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>
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;
82 #ifdef CONFIG_HAVE_CLK
89 static struct sci_port *kgdb_sci_port;
92 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
93 static struct sci_port *serial_console_port;
96 /* Function prototypes */
97 static void sci_stop_tx(struct uart_port *port);
99 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
101 static struct sci_port sci_ports[SCI_NPORTS];
102 static struct uart_driver sci_uart_driver;
104 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && \
105 defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
106 static inline void handle_error(struct uart_port *port)
108 /* Clear error flags */
109 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
112 static int get_char(struct uart_port *port)
115 unsigned short status;
118 spin_lock_irqsave(&port->lock, flags);
120 status = sci_in(port, SCxSR);
121 if (status & SCxSR_ERRORS(port)) {
125 } while (!(status & SCxSR_RDxF(port)));
126 c = sci_in(port, SCxRDR);
127 sci_in(port, SCxSR); /* Dummy read */
128 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
129 spin_unlock_irqrestore(&port->lock, flags);
133 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
135 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) || defined(CONFIG_SH_KGDB)
136 static void put_char(struct uart_port *port, char c)
139 unsigned short status;
141 spin_lock_irqsave(&port->lock, flags);
144 status = sci_in(port, SCxSR);
145 } while (!(status & SCxSR_TDxE(port)));
147 sci_out(port, SCxTDR, c);
148 sci_in(port, SCxSR); /* Dummy read */
149 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
151 spin_unlock_irqrestore(&port->lock, flags);
155 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
156 static void put_string(struct sci_port *sci_port, const char *buffer, int count)
158 struct uart_port *port = &sci_port->port;
159 const unsigned char *p = buffer;
162 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
166 #ifdef CONFIG_SH_STANDARD_BIOS
167 /* This call only does a trap the first time it is
168 * called, and so is safe to do here unconditionally
170 usegdb |= sh_bios_in_gdb_mode();
172 #ifdef CONFIG_SH_KGDB
173 usegdb |= (kgdb_in_gdb_mode && (sci_port == kgdb_sci_port));
177 /* $<packet info>#<checksum>. */
181 put_char(port, 'O'); /* 'O'utput to console */
184 for (i=0; i<count; i++) { /* Don't use run length encoding */
195 put_char(port, hex_asc_hi(checksum));
196 put_char(port, hex_asc_lo(checksum));
197 } while (get_char(port) != '+');
199 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
200 for (i=0; i<count; i++) {
202 put_char(port, '\r');
203 put_char(port, *p++);
206 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
208 #ifdef CONFIG_SH_KGDB
209 static int kgdb_sci_getchar(void)
213 /* Keep trying to read a character, this could be neater */
214 while ((c = get_char(&kgdb_sci_port->port)) < 0)
220 static inline void kgdb_sci_putchar(int c)
222 put_char(&kgdb_sci_port->port, c);
224 #endif /* CONFIG_SH_KGDB */
226 #if defined(__H8300S__)
227 enum { sci_disable, sci_enable };
229 static void h8300_sci_config(struct uart_port* port, unsigned int ctrl)
231 volatile unsigned char *mstpcrl=(volatile unsigned char *)MSTPCRL;
232 int ch = (port->mapbase - SMR0) >> 3;
233 unsigned char mask = 1 << (ch+1);
235 if (ctrl == sci_disable) {
242 static inline void h8300_sci_enable(struct uart_port *port)
244 h8300_sci_config(port, sci_enable);
247 static inline void h8300_sci_disable(struct uart_port *port)
249 h8300_sci_config(port, sci_disable);
253 #if defined(__H8300H__) || defined(__H8300S__)
254 static void sci_init_pins_sci(struct uart_port* port, unsigned int cflag)
256 int ch = (port->mapbase - SMR0) >> 3;
259 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
260 h8300_sci_pins[ch].rx,
262 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
263 h8300_sci_pins[ch].tx,
267 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
270 #define sci_init_pins_sci NULL
273 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709)
274 static void sci_init_pins_irda(struct uart_port *port, unsigned int cflag)
276 unsigned int fcr_val = 0;
279 fcr_val |= SCFCR_MCE;
281 sci_out(port, SCFCR, fcr_val);
284 #define sci_init_pins_irda NULL
287 #if defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
288 static void sci_init_pins_scif(struct uart_port* port, unsigned int cflag)
290 unsigned int fcr_val = 0;
292 set_sh771x_scif_pfc(port);
293 if (cflag & CRTSCTS) {
294 fcr_val |= SCFCR_MCE;
296 sci_out(port, SCFCR, fcr_val);
298 #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
299 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
301 unsigned int fcr_val = 0;
304 if (cflag & CRTSCTS) {
306 if (port->mapbase == 0xa4430000) { /* SCIF0 */
307 /* Clear PTCR bit 9-2; enable all scif pins but sck */
308 data = ctrl_inw(PORT_PTCR);
309 ctrl_outw((data & 0xfc03), PORT_PTCR);
310 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
311 /* Clear PVCR bit 9-2 */
312 data = ctrl_inw(PORT_PVCR);
313 ctrl_outw((data & 0xfc03), PORT_PVCR);
315 fcr_val |= SCFCR_MCE;
317 if (port->mapbase == 0xa4430000) { /* SCIF0 */
318 /* Clear PTCR bit 5-2; enable only tx and rx */
319 data = ctrl_inw(PORT_PTCR);
320 ctrl_outw((data & 0xffc3), PORT_PTCR);
321 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
322 /* Clear PVCR bit 5-2 */
323 data = ctrl_inw(PORT_PVCR);
324 ctrl_outw((data & 0xffc3), PORT_PVCR);
327 sci_out(port, SCFCR, fcr_val);
329 #elif defined(CONFIG_CPU_SH3)
330 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
331 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
333 unsigned int fcr_val = 0;
336 /* We need to set SCPCR to enable RTS/CTS */
337 data = ctrl_inw(SCPCR);
338 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
339 ctrl_outw(data & 0x0fcf, SCPCR);
342 fcr_val |= SCFCR_MCE;
344 /* We need to set SCPCR to enable RTS/CTS */
345 data = ctrl_inw(SCPCR);
346 /* Clear out SCP7MD1,0, SCP4MD1,0,
347 Set SCP6MD1,0 = {01} (output) */
348 ctrl_outw((data & 0x0fcf) | 0x1000, SCPCR);
350 data = ctrl_inb(SCPDR);
351 /* Set /RTS2 (bit6) = 0 */
352 ctrl_outb(data & 0xbf, SCPDR);
355 sci_out(port, SCFCR, fcr_val);
357 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
358 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
360 unsigned int fcr_val = 0;
363 if (port->mapbase == 0xffe00000) {
364 data = ctrl_inw(PSCR);
367 fcr_val |= SCFCR_MCE;
371 ctrl_outw(data, PSCR);
373 /* SCIF1 and SCIF2 should be setup by board code */
375 sci_out(port, SCFCR, fcr_val);
377 #elif defined(CONFIG_CPU_SUBTYPE_SH7723)
378 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
380 /* Nothing to do here.. */
381 sci_out(port, SCFCR, 0);
385 static void sci_init_pins_scif(struct uart_port *port, unsigned int cflag)
387 unsigned int fcr_val = 0;
389 if (cflag & CRTSCTS) {
390 fcr_val |= SCFCR_MCE;
392 #if defined(CONFIG_CPU_SUBTYPE_SH7343) || defined(CONFIG_CPU_SUBTYPE_SH7366)
394 #elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \
395 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
396 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
397 defined(CONFIG_CPU_SUBTYPE_SHX3)
398 ctrl_outw(0x0080, SCSPTR0); /* Set RTS = 1 */
400 ctrl_outw(0x0080, SCSPTR2); /* Set RTS = 1 */
403 sci_out(port, SCFCR, fcr_val);
407 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
408 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
409 defined(CONFIG_CPU_SUBTYPE_SH7785)
410 static inline int scif_txroom(struct uart_port *port)
412 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
415 static inline int scif_rxroom(struct uart_port *port)
417 return sci_in(port, SCRFDR) & 0xff;
419 #elif defined(CONFIG_CPU_SUBTYPE_SH7763)
420 static inline int scif_txroom(struct uart_port *port)
422 if((port->mapbase == 0xffe00000) || (port->mapbase == 0xffe08000)) /* SCIF0/1*/
423 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
425 return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
428 static inline int scif_rxroom(struct uart_port *port)
430 if((port->mapbase == 0xffe00000) || (port->mapbase == 0xffe08000)) /* SCIF0/1*/
431 return sci_in(port, SCRFDR) & 0xff;
433 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
436 static inline int scif_txroom(struct uart_port *port)
438 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
441 static inline int scif_rxroom(struct uart_port *port)
443 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
447 static inline int sci_txroom(struct uart_port *port)
449 return ((sci_in(port, SCxSR) & SCI_TDRE) != 0);
452 static inline int sci_rxroom(struct uart_port *port)
454 return ((sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0);
457 /* ********************************************************************** *
458 * the interrupt related routines *
459 * ********************************************************************** */
461 static void sci_transmit_chars(struct uart_port *port)
463 struct circ_buf *xmit = &port->info->xmit;
464 unsigned int stopped = uart_tx_stopped(port);
465 unsigned short status;
469 status = sci_in(port, SCxSR);
470 if (!(status & SCxSR_TDxE(port))) {
471 ctrl = sci_in(port, SCSCR);
472 if (uart_circ_empty(xmit)) {
473 ctrl &= ~SCI_CTRL_FLAGS_TIE;
475 ctrl |= SCI_CTRL_FLAGS_TIE;
477 sci_out(port, SCSCR, ctrl);
481 if (port->type == PORT_SCIF)
482 count = scif_txroom(port);
484 count = sci_txroom(port);
492 } else if (!uart_circ_empty(xmit) && !stopped) {
493 c = xmit->buf[xmit->tail];
494 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
499 sci_out(port, SCxTDR, c);
502 } while (--count > 0);
504 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
506 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
507 uart_write_wakeup(port);
508 if (uart_circ_empty(xmit)) {
511 ctrl = sci_in(port, SCSCR);
513 if (port->type == PORT_SCIF) {
514 sci_in(port, SCxSR); /* Dummy read */
515 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
518 ctrl |= SCI_CTRL_FLAGS_TIE;
519 sci_out(port, SCSCR, ctrl);
523 /* On SH3, SCIF may read end-of-break as a space->mark char */
524 #define STEPFN(c) ({int __c=(c); (((__c-1)|(__c)) == -1); })
526 static inline void sci_receive_chars(struct uart_port *port)
528 struct sci_port *sci_port = (struct sci_port *)port;
529 struct tty_struct *tty = port->info->port.tty;
530 int i, count, copied = 0;
531 unsigned short status;
534 status = sci_in(port, SCxSR);
535 if (!(status & SCxSR_RDxF(port)))
539 if (port->type == PORT_SCIF)
540 count = scif_rxroom(port);
542 count = sci_rxroom(port);
544 /* Don't copy more bytes than there is room for in the buffer */
545 count = tty_buffer_request_room(tty, count);
547 /* If for any reason we can't copy more data, we're done! */
551 if (port->type == PORT_SCI) {
552 char c = sci_in(port, SCxRDR);
553 if (uart_handle_sysrq_char(port, c) || sci_port->break_flag)
556 tty_insert_flip_char(tty, c, TTY_NORMAL);
559 for (i=0; i<count; i++) {
560 char c = sci_in(port, SCxRDR);
561 status = sci_in(port, SCxSR);
562 #if defined(CONFIG_CPU_SH3)
563 /* Skip "chars" during break */
564 if (sci_port->break_flag) {
566 (status & SCxSR_FER(port))) {
571 /* Nonzero => end-of-break */
572 pr_debug("scif: debounce<%02x>\n", c);
573 sci_port->break_flag = 0;
580 #endif /* CONFIG_CPU_SH3 */
581 if (uart_handle_sysrq_char(port, c)) {
586 /* Store data and status */
587 if (status&SCxSR_FER(port)) {
589 pr_debug("sci: frame error\n");
590 } else if (status&SCxSR_PER(port)) {
592 pr_debug("sci: parity error\n");
595 tty_insert_flip_char(tty, c, flag);
599 sci_in(port, SCxSR); /* dummy read */
600 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
603 port->icount.rx += count;
607 /* Tell the rest of the system the news. New characters! */
608 tty_flip_buffer_push(tty);
610 sci_in(port, SCxSR); /* dummy read */
611 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
615 #define SCI_BREAK_JIFFIES (HZ/20)
616 /* The sci generates interrupts during the break,
617 * 1 per millisecond or so during the break period, for 9600 baud.
618 * So dont bother disabling interrupts.
619 * But dont want more than 1 break event.
620 * Use a kernel timer to periodically poll the rx line until
621 * the break is finished.
623 static void sci_schedule_break_timer(struct sci_port *port)
625 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
626 add_timer(&port->break_timer);
628 /* Ensure that two consecutive samples find the break over. */
629 static void sci_break_timer(unsigned long data)
631 struct sci_port *port = (struct sci_port *)data;
633 if (sci_rxd_in(&port->port) == 0) {
634 port->break_flag = 1;
635 sci_schedule_break_timer(port);
636 } else if (port->break_flag == 1) {
638 port->break_flag = 2;
639 sci_schedule_break_timer(port);
641 port->break_flag = 0;
644 static inline int sci_handle_errors(struct uart_port *port)
647 unsigned short status = sci_in(port, SCxSR);
648 struct tty_struct *tty = port->info->port.tty;
650 if (status & SCxSR_ORER(port)) {
652 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
654 pr_debug("sci: overrun error\n");
657 if (status & SCxSR_FER(port)) {
658 if (sci_rxd_in(port) == 0) {
659 /* Notify of BREAK */
660 struct sci_port *sci_port = (struct sci_port *)port;
662 if (!sci_port->break_flag) {
663 sci_port->break_flag = 1;
664 sci_schedule_break_timer(sci_port);
666 /* Do sysrq handling. */
667 if (uart_handle_break(port))
669 pr_debug("sci: BREAK detected\n");
670 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
675 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
677 pr_debug("sci: frame error\n");
681 if (status & SCxSR_PER(port)) {
683 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
685 pr_debug("sci: parity error\n");
689 tty_flip_buffer_push(tty);
694 static inline int sci_handle_breaks(struct uart_port *port)
697 unsigned short status = sci_in(port, SCxSR);
698 struct tty_struct *tty = port->info->port.tty;
699 struct sci_port *s = &sci_ports[port->line];
701 if (uart_handle_break(port))
704 if (!s->break_flag && status & SCxSR_BRK(port)) {
705 #if defined(CONFIG_CPU_SH3)
709 /* Notify of BREAK */
710 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
712 pr_debug("sci: BREAK detected\n");
715 #if defined(SCIF_ORER)
716 /* XXX: Handle SCIF overrun error */
717 if (port->type == PORT_SCIF && (sci_in(port, SCLSR) & SCIF_ORER) != 0) {
718 sci_out(port, SCLSR, 0);
719 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN)) {
721 pr_debug("sci: overrun error\n");
727 tty_flip_buffer_push(tty);
732 static irqreturn_t sci_rx_interrupt(int irq, void *port)
734 /* I think sci_receive_chars has to be called irrespective
735 * of whether the I_IXOFF is set, otherwise, how is the interrupt
738 sci_receive_chars(port);
743 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
745 struct uart_port *port = ptr;
747 spin_lock_irq(&port->lock);
748 sci_transmit_chars(port);
749 spin_unlock_irq(&port->lock);
754 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
756 struct uart_port *port = ptr;
759 if (port->type == PORT_SCI) {
760 if (sci_handle_errors(port)) {
761 /* discard character in rx buffer */
763 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
766 #if defined(SCIF_ORER)
767 if((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
768 struct tty_struct *tty = port->info->port.tty;
770 sci_out(port, SCLSR, 0);
771 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
772 tty_flip_buffer_push(tty);
773 pr_debug("scif: overrun error\n");
776 sci_rx_interrupt(irq, ptr);
779 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
781 /* Kick the transmission */
782 sci_tx_interrupt(irq, ptr);
787 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
789 struct uart_port *port = ptr;
792 sci_handle_breaks(port);
793 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
798 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
800 unsigned short ssr_status, scr_status;
801 struct uart_port *port = ptr;
803 ssr_status = sci_in(port,SCxSR);
804 scr_status = sci_in(port,SCSCR);
807 if ((ssr_status & 0x0020) && (scr_status & 0x0080))
808 sci_tx_interrupt(irq, ptr);
810 if ((ssr_status & 0x0002) && (scr_status & 0x0040))
811 sci_rx_interrupt(irq, ptr);
812 /* Error Interrupt */
813 if ((ssr_status & 0x0080) && (scr_status & 0x0400))
814 sci_er_interrupt(irq, ptr);
815 /* Break Interrupt */
816 if ((ssr_status & 0x0010) && (scr_status & 0x0200))
817 sci_br_interrupt(irq, ptr);
822 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_HAVE_CLK)
824 * Here we define a transistion notifier so that we can update all of our
825 * ports' baud rate when the peripheral clock changes.
827 static int sci_notifier(struct notifier_block *self,
828 unsigned long phase, void *p)
830 struct cpufreq_freqs *freqs = p;
833 if ((phase == CPUFREQ_POSTCHANGE) ||
834 (phase == CPUFREQ_RESUMECHANGE)){
835 for (i = 0; i < SCI_NPORTS; i++) {
836 struct uart_port *port = &sci_ports[i].port;
840 * Update the uartclk per-port if frequency has
841 * changed, since it will no longer necessarily be
842 * consistent with the old frequency.
844 * Really we want to be able to do something like
845 * uart_change_speed() or something along those lines
846 * here to implicitly reset the per-port baud rate..
848 * Clean this up later..
850 clk = clk_get(NULL, "module_clk");
851 port->uartclk = clk_get_rate(clk);
855 printk(KERN_INFO "%s: got a postchange notification "
856 "for cpu %d (old %d, new %d)\n",
857 __func__, freqs->cpu, freqs->old, freqs->new);
863 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
864 #endif /* CONFIG_CPU_FREQ && CONFIG_HAVE_CLK */
866 static int sci_request_irq(struct sci_port *port)
869 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
870 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
873 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
874 "SCI Transmit Data Empty", "SCI Break" };
876 if (port->irqs[0] == port->irqs[1]) {
877 if (!port->irqs[0]) {
878 printk(KERN_ERR "sci: Cannot allocate irq.(IRQ=0)\n");
882 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
883 IRQF_DISABLED, "sci", port)) {
884 printk(KERN_ERR "sci: Cannot allocate irq.\n");
888 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
891 if (request_irq(port->irqs[i], handlers[i],
892 IRQF_DISABLED, desc[i], port)) {
893 printk(KERN_ERR "sci: Cannot allocate irq.\n");
902 static void sci_free_irq(struct sci_port *port)
906 if (port->irqs[0] == port->irqs[1]) {
908 printk("sci: sci_free_irq error\n");
910 free_irq(port->irqs[0], port);
912 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
916 free_irq(port->irqs[i], port);
921 static unsigned int sci_tx_empty(struct uart_port *port)
927 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
929 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
930 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
931 /* If you have signals for DTR and DCD, please implement here. */
934 static unsigned int sci_get_mctrl(struct uart_port *port)
936 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
939 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
942 static void sci_start_tx(struct uart_port *port)
946 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
947 ctrl = sci_in(port, SCSCR);
948 ctrl |= SCI_CTRL_FLAGS_TIE;
949 sci_out(port, SCSCR, ctrl);
952 static void sci_stop_tx(struct uart_port *port)
956 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
957 ctrl = sci_in(port, SCSCR);
958 ctrl &= ~SCI_CTRL_FLAGS_TIE;
959 sci_out(port, SCSCR, ctrl);
962 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
966 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
967 ctrl = sci_in(port, SCSCR);
968 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
969 sci_out(port, SCSCR, ctrl);
972 static void sci_stop_rx(struct uart_port *port)
976 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
977 ctrl = sci_in(port, SCSCR);
978 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
979 sci_out(port, SCSCR, ctrl);
982 static void sci_enable_ms(struct uart_port *port)
984 /* Nothing here yet .. */
987 static void sci_break_ctl(struct uart_port *port, int break_state)
989 /* Nothing here yet .. */
992 static int sci_startup(struct uart_port *port)
994 struct sci_port *s = &sci_ports[port->line];
999 #ifdef CONFIG_HAVE_CLK
1000 s->clk = clk_get(NULL, "module_clk");
1005 sci_start_rx(port, 1);
1010 static void sci_shutdown(struct uart_port *port)
1012 struct sci_port *s = &sci_ports[port->line];
1021 #ifdef CONFIG_HAVE_CLK
1027 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
1028 struct ktermios *old)
1030 struct sci_port *s = &sci_ports[port->line];
1031 unsigned int status, baud, smr_val;
1034 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
1036 t = SCBRR_VALUE(baud, port->uartclk);
1039 status = sci_in(port, SCxSR);
1040 } while (!(status & SCxSR_TEND(port)));
1042 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
1044 if (port->type == PORT_SCIF)
1045 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
1047 smr_val = sci_in(port, SCSMR) & 3;
1048 if ((termios->c_cflag & CSIZE) == CS7)
1050 if (termios->c_cflag & PARENB)
1052 if (termios->c_cflag & PARODD)
1054 if (termios->c_cflag & CSTOPB)
1057 uart_update_timeout(port, termios->c_cflag, baud);
1059 sci_out(port, SCSMR, smr_val);
1063 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
1066 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
1068 sci_out(port, SCBRR, t);
1069 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
1072 if (likely(s->init_pins))
1073 s->init_pins(port, termios->c_cflag);
1075 sci_out(port, SCSCR, SCSCR_INIT(port));
1077 if ((termios->c_cflag & CREAD) != 0)
1078 sci_start_rx(port,0);
1081 static const char *sci_type(struct uart_port *port)
1083 switch (port->type) {
1084 case PORT_SCI: return "sci";
1085 case PORT_SCIF: return "scif";
1086 case PORT_IRDA: return "irda";
1092 static void sci_release_port(struct uart_port *port)
1094 /* Nothing here yet .. */
1097 static int sci_request_port(struct uart_port *port)
1099 /* Nothing here yet .. */
1103 static void sci_config_port(struct uart_port *port, int flags)
1105 struct sci_port *s = &sci_ports[port->line];
1107 port->type = s->type;
1109 switch (port->type) {
1111 s->init_pins = sci_init_pins_sci;
1114 s->init_pins = sci_init_pins_scif;
1117 s->init_pins = sci_init_pins_irda;
1121 if (port->flags & UPF_IOREMAP && !port->membase) {
1122 #if defined(CONFIG_SUPERH64)
1123 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
1124 port->membase = (void __iomem *)port->mapbase;
1126 port->membase = ioremap_nocache(port->mapbase, 0x40);
1129 printk(KERN_ERR "sci: can't remap port#%d\n", port->line);
1133 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
1135 struct sci_port *s = &sci_ports[port->line];
1137 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
1139 if (ser->baud_base < 2400)
1140 /* No paper tape reader for Mitch.. */
1146 static struct uart_ops sci_uart_ops = {
1147 .tx_empty = sci_tx_empty,
1148 .set_mctrl = sci_set_mctrl,
1149 .get_mctrl = sci_get_mctrl,
1150 .start_tx = sci_start_tx,
1151 .stop_tx = sci_stop_tx,
1152 .stop_rx = sci_stop_rx,
1153 .enable_ms = sci_enable_ms,
1154 .break_ctl = sci_break_ctl,
1155 .startup = sci_startup,
1156 .shutdown = sci_shutdown,
1157 .set_termios = sci_set_termios,
1159 .release_port = sci_release_port,
1160 .request_port = sci_request_port,
1161 .config_port = sci_config_port,
1162 .verify_port = sci_verify_port,
1165 static void __init sci_init_ports(void)
1167 static int first = 1;
1175 for (i = 0; i < SCI_NPORTS; i++) {
1176 sci_ports[i].port.ops = &sci_uart_ops;
1177 sci_ports[i].port.iotype = UPIO_MEM;
1178 sci_ports[i].port.line = i;
1179 sci_ports[i].port.fifosize = 1;
1181 #if defined(__H8300H__) || defined(__H8300S__)
1183 sci_ports[i].enable = h8300_sci_enable;
1184 sci_ports[i].disable = h8300_sci_disable;
1186 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1187 #elif defined(CONFIG_HAVE_CLK)
1189 * XXX: We should use a proper SCI/SCIF clock
1192 struct clk *clk = clk_get(NULL, "module_clk");
1193 sci_ports[i].port.uartclk = clk_get_rate(clk);
1197 #error "Need a valid uartclk"
1200 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1201 sci_ports[i].break_timer.function = sci_break_timer;
1203 init_timer(&sci_ports[i].break_timer);
1207 int __init early_sci_setup(struct uart_port *port)
1209 if (unlikely(port->line > SCI_NPORTS))
1214 sci_ports[port->line].port.membase = port->membase;
1215 sci_ports[port->line].port.mapbase = port->mapbase;
1216 sci_ports[port->line].port.type = port->type;
1221 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1223 * Print a string to the serial port trying not to disturb
1224 * any possible real use of the port...
1226 static void serial_console_write(struct console *co, const char *s,
1229 put_string(serial_console_port, s, count);
1232 static int __init serial_console_setup(struct console *co, char *options)
1234 struct uart_port *port;
1242 * Check whether an invalid uart number has been specified, and
1243 * if so, search for the first available port that does have
1246 if (co->index >= SCI_NPORTS)
1249 serial_console_port = &sci_ports[co->index];
1250 port = &serial_console_port->port;
1253 * Also need to check port->type, we don't actually have any
1254 * UPIO_PORT ports, but uart_report_port() handily misreports
1255 * it anyways if we don't have a port available by the time this is
1260 if (!port->membase || !port->mapbase)
1263 port->type = serial_console_port->type;
1265 #ifdef CONFIG_HAVE_CLK
1266 if (!serial_console_port->clk)
1267 serial_console_port->clk = clk_get(NULL, "module_clk");
1270 if (port->flags & UPF_IOREMAP)
1271 sci_config_port(port, 0);
1273 if (serial_console_port->enable)
1274 serial_console_port->enable(port);
1277 uart_parse_options(options, &baud, &parity, &bits, &flow);
1279 ret = uart_set_options(port, co, baud, parity, bits, flow);
1280 #if defined(__H8300H__) || defined(__H8300S__)
1281 /* disable rx interrupt */
1288 static struct console serial_console = {
1290 .device = uart_console_device,
1291 .write = serial_console_write,
1292 .setup = serial_console_setup,
1293 .flags = CON_PRINTBUFFER,
1295 .data = &sci_uart_driver,
1298 static int __init sci_console_init(void)
1301 register_console(&serial_console);
1304 console_initcall(sci_console_init);
1305 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1307 #ifdef CONFIG_SH_KGDB_CONSOLE
1309 * FIXME: Most of this can go away.. at the moment, we rely on
1310 * arch/sh/kernel/setup.c to do the command line parsing for kgdb, though
1311 * most of that can easily be done here instead.
1313 * For the time being, just accept the values that were parsed earlier..
1315 static void __init kgdb_console_get_options(struct uart_port *port, int *baud,
1316 int *parity, int *bits)
1319 *parity = tolower(kgdb_parity);
1320 *bits = kgdb_bits - '0';
1324 * The naming here is somewhat misleading, since kgdb_console_setup() takes
1325 * care of the early-on initialization for kgdb, regardless of whether we
1326 * actually use kgdb as a console or not.
1328 * On the plus side, this lets us kill off the old kgdb_sci_setup() nonsense.
1330 int __init kgdb_console_setup(struct console *co, char *options)
1332 struct uart_port *port = &sci_ports[kgdb_portnum].port;
1338 if (co->index != kgdb_portnum)
1339 co->index = kgdb_portnum;
1341 kgdb_sci_port = &sci_ports[co->index];
1342 port = &kgdb_sci_port->port;
1345 * Also need to check port->type, we don't actually have any
1346 * UPIO_PORT ports, but uart_report_port() handily misreports
1347 * it anyways if we don't have a port available by the time this is
1352 if (!port->membase || !port->mapbase)
1356 uart_parse_options(options, &baud, &parity, &bits, &flow);
1358 kgdb_console_get_options(port, &baud, &parity, &bits);
1360 kgdb_getchar = kgdb_sci_getchar;
1361 kgdb_putchar = kgdb_sci_putchar;
1363 return uart_set_options(port, co, baud, parity, bits, flow);
1366 static struct console kgdb_console = {
1368 .device = uart_console_device,
1369 .write = kgdb_console_write,
1370 .setup = kgdb_console_setup,
1371 .flags = CON_PRINTBUFFER,
1373 .data = &sci_uart_driver,
1376 /* Register the KGDB console so we get messages (d'oh!) */
1377 static int __init kgdb_console_init(void)
1380 register_console(&kgdb_console);
1383 console_initcall(kgdb_console_init);
1384 #endif /* CONFIG_SH_KGDB_CONSOLE */
1386 #if defined(CONFIG_SH_KGDB_CONSOLE)
1387 #define SCI_CONSOLE &kgdb_console
1388 #elif defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1389 #define SCI_CONSOLE &serial_console
1391 #define SCI_CONSOLE 0
1394 static char banner[] __initdata =
1395 KERN_INFO "SuperH SCI(F) driver initialized\n";
1397 static struct uart_driver sci_uart_driver = {
1398 .owner = THIS_MODULE,
1399 .driver_name = "sci",
1400 .dev_name = "ttySC",
1402 .minor = SCI_MINOR_START,
1404 .cons = SCI_CONSOLE,
1408 * Register a set of serial devices attached to a platform device. The
1409 * list is terminated with a zero flags entry, which means we expect
1410 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1411 * remapping (such as sh64) should also set UPF_IOREMAP.
1413 static int __devinit sci_probe(struct platform_device *dev)
1415 struct plat_sci_port *p = dev->dev.platform_data;
1416 int i, ret = -EINVAL;
1418 for (i = 0; p && p->flags != 0; p++, i++) {
1419 struct sci_port *sciport = &sci_ports[i];
1422 if (unlikely(i == SCI_NPORTS)) {
1423 dev_notice(&dev->dev, "Attempting to register port "
1424 "%d when only %d are available.\n",
1426 dev_notice(&dev->dev, "Consider bumping "
1427 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1431 sciport->port.mapbase = p->mapbase;
1433 if (p->mapbase && !p->membase) {
1434 if (p->flags & UPF_IOREMAP) {
1435 p->membase = ioremap_nocache(p->mapbase, 0x40);
1436 if (IS_ERR(p->membase)) {
1437 ret = PTR_ERR(p->membase);
1442 * For the simple (and majority of) cases
1443 * where we don't need to do any remapping,
1444 * just cast the cookie directly.
1446 p->membase = (void __iomem *)p->mapbase;
1450 sciport->port.membase = p->membase;
1452 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1453 sciport->port.flags = p->flags;
1454 sciport->port.dev = &dev->dev;
1456 sciport->type = sciport->port.type = p->type;
1458 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1460 uart_add_one_port(&sci_uart_driver, &sciport->port);
1463 #if defined(CONFIG_SH_KGDB) && !defined(CONFIG_SH_KGDB_CONSOLE)
1464 kgdb_sci_port = &sci_ports[kgdb_portnum];
1465 kgdb_getchar = kgdb_sci_getchar;
1466 kgdb_putchar = kgdb_sci_putchar;
1469 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_HAVE_CLK)
1470 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1471 dev_info(&dev->dev, "CPU frequency notifier registered\n");
1474 #ifdef CONFIG_SH_STANDARD_BIOS
1475 sh_bios_gdb_detach();
1481 for (i = i - 1; i >= 0; i--)
1482 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1487 static int __devexit sci_remove(struct platform_device *dev)
1491 for (i = 0; i < SCI_NPORTS; i++)
1492 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1497 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1501 for (i = 0; i < SCI_NPORTS; i++) {
1502 struct sci_port *p = &sci_ports[i];
1504 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1505 uart_suspend_port(&sci_uart_driver, &p->port);
1511 static int sci_resume(struct platform_device *dev)
1515 for (i = 0; i < SCI_NPORTS; i++) {
1516 struct sci_port *p = &sci_ports[i];
1518 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1519 uart_resume_port(&sci_uart_driver, &p->port);
1525 static struct platform_driver sci_driver = {
1527 .remove = __devexit_p(sci_remove),
1528 .suspend = sci_suspend,
1529 .resume = sci_resume,
1532 .owner = THIS_MODULE,
1536 static int __init sci_init(void)
1544 ret = uart_register_driver(&sci_uart_driver);
1545 if (likely(ret == 0)) {
1546 ret = platform_driver_register(&sci_driver);
1548 uart_unregister_driver(&sci_uart_driver);
1554 static void __exit sci_exit(void)
1556 platform_driver_unregister(&sci_driver);
1557 uart_unregister_driver(&sci_uart_driver);
1560 module_init(sci_init);
1561 module_exit(sci_exit);
1563 MODULE_LICENSE("GPL");
1564 MODULE_ALIAS("platform:sh-sci");