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 #include <asm/system.h> 89 90 #include <asm/irq.h> 91 92 #include <asm/amigahw.h> 93 #include <asm/amigaints.h> 94 95 struct serial_state { 96 struct tty_port tport; 97 struct circ_buf xmit; 98 struct async_icount icount; 99 100 unsigned long port; 101 int baud_base; 102 int xmit_fifo_size; 103 int custom_divisor; 104 int read_status_mask; 105 int ignore_status_mask; 106 int timeout; 107 int quot; 108 int IER; /* Interrupt Enable Register */ 109 int MCR; /* Modem control register */ 110 int x_char; /* xon/xoff character */ 111 }; 112 113 #define custom amiga_custom 114 static char *serial_name = "Amiga-builtin serial driver"; 115 116 static struct tty_driver *serial_driver; 117 118 /* number of characters left in xmit buffer before we ask for more */ 119 #define WAKEUP_CHARS 256 120 121 static unsigned char current_ctl_bits; 122 123 static void change_speed(struct tty_struct *tty, struct serial_state *info, 124 struct ktermios *old); 125 static void rs_wait_until_sent(struct tty_struct *tty, int timeout); 126 127 128 static struct serial_state rs_table[1]; 129 130 #define NR_PORTS ARRAY_SIZE(rs_table) 131 132 #include <asm/uaccess.h> 133 134 #define serial_isroot() (capable(CAP_SYS_ADMIN)) 135 136 137 static inline int serial_paranoia_check(struct serial_state *info, 138 char *name, const char *routine) 139 { 140 #ifdef SERIAL_PARANOIA_CHECK 141 static const char *badmagic = 142 "Warning: bad magic number for serial struct (%s) in %s\n"; 143 static const char *badinfo = 144 "Warning: null async_struct for (%s) in %s\n"; 145 146 if (!info) { 147 printk(badinfo, name, routine); 148 return 1; 149 } 150 if (info->magic != SERIAL_MAGIC) { 151 printk(badmagic, name, routine); 152 return 1; 153 } 154 #endif 155 return 0; 156 } 157 158 /* some serial hardware definitions */ 159 #define SDR_OVRUN (1<<15) 160 #define SDR_RBF (1<<14) 161 #define SDR_TBE (1<<13) 162 #define SDR_TSRE (1<<12) 163 164 #define SERPER_PARENB (1<<15) 165 166 #define AC_SETCLR (1<<15) 167 #define AC_UARTBRK (1<<11) 168 169 #define SER_DTR (1<<7) 170 #define SER_RTS (1<<6) 171 #define SER_DCD (1<<5) 172 #define SER_CTS (1<<4) 173 #define SER_DSR (1<<3) 174 175 static __inline__ void rtsdtr_ctrl(int bits) 176 { 177 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); 178 } 179 180 /* 181 * ------------------------------------------------------------ 182 * rs_stop() and rs_start() 183 * 184 * This routines are called before setting or resetting tty->stopped. 185 * They enable or disable transmitter interrupts, as necessary. 186 * ------------------------------------------------------------ 187 */ 188 static void rs_stop(struct tty_struct *tty) 189 { 190 struct serial_state *info = tty->driver_data; 191 unsigned long flags; 192 193 if (serial_paranoia_check(info, tty->name, "rs_stop")) 194 return; 195 196 local_irq_save(flags); 197 if (info->IER & UART_IER_THRI) { 198 info->IER &= ~UART_IER_THRI; 199 /* disable Tx interrupt and remove any pending interrupts */ 200 custom.intena = IF_TBE; 201 mb(); 202 custom.intreq = IF_TBE; 203 mb(); 204 } 205 local_irq_restore(flags); 206 } 207 208 static void rs_start(struct tty_struct *tty) 209 { 210 struct serial_state *info = tty->driver_data; 211 unsigned long flags; 212 213 if (serial_paranoia_check(info, tty->name, "rs_start")) 214 return; 215 216 local_irq_save(flags); 217 if (info->xmit.head != info->xmit.tail 218 && info->xmit.buf 219 && !(info->IER & UART_IER_THRI)) { 220 info->IER |= UART_IER_THRI; 221 custom.intena = IF_SETCLR | IF_TBE; 222 mb(); 223 /* set a pending Tx Interrupt, transmitter should restart now */ 224 custom.intreq = IF_SETCLR | IF_TBE; 225 mb(); 226 } 227 local_irq_restore(flags); 228 } 229 230 /* 231 * ---------------------------------------------------------------------- 232 * 233 * Here starts the interrupt handling routines. All of the following 234 * subroutines are declared as inline and are folded into 235 * rs_interrupt(). They were separated out for readability's sake. 236 * 237 * Note: rs_interrupt() is a "fast" interrupt, which means that it 238 * runs with interrupts turned off. People who may want to modify 239 * rs_interrupt() should try to keep the interrupt handler as fast as 240 * possible. After you are done making modifications, it is not a bad 241 * idea to do: 242 * 243 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c 244 * 245 * and look at the resulting assemble code in serial.s. 246 * 247 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 248 * ----------------------------------------------------------------------- 249 */ 250 251 static void receive_chars(struct serial_state *info) 252 { 253 int status; 254 int serdatr; 255 struct tty_struct *tty = info->tport.tty; 256 unsigned char ch, flag; 257 struct async_icount *icount; 258 int oe = 0; 259 260 icount = &info->icount; 261 262 status = UART_LSR_DR; /* We obviously have a character! */ 263 serdatr = custom.serdatr; 264 mb(); 265 custom.intreq = IF_RBF; 266 mb(); 267 268 if((serdatr & 0x1ff) == 0) 269 status |= UART_LSR_BI; 270 if(serdatr & SDR_OVRUN) 271 status |= UART_LSR_OE; 272 273 ch = serdatr & 0xff; 274 icount->rx++; 275 276 #ifdef SERIAL_DEBUG_INTR 277 printk("DR%02x:%02x...", ch, status); 278 #endif 279 flag = TTY_NORMAL; 280 281 /* 282 * We don't handle parity or frame errors - but I have left 283 * the code in, since I'm not sure that the errors can't be 284 * detected. 285 */ 286 287 if (status & (UART_LSR_BI | UART_LSR_PE | 288 UART_LSR_FE | UART_LSR_OE)) { 289 /* 290 * For statistics only 291 */ 292 if (status & UART_LSR_BI) { 293 status &= ~(UART_LSR_FE | UART_LSR_PE); 294 icount->brk++; 295 } else if (status & UART_LSR_PE) 296 icount->parity++; 297 else if (status & UART_LSR_FE) 298 icount->frame++; 299 if (status & UART_LSR_OE) 300 icount->overrun++; 301 302 /* 303 * Now check to see if character should be 304 * ignored, and mask off conditions which 305 * should be ignored. 306 */ 307 if (status & info->ignore_status_mask) 308 goto out; 309 310 status &= info->read_status_mask; 311 312 if (status & (UART_LSR_BI)) { 313 #ifdef SERIAL_DEBUG_INTR 314 printk("handling break...."); 315 #endif 316 flag = TTY_BREAK; 317 if (info->tport.flags & ASYNC_SAK) 318 do_SAK(tty); 319 } else if (status & UART_LSR_PE) 320 flag = TTY_PARITY; 321 else if (status & UART_LSR_FE) 322 flag = TTY_FRAME; 323 if (status & UART_LSR_OE) { 324 /* 325 * Overrun is special, since it's 326 * reported immediately, and doesn't 327 * affect the current character 328 */ 329 oe = 1; 330 } 331 } 332 tty_insert_flip_char(tty, ch, flag); 333 if (oe == 1) 334 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 335 tty_flip_buffer_push(tty); 336 out: 337 return; 338 } 339 340 static void transmit_chars(struct serial_state *info) 341 { 342 custom.intreq = IF_TBE; 343 mb(); 344 if (info->x_char) { 345 custom.serdat = info->x_char | 0x100; 346 mb(); 347 info->icount.tx++; 348 info->x_char = 0; 349 return; 350 } 351 if (info->xmit.head == info->xmit.tail 352 || info->tport.tty->stopped 353 || info->tport.tty->hw_stopped) { 354 info->IER &= ~UART_IER_THRI; 355 custom.intena = IF_TBE; 356 mb(); 357 return; 358 } 359 360 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; 361 mb(); 362 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); 363 info->icount.tx++; 364 365 if (CIRC_CNT(info->xmit.head, 366 info->xmit.tail, 367 SERIAL_XMIT_SIZE) < WAKEUP_CHARS) 368 tty_wakeup(info->tport.tty); 369 370 #ifdef SERIAL_DEBUG_INTR 371 printk("THRE..."); 372 #endif 373 if (info->xmit.head == info->xmit.tail) { 374 custom.intena = IF_TBE; 375 mb(); 376 info->IER &= ~UART_IER_THRI; 377 } 378 } 379 380 static void check_modem_status(struct serial_state *info) 381 { 382 struct tty_port *port = &info->tport; 383 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 384 unsigned char dstatus; 385 struct async_icount *icount; 386 387 /* Determine bits that have changed */ 388 dstatus = status ^ current_ctl_bits; 389 current_ctl_bits = status; 390 391 if (dstatus) { 392 icount = &info->icount; 393 /* update input line counters */ 394 if (dstatus & SER_DSR) 395 icount->dsr++; 396 if (dstatus & SER_DCD) { 397 icount->dcd++; 398 #ifdef CONFIG_HARD_PPS 399 if ((port->flags & ASYNC_HARDPPS_CD) && 400 !(status & SER_DCD)) 401 hardpps(); 402 #endif 403 } 404 if (dstatus & SER_CTS) 405 icount->cts++; 406 wake_up_interruptible(&port->delta_msr_wait); 407 } 408 409 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { 410 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) 411 printk("ttyS%d CD now %s...", info->line, 412 (!(status & SER_DCD)) ? "on" : "off"); 413 #endif 414 if (!(status & SER_DCD)) 415 wake_up_interruptible(&port->open_wait); 416 else { 417 #ifdef SERIAL_DEBUG_OPEN 418 printk("doing serial hangup..."); 419 #endif 420 if (port->tty) 421 tty_hangup(port->tty); 422 } 423 } 424 if (port->flags & ASYNC_CTS_FLOW) { 425 if (port->tty->hw_stopped) { 426 if (!(status & SER_CTS)) { 427 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 428 printk("CTS tx start..."); 429 #endif 430 port->tty->hw_stopped = 0; 431 info->IER |= UART_IER_THRI; 432 custom.intena = IF_SETCLR | IF_TBE; 433 mb(); 434 /* set a pending Tx Interrupt, transmitter should restart now */ 435 custom.intreq = IF_SETCLR | IF_TBE; 436 mb(); 437 tty_wakeup(port->tty); 438 return; 439 } 440 } else { 441 if ((status & SER_CTS)) { 442 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 443 printk("CTS tx stop..."); 444 #endif 445 port->tty->hw_stopped = 1; 446 info->IER &= ~UART_IER_THRI; 447 /* disable Tx interrupt and remove any pending interrupts */ 448 custom.intena = IF_TBE; 449 mb(); 450 custom.intreq = IF_TBE; 451 mb(); 452 } 453 } 454 } 455 } 456 457 static irqreturn_t ser_vbl_int( int irq, void *data) 458 { 459 /* vbl is just a periodic interrupt we tie into to update modem status */ 460 struct serial_state *info = data; 461 /* 462 * TBD - is it better to unregister from this interrupt or to 463 * ignore it if MSI is clear ? 464 */ 465 if(info->IER & UART_IER_MSI) 466 check_modem_status(info); 467 return IRQ_HANDLED; 468 } 469 470 static irqreturn_t ser_rx_int(int irq, void *dev_id) 471 { 472 struct serial_state *info = dev_id; 473 474 #ifdef SERIAL_DEBUG_INTR 475 printk("ser_rx_int..."); 476 #endif 477 478 if (!info->tport.tty) 479 return IRQ_NONE; 480 481 receive_chars(info); 482 #ifdef SERIAL_DEBUG_INTR 483 printk("end.\n"); 484 #endif 485 return IRQ_HANDLED; 486 } 487 488 static irqreturn_t ser_tx_int(int irq, void *dev_id) 489 { 490 struct serial_state *info = dev_id; 491 492 if (custom.serdatr & SDR_TBE) { 493 #ifdef SERIAL_DEBUG_INTR 494 printk("ser_tx_int..."); 495 #endif 496 497 if (!info->tport.tty) 498 return IRQ_NONE; 499 500 transmit_chars(info); 501 #ifdef SERIAL_DEBUG_INTR 502 printk("end.\n"); 503 #endif 504 } 505 return IRQ_HANDLED; 506 } 507 508 /* 509 * ------------------------------------------------------------------- 510 * Here ends the serial interrupt routines. 511 * ------------------------------------------------------------------- 512 */ 513 514 /* 515 * --------------------------------------------------------------- 516 * Low level utility subroutines for the serial driver: routines to 517 * figure out the appropriate timeout for an interrupt chain, routines 518 * to initialize and startup a serial port, and routines to shutdown a 519 * serial port. Useful stuff like that. 520 * --------------------------------------------------------------- 521 */ 522 523 static int startup(struct tty_struct *tty, struct serial_state *info) 524 { 525 struct tty_port *port = &info->tport; 526 unsigned long flags; 527 int retval=0; 528 unsigned long page; 529 530 page = get_zeroed_page(GFP_KERNEL); 531 if (!page) 532 return -ENOMEM; 533 534 local_irq_save(flags); 535 536 if (port->flags & ASYNC_INITIALIZED) { 537 free_page(page); 538 goto errout; 539 } 540 541 if (info->xmit.buf) 542 free_page(page); 543 else 544 info->xmit.buf = (unsigned char *) page; 545 546 #ifdef SERIAL_DEBUG_OPEN 547 printk("starting up ttys%d ...", info->line); 548 #endif 549 550 /* Clear anything in the input buffer */ 551 552 custom.intreq = IF_RBF; 553 mb(); 554 555 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); 556 if (retval) { 557 if (serial_isroot()) { 558 set_bit(TTY_IO_ERROR, &tty->flags); 559 retval = 0; 560 } 561 goto errout; 562 } 563 564 /* enable both Rx and Tx interrupts */ 565 custom.intena = IF_SETCLR | IF_RBF | IF_TBE; 566 mb(); 567 info->IER = UART_IER_MSI; 568 569 /* remember current state of the DCD and CTS bits */ 570 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 571 572 info->MCR = 0; 573 if (C_BAUD(tty)) 574 info->MCR = SER_DTR | SER_RTS; 575 rtsdtr_ctrl(info->MCR); 576 577 clear_bit(TTY_IO_ERROR, &tty->flags); 578 info->xmit.head = info->xmit.tail = 0; 579 580 /* 581 * Set up the tty->alt_speed kludge 582 */ 583 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 584 tty->alt_speed = 57600; 585 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 586 tty->alt_speed = 115200; 587 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 588 tty->alt_speed = 230400; 589 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 590 tty->alt_speed = 460800; 591 592 /* 593 * and set the speed of the serial port 594 */ 595 change_speed(tty, info, NULL); 596 597 port->flags |= ASYNC_INITIALIZED; 598 local_irq_restore(flags); 599 return 0; 600 601 errout: 602 local_irq_restore(flags); 603 return retval; 604 } 605 606 /* 607 * This routine will shutdown a serial port; interrupts are disabled, and 608 * DTR is dropped if the hangup on close termio flag is on. 609 */ 610 static void shutdown(struct tty_struct *tty, struct serial_state *info) 611 { 612 unsigned long flags; 613 struct serial_state *state; 614 615 if (!(info->tport.flags & ASYNC_INITIALIZED)) 616 return; 617 618 state = info; 619 620 #ifdef SERIAL_DEBUG_OPEN 621 printk("Shutting down serial port %d ....\n", info->line); 622 #endif 623 624 local_irq_save(flags); /* Disable interrupts */ 625 626 /* 627 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 628 * here so the queue might never be waken up 629 */ 630 wake_up_interruptible(&info->tport.delta_msr_wait); 631 632 /* 633 * Free the IRQ, if necessary 634 */ 635 free_irq(IRQ_AMIGA_VERTB, info); 636 637 if (info->xmit.buf) { 638 free_page((unsigned long) info->xmit.buf); 639 info->xmit.buf = NULL; 640 } 641 642 info->IER = 0; 643 custom.intena = IF_RBF | IF_TBE; 644 mb(); 645 646 /* disable break condition */ 647 custom.adkcon = AC_UARTBRK; 648 mb(); 649 650 if (tty->termios->c_cflag & HUPCL) 651 info->MCR &= ~(SER_DTR|SER_RTS); 652 rtsdtr_ctrl(info->MCR); 653 654 set_bit(TTY_IO_ERROR, &tty->flags); 655 656 info->tport.flags &= ~ASYNC_INITIALIZED; 657 local_irq_restore(flags); 658 } 659 660 661 /* 662 * This routine is called to set the UART divisor registers to match 663 * the specified baud rate for a serial port. 664 */ 665 static void change_speed(struct tty_struct *tty, struct serial_state *info, 666 struct ktermios *old_termios) 667 { 668 struct tty_port *port = &info->tport; 669 int quot = 0, baud_base, baud; 670 unsigned cflag, cval = 0; 671 int bits; 672 unsigned long flags; 673 674 cflag = tty->termios->c_cflag; 675 676 /* Byte size is always 8 bits plus parity bit if requested */ 677 678 cval = 3; bits = 10; 679 if (cflag & CSTOPB) { 680 cval |= 0x04; 681 bits++; 682 } 683 if (cflag & PARENB) { 684 cval |= UART_LCR_PARITY; 685 bits++; 686 } 687 if (!(cflag & PARODD)) 688 cval |= UART_LCR_EPAR; 689 #ifdef CMSPAR 690 if (cflag & CMSPAR) 691 cval |= UART_LCR_SPAR; 692 #endif 693 694 /* Determine divisor based on baud rate */ 695 baud = tty_get_baud_rate(tty); 696 if (!baud) 697 baud = 9600; /* B0 transition handled in rs_set_termios */ 698 baud_base = info->baud_base; 699 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 700 quot = info->custom_divisor; 701 else { 702 if (baud == 134) 703 /* Special case since 134 is really 134.5 */ 704 quot = (2*baud_base / 269); 705 else if (baud) 706 quot = baud_base / baud; 707 } 708 /* If the quotient is zero refuse the change */ 709 if (!quot && old_termios) { 710 /* FIXME: Will need updating for new tty in the end */ 711 tty->termios->c_cflag &= ~CBAUD; 712 tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD); 713 baud = tty_get_baud_rate(tty); 714 if (!baud) 715 baud = 9600; 716 if (baud == 38400 && 717 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 718 quot = info->custom_divisor; 719 else { 720 if (baud == 134) 721 /* Special case since 134 is really 134.5 */ 722 quot = (2*baud_base / 269); 723 else if (baud) 724 quot = baud_base / baud; 725 } 726 } 727 /* As a last resort, if the quotient is zero, default to 9600 bps */ 728 if (!quot) 729 quot = baud_base / 9600; 730 info->quot = quot; 731 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); 732 info->timeout += HZ/50; /* Add .02 seconds of slop */ 733 734 /* CTS flow control flag and modem status interrupts */ 735 info->IER &= ~UART_IER_MSI; 736 if (port->flags & ASYNC_HARDPPS_CD) 737 info->IER |= UART_IER_MSI; 738 if (cflag & CRTSCTS) { 739 port->flags |= ASYNC_CTS_FLOW; 740 info->IER |= UART_IER_MSI; 741 } else 742 port->flags &= ~ASYNC_CTS_FLOW; 743 if (cflag & CLOCAL) 744 port->flags &= ~ASYNC_CHECK_CD; 745 else { 746 port->flags |= ASYNC_CHECK_CD; 747 info->IER |= UART_IER_MSI; 748 } 749 /* TBD: 750 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 751 */ 752 753 /* 754 * Set up parity check flag 755 */ 756 757 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 758 if (I_INPCK(tty)) 759 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 760 if (I_BRKINT(tty) || I_PARMRK(tty)) 761 info->read_status_mask |= UART_LSR_BI; 762 763 /* 764 * Characters to ignore 765 */ 766 info->ignore_status_mask = 0; 767 if (I_IGNPAR(tty)) 768 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 769 if (I_IGNBRK(tty)) { 770 info->ignore_status_mask |= UART_LSR_BI; 771 /* 772 * If we're ignore parity and break indicators, ignore 773 * overruns too. (For real raw support). 774 */ 775 if (I_IGNPAR(tty)) 776 info->ignore_status_mask |= UART_LSR_OE; 777 } 778 /* 779 * !!! ignore all characters if CREAD is not set 780 */ 781 if ((cflag & CREAD) == 0) 782 info->ignore_status_mask |= UART_LSR_DR; 783 local_irq_save(flags); 784 785 { 786 short serper; 787 788 /* Set up the baud rate */ 789 serper = quot - 1; 790 791 /* Enable or disable parity bit */ 792 793 if(cval & UART_LCR_PARITY) 794 serper |= (SERPER_PARENB); 795 796 custom.serper = serper; 797 mb(); 798 } 799 800 local_irq_restore(flags); 801 } 802 803 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 804 { 805 struct serial_state *info; 806 unsigned long flags; 807 808 info = tty->driver_data; 809 810 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 811 return 0; 812 813 if (!info->xmit.buf) 814 return 0; 815 816 local_irq_save(flags); 817 if (CIRC_SPACE(info->xmit.head, 818 info->xmit.tail, 819 SERIAL_XMIT_SIZE) == 0) { 820 local_irq_restore(flags); 821 return 0; 822 } 823 824 info->xmit.buf[info->xmit.head++] = ch; 825 info->xmit.head &= SERIAL_XMIT_SIZE-1; 826 local_irq_restore(flags); 827 return 1; 828 } 829 830 static void rs_flush_chars(struct tty_struct *tty) 831 { 832 struct serial_state *info = tty->driver_data; 833 unsigned long flags; 834 835 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 836 return; 837 838 if (info->xmit.head == info->xmit.tail 839 || tty->stopped 840 || tty->hw_stopped 841 || !info->xmit.buf) 842 return; 843 844 local_irq_save(flags); 845 info->IER |= UART_IER_THRI; 846 custom.intena = IF_SETCLR | IF_TBE; 847 mb(); 848 /* set a pending Tx Interrupt, transmitter should restart now */ 849 custom.intreq = IF_SETCLR | IF_TBE; 850 mb(); 851 local_irq_restore(flags); 852 } 853 854 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 855 { 856 int c, ret = 0; 857 struct serial_state *info = tty->driver_data; 858 unsigned long flags; 859 860 if (serial_paranoia_check(info, tty->name, "rs_write")) 861 return 0; 862 863 if (!info->xmit.buf) 864 return 0; 865 866 local_irq_save(flags); 867 while (1) { 868 c = CIRC_SPACE_TO_END(info->xmit.head, 869 info->xmit.tail, 870 SERIAL_XMIT_SIZE); 871 if (count < c) 872 c = count; 873 if (c <= 0) { 874 break; 875 } 876 memcpy(info->xmit.buf + info->xmit.head, buf, c); 877 info->xmit.head = ((info->xmit.head + c) & 878 (SERIAL_XMIT_SIZE-1)); 879 buf += c; 880 count -= c; 881 ret += c; 882 } 883 local_irq_restore(flags); 884 885 if (info->xmit.head != info->xmit.tail 886 && !tty->stopped 887 && !tty->hw_stopped 888 && !(info->IER & UART_IER_THRI)) { 889 info->IER |= UART_IER_THRI; 890 local_irq_disable(); 891 custom.intena = IF_SETCLR | IF_TBE; 892 mb(); 893 /* set a pending Tx Interrupt, transmitter should restart now */ 894 custom.intreq = IF_SETCLR | IF_TBE; 895 mb(); 896 local_irq_restore(flags); 897 } 898 return ret; 899 } 900 901 static int rs_write_room(struct tty_struct *tty) 902 { 903 struct serial_state *info = tty->driver_data; 904 905 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 906 return 0; 907 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 908 } 909 910 static int rs_chars_in_buffer(struct tty_struct *tty) 911 { 912 struct serial_state *info = tty->driver_data; 913 914 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 915 return 0; 916 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 917 } 918 919 static void rs_flush_buffer(struct tty_struct *tty) 920 { 921 struct serial_state *info = tty->driver_data; 922 unsigned long flags; 923 924 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 925 return; 926 local_irq_save(flags); 927 info->xmit.head = info->xmit.tail = 0; 928 local_irq_restore(flags); 929 tty_wakeup(tty); 930 } 931 932 /* 933 * This function is used to send a high-priority XON/XOFF character to 934 * the device 935 */ 936 static void rs_send_xchar(struct tty_struct *tty, char ch) 937 { 938 struct serial_state *info = tty->driver_data; 939 unsigned long flags; 940 941 if (serial_paranoia_check(info, tty->name, "rs_send_char")) 942 return; 943 944 info->x_char = ch; 945 if (ch) { 946 /* Make sure transmit interrupts are on */ 947 948 /* Check this ! */ 949 local_irq_save(flags); 950 if(!(custom.intenar & IF_TBE)) { 951 custom.intena = IF_SETCLR | IF_TBE; 952 mb(); 953 /* set a pending Tx Interrupt, transmitter should restart now */ 954 custom.intreq = IF_SETCLR | IF_TBE; 955 mb(); 956 } 957 local_irq_restore(flags); 958 959 info->IER |= UART_IER_THRI; 960 } 961 } 962 963 /* 964 * ------------------------------------------------------------ 965 * rs_throttle() 966 * 967 * This routine is called by the upper-layer tty layer to signal that 968 * incoming characters should be throttled. 969 * ------------------------------------------------------------ 970 */ 971 static void rs_throttle(struct tty_struct * tty) 972 { 973 struct serial_state *info = tty->driver_data; 974 unsigned long flags; 975 #ifdef SERIAL_DEBUG_THROTTLE 976 char buf[64]; 977 978 printk("throttle %s: %d....\n", tty_name(tty, buf), 979 tty->ldisc.chars_in_buffer(tty)); 980 #endif 981 982 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 983 return; 984 985 if (I_IXOFF(tty)) 986 rs_send_xchar(tty, STOP_CHAR(tty)); 987 988 if (tty->termios->c_cflag & CRTSCTS) 989 info->MCR &= ~SER_RTS; 990 991 local_irq_save(flags); 992 rtsdtr_ctrl(info->MCR); 993 local_irq_restore(flags); 994 } 995 996 static void rs_unthrottle(struct tty_struct * tty) 997 { 998 struct serial_state *info = tty->driver_data; 999 unsigned long flags; 1000 #ifdef SERIAL_DEBUG_THROTTLE 1001 char buf[64]; 1002 1003 printk("unthrottle %s: %d....\n", tty_name(tty, buf), 1004 tty->ldisc.chars_in_buffer(tty)); 1005 #endif 1006 1007 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 1008 return; 1009 1010 if (I_IXOFF(tty)) { 1011 if (info->x_char) 1012 info->x_char = 0; 1013 else 1014 rs_send_xchar(tty, START_CHAR(tty)); 1015 } 1016 if (tty->termios->c_cflag & CRTSCTS) 1017 info->MCR |= SER_RTS; 1018 local_irq_save(flags); 1019 rtsdtr_ctrl(info->MCR); 1020 local_irq_restore(flags); 1021 } 1022 1023 /* 1024 * ------------------------------------------------------------ 1025 * rs_ioctl() and friends 1026 * ------------------------------------------------------------ 1027 */ 1028 1029 static int get_serial_info(struct tty_struct *tty, struct serial_state *state, 1030 struct serial_struct __user * retinfo) 1031 { 1032 struct serial_struct tmp; 1033 1034 if (!retinfo) 1035 return -EFAULT; 1036 memset(&tmp, 0, sizeof(tmp)); 1037 tty_lock(); 1038 tmp.line = tty->index; 1039 tmp.port = state->port; 1040 tmp.flags = state->tport.flags; 1041 tmp.xmit_fifo_size = state->xmit_fifo_size; 1042 tmp.baud_base = state->baud_base; 1043 tmp.close_delay = state->tport.close_delay; 1044 tmp.closing_wait = state->tport.closing_wait; 1045 tmp.custom_divisor = state->custom_divisor; 1046 tty_unlock(); 1047 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) 1048 return -EFAULT; 1049 return 0; 1050 } 1051 1052 static int set_serial_info(struct tty_struct *tty, struct serial_state *state, 1053 struct serial_struct __user * new_info) 1054 { 1055 struct tty_port *port = &state->tport; 1056 struct serial_struct new_serial; 1057 bool change_spd; 1058 int retval = 0; 1059 1060 if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) 1061 return -EFAULT; 1062 1063 tty_lock(); 1064 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || 1065 new_serial.custom_divisor != state->custom_divisor; 1066 if (new_serial.irq || new_serial.port != state->port || 1067 new_serial.xmit_fifo_size != state->xmit_fifo_size) { 1068 tty_unlock(); 1069 return -EINVAL; 1070 } 1071 1072 if (!serial_isroot()) { 1073 if ((new_serial.baud_base != state->baud_base) || 1074 (new_serial.close_delay != port->close_delay) || 1075 (new_serial.xmit_fifo_size != state->xmit_fifo_size) || 1076 ((new_serial.flags & ~ASYNC_USR_MASK) != 1077 (port->flags & ~ASYNC_USR_MASK))) 1078 return -EPERM; 1079 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1080 (new_serial.flags & ASYNC_USR_MASK)); 1081 state->custom_divisor = new_serial.custom_divisor; 1082 goto check_and_exit; 1083 } 1084 1085 if (new_serial.baud_base < 9600) { 1086 tty_unlock(); 1087 return -EINVAL; 1088 } 1089 1090 /* 1091 * OK, past this point, all the error checking has been done. 1092 * At this point, we start making changes..... 1093 */ 1094 1095 state->baud_base = new_serial.baud_base; 1096 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1097 (new_serial.flags & ASYNC_FLAGS)); 1098 state->custom_divisor = new_serial.custom_divisor; 1099 port->close_delay = new_serial.close_delay * HZ/100; 1100 port->closing_wait = new_serial.closing_wait * HZ/100; 1101 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1102 1103 check_and_exit: 1104 if (port->flags & ASYNC_INITIALIZED) { 1105 if (change_spd) { 1106 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 1107 tty->alt_speed = 57600; 1108 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 1109 tty->alt_speed = 115200; 1110 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 1111 tty->alt_speed = 230400; 1112 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 1113 tty->alt_speed = 460800; 1114 change_speed(tty, state, NULL); 1115 } 1116 } else 1117 retval = startup(tty, state); 1118 tty_unlock(); 1119 return retval; 1120 } 1121 1122 1123 /* 1124 * get_lsr_info - get line status register info 1125 * 1126 * Purpose: Let user call ioctl() to get info when the UART physically 1127 * is emptied. On bus types like RS485, the transmitter must 1128 * release the bus after transmitting. This must be done when 1129 * the transmit shift register is empty, not be done when the 1130 * transmit holding register is empty. This functionality 1131 * allows an RS485 driver to be written in user space. 1132 */ 1133 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1134 { 1135 unsigned char status; 1136 unsigned int result; 1137 unsigned long flags; 1138 1139 local_irq_save(flags); 1140 status = custom.serdatr; 1141 mb(); 1142 local_irq_restore(flags); 1143 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1144 if (copy_to_user(value, &result, sizeof(int))) 1145 return -EFAULT; 1146 return 0; 1147 } 1148 1149 1150 static int rs_tiocmget(struct tty_struct *tty) 1151 { 1152 struct serial_state *info = tty->driver_data; 1153 unsigned char control, status; 1154 unsigned long flags; 1155 1156 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1157 return -ENODEV; 1158 if (tty->flags & (1 << TTY_IO_ERROR)) 1159 return -EIO; 1160 1161 control = info->MCR; 1162 local_irq_save(flags); 1163 status = ciab.pra; 1164 local_irq_restore(flags); 1165 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1166 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1167 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1168 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1169 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1170 } 1171 1172 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1173 unsigned int clear) 1174 { 1175 struct serial_state *info = tty->driver_data; 1176 unsigned long flags; 1177 1178 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1179 return -ENODEV; 1180 if (tty->flags & (1 << TTY_IO_ERROR)) 1181 return -EIO; 1182 1183 local_irq_save(flags); 1184 if (set & TIOCM_RTS) 1185 info->MCR |= SER_RTS; 1186 if (set & TIOCM_DTR) 1187 info->MCR |= SER_DTR; 1188 if (clear & TIOCM_RTS) 1189 info->MCR &= ~SER_RTS; 1190 if (clear & TIOCM_DTR) 1191 info->MCR &= ~SER_DTR; 1192 rtsdtr_ctrl(info->MCR); 1193 local_irq_restore(flags); 1194 return 0; 1195 } 1196 1197 /* 1198 * rs_break() --- routine which turns the break handling on or off 1199 */ 1200 static int rs_break(struct tty_struct *tty, int break_state) 1201 { 1202 struct serial_state *info = tty->driver_data; 1203 unsigned long flags; 1204 1205 if (serial_paranoia_check(info, tty->name, "rs_break")) 1206 return -EINVAL; 1207 1208 local_irq_save(flags); 1209 if (break_state == -1) 1210 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1211 else 1212 custom.adkcon = AC_UARTBRK; 1213 mb(); 1214 local_irq_restore(flags); 1215 return 0; 1216 } 1217 1218 /* 1219 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1220 * Return: write counters to the user passed counter struct 1221 * NB: both 1->0 and 0->1 transitions are counted except for 1222 * RI where only 0->1 is counted. 1223 */ 1224 static int rs_get_icount(struct tty_struct *tty, 1225 struct serial_icounter_struct *icount) 1226 { 1227 struct serial_state *info = tty->driver_data; 1228 struct async_icount cnow; 1229 unsigned long flags; 1230 1231 local_irq_save(flags); 1232 cnow = info->icount; 1233 local_irq_restore(flags); 1234 icount->cts = cnow.cts; 1235 icount->dsr = cnow.dsr; 1236 icount->rng = cnow.rng; 1237 icount->dcd = cnow.dcd; 1238 icount->rx = cnow.rx; 1239 icount->tx = cnow.tx; 1240 icount->frame = cnow.frame; 1241 icount->overrun = cnow.overrun; 1242 icount->parity = cnow.parity; 1243 icount->brk = cnow.brk; 1244 icount->buf_overrun = cnow.buf_overrun; 1245 1246 return 0; 1247 } 1248 1249 static int rs_ioctl(struct tty_struct *tty, 1250 unsigned int cmd, unsigned long arg) 1251 { 1252 struct serial_state *info = tty->driver_data; 1253 struct async_icount cprev, cnow; /* kernel counter temps */ 1254 void __user *argp = (void __user *)arg; 1255 unsigned long flags; 1256 1257 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1258 return -ENODEV; 1259 1260 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1261 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1262 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1263 if (tty->flags & (1 << TTY_IO_ERROR)) 1264 return -EIO; 1265 } 1266 1267 switch (cmd) { 1268 case TIOCGSERIAL: 1269 return get_serial_info(tty, info, argp); 1270 case TIOCSSERIAL: 1271 return set_serial_info(tty, info, argp); 1272 case TIOCSERCONFIG: 1273 return 0; 1274 1275 case TIOCSERGETLSR: /* Get line status register */ 1276 return get_lsr_info(info, argp); 1277 1278 case TIOCSERGSTRUCT: 1279 if (copy_to_user(argp, 1280 info, sizeof(struct serial_state))) 1281 return -EFAULT; 1282 return 0; 1283 1284 /* 1285 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1286 * - mask passed in arg for lines of interest 1287 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1288 * Caller should use TIOCGICOUNT to see which one it was 1289 */ 1290 case TIOCMIWAIT: 1291 local_irq_save(flags); 1292 /* note the counters on entry */ 1293 cprev = info->icount; 1294 local_irq_restore(flags); 1295 while (1) { 1296 interruptible_sleep_on(&info->tport.delta_msr_wait); 1297 /* see if a signal did it */ 1298 if (signal_pending(current)) 1299 return -ERESTARTSYS; 1300 local_irq_save(flags); 1301 cnow = info->icount; /* atomic copy */ 1302 local_irq_restore(flags); 1303 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1304 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 1305 return -EIO; /* no change => error */ 1306 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1307 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1308 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1309 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1310 return 0; 1311 } 1312 cprev = cnow; 1313 } 1314 /* NOTREACHED */ 1315 1316 case TIOCSERGWILD: 1317 case TIOCSERSWILD: 1318 /* "setserial -W" is called in Debian boot */ 1319 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1320 return 0; 1321 1322 default: 1323 return -ENOIOCTLCMD; 1324 } 1325 return 0; 1326 } 1327 1328 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1329 { 1330 struct serial_state *info = tty->driver_data; 1331 unsigned long flags; 1332 unsigned int cflag = tty->termios->c_cflag; 1333 1334 change_speed(tty, info, old_termios); 1335 1336 /* Handle transition to B0 status */ 1337 if ((old_termios->c_cflag & CBAUD) && 1338 !(cflag & CBAUD)) { 1339 info->MCR &= ~(SER_DTR|SER_RTS); 1340 local_irq_save(flags); 1341 rtsdtr_ctrl(info->MCR); 1342 local_irq_restore(flags); 1343 } 1344 1345 /* Handle transition away from B0 status */ 1346 if (!(old_termios->c_cflag & CBAUD) && 1347 (cflag & CBAUD)) { 1348 info->MCR |= SER_DTR; 1349 if (!(tty->termios->c_cflag & CRTSCTS) || 1350 !test_bit(TTY_THROTTLED, &tty->flags)) { 1351 info->MCR |= SER_RTS; 1352 } 1353 local_irq_save(flags); 1354 rtsdtr_ctrl(info->MCR); 1355 local_irq_restore(flags); 1356 } 1357 1358 /* Handle turning off CRTSCTS */ 1359 if ((old_termios->c_cflag & CRTSCTS) && 1360 !(tty->termios->c_cflag & CRTSCTS)) { 1361 tty->hw_stopped = 0; 1362 rs_start(tty); 1363 } 1364 1365 #if 0 1366 /* 1367 * No need to wake up processes in open wait, since they 1368 * sample the CLOCAL flag once, and don't recheck it. 1369 * XXX It's not clear whether the current behavior is correct 1370 * or not. Hence, this may change..... 1371 */ 1372 if (!(old_termios->c_cflag & CLOCAL) && 1373 (tty->termios->c_cflag & CLOCAL)) 1374 wake_up_interruptible(&info->open_wait); 1375 #endif 1376 } 1377 1378 /* 1379 * ------------------------------------------------------------ 1380 * rs_close() 1381 * 1382 * This routine is called when the serial port gets closed. First, we 1383 * wait for the last remaining data to be sent. Then, we unlink its 1384 * async structure from the interrupt chain if necessary, and we free 1385 * that IRQ if nothing is left in the chain. 1386 * ------------------------------------------------------------ 1387 */ 1388 static void rs_close(struct tty_struct *tty, struct file * filp) 1389 { 1390 struct serial_state *state = tty->driver_data; 1391 struct tty_port *port = &state->tport; 1392 1393 if (serial_paranoia_check(state, tty->name, "rs_close")) 1394 return; 1395 1396 if (tty_port_close_start(port, tty, filp) == 0) 1397 return; 1398 1399 /* 1400 * At this point we stop accepting input. To do this, we 1401 * disable the receive line status interrupts, and tell the 1402 * interrupt driver to stop checking the data ready bit in the 1403 * line status register. 1404 */ 1405 state->read_status_mask &= ~UART_LSR_DR; 1406 if (port->flags & ASYNC_INITIALIZED) { 1407 /* disable receive interrupts */ 1408 custom.intena = IF_RBF; 1409 mb(); 1410 /* clear any pending receive interrupt */ 1411 custom.intreq = IF_RBF; 1412 mb(); 1413 1414 /* 1415 * Before we drop DTR, make sure the UART transmitter 1416 * has completely drained; this is especially 1417 * important if there is a transmit FIFO! 1418 */ 1419 rs_wait_until_sent(tty, state->timeout); 1420 } 1421 shutdown(tty, state); 1422 rs_flush_buffer(tty); 1423 1424 tty_ldisc_flush(tty); 1425 port->tty = NULL; 1426 1427 tty_port_close_end(port, tty); 1428 } 1429 1430 /* 1431 * rs_wait_until_sent() --- wait until the transmitter is empty 1432 */ 1433 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1434 { 1435 struct serial_state *info = tty->driver_data; 1436 unsigned long orig_jiffies, char_time; 1437 int lsr; 1438 1439 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1440 return; 1441 1442 if (info->xmit_fifo_size == 0) 1443 return; /* Just in case.... */ 1444 1445 orig_jiffies = jiffies; 1446 1447 /* 1448 * Set the check interval to be 1/5 of the estimated time to 1449 * send a single character, and make it at least 1. The check 1450 * interval should also be less than the timeout. 1451 * 1452 * Note: we have to use pretty tight timings here to satisfy 1453 * the NIST-PCTS. 1454 */ 1455 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1456 char_time = char_time / 5; 1457 if (char_time == 0) 1458 char_time = 1; 1459 if (timeout) 1460 char_time = min_t(unsigned long, char_time, timeout); 1461 /* 1462 * If the transmitter hasn't cleared in twice the approximate 1463 * amount of time to send the entire FIFO, it probably won't 1464 * ever clear. This assumes the UART isn't doing flow 1465 * control, which is currently the case. Hence, if it ever 1466 * takes longer than info->timeout, this is probably due to a 1467 * UART bug of some kind. So, we clamp the timeout parameter at 1468 * 2*info->timeout. 1469 */ 1470 if (!timeout || timeout > 2*info->timeout) 1471 timeout = 2*info->timeout; 1472 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1473 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1474 printk("jiff=%lu...", jiffies); 1475 #endif 1476 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1477 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1478 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1479 #endif 1480 msleep_interruptible(jiffies_to_msecs(char_time)); 1481 if (signal_pending(current)) 1482 break; 1483 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1484 break; 1485 } 1486 __set_current_state(TASK_RUNNING); 1487 1488 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1489 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1490 #endif 1491 } 1492 1493 /* 1494 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1495 */ 1496 static void rs_hangup(struct tty_struct *tty) 1497 { 1498 struct serial_state *info = tty->driver_data; 1499 1500 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1501 return; 1502 1503 rs_flush_buffer(tty); 1504 shutdown(tty, info); 1505 info->tport.count = 0; 1506 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; 1507 info->tport.tty = NULL; 1508 wake_up_interruptible(&info->tport.open_wait); 1509 } 1510 1511 /* 1512 * This routine is called whenever a serial port is opened. It 1513 * enables interrupts for a serial port, linking in its async structure into 1514 * the IRQ chain. It also performs the serial-specific 1515 * initialization for the tty structure. 1516 */ 1517 static int rs_open(struct tty_struct *tty, struct file * filp) 1518 { 1519 struct serial_state *info = rs_table + tty->index; 1520 struct tty_port *port = &info->tport; 1521 int retval; 1522 1523 port->count++; 1524 port->tty = tty; 1525 tty->driver_data = info; 1526 tty->port = port; 1527 if (serial_paranoia_check(info, tty->name, "rs_open")) 1528 return -ENODEV; 1529 1530 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1531 1532 retval = startup(tty, info); 1533 if (retval) { 1534 return retval; 1535 } 1536 1537 return tty_port_block_til_ready(port, tty, filp); 1538 } 1539 1540 /* 1541 * /proc fs routines.... 1542 */ 1543 1544 static inline void line_info(struct seq_file *m, int line, 1545 struct serial_state *state) 1546 { 1547 char stat_buf[30], control, status; 1548 unsigned long flags; 1549 1550 seq_printf(m, "%d: uart:amiga_builtin", line); 1551 1552 local_irq_save(flags); 1553 status = ciab.pra; 1554 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status; 1555 local_irq_restore(flags); 1556 1557 stat_buf[0] = 0; 1558 stat_buf[1] = 0; 1559 if(!(control & SER_RTS)) 1560 strcat(stat_buf, "|RTS"); 1561 if(!(status & SER_CTS)) 1562 strcat(stat_buf, "|CTS"); 1563 if(!(control & SER_DTR)) 1564 strcat(stat_buf, "|DTR"); 1565 if(!(status & SER_DSR)) 1566 strcat(stat_buf, "|DSR"); 1567 if(!(status & SER_DCD)) 1568 strcat(stat_buf, "|CD"); 1569 1570 if (state->quot) 1571 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1572 1573 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1574 1575 if (state->icount.frame) 1576 seq_printf(m, " fe:%d", state->icount.frame); 1577 1578 if (state->icount.parity) 1579 seq_printf(m, " pe:%d", state->icount.parity); 1580 1581 if (state->icount.brk) 1582 seq_printf(m, " brk:%d", state->icount.brk); 1583 1584 if (state->icount.overrun) 1585 seq_printf(m, " oe:%d", state->icount.overrun); 1586 1587 /* 1588 * Last thing is the RS-232 status lines 1589 */ 1590 seq_printf(m, " %s\n", stat_buf+1); 1591 } 1592 1593 static int rs_proc_show(struct seq_file *m, void *v) 1594 { 1595 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1596 line_info(m, 0, &rs_table[0]); 1597 return 0; 1598 } 1599 1600 static int rs_proc_open(struct inode *inode, struct file *file) 1601 { 1602 return single_open(file, rs_proc_show, NULL); 1603 } 1604 1605 static const struct file_operations rs_proc_fops = { 1606 .owner = THIS_MODULE, 1607 .open = rs_proc_open, 1608 .read = seq_read, 1609 .llseek = seq_lseek, 1610 .release = single_release, 1611 }; 1612 1613 /* 1614 * --------------------------------------------------------------------- 1615 * rs_init() and friends 1616 * 1617 * rs_init() is called at boot-time to initialize the serial driver. 1618 * --------------------------------------------------------------------- 1619 */ 1620 1621 /* 1622 * This routine prints out the appropriate serial driver version 1623 * number, and identifies which options were configured into this 1624 * driver. 1625 */ 1626 static void show_serial_version(void) 1627 { 1628 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1629 } 1630 1631 1632 static const struct tty_operations serial_ops = { 1633 .open = rs_open, 1634 .close = rs_close, 1635 .write = rs_write, 1636 .put_char = rs_put_char, 1637 .flush_chars = rs_flush_chars, 1638 .write_room = rs_write_room, 1639 .chars_in_buffer = rs_chars_in_buffer, 1640 .flush_buffer = rs_flush_buffer, 1641 .ioctl = rs_ioctl, 1642 .throttle = rs_throttle, 1643 .unthrottle = rs_unthrottle, 1644 .set_termios = rs_set_termios, 1645 .stop = rs_stop, 1646 .start = rs_start, 1647 .hangup = rs_hangup, 1648 .break_ctl = rs_break, 1649 .send_xchar = rs_send_xchar, 1650 .wait_until_sent = rs_wait_until_sent, 1651 .tiocmget = rs_tiocmget, 1652 .tiocmset = rs_tiocmset, 1653 .get_icount = rs_get_icount, 1654 .proc_fops = &rs_proc_fops, 1655 }; 1656 1657 static int amiga_carrier_raised(struct tty_port *port) 1658 { 1659 return !(ciab.pra & SER_DCD); 1660 } 1661 1662 static void amiga_dtr_rts(struct tty_port *port, int raise) 1663 { 1664 struct serial_state *info = container_of(port, struct serial_state, 1665 tport); 1666 unsigned long flags; 1667 1668 if (raise) 1669 info->MCR |= SER_DTR|SER_RTS; 1670 else 1671 info->MCR &= ~(SER_DTR|SER_RTS); 1672 1673 local_irq_save(flags); 1674 rtsdtr_ctrl(info->MCR); 1675 local_irq_restore(flags); 1676 } 1677 1678 static const struct tty_port_operations amiga_port_ops = { 1679 .carrier_raised = amiga_carrier_raised, 1680 .dtr_rts = amiga_dtr_rts, 1681 }; 1682 1683 /* 1684 * The serial driver boot-time initialization code! 1685 */ 1686 static int __init amiga_serial_probe(struct platform_device *pdev) 1687 { 1688 unsigned long flags; 1689 struct serial_state * state; 1690 int error; 1691 1692 serial_driver = alloc_tty_driver(NR_PORTS); 1693 if (!serial_driver) 1694 return -ENOMEM; 1695 1696 show_serial_version(); 1697 1698 /* Initialize the tty_driver structure */ 1699 1700 serial_driver->driver_name = "amiserial"; 1701 serial_driver->name = "ttyS"; 1702 serial_driver->major = TTY_MAJOR; 1703 serial_driver->minor_start = 64; 1704 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1705 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1706 serial_driver->init_termios = tty_std_termios; 1707 serial_driver->init_termios.c_cflag = 1708 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1709 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1710 tty_set_operations(serial_driver, &serial_ops); 1711 1712 error = tty_register_driver(serial_driver); 1713 if (error) 1714 goto fail_put_tty_driver; 1715 1716 state = rs_table; 1717 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1718 state->custom_divisor = 0; 1719 state->icount.cts = state->icount.dsr = 1720 state->icount.rng = state->icount.dcd = 0; 1721 state->icount.rx = state->icount.tx = 0; 1722 state->icount.frame = state->icount.parity = 0; 1723 state->icount.overrun = state->icount.brk = 0; 1724 tty_port_init(&state->tport); 1725 state->tport.ops = &amiga_port_ops; 1726 1727 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1728 1729 /* Hardware set up */ 1730 1731 state->baud_base = amiga_colorclock; 1732 state->xmit_fifo_size = 1; 1733 1734 /* set ISRs, and then disable the rx interrupts */ 1735 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1736 if (error) 1737 goto fail_unregister; 1738 1739 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1740 "serial RX", state); 1741 if (error) 1742 goto fail_free_irq; 1743 1744 local_irq_save(flags); 1745 1746 /* turn off Rx and Tx interrupts */ 1747 custom.intena = IF_RBF | IF_TBE; 1748 mb(); 1749 1750 /* clear any pending interrupt */ 1751 custom.intreq = IF_RBF | IF_TBE; 1752 mb(); 1753 1754 local_irq_restore(flags); 1755 1756 /* 1757 * set the appropriate directions for the modem control flags, 1758 * and clear RTS and DTR 1759 */ 1760 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1761 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1762 1763 platform_set_drvdata(pdev, state); 1764 1765 return 0; 1766 1767 fail_free_irq: 1768 free_irq(IRQ_AMIGA_TBE, state); 1769 fail_unregister: 1770 tty_unregister_driver(serial_driver); 1771 fail_put_tty_driver: 1772 put_tty_driver(serial_driver); 1773 return error; 1774 } 1775 1776 static int __exit amiga_serial_remove(struct platform_device *pdev) 1777 { 1778 int error; 1779 struct serial_state *state = platform_get_drvdata(pdev); 1780 1781 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1782 if ((error = tty_unregister_driver(serial_driver))) 1783 printk("SERIAL: failed to unregister serial driver (%d)\n", 1784 error); 1785 put_tty_driver(serial_driver); 1786 1787 free_irq(IRQ_AMIGA_TBE, state); 1788 free_irq(IRQ_AMIGA_RBF, state); 1789 1790 platform_set_drvdata(pdev, NULL); 1791 1792 return error; 1793 } 1794 1795 static struct platform_driver amiga_serial_driver = { 1796 .remove = __exit_p(amiga_serial_remove), 1797 .driver = { 1798 .name = "amiga-serial", 1799 .owner = THIS_MODULE, 1800 }, 1801 }; 1802 1803 static int __init amiga_serial_init(void) 1804 { 1805 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe); 1806 } 1807 1808 module_init(amiga_serial_init); 1809 1810 static void __exit amiga_serial_exit(void) 1811 { 1812 platform_driver_unregister(&amiga_serial_driver); 1813 } 1814 1815 module_exit(amiga_serial_exit); 1816 1817 1818 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1819 1820 /* 1821 * ------------------------------------------------------------ 1822 * Serial console driver 1823 * ------------------------------------------------------------ 1824 */ 1825 1826 static void amiga_serial_putc(char c) 1827 { 1828 custom.serdat = (unsigned char)c | 0x100; 1829 while (!(custom.serdatr & 0x2000)) 1830 barrier(); 1831 } 1832 1833 /* 1834 * Print a string to the serial port trying not to disturb 1835 * any possible real use of the port... 1836 * 1837 * The console must be locked when we get here. 1838 */ 1839 static void serial_console_write(struct console *co, const char *s, 1840 unsigned count) 1841 { 1842 unsigned short intena = custom.intenar; 1843 1844 custom.intena = IF_TBE; 1845 1846 while (count--) { 1847 if (*s == '\n') 1848 amiga_serial_putc('\r'); 1849 amiga_serial_putc(*s++); 1850 } 1851 1852 custom.intena = IF_SETCLR | (intena & IF_TBE); 1853 } 1854 1855 static struct tty_driver *serial_console_device(struct console *c, int *index) 1856 { 1857 *index = 0; 1858 return serial_driver; 1859 } 1860 1861 static struct console sercons = { 1862 .name = "ttyS", 1863 .write = serial_console_write, 1864 .device = serial_console_device, 1865 .flags = CON_PRINTBUFFER, 1866 .index = -1, 1867 }; 1868 1869 /* 1870 * Register console. 1871 */ 1872 static int __init amiserial_console_init(void) 1873 { 1874 register_console(&sercons); 1875 return 0; 1876 } 1877 console_initcall(amiserial_console_init); 1878 1879 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1880 1881 MODULE_LICENSE("GPL"); 1882 MODULE_ALIAS("platform:amiga-serial"); 1883