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      1 /*	$NetBSD: machdep.c,v 1.52 2021/08/03 09:25:43 rin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Juergen Hannken-Illjes.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.52 2021/08/03 09:25:43 rin Exp $");
     34 
     35 #include "opt_explora.h"
     36 
     37 #include <sys/param.h>
     38 #include <sys/bus.h>
     39 #include <sys/kernel.h>
     40 #include <sys/module.h>
     41 #include <sys/systm.h>
     42 
     43 #include <prop/proplib.h>
     44 
     45 #include <machine/explora.h>
     46 
     47 #include <powerpc/spr.h>
     48 #include <powerpc/ibm4xx/spr.h>
     49 
     50 #include <powerpc/ibm4xx/cpu.h>
     51 #include <powerpc/ibm4xx/dcr403cgx.h>
     52 #include <powerpc/ibm4xx/tlb.h>
     53 
     54 #define TLB_PG_SIZE	(16*1024*1024)
     55 
     56 static const unsigned int cpuspeed = 66000000;
     57 
     58 void		initppc(vaddr_t, vaddr_t);
     59 
     60 void
     61 initppc(vaddr_t startkernel, vaddr_t endkernel)
     62 {
     63 	u_int i, j, t, br[4];
     64 	u_int maddr, msize, size;
     65 
     66 	br[0] = mfdcr(DCR_BR4);
     67 	br[1] = mfdcr(DCR_BR5);
     68 	br[2] = mfdcr(DCR_BR6);
     69 	br[3] = mfdcr(DCR_BR7);
     70 
     71 	for (i = 0; i < 4; i++)
     72 		for (j = i+1; j < 4; j++)
     73 			if (br[j] < br[i])
     74 				t = br[j], br[j] = br[i], br[i] = t;
     75 
     76 	for (i = 0, size = 0; i < 4; i++) {
     77 		if (((br[i] >> 19) & 3) != 3)
     78 			continue;
     79 		maddr = ((br[i] >> 24) & 0xff) << 20;
     80 		msize = 1 << (20 + ((br[i] >> 21) & 7));
     81 		if (maddr + msize > size)
     82 			size = maddr + msize;
     83 	}
     84 
     85 	/*
     86 	 * Setup initial tlbs.
     87 	 * Kernel memory and console device are
     88 	 * mapped into the first (reserved) tlbs.
     89 	 */
     90 
     91 	for (maddr = 0; maddr < endkernel; maddr += TLB_PG_SIZE)
     92 		ppc4xx_tlb_reserve(maddr, maddr, TLB_PG_SIZE, TLB_EX);
     93 
     94 	/* Map PCKBC, PCKBC2, COM, LPT. This is far beyond physmem. */
     95 	ppc4xx_tlb_reserve(BASE_ISA, BASE_ISA, TLB_PG_SIZE, TLB_I | TLB_G);
     96 
     97 #ifndef COM_IS_CONSOLE
     98 	ppc4xx_tlb_reserve(BASE_FB,  BASE_FB,  TLB_PG_SIZE, TLB_I | TLB_G);
     99 	ppc4xx_tlb_reserve(BASE_FB2, BASE_FB2, TLB_PG_SIZE, TLB_I | TLB_G);
    100 #endif
    101 
    102 	/* Disable all external interrupts */
    103 	mtdcr(DCR_EXIER, 0);
    104 
    105 	/* Disable all timer interrupts */
    106 	mtspr(SPR_TCR, 0);
    107 
    108 	ibm40x_memsize_init(size, startkernel);
    109 	ibm4xx_init(startkernel, endkernel, pic_ext_intr);
    110 }
    111 
    112 void
    113 cpu_startup(void)
    114 {
    115 	prop_number_t pn;
    116 
    117 	/*
    118 	 * cpu common startup
    119 	 */
    120 	ibm4xx_cpu_startup("NCD Explora 450");
    121 
    122 	/*
    123 	 * Set up the board properties database.
    124 	 */
    125 	board_info_init();
    126 
    127 	pn = prop_number_create_integer(ctob(physmem));
    128 	KASSERT(pn != NULL);
    129 	if (prop_dictionary_set(board_properties, "mem-size", pn) == false)
    130 		panic("setting mem-size");
    131 	prop_object_release(pn);
    132 
    133 	pn = prop_number_create_integer(cpuspeed);
    134 	KASSERT(pn != NULL);
    135 	if (prop_dictionary_set(board_properties, "processor-frequency",
    136 				pn) == false)
    137 		panic("setting processor-frequency");
    138 	prop_object_release(pn);
    139 
    140 	/*
    141 	 * Now that we have VM, malloc()s are OK in bus_space.
    142 	 */
    143 	bus_space_mallocok();
    144 
    145 	/*
    146 	 * no fake mapiodev
    147 	 */
    148 	fake_mapiodev = 0;
    149 }
    150