1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018 Xilinx, Inc. 4 * 5 */ 6 7 #include <linux/err.h> 8 #include <linux/of.h> 9 #include <linux/platform_device.h> 10 #include <linux/reset-controller.h> 11 #include <linux/firmware/xlnx-zynqmp.h> 12 13 #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START) 14 #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START 15 16 struct zynqmp_reset_data { 17 struct reset_controller_dev rcdev; 18 const struct zynqmp_eemi_ops *eemi_ops; 19 }; 20 21 static inline struct zynqmp_reset_data * 22 to_zynqmp_reset_data(struct reset_controller_dev *rcdev) 23 { 24 return container_of(rcdev, struct zynqmp_reset_data, rcdev); 25 } 26 27 static int zynqmp_reset_assert(struct reset_controller_dev *rcdev, 28 unsigned long id) 29 { 30 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 31 32 return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id, 33 PM_RESET_ACTION_ASSERT); 34 } 35 36 static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev, 37 unsigned long id) 38 { 39 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 40 41 return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id, 42 PM_RESET_ACTION_RELEASE); 43 } 44 45 static int zynqmp_reset_status(struct reset_controller_dev *rcdev, 46 unsigned long id) 47 { 48 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 49 int val, err; 50 51 err = priv->eemi_ops->reset_get_status(ZYNQMP_RESET_ID + id, &val); 52 if (err) 53 return err; 54 55 return val; 56 } 57 58 static int zynqmp_reset_reset(struct reset_controller_dev *rcdev, 59 unsigned long id) 60 { 61 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 62 63 return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id, 64 PM_RESET_ACTION_PULSE); 65 } 66 67 static struct reset_control_ops zynqmp_reset_ops = { 68 .reset = zynqmp_reset_reset, 69 .assert = zynqmp_reset_assert, 70 .deassert = zynqmp_reset_deassert, 71 .status = zynqmp_reset_status, 72 }; 73 74 static int zynqmp_reset_probe(struct platform_device *pdev) 75 { 76 struct zynqmp_reset_data *priv; 77 78 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 79 if (!priv) 80 return -ENOMEM; 81 82 priv->eemi_ops = zynqmp_pm_get_eemi_ops(); 83 if (IS_ERR(priv->eemi_ops)) 84 return PTR_ERR(priv->eemi_ops); 85 86 platform_set_drvdata(pdev, priv); 87 88 priv->rcdev.ops = &zynqmp_reset_ops; 89 priv->rcdev.owner = THIS_MODULE; 90 priv->rcdev.of_node = pdev->dev.of_node; 91 priv->rcdev.nr_resets = ZYNQMP_NR_RESETS; 92 93 return devm_reset_controller_register(&pdev->dev, &priv->rcdev); 94 } 95 96 static const struct of_device_id zynqmp_reset_dt_ids[] = { 97 { .compatible = "xlnx,zynqmp-reset", }, 98 { /* sentinel */ }, 99 }; 100 101 static struct platform_driver zynqmp_reset_driver = { 102 .probe = zynqmp_reset_probe, 103 .driver = { 104 .name = KBUILD_MODNAME, 105 .of_match_table = zynqmp_reset_dt_ids, 106 }, 107 }; 108 109 static int __init zynqmp_reset_init(void) 110 { 111 return platform_driver_register(&zynqmp_reset_driver); 112 } 113 114 arch_initcall(zynqmp_reset_init); 115