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 fdtdec_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 fdtdec_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 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset, 69 "clocks", "#clock-cells", 0, index, 70 &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_of_offset(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 ops = clk_dev_ops(dev_clk); 84 85 if (ops->of_xlate) 86 ret = ops->of_xlate(clk, &args); 87 else 88 ret = clk_of_xlate_default(clk, &args); 89 if (ret) { 90 debug("of_xlate() failed: %d\n", ret); 91 return ret; 92 } 93 94 return clk_request(dev_clk, clk); 95 } 96 # endif /* OF_PLATDATA */ 97 98 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) 99 { 100 int index; 101 102 debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk); 103 104 index = fdt_find_string(gd->fdt_blob, dev->of_offset, "clock-names", 105 name); 106 if (index < 0) { 107 debug("fdt_find_string() failed: %d\n", index); 108 return index; 109 } 110 111 return clk_get_by_index(dev, index, clk); 112 } 113 #endif /* OF_CONTROL */ 114 115 int clk_request(struct udevice *dev, struct clk *clk) 116 { 117 struct clk_ops *ops = clk_dev_ops(dev); 118 119 debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); 120 121 clk->dev = dev; 122 123 if (!ops->request) 124 return 0; 125 126 return ops->request(clk); 127 } 128 129 int clk_free(struct clk *clk) 130 { 131 struct clk_ops *ops = clk_dev_ops(clk->dev); 132 133 debug("%s(clk=%p)\n", __func__, clk); 134 135 if (!ops->free) 136 return 0; 137 138 return ops->free(clk); 139 } 140 141 ulong clk_get_rate(struct clk *clk) 142 { 143 struct clk_ops *ops = clk_dev_ops(clk->dev); 144 145 debug("%s(clk=%p)\n", __func__, clk); 146 147 if (!ops->get_rate) 148 return -ENOSYS; 149 150 return ops->get_rate(clk); 151 } 152 153 ulong clk_set_rate(struct clk *clk, ulong rate) 154 { 155 struct clk_ops *ops = clk_dev_ops(clk->dev); 156 157 debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); 158 159 if (!ops->set_rate) 160 return -ENOSYS; 161 162 return ops->set_rate(clk, rate); 163 } 164 165 int clk_enable(struct clk *clk) 166 { 167 struct clk_ops *ops = clk_dev_ops(clk->dev); 168 169 debug("%s(clk=%p)\n", __func__, clk); 170 171 if (!ops->enable) 172 return -ENOSYS; 173 174 return ops->enable(clk); 175 } 176 177 int clk_disable(struct clk *clk) 178 { 179 struct clk_ops *ops = clk_dev_ops(clk->dev); 180 181 debug("%s(clk=%p)\n", __func__, clk); 182 183 if (!ops->disable) 184 return -ENOSYS; 185 186 return ops->disable(clk); 187 } 188 189 UCLASS_DRIVER(clk) = { 190 .id = UCLASS_CLK, 191 .name = "clk", 192 }; 193