imx.c 23.5 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
/*
 *  linux/drivers/serial/imx.c
 *
 *  Driver for Motorola IMX serial ports
 *
 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 *
 *  Author: Sascha Hauer <sascha@saschahauer.de>
 *  Copyright (C) 2004 Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * [29-Mar-2005] Mike Lee
 * Added hardware handshake
 */
#include <linux/config.h>

#if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
39
#include <linux/platform_device.h>
L
Linus Torvalds 已提交
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>

/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_IMX_MAJOR	204
#define MINOR_START		41

#define NR_PORTS		2

#define IMX_ISR_PASS_LIMIT	256

/*
 * This is the size of our serial port register set.
 */
#define UART_PORT_SIZE	0x100

/*
 * This determines how often we check the modem status signals
 * for any change.  They generally aren't connected to an IRQ
 * so we have to poll them.  We also check immediately before
 * filling the TX fifo incase CTS has been dropped.
 */
#define MCTRL_TIMEOUT	(250*HZ/1000)

#define DRIVER_NAME "IMX-uart"

struct imx_port {
	struct uart_port	port;
	struct timer_list	timer;
	unsigned int		old_status;
76
	int txirq,rxirq,rtsirq;
L
Linus Torvalds 已提交
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
};

/*
 * Handle any change of modem status signal since we were last called.
 */
static void imx_mctrl_check(struct imx_port *sport)
{
	unsigned int status, changed;

	status = sport->port.ops->get_mctrl(&sport->port);
	changed = status ^ sport->old_status;

	if (changed == 0)
		return;

	sport->old_status = status;

	if (changed & TIOCM_RI)
		sport->port.icount.rng++;
	if (changed & TIOCM_DSR)
		sport->port.icount.dsr++;
	if (changed & TIOCM_CAR)
		uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
	if (changed & TIOCM_CTS)
		uart_handle_cts_change(&sport->port, status & TIOCM_CTS);

	wake_up_interruptible(&sport->port.info->delta_msr_wait);
}

/*
 * This is our per-port timeout handler, for checking the
 * modem status signals.
 */
static void imx_timeout(unsigned long data)
{
	struct imx_port *sport = (struct imx_port *)data;
	unsigned long flags;

	if (sport->port.info) {
		spin_lock_irqsave(&sport->port.lock, flags);
		imx_mctrl_check(sport);
		spin_unlock_irqrestore(&sport->port.lock, flags);

		mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
	}
}

/*
 * interrupts disabled on entry
 */
127
static void imx_stop_tx(struct uart_port *port)
L
Linus Torvalds 已提交
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
{
	struct imx_port *sport = (struct imx_port *)port;
	UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN;
}

/*
 * interrupts disabled on entry
 */
static void imx_stop_rx(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;
	UCR2((u32)sport->port.membase) &= ~UCR2_RXEN;
}

/*
 * Set the modem control timer to fire immediately.
 */
static void imx_enable_ms(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	mod_timer(&sport->timer, jiffies);
}

static inline void imx_transmit_buffer(struct imx_port *sport)
{
	struct circ_buf *xmit = &sport->port.info->xmit;

	do {
		/* send xmit->buf[xmit->tail]
		 * out the port here */
		URTX0((u32)sport->port.membase) = xmit->buf[xmit->tail];
		xmit->tail = (xmit->tail + 1) &
		         (UART_XMIT_SIZE - 1);
		sport->port.icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (!(UTS((u32)sport->port.membase) & UTS_TXFULL));

	if (uart_circ_empty(xmit))
168
		imx_stop_tx(&sport->port);
L
Linus Torvalds 已提交
169 170 171 172 173
}

/*
 * interrupts disabled on entry
 */
174
static void imx_start_tx(struct uart_port *port)
L
Linus Torvalds 已提交
175 176 177 178 179 180 181 182 183
{
	struct imx_port *sport = (struct imx_port *)port;

	UCR1((u32)sport->port.membase) |= UCR1_TXMPTYEN;

	if(UTS((u32)sport->port.membase) & UTS_TXEMPTY)
		imx_transmit_buffer(sport);
}

184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
static irqreturn_t imx_rtsint(int irq, void *dev_id, struct pt_regs *regs)
{
	struct imx_port *sport = (struct imx_port *)dev_id;
	unsigned int val = USR1((u32)sport->port.membase)&USR1_RTSS;
	unsigned long flags;

	spin_lock_irqsave(&sport->port.lock, flags);

	USR1((u32)sport->port.membase) = USR1_RTSD;
	uart_handle_cts_change(&sport->port, !!val);
	wake_up_interruptible(&sport->port.info->delta_msr_wait);

	spin_unlock_irqrestore(&sport->port.lock, flags);
	return IRQ_HANDLED;
}

L
Linus Torvalds 已提交
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)
{
	struct imx_port *sport = (struct imx_port *)dev_id;
	struct circ_buf *xmit = &sport->port.info->xmit;
	unsigned long flags;

	spin_lock_irqsave(&sport->port.lock,flags);
	if (sport->port.x_char)
	{
		/* Send next char */
		URTX0((u32)sport->port.membase) = sport->port.x_char;
		goto out;
	}

	if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
215
		imx_stop_tx(&sport->port);
L
Linus Torvalds 已提交
216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306
		goto out;
	}

	imx_transmit_buffer(sport);

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&sport->port);

out:
	spin_unlock_irqrestore(&sport->port.lock,flags);
	return IRQ_HANDLED;
}

static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs)
{
	struct imx_port *sport = dev_id;
	unsigned int rx,flg,ignored = 0;
	struct tty_struct *tty = sport->port.info->tty;
	unsigned long flags;

	rx = URXD0((u32)sport->port.membase);
	spin_lock_irqsave(&sport->port.lock,flags);

	do {
		flg = TTY_NORMAL;
		sport->port.icount.rx++;

		if( USR2((u32)sport->port.membase) & USR2_BRCD ) {
			USR2((u32)sport->port.membase) |= USR2_BRCD;
			if(uart_handle_break(&sport->port))
				goto ignore_char;
		}

		if (uart_handle_sysrq_char
		            (&sport->port, (unsigned char)rx, regs))
			goto ignore_char;

		if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) )
			goto handle_error;

	error_return:
		tty_insert_flip_char(tty, rx, flg);

	ignore_char:
		rx = URXD0((u32)sport->port.membase);
	} while(rx & URXD_CHARRDY);

out:
	spin_unlock_irqrestore(&sport->port.lock,flags);
	tty_flip_buffer_push(tty);
	return IRQ_HANDLED;

handle_error:
	if (rx & URXD_PRERR)
		sport->port.icount.parity++;
	else if (rx & URXD_FRMERR)
		sport->port.icount.frame++;
	if (rx & URXD_OVRRUN)
		sport->port.icount.overrun++;

	if (rx & sport->port.ignore_status_mask) {
		if (++ignored > 100)
			goto out;
		goto ignore_char;
	}

	rx &= sport->port.read_status_mask;

	if (rx & URXD_PRERR)
		flg = TTY_PARITY;
	else if (rx & URXD_FRMERR)
		flg = TTY_FRAME;
	if (rx & URXD_OVRRUN)
		flg = TTY_OVERRUN;

#ifdef SUPPORT_SYSRQ
	sport->port.sysrq = 0;
#endif
	goto error_return;
}

/*
 * Return TIOCSER_TEMT when transmitter is not busy.
 */
static unsigned int imx_tx_empty(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	return USR2((u32)sport->port.membase) & USR2_TXDC ?  TIOCSER_TEMT : 0;
}

307 308 309
/*
 * We have a modem side uart, so the meanings of RTS and CTS are inverted.
 */
L
Linus Torvalds 已提交
310 311
static unsigned int imx_get_mctrl(struct uart_port *port)
{
312 313 314 315 316 317 318 319 320 321
        struct imx_port *sport = (struct imx_port *)port;
        unsigned int tmp = TIOCM_DSR | TIOCM_CAR;

        if (USR1((u32)sport->port.membase) & USR1_RTSS)
                tmp |= TIOCM_CTS;

        if (UCR2((u32)sport->port.membase) & UCR2_CTS)
                tmp |= TIOCM_RTS;

        return tmp;
L
Linus Torvalds 已提交
322 323 324 325
}

static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
326 327 328 329 330 331
        struct imx_port *sport = (struct imx_port *)port;

        if (mctrl & TIOCM_RTS)
                UCR2((u32)sport->port.membase) |= UCR2_CTS;
        else
                UCR2((u32)sport->port.membase) &= ~UCR2_CTS;
L
Linus Torvalds 已提交
332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
}

/*
 * Interrupts always disabled.
 */
static void imx_break_ctl(struct uart_port *port, int break_state)
{
	struct imx_port *sport = (struct imx_port *)port;
	unsigned long flags;

	spin_lock_irqsave(&sport->port.lock, flags);

	if ( break_state != 0 )
		UCR1((u32)sport->port.membase) |= UCR1_SNDBRK;
	else
		UCR1((u32)sport->port.membase) &= ~UCR1_SNDBRK;

	spin_unlock_irqrestore(&sport->port.lock, flags);
}

#define TXTL 2 /* reset default */
#define RXTL 1 /* reset default */

355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
{
	unsigned int val;
	unsigned int ufcr_rfdiv;

	/* set receiver / transmitter trigger level.
	 * RFDIV is set such way to satisfy requested uartclk value
	 */
	val = TXTL<<10 | RXTL;
	ufcr_rfdiv = (imx_get_perclk1() + sport->port.uartclk / 2) / sport->port.uartclk;

	if(!ufcr_rfdiv)
		ufcr_rfdiv = 1;

	if(ufcr_rfdiv >= 7)
		ufcr_rfdiv = 6;
	else
		ufcr_rfdiv = 6 - ufcr_rfdiv;

	val |= UFCR_RFDIV & (ufcr_rfdiv << 7);

	UFCR((u32)sport->port.membase) = val;

	return 0;
}

L
Linus Torvalds 已提交
381 382 383 384 385 386
static int imx_startup(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;
	int retval;
	unsigned long flags;

387
	imx_setup_ufcr(sport, 0);
L
Linus Torvalds 已提交
388 389 390 391 392 393 394 395 396 397 398

	/* disable the DREN bit (Data Ready interrupt enable) before
	 * requesting IRQs
	 */
	UCR4((u32)sport->port.membase) &= ~UCR4_DREN;

	/*
	 * Allocate the IRQ
	 */
	retval = request_irq(sport->rxirq, imx_rxint, 0,
			     DRIVER_NAME, sport);
399
	if (retval) goto error_out1;
L
Linus Torvalds 已提交
400 401

	retval = request_irq(sport->txirq, imx_txint, 0,
402
			     DRIVER_NAME, sport);
403
	if (retval) goto error_out2;
L
Linus Torvalds 已提交
404

405 406
	retval = request_irq(sport->rtsirq, imx_rtsint,
			     SA_TRIGGER_FALLING | SA_TRIGGER_RISING,
407 408 409
			     DRIVER_NAME, sport);
	if (retval) goto error_out3;

L
Linus Torvalds 已提交
410 411 412 413
	/*
	 * Finally, clear and enable interrupts
	 */

414
	USR1((u32)sport->port.membase) = USR1_RTSD;
L
Linus Torvalds 已提交
415
	UCR1((u32)sport->port.membase) |=
416
	                 (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
L
Linus Torvalds 已提交
417 418 419 420 421 422 423 424 425 426 427

	UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);
	/*
	 * Enable modem status interrupts
	 */
	spin_lock_irqsave(&sport->port.lock,flags);
	imx_enable_ms(&sport->port);
	spin_unlock_irqrestore(&sport->port.lock,flags);

	return 0;

428 429
error_out3:
	free_irq(sport->txirq, sport);
L
Linus Torvalds 已提交
430
error_out2:
431 432
	free_irq(sport->rxirq, sport);
error_out1:
L
Linus Torvalds 已提交
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
	return retval;
}

static void imx_shutdown(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	/*
	 * Stop our timer.
	 */
	del_timer_sync(&sport->timer);

	/*
	 * Free the interrupts
	 */
448
	free_irq(sport->rtsirq, sport);
L
Linus Torvalds 已提交
449 450 451 452 453 454 455 456
	free_irq(sport->txirq, sport);
	free_irq(sport->rxirq, sport);

	/*
	 * Disable all interrupts, port and break condition.
	 */

	UCR1((u32)sport->port.membase) &=
457
	                 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
L
Linus Torvalds 已提交
458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
}

static void
imx_set_termios(struct uart_port *port, struct termios *termios,
		   struct termios *old)
{
	struct imx_port *sport = (struct imx_port *)port;
	unsigned long flags;
	unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;

	/*
	 * If we don't support modem control lines, don't allow
	 * these to be set.
	 */
	if (0) {
		termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
		termios->c_cflag |= CLOCAL;
	}

	/*
	 * We only support CS7 and CS8.
	 */
	while ((termios->c_cflag & CSIZE) != CS7 &&
	       (termios->c_cflag & CSIZE) != CS8) {
		termios->c_cflag &= ~CSIZE;
		termios->c_cflag |= old_csize;
		old_csize = CS8;
	}

	if ((termios->c_cflag & CSIZE) == CS8)
		ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
	else
		ucr2 = UCR2_SRST | UCR2_IRTS;

	if (termios->c_cflag & CRTSCTS) {
		ucr2 &= ~UCR2_IRTS;
		ucr2 |= UCR2_CTSC;
	}

	if (termios->c_cflag & CSTOPB)
		ucr2 |= UCR2_STPB;
	if (termios->c_cflag & PARENB) {
		ucr2 |= UCR2_PREN;
502
		if (termios->c_cflag & PARODD)
L
Linus Torvalds 已提交
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
			ucr2 |= UCR2_PROE;
	}

	/*
	 * Ask the core to calculate the divisor for us.
	 */
	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
	quot = uart_get_divisor(port, baud);

	spin_lock_irqsave(&sport->port.lock, flags);

	sport->port.read_status_mask = 0;
	if (termios->c_iflag & INPCK)
		sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
	if (termios->c_iflag & (BRKINT | PARMRK))
		sport->port.read_status_mask |= URXD_BRK;

	/*
	 * Characters to ignore
	 */
	sport->port.ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		sport->port.ignore_status_mask |= URXD_PRERR;
	if (termios->c_iflag & IGNBRK) {
		sport->port.ignore_status_mask |= URXD_BRK;
		/*
		 * If we're ignoring parity and break indicators,
		 * ignore overruns too (for real raw support).
		 */
		if (termios->c_iflag & IGNPAR)
			sport->port.ignore_status_mask |= URXD_OVRRUN;
	}

	del_timer_sync(&sport->timer);

	/*
	 * Update the per-port timeout.
	 */
	uart_update_timeout(port, termios->c_cflag, baud);

	/*
	 * disable interrupts and drain transmitter
	 */
	old_ucr1 = UCR1((u32)sport->port.membase);
547
	UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
L
Linus Torvalds 已提交
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667

	while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))
		barrier();

	/* then, disable everything */
	old_txrxen = UCR2((u32)sport->port.membase) & ( UCR2_TXEN | UCR2_RXEN );
	UCR2((u32)sport->port.membase) &= ~( UCR2_TXEN | UCR2_RXEN);

	/* set the parity, stop bits and data size */
	UCR2((u32)sport->port.membase) = ucr2;

	/* set the baud rate. We assume uartclk = 16 MHz
	 *
	 * baud * 16   UBIR - 1
	 * --------- = --------
	 *  uartclk    UBMR - 1
	 */
	UBIR((u32)sport->port.membase) = (baud / 100) - 1;
	UBMR((u32)sport->port.membase) = 10000 - 1;

	UCR1((u32)sport->port.membase) = old_ucr1;
	UCR2((u32)sport->port.membase) |= old_txrxen;

	if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
		imx_enable_ms(&sport->port);

	spin_unlock_irqrestore(&sport->port.lock, flags);
}

static const char *imx_type(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	return sport->port.type == PORT_IMX ? "IMX" : NULL;
}

/*
 * Release the memory region(s) being used by 'port'.
 */
static void imx_release_port(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
}

/*
 * Request the memory region(s) being used by 'port'.
 */
static int imx_request_port(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
			"imx-uart") != NULL ? 0 : -EBUSY;
}

/*
 * Configure/autoconfigure the port.
 */
static void imx_config_port(struct uart_port *port, int flags)
{
	struct imx_port *sport = (struct imx_port *)port;

	if (flags & UART_CONFIG_TYPE &&
	    imx_request_port(&sport->port) == 0)
		sport->port.type = PORT_IMX;
}

/*
 * Verify the new serial_struct (for TIOCSSERIAL).
 * The only change we allow are to the flags and type, and
 * even then only between PORT_IMX and PORT_UNKNOWN
 */
static int
imx_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	struct imx_port *sport = (struct imx_port *)port;
	int ret = 0;

	if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
		ret = -EINVAL;
	if (sport->port.irq != ser->irq)
		ret = -EINVAL;
	if (ser->io_type != UPIO_MEM)
		ret = -EINVAL;
	if (sport->port.uartclk / 16 != ser->baud_base)
		ret = -EINVAL;
	if ((void *)sport->port.mapbase != ser->iomem_base)
		ret = -EINVAL;
	if (sport->port.iobase != ser->port)
		ret = -EINVAL;
	if (ser->hub6 != 0)
		ret = -EINVAL;
	return ret;
}

static struct uart_ops imx_pops = {
	.tx_empty	= imx_tx_empty,
	.set_mctrl	= imx_set_mctrl,
	.get_mctrl	= imx_get_mctrl,
	.stop_tx	= imx_stop_tx,
	.start_tx	= imx_start_tx,
	.stop_rx	= imx_stop_rx,
	.enable_ms	= imx_enable_ms,
	.break_ctl	= imx_break_ctl,
	.startup	= imx_startup,
	.shutdown	= imx_shutdown,
	.set_termios	= imx_set_termios,
	.type		= imx_type,
	.release_port	= imx_release_port,
	.request_port	= imx_request_port,
	.config_port	= imx_config_port,
	.verify_port	= imx_verify_port,
};

static struct imx_port imx_ports[] = {
	{
	.txirq  = UART1_MINT_TX,
	.rxirq  = UART1_MINT_RX,
668
	.rtsirq = UART1_MINT_RTS,
L
Linus Torvalds 已提交
669 670
	.port	= {
		.type		= PORT_IMX,
671
		.iotype		= UPIO_MEM,
L
Linus Torvalds 已提交
672 673 674 675 676
		.membase	= (void *)IMX_UART1_BASE,
		.mapbase	= IMX_UART1_BASE, /* FIXME */
		.irq		= UART1_MINT_RX,
		.uartclk	= 16000000,
		.fifosize	= 8,
677
		.flags		= UPF_BOOT_AUTOCONF,
L
Linus Torvalds 已提交
678 679 680 681 682 683
		.ops		= &imx_pops,
		.line		= 0,
	},
	}, {
	.txirq  = UART2_MINT_TX,
	.rxirq  = UART2_MINT_RX,
684
	.rtsirq = UART2_MINT_RTS,
L
Linus Torvalds 已提交
685 686
	.port	= {
		.type		= PORT_IMX,
687
		.iotype		= UPIO_MEM,
L
Linus Torvalds 已提交
688 689 690 691 692
		.membase	= (void *)IMX_UART2_BASE,
		.mapbase	= IMX_UART2_BASE, /* FIXME */
		.irq		= UART2_MINT_RX,
		.uartclk	= 16000000,
		.fifosize	= 8,
693
		.flags		= UPF_BOOT_AUTOCONF,
L
Linus Torvalds 已提交
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
		.ops		= &imx_pops,
		.line		= 1,
	},
	}
};

/*
 * Setup the IMX serial ports.
 * Note also that we support "console=ttySMXx" where "x" is either 0 or 1.
 * Which serial port this ends up being depends on the machine you're
 * running this kernel on.  I'm not convinced that this is a good idea,
 * but that's the way it traditionally works.
 *
 */
static void __init imx_init_ports(void)
{
	static int first = 1;
	int i;

	if (!first)
		return;
	first = 0;

	for (i = 0; i < ARRAY_SIZE(imx_ports); i++) {
		init_timer(&imx_ports[i].timer);
		imx_ports[i].timer.function = imx_timeout;
		imx_ports[i].timer.data     = (unsigned long)&imx_ports[i];
	}

	imx_gpio_mode(PC9_PF_UART1_CTS);
	imx_gpio_mode(PC10_PF_UART1_RTS);
	imx_gpio_mode(PC11_PF_UART1_TXD);
	imx_gpio_mode(PC12_PF_UART1_RXD);
	imx_gpio_mode(PB28_PF_UART2_CTS);
	imx_gpio_mode(PB29_PF_UART2_RTS);

	imx_gpio_mode(PB30_PF_UART2_TXD);
	imx_gpio_mode(PB31_PF_UART2_RXD);

#if 0 /* We don't need these, on the mx1 the _modem_ side of the uart
       * is implemented.
       */
	imx_gpio_mode(PD7_AF_UART2_DTR);
	imx_gpio_mode(PD8_AF_UART2_DCD);
	imx_gpio_mode(PD9_AF_UART2_RI);
	imx_gpio_mode(PD10_AF_UART2_DSR);
#endif


}

#ifdef CONFIG_SERIAL_IMX_CONSOLE

/*
 * Interrupts are disabled on entering
 */
static void
imx_console_write(struct console *co, const char *s, unsigned int count)
{
	struct imx_port *sport = &imx_ports[co->index];
	unsigned int old_ucr1, old_ucr2, i;

	/*
	 *	First, save UCR1/2 and then disable interrupts
	 */
	old_ucr1 = UCR1((u32)sport->port.membase);
	old_ucr2 = UCR2((u32)sport->port.membase);

	UCR1((u32)sport->port.membase) =
	                   (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)
764
	                   & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN);
L
Linus Torvalds 已提交
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801
	UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;

	/*
	 *	Now, do each character
	 */
	for (i = 0; i < count; i++) {

		while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
			barrier();

		URTX0((u32)sport->port.membase) = s[i];

		if (s[i] == '\n') {
			while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
				barrier();
			URTX0((u32)sport->port.membase) = '\r';
		}
	}

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore UCR1/2
	 */
	while (!(USR2((u32)sport->port.membase) & USR2_TXDC));

	UCR1((u32)sport->port.membase) = old_ucr1;
	UCR2((u32)sport->port.membase) = old_ucr2;
}

/*
 * If the port was already initialised (eg, by a boot loader),
 * try to determine the current setup.
 */
static void __init
imx_console_get_options(struct imx_port *sport, int *baud,
			   int *parity, int *bits)
{
802

L
Linus Torvalds 已提交
803 804 805
	if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) {
		/* ok, the port was enabled */
		unsigned int ucr2, ubir,ubmr, uartclk;
806 807
		unsigned int baud_raw;
		unsigned int ucfr_rfdiv;
L
Linus Torvalds 已提交
808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826

		ucr2 = UCR2((u32)sport->port.membase);

		*parity = 'n';
		if (ucr2 & UCR2_PREN) {
			if (ucr2 & UCR2_PROE)
				*parity = 'o';
			else
				*parity = 'e';
		}

		if (ucr2 & UCR2_WS)
			*bits = 8;
		else
			*bits = 7;

		ubir = UBIR((u32)sport->port.membase) & 0xffff;
		ubmr = UBMR((u32)sport->port.membase) & 0xffff;

827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854

		ucfr_rfdiv = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) >> 7;
		if (ucfr_rfdiv == 6)
			ucfr_rfdiv = 7;
		else
			ucfr_rfdiv = 6 - ucfr_rfdiv;

		uartclk = imx_get_perclk1();
		uartclk /= ucfr_rfdiv;

		{	/*
			 * The next code provides exact computation of
			 *   baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
			 * without need of float support or long long division,
			 * which would be required to prevent 32bit arithmetic overflow
			 */
			unsigned int mul = ubir + 1;
			unsigned int div = 16 * (ubmr + 1);
			unsigned int rem = uartclk % div;

			baud_raw = (uartclk / div) * mul;
			baud_raw += (rem * mul + div / 2) / div;
			*baud = (baud_raw + 50) / 100 * 100;
		}

		if(*baud != baud_raw)
			printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
				baud_raw, *baud);
L
Linus Torvalds 已提交
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880
	}
}

static int __init
imx_console_setup(struct console *co, char *options)
{
	struct imx_port *sport;
	int baud = 9600;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	/*
	 * Check whether an invalid uart number has been specified, and
	 * if so, search for the first available port that does have
	 * console support.
	 */
	if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
		co->index = 0;
	sport = &imx_ports[co->index];

	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		imx_console_get_options(sport, &baud, &parity, &bits);

881 882
	imx_setup_ufcr(sport, 0);

L
Linus Torvalds 已提交
883 884 885
	return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}

886
static struct uart_driver imx_reg;
L
Linus Torvalds 已提交
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
static struct console imx_console = {
	.name		= "ttySMX",
	.write		= imx_console_write,
	.device		= uart_console_device,
	.setup		= imx_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &imx_reg,
};

static int __init imx_rs_console_init(void)
{
	imx_init_ports();
	register_console(&imx_console);
	return 0;
}
console_initcall(imx_rs_console_init);

#define IMX_CONSOLE	&imx_console
#else
#define IMX_CONSOLE	NULL
#endif

static struct uart_driver imx_reg = {
	.owner          = THIS_MODULE,
	.driver_name    = DRIVER_NAME,
	.dev_name       = "ttySMX",
	.devfs_name	= "ttsmx/",
	.major          = SERIAL_IMX_MAJOR,
	.minor          = MINOR_START,
	.nr             = ARRAY_SIZE(imx_ports),
	.cons           = IMX_CONSOLE,
};

921
static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
L
Linus Torvalds 已提交
922
{
923
        struct imx_port *sport = platform_get_drvdata(dev);
L
Linus Torvalds 已提交
924

925
        if (sport)
L
Linus Torvalds 已提交
926 927 928 929 930
                uart_suspend_port(&imx_reg, &sport->port);

        return 0;
}

931
static int serial_imx_resume(struct platform_device *dev)
L
Linus Torvalds 已提交
932
{
933
        struct imx_port *sport = platform_get_drvdata(dev);
L
Linus Torvalds 已提交
934

935
        if (sport)
L
Linus Torvalds 已提交
936 937 938 939 940
                uart_resume_port(&imx_reg, &sport->port);

        return 0;
}

941
static int serial_imx_probe(struct platform_device *dev)
L
Linus Torvalds 已提交
942
{
943
	imx_ports[dev->id].port.dev = &dev->dev;
L
Linus Torvalds 已提交
944
	uart_add_one_port(&imx_reg, &imx_ports[dev->id].port);
945
	platform_set_drvdata(dev, &imx_ports[dev->id]);
L
Linus Torvalds 已提交
946 947 948
	return 0;
}

949
static int serial_imx_remove(struct platform_device *dev)
L
Linus Torvalds 已提交
950
{
951
	struct imx_port *sport = platform_get_drvdata(dev);
L
Linus Torvalds 已提交
952

953
	platform_set_drvdata(dev, NULL);
L
Linus Torvalds 已提交
954 955 956 957 958 959 960

	if (sport)
		uart_remove_one_port(&imx_reg, &sport->port);

	return 0;
}

961
static struct platform_driver serial_imx_driver = {
L
Linus Torvalds 已提交
962 963 964 965 966
        .probe          = serial_imx_probe,
        .remove         = serial_imx_remove,

	.suspend	= serial_imx_suspend,
	.resume		= serial_imx_resume,
967 968 969
	.driver		= {
	        .name	= "imx-uart",
	},
L
Linus Torvalds 已提交
970 971 972 973 974 975 976 977 978 979 980 981 982 983
};

static int __init imx_serial_init(void)
{
	int ret;

	printk(KERN_INFO "Serial: IMX driver\n");

	imx_init_ports();

	ret = uart_register_driver(&imx_reg);
	if (ret)
		return ret;

984
	ret = platform_driver_register(&serial_imx_driver);
L
Linus Torvalds 已提交
985 986 987 988 989 990 991 992 993
	if (ret != 0)
		uart_unregister_driver(&imx_reg);

	return 0;
}

static void __exit imx_serial_exit(void)
{
	uart_unregister_driver(&imx_reg);
994
	platform_driver_unregister(&serial_imx_driver);
L
Linus Torvalds 已提交
995 996 997 998 999 1000 1001 1002
}

module_init(imx_serial_init);
module_exit(imx_serial_exit);

MODULE_AUTHOR("Sascha Hauer");
MODULE_DESCRIPTION("IMX generic serial port driver");
MODULE_LICENSE("GPL");