1 /****************************************************************************/
4 * mcf.c -- Freescale ColdFire UART driver
6 * (C) Copyright 2003-2007, Greg Ungerer <gerg@uclinux.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 /****************************************************************************/
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/console.h>
21 #include <linux/tty.h>
22 #include <linux/tty_flip.h>
23 #include <linux/serial.h>
24 #include <linux/serial_core.h>
26 #include <linux/uaccess.h>
27 #include <linux/platform_device.h>
28 #include <asm/coldfire.h>
29 #include <asm/mcfsim.h>
30 #include <asm/mcfuart.h>
31 #include <asm/nettel.h>
33 /****************************************************************************/
36 * Some boards implement the DTR/DCD lines using GPIO lines, most
37 * don't. Dummy out the access macros for those that don't. Those
38 * that do should define these macros somewhere in there board
39 * specific inlude files.
41 #if !defined(mcf_getppdcd)
42 #define mcf_getppdcd(p) (1)
44 #if !defined(mcf_getppdtr)
45 #define mcf_getppdtr(p) (1)
47 #if !defined(mcf_setppdtr)
48 #define mcf_setppdtr(p, v) do { } while (0)
51 /****************************************************************************/
54 * Local per-uart structure.
57 struct uart_port port
;
58 unsigned int sigs
; /* Local copy of line sigs */
59 unsigned char imr
; /* Local IMR mirror */
62 /****************************************************************************/
64 static unsigned int mcf_tx_empty(struct uart_port
*port
)
66 return (readb(port
->membase
+ MCFUART_USR
) & MCFUART_USR_TXEMPTY
) ?
70 /****************************************************************************/
72 static unsigned int mcf_get_mctrl(struct uart_port
*port
)
74 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
77 sigs
= (readb(port
->membase
+ MCFUART_UIPR
) & MCFUART_UIPR_CTS
) ?
79 sigs
|= (pp
->sigs
& TIOCM_RTS
);
80 sigs
|= (mcf_getppdcd(port
->line
) ? TIOCM_CD
: 0);
81 sigs
|= (mcf_getppdtr(port
->line
) ? TIOCM_DTR
: 0);
86 /****************************************************************************/
88 static void mcf_set_mctrl(struct uart_port
*port
, unsigned int sigs
)
90 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
93 mcf_setppdtr(port
->line
, (sigs
& TIOCM_DTR
));
95 writeb(MCFUART_UOP_RTS
, port
->membase
+ MCFUART_UOP1
);
97 writeb(MCFUART_UOP_RTS
, port
->membase
+ MCFUART_UOP0
);
100 /****************************************************************************/
102 static void mcf_start_tx(struct uart_port
*port
)
104 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
106 if (port
->rs485
.flags
& SER_RS485_ENABLED
) {
107 /* Enable Transmitter */
108 writeb(MCFUART_UCR_TXENABLE
, port
->membase
+ MCFUART_UCR
);
109 /* Manually assert RTS */
110 writeb(MCFUART_UOP_RTS
, port
->membase
+ MCFUART_UOP1
);
112 pp
->imr
|= MCFUART_UIR_TXREADY
;
113 writeb(pp
->imr
, port
->membase
+ MCFUART_UIMR
);
116 /****************************************************************************/
118 static void mcf_stop_tx(struct uart_port
*port
)
120 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
122 pp
->imr
&= ~MCFUART_UIR_TXREADY
;
123 writeb(pp
->imr
, port
->membase
+ MCFUART_UIMR
);
126 /****************************************************************************/
128 static void mcf_stop_rx(struct uart_port
*port
)
130 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
132 pp
->imr
&= ~MCFUART_UIR_RXREADY
;
133 writeb(pp
->imr
, port
->membase
+ MCFUART_UIMR
);
136 /****************************************************************************/
138 static void mcf_break_ctl(struct uart_port
*port
, int break_state
)
142 spin_lock_irqsave(&port
->lock
, flags
);
143 if (break_state
== -1)
144 writeb(MCFUART_UCR_CMDBREAKSTART
, port
->membase
+ MCFUART_UCR
);
146 writeb(MCFUART_UCR_CMDBREAKSTOP
, port
->membase
+ MCFUART_UCR
);
147 spin_unlock_irqrestore(&port
->lock
, flags
);
150 /****************************************************************************/
152 static int mcf_startup(struct uart_port
*port
)
154 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
157 spin_lock_irqsave(&port
->lock
, flags
);
159 /* Reset UART, get it into known state... */
160 writeb(MCFUART_UCR_CMDRESETRX
, port
->membase
+ MCFUART_UCR
);
161 writeb(MCFUART_UCR_CMDRESETTX
, port
->membase
+ MCFUART_UCR
);
163 /* Enable the UART transmitter and receiver */
164 writeb(MCFUART_UCR_RXENABLE
| MCFUART_UCR_TXENABLE
,
165 port
->membase
+ MCFUART_UCR
);
167 /* Enable RX interrupts now */
168 pp
->imr
= MCFUART_UIR_RXREADY
;
169 writeb(pp
->imr
, port
->membase
+ MCFUART_UIMR
);
171 spin_unlock_irqrestore(&port
->lock
, flags
);
176 /****************************************************************************/
178 static void mcf_shutdown(struct uart_port
*port
)
180 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
183 spin_lock_irqsave(&port
->lock
, flags
);
185 /* Disable all interrupts now */
187 writeb(pp
->imr
, port
->membase
+ MCFUART_UIMR
);
189 /* Disable UART transmitter and receiver */
190 writeb(MCFUART_UCR_CMDRESETRX
, port
->membase
+ MCFUART_UCR
);
191 writeb(MCFUART_UCR_CMDRESETTX
, port
->membase
+ MCFUART_UCR
);
193 spin_unlock_irqrestore(&port
->lock
, flags
);
196 /****************************************************************************/
198 static void mcf_set_termios(struct uart_port
*port
, struct ktermios
*termios
,
199 struct ktermios
*old
)
202 unsigned int baud
, baudclk
;
203 #if defined(CONFIG_M5272)
206 unsigned char mr1
, mr2
;
208 baud
= uart_get_baud_rate(port
, termios
, old
, 0, 230400);
209 #if defined(CONFIG_M5272)
210 baudclk
= (MCF_BUSCLK
/ baud
) / 32;
211 baudfr
= (((MCF_BUSCLK
/ baud
) + 1) / 2) % 16;
213 baudclk
= ((MCF_BUSCLK
/ baud
) + 16) / 32;
216 mr1
= MCFUART_MR1_RXIRQRDY
| MCFUART_MR1_RXERRCHAR
;
219 switch (termios
->c_cflag
& CSIZE
) {
220 case CS5
: mr1
|= MCFUART_MR1_CS5
; break;
221 case CS6
: mr1
|= MCFUART_MR1_CS6
; break;
222 case CS7
: mr1
|= MCFUART_MR1_CS7
; break;
224 default: mr1
|= MCFUART_MR1_CS8
; break;
227 if (termios
->c_cflag
& PARENB
) {
228 if (termios
->c_cflag
& CMSPAR
) {
229 if (termios
->c_cflag
& PARODD
)
230 mr1
|= MCFUART_MR1_PARITYMARK
;
232 mr1
|= MCFUART_MR1_PARITYSPACE
;
234 if (termios
->c_cflag
& PARODD
)
235 mr1
|= MCFUART_MR1_PARITYODD
;
237 mr1
|= MCFUART_MR1_PARITYEVEN
;
240 mr1
|= MCFUART_MR1_PARITYNONE
;
244 * FIXME: port->read_status_mask and port->ignore_status_mask
245 * need to be initialized based on termios settings for
246 * INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
249 if (termios
->c_cflag
& CSTOPB
)
250 mr2
|= MCFUART_MR2_STOP2
;
252 mr2
|= MCFUART_MR2_STOP1
;
254 if (termios
->c_cflag
& CRTSCTS
) {
255 mr1
|= MCFUART_MR1_RXRTS
;
256 mr2
|= MCFUART_MR2_TXCTS
;
259 spin_lock_irqsave(&port
->lock
, flags
);
260 if (port
->rs485
.flags
& SER_RS485_ENABLED
) {
261 dev_dbg(port
->dev
, "Setting UART to RS485\n");
262 mr2
|= MCFUART_MR2_TXRTS
;
265 uart_update_timeout(port
, termios
->c_cflag
, baud
);
266 writeb(MCFUART_UCR_CMDRESETRX
, port
->membase
+ MCFUART_UCR
);
267 writeb(MCFUART_UCR_CMDRESETTX
, port
->membase
+ MCFUART_UCR
);
268 writeb(MCFUART_UCR_CMDRESETMRPTR
, port
->membase
+ MCFUART_UCR
);
269 writeb(mr1
, port
->membase
+ MCFUART_UMR
);
270 writeb(mr2
, port
->membase
+ MCFUART_UMR
);
271 writeb((baudclk
& 0xff00) >> 8, port
->membase
+ MCFUART_UBG1
);
272 writeb((baudclk
& 0xff), port
->membase
+ MCFUART_UBG2
);
273 #if defined(CONFIG_M5272)
274 writeb((baudfr
& 0x0f), port
->membase
+ MCFUART_UFPD
);
276 writeb(MCFUART_UCSR_RXCLKTIMER
| MCFUART_UCSR_TXCLKTIMER
,
277 port
->membase
+ MCFUART_UCSR
);
278 writeb(MCFUART_UCR_RXENABLE
| MCFUART_UCR_TXENABLE
,
279 port
->membase
+ MCFUART_UCR
);
280 spin_unlock_irqrestore(&port
->lock
, flags
);
283 /****************************************************************************/
285 static void mcf_rx_chars(struct mcf_uart
*pp
)
287 struct uart_port
*port
= &pp
->port
;
288 unsigned char status
, ch
, flag
;
290 while ((status
= readb(port
->membase
+ MCFUART_USR
)) & MCFUART_USR_RXREADY
) {
291 ch
= readb(port
->membase
+ MCFUART_URB
);
295 if (status
& MCFUART_USR_RXERR
) {
296 writeb(MCFUART_UCR_CMDRESETERR
,
297 port
->membase
+ MCFUART_UCR
);
299 if (status
& MCFUART_USR_RXBREAK
) {
301 if (uart_handle_break(port
))
303 } else if (status
& MCFUART_USR_RXPARITY
) {
304 port
->icount
.parity
++;
305 } else if (status
& MCFUART_USR_RXOVERRUN
) {
306 port
->icount
.overrun
++;
307 } else if (status
& MCFUART_USR_RXFRAMING
) {
308 port
->icount
.frame
++;
311 status
&= port
->read_status_mask
;
313 if (status
& MCFUART_USR_RXBREAK
)
315 else if (status
& MCFUART_USR_RXPARITY
)
317 else if (status
& MCFUART_USR_RXFRAMING
)
321 if (uart_handle_sysrq_char(port
, ch
))
323 uart_insert_char(port
, status
, MCFUART_USR_RXOVERRUN
, ch
, flag
);
326 spin_unlock(&port
->lock
);
327 tty_flip_buffer_push(&port
->state
->port
);
328 spin_lock(&port
->lock
);
331 /****************************************************************************/
333 static void mcf_tx_chars(struct mcf_uart
*pp
)
335 struct uart_port
*port
= &pp
->port
;
336 struct circ_buf
*xmit
= &port
->state
->xmit
;
339 /* Send special char - probably flow control */
340 writeb(port
->x_char
, port
->membase
+ MCFUART_UTB
);
346 while (readb(port
->membase
+ MCFUART_USR
) & MCFUART_USR_TXREADY
) {
347 if (xmit
->head
== xmit
->tail
)
349 writeb(xmit
->buf
[xmit
->tail
], port
->membase
+ MCFUART_UTB
);
350 xmit
->tail
= (xmit
->tail
+ 1) & (UART_XMIT_SIZE
-1);
354 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
355 uart_write_wakeup(port
);
357 if (xmit
->head
== xmit
->tail
) {
358 pp
->imr
&= ~MCFUART_UIR_TXREADY
;
359 writeb(pp
->imr
, port
->membase
+ MCFUART_UIMR
);
360 /* Disable TX to negate RTS automatically */
361 if (port
->rs485
.flags
& SER_RS485_ENABLED
)
362 writeb(MCFUART_UCR_TXDISABLE
,
363 port
->membase
+ MCFUART_UCR
);
367 /****************************************************************************/
369 static irqreturn_t
mcf_interrupt(int irq
, void *data
)
371 struct uart_port
*port
= data
;
372 struct mcf_uart
*pp
= container_of(port
, struct mcf_uart
, port
);
374 irqreturn_t ret
= IRQ_NONE
;
376 isr
= readb(port
->membase
+ MCFUART_UISR
) & pp
->imr
;
378 spin_lock(&port
->lock
);
379 if (isr
& MCFUART_UIR_RXREADY
) {
383 if (isr
& MCFUART_UIR_TXREADY
) {
387 spin_unlock(&port
->lock
);
392 /****************************************************************************/
394 static void mcf_config_port(struct uart_port
*port
, int flags
)
396 port
->type
= PORT_MCF
;
397 port
->fifosize
= MCFUART_TXFIFOSIZE
;
399 /* Clear mask, so no surprise interrupts. */
400 writeb(0, port
->membase
+ MCFUART_UIMR
);
402 if (request_irq(port
->irq
, mcf_interrupt
, 0, "UART", port
))
403 printk(KERN_ERR
"MCF: unable to attach ColdFire UART %d "
404 "interrupt vector=%d\n", port
->line
, port
->irq
);
407 /****************************************************************************/
409 static const char *mcf_type(struct uart_port
*port
)
411 return (port
->type
== PORT_MCF
) ? "ColdFire UART" : NULL
;
414 /****************************************************************************/
416 static int mcf_request_port(struct uart_port
*port
)
418 /* UARTs always present */
422 /****************************************************************************/
424 static void mcf_release_port(struct uart_port
*port
)
426 /* Nothing to release... */
429 /****************************************************************************/
431 static int mcf_verify_port(struct uart_port
*port
, struct serial_struct
*ser
)
433 if ((ser
->type
!= PORT_UNKNOWN
) && (ser
->type
!= PORT_MCF
))
438 /****************************************************************************/
440 /* Enable or disable the RS485 support */
441 static int mcf_config_rs485(struct uart_port
*port
, struct serial_rs485
*rs485
)
443 unsigned char mr1
, mr2
;
445 /* Get mode registers */
446 mr1
= readb(port
->membase
+ MCFUART_UMR
);
447 mr2
= readb(port
->membase
+ MCFUART_UMR
);
448 if (rs485
->flags
& SER_RS485_ENABLED
) {
449 dev_dbg(port
->dev
, "Setting UART to RS485\n");
450 /* Automatically negate RTS after TX completes */
451 mr2
|= MCFUART_MR2_TXRTS
;
453 dev_dbg(port
->dev
, "Setting UART to RS232\n");
454 mr2
&= ~MCFUART_MR2_TXRTS
;
456 writeb(mr1
, port
->membase
+ MCFUART_UMR
);
457 writeb(mr2
, port
->membase
+ MCFUART_UMR
);
458 port
->rs485
= *rs485
;
463 /****************************************************************************/
466 * Define the basic serial functions we support.
468 static const struct uart_ops mcf_uart_ops
= {
469 .tx_empty
= mcf_tx_empty
,
470 .get_mctrl
= mcf_get_mctrl
,
471 .set_mctrl
= mcf_set_mctrl
,
472 .start_tx
= mcf_start_tx
,
473 .stop_tx
= mcf_stop_tx
,
474 .stop_rx
= mcf_stop_rx
,
475 .break_ctl
= mcf_break_ctl
,
476 .startup
= mcf_startup
,
477 .shutdown
= mcf_shutdown
,
478 .set_termios
= mcf_set_termios
,
480 .request_port
= mcf_request_port
,
481 .release_port
= mcf_release_port
,
482 .config_port
= mcf_config_port
,
483 .verify_port
= mcf_verify_port
,
486 static struct mcf_uart mcf_ports
[4];
488 #define MCF_MAXPORTS ARRAY_SIZE(mcf_ports)
490 /****************************************************************************/
491 #if defined(CONFIG_SERIAL_MCF_CONSOLE)
492 /****************************************************************************/
494 int __init
early_mcf_setup(struct mcf_platform_uart
*platp
)
496 struct uart_port
*port
;
499 for (i
= 0; ((i
< MCF_MAXPORTS
) && (platp
[i
].mapbase
)); i
++) {
500 port
= &mcf_ports
[i
].port
;
503 port
->type
= PORT_MCF
;
504 port
->mapbase
= platp
[i
].mapbase
;
505 port
->membase
= (platp
[i
].membase
) ? platp
[i
].membase
:
506 (unsigned char __iomem
*) port
->mapbase
;
507 port
->iotype
= SERIAL_IO_MEM
;
508 port
->irq
= platp
[i
].irq
;
509 port
->uartclk
= MCF_BUSCLK
;
510 port
->flags
= UPF_BOOT_AUTOCONF
;
511 port
->rs485_config
= mcf_config_rs485
;
512 port
->ops
= &mcf_uart_ops
;
518 /****************************************************************************/
520 static void mcf_console_putc(struct console
*co
, const char c
)
522 struct uart_port
*port
= &(mcf_ports
+ co
->index
)->port
;
525 for (i
= 0; (i
< 0x10000); i
++) {
526 if (readb(port
->membase
+ MCFUART_USR
) & MCFUART_USR_TXREADY
)
529 writeb(c
, port
->membase
+ MCFUART_UTB
);
530 for (i
= 0; (i
< 0x10000); i
++) {
531 if (readb(port
->membase
+ MCFUART_USR
) & MCFUART_USR_TXREADY
)
536 /****************************************************************************/
538 static void mcf_console_write(struct console
*co
, const char *s
, unsigned int count
)
540 for (; (count
); count
--, s
++) {
541 mcf_console_putc(co
, *s
);
543 mcf_console_putc(co
, '\r');
547 /****************************************************************************/
549 static int __init
mcf_console_setup(struct console
*co
, char *options
)
551 struct uart_port
*port
;
552 int baud
= CONFIG_SERIAL_MCF_BAUDRATE
;
557 if ((co
->index
< 0) || (co
->index
>= MCF_MAXPORTS
))
559 port
= &mcf_ports
[co
->index
].port
;
560 if (port
->membase
== 0)
564 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
566 return uart_set_options(port
, co
, baud
, parity
, bits
, flow
);
569 /****************************************************************************/
571 static struct uart_driver mcf_driver
;
573 static struct console mcf_console
= {
575 .write
= mcf_console_write
,
576 .device
= uart_console_device
,
577 .setup
= mcf_console_setup
,
578 .flags
= CON_PRINTBUFFER
,
583 static int __init
mcf_console_init(void)
585 register_console(&mcf_console
);
589 console_initcall(mcf_console_init
);
591 #define MCF_CONSOLE &mcf_console
593 /****************************************************************************/
595 /****************************************************************************/
597 #define MCF_CONSOLE NULL
599 /****************************************************************************/
600 #endif /* CONFIG_MCF_CONSOLE */
601 /****************************************************************************/
604 * Define the mcf UART driver structure.
606 static struct uart_driver mcf_driver
= {
607 .owner
= THIS_MODULE
,
608 .driver_name
= "mcf",
616 /****************************************************************************/
618 static int mcf_probe(struct platform_device
*pdev
)
620 struct mcf_platform_uart
*platp
= dev_get_platdata(&pdev
->dev
);
621 struct uart_port
*port
;
624 for (i
= 0; ((i
< MCF_MAXPORTS
) && (platp
[i
].mapbase
)); i
++) {
625 port
= &mcf_ports
[i
].port
;
628 port
->type
= PORT_MCF
;
629 port
->mapbase
= platp
[i
].mapbase
;
630 port
->membase
= (platp
[i
].membase
) ? platp
[i
].membase
:
631 (unsigned char __iomem
*) platp
[i
].mapbase
;
632 port
->dev
= &pdev
->dev
;
633 port
->iotype
= SERIAL_IO_MEM
;
634 port
->irq
= platp
[i
].irq
;
635 port
->uartclk
= MCF_BUSCLK
;
636 port
->ops
= &mcf_uart_ops
;
637 port
->flags
= UPF_BOOT_AUTOCONF
;
638 port
->rs485_config
= mcf_config_rs485
;
640 uart_add_one_port(&mcf_driver
, port
);
646 /****************************************************************************/
648 static int mcf_remove(struct platform_device
*pdev
)
650 struct uart_port
*port
;
653 for (i
= 0; (i
< MCF_MAXPORTS
); i
++) {
654 port
= &mcf_ports
[i
].port
;
656 uart_remove_one_port(&mcf_driver
, port
);
662 /****************************************************************************/
664 static struct platform_driver mcf_platform_driver
= {
666 .remove
= mcf_remove
,
672 /****************************************************************************/
674 static int __init
mcf_init(void)
678 printk("ColdFire internal UART serial driver\n");
680 rc
= uart_register_driver(&mcf_driver
);
683 rc
= platform_driver_register(&mcf_platform_driver
);
685 uart_unregister_driver(&mcf_driver
);
691 /****************************************************************************/
693 static void __exit
mcf_exit(void)
695 platform_driver_unregister(&mcf_platform_driver
);
696 uart_unregister_driver(&mcf_driver
);
699 /****************************************************************************/
701 module_init(mcf_init
);
702 module_exit(mcf_exit
);
704 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
705 MODULE_DESCRIPTION("Freescale ColdFire UART driver");
706 MODULE_LICENSE("GPL");
707 MODULE_ALIAS("platform:mcfuart");
709 /****************************************************************************/