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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 | /* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2023, Linaro Ltd. */ #include <linux/clk.h> #include <linux/device.h> #include <linux/interconnect-clk.h> #include <linux/interconnect-provider.h> struct icc_clk_node { struct clk *clk; bool enabled; }; struct icc_clk_provider { struct icc_provider provider; int num_clocks; struct icc_clk_node clocks[] __counted_by(num_clocks); }; #define to_icc_clk_provider(_provider) \ container_of(_provider, struct icc_clk_provider, provider) static int icc_clk_set(struct icc_node *src, struct icc_node *dst) { struct icc_clk_node *qn = src->data; int ret; if (!qn || !qn->clk) return 0; if (!src->peak_bw) { if (qn->enabled) clk_disable_unprepare(qn->clk); qn->enabled = false; return 0; } if (!qn->enabled) { ret = clk_prepare_enable(qn->clk); if (ret) return ret; qn->enabled = true; } return clk_set_rate(qn->clk, icc_units_to_bps(src->peak_bw)); } static int icc_clk_get_bw(struct icc_node *node, u32 *avg, u32 *peak) { struct icc_clk_node *qn = node->data; if (!qn || !qn->clk) *peak = INT_MAX; else *peak = Bps_to_icc(clk_get_rate(qn->clk)); return 0; } /** * icc_clk_register() - register a new clk-based interconnect provider * @dev: device supporting this provider * @first_id: an ID of the first provider's node * @num_clocks: number of instances of struct icc_clk_data * @data: data for the provider * * Registers and returns a clk-based interconnect provider. It is a simple * wrapper around COMMON_CLK framework, allowing other devices to vote on the * clock rate. * * Return: 0 on success, or an error code otherwise */ struct icc_provider *icc_clk_register(struct device *dev, unsigned int first_id, unsigned int num_clocks, const struct icc_clk_data *data) { struct icc_clk_provider *qp; struct icc_provider *provider; struct icc_onecell_data *onecell; struct icc_node *node; int ret, i, j; onecell = devm_kzalloc(dev, struct_size(onecell, nodes, 2 * num_clocks), GFP_KERNEL); if (!onecell) return ERR_PTR(-ENOMEM); qp = devm_kzalloc(dev, struct_size(qp, clocks, num_clocks), GFP_KERNEL); if (!qp) return ERR_PTR(-ENOMEM); qp->num_clocks = num_clocks; provider = &qp->provider; provider->dev = dev; provider->get_bw = icc_clk_get_bw; provider->set = icc_clk_set; provider->aggregate = icc_std_aggregate; provider->xlate = of_icc_xlate_onecell; INIT_LIST_HEAD(&provider->nodes); provider->data = onecell; icc_provider_init(provider); for (i = 0, j = 0; i < num_clocks; i++) { qp->clocks[i].clk = data[i].clk; node = icc_node_create(first_id + j); if (IS_ERR(node)) { ret = PTR_ERR(node); goto err; } node->name = devm_kasprintf(dev, GFP_KERNEL, "%s_master", data[i].name); node->data = &qp->clocks[i]; icc_node_add(node, provider); /* link to the next node, slave */ icc_link_create(node, first_id + j + 1); onecell->nodes[j++] = node; node = icc_node_create(first_id + j); if (IS_ERR(node)) { ret = PTR_ERR(node); goto err; } node->name = devm_kasprintf(dev, GFP_KERNEL, "%s_slave", data[i].name); /* no data for slave node */ icc_node_add(node, provider); onecell->nodes[j++] = node; } onecell->num_nodes = j; ret = icc_provider_register(provider); if (ret) goto err; return provider; err: icc_nodes_remove(provider); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(icc_clk_register); /** * icc_clk_unregister() - unregister a previously registered clk interconnect provider * @provider: provider returned by icc_clk_register() */ void icc_clk_unregister(struct icc_provider *provider) { struct icc_clk_provider *qp = container_of(provider, struct icc_clk_provider, provider); int i; icc_provider_deregister(&qp->provider); icc_nodes_remove(&qp->provider); for (i = 0; i < qp->num_clocks; i++) { struct icc_clk_node *qn = &qp->clocks[i]; if (qn->enabled) clk_disable_unprepare(qn->clk); } } EXPORT_SYMBOL_GPL(icc_clk_unregister); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Interconnect wrapper for clocks"); MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>"); |