1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2010 Google, Inc.
4 *
5 * Author:
6 *	Colin Cross <ccross@google.com>
7 *	Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation
8 */
9
10#include <linux/bits.h>
11#include <linux/cpu.h>
12#include <linux/err.h>
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/of_device.h>
16#include <linux/platform_device.h>
17#include <linux/pm_opp.h>
18#include <linux/types.h>
19
20#include <soc/tegra/common.h>
21#include <soc/tegra/fuse.h>
22
23static bool cpu0_node_has_opp_v2_prop(void)
24{
25	struct device_node *np = of_cpu_device_node_get(0);
26	bool ret = false;
27
28	if (of_property_present(np, "operating-points-v2"))
29		ret = true;
30
31	of_node_put(np);
32	return ret;
33}
34
35static int tegra20_cpufreq_probe(struct platform_device *pdev)
36{
37	struct platform_device *cpufreq_dt;
38	struct opp_table *opp_table;
39	struct device *cpu_dev;
40	u32 versions[2];
41	int err;
42
43	if (!cpu0_node_has_opp_v2_prop()) {
44		dev_err(&pdev->dev, "operating points not found\n");
45		dev_err(&pdev->dev, "please update your device tree\n");
46		return -ENODEV;
47	}
48
49	if (of_machine_is_compatible("nvidia,tegra20")) {
50		versions[0] = BIT(tegra_sku_info.cpu_process_id);
51		versions[1] = BIT(tegra_sku_info.soc_speedo_id);
52	} else {
53		versions[0] = BIT(tegra_sku_info.cpu_process_id);
54		versions[1] = BIT(tegra_sku_info.cpu_speedo_id);
55	}
56
57	dev_info(&pdev->dev, "hardware version 0x%x 0x%x\n",
58		 versions[0], versions[1]);
59
60	cpu_dev = get_cpu_device(0);
61	if (WARN_ON(!cpu_dev))
62		return -ENODEV;
63
64	opp_table = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2);
65	err = PTR_ERR_OR_ZERO(opp_table);
66	if (err) {
67		dev_err(&pdev->dev, "failed to set supported hw: %d\n", err);
68		return err;
69	}
70
71	cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
72	err = PTR_ERR_OR_ZERO(cpufreq_dt);
73	if (err) {
74		dev_err(&pdev->dev,
75			"failed to create cpufreq-dt device: %d\n", err);
76		goto err_put_supported_hw;
77	}
78
79	platform_set_drvdata(pdev, cpufreq_dt);
80
81	return 0;
82
83err_put_supported_hw:
84	dev_pm_opp_put_supported_hw(opp_table);
85
86	return err;
87}
88
89static int tegra20_cpufreq_remove(struct platform_device *pdev)
90{
91	struct platform_device *cpufreq_dt;
92	struct opp_table *opp_table;
93
94	cpufreq_dt = platform_get_drvdata(pdev);
95	platform_device_unregister(cpufreq_dt);
96
97	opp_table = dev_pm_opp_get_opp_table(get_cpu_device(0));
98	dev_pm_opp_put_supported_hw(opp_table);
99	dev_pm_opp_put_opp_table(opp_table);
100
101	return 0;
102}
103
104static struct platform_driver tegra20_cpufreq_driver = {
105	.probe		= tegra20_cpufreq_probe,
106	.remove		= tegra20_cpufreq_remove,
107	.driver		= {
108		.name	= "tegra20-cpufreq",
109	},
110};
111module_platform_driver(tegra20_cpufreq_driver);
112
113MODULE_ALIAS("platform:tegra20-cpufreq");
114MODULE_AUTHOR("Colin Cross <ccross@android.com>");
115MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver");
116MODULE_LICENSE("GPL");
117