[mirror_ubuntu-zesty-kernel.git] / drivers / irqchip / irq-clps711x.c

/*
 *  CLPS711X IRQ driver
 *
 *  Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
 *
 * 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/io.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/slab.h>

#include <asm/exception.h>
#include <asm/mach/irq.h>

#define CLPS711X_INTSR1	(0x0240)
#define CLPS711X_INTMR1	(0x0280)
#define CLPS711X_BLEOI	(0x0600)
#define CLPS711X_MCEOI	(0x0640)
#define CLPS711X_TEOI	(0x0680)
#define CLPS711X_TC1EOI	(0x06c0)
#define CLPS711X_TC2EOI	(0x0700)
#define CLPS711X_RTCEOI	(0x0740)
#define CLPS711X_UMSEOI	(0x0780)
#define CLPS711X_COEOI	(0x07c0)
#define CLPS711X_INTSR2	(0x1240)
#define CLPS711X_INTMR2	(0x1280)
#define CLPS711X_SRXEOF	(0x1600)
#define CLPS711X_KBDEOI	(0x1700)
#define CLPS711X_INTSR3	(0x2240)
#define CLPS711X_INTMR3	(0x2280)

static const struct {
#define CLPS711X_FLAG_EN	(1 << 0)
#define CLPS711X_FLAG_FIQ	(1 << 1)
	unsigned int	flags;
	phys_addr_t	eoi;
} clps711x_irqs[] = {
	[1]	= { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
	[3]	= { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
	[4]	= { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
	[5]	= { CLPS711X_FLAG_EN, },
	[6]	= { CLPS711X_FLAG_EN, },
	[7]	= { CLPS711X_FLAG_EN, },
	[8]	= { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
	[9]	= { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
	[10]	= { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
	[11]	= { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
	[12]	= { CLPS711X_FLAG_EN, },
	[13]	= { CLPS711X_FLAG_EN, },
	[14]	= { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
	[15]	= { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
	[16]	= { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
	[17]	= { CLPS711X_FLAG_EN, },
	[18]	= { CLPS711X_FLAG_EN, },
	[28]	= { CLPS711X_FLAG_EN, },
	[29]	= { CLPS711X_FLAG_EN, },
	[32]	= { CLPS711X_FLAG_FIQ, },
};

static struct {
	void __iomem		*base;
	void __iomem		*intmr[3];
	void __iomem		*intsr[3];
	struct irq_domain	*domain;
	struct irq_domain_ops	ops;
} *clps711x_intc;

static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
{
	u32 irqstat;

	do {
		irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
			  readw_relaxed(clps711x_intc->intsr[0]);
		if (irqstat)
			handle_domain_irq(clps711x_intc->domain,
					  fls(irqstat) - 1, regs);

		irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
			  readw_relaxed(clps711x_intc->intsr[1]);
		if (irqstat)
			handle_domain_irq(clps711x_intc->domain,
					  fls(irqstat) - 1 + 16, regs);
	} while (irqstat);
}

static void clps711x_intc_eoi(struct irq_data *d)
{
	irq_hw_number_t hwirq = irqd_to_hwirq(d);

	writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
}

static void clps711x_intc_mask(struct irq_data *d)
{
	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
	u32 tmp;

	tmp = readl_relaxed(intmr);
	tmp &= ~(1 << (hwirq % 16));
	writel_relaxed(tmp, intmr);
}

static void clps711x_intc_unmask(struct irq_data *d)
{
	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
	u32 tmp;

	tmp = readl_relaxed(intmr);
	tmp |= 1 << (hwirq % 16);
	writel_relaxed(tmp, intmr);
}

static struct irq_chip clps711x_intc_chip = {
	.name		= "clps711x-intc",
	.irq_eoi	= clps711x_intc_eoi,
	.irq_mask	= clps711x_intc_mask,
	.irq_unmask	= clps711x_intc_unmask,
};

static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
					irq_hw_number_t hw)
{
	irq_flow_handler_t handler = handle_level_irq;
	unsigned int flags = 0;

	if (!clps711x_irqs[hw].flags)
		return 0;

	if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
		handler = handle_bad_irq;
		flags |= IRQ_NOAUTOEN;
	} else if (clps711x_irqs[hw].eoi) {
		handler = handle_fasteoi_irq;
	}

	/* Clear down pending interrupt */
	if (clps711x_irqs[hw].eoi)
		writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);

	irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
	irq_modify_status(virq, IRQ_NOPROBE, flags);

	return 0;
}

static int __init _clps711x_intc_init(struct device_node *np,
				      phys_addr_t base, resource_size_t size)
{
	int err;

	clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
	if (!clps711x_intc)
		return -ENOMEM;

	clps711x_intc->base = ioremap(base, size);
	if (!clps711x_intc->base) {
		err = -ENOMEM;
		goto out_kfree;
	}

	clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
	clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
	clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
	clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
	clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
	clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;

	/* Mask all interrupts */
	writel_relaxed(0, clps711x_intc->intmr[0]);
	writel_relaxed(0, clps711x_intc->intmr[1]);
	writel_relaxed(0, clps711x_intc->intmr[2]);

	err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
	if (err < 0)
		goto out_iounmap;

	clps711x_intc->ops.map = clps711x_intc_irq_map;
	clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
	clps711x_intc->domain =
		irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
				      0, 0, &clps711x_intc->ops, NULL);
	if (!clps711x_intc->domain) {
		err = -ENOMEM;
		goto out_irqfree;
	}

	irq_set_default_host(clps711x_intc->domain);
	set_handle_irq(clps711x_irqh);

#ifdef CONFIG_FIQ
	init_FIQ(0);
#endif

	return 0;

out_irqfree:
	irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));

out_iounmap:
	iounmap(clps711x_intc->base);

out_kfree:
	kfree(clps711x_intc);

	return err;
}

void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
{
	BUG_ON(_clps711x_intc_init(NULL, base, size));
}

#ifdef CONFIG_IRQCHIP
static int __init clps711x_intc_init_dt(struct device_node *np,
					struct device_node *parent)
{
	struct resource res;
	int err;

	err = of_address_to_resource(np, 0, &res);
	if (err)
		return err;

	return _clps711x_intc_init(np, res.start, resource_size(&res));
}
IRQCHIP_DECLARE(clps711x, "cirrus,ep7209-intc", clps711x_intc_init_dt);
#endif
Commit	Line	Data
afc98d90 AS	1	/*
	2	* CLPS711X IRQ driver
	3	*
	4	* Copyright (C) 2013 Alexander Shiyan <shc_work@mail.ru>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/io.h>
	13	#include <linux/irq.h>
41a83e06	14	#include <linux/irqchip.h>
afc98d90 AS	15	#include <linux/irqdomain.h>
	16	#include <linux/of_address.h>
	17	#include <linux/of_irq.h>
	18	#include <linux/slab.h>
	19
	20	#include <asm/exception.h>
	21	#include <asm/mach/irq.h>
	22
afc98d90 AS	23	#define CLPS711X_INTSR1 (0x0240)
	24	#define CLPS711X_INTMR1 (0x0280)
	25	#define CLPS711X_BLEOI (0x0600)
	26	#define CLPS711X_MCEOI (0x0640)
	27	#define CLPS711X_TEOI (0x0680)
	28	#define CLPS711X_TC1EOI (0x06c0)
	29	#define CLPS711X_TC2EOI (0x0700)
	30	#define CLPS711X_RTCEOI (0x0740)
	31	#define CLPS711X_UMSEOI (0x0780)
	32	#define CLPS711X_COEOI (0x07c0)
	33	#define CLPS711X_INTSR2 (0x1240)
	34	#define CLPS711X_INTMR2 (0x1280)
	35	#define CLPS711X_SRXEOF (0x1600)
	36	#define CLPS711X_KBDEOI (0x1700)
	37	#define CLPS711X_INTSR3 (0x2240)
	38	#define CLPS711X_INTMR3 (0x2280)
	39
	40	static const struct {
	41	#define CLPS711X_FLAG_EN (1 << 0)
	42	#define CLPS711X_FLAG_FIQ (1 << 1)
	43	unsigned int flags;
	44	phys_addr_t eoi;
	45	} clps711x_irqs[] = {
	46	[1] = { CLPS711X_FLAG_FIQ, CLPS711X_BLEOI, },
	47	[3] = { CLPS711X_FLAG_FIQ, CLPS711X_MCEOI, },
	48	[4] = { CLPS711X_FLAG_EN, CLPS711X_COEOI, },
	49	[5] = { CLPS711X_FLAG_EN, },
	50	[6] = { CLPS711X_FLAG_EN, },
	51	[7] = { CLPS711X_FLAG_EN, },
	52	[8] = { CLPS711X_FLAG_EN, CLPS711X_TC1EOI, },
	53	[9] = { CLPS711X_FLAG_EN, CLPS711X_TC2EOI, },
	54	[10] = { CLPS711X_FLAG_EN, CLPS711X_RTCEOI, },
	55	[11] = { CLPS711X_FLAG_EN, CLPS711X_TEOI, },
	56	[12] = { CLPS711X_FLAG_EN, },
	57	[13] = { CLPS711X_FLAG_EN, },
	58	[14] = { CLPS711X_FLAG_EN, CLPS711X_UMSEOI, },
	59	[15] = { CLPS711X_FLAG_EN, CLPS711X_SRXEOF, },
	60	[16] = { CLPS711X_FLAG_EN, CLPS711X_KBDEOI, },
	61	[17] = { CLPS711X_FLAG_EN, },
	62	[18] = { CLPS711X_FLAG_EN, },
	63	[28] = { CLPS711X_FLAG_EN, },
	64	[29] = { CLPS711X_FLAG_EN, },
	65	[32] = { CLPS711X_FLAG_FIQ, },
	66	};
	67
	68	static struct {
	69	void __iomem *base;
	70	void __iomem *intmr[3];
	71	void __iomem *intsr[3];
	72	struct irq_domain *domain;
	73	struct irq_domain_ops ops;
	74	} *clps711x_intc;
	75
	76	static asmlinkage void __exception_irq_entry clps711x_irqh(struct pt_regs *regs)
	77	{
a8e10cb7	78	u32 irqstat;
afc98d90 AS	79
	80	do {
	81	irqstat = readw_relaxed(clps711x_intc->intmr[0]) &
	82	readw_relaxed(clps711x_intc->intsr[0]);
a8e10cb7 MZ	83	if (irqstat)
	84	handle_domain_irq(clps711x_intc->domain,
	85	fls(irqstat) - 1, regs);
afc98d90 AS	86
	87	irqstat = readw_relaxed(clps711x_intc->intmr[1]) &
	88	readw_relaxed(clps711x_intc->intsr[1]);
a8e10cb7 MZ	89	if (irqstat)
	90	handle_domain_irq(clps711x_intc->domain,
	91	fls(irqstat) - 1 + 16, regs);
afc98d90 AS	92	} while (irqstat);
	93	}
	94
	95	static void clps711x_intc_eoi(struct irq_data *d)
	96	{
	97	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	98
	99	writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hwirq].eoi);
	100	}
	101
	102	static void clps711x_intc_mask(struct irq_data *d)
	103	{
	104	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	105	void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
	106	u32 tmp;
	107
	108	tmp = readl_relaxed(intmr);
	109	tmp &= ~(1 << (hwirq % 16));
	110	writel_relaxed(tmp, intmr);
	111	}
	112
	113	static void clps711x_intc_unmask(struct irq_data *d)
	114	{
	115	irq_hw_number_t hwirq = irqd_to_hwirq(d);
	116	void __iomem *intmr = clps711x_intc->intmr[hwirq / 16];
	117	u32 tmp;
	118
	119	tmp = readl_relaxed(intmr);
	120	tmp \|= 1 << (hwirq % 16);
	121	writel_relaxed(tmp, intmr);
	122	}
	123
	124	static struct irq_chip clps711x_intc_chip = {
	125	.name = "clps711x-intc",
	126	.irq_eoi = clps711x_intc_eoi,
	127	.irq_mask = clps711x_intc_mask,
	128	.irq_unmask = clps711x_intc_unmask,
	129	};
	130
	131	static int __init clps711x_intc_irq_map(struct irq_domain *h, unsigned int virq,
	132	irq_hw_number_t hw)
	133	{
	134	irq_flow_handler_t handler = handle_level_irq;
d17cab44	135	unsigned int flags = 0;
afc98d90 AS	136
	137	if (!clps711x_irqs[hw].flags)
	138	return 0;
	139
	140	if (clps711x_irqs[hw].flags & CLPS711X_FLAG_FIQ) {
	141	handler = handle_bad_irq;
d17cab44	142	flags \|= IRQ_NOAUTOEN;
afc98d90 AS	143	} else if (clps711x_irqs[hw].eoi) {
	144	handler = handle_fasteoi_irq;
	145	}
	146
	147	/* Clear down pending interrupt */
	148	if (clps711x_irqs[hw].eoi)
	149	writel_relaxed(0, clps711x_intc->base + clps711x_irqs[hw].eoi);
	150
	151	irq_set_chip_and_handler(virq, &clps711x_intc_chip, handler);
d17cab44	152	irq_modify_status(virq, IRQ_NOPROBE, flags);
afc98d90 AS	153
	154	return 0;
	155	}
	156
	157	static int __init _clps711x_intc_init(struct device_node *np,
	158	phys_addr_t base, resource_size_t size)
	159	{
	160	int err;
	161
	162	clps711x_intc = kzalloc(sizeof(*clps711x_intc), GFP_KERNEL);
	163	if (!clps711x_intc)
	164	return -ENOMEM;
	165
	166	clps711x_intc->base = ioremap(base, size);
	167	if (!clps711x_intc->base) {
	168	err = -ENOMEM;
	169	goto out_kfree;
	170	}
	171
	172	clps711x_intc->intsr[0] = clps711x_intc->base + CLPS711X_INTSR1;
	173	clps711x_intc->intmr[0] = clps711x_intc->base + CLPS711X_INTMR1;
	174	clps711x_intc->intsr[1] = clps711x_intc->base + CLPS711X_INTSR2;
	175	clps711x_intc->intmr[1] = clps711x_intc->base + CLPS711X_INTMR2;
	176	clps711x_intc->intsr[2] = clps711x_intc->base + CLPS711X_INTSR3;
	177	clps711x_intc->intmr[2] = clps711x_intc->base + CLPS711X_INTMR3;
	178
	179	/* Mask all interrupts */
	180	writel_relaxed(0, clps711x_intc->intmr[0]);
	181	writel_relaxed(0, clps711x_intc->intmr[1]);
	182	writel_relaxed(0, clps711x_intc->intmr[2]);
	183
	184	err = irq_alloc_descs(-1, 0, ARRAY_SIZE(clps711x_irqs), numa_node_id());
287980e4	185	if (err < 0)
afc98d90 AS	186	goto out_iounmap;
	187
	188	clps711x_intc->ops.map = clps711x_intc_irq_map;
	189	clps711x_intc->ops.xlate = irq_domain_xlate_onecell;
	190	clps711x_intc->domain =
	191	irq_domain_add_legacy(np, ARRAY_SIZE(clps711x_irqs),
	192	0, 0, &clps711x_intc->ops, NULL);
	193	if (!clps711x_intc->domain) {
	194	err = -ENOMEM;
	195	goto out_irqfree;
	196	}
	197
	198	irq_set_default_host(clps711x_intc->domain);
	199	set_handle_irq(clps711x_irqh);
	200
	201	#ifdef CONFIG_FIQ
	202	init_FIQ(0);
	203	#endif
	204
	205	return 0;
	206
	207	out_irqfree:
	208	irq_free_descs(0, ARRAY_SIZE(clps711x_irqs));
	209
	210	out_iounmap:
	211	iounmap(clps711x_intc->base);
	212
	213	out_kfree:
	214	kfree(clps711x_intc);
	215
	216	return err;
	217	}
	218
	219	void __init clps711x_intc_init(phys_addr_t base, resource_size_t size)
	220	{
	221	BUG_ON(_clps711x_intc_init(NULL, base, size));
	222	}
	223
	224	#ifdef CONFIG_IRQCHIP
	225	static int __init clps711x_intc_init_dt(struct device_node *np,
	226	struct device_node *parent)
	227	{
	228	struct resource res;
	229	int err;
	230
	231	err = of_address_to_resource(np, 0, &res);
	232	if (err)
	233	return err;
	234
	235	return _clps711x_intc_init(np, res.start, resource_size(&res));
	236	}
4b4d9949	237	IRQCHIP_DECLARE(clps711x, "cirrus,ep7209-intc", clps711x_intc_init_dt);
afc98d90	238	#endif