[linux.git] / drivers / parisc / gsc.c

/*
 * Interrupt management for most GSC and related devices.
 *
 * (c) Copyright 1999 Alex deVries for The Puffin Group
 * (c) Copyright 1999 Grant Grundler for Hewlett-Packard
 * (c) Copyright 1999 Matthew Wilcox
 * (c) Copyright 2000 Helge Deller
 * (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
 *
 *	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.
 */

#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <asm/hardware.h>
#include <asm/io.h>

#include "gsc.h"

#undef DEBUG

#ifdef DEBUG
#define DEBPRINTK printk
#else
#define DEBPRINTK(x,...)
#endif

int gsc_alloc_irq(struct gsc_irq *i)
{
	int irq = txn_alloc_irq(GSC_EIM_WIDTH);
	if (irq < 0) {
		printk("cannot get irq\n");
		return irq;
	}

	i->txn_addr = txn_alloc_addr(irq);
	i->txn_data = txn_alloc_data(irq);
	i->irq = irq;

	return irq;
}

int gsc_claim_irq(struct gsc_irq *i, int irq)
{
	int c = irq;

	irq += CPU_IRQ_BASE; /* virtualize the IRQ first */

	irq = txn_claim_irq(irq);
	if (irq < 0) {
		printk("cannot claim irq %d\n", c);
		return irq;
	}

	i->txn_addr = txn_alloc_addr(irq);
	i->txn_data = txn_alloc_data(irq);
	i->irq = irq;

	return irq;
}

EXPORT_SYMBOL(gsc_alloc_irq);
EXPORT_SYMBOL(gsc_claim_irq);

/* Common interrupt demultiplexer used by Asp, Lasi & Wax.  */
irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
{
	unsigned long irr;
	struct gsc_asic *gsc_asic = dev;

	irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
	if (irr == 0)
		return IRQ_NONE;

	DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);

	do {
		int local_irq = __ffs(irr);
		unsigned int irq = gsc_asic->global_irq[local_irq];
		__do_IRQ(irq);
		irr &= ~(1 << local_irq);
	} while (irr);

	return IRQ_HANDLED;
}

int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
{
	int local_irq;

	for (local_irq = 0; local_irq < limit; local_irq++) {
		if (global_irqs[local_irq] == irq)
			return local_irq;
	}

	return NO_IRQ;
}

static void gsc_asic_disable_irq(unsigned int irq)
{
	struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
	int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
	u32 imr;

	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq,
			irq_dev->name, imr);

	/* Disable the IRQ line by clearing the bit in the IMR */
	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	imr &= ~(1 << local_irq);
	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
}

static void gsc_asic_enable_irq(unsigned int irq)
{
	struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
	int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
	u32 imr;

	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq,
			irq_dev->name, imr);

	/* Enable the IRQ line by setting the bit in the IMR */
	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	imr |= 1 << local_irq;
	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	/*
	 * FIXME: read IPR to make sure the IRQ isn't already pending.
	 *   If so, we need to read IRR and manually call do_irq().
	 */
}

static unsigned int gsc_asic_startup_irq(unsigned int irq)
{
	gsc_asic_enable_irq(irq);
	return 0;
}

static struct hw_interrupt_type gsc_asic_interrupt_type = {
	.typename =	"GSC-ASIC",
	.startup =	gsc_asic_startup_irq,
	.shutdown =	gsc_asic_disable_irq,
	.enable =	gsc_asic_enable_irq,
	.disable =	gsc_asic_disable_irq,
	.ack =		no_ack_irq,
	.end =		no_end_irq,
};

int gsc_assign_irq(struct hw_interrupt_type *type, void *data)
{
	static int irq = GSC_IRQ_BASE;

	if (irq > GSC_IRQ_MAX)
		return NO_IRQ;

	irq_desc[irq].chip = type;
	irq_desc[irq].chip_data = data;
	return irq++;
}

void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
{
	int irq = asic->global_irq[local_irq];
	
	if (irq <= 0) {
		irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
		if (irq == NO_IRQ)
			return;

		asic->global_irq[local_irq] = irq;
	}
	*irqp = irq;
}

static struct device *next_device(struct klist_iter *i)
{
	struct klist_node * n = klist_next(i);
	return n ? container_of(n, struct device, knode_parent) : NULL;
}

void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
			void (*choose_irq)(struct parisc_device *, void *))
{
	struct device *dev;
	struct klist_iter i;

	klist_iter_init(&parent->dev.klist_children, &i);
	while ((dev = next_device(&i))) {
		struct parisc_device *padev = to_parisc_device(dev);

		/* work-around for 715/64 and others which have parent 
		   at path [5] and children at path [5/0/x] */
		if (padev->id.hw_type == HPHW_FAULTY)
			return gsc_fixup_irqs(padev, ctrl, choose_irq);
		choose_irq(padev, ctrl);
	}
	klist_iter_exit(&i);
}

int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
{
	struct resource *res;
	int i;

	gsc_asic->gsc = parent;

	/* Initialise local irq -> global irq mapping */
	for (i = 0; i < 32; i++) {
		gsc_asic->global_irq[i] = NO_IRQ;
	}

	/* allocate resource region */
	res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
	if (res) {
		res->flags = IORESOURCE_MEM; 	/* do not mark it busy ! */
	}

#if 0
	printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
			parent->irq, gsc_asic->eim);
	if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
		printk("  IMR is non-zero! (0x%x)",
				gsc_readl(gsc_asic->hpa + OFFSET_IMR));
	printk("\n");
#endif

	return 0;
}

extern struct parisc_driver lasi_driver;
extern struct parisc_driver asp_driver;
extern struct parisc_driver wax_driver;

void __init gsc_init(void)
{
#ifdef CONFIG_GSC_LASI
	register_parisc_driver(&lasi_driver);
	register_parisc_driver(&asp_driver);
#endif
#ifdef CONFIG_GSC_WAX
	register_parisc_driver(&wax_driver);
#endif
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Interrupt management for most GSC and related devices.
	3	*
	4	* (c) Copyright 1999 Alex deVries for The Puffin Group
	5	* (c) Copyright 1999 Grant Grundler for Hewlett-Packard
	6	* (c) Copyright 1999 Matthew Wilcox
	7	* (c) Copyright 2000 Helge Deller
	8	* (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*/
	15
	16	#include <linux/bitops.h>
1da177e4 LT	17	#include <linux/errno.h>
	18	#include <linux/init.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/ioport.h>
	21	#include <linux/module.h>
	22	#include <linux/slab.h>
	23	#include <linux/types.h>
	24
	25	#include <asm/hardware.h>
	26	#include <asm/io.h>
	27
	28	#include "gsc.h"
	29
	30	#undef DEBUG
	31
	32	#ifdef DEBUG
	33	#define DEBPRINTK printk
	34	#else
	35	#define DEBPRINTK(x,...)
	36	#endif
	37
	38	int gsc_alloc_irq(struct gsc_irq *i)
	39	{
	40	int irq = txn_alloc_irq(GSC_EIM_WIDTH);
	41	if (irq < 0) {
	42	printk("cannot get irq\n");
	43	return irq;
	44	}
	45
	46	i->txn_addr = txn_alloc_addr(irq);
	47	i->txn_data = txn_alloc_data(irq);
	48	i->irq = irq;
	49
	50	return irq;
	51	}
	52
	53	int gsc_claim_irq(struct gsc_irq *i, int irq)
	54	{
	55	int c = irq;
	56
	57	irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
	58
	59	irq = txn_claim_irq(irq);
	60	if (irq < 0) {
	61	printk("cannot claim irq %d\n", c);
	62	return irq;
	63	}
	64
	65	i->txn_addr = txn_alloc_addr(irq);
	66	i->txn_data = txn_alloc_data(irq);
	67	i->irq = irq;
	68
	69	return irq;
	70	}
	71
	72	EXPORT_SYMBOL(gsc_alloc_irq);
	73	EXPORT_SYMBOL(gsc_claim_irq);
	74
	75	/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
7d12e780	76	irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
1da177e4 LT	77	{
	78	unsigned long irr;
	79	struct gsc_asic *gsc_asic = dev;
	80
	81	irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
	82	if (irr == 0)
	83	return IRQ_NONE;
	84
	85	DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
	86
	87	do {
	88	int local_irq = __ffs(irr);
	89	unsigned int irq = gsc_asic->global_irq[local_irq];
7d12e780	90	__do_IRQ(irq);
1da177e4 LT	91	irr &= ~(1 << local_irq);
	92	} while (irr);
	93
	94	return IRQ_HANDLED;
	95	}
	96
	97	int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
	98	{
	99	int local_irq;
	100
	101	for (local_irq = 0; local_irq < limit; local_irq++) {
	102	if (global_irqs[local_irq] == irq)
	103	return local_irq;
	104	}
	105
	106	return NO_IRQ;
	107	}
	108
	109	static void gsc_asic_disable_irq(unsigned int irq)
	110	{
d1bef4ed	111	struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
1da177e4 LT	112	int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
	113	u32 imr;
	114
	115	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq,
	116	irq_dev->name, imr);
	117
	118	/* Disable the IRQ line by clearing the bit in the IMR */
	119	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	120	imr &= ~(1 << local_irq);
	121	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	122	}
	123
	124	static void gsc_asic_enable_irq(unsigned int irq)
	125	{
d1bef4ed	126	struct gsc_asic *irq_dev = irq_desc[irq].chip_data;
1da177e4 LT	127	int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
	128	u32 imr;
	129
	130	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq,
	131	irq_dev->name, imr);
	132
	133	/* Enable the IRQ line by setting the bit in the IMR */
	134	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	135	imr \|= 1 << local_irq;
	136	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	137	/*
	138	* FIXME: read IPR to make sure the IRQ isn't already pending.
	139	* If so, we need to read IRR and manually call do_irq().
	140	*/
	141	}
	142
	143	static unsigned int gsc_asic_startup_irq(unsigned int irq)
	144	{
	145	gsc_asic_enable_irq(irq);
	146	return 0;
	147	}
	148
	149	static struct hw_interrupt_type gsc_asic_interrupt_type = {
	150	.typename = "GSC-ASIC",
	151	.startup = gsc_asic_startup_irq,
	152	.shutdown = gsc_asic_disable_irq,
	153	.enable = gsc_asic_enable_irq,
	154	.disable = gsc_asic_disable_irq,
	155	.ack = no_ack_irq,
	156	.end = no_end_irq,
	157	};
	158
	159	int gsc_assign_irq(struct hw_interrupt_type type, void data)
	160	{
	161	static int irq = GSC_IRQ_BASE;
	162
	163	if (irq > GSC_IRQ_MAX)
	164	return NO_IRQ;
	165
d1bef4ed IM	166	irq_desc[irq].chip = type;
d1bef4ed IM	167	irq_desc[irq].chip_data = data;
1da177e4 LT	168	return irq++;
	169	}
	170
	171	void gsc_asic_assign_irq(struct gsc_asic asic, int local_irq, int irqp)
	172	{
	173	int irq = asic->global_irq[local_irq];
	174
	175	if (irq <= 0) {
	176	irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
	177	if (irq == NO_IRQ)
	178	return;
	179
	180	asic->global_irq[local_irq] = irq;
	181	}
	182	*irqp = irq;
	183	}
	184
56583747 MW	185	static struct device next_device(struct klist_iter i)
	186	{
	187	struct klist_node * n = klist_next(i);
	188	return n ? container_of(n, struct device, knode_parent) : NULL;
	189	}
	190
1da177e4 LT	191	void gsc_fixup_irqs(struct parisc_device parent, void ctrl,
	192	void (choose_irq)(struct parisc_device , void *))
	193	{
	194	struct device *dev;
56583747	195	struct klist_iter i;
1da177e4	196
56583747 MW	197	klist_iter_init(&parent->dev.klist_children, &i);
56583747 MW	198	while ((dev = next_device(&i))) {
1da177e4 LT	199	struct parisc_device *padev = to_parisc_device(dev);
	200
	201	/* work-around for 715/64 and others which have parent
	202	at path [5] and children at path [5/0/x] */
	203	if (padev->id.hw_type == HPHW_FAULTY)
	204	return gsc_fixup_irqs(padev, ctrl, choose_irq);
	205	choose_irq(padev, ctrl);
	206	}
56583747	207	klist_iter_exit(&i);
1da177e4 LT	208	}
	209
	210	int gsc_common_setup(struct parisc_device parent, struct gsc_asic gsc_asic)
	211	{
	212	struct resource *res;
	213	int i;
	214
	215	gsc_asic->gsc = parent;
	216
	217	/* Initialise local irq -> global irq mapping */
	218	for (i = 0; i < 32; i++) {
	219	gsc_asic->global_irq[i] = NO_IRQ;
	220	}
	221
	222	/* allocate resource region */
	223	res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
	224	if (res) {
	225	res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
	226	}
	227
	228	#if 0
	229	printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
	230	parent->irq, gsc_asic->eim);
	231	if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
	232	printk(" IMR is non-zero! (0x%x)",
	233	gsc_readl(gsc_asic->hpa + OFFSET_IMR));
	234	printk("\n");
	235	#endif
	236
	237	return 0;
	238	}
	239
	240	extern struct parisc_driver lasi_driver;
	241	extern struct parisc_driver asp_driver;
	242	extern struct parisc_driver wax_driver;
	243
	244	void __init gsc_init(void)
	245	{
	246	#ifdef CONFIG_GSC_LASI
	247	register_parisc_driver(&lasi_driver);
	248	register_parisc_driver(&asp_driver);
	249	#endif
	250	#ifdef CONFIG_GSC_WAX
	251	register_parisc_driver(&wax_driver);
	252	#endif
	253	}