[deliverable/linux.git] / arch / arm / mach-vt8500 / irq.c

/*
 *  arch/arm/mach-vt8500/irq.c
 *
 *  Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
 *  Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * This file is copied and modified from the original irq.c provided by
 * Alexey Charkov. Minor changes have been made for Device Tree Support.
 */

#include <linux/slab.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>

#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>

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

#define VT8500_ICPC_IRQ		0x20
#define VT8500_ICPC_FIQ		0x24
#define VT8500_ICDC		0x40		/* Destination Control 64*u32 */
#define VT8500_ICIS		0x80		/* Interrupt status, 16*u32 */

/* ICPC */
#define ICPC_MASK		0x3F
#define ICPC_ROTATE		BIT(6)

/* IC_DCTR */
#define ICDC_IRQ		0x00
#define ICDC_FIQ		0x01
#define ICDC_DSS0		0x02
#define ICDC_DSS1		0x03
#define ICDC_DSS2		0x04
#define ICDC_DSS3		0x05
#define ICDC_DSS4		0x06
#define ICDC_DSS5		0x07

#define VT8500_INT_DISABLE	0
#define VT8500_INT_ENABLE	BIT(3)

#define VT8500_TRIGGER_HIGH	0
#define VT8500_TRIGGER_RISING	BIT(5)
#define VT8500_TRIGGER_FALLING	BIT(6)
#define VT8500_EDGE		( VT8500_TRIGGER_RISING \
				| VT8500_TRIGGER_FALLING)

/* vt8500 has 1 intc, wm8505 and wm8650 have 2 */
#define VT8500_INTC_MAX		2

struct vt8500_irq_data {
	void __iomem 		*base;		/* IO Memory base address */
	struct irq_domain	*domain;	/* Domain for this controller */
};

/* Global variable for accessing io-mem addresses */
static struct vt8500_irq_data intc[VT8500_INTC_MAX];
static u32 active_cnt = 0;

static void vt8500_irq_mask(struct irq_data *d)
{
	struct vt8500_irq_data *priv = d->domain->host_data;
	void __iomem *base = priv->base;
	void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
	u8 edge, dctr;
	u32 status;

	edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
	if (edge) {
		status = readl(stat_reg);

		status |= (1 << (d->hwirq & 0x1f));
		writel(status, stat_reg);
	} else {
		dctr = readb(base + VT8500_ICDC + d->hwirq);
		dctr &= ~VT8500_INT_ENABLE;
		writeb(dctr, base + VT8500_ICDC + d->hwirq);
	}
}

static void vt8500_irq_unmask(struct irq_data *d)
{
	struct vt8500_irq_data *priv = d->domain->host_data;
	void __iomem *base = priv->base;
	u8 dctr;

	dctr = readb(base + VT8500_ICDC + d->hwirq);
	dctr |= VT8500_INT_ENABLE;
	writeb(dctr, base + VT8500_ICDC + d->hwirq);
}

static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
	struct vt8500_irq_data *priv = d->domain->host_data;
	void __iomem *base = priv->base;
	u8 dctr;

	dctr = readb(base + VT8500_ICDC + d->hwirq);
	dctr &= ~VT8500_EDGE;

	switch (flow_type) {
	case IRQF_TRIGGER_LOW:
		return -EINVAL;
	case IRQF_TRIGGER_HIGH:
		dctr |= VT8500_TRIGGER_HIGH;
		__irq_set_handler_locked(d->irq, handle_level_irq);
		break;
	case IRQF_TRIGGER_FALLING:
		dctr |= VT8500_TRIGGER_FALLING;
		__irq_set_handler_locked(d->irq, handle_edge_irq);
		break;
	case IRQF_TRIGGER_RISING:
		dctr |= VT8500_TRIGGER_RISING;
		__irq_set_handler_locked(d->irq, handle_edge_irq);
		break;
	}
	writeb(dctr, base + VT8500_ICDC + d->hwirq);

	return 0;
}

static struct irq_chip vt8500_irq_chip = {
	.name = "vt8500",
	.irq_ack = vt8500_irq_mask,
	.irq_mask = vt8500_irq_mask,
	.irq_unmask = vt8500_irq_unmask,
	.irq_set_type = vt8500_irq_set_type,
};

static void __init vt8500_init_irq_hw(void __iomem *base)
{
	u32 i;

	/* Enable rotating priority for IRQ */
	writel(ICPC_ROTATE, base + VT8500_ICPC_IRQ);
	writel(0x00, base + VT8500_ICPC_FIQ);

	/* Disable all interrupts and route them to IRQ */
	for (i = 0; i < 64; i++)
		writeb(VT8500_INT_DISABLE | ICDC_IRQ, base + VT8500_ICDC + i);
}

static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
							irq_hw_number_t hw)
{
	irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
	set_irq_flags(virq, IRQF_VALID);

	return 0;
}

static struct irq_domain_ops vt8500_irq_domain_ops = {
	.map = vt8500_irq_map,
	.xlate = irq_domain_xlate_onecell,
};

asmlinkage void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
{
	u32 stat, i;
	int irqnr, virq;
	void __iomem *base;

	/* Loop through each active controller */
	for (i=0; i<active_cnt; i++) {
		base = intc[i].base;
		irqnr = readl_relaxed(base) & 0x3F;
		/*
		  Highest Priority register default = 63, so check that this
		  is a real interrupt by checking the status register
		*/
		if (irqnr == 63) {
			stat = readl_relaxed(base + VT8500_ICIS + 4);
			if (!(stat & BIT(31)))
				continue;
		}

		virq = irq_find_mapping(intc[i].domain, irqnr);
		handle_IRQ(virq, regs);
	}
}

int __init vt8500_irq_init(struct device_node *node, struct device_node *parent)
{
	int irq, i;
	struct device_node *np = node;

	if (active_cnt == VT8500_INTC_MAX) {
		pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
								__func__);
		goto out;
	}

	intc[active_cnt].base = of_iomap(np, 0);
	intc[active_cnt].domain = irq_domain_add_linear(node, 64,
			&vt8500_irq_domain_ops,	&intc[active_cnt]);

	if (!intc[active_cnt].base) {
		pr_err("%s: Unable to map IO memory\n", __func__);
		goto out;
	}

	if (!intc[active_cnt].domain) {
		pr_err("%s: Unable to add irq domain!\n", __func__);
		goto out;
	}

	vt8500_init_irq_hw(intc[active_cnt].base);

	pr_info("vt8500-irq: Added interrupt controller\n");

	active_cnt++;

	/* check if this is a slaved controller */
	if (of_irq_count(np) != 0) {
		/* check that we have the correct number of interrupts */
		if (of_irq_count(np) != 8) {
			pr_err("%s: Incorrect IRQ map for slaved controller\n",
					__func__);
			return -EINVAL;
		}

		for (i = 0; i < 8; i++) {
			irq = irq_of_parse_and_map(np, i);
			enable_irq(irq);
		}

		pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
	}
out:
	return 0;
}
Commit	Line	Data
21f47fbc AC	1	/*
	2	* arch/arm/mach-vt8500/irq.c
	3	*
e9a91de7	4	* Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
21f47fbc AC	5	* Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
e9a91de7 TP	22	/*
	23	* This file is copied and modified from the original irq.c provided by
	24	* Alexey Charkov. Minor changes have been made for Device Tree Support.
	25	*/
	26
	27	#include <linux/slab.h>
21f47fbc AC	28	#include <linux/io.h>
21f47fbc AC	29	#include <linux/irq.h>
e9a91de7	30	#include <linux/irqdomain.h>
21f47fbc	31	#include <linux/interrupt.h>
e9a91de7 TP	32	#include <linux/bitops.h>
	33
	34	#include <linux/of.h>
	35	#include <linux/of_irq.h>
	36	#include <linux/of_address.h>
21f47fbc AC	37
21f47fbc AC	38	#include <asm/irq.h>
0c464d58	39	#include <asm/exception.h>
21f47fbc	40
e9a91de7 TP	41	#define VT8500_ICPC_IRQ 0x20
	42	#define VT8500_ICPC_FIQ 0x24
	43	#define VT8500_ICDC 0x40 /* Destination Control 64u32 /
	44	#define VT8500_ICIS 0x80 /* Interrupt status, 16u32 /
	45
	46	/* ICPC */
	47	#define ICPC_MASK 0x3F
	48	#define ICPC_ROTATE BIT(6)
	49
	50	/* IC_DCTR */
	51	#define ICDC_IRQ 0x00
	52	#define ICDC_FIQ 0x01
	53	#define ICDC_DSS0 0x02
	54	#define ICDC_DSS1 0x03
	55	#define ICDC_DSS2 0x04
	56	#define ICDC_DSS3 0x05
	57	#define ICDC_DSS4 0x06
	58	#define ICDC_DSS5 0x07
	59
	60	#define VT8500_INT_DISABLE 0
	61	#define VT8500_INT_ENABLE BIT(3)
	62
	63	#define VT8500_TRIGGER_HIGH 0
	64	#define VT8500_TRIGGER_RISING BIT(5)
	65	#define VT8500_TRIGGER_FALLING BIT(6)
21f47fbc AC	66	#define VT8500_EDGE ( VT8500_TRIGGER_RISING \
21f47fbc AC	67	\| VT8500_TRIGGER_FALLING)
21f47fbc	68
0c464d58 TP	69	/* vt8500 has 1 intc, wm8505 and wm8650 have 2 */
0c464d58 TP	70	#define VT8500_INTC_MAX 2
e9a91de7	71
0c464d58 TP	72	struct vt8500_irq_data {
	73	void __iomem base; / IO Memory base address */
	74	struct irq_domain domain; / Domain for this controller */
e9a91de7	75	};
21f47fbc	76
0c464d58 TP	77	/* Global variable for accessing io-mem addresses */
	78	static struct vt8500_irq_data intc[VT8500_INTC_MAX];
	79	static u32 active_cnt = 0;
	80
2eb5af44	81	static void vt8500_irq_mask(struct irq_data *d)
21f47fbc	82	{
0c464d58	83	struct vt8500_irq_data *priv = d->domain->host_data;
e9a91de7	84	void __iomem *base = priv->base;
0c464d58 TP	85	void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
	86	u8 edge, dctr;
	87	u32 status;
21f47fbc	88
e9a91de7	89	edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
21f47fbc	90	if (edge) {
0c464d58	91	status = readl(stat_reg);
21f47fbc	92
e9a91de7	93	status \|= (1 << (d->hwirq & 0x1f));
21f47fbc AC	94	writel(status, stat_reg);
21f47fbc AC	95	} else {
0c464d58	96	dctr = readb(base + VT8500_ICDC + d->hwirq);
21f47fbc	97	dctr &= ~VT8500_INT_ENABLE;
e9a91de7	98	writeb(dctr, base + VT8500_ICDC + d->hwirq);
21f47fbc AC	99	}
	100	}
	101
2eb5af44	102	static void vt8500_irq_unmask(struct irq_data *d)
21f47fbc	103	{
0c464d58	104	struct vt8500_irq_data *priv = d->domain->host_data;
e9a91de7	105	void __iomem *base = priv->base;
21f47fbc AC	106	u8 dctr;
21f47fbc AC	107
e9a91de7	108	dctr = readb(base + VT8500_ICDC + d->hwirq);
21f47fbc	109	dctr \|= VT8500_INT_ENABLE;
e9a91de7	110	writeb(dctr, base + VT8500_ICDC + d->hwirq);
21f47fbc AC	111	}
21f47fbc AC	112
2eb5af44	113	static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
21f47fbc	114	{
0c464d58	115	struct vt8500_irq_data *priv = d->domain->host_data;
e9a91de7	116	void __iomem *base = priv->base;
21f47fbc AC	117	u8 dctr;
21f47fbc AC	118
e9a91de7	119	dctr = readb(base + VT8500_ICDC + d->hwirq);
21f47fbc AC	120	dctr &= ~VT8500_EDGE;
	121
	122	switch (flow_type) {
	123	case IRQF_TRIGGER_LOW:
	124	return -EINVAL;
	125	case IRQF_TRIGGER_HIGH:
	126	dctr \|= VT8500_TRIGGER_HIGH;
e9a91de7	127	__irq_set_handler_locked(d->irq, handle_level_irq);
21f47fbc AC	128	break;
	129	case IRQF_TRIGGER_FALLING:
	130	dctr \|= VT8500_TRIGGER_FALLING;
e9a91de7	131	__irq_set_handler_locked(d->irq, handle_edge_irq);
21f47fbc AC	132	break;
	133	case IRQF_TRIGGER_RISING:
	134	dctr \|= VT8500_TRIGGER_RISING;
e9a91de7	135	__irq_set_handler_locked(d->irq, handle_edge_irq);
21f47fbc AC	136	break;
21f47fbc AC	137	}
e9a91de7	138	writeb(dctr, base + VT8500_ICDC + d->hwirq);
21f47fbc AC	139
	140	return 0;
	141	}
	142
	143	static struct irq_chip vt8500_irq_chip = {
2eb5af44 WS	144	.name = "vt8500",
	145	.irq_ack = vt8500_irq_mask,
	146	.irq_mask = vt8500_irq_mask,
	147	.irq_unmask = vt8500_irq_unmask,
	148	.irq_set_type = vt8500_irq_set_type,
21f47fbc AC	149	};
21f47fbc AC	150
e9a91de7	151	static void __init vt8500_init_irq_hw(void __iomem *base)
21f47fbc	152	{
0c464d58	153	u32 i;
21f47fbc	154
e9a91de7 TP	155	/* Enable rotating priority for IRQ */
	156	writel(ICPC_ROTATE, base + VT8500_ICPC_IRQ);
	157	writel(0x00, base + VT8500_ICPC_FIQ);
21f47fbc	158
0c464d58 TP	159	/* Disable all interrupts and route them to IRQ */
	160	for (i = 0; i < 64; i++)
	161	writeb(VT8500_INT_DISABLE \| ICDC_IRQ, base + VT8500_ICDC + i);
e9a91de7	162	}
21f47fbc	163
e9a91de7 TP	164	static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
	165	irq_hw_number_t hw)
	166	{
	167	irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
	168	set_irq_flags(virq, IRQF_VALID);
21f47fbc	169
e9a91de7	170	return 0;
21f47fbc AC	171	}
21f47fbc AC	172
e9a91de7 TP	173	static struct irq_domain_ops vt8500_irq_domain_ops = {
	174	.map = vt8500_irq_map,
	175	.xlate = irq_domain_xlate_onecell,
	176	};
	177
0c464d58 TP	178	asmlinkage void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
	179	{
	180	u32 stat, i;
	181	int irqnr, virq;
	182	void __iomem *base;
	183
	184	/* Loop through each active controller */
	185	for (i=0; i<active_cnt; i++) {
	186	base = intc[i].base;
	187	irqnr = readl_relaxed(base) & 0x3F;
	188	/*
	189	Highest Priority register default = 63, so check that this
	190	is a real interrupt by checking the status register
	191	*/
	192	if (irqnr == 63) {
	193	stat = readl_relaxed(base + VT8500_ICIS + 4);
	194	if (!(stat & BIT(31)))
	195	continue;
	196	}
	197
	198	virq = irq_find_mapping(intc[i].domain, irqnr);
	199	handle_IRQ(virq, regs);
	200	}
	201	}
	202
e9a91de7	203	int __init vt8500_irq_init(struct device_node node, struct device_node parent)
21f47fbc	204	{
e9a91de7 TP	205	int irq, i;
	206	struct device_node *np = node;
	207
0c464d58 TP	208	if (active_cnt == VT8500_INTC_MAX) {
	209	pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
	210	__func__);
	211	goto out;
	212	}
	213
	214	intc[active_cnt].base = of_iomap(np, 0);
	215	intc[active_cnt].domain = irq_domain_add_linear(node, 64,
	216	&vt8500_irq_domain_ops, &intc[active_cnt]);
e9a91de7	217
0c464d58 TP	218	if (!intc[active_cnt].base) {
	219	pr_err("%s: Unable to map IO memory\n", __func__);
	220	goto out;
	221	}
	222
	223	if (!intc[active_cnt].domain) {
	224	pr_err("%s: Unable to add irq domain!\n", __func__);
	225	goto out;
	226	}
e9a91de7	227
0c464d58	228	vt8500_init_irq_hw(intc[active_cnt].base);
e9a91de7	229
0c464d58	230	pr_info("vt8500-irq: Added interrupt controller\n");
21f47fbc	231
0c464d58	232	active_cnt++;
e9a91de7 TP	233
	234	/* check if this is a slaved controller */
	235	if (of_irq_count(np) != 0) {
	236	/* check that we have the correct number of interrupts */
	237	if (of_irq_count(np) != 8) {
0c464d58	238	pr_err("%s: Incorrect IRQ map for slaved controller\n",
e9a91de7 TP	239	__func__);
e9a91de7 TP	240	return -EINVAL;
21f47fbc	241	}
e9a91de7 TP	242
	243	for (i = 0; i < 8; i++) {
	244	irq = irq_of_parse_and_map(np, i);
	245	enable_irq(irq);
	246	}
	247
	248	pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
21f47fbc	249	}
0c464d58	250	out:
e9a91de7	251	return 0;
21f47fbc	252	}
e9a91de7	253