2 * linux/drivers/serial/imx.c
4 * Driver for Motorola IMX serial ports
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
8 * Author: Sascha Hauer <sascha@saschahauer.de>
9 * Copyright (C) 2004 Pengutronix
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * [29-Mar-2005] Mike Lee
26 * Added hardware handshake
29 #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
33 #include <linux/module.h>
34 #include <linux/ioport.h>
35 #include <linux/init.h>
36 #include <linux/console.h>
37 #include <linux/sysrq.h>
38 #include <linux/platform_device.h>
39 #include <linux/tty.h>
40 #include <linux/tty_flip.h>
41 #include <linux/serial_core.h>
42 #include <linux/serial.h>
43 #include <linux/clk.h>
47 #include <mach/hardware.h>
48 #include <mach/imx-uart.h>
50 /* Register definitions */
51 #define URXD0 0x0 /* Receiver Register */
52 #define URTX0 0x40 /* Transmitter Register */
53 #define UCR1 0x80 /* Control Register 1 */
54 #define UCR2 0x84 /* Control Register 2 */
55 #define UCR3 0x88 /* Control Register 3 */
56 #define UCR4 0x8c /* Control Register 4 */
57 #define UFCR 0x90 /* FIFO Control Register */
58 #define USR1 0x94 /* Status Register 1 */
59 #define USR2 0x98 /* Status Register 2 */
60 #define UESC 0x9c /* Escape Character Register */
61 #define UTIM 0xa0 /* Escape Timer Register */
62 #define UBIR 0xa4 /* BRM Incremental Register */
63 #define UBMR 0xa8 /* BRM Modulator Register */
64 #define UBRC 0xac /* Baud Rate Count Register */
65 #if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX2
66 #define ONEMS 0xb0 /* One Millisecond register */
67 #define UTS 0xb4 /* UART Test Register */
69 #ifdef CONFIG_ARCH_MX1
70 #define BIPR1 0xb0 /* Incremental Preset Register 1 */
71 #define BIPR2 0xb4 /* Incremental Preset Register 2 */
72 #define BIPR3 0xb8 /* Incremental Preset Register 3 */
73 #define BIPR4 0xbc /* Incremental Preset Register 4 */
74 #define BMPR1 0xc0 /* BRM Modulator Register 1 */
75 #define BMPR2 0xc4 /* BRM Modulator Register 2 */
76 #define BMPR3 0xc8 /* BRM Modulator Register 3 */
77 #define BMPR4 0xcc /* BRM Modulator Register 4 */
78 #define UTS 0xd0 /* UART Test Register */
81 /* UART Control Register Bit Fields.*/
82 #define URXD_CHARRDY (1<<15)
83 #define URXD_ERR (1<<14)
84 #define URXD_OVRRUN (1<<13)
85 #define URXD_FRMERR (1<<12)
86 #define URXD_BRK (1<<11)
87 #define URXD_PRERR (1<<10)
88 #define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
89 #define UCR1_ADBR (1<<14) /* Auto detect baud rate */
90 #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
91 #define UCR1_IDEN (1<<12) /* Idle condition interrupt */
92 #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
93 #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
94 #define UCR1_IREN (1<<7) /* Infrared interface enable */
95 #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
96 #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
97 #define UCR1_SNDBRK (1<<4) /* Send break */
98 #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
99 #ifdef CONFIG_ARCH_MX1
100 #define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
102 #if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX2
103 #define UCR1_UARTCLKEN (0) /* not present on mx2/mx3 */
105 #define UCR1_DOZE (1<<1) /* Doze */
106 #define UCR1_UARTEN (1<<0) /* UART enabled */
107 #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
108 #define UCR2_IRTS (1<<14) /* Ignore RTS pin */
109 #define UCR2_CTSC (1<<13) /* CTS pin control */
110 #define UCR2_CTS (1<<12) /* Clear to send */
111 #define UCR2_ESCEN (1<<11) /* Escape enable */
112 #define UCR2_PREN (1<<8) /* Parity enable */
113 #define UCR2_PROE (1<<7) /* Parity odd/even */
114 #define UCR2_STPB (1<<6) /* Stop */
115 #define UCR2_WS (1<<5) /* Word size */
116 #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
117 #define UCR2_TXEN (1<<2) /* Transmitter enabled */
118 #define UCR2_RXEN (1<<1) /* Receiver enabled */
119 #define UCR2_SRST (1<<0) /* SW reset */
120 #define UCR3_DTREN (1<<13) /* DTR interrupt enable */
121 #define UCR3_PARERREN (1<<12) /* Parity enable */
122 #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
123 #define UCR3_DSR (1<<10) /* Data set ready */
124 #define UCR3_DCD (1<<9) /* Data carrier detect */
125 #define UCR3_RI (1<<8) /* Ring indicator */
126 #define UCR3_TIMEOUTEN (1<<7) /* Timeout interrupt enable */
127 #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
128 #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
129 #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
130 #ifdef CONFIG_ARCH_MX1
131 #define UCR3_REF25 (1<<3) /* Ref freq 25 MHz, only on mx1 */
132 #define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz, only on mx1 */
134 #if defined CONFIG_ARCH_MX2 || defined CONFIG_ARCH_MX3
135 #define UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select, on mx2/mx3 */
137 #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
138 #define UCR3_BPEN (1<<0) /* Preset registers enable */
139 #define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
140 #define UCR4_INVR (1<<9) /* Inverted infrared reception */
141 #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
142 #define UCR4_WKEN (1<<7) /* Wake interrupt enable */
143 #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
144 #define UCR4_IRSC (1<<5) /* IR special case */
145 #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
146 #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
147 #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
148 #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
149 #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
150 #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
151 #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
152 #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
153 #define USR1_RTSS (1<<14) /* RTS pin status */
154 #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
155 #define USR1_RTSD (1<<12) /* RTS delta */
156 #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
157 #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
158 #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
159 #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
160 #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
161 #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
162 #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
163 #define USR2_ADET (1<<15) /* Auto baud rate detect complete */
164 #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
165 #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
166 #define USR2_IDLE (1<<12) /* Idle condition */
167 #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
168 #define USR2_WAKE (1<<7) /* Wake */
169 #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
170 #define USR2_TXDC (1<<3) /* Transmitter complete */
171 #define USR2_BRCD (1<<2) /* Break condition */
172 #define USR2_ORE (1<<1) /* Overrun error */
173 #define USR2_RDR (1<<0) /* Recv data ready */
174 #define UTS_FRCPERR (1<<13) /* Force parity error */
175 #define UTS_LOOP (1<<12) /* Loop tx and rx */
176 #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
177 #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
178 #define UTS_TXFULL (1<<4) /* TxFIFO full */
179 #define UTS_RXFULL (1<<3) /* RxFIFO full */
180 #define UTS_SOFTRST (1<<0) /* Software reset */
182 /* We've been assigned a range on the "Low-density serial ports" major */
183 #ifdef CONFIG_ARCH_MXC
184 #define SERIAL_IMX_MAJOR 207
185 #define MINOR_START 16
186 #define DEV_NAME "ttymxc"
187 #define MAX_INTERNAL_IRQ MXC_INTERNAL_IRQS
191 * This determines how often we check the modem status signals
192 * for any change. They generally aren't connected to an IRQ
193 * so we have to poll them. We also check immediately before
194 * filling the TX fifo incase CTS has been dropped.
196 #define MCTRL_TIMEOUT (250*HZ/1000)
198 #define DRIVER_NAME "IMX-uart"
203 struct uart_port port;
204 struct timer_list timer;
205 unsigned int old_status;
206 int txirq,rxirq,rtsirq;
212 * Handle any change of modem status signal since we were last called.
214 static void imx_mctrl_check(struct imx_port *sport)
216 unsigned int status, changed;
218 status = sport->port.ops->get_mctrl(&sport->port);
219 changed = status ^ sport->old_status;
224 sport->old_status = status;
226 if (changed & TIOCM_RI)
227 sport->port.icount.rng++;
228 if (changed & TIOCM_DSR)
229 sport->port.icount.dsr++;
230 if (changed & TIOCM_CAR)
231 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
232 if (changed & TIOCM_CTS)
233 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
235 wake_up_interruptible(&sport->port.info->delta_msr_wait);
239 * This is our per-port timeout handler, for checking the
240 * modem status signals.
242 static void imx_timeout(unsigned long data)
244 struct imx_port *sport = (struct imx_port *)data;
247 if (sport->port.info) {
248 spin_lock_irqsave(&sport->port.lock, flags);
249 imx_mctrl_check(sport);
250 spin_unlock_irqrestore(&sport->port.lock, flags);
252 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
257 * interrupts disabled on entry
259 static void imx_stop_tx(struct uart_port *port)
261 struct imx_port *sport = (struct imx_port *)port;
264 temp = readl(sport->port.membase + UCR1);
265 writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
269 * interrupts disabled on entry
271 static void imx_stop_rx(struct uart_port *port)
273 struct imx_port *sport = (struct imx_port *)port;
276 temp = readl(sport->port.membase + UCR2);
277 writel(temp &~ UCR2_RXEN, sport->port.membase + UCR2);
281 * Set the modem control timer to fire immediately.
283 static void imx_enable_ms(struct uart_port *port)
285 struct imx_port *sport = (struct imx_port *)port;
287 mod_timer(&sport->timer, jiffies);
290 static inline void imx_transmit_buffer(struct imx_port *sport)
292 struct circ_buf *xmit = &sport->port.info->xmit;
294 while (!(readl(sport->port.membase + UTS) & UTS_TXFULL)) {
295 /* send xmit->buf[xmit->tail]
296 * out the port here */
297 writel(xmit->buf[xmit->tail], sport->port.membase + URTX0);
298 xmit->tail = (xmit->tail + 1) &
299 (UART_XMIT_SIZE - 1);
300 sport->port.icount.tx++;
301 if (uart_circ_empty(xmit))
305 if (uart_circ_empty(xmit))
306 imx_stop_tx(&sport->port);
310 * interrupts disabled on entry
312 static void imx_start_tx(struct uart_port *port)
314 struct imx_port *sport = (struct imx_port *)port;
317 temp = readl(sport->port.membase + UCR1);
318 writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
320 if (readl(sport->port.membase + UTS) & UTS_TXEMPTY)
321 imx_transmit_buffer(sport);
324 static irqreturn_t imx_rtsint(int irq, void *dev_id)
326 struct imx_port *sport = dev_id;
327 unsigned int val = readl(sport->port.membase + USR1) & USR1_RTSS;
330 spin_lock_irqsave(&sport->port.lock, flags);
332 writel(USR1_RTSD, sport->port.membase + USR1);
333 uart_handle_cts_change(&sport->port, !!val);
334 wake_up_interruptible(&sport->port.info->delta_msr_wait);
336 spin_unlock_irqrestore(&sport->port.lock, flags);
340 static irqreturn_t imx_txint(int irq, void *dev_id)
342 struct imx_port *sport = dev_id;
343 struct circ_buf *xmit = &sport->port.info->xmit;
346 spin_lock_irqsave(&sport->port.lock,flags);
347 if (sport->port.x_char)
350 writel(sport->port.x_char, sport->port.membase + URTX0);
354 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
355 imx_stop_tx(&sport->port);
359 imx_transmit_buffer(sport);
361 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
362 uart_write_wakeup(&sport->port);
365 spin_unlock_irqrestore(&sport->port.lock,flags);
369 static irqreturn_t imx_rxint(int irq, void *dev_id)
371 struct imx_port *sport = dev_id;
372 unsigned int rx,flg,ignored = 0;
373 struct tty_struct *tty = sport->port.info->port.tty;
374 unsigned long flags, temp;
376 spin_lock_irqsave(&sport->port.lock,flags);
378 while (readl(sport->port.membase + USR2) & USR2_RDR) {
380 sport->port.icount.rx++;
382 rx = readl(sport->port.membase + URXD0);
384 temp = readl(sport->port.membase + USR2);
385 if (temp & USR2_BRCD) {
386 writel(temp | USR2_BRCD, sport->port.membase + USR2);
387 if (uart_handle_break(&sport->port))
391 if (uart_handle_sysrq_char
392 (&sport->port, (unsigned char)rx))
395 if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) {
397 sport->port.icount.parity++;
398 else if (rx & URXD_FRMERR)
399 sport->port.icount.frame++;
400 if (rx & URXD_OVRRUN)
401 sport->port.icount.overrun++;
403 if (rx & sport->port.ignore_status_mask) {
409 rx &= sport->port.read_status_mask;
413 else if (rx & URXD_FRMERR)
415 if (rx & URXD_OVRRUN)
419 sport->port.sysrq = 0;
423 tty_insert_flip_char(tty, rx, flg);
427 spin_unlock_irqrestore(&sport->port.lock,flags);
428 tty_flip_buffer_push(tty);
432 static irqreturn_t imx_int(int irq, void *dev_id)
434 struct imx_port *sport = dev_id;
437 sts = readl(sport->port.membase + USR1);
440 imx_rxint(irq, dev_id);
442 if (sts & USR1_TRDY &&
443 readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN)
444 imx_txint(irq, dev_id);
447 imx_rtsint(irq, dev_id);
453 * Return TIOCSER_TEMT when transmitter is not busy.
455 static unsigned int imx_tx_empty(struct uart_port *port)
457 struct imx_port *sport = (struct imx_port *)port;
459 return (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0;
463 * We have a modem side uart, so the meanings of RTS and CTS are inverted.
465 static unsigned int imx_get_mctrl(struct uart_port *port)
467 struct imx_port *sport = (struct imx_port *)port;
468 unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
470 if (readl(sport->port.membase + USR1) & USR1_RTSS)
473 if (readl(sport->port.membase + UCR2) & UCR2_CTS)
479 static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
481 struct imx_port *sport = (struct imx_port *)port;
484 temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
486 if (mctrl & TIOCM_RTS)
489 writel(temp, sport->port.membase + UCR2);
493 * Interrupts always disabled.
495 static void imx_break_ctl(struct uart_port *port, int break_state)
497 struct imx_port *sport = (struct imx_port *)port;
498 unsigned long flags, temp;
500 spin_lock_irqsave(&sport->port.lock, flags);
502 temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK;
504 if ( break_state != 0 )
507 writel(temp, sport->port.membase + UCR1);
509 spin_unlock_irqrestore(&sport->port.lock, flags);
512 #define TXTL 2 /* reset default */
513 #define RXTL 1 /* reset default */
515 static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
518 unsigned int ufcr_rfdiv;
520 /* set receiver / transmitter trigger level.
521 * RFDIV is set such way to satisfy requested uartclk value
523 val = TXTL << 10 | RXTL;
524 ufcr_rfdiv = (clk_get_rate(sport->clk) + sport->port.uartclk / 2)
525 / sport->port.uartclk;
533 ufcr_rfdiv = 6 - ufcr_rfdiv;
535 val |= UFCR_RFDIV & (ufcr_rfdiv << 7);
537 writel(val, sport->port.membase + UFCR);
542 static int imx_startup(struct uart_port *port)
544 struct imx_port *sport = (struct imx_port *)port;
546 unsigned long flags, temp;
548 imx_setup_ufcr(sport, 0);
550 /* disable the DREN bit (Data Ready interrupt enable) before
553 temp = readl(sport->port.membase + UCR4);
554 writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
557 * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
558 * chips only have one interrupt.
560 if (sport->txirq > 0) {
561 retval = request_irq(sport->rxirq, imx_rxint, 0,
566 retval = request_irq(sport->txirq, imx_txint, 0,
571 retval = request_irq(sport->rtsirq, imx_rtsint,
572 (sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
573 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
578 retval = request_irq(sport->port.irq, imx_int, 0,
581 free_irq(sport->port.irq, sport);
587 * Finally, clear and enable interrupts
589 writel(USR1_RTSD, sport->port.membase + USR1);
591 temp = readl(sport->port.membase + UCR1);
592 temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
593 writel(temp, sport->port.membase + UCR1);
595 temp = readl(sport->port.membase + UCR2);
596 temp |= (UCR2_RXEN | UCR2_TXEN);
597 writel(temp, sport->port.membase + UCR2);
599 #if defined CONFIG_ARCH_MX2 || defined CONFIG_ARCH_MX3
600 temp = readl(sport->port.membase + UCR3);
601 temp |= UCR3_RXDMUXSEL;
602 writel(temp, sport->port.membase + UCR3);
606 * Enable modem status interrupts
608 spin_lock_irqsave(&sport->port.lock,flags);
609 imx_enable_ms(&sport->port);
610 spin_unlock_irqrestore(&sport->port.lock,flags);
616 free_irq(sport->txirq, sport);
619 free_irq(sport->rxirq, sport);
624 static void imx_shutdown(struct uart_port *port)
626 struct imx_port *sport = (struct imx_port *)port;
632 del_timer_sync(&sport->timer);
635 * Free the interrupts
637 if (sport->txirq > 0) {
638 free_irq(sport->rtsirq, sport);
639 free_irq(sport->txirq, sport);
640 free_irq(sport->rxirq, sport);
642 free_irq(sport->port.irq, sport);
645 * Disable all interrupts, port and break condition.
648 temp = readl(sport->port.membase + UCR1);
649 temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
650 writel(temp, sport->port.membase + UCR1);
654 imx_set_termios(struct uart_port *port, struct ktermios *termios,
655 struct ktermios *old)
657 struct imx_port *sport = (struct imx_port *)port;
659 unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
660 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
661 unsigned int div, num, denom, ufcr;
664 * If we don't support modem control lines, don't allow
668 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
669 termios->c_cflag |= CLOCAL;
673 * We only support CS7 and CS8.
675 while ((termios->c_cflag & CSIZE) != CS7 &&
676 (termios->c_cflag & CSIZE) != CS8) {
677 termios->c_cflag &= ~CSIZE;
678 termios->c_cflag |= old_csize;
682 if ((termios->c_cflag & CSIZE) == CS8)
683 ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
685 ucr2 = UCR2_SRST | UCR2_IRTS;
687 if (termios->c_cflag & CRTSCTS) {
688 if( sport->have_rtscts ) {
692 termios->c_cflag &= ~CRTSCTS;
696 if (termios->c_cflag & CSTOPB)
698 if (termios->c_cflag & PARENB) {
700 if (termios->c_cflag & PARODD)
705 * Ask the core to calculate the divisor for us.
707 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
708 quot = uart_get_divisor(port, baud);
710 spin_lock_irqsave(&sport->port.lock, flags);
712 sport->port.read_status_mask = 0;
713 if (termios->c_iflag & INPCK)
714 sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
715 if (termios->c_iflag & (BRKINT | PARMRK))
716 sport->port.read_status_mask |= URXD_BRK;
719 * Characters to ignore
721 sport->port.ignore_status_mask = 0;
722 if (termios->c_iflag & IGNPAR)
723 sport->port.ignore_status_mask |= URXD_PRERR;
724 if (termios->c_iflag & IGNBRK) {
725 sport->port.ignore_status_mask |= URXD_BRK;
727 * If we're ignoring parity and break indicators,
728 * ignore overruns too (for real raw support).
730 if (termios->c_iflag & IGNPAR)
731 sport->port.ignore_status_mask |= URXD_OVRRUN;
734 del_timer_sync(&sport->timer);
737 * Update the per-port timeout.
739 uart_update_timeout(port, termios->c_cflag, baud);
742 * disable interrupts and drain transmitter
744 old_ucr1 = readl(sport->port.membase + UCR1);
745 writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
746 sport->port.membase + UCR1);
748 while ( !(readl(sport->port.membase + USR2) & USR2_TXDC))
751 /* then, disable everything */
752 old_txrxen = readl(sport->port.membase + UCR2);
753 writel(old_txrxen & ~( UCR2_TXEN | UCR2_RXEN),
754 sport->port.membase + UCR2);
755 old_txrxen &= (UCR2_TXEN | UCR2_RXEN);
757 div = sport->port.uartclk / (baud * 16);
764 denom = port->uartclk / div / 16;
766 /* shift num and denom right until they fit into 16 bits */
767 while (num > 0x10000 || denom > 0x10000) {
776 writel(num, sport->port.membase + UBIR);
777 writel(denom, sport->port.membase + UBMR);
780 div = 6; /* 6 in RFDIV means divide by 7 */
784 ufcr = readl(sport->port.membase + UFCR);
785 ufcr = (ufcr & (~UFCR_RFDIV)) |
787 writel(ufcr, sport->port.membase + UFCR);
790 writel(sport->port.uartclk / div / 1000, sport->port.membase + ONEMS);
793 writel(old_ucr1, sport->port.membase + UCR1);
795 /* set the parity, stop bits and data size */
796 writel(ucr2 | old_txrxen, sport->port.membase + UCR2);
798 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
799 imx_enable_ms(&sport->port);
801 spin_unlock_irqrestore(&sport->port.lock, flags);
804 static const char *imx_type(struct uart_port *port)
806 struct imx_port *sport = (struct imx_port *)port;
808 return sport->port.type == PORT_IMX ? "IMX" : NULL;
812 * Release the memory region(s) being used by 'port'.
814 static void imx_release_port(struct uart_port *port)
816 struct platform_device *pdev = to_platform_device(port->dev);
817 struct resource *mmres;
819 mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
820 release_mem_region(mmres->start, mmres->end - mmres->start + 1);
824 * Request the memory region(s) being used by 'port'.
826 static int imx_request_port(struct uart_port *port)
828 struct platform_device *pdev = to_platform_device(port->dev);
829 struct resource *mmres;
832 mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
836 ret = request_mem_region(mmres->start, mmres->end - mmres->start + 1,
839 return ret ? 0 : -EBUSY;
843 * Configure/autoconfigure the port.
845 static void imx_config_port(struct uart_port *port, int flags)
847 struct imx_port *sport = (struct imx_port *)port;
849 if (flags & UART_CONFIG_TYPE &&
850 imx_request_port(&sport->port) == 0)
851 sport->port.type = PORT_IMX;
855 * Verify the new serial_struct (for TIOCSSERIAL).
856 * The only change we allow are to the flags and type, and
857 * even then only between PORT_IMX and PORT_UNKNOWN
860 imx_verify_port(struct uart_port *port, struct serial_struct *ser)
862 struct imx_port *sport = (struct imx_port *)port;
865 if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
867 if (sport->port.irq != ser->irq)
869 if (ser->io_type != UPIO_MEM)
871 if (sport->port.uartclk / 16 != ser->baud_base)
873 if ((void *)sport->port.mapbase != ser->iomem_base)
875 if (sport->port.iobase != ser->port)
882 static struct uart_ops imx_pops = {
883 .tx_empty = imx_tx_empty,
884 .set_mctrl = imx_set_mctrl,
885 .get_mctrl = imx_get_mctrl,
886 .stop_tx = imx_stop_tx,
887 .start_tx = imx_start_tx,
888 .stop_rx = imx_stop_rx,
889 .enable_ms = imx_enable_ms,
890 .break_ctl = imx_break_ctl,
891 .startup = imx_startup,
892 .shutdown = imx_shutdown,
893 .set_termios = imx_set_termios,
895 .release_port = imx_release_port,
896 .request_port = imx_request_port,
897 .config_port = imx_config_port,
898 .verify_port = imx_verify_port,
901 static struct imx_port *imx_ports[UART_NR];
903 #ifdef CONFIG_SERIAL_IMX_CONSOLE
904 static void imx_console_putchar(struct uart_port *port, int ch)
906 struct imx_port *sport = (struct imx_port *)port;
908 while (readl(sport->port.membase + UTS) & UTS_TXFULL)
911 writel(ch, sport->port.membase + URTX0);
915 * Interrupts are disabled on entering
918 imx_console_write(struct console *co, const char *s, unsigned int count)
920 struct imx_port *sport = imx_ports[co->index];
921 unsigned int old_ucr1, old_ucr2;
924 * First, save UCR1/2 and then disable interrupts
926 old_ucr1 = readl(sport->port.membase + UCR1);
927 old_ucr2 = readl(sport->port.membase + UCR2);
929 writel((old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN) &
930 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
931 sport->port.membase + UCR1);
933 writel(old_ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
935 uart_console_write(&sport->port, s, count, imx_console_putchar);
938 * Finally, wait for transmitter to become empty
941 while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
943 writel(old_ucr1, sport->port.membase + UCR1);
944 writel(old_ucr2, sport->port.membase + UCR2);
948 * If the port was already initialised (eg, by a boot loader),
949 * try to determine the current setup.
952 imx_console_get_options(struct imx_port *sport, int *baud,
953 int *parity, int *bits)
956 if ( readl(sport->port.membase + UCR1) | UCR1_UARTEN ) {
957 /* ok, the port was enabled */
958 unsigned int ucr2, ubir,ubmr, uartclk;
959 unsigned int baud_raw;
960 unsigned int ucfr_rfdiv;
962 ucr2 = readl(sport->port.membase + UCR2);
965 if (ucr2 & UCR2_PREN) {
966 if (ucr2 & UCR2_PROE)
977 ubir = readl(sport->port.membase + UBIR) & 0xffff;
978 ubmr = readl(sport->port.membase + UBMR) & 0xffff;
980 ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7;
984 ucfr_rfdiv = 6 - ucfr_rfdiv;
986 uartclk = clk_get_rate(sport->clk);
987 uartclk /= ucfr_rfdiv;
990 * The next code provides exact computation of
991 * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
992 * without need of float support or long long division,
993 * which would be required to prevent 32bit arithmetic overflow
995 unsigned int mul = ubir + 1;
996 unsigned int div = 16 * (ubmr + 1);
997 unsigned int rem = uartclk % div;
999 baud_raw = (uartclk / div) * mul;
1000 baud_raw += (rem * mul + div / 2) / div;
1001 *baud = (baud_raw + 50) / 100 * 100;
1004 if(*baud != baud_raw)
1005 printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
1011 imx_console_setup(struct console *co, char *options)
1013 struct imx_port *sport;
1020 * Check whether an invalid uart number has been specified, and
1021 * if so, search for the first available port that does have
1024 if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
1026 sport = imx_ports[co->index];
1029 uart_parse_options(options, &baud, &parity, &bits, &flow);
1031 imx_console_get_options(sport, &baud, &parity, &bits);
1033 imx_setup_ufcr(sport, 0);
1035 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
1038 static struct uart_driver imx_reg;
1039 static struct console imx_console = {
1041 .write = imx_console_write,
1042 .device = uart_console_device,
1043 .setup = imx_console_setup,
1044 .flags = CON_PRINTBUFFER,
1049 #define IMX_CONSOLE &imx_console
1051 #define IMX_CONSOLE NULL
1054 static struct uart_driver imx_reg = {
1055 .owner = THIS_MODULE,
1056 .driver_name = DRIVER_NAME,
1057 .dev_name = DEV_NAME,
1058 .major = SERIAL_IMX_MAJOR,
1059 .minor = MINOR_START,
1060 .nr = ARRAY_SIZE(imx_ports),
1061 .cons = IMX_CONSOLE,
1064 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
1066 struct imx_port *sport = platform_get_drvdata(dev);
1069 uart_suspend_port(&imx_reg, &sport->port);
1074 static int serial_imx_resume(struct platform_device *dev)
1076 struct imx_port *sport = platform_get_drvdata(dev);
1079 uart_resume_port(&imx_reg, &sport->port);
1084 static int serial_imx_probe(struct platform_device *pdev)
1086 struct imx_port *sport;
1087 struct imxuart_platform_data *pdata;
1090 struct resource *res;
1092 sport = kzalloc(sizeof(*sport), GFP_KERNEL);
1096 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1102 base = ioremap(res->start, PAGE_SIZE);
1108 sport->port.dev = &pdev->dev;
1109 sport->port.mapbase = res->start;
1110 sport->port.membase = base;
1111 sport->port.type = PORT_IMX,
1112 sport->port.iotype = UPIO_MEM;
1113 sport->port.irq = platform_get_irq(pdev, 0);
1114 sport->rxirq = platform_get_irq(pdev, 0);
1115 sport->txirq = platform_get_irq(pdev, 1);
1116 sport->rtsirq = platform_get_irq(pdev, 2);
1117 sport->port.fifosize = 32;
1118 sport->port.ops = &imx_pops;
1119 sport->port.flags = UPF_BOOT_AUTOCONF;
1120 sport->port.line = pdev->id;
1121 init_timer(&sport->timer);
1122 sport->timer.function = imx_timeout;
1123 sport->timer.data = (unsigned long)sport;
1125 sport->clk = clk_get(&pdev->dev, "uart");
1126 if (IS_ERR(sport->clk)) {
1127 ret = PTR_ERR(sport->clk);
1130 clk_enable(sport->clk);
1132 sport->port.uartclk = clk_get_rate(sport->clk);
1134 imx_ports[pdev->id] = sport;
1136 pdata = pdev->dev.platform_data;
1137 if(pdata && (pdata->flags & IMXUART_HAVE_RTSCTS))
1138 sport->have_rtscts = 1;
1141 ret = pdata->init(pdev);
1146 uart_add_one_port(&imx_reg, &sport->port);
1147 platform_set_drvdata(pdev, &sport->port);
1151 clk_put(sport->clk);
1152 clk_disable(sport->clk);
1154 iounmap(sport->port.membase);
1161 static int serial_imx_remove(struct platform_device *pdev)
1163 struct imxuart_platform_data *pdata;
1164 struct imx_port *sport = platform_get_drvdata(pdev);
1166 pdata = pdev->dev.platform_data;
1168 platform_set_drvdata(pdev, NULL);
1171 uart_remove_one_port(&imx_reg, &sport->port);
1172 clk_put(sport->clk);
1175 clk_disable(sport->clk);
1180 iounmap(sport->port.membase);
1186 static struct platform_driver serial_imx_driver = {
1187 .probe = serial_imx_probe,
1188 .remove = serial_imx_remove,
1190 .suspend = serial_imx_suspend,
1191 .resume = serial_imx_resume,
1194 .owner = THIS_MODULE,
1198 static int __init imx_serial_init(void)
1202 printk(KERN_INFO "Serial: IMX driver\n");
1204 ret = uart_register_driver(&imx_reg);
1208 ret = platform_driver_register(&serial_imx_driver);
1210 uart_unregister_driver(&imx_reg);
1215 static void __exit imx_serial_exit(void)
1217 platform_driver_unregister(&serial_imx_driver);
1218 uart_unregister_driver(&imx_reg);
1221 module_init(imx_serial_init);
1222 module_exit(imx_serial_exit);
1224 MODULE_AUTHOR("Sascha Hauer");
1225 MODULE_DESCRIPTION("IMX generic serial port driver");
1226 MODULE_LICENSE("GPL");
1227 MODULE_ALIAS("platform:imx-uart");