Mian Yousaf Kaukab | f91eea4 | 2015-04-29 22:08:59 +0200 | [diff] [blame^] | 1 | /** |
| 2 | * debugfs.c - Designware USB2 DRD controller debugfs |
| 3 | * |
| 4 | * Copyright (C) 2015 Intel Corporation |
| 5 | * Mian Yousaf Kaukab <yousaf.kaukab@intel.com> |
| 6 | * |
| 7 | * This program is free software: you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 of |
| 9 | * the License as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/debugfs.h> |
| 19 | #include <linux/seq_file.h> |
| 20 | #include <linux/uaccess.h> |
| 21 | |
| 22 | #include "core.h" |
| 23 | #include "debug.h" |
| 24 | |
| 25 | #if IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) || \ |
| 26 | IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE) |
| 27 | /** |
| 28 | * testmode_write - debugfs: change usb test mode |
| 29 | * @seq: The seq file to write to. |
| 30 | * @v: Unused parameter. |
| 31 | * |
| 32 | * This debugfs entry modify the current usb test mode. |
| 33 | */ |
| 34 | static ssize_t testmode_write(struct file *file, const char __user *ubuf, size_t |
| 35 | count, loff_t *ppos) |
| 36 | { |
| 37 | struct seq_file *s = file->private_data; |
| 38 | struct dwc2_hsotg *hsotg = s->private; |
| 39 | unsigned long flags; |
| 40 | u32 testmode = 0; |
| 41 | char buf[32]; |
| 42 | |
| 43 | if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) |
| 44 | return -EFAULT; |
| 45 | |
| 46 | if (!strncmp(buf, "test_j", 6)) |
| 47 | testmode = TEST_J; |
| 48 | else if (!strncmp(buf, "test_k", 6)) |
| 49 | testmode = TEST_K; |
| 50 | else if (!strncmp(buf, "test_se0_nak", 12)) |
| 51 | testmode = TEST_SE0_NAK; |
| 52 | else if (!strncmp(buf, "test_packet", 11)) |
| 53 | testmode = TEST_PACKET; |
| 54 | else if (!strncmp(buf, "test_force_enable", 17)) |
| 55 | testmode = TEST_FORCE_EN; |
| 56 | else |
| 57 | testmode = 0; |
| 58 | |
| 59 | spin_lock_irqsave(&hsotg->lock, flags); |
| 60 | s3c_hsotg_set_test_mode(hsotg, testmode); |
| 61 | spin_unlock_irqrestore(&hsotg->lock, flags); |
| 62 | return count; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * testmode_show - debugfs: show usb test mode state |
| 67 | * @seq: The seq file to write to. |
| 68 | * @v: Unused parameter. |
| 69 | * |
| 70 | * This debugfs entry shows which usb test mode is currently enabled. |
| 71 | */ |
| 72 | static int testmode_show(struct seq_file *s, void *unused) |
| 73 | { |
| 74 | struct dwc2_hsotg *hsotg = s->private; |
| 75 | unsigned long flags; |
| 76 | int dctl; |
| 77 | |
| 78 | spin_lock_irqsave(&hsotg->lock, flags); |
| 79 | dctl = readl(hsotg->regs + DCTL); |
| 80 | dctl &= DCTL_TSTCTL_MASK; |
| 81 | dctl >>= DCTL_TSTCTL_SHIFT; |
| 82 | spin_unlock_irqrestore(&hsotg->lock, flags); |
| 83 | |
| 84 | switch (dctl) { |
| 85 | case 0: |
| 86 | seq_puts(s, "no test\n"); |
| 87 | break; |
| 88 | case TEST_J: |
| 89 | seq_puts(s, "test_j\n"); |
| 90 | break; |
| 91 | case TEST_K: |
| 92 | seq_puts(s, "test_k\n"); |
| 93 | break; |
| 94 | case TEST_SE0_NAK: |
| 95 | seq_puts(s, "test_se0_nak\n"); |
| 96 | break; |
| 97 | case TEST_PACKET: |
| 98 | seq_puts(s, "test_packet\n"); |
| 99 | break; |
| 100 | case TEST_FORCE_EN: |
| 101 | seq_puts(s, "test_force_enable\n"); |
| 102 | break; |
| 103 | default: |
| 104 | seq_printf(s, "UNKNOWN %d\n", dctl); |
| 105 | } |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int testmode_open(struct inode *inode, struct file *file) |
| 111 | { |
| 112 | return single_open(file, testmode_show, inode->i_private); |
| 113 | } |
| 114 | |
| 115 | static const struct file_operations testmode_fops = { |
| 116 | .owner = THIS_MODULE, |
| 117 | .open = testmode_open, |
| 118 | .write = testmode_write, |
| 119 | .read = seq_read, |
| 120 | .llseek = seq_lseek, |
| 121 | .release = single_release, |
| 122 | }; |
| 123 | |
| 124 | /** |
| 125 | * state_show - debugfs: show overall driver and device state. |
| 126 | * @seq: The seq file to write to. |
| 127 | * @v: Unused parameter. |
| 128 | * |
| 129 | * This debugfs entry shows the overall state of the hardware and |
| 130 | * some general information about each of the endpoints available |
| 131 | * to the system. |
| 132 | */ |
| 133 | static int state_show(struct seq_file *seq, void *v) |
| 134 | { |
| 135 | struct dwc2_hsotg *hsotg = seq->private; |
| 136 | void __iomem *regs = hsotg->regs; |
| 137 | int idx; |
| 138 | |
| 139 | seq_printf(seq, "DCFG=0x%08x, DCTL=0x%08x, DSTS=0x%08x\n", |
| 140 | readl(regs + DCFG), |
| 141 | readl(regs + DCTL), |
| 142 | readl(regs + DSTS)); |
| 143 | |
| 144 | seq_printf(seq, "DIEPMSK=0x%08x, DOEPMASK=0x%08x\n", |
| 145 | readl(regs + DIEPMSK), readl(regs + DOEPMSK)); |
| 146 | |
| 147 | seq_printf(seq, "GINTMSK=0x%08x, GINTSTS=0x%08x\n", |
| 148 | readl(regs + GINTMSK), |
| 149 | readl(regs + GINTSTS)); |
| 150 | |
| 151 | seq_printf(seq, "DAINTMSK=0x%08x, DAINT=0x%08x\n", |
| 152 | readl(regs + DAINTMSK), |
| 153 | readl(regs + DAINT)); |
| 154 | |
| 155 | seq_printf(seq, "GNPTXSTS=0x%08x, GRXSTSR=%08x\n", |
| 156 | readl(regs + GNPTXSTS), |
| 157 | readl(regs + GRXSTSR)); |
| 158 | |
| 159 | seq_puts(seq, "\nEndpoint status:\n"); |
| 160 | |
| 161 | for (idx = 0; idx < hsotg->num_of_eps; idx++) { |
| 162 | u32 in, out; |
| 163 | |
| 164 | in = readl(regs + DIEPCTL(idx)); |
| 165 | out = readl(regs + DOEPCTL(idx)); |
| 166 | |
| 167 | seq_printf(seq, "ep%d: DIEPCTL=0x%08x, DOEPCTL=0x%08x", |
| 168 | idx, in, out); |
| 169 | |
| 170 | in = readl(regs + DIEPTSIZ(idx)); |
| 171 | out = readl(regs + DOEPTSIZ(idx)); |
| 172 | |
| 173 | seq_printf(seq, ", DIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x", |
| 174 | in, out); |
| 175 | |
| 176 | seq_puts(seq, "\n"); |
| 177 | } |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static int state_open(struct inode *inode, struct file *file) |
| 183 | { |
| 184 | return single_open(file, state_show, inode->i_private); |
| 185 | } |
| 186 | |
| 187 | static const struct file_operations state_fops = { |
| 188 | .owner = THIS_MODULE, |
| 189 | .open = state_open, |
| 190 | .read = seq_read, |
| 191 | .llseek = seq_lseek, |
| 192 | .release = single_release, |
| 193 | }; |
| 194 | |
| 195 | /** |
| 196 | * fifo_show - debugfs: show the fifo information |
| 197 | * @seq: The seq_file to write data to. |
| 198 | * @v: Unused parameter. |
| 199 | * |
| 200 | * Show the FIFO information for the overall fifo and all the |
| 201 | * periodic transmission FIFOs. |
| 202 | */ |
| 203 | static int fifo_show(struct seq_file *seq, void *v) |
| 204 | { |
| 205 | struct dwc2_hsotg *hsotg = seq->private; |
| 206 | void __iomem *regs = hsotg->regs; |
| 207 | u32 val; |
| 208 | int idx; |
| 209 | |
| 210 | seq_puts(seq, "Non-periodic FIFOs:\n"); |
| 211 | seq_printf(seq, "RXFIFO: Size %d\n", readl(regs + GRXFSIZ)); |
| 212 | |
| 213 | val = readl(regs + GNPTXFSIZ); |
| 214 | seq_printf(seq, "NPTXFIFO: Size %d, Start 0x%08x\n", |
| 215 | val >> FIFOSIZE_DEPTH_SHIFT, |
| 216 | val & FIFOSIZE_DEPTH_MASK); |
| 217 | |
| 218 | seq_puts(seq, "\nPeriodic TXFIFOs:\n"); |
| 219 | |
| 220 | for (idx = 1; idx < hsotg->num_of_eps; idx++) { |
| 221 | val = readl(regs + DPTXFSIZN(idx)); |
| 222 | |
| 223 | seq_printf(seq, "\tDPTXFIFO%2d: Size %d, Start 0x%08x\n", idx, |
| 224 | val >> FIFOSIZE_DEPTH_SHIFT, |
| 225 | val & FIFOSIZE_STARTADDR_MASK); |
| 226 | } |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | static int fifo_open(struct inode *inode, struct file *file) |
| 232 | { |
| 233 | return single_open(file, fifo_show, inode->i_private); |
| 234 | } |
| 235 | |
| 236 | static const struct file_operations fifo_fops = { |
| 237 | .owner = THIS_MODULE, |
| 238 | .open = fifo_open, |
| 239 | .read = seq_read, |
| 240 | .llseek = seq_lseek, |
| 241 | .release = single_release, |
| 242 | }; |
| 243 | |
| 244 | static const char *decode_direction(int is_in) |
| 245 | { |
| 246 | return is_in ? "in" : "out"; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * ep_show - debugfs: show the state of an endpoint. |
| 251 | * @seq: The seq_file to write data to. |
| 252 | * @v: Unused parameter. |
| 253 | * |
| 254 | * This debugfs entry shows the state of the given endpoint (one is |
| 255 | * registered for each available). |
| 256 | */ |
| 257 | static int ep_show(struct seq_file *seq, void *v) |
| 258 | { |
| 259 | struct s3c_hsotg_ep *ep = seq->private; |
| 260 | struct dwc2_hsotg *hsotg = ep->parent; |
| 261 | struct s3c_hsotg_req *req; |
| 262 | void __iomem *regs = hsotg->regs; |
| 263 | int index = ep->index; |
| 264 | int show_limit = 15; |
| 265 | unsigned long flags; |
| 266 | |
| 267 | seq_printf(seq, "Endpoint index %d, named %s, dir %s:\n", |
| 268 | ep->index, ep->ep.name, decode_direction(ep->dir_in)); |
| 269 | |
| 270 | /* first show the register state */ |
| 271 | |
| 272 | seq_printf(seq, "\tDIEPCTL=0x%08x, DOEPCTL=0x%08x\n", |
| 273 | readl(regs + DIEPCTL(index)), |
| 274 | readl(regs + DOEPCTL(index))); |
| 275 | |
| 276 | seq_printf(seq, "\tDIEPDMA=0x%08x, DOEPDMA=0x%08x\n", |
| 277 | readl(regs + DIEPDMA(index)), |
| 278 | readl(regs + DOEPDMA(index))); |
| 279 | |
| 280 | seq_printf(seq, "\tDIEPINT=0x%08x, DOEPINT=0x%08x\n", |
| 281 | readl(regs + DIEPINT(index)), |
| 282 | readl(regs + DOEPINT(index))); |
| 283 | |
| 284 | seq_printf(seq, "\tDIEPTSIZ=0x%08x, DOEPTSIZ=0x%08x\n", |
| 285 | readl(regs + DIEPTSIZ(index)), |
| 286 | readl(regs + DOEPTSIZ(index))); |
| 287 | |
| 288 | seq_puts(seq, "\n"); |
| 289 | seq_printf(seq, "mps %d\n", ep->ep.maxpacket); |
| 290 | seq_printf(seq, "total_data=%ld\n", ep->total_data); |
| 291 | |
| 292 | seq_printf(seq, "request list (%p,%p):\n", |
| 293 | ep->queue.next, ep->queue.prev); |
| 294 | |
| 295 | spin_lock_irqsave(&hsotg->lock, flags); |
| 296 | |
| 297 | list_for_each_entry(req, &ep->queue, queue) { |
| 298 | if (--show_limit < 0) { |
| 299 | seq_puts(seq, "not showing more requests...\n"); |
| 300 | break; |
| 301 | } |
| 302 | |
| 303 | seq_printf(seq, "%c req %p: %d bytes @%p, ", |
| 304 | req == ep->req ? '*' : ' ', |
| 305 | req, req->req.length, req->req.buf); |
| 306 | seq_printf(seq, "%d done, res %d\n", |
| 307 | req->req.actual, req->req.status); |
| 308 | } |
| 309 | |
| 310 | spin_unlock_irqrestore(&hsotg->lock, flags); |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static int ep_open(struct inode *inode, struct file *file) |
| 316 | { |
| 317 | return single_open(file, ep_show, inode->i_private); |
| 318 | } |
| 319 | |
| 320 | static const struct file_operations ep_fops = { |
| 321 | .owner = THIS_MODULE, |
| 322 | .open = ep_open, |
| 323 | .read = seq_read, |
| 324 | .llseek = seq_lseek, |
| 325 | .release = single_release, |
| 326 | }; |
| 327 | |
| 328 | /** |
| 329 | * s3c_hsotg_create_debug - create debugfs directory and files |
| 330 | * @hsotg: The driver state |
| 331 | * |
| 332 | * Create the debugfs files to allow the user to get information |
| 333 | * about the state of the system. The directory name is created |
| 334 | * with the same name as the device itself, in case we end up |
| 335 | * with multiple blocks in future systems. |
| 336 | */ |
| 337 | static void s3c_hsotg_create_debug(struct dwc2_hsotg *hsotg) |
| 338 | { |
| 339 | struct dentry *root; |
| 340 | struct dentry *file; |
| 341 | unsigned epidx; |
| 342 | |
| 343 | root = hsotg->debug_root; |
| 344 | |
| 345 | /* create general state file */ |
| 346 | |
| 347 | file = debugfs_create_file("state", S_IRUGO, root, hsotg, &state_fops); |
| 348 | if (IS_ERR(file)) |
| 349 | dev_err(hsotg->dev, "%s: failed to create state\n", __func__); |
| 350 | |
| 351 | file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root, hsotg, |
| 352 | &testmode_fops); |
| 353 | if (IS_ERR(file)) |
| 354 | dev_err(hsotg->dev, "%s: failed to create testmode\n", |
| 355 | __func__); |
| 356 | |
| 357 | file = debugfs_create_file("fifo", S_IRUGO, root, hsotg, &fifo_fops); |
| 358 | if (IS_ERR(file)) |
| 359 | dev_err(hsotg->dev, "%s: failed to create fifo\n", __func__); |
| 360 | |
| 361 | /* Create one file for each out endpoint */ |
| 362 | for (epidx = 0; epidx < hsotg->num_of_eps; epidx++) { |
| 363 | struct s3c_hsotg_ep *ep; |
| 364 | |
| 365 | ep = hsotg->eps_out[epidx]; |
| 366 | if (ep) { |
| 367 | file = debugfs_create_file(ep->name, S_IRUGO, |
| 368 | root, ep, &ep_fops); |
| 369 | if (IS_ERR(file)) |
| 370 | dev_err(hsotg->dev, "failed to create %s debug file\n", |
| 371 | ep->name); |
| 372 | } |
| 373 | } |
| 374 | /* Create one file for each in endpoint. EP0 is handled with out eps */ |
| 375 | for (epidx = 1; epidx < hsotg->num_of_eps; epidx++) { |
| 376 | struct s3c_hsotg_ep *ep; |
| 377 | |
| 378 | ep = hsotg->eps_in[epidx]; |
| 379 | if (ep) { |
| 380 | file = debugfs_create_file(ep->name, S_IRUGO, |
| 381 | root, ep, &ep_fops); |
| 382 | if (IS_ERR(file)) |
| 383 | dev_err(hsotg->dev, "failed to create %s debug file\n", |
| 384 | ep->name); |
| 385 | } |
| 386 | } |
| 387 | } |
| 388 | #else |
| 389 | static inline void s3c_hsotg_create_debug(struct dwc2_hsotg *hsotg) {} |
| 390 | #endif |
| 391 | |
| 392 | /* s3c_hsotg_delete_debug is removed as cleanup in done in dwc2_debugfs_exit */ |
| 393 | |
| 394 | int dwc2_debugfs_init(struct dwc2_hsotg *hsotg) |
| 395 | { |
| 396 | int ret; |
| 397 | |
| 398 | hsotg->debug_root = debugfs_create_dir(dev_name(hsotg->dev), NULL); |
| 399 | if (!hsotg->debug_root) { |
| 400 | ret = -ENOMEM; |
| 401 | goto err0; |
| 402 | } |
| 403 | |
| 404 | /* Add gadget debugfs nodes */ |
| 405 | s3c_hsotg_create_debug(hsotg); |
| 406 | err0: |
| 407 | return ret; |
| 408 | } |
| 409 | EXPORT_SYMBOL_GPL(dwc2_debugfs_init); |
| 410 | |
| 411 | void dwc2_debugfs_exit(struct dwc2_hsotg *hsotg) |
| 412 | { |
| 413 | debugfs_remove_recursive(hsotg->debug_root); |
| 414 | hsotg->debug_root = NULL; |
| 415 | } |
| 416 | EXPORT_SYMBOL_GPL(dwc2_debugfs_exit); |