[mirror_ubuntu-artful-kernel.git] / drivers / irqchip / irq-orion.c

/*
 * Marvell Orion SoCs IRQ chip driver.
 *
 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2.  This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/io.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm/exception.h>
#include <asm/mach/irq.h>

#include "irqchip.h"

/*
 * Orion SoC main interrupt controller
 */
#define ORION_IRQS_PER_CHIP		32

#define ORION_IRQ_CAUSE			0x00
#define ORION_IRQ_MASK			0x04
#define ORION_IRQ_FIQ_MASK		0x08
#define ORION_IRQ_ENDP_MASK		0x0c

static struct irq_domain *orion_irq_domain;

static void
__exception_irq_entry orion_handle_irq(struct pt_regs *regs)
{
	struct irq_domain_chip_generic *dgc = orion_irq_domain->gc;
	int n, base = 0;

	for (n = 0; n < dgc->num_chips; n++, base += ORION_IRQS_PER_CHIP) {
		struct irq_chip_generic *gc =
			irq_get_domain_generic_chip(orion_irq_domain, base);
		u32 stat = readl_relaxed(gc->reg_base + ORION_IRQ_CAUSE) &
			gc->mask_cache;
		while (stat) {
			u32 hwirq = ffs(stat) - 1;
			u32 irq = irq_find_mapping(orion_irq_domain,
						   gc->irq_base + hwirq);
			handle_IRQ(irq, regs);
			stat &= ~(1 << hwirq);
		}
	}
}

static int __init orion_irq_init(struct device_node *np,
				 struct device_node *parent)
{
	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
	int n, ret, base, num_chips = 0;
	struct resource r;

	/* count number of irq chips by valid reg addresses */
	while (of_address_to_resource(np, num_chips, &r) == 0)
		num_chips++;

	orion_irq_domain = irq_domain_add_linear(np,
				num_chips * ORION_IRQS_PER_CHIP,
				&irq_generic_chip_ops, NULL);
	if (!orion_irq_domain)
		panic("%s: unable to add irq domain\n", np->name);

	ret = irq_alloc_domain_generic_chips(orion_irq_domain,
				ORION_IRQS_PER_CHIP, 1, np->name,
				handle_level_irq, clr, 0,
				IRQ_GC_INIT_MASK_CACHE);
	if (ret)
		panic("%s: unable to alloc irq domain gc\n", np->name);

	for (n = 0, base = 0; n < num_chips; n++, base += ORION_IRQS_PER_CHIP) {
		struct irq_chip_generic *gc =
			irq_get_domain_generic_chip(orion_irq_domain, base);

		of_address_to_resource(np, n, &r);

		if (!request_mem_region(r.start, resource_size(&r), np->name))
			panic("%s: unable to request mem region %d",
			      np->name, n);

		gc->reg_base = ioremap(r.start, resource_size(&r));
		if (!gc->reg_base)
			panic("%s: unable to map resource %d", np->name, n);

		gc->chip_types[0].regs.mask = ORION_IRQ_MASK;
		gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
		gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;

		/* mask all interrupts */
		writel(0, gc->reg_base + ORION_IRQ_MASK);
	}

	set_handle_irq(orion_handle_irq);
	return 0;
}
IRQCHIP_DECLARE(orion_intc, "marvell,orion-intc", orion_irq_init);

/*
 * Orion SoC bridge interrupt controller
 */
#define ORION_BRIDGE_IRQ_CAUSE	0x00
#define ORION_BRIDGE_IRQ_MASK	0x04

static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	struct irq_domain *d = irq_get_handler_data(irq);

	struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0);
	u32 stat = readl_relaxed(gc->reg_base + ORION_BRIDGE_IRQ_CAUSE) &
		   gc->mask_cache;

	while (stat) {
		u32 hwirq = ffs(stat) - 1;

		generic_handle_irq(irq_find_mapping(d, gc->irq_base + hwirq));
		stat &= ~(1 << hwirq);
	}
}

/*
 * Bridge IRQ_CAUSE is asserted regardless of IRQ_MASK register.
 * To avoid interrupt events on stale irqs, we clear them before unmask.
 */
static unsigned int orion_bridge_irq_startup(struct irq_data *d)
{
	struct irq_chip_type *ct = irq_data_get_chip_type(d);

	ct->chip.irq_ack(d);
	ct->chip.irq_unmask(d);
	return 0;
}

static int __init orion_bridge_irq_init(struct device_node *np,
					struct device_node *parent)
{
	unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
	struct resource r;
	struct irq_domain *domain;
	struct irq_chip_generic *gc;
	int ret, irq, nrirqs = 32;

	/* get optional number of interrupts provided */
	of_property_read_u32(np, "marvell,#interrupts", &nrirqs);

	domain = irq_domain_add_linear(np, nrirqs,
				       &irq_generic_chip_ops, NULL);
	if (!domain) {
		pr_err("%s: unable to add irq domain\n", np->name);
		return -ENOMEM;
	}

	ret = irq_alloc_domain_generic_chips(domain, nrirqs, 1, np->name,
			     handle_edge_irq, clr, 0, IRQ_GC_INIT_MASK_CACHE);
	if (ret) {
		pr_err("%s: unable to alloc irq domain gc\n", np->name);
		return ret;
	}

	ret = of_address_to_resource(np, 0, &r);
	if (ret) {
		pr_err("%s: unable to get resource\n", np->name);
		return ret;
	}

	if (!request_mem_region(r.start, resource_size(&r), np->name)) {
		pr_err("%s: unable to request mem region\n", np->name);
		return -ENOMEM;
	}

	/* Map the parent interrupt for the chained handler */
	irq = irq_of_parse_and_map(np, 0);
	if (irq <= 0) {
		pr_err("%s: unable to parse irq\n", np->name);
		return -EINVAL;
	}

	gc = irq_get_domain_generic_chip(domain, 0);
	gc->reg_base = ioremap(r.start, resource_size(&r));
	if (!gc->reg_base) {
		pr_err("%s: unable to map resource\n", np->name);
		return -ENOMEM;
	}

	gc->chip_types[0].regs.ack = ORION_BRIDGE_IRQ_CAUSE;
	gc->chip_types[0].regs.mask = ORION_BRIDGE_IRQ_MASK;
	gc->chip_types[0].chip.irq_startup = orion_bridge_irq_startup;
	gc->chip_types[0].chip.irq_ack = irq_gc_ack_clr_bit;
	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;

	/* mask and clear all interrupts */
	writel(0, gc->reg_base + ORION_BRIDGE_IRQ_MASK);
	writel(0, gc->reg_base + ORION_BRIDGE_IRQ_CAUSE);

	irq_set_handler_data(irq, domain);
	irq_set_chained_handler(irq, orion_bridge_irq_handler);

	return 0;
}
IRQCHIP_DECLARE(orion_bridge_intc,
		"marvell,orion-bridge-intc", orion_bridge_irq_init);
Commit	Line	Data
9dbd90f1 SH	1	/*
	2	* Marvell Orion SoCs IRQ chip driver.
	3	*
	4	* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
	5	*
	6	* This file is licensed under the terms of the GNU General Public
	7	* License version 2. This program is licensed "as is" without any
	8	* warranty of any kind, whether express or implied.
	9	*/
	10
	11	#include <linux/io.h>
	12	#include <linux/irq.h>
	13	#include <linux/of.h>
	14	#include <linux/of_address.h>
	15	#include <linux/of_irq.h>
	16	#include <asm/exception.h>
	17	#include <asm/mach/irq.h>
	18
	19	#include "irqchip.h"
	20
	21	/*
	22	* Orion SoC main interrupt controller
	23	*/
	24	#define ORION_IRQS_PER_CHIP 32
	25
	26	#define ORION_IRQ_CAUSE 0x00
	27	#define ORION_IRQ_MASK 0x04
	28	#define ORION_IRQ_FIQ_MASK 0x08
	29	#define ORION_IRQ_ENDP_MASK 0x0c
	30
	31	static struct irq_domain *orion_irq_domain;
	32
8783dd3a	33	static void
9dbd90f1 SH	34	__exception_irq_entry orion_handle_irq(struct pt_regs *regs)
	35	{
	36	struct irq_domain_chip_generic *dgc = orion_irq_domain->gc;
	37	int n, base = 0;
	38
	39	for (n = 0; n < dgc->num_chips; n++, base += ORION_IRQS_PER_CHIP) {
	40	struct irq_chip_generic *gc =
	41	irq_get_domain_generic_chip(orion_irq_domain, base);
	42	u32 stat = readl_relaxed(gc->reg_base + ORION_IRQ_CAUSE) &
	43	gc->mask_cache;
	44	while (stat) {
	45	u32 hwirq = ffs(stat) - 1;
	46	u32 irq = irq_find_mapping(orion_irq_domain,
	47	gc->irq_base + hwirq);
	48	handle_IRQ(irq, regs);
	49	stat &= ~(1 << hwirq);
	50	}
	51	}
	52	}
	53
	54	static int __init orion_irq_init(struct device_node *np,
	55	struct device_node *parent)
	56	{
	57	unsigned int clr = IRQ_NOREQUEST \| IRQ_NOPROBE \| IRQ_NOAUTOEN;
	58	int n, ret, base, num_chips = 0;
	59	struct resource r;
	60
	61	/* count number of irq chips by valid reg addresses */
	62	while (of_address_to_resource(np, num_chips, &r) == 0)
	63	num_chips++;
	64
	65	orion_irq_domain = irq_domain_add_linear(np,
	66	num_chips * ORION_IRQS_PER_CHIP,
	67	&irq_generic_chip_ops, NULL);
	68	if (!orion_irq_domain)
	69	panic("%s: unable to add irq domain\n", np->name);
	70
	71	ret = irq_alloc_domain_generic_chips(orion_irq_domain,
	72	ORION_IRQS_PER_CHIP, 1, np->name,
	73	handle_level_irq, clr, 0,
	74	IRQ_GC_INIT_MASK_CACHE);
	75	if (ret)
	76	panic("%s: unable to alloc irq domain gc\n", np->name);
	77
	78	for (n = 0, base = 0; n < num_chips; n++, base += ORION_IRQS_PER_CHIP) {
	79	struct irq_chip_generic *gc =
	80	irq_get_domain_generic_chip(orion_irq_domain, base);
	81
	82	of_address_to_resource(np, n, &r);
	83
	84	if (!request_mem_region(r.start, resource_size(&r), np->name))
	85	panic("%s: unable to request mem region %d",
	86	np->name, n);
	87
	88	gc->reg_base = ioremap(r.start, resource_size(&r));
	89	if (!gc->reg_base)
	90	panic("%s: unable to map resource %d", np->name, n);
	91
	92	gc->chip_types[0].regs.mask = ORION_IRQ_MASK;
	93	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
	94	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
	95
	96	/* mask all interrupts */
	97	writel(0, gc->reg_base + ORION_IRQ_MASK);
98	}
99
100	set_handle_irq(orion_handle_irq);
101	return 0;
102	}
103	IRQCHIP_DECLARE(orion_intc, "marvell,orion-intc", orion_irq_init);
104
105	/*
106	* Orion SoC bridge interrupt controller
107	*/
108	#define ORION_BRIDGE_IRQ_CAUSE 0x00
109	#define ORION_BRIDGE_IRQ_MASK 0x04
110
111	static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc *desc)
112	{
113	struct irq_domain *d = irq_get_handler_data(irq);
d86e9af6 AL	114
d86e9af6 AL	115	struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0);
9dbd90f1 SH	116	u32 stat = readl_relaxed(gc->reg_base + ORION_BRIDGE_IRQ_CAUSE) &
	117	gc->mask_cache;
	118
	119	while (stat) {
	120	u32 hwirq = ffs(stat) - 1;
	121
	122	generic_handle_irq(irq_find_mapping(d, gc->irq_base + hwirq));
	123	stat &= ~(1 << hwirq);
	124	}
	125	}
	126
e0318ec3 SH	127	/*
	128	* Bridge IRQ_CAUSE is asserted regardless of IRQ_MASK register.
	129	* To avoid interrupt events on stale irqs, we clear them before unmask.
	130	*/
	131	static unsigned int orion_bridge_irq_startup(struct irq_data *d)
	132	{
	133	struct irq_chip_type *ct = irq_data_get_chip_type(d);
	134
	135	ct->chip.irq_ack(d);
	136	ct->chip.irq_unmask(d);
	137	return 0;
	138	}
	139
9dbd90f1 SH	140	static int __init orion_bridge_irq_init(struct device_node *np,
	141	struct device_node *parent)
	142	{
	143	unsigned int clr = IRQ_NOREQUEST \| IRQ_NOPROBE \| IRQ_NOAUTOEN;
	144	struct resource r;
	145	struct irq_domain *domain;
	146	struct irq_chip_generic *gc;
	147	int ret, irq, nrirqs = 32;
	148
	149	/* get optional number of interrupts provided */
	150	of_property_read_u32(np, "marvell,#interrupts", &nrirqs);
	151
	152	domain = irq_domain_add_linear(np, nrirqs,
	153	&irq_generic_chip_ops, NULL);
	154	if (!domain) {
	155	pr_err("%s: unable to add irq domain\n", np->name);
	156	return -ENOMEM;
	157	}
	158
	159	ret = irq_alloc_domain_generic_chips(domain, nrirqs, 1, np->name,
5f40067f	160	handle_edge_irq, clr, 0, IRQ_GC_INIT_MASK_CACHE);
9dbd90f1 SH	161	if (ret) {
	162	pr_err("%s: unable to alloc irq domain gc\n", np->name);
	163	return ret;
	164	}
	165
	166	ret = of_address_to_resource(np, 0, &r);
	167	if (ret) {
	168	pr_err("%s: unable to get resource\n", np->name);
	169	return ret;
	170	}
	171
	172	if (!request_mem_region(r.start, resource_size(&r), np->name)) {
	173	pr_err("%s: unable to request mem region\n", np->name);
	174	return -ENOMEM;
	175	}
	176
	177	/* Map the parent interrupt for the chained handler */
	178	irq = irq_of_parse_and_map(np, 0);
	179	if (irq <= 0) {
	180	pr_err("%s: unable to parse irq\n", np->name);
	181	return -EINVAL;
	182	}
	183
	184	gc = irq_get_domain_generic_chip(domain, 0);
	185	gc->reg_base = ioremap(r.start, resource_size(&r));
	186	if (!gc->reg_base) {
	187	pr_err("%s: unable to map resource\n", np->name);
	188	return -ENOMEM;
	189	}
	190
	191	gc->chip_types[0].regs.ack = ORION_BRIDGE_IRQ_CAUSE;
	192	gc->chip_types[0].regs.mask = ORION_BRIDGE_IRQ_MASK;
e0318ec3	193	gc->chip_types[0].chip.irq_startup = orion_bridge_irq_startup;
9dbd90f1 SH	194	gc->chip_types[0].chip.irq_ack = irq_gc_ack_clr_bit;
	195	gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
	196	gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
	197
7b119fd1	198	/* mask and clear all interrupts */
9dbd90f1	199	writel(0, gc->reg_base + ORION_BRIDGE_IRQ_MASK);
7b119fd1	200	writel(0, gc->reg_base + ORION_BRIDGE_IRQ_CAUSE);
9dbd90f1 SH	201
	202	irq_set_handler_data(irq, domain);
	203	irq_set_chained_handler(irq, orion_bridge_irq_handler);
	204
	205	return 0;
	206	}
	207	IRQCHIP_DECLARE(orion_bridge_intc,
	208	"marvell,orion-bridge-intc", orion_bridge_irq_init);