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imc.c revision 1.2 
      1 /*	$NetBSD: imc.c,v 1.2 2001/07/08 23:59:31 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Rafal K. Boni
      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  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/param.h>
     31 #include <sys/device.h>
     32 #include <sys/systm.h>
     33 
     34 #include <machine/cpu.h>
     35 #include <machine/locore.h>
     36 #include <machine/autoconf.h>
     37 #include <machine/bus.h>
     38 #include <machine/machtype.h>
     39 
     40 #include "locators.h"
     41 
     42 struct imc_softc {
     43 	struct device sc_dev;
     44 
     45 	int eisa_present : 1;
     46 };
     47 
     48 static int	imc_match(struct device *, struct cfdata *, void *);
     49 static void	imc_attach(struct device *, struct device *, void *);
     50 static int	imc_print(void *, const char *);
     51 
     52 struct cfattach imc_ca = {
     53 	sizeof(struct imc_softc), imc_match, imc_attach
     54 };
     55 
     56 struct imc_attach_args {
     57 	const char* iaa_name;
     58 
     59 	bus_space_tag_t iaa_st;
     60 	bus_space_handle_t iaa_sh;
     61 
     62 /* ? */
     63         long	iaa_offset;
     64         int	iaa_intr;
     65 #if 0
     66         int	iaa_stride;
     67 #endif
     68 };
     69 
     70 static int
     71 imc_match(parent, match, aux)
     72 	struct device *parent;
     73 	struct cfdata *match;
     74 	void *aux;
     75 {
     76 
     77 	/*
     78 	 * The IMC is an INDY/INDIGO2 thing.
     79 	 */
     80 	if (mach_type != MACH_SGI_IP22)
     81 		return (0);
     82 
     83 	/* Make sure it's actually there and readable */
     84 	if (badaddr((void*)MIPS_PHYS_TO_KSEG1(0x1fa0001c), sizeof(u_int32_t)))
     85 		return (0);
     86 
     87 	return (1);
     88 }
     89 
     90 static void
     91 imc_attach(parent, self, aux)
     92 	struct device *parent;
     93 	struct device *self;
     94 	void *aux;
     95 {
     96 	u_int32_t reg;
     97 	struct imc_attach_args iaa;
     98 	struct imc_softc *isc = (void *) self;
     99         u_int32_t sysid = *(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa0001c);
    100 
    101 	isc->eisa_present = (sysid >> 4) & 1;
    102 
    103 	printf("\nimc0: Revision %d", (sysid & 0x03));
    104 
    105 	if (isc->eisa_present)
    106 	    printf(", EISA bus present");
    107 
    108 	printf("\n");
    109 
    110 	/* Clear CPU/GIO error status registers to clear any leftover bits. */
    111 	*(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa000ec) = 0;
    112 	*(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa000fc) = 0;
    113 
    114 	/*
    115 	 * Enable parity reporting on memory/GIO accesses, turn off parity
    116 	 * checking on CPU reads from memory (flags cribbed from Linux --
    117 	 * why is the last one off?).  Also, enable MC interrupt writes to
    118 	 * the CPU.
    119 	 */
    120 	reg = *(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa00004);
    121 	reg |= 0x4002060;
    122 	*(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa00004) = reg;
    123 
    124 	/* Setup the MC write buffer depth */
    125 	reg = *(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa0000c);
    126 	reg &= ~0xf;
    127 	reg |= 0xd;
    128 	*(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa0000c) = reg;
    129 
    130 	/* Set GIO64 arbitrator configuration register. */
    131 
    132 	/* GIO64 invariant for all IP22 platforms: one GIO bus, HPC1 @ 64 */
    133 	reg = 0x401;
    134 
    135 	/* XXXrkb: I2 setting for now */
    136 	reg |= 0xc222;	/* GFX, HPC2 @ 64, EXP1,2 pipelined, EISA masters */
    137 	*(volatile u_int32_t *)MIPS_PHYS_TO_KSEG1(0x1fa00084) = reg;
    138 
    139 	if (isc->eisa_present) {
    140 #if notyet
    141 	    memset(&iaa, 0, sizeof(iaa));
    142 
    143 	    iaa.iaa_name = "eisa";
    144 	    (void)config_found(self, (void*)&iaa, imc_print);
    145 #endif
    146 	}
    147 
    148 	memset(&iaa, 0, sizeof(iaa));
    149 
    150 	iaa.iaa_name = "gio";
    151 	(void)config_found(self, (void*)&iaa, imc_print);
    152 }
    153 
    154 
    155 static int
    156 imc_print(aux, name)
    157 	void *aux;
    158 	const char *name;
    159 {
    160 	struct imc_attach_args* iaa = aux;
    161 
    162 	if (name)
    163 		printf("%s at %s", iaa->iaa_name, name);
    164 
    165 	return UNCONF;
    166 }
    167 
    168