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.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 void tegra20_cpufreq_put_supported_hw(void *opp_token)
36{
37	dev_pm_opp_put_supported_hw((unsigned long) opp_token);
38}
39
40static void tegra20_cpufreq_dt_unregister(void *cpufreq_dt)
41{
42	platform_device_unregister(cpufreq_dt);
43}
44
45static int tegra20_cpufreq_probe(struct platform_device *pdev)
46{
47	struct platform_device *cpufreq_dt;
48	struct device *cpu_dev;
49	u32 versions[2];
50	int err;
51
52	if (!cpu0_node_has_opp_v2_prop()) {
53		dev_err(&pdev->dev, "operating points not found\n");
54		dev_err(&pdev->dev, "please update your device tree\n");
55		return -ENODEV;
56	}
57
58	if (of_machine_is_compatible("nvidia,tegra20")) {
59		versions[0] = BIT(tegra_sku_info.cpu_process_id);
60		versions[1] = BIT(tegra_sku_info.soc_speedo_id);
61	} else {
62		versions[0] = BIT(tegra_sku_info.cpu_process_id);
63		versions[1] = BIT(tegra_sku_info.cpu_speedo_id);
64	}
65
66	dev_info(&pdev->dev, "hardware version 0x%x 0x%x\n",
67		 versions[0], versions[1]);
68
69	cpu_dev = get_cpu_device(0);
70	if (WARN_ON(!cpu_dev))
71		return -ENODEV;
72
73	err = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2);
74	if (err < 0) {
75		dev_err(&pdev->dev, "failed to set supported hw: %d\n", err);
76		return err;
77	}
78
79	err = devm_add_action_or_reset(&pdev->dev,
80				       tegra20_cpufreq_put_supported_hw,
81				       (void *)((unsigned long) err));
82	if (err)
83		return err;
84
85	cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
86	err = PTR_ERR_OR_ZERO(cpufreq_dt);
87	if (err) {
88		dev_err(&pdev->dev,
89			"failed to create cpufreq-dt device: %d\n", err);
90		return err;
91	}
92
93	err = devm_add_action_or_reset(&pdev->dev,
94				       tegra20_cpufreq_dt_unregister,
95				       cpufreq_dt);
96	if (err)
97		return err;
98
99	return 0;
100}
101
102static struct platform_driver tegra20_cpufreq_driver = {
103	.probe		= tegra20_cpufreq_probe,
104	.driver		= {
105		.name	= "tegra20-cpufreq",
106	},
107};
108module_platform_driver(tegra20_cpufreq_driver);
109
110MODULE_ALIAS("platform:tegra20-cpufreq");
111MODULE_AUTHOR("Colin Cross <ccross@android.com>");
112MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver");
113MODULE_LICENSE("GPL");
114