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 DECLARE_GLOBAL_DATA_PTR; 17 18 static inline struct clk_ops *clk_dev_ops(struct udevice *dev) 19 { 20 return (struct clk_ops *)dev->driver->ops; 21 } 22 23 #if CONFIG_IS_ENABLED(OF_CONTROL) 24 # if CONFIG_IS_ENABLED(OF_PLATDATA) 25 int clk_get_by_index_platdata(struct udevice *dev, int index, 26 struct phandle_2_cell *cells, struct clk *clk) 27 { 28 int ret; 29 30 if (index != 0) 31 return -ENOSYS; 32 ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev); 33 if (ret) 34 return ret; 35 clk->id = cells[0].id; 36 37 return 0; 38 } 39 # else 40 static int clk_of_xlate_default(struct clk *clk, 41 struct ofnode_phandle_args *args) 42 { 43 debug("%s(clk=%p)\n", __func__, clk); 44 45 if (args->args_count > 1) { 46 debug("Invaild args_count: %d\n", args->args_count); 47 return -EINVAL; 48 } 49 50 if (args->args_count) 51 clk->id = args->args[0]; 52 else 53 clk->id = 0; 54 55 return 0; 56 } 57 58 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) 59 { 60 int ret; 61 struct ofnode_phandle_args args; 62 struct udevice *dev_clk; 63 struct clk_ops *ops; 64 65 debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk); 66 67 assert(clk); 68 clk->dev = NULL; 69 70 ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0, 71 index, &args); 72 if (ret) { 73 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n", 74 __func__, ret); 75 return ret; 76 } 77 78 ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk); 79 if (ret) { 80 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n", 81 __func__, ret); 82 return ret; 83 } 84 85 clk->dev = dev_clk; 86 87 ops = clk_dev_ops(dev_clk); 88 89 if (ops->of_xlate) 90 ret = ops->of_xlate(clk, &args); 91 else 92 ret = clk_of_xlate_default(clk, &args); 93 if (ret) { 94 debug("of_xlate() failed: %d\n", ret); 95 return ret; 96 } 97 98 return clk_request(dev_clk, clk); 99 } 100 # endif /* OF_PLATDATA */ 101 102 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) 103 { 104 int index; 105 106 debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk); 107 clk->dev = NULL; 108 109 index = dev_read_stringlist_search(dev, "clock-names", name); 110 if (index < 0) { 111 debug("fdt_stringlist_search() failed: %d\n", index); 112 return index; 113 } 114 115 return clk_get_by_index(dev, index, clk); 116 } 117 118 int clk_release_all(struct clk *clk, int count) 119 { 120 int i, ret; 121 122 for (i = 0; i < count; i++) { 123 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]); 124 125 /* check if clock has been previously requested */ 126 if (!clk[i].dev) 127 continue; 128 129 ret = clk_disable(&clk[i]); 130 if (ret && ret != -ENOSYS) 131 return ret; 132 133 ret = clk_free(&clk[i]); 134 if (ret && ret != -ENOSYS) 135 return ret; 136 } 137 138 return 0; 139 } 140 141 #endif /* OF_CONTROL */ 142 143 int clk_request(struct udevice *dev, struct clk *clk) 144 { 145 struct clk_ops *ops = clk_dev_ops(dev); 146 147 debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); 148 149 clk->dev = dev; 150 151 if (!ops->request) 152 return 0; 153 154 return ops->request(clk); 155 } 156 157 int clk_free(struct clk *clk) 158 { 159 struct clk_ops *ops = clk_dev_ops(clk->dev); 160 161 debug("%s(clk=%p)\n", __func__, clk); 162 163 if (!ops->free) 164 return 0; 165 166 return ops->free(clk); 167 } 168 169 ulong clk_get_rate(struct clk *clk) 170 { 171 struct clk_ops *ops = clk_dev_ops(clk->dev); 172 173 debug("%s(clk=%p)\n", __func__, clk); 174 175 if (!ops->get_rate) 176 return -ENOSYS; 177 178 return ops->get_rate(clk); 179 } 180 181 ulong clk_set_rate(struct clk *clk, ulong rate) 182 { 183 struct clk_ops *ops = clk_dev_ops(clk->dev); 184 185 debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); 186 187 if (!ops->set_rate) 188 return -ENOSYS; 189 190 return ops->set_rate(clk, rate); 191 } 192 193 int clk_enable(struct clk *clk) 194 { 195 struct clk_ops *ops = clk_dev_ops(clk->dev); 196 197 debug("%s(clk=%p)\n", __func__, clk); 198 199 if (!ops->enable) 200 return -ENOSYS; 201 202 return ops->enable(clk); 203 } 204 205 int clk_disable(struct clk *clk) 206 { 207 struct clk_ops *ops = clk_dev_ops(clk->dev); 208 209 debug("%s(clk=%p)\n", __func__, clk); 210 211 if (!ops->disable) 212 return -ENOSYS; 213 214 return ops->disable(clk); 215 } 216 217 UCLASS_DRIVER(clk) = { 218 .id = UCLASS_CLK, 219 .name = "clk", 220 }; 221