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 u8 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 u8 ch, flag; 182 struct async_icount *icount; 183 bool overrun = false; 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 return; 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 overrun = true; 255 } 256 } 257 tty_insert_flip_char(&info->tport, ch, flag); 258 if (overrun) 259 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN); 260 tty_flip_buffer_push(&info->tport); 261 } 262 263 static void transmit_chars(struct serial_state *info) 264 { 265 amiga_custom.intreq = IF_TBE; 266 mb(); 267 if (info->x_char) { 268 amiga_custom.serdat = info->x_char | 0x100; 269 mb(); 270 info->icount.tx++; 271 info->x_char = 0; 272 return; 273 } 274 if (info->xmit.head == info->xmit.tail 275 || info->tport.tty->flow.stopped 276 || info->tport.tty->hw_stopped) { 277 info->IER &= ~UART_IER_THRI; 278 amiga_custom.intena = IF_TBE; 279 mb(); 280 return; 281 } 282 283 amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100; 284 mb(); 285 info->xmit.tail = info->xmit.tail & (UART_XMIT_SIZE - 1); 286 info->icount.tx++; 287 288 if (CIRC_CNT(info->xmit.head, 289 info->xmit.tail, 290 UART_XMIT_SIZE) < WAKEUP_CHARS) 291 tty_wakeup(info->tport.tty); 292 293 #ifdef SERIAL_DEBUG_INTR 294 printk("THRE..."); 295 #endif 296 if (info->xmit.head == info->xmit.tail) { 297 amiga_custom.intena = IF_TBE; 298 mb(); 299 info->IER &= ~UART_IER_THRI; 300 } 301 } 302 303 static void check_modem_status(struct serial_state *info) 304 { 305 struct tty_port *port = &info->tport; 306 unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 307 unsigned char dstatus; 308 struct async_icount *icount; 309 310 /* Determine bits that have changed */ 311 dstatus = status ^ current_ctl_bits; 312 current_ctl_bits = status; 313 314 if (dstatus) { 315 icount = &info->icount; 316 /* update input line counters */ 317 if (dstatus & SER_DSR) 318 icount->dsr++; 319 if (dstatus & SER_DCD) { 320 icount->dcd++; 321 } 322 if (dstatus & SER_CTS) 323 icount->cts++; 324 wake_up_interruptible(&port->delta_msr_wait); 325 } 326 327 if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) { 328 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) 329 printk("ttyS%d CD now %s...", info->line, 330 (!(status & SER_DCD)) ? "on" : "off"); 331 #endif 332 if (!(status & SER_DCD)) 333 wake_up_interruptible(&port->open_wait); 334 else { 335 #ifdef SERIAL_DEBUG_OPEN 336 printk("doing serial hangup..."); 337 #endif 338 if (port->tty) 339 tty_hangup(port->tty); 340 } 341 } 342 if (tty_port_cts_enabled(port)) { 343 if (port->tty->hw_stopped) { 344 if (!(status & SER_CTS)) { 345 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 346 printk("CTS tx start..."); 347 #endif 348 port->tty->hw_stopped = false; 349 info->IER |= UART_IER_THRI; 350 amiga_custom.intena = IF_SETCLR | IF_TBE; 351 mb(); 352 /* set a pending Tx Interrupt, transmitter should restart now */ 353 amiga_custom.intreq = IF_SETCLR | IF_TBE; 354 mb(); 355 tty_wakeup(port->tty); 356 return; 357 } 358 } else { 359 if ((status & SER_CTS)) { 360 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW)) 361 printk("CTS tx stop..."); 362 #endif 363 port->tty->hw_stopped = true; 364 info->IER &= ~UART_IER_THRI; 365 /* disable Tx interrupt and remove any pending interrupts */ 366 amiga_custom.intena = IF_TBE; 367 mb(); 368 amiga_custom.intreq = IF_TBE; 369 mb(); 370 } 371 } 372 } 373 } 374 375 static irqreturn_t ser_vbl_int( int irq, void *data) 376 { 377 /* vbl is just a periodic interrupt we tie into to update modem status */ 378 struct serial_state *info = data; 379 /* 380 * TBD - is it better to unregister from this interrupt or to 381 * ignore it if MSI is clear ? 382 */ 383 if(info->IER & UART_IER_MSI) 384 check_modem_status(info); 385 return IRQ_HANDLED; 386 } 387 388 static irqreturn_t ser_rx_int(int irq, void *dev_id) 389 { 390 struct serial_state *info = dev_id; 391 392 #ifdef SERIAL_DEBUG_INTR 393 printk("ser_rx_int..."); 394 #endif 395 396 if (!info->tport.tty) 397 return IRQ_NONE; 398 399 receive_chars(info); 400 #ifdef SERIAL_DEBUG_INTR 401 printk("end.\n"); 402 #endif 403 return IRQ_HANDLED; 404 } 405 406 static irqreturn_t ser_tx_int(int irq, void *dev_id) 407 { 408 struct serial_state *info = dev_id; 409 410 if (amiga_custom.serdatr & SDR_TBE) { 411 #ifdef SERIAL_DEBUG_INTR 412 printk("ser_tx_int..."); 413 #endif 414 415 if (!info->tport.tty) 416 return IRQ_NONE; 417 418 transmit_chars(info); 419 #ifdef SERIAL_DEBUG_INTR 420 printk("end.\n"); 421 #endif 422 } 423 return IRQ_HANDLED; 424 } 425 426 /* 427 * ------------------------------------------------------------------- 428 * Here ends the serial interrupt routines. 429 * ------------------------------------------------------------------- 430 */ 431 432 /* 433 * --------------------------------------------------------------- 434 * Low level utility subroutines for the serial driver: routines to 435 * figure out the appropriate timeout for an interrupt chain, routines 436 * to initialize and startup a serial port, and routines to shutdown a 437 * serial port. Useful stuff like that. 438 * --------------------------------------------------------------- 439 */ 440 441 static int rs_startup(struct tty_struct *tty, struct serial_state *info) 442 { 443 struct tty_port *port = &info->tport; 444 unsigned long flags; 445 int retval=0; 446 void *buffer; 447 448 buffer = kzalloc(PAGE_SIZE, GFP_KERNEL); 449 if (!buffer) 450 return -ENOMEM; 451 452 local_irq_save(flags); 453 454 if (tty_port_initialized(port)) { 455 kfree(buffer); 456 goto errout; 457 } 458 459 if (info->xmit.buf) 460 kfree(buffer); 461 else 462 info->xmit.buf = buffer; 463 464 #ifdef SERIAL_DEBUG_OPEN 465 printk("starting up ttys%d ...", info->line); 466 #endif 467 468 /* Clear anything in the input buffer */ 469 470 amiga_custom.intreq = IF_RBF; 471 mb(); 472 473 retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info); 474 if (retval) { 475 if (capable(CAP_SYS_ADMIN)) { 476 set_bit(TTY_IO_ERROR, &tty->flags); 477 retval = 0; 478 } 479 goto errout; 480 } 481 482 /* enable both Rx and Tx interrupts */ 483 amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE; 484 mb(); 485 info->IER = UART_IER_MSI; 486 487 /* remember current state of the DCD and CTS bits */ 488 current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR); 489 490 info->MCR = 0; 491 if (C_BAUD(tty)) 492 info->MCR = SER_DTR | SER_RTS; 493 rtsdtr_ctrl(info->MCR); 494 495 clear_bit(TTY_IO_ERROR, &tty->flags); 496 info->xmit.head = info->xmit.tail = 0; 497 498 /* 499 * and set the speed of the serial port 500 */ 501 change_speed(tty, info, NULL); 502 503 tty_port_set_initialized(port, true); 504 local_irq_restore(flags); 505 return 0; 506 507 errout: 508 local_irq_restore(flags); 509 return retval; 510 } 511 512 /* 513 * This routine will shutdown a serial port; interrupts are disabled, and 514 * DTR is dropped if the hangup on close termio flag is on. 515 */ 516 static void rs_shutdown(struct tty_struct *tty, struct serial_state *info) 517 { 518 unsigned long flags; 519 520 if (!tty_port_initialized(&info->tport)) 521 return; 522 523 #ifdef SERIAL_DEBUG_OPEN 524 printk("Shutting down serial port %d ....\n", info->line); 525 #endif 526 527 local_irq_save(flags); /* Disable interrupts */ 528 529 /* 530 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq 531 * here so the queue might never be waken up 532 */ 533 wake_up_interruptible(&info->tport.delta_msr_wait); 534 535 /* 536 * Free the IRQ, if necessary 537 */ 538 free_irq(IRQ_AMIGA_VERTB, info); 539 540 kfree(info->xmit.buf); 541 info->xmit.buf = NULL; 542 543 info->IER = 0; 544 amiga_custom.intena = IF_RBF | IF_TBE; 545 mb(); 546 547 /* disable break condition */ 548 amiga_custom.adkcon = AC_UARTBRK; 549 mb(); 550 551 if (C_HUPCL(tty)) 552 info->MCR &= ~(SER_DTR|SER_RTS); 553 rtsdtr_ctrl(info->MCR); 554 555 set_bit(TTY_IO_ERROR, &tty->flags); 556 557 tty_port_set_initialized(&info->tport, false); 558 local_irq_restore(flags); 559 } 560 561 562 /* 563 * This routine is called to set the UART divisor registers to match 564 * the specified baud rate for a serial port. 565 */ 566 static void change_speed(struct tty_struct *tty, struct serial_state *info, 567 const struct ktermios *old_termios) 568 { 569 struct tty_port *port = &info->tport; 570 int quot = 0, baud_base, baud; 571 unsigned cflag, cval = 0; 572 int bits; 573 unsigned long flags; 574 575 cflag = tty->termios.c_cflag; 576 577 /* Byte size is always 8 bits plus parity bit if requested */ 578 579 cval = 3; bits = 10; 580 if (cflag & CSTOPB) { 581 cval |= 0x04; 582 bits++; 583 } 584 if (cflag & PARENB) { 585 cval |= UART_LCR_PARITY; 586 bits++; 587 } 588 if (!(cflag & PARODD)) 589 cval |= UART_LCR_EPAR; 590 if (cflag & CMSPAR) 591 cval |= UART_LCR_SPAR; 592 593 /* Determine divisor based on baud rate */ 594 baud = tty_get_baud_rate(tty); 595 if (!baud) 596 baud = 9600; /* B0 transition handled in rs_set_termios */ 597 baud_base = info->baud_base; 598 if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 599 quot = info->custom_divisor; 600 else { 601 if (baud == 134) 602 /* Special case since 134 is really 134.5 */ 603 quot = (2*baud_base / 269); 604 else if (baud) 605 quot = baud_base / baud; 606 } 607 /* If the quotient is zero refuse the change */ 608 if (!quot && old_termios) { 609 /* FIXME: Will need updating for new tty in the end */ 610 tty->termios.c_cflag &= ~CBAUD; 611 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD); 612 baud = tty_get_baud_rate(tty); 613 if (!baud) 614 baud = 9600; 615 if (baud == 38400 && 616 (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 617 quot = info->custom_divisor; 618 else { 619 if (baud == 134) 620 /* Special case since 134 is really 134.5 */ 621 quot = (2*baud_base / 269); 622 else if (baud) 623 quot = baud_base / baud; 624 } 625 } 626 /* As a last resort, if the quotient is zero, default to 9600 bps */ 627 if (!quot) 628 quot = baud_base / 9600; 629 info->quot = quot; 630 info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base; 631 info->timeout += HZ/50; /* Add .02 seconds of slop */ 632 633 /* CTS flow control flag and modem status interrupts */ 634 info->IER &= ~UART_IER_MSI; 635 if (port->flags & ASYNC_HARDPPS_CD) 636 info->IER |= UART_IER_MSI; 637 tty_port_set_cts_flow(port, cflag & CRTSCTS); 638 if (cflag & CRTSCTS) 639 info->IER |= UART_IER_MSI; 640 tty_port_set_check_carrier(port, ~cflag & CLOCAL); 641 if (~cflag & CLOCAL) 642 info->IER |= UART_IER_MSI; 643 /* TBD: 644 * Does clearing IER_MSI imply that we should disable the VBL interrupt ? 645 */ 646 647 /* 648 * Set up parity check flag 649 */ 650 651 info->read_status_mask = UART_LSR_OE | UART_LSR_DR; 652 if (I_INPCK(tty)) 653 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; 654 if (I_BRKINT(tty) || I_PARMRK(tty)) 655 info->read_status_mask |= UART_LSR_BI; 656 657 /* 658 * Characters to ignore 659 */ 660 info->ignore_status_mask = 0; 661 if (I_IGNPAR(tty)) 662 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; 663 if (I_IGNBRK(tty)) { 664 info->ignore_status_mask |= UART_LSR_BI; 665 /* 666 * If we're ignore parity and break indicators, ignore 667 * overruns too. (For real raw support). 668 */ 669 if (I_IGNPAR(tty)) 670 info->ignore_status_mask |= UART_LSR_OE; 671 } 672 /* 673 * !!! ignore all characters if CREAD is not set 674 */ 675 if ((cflag & CREAD) == 0) 676 info->ignore_status_mask |= UART_LSR_DR; 677 local_irq_save(flags); 678 679 { 680 short serper; 681 682 /* Set up the baud rate */ 683 serper = quot - 1; 684 685 /* Enable or disable parity bit */ 686 687 if(cval & UART_LCR_PARITY) 688 serper |= (SERPER_PARENB); 689 690 amiga_custom.serper = serper; 691 mb(); 692 } 693 694 local_irq_restore(flags); 695 } 696 697 static int rs_put_char(struct tty_struct *tty, u8 ch) 698 { 699 struct serial_state *info; 700 unsigned long flags; 701 702 info = tty->driver_data; 703 704 if (!info->xmit.buf) 705 return 0; 706 707 local_irq_save(flags); 708 if (CIRC_SPACE(info->xmit.head, 709 info->xmit.tail, 710 UART_XMIT_SIZE) == 0) { 711 local_irq_restore(flags); 712 return 0; 713 } 714 715 info->xmit.buf[info->xmit.head++] = ch; 716 info->xmit.head &= UART_XMIT_SIZE - 1; 717 local_irq_restore(flags); 718 return 1; 719 } 720 721 static void rs_flush_chars(struct tty_struct *tty) 722 { 723 struct serial_state *info = tty->driver_data; 724 unsigned long flags; 725 726 if (info->xmit.head == info->xmit.tail 727 || tty->flow.stopped 728 || tty->hw_stopped 729 || !info->xmit.buf) 730 return; 731 732 local_irq_save(flags); 733 info->IER |= UART_IER_THRI; 734 amiga_custom.intena = IF_SETCLR | IF_TBE; 735 mb(); 736 /* set a pending Tx Interrupt, transmitter should restart now */ 737 amiga_custom.intreq = IF_SETCLR | IF_TBE; 738 mb(); 739 local_irq_restore(flags); 740 } 741 742 static ssize_t rs_write(struct tty_struct * tty, const u8 *buf, size_t count) 743 { 744 int c, ret = 0; 745 struct serial_state *info = tty->driver_data; 746 unsigned long flags; 747 748 if (!info->xmit.buf) 749 return 0; 750 751 local_irq_save(flags); 752 while (1) { 753 c = CIRC_SPACE_TO_END(info->xmit.head, 754 info->xmit.tail, 755 UART_XMIT_SIZE); 756 if (count < c) 757 c = count; 758 if (c <= 0) { 759 break; 760 } 761 memcpy(info->xmit.buf + info->xmit.head, buf, c); 762 info->xmit.head = (info->xmit.head + c) & (UART_XMIT_SIZE - 1); 763 buf += c; 764 count -= c; 765 ret += c; 766 } 767 local_irq_restore(flags); 768 769 if (info->xmit.head != info->xmit.tail 770 && !tty->flow.stopped 771 && !tty->hw_stopped 772 && !(info->IER & UART_IER_THRI)) { 773 info->IER |= UART_IER_THRI; 774 local_irq_disable(); 775 amiga_custom.intena = IF_SETCLR | IF_TBE; 776 mb(); 777 /* set a pending Tx Interrupt, transmitter should restart now */ 778 amiga_custom.intreq = IF_SETCLR | IF_TBE; 779 mb(); 780 local_irq_restore(flags); 781 } 782 return ret; 783 } 784 785 static unsigned int rs_write_room(struct tty_struct *tty) 786 { 787 struct serial_state *info = tty->driver_data; 788 789 return CIRC_SPACE(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE); 790 } 791 792 static unsigned int rs_chars_in_buffer(struct tty_struct *tty) 793 { 794 struct serial_state *info = tty->driver_data; 795 796 return CIRC_CNT(info->xmit.head, info->xmit.tail, UART_XMIT_SIZE); 797 } 798 799 static void rs_flush_buffer(struct tty_struct *tty) 800 { 801 struct serial_state *info = tty->driver_data; 802 unsigned long flags; 803 804 local_irq_save(flags); 805 info->xmit.head = info->xmit.tail = 0; 806 local_irq_restore(flags); 807 tty_wakeup(tty); 808 } 809 810 /* 811 * This function is used to send a high-priority XON/XOFF character to 812 * the device 813 */ 814 static void rs_send_xchar(struct tty_struct *tty, u8 ch) 815 { 816 struct serial_state *info = tty->driver_data; 817 unsigned long flags; 818 819 info->x_char = ch; 820 if (ch) { 821 /* Make sure transmit interrupts are on */ 822 823 /* Check this ! */ 824 local_irq_save(flags); 825 if(!(amiga_custom.intenar & IF_TBE)) { 826 amiga_custom.intena = IF_SETCLR | IF_TBE; 827 mb(); 828 /* set a pending Tx Interrupt, transmitter should restart now */ 829 amiga_custom.intreq = IF_SETCLR | IF_TBE; 830 mb(); 831 } 832 local_irq_restore(flags); 833 834 info->IER |= UART_IER_THRI; 835 } 836 } 837 838 /* 839 * ------------------------------------------------------------ 840 * rs_throttle() 841 * 842 * This routine is called by the upper-layer tty layer to signal that 843 * incoming characters should be throttled. 844 * ------------------------------------------------------------ 845 */ 846 static void rs_throttle(struct tty_struct * tty) 847 { 848 struct serial_state *info = tty->driver_data; 849 unsigned long flags; 850 #ifdef SERIAL_DEBUG_THROTTLE 851 printk("throttle %s ....\n", tty_name(tty)); 852 #endif 853 854 if (I_IXOFF(tty)) 855 rs_send_xchar(tty, STOP_CHAR(tty)); 856 857 if (C_CRTSCTS(tty)) 858 info->MCR &= ~SER_RTS; 859 860 local_irq_save(flags); 861 rtsdtr_ctrl(info->MCR); 862 local_irq_restore(flags); 863 } 864 865 static void rs_unthrottle(struct tty_struct * tty) 866 { 867 struct serial_state *info = tty->driver_data; 868 unsigned long flags; 869 #ifdef SERIAL_DEBUG_THROTTLE 870 printk("unthrottle %s ....\n", tty_name(tty)); 871 #endif 872 873 if (I_IXOFF(tty)) { 874 if (info->x_char) 875 info->x_char = 0; 876 else 877 rs_send_xchar(tty, START_CHAR(tty)); 878 } 879 if (C_CRTSCTS(tty)) 880 info->MCR |= SER_RTS; 881 local_irq_save(flags); 882 rtsdtr_ctrl(info->MCR); 883 local_irq_restore(flags); 884 } 885 886 /* 887 * ------------------------------------------------------------ 888 * rs_ioctl() and friends 889 * ------------------------------------------------------------ 890 */ 891 892 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss) 893 { 894 struct serial_state *state = tty->driver_data; 895 unsigned int close_delay, closing_wait; 896 897 tty_lock(tty); 898 close_delay = jiffies_to_msecs(state->tport.close_delay) / 10; 899 closing_wait = state->tport.closing_wait; 900 if (closing_wait != ASYNC_CLOSING_WAIT_NONE) 901 closing_wait = jiffies_to_msecs(closing_wait) / 10; 902 903 ss->line = tty->index; 904 ss->port = state->port; 905 ss->flags = state->tport.flags; 906 ss->xmit_fifo_size = XMIT_FIFO_SIZE; 907 ss->baud_base = state->baud_base; 908 ss->close_delay = close_delay; 909 ss->closing_wait = closing_wait; 910 ss->custom_divisor = state->custom_divisor; 911 tty_unlock(tty); 912 return 0; 913 } 914 915 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss) 916 { 917 struct serial_state *state = tty->driver_data; 918 struct tty_port *port = &state->tport; 919 bool change_spd; 920 int retval = 0; 921 unsigned int close_delay, closing_wait; 922 923 tty_lock(tty); 924 change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) || 925 ss->custom_divisor != state->custom_divisor; 926 if (ss->irq || ss->port != state->port || 927 ss->xmit_fifo_size != XMIT_FIFO_SIZE) { 928 tty_unlock(tty); 929 return -EINVAL; 930 } 931 932 close_delay = msecs_to_jiffies(ss->close_delay * 10); 933 closing_wait = ss->closing_wait; 934 if (closing_wait != ASYNC_CLOSING_WAIT_NONE) 935 closing_wait = msecs_to_jiffies(closing_wait * 10); 936 937 if (!capable(CAP_SYS_ADMIN)) { 938 if ((ss->baud_base != state->baud_base) || 939 (close_delay != port->close_delay) || 940 (closing_wait != port->closing_wait) || 941 ((ss->flags & ~ASYNC_USR_MASK) != 942 (port->flags & ~ASYNC_USR_MASK))) { 943 tty_unlock(tty); 944 return -EPERM; 945 } 946 port->flags = ((port->flags & ~ASYNC_USR_MASK) | 947 (ss->flags & ASYNC_USR_MASK)); 948 state->custom_divisor = ss->custom_divisor; 949 goto check_and_exit; 950 } 951 952 if (ss->baud_base < 9600) { 953 tty_unlock(tty); 954 return -EINVAL; 955 } 956 957 /* 958 * OK, past this point, all the error checking has been done. 959 * At this point, we start making changes..... 960 */ 961 962 state->baud_base = ss->baud_base; 963 port->flags = ((port->flags & ~ASYNC_FLAGS) | 964 (ss->flags & ASYNC_FLAGS)); 965 state->custom_divisor = ss->custom_divisor; 966 port->close_delay = close_delay; 967 port->closing_wait = closing_wait; 968 969 check_and_exit: 970 if (tty_port_initialized(port)) { 971 if (change_spd) { 972 /* warn about deprecation unless clearing */ 973 if (ss->flags & ASYNC_SPD_MASK) 974 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n"); 975 change_speed(tty, state, NULL); 976 } 977 } else 978 retval = rs_startup(tty, state); 979 tty_unlock(tty); 980 return retval; 981 } 982 983 /* 984 * get_lsr_info - get line status register info 985 * 986 * Purpose: Let user call ioctl() to get info when the UART physically 987 * is emptied. On bus types like RS485, the transmitter must 988 * release the bus after transmitting. This must be done when 989 * the transmit shift register is empty, not be done when the 990 * transmit holding register is empty. This functionality 991 * allows an RS485 driver to be written in user space. 992 */ 993 static int get_lsr_info(struct serial_state *info, unsigned int __user *value) 994 { 995 unsigned char status; 996 unsigned int result; 997 unsigned long flags; 998 999 local_irq_save(flags); 1000 status = amiga_custom.serdatr; 1001 mb(); 1002 local_irq_restore(flags); 1003 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0); 1004 if (copy_to_user(value, &result, sizeof(int))) 1005 return -EFAULT; 1006 return 0; 1007 } 1008 1009 1010 static int rs_tiocmget(struct tty_struct *tty) 1011 { 1012 struct serial_state *info = tty->driver_data; 1013 unsigned char control, status; 1014 unsigned long flags; 1015 1016 if (tty_io_error(tty)) 1017 return -EIO; 1018 1019 control = info->MCR; 1020 local_irq_save(flags); 1021 status = ciab.pra; 1022 local_irq_restore(flags); 1023 return ((control & SER_RTS) ? TIOCM_RTS : 0) 1024 | ((control & SER_DTR) ? TIOCM_DTR : 0) 1025 | (!(status & SER_DCD) ? TIOCM_CAR : 0) 1026 | (!(status & SER_DSR) ? TIOCM_DSR : 0) 1027 | (!(status & SER_CTS) ? TIOCM_CTS : 0); 1028 } 1029 1030 static int rs_tiocmset(struct tty_struct *tty, unsigned int set, 1031 unsigned int clear) 1032 { 1033 struct serial_state *info = tty->driver_data; 1034 unsigned long flags; 1035 1036 if (tty_io_error(tty)) 1037 return -EIO; 1038 1039 local_irq_save(flags); 1040 if (set & TIOCM_RTS) 1041 info->MCR |= SER_RTS; 1042 if (set & TIOCM_DTR) 1043 info->MCR |= SER_DTR; 1044 if (clear & TIOCM_RTS) 1045 info->MCR &= ~SER_RTS; 1046 if (clear & TIOCM_DTR) 1047 info->MCR &= ~SER_DTR; 1048 rtsdtr_ctrl(info->MCR); 1049 local_irq_restore(flags); 1050 return 0; 1051 } 1052 1053 /* 1054 * rs_break() --- routine which turns the break handling on or off 1055 */ 1056 static int rs_break(struct tty_struct *tty, int break_state) 1057 { 1058 unsigned long flags; 1059 1060 local_irq_save(flags); 1061 if (break_state == -1) 1062 amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK; 1063 else 1064 amiga_custom.adkcon = AC_UARTBRK; 1065 mb(); 1066 local_irq_restore(flags); 1067 return 0; 1068 } 1069 1070 /* 1071 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1072 * Return: write counters to the user passed counter struct 1073 * NB: both 1->0 and 0->1 transitions are counted except for 1074 * RI where only 0->1 is counted. 1075 */ 1076 static int rs_get_icount(struct tty_struct *tty, 1077 struct serial_icounter_struct *icount) 1078 { 1079 struct serial_state *info = tty->driver_data; 1080 struct async_icount cnow; 1081 unsigned long flags; 1082 1083 local_irq_save(flags); 1084 cnow = info->icount; 1085 local_irq_restore(flags); 1086 icount->cts = cnow.cts; 1087 icount->dsr = cnow.dsr; 1088 icount->rng = cnow.rng; 1089 icount->dcd = cnow.dcd; 1090 icount->rx = cnow.rx; 1091 icount->tx = cnow.tx; 1092 icount->frame = cnow.frame; 1093 icount->overrun = cnow.overrun; 1094 icount->parity = cnow.parity; 1095 icount->brk = cnow.brk; 1096 icount->buf_overrun = cnow.buf_overrun; 1097 1098 return 0; 1099 } 1100 1101 static int rs_ioctl(struct tty_struct *tty, 1102 unsigned int cmd, unsigned long arg) 1103 { 1104 struct serial_state *info = tty->driver_data; 1105 struct async_icount cprev, cnow; /* kernel counter temps */ 1106 void __user *argp = (void __user *)arg; 1107 unsigned long flags; 1108 DEFINE_WAIT(wait); 1109 int ret; 1110 1111 if ((cmd != TIOCSERCONFIG) && 1112 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) { 1113 if (tty_io_error(tty)) 1114 return -EIO; 1115 } 1116 1117 switch (cmd) { 1118 case TIOCSERCONFIG: 1119 return 0; 1120 1121 case TIOCSERGETLSR: /* Get line status register */ 1122 return get_lsr_info(info, argp); 1123 1124 /* 1125 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1126 * - mask passed in arg for lines of interest 1127 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1128 * Caller should use TIOCGICOUNT to see which one it was 1129 */ 1130 case TIOCMIWAIT: 1131 local_irq_save(flags); 1132 /* note the counters on entry */ 1133 cprev = info->icount; 1134 local_irq_restore(flags); 1135 while (1) { 1136 prepare_to_wait(&info->tport.delta_msr_wait, 1137 &wait, TASK_INTERRUPTIBLE); 1138 local_irq_save(flags); 1139 cnow = info->icount; /* atomic copy */ 1140 local_irq_restore(flags); 1141 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1142 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1143 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1144 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) { 1145 ret = 0; 1146 break; 1147 } 1148 if (tty_io_error(tty)) { 1149 ret = -EIO; 1150 break; 1151 } 1152 schedule(); 1153 /* see if a signal did it */ 1154 if (signal_pending(current)) { 1155 ret = -ERESTARTSYS; 1156 break; 1157 } 1158 cprev = cnow; 1159 } 1160 finish_wait(&info->tport.delta_msr_wait, &wait); 1161 return ret; 1162 1163 default: 1164 return -ENOIOCTLCMD; 1165 } 1166 return 0; 1167 } 1168 1169 static void rs_set_termios(struct tty_struct *tty, const struct ktermios *old_termios) 1170 { 1171 struct serial_state *info = tty->driver_data; 1172 unsigned long flags; 1173 unsigned int cflag = tty->termios.c_cflag; 1174 1175 change_speed(tty, info, old_termios); 1176 1177 /* Handle transition to B0 status */ 1178 if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) { 1179 info->MCR &= ~(SER_DTR|SER_RTS); 1180 local_irq_save(flags); 1181 rtsdtr_ctrl(info->MCR); 1182 local_irq_restore(flags); 1183 } 1184 1185 /* Handle transition away from B0 status */ 1186 if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1187 info->MCR |= SER_DTR; 1188 if (!C_CRTSCTS(tty) || !tty_throttled(tty)) 1189 info->MCR |= SER_RTS; 1190 local_irq_save(flags); 1191 rtsdtr_ctrl(info->MCR); 1192 local_irq_restore(flags); 1193 } 1194 1195 /* Handle turning off CRTSCTS */ 1196 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) { 1197 tty->hw_stopped = false; 1198 rs_start(tty); 1199 } 1200 1201 #if 0 1202 /* 1203 * No need to wake up processes in open wait, since they 1204 * sample the CLOCAL flag once, and don't recheck it. 1205 * XXX It's not clear whether the current behavior is correct 1206 * or not. Hence, this may change..... 1207 */ 1208 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty)) 1209 wake_up_interruptible(&info->open_wait); 1210 #endif 1211 } 1212 1213 /* 1214 * ------------------------------------------------------------ 1215 * rs_close() 1216 * 1217 * This routine is called when the serial port gets closed. First, we 1218 * wait for the last remaining data to be sent. Then, we unlink its 1219 * async structure from the interrupt chain if necessary, and we free 1220 * that IRQ if nothing is left in the chain. 1221 * ------------------------------------------------------------ 1222 */ 1223 static void rs_close(struct tty_struct *tty, struct file * filp) 1224 { 1225 struct serial_state *state = tty->driver_data; 1226 struct tty_port *port = &state->tport; 1227 1228 if (tty_port_close_start(port, tty, filp) == 0) 1229 return; 1230 1231 /* 1232 * At this point we stop accepting input. To do this, we 1233 * disable the receive line status interrupts, and tell the 1234 * interrupt driver to stop checking the data ready bit in the 1235 * line status register. 1236 */ 1237 state->read_status_mask &= ~UART_LSR_DR; 1238 if (tty_port_initialized(port)) { 1239 /* disable receive interrupts */ 1240 amiga_custom.intena = IF_RBF; 1241 mb(); 1242 /* clear any pending receive interrupt */ 1243 amiga_custom.intreq = IF_RBF; 1244 mb(); 1245 1246 /* 1247 * Before we drop DTR, make sure the UART transmitter 1248 * has completely drained; this is especially 1249 * important if there is a transmit FIFO! 1250 */ 1251 rs_wait_until_sent(tty, state->timeout); 1252 } 1253 rs_shutdown(tty, state); 1254 rs_flush_buffer(tty); 1255 1256 tty_ldisc_flush(tty); 1257 port->tty = NULL; 1258 1259 tty_port_close_end(port, tty); 1260 } 1261 1262 /* 1263 * rs_wait_until_sent() --- wait until the transmitter is empty 1264 */ 1265 static void rs_wait_until_sent(struct tty_struct *tty, int timeout) 1266 { 1267 struct serial_state *info = tty->driver_data; 1268 unsigned long orig_jiffies, char_time; 1269 int lsr; 1270 1271 orig_jiffies = jiffies; 1272 1273 /* 1274 * Set the check interval to be 1/5 of the estimated time to 1275 * send a single character, and make it at least 1. The check 1276 * interval should also be less than the timeout. 1277 * 1278 * Note: we have to use pretty tight timings here to satisfy 1279 * the NIST-PCTS. 1280 */ 1281 char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE; 1282 char_time = char_time / 5; 1283 if (char_time == 0) 1284 char_time = 1; 1285 if (timeout) 1286 char_time = min_t(unsigned long, char_time, timeout); 1287 /* 1288 * If the transmitter hasn't cleared in twice the approximate 1289 * amount of time to send the entire FIFO, it probably won't 1290 * ever clear. This assumes the UART isn't doing flow 1291 * control, which is currently the case. Hence, if it ever 1292 * takes longer than info->timeout, this is probably due to a 1293 * UART bug of some kind. So, we clamp the timeout parameter at 1294 * 2*info->timeout. 1295 */ 1296 if (!timeout || timeout > 2*info->timeout) 1297 timeout = 2*info->timeout; 1298 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1299 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time); 1300 printk("jiff=%lu...", jiffies); 1301 #endif 1302 while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) { 1303 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1304 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies); 1305 #endif 1306 msleep_interruptible(jiffies_to_msecs(char_time)); 1307 if (signal_pending(current)) 1308 break; 1309 if (timeout && time_after(jiffies, orig_jiffies + timeout)) 1310 break; 1311 } 1312 __set_current_state(TASK_RUNNING); 1313 1314 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT 1315 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); 1316 #endif 1317 } 1318 1319 /* 1320 * rs_hangup() --- called by tty_hangup() when a hangup is signaled. 1321 */ 1322 static void rs_hangup(struct tty_struct *tty) 1323 { 1324 struct serial_state *info = tty->driver_data; 1325 1326 rs_flush_buffer(tty); 1327 rs_shutdown(tty, info); 1328 info->tport.count = 0; 1329 tty_port_set_active(&info->tport, false); 1330 info->tport.tty = NULL; 1331 wake_up_interruptible(&info->tport.open_wait); 1332 } 1333 1334 /* 1335 * This routine is called whenever a serial port is opened. It 1336 * enables interrupts for a serial port, linking in its async structure into 1337 * the IRQ chain. It also performs the serial-specific 1338 * initialization for the tty structure. 1339 */ 1340 static int rs_open(struct tty_struct *tty, struct file * filp) 1341 { 1342 struct tty_port *port = tty->port; 1343 struct serial_state *info = container_of(port, struct serial_state, 1344 tport); 1345 int retval; 1346 1347 port->count++; 1348 port->tty = tty; 1349 tty->driver_data = info; 1350 1351 retval = rs_startup(tty, info); 1352 if (retval) { 1353 return retval; 1354 } 1355 1356 return tty_port_block_til_ready(port, tty, filp); 1357 } 1358 1359 /* 1360 * /proc fs routines.... 1361 */ 1362 1363 static inline void line_info(struct seq_file *m, int line, 1364 struct serial_state *state) 1365 { 1366 char stat_buf[30], control, status; 1367 unsigned long flags; 1368 1369 seq_printf(m, "%d: uart:amiga_builtin", line); 1370 1371 local_irq_save(flags); 1372 status = ciab.pra; 1373 control = tty_port_initialized(&state->tport) ? state->MCR : status; 1374 local_irq_restore(flags); 1375 1376 stat_buf[0] = 0; 1377 stat_buf[1] = 0; 1378 if(!(control & SER_RTS)) 1379 strcat(stat_buf, "|RTS"); 1380 if(!(status & SER_CTS)) 1381 strcat(stat_buf, "|CTS"); 1382 if(!(control & SER_DTR)) 1383 strcat(stat_buf, "|DTR"); 1384 if(!(status & SER_DSR)) 1385 strcat(stat_buf, "|DSR"); 1386 if(!(status & SER_DCD)) 1387 strcat(stat_buf, "|CD"); 1388 1389 if (state->quot) 1390 seq_printf(m, " baud:%d", state->baud_base / state->quot); 1391 1392 seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx); 1393 1394 if (state->icount.frame) 1395 seq_printf(m, " fe:%d", state->icount.frame); 1396 1397 if (state->icount.parity) 1398 seq_printf(m, " pe:%d", state->icount.parity); 1399 1400 if (state->icount.brk) 1401 seq_printf(m, " brk:%d", state->icount.brk); 1402 1403 if (state->icount.overrun) 1404 seq_printf(m, " oe:%d", state->icount.overrun); 1405 1406 /* 1407 * Last thing is the RS-232 status lines 1408 */ 1409 seq_printf(m, " %s\n", stat_buf+1); 1410 } 1411 1412 static int rs_proc_show(struct seq_file *m, void *v) 1413 { 1414 seq_printf(m, "serinfo:1.0 driver:4.30\n"); 1415 line_info(m, 0, &serial_state); 1416 return 0; 1417 } 1418 1419 /* 1420 * --------------------------------------------------------------------- 1421 * rs_init() and friends 1422 * 1423 * rs_init() is called at boot-time to initialize the serial driver. 1424 * --------------------------------------------------------------------- 1425 */ 1426 1427 static const struct tty_operations serial_ops = { 1428 .open = rs_open, 1429 .close = rs_close, 1430 .write = rs_write, 1431 .put_char = rs_put_char, 1432 .flush_chars = rs_flush_chars, 1433 .write_room = rs_write_room, 1434 .chars_in_buffer = rs_chars_in_buffer, 1435 .flush_buffer = rs_flush_buffer, 1436 .ioctl = rs_ioctl, 1437 .throttle = rs_throttle, 1438 .unthrottle = rs_unthrottle, 1439 .set_termios = rs_set_termios, 1440 .stop = rs_stop, 1441 .start = rs_start, 1442 .hangup = rs_hangup, 1443 .break_ctl = rs_break, 1444 .send_xchar = rs_send_xchar, 1445 .wait_until_sent = rs_wait_until_sent, 1446 .tiocmget = rs_tiocmget, 1447 .tiocmset = rs_tiocmset, 1448 .get_icount = rs_get_icount, 1449 .set_serial = set_serial_info, 1450 .get_serial = get_serial_info, 1451 .proc_show = rs_proc_show, 1452 }; 1453 1454 static bool amiga_carrier_raised(struct tty_port *port) 1455 { 1456 return !(ciab.pra & SER_DCD); 1457 } 1458 1459 static void amiga_dtr_rts(struct tty_port *port, bool active) 1460 { 1461 struct serial_state *info = container_of(port, struct serial_state, 1462 tport); 1463 unsigned long flags; 1464 1465 if (active) 1466 info->MCR |= SER_DTR|SER_RTS; 1467 else 1468 info->MCR &= ~(SER_DTR|SER_RTS); 1469 1470 local_irq_save(flags); 1471 rtsdtr_ctrl(info->MCR); 1472 local_irq_restore(flags); 1473 } 1474 1475 static const struct tty_port_operations amiga_port_ops = { 1476 .carrier_raised = amiga_carrier_raised, 1477 .dtr_rts = amiga_dtr_rts, 1478 }; 1479 1480 /* 1481 * The serial driver boot-time initialization code! 1482 */ 1483 static int __init amiga_serial_probe(struct platform_device *pdev) 1484 { 1485 struct serial_state *state = &serial_state; 1486 struct tty_driver *driver; 1487 unsigned long flags; 1488 int error; 1489 1490 driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW); 1491 if (IS_ERR(driver)) 1492 return PTR_ERR(driver); 1493 1494 /* Initialize the tty_driver structure */ 1495 1496 driver->driver_name = "amiserial"; 1497 driver->name = "ttyS"; 1498 driver->major = TTY_MAJOR; 1499 driver->minor_start = 64; 1500 driver->type = TTY_DRIVER_TYPE_SERIAL; 1501 driver->subtype = SERIAL_TYPE_NORMAL; 1502 driver->init_termios = tty_std_termios; 1503 driver->init_termios.c_cflag = 1504 B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1505 tty_set_operations(driver, &serial_ops); 1506 1507 memset(state, 0, sizeof(*state)); 1508 state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */ 1509 tty_port_init(&state->tport); 1510 state->tport.ops = &amiga_port_ops; 1511 tty_port_link_device(&state->tport, driver, 0); 1512 1513 error = tty_register_driver(driver); 1514 if (error) 1515 goto fail_tty_driver_kref_put; 1516 1517 printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n"); 1518 1519 /* Hardware set up */ 1520 1521 state->baud_base = amiga_colorclock; 1522 1523 /* set ISRs, and then disable the rx interrupts */ 1524 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state); 1525 if (error) 1526 goto fail_unregister; 1527 1528 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0, 1529 "serial RX", state); 1530 if (error) 1531 goto fail_free_irq; 1532 1533 local_irq_save(flags); 1534 1535 /* turn off Rx and Tx interrupts */ 1536 amiga_custom.intena = IF_RBF | IF_TBE; 1537 mb(); 1538 1539 /* clear any pending interrupt */ 1540 amiga_custom.intreq = IF_RBF | IF_TBE; 1541 mb(); 1542 1543 local_irq_restore(flags); 1544 1545 /* 1546 * set the appropriate directions for the modem control flags, 1547 * and clear RTS and DTR 1548 */ 1549 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */ 1550 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */ 1551 1552 platform_set_drvdata(pdev, state); 1553 1554 serial_driver = driver; 1555 1556 return 0; 1557 1558 fail_free_irq: 1559 free_irq(IRQ_AMIGA_TBE, state); 1560 fail_unregister: 1561 tty_unregister_driver(driver); 1562 fail_tty_driver_kref_put: 1563 tty_port_destroy(&state->tport); 1564 tty_driver_kref_put(driver); 1565 return error; 1566 } 1567 1568 static void __exit amiga_serial_remove(struct platform_device *pdev) 1569 { 1570 struct serial_state *state = platform_get_drvdata(pdev); 1571 1572 tty_unregister_driver(serial_driver); 1573 tty_driver_kref_put(serial_driver); 1574 tty_port_destroy(&state->tport); 1575 1576 free_irq(IRQ_AMIGA_TBE, state); 1577 free_irq(IRQ_AMIGA_RBF, state); 1578 } 1579 1580 /* 1581 * amiga_serial_remove() lives in .exit.text. For drivers registered via 1582 * module_platform_driver_probe() this is ok because they cannot get unbound at 1583 * runtime. So mark the driver struct with __refdata to prevent modpost 1584 * triggering a section mismatch warning. 1585 */ 1586 static struct platform_driver amiga_serial_driver __refdata = { 1587 .remove = __exit_p(amiga_serial_remove), 1588 .driver = { 1589 .name = "amiga-serial", 1590 }, 1591 }; 1592 1593 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe); 1594 1595 1596 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE) 1597 1598 /* 1599 * ------------------------------------------------------------ 1600 * Serial console driver 1601 * ------------------------------------------------------------ 1602 */ 1603 1604 static void amiga_serial_putc(char c) 1605 { 1606 amiga_custom.serdat = (unsigned char)c | 0x100; 1607 while (!(amiga_custom.serdatr & 0x2000)) 1608 barrier(); 1609 } 1610 1611 /* 1612 * Print a string to the serial port trying not to disturb 1613 * any possible real use of the port... 1614 * 1615 * The console must be locked when we get here. 1616 */ 1617 static void serial_console_write(struct console *co, const char *s, 1618 unsigned count) 1619 { 1620 unsigned short intena = amiga_custom.intenar; 1621 1622 amiga_custom.intena = IF_TBE; 1623 1624 while (count--) { 1625 if (*s == '\n') 1626 amiga_serial_putc('\r'); 1627 amiga_serial_putc(*s++); 1628 } 1629 1630 amiga_custom.intena = IF_SETCLR | (intena & IF_TBE); 1631 } 1632 1633 static struct tty_driver *serial_console_device(struct console *c, int *index) 1634 { 1635 *index = 0; 1636 return serial_driver; 1637 } 1638 1639 static struct console sercons = { 1640 .name = "ttyS", 1641 .write = serial_console_write, 1642 .device = serial_console_device, 1643 .flags = CON_PRINTBUFFER, 1644 .index = -1, 1645 }; 1646 1647 /* 1648 * Register console. 1649 */ 1650 static int __init amiserial_console_init(void) 1651 { 1652 if (!MACH_IS_AMIGA) 1653 return -ENODEV; 1654 1655 register_console(&sercons); 1656 return 0; 1657 } 1658 console_initcall(amiserial_console_init); 1659 1660 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */ 1661 1662 MODULE_DESCRIPTION("Serial driver for the amiga builtin port"); 1663 MODULE_LICENSE("GPL"); 1664 MODULE_ALIAS("platform:amiga-serial"); 1665