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      1 /* $NetBSD: apecs_pci.c,v 1.28 2021/06/25 03:45:59 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: apecs_pci.c,v 1.28 2021/06/25 03:45:59 thorpej Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/kernel.h>
     37 #include <sys/device.h>
     38 
     39 #include <dev/pci/pcireg.h>
     40 #include <dev/pci/pcivar.h>
     41 #include <alpha/pci/apecsreg.h>
     42 #include <alpha/pci/apecsvar.h>
     43 
     44 static pcireg_t	apecs_conf_read(void *, pcitag_t, int);
     45 static void	apecs_conf_write(void *, pcitag_t, int, pcireg_t);
     46 
     47 void
     48 apecs_pci_init(pci_chipset_tag_t pc, void *v)
     49 {
     50 
     51 	pc->pc_conf_v = v;
     52 	pc->pc_conf_read = apecs_conf_read;
     53 	pc->pc_conf_write = apecs_conf_write;
     54 }
     55 
     56 static pcireg_t
     57 apecs_conf_read(void *cpv, pcitag_t tag, int offset)
     58 {
     59 	struct apecs_config *acp = cpv;
     60 	pcireg_t *datap, data;
     61 	int s, secondary, ba;
     62 	int32_t old_haxr2;					/* XXX */
     63 
     64 	if ((unsigned int)offset >= PCI_CONF_SIZE)
     65 		return (pcireg_t) -1;
     66 
     67 	s = 0;					/* XXX gcc -Wuninitialized */
     68 	old_haxr2 = 0;				/* XXX gcc -Wuninitialized */
     69 
     70 	/* secondary if bus # != 0 */
     71 	pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
     72 	if (secondary) {
     73 		s = splhigh();
     74 		old_haxr2 = REGVAL(EPIC_HAXR2);
     75 		alpha_mb();
     76 		REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
     77 		alpha_mb();
     78 	}
     79 
     80 	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
     81 	    tag << 5UL |					/* XXX */
     82 	    (offset & ~0x03) << 5 |				/* XXX */
     83 	    0 << 5 |						/* XXX */
     84 	    0x3 << 3);						/* XXX */
     85 	data = (pcireg_t)-1;
     86 	if (!(ba = badaddr(datap, sizeof *datap)))
     87 		data = *datap;
     88 
     89 	if (secondary) {
     90 		alpha_mb();
     91 		REGVAL(EPIC_HAXR2) = old_haxr2;
     92 		alpha_mb();
     93 		splx(s);
     94 	}
     95 
     96 #if 0
     97 	printf("apecs_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
     98 	    data, datap, ba ? " (badaddr)" : "");
     99 #endif
    100 
    101 	return data;
    102 }
    103 
    104 static void
    105 apecs_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
    106 {
    107 	struct apecs_config *acp = cpv;
    108 	pcireg_t *datap;
    109 	int s, secondary;
    110 	int32_t old_haxr2;					/* XXX */
    111 
    112 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    113 		return;
    114 
    115 	s = 0;					/* XXX gcc -Wuninitialized */
    116 	old_haxr2 = 0;				/* XXX gcc -Wuninitialized */
    117 
    118 	/* secondary if bus # != 0 */
    119 	pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
    120 	if (secondary) {
    121 		s = splhigh();
    122 		old_haxr2 = REGVAL(EPIC_HAXR2);
    123 		alpha_mb();
    124 		REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
    125 		alpha_mb();
    126 	}
    127 
    128 	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
    129 	    tag << 5UL |					/* XXX */
    130 	    (offset & ~0x03) << 5 |				/* XXX */
    131 	    0 << 5 |						/* XXX */
    132 	    0x3 << 3);						/* XXX */
    133 
    134 	alpha_mb();
    135 	*datap = data;
    136 	alpha_mb();
    137 	alpha_mb();
    138 
    139 	if (secondary) {
    140 		alpha_mb();
    141 		REGVAL(EPIC_HAXR2) = old_haxr2;
    142 		alpha_mb();
    143 		splx(s);
    144 	}
    145 
    146 #if 0
    147 	printf("apecs_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
    148 	    reg, data, datap);
    149 #endif
    150 }
    151