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 #include "coresight-tpdm.h" 22 23 DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda"); 24 25 static bool coresight_device_is_tpdm(struct coresight_device *csdev) 26 { 27 return (csdev->type == CORESIGHT_DEV_TYPE_SOURCE) && 28 (csdev->subtype.source_subtype == 29 CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM); 30 } 31 32 static void tpda_clear_element_size(struct coresight_device *csdev) 33 { 34 struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 35 36 drvdata->dsb_esize = 0; 37 drvdata->cmb_esize = 0; 38 } 39 40 static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32 *val) 41 { 42 /* Clear all relevant fields */ 43 *val &= ~(TPDA_Pn_CR_DSBSIZE | TPDA_Pn_CR_CMBSIZE); 44 45 if (drvdata->dsb_esize == 64) 46 *val |= TPDA_Pn_CR_DSBSIZE; 47 else if (drvdata->dsb_esize == 32) 48 *val &= ~TPDA_Pn_CR_DSBSIZE; 49 50 if (drvdata->cmb_esize == 64) 51 *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2); 52 else if (drvdata->cmb_esize == 32) 53 *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1); 54 else if (drvdata->cmb_esize == 8) 55 *val &= ~TPDA_Pn_CR_CMBSIZE; 56 } 57 58 /* 59 * Read the element size from the TPDM device. One TPDM must have at least one of the 60 * element size property. 61 * Returns 62 * 0 - The element size property is read 63 * Others - Cannot read the property of the element size 64 */ 65 static int tpdm_read_element_size(struct tpda_drvdata *drvdata, 66 struct coresight_device *csdev) 67 { 68 int rc = -EINVAL; 69 struct tpdm_drvdata *tpdm_data = dev_get_drvdata(csdev->dev.parent); 70 71 if (tpdm_has_dsb_dataset(tpdm_data)) { 72 rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent), 73 "qcom,dsb-element-bits", &drvdata->dsb_esize); 74 } 75 if (tpdm_has_cmb_dataset(tpdm_data)) { 76 rc = fwnode_property_read_u32(dev_fwnode(csdev->dev.parent), 77 "qcom,cmb-element-bits", &drvdata->cmb_esize); 78 } 79 80 if (rc) 81 dev_warn_once(&csdev->dev, 82 "Failed to read TPDM Element size: %d\n", rc); 83 84 return rc; 85 } 86 87 /* 88 * Search and read element data size from the TPDM node in 89 * the devicetree. Each input port of TPDA is connected to 90 * a TPDM. Different TPDM supports different types of dataset, 91 * and some may support more than one type of dataset. 92 * Parameter "inport" is used to pass in the input port number 93 * of TPDA, and it is set to -1 in the recursize call. 94 */ 95 static int tpda_get_element_size(struct tpda_drvdata *drvdata, 96 struct coresight_device *csdev, 97 int inport) 98 { 99 int rc = 0; 100 int i; 101 struct coresight_device *in; 102 103 for (i = 0; i < csdev->pdata->nr_inconns; i++) { 104 in = csdev->pdata->in_conns[i]->src_dev; 105 if (!in) 106 continue; 107 108 /* Ignore the paths that do not match port */ 109 if (inport >= 0 && 110 csdev->pdata->in_conns[i]->dest_port != inport) 111 continue; 112 113 if (coresight_device_is_tpdm(in)) { 114 if (drvdata->dsb_esize || drvdata->cmb_esize) 115 return -EEXIST; 116 rc = tpdm_read_element_size(drvdata, in); 117 if (rc) 118 return rc; 119 } else { 120 /* Recurse down the path */ 121 rc = tpda_get_element_size(drvdata, in, -1); 122 if (rc) 123 return rc; 124 } 125 } 126 127 128 return rc; 129 } 130 131 /* Settings pre enabling port control register */ 132 static void tpda_enable_pre_port(struct tpda_drvdata *drvdata) 133 { 134 u32 val; 135 136 val = readl_relaxed(drvdata->base + TPDA_CR); 137 val &= ~TPDA_CR_ATID; 138 val |= FIELD_PREP(TPDA_CR_ATID, drvdata->atid); 139 writel_relaxed(val, drvdata->base + TPDA_CR); 140 } 141 142 static int tpda_enable_port(struct tpda_drvdata *drvdata, int port) 143 { 144 u32 val; 145 int rc; 146 147 val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port)); 148 tpda_clear_element_size(drvdata->csdev); 149 rc = tpda_get_element_size(drvdata, drvdata->csdev, port); 150 if (!rc && (drvdata->dsb_esize || drvdata->cmb_esize)) { 151 tpda_set_element_size(drvdata, &val); 152 /* Enable the port */ 153 val |= TPDA_Pn_CR_ENA; 154 writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port)); 155 } else if (rc == -EEXIST) 156 dev_warn_once(&drvdata->csdev->dev, 157 "Detected multiple TPDMs on port %d", port); 158 else 159 dev_warn_once(&drvdata->csdev->dev, 160 "Didn't find TPDM element size"); 161 162 return rc; 163 } 164 165 static int __tpda_enable(struct tpda_drvdata *drvdata, int port) 166 { 167 int ret; 168 169 CS_UNLOCK(drvdata->base); 170 171 /* 172 * Only do pre-port enable for first port that calls enable when the 173 * device's main refcount is still 0 174 */ 175 lockdep_assert_held(&drvdata->spinlock); 176 if (!drvdata->csdev->refcnt) 177 tpda_enable_pre_port(drvdata); 178 179 ret = tpda_enable_port(drvdata, port); 180 CS_LOCK(drvdata->base); 181 182 return ret; 183 } 184 185 static int tpda_enable(struct coresight_device *csdev, 186 struct coresight_connection *in, 187 struct coresight_connection *out) 188 { 189 struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 190 int ret = 0; 191 192 spin_lock(&drvdata->spinlock); 193 if (atomic_read(&in->dest_refcnt) == 0) { 194 ret = __tpda_enable(drvdata, in->dest_port); 195 if (!ret) { 196 atomic_inc(&in->dest_refcnt); 197 csdev->refcnt++; 198 dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", in->dest_port); 199 } 200 } 201 202 spin_unlock(&drvdata->spinlock); 203 return ret; 204 } 205 206 static void __tpda_disable(struct tpda_drvdata *drvdata, int port) 207 { 208 u32 val; 209 210 CS_UNLOCK(drvdata->base); 211 212 val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port)); 213 val &= ~TPDA_Pn_CR_ENA; 214 writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port)); 215 216 CS_LOCK(drvdata->base); 217 } 218 219 static void tpda_disable(struct coresight_device *csdev, 220 struct coresight_connection *in, 221 struct coresight_connection *out) 222 { 223 struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 224 225 spin_lock(&drvdata->spinlock); 226 if (atomic_dec_return(&in->dest_refcnt) == 0) { 227 __tpda_disable(drvdata, in->dest_port); 228 csdev->refcnt--; 229 } 230 spin_unlock(&drvdata->spinlock); 231 232 dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", in->dest_port); 233 } 234 235 static const struct coresight_ops_link tpda_link_ops = { 236 .enable = tpda_enable, 237 .disable = tpda_disable, 238 }; 239 240 static const struct coresight_ops tpda_cs_ops = { 241 .link_ops = &tpda_link_ops, 242 }; 243 244 static int tpda_init_default_data(struct tpda_drvdata *drvdata) 245 { 246 int atid; 247 /* 248 * TPDA must has a unique atid. This atid can uniquely 249 * identify the TPDM trace source connected to the TPDA. 250 * The TPDMs which are connected to same TPDA share the 251 * same trace-id. When TPDA does packetization, different 252 * port will have unique channel number for decoding. 253 */ 254 atid = coresight_trace_id_get_system_id(); 255 if (atid < 0) 256 return atid; 257 258 drvdata->atid = atid; 259 return 0; 260 } 261 262 static int tpda_probe(struct amba_device *adev, const struct amba_id *id) 263 { 264 int ret; 265 struct device *dev = &adev->dev; 266 struct coresight_platform_data *pdata; 267 struct tpda_drvdata *drvdata; 268 struct coresight_desc desc = { 0 }; 269 void __iomem *base; 270 271 pdata = coresight_get_platform_data(dev); 272 if (IS_ERR(pdata)) 273 return PTR_ERR(pdata); 274 adev->dev.platform_data = pdata; 275 276 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 277 if (!drvdata) 278 return -ENOMEM; 279 280 drvdata->dev = &adev->dev; 281 dev_set_drvdata(dev, drvdata); 282 283 base = devm_ioremap_resource(dev, &adev->res); 284 if (IS_ERR(base)) 285 return PTR_ERR(base); 286 drvdata->base = base; 287 288 spin_lock_init(&drvdata->spinlock); 289 290 ret = tpda_init_default_data(drvdata); 291 if (ret) 292 return ret; 293 294 desc.name = coresight_alloc_device_name(&tpda_devs, dev); 295 if (!desc.name) 296 return -ENOMEM; 297 desc.type = CORESIGHT_DEV_TYPE_LINK; 298 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG; 299 desc.ops = &tpda_cs_ops; 300 desc.pdata = adev->dev.platform_data; 301 desc.dev = &adev->dev; 302 desc.access = CSDEV_ACCESS_IOMEM(base); 303 drvdata->csdev = coresight_register(&desc); 304 if (IS_ERR(drvdata->csdev)) 305 return PTR_ERR(drvdata->csdev); 306 307 pm_runtime_put(&adev->dev); 308 309 dev_dbg(drvdata->dev, "TPDA initialized\n"); 310 return 0; 311 } 312 313 static void tpda_remove(struct amba_device *adev) 314 { 315 struct tpda_drvdata *drvdata = dev_get_drvdata(&adev->dev); 316 317 coresight_trace_id_put_system_id(drvdata->atid); 318 coresight_unregister(drvdata->csdev); 319 } 320 321 /* 322 * Different TPDA has different periph id. 323 * The difference is 0-7 bits' value. So ignore 0-7 bits. 324 */ 325 static struct amba_id tpda_ids[] = { 326 { 327 .id = 0x000f0f00, 328 .mask = 0x000fff00, 329 }, 330 { 0, 0, NULL }, 331 }; 332 333 static struct amba_driver tpda_driver = { 334 .drv = { 335 .name = "coresight-tpda", 336 .suppress_bind_attrs = true, 337 }, 338 .probe = tpda_probe, 339 .remove = tpda_remove, 340 .id_table = tpda_ids, 341 }; 342 343 module_amba_driver(tpda_driver); 344 345 MODULE_LICENSE("GPL"); 346 MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Aggregator driver"); 347