xref: /kernel/linux/linux-5.10/arch/arm/mach-ixp4xx/gtwx5715-pci.c (revision 8c2ecf20)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * arch/arm/mach-ixp4xx/gtwx5715-pci.c
 *
 * Gemtek GTWX5715 (Linksys WRV54G) board setup
 *
 * Copyright (C) 2004 George T. Joseph
 * Derived from Coyote
 */

#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/mach/pci.h>

#include "irqs.h"

#define SLOT0_DEVID	0
#define SLOT1_DEVID	1
#define INTA		10 /* slot 1 has INTA and INTB crossed */
#define INTB		11

/*
 * Slot 0 isn't actually populated with a card connector but
 * we initialize it anyway in case a future version has the
 * slot populated or someone with good soldering skills has
 * some free time.
 */
void __init gtwx5715_pci_preinit(void)
{
	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
	irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
	ixp4xx_pci_preinit();
}


static int __init gtwx5715_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
	int rc = -1;

	if ((slot == SLOT0_DEVID && pin == 1) ||
	    (slot == SLOT1_DEVID && pin == 2))
		rc = IXP4XX_GPIO_IRQ(INTA);
	else if ((slot == SLOT0_DEVID && pin == 2) ||
		 (slot == SLOT1_DEVID && pin == 1))
		rc = IXP4XX_GPIO_IRQ(INTB);

	printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
	       __func__, slot, pin, rc);
	return rc;
}

struct hw_pci gtwx5715_pci __initdata = {
	.nr_controllers = 1,
	.ops		= &ixp4xx_ops,
	.preinit =        gtwx5715_pci_preinit,
	.setup =          ixp4xx_setup,
	.map_irq =        gtwx5715_map_irq,
};

int __init gtwx5715_pci_init(void)
{
	if (machine_is_gtwx5715())
		pci_common_init(&gtwx5715_pci);

	return 0;
}

subsys_initcall(gtwx5715_pci_init);