monkey do
{
if (machine_is_nslu2())
pci_common_init(&nslu2_pci);
return 0;
}
subsys_initcall(nslu2_pci_init);
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