1 /* MN10300 On-chip serial port UART driver
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
12 static const char serial_name[] = "MN10300 Serial driver";
13 static const char serial_version[] = "mn10300_serial-1.0";
14 static const char serial_revdate[] = "2007-11-06";
16 #if defined(CONFIG_MN10300_TTYSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
20 #include <linux/module.h>
21 #include <linux/serial.h>
22 #include <linux/circ_buf.h>
23 #include <linux/errno.h>
24 #include <linux/signal.h>
25 #include <linux/sched.h>
26 #include <linux/timer.h>
27 #include <linux/interrupt.h>
28 #include <linux/tty.h>
29 #include <linux/tty_flip.h>
30 #include <linux/major.h>
31 #include <linux/string.h>
32 #include <linux/ioport.h>
34 #include <linux/slab.h>
35 #include <linux/init.h>
36 #include <linux/console.h>
37 #include <linux/sysrq.h>
41 #include <asm/bitops.h>
42 #include <asm/serial-regs.h>
43 #include <unit/timex.h>
44 #include "mn10300-serial.h"
48 #define GxICR(X) CROSS_GxICR(X, 0)
49 #endif /* CONFIG_SMP */
51 #define kenter(FMT, ...) \
52 printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__)
53 #define _enter(FMT, ...) \
54 no_printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__)
55 #define kdebug(FMT, ...) \
56 printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__)
57 #define _debug(FMT, ...) \
58 no_printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__)
59 #define kproto(FMT, ...) \
60 printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__)
61 #define _proto(FMT, ...) \
62 no_printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__)
65 /* c_cflag bit meaning */
66 #define CODMSB 004000000000 /* change Transfer bit-order */
71 #ifdef CONFIG_MN10300_TTYSM_CONSOLE
72 static void mn10300_serial_console_write(struct console *co,
73 const char *s, unsigned count);
74 static int __init mn10300_serial_console_setup(struct console *co,
77 static struct uart_driver mn10300_serial_driver;
78 static struct console mn10300_serial_console = {
80 .write = mn10300_serial_console_write,
81 .device = uart_console_device,
82 .setup = mn10300_serial_console_setup,
83 .flags = CON_PRINTBUFFER,
85 .data = &mn10300_serial_driver,
89 static struct uart_driver mn10300_serial_driver = {
91 .driver_name = "mn10300-serial",
96 #ifdef CONFIG_MN10300_TTYSM_CONSOLE
97 .cons = &mn10300_serial_console,
101 static unsigned int mn10300_serial_tx_empty(struct uart_port *);
102 static void mn10300_serial_set_mctrl(struct uart_port *, unsigned int mctrl);
103 static unsigned int mn10300_serial_get_mctrl(struct uart_port *);
104 static void mn10300_serial_stop_tx(struct uart_port *);
105 static void mn10300_serial_start_tx(struct uart_port *);
106 static void mn10300_serial_send_xchar(struct uart_port *, char ch);
107 static void mn10300_serial_stop_rx(struct uart_port *);
108 static void mn10300_serial_enable_ms(struct uart_port *);
109 static void mn10300_serial_break_ctl(struct uart_port *, int ctl);
110 static int mn10300_serial_startup(struct uart_port *);
111 static void mn10300_serial_shutdown(struct uart_port *);
112 static void mn10300_serial_set_termios(struct uart_port *,
113 struct ktermios *new,
114 struct ktermios *old);
115 static const char *mn10300_serial_type(struct uart_port *);
116 static void mn10300_serial_release_port(struct uart_port *);
117 static int mn10300_serial_request_port(struct uart_port *);
118 static void mn10300_serial_config_port(struct uart_port *, int);
119 static int mn10300_serial_verify_port(struct uart_port *,
120 struct serial_struct *);
121 #ifdef CONFIG_CONSOLE_POLL
122 static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char);
123 static int mn10300_serial_poll_get_char(struct uart_port *);
126 static const struct uart_ops mn10300_serial_ops = {
127 .tx_empty = mn10300_serial_tx_empty,
128 .set_mctrl = mn10300_serial_set_mctrl,
129 .get_mctrl = mn10300_serial_get_mctrl,
130 .stop_tx = mn10300_serial_stop_tx,
131 .start_tx = mn10300_serial_start_tx,
132 .send_xchar = mn10300_serial_send_xchar,
133 .stop_rx = mn10300_serial_stop_rx,
134 .enable_ms = mn10300_serial_enable_ms,
135 .break_ctl = mn10300_serial_break_ctl,
136 .startup = mn10300_serial_startup,
137 .shutdown = mn10300_serial_shutdown,
138 .set_termios = mn10300_serial_set_termios,
139 .type = mn10300_serial_type,
140 .release_port = mn10300_serial_release_port,
141 .request_port = mn10300_serial_request_port,
142 .config_port = mn10300_serial_config_port,
143 .verify_port = mn10300_serial_verify_port,
144 #ifdef CONFIG_CONSOLE_POLL
145 .poll_put_char = mn10300_serial_poll_put_char,
146 .poll_get_char = mn10300_serial_poll_get_char,
150 static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
153 * the first on-chip serial port: ttySM0 (aka SIF0)
155 #ifdef CONFIG_MN10300_TTYSM0
156 struct mn10300_serial_port mn10300_serial_port_sif0 = {
157 .uart.ops = &mn10300_serial_ops,
158 .uart.membase = (void __iomem *) &SC0CTR,
159 .uart.mapbase = (unsigned long) &SC0CTR,
160 .uart.iotype = UPIO_MEM,
162 .uart.uartclk = 0, /* MN10300_IOCLK, */
164 .uart.flags = UPF_BOOT_AUTOCONF,
166 .uart.type = PORT_MN10300,
168 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif0.uart.lock),
172 ._status = (volatile u8 *)&SC0STR,
176 .rx_name = "ttySM0:Rx",
177 .tx_name = "ttySM0:Tx",
178 #if defined(CONFIG_MN10300_TTYSM0_TIMER8)
179 .tm_name = "ttySM0:Timer8",
184 .div_timer = MNSCx_DIV_TIMER_16BIT,
185 #elif defined(CONFIG_MN10300_TTYSM0_TIMER0)
186 .tm_name = "ttySM0:Timer0",
188 ._tmxbr = (volatile u16 *)&TM0BR,
191 .div_timer = MNSCx_DIV_TIMER_8BIT,
192 #elif defined(CONFIG_MN10300_TTYSM0_TIMER2)
193 .tm_name = "ttySM0:Timer2",
195 ._tmxbr = (volatile u16 *)&TM2BR,
198 .div_timer = MNSCx_DIV_TIMER_8BIT,
200 #error "Unknown config for ttySM0"
204 .rx_icr = &GxICR(SC0RXIRQ),
205 .tx_icr = &GxICR(SC0TXIRQ),
206 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
208 #ifdef CONFIG_GDBSTUB_ON_TTYSM0
212 #endif /* CONFIG_MN10300_TTYSM0 */
215 * the second on-chip serial port: ttySM1 (aka SIF1)
217 #ifdef CONFIG_MN10300_TTYSM1
218 struct mn10300_serial_port mn10300_serial_port_sif1 = {
219 .uart.ops = &mn10300_serial_ops,
220 .uart.membase = (void __iomem *) &SC1CTR,
221 .uart.mapbase = (unsigned long) &SC1CTR,
222 .uart.iotype = UPIO_MEM,
224 .uart.uartclk = 0, /* MN10300_IOCLK, */
226 .uart.flags = UPF_BOOT_AUTOCONF,
228 .uart.type = PORT_MN10300,
230 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif1.uart.lock),
234 ._status = (volatile u8 *)&SC1STR,
238 .rx_name = "ttySM1:Rx",
239 .tx_name = "ttySM1:Tx",
240 #if defined(CONFIG_MN10300_TTYSM1_TIMER9)
241 .tm_name = "ttySM1:Timer9",
246 .div_timer = MNSCx_DIV_TIMER_16BIT,
247 #elif defined(CONFIG_MN10300_TTYSM1_TIMER3)
248 .tm_name = "ttySM1:Timer3",
250 ._tmxbr = (volatile u16 *)&TM3BR,
253 .div_timer = MNSCx_DIV_TIMER_8BIT,
254 #elif defined(CONFIG_MN10300_TTYSM1_TIMER12)
255 .tm_name = "ttySM1/Timer12",
260 .div_timer = MNSCx_DIV_TIMER_16BIT,
262 #error "Unknown config for ttySM1"
266 .rx_icr = &GxICR(SC1RXIRQ),
267 .tx_icr = &GxICR(SC1TXIRQ),
268 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
270 #ifdef CONFIG_GDBSTUB_ON_TTYSM1
274 #endif /* CONFIG_MN10300_TTYSM1 */
277 * the third on-chip serial port: ttySM2 (aka SIF2)
279 #ifdef CONFIG_MN10300_TTYSM2
280 struct mn10300_serial_port mn10300_serial_port_sif2 = {
281 .uart.ops = &mn10300_serial_ops,
282 .uart.membase = (void __iomem *) &SC2CTR,
283 .uart.mapbase = (unsigned long) &SC2CTR,
284 .uart.iotype = UPIO_MEM,
286 .uart.uartclk = 0, /* MN10300_IOCLK, */
288 .uart.flags = UPF_BOOT_AUTOCONF,
290 #ifdef CONFIG_MN10300_TTYSM2_CTS
291 .uart.type = PORT_MN10300_CTS,
293 .uart.type = PORT_MN10300,
296 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif2.uart.lock),
300 ._status = (volatile u8 *)&SC2STR,
304 .rx_name = "ttySM2:Rx",
305 .tx_name = "ttySM2:Tx",
306 #if defined(CONFIG_MN10300_TTYSM2_TIMER10)
307 .tm_name = "ttySM2/Timer10",
312 .div_timer = MNSCx_DIV_TIMER_16BIT,
313 #elif defined(CONFIG_MN10300_TTYSM2_TIMER9)
314 .tm_name = "ttySM2/Timer9",
319 .div_timer = MNSCx_DIV_TIMER_16BIT,
320 #elif defined(CONFIG_MN10300_TTYSM2_TIMER1)
321 .tm_name = "ttySM2/Timer1",
323 ._tmxbr = (volatile u16 *)&TM1BR,
326 .div_timer = MNSCx_DIV_TIMER_8BIT,
327 #elif defined(CONFIG_MN10300_TTYSM2_TIMER3)
328 .tm_name = "ttySM2/Timer3",
330 ._tmxbr = (volatile u16 *)&TM3BR,
333 .div_timer = MNSCx_DIV_TIMER_8BIT,
335 #error "Unknown config for ttySM2"
339 .rx_icr = &GxICR(SC2RXIRQ),
340 .tx_icr = &GxICR(SC2TXIRQ),
341 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
342 #ifdef CONFIG_MN10300_TTYSM2_CTS
343 .options = MNSCx_OPT_CTS,
347 #ifdef CONFIG_GDBSTUB_ON_TTYSM2
351 #endif /* CONFIG_MN10300_TTYSM2 */
355 * list of available serial ports
357 struct mn10300_serial_port *mn10300_serial_ports[NR_UARTS + 1] = {
358 #ifdef CONFIG_MN10300_TTYSM0
359 [0] = &mn10300_serial_port_sif0,
361 #ifdef CONFIG_MN10300_TTYSM1
362 [1] = &mn10300_serial_port_sif1,
364 #ifdef CONFIG_MN10300_TTYSM2
365 [2] = &mn10300_serial_port_sif2,
372 * we abuse the serial ports' baud timers' interrupt lines to get the ability
373 * to deliver interrupts to userspace as we use the ports' interrupt lines to
374 * do virtual DMA on account of the ports having no hardware FIFOs
376 * we can generate an interrupt manually in the assembly stubs by writing to
377 * the enable and detect bits in the interrupt control register, so all we need
378 * to do here is disable the interrupt line
380 * note that we can't just leave the line enabled as the baud rate timer *also*
381 * generates interrupts
383 static void mn10300_serial_mask_ack(unsigned int irq)
388 flags = arch_local_cli_save();
389 GxICR(irq) = GxICR_LEVEL_6;
390 tmp = GxICR(irq); /* flush write buffer */
391 arch_local_irq_restore(flags);
394 static void mn10300_serial_chip_mask_ack(struct irq_data *d)
396 mn10300_serial_mask_ack(d->irq);
399 static void mn10300_serial_nop(struct irq_data *d)
403 static struct irq_chip mn10300_serial_pic = {
405 .irq_ack = mn10300_serial_chip_mask_ack,
406 .irq_mask = mn10300_serial_chip_mask_ack,
407 .irq_mask_ack = mn10300_serial_chip_mask_ack,
408 .irq_unmask = mn10300_serial_nop,
413 * serial virtual DMA interrupt jump table
415 struct mn10300_serial_int mn10300_serial_int_tbl[NR_IRQS];
417 static void mn10300_serial_dis_tx_intr(struct mn10300_serial_port *port)
422 flags = arch_local_cli_save();
423 *port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
425 arch_local_irq_restore(flags);
428 static void mn10300_serial_en_tx_intr(struct mn10300_serial_port *port)
433 flags = arch_local_cli_save();
435 NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) | GxICR_ENABLE;
437 arch_local_irq_restore(flags);
440 static void mn10300_serial_dis_rx_intr(struct mn10300_serial_port *port)
445 flags = arch_local_cli_save();
446 *port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
448 arch_local_irq_restore(flags);
452 * multi-bit equivalent of test_and_clear_bit()
454 static int mask_test_and_clear(volatile u8 *ptr, u8 mask)
457 asm volatile(" bclr %1,(%2) \n"
459 : "=d"(epsw) : "d"(mask), "a"(ptr)
461 return !(epsw & EPSW_FLAG_Z);
465 * receive chars from the ring buffer for this serial port
466 * - must do break detection here (not done in the UART)
468 static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
470 struct uart_icount *icount = &port->uart.icount;
471 struct tty_struct *tty = port->uart.state->port.tty;
474 u8 st, ch, push, status, overrun;
476 _enter("%s", port->name);
480 count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
481 count = tty_buffer_request_room(tty, count);
483 if (!tty->low_latency)
484 tty_flip_buffer_push(tty);
489 /* pull chars out of the hat */
491 if (ix == port->rx_inp) {
492 if (push && !tty->low_latency)
493 tty_flip_buffer_push(tty);
497 ch = port->rx_buffer[ix++];
498 st = port->rx_buffer[ix++];
500 port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
501 port->uart.icount.rx++;
503 st &= SC01STR_FEF | SC01STR_PEF | SC01STR_OEF;
507 /* the UART doesn't detect BREAK, so we have to do that ourselves
508 * - it starts as a framing error on a NUL character
509 * - then we count another two NUL characters before issuing TTY_BREAK
510 * - then we end on a normal char or one that has all the bottom bits
511 * zero and the top bits set
513 switch (port->rx_brk) {
515 /* not breaking at the moment */
519 if (st & SC01STR_FEF && ch == 0) {
526 if (st & SC01STR_FEF && ch == 0) {
528 _proto("Rx Break Detected");
530 if (uart_handle_break(&port->uart))
532 status |= 1 << TTY_BREAK;
538 if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF))
539 goto try_again; /* still breaking */
541 port->rx_brk = 0; /* end of the break */
553 /* discard char at probable break end */
560 /* handle framing error */
561 if (st & SC01STR_FEF) {
563 /* framing error with NUL char is probably a BREAK */
568 _proto("Rx Framing Error");
570 status |= 1 << TTY_FRAME;
573 /* handle parity error */
574 if (st & SC01STR_PEF) {
575 _proto("Rx Parity Error");
580 /* handle normal char */
582 if (uart_handle_sysrq_char(&port->uart, ch))
584 status = (1 << TTY_NORMAL);
587 /* handle overrun error */
588 if (st & SC01STR_OEF) {
592 _proto("Rx Overrun Error");
598 status &= port->uart.read_status_mask;
600 if (!overrun && !(status & port->uart.ignore_status_mask)) {
603 if (status & (1 << TTY_BREAK))
605 else if (status & (1 << TTY_PARITY))
607 else if (status & (1 << TTY_FRAME))
612 tty_insert_flip_char(tty, ch, flag);
615 /* overrun is special, since it's reported immediately, and doesn't
616 * affect the current character
619 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
623 if (!tty->low_latency)
624 tty_flip_buffer_push(tty);
638 * handle an interrupt from the serial transmission "virtual DMA" driver
639 * - note: the interrupt routine will disable its own interrupts when the Tx
642 static void mn10300_serial_transmit_interrupt(struct mn10300_serial_port *port)
644 _enter("%s", port->name);
646 if (!port->uart.state || !port->uart.state->port.tty) {
647 mn10300_serial_dis_tx_intr(port);
651 if (uart_tx_stopped(&port->uart) ||
652 uart_circ_empty(&port->uart.state->xmit))
653 mn10300_serial_dis_tx_intr(port);
655 if (uart_circ_chars_pending(&port->uart.state->xmit) < WAKEUP_CHARS)
656 uart_write_wakeup(&port->uart);
660 * deal with a change in the status of the CTS line
662 static void mn10300_serial_cts_changed(struct mn10300_serial_port *port, u8 st)
667 port->uart.icount.cts++;
669 /* flip the CTS state selector flag to interrupt when it changes
671 ctr = *port->_control;
673 *port->_control = ctr;
675 uart_handle_cts_change(&port->uart, st & SC2STR_CTS);
676 wake_up_interruptible(&port->uart.state->port.delta_msr_wait);
680 * handle a virtual interrupt generated by the lower level "virtual DMA"
681 * routines (irq is the baud timer interrupt)
683 static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id)
685 struct mn10300_serial_port *port = dev_id;
688 spin_lock(&port->uart.lock);
690 if (port->intr_flags) {
691 _debug("INT %s: %x", port->name, port->intr_flags);
693 if (mask_test_and_clear(&port->intr_flags, MNSCx_RX_AVAIL))
694 mn10300_serial_receive_interrupt(port);
696 if (mask_test_and_clear(&port->intr_flags,
697 MNSCx_TX_SPACE | MNSCx_TX_EMPTY))
698 mn10300_serial_transmit_interrupt(port);
701 /* the only modem control line amongst the whole lot is CTS on
703 if (port->type == PORT_MN10300_CTS) {
705 if ((port->tx_cts ^ st) & SC2STR_CTS)
706 mn10300_serial_cts_changed(port, st);
709 spin_unlock(&port->uart.lock);
715 * return indication of whether the hardware transmit buffer is empty
717 static unsigned int mn10300_serial_tx_empty(struct uart_port *_port)
719 struct mn10300_serial_port *port =
720 container_of(_port, struct mn10300_serial_port, uart);
722 _enter("%s", port->name);
724 return (*port->_status & (SC01STR_TXF | SC01STR_TBF)) ?
729 * set the modem control lines (we don't have any)
731 static void mn10300_serial_set_mctrl(struct uart_port *_port,
734 struct mn10300_serial_port *port __attribute__ ((unused)) =
735 container_of(_port, struct mn10300_serial_port, uart);
737 _enter("%s,%x", port->name, mctrl);
741 * get the modem control line statuses
743 static unsigned int mn10300_serial_get_mctrl(struct uart_port *_port)
745 struct mn10300_serial_port *port =
746 container_of(_port, struct mn10300_serial_port, uart);
748 _enter("%s", port->name);
750 if (port->type == PORT_MN10300_CTS && !(*port->_status & SC2STR_CTS))
751 return TIOCM_CAR | TIOCM_DSR;
753 return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
757 * stop transmitting characters
759 static void mn10300_serial_stop_tx(struct uart_port *_port)
761 struct mn10300_serial_port *port =
762 container_of(_port, struct mn10300_serial_port, uart);
764 _enter("%s", port->name);
766 /* disable the virtual DMA */
767 mn10300_serial_dis_tx_intr(port);
771 * start transmitting characters
772 * - jump-start transmission if it has stalled
773 * - enable the serial Tx interrupt (used by the virtual DMA controller)
774 * - force an interrupt to happen if necessary
776 static void mn10300_serial_start_tx(struct uart_port *_port)
778 struct mn10300_serial_port *port =
779 container_of(_port, struct mn10300_serial_port, uart);
785 CIRC_CNT(&port->uart.state->xmit.head,
786 &port->uart.state->xmit.tail,
789 /* kick the virtual DMA controller */
794 if (*port->_status & SC01STR_TBF)
795 x &= ~(GxICR_REQUEST | GxICR_DETECT);
797 x |= GxICR_REQUEST | GxICR_DETECT;
799 _debug("CTR=%04hx ICR=%02hx STR=%04x TMD=%02hx TBR=%04hx ICR=%04hx",
800 *port->_control, *port->_intr, *port->_status,
802 (port->div_timer == MNSCx_DIV_TIMER_8BIT) ?
803 *(volatile u8 *)port->_tmxbr : *port->_tmxbr,
812 * transmit a high-priority XON/XOFF character
814 static void mn10300_serial_send_xchar(struct uart_port *_port, char ch)
816 struct mn10300_serial_port *port =
817 container_of(_port, struct mn10300_serial_port, uart);
819 _enter("%s,%02x", port->name, ch);
821 if (likely(port->gdbstub)) {
824 mn10300_serial_en_tx_intr(port);
829 * stop receiving characters
830 * - called whilst the port is being closed
832 static void mn10300_serial_stop_rx(struct uart_port *_port)
834 struct mn10300_serial_port *port =
835 container_of(_port, struct mn10300_serial_port, uart);
839 _enter("%s", port->name);
841 ctr = *port->_control;
843 *port->_control = ctr;
845 mn10300_serial_dis_rx_intr(port);
849 * enable modem status interrupts
851 static void mn10300_serial_enable_ms(struct uart_port *_port)
853 struct mn10300_serial_port *port =
854 container_of(_port, struct mn10300_serial_port, uart);
858 _enter("%s", port->name);
860 if (port->type == PORT_MN10300_CTS) {
861 /* want to interrupt when CTS goes low if CTS is now high and
864 port->tx_cts = *port->_status;
866 cts = (port->tx_cts & SC2STR_CTS) ?
867 SC2CTR_TWE : SC2CTR_TWE | SC2CTR_TWS;
869 ctr = *port->_control;
872 *port->_control = ctr;
874 mn10300_serial_en_tx_intr(port);
879 * transmit or cease transmitting a break signal
881 static void mn10300_serial_break_ctl(struct uart_port *_port, int ctl)
883 struct mn10300_serial_port *port =
884 container_of(_port, struct mn10300_serial_port, uart);
886 _enter("%s,%d", port->name, ctl);
889 /* tell the virtual DMA handler to assert BREAK */
891 mn10300_serial_en_tx_intr(port);
894 *port->_control &= ~SC01CTR_BKE;
895 mn10300_serial_en_tx_intr(port);
900 * grab the interrupts and enable the port for reception
902 static int mn10300_serial_startup(struct uart_port *_port)
904 struct mn10300_serial_port *port =
905 container_of(_port, struct mn10300_serial_port, uart);
906 struct mn10300_serial_int *pint;
908 _enter("%s{%d}", port->name, port->gdbstub);
910 if (unlikely(port->gdbstub))
913 /* allocate an Rx buffer for the virtual DMA handler */
914 port->rx_buffer = kmalloc(MNSC_BUFFER_SIZE, GFP_KERNEL);
915 if (!port->rx_buffer)
918 port->rx_inp = port->rx_outp = 0;
920 /* finally, enable the device */
921 *port->_intr = SC01ICR_TI;
922 *port->_control |= SC01CTR_TXE | SC01CTR_RXE;
924 pint = &mn10300_serial_int_tbl[port->rx_irq];
926 pint->vdma = mn10300_serial_vdma_rx_handler;
927 pint = &mn10300_serial_int_tbl[port->tx_irq];
929 pint->vdma = mn10300_serial_vdma_tx_handler;
931 set_intr_level(port->rx_irq,
932 NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL));
933 set_intr_level(port->tx_irq,
934 NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL));
935 irq_set_chip(port->tm_irq, &mn10300_serial_pic);
937 if (request_irq(port->rx_irq, mn10300_serial_interrupt,
938 IRQF_DISABLED, port->rx_name, port) < 0)
941 if (request_irq(port->tx_irq, mn10300_serial_interrupt,
942 IRQF_DISABLED, port->tx_name, port) < 0)
945 if (request_irq(port->tm_irq, mn10300_serial_interrupt,
946 IRQF_DISABLED, port->tm_name, port) < 0)
948 mn10300_serial_mask_ack(port->tm_irq);
953 free_irq(port->tx_irq, port);
955 free_irq(port->rx_irq, port);
957 kfree(port->rx_buffer);
958 port->rx_buffer = NULL;
963 * shutdown the port and release interrupts
965 static void mn10300_serial_shutdown(struct uart_port *_port)
968 struct mn10300_serial_port *port =
969 container_of(_port, struct mn10300_serial_port, uart);
971 _enter("%s", port->name);
973 /* disable the serial port and its baud rate timer */
975 *port->_control &= ~(SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
978 if (port->rx_buffer) {
979 void *buf = port->rx_buffer;
980 port->rx_buffer = NULL;
984 /* disable all intrs */
985 free_irq(port->tm_irq, port);
986 free_irq(port->rx_irq, port);
987 free_irq(port->tx_irq, port);
990 *port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
992 *port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
998 * this routine is called to set the UART divisor registers to match the
999 * specified baud rate for a serial port.
1001 static void mn10300_serial_change_speed(struct mn10300_serial_port *port,
1002 struct ktermios *new,
1003 struct ktermios *old)
1005 unsigned long flags;
1006 unsigned long ioclk = port->ioclk;
1008 int baud, bits, xdiv, tmp;
1011 u8 div_timer = port->div_timer;
1013 _enter("%s{%lu}", port->name, ioclk);
1015 /* byte size and parity */
1016 cflag = new->c_cflag;
1017 switch (cflag & CSIZE) {
1018 case CS7: scxctr = SC01CTR_CLN_7BIT; bits = 9; break;
1019 case CS8: scxctr = SC01CTR_CLN_8BIT; bits = 10; break;
1020 default: scxctr = SC01CTR_CLN_8BIT; bits = 10; break;
1023 if (cflag & CSTOPB) {
1024 scxctr |= SC01CTR_STB_2BIT;
1028 if (cflag & PARENB) {
1031 scxctr |= SC01CTR_PB_ODD;
1033 else if (cflag & CMSPAR)
1034 scxctr |= SC01CTR_PB_FIXED0;
1037 scxctr |= SC01CTR_PB_EVEN;
1040 /* Determine divisor based on baud rate */
1043 switch (port->uart.line) {
1044 #ifdef CONFIG_MN10300_TTYSM0
1045 case 0: /* ttySM0 */
1046 #if defined(CONFIG_MN10300_TTYSM0_TIMER8)
1047 scxctr |= SC0CTR_CK_TM8UFLOW_8;
1048 #elif defined(CONFIG_MN10300_TTYSM0_TIMER0)
1049 scxctr |= SC0CTR_CK_TM0UFLOW_8;
1050 #elif defined(CONFIG_MN10300_TTYSM0_TIMER2)
1051 scxctr |= SC0CTR_CK_TM2UFLOW_8;
1053 #error "Unknown config for ttySM0"
1056 #endif /* CONFIG_MN10300_TTYSM0 */
1058 #ifdef CONFIG_MN10300_TTYSM1
1059 case 1: /* ttySM1 */
1060 #if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3)
1061 #if defined(CONFIG_MN10300_TTYSM1_TIMER9)
1062 scxctr |= SC1CTR_CK_TM9UFLOW_8;
1063 #elif defined(CONFIG_MN10300_TTYSM1_TIMER3)
1064 scxctr |= SC1CTR_CK_TM3UFLOW_8;
1066 #error "Unknown config for ttySM1"
1068 #else /* CONFIG_AM33_2 || CONFIG_AM33_3 */
1069 #if defined(CONFIG_MN10300_TTYSM1_TIMER12)
1070 scxctr |= SC1CTR_CK_TM12UFLOW_8;
1072 #error "Unknown config for ttySM1"
1074 #endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */
1076 #endif /* CONFIG_MN10300_TTYSM1 */
1078 #ifdef CONFIG_MN10300_TTYSM2
1079 case 2: /* ttySM2 */
1080 #if defined(CONFIG_AM33_2)
1081 #if defined(CONFIG_MN10300_TTYSM2_TIMER10)
1082 scxctr |= SC2CTR_CK_TM10UFLOW;
1084 #error "Unknown config for ttySM2"
1086 #else /* CONFIG_AM33_2 */
1087 #if defined(CONFIG_MN10300_TTYSM2_TIMER9)
1088 scxctr |= SC2CTR_CK_TM9UFLOW_8;
1089 #elif defined(CONFIG_MN10300_TTYSM2_TIMER1)
1090 scxctr |= SC2CTR_CK_TM1UFLOW_8;
1091 #elif defined(CONFIG_MN10300_TTYSM2_TIMER3)
1092 scxctr |= SC2CTR_CK_TM3UFLOW_8;
1094 #error "Unknown config for ttySM2"
1096 #endif /* CONFIG_AM33_2 */
1098 #endif /* CONFIG_MN10300_TTYSM2 */
1105 baud = uart_get_baud_rate(&port->uart, new, old, 0,
1108 _debug("ALT %d [baud %d]", battempt, baud);
1111 baud = 9600; /* B0 transition handled in rs_set_termios */
1114 baud = 269; /* 134 is really 134.5 */
1118 if (baud == 38400 &&
1119 (port->uart.flags & UPF_SPD_MASK) == UPF_SPD_CUST
1121 _debug("CUSTOM %u", port->uart.custom_divisor);
1123 if (div_timer == MNSCx_DIV_TIMER_16BIT) {
1124 if (port->uart.custom_divisor <= 65535) {
1125 tmxmd = TM8MD_SRC_IOCLK;
1126 tmxbr = port->uart.custom_divisor;
1127 port->uart.uartclk = ioclk;
1130 if (port->uart.custom_divisor / 8 <= 65535) {
1131 tmxmd = TM8MD_SRC_IOCLK_8;
1132 tmxbr = port->uart.custom_divisor / 8;
1133 port->uart.custom_divisor = tmxbr * 8;
1134 port->uart.uartclk = ioclk / 8;
1137 if (port->uart.custom_divisor / 32 <= 65535) {
1138 tmxmd = TM8MD_SRC_IOCLK_32;
1139 tmxbr = port->uart.custom_divisor / 32;
1140 port->uart.custom_divisor = tmxbr * 32;
1141 port->uart.uartclk = ioclk / 32;
1145 } else if (div_timer == MNSCx_DIV_TIMER_8BIT) {
1146 if (port->uart.custom_divisor <= 255) {
1147 tmxmd = TM2MD_SRC_IOCLK;
1148 tmxbr = port->uart.custom_divisor;
1149 port->uart.uartclk = ioclk;
1152 if (port->uart.custom_divisor / 8 <= 255) {
1153 tmxmd = TM2MD_SRC_IOCLK_8;
1154 tmxbr = port->uart.custom_divisor / 8;
1155 port->uart.custom_divisor = tmxbr * 8;
1156 port->uart.uartclk = ioclk / 8;
1159 if (port->uart.custom_divisor / 32 <= 255) {
1160 tmxmd = TM2MD_SRC_IOCLK_32;
1161 tmxbr = port->uart.custom_divisor / 32;
1162 port->uart.custom_divisor = tmxbr * 32;
1163 port->uart.uartclk = ioclk / 32;
1169 switch (div_timer) {
1170 case MNSCx_DIV_TIMER_16BIT:
1171 port->uart.uartclk = ioclk;
1172 tmxmd = TM8MD_SRC_IOCLK;
1173 tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
1174 if (tmp > 0 && tmp <= 65535)
1177 port->uart.uartclk = ioclk / 8;
1178 tmxmd = TM8MD_SRC_IOCLK_8;
1179 tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
1180 if (tmp > 0 && tmp <= 65535)
1183 port->uart.uartclk = ioclk / 32;
1184 tmxmd = TM8MD_SRC_IOCLK_32;
1185 tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
1186 if (tmp > 0 && tmp <= 65535)
1190 case MNSCx_DIV_TIMER_8BIT:
1191 port->uart.uartclk = ioclk;
1192 tmxmd = TM2MD_SRC_IOCLK;
1193 tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
1194 if (tmp > 0 && tmp <= 255)
1197 port->uart.uartclk = ioclk / 8;
1198 tmxmd = TM2MD_SRC_IOCLK_8;
1199 tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
1200 if (tmp > 0 && tmp <= 255)
1203 port->uart.uartclk = ioclk / 32;
1204 tmxmd = TM2MD_SRC_IOCLK_32;
1205 tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
1206 if (tmp > 0 && tmp <= 255)
1215 /* refuse to change to a baud rate we can't support */
1216 _debug("CAN'T SUPPORT");
1221 new->c_cflag &= ~CBAUD;
1222 new->c_cflag |= (old->c_cflag & CBAUD);
1224 goto try_alternative;
1228 /* as a last resort, if the quotient is zero, default to 9600
1230 new->c_cflag &= ~CBAUD;
1231 new->c_cflag |= B9600;
1233 goto try_alternative;
1236 /* hmmm... can't seem to support 9600 either
1237 * - we could try iterating through the speeds we know about to
1240 new->c_cflag &= ~CBAUD;
1243 if (div_timer == MNSCx_DIV_TIMER_16BIT)
1244 tmxmd = TM8MD_SRC_IOCLK_32;
1245 else if (div_timer == MNSCx_DIV_TIMER_8BIT)
1246 tmxmd = TM2MD_SRC_IOCLK_32;
1249 port->uart.uartclk = ioclk / 32;
1254 _debug("UARTCLK: %u / %hu", port->uart.uartclk, tmxbr);
1256 /* make the changes */
1257 spin_lock_irqsave(&port->uart.lock, flags);
1259 uart_update_timeout(&port->uart, new->c_cflag, baud);
1261 /* set the timer to produce the required baud rate */
1262 switch (div_timer) {
1263 case MNSCx_DIV_TIMER_16BIT:
1265 *port->_tmxbr = tmxbr;
1266 *port->_tmxmd = TM8MD_INIT_COUNTER;
1267 *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
1270 case MNSCx_DIV_TIMER_8BIT:
1272 *(volatile u8 *) port->_tmxbr = (u8) tmxbr;
1273 *port->_tmxmd = TM2MD_INIT_COUNTER;
1274 *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
1278 /* CTS flow control flag and modem status interrupts */
1279 scxctr &= ~(SC2CTR_TWE | SC2CTR_TWS);
1281 if (port->type == PORT_MN10300_CTS && cflag & CRTSCTS) {
1282 /* want to interrupt when CTS goes low if CTS is now
1283 * high and vice versa
1285 port->tx_cts = *port->_status;
1287 if (port->tx_cts & SC2STR_CTS)
1288 scxctr |= SC2CTR_TWE;
1290 scxctr |= SC2CTR_TWE | SC2CTR_TWS;
1293 /* set up parity check flag */
1294 port->uart.read_status_mask = (1 << TTY_NORMAL) | (1 << TTY_OVERRUN);
1295 if (new->c_iflag & INPCK)
1296 port->uart.read_status_mask |=
1297 (1 << TTY_PARITY) | (1 << TTY_FRAME);
1298 if (new->c_iflag & (BRKINT | PARMRK))
1299 port->uart.read_status_mask |= (1 << TTY_BREAK);
1301 /* characters to ignore */
1302 port->uart.ignore_status_mask = 0;
1303 if (new->c_iflag & IGNPAR)
1304 port->uart.ignore_status_mask |=
1305 (1 << TTY_PARITY) | (1 << TTY_FRAME);
1306 if (new->c_iflag & IGNBRK) {
1307 port->uart.ignore_status_mask |= (1 << TTY_BREAK);
1309 * If we're ignoring parity and break indicators,
1310 * ignore overruns to (for real raw support).
1312 if (new->c_iflag & IGNPAR)
1313 port->uart.ignore_status_mask |= (1 << TTY_OVERRUN);
1316 /* Ignore all characters if CREAD is not set */
1317 if ((new->c_cflag & CREAD) == 0)
1318 port->uart.ignore_status_mask |= (1 << TTY_NORMAL);
1320 scxctr |= *port->_control & (SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
1321 *port->_control = scxctr;
1323 spin_unlock_irqrestore(&port->uart.lock, flags);
1327 * set the terminal I/O parameters
1329 static void mn10300_serial_set_termios(struct uart_port *_port,
1330 struct ktermios *new,
1331 struct ktermios *old)
1333 struct mn10300_serial_port *port =
1334 container_of(_port, struct mn10300_serial_port, uart);
1336 _enter("%s,%p,%p", port->name, new, old);
1338 mn10300_serial_change_speed(port, new, old);
1340 /* handle turning off CRTSCTS */
1341 if (!(new->c_cflag & CRTSCTS)) {
1342 u16 ctr = *port->_control;
1344 *port->_control = ctr;
1347 /* change Transfer bit-order (LSB/MSB) */
1348 if (new->c_cflag & CODMSB)
1349 *port->_control |= SC01CTR_OD_MSBFIRST; /* MSB MODE */
1351 *port->_control &= ~SC01CTR_OD_MSBFIRST; /* LSB MODE */
1355 * return description of port type
1357 static const char *mn10300_serial_type(struct uart_port *_port)
1359 struct mn10300_serial_port *port =
1360 container_of(_port, struct mn10300_serial_port, uart);
1362 if (port->uart.type == PORT_MN10300_CTS)
1363 return "MN10300 SIF_CTS";
1365 return "MN10300 SIF";
1369 * release I/O and memory regions in use by port
1371 static void mn10300_serial_release_port(struct uart_port *_port)
1373 struct mn10300_serial_port *port =
1374 container_of(_port, struct mn10300_serial_port, uart);
1376 _enter("%s", port->name);
1378 release_mem_region((unsigned long) port->_iobase, 16);
1382 * request I/O and memory regions for port
1384 static int mn10300_serial_request_port(struct uart_port *_port)
1386 struct mn10300_serial_port *port =
1387 container_of(_port, struct mn10300_serial_port, uart);
1389 _enter("%s", port->name);
1391 request_mem_region((unsigned long) port->_iobase, 16, port->name);
1396 * configure the type and reserve the ports
1398 static void mn10300_serial_config_port(struct uart_port *_port, int type)
1400 struct mn10300_serial_port *port =
1401 container_of(_port, struct mn10300_serial_port, uart);
1403 _enter("%s", port->name);
1405 port->uart.type = PORT_MN10300;
1407 if (port->options & MNSCx_OPT_CTS)
1408 port->uart.type = PORT_MN10300_CTS;
1410 mn10300_serial_request_port(_port);
1414 * verify serial parameters are suitable for this port type
1416 static int mn10300_serial_verify_port(struct uart_port *_port,
1417 struct serial_struct *ss)
1419 struct mn10300_serial_port *port =
1420 container_of(_port, struct mn10300_serial_port, uart);
1421 void *mapbase = (void *) (unsigned long) port->uart.mapbase;
1423 _enter("%s", port->name);
1425 /* these things may not be changed */
1426 if (ss->irq != port->uart.irq ||
1427 ss->port != port->uart.iobase ||
1428 ss->io_type != port->uart.iotype ||
1429 ss->iomem_base != mapbase ||
1430 ss->iomem_reg_shift != port->uart.regshift ||
1431 ss->hub6 != port->uart.hub6 ||
1432 ss->xmit_fifo_size != port->uart.fifosize)
1435 /* type may be changed on a port that supports CTS */
1436 if (ss->type != port->uart.type) {
1437 if (!(port->options & MNSCx_OPT_CTS))
1440 if (ss->type != PORT_MN10300 &&
1441 ss->type != PORT_MN10300_CTS)
1449 * initialise the MN10300 on-chip UARTs
1451 static int __init mn10300_serial_init(void)
1453 struct mn10300_serial_port *port;
1456 printk(KERN_INFO "%s version %s (%s)\n",
1457 serial_name, serial_version, serial_revdate);
1459 #if defined(CONFIG_MN10300_TTYSM2) && defined(CONFIG_AM33_2)
1462 SC2TIM = 8; /* make the baud base of timer 2 IOCLK/8 */
1467 set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL),
1468 mn10300_serial_vdma_interrupt);
1470 ret = uart_register_driver(&mn10300_serial_driver);
1472 for (i = 0 ; i < NR_PORTS ; i++) {
1473 port = mn10300_serial_ports[i];
1474 if (!port || port->gdbstub)
1477 switch (port->clock_src) {
1478 case MNSCx_CLOCK_SRC_IOCLK:
1479 port->ioclk = MN10300_IOCLK;
1482 #ifdef MN10300_IOBCLK
1483 case MNSCx_CLOCK_SRC_IOBCLK:
1484 port->ioclk = MN10300_IOBCLK;
1491 ret = uart_add_one_port(&mn10300_serial_driver,
1495 _debug("ERROR %d", -ret);
1501 uart_unregister_driver(&mn10300_serial_driver);
1507 __initcall(mn10300_serial_init);
1510 #ifdef CONFIG_MN10300_TTYSM_CONSOLE
1513 * print a string to the serial port without disturbing the real user of the
1515 * - the console must be locked by the caller
1517 static void mn10300_serial_console_write(struct console *co,
1518 const char *s, unsigned count)
1520 struct mn10300_serial_port *port;
1522 u16 scxctr, txicr, tmp;
1525 port = mn10300_serial_ports[co->index];
1527 /* firstly hijack the serial port from the "virtual DMA" controller */
1529 txicr = *port->tx_icr;
1530 *port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL);
1531 tmp = *port->tx_icr;
1534 /* the transmitter may be disabled */
1535 scxctr = *port->_control;
1536 if (!(scxctr & SC01CTR_TXE)) {
1537 /* restart the UART clock */
1538 tmxmd = *port->_tmxmd;
1540 switch (port->div_timer) {
1541 case MNSCx_DIV_TIMER_16BIT:
1543 *port->_tmxmd = TM8MD_INIT_COUNTER;
1544 *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
1547 case MNSCx_DIV_TIMER_8BIT:
1549 *port->_tmxmd = TM2MD_INIT_COUNTER;
1550 *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
1554 /* enable the transmitter */
1555 *port->_control = (scxctr & ~SC01CTR_BKE) | SC01CTR_TXE;
1557 } else if (scxctr & SC01CTR_BKE) {
1558 /* stop transmitting BREAK */
1559 *port->_control = (scxctr & ~SC01CTR_BKE);
1562 /* send the chars into the serial port (with LF -> LFCR conversion) */
1563 for (i = 0; i < count; i++) {
1566 while (*port->_status & SC01STR_TBF)
1568 *(u8 *) port->_txb = ch;
1571 while (*port->_status & SC01STR_TBF)
1573 *(u8 *) port->_txb = 0xd;
1577 /* can't let the transmitter be turned off if it's actually
1579 while (*port->_status & (SC01STR_TXF | SC01STR_TBF))
1582 /* disable the transmitter if we re-enabled it */
1583 if (!(scxctr & SC01CTR_TXE))
1584 *port->_control = scxctr;
1587 *port->tx_icr = txicr;
1588 tmp = *port->tx_icr;
1593 * set up a serial port as a console
1594 * - construct a cflag setting for the first rs_open()
1595 * - initialize the serial port
1596 * - return non-zero if we didn't find a serial port.
1598 static int __init mn10300_serial_console_setup(struct console *co,
1601 struct mn10300_serial_port *port;
1602 int i, parity = 'n', baud = 9600, bits = 8, flow = 0;
1604 for (i = 0 ; i < NR_PORTS ; i++) {
1605 port = mn10300_serial_ports[i];
1606 if (port && !port->gdbstub && port->uart.line == co->index)
1613 switch (port->clock_src) {
1614 case MNSCx_CLOCK_SRC_IOCLK:
1615 port->ioclk = MN10300_IOCLK;
1618 #ifdef MN10300_IOBCLK
1619 case MNSCx_CLOCK_SRC_IOBCLK:
1620 port->ioclk = MN10300_IOBCLK;
1628 uart_parse_options(options, &baud, &parity, &bits, &flow);
1630 return uart_set_options(&port->uart, co, baud, parity, bits, flow);
1636 static int __init mn10300_serial_console_init(void)
1638 register_console(&mn10300_serial_console);
1642 console_initcall(mn10300_serial_console_init);
1645 #ifdef CONFIG_CONSOLE_POLL
1647 * Polled character reception for the kernel debugger
1649 static int mn10300_serial_poll_get_char(struct uart_port *_port)
1651 struct mn10300_serial_port *port =
1652 container_of(_port, struct mn10300_serial_port, uart);
1656 _enter("%s", port->name);
1659 /* pull chars out of the hat */
1661 if (ix == port->rx_inp)
1662 return NO_POLL_CHAR;
1664 ch = port->rx_buffer[ix++];
1665 st = port->rx_buffer[ix++];
1667 port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
1669 } while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF));
1676 * Polled character transmission for the kernel debugger
1678 static void mn10300_serial_poll_put_char(struct uart_port *_port,
1681 struct mn10300_serial_port *port =
1682 container_of(_port, struct mn10300_serial_port, uart);
1685 /* wait for the transmitter to finish anything it might be doing (and
1686 * this includes the virtual DMA handler, so it might take a while) */
1687 while (*port->_status & (SC01STR_TBF | SC01STR_TXF))
1690 /* disable the Tx ready interrupt */
1691 intr = *port->_intr;
1692 *port->_intr = intr & ~SC01ICR_TI;
1696 *(u8 *) port->_txb = 0x0d;
1697 while (*port->_status & SC01STR_TBF)
1701 *(u8 *) port->_txb = ch;
1702 while (*port->_status & SC01STR_TBF)
1705 /* restore the Tx interrupt flag */
1706 *port->_intr = intr;
1710 #endif /* CONFIG_CONSOLE_POLL */