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/drivers/tty/serial/68328serial.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 1448 lines | 1035 code | 224 blank | 189 comment | 182 complexity | 53dd157c511b979e6408f1f30ac236b0 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
   1/* 68328serial.c: Serial port driver for 68328 microcontroller
   2 *
   3 * Copyright (C) 1995       David S. Miller    <davem@caip.rutgers.edu>
   4 * Copyright (C) 1998       Kenneth Albanowski <kjahds@kjahds.com>
   5 * Copyright (C) 1998, 1999 D. Jeff Dionne     <jeff@uclinux.org>
   6 * Copyright (C) 1999       Vladimir Gurevich  <vgurevic@cisco.com>
   7 * Copyright (C) 2002-2003  David McCullough   <davidm@snapgear.com>
   8 * Copyright (C) 2002       Greg Ungerer       <gerg@snapgear.com>
   9 *
  10 * VZ Support/Fixes             Evan Stawnyczy <e@lineo.ca>
  11 * Multiple UART support        Daniel Potts <danielp@cse.unsw.edu.au>
  12 * Power management support     Daniel Potts <danielp@cse.unsw.edu.au>
  13 * VZ Second Serial Port enable Phil Wilshire
  14 * 2.4/2.5 port                 David McCullough
  15 */
  16
  17#include <asm/dbg.h>
  18#include <linux/module.h>
  19#include <linux/errno.h>
  20#include <linux/signal.h>
  21#include <linux/sched.h>
  22#include <linux/timer.h>
  23#include <linux/interrupt.h>
  24#include <linux/tty.h>
  25#include <linux/tty_flip.h>
  26#include <linux/major.h>
  27#include <linux/string.h>
  28#include <linux/fcntl.h>
  29#include <linux/mm.h>
  30#include <linux/kernel.h>
  31#include <linux/console.h>
  32#include <linux/reboot.h>
  33#include <linux/keyboard.h>
  34#include <linux/init.h>
  35#include <linux/pm.h>
  36#include <linux/bitops.h>
  37#include <linux/delay.h>
  38#include <linux/gfp.h>
  39
  40#include <asm/io.h>
  41#include <asm/irq.h>
  42#include <asm/system.h>
  43#include <asm/delay.h>
  44#include <asm/uaccess.h>
  45
  46/* (es) */
  47/* note: perhaps we can murge these files, so that you can just
  48 * 	 define 1 of them, and they can sort that out for themselves
  49 */
  50#if defined(CONFIG_M68EZ328)
  51#include <asm/MC68EZ328.h>
  52#else
  53#if defined(CONFIG_M68VZ328)
  54#include <asm/MC68VZ328.h>
  55#else
  56#include <asm/MC68328.h>
  57#endif /* CONFIG_M68VZ328 */
  58#endif /* CONFIG_M68EZ328 */
  59
  60#include "68328serial.h"
  61
  62/* Turn off usage of real serial interrupt code, to "support" Copilot */
  63#ifdef CONFIG_XCOPILOT_BUGS
  64#undef USE_INTS
  65#else
  66#define USE_INTS
  67#endif
  68
  69static struct m68k_serial m68k_soft[NR_PORTS];
  70
  71static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
  72
  73/* multiple ports are contiguous in memory */
  74m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
  75
  76struct tty_struct m68k_ttys;
  77struct m68k_serial *m68k_consinfo = 0;
  78
  79#define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
  80
  81struct tty_driver *serial_driver;
  82
  83/* number of characters left in xmit buffer before we ask for more */
  84#define WAKEUP_CHARS 256
  85
  86/* Debugging... DEBUG_INTR is bad to use when one of the zs
  87 * lines is your console ;(
  88 */
  89#undef SERIAL_DEBUG_INTR
  90#undef SERIAL_DEBUG_OPEN
  91#undef SERIAL_DEBUG_FLOW
  92
  93#define RS_ISR_PASS_LIMIT 256
  94
  95static void change_speed(struct m68k_serial *info);
  96
  97/*
  98 *	Setup for console. Argument comes from the boot command line.
  99 */
 100
 101/* note: this is messy, but it works, again, perhaps defined somewhere else?*/
 102#ifdef CONFIG_M68VZ328
 103#define CONSOLE_BAUD_RATE	19200
 104#define DEFAULT_CBAUD		B19200
 105#endif
 106
 107
 108#ifndef CONSOLE_BAUD_RATE
 109#define	CONSOLE_BAUD_RATE	9600
 110#define	DEFAULT_CBAUD		B9600
 111#endif
 112
 113
 114static int m68328_console_initted = 0;
 115static int m68328_console_baud    = CONSOLE_BAUD_RATE;
 116static int m68328_console_cbaud   = DEFAULT_CBAUD;
 117
 118
 119static inline int serial_paranoia_check(struct m68k_serial *info,
 120					char *name, const char *routine)
 121{
 122#ifdef SERIAL_PARANOIA_CHECK
 123	static const char *badmagic =
 124		"Warning: bad magic number for serial struct %s in %s\n";
 125	static const char *badinfo =
 126		"Warning: null m68k_serial for %s in %s\n";
 127
 128	if (!info) {
 129		printk(badinfo, name, routine);
 130		return 1;
 131	}
 132	if (info->magic != SERIAL_MAGIC) {
 133		printk(badmagic, name, routine);
 134		return 1;
 135	}
 136#endif
 137	return 0;
 138}
 139
 140/*
 141 * This is used to figure out the divisor speeds and the timeouts
 142 */
 143static int baud_table[] = {
 144	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
 145	9600, 19200, 38400, 57600, 115200, 0 };
 146
 147/* Sets or clears DTR/RTS on the requested line */
 148static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
 149{
 150	if (set) {
 151		/* set the RTS/CTS line */
 152	} else {
 153		/* clear it */
 154	}
 155	return;
 156}
 157
 158/* Utility routines */
 159static inline int get_baud(struct m68k_serial *ss)
 160{
 161	unsigned long result = 115200;
 162	unsigned short int baud = uart_addr[ss->line].ubaud;
 163	if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
 164	result >>= GET_FIELD(baud, UBAUD_DIVIDE);
 165
 166	return result;
 167}
 168
 169/*
 170 * ------------------------------------------------------------
 171 * rs_stop() and rs_start()
 172 *
 173 * This routines are called before setting or resetting tty->stopped.
 174 * They enable or disable transmitter interrupts, as necessary.
 175 * ------------------------------------------------------------
 176 */
 177static void rs_stop(struct tty_struct *tty)
 178{
 179	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 180	m68328_uart *uart = &uart_addr[info->line];
 181	unsigned long flags;
 182
 183	if (serial_paranoia_check(info, tty->name, "rs_stop"))
 184		return;
 185	
 186	local_irq_save(flags);
 187	uart->ustcnt &= ~USTCNT_TXEN;
 188	local_irq_restore(flags);
 189}
 190
 191static int rs_put_char(char ch)
 192{
 193        int flags, loops = 0;
 194
 195        local_irq_save(flags);
 196
 197	while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
 198        	loops++;
 199        	udelay(5);
 200        }
 201
 202	UTX_TXDATA = ch;
 203        udelay(5);
 204        local_irq_restore(flags);
 205        return 1;
 206}
 207
 208static void rs_start(struct tty_struct *tty)
 209{
 210	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 211	m68328_uart *uart = &uart_addr[info->line];
 212	unsigned long flags;
 213	
 214	if (serial_paranoia_check(info, tty->name, "rs_start"))
 215		return;
 216	
 217	local_irq_save(flags);
 218	if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
 219#ifdef USE_INTS
 220		uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 221#else
 222		uart->ustcnt |= USTCNT_TXEN;
 223#endif
 224	}
 225	local_irq_restore(flags);
 226}
 227
 228/* Drop into either the boot monitor or kadb upon receiving a break
 229 * from keyboard/console input.
 230 */
 231static void batten_down_hatches(void)
 232{
 233	/* Drop into the debugger */
 234}
 235
 236static void status_handle(struct m68k_serial *info, unsigned short status)
 237{
 238#if 0
 239	if(status & DCD) {
 240		if((info->port.tty->termios->c_cflag & CRTSCTS) &&
 241		   ((info->curregs[3] & AUTO_ENAB)==0)) {
 242			info->curregs[3] |= AUTO_ENAB;
 243			info->pendregs[3] |= AUTO_ENAB;
 244			write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 245		}
 246	} else {
 247		if((info->curregs[3] & AUTO_ENAB)) {
 248			info->curregs[3] &= ~AUTO_ENAB;
 249			info->pendregs[3] &= ~AUTO_ENAB;
 250			write_zsreg(info->m68k_channel, 3, info->curregs[3]);
 251		}
 252	}
 253#endif
 254	/* If this is console input and this is a
 255	 * 'break asserted' status change interrupt
 256	 * see if we can drop into the debugger
 257	 */
 258	if((status & URX_BREAK) && info->break_abort)
 259		batten_down_hatches();
 260	return;
 261}
 262
 263static void receive_chars(struct m68k_serial *info, unsigned short rx)
 264{
 265	struct tty_struct *tty = info->tty;
 266	m68328_uart *uart = &uart_addr[info->line];
 267	unsigned char ch, flag;
 268
 269	/*
 270	 * This do { } while() loop will get ALL chars out of Rx FIFO 
 271         */
 272#ifndef CONFIG_XCOPILOT_BUGS
 273	do {
 274#endif	
 275		ch = GET_FIELD(rx, URX_RXDATA);
 276	
 277		if(info->is_cons) {
 278			if(URX_BREAK & rx) { /* whee, break received */
 279				status_handle(info, rx);
 280				return;
 281#ifdef CONFIG_MAGIC_SYSRQ
 282			} else if (ch == 0x10) { /* ^P */
 283				show_state();
 284				show_free_areas(0);
 285				show_buffers();
 286/*				show_net_buffers(); */
 287				return;
 288			} else if (ch == 0x12) { /* ^R */
 289				emergency_restart();
 290				return;
 291#endif /* CONFIG_MAGIC_SYSRQ */
 292			}
 293		}
 294
 295		if(!tty)
 296			goto clear_and_exit;
 297		
 298		flag = TTY_NORMAL;
 299
 300		if(rx & URX_PARITY_ERROR) {
 301			flag = TTY_PARITY;
 302			status_handle(info, rx);
 303		} else if(rx & URX_OVRUN) {
 304			flag = TTY_OVERRUN;
 305			status_handle(info, rx);
 306		} else if(rx & URX_FRAME_ERROR) {
 307			flag = TTY_FRAME;
 308			status_handle(info, rx);
 309		}
 310		tty_insert_flip_char(tty, ch, flag);
 311#ifndef CONFIG_XCOPILOT_BUGS
 312	} while((rx = uart->urx.w) & URX_DATA_READY);
 313#endif
 314
 315	tty_schedule_flip(tty);
 316
 317clear_and_exit:
 318	return;
 319}
 320
 321static void transmit_chars(struct m68k_serial *info)
 322{
 323	m68328_uart *uart = &uart_addr[info->line];
 324
 325	if (info->x_char) {
 326		/* Send next char */
 327		uart->utx.b.txdata = info->x_char;
 328		info->x_char = 0;
 329		goto clear_and_return;
 330	}
 331
 332	if((info->xmit_cnt <= 0) || info->tty->stopped) {
 333		/* That's peculiar... TX ints off */
 334		uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 335		goto clear_and_return;
 336	}
 337
 338	/* Send char */
 339	uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 340	info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 341	info->xmit_cnt--;
 342
 343	if (info->xmit_cnt < WAKEUP_CHARS)
 344		schedule_work(&info->tqueue);
 345
 346	if(info->xmit_cnt <= 0) {
 347		/* All done for now... TX ints off */
 348		uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
 349		goto clear_and_return;
 350	}
 351
 352clear_and_return:
 353	/* Clear interrupt (should be auto)*/
 354	return;
 355}
 356
 357/*
 358 * This is the serial driver's generic interrupt routine
 359 */
 360irqreturn_t rs_interrupt(int irq, void *dev_id)
 361{
 362	struct m68k_serial *info = dev_id;
 363	m68328_uart *uart;
 364	unsigned short rx;
 365	unsigned short tx;
 366
 367	uart = &uart_addr[info->line];
 368	rx = uart->urx.w;
 369
 370#ifdef USE_INTS
 371	tx = uart->utx.w;
 372
 373	if (rx & URX_DATA_READY) receive_chars(info, rx);
 374	if (tx & UTX_TX_AVAIL)   transmit_chars(info);
 375#else
 376	receive_chars(info, rx);		
 377#endif
 378	return IRQ_HANDLED;
 379}
 380
 381static void do_softint(struct work_struct *work)
 382{
 383	struct m68k_serial	*info = container_of(work, struct m68k_serial, tqueue);
 384	struct tty_struct	*tty;
 385	
 386	tty = info->tty;
 387	if (!tty)
 388		return;
 389#if 0
 390	if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
 391		tty_wakeup(tty);
 392	}
 393#endif   
 394}
 395
 396static int startup(struct m68k_serial * info)
 397{
 398	m68328_uart *uart = &uart_addr[info->line];
 399	unsigned long flags;
 400	
 401	if (info->flags & S_INITIALIZED)
 402		return 0;
 403
 404	if (!info->xmit_buf) {
 405		info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
 406		if (!info->xmit_buf)
 407			return -ENOMEM;
 408	}
 409
 410	local_irq_save(flags);
 411
 412	/*
 413	 * Clear the FIFO buffers and disable them
 414	 * (they will be reenabled in change_speed())
 415	 */
 416
 417	uart->ustcnt = USTCNT_UEN;
 418	info->xmit_fifo_size = 1;
 419	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
 420	(void)uart->urx.w;
 421
 422	/*
 423	 * Finally, enable sequencing and interrupts
 424	 */
 425#ifdef USE_INTS
 426	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | 
 427                 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
 428#else
 429	uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
 430#endif
 431
 432	if (info->tty)
 433		clear_bit(TTY_IO_ERROR, &info->tty->flags);
 434	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 435
 436	/*
 437	 * and set the speed of the serial port
 438	 */
 439
 440	change_speed(info);
 441
 442	info->flags |= S_INITIALIZED;
 443	local_irq_restore(flags);
 444	return 0;
 445}
 446
 447/*
 448 * This routine will shutdown a serial port; interrupts are disabled, and
 449 * DTR is dropped if the hangup on close termio flag is on.
 450 */
 451static void shutdown(struct m68k_serial * info)
 452{
 453	m68328_uart *uart = &uart_addr[info->line];
 454	unsigned long	flags;
 455
 456	uart->ustcnt = 0; /* All off! */
 457	if (!(info->flags & S_INITIALIZED))
 458		return;
 459
 460	local_irq_save(flags);
 461	
 462	if (info->xmit_buf) {
 463		free_page((unsigned long) info->xmit_buf);
 464		info->xmit_buf = 0;
 465	}
 466
 467	if (info->tty)
 468		set_bit(TTY_IO_ERROR, &info->tty->flags);
 469	
 470	info->flags &= ~S_INITIALIZED;
 471	local_irq_restore(flags);
 472}
 473
 474struct {
 475	int divisor, prescale;
 476}
 477#ifndef CONFIG_M68VZ328
 478 hw_baud_table[18] = {
 479	{0,0}, /* 0 */
 480	{0,0}, /* 50 */
 481	{0,0}, /* 75 */
 482	{0,0}, /* 110 */
 483	{0,0}, /* 134 */
 484	{0,0}, /* 150 */
 485	{0,0}, /* 200 */
 486	{7,0x26}, /* 300 */
 487	{6,0x26}, /* 600 */
 488	{5,0x26}, /* 1200 */
 489	{0,0}, /* 1800 */
 490	{4,0x26}, /* 2400 */
 491	{3,0x26}, /* 4800 */
 492	{2,0x26}, /* 9600 */
 493	{1,0x26}, /* 19200 */
 494	{0,0x26}, /* 38400 */
 495	{1,0x38}, /* 57600 */
 496	{0,0x38}, /* 115200 */
 497};
 498#else
 499 hw_baud_table[18] = {
 500                 {0,0}, /* 0 */
 501                 {0,0}, /* 50 */
 502                 {0,0}, /* 75 */
 503                 {0,0}, /* 110 */
 504                 {0,0}, /* 134 */
 505                 {0,0}, /* 150 */
 506                 {0,0}, /* 200 */
 507                 {0,0}, /* 300 */
 508                 {7,0x26}, /* 600 */
 509                 {6,0x26}, /* 1200 */
 510                 {0,0}, /* 1800 */
 511                 {5,0x26}, /* 2400 */
 512                 {4,0x26}, /* 4800 */
 513                 {3,0x26}, /* 9600 */
 514                 {2,0x26}, /* 19200 */
 515                 {1,0x26}, /* 38400 */
 516                 {0,0x26}, /* 57600 */
 517                 {1,0x38}, /* 115200 */
 518}; 
 519#endif
 520/* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
 521
 522/*
 523 * This routine is called to set the UART divisor registers to match
 524 * the specified baud rate for a serial port.
 525 */
 526static void change_speed(struct m68k_serial *info)
 527{
 528	m68328_uart *uart = &uart_addr[info->line];
 529	unsigned short port;
 530	unsigned short ustcnt;
 531	unsigned cflag;
 532	int	i;
 533
 534	if (!info->tty || !info->tty->termios)
 535		return;
 536	cflag = info->tty->termios->c_cflag;
 537	if (!(port = info->port))
 538		return;
 539
 540	ustcnt = uart->ustcnt;
 541	uart->ustcnt = ustcnt & ~USTCNT_TXEN;
 542
 543	i = cflag & CBAUD;
 544        if (i & CBAUDEX) {
 545                i = (i & ~CBAUDEX) + B38400;
 546        }
 547
 548	info->baud = baud_table[i];
 549	uart->ubaud = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) | 
 550		PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
 551
 552	ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
 553	
 554	if ((cflag & CSIZE) == CS8)
 555		ustcnt |= USTCNT_8_7;
 556		
 557	if (cflag & CSTOPB)
 558		ustcnt |= USTCNT_STOP;
 559
 560	if (cflag & PARENB)
 561		ustcnt |= USTCNT_PARITYEN;
 562	if (cflag & PARODD)
 563		ustcnt |= USTCNT_ODD_EVEN;
 564	
 565#ifdef CONFIG_SERIAL_68328_RTS_CTS
 566	if (cflag & CRTSCTS) {
 567		uart->utx.w &= ~ UTX_NOCTS;
 568	} else {
 569		uart->utx.w |= UTX_NOCTS;
 570	}
 571#endif
 572
 573	ustcnt |= USTCNT_TXEN;
 574	
 575	uart->ustcnt = ustcnt;
 576	return;
 577}
 578
 579/*
 580 * Fair output driver allows a process to speak.
 581 */
 582static void rs_fair_output(void)
 583{
 584	int left;		/* Output no more than that */
 585	unsigned long flags;
 586	struct m68k_serial *info = &m68k_soft[0];
 587	char c;
 588
 589	if (info == 0) return;
 590	if (info->xmit_buf == 0) return;
 591
 592	local_irq_save(flags);
 593	left = info->xmit_cnt;
 594	while (left != 0) {
 595		c = info->xmit_buf[info->xmit_tail];
 596		info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
 597		info->xmit_cnt--;
 598		local_irq_restore(flags);
 599
 600		rs_put_char(c);
 601
 602		local_irq_save(flags);
 603		left = min(info->xmit_cnt, left-1);
 604	}
 605
 606	/* Last character is being transmitted now (hopefully). */
 607	udelay(5);
 608
 609	local_irq_restore(flags);
 610	return;
 611}
 612
 613/*
 614 * m68k_console_print is registered for printk.
 615 */
 616void console_print_68328(const char *p)
 617{
 618	char c;
 619	
 620	while((c=*(p++)) != 0) {
 621		if(c == '\n')
 622			rs_put_char('\r');
 623		rs_put_char(c);
 624	}
 625
 626	/* Comment this if you want to have a strict interrupt-driven output */
 627	rs_fair_output();
 628
 629	return;
 630}
 631
 632static void rs_set_ldisc(struct tty_struct *tty)
 633{
 634	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 635
 636	if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
 637		return;
 638
 639	info->is_cons = (tty->termios->c_line == N_TTY);
 640	
 641	printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
 642}
 643
 644static void rs_flush_chars(struct tty_struct *tty)
 645{
 646	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 647	m68328_uart *uart = &uart_addr[info->line];
 648	unsigned long flags;
 649
 650	if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
 651		return;
 652#ifndef USE_INTS
 653	for(;;) {
 654#endif
 655
 656	/* Enable transmitter */
 657	local_irq_save(flags);
 658
 659	if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
 660			!info->xmit_buf) {
 661		local_irq_restore(flags);
 662		return;
 663	}
 664
 665#ifdef USE_INTS
 666	uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
 667#else
 668	uart->ustcnt |= USTCNT_TXEN;
 669#endif
 670
 671#ifdef USE_INTS
 672	if (uart->utx.w & UTX_TX_AVAIL) {
 673#else
 674	if (1) {
 675#endif
 676		/* Send char */
 677		uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 678		info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 679		info->xmit_cnt--;
 680	}
 681
 682#ifndef USE_INTS
 683	while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 684	}
 685#endif
 686	local_irq_restore(flags);
 687}
 688
 689extern void console_printn(const char * b, int count);
 690
 691static int rs_write(struct tty_struct * tty,
 692		    const unsigned char *buf, int count)
 693{
 694	int	c, total = 0;
 695	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 696	m68328_uart *uart = &uart_addr[info->line];
 697	unsigned long flags;
 698
 699	if (serial_paranoia_check(info, tty->name, "rs_write"))
 700		return 0;
 701
 702	if (!tty || !info->xmit_buf)
 703		return 0;
 704
 705	local_save_flags(flags);
 706	while (1) {
 707		local_irq_disable();		
 708		c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
 709				   SERIAL_XMIT_SIZE - info->xmit_head));
 710		local_irq_restore(flags);
 711
 712		if (c <= 0)
 713			break;
 714
 715		memcpy(info->xmit_buf + info->xmit_head, buf, c);
 716
 717		local_irq_disable();
 718		info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
 719		info->xmit_cnt += c;
 720		local_irq_restore(flags);
 721		buf += c;
 722		count -= c;
 723		total += c;
 724	}
 725
 726	if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
 727		/* Enable transmitter */
 728		local_irq_disable();		
 729#ifndef USE_INTS
 730		while(info->xmit_cnt) {
 731#endif
 732
 733		uart->ustcnt |= USTCNT_TXEN;
 734#ifdef USE_INTS
 735		uart->ustcnt |= USTCNT_TX_INTR_MASK;
 736#else
 737		while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
 738#endif
 739		if (uart->utx.w & UTX_TX_AVAIL) {
 740			uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
 741			info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 742			info->xmit_cnt--;
 743		}
 744
 745#ifndef USE_INTS
 746		}
 747#endif
 748		local_irq_restore(flags);
 749	}
 750
 751	return total;
 752}
 753
 754static int rs_write_room(struct tty_struct *tty)
 755{
 756	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 757	int	ret;
 758				
 759	if (serial_paranoia_check(info, tty->name, "rs_write_room"))
 760		return 0;
 761	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
 762	if (ret < 0)
 763		ret = 0;
 764	return ret;
 765}
 766
 767static int rs_chars_in_buffer(struct tty_struct *tty)
 768{
 769	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 770				
 771	if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
 772		return 0;
 773	return info->xmit_cnt;
 774}
 775
 776static void rs_flush_buffer(struct tty_struct *tty)
 777{
 778	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 779	unsigned long flags;
 780				
 781	if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
 782		return;
 783	local_irq_save(flags);
 784	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 785	local_irq_restore(flags);
 786	tty_wakeup(tty);
 787}
 788
 789/*
 790 * ------------------------------------------------------------
 791 * rs_throttle()
 792 * 
 793 * This routine is called by the upper-layer tty layer to signal that
 794 * incoming characters should be throttled.
 795 * ------------------------------------------------------------
 796 */
 797static void rs_throttle(struct tty_struct * tty)
 798{
 799	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 800
 801	if (serial_paranoia_check(info, tty->name, "rs_throttle"))
 802		return;
 803	
 804	if (I_IXOFF(tty))
 805		info->x_char = STOP_CHAR(tty);
 806
 807	/* Turn off RTS line (do this atomic) */
 808}
 809
 810static void rs_unthrottle(struct tty_struct * tty)
 811{
 812	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
 813
 814	if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
 815		return;
 816	
 817	if (I_IXOFF(tty)) {
 818		if (info->x_char)
 819			info->x_char = 0;
 820		else
 821			info->x_char = START_CHAR(tty);
 822	}
 823
 824	/* Assert RTS line (do this atomic) */
 825}
 826
 827/*
 828 * ------------------------------------------------------------
 829 * rs_ioctl() and friends
 830 * ------------------------------------------------------------
 831 */
 832
 833static int get_serial_info(struct m68k_serial * info,
 834			   struct serial_struct * retinfo)
 835{
 836	struct serial_struct tmp;
 837  
 838	if (!retinfo)
 839		return -EFAULT;
 840	memset(&tmp, 0, sizeof(tmp));
 841	tmp.type = info->type;
 842	tmp.line = info->line;
 843	tmp.port = info->port;
 844	tmp.irq = info->irq;
 845	tmp.flags = info->flags;
 846	tmp.baud_base = info->baud_base;
 847	tmp.close_delay = info->close_delay;
 848	tmp.closing_wait = info->closing_wait;
 849	tmp.custom_divisor = info->custom_divisor;
 850	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 851		return -EFAULT;
 852
 853	return 0;
 854}
 855
 856static int set_serial_info(struct m68k_serial * info,
 857			   struct serial_struct * new_info)
 858{
 859	struct serial_struct new_serial;
 860	struct m68k_serial old_info;
 861	int 			retval = 0;
 862
 863	if (!new_info)
 864		return -EFAULT;
 865	if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
 866		return -EFAULT;
 867	old_info = *info;
 868
 869	if (!capable(CAP_SYS_ADMIN)) {
 870		if ((new_serial.baud_base != info->baud_base) ||
 871		    (new_serial.type != info->type) ||
 872		    (new_serial.close_delay != info->close_delay) ||
 873		    ((new_serial.flags & ~S_USR_MASK) !=
 874		     (info->flags & ~S_USR_MASK)))
 875			return -EPERM;
 876		info->flags = ((info->flags & ~S_USR_MASK) |
 877			       (new_serial.flags & S_USR_MASK));
 878		info->custom_divisor = new_serial.custom_divisor;
 879		goto check_and_exit;
 880	}
 881
 882	if (info->count > 1)
 883		return -EBUSY;
 884
 885	/*
 886	 * OK, past this point, all the error checking has been done.
 887	 * At this point, we start making changes.....
 888	 */
 889
 890	info->baud_base = new_serial.baud_base;
 891	info->flags = ((info->flags & ~S_FLAGS) |
 892			(new_serial.flags & S_FLAGS));
 893	info->type = new_serial.type;
 894	info->close_delay = new_serial.close_delay;
 895	info->closing_wait = new_serial.closing_wait;
 896
 897check_and_exit:
 898	retval = startup(info);
 899	return retval;
 900}
 901
 902/*
 903 * get_lsr_info - get line status register info
 904 *
 905 * Purpose: Let user call ioctl() to get info when the UART physically
 906 * 	    is emptied.  On bus types like RS485, the transmitter must
 907 * 	    release the bus after transmitting. This must be done when
 908 * 	    the transmit shift register is empty, not be done when the
 909 * 	    transmit holding register is empty.  This functionality
 910 * 	    allows an RS485 driver to be written in user space. 
 911 */
 912static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
 913{
 914#ifdef CONFIG_SERIAL_68328_RTS_CTS
 915	m68328_uart *uart = &uart_addr[info->line];
 916#endif
 917	unsigned char status;
 918	unsigned long flags;
 919
 920	local_irq_save(flags);
 921#ifdef CONFIG_SERIAL_68328_RTS_CTS
 922	status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
 923#else
 924	status = 0;
 925#endif
 926	local_irq_restore(flags);
 927	return put_user(status, value);
 928}
 929
 930/*
 931 * This routine sends a break character out the serial port.
 932 */
 933static void send_break(struct m68k_serial * info, unsigned int duration)
 934{
 935	m68328_uart *uart = &uart_addr[info->line];
 936        unsigned long flags;
 937        if (!info->port)
 938                return;
 939        local_irq_save(flags);
 940#ifdef USE_INTS	
 941	uart->utx.w |= UTX_SEND_BREAK;
 942	msleep_interruptible(duration);
 943	uart->utx.w &= ~UTX_SEND_BREAK;
 944#endif		
 945        local_irq_restore(flags);
 946}
 947
 948static int rs_ioctl(struct tty_struct *tty,
 949		    unsigned int cmd, unsigned long arg)
 950{
 951	struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
 952	int retval;
 953
 954	if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
 955		return -ENODEV;
 956
 957	if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
 958	    (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD)  &&
 959	    (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
 960		if (tty->flags & (1 << TTY_IO_ERROR))
 961		    return -EIO;
 962	}
 963	
 964	switch (cmd) {
 965		case TCSBRK:	/* SVID version: non-zero arg --> no break */
 966			retval = tty_check_change(tty);
 967			if (retval)
 968				return retval;
 969			tty_wait_until_sent(tty, 0);
 970			if (!arg)
 971				send_break(info, 250);	/* 1/4 second */
 972			return 0;
 973		case TCSBRKP:	/* support for POSIX tcsendbreak() */
 974			retval = tty_check_change(tty);
 975			if (retval)
 976				return retval;
 977			tty_wait_until_sent(tty, 0);
 978			send_break(info, arg ? arg*(100) : 250);
 979			return 0;
 980		case TIOCGSERIAL:
 981			return get_serial_info(info,
 982				       (struct serial_struct *) arg);
 983		case TIOCSSERIAL:
 984			return set_serial_info(info,
 985					       (struct serial_struct *) arg);
 986		case TIOCSERGETLSR: /* Get line status register */
 987			return get_lsr_info(info, (unsigned int *) arg);
 988		case TIOCSERGSTRUCT:
 989			if (copy_to_user((struct m68k_serial *) arg,
 990				    info, sizeof(struct m68k_serial)))
 991				return -EFAULT;
 992			return 0;
 993		default:
 994			return -ENOIOCTLCMD;
 995		}
 996	return 0;
 997}
 998
 999static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1000{
1001	struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1002
1003	change_speed(info);
1004
1005	if ((old_termios->c_cflag & CRTSCTS) &&
1006	    !(tty->termios->c_cflag & CRTSCTS)) {
1007		tty->hw_stopped = 0;
1008		rs_start(tty);
1009	}
1010	
1011}
1012
1013/*
1014 * ------------------------------------------------------------
1015 * rs_close()
1016 * 
1017 * This routine is called when the serial port gets closed.  First, we
1018 * wait for the last remaining data to be sent.  Then, we unlink its
1019 * S structure from the interrupt chain if necessary, and we free
1020 * that IRQ if nothing is left in the chain.
1021 * ------------------------------------------------------------
1022 */
1023static void rs_close(struct tty_struct *tty, struct file * filp)
1024{
1025	struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1026	m68328_uart *uart = &uart_addr[info->line];
1027	unsigned long flags;
1028
1029	if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1030		return;
1031	
1032	local_irq_save(flags);
1033	
1034	if (tty_hung_up_p(filp)) {
1035		local_irq_restore(flags);
1036		return;
1037	}
1038	
1039	if ((tty->count == 1) && (info->count != 1)) {
1040		/*
1041		 * Uh, oh.  tty->count is 1, which means that the tty
1042		 * structure will be freed.  Info->count should always
1043		 * be one in these conditions.  If it's greater than
1044		 * one, we've got real problems, since it means the
1045		 * serial port won't be shutdown.
1046		 */
1047		printk("rs_close: bad serial port count; tty->count is 1, "
1048		       "info->count is %d\n", info->count);
1049		info->count = 1;
1050	}
1051	if (--info->count < 0) {
1052		printk("rs_close: bad serial port count for ttyS%d: %d\n",
1053		       info->line, info->count);
1054		info->count = 0;
1055	}
1056	if (info->count) {
1057		local_irq_restore(flags);
1058		return;
1059	}
1060	info->flags |= S_CLOSING;
1061	/*
1062	 * Now we wait for the transmit buffer to clear; and we notify 
1063	 * the line discipline to only process XON/XOFF characters.
1064	 */
1065	tty->closing = 1;
1066	if (info->closing_wait != S_CLOSING_WAIT_NONE)
1067		tty_wait_until_sent(tty, info->closing_wait);
1068	/*
1069	 * At this point we stop accepting input.  To do this, we
1070	 * disable the receive line status interrupts, and tell the
1071	 * interrupt driver to stop checking the data ready bit in the
1072	 * line status register.
1073	 */
1074
1075	uart->ustcnt &= ~USTCNT_RXEN;
1076	uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1077
1078	shutdown(info);
1079	rs_flush_buffer(tty);
1080		
1081	tty_ldisc_flush(tty);
1082	tty->closing = 0;
1083	info->event = 0;
1084	info->tty = NULL;
1085#warning "This is not and has never been valid so fix it"	
1086#if 0
1087	if (tty->ldisc.num != ldiscs[N_TTY].num) {
1088		if (tty->ldisc.close)
1089			(tty->ldisc.close)(tty);
1090		tty->ldisc = ldiscs[N_TTY];
1091		tty->termios->c_line = N_TTY;
1092		if (tty->ldisc.open)
1093			(tty->ldisc.open)(tty);
1094	}
1095#endif	
1096	if (info->blocked_open) {
1097		if (info->close_delay) {
1098			msleep_interruptible(jiffies_to_msecs(info->close_delay));
1099		}
1100		wake_up_interruptible(&info->open_wait);
1101	}
1102	info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1103	wake_up_interruptible(&info->close_wait);
1104	local_irq_restore(flags);
1105}
1106
1107/*
1108 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1109 */
1110void rs_hangup(struct tty_struct *tty)
1111{
1112	struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1113	
1114	if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1115		return;
1116	
1117	rs_flush_buffer(tty);
1118	shutdown(info);
1119	info->event = 0;
1120	info->count = 0;
1121	info->flags &= ~S_NORMAL_ACTIVE;
1122	info->tty = NULL;
1123	wake_up_interruptible(&info->open_wait);
1124}
1125
1126/*
1127 * ------------------------------------------------------------
1128 * rs_open() and friends
1129 * ------------------------------------------------------------
1130 */
1131static int block_til_ready(struct tty_struct *tty, struct file * filp,
1132			   struct m68k_serial *info)
1133{
1134	DECLARE_WAITQUEUE(wait, current);
1135	int		retval;
1136	int		do_clocal = 0;
1137
1138	/*
1139	 * If the device is in the middle of being closed, then block
1140	 * until it's done, and then try again.
1141	 */
1142	if (info->flags & S_CLOSING) {
1143		interruptible_sleep_on(&info->close_wait);
1144#ifdef SERIAL_DO_RESTART
1145		if (info->flags & S_HUP_NOTIFY)
1146			return -EAGAIN;
1147		else
1148			return -ERESTARTSYS;
1149#else
1150		return -EAGAIN;
1151#endif
1152	}
1153	
1154	/*
1155	 * If non-blocking mode is set, or the port is not enabled,
1156	 * then make the check up front and then exit.
1157	 */
1158	if ((filp->f_flags & O_NONBLOCK) ||
1159	    (tty->flags & (1 << TTY_IO_ERROR))) {
1160		info->flags |= S_NORMAL_ACTIVE;
1161		return 0;
1162	}
1163
1164	if (tty->termios->c_cflag & CLOCAL)
1165		do_clocal = 1;
1166
1167	/*
1168	 * Block waiting for the carrier detect and the line to become
1169	 * free (i.e., not in use by the callout).  While we are in
1170	 * this loop, info->count is dropped by one, so that
1171	 * rs_close() knows when to free things.  We restore it upon
1172	 * exit, either normal or abnormal.
1173	 */
1174	retval = 0;
1175	add_wait_queue(&info->open_wait, &wait);
1176
1177	info->count--;
1178	info->blocked_open++;
1179	while (1) {
1180		local_irq_disable();
1181		m68k_rtsdtr(info, 1);
1182		local_irq_enable();
1183		current->state = TASK_INTERRUPTIBLE;
1184		if (tty_hung_up_p(filp) ||
1185		    !(info->flags & S_INITIALIZED)) {
1186#ifdef SERIAL_DO_RESTART
1187			if (info->flags & S_HUP_NOTIFY)
1188				retval = -EAGAIN;
1189			else
1190				retval = -ERESTARTSYS;	
1191#else
1192			retval = -EAGAIN;
1193#endif
1194			break;
1195		}
1196		if (!(info->flags & S_CLOSING) && do_clocal)
1197			break;
1198                if (signal_pending(current)) {
1199			retval = -ERESTARTSYS;
1200			break;
1201		}
1202		tty_unlock();
1203		schedule();
1204		tty_lock();
1205	}
1206	current->state = TASK_RUNNING;
1207	remove_wait_queue(&info->open_wait, &wait);
1208	if (!tty_hung_up_p(filp))
1209		info->count++;
1210	info->blocked_open--;
1211
1212	if (retval)
1213		return retval;
1214	info->flags |= S_NORMAL_ACTIVE;
1215	return 0;
1216}	
1217
1218/*
1219 * This routine is called whenever a serial port is opened.  It
1220 * enables interrupts for a serial port, linking in its S structure into
1221 * the IRQ chain.   It also performs the serial-specific
1222 * initialization for the tty structure.
1223 */
1224int rs_open(struct tty_struct *tty, struct file * filp)
1225{
1226	struct m68k_serial	*info;
1227	int 			retval, line;
1228
1229	line = tty->index;
1230	
1231	if (line >= NR_PORTS || line < 0) /* we have exactly one */
1232		return -ENODEV;
1233
1234	info = &m68k_soft[line];
1235
1236	if (serial_paranoia_check(info, tty->name, "rs_open"))
1237		return -ENODEV;
1238
1239	info->count++;
1240	tty->driver_data = info;
1241	info->tty = tty;
1242
1243	/*
1244	 * Start up serial port
1245	 */
1246	retval = startup(info);
1247	if (retval)
1248		return retval;
1249
1250	return block_til_ready(tty, filp, info);
1251}
1252
1253/* Finally, routines used to initialize the serial driver. */
1254
1255static void show_serial_version(void)
1256{
1257	printk("MC68328 serial driver version 1.00\n");
1258}
1259
1260static const struct tty_operations rs_ops = {
1261	.open = rs_open,
1262	.close = rs_close,
1263	.write = rs_write,
1264	.flush_chars = rs_flush_chars,
1265	.write_room = rs_write_room,
1266	.chars_in_buffer = rs_chars_in_buffer,
1267	.flush_buffer = rs_flush_buffer,
1268	.ioctl = rs_ioctl,
1269	.throttle = rs_throttle,
1270	.unthrottle = rs_unthrottle,
1271	.set_termios = rs_set_termios,
1272	.stop = rs_stop,
1273	.start = rs_start,
1274	.hangup = rs_hangup,
1275	.set_ldisc = rs_set_ldisc,
1276};
1277
1278/* rs_init inits the driver */
1279static int __init
1280rs68328_init(void)
1281{
1282	int flags, i;
1283	struct m68k_serial *info;
1284
1285	serial_driver = alloc_tty_driver(NR_PORTS);
1286	if (!serial_driver)
1287		return -ENOMEM;
1288
1289	show_serial_version();
1290
1291	/* Initialize the tty_driver structure */
1292	/* SPARC: Not all of this is exactly right for us. */
1293	
1294	serial_driver->name = "ttyS";
1295	serial_driver->major = TTY_MAJOR;
1296	serial_driver->minor_start = 64;
1297	serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1298	serial_driver->subtype = SERIAL_TYPE_NORMAL;
1299	serial_driver->init_termios = tty_std_termios;
1300	serial_driver->init_termios.c_cflag = 
1301			m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1302	serial_driver->flags = TTY_DRIVER_REAL_RAW;
1303	tty_set_operations(serial_driver, &rs_ops);
1304
1305	if (tty_register_driver(serial_driver)) {
1306		put_tty_driver(serial_driver);
1307		printk(KERN_ERR "Couldn't register serial driver\n");
1308		return -ENOMEM;
1309	}
1310
1311	local_irq_save(flags);
1312
1313	for(i=0;i<NR_PORTS;i++) {
1314
1315	    info = &m68k_soft[i];
1316	    info->magic = SERIAL_MAGIC;
1317	    info->port = (int) &uart_addr[i];
1318	    info->tty = NULL;
1319	    info->irq = uart_irqs[i];
1320	    info->custom_divisor = 16;
1321	    info->close_delay = 50;
1322	    info->closing_wait = 3000;
1323	    info->x_char = 0;
1324	    info->event = 0;
1325	    info->count = 0;
1326	    info->blocked_open = 0;
1327	    INIT_WORK(&info->tqueue, do_softint);
1328	    init_waitqueue_head(&info->open_wait);
1329	    init_waitqueue_head(&info->close_wait);
1330	    info->line = i;
1331	    info->is_cons = 1; /* Means shortcuts work */
1332	    
1333	    printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line, 
1334		   info->port, info->irq);
1335	    printk(" is a builtin MC68328 UART\n");
1336	    
1337#ifdef CONFIG_M68VZ328
1338		if (i > 0 )
1339			PJSEL &= 0xCF;  /* PSW enable second port output */
1340#endif
1341
1342	    if (request_irq(uart_irqs[i],
1343			    rs_interrupt,
1344			    IRQF_DISABLED,
1345			    "M68328_UART", info))
1346                panic("Unable to attach 68328 serial interrupt\n");
1347	}
1348	local_irq_restore(flags);
1349	return 0;
1350}
1351
1352module_init(rs68328_init);
1353
1354
1355
1356static void m68328_set_baud(void)
1357{
1358	unsigned short ustcnt;
1359	int	i;
1360
1361	ustcnt = USTCNT;
1362	USTCNT = ustcnt & ~USTCNT_TXEN;
1363
1364again:
1365	for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1366		if (baud_table[i] == m68328_console_baud)
1367			break;
1368	if (i >= ARRAY_SIZE(baud_table)) {
1369		m68328_console_baud = 9600;
1370		goto again;
1371	}
1372
1373	UBAUD = PUT_FIELD(UBAUD_DIVIDE,    hw_baud_table[i].divisor) | 
1374		PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1375	ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1376	ustcnt |= USTCNT_8_7;
1377	ustcnt |= USTCNT_TXEN;
1378	USTCNT = ustcnt;
1379	m68328_console_initted = 1;
1380	return;
1381}
1382
1383
1384int m68328_console_setup(struct console *cp, char *arg)
1385{
1386	int		i, n = CONSOLE_BAUD_RATE;
1387
1388	if (!cp)
1389		return(-1);
1390
1391	if (arg)
1392		n = simple_strtoul(arg,NULL,0);
1393
1394	for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1395		if (baud_table[i] == n)
1396			break;
1397	if (i < ARRAY_SIZE(baud_table)) {
1398		m68328_console_baud = n;
1399		m68328_console_cbaud = 0;
1400		if (i > 15) {
1401			m68328_console_cbaud |= CBAUDEX;
1402			i -= 15;
1403		}
1404		m68328_console_cbaud |= i;
1405	}
1406
1407	m68328_set_baud(); /* make sure baud rate changes */
1408	return(0);
1409}
1410
1411
1412static struct tty_driver *m68328_console_device(struct console *c, int *index)
1413{
1414	*index = c->index;
1415	return serial_driver;
1416}
1417
1418
1419void m68328_console_write (struct console *co, const char *str,
1420			   unsigned int count)
1421{
1422	if (!m68328_console_initted)
1423		m68328_set_baud();
1424    while (count--) {
1425        if (*str == '\n')
1426           rs_put_char('\r');
1427        rs_put_char( *str++ );
1428    }
1429}
1430
1431
1432static struct console m68328_driver = {
1433	.name		= "ttyS",
1434	.write		= m68328_console_write,
1435	.device		= m68328_console_device,
1436	.setup		= m68328_console_setup,
1437	.flags		= CON_PRINTBUFFER,
1438	.index		= -1,
1439};
1440
1441
1442static int __init m68328_console_init(void)
1443{
1444	register_console(&m68328_driver);
1445	return 0;
1446}
1447
1448console_initcall(m68328_console_init);