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