Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 1 | /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved. |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/clk.h> |
| 24 | #include <linux/of.h> |
| 25 | #include <linux/mutex.h> |
| 26 | #include <linux/coresight.h> |
| 27 | #include <soc/qcom/memory_dump.h> |
| 28 | |
| 29 | #include "coresight-priv.h" |
| 30 | |
| 31 | #define dbgui_writel(drvdata, val, off) \ |
| 32 | __raw_writel((val), drvdata->base + off) |
| 33 | #define dbgui_readl(drvdata, off) __raw_readl(drvdata->base + off) |
| 34 | |
| 35 | #define DBGUI_LOCK(drvdata) \ |
| 36 | do { \ |
| 37 | mb(); /* ensure configuration take effect before we lock it */ \ |
| 38 | dbgui_writel(drvdata, 0x0, CORESIGHT_LAR); \ |
| 39 | } while (0) |
| 40 | |
| 41 | #define DBGUI_UNLOCK(drvdata) \ |
| 42 | do { \ |
| 43 | dbgui_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \ |
| 44 | mb(); /* ensure unlock take effect before we configure */ \ |
| 45 | } while (0) |
| 46 | |
| 47 | /* DBGUI registers */ |
| 48 | #define DBGUI_SECURE (0x000) |
| 49 | #define DBGUI_CTL (0x004) |
| 50 | #define DBGUI_CTL_MASK (0x008) |
| 51 | #define DBGUI_SWTRIG (0x00C) |
| 52 | #define DBGUI_STATUS (0x010) |
| 53 | #define DBGUI_HWE_MASK (0x014) |
| 54 | #define DBGUI_CTR_VAL (0x018) |
| 55 | #define DBGUI_CTR_EN (0x01C) |
| 56 | #define DBGUI_NUM_REGS_RD (0x020) |
| 57 | #define DBGUI_ATB_REG (0x024) |
| 58 | |
| 59 | #define DBGUI_ADDRn(drvdata, n) (drvdata->addr_offset + 4*n) |
| 60 | #define DBGUI_DATAn(drvdata, n) (drvdata->data_offset + 4*n) |
| 61 | |
| 62 | #define DBGUI_TRIG_MASK 0xF0001 |
| 63 | #define DBGUI_MAX_ADDR_VAL 64 |
| 64 | #define DBGUI_TS_VALID BIT(15) |
| 65 | #define DBGUI_ATB_TRACE_EN BIT(0) |
| 66 | #define DBGUI_TIMER_CTR_OVERRIDE BIT(1) |
| 67 | #define DBGUI_TIMER_CTR_EN BIT(0) |
| 68 | |
| 69 | /* ATID for DBGUI */ |
| 70 | #define APB_ATID 50 |
| 71 | #define AHB_ATID 52 |
| 72 | |
| 73 | enum dbgui_trig_type { |
| 74 | DBGUI_TRIG_SW = BIT(0), |
| 75 | DBGUI_TRIG_TIMER = BIT(16), |
| 76 | DBGUI_TRIG_HWE = BIT(17), |
| 77 | DBGUI_TRIG_WDOG = BIT(18), |
| 78 | DBGUI_TRIG_CTI = BIT(19), |
| 79 | }; |
| 80 | |
| 81 | struct dbgui_drvdata { |
| 82 | void __iomem *base; |
| 83 | bool enable; |
| 84 | uint32_t addr_offset; |
| 85 | uint32_t data_offset; |
| 86 | uint32_t size; |
| 87 | struct device *dev; |
| 88 | struct coresight_device *csdev; |
| 89 | struct clk *clk; |
| 90 | struct mutex mutex; |
| 91 | uint32_t trig_mask; |
| 92 | bool capture_enable; |
| 93 | bool ts_enable; |
| 94 | bool timer_override_enable; |
| 95 | bool handoff_enable; |
| 96 | uint32_t nr_apb_regs; |
| 97 | uint32_t nr_ahb_regs; |
| 98 | uint32_t hwe_mask; |
| 99 | uint32_t addr_idx; |
| 100 | uint32_t timeout_val; |
| 101 | uint32_t addr_val[DBGUI_MAX_ADDR_VAL]; |
| 102 | uint32_t data_val[DBGUI_MAX_ADDR_VAL]; |
| 103 | struct msm_dump_data reg_data; |
| 104 | }; |
| 105 | |
| 106 | static struct dbgui_drvdata *dbgui_drvdata; |
| 107 | |
| 108 | static void dbgui_enable_atb_trace(struct dbgui_drvdata *drvdata) |
| 109 | { |
| 110 | uint32_t reg; |
| 111 | |
| 112 | reg = dbgui_readl(drvdata, DBGUI_ATB_REG); |
| 113 | reg |= DBGUI_ATB_TRACE_EN | APB_ATID << 8 | AHB_ATID << 1; |
| 114 | dbgui_writel(drvdata, reg, DBGUI_ATB_REG); |
| 115 | } |
| 116 | |
| 117 | static void dbgui_disable_atb_trace(struct dbgui_drvdata *drvdata) |
| 118 | { |
| 119 | uint32_t reg; |
| 120 | |
| 121 | reg = dbgui_readl(drvdata, DBGUI_ATB_REG); |
| 122 | reg &= ~DBGUI_ATB_TRACE_EN; |
| 123 | dbgui_writel(drvdata, reg, DBGUI_ATB_REG); |
| 124 | } |
| 125 | |
| 126 | static void dbgui_enable_timestamp(struct dbgui_drvdata *drvdata) |
| 127 | { |
| 128 | uint32_t reg; |
| 129 | |
| 130 | reg = dbgui_readl(drvdata, DBGUI_ATB_REG); |
| 131 | reg |= DBGUI_TS_VALID; |
| 132 | dbgui_writel(drvdata, reg, DBGUI_ATB_REG); |
| 133 | } |
| 134 | |
| 135 | static void dbgui_disable_timestamp(struct dbgui_drvdata *drvdata) |
| 136 | { |
| 137 | uint32_t reg; |
| 138 | |
| 139 | reg = dbgui_readl(drvdata, DBGUI_ATB_REG); |
| 140 | reg &= ~DBGUI_TS_VALID; |
| 141 | dbgui_writel(drvdata, reg, DBGUI_ATB_REG); |
| 142 | } |
| 143 | |
| 144 | static void dbgui_wait_for_pending_actions(struct dbgui_drvdata *drvdata) |
| 145 | { |
| 146 | int count; |
| 147 | uint32_t reg_val; |
| 148 | |
| 149 | for (count = TIMEOUT_US; reg_val = |
| 150 | dbgui_readl(drvdata, DBGUI_STATUS), |
| 151 | BMVAL(reg_val, 4, 7) != 0 |
| 152 | && BVAL(reg_val, 0) != 0 && count > 0; count--) |
| 153 | udelay(1); |
| 154 | |
| 155 | WARN(count == 0, |
| 156 | "timeout while waiting for pending action: STATUS %#x\n", |
| 157 | dbgui_readl(drvdata, DBGUI_STATUS)); |
| 158 | } |
| 159 | |
| 160 | static void __dbgui_capture_enable(struct dbgui_drvdata *drvdata) |
| 161 | { |
| 162 | int i; |
| 163 | uint32_t reg_val; |
| 164 | |
| 165 | DBGUI_UNLOCK(drvdata); |
| 166 | |
| 167 | dbgui_wait_for_pending_actions(drvdata); |
| 168 | dbgui_writel(drvdata, 0x1, DBGUI_SECURE); |
| 169 | dbgui_writel(drvdata, 0x1, DBGUI_CTL); |
| 170 | |
| 171 | reg_val = dbgui_readl(drvdata, DBGUI_NUM_REGS_RD); |
| 172 | reg_val &= ~0xFF; |
| 173 | reg_val |= (drvdata->nr_apb_regs | drvdata->nr_ahb_regs << 8); |
| 174 | dbgui_writel(drvdata, reg_val, DBGUI_NUM_REGS_RD); |
| 175 | |
| 176 | for (i = 0; i < drvdata->size; i++) { |
| 177 | if (drvdata->addr_val[i]) |
| 178 | dbgui_writel(drvdata, drvdata->addr_val[i], |
| 179 | DBGUI_ADDRn(drvdata, i)); |
| 180 | } |
| 181 | |
| 182 | if (!(drvdata->trig_mask & DBGUI_TRIG_TIMER) && drvdata->timeout_val) { |
| 183 | dbgui_writel(drvdata, drvdata->timeout_val, DBGUI_CTR_VAL); |
| 184 | |
| 185 | reg_val = dbgui_readl(drvdata, DBGUI_CTR_EN); |
| 186 | if (drvdata->timer_override_enable) |
| 187 | reg_val |= DBGUI_TIMER_CTR_OVERRIDE; |
| 188 | |
| 189 | reg_val |= DBGUI_TIMER_CTR_EN; |
| 190 | dbgui_writel(drvdata, reg_val, DBGUI_CTR_EN); |
| 191 | } |
| 192 | |
| 193 | if (!(drvdata->trig_mask & DBGUI_TRIG_HWE)) |
| 194 | dbgui_writel(drvdata, drvdata->hwe_mask, DBGUI_HWE_MASK); |
| 195 | |
| 196 | dbgui_writel(drvdata, drvdata->trig_mask, DBGUI_CTL_MASK); |
| 197 | |
| 198 | DBGUI_LOCK(drvdata); |
| 199 | }; |
| 200 | |
| 201 | static int dbgui_capture_enable(struct dbgui_drvdata *drvdata) |
| 202 | { |
| 203 | int ret = 0; |
| 204 | |
| 205 | mutex_lock(&drvdata->mutex); |
| 206 | if (drvdata->capture_enable) |
| 207 | goto out; |
| 208 | |
| 209 | if (drvdata->trig_mask == DBGUI_TRIG_MASK) { |
| 210 | ret = -EINVAL; |
| 211 | goto out; |
| 212 | } |
| 213 | |
| 214 | ret = clk_prepare_enable(drvdata->clk); |
| 215 | if (ret) |
| 216 | goto out; |
| 217 | |
| 218 | if (!drvdata->handoff_enable) |
| 219 | __dbgui_capture_enable(drvdata); |
| 220 | drvdata->capture_enable = true; |
| 221 | mutex_unlock(&drvdata->mutex); |
| 222 | |
| 223 | dev_info(drvdata->dev, "DebugUI capture enabled\n"); |
| 224 | return 0; |
| 225 | out: |
| 226 | mutex_unlock(&drvdata->mutex); |
| 227 | return ret; |
| 228 | } |
| 229 | |
| 230 | static void __dbgui_capture_disable(struct dbgui_drvdata *drvdata) |
| 231 | { |
| 232 | DBGUI_UNLOCK(drvdata); |
| 233 | |
| 234 | dbgui_wait_for_pending_actions(drvdata); |
| 235 | |
| 236 | /* mask all the triggers */ |
| 237 | dbgui_writel(drvdata, DBGUI_TRIG_MASK, DBGUI_CTL_MASK); |
| 238 | |
| 239 | DBGUI_LOCK(drvdata); |
| 240 | } |
| 241 | |
| 242 | static int dbgui_capture_disable(struct dbgui_drvdata *drvdata) |
| 243 | { |
| 244 | int ret = 0; |
| 245 | |
| 246 | mutex_lock(&drvdata->mutex); |
| 247 | if (!drvdata->capture_enable) |
| 248 | goto out; |
| 249 | |
| 250 | /* don't allow capture disable while its enabled as a trace source */ |
| 251 | if (drvdata->enable) { |
| 252 | ret = -EPERM; |
| 253 | goto out; |
| 254 | } |
| 255 | |
| 256 | __dbgui_capture_disable(drvdata); |
| 257 | clk_disable_unprepare(drvdata->clk); |
| 258 | drvdata->capture_enable = false; |
| 259 | mutex_unlock(&drvdata->mutex); |
| 260 | |
| 261 | dev_info(drvdata->dev, "DebugUI capture disabled\n"); |
| 262 | return 0; |
| 263 | out: |
| 264 | mutex_unlock(&drvdata->mutex); |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | static int __dbgui_enable(struct dbgui_drvdata *drvdata) |
| 269 | { |
| 270 | DBGUI_UNLOCK(drvdata); |
| 271 | |
| 272 | dbgui_enable_atb_trace(drvdata); |
| 273 | if (drvdata->ts_enable) |
| 274 | dbgui_enable_timestamp(drvdata); |
| 275 | |
| 276 | DBGUI_LOCK(drvdata); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static int dbgui_enable(struct coresight_device *csdev, |
| 281 | struct perf_event *event, u32 mode) |
| 282 | { |
| 283 | struct dbgui_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 284 | |
| 285 | mutex_lock(&drvdata->mutex); |
| 286 | |
| 287 | if (!drvdata->capture_enable) { |
| 288 | mutex_unlock(&drvdata->mutex); |
| 289 | return -EPERM; |
| 290 | } |
| 291 | |
| 292 | __dbgui_enable(drvdata); |
| 293 | drvdata->enable = true; |
| 294 | mutex_unlock(&drvdata->mutex); |
| 295 | |
| 296 | dev_info(drvdata->dev, "DebugUI tracing enabled\n"); |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | static void __dbgui_disable(struct dbgui_drvdata *drvdata) |
| 301 | { |
| 302 | DBGUI_UNLOCK(drvdata); |
| 303 | |
| 304 | dbgui_disable_atb_trace(drvdata); |
| 305 | if (drvdata->ts_enable) |
| 306 | dbgui_disable_timestamp(drvdata); |
| 307 | |
| 308 | DBGUI_LOCK(drvdata); |
| 309 | } |
| 310 | |
| 311 | static void dbgui_disable(struct coresight_device *csdev, |
| 312 | struct perf_event *event) |
| 313 | { |
| 314 | struct dbgui_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| 315 | |
| 316 | mutex_lock(&drvdata->mutex); |
| 317 | __dbgui_disable(drvdata); |
| 318 | drvdata->enable = false; |
| 319 | mutex_unlock(&drvdata->mutex); |
| 320 | |
| 321 | dev_info(drvdata->dev, "DebugUI tracing disabled\n"); |
| 322 | } |
| 323 | |
| 324 | static int dbgui_trace_id(struct coresight_device *csdev) |
| 325 | { |
| 326 | return 0; |
| 327 | } |
| 328 | |
| 329 | static const struct coresight_ops_source dbgui_source_ops = { |
| 330 | .trace_id = dbgui_trace_id, |
| 331 | .enable = dbgui_enable, |
| 332 | .disable = dbgui_disable, |
| 333 | }; |
| 334 | |
| 335 | /* DebugUI may already be configured for capture, so retrieve current state */ |
| 336 | static void dbgui_handoff(struct dbgui_drvdata *drvdata) |
| 337 | { |
| 338 | uint32_t val; |
| 339 | int i; |
| 340 | |
| 341 | drvdata->handoff_enable = true; |
| 342 | |
| 343 | drvdata->trig_mask = dbgui_readl(drvdata, DBGUI_CTL_MASK); |
| 344 | drvdata->hwe_mask = dbgui_readl(drvdata, DBGUI_HWE_MASK); |
| 345 | drvdata->timeout_val = dbgui_readl(drvdata, DBGUI_CTR_VAL); |
| 346 | |
| 347 | val = dbgui_readl(drvdata, DBGUI_NUM_REGS_RD); |
| 348 | drvdata->nr_ahb_regs = (val >> 8) & 0xF; |
| 349 | drvdata->nr_apb_regs = val & 0xF; |
| 350 | |
| 351 | val = dbgui_readl(drvdata, DBGUI_ATB_REG); |
| 352 | if (val & DBGUI_TS_VALID) |
| 353 | drvdata->ts_enable = true; |
| 354 | |
| 355 | val = dbgui_readl(drvdata, DBGUI_CTR_EN); |
| 356 | if (val & DBGUI_TIMER_CTR_OVERRIDE) |
| 357 | drvdata->timer_override_enable = true; |
| 358 | |
| 359 | for (i = 0; i < drvdata->size; i++) |
| 360 | drvdata->addr_val[i] = dbgui_readl(drvdata, |
| 361 | DBGUI_ADDRn(drvdata, i)); |
| 362 | |
| 363 | if (drvdata->trig_mask != DBGUI_TRIG_MASK) |
| 364 | dbgui_capture_enable(drvdata); |
| 365 | |
| 366 | drvdata->handoff_enable = false; |
| 367 | } |
| 368 | |
| 369 | static const struct coresight_ops dbgui_cs_ops = { |
| 370 | .source_ops = &dbgui_source_ops, |
| 371 | }; |
| 372 | |
| 373 | static ssize_t dbgui_store_trig_mask(struct device *dev, |
| 374 | struct device_attribute *attr, |
| 375 | const char *buf, |
| 376 | size_t size) |
| 377 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 378 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 379 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 380 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 381 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 382 | return -EINVAL; |
| 383 | |
| 384 | mutex_lock(&drvdata->mutex); |
| 385 | drvdata->trig_mask = val & DBGUI_TRIG_MASK; |
| 386 | mutex_unlock(&drvdata->mutex); |
| 387 | |
| 388 | return size; |
| 389 | } |
| 390 | |
| 391 | static ssize_t dbgui_show_trig_mask(struct device *dev, |
| 392 | struct device_attribute *attr, char *buf) |
| 393 | { |
| 394 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 395 | |
| 396 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->trig_mask); |
| 397 | }; |
| 398 | static DEVICE_ATTR(trig_mask, 0644, |
| 399 | dbgui_show_trig_mask, dbgui_store_trig_mask); |
| 400 | |
| 401 | static ssize_t dbgui_store_timer_override_enable(struct device *dev, |
| 402 | struct device_attribute *attr, |
| 403 | const char *buf, |
| 404 | size_t size) |
| 405 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 406 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 407 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 408 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 409 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 410 | return -EINVAL; |
| 411 | |
| 412 | mutex_lock(&drvdata->mutex); |
| 413 | drvdata->timer_override_enable = val ? true : false; |
| 414 | mutex_unlock(&drvdata->mutex); |
| 415 | |
| 416 | return size; |
| 417 | } |
| 418 | |
| 419 | static ssize_t dbgui_show_timer_override_enable(struct device *dev, |
| 420 | struct device_attribute *attr, |
| 421 | char *buf) |
| 422 | { |
| 423 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 424 | |
| 425 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", |
| 426 | drvdata->timer_override_enable); |
| 427 | }; |
| 428 | static DEVICE_ATTR(timer_override_enable, 0644, |
| 429 | dbgui_show_timer_override_enable, |
| 430 | dbgui_store_timer_override_enable); |
| 431 | |
| 432 | static ssize_t dbgui_store_ts_enable(struct device *dev, |
| 433 | struct device_attribute *attr, |
| 434 | const char *buf, |
| 435 | size_t size) |
| 436 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 437 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 438 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 439 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 440 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 441 | return -EINVAL; |
| 442 | |
| 443 | mutex_lock(&drvdata->mutex); |
| 444 | drvdata->ts_enable = val ? true : false; |
| 445 | mutex_unlock(&drvdata->mutex); |
| 446 | |
| 447 | return size; |
| 448 | } |
| 449 | |
| 450 | static ssize_t dbgui_show_ts_enable(struct device *dev, |
| 451 | struct device_attribute *attr, |
| 452 | char *buf) |
| 453 | { |
| 454 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 455 | |
| 456 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->ts_enable); |
| 457 | }; |
| 458 | static DEVICE_ATTR(ts_enable, 0644, |
| 459 | dbgui_show_ts_enable, dbgui_store_ts_enable); |
| 460 | |
| 461 | static ssize_t dbgui_store_hwe_mask(struct device *dev, |
| 462 | struct device_attribute *attr, |
| 463 | const char *buf, |
| 464 | size_t size) |
| 465 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 466 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 467 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 468 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 469 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 470 | return -EINVAL; |
| 471 | |
| 472 | mutex_lock(&drvdata->mutex); |
| 473 | drvdata->hwe_mask = val; |
| 474 | mutex_unlock(&drvdata->mutex); |
| 475 | |
| 476 | return size; |
| 477 | } |
| 478 | |
| 479 | static ssize_t dbgui_show_hwe_mask(struct device *dev, |
| 480 | struct device_attribute *attr, |
| 481 | char *buf) |
| 482 | { |
| 483 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 484 | |
| 485 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->hwe_mask); |
| 486 | }; |
| 487 | static DEVICE_ATTR(hwe_mask, 0644, |
| 488 | dbgui_show_hwe_mask, dbgui_store_hwe_mask); |
| 489 | |
| 490 | static ssize_t dbgui_store_sw_trig(struct device *dev, |
| 491 | struct device_attribute *attr, |
| 492 | const char *buf, |
| 493 | size_t size) |
| 494 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 495 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 496 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 497 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 498 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 499 | return -EINVAL; |
| 500 | |
| 501 | if (!val) |
| 502 | return 0; |
| 503 | |
| 504 | mutex_lock(&drvdata->mutex); |
| 505 | if (!drvdata->capture_enable) { |
| 506 | mutex_unlock(&drvdata->mutex); |
| 507 | return -EINVAL; |
| 508 | } |
| 509 | |
| 510 | dbgui_wait_for_pending_actions(drvdata); |
| 511 | DBGUI_UNLOCK(drvdata); |
| 512 | |
| 513 | /* clear status register and free the sequencer */ |
| 514 | dbgui_writel(drvdata, 0x1, DBGUI_CTL); |
| 515 | |
| 516 | /* fire a software trigger */ |
| 517 | dbgui_writel(drvdata, 0x1, DBGUI_SWTRIG); |
| 518 | |
| 519 | DBGUI_LOCK(drvdata); |
| 520 | mutex_unlock(&drvdata->mutex); |
| 521 | |
| 522 | return size; |
| 523 | } |
| 524 | static DEVICE_ATTR(sw_trig, 0200, NULL, dbgui_store_sw_trig); |
| 525 | |
| 526 | static ssize_t dbgui_store_nr_ahb_regs(struct device *dev, |
| 527 | struct device_attribute *attr, |
| 528 | const char *buf, |
| 529 | size_t size) |
| 530 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 531 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 532 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 533 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 534 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 535 | return -EINVAL; |
| 536 | |
| 537 | if (val > drvdata->size) |
| 538 | return -EINVAL; |
| 539 | |
| 540 | mutex_lock(&drvdata->mutex); |
| 541 | drvdata->nr_ahb_regs = val; |
| 542 | |
| 543 | /* |
| 544 | * Please make sure nr_ahb_regs + nr_apb_regs isn't greater than |
| 545 | * drvdata->size. If sum is greater than size, The last setting |
| 546 | * of nr_ahb_regs or nr_apb_regs takes high priority. |
| 547 | */ |
| 548 | if (drvdata->nr_apb_regs + drvdata->nr_ahb_regs > drvdata->size) |
| 549 | drvdata->nr_apb_regs = drvdata->size - |
| 550 | drvdata->nr_ahb_regs; |
| 551 | |
| 552 | mutex_unlock(&drvdata->mutex); |
| 553 | |
| 554 | return size; |
| 555 | } |
| 556 | |
| 557 | static ssize_t dbgui_show_nr_ahb_regs(struct device *dev, |
| 558 | struct device_attribute *attr, char *buf) |
| 559 | { |
| 560 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 561 | |
| 562 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->nr_ahb_regs); |
| 563 | }; |
| 564 | static DEVICE_ATTR(nr_ahb_regs, 0644, dbgui_show_nr_ahb_regs, |
| 565 | dbgui_store_nr_ahb_regs); |
| 566 | |
| 567 | static ssize_t dbgui_store_nr_apb_regs(struct device *dev, |
| 568 | struct device_attribute *attr, |
| 569 | const char *buf, |
| 570 | size_t size) |
| 571 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 572 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 573 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 574 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 575 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 576 | return -EINVAL; |
| 577 | |
| 578 | if (val > drvdata->size) |
| 579 | return -EINVAL; |
| 580 | |
| 581 | mutex_lock(&drvdata->mutex); |
| 582 | drvdata->nr_apb_regs = val; |
| 583 | |
| 584 | if (drvdata->nr_apb_regs + drvdata->nr_ahb_regs > drvdata->size) |
| 585 | drvdata->nr_ahb_regs = drvdata->size - |
| 586 | drvdata->nr_apb_regs; |
| 587 | |
| 588 | mutex_unlock(&drvdata->mutex); |
| 589 | |
| 590 | return size; |
| 591 | } |
| 592 | |
| 593 | static ssize_t dbgui_show_nr_apb_regs(struct device *dev, |
| 594 | struct device_attribute *attr, |
| 595 | char *buf) |
| 596 | { |
| 597 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 598 | |
| 599 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->nr_apb_regs); |
| 600 | }; |
| 601 | static DEVICE_ATTR(nr_apb_regs, 0644, dbgui_show_nr_apb_regs, |
| 602 | dbgui_store_nr_apb_regs); |
| 603 | |
| 604 | static ssize_t dbgui_show_size(struct device *dev, |
| 605 | struct device_attribute *attr, char *buf) |
| 606 | { |
| 607 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 608 | |
| 609 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->size); |
| 610 | }; |
| 611 | static DEVICE_ATTR(size, 0644, dbgui_show_size, NULL); |
| 612 | |
| 613 | static ssize_t dbgui_store_timeout_val(struct device *dev, |
| 614 | struct device_attribute *attr, |
| 615 | const char *buf, |
| 616 | size_t size) |
| 617 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 618 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 619 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 620 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 621 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 622 | return -EINVAL; |
| 623 | |
| 624 | mutex_lock(&drvdata->mutex); |
| 625 | drvdata->timeout_val = val; |
| 626 | mutex_unlock(&drvdata->mutex); |
| 627 | |
| 628 | return size; |
| 629 | } |
| 630 | |
| 631 | static ssize_t dbgui_show_timeout_val(struct device *dev, |
| 632 | struct device_attribute *attr, char *buf) |
| 633 | { |
| 634 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 635 | |
| 636 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->timeout_val); |
| 637 | }; |
| 638 | static DEVICE_ATTR(timeout_val, 0644, dbgui_show_timeout_val, |
| 639 | dbgui_store_timeout_val); |
| 640 | |
| 641 | static ssize_t dbgui_store_addr_idx(struct device *dev, |
| 642 | struct device_attribute *attr, |
| 643 | const char *buf, |
| 644 | size_t size) |
| 645 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 646 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 647 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 648 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 649 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 650 | return -EINVAL; |
| 651 | |
| 652 | if (val >= drvdata->size) |
| 653 | return -EINVAL; |
| 654 | |
| 655 | mutex_lock(&drvdata->mutex); |
| 656 | drvdata->addr_idx = val; |
| 657 | mutex_unlock(&drvdata->mutex); |
| 658 | |
| 659 | return size; |
| 660 | } |
| 661 | |
| 662 | static ssize_t dbgui_show_addr_idx(struct device *dev, |
| 663 | struct device_attribute *attr, char *buf) |
| 664 | { |
| 665 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 666 | |
| 667 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->addr_idx); |
| 668 | }; |
| 669 | static DEVICE_ATTR(addr_idx, 0644, dbgui_show_addr_idx, |
| 670 | dbgui_store_addr_idx); |
| 671 | |
| 672 | static ssize_t dbgui_store_addr_val(struct device *dev, |
| 673 | struct device_attribute *attr, |
| 674 | const char *buf, |
| 675 | size_t size) |
| 676 | { |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 677 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 678 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 679 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 680 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 681 | return -EINVAL; |
| 682 | |
| 683 | mutex_lock(&drvdata->mutex); |
| 684 | drvdata->addr_val[drvdata->addr_idx] = val; |
| 685 | mutex_unlock(&drvdata->mutex); |
| 686 | |
| 687 | return size; |
| 688 | } |
| 689 | |
| 690 | static ssize_t dbgui_show_addr_val(struct device *dev, |
| 691 | struct device_attribute *attr, char *buf) |
| 692 | { |
| 693 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 694 | ssize_t len = 0; |
| 695 | int i; |
| 696 | |
| 697 | mutex_lock(&drvdata->mutex); |
| 698 | for (i = 0; i < drvdata->size; i++) |
| 699 | len += scnprintf(buf + len, PAGE_SIZE - len, |
| 700 | "[%02d]:0x%08x%s\n", |
| 701 | i, drvdata->addr_val[i], |
| 702 | drvdata->addr_idx == i ? |
| 703 | " *" : ""); |
| 704 | mutex_unlock(&drvdata->mutex); |
| 705 | |
| 706 | return len; |
| 707 | }; |
| 708 | static DEVICE_ATTR(addr_val, 0644, dbgui_show_addr_val, |
| 709 | dbgui_store_addr_val); |
| 710 | |
| 711 | static ssize_t dbgui_show_data_val(struct device *dev, |
| 712 | struct device_attribute *attr, char *buf) |
| 713 | { |
| 714 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 715 | ssize_t len = 0; |
| 716 | int i; |
| 717 | uint32_t val, trig_mask; |
| 718 | |
| 719 | if (!drvdata->capture_enable) |
| 720 | return 0; |
| 721 | |
| 722 | dbgui_wait_for_pending_actions(drvdata); |
| 723 | |
| 724 | mutex_lock(&drvdata->mutex); |
| 725 | |
| 726 | DBGUI_UNLOCK(drvdata); |
| 727 | |
| 728 | /* |
| 729 | * If the timer trigger is enabled, data might change while we read it. |
| 730 | * We mask all the trggers here to avoid this. |
| 731 | */ |
| 732 | trig_mask = dbgui_readl(drvdata, DBGUI_CTL_MASK); |
| 733 | dbgui_writel(drvdata, DBGUI_TRIG_MASK, DBGUI_CTL_MASK); |
| 734 | |
| 735 | for (i = 0; i < drvdata->size; i++) { |
| 736 | val = dbgui_readl(drvdata, DBGUI_DATAn(drvdata, i)); |
| 737 | drvdata->data_val[i] = val; |
| 738 | len += scnprintf(buf + len, PAGE_SIZE - len, |
| 739 | "[%02d]:0x%08x\n", |
| 740 | i, drvdata->data_val[i]); |
| 741 | } |
| 742 | dbgui_writel(drvdata, trig_mask, DBGUI_CTL_MASK); |
| 743 | |
| 744 | DBGUI_LOCK(drvdata); |
| 745 | |
| 746 | mutex_unlock(&drvdata->mutex); |
| 747 | |
| 748 | return len; |
| 749 | }; |
| 750 | static DEVICE_ATTR(data_val, 0444, dbgui_show_data_val, NULL); |
| 751 | |
| 752 | static ssize_t dbgui_store_capture_enable(struct device *dev, |
| 753 | struct device_attribute *attr, |
| 754 | const char *buf, |
| 755 | size_t size) |
| 756 | { |
| 757 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 758 | uint32_t ret; |
| 759 | unsigned long val; |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 760 | |
Mukesh Ojha | 4949cde | 2018-02-21 19:17:54 +0530 | [diff] [blame] | 761 | if (kstrtoul(buf, 16, &val)) |
Mukesh Ojha | 4350ecb | 2017-11-30 19:24:55 +0530 | [diff] [blame] | 762 | return -EINVAL; |
| 763 | |
| 764 | if (val) |
| 765 | ret = dbgui_capture_enable(drvdata); |
| 766 | else |
| 767 | ret = dbgui_capture_disable(drvdata); |
| 768 | |
| 769 | if (ret) |
| 770 | return ret; |
| 771 | return size; |
| 772 | } |
| 773 | |
| 774 | static ssize_t dbgui_show_capture_enable(struct device *dev, |
| 775 | struct device_attribute *attr, char *buf) |
| 776 | { |
| 777 | struct dbgui_drvdata *drvdata = dev_get_drvdata(dev->parent); |
| 778 | |
| 779 | return scnprintf(buf, PAGE_SIZE, "0x%x\n", drvdata->capture_enable); |
| 780 | }; |
| 781 | static DEVICE_ATTR(capture_enable, 0644, |
| 782 | dbgui_show_capture_enable, |
| 783 | dbgui_store_capture_enable); |
| 784 | |
| 785 | static struct attribute *dbgui_attrs[] = { |
| 786 | &dev_attr_sw_trig.attr, |
| 787 | &dev_attr_trig_mask.attr, |
| 788 | &dev_attr_capture_enable.attr, |
| 789 | &dev_attr_ts_enable.attr, |
| 790 | &dev_attr_hwe_mask.attr, |
| 791 | &dev_attr_timer_override_enable.attr, |
| 792 | &dev_attr_size.attr, |
| 793 | &dev_attr_nr_ahb_regs.attr, |
| 794 | &dev_attr_nr_apb_regs.attr, |
| 795 | &dev_attr_timeout_val.attr, |
| 796 | &dev_attr_addr_idx.attr, |
| 797 | &dev_attr_addr_val.attr, |
| 798 | &dev_attr_data_val.attr, |
| 799 | NULL, |
| 800 | }; |
| 801 | |
| 802 | static struct attribute_group dbgui_attr_grp = { |
| 803 | .attrs = dbgui_attrs, |
| 804 | }; |
| 805 | |
| 806 | static const struct attribute_group *dbgui_attr_grps[] = { |
| 807 | &dbgui_attr_grp, |
| 808 | NULL, |
| 809 | }; |
| 810 | |
| 811 | static int dbgui_probe(struct platform_device *pdev) |
| 812 | { |
| 813 | int ret; |
| 814 | struct device *dev = &pdev->dev; |
| 815 | struct coresight_platform_data *pdata; |
| 816 | struct dbgui_drvdata *drvdata; |
| 817 | struct resource *res; |
| 818 | struct coresight_desc *desc; |
| 819 | struct msm_dump_entry dump_entry; |
| 820 | void *baddr; |
| 821 | |
| 822 | pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node); |
| 823 | if (IS_ERR(pdata)) |
| 824 | return PTR_ERR(pdata); |
| 825 | pdev->dev.platform_data = pdata; |
| 826 | |
| 827 | drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| 828 | if (!drvdata) |
| 829 | return -ENOMEM; |
| 830 | |
| 831 | drvdata->dev = &pdev->dev; |
| 832 | platform_set_drvdata(pdev, drvdata); |
| 833 | mutex_init(&drvdata->mutex); |
| 834 | |
| 835 | drvdata->clk = devm_clk_get(dev, "apb_pclk"); |
| 836 | if (IS_ERR(drvdata->clk)) |
| 837 | return PTR_ERR(drvdata->clk); |
| 838 | |
| 839 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbgui-base"); |
| 840 | if (!res) { |
| 841 | dev_info(dev, "DBGUI base not specified\n"); |
| 842 | return -ENODEV; |
| 843 | } |
| 844 | |
| 845 | drvdata->base = devm_ioremap(dev, res->start, resource_size(res)); |
| 846 | if (!drvdata->base) |
| 847 | return -ENOMEM; |
| 848 | |
| 849 | ret = clk_prepare_enable(drvdata->clk); |
| 850 | if (ret) |
| 851 | return ret; |
| 852 | |
| 853 | if (!coresight_authstatus_enabled(drvdata->base)) |
| 854 | goto err; |
| 855 | |
| 856 | clk_disable_unprepare(drvdata->clk); |
| 857 | |
| 858 | baddr = devm_kzalloc(dev, resource_size(res), GFP_KERNEL); |
| 859 | if (baddr) { |
| 860 | drvdata->reg_data.addr = virt_to_phys(baddr); |
| 861 | drvdata->reg_data.len = resource_size(res); |
| 862 | dump_entry.id = MSM_DUMP_DATA_DBGUI_REG; |
| 863 | dump_entry.addr = virt_to_phys(&drvdata->reg_data); |
| 864 | ret = msm_dump_data_register(MSM_DUMP_TABLE_APPS, |
| 865 | &dump_entry); |
| 866 | if (ret) { |
| 867 | devm_kfree(dev, baddr); |
| 868 | dev_err(dev, "DBGUI REG dump setup failed\n"); |
| 869 | } |
| 870 | } else { |
| 871 | dev_err(dev, "DBGUI REG dump allocation failed\n"); |
| 872 | } |
| 873 | |
| 874 | ret = of_property_read_u32(pdev->dev.of_node, |
| 875 | "qcom,dbgui-addr-offset", |
| 876 | &drvdata->addr_offset); |
| 877 | if (ret) |
| 878 | return -EINVAL; |
| 879 | |
| 880 | ret = of_property_read_u32(pdev->dev.of_node, |
| 881 | "qcom,dbgui-data-offset", |
| 882 | &drvdata->data_offset); |
| 883 | if (ret) |
| 884 | return -EINVAL; |
| 885 | |
| 886 | if (drvdata->addr_offset >= resource_size(res) |
| 887 | || drvdata->data_offset >= resource_size(res)) { |
| 888 | dev_err(dev, "Invalid address or data offset\n"); |
| 889 | return -EINVAL; |
| 890 | } |
| 891 | |
| 892 | ret = of_property_read_u32(pdev->dev.of_node, |
| 893 | "qcom,dbgui-size", |
| 894 | &drvdata->size); |
| 895 | if (ret || drvdata->size > DBGUI_MAX_ADDR_VAL) |
| 896 | return -EINVAL; |
| 897 | |
| 898 | ret = clk_prepare_enable(drvdata->clk); |
| 899 | if (ret) |
| 900 | return ret; |
| 901 | |
| 902 | dbgui_handoff(drvdata); |
| 903 | clk_disable_unprepare(drvdata->clk); |
| 904 | /* |
| 905 | * To provide addr_offset, data_offset and size via a global variable. |
| 906 | * NOTE: Only single dbgui device is supported now. |
| 907 | */ |
| 908 | dbgui_drvdata = drvdata; |
| 909 | |
| 910 | desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); |
| 911 | if (!desc) |
| 912 | return -ENOMEM; |
| 913 | desc->type = CORESIGHT_DEV_TYPE_SOURCE; |
| 914 | desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC; |
| 915 | desc->ops = &dbgui_cs_ops; |
| 916 | desc->pdata = pdev->dev.platform_data; |
| 917 | desc->dev = &pdev->dev; |
| 918 | desc->groups = dbgui_attr_grps; |
| 919 | drvdata->csdev = coresight_register(desc); |
| 920 | if (IS_ERR(drvdata->csdev)) |
| 921 | return PTR_ERR(drvdata->csdev); |
| 922 | |
| 923 | dev_info(dev, "DebugUI initializaed\n"); |
| 924 | return 0; |
| 925 | err: |
| 926 | clk_disable_unprepare(drvdata->clk); |
| 927 | return -EPERM; |
| 928 | } |
| 929 | |
| 930 | static int dbgui_remove(struct platform_device *pdev) |
| 931 | { |
| 932 | struct dbgui_drvdata *drvdata = platform_get_drvdata(pdev); |
| 933 | |
| 934 | coresight_unregister(drvdata->csdev); |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | static const struct of_device_id dbgui_match[] = { |
| 939 | {.compatible = "qcom,coresight-dbgui"}, |
| 940 | {} |
| 941 | }; |
| 942 | |
| 943 | static struct platform_driver dbgui_driver = { |
| 944 | .probe = dbgui_probe, |
| 945 | .remove = dbgui_remove, |
| 946 | .driver = { |
| 947 | .name = "coresight-dbgui", |
| 948 | .owner = THIS_MODULE, |
| 949 | .of_match_table = dbgui_match, |
| 950 | }, |
| 951 | }; |
| 952 | |
| 953 | static int __init dbgui_init(void) |
| 954 | { |
| 955 | return platform_driver_register(&dbgui_driver); |
| 956 | } |
| 957 | module_init(dbgui_init); |
| 958 | |
| 959 | static void __exit dbgui_exit(void) |
| 960 | { |
| 961 | return platform_driver_unregister(&dbgui_driver); |
| 962 | } |
| 963 | module_exit(dbgui_exit); |
| 964 | |
| 965 | MODULE_LICENSE("GPL v2"); |
| 966 | MODULE_DESCRIPTION("CoreSight DebugUI driver"); |