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 if (info->xmit.buf) { 542 free_page((unsigned long) info->xmit.buf); 543 info->xmit.buf = NULL; 544 } 545 546 info->IER = 0; 547 amiga_custom.intena = IF_RBF | IF_TBE; 548 mb(); 549 550 /* disable break condition */ 551 amiga_custom.adkcon = AC_UARTBRK; 552 mb(); 553 554 if (C_HUPCL(tty)) 555 info->MCR &= ~(SER_DTR|SER_RTS); 556 rtsdtr_ctrl(info->MCR); 557 558 set_bit(TTY_IO_ERROR, &tty->flags); 559 560 tty_port_set_initialized(&info->tport, 0); 561 local_irq_restore(flags); 562 } 563 564 565 /* 566 * This routine is called to set the UART divisor registers to match 567 * the specified baud rate for a serial port. 568 */ 569 static void change_speed(struct tty_struct *tty, struct serial_state *info, 570 struct ktermios *old_termios) 571 { 572 struct tty_port *port = &info->tport; 573 int quot = 0, baud_base, baud; 574 unsigned cflag, cval = 0; 575 int bits; 576 unsigned long flags; 577 578 cflag = tty->termios.c_cflag; 579 580 /* Byte size is always 8 bits plus parity bit if requested */ 581 582 cval = 3; bits = 10; 583 if (cflag & CSTOPB) { 584 cval |= 0x04; 585 bits++; 586 } 587 if (cflag & PARENB) { 588 cval |= UART_LCR_PARITY; 589 bits++; 590 } 591 if (!(cflag & PARODD)) 592 cval |= UART_LCR_EPAR; 593 #ifdef CMSPAR 594 if (cflag & CMSPAR) 595 cval |= UART_LCR_SPAR; 596 #endif 597 598 /* Determine divisor based on baud rate */ 599 baud = tty_get_baud_rate(tty); 600 if (!baud) 601 baud = 9600; /* B0 transition handled in rs_set_termios */ 602 baud_base = info->baud_base; 603 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 604 quot = info->custom_divisor; 605 else { 606 if (baud == 134) 607 /* Special case since 134 is really 134.5 */ 608 quot = (2*baud_base / 269); 609 else if (baud) 610 quot = baud_base / baud; 611 } 612 /* If the quotient is zero refuse the change */ 613 if (!quot && old_termios) { 614 /* FIXME: Will need updating for new tty in the end */ 615 tty->termios.c_cflag &= ~CBAUD; 616 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 617 baud = tty_get_baud_rate(tty); 618 if (!baud) 619 baud = 9600; 620 if (baud == 38400 && 621 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 622 quot = info->custom_divisor; 623 else { 624 if (baud == 134) 625 /* Special case since 134 is really 134.5 */ 626 quot = (2*baud_base / 269); 627 else if (baud) 628 quot = baud_base / baud; 629 } 630 } 631 /* As a last resort, if the quotient is zero, default to 9600 bps */ 632 if (!quot) 633 quot = baud_base / 9600; 634 info->quot = quot; 635 info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base; 636 info->timeout += HZ/50; /* Add .02 seconds of slop */ 637 638 /* CTS flow control flag and modem status interrupts */ 639 info->IER &= ~UART_IER_MSI; 640 if (port->flags & ASYNC_HARDPPS_CD) 641 info->IER |= UART_IER_MSI; 642 tty_port_set_cts_flow(port, cflag & CRTSCTS); 643 if (cflag & CRTSCTS) 644 info->IER |= UART_IER_MSI; 645 tty_port_set_check_carrier(port, ~cflag & CLOCAL); 646 if (~cflag & CLOCAL) 647 info->IER |= UART_IER_MSI; 648 /* TBD: 649 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 650 */ 651 652 /* 653 * Set up parity check flag 654 */ 655 656 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 657 if (I_INPCK(tty)) 658 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 659 if (I_BRKINT(tty) || I_PARMRK(tty)) 660 info->read_status_mask |= UART_LSR_BI; 661 662 /* 663 * Characters to ignore 664 */ 665 info->ignore_status_mask = 0; 666 if (I_IGNPAR(tty)) 667 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 668 if (I_IGNBRK(tty)) { 669 info->ignore_status_mask |= UART_LSR_BI; 670 /* 671 * If we're ignore parity and break indicators, ignore 672 * overruns too. (For real raw support). 673 */ 674 if (I_IGNPAR(tty)) 675 info->ignore_status_mask |= UART_LSR_OE; 676 } 677 /* 678 * !!! ignore all characters if CREAD is not set 679 */ 680 if ((cflag & CREAD) == 0) 681 info->ignore_status_mask |= UART_LSR_DR; 682 local_irq_save(flags); 683 684 { 685 short serper; 686 687 /* Set up the baud rate */ 688 serper = quot - 1; 689 690 /* Enable or disable parity bit */ 691 692 if(cval & UART_LCR_PARITY) 693 serper |= (SERPER_PARENB); 694 695 amiga_custom.serper = serper; 696 mb(); 697 } 698 699 local_irq_restore(flags); 700 } 701 702 static int rs_put_char(struct tty_struct *tty, unsigned char ch) 703 { 704 struct serial_state *info; 705 unsigned long flags; 706 707 info = tty->driver_data; 708 709 if (!info->xmit.buf) 710 return 0; 711 712 local_irq_save(flags); 713 if (CIRC_SPACE(info->xmit.head, 714 info->xmit.tail, 715 SERIAL_XMIT_SIZE) == 0) { 716 local_irq_restore(flags); 717 return 0; 718 } 719 720 info->xmit.buf[info->xmit.head++] = ch; 721 info->xmit.head &= SERIAL_XMIT_SIZE-1; 722 local_irq_restore(flags); 723 return 1; 724 } 725 726 static void rs_flush_chars(struct tty_struct *tty) 727 { 728 struct serial_state *info = tty->driver_data; 729 unsigned long flags; 730 731 if (info->xmit.head == info->xmit.tail 732 || tty->flow.stopped 733 || tty->hw_stopped 734 || !info->xmit.buf) 735 return; 736 737 local_irq_save(flags); 738 info->IER |= UART_IER_THRI; 739 amiga_custom.intena = IF_SETCLR | IF_TBE; 740 mb(); 741 /* set a pending Tx Interrupt, transmitter should restart now */ 742 amiga_custom.intreq = IF_SETCLR | IF_TBE; 743 mb(); 744 local_irq_restore(flags); 745 } 746 747 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count) 748 { 749 int c, ret = 0; 750 struct serial_state *info = tty->driver_data; 751 unsigned long flags; 752 753 if (!info->xmit.buf) 754 return 0; 755 756 local_irq_save(flags); 757 while (1) { 758 c = CIRC_SPACE_TO_END(info->xmit.head, 759 info->xmit.tail, 760 SERIAL_XMIT_SIZE); 761 if (count < c) 762 c = count; 763 if (c <= 0) { 764 break; 765 } 766 memcpy(info->xmit.buf + info->xmit.head, buf, c); 767 info->xmit.head = ((info->xmit.head + c) & 768 (SERIAL_XMIT_SIZE-1)); 769 buf += c; 770 count -= c; 771 ret += c; 772 } 773 local_irq_restore(flags); 774 775 if (info->xmit.head != info->xmit.tail 776 && !tty->flow.stopped 777 && !tty->hw_stopped 778 && !(info->IER & UART_IER_THRI)) { 779 info->IER |= UART_IER_THRI; 780 local_irq_disable(); 781 amiga_custom.intena = IF_SETCLR | IF_TBE; 782 mb(); 783 /* set a pending Tx Interrupt, transmitter should restart now */ 784 amiga_custom.intreq = IF_SETCLR | IF_TBE; 785 mb(); 786 local_irq_restore(flags); 787 } 788 return ret; 789 } 790 791 static unsigned int rs_write_room(struct tty_struct *tty) 792 { 793 struct serial_state *info = tty->driver_data; 794 795 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 796 } 797 798 static unsigned int rs_chars_in_buffer(struct tty_struct *tty) 799 { 800 struct serial_state *info = tty->driver_data; 801 802 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE); 803 } 804 805 static void rs_flush_buffer(struct tty_struct *tty) 806 { 807 struct serial_state *info = tty->driver_data; 808 unsigned long flags; 809 810 local_irq_save(flags); 811 info->xmit.head = info->xmit.tail = 0; 812 local_irq_restore(flags); 813 tty_wakeup(tty); 814 } 815 816 /* 817 * This function is used to send a high-priority XON/XOFF character to 818 * the device 819 */ 820 static void rs_send_xchar(struct tty_struct *tty, char ch) 821 { 822 struct serial_state *info = tty->driver_data; 823 unsigned long flags; 824 825 info->x_char = ch; 826 if (ch) { 827 /* Make sure transmit interrupts are on */ 828 829 /* Check this ! */ 830 local_irq_save(flags); 831 if(!(amiga_custom.intenar & IF_TBE)) { 832 amiga_custom.intena = IF_SETCLR | IF_TBE; 833 mb(); 834 /* set a pending Tx Interrupt, transmitter should restart now */ 835 amiga_custom.intreq = IF_SETCLR | IF_TBE; 836 mb(); 837 } 838 local_irq_restore(flags); 839 840 info->IER |= UART_IER_THRI; 841 } 842 } 843 844 /* 845 * ------------------------------------------------------------ 846 * rs_throttle() 847 * 848 * This routine is called by the upper-layer tty layer to signal that 849 * incoming characters should be throttled. 850 * ------------------------------------------------------------ 851 */ 852 static void rs_throttle(struct tty_struct * tty) 853 { 854 struct serial_state *info = tty->driver_data; 855 unsigned long flags; 856 #ifdef SERIAL_DEBUG_THROTTLE 857 printk("throttle %s ....\n", tty_name(tty)); 858 #endif 859 860 if (I_IXOFF(tty)) 861 rs_send_xchar(tty, STOP_CHAR(tty)); 862 863 if (C_CRTSCTS(tty)) 864 info->MCR &= ~SER_RTS; 865 866 local_irq_save(flags); 867 rtsdtr_ctrl(info->MCR); 868 local_irq_restore(flags); 869 } 870 871 static void rs_unthrottle(struct tty_struct * tty) 872 { 873 struct serial_state *info = tty->driver_data; 874 unsigned long flags; 875 #ifdef SERIAL_DEBUG_THROTTLE 876 printk("unthrottle %s ....\n", tty_name(tty)); 877 #endif 878 879 if (I_IXOFF(tty)) { 880 if (info->x_char) 881 info->x_char = 0; 882 else 883 rs_send_xchar(tty, START_CHAR(tty)); 884 } 885 if (C_CRTSCTS(tty)) 886 info->MCR |= SER_RTS; 887 local_irq_save(flags); 888 rtsdtr_ctrl(info->MCR); 889 local_irq_restore(flags); 890 } 891 892 /* 893 * ------------------------------------------------------------ 894 * rs_ioctl() and friends 895 * ------------------------------------------------------------ 896 */ 897 898 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss) 899 { 900 struct serial_state *state = tty->driver_data; 901 unsigned int close_delay, closing_wait; 902 903 tty_lock(tty); 904 close_delay = jiffies_to_msecs(state->tport.close_delay) / 10; 905 closing_wait = state->tport.closing_wait; 906 if (closing_wait != ASYNC_CLOSING_WAIT_NONE) 907 closing_wait = jiffies_to_msecs(closing_wait) / 10; 908 909 ss->line = tty->index; 910 ss->port = state->port; 911 ss->flags = state->tport.flags; 912 ss->xmit_fifo_size = XMIT_FIFO_SIZE; 913 ss->baud_base = state->baud_base; 914 ss->close_delay = close_delay; 915 ss->closing_wait = closing_wait; 916 ss->custom_divisor = state->custom_divisor; 917 tty_unlock(tty); 918 return 0; 919 } 920 921 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) 922 { 923 struct serial_state *state = tty->driver_data; 924 struct tty_port *port = &state->tport; 925 bool change_spd; 926 int retval = 0; 927 unsigned int close_delay, closing_wait; 928 929 tty_lock(tty); 930 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) || 931 ss->custom_divisor != state->custom_divisor; 932 if (ss->irq || ss->port != state->port || 933 ss->xmit_fifo_size != XMIT_FIFO_SIZE) { 934 tty_unlock(tty); 935 return -EINVAL; 936 } 937 938 close_delay = msecs_to_jiffies(ss->close_delay * 10); 939 closing_wait = ss->closing_wait; 940 if (closing_wait != ASYNC_CLOSING_WAIT_NONE) 941 closing_wait = msecs_to_jiffies(closing_wait * 10); 942 943 if (!capable(CAP_SYS_ADMIN)) { 944 if ((ss->baud_base != state->baud_base) || 945 (close_delay != port->close_delay) || 946 (closing_wait != port->closing_wait) || 947 ((ss->flags & ~ASYNC_USR_MASK) != 948 (port->flags & ~ASYNC_USR_MASK))) { 949 tty_unlock(tty); 950 return -EPERM; 951 } 952 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 953 (ss->flags & ASYNC_USR_MASK)); 954 state->custom_divisor = ss->custom_divisor; 955 goto check_and_exit; 956 } 957 958 if (ss->baud_base < 9600) { 959 tty_unlock(tty); 960 return -EINVAL; 961 } 962 963 /* 964 * OK, past this point, all the error checking has been done. 965 * At this point, we start making changes..... 966 */ 967 968 state->baud_base = ss->baud_base; 969 port->flags = ((port->flags & ~ASYNC_FLAGS) | 970 (ss->flags & ASYNC_FLAGS)); 971 state->custom_divisor = ss->custom_divisor; 972 port->close_delay = close_delay; 973 port->closing_wait = closing_wait; 974 975 check_and_exit: 976 if (tty_port_initialized(port)) { 977 if (change_spd) { 978 /* warn about deprecation unless clearing */ 979 if (ss->flags & ASYNC_SPD_MASK) 980 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); 981 change_speed(tty, state, NULL); 982 } 983 } else 984 retval = startup(tty, state); 985 tty_unlock(tty); 986 return retval; 987 } 988 989 /* 990 * get_lsr_info - get line status register info 991 * 992 * Purpose: Let user call ioctl() to get info when the UART physically 993 * is emptied. On bus types like RS485, the transmitter must 994 * release the bus after transmitting. This must be done when 995 * the transmit shift register is empty, not be done when the 996 * transmit holding register is empty. This functionality 997 * allows an RS485 driver to be written in user space. 998 */ 999 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 1000 { 1001 unsigned char status; 1002 unsigned int result; 1003 unsigned long flags; 1004 1005 local_irq_save(flags); 1006 status = amiga_custom.serdatr; 1007 mb(); 1008 local_irq_restore(flags); 1009 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1010 if (copy_to_user(value, &result, sizeof(int))) 1011 return -EFAULT; 1012 return 0; 1013 } 1014 1015 1016 static int rs_tiocmget(struct tty_struct *tty) 1017 { 1018 struct serial_state *info = tty->driver_data; 1019 unsigned char control, status; 1020 unsigned long flags; 1021 1022 if (tty_io_error(tty)) 1023 return -EIO; 1024 1025 control = info->MCR; 1026 local_irq_save(flags); 1027 status = ciab.pra; 1028 local_irq_restore(flags); 1029 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1030 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1031 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1032 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1033 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1034 } 1035 1036 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1037 unsigned int clear) 1038 { 1039 struct serial_state *info = tty->driver_data; 1040 unsigned long flags; 1041 1042 if (tty_io_error(tty)) 1043 return -EIO; 1044 1045 local_irq_save(flags); 1046 if (set & TIOCM_RTS) 1047 info->MCR |= SER_RTS; 1048 if (set & TIOCM_DTR) 1049 info->MCR |= SER_DTR; 1050 if (clear & TIOCM_RTS) 1051 info->MCR &= ~SER_RTS; 1052 if (clear & TIOCM_DTR) 1053 info->MCR &= ~SER_DTR; 1054 rtsdtr_ctrl(info->MCR); 1055 local_irq_restore(flags); 1056 return 0; 1057 } 1058 1059 /* 1060 * rs_break() --- routine which turns the break handling on or off 1061 */ 1062 static int rs_break(struct tty_struct *tty, int break_state) 1063 { 1064 unsigned long flags; 1065 1066 local_irq_save(flags); 1067 if (break_state == -1) 1068 amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK; 1069 else 1070 amiga_custom.adkcon = AC_UARTBRK; 1071 mb(); 1072 local_irq_restore(flags); 1073 return 0; 1074 } 1075 1076 /* 1077 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1078 * Return: write counters to the user passed counter struct 1079 * NB: both 1->0 and 0->1 transitions are counted except for 1080 * RI where only 0->1 is counted. 1081 */ 1082 static int rs_get_icount(struct tty_struct *tty, 1083 struct serial_icounter_struct *icount) 1084 { 1085 struct serial_state *info = tty->driver_data; 1086 struct async_icount cnow; 1087 unsigned long flags; 1088 1089 local_irq_save(flags); 1090 cnow = info->icount; 1091 local_irq_restore(flags); 1092 icount->cts = cnow.cts; 1093 icount->dsr = cnow.dsr; 1094 icount->rng = cnow.rng; 1095 icount->dcd = cnow.dcd; 1096 icount->rx = cnow.rx; 1097 icount->tx = cnow.tx; 1098 icount->frame = cnow.frame; 1099 icount->overrun = cnow.overrun; 1100 icount->parity = cnow.parity; 1101 icount->brk = cnow.brk; 1102 icount->buf_overrun = cnow.buf_overrun; 1103 1104 return 0; 1105 } 1106 1107 static int rs_ioctl(struct tty_struct *tty, 1108 unsigned int cmd, unsigned long arg) 1109 { 1110 struct serial_state *info = tty->driver_data; 1111 struct async_icount cprev, cnow; /* kernel counter temps */ 1112 void __user *argp = (void __user *)arg; 1113 unsigned long flags; 1114 DEFINE_WAIT(wait); 1115 int ret; 1116 1117 if ((cmd != TIOCSERCONFIG) && 1118 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1119 if (tty_io_error(tty)) 1120 return -EIO; 1121 } 1122 1123 switch (cmd) { 1124 case TIOCSERCONFIG: 1125 return 0; 1126 1127 case TIOCSERGETLSR: /* Get line status register */ 1128 return get_lsr_info(info, argp); 1129 1130 /* 1131 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1132 * - mask passed in arg for lines of interest 1133 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1134 * Caller should use TIOCGICOUNT to see which one it was 1135 */ 1136 case TIOCMIWAIT: 1137 local_irq_save(flags); 1138 /* note the counters on entry */ 1139 cprev = info->icount; 1140 local_irq_restore(flags); 1141 while (1) { 1142 prepare_to_wait(&info->tport.delta_msr_wait, 1143 &wait, TASK_INTERRUPTIBLE); 1144 local_irq_save(flags); 1145 cnow = info->icount; /* atomic copy */ 1146 local_irq_restore(flags); 1147 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 1148 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) { 1149 ret = -EIO; /* no change => error */ 1150 break; 1151 } 1152 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1153 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1154 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1155 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1156 ret = 0; 1157 break; 1158 } 1159 schedule(); 1160 /* see if a signal did it */ 1161 if (signal_pending(current)) { 1162 ret = -ERESTARTSYS; 1163 break; 1164 } 1165 cprev = cnow; 1166 } 1167 finish_wait(&info->tport.delta_msr_wait, &wait); 1168 return ret; 1169 1170 default: 1171 return -ENOIOCTLCMD; 1172 } 1173 return 0; 1174 } 1175 1176 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) 1177 { 1178 struct serial_state *info = tty->driver_data; 1179 unsigned long flags; 1180 unsigned int cflag = tty->termios.c_cflag; 1181 1182 change_speed(tty, info, old_termios); 1183 1184 /* Handle transition to B0 status */ 1185 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { 1186 info->MCR &= ~(SER_DTR|SER_RTS); 1187 local_irq_save(flags); 1188 rtsdtr_ctrl(info->MCR); 1189 local_irq_restore(flags); 1190 } 1191 1192 /* Handle transition away from B0 status */ 1193 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1194 info->MCR |= SER_DTR; 1195 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 1196 info->MCR |= SER_RTS; 1197 local_irq_save(flags); 1198 rtsdtr_ctrl(info->MCR); 1199 local_irq_restore(flags); 1200 } 1201 1202 /* Handle turning off CRTSCTS */ 1203 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 1204 tty->hw_stopped = 0; 1205 rs_start(tty); 1206 } 1207 1208 #if 0 1209 /* 1210 * No need to wake up processes in open wait, since they 1211 * sample the CLOCAL flag once, and don't recheck it. 1212 * XXX It's not clear whether the current behavior is correct 1213 * or not. Hence, this may change..... 1214 */ 1215 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1216 wake_up_interruptible(&info->open_wait); 1217 #endif 1218 } 1219 1220 /* 1221 * ------------------------------------------------------------ 1222 * rs_close() 1223 * 1224 * This routine is called when the serial port gets closed. First, we 1225 * wait for the last remaining data to be sent. Then, we unlink its 1226 * async structure from the interrupt chain if necessary, and we free 1227 * that IRQ if nothing is left in the chain. 1228 * ------------------------------------------------------------ 1229 */ 1230 static void rs_close(struct tty_struct *tty, struct file * filp) 1231 { 1232 struct serial_state *state = tty->driver_data; 1233 struct tty_port *port = &state->tport; 1234 1235 if (tty_port_close_start(port, tty, filp) == 0) 1236 return; 1237 1238 /* 1239 * At this point we stop accepting input. To do this, we 1240 * disable the receive line status interrupts, and tell the 1241 * interrupt driver to stop checking the data ready bit in the 1242 * line status register. 1243 */ 1244 state->read_status_mask &= ~UART_LSR_DR; 1245 if (tty_port_initialized(port)) { 1246 /* disable receive interrupts */ 1247 amiga_custom.intena = IF_RBF; 1248 mb(); 1249 /* clear any pending receive interrupt */ 1250 amiga_custom.intreq = IF_RBF; 1251 mb(); 1252 1253 /* 1254 * Before we drop DTR, make sure the UART transmitter 1255 * has completely drained; this is especially 1256 * important if there is a transmit FIFO! 1257 */ 1258 rs_wait_until_sent(tty, state->timeout); 1259 } 1260 shutdown(tty, state); 1261 rs_flush_buffer(tty); 1262 1263 tty_ldisc_flush(tty); 1264 port->tty = NULL; 1265 1266 tty_port_close_end(port, tty); 1267 } 1268 1269 /* 1270 * rs_wait_until_sent() --- wait until the transmitter is empty 1271 */ 1272 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1273 { 1274 struct serial_state *info = tty->driver_data; 1275 unsigned long orig_jiffies, char_time; 1276 int lsr; 1277 1278 orig_jiffies = jiffies; 1279 1280 /* 1281 * Set the check interval to be 1/5 of the estimated time to 1282 * send a single character, and make it at least 1. The check 1283 * interval should also be less than the timeout. 1284 * 1285 * Note: we have to use pretty tight timings here to satisfy 1286 * the NIST-PCTS. 1287 */ 1288 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE; 1289 char_time = char_time / 5; 1290 if (char_time == 0) 1291 char_time = 1; 1292 if (timeout) 1293 char_time = min_t(unsigned long, char_time, timeout); 1294 /* 1295 * If the transmitter hasn't cleared in twice the approximate 1296 * amount of time to send the entire FIFO, it probably won't 1297 * ever clear. This assumes the UART isn't doing flow 1298 * control, which is currently the case. Hence, if it ever 1299 * takes longer than info->timeout, this is probably due to a 1300 * UART bug of some kind. So, we clamp the timeout parameter at 1301 * 2*info->timeout. 1302 */ 1303 if (!timeout || timeout > 2*info->timeout) 1304 timeout = 2*info->timeout; 1305 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1306 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1307 printk("jiff=%lu...", jiffies); 1308 #endif 1309 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) { 1310 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1311 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1312 #endif 1313 msleep_interruptible(jiffies_to_msecs(char_time)); 1314 if (signal_pending(current)) 1315 break; 1316 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1317 break; 1318 } 1319 __set_current_state(TASK_RUNNING); 1320 1321 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1322 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1323 #endif 1324 } 1325 1326 /* 1327 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1328 */ 1329 static void rs_hangup(struct tty_struct *tty) 1330 { 1331 struct serial_state *info = tty->driver_data; 1332 1333 rs_flush_buffer(tty); 1334 shutdown(tty, info); 1335 info->tport.count = 0; 1336 tty_port_set_active(&info->tport, 0); 1337 info->tport.tty = NULL; 1338 wake_up_interruptible(&info->tport.open_wait); 1339 } 1340 1341 /* 1342 * This routine is called whenever a serial port is opened. It 1343 * enables interrupts for a serial port, linking in its async structure into 1344 * the IRQ chain. It also performs the serial-specific 1345 * initialization for the tty structure. 1346 */ 1347 static int rs_open(struct tty_struct *tty, struct file * filp) 1348 { 1349 struct tty_port *port = tty->port; 1350 struct serial_state *info = container_of(port, struct serial_state, 1351 tport); 1352 int retval; 1353 1354 port->count++; 1355 port->tty = tty; 1356 tty->driver_data = info; 1357 1358 retval = startup(tty, info); 1359 if (retval) { 1360 return retval; 1361 } 1362 1363 return tty_port_block_til_ready(port, tty, filp); 1364 } 1365 1366 /* 1367 * /proc fs routines.... 1368 */ 1369 1370 static inline void line_info(struct seq_file *m, int line, 1371 struct serial_state *state) 1372 { 1373 char stat_buf[30], control, status; 1374 unsigned long flags; 1375 1376 seq_printf(m, "%d: uart:amiga_builtin", line); 1377 1378 local_irq_save(flags); 1379 status = ciab.pra; 1380 control = tty_port_initialized(&state->tport) ? state->MCR : status; 1381 local_irq_restore(flags); 1382 1383 stat_buf[0] = 0; 1384 stat_buf[1] = 0; 1385 if(!(control & SER_RTS)) 1386 strcat(stat_buf, "|RTS"); 1387 if(!(status & SER_CTS)) 1388 strcat(stat_buf, "|CTS"); 1389 if(!(control & SER_DTR)) 1390 strcat(stat_buf, "|DTR"); 1391 if(!(status & SER_DSR)) 1392 strcat(stat_buf, "|DSR"); 1393 if(!(status & SER_DCD)) 1394 strcat(stat_buf, "|CD"); 1395 1396 if (state->quot) 1397 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1398 1399 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1400 1401 if (state->icount.frame) 1402 seq_printf(m, " fe:%d", state->icount.frame); 1403 1404 if (state->icount.parity) 1405 seq_printf(m, " pe:%d", state->icount.parity); 1406 1407 if (state->icount.brk) 1408 seq_printf(m, " brk:%d", state->icount.brk); 1409 1410 if (state->icount.overrun) 1411 seq_printf(m, " oe:%d", state->icount.overrun); 1412 1413 /* 1414 * Last thing is the RS-232 status lines 1415 */ 1416 seq_printf(m, " %s\n", stat_buf+1); 1417 } 1418 1419 static int rs_proc_show(struct seq_file *m, void *v) 1420 { 1421 seq_printf(m, "serinfo:1.0 driver:4.30\n"); 1422 line_info(m, 0, &serial_state); 1423 return 0; 1424 } 1425 1426 /* 1427 * --------------------------------------------------------------------- 1428 * rs_init() and friends 1429 * 1430 * rs_init() is called at boot-time to initialize the serial driver. 1431 * --------------------------------------------------------------------- 1432 */ 1433 1434 static const struct tty_operations serial_ops = { 1435 .open = rs_open, 1436 .close = rs_close, 1437 .write = rs_write, 1438 .put_char = rs_put_char, 1439 .flush_chars = rs_flush_chars, 1440 .write_room = rs_write_room, 1441 .chars_in_buffer = rs_chars_in_buffer, 1442 .flush_buffer = rs_flush_buffer, 1443 .ioctl = rs_ioctl, 1444 .throttle = rs_throttle, 1445 .unthrottle = rs_unthrottle, 1446 .set_termios = rs_set_termios, 1447 .stop = rs_stop, 1448 .start = rs_start, 1449 .hangup = rs_hangup, 1450 .break_ctl = rs_break, 1451 .send_xchar = rs_send_xchar, 1452 .wait_until_sent = rs_wait_until_sent, 1453 .tiocmget = rs_tiocmget, 1454 .tiocmset = rs_tiocmset, 1455 .get_icount = rs_get_icount, 1456 .set_serial = set_serial_info, 1457 .get_serial = get_serial_info, 1458 .proc_show = rs_proc_show, 1459 }; 1460 1461 static int amiga_carrier_raised(struct tty_port *port) 1462 { 1463 return !(ciab.pra & SER_DCD); 1464 } 1465 1466 static void amiga_dtr_rts(struct tty_port *port, int raise) 1467 { 1468 struct serial_state *info = container_of(port, struct serial_state, 1469 tport); 1470 unsigned long flags; 1471 1472 if (raise) 1473 info->MCR |= SER_DTR|SER_RTS; 1474 else 1475 info->MCR &= ~(SER_DTR|SER_RTS); 1476 1477 local_irq_save(flags); 1478 rtsdtr_ctrl(info->MCR); 1479 local_irq_restore(flags); 1480 } 1481 1482 static const struct tty_port_operations amiga_port_ops = { 1483 .carrier_raised = amiga_carrier_raised, 1484 .dtr_rts = amiga_dtr_rts, 1485 }; 1486 1487 /* 1488 * The serial driver boot-time initialization code! 1489 */ 1490 static int __init amiga_serial_probe(struct platform_device *pdev) 1491 { 1492 struct serial_state *state = &serial_state; 1493 struct tty_driver *driver; 1494 unsigned long flags; 1495 int error; 1496 1497 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW); 1498 if (IS_ERR(driver)) 1499 return PTR_ERR(driver); 1500 1501 /* Initialize the tty_driver structure */ 1502 1503 driver->driver_name = "amiserial"; 1504 driver->name = "ttyS"; 1505 driver->major = TTY_MAJOR; 1506 driver->minor_start = 64; 1507 driver->type = TTY_DRIVER_TYPE_SERIAL; 1508 driver->subtype = SERIAL_TYPE_NORMAL; 1509 driver->init_termios = tty_std_termios; 1510 driver->init_termios.c_cflag = 1511 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1512 tty_set_operations(driver, &serial_ops); 1513 1514 memset(state, 0, sizeof(*state)); 1515 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */ 1516 tty_port_init(&state->tport); 1517 state->tport.ops = &amiga_port_ops; 1518 tty_port_link_device(&state->tport, driver, 0); 1519 1520 error = tty_register_driver(driver); 1521 if (error) 1522 goto fail_tty_driver_kref_put; 1523 1524 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1525 1526 /* Hardware set up */ 1527 1528 state->baud_base = amiga_colorclock; 1529 1530 /* set ISRs, and then disable the rx interrupts */ 1531 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1532 if (error) 1533 goto fail_unregister; 1534 1535 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1536 "serial RX", state); 1537 if (error) 1538 goto fail_free_irq; 1539 1540 local_irq_save(flags); 1541 1542 /* turn off Rx and Tx interrupts */ 1543 amiga_custom.intena = IF_RBF | IF_TBE; 1544 mb(); 1545 1546 /* clear any pending interrupt */ 1547 amiga_custom.intreq = IF_RBF | IF_TBE; 1548 mb(); 1549 1550 local_irq_restore(flags); 1551 1552 /* 1553 * set the appropriate directions for the modem control flags, 1554 * and clear RTS and DTR 1555 */ 1556 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1557 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1558 1559 platform_set_drvdata(pdev, state); 1560 1561 serial_driver = driver; 1562 1563 return 0; 1564 1565 fail_free_irq: 1566 free_irq(IRQ_AMIGA_TBE, state); 1567 fail_unregister: 1568 tty_unregister_driver(driver); 1569 fail_tty_driver_kref_put: 1570 tty_port_destroy(&state->tport); 1571 tty_driver_kref_put(driver); 1572 return error; 1573 } 1574 1575 static int __exit amiga_serial_remove(struct platform_device *pdev) 1576 { 1577 struct serial_state *state = platform_get_drvdata(pdev); 1578 1579 tty_unregister_driver(serial_driver); 1580 tty_driver_kref_put(serial_driver); 1581 tty_port_destroy(&state->tport); 1582 1583 free_irq(IRQ_AMIGA_TBE, state); 1584 free_irq(IRQ_AMIGA_RBF, state); 1585 1586 return 0; 1587 } 1588 1589 static struct platform_driver amiga_serial_driver = { 1590 .remove = __exit_p(amiga_serial_remove), 1591 .driver = { 1592 .name = "amiga-serial", 1593 }, 1594 }; 1595 1596 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1597 1598 1599 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1600 1601 /* 1602 * ------------------------------------------------------------ 1603 * Serial console driver 1604 * ------------------------------------------------------------ 1605 */ 1606 1607 static void amiga_serial_putc(char c) 1608 { 1609 amiga_custom.serdat = (unsigned char)c | 0x100; 1610 while (!(amiga_custom.serdatr & 0x2000)) 1611 barrier(); 1612 } 1613 1614 /* 1615 * Print a string to the serial port trying not to disturb 1616 * any possible real use of the port... 1617 * 1618 * The console must be locked when we get here. 1619 */ 1620 static void serial_console_write(struct console *co, const char *s, 1621 unsigned count) 1622 { 1623 unsigned short intena = amiga_custom.intenar; 1624 1625 amiga_custom.intena = IF_TBE; 1626 1627 while (count--) { 1628 if (*s == '\n') 1629 amiga_serial_putc('\r'); 1630 amiga_serial_putc(*s++); 1631 } 1632 1633 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE); 1634 } 1635 1636 static struct tty_driver *serial_console_device(struct console *c, int *index) 1637 { 1638 *index = 0; 1639 return serial_driver; 1640 } 1641 1642 static struct console sercons = { 1643 .name = "ttyS", 1644 .write = serial_console_write, 1645 .device = serial_console_device, 1646 .flags = CON_PRINTBUFFER, 1647 .index = -1, 1648 }; 1649 1650 /* 1651 * Register console. 1652 */ 1653 static int __init amiserial_console_init(void) 1654 { 1655 if (!MACH_IS_AMIGA) 1656 return -ENODEV; 1657 1658 register_console(&sercons); 1659 return 0; 1660 } 1661 console_initcall(amiserial_console_init); 1662 1663 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1664 1665 MODULE_LICENSE("GPL"); 1666 MODULE_ALIAS("platform:amiga-serial"); 1667