1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved. 2 * 3 * Description: CoreSight Replicator driver 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 and 7 * only version 2 as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/kernel.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 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 dev_info(drvdata->dev, "REPLICATOR disabled\n"); 55 } 56 57 static const struct coresight_ops_link replicator_link_ops = { 58 .enable = replicator_enable, 59 .disable = replicator_disable, 60 }; 61 62 static const struct coresight_ops replicator_cs_ops = { 63 .link_ops = &replicator_link_ops, 64 }; 65 66 static int replicator_probe(struct platform_device *pdev) 67 { 68 int ret; 69 struct device *dev = &pdev->dev; 70 struct coresight_platform_data *pdata = NULL; 71 struct replicator_drvdata *drvdata; 72 struct coresight_desc desc = { 0 }; 73 struct device_node *np = pdev->dev.of_node; 74 75 if (np) { 76 pdata = of_get_coresight_platform_data(dev, np); 77 if (IS_ERR(pdata)) 78 return PTR_ERR(pdata); 79 pdev->dev.platform_data = pdata; 80 } 81 82 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 83 if (!drvdata) 84 return -ENOMEM; 85 86 drvdata->dev = &pdev->dev; 87 drvdata->atclk = devm_clk_get(&pdev->dev, "atclk"); /* optional */ 88 if (!IS_ERR(drvdata->atclk)) { 89 ret = clk_prepare_enable(drvdata->atclk); 90 if (ret) 91 return ret; 92 } 93 pm_runtime_get_noresume(&pdev->dev); 94 pm_runtime_set_active(&pdev->dev); 95 pm_runtime_enable(&pdev->dev); 96 platform_set_drvdata(pdev, drvdata); 97 98 desc.type = CORESIGHT_DEV_TYPE_LINK; 99 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; 100 desc.ops = &replicator_cs_ops; 101 desc.pdata = pdev->dev.platform_data; 102 desc.dev = &pdev->dev; 103 drvdata->csdev = coresight_register(&desc); 104 if (IS_ERR(drvdata->csdev)) { 105 ret = PTR_ERR(drvdata->csdev); 106 goto out_disable_pm; 107 } 108 109 pm_runtime_put(&pdev->dev); 110 111 return 0; 112 113 out_disable_pm: 114 if (!IS_ERR(drvdata->atclk)) 115 clk_disable_unprepare(drvdata->atclk); 116 pm_runtime_put_noidle(&pdev->dev); 117 pm_runtime_disable(&pdev->dev); 118 119 return ret; 120 } 121 122 #ifdef CONFIG_PM 123 static int replicator_runtime_suspend(struct device *dev) 124 { 125 struct replicator_drvdata *drvdata = dev_get_drvdata(dev); 126 127 if (drvdata && !IS_ERR(drvdata->atclk)) 128 clk_disable_unprepare(drvdata->atclk); 129 130 return 0; 131 } 132 133 static int replicator_runtime_resume(struct device *dev) 134 { 135 struct replicator_drvdata *drvdata = dev_get_drvdata(dev); 136 137 if (drvdata && !IS_ERR(drvdata->atclk)) 138 clk_prepare_enable(drvdata->atclk); 139 140 return 0; 141 } 142 #endif 143 144 static const struct dev_pm_ops replicator_dev_pm_ops = { 145 SET_RUNTIME_PM_OPS(replicator_runtime_suspend, 146 replicator_runtime_resume, NULL) 147 }; 148 149 static const struct of_device_id replicator_match[] = { 150 {.compatible = "arm,coresight-replicator"}, 151 {} 152 }; 153 154 static struct platform_driver replicator_driver = { 155 .probe = replicator_probe, 156 .driver = { 157 .name = "coresight-replicator", 158 .of_match_table = replicator_match, 159 .pm = &replicator_dev_pm_ops, 160 .suppress_bind_attrs = true, 161 }, 162 }; 163 builtin_platform_driver(replicator_driver); 164