sys/arch/alpha/pci/lca_pci.c

   1 /* $NetBSD: lca_pci.c,v 1.17 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: lca_pci.c,v 1.17 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/lcareg.h>
  44 #include <alpha/pci/lcavar.h>
  45
  46 void            lca_attach_hook(struct device *, struct device *,
  47                     struct pcibus_attach_args *);
  48 int             lca_bus_maxdevs(void *, int);
  49 pcitag_t        lca_make_tag(void *, int, int, int);
  50 void            lca_decompose_tag(void *, pcitag_t, int *, int *,
  51                     int *);
  52 pcireg_t        lca_conf_read(void *, pcitag_t, int);
  53 void            lca_conf_write(void *, pcitag_t, int, pcireg_t);
  54
  55 void
  56 lca_pci_init(pci_chipset_tag_t pc, void *v)
  57 {
  58
  59         pc->pc_conf_v = v;
  60         pc->pc_attach_hook = lca_attach_hook;
  61         pc->pc_bus_maxdevs = lca_bus_maxdevs;
  62         pc->pc_make_tag = lca_make_tag;
  63         pc->pc_decompose_tag = lca_decompose_tag;
  64         pc->pc_conf_read = lca_conf_read;
  65         pc->pc_conf_write = lca_conf_write;
  66 }
  67
  68 void
  69 lca_attach_hook(struct device *parent, struct device *self, struct pcibus_attach_args *pba)
  70 {
  71 }
  72
  73 int
  74 lca_bus_maxdevs(void *cpv, int busno)
  75 {
  76
  77         if (busno == 0)
  78                 return 16;
  79         else
  80                 return 32;
  81 }
  82
  83 pcitag_t
  84 lca_make_tag(void *cpv, int b, int d, int f)
  85 {
  86
  87         return (b << 16) | (d << 11) | (f << 8);
  88 }
  89
  90 void
  91 lca_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
  92 {
  93
  94         if (bp != NULL)
  95                 *bp = (tag >> 16) & 0xff;
  96         if (dp != NULL)
  97                 *dp = (tag >> 11) & 0x1f;
  98         if (fp != NULL)
  99                 *fp = (tag >> 8) & 0x7;
 100 }
 101
 102 pcireg_t
 103 lca_conf_read(void *cpv, pcitag_t tag, int offset)
 104 {
 105         struct lca_config *lcp = cpv;
 106         pcireg_t *datap, data;
 107         int s, secondary, device, ba;
 108
 109         s = 0;                                  /* XXX gcc -Wuninitialized */
 110
 111         /* secondary if bus # != 0 */
 112         pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &device, 0);
 113         if (secondary) {
 114                 s = splhigh();
 115                 alpha_mb();
 116                 REGVAL(LCA_IOC_CONF) = 0x01;
 117                 alpha_mb();
 118         } else {
 119                 /*
 120                  * on the LCA, must frob the tag used for
 121                  * devices on the primary bus, in the same ways
 122                  * as is used by type 1 configuration cycles
 123                  * on PCs.
 124                  */
 125                 tag = (1 << (device + 11)) | (tag & 0x7ff);
 126         }
 127
 128         datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
 129             tag << 5UL |                                        /* XXX */
 130             (offset & ~0x03) << 5 |                             /* XXX */
 131             0 << 5 |                                            /* XXX */
 132             0x3 << 3);                                          /* XXX */
 133         data = (pcireg_t)-1;
 134         if (!(ba = badaddr(datap, sizeof *datap)))
 135                 data = *datap;
 136
 137         if (secondary) {
 138                 alpha_mb();
 139                 REGVAL(LCA_IOC_CONF) = 0x00;
 140                 alpha_mb();
 141                 splx(s);
 142         }
 143
 144 #if 0
 145         printf("lca_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
 146             data, datap, ba ? " (badaddr)" : "");
 147 #endif
 148
 149         return data;
 150 }
 151
 152 void
 153 lca_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
 154 {
 155         struct lca_config *lcp = cpv;
 156         pcireg_t *datap;
 157         int s, secondary, device;
 158
 159         s = 0;                                  /* XXX gcc -Wuninitialized */
 160
 161         /* secondary if bus # != 0 */
 162         pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &device, 0);
 163         if (secondary) {
 164                 s = splhigh();
 165                 alpha_mb();
 166                 REGVAL(LCA_IOC_CONF) = 0x01;
 167                 alpha_mb();
 168         } else {
 169                 /*
 170                  * on the LCA, must frob the tag used for
 171                  * devices on the primary bus, in the same ways
 172                  * as is used by type 1 configuration cycles
 173                  * on PCs.
 174                  */
 175                 tag = (1 << (device + 11)) | (tag & 0x7ff);
 176         }
 177
 178         datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
 179             tag << 5UL |                                        /* XXX */
 180             (offset & ~0x03) << 5 |                             /* XXX */
 181             0 << 5 |                                            /* XXX */
 182             0x3 << 3);                                          /* XXX */
 183         *datap = data;
 184
 185         if (secondary) {
 186                 alpha_mb();
 187                 REGVAL(LCA_IOC_CONF) = 0x00;
 188                 alpha_mb();
 189                 splx(s);
 190         }
 191
 192 #if 0
 193         printf("lca_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
 194             reg, data, datap);
 195 #endif
 196 }