2 * drivers/serial/sh-sci.c
4 * SuperH on-chip serial module support. (SCI with no FIFO / with FIFO)
6 * Copyright (C) 2002 - 2008 Paul Mundt
7 * Modified to support SH7720 SCIF. Markus Brunner, Mark Jonas (Jul 2007).
9 * based off of the old drivers/char/sh-sci.c by:
11 * Copyright (C) 1999, 2000 Niibe Yutaka
12 * Copyright (C) 2000 Sugioka Toshinobu
13 * Modified to support multiple serial ports. Stuart Menefy (May 2000).
14 * Modified to support SecureEdge. David McCullough (2002)
15 * Modified to support SH7300 SCIF. Takashi Kusuda (Jun 2003).
16 * Removed SH7300 support (Jul 2007).
18 * This file is subject to the terms and conditions of the GNU General Public
19 * License. See the file "COPYING" in the main directory of this archive
22 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/timer.h>
31 #include <linux/interrupt.h>
32 #include <linux/tty.h>
33 #include <linux/tty_flip.h>
34 #include <linux/serial.h>
35 #include <linux/major.h>
36 #include <linux/string.h>
37 #include <linux/sysrq.h>
38 #include <linux/ioport.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
42 #include <linux/console.h>
43 #include <linux/platform_device.h>
44 #include <linux/serial_sci.h>
45 #include <linux/notifier.h>
46 #include <linux/cpufreq.h>
47 #include <linux/clk.h>
48 #include <linux/ctype.h>
49 #include <linux/err.h>
52 #include <asm/clock.h>
53 #include <asm/sh_bios.h>
59 struct uart_port port;
64 /* Port IRQs: ERI, RXI, TXI, BRI (optional) */
65 unsigned int irqs[SCIx_NR_IRQS];
67 /* Port enable callback */
68 void (*enable)(struct uart_port *port);
70 /* Port disable callback */
71 void (*disable)(struct uart_port *port);
74 struct timer_list break_timer;
77 #ifdef CONFIG_HAVE_CLK
83 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
84 static struct sci_port *serial_console_port;
87 /* Function prototypes */
88 static void sci_stop_tx(struct uart_port *port);
90 #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS
92 static struct sci_port sci_ports[SCI_NPORTS];
93 static struct uart_driver sci_uart_driver;
95 static inline struct sci_port *
96 to_sci_port(struct uart_port *uart)
98 return container_of(uart, struct sci_port, port);
101 #if defined(CONFIG_CONSOLE_POLL) || defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
103 #ifdef CONFIG_CONSOLE_POLL
104 static inline void handle_error(struct uart_port *port)
106 /* Clear error flags */
107 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
110 static int sci_poll_get_char(struct uart_port *port)
112 unsigned short status;
116 status = sci_in(port, SCxSR);
117 if (status & SCxSR_ERRORS(port)) {
121 } while (!(status & SCxSR_RDxF(port)));
123 c = sci_in(port, SCxRDR);
127 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
133 static void sci_poll_put_char(struct uart_port *port, unsigned char c)
135 unsigned short status;
138 status = sci_in(port, SCxSR);
139 } while (!(status & SCxSR_TDxE(port)));
141 sci_in(port, SCxSR); /* Dummy read */
142 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
143 sci_out(port, SCxTDR, c);
145 #endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
147 #if defined(__H8300S__)
148 enum { sci_disable, sci_enable };
150 static void h8300_sci_config(struct uart_port *port, unsigned int ctrl)
152 volatile unsigned char *mstpcrl = (volatile unsigned char *)MSTPCRL;
153 int ch = (port->mapbase - SMR0) >> 3;
154 unsigned char mask = 1 << (ch+1);
156 if (ctrl == sci_disable)
162 static inline void h8300_sci_enable(struct uart_port *port)
164 h8300_sci_config(port, sci_enable);
167 static inline void h8300_sci_disable(struct uart_port *port)
169 h8300_sci_config(port, sci_disable);
173 #if defined(__H8300H__) || defined(__H8300S__)
174 static void sci_init_pins(struct uart_port *port, unsigned int cflag)
176 int ch = (port->mapbase - SMR0) >> 3;
179 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
180 h8300_sci_pins[ch].rx,
182 H8300_GPIO_DDR(h8300_sci_pins[ch].port,
183 h8300_sci_pins[ch].tx,
187 H8300_SCI_DR(ch) |= h8300_sci_pins[ch].tx;
189 #elif defined(CONFIG_CPU_SUBTYPE_SH7710) || defined(CONFIG_CPU_SUBTYPE_SH7712)
190 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
192 if (port->mapbase == 0xA4400000) {
193 __raw_writew(__raw_readw(PACR) & 0xffc0, PACR);
194 __raw_writew(__raw_readw(PBCR) & 0x0fff, PBCR);
195 } else if (port->mapbase == 0xA4410000)
196 __raw_writew(__raw_readw(PBCR) & 0xf003, PBCR);
198 #elif defined(CONFIG_CPU_SUBTYPE_SH7720) || defined(CONFIG_CPU_SUBTYPE_SH7721)
199 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
203 if (cflag & CRTSCTS) {
205 if (port->mapbase == 0xa4430000) { /* SCIF0 */
206 /* Clear PTCR bit 9-2; enable all scif pins but sck */
207 data = __raw_readw(PORT_PTCR);
208 __raw_writew((data & 0xfc03), PORT_PTCR);
209 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
210 /* Clear PVCR bit 9-2 */
211 data = __raw_readw(PORT_PVCR);
212 __raw_writew((data & 0xfc03), PORT_PVCR);
215 if (port->mapbase == 0xa4430000) { /* SCIF0 */
216 /* Clear PTCR bit 5-2; enable only tx and rx */
217 data = __raw_readw(PORT_PTCR);
218 __raw_writew((data & 0xffc3), PORT_PTCR);
219 } else if (port->mapbase == 0xa4438000) { /* SCIF1 */
220 /* Clear PVCR bit 5-2 */
221 data = __raw_readw(PORT_PVCR);
222 __raw_writew((data & 0xffc3), PORT_PVCR);
226 #elif defined(CONFIG_CPU_SH3)
227 /* For SH7705, SH7706, SH7707, SH7709, SH7709A, SH7729 */
228 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
232 /* We need to set SCPCR to enable RTS/CTS */
233 data = __raw_readw(SCPCR);
234 /* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
235 __raw_writew(data & 0x0fcf, SCPCR);
237 if (!(cflag & CRTSCTS)) {
238 /* We need to set SCPCR to enable RTS/CTS */
239 data = __raw_readw(SCPCR);
240 /* Clear out SCP7MD1,0, SCP4MD1,0,
241 Set SCP6MD1,0 = {01} (output) */
242 __raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
244 data = ctrl_inb(SCPDR);
245 /* Set /RTS2 (bit6) = 0 */
246 ctrl_outb(data & 0xbf, SCPDR);
249 #elif defined(CONFIG_CPU_SUBTYPE_SH7722)
250 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
254 if (port->mapbase == 0xffe00000) {
255 data = __raw_readw(PSCR);
257 if (!(cflag & CRTSCTS))
260 __raw_writew(data, PSCR);
263 #elif defined(CONFIG_CPU_SUBTYPE_SH7763) || \
264 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
265 defined(CONFIG_CPU_SUBTYPE_SH7785) || \
266 defined(CONFIG_CPU_SUBTYPE_SHX3)
267 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
269 if (!(cflag & CRTSCTS))
270 __raw_writew(0x0080, SCSPTR0); /* Set RTS = 1 */
272 #elif defined(CONFIG_CPU_SH4) && !defined(CONFIG_CPU_SH4A)
273 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
275 if (!(cflag & CRTSCTS))
276 __raw_writew(0x0080, SCSPTR2); /* Set RTS = 1 */
279 static inline void sci_init_pins(struct uart_port *port, unsigned int cflag)
285 #if defined(CONFIG_CPU_SUBTYPE_SH7760) || \
286 defined(CONFIG_CPU_SUBTYPE_SH7780) || \
287 defined(CONFIG_CPU_SUBTYPE_SH7785)
288 static inline int scif_txroom(struct uart_port *port)
290 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
293 static inline int scif_rxroom(struct uart_port *port)
295 return sci_in(port, SCRFDR) & 0xff;
297 #elif defined(CONFIG_CPU_SUBTYPE_SH7763)
298 static inline int scif_txroom(struct uart_port *port)
300 if ((port->mapbase == 0xffe00000) ||
301 (port->mapbase == 0xffe08000)) {
303 return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
306 return SCIF2_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
310 static inline int scif_rxroom(struct uart_port *port)
312 if ((port->mapbase == 0xffe00000) ||
313 (port->mapbase == 0xffe08000)) {
315 return sci_in(port, SCRFDR) & 0xff;
318 return sci_in(port, SCFDR) & SCIF2_RFDC_MASK;
322 static inline int scif_txroom(struct uart_port *port)
324 return SCIF_TXROOM_MAX - (sci_in(port, SCFDR) >> 8);
327 static inline int scif_rxroom(struct uart_port *port)
329 return sci_in(port, SCFDR) & SCIF_RFDC_MASK;
333 static inline int sci_txroom(struct uart_port *port)
335 return (sci_in(port, SCxSR) & SCI_TDRE) != 0;
338 static inline int sci_rxroom(struct uart_port *port)
340 return (sci_in(port, SCxSR) & SCxSR_RDxF(port)) != 0;
343 /* ********************************************************************** *
344 * the interrupt related routines *
345 * ********************************************************************** */
347 static void sci_transmit_chars(struct uart_port *port)
349 struct circ_buf *xmit = &port->info->xmit;
350 unsigned int stopped = uart_tx_stopped(port);
351 unsigned short status;
355 status = sci_in(port, SCxSR);
356 if (!(status & SCxSR_TDxE(port))) {
357 ctrl = sci_in(port, SCSCR);
358 if (uart_circ_empty(xmit))
359 ctrl &= ~SCI_CTRL_FLAGS_TIE;
361 ctrl |= SCI_CTRL_FLAGS_TIE;
362 sci_out(port, SCSCR, ctrl);
366 if (port->type == PORT_SCI)
367 count = sci_txroom(port);
369 count = scif_txroom(port);
377 } else if (!uart_circ_empty(xmit) && !stopped) {
378 c = xmit->buf[xmit->tail];
379 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
384 sci_out(port, SCxTDR, c);
387 } while (--count > 0);
389 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
391 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
392 uart_write_wakeup(port);
393 if (uart_circ_empty(xmit)) {
396 ctrl = sci_in(port, SCSCR);
398 if (port->type != PORT_SCI) {
399 sci_in(port, SCxSR); /* Dummy read */
400 sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
403 ctrl |= SCI_CTRL_FLAGS_TIE;
404 sci_out(port, SCSCR, ctrl);
408 /* On SH3, SCIF may read end-of-break as a space->mark char */
409 #define STEPFN(c) ({int __c = (c); (((__c-1)|(__c)) == -1); })
411 static inline void sci_receive_chars(struct uart_port *port)
413 struct sci_port *sci_port = to_sci_port(port);
414 struct tty_struct *tty = port->info->port.tty;
415 int i, count, copied = 0;
416 unsigned short status;
419 status = sci_in(port, SCxSR);
420 if (!(status & SCxSR_RDxF(port)))
424 if (port->type == PORT_SCI)
425 count = sci_rxroom(port);
427 count = scif_rxroom(port);
429 /* Don't copy more bytes than there is room for in the buffer */
430 count = tty_buffer_request_room(tty, count);
432 /* If for any reason we can't copy more data, we're done! */
436 if (port->type == PORT_SCI) {
437 char c = sci_in(port, SCxRDR);
438 if (uart_handle_sysrq_char(port, c) ||
439 sci_port->break_flag)
442 tty_insert_flip_char(tty, c, TTY_NORMAL);
444 for (i = 0; i < count; i++) {
445 char c = sci_in(port, SCxRDR);
446 status = sci_in(port, SCxSR);
447 #if defined(CONFIG_CPU_SH3)
448 /* Skip "chars" during break */
449 if (sci_port->break_flag) {
451 (status & SCxSR_FER(port))) {
456 /* Nonzero => end-of-break */
457 dev_dbg(port->dev, "debounce<%02x>\n", c);
458 sci_port->break_flag = 0;
465 #endif /* CONFIG_CPU_SH3 */
466 if (uart_handle_sysrq_char(port, c)) {
471 /* Store data and status */
472 if (status&SCxSR_FER(port)) {
474 dev_notice(port->dev, "frame error\n");
475 } else if (status&SCxSR_PER(port)) {
477 dev_notice(port->dev, "parity error\n");
481 tty_insert_flip_char(tty, c, flag);
485 sci_in(port, SCxSR); /* dummy read */
486 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
489 port->icount.rx += count;
493 /* Tell the rest of the system the news. New characters! */
494 tty_flip_buffer_push(tty);
496 sci_in(port, SCxSR); /* dummy read */
497 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
501 #define SCI_BREAK_JIFFIES (HZ/20)
502 /* The sci generates interrupts during the break,
503 * 1 per millisecond or so during the break period, for 9600 baud.
504 * So dont bother disabling interrupts.
505 * But dont want more than 1 break event.
506 * Use a kernel timer to periodically poll the rx line until
507 * the break is finished.
509 static void sci_schedule_break_timer(struct sci_port *port)
511 port->break_timer.expires = jiffies + SCI_BREAK_JIFFIES;
512 add_timer(&port->break_timer);
514 /* Ensure that two consecutive samples find the break over. */
515 static void sci_break_timer(unsigned long data)
517 struct sci_port *port = (struct sci_port *)data;
519 if (sci_rxd_in(&port->port) == 0) {
520 port->break_flag = 1;
521 sci_schedule_break_timer(port);
522 } else if (port->break_flag == 1) {
524 port->break_flag = 2;
525 sci_schedule_break_timer(port);
527 port->break_flag = 0;
530 static inline int sci_handle_errors(struct uart_port *port)
533 unsigned short status = sci_in(port, SCxSR);
534 struct tty_struct *tty = port->info->port.tty;
536 if (status & SCxSR_ORER(port)) {
538 if (tty_insert_flip_char(tty, 0, TTY_OVERRUN))
541 dev_notice(port->dev, "overrun error");
544 if (status & SCxSR_FER(port)) {
545 if (sci_rxd_in(port) == 0) {
546 /* Notify of BREAK */
547 struct sci_port *sci_port = to_sci_port(port);
549 if (!sci_port->break_flag) {
550 sci_port->break_flag = 1;
551 sci_schedule_break_timer(sci_port);
553 /* Do sysrq handling. */
554 if (uart_handle_break(port))
557 dev_dbg(port->dev, "BREAK detected\n");
559 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
565 if (tty_insert_flip_char(tty, 0, TTY_FRAME))
568 dev_notice(port->dev, "frame error\n");
572 if (status & SCxSR_PER(port)) {
574 if (tty_insert_flip_char(tty, 0, TTY_PARITY))
577 dev_notice(port->dev, "parity error");
581 tty_flip_buffer_push(tty);
586 static inline int sci_handle_fifo_overrun(struct uart_port *port)
588 struct tty_struct *tty = port->info->port.tty;
591 if (port->type != PORT_SCIF)
594 if ((sci_in(port, SCLSR) & SCIF_ORER) != 0) {
595 sci_out(port, SCLSR, 0);
597 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
598 tty_flip_buffer_push(tty);
600 dev_notice(port->dev, "overrun error\n");
607 static inline int sci_handle_breaks(struct uart_port *port)
610 unsigned short status = sci_in(port, SCxSR);
611 struct tty_struct *tty = port->info->port.tty;
612 struct sci_port *s = &sci_ports[port->line];
614 if (uart_handle_break(port))
617 if (!s->break_flag && status & SCxSR_BRK(port)) {
618 #if defined(CONFIG_CPU_SH3)
622 /* Notify of BREAK */
623 if (tty_insert_flip_char(tty, 0, TTY_BREAK))
626 dev_dbg(port->dev, "BREAK detected\n");
630 tty_flip_buffer_push(tty);
632 copied += sci_handle_fifo_overrun(port);
637 static irqreturn_t sci_rx_interrupt(int irq, void *port)
639 /* I think sci_receive_chars has to be called irrespective
640 * of whether the I_IXOFF is set, otherwise, how is the interrupt
643 sci_receive_chars(port);
648 static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
650 struct uart_port *port = ptr;
652 spin_lock_irq(&port->lock);
653 sci_transmit_chars(port);
654 spin_unlock_irq(&port->lock);
659 static irqreturn_t sci_er_interrupt(int irq, void *ptr)
661 struct uart_port *port = ptr;
664 if (port->type == PORT_SCI) {
665 if (sci_handle_errors(port)) {
666 /* discard character in rx buffer */
668 sci_out(port, SCxSR, SCxSR_RDxF_CLEAR(port));
671 sci_handle_fifo_overrun(port);
672 sci_rx_interrupt(irq, ptr);
675 sci_out(port, SCxSR, SCxSR_ERROR_CLEAR(port));
677 /* Kick the transmission */
678 sci_tx_interrupt(irq, ptr);
683 static irqreturn_t sci_br_interrupt(int irq, void *ptr)
685 struct uart_port *port = ptr;
688 sci_handle_breaks(port);
689 sci_out(port, SCxSR, SCxSR_BREAK_CLEAR(port));
694 static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
696 unsigned short ssr_status, scr_status;
697 struct uart_port *port = ptr;
698 irqreturn_t ret = IRQ_NONE;
700 ssr_status = sci_in(port, SCxSR);
701 scr_status = sci_in(port, SCSCR);
704 if ((ssr_status & 0x0020) && (scr_status & SCI_CTRL_FLAGS_TIE))
705 ret = sci_tx_interrupt(irq, ptr);
707 if ((ssr_status & 0x0002) && (scr_status & SCI_CTRL_FLAGS_RIE))
708 ret = sci_rx_interrupt(irq, ptr);
709 /* Error Interrupt */
710 if ((ssr_status & 0x0080) && (scr_status & SCI_CTRL_FLAGS_REIE))
711 ret = sci_er_interrupt(irq, ptr);
712 /* Break Interrupt */
713 if ((ssr_status & 0x0010) && (scr_status & SCI_CTRL_FLAGS_REIE))
714 ret = sci_br_interrupt(irq, ptr);
719 #ifdef CONFIG_HAVE_CLK
721 * Here we define a transistion notifier so that we can update all of our
722 * ports' baud rate when the peripheral clock changes.
724 static int sci_notifier(struct notifier_block *self,
725 unsigned long phase, void *p)
729 if ((phase == CPUFREQ_POSTCHANGE) ||
730 (phase == CPUFREQ_RESUMECHANGE))
731 for (i = 0; i < SCI_NPORTS; i++) {
732 struct sci_port *s = &sci_ports[i];
733 s->port.uartclk = clk_get_rate(s->clk);
739 static struct notifier_block sci_nb = { &sci_notifier, NULL, 0 };
742 static int sci_request_irq(struct sci_port *port)
745 irqreturn_t (*handlers[4])(int irq, void *ptr) = {
746 sci_er_interrupt, sci_rx_interrupt, sci_tx_interrupt,
749 const char *desc[] = { "SCI Receive Error", "SCI Receive Data Full",
750 "SCI Transmit Data Empty", "SCI Break" };
752 if (port->irqs[0] == port->irqs[1]) {
753 if (unlikely(!port->irqs[0]))
756 if (request_irq(port->irqs[0], sci_mpxed_interrupt,
757 IRQF_DISABLED, "sci", port)) {
758 dev_err(port->port.dev, "Can't allocate IRQ\n");
762 for (i = 0; i < ARRAY_SIZE(handlers); i++) {
763 if (unlikely(!port->irqs[i]))
766 if (request_irq(port->irqs[i], handlers[i],
767 IRQF_DISABLED, desc[i], port)) {
768 dev_err(port->port.dev, "Can't allocate IRQ\n");
777 static void sci_free_irq(struct sci_port *port)
781 if (port->irqs[0] == port->irqs[1])
782 free_irq(port->irqs[0], port);
784 for (i = 0; i < ARRAY_SIZE(port->irqs); i++) {
788 free_irq(port->irqs[i], port);
793 static unsigned int sci_tx_empty(struct uart_port *port)
799 static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)
801 /* This routine is used for seting signals of: DTR, DCD, CTS/RTS */
802 /* We use SCIF's hardware for CTS/RTS, so don't need any for that. */
803 /* If you have signals for DTR and DCD, please implement here. */
806 static unsigned int sci_get_mctrl(struct uart_port *port)
808 /* This routine is used for geting signals of: DTR, DCD, DSR, RI,
811 return TIOCM_DTR | TIOCM_RTS | TIOCM_DSR;
814 static void sci_start_tx(struct uart_port *port)
818 /* Set TIE (Transmit Interrupt Enable) bit in SCSCR */
819 ctrl = sci_in(port, SCSCR);
820 ctrl |= SCI_CTRL_FLAGS_TIE;
821 sci_out(port, SCSCR, ctrl);
824 static void sci_stop_tx(struct uart_port *port)
828 /* Clear TIE (Transmit Interrupt Enable) bit in SCSCR */
829 ctrl = sci_in(port, SCSCR);
830 ctrl &= ~SCI_CTRL_FLAGS_TIE;
831 sci_out(port, SCSCR, ctrl);
834 static void sci_start_rx(struct uart_port *port, unsigned int tty_start)
838 /* Set RIE (Receive Interrupt Enable) bit in SCSCR */
839 ctrl = sci_in(port, SCSCR);
840 ctrl |= SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE;
841 sci_out(port, SCSCR, ctrl);
844 static void sci_stop_rx(struct uart_port *port)
848 /* Clear RIE (Receive Interrupt Enable) bit in SCSCR */
849 ctrl = sci_in(port, SCSCR);
850 ctrl &= ~(SCI_CTRL_FLAGS_RIE | SCI_CTRL_FLAGS_REIE);
851 sci_out(port, SCSCR, ctrl);
854 static void sci_enable_ms(struct uart_port *port)
856 /* Nothing here yet .. */
859 static void sci_break_ctl(struct uart_port *port, int break_state)
861 /* Nothing here yet .. */
864 static int sci_startup(struct uart_port *port)
866 struct sci_port *s = &sci_ports[port->line];
871 #ifdef CONFIG_HAVE_CLK
872 s->clk = clk_get(NULL, "module_clk");
877 sci_start_rx(port, 1);
882 static void sci_shutdown(struct uart_port *port)
884 struct sci_port *s = &sci_ports[port->line];
893 #ifdef CONFIG_HAVE_CLK
899 static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
900 struct ktermios *old)
902 unsigned int status, baud, smr_val;
905 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
907 t = SCBRR_VALUE(baud, port->uartclk);
910 status = sci_in(port, SCxSR);
911 } while (!(status & SCxSR_TEND(port)));
913 sci_out(port, SCSCR, 0x00); /* TE=0, RE=0, CKE1=0 */
915 if (port->type != PORT_SCI)
916 sci_out(port, SCFCR, SCFCR_RFRST | SCFCR_TFRST);
918 smr_val = sci_in(port, SCSMR) & 3;
919 if ((termios->c_cflag & CSIZE) == CS7)
921 if (termios->c_cflag & PARENB)
923 if (termios->c_cflag & PARODD)
925 if (termios->c_cflag & CSTOPB)
928 uart_update_timeout(port, termios->c_cflag, baud);
930 sci_out(port, SCSMR, smr_val);
934 sci_out(port, SCSMR, (sci_in(port, SCSMR) & ~3) | 1);
937 sci_out(port, SCSMR, sci_in(port, SCSMR) & ~3);
939 sci_out(port, SCBRR, t);
940 udelay((1000000+(baud-1)) / baud); /* Wait one bit interval */
943 sci_init_pins(port, termios->c_cflag);
944 sci_out(port, SCFCR, (termios->c_cflag & CRTSCTS) ? SCFCR_MCE : 0);
946 sci_out(port, SCSCR, SCSCR_INIT(port));
948 if ((termios->c_cflag & CREAD) != 0)
949 sci_start_rx(port, 0);
952 static const char *sci_type(struct uart_port *port)
954 switch (port->type) {
968 static void sci_release_port(struct uart_port *port)
970 /* Nothing here yet .. */
973 static int sci_request_port(struct uart_port *port)
975 /* Nothing here yet .. */
979 static void sci_config_port(struct uart_port *port, int flags)
981 struct sci_port *s = &sci_ports[port->line];
983 port->type = s->type;
985 if (port->flags & UPF_IOREMAP && !port->membase) {
986 #if defined(CONFIG_SUPERH64)
987 port->mapbase = onchip_remap(SCIF_ADDR_SH5, 1024, "SCIF");
988 port->membase = (void __iomem *)port->mapbase;
990 port->membase = ioremap_nocache(port->mapbase, 0x40);
993 dev_err(port->dev, "can't remap port#%d\n", port->line);
997 static int sci_verify_port(struct uart_port *port, struct serial_struct *ser)
999 struct sci_port *s = &sci_ports[port->line];
1001 if (ser->irq != s->irqs[SCIx_TXI_IRQ] || ser->irq > nr_irqs)
1003 if (ser->baud_base < 2400)
1004 /* No paper tape reader for Mitch.. */
1010 static struct uart_ops sci_uart_ops = {
1011 .tx_empty = sci_tx_empty,
1012 .set_mctrl = sci_set_mctrl,
1013 .get_mctrl = sci_get_mctrl,
1014 .start_tx = sci_start_tx,
1015 .stop_tx = sci_stop_tx,
1016 .stop_rx = sci_stop_rx,
1017 .enable_ms = sci_enable_ms,
1018 .break_ctl = sci_break_ctl,
1019 .startup = sci_startup,
1020 .shutdown = sci_shutdown,
1021 .set_termios = sci_set_termios,
1023 .release_port = sci_release_port,
1024 .request_port = sci_request_port,
1025 .config_port = sci_config_port,
1026 .verify_port = sci_verify_port,
1027 #ifdef CONFIG_CONSOLE_POLL
1028 .poll_get_char = sci_poll_get_char,
1029 .poll_put_char = sci_poll_put_char,
1033 static void __init sci_init_ports(void)
1035 static int first = 1;
1043 for (i = 0; i < SCI_NPORTS; i++) {
1044 sci_ports[i].port.ops = &sci_uart_ops;
1045 sci_ports[i].port.iotype = UPIO_MEM;
1046 sci_ports[i].port.line = i;
1047 sci_ports[i].port.fifosize = 1;
1049 #if defined(__H8300H__) || defined(__H8300S__)
1051 sci_ports[i].enable = h8300_sci_enable;
1052 sci_ports[i].disable = h8300_sci_disable;
1054 sci_ports[i].port.uartclk = CONFIG_CPU_CLOCK;
1055 #elif defined(CONFIG_HAVE_CLK)
1057 * XXX: We should use a proper SCI/SCIF clock
1060 struct clk *clk = clk_get(NULL, "module_clk");
1061 sci_ports[i].port.uartclk = clk_get_rate(clk);
1065 #error "Need a valid uartclk"
1068 sci_ports[i].break_timer.data = (unsigned long)&sci_ports[i];
1069 sci_ports[i].break_timer.function = sci_break_timer;
1071 init_timer(&sci_ports[i].break_timer);
1075 int __init early_sci_setup(struct uart_port *port)
1077 if (unlikely(port->line > SCI_NPORTS))
1082 sci_ports[port->line].port.membase = port->membase;
1083 sci_ports[port->line].port.mapbase = port->mapbase;
1084 sci_ports[port->line].port.type = port->type;
1089 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
1091 * Print a string to the serial port trying not to disturb
1092 * any possible real use of the port...
1094 static void serial_console_write(struct console *co, const char *s,
1097 struct uart_port *port = &serial_console_port->port;
1100 for (i = 0; i < count; i++) {
1102 sci_poll_put_char(port, '\r');
1104 sci_poll_put_char(port, *s++);
1108 static int __init serial_console_setup(struct console *co, char *options)
1110 struct uart_port *port;
1118 * Check whether an invalid uart number has been specified, and
1119 * if so, search for the first available port that does have
1122 if (co->index >= SCI_NPORTS)
1125 serial_console_port = &sci_ports[co->index];
1126 port = &serial_console_port->port;
1129 * Also need to check port->type, we don't actually have any
1130 * UPIO_PORT ports, but uart_report_port() handily misreports
1131 * it anyways if we don't have a port available by the time this is
1136 if (!port->membase || !port->mapbase)
1139 port->type = serial_console_port->type;
1141 #ifdef CONFIG_HAVE_CLK
1142 if (!serial_console_port->clk)
1143 serial_console_port->clk = clk_get(NULL, "module_clk");
1146 if (port->flags & UPF_IOREMAP)
1147 sci_config_port(port, 0);
1149 if (serial_console_port->enable)
1150 serial_console_port->enable(port);
1153 uart_parse_options(options, &baud, &parity, &bits, &flow);
1155 ret = uart_set_options(port, co, baud, parity, bits, flow);
1156 #if defined(__H8300H__) || defined(__H8300S__)
1157 /* disable rx interrupt */
1164 static struct console serial_console = {
1166 .device = uart_console_device,
1167 .write = serial_console_write,
1168 .setup = serial_console_setup,
1169 .flags = CON_PRINTBUFFER,
1171 .data = &sci_uart_driver,
1174 static int __init sci_console_init(void)
1177 register_console(&serial_console);
1180 console_initcall(sci_console_init);
1181 #endif /* CONFIG_SERIAL_SH_SCI_CONSOLE */
1183 #if defined(CONFIG_SERIAL_SH_SCI_CONSOLE)
1184 #define SCI_CONSOLE (&serial_console)
1186 #define SCI_CONSOLE 0
1189 static char banner[] __initdata =
1190 KERN_INFO "SuperH SCI(F) driver initialized\n";
1192 static struct uart_driver sci_uart_driver = {
1193 .owner = THIS_MODULE,
1194 .driver_name = "sci",
1195 .dev_name = "ttySC",
1197 .minor = SCI_MINOR_START,
1199 .cons = SCI_CONSOLE,
1203 * Register a set of serial devices attached to a platform device. The
1204 * list is terminated with a zero flags entry, which means we expect
1205 * all entries to have at least UPF_BOOT_AUTOCONF set. Platforms that need
1206 * remapping (such as sh64) should also set UPF_IOREMAP.
1208 static int __devinit sci_probe(struct platform_device *dev)
1210 struct plat_sci_port *p = dev->dev.platform_data;
1211 int i, ret = -EINVAL;
1213 for (i = 0; p && p->flags != 0; p++, i++) {
1214 struct sci_port *sciport = &sci_ports[i];
1217 if (unlikely(i == SCI_NPORTS)) {
1218 dev_notice(&dev->dev, "Attempting to register port "
1219 "%d when only %d are available.\n",
1221 dev_notice(&dev->dev, "Consider bumping "
1222 "CONFIG_SERIAL_SH_SCI_NR_UARTS!\n");
1226 sciport->port.mapbase = p->mapbase;
1228 if (p->mapbase && !p->membase) {
1229 if (p->flags & UPF_IOREMAP) {
1230 p->membase = ioremap_nocache(p->mapbase, 0x40);
1231 if (IS_ERR(p->membase)) {
1232 ret = PTR_ERR(p->membase);
1237 * For the simple (and majority of) cases
1238 * where we don't need to do any remapping,
1239 * just cast the cookie directly.
1241 p->membase = (void __iomem *)p->mapbase;
1245 sciport->port.membase = p->membase;
1247 sciport->port.irq = p->irqs[SCIx_TXI_IRQ];
1248 sciport->port.flags = p->flags;
1249 sciport->port.dev = &dev->dev;
1251 sciport->type = sciport->port.type = p->type;
1253 memcpy(&sciport->irqs, &p->irqs, sizeof(p->irqs));
1255 uart_add_one_port(&sci_uart_driver, &sciport->port);
1258 #ifdef CONFIG_HAVE_CLK
1259 cpufreq_register_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1262 #ifdef CONFIG_SH_STANDARD_BIOS
1263 sh_bios_gdb_detach();
1269 for (i = i - 1; i >= 0; i--)
1270 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1275 static int __devexit sci_remove(struct platform_device *dev)
1279 #ifdef CONFIG_HAVE_CLK
1280 cpufreq_unregister_notifier(&sci_nb, CPUFREQ_TRANSITION_NOTIFIER);
1283 for (i = 0; i < SCI_NPORTS; i++)
1284 uart_remove_one_port(&sci_uart_driver, &sci_ports[i].port);
1289 static int sci_suspend(struct platform_device *dev, pm_message_t state)
1293 for (i = 0; i < SCI_NPORTS; i++) {
1294 struct sci_port *p = &sci_ports[i];
1296 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1297 uart_suspend_port(&sci_uart_driver, &p->port);
1303 static int sci_resume(struct platform_device *dev)
1307 for (i = 0; i < SCI_NPORTS; i++) {
1308 struct sci_port *p = &sci_ports[i];
1310 if (p->type != PORT_UNKNOWN && p->port.dev == &dev->dev)
1311 uart_resume_port(&sci_uart_driver, &p->port);
1317 static struct platform_driver sci_driver = {
1319 .remove = __devexit_p(sci_remove),
1320 .suspend = sci_suspend,
1321 .resume = sci_resume,
1324 .owner = THIS_MODULE,
1328 static int __init sci_init(void)
1336 ret = uart_register_driver(&sci_uart_driver);
1337 if (likely(ret == 0)) {
1338 ret = platform_driver_register(&sci_driver);
1340 uart_unregister_driver(&sci_uart_driver);
1346 static void __exit sci_exit(void)
1348 platform_driver_unregister(&sci_driver);
1349 uart_unregister_driver(&sci_uart_driver);
1352 module_init(sci_init);
1353 module_exit(sci_exit);
1355 MODULE_LICENSE("GPL");
1356 MODULE_ALIAS("platform:sh-sci");