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obio.c revision 1.2 
      1 /*	$NetBSD: obio.c,v 1.2 1994/09/17 23:49:58 deraadt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993, 1994 Theo de Raadt
      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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Theo de Raadt.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/param.h>
     34 #include <sys/device.h>
     35 #include <sys/malloc.h>
     36 
     37 #ifdef DEBUG
     38 #include <sys/proc.h>
     39 #include <sys/syslog.h>
     40 #endif
     41 
     42 #include <vm/vm.h>
     43 
     44 #include <machine/autoconf.h>
     45 #include <machine/pmap.h>
     46 #include <machine/oldmon.h>
     47 #include <machine/ctlreg.h>
     48 #include <sparc/sparc/asm.h>
     49 #include <sparc/sparc/vaddrs.h>
     50 
     51 struct obio_softc {
     52 	struct	device sc_dev;		/* base device */
     53 	int	nothing;
     54 };
     55 
     56 /* autoconfiguration driver */
     57 static int	obiomatch(struct device *, struct cfdata *, void *);
     58 static void	obioattach(struct device *, struct device *, void *);
     59 struct cfdriver obiocd = { NULL, "cgsix", obiomatch, obioattach,
     60 	DV_DULL, sizeof(struct obio_softc)
     61 };
     62 
     63 void *		obio_map __P((void *, int));
     64 void *		obio_tmp_map __P((void *));
     65 void		obio_tmp_unmap __P((void));
     66 
     67 int
     68 obiomatch(parent, cf, args)
     69 	struct device *parent;
     70 	struct cfdata *cf;
     71 	void *args;
     72 {
     73 	/*
     74 	 * This exists for machines that don't have OpenPROM.
     75 	 */
     76 	if (cputyp != CPU_SUN4)
     77 		return 0;
     78 	return 1;
     79 }
     80 
     81 int
     82 obio_print(args, obio)
     83 	void *args;
     84 	char *obio;
     85 {
     86 	register struct confargs *ca = args;
     87 
     88 	if (ca->ca_ra.ra_name == NULL)
     89 		ca->ca_ra.ra_name = "<unknown>";
     90 	if (obio)
     91 		printf("%s at %s", ca->ca_ra.ra_name, obio);
     92 	printf(" slot %d offset 0x%x", ca->ca_slot, ca->ca_offset);
     93 	return (UNCONF);
     94 }
     95 
     96 void
     97 obioattach(parent, self, aux)
     98 	struct device *parent, *self;
     99 	void *aux;
    100 {
    101 	register struct obio_softc *sc = (struct obio_softc *)self;
    102 	extern struct cfdata cfdata[];
    103 	struct confargs ca;
    104 	register short *p;
    105 	struct cfdata *cf;
    106 
    107 	if (sc->sc_dev.dv_unit > 0) {
    108 		printf(" unsupported\n");
    109 		return;
    110 	}
    111 
    112 	for (cf = cfdata; cf->cf_driver; cf++) {
    113 		if (cf->cf_fstate == FSTATE_FOUND)
    114 			continue;
    115 		for (p = cf->cf_parents; *p >= 0; p++)
    116 			if (parent->dv_cfdata == &cfdata[*p]) {
    117 				ca.ca_ra.ra_iospace = -1;
    118 				ca.ca_ra.ra_paddr = (void *)cf->cf_loc[0];
    119 				ca.ca_ra.ra_len = 0;
    120 				ca.ca_ra.ra_vaddr = obio_tmp_map(ca.ca_ra.ra_paddr);
    121 				ca.ca_ra.ra_intr[0].int_pri = cf->cf_loc[1];
    122 				ca.ca_ra.ra_intr[0].int_vec = 0;
    123 				ca.ca_ra.ra_nintr = 1;
    124 				if ((*cf->cf_driver->cd_match)(self, cf, &ca) == 0)
    125 					continue;
    126 
    127 				if (ca.ca_ra.ra_len)
    128 					ca.ca_ra.ra_vaddr =
    129 					    obio_map(ca.ca_ra.ra_paddr,
    130 					    ca.ca_ra.ra_len);
    131 				ca.ca_bustype = BUS_OBIO;
    132 				config_attach(self, cf, &ca, NULL);
    133 			}
    134 	}
    135 	obio_tmp_unmap();
    136 }
    137 
    138 #define	getpte(va)		lda(va, ASI_PTE)
    139 
    140 /*
    141  * If we can find a mapping that was established by the rom, use it.
    142  * Else, create a new mapping.
    143  */
    144 void *
    145 obio_map(pa, len)
    146 	void *pa;
    147 	int len;
    148 {
    149 	u_long	pf = (int)pa >> PGSHIFT;
    150 	u_long	va, pte;
    151 
    152 	for (va = MONSTART; va < MONEND; va += NBPG) {
    153 		pte = getpte(va);
    154 		if ((pte & PG_V) != 0 && (pte & PG_TYPE) == PG_OBIO &&
    155 		    (pte & PG_PFNUM) == pf)
    156 			return ((void *)va);
    157 	}
    158 	return mapiodev(pa, len);
    159 }
    160 
    161 void *
    162 obio_tmp_map(pa)
    163 	void *pa;
    164 {
    165 	pmap_enter(kernel_pmap, TMPMAP_VA,
    166 	    (vm_offset_t)pa | PMAP_OBIO | PMAP_NC,
    167 	    VM_PROT_READ | VM_PROT_WRITE, 1);
    168 	return ((void *)TMPMAP_VA);
    169 }
    170 
    171 void
    172 obio_tmp_unmap()
    173 {
    174 	pmap_remove(kernel_pmap, TMPMAP_VA, TMPMAP_VA+NBPG);
    175 }
    176