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      1 /*	$NetBSD: mainbus.c,v 1.10 2026/08/09 22:21:41 andvar Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2014 Michael Lorenz
      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: mainbus.c,v 1.10 2026/08/09 22:21:41 andvar Exp $");
     31 
     32 #include "opt_ingenic.h"
     33 #include "opt_multiprocessor.h"
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/device.h>
     38 
     39 #include <mips/cache.h>
     40 #include <mips/cpuregs.h>
     41 
     42 #include <mips/ingenic/ingenic_regs.h>
     43 #ifdef INGENIC_DEBUG
     44 #include <mips/ingenic/ingenic_var.h>
     45 #endif
     46 
     47 #include "locators.h"
     48 
     49 static int	mainbus_match(device_t, cfdata_t, void *);
     50 static void	mainbus_attach(device_t, device_t, void *);
     51 static int	mainbus_print(void *, const char *);
     52 
     53 CFATTACH_DECL_NEW(mainbus, 0,
     54     mainbus_match, mainbus_attach, NULL, NULL);
     55 
     56 /* There can be only one. */
     57 int	mainbus_found = 0;
     58 
     59 struct mainbusdev {
     60 	const char *md_name;
     61 };
     62 
     63 struct mainbusdev mainbusdevs[] = {
     64 	{ "cpu",	},
     65 #ifdef MULTIPROCESSOR
     66 	{ "cpu",	},
     67 #endif
     68 	{ "apbus",	},
     69 	{ NULL,		}
     70 };
     71 
     72 static int
     73 mainbus_match(device_t parent, cfdata_t match, void *aux)
     74 {
     75 
     76 	if (mainbus_found)
     77 		return (0);
     78 
     79 	return (1);
     80 }
     81 
     82 static void
     83 mainbus_attach(device_t parent, device_t self, void *aux)
     84 {
     85 	const struct mainbusdev *md;
     86 
     87 	mainbus_found = 1;
     88 	printf("\n");
     89 
     90 	for (md = mainbusdevs; md->md_name != NULL; md++) {
     91 		struct mainbusdev ma = *md;
     92 		config_found(self, &ma, mainbus_print, CFARGS_NONE);
     93 	}
     94 
     95 #ifdef INGENIC_DEBUG
     96 	printf("TFR: %08x\n", readreg(JZ_TC_TFR));
     97 	printf("TMR: %08x\n", readreg(JZ_TC_TMR));
     98 
     99 	/* send ourselves an IPI */
    100 	mips_cp0_corembox_write(0x12345678, 0);
    101 	delay(1000);
    102 
    103 	/* send the other core an IPI */
    104 	mips_cp0_corembox_write(0x12345678, 1);
    105 	delay(1000);
    106 #endif
    107 }
    108 
    109 static int
    110 mainbus_print(void *aux, const char *pnp)
    111 {
    112 
    113 	return (QUIET);
    114 }
    115