drivers/hwtracing/coresight/coresight-tmc-core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
   3  *
   4  * Description: CoreSight Trace Memory Controller driver
   5  */
   6
   7 #include <linux/acpi.h>
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/types.h>
  11 #include <linux/device.h>
  12 #include <linux/idr.h>
  13 #include <linux/io.h>
  14 #include <linux/iommu.h>
  15 #include <linux/err.h>
  16 #include <linux/fs.h>
  17 #include <linux/miscdevice.h>
  18 #include <linux/mutex.h>
  19 #include <linux/property.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/slab.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/of.h>
  26 #include <linux/coresight.h>
  27 #include <linux/amba/bus.h>
  28 #include <linux/platform_device.h>
  29
  30 #include "coresight-priv.h"
  31 #include "coresight-tmc.h"
  32
  33 DEFINE_CORESIGHT_DEVLIST(etb_devs, "tmc_etb");
  34 DEFINE_CORESIGHT_DEVLIST(etf_devs, "tmc_etf");
  35 DEFINE_CORESIGHT_DEVLIST(etr_devs, "tmc_etr");
  36
  37 int tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
  38 {
  39         struct coresight_device *csdev = drvdata->csdev;
  40         struct csdev_access *csa = &csdev->access;
  41
  42         /* Ensure formatter, unformatter and hardware fifo are empty */
  43         if (coresight_timeout(csa, TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
  44                 dev_err(&csdev->dev,
  45                         "timeout while waiting for TMC to be Ready\n");
  46                 return -EBUSY;
  47         }
  48         return 0;
  49 }
  50
  51 void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
  52 {
  53         struct coresight_device *csdev = drvdata->csdev;
  54         struct csdev_access *csa = &csdev->access;
  55         u32 ffcr;
  56
  57         ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
  58         ffcr |= TMC_FFCR_STOP_ON_FLUSH;
  59         writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
  60         ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
  61         writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
  62         /* Ensure flush completes */
  63         if (coresight_timeout(csa, TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
  64                 dev_err(&csdev->dev,
  65                 "timeout while waiting for completion of Manual Flush\n");
  66         }
  67
  68         tmc_wait_for_tmcready(drvdata);
  69 }
  70
  71 void tmc_enable_hw(struct tmc_drvdata *drvdata)
  72 {
  73         writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
  74 }
  75
  76 void tmc_disable_hw(struct tmc_drvdata *drvdata)
  77 {
  78         writel_relaxed(0x0, drvdata->base + TMC_CTL);
  79 }
  80
  81 u32 tmc_get_memwidth_mask(struct tmc_drvdata *drvdata)
  82 {
  83         u32 mask = 0;
  84
  85         /*
  86          * When moving RRP or an offset address forward, the new values must
  87          * be byte-address aligned to the width of the trace memory databus
  88          * _and_ to a frame boundary (16 byte), whichever is the biggest. For
  89          * example, for 32-bit, 64-bit and 128-bit wide trace memory, the four
  90          * LSBs must be 0s. For 256-bit wide trace memory, the five LSBs must
  91          * be 0s.
  92          */
  93         switch (drvdata->memwidth) {
  94         case TMC_MEM_INTF_WIDTH_32BITS:
  95         case TMC_MEM_INTF_WIDTH_64BITS:
  96         case TMC_MEM_INTF_WIDTH_128BITS:
  97                 mask = GENMASK(31, 4);
  98                 break;
  99         case TMC_MEM_INTF_WIDTH_256BITS:
 100                 mask = GENMASK(31, 5);
 101                 break;
 102         }
 103
 104         return mask;
 105 }
 106
 107 static int tmc_read_prepare(struct tmc_drvdata *drvdata)
 108 {
 109         int ret = 0;
 110
 111         switch (drvdata->config_type) {
 112         case TMC_CONFIG_TYPE_ETB:
 113         case TMC_CONFIG_TYPE_ETF:
 114                 ret = tmc_read_prepare_etb(drvdata);
 115                 break;
 116         case TMC_CONFIG_TYPE_ETR:
 117                 ret = tmc_read_prepare_etr(drvdata);
 118                 break;
 119         default:
 120                 ret = -EINVAL;
 121         }
 122
 123         if (!ret)
 124                 dev_dbg(&drvdata->csdev->dev, "TMC read start\n");
 125
 126         return ret;
 127 }
 128
 129 static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
 130 {
 131         int ret = 0;
 132
 133         switch (drvdata->config_type) {
 134         case TMC_CONFIG_TYPE_ETB:
 135         case TMC_CONFIG_TYPE_ETF:
 136                 ret = tmc_read_unprepare_etb(drvdata);
 137                 break;
 138         case TMC_CONFIG_TYPE_ETR:
 139                 ret = tmc_read_unprepare_etr(drvdata);
 140                 break;
 141         default:
 142                 ret = -EINVAL;
 143         }
 144
 145         if (!ret)
 146                 dev_dbg(&drvdata->csdev->dev, "TMC read end\n");
 147
 148         return ret;
 149 }
 150
 151 static int tmc_open(struct inode *inode, struct file *file)
 152 {
 153         int ret;
 154         struct tmc_drvdata *drvdata = container_of(file->private_data,
 155                                                    struct tmc_drvdata, miscdev);
 156
 157         ret = tmc_read_prepare(drvdata);
 158         if (ret)
 159                 return ret;
 160
 161         nonseekable_open(inode, file);
 162
 163         dev_dbg(&drvdata->csdev->dev, "%s: successfully opened\n", __func__);
 164         return 0;
 165 }
 166
 167 static inline ssize_t tmc_get_sysfs_trace(struct tmc_drvdata *drvdata,
 168                                           loff_t pos, size_t len, char **bufpp)
 169 {
 170         switch (drvdata->config_type) {
 171         case TMC_CONFIG_TYPE_ETB:
 172         case TMC_CONFIG_TYPE_ETF:
 173                 return tmc_etb_get_sysfs_trace(drvdata, pos, len, bufpp);
 174         case TMC_CONFIG_TYPE_ETR:
 175                 return tmc_etr_get_sysfs_trace(drvdata, pos, len, bufpp);
 176         }
 177
 178         return -EINVAL;
 179 }
 180
 181 static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
 182                         loff_t *ppos)
 183 {
 184         char *bufp;
 185         ssize_t actual;
 186         struct tmc_drvdata *drvdata = container_of(file->private_data,
 187                                                    struct tmc_drvdata, miscdev);
 188         actual = tmc_get_sysfs_trace(drvdata, *ppos, len, &bufp);
 189         if (actual <= 0)
 190                 return 0;
 191
 192         if (copy_to_user(data, bufp, actual)) {
 193                 dev_dbg(&drvdata->csdev->dev,
 194                         "%s: copy_to_user failed\n", __func__);
 195                 return -EFAULT;
 196         }
 197
 198         *ppos += actual;
 199         dev_dbg(&drvdata->csdev->dev, "%zu bytes copied\n", actual);
 200
 201         return actual;
 202 }
 203
 204 static int tmc_release(struct inode *inode, struct file *file)
 205 {
 206         int ret;
 207         struct tmc_drvdata *drvdata = container_of(file->private_data,
 208                                                    struct tmc_drvdata, miscdev);
 209
 210         ret = tmc_read_unprepare(drvdata);
 211         if (ret)
 212                 return ret;
 213
 214         dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__);
 215         return 0;
 216 }
 217
 218 static const struct file_operations tmc_fops = {
 219         .owner          = THIS_MODULE,
 220         .open           = tmc_open,
 221         .read           = tmc_read,
 222         .release        = tmc_release,
 223         .llseek         = no_llseek,
 224 };
 225
 226 static enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
 227 {
 228         enum tmc_mem_intf_width memwidth;
 229
 230         /*
 231          * Excerpt from the TRM:
 232          *
 233          * DEVID::MEMWIDTH[10:8]
 234          * 0x2 Memory interface databus is 32 bits wide.
 235          * 0x3 Memory interface databus is 64 bits wide.
 236          * 0x4 Memory interface databus is 128 bits wide.
 237          * 0x5 Memory interface databus is 256 bits wide.
 238          */
 239         switch (BMVAL(devid, 8, 10)) {
 240         case 0x2:
 241                 memwidth = TMC_MEM_INTF_WIDTH_32BITS;
 242                 break;
 243         case 0x3:
 244                 memwidth = TMC_MEM_INTF_WIDTH_64BITS;
 245                 break;
 246         case 0x4:
 247                 memwidth = TMC_MEM_INTF_WIDTH_128BITS;
 248                 break;
 249         case 0x5:
 250                 memwidth = TMC_MEM_INTF_WIDTH_256BITS;
 251                 break;
 252         default:
 253                 memwidth = 0;
 254         }
 255
 256         return memwidth;
 257 }
 258
 259 static struct attribute *coresight_tmc_mgmt_attrs[] = {
 260         coresight_simple_reg32(rsz, TMC_RSZ),
 261         coresight_simple_reg32(sts, TMC_STS),
 262         coresight_simple_reg64(rrp, TMC_RRP, TMC_RRPHI),
 263         coresight_simple_reg64(rwp, TMC_RWP, TMC_RWPHI),
 264         coresight_simple_reg32(trg, TMC_TRG),
 265         coresight_simple_reg32(ctl, TMC_CTL),
 266         coresight_simple_reg32(ffsr, TMC_FFSR),
 267         coresight_simple_reg32(ffcr, TMC_FFCR),
 268         coresight_simple_reg32(mode, TMC_MODE),
 269         coresight_simple_reg32(pscr, TMC_PSCR),
 270         coresight_simple_reg32(devid, CORESIGHT_DEVID),
 271         coresight_simple_reg64(dba, TMC_DBALO, TMC_DBAHI),
 272         coresight_simple_reg32(axictl, TMC_AXICTL),
 273         coresight_simple_reg32(authstatus, TMC_AUTHSTATUS),
 274         NULL,
 275 };
 276
 277 static ssize_t trigger_cntr_show(struct device *dev,
 278                                  struct device_attribute *attr, char *buf)
 279 {
 280         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 281         unsigned long val = drvdata->trigger_cntr;
 282
 283         return sprintf(buf, "%#lx\n", val);
 284 }
 285
 286 static ssize_t trigger_cntr_store(struct device *dev,
 287                              struct device_attribute *attr,
 288                              const char *buf, size_t size)
 289 {
 290         int ret;
 291         unsigned long val;
 292         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 293
 294         ret = kstrtoul(buf, 16, &val);
 295         if (ret)
 296                 return ret;
 297
 298         drvdata->trigger_cntr = val;
 299         return size;
 300 }
 301 static DEVICE_ATTR_RW(trigger_cntr);
 302
 303 static ssize_t buffer_size_show(struct device *dev,
 304                                 struct device_attribute *attr, char *buf)
 305 {
 306         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 307
 308         return sprintf(buf, "%#x\n", drvdata->size);
 309 }
 310
 311 static ssize_t buffer_size_store(struct device *dev,
 312                                  struct device_attribute *attr,
 313                                  const char *buf, size_t size)
 314 {
 315         int ret;
 316         unsigned long val;
 317         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 318
 319         /* Only permitted for TMC-ETRs */
 320         if (drvdata->config_type != TMC_CONFIG_TYPE_ETR)
 321                 return -EPERM;
 322
 323         ret = kstrtoul(buf, 0, &val);
 324         if (ret)
 325                 return ret;
 326         /* The buffer size should be page aligned */
 327         if (val & (PAGE_SIZE - 1))
 328                 return -EINVAL;
 329         drvdata->size = val;
 330         return size;
 331 }
 332
 333 static DEVICE_ATTR_RW(buffer_size);
 334
 335 static struct attribute *coresight_tmc_attrs[] = {
 336         &dev_attr_trigger_cntr.attr,
 337         &dev_attr_buffer_size.attr,
 338         NULL,
 339 };
 340
 341 static const struct attribute_group coresight_tmc_group = {
 342         .attrs = coresight_tmc_attrs,
 343 };
 344
 345 static const struct attribute_group coresight_tmc_mgmt_group = {
 346         .attrs = coresight_tmc_mgmt_attrs,
 347         .name = "mgmt",
 348 };
 349
 350 static const struct attribute_group *coresight_etf_groups[] = {
 351         &coresight_tmc_group,
 352         &coresight_tmc_mgmt_group,
 353         NULL,
 354 };
 355
 356 static const struct attribute_group *coresight_etr_groups[] = {
 357         &coresight_etr_group,
 358         &coresight_tmc_group,
 359         &coresight_tmc_mgmt_group,
 360         NULL,
 361 };
 362
 363 static inline bool tmc_etr_can_use_sg(struct device *dev)
 364 {
 365         int ret;
 366         u8 val_u8;
 367
 368         /*
 369          * Presence of the property 'arm,scatter-gather' is checked
 370          * on the platform for the feature support, rather than its
 371          * value.
 372          */
 373         if (is_of_node(dev->fwnode)) {
 374                 return fwnode_property_present(dev->fwnode, "arm,scatter-gather");
 375         } else if (is_acpi_device_node(dev->fwnode)) {
 376                 /*
 377                  * TMC_DEVID_NOSCAT test in tmc_etr_setup_caps(), has already ensured
 378                  * this property is only checked for Coresight SoC 400 TMC configured
 379                  * as ETR.
 380                  */
 381                 ret = fwnode_property_read_u8(dev->fwnode, "arm-armhc97c-sg-enable", &val_u8);
 382                 if (!ret)
 383                         return !!val_u8;
 384
 385                 if (fwnode_property_present(dev->fwnode, "arm,scatter-gather")) {
 386                         pr_warn_once("Deprecated ACPI property - arm,scatter-gather\n");
 387                         return true;
 388                 }
 389         }
 390         return false;
 391 }
 392
 393 static inline bool tmc_etr_has_non_secure_access(struct tmc_drvdata *drvdata)
 394 {
 395         u32 auth = readl_relaxed(drvdata->base + TMC_AUTHSTATUS);
 396
 397         return (auth & TMC_AUTH_NSID_MASK) == 0x3;
 398 }
 399
 400 static const struct amba_id tmc_ids[];
 401
 402 /* Detect and initialise the capabilities of a TMC ETR */
 403 static int tmc_etr_setup_caps(struct device *parent, u32 devid,
 404                               struct csdev_access *access)
 405 {
 406         int rc;
 407         u32 tmc_pid, dma_mask = 0;
 408         struct tmc_drvdata *drvdata = dev_get_drvdata(parent);
 409         void *dev_caps;
 410
 411         if (!tmc_etr_has_non_secure_access(drvdata))
 412                 return -EACCES;
 413
 414         tmc_pid = coresight_get_pid(access);
 415         dev_caps = coresight_get_uci_data_from_amba(tmc_ids, tmc_pid);
 416
 417         /* Set the unadvertised capabilities */
 418         tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
 419
 420         if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(parent))
 421                 tmc_etr_set_cap(drvdata, TMC_ETR_SG);
 422
 423         /* Check if the AXI address width is available */
 424         if (devid & TMC_DEVID_AXIAW_VALID)
 425                 dma_mask = ((devid >> TMC_DEVID_AXIAW_SHIFT) &
 426                                 TMC_DEVID_AXIAW_MASK);
 427
 428         /*
 429          * Unless specified in the device configuration, ETR uses a 40-bit
 430          * AXI master in place of the embedded SRAM of ETB/ETF.
 431          */
 432         switch (dma_mask) {
 433         case 32:
 434         case 40:
 435         case 44:
 436         case 48:
 437         case 52:
 438                 dev_info(parent, "Detected dma mask %dbits\n", dma_mask);
 439                 break;
 440         default:
 441                 dma_mask = 40;
 442         }
 443
 444         rc = dma_set_mask_and_coherent(parent, DMA_BIT_MASK(dma_mask));
 445         if (rc)
 446                 dev_err(parent, "Failed to setup DMA mask: %d\n", rc);
 447         return rc;
 448 }
 449
 450 static u32 tmc_etr_get_default_buffer_size(struct device *dev)
 451 {
 452         u32 size;
 453
 454         if (fwnode_property_read_u32(dev->fwnode, "arm,buffer-size", &size))
 455                 size = SZ_1M;
 456         return size;
 457 }
 458
 459 static u32 tmc_etr_get_max_burst_size(struct device *dev)
 460 {
 461         u32 burst_size;
 462
 463         if (fwnode_property_read_u32(dev->fwnode, "arm,max-burst-size",
 464                                      &burst_size))
 465                 return TMC_AXICTL_WR_BURST_16;
 466
 467         /* Only permissible values are 0 to 15 */
 468         if (burst_size > 0xF)
 469                 burst_size = TMC_AXICTL_WR_BURST_16;
 470
 471         return burst_size;
 472 }
 473
 474 static int __tmc_probe(struct device *dev, struct resource *res)
 475 {
 476         int ret = 0;
 477         u32 devid;
 478         void __iomem *base;
 479         struct coresight_platform_data *pdata = NULL;
 480         struct tmc_drvdata *drvdata = dev_get_drvdata(dev);
 481         struct coresight_desc desc = { 0 };
 482         struct coresight_dev_list *dev_list = NULL;
 483
 484         ret = -ENOMEM;
 485
 486         /* Validity for the resource is already checked by the AMBA core */
 487         base = devm_ioremap_resource(dev, res);
 488         if (IS_ERR(base)) {
 489                 ret = PTR_ERR(base);
 490                 goto out;
 491         }
 492
 493         drvdata->base = base;
 494         desc.access = CSDEV_ACCESS_IOMEM(base);
 495
 496         spin_lock_init(&drvdata->spinlock);
 497
 498         devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
 499         drvdata->config_type = BMVAL(devid, 6, 7);
 500         drvdata->memwidth = tmc_get_memwidth(devid);
 501         /* This device is not associated with a session */
 502         drvdata->pid = -1;
 503         drvdata->etr_mode = ETR_MODE_AUTO;
 504
 505         if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
 506                 drvdata->size = tmc_etr_get_default_buffer_size(dev);
 507                 drvdata->max_burst_size = tmc_etr_get_max_burst_size(dev);
 508         } else {
 509                 drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
 510         }
 511
 512         desc.dev = dev;
 513
 514         switch (drvdata->config_type) {
 515         case TMC_CONFIG_TYPE_ETB:
 516                 desc.groups = coresight_etf_groups;
 517                 desc.type = CORESIGHT_DEV_TYPE_SINK;
 518                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 519                 desc.ops = &tmc_etb_cs_ops;
 520                 dev_list = &etb_devs;
 521                 break;
 522         case TMC_CONFIG_TYPE_ETR:
 523                 desc.groups = coresight_etr_groups;
 524                 desc.type = CORESIGHT_DEV_TYPE_SINK;
 525                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_SYSMEM;
 526                 desc.ops = &tmc_etr_cs_ops;
 527                 ret = tmc_etr_setup_caps(dev, devid, &desc.access);
 528                 if (ret)
 529                         goto out;
 530                 idr_init(&drvdata->idr);
 531                 mutex_init(&drvdata->idr_mutex);
 532                 dev_list = &etr_devs;
 533                 break;
 534         case TMC_CONFIG_TYPE_ETF:
 535                 desc.groups = coresight_etf_groups;
 536                 desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
 537                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 538                 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
 539                 desc.ops = &tmc_etf_cs_ops;
 540                 dev_list = &etf_devs;
 541                 break;
 542         default:
 543                 pr_err("%s: Unsupported TMC config\n", desc.name);
 544                 ret = -EINVAL;
 545                 goto out;
 546         }
 547
 548         desc.name = coresight_alloc_device_name(dev_list, dev);
 549         if (!desc.name) {
 550                 ret = -ENOMEM;
 551                 goto out;
 552         }
 553
 554         pdata = coresight_get_platform_data(dev);
 555         if (IS_ERR(pdata)) {
 556                 ret = PTR_ERR(pdata);
 557                 goto out;
 558         }
 559         dev->platform_data = pdata;
 560         desc.pdata = pdata;
 561
 562         drvdata->csdev = coresight_register(&desc);
 563         if (IS_ERR(drvdata->csdev)) {
 564                 ret = PTR_ERR(drvdata->csdev);
 565                 goto out;
 566         }
 567
 568         drvdata->miscdev.name = desc.name;
 569         drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 570         drvdata->miscdev.fops = &tmc_fops;
 571         ret = misc_register(&drvdata->miscdev);
 572         if (ret)
 573                 coresight_unregister(drvdata->csdev);
 574 out:
 575         return ret;
 576 }
 577
 578 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 579 {
 580         struct tmc_drvdata *drvdata;
 581         int ret;
 582
 583         drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL);
 584         if (!drvdata)
 585                 return -ENOMEM;
 586
 587         amba_set_drvdata(adev, drvdata);
 588         ret = __tmc_probe(&adev->dev, &adev->res);
 589         if (!ret)
 590                 pm_runtime_put(&adev->dev);
 591
 592         return ret;
 593 }
 594
 595 static void tmc_shutdown(struct amba_device *adev)
 596 {
 597         unsigned long flags;
 598         struct tmc_drvdata *drvdata = amba_get_drvdata(adev);
 599
 600         spin_lock_irqsave(&drvdata->spinlock, flags);
 601
 602         if (coresight_get_mode(drvdata->csdev) == CS_MODE_DISABLED)
 603                 goto out;
 604
 605         if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
 606                 tmc_etr_disable_hw(drvdata);
 607
 608         /*
 609          * We do not care about coresight unregister here unlike remove
 610          * callback which is required for making coresight modular since
 611          * the system is going down after this.
 612          */
 613 out:
 614         spin_unlock_irqrestore(&drvdata->spinlock, flags);
 615 }
 616
 617 static void __tmc_remove(struct device *dev)
 618 {
 619         struct tmc_drvdata *drvdata = dev_get_drvdata(dev);
 620
 621         /*
 622          * Since misc_open() holds a refcount on the f_ops, which is
 623          * etb fops in this case, device is there until last file
 624          * handler to this device is closed.
 625          */
 626         misc_deregister(&drvdata->miscdev);
 627         coresight_unregister(drvdata->csdev);
 628 }
 629
 630 static void tmc_remove(struct amba_device *adev)
 631 {
 632         __tmc_remove(&adev->dev);
 633 }
 634
 635 static const struct amba_id tmc_ids[] = {
 636         CS_AMBA_ID(0x000bb961),
 637         /* Coresight SoC 600 TMC-ETR/ETS */
 638         CS_AMBA_ID_DATA(0x000bb9e8, (unsigned long)CORESIGHT_SOC_600_ETR_CAPS),
 639         /* Coresight SoC 600 TMC-ETB */
 640         CS_AMBA_ID(0x000bb9e9),
 641         /* Coresight SoC 600 TMC-ETF */
 642         CS_AMBA_ID(0x000bb9ea),
 643         { 0, 0, NULL },
 644 };
 645
 646 MODULE_DEVICE_TABLE(amba, tmc_ids);
 647
 648 static struct amba_driver tmc_driver = {
 649         .drv = {
 650                 .name   = "coresight-tmc",
 651                 .suppress_bind_attrs = true,
 652         },
 653         .probe          = tmc_probe,
 654         .shutdown       = tmc_shutdown,
 655         .remove         = tmc_remove,
 656         .id_table       = tmc_ids,
 657 };
 658
 659 static int tmc_platform_probe(struct platform_device *pdev)
 660 {
 661         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 662         struct tmc_drvdata *drvdata;
 663         int ret = 0;
 664
 665         drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
 666         if (!drvdata)
 667                 return -ENOMEM;
 668
 669         drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev);
 670         if (IS_ERR(drvdata->pclk))
 671                 return -ENODEV;
 672
 673         dev_set_drvdata(&pdev->dev, drvdata);
 674         pm_runtime_get_noresume(&pdev->dev);
 675         pm_runtime_set_active(&pdev->dev);
 676         pm_runtime_enable(&pdev->dev);
 677
 678         ret = __tmc_probe(&pdev->dev, res);
 679         pm_runtime_put(&pdev->dev);
 680         if (ret)
 681                 pm_runtime_disable(&pdev->dev);
 682
 683         return ret;
 684 }
 685
 686 static void tmc_platform_remove(struct platform_device *pdev)
 687 {
 688         struct tmc_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
 689
 690         if (WARN_ON(!drvdata))
 691                 return;
 692
 693         __tmc_remove(&pdev->dev);
 694         pm_runtime_disable(&pdev->dev);
 695         if (!IS_ERR_OR_NULL(drvdata->pclk))
 696                 clk_put(drvdata->pclk);
 697 }
 698
 699 #ifdef CONFIG_PM
 700 static int tmc_runtime_suspend(struct device *dev)
 701 {
 702         struct tmc_drvdata *drvdata = dev_get_drvdata(dev);
 703
 704         if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
 705                 clk_disable_unprepare(drvdata->pclk);
 706         return 0;
 707 }
 708
 709 static int tmc_runtime_resume(struct device *dev)
 710 {
 711         struct tmc_drvdata *drvdata = dev_get_drvdata(dev);
 712
 713         if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
 714                 clk_prepare_enable(drvdata->pclk);
 715         return 0;
 716 }
 717 #endif
 718
 719 static const struct dev_pm_ops tmc_dev_pm_ops = {
 720         SET_RUNTIME_PM_OPS(tmc_runtime_suspend, tmc_runtime_resume, NULL)
 721 };
 722
 723 #ifdef CONFIG_ACPI
 724 static const struct acpi_device_id tmc_acpi_ids[] = {
 725         {"ARMHC501", 0, 0, 0}, /* ARM CoreSight ETR */
 726         {"ARMHC97C", 0, 0, 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
 727         {},
 728 };
 729 MODULE_DEVICE_TABLE(acpi, tmc_acpi_ids);
 730 #endif
 731
 732 static struct platform_driver tmc_platform_driver = {
 733         .probe  = tmc_platform_probe,
 734         .remove_new = tmc_platform_remove,
 735         .driver = {
 736                 .name                   = "coresight-tmc-platform",
 737                 .acpi_match_table       = ACPI_PTR(tmc_acpi_ids),
 738                 .suppress_bind_attrs    = true,
 739                 .pm                     = &tmc_dev_pm_ops,
 740         },
 741 };
 742
 743 static int __init tmc_init(void)
 744 {
 745         return coresight_init_driver("tmc", &tmc_driver, &tmc_platform_driver);
 746 }
 747
 748 static void __exit tmc_exit(void)
 749 {
 750         coresight_remove_driver(&tmc_driver, &tmc_platform_driver);
 751 }
 752 module_init(tmc_init);
 753 module_exit(tmc_exit);
 754
 755 MODULE_AUTHOR("Pratik Patel <[email protected]>");
 756 MODULE_DESCRIPTION("Arm CoreSight Trace Memory Controller driver");
 757 MODULE_LICENSE("GPL v2");