summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-pxa/pxa_cplds_irqs.c
blob: 45c19ca96f7a650142112c9d9ec8c9deac8122d3 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Intel Reference Systems cplds
 *
 * Copyright (C) 2014 Robert Jarzmik
 *
 * Cplds motherboard driver, supporting lubbock and mainstone SoC board.
 */

#include <linux/bitops.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of_platform.h>

#define FPGA_IRQ_MASK_EN 0x0
#define FPGA_IRQ_SET_CLR 0x10

#define CPLDS_NB_IRQ	32

struct cplds {
	void __iomem *base;
	int irq;
	unsigned int irq_mask;
	struct gpio_desc *gpio0;
	struct irq_domain *irqdomain;
};

static irqreturn_t cplds_irq_handler(int in_irq, void *d)
{
	struct cplds *fpga = d;
	unsigned long pending;
	unsigned int bit;

	do {
		pending = readl(fpga->base + FPGA_IRQ_SET_CLR) & fpga->irq_mask;
		for_each_set_bit(bit, &pending, CPLDS_NB_IRQ) {
			generic_handle_irq(irq_find_mapping(fpga->irqdomain,
							    bit));
		}
	} while (pending);

	return IRQ_HANDLED;
}

static void cplds_irq_mask(struct irq_data *d)
{
	struct cplds *fpga = irq_data_get_irq_chip_data(d);
	unsigned int cplds_irq = irqd_to_hwirq(d);
	unsigned int bit = BIT(cplds_irq);

	fpga->irq_mask &= ~bit;
	writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
}

static void cplds_irq_unmask(struct irq_data *d)
{
	struct cplds *fpga = irq_data_get_irq_chip_data(d);
	unsigned int cplds_irq = irqd_to_hwirq(d);
	unsigned int set, bit = BIT(cplds_irq);

	set = readl(fpga->base + FPGA_IRQ_SET_CLR);
	writel(set & ~bit, fpga->base + FPGA_IRQ_SET_CLR);

	fpga->irq_mask |= bit;
	writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
}

static struct irq_chip cplds_irq_chip = {
	.name		= "pxa_cplds",
	.irq_ack	= cplds_irq_mask,
	.irq_mask	= cplds_irq_mask,
	.irq_unmask	= cplds_irq_unmask,
	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE,
};

static int cplds_irq_domain_map(struct irq_domain *d, unsigned int irq,
				   irq_hw_number_t hwirq)
{
	struct cplds *fpga = d->host_data;

	irq_set_chip_and_handler(irq, &cplds_irq_chip, handle_level_irq);
	irq_set_chip_data(irq, fpga);

	return 0;
}

static const struct irq_domain_ops cplds_irq_domain_ops = {
	.xlate = irq_domain_xlate_twocell,
	.map = cplds_irq_domain_map,
};

static int cplds_resume(struct platform_device *pdev)
{
	struct cplds *fpga = platform_get_drvdata(pdev);

	writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);

	return 0;
}

static int cplds_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct cplds *fpga;
	int ret;
	int base_irq;
	unsigned long irqflags = 0;

	fpga = devm_kzalloc(&pdev->dev, sizeof(*fpga), GFP_KERNEL);
	if (!fpga)
		return -ENOMEM;

	fpga->irq = platform_get_irq(pdev, 0);
	if (fpga->irq <= 0)
		return fpga->irq;

	base_irq = platform_get_irq(pdev, 1);
	if (base_irq < 0)
		base_irq = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	fpga->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(fpga->base))
		return PTR_ERR(fpga->base);

	platform_set_drvdata(pdev, fpga);

	writel(fpga->irq_mask, fpga->base + FPGA_IRQ_MASK_EN);
	writel(0, fpga->base + FPGA_IRQ_SET_CLR);

	irqflags = irq_get_trigger_type(fpga->irq);
	ret = devm_request_irq(&pdev->dev, fpga->irq, cplds_irq_handler,
			       irqflags, dev_name(&pdev->dev), fpga);
	if (ret == -ENOSYS)
		return -EPROBE_DEFER;

	if (ret) {
		dev_err(&pdev->dev, "couldn't request main irq%d: %d\n",
			fpga->irq, ret);
		return ret;
	}

	irq_set_irq_wake(fpga->irq, 1);
	fpga->irqdomain = irq_domain_add_linear(pdev->dev.of_node,
					       CPLDS_NB_IRQ,
					       &cplds_irq_domain_ops, fpga);
	if (!fpga->irqdomain)
		return -ENODEV;

	if (base_irq) {
		ret = irq_create_strict_mappings(fpga->irqdomain, base_irq, 0,
						 CPLDS_NB_IRQ);
		if (ret) {
			dev_err(&pdev->dev, "couldn't create the irq mapping %d..%d\n",
				base_irq, base_irq + CPLDS_NB_IRQ);
			return ret;
		}
	}

	return 0;
}

static int cplds_remove(struct platform_device *pdev)
{
	struct cplds *fpga = platform_get_drvdata(pdev);

	irq_set_chip_and_handler(fpga->irq, NULL, NULL);

	return 0;
}

static const struct of_device_id cplds_id_table[] = {
	{ .compatible = "intel,lubbock-cplds-irqs", },
	{ .compatible = "intel,mainstone-cplds-irqs", },
	{ }
};
MODULE_DEVICE_TABLE(of, cplds_id_table);

static struct platform_driver cplds_driver = {
	.driver		= {
		.name	= "pxa_cplds_irqs",
		.of_match_table = of_match_ptr(cplds_id_table),
	},
	.probe		= cplds_probe,
	.remove		= cplds_remove,
	.resume		= cplds_resume,
};

module_platform_driver(cplds_driver);

MODULE_DESCRIPTION("PXA Cplds interrupts driver");
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_LICENSE("GPL");