scsi: hisi_sas: Set a port invalid only if there are no devices attached when refresh...
[platform/kernel/linux-rpi.git] / drivers / irqchip / irq-gic-pm.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2016 NVIDIA CORPORATION, All Rights Reserved.
4  */
5 #include <linux/module.h>
6 #include <linux/clk.h>
7 #include <linux/of_device.h>
8 #include <linux/of_irq.h>
9 #include <linux/irqchip/arm-gic.h>
10 #include <linux/platform_device.h>
11 #include <linux/pm_runtime.h>
12 #include <linux/slab.h>
13
14 struct gic_clk_data {
15         unsigned int num_clocks;
16         const char *const *clocks;
17 };
18
19 struct gic_chip_pm {
20         struct gic_chip_data *chip_data;
21         const struct gic_clk_data *clk_data;
22         struct clk_bulk_data *clks;
23 };
24
25 static int gic_runtime_resume(struct device *dev)
26 {
27         struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
28         struct gic_chip_data *gic = chip_pm->chip_data;
29         const struct gic_clk_data *data = chip_pm->clk_data;
30         int ret;
31
32         ret = clk_bulk_prepare_enable(data->num_clocks, chip_pm->clks);
33         if (ret)
34                 return ret;
35
36         /*
37          * On the very first resume, the pointer to chip_pm->chip_data
38          * will be NULL and this is intentional, because we do not
39          * want to restore the GIC on the very first resume. So if
40          * the pointer is not valid just return.
41          */
42         if (!gic)
43                 return 0;
44
45         gic_dist_restore(gic);
46         gic_cpu_restore(gic);
47
48         return 0;
49 }
50
51 static int gic_runtime_suspend(struct device *dev)
52 {
53         struct gic_chip_pm *chip_pm = dev_get_drvdata(dev);
54         struct gic_chip_data *gic = chip_pm->chip_data;
55         const struct gic_clk_data *data = chip_pm->clk_data;
56
57         gic_dist_save(gic);
58         gic_cpu_save(gic);
59
60         clk_bulk_disable_unprepare(data->num_clocks, chip_pm->clks);
61
62         return 0;
63 }
64
65 static int gic_probe(struct platform_device *pdev)
66 {
67         struct device *dev = &pdev->dev;
68         const struct gic_clk_data *data;
69         struct gic_chip_pm *chip_pm;
70         int ret, irq, i;
71
72         data = of_device_get_match_data(&pdev->dev);
73         if (!data) {
74                 dev_err(&pdev->dev, "no device match found\n");
75                 return -ENODEV;
76         }
77
78         chip_pm = devm_kzalloc(dev, sizeof(*chip_pm), GFP_KERNEL);
79         if (!chip_pm)
80                 return -ENOMEM;
81
82         irq = irq_of_parse_and_map(dev->of_node, 0);
83         if (!irq) {
84                 dev_err(dev, "no parent interrupt found!\n");
85                 return -EINVAL;
86         }
87
88         chip_pm->clks = devm_kcalloc(dev, data->num_clocks,
89                                      sizeof(*chip_pm->clks), GFP_KERNEL);
90         if (!chip_pm->clks)
91                 return -ENOMEM;
92
93         for (i = 0; i < data->num_clocks; i++)
94                 chip_pm->clks[i].id = data->clocks[i];
95
96         ret = devm_clk_bulk_get(dev, data->num_clocks, chip_pm->clks);
97         if (ret)
98                 goto irq_dispose;
99
100         chip_pm->clk_data = data;
101         dev_set_drvdata(dev, chip_pm);
102
103         pm_runtime_enable(dev);
104
105         ret = pm_runtime_resume_and_get(dev);
106         if (ret < 0)
107                 goto rpm_disable;
108
109         ret = gic_of_init_child(dev, &chip_pm->chip_data, irq);
110         if (ret)
111                 goto rpm_put;
112
113         pm_runtime_put(dev);
114
115         dev_info(dev, "GIC IRQ controller registered\n");
116
117         return 0;
118
119 rpm_put:
120         pm_runtime_put_sync(dev);
121 rpm_disable:
122         pm_runtime_disable(dev);
123 irq_dispose:
124         irq_dispose_mapping(irq);
125
126         return ret;
127 }
128
129 static const struct dev_pm_ops gic_pm_ops = {
130         SET_RUNTIME_PM_OPS(gic_runtime_suspend,
131                            gic_runtime_resume, NULL)
132         SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
133                                      pm_runtime_force_resume)
134 };
135
136 static const char * const gic400_clocks[] = {
137         "clk",
138 };
139
140 static const struct gic_clk_data gic400_data = {
141         .num_clocks = ARRAY_SIZE(gic400_clocks),
142         .clocks = gic400_clocks,
143 };
144
145 static const struct of_device_id gic_match[] = {
146         { .compatible = "nvidia,tegra210-agic", .data = &gic400_data },
147         {},
148 };
149 MODULE_DEVICE_TABLE(of, gic_match);
150
151 static struct platform_driver gic_driver = {
152         .probe          = gic_probe,
153         .driver         = {
154                 .name   = "gic",
155                 .of_match_table = gic_match,
156                 .pm     = &gic_pm_ops,
157         }
158 };
159
160 builtin_platform_driver(gic_driver);