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 #define SERIAL_DO_RESTART 36 37 /* Set of debugging defines */ 38 39 #undef SERIAL_DEBUG_INTR 40 #undef SERIAL_DEBUG_OPEN 41 #undef SERIAL_DEBUG_FLOW 42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 43 44 /* Sanity checks */ 45 46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) 47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ 48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) 49 #else 50 #define DBG_CNT(s) 51 #endif 52 53 /* 54 * End of serial driver configuration section. 55 */ 56 57 #include <linux/module.h> 58 59 #include <linux/types.h> 60 #include <linux/serial.h> 61 #include <linux/serial_reg.h> 62 static char *serial_version = "4.30"; 63 64 #include <linux/errno.h> 65 #include <linux/signal.h> 66 #include <linux/sched.h> 67 #include <linux/kernel.h> 68 #include <linux/timer.h> 69 #include <linux/interrupt.h> 70 #include <linux/tty.h> 71 #include <linux/tty_flip.h> 72 #include <linux/circ_buf.h> 73 #include <linux/console.h> 74 #include <linux/major.h> 75 #include <linux/string.h> 76 #include <linux/fcntl.h> 77 #include <linux/ptrace.h> 78 #include <linux/ioport.h> 79 #include <linux/mm.h> 80 #include <linux/seq_file.h> 81 #include <linux/slab.h> 82 #include <linux/init.h> 83 #include <linux/bitops.h> 84 #include <linux/platform_device.h> 85 86 #include <asm/setup.h> 87 88 89 #include <asm/irq.h> 90 91 #include <asm/amigahw.h> 92 #include <asm/amigaints.h> 93 94 struct serial_state { 95 struct tty_port tport; 96 struct circ_buf xmit; 97 struct async_icount icount; 98 99 unsigned long port; 100 int baud_base; 101 int xmit_fifo_size; 102 int custom_divisor; 103 int read_status_mask; 104 int ignore_status_mask; 105 int timeout; 106 int quot; 107 int IER; /* Interrupt Enable Register */ 108 int MCR; /* Modem control register */ 109 int x_char; /* xon/xoff character */ 110 }; 111 112 #define custom amiga_custom 113 static char *serial_name = "Amiga-builtin serial driver"; 114 115 static struct tty_driver *serial_driver; 116 117 /* number of characters left in xmit buffer before we ask for more */ 118 #define WAKEUP_CHARS 256 119 120 static unsigned char current_ctl_bits; 121 122 static void change_speed(struct tty_struct *tty, struct serial_state *info, 123 struct ktermios *old); 124 static void rs_wait_until_sent(struct tty_struct *tty, int timeout); 125 126 127 static struct serial_state rs_table[1]; 128 129 #define NR_PORTS ARRAY_SIZE(rs_table) 130 131 #include <asm/uaccess.h> 132 133 #define serial_isroot() (capable(CAP_SYS_ADMIN)) 134 135 136 static inline int serial_paranoia_check(struct serial_state *info, 137 char *name, const char *routine) 138 { 139 #ifdef SERIAL_PARANOIA_CHECK 140 static const char *badmagic = 141 "Warning: bad magic number for serial struct (%s) in %s\n"; 142 static const char *badinfo = 143 "Warning: null async_struct for (%s) in %s\n"; 144 145 if (!info) { 146 printk(badinfo, name, routine); 147 return 1; 148 } 149 if (info->magic != SERIAL_MAGIC) { 150 printk(badmagic, name, routine); 151 return 1; 152 } 153 #endif 154 return 0; 155 } 156 157 /* some serial hardware definitions */ 158 #define SDR_OVRUN (1<<15) 159 #define SDR_RBF (1<<14) 160 #define SDR_TBE (1<<13) 161 #define SDR_TSRE (1<<12) 162 163 #define SERPER_PARENB (1<<15) 164 165 #define AC_SETCLR (1<<15) 166 #define AC_UARTBRK (1<<11) 167 168 #define SER_DTR (1<<7) 169 #define SER_RTS (1<<6) 170 #define SER_DCD (1<<5) 171 #define SER_CTS (1<<4) 172 #define SER_DSR (1<<3) 173 174 static __inline__ void rtsdtr_ctrl(int bits) 175 { 176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); 177 } 178 179 /* 180 * ------------------------------------------------------------ 181 * rs_stop() and rs_start() 182 * 183 * This routines are called before setting or resetting tty->stopped. 184 * They enable or disable transmitter interrupts, as necessary. 185 * ------------------------------------------------------------ 186 */ 187 static void rs_stop(struct tty_struct *tty) 188 { 189 struct serial_state *info = tty->driver_data; 190 unsigned long flags; 191 192 if (serial_paranoia_check(info, tty->name, "rs_stop")) 193 return; 194 195 local_irq_save(flags); 196 if (info->IER & UART_IER_THRI) { 197 info->IER &= ~UART_IER_THRI; 198 /* disable Tx interrupt and remove any pending interrupts */ 199 custom.intena = IF_TBE; 200 mb(); 201 custom.intreq = IF_TBE; 202 mb(); 203 } 204 local_irq_restore(flags); 205 } 206 207 static void rs_start(struct tty_struct *tty) 208 { 209 struct serial_state *info = tty->driver_data; 210 unsigned long flags; 211 212 if (serial_paranoia_check(info, tty->name, "rs_start")) 213 return; 214 215 local_irq_save(flags); 216 if (info->xmit.head != info->xmit.tail 217 && info->xmit.buf 218 && !(info->IER & UART_IER_THRI)) { 219 info->IER |= UART_IER_THRI; 220 custom.intena = IF_SETCLR | IF_TBE; 221 mb(); 222 /* set a pending Tx Interrupt, transmitter should restart now */ 223 custom.intreq = IF_SETCLR | IF_TBE; 224 mb(); 225 } 226 local_irq_restore(flags); 227 } 228 229 /* 230 * ---------------------------------------------------------------------- 231 * 232 * Here starts the interrupt handling routines. All of the following 233 * subroutines are declared as inline and are folded into 234 * rs_interrupt(). They were separated out for readability's sake. 235 * 236 * Note: rs_interrupt() is a "fast" interrupt, which means that it 237 * runs with interrupts turned off. People who may want to modify 238 * rs_interrupt() should try to keep the interrupt handler as fast as 239 * possible. After you are done making modifications, it is not a bad 240 * idea to do: 241 * 242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c 243 * 244 * and look at the resulting assemble code in serial.s. 245 * 246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 247 * ----------------------------------------------------------------------- 248 */ 249 250 static void receive_chars(struct serial_state *info) 251 { 252 int status; 253 int serdatr; 254 unsigned char ch, flag; 255 struct async_icount *icount; 256 int oe = 0; 257 258 icount = &info->icount; 259 260 status = UART_LSR_DR; /* We obviously have a character! */ 261 serdatr = custom.serdatr; 262 mb(); 263 custom.intreq = IF_RBF; 264 mb(); 265 266 if((serdatr & 0x1ff) == 0) 267 status |= UART_LSR_BI; 268 if(serdatr & SDR_OVRUN) 269 status |= UART_LSR_OE; 270 271 ch = serdatr & 0xff; 272 icount->rx++; 273 274 #ifdef SERIAL_DEBUG_INTR 275 printk("DR%02x:%02x...", ch, status); 276 #endif 277 flag = TTY_NORMAL; 278 279 /* 280 * We don't handle parity or frame errors - but I have left 281 * the code in, since I'm not sure that the errors can't be 282 * detected. 283 */ 284 285 if (status & (UART_LSR_BI | UART_LSR_PE | 286 UART_LSR_FE | UART_LSR_OE)) { 287 /* 288 * For statistics only 289 */ 290 if (status & UART_LSR_BI) { 291 status &= ~(UART_LSR_FE | UART_LSR_PE); 292 icount->brk++; 293 } else if (status & UART_LSR_PE) 294 icount->parity++; 295 else if (status & UART_LSR_FE) 296 icount->frame++; 297 if (status & UART_LSR_OE) 298 icount->overrun++; 299 300 /* 301 * Now check to see if character should be 302 * ignored, and mask off conditions which 303 * should be ignored. 304 */ 305 if (status & info->ignore_status_mask) 306 goto out; 307 308 status &= info->read_status_mask; 309 310 if (status & (UART_LSR_BI)) { 311 #ifdef SERIAL_DEBUG_INTR 312 printk("handling break...."); 313 #endif 314 flag = TTY_BREAK; 315 if (info->tport.flags & ASYNC_SAK) 316 do_SAK(info->tport.tty); 317 } else if (status & UART_LSR_PE) 318 flag = TTY_PARITY; 319 else if (status & UART_LSR_FE) 320 flag = TTY_FRAME; 321 if (status & UART_LSR_OE) { 322 /* 323 * Overrun is special, since it's 324 * reported immediately, and doesn't 325 * affect the current character 326 */ 327 oe = 1; 328 } 329 } 330 tty_insert_flip_char(&info->tport, ch, flag); 331 if (oe == 1) 332 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); 333 tty_flip_buffer_push(&info->tport); 334 out: 335 return; 336 } 337 338 static void transmit_chars(struct serial_state *info) 339 { 340 custom.intreq = IF_TBE; 341 mb(); 342 if (info->x_char) { 343 custom.serdat = info->x_char | 0x100; 344 mb(); 345 info->icount.tx++; 346 info->x_char = 0; 347 return; 348 } 349 if (info->xmit.head == info->xmit.tail 350 || info->tport.tty->stopped 351 || info->tport.tty->hw_stopped) { 352 info->IER &= ~UART_IER_THRI; 353 custom.intena = IF_TBE; 354 mb(); 355 return; 356 } 357 358 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; 359 mb(); 360 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); 361 info->icount.tx++; 362 363 if (CIRC_CNT(info->xmit.head, 364 info->xmit.tail, 365 SERIAL_XMIT_SIZE) < WAKEUP_CHARS) 366 tty_wakeup(info->tport.tty); 367 368 #ifdef SERIAL_DEBUG_INTR 369 printk("THRE..."); 370 #endif 371 if (info->xmit.head == info->xmit.tail) { 372 custom.intena = IF_TBE; 373 mb(); 374 info->IER &= ~UART_IER_THRI; 375 } 376 } 377 378 static void check_modem_status(struct serial_state *info) 379 { 380 struct tty_port *port = &info->tport; 381 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 382 unsigned char dstatus; 383 struct async_icount *icount; 384 385 /* Determine bits that have changed */ 386 dstatus = status ^ current_ctl_bits; 387 current_ctl_bits = status; 388 389 if (dstatus) { 390 icount = &info->icount; 391 /* update input line counters */ 392 if (dstatus & SER_DSR) 393 icount->dsr++; 394 if (dstatus & SER_DCD) { 395 icount->dcd++; 396 } 397 if (dstatus & SER_CTS) 398 icount->cts++; 399 wake_up_interruptible(&port->delta_msr_wait); 400 } 401 402 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { 403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) 404 printk("ttyS%d CD now %s...", info->line, 405 (!(status & SER_DCD)) ? "on" : "off"); 406 #endif 407 if (!(status & SER_DCD)) 408 wake_up_interruptible(&port->open_wait); 409 else { 410 #ifdef SERIAL_DEBUG_OPEN 411 printk("doing serial hangup..."); 412 #endif 413 if (port->tty) 414 tty_hangup(port->tty); 415 } 416 } 417 if (tty_port_cts_enabled(port)) { 418 if (port->tty->hw_stopped) { 419 if (!(status & SER_CTS)) { 420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 421 printk("CTS tx start..."); 422 #endif 423 port->tty->hw_stopped = 0; 424 info->IER |= UART_IER_THRI; 425 custom.intena = IF_SETCLR | IF_TBE; 426 mb(); 427 /* set a pending Tx Interrupt, transmitter should restart now */ 428 custom.intreq = IF_SETCLR | IF_TBE; 429 mb(); 430 tty_wakeup(port->tty); 431 return; 432 } 433 } else { 434 if ((status & SER_CTS)) { 435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 436 printk("CTS tx stop..."); 437 #endif 438 port->tty->hw_stopped = 1; 439 info->IER &= ~UART_IER_THRI; 440 /* disable Tx interrupt and remove any pending interrupts */ 441 custom.intena = IF_TBE; 442 mb(); 443 custom.intreq = IF_TBE; 444 mb(); 445 } 446 } 447 } 448 } 449 450 static irqreturn_t ser_vbl_int( int irq, void *data) 451 { 452 /* vbl is just a periodic interrupt we tie into to update modem status */ 453 struct serial_state *info = data; 454 /* 455 * TBD - is it better to unregister from this interrupt or to 456 * ignore it if MSI is clear ? 457 */ 458 if(info->IER & UART_IER_MSI) 459 check_modem_status(info); 460 return IRQ_HANDLED; 461 } 462 463 static irqreturn_t ser_rx_int(int irq, void *dev_id) 464 { 465 struct serial_state *info = dev_id; 466 467 #ifdef SERIAL_DEBUG_INTR 468 printk("ser_rx_int..."); 469 #endif 470 471 if (!info->tport.tty) 472 return IRQ_NONE; 473 474 receive_chars(info); 475 #ifdef SERIAL_DEBUG_INTR 476 printk("end.\n"); 477 #endif 478 return IRQ_HANDLED; 479 } 480 481 static irqreturn_t ser_tx_int(int irq, void *dev_id) 482 { 483 struct serial_state *info = dev_id; 484 485 if (custom.serdatr & SDR_TBE) { 486 #ifdef SERIAL_DEBUG_INTR 487 printk("ser_tx_int..."); 488 #endif 489 490 if (!info->tport.tty) 491 return IRQ_NONE; 492 493 transmit_chars(info); 494 #ifdef SERIAL_DEBUG_INTR 495 printk("end.\n"); 496 #endif 497 } 498 return IRQ_HANDLED; 499 } 500 501 /* 502 * ------------------------------------------------------------------- 503 * Here ends the serial interrupt routines. 504 * ------------------------------------------------------------------- 505 */ 506 507 /* 508 * --------------------------------------------------------------- 509 * Low level utility subroutines for the serial driver: routines to 510 * figure out the appropriate timeout for an interrupt chain, routines 511 * to initialize and startup a serial port, and routines to shutdown a 512 * serial port. Useful stuff like that. 513 * --------------------------------------------------------------- 514 */ 515 516 static int startup(struct tty_struct *tty, struct serial_state *info) 517 { 518 struct tty_port *port = &info->tport; 519 unsigned long flags; 520 int retval=0; 521 unsigned long page; 522 523 page = get_zeroed_page(GFP_KERNEL); 524 if (!page) 525 return -ENOMEM; 526 527 local_irq_save(flags); 528 529 if (port->flags & ASYNC_INITIALIZED) { 530 free_page(page); 531 goto errout; 532 } 533 534 if (info->xmit.buf) 535 free_page(page); 536 else 537 info->xmit.buf = (unsigned char *) page; 538 539 #ifdef SERIAL_DEBUG_OPEN 540 printk("starting up ttys%d ...", info->line); 541 #endif 542 543 /* Clear anything in the input buffer */ 544 545 custom.intreq = IF_RBF; 546 mb(); 547 548 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); 549 if (retval) { 550 if (serial_isroot()) { 551 set_bit(TTY_IO_ERROR, &tty->flags); 552 retval = 0; 553 } 554 goto errout; 555 } 556 557 /* enable both Rx and Tx interrupts */ 558 custom.intena = IF_SETCLR | IF_RBF | IF_TBE; 559 mb(); 560 info->IER = UART_IER_MSI; 561 562 /* remember current state of the DCD and CTS bits */ 563 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 564 565 info->MCR = 0; 566 if (C_BAUD(tty)) 567 info->MCR = SER_DTR | SER_RTS; 568 rtsdtr_ctrl(info->MCR); 569 570 clear_bit(TTY_IO_ERROR, &tty->flags); 571 info->xmit.head = info->xmit.tail = 0; 572 573 /* 574 * Set up the tty->alt_speed kludge 575 */ 576 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 577 tty->alt_speed = 57600; 578 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 579 tty->alt_speed = 115200; 580 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 581 tty->alt_speed = 230400; 582 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 583 tty->alt_speed = 460800; 584 585 /* 586 * and set the speed of the serial port 587 */ 588 change_speed(tty, info, NULL); 589 590 port->flags |= ASYNC_INITIALIZED; 591 local_irq_restore(flags); 592 return 0; 593 594 errout: 595 local_irq_restore(flags); 596 return retval; 597 } 598 599 /* 600 * This routine will shutdown a serial port; interrupts are disabled, and 601 * DTR is dropped if the hangup on close termio flag is on. 602 */ 603 static void shutdown(struct tty_struct *tty, struct serial_state *info) 604 { 605 unsigned long flags; 606 struct serial_state *state; 607 608 if (!(info->tport.flags & ASYNC_INITIALIZED)) 609 return; 610 611 state = info; 612 613 #ifdef SERIAL_DEBUG_OPEN 614 printk("Shutting down serial port %d ....\n", info->line); 615 #endif 616 617 local_irq_save(flags); /* Disable interrupts */ 618 619 /* 620 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 621 * here so the queue might never be waken up 622 */ 623 wake_up_interruptible(&info->tport.delta_msr_wait); 624 625 /* 626 * Free the IRQ, if necessary 627 */ 628 free_irq(IRQ_AMIGA_VERTB, info); 629 630 if (info->xmit.buf) { 631 free_page((unsigned long) info->xmit.buf); 632 info->xmit.buf = NULL; 633 } 634 635 info->IER = 0; 636 custom.intena = IF_RBF | IF_TBE; 637 mb(); 638 639 /* disable break condition */ 640 custom.adkcon = AC_UARTBRK; 641 mb(); 642 643 if (tty->termios.c_cflag & HUPCL) 644 info->MCR &= ~(SER_DTR|SER_RTS); 645 rtsdtr_ctrl(info->MCR); 646 647 set_bit(TTY_IO_ERROR, &tty->flags); 648 649 info->tport.flags &= ~ASYNC_INITIALIZED; 650 local_irq_restore(flags); 651 } 652 653 654 /* 655 * This routine is called to set the UART divisor registers to match 656 * the specified baud rate for a serial port. 657 */ 658 static void change_speed(struct tty_struct *tty, struct serial_state *info, 659 struct ktermios *old_termios) 660 { 661 struct tty_port *port = &info->tport; 662 int quot = 0, baud_base, baud; 663 unsigned cflag, cval = 0; 664 int bits; 665 unsigned long flags; 666 667 cflag = tty->termios.c_cflag; 668 669 /* Byte size is always 8 bits plus parity bit if requested */ 670 671 cval = 3; bits = 10; 672 if (cflag & CSTOPB) { 673 cval |= 0x04; 674 bits++; 675 } 676 if (cflag & PARENB) { 677 cval |= UART_LCR_PARITY; 678 bits++; 679 } 680 if (!(cflag & PARODD)) 681 cval |= UART_LCR_EPAR; 682 #ifdef CMSPAR 683 if (cflag & CMSPAR) 684 cval |= UART_LCR_SPAR; 685 #endif 686 687 /* Determine divisor based on baud rate */ 688 baud = tty_get_baud_rate(tty); 689 if (!baud) 690 baud = 9600; /* B0 transition handled in rs_set_termios */ 691 baud_base = info->baud_base; 692 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 693 quot = info->custom_divisor; 694 else { 695 if (baud == 134) 696 /* Special case since 134 is really 134.5 */ 697 quot = (2*baud_base / 269); 698 else if (baud) 699 quot = baud_base / baud; 700 } 701 /* If the quotient is zero refuse the change */ 702 if (!quot && old_termios) { 703 /* FIXME: Will need updating for new tty in the end */ 704 tty->termios.c_cflag &= ~CBAUD; 705 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 706 baud = tty_get_baud_rate(tty); 707 if (!baud) 708 baud = 9600; 709 if (baud == 38400 && 710 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 711 quot = info->custom_divisor; 712 else { 713 if (baud == 134) 714 /* Special case since 134 is really 134.5 */ 715 quot = (2*baud_base / 269); 716 else if (baud) 717 quot = baud_base / baud; 718 } 719 } 720 /* As a last resort, if the quotient is zero, default to 9600 bps */ 721 if (!quot) 722 quot = baud_base / 9600; 723 info->quot = quot; 724 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); 725 info->timeout += HZ/50; /* Add .02 seconds of slop */ 726 727 /* CTS flow control flag and modem status interrupts */ 728 info->IER &= ~UART_IER_MSI; 729 if (port->flags & ASYNC_HARDPPS_CD) 730 info->IER |= UART_IER_MSI; 731 if (cflag & CRTSCTS) { 732 port->flags |= ASYNC_CTS_FLOW; 733 info->IER |= UART_IER_MSI; 734 } else 735 port->flags &= ~ASYNC_CTS_FLOW; 736 if (cflag & CLOCAL) 737 port->flags &= ~ASYNC_CHECK_CD; 738 else { 739 port->flags |= ASYNC_CHECK_CD; 740 info->IER |= UART_IER_MSI; 741 } 742 /* TBD: 743 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 744 */ 745 746 /* 747 * Set up parity check flag 748 */ 749 750 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 751 if (I_INPCK(tty)) 752 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 753 if (I_BRKINT(tty) || I_PARMRK(tty)) 754 info->read_status_mask |= UART_LSR_BI; 755 756 /* 757 * Characters to ignore 758 */ 759 info->ignore_status_mask = 0; 760 if (I_IGNPAR(tty)) 761 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 762 if (I_IGNBRK(tty)) { 763 info->ignore_status_mask |= UART_LSR_BI; 764 /* 765 * If we're ignore parity and break indicators, ignore 766 * overruns too. (For real raw support). 767 */ 768 if (I_IGNPAR(tty)) 769 info->ignore_status_mask |= UART_LSR_OE; 770 } 771 /* 772 * !!! ignore all characters if CREAD is not set 773 */ 774 if ((cflag & CREAD) == 0) 775 info->ignore_status_mask |= UART_LSR_DR; 776 local_irq_save(flags); 777 778 { 779 short serper; 780 781 /* Set up the baud rate */ 782 serper = quot - 1; 783 784 /* Enable or disable parity bit */ 785 786 if(cval & UART_LCR_PARITY) 787 serper |= (SERPER_PARENB); 788 789 custom.serper = serper; 790 mb(); 791 } 792 793 local_irq_restore(flags); 794 } 795 796 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 797 { 798 struct serial_state *info; 799 unsigned long flags; 800 801 info = tty->driver_data; 802 803 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 804 return 0; 805 806 if (!info->xmit.buf) 807 return 0; 808 809 local_irq_save(flags); 810 if (CIRC_SPACE(info->xmit.head, 811 info->xmit.tail, 812 SERIAL_XMIT_SIZE) == 0) { 813 local_irq_restore(flags); 814 return 0; 815 } 816 817 info->xmit.buf[info->xmit.head++] = ch; 818 info->xmit.head &= SERIAL_XMIT_SIZE-1; 819 local_irq_restore(flags); 820 return 1; 821 } 822 823 static void rs_flush_chars(struct tty_struct *tty) 824 { 825 struct serial_state *info = tty->driver_data; 826 unsigned long flags; 827 828 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 829 return; 830 831 if (info->xmit.head == info->xmit.tail 832 || tty->stopped 833 || tty->hw_stopped 834 || !info->xmit.buf) 835 return; 836 837 local_irq_save(flags); 838 info->IER |= UART_IER_THRI; 839 custom.intena = IF_SETCLR | IF_TBE; 840 mb(); 841 /* set a pending Tx Interrupt, transmitter should restart now */ 842 custom.intreq = IF_SETCLR | IF_TBE; 843 mb(); 844 local_irq_restore(flags); 845 } 846 847 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 848 { 849 int c, ret = 0; 850 struct serial_state *info = tty->driver_data; 851 unsigned long flags; 852 853 if (serial_paranoia_check(info, tty->name, "rs_write")) 854 return 0; 855 856 if (!info->xmit.buf) 857 return 0; 858 859 local_irq_save(flags); 860 while (1) { 861 c = CIRC_SPACE_TO_END(info->xmit.head, 862 info->xmit.tail, 863 SERIAL_XMIT_SIZE); 864 if (count < c) 865 c = count; 866 if (c <= 0) { 867 break; 868 } 869 memcpy(info->xmit.buf + info->xmit.head, buf, c); 870 info->xmit.head = ((info->xmit.head + c) & 871 (SERIAL_XMIT_SIZE-1)); 872 buf += c; 873 count -= c; 874 ret += c; 875 } 876 local_irq_restore(flags); 877 878 if (info->xmit.head != info->xmit.tail 879 && !tty->stopped 880 && !tty->hw_stopped 881 && !(info->IER & UART_IER_THRI)) { 882 info->IER |= UART_IER_THRI; 883 local_irq_disable(); 884 custom.intena = IF_SETCLR | IF_TBE; 885 mb(); 886 /* set a pending Tx Interrupt, transmitter should restart now */ 887 custom.intreq = IF_SETCLR | IF_TBE; 888 mb(); 889 local_irq_restore(flags); 890 } 891 return ret; 892 } 893 894 static int rs_write_room(struct tty_struct *tty) 895 { 896 struct serial_state *info = tty->driver_data; 897 898 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 899 return 0; 900 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 901 } 902 903 static int rs_chars_in_buffer(struct tty_struct *tty) 904 { 905 struct serial_state *info = tty->driver_data; 906 907 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 908 return 0; 909 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 910 } 911 912 static void rs_flush_buffer(struct tty_struct *tty) 913 { 914 struct serial_state *info = tty->driver_data; 915 unsigned long flags; 916 917 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 918 return; 919 local_irq_save(flags); 920 info->xmit.head = info->xmit.tail = 0; 921 local_irq_restore(flags); 922 tty_wakeup(tty); 923 } 924 925 /* 926 * This function is used to send a high-priority XON/XOFF character to 927 * the device 928 */ 929 static void rs_send_xchar(struct tty_struct *tty, char ch) 930 { 931 struct serial_state *info = tty->driver_data; 932 unsigned long flags; 933 934 if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) 935 return; 936 937 info->x_char = ch; 938 if (ch) { 939 /* Make sure transmit interrupts are on */ 940 941 /* Check this ! */ 942 local_irq_save(flags); 943 if(!(custom.intenar & IF_TBE)) { 944 custom.intena = IF_SETCLR | IF_TBE; 945 mb(); 946 /* set a pending Tx Interrupt, transmitter should restart now */ 947 custom.intreq = IF_SETCLR | IF_TBE; 948 mb(); 949 } 950 local_irq_restore(flags); 951 952 info->IER |= UART_IER_THRI; 953 } 954 } 955 956 /* 957 * ------------------------------------------------------------ 958 * rs_throttle() 959 * 960 * This routine is called by the upper-layer tty layer to signal that 961 * incoming characters should be throttled. 962 * ------------------------------------------------------------ 963 */ 964 static void rs_throttle(struct tty_struct * tty) 965 { 966 struct serial_state *info = tty->driver_data; 967 unsigned long flags; 968 #ifdef SERIAL_DEBUG_THROTTLE 969 printk("throttle %s: %d....\n", tty_name(tty), 970 tty->ldisc.chars_in_buffer(tty)); 971 #endif 972 973 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 974 return; 975 976 if (I_IXOFF(tty)) 977 rs_send_xchar(tty, STOP_CHAR(tty)); 978 979 if (tty->termios.c_cflag & CRTSCTS) 980 info->MCR &= ~SER_RTS; 981 982 local_irq_save(flags); 983 rtsdtr_ctrl(info->MCR); 984 local_irq_restore(flags); 985 } 986 987 static void rs_unthrottle(struct tty_struct * tty) 988 { 989 struct serial_state *info = tty->driver_data; 990 unsigned long flags; 991 #ifdef SERIAL_DEBUG_THROTTLE 992 printk("unthrottle %s: %d....\n", tty_name(tty), 993 tty->ldisc.chars_in_buffer(tty)); 994 #endif 995 996 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 997 return; 998 999 if (I_IXOFF(tty)) { 1000 if (info->x_char) 1001 info->x_char = 0; 1002 else 1003 rs_send_xchar(tty, START_CHAR(tty)); 1004 } 1005 if (tty->termios.c_cflag & CRTSCTS) 1006 info->MCR |= SER_RTS; 1007 local_irq_save(flags); 1008 rtsdtr_ctrl(info->MCR); 1009 local_irq_restore(flags); 1010 } 1011 1012 /* 1013 * ------------------------------------------------------------ 1014 * rs_ioctl() and friends 1015 * ------------------------------------------------------------ 1016 */ 1017 1018 static int get_serial_info(struct tty_struct *tty, struct serial_state *state, 1019 struct serial_struct __user * retinfo) 1020 { 1021 struct serial_struct tmp; 1022 1023 if (!retinfo) 1024 return -EFAULT; 1025 memset(&tmp, 0, sizeof(tmp)); 1026 tty_lock(tty); 1027 tmp.line = tty->index; 1028 tmp.port = state->port; 1029 tmp.flags = state->tport.flags; 1030 tmp.xmit_fifo_size = state->xmit_fifo_size; 1031 tmp.baud_base = state->baud_base; 1032 tmp.close_delay = state->tport.close_delay; 1033 tmp.closing_wait = state->tport.closing_wait; 1034 tmp.custom_divisor = state->custom_divisor; 1035 tty_unlock(tty); 1036 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) 1037 return -EFAULT; 1038 return 0; 1039 } 1040 1041 static int set_serial_info(struct tty_struct *tty, struct serial_state *state, 1042 struct serial_struct __user * new_info) 1043 { 1044 struct tty_port *port = &state->tport; 1045 struct serial_struct new_serial; 1046 bool change_spd; 1047 int retval = 0; 1048 1049 if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) 1050 return -EFAULT; 1051 1052 tty_lock(tty); 1053 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || 1054 new_serial.custom_divisor != state->custom_divisor; 1055 if (new_serial.irq || new_serial.port != state->port || 1056 new_serial.xmit_fifo_size != state->xmit_fifo_size) { 1057 tty_unlock(tty); 1058 return -EINVAL; 1059 } 1060 1061 if (!serial_isroot()) { 1062 if ((new_serial.baud_base != state->baud_base) || 1063 (new_serial.close_delay != port->close_delay) || 1064 (new_serial.xmit_fifo_size != state->xmit_fifo_size) || 1065 ((new_serial.flags & ~ASYNC_USR_MASK) != 1066 (port->flags & ~ASYNC_USR_MASK))) { 1067 tty_unlock(tty); 1068 return -EPERM; 1069 } 1070 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1071 (new_serial.flags & ASYNC_USR_MASK)); 1072 state->custom_divisor = new_serial.custom_divisor; 1073 goto check_and_exit; 1074 } 1075 1076 if (new_serial.baud_base < 9600) { 1077 tty_unlock(tty); 1078 return -EINVAL; 1079 } 1080 1081 /* 1082 * OK, past this point, all the error checking has been done. 1083 * At this point, we start making changes..... 1084 */ 1085 1086 state->baud_base = new_serial.baud_base; 1087 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1088 (new_serial.flags & ASYNC_FLAGS)); 1089 state->custom_divisor = new_serial.custom_divisor; 1090 port->close_delay = new_serial.close_delay * HZ/100; 1091 port->closing_wait = new_serial.closing_wait * HZ/100; 1092 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1093 1094 check_and_exit: 1095 if (port->flags & ASYNC_INITIALIZED) { 1096 if (change_spd) { 1097 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 1098 tty->alt_speed = 57600; 1099 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 1100 tty->alt_speed = 115200; 1101 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 1102 tty->alt_speed = 230400; 1103 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 1104 tty->alt_speed = 460800; 1105 change_speed(tty, state, NULL); 1106 } 1107 } else 1108 retval = startup(tty, state); 1109 tty_unlock(tty); 1110 return retval; 1111 } 1112 1113 1114 /* 1115 * get_lsr_info - get line status register info 1116 * 1117 * Purpose: Let user call ioctl() to get info when the UART physically 1118 * is emptied. On bus types like RS485, the transmitter must 1119 * release the bus after transmitting. This must be done when 1120 * the transmit shift register is empty, not be done when the 1121 * transmit holding register is empty. This functionality 1122 * allows an RS485 driver to be written in user space. 1123 */ 1124 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1125 { 1126 unsigned char status; 1127 unsigned int result; 1128 unsigned long flags; 1129 1130 local_irq_save(flags); 1131 status = custom.serdatr; 1132 mb(); 1133 local_irq_restore(flags); 1134 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1135 if (copy_to_user(value, &result, sizeof(int))) 1136 return -EFAULT; 1137 return 0; 1138 } 1139 1140 1141 static int rs_tiocmget(struct tty_struct *tty) 1142 { 1143 struct serial_state *info = tty->driver_data; 1144 unsigned char control, status; 1145 unsigned long flags; 1146 1147 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1148 return -ENODEV; 1149 if (tty->flags & (1 << TTY_IO_ERROR)) 1150 return -EIO; 1151 1152 control = info->MCR; 1153 local_irq_save(flags); 1154 status = ciab.pra; 1155 local_irq_restore(flags); 1156 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1157 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1158 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1159 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1160 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1161 } 1162 1163 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1164 unsigned int clear) 1165 { 1166 struct serial_state *info = tty->driver_data; 1167 unsigned long flags; 1168 1169 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1170 return -ENODEV; 1171 if (tty->flags & (1 << TTY_IO_ERROR)) 1172 return -EIO; 1173 1174 local_irq_save(flags); 1175 if (set & TIOCM_RTS) 1176 info->MCR |= SER_RTS; 1177 if (set & TIOCM_DTR) 1178 info->MCR |= SER_DTR; 1179 if (clear & TIOCM_RTS) 1180 info->MCR &= ~SER_RTS; 1181 if (clear & TIOCM_DTR) 1182 info->MCR &= ~SER_DTR; 1183 rtsdtr_ctrl(info->MCR); 1184 local_irq_restore(flags); 1185 return 0; 1186 } 1187 1188 /* 1189 * rs_break() --- routine which turns the break handling on or off 1190 */ 1191 static int rs_break(struct tty_struct *tty, int break_state) 1192 { 1193 struct serial_state *info = tty->driver_data; 1194 unsigned long flags; 1195 1196 if (serial_paranoia_check(info, tty->name, "rs_break")) 1197 return -EINVAL; 1198 1199 local_irq_save(flags); 1200 if (break_state == -1) 1201 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1202 else 1203 custom.adkcon = AC_UARTBRK; 1204 mb(); 1205 local_irq_restore(flags); 1206 return 0; 1207 } 1208 1209 /* 1210 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1211 * Return: write counters to the user passed counter struct 1212 * NB: both 1->0 and 0->1 transitions are counted except for 1213 * RI where only 0->1 is counted. 1214 */ 1215 static int rs_get_icount(struct tty_struct *tty, 1216 struct serial_icounter_struct *icount) 1217 { 1218 struct serial_state *info = tty->driver_data; 1219 struct async_icount cnow; 1220 unsigned long flags; 1221 1222 local_irq_save(flags); 1223 cnow = info->icount; 1224 local_irq_restore(flags); 1225 icount->cts = cnow.cts; 1226 icount->dsr = cnow.dsr; 1227 icount->rng = cnow.rng; 1228 icount->dcd = cnow.dcd; 1229 icount->rx = cnow.rx; 1230 icount->tx = cnow.tx; 1231 icount->frame = cnow.frame; 1232 icount->overrun = cnow.overrun; 1233 icount->parity = cnow.parity; 1234 icount->brk = cnow.brk; 1235 icount->buf_overrun = cnow.buf_overrun; 1236 1237 return 0; 1238 } 1239 1240 static int rs_ioctl(struct tty_struct *tty, 1241 unsigned int cmd, unsigned long arg) 1242 { 1243 struct serial_state *info = tty->driver_data; 1244 struct async_icount cprev, cnow; /* kernel counter temps */ 1245 void __user *argp = (void __user *)arg; 1246 unsigned long flags; 1247 DEFINE_WAIT(wait); 1248 int ret; 1249 1250 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1251 return -ENODEV; 1252 1253 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1254 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1255 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1256 if (tty->flags & (1 << TTY_IO_ERROR)) 1257 return -EIO; 1258 } 1259 1260 switch (cmd) { 1261 case TIOCGSERIAL: 1262 return get_serial_info(tty, info, argp); 1263 case TIOCSSERIAL: 1264 return set_serial_info(tty, info, argp); 1265 case TIOCSERCONFIG: 1266 return 0; 1267 1268 case TIOCSERGETLSR: /* Get line status register */ 1269 return get_lsr_info(info, argp); 1270 1271 case TIOCSERGSTRUCT: 1272 if (copy_to_user(argp, 1273 info, sizeof(struct serial_state))) 1274 return -EFAULT; 1275 return 0; 1276 1277 /* 1278 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1279 * - mask passed in arg for lines of interest 1280 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1281 * Caller should use TIOCGICOUNT to see which one it was 1282 */ 1283 case TIOCMIWAIT: 1284 local_irq_save(flags); 1285 /* note the counters on entry */ 1286 cprev = info->icount; 1287 local_irq_restore(flags); 1288 while (1) { 1289 prepare_to_wait(&info->tport.delta_msr_wait, 1290 &wait, TASK_INTERRUPTIBLE); 1291 local_irq_save(flags); 1292 cnow = info->icount; /* atomic copy */ 1293 local_irq_restore(flags); 1294 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1295 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 1296 ret = -EIO; /* no change => error */ 1297 break; 1298 } 1299 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1300 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1301 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1302 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1303 ret = 0; 1304 break; 1305 } 1306 schedule(); 1307 /* see if a signal did it */ 1308 if (signal_pending(current)) { 1309 ret = -ERESTARTSYS; 1310 break; 1311 } 1312 cprev = cnow; 1313 } 1314 finish_wait(&info->tport.delta_msr_wait, &wait); 1315 return ret; 1316 1317 case TIOCSERGWILD: 1318 case TIOCSERSWILD: 1319 /* "setserial -W" is called in Debian boot */ 1320 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1321 return 0; 1322 1323 default: 1324 return -ENOIOCTLCMD; 1325 } 1326 return 0; 1327 } 1328 1329 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1330 { 1331 struct serial_state *info = tty->driver_data; 1332 unsigned long flags; 1333 unsigned int cflag = tty->termios.c_cflag; 1334 1335 change_speed(tty, info, old_termios); 1336 1337 /* Handle transition to B0 status */ 1338 if ((old_termios->c_cflag & CBAUD) && 1339 !(cflag & CBAUD)) { 1340 info->MCR &= ~(SER_DTR|SER_RTS); 1341 local_irq_save(flags); 1342 rtsdtr_ctrl(info->MCR); 1343 local_irq_restore(flags); 1344 } 1345 1346 /* Handle transition away from B0 status */ 1347 if (!(old_termios->c_cflag & CBAUD) && 1348 (cflag & CBAUD)) { 1349 info->MCR |= SER_DTR; 1350 if (!(tty->termios.c_cflag & CRTSCTS) || 1351 !test_bit(TTY_THROTTLED, &tty->flags)) { 1352 info->MCR |= SER_RTS; 1353 } 1354 local_irq_save(flags); 1355 rtsdtr_ctrl(info->MCR); 1356 local_irq_restore(flags); 1357 } 1358 1359 /* Handle turning off CRTSCTS */ 1360 if ((old_termios->c_cflag & CRTSCTS) && 1361 !(tty->termios.c_cflag & CRTSCTS)) { 1362 tty->hw_stopped = 0; 1363 rs_start(tty); 1364 } 1365 1366 #if 0 1367 /* 1368 * No need to wake up processes in open wait, since they 1369 * sample the CLOCAL flag once, and don't recheck it. 1370 * XXX It's not clear whether the current behavior is correct 1371 * or not. Hence, this may change..... 1372 */ 1373 if (!(old_termios->c_cflag & CLOCAL) && 1374 (tty->termios.c_cflag & CLOCAL)) 1375 wake_up_interruptible(&info->open_wait); 1376 #endif 1377 } 1378 1379 /* 1380 * ------------------------------------------------------------ 1381 * rs_close() 1382 * 1383 * This routine is called when the serial port gets closed. First, we 1384 * wait for the last remaining data to be sent. Then, we unlink its 1385 * async structure from the interrupt chain if necessary, and we free 1386 * that IRQ if nothing is left in the chain. 1387 * ------------------------------------------------------------ 1388 */ 1389 static void rs_close(struct tty_struct *tty, struct file * filp) 1390 { 1391 struct serial_state *state = tty->driver_data; 1392 struct tty_port *port = &state->tport; 1393 1394 if (serial_paranoia_check(state, tty->name, "rs_close")) 1395 return; 1396 1397 if (tty_port_close_start(port, tty, filp) == 0) 1398 return; 1399 1400 /* 1401 * At this point we stop accepting input. To do this, we 1402 * disable the receive line status interrupts, and tell the 1403 * interrupt driver to stop checking the data ready bit in the 1404 * line status register. 1405 */ 1406 state->read_status_mask &= ~UART_LSR_DR; 1407 if (port->flags & ASYNC_INITIALIZED) { 1408 /* disable receive interrupts */ 1409 custom.intena = IF_RBF; 1410 mb(); 1411 /* clear any pending receive interrupt */ 1412 custom.intreq = IF_RBF; 1413 mb(); 1414 1415 /* 1416 * Before we drop DTR, make sure the UART transmitter 1417 * has completely drained; this is especially 1418 * important if there is a transmit FIFO! 1419 */ 1420 rs_wait_until_sent(tty, state->timeout); 1421 } 1422 shutdown(tty, state); 1423 rs_flush_buffer(tty); 1424 1425 tty_ldisc_flush(tty); 1426 port->tty = NULL; 1427 1428 tty_port_close_end(port, tty); 1429 } 1430 1431 /* 1432 * rs_wait_until_sent() --- wait until the transmitter is empty 1433 */ 1434 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1435 { 1436 struct serial_state *info = tty->driver_data; 1437 unsigned long orig_jiffies, char_time; 1438 int lsr; 1439 1440 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1441 return; 1442 1443 if (info->xmit_fifo_size == 0) 1444 return; /* Just in case.... */ 1445 1446 orig_jiffies = jiffies; 1447 1448 /* 1449 * Set the check interval to be 1/5 of the estimated time to 1450 * send a single character, and make it at least 1. The check 1451 * interval should also be less than the timeout. 1452 * 1453 * Note: we have to use pretty tight timings here to satisfy 1454 * the NIST-PCTS. 1455 */ 1456 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1457 char_time = char_time / 5; 1458 if (char_time == 0) 1459 char_time = 1; 1460 if (timeout) 1461 char_time = min_t(unsigned long, char_time, timeout); 1462 /* 1463 * If the transmitter hasn't cleared in twice the approximate 1464 * amount of time to send the entire FIFO, it probably won't 1465 * ever clear. This assumes the UART isn't doing flow 1466 * control, which is currently the case. Hence, if it ever 1467 * takes longer than info->timeout, this is probably due to a 1468 * UART bug of some kind. So, we clamp the timeout parameter at 1469 * 2*info->timeout. 1470 */ 1471 if (!timeout || timeout > 2*info->timeout) 1472 timeout = 2*info->timeout; 1473 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1474 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1475 printk("jiff=%lu...", jiffies); 1476 #endif 1477 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1478 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1479 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1480 #endif 1481 msleep_interruptible(jiffies_to_msecs(char_time)); 1482 if (signal_pending(current)) 1483 break; 1484 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1485 break; 1486 } 1487 __set_current_state(TASK_RUNNING); 1488 1489 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1490 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1491 #endif 1492 } 1493 1494 /* 1495 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1496 */ 1497 static void rs_hangup(struct tty_struct *tty) 1498 { 1499 struct serial_state *info = tty->driver_data; 1500 1501 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1502 return; 1503 1504 rs_flush_buffer(tty); 1505 shutdown(tty, info); 1506 info->tport.count = 0; 1507 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; 1508 info->tport.tty = NULL; 1509 wake_up_interruptible(&info->tport.open_wait); 1510 } 1511 1512 /* 1513 * This routine is called whenever a serial port is opened. It 1514 * enables interrupts for a serial port, linking in its async structure into 1515 * the IRQ chain. It also performs the serial-specific 1516 * initialization for the tty structure. 1517 */ 1518 static int rs_open(struct tty_struct *tty, struct file * filp) 1519 { 1520 struct serial_state *info = rs_table + tty->index; 1521 struct tty_port *port = &info->tport; 1522 int retval; 1523 1524 port->count++; 1525 port->tty = tty; 1526 tty->driver_data = info; 1527 tty->port = port; 1528 if (serial_paranoia_check(info, tty->name, "rs_open")) 1529 return -ENODEV; 1530 1531 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1532 1533 retval = startup(tty, info); 1534 if (retval) { 1535 return retval; 1536 } 1537 1538 return tty_port_block_til_ready(port, tty, filp); 1539 } 1540 1541 /* 1542 * /proc fs routines.... 1543 */ 1544 1545 static inline void line_info(struct seq_file *m, int line, 1546 struct serial_state *state) 1547 { 1548 char stat_buf[30], control, status; 1549 unsigned long flags; 1550 1551 seq_printf(m, "%d: uart:amiga_builtin", line); 1552 1553 local_irq_save(flags); 1554 status = ciab.pra; 1555 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status; 1556 local_irq_restore(flags); 1557 1558 stat_buf[0] = 0; 1559 stat_buf[1] = 0; 1560 if(!(control & SER_RTS)) 1561 strcat(stat_buf, "|RTS"); 1562 if(!(status & SER_CTS)) 1563 strcat(stat_buf, "|CTS"); 1564 if(!(control & SER_DTR)) 1565 strcat(stat_buf, "|DTR"); 1566 if(!(status & SER_DSR)) 1567 strcat(stat_buf, "|DSR"); 1568 if(!(status & SER_DCD)) 1569 strcat(stat_buf, "|CD"); 1570 1571 if (state->quot) 1572 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1573 1574 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1575 1576 if (state->icount.frame) 1577 seq_printf(m, " fe:%d", state->icount.frame); 1578 1579 if (state->icount.parity) 1580 seq_printf(m, " pe:%d", state->icount.parity); 1581 1582 if (state->icount.brk) 1583 seq_printf(m, " brk:%d", state->icount.brk); 1584 1585 if (state->icount.overrun) 1586 seq_printf(m, " oe:%d", state->icount.overrun); 1587 1588 /* 1589 * Last thing is the RS-232 status lines 1590 */ 1591 seq_printf(m, " %s\n", stat_buf+1); 1592 } 1593 1594 static int rs_proc_show(struct seq_file *m, void *v) 1595 { 1596 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1597 line_info(m, 0, &rs_table[0]); 1598 return 0; 1599 } 1600 1601 static int rs_proc_open(struct inode *inode, struct file *file) 1602 { 1603 return single_open(file, rs_proc_show, NULL); 1604 } 1605 1606 static const struct file_operations rs_proc_fops = { 1607 .owner = THIS_MODULE, 1608 .open = rs_proc_open, 1609 .read = seq_read, 1610 .llseek = seq_lseek, 1611 .release = single_release, 1612 }; 1613 1614 /* 1615 * --------------------------------------------------------------------- 1616 * rs_init() and friends 1617 * 1618 * rs_init() is called at boot-time to initialize the serial driver. 1619 * --------------------------------------------------------------------- 1620 */ 1621 1622 /* 1623 * This routine prints out the appropriate serial driver version 1624 * number, and identifies which options were configured into this 1625 * driver. 1626 */ 1627 static void show_serial_version(void) 1628 { 1629 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1630 } 1631 1632 1633 static const struct tty_operations serial_ops = { 1634 .open = rs_open, 1635 .close = rs_close, 1636 .write = rs_write, 1637 .put_char = rs_put_char, 1638 .flush_chars = rs_flush_chars, 1639 .write_room = rs_write_room, 1640 .chars_in_buffer = rs_chars_in_buffer, 1641 .flush_buffer = rs_flush_buffer, 1642 .ioctl = rs_ioctl, 1643 .throttle = rs_throttle, 1644 .unthrottle = rs_unthrottle, 1645 .set_termios = rs_set_termios, 1646 .stop = rs_stop, 1647 .start = rs_start, 1648 .hangup = rs_hangup, 1649 .break_ctl = rs_break, 1650 .send_xchar = rs_send_xchar, 1651 .wait_until_sent = rs_wait_until_sent, 1652 .tiocmget = rs_tiocmget, 1653 .tiocmset = rs_tiocmset, 1654 .get_icount = rs_get_icount, 1655 .proc_fops = &rs_proc_fops, 1656 }; 1657 1658 static int amiga_carrier_raised(struct tty_port *port) 1659 { 1660 return !(ciab.pra & SER_DCD); 1661 } 1662 1663 static void amiga_dtr_rts(struct tty_port *port, int raise) 1664 { 1665 struct serial_state *info = container_of(port, struct serial_state, 1666 tport); 1667 unsigned long flags; 1668 1669 if (raise) 1670 info->MCR |= SER_DTR|SER_RTS; 1671 else 1672 info->MCR &= ~(SER_DTR|SER_RTS); 1673 1674 local_irq_save(flags); 1675 rtsdtr_ctrl(info->MCR); 1676 local_irq_restore(flags); 1677 } 1678 1679 static const struct tty_port_operations amiga_port_ops = { 1680 .carrier_raised = amiga_carrier_raised, 1681 .dtr_rts = amiga_dtr_rts, 1682 }; 1683 1684 /* 1685 * The serial driver boot-time initialization code! 1686 */ 1687 static int __init amiga_serial_probe(struct platform_device *pdev) 1688 { 1689 unsigned long flags; 1690 struct serial_state * state; 1691 int error; 1692 1693 serial_driver = alloc_tty_driver(NR_PORTS); 1694 if (!serial_driver) 1695 return -ENOMEM; 1696 1697 show_serial_version(); 1698 1699 /* Initialize the tty_driver structure */ 1700 1701 serial_driver->driver_name = "amiserial"; 1702 serial_driver->name = "ttyS"; 1703 serial_driver->major = TTY_MAJOR; 1704 serial_driver->minor_start = 64; 1705 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1706 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1707 serial_driver->init_termios = tty_std_termios; 1708 serial_driver->init_termios.c_cflag = 1709 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1710 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1711 tty_set_operations(serial_driver, &serial_ops); 1712 1713 state = rs_table; 1714 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1715 state->custom_divisor = 0; 1716 state->icount.cts = state->icount.dsr = 1717 state->icount.rng = state->icount.dcd = 0; 1718 state->icount.rx = state->icount.tx = 0; 1719 state->icount.frame = state->icount.parity = 0; 1720 state->icount.overrun = state->icount.brk = 0; 1721 tty_port_init(&state->tport); 1722 state->tport.ops = &amiga_port_ops; 1723 tty_port_link_device(&state->tport, serial_driver, 0); 1724 1725 error = tty_register_driver(serial_driver); 1726 if (error) 1727 goto fail_put_tty_driver; 1728 1729 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1730 1731 /* Hardware set up */ 1732 1733 state->baud_base = amiga_colorclock; 1734 state->xmit_fifo_size = 1; 1735 1736 /* set ISRs, and then disable the rx interrupts */ 1737 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1738 if (error) 1739 goto fail_unregister; 1740 1741 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1742 "serial RX", state); 1743 if (error) 1744 goto fail_free_irq; 1745 1746 local_irq_save(flags); 1747 1748 /* turn off Rx and Tx interrupts */ 1749 custom.intena = IF_RBF | IF_TBE; 1750 mb(); 1751 1752 /* clear any pending interrupt */ 1753 custom.intreq = IF_RBF | IF_TBE; 1754 mb(); 1755 1756 local_irq_restore(flags); 1757 1758 /* 1759 * set the appropriate directions for the modem control flags, 1760 * and clear RTS and DTR 1761 */ 1762 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1763 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1764 1765 platform_set_drvdata(pdev, state); 1766 1767 return 0; 1768 1769 fail_free_irq: 1770 free_irq(IRQ_AMIGA_TBE, state); 1771 fail_unregister: 1772 tty_unregister_driver(serial_driver); 1773 fail_put_tty_driver: 1774 tty_port_destroy(&state->tport); 1775 put_tty_driver(serial_driver); 1776 return error; 1777 } 1778 1779 static int __exit amiga_serial_remove(struct platform_device *pdev) 1780 { 1781 int error; 1782 struct serial_state *state = platform_get_drvdata(pdev); 1783 1784 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1785 error = tty_unregister_driver(serial_driver); 1786 if (error) 1787 printk("SERIAL: failed to unregister serial driver (%d)\n", 1788 error); 1789 put_tty_driver(serial_driver); 1790 tty_port_destroy(&state->tport); 1791 1792 free_irq(IRQ_AMIGA_TBE, state); 1793 free_irq(IRQ_AMIGA_RBF, state); 1794 1795 return error; 1796 } 1797 1798 static struct platform_driver amiga_serial_driver = { 1799 .remove = __exit_p(amiga_serial_remove), 1800 .driver = { 1801 .name = "amiga-serial", 1802 }, 1803 }; 1804 1805 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1806 1807 1808 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1809 1810 /* 1811 * ------------------------------------------------------------ 1812 * Serial console driver 1813 * ------------------------------------------------------------ 1814 */ 1815 1816 static void amiga_serial_putc(char c) 1817 { 1818 custom.serdat = (unsigned char)c | 0x100; 1819 while (!(custom.serdatr & 0x2000)) 1820 barrier(); 1821 } 1822 1823 /* 1824 * Print a string to the serial port trying not to disturb 1825 * any possible real use of the port... 1826 * 1827 * The console must be locked when we get here. 1828 */ 1829 static void serial_console_write(struct console *co, const char *s, 1830 unsigned count) 1831 { 1832 unsigned short intena = custom.intenar; 1833 1834 custom.intena = IF_TBE; 1835 1836 while (count--) { 1837 if (*s == '\n') 1838 amiga_serial_putc('\r'); 1839 amiga_serial_putc(*s++); 1840 } 1841 1842 custom.intena = IF_SETCLR | (intena & IF_TBE); 1843 } 1844 1845 static struct tty_driver *serial_console_device(struct console *c, int *index) 1846 { 1847 *index = 0; 1848 return serial_driver; 1849 } 1850 1851 static struct console sercons = { 1852 .name = "ttyS", 1853 .write = serial_console_write, 1854 .device = serial_console_device, 1855 .flags = CON_PRINTBUFFER, 1856 .index = -1, 1857 }; 1858 1859 /* 1860 * Register console. 1861 */ 1862 static int __init amiserial_console_init(void) 1863 { 1864 if (!MACH_IS_AMIGA) 1865 return -ENODEV; 1866 1867 register_console(&sercons); 1868 return 0; 1869 } 1870 console_initcall(amiserial_console_init); 1871 1872 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1873 1874 MODULE_LICENSE("GPL"); 1875 MODULE_ALIAS("platform:amiga-serial"); 1876