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 <errno.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 static inline struct clk_ops *clk_dev_ops(struct udevice *dev) 18 { 19 return (struct clk_ops *)dev->driver->ops; 20 } 21 22 #if CONFIG_IS_ENABLED(OF_CONTROL) 23 #ifdef CONFIG_SPL_BUILD 24 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) 25 { 26 int ret; 27 u32 cell[2]; 28 29 if (index != 0) 30 return -ENOSYS; 31 assert(clk); 32 ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev); 33 if (ret) 34 return ret; 35 ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clocks", 36 cell, 2); 37 if (ret) 38 return ret; 39 clk->id = cell[1]; 40 return 0; 41 } 42 43 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) 44 { 45 return -ENOSYS; 46 } 47 #else 48 static int clk_of_xlate_default(struct clk *clk, 49 struct fdtdec_phandle_args *args) 50 { 51 debug("%s(clk=%p)\n", __func__, clk); 52 53 if (args->args_count > 1) { 54 debug("Invaild args_count: %d\n", args->args_count); 55 return -EINVAL; 56 } 57 58 if (args->args_count) 59 clk->id = args->args[0]; 60 else 61 clk->id = 0; 62 63 return 0; 64 } 65 66 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) 67 { 68 int ret; 69 struct fdtdec_phandle_args args; 70 struct udevice *dev_clk; 71 struct clk_ops *ops; 72 73 debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk); 74 75 assert(clk); 76 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, 77 "clocks", "#clock-cells", 0, index, 78 &args); 79 if (ret) { 80 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n", 81 __func__, ret); 82 return ret; 83 } 84 85 ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node, &dev_clk); 86 if (ret) { 87 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n", 88 __func__, ret); 89 return ret; 90 } 91 ops = clk_dev_ops(dev_clk); 92 93 if (ops->of_xlate) 94 ret = ops->of_xlate(clk, &args); 95 else 96 ret = clk_of_xlate_default(clk, &args); 97 if (ret) { 98 debug("of_xlate() failed: %d\n", ret); 99 return ret; 100 } 101 102 return clk_request(dev_clk, clk); 103 } 104 105 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) 106 { 107 int index; 108 109 debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk); 110 111 index = fdt_find_string(gd->fdt_blob, dev->of_offset, "clock-names", 112 name); 113 if (index < 0) { 114 debug("fdt_find_string() failed: %d\n", index); 115 return index; 116 } 117 118 return clk_get_by_index(dev, index, clk); 119 } 120 #endif 121 #endif 122 123 int clk_request(struct udevice *dev, struct clk *clk) 124 { 125 struct clk_ops *ops = clk_dev_ops(dev); 126 127 debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); 128 129 clk->dev = dev; 130 131 if (!ops->request) 132 return 0; 133 134 return ops->request(clk); 135 } 136 137 int clk_free(struct clk *clk) 138 { 139 struct clk_ops *ops = clk_dev_ops(clk->dev); 140 141 debug("%s(clk=%p)\n", __func__, clk); 142 143 if (!ops->free) 144 return 0; 145 146 return ops->free(clk); 147 } 148 149 ulong clk_get_rate(struct clk *clk) 150 { 151 struct clk_ops *ops = clk_dev_ops(clk->dev); 152 153 debug("%s(clk=%p)\n", __func__, clk); 154 155 if (!ops->get_rate) 156 return -ENOSYS; 157 158 return ops->get_rate(clk); 159 } 160 161 ulong clk_set_rate(struct clk *clk, ulong rate) 162 { 163 struct clk_ops *ops = clk_dev_ops(clk->dev); 164 165 debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); 166 167 if (!ops->set_rate) 168 return -ENOSYS; 169 170 return ops->set_rate(clk, rate); 171 } 172 173 int clk_enable(struct clk *clk) 174 { 175 struct clk_ops *ops = clk_dev_ops(clk->dev); 176 177 debug("%s(clk=%p)\n", __func__, clk); 178 179 if (!ops->enable) 180 return -ENOSYS; 181 182 return ops->enable(clk); 183 } 184 185 int clk_disable(struct clk *clk) 186 { 187 struct clk_ops *ops = clk_dev_ops(clk->dev); 188 189 debug("%s(clk=%p)\n", __func__, clk); 190 191 if (!ops->disable) 192 return -ENOSYS; 193 194 return ops->disable(clk); 195 } 196 197 UCLASS_DRIVER(clk) = { 198 .id = UCLASS_CLK, 199 .name = "clk", 200 }; 201