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      1 /*	$NetBSD: autoconf.c,v 1.10 2012/10/27 17:18:03 chs Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.10 2012/10/27 17:18:03 chs Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/systm.h>
     34 #include <sys/device.h>
     35 #include <sys/conf.h>
     36 #if defined(SH7750R)
     37 #include <sys/callout.h>
     38 #include <sys/kernel.h>
     39 #include <machine/mmeye.h>
     40 #endif
     41 #include <machine/bootinfo.h>
     42 
     43 static void findroot(void);
     44 
     45 static int bootunit;
     46 
     47 void
     48 cpu_configure(void)
     49 {
     50 	/* Start configuration */
     51 	splhigh();
     52 
     53 	findroot();
     54 
     55 	if (config_rootfound("mainbus", NULL) == NULL)
     56 		panic("no mainbus found");
     57 
     58 	/* Configuration is finished, turn on interrupts. */
     59 	spl0();
     60 
     61 #if defined(MMEYE_EPC_WDT)
     62 	callout_init(&epc_wdtc, 0);
     63 	callout_setfunc(&epc_wdtc, epc_watchdog_timer_reset, NULL);
     64 	epc_watchdog_timer_reset(NULL);
     65 #endif
     66 }
     67 
     68 void
     69 cpu_rootconf(void)
     70 {
     71 
     72 	printf("boot device: %s\n",
     73 	    booted_device ? device_xname(booted_device) : "<unknown>");
     74 
     75 	rootconf();
     76 }
     77 
     78 void
     79 device_register(device_t dev, void *aux)
     80 {
     81 
     82 	if (booted_device != NULL)
     83 		return;
     84 
     85 	/* check wd drive */
     86 	if (device_class(dev) == DV_DISK &&
     87 	    device_is_a(dev, "wd")) {
     88 		device_t bdev, cdev;
     89 
     90 		bdev = device_parent(dev);
     91 		if (!device_is_a(bdev, "atabus"))
     92 			return;
     93 		cdev = device_parent(bdev);
     94 		if (!device_is_a(cdev, "wdc"))
     95 			return;
     96 
     97 		if (device_unit(dev) == bootunit)
     98 			booted_device = dev;
     99 	}
    100 }
    101 
    102 /*
    103  * Attempt to find the device from which we were booted.
    104  * If we can do so, and not instructed not to do so,
    105  * change rootdev to correspond to the load device.
    106  */
    107 static void
    108 findroot(void)
    109 {
    110 	struct btinfo_bootdev *bi;
    111 	int x, p;
    112 
    113 	bi = (struct btinfo_bootdev *)lookup_bootinfo(BTINFO_BOOTDEV);
    114 	if (bi == NULL)
    115 		return;
    116 	x = strlen(bi->bootdev) - 2;
    117 	p = strlen(bi->bootdev) - 1;
    118 	if (!isdigit(bi->bootdev[x]) ||
    119 	    !isalpha(bi->bootdev[p]))
    120 		return;			/* bad format */
    121 
    122 	bootunit = bi->bootdev[x] - '0';
    123 	booted_partition = bi->bootdev[p] - 'a';
    124 }
    125