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 err; 57 u32 val; 58 59 err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val); 60 if (err) 61 return err; 62 63 return val; 64 } 65 66 static int zynqmp_reset_reset(struct reset_controller_dev *rcdev, 67 unsigned long id) 68 { 69 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); 70 71 return zynqmp_pm_reset_assert(priv->data->reset_id + id, 72 PM_RESET_ACTION_PULSE); 73 } 74 75 static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev, 76 const struct of_phandle_args *reset_spec) 77 { 78 return reset_spec->args[0]; 79 } 80 81 static const struct zynqmp_reset_soc_data zynqmp_reset_data = { 82 .reset_id = ZYNQMP_RESET_ID, 83 .num_resets = ZYNQMP_NR_RESETS, 84 }; 85 86 static const struct zynqmp_reset_soc_data versal_reset_data = { 87 .reset_id = 0, 88 .num_resets = VERSAL_NR_RESETS, 89 }; 90 91 static const struct reset_control_ops zynqmp_reset_ops = { 92 .reset = zynqmp_reset_reset, 93 .assert = zynqmp_reset_assert, 94 .deassert = zynqmp_reset_deassert, 95 .status = zynqmp_reset_status, 96 }; 97 98 static int zynqmp_reset_probe(struct platform_device *pdev) 99 { 100 struct zynqmp_reset_data *priv; 101 102 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 103 if (!priv) 104 return -ENOMEM; 105 106 priv->data = of_device_get_match_data(&pdev->dev); 107 if (!priv->data) 108 return -EINVAL; 109 110 platform_set_drvdata(pdev, priv); 111 112 priv->rcdev.ops = &zynqmp_reset_ops; 113 priv->rcdev.owner = THIS_MODULE; 114 priv->rcdev.of_node = pdev->dev.of_node; 115 priv->rcdev.nr_resets = priv->data->num_resets; 116 priv->rcdev.of_reset_n_cells = 1; 117 priv->rcdev.of_xlate = zynqmp_reset_of_xlate; 118 119 return devm_reset_controller_register(&pdev->dev, &priv->rcdev); 120 } 121 122 static const struct of_device_id zynqmp_reset_dt_ids[] = { 123 { .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, }, 124 { .compatible = "xlnx,versal-reset", .data = &versal_reset_data, }, 125 { /* sentinel */ }, 126 }; 127 128 static struct platform_driver zynqmp_reset_driver = { 129 .probe = zynqmp_reset_probe, 130 .driver = { 131 .name = KBUILD_MODNAME, 132 .of_match_table = zynqmp_reset_dt_ids, 133 }, 134 }; 135 136 static int __init zynqmp_reset_init(void) 137 { 138 return platform_driver_register(&zynqmp_reset_driver); 139 } 140 141 arch_initcall(zynqmp_reset_init); 142