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>
52 #include <asm/clock.h>
53 #include <asm/sh_bios.h>
59 struct uart_port port;
64 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
65 unsigned int irqs[SCIx_NR_IRQS];
67 /* Port enable callback */
68 void (*enable)(struct uart_port *port);
70 /* Port disable callback */
71 void (*disable)(struct uart_port *port);
74 struct timer_list break_timer;
77 #ifdef CONFIG_HAVE_CLK
83 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
84 static struct sci_port *serial_console_port;
87 /* Function prototypes */
88 static void sci_stop_tx(struct uart_port *port);
90 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
92 static struct sci_port sci_ports[SCI_NPORTS];
93 static struct uart_driver sci_uart_driver;
95 static inline struct sci_port *
96 to_sci_port(struct uart_port *uart)
98 return container_of(uart, struct sci_port, port);
101 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
103 #ifdef CONFIG_CONSOLE_POLL
104 static inline void handle_error(struct uart_port *port)
106 /* Clear error flags */
107 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
110 static int sci_poll_get_char(struct uart_port *port)
112 unsigned short status;
116 status = sci_in(port, SCxSR);
117 if (status & SCxSR_ERRORS(port)) {
121 } while (!(status & SCxSR_RDxF(port)));
123 c = sci_in(port, SCxRDR);
127 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
133 static void sci_poll_put_char(struct uart_port *port, unsigned char c)
135 unsigned short status;
138 status = sci_in(port, SCxSR);
139 } while (!(status & SCxSR_TDxE(port)));
141 sci_in(port, SCxSR); /* Dummy read */
142 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port));
143 sci_out(port, SCxTDR, c);
145 #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
147 #if defined(__H8300S__)
148 enum { sci_disable, sci_enable };
150 static void h8300_sci_config(struct uart_port *port, unsigned int ctrl)
152 volatile unsigned char *mstpcrl = (volatile unsigned char *)MSTPCRL;
153 int ch = (port->mapbase - SMR0) >> 3;
154 unsigned char mask = 1 << (ch+1);
156 if (ctrl == sci_disable)
162 static inline void h8300_sci_enable(struct uart_port *port)
164 h8300_sci_config(port, sci_enable);
167 static inline void h8300_sci_disable(struct uart_port *port)
169 h8300_sci_config(port, sci_disable);
173 #if defined(__H8300H__) || defined(__H8300S__)
174 static void sci_init_pins(struct uart_port *port, unsigned int cflag)
176 int ch = (port->mapbase - SMR0) >> 3;
179 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
180 h8300_sci_pins[ch].rx,
182 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
183 h8300_sci_pins[ch].tx,
187 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
189 #elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
190 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
192 if (port->mapbase == 0xA4400000) {
193 __raw_writew(__raw_readw(PACR) & 0xffc0, PACR);
194 __raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR);
195 } else if (port->mapbase == 0xA4410000)
196 __raw_writew(__raw_readw(PBCR) & 0xf003, PBCR);
198 #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
199 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
203 if (cflag & CRTSCTS) {
205 if (port->mapbase == 0xa4430000) { /* SCIF0 */
206 /* Clear PTCR bit 9-2; enable all scif pins but sck */
207 data = __raw_readw(PORT_PTCR);
208 __raw_writew((data & 0xfc03), PORT_PTCR);
209 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
210 /* Clear PVCR bit 9-2 */
211 data = __raw_readw(PORT_PVCR);
212 __raw_writew((data & 0xfc03), PORT_PVCR);
215 if (port->mapbase == 0xa4430000) { /* SCIF0 */
216 /* Clear PTCR bit 5-2; enable only tx and rx */
217 data = __raw_readw(PORT_PTCR);
218 __raw_writew((data & 0xffc3), PORT_PTCR);
219 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
220 /* Clear PVCR bit 5-2 */
221 data = __raw_readw(PORT_PVCR);
222 __raw_writew((data & 0xffc3), PORT_PVCR);
226 #elif defined(CONFIG_CPU_SH3)
227 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
228 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
232 /* We need to set SCPCR to enable RTS/CTS */
233 data = __raw_readw(SCPCR);
234 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
235 __raw_writew(data & 0x0fcf, SCPCR);
237 if (!(cflag & CRTSCTS)) {
238 /* We need to set SCPCR to enable RTS/CTS */
239 data = __raw_readw(SCPCR);
240 /* Clear out SCP7MD1,0, SCP4MD1,0,
241 Set SCP6MD1,0 = {01} (output) */
242 __raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
244 data = ctrl_inb(SCPDR);
245 /* Set /RTS2 (bit6) = 0 */
246 ctrl_outb(data & 0xbf, SCPDR);
249 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
250 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
254 if (port->mapbase == 0xffe00000) {
255 data = __raw_readw(PSCR);
257 if (!(cflag & CRTSCTS))
260 __raw_writew(data, PSCR);
263 #elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \
264 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
265 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
266 defined(CONFIG_CPU_SUBTYPE_SH7786) || \
267 defined(CONFIG_CPU_SUBTYPE_SHX3)
268 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
270 if (!(cflag & CRTSCTS))
271 __raw_writew(0x0080, SCSPTR0); /* Set RTS = 1 */
273 #elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A)
274 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
276 if (!(cflag & CRTSCTS))
277 __raw_writew(0x0080, SCSPTR2); /* Set RTS = 1 */
280 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
286 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
287 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
288 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
289 defined(CONFIG_CPU_SUBTYPE_SH7786)
290 static inline int scif_txroom(struct uart_port *port)
292 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
295 static inline int scif_rxroom(struct uart_port *port)
297 return sci_in(port, SCRFDR) & 0xff;
299 #elif defined(CONFIG_CPU_SUBTYPE_SH7763)
300 static inline int scif_txroom(struct uart_port *port)
302 if ((port->mapbase == 0xffe00000) ||
303 (port->mapbase == 0xffe08000)) {
305 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
308 return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
312 static inline int scif_rxroom(struct uart_port *port)
314 if ((port->mapbase == 0xffe00000) ||
315 (port->mapbase == 0xffe08000)) {
317 return sci_in(port, SCRFDR) & 0xff;
320 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
324 static inline int scif_txroom(struct uart_port *port)
326 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
329 static inline int scif_rxroom(struct uart_port *port)
331 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
335 static inline int sci_txroom(struct uart_port *port)
337 return (sci_in(port, SCxSR) & SCI_TDRE) != 0;
340 static inline int sci_rxroom(struct uart_port *port)
342 return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
345 /* ********************************************************************** *
346 * the interrupt related routines *
347 * ********************************************************************** */
349 static void sci_transmit_chars(struct uart_port *port)
351 struct circ_buf *xmit = &port->info->xmit;
352 unsigned int stopped = uart_tx_stopped(port);
353 unsigned short status;
357 status = sci_in(port, SCxSR);
358 if (!(status & SCxSR_TDxE(port))) {
359 ctrl = sci_in(port, SCSCR);
360 if (uart_circ_empty(xmit))
361 ctrl &= ~SCI_CTRL_FLAGS_TIE;
363 ctrl |= SCI_CTRL_FLAGS_TIE;
364 sci_out(port, SCSCR, ctrl);
368 if (port->type == PORT_SCI)
369 count = sci_txroom(port);
371 count = scif_txroom(port);
379 } else if (!uart_circ_empty(xmit) && !stopped) {
380 c = xmit->buf[xmit->tail];
381 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
386 sci_out(port, SCxTDR, c);
389 } while (--count > 0);
391 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
393 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
394 uart_write_wakeup(port);
395 if (uart_circ_empty(xmit)) {
398 ctrl = sci_in(port, SCSCR);
400 if (port->type != PORT_SCI) {
401 sci_in(port, SCxSR); /* Dummy read */
402 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
405 ctrl |= SCI_CTRL_FLAGS_TIE;
406 sci_out(port, SCSCR, ctrl);
410 /* On SH3, SCIF may read end-of-break as a space->mark char */
411 #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); })
413 static inline void sci_receive_chars(struct uart_port *port)
415 struct sci_port *sci_port = to_sci_port(port);
416 struct tty_struct *tty = port->info->port.tty;
417 int i, count, copied = 0;
418 unsigned short status;
421 status = sci_in(port, SCxSR);
422 if (!(status & SCxSR_RDxF(port)))
426 if (port->type == PORT_SCI)
427 count = sci_rxroom(port);
429 count = scif_rxroom(port);
431 /* Don't copy more bytes than there is room for in the buffer */
432 count = tty_buffer_request_room(tty, count);
434 /* If for any reason we can't copy more data, we're done! */
438 if (port->type == PORT_SCI) {
439 char c = sci_in(port, SCxRDR);
440 if (uart_handle_sysrq_char(port, c) ||
441 sci_port->break_flag)
444 tty_insert_flip_char(tty, c, TTY_NORMAL);
446 for (i = 0; i < count; i++) {
447 char c = sci_in(port, SCxRDR);
448 status = sci_in(port, SCxSR);
449 #if defined(CONFIG_CPU_SH3)
450 /* Skip "chars" during break */
451 if (sci_port->break_flag) {
453 (status & SCxSR_FER(port))) {
458 /* Nonzero => end-of-break */
459 dev_dbg(port->dev, "debounce<%02x>\n", c);
460 sci_port->break_flag = 0;
467 #endif /* CONFIG_CPU_SH3 */
468 if (uart_handle_sysrq_char(port, c)) {
473 /* Store data and status */
474 if (status&SCxSR_FER(port)) {
476 dev_notice(port->dev, "frame error\n");
477 } else if (status&SCxSR_PER(port)) {
479 dev_notice(port->dev, "parity error\n");
483 tty_insert_flip_char(tty, c, flag);
487 sci_in(port, SCxSR); /* dummy read */
488 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
491 port->icount.rx += count;
495 /* Tell the rest of the system the news. New characters! */
496 tty_flip_buffer_push(tty);
498 sci_in(port, SCxSR); /* dummy read */
499 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
503 #define SCI_BREAK_JIFFIES (HZ/20)
504 /* The sci generates interrupts during the break,
505 * 1 per millisecond or so during the break period, for 9600 baud.
506 * So dont bother disabling interrupts.
507 * But dont want more than 1 break event.
508 * Use a kernel timer to periodically poll the rx line until
509 * the break is finished.
511 static void sci_schedule_break_timer(struct sci_port *port)
513 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
514 add_timer(&port->break_timer);
516 /* Ensure that two consecutive samples find the break over. */
517 static void sci_break_timer(unsigned long data)
519 struct sci_port *port = (struct sci_port *)data;
521 if (sci_rxd_in(&port->port) == 0) {
522 port->break_flag = 1;
523 sci_schedule_break_timer(port);
524 } else if (port->break_flag == 1) {
526 port->break_flag = 2;
527 sci_schedule_break_timer(port);
529 port->break_flag = 0;
532 static inline int sci_handle_errors(struct uart_port *port)
535 unsigned short status = sci_in(port, SCxSR);
536 struct tty_struct *tty = port->info->port.tty;
538 if (status & SCxSR_ORER(port)) {
540 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
543 dev_notice(port->dev, "overrun error");
546 if (status & SCxSR_FER(port)) {
547 if (sci_rxd_in(port) == 0) {
548 /* Notify of BREAK */
549 struct sci_port *sci_port = to_sci_port(port);
551 if (!sci_port->break_flag) {
552 sci_port->break_flag = 1;
553 sci_schedule_break_timer(sci_port);
555 /* Do sysrq handling. */
556 if (uart_handle_break(port))
559 dev_dbg(port->dev, "BREAK detected\n");
561 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
567 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
570 dev_notice(port->dev, "frame error\n");
574 if (status & SCxSR_PER(port)) {
576 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
579 dev_notice(port->dev, "parity error");
583 tty_flip_buffer_push(tty);
588 static inline int sci_handle_fifo_overrun(struct uart_port *port)
590 struct tty_struct *tty = port->info->port.tty;
593 if (port->type != PORT_SCIF)
596 if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
597 sci_out(port, SCLSR, 0);
599 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
600 tty_flip_buffer_push(tty);
602 dev_notice(port->dev, "overrun error\n");
609 static inline int sci_handle_breaks(struct uart_port *port)
612 unsigned short status = sci_in(port, SCxSR);
613 struct tty_struct *tty = port->info->port.tty;
614 struct sci_port *s = &sci_ports[port->line];
616 if (uart_handle_break(port))
619 if (!s->break_flag && status & SCxSR_BRK(port)) {
620 #if defined(CONFIG_CPU_SH3)
624 /* Notify of BREAK */
625 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
628 dev_dbg(port->dev, "BREAK detected\n");
632 tty_flip_buffer_push(tty);
634 copied += sci_handle_fifo_overrun(port);
639 static irqreturn_t sci_rx_interrupt(int irq, void *port)
641 /* I think sci_receive_chars has to be called irrespective
642 * of whether the I_IXOFF is set, otherwise, how is the interrupt
645 sci_receive_chars(port);
650 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
652 struct uart_port *port = ptr;
654 spin_lock_irq(&port->lock);
655 sci_transmit_chars(port);
656 spin_unlock_irq(&port->lock);
661 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
663 struct uart_port *port = ptr;
666 if (port->type == PORT_SCI) {
667 if (sci_handle_errors(port)) {
668 /* discard character in rx buffer */
670 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
673 sci_handle_fifo_overrun(port);
674 sci_rx_interrupt(irq, ptr);
677 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
679 /* Kick the transmission */
680 sci_tx_interrupt(irq, ptr);
685 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
687 struct uart_port *port = ptr;
690 sci_handle_breaks(port);
691 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
696 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
698 unsigned short ssr_status, scr_status;
699 struct uart_port *port = ptr;
700 irqreturn_t ret = IRQ_NONE;
702 ssr_status = sci_in(port, SCxSR);
703 scr_status = sci_in(port, SCSCR);
706 if ((ssr_status & 0x0020) && (scr_status & SCI_CTRL_FLAGS_TIE))
707 ret = sci_tx_interrupt(irq, ptr);
709 if ((ssr_status & 0x0002) && (scr_status & SCI_CTRL_FLAGS_RIE))
710 ret = sci_rx_interrupt(irq, ptr);
711 /* Error Interrupt */
712 if ((ssr_status & 0x0080) && (scr_status & SCI_CTRL_FLAGS_REIE))
713 ret = sci_er_interrupt(irq, ptr);
714 /* Break Interrupt */
715 if ((ssr_status & 0x0010) && (scr_status & SCI_CTRL_FLAGS_REIE))
716 ret = sci_br_interrupt(irq, ptr);
721 #ifdef CONFIG_HAVE_CLK
723 * Here we define a transistion notifier so that we can update all of our
724 * ports' baud rate when the peripheral clock changes.
726 static int sci_notifier(struct notifier_block *self,
727 unsigned long phase, void *p)
731 if ((phase == CPUFREQ_POSTCHANGE) ||
732 (phase == CPUFREQ_RESUMECHANGE))
733 for (i = 0; i < SCI_NPORTS; i++) {
734 struct sci_port *s = &sci_ports[i];
735 s->port.uartclk = clk_get_rate(s->clk);
741 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
744 static int sci_request_irq(struct sci_port *port)
747 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
748 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
751 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
752 "SCI Transmit Data Empty", "SCI Break" };
754 if (port->irqs[0] == port->irqs[1]) {
755 if (unlikely(!port->irqs[0]))
758 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
759 IRQF_DISABLED, "sci", port)) {
760 dev_err(port->port.dev, "Can't allocate IRQ\n");
764 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
765 if (unlikely(!port->irqs[i]))
768 if (request_irq(port->irqs[i], handlers[i],
769 IRQF_DISABLED, desc[i], port)) {
770 dev_err(port->port.dev, "Can't allocate IRQ\n");
779 static void sci_free_irq(struct sci_port *port)
783 if (port->irqs[0] == port->irqs[1])
784 free_irq(port->irqs[0], port);
786 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
790 free_irq(port->irqs[i], port);
795 static unsigned int sci_tx_empty(struct uart_port *port)
801 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
803 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
804 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
805 /* If you have signals for DTR and DCD, please implement here. */
808 static unsigned int sci_get_mctrl(struct uart_port *port)
810 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
813 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
816 static void sci_start_tx(struct uart_port *port)
820 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
821 ctrl = sci_in(port, SCSCR);
822 ctrl |= SCI_CTRL_FLAGS_TIE;
823 sci_out(port, SCSCR, ctrl);
826 static void sci_stop_tx(struct uart_port *port)
830 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
831 ctrl = sci_in(port, SCSCR);
832 ctrl &= ~SCI_CTRL_FLAGS_TIE;
833 sci_out(port, SCSCR, ctrl);
836 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
840 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
841 ctrl = sci_in(port, SCSCR);
842 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
843 sci_out(port, SCSCR, ctrl);
846 static void sci_stop_rx(struct uart_port *port)
850 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
851 ctrl = sci_in(port, SCSCR);
852 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
853 sci_out(port, SCSCR, ctrl);
856 static void sci_enable_ms(struct uart_port *port)
858 /* Nothing here yet .. */
861 static void sci_break_ctl(struct uart_port *port, int break_state)
863 /* Nothing here yet .. */
866 static int sci_startup(struct uart_port *port)
868 struct sci_port *s = &sci_ports[port->line];
873 #ifdef CONFIG_HAVE_CLK
874 s->clk = clk_get(NULL, "module_clk");
879 sci_start_rx(port, 1);
884 static void sci_shutdown(struct uart_port *port)
886 struct sci_port *s = &sci_ports[port->line];
895 #ifdef CONFIG_HAVE_CLK
901 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
902 struct ktermios *old)
904 unsigned int status, baud, smr_val;
907 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
909 t = SCBRR_VALUE(baud, port->uartclk);
912 status = sci_in(port, SCxSR);
913 } while (!(status & SCxSR_TEND(port)));
915 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
917 if (port->type != PORT_SCI)
918 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
920 smr_val = sci_in(port, SCSMR) & 3;
921 if ((termios->c_cflag & CSIZE) == CS7)
923 if (termios->c_cflag & PARENB)
925 if (termios->c_cflag & PARODD)
927 if (termios->c_cflag & CSTOPB)
930 uart_update_timeout(port, termios->c_cflag, baud);
932 sci_out(port, SCSMR, smr_val);
936 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
939 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
941 sci_out(port, SCBRR, t);
942 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
945 sci_init_pins(port, termios->c_cflag);
946 sci_out(port, SCFCR, (termios->c_cflag & CRTSCTS) ? SCFCR_MCE : 0);
948 sci_out(port, SCSCR, SCSCR_INIT(port));
950 if ((termios->c_cflag & CREAD) != 0)
951 sci_start_rx(port, 0);
954 static const char *sci_type(struct uart_port *port)
956 switch (port->type) {
970 static void sci_release_port(struct uart_port *port)
972 /* Nothing here yet .. */
975 static int sci_request_port(struct uart_port *port)
977 /* Nothing here yet .. */
981 static void sci_config_port(struct uart_port *port, int flags)
983 struct sci_port *s = &sci_ports[port->line];
985 port->type = s->type;
987 if (port->flags & UPF_IOREMAP && !port->membase) {
988 #if defined(CONFIG_SUPERH64)
989 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
990 port->membase = (void __iomem *)port->mapbase;
992 port->membase = ioremap_nocache(port->mapbase, 0x40);
995 dev_err(port->dev, "can't remap port#%d\n", port->line);
999 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1001 struct sci_port *s = &sci_ports[port->line];
1003 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
1005 if (ser->baud_base < 2400)
1006 /* No paper tape reader for Mitch.. */
1012 static struct uart_ops sci_uart_ops = {
1013 .tx_empty = sci_tx_empty,
1014 .set_mctrl = sci_set_mctrl,
1015 .get_mctrl = sci_get_mctrl,
1016 .start_tx = sci_start_tx,
1017 .stop_tx = sci_stop_tx,
1018 .stop_rx = sci_stop_rx,
1019 .enable_ms = sci_enable_ms,
1020 .break_ctl = sci_break_ctl,
1021 .startup = sci_startup,
1022 .shutdown = sci_shutdown,
1023 .set_termios = sci_set_termios,
1025 .release_port = sci_release_port,
1026 .request_port = sci_request_port,
1027 .config_port = sci_config_port,
1028 .verify_port = sci_verify_port,
1029 #ifdef CONFIG_CONSOLE_POLL
1030 .poll_get_char = sci_poll_get_char,
1031 .poll_put_char = sci_poll_put_char,
1035 static void __init sci_init_ports(void)
1037 static int first = 1;
1045 for (i = 0; i < SCI_NPORTS; i++) {
1046 sci_ports[i].port.ops = &sci_uart_ops;
1047 sci_ports[i].port.iotype = UPIO_MEM;
1048 sci_ports[i].port.line = i;
1049 sci_ports[i].port.fifosize = 1;
1051 #if defined(__H8300H__) || defined(__H8300S__)
1053 sci_ports[i].enable = h8300_sci_enable;
1054 sci_ports[i].disable = h8300_sci_disable;
1056 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1057 #elif defined(CONFIG_HAVE_CLK)
1059 * XXX: We should use a proper SCI/SCIF clock
1062 struct clk *clk = clk_get(NULL, "module_clk");
1063 sci_ports[i].port.uartclk = clk_get_rate(clk);
1067 #error "Need a valid uartclk"
1070 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1071 sci_ports[i].break_timer.function = sci_break_timer;
1073 init_timer(&sci_ports[i].break_timer);
1077 int __init early_sci_setup(struct uart_port *port)
1079 if (unlikely(port->line > SCI_NPORTS))
1084 sci_ports[port->line].port.membase = port->membase;
1085 sci_ports[port->line].port.mapbase = port->mapbase;
1086 sci_ports[port->line].port.type = port->type;
1091 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1093 * Print a string to the serial port trying not to disturb
1094 * any possible real use of the port...
1096 static void serial_console_write(struct console *co, const char *s,
1099 struct uart_port *port = &serial_console_port->port;
1100 unsigned short bits;
1103 for (i = 0; i < count; i++) {
1105 sci_poll_put_char(port, '\r');
1107 sci_poll_put_char(port, *s++);
1110 /* wait until fifo is empty and last bit has been transmitted */
1111 bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
1112 while ((sci_in(port, SCxSR) & bits) != bits)
1116 static int __init serial_console_setup(struct console *co, char *options)
1118 struct uart_port *port;
1126 * Check whether an invalid uart number has been specified, and
1127 * if so, search for the first available port that does have
1130 if (co->index >= SCI_NPORTS)
1133 serial_console_port = &sci_ports[co->index];
1134 port = &serial_console_port->port;
1137 * Also need to check port->type, we don't actually have any
1138 * UPIO_PORT ports, but uart_report_port() handily misreports
1139 * it anyways if we don't have a port available by the time this is
1144 if (!port->membase || !port->mapbase)
1147 port->type = serial_console_port->type;
1149 #ifdef CONFIG_HAVE_CLK
1150 if (!serial_console_port->clk)
1151 serial_console_port->clk = clk_get(NULL, "module_clk");
1154 if (port->flags & UPF_IOREMAP)
1155 sci_config_port(port, 0);
1157 if (serial_console_port->enable)
1158 serial_console_port->enable(port);
1161 uart_parse_options(options, &baud, &parity, &bits, &flow);
1163 ret = uart_set_options(port, co, baud, parity, bits, flow);
1164 #if defined(__H8300H__) || defined(__H8300S__)
1165 /* disable rx interrupt */
1172 static struct console serial_console = {
1174 .device = uart_console_device,
1175 .write = serial_console_write,
1176 .setup = serial_console_setup,
1177 .flags = CON_PRINTBUFFER,
1179 .data = &sci_uart_driver,
1182 static int __init sci_console_init(void)
1185 register_console(&serial_console);
1188 console_initcall(sci_console_init);
1189 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1191 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1192 #define SCI_CONSOLE (&serial_console)
1194 #define SCI_CONSOLE 0
1197 static char banner[] __initdata =
1198 KERN_INFO "SuperH SCI(F) driver initialized\n";
1200 static struct uart_driver sci_uart_driver = {
1201 .owner = THIS_MODULE,
1202 .driver_name = "sci",
1203 .dev_name = "ttySC",
1205 .minor = SCI_MINOR_START,
1207 .cons = SCI_CONSOLE,
1211 * Register a set of serial devices attached to a platform device. The
1212 * list is terminated with a zero flags entry, which means we expect
1213 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1214 * remapping (such as sh64) should also set UPF_IOREMAP.
1216 static int __devinit sci_probe(struct platform_device *dev)
1218 struct plat_sci_port *p = dev->dev.platform_data;
1219 int i, ret = -EINVAL;
1221 for (i = 0; p && p->flags != 0; p++, i++) {
1222 struct sci_port *sciport = &sci_ports[i];
1225 if (unlikely(i == SCI_NPORTS)) {
1226 dev_notice(&dev->dev, "Attempting to register port "
1227 "%d when only %d are available.\n",
1229 dev_notice(&dev->dev, "Consider bumping "
1230 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1234 sciport->port.mapbase = p->mapbase;
1236 if (p->mapbase && !p->membase) {
1237 if (p->flags & UPF_IOREMAP) {
1238 p->membase = ioremap_nocache(p->mapbase, 0x40);
1239 if (IS_ERR(p->membase)) {
1240 ret = PTR_ERR(p->membase);
1245 * For the simple (and majority of) cases
1246 * where we don't need to do any remapping,
1247 * just cast the cookie directly.
1249 p->membase = (void __iomem *)p->mapbase;
1253 sciport->port.membase = p->membase;
1255 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1256 sciport->port.flags = p->flags;
1257 sciport->port.dev = &dev->dev;
1259 sciport->type = sciport->port.type = p->type;
1261 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1263 uart_add_one_port(&sci_uart_driver, &sciport->port);
1266 #ifdef CONFIG_HAVE_CLK
1267 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1270 #ifdef CONFIG_SH_STANDARD_BIOS
1271 sh_bios_gdb_detach();
1277 for (i = i - 1; i >= 0; i--)
1278 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1283 static int __devexit sci_remove(struct platform_device *dev)
1287 #ifdef CONFIG_HAVE_CLK
1288 cpufreq_unregister_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1291 for (i = 0; i < SCI_NPORTS; i++)
1292 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1297 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1301 for (i = 0; i < SCI_NPORTS; i++) {
1302 struct sci_port *p = &sci_ports[i];
1304 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1305 uart_suspend_port(&sci_uart_driver, &p->port);
1311 static int sci_resume(struct platform_device *dev)
1315 for (i = 0; i < SCI_NPORTS; i++) {
1316 struct sci_port *p = &sci_ports[i];
1318 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1319 uart_resume_port(&sci_uart_driver, &p->port);
1325 static struct platform_driver sci_driver = {
1327 .remove = __devexit_p(sci_remove),
1328 .suspend = sci_suspend,
1329 .resume = sci_resume,
1332 .owner = THIS_MODULE,
1336 static int __init sci_init(void)
1344 ret = uart_register_driver(&sci_uart_driver);
1345 if (likely(ret == 0)) {
1346 ret = platform_driver_register(&sci_driver);
1348 uart_unregister_driver(&sci_uart_driver);
1354 static void __exit sci_exit(void)
1356 platform_driver_unregister(&sci_driver);
1357 uart_unregister_driver(&sci_uart_driver);
1360 module_init(sci_init);
1361 module_exit(sci_exit);
1363 MODULE_LICENSE("GPL");
1364 MODULE_ALIAS("platform:sh-sci");