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_get_property(np, "operating-points-v2", NULL))
 29		ret = true;
 30
 31	of_node_put(np);
 32	return ret;
 33}
 34
 35static void tegra20_cpufreq_put_supported_hw(void *opp_table)
 36{
 37	dev_pm_opp_put_supported_hw(opp_table);
 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 opp_table *opp_table;
 49	struct device *cpu_dev;
 50	u32 versions[2];
 51	int err;
 52
 53	if (!cpu0_node_has_opp_v2_prop()) {
 54		dev_err(&pdev->dev, "operating points not found\n");
 55		dev_err(&pdev->dev, "please update your device tree\n");
 56		return -ENODEV;
 57	}
 58
 59	if (of_machine_is_compatible("nvidia,tegra20")) {
 60		versions[0] = BIT(tegra_sku_info.cpu_process_id);
 61		versions[1] = BIT(tegra_sku_info.soc_speedo_id);
 62	} else {
 63		versions[0] = BIT(tegra_sku_info.cpu_process_id);
 64		versions[1] = BIT(tegra_sku_info.cpu_speedo_id);
 65	}
 66
 67	dev_info(&pdev->dev, "hardware version 0x%x 0x%x\n",
 68		 versions[0], versions[1]);
 69
 70	cpu_dev = get_cpu_device(0);
 71	if (WARN_ON(!cpu_dev))
 72		return -ENODEV;
 73
 74	opp_table = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2);
 75	err = PTR_ERR_OR_ZERO(opp_table);
 76	if (err) {
 77		dev_err(&pdev->dev, "failed to set supported hw: %d\n", err);
 78		return err;
 79	}
 80
 81	err = devm_add_action_or_reset(&pdev->dev,
 82				       tegra20_cpufreq_put_supported_hw,
 83				       opp_table);
 84	if (err)
 85		return err;
 86
 87	cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
 88	err = PTR_ERR_OR_ZERO(cpufreq_dt);
 89	if (err) {
 90		dev_err(&pdev->dev,
 91			"failed to create cpufreq-dt device: %d\n", err);
 92		return err;
 93	}
 94
 95	err = devm_add_action_or_reset(&pdev->dev,
 96				       tegra20_cpufreq_dt_unregister,
 97				       cpufreq_dt);
 98	if (err)
 99		return err;
100
101	return 0;
102}
103
104static struct platform_driver tegra20_cpufreq_driver = {
105	.probe		= tegra20_cpufreq_probe,
106	.driver		= {
107		.name	= "tegra20-cpufreq",
108	},
109};
110module_platform_driver(tegra20_cpufreq_driver);
111
112MODULE_ALIAS("platform:tegra20-cpufreq");
113MODULE_AUTHOR("Colin Cross <ccross@android.com>");
114MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver");
115MODULE_LICENSE("GPL");