KVM: MIPS: Drop other CPU ASIDs on guest MMU changes
[deliverable/linux.git] / drivers / irqchip / irq-gic-pm.c
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1/*
2 * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16#include <linux/module.h>
17#include <linux/clk.h>
18#include <linux/of_device.h>
19#include <linux/of_irq.h>
20#include <linux/irqchip/arm-gic.h>
21#include <linux/platform_device.h>
22#include <linux/pm_clock.h>
23#include <linux/pm_runtime.h>
24#include <linux/slab.h>
25
26struct gic_clk_data {
27 unsigned int num_clocks;
28 const char *const *clocks;
29};
30
31static int gic_runtime_resume(struct device *dev)
32{
33 struct gic_chip_data *gic = dev_get_drvdata(dev);
34 int ret;
35
36 ret = pm_clk_resume(dev);
37 if (ret)
38 return ret;
39
40 /*
41 * On the very first resume, the pointer to the driver data
42 * will be NULL and this is intentional, because we do not
43 * want to restore the GIC on the very first resume. So if
44 * the pointer is not valid just return.
45 */
46 if (!gic)
47 return 0;
48
49 gic_dist_restore(gic);
50 gic_cpu_restore(gic);
51
52 return 0;
53}
54
55static int gic_runtime_suspend(struct device *dev)
56{
57 struct gic_chip_data *gic = dev_get_drvdata(dev);
58
59 gic_dist_save(gic);
60 gic_cpu_save(gic);
61
62 return pm_clk_suspend(dev);
63}
64
65static int gic_get_clocks(struct device *dev, const struct gic_clk_data *data)
66{
67 struct clk *clk;
68 unsigned int i;
69 int ret;
70
71 if (!dev || !data)
72 return -EINVAL;
73
74 ret = pm_clk_create(dev);
75 if (ret)
76 return ret;
77
78 for (i = 0; i < data->num_clocks; i++) {
79 clk = of_clk_get_by_name(dev->of_node, data->clocks[i]);
80 if (IS_ERR(clk)) {
81 dev_err(dev, "failed to get clock %s\n",
82 data->clocks[i]);
83 ret = PTR_ERR(clk);
84 goto error;
85 }
86
87 ret = pm_clk_add_clk(dev, clk);
88 if (ret) {
89 dev_err(dev, "failed to add clock at index %d\n", i);
90 clk_put(clk);
91 goto error;
92 }
93 }
94
95 return 0;
96
97error:
98 pm_clk_destroy(dev);
99
100 return ret;
101}
102
103static int gic_probe(struct platform_device *pdev)
104{
105 struct device *dev = &pdev->dev;
106 const struct gic_clk_data *data;
107 struct gic_chip_data *gic;
108 int ret, irq;
109
110 data = of_device_get_match_data(&pdev->dev);
111 if (!data) {
112 dev_err(&pdev->dev, "no device match found\n");
113 return -ENODEV;
114 }
115
116 irq = irq_of_parse_and_map(dev->of_node, 0);
117 if (!irq) {
118 dev_err(dev, "no parent interrupt found!\n");
119 return -EINVAL;
120 }
121
122 ret = gic_get_clocks(dev, data);
123 if (ret)
124 goto irq_dispose;
125
126 pm_runtime_enable(dev);
127
128 ret = pm_runtime_get_sync(dev);
129 if (ret < 0)
130 goto rpm_disable;
131
132 ret = gic_of_init_child(dev, &gic, irq);
133 if (ret)
134 goto rpm_put;
135
136 platform_set_drvdata(pdev, gic);
137
138 pm_runtime_put(dev);
139
140 dev_info(dev, "GIC IRQ controller registered\n");
141
142 return 0;
143
144rpm_put:
145 pm_runtime_put_sync(dev);
146rpm_disable:
147 pm_runtime_disable(dev);
148 pm_clk_destroy(dev);
149irq_dispose:
150 irq_dispose_mapping(irq);
151
152 return ret;
153}
154
155static const struct dev_pm_ops gic_pm_ops = {
156 SET_RUNTIME_PM_OPS(gic_runtime_suspend,
157 gic_runtime_resume, NULL)
158};
159
160static const char * const gic400_clocks[] = {
161 "clk",
162};
163
164static const struct gic_clk_data gic400_data = {
165 .num_clocks = ARRAY_SIZE(gic400_clocks),
166 .clocks = gic400_clocks,
167};
168
169static const struct of_device_id gic_match[] = {
170 { .compatible = "nvidia,tegra210-agic", .data = &gic400_data },
171 {},
172};
173MODULE_DEVICE_TABLE(of, gic_match);
174
175static struct platform_driver gic_driver = {
176 .probe = gic_probe,
177 .driver = {
178 .name = "gic",
179 .of_match_table = gic_match,
180 .pm = &gic_pm_ops,
181 }
182};
183
184builtin_platform_driver(gic_driver);
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