1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. 4 */ 5 6 #include <linux/amba/bus.h> 7 #include <linux/bitfield.h> 8 #include <linux/coresight.h> 9 #include <linux/device.h> 10 #include <linux/err.h> 11 #include <linux/fs.h> 12 #include <linux/io.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 18 #include "coresight-priv.h" 19 #include "coresight-tpda.h" 20 #include "coresight-trace-id.h" 21 22 DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda"); 23 24 /* Settings pre enabling port control register */ 25 static void tpda_enable_pre_port(struct tpda_drvdata *drvdata) 26 { 27 u32 val; 28 29 val = readl_relaxed(drvdata->base + TPDA_CR); 30 val &= ~TPDA_CR_ATID; 31 val |= FIELD_PREP(TPDA_CR_ATID, drvdata->atid); 32 writel_relaxed(val, drvdata->base + TPDA_CR); 33 } 34 35 static void tpda_enable_port(struct tpda_drvdata *drvdata, int port) 36 { 37 u32 val; 38 39 val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port)); 40 /* Enable the port */ 41 val |= TPDA_Pn_CR_ENA; 42 writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port)); 43 } 44 45 static void __tpda_enable(struct tpda_drvdata *drvdata, int port) 46 { 47 CS_UNLOCK(drvdata->base); 48 49 if (!drvdata->csdev->enable) 50 tpda_enable_pre_port(drvdata); 51 52 tpda_enable_port(drvdata, port); 53 54 CS_LOCK(drvdata->base); 55 } 56 57 static int tpda_enable(struct coresight_device *csdev, int inport, int outport) 58 { 59 struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 60 61 spin_lock(&drvdata->spinlock); 62 if (atomic_read(&csdev->refcnt[inport]) == 0) 63 __tpda_enable(drvdata, inport); 64 65 atomic_inc(&csdev->refcnt[inport]); 66 spin_unlock(&drvdata->spinlock); 67 68 dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", inport); 69 return 0; 70 } 71 72 static void __tpda_disable(struct tpda_drvdata *drvdata, int port) 73 { 74 u32 val; 75 76 CS_UNLOCK(drvdata->base); 77 78 val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port)); 79 val &= ~TPDA_Pn_CR_ENA; 80 writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port)); 81 82 CS_LOCK(drvdata->base); 83 } 84 85 static void tpda_disable(struct coresight_device *csdev, int inport, 86 int outport) 87 { 88 struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 89 90 spin_lock(&drvdata->spinlock); 91 if (atomic_dec_return(&csdev->refcnt[inport]) == 0) 92 __tpda_disable(drvdata, inport); 93 94 spin_unlock(&drvdata->spinlock); 95 96 dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", inport); 97 } 98 99 static const struct coresight_ops_link tpda_link_ops = { 100 .enable = tpda_enable, 101 .disable = tpda_disable, 102 }; 103 104 static const struct coresight_ops tpda_cs_ops = { 105 .link_ops = &tpda_link_ops, 106 }; 107 108 static int tpda_init_default_data(struct tpda_drvdata *drvdata) 109 { 110 int atid; 111 /* 112 * TPDA must has a unique atid. This atid can uniquely 113 * identify the TPDM trace source connected to the TPDA. 114 * The TPDMs which are connected to same TPDA share the 115 * same trace-id. When TPDA does packetization, different 116 * port will have unique channel number for decoding. 117 */ 118 atid = coresight_trace_id_get_system_id(); 119 if (atid < 0) 120 return atid; 121 122 drvdata->atid = atid; 123 return 0; 124 } 125 126 static int tpda_probe(struct amba_device *adev, const struct amba_id *id) 127 { 128 int ret; 129 struct device *dev = &adev->dev; 130 struct coresight_platform_data *pdata; 131 struct tpda_drvdata *drvdata; 132 struct coresight_desc desc = { 0 }; 133 void __iomem *base; 134 135 pdata = coresight_get_platform_data(dev); 136 if (IS_ERR(pdata)) 137 return PTR_ERR(pdata); 138 adev->dev.platform_data = pdata; 139 140 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 141 if (!drvdata) 142 return -ENOMEM; 143 144 drvdata->dev = &adev->dev; 145 dev_set_drvdata(dev, drvdata); 146 147 base = devm_ioremap_resource(dev, &adev->res); 148 if (IS_ERR(base)) 149 return PTR_ERR(base); 150 drvdata->base = base; 151 152 spin_lock_init(&drvdata->spinlock); 153 154 ret = tpda_init_default_data(drvdata); 155 if (ret) 156 return ret; 157 158 desc.name = coresight_alloc_device_name(&tpda_devs, dev); 159 if (!desc.name) 160 return -ENOMEM; 161 desc.type = CORESIGHT_DEV_TYPE_LINK; 162 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG; 163 desc.ops = &tpda_cs_ops; 164 desc.pdata = adev->dev.platform_data; 165 desc.dev = &adev->dev; 166 desc.access = CSDEV_ACCESS_IOMEM(base); 167 drvdata->csdev = coresight_register(&desc); 168 if (IS_ERR(drvdata->csdev)) 169 return PTR_ERR(drvdata->csdev); 170 171 pm_runtime_put(&adev->dev); 172 173 dev_dbg(drvdata->dev, "TPDA initialized\n"); 174 return 0; 175 } 176 177 static void tpda_remove(struct amba_device *adev) 178 { 179 struct tpda_drvdata *drvdata = dev_get_drvdata(&adev->dev); 180 181 coresight_trace_id_put_system_id(drvdata->atid); 182 coresight_unregister(drvdata->csdev); 183 } 184 185 /* 186 * Different TPDA has different periph id. 187 * The difference is 0-7 bits' value. So ignore 0-7 bits. 188 */ 189 static struct amba_id tpda_ids[] = { 190 { 191 .id = 0x000f0f00, 192 .mask = 0x000fff00, 193 }, 194 { 0, 0}, 195 }; 196 197 static struct amba_driver tpda_driver = { 198 .drv = { 199 .name = "coresight-tpda", 200 .owner = THIS_MODULE, 201 .suppress_bind_attrs = true, 202 }, 203 .probe = tpda_probe, 204 .remove = tpda_remove, 205 .id_table = tpda_ids, 206 }; 207 208 module_amba_driver(tpda_driver); 209 210 MODULE_LICENSE("GPL"); 211 MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Aggregator driver"); 212