1 /*****************************************************************************/ 2 /* 3 * moxa.c -- MOXA Intellio family multiport serial driver. 4 * 5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com). 6 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com> 7 * 8 * This code is loosely based on the Linux serial driver, written by 9 * Linus Torvalds, Theodore T'so and others. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 */ 16 17 /* 18 * MOXA Intellio Series Driver 19 * for : LINUX 20 * date : 1999/1/7 21 * version : 5.1 22 */ 23 24 #include <linux/module.h> 25 #include <linux/types.h> 26 #include <linux/mm.h> 27 #include <linux/ioport.h> 28 #include <linux/errno.h> 29 #include <linux/firmware.h> 30 #include <linux/signal.h> 31 #include <linux/sched.h> 32 #include <linux/timer.h> 33 #include <linux/interrupt.h> 34 #include <linux/tty.h> 35 #include <linux/tty_flip.h> 36 #include <linux/major.h> 37 #include <linux/string.h> 38 #include <linux/fcntl.h> 39 #include <linux/ptrace.h> 40 #include <linux/serial.h> 41 #include <linux/tty_driver.h> 42 #include <linux/delay.h> 43 #include <linux/pci.h> 44 #include <linux/init.h> 45 #include <linux/bitops.h> 46 #include <linux/slab.h> 47 #include <linux/ratelimit.h> 48 49 #include <asm/io.h> 50 #include <asm/uaccess.h> 51 52 #include "moxa.h" 53 54 #define MOXA_VERSION "6.0k" 55 56 #define MOXA_FW_HDRLEN 32 57 58 #define MOXAMAJOR 172 59 60 #define MAX_BOARDS 4 /* Don't change this value */ 61 #define MAX_PORTS_PER_BOARD 32 /* Don't change this value */ 62 #define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD) 63 64 #define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \ 65 (brd)->boardType == MOXA_BOARD_C320_PCI) 66 67 /* 68 * Define the Moxa PCI vendor and device IDs. 69 */ 70 #define MOXA_BUS_TYPE_ISA 0 71 #define MOXA_BUS_TYPE_PCI 1 72 73 enum { 74 MOXA_BOARD_C218_PCI = 1, 75 MOXA_BOARD_C218_ISA, 76 MOXA_BOARD_C320_PCI, 77 MOXA_BOARD_C320_ISA, 78 MOXA_BOARD_CP204J, 79 }; 80 81 static char *moxa_brdname[] = 82 { 83 "C218 Turbo PCI series", 84 "C218 Turbo ISA series", 85 "C320 Turbo PCI series", 86 "C320 Turbo ISA series", 87 "CP-204J series", 88 }; 89 90 #ifdef CONFIG_PCI 91 static struct pci_device_id moxa_pcibrds[] = { 92 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218), 93 .driver_data = MOXA_BOARD_C218_PCI }, 94 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320), 95 .driver_data = MOXA_BOARD_C320_PCI }, 96 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J), 97 .driver_data = MOXA_BOARD_CP204J }, 98 { 0 } 99 }; 100 MODULE_DEVICE_TABLE(pci, moxa_pcibrds); 101 #endif /* CONFIG_PCI */ 102 103 struct moxa_port; 104 105 static struct moxa_board_conf { 106 int boardType; 107 int numPorts; 108 int busType; 109 110 unsigned int ready; 111 112 struct moxa_port *ports; 113 114 void __iomem *basemem; 115 void __iomem *intNdx; 116 void __iomem *intPend; 117 void __iomem *intTable; 118 } moxa_boards[MAX_BOARDS]; 119 120 struct mxser_mstatus { 121 tcflag_t cflag; 122 int cts; 123 int dsr; 124 int ri; 125 int dcd; 126 }; 127 128 struct moxaq_str { 129 int inq; 130 int outq; 131 }; 132 133 struct moxa_port { 134 struct tty_port port; 135 struct moxa_board_conf *board; 136 void __iomem *tableAddr; 137 138 int type; 139 int cflag; 140 unsigned long statusflags; 141 142 u8 DCDState; /* Protected by the port lock */ 143 u8 lineCtrl; 144 u8 lowChkFlag; 145 }; 146 147 struct mon_str { 148 int tick; 149 int rxcnt[MAX_PORTS]; 150 int txcnt[MAX_PORTS]; 151 }; 152 153 /* statusflags */ 154 #define TXSTOPPED 1 155 #define LOWWAIT 2 156 #define EMPTYWAIT 3 157 158 #define SERIAL_DO_RESTART 159 160 #define WAKEUP_CHARS 256 161 162 static int ttymajor = MOXAMAJOR; 163 static struct mon_str moxaLog; 164 static unsigned int moxaFuncTout = HZ / 2; 165 static unsigned int moxaLowWaterChk; 166 static DEFINE_MUTEX(moxa_openlock); 167 static DEFINE_SPINLOCK(moxa_lock); 168 169 static unsigned long baseaddr[MAX_BOARDS]; 170 static unsigned int type[MAX_BOARDS]; 171 static unsigned int numports[MAX_BOARDS]; 172 static struct tty_port moxa_service_port; 173 174 MODULE_AUTHOR("William Chen"); 175 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver"); 176 MODULE_LICENSE("GPL"); 177 MODULE_FIRMWARE("c218tunx.cod"); 178 MODULE_FIRMWARE("cp204unx.cod"); 179 MODULE_FIRMWARE("c320tunx.cod"); 180 181 module_param_array(type, uint, NULL, 0); 182 MODULE_PARM_DESC(type, "card type: C218=2, C320=4"); 183 module_param_array(baseaddr, ulong, NULL, 0); 184 MODULE_PARM_DESC(baseaddr, "base address"); 185 module_param_array(numports, uint, NULL, 0); 186 MODULE_PARM_DESC(numports, "numports (ignored for C218)"); 187 188 module_param(ttymajor, int, 0); 189 190 /* 191 * static functions: 192 */ 193 static int moxa_open(struct tty_struct *, struct file *); 194 static void moxa_close(struct tty_struct *, struct file *); 195 static int moxa_write(struct tty_struct *, const unsigned char *, int); 196 static int moxa_write_room(struct tty_struct *); 197 static void moxa_flush_buffer(struct tty_struct *); 198 static int moxa_chars_in_buffer(struct tty_struct *); 199 static void moxa_set_termios(struct tty_struct *, struct ktermios *); 200 static void moxa_stop(struct tty_struct *); 201 static void moxa_start(struct tty_struct *); 202 static void moxa_hangup(struct tty_struct *); 203 static int moxa_tiocmget(struct tty_struct *tty); 204 static int moxa_tiocmset(struct tty_struct *tty, 205 unsigned int set, unsigned int clear); 206 static void moxa_poll(unsigned long); 207 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *); 208 static void moxa_shutdown(struct tty_port *); 209 static int moxa_carrier_raised(struct tty_port *); 210 static void moxa_dtr_rts(struct tty_port *, int); 211 /* 212 * moxa board interface functions: 213 */ 214 static void MoxaPortEnable(struct moxa_port *); 215 static void MoxaPortDisable(struct moxa_port *); 216 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t); 217 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *); 218 static void MoxaPortLineCtrl(struct moxa_port *, int, int); 219 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int); 220 static int MoxaPortLineStatus(struct moxa_port *); 221 static void MoxaPortFlushData(struct moxa_port *, int); 222 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int); 223 static int MoxaPortReadData(struct moxa_port *); 224 static int MoxaPortTxQueue(struct moxa_port *); 225 static int MoxaPortRxQueue(struct moxa_port *); 226 static int MoxaPortTxFree(struct moxa_port *); 227 static void MoxaPortTxDisable(struct moxa_port *); 228 static void MoxaPortTxEnable(struct moxa_port *); 229 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *); 230 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *); 231 static void MoxaSetFifo(struct moxa_port *port, int enable); 232 233 /* 234 * I/O functions 235 */ 236 237 static DEFINE_SPINLOCK(moxafunc_lock); 238 239 static void moxa_wait_finish(void __iomem *ofsAddr) 240 { 241 unsigned long end = jiffies + moxaFuncTout; 242 243 while (readw(ofsAddr + FuncCode) != 0) 244 if (time_after(jiffies, end)) 245 return; 246 if (readw(ofsAddr + FuncCode) != 0) 247 printk_ratelimited(KERN_WARNING "moxa function expired\n"); 248 } 249 250 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg) 251 { 252 unsigned long flags; 253 spin_lock_irqsave(&moxafunc_lock, flags); 254 writew(arg, ofsAddr + FuncArg); 255 writew(cmd, ofsAddr + FuncCode); 256 moxa_wait_finish(ofsAddr); 257 spin_unlock_irqrestore(&moxafunc_lock, flags); 258 } 259 260 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg) 261 { 262 unsigned long flags; 263 u16 ret; 264 spin_lock_irqsave(&moxafunc_lock, flags); 265 writew(arg, ofsAddr + FuncArg); 266 writew(cmd, ofsAddr + FuncCode); 267 moxa_wait_finish(ofsAddr); 268 ret = readw(ofsAddr + FuncArg); 269 spin_unlock_irqrestore(&moxafunc_lock, flags); 270 return ret; 271 } 272 273 static void moxa_low_water_check(void __iomem *ofsAddr) 274 { 275 u16 rptr, wptr, mask, len; 276 277 if (readb(ofsAddr + FlagStat) & Xoff_state) { 278 rptr = readw(ofsAddr + RXrptr); 279 wptr = readw(ofsAddr + RXwptr); 280 mask = readw(ofsAddr + RX_mask); 281 len = (wptr - rptr) & mask; 282 if (len <= Low_water) 283 moxafunc(ofsAddr, FC_SendXon, 0); 284 } 285 } 286 287 /* 288 * TTY operations 289 */ 290 291 static int moxa_ioctl(struct tty_struct *tty, 292 unsigned int cmd, unsigned long arg) 293 { 294 struct moxa_port *ch = tty->driver_data; 295 void __user *argp = (void __user *)arg; 296 int status, ret = 0; 297 298 if (tty->index == MAX_PORTS) { 299 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE && 300 cmd != MOXA_GETMSTATUS) 301 return -EINVAL; 302 } else if (!ch) 303 return -ENODEV; 304 305 switch (cmd) { 306 case MOXA_GETDATACOUNT: 307 moxaLog.tick = jiffies; 308 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog))) 309 ret = -EFAULT; 310 break; 311 case MOXA_FLUSH_QUEUE: 312 MoxaPortFlushData(ch, arg); 313 break; 314 case MOXA_GET_IOQUEUE: { 315 struct moxaq_str __user *argm = argp; 316 struct moxaq_str tmp; 317 struct moxa_port *p; 318 unsigned int i, j; 319 320 for (i = 0; i < MAX_BOARDS; i++) { 321 p = moxa_boards[i].ports; 322 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { 323 memset(&tmp, 0, sizeof(tmp)); 324 spin_lock_bh(&moxa_lock); 325 if (moxa_boards[i].ready) { 326 tmp.inq = MoxaPortRxQueue(p); 327 tmp.outq = MoxaPortTxQueue(p); 328 } 329 spin_unlock_bh(&moxa_lock); 330 if (copy_to_user(argm, &tmp, sizeof(tmp))) 331 return -EFAULT; 332 } 333 } 334 break; 335 } case MOXA_GET_OQUEUE: 336 status = MoxaPortTxQueue(ch); 337 ret = put_user(status, (unsigned long __user *)argp); 338 break; 339 case MOXA_GET_IQUEUE: 340 status = MoxaPortRxQueue(ch); 341 ret = put_user(status, (unsigned long __user *)argp); 342 break; 343 case MOXA_GETMSTATUS: { 344 struct mxser_mstatus __user *argm = argp; 345 struct mxser_mstatus tmp; 346 struct moxa_port *p; 347 unsigned int i, j; 348 349 for (i = 0; i < MAX_BOARDS; i++) { 350 p = moxa_boards[i].ports; 351 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { 352 struct tty_struct *ttyp; 353 memset(&tmp, 0, sizeof(tmp)); 354 spin_lock_bh(&moxa_lock); 355 if (!moxa_boards[i].ready) { 356 spin_unlock_bh(&moxa_lock); 357 goto copy; 358 } 359 360 status = MoxaPortLineStatus(p); 361 spin_unlock_bh(&moxa_lock); 362 363 if (status & 1) 364 tmp.cts = 1; 365 if (status & 2) 366 tmp.dsr = 1; 367 if (status & 4) 368 tmp.dcd = 1; 369 370 ttyp = tty_port_tty_get(&p->port); 371 if (!ttyp) 372 tmp.cflag = p->cflag; 373 else 374 tmp.cflag = ttyp->termios.c_cflag; 375 tty_kref_put(ttyp); 376 copy: 377 if (copy_to_user(argm, &tmp, sizeof(tmp))) 378 return -EFAULT; 379 } 380 } 381 break; 382 } 383 case TIOCGSERIAL: 384 mutex_lock(&ch->port.mutex); 385 ret = moxa_get_serial_info(ch, argp); 386 mutex_unlock(&ch->port.mutex); 387 break; 388 case TIOCSSERIAL: 389 mutex_lock(&ch->port.mutex); 390 ret = moxa_set_serial_info(ch, argp); 391 mutex_unlock(&ch->port.mutex); 392 break; 393 default: 394 ret = -ENOIOCTLCMD; 395 } 396 return ret; 397 } 398 399 static int moxa_break_ctl(struct tty_struct *tty, int state) 400 { 401 struct moxa_port *port = tty->driver_data; 402 403 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak, 404 Magic_code); 405 return 0; 406 } 407 408 static const struct tty_operations moxa_ops = { 409 .open = moxa_open, 410 .close = moxa_close, 411 .write = moxa_write, 412 .write_room = moxa_write_room, 413 .flush_buffer = moxa_flush_buffer, 414 .chars_in_buffer = moxa_chars_in_buffer, 415 .ioctl = moxa_ioctl, 416 .set_termios = moxa_set_termios, 417 .stop = moxa_stop, 418 .start = moxa_start, 419 .hangup = moxa_hangup, 420 .break_ctl = moxa_break_ctl, 421 .tiocmget = moxa_tiocmget, 422 .tiocmset = moxa_tiocmset, 423 }; 424 425 static const struct tty_port_operations moxa_port_ops = { 426 .carrier_raised = moxa_carrier_raised, 427 .dtr_rts = moxa_dtr_rts, 428 .shutdown = moxa_shutdown, 429 }; 430 431 static struct tty_driver *moxaDriver; 432 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0); 433 434 /* 435 * HW init 436 */ 437 438 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model) 439 { 440 switch (brd->boardType) { 441 case MOXA_BOARD_C218_ISA: 442 case MOXA_BOARD_C218_PCI: 443 if (model != 1) 444 goto err; 445 break; 446 case MOXA_BOARD_CP204J: 447 if (model != 3) 448 goto err; 449 break; 450 default: 451 if (model != 2) 452 goto err; 453 break; 454 } 455 return 0; 456 err: 457 return -EINVAL; 458 } 459 460 static int moxa_check_fw(const void *ptr) 461 { 462 const __le16 *lptr = ptr; 463 464 if (*lptr != cpu_to_le16(0x7980)) 465 return -EINVAL; 466 467 return 0; 468 } 469 470 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf, 471 size_t len) 472 { 473 void __iomem *baseAddr = brd->basemem; 474 u16 tmp; 475 476 writeb(HW_reset, baseAddr + Control_reg); /* reset */ 477 msleep(10); 478 memset_io(baseAddr, 0, 4096); 479 memcpy_toio(baseAddr, buf, len); /* download BIOS */ 480 writeb(0, baseAddr + Control_reg); /* restart */ 481 482 msleep(2000); 483 484 switch (brd->boardType) { 485 case MOXA_BOARD_C218_ISA: 486 case MOXA_BOARD_C218_PCI: 487 tmp = readw(baseAddr + C218_key); 488 if (tmp != C218_KeyCode) 489 goto err; 490 break; 491 case MOXA_BOARD_CP204J: 492 tmp = readw(baseAddr + C218_key); 493 if (tmp != CP204J_KeyCode) 494 goto err; 495 break; 496 default: 497 tmp = readw(baseAddr + C320_key); 498 if (tmp != C320_KeyCode) 499 goto err; 500 tmp = readw(baseAddr + C320_status); 501 if (tmp != STS_init) { 502 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic " 503 "module not found\n"); 504 return -EIO; 505 } 506 break; 507 } 508 509 return 0; 510 err: 511 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n"); 512 return -EIO; 513 } 514 515 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr, 516 size_t len) 517 { 518 void __iomem *baseAddr = brd->basemem; 519 520 if (len < 7168) { 521 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n"); 522 return -EINVAL; 523 } 524 525 writew(len - 7168 - 2, baseAddr + C320bapi_len); 526 writeb(1, baseAddr + Control_reg); /* Select Page 1 */ 527 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168); 528 writeb(2, baseAddr + Control_reg); /* Select Page 2 */ 529 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168); 530 531 return 0; 532 } 533 534 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr, 535 size_t len) 536 { 537 void __iomem *baseAddr = brd->basemem; 538 const __le16 *uptr = ptr; 539 size_t wlen, len2, j; 540 unsigned long key, loadbuf, loadlen, checksum, checksum_ok; 541 unsigned int i, retry; 542 u16 usum, keycode; 543 544 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode : 545 C218_KeyCode; 546 547 switch (brd->boardType) { 548 case MOXA_BOARD_CP204J: 549 case MOXA_BOARD_C218_ISA: 550 case MOXA_BOARD_C218_PCI: 551 key = C218_key; 552 loadbuf = C218_LoadBuf; 553 loadlen = C218DLoad_len; 554 checksum = C218check_sum; 555 checksum_ok = C218chksum_ok; 556 break; 557 default: 558 key = C320_key; 559 keycode = C320_KeyCode; 560 loadbuf = C320_LoadBuf; 561 loadlen = C320DLoad_len; 562 checksum = C320check_sum; 563 checksum_ok = C320chksum_ok; 564 break; 565 } 566 567 usum = 0; 568 wlen = len >> 1; 569 for (i = 0; i < wlen; i++) 570 usum += le16_to_cpu(uptr[i]); 571 retry = 0; 572 do { 573 wlen = len >> 1; 574 j = 0; 575 while (wlen) { 576 len2 = (wlen > 2048) ? 2048 : wlen; 577 wlen -= len2; 578 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1); 579 j += len2 << 1; 580 581 writew(len2, baseAddr + loadlen); 582 writew(0, baseAddr + key); 583 for (i = 0; i < 100; i++) { 584 if (readw(baseAddr + key) == keycode) 585 break; 586 msleep(10); 587 } 588 if (readw(baseAddr + key) != keycode) 589 return -EIO; 590 } 591 writew(0, baseAddr + loadlen); 592 writew(usum, baseAddr + checksum); 593 writew(0, baseAddr + key); 594 for (i = 0; i < 100; i++) { 595 if (readw(baseAddr + key) == keycode) 596 break; 597 msleep(10); 598 } 599 retry++; 600 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3)); 601 if (readb(baseAddr + checksum_ok) != 1) 602 return -EIO; 603 604 writew(0, baseAddr + key); 605 for (i = 0; i < 600; i++) { 606 if (readw(baseAddr + Magic_no) == Magic_code) 607 break; 608 msleep(10); 609 } 610 if (readw(baseAddr + Magic_no) != Magic_code) 611 return -EIO; 612 613 if (MOXA_IS_320(brd)) { 614 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */ 615 writew(0x3800, baseAddr + TMS320_PORT1); 616 writew(0x3900, baseAddr + TMS320_PORT2); 617 writew(28499, baseAddr + TMS320_CLOCK); 618 } else { 619 writew(0x3200, baseAddr + TMS320_PORT1); 620 writew(0x3400, baseAddr + TMS320_PORT2); 621 writew(19999, baseAddr + TMS320_CLOCK); 622 } 623 } 624 writew(1, baseAddr + Disable_IRQ); 625 writew(0, baseAddr + Magic_no); 626 for (i = 0; i < 500; i++) { 627 if (readw(baseAddr + Magic_no) == Magic_code) 628 break; 629 msleep(10); 630 } 631 if (readw(baseAddr + Magic_no) != Magic_code) 632 return -EIO; 633 634 if (MOXA_IS_320(brd)) { 635 j = readw(baseAddr + Module_cnt); 636 if (j <= 0) 637 return -EIO; 638 brd->numPorts = j * 8; 639 writew(j, baseAddr + Module_no); 640 writew(0, baseAddr + Magic_no); 641 for (i = 0; i < 600; i++) { 642 if (readw(baseAddr + Magic_no) == Magic_code) 643 break; 644 msleep(10); 645 } 646 if (readw(baseAddr + Magic_no) != Magic_code) 647 return -EIO; 648 } 649 brd->intNdx = baseAddr + IRQindex; 650 brd->intPend = baseAddr + IRQpending; 651 brd->intTable = baseAddr + IRQtable; 652 653 return 0; 654 } 655 656 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr, 657 size_t len) 658 { 659 void __iomem *ofsAddr, *baseAddr = brd->basemem; 660 struct moxa_port *port; 661 int retval, i; 662 663 if (len % 2) { 664 printk(KERN_ERR "MOXA: bios length is not even\n"); 665 return -EINVAL; 666 } 667 668 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */ 669 if (retval) 670 return retval; 671 672 switch (brd->boardType) { 673 case MOXA_BOARD_C218_ISA: 674 case MOXA_BOARD_C218_PCI: 675 case MOXA_BOARD_CP204J: 676 port = brd->ports; 677 for (i = 0; i < brd->numPorts; i++, port++) { 678 port->board = brd; 679 port->DCDState = 0; 680 port->tableAddr = baseAddr + Extern_table + 681 Extern_size * i; 682 ofsAddr = port->tableAddr; 683 writew(C218rx_mask, ofsAddr + RX_mask); 684 writew(C218tx_mask, ofsAddr + TX_mask); 685 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb); 686 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb); 687 688 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb); 689 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb); 690 691 } 692 break; 693 default: 694 port = brd->ports; 695 for (i = 0; i < brd->numPorts; i++, port++) { 696 port->board = brd; 697 port->DCDState = 0; 698 port->tableAddr = baseAddr + Extern_table + 699 Extern_size * i; 700 ofsAddr = port->tableAddr; 701 switch (brd->numPorts) { 702 case 8: 703 writew(C320p8rx_mask, ofsAddr + RX_mask); 704 writew(C320p8tx_mask, ofsAddr + TX_mask); 705 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb); 706 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb); 707 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb); 708 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb); 709 710 break; 711 case 16: 712 writew(C320p16rx_mask, ofsAddr + RX_mask); 713 writew(C320p16tx_mask, ofsAddr + TX_mask); 714 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb); 715 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb); 716 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb); 717 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb); 718 break; 719 720 case 24: 721 writew(C320p24rx_mask, ofsAddr + RX_mask); 722 writew(C320p24tx_mask, ofsAddr + TX_mask); 723 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb); 724 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb); 725 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb); 726 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb); 727 break; 728 case 32: 729 writew(C320p32rx_mask, ofsAddr + RX_mask); 730 writew(C320p32tx_mask, ofsAddr + TX_mask); 731 writew(C320p32tx_ofs, ofsAddr + Ofs_txb); 732 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb); 733 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb); 734 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb); 735 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb); 736 break; 737 } 738 } 739 break; 740 } 741 return 0; 742 } 743 744 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw) 745 { 746 const void *ptr = fw->data; 747 char rsn[64]; 748 u16 lens[5]; 749 size_t len; 750 unsigned int a, lenp, lencnt; 751 int ret = -EINVAL; 752 struct { 753 __le32 magic; /* 0x34303430 */ 754 u8 reserved1[2]; 755 u8 type; /* UNIX = 3 */ 756 u8 model; /* C218T=1, C320T=2, CP204=3 */ 757 u8 reserved2[8]; 758 __le16 len[5]; 759 } const *hdr = ptr; 760 761 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens)); 762 763 if (fw->size < MOXA_FW_HDRLEN) { 764 strcpy(rsn, "too short (even header won't fit)"); 765 goto err; 766 } 767 if (hdr->magic != cpu_to_le32(0x30343034)) { 768 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic)); 769 goto err; 770 } 771 if (hdr->type != 3) { 772 sprintf(rsn, "not for linux, type is %u", hdr->type); 773 goto err; 774 } 775 if (moxa_check_fw_model(brd, hdr->model)) { 776 sprintf(rsn, "not for this card, model is %u", hdr->model); 777 goto err; 778 } 779 780 len = MOXA_FW_HDRLEN; 781 lencnt = hdr->model == 2 ? 5 : 3; 782 for (a = 0; a < ARRAY_SIZE(lens); a++) { 783 lens[a] = le16_to_cpu(hdr->len[a]); 784 if (lens[a] && len + lens[a] <= fw->size && 785 moxa_check_fw(&fw->data[len])) 786 printk(KERN_WARNING "MOXA firmware: unexpected input " 787 "at offset %u, but going on\n", (u32)len); 788 if (!lens[a] && a < lencnt) { 789 sprintf(rsn, "too few entries in fw file"); 790 goto err; 791 } 792 len += lens[a]; 793 } 794 795 if (len != fw->size) { 796 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size, 797 (u32)len); 798 goto err; 799 } 800 801 ptr += MOXA_FW_HDRLEN; 802 lenp = 0; /* bios */ 803 804 strcpy(rsn, "read above"); 805 806 ret = moxa_load_bios(brd, ptr, lens[lenp]); 807 if (ret) 808 goto err; 809 810 /* we skip the tty section (lens[1]), since we don't need it */ 811 ptr += lens[lenp] + lens[lenp + 1]; 812 lenp += 2; /* comm */ 813 814 if (hdr->model == 2) { 815 ret = moxa_load_320b(brd, ptr, lens[lenp]); 816 if (ret) 817 goto err; 818 /* skip another tty */ 819 ptr += lens[lenp] + lens[lenp + 1]; 820 lenp += 2; 821 } 822 823 ret = moxa_load_code(brd, ptr, lens[lenp]); 824 if (ret) 825 goto err; 826 827 return 0; 828 err: 829 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn); 830 return ret; 831 } 832 833 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev) 834 { 835 const struct firmware *fw; 836 const char *file; 837 struct moxa_port *p; 838 unsigned int i, first_idx; 839 int ret; 840 841 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports), 842 GFP_KERNEL); 843 if (brd->ports == NULL) { 844 printk(KERN_ERR "cannot allocate memory for ports\n"); 845 ret = -ENOMEM; 846 goto err; 847 } 848 849 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) { 850 tty_port_init(&p->port); 851 p->port.ops = &moxa_port_ops; 852 p->type = PORT_16550A; 853 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; 854 } 855 856 switch (brd->boardType) { 857 case MOXA_BOARD_C218_ISA: 858 case MOXA_BOARD_C218_PCI: 859 file = "c218tunx.cod"; 860 break; 861 case MOXA_BOARD_CP204J: 862 file = "cp204unx.cod"; 863 break; 864 default: 865 file = "c320tunx.cod"; 866 break; 867 } 868 869 ret = request_firmware(&fw, file, dev); 870 if (ret) { 871 printk(KERN_ERR "MOXA: request_firmware failed. Make sure " 872 "you've placed '%s' file into your firmware " 873 "loader directory (e.g. /lib/firmware)\n", 874 file); 875 goto err_free; 876 } 877 878 ret = moxa_load_fw(brd, fw); 879 880 release_firmware(fw); 881 882 if (ret) 883 goto err_free; 884 885 spin_lock_bh(&moxa_lock); 886 brd->ready = 1; 887 if (!timer_pending(&moxaTimer)) 888 mod_timer(&moxaTimer, jiffies + HZ / 50); 889 spin_unlock_bh(&moxa_lock); 890 891 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD; 892 for (i = 0; i < brd->numPorts; i++) 893 tty_port_register_device(&brd->ports[i].port, moxaDriver, 894 first_idx + i, dev); 895 896 return 0; 897 err_free: 898 for (i = 0; i < MAX_PORTS_PER_BOARD; i++) 899 tty_port_destroy(&brd->ports[i].port); 900 kfree(brd->ports); 901 err: 902 return ret; 903 } 904 905 static void moxa_board_deinit(struct moxa_board_conf *brd) 906 { 907 unsigned int a, opened, first_idx; 908 909 mutex_lock(&moxa_openlock); 910 spin_lock_bh(&moxa_lock); 911 brd->ready = 0; 912 spin_unlock_bh(&moxa_lock); 913 914 /* pci hot-un-plug support */ 915 for (a = 0; a < brd->numPorts; a++) 916 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) { 917 struct tty_struct *tty = tty_port_tty_get( 918 &brd->ports[a].port); 919 if (tty) { 920 tty_hangup(tty); 921 tty_kref_put(tty); 922 } 923 } 924 for (a = 0; a < MAX_PORTS_PER_BOARD; a++) 925 tty_port_destroy(&brd->ports[a].port); 926 while (1) { 927 opened = 0; 928 for (a = 0; a < brd->numPorts; a++) 929 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) 930 opened++; 931 mutex_unlock(&moxa_openlock); 932 if (!opened) 933 break; 934 msleep(50); 935 mutex_lock(&moxa_openlock); 936 } 937 938 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD; 939 for (a = 0; a < brd->numPorts; a++) 940 tty_unregister_device(moxaDriver, first_idx + a); 941 942 iounmap(brd->basemem); 943 brd->basemem = NULL; 944 kfree(brd->ports); 945 } 946 947 #ifdef CONFIG_PCI 948 static int moxa_pci_probe(struct pci_dev *pdev, 949 const struct pci_device_id *ent) 950 { 951 struct moxa_board_conf *board; 952 unsigned int i; 953 int board_type = ent->driver_data; 954 int retval; 955 956 retval = pci_enable_device(pdev); 957 if (retval) { 958 dev_err(&pdev->dev, "can't enable pci device\n"); 959 goto err; 960 } 961 962 for (i = 0; i < MAX_BOARDS; i++) 963 if (moxa_boards[i].basemem == NULL) 964 break; 965 966 retval = -ENODEV; 967 if (i >= MAX_BOARDS) { 968 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards " 969 "found. Board is ignored.\n", MAX_BOARDS); 970 goto err; 971 } 972 973 board = &moxa_boards[i]; 974 975 retval = pci_request_region(pdev, 2, "moxa-base"); 976 if (retval) { 977 dev_err(&pdev->dev, "can't request pci region 2\n"); 978 goto err; 979 } 980 981 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000); 982 if (board->basemem == NULL) { 983 dev_err(&pdev->dev, "can't remap io space 2\n"); 984 retval = -ENOMEM; 985 goto err_reg; 986 } 987 988 board->boardType = board_type; 989 switch (board_type) { 990 case MOXA_BOARD_C218_ISA: 991 case MOXA_BOARD_C218_PCI: 992 board->numPorts = 8; 993 break; 994 995 case MOXA_BOARD_CP204J: 996 board->numPorts = 4; 997 break; 998 default: 999 board->numPorts = 0; 1000 break; 1001 } 1002 board->busType = MOXA_BUS_TYPE_PCI; 1003 1004 retval = moxa_init_board(board, &pdev->dev); 1005 if (retval) 1006 goto err_base; 1007 1008 pci_set_drvdata(pdev, board); 1009 1010 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n", 1011 moxa_brdname[board_type - 1], board->numPorts); 1012 1013 return 0; 1014 err_base: 1015 iounmap(board->basemem); 1016 board->basemem = NULL; 1017 err_reg: 1018 pci_release_region(pdev, 2); 1019 err: 1020 return retval; 1021 } 1022 1023 static void moxa_pci_remove(struct pci_dev *pdev) 1024 { 1025 struct moxa_board_conf *brd = pci_get_drvdata(pdev); 1026 1027 moxa_board_deinit(brd); 1028 1029 pci_release_region(pdev, 2); 1030 } 1031 1032 static struct pci_driver moxa_pci_driver = { 1033 .name = "moxa", 1034 .id_table = moxa_pcibrds, 1035 .probe = moxa_pci_probe, 1036 .remove = moxa_pci_remove 1037 }; 1038 #endif /* CONFIG_PCI */ 1039 1040 static int __init moxa_init(void) 1041 { 1042 unsigned int isabrds = 0; 1043 int retval = 0; 1044 struct moxa_board_conf *brd = moxa_boards; 1045 unsigned int i; 1046 1047 printk(KERN_INFO "MOXA Intellio family driver version %s\n", 1048 MOXA_VERSION); 1049 1050 tty_port_init(&moxa_service_port); 1051 1052 moxaDriver = tty_alloc_driver(MAX_PORTS + 1, 1053 TTY_DRIVER_REAL_RAW | 1054 TTY_DRIVER_DYNAMIC_DEV); 1055 if (IS_ERR(moxaDriver)) 1056 return PTR_ERR(moxaDriver); 1057 1058 moxaDriver->name = "ttyMX"; 1059 moxaDriver->major = ttymajor; 1060 moxaDriver->minor_start = 0; 1061 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL; 1062 moxaDriver->subtype = SERIAL_TYPE_NORMAL; 1063 moxaDriver->init_termios = tty_std_termios; 1064 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL; 1065 moxaDriver->init_termios.c_ispeed = 9600; 1066 moxaDriver->init_termios.c_ospeed = 9600; 1067 tty_set_operations(moxaDriver, &moxa_ops); 1068 /* Having one more port only for ioctls is ugly */ 1069 tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS); 1070 1071 if (tty_register_driver(moxaDriver)) { 1072 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n"); 1073 put_tty_driver(moxaDriver); 1074 return -1; 1075 } 1076 1077 /* Find the boards defined from module args. */ 1078 1079 for (i = 0; i < MAX_BOARDS; i++) { 1080 if (!baseaddr[i]) 1081 break; 1082 if (type[i] == MOXA_BOARD_C218_ISA || 1083 type[i] == MOXA_BOARD_C320_ISA) { 1084 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n", 1085 isabrds + 1, moxa_brdname[type[i] - 1], 1086 baseaddr[i]); 1087 brd->boardType = type[i]; 1088 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 : 1089 numports[i]; 1090 brd->busType = MOXA_BUS_TYPE_ISA; 1091 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000); 1092 if (!brd->basemem) { 1093 printk(KERN_ERR "MOXA: can't remap %lx\n", 1094 baseaddr[i]); 1095 continue; 1096 } 1097 if (moxa_init_board(brd, NULL)) { 1098 iounmap(brd->basemem); 1099 brd->basemem = NULL; 1100 continue; 1101 } 1102 1103 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and " 1104 "ready (%u ports, firmware loaded)\n", 1105 baseaddr[i], brd->numPorts); 1106 1107 brd++; 1108 isabrds++; 1109 } 1110 } 1111 1112 #ifdef CONFIG_PCI 1113 retval = pci_register_driver(&moxa_pci_driver); 1114 if (retval) { 1115 printk(KERN_ERR "Can't register MOXA pci driver!\n"); 1116 if (isabrds) 1117 retval = 0; 1118 } 1119 #endif 1120 1121 return retval; 1122 } 1123 1124 static void __exit moxa_exit(void) 1125 { 1126 unsigned int i; 1127 1128 #ifdef CONFIG_PCI 1129 pci_unregister_driver(&moxa_pci_driver); 1130 #endif 1131 1132 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */ 1133 if (moxa_boards[i].ready) 1134 moxa_board_deinit(&moxa_boards[i]); 1135 1136 del_timer_sync(&moxaTimer); 1137 1138 if (tty_unregister_driver(moxaDriver)) 1139 printk(KERN_ERR "Couldn't unregister MOXA Intellio family " 1140 "serial driver\n"); 1141 put_tty_driver(moxaDriver); 1142 } 1143 1144 module_init(moxa_init); 1145 module_exit(moxa_exit); 1146 1147 static void moxa_shutdown(struct tty_port *port) 1148 { 1149 struct moxa_port *ch = container_of(port, struct moxa_port, port); 1150 MoxaPortDisable(ch); 1151 MoxaPortFlushData(ch, 2); 1152 } 1153 1154 static int moxa_carrier_raised(struct tty_port *port) 1155 { 1156 struct moxa_port *ch = container_of(port, struct moxa_port, port); 1157 int dcd; 1158 1159 spin_lock_irq(&port->lock); 1160 dcd = ch->DCDState; 1161 spin_unlock_irq(&port->lock); 1162 return dcd; 1163 } 1164 1165 static void moxa_dtr_rts(struct tty_port *port, int onoff) 1166 { 1167 struct moxa_port *ch = container_of(port, struct moxa_port, port); 1168 MoxaPortLineCtrl(ch, onoff, onoff); 1169 } 1170 1171 1172 static int moxa_open(struct tty_struct *tty, struct file *filp) 1173 { 1174 struct moxa_board_conf *brd; 1175 struct moxa_port *ch; 1176 int port; 1177 1178 port = tty->index; 1179 if (port == MAX_PORTS) { 1180 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM; 1181 } 1182 if (mutex_lock_interruptible(&moxa_openlock)) 1183 return -ERESTARTSYS; 1184 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD]; 1185 if (!brd->ready) { 1186 mutex_unlock(&moxa_openlock); 1187 return -ENODEV; 1188 } 1189 1190 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) { 1191 mutex_unlock(&moxa_openlock); 1192 return -ENODEV; 1193 } 1194 1195 ch = &brd->ports[port % MAX_PORTS_PER_BOARD]; 1196 ch->port.count++; 1197 tty->driver_data = ch; 1198 tty_port_tty_set(&ch->port, tty); 1199 mutex_lock(&ch->port.mutex); 1200 if (!(ch->port.flags & ASYNC_INITIALIZED)) { 1201 ch->statusflags = 0; 1202 moxa_set_tty_param(tty, &tty->termios); 1203 MoxaPortLineCtrl(ch, 1, 1); 1204 MoxaPortEnable(ch); 1205 MoxaSetFifo(ch, ch->type == PORT_16550A); 1206 ch->port.flags |= ASYNC_INITIALIZED; 1207 } 1208 mutex_unlock(&ch->port.mutex); 1209 mutex_unlock(&moxa_openlock); 1210 1211 return tty_port_block_til_ready(&ch->port, tty, filp); 1212 } 1213 1214 static void moxa_close(struct tty_struct *tty, struct file *filp) 1215 { 1216 struct moxa_port *ch = tty->driver_data; 1217 ch->cflag = tty->termios.c_cflag; 1218 tty_port_close(&ch->port, tty, filp); 1219 } 1220 1221 static int moxa_write(struct tty_struct *tty, 1222 const unsigned char *buf, int count) 1223 { 1224 struct moxa_port *ch = tty->driver_data; 1225 unsigned long flags; 1226 int len; 1227 1228 if (ch == NULL) 1229 return 0; 1230 1231 spin_lock_irqsave(&moxa_lock, flags); 1232 len = MoxaPortWriteData(tty, buf, count); 1233 spin_unlock_irqrestore(&moxa_lock, flags); 1234 1235 set_bit(LOWWAIT, &ch->statusflags); 1236 return len; 1237 } 1238 1239 static int moxa_write_room(struct tty_struct *tty) 1240 { 1241 struct moxa_port *ch; 1242 1243 if (tty->stopped) 1244 return 0; 1245 ch = tty->driver_data; 1246 if (ch == NULL) 1247 return 0; 1248 return MoxaPortTxFree(ch); 1249 } 1250 1251 static void moxa_flush_buffer(struct tty_struct *tty) 1252 { 1253 struct moxa_port *ch = tty->driver_data; 1254 1255 if (ch == NULL) 1256 return; 1257 MoxaPortFlushData(ch, 1); 1258 tty_wakeup(tty); 1259 } 1260 1261 static int moxa_chars_in_buffer(struct tty_struct *tty) 1262 { 1263 struct moxa_port *ch = tty->driver_data; 1264 int chars; 1265 1266 chars = MoxaPortTxQueue(ch); 1267 if (chars) 1268 /* 1269 * Make it possible to wakeup anything waiting for output 1270 * in tty_ioctl.c, etc. 1271 */ 1272 set_bit(EMPTYWAIT, &ch->statusflags); 1273 return chars; 1274 } 1275 1276 static int moxa_tiocmget(struct tty_struct *tty) 1277 { 1278 struct moxa_port *ch = tty->driver_data; 1279 int flag = 0, dtr, rts; 1280 1281 MoxaPortGetLineOut(ch, &dtr, &rts); 1282 if (dtr) 1283 flag |= TIOCM_DTR; 1284 if (rts) 1285 flag |= TIOCM_RTS; 1286 dtr = MoxaPortLineStatus(ch); 1287 if (dtr & 1) 1288 flag |= TIOCM_CTS; 1289 if (dtr & 2) 1290 flag |= TIOCM_DSR; 1291 if (dtr & 4) 1292 flag |= TIOCM_CD; 1293 return flag; 1294 } 1295 1296 static int moxa_tiocmset(struct tty_struct *tty, 1297 unsigned int set, unsigned int clear) 1298 { 1299 struct moxa_port *ch; 1300 int dtr, rts; 1301 1302 mutex_lock(&moxa_openlock); 1303 ch = tty->driver_data; 1304 if (!ch) { 1305 mutex_unlock(&moxa_openlock); 1306 return -EINVAL; 1307 } 1308 1309 MoxaPortGetLineOut(ch, &dtr, &rts); 1310 if (set & TIOCM_RTS) 1311 rts = 1; 1312 if (set & TIOCM_DTR) 1313 dtr = 1; 1314 if (clear & TIOCM_RTS) 1315 rts = 0; 1316 if (clear & TIOCM_DTR) 1317 dtr = 0; 1318 MoxaPortLineCtrl(ch, dtr, rts); 1319 mutex_unlock(&moxa_openlock); 1320 return 0; 1321 } 1322 1323 static void moxa_set_termios(struct tty_struct *tty, 1324 struct ktermios *old_termios) 1325 { 1326 struct moxa_port *ch = tty->driver_data; 1327 1328 if (ch == NULL) 1329 return; 1330 moxa_set_tty_param(tty, old_termios); 1331 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1332 wake_up_interruptible(&ch->port.open_wait); 1333 } 1334 1335 static void moxa_stop(struct tty_struct *tty) 1336 { 1337 struct moxa_port *ch = tty->driver_data; 1338 1339 if (ch == NULL) 1340 return; 1341 MoxaPortTxDisable(ch); 1342 set_bit(TXSTOPPED, &ch->statusflags); 1343 } 1344 1345 1346 static void moxa_start(struct tty_struct *tty) 1347 { 1348 struct moxa_port *ch = tty->driver_data; 1349 1350 if (ch == NULL) 1351 return; 1352 1353 if (!test_bit(TXSTOPPED, &ch->statusflags)) 1354 return; 1355 1356 MoxaPortTxEnable(ch); 1357 clear_bit(TXSTOPPED, &ch->statusflags); 1358 } 1359 1360 static void moxa_hangup(struct tty_struct *tty) 1361 { 1362 struct moxa_port *ch = tty->driver_data; 1363 tty_port_hangup(&ch->port); 1364 } 1365 1366 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd) 1367 { 1368 struct tty_struct *tty; 1369 unsigned long flags; 1370 dcd = !!dcd; 1371 1372 spin_lock_irqsave(&p->port.lock, flags); 1373 if (dcd != p->DCDState) { 1374 p->DCDState = dcd; 1375 spin_unlock_irqrestore(&p->port.lock, flags); 1376 tty = tty_port_tty_get(&p->port); 1377 if (tty && !C_CLOCAL(tty) && !dcd) 1378 tty_hangup(tty); 1379 tty_kref_put(tty); 1380 } 1381 else 1382 spin_unlock_irqrestore(&p->port.lock, flags); 1383 } 1384 1385 static int moxa_poll_port(struct moxa_port *p, unsigned int handle, 1386 u16 __iomem *ip) 1387 { 1388 struct tty_struct *tty = tty_port_tty_get(&p->port); 1389 void __iomem *ofsAddr; 1390 unsigned int inited = p->port.flags & ASYNC_INITIALIZED; 1391 u16 intr; 1392 1393 if (tty) { 1394 if (test_bit(EMPTYWAIT, &p->statusflags) && 1395 MoxaPortTxQueue(p) == 0) { 1396 clear_bit(EMPTYWAIT, &p->statusflags); 1397 tty_wakeup(tty); 1398 } 1399 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped && 1400 MoxaPortTxQueue(p) <= WAKEUP_CHARS) { 1401 clear_bit(LOWWAIT, &p->statusflags); 1402 tty_wakeup(tty); 1403 } 1404 1405 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) && 1406 MoxaPortRxQueue(p) > 0) { /* RX */ 1407 MoxaPortReadData(p); 1408 tty_schedule_flip(tty); 1409 } 1410 } else { 1411 clear_bit(EMPTYWAIT, &p->statusflags); 1412 MoxaPortFlushData(p, 0); /* flush RX */ 1413 } 1414 1415 if (!handle) /* nothing else to do */ 1416 goto put; 1417 1418 intr = readw(ip); /* port irq status */ 1419 if (intr == 0) 1420 goto put; 1421 1422 writew(0, ip); /* ACK port */ 1423 ofsAddr = p->tableAddr; 1424 if (intr & IntrTx) /* disable tx intr */ 1425 writew(readw(ofsAddr + HostStat) & ~WakeupTx, 1426 ofsAddr + HostStat); 1427 1428 if (!inited) 1429 goto put; 1430 1431 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */ 1432 tty_insert_flip_char(tty, 0, TTY_BREAK); 1433 tty_schedule_flip(tty); 1434 } 1435 1436 if (intr & IntrLine) 1437 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state); 1438 put: 1439 tty_kref_put(tty); 1440 1441 return 0; 1442 } 1443 1444 static void moxa_poll(unsigned long ignored) 1445 { 1446 struct moxa_board_conf *brd; 1447 u16 __iomem *ip; 1448 unsigned int card, port, served = 0; 1449 1450 spin_lock(&moxa_lock); 1451 for (card = 0; card < MAX_BOARDS; card++) { 1452 brd = &moxa_boards[card]; 1453 if (!brd->ready) 1454 continue; 1455 1456 served++; 1457 1458 ip = NULL; 1459 if (readb(brd->intPend) == 0xff) 1460 ip = brd->intTable + readb(brd->intNdx); 1461 1462 for (port = 0; port < brd->numPorts; port++) 1463 moxa_poll_port(&brd->ports[port], !!ip, ip + port); 1464 1465 if (ip) 1466 writeb(0, brd->intPend); /* ACK */ 1467 1468 if (moxaLowWaterChk) { 1469 struct moxa_port *p = brd->ports; 1470 for (port = 0; port < brd->numPorts; port++, p++) 1471 if (p->lowChkFlag) { 1472 p->lowChkFlag = 0; 1473 moxa_low_water_check(p->tableAddr); 1474 } 1475 } 1476 } 1477 moxaLowWaterChk = 0; 1478 1479 if (served) 1480 mod_timer(&moxaTimer, jiffies + HZ / 50); 1481 spin_unlock(&moxa_lock); 1482 } 1483 1484 /******************************************************************************/ 1485 1486 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios) 1487 { 1488 register struct ktermios *ts = &tty->termios; 1489 struct moxa_port *ch = tty->driver_data; 1490 int rts, cts, txflow, rxflow, xany, baud; 1491 1492 rts = cts = txflow = rxflow = xany = 0; 1493 if (ts->c_cflag & CRTSCTS) 1494 rts = cts = 1; 1495 if (ts->c_iflag & IXON) 1496 txflow = 1; 1497 if (ts->c_iflag & IXOFF) 1498 rxflow = 1; 1499 if (ts->c_iflag & IXANY) 1500 xany = 1; 1501 1502 /* Clear the features we don't support */ 1503 ts->c_cflag &= ~CMSPAR; 1504 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany); 1505 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty)); 1506 if (baud == -1) 1507 baud = tty_termios_baud_rate(old_termios); 1508 /* Not put the baud rate into the termios data */ 1509 tty_encode_baud_rate(tty, baud, baud); 1510 } 1511 1512 /***************************************************************************** 1513 * Driver level functions: * 1514 *****************************************************************************/ 1515 1516 static void MoxaPortFlushData(struct moxa_port *port, int mode) 1517 { 1518 void __iomem *ofsAddr; 1519 if (mode < 0 || mode > 2) 1520 return; 1521 ofsAddr = port->tableAddr; 1522 moxafunc(ofsAddr, FC_FlushQueue, mode); 1523 if (mode != 1) { 1524 port->lowChkFlag = 0; 1525 moxa_low_water_check(ofsAddr); 1526 } 1527 } 1528 1529 /* 1530 * Moxa Port Number Description: 1531 * 1532 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And, 1533 * the port number using in MOXA driver functions will be 0 to 31 for 1534 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96 1535 * to 127 for fourth. For example, if you setup three MOXA boards, 1536 * first board is C218, second board is C320-16 and third board is 1537 * C320-32. The port number of first board (C218 - 8 ports) is from 1538 * 0 to 7. The port number of second board (C320 - 16 ports) is form 1539 * 32 to 47. The port number of third board (C320 - 32 ports) is from 1540 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to 1541 * 127 will be invalid. 1542 * 1543 * 1544 * Moxa Functions Description: 1545 * 1546 * Function 1: Driver initialization routine, this routine must be 1547 * called when initialized driver. 1548 * Syntax: 1549 * void MoxaDriverInit(); 1550 * 1551 * 1552 * Function 2: Moxa driver private IOCTL command processing. 1553 * Syntax: 1554 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port); 1555 * 1556 * unsigned int cmd : IOCTL command 1557 * unsigned long arg : IOCTL argument 1558 * int port : port number (0 - 127) 1559 * 1560 * return: 0 (OK) 1561 * -EINVAL 1562 * -ENOIOCTLCMD 1563 * 1564 * 1565 * Function 6: Enable this port to start Tx/Rx data. 1566 * Syntax: 1567 * void MoxaPortEnable(int port); 1568 * int port : port number (0 - 127) 1569 * 1570 * 1571 * Function 7: Disable this port 1572 * Syntax: 1573 * void MoxaPortDisable(int port); 1574 * int port : port number (0 - 127) 1575 * 1576 * 1577 * Function 10: Setting baud rate of this port. 1578 * Syntax: 1579 * speed_t MoxaPortSetBaud(int port, speed_t baud); 1580 * int port : port number (0 - 127) 1581 * long baud : baud rate (50 - 115200) 1582 * 1583 * return: 0 : this port is invalid or baud < 50 1584 * 50 - 115200 : the real baud rate set to the port, if 1585 * the argument baud is large than maximun 1586 * available baud rate, the real setting 1587 * baud rate will be the maximun baud rate. 1588 * 1589 * 1590 * Function 12: Configure the port. 1591 * Syntax: 1592 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud); 1593 * int port : port number (0 - 127) 1594 * struct ktermios * termio : termio structure pointer 1595 * speed_t baud : baud rate 1596 * 1597 * return: -1 : this port is invalid or termio == NULL 1598 * 0 : setting O.K. 1599 * 1600 * 1601 * Function 13: Get the DTR/RTS state of this port. 1602 * Syntax: 1603 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState); 1604 * int port : port number (0 - 127) 1605 * int * dtrState : pointer to INT to receive the current DTR 1606 * state. (if NULL, this function will not 1607 * write to this address) 1608 * int * rtsState : pointer to INT to receive the current RTS 1609 * state. (if NULL, this function will not 1610 * write to this address) 1611 * 1612 * return: -1 : this port is invalid 1613 * 0 : O.K. 1614 * 1615 * 1616 * Function 14: Setting the DTR/RTS output state of this port. 1617 * Syntax: 1618 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState); 1619 * int port : port number (0 - 127) 1620 * int dtrState : DTR output state (0: off, 1: on) 1621 * int rtsState : RTS output state (0: off, 1: on) 1622 * 1623 * 1624 * Function 15: Setting the flow control of this port. 1625 * Syntax: 1626 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow, 1627 * int txFlow,int xany); 1628 * int port : port number (0 - 127) 1629 * int rtsFlow : H/W RTS flow control (0: no, 1: yes) 1630 * int ctsFlow : H/W CTS flow control (0: no, 1: yes) 1631 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes) 1632 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes) 1633 * int xany : S/W XANY flow control (0: no, 1: yes) 1634 * 1635 * 1636 * Function 16: Get ths line status of this port 1637 * Syntax: 1638 * int MoxaPortLineStatus(int port); 1639 * int port : port number (0 - 127) 1640 * 1641 * return: Bit 0 - CTS state (0: off, 1: on) 1642 * Bit 1 - DSR state (0: off, 1: on) 1643 * Bit 2 - DCD state (0: off, 1: on) 1644 * 1645 * 1646 * Function 19: Flush the Rx/Tx buffer data of this port. 1647 * Syntax: 1648 * void MoxaPortFlushData(int port, int mode); 1649 * int port : port number (0 - 127) 1650 * int mode 1651 * 0 : flush the Rx buffer 1652 * 1 : flush the Tx buffer 1653 * 2 : flush the Rx and Tx buffer 1654 * 1655 * 1656 * Function 20: Write data. 1657 * Syntax: 1658 * int MoxaPortWriteData(int port, unsigned char * buffer, int length); 1659 * int port : port number (0 - 127) 1660 * unsigned char * buffer : pointer to write data buffer. 1661 * int length : write data length 1662 * 1663 * return: 0 - length : real write data length 1664 * 1665 * 1666 * Function 21: Read data. 1667 * Syntax: 1668 * int MoxaPortReadData(int port, struct tty_struct *tty); 1669 * int port : port number (0 - 127) 1670 * struct tty_struct *tty : tty for data 1671 * 1672 * return: 0 - length : real read data length 1673 * 1674 * 1675 * Function 24: Get the Tx buffer current queued data bytes 1676 * Syntax: 1677 * int MoxaPortTxQueue(int port); 1678 * int port : port number (0 - 127) 1679 * 1680 * return: .. : Tx buffer current queued data bytes 1681 * 1682 * 1683 * Function 25: Get the Tx buffer current free space 1684 * Syntax: 1685 * int MoxaPortTxFree(int port); 1686 * int port : port number (0 - 127) 1687 * 1688 * return: .. : Tx buffer current free space 1689 * 1690 * 1691 * Function 26: Get the Rx buffer current queued data bytes 1692 * Syntax: 1693 * int MoxaPortRxQueue(int port); 1694 * int port : port number (0 - 127) 1695 * 1696 * return: .. : Rx buffer current queued data bytes 1697 * 1698 * 1699 * Function 28: Disable port data transmission. 1700 * Syntax: 1701 * void MoxaPortTxDisable(int port); 1702 * int port : port number (0 - 127) 1703 * 1704 * 1705 * Function 29: Enable port data transmission. 1706 * Syntax: 1707 * void MoxaPortTxEnable(int port); 1708 * int port : port number (0 - 127) 1709 * 1710 * 1711 * Function 31: Get the received BREAK signal count and reset it. 1712 * Syntax: 1713 * int MoxaPortResetBrkCnt(int port); 1714 * int port : port number (0 - 127) 1715 * 1716 * return: 0 - .. : BREAK signal count 1717 * 1718 * 1719 */ 1720 1721 static void MoxaPortEnable(struct moxa_port *port) 1722 { 1723 void __iomem *ofsAddr; 1724 u16 lowwater = 512; 1725 1726 ofsAddr = port->tableAddr; 1727 writew(lowwater, ofsAddr + Low_water); 1728 if (MOXA_IS_320(port->board)) 1729 moxafunc(ofsAddr, FC_SetBreakIrq, 0); 1730 else 1731 writew(readw(ofsAddr + HostStat) | WakeupBreak, 1732 ofsAddr + HostStat); 1733 1734 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code); 1735 moxafunc(ofsAddr, FC_FlushQueue, 2); 1736 1737 moxafunc(ofsAddr, FC_EnableCH, Magic_code); 1738 MoxaPortLineStatus(port); 1739 } 1740 1741 static void MoxaPortDisable(struct moxa_port *port) 1742 { 1743 void __iomem *ofsAddr = port->tableAddr; 1744 1745 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */ 1746 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code); 1747 writew(0, ofsAddr + HostStat); 1748 moxafunc(ofsAddr, FC_DisableCH, Magic_code); 1749 } 1750 1751 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud) 1752 { 1753 void __iomem *ofsAddr = port->tableAddr; 1754 unsigned int clock, val; 1755 speed_t max; 1756 1757 max = MOXA_IS_320(port->board) ? 460800 : 921600; 1758 if (baud < 50) 1759 return 0; 1760 if (baud > max) 1761 baud = max; 1762 clock = 921600; 1763 val = clock / baud; 1764 moxafunc(ofsAddr, FC_SetBaud, val); 1765 baud = clock / val; 1766 return baud; 1767 } 1768 1769 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio, 1770 speed_t baud) 1771 { 1772 void __iomem *ofsAddr; 1773 tcflag_t mode = 0; 1774 1775 ofsAddr = port->tableAddr; 1776 1777 mode = termio->c_cflag & CSIZE; 1778 if (mode == CS5) 1779 mode = MX_CS5; 1780 else if (mode == CS6) 1781 mode = MX_CS6; 1782 else if (mode == CS7) 1783 mode = MX_CS7; 1784 else if (mode == CS8) 1785 mode = MX_CS8; 1786 1787 if (termio->c_cflag & CSTOPB) { 1788 if (mode == MX_CS5) 1789 mode |= MX_STOP15; 1790 else 1791 mode |= MX_STOP2; 1792 } else 1793 mode |= MX_STOP1; 1794 1795 if (termio->c_cflag & PARENB) { 1796 if (termio->c_cflag & PARODD) 1797 mode |= MX_PARODD; 1798 else 1799 mode |= MX_PAREVEN; 1800 } else 1801 mode |= MX_PARNONE; 1802 1803 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode); 1804 1805 if (MOXA_IS_320(port->board) && baud >= 921600) 1806 return -1; 1807 1808 baud = MoxaPortSetBaud(port, baud); 1809 1810 if (termio->c_iflag & (IXON | IXOFF | IXANY)) { 1811 spin_lock_irq(&moxafunc_lock); 1812 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg); 1813 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1); 1814 writeb(FC_SetXonXoff, ofsAddr + FuncCode); 1815 moxa_wait_finish(ofsAddr); 1816 spin_unlock_irq(&moxafunc_lock); 1817 1818 } 1819 return baud; 1820 } 1821 1822 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState, 1823 int *rtsState) 1824 { 1825 if (dtrState) 1826 *dtrState = !!(port->lineCtrl & DTR_ON); 1827 if (rtsState) 1828 *rtsState = !!(port->lineCtrl & RTS_ON); 1829 1830 return 0; 1831 } 1832 1833 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts) 1834 { 1835 u8 mode = 0; 1836 1837 if (dtr) 1838 mode |= DTR_ON; 1839 if (rts) 1840 mode |= RTS_ON; 1841 port->lineCtrl = mode; 1842 moxafunc(port->tableAddr, FC_LineControl, mode); 1843 } 1844 1845 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts, 1846 int txflow, int rxflow, int txany) 1847 { 1848 int mode = 0; 1849 1850 if (rts) 1851 mode |= RTS_FlowCtl; 1852 if (cts) 1853 mode |= CTS_FlowCtl; 1854 if (txflow) 1855 mode |= Tx_FlowCtl; 1856 if (rxflow) 1857 mode |= Rx_FlowCtl; 1858 if (txany) 1859 mode |= IXM_IXANY; 1860 moxafunc(port->tableAddr, FC_SetFlowCtl, mode); 1861 } 1862 1863 static int MoxaPortLineStatus(struct moxa_port *port) 1864 { 1865 void __iomem *ofsAddr; 1866 int val; 1867 1868 ofsAddr = port->tableAddr; 1869 if (MOXA_IS_320(port->board)) 1870 val = moxafuncret(ofsAddr, FC_LineStatus, 0); 1871 else 1872 val = readw(ofsAddr + FlagStat) >> 4; 1873 val &= 0x0B; 1874 if (val & 8) 1875 val |= 4; 1876 moxa_new_dcdstate(port, val & 8); 1877 val &= 7; 1878 return val; 1879 } 1880 1881 static int MoxaPortWriteData(struct tty_struct *tty, 1882 const unsigned char *buffer, int len) 1883 { 1884 struct moxa_port *port = tty->driver_data; 1885 void __iomem *baseAddr, *ofsAddr, *ofs; 1886 unsigned int c, total; 1887 u16 head, tail, tx_mask, spage, epage; 1888 u16 pageno, pageofs, bufhead; 1889 1890 ofsAddr = port->tableAddr; 1891 baseAddr = port->board->basemem; 1892 tx_mask = readw(ofsAddr + TX_mask); 1893 spage = readw(ofsAddr + Page_txb); 1894 epage = readw(ofsAddr + EndPage_txb); 1895 tail = readw(ofsAddr + TXwptr); 1896 head = readw(ofsAddr + TXrptr); 1897 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask); 1898 if (c > len) 1899 c = len; 1900 moxaLog.txcnt[port->port.tty->index] += c; 1901 total = c; 1902 if (spage == epage) { 1903 bufhead = readw(ofsAddr + Ofs_txb); 1904 writew(spage, baseAddr + Control_reg); 1905 while (c > 0) { 1906 if (head > tail) 1907 len = head - tail - 1; 1908 else 1909 len = tx_mask + 1 - tail; 1910 len = (c > len) ? len : c; 1911 ofs = baseAddr + DynPage_addr + bufhead + tail; 1912 memcpy_toio(ofs, buffer, len); 1913 buffer += len; 1914 tail = (tail + len) & tx_mask; 1915 c -= len; 1916 } 1917 } else { 1918 pageno = spage + (tail >> 13); 1919 pageofs = tail & Page_mask; 1920 while (c > 0) { 1921 len = Page_size - pageofs; 1922 if (len > c) 1923 len = c; 1924 writeb(pageno, baseAddr + Control_reg); 1925 ofs = baseAddr + DynPage_addr + pageofs; 1926 memcpy_toio(ofs, buffer, len); 1927 buffer += len; 1928 if (++pageno == epage) 1929 pageno = spage; 1930 pageofs = 0; 1931 c -= len; 1932 } 1933 tail = (tail + total) & tx_mask; 1934 } 1935 writew(tail, ofsAddr + TXwptr); 1936 writeb(1, ofsAddr + CD180TXirq); /* start to send */ 1937 return total; 1938 } 1939 1940 static int MoxaPortReadData(struct moxa_port *port) 1941 { 1942 struct tty_struct *tty = port->port.tty; 1943 unsigned char *dst; 1944 void __iomem *baseAddr, *ofsAddr, *ofs; 1945 unsigned int count, len, total; 1946 u16 tail, rx_mask, spage, epage; 1947 u16 pageno, pageofs, bufhead, head; 1948 1949 ofsAddr = port->tableAddr; 1950 baseAddr = port->board->basemem; 1951 head = readw(ofsAddr + RXrptr); 1952 tail = readw(ofsAddr + RXwptr); 1953 rx_mask = readw(ofsAddr + RX_mask); 1954 spage = readw(ofsAddr + Page_rxb); 1955 epage = readw(ofsAddr + EndPage_rxb); 1956 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1); 1957 if (count == 0) 1958 return 0; 1959 1960 total = count; 1961 moxaLog.rxcnt[tty->index] += total; 1962 if (spage == epage) { 1963 bufhead = readw(ofsAddr + Ofs_rxb); 1964 writew(spage, baseAddr + Control_reg); 1965 while (count > 0) { 1966 ofs = baseAddr + DynPage_addr + bufhead + head; 1967 len = (tail >= head) ? (tail - head) : 1968 (rx_mask + 1 - head); 1969 len = tty_prepare_flip_string(tty, &dst, 1970 min(len, count)); 1971 memcpy_fromio(dst, ofs, len); 1972 head = (head + len) & rx_mask; 1973 count -= len; 1974 } 1975 } else { 1976 pageno = spage + (head >> 13); 1977 pageofs = head & Page_mask; 1978 while (count > 0) { 1979 writew(pageno, baseAddr + Control_reg); 1980 ofs = baseAddr + DynPage_addr + pageofs; 1981 len = tty_prepare_flip_string(tty, &dst, 1982 min(Page_size - pageofs, count)); 1983 memcpy_fromio(dst, ofs, len); 1984 1985 count -= len; 1986 pageofs = (pageofs + len) & Page_mask; 1987 if (pageofs == 0 && ++pageno == epage) 1988 pageno = spage; 1989 } 1990 head = (head + total) & rx_mask; 1991 } 1992 writew(head, ofsAddr + RXrptr); 1993 if (readb(ofsAddr + FlagStat) & Xoff_state) { 1994 moxaLowWaterChk = 1; 1995 port->lowChkFlag = 1; 1996 } 1997 return total; 1998 } 1999 2000 2001 static int MoxaPortTxQueue(struct moxa_port *port) 2002 { 2003 void __iomem *ofsAddr = port->tableAddr; 2004 u16 rptr, wptr, mask; 2005 2006 rptr = readw(ofsAddr + TXrptr); 2007 wptr = readw(ofsAddr + TXwptr); 2008 mask = readw(ofsAddr + TX_mask); 2009 return (wptr - rptr) & mask; 2010 } 2011 2012 static int MoxaPortTxFree(struct moxa_port *port) 2013 { 2014 void __iomem *ofsAddr = port->tableAddr; 2015 u16 rptr, wptr, mask; 2016 2017 rptr = readw(ofsAddr + TXrptr); 2018 wptr = readw(ofsAddr + TXwptr); 2019 mask = readw(ofsAddr + TX_mask); 2020 return mask - ((wptr - rptr) & mask); 2021 } 2022 2023 static int MoxaPortRxQueue(struct moxa_port *port) 2024 { 2025 void __iomem *ofsAddr = port->tableAddr; 2026 u16 rptr, wptr, mask; 2027 2028 rptr = readw(ofsAddr + RXrptr); 2029 wptr = readw(ofsAddr + RXwptr); 2030 mask = readw(ofsAddr + RX_mask); 2031 return (wptr - rptr) & mask; 2032 } 2033 2034 static void MoxaPortTxDisable(struct moxa_port *port) 2035 { 2036 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code); 2037 } 2038 2039 static void MoxaPortTxEnable(struct moxa_port *port) 2040 { 2041 moxafunc(port->tableAddr, FC_SetXonState, Magic_code); 2042 } 2043 2044 static int moxa_get_serial_info(struct moxa_port *info, 2045 struct serial_struct __user *retinfo) 2046 { 2047 struct serial_struct tmp = { 2048 .type = info->type, 2049 .line = info->port.tty->index, 2050 .flags = info->port.flags, 2051 .baud_base = 921600, 2052 .close_delay = info->port.close_delay 2053 }; 2054 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; 2055 } 2056 2057 2058 static int moxa_set_serial_info(struct moxa_port *info, 2059 struct serial_struct __user *new_info) 2060 { 2061 struct serial_struct new_serial; 2062 2063 if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) 2064 return -EFAULT; 2065 2066 if (new_serial.irq != 0 || new_serial.port != 0 || 2067 new_serial.custom_divisor != 0 || 2068 new_serial.baud_base != 921600) 2069 return -EPERM; 2070 2071 if (!capable(CAP_SYS_ADMIN)) { 2072 if (((new_serial.flags & ~ASYNC_USR_MASK) != 2073 (info->port.flags & ~ASYNC_USR_MASK))) 2074 return -EPERM; 2075 } else 2076 info->port.close_delay = new_serial.close_delay * HZ / 100; 2077 2078 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS); 2079 new_serial.flags |= (info->port.flags & ASYNC_FLAGS); 2080 2081 MoxaSetFifo(info, new_serial.type == PORT_16550A); 2082 2083 info->type = new_serial.type; 2084 return 0; 2085 } 2086 2087 2088 2089 /***************************************************************************** 2090 * Static local functions: * 2091 *****************************************************************************/ 2092 2093 static void MoxaSetFifo(struct moxa_port *port, int enable) 2094 { 2095 void __iomem *ofsAddr = port->tableAddr; 2096 2097 if (!enable) { 2098 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0); 2099 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1); 2100 } else { 2101 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3); 2102 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16); 2103 } 2104 } 2105