[people/arne_f/kernel.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/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];
		generic_handle_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_mask_irq(struct irq_data *d)
{
	struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
	int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
	u32 imr;

	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->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_unmask_irq(struct irq_data *d)
{
	struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
	int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
	u32 imr;

	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->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 struct irq_chip gsc_asic_interrupt_type = {
	.name		=	"GSC-ASIC",
	.irq_unmask	=	gsc_asic_unmask_irq,
	.irq_mask	=	gsc_asic_mask_irq,
};

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

	if (irq > GSC_IRQ_MAX)
		return NO_IRQ;

	irq_set_chip_and_handler(irq, type, handle_simple_irq);
	irq_set_chip_data(irq, 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;
}

struct gsc_fixup_struct {
	void (*choose_irq)(struct parisc_device *, void *);
	void *ctrl;
};

static int gsc_fixup_irqs_callback(struct device *dev, void *data)
{
	struct parisc_device *padev = to_parisc_device(dev);
	struct gsc_fixup_struct *gf = data;

	/* 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)
		gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
	gf->choose_irq(padev, gf->ctrl);

	return 0;
}

void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
			void (*choose_irq)(struct parisc_device *, void *))
{
	struct gsc_fixup_struct data = {
		.choose_irq	= choose_irq,
		.ctrl		= ctrl,
	};

	device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
}

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>
1da177e4 LT	22	#include <linux/types.h>
	23
	24	#include <asm/hardware.h>
	25	#include <asm/io.h>
	26
	27	#include "gsc.h"
	28
	29	#undef DEBUG
	30
	31	#ifdef DEBUG
	32	#define DEBPRINTK printk
	33	#else
	34	#define DEBPRINTK(x,...)
	35	#endif
	36
	37	int gsc_alloc_irq(struct gsc_irq *i)
	38	{
	39	int irq = txn_alloc_irq(GSC_EIM_WIDTH);
	40	if (irq < 0) {
	41	printk("cannot get irq\n");
	42	return irq;
	43	}
	44
	45	i->txn_addr = txn_alloc_addr(irq);
	46	i->txn_data = txn_alloc_data(irq);
	47	i->irq = irq;
	48
	49	return irq;
	50	}
	51
	52	int gsc_claim_irq(struct gsc_irq *i, int irq)
	53	{
	54	int c = irq;
	55
	56	irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
	57
	58	irq = txn_claim_irq(irq);
	59	if (irq < 0) {
	60	printk("cannot claim irq %d\n", c);
	61	return irq;
	62	}
	63
	64	i->txn_addr = txn_alloc_addr(irq);
	65	i->txn_data = txn_alloc_data(irq);
	66	i->irq = irq;
	67
	68	return irq;
	69	}
	70
	71	EXPORT_SYMBOL(gsc_alloc_irq);
	72	EXPORT_SYMBOL(gsc_claim_irq);
	73
	74	/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
7d12e780	75	irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
1da177e4 LT	76	{
	77	unsigned long irr;
	78	struct gsc_asic *gsc_asic = dev;
	79
	80	irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
	81	if (irr == 0)
	82	return IRQ_NONE;
	83
	84	DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
	85
	86	do {
	87	int local_irq = __ffs(irr);
	88	unsigned int irq = gsc_asic->global_irq[local_irq];
ba20085c	89	generic_handle_irq(irq);
1da177e4 LT	90	irr &= ~(1 << local_irq);
	91	} while (irr);
	92
	93	return IRQ_HANDLED;
	94	}
	95
	96	int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
	97	{
	98	int local_irq;
	99
	100	for (local_irq = 0; local_irq < limit; local_irq++) {
	101	if (global_irqs[local_irq] == irq)
	102	return local_irq;
	103	}
	104
	105	return NO_IRQ;
	106	}
	107
4c4231ea	108	static void gsc_asic_mask_irq(struct irq_data *d)
1da177e4	109	{
4c4231ea TG	110	struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
4c4231ea TG	111	int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
1da177e4 LT	112	u32 imr;
1da177e4 LT	113
4c4231ea	114	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
1da177e4 LT	115	irq_dev->name, imr);
	116
	117	/* Disable the IRQ line by clearing the bit in the IMR */
	118	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	119	imr &= ~(1 << local_irq);
	120	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	121	}
	122
4c4231ea	123	static void gsc_asic_unmask_irq(struct irq_data *d)
1da177e4	124	{
4c4231ea TG	125	struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
4c4231ea TG	126	int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
1da177e4 LT	127	u32 imr;
1da177e4 LT	128
4c4231ea	129	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
1da177e4 LT	130	irq_dev->name, imr);
	131
	132	/* Enable the IRQ line by setting the bit in the IMR */
	133	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	134	imr \|= 1 << local_irq;
	135	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	136	/*
	137	* FIXME: read IPR to make sure the IRQ isn't already pending.
	138	* If so, we need to read IRR and manually call do_irq().
	139	*/
	140	}
	141
dfe07565	142	static struct irq_chip gsc_asic_interrupt_type = {
4c4231ea TG	143	.name = "GSC-ASIC",
	144	.irq_unmask = gsc_asic_unmask_irq,
	145	.irq_mask = gsc_asic_mask_irq,
1da177e4 LT	146	};
1da177e4 LT	147
dfe07565	148	int gsc_assign_irq(struct irq_chip type, void data)
1da177e4 LT	149	{
	150	static int irq = GSC_IRQ_BASE;
	151
	152	if (irq > GSC_IRQ_MAX)
	153	return NO_IRQ;
	154
e2f571d2 TG	155	irq_set_chip_and_handler(irq, type, handle_simple_irq);
e2f571d2 TG	156	irq_set_chip_data(irq, data);
ba20085c	157
1da177e4 LT	158	return irq++;
	159	}
	160
	161	void gsc_asic_assign_irq(struct gsc_asic asic, int local_irq, int irqp)
	162	{
	163	int irq = asic->global_irq[local_irq];
	164
	165	if (irq <= 0) {
	166	irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
	167	if (irq == NO_IRQ)
	168	return;
	169
	170	asic->global_irq[local_irq] = irq;
	171	}
	172	*irqp = irq;
	173	}
	174
bfe4f4f8 JB	175	struct gsc_fixup_struct {
	176	void (choose_irq)(struct parisc_device , void *);
	177	void *ctrl;
	178	};
	179
	180	static int gsc_fixup_irqs_callback(struct device dev, void data)
56583747	181	{
bfe4f4f8 JB	182	struct parisc_device *padev = to_parisc_device(dev);
	183	struct gsc_fixup_struct *gf = data;
	184
	185	/* work-around for 715/64 and others which have parent
	186	at path [5] and children at path [5/0/x] */
	187	if (padev->id.hw_type == HPHW_FAULTY)
	188	gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
	189	gf->choose_irq(padev, gf->ctrl);
	190
	191	return 0;
56583747 MW	192	}
56583747 MW	193
1da177e4 LT	194	void gsc_fixup_irqs(struct parisc_device parent, void ctrl,
	195	void (choose_irq)(struct parisc_device , void *))
	196	{
bfe4f4f8 JB	197	struct gsc_fixup_struct data = {
	198	.choose_irq = choose_irq,
	199	.ctrl = ctrl,
	200	};
	201
	202	device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
1da177e4 LT	203	}
	204
	205	int gsc_common_setup(struct parisc_device parent, struct gsc_asic gsc_asic)
	206	{
	207	struct resource *res;
	208	int i;
	209
	210	gsc_asic->gsc = parent;
	211
	212	/* Initialise local irq -> global irq mapping */
	213	for (i = 0; i < 32; i++) {
	214	gsc_asic->global_irq[i] = NO_IRQ;
	215	}
	216
	217	/* allocate resource region */
	218	res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
	219	if (res) {
	220	res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
	221	}
	222
	223	#if 0
	224	printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
	225	parent->irq, gsc_asic->eim);
	226	if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
	227	printk(" IMR is non-zero! (0x%x)",
	228	gsc_readl(gsc_asic->hpa + OFFSET_IMR));
	229	printk("\n");
	230	#endif
	231
	232	return 0;
	233	}
	234
	235	extern struct parisc_driver lasi_driver;
	236	extern struct parisc_driver asp_driver;
	237	extern struct parisc_driver wax_driver;
	238
	239	void __init gsc_init(void)
	240	{
	241	#ifdef CONFIG_GSC_LASI
	242	register_parisc_driver(&lasi_driver);
	243	register_parisc_driver(&asp_driver);
	244	#endif
	245	#ifdef CONFIG_GSC_WAX
	246	register_parisc_driver(&wax_driver);
	247	#endif
	248	}