aboutsummaryrefslogtreecommitdiff
path: root/drivers/irqchip/irq-ls-extirq.c
blob: 4d1179fed77c7d101246a7c5e8adc18eba8ba631 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
// SPDX-License-Identifier: GPL-2.0

#define pr_fmt(fmt) "irq-ls-extirq: " fmt

#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include <dt-bindings/interrupt-controller/arm-gic.h>

#define MAXIRQ 12
#define LS1021A_SCFGREVCR 0x200

struct ls_extirq_data {
	struct regmap		*syscon;
	u32			intpcr;
	bool			bit_reverse;
	u32			nirq;
	struct irq_fwspec	map[MAXIRQ];
};

static int
ls_extirq_set_type(struct irq_data *data, unsigned int type)
{
	struct ls_extirq_data *priv = data->chip_data;
	irq_hw_number_t hwirq = data->hwirq;
	u32 value, mask;

	if (priv->bit_reverse)
		mask = 1U << (31 - hwirq);
	else
		mask = 1U << hwirq;

	switch (type) {
	case IRQ_TYPE_LEVEL_LOW:
		type = IRQ_TYPE_LEVEL_HIGH;
		value = mask;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		type = IRQ_TYPE_EDGE_RISING;
		value = mask;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
	case IRQ_TYPE_EDGE_RISING:
		value = 0;
		break;
	default:
		return -EINVAL;
	}
	regmap_update_bits(priv->syscon, priv->intpcr, mask, value);

	return irq_chip_set_type_parent(data, type);
}

static struct irq_chip ls_extirq_chip = {
	.name			= "ls-extirq",
	.irq_mask		= irq_chip_mask_parent,
	.irq_unmask		= irq_chip_unmask_parent,
	.irq_eoi		= irq_chip_eoi_parent,
	.irq_set_type		= ls_extirq_set_type,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_set_affinity	= irq_chip_set_affinity_parent,
	.flags                  = IRQCHIP_SET_TYPE_MASKED,
};

static int
ls_extirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
		       unsigned int nr_irqs, void *arg)
{
	struct ls_extirq_data *priv = domain->host_data;
	struct irq_fwspec *fwspec = arg;
	irq_hw_number_t hwirq;

	if (fwspec->param_count != 2)
		return -EINVAL;

	hwirq = fwspec->param[0];
	if (hwirq >= priv->nirq)
		return -EINVAL;

	irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &ls_extirq_chip,
				      priv);

	return irq_domain_alloc_irqs_parent(domain, virq, 1, &priv->map[hwirq]);
}

static const struct irq_domain_ops extirq_domain_ops = {
	.xlate		= irq_domain_xlate_twocell,
	.alloc		= ls_extirq_domain_alloc,
	.free		= irq_domain_free_irqs_common,
};

static int
ls_extirq_parse_map(struct ls_extirq_data *priv, struct device_node *node)
{
	const __be32 *map;
	u32 mapsize;
	int ret;

	map = of_get_property(node, "interrupt-map", &mapsize);
	if (!map)
		return -ENOENT;
	if (mapsize % sizeof(*map))
		return -EINVAL;
	mapsize /= sizeof(*map);

	while (mapsize) {
		struct device_node *ipar;
		u32 hwirq, intsize, j;

		if (mapsize < 3)
			return -EINVAL;
		hwirq = be32_to_cpup(map);
		if (hwirq >= MAXIRQ)
			return -EINVAL;
		priv->nirq = max(priv->nirq, hwirq + 1);

		ipar = of_find_node_by_phandle(be32_to_cpup(map + 2));
		map += 3;
		mapsize -= 3;
		if (!ipar)
			return -EINVAL;
		priv->map[hwirq].fwnode = &ipar->fwnode;
		ret = of_property_read_u32(ipar, "#interrupt-cells", &intsize);
		if (ret)
			return ret;

		if (intsize > mapsize)
			return -EINVAL;

		priv->map[hwirq].param_count = intsize;
		for (j = 0; j < intsize; ++j)
			priv->map[hwirq].param[j] = be32_to_cpup(map++);
		mapsize -= intsize;
	}
	return 0;
}

static int __init
ls_extirq_of_init(struct device_node *node, struct device_node *parent)
{

	struct irq_domain *domain, *parent_domain;
	struct ls_extirq_data *priv;
	int ret;

	parent_domain = irq_find_host(parent);
	if (!parent_domain) {
		pr_err("Cannot find parent domain\n");
		return -ENODEV;
	}

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

	priv->syscon = syscon_node_to_regmap(node->parent);
	if (IS_ERR(priv->syscon)) {
		ret = PTR_ERR(priv->syscon);
		pr_err("Failed to lookup parent regmap\n");
		goto out;
	}
	ret = of_property_read_u32(node, "reg", &priv->intpcr);
	if (ret) {
		pr_err("Missing INTPCR offset value\n");
		goto out;
	}

	ret = ls_extirq_parse_map(priv, node);
	if (ret)
		goto out;

	if (of_device_is_compatible(node, "fsl,ls1021a-extirq")) {
		u32 revcr;

		ret = regmap_read(priv->syscon, LS1021A_SCFGREVCR, &revcr);
		if (ret)
			goto out;
		priv->bit_reverse = (revcr != 0);
	}

	domain = irq_domain_add_hierarchy(parent_domain, 0, priv->nirq, node,
					  &extirq_domain_ops, priv);
	if (!domain)
		ret = -ENOMEM;

out:
	if (ret)
		kfree(priv);
	return ret;
}

IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", ls_extirq_of_init);