1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/device.h> 4 #include <linux/types.h> 5 #include <linux/spinlock.h> 6 #include <linux/debugfs.h> 7 #include <linux/seq_file.h> 8 #include <linux/uaccess.h> 9 #include <linux/usb/ch9.h> 10 #include <linux/usb/gadget.h> 11 #include <linux/usb/phy.h> 12 #include <linux/usb/otg.h> 13 #include <linux/usb/otg-fsm.h> 14 #include <linux/usb/chipidea.h> 15 16 #include "ci.h" 17 #include "udc.h" 18 #include "bits.h" 19 #include "otg.h" 20 21 /** 22 * ci_device_show: prints information about device capabilities and status 23 */ 24 static int ci_device_show(struct seq_file *s, void *data) 25 { 26 struct ci_hdrc *ci = s->private; 27 struct usb_gadget *gadget = &ci->gadget; 28 29 seq_printf(s, "speed = %d\n", gadget->speed); 30 seq_printf(s, "max_speed = %d\n", gadget->max_speed); 31 seq_printf(s, "is_otg = %d\n", gadget->is_otg); 32 seq_printf(s, "is_a_peripheral = %d\n", gadget->is_a_peripheral); 33 seq_printf(s, "b_hnp_enable = %d\n", gadget->b_hnp_enable); 34 seq_printf(s, "a_hnp_support = %d\n", gadget->a_hnp_support); 35 seq_printf(s, "a_alt_hnp_support = %d\n", gadget->a_alt_hnp_support); 36 seq_printf(s, "name = %s\n", 37 (gadget->name ? gadget->name : "")); 38 39 if (!ci->driver) 40 return 0; 41 42 seq_printf(s, "gadget function = %s\n", 43 (ci->driver->function ? ci->driver->function : "")); 44 seq_printf(s, "gadget max speed = %d\n", ci->driver->max_speed); 45 46 return 0; 47 } 48 49 static int ci_device_open(struct inode *inode, struct file *file) 50 { 51 return single_open(file, ci_device_show, inode->i_private); 52 } 53 54 static const struct file_operations ci_device_fops = { 55 .open = ci_device_open, 56 .read = seq_read, 57 .llseek = seq_lseek, 58 .release = single_release, 59 }; 60 61 /** 62 * ci_port_test_show: reads port test mode 63 */ 64 static int ci_port_test_show(struct seq_file *s, void *data) 65 { 66 struct ci_hdrc *ci = s->private; 67 unsigned long flags; 68 unsigned mode; 69 70 pm_runtime_get_sync(ci->dev); 71 spin_lock_irqsave(&ci->lock, flags); 72 mode = hw_port_test_get(ci); 73 spin_unlock_irqrestore(&ci->lock, flags); 74 pm_runtime_put_sync(ci->dev); 75 76 seq_printf(s, "mode = %u\n", mode); 77 78 return 0; 79 } 80 81 /** 82 * ci_port_test_write: writes port test mode 83 */ 84 static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf, 85 size_t count, loff_t *ppos) 86 { 87 struct seq_file *s = file->private_data; 88 struct ci_hdrc *ci = s->private; 89 unsigned long flags; 90 unsigned mode; 91 char buf[32]; 92 int ret; 93 94 count = min_t(size_t, sizeof(buf) - 1, count); 95 if (copy_from_user(buf, ubuf, count)) 96 return -EFAULT; 97 98 /* sscanf requires a zero terminated string */ 99 buf[count] = '\0'; 100 101 if (sscanf(buf, "%u", &mode) != 1) 102 return -EINVAL; 103 104 if (mode > 255) 105 return -EBADRQC; 106 107 pm_runtime_get_sync(ci->dev); 108 spin_lock_irqsave(&ci->lock, flags); 109 ret = hw_port_test_set(ci, mode); 110 spin_unlock_irqrestore(&ci->lock, flags); 111 pm_runtime_put_sync(ci->dev); 112 113 return ret ? ret : count; 114 } 115 116 static int ci_port_test_open(struct inode *inode, struct file *file) 117 { 118 return single_open(file, ci_port_test_show, inode->i_private); 119 } 120 121 static const struct file_operations ci_port_test_fops = { 122 .open = ci_port_test_open, 123 .write = ci_port_test_write, 124 .read = seq_read, 125 .llseek = seq_lseek, 126 .release = single_release, 127 }; 128 129 /** 130 * ci_qheads_show: DMA contents of all queue heads 131 */ 132 static int ci_qheads_show(struct seq_file *s, void *data) 133 { 134 struct ci_hdrc *ci = s->private; 135 unsigned long flags; 136 unsigned i, j; 137 138 if (ci->role != CI_ROLE_GADGET) { 139 seq_printf(s, "not in gadget mode\n"); 140 return 0; 141 } 142 143 spin_lock_irqsave(&ci->lock, flags); 144 for (i = 0; i < ci->hw_ep_max/2; i++) { 145 struct ci_hw_ep *hweprx = &ci->ci_hw_ep[i]; 146 struct ci_hw_ep *hweptx = 147 &ci->ci_hw_ep[i + ci->hw_ep_max/2]; 148 seq_printf(s, "EP=%02i: RX=%08X TX=%08X\n", 149 i, (u32)hweprx->qh.dma, (u32)hweptx->qh.dma); 150 for (j = 0; j < (sizeof(struct ci_hw_qh)/sizeof(u32)); j++) 151 seq_printf(s, " %04X: %08X %08X\n", j, 152 *((u32 *)hweprx->qh.ptr + j), 153 *((u32 *)hweptx->qh.ptr + j)); 154 } 155 spin_unlock_irqrestore(&ci->lock, flags); 156 157 return 0; 158 } 159 160 static int ci_qheads_open(struct inode *inode, struct file *file) 161 { 162 return single_open(file, ci_qheads_show, inode->i_private); 163 } 164 165 static const struct file_operations ci_qheads_fops = { 166 .open = ci_qheads_open, 167 .read = seq_read, 168 .llseek = seq_lseek, 169 .release = single_release, 170 }; 171 172 /** 173 * ci_requests_show: DMA contents of all requests currently queued (all endpts) 174 */ 175 static int ci_requests_show(struct seq_file *s, void *data) 176 { 177 struct ci_hdrc *ci = s->private; 178 unsigned long flags; 179 struct ci_hw_req *req = NULL; 180 struct td_node *node, *tmpnode; 181 unsigned i, j, qsize = sizeof(struct ci_hw_td)/sizeof(u32); 182 183 if (ci->role != CI_ROLE_GADGET) { 184 seq_printf(s, "not in gadget mode\n"); 185 return 0; 186 } 187 188 spin_lock_irqsave(&ci->lock, flags); 189 for (i = 0; i < ci->hw_ep_max; i++) 190 list_for_each_entry(req, &ci->ci_hw_ep[i].qh.queue, queue) { 191 list_for_each_entry_safe(node, tmpnode, &req->tds, td) { 192 seq_printf(s, "EP=%02i: TD=%08X %s\n", 193 i % (ci->hw_ep_max / 2), 194 (u32)node->dma, 195 ((i < ci->hw_ep_max/2) ? 196 "RX" : "TX")); 197 198 for (j = 0; j < qsize; j++) 199 seq_printf(s, " %04X: %08X\n", j, 200 *((u32 *)node->ptr + j)); 201 } 202 } 203 spin_unlock_irqrestore(&ci->lock, flags); 204 205 return 0; 206 } 207 208 static int ci_requests_open(struct inode *inode, struct file *file) 209 { 210 return single_open(file, ci_requests_show, inode->i_private); 211 } 212 213 static const struct file_operations ci_requests_fops = { 214 .open = ci_requests_open, 215 .read = seq_read, 216 .llseek = seq_lseek, 217 .release = single_release, 218 }; 219 220 static int ci_otg_show(struct seq_file *s, void *unused) 221 { 222 struct ci_hdrc *ci = s->private; 223 struct otg_fsm *fsm; 224 225 if (!ci || !ci_otg_is_fsm_mode(ci)) 226 return 0; 227 228 fsm = &ci->fsm; 229 230 /* ------ State ----- */ 231 seq_printf(s, "OTG state: %s\n\n", 232 usb_otg_state_string(ci->otg.state)); 233 234 /* ------ State Machine Variables ----- */ 235 seq_printf(s, "a_bus_drop: %d\n", fsm->a_bus_drop); 236 237 seq_printf(s, "a_bus_req: %d\n", fsm->a_bus_req); 238 239 seq_printf(s, "a_srp_det: %d\n", fsm->a_srp_det); 240 241 seq_printf(s, "a_vbus_vld: %d\n", fsm->a_vbus_vld); 242 243 seq_printf(s, "b_conn: %d\n", fsm->b_conn); 244 245 seq_printf(s, "adp_change: %d\n", fsm->adp_change); 246 247 seq_printf(s, "power_up: %d\n", fsm->power_up); 248 249 seq_printf(s, "a_bus_resume: %d\n", fsm->a_bus_resume); 250 251 seq_printf(s, "a_bus_suspend: %d\n", fsm->a_bus_suspend); 252 253 seq_printf(s, "a_conn: %d\n", fsm->a_conn); 254 255 seq_printf(s, "b_bus_req: %d\n", fsm->b_bus_req); 256 257 seq_printf(s, "b_bus_suspend: %d\n", fsm->b_bus_suspend); 258 259 seq_printf(s, "b_se0_srp: %d\n", fsm->b_se0_srp); 260 261 seq_printf(s, "b_ssend_srp: %d\n", fsm->b_ssend_srp); 262 263 seq_printf(s, "b_sess_vld: %d\n", fsm->b_sess_vld); 264 265 seq_printf(s, "b_srp_done: %d\n", fsm->b_srp_done); 266 267 seq_printf(s, "drv_vbus: %d\n", fsm->drv_vbus); 268 269 seq_printf(s, "loc_conn: %d\n", fsm->loc_conn); 270 271 seq_printf(s, "loc_sof: %d\n", fsm->loc_sof); 272 273 seq_printf(s, "adp_prb: %d\n", fsm->adp_prb); 274 275 seq_printf(s, "id: %d\n", fsm->id); 276 277 seq_printf(s, "protocol: %d\n", fsm->protocol); 278 279 return 0; 280 } 281 282 static int ci_otg_open(struct inode *inode, struct file *file) 283 { 284 return single_open(file, ci_otg_show, inode->i_private); 285 } 286 287 static const struct file_operations ci_otg_fops = { 288 .open = ci_otg_open, 289 .read = seq_read, 290 .llseek = seq_lseek, 291 .release = single_release, 292 }; 293 294 static int ci_role_show(struct seq_file *s, void *data) 295 { 296 struct ci_hdrc *ci = s->private; 297 298 if (ci->role != CI_ROLE_END) 299 seq_printf(s, "%s\n", ci_role(ci)->name); 300 301 return 0; 302 } 303 304 static ssize_t ci_role_write(struct file *file, const char __user *ubuf, 305 size_t count, loff_t *ppos) 306 { 307 struct seq_file *s = file->private_data; 308 struct ci_hdrc *ci = s->private; 309 enum ci_role role; 310 char buf[8]; 311 int ret; 312 313 if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) 314 return -EFAULT; 315 316 for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++) 317 if (ci->roles[role] && 318 !strncmp(buf, ci->roles[role]->name, 319 strlen(ci->roles[role]->name))) 320 break; 321 322 if (role == CI_ROLE_END || role == ci->role) 323 return -EINVAL; 324 325 pm_runtime_get_sync(ci->dev); 326 disable_irq(ci->irq); 327 ci_role_stop(ci); 328 ret = ci_role_start(ci, role); 329 enable_irq(ci->irq); 330 pm_runtime_put_sync(ci->dev); 331 332 return ret ? ret : count; 333 } 334 335 static int ci_role_open(struct inode *inode, struct file *file) 336 { 337 return single_open(file, ci_role_show, inode->i_private); 338 } 339 340 static const struct file_operations ci_role_fops = { 341 .open = ci_role_open, 342 .write = ci_role_write, 343 .read = seq_read, 344 .llseek = seq_lseek, 345 .release = single_release, 346 }; 347 348 static int ci_registers_show(struct seq_file *s, void *unused) 349 { 350 struct ci_hdrc *ci = s->private; 351 u32 tmp_reg; 352 353 if (!ci || ci->in_lpm) 354 return -EPERM; 355 356 /* ------ Registers ----- */ 357 tmp_reg = hw_read_intr_enable(ci); 358 seq_printf(s, "USBINTR reg: %08x\n", tmp_reg); 359 360 tmp_reg = hw_read_intr_status(ci); 361 seq_printf(s, "USBSTS reg: %08x\n", tmp_reg); 362 363 tmp_reg = hw_read(ci, OP_USBMODE, ~0); 364 seq_printf(s, "USBMODE reg: %08x\n", tmp_reg); 365 366 tmp_reg = hw_read(ci, OP_USBCMD, ~0); 367 seq_printf(s, "USBCMD reg: %08x\n", tmp_reg); 368 369 tmp_reg = hw_read(ci, OP_PORTSC, ~0); 370 seq_printf(s, "PORTSC reg: %08x\n", tmp_reg); 371 372 if (ci->is_otg) { 373 tmp_reg = hw_read_otgsc(ci, ~0); 374 seq_printf(s, "OTGSC reg: %08x\n", tmp_reg); 375 } 376 377 return 0; 378 } 379 380 static int ci_registers_open(struct inode *inode, struct file *file) 381 { 382 return single_open(file, ci_registers_show, inode->i_private); 383 } 384 385 static const struct file_operations ci_registers_fops = { 386 .open = ci_registers_open, 387 .read = seq_read, 388 .llseek = seq_lseek, 389 .release = single_release, 390 }; 391 392 /** 393 * dbg_create_files: initializes the attribute interface 394 * @ci: device 395 * 396 * This function returns an error code 397 */ 398 int dbg_create_files(struct ci_hdrc *ci) 399 { 400 struct dentry *dent; 401 402 ci->debugfs = debugfs_create_dir(dev_name(ci->dev), NULL); 403 if (!ci->debugfs) 404 return -ENOMEM; 405 406 dent = debugfs_create_file("device", S_IRUGO, ci->debugfs, ci, 407 &ci_device_fops); 408 if (!dent) 409 goto err; 410 411 dent = debugfs_create_file("port_test", S_IRUGO | S_IWUSR, ci->debugfs, 412 ci, &ci_port_test_fops); 413 if (!dent) 414 goto err; 415 416 dent = debugfs_create_file("qheads", S_IRUGO, ci->debugfs, ci, 417 &ci_qheads_fops); 418 if (!dent) 419 goto err; 420 421 dent = debugfs_create_file("requests", S_IRUGO, ci->debugfs, ci, 422 &ci_requests_fops); 423 if (!dent) 424 goto err; 425 426 if (ci_otg_is_fsm_mode(ci)) { 427 dent = debugfs_create_file("otg", S_IRUGO, ci->debugfs, ci, 428 &ci_otg_fops); 429 if (!dent) 430 goto err; 431 } 432 433 dent = debugfs_create_file("role", S_IRUGO | S_IWUSR, ci->debugfs, ci, 434 &ci_role_fops); 435 if (!dent) 436 goto err; 437 438 dent = debugfs_create_file("registers", S_IRUGO, ci->debugfs, ci, 439 &ci_registers_fops); 440 441 if (dent) 442 return 0; 443 err: 444 debugfs_remove_recursive(ci->debugfs); 445 return -ENOMEM; 446 } 447 448 /** 449 * dbg_remove_files: destroys the attribute interface 450 * @ci: device 451 */ 452 void dbg_remove_files(struct ci_hdrc *ci) 453 { 454 debugfs_remove_recursive(ci->debugfs); 455 } 456