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 #include <linux/of_device.h> 13 14 #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START) 15 #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START 16 #define VERSAL_NR_RESETS 95 17 18 struct zynqmp_reset_soc_data { 19 u32 reset_id; 20 u32 num_resets; 21 }; 22 23 struct zynqmp_reset_data { 24 struct reset_controller_dev rcdev; 25 const struct zynqmp_reset_soc_data *data; 26 }; 27 28 static inline struct zynqmp_reset_data * 29 to_zynqmp_reset_data(struct reset_controller_dev *rcdev) 30 { 31 return container_of(rcdev, struct zynqmp_reset_data, rcdev); 32 } 33 34 static int zynqmp_reset_assert(struct reset_controller_dev *rcdev, 35 unsigned long id) 36 { 37 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 38 39 return zynqmp_pm_reset_assert(priv->data->reset_id + id, 40 PM_RESET_ACTION_ASSERT); 41 } 42 43 static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev, 44 unsigned long id) 45 { 46 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 47 48 return zynqmp_pm_reset_assert(priv->data->reset_id + id, 49 PM_RESET_ACTION_RELEASE); 50 } 51 52 static int zynqmp_reset_status(struct reset_controller_dev *rcdev, 53 unsigned long id) 54 { 55 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 56 int val, err; 57 58 err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val); 59 if (err) 60 return err; 61 62 return val; 63 } 64 65 static int zynqmp_reset_reset(struct reset_controller_dev *rcdev, 66 unsigned long id) 67 { 68 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 69 70 return zynqmp_pm_reset_assert(priv->data->reset_id + id, 71 PM_RESET_ACTION_PULSE); 72 } 73 74 static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev, 75 const struct of_phandle_args *reset_spec) 76 { 77 return reset_spec->args[0]; 78 } 79 80 static const struct zynqmp_reset_soc_data zynqmp_reset_data = { 81 .reset_id = ZYNQMP_RESET_ID, 82 .num_resets = ZYNQMP_NR_RESETS, 83 }; 84 85 static const struct zynqmp_reset_soc_data versal_reset_data = { 86 .reset_id = 0, 87 .num_resets = VERSAL_NR_RESETS, 88 }; 89 90 static const struct reset_control_ops zynqmp_reset_ops = { 91 .reset = zynqmp_reset_reset, 92 .assert = zynqmp_reset_assert, 93 .deassert = zynqmp_reset_deassert, 94 .status = zynqmp_reset_status, 95 }; 96 97 static int zynqmp_reset_probe(struct platform_device *pdev) 98 { 99 struct zynqmp_reset_data *priv; 100 101 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 102 if (!priv) 103 return -ENOMEM; 104 105 priv->data = of_device_get_match_data(&pdev->dev); 106 if (!priv->data) 107 return -EINVAL; 108 109 platform_set_drvdata(pdev, priv); 110 111 priv->rcdev.ops = &zynqmp_reset_ops; 112 priv->rcdev.owner = THIS_MODULE; 113 priv->rcdev.of_node = pdev->dev.of_node; 114 priv->rcdev.nr_resets = priv->data->num_resets; 115 priv->rcdev.of_reset_n_cells = 1; 116 priv->rcdev.of_xlate = zynqmp_reset_of_xlate; 117 118 return devm_reset_controller_register(&pdev->dev, &priv->rcdev); 119 } 120 121 static const struct of_device_id zynqmp_reset_dt_ids[] = { 122 { .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, }, 123 { .compatible = "xlnx,versal-reset", .data = &versal_reset_data, }, 124 { /* sentinel */ }, 125 }; 126 127 static struct platform_driver zynqmp_reset_driver = { 128 .probe = zynqmp_reset_probe, 129 .driver = { 130 .name = KBUILD_MODNAME, 131 .of_match_table = zynqmp_reset_dt_ids, 132 }, 133 }; 134 135 static int __init zynqmp_reset_init(void) 136 { 137 return platform_driver_register(&zynqmp_reset_driver); 138 } 139 140 arch_initcall(zynqmp_reset_init); 141