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1// SPDX-License-Identifier: GPL-2.0-only2/*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 Corporation8 */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