arch/mips/pci/fixup-emma2rh.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) NEC Electronics Corporation 2004-2006
 *
 *  This file is based on the arch/mips/ddb5xxx/ddb5477/pci.c
 *
 *	Copyright 2001 MontaVista Software Inc.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/pci.h>

#include <asm/bootinfo.h>

#include <asm/emma/emma2rh.h>

#define EMMA2RH_PCI_HOST_SLOT 0x09
#define EMMA2RH_USB_SLOT 0x03
#define PCI_DEVICE_ID_NEC_EMMA2RH      0x014b /* EMMA2RH PCI Host */

/*
 * we fix up irqs based on the slot number.
 * The first entry is at AD:11.
 * Fortunately this works because, although we have two pci buses,
 * they all have different slot numbers (except for rockhopper slot 20
 * which is handled below).
 *
 */

#define MAX_SLOT_NUM 10
static unsigned char irq_map[][5] = {
	[3] = {0, MARKEINS_PCI_IRQ_INTB, MARKEINS_PCI_IRQ_INTC,
	       MARKEINS_PCI_IRQ_INTD, 0,},
	[4] = {0, MARKEINS_PCI_IRQ_INTA, 0, 0, 0,},
	[5] = {0, 0, 0, 0, 0,},
	[6] = {0, MARKEINS_PCI_IRQ_INTC, MARKEINS_PCI_IRQ_INTD,
	       MARKEINS_PCI_IRQ_INTA, MARKEINS_PCI_IRQ_INTB,},
};

static void nec_usb_controller_fixup(struct pci_dev *dev)
{
	if (PCI_SLOT(dev->devfn) == EMMA2RH_USB_SLOT)
		/* on board USB controller configuration */
		pci_write_config_dword(dev, 0xe4, 1 << 5);
}

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
			nec_usb_controller_fixup);

/*
 * Prevent the PCI layer from seeing the resources allocated to this device
 * if it is the host bridge by marking it as such.  These resources are of
 * no consequence to the PCI layer (they are handled elsewhere).
 */
static void emma2rh_pci_host_fixup(struct pci_dev *dev)
{
	int i;

	if (PCI_SLOT(dev->devfn) == EMMA2RH_PCI_HOST_SLOT) {
		dev->class &= 0xff;
		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
			dev->resource[i].start = 0;
			dev->resource[i].end = 0;
			dev->resource[i].flags = 0;
		}
	}
}

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_EMMA2RH,
			 emma2rh_pci_host_fixup);

int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
	return irq_map[slot][pin];
}

/* Do platform specific device initialization at pci_enable_device() time */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
	return 0;
}