v4.19.13 snapshot.
diff --git a/drivers/cpufreq/davinci-cpufreq.c b/drivers/cpufreq/davinci-cpufreq.c
new file mode 100644
index 0000000..d54a27c
--- /dev/null
+++ b/drivers/cpufreq/davinci-cpufreq.c
@@ -0,0 +1,161 @@
+/*
+ * CPU frequency scaling for DaVinci
+ *
+ * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Based on linux/arch/arm/plat-omap/cpu-omap.c. Original Copyright follows:
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
+ *
+ * Copyright (C) 2007-2008 Texas Instruments, Inc.
+ * Updated to support OMAP3
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/types.h>
+#include <linux/cpufreq.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/export.h>
+
+#include <mach/hardware.h>
+#include <mach/cpufreq.h>
+#include <mach/common.h>
+
+struct davinci_cpufreq {
+ struct device *dev;
+ struct clk *armclk;
+ struct clk *asyncclk;
+ unsigned long asyncrate;
+};
+static struct davinci_cpufreq cpufreq;
+
+static int davinci_target(struct cpufreq_policy *policy, unsigned int idx)
+{
+ struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data;
+ struct clk *armclk = cpufreq.armclk;
+ unsigned int old_freq, new_freq;
+ int ret = 0;
+
+ old_freq = policy->cur;
+ new_freq = pdata->freq_table[idx].frequency;
+
+ /* if moving to higher frequency, up the voltage beforehand */
+ if (pdata->set_voltage && new_freq > old_freq) {
+ ret = pdata->set_voltage(idx);
+ if (ret)
+ return ret;
+ }
+
+ ret = clk_set_rate(armclk, new_freq * 1000);
+ if (ret)
+ return ret;
+
+ if (cpufreq.asyncclk) {
+ ret = clk_set_rate(cpufreq.asyncclk, cpufreq.asyncrate);
+ if (ret)
+ return ret;
+ }
+
+ /* if moving to lower freq, lower the voltage after lowering freq */
+ if (pdata->set_voltage && new_freq < old_freq)
+ pdata->set_voltage(idx);
+
+ return 0;
+}
+
+static int davinci_cpu_init(struct cpufreq_policy *policy)
+{
+ int result = 0;
+ struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data;
+ struct cpufreq_frequency_table *freq_table = pdata->freq_table;
+
+ if (policy->cpu != 0)
+ return -EINVAL;
+
+ /* Finish platform specific initialization */
+ if (pdata->init) {
+ result = pdata->init();
+ if (result)
+ return result;
+ }
+
+ policy->clk = cpufreq.armclk;
+
+ /*
+ * Time measurement across the target() function yields ~1500-1800us
+ * time taken with no drivers on notification list.
+ * Setting the latency to 2000 us to accommodate addition of drivers
+ * to pre/post change notification list.
+ */
+ return cpufreq_generic_init(policy, freq_table, 2000 * 1000);
+}
+
+static struct cpufreq_driver davinci_driver = {
+ .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
+ .verify = cpufreq_generic_frequency_table_verify,
+ .target_index = davinci_target,
+ .get = cpufreq_generic_get,
+ .init = davinci_cpu_init,
+ .name = "davinci",
+ .attr = cpufreq_generic_attr,
+};
+
+static int __init davinci_cpufreq_probe(struct platform_device *pdev)
+{
+ struct davinci_cpufreq_config *pdata = pdev->dev.platform_data;
+ struct clk *asyncclk;
+
+ if (!pdata)
+ return -EINVAL;
+ if (!pdata->freq_table)
+ return -EINVAL;
+
+ cpufreq.dev = &pdev->dev;
+
+ cpufreq.armclk = clk_get(NULL, "arm");
+ if (IS_ERR(cpufreq.armclk)) {
+ dev_err(cpufreq.dev, "Unable to get ARM clock\n");
+ return PTR_ERR(cpufreq.armclk);
+ }
+
+ asyncclk = clk_get(cpufreq.dev, "async");
+ if (!IS_ERR(asyncclk)) {
+ cpufreq.asyncclk = asyncclk;
+ cpufreq.asyncrate = clk_get_rate(asyncclk);
+ }
+
+ return cpufreq_register_driver(&davinci_driver);
+}
+
+static int __exit davinci_cpufreq_remove(struct platform_device *pdev)
+{
+ clk_put(cpufreq.armclk);
+
+ if (cpufreq.asyncclk)
+ clk_put(cpufreq.asyncclk);
+
+ return cpufreq_unregister_driver(&davinci_driver);
+}
+
+static struct platform_driver davinci_cpufreq_driver = {
+ .driver = {
+ .name = "cpufreq-davinci",
+ },
+ .remove = __exit_p(davinci_cpufreq_remove),
+};
+
+int __init davinci_cpufreq_init(void)
+{
+ return platform_driver_probe(&davinci_cpufreq_driver,
+ davinci_cpufreq_probe);
+}
+