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 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); 105 106 index = dev_read_stringlist_search(dev, "clock-names", name); 107 if (index < 0) { 108 debug("fdt_stringlist_search() failed: %d\n", index); 109 return index; 110 } 111 112 return clk_get_by_index(dev, index, clk); 113 } 114 #endif /* OF_CONTROL */ 115 116 int clk_request(struct udevice *dev, struct clk *clk) 117 { 118 struct clk_ops *ops = clk_dev_ops(dev); 119 120 debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); 121 122 clk->dev = dev; 123 124 if (!ops->request) 125 return 0; 126 127 return ops->request(clk); 128 } 129 130 int clk_free(struct clk *clk) 131 { 132 struct clk_ops *ops = clk_dev_ops(clk->dev); 133 134 debug("%s(clk=%p)\n", __func__, clk); 135 136 if (!ops->free) 137 return 0; 138 139 return ops->free(clk); 140 } 141 142 ulong clk_get_rate(struct clk *clk) 143 { 144 struct clk_ops *ops = clk_dev_ops(clk->dev); 145 146 debug("%s(clk=%p)\n", __func__, clk); 147 148 if (!ops->get_rate) 149 return -ENOSYS; 150 151 return ops->get_rate(clk); 152 } 153 154 ulong clk_set_rate(struct clk *clk, ulong rate) 155 { 156 struct clk_ops *ops = clk_dev_ops(clk->dev); 157 158 debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); 159 160 if (!ops->set_rate) 161 return -ENOSYS; 162 163 return ops->set_rate(clk, rate); 164 } 165 166 int clk_enable(struct clk *clk) 167 { 168 struct clk_ops *ops = clk_dev_ops(clk->dev); 169 170 debug("%s(clk=%p)\n", __func__, clk); 171 172 if (!ops->enable) 173 return -ENOSYS; 174 175 return ops->enable(clk); 176 } 177 178 int clk_disable(struct clk *clk) 179 { 180 struct clk_ops *ops = clk_dev_ops(clk->dev); 181 182 debug("%s(clk=%p)\n", __func__, clk); 183 184 if (!ops->disable) 185 return -ENOSYS; 186 187 return ops->disable(clk); 188 } 189 190 UCLASS_DRIVER(clk) = { 191 .id = UCLASS_CLK, 192 .name = "clk", 193 }; 194