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 if (cflag & CRTSCTS) { 731 port->flags |= ASYNC_CTS_FLOW; 732 info->IER |= UART_IER_MSI; 733 } else 734 port->flags &= ~ASYNC_CTS_FLOW; 735 if (cflag & CLOCAL) 736 port->flags &= ~ASYNC_CHECK_CD; 737 else { 738 port->flags |= ASYNC_CHECK_CD; 739 info->IER |= UART_IER_MSI; 740 } 741 /* TBD: 742 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 743 */ 744 745 /* 746 * Set up parity check flag 747 */ 748 749 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 750 if (I_INPCK(tty)) 751 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 752 if (I_BRKINT(tty) || I_PARMRK(tty)) 753 info->read_status_mask |= UART_LSR_BI; 754 755 /* 756 * Characters to ignore 757 */ 758 info->ignore_status_mask = 0; 759 if (I_IGNPAR(tty)) 760 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 761 if (I_IGNBRK(tty)) { 762 info->ignore_status_mask |= UART_LSR_BI; 763 /* 764 * If we're ignore parity and break indicators, ignore 765 * overruns too. (For real raw support). 766 */ 767 if (I_IGNPAR(tty)) 768 info->ignore_status_mask |= UART_LSR_OE; 769 } 770 /* 771 * !!! ignore all characters if CREAD is not set 772 */ 773 if ((cflag & CREAD) == 0) 774 info->ignore_status_mask |= UART_LSR_DR; 775 local_irq_save(flags); 776 777 { 778 short serper; 779 780 /* Set up the baud rate */ 781 serper = quot - 1; 782 783 /* Enable or disable parity bit */ 784 785 if(cval & UART_LCR_PARITY) 786 serper |= (SERPER_PARENB); 787 788 custom.serper = serper; 789 mb(); 790 } 791 792 local_irq_restore(flags); 793 } 794 795 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 796 { 797 struct serial_state *info; 798 unsigned long flags; 799 800 info = tty->driver_data; 801 802 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 803 return 0; 804 805 if (!info->xmit.buf) 806 return 0; 807 808 local_irq_save(flags); 809 if (CIRC_SPACE(info->xmit.head, 810 info->xmit.tail, 811 SERIAL_XMIT_SIZE) == 0) { 812 local_irq_restore(flags); 813 return 0; 814 } 815 816 info->xmit.buf[info->xmit.head++] = ch; 817 info->xmit.head &= SERIAL_XMIT_SIZE-1; 818 local_irq_restore(flags); 819 return 1; 820 } 821 822 static void rs_flush_chars(struct tty_struct *tty) 823 { 824 struct serial_state *info = tty->driver_data; 825 unsigned long flags; 826 827 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 828 return; 829 830 if (info->xmit.head == info->xmit.tail 831 || tty->stopped 832 || tty->hw_stopped 833 || !info->xmit.buf) 834 return; 835 836 local_irq_save(flags); 837 info->IER |= UART_IER_THRI; 838 custom.intena = IF_SETCLR | IF_TBE; 839 mb(); 840 /* set a pending Tx Interrupt, transmitter should restart now */ 841 custom.intreq = IF_SETCLR | IF_TBE; 842 mb(); 843 local_irq_restore(flags); 844 } 845 846 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 847 { 848 int c, ret = 0; 849 struct serial_state *info = tty->driver_data; 850 unsigned long flags; 851 852 if (serial_paranoia_check(info, tty->name, "rs_write")) 853 return 0; 854 855 if (!info->xmit.buf) 856 return 0; 857 858 local_irq_save(flags); 859 while (1) { 860 c = CIRC_SPACE_TO_END(info->xmit.head, 861 info->xmit.tail, 862 SERIAL_XMIT_SIZE); 863 if (count < c) 864 c = count; 865 if (c <= 0) { 866 break; 867 } 868 memcpy(info->xmit.buf + info->xmit.head, buf, c); 869 info->xmit.head = ((info->xmit.head + c) & 870 (SERIAL_XMIT_SIZE-1)); 871 buf += c; 872 count -= c; 873 ret += c; 874 } 875 local_irq_restore(flags); 876 877 if (info->xmit.head != info->xmit.tail 878 && !tty->stopped 879 && !tty->hw_stopped 880 && !(info->IER & UART_IER_THRI)) { 881 info->IER |= UART_IER_THRI; 882 local_irq_disable(); 883 custom.intena = IF_SETCLR | IF_TBE; 884 mb(); 885 /* set a pending Tx Interrupt, transmitter should restart now */ 886 custom.intreq = IF_SETCLR | IF_TBE; 887 mb(); 888 local_irq_restore(flags); 889 } 890 return ret; 891 } 892 893 static int rs_write_room(struct tty_struct *tty) 894 { 895 struct serial_state *info = tty->driver_data; 896 897 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 898 return 0; 899 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 900 } 901 902 static int rs_chars_in_buffer(struct tty_struct *tty) 903 { 904 struct serial_state *info = tty->driver_data; 905 906 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 907 return 0; 908 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 909 } 910 911 static void rs_flush_buffer(struct tty_struct *tty) 912 { 913 struct serial_state *info = tty->driver_data; 914 unsigned long flags; 915 916 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 917 return; 918 local_irq_save(flags); 919 info->xmit.head = info->xmit.tail = 0; 920 local_irq_restore(flags); 921 tty_wakeup(tty); 922 } 923 924 /* 925 * This function is used to send a high-priority XON/XOFF character to 926 * the device 927 */ 928 static void rs_send_xchar(struct tty_struct *tty, char ch) 929 { 930 struct serial_state *info = tty->driver_data; 931 unsigned long flags; 932 933 if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) 934 return; 935 936 info->x_char = ch; 937 if (ch) { 938 /* Make sure transmit interrupts are on */ 939 940 /* Check this ! */ 941 local_irq_save(flags); 942 if(!(custom.intenar & IF_TBE)) { 943 custom.intena = IF_SETCLR | IF_TBE; 944 mb(); 945 /* set a pending Tx Interrupt, transmitter should restart now */ 946 custom.intreq = IF_SETCLR | IF_TBE; 947 mb(); 948 } 949 local_irq_restore(flags); 950 951 info->IER |= UART_IER_THRI; 952 } 953 } 954 955 /* 956 * ------------------------------------------------------------ 957 * rs_throttle() 958 * 959 * This routine is called by the upper-layer tty layer to signal that 960 * incoming characters should be throttled. 961 * ------------------------------------------------------------ 962 */ 963 static void rs_throttle(struct tty_struct * tty) 964 { 965 struct serial_state *info = tty->driver_data; 966 unsigned long flags; 967 #ifdef SERIAL_DEBUG_THROTTLE 968 printk("throttle %s ....\n", tty_name(tty)); 969 #endif 970 971 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 972 return; 973 974 if (I_IXOFF(tty)) 975 rs_send_xchar(tty, STOP_CHAR(tty)); 976 977 if (C_CRTSCTS(tty)) 978 info->MCR &= ~SER_RTS; 979 980 local_irq_save(flags); 981 rtsdtr_ctrl(info->MCR); 982 local_irq_restore(flags); 983 } 984 985 static void rs_unthrottle(struct tty_struct * tty) 986 { 987 struct serial_state *info = tty->driver_data; 988 unsigned long flags; 989 #ifdef SERIAL_DEBUG_THROTTLE 990 printk("unthrottle %s ....\n", tty_name(tty)); 991 #endif 992 993 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 994 return; 995 996 if (I_IXOFF(tty)) { 997 if (info->x_char) 998 info->x_char = 0; 999 else 1000 rs_send_xchar(tty, START_CHAR(tty)); 1001 } 1002 if (C_CRTSCTS(tty)) 1003 info->MCR |= SER_RTS; 1004 local_irq_save(flags); 1005 rtsdtr_ctrl(info->MCR); 1006 local_irq_restore(flags); 1007 } 1008 1009 /* 1010 * ------------------------------------------------------------ 1011 * rs_ioctl() and friends 1012 * ------------------------------------------------------------ 1013 */ 1014 1015 static int get_serial_info(struct tty_struct *tty, struct serial_state *state, 1016 struct serial_struct __user * retinfo) 1017 { 1018 struct serial_struct tmp; 1019 1020 if (!retinfo) 1021 return -EFAULT; 1022 memset(&tmp, 0, sizeof(tmp)); 1023 tty_lock(tty); 1024 tmp.line = tty->index; 1025 tmp.port = state->port; 1026 tmp.flags = state->tport.flags; 1027 tmp.xmit_fifo_size = state->xmit_fifo_size; 1028 tmp.baud_base = state->baud_base; 1029 tmp.close_delay = state->tport.close_delay; 1030 tmp.closing_wait = state->tport.closing_wait; 1031 tmp.custom_divisor = state->custom_divisor; 1032 tty_unlock(tty); 1033 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) 1034 return -EFAULT; 1035 return 0; 1036 } 1037 1038 static int set_serial_info(struct tty_struct *tty, struct serial_state *state, 1039 struct serial_struct __user * new_info) 1040 { 1041 struct tty_port *port = &state->tport; 1042 struct serial_struct new_serial; 1043 bool change_spd; 1044 int retval = 0; 1045 1046 if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) 1047 return -EFAULT; 1048 1049 tty_lock(tty); 1050 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || 1051 new_serial.custom_divisor != state->custom_divisor; 1052 if (new_serial.irq || new_serial.port != state->port || 1053 new_serial.xmit_fifo_size != state->xmit_fifo_size) { 1054 tty_unlock(tty); 1055 return -EINVAL; 1056 } 1057 1058 if (!serial_isroot()) { 1059 if ((new_serial.baud_base != state->baud_base) || 1060 (new_serial.close_delay != port->close_delay) || 1061 (new_serial.xmit_fifo_size != state->xmit_fifo_size) || 1062 ((new_serial.flags & ~ASYNC_USR_MASK) != 1063 (port->flags & ~ASYNC_USR_MASK))) { 1064 tty_unlock(tty); 1065 return -EPERM; 1066 } 1067 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1068 (new_serial.flags & ASYNC_USR_MASK)); 1069 state->custom_divisor = new_serial.custom_divisor; 1070 goto check_and_exit; 1071 } 1072 1073 if (new_serial.baud_base < 9600) { 1074 tty_unlock(tty); 1075 return -EINVAL; 1076 } 1077 1078 /* 1079 * OK, past this point, all the error checking has been done. 1080 * At this point, we start making changes..... 1081 */ 1082 1083 state->baud_base = new_serial.baud_base; 1084 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1085 (new_serial.flags & ASYNC_FLAGS)); 1086 state->custom_divisor = new_serial.custom_divisor; 1087 port->close_delay = new_serial.close_delay * HZ/100; 1088 port->closing_wait = new_serial.closing_wait * HZ/100; 1089 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1090 1091 check_and_exit: 1092 if (port->flags & ASYNC_INITIALIZED) { 1093 if (change_spd) { 1094 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 1095 tty->alt_speed = 57600; 1096 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 1097 tty->alt_speed = 115200; 1098 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 1099 tty->alt_speed = 230400; 1100 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 1101 tty->alt_speed = 460800; 1102 change_speed(tty, state, NULL); 1103 } 1104 } else 1105 retval = startup(tty, state); 1106 tty_unlock(tty); 1107 return retval; 1108 } 1109 1110 1111 /* 1112 * get_lsr_info - get line status register info 1113 * 1114 * Purpose: Let user call ioctl() to get info when the UART physically 1115 * is emptied. On bus types like RS485, the transmitter must 1116 * release the bus after transmitting. This must be done when 1117 * the transmit shift register is empty, not be done when the 1118 * transmit holding register is empty. This functionality 1119 * allows an RS485 driver to be written in user space. 1120 */ 1121 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1122 { 1123 unsigned char status; 1124 unsigned int result; 1125 unsigned long flags; 1126 1127 local_irq_save(flags); 1128 status = custom.serdatr; 1129 mb(); 1130 local_irq_restore(flags); 1131 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1132 if (copy_to_user(value, &result, sizeof(int))) 1133 return -EFAULT; 1134 return 0; 1135 } 1136 1137 1138 static int rs_tiocmget(struct tty_struct *tty) 1139 { 1140 struct serial_state *info = tty->driver_data; 1141 unsigned char control, status; 1142 unsigned long flags; 1143 1144 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1145 return -ENODEV; 1146 if (tty->flags & (1 << TTY_IO_ERROR)) 1147 return -EIO; 1148 1149 control = info->MCR; 1150 local_irq_save(flags); 1151 status = ciab.pra; 1152 local_irq_restore(flags); 1153 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1154 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1155 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1156 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1157 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1158 } 1159 1160 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1161 unsigned int clear) 1162 { 1163 struct serial_state *info = tty->driver_data; 1164 unsigned long flags; 1165 1166 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1167 return -ENODEV; 1168 if (tty->flags & (1 << TTY_IO_ERROR)) 1169 return -EIO; 1170 1171 local_irq_save(flags); 1172 if (set & TIOCM_RTS) 1173 info->MCR |= SER_RTS; 1174 if (set & TIOCM_DTR) 1175 info->MCR |= SER_DTR; 1176 if (clear & TIOCM_RTS) 1177 info->MCR &= ~SER_RTS; 1178 if (clear & TIOCM_DTR) 1179 info->MCR &= ~SER_DTR; 1180 rtsdtr_ctrl(info->MCR); 1181 local_irq_restore(flags); 1182 return 0; 1183 } 1184 1185 /* 1186 * rs_break() --- routine which turns the break handling on or off 1187 */ 1188 static int rs_break(struct tty_struct *tty, int break_state) 1189 { 1190 struct serial_state *info = tty->driver_data; 1191 unsigned long flags; 1192 1193 if (serial_paranoia_check(info, tty->name, "rs_break")) 1194 return -EINVAL; 1195 1196 local_irq_save(flags); 1197 if (break_state == -1) 1198 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1199 else 1200 custom.adkcon = AC_UARTBRK; 1201 mb(); 1202 local_irq_restore(flags); 1203 return 0; 1204 } 1205 1206 /* 1207 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1208 * Return: write counters to the user passed counter struct 1209 * NB: both 1->0 and 0->1 transitions are counted except for 1210 * RI where only 0->1 is counted. 1211 */ 1212 static int rs_get_icount(struct tty_struct *tty, 1213 struct serial_icounter_struct *icount) 1214 { 1215 struct serial_state *info = tty->driver_data; 1216 struct async_icount cnow; 1217 unsigned long flags; 1218 1219 local_irq_save(flags); 1220 cnow = info->icount; 1221 local_irq_restore(flags); 1222 icount->cts = cnow.cts; 1223 icount->dsr = cnow.dsr; 1224 icount->rng = cnow.rng; 1225 icount->dcd = cnow.dcd; 1226 icount->rx = cnow.rx; 1227 icount->tx = cnow.tx; 1228 icount->frame = cnow.frame; 1229 icount->overrun = cnow.overrun; 1230 icount->parity = cnow.parity; 1231 icount->brk = cnow.brk; 1232 icount->buf_overrun = cnow.buf_overrun; 1233 1234 return 0; 1235 } 1236 1237 static int rs_ioctl(struct tty_struct *tty, 1238 unsigned int cmd, unsigned long arg) 1239 { 1240 struct serial_state *info = tty->driver_data; 1241 struct async_icount cprev, cnow; /* kernel counter temps */ 1242 void __user *argp = (void __user *)arg; 1243 unsigned long flags; 1244 DEFINE_WAIT(wait); 1245 int ret; 1246 1247 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1248 return -ENODEV; 1249 1250 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1251 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1252 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1253 if (tty->flags & (1 << TTY_IO_ERROR)) 1254 return -EIO; 1255 } 1256 1257 switch (cmd) { 1258 case TIOCGSERIAL: 1259 return get_serial_info(tty, info, argp); 1260 case TIOCSSERIAL: 1261 return set_serial_info(tty, info, argp); 1262 case TIOCSERCONFIG: 1263 return 0; 1264 1265 case TIOCSERGETLSR: /* Get line status register */ 1266 return get_lsr_info(info, argp); 1267 1268 case TIOCSERGSTRUCT: 1269 if (copy_to_user(argp, 1270 info, sizeof(struct serial_state))) 1271 return -EFAULT; 1272 return 0; 1273 1274 /* 1275 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1276 * - mask passed in arg for lines of interest 1277 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1278 * Caller should use TIOCGICOUNT to see which one it was 1279 */ 1280 case TIOCMIWAIT: 1281 local_irq_save(flags); 1282 /* note the counters on entry */ 1283 cprev = info->icount; 1284 local_irq_restore(flags); 1285 while (1) { 1286 prepare_to_wait(&info->tport.delta_msr_wait, 1287 &wait, TASK_INTERRUPTIBLE); 1288 local_irq_save(flags); 1289 cnow = info->icount; /* atomic copy */ 1290 local_irq_restore(flags); 1291 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1292 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 1293 ret = -EIO; /* no change => error */ 1294 break; 1295 } 1296 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1297 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1298 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1299 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1300 ret = 0; 1301 break; 1302 } 1303 schedule(); 1304 /* see if a signal did it */ 1305 if (signal_pending(current)) { 1306 ret = -ERESTARTSYS; 1307 break; 1308 } 1309 cprev = cnow; 1310 } 1311 finish_wait(&info->tport.delta_msr_wait, &wait); 1312 return ret; 1313 1314 case TIOCSERGWILD: 1315 case TIOCSERSWILD: 1316 /* "setserial -W" is called in Debian boot */ 1317 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1318 return 0; 1319 1320 default: 1321 return -ENOIOCTLCMD; 1322 } 1323 return 0; 1324 } 1325 1326 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1327 { 1328 struct serial_state *info = tty->driver_data; 1329 unsigned long flags; 1330 unsigned int cflag = tty->termios.c_cflag; 1331 1332 change_speed(tty, info, old_termios); 1333 1334 /* Handle transition to B0 status */ 1335 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { 1336 info->MCR &= ~(SER_DTR|SER_RTS); 1337 local_irq_save(flags); 1338 rtsdtr_ctrl(info->MCR); 1339 local_irq_restore(flags); 1340 } 1341 1342 /* Handle transition away from B0 status */ 1343 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1344 info->MCR |= SER_DTR; 1345 if (!C_CRTSCTS(tty) || !test_bit(TTY_THROTTLED, &tty->flags)) 1346 info->MCR |= SER_RTS; 1347 local_irq_save(flags); 1348 rtsdtr_ctrl(info->MCR); 1349 local_irq_restore(flags); 1350 } 1351 1352 /* Handle turning off CRTSCTS */ 1353 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 1354 tty->hw_stopped = 0; 1355 rs_start(tty); 1356 } 1357 1358 #if 0 1359 /* 1360 * No need to wake up processes in open wait, since they 1361 * sample the CLOCAL flag once, and don't recheck it. 1362 * XXX It's not clear whether the current behavior is correct 1363 * or not. Hence, this may change..... 1364 */ 1365 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1366 wake_up_interruptible(&info->open_wait); 1367 #endif 1368 } 1369 1370 /* 1371 * ------------------------------------------------------------ 1372 * rs_close() 1373 * 1374 * This routine is called when the serial port gets closed. First, we 1375 * wait for the last remaining data to be sent. Then, we unlink its 1376 * async structure from the interrupt chain if necessary, and we free 1377 * that IRQ if nothing is left in the chain. 1378 * ------------------------------------------------------------ 1379 */ 1380 static void rs_close(struct tty_struct *tty, struct file * filp) 1381 { 1382 struct serial_state *state = tty->driver_data; 1383 struct tty_port *port = &state->tport; 1384 1385 if (serial_paranoia_check(state, tty->name, "rs_close")) 1386 return; 1387 1388 if (tty_port_close_start(port, tty, filp) == 0) 1389 return; 1390 1391 /* 1392 * At this point we stop accepting input. To do this, we 1393 * disable the receive line status interrupts, and tell the 1394 * interrupt driver to stop checking the data ready bit in the 1395 * line status register. 1396 */ 1397 state->read_status_mask &= ~UART_LSR_DR; 1398 if (port->flags & ASYNC_INITIALIZED) { 1399 /* disable receive interrupts */ 1400 custom.intena = IF_RBF; 1401 mb(); 1402 /* clear any pending receive interrupt */ 1403 custom.intreq = IF_RBF; 1404 mb(); 1405 1406 /* 1407 * Before we drop DTR, make sure the UART transmitter 1408 * has completely drained; this is especially 1409 * important if there is a transmit FIFO! 1410 */ 1411 rs_wait_until_sent(tty, state->timeout); 1412 } 1413 shutdown(tty, state); 1414 rs_flush_buffer(tty); 1415 1416 tty_ldisc_flush(tty); 1417 port->tty = NULL; 1418 1419 tty_port_close_end(port, tty); 1420 } 1421 1422 /* 1423 * rs_wait_until_sent() --- wait until the transmitter is empty 1424 */ 1425 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1426 { 1427 struct serial_state *info = tty->driver_data; 1428 unsigned long orig_jiffies, char_time; 1429 int lsr; 1430 1431 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1432 return; 1433 1434 if (info->xmit_fifo_size == 0) 1435 return; /* Just in case.... */ 1436 1437 orig_jiffies = jiffies; 1438 1439 /* 1440 * Set the check interval to be 1/5 of the estimated time to 1441 * send a single character, and make it at least 1. The check 1442 * interval should also be less than the timeout. 1443 * 1444 * Note: we have to use pretty tight timings here to satisfy 1445 * the NIST-PCTS. 1446 */ 1447 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1448 char_time = char_time / 5; 1449 if (char_time == 0) 1450 char_time = 1; 1451 if (timeout) 1452 char_time = min_t(unsigned long, char_time, timeout); 1453 /* 1454 * If the transmitter hasn't cleared in twice the approximate 1455 * amount of time to send the entire FIFO, it probably won't 1456 * ever clear. This assumes the UART isn't doing flow 1457 * control, which is currently the case. Hence, if it ever 1458 * takes longer than info->timeout, this is probably due to a 1459 * UART bug of some kind. So, we clamp the timeout parameter at 1460 * 2*info->timeout. 1461 */ 1462 if (!timeout || timeout > 2*info->timeout) 1463 timeout = 2*info->timeout; 1464 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1465 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1466 printk("jiff=%lu...", jiffies); 1467 #endif 1468 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1469 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1470 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1471 #endif 1472 msleep_interruptible(jiffies_to_msecs(char_time)); 1473 if (signal_pending(current)) 1474 break; 1475 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1476 break; 1477 } 1478 __set_current_state(TASK_RUNNING); 1479 1480 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1481 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1482 #endif 1483 } 1484 1485 /* 1486 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1487 */ 1488 static void rs_hangup(struct tty_struct *tty) 1489 { 1490 struct serial_state *info = tty->driver_data; 1491 1492 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1493 return; 1494 1495 rs_flush_buffer(tty); 1496 shutdown(tty, info); 1497 info->tport.count = 0; 1498 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; 1499 info->tport.tty = NULL; 1500 wake_up_interruptible(&info->tport.open_wait); 1501 } 1502 1503 /* 1504 * This routine is called whenever a serial port is opened. It 1505 * enables interrupts for a serial port, linking in its async structure into 1506 * the IRQ chain. It also performs the serial-specific 1507 * initialization for the tty structure. 1508 */ 1509 static int rs_open(struct tty_struct *tty, struct file * filp) 1510 { 1511 struct serial_state *info = rs_table + tty->index; 1512 struct tty_port *port = &info->tport; 1513 int retval; 1514 1515 port->count++; 1516 port->tty = tty; 1517 tty->driver_data = info; 1518 tty->port = port; 1519 if (serial_paranoia_check(info, tty->name, "rs_open")) 1520 return -ENODEV; 1521 1522 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1523 1524 retval = startup(tty, info); 1525 if (retval) { 1526 return retval; 1527 } 1528 1529 return tty_port_block_til_ready(port, tty, filp); 1530 } 1531 1532 /* 1533 * /proc fs routines.... 1534 */ 1535 1536 static inline void line_info(struct seq_file *m, int line, 1537 struct serial_state *state) 1538 { 1539 char stat_buf[30], control, status; 1540 unsigned long flags; 1541 1542 seq_printf(m, "%d: uart:amiga_builtin", line); 1543 1544 local_irq_save(flags); 1545 status = ciab.pra; 1546 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status; 1547 local_irq_restore(flags); 1548 1549 stat_buf[0] = 0; 1550 stat_buf[1] = 0; 1551 if(!(control & SER_RTS)) 1552 strcat(stat_buf, "|RTS"); 1553 if(!(status & SER_CTS)) 1554 strcat(stat_buf, "|CTS"); 1555 if(!(control & SER_DTR)) 1556 strcat(stat_buf, "|DTR"); 1557 if(!(status & SER_DSR)) 1558 strcat(stat_buf, "|DSR"); 1559 if(!(status & SER_DCD)) 1560 strcat(stat_buf, "|CD"); 1561 1562 if (state->quot) 1563 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1564 1565 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1566 1567 if (state->icount.frame) 1568 seq_printf(m, " fe:%d", state->icount.frame); 1569 1570 if (state->icount.parity) 1571 seq_printf(m, " pe:%d", state->icount.parity); 1572 1573 if (state->icount.brk) 1574 seq_printf(m, " brk:%d", state->icount.brk); 1575 1576 if (state->icount.overrun) 1577 seq_printf(m, " oe:%d", state->icount.overrun); 1578 1579 /* 1580 * Last thing is the RS-232 status lines 1581 */ 1582 seq_printf(m, " %s\n", stat_buf+1); 1583 } 1584 1585 static int rs_proc_show(struct seq_file *m, void *v) 1586 { 1587 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1588 line_info(m, 0, &rs_table[0]); 1589 return 0; 1590 } 1591 1592 static int rs_proc_open(struct inode *inode, struct file *file) 1593 { 1594 return single_open(file, rs_proc_show, NULL); 1595 } 1596 1597 static const struct file_operations rs_proc_fops = { 1598 .owner = THIS_MODULE, 1599 .open = rs_proc_open, 1600 .read = seq_read, 1601 .llseek = seq_lseek, 1602 .release = single_release, 1603 }; 1604 1605 /* 1606 * --------------------------------------------------------------------- 1607 * rs_init() and friends 1608 * 1609 * rs_init() is called at boot-time to initialize the serial driver. 1610 * --------------------------------------------------------------------- 1611 */ 1612 1613 /* 1614 * This routine prints out the appropriate serial driver version 1615 * number, and identifies which options were configured into this 1616 * driver. 1617 */ 1618 static void show_serial_version(void) 1619 { 1620 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1621 } 1622 1623 1624 static const struct tty_operations serial_ops = { 1625 .open = rs_open, 1626 .close = rs_close, 1627 .write = rs_write, 1628 .put_char = rs_put_char, 1629 .flush_chars = rs_flush_chars, 1630 .write_room = rs_write_room, 1631 .chars_in_buffer = rs_chars_in_buffer, 1632 .flush_buffer = rs_flush_buffer, 1633 .ioctl = rs_ioctl, 1634 .throttle = rs_throttle, 1635 .unthrottle = rs_unthrottle, 1636 .set_termios = rs_set_termios, 1637 .stop = rs_stop, 1638 .start = rs_start, 1639 .hangup = rs_hangup, 1640 .break_ctl = rs_break, 1641 .send_xchar = rs_send_xchar, 1642 .wait_until_sent = rs_wait_until_sent, 1643 .tiocmget = rs_tiocmget, 1644 .tiocmset = rs_tiocmset, 1645 .get_icount = rs_get_icount, 1646 .proc_fops = &rs_proc_fops, 1647 }; 1648 1649 static int amiga_carrier_raised(struct tty_port *port) 1650 { 1651 return !(ciab.pra & SER_DCD); 1652 } 1653 1654 static void amiga_dtr_rts(struct tty_port *port, int raise) 1655 { 1656 struct serial_state *info = container_of(port, struct serial_state, 1657 tport); 1658 unsigned long flags; 1659 1660 if (raise) 1661 info->MCR |= SER_DTR|SER_RTS; 1662 else 1663 info->MCR &= ~(SER_DTR|SER_RTS); 1664 1665 local_irq_save(flags); 1666 rtsdtr_ctrl(info->MCR); 1667 local_irq_restore(flags); 1668 } 1669 1670 static const struct tty_port_operations amiga_port_ops = { 1671 .carrier_raised = amiga_carrier_raised, 1672 .dtr_rts = amiga_dtr_rts, 1673 }; 1674 1675 /* 1676 * The serial driver boot-time initialization code! 1677 */ 1678 static int __init amiga_serial_probe(struct platform_device *pdev) 1679 { 1680 unsigned long flags; 1681 struct serial_state * state; 1682 int error; 1683 1684 serial_driver = alloc_tty_driver(NR_PORTS); 1685 if (!serial_driver) 1686 return -ENOMEM; 1687 1688 show_serial_version(); 1689 1690 /* Initialize the tty_driver structure */ 1691 1692 serial_driver->driver_name = "amiserial"; 1693 serial_driver->name = "ttyS"; 1694 serial_driver->major = TTY_MAJOR; 1695 serial_driver->minor_start = 64; 1696 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1697 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1698 serial_driver->init_termios = tty_std_termios; 1699 serial_driver->init_termios.c_cflag = 1700 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1701 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1702 tty_set_operations(serial_driver, &serial_ops); 1703 1704 state = rs_table; 1705 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1706 state->custom_divisor = 0; 1707 state->icount.cts = state->icount.dsr = 1708 state->icount.rng = state->icount.dcd = 0; 1709 state->icount.rx = state->icount.tx = 0; 1710 state->icount.frame = state->icount.parity = 0; 1711 state->icount.overrun = state->icount.brk = 0; 1712 tty_port_init(&state->tport); 1713 state->tport.ops = &amiga_port_ops; 1714 tty_port_link_device(&state->tport, serial_driver, 0); 1715 1716 error = tty_register_driver(serial_driver); 1717 if (error) 1718 goto fail_put_tty_driver; 1719 1720 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1721 1722 /* Hardware set up */ 1723 1724 state->baud_base = amiga_colorclock; 1725 state->xmit_fifo_size = 1; 1726 1727 /* set ISRs, and then disable the rx interrupts */ 1728 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1729 if (error) 1730 goto fail_unregister; 1731 1732 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1733 "serial RX", state); 1734 if (error) 1735 goto fail_free_irq; 1736 1737 local_irq_save(flags); 1738 1739 /* turn off Rx and Tx interrupts */ 1740 custom.intena = IF_RBF | IF_TBE; 1741 mb(); 1742 1743 /* clear any pending interrupt */ 1744 custom.intreq = IF_RBF | IF_TBE; 1745 mb(); 1746 1747 local_irq_restore(flags); 1748 1749 /* 1750 * set the appropriate directions for the modem control flags, 1751 * and clear RTS and DTR 1752 */ 1753 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1754 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1755 1756 platform_set_drvdata(pdev, state); 1757 1758 return 0; 1759 1760 fail_free_irq: 1761 free_irq(IRQ_AMIGA_TBE, state); 1762 fail_unregister: 1763 tty_unregister_driver(serial_driver); 1764 fail_put_tty_driver: 1765 tty_port_destroy(&state->tport); 1766 put_tty_driver(serial_driver); 1767 return error; 1768 } 1769 1770 static int __exit amiga_serial_remove(struct platform_device *pdev) 1771 { 1772 int error; 1773 struct serial_state *state = platform_get_drvdata(pdev); 1774 1775 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1776 error = tty_unregister_driver(serial_driver); 1777 if (error) 1778 printk("SERIAL: failed to unregister serial driver (%d)\n", 1779 error); 1780 put_tty_driver(serial_driver); 1781 tty_port_destroy(&state->tport); 1782 1783 free_irq(IRQ_AMIGA_TBE, state); 1784 free_irq(IRQ_AMIGA_RBF, state); 1785 1786 return error; 1787 } 1788 1789 static struct platform_driver amiga_serial_driver = { 1790 .remove = __exit_p(amiga_serial_remove), 1791 .driver = { 1792 .name = "amiga-serial", 1793 }, 1794 }; 1795 1796 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1797 1798 1799 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1800 1801 /* 1802 * ------------------------------------------------------------ 1803 * Serial console driver 1804 * ------------------------------------------------------------ 1805 */ 1806 1807 static void amiga_serial_putc(char c) 1808 { 1809 custom.serdat = (unsigned char)c | 0x100; 1810 while (!(custom.serdatr & 0x2000)) 1811 barrier(); 1812 } 1813 1814 /* 1815 * Print a string to the serial port trying not to disturb 1816 * any possible real use of the port... 1817 * 1818 * The console must be locked when we get here. 1819 */ 1820 static void serial_console_write(struct console *co, const char *s, 1821 unsigned count) 1822 { 1823 unsigned short intena = custom.intenar; 1824 1825 custom.intena = IF_TBE; 1826 1827 while (count--) { 1828 if (*s == '\n') 1829 amiga_serial_putc('\r'); 1830 amiga_serial_putc(*s++); 1831 } 1832 1833 custom.intena = IF_SETCLR | (intena & IF_TBE); 1834 } 1835 1836 static struct tty_driver *serial_console_device(struct console *c, int *index) 1837 { 1838 *index = 0; 1839 return serial_driver; 1840 } 1841 1842 static struct console sercons = { 1843 .name = "ttyS", 1844 .write = serial_console_write, 1845 .device = serial_console_device, 1846 .flags = CON_PRINTBUFFER, 1847 .index = -1, 1848 }; 1849 1850 /* 1851 * Register console. 1852 */ 1853 static int __init amiserial_console_init(void) 1854 { 1855 if (!MACH_IS_AMIGA) 1856 return -ENODEV; 1857 1858 register_console(&sercons); 1859 return 0; 1860 } 1861 console_initcall(amiserial_console_init); 1862 1863 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1864 1865 MODULE_LICENSE("GPL"); 1866 MODULE_ALIAS("platform:amiga-serial"); 1867