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Grygorii Strashko89323f82014-07-23 17:40:30 +03001/*
2 * Texas Instruments Keystone IRQ controller IP driver
3 *
4 * Copyright (C) 2014 Texas Instruments, Inc.
5 * Author: Sajesh Kumar Saran <sajesh@ti.com>
6 * Grygorii Strashko <grygorii.strashko@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/irq.h>
19#include <linux/bitops.h>
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/irqdomain.h>
Joel Porquet41a83e02015-07-07 17:11:46 -040023#include <linux/irqchip.h>
Grygorii Strashko89323f82014-07-23 17:40:30 +030024#include <linux/irqchip/chained_irq.h>
25#include <linux/of.h>
26#include <linux/of_platform.h>
27#include <linux/mfd/syscon.h>
28#include <linux/regmap.h>
Grygorii Strashko89323f82014-07-23 17:40:30 +030029
30/* The source ID bits start from 4 to 31 (total 28 bits)*/
31#define BIT_OFS 4
32#define KEYSTONE_N_IRQ (32 - BIT_OFS)
33
34struct keystone_irq_device {
35 struct device *dev;
36 struct irq_chip chip;
37 u32 mask;
Grygorii Strashko8703ec12014-08-28 20:16:29 +030038 int irq;
Grygorii Strashko89323f82014-07-23 17:40:30 +030039 struct irq_domain *irqd;
40 struct regmap *devctrl_regs;
41 u32 devctrl_offset;
42};
43
44static inline u32 keystone_irq_readl(struct keystone_irq_device *kirq)
45{
46 int ret;
47 u32 val = 0;
48
49 ret = regmap_read(kirq->devctrl_regs, kirq->devctrl_offset, &val);
50 if (ret < 0)
51 dev_dbg(kirq->dev, "irq read failed ret(%d)\n", ret);
52 return val;
53}
54
55static inline void
56keystone_irq_writel(struct keystone_irq_device *kirq, u32 value)
57{
58 int ret;
59
60 ret = regmap_write(kirq->devctrl_regs, kirq->devctrl_offset, value);
61 if (ret < 0)
62 dev_dbg(kirq->dev, "irq write failed ret(%d)\n", ret);
63}
64
65static void keystone_irq_setmask(struct irq_data *d)
66{
67 struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d);
68
69 kirq->mask |= BIT(d->hwirq);
70 dev_dbg(kirq->dev, "mask %lu [%x]\n", d->hwirq, kirq->mask);
71}
72
73static void keystone_irq_unmask(struct irq_data *d)
74{
75 struct keystone_irq_device *kirq = irq_data_get_irq_chip_data(d);
76
77 kirq->mask &= ~BIT(d->hwirq);
78 dev_dbg(kirq->dev, "unmask %lu [%x]\n", d->hwirq, kirq->mask);
79}
80
81static void keystone_irq_ack(struct irq_data *d)
82{
83 /* nothing to do here */
84}
85
Thomas Gleixnerbd0b9ac2015-09-14 10:42:37 +020086static void keystone_irq_handler(struct irq_desc *desc)
Grygorii Strashko89323f82014-07-23 17:40:30 +030087{
Thomas Gleixner283653a2015-07-16 22:38:07 +020088 unsigned int irq = irq_desc_get_irq(desc);
Grygorii Strashko89323f82014-07-23 17:40:30 +030089 struct keystone_irq_device *kirq = irq_desc_get_handler_data(desc);
90 unsigned long pending;
91 int src, virq;
92
93 dev_dbg(kirq->dev, "start irq %d\n", irq);
94
95 chained_irq_enter(irq_desc_get_chip(desc), desc);
96
97 pending = keystone_irq_readl(kirq);
98 keystone_irq_writel(kirq, pending);
99
100 dev_dbg(kirq->dev, "pending 0x%lx, mask 0x%x\n", pending, kirq->mask);
101
102 pending = (pending >> BIT_OFS) & ~kirq->mask;
103
104 dev_dbg(kirq->dev, "pending after mask 0x%lx\n", pending);
105
106 for (src = 0; src < KEYSTONE_N_IRQ; src++) {
107 if (BIT(src) & pending) {
108 virq = irq_find_mapping(kirq->irqd, src);
109 dev_dbg(kirq->dev, "dispatch bit %d, virq %d\n",
110 src, virq);
111 if (!virq)
Colin Ian King2349f202016-09-01 11:44:54 +0100112 dev_warn(kirq->dev, "spurious irq detected hwirq %d, virq %d\n",
Grygorii Strashko89323f82014-07-23 17:40:30 +0300113 src, virq);
114 generic_handle_irq(virq);
115 }
116 }
117
118 chained_irq_exit(irq_desc_get_chip(desc), desc);
119
120 dev_dbg(kirq->dev, "end irq %d\n", irq);
121}
122
123static int keystone_irq_map(struct irq_domain *h, unsigned int virq,
124 irq_hw_number_t hw)
125{
126 struct keystone_irq_device *kirq = h->host_data;
127
128 irq_set_chip_data(virq, kirq);
129 irq_set_chip_and_handler(virq, &kirq->chip, handle_level_irq);
Rob Herringd17cab42015-08-29 18:01:22 -0500130 irq_set_probe(virq);
Grygorii Strashko89323f82014-07-23 17:40:30 +0300131 return 0;
132}
133
Krzysztof Kozlowski96009732015-04-27 21:54:24 +0900134static const struct irq_domain_ops keystone_irq_ops = {
Grygorii Strashko89323f82014-07-23 17:40:30 +0300135 .map = keystone_irq_map,
136 .xlate = irq_domain_xlate_onecell,
137};
138
139static int keystone_irq_probe(struct platform_device *pdev)
140{
141 struct device *dev = &pdev->dev;
142 struct device_node *np = dev->of_node;
143 struct keystone_irq_device *kirq;
144 int ret;
145
146 if (np == NULL)
147 return -EINVAL;
148
149 kirq = devm_kzalloc(dev, sizeof(*kirq), GFP_KERNEL);
150 if (!kirq)
151 return -ENOMEM;
152
153 kirq->devctrl_regs =
154 syscon_regmap_lookup_by_phandle(np, "ti,syscon-dev");
155 if (IS_ERR(kirq->devctrl_regs))
156 return PTR_ERR(kirq->devctrl_regs);
157
158 ret = of_property_read_u32_index(np, "ti,syscon-dev", 1,
159 &kirq->devctrl_offset);
160 if (ret) {
161 dev_err(dev, "couldn't read the devctrl_offset offset!\n");
162 return ret;
163 }
164
165 kirq->irq = platform_get_irq(pdev, 0);
166 if (kirq->irq < 0) {
167 dev_err(dev, "no irq resource %d\n", kirq->irq);
168 return kirq->irq;
169 }
170
171 kirq->dev = dev;
172 kirq->mask = ~0x0;
173 kirq->chip.name = "keystone-irq";
174 kirq->chip.irq_ack = keystone_irq_ack;
175 kirq->chip.irq_mask = keystone_irq_setmask;
176 kirq->chip.irq_unmask = keystone_irq_unmask;
177
178 kirq->irqd = irq_domain_add_linear(np, KEYSTONE_N_IRQ,
179 &keystone_irq_ops, kirq);
180 if (!kirq->irqd) {
181 dev_err(dev, "IRQ domain registration failed\n");
182 return -ENODEV;
183 }
184
185 platform_set_drvdata(pdev, kirq);
186
Russell King9414b6e2015-06-16 23:06:56 +0100187 irq_set_chained_handler_and_data(kirq->irq, keystone_irq_handler, kirq);
Grygorii Strashko89323f82014-07-23 17:40:30 +0300188
189 /* clear all source bits */
190 keystone_irq_writel(kirq, ~0x0);
191
192 dev_info(dev, "irqchip registered, nr_irqs %u\n", KEYSTONE_N_IRQ);
193
194 return 0;
195}
196
197static int keystone_irq_remove(struct platform_device *pdev)
198{
199 struct keystone_irq_device *kirq = platform_get_drvdata(pdev);
200 int hwirq;
201
202 for (hwirq = 0; hwirq < KEYSTONE_N_IRQ; hwirq++)
203 irq_dispose_mapping(irq_find_mapping(kirq->irqd, hwirq));
204
205 irq_domain_remove(kirq->irqd);
206 return 0;
207}
208
209static const struct of_device_id keystone_irq_dt_ids[] = {
210 { .compatible = "ti,keystone-irq", },
211 {},
212};
213MODULE_DEVICE_TABLE(of, keystone_irq_dt_ids);
214
215static struct platform_driver keystone_irq_device_driver = {
216 .probe = keystone_irq_probe,
217 .remove = keystone_irq_remove,
218 .driver = {
219 .name = "keystone_irq",
Grygorii Strashko89323f82014-07-23 17:40:30 +0300220 .of_match_table = of_match_ptr(keystone_irq_dt_ids),
221 }
222};
223
224module_platform_driver(keystone_irq_device_driver);
225
226MODULE_AUTHOR("Texas Instruments");
227MODULE_AUTHOR("Sajesh Kumar Saran");
228MODULE_AUTHOR("Grygorii Strashko");
229MODULE_DESCRIPTION("Keystone IRQ chip");
230MODULE_LICENSE("GPL v2");