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 * Copyright (C) 2009 emlix GmbH
12 * Author: Fabian Godehardt (added IrDA support for iMX)
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * [29-Mar-2005] Mike Lee
29 * Added hardware handshake
32 #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
36 #include <linux/module.h>
37 #include <linux/ioport.h>
38 #include <linux/init.h>
39 #include <linux/console.h>
40 #include <linux/sysrq.h>
41 #include <linux/platform_device.h>
42 #include <linux/tty.h>
43 #include <linux/tty_flip.h>
44 #include <linux/serial_core.h>
45 #include <linux/serial.h>
46 #include <linux/clk.h>
47 #include <linux/delay.h>
48 #include <linux/rational.h>
52 #include <mach/hardware.h>
53 #include <mach/imx-uart.h>
55 /* Register definitions */
56 #define URXD0 0x0 /* Receiver Register */
57 #define URTX0 0x40 /* Transmitter Register */
58 #define UCR1 0x80 /* Control Register 1 */
59 #define UCR2 0x84 /* Control Register 2 */
60 #define UCR3 0x88 /* Control Register 3 */
61 #define UCR4 0x8c /* Control Register 4 */
62 #define UFCR 0x90 /* FIFO Control Register */
63 #define USR1 0x94 /* Status Register 1 */
64 #define USR2 0x98 /* Status Register 2 */
65 #define UESC 0x9c /* Escape Character Register */
66 #define UTIM 0xa0 /* Escape Timer Register */
67 #define UBIR 0xa4 /* BRM Incremental Register */
68 #define UBMR 0xa8 /* BRM Modulator Register */
69 #define UBRC 0xac /* Baud Rate Count Register */
70 #if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX2
71 #define ONEMS 0xb0 /* One Millisecond register */
72 #define UTS 0xb4 /* UART Test Register */
74 #if defined(CONFIG_ARCH_IMX) || defined(CONFIG_ARCH_MX1)
75 #define BIPR1 0xb0 /* Incremental Preset Register 1 */
76 #define BIPR2 0xb4 /* Incremental Preset Register 2 */
77 #define BIPR3 0xb8 /* Incremental Preset Register 3 */
78 #define BIPR4 0xbc /* Incremental Preset Register 4 */
79 #define BMPR1 0xc0 /* BRM Modulator Register 1 */
80 #define BMPR2 0xc4 /* BRM Modulator Register 2 */
81 #define BMPR3 0xc8 /* BRM Modulator Register 3 */
82 #define BMPR4 0xcc /* BRM Modulator Register 4 */
83 #define UTS 0xd0 /* UART Test Register */
86 /* UART Control Register Bit Fields.*/
87 #define URXD_CHARRDY (1<<15)
88 #define URXD_ERR (1<<14)
89 #define URXD_OVRRUN (1<<13)
90 #define URXD_FRMERR (1<<12)
91 #define URXD_BRK (1<<11)
92 #define URXD_PRERR (1<<10)
93 #define UCR1_ADEN (1<<15) /* Auto dectect interrupt */
94 #define UCR1_ADBR (1<<14) /* Auto detect baud rate */
95 #define UCR1_TRDYEN (1<<13) /* Transmitter ready interrupt enable */
96 #define UCR1_IDEN (1<<12) /* Idle condition interrupt */
97 #define UCR1_RRDYEN (1<<9) /* Recv ready interrupt enable */
98 #define UCR1_RDMAEN (1<<8) /* Recv ready DMA enable */
99 #define UCR1_IREN (1<<7) /* Infrared interface enable */
100 #define UCR1_TXMPTYEN (1<<6) /* Transimitter empty interrupt enable */
101 #define UCR1_RTSDEN (1<<5) /* RTS delta interrupt enable */
102 #define UCR1_SNDBRK (1<<4) /* Send break */
103 #define UCR1_TDMAEN (1<<3) /* Transmitter ready DMA enable */
104 #if defined(CONFIG_ARCH_IMX) || defined(CONFIG_ARCH_MX1)
105 #define UCR1_UARTCLKEN (1<<2) /* UART clock enabled */
107 #if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX2
108 #define UCR1_UARTCLKEN (0) /* not present on mx2/mx3 */
110 #define UCR1_DOZE (1<<1) /* Doze */
111 #define UCR1_UARTEN (1<<0) /* UART enabled */
112 #define UCR2_ESCI (1<<15) /* Escape seq interrupt enable */
113 #define UCR2_IRTS (1<<14) /* Ignore RTS pin */
114 #define UCR2_CTSC (1<<13) /* CTS pin control */
115 #define UCR2_CTS (1<<12) /* Clear to send */
116 #define UCR2_ESCEN (1<<11) /* Escape enable */
117 #define UCR2_PREN (1<<8) /* Parity enable */
118 #define UCR2_PROE (1<<7) /* Parity odd/even */
119 #define UCR2_STPB (1<<6) /* Stop */
120 #define UCR2_WS (1<<5) /* Word size */
121 #define UCR2_RTSEN (1<<4) /* Request to send interrupt enable */
122 #define UCR2_TXEN (1<<2) /* Transmitter enabled */
123 #define UCR2_RXEN (1<<1) /* Receiver enabled */
124 #define UCR2_SRST (1<<0) /* SW reset */
125 #define UCR3_DTREN (1<<13) /* DTR interrupt enable */
126 #define UCR3_PARERREN (1<<12) /* Parity enable */
127 #define UCR3_FRAERREN (1<<11) /* Frame error interrupt enable */
128 #define UCR3_DSR (1<<10) /* Data set ready */
129 #define UCR3_DCD (1<<9) /* Data carrier detect */
130 #define UCR3_RI (1<<8) /* Ring indicator */
131 #define UCR3_TIMEOUTEN (1<<7) /* Timeout interrupt enable */
132 #define UCR3_RXDSEN (1<<6) /* Receive status interrupt enable */
133 #define UCR3_AIRINTEN (1<<5) /* Async IR wake interrupt enable */
134 #define UCR3_AWAKEN (1<<4) /* Async wake interrupt enable */
135 #ifdef CONFIG_ARCH_IMX
136 #define UCR3_REF25 (1<<3) /* Ref freq 25 MHz, only on mx1 */
137 #define UCR3_REF30 (1<<2) /* Ref Freq 30 MHz, only on mx1 */
139 #if defined CONFIG_ARCH_MX2 || defined CONFIG_ARCH_MX3
140 #define UCR3_RXDMUXSEL (1<<2) /* RXD Muxed Input Select, on mx2/mx3 */
142 #define UCR3_INVT (1<<1) /* Inverted Infrared transmission */
143 #define UCR3_BPEN (1<<0) /* Preset registers enable */
144 #define UCR4_CTSTL_32 (32<<10) /* CTS trigger level (32 chars) */
145 #define UCR4_INVR (1<<9) /* Inverted infrared reception */
146 #define UCR4_ENIRI (1<<8) /* Serial infrared interrupt enable */
147 #define UCR4_WKEN (1<<7) /* Wake interrupt enable */
148 #define UCR4_REF16 (1<<6) /* Ref freq 16 MHz */
149 #define UCR4_IRSC (1<<5) /* IR special case */
150 #define UCR4_TCEN (1<<3) /* Transmit complete interrupt enable */
151 #define UCR4_BKEN (1<<2) /* Break condition interrupt enable */
152 #define UCR4_OREN (1<<1) /* Receiver overrun interrupt enable */
153 #define UCR4_DREN (1<<0) /* Recv data ready interrupt enable */
154 #define UFCR_RXTL_SHF 0 /* Receiver trigger level shift */
155 #define UFCR_RFDIV (7<<7) /* Reference freq divider mask */
156 #define UFCR_RFDIV_REG(x) (((x) < 7 ? 6 - (x) : 6) << 7)
157 #define UFCR_TXTL_SHF 10 /* Transmitter trigger level shift */
158 #define USR1_PARITYERR (1<<15) /* Parity error interrupt flag */
159 #define USR1_RTSS (1<<14) /* RTS pin status */
160 #define USR1_TRDY (1<<13) /* Transmitter ready interrupt/dma flag */
161 #define USR1_RTSD (1<<12) /* RTS delta */
162 #define USR1_ESCF (1<<11) /* Escape seq interrupt flag */
163 #define USR1_FRAMERR (1<<10) /* Frame error interrupt flag */
164 #define USR1_RRDY (1<<9) /* Receiver ready interrupt/dma flag */
165 #define USR1_TIMEOUT (1<<7) /* Receive timeout interrupt status */
166 #define USR1_RXDS (1<<6) /* Receiver idle interrupt flag */
167 #define USR1_AIRINT (1<<5) /* Async IR wake interrupt flag */
168 #define USR1_AWAKE (1<<4) /* Aysnc wake interrupt flag */
169 #define USR2_ADET (1<<15) /* Auto baud rate detect complete */
170 #define USR2_TXFE (1<<14) /* Transmit buffer FIFO empty */
171 #define USR2_DTRF (1<<13) /* DTR edge interrupt flag */
172 #define USR2_IDLE (1<<12) /* Idle condition */
173 #define USR2_IRINT (1<<8) /* Serial infrared interrupt flag */
174 #define USR2_WAKE (1<<7) /* Wake */
175 #define USR2_RTSF (1<<4) /* RTS edge interrupt flag */
176 #define USR2_TXDC (1<<3) /* Transmitter complete */
177 #define USR2_BRCD (1<<2) /* Break condition */
178 #define USR2_ORE (1<<1) /* Overrun error */
179 #define USR2_RDR (1<<0) /* Recv data ready */
180 #define UTS_FRCPERR (1<<13) /* Force parity error */
181 #define UTS_LOOP (1<<12) /* Loop tx and rx */
182 #define UTS_TXEMPTY (1<<6) /* TxFIFO empty */
183 #define UTS_RXEMPTY (1<<5) /* RxFIFO empty */
184 #define UTS_TXFULL (1<<4) /* TxFIFO full */
185 #define UTS_RXFULL (1<<3) /* RxFIFO full */
186 #define UTS_SOFTRST (1<<0) /* Software reset */
188 /* We've been assigned a range on the "Low-density serial ports" major */
189 #ifdef CONFIG_ARCH_IMX
190 #define SERIAL_IMX_MAJOR 204
191 #define MINOR_START 41
192 #define DEV_NAME "ttySMX"
193 #define MAX_INTERNAL_IRQ IMX_IRQS
196 #ifdef CONFIG_ARCH_MXC
197 #define SERIAL_IMX_MAJOR 207
198 #define MINOR_START 16
199 #define DEV_NAME "ttymxc"
200 #define MAX_INTERNAL_IRQ MXC_INTERNAL_IRQS
204 * This determines how often we check the modem status signals
205 * for any change. They generally aren't connected to an IRQ
206 * so we have to poll them. We also check immediately before
207 * filling the TX fifo incase CTS has been dropped.
209 #define MCTRL_TIMEOUT (250*HZ/1000)
211 #define DRIVER_NAME "IMX-uart"
216 struct uart_port port;
217 struct timer_list timer;
218 unsigned int old_status;
219 int txirq,rxirq,rtsirq;
220 unsigned int have_rtscts:1;
221 unsigned int use_irda:1;
222 unsigned int irda_inv_rx:1;
223 unsigned int irda_inv_tx:1;
224 unsigned short trcv_delay; /* transceiver delay */
229 #define USE_IRDA(sport) ((sport)->use_irda)
231 #define USE_IRDA(sport) (0)
235 * Handle any change of modem status signal since we were last called.
237 static void imx_mctrl_check(struct imx_port *sport)
239 unsigned int status, changed;
241 status = sport->port.ops->get_mctrl(&sport->port);
242 changed = status ^ sport->old_status;
247 sport->old_status = status;
249 if (changed & TIOCM_RI)
250 sport->port.icount.rng++;
251 if (changed & TIOCM_DSR)
252 sport->port.icount.dsr++;
253 if (changed & TIOCM_CAR)
254 uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
255 if (changed & TIOCM_CTS)
256 uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
258 wake_up_interruptible(&sport->port.info->delta_msr_wait);
262 * This is our per-port timeout handler, for checking the
263 * modem status signals.
265 static void imx_timeout(unsigned long data)
267 struct imx_port *sport = (struct imx_port *)data;
270 if (sport->port.info) {
271 spin_lock_irqsave(&sport->port.lock, flags);
272 imx_mctrl_check(sport);
273 spin_unlock_irqrestore(&sport->port.lock, flags);
275 mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
280 * interrupts disabled on entry
282 static void imx_stop_tx(struct uart_port *port)
284 struct imx_port *sport = (struct imx_port *)port;
287 if (USE_IRDA(sport)) {
288 /* half duplex - wait for end of transmission */
291 !(readl(sport->port.membase + USR2) & USR2_TXDC)) {
296 * irda transceiver - wait a bit more to avoid
297 * cutoff, hardware dependent
299 udelay(sport->trcv_delay);
302 * half duplex - reactivate receive mode,
303 * flush receive pipe echo crap
305 if (readl(sport->port.membase + USR2) & USR2_TXDC) {
306 temp = readl(sport->port.membase + UCR1);
307 temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN);
308 writel(temp, sport->port.membase + UCR1);
310 temp = readl(sport->port.membase + UCR4);
311 temp &= ~(UCR4_TCEN);
312 writel(temp, sport->port.membase + UCR4);
314 while (readl(sport->port.membase + URXD0) &
318 temp = readl(sport->port.membase + UCR1);
320 writel(temp, sport->port.membase + UCR1);
322 temp = readl(sport->port.membase + UCR4);
324 writel(temp, sport->port.membase + UCR4);
329 temp = readl(sport->port.membase + UCR1);
330 writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1);
334 * interrupts disabled on entry
336 static void imx_stop_rx(struct uart_port *port)
338 struct imx_port *sport = (struct imx_port *)port;
341 temp = readl(sport->port.membase + UCR2);
342 writel(temp &~ UCR2_RXEN, sport->port.membase + UCR2);
346 * Set the modem control timer to fire immediately.
348 static void imx_enable_ms(struct uart_port *port)
350 struct imx_port *sport = (struct imx_port *)port;
352 mod_timer(&sport->timer, jiffies);
355 static inline void imx_transmit_buffer(struct imx_port *sport)
357 struct circ_buf *xmit = &sport->port.info->xmit;
359 while (!(readl(sport->port.membase + UTS) & UTS_TXFULL)) {
360 /* send xmit->buf[xmit->tail]
361 * out the port here */
362 writel(xmit->buf[xmit->tail], sport->port.membase + URTX0);
363 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
364 sport->port.icount.tx++;
365 if (uart_circ_empty(xmit))
369 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
370 uart_write_wakeup(&sport->port);
372 if (uart_circ_empty(xmit))
373 imx_stop_tx(&sport->port);
377 * interrupts disabled on entry
379 static void imx_start_tx(struct uart_port *port)
381 struct imx_port *sport = (struct imx_port *)port;
384 if (USE_IRDA(sport)) {
385 /* half duplex in IrDA mode; have to disable receive mode */
386 temp = readl(sport->port.membase + UCR4);
387 temp &= ~(UCR4_DREN);
388 writel(temp, sport->port.membase + UCR4);
390 temp = readl(sport->port.membase + UCR1);
391 temp &= ~(UCR1_RRDYEN);
392 writel(temp, sport->port.membase + UCR1);
395 temp = readl(sport->port.membase + UCR1);
396 writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1);
398 if (USE_IRDA(sport)) {
399 temp = readl(sport->port.membase + UCR1);
401 writel(temp, sport->port.membase + UCR1);
403 temp = readl(sport->port.membase + UCR4);
405 writel(temp, sport->port.membase + UCR4);
408 if (readl(sport->port.membase + UTS) & UTS_TXEMPTY)
409 imx_transmit_buffer(sport);
412 static irqreturn_t imx_rtsint(int irq, void *dev_id)
414 struct imx_port *sport = dev_id;
415 unsigned int val = readl(sport->port.membase + USR1) & USR1_RTSS;
418 spin_lock_irqsave(&sport->port.lock, flags);
420 writel(USR1_RTSD, sport->port.membase + USR1);
421 uart_handle_cts_change(&sport->port, !!val);
422 wake_up_interruptible(&sport->port.info->delta_msr_wait);
424 spin_unlock_irqrestore(&sport->port.lock, flags);
428 static irqreturn_t imx_txint(int irq, void *dev_id)
430 struct imx_port *sport = dev_id;
431 struct circ_buf *xmit = &sport->port.info->xmit;
434 spin_lock_irqsave(&sport->port.lock,flags);
435 if (sport->port.x_char)
438 writel(sport->port.x_char, sport->port.membase + URTX0);
442 if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
443 imx_stop_tx(&sport->port);
447 imx_transmit_buffer(sport);
449 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
450 uart_write_wakeup(&sport->port);
453 spin_unlock_irqrestore(&sport->port.lock,flags);
457 static irqreturn_t imx_rxint(int irq, void *dev_id)
459 struct imx_port *sport = dev_id;
460 unsigned int rx,flg,ignored = 0;
461 struct tty_struct *tty = sport->port.info->port.tty;
462 unsigned long flags, temp;
464 spin_lock_irqsave(&sport->port.lock,flags);
466 while (readl(sport->port.membase + USR2) & USR2_RDR) {
468 sport->port.icount.rx++;
470 rx = readl(sport->port.membase + URXD0);
472 temp = readl(sport->port.membase + USR2);
473 if (temp & USR2_BRCD) {
474 writel(temp | USR2_BRCD, sport->port.membase + USR2);
475 if (uart_handle_break(&sport->port))
479 if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
482 if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) {
484 sport->port.icount.parity++;
485 else if (rx & URXD_FRMERR)
486 sport->port.icount.frame++;
487 if (rx & URXD_OVRRUN)
488 sport->port.icount.overrun++;
490 if (rx & sport->port.ignore_status_mask) {
496 rx &= sport->port.read_status_mask;
500 else if (rx & URXD_FRMERR)
502 if (rx & URXD_OVRRUN)
506 sport->port.sysrq = 0;
510 tty_insert_flip_char(tty, rx, flg);
514 spin_unlock_irqrestore(&sport->port.lock,flags);
515 tty_flip_buffer_push(tty);
519 static irqreturn_t imx_int(int irq, void *dev_id)
521 struct imx_port *sport = dev_id;
524 sts = readl(sport->port.membase + USR1);
527 imx_rxint(irq, dev_id);
529 if (sts & USR1_TRDY &&
530 readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN)
531 imx_txint(irq, dev_id);
534 imx_rtsint(irq, dev_id);
540 * Return TIOCSER_TEMT when transmitter is not busy.
542 static unsigned int imx_tx_empty(struct uart_port *port)
544 struct imx_port *sport = (struct imx_port *)port;
546 return (readl(sport->port.membase + USR2) & USR2_TXDC) ? TIOCSER_TEMT : 0;
550 * We have a modem side uart, so the meanings of RTS and CTS are inverted.
552 static unsigned int imx_get_mctrl(struct uart_port *port)
554 struct imx_port *sport = (struct imx_port *)port;
555 unsigned int tmp = TIOCM_DSR | TIOCM_CAR;
557 if (readl(sport->port.membase + USR1) & USR1_RTSS)
560 if (readl(sport->port.membase + UCR2) & UCR2_CTS)
566 static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
568 struct imx_port *sport = (struct imx_port *)port;
571 temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;
573 if (mctrl & TIOCM_RTS)
576 writel(temp, sport->port.membase + UCR2);
580 * Interrupts always disabled.
582 static void imx_break_ctl(struct uart_port *port, int break_state)
584 struct imx_port *sport = (struct imx_port *)port;
585 unsigned long flags, temp;
587 spin_lock_irqsave(&sport->port.lock, flags);
589 temp = readl(sport->port.membase + UCR1) & ~UCR1_SNDBRK;
591 if ( break_state != 0 )
594 writel(temp, sport->port.membase + UCR1);
596 spin_unlock_irqrestore(&sport->port.lock, flags);
599 #define TXTL 2 /* reset default */
600 #define RXTL 1 /* reset default */
602 static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
605 unsigned int ufcr_rfdiv;
607 /* set receiver / transmitter trigger level.
608 * RFDIV is set such way to satisfy requested uartclk value
610 val = TXTL << 10 | RXTL;
611 ufcr_rfdiv = (clk_get_rate(sport->clk) + sport->port.uartclk / 2)
612 / sport->port.uartclk;
617 val |= UFCR_RFDIV_REG(ufcr_rfdiv);
619 writel(val, sport->port.membase + UFCR);
624 static int imx_startup(struct uart_port *port)
626 struct imx_port *sport = (struct imx_port *)port;
628 unsigned long flags, temp;
630 imx_setup_ufcr(sport, 0);
632 /* disable the DREN bit (Data Ready interrupt enable) before
635 temp = readl(sport->port.membase + UCR4);
640 writel(temp & ~UCR4_DREN, sport->port.membase + UCR4);
642 if (USE_IRDA(sport)) {
643 /* reset fifo's and state machines */
645 temp = readl(sport->port.membase + UCR2);
647 writel(temp, sport->port.membase + UCR2);
648 while (!(readl(sport->port.membase + UCR2) & UCR2_SRST) &&
655 * Allocate the IRQ(s) i.MX1 has three interrupts whereas later
656 * chips only have one interrupt.
658 if (sport->txirq > 0) {
659 retval = request_irq(sport->rxirq, imx_rxint, 0,
664 retval = request_irq(sport->txirq, imx_txint, 0,
669 /* do not use RTS IRQ on IrDA */
670 if (!USE_IRDA(sport)) {
671 retval = request_irq(sport->rtsirq, imx_rtsint,
672 (sport->rtsirq < MAX_INTERNAL_IRQ) ? 0 :
673 IRQF_TRIGGER_FALLING |
680 retval = request_irq(sport->port.irq, imx_int, 0,
683 free_irq(sport->port.irq, sport);
689 * Finally, clear and enable interrupts
691 writel(USR1_RTSD, sport->port.membase + USR1);
693 temp = readl(sport->port.membase + UCR1);
694 temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
696 if (USE_IRDA(sport)) {
698 temp &= ~(UCR1_RTSDEN);
701 writel(temp, sport->port.membase + UCR1);
703 temp = readl(sport->port.membase + UCR2);
704 temp |= (UCR2_RXEN | UCR2_TXEN);
705 writel(temp, sport->port.membase + UCR2);
707 if (USE_IRDA(sport)) {
711 (readl(sport->port.membase + URXD0) & URXD_CHARRDY)) {
716 #if defined CONFIG_ARCH_MX2 || defined CONFIG_ARCH_MX3
717 temp = readl(sport->port.membase + UCR3);
718 temp |= UCR3_RXDMUXSEL;
719 writel(temp, sport->port.membase + UCR3);
722 if (USE_IRDA(sport)) {
723 temp = readl(sport->port.membase + UCR4);
724 if (sport->irda_inv_rx)
727 temp &= ~(UCR4_INVR);
728 writel(temp | UCR4_DREN, sport->port.membase + UCR4);
730 temp = readl(sport->port.membase + UCR3);
731 if (sport->irda_inv_tx)
734 temp &= ~(UCR3_INVT);
735 writel(temp, sport->port.membase + UCR3);
739 * Enable modem status interrupts
741 spin_lock_irqsave(&sport->port.lock,flags);
742 imx_enable_ms(&sport->port);
743 spin_unlock_irqrestore(&sport->port.lock,flags);
745 if (USE_IRDA(sport)) {
746 struct imxuart_platform_data *pdata;
747 pdata = sport->port.dev->platform_data;
748 sport->irda_inv_rx = pdata->irda_inv_rx;
749 sport->irda_inv_tx = pdata->irda_inv_tx;
750 sport->trcv_delay = pdata->transceiver_delay;
751 if (pdata->irda_enable)
752 pdata->irda_enable(1);
759 free_irq(sport->txirq, sport);
762 free_irq(sport->rxirq, sport);
767 static void imx_shutdown(struct uart_port *port)
769 struct imx_port *sport = (struct imx_port *)port;
772 temp = readl(sport->port.membase + UCR2);
773 temp &= ~(UCR2_TXEN);
774 writel(temp, sport->port.membase + UCR2);
776 if (USE_IRDA(sport)) {
777 struct imxuart_platform_data *pdata;
778 pdata = sport->port.dev->platform_data;
779 if (pdata->irda_enable)
780 pdata->irda_enable(0);
786 del_timer_sync(&sport->timer);
789 * Free the interrupts
791 if (sport->txirq > 0) {
792 if (!USE_IRDA(sport))
793 free_irq(sport->rtsirq, sport);
794 free_irq(sport->txirq, sport);
795 free_irq(sport->rxirq, sport);
797 free_irq(sport->port.irq, sport);
800 * Disable all interrupts, port and break condition.
803 temp = readl(sport->port.membase + UCR1);
804 temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
806 temp &= ~(UCR1_IREN);
808 writel(temp, sport->port.membase + UCR1);
812 imx_set_termios(struct uart_port *port, struct ktermios *termios,
813 struct ktermios *old)
815 struct imx_port *sport = (struct imx_port *)port;
817 unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
818 unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
819 unsigned int div, ufcr;
820 unsigned long num, denom;
824 * If we don't support modem control lines, don't allow
828 termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
829 termios->c_cflag |= CLOCAL;
833 * We only support CS7 and CS8.
835 while ((termios->c_cflag & CSIZE) != CS7 &&
836 (termios->c_cflag & CSIZE) != CS8) {
837 termios->c_cflag &= ~CSIZE;
838 termios->c_cflag |= old_csize;
842 if ((termios->c_cflag & CSIZE) == CS8)
843 ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
845 ucr2 = UCR2_SRST | UCR2_IRTS;
847 if (termios->c_cflag & CRTSCTS) {
848 if( sport->have_rtscts ) {
852 termios->c_cflag &= ~CRTSCTS;
856 if (termios->c_cflag & CSTOPB)
858 if (termios->c_cflag & PARENB) {
860 if (termios->c_cflag & PARODD)
865 * Ask the core to calculate the divisor for us.
867 baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16);
868 quot = uart_get_divisor(port, baud);
870 spin_lock_irqsave(&sport->port.lock, flags);
872 sport->port.read_status_mask = 0;
873 if (termios->c_iflag & INPCK)
874 sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
875 if (termios->c_iflag & (BRKINT | PARMRK))
876 sport->port.read_status_mask |= URXD_BRK;
879 * Characters to ignore
881 sport->port.ignore_status_mask = 0;
882 if (termios->c_iflag & IGNPAR)
883 sport->port.ignore_status_mask |= URXD_PRERR;
884 if (termios->c_iflag & IGNBRK) {
885 sport->port.ignore_status_mask |= URXD_BRK;
887 * If we're ignoring parity and break indicators,
888 * ignore overruns too (for real raw support).
890 if (termios->c_iflag & IGNPAR)
891 sport->port.ignore_status_mask |= URXD_OVRRUN;
894 del_timer_sync(&sport->timer);
897 * Update the per-port timeout.
899 uart_update_timeout(port, termios->c_cflag, baud);
902 * disable interrupts and drain transmitter
904 old_ucr1 = readl(sport->port.membase + UCR1);
905 writel(old_ucr1 & ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
906 sport->port.membase + UCR1);
908 while ( !(readl(sport->port.membase + USR2) & USR2_TXDC))
911 /* then, disable everything */
912 old_txrxen = readl(sport->port.membase + UCR2);
913 writel(old_txrxen & ~( UCR2_TXEN | UCR2_RXEN),
914 sport->port.membase + UCR2);
915 old_txrxen &= (UCR2_TXEN | UCR2_RXEN);
917 if (USE_IRDA(sport)) {
919 * use maximum available submodule frequency to
920 * avoid missing short pulses due to low sampling rate
924 div = sport->port.uartclk / (baud * 16);
931 rational_best_approximation(16 * div * baud, sport->port.uartclk,
932 1 << 16, 1 << 16, &num, &denom);
934 tdiv64 = sport->port.uartclk;
936 do_div(tdiv64, denom * 16 * div);
937 tty_encode_baud_rate(sport->port.info->port.tty,
938 (speed_t)tdiv64, (speed_t)tdiv64);
943 ufcr = readl(sport->port.membase + UFCR);
944 ufcr = (ufcr & (~UFCR_RFDIV)) | UFCR_RFDIV_REG(div);
945 writel(ufcr, sport->port.membase + UFCR);
947 writel(num, sport->port.membase + UBIR);
948 writel(denom, sport->port.membase + UBMR);
951 writel(sport->port.uartclk / div / 1000, sport->port.membase + ONEMS);
954 writel(old_ucr1, sport->port.membase + UCR1);
956 /* set the parity, stop bits and data size */
957 writel(ucr2 | old_txrxen, sport->port.membase + UCR2);
959 if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
960 imx_enable_ms(&sport->port);
962 spin_unlock_irqrestore(&sport->port.lock, flags);
965 static const char *imx_type(struct uart_port *port)
967 struct imx_port *sport = (struct imx_port *)port;
969 return sport->port.type == PORT_IMX ? "IMX" : NULL;
973 * Release the memory region(s) being used by 'port'.
975 static void imx_release_port(struct uart_port *port)
977 struct platform_device *pdev = to_platform_device(port->dev);
978 struct resource *mmres;
980 mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
981 release_mem_region(mmres->start, mmres->end - mmres->start + 1);
985 * Request the memory region(s) being used by 'port'.
987 static int imx_request_port(struct uart_port *port)
989 struct platform_device *pdev = to_platform_device(port->dev);
990 struct resource *mmres;
993 mmres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
997 ret = request_mem_region(mmres->start, mmres->end - mmres->start + 1,
1000 return ret ? 0 : -EBUSY;
1004 * Configure/autoconfigure the port.
1006 static void imx_config_port(struct uart_port *port, int flags)
1008 struct imx_port *sport = (struct imx_port *)port;
1010 if (flags & UART_CONFIG_TYPE &&
1011 imx_request_port(&sport->port) == 0)
1012 sport->port.type = PORT_IMX;
1016 * Verify the new serial_struct (for TIOCSSERIAL).
1017 * The only change we allow are to the flags and type, and
1018 * even then only between PORT_IMX and PORT_UNKNOWN
1021 imx_verify_port(struct uart_port *port, struct serial_struct *ser)
1023 struct imx_port *sport = (struct imx_port *)port;
1026 if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
1028 if (sport->port.irq != ser->irq)
1030 if (ser->io_type != UPIO_MEM)
1032 if (sport->port.uartclk / 16 != ser->baud_base)
1034 if ((void *)sport->port.mapbase != ser->iomem_base)
1036 if (sport->port.iobase != ser->port)
1043 static struct uart_ops imx_pops = {
1044 .tx_empty = imx_tx_empty,
1045 .set_mctrl = imx_set_mctrl,
1046 .get_mctrl = imx_get_mctrl,
1047 .stop_tx = imx_stop_tx,
1048 .start_tx = imx_start_tx,
1049 .stop_rx = imx_stop_rx,
1050 .enable_ms = imx_enable_ms,
1051 .break_ctl = imx_break_ctl,
1052 .startup = imx_startup,
1053 .shutdown = imx_shutdown,
1054 .set_termios = imx_set_termios,
1056 .release_port = imx_release_port,
1057 .request_port = imx_request_port,
1058 .config_port = imx_config_port,
1059 .verify_port = imx_verify_port,
1062 static struct imx_port *imx_ports[UART_NR];
1064 #ifdef CONFIG_SERIAL_IMX_CONSOLE
1065 static void imx_console_putchar(struct uart_port *port, int ch)
1067 struct imx_port *sport = (struct imx_port *)port;
1069 while (readl(sport->port.membase + UTS) & UTS_TXFULL)
1072 writel(ch, sport->port.membase + URTX0);
1076 * Interrupts are disabled on entering
1079 imx_console_write(struct console *co, const char *s, unsigned int count)
1081 struct imx_port *sport = imx_ports[co->index];
1082 unsigned int old_ucr1, old_ucr2;
1085 * First, save UCR1/2 and then disable interrupts
1087 old_ucr1 = readl(sport->port.membase + UCR1);
1088 old_ucr2 = readl(sport->port.membase + UCR2);
1090 writel((old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN) &
1091 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN),
1092 sport->port.membase + UCR1);
1094 writel(old_ucr2 | UCR2_TXEN, sport->port.membase + UCR2);
1096 uart_console_write(&sport->port, s, count, imx_console_putchar);
1099 * Finally, wait for transmitter to become empty
1100 * and restore UCR1/2
1102 while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
1104 writel(old_ucr1, sport->port.membase + UCR1);
1105 writel(old_ucr2, sport->port.membase + UCR2);
1109 * If the port was already initialised (eg, by a boot loader),
1110 * try to determine the current setup.
1113 imx_console_get_options(struct imx_port *sport, int *baud,
1114 int *parity, int *bits)
1117 if ( readl(sport->port.membase + UCR1) | UCR1_UARTEN ) {
1118 /* ok, the port was enabled */
1119 unsigned int ucr2, ubir,ubmr, uartclk;
1120 unsigned int baud_raw;
1121 unsigned int ucfr_rfdiv;
1123 ucr2 = readl(sport->port.membase + UCR2);
1126 if (ucr2 & UCR2_PREN) {
1127 if (ucr2 & UCR2_PROE)
1138 ubir = readl(sport->port.membase + UBIR) & 0xffff;
1139 ubmr = readl(sport->port.membase + UBMR) & 0xffff;
1141 ucfr_rfdiv = (readl(sport->port.membase + UFCR) & UFCR_RFDIV) >> 7;
1142 if (ucfr_rfdiv == 6)
1145 ucfr_rfdiv = 6 - ucfr_rfdiv;
1147 uartclk = clk_get_rate(sport->clk);
1148 uartclk /= ucfr_rfdiv;
1151 * The next code provides exact computation of
1152 * baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
1153 * without need of float support or long long division,
1154 * which would be required to prevent 32bit arithmetic overflow
1156 unsigned int mul = ubir + 1;
1157 unsigned int div = 16 * (ubmr + 1);
1158 unsigned int rem = uartclk % div;
1160 baud_raw = (uartclk / div) * mul;
1161 baud_raw += (rem * mul + div / 2) / div;
1162 *baud = (baud_raw + 50) / 100 * 100;
1165 if(*baud != baud_raw)
1166 printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
1172 imx_console_setup(struct console *co, char *options)
1174 struct imx_port *sport;
1181 * Check whether an invalid uart number has been specified, and
1182 * if so, search for the first available port that does have
1185 if (co->index == -1 || co->index >= ARRAY_SIZE(imx_ports))
1187 sport = imx_ports[co->index];
1192 uart_parse_options(options, &baud, &parity, &bits, &flow);
1194 imx_console_get_options(sport, &baud, &parity, &bits);
1196 imx_setup_ufcr(sport, 0);
1198 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
1201 static struct uart_driver imx_reg;
1202 static struct console imx_console = {
1204 .write = imx_console_write,
1205 .device = uart_console_device,
1206 .setup = imx_console_setup,
1207 .flags = CON_PRINTBUFFER,
1212 #define IMX_CONSOLE &imx_console
1214 #define IMX_CONSOLE NULL
1217 static struct uart_driver imx_reg = {
1218 .owner = THIS_MODULE,
1219 .driver_name = DRIVER_NAME,
1220 .dev_name = DEV_NAME,
1221 .major = SERIAL_IMX_MAJOR,
1222 .minor = MINOR_START,
1223 .nr = ARRAY_SIZE(imx_ports),
1224 .cons = IMX_CONSOLE,
1227 static int serial_imx_suspend(struct platform_device *dev, pm_message_t state)
1229 struct imx_port *sport = platform_get_drvdata(dev);
1232 uart_suspend_port(&imx_reg, &sport->port);
1237 static int serial_imx_resume(struct platform_device *dev)
1239 struct imx_port *sport = platform_get_drvdata(dev);
1242 uart_resume_port(&imx_reg, &sport->port);
1247 static int serial_imx_probe(struct platform_device *pdev)
1249 struct imx_port *sport;
1250 struct imxuart_platform_data *pdata;
1253 struct resource *res;
1255 sport = kzalloc(sizeof(*sport), GFP_KERNEL);
1259 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1265 base = ioremap(res->start, PAGE_SIZE);
1271 sport->port.dev = &pdev->dev;
1272 sport->port.mapbase = res->start;
1273 sport->port.membase = base;
1274 sport->port.type = PORT_IMX,
1275 sport->port.iotype = UPIO_MEM;
1276 sport->port.irq = platform_get_irq(pdev, 0);
1277 sport->rxirq = platform_get_irq(pdev, 0);
1278 sport->txirq = platform_get_irq(pdev, 1);
1279 sport->rtsirq = platform_get_irq(pdev, 2);
1280 sport->port.fifosize = 32;
1281 sport->port.ops = &imx_pops;
1282 sport->port.flags = UPF_BOOT_AUTOCONF;
1283 sport->port.line = pdev->id;
1284 init_timer(&sport->timer);
1285 sport->timer.function = imx_timeout;
1286 sport->timer.data = (unsigned long)sport;
1288 sport->clk = clk_get(&pdev->dev, "uart");
1289 if (IS_ERR(sport->clk)) {
1290 ret = PTR_ERR(sport->clk);
1293 clk_enable(sport->clk);
1295 sport->port.uartclk = clk_get_rate(sport->clk);
1297 imx_ports[pdev->id] = sport;
1299 pdata = pdev->dev.platform_data;
1300 if (pdata && (pdata->flags & IMXUART_HAVE_RTSCTS))
1301 sport->have_rtscts = 1;
1304 if (pdata && (pdata->flags & IMXUART_IRDA))
1305 sport->use_irda = 1;
1309 ret = pdata->init(pdev);
1314 ret = uart_add_one_port(&imx_reg, &sport->port);
1317 platform_set_drvdata(pdev, &sport->port);
1324 clk_put(sport->clk);
1325 clk_disable(sport->clk);
1327 iounmap(sport->port.membase);
1334 static int serial_imx_remove(struct platform_device *pdev)
1336 struct imxuart_platform_data *pdata;
1337 struct imx_port *sport = platform_get_drvdata(pdev);
1339 pdata = pdev->dev.platform_data;
1341 platform_set_drvdata(pdev, NULL);
1344 uart_remove_one_port(&imx_reg, &sport->port);
1345 clk_put(sport->clk);
1348 clk_disable(sport->clk);
1353 iounmap(sport->port.membase);
1359 static struct platform_driver serial_imx_driver = {
1360 .probe = serial_imx_probe,
1361 .remove = serial_imx_remove,
1363 .suspend = serial_imx_suspend,
1364 .resume = serial_imx_resume,
1367 .owner = THIS_MODULE,
1371 static int __init imx_serial_init(void)
1375 printk(KERN_INFO "Serial: IMX driver\n");
1377 ret = uart_register_driver(&imx_reg);
1381 ret = platform_driver_register(&serial_imx_driver);
1383 uart_unregister_driver(&imx_reg);
1388 static void __exit imx_serial_exit(void)
1390 platform_driver_unregister(&serial_imx_driver);
1391 uart_unregister_driver(&imx_reg);
1394 module_init(imx_serial_init);
1395 module_exit(imx_serial_exit);
1397 MODULE_AUTHOR("Sascha Hauer");
1398 MODULE_DESCRIPTION("IMX generic serial port driver");
1399 MODULE_LICENSE("GPL");
1400 MODULE_ALIAS("platform:imx-uart");