sys/arch/mips/bonito/bonito_pci.c

   1 /*      $NetBSD: bonito_pci.c,v 1.6 2009/08/06 00:42:22 matt Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * PCI configuration space support for the Algorithmics BONITO
  34  * MIPS PCI and memory controller.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __KERNEL_RCSID(0, "$NetBSD: bonito_pci.c,v 1.6 2009/08/06 00:42:22 matt Exp $");
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/device.h>
  43
  44 #include <machine/bus.h>
  45 #include <machine/intr.h>
  46 #include <machine/locore.h>
  47
  48 #include <dev/pci/pcireg.h>
  49 #include <dev/pci/pcivar.h>
  50
  51 #include <mips/bonito/bonitoreg.h>
  52 #include <mips/bonito/bonitovar.h>
  53
  54 /*
  55  * Bonito systems are always single-processor, so this is sufficient.
  56  */
  57 #define PCI_CONF_LOCK(s)        (s) = splhigh()
  58 #define PCI_CONF_UNLOCK(s)      splx((s))
  59
  60 void            bonito_attach_hook(device_t, device_t,
  61                     struct pcibus_attach_args *);
  62 int             bonito_bus_maxdevs(void *, int);
  63 pcitag_t        bonito_make_tag(void *, int, int, int);
  64 void            bonito_decompose_tag(void *, pcitag_t, int *, int *, int *);
  65 pcireg_t        bonito_conf_read(void *, pcitag_t, int);
  66 void            bonito_conf_write(void *, pcitag_t, int, pcireg_t);
  67
  68 void
  69 bonito_pci_init(pci_chipset_tag_t pc, struct bonito_config *bc)
  70 {
  71
  72         pc->pc_conf_v = bc;
  73         pc->pc_attach_hook = bonito_attach_hook;
  74         pc->pc_bus_maxdevs = bonito_bus_maxdevs;
  75         pc->pc_make_tag = bonito_make_tag;
  76         pc->pc_decompose_tag = bonito_decompose_tag;
  77         pc->pc_conf_read = bonito_conf_read;
  78         pc->pc_conf_write = bonito_conf_write;
  79 }
  80
  81 void
  82 bonito_attach_hook(device_t parent, device_t self,
  83     struct pcibus_attach_args *pba)
  84 {
  85 }
  86
  87 int
  88 bonito_bus_maxdevs(void *v, int busno)
  89 {
  90
  91         return (32);
  92 }
  93
  94 pcitag_t
  95 bonito_make_tag(void *v, int b, int d, int f)
  96 {
  97
  98         return ((b << 16) | (d << 11) | (f << 8));
  99 }
 100
 101 void
 102 bonito_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp)
 103 {
 104
 105         if (bp != NULL)
 106                 *bp = (tag >> 16) & 0xff;
 107         if (dp != NULL)
 108                 *dp = (tag >> 11) & 0x1f;
 109         if (fp != NULL)
 110                 *fp = (tag >> 8) & 0x7;
 111 }
 112
 113 static bool
 114 bonito_conf_addr(struct bonito_config *bc, pcitag_t tag, int offset,
 115     u_int32_t *cfgoff, u_int32_t *pcimap_cfg)
 116 {
 117         int b, d, f;
 118
 119         bonito_decompose_tag(bc, tag, &b, &d, &f);
 120
 121         if (b == 0) {
 122                 if (d > (31 - bc->bc_adbase))
 123                         return true;
 124                 *cfgoff = (1UL << (d + bc->bc_adbase)) | (f << 8) | offset;
 125                 *pcimap_cfg = 0;
 126         } else {
 127                 *cfgoff = tag | offset;
 128                 *pcimap_cfg = BONITO_PCIMAPCFG_TYPE1;
 129         }
 130
 131         return false;
 132 }
 133
 134 pcireg_t
 135 bonito_conf_read(void *v, pcitag_t tag, int offset)
 136 {
 137         struct bonito_config *bc = v;
 138         pcireg_t data;
 139         u_int32_t cfgoff, dummy, pcimap_cfg;
 140         int s;
 141
 142         if (bonito_conf_addr(bc, tag, offset, &cfgoff, &pcimap_cfg))
 143                 return ((pcireg_t) -1);
 144
 145         PCI_CONF_LOCK(s);
 146
 147         /* clear aborts */
 148         REGVAL(BONITO_PCICMD) |=
 149             PCI_STATUS_MASTER_ABORT | PCI_STATUS_MASTER_TARGET_ABORT;
 150
 151         /* high 16 bits of address go into PciMapCfg register */
 152         REGVAL(BONITO_PCIMAP_CFG) = (cfgoff >> 16) | pcimap_cfg;
 153
 154         wbflush();
 155         /* Issue a read to make sure the write is posted */
 156         dummy = REGVAL(BONITO_PCIMAP_CFG);
 157
 158         /* low 16 bits of address are offset into config space */
 159         data = REGVAL(BONITO_PCICFG_BASE + (cfgoff & 0xfffc));
 160
 161         /* check for error */
 162         if (REGVAL(BONITO_PCICMD) &
 163             (PCI_STATUS_MASTER_ABORT | PCI_STATUS_MASTER_TARGET_ABORT))
 164                 data = (pcireg_t) -1;
 165
 166         PCI_CONF_UNLOCK(s);
 167
 168         return (data);
 169 }
 170
 171 void
 172 bonito_conf_write(void *v, pcitag_t tag, int offset, pcireg_t data)
 173 {
 174         struct bonito_config *vt = v;
 175         u_int32_t cfgoff, dummy, pcimap_cfg;
 176         int s;
 177
 178         if (bonito_conf_addr(vt, tag, offset, &cfgoff, &pcimap_cfg))
 179                 panic("bonito_conf_write");
 180
 181         PCI_CONF_LOCK(s);
 182
 183         /* clear aborts */
 184         REGVAL(BONITO_PCICMD) |=
 185             PCI_STATUS_MASTER_ABORT | PCI_STATUS_MASTER_TARGET_ABORT;
 186
 187         /* high 16 bits of address go into PciMapCfg register */
 188         REGVAL(BONITO_PCIMAP_CFG) = (cfgoff >> 16) | pcimap_cfg;
 189
 190         wbflush();
 191         /* Issue a read to make sure the write is posted */
 192         dummy = REGVAL(BONITO_PCIMAP_CFG);
 193
 194         /* low 16 bits of address are offset into config space */
 195         REGVAL(BONITO_PCICFG_BASE + (cfgoff & 0xfffc)) = data;
 196
 197         PCI_CONF_UNLOCK(s);
 198 }