summaryrefslogtreecommitdiffstats
path: root/drivers/irqchip/irq-atmel-aic-common.c
blob: 656cfe336837e9e22a4b7d03629744fd0a2ad35a (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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
/*
 * Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by
 * irq-atmel-aic and irq-atmel-aic5 drivers
 *
 *  Copyright (C) 2004 SAN People
 *  Copyright (C) 2004 ATMEL
 *  Copyright (C) Rick Bronson
 *  Copyright (C) 2014 Free Electrons
 *
 *  Author: Boris BREZILLON <boris.brezillon@free-electrons.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/errno.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>

#include "irq-atmel-aic-common.h"

#define AT91_AIC_PRIOR			GENMASK(2, 0)
#define AT91_AIC_IRQ_MIN_PRIORITY	0
#define AT91_AIC_IRQ_MAX_PRIORITY	7

#define AT91_AIC_SRCTYPE		GENMASK(7, 6)
#define AT91_AIC_SRCTYPE_LOW		(0 << 5)
#define AT91_AIC_SRCTYPE_FALLING	(1 << 5)
#define AT91_AIC_SRCTYPE_HIGH		(2 << 5)
#define AT91_AIC_SRCTYPE_RISING		(3 << 5)

struct aic_chip_data {
	u32 ext_irqs;
};

static void aic_common_shutdown(struct irq_data *d)
{
	struct irq_chip_type *ct = irq_data_get_chip_type(d);

	ct->chip.irq_mask(d);
}

int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
	struct aic_chip_data *aic = gc->private;
	unsigned aic_type;

	switch (type) {
	case IRQ_TYPE_LEVEL_HIGH:
		aic_type = AT91_AIC_SRCTYPE_HIGH;
		break;
	case IRQ_TYPE_EDGE_RISING:
		aic_type = AT91_AIC_SRCTYPE_RISING;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		if (!(d->mask & aic->ext_irqs))
			return -EINVAL;

		aic_type = AT91_AIC_SRCTYPE_LOW;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		if (!(d->mask & aic->ext_irqs))
			return -EINVAL;

		aic_type = AT91_AIC_SRCTYPE_FALLING;
		break;
	default:
		return -EINVAL;
	}

	*val &= AT91_AIC_SRCTYPE;
	*val |= aic_type;

	return 0;
}

int aic_common_set_priority(int priority, unsigned *val)
{
	if (priority < AT91_AIC_IRQ_MIN_PRIORITY ||
	    priority > AT91_AIC_IRQ_MAX_PRIORITY)
		return -EINVAL;

	*val &= AT91_AIC_PRIOR;
	*val |= priority;

	return 0;
}

int aic_common_irq_domain_xlate(struct irq_domain *d,
				struct device_node *ctrlr,
				const u32 *intspec,
				unsigned int intsize,
				irq_hw_number_t *out_hwirq,
				unsigned int *out_type)
{
	if (WARN_ON(intsize < 3))
		return -EINVAL;

	if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
		    (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
		return -EINVAL;

	*out_hwirq = intspec[0];
	*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;

	return 0;
}

static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
{
	struct device_node *node = domain->of_node;
	struct irq_chip_generic *gc;
	struct aic_chip_data *aic;
	struct property *prop;
	const __be32 *p;
	u32 hwirq;

	gc = irq_get_domain_generic_chip(domain, 0);

	aic = gc->private;
	aic->ext_irqs |= 1;

	of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
		gc = irq_get_domain_generic_chip(domain, hwirq);
		if (!gc) {
			pr_warn("AIC: external irq %d >= %d skip it\n",
				hwirq, domain->revmap_size);
			continue;
		}

		aic = gc->private;
		aic->ext_irqs |= (1 << (hwirq % 32));
	}
}

#define AT91_RTC_IDR           0x24
#define AT91_RTC_IMR           0x28
#define AT91_RTC_IRQ_MASK      0x1f

void __init aic_common_rtc_irq_fixup(struct device_node *root)
{
	struct device_node *np;
	void __iomem *regs;

	np = of_find_compatible_node(root, NULL, "atmel,at91rm9200-rtc");
	if (!np)
		np = of_find_compatible_node(root, NULL,
					     "atmel,at91sam9x5-rtc");

	if (!np)
		return;

	regs = of_iomap(np, 0);
	of_node_put(np);

	if (!regs)
		return;

	writel(AT91_RTC_IRQ_MASK, regs + AT91_RTC_IDR);

	iounmap(regs);
}

#define AT91_RTT_MR		0x00			/* Real-time Mode Register */
#define AT91_RTT_ALMIEN		(1 << 16)		/* Alarm Interrupt Enable */
#define AT91_RTT_RTTINCIEN	(1 << 17)		/* Real Time Timer Increment Interrupt Enable */

void __init aic_common_rtt_irq_fixup(struct device_node *root)
{
	struct device_node *np;
	void __iomem *regs;

	/*
	 * The at91sam9263 SoC has 2 instances of the RTT block, hence we
	 * iterate over the DT to find each occurrence.
	 */
	for_each_compatible_node(np, NULL, "atmel,at91sam9260-rtt") {
		regs = of_iomap(np, 0);
		if (!regs)
			continue;

		writel(readl(regs + AT91_RTT_MR) &
		       ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN),
		       regs + AT91_RTT_MR);

		iounmap(regs);
	}
}

void __init aic_common_irq_fixup(const struct of_device_id *matches)
{
	struct device_node *root = of_find_node_by_path("/");
	const struct of_device_id *match;

	if (!root)
		return;

	match = of_match_node(matches, root);
	of_node_put(root);

	if (match) {
		void (*fixup)(struct device_node *) = match->data;
		fixup(root);
	}

	of_node_put(root);
}

struct irq_domain *__init aic_common_of_init(struct device_node *node,
					     const struct irq_domain_ops *ops,
					     const char *name, int nirqs)
{
	struct irq_chip_generic *gc;
	struct irq_domain *domain;
	struct aic_chip_data *aic;
	void __iomem *reg_base;
	int nchips;
	int ret;
	int i;

	nchips = DIV_ROUND_UP(nirqs, 32);

	reg_base = of_iomap(node, 0);
	if (!reg_base)
		return ERR_PTR(-ENOMEM);

	aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
	if (!aic) {
		ret = -ENOMEM;
		goto err_iounmap;
	}

	domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
	if (!domain) {
		ret = -ENOMEM;
		goto err_free_aic;
	}

	ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
					     handle_level_irq, 0, 0,
					     IRQCHIP_SKIP_SET_WAKE);
	if (ret)
		goto err_domain_remove;

	for (i = 0; i < nchips; i++) {
		gc = irq_get_domain_generic_chip(domain, i * 32);

		gc->reg_base = reg_base;

		gc->unused = 0;
		gc->wake_enabled = ~0;
		gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
		gc->chip_types[0].handler = handle_fasteoi_irq;
		gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
		gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
		gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
		gc->private = &aic[i];
	}

	aic_common_ext_irq_of_init(domain);

	return domain;

err_domain_remove:
	irq_domain_remove(domain);

err_free_aic:
	kfree(aic);

err_iounmap:
	iounmap(reg_base);

	return ERR_PTR(ret);
}