drivers/tty/amiserial.c

   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");