drivers/hwtracing/coresight/coresight-tmc.c

   1 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
   2  *
   3  * Description: CoreSight Trace Memory Controller 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/init.h>
  17 #include <linux/types.h>
  18 #include <linux/device.h>
  19 #include <linux/io.h>
  20 #include <linux/err.h>
  21 #include <linux/fs.h>
  22 #include <linux/miscdevice.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/slab.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/of.h>
  29 #include <linux/coresight.h>
  30 #include <linux/amba/bus.h>
  31
  32 #include "coresight-priv.h"
  33 #include "coresight-tmc.h"
  34
  35 void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
  36 {
  37         /* Ensure formatter, unformatter and hardware fifo are empty */
  38         if (coresight_timeout(drvdata->base,
  39                               TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
  40                 dev_err(drvdata->dev,
  41                         "timeout while waiting for TMC to be Ready\n");
  42         }
  43 }
  44
  45 void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
  46 {
  47         u32 ffcr;
  48
  49         ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
  50         ffcr |= TMC_FFCR_STOP_ON_FLUSH;
  51         writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
  52         ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
  53         writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
  54         /* Ensure flush completes */
  55         if (coresight_timeout(drvdata->base,
  56                               TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
  57                 dev_err(drvdata->dev,
  58                 "timeout while waiting for completion of Manual Flush\n");
  59         }
  60
  61         tmc_wait_for_tmcready(drvdata);
  62 }
  63
  64 void tmc_enable_hw(struct tmc_drvdata *drvdata)
  65 {
  66         writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
  67 }
  68
  69 void tmc_disable_hw(struct tmc_drvdata *drvdata)
  70 {
  71         writel_relaxed(0x0, drvdata->base + TMC_CTL);
  72 }
  73
  74 static int tmc_read_prepare(struct tmc_drvdata *drvdata)
  75 {
  76         int ret = 0;
  77
  78         switch (drvdata->config_type) {
  79         case TMC_CONFIG_TYPE_ETB:
  80         case TMC_CONFIG_TYPE_ETF:
  81                 ret = tmc_read_prepare_etb(drvdata);
  82                 break;
  83         case TMC_CONFIG_TYPE_ETR:
  84                 ret = tmc_read_prepare_etr(drvdata);
  85                 break;
  86         default:
  87                 ret = -EINVAL;
  88         }
  89
  90         if (!ret)
  91                 dev_info(drvdata->dev, "TMC read start\n");
  92
  93         return ret;
  94 }
  95
  96 static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
  97 {
  98         int ret = 0;
  99
 100         switch (drvdata->config_type) {
 101         case TMC_CONFIG_TYPE_ETB:
 102         case TMC_CONFIG_TYPE_ETF:
 103                 ret = tmc_read_unprepare_etb(drvdata);
 104                 break;
 105         case TMC_CONFIG_TYPE_ETR:
 106                 ret = tmc_read_unprepare_etr(drvdata);
 107                 break;
 108         default:
 109                 ret = -EINVAL;
 110         }
 111
 112         if (!ret)
 113                 dev_info(drvdata->dev, "TMC read end\n");
 114
 115         return ret;
 116 }
 117
 118 static int tmc_open(struct inode *inode, struct file *file)
 119 {
 120         int ret;
 121         struct tmc_drvdata *drvdata = container_of(file->private_data,
 122                                                    struct tmc_drvdata, miscdev);
 123
 124         ret = tmc_read_prepare(drvdata);
 125         if (ret)
 126                 return ret;
 127
 128         nonseekable_open(inode, file);
 129
 130         dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
 131         return 0;
 132 }
 133
 134 static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
 135                         loff_t *ppos)
 136 {
 137         struct tmc_drvdata *drvdata = container_of(file->private_data,
 138                                                    struct tmc_drvdata, miscdev);
 139         char *bufp = drvdata->buf + *ppos;
 140
 141         if (*ppos + len > drvdata->len)
 142                 len = drvdata->len - *ppos;
 143
 144         if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
 145                 if (bufp == (char *)(drvdata->vaddr + drvdata->size))
 146                         bufp = drvdata->vaddr;
 147                 else if (bufp > (char *)(drvdata->vaddr + drvdata->size))
 148                         bufp -= drvdata->size;
 149                 if ((bufp + len) > (char *)(drvdata->vaddr + drvdata->size))
 150                         len = (char *)(drvdata->vaddr + drvdata->size) - bufp;
 151         }
 152
 153         if (copy_to_user(data, bufp, len)) {
 154                 dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
 155                 return -EFAULT;
 156         }
 157
 158         *ppos += len;
 159
 160         dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
 161                 __func__, len, (int)(drvdata->len - *ppos));
 162         return len;
 163 }
 164
 165 static int tmc_release(struct inode *inode, struct file *file)
 166 {
 167         int ret;
 168         struct tmc_drvdata *drvdata = container_of(file->private_data,
 169                                                    struct tmc_drvdata, miscdev);
 170
 171         ret = tmc_read_unprepare(drvdata);
 172         if (ret)
 173                 return ret;
 174
 175         dev_dbg(drvdata->dev, "%s: released\n", __func__);
 176         return 0;
 177 }
 178
 179 static const struct file_operations tmc_fops = {
 180         .owner          = THIS_MODULE,
 181         .open           = tmc_open,
 182         .read           = tmc_read,
 183         .release        = tmc_release,
 184         .llseek         = no_llseek,
 185 };
 186
 187 static enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
 188 {
 189         enum tmc_mem_intf_width memwidth;
 190
 191         /*
 192          * Excerpt from the TRM:
 193          *
 194          * DEVID::MEMWIDTH[10:8]
 195          * 0x2 Memory interface databus is 32 bits wide.
 196          * 0x3 Memory interface databus is 64 bits wide.
 197          * 0x4 Memory interface databus is 128 bits wide.
 198          * 0x5 Memory interface databus is 256 bits wide.
 199          */
 200         switch (BMVAL(devid, 8, 10)) {
 201         case 0x2:
 202                 memwidth = TMC_MEM_INTF_WIDTH_32BITS;
 203                 break;
 204         case 0x3:
 205                 memwidth = TMC_MEM_INTF_WIDTH_64BITS;
 206                 break;
 207         case 0x4:
 208                 memwidth = TMC_MEM_INTF_WIDTH_128BITS;
 209                 break;
 210         case 0x5:
 211                 memwidth = TMC_MEM_INTF_WIDTH_256BITS;
 212                 break;
 213         default:
 214                 memwidth = 0;
 215         }
 216
 217         return memwidth;
 218 }
 219
 220 #define coresight_tmc_simple_func(name, offset)                 \
 221         coresight_simple_func(struct tmc_drvdata, NULL, name, offset)
 222
 223 coresight_tmc_simple_func(rsz, TMC_RSZ);
 224 coresight_tmc_simple_func(sts, TMC_STS);
 225 coresight_tmc_simple_func(rrp, TMC_RRP);
 226 coresight_tmc_simple_func(rwp, TMC_RWP);
 227 coresight_tmc_simple_func(trg, TMC_TRG);
 228 coresight_tmc_simple_func(ctl, TMC_CTL);
 229 coresight_tmc_simple_func(ffsr, TMC_FFSR);
 230 coresight_tmc_simple_func(ffcr, TMC_FFCR);
 231 coresight_tmc_simple_func(mode, TMC_MODE);
 232 coresight_tmc_simple_func(pscr, TMC_PSCR);
 233 coresight_tmc_simple_func(devid, CORESIGHT_DEVID);
 234
 235 static struct attribute *coresight_tmc_mgmt_attrs[] = {
 236         &dev_attr_rsz.attr,
 237         &dev_attr_sts.attr,
 238         &dev_attr_rrp.attr,
 239         &dev_attr_rwp.attr,
 240         &dev_attr_trg.attr,
 241         &dev_attr_ctl.attr,
 242         &dev_attr_ffsr.attr,
 243         &dev_attr_ffcr.attr,
 244         &dev_attr_mode.attr,
 245         &dev_attr_pscr.attr,
 246         &dev_attr_devid.attr,
 247         NULL,
 248 };
 249
 250 static ssize_t trigger_cntr_show(struct device *dev,
 251                                  struct device_attribute *attr, char *buf)
 252 {
 253         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 254         unsigned long val = drvdata->trigger_cntr;
 255
 256         return sprintf(buf, "%#lx\n", val);
 257 }
 258
 259 static ssize_t trigger_cntr_store(struct device *dev,
 260                              struct device_attribute *attr,
 261                              const char *buf, size_t size)
 262 {
 263         int ret;
 264         unsigned long val;
 265         struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 266
 267         ret = kstrtoul(buf, 16, &val);
 268         if (ret)
 269                 return ret;
 270
 271         drvdata->trigger_cntr = val;
 272         return size;
 273 }
 274 static DEVICE_ATTR_RW(trigger_cntr);
 275
 276 static struct attribute *coresight_tmc_attrs[] = {
 277         &dev_attr_trigger_cntr.attr,
 278         NULL,
 279 };
 280
 281 static const struct attribute_group coresight_tmc_group = {
 282         .attrs = coresight_tmc_attrs,
 283 };
 284
 285 static const struct attribute_group coresight_tmc_mgmt_group = {
 286         .attrs = coresight_tmc_mgmt_attrs,
 287         .name = "mgmt",
 288 };
 289
 290 const struct attribute_group *coresight_tmc_groups[] = {
 291         &coresight_tmc_group,
 292         &coresight_tmc_mgmt_group,
 293         NULL,
 294 };
 295
 296 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 297 {
 298         int ret = 0;
 299         u32 devid;
 300         void __iomem *base;
 301         struct device *dev = &adev->dev;
 302         struct coresight_platform_data *pdata = NULL;
 303         struct tmc_drvdata *drvdata;
 304         struct resource *res = &adev->res;
 305         struct coresight_desc desc = { 0 };
 306         struct device_node *np = adev->dev.of_node;
 307
 308         if (np) {
 309                 pdata = of_get_coresight_platform_data(dev, np);
 310                 if (IS_ERR(pdata)) {
 311                         ret = PTR_ERR(pdata);
 312                         goto out;
 313                 }
 314                 adev->dev.platform_data = pdata;
 315         }
 316
 317         ret = -ENOMEM;
 318         drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 319         if (!drvdata)
 320                 goto out;
 321
 322         drvdata->dev = &adev->dev;
 323         dev_set_drvdata(dev, drvdata);
 324
 325         /* Validity for the resource is already checked by the AMBA core */
 326         base = devm_ioremap_resource(dev, res);
 327         if (IS_ERR(base)) {
 328                 ret = PTR_ERR(base);
 329                 goto out;
 330         }
 331
 332         drvdata->base = base;
 333
 334         spin_lock_init(&drvdata->spinlock);
 335
 336         devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
 337         drvdata->config_type = BMVAL(devid, 6, 7);
 338         drvdata->memwidth = tmc_get_memwidth(devid);
 339
 340         if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
 341                 if (np)
 342                         ret = of_property_read_u32(np,
 343                                                    "arm,buffer-size",
 344                                                    &drvdata->size);
 345                 if (ret)
 346                         drvdata->size = SZ_1M;
 347         } else {
 348                 drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
 349         }
 350
 351         pm_runtime_put(&adev->dev);
 352
 353         desc.pdata = pdata;
 354         desc.dev = dev;
 355         desc.groups = coresight_tmc_groups;
 356
 357         if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
 358                 desc.type = CORESIGHT_DEV_TYPE_SINK;
 359                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 360                 desc.ops = &tmc_etb_cs_ops;
 361         } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
 362                 desc.type = CORESIGHT_DEV_TYPE_SINK;
 363                 desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 364                 desc.ops = &tmc_etr_cs_ops;
 365                 /*
 366                  * ETR configuration uses a 40-bit AXI master in place of
 367                  * the embedded SRAM of ETB/ETF.
 368                  */
 369                 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
 370                 if (ret)
 371                         goto out;
 372         } else {
 373                 desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
 374                 desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
 375                 desc.ops = &tmc_etf_cs_ops;
 376         }
 377
 378         drvdata->csdev = coresight_register(&desc);
 379         if (IS_ERR(drvdata->csdev)) {
 380                 ret = PTR_ERR(drvdata->csdev);
 381                 goto out;
 382         }
 383
 384         drvdata->miscdev.name = pdata->name;
 385         drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 386         drvdata->miscdev.fops = &tmc_fops;
 387         ret = misc_register(&drvdata->miscdev);
 388         if (ret)
 389                 coresight_unregister(drvdata->csdev);
 390 out:
 391         return ret;
 392 }
 393
 394 static struct amba_id tmc_ids[] = {
 395         {
 396                 .id     = 0x0003b961,
 397                 .mask   = 0x0003ffff,
 398         },
 399         { 0, 0},
 400 };
 401
 402 static struct amba_driver tmc_driver = {
 403         .drv = {
 404                 .name   = "coresight-tmc",
 405                 .owner  = THIS_MODULE,
 406                 .suppress_bind_attrs = true,
 407         },
 408         .probe          = tmc_probe,
 409         .id_table       = tmc_ids,
 410 };
 411 builtin_amba_driver(tmc_driver);