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