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      1 /*	$NetBSD: console.c,v 1.13 2021/09/04 02:19:56 tsutsui Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2000 Soren S. Jorvang.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions, and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: console.c,v 1.13 2021/09/04 02:19:56 tsutsui Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/systm.h>
     33 #include <sys/device.h>
     34 #include <sys/conf.h>
     35 
     36 #include <sys/bus.h>
     37 #include <machine/nvram.h>
     38 #include <machine/bootinfo.h>
     39 
     40 #include <dev/cons.h>
     41 
     42 #include <cobalt/dev/com_mainbusvar.h>
     43 #include <machine/z8530var.h>
     44 
     45 #include "com_mainbus.h"
     46 #include "zsc.h"
     47 #include "nullcons.h"
     48 
     49 int	console_present = 0;	/* Do we have a console? */
     50 
     51 struct	consdev	constab[] = {
     52 #if NCOM_MAINBUS > 0
     53 	{
     54 		.cn_probe = com_mainbus_cnprobe,
     55 		.cn_init  = com_mainbus_cninit,
     56 		.cn_getc  = NULL,
     57 		.cn_putc  = NULL,
     58 		.cn_pollc = NULL,
     59 		.cn_bell  = NULL,
     60 		.cn_halt  = NULL,
     61 		.cn_flush = NULL,
     62 		.cn_dev   = 0,
     63 		.cn_pri   = CN_DEAD
     64 	},
     65 #endif
     66 #if NZSC > 0
     67 	{
     68 		.cn_probe = zscnprobe,
     69 		.cn_init  = zscninit,
     70 		.cn_getc  = zscngetc,
     71 		.cn_putc  = zscnputc,
     72 		.cn_pollc = nullcnpollc,
     73 		.cn_bell  = NULL,
     74 		.cn_halt  = NULL,
     75 		.cn_flush = NULL,
     76 		.cn_dev   = NODEV,
     77 		.cn_pri   = CN_DEAD
     78 	},
     79 #endif
     80 #if NNULLCONS > 0
     81 	{
     82 		.cn_probe = nullcnprobe,
     83 		.cn_init  = nullcninit,
     84 		.cn_getc  = NULL,
     85 		.cn_putc  = NULL,
     86 		.cn_pollc = NULL,
     87 		.cn_bell  = NULL,
     88 		.cn_halt  = NULL,
     89 		.cn_flush = NULL,
     90 		.cn_dev   = 0,
     91 		.cn_pri   = CN_DEAD
     92 	},
     93 #endif
     94 	{
     95 		.cn_probe = NULL,
     96 		.cn_init  = NULL,
     97 		.cn_getc  = NULL,
     98 		.cn_putc  = NULL,
     99 		.cn_pollc = NULL,
    100 		.cn_bell  = NULL,
    101 		.cn_halt  = NULL,
    102 		.cn_flush = NULL,
    103 		.cn_dev   = 0,
    104 		.cn_pri   = CN_DEAD
    105 	}
    106 };
    107 
    108 #define CONSOLE_PROBE	0x0020001c	/* console flag passed by firmware */
    109 
    110 void
    111 consinit(void)
    112 {
    113 	struct btinfo_flags *bi_flags;
    114 	static int initted;
    115 
    116 	if (initted)
    117 		return;
    118 	initted = 1;
    119 
    120 	/*
    121 	 * Linux code has a comment that serial console must be probed
    122 	 * early, otherwise the value which allows to detect serial port
    123 	 * could be overwritten. Okay, probe here and record the result
    124 	 * for the future use.
    125 	 *
    126 	 * Note that if the kernel was booted with a boot loader,
    127 	 * the latter *has* to provide a flag indicating whether console
    128 	 * is present or not because the value might be overwritten by
    129 	 * the loaded kernel.
    130 	 */
    131 	bi_flags = lookup_bootinfo(BTINFO_FLAGS);
    132 	if (bi_flags == NULL) {
    133 		/* No boot information, probe console now */
    134 		console_present =
    135 		    *(volatile uint32_t *)MIPS_PHYS_TO_KSEG1(CONSOLE_PROBE);
    136 	} else {
    137 		/* Get the value determined by the boot loader. */
    138 		console_present = bi_flags->bi_flags & BI_SERIAL_CONSOLE;
    139 	}
    140 
    141 	cninit();
    142 }
    143