/*
 *  $Id$
 *
 *  ADM5120 specific PCI fixups
 *
 *  Copyright (C) ADMtek Incorporated.
 *  Copyright (C) 2005 Jeroen Vreeken (pe1rxq@amsat.org)
 *  Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
 *  Copyright (C) 2007 OpenWrt.org
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the
 *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA  02110-1301, USA.
 *
 */

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

#include <asm/delay.h>
#include <asm/bootinfo.h>

#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_irq.h>

struct adm5120_pci_irq {
	u8	slot;
	u8	func;
	u8	pin;
	unsigned irq;
};

#define PCIIRQ(s,f,p,i) { 	\
	.slot = (s),		\
	.func = (f),		\
	.pin  = (p),		\
	.irq  = (i)		\
	}

static struct adm5120_pci_irq default_pci_irqs[] __initdata = {
	PCIIRQ(2, 0, 1, ADM5120_IRQ_PCI0),
};

static struct adm5120_pci_irq rb1xx_pci_irqs[] __initdata = {
	PCIIRQ(1, 0, 1, ADM5120_IRQ_PCI0),
	PCIIRQ(2, 0, 1, ADM5120_IRQ_PCI1),
	PCIIRQ(3, 0, 1, ADM5120_IRQ_PCI2)
};

static struct adm5120_pci_irq cas771_pci_irqs[] __initdata = {
	PCIIRQ(2, 0, 1, ADM5120_IRQ_PCI0),
	PCIIRQ(3, 0, 1, ADM5120_IRQ_PCI1),
	PCIIRQ(3, 2, 3, ADM5120_IRQ_PCI2)
};

static struct adm5120_pci_irq np28g_pci_irqs[] __initdata = {
	PCIIRQ(2, 0, 1, ADM5120_IRQ_PCI0),
	PCIIRQ(3, 0, 1, ADM5120_IRQ_PCI0),
	PCIIRQ(3, 1, 2, ADM5120_IRQ_PCI1),
	PCIIRQ(3, 2, 3, ADM5120_IRQ_PCI2)
};

#define GETMAP(n) do { 				\
		nr_irqs = ARRAY_SIZE(n ## _pci_irqs); 	\
		p = n ## _pci_irqs;			\
	} while (0)

int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
	struct adm5120_pci_irq	*p;
	int nr_irqs;
	int i;
	int irq;
	
	irq = -1;
	if (slot < 1 || slot > 3) {
		printk("PCI: slot number %u is not supported\n", slot);
		goto out;
	}
	
	GETMAP(default);

	switch (mips_machtype) {
	case MACH_ADM5120_RB_111:
	case MACH_ADM5120_RB_112:
	case MACH_ADM5120_RB_133:
	case MACH_ADM5120_RB_133C:
	case MACH_ADM5120_RB_153:
		GETMAP(rb1xx);
		break;
	case MACH_ADM5120_NP28G:
		GETMAP(np28g);
		break;
	case MACH_ADM5120_P335:
	case MACH_ADM5120_P334WT:
		/* using default mapping */
		break;
#if 0
	case MACH_ADM5120_CAS771:
		GETMAP(cas771)
		break;
	case MACH_ADM5120_CAS630:
	case MACH_ADM5120_CAS670:
	case MACH_ADM5120_CAS700:
	case MACH_ADM5120_CAS790:
	case MACH_ADM5120_CAS861:
#endif
	case MACH_ADM5120_NP27G:
	case MACH_ADM5120_NP28GHS:
	case MACH_ADM5120_WP54AG:
	case MACH_ADM5120_WP54G:
	case MACH_ADM5120_WP54G_WRT:
	case MACH_ADM5120_WPP54AG:
	case MACH_ADM5120_WPP54G:
	default:
		printk("PCI: irq map is unknown for %s, using defaults.\n",
			adm5120_board_name());
		break;
	}
	
	for (i=0; i<nr_irqs; i++, p++) {
		if ((p->slot == slot) && (PCI_FUNC(dev->devfn) == p->func) && 
		    (p->pin == pin)) {
			irq = p->irq;
			break;
		}
	}
	
	if (irq < 0) {
		printk(KERN_INFO "PCI: no irq found for %s pin:%u\n",
			pci_name(dev), pin);
	} else {
		printk(KERN_INFO "PCI: mapping irq for %s pin:%u, irq:%d\n",
			pci_name(dev), pin, irq);		
	}

out:
	return irq;
}

static void adm5120_pci_fixup(struct pci_dev *dev)
{
	if (dev->devfn != 0)
		return;

	/* setup COMMAND register */
	pci_write_config_word(dev, PCI_COMMAND, 
		(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER));

	/* setup CACHE_LINE_SIZE register */
	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 4);

	/* setting up BARS */
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0, 0);
	pci_write_config_dword(dev, PCI_BASE_ADDRESS_1, 0);
}

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ADMTEK, PCI_DEVICE_ID_ADMTEK_ADM5120, 
	adm5120_pci_fixup);

int pcibios_plat_dev_init(struct pci_dev *dev)
{
	return 0;
}