1 /* 2 * Serial driver for the amiga builtin port. 3 * 4 * This code was created by taking serial.c version 4.30 from kernel 5 * release 2.3.22, replacing all hardware related stuff with the 6 * corresponding amiga hardware actions, and removing all irrelevant 7 * code. As a consequence, it uses many of the constants and names 8 * associated with the registers and bits of 16550 compatible UARTS - 9 * but only to keep track of status, etc in the state variables. It 10 * was done this was to make it easier to keep the code in line with 11 * (non hardware specific) changes to serial.c. 12 * 13 * The port is registered with the tty driver as minor device 64, and 14 * therefore other ports should should only use 65 upwards. 15 * 16 * Richard Lucock 28/12/99 17 * 18 * Copyright (C) 1991, 1992 Linus Torvalds 19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 20 * 1998, 1999 Theodore Ts'o 21 * 22 */ 23 24 /* 25 * Serial driver configuration section. Here are the various options: 26 * 27 * SERIAL_PARANOIA_CHECK 28 * Check the magic number for the async_structure where 29 * ever possible. 30 */ 31 32 #include <linux/delay.h> 33 34 #undef SERIAL_PARANOIA_CHECK 35 #define SERIAL_DO_RESTART 36 37 /* Set of debugging defines */ 38 39 #undef SERIAL_DEBUG_INTR 40 #undef SERIAL_DEBUG_OPEN 41 #undef SERIAL_DEBUG_FLOW 42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 43 44 /* Sanity checks */ 45 46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) 47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ 48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s) 49 #else 50 #define DBG_CNT(s) 51 #endif 52 53 /* 54 * End of serial driver configuration section. 55 */ 56 57 #include <linux/module.h> 58 59 #include <linux/types.h> 60 #include <linux/serial.h> 61 #include <linux/serial_reg.h> 62 static char *serial_version = "4.30"; 63 64 #include <linux/errno.h> 65 #include <linux/signal.h> 66 #include <linux/sched.h> 67 #include <linux/kernel.h> 68 #include <linux/timer.h> 69 #include <linux/interrupt.h> 70 #include <linux/tty.h> 71 #include <linux/tty_flip.h> 72 #include <linux/circ_buf.h> 73 #include <linux/console.h> 74 #include <linux/major.h> 75 #include <linux/string.h> 76 #include <linux/fcntl.h> 77 #include <linux/ptrace.h> 78 #include <linux/ioport.h> 79 #include <linux/mm.h> 80 #include <linux/seq_file.h> 81 #include <linux/slab.h> 82 #include <linux/init.h> 83 #include <linux/bitops.h> 84 #include <linux/platform_device.h> 85 86 #include <asm/setup.h> 87 88 89 #include <asm/irq.h> 90 91 #include <asm/amigahw.h> 92 #include <asm/amigaints.h> 93 94 struct serial_state { 95 struct tty_port tport; 96 struct circ_buf xmit; 97 struct async_icount icount; 98 99 unsigned long port; 100 int baud_base; 101 int xmit_fifo_size; 102 int custom_divisor; 103 int read_status_mask; 104 int ignore_status_mask; 105 int timeout; 106 int quot; 107 int IER; /* Interrupt Enable Register */ 108 int MCR; /* Modem control register */ 109 int x_char; /* xon/xoff character */ 110 }; 111 112 #define custom amiga_custom 113 static char *serial_name = "Amiga-builtin serial driver"; 114 115 static struct tty_driver *serial_driver; 116 117 /* number of characters left in xmit buffer before we ask for more */ 118 #define WAKEUP_CHARS 256 119 120 static unsigned char current_ctl_bits; 121 122 static void change_speed(struct tty_struct *tty, struct serial_state *info, 123 struct ktermios *old); 124 static void rs_wait_until_sent(struct tty_struct *tty, int timeout); 125 126 127 static struct serial_state rs_table[1]; 128 129 #define NR_PORTS ARRAY_SIZE(rs_table) 130 131 #include <asm/uaccess.h> 132 133 #define serial_isroot() (capable(CAP_SYS_ADMIN)) 134 135 136 static inline int serial_paranoia_check(struct serial_state *info, 137 char *name, const char *routine) 138 { 139 #ifdef SERIAL_PARANOIA_CHECK 140 static const char *badmagic = 141 "Warning: bad magic number for serial struct (%s) in %s\n"; 142 static const char *badinfo = 143 "Warning: null async_struct for (%s) in %s\n"; 144 145 if (!info) { 146 printk(badinfo, name, routine); 147 return 1; 148 } 149 if (info->magic != SERIAL_MAGIC) { 150 printk(badmagic, name, routine); 151 return 1; 152 } 153 #endif 154 return 0; 155 } 156 157 /* some serial hardware definitions */ 158 #define SDR_OVRUN (1<<15) 159 #define SDR_RBF (1<<14) 160 #define SDR_TBE (1<<13) 161 #define SDR_TSRE (1<<12) 162 163 #define SERPER_PARENB (1<<15) 164 165 #define AC_SETCLR (1<<15) 166 #define AC_UARTBRK (1<<11) 167 168 #define SER_DTR (1<<7) 169 #define SER_RTS (1<<6) 170 #define SER_DCD (1<<5) 171 #define SER_CTS (1<<4) 172 #define SER_DSR (1<<3) 173 174 static __inline__ void rtsdtr_ctrl(int bits) 175 { 176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); 177 } 178 179 /* 180 * ------------------------------------------------------------ 181 * rs_stop() and rs_start() 182 * 183 * This routines are called before setting or resetting tty->stopped. 184 * They enable or disable transmitter interrupts, as necessary. 185 * ------------------------------------------------------------ 186 */ 187 static void rs_stop(struct tty_struct *tty) 188 { 189 struct serial_state *info = tty->driver_data; 190 unsigned long flags; 191 192 if (serial_paranoia_check(info, tty->name, "rs_stop")) 193 return; 194 195 local_irq_save(flags); 196 if (info->IER & UART_IER_THRI) { 197 info->IER &= ~UART_IER_THRI; 198 /* disable Tx interrupt and remove any pending interrupts */ 199 custom.intena = IF_TBE; 200 mb(); 201 custom.intreq = IF_TBE; 202 mb(); 203 } 204 local_irq_restore(flags); 205 } 206 207 static void rs_start(struct tty_struct *tty) 208 { 209 struct serial_state *info = tty->driver_data; 210 unsigned long flags; 211 212 if (serial_paranoia_check(info, tty->name, "rs_start")) 213 return; 214 215 local_irq_save(flags); 216 if (info->xmit.head != info->xmit.tail 217 && info->xmit.buf 218 && !(info->IER & UART_IER_THRI)) { 219 info->IER |= UART_IER_THRI; 220 custom.intena = IF_SETCLR | IF_TBE; 221 mb(); 222 /* set a pending Tx Interrupt, transmitter should restart now */ 223 custom.intreq = IF_SETCLR | IF_TBE; 224 mb(); 225 } 226 local_irq_restore(flags); 227 } 228 229 /* 230 * ---------------------------------------------------------------------- 231 * 232 * Here starts the interrupt handling routines. All of the following 233 * subroutines are declared as inline and are folded into 234 * rs_interrupt(). They were separated out for readability's sake. 235 * 236 * Note: rs_interrupt() is a "fast" interrupt, which means that it 237 * runs with interrupts turned off. People who may want to modify 238 * rs_interrupt() should try to keep the interrupt handler as fast as 239 * possible. After you are done making modifications, it is not a bad 240 * idea to do: 241 * 242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c 243 * 244 * and look at the resulting assemble code in serial.s. 245 * 246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 247 * ----------------------------------------------------------------------- 248 */ 249 250 static void receive_chars(struct serial_state *info) 251 { 252 int status; 253 int serdatr; 254 struct tty_struct *tty = info->tport.tty; 255 unsigned char ch, flag; 256 struct async_icount *icount; 257 int oe = 0; 258 259 icount = &info->icount; 260 261 status = UART_LSR_DR; /* We obviously have a character! */ 262 serdatr = custom.serdatr; 263 mb(); 264 custom.intreq = IF_RBF; 265 mb(); 266 267 if((serdatr & 0x1ff) == 0) 268 status |= UART_LSR_BI; 269 if(serdatr & SDR_OVRUN) 270 status |= UART_LSR_OE; 271 272 ch = serdatr & 0xff; 273 icount->rx++; 274 275 #ifdef SERIAL_DEBUG_INTR 276 printk("DR%02x:%02x...", ch, status); 277 #endif 278 flag = TTY_NORMAL; 279 280 /* 281 * We don't handle parity or frame errors - but I have left 282 * the code in, since I'm not sure that the errors can't be 283 * detected. 284 */ 285 286 if (status & (UART_LSR_BI | UART_LSR_PE | 287 UART_LSR_FE | UART_LSR_OE)) { 288 /* 289 * For statistics only 290 */ 291 if (status & UART_LSR_BI) { 292 status &= ~(UART_LSR_FE | UART_LSR_PE); 293 icount->brk++; 294 } else if (status & UART_LSR_PE) 295 icount->parity++; 296 else if (status & UART_LSR_FE) 297 icount->frame++; 298 if (status & UART_LSR_OE) 299 icount->overrun++; 300 301 /* 302 * Now check to see if character should be 303 * ignored, and mask off conditions which 304 * should be ignored. 305 */ 306 if (status & info->ignore_status_mask) 307 goto out; 308 309 status &= info->read_status_mask; 310 311 if (status & (UART_LSR_BI)) { 312 #ifdef SERIAL_DEBUG_INTR 313 printk("handling break...."); 314 #endif 315 flag = TTY_BREAK; 316 if (info->tport.flags & ASYNC_SAK) 317 do_SAK(tty); 318 } else if (status & UART_LSR_PE) 319 flag = TTY_PARITY; 320 else if (status & UART_LSR_FE) 321 flag = TTY_FRAME; 322 if (status & UART_LSR_OE) { 323 /* 324 * Overrun is special, since it's 325 * reported immediately, and doesn't 326 * affect the current character 327 */ 328 oe = 1; 329 } 330 } 331 tty_insert_flip_char(tty, ch, flag); 332 if (oe == 1) 333 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 334 tty_flip_buffer_push(tty); 335 out: 336 return; 337 } 338 339 static void transmit_chars(struct serial_state *info) 340 { 341 custom.intreq = IF_TBE; 342 mb(); 343 if (info->x_char) { 344 custom.serdat = info->x_char | 0x100; 345 mb(); 346 info->icount.tx++; 347 info->x_char = 0; 348 return; 349 } 350 if (info->xmit.head == info->xmit.tail 351 || info->tport.tty->stopped 352 || info->tport.tty->hw_stopped) { 353 info->IER &= ~UART_IER_THRI; 354 custom.intena = IF_TBE; 355 mb(); 356 return; 357 } 358 359 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; 360 mb(); 361 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); 362 info->icount.tx++; 363 364 if (CIRC_CNT(info->xmit.head, 365 info->xmit.tail, 366 SERIAL_XMIT_SIZE) < WAKEUP_CHARS) 367 tty_wakeup(info->tport.tty); 368 369 #ifdef SERIAL_DEBUG_INTR 370 printk("THRE..."); 371 #endif 372 if (info->xmit.head == info->xmit.tail) { 373 custom.intena = IF_TBE; 374 mb(); 375 info->IER &= ~UART_IER_THRI; 376 } 377 } 378 379 static void check_modem_status(struct serial_state *info) 380 { 381 struct tty_port *port = &info->tport; 382 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 383 unsigned char dstatus; 384 struct async_icount *icount; 385 386 /* Determine bits that have changed */ 387 dstatus = status ^ current_ctl_bits; 388 current_ctl_bits = status; 389 390 if (dstatus) { 391 icount = &info->icount; 392 /* update input line counters */ 393 if (dstatus & SER_DSR) 394 icount->dsr++; 395 if (dstatus & SER_DCD) { 396 icount->dcd++; 397 #ifdef CONFIG_HARD_PPS 398 if ((port->flags & ASYNC_HARDPPS_CD) && 399 !(status & SER_DCD)) 400 hardpps(); 401 #endif 402 } 403 if (dstatus & SER_CTS) 404 icount->cts++; 405 wake_up_interruptible(&port->delta_msr_wait); 406 } 407 408 if ((port->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) { 409 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) 410 printk("ttyS%d CD now %s...", info->line, 411 (!(status & SER_DCD)) ? "on" : "off"); 412 #endif 413 if (!(status & SER_DCD)) 414 wake_up_interruptible(&port->open_wait); 415 else { 416 #ifdef SERIAL_DEBUG_OPEN 417 printk("doing serial hangup..."); 418 #endif 419 if (port->tty) 420 tty_hangup(port->tty); 421 } 422 } 423 if (tty_port_cts_enabled(port)) { 424 if (port->tty->hw_stopped) { 425 if (!(status & SER_CTS)) { 426 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 427 printk("CTS tx start..."); 428 #endif 429 port->tty->hw_stopped = 0; 430 info->IER |= UART_IER_THRI; 431 custom.intena = IF_SETCLR | IF_TBE; 432 mb(); 433 /* set a pending Tx Interrupt, transmitter should restart now */ 434 custom.intreq = IF_SETCLR | IF_TBE; 435 mb(); 436 tty_wakeup(port->tty); 437 return; 438 } 439 } else { 440 if ((status & SER_CTS)) { 441 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 442 printk("CTS tx stop..."); 443 #endif 444 port->tty->hw_stopped = 1; 445 info->IER &= ~UART_IER_THRI; 446 /* disable Tx interrupt and remove any pending interrupts */ 447 custom.intena = IF_TBE; 448 mb(); 449 custom.intreq = IF_TBE; 450 mb(); 451 } 452 } 453 } 454 } 455 456 static irqreturn_t ser_vbl_int( int irq, void *data) 457 { 458 /* vbl is just a periodic interrupt we tie into to update modem status */ 459 struct serial_state *info = data; 460 /* 461 * TBD - is it better to unregister from this interrupt or to 462 * ignore it if MSI is clear ? 463 */ 464 if(info->IER & UART_IER_MSI) 465 check_modem_status(info); 466 return IRQ_HANDLED; 467 } 468 469 static irqreturn_t ser_rx_int(int irq, void *dev_id) 470 { 471 struct serial_state *info = dev_id; 472 473 #ifdef SERIAL_DEBUG_INTR 474 printk("ser_rx_int..."); 475 #endif 476 477 if (!info->tport.tty) 478 return IRQ_NONE; 479 480 receive_chars(info); 481 #ifdef SERIAL_DEBUG_INTR 482 printk("end.\n"); 483 #endif 484 return IRQ_HANDLED; 485 } 486 487 static irqreturn_t ser_tx_int(int irq, void *dev_id) 488 { 489 struct serial_state *info = dev_id; 490 491 if (custom.serdatr & SDR_TBE) { 492 #ifdef SERIAL_DEBUG_INTR 493 printk("ser_tx_int..."); 494 #endif 495 496 if (!info->tport.tty) 497 return IRQ_NONE; 498 499 transmit_chars(info); 500 #ifdef SERIAL_DEBUG_INTR 501 printk("end.\n"); 502 #endif 503 } 504 return IRQ_HANDLED; 505 } 506 507 /* 508 * ------------------------------------------------------------------- 509 * Here ends the serial interrupt routines. 510 * ------------------------------------------------------------------- 511 */ 512 513 /* 514 * --------------------------------------------------------------- 515 * Low level utility subroutines for the serial driver: routines to 516 * figure out the appropriate timeout for an interrupt chain, routines 517 * to initialize and startup a serial port, and routines to shutdown a 518 * serial port. Useful stuff like that. 519 * --------------------------------------------------------------- 520 */ 521 522 static int startup(struct tty_struct *tty, struct serial_state *info) 523 { 524 struct tty_port *port = &info->tport; 525 unsigned long flags; 526 int retval=0; 527 unsigned long page; 528 529 page = get_zeroed_page(GFP_KERNEL); 530 if (!page) 531 return -ENOMEM; 532 533 local_irq_save(flags); 534 535 if (port->flags & ASYNC_INITIALIZED) { 536 free_page(page); 537 goto errout; 538 } 539 540 if (info->xmit.buf) 541 free_page(page); 542 else 543 info->xmit.buf = (unsigned char *) page; 544 545 #ifdef SERIAL_DEBUG_OPEN 546 printk("starting up ttys%d ...", info->line); 547 #endif 548 549 /* Clear anything in the input buffer */ 550 551 custom.intreq = IF_RBF; 552 mb(); 553 554 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); 555 if (retval) { 556 if (serial_isroot()) { 557 set_bit(TTY_IO_ERROR, &tty->flags); 558 retval = 0; 559 } 560 goto errout; 561 } 562 563 /* enable both Rx and Tx interrupts */ 564 custom.intena = IF_SETCLR | IF_RBF | IF_TBE; 565 mb(); 566 info->IER = UART_IER_MSI; 567 568 /* remember current state of the DCD and CTS bits */ 569 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 570 571 info->MCR = 0; 572 if (C_BAUD(tty)) 573 info->MCR = SER_DTR | SER_RTS; 574 rtsdtr_ctrl(info->MCR); 575 576 clear_bit(TTY_IO_ERROR, &tty->flags); 577 info->xmit.head = info->xmit.tail = 0; 578 579 /* 580 * Set up the tty->alt_speed kludge 581 */ 582 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 583 tty->alt_speed = 57600; 584 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 585 tty->alt_speed = 115200; 586 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 587 tty->alt_speed = 230400; 588 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 589 tty->alt_speed = 460800; 590 591 /* 592 * and set the speed of the serial port 593 */ 594 change_speed(tty, info, NULL); 595 596 port->flags |= ASYNC_INITIALIZED; 597 local_irq_restore(flags); 598 return 0; 599 600 errout: 601 local_irq_restore(flags); 602 return retval; 603 } 604 605 /* 606 * This routine will shutdown a serial port; interrupts are disabled, and 607 * DTR is dropped if the hangup on close termio flag is on. 608 */ 609 static void shutdown(struct tty_struct *tty, struct serial_state *info) 610 { 611 unsigned long flags; 612 struct serial_state *state; 613 614 if (!(info->tport.flags & ASYNC_INITIALIZED)) 615 return; 616 617 state = info; 618 619 #ifdef SERIAL_DEBUG_OPEN 620 printk("Shutting down serial port %d ....\n", info->line); 621 #endif 622 623 local_irq_save(flags); /* Disable interrupts */ 624 625 /* 626 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 627 * here so the queue might never be waken up 628 */ 629 wake_up_interruptible(&info->tport.delta_msr_wait); 630 631 /* 632 * Free the IRQ, if necessary 633 */ 634 free_irq(IRQ_AMIGA_VERTB, info); 635 636 if (info->xmit.buf) { 637 free_page((unsigned long) info->xmit.buf); 638 info->xmit.buf = NULL; 639 } 640 641 info->IER = 0; 642 custom.intena = IF_RBF | IF_TBE; 643 mb(); 644 645 /* disable break condition */ 646 custom.adkcon = AC_UARTBRK; 647 mb(); 648 649 if (tty->termios.c_cflag & HUPCL) 650 info->MCR &= ~(SER_DTR|SER_RTS); 651 rtsdtr_ctrl(info->MCR); 652 653 set_bit(TTY_IO_ERROR, &tty->flags); 654 655 info->tport.flags &= ~ASYNC_INITIALIZED; 656 local_irq_restore(flags); 657 } 658 659 660 /* 661 * This routine is called to set the UART divisor registers to match 662 * the specified baud rate for a serial port. 663 */ 664 static void change_speed(struct tty_struct *tty, struct serial_state *info, 665 struct ktermios *old_termios) 666 { 667 struct tty_port *port = &info->tport; 668 int quot = 0, baud_base, baud; 669 unsigned cflag, cval = 0; 670 int bits; 671 unsigned long flags; 672 673 cflag = tty->termios.c_cflag; 674 675 /* Byte size is always 8 bits plus parity bit if requested */ 676 677 cval = 3; bits = 10; 678 if (cflag & CSTOPB) { 679 cval |= 0x04; 680 bits++; 681 } 682 if (cflag & PARENB) { 683 cval |= UART_LCR_PARITY; 684 bits++; 685 } 686 if (!(cflag & PARODD)) 687 cval |= UART_LCR_EPAR; 688 #ifdef CMSPAR 689 if (cflag & CMSPAR) 690 cval |= UART_LCR_SPAR; 691 #endif 692 693 /* Determine divisor based on baud rate */ 694 baud = tty_get_baud_rate(tty); 695 if (!baud) 696 baud = 9600; /* B0 transition handled in rs_set_termios */ 697 baud_base = info->baud_base; 698 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 699 quot = info->custom_divisor; 700 else { 701 if (baud == 134) 702 /* Special case since 134 is really 134.5 */ 703 quot = (2*baud_base / 269); 704 else if (baud) 705 quot = baud_base / baud; 706 } 707 /* If the quotient is zero refuse the change */ 708 if (!quot && old_termios) { 709 /* FIXME: Will need updating for new tty in the end */ 710 tty->termios.c_cflag &= ~CBAUD; 711 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 712 baud = tty_get_baud_rate(tty); 713 if (!baud) 714 baud = 9600; 715 if (baud == 38400 && 716 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 717 quot = info->custom_divisor; 718 else { 719 if (baud == 134) 720 /* Special case since 134 is really 134.5 */ 721 quot = (2*baud_base / 269); 722 else if (baud) 723 quot = baud_base / baud; 724 } 725 } 726 /* As a last resort, if the quotient is zero, default to 9600 bps */ 727 if (!quot) 728 quot = baud_base / 9600; 729 info->quot = quot; 730 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); 731 info->timeout += HZ/50; /* Add .02 seconds of slop */ 732 733 /* CTS flow control flag and modem status interrupts */ 734 info->IER &= ~UART_IER_MSI; 735 if (port->flags & ASYNC_HARDPPS_CD) 736 info->IER |= UART_IER_MSI; 737 if (cflag & CRTSCTS) { 738 port->flags |= ASYNC_CTS_FLOW; 739 info->IER |= UART_IER_MSI; 740 } else 741 port->flags &= ~ASYNC_CTS_FLOW; 742 if (cflag & CLOCAL) 743 port->flags &= ~ASYNC_CHECK_CD; 744 else { 745 port->flags |= ASYNC_CHECK_CD; 746 info->IER |= UART_IER_MSI; 747 } 748 /* TBD: 749 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 750 */ 751 752 /* 753 * Set up parity check flag 754 */ 755 756 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 757 if (I_INPCK(tty)) 758 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 759 if (I_BRKINT(tty) || I_PARMRK(tty)) 760 info->read_status_mask |= UART_LSR_BI; 761 762 /* 763 * Characters to ignore 764 */ 765 info->ignore_status_mask = 0; 766 if (I_IGNPAR(tty)) 767 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 768 if (I_IGNBRK(tty)) { 769 info->ignore_status_mask |= UART_LSR_BI; 770 /* 771 * If we're ignore parity and break indicators, ignore 772 * overruns too. (For real raw support). 773 */ 774 if (I_IGNPAR(tty)) 775 info->ignore_status_mask |= UART_LSR_OE; 776 } 777 /* 778 * !!! ignore all characters if CREAD is not set 779 */ 780 if ((cflag & CREAD) == 0) 781 info->ignore_status_mask |= UART_LSR_DR; 782 local_irq_save(flags); 783 784 { 785 short serper; 786 787 /* Set up the baud rate */ 788 serper = quot - 1; 789 790 /* Enable or disable parity bit */ 791 792 if(cval & UART_LCR_PARITY) 793 serper |= (SERPER_PARENB); 794 795 custom.serper = serper; 796 mb(); 797 } 798 799 local_irq_restore(flags); 800 } 801 802 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 803 { 804 struct serial_state *info; 805 unsigned long flags; 806 807 info = tty->driver_data; 808 809 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 810 return 0; 811 812 if (!info->xmit.buf) 813 return 0; 814 815 local_irq_save(flags); 816 if (CIRC_SPACE(info->xmit.head, 817 info->xmit.tail, 818 SERIAL_XMIT_SIZE) == 0) { 819 local_irq_restore(flags); 820 return 0; 821 } 822 823 info->xmit.buf[info->xmit.head++] = ch; 824 info->xmit.head &= SERIAL_XMIT_SIZE-1; 825 local_irq_restore(flags); 826 return 1; 827 } 828 829 static void rs_flush_chars(struct tty_struct *tty) 830 { 831 struct serial_state *info = tty->driver_data; 832 unsigned long flags; 833 834 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 835 return; 836 837 if (info->xmit.head == info->xmit.tail 838 || tty->stopped 839 || tty->hw_stopped 840 || !info->xmit.buf) 841 return; 842 843 local_irq_save(flags); 844 info->IER |= UART_IER_THRI; 845 custom.intena = IF_SETCLR | IF_TBE; 846 mb(); 847 /* set a pending Tx Interrupt, transmitter should restart now */ 848 custom.intreq = IF_SETCLR | IF_TBE; 849 mb(); 850 local_irq_restore(flags); 851 } 852 853 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 854 { 855 int c, ret = 0; 856 struct serial_state *info = tty->driver_data; 857 unsigned long flags; 858 859 if (serial_paranoia_check(info, tty->name, "rs_write")) 860 return 0; 861 862 if (!info->xmit.buf) 863 return 0; 864 865 local_irq_save(flags); 866 while (1) { 867 c = CIRC_SPACE_TO_END(info->xmit.head, 868 info->xmit.tail, 869 SERIAL_XMIT_SIZE); 870 if (count < c) 871 c = count; 872 if (c <= 0) { 873 break; 874 } 875 memcpy(info->xmit.buf + info->xmit.head, buf, c); 876 info->xmit.head = ((info->xmit.head + c) & 877 (SERIAL_XMIT_SIZE-1)); 878 buf += c; 879 count -= c; 880 ret += c; 881 } 882 local_irq_restore(flags); 883 884 if (info->xmit.head != info->xmit.tail 885 && !tty->stopped 886 && !tty->hw_stopped 887 && !(info->IER & UART_IER_THRI)) { 888 info->IER |= UART_IER_THRI; 889 local_irq_disable(); 890 custom.intena = IF_SETCLR | IF_TBE; 891 mb(); 892 /* set a pending Tx Interrupt, transmitter should restart now */ 893 custom.intreq = IF_SETCLR | IF_TBE; 894 mb(); 895 local_irq_restore(flags); 896 } 897 return ret; 898 } 899 900 static int rs_write_room(struct tty_struct *tty) 901 { 902 struct serial_state *info = tty->driver_data; 903 904 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 905 return 0; 906 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 907 } 908 909 static int rs_chars_in_buffer(struct tty_struct *tty) 910 { 911 struct serial_state *info = tty->driver_data; 912 913 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 914 return 0; 915 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 916 } 917 918 static void rs_flush_buffer(struct tty_struct *tty) 919 { 920 struct serial_state *info = tty->driver_data; 921 unsigned long flags; 922 923 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 924 return; 925 local_irq_save(flags); 926 info->xmit.head = info->xmit.tail = 0; 927 local_irq_restore(flags); 928 tty_wakeup(tty); 929 } 930 931 /* 932 * This function is used to send a high-priority XON/XOFF character to 933 * the device 934 */ 935 static void rs_send_xchar(struct tty_struct *tty, char ch) 936 { 937 struct serial_state *info = tty->driver_data; 938 unsigned long flags; 939 940 if (serial_paranoia_check(info, tty->name, "rs_send_char")) 941 return; 942 943 info->x_char = ch; 944 if (ch) { 945 /* Make sure transmit interrupts are on */ 946 947 /* Check this ! */ 948 local_irq_save(flags); 949 if(!(custom.intenar & IF_TBE)) { 950 custom.intena = IF_SETCLR | IF_TBE; 951 mb(); 952 /* set a pending Tx Interrupt, transmitter should restart now */ 953 custom.intreq = IF_SETCLR | IF_TBE; 954 mb(); 955 } 956 local_irq_restore(flags); 957 958 info->IER |= UART_IER_THRI; 959 } 960 } 961 962 /* 963 * ------------------------------------------------------------ 964 * rs_throttle() 965 * 966 * This routine is called by the upper-layer tty layer to signal that 967 * incoming characters should be throttled. 968 * ------------------------------------------------------------ 969 */ 970 static void rs_throttle(struct tty_struct * tty) 971 { 972 struct serial_state *info = tty->driver_data; 973 unsigned long flags; 974 #ifdef SERIAL_DEBUG_THROTTLE 975 char buf[64]; 976 977 printk("throttle %s: %d....\n", tty_name(tty, buf), 978 tty->ldisc.chars_in_buffer(tty)); 979 #endif 980 981 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 982 return; 983 984 if (I_IXOFF(tty)) 985 rs_send_xchar(tty, STOP_CHAR(tty)); 986 987 if (tty->termios.c_cflag & CRTSCTS) 988 info->MCR &= ~SER_RTS; 989 990 local_irq_save(flags); 991 rtsdtr_ctrl(info->MCR); 992 local_irq_restore(flags); 993 } 994 995 static void rs_unthrottle(struct tty_struct * tty) 996 { 997 struct serial_state *info = tty->driver_data; 998 unsigned long flags; 999 #ifdef SERIAL_DEBUG_THROTTLE 1000 char buf[64]; 1001 1002 printk("unthrottle %s: %d....\n", tty_name(tty, buf), 1003 tty->ldisc.chars_in_buffer(tty)); 1004 #endif 1005 1006 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 1007 return; 1008 1009 if (I_IXOFF(tty)) { 1010 if (info->x_char) 1011 info->x_char = 0; 1012 else 1013 rs_send_xchar(tty, START_CHAR(tty)); 1014 } 1015 if (tty->termios.c_cflag & CRTSCTS) 1016 info->MCR |= SER_RTS; 1017 local_irq_save(flags); 1018 rtsdtr_ctrl(info->MCR); 1019 local_irq_restore(flags); 1020 } 1021 1022 /* 1023 * ------------------------------------------------------------ 1024 * rs_ioctl() and friends 1025 * ------------------------------------------------------------ 1026 */ 1027 1028 static int get_serial_info(struct tty_struct *tty, struct serial_state *state, 1029 struct serial_struct __user * retinfo) 1030 { 1031 struct serial_struct tmp; 1032 1033 if (!retinfo) 1034 return -EFAULT; 1035 memset(&tmp, 0, sizeof(tmp)); 1036 tty_lock(tty); 1037 tmp.line = tty->index; 1038 tmp.port = state->port; 1039 tmp.flags = state->tport.flags; 1040 tmp.xmit_fifo_size = state->xmit_fifo_size; 1041 tmp.baud_base = state->baud_base; 1042 tmp.close_delay = state->tport.close_delay; 1043 tmp.closing_wait = state->tport.closing_wait; 1044 tmp.custom_divisor = state->custom_divisor; 1045 tty_unlock(tty); 1046 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo))) 1047 return -EFAULT; 1048 return 0; 1049 } 1050 1051 static int set_serial_info(struct tty_struct *tty, struct serial_state *state, 1052 struct serial_struct __user * new_info) 1053 { 1054 struct tty_port *port = &state->tport; 1055 struct serial_struct new_serial; 1056 bool change_spd; 1057 int retval = 0; 1058 1059 if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) 1060 return -EFAULT; 1061 1062 tty_lock(tty); 1063 change_spd = ((new_serial.flags ^ port->flags) & ASYNC_SPD_MASK) || 1064 new_serial.custom_divisor != state->custom_divisor; 1065 if (new_serial.irq || new_serial.port != state->port || 1066 new_serial.xmit_fifo_size != state->xmit_fifo_size) { 1067 tty_unlock(tty); 1068 return -EINVAL; 1069 } 1070 1071 if (!serial_isroot()) { 1072 if ((new_serial.baud_base != state->baud_base) || 1073 (new_serial.close_delay != port->close_delay) || 1074 (new_serial.xmit_fifo_size != state->xmit_fifo_size) || 1075 ((new_serial.flags & ~ASYNC_USR_MASK) != 1076 (port->flags & ~ASYNC_USR_MASK))) { 1077 tty_unlock(tty); 1078 return -EPERM; 1079 } 1080 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1081 (new_serial.flags & ASYNC_USR_MASK)); 1082 state->custom_divisor = new_serial.custom_divisor; 1083 goto check_and_exit; 1084 } 1085 1086 if (new_serial.baud_base < 9600) { 1087 tty_unlock(tty); 1088 return -EINVAL; 1089 } 1090 1091 /* 1092 * OK, past this point, all the error checking has been done. 1093 * At this point, we start making changes..... 1094 */ 1095 1096 state->baud_base = new_serial.baud_base; 1097 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1098 (new_serial.flags & ASYNC_FLAGS)); 1099 state->custom_divisor = new_serial.custom_divisor; 1100 port->close_delay = new_serial.close_delay * HZ/100; 1101 port->closing_wait = new_serial.closing_wait * HZ/100; 1102 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1103 1104 check_and_exit: 1105 if (port->flags & ASYNC_INITIALIZED) { 1106 if (change_spd) { 1107 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 1108 tty->alt_speed = 57600; 1109 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 1110 tty->alt_speed = 115200; 1111 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 1112 tty->alt_speed = 230400; 1113 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 1114 tty->alt_speed = 460800; 1115 change_speed(tty, state, NULL); 1116 } 1117 } else 1118 retval = startup(tty, state); 1119 tty_unlock(tty); 1120 return retval; 1121 } 1122 1123 1124 /* 1125 * get_lsr_info - get line status register info 1126 * 1127 * Purpose: Let user call ioctl() to get info when the UART physically 1128 * is emptied. On bus types like RS485, the transmitter must 1129 * release the bus after transmitting. This must be done when 1130 * the transmit shift register is empty, not be done when the 1131 * transmit holding register is empty. This functionality 1132 * allows an RS485 driver to be written in user space. 1133 */ 1134 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1135 { 1136 unsigned char status; 1137 unsigned int result; 1138 unsigned long flags; 1139 1140 local_irq_save(flags); 1141 status = custom.serdatr; 1142 mb(); 1143 local_irq_restore(flags); 1144 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1145 if (copy_to_user(value, &result, sizeof(int))) 1146 return -EFAULT; 1147 return 0; 1148 } 1149 1150 1151 static int rs_tiocmget(struct tty_struct *tty) 1152 { 1153 struct serial_state *info = tty->driver_data; 1154 unsigned char control, status; 1155 unsigned long flags; 1156 1157 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1158 return -ENODEV; 1159 if (tty->flags & (1 << TTY_IO_ERROR)) 1160 return -EIO; 1161 1162 control = info->MCR; 1163 local_irq_save(flags); 1164 status = ciab.pra; 1165 local_irq_restore(flags); 1166 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1167 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1168 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1169 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1170 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1171 } 1172 1173 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1174 unsigned int clear) 1175 { 1176 struct serial_state *info = tty->driver_data; 1177 unsigned long flags; 1178 1179 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1180 return -ENODEV; 1181 if (tty->flags & (1 << TTY_IO_ERROR)) 1182 return -EIO; 1183 1184 local_irq_save(flags); 1185 if (set & TIOCM_RTS) 1186 info->MCR |= SER_RTS; 1187 if (set & TIOCM_DTR) 1188 info->MCR |= SER_DTR; 1189 if (clear & TIOCM_RTS) 1190 info->MCR &= ~SER_RTS; 1191 if (clear & TIOCM_DTR) 1192 info->MCR &= ~SER_DTR; 1193 rtsdtr_ctrl(info->MCR); 1194 local_irq_restore(flags); 1195 return 0; 1196 } 1197 1198 /* 1199 * rs_break() --- routine which turns the break handling on or off 1200 */ 1201 static int rs_break(struct tty_struct *tty, int break_state) 1202 { 1203 struct serial_state *info = tty->driver_data; 1204 unsigned long flags; 1205 1206 if (serial_paranoia_check(info, tty->name, "rs_break")) 1207 return -EINVAL; 1208 1209 local_irq_save(flags); 1210 if (break_state == -1) 1211 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1212 else 1213 custom.adkcon = AC_UARTBRK; 1214 mb(); 1215 local_irq_restore(flags); 1216 return 0; 1217 } 1218 1219 /* 1220 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1221 * Return: write counters to the user passed counter struct 1222 * NB: both 1->0 and 0->1 transitions are counted except for 1223 * RI where only 0->1 is counted. 1224 */ 1225 static int rs_get_icount(struct tty_struct *tty, 1226 struct serial_icounter_struct *icount) 1227 { 1228 struct serial_state *info = tty->driver_data; 1229 struct async_icount cnow; 1230 unsigned long flags; 1231 1232 local_irq_save(flags); 1233 cnow = info->icount; 1234 local_irq_restore(flags); 1235 icount->cts = cnow.cts; 1236 icount->dsr = cnow.dsr; 1237 icount->rng = cnow.rng; 1238 icount->dcd = cnow.dcd; 1239 icount->rx = cnow.rx; 1240 icount->tx = cnow.tx; 1241 icount->frame = cnow.frame; 1242 icount->overrun = cnow.overrun; 1243 icount->parity = cnow.parity; 1244 icount->brk = cnow.brk; 1245 icount->buf_overrun = cnow.buf_overrun; 1246 1247 return 0; 1248 } 1249 1250 static int rs_ioctl(struct tty_struct *tty, 1251 unsigned int cmd, unsigned long arg) 1252 { 1253 struct serial_state *info = tty->driver_data; 1254 struct async_icount cprev, cnow; /* kernel counter temps */ 1255 void __user *argp = (void __user *)arg; 1256 unsigned long flags; 1257 1258 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1259 return -ENODEV; 1260 1261 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && 1262 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1263 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1264 if (tty->flags & (1 << TTY_IO_ERROR)) 1265 return -EIO; 1266 } 1267 1268 switch (cmd) { 1269 case TIOCGSERIAL: 1270 return get_serial_info(tty, info, argp); 1271 case TIOCSSERIAL: 1272 return set_serial_info(tty, info, argp); 1273 case TIOCSERCONFIG: 1274 return 0; 1275 1276 case TIOCSERGETLSR: /* Get line status register */ 1277 return get_lsr_info(info, argp); 1278 1279 case TIOCSERGSTRUCT: 1280 if (copy_to_user(argp, 1281 info, sizeof(struct serial_state))) 1282 return -EFAULT; 1283 return 0; 1284 1285 /* 1286 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1287 * - mask passed in arg for lines of interest 1288 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1289 * Caller should use TIOCGICOUNT to see which one it was 1290 */ 1291 case TIOCMIWAIT: 1292 local_irq_save(flags); 1293 /* note the counters on entry */ 1294 cprev = info->icount; 1295 local_irq_restore(flags); 1296 while (1) { 1297 interruptible_sleep_on(&info->tport.delta_msr_wait); 1298 /* see if a signal did it */ 1299 if (signal_pending(current)) 1300 return -ERESTARTSYS; 1301 local_irq_save(flags); 1302 cnow = info->icount; /* atomic copy */ 1303 local_irq_restore(flags); 1304 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1305 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) 1306 return -EIO; /* no change => error */ 1307 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1308 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1309 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1310 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1311 return 0; 1312 } 1313 cprev = cnow; 1314 } 1315 /* NOTREACHED */ 1316 1317 case TIOCSERGWILD: 1318 case TIOCSERSWILD: 1319 /* "setserial -W" is called in Debian boot */ 1320 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1321 return 0; 1322 1323 default: 1324 return -ENOIOCTLCMD; 1325 } 1326 return 0; 1327 } 1328 1329 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1330 { 1331 struct serial_state *info = tty->driver_data; 1332 unsigned long flags; 1333 unsigned int cflag = tty->termios.c_cflag; 1334 1335 change_speed(tty, info, old_termios); 1336 1337 /* Handle transition to B0 status */ 1338 if ((old_termios->c_cflag & CBAUD) && 1339 !(cflag & CBAUD)) { 1340 info->MCR &= ~(SER_DTR|SER_RTS); 1341 local_irq_save(flags); 1342 rtsdtr_ctrl(info->MCR); 1343 local_irq_restore(flags); 1344 } 1345 1346 /* Handle transition away from B0 status */ 1347 if (!(old_termios->c_cflag & CBAUD) && 1348 (cflag & CBAUD)) { 1349 info->MCR |= SER_DTR; 1350 if (!(tty->termios.c_cflag & CRTSCTS) || 1351 !test_bit(TTY_THROTTLED, &tty->flags)) { 1352 info->MCR |= SER_RTS; 1353 } 1354 local_irq_save(flags); 1355 rtsdtr_ctrl(info->MCR); 1356 local_irq_restore(flags); 1357 } 1358 1359 /* Handle turning off CRTSCTS */ 1360 if ((old_termios->c_cflag & CRTSCTS) && 1361 !(tty->termios.c_cflag & CRTSCTS)) { 1362 tty->hw_stopped = 0; 1363 rs_start(tty); 1364 } 1365 1366 #if 0 1367 /* 1368 * No need to wake up processes in open wait, since they 1369 * sample the CLOCAL flag once, and don't recheck it. 1370 * XXX It's not clear whether the current behavior is correct 1371 * or not. Hence, this may change..... 1372 */ 1373 if (!(old_termios->c_cflag & CLOCAL) && 1374 (tty->termios.c_cflag & CLOCAL)) 1375 wake_up_interruptible(&info->open_wait); 1376 #endif 1377 } 1378 1379 /* 1380 * ------------------------------------------------------------ 1381 * rs_close() 1382 * 1383 * This routine is called when the serial port gets closed. First, we 1384 * wait for the last remaining data to be sent. Then, we unlink its 1385 * async structure from the interrupt chain if necessary, and we free 1386 * that IRQ if nothing is left in the chain. 1387 * ------------------------------------------------------------ 1388 */ 1389 static void rs_close(struct tty_struct *tty, struct file * filp) 1390 { 1391 struct serial_state *state = tty->driver_data; 1392 struct tty_port *port = &state->tport; 1393 1394 if (serial_paranoia_check(state, tty->name, "rs_close")) 1395 return; 1396 1397 if (tty_port_close_start(port, tty, filp) == 0) 1398 return; 1399 1400 /* 1401 * At this point we stop accepting input. To do this, we 1402 * disable the receive line status interrupts, and tell the 1403 * interrupt driver to stop checking the data ready bit in the 1404 * line status register. 1405 */ 1406 state->read_status_mask &= ~UART_LSR_DR; 1407 if (port->flags & ASYNC_INITIALIZED) { 1408 /* disable receive interrupts */ 1409 custom.intena = IF_RBF; 1410 mb(); 1411 /* clear any pending receive interrupt */ 1412 custom.intreq = IF_RBF; 1413 mb(); 1414 1415 /* 1416 * Before we drop DTR, make sure the UART transmitter 1417 * has completely drained; this is especially 1418 * important if there is a transmit FIFO! 1419 */ 1420 rs_wait_until_sent(tty, state->timeout); 1421 } 1422 shutdown(tty, state); 1423 rs_flush_buffer(tty); 1424 1425 tty_ldisc_flush(tty); 1426 port->tty = NULL; 1427 1428 tty_port_close_end(port, tty); 1429 } 1430 1431 /* 1432 * rs_wait_until_sent() --- wait until the transmitter is empty 1433 */ 1434 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1435 { 1436 struct serial_state *info = tty->driver_data; 1437 unsigned long orig_jiffies, char_time; 1438 int lsr; 1439 1440 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1441 return; 1442 1443 if (info->xmit_fifo_size == 0) 1444 return; /* Just in case.... */ 1445 1446 orig_jiffies = jiffies; 1447 1448 /* 1449 * Set the check interval to be 1/5 of the estimated time to 1450 * send a single character, and make it at least 1. The check 1451 * interval should also be less than the timeout. 1452 * 1453 * Note: we have to use pretty tight timings here to satisfy 1454 * the NIST-PCTS. 1455 */ 1456 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1457 char_time = char_time / 5; 1458 if (char_time == 0) 1459 char_time = 1; 1460 if (timeout) 1461 char_time = min_t(unsigned long, char_time, timeout); 1462 /* 1463 * If the transmitter hasn't cleared in twice the approximate 1464 * amount of time to send the entire FIFO, it probably won't 1465 * ever clear. This assumes the UART isn't doing flow 1466 * control, which is currently the case. Hence, if it ever 1467 * takes longer than info->timeout, this is probably due to a 1468 * UART bug of some kind. So, we clamp the timeout parameter at 1469 * 2*info->timeout. 1470 */ 1471 if (!timeout || timeout > 2*info->timeout) 1472 timeout = 2*info->timeout; 1473 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1474 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1475 printk("jiff=%lu...", jiffies); 1476 #endif 1477 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1478 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1479 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1480 #endif 1481 msleep_interruptible(jiffies_to_msecs(char_time)); 1482 if (signal_pending(current)) 1483 break; 1484 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1485 break; 1486 } 1487 __set_current_state(TASK_RUNNING); 1488 1489 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1490 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1491 #endif 1492 } 1493 1494 /* 1495 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1496 */ 1497 static void rs_hangup(struct tty_struct *tty) 1498 { 1499 struct serial_state *info = tty->driver_data; 1500 1501 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1502 return; 1503 1504 rs_flush_buffer(tty); 1505 shutdown(tty, info); 1506 info->tport.count = 0; 1507 info->tport.flags &= ~ASYNC_NORMAL_ACTIVE; 1508 info->tport.tty = NULL; 1509 wake_up_interruptible(&info->tport.open_wait); 1510 } 1511 1512 /* 1513 * This routine is called whenever a serial port is opened. It 1514 * enables interrupts for a serial port, linking in its async structure into 1515 * the IRQ chain. It also performs the serial-specific 1516 * initialization for the tty structure. 1517 */ 1518 static int rs_open(struct tty_struct *tty, struct file * filp) 1519 { 1520 struct serial_state *info = rs_table + tty->index; 1521 struct tty_port *port = &info->tport; 1522 int retval; 1523 1524 port->count++; 1525 port->tty = tty; 1526 tty->driver_data = info; 1527 tty->port = port; 1528 if (serial_paranoia_check(info, tty->name, "rs_open")) 1529 return -ENODEV; 1530 1531 tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1532 1533 retval = startup(tty, info); 1534 if (retval) { 1535 return retval; 1536 } 1537 1538 return tty_port_block_til_ready(port, tty, filp); 1539 } 1540 1541 /* 1542 * /proc fs routines.... 1543 */ 1544 1545 static inline void line_info(struct seq_file *m, int line, 1546 struct serial_state *state) 1547 { 1548 char stat_buf[30], control, status; 1549 unsigned long flags; 1550 1551 seq_printf(m, "%d: uart:amiga_builtin", line); 1552 1553 local_irq_save(flags); 1554 status = ciab.pra; 1555 control = (state->tport.flags & ASYNC_INITIALIZED) ? state->MCR : status; 1556 local_irq_restore(flags); 1557 1558 stat_buf[0] = 0; 1559 stat_buf[1] = 0; 1560 if(!(control & SER_RTS)) 1561 strcat(stat_buf, "|RTS"); 1562 if(!(status & SER_CTS)) 1563 strcat(stat_buf, "|CTS"); 1564 if(!(control & SER_DTR)) 1565 strcat(stat_buf, "|DTR"); 1566 if(!(status & SER_DSR)) 1567 strcat(stat_buf, "|DSR"); 1568 if(!(status & SER_DCD)) 1569 strcat(stat_buf, "|CD"); 1570 1571 if (state->quot) 1572 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1573 1574 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1575 1576 if (state->icount.frame) 1577 seq_printf(m, " fe:%d", state->icount.frame); 1578 1579 if (state->icount.parity) 1580 seq_printf(m, " pe:%d", state->icount.parity); 1581 1582 if (state->icount.brk) 1583 seq_printf(m, " brk:%d", state->icount.brk); 1584 1585 if (state->icount.overrun) 1586 seq_printf(m, " oe:%d", state->icount.overrun); 1587 1588 /* 1589 * Last thing is the RS-232 status lines 1590 */ 1591 seq_printf(m, " %s\n", stat_buf+1); 1592 } 1593 1594 static int rs_proc_show(struct seq_file *m, void *v) 1595 { 1596 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1597 line_info(m, 0, &rs_table[0]); 1598 return 0; 1599 } 1600 1601 static int rs_proc_open(struct inode *inode, struct file *file) 1602 { 1603 return single_open(file, rs_proc_show, NULL); 1604 } 1605 1606 static const struct file_operations rs_proc_fops = { 1607 .owner = THIS_MODULE, 1608 .open = rs_proc_open, 1609 .read = seq_read, 1610 .llseek = seq_lseek, 1611 .release = single_release, 1612 }; 1613 1614 /* 1615 * --------------------------------------------------------------------- 1616 * rs_init() and friends 1617 * 1618 * rs_init() is called at boot-time to initialize the serial driver. 1619 * --------------------------------------------------------------------- 1620 */ 1621 1622 /* 1623 * This routine prints out the appropriate serial driver version 1624 * number, and identifies which options were configured into this 1625 * driver. 1626 */ 1627 static void show_serial_version(void) 1628 { 1629 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1630 } 1631 1632 1633 static const struct tty_operations serial_ops = { 1634 .open = rs_open, 1635 .close = rs_close, 1636 .write = rs_write, 1637 .put_char = rs_put_char, 1638 .flush_chars = rs_flush_chars, 1639 .write_room = rs_write_room, 1640 .chars_in_buffer = rs_chars_in_buffer, 1641 .flush_buffer = rs_flush_buffer, 1642 .ioctl = rs_ioctl, 1643 .throttle = rs_throttle, 1644 .unthrottle = rs_unthrottle, 1645 .set_termios = rs_set_termios, 1646 .stop = rs_stop, 1647 .start = rs_start, 1648 .hangup = rs_hangup, 1649 .break_ctl = rs_break, 1650 .send_xchar = rs_send_xchar, 1651 .wait_until_sent = rs_wait_until_sent, 1652 .tiocmget = rs_tiocmget, 1653 .tiocmset = rs_tiocmset, 1654 .get_icount = rs_get_icount, 1655 .proc_fops = &rs_proc_fops, 1656 }; 1657 1658 static int amiga_carrier_raised(struct tty_port *port) 1659 { 1660 return !(ciab.pra & SER_DCD); 1661 } 1662 1663 static void amiga_dtr_rts(struct tty_port *port, int raise) 1664 { 1665 struct serial_state *info = container_of(port, struct serial_state, 1666 tport); 1667 unsigned long flags; 1668 1669 if (raise) 1670 info->MCR |= SER_DTR|SER_RTS; 1671 else 1672 info->MCR &= ~(SER_DTR|SER_RTS); 1673 1674 local_irq_save(flags); 1675 rtsdtr_ctrl(info->MCR); 1676 local_irq_restore(flags); 1677 } 1678 1679 static const struct tty_port_operations amiga_port_ops = { 1680 .carrier_raised = amiga_carrier_raised, 1681 .dtr_rts = amiga_dtr_rts, 1682 }; 1683 1684 /* 1685 * The serial driver boot-time initialization code! 1686 */ 1687 static int __init amiga_serial_probe(struct platform_device *pdev) 1688 { 1689 unsigned long flags; 1690 struct serial_state * state; 1691 int error; 1692 1693 serial_driver = alloc_tty_driver(NR_PORTS); 1694 if (!serial_driver) 1695 return -ENOMEM; 1696 1697 show_serial_version(); 1698 1699 /* Initialize the tty_driver structure */ 1700 1701 serial_driver->driver_name = "amiserial"; 1702 serial_driver->name = "ttyS"; 1703 serial_driver->major = TTY_MAJOR; 1704 serial_driver->minor_start = 64; 1705 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1706 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1707 serial_driver->init_termios = tty_std_termios; 1708 serial_driver->init_termios.c_cflag = 1709 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1710 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1711 tty_set_operations(serial_driver, &serial_ops); 1712 1713 state = rs_table; 1714 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1715 state->custom_divisor = 0; 1716 state->icount.cts = state->icount.dsr = 1717 state->icount.rng = state->icount.dcd = 0; 1718 state->icount.rx = state->icount.tx = 0; 1719 state->icount.frame = state->icount.parity = 0; 1720 state->icount.overrun = state->icount.brk = 0; 1721 tty_port_init(&state->tport); 1722 state->tport.ops = &amiga_port_ops; 1723 tty_port_link_device(&state->tport, serial_driver, 0); 1724 1725 error = tty_register_driver(serial_driver); 1726 if (error) 1727 goto fail_put_tty_driver; 1728 1729 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1730 1731 /* Hardware set up */ 1732 1733 state->baud_base = amiga_colorclock; 1734 state->xmit_fifo_size = 1; 1735 1736 /* set ISRs, and then disable the rx interrupts */ 1737 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1738 if (error) 1739 goto fail_unregister; 1740 1741 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1742 "serial RX", state); 1743 if (error) 1744 goto fail_free_irq; 1745 1746 local_irq_save(flags); 1747 1748 /* turn off Rx and Tx interrupts */ 1749 custom.intena = IF_RBF | IF_TBE; 1750 mb(); 1751 1752 /* clear any pending interrupt */ 1753 custom.intreq = IF_RBF | IF_TBE; 1754 mb(); 1755 1756 local_irq_restore(flags); 1757 1758 /* 1759 * set the appropriate directions for the modem control flags, 1760 * and clear RTS and DTR 1761 */ 1762 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1763 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1764 1765 platform_set_drvdata(pdev, state); 1766 1767 return 0; 1768 1769 fail_free_irq: 1770 free_irq(IRQ_AMIGA_TBE, state); 1771 fail_unregister: 1772 tty_unregister_driver(serial_driver); 1773 fail_put_tty_driver: 1774 put_tty_driver(serial_driver); 1775 return error; 1776 } 1777 1778 static int __exit amiga_serial_remove(struct platform_device *pdev) 1779 { 1780 int error; 1781 struct serial_state *state = platform_get_drvdata(pdev); 1782 1783 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1784 if ((error = tty_unregister_driver(serial_driver))) 1785 printk("SERIAL: failed to unregister serial driver (%d)\n", 1786 error); 1787 put_tty_driver(serial_driver); 1788 1789 free_irq(IRQ_AMIGA_TBE, state); 1790 free_irq(IRQ_AMIGA_RBF, state); 1791 1792 platform_set_drvdata(pdev, NULL); 1793 1794 return error; 1795 } 1796 1797 static struct platform_driver amiga_serial_driver = { 1798 .remove = __exit_p(amiga_serial_remove), 1799 .driver = { 1800 .name = "amiga-serial", 1801 .owner = THIS_MODULE, 1802 }, 1803 }; 1804 1805 static int __init amiga_serial_init(void) 1806 { 1807 return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe); 1808 } 1809 1810 module_init(amiga_serial_init); 1811 1812 static void __exit amiga_serial_exit(void) 1813 { 1814 platform_driver_unregister(&amiga_serial_driver); 1815 } 1816 1817 module_exit(amiga_serial_exit); 1818 1819 1820 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1821 1822 /* 1823 * ------------------------------------------------------------ 1824 * Serial console driver 1825 * ------------------------------------------------------------ 1826 */ 1827 1828 static void amiga_serial_putc(char c) 1829 { 1830 custom.serdat = (unsigned char)c | 0x100; 1831 while (!(custom.serdatr & 0x2000)) 1832 barrier(); 1833 } 1834 1835 /* 1836 * Print a string to the serial port trying not to disturb 1837 * any possible real use of the port... 1838 * 1839 * The console must be locked when we get here. 1840 */ 1841 static void serial_console_write(struct console *co, const char *s, 1842 unsigned count) 1843 { 1844 unsigned short intena = custom.intenar; 1845 1846 custom.intena = IF_TBE; 1847 1848 while (count--) { 1849 if (*s == '\n') 1850 amiga_serial_putc('\r'); 1851 amiga_serial_putc(*s++); 1852 } 1853 1854 custom.intena = IF_SETCLR | (intena & IF_TBE); 1855 } 1856 1857 static struct tty_driver *serial_console_device(struct console *c, int *index) 1858 { 1859 *index = 0; 1860 return serial_driver; 1861 } 1862 1863 static struct console sercons = { 1864 .name = "ttyS", 1865 .write = serial_console_write, 1866 .device = serial_console_device, 1867 .flags = CON_PRINTBUFFER, 1868 .index = -1, 1869 }; 1870 1871 /* 1872 * Register console. 1873 */ 1874 static int __init amiserial_console_init(void) 1875 { 1876 register_console(&sercons); 1877 return 0; 1878 } 1879 console_initcall(amiserial_console_init); 1880 1881 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1882 1883 MODULE_LICENSE("GPL"); 1884 MODULE_ALIAS("platform:amiga-serial"); 1885