1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/cpufreq/tegra20-cpufreq.c b/drivers/cpufreq/tegra20-cpufreq.c
new file mode 100644
index 000000000..111d4ff6f
--- /dev/null
+++ b/drivers/cpufreq/tegra20-cpufreq.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * Author:
+ *	Colin Cross <ccross@google.com>
+ *	Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation
+ */
+
+#include <linux/bits.h>
+#include <linux/cpu.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/types.h>
+
+#include <soc/tegra/common.h>
+#include <soc/tegra/fuse.h>
+
+static bool cpu0_node_has_opp_v2_prop(void)
+{
+	struct device_node *np = of_cpu_device_node_get(0);
+	bool ret = false;
+
+	if (of_property_present(np, "operating-points-v2"))
+		ret = true;
+
+	of_node_put(np);
+	return ret;
+}
+
+static int tegra20_cpufreq_probe(struct platform_device *pdev)
+{
+	struct platform_device *cpufreq_dt;
+	struct opp_table *opp_table;
+	struct device *cpu_dev;
+	u32 versions[2];
+	int err;
+
+	if (!cpu0_node_has_opp_v2_prop()) {
+		dev_err(&pdev->dev, "operating points not found\n");
+		dev_err(&pdev->dev, "please update your device tree\n");
+		return -ENODEV;
+	}
+
+	if (of_machine_is_compatible("nvidia,tegra20")) {
+		versions[0] = BIT(tegra_sku_info.cpu_process_id);
+		versions[1] = BIT(tegra_sku_info.soc_speedo_id);
+	} else {
+		versions[0] = BIT(tegra_sku_info.cpu_process_id);
+		versions[1] = BIT(tegra_sku_info.cpu_speedo_id);
+	}
+
+	dev_info(&pdev->dev, "hardware version 0x%x 0x%x\n",
+		 versions[0], versions[1]);
+
+	cpu_dev = get_cpu_device(0);
+	if (WARN_ON(!cpu_dev))
+		return -ENODEV;
+
+	opp_table = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2);
+	err = PTR_ERR_OR_ZERO(opp_table);
+	if (err) {
+		dev_err(&pdev->dev, "failed to set supported hw: %d\n", err);
+		return err;
+	}
+
+	cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+	err = PTR_ERR_OR_ZERO(cpufreq_dt);
+	if (err) {
+		dev_err(&pdev->dev,
+			"failed to create cpufreq-dt device: %d\n", err);
+		goto err_put_supported_hw;
+	}
+
+	platform_set_drvdata(pdev, cpufreq_dt);
+
+	return 0;
+
+err_put_supported_hw:
+	dev_pm_opp_put_supported_hw(opp_table);
+
+	return err;
+}
+
+static int tegra20_cpufreq_remove(struct platform_device *pdev)
+{
+	struct platform_device *cpufreq_dt;
+	struct opp_table *opp_table;
+
+	cpufreq_dt = platform_get_drvdata(pdev);
+	platform_device_unregister(cpufreq_dt);
+
+	opp_table = dev_pm_opp_get_opp_table(get_cpu_device(0));
+	dev_pm_opp_put_supported_hw(opp_table);
+	dev_pm_opp_put_opp_table(opp_table);
+
+	return 0;
+}
+
+static struct platform_driver tegra20_cpufreq_driver = {
+	.probe		= tegra20_cpufreq_probe,
+	.remove		= tegra20_cpufreq_remove,
+	.driver		= {
+		.name	= "tegra20-cpufreq",
+	},
+};
+module_platform_driver(tegra20_cpufreq_driver);
+
+MODULE_ALIAS("platform:tegra20-cpufreq");
+MODULE_AUTHOR("Colin Cross <ccross@android.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver");
+MODULE_LICENSE("GPL");