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