1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. 2 * 3 * This program is free software; you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License version 2 and 5 * only version 2 as published by the Free Software Foundation. 6 * 7 * This program is distributed in the hope that it will be useful, 8 * but WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 * GNU General Public License for more details. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/platform_device.h> 17 #include <linux/io.h> 18 #include <linux/err.h> 19 #include <linux/slab.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/clk.h> 22 #include <linux/of.h> 23 #include <linux/coresight.h> 24 25 #include "coresight-priv.h" 26 27 /** 28 * struct replicator_drvdata - specifics associated to a replicator component 29 * @dev: the device entity associated with this component 30 * @atclk: optional clock for the core parts of the replicator. 31 * @csdev: component vitals needed by the framework 32 */ 33 struct replicator_drvdata { 34 struct device *dev; 35 struct clk *atclk; 36 struct coresight_device *csdev; 37 }; 38 39 static int replicator_enable(struct coresight_device *csdev, int inport, 40 int outport) 41 { 42 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 43 44 pm_runtime_get_sync(drvdata->dev); 45 dev_info(drvdata->dev, "REPLICATOR enabled\n"); 46 return 0; 47 } 48 49 static void replicator_disable(struct coresight_device *csdev, int inport, 50 int outport) 51 { 52 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 53 54 pm_runtime_put(drvdata->dev); 55 dev_info(drvdata->dev, "REPLICATOR disabled\n"); 56 } 57 58 static const struct coresight_ops_link replicator_link_ops = { 59 .enable = replicator_enable, 60 .disable = replicator_disable, 61 }; 62 63 static const struct coresight_ops replicator_cs_ops = { 64 .link_ops = &replicator_link_ops, 65 }; 66 67 static int replicator_probe(struct platform_device *pdev) 68 { 69 int ret; 70 struct device *dev = &pdev->dev; 71 struct coresight_platform_data *pdata = NULL; 72 struct replicator_drvdata *drvdata; 73 struct coresight_desc *desc; 74 struct device_node *np = pdev->dev.of_node; 75 76 if (np) { 77 pdata = of_get_coresight_platform_data(dev, np); 78 if (IS_ERR(pdata)) 79 return PTR_ERR(pdata); 80 pdev->dev.platform_data = pdata; 81 } 82 83 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 84 if (!drvdata) 85 return -ENOMEM; 86 87 drvdata->dev = &pdev->dev; 88 drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */ 89 if (!IS_ERR(drvdata->atclk)) { 90 ret = clk_prepare_enable(drvdata->atclk); 91 if (ret) 92 return ret; 93 } 94 pm_runtime_get_noresume(&pdev->dev); 95 pm_runtime_set_active(&pdev->dev); 96 pm_runtime_enable(&pdev->dev); 97 platform_set_drvdata(pdev, drvdata); 98 99 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); 100 if (!desc) { 101 ret = -ENOMEM; 102 goto out_disable_pm; 103 } 104 105 desc->type = CORESIGHT_DEV_TYPE_LINK; 106 desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; 107 desc->ops = &replicator_cs_ops; 108 desc->pdata = pdev->dev.platform_data; 109 desc->dev = &pdev->dev; 110 drvdata->csdev = coresight_register(desc); 111 if (IS_ERR(drvdata->csdev)) { 112 ret = PTR_ERR(drvdata->csdev); 113 goto out_disable_pm; 114 } 115 116 pm_runtime_put(&pdev->dev); 117 118 dev_info(dev, "REPLICATOR initialized\n"); 119 return 0; 120 121 out_disable_pm: 122 if (!IS_ERR(drvdata->atclk)) 123 clk_disable_unprepare(drvdata->atclk); 124 pm_runtime_put_noidle(&pdev->dev); 125 pm_runtime_disable(&pdev->dev); 126 127 return ret; 128 } 129 130 static int replicator_remove(struct platform_device *pdev) 131 { 132 struct replicator_drvdata *drvdata = platform_get_drvdata(pdev); 133 134 coresight_unregister(drvdata->csdev); 135 pm_runtime_get_sync(&pdev->dev); 136 if (!IS_ERR(drvdata->atclk)) 137 clk_disable_unprepare(drvdata->atclk); 138 pm_runtime_put_noidle(&pdev->dev); 139 pm_runtime_disable(&pdev->dev); 140 141 return 0; 142 } 143 144 #ifdef CONFIG_PM 145 static int replicator_runtime_suspend(struct device *dev) 146 { 147 struct replicator_drvdata *drvdata = dev_get_drvdata(dev); 148 149 if (drvdata && !IS_ERR(drvdata->atclk)) 150 clk_disable_unprepare(drvdata->atclk); 151 152 return 0; 153 } 154 155 static int replicator_runtime_resume(struct device *dev) 156 { 157 struct replicator_drvdata *drvdata = dev_get_drvdata(dev); 158 159 if (drvdata && !IS_ERR(drvdata->atclk)) 160 clk_prepare_enable(drvdata->atclk); 161 162 return 0; 163 } 164 #endif 165 166 static const struct dev_pm_ops replicator_dev_pm_ops = { 167 SET_RUNTIME_PM_OPS(replicator_runtime_suspend, 168 replicator_runtime_resume, NULL) 169 }; 170 171 static const struct of_device_id replicator_match[] = { 172 {.compatible = "arm,coresight-replicator"}, 173 {} 174 }; 175 176 static struct platform_driver replicator_driver = { 177 .probe = replicator_probe, 178 .remove = replicator_remove, 179 .driver = { 180 .name = "coresight-replicator", 181 .of_match_table = replicator_match, 182 .pm = &replicator_dev_pm_ops, 183 }, 184 }; 185 186 builtin_platform_driver(replicator_driver); 187 188 MODULE_LICENSE("GPL v2"); 189 MODULE_DESCRIPTION("CoreSight Replicator driver"); 190