1 /* 2 * Copyright (C) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * Copyright (c) 2016, NVIDIA CORPORATION. 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <clk.h> 11 #include <clk-uclass.h> 12 #include <dm.h> 13 #include <dt-structs.h> 14 #include <errno.h> 15 16 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev) 17 { 18 return (const struct clk_ops *)dev->driver->ops; 19 } 20 21 #if CONFIG_IS_ENABLED(OF_CONTROL) 22 # if CONFIG_IS_ENABLED(OF_PLATDATA) 23 int clk_get_by_index_platdata(struct udevice *dev, int index, 24 struct phandle_1_arg *cells, struct clk *clk) 25 { 26 int ret; 27 28 if (index != 0) 29 return -ENOSYS; 30 ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev); 31 if (ret) 32 return ret; 33 clk->id = cells[0].arg[0]; 34 35 return 0; 36 } 37 # else 38 static int clk_of_xlate_default(struct clk *clk, 39 struct ofnode_phandle_args *args) 40 { 41 debug("%s(clk=%p)\n", __func__, clk); 42 43 if (args->args_count > 1) { 44 debug("Invaild args_count: %d\n", args->args_count); 45 return -EINVAL; 46 } 47 48 if (args->args_count) 49 clk->id = args->args[0]; 50 else 51 clk->id = 0; 52 53 return 0; 54 } 55 56 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name, 57 int index, struct clk *clk) 58 { 59 int ret; 60 struct ofnode_phandle_args args; 61 struct udevice *dev_clk; 62 const struct clk_ops *ops; 63 64 debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk); 65 66 assert(clk); 67 clk->dev = NULL; 68 69 ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0, 70 index, &args); 71 if (ret) { 72 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n", 73 __func__, ret); 74 return ret; 75 } 76 77 ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk); 78 if (ret) { 79 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n", 80 __func__, ret); 81 return ret; 82 } 83 84 clk->dev = dev_clk; 85 86 ops = clk_dev_ops(dev_clk); 87 88 if (ops->of_xlate) 89 ret = ops->of_xlate(clk, &args); 90 else 91 ret = clk_of_xlate_default(clk, &args); 92 if (ret) { 93 debug("of_xlate() failed: %d\n", ret); 94 return ret; 95 } 96 97 return clk_request(dev_clk, clk); 98 } 99 100 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) 101 { 102 return clk_get_by_indexed_prop(dev, "clocks", index, clk); 103 } 104 # endif /* OF_PLATDATA */ 105 106 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) 107 { 108 int index; 109 110 debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk); 111 clk->dev = NULL; 112 113 index = dev_read_stringlist_search(dev, "clock-names", name); 114 if (index < 0) { 115 debug("fdt_stringlist_search() failed: %d\n", index); 116 return index; 117 } 118 119 return clk_get_by_index(dev, index, clk); 120 } 121 122 int clk_release_all(struct clk *clk, int count) 123 { 124 int i, ret; 125 126 for (i = 0; i < count; i++) { 127 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]); 128 129 /* check if clock has been previously requested */ 130 if (!clk[i].dev) 131 continue; 132 133 ret = clk_disable(&clk[i]); 134 if (ret && ret != -ENOSYS) 135 return ret; 136 137 ret = clk_free(&clk[i]); 138 if (ret && ret != -ENOSYS) 139 return ret; 140 } 141 142 return 0; 143 } 144 145 #endif /* OF_CONTROL */ 146 147 int clk_request(struct udevice *dev, struct clk *clk) 148 { 149 const struct clk_ops *ops = clk_dev_ops(dev); 150 151 debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); 152 153 clk->dev = dev; 154 155 if (!ops->request) 156 return 0; 157 158 return ops->request(clk); 159 } 160 161 int clk_free(struct clk *clk) 162 { 163 const struct clk_ops *ops = clk_dev_ops(clk->dev); 164 165 debug("%s(clk=%p)\n", __func__, clk); 166 167 if (!ops->free) 168 return 0; 169 170 return ops->free(clk); 171 } 172 173 ulong clk_get_rate(struct clk *clk) 174 { 175 const struct clk_ops *ops = clk_dev_ops(clk->dev); 176 177 debug("%s(clk=%p)\n", __func__, clk); 178 179 if (!ops->get_rate) 180 return -ENOSYS; 181 182 return ops->get_rate(clk); 183 } 184 185 ulong clk_set_rate(struct clk *clk, ulong rate) 186 { 187 const struct clk_ops *ops = clk_dev_ops(clk->dev); 188 189 debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); 190 191 if (!ops->set_rate) 192 return -ENOSYS; 193 194 return ops->set_rate(clk, rate); 195 } 196 197 int clk_get_phase(struct clk *clk) 198 { 199 const struct clk_ops *ops = clk_dev_ops(clk->dev); 200 201 if (!ops->get_phase) 202 return -ENOSYS; 203 204 return ops->get_phase(clk); 205 } 206 207 int clk_set_phase(struct clk *clk, int degrees) 208 { 209 const struct clk_ops *ops = clk_dev_ops(clk->dev); 210 211 if (!ops->set_phase) 212 return -ENOSYS; 213 214 return ops->set_phase(clk, degrees); 215 } 216 217 int clk_set_parent(struct clk *clk, struct clk *parent) 218 { 219 const struct clk_ops *ops = clk_dev_ops(clk->dev); 220 221 debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent); 222 223 if (!ops->set_parent) 224 return -ENOSYS; 225 226 return ops->set_parent(clk, parent); 227 } 228 229 int clk_enable(struct clk *clk) 230 { 231 const struct clk_ops *ops = clk_dev_ops(clk->dev); 232 233 debug("%s(clk=%p)\n", __func__, clk); 234 235 if (!ops->enable) 236 return -ENOSYS; 237 238 return ops->enable(clk); 239 } 240 241 int clk_disable(struct clk *clk) 242 { 243 const struct clk_ops *ops = clk_dev_ops(clk->dev); 244 245 debug("%s(clk=%p)\n", __func__, clk); 246 247 if (!ops->disable) 248 return -ENOSYS; 249 250 return ops->disable(clk); 251 } 252 253 UCLASS_DRIVER(clk) = { 254 .id = UCLASS_CLK, 255 .name = "clk", 256 }; 257