[deliverable/linux.git] / arch / arm / mach-integrator / pci.c

/*
 *  linux/arch/arm/mach-integrator/pci-integrator.c
 *
 *  Copyright (C) 1999 ARM Limited
 *  Copyright (C) 2000 Deep Blue Solutions Ltd
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *
 *  PCI functions for Integrator
 */
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/init.h>

#include <asm/irq.h>
#include <asm/system.h>
#include <asm/mach/pci.h>
#include <asm/mach-types.h>

/* 
 * A small note about bridges and interrupts.  The DECchip 21050 (and
 * later) adheres to the PCI-PCI bridge specification.  This says that
 * the interrupts on the other side of a bridge are swizzled in the
 * following manner:
 *
 * Dev    Interrupt   Interrupt 
 *        Pin on      Pin on 
 *        Device      Connector
 *
 *   4    A           A
 *        B           B
 *        C           C
 *        D           D
 * 
 *   5    A           B
 *        B           C
 *        C           D
 *        D           A
 *
 *   6    A           C
 *        B           D
 *        C           A
 *        D           B
 *
 *   7    A           D
 *        B           A
 *        C           B
 *        D           C
 *
 * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
 * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
 */

/*
 * This routine handles multiple bridges.
 */
static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
{
	int pin = *pinp;

	if (pin == 0)
		pin = 1;

	while (dev->bus->self) {
		pin = pci_swizzle_interrupt_pin(dev, pin);
		/*
		 * move up the chain of bridges, swizzling as we go.
		 */
		dev = dev->bus->self;
	}
	*pinp = pin;

	return PCI_SLOT(dev->devfn);
}

static int irq_tab[4] __initdata = {
	IRQ_AP_PCIINT0,	IRQ_AP_PCIINT1,	IRQ_AP_PCIINT2,	IRQ_AP_PCIINT3
};

/*
 * map the specified device/slot/pin to an IRQ.  This works out such
 * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
 */
static int __init integrator_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
	int intnr = ((slot - 9) + (pin - 1)) & 3;

	return irq_tab[intnr];
}

extern void pci_v3_init(void *);

static struct hw_pci integrator_pci __initdata = {
	.swizzle		= integrator_swizzle,
	.map_irq		= integrator_map_irq,
	.setup			= pci_v3_setup,
	.nr_controllers		= 1,
	.scan			= pci_v3_scan_bus,
	.preinit		= pci_v3_preinit,
	.postinit		= pci_v3_postinit,
};

static int __init integrator_pci_init(void)
{
	if (machine_is_integrator())
		pci_common_init(&integrator_pci);
	return 0;
}

subsys_initcall(integrator_pci_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/mach-integrator/pci-integrator.c
	3	*
	4	* Copyright (C) 1999 ARM Limited
	5	* Copyright (C) 2000 Deep Blue Solutions Ltd
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*
	22	* PCI functions for Integrator
	23	*/
	24	#include <linux/kernel.h>
	25	#include <linux/pci.h>
1da177e4 LT	26	#include <linux/interrupt.h>
	27	#include <linux/init.h>
	28
	29	#include <asm/irq.h>
	30	#include <asm/system.h>
	31	#include <asm/mach/pci.h>
	32	#include <asm/mach-types.h>
	33
	34	/*
	35	* A small note about bridges and interrupts. The DECchip 21050 (and
	36	* later) adheres to the PCI-PCI bridge specification. This says that
	37	* the interrupts on the other side of a bridge are swizzled in the
	38	* following manner:
	39	*
	40	* Dev Interrupt Interrupt
	41	* Pin on Pin on
	42	* Device Connector
	43	*
	44	* 4 A A
	45	* B B
	46	* C C
	47	* D D
	48	*
	49	* 5 A B
	50	* B C
	51	* C D
	52	* D A
	53	*
	54	* 6 A C
	55	* B D
	56	* C A
	57	* D B
	58	*
	59	* 7 A D
	60	* B A
	61	* C B
	62	* D C
	63	*
	64	* Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
	65	* Thus, each swizzle is ((pin-1) + (device#-4)) % 4
1da177e4	66	*/
1da177e4 LT	67
	68	/*
	69	* This routine handles multiple bridges.
	70	*/
	71	static u8 __init integrator_swizzle(struct pci_dev dev, u8 pinp)
	72	{
	73	int pin = *pinp;
	74
	75	if (pin == 0)
	76	pin = 1;
	77
1da177e4	78	while (dev->bus->self) {
f14d766a	79	pin = pci_swizzle_interrupt_pin(dev, pin);
1da177e4 LT	80	/*
	81	* move up the chain of bridges, swizzling as we go.
	82	*/
	83	dev = dev->bus->self;
	84	}
f14d766a	85	*pinp = pin;
1da177e4 LT	86
	87	return PCI_SLOT(dev->devfn);
	88	}
	89
	90	static int irq_tab[4] __initdata = {
	91	IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3
	92	};
	93
	94	/*
	95	* map the specified device/slot/pin to an IRQ. This works out such
	96	* that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
	97	*/
	98	static int __init integrator_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
	99	{
	100	int intnr = ((slot - 9) + (pin - 1)) & 3;
	101
	102	return irq_tab[intnr];
	103	}
	104
	105	extern void pci_v3_init(void *);
	106
	107	static struct hw_pci integrator_pci __initdata = {
	108	.swizzle = integrator_swizzle,
	109	.map_irq = integrator_map_irq,
	110	.setup = pci_v3_setup,
	111	.nr_controllers = 1,
	112	.scan = pci_v3_scan_bus,
	113	.preinit = pci_v3_preinit,
	114	.postinit = pci_v3_postinit,
	115	};
	116
	117	static int __init integrator_pci_init(void)
	118	{
	119	if (machine_is_integrator())
	120	pci_common_init(&integrator_pci);
	121	return 0;
	122	}
	123
	124	subsys_initcall(integrator_pci_init);