2 * drivers/serial/sh-sci.c
4 * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
6 * Copyright (C) 2002 - 2006 Paul Mundt
8 * based off of the old drivers/char/sh-sci.c by:
10 * Copyright (C) 1999, 2000 Niibe Yutaka
11 * Copyright (C) 2000 Sugioka Toshinobu
12 * Modified to support multiple serial ports. Stuart Menefy (May 2000).
13 * Modified to support SecureEdge. David McCullough (2002)
14 * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file "COPYING" in the main directory of this archive
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/timer.h>
26 #include <linux/interrupt.h>
27 #include <linux/tty.h>
28 #include <linux/tty_flip.h>
29 #include <linux/serial.h>
30 #include <linux/major.h>
31 #include <linux/string.h>
32 #include <linux/sysrq.h>
33 #include <linux/ioport.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/console.h>
38 #include <linux/platform_device.h>
40 #ifdef CONFIG_CPU_FREQ
41 #include <linux/notifier.h>
42 #include <linux/cpufreq.h>
45 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
46 #include <asm/clock.h>
47 #include <asm/sh_bios.h>
53 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
60 struct uart_port port;
65 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
66 unsigned int irqs[SCIx_NR_IRQS];
68 /* Port pin configuration */
69 void (*init_pins)(struct uart_port *port,
72 /* Port enable callback */
73 void (*enable)(struct uart_port *port);
75 /* Port disable callback */
76 void (*disable)(struct uart_port *port);
79 struct timer_list break_timer;
84 static struct sci_port *kgdb_sci_port;
87 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
88 static struct sci_port *serial_console_port;
91 /* Function prototypes */
92 static void sci_stop_tx(struct uart_port *port);
94 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
96 static struct sci_port sci_ports[SCI_NPORTS];
97 static struct uart_driver sci_uart_driver;
99 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \
100 defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
101 static inline void handle_error(struct uart_port *port)
103 /* Clear error flags */
104 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
107 static int get_char(struct uart_port *port)
110 unsigned short status;
113 spin_lock_irqsave(&port->lock, flags);
115 status = sci_in(port, SCxSR);
116 if (status & SCxSR_ERRORS(port)) {
120 } while (!(status & SCxSR_RDxF(port)));
121 c = sci_in(port, SCxRDR);
122 sci_in(port, SCxSR); /* Dummy read */
123 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
124 spin_unlock_irqrestore(&port->lock, flags);
128 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
130 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB)
131 static void put_char(struct uart_port *port, char c)
134 unsigned short status;
136 spin_lock_irqsave(&port->lock, flags);
139 status = sci_in(port, SCxSR);
140 } while (!(status & SCxSR_TDxE(port)));
142 sci_out(port, SCxTDR, c);
143 sci_in(port, SCxSR); /* Dummy read */
144 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
146 spin_unlock_irqrestore(&port->lock, flags);
150 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
151 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
153 struct uart_port *port = &sci_port->port;
154 const unsigned char *p = buffer;
157 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
161 #ifdef CONFIG_SH_STANDARD_BIOS
162 /* This call only does a trap the first time it is
163 * called, and so is safe to do here unconditionally
165 usegdb |= sh_bios_in_gdb_mode();
167 #ifdef CONFIG_SH_KGDB
168 usegdb |= (kgdb_in_gdb_mode && (port == kgdb_sci_port));
172 /* $<packet info>#<checksum>. */
176 put_char(port, 'O'); /* 'O'utput to console */
179 for (i=0; i<count; i++) { /* Don't use run length encoding */
190 put_char(port, highhex(checksum));
191 put_char(port, lowhex(checksum));
192 } while (get_char(port) != '+');
194 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
195 for (i=0; i<count; i++) {
197 put_char(port, '\r');
198 put_char(port, *p++);
201 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
203 #ifdef CONFIG_SH_KGDB
204 static int kgdb_sci_getchar(void)
208 /* Keep trying to read a character, this could be neater */
209 while ((c = get_char(kgdb_sci_port)) < 0)
215 static inline void kgdb_sci_putchar(int c)
217 put_char(kgdb_sci_port, c);
219 #endif /* CONFIG_SH_KGDB */
221 #if defined(__H8300S__)
222 enum { sci_disable, sci_enable };
224 static void h8300_sci_config(struct uart_port* port, unsigned int ctrl)
226 volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
227 int ch = (port->mapbase - SMR0) >> 3;
228 unsigned char mask = 1 << (ch+1);
230 if (ctrl == sci_disable) {
237 static inline void h8300_sci_enable(struct uart_port *port)
239 h8300_sci_config(port, sci_enable);
242 static inline void h8300_sci_disable(struct uart_port *port)
244 h8300_sci_config(port, sci_disable);
248 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \
249 defined(__H8300H__) || defined(__H8300S__)
250 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
252 int ch = (port->mapbase - SMR0) >> 3;
255 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
256 h8300_sci_pins[ch].rx,
258 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
259 h8300_sci_pins[ch].tx,
263 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
266 #define sci_init_pins_sci NULL
269 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
270 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
272 unsigned int fcr_val = 0;
275 fcr_val |= SCFCR_MCE;
277 sci_out(port, SCFCR, fcr_val);
280 #define sci_init_pins_irda NULL
284 #define sci_init_pins_scif NULL
287 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
288 #if defined(CONFIG_CPU_SUBTYPE_SH7300) || defined(CONFIG_CPU_SUBTYPE_SH7710)
289 /* SH7300 doesn't use RTS/CTS */
290 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
292 sci_out(port, SCFCR, 0);
294 #elif defined(CONFIG_CPU_SH3)
295 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
296 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
298 unsigned int fcr_val = 0;
301 /* We need to set SCPCR to enable RTS/CTS */
302 data = ctrl_inw(SCPCR);
303 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
304 ctrl_outw(data & 0x0fcf, SCPCR);
307 fcr_val |= SCFCR_MCE;
309 /* We need to set SCPCR to enable RTS/CTS */
310 data = ctrl_inw(SCPCR);
311 /* Clear out SCP7MD1,0, SCP4MD1,0,
312 Set SCP6MD1,0 = {01} (output) */
313 ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR);
315 data = ctrl_inb(SCPDR);
316 /* Set /RTS2 (bit6) = 0 */
317 ctrl_outb(data & 0xbf, SCPDR);
320 sci_out(port, SCFCR, fcr_val);
324 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
326 unsigned int fcr_val = 0;
328 if (cflag & CRTSCTS) {
329 fcr_val |= SCFCR_MCE;
331 #ifdef CONFIG_CPU_SUBTYPE_SH7343
333 #elif defined(CONFIG_CPU_SUBTYPE_SH7780)
334 ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */
336 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
339 sci_out(port, SCFCR, fcr_val);
343 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || defined(CONFIG_CPU_SUBTYPE_SH7780)
344 static inline int scif_txroom(struct uart_port *port)
346 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0x7f);
349 static inline int scif_rxroom(struct uart_port *port)
351 return sci_in(port, SCRFDR) & 0x7f;
354 static inline int scif_txroom(struct uart_port *port)
356 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
359 static inline int scif_rxroom(struct uart_port *port)
361 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
364 #endif /* SCIF_ONLY || SCI_AND_SCIF */
366 static inline int sci_txroom(struct uart_port *port)
368 return ((sci_in(port, SCxSR) & SCI_TDRE) != 0);
371 static inline int sci_rxroom(struct uart_port *port)
373 return ((sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0);
376 /* ********************************************************************** *
377 * the interrupt related routines *
378 * ********************************************************************** */
380 static void sci_transmit_chars(struct uart_port *port)
382 struct circ_buf *xmit = &port->info->xmit;
383 unsigned int stopped = uart_tx_stopped(port);
384 unsigned short status;
388 status = sci_in(port, SCxSR);
389 if (!(status & SCxSR_TDxE(port))) {
390 ctrl = sci_in(port, SCSCR);
391 if (uart_circ_empty(xmit)) {
392 ctrl &= ~SCI_CTRL_FLAGS_TIE;
394 ctrl |= SCI_CTRL_FLAGS_TIE;
396 sci_out(port, SCSCR, ctrl);
401 if (port->type == PORT_SCIF)
402 count = scif_txroom(port);
405 count = sci_txroom(port);
413 } else if (!uart_circ_empty(xmit) && !stopped) {
414 c = xmit->buf[xmit->tail];
415 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
420 sci_out(port, SCxTDR, c);
423 } while (--count > 0);
425 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
427 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
428 uart_write_wakeup(port);
429 if (uart_circ_empty(xmit)) {
432 ctrl = sci_in(port, SCSCR);
434 #if !defined(SCI_ONLY)
435 if (port->type == PORT_SCIF) {
436 sci_in(port, SCxSR); /* Dummy read */
437 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
441 ctrl |= SCI_CTRL_FLAGS_TIE;
442 sci_out(port, SCSCR, ctrl);
446 /* On SH3, SCIF may read end-of-break as a space->mark char */
447 #define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
449 static inline void sci_receive_chars(struct uart_port *port)
451 struct sci_port *sci_port = (struct sci_port *)port;
452 struct tty_struct *tty = port->info->tty;
453 int i, count, copied = 0;
454 unsigned short status;
457 status = sci_in(port, SCxSR);
458 if (!(status & SCxSR_RDxF(port)))
462 #if !defined(SCI_ONLY)
463 if (port->type == PORT_SCIF)
464 count = scif_rxroom(port);
467 count = sci_rxroom(port);
469 /* Don't copy more bytes than there is room for in the buffer */
470 count = tty_buffer_request_room(tty, count);
472 /* If for any reason we can't copy more data, we're done! */
476 if (port->type == PORT_SCI) {
477 char c = sci_in(port, SCxRDR);
478 if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
481 tty_insert_flip_char(tty, c, TTY_NORMAL);
484 for (i=0; i<count; i++) {
485 char c = sci_in(port, SCxRDR);
486 status = sci_in(port, SCxSR);
487 #if defined(CONFIG_CPU_SH3)
488 /* Skip "chars" during break */
489 if (sci_port->break_flag) {
491 (status & SCxSR_FER(port))) {
496 /* Nonzero => end-of-break */
497 pr_debug("scif: debounce<%02x>\n", c);
498 sci_port->break_flag = 0;
505 #endif /* CONFIG_CPU_SH3 */
506 if (uart_handle_sysrq_char(port, c)) {
511 /* Store data and status */
512 if (status&SCxSR_FER(port)) {
514 pr_debug("sci: frame error\n");
515 } else if (status&SCxSR_PER(port)) {
517 pr_debug("sci: parity error\n");
520 tty_insert_flip_char(tty, c, flag);
524 sci_in(port, SCxSR); /* dummy read */
525 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
528 port->icount.rx += count;
532 /* Tell the rest of the system the news. New characters! */
533 tty_flip_buffer_push(tty);
535 sci_in(port, SCxSR); /* dummy read */
536 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
540 #define SCI_BREAK_JIFFIES (HZ/20)
541 /* The sci generates interrupts during the break,
542 * 1 per millisecond or so during the break period, for 9600 baud.
543 * So dont bother disabling interrupts.
544 * But dont want more than 1 break event.
545 * Use a kernel timer to periodically poll the rx line until
546 * the break is finished.
548 static void sci_schedule_break_timer(struct sci_port *port)
550 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
551 add_timer(&port->break_timer);
553 /* Ensure that two consecutive samples find the break over. */
554 static void sci_break_timer(unsigned long data)
556 struct sci_port *port = (struct sci_port *)data;
558 if (sci_rxd_in(&port->port) == 0) {
559 port->break_flag = 1;
560 sci_schedule_break_timer(port);
561 } else if (port->break_flag == 1) {
563 port->break_flag = 2;
564 sci_schedule_break_timer(port);
566 port->break_flag = 0;
569 static inline int sci_handle_errors(struct uart_port *port)
572 unsigned short status = sci_in(port, SCxSR);
573 struct tty_struct *tty = port->info->tty;
575 if (status & SCxSR_ORER(port)) {
577 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
579 pr_debug("sci: overrun error\n");
582 if (status & SCxSR_FER(port)) {
583 if (sci_rxd_in(port) == 0) {
584 /* Notify of BREAK */
585 struct sci_port *sci_port = (struct sci_port *)port;
587 if (!sci_port->break_flag) {
588 sci_port->break_flag = 1;
589 sci_schedule_break_timer(sci_port);
591 /* Do sysrq handling. */
592 if (uart_handle_break(port))
594 pr_debug("sci: BREAK detected\n");
595 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
600 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
602 pr_debug("sci: frame error\n");
606 if (status & SCxSR_PER(port)) {
608 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
610 pr_debug("sci: parity error\n");
614 tty_flip_buffer_push(tty);
619 static inline int sci_handle_breaks(struct uart_port *port)
622 unsigned short status = sci_in(port, SCxSR);
623 struct tty_struct *tty = port->info->tty;
624 struct sci_port *s = &sci_ports[port->line];
626 if (!s->break_flag && status & SCxSR_BRK(port)) {
627 #if defined(CONFIG_CPU_SH3)
631 /* Notify of BREAK */
632 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
634 pr_debug("sci: BREAK detected\n");
637 #if defined(SCIF_ORER)
638 /* XXX: Handle SCIF overrun error */
639 if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
640 sci_out(port, SCLSR, 0);
641 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
643 pr_debug("sci: overrun error\n");
649 tty_flip_buffer_push(tty);
654 static irqreturn_t sci_rx_interrupt(int irq, void *port)
656 /* I think sci_receive_chars has to be called irrespective
657 * of whether the I_IXOFF is set, otherwise, how is the interrupt
660 sci_receive_chars(port);
665 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
667 struct uart_port *port = ptr;
669 spin_lock_irq(&port->lock);
670 sci_transmit_chars(port);
671 spin_unlock_irq(&port->lock);
676 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
678 struct uart_port *port = ptr;
681 if (port->type == PORT_SCI) {
682 if (sci_handle_errors(port)) {
683 /* discard character in rx buffer */
685 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
688 #if defined(SCIF_ORER)
689 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
690 struct tty_struct *tty = port->info->tty;
692 sci_out(port, SCLSR, 0);
693 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
694 tty_flip_buffer_push(tty);
695 pr_debug("scif: overrun error\n");
698 sci_rx_interrupt(irq, ptr);
701 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
703 /* Kick the transmission */
704 sci_tx_interrupt(irq, ptr);
709 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
711 struct uart_port *port = ptr;
714 sci_handle_breaks(port);
716 #ifdef CONFIG_SH_KGDB
717 /* Break into the debugger if a break is detected */
721 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
726 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
728 unsigned short ssr_status, scr_status;
729 struct uart_port *port = ptr;
731 ssr_status = sci_in(port,SCxSR);
732 scr_status = sci_in(port,SCSCR);
735 if ((ssr_status & 0x0020) && (scr_status & 0x0080))
736 sci_tx_interrupt(irq, ptr);
738 if ((ssr_status & 0x0002) && (scr_status & 0x0040))
739 sci_rx_interrupt(irq, ptr);
740 /* Error Interrupt */
741 if ((ssr_status & 0x0080) && (scr_status & 0x0400))
742 sci_er_interrupt(irq, ptr);
743 /* Break Interrupt */
744 if ((ssr_status & 0x0010) && (scr_status & 0x0200))
745 sci_br_interrupt(irq, ptr);
750 #ifdef CONFIG_CPU_FREQ
752 * Here we define a transistion notifier so that we can update all of our
753 * ports' baud rate when the peripheral clock changes.
755 static int sci_notifier(struct notifier_block *self,
756 unsigned long phase, void *p)
758 struct cpufreq_freqs *freqs = p;
761 if ((phase == CPUFREQ_POSTCHANGE) ||
762 (phase == CPUFREQ_RESUMECHANGE)){
763 for (i = 0; i < SCI_NPORTS; i++) {
764 struct uart_port *port = &sci_ports[i].port;
768 * Update the uartclk per-port if frequency has
769 * changed, since it will no longer necessarily be
770 * consistent with the old frequency.
772 * Really we want to be able to do something like
773 * uart_change_speed() or something along those lines
774 * here to implicitly reset the per-port baud rate..
776 * Clean this up later..
778 clk = clk_get("module_clk");
779 port->uartclk = clk_get_rate(clk) * 16;
783 printk(KERN_INFO "%s: got a postchange notification "
784 "for cpu %d (old %d, new %d)\n",
785 __FUNCTION__, freqs->cpu, freqs->old, freqs->new);
791 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
792 #endif /* CONFIG_CPU_FREQ */
794 static int sci_request_irq(struct sci_port *port)
797 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
798 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
801 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
802 "SCI Transmit Data Empty", "SCI Break" };
804 if (port->irqs[0] == port->irqs[1]) {
805 if (!port->irqs[0]) {
806 printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
810 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
811 SA_INTERRUPT, "sci", port)) {
812 printk(KERN_ERR "sci: Cannot allocate irq.\n");
816 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
819 if (request_irq(port->irqs[i], handlers[i],
820 SA_INTERRUPT, desc[i], port)) {
821 printk(KERN_ERR "sci: Cannot allocate irq.\n");
830 static void sci_free_irq(struct sci_port *port)
834 if (port->irqs[0] == port->irqs[1]) {
836 printk("sci: sci_free_irq error\n");
838 free_irq(port->irqs[0], port);
840 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
844 free_irq(port->irqs[i], port);
849 static unsigned int sci_tx_empty(struct uart_port *port)
855 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
857 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
858 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
859 /* If you have signals for DTR and DCD, please implement here. */
862 static unsigned int sci_get_mctrl(struct uart_port *port)
864 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
867 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
870 static void sci_start_tx(struct uart_port *port)
874 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
875 ctrl = sci_in(port, SCSCR);
876 ctrl |= SCI_CTRL_FLAGS_TIE;
877 sci_out(port, SCSCR, ctrl);
880 static void sci_stop_tx(struct uart_port *port)
884 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
885 ctrl = sci_in(port, SCSCR);
886 ctrl &= ~SCI_CTRL_FLAGS_TIE;
887 sci_out(port, SCSCR, ctrl);
890 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
894 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
895 ctrl = sci_in(port, SCSCR);
896 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
897 sci_out(port, SCSCR, ctrl);
900 static void sci_stop_rx(struct uart_port *port)
904 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
905 ctrl = sci_in(port, SCSCR);
906 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
907 sci_out(port, SCSCR, ctrl);
910 static void sci_enable_ms(struct uart_port *port)
912 /* Nothing here yet .. */
915 static void sci_break_ctl(struct uart_port *port, int break_state)
917 /* Nothing here yet .. */
920 static int sci_startup(struct uart_port *port)
922 struct sci_port *s = &sci_ports[port->line];
929 sci_start_rx(port, 1);
934 static void sci_shutdown(struct uart_port *port)
936 struct sci_port *s = &sci_ports[port->line];
946 static void sci_set_termios(struct uart_port *port, struct termios *termios,
949 struct sci_port *s = &sci_ports[port->line];
950 unsigned int status, baud, smr_val;
954 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
962 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
963 struct clk *clk = clk_get("module_clk");
964 t = SCBRR_VALUE(baud, clk_get_rate(clk));
967 t = SCBRR_VALUE(baud);
973 spin_lock_irqsave(&port->lock, flags);
976 status = sci_in(port, SCxSR);
977 } while (!(status & SCxSR_TEND(port)));
979 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
981 #if !defined(SCI_ONLY)
982 if (port->type == PORT_SCIF)
983 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
986 smr_val = sci_in(port, SCSMR) & 3;
987 if ((termios->c_cflag & CSIZE) == CS7)
989 if (termios->c_cflag & PARENB)
991 if (termios->c_cflag & PARODD)
993 if (termios->c_cflag & CSTOPB)
996 uart_update_timeout(port, termios->c_cflag, baud);
998 sci_out(port, SCSMR, smr_val);
1002 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1005 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1007 sci_out(port, SCBRR, t);
1008 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1011 if (likely(s->init_pins))
1012 s->init_pins(port, termios->c_cflag);
1014 sci_out(port, SCSCR, SCSCR_INIT(port));
1016 if ((termios->c_cflag & CREAD) != 0)
1017 sci_start_rx(port,0);
1019 spin_unlock_irqrestore(&port->lock, flags);
1022 static const char *sci_type(struct uart_port *port)
1024 switch (port->type) {
1025 case PORT_SCI: return "sci";
1026 case PORT_SCIF: return "scif";
1027 case PORT_IRDA: return "irda";
1033 static void sci_release_port(struct uart_port *port)
1035 /* Nothing here yet .. */
1038 static int sci_request_port(struct uart_port *port)
1040 /* Nothing here yet .. */
1044 static void sci_config_port(struct uart_port *port, int flags)
1046 struct sci_port *s = &sci_ports[port->line];
1048 port->type = s->type;
1050 switch (port->type) {
1052 s->init_pins = sci_init_pins_sci;
1055 s->init_pins = sci_init_pins_scif;
1058 s->init_pins = sci_init_pins_irda;
1062 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1063 if (port->mapbase == 0)
1064 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1066 port->membase = (void __iomem *)port->mapbase;
1070 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1072 struct sci_port *s = &sci_ports[port->line];
1074 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1076 if (ser->baud_base < 2400)
1077 /* No paper tape reader for Mitch.. */
1083 static struct uart_ops sci_uart_ops = {
1084 .tx_empty = sci_tx_empty,
1085 .set_mctrl = sci_set_mctrl,
1086 .get_mctrl = sci_get_mctrl,
1087 .start_tx = sci_start_tx,
1088 .stop_tx = sci_stop_tx,
1089 .stop_rx = sci_stop_rx,
1090 .enable_ms = sci_enable_ms,
1091 .break_ctl = sci_break_ctl,
1092 .startup = sci_startup,
1093 .shutdown = sci_shutdown,
1094 .set_termios = sci_set_termios,
1096 .release_port = sci_release_port,
1097 .request_port = sci_request_port,
1098 .config_port = sci_config_port,
1099 .verify_port = sci_verify_port,
1102 static void __init sci_init_ports(void)
1104 static int first = 1;
1112 for (i = 0; i < SCI_NPORTS; i++) {
1113 sci_ports[i].port.ops = &sci_uart_ops;
1114 sci_ports[i].port.iotype = UPIO_MEM;
1115 sci_ports[i].port.line = i;
1116 sci_ports[i].port.fifosize = 1;
1118 #if defined(__H8300H__) || defined(__H8300S__)
1120 sci_ports[i].enable = h8300_sci_enable;
1121 sci_ports[i].disable = h8300_sci_disable;
1123 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1124 #elif defined(CONFIG_SUPERH64)
1125 sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16;
1128 * XXX: We should use a proper SCI/SCIF clock
1131 struct clk *clk = clk_get("module_clk");
1132 sci_ports[i].port.uartclk = clk_get_rate(clk) * 16;
1137 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1138 sci_ports[i].break_timer.function = sci_break_timer;
1140 init_timer(&sci_ports[i].break_timer);
1144 int __init early_sci_setup(struct uart_port *port)
1146 if (unlikely(port->line > SCI_NPORTS))
1151 sci_ports[port->line].port.membase = port->membase;
1152 sci_ports[port->line].port.mapbase = port->mapbase;
1153 sci_ports[port->line].port.type = port->type;
1158 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1160 * Print a string to the serial port trying not to disturb
1161 * any possible real use of the port...
1163 static void serial_console_write(struct console *co, const char *s,
1166 put_string(serial_console_port, s, count);
1169 static int __init serial_console_setup(struct console *co, char *options)
1171 struct uart_port *port;
1179 * Check whether an invalid uart number has been specified, and
1180 * if so, search for the first available port that does have
1183 if (co->index >= SCI_NPORTS)
1186 serial_console_port = &sci_ports[co->index];
1187 port = &serial_console_port->port;
1190 * Also need to check port->type, we don't actually have any
1191 * UPIO_PORT ports, but uart_report_port() handily misreports
1192 * it anyways if we don't have a port available by the time this is
1197 if (!port->membase || !port->mapbase)
1200 spin_lock_init(&port->lock);
1202 port->type = serial_console_port->type;
1204 if (port->flags & UPF_IOREMAP)
1205 sci_config_port(port, 0);
1207 if (serial_console_port->enable)
1208 serial_console_port->enable(port);
1211 uart_parse_options(options, &baud, &parity, &bits, &flow);
1213 ret = uart_set_options(port, co, baud, parity, bits, flow);
1214 #if defined(__H8300H__) || defined(__H8300S__)
1215 /* disable rx interrupt */
1222 static struct console serial_console = {
1224 .device = uart_console_device,
1225 .write = serial_console_write,
1226 .setup = serial_console_setup,
1227 .flags = CON_PRINTBUFFER,
1229 .data = &sci_uart_driver,
1232 static int __init sci_console_init(void)
1235 register_console(&serial_console);
1238 console_initcall(sci_console_init);
1239 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1241 #ifdef CONFIG_SH_KGDB
1243 * FIXME: Most of this can go away.. at the moment, we rely on
1244 * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1245 * most of that can easily be done here instead.
1247 * For the time being, just accept the values that were parsed earlier..
1249 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1250 int *parity, int *bits)
1253 *parity = tolower(kgdb_parity);
1254 *bits = kgdb_bits - '0';
1258 * The naming here is somewhat misleading, since kgdb_console_setup() takes
1259 * care of the early-on initialization for kgdb, regardless of whether we
1260 * actually use kgdb as a console or not.
1262 * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1264 int __init kgdb_console_setup(struct console *co, char *options)
1266 struct uart_port *port = &sci_ports[kgdb_portnum].port;
1272 spin_lock_init(&port->lock);
1274 if (co->index != kgdb_portnum)
1275 co->index = kgdb_portnum;
1278 uart_parse_options(options, &baud, &parity, &bits, &flow);
1280 kgdb_console_get_options(port, &baud, &parity, &bits);
1282 kgdb_getchar = kgdb_sci_getchar;
1283 kgdb_putchar = kgdb_sci_putchar;
1285 return uart_set_options(port, co, baud, parity, bits, flow);
1287 #endif /* CONFIG_SH_KGDB */
1289 #ifdef CONFIG_SH_KGDB_CONSOLE
1290 static struct console kgdb_console = {
1292 .write = kgdb_console_write,
1293 .setup = kgdb_console_setup,
1294 .flags = CON_PRINTBUFFER | CON_ENABLED,
1296 .data = &sci_uart_driver,
1299 /* Register the KGDB console so we get messages (d'oh!) */
1300 static int __init kgdb_console_init(void)
1303 register_console(&kgdb_console);
1306 console_initcall(kgdb_console_init);
1307 #endif /* CONFIG_SH_KGDB_CONSOLE */
1309 #if defined(CONFIG_SH_KGDB_CONSOLE)
1310 #define SCI_CONSOLE &kgdb_console
1311 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1312 #define SCI_CONSOLE &serial_console
1314 #define SCI_CONSOLE 0
1317 static char banner[] __initdata =
1318 KERN_INFO "SuperH SCI(F) driver initialized\n";
1320 static struct uart_driver sci_uart_driver = {
1321 .owner = THIS_MODULE,
1322 .driver_name = "sci",
1323 .dev_name = "ttySC",
1325 .minor = SCI_MINOR_START,
1327 .cons = SCI_CONSOLE,
1331 * Register a set of serial devices attached to a platform device. The
1332 * list is terminated with a zero flags entry, which means we expect
1333 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1334 * remapping (such as sh64) should also set UPF_IOREMAP.
1336 static int __devinit sci_probe(struct platform_device *dev)
1338 struct plat_sci_port *p = dev->dev.platform_data;
1341 for (i = 0; p && p->flags != 0 && i < SCI_NPORTS; p++, i++) {
1342 struct sci_port *sciport = &sci_ports[i];
1344 sciport->port.mapbase = p->mapbase;
1347 * For the simple (and majority of) cases where we don't need
1348 * to do any remapping, just cast the cookie directly.
1350 if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP))
1351 p->membase = (void __iomem *)p->mapbase;
1353 sciport->port.membase = p->membase;
1355 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1356 sciport->port.flags = p->flags;
1357 sciport->port.dev = &dev->dev;
1359 sciport->type = sciport->port.type = p->type;
1361 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1363 uart_add_one_port(&sci_uart_driver, &sciport->port);
1366 #ifdef CONFIG_CPU_FREQ
1367 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1368 dev_info(&dev->dev, "sci: CPU frequency notifier registered\n");
1371 #ifdef CONFIG_SH_STANDARD_BIOS
1372 sh_bios_gdb_detach();
1378 static int __devexit sci_remove(struct platform_device *dev)
1382 for (i = 0; i < SCI_NPORTS; i++)
1383 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1388 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1392 for (i = 0; i < SCI_NPORTS; i++) {
1393 struct sci_port *p = &sci_ports[i];
1395 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1396 uart_suspend_port(&sci_uart_driver, &p->port);
1402 static int sci_resume(struct platform_device *dev)
1406 for (i = 0; i < SCI_NPORTS; i++) {
1407 struct sci_port *p = &sci_ports[i];
1409 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1410 uart_resume_port(&sci_uart_driver, &p->port);
1416 static struct platform_driver sci_driver = {
1418 .remove = __devexit_p(sci_remove),
1419 .suspend = sci_suspend,
1420 .resume = sci_resume,
1423 .owner = THIS_MODULE,
1427 static int __init sci_init(void)
1435 ret = uart_register_driver(&sci_uart_driver);
1436 if (likely(ret == 0)) {
1437 ret = platform_driver_register(&sci_driver);
1439 uart_unregister_driver(&sci_uart_driver);
1445 static void __exit sci_exit(void)
1447 platform_driver_unregister(&sci_driver);
1448 uart_unregister_driver(&sci_uart_driver);
1451 module_init(sci_init);
1452 module_exit(sci_exit);
1454 MODULE_LICENSE("GPL");