1 /* $Id: su.c,v 1.55 2002/01/08 16:00:16 davem Exp $
2 * su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
4 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1998-1999 Pete Zaitcev (zaitcev@yahoo.com)
7 * This is mainly a variation of 8250.c, credits go to authors mentioned
8 * therein. In fact this driver should be merged into the generic 8250.c
9 * infrastructure perhaps using a 8250_sparc.c module.
11 * Fixed to use tty_get_baud_rate().
12 * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
14 * Converted to new 2.5.x UART layer.
15 * David S. Miller (davem@davemloft.net), 2002-Jul-29
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/spinlock.h>
22 #include <linux/errno.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/major.h>
26 #include <linux/string.h>
27 #include <linux/ptrace.h>
28 #include <linux/ioport.h>
29 #include <linux/circ_buf.h>
30 #include <linux/serial.h>
31 #include <linux/sysrq.h>
32 #include <linux/console.h>
34 #include <linux/serio.h>
36 #include <linux/serial_reg.h>
37 #include <linux/init.h>
38 #include <linux/delay.h>
43 #include <asm/of_device.h>
45 #if defined(CONFIG_SERIAL_SUNSU_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
49 #include <linux/serial_core.h>
53 /* We are on a NS PC87303 clocked with 24.0 MHz, which results
54 * in a UART clock of 1.8462 MHz.
56 #define SU_BASE_BAUD (1846200 / 16)
58 enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
59 static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
62 * Here we define the default xmit fifo size used for each type of UART.
64 static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
69 { "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
71 { "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
72 { "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
73 { "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO },
75 { "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO },
76 { "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
77 { "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
78 { "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO }
81 struct uart_sunsu_port {
82 struct uart_port port;
87 unsigned int lsr_break_flag;
90 /* Probing information. */
92 unsigned int type_probed; /* XXX Stupid */
93 unsigned long reg_size;
101 static unsigned int serial_in(struct uart_sunsu_port *up, int offset)
103 offset <<= up->port.regshift;
105 switch (up->port.iotype) {
107 outb(up->port.hub6 - 1 + offset, up->port.iobase);
108 return inb(up->port.iobase + 1);
111 return readb(up->port.membase + offset);
114 return inb(up->port.iobase + offset);
118 static void serial_out(struct uart_sunsu_port *up, int offset, int value)
120 #ifndef CONFIG_SPARC64
122 * MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
123 * connected with a gate then go to SlavIO. When IRQ4 goes tristated
124 * gate outputs a logical one. Since we use level triggered interrupts
125 * we have lockup and watchdog reset. We cannot mask IRQ because
126 * keyboard shares IRQ with us (Word has it as Bob Smelik's design).
127 * This problem is similar to what Alpha people suffer, see serial.c.
129 if (offset == UART_MCR)
130 value |= UART_MCR_OUT2;
132 offset <<= up->port.regshift;
134 switch (up->port.iotype) {
136 outb(up->port.hub6 - 1 + offset, up->port.iobase);
137 outb(value, up->port.iobase + 1);
141 writeb(value, up->port.membase + offset);
145 outb(value, up->port.iobase + offset);
150 * We used to support using pause I/O for certain machines. We
151 * haven't supported this for a while, but just in case it's badly
152 * needed for certain old 386 machines, I've left these #define's
155 #define serial_inp(up, offset) serial_in(up, offset)
156 #define serial_outp(up, offset, value) serial_out(up, offset, value)
162 static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
164 serial_out(up, UART_SCR, offset);
165 serial_out(up, UART_ICR, value);
168 #if 0 /* Unused currently */
169 static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
173 serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
174 serial_out(up, UART_SCR, offset);
175 value = serial_in(up, UART_ICR);
176 serial_icr_write(up, UART_ACR, up->acr);
182 #ifdef CONFIG_SERIAL_8250_RSA
184 * Attempts to turn on the RSA FIFO. Returns zero on failure.
185 * We set the port uart clock rate if we succeed.
187 static int __enable_rsa(struct uart_sunsu_port *up)
192 mode = serial_inp(up, UART_RSA_MSR);
193 result = mode & UART_RSA_MSR_FIFO;
196 serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
197 mode = serial_inp(up, UART_RSA_MSR);
198 result = mode & UART_RSA_MSR_FIFO;
202 up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
207 static void enable_rsa(struct uart_sunsu_port *up)
209 if (up->port.type == PORT_RSA) {
210 if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
211 spin_lock_irq(&up->port.lock);
213 spin_unlock_irq(&up->port.lock);
215 if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
216 serial_outp(up, UART_RSA_FRR, 0);
221 * Attempts to turn off the RSA FIFO. Returns zero on failure.
222 * It is unknown why interrupts were disabled in here. However,
223 * the caller is expected to preserve this behaviour by grabbing
224 * the spinlock before calling this function.
226 static void disable_rsa(struct uart_sunsu_port *up)
231 if (up->port.type == PORT_RSA &&
232 up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
233 spin_lock_irq(&up->port.lock);
235 mode = serial_inp(up, UART_RSA_MSR);
236 result = !(mode & UART_RSA_MSR_FIFO);
239 serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
240 mode = serial_inp(up, UART_RSA_MSR);
241 result = !(mode & UART_RSA_MSR_FIFO);
245 up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
246 spin_unlock_irq(&up->port.lock);
249 #endif /* CONFIG_SERIAL_8250_RSA */
251 static inline void __stop_tx(struct uart_sunsu_port *p)
253 if (p->ier & UART_IER_THRI) {
254 p->ier &= ~UART_IER_THRI;
255 serial_out(p, UART_IER, p->ier);
259 static void sunsu_stop_tx(struct uart_port *port)
261 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
266 * We really want to stop the transmitter from sending.
268 if (up->port.type == PORT_16C950) {
269 up->acr |= UART_ACR_TXDIS;
270 serial_icr_write(up, UART_ACR, up->acr);
274 static void sunsu_start_tx(struct uart_port *port)
276 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
278 if (!(up->ier & UART_IER_THRI)) {
279 up->ier |= UART_IER_THRI;
280 serial_out(up, UART_IER, up->ier);
284 * Re-enable the transmitter if we disabled it.
286 if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
287 up->acr &= ~UART_ACR_TXDIS;
288 serial_icr_write(up, UART_ACR, up->acr);
292 static void sunsu_stop_rx(struct uart_port *port)
294 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
296 up->ier &= ~UART_IER_RLSI;
297 up->port.read_status_mask &= ~UART_LSR_DR;
298 serial_out(up, UART_IER, up->ier);
301 static void sunsu_enable_ms(struct uart_port *port)
303 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
306 spin_lock_irqsave(&up->port.lock, flags);
307 up->ier |= UART_IER_MSI;
308 serial_out(up, UART_IER, up->ier);
309 spin_unlock_irqrestore(&up->port.lock, flags);
312 static struct tty_struct *
313 receive_chars(struct uart_sunsu_port *up, unsigned char *status)
315 struct tty_struct *tty = up->port.info->tty;
316 unsigned char ch, flag;
318 int saw_console_brk = 0;
321 ch = serial_inp(up, UART_RX);
323 up->port.icount.rx++;
325 if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
326 UART_LSR_FE | UART_LSR_OE))) {
328 * For statistics only
330 if (*status & UART_LSR_BI) {
331 *status &= ~(UART_LSR_FE | UART_LSR_PE);
332 up->port.icount.brk++;
333 if (up->port.cons != NULL &&
334 up->port.line == up->port.cons->index)
337 * We do the SysRQ and SAK checking
338 * here because otherwise the break
339 * may get masked by ignore_status_mask
340 * or read_status_mask.
342 if (uart_handle_break(&up->port))
344 } else if (*status & UART_LSR_PE)
345 up->port.icount.parity++;
346 else if (*status & UART_LSR_FE)
347 up->port.icount.frame++;
348 if (*status & UART_LSR_OE)
349 up->port.icount.overrun++;
352 * Mask off conditions which should be ingored.
354 *status &= up->port.read_status_mask;
356 if (up->port.cons != NULL &&
357 up->port.line == up->port.cons->index) {
358 /* Recover the break flag from console xmit */
359 *status |= up->lsr_break_flag;
360 up->lsr_break_flag = 0;
363 if (*status & UART_LSR_BI) {
365 } else if (*status & UART_LSR_PE)
367 else if (*status & UART_LSR_FE)
370 if (uart_handle_sysrq_char(&up->port, ch))
372 if ((*status & up->port.ignore_status_mask) == 0)
373 tty_insert_flip_char(tty, ch, flag);
374 if (*status & UART_LSR_OE)
376 * Overrun is special, since it's reported
377 * immediately, and doesn't affect the current
380 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
382 *status = serial_inp(up, UART_LSR);
383 } while ((*status & UART_LSR_DR) && (max_count-- > 0));
391 static void transmit_chars(struct uart_sunsu_port *up)
393 struct circ_buf *xmit = &up->port.info->xmit;
396 if (up->port.x_char) {
397 serial_outp(up, UART_TX, up->port.x_char);
398 up->port.icount.tx++;
402 if (uart_tx_stopped(&up->port)) {
403 sunsu_stop_tx(&up->port);
406 if (uart_circ_empty(xmit)) {
411 count = up->port.fifosize;
413 serial_out(up, UART_TX, xmit->buf[xmit->tail]);
414 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
415 up->port.icount.tx++;
416 if (uart_circ_empty(xmit))
418 } while (--count > 0);
420 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
421 uart_write_wakeup(&up->port);
423 if (uart_circ_empty(xmit))
427 static void check_modem_status(struct uart_sunsu_port *up)
431 status = serial_in(up, UART_MSR);
433 if ((status & UART_MSR_ANY_DELTA) == 0)
436 if (status & UART_MSR_TERI)
437 up->port.icount.rng++;
438 if (status & UART_MSR_DDSR)
439 up->port.icount.dsr++;
440 if (status & UART_MSR_DDCD)
441 uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
442 if (status & UART_MSR_DCTS)
443 uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
445 wake_up_interruptible(&up->port.info->delta_msr_wait);
448 static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id)
450 struct uart_sunsu_port *up = dev_id;
452 unsigned char status;
454 spin_lock_irqsave(&up->port.lock, flags);
457 struct tty_struct *tty;
459 status = serial_inp(up, UART_LSR);
461 if (status & UART_LSR_DR)
462 tty = receive_chars(up, &status);
463 check_modem_status(up);
464 if (status & UART_LSR_THRE)
467 spin_unlock_irqrestore(&up->port.lock, flags);
470 tty_flip_buffer_push(tty);
472 spin_lock_irqsave(&up->port.lock, flags);
474 } while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
476 spin_unlock_irqrestore(&up->port.lock, flags);
481 /* Separate interrupt handling path for keyboard/mouse ports. */
484 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
485 unsigned int iflag, unsigned int quot);
487 static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
489 unsigned int cur_cflag = up->cflag;
493 up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
495 quot = up->port.uartclk / (16 * new_baud);
497 sunsu_change_speed(&up->port, up->cflag, 0, quot);
500 static void receive_kbd_ms_chars(struct uart_sunsu_port *up, int is_break)
503 unsigned char ch = serial_inp(up, UART_RX);
505 /* Stop-A is handled by drivers/char/keyboard.c now. */
506 if (up->su_type == SU_PORT_KBD) {
508 serio_interrupt(&up->serio, ch, 0);
510 } else if (up->su_type == SU_PORT_MS) {
511 int ret = suncore_mouse_baud_detection(ch, is_break);
515 sunsu_change_mouse_baud(up);
522 serio_interrupt(&up->serio, ch, 0);
527 } while (serial_in(up, UART_LSR) & UART_LSR_DR);
530 static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id)
532 struct uart_sunsu_port *up = dev_id;
534 if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
535 unsigned char status = serial_inp(up, UART_LSR);
537 if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
538 receive_kbd_ms_chars(up, (status & UART_LSR_BI) != 0);
544 static unsigned int sunsu_tx_empty(struct uart_port *port)
546 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
550 spin_lock_irqsave(&up->port.lock, flags);
551 ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
552 spin_unlock_irqrestore(&up->port.lock, flags);
557 static unsigned int sunsu_get_mctrl(struct uart_port *port)
559 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
560 unsigned char status;
563 status = serial_in(up, UART_MSR);
566 if (status & UART_MSR_DCD)
568 if (status & UART_MSR_RI)
570 if (status & UART_MSR_DSR)
572 if (status & UART_MSR_CTS)
577 static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
579 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
580 unsigned char mcr = 0;
582 if (mctrl & TIOCM_RTS)
584 if (mctrl & TIOCM_DTR)
586 if (mctrl & TIOCM_OUT1)
587 mcr |= UART_MCR_OUT1;
588 if (mctrl & TIOCM_OUT2)
589 mcr |= UART_MCR_OUT2;
590 if (mctrl & TIOCM_LOOP)
591 mcr |= UART_MCR_LOOP;
593 serial_out(up, UART_MCR, mcr);
596 static void sunsu_break_ctl(struct uart_port *port, int break_state)
598 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
601 spin_lock_irqsave(&up->port.lock, flags);
602 if (break_state == -1)
603 up->lcr |= UART_LCR_SBC;
605 up->lcr &= ~UART_LCR_SBC;
606 serial_out(up, UART_LCR, up->lcr);
607 spin_unlock_irqrestore(&up->port.lock, flags);
610 static int sunsu_startup(struct uart_port *port)
612 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
616 if (up->port.type == PORT_16C950) {
617 /* Wake up and initialize UART */
619 serial_outp(up, UART_LCR, 0xBF);
620 serial_outp(up, UART_EFR, UART_EFR_ECB);
621 serial_outp(up, UART_IER, 0);
622 serial_outp(up, UART_LCR, 0);
623 serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
624 serial_outp(up, UART_LCR, 0xBF);
625 serial_outp(up, UART_EFR, UART_EFR_ECB);
626 serial_outp(up, UART_LCR, 0);
629 #ifdef CONFIG_SERIAL_8250_RSA
631 * If this is an RSA port, see if we can kick it up to the
632 * higher speed clock.
638 * Clear the FIFO buffers and disable them.
639 * (they will be reenabled in set_termios())
641 if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
642 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
643 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
644 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
645 serial_outp(up, UART_FCR, 0);
649 * Clear the interrupt registers.
651 (void) serial_inp(up, UART_LSR);
652 (void) serial_inp(up, UART_RX);
653 (void) serial_inp(up, UART_IIR);
654 (void) serial_inp(up, UART_MSR);
657 * At this point, there's no way the LSR could still be 0xff;
658 * if it is, then bail out, because there's likely no UART
661 if (!(up->port.flags & UPF_BUGGY_UART) &&
662 (serial_inp(up, UART_LSR) == 0xff)) {
663 printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
667 if (up->su_type != SU_PORT_PORT) {
668 retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
669 IRQF_SHARED, su_typev[up->su_type], up);
671 retval = request_irq(up->port.irq, sunsu_serial_interrupt,
672 IRQF_SHARED, su_typev[up->su_type], up);
675 printk("su: Cannot register IRQ %d\n", up->port.irq);
680 * Now, initialize the UART
682 serial_outp(up, UART_LCR, UART_LCR_WLEN8);
684 spin_lock_irqsave(&up->port.lock, flags);
686 up->port.mctrl |= TIOCM_OUT2;
688 sunsu_set_mctrl(&up->port, up->port.mctrl);
689 spin_unlock_irqrestore(&up->port.lock, flags);
692 * Finally, enable interrupts. Note: Modem status interrupts
693 * are set via set_termios(), which will be occurring imminently
694 * anyway, so we don't enable them here.
696 up->ier = UART_IER_RLSI | UART_IER_RDI;
697 serial_outp(up, UART_IER, up->ier);
699 if (up->port.flags & UPF_FOURPORT) {
702 * Enable interrupts on the AST Fourport board
704 icp = (up->port.iobase & 0xfe0) | 0x01f;
710 * And clear the interrupt registers again for luck.
712 (void) serial_inp(up, UART_LSR);
713 (void) serial_inp(up, UART_RX);
714 (void) serial_inp(up, UART_IIR);
715 (void) serial_inp(up, UART_MSR);
720 static void sunsu_shutdown(struct uart_port *port)
722 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
726 * Disable interrupts from this port
729 serial_outp(up, UART_IER, 0);
731 spin_lock_irqsave(&up->port.lock, flags);
732 if (up->port.flags & UPF_FOURPORT) {
733 /* reset interrupts on the AST Fourport board */
734 inb((up->port.iobase & 0xfe0) | 0x1f);
735 up->port.mctrl |= TIOCM_OUT1;
737 up->port.mctrl &= ~TIOCM_OUT2;
739 sunsu_set_mctrl(&up->port, up->port.mctrl);
740 spin_unlock_irqrestore(&up->port.lock, flags);
743 * Disable break condition and FIFOs
745 serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
746 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
747 UART_FCR_CLEAR_RCVR |
748 UART_FCR_CLEAR_XMIT);
749 serial_outp(up, UART_FCR, 0);
751 #ifdef CONFIG_SERIAL_8250_RSA
753 * Reset the RSA board back to 115kbps compat mode.
759 * Read data port to reset things.
761 (void) serial_in(up, UART_RX);
763 free_irq(up->port.irq, up);
767 sunsu_change_speed(struct uart_port *port, unsigned int cflag,
768 unsigned int iflag, unsigned int quot)
770 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
771 unsigned char cval, fcr = 0;
774 switch (cflag & CSIZE) {
793 cval |= UART_LCR_PARITY;
794 if (!(cflag & PARODD))
795 cval |= UART_LCR_EPAR;
798 cval |= UART_LCR_SPAR;
802 * Work around a bug in the Oxford Semiconductor 952 rev B
803 * chip which causes it to seriously miscalculate baud rates
806 if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
810 if (uart_config[up->port.type].flags & UART_USE_FIFO) {
811 if ((up->port.uartclk / quot) < (2400 * 16))
812 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
813 #ifdef CONFIG_SERIAL_8250_RSA
814 else if (up->port.type == PORT_RSA)
815 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
818 fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
820 if (up->port.type == PORT_16750)
821 fcr |= UART_FCR7_64BYTE;
824 * Ok, we're now changing the port state. Do it with
825 * interrupts disabled.
827 spin_lock_irqsave(&up->port.lock, flags);
830 * Update the per-port timeout.
832 uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
834 up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
836 up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
837 if (iflag & (BRKINT | PARMRK))
838 up->port.read_status_mask |= UART_LSR_BI;
841 * Characteres to ignore
843 up->port.ignore_status_mask = 0;
845 up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
846 if (iflag & IGNBRK) {
847 up->port.ignore_status_mask |= UART_LSR_BI;
849 * If we're ignoring parity and break indicators,
850 * ignore overruns too (for real raw support).
853 up->port.ignore_status_mask |= UART_LSR_OE;
857 * ignore all characters if CREAD is not set
859 if ((cflag & CREAD) == 0)
860 up->port.ignore_status_mask |= UART_LSR_DR;
863 * CTS flow control flag and modem status interrupts
865 up->ier &= ~UART_IER_MSI;
866 if (UART_ENABLE_MS(&up->port, cflag))
867 up->ier |= UART_IER_MSI;
869 serial_out(up, UART_IER, up->ier);
871 if (uart_config[up->port.type].flags & UART_STARTECH) {
872 serial_outp(up, UART_LCR, 0xBF);
873 serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
875 serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
876 serial_outp(up, UART_DLL, quot & 0xff); /* LS of divisor */
877 serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */
878 if (up->port.type == PORT_16750)
879 serial_outp(up, UART_FCR, fcr); /* set fcr */
880 serial_outp(up, UART_LCR, cval); /* reset DLAB */
881 up->lcr = cval; /* Save LCR */
882 if (up->port.type != PORT_16750) {
883 if (fcr & UART_FCR_ENABLE_FIFO) {
884 /* emulated UARTs (Lucent Venus 167x) need two steps */
885 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
887 serial_outp(up, UART_FCR, fcr); /* set fcr */
892 spin_unlock_irqrestore(&up->port.lock, flags);
896 sunsu_set_termios(struct uart_port *port, struct ktermios *termios,
897 struct ktermios *old)
899 unsigned int baud, quot;
902 * Ask the core to calculate the divisor for us.
904 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
905 quot = uart_get_divisor(port, baud);
907 sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
910 static void sunsu_release_port(struct uart_port *port)
914 static int sunsu_request_port(struct uart_port *port)
919 static void sunsu_config_port(struct uart_port *port, int flags)
921 struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
923 if (flags & UART_CONFIG_TYPE) {
925 * We are supposed to call autoconfig here, but this requires
926 * splitting all the OBP probing crap from the UART probing.
927 * We'll do it when we kill sunsu.c altogether.
929 port->type = up->type_probed; /* XXX */
934 sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
940 sunsu_type(struct uart_port *port)
942 int type = port->type;
944 if (type >= ARRAY_SIZE(uart_config))
946 return uart_config[type].name;
949 static struct uart_ops sunsu_pops = {
950 .tx_empty = sunsu_tx_empty,
951 .set_mctrl = sunsu_set_mctrl,
952 .get_mctrl = sunsu_get_mctrl,
953 .stop_tx = sunsu_stop_tx,
954 .start_tx = sunsu_start_tx,
955 .stop_rx = sunsu_stop_rx,
956 .enable_ms = sunsu_enable_ms,
957 .break_ctl = sunsu_break_ctl,
958 .startup = sunsu_startup,
959 .shutdown = sunsu_shutdown,
960 .set_termios = sunsu_set_termios,
962 .release_port = sunsu_release_port,
963 .request_port = sunsu_request_port,
964 .config_port = sunsu_config_port,
965 .verify_port = sunsu_verify_port,
970 static struct uart_sunsu_port sunsu_ports[UART_NR];
974 static DEFINE_SPINLOCK(sunsu_serio_lock);
976 static int sunsu_serio_write(struct serio *serio, unsigned char ch)
978 struct uart_sunsu_port *up = serio->port_data;
982 spin_lock_irqsave(&sunsu_serio_lock, flags);
985 lsr = serial_in(up, UART_LSR);
986 } while (!(lsr & UART_LSR_THRE));
988 /* Send the character out. */
989 serial_out(up, UART_TX, ch);
991 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
996 static int sunsu_serio_open(struct serio *serio)
998 struct uart_sunsu_port *up = serio->port_data;
1002 spin_lock_irqsave(&sunsu_serio_lock, flags);
1003 if (!up->serio_open) {
1008 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1013 static void sunsu_serio_close(struct serio *serio)
1015 struct uart_sunsu_port *up = serio->port_data;
1016 unsigned long flags;
1018 spin_lock_irqsave(&sunsu_serio_lock, flags);
1020 spin_unlock_irqrestore(&sunsu_serio_lock, flags);
1023 #endif /* CONFIG_SERIO */
1025 static void sunsu_autoconfig(struct uart_sunsu_port *up)
1027 unsigned char status1, status2, scratch, scratch2, scratch3;
1028 unsigned char save_lcr, save_mcr;
1029 unsigned long flags;
1031 if (up->su_type == SU_PORT_NONE)
1034 up->type_probed = PORT_UNKNOWN;
1035 up->port.iotype = UPIO_MEM;
1037 spin_lock_irqsave(&up->port.lock, flags);
1039 if (!(up->port.flags & UPF_BUGGY_UART)) {
1041 * Do a simple existence test first; if we fail this, there's
1042 * no point trying anything else.
1044 * 0x80 is used as a nonsense port to prevent against false
1045 * positives due to ISA bus float. The assumption is that
1046 * 0x80 is a non-existent port; which should be safe since
1047 * include/asm/io.h also makes this assumption.
1049 scratch = serial_inp(up, UART_IER);
1050 serial_outp(up, UART_IER, 0);
1054 scratch2 = serial_inp(up, UART_IER);
1055 serial_outp(up, UART_IER, 0x0f);
1059 scratch3 = serial_inp(up, UART_IER);
1060 serial_outp(up, UART_IER, scratch);
1061 if (scratch2 != 0 || scratch3 != 0x0F)
1062 goto out; /* We failed; there's nothing here */
1065 save_mcr = serial_in(up, UART_MCR);
1066 save_lcr = serial_in(up, UART_LCR);
1069 * Check to see if a UART is really there. Certain broken
1070 * internal modems based on the Rockwell chipset fail this
1071 * test, because they apparently don't implement the loopback
1072 * test mode. So this test is skipped on the COM 1 through
1073 * COM 4 ports. This *should* be safe, since no board
1074 * manufacturer would be stupid enough to design a board
1075 * that conflicts with COM 1-4 --- we hope!
1077 if (!(up->port.flags & UPF_SKIP_TEST)) {
1078 serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
1079 status1 = serial_inp(up, UART_MSR) & 0xF0;
1080 serial_outp(up, UART_MCR, save_mcr);
1081 if (status1 != 0x90)
1082 goto out; /* We failed loopback test */
1084 serial_outp(up, UART_LCR, 0xBF); /* set up for StarTech test */
1085 serial_outp(up, UART_EFR, 0); /* EFR is the same as FCR */
1086 serial_outp(up, UART_LCR, 0);
1087 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1088 scratch = serial_in(up, UART_IIR) >> 6;
1091 up->port.type = PORT_16450;
1094 up->port.type = PORT_UNKNOWN;
1097 up->port.type = PORT_16550;
1100 up->port.type = PORT_16550A;
1103 if (up->port.type == PORT_16550A) {
1104 /* Check for Startech UART's */
1105 serial_outp(up, UART_LCR, UART_LCR_DLAB);
1106 if (serial_in(up, UART_EFR) == 0) {
1107 up->port.type = PORT_16650;
1109 serial_outp(up, UART_LCR, 0xBF);
1110 if (serial_in(up, UART_EFR) == 0)
1111 up->port.type = PORT_16650V2;
1114 if (up->port.type == PORT_16550A) {
1115 /* Check for TI 16750 */
1116 serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
1117 serial_outp(up, UART_FCR,
1118 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1119 scratch = serial_in(up, UART_IIR) >> 5;
1122 * If this is a 16750, and not a cheap UART
1123 * clone, then it should only go into 64 byte
1124 * mode if the UART_FCR7_64BYTE bit was set
1125 * while UART_LCR_DLAB was latched.
1127 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1128 serial_outp(up, UART_LCR, 0);
1129 serial_outp(up, UART_FCR,
1130 UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
1131 scratch = serial_in(up, UART_IIR) >> 5;
1133 up->port.type = PORT_16750;
1135 serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
1137 serial_outp(up, UART_LCR, save_lcr);
1138 if (up->port.type == PORT_16450) {
1139 scratch = serial_in(up, UART_SCR);
1140 serial_outp(up, UART_SCR, 0xa5);
1141 status1 = serial_in(up, UART_SCR);
1142 serial_outp(up, UART_SCR, 0x5a);
1143 status2 = serial_in(up, UART_SCR);
1144 serial_outp(up, UART_SCR, scratch);
1146 if ((status1 != 0xa5) || (status2 != 0x5a))
1147 up->port.type = PORT_8250;
1150 up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
1152 if (up->port.type == PORT_UNKNOWN)
1154 up->type_probed = up->port.type; /* XXX */
1159 #ifdef CONFIG_SERIAL_8250_RSA
1160 if (up->port.type == PORT_RSA)
1161 serial_outp(up, UART_RSA_FRR, 0);
1163 serial_outp(up, UART_MCR, save_mcr);
1164 serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
1165 UART_FCR_CLEAR_RCVR |
1166 UART_FCR_CLEAR_XMIT));
1167 serial_outp(up, UART_FCR, 0);
1168 (void)serial_in(up, UART_RX);
1169 serial_outp(up, UART_IER, 0);
1172 spin_unlock_irqrestore(&up->port.lock, flags);
1175 static struct uart_driver sunsu_reg = {
1176 .owner = THIS_MODULE,
1177 .driver_name = "serial",
1182 static int __init sunsu_kbd_ms_init(struct uart_sunsu_port *up)
1186 struct serio *serio;
1189 if (up->su_type == SU_PORT_KBD) {
1190 up->cflag = B1200 | CS8 | CLOCAL | CREAD;
1193 up->cflag = B4800 | CS8 | CLOCAL | CREAD;
1196 quot = up->port.uartclk / (16 * baud);
1198 sunsu_autoconfig(up);
1199 if (up->port.type == PORT_UNKNOWN)
1202 printk("%s: %s port at %lx, irq %u\n",
1203 to_of_device(up->port.dev)->node->full_name,
1204 (up->su_type == SU_PORT_KBD) ? "Keyboard" : "Mouse",
1205 up->port.mapbase, up->port.irq);
1209 serio->port_data = up;
1211 serio->id.type = SERIO_RS232;
1212 if (up->su_type == SU_PORT_KBD) {
1213 serio->id.proto = SERIO_SUNKBD;
1214 strlcpy(serio->name, "sukbd", sizeof(serio->name));
1216 serio->id.proto = SERIO_SUN;
1217 serio->id.extra = 1;
1218 strlcpy(serio->name, "sums", sizeof(serio->name));
1220 strlcpy(serio->phys,
1221 (!(up->port.line & 1) ? "su/serio0" : "su/serio1"),
1222 sizeof(serio->phys));
1224 serio->write = sunsu_serio_write;
1225 serio->open = sunsu_serio_open;
1226 serio->close = sunsu_serio_close;
1227 serio->dev.parent = up->port.dev;
1229 serio_register_port(serio);
1232 sunsu_change_speed(&up->port, up->cflag, 0, quot);
1234 sunsu_startup(&up->port);
1239 * ------------------------------------------------------------
1240 * Serial console driver
1241 * ------------------------------------------------------------
1244 #ifdef CONFIG_SERIAL_SUNSU_CONSOLE
1246 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
1249 * Wait for transmitter & holding register to empty
1251 static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
1253 unsigned int status, tmout = 10000;
1255 /* Wait up to 10ms for the character(s) to be sent. */
1257 status = serial_in(up, UART_LSR);
1259 if (status & UART_LSR_BI)
1260 up->lsr_break_flag = UART_LSR_BI;
1265 } while ((status & BOTH_EMPTY) != BOTH_EMPTY);
1267 /* Wait up to 1s for flow control if necessary */
1268 if (up->port.flags & UPF_CONS_FLOW) {
1271 ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
1276 static void sunsu_console_putchar(struct uart_port *port, int ch)
1278 struct uart_sunsu_port *up = (struct uart_sunsu_port *)port;
1281 serial_out(up, UART_TX, ch);
1285 * Print a string to the serial port trying not to disturb
1286 * any possible real use of the port...
1288 static void sunsu_console_write(struct console *co, const char *s,
1291 struct uart_sunsu_port *up = &sunsu_ports[co->index];
1295 * First save the UER then disable the interrupts
1297 ier = serial_in(up, UART_IER);
1298 serial_out(up, UART_IER, 0);
1300 uart_console_write(&up->port, s, count, sunsu_console_putchar);
1303 * Finally, wait for transmitter to become empty
1304 * and restore the IER
1307 serial_out(up, UART_IER, ier);
1311 * Setup initial baud/bits/parity. We do two things here:
1312 * - construct a cflag setting for the first su_open()
1313 * - initialize the serial port
1314 * Return non-zero if we didn't find a serial port.
1316 static int sunsu_console_setup(struct console *co, char *options)
1318 struct uart_port *port;
1324 printk("Console: ttyS%d (SU)\n",
1325 (sunsu_reg.minor - 64) + co->index);
1328 * Check whether an invalid uart number has been specified, and
1329 * if so, search for the first available port that does have
1332 if (co->index >= UART_NR)
1334 port = &sunsu_ports[co->index].port;
1339 spin_lock_init(&port->lock);
1342 uart_parse_options(options, &baud, &parity, &bits, &flow);
1344 return uart_set_options(port, co, baud, parity, bits, flow);
1347 static struct console sunsu_cons = {
1349 .write = sunsu_console_write,
1350 .device = uart_console_device,
1351 .setup = sunsu_console_setup,
1352 .flags = CON_PRINTBUFFER,
1361 static inline struct console *SUNSU_CONSOLE(int num_uart)
1365 if (con_is_present())
1368 for (i = 0; i < num_uart; i++) {
1369 int this_minor = sunsu_reg.minor + i;
1371 if ((this_minor - 64) == (serial_console - 1))
1377 sunsu_cons.index = i;
1382 #define SUNSU_CONSOLE(num_uart) (NULL)
1383 #define sunsu_serial_console_init() do { } while (0)
1386 static enum su_type __devinit su_get_type(struct device_node *dp)
1388 struct device_node *ap = of_find_node_by_path("/aliases");
1391 char *keyb = of_get_property(ap, "keyboard", NULL);
1392 char *ms = of_get_property(ap, "mouse", NULL);
1395 if (dp == of_find_node_by_path(keyb))
1399 if (dp == of_find_node_by_path(ms))
1404 return SU_PORT_PORT;
1407 static int __devinit su_probe(struct of_device *op, const struct of_device_id *match)
1410 struct device_node *dp = op->node;
1411 struct uart_sunsu_port *up;
1412 struct resource *rp;
1416 type = su_get_type(dp);
1417 if (type == SU_PORT_PORT) {
1418 if (inst >= UART_NR)
1420 up = &sunsu_ports[inst];
1422 up = kzalloc(sizeof(*up), GFP_KERNEL);
1427 up->port.line = inst;
1429 spin_lock_init(&up->port.lock);
1433 rp = &op->resource[0];
1434 up->port.mapbase = rp->start;
1435 up->reg_size = (rp->end - rp->start) + 1;
1436 up->port.membase = of_ioremap(rp, 0, up->reg_size, "su");
1437 if (!up->port.membase) {
1438 if (type != SU_PORT_PORT)
1443 up->port.irq = op->irqs[0];
1445 up->port.dev = &op->dev;
1447 up->port.type = PORT_UNKNOWN;
1448 up->port.uartclk = (SU_BASE_BAUD * 16);
1451 if (up->su_type == SU_PORT_KBD || up->su_type == SU_PORT_MS) {
1452 err = sunsu_kbd_ms_init(up);
1457 dev_set_drvdata(&op->dev, up);
1462 up->port.flags |= UPF_BOOT_AUTOCONF;
1464 sunsu_autoconfig(up);
1467 if (up->port.type == PORT_UNKNOWN)
1470 up->port.ops = &sunsu_pops;
1472 err = uart_add_one_port(&sunsu_reg, &up->port);
1476 dev_set_drvdata(&op->dev, up);
1483 of_iounmap(up->port.membase, up->reg_size);
1487 static int __devexit su_remove(struct of_device *dev)
1489 struct uart_sunsu_port *up = dev_get_drvdata(&dev->dev);;
1491 if (up->su_type == SU_PORT_MS ||
1492 up->su_type == SU_PORT_KBD) {
1494 serio_unregister_port(&up->serio);
1497 } else if (up->port.type != PORT_UNKNOWN) {
1498 uart_remove_one_port(&sunsu_reg, &up->port);
1501 if (up->port.membase)
1502 of_iounmap(up->port.membase, up->reg_size);
1504 dev_set_drvdata(&dev->dev, NULL);
1509 static struct of_device_id su_match[] = {
1522 MODULE_DEVICE_TABLE(of, su_match);
1524 static struct of_platform_driver su_driver = {
1526 .match_table = su_match,
1528 .remove = __devexit_p(su_remove),
1531 static int num_uart;
1533 static int __init sunsu_init(void)
1535 struct device_node *dp;
1539 for_each_node_by_name(dp, "su") {
1540 if (su_get_type(dp) == SU_PORT_PORT)
1543 for_each_node_by_name(dp, "su_pnp") {
1544 if (su_get_type(dp) == SU_PORT_PORT)
1547 for_each_node_by_name(dp, "serial") {
1548 if (of_device_is_compatible(dp, "su")) {
1549 if (su_get_type(dp) == SU_PORT_PORT)
1555 sunsu_reg.minor = sunserial_current_minor;
1556 sunsu_reg.nr = num_uart;
1557 err = uart_register_driver(&sunsu_reg);
1560 sunsu_reg.tty_driver->name_base = sunsu_reg.minor - 64;
1561 sunserial_current_minor += num_uart;
1562 sunsu_reg.cons = SUNSU_CONSOLE(num_uart);
1565 err = of_register_driver(&su_driver, &of_bus_type);
1566 if (err && num_uart)
1567 uart_unregister_driver(&sunsu_reg);
1572 static void __exit sunsu_exit(void)
1575 uart_unregister_driver(&sunsu_reg);
1578 module_init(sunsu_init);
1579 module_exit(sunsu_exit);
1581 MODULE_AUTHOR("Eddie C. Dost, Peter Zaitcev, and David S. Miller");
1582 MODULE_DESCRIPTION("Sun SU serial port driver");
1583 MODULE_VERSION("2.0");
1584 MODULE_LICENSE("GPL");