1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2016, NVIDIA CORPORATION. 4 */ 5 6 #include <common.h> 7 #include <dm.h> 8 #include <fdtdec.h> 9 #include <reset.h> 10 #include <reset-uclass.h> 11 12 static inline struct reset_ops *reset_dev_ops(struct udevice *dev) 13 { 14 return (struct reset_ops *)dev->driver->ops; 15 } 16 17 static int reset_of_xlate_default(struct reset_ctl *reset_ctl, 18 struct ofnode_phandle_args *args) 19 { 20 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 21 22 if (args->args_count != 1) { 23 debug("Invaild args_count: %d\n", args->args_count); 24 return -EINVAL; 25 } 26 27 reset_ctl->id = args->args[0]; 28 29 return 0; 30 } 31 32 int reset_get_by_index(struct udevice *dev, int index, 33 struct reset_ctl *reset_ctl) 34 { 35 struct ofnode_phandle_args args; 36 int ret; 37 struct udevice *dev_reset; 38 struct reset_ops *ops; 39 40 debug("%s(dev=%p, index=%d, reset_ctl=%p)\n", __func__, dev, index, 41 reset_ctl); 42 reset_ctl->dev = NULL; 43 44 ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0, 45 index, &args); 46 if (ret) { 47 debug("%s: fdtdec_parse_phandle_with_args() failed: %d\n", 48 __func__, ret); 49 return ret; 50 } 51 52 ret = uclass_get_device_by_ofnode(UCLASS_RESET, args.node, 53 &dev_reset); 54 if (ret) { 55 debug("%s: uclass_get_device_by_ofnode() failed: %d\n", 56 __func__, ret); 57 debug("%s %d\n", ofnode_get_name(args.node), args.args[0]); 58 return ret; 59 } 60 ops = reset_dev_ops(dev_reset); 61 62 reset_ctl->dev = dev_reset; 63 if (ops->of_xlate) 64 ret = ops->of_xlate(reset_ctl, &args); 65 else 66 ret = reset_of_xlate_default(reset_ctl, &args); 67 if (ret) { 68 debug("of_xlate() failed: %d\n", ret); 69 return ret; 70 } 71 72 ret = ops->request(reset_ctl); 73 if (ret) { 74 debug("ops->request() failed: %d\n", ret); 75 return ret; 76 } 77 78 return 0; 79 } 80 81 int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk) 82 { 83 int i, ret, err, count; 84 85 bulk->count = 0; 86 87 count = dev_count_phandle_with_args(dev, "resets", "#reset-cells"); 88 if (count < 1) 89 return count; 90 91 bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl), 92 GFP_KERNEL); 93 if (!bulk->resets) 94 return -ENOMEM; 95 96 for (i = 0; i < count; i++) { 97 ret = reset_get_by_index(dev, i, &bulk->resets[i]); 98 if (ret < 0) 99 goto bulk_get_err; 100 101 ++bulk->count; 102 } 103 104 return 0; 105 106 bulk_get_err: 107 err = reset_release_all(bulk->resets, bulk->count); 108 if (err) 109 debug("%s: could release all resets for %p\n", 110 __func__, dev); 111 112 return ret; 113 } 114 115 int reset_get_by_name(struct udevice *dev, const char *name, 116 struct reset_ctl *reset_ctl) 117 { 118 int index; 119 120 debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name, 121 reset_ctl); 122 reset_ctl->dev = NULL; 123 124 index = dev_read_stringlist_search(dev, "reset-names", name); 125 if (index < 0) { 126 debug("fdt_stringlist_search() failed: %d\n", index); 127 return index; 128 } 129 130 return reset_get_by_index(dev, index, reset_ctl); 131 } 132 133 int reset_request(struct reset_ctl *reset_ctl) 134 { 135 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 136 137 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 138 139 return ops->request(reset_ctl); 140 } 141 142 int reset_free(struct reset_ctl *reset_ctl) 143 { 144 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 145 146 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 147 148 return ops->free(reset_ctl); 149 } 150 151 int reset_assert(struct reset_ctl *reset_ctl) 152 { 153 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 154 155 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 156 157 return ops->rst_assert(reset_ctl); 158 } 159 160 int reset_assert_bulk(struct reset_ctl_bulk *bulk) 161 { 162 int i, ret; 163 164 for (i = 0; i < bulk->count; i++) { 165 ret = reset_assert(&bulk->resets[i]); 166 if (ret < 0) 167 return ret; 168 } 169 170 return 0; 171 } 172 173 int reset_deassert(struct reset_ctl *reset_ctl) 174 { 175 struct reset_ops *ops = reset_dev_ops(reset_ctl->dev); 176 177 debug("%s(reset_ctl=%p)\n", __func__, reset_ctl); 178 179 return ops->rst_deassert(reset_ctl); 180 } 181 182 int reset_deassert_bulk(struct reset_ctl_bulk *bulk) 183 { 184 int i, ret; 185 186 for (i = 0; i < bulk->count; i++) { 187 ret = reset_deassert(&bulk->resets[i]); 188 if (ret < 0) 189 return ret; 190 } 191 192 return 0; 193 } 194 195 int reset_release_all(struct reset_ctl *reset_ctl, int count) 196 { 197 int i, ret; 198 199 for (i = 0; i < count; i++) { 200 debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]); 201 202 /* check if reset has been previously requested */ 203 if (!reset_ctl[i].dev) 204 continue; 205 206 ret = reset_assert(&reset_ctl[i]); 207 if (ret) 208 return ret; 209 210 ret = reset_free(&reset_ctl[i]); 211 if (ret) 212 return ret; 213 } 214 215 return 0; 216 } 217 218 UCLASS_DRIVER(reset) = { 219 .id = UCLASS_RESET, 220 .name = "reset", 221 }; 222