[linux-2.6-block.git] / drivers / irqchip / irq-xtensa-mx.c

/*
 * Xtensa MX interrupt distributor
 *
 * Copyright (C) 2002 - 2013 Tensilica, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of.h>

#include <asm/mxregs.h>

#define HW_IRQ_IPI_COUNT 2
#define HW_IRQ_MX_BASE 2
#define HW_IRQ_EXTERN_BASE 3

static DEFINE_PER_CPU(unsigned int, cached_irq_mask);

static int xtensa_mx_irq_map(struct irq_domain *d, unsigned int irq,
		irq_hw_number_t hw)
{
	if (hw < HW_IRQ_IPI_COUNT) {
		struct irq_chip *irq_chip = d->host_data;
		irq_set_chip_and_handler_name(irq, irq_chip,
				handle_percpu_irq, "ipi");
		irq_set_status_flags(irq, IRQ_LEVEL);
		return 0;
	}
	irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
	return xtensa_irq_map(d, irq, hw);
}

/*
 * Device Tree IRQ specifier translation function which works with one or
 * two cell bindings. First cell value maps directly to the hwirq number.
 * Second cell if present specifies whether hwirq number is external (1) or
 * internal (0).
 */
static int xtensa_mx_irq_domain_xlate(struct irq_domain *d,
		struct device_node *ctrlr,
		const u32 *intspec, unsigned int intsize,
		unsigned long *out_hwirq, unsigned int *out_type)
{
	return xtensa_irq_domain_xlate(intspec, intsize,
			intspec[0], intspec[0] + HW_IRQ_EXTERN_BASE,
			out_hwirq, out_type);
}

static const struct irq_domain_ops xtensa_mx_irq_domain_ops = {
	.xlate = xtensa_mx_irq_domain_xlate,
	.map = xtensa_mx_irq_map,
};

void secondary_init_irq(void)
{
	__this_cpu_write(cached_irq_mask,
			XCHAL_INTTYPE_MASK_EXTERN_EDGE |
			XCHAL_INTTYPE_MASK_EXTERN_LEVEL);
	xtensa_set_sr(XCHAL_INTTYPE_MASK_EXTERN_EDGE |
			XCHAL_INTTYPE_MASK_EXTERN_LEVEL, intenable);
}

static void xtensa_mx_irq_mask(struct irq_data *d)
{
	unsigned int mask = 1u << d->hwirq;

	if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
		    XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) {
		unsigned int ext_irq = xtensa_get_ext_irq_no(d->hwirq);

		if (ext_irq >= HW_IRQ_MX_BASE) {
			set_er(1u << (ext_irq - HW_IRQ_MX_BASE), MIENG);
			return;
		}
	}
	mask = __this_cpu_read(cached_irq_mask) & ~mask;
	__this_cpu_write(cached_irq_mask, mask);
	xtensa_set_sr(mask, intenable);
}

static void xtensa_mx_irq_unmask(struct irq_data *d)
{
	unsigned int mask = 1u << d->hwirq;

	if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
		    XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) {
		unsigned int ext_irq = xtensa_get_ext_irq_no(d->hwirq);

		if (ext_irq >= HW_IRQ_MX_BASE) {
			set_er(1u << (ext_irq - HW_IRQ_MX_BASE), MIENGSET);
			return;
		}
	}
	mask |= __this_cpu_read(cached_irq_mask);
	__this_cpu_write(cached_irq_mask, mask);
	xtensa_set_sr(mask, intenable);
}

static void xtensa_mx_irq_enable(struct irq_data *d)
{
	xtensa_mx_irq_unmask(d);
}

static void xtensa_mx_irq_disable(struct irq_data *d)
{
	xtensa_mx_irq_mask(d);
}

static void xtensa_mx_irq_ack(struct irq_data *d)
{
	xtensa_set_sr(1 << d->hwirq, intclear);
}

static int xtensa_mx_irq_retrigger(struct irq_data *d)
{
	unsigned int mask = 1u << d->hwirq;

	if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
		return 0;
	xtensa_set_sr(mask, intset);
	return 1;
}

static int xtensa_mx_irq_set_affinity(struct irq_data *d,
		const struct cpumask *dest, bool force)
{
	int cpu = cpumask_any_and(dest, cpu_online_mask);
	unsigned mask = 1u << cpu;

	set_er(mask, MIROUT(d->hwirq - HW_IRQ_MX_BASE));
	irq_data_update_effective_affinity(d, cpumask_of(cpu));

	return 0;

}

static struct irq_chip xtensa_mx_irq_chip = {
	.name		= "xtensa-mx",
	.irq_enable	= xtensa_mx_irq_enable,
	.irq_disable	= xtensa_mx_irq_disable,
	.irq_mask	= xtensa_mx_irq_mask,
	.irq_unmask	= xtensa_mx_irq_unmask,
	.irq_ack	= xtensa_mx_irq_ack,
	.irq_retrigger	= xtensa_mx_irq_retrigger,
	.irq_set_affinity = xtensa_mx_irq_set_affinity,
};

int __init xtensa_mx_init_legacy(struct device_node *interrupt_parent)
{
	struct irq_domain *root_domain =
		irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
				&xtensa_mx_irq_domain_ops,
				&xtensa_mx_irq_chip);
	irq_set_default_host(root_domain);
	secondary_init_irq();
	return 0;
}

static int __init xtensa_mx_init(struct device_node *np,
		struct device_node *interrupt_parent)
{
	struct irq_domain *root_domain =
		irq_domain_add_linear(np, NR_IRQS, &xtensa_mx_irq_domain_ops,
				&xtensa_mx_irq_chip);
	irq_set_default_host(root_domain);
	secondary_init_irq();
	return 0;
}
IRQCHIP_DECLARE(xtensa_mx_irq_chip, "cdns,xtensa-mx", xtensa_mx_init);
Commit	Line	Data
26a8e96a MF	1	/*
	2	* Xtensa MX interrupt distributor
	3	*
	4	* Copyright (C) 2002 - 2013 Tensilica, Inc.
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	#include <linux/interrupt.h>
	12	#include <linux/irqdomain.h>
	13	#include <linux/irq.h>
41a83e06	14	#include <linux/irqchip.h>
26a8e96a MF	15	#include <linux/of.h>
	16
	17	#include <asm/mxregs.h>
	18
26a8e96a MF	19	#define HW_IRQ_IPI_COUNT 2
	20	#define HW_IRQ_MX_BASE 2
	21	#define HW_IRQ_EXTERN_BASE 3
	22
	23	static DEFINE_PER_CPU(unsigned int, cached_irq_mask);
	24
	25	static int xtensa_mx_irq_map(struct irq_domain *d, unsigned int irq,
	26	irq_hw_number_t hw)
	27	{
	28	if (hw < HW_IRQ_IPI_COUNT) {
	29	struct irq_chip *irq_chip = d->host_data;
	30	irq_set_chip_and_handler_name(irq, irq_chip,
	31	handle_percpu_irq, "ipi");
	32	irq_set_status_flags(irq, IRQ_LEVEL);
	33	return 0;
	34	}
50091212	35	irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
26a8e96a MF	36	return xtensa_irq_map(d, irq, hw);
	37	}
	38
	39	/*
	40	* Device Tree IRQ specifier translation function which works with one or
	41	* two cell bindings. First cell value maps directly to the hwirq number.
	42	* Second cell if present specifies whether hwirq number is external (1) or
	43	* internal (0).
	44	*/
	45	static int xtensa_mx_irq_domain_xlate(struct irq_domain *d,
	46	struct device_node *ctrlr,
	47	const u32 *intspec, unsigned int intsize,
	48	unsigned long out_hwirq, unsigned int out_type)
	49	{
	50	return xtensa_irq_domain_xlate(intspec, intsize,
	51	intspec[0], intspec[0] + HW_IRQ_EXTERN_BASE,
	52	out_hwirq, out_type);
	53	}
	54
	55	static const struct irq_domain_ops xtensa_mx_irq_domain_ops = {
	56	.xlate = xtensa_mx_irq_domain_xlate,
	57	.map = xtensa_mx_irq_map,
	58	};
	59
	60	void secondary_init_irq(void)
	61	{
	62	__this_cpu_write(cached_irq_mask,
	63	XCHAL_INTTYPE_MASK_EXTERN_EDGE \|
	64	XCHAL_INTTYPE_MASK_EXTERN_LEVEL);
cad6fade	65	xtensa_set_sr(XCHAL_INTTYPE_MASK_EXTERN_EDGE \|
26a8e96a MF	66	XCHAL_INTTYPE_MASK_EXTERN_LEVEL, intenable);
	67	}
	68
	69	static void xtensa_mx_irq_mask(struct irq_data *d)
	70	{
	71	unsigned int mask = 1u << d->hwirq;
	72
	73	if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE \|
eb271710 MF	74	XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) {
	75	unsigned int ext_irq = xtensa_get_ext_irq_no(d->hwirq);
	76
	77	if (ext_irq >= HW_IRQ_MX_BASE) {
	78	set_er(1u << (ext_irq - HW_IRQ_MX_BASE), MIENG);
	79	return;
	80	}
26a8e96a	81	}
eb271710 MF	82	mask = __this_cpu_read(cached_irq_mask) & ~mask;
	83	__this_cpu_write(cached_irq_mask, mask);
	84	xtensa_set_sr(mask, intenable);
26a8e96a MF	85	}
	86
	87	static void xtensa_mx_irq_unmask(struct irq_data *d)
	88	{
	89	unsigned int mask = 1u << d->hwirq;
	90
	91	if (mask & (XCHAL_INTTYPE_MASK_EXTERN_EDGE \|
eb271710 MF	92	XCHAL_INTTYPE_MASK_EXTERN_LEVEL)) {
	93	unsigned int ext_irq = xtensa_get_ext_irq_no(d->hwirq);
	94
	95	if (ext_irq >= HW_IRQ_MX_BASE) {
	96	set_er(1u << (ext_irq - HW_IRQ_MX_BASE), MIENGSET);
	97	return;
	98	}
26a8e96a	99	}
eb271710 MF	100	mask \|= __this_cpu_read(cached_irq_mask);
	101	__this_cpu_write(cached_irq_mask, mask);
	102	xtensa_set_sr(mask, intenable);
26a8e96a MF	103	}
	104
	105	static void xtensa_mx_irq_enable(struct irq_data *d)
	106	{
26a8e96a MF	107	xtensa_mx_irq_unmask(d);
	108	}
	109
	110	static void xtensa_mx_irq_disable(struct irq_data *d)
	111	{
	112	xtensa_mx_irq_mask(d);
26a8e96a MF	113	}
	114
	115	static void xtensa_mx_irq_ack(struct irq_data *d)
	116	{
cad6fade	117	xtensa_set_sr(1 << d->hwirq, intclear);
26a8e96a MF	118	}
	119
	120	static int xtensa_mx_irq_retrigger(struct irq_data *d)
	121	{
bb665236 MF	122	unsigned int mask = 1u << d->hwirq;
	123
	124	if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
	125	return 0;
	126	xtensa_set_sr(mask, intset);
26a8e96a MF	127	return 1;
	128	}
	129
	130	static int xtensa_mx_irq_set_affinity(struct irq_data *d,
	131	const struct cpumask *dest, bool force)
	132	{
50091212 MZ	133	int cpu = cpumask_any_and(dest, cpu_online_mask);
50091212 MZ	134	unsigned mask = 1u << cpu;
26a8e96a MF	135
26a8e96a MF	136	set_er(mask, MIROUT(d->hwirq - HW_IRQ_MX_BASE));
50091212 MZ	137	irq_data_update_effective_affinity(d, cpumask_of(cpu));
50091212 MZ	138
26a8e96a MF	139	return 0;
	140
	141	}
	142
	143	static struct irq_chip xtensa_mx_irq_chip = {
	144	.name = "xtensa-mx",
	145	.irq_enable = xtensa_mx_irq_enable,
	146	.irq_disable = xtensa_mx_irq_disable,
	147	.irq_mask = xtensa_mx_irq_mask,
	148	.irq_unmask = xtensa_mx_irq_unmask,
	149	.irq_ack = xtensa_mx_irq_ack,
	150	.irq_retrigger = xtensa_mx_irq_retrigger,
	151	.irq_set_affinity = xtensa_mx_irq_set_affinity,
	152	};
	153
	154	int __init xtensa_mx_init_legacy(struct device_node *interrupt_parent)
	155	{
	156	struct irq_domain *root_domain =
e5c86679	157	irq_domain_add_legacy(NULL, NR_IRQS - 1, 1, 0,
26a8e96a MF	158	&xtensa_mx_irq_domain_ops,
	159	&xtensa_mx_irq_chip);
	160	irq_set_default_host(root_domain);
	161	secondary_init_irq();
	162	return 0;
	163	}
	164
	165	static int __init xtensa_mx_init(struct device_node *np,
	166	struct device_node *interrupt_parent)
	167	{
	168	struct irq_domain *root_domain =
	169	irq_domain_add_linear(np, NR_IRQS, &xtensa_mx_irq_domain_ops,
	170	&xtensa_mx_irq_chip);
	171	irq_set_default_host(root_domain);
	172	secondary_init_irq();
	173	return 0;
	174	}
	175	IRQCHIP_DECLARE(xtensa_mx_irq_chip, "cdns,xtensa-mx", xtensa_mx_init);