2 * drivers/serial/sh-sci.c
4 * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
6 * Copyright (C) 2002 - 2008 Paul Mundt
7 * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007).
9 * based off of the old drivers/char/sh-sci.c by:
11 * Copyright (C) 1999, 2000 Niibe Yutaka
12 * Copyright (C) 2000 Sugioka Toshinobu
13 * Modified to support multiple serial ports. Stuart Menefy (May 2000).
14 * Modified to support SecureEdge. David McCullough (2002)
15 * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
16 * Removed SH7300 support (Jul 2007).
18 * This file is subject to the terms and conditions of the GNU General Public
19 * License. See the file "COPYING" in the main directory of this archive
22 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/timer.h>
31 #include <linux/interrupt.h>
32 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/serial.h>
35 #include <linux/major.h>
36 #include <linux/string.h>
37 #include <linux/sysrq.h>
38 #include <linux/ioport.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
42 #include <linux/console.h>
43 #include <linux/platform_device.h>
44 #include <linux/serial_sci.h>
45 #include <linux/notifier.h>
46 #include <linux/cpufreq.h>
47 #include <linux/clk.h>
48 #include <linux/ctype.h>
49 #include <linux/err.h>
50 #include <linux/list.h>
51 #include <linux/dmaengine.h>
52 #include <linux/scatterlist.h>
55 #include <asm/sh_bios.h>
65 struct uart_port port
;
70 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
71 unsigned int irqs
[SCIx_NR_IRQS
];
73 /* Port enable callback */
74 void (*enable
)(struct uart_port
*port
);
76 /* Port disable callback */
77 void (*disable
)(struct uart_port
*port
);
80 struct timer_list break_timer
;
88 struct list_head node
;
89 struct dma_chan
*chan_tx
;
90 struct dma_chan
*chan_rx
;
91 #ifdef CONFIG_SERIAL_SH_SCI_DMA
92 struct device
*dma_dev
;
93 enum sh_dmae_slave_chan_id slave_tx
;
94 enum sh_dmae_slave_chan_id slave_rx
;
95 struct dma_async_tx_descriptor
*desc_tx
;
96 struct dma_async_tx_descriptor
*desc_rx
[2];
97 dma_cookie_t cookie_tx
;
98 dma_cookie_t cookie_rx
[2];
99 dma_cookie_t active_rx
;
100 struct scatterlist sg_tx
;
101 unsigned int sg_len_tx
;
102 struct scatterlist sg_rx
[2];
104 struct sh_dmae_slave param_tx
;
105 struct sh_dmae_slave param_rx
;
106 struct work_struct work_tx
;
107 struct work_struct work_rx
;
108 struct timer_list rx_timer
;
114 struct list_head ports
;
115 struct notifier_block clk_nb
;
118 /* Function prototypes */
119 static void sci_stop_tx(struct uart_port
*port
);
121 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
123 static struct sci_port sci_ports
[SCI_NPORTS
];
124 static struct uart_driver sci_uart_driver
;
126 static inline struct sci_port
*
127 to_sci_port(struct uart_port
*uart
)
129 return container_of(uart
, struct sci_port
, port
);
132 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
134 #ifdef CONFIG_CONSOLE_POLL
135 static inline void handle_error(struct uart_port
*port
)
137 /* Clear error flags */
138 sci_out(port
, SCxSR
, SCxSR_ERROR_CLEAR(port
));
141 static int sci_poll_get_char(struct uart_port
*port
)
143 unsigned short status
;
147 status
= sci_in(port
, SCxSR
);
148 if (status
& SCxSR_ERRORS(port
)) {
152 } while (!(status
& SCxSR_RDxF(port
)));
154 c
= sci_in(port
, SCxRDR
);
158 sci_out(port
, SCxSR
, SCxSR_RDxF_CLEAR(port
));
164 static void sci_poll_put_char(struct uart_port
*port
, unsigned char c
)
166 unsigned short status
;
169 status
= sci_in(port
, SCxSR
);
170 } while (!(status
& SCxSR_TDxE(port
)));
172 sci_out(port
, SCxTDR
, c
);
173 sci_out(port
, SCxSR
, SCxSR_TDxE_CLEAR(port
) & ~SCxSR_TEND(port
));
175 #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
177 #if defined(__H8300H__) || defined(__H8300S__)
178 static void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
180 int ch
= (port
->mapbase
- SMR0
) >> 3;
183 H8300_GPIO_DDR(h8300_sci_pins
[ch
].port
,
184 h8300_sci_pins
[ch
].rx
,
186 H8300_GPIO_DDR(h8300_sci_pins
[ch
].port
,
187 h8300_sci_pins
[ch
].tx
,
191 H8300_SCI_DR(ch
) |= h8300_sci_pins
[ch
].tx
;
193 #elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
194 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
196 if (port
->mapbase
== 0xA4400000) {
197 __raw_writew(__raw_readw(PACR
) & 0xffc0, PACR
);
198 __raw_writew(__raw_readw(PBCR
) & 0x0fff, PBCR
);
199 } else if (port
->mapbase
== 0xA4410000)
200 __raw_writew(__raw_readw(PBCR
) & 0xf003, PBCR
);
202 #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
203 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
207 if (cflag
& CRTSCTS
) {
209 if (port
->mapbase
== 0xa4430000) { /* SCIF0 */
210 /* Clear PTCR bit 9-2; enable all scif pins but sck */
211 data
= __raw_readw(PORT_PTCR
);
212 __raw_writew((data
& 0xfc03), PORT_PTCR
);
213 } else if (port
->mapbase
== 0xa4438000) { /* SCIF1 */
214 /* Clear PVCR bit 9-2 */
215 data
= __raw_readw(PORT_PVCR
);
216 __raw_writew((data
& 0xfc03), PORT_PVCR
);
219 if (port
->mapbase
== 0xa4430000) { /* SCIF0 */
220 /* Clear PTCR bit 5-2; enable only tx and rx */
221 data
= __raw_readw(PORT_PTCR
);
222 __raw_writew((data
& 0xffc3), PORT_PTCR
);
223 } else if (port
->mapbase
== 0xa4438000) { /* SCIF1 */
224 /* Clear PVCR bit 5-2 */
225 data
= __raw_readw(PORT_PVCR
);
226 __raw_writew((data
& 0xffc3), PORT_PVCR
);
230 #elif defined(CONFIG_CPU_SH3)
231 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
232 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
236 /* We need to set SCPCR to enable RTS/CTS */
237 data
= __raw_readw(SCPCR
);
238 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
239 __raw_writew(data
& 0x0fcf, SCPCR
);
241 if (!(cflag
& CRTSCTS
)) {
242 /* We need to set SCPCR to enable RTS/CTS */
243 data
= __raw_readw(SCPCR
);
244 /* Clear out SCP7MD1,0, SCP4MD1,0,
245 Set SCP6MD1,0 = {01} (output) */
246 __raw_writew((data
& 0x0fcf) | 0x1000, SCPCR
);
248 data
= __raw_readb(SCPDR
);
249 /* Set /RTS2 (bit6) = 0 */
250 __raw_writeb(data
& 0xbf, SCPDR
);
253 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
254 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
258 if (port
->mapbase
== 0xffe00000) {
259 data
= __raw_readw(PSCR
);
261 if (!(cflag
& CRTSCTS
))
264 __raw_writew(data
, PSCR
);
267 #elif defined(CONFIG_CPU_SUBTYPE_SH7757) || \
268 defined(CONFIG_CPU_SUBTYPE_SH7763) || \
269 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
270 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
271 defined(CONFIG_CPU_SUBTYPE_SH7786) || \
272 defined(CONFIG_CPU_SUBTYPE_SHX3)
273 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
275 if (!(cflag
& CRTSCTS
))
276 __raw_writew(0x0080, SCSPTR0
); /* Set RTS = 1 */
278 #elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A)
279 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
281 if (!(cflag
& CRTSCTS
))
282 __raw_writew(0x0080, SCSPTR2
); /* Set RTS = 1 */
285 static inline void sci_init_pins(struct uart_port
*port
, unsigned int cflag
)
291 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
292 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
293 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
294 defined(CONFIG_CPU_SUBTYPE_SH7786)
295 static int scif_txfill(struct uart_port
*port
)
297 return sci_in(port
, SCTFDR
) & 0xff;
300 static int scif_txroom(struct uart_port
*port
)
302 return SCIF_TXROOM_MAX
- scif_txfill(port
);
305 static int scif_rxfill(struct uart_port
*port
)
307 return sci_in(port
, SCRFDR
) & 0xff;
309 #elif defined(CONFIG_CPU_SUBTYPE_SH7763)
310 static int scif_txfill(struct uart_port
*port
)
312 if (port
->mapbase
== 0xffe00000 ||
313 port
->mapbase
== 0xffe08000)
315 return sci_in(port
, SCTFDR
) & 0xff;
318 return sci_in(port
, SCFDR
) >> 8;
321 static int scif_txroom(struct uart_port
*port
)
323 if (port
->mapbase
== 0xffe00000 ||
324 port
->mapbase
== 0xffe08000)
326 return SCIF_TXROOM_MAX
- scif_txfill(port
);
329 return SCIF2_TXROOM_MAX
- scif_txfill(port
);
332 static int scif_rxfill(struct uart_port
*port
)
334 if ((port
->mapbase
== 0xffe00000) ||
335 (port
->mapbase
== 0xffe08000)) {
337 return sci_in(port
, SCRFDR
) & 0xff;
340 return sci_in(port
, SCFDR
) & SCIF2_RFDC_MASK
;
344 static int scif_txfill(struct uart_port
*port
)
346 return sci_in(port
, SCFDR
) >> 8;
349 static int scif_txroom(struct uart_port
*port
)
351 return SCIF_TXROOM_MAX
- scif_txfill(port
);
354 static int scif_rxfill(struct uart_port
*port
)
356 return sci_in(port
, SCFDR
) & SCIF_RFDC_MASK
;
360 static int sci_txfill(struct uart_port
*port
)
362 return !(sci_in(port
, SCxSR
) & SCI_TDRE
);
365 static int sci_txroom(struct uart_port
*port
)
367 return !sci_txfill(port
);
370 static int sci_rxfill(struct uart_port
*port
)
372 return (sci_in(port
, SCxSR
) & SCxSR_RDxF(port
)) != 0;
375 /* ********************************************************************** *
376 * the interrupt related routines *
377 * ********************************************************************** */
379 static void sci_transmit_chars(struct uart_port
*port
)
381 struct circ_buf
*xmit
= &port
->state
->xmit
;
382 unsigned int stopped
= uart_tx_stopped(port
);
383 unsigned short status
;
387 status
= sci_in(port
, SCxSR
);
388 if (!(status
& SCxSR_TDxE(port
))) {
389 ctrl
= sci_in(port
, SCSCR
);
390 if (uart_circ_empty(xmit
))
391 ctrl
&= ~SCI_CTRL_FLAGS_TIE
;
393 ctrl
|= SCI_CTRL_FLAGS_TIE
;
394 sci_out(port
, SCSCR
, ctrl
);
398 if (port
->type
== PORT_SCI
)
399 count
= sci_txroom(port
);
401 count
= scif_txroom(port
);
409 } else if (!uart_circ_empty(xmit
) && !stopped
) {
410 c
= xmit
->buf
[xmit
->tail
];
411 xmit
->tail
= (xmit
->tail
+ 1) & (UART_XMIT_SIZE
- 1);
416 sci_out(port
, SCxTDR
, c
);
419 } while (--count
> 0);
421 sci_out(port
, SCxSR
, SCxSR_TDxE_CLEAR(port
));
423 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
424 uart_write_wakeup(port
);
425 if (uart_circ_empty(xmit
)) {
428 ctrl
= sci_in(port
, SCSCR
);
430 if (port
->type
!= PORT_SCI
) {
431 sci_in(port
, SCxSR
); /* Dummy read */
432 sci_out(port
, SCxSR
, SCxSR_TDxE_CLEAR(port
));
435 ctrl
|= SCI_CTRL_FLAGS_TIE
;
436 sci_out(port
, SCSCR
, ctrl
);
440 /* On SH3, SCIF may read end-of-break as a space->mark char */
441 #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); })
443 static inline void sci_receive_chars(struct uart_port
*port
)
445 struct sci_port
*sci_port
= to_sci_port(port
);
446 struct tty_struct
*tty
= port
->state
->port
.tty
;
447 int i
, count
, copied
= 0;
448 unsigned short status
;
451 status
= sci_in(port
, SCxSR
);
452 if (!(status
& SCxSR_RDxF(port
)))
456 if (port
->type
== PORT_SCI
)
457 count
= sci_rxfill(port
);
459 count
= scif_rxfill(port
);
461 /* Don't copy more bytes than there is room for in the buffer */
462 count
= tty_buffer_request_room(tty
, count
);
464 /* If for any reason we can't copy more data, we're done! */
468 if (port
->type
== PORT_SCI
) {
469 char c
= sci_in(port
, SCxRDR
);
470 if (uart_handle_sysrq_char(port
, c
) ||
471 sci_port
->break_flag
)
474 tty_insert_flip_char(tty
, c
, TTY_NORMAL
);
476 for (i
= 0; i
< count
; i
++) {
477 char c
= sci_in(port
, SCxRDR
);
478 status
= sci_in(port
, SCxSR
);
479 #if defined(CONFIG_CPU_SH3)
480 /* Skip "chars" during break */
481 if (sci_port
->break_flag
) {
483 (status
& SCxSR_FER(port
))) {
488 /* Nonzero => end-of-break */
489 dev_dbg(port
->dev
, "debounce<%02x>\n", c
);
490 sci_port
->break_flag
= 0;
497 #endif /* CONFIG_CPU_SH3 */
498 if (uart_handle_sysrq_char(port
, c
)) {
503 /* Store data and status */
504 if (status
& SCxSR_FER(port
)) {
506 dev_notice(port
->dev
, "frame error\n");
507 } else if (status
& SCxSR_PER(port
)) {
509 dev_notice(port
->dev
, "parity error\n");
513 tty_insert_flip_char(tty
, c
, flag
);
517 sci_in(port
, SCxSR
); /* dummy read */
518 sci_out(port
, SCxSR
, SCxSR_RDxF_CLEAR(port
));
521 port
->icount
.rx
+= count
;
525 /* Tell the rest of the system the news. New characters! */
526 tty_flip_buffer_push(tty
);
528 sci_in(port
, SCxSR
); /* dummy read */
529 sci_out(port
, SCxSR
, SCxSR_RDxF_CLEAR(port
));
533 #define SCI_BREAK_JIFFIES (HZ/20)
534 /* The sci generates interrupts during the break,
535 * 1 per millisecond or so during the break period, for 9600 baud.
536 * So dont bother disabling interrupts.
537 * But dont want more than 1 break event.
538 * Use a kernel timer to periodically poll the rx line until
539 * the break is finished.
541 static void sci_schedule_break_timer(struct sci_port
*port
)
543 port
->break_timer
.expires
= jiffies
+ SCI_BREAK_JIFFIES
;
544 add_timer(&port
->break_timer
);
546 /* Ensure that two consecutive samples find the break over. */
547 static void sci_break_timer(unsigned long data
)
549 struct sci_port
*port
= (struct sci_port
*)data
;
551 if (sci_rxd_in(&port
->port
) == 0) {
552 port
->break_flag
= 1;
553 sci_schedule_break_timer(port
);
554 } else if (port
->break_flag
== 1) {
556 port
->break_flag
= 2;
557 sci_schedule_break_timer(port
);
559 port
->break_flag
= 0;
562 static inline int sci_handle_errors(struct uart_port
*port
)
565 unsigned short status
= sci_in(port
, SCxSR
);
566 struct tty_struct
*tty
= port
->state
->port
.tty
;
568 if (status
& SCxSR_ORER(port
)) {
570 if (tty_insert_flip_char(tty
, 0, TTY_OVERRUN
))
573 dev_notice(port
->dev
, "overrun error");
576 if (status
& SCxSR_FER(port
)) {
577 if (sci_rxd_in(port
) == 0) {
578 /* Notify of BREAK */
579 struct sci_port
*sci_port
= to_sci_port(port
);
581 if (!sci_port
->break_flag
) {
582 sci_port
->break_flag
= 1;
583 sci_schedule_break_timer(sci_port
);
585 /* Do sysrq handling. */
586 if (uart_handle_break(port
))
589 dev_dbg(port
->dev
, "BREAK detected\n");
591 if (tty_insert_flip_char(tty
, 0, TTY_BREAK
))
597 if (tty_insert_flip_char(tty
, 0, TTY_FRAME
))
600 dev_notice(port
->dev
, "frame error\n");
604 if (status
& SCxSR_PER(port
)) {
606 if (tty_insert_flip_char(tty
, 0, TTY_PARITY
))
609 dev_notice(port
->dev
, "parity error");
613 tty_flip_buffer_push(tty
);
618 static inline int sci_handle_fifo_overrun(struct uart_port
*port
)
620 struct tty_struct
*tty
= port
->state
->port
.tty
;
623 if (port
->type
!= PORT_SCIF
)
626 if ((sci_in(port
, SCLSR
) & SCIF_ORER
) != 0) {
627 sci_out(port
, SCLSR
, 0);
629 tty_insert_flip_char(tty
, 0, TTY_OVERRUN
);
630 tty_flip_buffer_push(tty
);
632 dev_notice(port
->dev
, "overrun error\n");
639 static inline int sci_handle_breaks(struct uart_port
*port
)
642 unsigned short status
= sci_in(port
, SCxSR
);
643 struct tty_struct
*tty
= port
->state
->port
.tty
;
644 struct sci_port
*s
= to_sci_port(port
);
646 if (uart_handle_break(port
))
649 if (!s
->break_flag
&& status
& SCxSR_BRK(port
)) {
650 #if defined(CONFIG_CPU_SH3)
654 /* Notify of BREAK */
655 if (tty_insert_flip_char(tty
, 0, TTY_BREAK
))
658 dev_dbg(port
->dev
, "BREAK detected\n");
662 tty_flip_buffer_push(tty
);
664 copied
+= sci_handle_fifo_overrun(port
);
669 static irqreturn_t
sci_rx_interrupt(int irq
, void *ptr
)
671 #ifdef CONFIG_SERIAL_SH_SCI_DMA
672 struct uart_port
*port
= ptr
;
673 struct sci_port
*s
= to_sci_port(port
);
677 u16 scr
= sci_in(port
, SCSCR
);
678 u16 ssr
= sci_in(port
, SCxSR
);
680 /* Disable future Rx interrupts */
681 sci_out(port
, SCSCR
, scr
& ~SCI_CTRL_FLAGS_RIE
);
682 /* Clear current interrupt */
683 sci_out(port
, SCxSR
, ssr
& ~(1 | SCxSR_RDxF(port
)));
684 /* Calculate delay for 1.5 DMA buffers */
685 tout
= (port
->timeout
- HZ
/ 50) * s
->buf_len_rx
* 3 /
687 dev_dbg(port
->dev
, "Rx IRQ: setup timeout in %lu ms\n",
691 mod_timer(&s
->rx_timer
, jiffies
+ tout
);
697 /* I think sci_receive_chars has to be called irrespective
698 * of whether the I_IXOFF is set, otherwise, how is the interrupt
701 sci_receive_chars(ptr
);
706 static irqreturn_t
sci_tx_interrupt(int irq
, void *ptr
)
708 struct uart_port
*port
= ptr
;
711 spin_lock_irqsave(&port
->lock
, flags
);
712 sci_transmit_chars(port
);
713 spin_unlock_irqrestore(&port
->lock
, flags
);
718 static irqreturn_t
sci_er_interrupt(int irq
, void *ptr
)
720 struct uart_port
*port
= ptr
;
723 if (port
->type
== PORT_SCI
) {
724 if (sci_handle_errors(port
)) {
725 /* discard character in rx buffer */
727 sci_out(port
, SCxSR
, SCxSR_RDxF_CLEAR(port
));
730 sci_handle_fifo_overrun(port
);
731 sci_rx_interrupt(irq
, ptr
);
734 sci_out(port
, SCxSR
, SCxSR_ERROR_CLEAR(port
));
736 /* Kick the transmission */
737 sci_tx_interrupt(irq
, ptr
);
742 static irqreturn_t
sci_br_interrupt(int irq
, void *ptr
)
744 struct uart_port
*port
= ptr
;
747 sci_handle_breaks(port
);
748 sci_out(port
, SCxSR
, SCxSR_BREAK_CLEAR(port
));
753 static irqreturn_t
sci_mpxed_interrupt(int irq
, void *ptr
)
755 unsigned short ssr_status
, scr_status
, err_enabled
;
756 struct uart_port
*port
= ptr
;
757 struct sci_port
*s
= to_sci_port(port
);
758 irqreturn_t ret
= IRQ_NONE
;
760 ssr_status
= sci_in(port
, SCxSR
);
761 scr_status
= sci_in(port
, SCSCR
);
762 err_enabled
= scr_status
& (SCI_CTRL_FLAGS_REIE
| SCI_CTRL_FLAGS_RIE
);
765 if ((ssr_status
& SCxSR_TDxE(port
)) && (scr_status
& SCI_CTRL_FLAGS_TIE
) &&
767 ret
= sci_tx_interrupt(irq
, ptr
);
769 * Rx Interrupt: if we're using DMA, the DMA controller clears RDF /
772 if (((ssr_status
& SCxSR_RDxF(port
)) || s
->chan_rx
) &&
773 (scr_status
& SCI_CTRL_FLAGS_RIE
))
774 ret
= sci_rx_interrupt(irq
, ptr
);
775 /* Error Interrupt */
776 if ((ssr_status
& SCxSR_ERRORS(port
)) && err_enabled
)
777 ret
= sci_er_interrupt(irq
, ptr
);
778 /* Break Interrupt */
779 if ((ssr_status
& SCxSR_BRK(port
)) && err_enabled
)
780 ret
= sci_br_interrupt(irq
, ptr
);
782 WARN_ONCE(ret
== IRQ_NONE
,
783 "%s: %d IRQ %d, status %x, control %x\n", __func__
,
784 irq
, port
->line
, ssr_status
, scr_status
);
790 * Here we define a transistion notifier so that we can update all of our
791 * ports' baud rate when the peripheral clock changes.
793 static int sci_notifier(struct notifier_block
*self
,
794 unsigned long phase
, void *p
)
796 struct sh_sci_priv
*priv
= container_of(self
,
797 struct sh_sci_priv
, clk_nb
);
798 struct sci_port
*sci_port
;
801 if ((phase
== CPUFREQ_POSTCHANGE
) ||
802 (phase
== CPUFREQ_RESUMECHANGE
)) {
803 spin_lock_irqsave(&priv
->lock
, flags
);
804 list_for_each_entry(sci_port
, &priv
->ports
, node
)
805 sci_port
->port
.uartclk
= clk_get_rate(sci_port
->dclk
);
806 spin_unlock_irqrestore(&priv
->lock
, flags
);
812 static void sci_clk_enable(struct uart_port
*port
)
814 struct sci_port
*sci_port
= to_sci_port(port
);
816 clk_enable(sci_port
->dclk
);
817 sci_port
->port
.uartclk
= clk_get_rate(sci_port
->dclk
);
820 clk_enable(sci_port
->iclk
);
823 static void sci_clk_disable(struct uart_port
*port
)
825 struct sci_port
*sci_port
= to_sci_port(port
);
828 clk_disable(sci_port
->iclk
);
830 clk_disable(sci_port
->dclk
);
833 static int sci_request_irq(struct sci_port
*port
)
836 irqreturn_t (*handlers
[4])(int irq
, void *ptr
) = {
837 sci_er_interrupt
, sci_rx_interrupt
, sci_tx_interrupt
,
840 const char *desc
[] = { "SCI Receive Error", "SCI Receive Data Full",
841 "SCI Transmit Data Empty", "SCI Break" };
843 if (port
->irqs
[0] == port
->irqs
[1]) {
844 if (unlikely(!port
->irqs
[0]))
847 if (request_irq(port
->irqs
[0], sci_mpxed_interrupt
,
848 IRQF_DISABLED
, "sci", port
)) {
849 dev_err(port
->port
.dev
, "Can't allocate IRQ\n");
853 for (i
= 0; i
< ARRAY_SIZE(handlers
); i
++) {
854 if (unlikely(!port
->irqs
[i
]))
857 if (request_irq(port
->irqs
[i
], handlers
[i
],
858 IRQF_DISABLED
, desc
[i
], port
)) {
859 dev_err(port
->port
.dev
, "Can't allocate IRQ\n");
868 static void sci_free_irq(struct sci_port
*port
)
872 if (port
->irqs
[0] == port
->irqs
[1])
873 free_irq(port
->irqs
[0], port
);
875 for (i
= 0; i
< ARRAY_SIZE(port
->irqs
); i
++) {
879 free_irq(port
->irqs
[i
], port
);
884 static unsigned int sci_tx_empty(struct uart_port
*port
)
886 unsigned short status
= sci_in(port
, SCxSR
);
887 unsigned short in_tx_fifo
= scif_txfill(port
);
889 return (status
& SCxSR_TEND(port
)) && !in_tx_fifo
? TIOCSER_TEMT
: 0;
892 static void sci_set_mctrl(struct uart_port
*port
, unsigned int mctrl
)
894 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
895 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
896 /* If you have signals for DTR and DCD, please implement here. */
899 static unsigned int sci_get_mctrl(struct uart_port
*port
)
901 /* This routine is used for getting signals of: DTR, DCD, DSR, RI,
904 return TIOCM_DTR
| TIOCM_RTS
| TIOCM_DSR
;
907 #ifdef CONFIG_SERIAL_SH_SCI_DMA
908 static void sci_dma_tx_complete(void *arg
)
910 struct sci_port
*s
= arg
;
911 struct uart_port
*port
= &s
->port
;
912 struct circ_buf
*xmit
= &port
->state
->xmit
;
915 dev_dbg(port
->dev
, "%s(%d)\n", __func__
, port
->line
);
917 spin_lock_irqsave(&port
->lock
, flags
);
919 xmit
->tail
+= s
->sg_tx
.length
;
920 xmit
->tail
&= UART_XMIT_SIZE
- 1;
922 port
->icount
.tx
+= s
->sg_tx
.length
;
924 async_tx_ack(s
->desc_tx
);
925 s
->cookie_tx
= -EINVAL
;
928 spin_unlock_irqrestore(&port
->lock
, flags
);
930 if (uart_circ_chars_pending(xmit
) < WAKEUP_CHARS
)
931 uart_write_wakeup(port
);
933 if (uart_circ_chars_pending(xmit
))
934 schedule_work(&s
->work_tx
);
937 /* Locking: called with port lock held */
938 static int sci_dma_rx_push(struct sci_port
*s
, struct tty_struct
*tty
,
941 struct uart_port
*port
= &s
->port
;
944 room
= tty_buffer_request_room(tty
, count
);
946 if (s
->active_rx
== s
->cookie_rx
[0]) {
948 } else if (s
->active_rx
== s
->cookie_rx
[1]) {
951 dev_err(port
->dev
, "cookie %d not found!\n", s
->active_rx
);
956 dev_warn(port
->dev
, "Rx overrun: dropping %u bytes\n",
961 for (i
= 0; i
< room
; i
++)
962 tty_insert_flip_char(tty
, ((u8
*)sg_virt(&s
->sg_rx
[active
]))[i
],
965 port
->icount
.rx
+= room
;
970 static void sci_dma_rx_complete(void *arg
)
972 struct sci_port
*s
= arg
;
973 struct uart_port
*port
= &s
->port
;
974 struct tty_struct
*tty
= port
->state
->port
.tty
;
978 dev_dbg(port
->dev
, "%s(%d)\n", __func__
, port
->line
);
980 spin_lock_irqsave(&port
->lock
, flags
);
982 count
= sci_dma_rx_push(s
, tty
, s
->buf_len_rx
);
984 mod_timer(&s
->rx_timer
, jiffies
+ msecs_to_jiffies(5));
986 spin_unlock_irqrestore(&port
->lock
, flags
);
989 tty_flip_buffer_push(tty
);
991 schedule_work(&s
->work_rx
);
994 static void sci_start_rx(struct uart_port
*port
);
995 static void sci_start_tx(struct uart_port
*port
);
997 static void sci_rx_dma_release(struct sci_port
*s
, bool enable_pio
)
999 struct dma_chan
*chan
= s
->chan_rx
;
1000 struct uart_port
*port
= &s
->port
;
1003 s
->cookie_rx
[0] = s
->cookie_rx
[1] = -EINVAL
;
1004 dma_release_channel(chan
);
1005 dma_free_coherent(port
->dev
, s
->buf_len_rx
* 2,
1006 sg_virt(&s
->sg_rx
[0]), sg_dma_address(&s
->sg_rx
[0]));
1011 static void sci_tx_dma_release(struct sci_port
*s
, bool enable_pio
)
1013 struct dma_chan
*chan
= s
->chan_tx
;
1014 struct uart_port
*port
= &s
->port
;
1017 s
->cookie_tx
= -EINVAL
;
1018 dma_release_channel(chan
);
1023 static void sci_submit_rx(struct sci_port
*s
)
1025 struct dma_chan
*chan
= s
->chan_rx
;
1028 for (i
= 0; i
< 2; i
++) {
1029 struct scatterlist
*sg
= &s
->sg_rx
[i
];
1030 struct dma_async_tx_descriptor
*desc
;
1032 desc
= chan
->device
->device_prep_slave_sg(chan
,
1033 sg
, 1, DMA_FROM_DEVICE
, DMA_PREP_INTERRUPT
);
1036 s
->desc_rx
[i
] = desc
;
1037 desc
->callback
= sci_dma_rx_complete
;
1038 desc
->callback_param
= s
;
1039 s
->cookie_rx
[i
] = desc
->tx_submit(desc
);
1042 if (!desc
|| s
->cookie_rx
[i
] < 0) {
1044 async_tx_ack(s
->desc_rx
[0]);
1045 s
->cookie_rx
[0] = -EINVAL
;
1049 s
->cookie_rx
[i
] = -EINVAL
;
1051 dev_warn(s
->port
.dev
,
1052 "failed to re-start DMA, using PIO\n");
1053 sci_rx_dma_release(s
, true);
1058 s
->active_rx
= s
->cookie_rx
[0];
1060 dma_async_issue_pending(chan
);
1063 static void work_fn_rx(struct work_struct
*work
)
1065 struct sci_port
*s
= container_of(work
, struct sci_port
, work_rx
);
1066 struct uart_port
*port
= &s
->port
;
1067 struct dma_async_tx_descriptor
*desc
;
1070 if (s
->active_rx
== s
->cookie_rx
[0]) {
1072 } else if (s
->active_rx
== s
->cookie_rx
[1]) {
1075 dev_err(port
->dev
, "cookie %d not found!\n", s
->active_rx
);
1078 desc
= s
->desc_rx
[new];
1080 if (dma_async_is_tx_complete(s
->chan_rx
, s
->active_rx
, NULL
, NULL
) !=
1082 /* Handle incomplete DMA receive */
1083 struct tty_struct
*tty
= port
->state
->port
.tty
;
1084 struct dma_chan
*chan
= s
->chan_rx
;
1085 struct sh_desc
*sh_desc
= container_of(desc
, struct sh_desc
,
1087 unsigned long flags
;
1090 chan
->device
->device_control(chan
, DMA_TERMINATE_ALL
);
1091 dev_dbg(port
->dev
, "Read %u bytes with cookie %d\n",
1092 sh_desc
->partial
, sh_desc
->cookie
);
1094 spin_lock_irqsave(&port
->lock
, flags
);
1095 count
= sci_dma_rx_push(s
, tty
, sh_desc
->partial
);
1096 spin_unlock_irqrestore(&port
->lock
, flags
);
1099 tty_flip_buffer_push(tty
);
1106 s
->cookie_rx
[new] = desc
->tx_submit(desc
);
1107 if (s
->cookie_rx
[new] < 0) {
1108 dev_warn(port
->dev
, "Failed submitting Rx DMA descriptor\n");
1109 sci_rx_dma_release(s
, true);
1113 dev_dbg(port
->dev
, "%s: cookie %d #%d\n", __func__
,
1114 s
->cookie_rx
[new], new);
1116 s
->active_rx
= s
->cookie_rx
[!new];
1119 static void work_fn_tx(struct work_struct
*work
)
1121 struct sci_port
*s
= container_of(work
, struct sci_port
, work_tx
);
1122 struct dma_async_tx_descriptor
*desc
;
1123 struct dma_chan
*chan
= s
->chan_tx
;
1124 struct uart_port
*port
= &s
->port
;
1125 struct circ_buf
*xmit
= &port
->state
->xmit
;
1126 struct scatterlist
*sg
= &s
->sg_tx
;
1130 * Port xmit buffer is already mapped, and it is one page... Just adjust
1131 * offsets and lengths. Since it is a circular buffer, we have to
1132 * transmit till the end, and then the rest. Take the port lock to get a
1133 * consistent xmit buffer state.
1135 spin_lock_irq(&port
->lock
);
1136 sg
->offset
= xmit
->tail
& (UART_XMIT_SIZE
- 1);
1137 sg
->dma_address
= (sg_dma_address(sg
) & ~(UART_XMIT_SIZE
- 1)) +
1139 sg
->length
= min((int)CIRC_CNT(xmit
->head
, xmit
->tail
, UART_XMIT_SIZE
),
1140 CIRC_CNT_TO_END(xmit
->head
, xmit
->tail
, UART_XMIT_SIZE
));
1141 sg
->dma_length
= sg
->length
;
1142 spin_unlock_irq(&port
->lock
);
1144 BUG_ON(!sg
->length
);
1146 desc
= chan
->device
->device_prep_slave_sg(chan
,
1147 sg
, s
->sg_len_tx
, DMA_TO_DEVICE
,
1148 DMA_PREP_INTERRUPT
| DMA_CTRL_ACK
);
1151 sci_tx_dma_release(s
, true);
1155 dma_sync_sg_for_device(port
->dev
, sg
, 1, DMA_TO_DEVICE
);
1157 spin_lock_irq(&port
->lock
);
1159 desc
->callback
= sci_dma_tx_complete
;
1160 desc
->callback_param
= s
;
1161 spin_unlock_irq(&port
->lock
);
1162 s
->cookie_tx
= desc
->tx_submit(desc
);
1163 if (s
->cookie_tx
< 0) {
1164 dev_warn(port
->dev
, "Failed submitting Tx DMA descriptor\n");
1166 sci_tx_dma_release(s
, true);
1170 dev_dbg(port
->dev
, "%s: %p: %d...%d, cookie %d\n", __func__
,
1171 xmit
->buf
, xmit
->tail
, xmit
->head
, s
->cookie_tx
);
1173 dma_async_issue_pending(chan
);
1177 static void sci_start_tx(struct uart_port
*port
)
1179 unsigned short ctrl
;
1181 #ifdef CONFIG_SERIAL_SH_SCI_DMA
1182 struct sci_port
*s
= to_sci_port(port
);
1185 if (!uart_circ_empty(&s
->port
.state
->xmit
) && s
->cookie_tx
< 0)
1186 schedule_work(&s
->work_tx
);
1192 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
1193 ctrl
= sci_in(port
, SCSCR
);
1194 ctrl
|= SCI_CTRL_FLAGS_TIE
;
1195 sci_out(port
, SCSCR
, ctrl
);
1198 static void sci_stop_tx(struct uart_port
*port
)
1200 unsigned short ctrl
;
1202 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
1203 ctrl
= sci_in(port
, SCSCR
);
1204 ctrl
&= ~SCI_CTRL_FLAGS_TIE
;
1205 sci_out(port
, SCSCR
, ctrl
);
1208 static void sci_start_rx(struct uart_port
*port
)
1210 unsigned short ctrl
= SCI_CTRL_FLAGS_RIE
| SCI_CTRL_FLAGS_REIE
;
1212 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
1213 ctrl
|= sci_in(port
, SCSCR
);
1214 sci_out(port
, SCSCR
, ctrl
);
1217 static void sci_stop_rx(struct uart_port
*port
)
1219 unsigned short ctrl
;
1221 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
1222 ctrl
= sci_in(port
, SCSCR
);
1223 ctrl
&= ~(SCI_CTRL_FLAGS_RIE
| SCI_CTRL_FLAGS_REIE
);
1224 sci_out(port
, SCSCR
, ctrl
);
1227 static void sci_enable_ms(struct uart_port
*port
)
1229 /* Nothing here yet .. */
1232 static void sci_break_ctl(struct uart_port
*port
, int break_state
)
1234 /* Nothing here yet .. */
1237 #ifdef CONFIG_SERIAL_SH_SCI_DMA
1238 static bool filter(struct dma_chan
*chan
, void *slave
)
1240 struct sh_dmae_slave
*param
= slave
;
1242 dev_dbg(chan
->device
->dev
, "%s: slave ID %d\n", __func__
,
1245 if (param
->dma_dev
== chan
->device
->dev
) {
1246 chan
->private = param
;
1253 static void rx_timer_fn(unsigned long arg
)
1255 struct sci_port
*s
= (struct sci_port
*)arg
;
1256 struct uart_port
*port
= &s
->port
;
1258 u16 scr
= sci_in(port
, SCSCR
);
1259 sci_out(port
, SCSCR
, scr
| SCI_CTRL_FLAGS_RIE
);
1260 dev_dbg(port
->dev
, "DMA Rx timed out\n");
1261 schedule_work(&s
->work_rx
);
1264 static void sci_request_dma(struct uart_port
*port
)
1266 struct sci_port
*s
= to_sci_port(port
);
1267 struct sh_dmae_slave
*param
;
1268 struct dma_chan
*chan
;
1269 dma_cap_mask_t mask
;
1272 dev_dbg(port
->dev
, "%s: port %d DMA %p\n", __func__
,
1273 port
->line
, s
->dma_dev
);
1279 dma_cap_set(DMA_SLAVE
, mask
);
1281 param
= &s
->param_tx
;
1283 /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */
1284 param
->slave_id
= s
->slave_tx
;
1285 param
->dma_dev
= s
->dma_dev
;
1287 s
->cookie_tx
= -EINVAL
;
1288 chan
= dma_request_channel(mask
, filter
, param
);
1289 dev_dbg(port
->dev
, "%s: TX: got channel %p\n", __func__
, chan
);
1292 sg_init_table(&s
->sg_tx
, 1);
1293 /* UART circular tx buffer is an aligned page. */
1294 BUG_ON((int)port
->state
->xmit
.buf
& ~PAGE_MASK
);
1295 sg_set_page(&s
->sg_tx
, virt_to_page(port
->state
->xmit
.buf
),
1296 UART_XMIT_SIZE
, (int)port
->state
->xmit
.buf
& ~PAGE_MASK
);
1297 nent
= dma_map_sg(port
->dev
, &s
->sg_tx
, 1, DMA_TO_DEVICE
);
1299 sci_tx_dma_release(s
, false);
1301 dev_dbg(port
->dev
, "%s: mapped %d@%p to %x\n", __func__
,
1302 sg_dma_len(&s
->sg_tx
),
1303 port
->state
->xmit
.buf
, sg_dma_address(&s
->sg_tx
));
1305 s
->sg_len_tx
= nent
;
1307 INIT_WORK(&s
->work_tx
, work_fn_tx
);
1310 param
= &s
->param_rx
;
1312 /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */
1313 param
->slave_id
= s
->slave_rx
;
1314 param
->dma_dev
= s
->dma_dev
;
1316 chan
= dma_request_channel(mask
, filter
, param
);
1317 dev_dbg(port
->dev
, "%s: RX: got channel %p\n", __func__
, chan
);
1325 s
->buf_len_rx
= 2 * max(16, (int)port
->fifosize
);
1326 buf
[0] = dma_alloc_coherent(port
->dev
, s
->buf_len_rx
* 2,
1327 &dma
[0], GFP_KERNEL
);
1331 "failed to allocate dma buffer, using PIO\n");
1332 sci_rx_dma_release(s
, true);
1336 buf
[1] = buf
[0] + s
->buf_len_rx
;
1337 dma
[1] = dma
[0] + s
->buf_len_rx
;
1339 for (i
= 0; i
< 2; i
++) {
1340 struct scatterlist
*sg
= &s
->sg_rx
[i
];
1342 sg_init_table(sg
, 1);
1343 sg_set_page(sg
, virt_to_page(buf
[i
]), s
->buf_len_rx
,
1344 (int)buf
[i
] & ~PAGE_MASK
);
1345 sg
->dma_address
= dma
[i
];
1346 sg
->dma_length
= sg
->length
;
1349 INIT_WORK(&s
->work_rx
, work_fn_rx
);
1350 setup_timer(&s
->rx_timer
, rx_timer_fn
, (unsigned long)s
);
1356 static void sci_free_dma(struct uart_port
*port
)
1358 struct sci_port
*s
= to_sci_port(port
);
1364 sci_tx_dma_release(s
, false);
1366 sci_rx_dma_release(s
, false);
1370 static int sci_startup(struct uart_port
*port
)
1372 struct sci_port
*s
= to_sci_port(port
);
1374 dev_dbg(port
->dev
, "%s(%d)\n", __func__
, port
->line
);
1380 #ifdef CONFIG_SERIAL_SH_SCI_DMA
1381 sci_request_dma(port
);
1389 static void sci_shutdown(struct uart_port
*port
)
1391 struct sci_port
*s
= to_sci_port(port
);
1393 dev_dbg(port
->dev
, "%s(%d)\n", __func__
, port
->line
);
1397 #ifdef CONFIG_SERIAL_SH_SCI_DMA
1406 static void sci_set_termios(struct uart_port
*port
, struct ktermios
*termios
,
1407 struct ktermios
*old
)
1409 unsigned int status
, baud
, smr_val
, max_baud
;
1413 * earlyprintk comes here early on with port->uartclk set to zero.
1414 * the clock framework is not up and running at this point so here
1415 * we assume that 115200 is the maximum baud rate. please note that
1416 * the baud rate is not programmed during earlyprintk - it is assumed
1417 * that the previous boot loader has enabled required clocks and
1418 * setup the baud rate generator hardware for us already.
1420 max_baud
= port
->uartclk
? port
->uartclk
/ 16 : 115200;
1422 baud
= uart_get_baud_rate(port
, termios
, old
, 0, max_baud
);
1423 if (likely(baud
&& port
->uartclk
))
1424 t
= SCBRR_VALUE(baud
, port
->uartclk
);
1427 status
= sci_in(port
, SCxSR
);
1428 } while (!(status
& SCxSR_TEND(port
)));
1430 sci_out(port
, SCSCR
, 0x00); /* TE=0, RE=0, CKE1=0 */
1432 if (port
->type
!= PORT_SCI
)
1433 sci_out(port
, SCFCR
, SCFCR_RFRST
| SCFCR_TFRST
);
1435 smr_val
= sci_in(port
, SCSMR
) & 3;
1436 if ((termios
->c_cflag
& CSIZE
) == CS7
)
1438 if (termios
->c_cflag
& PARENB
)
1440 if (termios
->c_cflag
& PARODD
)
1442 if (termios
->c_cflag
& CSTOPB
)
1445 uart_update_timeout(port
, termios
->c_cflag
, baud
);
1447 sci_out(port
, SCSMR
, smr_val
);
1449 dev_dbg(port
->dev
, "%s: SMR %x, t %x, SCSCR %x\n", __func__
, smr_val
, t
,
1454 sci_out(port
, SCSMR
, (sci_in(port
, SCSMR
) & ~3) | 1);
1457 sci_out(port
, SCSMR
, sci_in(port
, SCSMR
) & ~3);
1459 sci_out(port
, SCBRR
, t
);
1460 udelay((1000000+(baud
-1)) / baud
); /* Wait one bit interval */
1463 sci_init_pins(port
, termios
->c_cflag
);
1464 sci_out(port
, SCFCR
, (termios
->c_cflag
& CRTSCTS
) ? SCFCR_MCE
: 0);
1466 sci_out(port
, SCSCR
, SCSCR_INIT(port
));
1468 if ((termios
->c_cflag
& CREAD
) != 0)
1472 static const char *sci_type(struct uart_port
*port
)
1474 switch (port
->type
) {
1488 static void sci_release_port(struct uart_port
*port
)
1490 /* Nothing here yet .. */
1493 static int sci_request_port(struct uart_port
*port
)
1495 /* Nothing here yet .. */
1499 static void sci_config_port(struct uart_port
*port
, int flags
)
1501 struct sci_port
*s
= to_sci_port(port
);
1503 port
->type
= s
->type
;
1508 if (port
->flags
& UPF_IOREMAP
) {
1509 port
->membase
= ioremap_nocache(port
->mapbase
, 0x40);
1511 if (IS_ERR(port
->membase
))
1512 dev_err(port
->dev
, "can't remap port#%d\n", port
->line
);
1515 * For the simple (and majority of) cases where we don't
1516 * need to do any remapping, just cast the cookie
1519 port
->membase
= (void __iomem
*)port
->mapbase
;
1523 static int sci_verify_port(struct uart_port
*port
, struct serial_struct
*ser
)
1525 struct sci_port
*s
= to_sci_port(port
);
1527 if (ser
->irq
!= s
->irqs
[SCIx_TXI_IRQ
] || ser
->irq
> nr_irqs
)
1529 if (ser
->baud_base
< 2400)
1530 /* No paper tape reader for Mitch.. */
1536 static struct uart_ops sci_uart_ops
= {
1537 .tx_empty
= sci_tx_empty
,
1538 .set_mctrl
= sci_set_mctrl
,
1539 .get_mctrl
= sci_get_mctrl
,
1540 .start_tx
= sci_start_tx
,
1541 .stop_tx
= sci_stop_tx
,
1542 .stop_rx
= sci_stop_rx
,
1543 .enable_ms
= sci_enable_ms
,
1544 .break_ctl
= sci_break_ctl
,
1545 .startup
= sci_startup
,
1546 .shutdown
= sci_shutdown
,
1547 .set_termios
= sci_set_termios
,
1549 .release_port
= sci_release_port
,
1550 .request_port
= sci_request_port
,
1551 .config_port
= sci_config_port
,
1552 .verify_port
= sci_verify_port
,
1553 #ifdef CONFIG_CONSOLE_POLL
1554 .poll_get_char
= sci_poll_get_char
,
1555 .poll_put_char
= sci_poll_put_char
,
1559 static void __devinit
sci_init_single(struct platform_device
*dev
,
1560 struct sci_port
*sci_port
,
1562 struct plat_sci_port
*p
)
1564 struct uart_port
*port
= &sci_port
->port
;
1566 port
->ops
= &sci_uart_ops
;
1567 port
->iotype
= UPIO_MEM
;
1572 port
->fifosize
= 64;
1575 port
->fifosize
= 16;
1583 sci_port
->iclk
= p
->clk
? clk_get(&dev
->dev
, p
->clk
) : NULL
;
1584 sci_port
->dclk
= clk_get(&dev
->dev
, "peripheral_clk");
1585 sci_port
->enable
= sci_clk_enable
;
1586 sci_port
->disable
= sci_clk_disable
;
1587 port
->dev
= &dev
->dev
;
1590 sci_port
->break_timer
.data
= (unsigned long)sci_port
;
1591 sci_port
->break_timer
.function
= sci_break_timer
;
1592 init_timer(&sci_port
->break_timer
);
1594 port
->mapbase
= p
->mapbase
;
1595 port
->membase
= p
->membase
;
1597 port
->irq
= p
->irqs
[SCIx_TXI_IRQ
];
1598 port
->flags
= p
->flags
;
1599 sci_port
->type
= port
->type
= p
->type
;
1601 #ifdef CONFIG_SERIAL_SH_SCI_DMA
1602 sci_port
->dma_dev
= p
->dma_dev
;
1603 sci_port
->slave_tx
= p
->dma_slave_tx
;
1604 sci_port
->slave_rx
= p
->dma_slave_rx
;
1606 dev_dbg(port
->dev
, "%s: DMA device %p, tx %d, rx %d\n", __func__
,
1607 p
->dma_dev
, p
->dma_slave_tx
, p
->dma_slave_rx
);
1610 memcpy(&sci_port
->irqs
, &p
->irqs
, sizeof(p
->irqs
));
1613 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1614 static struct tty_driver
*serial_console_device(struct console
*co
, int *index
)
1616 struct uart_driver
*p
= &sci_uart_driver
;
1618 return p
->tty_driver
;
1621 static void serial_console_putchar(struct uart_port
*port
, int ch
)
1623 sci_poll_put_char(port
, ch
);
1627 * Print a string to the serial port trying not to disturb
1628 * any possible real use of the port...
1630 static void serial_console_write(struct console
*co
, const char *s
,
1633 struct uart_port
*port
= co
->data
;
1634 struct sci_port
*sci_port
= to_sci_port(port
);
1635 unsigned short bits
;
1637 if (sci_port
->enable
)
1638 sci_port
->enable(port
);
1640 uart_console_write(port
, s
, count
, serial_console_putchar
);
1642 /* wait until fifo is empty and last bit has been transmitted */
1643 bits
= SCxSR_TDxE(port
) | SCxSR_TEND(port
);
1644 while ((sci_in(port
, SCxSR
) & bits
) != bits
)
1647 if (sci_port
->disable
)
1648 sci_port
->disable(port
);
1651 static int __devinit
serial_console_setup(struct console
*co
, char *options
)
1653 struct sci_port
*sci_port
;
1654 struct uart_port
*port
;
1662 * Check whether an invalid uart number has been specified, and
1663 * if so, search for the first available port that does have
1666 if (co
->index
>= SCI_NPORTS
)
1671 sci_port
= to_sci_port(port
);
1673 sci_port
= &sci_ports
[co
->index
];
1674 port
= &sci_port
->port
;
1679 * Also need to check port->type, we don't actually have any
1680 * UPIO_PORT ports, but uart_report_port() handily misreports
1681 * it anyways if we don't have a port available by the time this is
1687 sci_config_port(port
, 0);
1689 if (sci_port
->enable
)
1690 sci_port
->enable(port
);
1693 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
1695 ret
= uart_set_options(port
, co
, baud
, parity
, bits
, flow
);
1696 #if defined(__H8300H__) || defined(__H8300S__)
1697 /* disable rx interrupt */
1701 /* TODO: disable clock */
1705 static struct console serial_console
= {
1707 .device
= serial_console_device
,
1708 .write
= serial_console_write
,
1709 .setup
= serial_console_setup
,
1710 .flags
= CON_PRINTBUFFER
,
1714 static int __init
sci_console_init(void)
1716 register_console(&serial_console
);
1719 console_initcall(sci_console_init
);
1721 static struct sci_port early_serial_port
;
1722 static struct console early_serial_console
= {
1723 .name
= "early_ttySC",
1724 .write
= serial_console_write
,
1725 .flags
= CON_PRINTBUFFER
,
1727 static char early_serial_buf
[32];
1729 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1731 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1732 #define SCI_CONSOLE (&serial_console)
1734 #define SCI_CONSOLE 0
1737 static char banner
[] __initdata
=
1738 KERN_INFO
"SuperH SCI(F) driver initialized\n";
1740 static struct uart_driver sci_uart_driver
= {
1741 .owner
= THIS_MODULE
,
1742 .driver_name
= "sci",
1743 .dev_name
= "ttySC",
1745 .minor
= SCI_MINOR_START
,
1747 .cons
= SCI_CONSOLE
,
1751 static int sci_remove(struct platform_device
*dev
)
1753 struct sh_sci_priv
*priv
= platform_get_drvdata(dev
);
1755 unsigned long flags
;
1757 cpufreq_unregister_notifier(&priv
->clk_nb
, CPUFREQ_TRANSITION_NOTIFIER
);
1759 spin_lock_irqsave(&priv
->lock
, flags
);
1760 list_for_each_entry(p
, &priv
->ports
, node
)
1761 uart_remove_one_port(&sci_uart_driver
, &p
->port
);
1762 spin_unlock_irqrestore(&priv
->lock
, flags
);
1768 static int __devinit
sci_probe_single(struct platform_device
*dev
,
1770 struct plat_sci_port
*p
,
1771 struct sci_port
*sciport
)
1773 struct sh_sci_priv
*priv
= platform_get_drvdata(dev
);
1774 unsigned long flags
;
1778 if (unlikely(index
>= SCI_NPORTS
)) {
1779 dev_notice(&dev
->dev
, "Attempting to register port "
1780 "%d when only %d are available.\n",
1781 index
+1, SCI_NPORTS
);
1782 dev_notice(&dev
->dev
, "Consider bumping "
1783 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1787 sci_init_single(dev
, sciport
, index
, p
);
1789 ret
= uart_add_one_port(&sci_uart_driver
, &sciport
->port
);
1793 INIT_LIST_HEAD(&sciport
->node
);
1795 spin_lock_irqsave(&priv
->lock
, flags
);
1796 list_add(&sciport
->node
, &priv
->ports
);
1797 spin_unlock_irqrestore(&priv
->lock
, flags
);
1803 * Register a set of serial devices attached to a platform device. The
1804 * list is terminated with a zero flags entry, which means we expect
1805 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1806 * remapping (such as sh64) should also set UPF_IOREMAP.
1808 static int __devinit
sci_probe(struct platform_device
*dev
)
1810 struct plat_sci_port
*p
= dev
->dev
.platform_data
;
1811 struct sh_sci_priv
*priv
;
1812 int i
, ret
= -EINVAL
;
1814 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1815 if (is_early_platform_device(dev
)) {
1818 early_serial_console
.index
= dev
->id
;
1819 early_serial_console
.data
= &early_serial_port
.port
;
1820 sci_init_single(NULL
, &early_serial_port
, dev
->id
, p
);
1821 serial_console_setup(&early_serial_console
, early_serial_buf
);
1822 if (!strstr(early_serial_buf
, "keep"))
1823 early_serial_console
.flags
|= CON_BOOT
;
1824 register_console(&early_serial_console
);
1829 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
1833 INIT_LIST_HEAD(&priv
->ports
);
1834 spin_lock_init(&priv
->lock
);
1835 platform_set_drvdata(dev
, priv
);
1837 priv
->clk_nb
.notifier_call
= sci_notifier
;
1838 cpufreq_register_notifier(&priv
->clk_nb
, CPUFREQ_TRANSITION_NOTIFIER
);
1840 if (dev
->id
!= -1) {
1841 ret
= sci_probe_single(dev
, dev
->id
, p
, &sci_ports
[dev
->id
]);
1845 for (i
= 0; p
&& p
->flags
!= 0; p
++, i
++) {
1846 ret
= sci_probe_single(dev
, i
, p
, &sci_ports
[i
]);
1852 #ifdef CONFIG_SH_STANDARD_BIOS
1853 sh_bios_gdb_detach();
1863 static int sci_suspend(struct device
*dev
)
1865 struct sh_sci_priv
*priv
= dev_get_drvdata(dev
);
1867 unsigned long flags
;
1869 spin_lock_irqsave(&priv
->lock
, flags
);
1870 list_for_each_entry(p
, &priv
->ports
, node
)
1871 uart_suspend_port(&sci_uart_driver
, &p
->port
);
1872 spin_unlock_irqrestore(&priv
->lock
, flags
);
1877 static int sci_resume(struct device
*dev
)
1879 struct sh_sci_priv
*priv
= dev_get_drvdata(dev
);
1881 unsigned long flags
;
1883 spin_lock_irqsave(&priv
->lock
, flags
);
1884 list_for_each_entry(p
, &priv
->ports
, node
)
1885 uart_resume_port(&sci_uart_driver
, &p
->port
);
1886 spin_unlock_irqrestore(&priv
->lock
, flags
);
1891 static const struct dev_pm_ops sci_dev_pm_ops
= {
1892 .suspend
= sci_suspend
,
1893 .resume
= sci_resume
,
1896 static struct platform_driver sci_driver
= {
1898 .remove
= sci_remove
,
1901 .owner
= THIS_MODULE
,
1902 .pm
= &sci_dev_pm_ops
,
1906 static int __init
sci_init(void)
1912 ret
= uart_register_driver(&sci_uart_driver
);
1913 if (likely(ret
== 0)) {
1914 ret
= platform_driver_register(&sci_driver
);
1916 uart_unregister_driver(&sci_uart_driver
);
1922 static void __exit
sci_exit(void)
1924 platform_driver_unregister(&sci_driver
);
1925 uart_unregister_driver(&sci_uart_driver
);
1928 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1929 early_platform_init_buffer("earlyprintk", &sci_driver
,
1930 early_serial_buf
, ARRAY_SIZE(early_serial_buf
));
1932 module_init(sci_init
);
1933 module_exit(sci_exit
);
1935 MODULE_LICENSE("GPL");
1936 MODULE_ALIAS("platform:sh-sci");