154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2014 NVIDIA CORPORATION. All rights reserved.
|
|
*/
|
|
|
|
#define dev_fmt(fmt) "tegra-soc: " fmt
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/device.h>
|
|
#include <linux/export.h>
|
|
#include <linux/of.h>
|
|
#include <linux/pm_opp.h>
|
|
#include <linux/pm_runtime.h>
|
|
|
|
#include <soc/tegra/common.h>
|
|
#include <soc/tegra/fuse.h>
|
|
|
|
static const struct of_device_id tegra_machine_match[] = {
|
|
{ .compatible = "nvidia,tegra20", },
|
|
{ .compatible = "nvidia,tegra30", },
|
|
{ .compatible = "nvidia,tegra114", },
|
|
{ .compatible = "nvidia,tegra124", },
|
|
{ .compatible = "nvidia,tegra132", },
|
|
{ .compatible = "nvidia,tegra210", },
|
|
{ }
|
|
};
|
|
|
|
bool soc_is_tegra(void)
|
|
{
|
|
const struct of_device_id *match;
|
|
struct device_node *root;
|
|
|
|
root = of_find_node_by_path("/");
|
|
if (!root)
|
|
return false;
|
|
|
|
match = of_match_node(tegra_machine_match, root);
|
|
of_node_put(root);
|
|
|
|
return match != NULL;
|
|
}
|
|
|
|
static int tegra_core_dev_init_opp_state(struct device *dev)
|
|
{
|
|
unsigned long rate;
|
|
struct clk *clk;
|
|
bool rpm_enabled;
|
|
int err;
|
|
|
|
clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(clk)) {
|
|
dev_err(dev, "failed to get clk: %pe\n", clk);
|
|
return PTR_ERR(clk);
|
|
}
|
|
|
|
rate = clk_get_rate(clk);
|
|
if (!rate) {
|
|
dev_err(dev, "failed to get clk rate\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Runtime PM of the device must be enabled in order to set up
|
|
* GENPD's performance properly because GENPD core checks whether
|
|
* device is suspended and this check doesn't work while RPM is
|
|
* disabled. This makes sure the OPP vote below gets cached in
|
|
* GENPD for the device. Instead, the vote is done the next time
|
|
* the device gets runtime resumed.
|
|
*/
|
|
rpm_enabled = pm_runtime_enabled(dev);
|
|
if (!rpm_enabled)
|
|
pm_runtime_enable(dev);
|
|
|
|
/* should never happen in practice */
|
|
if (!pm_runtime_enabled(dev)) {
|
|
dev_WARN(dev, "failed to enable runtime PM\n");
|
|
pm_runtime_disable(dev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* first dummy rate-setting initializes voltage vote */
|
|
err = dev_pm_opp_set_rate(dev, rate);
|
|
|
|
if (!rpm_enabled)
|
|
pm_runtime_disable(dev);
|
|
|
|
if (err) {
|
|
dev_err(dev, "failed to initialize OPP clock: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* devm_tegra_core_dev_init_opp_table() - initialize OPP table
|
|
* @dev: device for which OPP table is initialized
|
|
* @params: pointer to the OPP table configuration
|
|
*
|
|
* This function will initialize OPP table and sync OPP state of a Tegra SoC
|
|
* core device.
|
|
*
|
|
* Return: 0 on success or errorno.
|
|
*/
|
|
int devm_tegra_core_dev_init_opp_table(struct device *dev,
|
|
struct tegra_core_opp_params *params)
|
|
{
|
|
u32 hw_version;
|
|
int err;
|
|
|
|
err = devm_pm_opp_set_clkname(dev, NULL);
|
|
if (err) {
|
|
dev_err(dev, "failed to set OPP clk: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/* Tegra114+ doesn't support OPP yet */
|
|
if (!of_machine_is_compatible("nvidia,tegra20") &&
|
|
!of_machine_is_compatible("nvidia,tegra30"))
|
|
return -ENODEV;
|
|
|
|
if (of_machine_is_compatible("nvidia,tegra20"))
|
|
hw_version = BIT(tegra_sku_info.soc_process_id);
|
|
else
|
|
hw_version = BIT(tegra_sku_info.soc_speedo_id);
|
|
|
|
err = devm_pm_opp_set_supported_hw(dev, &hw_version, 1);
|
|
if (err) {
|
|
dev_err(dev, "failed to set OPP supported HW: %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Older device-trees have an empty OPP table, we will get
|
|
* -ENODEV from devm_pm_opp_of_add_table() in this case.
|
|
*/
|
|
err = devm_pm_opp_of_add_table(dev);
|
|
if (err) {
|
|
if (err != -ENODEV)
|
|
dev_err(dev, "failed to add OPP table: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
if (params->init_state) {
|
|
err = tegra_core_dev_init_opp_state(dev);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_tegra_core_dev_init_opp_table);
|