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 <linux/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 * and set the speed of the serial port 574 */ 575 change_speed(tty, info, NULL); 576 577 tty_port_set_initialized(port, 1); 578 local_irq_restore(flags); 579 return 0; 580 581 errout: 582 local_irq_restore(flags); 583 return retval; 584 } 585 586 /* 587 * This routine will shutdown a serial port; interrupts are disabled, and 588 * DTR is dropped if the hangup on close termio flag is on. 589 */ 590 static void shutdown(struct tty_struct *tty, struct serial_state *info) 591 { 592 unsigned long flags; 593 struct serial_state *state; 594 595 if (!tty_port_initialized(&info->tport)) 596 return; 597 598 state = info; 599 600 #ifdef SERIAL_DEBUG_OPEN 601 printk("Shutting down serial port %d ....\n", info->line); 602 #endif 603 604 local_irq_save(flags); /* Disable interrupts */ 605 606 /* 607 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 608 * here so the queue might never be waken up 609 */ 610 wake_up_interruptible(&info->tport.delta_msr_wait); 611 612 /* 613 * Free the IRQ, if necessary 614 */ 615 free_irq(IRQ_AMIGA_VERTB, info); 616 617 if (info->xmit.buf) { 618 free_page((unsigned long) info->xmit.buf); 619 info->xmit.buf = NULL; 620 } 621 622 info->IER = 0; 623 custom.intena = IF_RBF | IF_TBE; 624 mb(); 625 626 /* disable break condition */ 627 custom.adkcon = AC_UARTBRK; 628 mb(); 629 630 if (C_HUPCL(tty)) 631 info->MCR &= ~(SER_DTR|SER_RTS); 632 rtsdtr_ctrl(info->MCR); 633 634 set_bit(TTY_IO_ERROR, &tty->flags); 635 636 tty_port_set_initialized(&info->tport, 0); 637 local_irq_restore(flags); 638 } 639 640 641 /* 642 * This routine is called to set the UART divisor registers to match 643 * the specified baud rate for a serial port. 644 */ 645 static void change_speed(struct tty_struct *tty, struct serial_state *info, 646 struct ktermios *old_termios) 647 { 648 struct tty_port *port = &info->tport; 649 int quot = 0, baud_base, baud; 650 unsigned cflag, cval = 0; 651 int bits; 652 unsigned long flags; 653 654 cflag = tty->termios.c_cflag; 655 656 /* Byte size is always 8 bits plus parity bit if requested */ 657 658 cval = 3; bits = 10; 659 if (cflag & CSTOPB) { 660 cval |= 0x04; 661 bits++; 662 } 663 if (cflag & PARENB) { 664 cval |= UART_LCR_PARITY; 665 bits++; 666 } 667 if (!(cflag & PARODD)) 668 cval |= UART_LCR_EPAR; 669 #ifdef CMSPAR 670 if (cflag & CMSPAR) 671 cval |= UART_LCR_SPAR; 672 #endif 673 674 /* Determine divisor based on baud rate */ 675 baud = tty_get_baud_rate(tty); 676 if (!baud) 677 baud = 9600; /* B0 transition handled in rs_set_termios */ 678 baud_base = info->baud_base; 679 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 680 quot = info->custom_divisor; 681 else { 682 if (baud == 134) 683 /* Special case since 134 is really 134.5 */ 684 quot = (2*baud_base / 269); 685 else if (baud) 686 quot = baud_base / baud; 687 } 688 /* If the quotient is zero refuse the change */ 689 if (!quot && old_termios) { 690 /* FIXME: Will need updating for new tty in the end */ 691 tty->termios.c_cflag &= ~CBAUD; 692 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 693 baud = tty_get_baud_rate(tty); 694 if (!baud) 695 baud = 9600; 696 if (baud == 38400 && 697 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 698 quot = info->custom_divisor; 699 else { 700 if (baud == 134) 701 /* Special case since 134 is really 134.5 */ 702 quot = (2*baud_base / 269); 703 else if (baud) 704 quot = baud_base / baud; 705 } 706 } 707 /* As a last resort, if the quotient is zero, default to 9600 bps */ 708 if (!quot) 709 quot = baud_base / 9600; 710 info->quot = quot; 711 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); 712 info->timeout += HZ/50; /* Add .02 seconds of slop */ 713 714 /* CTS flow control flag and modem status interrupts */ 715 info->IER &= ~UART_IER_MSI; 716 if (port->flags & ASYNC_HARDPPS_CD) 717 info->IER |= UART_IER_MSI; 718 tty_port_set_cts_flow(port, cflag & CRTSCTS); 719 if (cflag & CRTSCTS) 720 info->IER |= UART_IER_MSI; 721 tty_port_set_check_carrier(port, ~cflag & CLOCAL); 722 if (~cflag & CLOCAL) 723 info->IER |= UART_IER_MSI; 724 /* TBD: 725 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 726 */ 727 728 /* 729 * Set up parity check flag 730 */ 731 732 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 733 if (I_INPCK(tty)) 734 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 735 if (I_BRKINT(tty) || I_PARMRK(tty)) 736 info->read_status_mask |= UART_LSR_BI; 737 738 /* 739 * Characters to ignore 740 */ 741 info->ignore_status_mask = 0; 742 if (I_IGNPAR(tty)) 743 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 744 if (I_IGNBRK(tty)) { 745 info->ignore_status_mask |= UART_LSR_BI; 746 /* 747 * If we're ignore parity and break indicators, ignore 748 * overruns too. (For real raw support). 749 */ 750 if (I_IGNPAR(tty)) 751 info->ignore_status_mask |= UART_LSR_OE; 752 } 753 /* 754 * !!! ignore all characters if CREAD is not set 755 */ 756 if ((cflag & CREAD) == 0) 757 info->ignore_status_mask |= UART_LSR_DR; 758 local_irq_save(flags); 759 760 { 761 short serper; 762 763 /* Set up the baud rate */ 764 serper = quot - 1; 765 766 /* Enable or disable parity bit */ 767 768 if(cval & UART_LCR_PARITY) 769 serper |= (SERPER_PARENB); 770 771 custom.serper = serper; 772 mb(); 773 } 774 775 local_irq_restore(flags); 776 } 777 778 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 779 { 780 struct serial_state *info; 781 unsigned long flags; 782 783 info = tty->driver_data; 784 785 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 786 return 0; 787 788 if (!info->xmit.buf) 789 return 0; 790 791 local_irq_save(flags); 792 if (CIRC_SPACE(info->xmit.head, 793 info->xmit.tail, 794 SERIAL_XMIT_SIZE) == 0) { 795 local_irq_restore(flags); 796 return 0; 797 } 798 799 info->xmit.buf[info->xmit.head++] = ch; 800 info->xmit.head &= SERIAL_XMIT_SIZE-1; 801 local_irq_restore(flags); 802 return 1; 803 } 804 805 static void rs_flush_chars(struct tty_struct *tty) 806 { 807 struct serial_state *info = tty->driver_data; 808 unsigned long flags; 809 810 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 811 return; 812 813 if (info->xmit.head == info->xmit.tail 814 || tty->stopped 815 || tty->hw_stopped 816 || !info->xmit.buf) 817 return; 818 819 local_irq_save(flags); 820 info->IER |= UART_IER_THRI; 821 custom.intena = IF_SETCLR | IF_TBE; 822 mb(); 823 /* set a pending Tx Interrupt, transmitter should restart now */ 824 custom.intreq = IF_SETCLR | IF_TBE; 825 mb(); 826 local_irq_restore(flags); 827 } 828 829 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 830 { 831 int c, ret = 0; 832 struct serial_state *info = tty->driver_data; 833 unsigned long flags; 834 835 if (serial_paranoia_check(info, tty->name, "rs_write")) 836 return 0; 837 838 if (!info->xmit.buf) 839 return 0; 840 841 local_irq_save(flags); 842 while (1) { 843 c = CIRC_SPACE_TO_END(info->xmit.head, 844 info->xmit.tail, 845 SERIAL_XMIT_SIZE); 846 if (count < c) 847 c = count; 848 if (c <= 0) { 849 break; 850 } 851 memcpy(info->xmit.buf + info->xmit.head, buf, c); 852 info->xmit.head = ((info->xmit.head + c) & 853 (SERIAL_XMIT_SIZE-1)); 854 buf += c; 855 count -= c; 856 ret += c; 857 } 858 local_irq_restore(flags); 859 860 if (info->xmit.head != info->xmit.tail 861 && !tty->stopped 862 && !tty->hw_stopped 863 && !(info->IER & UART_IER_THRI)) { 864 info->IER |= UART_IER_THRI; 865 local_irq_disable(); 866 custom.intena = IF_SETCLR | IF_TBE; 867 mb(); 868 /* set a pending Tx Interrupt, transmitter should restart now */ 869 custom.intreq = IF_SETCLR | IF_TBE; 870 mb(); 871 local_irq_restore(flags); 872 } 873 return ret; 874 } 875 876 static int rs_write_room(struct tty_struct *tty) 877 { 878 struct serial_state *info = tty->driver_data; 879 880 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 881 return 0; 882 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 883 } 884 885 static int rs_chars_in_buffer(struct tty_struct *tty) 886 { 887 struct serial_state *info = tty->driver_data; 888 889 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 890 return 0; 891 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 892 } 893 894 static void rs_flush_buffer(struct tty_struct *tty) 895 { 896 struct serial_state *info = tty->driver_data; 897 unsigned long flags; 898 899 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 900 return; 901 local_irq_save(flags); 902 info->xmit.head = info->xmit.tail = 0; 903 local_irq_restore(flags); 904 tty_wakeup(tty); 905 } 906 907 /* 908 * This function is used to send a high-priority XON/XOFF character to 909 * the device 910 */ 911 static void rs_send_xchar(struct tty_struct *tty, char ch) 912 { 913 struct serial_state *info = tty->driver_data; 914 unsigned long flags; 915 916 if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) 917 return; 918 919 info->x_char = ch; 920 if (ch) { 921 /* Make sure transmit interrupts are on */ 922 923 /* Check this ! */ 924 local_irq_save(flags); 925 if(!(custom.intenar & IF_TBE)) { 926 custom.intena = IF_SETCLR | IF_TBE; 927 mb(); 928 /* set a pending Tx Interrupt, transmitter should restart now */ 929 custom.intreq = IF_SETCLR | IF_TBE; 930 mb(); 931 } 932 local_irq_restore(flags); 933 934 info->IER |= UART_IER_THRI; 935 } 936 } 937 938 /* 939 * ------------------------------------------------------------ 940 * rs_throttle() 941 * 942 * This routine is called by the upper-layer tty layer to signal that 943 * incoming characters should be throttled. 944 * ------------------------------------------------------------ 945 */ 946 static void rs_throttle(struct tty_struct * tty) 947 { 948 struct serial_state *info = tty->driver_data; 949 unsigned long flags; 950 #ifdef SERIAL_DEBUG_THROTTLE 951 printk("throttle %s ....\n", tty_name(tty)); 952 #endif 953 954 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 955 return; 956 957 if (I_IXOFF(tty)) 958 rs_send_xchar(tty, STOP_CHAR(tty)); 959 960 if (C_CRTSCTS(tty)) 961 info->MCR &= ~SER_RTS; 962 963 local_irq_save(flags); 964 rtsdtr_ctrl(info->MCR); 965 local_irq_restore(flags); 966 } 967 968 static void rs_unthrottle(struct tty_struct * tty) 969 { 970 struct serial_state *info = tty->driver_data; 971 unsigned long flags; 972 #ifdef SERIAL_DEBUG_THROTTLE 973 printk("unthrottle %s ....\n", tty_name(tty)); 974 #endif 975 976 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 977 return; 978 979 if (I_IXOFF(tty)) { 980 if (info->x_char) 981 info->x_char = 0; 982 else 983 rs_send_xchar(tty, START_CHAR(tty)); 984 } 985 if (C_CRTSCTS(tty)) 986 info->MCR |= SER_RTS; 987 local_irq_save(flags); 988 rtsdtr_ctrl(info->MCR); 989 local_irq_restore(flags); 990 } 991 992 /* 993 * ------------------------------------------------------------ 994 * rs_ioctl() and friends 995 * ------------------------------------------------------------ 996 */ 997 998 static int get_serial_info(struct tty_struct *tty, struct serial_state *state, 999 struct serial_struct __user * retinfo) 1000 { 1001 struct serial_struct tmp; 1002 1003 memset(&tmp, 0, sizeof(tmp)); 1004 tty_lock(tty); 1005 tmp.line = tty->index; 1006 tmp.port = state->port; 1007 tmp.flags = state->tport.flags; 1008 tmp.xmit_fifo_size = state->xmit_fifo_size; 1009 tmp.baud_base = state->baud_base; 1010 tmp.close_delay = state->tport.close_delay; 1011 tmp.closing_wait = state->tport.closing_wait; 1012 tmp.custom_divisor = state->custom_divisor; 1013 tty_unlock(tty); 1014 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) 1015 return -EFAULT; 1016 return 0; 1017 } 1018 1019 static int set_serial_info(struct tty_struct *tty, struct serial_state *state, 1020 struct serial_struct __user * new_info) 1021 { 1022 struct tty_port *port = &state->tport; 1023 struct serial_struct new_serial; 1024 bool change_spd; 1025 int retval = 0; 1026 1027 if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) 1028 return -EFAULT; 1029 1030 tty_lock(tty); 1031 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || 1032 new_serial.custom_divisor != state->custom_divisor; 1033 if (new_serial.irq || new_serial.port != state->port || 1034 new_serial.xmit_fifo_size != state->xmit_fifo_size) { 1035 tty_unlock(tty); 1036 return -EINVAL; 1037 } 1038 1039 if (!serial_isroot()) { 1040 if ((new_serial.baud_base != state->baud_base) || 1041 (new_serial.close_delay != port->close_delay) || 1042 (new_serial.xmit_fifo_size != state->xmit_fifo_size) || 1043 ((new_serial.flags & ~ASYNC_USR_MASK) != 1044 (port->flags & ~ASYNC_USR_MASK))) { 1045 tty_unlock(tty); 1046 return -EPERM; 1047 } 1048 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1049 (new_serial.flags & ASYNC_USR_MASK)); 1050 state->custom_divisor = new_serial.custom_divisor; 1051 goto check_and_exit; 1052 } 1053 1054 if (new_serial.baud_base < 9600) { 1055 tty_unlock(tty); 1056 return -EINVAL; 1057 } 1058 1059 /* 1060 * OK, past this point, all the error checking has been done. 1061 * At this point, we start making changes..... 1062 */ 1063 1064 state->baud_base = new_serial.baud_base; 1065 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1066 (new_serial.flags & ASYNC_FLAGS)); 1067 state->custom_divisor = new_serial.custom_divisor; 1068 port->close_delay = new_serial.close_delay * HZ/100; 1069 port->closing_wait = new_serial.closing_wait * HZ/100; 1070 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1071 1072 check_and_exit: 1073 if (tty_port_initialized(port)) { 1074 if (change_spd) { 1075 /* warn about deprecation unless clearing */ 1076 if (new_serial.flags & ASYNC_SPD_MASK) 1077 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); 1078 change_speed(tty, state, NULL); 1079 } 1080 } else 1081 retval = startup(tty, state); 1082 tty_unlock(tty); 1083 return retval; 1084 } 1085 1086 1087 /* 1088 * get_lsr_info - get line status register info 1089 * 1090 * Purpose: Let user call ioctl() to get info when the UART physically 1091 * is emptied. On bus types like RS485, the transmitter must 1092 * release the bus after transmitting. This must be done when 1093 * the transmit shift register is empty, not be done when the 1094 * transmit holding register is empty. This functionality 1095 * allows an RS485 driver to be written in user space. 1096 */ 1097 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1098 { 1099 unsigned char status; 1100 unsigned int result; 1101 unsigned long flags; 1102 1103 local_irq_save(flags); 1104 status = custom.serdatr; 1105 mb(); 1106 local_irq_restore(flags); 1107 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1108 if (copy_to_user(value, &result, sizeof(int))) 1109 return -EFAULT; 1110 return 0; 1111 } 1112 1113 1114 static int rs_tiocmget(struct tty_struct *tty) 1115 { 1116 struct serial_state *info = tty->driver_data; 1117 unsigned char control, status; 1118 unsigned long flags; 1119 1120 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1121 return -ENODEV; 1122 if (tty_io_error(tty)) 1123 return -EIO; 1124 1125 control = info->MCR; 1126 local_irq_save(flags); 1127 status = ciab.pra; 1128 local_irq_restore(flags); 1129 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1130 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1131 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1132 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1133 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1134 } 1135 1136 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1137 unsigned int clear) 1138 { 1139 struct serial_state *info = tty->driver_data; 1140 unsigned long flags; 1141 1142 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1143 return -ENODEV; 1144 if (tty_io_error(tty)) 1145 return -EIO; 1146 1147 local_irq_save(flags); 1148 if (set & TIOCM_RTS) 1149 info->MCR |= SER_RTS; 1150 if (set & TIOCM_DTR) 1151 info->MCR |= SER_DTR; 1152 if (clear & TIOCM_RTS) 1153 info->MCR &= ~SER_RTS; 1154 if (clear & TIOCM_DTR) 1155 info->MCR &= ~SER_DTR; 1156 rtsdtr_ctrl(info->MCR); 1157 local_irq_restore(flags); 1158 return 0; 1159 } 1160 1161 /* 1162 * rs_break() --- routine which turns the break handling on or off 1163 */ 1164 static int rs_break(struct tty_struct *tty, int break_state) 1165 { 1166 struct serial_state *info = tty->driver_data; 1167 unsigned long flags; 1168 1169 if (serial_paranoia_check(info, tty->name, "rs_break")) 1170 return -EINVAL; 1171 1172 local_irq_save(flags); 1173 if (break_state == -1) 1174 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1175 else 1176 custom.adkcon = AC_UARTBRK; 1177 mb(); 1178 local_irq_restore(flags); 1179 return 0; 1180 } 1181 1182 /* 1183 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1184 * Return: write counters to the user passed counter struct 1185 * NB: both 1->0 and 0->1 transitions are counted except for 1186 * RI where only 0->1 is counted. 1187 */ 1188 static int rs_get_icount(struct tty_struct *tty, 1189 struct serial_icounter_struct *icount) 1190 { 1191 struct serial_state *info = tty->driver_data; 1192 struct async_icount cnow; 1193 unsigned long flags; 1194 1195 local_irq_save(flags); 1196 cnow = info->icount; 1197 local_irq_restore(flags); 1198 icount->cts = cnow.cts; 1199 icount->dsr = cnow.dsr; 1200 icount->rng = cnow.rng; 1201 icount->dcd = cnow.dcd; 1202 icount->rx = cnow.rx; 1203 icount->tx = cnow.tx; 1204 icount->frame = cnow.frame; 1205 icount->overrun = cnow.overrun; 1206 icount->parity = cnow.parity; 1207 icount->brk = cnow.brk; 1208 icount->buf_overrun = cnow.buf_overrun; 1209 1210 return 0; 1211 } 1212 1213 static int rs_ioctl(struct tty_struct *tty, 1214 unsigned int cmd, unsigned long arg) 1215 { 1216 struct serial_state *info = tty->driver_data; 1217 struct async_icount cprev, cnow; /* kernel counter temps */ 1218 void __user *argp = (void __user *)arg; 1219 unsigned long flags; 1220 DEFINE_WAIT(wait); 1221 int ret; 1222 1223 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1224 return -ENODEV; 1225 1226 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1227 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1228 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1229 if (tty_io_error(tty)) 1230 return -EIO; 1231 } 1232 1233 switch (cmd) { 1234 case TIOCGSERIAL: 1235 return get_serial_info(tty, info, argp); 1236 case TIOCSSERIAL: 1237 return set_serial_info(tty, info, argp); 1238 case TIOCSERCONFIG: 1239 return 0; 1240 1241 case TIOCSERGETLSR: /* Get line status register */ 1242 return get_lsr_info(info, argp); 1243 1244 case TIOCSERGSTRUCT: 1245 if (copy_to_user(argp, 1246 info, sizeof(struct serial_state))) 1247 return -EFAULT; 1248 return 0; 1249 1250 /* 1251 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1252 * - mask passed in arg for lines of interest 1253 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1254 * Caller should use TIOCGICOUNT to see which one it was 1255 */ 1256 case TIOCMIWAIT: 1257 local_irq_save(flags); 1258 /* note the counters on entry */ 1259 cprev = info->icount; 1260 local_irq_restore(flags); 1261 while (1) { 1262 prepare_to_wait(&info->tport.delta_msr_wait, 1263 &wait, TASK_INTERRUPTIBLE); 1264 local_irq_save(flags); 1265 cnow = info->icount; /* atomic copy */ 1266 local_irq_restore(flags); 1267 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1268 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 1269 ret = -EIO; /* no change => error */ 1270 break; 1271 } 1272 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1273 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1274 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1275 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1276 ret = 0; 1277 break; 1278 } 1279 schedule(); 1280 /* see if a signal did it */ 1281 if (signal_pending(current)) { 1282 ret = -ERESTARTSYS; 1283 break; 1284 } 1285 cprev = cnow; 1286 } 1287 finish_wait(&info->tport.delta_msr_wait, &wait); 1288 return ret; 1289 1290 case TIOCSERGWILD: 1291 case TIOCSERSWILD: 1292 /* "setserial -W" is called in Debian boot */ 1293 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1294 return 0; 1295 1296 default: 1297 return -ENOIOCTLCMD; 1298 } 1299 return 0; 1300 } 1301 1302 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1303 { 1304 struct serial_state *info = tty->driver_data; 1305 unsigned long flags; 1306 unsigned int cflag = tty->termios.c_cflag; 1307 1308 change_speed(tty, info, old_termios); 1309 1310 /* Handle transition to B0 status */ 1311 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { 1312 info->MCR &= ~(SER_DTR|SER_RTS); 1313 local_irq_save(flags); 1314 rtsdtr_ctrl(info->MCR); 1315 local_irq_restore(flags); 1316 } 1317 1318 /* Handle transition away from B0 status */ 1319 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1320 info->MCR |= SER_DTR; 1321 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 1322 info->MCR |= SER_RTS; 1323 local_irq_save(flags); 1324 rtsdtr_ctrl(info->MCR); 1325 local_irq_restore(flags); 1326 } 1327 1328 /* Handle turning off CRTSCTS */ 1329 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 1330 tty->hw_stopped = 0; 1331 rs_start(tty); 1332 } 1333 1334 #if 0 1335 /* 1336 * No need to wake up processes in open wait, since they 1337 * sample the CLOCAL flag once, and don't recheck it. 1338 * XXX It's not clear whether the current behavior is correct 1339 * or not. Hence, this may change..... 1340 */ 1341 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1342 wake_up_interruptible(&info->open_wait); 1343 #endif 1344 } 1345 1346 /* 1347 * ------------------------------------------------------------ 1348 * rs_close() 1349 * 1350 * This routine is called when the serial port gets closed. First, we 1351 * wait for the last remaining data to be sent. Then, we unlink its 1352 * async structure from the interrupt chain if necessary, and we free 1353 * that IRQ if nothing is left in the chain. 1354 * ------------------------------------------------------------ 1355 */ 1356 static void rs_close(struct tty_struct *tty, struct file * filp) 1357 { 1358 struct serial_state *state = tty->driver_data; 1359 struct tty_port *port = &state->tport; 1360 1361 if (serial_paranoia_check(state, tty->name, "rs_close")) 1362 return; 1363 1364 if (tty_port_close_start(port, tty, filp) == 0) 1365 return; 1366 1367 /* 1368 * At this point we stop accepting input. To do this, we 1369 * disable the receive line status interrupts, and tell the 1370 * interrupt driver to stop checking the data ready bit in the 1371 * line status register. 1372 */ 1373 state->read_status_mask &= ~UART_LSR_DR; 1374 if (tty_port_initialized(port)) { 1375 /* disable receive interrupts */ 1376 custom.intena = IF_RBF; 1377 mb(); 1378 /* clear any pending receive interrupt */ 1379 custom.intreq = IF_RBF; 1380 mb(); 1381 1382 /* 1383 * Before we drop DTR, make sure the UART transmitter 1384 * has completely drained; this is especially 1385 * important if there is a transmit FIFO! 1386 */ 1387 rs_wait_until_sent(tty, state->timeout); 1388 } 1389 shutdown(tty, state); 1390 rs_flush_buffer(tty); 1391 1392 tty_ldisc_flush(tty); 1393 port->tty = NULL; 1394 1395 tty_port_close_end(port, tty); 1396 } 1397 1398 /* 1399 * rs_wait_until_sent() --- wait until the transmitter is empty 1400 */ 1401 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1402 { 1403 struct serial_state *info = tty->driver_data; 1404 unsigned long orig_jiffies, char_time; 1405 int lsr; 1406 1407 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1408 return; 1409 1410 if (info->xmit_fifo_size == 0) 1411 return; /* Just in case.... */ 1412 1413 orig_jiffies = jiffies; 1414 1415 /* 1416 * Set the check interval to be 1/5 of the estimated time to 1417 * send a single character, and make it at least 1. The check 1418 * interval should also be less than the timeout. 1419 * 1420 * Note: we have to use pretty tight timings here to satisfy 1421 * the NIST-PCTS. 1422 */ 1423 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1424 char_time = char_time / 5; 1425 if (char_time == 0) 1426 char_time = 1; 1427 if (timeout) 1428 char_time = min_t(unsigned long, char_time, timeout); 1429 /* 1430 * If the transmitter hasn't cleared in twice the approximate 1431 * amount of time to send the entire FIFO, it probably won't 1432 * ever clear. This assumes the UART isn't doing flow 1433 * control, which is currently the case. Hence, if it ever 1434 * takes longer than info->timeout, this is probably due to a 1435 * UART bug of some kind. So, we clamp the timeout parameter at 1436 * 2*info->timeout. 1437 */ 1438 if (!timeout || timeout > 2*info->timeout) 1439 timeout = 2*info->timeout; 1440 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1441 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1442 printk("jiff=%lu...", jiffies); 1443 #endif 1444 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1445 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1446 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1447 #endif 1448 msleep_interruptible(jiffies_to_msecs(char_time)); 1449 if (signal_pending(current)) 1450 break; 1451 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1452 break; 1453 } 1454 __set_current_state(TASK_RUNNING); 1455 1456 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1457 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1458 #endif 1459 } 1460 1461 /* 1462 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1463 */ 1464 static void rs_hangup(struct tty_struct *tty) 1465 { 1466 struct serial_state *info = tty->driver_data; 1467 1468 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1469 return; 1470 1471 rs_flush_buffer(tty); 1472 shutdown(tty, info); 1473 info->tport.count = 0; 1474 tty_port_set_active(&info->tport, 0); 1475 info->tport.tty = NULL; 1476 wake_up_interruptible(&info->tport.open_wait); 1477 } 1478 1479 /* 1480 * This routine is called whenever a serial port is opened. It 1481 * enables interrupts for a serial port, linking in its async structure into 1482 * the IRQ chain. It also performs the serial-specific 1483 * initialization for the tty structure. 1484 */ 1485 static int rs_open(struct tty_struct *tty, struct file * filp) 1486 { 1487 struct serial_state *info = rs_table + tty->index; 1488 struct tty_port *port = &info->tport; 1489 int retval; 1490 1491 port->count++; 1492 port->tty = tty; 1493 tty->driver_data = info; 1494 tty->port = port; 1495 if (serial_paranoia_check(info, tty->name, "rs_open")) 1496 return -ENODEV; 1497 1498 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1499 1500 retval = startup(tty, info); 1501 if (retval) { 1502 return retval; 1503 } 1504 1505 return tty_port_block_til_ready(port, tty, filp); 1506 } 1507 1508 /* 1509 * /proc fs routines.... 1510 */ 1511 1512 static inline void line_info(struct seq_file *m, int line, 1513 struct serial_state *state) 1514 { 1515 char stat_buf[30], control, status; 1516 unsigned long flags; 1517 1518 seq_printf(m, "%d: uart:amiga_builtin", line); 1519 1520 local_irq_save(flags); 1521 status = ciab.pra; 1522 control = tty_port_initialized(&state->tport) ? state->MCR : status; 1523 local_irq_restore(flags); 1524 1525 stat_buf[0] = 0; 1526 stat_buf[1] = 0; 1527 if(!(control & SER_RTS)) 1528 strcat(stat_buf, "|RTS"); 1529 if(!(status & SER_CTS)) 1530 strcat(stat_buf, "|CTS"); 1531 if(!(control & SER_DTR)) 1532 strcat(stat_buf, "|DTR"); 1533 if(!(status & SER_DSR)) 1534 strcat(stat_buf, "|DSR"); 1535 if(!(status & SER_DCD)) 1536 strcat(stat_buf, "|CD"); 1537 1538 if (state->quot) 1539 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1540 1541 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1542 1543 if (state->icount.frame) 1544 seq_printf(m, " fe:%d", state->icount.frame); 1545 1546 if (state->icount.parity) 1547 seq_printf(m, " pe:%d", state->icount.parity); 1548 1549 if (state->icount.brk) 1550 seq_printf(m, " brk:%d", state->icount.brk); 1551 1552 if (state->icount.overrun) 1553 seq_printf(m, " oe:%d", state->icount.overrun); 1554 1555 /* 1556 * Last thing is the RS-232 status lines 1557 */ 1558 seq_printf(m, " %s\n", stat_buf+1); 1559 } 1560 1561 static int rs_proc_show(struct seq_file *m, void *v) 1562 { 1563 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1564 line_info(m, 0, &rs_table[0]); 1565 return 0; 1566 } 1567 1568 static int rs_proc_open(struct inode *inode, struct file *file) 1569 { 1570 return single_open(file, rs_proc_show, NULL); 1571 } 1572 1573 static const struct file_operations rs_proc_fops = { 1574 .owner = THIS_MODULE, 1575 .open = rs_proc_open, 1576 .read = seq_read, 1577 .llseek = seq_lseek, 1578 .release = single_release, 1579 }; 1580 1581 /* 1582 * --------------------------------------------------------------------- 1583 * rs_init() and friends 1584 * 1585 * rs_init() is called at boot-time to initialize the serial driver. 1586 * --------------------------------------------------------------------- 1587 */ 1588 1589 /* 1590 * This routine prints out the appropriate serial driver version 1591 * number, and identifies which options were configured into this 1592 * driver. 1593 */ 1594 static void show_serial_version(void) 1595 { 1596 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1597 } 1598 1599 1600 static const struct tty_operations serial_ops = { 1601 .open = rs_open, 1602 .close = rs_close, 1603 .write = rs_write, 1604 .put_char = rs_put_char, 1605 .flush_chars = rs_flush_chars, 1606 .write_room = rs_write_room, 1607 .chars_in_buffer = rs_chars_in_buffer, 1608 .flush_buffer = rs_flush_buffer, 1609 .ioctl = rs_ioctl, 1610 .throttle = rs_throttle, 1611 .unthrottle = rs_unthrottle, 1612 .set_termios = rs_set_termios, 1613 .stop = rs_stop, 1614 .start = rs_start, 1615 .hangup = rs_hangup, 1616 .break_ctl = rs_break, 1617 .send_xchar = rs_send_xchar, 1618 .wait_until_sent = rs_wait_until_sent, 1619 .tiocmget = rs_tiocmget, 1620 .tiocmset = rs_tiocmset, 1621 .get_icount = rs_get_icount, 1622 .proc_fops = &rs_proc_fops, 1623 }; 1624 1625 static int amiga_carrier_raised(struct tty_port *port) 1626 { 1627 return !(ciab.pra & SER_DCD); 1628 } 1629 1630 static void amiga_dtr_rts(struct tty_port *port, int raise) 1631 { 1632 struct serial_state *info = container_of(port, struct serial_state, 1633 tport); 1634 unsigned long flags; 1635 1636 if (raise) 1637 info->MCR |= SER_DTR|SER_RTS; 1638 else 1639 info->MCR &= ~(SER_DTR|SER_RTS); 1640 1641 local_irq_save(flags); 1642 rtsdtr_ctrl(info->MCR); 1643 local_irq_restore(flags); 1644 } 1645 1646 static const struct tty_port_operations amiga_port_ops = { 1647 .carrier_raised = amiga_carrier_raised, 1648 .dtr_rts = amiga_dtr_rts, 1649 }; 1650 1651 /* 1652 * The serial driver boot-time initialization code! 1653 */ 1654 static int __init amiga_serial_probe(struct platform_device *pdev) 1655 { 1656 unsigned long flags; 1657 struct serial_state * state; 1658 int error; 1659 1660 serial_driver = alloc_tty_driver(NR_PORTS); 1661 if (!serial_driver) 1662 return -ENOMEM; 1663 1664 show_serial_version(); 1665 1666 /* Initialize the tty_driver structure */ 1667 1668 serial_driver->driver_name = "amiserial"; 1669 serial_driver->name = "ttyS"; 1670 serial_driver->major = TTY_MAJOR; 1671 serial_driver->minor_start = 64; 1672 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1673 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1674 serial_driver->init_termios = tty_std_termios; 1675 serial_driver->init_termios.c_cflag = 1676 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1677 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1678 tty_set_operations(serial_driver, &serial_ops); 1679 1680 state = rs_table; 1681 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1682 state->custom_divisor = 0; 1683 state->icount.cts = state->icount.dsr = 1684 state->icount.rng = state->icount.dcd = 0; 1685 state->icount.rx = state->icount.tx = 0; 1686 state->icount.frame = state->icount.parity = 0; 1687 state->icount.overrun = state->icount.brk = 0; 1688 tty_port_init(&state->tport); 1689 state->tport.ops = &amiga_port_ops; 1690 tty_port_link_device(&state->tport, serial_driver, 0); 1691 1692 error = tty_register_driver(serial_driver); 1693 if (error) 1694 goto fail_put_tty_driver; 1695 1696 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1697 1698 /* Hardware set up */ 1699 1700 state->baud_base = amiga_colorclock; 1701 state->xmit_fifo_size = 1; 1702 1703 /* set ISRs, and then disable the rx interrupts */ 1704 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1705 if (error) 1706 goto fail_unregister; 1707 1708 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1709 "serial RX", state); 1710 if (error) 1711 goto fail_free_irq; 1712 1713 local_irq_save(flags); 1714 1715 /* turn off Rx and Tx interrupts */ 1716 custom.intena = IF_RBF | IF_TBE; 1717 mb(); 1718 1719 /* clear any pending interrupt */ 1720 custom.intreq = IF_RBF | IF_TBE; 1721 mb(); 1722 1723 local_irq_restore(flags); 1724 1725 /* 1726 * set the appropriate directions for the modem control flags, 1727 * and clear RTS and DTR 1728 */ 1729 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1730 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1731 1732 platform_set_drvdata(pdev, state); 1733 1734 return 0; 1735 1736 fail_free_irq: 1737 free_irq(IRQ_AMIGA_TBE, state); 1738 fail_unregister: 1739 tty_unregister_driver(serial_driver); 1740 fail_put_tty_driver: 1741 tty_port_destroy(&state->tport); 1742 put_tty_driver(serial_driver); 1743 return error; 1744 } 1745 1746 static int __exit amiga_serial_remove(struct platform_device *pdev) 1747 { 1748 int error; 1749 struct serial_state *state = platform_get_drvdata(pdev); 1750 1751 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1752 error = tty_unregister_driver(serial_driver); 1753 if (error) 1754 printk("SERIAL: failed to unregister serial driver (%d)\n", 1755 error); 1756 put_tty_driver(serial_driver); 1757 tty_port_destroy(&state->tport); 1758 1759 free_irq(IRQ_AMIGA_TBE, state); 1760 free_irq(IRQ_AMIGA_RBF, state); 1761 1762 return error; 1763 } 1764 1765 static struct platform_driver amiga_serial_driver = { 1766 .remove = __exit_p(amiga_serial_remove), 1767 .driver = { 1768 .name = "amiga-serial", 1769 }, 1770 }; 1771 1772 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1773 1774 1775 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1776 1777 /* 1778 * ------------------------------------------------------------ 1779 * Serial console driver 1780 * ------------------------------------------------------------ 1781 */ 1782 1783 static void amiga_serial_putc(char c) 1784 { 1785 custom.serdat = (unsigned char)c | 0x100; 1786 while (!(custom.serdatr & 0x2000)) 1787 barrier(); 1788 } 1789 1790 /* 1791 * Print a string to the serial port trying not to disturb 1792 * any possible real use of the port... 1793 * 1794 * The console must be locked when we get here. 1795 */ 1796 static void serial_console_write(struct console *co, const char *s, 1797 unsigned count) 1798 { 1799 unsigned short intena = custom.intenar; 1800 1801 custom.intena = IF_TBE; 1802 1803 while (count--) { 1804 if (*s == '\n') 1805 amiga_serial_putc('\r'); 1806 amiga_serial_putc(*s++); 1807 } 1808 1809 custom.intena = IF_SETCLR | (intena & IF_TBE); 1810 } 1811 1812 static struct tty_driver *serial_console_device(struct console *c, int *index) 1813 { 1814 *index = 0; 1815 return serial_driver; 1816 } 1817 1818 static struct console sercons = { 1819 .name = "ttyS", 1820 .write = serial_console_write, 1821 .device = serial_console_device, 1822 .flags = CON_PRINTBUFFER, 1823 .index = -1, 1824 }; 1825 1826 /* 1827 * Register console. 1828 */ 1829 static int __init amiserial_console_init(void) 1830 { 1831 if (!MACH_IS_AMIGA) 1832 return -ENODEV; 1833 1834 register_console(&sercons); 1835 return 0; 1836 } 1837 console_initcall(amiserial_console_init); 1838 1839 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1840 1841 MODULE_LICENSE("GPL"); 1842 MODULE_ALIAS("platform:amiga-serial"); 1843