123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141 |
- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2018 Xilinx, Inc.
- *
- */
- #include <linux/err.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/reset-controller.h>
- #include <linux/firmware/xlnx-zynqmp.h>
- #include <linux/of_device.h>
- #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
- #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
- #define VERSAL_NR_RESETS 95
- struct zynqmp_reset_soc_data {
- u32 reset_id;
- u32 num_resets;
- };
- struct zynqmp_reset_data {
- struct reset_controller_dev rcdev;
- const struct zynqmp_reset_soc_data *data;
- };
- static inline struct zynqmp_reset_data *
- to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
- {
- return container_of(rcdev, struct zynqmp_reset_data, rcdev);
- }
- static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
- return zynqmp_pm_reset_assert(priv->data->reset_id + id,
- PM_RESET_ACTION_ASSERT);
- }
- static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
- return zynqmp_pm_reset_assert(priv->data->reset_id + id,
- PM_RESET_ACTION_RELEASE);
- }
- static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
- int err;
- u32 val;
- err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val);
- if (err)
- return err;
- return val;
- }
- static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
- return zynqmp_pm_reset_assert(priv->data->reset_id + id,
- PM_RESET_ACTION_PULSE);
- }
- static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev,
- const struct of_phandle_args *reset_spec)
- {
- return reset_spec->args[0];
- }
- static const struct zynqmp_reset_soc_data zynqmp_reset_data = {
- .reset_id = ZYNQMP_RESET_ID,
- .num_resets = ZYNQMP_NR_RESETS,
- };
- static const struct zynqmp_reset_soc_data versal_reset_data = {
- .reset_id = 0,
- .num_resets = VERSAL_NR_RESETS,
- };
- static const struct reset_control_ops zynqmp_reset_ops = {
- .reset = zynqmp_reset_reset,
- .assert = zynqmp_reset_assert,
- .deassert = zynqmp_reset_deassert,
- .status = zynqmp_reset_status,
- };
- static int zynqmp_reset_probe(struct platform_device *pdev)
- {
- struct zynqmp_reset_data *priv;
- priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
- if (!priv)
- return -ENOMEM;
- priv->data = of_device_get_match_data(&pdev->dev);
- if (!priv->data)
- return -EINVAL;
- platform_set_drvdata(pdev, priv);
- priv->rcdev.ops = &zynqmp_reset_ops;
- priv->rcdev.owner = THIS_MODULE;
- priv->rcdev.of_node = pdev->dev.of_node;
- priv->rcdev.nr_resets = priv->data->num_resets;
- priv->rcdev.of_reset_n_cells = 1;
- priv->rcdev.of_xlate = zynqmp_reset_of_xlate;
- return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
- }
- static const struct of_device_id zynqmp_reset_dt_ids[] = {
- { .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, },
- { .compatible = "xlnx,versal-reset", .data = &versal_reset_data, },
- { /* sentinel */ },
- };
- static struct platform_driver zynqmp_reset_driver = {
- .probe = zynqmp_reset_probe,
- .driver = {
- .name = KBUILD_MODNAME,
- .of_match_table = zynqmp_reset_dt_ids,
- },
- };
- static int __init zynqmp_reset_init(void)
- {
- return platform_driver_register(&zynqmp_reset_driver);
- }
- arch_initcall(zynqmp_reset_init);
|