1 /* 2 * Serial driver for the amiga builtin port. 3 * 4 * This code was created by taking serial.c version 4.30 from kernel 5 * release 2.3.22, replacing all hardware related stuff with the 6 * corresponding amiga hardware actions, and removing all irrelevant 7 * code. As a consequence, it uses many of the constants and names 8 * associated with the registers and bits of 16550 compatible UARTS - 9 * but only to keep track of status, etc in the state variables. It 10 * was done this was to make it easier to keep the code in line with 11 * (non hardware specific) changes to serial.c. 12 * 13 * The port is registered with the tty driver as minor device 64, and 14 * therefore other ports should should only use 65 upwards. 15 * 16 * Richard Lucock 28/12/99 17 * 18 * Copyright (C) 1991, 1992 Linus Torvalds 19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 20 * 1998, 1999 Theodore Ts'o 21 * 22 */ 23 24 /* 25 * Serial driver configuration section. Here are the various options: 26 * 27 * SERIAL_PARANOIA_CHECK 28 * Check the magic number for the async_structure where 29 * ever possible. 30 */ 31 32 #include <linux/delay.h> 33 34 #undef SERIAL_PARANOIA_CHECK 35 36 /* Set of debugging defines */ 37 38 #undef SERIAL_DEBUG_INTR 39 #undef SERIAL_DEBUG_OPEN 40 #undef SERIAL_DEBUG_FLOW 41 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 42 43 /* Sanity checks */ 44 45 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) 46 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ 47 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) 48 #else 49 #define DBG_CNT(s) 50 #endif 51 52 /* 53 * End of serial driver configuration section. 54 */ 55 56 #include <linux/module.h> 57 58 #include <linux/types.h> 59 #include <linux/serial.h> 60 #include <linux/serial_reg.h> 61 static char *serial_version = "4.30"; 62 63 #include <linux/errno.h> 64 #include <linux/signal.h> 65 #include <linux/sched.h> 66 #include <linux/kernel.h> 67 #include <linux/timer.h> 68 #include <linux/interrupt.h> 69 #include <linux/tty.h> 70 #include <linux/tty_flip.h> 71 #include <linux/circ_buf.h> 72 #include <linux/console.h> 73 #include <linux/major.h> 74 #include <linux/string.h> 75 #include <linux/fcntl.h> 76 #include <linux/ptrace.h> 77 #include <linux/ioport.h> 78 #include <linux/mm.h> 79 #include <linux/seq_file.h> 80 #include <linux/slab.h> 81 #include <linux/init.h> 82 #include <linux/bitops.h> 83 #include <linux/platform_device.h> 84 85 #include <asm/setup.h> 86 87 88 #include <asm/irq.h> 89 90 #include <asm/amigahw.h> 91 #include <asm/amigaints.h> 92 93 struct serial_state { 94 struct tty_port tport; 95 struct circ_buf xmit; 96 struct async_icount icount; 97 98 unsigned long port; 99 int baud_base; 100 int xmit_fifo_size; 101 int custom_divisor; 102 int read_status_mask; 103 int ignore_status_mask; 104 int timeout; 105 int quot; 106 int IER; /* Interrupt Enable Register */ 107 int MCR; /* Modem control register */ 108 int x_char; /* xon/xoff character */ 109 }; 110 111 #define custom amiga_custom 112 static char *serial_name = "Amiga-builtin serial driver"; 113 114 static struct tty_driver *serial_driver; 115 116 /* number of characters left in xmit buffer before we ask for more */ 117 #define WAKEUP_CHARS 256 118 119 static unsigned char current_ctl_bits; 120 121 static void change_speed(struct tty_struct *tty, struct serial_state *info, 122 struct ktermios *old); 123 static void rs_wait_until_sent(struct tty_struct *tty, int timeout); 124 125 126 static struct serial_state rs_table[1]; 127 128 #define NR_PORTS ARRAY_SIZE(rs_table) 129 130 #include <asm/uaccess.h> 131 132 #define serial_isroot() (capable(CAP_SYS_ADMIN)) 133 134 135 static inline int serial_paranoia_check(struct serial_state *info, 136 char *name, const char *routine) 137 { 138 #ifdef SERIAL_PARANOIA_CHECK 139 static const char *badmagic = 140 "Warning: bad magic number for serial struct (%s) in %s\n"; 141 static const char *badinfo = 142 "Warning: null async_struct for (%s) in %s\n"; 143 144 if (!info) { 145 printk(badinfo, name, routine); 146 return 1; 147 } 148 if (info->magic != SERIAL_MAGIC) { 149 printk(badmagic, name, routine); 150 return 1; 151 } 152 #endif 153 return 0; 154 } 155 156 /* some serial hardware definitions */ 157 #define SDR_OVRUN (1<<15) 158 #define SDR_RBF (1<<14) 159 #define SDR_TBE (1<<13) 160 #define SDR_TSRE (1<<12) 161 162 #define SERPER_PARENB (1<<15) 163 164 #define AC_SETCLR (1<<15) 165 #define AC_UARTBRK (1<<11) 166 167 #define SER_DTR (1<<7) 168 #define SER_RTS (1<<6) 169 #define SER_DCD (1<<5) 170 #define SER_CTS (1<<4) 171 #define SER_DSR (1<<3) 172 173 static __inline__ void rtsdtr_ctrl(int bits) 174 { 175 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); 176 } 177 178 /* 179 * ------------------------------------------------------------ 180 * rs_stop() and rs_start() 181 * 182 * This routines are called before setting or resetting tty->stopped. 183 * They enable or disable transmitter interrupts, as necessary. 184 * ------------------------------------------------------------ 185 */ 186 static void rs_stop(struct tty_struct *tty) 187 { 188 struct serial_state *info = tty->driver_data; 189 unsigned long flags; 190 191 if (serial_paranoia_check(info, tty->name, "rs_stop")) 192 return; 193 194 local_irq_save(flags); 195 if (info->IER & UART_IER_THRI) { 196 info->IER &= ~UART_IER_THRI; 197 /* disable Tx interrupt and remove any pending interrupts */ 198 custom.intena = IF_TBE; 199 mb(); 200 custom.intreq = IF_TBE; 201 mb(); 202 } 203 local_irq_restore(flags); 204 } 205 206 static void rs_start(struct tty_struct *tty) 207 { 208 struct serial_state *info = tty->driver_data; 209 unsigned long flags; 210 211 if (serial_paranoia_check(info, tty->name, "rs_start")) 212 return; 213 214 local_irq_save(flags); 215 if (info->xmit.head != info->xmit.tail 216 && info->xmit.buf 217 && !(info->IER & UART_IER_THRI)) { 218 info->IER |= UART_IER_THRI; 219 custom.intena = IF_SETCLR | IF_TBE; 220 mb(); 221 /* set a pending Tx Interrupt, transmitter should restart now */ 222 custom.intreq = IF_SETCLR | IF_TBE; 223 mb(); 224 } 225 local_irq_restore(flags); 226 } 227 228 /* 229 * ---------------------------------------------------------------------- 230 * 231 * Here starts the interrupt handling routines. All of the following 232 * subroutines are declared as inline and are folded into 233 * rs_interrupt(). They were separated out for readability's sake. 234 * 235 * Note: rs_interrupt() is a "fast" interrupt, which means that it 236 * runs with interrupts turned off. People who may want to modify 237 * rs_interrupt() should try to keep the interrupt handler as fast as 238 * possible. After you are done making modifications, it is not a bad 239 * idea to do: 240 * 241 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c 242 * 243 * and look at the resulting assemble code in serial.s. 244 * 245 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 246 * ----------------------------------------------------------------------- 247 */ 248 249 static void receive_chars(struct serial_state *info) 250 { 251 int status; 252 int serdatr; 253 unsigned char ch, flag; 254 struct async_icount *icount; 255 int oe = 0; 256 257 icount = &info->icount; 258 259 status = UART_LSR_DR; /* We obviously have a character! */ 260 serdatr = custom.serdatr; 261 mb(); 262 custom.intreq = IF_RBF; 263 mb(); 264 265 if((serdatr & 0x1ff) == 0) 266 status |= UART_LSR_BI; 267 if(serdatr & SDR_OVRUN) 268 status |= UART_LSR_OE; 269 270 ch = serdatr & 0xff; 271 icount->rx++; 272 273 #ifdef SERIAL_DEBUG_INTR 274 printk("DR%02x:%02x...", ch, status); 275 #endif 276 flag = TTY_NORMAL; 277 278 /* 279 * We don't handle parity or frame errors - but I have left 280 * the code in, since I'm not sure that the errors can't be 281 * detected. 282 */ 283 284 if (status & (UART_LSR_BI | UART_LSR_PE | 285 UART_LSR_FE | UART_LSR_OE)) { 286 /* 287 * For statistics only 288 */ 289 if (status & UART_LSR_BI) { 290 status &= ~(UART_LSR_FE | UART_LSR_PE); 291 icount->brk++; 292 } else if (status & UART_LSR_PE) 293 icount->parity++; 294 else if (status & UART_LSR_FE) 295 icount->frame++; 296 if (status & UART_LSR_OE) 297 icount->overrun++; 298 299 /* 300 * Now check to see if character should be 301 * ignored, and mask off conditions which 302 * should be ignored. 303 */ 304 if (status & info->ignore_status_mask) 305 goto out; 306 307 status &= info->read_status_mask; 308 309 if (status & (UART_LSR_BI)) { 310 #ifdef SERIAL_DEBUG_INTR 311 printk("handling break...."); 312 #endif 313 flag = TTY_BREAK; 314 if (info->tport.flags & ASYNC_SAK) 315 do_SAK(info->tport.tty); 316 } else if (status & UART_LSR_PE) 317 flag = TTY_PARITY; 318 else if (status & UART_LSR_FE) 319 flag = TTY_FRAME; 320 if (status & UART_LSR_OE) { 321 /* 322 * Overrun is special, since it's 323 * reported immediately, and doesn't 324 * affect the current character 325 */ 326 oe = 1; 327 } 328 } 329 tty_insert_flip_char(&info->tport, ch, flag); 330 if (oe == 1) 331 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); 332 tty_flip_buffer_push(&info->tport); 333 out: 334 return; 335 } 336 337 static void transmit_chars(struct serial_state *info) 338 { 339 custom.intreq = IF_TBE; 340 mb(); 341 if (info->x_char) { 342 custom.serdat = info->x_char | 0x100; 343 mb(); 344 info->icount.tx++; 345 info->x_char = 0; 346 return; 347 } 348 if (info->xmit.head == info->xmit.tail 349 || info->tport.tty->stopped 350 || info->tport.tty->hw_stopped) { 351 info->IER &= ~UART_IER_THRI; 352 custom.intena = IF_TBE; 353 mb(); 354 return; 355 } 356 357 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; 358 mb(); 359 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); 360 info->icount.tx++; 361 362 if (CIRC_CNT(info->xmit.head, 363 info->xmit.tail, 364 SERIAL_XMIT_SIZE) < WAKEUP_CHARS) 365 tty_wakeup(info->tport.tty); 366 367 #ifdef SERIAL_DEBUG_INTR 368 printk("THRE..."); 369 #endif 370 if (info->xmit.head == info->xmit.tail) { 371 custom.intena = IF_TBE; 372 mb(); 373 info->IER &= ~UART_IER_THRI; 374 } 375 } 376 377 static void check_modem_status(struct serial_state *info) 378 { 379 struct tty_port *port = &info->tport; 380 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 381 unsigned char dstatus; 382 struct async_icount *icount; 383 384 /* Determine bits that have changed */ 385 dstatus = status ^ current_ctl_bits; 386 current_ctl_bits = status; 387 388 if (dstatus) { 389 icount = &info->icount; 390 /* update input line counters */ 391 if (dstatus & SER_DSR) 392 icount->dsr++; 393 if (dstatus & SER_DCD) { 394 icount->dcd++; 395 } 396 if (dstatus & SER_CTS) 397 icount->cts++; 398 wake_up_interruptible(&port->delta_msr_wait); 399 } 400 401 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { 402 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) 403 printk("ttyS%d CD now %s...", info->line, 404 (!(status & SER_DCD)) ? "on" : "off"); 405 #endif 406 if (!(status & SER_DCD)) 407 wake_up_interruptible(&port->open_wait); 408 else { 409 #ifdef SERIAL_DEBUG_OPEN 410 printk("doing serial hangup..."); 411 #endif 412 if (port->tty) 413 tty_hangup(port->tty); 414 } 415 } 416 if (tty_port_cts_enabled(port)) { 417 if (port->tty->hw_stopped) { 418 if (!(status & SER_CTS)) { 419 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 420 printk("CTS tx start..."); 421 #endif 422 port->tty->hw_stopped = 0; 423 info->IER |= UART_IER_THRI; 424 custom.intena = IF_SETCLR | IF_TBE; 425 mb(); 426 /* set a pending Tx Interrupt, transmitter should restart now */ 427 custom.intreq = IF_SETCLR | IF_TBE; 428 mb(); 429 tty_wakeup(port->tty); 430 return; 431 } 432 } else { 433 if ((status & SER_CTS)) { 434 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 435 printk("CTS tx stop..."); 436 #endif 437 port->tty->hw_stopped = 1; 438 info->IER &= ~UART_IER_THRI; 439 /* disable Tx interrupt and remove any pending interrupts */ 440 custom.intena = IF_TBE; 441 mb(); 442 custom.intreq = IF_TBE; 443 mb(); 444 } 445 } 446 } 447 } 448 449 static irqreturn_t ser_vbl_int( int irq, void *data) 450 { 451 /* vbl is just a periodic interrupt we tie into to update modem status */ 452 struct serial_state *info = data; 453 /* 454 * TBD - is it better to unregister from this interrupt or to 455 * ignore it if MSI is clear ? 456 */ 457 if(info->IER & UART_IER_MSI) 458 check_modem_status(info); 459 return IRQ_HANDLED; 460 } 461 462 static irqreturn_t ser_rx_int(int irq, void *dev_id) 463 { 464 struct serial_state *info = dev_id; 465 466 #ifdef SERIAL_DEBUG_INTR 467 printk("ser_rx_int..."); 468 #endif 469 470 if (!info->tport.tty) 471 return IRQ_NONE; 472 473 receive_chars(info); 474 #ifdef SERIAL_DEBUG_INTR 475 printk("end.\n"); 476 #endif 477 return IRQ_HANDLED; 478 } 479 480 static irqreturn_t ser_tx_int(int irq, void *dev_id) 481 { 482 struct serial_state *info = dev_id; 483 484 if (custom.serdatr & SDR_TBE) { 485 #ifdef SERIAL_DEBUG_INTR 486 printk("ser_tx_int..."); 487 #endif 488 489 if (!info->tport.tty) 490 return IRQ_NONE; 491 492 transmit_chars(info); 493 #ifdef SERIAL_DEBUG_INTR 494 printk("end.\n"); 495 #endif 496 } 497 return IRQ_HANDLED; 498 } 499 500 /* 501 * ------------------------------------------------------------------- 502 * Here ends the serial interrupt routines. 503 * ------------------------------------------------------------------- 504 */ 505 506 /* 507 * --------------------------------------------------------------- 508 * Low level utility subroutines for the serial driver: routines to 509 * figure out the appropriate timeout for an interrupt chain, routines 510 * to initialize and startup a serial port, and routines to shutdown a 511 * serial port. Useful stuff like that. 512 * --------------------------------------------------------------- 513 */ 514 515 static int startup(struct tty_struct *tty, struct serial_state *info) 516 { 517 struct tty_port *port = &info->tport; 518 unsigned long flags; 519 int retval=0; 520 unsigned long page; 521 522 page = get_zeroed_page(GFP_KERNEL); 523 if (!page) 524 return -ENOMEM; 525 526 local_irq_save(flags); 527 528 if (port->flags & ASYNC_INITIALIZED) { 529 free_page(page); 530 goto errout; 531 } 532 533 if (info->xmit.buf) 534 free_page(page); 535 else 536 info->xmit.buf = (unsigned char *) page; 537 538 #ifdef SERIAL_DEBUG_OPEN 539 printk("starting up ttys%d ...", info->line); 540 #endif 541 542 /* Clear anything in the input buffer */ 543 544 custom.intreq = IF_RBF; 545 mb(); 546 547 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); 548 if (retval) { 549 if (serial_isroot()) { 550 set_bit(TTY_IO_ERROR, &tty->flags); 551 retval = 0; 552 } 553 goto errout; 554 } 555 556 /* enable both Rx and Tx interrupts */ 557 custom.intena = IF_SETCLR | IF_RBF | IF_TBE; 558 mb(); 559 info->IER = UART_IER_MSI; 560 561 /* remember current state of the DCD and CTS bits */ 562 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 563 564 info->MCR = 0; 565 if (C_BAUD(tty)) 566 info->MCR = SER_DTR | SER_RTS; 567 rtsdtr_ctrl(info->MCR); 568 569 clear_bit(TTY_IO_ERROR, &tty->flags); 570 info->xmit.head = info->xmit.tail = 0; 571 572 /* 573 * Set up the tty->alt_speed kludge 574 */ 575 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 576 tty->alt_speed = 57600; 577 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 578 tty->alt_speed = 115200; 579 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 580 tty->alt_speed = 230400; 581 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 582 tty->alt_speed = 460800; 583 584 /* 585 * and set the speed of the serial port 586 */ 587 change_speed(tty, info, NULL); 588 589 port->flags |= ASYNC_INITIALIZED; 590 local_irq_restore(flags); 591 return 0; 592 593 errout: 594 local_irq_restore(flags); 595 return retval; 596 } 597 598 /* 599 * This routine will shutdown a serial port; interrupts are disabled, and 600 * DTR is dropped if the hangup on close termio flag is on. 601 */ 602 static void shutdown(struct tty_struct *tty, struct serial_state *info) 603 { 604 unsigned long flags; 605 struct serial_state *state; 606 607 if (!(info->tport.flags & ASYNC_INITIALIZED)) 608 return; 609 610 state = info; 611 612 #ifdef SERIAL_DEBUG_OPEN 613 printk("Shutting down serial port %d ....\n", info->line); 614 #endif 615 616 local_irq_save(flags); /* Disable interrupts */ 617 618 /* 619 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 620 * here so the queue might never be waken up 621 */ 622 wake_up_interruptible(&info->tport.delta_msr_wait); 623 624 /* 625 * Free the IRQ, if necessary 626 */ 627 free_irq(IRQ_AMIGA_VERTB, info); 628 629 if (info->xmit.buf) { 630 free_page((unsigned long) info->xmit.buf); 631 info->xmit.buf = NULL; 632 } 633 634 info->IER = 0; 635 custom.intena = IF_RBF | IF_TBE; 636 mb(); 637 638 /* disable break condition */ 639 custom.adkcon = AC_UARTBRK; 640 mb(); 641 642 if (C_HUPCL(tty)) 643 info->MCR &= ~(SER_DTR|SER_RTS); 644 rtsdtr_ctrl(info->MCR); 645 646 set_bit(TTY_IO_ERROR, &tty->flags); 647 648 info->tport.flags &= ~ASYNC_INITIALIZED; 649 local_irq_restore(flags); 650 } 651 652 653 /* 654 * This routine is called to set the UART divisor registers to match 655 * the specified baud rate for a serial port. 656 */ 657 static void change_speed(struct tty_struct *tty, struct serial_state *info, 658 struct ktermios *old_termios) 659 { 660 struct tty_port *port = &info->tport; 661 int quot = 0, baud_base, baud; 662 unsigned cflag, cval = 0; 663 int bits; 664 unsigned long flags; 665 666 cflag = tty->termios.c_cflag; 667 668 /* Byte size is always 8 bits plus parity bit if requested */ 669 670 cval = 3; bits = 10; 671 if (cflag & CSTOPB) { 672 cval |= 0x04; 673 bits++; 674 } 675 if (cflag & PARENB) { 676 cval |= UART_LCR_PARITY; 677 bits++; 678 } 679 if (!(cflag & PARODD)) 680 cval |= UART_LCR_EPAR; 681 #ifdef CMSPAR 682 if (cflag & CMSPAR) 683 cval |= UART_LCR_SPAR; 684 #endif 685 686 /* Determine divisor based on baud rate */ 687 baud = tty_get_baud_rate(tty); 688 if (!baud) 689 baud = 9600; /* B0 transition handled in rs_set_termios */ 690 baud_base = info->baud_base; 691 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 692 quot = info->custom_divisor; 693 else { 694 if (baud == 134) 695 /* Special case since 134 is really 134.5 */ 696 quot = (2*baud_base / 269); 697 else if (baud) 698 quot = baud_base / baud; 699 } 700 /* If the quotient is zero refuse the change */ 701 if (!quot && old_termios) { 702 /* FIXME: Will need updating for new tty in the end */ 703 tty->termios.c_cflag &= ~CBAUD; 704 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 705 baud = tty_get_baud_rate(tty); 706 if (!baud) 707 baud = 9600; 708 if (baud == 38400 && 709 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 710 quot = info->custom_divisor; 711 else { 712 if (baud == 134) 713 /* Special case since 134 is really 134.5 */ 714 quot = (2*baud_base / 269); 715 else if (baud) 716 quot = baud_base / baud; 717 } 718 } 719 /* As a last resort, if the quotient is zero, default to 9600 bps */ 720 if (!quot) 721 quot = baud_base / 9600; 722 info->quot = quot; 723 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); 724 info->timeout += HZ/50; /* Add .02 seconds of slop */ 725 726 /* CTS flow control flag and modem status interrupts */ 727 info->IER &= ~UART_IER_MSI; 728 if (port->flags & ASYNC_HARDPPS_CD) 729 info->IER |= UART_IER_MSI; 730 tty_port_set_cts_flow(port, cflag & CRTSCTS); 731 if (cflag & CRTSCTS) 732 info->IER |= UART_IER_MSI; 733 if (cflag & CLOCAL) 734 port->flags &= ~ASYNC_CHECK_CD; 735 else { 736 port->flags |= ASYNC_CHECK_CD; 737 info->IER |= UART_IER_MSI; 738 } 739 /* TBD: 740 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 741 */ 742 743 /* 744 * Set up parity check flag 745 */ 746 747 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 748 if (I_INPCK(tty)) 749 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 750 if (I_BRKINT(tty) || I_PARMRK(tty)) 751 info->read_status_mask |= UART_LSR_BI; 752 753 /* 754 * Characters to ignore 755 */ 756 info->ignore_status_mask = 0; 757 if (I_IGNPAR(tty)) 758 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 759 if (I_IGNBRK(tty)) { 760 info->ignore_status_mask |= UART_LSR_BI; 761 /* 762 * If we're ignore parity and break indicators, ignore 763 * overruns too. (For real raw support). 764 */ 765 if (I_IGNPAR(tty)) 766 info->ignore_status_mask |= UART_LSR_OE; 767 } 768 /* 769 * !!! ignore all characters if CREAD is not set 770 */ 771 if ((cflag & CREAD) == 0) 772 info->ignore_status_mask |= UART_LSR_DR; 773 local_irq_save(flags); 774 775 { 776 short serper; 777 778 /* Set up the baud rate */ 779 serper = quot - 1; 780 781 /* Enable or disable parity bit */ 782 783 if(cval & UART_LCR_PARITY) 784 serper |= (SERPER_PARENB); 785 786 custom.serper = serper; 787 mb(); 788 } 789 790 local_irq_restore(flags); 791 } 792 793 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 794 { 795 struct serial_state *info; 796 unsigned long flags; 797 798 info = tty->driver_data; 799 800 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 801 return 0; 802 803 if (!info->xmit.buf) 804 return 0; 805 806 local_irq_save(flags); 807 if (CIRC_SPACE(info->xmit.head, 808 info->xmit.tail, 809 SERIAL_XMIT_SIZE) == 0) { 810 local_irq_restore(flags); 811 return 0; 812 } 813 814 info->xmit.buf[info->xmit.head++] = ch; 815 info->xmit.head &= SERIAL_XMIT_SIZE-1; 816 local_irq_restore(flags); 817 return 1; 818 } 819 820 static void rs_flush_chars(struct tty_struct *tty) 821 { 822 struct serial_state *info = tty->driver_data; 823 unsigned long flags; 824 825 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 826 return; 827 828 if (info->xmit.head == info->xmit.tail 829 || tty->stopped 830 || tty->hw_stopped 831 || !info->xmit.buf) 832 return; 833 834 local_irq_save(flags); 835 info->IER |= UART_IER_THRI; 836 custom.intena = IF_SETCLR | IF_TBE; 837 mb(); 838 /* set a pending Tx Interrupt, transmitter should restart now */ 839 custom.intreq = IF_SETCLR | IF_TBE; 840 mb(); 841 local_irq_restore(flags); 842 } 843 844 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 845 { 846 int c, ret = 0; 847 struct serial_state *info = tty->driver_data; 848 unsigned long flags; 849 850 if (serial_paranoia_check(info, tty->name, "rs_write")) 851 return 0; 852 853 if (!info->xmit.buf) 854 return 0; 855 856 local_irq_save(flags); 857 while (1) { 858 c = CIRC_SPACE_TO_END(info->xmit.head, 859 info->xmit.tail, 860 SERIAL_XMIT_SIZE); 861 if (count < c) 862 c = count; 863 if (c <= 0) { 864 break; 865 } 866 memcpy(info->xmit.buf + info->xmit.head, buf, c); 867 info->xmit.head = ((info->xmit.head + c) & 868 (SERIAL_XMIT_SIZE-1)); 869 buf += c; 870 count -= c; 871 ret += c; 872 } 873 local_irq_restore(flags); 874 875 if (info->xmit.head != info->xmit.tail 876 && !tty->stopped 877 && !tty->hw_stopped 878 && !(info->IER & UART_IER_THRI)) { 879 info->IER |= UART_IER_THRI; 880 local_irq_disable(); 881 custom.intena = IF_SETCLR | IF_TBE; 882 mb(); 883 /* set a pending Tx Interrupt, transmitter should restart now */ 884 custom.intreq = IF_SETCLR | IF_TBE; 885 mb(); 886 local_irq_restore(flags); 887 } 888 return ret; 889 } 890 891 static int rs_write_room(struct tty_struct *tty) 892 { 893 struct serial_state *info = tty->driver_data; 894 895 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 896 return 0; 897 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 898 } 899 900 static int rs_chars_in_buffer(struct tty_struct *tty) 901 { 902 struct serial_state *info = tty->driver_data; 903 904 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 905 return 0; 906 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 907 } 908 909 static void rs_flush_buffer(struct tty_struct *tty) 910 { 911 struct serial_state *info = tty->driver_data; 912 unsigned long flags; 913 914 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 915 return; 916 local_irq_save(flags); 917 info->xmit.head = info->xmit.tail = 0; 918 local_irq_restore(flags); 919 tty_wakeup(tty); 920 } 921 922 /* 923 * This function is used to send a high-priority XON/XOFF character to 924 * the device 925 */ 926 static void rs_send_xchar(struct tty_struct *tty, char ch) 927 { 928 struct serial_state *info = tty->driver_data; 929 unsigned long flags; 930 931 if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) 932 return; 933 934 info->x_char = ch; 935 if (ch) { 936 /* Make sure transmit interrupts are on */ 937 938 /* Check this ! */ 939 local_irq_save(flags); 940 if(!(custom.intenar & IF_TBE)) { 941 custom.intena = IF_SETCLR | IF_TBE; 942 mb(); 943 /* set a pending Tx Interrupt, transmitter should restart now */ 944 custom.intreq = IF_SETCLR | IF_TBE; 945 mb(); 946 } 947 local_irq_restore(flags); 948 949 info->IER |= UART_IER_THRI; 950 } 951 } 952 953 /* 954 * ------------------------------------------------------------ 955 * rs_throttle() 956 * 957 * This routine is called by the upper-layer tty layer to signal that 958 * incoming characters should be throttled. 959 * ------------------------------------------------------------ 960 */ 961 static void rs_throttle(struct tty_struct * tty) 962 { 963 struct serial_state *info = tty->driver_data; 964 unsigned long flags; 965 #ifdef SERIAL_DEBUG_THROTTLE 966 printk("throttle %s ....\n", tty_name(tty)); 967 #endif 968 969 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 970 return; 971 972 if (I_IXOFF(tty)) 973 rs_send_xchar(tty, STOP_CHAR(tty)); 974 975 if (C_CRTSCTS(tty)) 976 info->MCR &= ~SER_RTS; 977 978 local_irq_save(flags); 979 rtsdtr_ctrl(info->MCR); 980 local_irq_restore(flags); 981 } 982 983 static void rs_unthrottle(struct tty_struct * tty) 984 { 985 struct serial_state *info = tty->driver_data; 986 unsigned long flags; 987 #ifdef SERIAL_DEBUG_THROTTLE 988 printk("unthrottle %s ....\n", tty_name(tty)); 989 #endif 990 991 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 992 return; 993 994 if (I_IXOFF(tty)) { 995 if (info->x_char) 996 info->x_char = 0; 997 else 998 rs_send_xchar(tty, START_CHAR(tty)); 999 } 1000 if (C_CRTSCTS(tty)) 1001 info->MCR |= SER_RTS; 1002 local_irq_save(flags); 1003 rtsdtr_ctrl(info->MCR); 1004 local_irq_restore(flags); 1005 } 1006 1007 /* 1008 * ------------------------------------------------------------ 1009 * rs_ioctl() and friends 1010 * ------------------------------------------------------------ 1011 */ 1012 1013 static int get_serial_info(struct tty_struct *tty, struct serial_state *state, 1014 struct serial_struct __user * retinfo) 1015 { 1016 struct serial_struct tmp; 1017 1018 if (!retinfo) 1019 return -EFAULT; 1020 memset(&tmp, 0, sizeof(tmp)); 1021 tty_lock(tty); 1022 tmp.line = tty->index; 1023 tmp.port = state->port; 1024 tmp.flags = state->tport.flags; 1025 tmp.xmit_fifo_size = state->xmit_fifo_size; 1026 tmp.baud_base = state->baud_base; 1027 tmp.close_delay = state->tport.close_delay; 1028 tmp.closing_wait = state->tport.closing_wait; 1029 tmp.custom_divisor = state->custom_divisor; 1030 tty_unlock(tty); 1031 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) 1032 return -EFAULT; 1033 return 0; 1034 } 1035 1036 static int set_serial_info(struct tty_struct *tty, struct serial_state *state, 1037 struct serial_struct __user * new_info) 1038 { 1039 struct tty_port *port = &state->tport; 1040 struct serial_struct new_serial; 1041 bool change_spd; 1042 int retval = 0; 1043 1044 if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) 1045 return -EFAULT; 1046 1047 tty_lock(tty); 1048 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || 1049 new_serial.custom_divisor != state->custom_divisor; 1050 if (new_serial.irq || new_serial.port != state->port || 1051 new_serial.xmit_fifo_size != state->xmit_fifo_size) { 1052 tty_unlock(tty); 1053 return -EINVAL; 1054 } 1055 1056 if (!serial_isroot()) { 1057 if ((new_serial.baud_base != state->baud_base) || 1058 (new_serial.close_delay != port->close_delay) || 1059 (new_serial.xmit_fifo_size != state->xmit_fifo_size) || 1060 ((new_serial.flags & ~ASYNC_USR_MASK) != 1061 (port->flags & ~ASYNC_USR_MASK))) { 1062 tty_unlock(tty); 1063 return -EPERM; 1064 } 1065 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1066 (new_serial.flags & ASYNC_USR_MASK)); 1067 state->custom_divisor = new_serial.custom_divisor; 1068 goto check_and_exit; 1069 } 1070 1071 if (new_serial.baud_base < 9600) { 1072 tty_unlock(tty); 1073 return -EINVAL; 1074 } 1075 1076 /* 1077 * OK, past this point, all the error checking has been done. 1078 * At this point, we start making changes..... 1079 */ 1080 1081 state->baud_base = new_serial.baud_base; 1082 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1083 (new_serial.flags & ASYNC_FLAGS)); 1084 state->custom_divisor = new_serial.custom_divisor; 1085 port->close_delay = new_serial.close_delay * HZ/100; 1086 port->closing_wait = new_serial.closing_wait * HZ/100; 1087 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1088 1089 check_and_exit: 1090 if (port->flags & ASYNC_INITIALIZED) { 1091 if (change_spd) { 1092 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 1093 tty->alt_speed = 57600; 1094 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 1095 tty->alt_speed = 115200; 1096 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 1097 tty->alt_speed = 230400; 1098 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 1099 tty->alt_speed = 460800; 1100 change_speed(tty, state, NULL); 1101 } 1102 } else 1103 retval = startup(tty, state); 1104 tty_unlock(tty); 1105 return retval; 1106 } 1107 1108 1109 /* 1110 * get_lsr_info - get line status register info 1111 * 1112 * Purpose: Let user call ioctl() to get info when the UART physically 1113 * is emptied. On bus types like RS485, the transmitter must 1114 * release the bus after transmitting. This must be done when 1115 * the transmit shift register is empty, not be done when the 1116 * transmit holding register is empty. This functionality 1117 * allows an RS485 driver to be written in user space. 1118 */ 1119 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1120 { 1121 unsigned char status; 1122 unsigned int result; 1123 unsigned long flags; 1124 1125 local_irq_save(flags); 1126 status = custom.serdatr; 1127 mb(); 1128 local_irq_restore(flags); 1129 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1130 if (copy_to_user(value, &result, sizeof(int))) 1131 return -EFAULT; 1132 return 0; 1133 } 1134 1135 1136 static int rs_tiocmget(struct tty_struct *tty) 1137 { 1138 struct serial_state *info = tty->driver_data; 1139 unsigned char control, status; 1140 unsigned long flags; 1141 1142 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1143 return -ENODEV; 1144 if (tty_io_error(tty)) 1145 return -EIO; 1146 1147 control = info->MCR; 1148 local_irq_save(flags); 1149 status = ciab.pra; 1150 local_irq_restore(flags); 1151 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1152 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1153 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1154 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1155 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1156 } 1157 1158 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1159 unsigned int clear) 1160 { 1161 struct serial_state *info = tty->driver_data; 1162 unsigned long flags; 1163 1164 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1165 return -ENODEV; 1166 if (tty_io_error(tty)) 1167 return -EIO; 1168 1169 local_irq_save(flags); 1170 if (set & TIOCM_RTS) 1171 info->MCR |= SER_RTS; 1172 if (set & TIOCM_DTR) 1173 info->MCR |= SER_DTR; 1174 if (clear & TIOCM_RTS) 1175 info->MCR &= ~SER_RTS; 1176 if (clear & TIOCM_DTR) 1177 info->MCR &= ~SER_DTR; 1178 rtsdtr_ctrl(info->MCR); 1179 local_irq_restore(flags); 1180 return 0; 1181 } 1182 1183 /* 1184 * rs_break() --- routine which turns the break handling on or off 1185 */ 1186 static int rs_break(struct tty_struct *tty, int break_state) 1187 { 1188 struct serial_state *info = tty->driver_data; 1189 unsigned long flags; 1190 1191 if (serial_paranoia_check(info, tty->name, "rs_break")) 1192 return -EINVAL; 1193 1194 local_irq_save(flags); 1195 if (break_state == -1) 1196 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1197 else 1198 custom.adkcon = AC_UARTBRK; 1199 mb(); 1200 local_irq_restore(flags); 1201 return 0; 1202 } 1203 1204 /* 1205 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1206 * Return: write counters to the user passed counter struct 1207 * NB: both 1->0 and 0->1 transitions are counted except for 1208 * RI where only 0->1 is counted. 1209 */ 1210 static int rs_get_icount(struct tty_struct *tty, 1211 struct serial_icounter_struct *icount) 1212 { 1213 struct serial_state *info = tty->driver_data; 1214 struct async_icount cnow; 1215 unsigned long flags; 1216 1217 local_irq_save(flags); 1218 cnow = info->icount; 1219 local_irq_restore(flags); 1220 icount->cts = cnow.cts; 1221 icount->dsr = cnow.dsr; 1222 icount->rng = cnow.rng; 1223 icount->dcd = cnow.dcd; 1224 icount->rx = cnow.rx; 1225 icount->tx = cnow.tx; 1226 icount->frame = cnow.frame; 1227 icount->overrun = cnow.overrun; 1228 icount->parity = cnow.parity; 1229 icount->brk = cnow.brk; 1230 icount->buf_overrun = cnow.buf_overrun; 1231 1232 return 0; 1233 } 1234 1235 static int rs_ioctl(struct tty_struct *tty, 1236 unsigned int cmd, unsigned long arg) 1237 { 1238 struct serial_state *info = tty->driver_data; 1239 struct async_icount cprev, cnow; /* kernel counter temps */ 1240 void __user *argp = (void __user *)arg; 1241 unsigned long flags; 1242 DEFINE_WAIT(wait); 1243 int ret; 1244 1245 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1246 return -ENODEV; 1247 1248 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1249 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1250 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1251 if (tty_io_error(tty)) 1252 return -EIO; 1253 } 1254 1255 switch (cmd) { 1256 case TIOCGSERIAL: 1257 return get_serial_info(tty, info, argp); 1258 case TIOCSSERIAL: 1259 return set_serial_info(tty, info, argp); 1260 case TIOCSERCONFIG: 1261 return 0; 1262 1263 case TIOCSERGETLSR: /* Get line status register */ 1264 return get_lsr_info(info, argp); 1265 1266 case TIOCSERGSTRUCT: 1267 if (copy_to_user(argp, 1268 info, sizeof(struct serial_state))) 1269 return -EFAULT; 1270 return 0; 1271 1272 /* 1273 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1274 * - mask passed in arg for lines of interest 1275 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1276 * Caller should use TIOCGICOUNT to see which one it was 1277 */ 1278 case TIOCMIWAIT: 1279 local_irq_save(flags); 1280 /* note the counters on entry */ 1281 cprev = info->icount; 1282 local_irq_restore(flags); 1283 while (1) { 1284 prepare_to_wait(&info->tport.delta_msr_wait, 1285 &wait, TASK_INTERRUPTIBLE); 1286 local_irq_save(flags); 1287 cnow = info->icount; /* atomic copy */ 1288 local_irq_restore(flags); 1289 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1290 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 1291 ret = -EIO; /* no change => error */ 1292 break; 1293 } 1294 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1295 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1296 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1297 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1298 ret = 0; 1299 break; 1300 } 1301 schedule(); 1302 /* see if a signal did it */ 1303 if (signal_pending(current)) { 1304 ret = -ERESTARTSYS; 1305 break; 1306 } 1307 cprev = cnow; 1308 } 1309 finish_wait(&info->tport.delta_msr_wait, &wait); 1310 return ret; 1311 1312 case TIOCSERGWILD: 1313 case TIOCSERSWILD: 1314 /* "setserial -W" is called in Debian boot */ 1315 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1316 return 0; 1317 1318 default: 1319 return -ENOIOCTLCMD; 1320 } 1321 return 0; 1322 } 1323 1324 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1325 { 1326 struct serial_state *info = tty->driver_data; 1327 unsigned long flags; 1328 unsigned int cflag = tty->termios.c_cflag; 1329 1330 change_speed(tty, info, old_termios); 1331 1332 /* Handle transition to B0 status */ 1333 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { 1334 info->MCR &= ~(SER_DTR|SER_RTS); 1335 local_irq_save(flags); 1336 rtsdtr_ctrl(info->MCR); 1337 local_irq_restore(flags); 1338 } 1339 1340 /* Handle transition away from B0 status */ 1341 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1342 info->MCR |= SER_DTR; 1343 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 1344 info->MCR |= SER_RTS; 1345 local_irq_save(flags); 1346 rtsdtr_ctrl(info->MCR); 1347 local_irq_restore(flags); 1348 } 1349 1350 /* Handle turning off CRTSCTS */ 1351 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 1352 tty->hw_stopped = 0; 1353 rs_start(tty); 1354 } 1355 1356 #if 0 1357 /* 1358 * No need to wake up processes in open wait, since they 1359 * sample the CLOCAL flag once, and don't recheck it. 1360 * XXX It's not clear whether the current behavior is correct 1361 * or not. Hence, this may change..... 1362 */ 1363 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1364 wake_up_interruptible(&info->open_wait); 1365 #endif 1366 } 1367 1368 /* 1369 * ------------------------------------------------------------ 1370 * rs_close() 1371 * 1372 * This routine is called when the serial port gets closed. First, we 1373 * wait for the last remaining data to be sent. Then, we unlink its 1374 * async structure from the interrupt chain if necessary, and we free 1375 * that IRQ if nothing is left in the chain. 1376 * ------------------------------------------------------------ 1377 */ 1378 static void rs_close(struct tty_struct *tty, struct file * filp) 1379 { 1380 struct serial_state *state = tty->driver_data; 1381 struct tty_port *port = &state->tport; 1382 1383 if (serial_paranoia_check(state, tty->name, "rs_close")) 1384 return; 1385 1386 if (tty_port_close_start(port, tty, filp) == 0) 1387 return; 1388 1389 /* 1390 * At this point we stop accepting input. To do this, we 1391 * disable the receive line status interrupts, and tell the 1392 * interrupt driver to stop checking the data ready bit in the 1393 * line status register. 1394 */ 1395 state->read_status_mask &= ~UART_LSR_DR; 1396 if (port->flags & ASYNC_INITIALIZED) { 1397 /* disable receive interrupts */ 1398 custom.intena = IF_RBF; 1399 mb(); 1400 /* clear any pending receive interrupt */ 1401 custom.intreq = IF_RBF; 1402 mb(); 1403 1404 /* 1405 * Before we drop DTR, make sure the UART transmitter 1406 * has completely drained; this is especially 1407 * important if there is a transmit FIFO! 1408 */ 1409 rs_wait_until_sent(tty, state->timeout); 1410 } 1411 shutdown(tty, state); 1412 rs_flush_buffer(tty); 1413 1414 tty_ldisc_flush(tty); 1415 port->tty = NULL; 1416 1417 tty_port_close_end(port, tty); 1418 } 1419 1420 /* 1421 * rs_wait_until_sent() --- wait until the transmitter is empty 1422 */ 1423 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1424 { 1425 struct serial_state *info = tty->driver_data; 1426 unsigned long orig_jiffies, char_time; 1427 int lsr; 1428 1429 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1430 return; 1431 1432 if (info->xmit_fifo_size == 0) 1433 return; /* Just in case.... */ 1434 1435 orig_jiffies = jiffies; 1436 1437 /* 1438 * Set the check interval to be 1/5 of the estimated time to 1439 * send a single character, and make it at least 1. The check 1440 * interval should also be less than the timeout. 1441 * 1442 * Note: we have to use pretty tight timings here to satisfy 1443 * the NIST-PCTS. 1444 */ 1445 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1446 char_time = char_time / 5; 1447 if (char_time == 0) 1448 char_time = 1; 1449 if (timeout) 1450 char_time = min_t(unsigned long, char_time, timeout); 1451 /* 1452 * If the transmitter hasn't cleared in twice the approximate 1453 * amount of time to send the entire FIFO, it probably won't 1454 * ever clear. This assumes the UART isn't doing flow 1455 * control, which is currently the case. Hence, if it ever 1456 * takes longer than info->timeout, this is probably due to a 1457 * UART bug of some kind. So, we clamp the timeout parameter at 1458 * 2*info->timeout. 1459 */ 1460 if (!timeout || timeout > 2*info->timeout) 1461 timeout = 2*info->timeout; 1462 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1463 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1464 printk("jiff=%lu...", jiffies); 1465 #endif 1466 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1467 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1468 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1469 #endif 1470 msleep_interruptible(jiffies_to_msecs(char_time)); 1471 if (signal_pending(current)) 1472 break; 1473 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1474 break; 1475 } 1476 __set_current_state(TASK_RUNNING); 1477 1478 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1479 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1480 #endif 1481 } 1482 1483 /* 1484 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1485 */ 1486 static void rs_hangup(struct tty_struct *tty) 1487 { 1488 struct serial_state *info = tty->driver_data; 1489 1490 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1491 return; 1492 1493 rs_flush_buffer(tty); 1494 shutdown(tty, info); 1495 info->tport.count = 0; 1496 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; 1497 info->tport.tty = NULL; 1498 wake_up_interruptible(&info->tport.open_wait); 1499 } 1500 1501 /* 1502 * This routine is called whenever a serial port is opened. It 1503 * enables interrupts for a serial port, linking in its async structure into 1504 * the IRQ chain. It also performs the serial-specific 1505 * initialization for the tty structure. 1506 */ 1507 static int rs_open(struct tty_struct *tty, struct file * filp) 1508 { 1509 struct serial_state *info = rs_table + tty->index; 1510 struct tty_port *port = &info->tport; 1511 int retval; 1512 1513 port->count++; 1514 port->tty = tty; 1515 tty->driver_data = info; 1516 tty->port = port; 1517 if (serial_paranoia_check(info, tty->name, "rs_open")) 1518 return -ENODEV; 1519 1520 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1521 1522 retval = startup(tty, info); 1523 if (retval) { 1524 return retval; 1525 } 1526 1527 return tty_port_block_til_ready(port, tty, filp); 1528 } 1529 1530 /* 1531 * /proc fs routines.... 1532 */ 1533 1534 static inline void line_info(struct seq_file *m, int line, 1535 struct serial_state *state) 1536 { 1537 char stat_buf[30], control, status; 1538 unsigned long flags; 1539 1540 seq_printf(m, "%d: uart:amiga_builtin", line); 1541 1542 local_irq_save(flags); 1543 status = ciab.pra; 1544 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status; 1545 local_irq_restore(flags); 1546 1547 stat_buf[0] = 0; 1548 stat_buf[1] = 0; 1549 if(!(control & SER_RTS)) 1550 strcat(stat_buf, "|RTS"); 1551 if(!(status & SER_CTS)) 1552 strcat(stat_buf, "|CTS"); 1553 if(!(control & SER_DTR)) 1554 strcat(stat_buf, "|DTR"); 1555 if(!(status & SER_DSR)) 1556 strcat(stat_buf, "|DSR"); 1557 if(!(status & SER_DCD)) 1558 strcat(stat_buf, "|CD"); 1559 1560 if (state->quot) 1561 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1562 1563 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1564 1565 if (state->icount.frame) 1566 seq_printf(m, " fe:%d", state->icount.frame); 1567 1568 if (state->icount.parity) 1569 seq_printf(m, " pe:%d", state->icount.parity); 1570 1571 if (state->icount.brk) 1572 seq_printf(m, " brk:%d", state->icount.brk); 1573 1574 if (state->icount.overrun) 1575 seq_printf(m, " oe:%d", state->icount.overrun); 1576 1577 /* 1578 * Last thing is the RS-232 status lines 1579 */ 1580 seq_printf(m, " %s\n", stat_buf+1); 1581 } 1582 1583 static int rs_proc_show(struct seq_file *m, void *v) 1584 { 1585 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1586 line_info(m, 0, &rs_table[0]); 1587 return 0; 1588 } 1589 1590 static int rs_proc_open(struct inode *inode, struct file *file) 1591 { 1592 return single_open(file, rs_proc_show, NULL); 1593 } 1594 1595 static const struct file_operations rs_proc_fops = { 1596 .owner = THIS_MODULE, 1597 .open = rs_proc_open, 1598 .read = seq_read, 1599 .llseek = seq_lseek, 1600 .release = single_release, 1601 }; 1602 1603 /* 1604 * --------------------------------------------------------------------- 1605 * rs_init() and friends 1606 * 1607 * rs_init() is called at boot-time to initialize the serial driver. 1608 * --------------------------------------------------------------------- 1609 */ 1610 1611 /* 1612 * This routine prints out the appropriate serial driver version 1613 * number, and identifies which options were configured into this 1614 * driver. 1615 */ 1616 static void show_serial_version(void) 1617 { 1618 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1619 } 1620 1621 1622 static const struct tty_operations serial_ops = { 1623 .open = rs_open, 1624 .close = rs_close, 1625 .write = rs_write, 1626 .put_char = rs_put_char, 1627 .flush_chars = rs_flush_chars, 1628 .write_room = rs_write_room, 1629 .chars_in_buffer = rs_chars_in_buffer, 1630 .flush_buffer = rs_flush_buffer, 1631 .ioctl = rs_ioctl, 1632 .throttle = rs_throttle, 1633 .unthrottle = rs_unthrottle, 1634 .set_termios = rs_set_termios, 1635 .stop = rs_stop, 1636 .start = rs_start, 1637 .hangup = rs_hangup, 1638 .break_ctl = rs_break, 1639 .send_xchar = rs_send_xchar, 1640 .wait_until_sent = rs_wait_until_sent, 1641 .tiocmget = rs_tiocmget, 1642 .tiocmset = rs_tiocmset, 1643 .get_icount = rs_get_icount, 1644 .proc_fops = &rs_proc_fops, 1645 }; 1646 1647 static int amiga_carrier_raised(struct tty_port *port) 1648 { 1649 return !(ciab.pra & SER_DCD); 1650 } 1651 1652 static void amiga_dtr_rts(struct tty_port *port, int raise) 1653 { 1654 struct serial_state *info = container_of(port, struct serial_state, 1655 tport); 1656 unsigned long flags; 1657 1658 if (raise) 1659 info->MCR |= SER_DTR|SER_RTS; 1660 else 1661 info->MCR &= ~(SER_DTR|SER_RTS); 1662 1663 local_irq_save(flags); 1664 rtsdtr_ctrl(info->MCR); 1665 local_irq_restore(flags); 1666 } 1667 1668 static const struct tty_port_operations amiga_port_ops = { 1669 .carrier_raised = amiga_carrier_raised, 1670 .dtr_rts = amiga_dtr_rts, 1671 }; 1672 1673 /* 1674 * The serial driver boot-time initialization code! 1675 */ 1676 static int __init amiga_serial_probe(struct platform_device *pdev) 1677 { 1678 unsigned long flags; 1679 struct serial_state * state; 1680 int error; 1681 1682 serial_driver = alloc_tty_driver(NR_PORTS); 1683 if (!serial_driver) 1684 return -ENOMEM; 1685 1686 show_serial_version(); 1687 1688 /* Initialize the tty_driver structure */ 1689 1690 serial_driver->driver_name = "amiserial"; 1691 serial_driver->name = "ttyS"; 1692 serial_driver->major = TTY_MAJOR; 1693 serial_driver->minor_start = 64; 1694 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1695 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1696 serial_driver->init_termios = tty_std_termios; 1697 serial_driver->init_termios.c_cflag = 1698 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1699 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1700 tty_set_operations(serial_driver, &serial_ops); 1701 1702 state = rs_table; 1703 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1704 state->custom_divisor = 0; 1705 state->icount.cts = state->icount.dsr = 1706 state->icount.rng = state->icount.dcd = 0; 1707 state->icount.rx = state->icount.tx = 0; 1708 state->icount.frame = state->icount.parity = 0; 1709 state->icount.overrun = state->icount.brk = 0; 1710 tty_port_init(&state->tport); 1711 state->tport.ops = &amiga_port_ops; 1712 tty_port_link_device(&state->tport, serial_driver, 0); 1713 1714 error = tty_register_driver(serial_driver); 1715 if (error) 1716 goto fail_put_tty_driver; 1717 1718 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1719 1720 /* Hardware set up */ 1721 1722 state->baud_base = amiga_colorclock; 1723 state->xmit_fifo_size = 1; 1724 1725 /* set ISRs, and then disable the rx interrupts */ 1726 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1727 if (error) 1728 goto fail_unregister; 1729 1730 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1731 "serial RX", state); 1732 if (error) 1733 goto fail_free_irq; 1734 1735 local_irq_save(flags); 1736 1737 /* turn off Rx and Tx interrupts */ 1738 custom.intena = IF_RBF | IF_TBE; 1739 mb(); 1740 1741 /* clear any pending interrupt */ 1742 custom.intreq = IF_RBF | IF_TBE; 1743 mb(); 1744 1745 local_irq_restore(flags); 1746 1747 /* 1748 * set the appropriate directions for the modem control flags, 1749 * and clear RTS and DTR 1750 */ 1751 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1752 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1753 1754 platform_set_drvdata(pdev, state); 1755 1756 return 0; 1757 1758 fail_free_irq: 1759 free_irq(IRQ_AMIGA_TBE, state); 1760 fail_unregister: 1761 tty_unregister_driver(serial_driver); 1762 fail_put_tty_driver: 1763 tty_port_destroy(&state->tport); 1764 put_tty_driver(serial_driver); 1765 return error; 1766 } 1767 1768 static int __exit amiga_serial_remove(struct platform_device *pdev) 1769 { 1770 int error; 1771 struct serial_state *state = platform_get_drvdata(pdev); 1772 1773 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1774 error = tty_unregister_driver(serial_driver); 1775 if (error) 1776 printk("SERIAL: failed to unregister serial driver (%d)\n", 1777 error); 1778 put_tty_driver(serial_driver); 1779 tty_port_destroy(&state->tport); 1780 1781 free_irq(IRQ_AMIGA_TBE, state); 1782 free_irq(IRQ_AMIGA_RBF, state); 1783 1784 return error; 1785 } 1786 1787 static struct platform_driver amiga_serial_driver = { 1788 .remove = __exit_p(amiga_serial_remove), 1789 .driver = { 1790 .name = "amiga-serial", 1791 }, 1792 }; 1793 1794 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1795 1796 1797 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1798 1799 /* 1800 * ------------------------------------------------------------ 1801 * Serial console driver 1802 * ------------------------------------------------------------ 1803 */ 1804 1805 static void amiga_serial_putc(char c) 1806 { 1807 custom.serdat = (unsigned char)c | 0x100; 1808 while (!(custom.serdatr & 0x2000)) 1809 barrier(); 1810 } 1811 1812 /* 1813 * Print a string to the serial port trying not to disturb 1814 * any possible real use of the port... 1815 * 1816 * The console must be locked when we get here. 1817 */ 1818 static void serial_console_write(struct console *co, const char *s, 1819 unsigned count) 1820 { 1821 unsigned short intena = custom.intenar; 1822 1823 custom.intena = IF_TBE; 1824 1825 while (count--) { 1826 if (*s == '\n') 1827 amiga_serial_putc('\r'); 1828 amiga_serial_putc(*s++); 1829 } 1830 1831 custom.intena = IF_SETCLR | (intena & IF_TBE); 1832 } 1833 1834 static struct tty_driver *serial_console_device(struct console *c, int *index) 1835 { 1836 *index = 0; 1837 return serial_driver; 1838 } 1839 1840 static struct console sercons = { 1841 .name = "ttyS", 1842 .write = serial_console_write, 1843 .device = serial_console_device, 1844 .flags = CON_PRINTBUFFER, 1845 .index = -1, 1846 }; 1847 1848 /* 1849 * Register console. 1850 */ 1851 static int __init amiserial_console_init(void) 1852 { 1853 if (!MACH_IS_AMIGA) 1854 return -ENODEV; 1855 1856 register_console(&sercons); 1857 return 0; 1858 } 1859 console_initcall(amiserial_console_init); 1860 1861 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1862 1863 MODULE_LICENSE("GPL"); 1864 MODULE_ALIAS("platform:amiga-serial"); 1865