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 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) 57 { 58 int ret; 59 struct ofnode_phandle_args args; 60 struct udevice *dev_clk; 61 const struct clk_ops *ops; 62 63 debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk); 64 65 assert(clk); 66 clk->dev = NULL; 67 68 ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0, 69 index, &args); 70 if (ret) { 71 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n", 72 __func__, ret); 73 return ret; 74 } 75 76 ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk); 77 if (ret) { 78 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n", 79 __func__, ret); 80 return ret; 81 } 82 83 clk->dev = dev_clk; 84 85 ops = clk_dev_ops(dev_clk); 86 87 if (ops->of_xlate) 88 ret = ops->of_xlate(clk, &args); 89 else 90 ret = clk_of_xlate_default(clk, &args); 91 if (ret) { 92 debug("of_xlate() failed: %d\n", ret); 93 return ret; 94 } 95 96 return clk_request(dev_clk, clk); 97 } 98 # endif /* OF_PLATDATA */ 99 100 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) 101 { 102 int index; 103 104 debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk); 105 clk->dev = NULL; 106 107 index = dev_read_stringlist_search(dev, "clock-names", name); 108 if (index < 0) { 109 debug("fdt_stringlist_search() failed: %d\n", index); 110 return index; 111 } 112 113 return clk_get_by_index(dev, index, clk); 114 } 115 116 int clk_release_all(struct clk *clk, int count) 117 { 118 int i, ret; 119 120 for (i = 0; i < count; i++) { 121 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]); 122 123 /* check if clock has been previously requested */ 124 if (!clk[i].dev) 125 continue; 126 127 ret = clk_disable(&clk[i]); 128 if (ret && ret != -ENOSYS) 129 return ret; 130 131 ret = clk_free(&clk[i]); 132 if (ret && ret != -ENOSYS) 133 return ret; 134 } 135 136 return 0; 137 } 138 139 #endif /* OF_CONTROL */ 140 141 int clk_request(struct udevice *dev, struct clk *clk) 142 { 143 const struct clk_ops *ops = clk_dev_ops(dev); 144 145 debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); 146 147 clk->dev = dev; 148 149 if (!ops->request) 150 return 0; 151 152 return ops->request(clk); 153 } 154 155 int clk_free(struct clk *clk) 156 { 157 const struct clk_ops *ops = clk_dev_ops(clk->dev); 158 159 debug("%s(clk=%p)\n", __func__, clk); 160 161 if (!ops->free) 162 return 0; 163 164 return ops->free(clk); 165 } 166 167 ulong clk_get_rate(struct clk *clk) 168 { 169 const struct clk_ops *ops = clk_dev_ops(clk->dev); 170 171 debug("%s(clk=%p)\n", __func__, clk); 172 173 if (!ops->get_rate) 174 return -ENOSYS; 175 176 return ops->get_rate(clk); 177 } 178 179 ulong clk_set_rate(struct clk *clk, ulong rate) 180 { 181 const struct clk_ops *ops = clk_dev_ops(clk->dev); 182 183 debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); 184 185 if (!ops->set_rate) 186 return -ENOSYS; 187 188 return ops->set_rate(clk, rate); 189 } 190 191 int clk_enable(struct clk *clk) 192 { 193 const struct clk_ops *ops = clk_dev_ops(clk->dev); 194 195 debug("%s(clk=%p)\n", __func__, clk); 196 197 if (!ops->enable) 198 return -ENOSYS; 199 200 return ops->enable(clk); 201 } 202 203 int clk_disable(struct clk *clk) 204 { 205 const struct clk_ops *ops = clk_dev_ops(clk->dev); 206 207 debug("%s(clk=%p)\n", __func__, clk); 208 209 if (!ops->disable) 210 return -ENOSYS; 211 212 return ops->disable(clk); 213 } 214 215 UCLASS_DRIVER(clk) = { 216 .id = UCLASS_CLK, 217 .name = "clk", 218 }; 219