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
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>
45 #ifdef CONFIG_CPU_FREQ
46 #include <linux/notifier.h>
47 #include <linux/cpufreq.h>
50 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
51 #include <linux/ctype.h>
52 #include <asm/clock.h>
53 #include <asm/sh_bios.h>
61 struct uart_port port;
66 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
67 unsigned int irqs[SCIx_NR_IRQS];
69 /* Port pin configuration */
70 void (*init_pins)(struct uart_port *port,
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;
83 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
90 static struct sci_port *kgdb_sci_port;
93 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
94 static struct sci_port *serial_console_port;
97 /* Function prototypes */
98 static void sci_stop_tx(struct uart_port *port);
100 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
102 static struct sci_port sci_ports[SCI_NPORTS];
103 static struct uart_driver sci_uart_driver;
105 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \
106 defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
107 static inline void handle_error(struct uart_port *port)
109 /* Clear error flags */
110 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
113 static int get_char(struct uart_port *port)
116 unsigned short status;
119 spin_lock_irqsave(&port->lock, flags);
121 status = sci_in(port, SCxSR);
122 if (status & SCxSR_ERRORS(port)) {
126 } while (!(status & SCxSR_RDxF(port)));
127 c = sci_in(port, SCxRDR);
128 sci_in(port, SCxSR); /* Dummy read */
129 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
130 spin_unlock_irqrestore(&port->lock, flags);
134 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
136 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB)
137 static void put_char(struct uart_port *port, char c)
140 unsigned short status;
142 spin_lock_irqsave(&port->lock, flags);
145 status = sci_in(port, SCxSR);
146 } while (!(status & SCxSR_TDxE(port)));
148 sci_out(port, SCxTDR, c);
149 sci_in(port, SCxSR); /* Dummy read */
150 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
152 spin_unlock_irqrestore(&port->lock, flags);
156 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
157 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
159 struct uart_port *port = &sci_port->port;
160 const unsigned char *p = buffer;
163 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
167 #ifdef CONFIG_SH_STANDARD_BIOS
168 /* This call only does a trap the first time it is
169 * called, and so is safe to do here unconditionally
171 usegdb |= sh_bios_in_gdb_mode();
173 #ifdef CONFIG_SH_KGDB
174 usegdb |= (kgdb_in_gdb_mode && (sci_port == kgdb_sci_port));
178 /* $<packet info>#<checksum>. */
182 put_char(port, 'O'); /* 'O'utput to console */
185 for (i=0; i<count; i++) { /* Don't use run length encoding */
196 put_char(port, highhex(checksum));
197 put_char(port, lowhex(checksum));
198 } while (get_char(port) != '+');
200 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
201 for (i=0; i<count; i++) {
203 put_char(port, '\r');
204 put_char(port, *p++);
207 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
209 #ifdef CONFIG_SH_KGDB
210 static int kgdb_sci_getchar(void)
214 /* Keep trying to read a character, this could be neater */
215 while ((c = get_char(&kgdb_sci_port->port)) < 0)
221 static inline void kgdb_sci_putchar(int c)
223 put_char(&kgdb_sci_port->port, c);
225 #endif /* CONFIG_SH_KGDB */
227 #if defined(__H8300S__)
228 enum { sci_disable, sci_enable };
230 static void h8300_sci_config(struct uart_port* port, unsigned int ctrl)
232 volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
233 int ch = (port->mapbase - SMR0) >> 3;
234 unsigned char mask = 1 << (ch+1);
236 if (ctrl == sci_disable) {
243 static inline void h8300_sci_enable(struct uart_port *port)
245 h8300_sci_config(port, sci_enable);
248 static inline void h8300_sci_disable(struct uart_port *port)
250 h8300_sci_config(port, sci_disable);
254 #if defined(SCI_ONLY) || defined(SCI_AND_SCIF) && \
255 defined(__H8300H__) || defined(__H8300S__)
256 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
258 int ch = (port->mapbase - SMR0) >> 3;
261 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
262 h8300_sci_pins[ch].rx,
264 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
265 h8300_sci_pins[ch].tx,
269 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
272 #define sci_init_pins_sci NULL
275 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
276 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
278 unsigned int fcr_val = 0;
281 fcr_val |= SCFCR_MCE;
283 sci_out(port, SCFCR, fcr_val);
286 #define sci_init_pins_irda NULL
290 #define sci_init_pins_scif NULL
293 #if defined(SCIF_ONLY) || defined(SCI_AND_SCIF)
294 #if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
295 static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag)
297 unsigned int fcr_val = 0;
299 set_sh771x_scif_pfc(port);
300 if (cflag & CRTSCTS) {
301 fcr_val |= SCFCR_MCE;
303 sci_out(port, SCFCR, fcr_val);
305 #elif defined(CONFIG_CPU_SUBTYPE_SH7720)
306 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
308 unsigned int fcr_val = 0;
311 if (cflag & CRTSCTS) {
313 if (port->mapbase == 0xa4430000) { /* SCIF0 */
314 /* Clear PTCR bit 9-2; enable all scif pins but sck */
315 data = ctrl_inw(PORT_PTCR);
316 ctrl_outw((data & 0xfc03), PORT_PTCR);
317 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
318 /* Clear PVCR bit 9-2 */
319 data = ctrl_inw(PORT_PVCR);
320 ctrl_outw((data & 0xfc03), PORT_PVCR);
322 fcr_val |= SCFCR_MCE;
324 if (port->mapbase == 0xa4430000) { /* SCIF0 */
325 /* Clear PTCR bit 5-2; enable only tx and rx */
326 data = ctrl_inw(PORT_PTCR);
327 ctrl_outw((data & 0xffc3), PORT_PTCR);
328 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
329 /* Clear PVCR bit 5-2 */
330 data = ctrl_inw(PORT_PVCR);
331 ctrl_outw((data & 0xffc3), PORT_PVCR);
334 sci_out(port, SCFCR, fcr_val);
337 #elif defined(CONFIG_CPU_SH3)
338 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
339 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
341 unsigned int fcr_val = 0;
344 /* We need to set SCPCR to enable RTS/CTS */
345 data = ctrl_inw(SCPCR);
346 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
347 ctrl_outw(data & 0x0fcf, SCPCR);
350 fcr_val |= SCFCR_MCE;
352 /* We need to set SCPCR to enable RTS/CTS */
353 data = ctrl_inw(SCPCR);
354 /* Clear out SCP7MD1,0, SCP4MD1,0,
355 Set SCP6MD1,0 = {01} (output) */
356 ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR);
358 data = ctrl_inb(SCPDR);
359 /* Set /RTS2 (bit6) = 0 */
360 ctrl_outb(data & 0xbf, SCPDR);
363 sci_out(port, SCFCR, fcr_val);
365 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
366 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
368 unsigned int fcr_val = 0;
370 if (cflag & CRTSCTS) {
371 fcr_val |= SCFCR_MCE;
373 ctrl_outw(0x0000, PORT_PSCR);
377 data = ctrl_inw(PORT_PSCR);
380 ctrl_outw(data, PORT_PSCR);
382 ctrl_outw(ctrl_inw(SCSPTR0) & 0x17, SCSPTR0);
385 sci_out(port, SCFCR, fcr_val);
389 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
391 unsigned int fcr_val = 0;
393 if (cflag & CRTSCTS) {
394 fcr_val |= SCFCR_MCE;
396 #ifdef CONFIG_CPU_SUBTYPE_SH7343
398 #elif defined(CONFIG_CPU_SUBTYPE_SH7780) || \
399 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
400 defined(CONFIG_CPU_SUBTYPE_SHX3)
401 ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */
403 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
406 sci_out(port, SCFCR, fcr_val);
410 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
411 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
412 defined(CONFIG_CPU_SUBTYPE_SH7785)
413 static inline int scif_txroom(struct uart_port *port)
415 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0x7f);
418 static inline int scif_rxroom(struct uart_port *port)
420 return sci_in(port, SCRFDR) & 0x7f;
423 static inline int scif_txroom(struct uart_port *port)
425 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
428 static inline int scif_rxroom(struct uart_port *port)
430 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
433 #endif /* SCIF_ONLY || SCI_AND_SCIF */
435 static inline int sci_txroom(struct uart_port *port)
437 return ((sci_in(port, SCxSR) & SCI_TDRE) != 0);
440 static inline int sci_rxroom(struct uart_port *port)
442 return ((sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0);
445 /* ********************************************************************** *
446 * the interrupt related routines *
447 * ********************************************************************** */
449 static void sci_transmit_chars(struct uart_port *port)
451 struct circ_buf *xmit = &port->info->xmit;
452 unsigned int stopped = uart_tx_stopped(port);
453 unsigned short status;
457 status = sci_in(port, SCxSR);
458 if (!(status & SCxSR_TDxE(port))) {
459 ctrl = sci_in(port, SCSCR);
460 if (uart_circ_empty(xmit)) {
461 ctrl &= ~SCI_CTRL_FLAGS_TIE;
463 ctrl |= SCI_CTRL_FLAGS_TIE;
465 sci_out(port, SCSCR, ctrl);
470 if (port->type == PORT_SCIF)
471 count = scif_txroom(port);
474 count = sci_txroom(port);
482 } else if (!uart_circ_empty(xmit) && !stopped) {
483 c = xmit->buf[xmit->tail];
484 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
489 sci_out(port, SCxTDR, c);
492 } while (--count > 0);
494 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
496 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
497 uart_write_wakeup(port);
498 if (uart_circ_empty(xmit)) {
501 ctrl = sci_in(port, SCSCR);
503 #if !defined(SCI_ONLY)
504 if (port->type == PORT_SCIF) {
505 sci_in(port, SCxSR); /* Dummy read */
506 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
510 ctrl |= SCI_CTRL_FLAGS_TIE;
511 sci_out(port, SCSCR, ctrl);
515 /* On SH3, SCIF may read end-of-break as a space->mark char */
516 #define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
518 static inline void sci_receive_chars(struct uart_port *port)
520 struct sci_port *sci_port = (struct sci_port *)port;
521 struct tty_struct *tty = port->info->tty;
522 int i, count, copied = 0;
523 unsigned short status;
526 status = sci_in(port, SCxSR);
527 if (!(status & SCxSR_RDxF(port)))
531 #if !defined(SCI_ONLY)
532 if (port->type == PORT_SCIF)
533 count = scif_rxroom(port);
536 count = sci_rxroom(port);
538 /* Don't copy more bytes than there is room for in the buffer */
539 count = tty_buffer_request_room(tty, count);
541 /* If for any reason we can't copy more data, we're done! */
545 if (port->type == PORT_SCI) {
546 char c = sci_in(port, SCxRDR);
547 if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
550 tty_insert_flip_char(tty, c, TTY_NORMAL);
553 for (i=0; i<count; i++) {
554 char c = sci_in(port, SCxRDR);
555 status = sci_in(port, SCxSR);
556 #if defined(CONFIG_CPU_SH3)
557 /* Skip "chars" during break */
558 if (sci_port->break_flag) {
560 (status & SCxSR_FER(port))) {
565 /* Nonzero => end-of-break */
566 pr_debug("scif: debounce<%02x>\n", c);
567 sci_port->break_flag = 0;
574 #endif /* CONFIG_CPU_SH3 */
575 if (uart_handle_sysrq_char(port, c)) {
580 /* Store data and status */
581 if (status&SCxSR_FER(port)) {
583 pr_debug("sci: frame error\n");
584 } else if (status&SCxSR_PER(port)) {
586 pr_debug("sci: parity error\n");
589 tty_insert_flip_char(tty, c, flag);
593 sci_in(port, SCxSR); /* dummy read */
594 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
597 port->icount.rx += count;
601 /* Tell the rest of the system the news. New characters! */
602 tty_flip_buffer_push(tty);
604 sci_in(port, SCxSR); /* dummy read */
605 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
609 #define SCI_BREAK_JIFFIES (HZ/20)
610 /* The sci generates interrupts during the break,
611 * 1 per millisecond or so during the break period, for 9600 baud.
612 * So dont bother disabling interrupts.
613 * But dont want more than 1 break event.
614 * Use a kernel timer to periodically poll the rx line until
615 * the break is finished.
617 static void sci_schedule_break_timer(struct sci_port *port)
619 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
620 add_timer(&port->break_timer);
622 /* Ensure that two consecutive samples find the break over. */
623 static void sci_break_timer(unsigned long data)
625 struct sci_port *port = (struct sci_port *)data;
627 if (sci_rxd_in(&port->port) == 0) {
628 port->break_flag = 1;
629 sci_schedule_break_timer(port);
630 } else if (port->break_flag == 1) {
632 port->break_flag = 2;
633 sci_schedule_break_timer(port);
635 port->break_flag = 0;
638 static inline int sci_handle_errors(struct uart_port *port)
641 unsigned short status = sci_in(port, SCxSR);
642 struct tty_struct *tty = port->info->tty;
644 if (status & SCxSR_ORER(port)) {
646 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
648 pr_debug("sci: overrun error\n");
651 if (status & SCxSR_FER(port)) {
652 if (sci_rxd_in(port) == 0) {
653 /* Notify of BREAK */
654 struct sci_port *sci_port = (struct sci_port *)port;
656 if (!sci_port->break_flag) {
657 sci_port->break_flag = 1;
658 sci_schedule_break_timer(sci_port);
660 /* Do sysrq handling. */
661 if (uart_handle_break(port))
663 pr_debug("sci: BREAK detected\n");
664 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
669 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
671 pr_debug("sci: frame error\n");
675 if (status & SCxSR_PER(port)) {
677 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
679 pr_debug("sci: parity error\n");
683 tty_flip_buffer_push(tty);
688 static inline int sci_handle_breaks(struct uart_port *port)
691 unsigned short status = sci_in(port, SCxSR);
692 struct tty_struct *tty = port->info->tty;
693 struct sci_port *s = &sci_ports[port->line];
695 if (uart_handle_break(port))
698 if (!s->break_flag && status & SCxSR_BRK(port)) {
699 #if defined(CONFIG_CPU_SH3)
703 /* Notify of BREAK */
704 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
706 pr_debug("sci: BREAK detected\n");
709 #if defined(SCIF_ORER)
710 /* XXX: Handle SCIF overrun error */
711 if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
712 sci_out(port, SCLSR, 0);
713 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
715 pr_debug("sci: overrun error\n");
721 tty_flip_buffer_push(tty);
726 static irqreturn_t sci_rx_interrupt(int irq, void *port)
728 /* I think sci_receive_chars has to be called irrespective
729 * of whether the I_IXOFF is set, otherwise, how is the interrupt
732 sci_receive_chars(port);
737 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
739 struct uart_port *port = ptr;
741 spin_lock_irq(&port->lock);
742 sci_transmit_chars(port);
743 spin_unlock_irq(&port->lock);
748 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
750 struct uart_port *port = ptr;
753 if (port->type == PORT_SCI) {
754 if (sci_handle_errors(port)) {
755 /* discard character in rx buffer */
757 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
760 #if defined(SCIF_ORER)
761 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
762 struct tty_struct *tty = port->info->tty;
764 sci_out(port, SCLSR, 0);
765 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
766 tty_flip_buffer_push(tty);
767 pr_debug("scif: overrun error\n");
770 sci_rx_interrupt(irq, ptr);
773 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
775 /* Kick the transmission */
776 sci_tx_interrupt(irq, ptr);
781 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
783 struct uart_port *port = ptr;
786 sci_handle_breaks(port);
787 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
792 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
794 unsigned short ssr_status, scr_status;
795 struct uart_port *port = ptr;
797 ssr_status = sci_in(port,SCxSR);
798 scr_status = sci_in(port,SCSCR);
801 if ((ssr_status & 0x0020) && (scr_status & 0x0080))
802 sci_tx_interrupt(irq, ptr);
804 if ((ssr_status & 0x0002) && (scr_status & 0x0040))
805 sci_rx_interrupt(irq, ptr);
806 /* Error Interrupt */
807 if ((ssr_status & 0x0080) && (scr_status & 0x0400))
808 sci_er_interrupt(irq, ptr);
809 /* Break Interrupt */
810 if ((ssr_status & 0x0010) && (scr_status & 0x0200))
811 sci_br_interrupt(irq, ptr);
816 #ifdef CONFIG_CPU_FREQ
818 * Here we define a transistion notifier so that we can update all of our
819 * ports' baud rate when the peripheral clock changes.
821 static int sci_notifier(struct notifier_block *self,
822 unsigned long phase, void *p)
824 struct cpufreq_freqs *freqs = p;
827 if ((phase == CPUFREQ_POSTCHANGE) ||
828 (phase == CPUFREQ_RESUMECHANGE)){
829 for (i = 0; i < SCI_NPORTS; i++) {
830 struct uart_port *port = &sci_ports[i].port;
834 * Update the uartclk per-port if frequency has
835 * changed, since it will no longer necessarily be
836 * consistent with the old frequency.
838 * Really we want to be able to do something like
839 * uart_change_speed() or something along those lines
840 * here to implicitly reset the per-port baud rate..
842 * Clean this up later..
844 clk = clk_get(NULL, "module_clk");
845 port->uartclk = clk_get_rate(clk) * 16;
849 printk(KERN_INFO "%s: got a postchange notification "
850 "for cpu %d (old %d, new %d)\n",
851 __FUNCTION__, freqs->cpu, freqs->old, freqs->new);
857 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
858 #endif /* CONFIG_CPU_FREQ */
860 static int sci_request_irq(struct sci_port *port)
863 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
864 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
867 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
868 "SCI Transmit Data Empty", "SCI Break" };
870 if (port->irqs[0] == port->irqs[1]) {
871 if (!port->irqs[0]) {
872 printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
876 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
877 IRQF_DISABLED, "sci", port)) {
878 printk(KERN_ERR "sci: Cannot allocate irq.\n");
882 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
885 if (request_irq(port->irqs[i], handlers[i],
886 IRQF_DISABLED, desc[i], port)) {
887 printk(KERN_ERR "sci: Cannot allocate irq.\n");
896 static void sci_free_irq(struct sci_port *port)
900 if (port->irqs[0] == port->irqs[1]) {
902 printk("sci: sci_free_irq error\n");
904 free_irq(port->irqs[0], port);
906 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
910 free_irq(port->irqs[i], port);
915 static unsigned int sci_tx_empty(struct uart_port *port)
921 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
923 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
924 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
925 /* If you have signals for DTR and DCD, please implement here. */
928 static unsigned int sci_get_mctrl(struct uart_port *port)
930 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
933 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
936 static void sci_start_tx(struct uart_port *port)
940 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
941 ctrl = sci_in(port, SCSCR);
942 ctrl |= SCI_CTRL_FLAGS_TIE;
943 sci_out(port, SCSCR, ctrl);
946 static void sci_stop_tx(struct uart_port *port)
950 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
951 ctrl = sci_in(port, SCSCR);
952 ctrl &= ~SCI_CTRL_FLAGS_TIE;
953 sci_out(port, SCSCR, ctrl);
956 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
960 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
961 ctrl = sci_in(port, SCSCR);
962 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
963 sci_out(port, SCSCR, ctrl);
966 static void sci_stop_rx(struct uart_port *port)
970 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
971 ctrl = sci_in(port, SCSCR);
972 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
973 sci_out(port, SCSCR, ctrl);
976 static void sci_enable_ms(struct uart_port *port)
978 /* Nothing here yet .. */
981 static void sci_break_ctl(struct uart_port *port, int break_state)
983 /* Nothing here yet .. */
986 static int sci_startup(struct uart_port *port)
988 struct sci_port *s = &sci_ports[port->line];
993 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
994 s->clk = clk_get(NULL, "module_clk");
999 sci_start_rx(port, 1);
1004 static void sci_shutdown(struct uart_port *port)
1006 struct sci_port *s = &sci_ports[port->line];
1015 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1021 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
1022 struct ktermios *old)
1024 struct sci_port *s = &sci_ports[port->line];
1025 unsigned int status, baud, smr_val;
1028 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
1036 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1037 t = SCBRR_VALUE(baud, clk_get_rate(s->clk));
1039 t = SCBRR_VALUE(baud);
1046 status = sci_in(port, SCxSR);
1047 } while (!(status & SCxSR_TEND(port)));
1049 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
1051 #if !defined(SCI_ONLY)
1052 if (port->type == PORT_SCIF)
1053 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1056 smr_val = sci_in(port, SCSMR) & 3;
1057 if ((termios->c_cflag & CSIZE) == CS7)
1059 if (termios->c_cflag & PARENB)
1061 if (termios->c_cflag & PARODD)
1063 if (termios->c_cflag & CSTOPB)
1066 uart_update_timeout(port, termios->c_cflag, baud);
1068 sci_out(port, SCSMR, smr_val);
1072 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1075 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1077 sci_out(port, SCBRR, t);
1078 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1081 if (likely(s->init_pins))
1082 s->init_pins(port, termios->c_cflag);
1084 sci_out(port, SCSCR, SCSCR_INIT(port));
1086 if ((termios->c_cflag & CREAD) != 0)
1087 sci_start_rx(port,0);
1090 static const char *sci_type(struct uart_port *port)
1092 switch (port->type) {
1093 case PORT_SCI: return "sci";
1094 case PORT_SCIF: return "scif";
1095 case PORT_IRDA: return "irda";
1101 static void sci_release_port(struct uart_port *port)
1103 /* Nothing here yet .. */
1106 static int sci_request_port(struct uart_port *port)
1108 /* Nothing here yet .. */
1112 static void sci_config_port(struct uart_port *port, int flags)
1114 struct sci_port *s = &sci_ports[port->line];
1116 port->type = s->type;
1118 switch (port->type) {
1120 s->init_pins = sci_init_pins_sci;
1123 s->init_pins = sci_init_pins_scif;
1126 s->init_pins = sci_init_pins_irda;
1130 #if defined(CONFIG_CPU_SUBTYPE_SH5_101) || defined(CONFIG_CPU_SUBTYPE_SH5_103)
1131 if (port->mapbase == 0)
1132 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1134 port->membase = (void __iomem *)port->mapbase;
1138 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1140 struct sci_port *s = &sci_ports[port->line];
1142 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > NR_IRQS)
1144 if (ser->baud_base < 2400)
1145 /* No paper tape reader for Mitch.. */
1151 static struct uart_ops sci_uart_ops = {
1152 .tx_empty = sci_tx_empty,
1153 .set_mctrl = sci_set_mctrl,
1154 .get_mctrl = sci_get_mctrl,
1155 .start_tx = sci_start_tx,
1156 .stop_tx = sci_stop_tx,
1157 .stop_rx = sci_stop_rx,
1158 .enable_ms = sci_enable_ms,
1159 .break_ctl = sci_break_ctl,
1160 .startup = sci_startup,
1161 .shutdown = sci_shutdown,
1162 .set_termios = sci_set_termios,
1164 .release_port = sci_release_port,
1165 .request_port = sci_request_port,
1166 .config_port = sci_config_port,
1167 .verify_port = sci_verify_port,
1170 static void __init sci_init_ports(void)
1172 static int first = 1;
1180 for (i = 0; i < SCI_NPORTS; i++) {
1181 sci_ports[i].port.ops = &sci_uart_ops;
1182 sci_ports[i].port.iotype = UPIO_MEM;
1183 sci_ports[i].port.line = i;
1184 sci_ports[i].port.fifosize = 1;
1186 #if defined(__H8300H__) || defined(__H8300S__)
1188 sci_ports[i].enable = h8300_sci_enable;
1189 sci_ports[i].disable = h8300_sci_disable;
1191 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1192 #elif defined(CONFIG_SUPERH64)
1193 sci_ports[i].port.uartclk = current_cpu_data.module_clock * 16;
1196 * XXX: We should use a proper SCI/SCIF clock
1199 struct clk *clk = clk_get(NULL, "module_clk");
1200 sci_ports[i].port.uartclk = clk_get_rate(clk) * 16;
1205 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1206 sci_ports[i].break_timer.function = sci_break_timer;
1208 init_timer(&sci_ports[i].break_timer);
1212 int __init early_sci_setup(struct uart_port *port)
1214 if (unlikely(port->line > SCI_NPORTS))
1219 sci_ports[port->line].port.membase = port->membase;
1220 sci_ports[port->line].port.mapbase = port->mapbase;
1221 sci_ports[port->line].port.type = port->type;
1226 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1228 * Print a string to the serial port trying not to disturb
1229 * any possible real use of the port...
1231 static void serial_console_write(struct console *co, const char *s,
1234 put_string(serial_console_port, s, count);
1237 static int __init serial_console_setup(struct console *co, char *options)
1239 struct uart_port *port;
1247 * Check whether an invalid uart number has been specified, and
1248 * if so, search for the first available port that does have
1251 if (co->index >= SCI_NPORTS)
1254 serial_console_port = &sci_ports[co->index];
1255 port = &serial_console_port->port;
1258 * Also need to check port->type, we don't actually have any
1259 * UPIO_PORT ports, but uart_report_port() handily misreports
1260 * it anyways if we don't have a port available by the time this is
1265 if (!port->membase || !port->mapbase)
1268 port->type = serial_console_port->type;
1270 #if defined(CONFIG_SUPERH) && !defined(CONFIG_SUPERH64)
1271 if (!serial_console_port->clk)
1272 serial_console_port->clk = clk_get(NULL, "module_clk");
1275 if (port->flags & UPF_IOREMAP)
1276 sci_config_port(port, 0);
1278 if (serial_console_port->enable)
1279 serial_console_port->enable(port);
1282 uart_parse_options(options, &baud, &parity, &bits, &flow);
1284 ret = uart_set_options(port, co, baud, parity, bits, flow);
1285 #if defined(__H8300H__) || defined(__H8300S__)
1286 /* disable rx interrupt */
1293 static struct console serial_console = {
1295 .device = uart_console_device,
1296 .write = serial_console_write,
1297 .setup = serial_console_setup,
1298 .flags = CON_PRINTBUFFER,
1300 .data = &sci_uart_driver,
1303 static int __init sci_console_init(void)
1306 register_console(&serial_console);
1309 console_initcall(sci_console_init);
1310 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1312 #ifdef CONFIG_SH_KGDB_CONSOLE
1314 * FIXME: Most of this can go away.. at the moment, we rely on
1315 * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1316 * most of that can easily be done here instead.
1318 * For the time being, just accept the values that were parsed earlier..
1320 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1321 int *parity, int *bits)
1324 *parity = tolower(kgdb_parity);
1325 *bits = kgdb_bits - '0';
1329 * The naming here is somewhat misleading, since kgdb_console_setup() takes
1330 * care of the early-on initialization for kgdb, regardless of whether we
1331 * actually use kgdb as a console or not.
1333 * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1335 int __init kgdb_console_setup(struct console *co, char *options)
1337 struct uart_port *port = &sci_ports[kgdb_portnum].port;
1343 if (co->index != kgdb_portnum)
1344 co->index = kgdb_portnum;
1346 kgdb_sci_port = &sci_ports[co->index];
1347 port = &kgdb_sci_port->port;
1350 * Also need to check port->type, we don't actually have any
1351 * UPIO_PORT ports, but uart_report_port() handily misreports
1352 * it anyways if we don't have a port available by the time this is
1357 if (!port->membase || !port->mapbase)
1361 uart_parse_options(options, &baud, &parity, &bits, &flow);
1363 kgdb_console_get_options(port, &baud, &parity, &bits);
1365 kgdb_getchar = kgdb_sci_getchar;
1366 kgdb_putchar = kgdb_sci_putchar;
1368 return uart_set_options(port, co, baud, parity, bits, flow);
1371 static struct console kgdb_console = {
1373 .device = uart_console_device,
1374 .write = kgdb_console_write,
1375 .setup = kgdb_console_setup,
1376 .flags = CON_PRINTBUFFER,
1378 .data = &sci_uart_driver,
1381 /* Register the KGDB console so we get messages (d'oh!) */
1382 static int __init kgdb_console_init(void)
1385 register_console(&kgdb_console);
1388 console_initcall(kgdb_console_init);
1389 #endif /* CONFIG_SH_KGDB_CONSOLE */
1391 #if defined(CONFIG_SH_KGDB_CONSOLE)
1392 #define SCI_CONSOLE &kgdb_console
1393 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1394 #define SCI_CONSOLE &serial_console
1396 #define SCI_CONSOLE 0
1399 static char banner[] __initdata =
1400 KERN_INFO "SuperH SCI(F) driver initialized\n";
1402 static struct uart_driver sci_uart_driver = {
1403 .owner = THIS_MODULE,
1404 .driver_name = "sci",
1405 .dev_name = "ttySC",
1407 .minor = SCI_MINOR_START,
1409 .cons = SCI_CONSOLE,
1413 * Register a set of serial devices attached to a platform device. The
1414 * list is terminated with a zero flags entry, which means we expect
1415 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1416 * remapping (such as sh64) should also set UPF_IOREMAP.
1418 static int __devinit sci_probe(struct platform_device *dev)
1420 struct plat_sci_port *p = dev->dev.platform_data;
1423 for (i = 0; p && p->flags != 0; p++, i++) {
1424 struct sci_port *sciport = &sci_ports[i];
1427 if (unlikely(i == SCI_NPORTS)) {
1428 dev_notice(&dev->dev, "Attempting to register port "
1429 "%d when only %d are available.\n",
1431 dev_notice(&dev->dev, "Consider bumping "
1432 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1436 sciport->port.mapbase = p->mapbase;
1439 * For the simple (and majority of) cases where we don't need
1440 * to do any remapping, just cast the cookie directly.
1442 if (p->mapbase && !p->membase && !(p->flags & UPF_IOREMAP))
1443 p->membase = (void __iomem *)p->mapbase;
1445 sciport->port.membase = p->membase;
1447 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1448 sciport->port.flags = p->flags;
1449 sciport->port.dev = &dev->dev;
1451 sciport->type = sciport->port.type = p->type;
1453 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1455 uart_add_one_port(&sci_uart_driver, &sciport->port);
1458 #if defined(CONFIG_SH_KGDB) && !defined(CONFIG_SH_KGDB_CONSOLE)
1459 kgdb_sci_port = &sci_ports[kgdb_portnum];
1460 kgdb_getchar = kgdb_sci_getchar;
1461 kgdb_putchar = kgdb_sci_putchar;
1464 #ifdef CONFIG_CPU_FREQ
1465 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1466 dev_info(&dev->dev, "CPU frequency notifier registered\n");
1469 #ifdef CONFIG_SH_STANDARD_BIOS
1470 sh_bios_gdb_detach();
1476 static int __devexit sci_remove(struct platform_device *dev)
1480 for (i = 0; i < SCI_NPORTS; i++)
1481 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1486 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1490 for (i = 0; i < SCI_NPORTS; i++) {
1491 struct sci_port *p = &sci_ports[i];
1493 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1494 uart_suspend_port(&sci_uart_driver, &p->port);
1500 static int sci_resume(struct platform_device *dev)
1504 for (i = 0; i < SCI_NPORTS; i++) {
1505 struct sci_port *p = &sci_ports[i];
1507 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1508 uart_resume_port(&sci_uart_driver, &p->port);
1514 static struct platform_driver sci_driver = {
1516 .remove = __devexit_p(sci_remove),
1517 .suspend = sci_suspend,
1518 .resume = sci_resume,
1521 .owner = THIS_MODULE,
1525 static int __init sci_init(void)
1533 ret = uart_register_driver(&sci_uart_driver);
1534 if (likely(ret == 0)) {
1535 ret = platform_driver_register(&sci_driver);
1537 uart_unregister_driver(&sci_uart_driver);
1543 static void __exit sci_exit(void)
1545 platform_driver_unregister(&sci_driver);
1546 uart_unregister_driver(&sci_uart_driver);
1549 module_init(sci_init);
1550 module_exit(sci_exit);
1552 MODULE_LICENSE("GPL");