2 * C-Brick Serial Port (and console) driver for SGI Altix machines.
4 * This driver is NOT suitable for talking to the l1-controller for
5 * anything other than 'console activities' --- please use the l1
9 * Copyright (c) 2004 Silicon Graphics, Inc. All Rights Reserved.
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of version 2 of the GNU General Public License
13 * as published by the Free Software Foundation.
15 * This program is distributed in the hope that it would be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
19 * Further, this software is distributed without any warranty that it is
20 * free of the rightful claim of any third person regarding infringement
21 * or the like. Any license provided herein, whether implied or
22 * otherwise, applies only to this software file. Patent licenses, if
23 * any, provided herein do not apply to combinations of this program with
24 * other software, or any other product whatsoever.
26 * You should have received a copy of the GNU General Public
27 * License along with this program; if not, write the Free Software
28 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
30 * Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane,
31 * Mountain View, CA 94043, or:
35 * For further information regarding this notice, see:
37 * http://oss.sgi.com/projects/GenInfo/NoticeExplan
40 #include <linux/config.h>
41 #include <linux/interrupt.h>
42 #include <linux/tty.h>
43 #include <linux/serial.h>
44 #include <linux/console.h>
45 #include <linux/module.h>
46 #include <linux/sysrq.h>
47 #include <linux/circ_buf.h>
48 #include <linux/serial_reg.h>
49 #include <linux/delay.h> /* for mdelay */
50 #include <linux/miscdevice.h>
51 #include <linux/serial_core.h>
53 #include <asm/sn/simulator.h>
54 #include <asm/sn/sn2/sn_private.h>
55 #include <asm/sn/sn_sal.h>
57 /* number of characters we can transmit to the SAL console at a time */
58 #define SN_SAL_MAX_CHARS 120
60 /* 64K, when we're asynch, it must be at least printk's LOG_BUF_LEN to
61 * avoid losing chars, (always has to be a power of 2) */
62 #define SN_SAL_BUFFER_SIZE (64 * (1 << 10))
64 #define SN_SAL_UART_FIFO_DEPTH 16
65 #define SN_SAL_UART_FIFO_SPEED_CPS 9600/10
67 /* sn_transmit_chars() calling args */
68 #define TRANSMIT_BUFFERED 0
69 #define TRANSMIT_RAW 1
71 /* To use dynamic numbers only and not use the assigned major and minor,
72 * define the following.. */
73 /* #define USE_DYNAMIC_MINOR 1 */ /* use dynamic minor number */
74 #define USE_DYNAMIC_MINOR 0 /* Don't rely on misc_register dynamic minor */
76 /* Device name we're using */
77 #define DEVICE_NAME "ttySG"
78 #define DEVICE_NAME_DYNAMIC "ttySG0" /* need full name for misc_register */
79 /* The major/minor we are using, ignored for USE_DYNAMIC_MINOR */
80 #define DEVICE_MAJOR 204
81 #define DEVICE_MINOR 40
84 * Port definition - this kinda drives it all
87 struct timer_list sc_timer;
88 struct uart_port sc_port;
90 int (*sal_puts_raw) (const char *s, int len);
91 int (*sal_puts) (const char *s, int len);
92 int (*sal_getc) (void);
93 int (*sal_input_pending) (void);
94 void (*sal_wakeup_transmit) (struct sn_cons_port *, int);
96 unsigned long sc_interrupt_timeout;
100 static struct sn_cons_port sal_console_port;
102 /* Only used if USE_DYNAMIC_MINOR is set to 1 */
103 static struct miscdevice misc; /* used with misc_register for dynamic */
105 extern u64 master_node_bedrock_address;
106 extern void early_sn_setup(void);
110 static int sn_debug_printf(const char *fmt, ...);
111 #define DPRINTF(x...) sn_debug_printf(x)
113 #define DPRINTF(x...) do { } while (0)
117 static int snt_hw_puts_raw(const char *, int);
118 static int snt_hw_puts_buffered(const char *, int);
119 static int snt_poll_getc(void);
120 static int snt_poll_input_pending(void);
121 static int snt_sim_puts(const char *, int);
122 static int snt_sim_getc(void);
123 static int snt_sim_input_pending(void);
124 static int snt_intr_getc(void);
125 static int snt_intr_input_pending(void);
126 static void sn_transmit_chars(struct sn_cons_port *, int);
128 /* A table for polling:
130 static struct sn_sal_ops poll_ops = {
131 .sal_puts_raw = snt_hw_puts_raw,
132 .sal_puts = snt_hw_puts_raw,
133 .sal_getc = snt_poll_getc,
134 .sal_input_pending = snt_poll_input_pending
137 /* A table for the simulator */
138 static struct sn_sal_ops sim_ops = {
139 .sal_puts_raw = snt_sim_puts,
140 .sal_puts = snt_sim_puts,
141 .sal_getc = snt_sim_getc,
142 .sal_input_pending = snt_sim_input_pending
145 /* A table for interrupts enabled */
146 static struct sn_sal_ops intr_ops = {
147 .sal_puts_raw = snt_hw_puts_raw,
148 .sal_puts = snt_hw_puts_buffered,
149 .sal_getc = snt_intr_getc,
150 .sal_input_pending = snt_intr_input_pending,
151 .sal_wakeup_transmit = sn_transmit_chars
154 /* the console does output in two distinctly different ways:
155 * synchronous (raw) and asynchronous (buffered). initally, early_printk
156 * does synchronous output. any data written goes directly to the SAL
157 * to be output (incidentally, it is internally buffered by the SAL)
158 * after interrupts and timers are initialized and available for use,
159 * the console init code switches to asynchronous output. this is
160 * also the earliest opportunity to begin polling for console input.
161 * after console initialization, console output and tty (serial port)
162 * output is buffered and sent to the SAL asynchronously (either by
163 * timer callback or by UART interrupt) */
166 /* routines for running the console in polling mode */
169 * snt_poll_getc - Get a character from the console in polling mode
177 ia64_sn_console_getc(&ch);
182 * snt_poll_input_pending - Check if any input is waiting - polling mode.
186 snt_poll_input_pending(void)
190 status = ia64_sn_console_check(&input);
191 return !status && input;
194 /* routines for running the console on the simulator */
197 * snt_sim_puts - send to the console, used in simulator mode
198 * @str: String to send
199 * @count: length of string
203 snt_sim_puts(const char *str, int count)
207 #ifdef FLAG_DIRECT_CONSOLE_WRITES
208 /* This is an easy way to pre-pend the output to know whether the output
209 * was done via sal or directly */
210 writeb('[', master_node_bedrock_address + (UART_TX << 3));
211 writeb('+', master_node_bedrock_address + (UART_TX << 3));
212 writeb(']', master_node_bedrock_address + (UART_TX << 3));
213 writeb(' ', master_node_bedrock_address + (UART_TX << 3));
214 #endif /* FLAG_DIRECT_CONSOLE_WRITES */
215 while (counter > 0) {
216 writeb(*str, master_node_bedrock_address + (UART_TX << 3));
224 * snt_sim_getc - Get character from console in simulator mode
230 return readb(master_node_bedrock_address + (UART_RX << 3));
234 * snt_sim_input_pending - Check if there is input pending in simulator mode
238 snt_sim_input_pending(void)
240 return readb(master_node_bedrock_address +
241 (UART_LSR << 3)) & UART_LSR_DR;
244 /* routines for an interrupt driven console (normal) */
247 * snt_intr_getc - Get a character from the console, interrupt mode
253 return ia64_sn_console_readc();
257 * snt_intr_input_pending - Check if input is pending, interrupt mode
261 snt_intr_input_pending(void)
263 return ia64_sn_console_intr_status() & SAL_CONSOLE_INTR_RECV;
266 /* these functions are polled and interrupt */
269 * snt_hw_puts_raw - Send raw string to the console, polled or interrupt mode
275 snt_hw_puts_raw(const char *s, int len)
277 /* this will call the PROM and not return until this is done */
278 return ia64_sn_console_putb(s, len);
282 * snt_hw_puts_buffered - Send string to console, polled or interrupt mode
288 snt_hw_puts_buffered(const char *s, int len)
290 /* queue data to the PROM */
291 return ia64_sn_console_xmit_chars((char *)s, len);
294 /* uart interface structs
295 * These functions are associated with the uart_port that the serial core
296 * infrastructure calls.
298 * Note: Due to how the console works, many routines are no-ops.
302 * snp_type - What type of console are we?
303 * @port: Port to operate with (we ignore since we only have one port)
307 snp_type(struct uart_port *port)
309 return ("SGI SN L1");
313 * snp_tx_empty - Is the transmitter empty? We pretend we're always empty
314 * @port: Port to operate on (we ignore since we only have one port)
318 snp_tx_empty(struct uart_port *port)
324 * snp_stop_tx - stop the transmitter - no-op for us
325 * @port: Port to operat eon - we ignore - no-op function
326 * @tty_stop: Set to 1 if called via uart_stop
330 snp_stop_tx(struct uart_port *port, unsigned int tty_stop)
335 * snp_release_port - Free i/o and resources for port - no-op for us
336 * @port: Port to operate on - we ignore - no-op function
340 snp_release_port(struct uart_port *port)
345 * snp_enable_ms - Force modem status interrupts on - no-op for us
346 * @port: Port to operate on - we ignore - no-op function
350 snp_enable_ms(struct uart_port *port)
355 * snp_shutdown - shut down the port - free irq and disable - no-op for us
356 * @port: Port to shut down - we ignore
360 snp_shutdown(struct uart_port *port)
365 * snp_set_mctrl - set control lines (dtr, rts, etc) - no-op for our console
366 * @port: Port to operate on - we ignore
367 * @mctrl: Lines to set/unset - we ignore
371 snp_set_mctrl(struct uart_port *port, unsigned int mctrl)
376 * snp_get_mctrl - get contorl line info, we just return a static value
377 * @port: port to operate on - we only have one port so we ignore this
381 snp_get_mctrl(struct uart_port *port)
383 return TIOCM_CAR | TIOCM_RNG | TIOCM_DSR | TIOCM_CTS;
387 * snp_stop_rx - Stop the receiver - we ignor ethis
388 * @port: Port to operate on - we ignore
392 snp_stop_rx(struct uart_port *port)
397 * snp_start_tx - Start transmitter
398 * @port: Port to operate on
399 * @tty_stop: Set to 1 if called via uart_start
403 snp_start_tx(struct uart_port *port, unsigned int tty_stop)
405 if (sal_console_port.sc_ops->sal_wakeup_transmit)
406 sal_console_port.sc_ops->sal_wakeup_transmit(&sal_console_port, TRANSMIT_BUFFERED);
411 * snp_break_ctl - handle breaks - ignored by us
412 * @port: Port to operate on
413 * @break_state: Break state
417 snp_break_ctl(struct uart_port *port, int break_state)
422 * snp_startup - Start up the serial port - always return 0 (We're always on)
423 * @port: Port to operate on
427 snp_startup(struct uart_port *port)
433 * snp_set_termios - set termios stuff - we ignore these
434 * @port: port to operate on
435 * @termios: New settings
440 snp_set_termios(struct uart_port *port, struct termios *termios,
446 * snp_request_port - allocate resources for port - ignored by us
447 * @port: port to operate on
451 snp_request_port(struct uart_port *port)
457 * snp_config_port - allocate resources, set up - we ignore, we're always on
458 * @port: Port to operate on
459 * @flags: flags used for port setup
463 snp_config_port(struct uart_port *port, int flags)
467 /* Associate the uart functions above - given to serial core */
469 static struct uart_ops sn_console_ops = {
470 .tx_empty = snp_tx_empty,
471 .set_mctrl = snp_set_mctrl,
472 .get_mctrl = snp_get_mctrl,
473 .stop_tx = snp_stop_tx,
474 .start_tx = snp_start_tx,
475 .stop_rx = snp_stop_rx,
476 .enable_ms = snp_enable_ms,
477 .break_ctl = snp_break_ctl,
478 .startup = snp_startup,
479 .shutdown = snp_shutdown,
480 .set_termios = snp_set_termios,
483 .release_port = snp_release_port,
484 .request_port = snp_request_port,
485 .config_port = snp_config_port,
489 /* End of uart struct functions and defines */
494 * sn_debug_printf - close to hardware debugging printf
495 * @fmt: printf format
497 * This is as "close to the metal" as we can get, used when the driver
498 * itself may be broken.
502 sn_debug_printf(const char *fmt, ...)
504 static char printk_buf[1024];
509 printed_len = vsnprintf(printk_buf, sizeof (printk_buf), fmt, args);
511 if (!sal_console_port.sc_ops) {
512 if (IS_RUNNING_ON_SIMULATOR())
513 sal_console_port.sc_ops = &sim_ops;
515 sal_console_port.sc_ops = &poll_ops;
519 sal_console_port.sc_ops->sal_puts_raw(printk_buf, printed_len);
527 * Interrupt handling routines.
532 * sn_receive_chars - Grab characters, pass them to tty layer
533 * @port: Port to operate on
534 * @regs: Saved registers (needed by uart_handle_sysrq_char)
536 * Note: If we're not registered with the serial core infrastructure yet,
537 * we don't try to send characters to it...
541 sn_receive_chars(struct sn_cons_port *port, struct pt_regs *regs)
544 struct tty_struct *tty;
547 printk(KERN_ERR "sn_receive_chars - port NULL so can't receieve\n");
552 printk(KERN_ERR "sn_receive_chars - port->sc_ops NULL so can't receieve\n");
556 if (port->sc_port.info) {
557 /* The serial_core stuffs are initilized, use them */
558 tty = port->sc_port.info->tty;
561 /* Not registered yet - can't pass to tty layer. */
565 while (port->sc_ops->sal_input_pending()) {
566 ch = port->sc_ops->sal_getc();
568 printk(KERN_ERR "sn_console: An error occured while "
569 "obtaining data from the console (0x%0x)\n", ch);
572 #if defined(CONFIG_SERIAL_SGI_L1_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
573 if (uart_handle_sysrq_char(&port->sc_port, ch, regs))
575 #endif /* CONFIG_SERIAL_SGI_L1_CONSOLE && CONFIG_MAGIC_SYSRQ */
577 /* record the character to pass up to the tty layer */
579 *tty->flip.char_buf_ptr = ch;
580 *tty->flip.flag_buf_ptr = TTY_NORMAL;
581 tty->flip.char_buf_ptr++;
583 if (tty->flip.count == TTY_FLIPBUF_SIZE)
588 port->sc_port.icount.rx++;
592 tty_flip_buffer_push(tty);
596 * sn_transmit_chars - grab characters from serial core, send off
597 * @port: Port to operate on
598 * @raw: Transmit raw or buffered
600 * Note: If we're early, before we're registered with serial core, the
601 * writes are going through sn_sal_console_write because that's how
602 * register_console has been set up. We currently could have asynch
603 * polls calling this function due to sn_sal_switch_to_asynch but we can
604 * ignore them until we register with the serial core stuffs.
608 sn_transmit_chars(struct sn_cons_port *port, int raw)
610 int xmit_count, tail, head, loops, ii;
613 struct circ_buf *xmit;
618 BUG_ON(!port->sc_is_asynch);
620 if (port->sc_port.info) {
621 /* We're initilized, using serial core infrastructure */
622 xmit = &port->sc_port.info->xmit;
625 /* Probably sn_sal_switch_to_asynch has been run but serial core isn't
626 * initilized yet. Just return. Writes are going through
627 * sn_sal_console_write (due to register_console) at this time.
632 if (uart_circ_empty(xmit) || uart_tx_stopped(&port->sc_port)) {
639 start = &xmit->buf[tail];
641 /* twice around gets the tail to the end of the buffer and
642 * then to the head, if needed */
643 loops = (head < tail) ? 2 : 1;
645 for (ii = 0; ii < loops; ii++) {
646 xmit_count = (head < tail) ?
647 (UART_XMIT_SIZE - tail) : (head - tail);
649 if (xmit_count > 0) {
650 if (raw == TRANSMIT_RAW)
652 port->sc_ops->sal_puts_raw(start,
656 port->sc_ops->sal_puts(start, xmit_count);
662 xmit_count -= result;
663 port->sc_port.icount.tx += result;
665 tail &= UART_XMIT_SIZE - 1;
667 start = &xmit->buf[tail];
672 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
673 uart_write_wakeup(&port->sc_port);
675 if (uart_circ_empty(xmit))
676 snp_stop_tx(&port->sc_port, 0); /* no-op for us */
680 * sn_sal_interrupt - Handle console interrupts
681 * @irq: irq #, useful for debug statements
682 * @dev_id: our pointer to our port (sn_cons_port which contains the uart port)
683 * @regs: Saved registers, used by sn_receive_chars for uart_handle_sysrq_char
687 sn_sal_interrupt(int irq, void *dev_id, struct pt_regs *regs)
689 struct sn_cons_port *port = (struct sn_cons_port *) dev_id;
691 int status = ia64_sn_console_intr_status();
696 spin_lock_irqsave(&port->sc_port.lock, flags);
697 if (status & SAL_CONSOLE_INTR_RECV) {
698 sn_receive_chars(port, regs);
700 if (status & SAL_CONSOLE_INTR_XMIT) {
701 sn_transmit_chars(port, TRANSMIT_BUFFERED);
703 spin_unlock_irqrestore(&port->sc_port.lock, flags);
708 * sn_sal_connect_interrupt - Request interrupt, handled by sn_sal_interrupt
709 * @port: Our sn_cons_port (which contains the uart port)
711 * returns the console irq if interrupt is successfully registered, else 0
715 sn_sal_connect_interrupt(struct sn_cons_port *port)
717 if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt, SA_INTERRUPT,
718 "SAL console driver", port) >= 0) {
719 return SGI_UART_VECTOR;
722 printk(KERN_INFO "sn_console: console proceeding in polled mode\n");
727 * sn_sal_timer_poll - this function handles polled console mode
728 * @data: A pointer to our sn_cons_port (which contains the uart port)
730 * data is the pointer that init_timer will store for us. This function is
731 * associated with init_timer to see if there is any console traffic.
732 * Obviously not used in interrupt mode
736 sn_sal_timer_poll(unsigned long data)
738 struct sn_cons_port *port = (struct sn_cons_port *) data;
744 if (!port->sc_port.irq) {
745 spin_lock_irqsave(&port->sc_port.lock, flags);
746 sn_receive_chars(port, NULL);
747 sn_transmit_chars(port, TRANSMIT_RAW);
748 spin_unlock_irqrestore(&port->sc_port.lock, flags);
749 mod_timer(&port->sc_timer,
750 jiffies + port->sc_interrupt_timeout);
755 * Boot-time initialization code
759 * sn_sal_switch_to_asynch - Switch to async mode (as opposed to synch)
760 * @port: Our sn_cons_port (which contains the uart port)
762 * So this is used by sn_sal_serial_console_init (early on, before we're
763 * registered with serial core). It's also used by sn_sal_module_init
764 * right after we've registered with serial core. The later only happens
765 * if we didn't already come through here via sn_sal_serial_console_init.
769 sn_sal_switch_to_asynch(struct sn_cons_port *port)
776 DPRINTF("sn_console: about to switch to asynchronous console\n");
778 /* without early_printk, we may be invoked late enough to race
779 * with other cpus doing console IO at this point, however
780 * console interrupts will never be enabled */
781 spin_lock_irqsave(&port->sc_port.lock, flags);
783 /* early_printk invocation may have done this for us */
785 if (IS_RUNNING_ON_SIMULATOR())
786 port->sc_ops = &sim_ops;
788 port->sc_ops = &poll_ops;
791 /* we can't turn on the console interrupt (as request_irq
792 * calls kmalloc, which isn't set up yet), so we rely on a
793 * timer to poll for input and push data from the console
796 init_timer(&port->sc_timer);
797 port->sc_timer.function = sn_sal_timer_poll;
798 port->sc_timer.data = (unsigned long) port;
800 if (IS_RUNNING_ON_SIMULATOR())
801 port->sc_interrupt_timeout = 6;
803 /* 960cps / 16 char FIFO = 60HZ
804 * HZ / (SN_SAL_FIFO_SPEED_CPS / SN_SAL_FIFO_DEPTH) */
805 port->sc_interrupt_timeout =
806 HZ * SN_SAL_UART_FIFO_DEPTH / SN_SAL_UART_FIFO_SPEED_CPS;
808 mod_timer(&port->sc_timer, jiffies + port->sc_interrupt_timeout);
810 port->sc_is_asynch = 1;
811 spin_unlock_irqrestore(&port->sc_port.lock, flags);
815 * sn_sal_switch_to_interrupts - Switch to interrupt driven mode
816 * @port: Our sn_cons_port (which contains the uart port)
818 * In sn_sal_module_init, after we're registered with serial core and
819 * the port is added, this function is called to switch us to interrupt
820 * mode. We were previously in asynch/polling mode (using init_timer).
822 * We attempt to switch to interrupt mode here by calling
823 * sn_sal_connect_interrupt. If that works out, we enable receive interrupts.
826 sn_sal_switch_to_interrupts(struct sn_cons_port *port)
834 DPRINTF("sn_console: switching to interrupt driven console\n");
836 spin_lock_irqsave(&port->sc_port.lock, flags);
838 irq = sn_sal_connect_interrupt(port);
841 port->sc_port.irq = irq;
842 port->sc_ops = &intr_ops;
844 /* turn on receive interrupts */
845 ia64_sn_console_intr_enable(SAL_CONSOLE_INTR_RECV);
847 spin_unlock_irqrestore(&port->sc_port.lock, flags);
851 * Kernel console definitions
854 #ifdef CONFIG_SERIAL_SGI_L1_CONSOLE
855 static void sn_sal_console_write(struct console *, const char *, unsigned);
856 static int __init sn_sal_console_setup(struct console *, char *);
857 extern struct uart_driver sal_console_uart;
858 extern struct tty_driver *uart_console_device(struct console *, int *);
860 static struct console sal_console = {
862 .write = sn_sal_console_write,
863 .device = uart_console_device,
864 .setup = sn_sal_console_setup,
865 .index = -1, /* unspecified */
866 .data = &sal_console_uart,
869 #define SAL_CONSOLE &sal_console
871 #define SAL_CONSOLE 0
872 #endif /* CONFIG_SERIAL_SGI_L1_CONSOLE */
874 static struct uart_driver sal_console_uart = {
875 .owner = THIS_MODULE,
876 .driver_name = "sn_console",
877 .dev_name = DEVICE_NAME,
878 .major = 0, /* major/minor set at registration time per USE_DYNAMIC_MINOR */
880 .nr = 1, /* one port */
885 * sn_sal_module_init - When the kernel loads us, get us rolling w/ serial core
887 * Before this is called, we've been printing kernel messages in a special
888 * early mode not making use of the serial core infrastructure. When our
889 * driver is loaded for real, we register the driver and port with serial
890 * core and try to enable interrupt driven mode.
894 sn_sal_module_init(void)
898 printk(KERN_INFO "sn_console: Console driver init\n");
900 if (!ia64_platform_is("sn2"))
903 if (USE_DYNAMIC_MINOR == 1) {
904 misc.minor = MISC_DYNAMIC_MINOR;
905 misc.name = DEVICE_NAME_DYNAMIC;
906 retval = misc_register(&misc);
908 printk("Failed to register console device using misc_register.\n");
911 sal_console_uart.major = MISC_MAJOR;
912 sal_console_uart.minor = misc.minor;
915 sal_console_uart.major = DEVICE_MAJOR;
916 sal_console_uart.minor = DEVICE_MINOR;
919 /* We register the driver and the port before switching to interrupts
920 * or async above so the proper uart structures are populated */
922 if (uart_register_driver(&sal_console_uart) < 0) {
923 printk("ERROR sn_sal_module_init failed uart_register_driver, line %d\n",
928 sal_console_port.sc_port.lock = SPIN_LOCK_UNLOCKED;
930 /* Setup the port struct with the minimum needed */
931 sal_console_port.sc_port.membase = (char *)1; /* just needs to be non-zero */
932 sal_console_port.sc_port.type = PORT_16550A;
933 sal_console_port.sc_port.fifosize = SN_SAL_MAX_CHARS;
934 sal_console_port.sc_port.ops = &sn_console_ops;
935 sal_console_port.sc_port.line = 0;
937 if (uart_add_one_port(&sal_console_uart, &sal_console_port.sc_port) < 0) {
938 /* error - not sure what I'd do - so I'll do nothing */
939 printk(KERN_ERR "%s: unable to add port\n", __FUNCTION__);
942 /* when this driver is compiled in, the console initialization
943 * will have already switched us into asynchronous operation
944 * before we get here through the module initcalls */
945 if (!sal_console_port.sc_is_asynch) {
946 sn_sal_switch_to_asynch(&sal_console_port);
949 /* at this point (module_init) we can try to turn on interrupts */
950 if (!IS_RUNNING_ON_SIMULATOR()) {
951 sn_sal_switch_to_interrupts(&sal_console_port);
957 * sn_sal_module_exit - When we're unloaded, remove the driver/port
961 sn_sal_module_exit(void)
963 del_timer_sync(&sal_console_port.sc_timer);
964 uart_remove_one_port(&sal_console_uart, &sal_console_port.sc_port);
965 uart_unregister_driver(&sal_console_uart);
966 misc_deregister(&misc);
969 module_init(sn_sal_module_init);
970 module_exit(sn_sal_module_exit);
972 #ifdef CONFIG_SERIAL_SGI_L1_CONSOLE
975 * puts_raw_fixed - sn_sal_console_write helper for adding \r's as required
976 * @puts_raw : puts function to do the writing
980 * We need a \r ahead of every \n for direct writes through
981 * ia64_sn_console_putb (what sal_puts_raw below actually does).
985 static void puts_raw_fixed(int (*puts_raw) (const char *s, int len), const char *s, int count)
989 /* Output '\r' before each '\n' */
990 while ((s1 = memchr(s, '\n', count)) != NULL) {
1000 * sn_sal_console_write - Print statements before serial core available
1001 * @console: Console to operate on - we ignore since we have just one
1002 * @s: String to send
1005 * This is referenced in the console struct. It is used for early
1006 * console printing before we register with serial core and for things
1007 * such as kdb. The console_lock must be held when we get here.
1009 * This function has some code for trying to print output even if the lock
1010 * is held. We try to cover the case where a lock holder could have died.
1011 * We don't use this special case code if we're not registered with serial
1012 * core yet. After we're registered with serial core, the only time this
1013 * function would be used is for high level kernel output like magic sys req,
1014 * kdb, and printk's.
1017 sn_sal_console_write(struct console *co, const char *s, unsigned count)
1019 unsigned long flags = 0;
1020 struct sn_cons_port *port = &sal_console_port;
1021 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
1022 static int stole_lock = 0;
1025 BUG_ON(!port->sc_is_asynch);
1027 /* We can't look at the xmit buffer if we're not registered with serial core
1028 * yet. So only do the fancy recovery after registering
1030 if (port->sc_port.info) {
1032 /* somebody really wants this output, might be an
1033 * oops, kdb, panic, etc. make sure they get it. */
1034 #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
1035 if (spin_is_locked(&port->sc_port.lock)) {
1036 int lhead = port->sc_port.info->xmit.head;
1037 int ltail = port->sc_port.info->xmit.tail;
1038 int counter, got_lock = 0;
1041 * We attempt to determine if someone has died with the
1042 * lock. We wait ~20 secs after the head and tail ptrs
1043 * stop moving and assume the lock holder is not functional
1044 * and plow ahead. If the lock is freed within the time out
1045 * period we re-get the lock and go ahead normally. We also
1046 * remember if we have plowed ahead so that we don't have
1047 * to wait out the time out period again - the asumption
1048 * is that we will time out again.
1051 for (counter = 0; counter < 150; mdelay(125), counter++) {
1052 if (!spin_is_locked(&port->sc_port.lock) || stole_lock) {
1054 spin_lock_irqsave(&port->sc_port.lock, flags);
1061 if ((lhead != port->sc_port.info->xmit.head) || (ltail != port->sc_port.info->xmit.tail)) {
1062 lhead = port->sc_port.info->xmit.head;
1063 ltail = port->sc_port.info->xmit.tail;
1068 /* flush anything in the serial core xmit buffer, raw */
1069 sn_transmit_chars(port, 1);
1071 spin_unlock_irqrestore(&port->sc_port.lock, flags);
1078 puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
1083 spin_lock_irqsave(&port->sc_port.lock, flags);
1084 sn_transmit_chars(port, 1);
1085 spin_unlock_irqrestore(&port->sc_port.lock, flags);
1087 puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
1091 /* Not yet registered with serial core - simple case */
1092 puts_raw_fixed(port->sc_ops->sal_puts_raw, s, count);
1098 * sn_sal_console_setup - Set up console for early printing
1099 * @co: Console to work with
1100 * @options: Options to set
1102 * Altix console doesn't do anything with baud rates, etc, anyway.
1104 * This isn't required since not providing the setup function in the
1105 * console struct is ok. However, other patches like KDB plop something
1106 * here so providing it is easier.
1110 sn_sal_console_setup(struct console *co, char *options)
1116 * sn_sal_console_write_early - simple early output routine
1117 * @co - console struct
1118 * @s - string to print
1121 * Simple function to provide early output, before even
1122 * sn_sal_serial_console_init is called. Referenced in the
1123 * console struct registerd in sn_serial_console_early_setup.
1127 sn_sal_console_write_early(struct console *co, const char *s, unsigned count)
1129 puts_raw_fixed(sal_console_port.sc_ops->sal_puts_raw, s, count);
1132 /* Used for very early console printing - again, before
1133 * sn_sal_serial_console_init is run */
1134 static struct console sal_console_early __initdata = {
1136 .write = sn_sal_console_write_early,
1137 .flags = CON_PRINTBUFFER,
1142 * sn_serial_console_early_setup - Sets up early console output support
1144 * Register a console early on... This is for output before even
1145 * sn_sal_serial_cosnole_init is called. This function is called from
1146 * setup.c. This allows us to do really early polled writes. When
1147 * sn_sal_serial_console_init is called, this console is unregistered
1148 * and a new one registered.
1151 sn_serial_console_early_setup(void)
1153 if (!ia64_platform_is("sn2"))
1156 if (IS_RUNNING_ON_SIMULATOR())
1157 sal_console_port.sc_ops = &sim_ops;
1159 sal_console_port.sc_ops = &poll_ops;
1161 early_sn_setup(); /* Find SAL entry points */
1162 register_console(&sal_console_early);
1169 * sn_sal_serial_console_init - Early console output - set up for register
1171 * This function is called when regular console init happens. Because we
1172 * support even earlier console output with sn_serial_console_early_setup
1173 * (called from setup.c directly), this function unregisters the really
1176 * Note: Even if setup.c doesn't register sal_console_early, unregistering
1177 * it here doesn't hurt anything.
1181 sn_sal_serial_console_init(void)
1183 if (ia64_platform_is("sn2")) {
1184 sn_sal_switch_to_asynch(&sal_console_port);
1185 DPRINTF ("sn_sal_serial_console_init : register console\n");
1186 register_console(&sal_console);
1187 unregister_console(&sal_console_early);
1192 console_initcall(sn_sal_serial_console_init);
1194 #endif /* CONFIG_SERIAL_SGI_L1_CONSOLE */