[mirror_ubuntu-jammy-kernel.git] / drivers / parisc / gsc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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
 */

#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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* Interrupt management for most GSC and related devices.
	4	*
	5	* (c) Copyright 1999 Alex deVries for The Puffin Group
	6	* (c) Copyright 1999 Grant Grundler for Hewlett-Packard
	7	* (c) Copyright 1999 Matthew Wilcox
	8	* (c) Copyright 2000 Helge Deller
	9	* (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
1da177e4 LT	10	*/
	11
	12	#include <linux/bitops.h>
1da177e4 LT	13	#include <linux/errno.h>
	14	#include <linux/init.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/ioport.h>
	17	#include <linux/module.h>
1da177e4 LT	18	#include <linux/types.h>
	19
	20	#include <asm/hardware.h>
	21	#include <asm/io.h>
	22
	23	#include "gsc.h"
	24
	25	#undef DEBUG
	26
	27	#ifdef DEBUG
	28	#define DEBPRINTK printk
	29	#else
	30	#define DEBPRINTK(x,...)
	31	#endif
	32
	33	int gsc_alloc_irq(struct gsc_irq *i)
	34	{
	35	int irq = txn_alloc_irq(GSC_EIM_WIDTH);
	36	if (irq < 0) {
	37	printk("cannot get irq\n");
	38	return irq;
	39	}
	40
	41	i->txn_addr = txn_alloc_addr(irq);
	42	i->txn_data = txn_alloc_data(irq);
	43	i->irq = irq;
	44
	45	return irq;
	46	}
	47
	48	int gsc_claim_irq(struct gsc_irq *i, int irq)
	49	{
	50	int c = irq;
	51
	52	irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
	53
	54	irq = txn_claim_irq(irq);
	55	if (irq < 0) {
	56	printk("cannot claim irq %d\n", c);
	57	return irq;
	58	}
	59
	60	i->txn_addr = txn_alloc_addr(irq);
	61	i->txn_data = txn_alloc_data(irq);
	62	i->irq = irq;
	63
	64	return irq;
	65	}
	66
	67	EXPORT_SYMBOL(gsc_alloc_irq);
	68	EXPORT_SYMBOL(gsc_claim_irq);
	69
	70	/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */
7d12e780	71	irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
1da177e4 LT	72	{
	73	unsigned long irr;
	74	struct gsc_asic *gsc_asic = dev;
	75
	76	irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
	77	if (irr == 0)
	78	return IRQ_NONE;
	79
	80	DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
	81
	82	do {
	83	int local_irq = __ffs(irr);
	84	unsigned int irq = gsc_asic->global_irq[local_irq];
ba20085c	85	generic_handle_irq(irq);
1da177e4 LT	86	irr &= ~(1 << local_irq);
	87	} while (irr);
	88
	89	return IRQ_HANDLED;
	90	}
	91
	92	int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
	93	{
	94	int local_irq;
	95
	96	for (local_irq = 0; local_irq < limit; local_irq++) {
	97	if (global_irqs[local_irq] == irq)
	98	return local_irq;
	99	}
	100
	101	return NO_IRQ;
	102	}
	103
4c4231ea	104	static void gsc_asic_mask_irq(struct irq_data *d)
1da177e4	105	{
4c4231ea TG	106	struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
4c4231ea TG	107	int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
1da177e4 LT	108	u32 imr;
1da177e4 LT	109
4c4231ea	110	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
1da177e4 LT	111	irq_dev->name, imr);
	112
	113	/* Disable the IRQ line by clearing the bit in the IMR */
	114	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	115	imr &= ~(1 << local_irq);
	116	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	117	}
	118
4c4231ea	119	static void gsc_asic_unmask_irq(struct irq_data *d)
1da177e4	120	{
4c4231ea TG	121	struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d);
4c4231ea TG	122	int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32);
1da177e4 LT	123	u32 imr;
1da177e4 LT	124
4c4231ea	125	DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->irq,
1da177e4 LT	126	irq_dev->name, imr);
	127
	128	/* Enable the IRQ line by setting the bit in the IMR */
	129	imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
	130	imr \|= 1 << local_irq;
	131	gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
	132	/*
	133	* FIXME: read IPR to make sure the IRQ isn't already pending.
	134	* If so, we need to read IRR and manually call do_irq().
	135	*/
	136	}
	137
dfe07565	138	static struct irq_chip gsc_asic_interrupt_type = {
4c4231ea TG	139	.name = "GSC-ASIC",
	140	.irq_unmask = gsc_asic_unmask_irq,
	141	.irq_mask = gsc_asic_mask_irq,
1da177e4 LT	142	};
1da177e4 LT	143
dfe07565	144	int gsc_assign_irq(struct irq_chip type, void data)
1da177e4 LT	145	{
	146	static int irq = GSC_IRQ_BASE;
	147
	148	if (irq > GSC_IRQ_MAX)
	149	return NO_IRQ;
	150
e2f571d2 TG	151	irq_set_chip_and_handler(irq, type, handle_simple_irq);
e2f571d2 TG	152	irq_set_chip_data(irq, data);
ba20085c	153
1da177e4 LT	154	return irq++;
	155	}
	156
	157	void gsc_asic_assign_irq(struct gsc_asic asic, int local_irq, int irqp)
	158	{
	159	int irq = asic->global_irq[local_irq];
	160
	161	if (irq <= 0) {
	162	irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
	163	if (irq == NO_IRQ)
	164	return;
	165
	166	asic->global_irq[local_irq] = irq;
	167	}
	168	*irqp = irq;
	169	}
	170
bfe4f4f8 JB	171	struct gsc_fixup_struct {
	172	void (choose_irq)(struct parisc_device , void *);
	173	void *ctrl;
	174	};
	175
	176	static int gsc_fixup_irqs_callback(struct device dev, void data)
56583747	177	{
bfe4f4f8 JB	178	struct parisc_device *padev = to_parisc_device(dev);
	179	struct gsc_fixup_struct *gf = data;
	180
	181	/* work-around for 715/64 and others which have parent
	182	at path [5] and children at path [5/0/x] */
	183	if (padev->id.hw_type == HPHW_FAULTY)
	184	gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
	185	gf->choose_irq(padev, gf->ctrl);
	186
	187	return 0;
56583747 MW	188	}
56583747 MW	189
1da177e4 LT	190	void gsc_fixup_irqs(struct parisc_device parent, void ctrl,
	191	void (choose_irq)(struct parisc_device , void *))
	192	{
bfe4f4f8 JB	193	struct gsc_fixup_struct data = {
	194	.choose_irq = choose_irq,
	195	.ctrl = ctrl,
	196	};
	197
	198	device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
1da177e4 LT	199	}
	200
	201	int gsc_common_setup(struct parisc_device parent, struct gsc_asic gsc_asic)
	202	{
	203	struct resource *res;
	204	int i;
	205
	206	gsc_asic->gsc = parent;
	207
	208	/* Initialise local irq -> global irq mapping */
	209	for (i = 0; i < 32; i++) {
	210	gsc_asic->global_irq[i] = NO_IRQ;
	211	}
	212
	213	/* allocate resource region */
	214	res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
	215	if (res) {
	216	res->flags = IORESOURCE_MEM; /* do not mark it busy ! */
	217	}
	218
	219	#if 0
	220	printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
	221	parent->irq, gsc_asic->eim);
	222	if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
	223	printk(" IMR is non-zero! (0x%x)",
	224	gsc_readl(gsc_asic->hpa + OFFSET_IMR));
	225	printk("\n");
	226	#endif
	227
	228	return 0;
	229	}
	230
	231	extern struct parisc_driver lasi_driver;
	232	extern struct parisc_driver asp_driver;
	233	extern struct parisc_driver wax_driver;
	234
	235	void __init gsc_init(void)
	236	{
	237	#ifdef CONFIG_GSC_LASI
	238	register_parisc_driver(&lasi_driver);
	239	register_parisc_driver(&asp_driver);
	240	#endif
	241	#ifdef CONFIG_GSC_WAX
	242	register_parisc_driver(&wax_driver);
	243	#endif
	244	}