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
26 struct gic_clk_data {
27 unsigned int num_clocks;
28 const char *const *clocks;
29 };
30
gic_runtime_resume(struct device * dev)31 static 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
gic_runtime_suspend(struct device * dev)55 static 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
gic_get_clocks(struct device * dev,const struct gic_clk_data * data)65 static int gic_get_clocks(struct device *dev, const struct gic_clk_data *data)
66 {
67 unsigned int i;
68 int ret;
69
70 if (!dev || !data)
71 return -EINVAL;
72
73 ret = pm_clk_create(dev);
74 if (ret)
75 return ret;
76
77 for (i = 0; i < data->num_clocks; i++) {
78 ret = of_pm_clk_add_clk(dev, data->clocks[i]);
79 if (ret) {
80 dev_err(dev, "failed to add clock %s\n",
81 data->clocks[i]);
82 pm_clk_destroy(dev);
83 return ret;
84 }
85 }
86
87 return 0;
88 }
89
gic_probe(struct platform_device * pdev)90 static int gic_probe(struct platform_device *pdev)
91 {
92 struct device *dev = &pdev->dev;
93 const struct gic_clk_data *data;
94 struct gic_chip_data *gic;
95 int ret, irq;
96
97 data = of_device_get_match_data(&pdev->dev);
98 if (!data) {
99 dev_err(&pdev->dev, "no device match found\n");
100 return -ENODEV;
101 }
102
103 irq = irq_of_parse_and_map(dev->of_node, 0);
104 if (!irq) {
105 dev_err(dev, "no parent interrupt found!\n");
106 return -EINVAL;
107 }
108
109 ret = gic_get_clocks(dev, data);
110 if (ret)
111 goto irq_dispose;
112
113 pm_runtime_enable(dev);
114
115 ret = pm_runtime_get_sync(dev);
116 if (ret < 0)
117 goto rpm_disable;
118
119 ret = gic_of_init_child(dev, &gic, irq);
120 if (ret)
121 goto rpm_put;
122
123 platform_set_drvdata(pdev, gic);
124
125 pm_runtime_put(dev);
126
127 dev_info(dev, "GIC IRQ controller registered\n");
128
129 return 0;
130
131 rpm_put:
132 pm_runtime_put_sync(dev);
133 rpm_disable:
134 pm_runtime_disable(dev);
135 pm_clk_destroy(dev);
136 irq_dispose:
137 irq_dispose_mapping(irq);
138
139 return ret;
140 }
141
142 static const struct dev_pm_ops gic_pm_ops = {
143 SET_RUNTIME_PM_OPS(gic_runtime_suspend,
144 gic_runtime_resume, NULL)
145 };
146
147 static const char * const gic400_clocks[] = {
148 "clk",
149 };
150
151 static const struct gic_clk_data gic400_data = {
152 .num_clocks = ARRAY_SIZE(gic400_clocks),
153 .clocks = gic400_clocks,
154 };
155
156 static const struct of_device_id gic_match[] = {
157 { .compatible = "nvidia,tegra210-agic", .data = &gic400_data },
158 {},
159 };
160 MODULE_DEVICE_TABLE(of, gic_match);
161
162 static struct platform_driver gic_driver = {
163 .probe = gic_probe,
164 .driver = {
165 .name = "gic",
166 .of_match_table = gic_match,
167 .pm = &gic_pm_ops,
168 }
169 };
170
171 builtin_platform_driver(gic_driver);
172
