1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Serial driver for the amiga builtin port. 4 * 5 * This code was created by taking serial.c version 4.30 from kernel 6 * release 2.3.22, replacing all hardware related stuff with the 7 * corresponding amiga hardware actions, and removing all irrelevant 8 * code. As a consequence, it uses many of the constants and names 9 * associated with the registers and bits of 16550 compatible UARTS - 10 * but only to keep track of status, etc in the state variables. It 11 * was done this was to make it easier to keep the code in line with 12 * (non hardware specific) changes to serial.c. 13 * 14 * The port is registered with the tty driver as minor device 64, and 15 * therefore other ports should should only use 65 upwards. 16 * 17 * Richard Lucock 28/12/99 18 * 19 * Copyright (C) 1991, 1992 Linus Torvalds 20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 21 * 1998, 1999 Theodore Ts'o 22 * 23 */ 24 25 /* 26 * Serial driver configuration section. Here are the various options: 27 * 28 * SERIAL_PARANOIA_CHECK 29 * Check the magic number for the async_structure where 30 * ever possible. 31 */ 32 33 #include <linux/delay.h> 34 35 #undef SERIAL_PARANOIA_CHECK 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 <linux/uaccess.h> 132 133 #define serial_isroot() (capable(CAP_SYS_ADMIN)) 134 135 136 static inline int serial_paranoia_check(struct serial_state *info, 137 char *name, const char *routine) 138 { 139 #ifdef SERIAL_PARANOIA_CHECK 140 static const char *badmagic = 141 "Warning: bad magic number for serial struct (%s) in %s\n"; 142 static const char *badinfo = 143 "Warning: null async_struct for (%s) in %s\n"; 144 145 if (!info) { 146 printk(badinfo, name, routine); 147 return 1; 148 } 149 if (info->magic != SERIAL_MAGIC) { 150 printk(badmagic, name, routine); 151 return 1; 152 } 153 #endif 154 return 0; 155 } 156 157 /* some serial hardware definitions */ 158 #define SDR_OVRUN (1<<15) 159 #define SDR_RBF (1<<14) 160 #define SDR_TBE (1<<13) 161 #define SDR_TSRE (1<<12) 162 163 #define SERPER_PARENB (1<<15) 164 165 #define AC_SETCLR (1<<15) 166 #define AC_UARTBRK (1<<11) 167 168 #define SER_DTR (1<<7) 169 #define SER_RTS (1<<6) 170 #define SER_DCD (1<<5) 171 #define SER_CTS (1<<4) 172 #define SER_DSR (1<<3) 173 174 static __inline__ void rtsdtr_ctrl(int bits) 175 { 176 ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR)); 177 } 178 179 /* 180 * ------------------------------------------------------------ 181 * rs_stop() and rs_start() 182 * 183 * This routines are called before setting or resetting tty->stopped. 184 * They enable or disable transmitter interrupts, as necessary. 185 * ------------------------------------------------------------ 186 */ 187 static void rs_stop(struct tty_struct *tty) 188 { 189 struct serial_state *info = tty->driver_data; 190 unsigned long flags; 191 192 if (serial_paranoia_check(info, tty->name, "rs_stop")) 193 return; 194 195 local_irq_save(flags); 196 if (info->IER & UART_IER_THRI) { 197 info->IER &= ~UART_IER_THRI; 198 /* disable Tx interrupt and remove any pending interrupts */ 199 custom.intena = IF_TBE; 200 mb(); 201 custom.intreq = IF_TBE; 202 mb(); 203 } 204 local_irq_restore(flags); 205 } 206 207 static void rs_start(struct tty_struct *tty) 208 { 209 struct serial_state *info = tty->driver_data; 210 unsigned long flags; 211 212 if (serial_paranoia_check(info, tty->name, "rs_start")) 213 return; 214 215 local_irq_save(flags); 216 if (info->xmit.head != info->xmit.tail 217 && info->xmit.buf 218 && !(info->IER & UART_IER_THRI)) { 219 info->IER |= UART_IER_THRI; 220 custom.intena = IF_SETCLR | IF_TBE; 221 mb(); 222 /* set a pending Tx Interrupt, transmitter should restart now */ 223 custom.intreq = IF_SETCLR | IF_TBE; 224 mb(); 225 } 226 local_irq_restore(flags); 227 } 228 229 /* 230 * ---------------------------------------------------------------------- 231 * 232 * Here starts the interrupt handling routines. All of the following 233 * subroutines are declared as inline and are folded into 234 * rs_interrupt(). They were separated out for readability's sake. 235 * 236 * Note: rs_interrupt() is a "fast" interrupt, which means that it 237 * runs with interrupts turned off. People who may want to modify 238 * rs_interrupt() should try to keep the interrupt handler as fast as 239 * possible. After you are done making modifications, it is not a bad 240 * idea to do: 241 * 242 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c 243 * 244 * and look at the resulting assemble code in serial.s. 245 * 246 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 247 * ----------------------------------------------------------------------- 248 */ 249 250 static void receive_chars(struct serial_state *info) 251 { 252 int status; 253 int serdatr; 254 unsigned char ch, flag; 255 struct async_icount *icount; 256 int oe = 0; 257 258 icount = &info->icount; 259 260 status = UART_LSR_DR; /* We obviously have a character! */ 261 serdatr = custom.serdatr; 262 mb(); 263 custom.intreq = IF_RBF; 264 mb(); 265 266 if((serdatr & 0x1ff) == 0) 267 status |= UART_LSR_BI; 268 if(serdatr & SDR_OVRUN) 269 status |= UART_LSR_OE; 270 271 ch = serdatr & 0xff; 272 icount->rx++; 273 274 #ifdef SERIAL_DEBUG_INTR 275 printk("DR%02x:%02x...", ch, status); 276 #endif 277 flag = TTY_NORMAL; 278 279 /* 280 * We don't handle parity or frame errors - but I have left 281 * the code in, since I'm not sure that the errors can't be 282 * detected. 283 */ 284 285 if (status & (UART_LSR_BI | UART_LSR_PE | 286 UART_LSR_FE | UART_LSR_OE)) { 287 /* 288 * For statistics only 289 */ 290 if (status & UART_LSR_BI) { 291 status &= ~(UART_LSR_FE | UART_LSR_PE); 292 icount->brk++; 293 } else if (status & UART_LSR_PE) 294 icount->parity++; 295 else if (status & UART_LSR_FE) 296 icount->frame++; 297 if (status & UART_LSR_OE) 298 icount->overrun++; 299 300 /* 301 * Now check to see if character should be 302 * ignored, and mask off conditions which 303 * should be ignored. 304 */ 305 if (status & info->ignore_status_mask) 306 goto out; 307 308 status &= info->read_status_mask; 309 310 if (status & (UART_LSR_BI)) { 311 #ifdef SERIAL_DEBUG_INTR 312 printk("handling break...."); 313 #endif 314 flag = TTY_BREAK; 315 if (info->tport.flags & ASYNC_SAK) 316 do_SAK(info->tport.tty); 317 } else if (status & UART_LSR_PE) 318 flag = TTY_PARITY; 319 else if (status & UART_LSR_FE) 320 flag = TTY_FRAME; 321 if (status & UART_LSR_OE) { 322 /* 323 * Overrun is special, since it's 324 * reported immediately, and doesn't 325 * affect the current character 326 */ 327 oe = 1; 328 } 329 } 330 tty_insert_flip_char(&info->tport, ch, flag); 331 if (oe == 1) 332 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); 333 tty_flip_buffer_push(&info->tport); 334 out: 335 return; 336 } 337 338 static void transmit_chars(struct serial_state *info) 339 { 340 custom.intreq = IF_TBE; 341 mb(); 342 if (info->x_char) { 343 custom.serdat = info->x_char | 0x100; 344 mb(); 345 info->icount.tx++; 346 info->x_char = 0; 347 return; 348 } 349 if (info->xmit.head == info->xmit.tail 350 || info->tport.tty->stopped 351 || info->tport.tty->hw_stopped) { 352 info->IER &= ~UART_IER_THRI; 353 custom.intena = IF_TBE; 354 mb(); 355 return; 356 } 357 358 custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; 359 mb(); 360 info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1); 361 info->icount.tx++; 362 363 if (CIRC_CNT(info->xmit.head, 364 info->xmit.tail, 365 SERIAL_XMIT_SIZE) < WAKEUP_CHARS) 366 tty_wakeup(info->tport.tty); 367 368 #ifdef SERIAL_DEBUG_INTR 369 printk("THRE..."); 370 #endif 371 if (info->xmit.head == info->xmit.tail) { 372 custom.intena = IF_TBE; 373 mb(); 374 info->IER &= ~UART_IER_THRI; 375 } 376 } 377 378 static void check_modem_status(struct serial_state *info) 379 { 380 struct tty_port *port = &info->tport; 381 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 382 unsigned char dstatus; 383 struct async_icount *icount; 384 385 /* Determine bits that have changed */ 386 dstatus = status ^ current_ctl_bits; 387 current_ctl_bits = status; 388 389 if (dstatus) { 390 icount = &info->icount; 391 /* update input line counters */ 392 if (dstatus & SER_DSR) 393 icount->dsr++; 394 if (dstatus & SER_DCD) { 395 icount->dcd++; 396 } 397 if (dstatus & SER_CTS) 398 icount->cts++; 399 wake_up_interruptible(&port->delta_msr_wait); 400 } 401 402 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) { 403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) 404 printk("ttyS%d CD now %s...", info->line, 405 (!(status & SER_DCD)) ? "on" : "off"); 406 #endif 407 if (!(status & SER_DCD)) 408 wake_up_interruptible(&port->open_wait); 409 else { 410 #ifdef SERIAL_DEBUG_OPEN 411 printk("doing serial hangup..."); 412 #endif 413 if (port->tty) 414 tty_hangup(port->tty); 415 } 416 } 417 if (tty_port_cts_enabled(port)) { 418 if (port->tty->hw_stopped) { 419 if (!(status & SER_CTS)) { 420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 421 printk("CTS tx start..."); 422 #endif 423 port->tty->hw_stopped = 0; 424 info->IER |= UART_IER_THRI; 425 custom.intena = IF_SETCLR | IF_TBE; 426 mb(); 427 /* set a pending Tx Interrupt, transmitter should restart now */ 428 custom.intreq = IF_SETCLR | IF_TBE; 429 mb(); 430 tty_wakeup(port->tty); 431 return; 432 } 433 } else { 434 if ((status & SER_CTS)) { 435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 436 printk("CTS tx stop..."); 437 #endif 438 port->tty->hw_stopped = 1; 439 info->IER &= ~UART_IER_THRI; 440 /* disable Tx interrupt and remove any pending interrupts */ 441 custom.intena = IF_TBE; 442 mb(); 443 custom.intreq = IF_TBE; 444 mb(); 445 } 446 } 447 } 448 } 449 450 static irqreturn_t ser_vbl_int( int irq, void *data) 451 { 452 /* vbl is just a periodic interrupt we tie into to update modem status */ 453 struct serial_state *info = data; 454 /* 455 * TBD - is it better to unregister from this interrupt or to 456 * ignore it if MSI is clear ? 457 */ 458 if(info->IER & UART_IER_MSI) 459 check_modem_status(info); 460 return IRQ_HANDLED; 461 } 462 463 static irqreturn_t ser_rx_int(int irq, void *dev_id) 464 { 465 struct serial_state *info = dev_id; 466 467 #ifdef SERIAL_DEBUG_INTR 468 printk("ser_rx_int..."); 469 #endif 470 471 if (!info->tport.tty) 472 return IRQ_NONE; 473 474 receive_chars(info); 475 #ifdef SERIAL_DEBUG_INTR 476 printk("end.\n"); 477 #endif 478 return IRQ_HANDLED; 479 } 480 481 static irqreturn_t ser_tx_int(int irq, void *dev_id) 482 { 483 struct serial_state *info = dev_id; 484 485 if (custom.serdatr & SDR_TBE) { 486 #ifdef SERIAL_DEBUG_INTR 487 printk("ser_tx_int..."); 488 #endif 489 490 if (!info->tport.tty) 491 return IRQ_NONE; 492 493 transmit_chars(info); 494 #ifdef SERIAL_DEBUG_INTR 495 printk("end.\n"); 496 #endif 497 } 498 return IRQ_HANDLED; 499 } 500 501 /* 502 * ------------------------------------------------------------------- 503 * Here ends the serial interrupt routines. 504 * ------------------------------------------------------------------- 505 */ 506 507 /* 508 * --------------------------------------------------------------- 509 * Low level utility subroutines for the serial driver: routines to 510 * figure out the appropriate timeout for an interrupt chain, routines 511 * to initialize and startup a serial port, and routines to shutdown a 512 * serial port. Useful stuff like that. 513 * --------------------------------------------------------------- 514 */ 515 516 static int startup(struct tty_struct *tty, struct serial_state *info) 517 { 518 struct tty_port *port = &info->tport; 519 unsigned long flags; 520 int retval=0; 521 unsigned long page; 522 523 page = get_zeroed_page(GFP_KERNEL); 524 if (!page) 525 return -ENOMEM; 526 527 local_irq_save(flags); 528 529 if (tty_port_initialized(port)) { 530 free_page(page); 531 goto errout; 532 } 533 534 if (info->xmit.buf) 535 free_page(page); 536 else 537 info->xmit.buf = (unsigned char *) page; 538 539 #ifdef SERIAL_DEBUG_OPEN 540 printk("starting up ttys%d ...", info->line); 541 #endif 542 543 /* Clear anything in the input buffer */ 544 545 custom.intreq = IF_RBF; 546 mb(); 547 548 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); 549 if (retval) { 550 if (serial_isroot()) { 551 set_bit(TTY_IO_ERROR, &tty->flags); 552 retval = 0; 553 } 554 goto errout; 555 } 556 557 /* enable both Rx and Tx interrupts */ 558 custom.intena = IF_SETCLR | IF_RBF | IF_TBE; 559 mb(); 560 info->IER = UART_IER_MSI; 561 562 /* remember current state of the DCD and CTS bits */ 563 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 564 565 info->MCR = 0; 566 if (C_BAUD(tty)) 567 info->MCR = SER_DTR | SER_RTS; 568 rtsdtr_ctrl(info->MCR); 569 570 clear_bit(TTY_IO_ERROR, &tty->flags); 571 info->xmit.head = info->xmit.tail = 0; 572 573 /* 574 * and set the speed of the serial port 575 */ 576 change_speed(tty, info, NULL); 577 578 tty_port_set_initialized(port, 1); 579 local_irq_restore(flags); 580 return 0; 581 582 errout: 583 local_irq_restore(flags); 584 return retval; 585 } 586 587 /* 588 * This routine will shutdown a serial port; interrupts are disabled, and 589 * DTR is dropped if the hangup on close termio flag is on. 590 */ 591 static void shutdown(struct tty_struct *tty, struct serial_state *info) 592 { 593 unsigned long flags; 594 struct serial_state *state; 595 596 if (!tty_port_initialized(&info->tport)) 597 return; 598 599 state = info; 600 601 #ifdef SERIAL_DEBUG_OPEN 602 printk("Shutting down serial port %d ....\n", info->line); 603 #endif 604 605 local_irq_save(flags); /* Disable interrupts */ 606 607 /* 608 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 609 * here so the queue might never be waken up 610 */ 611 wake_up_interruptible(&info->tport.delta_msr_wait); 612 613 /* 614 * Free the IRQ, if necessary 615 */ 616 free_irq(IRQ_AMIGA_VERTB, info); 617 618 if (info->xmit.buf) { 619 free_page((unsigned long) info->xmit.buf); 620 info->xmit.buf = NULL; 621 } 622 623 info->IER = 0; 624 custom.intena = IF_RBF | IF_TBE; 625 mb(); 626 627 /* disable break condition */ 628 custom.adkcon = AC_UARTBRK; 629 mb(); 630 631 if (C_HUPCL(tty)) 632 info->MCR &= ~(SER_DTR|SER_RTS); 633 rtsdtr_ctrl(info->MCR); 634 635 set_bit(TTY_IO_ERROR, &tty->flags); 636 637 tty_port_set_initialized(&info->tport, 0); 638 local_irq_restore(flags); 639 } 640 641 642 /* 643 * This routine is called to set the UART divisor registers to match 644 * the specified baud rate for a serial port. 645 */ 646 static void change_speed(struct tty_struct *tty, struct serial_state *info, 647 struct ktermios *old_termios) 648 { 649 struct tty_port *port = &info->tport; 650 int quot = 0, baud_base, baud; 651 unsigned cflag, cval = 0; 652 int bits; 653 unsigned long flags; 654 655 cflag = tty->termios.c_cflag; 656 657 /* Byte size is always 8 bits plus parity bit if requested */ 658 659 cval = 3; bits = 10; 660 if (cflag & CSTOPB) { 661 cval |= 0x04; 662 bits++; 663 } 664 if (cflag & PARENB) { 665 cval |= UART_LCR_PARITY; 666 bits++; 667 } 668 if (!(cflag & PARODD)) 669 cval |= UART_LCR_EPAR; 670 #ifdef CMSPAR 671 if (cflag & CMSPAR) 672 cval |= UART_LCR_SPAR; 673 #endif 674 675 /* Determine divisor based on baud rate */ 676 baud = tty_get_baud_rate(tty); 677 if (!baud) 678 baud = 9600; /* B0 transition handled in rs_set_termios */ 679 baud_base = info->baud_base; 680 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 681 quot = info->custom_divisor; 682 else { 683 if (baud == 134) 684 /* Special case since 134 is really 134.5 */ 685 quot = (2*baud_base / 269); 686 else if (baud) 687 quot = baud_base / baud; 688 } 689 /* If the quotient is zero refuse the change */ 690 if (!quot && old_termios) { 691 /* FIXME: Will need updating for new tty in the end */ 692 tty->termios.c_cflag &= ~CBAUD; 693 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 694 baud = tty_get_baud_rate(tty); 695 if (!baud) 696 baud = 9600; 697 if (baud == 38400 && 698 (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 } 708 /* As a last resort, if the quotient is zero, default to 9600 bps */ 709 if (!quot) 710 quot = baud_base / 9600; 711 info->quot = quot; 712 info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base); 713 info->timeout += HZ/50; /* Add .02 seconds of slop */ 714 715 /* CTS flow control flag and modem status interrupts */ 716 info->IER &= ~UART_IER_MSI; 717 if (port->flags & ASYNC_HARDPPS_CD) 718 info->IER |= UART_IER_MSI; 719 tty_port_set_cts_flow(port, cflag & CRTSCTS); 720 if (cflag & CRTSCTS) 721 info->IER |= UART_IER_MSI; 722 tty_port_set_check_carrier(port, ~cflag & CLOCAL); 723 if (~cflag & CLOCAL) 724 info->IER |= UART_IER_MSI; 725 /* TBD: 726 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 727 */ 728 729 /* 730 * Set up parity check flag 731 */ 732 733 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 734 if (I_INPCK(tty)) 735 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 736 if (I_BRKINT(tty) || I_PARMRK(tty)) 737 info->read_status_mask |= UART_LSR_BI; 738 739 /* 740 * Characters to ignore 741 */ 742 info->ignore_status_mask = 0; 743 if (I_IGNPAR(tty)) 744 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 745 if (I_IGNBRK(tty)) { 746 info->ignore_status_mask |= UART_LSR_BI; 747 /* 748 * If we're ignore parity and break indicators, ignore 749 * overruns too. (For real raw support). 750 */ 751 if (I_IGNPAR(tty)) 752 info->ignore_status_mask |= UART_LSR_OE; 753 } 754 /* 755 * !!! ignore all characters if CREAD is not set 756 */ 757 if ((cflag & CREAD) == 0) 758 info->ignore_status_mask |= UART_LSR_DR; 759 local_irq_save(flags); 760 761 { 762 short serper; 763 764 /* Set up the baud rate */ 765 serper = quot - 1; 766 767 /* Enable or disable parity bit */ 768 769 if(cval & UART_LCR_PARITY) 770 serper |= (SERPER_PARENB); 771 772 custom.serper = serper; 773 mb(); 774 } 775 776 local_irq_restore(flags); 777 } 778 779 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 780 { 781 struct serial_state *info; 782 unsigned long flags; 783 784 info = tty->driver_data; 785 786 if (serial_paranoia_check(info, tty->name, "rs_put_char")) 787 return 0; 788 789 if (!info->xmit.buf) 790 return 0; 791 792 local_irq_save(flags); 793 if (CIRC_SPACE(info->xmit.head, 794 info->xmit.tail, 795 SERIAL_XMIT_SIZE) == 0) { 796 local_irq_restore(flags); 797 return 0; 798 } 799 800 info->xmit.buf[info->xmit.head++] = ch; 801 info->xmit.head &= SERIAL_XMIT_SIZE-1; 802 local_irq_restore(flags); 803 return 1; 804 } 805 806 static void rs_flush_chars(struct tty_struct *tty) 807 { 808 struct serial_state *info = tty->driver_data; 809 unsigned long flags; 810 811 if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) 812 return; 813 814 if (info->xmit.head == info->xmit.tail 815 || tty->stopped 816 || tty->hw_stopped 817 || !info->xmit.buf) 818 return; 819 820 local_irq_save(flags); 821 info->IER |= UART_IER_THRI; 822 custom.intena = IF_SETCLR | IF_TBE; 823 mb(); 824 /* set a pending Tx Interrupt, transmitter should restart now */ 825 custom.intreq = IF_SETCLR | IF_TBE; 826 mb(); 827 local_irq_restore(flags); 828 } 829 830 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 831 { 832 int c, ret = 0; 833 struct serial_state *info = tty->driver_data; 834 unsigned long flags; 835 836 if (serial_paranoia_check(info, tty->name, "rs_write")) 837 return 0; 838 839 if (!info->xmit.buf) 840 return 0; 841 842 local_irq_save(flags); 843 while (1) { 844 c = CIRC_SPACE_TO_END(info->xmit.head, 845 info->xmit.tail, 846 SERIAL_XMIT_SIZE); 847 if (count < c) 848 c = count; 849 if (c <= 0) { 850 break; 851 } 852 memcpy(info->xmit.buf + info->xmit.head, buf, c); 853 info->xmit.head = ((info->xmit.head + c) & 854 (SERIAL_XMIT_SIZE-1)); 855 buf += c; 856 count -= c; 857 ret += c; 858 } 859 local_irq_restore(flags); 860 861 if (info->xmit.head != info->xmit.tail 862 && !tty->stopped 863 && !tty->hw_stopped 864 && !(info->IER & UART_IER_THRI)) { 865 info->IER |= UART_IER_THRI; 866 local_irq_disable(); 867 custom.intena = IF_SETCLR | IF_TBE; 868 mb(); 869 /* set a pending Tx Interrupt, transmitter should restart now */ 870 custom.intreq = IF_SETCLR | IF_TBE; 871 mb(); 872 local_irq_restore(flags); 873 } 874 return ret; 875 } 876 877 static int rs_write_room(struct tty_struct *tty) 878 { 879 struct serial_state *info = tty->driver_data; 880 881 if (serial_paranoia_check(info, tty->name, "rs_write_room")) 882 return 0; 883 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 884 } 885 886 static int rs_chars_in_buffer(struct tty_struct *tty) 887 { 888 struct serial_state *info = tty->driver_data; 889 890 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) 891 return 0; 892 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 893 } 894 895 static void rs_flush_buffer(struct tty_struct *tty) 896 { 897 struct serial_state *info = tty->driver_data; 898 unsigned long flags; 899 900 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) 901 return; 902 local_irq_save(flags); 903 info->xmit.head = info->xmit.tail = 0; 904 local_irq_restore(flags); 905 tty_wakeup(tty); 906 } 907 908 /* 909 * This function is used to send a high-priority XON/XOFF character to 910 * the device 911 */ 912 static void rs_send_xchar(struct tty_struct *tty, char ch) 913 { 914 struct serial_state *info = tty->driver_data; 915 unsigned long flags; 916 917 if (serial_paranoia_check(info, tty->name, "rs_send_xchar")) 918 return; 919 920 info->x_char = ch; 921 if (ch) { 922 /* Make sure transmit interrupts are on */ 923 924 /* Check this ! */ 925 local_irq_save(flags); 926 if(!(custom.intenar & IF_TBE)) { 927 custom.intena = IF_SETCLR | IF_TBE; 928 mb(); 929 /* set a pending Tx Interrupt, transmitter should restart now */ 930 custom.intreq = IF_SETCLR | IF_TBE; 931 mb(); 932 } 933 local_irq_restore(flags); 934 935 info->IER |= UART_IER_THRI; 936 } 937 } 938 939 /* 940 * ------------------------------------------------------------ 941 * rs_throttle() 942 * 943 * This routine is called by the upper-layer tty layer to signal that 944 * incoming characters should be throttled. 945 * ------------------------------------------------------------ 946 */ 947 static void rs_throttle(struct tty_struct * tty) 948 { 949 struct serial_state *info = tty->driver_data; 950 unsigned long flags; 951 #ifdef SERIAL_DEBUG_THROTTLE 952 printk("throttle %s ....\n", tty_name(tty)); 953 #endif 954 955 if (serial_paranoia_check(info, tty->name, "rs_throttle")) 956 return; 957 958 if (I_IXOFF(tty)) 959 rs_send_xchar(tty, STOP_CHAR(tty)); 960 961 if (C_CRTSCTS(tty)) 962 info->MCR &= ~SER_RTS; 963 964 local_irq_save(flags); 965 rtsdtr_ctrl(info->MCR); 966 local_irq_restore(flags); 967 } 968 969 static void rs_unthrottle(struct tty_struct * tty) 970 { 971 struct serial_state *info = tty->driver_data; 972 unsigned long flags; 973 #ifdef SERIAL_DEBUG_THROTTLE 974 printk("unthrottle %s ....\n", tty_name(tty)); 975 #endif 976 977 if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) 978 return; 979 980 if (I_IXOFF(tty)) { 981 if (info->x_char) 982 info->x_char = 0; 983 else 984 rs_send_xchar(tty, START_CHAR(tty)); 985 } 986 if (C_CRTSCTS(tty)) 987 info->MCR |= SER_RTS; 988 local_irq_save(flags); 989 rtsdtr_ctrl(info->MCR); 990 local_irq_restore(flags); 991 } 992 993 /* 994 * ------------------------------------------------------------ 995 * rs_ioctl() and friends 996 * ------------------------------------------------------------ 997 */ 998 999 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss) 1000 { 1001 struct serial_state *state = tty->driver_data; 1002 1003 tty_lock(tty); 1004 ss->line = tty->index; 1005 ss->port = state->port; 1006 ss->flags = state->tport.flags; 1007 ss->xmit_fifo_size = state->xmit_fifo_size; 1008 ss->baud_base = state->baud_base; 1009 ss->close_delay = state->tport.close_delay; 1010 ss->closing_wait = state->tport.closing_wait; 1011 ss->custom_divisor = state->custom_divisor; 1012 tty_unlock(tty); 1013 return 0; 1014 } 1015 1016 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) 1017 { 1018 struct serial_state *state = tty->driver_data; 1019 struct tty_port *port = &state->tport; 1020 bool change_spd; 1021 int retval = 0; 1022 1023 tty_lock(tty); 1024 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) || 1025 ss->custom_divisor != state->custom_divisor; 1026 if (ss->irq || ss->port != state->port || 1027 ss->xmit_fifo_size != state->xmit_fifo_size) { 1028 tty_unlock(tty); 1029 return -EINVAL; 1030 } 1031 1032 if (!serial_isroot()) { 1033 if ((ss->baud_base != state->baud_base) || 1034 (ss->close_delay != port->close_delay) || 1035 (ss->xmit_fifo_size != state->xmit_fifo_size) || 1036 ((ss->flags & ~ASYNC_USR_MASK) != 1037 (port->flags & ~ASYNC_USR_MASK))) { 1038 tty_unlock(tty); 1039 return -EPERM; 1040 } 1041 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 1042 (ss->flags & ASYNC_USR_MASK)); 1043 state->custom_divisor = ss->custom_divisor; 1044 goto check_and_exit; 1045 } 1046 1047 if (ss->baud_base < 9600) { 1048 tty_unlock(tty); 1049 return -EINVAL; 1050 } 1051 1052 /* 1053 * OK, past this point, all the error checking has been done. 1054 * At this point, we start making changes..... 1055 */ 1056 1057 state->baud_base = ss->baud_base; 1058 port->flags = ((port->flags & ~ASYNC_FLAGS) | 1059 (ss->flags & ASYNC_FLAGS)); 1060 state->custom_divisor = ss->custom_divisor; 1061 port->close_delay = ss->close_delay * HZ/100; 1062 port->closing_wait = ss->closing_wait * HZ/100; 1063 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1064 1065 check_and_exit: 1066 if (tty_port_initialized(port)) { 1067 if (change_spd) { 1068 /* warn about deprecation unless clearing */ 1069 if (ss->flags & ASYNC_SPD_MASK) 1070 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); 1071 change_speed(tty, state, NULL); 1072 } 1073 } else 1074 retval = startup(tty, state); 1075 tty_unlock(tty); 1076 return retval; 1077 } 1078 1079 /* 1080 * get_lsr_info - get line status register info 1081 * 1082 * Purpose: Let user call ioctl() to get info when the UART physically 1083 * is emptied. On bus types like RS485, the transmitter must 1084 * release the bus after transmitting. This must be done when 1085 * the transmit shift register is empty, not be done when the 1086 * transmit holding register is empty. This functionality 1087 * allows an RS485 driver to be written in user space. 1088 */ 1089 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1090 { 1091 unsigned char status; 1092 unsigned int result; 1093 unsigned long flags; 1094 1095 local_irq_save(flags); 1096 status = custom.serdatr; 1097 mb(); 1098 local_irq_restore(flags); 1099 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1100 if (copy_to_user(value, &result, sizeof(int))) 1101 return -EFAULT; 1102 return 0; 1103 } 1104 1105 1106 static int rs_tiocmget(struct tty_struct *tty) 1107 { 1108 struct serial_state *info = tty->driver_data; 1109 unsigned char control, status; 1110 unsigned long flags; 1111 1112 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1113 return -ENODEV; 1114 if (tty_io_error(tty)) 1115 return -EIO; 1116 1117 control = info->MCR; 1118 local_irq_save(flags); 1119 status = ciab.pra; 1120 local_irq_restore(flags); 1121 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1122 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1123 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1124 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1125 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1126 } 1127 1128 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1129 unsigned int clear) 1130 { 1131 struct serial_state *info = tty->driver_data; 1132 unsigned long flags; 1133 1134 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1135 return -ENODEV; 1136 if (tty_io_error(tty)) 1137 return -EIO; 1138 1139 local_irq_save(flags); 1140 if (set & TIOCM_RTS) 1141 info->MCR |= SER_RTS; 1142 if (set & TIOCM_DTR) 1143 info->MCR |= SER_DTR; 1144 if (clear & TIOCM_RTS) 1145 info->MCR &= ~SER_RTS; 1146 if (clear & TIOCM_DTR) 1147 info->MCR &= ~SER_DTR; 1148 rtsdtr_ctrl(info->MCR); 1149 local_irq_restore(flags); 1150 return 0; 1151 } 1152 1153 /* 1154 * rs_break() --- routine which turns the break handling on or off 1155 */ 1156 static int rs_break(struct tty_struct *tty, int break_state) 1157 { 1158 struct serial_state *info = tty->driver_data; 1159 unsigned long flags; 1160 1161 if (serial_paranoia_check(info, tty->name, "rs_break")) 1162 return -EINVAL; 1163 1164 local_irq_save(flags); 1165 if (break_state == -1) 1166 custom.adkcon = AC_SETCLR | AC_UARTBRK; 1167 else 1168 custom.adkcon = AC_UARTBRK; 1169 mb(); 1170 local_irq_restore(flags); 1171 return 0; 1172 } 1173 1174 /* 1175 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1176 * Return: write counters to the user passed counter struct 1177 * NB: both 1->0 and 0->1 transitions are counted except for 1178 * RI where only 0->1 is counted. 1179 */ 1180 static int rs_get_icount(struct tty_struct *tty, 1181 struct serial_icounter_struct *icount) 1182 { 1183 struct serial_state *info = tty->driver_data; 1184 struct async_icount cnow; 1185 unsigned long flags; 1186 1187 local_irq_save(flags); 1188 cnow = info->icount; 1189 local_irq_restore(flags); 1190 icount->cts = cnow.cts; 1191 icount->dsr = cnow.dsr; 1192 icount->rng = cnow.rng; 1193 icount->dcd = cnow.dcd; 1194 icount->rx = cnow.rx; 1195 icount->tx = cnow.tx; 1196 icount->frame = cnow.frame; 1197 icount->overrun = cnow.overrun; 1198 icount->parity = cnow.parity; 1199 icount->brk = cnow.brk; 1200 icount->buf_overrun = cnow.buf_overrun; 1201 1202 return 0; 1203 } 1204 1205 static int rs_ioctl(struct tty_struct *tty, 1206 unsigned int cmd, unsigned long arg) 1207 { 1208 struct serial_state *info = tty->driver_data; 1209 struct async_icount cprev, cnow; /* kernel counter temps */ 1210 void __user *argp = (void __user *)arg; 1211 unsigned long flags; 1212 DEFINE_WAIT(wait); 1213 int ret; 1214 1215 if (serial_paranoia_check(info, tty->name, "rs_ioctl")) 1216 return -ENODEV; 1217 1218 if ((cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) && 1219 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1220 if (tty_io_error(tty)) 1221 return -EIO; 1222 } 1223 1224 switch (cmd) { 1225 case TIOCSERCONFIG: 1226 return 0; 1227 1228 case TIOCSERGETLSR: /* Get line status register */ 1229 return get_lsr_info(info, argp); 1230 1231 case TIOCSERGSTRUCT: 1232 if (copy_to_user(argp, 1233 info, sizeof(struct serial_state))) 1234 return -EFAULT; 1235 return 0; 1236 1237 /* 1238 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1239 * - mask passed in arg for lines of interest 1240 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1241 * Caller should use TIOCGICOUNT to see which one it was 1242 */ 1243 case TIOCMIWAIT: 1244 local_irq_save(flags); 1245 /* note the counters on entry */ 1246 cprev = info->icount; 1247 local_irq_restore(flags); 1248 while (1) { 1249 prepare_to_wait(&info->tport.delta_msr_wait, 1250 &wait, TASK_INTERRUPTIBLE); 1251 local_irq_save(flags); 1252 cnow = info->icount; /* atomic copy */ 1253 local_irq_restore(flags); 1254 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1255 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 1256 ret = -EIO; /* no change => error */ 1257 break; 1258 } 1259 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1260 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1261 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1262 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1263 ret = 0; 1264 break; 1265 } 1266 schedule(); 1267 /* see if a signal did it */ 1268 if (signal_pending(current)) { 1269 ret = -ERESTARTSYS; 1270 break; 1271 } 1272 cprev = cnow; 1273 } 1274 finish_wait(&info->tport.delta_msr_wait, &wait); 1275 return ret; 1276 1277 case TIOCSERGWILD: 1278 case TIOCSERSWILD: 1279 /* "setserial -W" is called in Debian boot */ 1280 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n"); 1281 return 0; 1282 1283 default: 1284 return -ENOIOCTLCMD; 1285 } 1286 return 0; 1287 } 1288 1289 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1290 { 1291 struct serial_state *info = tty->driver_data; 1292 unsigned long flags; 1293 unsigned int cflag = tty->termios.c_cflag; 1294 1295 change_speed(tty, info, old_termios); 1296 1297 /* Handle transition to B0 status */ 1298 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { 1299 info->MCR &= ~(SER_DTR|SER_RTS); 1300 local_irq_save(flags); 1301 rtsdtr_ctrl(info->MCR); 1302 local_irq_restore(flags); 1303 } 1304 1305 /* Handle transition away from B0 status */ 1306 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1307 info->MCR |= SER_DTR; 1308 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 1309 info->MCR |= SER_RTS; 1310 local_irq_save(flags); 1311 rtsdtr_ctrl(info->MCR); 1312 local_irq_restore(flags); 1313 } 1314 1315 /* Handle turning off CRTSCTS */ 1316 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 1317 tty->hw_stopped = 0; 1318 rs_start(tty); 1319 } 1320 1321 #if 0 1322 /* 1323 * No need to wake up processes in open wait, since they 1324 * sample the CLOCAL flag once, and don't recheck it. 1325 * XXX It's not clear whether the current behavior is correct 1326 * or not. Hence, this may change..... 1327 */ 1328 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1329 wake_up_interruptible(&info->open_wait); 1330 #endif 1331 } 1332 1333 /* 1334 * ------------------------------------------------------------ 1335 * rs_close() 1336 * 1337 * This routine is called when the serial port gets closed. First, we 1338 * wait for the last remaining data to be sent. Then, we unlink its 1339 * async structure from the interrupt chain if necessary, and we free 1340 * that IRQ if nothing is left in the chain. 1341 * ------------------------------------------------------------ 1342 */ 1343 static void rs_close(struct tty_struct *tty, struct file * filp) 1344 { 1345 struct serial_state *state = tty->driver_data; 1346 struct tty_port *port = &state->tport; 1347 1348 if (serial_paranoia_check(state, tty->name, "rs_close")) 1349 return; 1350 1351 if (tty_port_close_start(port, tty, filp) == 0) 1352 return; 1353 1354 /* 1355 * At this point we stop accepting input. To do this, we 1356 * disable the receive line status interrupts, and tell the 1357 * interrupt driver to stop checking the data ready bit in the 1358 * line status register. 1359 */ 1360 state->read_status_mask &= ~UART_LSR_DR; 1361 if (tty_port_initialized(port)) { 1362 /* disable receive interrupts */ 1363 custom.intena = IF_RBF; 1364 mb(); 1365 /* clear any pending receive interrupt */ 1366 custom.intreq = IF_RBF; 1367 mb(); 1368 1369 /* 1370 * Before we drop DTR, make sure the UART transmitter 1371 * has completely drained; this is especially 1372 * important if there is a transmit FIFO! 1373 */ 1374 rs_wait_until_sent(tty, state->timeout); 1375 } 1376 shutdown(tty, state); 1377 rs_flush_buffer(tty); 1378 1379 tty_ldisc_flush(tty); 1380 port->tty = NULL; 1381 1382 tty_port_close_end(port, tty); 1383 } 1384 1385 /* 1386 * rs_wait_until_sent() --- wait until the transmitter is empty 1387 */ 1388 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1389 { 1390 struct serial_state *info = tty->driver_data; 1391 unsigned long orig_jiffies, char_time; 1392 int lsr; 1393 1394 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) 1395 return; 1396 1397 if (info->xmit_fifo_size == 0) 1398 return; /* Just in case.... */ 1399 1400 orig_jiffies = jiffies; 1401 1402 /* 1403 * Set the check interval to be 1/5 of the estimated time to 1404 * send a single character, and make it at least 1. The check 1405 * interval should also be less than the timeout. 1406 * 1407 * Note: we have to use pretty tight timings here to satisfy 1408 * the NIST-PCTS. 1409 */ 1410 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size; 1411 char_time = char_time / 5; 1412 if (char_time == 0) 1413 char_time = 1; 1414 if (timeout) 1415 char_time = min_t(unsigned long, char_time, timeout); 1416 /* 1417 * If the transmitter hasn't cleared in twice the approximate 1418 * amount of time to send the entire FIFO, it probably won't 1419 * ever clear. This assumes the UART isn't doing flow 1420 * control, which is currently the case. Hence, if it ever 1421 * takes longer than info->timeout, this is probably due to a 1422 * UART bug of some kind. So, we clamp the timeout parameter at 1423 * 2*info->timeout. 1424 */ 1425 if (!timeout || timeout > 2*info->timeout) 1426 timeout = 2*info->timeout; 1427 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1428 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1429 printk("jiff=%lu...", jiffies); 1430 #endif 1431 while(!((lsr = custom.serdatr) & SDR_TSRE)) { 1432 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1433 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1434 #endif 1435 msleep_interruptible(jiffies_to_msecs(char_time)); 1436 if (signal_pending(current)) 1437 break; 1438 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1439 break; 1440 } 1441 __set_current_state(TASK_RUNNING); 1442 1443 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1444 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1445 #endif 1446 } 1447 1448 /* 1449 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1450 */ 1451 static void rs_hangup(struct tty_struct *tty) 1452 { 1453 struct serial_state *info = tty->driver_data; 1454 1455 if (serial_paranoia_check(info, tty->name, "rs_hangup")) 1456 return; 1457 1458 rs_flush_buffer(tty); 1459 shutdown(tty, info); 1460 info->tport.count = 0; 1461 tty_port_set_active(&info->tport, 0); 1462 info->tport.tty = NULL; 1463 wake_up_interruptible(&info->tport.open_wait); 1464 } 1465 1466 /* 1467 * This routine is called whenever a serial port is opened. It 1468 * enables interrupts for a serial port, linking in its async structure into 1469 * the IRQ chain. It also performs the serial-specific 1470 * initialization for the tty structure. 1471 */ 1472 static int rs_open(struct tty_struct *tty, struct file * filp) 1473 { 1474 struct serial_state *info = rs_table + tty->index; 1475 struct tty_port *port = &info->tport; 1476 int retval; 1477 1478 port->count++; 1479 port->tty = tty; 1480 tty->driver_data = info; 1481 tty->port = port; 1482 if (serial_paranoia_check(info, tty->name, "rs_open")) 1483 return -ENODEV; 1484 1485 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; 1486 1487 retval = startup(tty, info); 1488 if (retval) { 1489 return retval; 1490 } 1491 1492 return tty_port_block_til_ready(port, tty, filp); 1493 } 1494 1495 /* 1496 * /proc fs routines.... 1497 */ 1498 1499 static inline void line_info(struct seq_file *m, int line, 1500 struct serial_state *state) 1501 { 1502 char stat_buf[30], control, status; 1503 unsigned long flags; 1504 1505 seq_printf(m, "%d: uart:amiga_builtin", line); 1506 1507 local_irq_save(flags); 1508 status = ciab.pra; 1509 control = tty_port_initialized(&state->tport) ? state->MCR : status; 1510 local_irq_restore(flags); 1511 1512 stat_buf[0] = 0; 1513 stat_buf[1] = 0; 1514 if(!(control & SER_RTS)) 1515 strcat(stat_buf, "|RTS"); 1516 if(!(status & SER_CTS)) 1517 strcat(stat_buf, "|CTS"); 1518 if(!(control & SER_DTR)) 1519 strcat(stat_buf, "|DTR"); 1520 if(!(status & SER_DSR)) 1521 strcat(stat_buf, "|DSR"); 1522 if(!(status & SER_DCD)) 1523 strcat(stat_buf, "|CD"); 1524 1525 if (state->quot) 1526 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1527 1528 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1529 1530 if (state->icount.frame) 1531 seq_printf(m, " fe:%d", state->icount.frame); 1532 1533 if (state->icount.parity) 1534 seq_printf(m, " pe:%d", state->icount.parity); 1535 1536 if (state->icount.brk) 1537 seq_printf(m, " brk:%d", state->icount.brk); 1538 1539 if (state->icount.overrun) 1540 seq_printf(m, " oe:%d", state->icount.overrun); 1541 1542 /* 1543 * Last thing is the RS-232 status lines 1544 */ 1545 seq_printf(m, " %s\n", stat_buf+1); 1546 } 1547 1548 static int rs_proc_show(struct seq_file *m, void *v) 1549 { 1550 seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version); 1551 line_info(m, 0, &rs_table[0]); 1552 return 0; 1553 } 1554 1555 /* 1556 * --------------------------------------------------------------------- 1557 * rs_init() and friends 1558 * 1559 * rs_init() is called at boot-time to initialize the serial driver. 1560 * --------------------------------------------------------------------- 1561 */ 1562 1563 /* 1564 * This routine prints out the appropriate serial driver version 1565 * number, and identifies which options were configured into this 1566 * driver. 1567 */ 1568 static void show_serial_version(void) 1569 { 1570 printk(KERN_INFO "%s version %s\n", serial_name, serial_version); 1571 } 1572 1573 1574 static const struct tty_operations serial_ops = { 1575 .open = rs_open, 1576 .close = rs_close, 1577 .write = rs_write, 1578 .put_char = rs_put_char, 1579 .flush_chars = rs_flush_chars, 1580 .write_room = rs_write_room, 1581 .chars_in_buffer = rs_chars_in_buffer, 1582 .flush_buffer = rs_flush_buffer, 1583 .ioctl = rs_ioctl, 1584 .throttle = rs_throttle, 1585 .unthrottle = rs_unthrottle, 1586 .set_termios = rs_set_termios, 1587 .stop = rs_stop, 1588 .start = rs_start, 1589 .hangup = rs_hangup, 1590 .break_ctl = rs_break, 1591 .send_xchar = rs_send_xchar, 1592 .wait_until_sent = rs_wait_until_sent, 1593 .tiocmget = rs_tiocmget, 1594 .tiocmset = rs_tiocmset, 1595 .get_icount = rs_get_icount, 1596 .set_serial = set_serial_info, 1597 .get_serial = get_serial_info, 1598 .proc_show = rs_proc_show, 1599 }; 1600 1601 static int amiga_carrier_raised(struct tty_port *port) 1602 { 1603 return !(ciab.pra & SER_DCD); 1604 } 1605 1606 static void amiga_dtr_rts(struct tty_port *port, int raise) 1607 { 1608 struct serial_state *info = container_of(port, struct serial_state, 1609 tport); 1610 unsigned long flags; 1611 1612 if (raise) 1613 info->MCR |= SER_DTR|SER_RTS; 1614 else 1615 info->MCR &= ~(SER_DTR|SER_RTS); 1616 1617 local_irq_save(flags); 1618 rtsdtr_ctrl(info->MCR); 1619 local_irq_restore(flags); 1620 } 1621 1622 static const struct tty_port_operations amiga_port_ops = { 1623 .carrier_raised = amiga_carrier_raised, 1624 .dtr_rts = amiga_dtr_rts, 1625 }; 1626 1627 /* 1628 * The serial driver boot-time initialization code! 1629 */ 1630 static int __init amiga_serial_probe(struct platform_device *pdev) 1631 { 1632 unsigned long flags; 1633 struct serial_state * state; 1634 int error; 1635 1636 serial_driver = alloc_tty_driver(NR_PORTS); 1637 if (!serial_driver) 1638 return -ENOMEM; 1639 1640 show_serial_version(); 1641 1642 /* Initialize the tty_driver structure */ 1643 1644 serial_driver->driver_name = "amiserial"; 1645 serial_driver->name = "ttyS"; 1646 serial_driver->major = TTY_MAJOR; 1647 serial_driver->minor_start = 64; 1648 serial_driver->type = TTY_DRIVER_TYPE_SERIAL; 1649 serial_driver->subtype = SERIAL_TYPE_NORMAL; 1650 serial_driver->init_termios = tty_std_termios; 1651 serial_driver->init_termios.c_cflag = 1652 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1653 serial_driver->flags = TTY_DRIVER_REAL_RAW; 1654 tty_set_operations(serial_driver, &serial_ops); 1655 1656 state = rs_table; 1657 state->port = (int)&custom.serdatr; /* Just to give it a value */ 1658 state->custom_divisor = 0; 1659 state->icount.cts = state->icount.dsr = 1660 state->icount.rng = state->icount.dcd = 0; 1661 state->icount.rx = state->icount.tx = 0; 1662 state->icount.frame = state->icount.parity = 0; 1663 state->icount.overrun = state->icount.brk = 0; 1664 tty_port_init(&state->tport); 1665 state->tport.ops = &amiga_port_ops; 1666 tty_port_link_device(&state->tport, serial_driver, 0); 1667 1668 error = tty_register_driver(serial_driver); 1669 if (error) 1670 goto fail_put_tty_driver; 1671 1672 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1673 1674 /* Hardware set up */ 1675 1676 state->baud_base = amiga_colorclock; 1677 state->xmit_fifo_size = 1; 1678 1679 /* set ISRs, and then disable the rx interrupts */ 1680 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1681 if (error) 1682 goto fail_unregister; 1683 1684 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1685 "serial RX", state); 1686 if (error) 1687 goto fail_free_irq; 1688 1689 local_irq_save(flags); 1690 1691 /* turn off Rx and Tx interrupts */ 1692 custom.intena = IF_RBF | IF_TBE; 1693 mb(); 1694 1695 /* clear any pending interrupt */ 1696 custom.intreq = IF_RBF | IF_TBE; 1697 mb(); 1698 1699 local_irq_restore(flags); 1700 1701 /* 1702 * set the appropriate directions for the modem control flags, 1703 * and clear RTS and DTR 1704 */ 1705 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1706 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1707 1708 platform_set_drvdata(pdev, state); 1709 1710 return 0; 1711 1712 fail_free_irq: 1713 free_irq(IRQ_AMIGA_TBE, state); 1714 fail_unregister: 1715 tty_unregister_driver(serial_driver); 1716 fail_put_tty_driver: 1717 tty_port_destroy(&state->tport); 1718 put_tty_driver(serial_driver); 1719 return error; 1720 } 1721 1722 static int __exit amiga_serial_remove(struct platform_device *pdev) 1723 { 1724 int error; 1725 struct serial_state *state = platform_get_drvdata(pdev); 1726 1727 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */ 1728 error = tty_unregister_driver(serial_driver); 1729 if (error) 1730 printk("SERIAL: failed to unregister serial driver (%d)\n", 1731 error); 1732 put_tty_driver(serial_driver); 1733 tty_port_destroy(&state->tport); 1734 1735 free_irq(IRQ_AMIGA_TBE, state); 1736 free_irq(IRQ_AMIGA_RBF, state); 1737 1738 return error; 1739 } 1740 1741 static struct platform_driver amiga_serial_driver = { 1742 .remove = __exit_p(amiga_serial_remove), 1743 .driver = { 1744 .name = "amiga-serial", 1745 }, 1746 }; 1747 1748 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1749 1750 1751 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1752 1753 /* 1754 * ------------------------------------------------------------ 1755 * Serial console driver 1756 * ------------------------------------------------------------ 1757 */ 1758 1759 static void amiga_serial_putc(char c) 1760 { 1761 custom.serdat = (unsigned char)c | 0x100; 1762 while (!(custom.serdatr & 0x2000)) 1763 barrier(); 1764 } 1765 1766 /* 1767 * Print a string to the serial port trying not to disturb 1768 * any possible real use of the port... 1769 * 1770 * The console must be locked when we get here. 1771 */ 1772 static void serial_console_write(struct console *co, const char *s, 1773 unsigned count) 1774 { 1775 unsigned short intena = custom.intenar; 1776 1777 custom.intena = IF_TBE; 1778 1779 while (count--) { 1780 if (*s == '\n') 1781 amiga_serial_putc('\r'); 1782 amiga_serial_putc(*s++); 1783 } 1784 1785 custom.intena = IF_SETCLR | (intena & IF_TBE); 1786 } 1787 1788 static struct tty_driver *serial_console_device(struct console *c, int *index) 1789 { 1790 *index = 0; 1791 return serial_driver; 1792 } 1793 1794 static struct console sercons = { 1795 .name = "ttyS", 1796 .write = serial_console_write, 1797 .device = serial_console_device, 1798 .flags = CON_PRINTBUFFER, 1799 .index = -1, 1800 }; 1801 1802 /* 1803 * Register console. 1804 */ 1805 static int __init amiserial_console_init(void) 1806 { 1807 if (!MACH_IS_AMIGA) 1808 return -ENODEV; 1809 1810 register_console(&sercons); 1811 return 0; 1812 } 1813 console_initcall(amiserial_console_init); 1814 1815 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1816 1817 MODULE_LICENSE("GPL"); 1818 MODULE_ALIAS("platform:amiga-serial"); 1819