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115 lines
2.7 KiB
115 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2010 Google, Inc. |
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* |
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* Author: |
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* Colin Cross <[email protected]> |
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* Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation |
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*/ |
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#include <linux/bits.h> |
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#include <linux/cpu.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_opp.h> |
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#include <linux/types.h> |
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#include <soc/tegra/common.h> |
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#include <soc/tegra/fuse.h> |
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static bool cpu0_node_has_opp_v2_prop(void) |
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{ |
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struct device_node *np = of_cpu_device_node_get(0); |
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bool ret = false; |
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if (of_get_property(np, "operating-points-v2", NULL)) |
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ret = true; |
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of_node_put(np); |
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return ret; |
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} |
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static void tegra20_cpufreq_put_supported_hw(void *opp_table) |
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{ |
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dev_pm_opp_put_supported_hw(opp_table); |
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} |
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static void tegra20_cpufreq_dt_unregister(void *cpufreq_dt) |
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{ |
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platform_device_unregister(cpufreq_dt); |
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} |
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static int tegra20_cpufreq_probe(struct platform_device *pdev) |
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{ |
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struct platform_device *cpufreq_dt; |
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struct opp_table *opp_table; |
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struct device *cpu_dev; |
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u32 versions[2]; |
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int err; |
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if (!cpu0_node_has_opp_v2_prop()) { |
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dev_err(&pdev->dev, "operating points not found\n"); |
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dev_err(&pdev->dev, "please update your device tree\n"); |
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return -ENODEV; |
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} |
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if (of_machine_is_compatible("nvidia,tegra20")) { |
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versions[0] = BIT(tegra_sku_info.cpu_process_id); |
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versions[1] = BIT(tegra_sku_info.soc_speedo_id); |
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} else { |
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versions[0] = BIT(tegra_sku_info.cpu_process_id); |
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versions[1] = BIT(tegra_sku_info.cpu_speedo_id); |
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} |
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dev_info(&pdev->dev, "hardware version 0x%x 0x%x\n", |
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versions[0], versions[1]); |
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cpu_dev = get_cpu_device(0); |
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if (WARN_ON(!cpu_dev)) |
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return -ENODEV; |
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opp_table = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2); |
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err = PTR_ERR_OR_ZERO(opp_table); |
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if (err) { |
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dev_err(&pdev->dev, "failed to set supported hw: %d\n", err); |
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return err; |
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} |
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err = devm_add_action_or_reset(&pdev->dev, |
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tegra20_cpufreq_put_supported_hw, |
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opp_table); |
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if (err) |
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return err; |
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cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0); |
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err = PTR_ERR_OR_ZERO(cpufreq_dt); |
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if (err) { |
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dev_err(&pdev->dev, |
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"failed to create cpufreq-dt device: %d\n", err); |
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return err; |
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} |
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err = devm_add_action_or_reset(&pdev->dev, |
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tegra20_cpufreq_dt_unregister, |
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cpufreq_dt); |
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if (err) |
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return err; |
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return 0; |
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} |
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static struct platform_driver tegra20_cpufreq_driver = { |
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.probe = tegra20_cpufreq_probe, |
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.driver = { |
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.name = "tegra20-cpufreq", |
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}, |
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}; |
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module_platform_driver(tegra20_cpufreq_driver); |
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MODULE_ALIAS("platform:tegra20-cpufreq"); |
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MODULE_AUTHOR("Colin Cross <[email protected]>"); |
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MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver"); |
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MODULE_LICENSE("GPL");
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