1 /* 2 * Copyright (c) 2016, NVIDIA CORPORATION. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <fdtdec.h> 10 #include <reset.h> 11 #include <reset-uclass.h> 12 13 DECLARE_GLOBAL_DATA_PTR; 14 15 static inline struct reset_ops *reset_dev_ops(struct udevice *dev) 16 { 17 return (struct reset_ops *)dev->driver->ops; 18 } 19 20 static int reset_of_xlate_default(struct reset_ctl *reset_ctl, 21 struct fdtdec_phandle_args *args) 22 { 23 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 24 25 if (args->args_count != 1) { 26 debug("Invaild args_count: %d\n", args->args_count); 27 return -EINVAL; 28 } 29 30 reset_ctl->id = args->args[0]; 31 32 return 0; 33 } 34 35 int reset_get_by_index(struct udevice *dev, int index, 36 struct reset_ctl *reset_ctl) 37 { 38 struct fdtdec_phandle_args args; 39 int ret; 40 struct udevice *dev_reset; 41 struct reset_ops *ops; 42 43 debug("%s(dev=%p, index=%d, reset_ctl=%p)\n", __func__, dev, index, 44 reset_ctl); 45 46 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev), 47 "resets", "#reset-cells", 0, 48 index, &args); 49 if (ret) { 50 debug("%s: fdtdec_parse_phandle_with_args failed: %d\n", 51 __func__, ret); 52 return ret; 53 } 54 55 ret = uclass_get_device_by_of_offset(UCLASS_RESET, args.node, 56 &dev_reset); 57 if (ret) { 58 debug("%s: uclass_get_device_by_of_offset failed: %d\n", 59 __func__, ret); 60 return ret; 61 } 62 ops = reset_dev_ops(dev_reset); 63 64 reset_ctl->dev = dev_reset; 65 if (ops->of_xlate) 66 ret = ops->of_xlate(reset_ctl, &args); 67 else 68 ret = reset_of_xlate_default(reset_ctl, &args); 69 if (ret) { 70 debug("of_xlate() failed: %d\n", ret); 71 return ret; 72 } 73 74 ret = ops->request(reset_ctl); 75 if (ret) { 76 debug("ops->request() failed: %d\n", ret); 77 return ret; 78 } 79 80 return 0; 81 } 82 83 int reset_get_by_name(struct udevice *dev, const char *name, 84 struct reset_ctl *reset_ctl) 85 { 86 int index; 87 88 debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name, 89 reset_ctl); 90 91 index = fdt_stringlist_search(gd->fdt_blob, dev_of_offset(dev), 92 "reset-names", name); 93 if (index < 0) { 94 debug("fdt_stringlist_search() failed: %d\n", index); 95 return index; 96 } 97 98 return reset_get_by_index(dev, index, reset_ctl); 99 } 100 101 int reset_free(struct reset_ctl *reset_ctl) 102 { 103 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 104 105 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 106 107 return ops->free(reset_ctl); 108 } 109 110 int reset_assert(struct reset_ctl *reset_ctl) 111 { 112 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 113 114 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 115 116 return ops->rst_assert(reset_ctl); 117 } 118 119 int reset_deassert(struct reset_ctl *reset_ctl) 120 { 121 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 122 123 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 124 125 return ops->rst_deassert(reset_ctl); 126 } 127 128 UCLASS_DRIVER(reset) = { 129 .id = UCLASS_RESET, 130 .name = "reset", 131 }; 132