diff options
Diffstat (limited to 'drivers/soc/tegra/common.c')
| -rw-r--r-- | drivers/soc/tegra/common.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c new file mode 100644 index 000000000..dff6d5ef4 --- /dev/null +++ b/drivers/soc/tegra/common.c @@ -0,0 +1,170 @@ +// 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; + /* + * The clk's connection id to set is NULL and this is a NULL terminated + * array, hence two NULL entries. + */ + const char *clk_names[] = { NULL, NULL }; + struct dev_pm_opp_config config = { + /* + * For some devices we don't have any OPP table in the DT, and + * in order to use the same code path for all the devices, we + * create a dummy OPP table for them via this. The dummy OPP + * table is only capable of doing clk_set_rate() on invocation + * of dev_pm_opp_set_rate() and doesn't provide any other + * functionality. + */ + .clk_names = clk_names, + }; + + if (of_machine_is_compatible("nvidia,tegra20")) { + hw_version = BIT(tegra_sku_info.soc_process_id); + config.supported_hw = &hw_version; + config.supported_hw_count = 1; + } else if (of_machine_is_compatible("nvidia,tegra30")) { + hw_version = BIT(tegra_sku_info.soc_speedo_id); + config.supported_hw = &hw_version; + config.supported_hw_count = 1; + } + + err = devm_pm_opp_set_config(dev, &config); + if (err) { + dev_err(dev, "failed to set OPP config: %d\n", err); + return err; + } + + /* + * Tegra114+ doesn't support OPP yet, return early for non tegra20/30 + * case. + */ + if (!config.supported_hw) + return -ENODEV; + + /* + * 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); |