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