drivers/hwtracing/coresight/coresight-tmc.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/kernel.h>
   8 #include <linux/init.h>
   9 #include <linux/types.h>
  10 #include <linux/device.h>
  11 #include <linux/io.h>
  12 #include <linux/err.h>
  13 #include <linux/fs.h>
  14 #include <linux/miscdevice.h>
  15 #include <linux/property.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/slab.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/of.h>
  22 #include <linux/coresight.h>
  23 #include <linux/amba/bus.h>
  24
  25 #include "coresight-priv.h"
  26 #include "coresight-tmc.h"
  27
  28 void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
  29 {
  30         /* Ensure formatter, unformatter and hardware fifo are empty */
  31         if (coresight_timeout(drvdata->base,
  32                               TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
  33                 dev_err(drvdata->dev,
  34                         "timeout while waiting for TMC to be Ready\n");
  35         }
  36 }
  37
  38 void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
  39 {
  40         u32 ffcr;
  41
  42         ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
  43         ffcr |= TMC_FFCR_STOP_ON_FLUSH;
  44         writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
  45         ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
  46         writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
  47         /* Ensure flush completes */
  48         if (coresight_timeout(drvdata->base,
  49                               TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
  50                 dev_err(drvdata->dev,
  51                 "timeout while waiting for completion of Manual Flush\n");
  52         }
  53
  54         tmc_wait_for_tmcready(drvdata);
  55 }
  56
  57 void tmc_enable_hw(struct tmc_drvdata *drvdata)
  58 {
  59         writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
  60 }
  61
  62 void tmc_disable_hw(struct tmc_drvdata *drvdata)
  63 {
  64         writel_relaxed(0x0, drvdata->base + TMC_CTL);
  65 }
  66
  67 static int tmc_read_prepare(struct tmc_drvdata *drvdata)
  68 {
  69         int ret = 0;
  70
  71         switch (drvdata->config_type) {
  72         case TMC_CONFIG_TYPE_ETB:
  73         case TMC_CONFIG_TYPE_ETF:
  74                 ret = tmc_read_prepare_etb(drvdata);
  75                 break;
  76         case TMC_CONFIG_TYPE_ETR:
  77                 ret = tmc_read_prepare_etr(drvdata);
  78                 break;
  79         default:
  80                 ret = -EINVAL;
  81         }
  82
  83         if (!ret)
  84                 dev_info(drvdata->dev, "TMC read start\n");
  85
  86         return ret;
  87 }
  88
  89 static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
  90 {
  91         int ret = 0;
  92
  93         switch (drvdata->config_type) {
  94         case TMC_CONFIG_TYPE_ETB:
  95         case TMC_CONFIG_TYPE_ETF:
  96                 ret = tmc_read_unprepare_etb(drvdata);
  97                 break;
  98         case TMC_CONFIG_TYPE_ETR:
  99                 ret = tmc_read_unprepare_etr(drvdata);
 100                 break;
 101         default:
 102                 ret = -EINVAL;
 103         }
 104
 105         if (!ret)
 106                 dev_info(drvdata->dev, "TMC read end\n");
 107
 108         return ret;
 109 }
 110
 111 static int tmc_open(struct inode *inode, struct file *file)
 112 {
 113         int ret;
 114         struct tmc_drvdata *drvdata = container_of(file->private_data,
 115                                                    struct tmc_drvdata, miscdev);
 116
 117         ret = tmc_read_prepare(drvdata);
 118         if (ret)
 119                 return ret;
 120
 121         nonseekable_open(inode, file);
 122
 123         dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
 124         return 0;
 125 }
 126
 127 static inline ssize_t tmc_get_sysfs_trace(struct tmc_drvdata *drvdata,
 128                                           loff_t pos, size_t len, char **bufpp)
 129 {
 130         switch (drvdata->config_type) {
 131         case TMC_CONFIG_TYPE_ETB:
 132         case TMC_CONFIG_TYPE_ETF:
 133                 return tmc_etb_get_sysfs_trace(drvdata, pos, len, bufpp);
 134         case TMC_CONFIG_TYPE_ETR:
 135                 return tmc_etr_get_sysfs_trace(drvdata, pos, len, bufpp);
 136         }
 137
 138         return -EINVAL;
 139 }
 140
 141 static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
 142                         loff_t *ppos)
 143 {
 144         char *bufp;
 145         ssize_t actual;
 146         struct tmc_drvdata *drvdata = container_of(file->private_data,
 147                                                    struct tmc_drvdata, miscdev);
 148         actual = tmc_get_sysfs_trace(drvdata, *ppos, len, &bufp);
 149         if (actual <= 0)
 150                 return 0;
 151
 152         if (copy_to_user(data, bufp, actual)) {
 153                 dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
 154                 return -EFAULT;
 155         }
 156
 157         *ppos += actual;
 158         dev_dbg(drvdata->dev, "%zu bytes copied\n", actual);
 159
 160         return actual;
 161 }
 162
 163 static int tmc_release(struct inode *inode, struct file *file)
 164 {
 165         int ret;
 166         struct tmc_drvdata *drvdata = container_of(file->private_data,
 167                                                    struct tmc_drvdata, miscdev);
 168
 169         ret = tmc_read_unprepare(drvdata);
 170         if (ret)
 171                 return ret;
 172
 173         dev_dbg(drvdata->dev, "%s: released\n", __func__);
 174         return 0;
 175 }
 176
 177 static const struct file_operations tmc_fops = {
 178         .owner          = THIS_MODULE,
 179         .open           = tmc_open,
 180         .read           = tmc_read,
 181         .release        = tmc_release,
 182         .llseek         = no_llseek,
 183 };
 184
 185 static enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
 186 {
 187         enum tmc_mem_intf_width memwidth;
 188
 189         /*
 190          * Excerpt from the TRM:
 191          *
 192          * DEVID::MEMWIDTH[10:8]
 193          * 0x2 Memory interface databus is 32 bits wide.
 194          * 0x3 Memory interface databus is 64 bits wide.
 195          * 0x4 Memory interface databus is 128 bits wide.
 196          * 0x5 Memory interface databus is 256 bits wide.
 197          */
 198         switch (BMVAL(devid, 8, 10)) {
 199         case 0x2:
 200                 memwidth = TMC_MEM_INTF_WIDTH_32BITS;
 201                 break;
 202         case 0x3:
 203                 memwidth = TMC_MEM_INTF_WIDTH_64BITS;
 204                 break;
 205         case 0x4:
 206                 memwidth = TMC_MEM_INTF_WIDTH_128BITS;
 207                 break;
 208         case 0x5:
 209                 memwidth = TMC_MEM_INTF_WIDTH_256BITS;
 210                 break;
 211         default:
 212                 memwidth = 0;
 213         }
 214
 215         return memwidth;
 216 }
 217
 218 #define coresight_tmc_reg(name, offset)                 \
 219         coresight_simple_reg32(struct tmc_drvdata, name, offset)
 220 #define coresight_tmc_reg64(name, lo_off, hi_off)       \
 221         coresight_simple_reg64(struct tmc_drvdata, name, lo_off, hi_off)
 222
 223 coresight_tmc_reg(rsz, TMC_RSZ);
 224 coresight_tmc_reg(sts, TMC_STS);
 225 coresight_tmc_reg(trg, TMC_TRG);
 226 coresight_tmc_reg(ctl, TMC_CTL);
 227 coresight_tmc_reg(ffsr, TMC_FFSR);
 228 coresight_tmc_reg(ffcr, TMC_FFCR);
 229 coresight_tmc_reg(mode, TMC_MODE);
 230 coresight_tmc_reg(pscr, TMC_PSCR);
 231 coresight_tmc_reg(axictl, TMC_AXICTL);
 232 coresight_tmc_reg(devid, CORESIGHT_DEVID);
 233 coresight_tmc_reg64(rrp, TMC_RRP, TMC_RRPHI);
 234 coresight_tmc_reg64(rwp, TMC_RWP, TMC_RWPHI);
 235 coresight_tmc_reg64(dba, TMC_DBALO, TMC_DBAHI);
 236
 237 static struct attribute *coresight_tmc_mgmt_attrs[] = {
 238         &dev_attr_rsz.attr,
 239         &dev_attr_sts.attr,
 240         &dev_attr_rrp.attr,
 241         &dev_attr_rwp.attr,
 242         &dev_attr_trg.attr,
 243         &dev_attr_ctl.attr,
 244         &dev_attr_ffsr.attr,
 245         &dev_attr_ffcr.attr,
 246         &dev_attr_mode.attr,
 247         &dev_attr_pscr.attr,
 248         &dev_attr_devid.attr,
 249         &dev_attr_dba.attr,
 250         &dev_attr_axictl.attr,
 251         NULL,
 252 };
 253
 254 static ssize_t trigger_cntr_show(struct device *dev,
 255                                  struct device_attribute *attr, char *buf)
 256 {
 257         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 258         unsigned long val = drvdata->trigger_cntr;
 259
 260         return sprintf(buf, "%#lx\n", val);
 261 }
 262
 263 static ssize_t trigger_cntr_store(struct device *dev,
 264                              struct device_attribute *attr,
 265                              const char *buf, size_t size)
 266 {
 267         int ret;
 268         unsigned long val;
 269         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 270
 271         ret = kstrtoul(buf, 16, &val);
 272         if (ret)
 273                 return ret;
 274
 275         drvdata->trigger_cntr = val;
 276         return size;
 277 }
 278 static DEVICE_ATTR_RW(trigger_cntr);
 279
 280 static ssize_t buffer_size_show(struct device *dev,
 281                                 struct device_attribute *attr, char *buf)
 282 {
 283         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 284
 285         return sprintf(buf, "%#x\n", drvdata->size);
 286 }
 287
 288 static ssize_t buffer_size_store(struct device *dev,
 289                                  struct device_attribute *attr,
 290                                  const char *buf, size_t size)
 291 {
 292         int ret;
 293         unsigned long val;
 294         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 295
 296         /* Only permitted for TMC-ETRs */
 297         if (drvdata->config_type != TMC_CONFIG_TYPE_ETR)
 298                 return -EPERM;
 299
 300         ret = kstrtoul(buf, 0, &val);
 301         if (ret)
 302                 return ret;
 303         /* The buffer size should be page aligned */
 304         if (val & (PAGE_SIZE - 1))
 305                 return -EINVAL;
 306         drvdata->size = val;
 307         return size;
 308 }
 309
 310 static DEVICE_ATTR_RW(buffer_size);
 311
 312 static struct attribute *coresight_tmc_attrs[] = {
 313         &dev_attr_trigger_cntr.attr,
 314         &dev_attr_buffer_size.attr,
 315         NULL,
 316 };
 317
 318 static const struct attribute_group coresight_tmc_group = {
 319         .attrs = coresight_tmc_attrs,
 320 };
 321
 322 static const struct attribute_group coresight_tmc_mgmt_group = {
 323         .attrs = coresight_tmc_mgmt_attrs,
 324         .name = "mgmt",
 325 };
 326
 327 const struct attribute_group *coresight_tmc_groups[] = {
 328         &coresight_tmc_group,
 329         &coresight_tmc_mgmt_group,
 330         NULL,
 331 };
 332
 333 static inline bool tmc_etr_can_use_sg(struct tmc_drvdata *drvdata)
 334 {
 335         return fwnode_property_present(drvdata->dev->fwnode,
 336                                        "arm,scatter-gather");
 337 }
 338
 339 /* Detect and initialise the capabilities of a TMC ETR */
 340 static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata,
 341                              u32 devid, void *dev_caps)
 342 {
 343         u32 dma_mask = 0;
 344
 345         /* Set the unadvertised capabilities */
 346         tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
 347
 348         if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(drvdata))
 349                 tmc_etr_set_cap(drvdata, TMC_ETR_SG);
 350
 351         /* Check if the AXI address width is available */
 352         if (devid & TMC_DEVID_AXIAW_VALID)
 353                 dma_mask = ((devid >> TMC_DEVID_AXIAW_SHIFT) &
 354                                 TMC_DEVID_AXIAW_MASK);
 355
 356         /*
 357          * Unless specified in the device configuration, ETR uses a 40-bit
 358          * AXI master in place of the embedded SRAM of ETB/ETF.
 359          */
 360         switch (dma_mask) {
 361         case 32:
 362         case 40:
 363         case 44:
 364         case 48:
 365         case 52:
 366                 dev_info(drvdata->dev, "Detected dma mask %dbits\n", dma_mask);
 367                 break;
 368         default:
 369                 dma_mask = 40;
 370         }
 371
 372         return dma_set_mask_and_coherent(drvdata->dev, DMA_BIT_MASK(dma_mask));
 373 }
 374
 375 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 376 {
 377         int ret = 0;
 378         u32 devid;
 379         void __iomem *base;
 380         struct device *dev = &adev->dev;
 381         struct coresight_platform_data *pdata = NULL;
 382         struct tmc_drvdata *drvdata;
 383         struct resource *res = &adev->res;
 384         struct coresight_desc desc = { 0 };
 385         struct device_node *np = adev->dev.of_node;
 386
 387         if (np) {
 388                 pdata = of_get_coresight_platform_data(dev, np);
 389                 if (IS_ERR(pdata)) {
 390                         ret = PTR_ERR(pdata);
 391                         goto out;
 392                 }
 393                 adev->dev.platform_data = pdata;
 394         }
 395
 396         ret = -ENOMEM;
 397         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 398         if (!drvdata)
 399                 goto out;
 400
 401         drvdata->dev = &adev->dev;
 402         dev_set_drvdata(dev, drvdata);
 403
 404         /* Validity for the resource is already checked by the AMBA core */
 405         base = devm_ioremap_resource(dev, res);
 406         if (IS_ERR(base)) {
 407                 ret = PTR_ERR(base);
 408                 goto out;
 409         }
 410
 411         drvdata->base = base;
 412
 413         spin_lock_init(&drvdata->spinlock);
 414
 415         devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
 416         drvdata->config_type = BMVAL(devid, 6, 7);
 417         drvdata->memwidth = tmc_get_memwidth(devid);
 418
 419         if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
 420                 if (np)
 421                         ret = of_property_read_u32(np,
 422                                                    "arm,buffer-size",
 423                                                    &drvdata->size);
 424                 if (ret)
 425                         drvdata->size = SZ_1M;
 426         } else {
 427                 drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
 428         }
 429
 430         pm_runtime_put(&adev->dev);
 431
 432         desc.pdata = pdata;
 433         desc.dev = dev;
 434         desc.groups = coresight_tmc_groups;
 435
 436         switch (drvdata->config_type) {
 437         case TMC_CONFIG_TYPE_ETB:
 438                 desc.type = CORESIGHT_DEV_TYPE_SINK;
 439                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 440                 desc.ops = &tmc_etb_cs_ops;
 441                 break;
 442         case TMC_CONFIG_TYPE_ETR:
 443                 desc.type = CORESIGHT_DEV_TYPE_SINK;
 444                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 445                 desc.ops = &tmc_etr_cs_ops;
 446                 ret = tmc_etr_setup_caps(drvdata, devid, id->data);
 447                 if (ret)
 448                         goto out;
 449                 break;
 450         case TMC_CONFIG_TYPE_ETF:
 451                 desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
 452                 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
 453                 desc.ops = &tmc_etf_cs_ops;
 454                 break;
 455         default:
 456                 pr_err("%s: Unsupported TMC config\n", pdata->name);
 457                 ret = -EINVAL;
 458                 goto out;
 459         }
 460
 461         drvdata->csdev = coresight_register(&desc);
 462         if (IS_ERR(drvdata->csdev)) {
 463                 ret = PTR_ERR(drvdata->csdev);
 464                 goto out;
 465         }
 466
 467         drvdata->miscdev.name = pdata->name;
 468         drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 469         drvdata->miscdev.fops = &tmc_fops;
 470         ret = misc_register(&drvdata->miscdev);
 471         if (ret)
 472                 coresight_unregister(drvdata->csdev);
 473 out:
 474         return ret;
 475 }
 476
 477 static const struct amba_id tmc_ids[] = {
 478         {
 479                 .id     = 0x000bb961,
 480                 .mask   = 0x000fffff,
 481         },
 482         {
 483                 /* Coresight SoC 600 TMC-ETR/ETS */
 484                 .id     = 0x000bb9e8,
 485                 .mask   = 0x000fffff,
 486                 .data   = (void *)(unsigned long)CORESIGHT_SOC_600_ETR_CAPS,
 487         },
 488         {
 489                 /* Coresight SoC 600 TMC-ETB */
 490                 .id     = 0x000bb9e9,
 491                 .mask   = 0x000fffff,
 492         },
 493         {
 494                 /* Coresight SoC 600 TMC-ETF */
 495                 .id     = 0x000bb9ea,
 496                 .mask   = 0x000fffff,
 497         },
 498         { 0, 0},
 499 };
 500
 501 static struct amba_driver tmc_driver = {
 502         .drv = {
 503                 .name   = "coresight-tmc",
 504                 .owner  = THIS_MODULE,
 505                 .suppress_bind_attrs = true,
 506         },
 507         .probe          = tmc_probe,
 508         .id_table       = tmc_ids,
 509 };
 510 builtin_amba_driver(tmc_driver);