Jason Wessel | df6c516 | 2009-08-20 15:39:48 -0500 | [diff] [blame^] | 1 | #include <linux/console.h> |
| 2 | #include <linux/errno.h> |
| 3 | #include <linux/pci_regs.h> |
| 4 | #include <linux/pci_ids.h> |
| 5 | #include <linux/usb/ch9.h> |
| 6 | #include <linux/usb/ehci_def.h> |
| 7 | #include <linux/delay.h> |
| 8 | #include <asm/io.h> |
| 9 | #include <asm/pci-direct.h> |
| 10 | #include <asm/fixmap.h> |
| 11 | |
| 12 | static struct ehci_caps __iomem *ehci_caps; |
| 13 | static struct ehci_regs __iomem *ehci_regs; |
| 14 | static struct ehci_dbg_port __iomem *ehci_debug; |
| 15 | static unsigned int dbgp_endpoint_out; |
| 16 | |
| 17 | struct ehci_dev { |
| 18 | u32 bus; |
| 19 | u32 slot; |
| 20 | u32 func; |
| 21 | }; |
| 22 | |
| 23 | static struct ehci_dev ehci_dev; |
| 24 | |
| 25 | #define USB_DEBUG_DEVNUM 127 |
| 26 | |
| 27 | #define DBGP_DATA_TOGGLE 0x8800 |
| 28 | |
| 29 | static inline u32 dbgp_pid_update(u32 x, u32 tok) |
| 30 | { |
| 31 | return ((x ^ DBGP_DATA_TOGGLE) & 0xffff00) | (tok & 0xff); |
| 32 | } |
| 33 | |
| 34 | static inline u32 dbgp_len_update(u32 x, u32 len) |
| 35 | { |
| 36 | return (x & ~0x0f) | (len & 0x0f); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * USB Packet IDs (PIDs) |
| 41 | */ |
| 42 | |
| 43 | /* token */ |
| 44 | #define USB_PID_OUT 0xe1 |
| 45 | #define USB_PID_IN 0x69 |
| 46 | #define USB_PID_SOF 0xa5 |
| 47 | #define USB_PID_SETUP 0x2d |
| 48 | /* handshake */ |
| 49 | #define USB_PID_ACK 0xd2 |
| 50 | #define USB_PID_NAK 0x5a |
| 51 | #define USB_PID_STALL 0x1e |
| 52 | #define USB_PID_NYET 0x96 |
| 53 | /* data */ |
| 54 | #define USB_PID_DATA0 0xc3 |
| 55 | #define USB_PID_DATA1 0x4b |
| 56 | #define USB_PID_DATA2 0x87 |
| 57 | #define USB_PID_MDATA 0x0f |
| 58 | /* Special */ |
| 59 | #define USB_PID_PREAMBLE 0x3c |
| 60 | #define USB_PID_ERR 0x3c |
| 61 | #define USB_PID_SPLIT 0x78 |
| 62 | #define USB_PID_PING 0xb4 |
| 63 | #define USB_PID_UNDEF_0 0xf0 |
| 64 | |
| 65 | #define USB_PID_DATA_TOGGLE 0x88 |
| 66 | #define DBGP_CLAIM (DBGP_OWNER | DBGP_ENABLED | DBGP_INUSE) |
| 67 | |
| 68 | #define PCI_CAP_ID_EHCI_DEBUG 0xa |
| 69 | |
| 70 | #define HUB_ROOT_RESET_TIME 50 /* times are in msec */ |
| 71 | #define HUB_SHORT_RESET_TIME 10 |
| 72 | #define HUB_LONG_RESET_TIME 200 |
| 73 | #define HUB_RESET_TIMEOUT 500 |
| 74 | |
| 75 | #define DBGP_MAX_PACKET 8 |
| 76 | |
| 77 | static int dbgp_wait_until_complete(void) |
| 78 | { |
| 79 | u32 ctrl; |
| 80 | int loop = 0x100000; |
| 81 | |
| 82 | do { |
| 83 | ctrl = readl(&ehci_debug->control); |
| 84 | /* Stop when the transaction is finished */ |
| 85 | if (ctrl & DBGP_DONE) |
| 86 | break; |
| 87 | } while (--loop > 0); |
| 88 | |
| 89 | if (!loop) |
| 90 | return -1; |
| 91 | |
| 92 | /* |
| 93 | * Now that we have observed the completed transaction, |
| 94 | * clear the done bit. |
| 95 | */ |
| 96 | writel(ctrl | DBGP_DONE, &ehci_debug->control); |
| 97 | return (ctrl & DBGP_ERROR) ? -DBGP_ERRCODE(ctrl) : DBGP_LEN(ctrl); |
| 98 | } |
| 99 | |
| 100 | static void __init dbgp_mdelay(int ms) |
| 101 | { |
| 102 | int i; |
| 103 | |
| 104 | while (ms--) { |
| 105 | for (i = 0; i < 1000; i++) |
| 106 | outb(0x1, 0x80); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | static void dbgp_breath(void) |
| 111 | { |
| 112 | /* Sleep to give the debug port a chance to breathe */ |
| 113 | } |
| 114 | |
| 115 | static int dbgp_wait_until_done(unsigned ctrl) |
| 116 | { |
| 117 | u32 pids, lpid; |
| 118 | int ret; |
| 119 | int loop = 3; |
| 120 | |
| 121 | retry: |
| 122 | writel(ctrl | DBGP_GO, &ehci_debug->control); |
| 123 | ret = dbgp_wait_until_complete(); |
| 124 | pids = readl(&ehci_debug->pids); |
| 125 | lpid = DBGP_PID_GET(pids); |
| 126 | |
| 127 | if (ret < 0) |
| 128 | return ret; |
| 129 | |
| 130 | /* |
| 131 | * If the port is getting full or it has dropped data |
| 132 | * start pacing ourselves, not necessary but it's friendly. |
| 133 | */ |
| 134 | if ((lpid == USB_PID_NAK) || (lpid == USB_PID_NYET)) |
| 135 | dbgp_breath(); |
| 136 | |
| 137 | /* If I get a NACK reissue the transmission */ |
| 138 | if (lpid == USB_PID_NAK) { |
| 139 | if (--loop > 0) |
| 140 | goto retry; |
| 141 | } |
| 142 | |
| 143 | return ret; |
| 144 | } |
| 145 | |
| 146 | static void dbgp_set_data(const void *buf, int size) |
| 147 | { |
| 148 | const unsigned char *bytes = buf; |
| 149 | u32 lo, hi; |
| 150 | int i; |
| 151 | |
| 152 | lo = hi = 0; |
| 153 | for (i = 0; i < 4 && i < size; i++) |
| 154 | lo |= bytes[i] << (8*i); |
| 155 | for (; i < 8 && i < size; i++) |
| 156 | hi |= bytes[i] << (8*(i - 4)); |
| 157 | writel(lo, &ehci_debug->data03); |
| 158 | writel(hi, &ehci_debug->data47); |
| 159 | } |
| 160 | |
| 161 | static void __init dbgp_get_data(void *buf, int size) |
| 162 | { |
| 163 | unsigned char *bytes = buf; |
| 164 | u32 lo, hi; |
| 165 | int i; |
| 166 | |
| 167 | lo = readl(&ehci_debug->data03); |
| 168 | hi = readl(&ehci_debug->data47); |
| 169 | for (i = 0; i < 4 && i < size; i++) |
| 170 | bytes[i] = (lo >> (8*i)) & 0xff; |
| 171 | for (; i < 8 && i < size; i++) |
| 172 | bytes[i] = (hi >> (8*(i - 4))) & 0xff; |
| 173 | } |
| 174 | |
| 175 | static int dbgp_bulk_write(unsigned devnum, unsigned endpoint, |
| 176 | const char *bytes, int size) |
| 177 | { |
| 178 | u32 pids, addr, ctrl; |
| 179 | int ret; |
| 180 | |
| 181 | if (size > DBGP_MAX_PACKET) |
| 182 | return -1; |
| 183 | |
| 184 | addr = DBGP_EPADDR(devnum, endpoint); |
| 185 | |
| 186 | pids = readl(&ehci_debug->pids); |
| 187 | pids = dbgp_pid_update(pids, USB_PID_OUT); |
| 188 | |
| 189 | ctrl = readl(&ehci_debug->control); |
| 190 | ctrl = dbgp_len_update(ctrl, size); |
| 191 | ctrl |= DBGP_OUT; |
| 192 | ctrl |= DBGP_GO; |
| 193 | |
| 194 | dbgp_set_data(bytes, size); |
| 195 | writel(addr, &ehci_debug->address); |
| 196 | writel(pids, &ehci_debug->pids); |
| 197 | |
| 198 | ret = dbgp_wait_until_done(ctrl); |
| 199 | if (ret < 0) |
| 200 | return ret; |
| 201 | |
| 202 | return ret; |
| 203 | } |
| 204 | |
| 205 | static int __init dbgp_bulk_read(unsigned devnum, unsigned endpoint, void *data, |
| 206 | int size) |
| 207 | { |
| 208 | u32 pids, addr, ctrl; |
| 209 | int ret; |
| 210 | |
| 211 | if (size > DBGP_MAX_PACKET) |
| 212 | return -1; |
| 213 | |
| 214 | addr = DBGP_EPADDR(devnum, endpoint); |
| 215 | |
| 216 | pids = readl(&ehci_debug->pids); |
| 217 | pids = dbgp_pid_update(pids, USB_PID_IN); |
| 218 | |
| 219 | ctrl = readl(&ehci_debug->control); |
| 220 | ctrl = dbgp_len_update(ctrl, size); |
| 221 | ctrl &= ~DBGP_OUT; |
| 222 | ctrl |= DBGP_GO; |
| 223 | |
| 224 | writel(addr, &ehci_debug->address); |
| 225 | writel(pids, &ehci_debug->pids); |
| 226 | ret = dbgp_wait_until_done(ctrl); |
| 227 | if (ret < 0) |
| 228 | return ret; |
| 229 | |
| 230 | if (size > ret) |
| 231 | size = ret; |
| 232 | dbgp_get_data(data, size); |
| 233 | return ret; |
| 234 | } |
| 235 | |
| 236 | static int __init dbgp_control_msg(unsigned devnum, int requesttype, |
| 237 | int request, int value, int index, void *data, int size) |
| 238 | { |
| 239 | u32 pids, addr, ctrl; |
| 240 | struct usb_ctrlrequest req; |
| 241 | int read; |
| 242 | int ret; |
| 243 | |
| 244 | read = (requesttype & USB_DIR_IN) != 0; |
| 245 | if (size > (read ? DBGP_MAX_PACKET:0)) |
| 246 | return -1; |
| 247 | |
| 248 | /* Compute the control message */ |
| 249 | req.bRequestType = requesttype; |
| 250 | req.bRequest = request; |
| 251 | req.wValue = cpu_to_le16(value); |
| 252 | req.wIndex = cpu_to_le16(index); |
| 253 | req.wLength = cpu_to_le16(size); |
| 254 | |
| 255 | pids = DBGP_PID_SET(USB_PID_DATA0, USB_PID_SETUP); |
| 256 | addr = DBGP_EPADDR(devnum, 0); |
| 257 | |
| 258 | ctrl = readl(&ehci_debug->control); |
| 259 | ctrl = dbgp_len_update(ctrl, sizeof(req)); |
| 260 | ctrl |= DBGP_OUT; |
| 261 | ctrl |= DBGP_GO; |
| 262 | |
| 263 | /* Send the setup message */ |
| 264 | dbgp_set_data(&req, sizeof(req)); |
| 265 | writel(addr, &ehci_debug->address); |
| 266 | writel(pids, &ehci_debug->pids); |
| 267 | ret = dbgp_wait_until_done(ctrl); |
| 268 | if (ret < 0) |
| 269 | return ret; |
| 270 | |
| 271 | /* Read the result */ |
| 272 | return dbgp_bulk_read(devnum, 0, data, size); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /* Find a PCI capability */ |
| 277 | static u32 __init find_cap(u32 num, u32 slot, u32 func, int cap) |
| 278 | { |
| 279 | u8 pos; |
| 280 | int bytes; |
| 281 | |
| 282 | if (!(read_pci_config_16(num, slot, func, PCI_STATUS) & |
| 283 | PCI_STATUS_CAP_LIST)) |
| 284 | return 0; |
| 285 | |
| 286 | pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST); |
| 287 | for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) { |
| 288 | u8 id; |
| 289 | |
| 290 | pos &= ~3; |
| 291 | id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID); |
| 292 | if (id == 0xff) |
| 293 | break; |
| 294 | if (id == cap) |
| 295 | return pos; |
| 296 | |
| 297 | pos = read_pci_config_byte(num, slot, func, |
| 298 | pos+PCI_CAP_LIST_NEXT); |
| 299 | } |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | static u32 __init __find_dbgp(u32 bus, u32 slot, u32 func) |
| 304 | { |
| 305 | u32 class; |
| 306 | |
| 307 | class = read_pci_config(bus, slot, func, PCI_CLASS_REVISION); |
| 308 | if ((class >> 8) != PCI_CLASS_SERIAL_USB_EHCI) |
| 309 | return 0; |
| 310 | |
| 311 | return find_cap(bus, slot, func, PCI_CAP_ID_EHCI_DEBUG); |
| 312 | } |
| 313 | |
| 314 | static u32 __init find_dbgp(int ehci_num, u32 *rbus, u32 *rslot, u32 *rfunc) |
| 315 | { |
| 316 | u32 bus, slot, func; |
| 317 | |
| 318 | for (bus = 0; bus < 256; bus++) { |
| 319 | for (slot = 0; slot < 32; slot++) { |
| 320 | for (func = 0; func < 8; func++) { |
| 321 | unsigned cap; |
| 322 | |
| 323 | cap = __find_dbgp(bus, slot, func); |
| 324 | |
| 325 | if (!cap) |
| 326 | continue; |
| 327 | if (ehci_num-- != 0) |
| 328 | continue; |
| 329 | *rbus = bus; |
| 330 | *rslot = slot; |
| 331 | *rfunc = func; |
| 332 | return cap; |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | static int __init ehci_reset_port(int port) |
| 340 | { |
| 341 | u32 portsc; |
| 342 | u32 delay_time, delay; |
| 343 | int loop; |
| 344 | |
| 345 | /* Reset the usb debug port */ |
| 346 | portsc = readl(&ehci_regs->port_status[port - 1]); |
| 347 | portsc &= ~PORT_PE; |
| 348 | portsc |= PORT_RESET; |
| 349 | writel(portsc, &ehci_regs->port_status[port - 1]); |
| 350 | |
| 351 | delay = HUB_ROOT_RESET_TIME; |
| 352 | for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT; |
| 353 | delay_time += delay) { |
| 354 | dbgp_mdelay(delay); |
| 355 | |
| 356 | portsc = readl(&ehci_regs->port_status[port - 1]); |
| 357 | if (portsc & PORT_RESET) { |
| 358 | /* force reset to complete */ |
| 359 | loop = 2; |
| 360 | writel(portsc & ~(PORT_RWC_BITS | PORT_RESET), |
| 361 | &ehci_regs->port_status[port - 1]); |
| 362 | do { |
| 363 | portsc = readl(&ehci_regs->port_status[port-1]); |
| 364 | } while ((portsc & PORT_RESET) && (--loop > 0)); |
| 365 | } |
| 366 | |
| 367 | /* Device went away? */ |
| 368 | if (!(portsc & PORT_CONNECT)) |
| 369 | return -ENOTCONN; |
| 370 | |
| 371 | /* bomb out completely if something weird happend */ |
| 372 | if ((portsc & PORT_CSC)) |
| 373 | return -EINVAL; |
| 374 | |
| 375 | /* If we've finished resetting, then break out of the loop */ |
| 376 | if (!(portsc & PORT_RESET) && (portsc & PORT_PE)) |
| 377 | return 0; |
| 378 | } |
| 379 | return -EBUSY; |
| 380 | } |
| 381 | |
| 382 | static int __init ehci_wait_for_port(int port) |
| 383 | { |
| 384 | u32 status; |
| 385 | int ret, reps; |
| 386 | |
| 387 | for (reps = 0; reps < 3; reps++) { |
| 388 | dbgp_mdelay(100); |
| 389 | status = readl(&ehci_regs->status); |
| 390 | if (status & STS_PCD) { |
| 391 | ret = ehci_reset_port(port); |
| 392 | if (ret == 0) |
| 393 | return 0; |
| 394 | } |
| 395 | } |
| 396 | return -ENOTCONN; |
| 397 | } |
| 398 | |
| 399 | #ifdef DBGP_DEBUG |
| 400 | # define dbgp_printk early_printk |
| 401 | #else |
| 402 | static inline void dbgp_printk(const char *fmt, ...) { } |
| 403 | #endif |
| 404 | |
| 405 | typedef void (*set_debug_port_t)(int port); |
| 406 | |
| 407 | static void __init default_set_debug_port(int port) |
| 408 | { |
| 409 | } |
| 410 | |
| 411 | static set_debug_port_t __initdata set_debug_port = default_set_debug_port; |
| 412 | |
| 413 | static void __init nvidia_set_debug_port(int port) |
| 414 | { |
| 415 | u32 dword; |
| 416 | dword = read_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, |
| 417 | 0x74); |
| 418 | dword &= ~(0x0f<<12); |
| 419 | dword |= ((port & 0x0f)<<12); |
| 420 | write_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, 0x74, |
| 421 | dword); |
| 422 | dbgp_printk("set debug port to %d\n", port); |
| 423 | } |
| 424 | |
| 425 | static void __init detect_set_debug_port(void) |
| 426 | { |
| 427 | u32 vendorid; |
| 428 | |
| 429 | vendorid = read_pci_config(ehci_dev.bus, ehci_dev.slot, ehci_dev.func, |
| 430 | 0x00); |
| 431 | |
| 432 | if ((vendorid & 0xffff) == 0x10de) { |
| 433 | dbgp_printk("using nvidia set_debug_port\n"); |
| 434 | set_debug_port = nvidia_set_debug_port; |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | static int __init ehci_setup(void) |
| 439 | { |
| 440 | struct usb_debug_descriptor dbgp_desc; |
| 441 | u32 cmd, ctrl, status, portsc, hcs_params; |
| 442 | u32 debug_port, new_debug_port = 0, n_ports; |
| 443 | u32 devnum; |
| 444 | int ret, i; |
| 445 | int loop; |
| 446 | int port_map_tried; |
| 447 | int playtimes = 3; |
| 448 | |
| 449 | try_next_time: |
| 450 | port_map_tried = 0; |
| 451 | |
| 452 | try_next_port: |
| 453 | |
| 454 | hcs_params = readl(&ehci_caps->hcs_params); |
| 455 | debug_port = HCS_DEBUG_PORT(hcs_params); |
| 456 | n_ports = HCS_N_PORTS(hcs_params); |
| 457 | |
| 458 | dbgp_printk("debug_port: %d\n", debug_port); |
| 459 | dbgp_printk("n_ports: %d\n", n_ports); |
| 460 | |
| 461 | for (i = 1; i <= n_ports; i++) { |
| 462 | portsc = readl(&ehci_regs->port_status[i-1]); |
| 463 | dbgp_printk("portstatus%d: %08x\n", i, portsc); |
| 464 | } |
| 465 | |
| 466 | if (port_map_tried && (new_debug_port != debug_port)) { |
| 467 | if (--playtimes) { |
| 468 | set_debug_port(new_debug_port); |
| 469 | goto try_next_time; |
| 470 | } |
| 471 | return -1; |
| 472 | } |
| 473 | |
| 474 | loop = 100000; |
| 475 | /* Reset the EHCI controller */ |
| 476 | cmd = readl(&ehci_regs->command); |
| 477 | cmd |= CMD_RESET; |
| 478 | writel(cmd, &ehci_regs->command); |
| 479 | do { |
| 480 | cmd = readl(&ehci_regs->command); |
| 481 | } while ((cmd & CMD_RESET) && (--loop > 0)); |
| 482 | |
| 483 | if (!loop) { |
| 484 | dbgp_printk("can not reset ehci\n"); |
| 485 | return -1; |
| 486 | } |
| 487 | dbgp_printk("ehci reset done\n"); |
| 488 | |
| 489 | /* Claim ownership, but do not enable yet */ |
| 490 | ctrl = readl(&ehci_debug->control); |
| 491 | ctrl |= DBGP_OWNER; |
| 492 | ctrl &= ~(DBGP_ENABLED | DBGP_INUSE); |
| 493 | writel(ctrl, &ehci_debug->control); |
| 494 | |
| 495 | /* Start the ehci running */ |
| 496 | cmd = readl(&ehci_regs->command); |
| 497 | cmd &= ~(CMD_LRESET | CMD_IAAD | CMD_PSE | CMD_ASE | CMD_RESET); |
| 498 | cmd |= CMD_RUN; |
| 499 | writel(cmd, &ehci_regs->command); |
| 500 | |
| 501 | /* Ensure everything is routed to the EHCI */ |
| 502 | writel(FLAG_CF, &ehci_regs->configured_flag); |
| 503 | |
| 504 | /* Wait until the controller is no longer halted */ |
| 505 | loop = 10; |
| 506 | do { |
| 507 | status = readl(&ehci_regs->status); |
| 508 | } while ((status & STS_HALT) && (--loop > 0)); |
| 509 | |
| 510 | if (!loop) { |
| 511 | dbgp_printk("ehci can be started\n"); |
| 512 | return -1; |
| 513 | } |
| 514 | dbgp_printk("ehci started\n"); |
| 515 | |
| 516 | /* Wait for a device to show up in the debug port */ |
| 517 | ret = ehci_wait_for_port(debug_port); |
| 518 | if (ret < 0) { |
| 519 | dbgp_printk("No device found in debug port\n"); |
| 520 | goto next_debug_port; |
| 521 | } |
| 522 | dbgp_printk("ehci wait for port done\n"); |
| 523 | |
| 524 | /* Enable the debug port */ |
| 525 | ctrl = readl(&ehci_debug->control); |
| 526 | ctrl |= DBGP_CLAIM; |
| 527 | writel(ctrl, &ehci_debug->control); |
| 528 | ctrl = readl(&ehci_debug->control); |
| 529 | if ((ctrl & DBGP_CLAIM) != DBGP_CLAIM) { |
| 530 | dbgp_printk("No device in debug port\n"); |
| 531 | writel(ctrl & ~DBGP_CLAIM, &ehci_debug->control); |
| 532 | goto err; |
| 533 | } |
| 534 | dbgp_printk("debug ported enabled\n"); |
| 535 | |
| 536 | /* Completely transfer the debug device to the debug controller */ |
| 537 | portsc = readl(&ehci_regs->port_status[debug_port - 1]); |
| 538 | portsc &= ~PORT_PE; |
| 539 | writel(portsc, &ehci_regs->port_status[debug_port - 1]); |
| 540 | |
| 541 | dbgp_mdelay(100); |
| 542 | |
| 543 | /* Find the debug device and make it device number 127 */ |
| 544 | for (devnum = 0; devnum <= 127; devnum++) { |
| 545 | ret = dbgp_control_msg(devnum, |
| 546 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 547 | USB_REQ_GET_DESCRIPTOR, (USB_DT_DEBUG << 8), 0, |
| 548 | &dbgp_desc, sizeof(dbgp_desc)); |
| 549 | if (ret > 0) |
| 550 | break; |
| 551 | } |
| 552 | if (devnum > 127) { |
| 553 | dbgp_printk("Could not find attached debug device\n"); |
| 554 | goto err; |
| 555 | } |
| 556 | if (ret < 0) { |
| 557 | dbgp_printk("Attached device is not a debug device\n"); |
| 558 | goto err; |
| 559 | } |
| 560 | dbgp_endpoint_out = dbgp_desc.bDebugOutEndpoint; |
| 561 | |
| 562 | /* Move the device to 127 if it isn't already there */ |
| 563 | if (devnum != USB_DEBUG_DEVNUM) { |
| 564 | ret = dbgp_control_msg(devnum, |
| 565 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 566 | USB_REQ_SET_ADDRESS, USB_DEBUG_DEVNUM, 0, NULL, 0); |
| 567 | if (ret < 0) { |
| 568 | dbgp_printk("Could not move attached device to %d\n", |
| 569 | USB_DEBUG_DEVNUM); |
| 570 | goto err; |
| 571 | } |
| 572 | devnum = USB_DEBUG_DEVNUM; |
| 573 | dbgp_printk("debug device renamed to 127\n"); |
| 574 | } |
| 575 | |
| 576 | /* Enable the debug interface */ |
| 577 | ret = dbgp_control_msg(USB_DEBUG_DEVNUM, |
| 578 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, |
| 579 | USB_REQ_SET_FEATURE, USB_DEVICE_DEBUG_MODE, 0, NULL, 0); |
| 580 | if (ret < 0) { |
| 581 | dbgp_printk(" Could not enable the debug device\n"); |
| 582 | goto err; |
| 583 | } |
| 584 | dbgp_printk("debug interface enabled\n"); |
| 585 | |
| 586 | /* Perform a small write to get the even/odd data state in sync |
| 587 | */ |
| 588 | ret = dbgp_bulk_write(USB_DEBUG_DEVNUM, dbgp_endpoint_out, " ", 1); |
| 589 | if (ret < 0) { |
| 590 | dbgp_printk("dbgp_bulk_write failed: %d\n", ret); |
| 591 | goto err; |
| 592 | } |
| 593 | dbgp_printk("small write doned\n"); |
| 594 | |
| 595 | return 0; |
| 596 | err: |
| 597 | /* Things didn't work so remove my claim */ |
| 598 | ctrl = readl(&ehci_debug->control); |
| 599 | ctrl &= ~(DBGP_CLAIM | DBGP_OUT); |
| 600 | writel(ctrl, &ehci_debug->control); |
| 601 | return -1; |
| 602 | |
| 603 | next_debug_port: |
| 604 | port_map_tried |= (1<<(debug_port - 1)); |
| 605 | new_debug_port = ((debug_port-1+1)%n_ports) + 1; |
| 606 | if (port_map_tried != ((1<<n_ports) - 1)) { |
| 607 | set_debug_port(new_debug_port); |
| 608 | goto try_next_port; |
| 609 | } |
| 610 | if (--playtimes) { |
| 611 | set_debug_port(new_debug_port); |
| 612 | goto try_next_time; |
| 613 | } |
| 614 | |
| 615 | return -1; |
| 616 | } |
| 617 | |
| 618 | int __init early_dbgp_init(char *s) |
| 619 | { |
| 620 | u32 debug_port, bar, offset; |
| 621 | u32 bus, slot, func, cap; |
| 622 | void __iomem *ehci_bar; |
| 623 | u32 dbgp_num; |
| 624 | u32 bar_val; |
| 625 | char *e; |
| 626 | int ret; |
| 627 | u8 byte; |
| 628 | |
| 629 | if (!early_pci_allowed()) |
| 630 | return -1; |
| 631 | |
| 632 | dbgp_num = 0; |
| 633 | if (*s) |
| 634 | dbgp_num = simple_strtoul(s, &e, 10); |
| 635 | dbgp_printk("dbgp_num: %d\n", dbgp_num); |
| 636 | |
| 637 | cap = find_dbgp(dbgp_num, &bus, &slot, &func); |
| 638 | if (!cap) |
| 639 | return -1; |
| 640 | |
| 641 | dbgp_printk("Found EHCI debug port on %02x:%02x.%1x\n", bus, slot, |
| 642 | func); |
| 643 | |
| 644 | debug_port = read_pci_config(bus, slot, func, cap); |
| 645 | bar = (debug_port >> 29) & 0x7; |
| 646 | bar = (bar * 4) + 0xc; |
| 647 | offset = (debug_port >> 16) & 0xfff; |
| 648 | dbgp_printk("bar: %02x offset: %03x\n", bar, offset); |
| 649 | if (bar != PCI_BASE_ADDRESS_0) { |
| 650 | dbgp_printk("only debug ports on bar 1 handled.\n"); |
| 651 | |
| 652 | return -1; |
| 653 | } |
| 654 | |
| 655 | bar_val = read_pci_config(bus, slot, func, PCI_BASE_ADDRESS_0); |
| 656 | dbgp_printk("bar_val: %02x offset: %03x\n", bar_val, offset); |
| 657 | if (bar_val & ~PCI_BASE_ADDRESS_MEM_MASK) { |
| 658 | dbgp_printk("only simple 32bit mmio bars supported\n"); |
| 659 | |
| 660 | return -1; |
| 661 | } |
| 662 | |
| 663 | /* double check if the mem space is enabled */ |
| 664 | byte = read_pci_config_byte(bus, slot, func, 0x04); |
| 665 | if (!(byte & 0x2)) { |
| 666 | byte |= 0x02; |
| 667 | write_pci_config_byte(bus, slot, func, 0x04, byte); |
| 668 | dbgp_printk("mmio for ehci enabled\n"); |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * FIXME I don't have the bar size so just guess PAGE_SIZE is more |
| 673 | * than enough. 1K is the biggest I have seen. |
| 674 | */ |
| 675 | set_fixmap_nocache(FIX_DBGP_BASE, bar_val & PAGE_MASK); |
| 676 | ehci_bar = (void __iomem *)__fix_to_virt(FIX_DBGP_BASE); |
| 677 | ehci_bar += bar_val & ~PAGE_MASK; |
| 678 | dbgp_printk("ehci_bar: %p\n", ehci_bar); |
| 679 | |
| 680 | ehci_caps = ehci_bar; |
| 681 | ehci_regs = ehci_bar + HC_LENGTH(readl(&ehci_caps->hc_capbase)); |
| 682 | ehci_debug = ehci_bar + offset; |
| 683 | ehci_dev.bus = bus; |
| 684 | ehci_dev.slot = slot; |
| 685 | ehci_dev.func = func; |
| 686 | |
| 687 | detect_set_debug_port(); |
| 688 | |
| 689 | ret = ehci_setup(); |
| 690 | if (ret < 0) { |
| 691 | dbgp_printk("ehci_setup failed\n"); |
| 692 | ehci_debug = NULL; |
| 693 | |
| 694 | return -1; |
| 695 | } |
| 696 | |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | static void early_dbgp_write(struct console *con, const char *str, u32 n) |
| 701 | { |
| 702 | int chunk, ret; |
| 703 | |
| 704 | if (!ehci_debug) |
| 705 | return; |
| 706 | while (n > 0) { |
| 707 | chunk = n; |
| 708 | if (chunk > DBGP_MAX_PACKET) |
| 709 | chunk = DBGP_MAX_PACKET; |
| 710 | ret = dbgp_bulk_write(USB_DEBUG_DEVNUM, |
| 711 | dbgp_endpoint_out, str, chunk); |
| 712 | str += chunk; |
| 713 | n -= chunk; |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | struct console early_dbgp_console = { |
| 718 | .name = "earlydbg", |
| 719 | .write = early_dbgp_write, |
| 720 | .flags = CON_PRINTBUFFER, |
| 721 | .index = -1, |
| 722 | }; |
| 723 | |