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/init.h> 16 #include <linux/device.h> 17 #include <linux/platform_device.h> 18 #include <linux/io.h> 19 #include <linux/err.h> 20 #include <linux/slab.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/clk.h> 23 #include <linux/of.h> 24 #include <linux/coresight.h> 25 26 #include "coresight-priv.h" 27 28 /** 29 * struct replicator_drvdata - specifics associated to a replicator component 30 * @dev: the device entity associated with this component 31 * @atclk: optional clock for the core parts of the replicator. 32 * @csdev: component vitals needed by the framework 33 */ 34 struct replicator_drvdata { 35 struct device *dev; 36 struct clk *atclk; 37 struct coresight_device *csdev; 38 }; 39 40 static int replicator_enable(struct coresight_device *csdev, int inport, 41 int outport) 42 { 43 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 44 45 pm_runtime_get_sync(drvdata->dev); 46 dev_info(drvdata->dev, "REPLICATOR enabled\n"); 47 return 0; 48 } 49 50 static void replicator_disable(struct coresight_device *csdev, int inport, 51 int outport) 52 { 53 struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 54 55 pm_runtime_put(drvdata->dev); 56 dev_info(drvdata->dev, "REPLICATOR disabled\n"); 57 } 58 59 static const struct coresight_ops_link replicator_link_ops = { 60 .enable = replicator_enable, 61 .disable = replicator_disable, 62 }; 63 64 static const struct coresight_ops replicator_cs_ops = { 65 .link_ops = &replicator_link_ops, 66 }; 67 68 static int replicator_probe(struct platform_device *pdev) 69 { 70 int ret; 71 struct device *dev = &pdev->dev; 72 struct coresight_platform_data *pdata = NULL; 73 struct replicator_drvdata *drvdata; 74 struct coresight_desc *desc; 75 struct device_node *np = pdev->dev.of_node; 76 77 if (np) { 78 pdata = of_get_coresight_platform_data(dev, np); 79 if (IS_ERR(pdata)) 80 return PTR_ERR(pdata); 81 pdev->dev.platform_data = pdata; 82 } 83 84 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 85 if (!drvdata) 86 return -ENOMEM; 87 88 drvdata->dev = &pdev->dev; 89 drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */ 90 if (!IS_ERR(drvdata->atclk)) { 91 ret = clk_prepare_enable(drvdata->atclk); 92 if (ret) 93 return ret; 94 } 95 pm_runtime_get_noresume(&pdev->dev); 96 pm_runtime_set_active(&pdev->dev); 97 pm_runtime_enable(&pdev->dev); 98 platform_set_drvdata(pdev, drvdata); 99 100 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); 101 if (!desc) { 102 ret = -ENOMEM; 103 goto out_disable_pm; 104 } 105 106 desc->type = CORESIGHT_DEV_TYPE_LINK; 107 desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; 108 desc->ops = &replicator_cs_ops; 109 desc->pdata = pdev->dev.platform_data; 110 desc->dev = &pdev->dev; 111 drvdata->csdev = coresight_register(desc); 112 if (IS_ERR(drvdata->csdev)) { 113 ret = PTR_ERR(drvdata->csdev); 114 goto out_disable_pm; 115 } 116 117 pm_runtime_put(&pdev->dev); 118 119 dev_info(dev, "REPLICATOR initialized\n"); 120 return 0; 121 122 out_disable_pm: 123 if (!IS_ERR(drvdata->atclk)) 124 clk_disable_unprepare(drvdata->atclk); 125 pm_runtime_put_noidle(&pdev->dev); 126 pm_runtime_disable(&pdev->dev); 127 128 return ret; 129 } 130 131 static int replicator_remove(struct platform_device *pdev) 132 { 133 struct replicator_drvdata *drvdata = platform_get_drvdata(pdev); 134 135 coresight_unregister(drvdata->csdev); 136 pm_runtime_get_sync(&pdev->dev); 137 if (!IS_ERR(drvdata->atclk)) 138 clk_disable_unprepare(drvdata->atclk); 139 pm_runtime_put_noidle(&pdev->dev); 140 pm_runtime_disable(&pdev->dev); 141 142 return 0; 143 } 144 145 #ifdef CONFIG_PM 146 static int replicator_runtime_suspend(struct device *dev) 147 { 148 struct replicator_drvdata *drvdata = dev_get_drvdata(dev); 149 150 if (drvdata && !IS_ERR(drvdata->atclk)) 151 clk_disable_unprepare(drvdata->atclk); 152 153 return 0; 154 } 155 156 static int replicator_runtime_resume(struct device *dev) 157 { 158 struct replicator_drvdata *drvdata = dev_get_drvdata(dev); 159 160 if (drvdata && !IS_ERR(drvdata->atclk)) 161 clk_prepare_enable(drvdata->atclk); 162 163 return 0; 164 } 165 #endif 166 167 static const struct dev_pm_ops replicator_dev_pm_ops = { 168 SET_RUNTIME_PM_OPS(replicator_runtime_suspend, 169 replicator_runtime_resume, NULL) 170 }; 171 172 static const struct of_device_id replicator_match[] = { 173 {.compatible = "arm,coresight-replicator"}, 174 {} 175 }; 176 177 static struct platform_driver replicator_driver = { 178 .probe = replicator_probe, 179 .remove = replicator_remove, 180 .driver = { 181 .name = "coresight-replicator", 182 .of_match_table = replicator_match, 183 .pm = &replicator_dev_pm_ops, 184 }, 185 }; 186 187 static int __init replicator_init(void) 188 { 189 return platform_driver_register(&replicator_driver); 190 } 191 module_init(replicator_init); 192 193 static void __exit replicator_exit(void) 194 { 195 platform_driver_unregister(&replicator_driver); 196 } 197 module_exit(replicator_exit); 198 199 MODULE_LICENSE("GPL v2"); 200 MODULE_DESCRIPTION("CoreSight Replicator driver"); 201