summaryrefslogtreecommitdiffstats
path: root/drivers/cpufreq/tegra20-cpufreq.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/cpufreq/tegra20-cpufreq.c')
-rw-r--r--drivers/cpufreq/tegra20-cpufreq.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/cpufreq/tegra20-cpufreq.c b/drivers/cpufreq/tegra20-cpufreq.c
new file mode 100644
index 0000000000..a573186704
--- /dev/null
+++ b/drivers/cpufreq/tegra20-cpufreq.c
@@ -0,0 +1,113 @@
+// 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.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 void tegra20_cpufreq_put_supported_hw(void *opp_token)
+{
+ dev_pm_opp_put_supported_hw((unsigned long) opp_token);
+}
+
+static void tegra20_cpufreq_dt_unregister(void *cpufreq_dt)
+{
+ platform_device_unregister(cpufreq_dt);
+}
+
+static int tegra20_cpufreq_probe(struct platform_device *pdev)
+{
+ struct platform_device *cpufreq_dt;
+ 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;
+
+ err = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2);
+ if (err < 0) {
+ dev_err(&pdev->dev, "failed to set supported hw: %d\n", err);
+ return err;
+ }
+
+ err = devm_add_action_or_reset(&pdev->dev,
+ tegra20_cpufreq_put_supported_hw,
+ (void *)((unsigned long) err));
+ if (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);
+ return err;
+ }
+
+ err = devm_add_action_or_reset(&pdev->dev,
+ tegra20_cpufreq_dt_unregister,
+ cpufreq_dt);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static struct platform_driver tegra20_cpufreq_driver = {
+ .probe = tegra20_cpufreq_probe,
+ .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");