sys/arch/alpha/pci/apecs_pci.c

   1 /* $NetBSD: apecs_pci.c,v 1.21 2009/03/14 15:35:59 dsl 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@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 1.21 2009/03/14 15:35:59 dsl 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 <uvm/uvm_extern.h>
  40
  41 #include <dev/pci/pcireg.h>
  42 #include <dev/pci/pcivar.h>
  43 #include <alpha/pci/apecsreg.h>
  44 #include <alpha/pci/apecsvar.h>
  45
  46 void            apecs_attach_hook(struct device *, struct device *,
  47                     struct pcibus_attach_args *);
  48 int             apecs_bus_maxdevs(void *, int);
  49 pcitag_t        apecs_make_tag(void *, int, int, int);
  50 void            apecs_decompose_tag(void *, pcitag_t, int *, int *,
  51                     int *);
  52 pcireg_t        apecs_conf_read(void *, pcitag_t, int);
  53 void            apecs_conf_write(void *, pcitag_t, int, pcireg_t);
  54
  55 void
  56 apecs_pci_init(pci_chipset_tag_t pc, void *v)
  57 {
  58
  59         pc->pc_conf_v = v;
  60         pc->pc_attach_hook = apecs_attach_hook;
  61         pc->pc_bus_maxdevs = apecs_bus_maxdevs;
  62         pc->pc_make_tag = apecs_make_tag;
  63         pc->pc_decompose_tag = apecs_decompose_tag;
  64         pc->pc_conf_read = apecs_conf_read;
  65         pc->pc_conf_write = apecs_conf_write;
  66 }
  67
  68 void
  69 apecs_attach_hook(struct device *parent, struct device *self, struct pcibus_attach_args *pba)
  70 {
  71 }
  72
  73 int
  74 apecs_bus_maxdevs(void *cpv, int busno)
  75 {
  76
  77         return 32;
  78 }
  79
  80 pcitag_t
  81 apecs_make_tag(void *cpv, int b, int d, int f)
  82 {
  83
  84         return (b << 16) | (d << 11) | (f << 8);
  85 }
  86
  87 void
  88 apecs_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
  89 {
  90
  91         if (bp != NULL)
  92                 *bp = (tag >> 16) & 0xff;
  93         if (dp != NULL)
  94                 *dp = (tag >> 11) & 0x1f;
  95         if (fp != NULL)
  96                 *fp = (tag >> 8) & 0x7;
  97 }
  98
  99 pcireg_t
 100 apecs_conf_read(void *cpv, pcitag_t tag, int offset)
 101 {
 102         struct apecs_config *acp = cpv;
 103         pcireg_t *datap, data;
 104         int s, secondary, ba;
 105         int32_t old_haxr2;                                      /* XXX */
 106
 107         s = 0;                                  /* XXX gcc -Wuninitialized */
 108         old_haxr2 = 0;                          /* XXX gcc -Wuninitialized */
 109
 110         /* secondary if bus # != 0 */
 111         pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
 112         if (secondary) {
 113                 s = splhigh();
 114                 old_haxr2 = REGVAL(EPIC_HAXR2);
 115                 alpha_mb();
 116                 REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
 117                 alpha_mb();
 118         }
 119
 120         datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
 121             tag << 5UL |                                        /* XXX */
 122             (offset & ~0x03) << 5 |                             /* XXX */
 123             0 << 5 |                                            /* XXX */
 124             0x3 << 3);                                          /* XXX */
 125         data = (pcireg_t)-1;
 126         if (!(ba = badaddr(datap, sizeof *datap)))
 127                 data = *datap;
 128
 129         if (secondary) {
 130                 alpha_mb();
 131                 REGVAL(EPIC_HAXR2) = old_haxr2;
 132                 alpha_mb();
 133                 splx(s);
 134         }
 135
 136 #if 0
 137         printf("apecs_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
 138             data, datap, ba ? " (badaddr)" : "");
 139 #endif
 140
 141         return data;
 142 }
 143
 144 void
 145 apecs_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
 146 {
 147         struct apecs_config *acp = cpv;
 148         pcireg_t *datap;
 149         int s, secondary;
 150         int32_t old_haxr2;                                      /* XXX */
 151
 152         s = 0;                                  /* XXX gcc -Wuninitialized */
 153         old_haxr2 = 0;                          /* XXX gcc -Wuninitialized */
 154
 155         /* secondary if bus # != 0 */
 156         pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
 157         if (secondary) {
 158                 s = splhigh();
 159                 old_haxr2 = REGVAL(EPIC_HAXR2);
 160                 alpha_mb();
 161                 REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
 162                 alpha_mb();
 163         }
 164
 165         datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
 166             tag << 5UL |                                        /* XXX */
 167             (offset & ~0x03) << 5 |                             /* XXX */
 168             0 << 5 |                                            /* XXX */
 169             0x3 << 3);                                          /* XXX */
 170
 171         alpha_mb();
 172         *datap = data;
 173         alpha_mb();
 174         alpha_mb();
 175
 176         if (secondary) {
 177                 alpha_mb();
 178                 REGVAL(EPIC_HAXR2) = old_haxr2;
 179                 alpha_mb();
 180                 splx(s);
 181         }
 182
 183 #if 0
 184         printf("apecs_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
 185             reg, data, datap);
 186 #endif
 187 }