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