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/version.h>
21 #include <linux/module.h>
22 #include <linux/serial.h>
23 #include <linux/circ_buf.h>
24 #include <linux/errno.h>
25 #include <linux/signal.h>
26 #include <linux/sched.h>
27 #include <linux/timer.h>
28 #include <linux/interrupt.h>
29 #include <linux/tty.h>
30 #include <linux/tty_flip.h>
31 #include <linux/major.h>
32 #include <linux/string.h>
33 #include <linux/ioport.h>
35 #include <linux/slab.h>
36 #include <linux/init.h>
37 #include <linux/console.h>
38 #include <linux/sysrq.h>
40 #include <asm/system.h>
43 #include <asm/bitops.h>
44 #include <asm/serial-regs.h>
45 #include <asm/unit/timex.h>
46 #include "mn10300-serial.h"
48 static inline __attribute__((format(printf, 1, 2)))
49 void no_printk(const char *fmt, ...)
53 #define kenter(FMT, ...) \
54 printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__)
55 #define _enter(FMT, ...) \
56 no_printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__)
57 #define kdebug(FMT, ...) \
58 printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__)
59 #define _debug(FMT, ...) \
60 no_printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__)
61 #define kproto(FMT, ...) \
62 printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__)
63 #define _proto(FMT, ...) \
64 no_printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__)
68 #ifdef CONFIG_MN10300_TTYSM_CONSOLE
69 static void mn10300_serial_console_write(struct console *co,
70 const char *s, unsigned count);
71 static int __init mn10300_serial_console_setup(struct console *co,
74 static struct uart_driver mn10300_serial_driver;
75 static struct console mn10300_serial_console = {
77 .write = mn10300_serial_console_write,
78 .device = uart_console_device,
79 .setup = mn10300_serial_console_setup,
80 .flags = CON_PRINTBUFFER,
82 .data = &mn10300_serial_driver,
86 static struct uart_driver mn10300_serial_driver = {
88 .driver_name = "mn10300-serial",
93 #ifdef CONFIG_MN10300_TTYSM_CONSOLE
94 .cons = &mn10300_serial_console,
98 static unsigned int mn10300_serial_tx_empty(struct uart_port *);
99 static void mn10300_serial_set_mctrl(struct uart_port *, unsigned int mctrl);
100 static unsigned int mn10300_serial_get_mctrl(struct uart_port *);
101 static void mn10300_serial_stop_tx(struct uart_port *);
102 static void mn10300_serial_start_tx(struct uart_port *);
103 static void mn10300_serial_send_xchar(struct uart_port *, char ch);
104 static void mn10300_serial_stop_rx(struct uart_port *);
105 static void mn10300_serial_enable_ms(struct uart_port *);
106 static void mn10300_serial_break_ctl(struct uart_port *, int ctl);
107 static int mn10300_serial_startup(struct uart_port *);
108 static void mn10300_serial_shutdown(struct uart_port *);
109 static void mn10300_serial_set_termios(struct uart_port *,
110 struct ktermios *new,
111 struct ktermios *old);
112 static const char *mn10300_serial_type(struct uart_port *);
113 static void mn10300_serial_release_port(struct uart_port *);
114 static int mn10300_serial_request_port(struct uart_port *);
115 static void mn10300_serial_config_port(struct uart_port *, int);
116 static int mn10300_serial_verify_port(struct uart_port *,
117 struct serial_struct *);
119 static const struct uart_ops mn10300_serial_ops = {
120 .tx_empty = mn10300_serial_tx_empty,
121 .set_mctrl = mn10300_serial_set_mctrl,
122 .get_mctrl = mn10300_serial_get_mctrl,
123 .stop_tx = mn10300_serial_stop_tx,
124 .start_tx = mn10300_serial_start_tx,
125 .send_xchar = mn10300_serial_send_xchar,
126 .stop_rx = mn10300_serial_stop_rx,
127 .enable_ms = mn10300_serial_enable_ms,
128 .break_ctl = mn10300_serial_break_ctl,
129 .startup = mn10300_serial_startup,
130 .shutdown = mn10300_serial_shutdown,
131 .set_termios = mn10300_serial_set_termios,
132 .type = mn10300_serial_type,
133 .release_port = mn10300_serial_release_port,
134 .request_port = mn10300_serial_request_port,
135 .config_port = mn10300_serial_config_port,
136 .verify_port = mn10300_serial_verify_port,
139 static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
142 * the first on-chip serial port: ttySM0 (aka SIF0)
144 #ifdef CONFIG_MN10300_TTYSM0
145 struct mn10300_serial_port mn10300_serial_port_sif0 = {
146 .uart.ops = &mn10300_serial_ops,
147 .uart.membase = (void __iomem *) &SC0CTR,
148 .uart.mapbase = (unsigned long) &SC0CTR,
149 .uart.iotype = UPIO_MEM,
151 .uart.uartclk = 0, /* MN10300_IOCLK, */
153 .uart.flags = UPF_BOOT_AUTOCONF,
155 .uart.type = PORT_MN10300,
157 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif0.uart.lock),
161 ._status = (volatile u8 *) &SC0STR,
165 .rx_name = "ttySM0/Rx",
166 .tx_name = "ttySM0/Tx",
167 #ifdef CONFIG_MN10300_TTYSM0_TIMER8
168 .tm_name = "ttySM0/Timer8",
173 .div_timer = MNSCx_DIV_TIMER_16BIT,
174 #else /* CONFIG_MN10300_TTYSM0_TIMER2 */
175 .tm_name = "ttySM0/Timer2",
177 ._tmxbr = (volatile u16 *) &TM2BR,
180 .div_timer = MNSCx_DIV_TIMER_8BIT,
184 .rx_icr = &GxICR(SC0RXIRQ),
185 .tx_icr = &GxICR(SC0TXIRQ),
186 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
188 #ifdef CONFIG_GDBSTUB_ON_TTYSM0
192 #endif /* CONFIG_MN10300_TTYSM0 */
195 * the second on-chip serial port: ttySM1 (aka SIF1)
197 #ifdef CONFIG_MN10300_TTYSM1
198 struct mn10300_serial_port mn10300_serial_port_sif1 = {
199 .uart.ops = &mn10300_serial_ops,
200 .uart.membase = (void __iomem *) &SC1CTR,
201 .uart.mapbase = (unsigned long) &SC1CTR,
202 .uart.iotype = UPIO_MEM,
204 .uart.uartclk = 0, /* MN10300_IOCLK, */
206 .uart.flags = UPF_BOOT_AUTOCONF,
208 .uart.type = PORT_MN10300,
210 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif1.uart.lock),
214 ._status = (volatile u8 *) &SC1STR,
218 .rx_name = "ttySM1/Rx",
219 .tx_name = "ttySM1/Tx",
220 #ifdef CONFIG_MN10300_TTYSM1_TIMER9
221 .tm_name = "ttySM1/Timer9",
226 .div_timer = MNSCx_DIV_TIMER_16BIT,
227 #else /* CONFIG_MN10300_TTYSM1_TIMER3 */
228 .tm_name = "ttySM1/Timer3",
230 ._tmxbr = (volatile u16 *) &TM3BR,
233 .div_timer = MNSCx_DIV_TIMER_8BIT,
237 .rx_icr = &GxICR(SC1RXIRQ),
238 .tx_icr = &GxICR(SC1TXIRQ),
239 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
241 #ifdef CONFIG_GDBSTUB_ON_TTYSM1
245 #endif /* CONFIG_MN10300_TTYSM1 */
248 * the third on-chip serial port: ttySM2 (aka SIF2)
250 #ifdef CONFIG_MN10300_TTYSM2
251 struct mn10300_serial_port mn10300_serial_port_sif2 = {
252 .uart.ops = &mn10300_serial_ops,
253 .uart.membase = (void __iomem *) &SC2CTR,
254 .uart.mapbase = (unsigned long) &SC2CTR,
255 .uart.iotype = UPIO_MEM,
257 .uart.uartclk = 0, /* MN10300_IOCLK, */
259 .uart.flags = UPF_BOOT_AUTOCONF,
261 #ifdef CONFIG_MN10300_TTYSM2_CTS
262 .uart.type = PORT_MN10300_CTS,
264 .uart.type = PORT_MN10300,
267 __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif2.uart.lock),
269 .rx_name = "ttySM2/Rx",
270 .tx_name = "ttySM2/Tx",
271 .tm_name = "ttySM2/Timer10",
282 .div_timer = MNSCx_DIV_TIMER_16BIT,
285 .rx_icr = &GxICR(SC2RXIRQ),
286 .tx_icr = &GxICR(SC2TXIRQ),
287 .clock_src = MNSCx_CLOCK_SRC_IOCLK,
288 #ifdef CONFIG_MN10300_TTYSM2_CTS
289 .options = MNSCx_OPT_CTS,
293 #ifdef CONFIG_GDBSTUB_ON_TTYSM2
297 #endif /* CONFIG_MN10300_TTYSM2 */
301 * list of available serial ports
303 struct mn10300_serial_port *mn10300_serial_ports[NR_UARTS + 1] = {
304 #ifdef CONFIG_MN10300_TTYSM0
305 [0] = &mn10300_serial_port_sif0,
307 #ifdef CONFIG_MN10300_TTYSM1
308 [1] = &mn10300_serial_port_sif1,
310 #ifdef CONFIG_MN10300_TTYSM2
311 [2] = &mn10300_serial_port_sif2,
318 * we abuse the serial ports' baud timers' interrupt lines to get the ability
319 * to deliver interrupts to userspace as we use the ports' interrupt lines to
320 * do virtual DMA on account of the ports having no hardware FIFOs
322 * we can generate an interrupt manually in the assembly stubs by writing to
323 * the enable and detect bits in the interrupt control register, so all we need
324 * to do here is disable the interrupt line
326 * note that we can't just leave the line enabled as the baud rate timer *also*
327 * generates interrupts
329 static void mn10300_serial_mask_ack(unsigned int irq)
332 GxICR(irq) = GxICR_LEVEL_6;
333 tmp = GxICR(irq); /* flush write buffer */
336 static void mn10300_serial_nop(unsigned int irq)
340 static struct irq_chip mn10300_serial_pic = {
342 .ack = mn10300_serial_mask_ack,
343 .mask = mn10300_serial_mask_ack,
344 .mask_ack = mn10300_serial_mask_ack,
345 .unmask = mn10300_serial_nop,
346 .end = mn10300_serial_nop,
351 * serial virtual DMA interrupt jump table
353 struct mn10300_serial_int mn10300_serial_int_tbl[NR_IRQS];
355 static void mn10300_serial_dis_tx_intr(struct mn10300_serial_port *port)
358 *port->tx_icr = GxICR_LEVEL_1 | GxICR_DETECT;
362 static void mn10300_serial_en_tx_intr(struct mn10300_serial_port *port)
365 *port->tx_icr = GxICR_LEVEL_1 | GxICR_ENABLE;
369 static void mn10300_serial_dis_rx_intr(struct mn10300_serial_port *port)
372 *port->rx_icr = GxICR_LEVEL_1 | GxICR_DETECT;
377 * multi-bit equivalent of test_and_clear_bit()
379 static int mask_test_and_clear(volatile u8 *ptr, u8 mask)
382 asm volatile(" bclr %1,(%2) \n"
384 : "=d"(epsw) : "d"(mask), "a"(ptr));
385 return !(epsw & EPSW_FLAG_Z);
389 * receive chars from the ring buffer for this serial port
390 * - must do break detection here (not done in the UART)
392 static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port)
394 struct uart_icount *icount = &port->uart.icount;
395 struct tty_struct *tty = port->uart.info->port.tty;
398 u8 st, ch, push, status, overrun;
400 _enter("%s", port->name);
404 count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE);
405 count = tty_buffer_request_room(tty, count);
407 if (!tty->low_latency)
408 tty_flip_buffer_push(tty);
413 /* pull chars out of the hat */
415 if (ix == port->rx_inp) {
416 if (push && !tty->low_latency)
417 tty_flip_buffer_push(tty);
421 ch = port->rx_buffer[ix++];
422 st = port->rx_buffer[ix++];
424 port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
425 port->uart.icount.rx++;
427 st &= SC01STR_FEF | SC01STR_PEF | SC01STR_OEF;
431 /* the UART doesn't detect BREAK, so we have to do that ourselves
432 * - it starts as a framing error on a NUL character
433 * - then we count another two NUL characters before issuing TTY_BREAK
434 * - then we end on a normal char or one that has all the bottom bits
435 * zero and the top bits set
437 switch (port->rx_brk) {
439 /* not breaking at the moment */
443 if (st & SC01STR_FEF && ch == 0) {
450 if (st & SC01STR_FEF && ch == 0) {
452 _proto("Rx Break Detected");
454 if (uart_handle_break(&port->uart))
456 status |= 1 << TTY_BREAK;
462 if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF))
463 goto try_again; /* still breaking */
465 port->rx_brk = 0; /* end of the break */
477 /* discard char at probable break end */
484 /* handle framing error */
485 if (st & SC01STR_FEF) {
487 /* framing error with NUL char is probably a BREAK */
492 _proto("Rx Framing Error");
494 status |= 1 << TTY_FRAME;
497 /* handle parity error */
498 if (st & SC01STR_PEF) {
499 _proto("Rx Parity Error");
504 /* handle normal char */
506 if (uart_handle_sysrq_char(&port->uart, ch))
508 status = (1 << TTY_NORMAL);
511 /* handle overrun error */
512 if (st & SC01STR_OEF) {
516 _proto("Rx Overrun Error");
522 status &= port->uart.read_status_mask;
524 if (!overrun && !(status & port->uart.ignore_status_mask)) {
527 if (status & (1 << TTY_BREAK))
529 else if (status & (1 << TTY_PARITY))
531 else if (status & (1 << TTY_FRAME))
536 tty_insert_flip_char(tty, ch, flag);
539 /* overrun is special, since it's reported immediately, and doesn't
540 * affect the current character
543 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
547 if (!tty->low_latency)
548 tty_flip_buffer_push(tty);
562 * handle an interrupt from the serial transmission "virtual DMA" driver
563 * - note: the interrupt routine will disable its own interrupts when the Tx
566 static void mn10300_serial_transmit_interrupt(struct mn10300_serial_port *port)
568 _enter("%s", port->name);
570 if (uart_tx_stopped(&port->uart) ||
571 uart_circ_empty(&port->uart.info->xmit))
572 mn10300_serial_dis_tx_intr(port);
574 if (uart_circ_chars_pending(&port->uart.info->xmit) < WAKEUP_CHARS)
575 uart_write_wakeup(&port->uart);
579 * deal with a change in the status of the CTS line
581 static void mn10300_serial_cts_changed(struct mn10300_serial_port *port, u8 st)
586 port->uart.icount.cts++;
588 /* flip the CTS state selector flag to interrupt when it changes
590 ctr = *port->_control;
592 *port->_control = ctr;
594 uart_handle_cts_change(&port->uart, st & SC2STR_CTS);
595 wake_up_interruptible(&port->uart.info->delta_msr_wait);
599 * handle a virtual interrupt generated by the lower level "virtual DMA"
600 * routines (irq is the baud timer interrupt)
602 static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id)
604 struct mn10300_serial_port *port = dev_id;
607 spin_lock(&port->uart.lock);
609 if (port->intr_flags) {
610 _debug("INT %s: %x", port->name, port->intr_flags);
612 if (mask_test_and_clear(&port->intr_flags, MNSCx_RX_AVAIL))
613 mn10300_serial_receive_interrupt(port);
615 if (mask_test_and_clear(&port->intr_flags,
616 MNSCx_TX_SPACE | MNSCx_TX_EMPTY))
617 mn10300_serial_transmit_interrupt(port);
620 /* the only modem control line amongst the whole lot is CTS on
622 if (port->type == PORT_MN10300_CTS) {
624 if ((port->tx_cts ^ st) & SC2STR_CTS)
625 mn10300_serial_cts_changed(port, st);
628 spin_unlock(&port->uart.lock);
634 * return indication of whether the hardware transmit buffer is empty
636 static unsigned int mn10300_serial_tx_empty(struct uart_port *_port)
638 struct mn10300_serial_port *port =
639 container_of(_port, struct mn10300_serial_port, uart);
641 _enter("%s", port->name);
643 return (*port->_status & (SC01STR_TXF | SC01STR_TBF)) ?
648 * set the modem control lines (we don't have any)
650 static void mn10300_serial_set_mctrl(struct uart_port *_port,
653 struct mn10300_serial_port *port =
654 container_of(_port, struct mn10300_serial_port, uart);
656 _enter("%s,%x", port->name, mctrl);
660 * get the modem control line statuses
662 static unsigned int mn10300_serial_get_mctrl(struct uart_port *_port)
664 struct mn10300_serial_port *port =
665 container_of(_port, struct mn10300_serial_port, uart);
667 _enter("%s", port->name);
669 if (port->type == PORT_MN10300_CTS && !(*port->_status & SC2STR_CTS))
670 return TIOCM_CAR | TIOCM_DSR;
672 return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR;
676 * stop transmitting characters
678 static void mn10300_serial_stop_tx(struct uart_port *_port)
680 struct mn10300_serial_port *port =
681 container_of(_port, struct mn10300_serial_port, uart);
683 _enter("%s", port->name);
685 /* disable the virtual DMA */
686 mn10300_serial_dis_tx_intr(port);
690 * start transmitting characters
691 * - jump-start transmission if it has stalled
692 * - enable the serial Tx interrupt (used by the virtual DMA controller)
693 * - force an interrupt to happen if necessary
695 static void mn10300_serial_start_tx(struct uart_port *_port)
697 struct mn10300_serial_port *port =
698 container_of(_port, struct mn10300_serial_port, uart);
704 CIRC_CNT(&port->uart.info->xmit.head,
705 &port->uart.info->xmit.tail,
708 /* kick the virtual DMA controller */
712 if (*port->_status & SC01STR_TBF)
713 x &= ~(GxICR_REQUEST | GxICR_DETECT);
715 x |= GxICR_REQUEST | GxICR_DETECT;
717 _debug("CTR=%04hx ICR=%02hx STR=%04x TMD=%02hx TBR=%04hx ICR=%04hx",
718 *port->_control, *port->_intr, *port->_status,
719 *port->_tmxmd, *port->_tmxbr, *port->tx_icr);
726 * transmit a high-priority XON/XOFF character
728 static void mn10300_serial_send_xchar(struct uart_port *_port, char ch)
730 struct mn10300_serial_port *port =
731 container_of(_port, struct mn10300_serial_port, uart);
733 _enter("%s,%02x", port->name, ch);
735 if (likely(port->gdbstub)) {
738 mn10300_serial_en_tx_intr(port);
743 * stop receiving characters
744 * - called whilst the port is being closed
746 static void mn10300_serial_stop_rx(struct uart_port *_port)
748 struct mn10300_serial_port *port =
749 container_of(_port, struct mn10300_serial_port, uart);
753 _enter("%s", port->name);
755 ctr = *port->_control;
757 *port->_control = ctr;
759 mn10300_serial_dis_rx_intr(port);
763 * enable modem status interrupts
765 static void mn10300_serial_enable_ms(struct uart_port *_port)
767 struct mn10300_serial_port *port =
768 container_of(_port, struct mn10300_serial_port, uart);
772 _enter("%s", port->name);
774 if (port->type == PORT_MN10300_CTS) {
775 /* want to interrupt when CTS goes low if CTS is now high and
778 port->tx_cts = *port->_status;
780 cts = (port->tx_cts & SC2STR_CTS) ?
781 SC2CTR_TWE : SC2CTR_TWE | SC2CTR_TWS;
783 ctr = *port->_control;
786 *port->_control = ctr;
788 mn10300_serial_en_tx_intr(port);
793 * transmit or cease transmitting a break signal
795 static void mn10300_serial_break_ctl(struct uart_port *_port, int ctl)
797 struct mn10300_serial_port *port =
798 container_of(_port, struct mn10300_serial_port, uart);
800 _enter("%s,%d", port->name, ctl);
803 /* tell the virtual DMA handler to assert BREAK */
805 mn10300_serial_en_tx_intr(port);
808 *port->_control &= ~SC01CTR_BKE;
809 mn10300_serial_en_tx_intr(port);
814 * grab the interrupts and enable the port for reception
816 static int mn10300_serial_startup(struct uart_port *_port)
818 struct mn10300_serial_port *port =
819 container_of(_port, struct mn10300_serial_port, uart);
820 struct mn10300_serial_int *pint;
822 _enter("%s{%d}", port->name, port->gdbstub);
824 if (unlikely(port->gdbstub))
827 /* allocate an Rx buffer for the virtual DMA handler */
828 port->rx_buffer = kmalloc(MNSC_BUFFER_SIZE, GFP_KERNEL);
829 if (!port->rx_buffer)
832 port->rx_inp = port->rx_outp = 0;
834 /* finally, enable the device */
835 *port->_intr = SC01ICR_TI;
836 *port->_control |= SC01CTR_TXE | SC01CTR_RXE;
838 pint = &mn10300_serial_int_tbl[port->rx_irq];
840 pint->vdma = mn10300_serial_vdma_rx_handler;
841 pint = &mn10300_serial_int_tbl[port->tx_irq];
843 pint->vdma = mn10300_serial_vdma_tx_handler;
845 set_intr_level(port->rx_irq, GxICR_LEVEL_1);
846 set_intr_level(port->tx_irq, GxICR_LEVEL_1);
847 set_irq_chip(port->tm_irq, &mn10300_serial_pic);
849 if (request_irq(port->rx_irq, mn10300_serial_interrupt,
850 IRQF_DISABLED, port->rx_name, port) < 0)
853 if (request_irq(port->tx_irq, mn10300_serial_interrupt,
854 IRQF_DISABLED, port->tx_name, port) < 0)
857 if (request_irq(port->tm_irq, mn10300_serial_interrupt,
858 IRQF_DISABLED, port->tm_name, port) < 0)
860 mn10300_serial_mask_ack(port->tm_irq);
865 free_irq(port->tx_irq, port);
867 free_irq(port->rx_irq, port);
869 kfree(port->rx_buffer);
870 port->rx_buffer = NULL;
875 * shutdown the port and release interrupts
877 static void mn10300_serial_shutdown(struct uart_port *_port)
879 struct mn10300_serial_port *port =
880 container_of(_port, struct mn10300_serial_port, uart);
882 _enter("%s", port->name);
884 /* disable the serial port and its baud rate timer */
886 *port->_control &= ~(SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
889 if (port->rx_buffer) {
890 void *buf = port->rx_buffer;
891 port->rx_buffer = NULL;
895 /* disable all intrs */
896 free_irq(port->tm_irq, port);
897 free_irq(port->rx_irq, port);
898 free_irq(port->tx_irq, port);
900 *port->rx_icr = GxICR_LEVEL_1;
901 *port->tx_icr = GxICR_LEVEL_1;
905 * this routine is called to set the UART divisor registers to match the
906 * specified baud rate for a serial port.
908 static void mn10300_serial_change_speed(struct mn10300_serial_port *port,
909 struct ktermios *new,
910 struct ktermios *old)
913 unsigned long ioclk = port->ioclk;
915 int baud, bits, xdiv, tmp;
918 u8 div_timer = port->div_timer;
920 _enter("%s{%lu}", port->name, ioclk);
922 /* byte size and parity */
923 cflag = new->c_cflag;
924 switch (cflag & CSIZE) {
925 case CS7: scxctr = SC01CTR_CLN_7BIT; bits = 9; break;
926 case CS8: scxctr = SC01CTR_CLN_8BIT; bits = 10; break;
927 default: scxctr = SC01CTR_CLN_8BIT; bits = 10; break;
930 if (cflag & CSTOPB) {
931 scxctr |= SC01CTR_STB_2BIT;
935 if (cflag & PARENB) {
938 scxctr |= SC01CTR_PB_ODD;
940 else if (cflag & CMSPAR)
941 scxctr |= SC01CTR_PB_FIXED0;
944 scxctr |= SC01CTR_PB_EVEN;
947 /* Determine divisor based on baud rate */
950 if (div_timer == MNSCx_DIV_TIMER_16BIT)
951 scxctr |= SC0CTR_CK_TM8UFLOW_8; /* ( == SC1CTR_CK_TM9UFLOW_8
952 * == SC2CTR_CK_TM10UFLOW) */
953 else if (div_timer == MNSCx_DIV_TIMER_8BIT)
954 scxctr |= SC0CTR_CK_TM2UFLOW_8;
957 baud = uart_get_baud_rate(&port->uart, new, old, 0,
960 _debug("ALT %d [baud %d]", battempt, baud);
963 baud = 9600; /* B0 transition handled in rs_set_termios */
966 baud = 269; /* 134 is really 134.5 */
971 (port->uart.flags & UPF_SPD_MASK) == UPF_SPD_CUST
973 _debug("CUSTOM %u", port->uart.custom_divisor);
975 if (div_timer == MNSCx_DIV_TIMER_16BIT) {
976 if (port->uart.custom_divisor <= 65535) {
977 tmxmd = TM8MD_SRC_IOCLK;
978 tmxbr = port->uart.custom_divisor;
979 port->uart.uartclk = ioclk;
982 if (port->uart.custom_divisor / 8 <= 65535) {
983 tmxmd = TM8MD_SRC_IOCLK_8;
984 tmxbr = port->uart.custom_divisor / 8;
985 port->uart.custom_divisor = tmxbr * 8;
986 port->uart.uartclk = ioclk / 8;
989 if (port->uart.custom_divisor / 32 <= 65535) {
990 tmxmd = TM8MD_SRC_IOCLK_32;
991 tmxbr = port->uart.custom_divisor / 32;
992 port->uart.custom_divisor = tmxbr * 32;
993 port->uart.uartclk = ioclk / 32;
997 } else if (div_timer == MNSCx_DIV_TIMER_8BIT) {
998 if (port->uart.custom_divisor <= 255) {
999 tmxmd = TM2MD_SRC_IOCLK;
1000 tmxbr = port->uart.custom_divisor;
1001 port->uart.uartclk = ioclk;
1004 if (port->uart.custom_divisor / 8 <= 255) {
1005 tmxmd = TM2MD_SRC_IOCLK_8;
1006 tmxbr = port->uart.custom_divisor / 8;
1007 port->uart.custom_divisor = tmxbr * 8;
1008 port->uart.uartclk = ioclk / 8;
1011 if (port->uart.custom_divisor / 32 <= 255) {
1012 tmxmd = TM2MD_SRC_IOCLK_32;
1013 tmxbr = port->uart.custom_divisor / 32;
1014 port->uart.custom_divisor = tmxbr * 32;
1015 port->uart.uartclk = ioclk / 32;
1021 switch (div_timer) {
1022 case MNSCx_DIV_TIMER_16BIT:
1023 port->uart.uartclk = ioclk;
1024 tmxmd = TM8MD_SRC_IOCLK;
1025 tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
1026 if (tmp > 0 && tmp <= 65535)
1029 port->uart.uartclk = ioclk / 8;
1030 tmxmd = TM8MD_SRC_IOCLK_8;
1031 tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
1032 if (tmp > 0 && tmp <= 65535)
1035 port->uart.uartclk = ioclk / 32;
1036 tmxmd = TM8MD_SRC_IOCLK_32;
1037 tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
1038 if (tmp > 0 && tmp <= 65535)
1042 case MNSCx_DIV_TIMER_8BIT:
1043 port->uart.uartclk = ioclk;
1044 tmxmd = TM2MD_SRC_IOCLK;
1045 tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1;
1046 if (tmp > 0 && tmp <= 255)
1049 port->uart.uartclk = ioclk / 8;
1050 tmxmd = TM2MD_SRC_IOCLK_8;
1051 tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1;
1052 if (tmp > 0 && tmp <= 255)
1055 port->uart.uartclk = ioclk / 32;
1056 tmxmd = TM2MD_SRC_IOCLK_32;
1057 tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1;
1058 if (tmp > 0 && tmp <= 255)
1067 /* refuse to change to a baud rate we can't support */
1068 _debug("CAN'T SUPPORT");
1073 new->c_cflag &= ~CBAUD;
1074 new->c_cflag |= (old->c_cflag & CBAUD);
1076 goto try_alternative;
1080 /* as a last resort, if the quotient is zero, default to 9600
1082 new->c_cflag &= ~CBAUD;
1083 new->c_cflag |= B9600;
1085 goto try_alternative;
1088 /* hmmm... can't seem to support 9600 either
1089 * - we could try iterating through the speeds we know about to
1092 new->c_cflag &= ~CBAUD;
1095 if (div_timer == MNSCx_DIV_TIMER_16BIT)
1096 tmxmd = TM8MD_SRC_IOCLK_32;
1097 else if (div_timer == MNSCx_DIV_TIMER_8BIT)
1098 tmxmd = TM2MD_SRC_IOCLK_32;
1101 port->uart.uartclk = ioclk / 32;
1106 _debug("UARTCLK: %u / %hu", port->uart.uartclk, tmxbr);
1108 /* make the changes */
1109 spin_lock_irqsave(&port->uart.lock, flags);
1111 uart_update_timeout(&port->uart, new->c_cflag, baud);
1113 /* set the timer to produce the required baud rate */
1114 switch (div_timer) {
1115 case MNSCx_DIV_TIMER_16BIT:
1117 *port->_tmxbr = tmxbr;
1118 *port->_tmxmd = TM8MD_INIT_COUNTER;
1119 *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
1122 case MNSCx_DIV_TIMER_8BIT:
1124 *(volatile u8 *) port->_tmxbr = (u8) tmxbr;
1125 *port->_tmxmd = TM2MD_INIT_COUNTER;
1126 *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
1130 /* CTS flow control flag and modem status interrupts */
1131 scxctr &= ~(SC2CTR_TWE | SC2CTR_TWS);
1133 if (port->type == PORT_MN10300_CTS && cflag & CRTSCTS) {
1134 /* want to interrupt when CTS goes low if CTS is now
1135 * high and vice versa
1137 port->tx_cts = *port->_status;
1139 if (port->tx_cts & SC2STR_CTS)
1140 scxctr |= SC2CTR_TWE;
1142 scxctr |= SC2CTR_TWE | SC2CTR_TWS;
1145 /* set up parity check flag */
1146 port->uart.read_status_mask = (1 << TTY_NORMAL) | (1 << TTY_OVERRUN);
1147 if (new->c_iflag & INPCK)
1148 port->uart.read_status_mask |=
1149 (1 << TTY_PARITY) | (1 << TTY_FRAME);
1150 if (new->c_iflag & (BRKINT | PARMRK))
1151 port->uart.read_status_mask |= (1 << TTY_BREAK);
1153 /* characters to ignore */
1154 port->uart.ignore_status_mask = 0;
1155 if (new->c_iflag & IGNPAR)
1156 port->uart.ignore_status_mask |=
1157 (1 << TTY_PARITY) | (1 << TTY_FRAME);
1158 if (new->c_iflag & IGNBRK) {
1159 port->uart.ignore_status_mask |= (1 << TTY_BREAK);
1161 * If we're ignoring parity and break indicators,
1162 * ignore overruns to (for real raw support).
1164 if (new->c_iflag & IGNPAR)
1165 port->uart.ignore_status_mask |= (1 << TTY_OVERRUN);
1168 /* Ignore all characters if CREAD is not set */
1169 if ((new->c_cflag & CREAD) == 0)
1170 port->uart.ignore_status_mask |= (1 << TTY_NORMAL);
1172 scxctr |= *port->_control & (SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE);
1173 *port->_control = scxctr;
1175 spin_unlock_irqrestore(&port->uart.lock, flags);
1179 * set the terminal I/O parameters
1181 static void mn10300_serial_set_termios(struct uart_port *_port,
1182 struct ktermios *new,
1183 struct ktermios *old)
1185 struct mn10300_serial_port *port =
1186 container_of(_port, struct mn10300_serial_port, uart);
1188 _enter("%s,%p,%p", port->name, new, old);
1190 mn10300_serial_change_speed(port, new, old);
1192 /* handle turning off CRTSCTS */
1193 if (!(new->c_cflag & CRTSCTS)) {
1194 u16 ctr = *port->_control;
1196 *port->_control = ctr;
1201 * return description of port type
1203 static const char *mn10300_serial_type(struct uart_port *_port)
1205 struct mn10300_serial_port *port =
1206 container_of(_port, struct mn10300_serial_port, uart);
1208 if (port->uart.type == PORT_MN10300_CTS)
1209 return "MN10300 SIF_CTS";
1211 return "MN10300 SIF";
1215 * release I/O and memory regions in use by port
1217 static void mn10300_serial_release_port(struct uart_port *_port)
1219 struct mn10300_serial_port *port =
1220 container_of(_port, struct mn10300_serial_port, uart);
1222 _enter("%s", port->name);
1224 release_mem_region((unsigned long) port->_iobase, 16);
1228 * request I/O and memory regions for port
1230 static int mn10300_serial_request_port(struct uart_port *_port)
1232 struct mn10300_serial_port *port =
1233 container_of(_port, struct mn10300_serial_port, uart);
1235 _enter("%s", port->name);
1237 request_mem_region((unsigned long) port->_iobase, 16, port->name);
1242 * configure the type and reserve the ports
1244 static void mn10300_serial_config_port(struct uart_port *_port, int type)
1246 struct mn10300_serial_port *port =
1247 container_of(_port, struct mn10300_serial_port, uart);
1249 _enter("%s", port->name);
1251 port->uart.type = PORT_MN10300;
1253 if (port->options & MNSCx_OPT_CTS)
1254 port->uart.type = PORT_MN10300_CTS;
1256 mn10300_serial_request_port(_port);
1260 * verify serial parameters are suitable for this port type
1262 static int mn10300_serial_verify_port(struct uart_port *_port,
1263 struct serial_struct *ss)
1265 struct mn10300_serial_port *port =
1266 container_of(_port, struct mn10300_serial_port, uart);
1267 void *mapbase = (void *) (unsigned long) port->uart.mapbase;
1269 _enter("%s", port->name);
1271 /* these things may not be changed */
1272 if (ss->irq != port->uart.irq ||
1273 ss->port != port->uart.iobase ||
1274 ss->io_type != port->uart.iotype ||
1275 ss->iomem_base != mapbase ||
1276 ss->iomem_reg_shift != port->uart.regshift ||
1277 ss->hub6 != port->uart.hub6 ||
1278 ss->xmit_fifo_size != port->uart.fifosize)
1281 /* type may be changed on a port that supports CTS */
1282 if (ss->type != port->uart.type) {
1283 if (!(port->options & MNSCx_OPT_CTS))
1286 if (ss->type != PORT_MN10300 &&
1287 ss->type != PORT_MN10300_CTS)
1295 * initialise the MN10300 on-chip UARTs
1297 static int __init mn10300_serial_init(void)
1299 struct mn10300_serial_port *port;
1302 printk(KERN_INFO "%s version %s (%s)\n",
1303 serial_name, serial_version, serial_revdate);
1305 #ifdef CONFIG_MN10300_TTYSM2
1306 SC2TIM = 8; /* make the baud base of timer 2 IOCLK/8 */
1309 set_intr_stub(EXCEP_IRQ_LEVEL1, mn10300_serial_vdma_interrupt);
1311 ret = uart_register_driver(&mn10300_serial_driver);
1313 for (i = 0 ; i < NR_PORTS ; i++) {
1314 port = mn10300_serial_ports[i];
1315 if (!port || port->gdbstub)
1318 switch (port->clock_src) {
1319 case MNSCx_CLOCK_SRC_IOCLK:
1320 port->ioclk = MN10300_IOCLK;
1323 #ifdef MN10300_IOBCLK
1324 case MNSCx_CLOCK_SRC_IOBCLK:
1325 port->ioclk = MN10300_IOBCLK;
1332 ret = uart_add_one_port(&mn10300_serial_driver,
1336 _debug("ERROR %d", -ret);
1342 uart_unregister_driver(&mn10300_serial_driver);
1348 __initcall(mn10300_serial_init);
1351 #ifdef CONFIG_MN10300_TTYSM_CONSOLE
1354 * print a string to the serial port without disturbing the real user of the
1356 * - the console must be locked by the caller
1358 static void mn10300_serial_console_write(struct console *co,
1359 const char *s, unsigned count)
1361 struct mn10300_serial_port *port;
1363 u16 scxctr, txicr, tmp;
1366 port = mn10300_serial_ports[co->index];
1368 /* firstly hijack the serial port from the "virtual DMA" controller */
1369 txicr = *port->tx_icr;
1370 *port->tx_icr = GxICR_LEVEL_1;
1371 tmp = *port->tx_icr;
1373 /* the transmitter may be disabled */
1374 scxctr = *port->_control;
1375 if (!(scxctr & SC01CTR_TXE)) {
1376 /* restart the UART clock */
1377 tmxmd = *port->_tmxmd;
1379 switch (port->div_timer) {
1380 case MNSCx_DIV_TIMER_16BIT:
1382 *port->_tmxmd = TM8MD_INIT_COUNTER;
1383 *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE;
1386 case MNSCx_DIV_TIMER_8BIT:
1388 *port->_tmxmd = TM2MD_INIT_COUNTER;
1389 *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE;
1393 /* enable the transmitter */
1394 *port->_control = (scxctr & ~SC01CTR_BKE) | SC01CTR_TXE;
1396 } else if (scxctr & SC01CTR_BKE) {
1397 /* stop transmitting BREAK */
1398 *port->_control = (scxctr & ~SC01CTR_BKE);
1401 /* send the chars into the serial port (with LF -> LFCR conversion) */
1402 for (i = 0; i < count; i++) {
1405 while (*port->_status & SC01STR_TBF)
1407 *(u8 *) port->_txb = ch;
1410 while (*port->_status & SC01STR_TBF)
1412 *(u8 *) port->_txb = 0xd;
1416 /* can't let the transmitter be turned off if it's actually
1418 while (*port->_status & (SC01STR_TXF | SC01STR_TBF))
1421 /* disable the transmitter if we re-enabled it */
1422 if (!(scxctr & SC01CTR_TXE))
1423 *port->_control = scxctr;
1425 *port->tx_icr = txicr;
1426 tmp = *port->tx_icr;
1430 * set up a serial port as a console
1431 * - construct a cflag setting for the first rs_open()
1432 * - initialize the serial port
1433 * - return non-zero if we didn't find a serial port.
1435 static int __init mn10300_serial_console_setup(struct console *co,
1438 struct mn10300_serial_port *port;
1439 int i, parity = 'n', baud = 9600, bits = 8, flow = 0;
1441 for (i = 0 ; i < NR_PORTS ; i++) {
1442 port = mn10300_serial_ports[i];
1443 if (port && !port->gdbstub && port->uart.line == co->index)
1450 switch (port->clock_src) {
1451 case MNSCx_CLOCK_SRC_IOCLK:
1452 port->ioclk = MN10300_IOCLK;
1455 #ifdef MN10300_IOBCLK
1456 case MNSCx_CLOCK_SRC_IOBCLK:
1457 port->ioclk = MN10300_IOBCLK;
1465 uart_parse_options(options, &baud, &parity, &bits, &flow);
1467 return uart_set_options(&port->uart, co, baud, parity, bits, flow);
1473 static int __init mn10300_serial_console_init(void)
1475 register_console(&mn10300_serial_console);
1479 console_initcall(mn10300_serial_console_init);