sys/arch/alpha/pci/ttwoga_pci.c

   1 /* $NetBSD: ttwoga_pci.c,v 1.3 2008/01/05 00:31:51 ad Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1999, 2000 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 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  33
  34 __KERNEL_RCSID(0, "$NetBSD: ttwoga_pci.c,v 1.3 2008/01/05 00:31:51 ad Exp $");
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/device.h>
  40 #include <sys/simplelock.h>
  41
  42 #include <dev/pci/pcireg.h>
  43 #include <dev/pci/pcivar.h>
  44
  45 #include <alpha/pci/ttwogareg.h>
  46 #include <alpha/pci/ttwogavar.h>
  47
  48 void            ttwoga_attach_hook(struct device *, struct device *,
  49                     struct pcibus_attach_args *);
  50 int             ttwoga_bus_maxdevs(void *, int);
  51 pcitag_t        ttwoga_make_tag(void *, int, int, int);
  52 void            ttwoga_decompose_tag(void *, pcitag_t, int *, int *,
  53                     int *);
  54 pcireg_t        ttwoga_conf_read(void *, pcitag_t, int);
  55 void            ttwoga_conf_write(void *, pcitag_t, int, pcireg_t);
  56
  57 paddr_t         ttwoga_make_type0addr(int, int);
  58
  59 /*
  60  * The T2 has an annoying bug that can manifest itself while
  61  * probing for devices.  If a non-existent CBUS address is
  62  * accessed with a read, "a few" subsequent write cycles
  63  * will generate spurious memory errors.  We work around this
  64  * by tracking which CPU has the PCI configuration mutex and
  65  * "expect" machine checks on that CPU for the duraction of
  66  * the PCI configuration access routine.
  67  */
  68
  69 struct simplelock ttwoga_conf_slock;
  70 cpuid_t ttwoga_conf_cpu;                /* XXX core logic bug */
  71
  72 #define TTWOGA_CONF_LOCK(s)                                             \
  73 do {                                                                    \
  74         (s) = splhigh();                                                \
  75         simple_lock(&ttwoga_conf_slock);                                \
  76         ttwoga_conf_cpu = cpu_number();                                 \
  77 } while (0)
  78
  79 #define TTWOGA_CONF_UNLOCK(s)                                           \
  80 do {                                                                    \
  81         ttwoga_conf_cpu = (cpuid_t)-1;                                  \
  82         simple_unlock(&ttwoga_conf_slock);                              \
  83         splx((s));                                                      \
  84 } while (0)
  85
  86 void
  87 ttwoga_pci_init(pci_chipset_tag_t pc, void *v)
  88 {
  89
  90         simple_lock_init(&ttwoga_conf_slock);
  91
  92         pc->pc_conf_v = v;
  93         pc->pc_attach_hook = ttwoga_attach_hook;
  94         pc->pc_bus_maxdevs = ttwoga_bus_maxdevs;
  95         pc->pc_make_tag = ttwoga_make_tag;
  96         pc->pc_decompose_tag = ttwoga_decompose_tag;
  97         pc->pc_conf_read = ttwoga_conf_read;
  98         pc->pc_conf_write = ttwoga_conf_write;
  99 }
 100
 101 void
 102 ttwoga_attach_hook(struct device *parent, struct device *self,
 103     struct pcibus_attach_args *pba)
 104 {
 105 }
 106
 107 int
 108 ttwoga_bus_maxdevs(void *cpv, int busno)
 109 {
 110
 111         return 32;
 112 }
 113
 114 pcitag_t
 115 ttwoga_make_tag(void *cpv, int b, int d, int f)
 116 {
 117
 118         /* This is the format used for Type 1 configuration cycles. */
 119         return (b << 16) | (d << 11) | (f << 8);
 120 }
 121
 122 void
 123 ttwoga_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
 124 {
 125
 126         if (bp != NULL)
 127                 *bp = (tag >> 16) & 0xff;
 128         if (dp != NULL)
 129                 *dp = (tag >> 11) & 0x1f;
 130         if (fp != NULL)
 131                 *fp = (tag >> 8) & 0x7;
 132 }
 133
 134 paddr_t
 135 ttwoga_make_type0addr(int d, int f)
 136 {
 137
 138         if (d > 8)                      /* XXX ??? */
 139                 return ((paddr_t) -1);
 140         return ((0x0800UL << d) | (f << 8));
 141 }
 142
 143 pcireg_t
 144 ttwoga_conf_read(void *cpv, pcitag_t tag, int offset)
 145 {
 146         struct ttwoga_config *tcp = cpv;
 147         pcireg_t *datap, data;
 148         int s, b, d, f, ba;
 149         paddr_t addr;
 150         u_int64_t old_hae3;
 151
 152         pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f);
 153
 154         addr = b ? tag : ttwoga_make_type0addr(d, f);
 155         if (addr == (paddr_t)-1)
 156                 return ((pcireg_t) -1);
 157
 158         TTWOGA_CONF_LOCK(s);
 159
 160         alpha_mb();
 161         old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA;
 162         T2GA(tcp, T2_HAE0_3) =
 163             old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT);
 164         alpha_mb();
 165         alpha_mb();
 166
 167         datap =
 168             (pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base |
 169             addr << 5UL |               /* address shift */
 170             (offset & ~0x03) << 5UL |   /* address shift */
 171             0x3 << 3UL);                /* 4-byte, size shift */
 172         data = (pcireg_t)-1;
 173         if (!(ba = badaddr(datap, sizeof *datap)))
 174                 data = *datap;
 175
 176         alpha_mb();
 177         T2GA(tcp, T2_HAE0_3) = old_hae3;
 178         alpha_mb();
 179         alpha_mb();
 180
 181         alpha_pal_draina();
 182         alpha_mb();
 183         alpha_mb();
 184
 185         TTWOGA_CONF_UNLOCK(s);
 186
 187 #if 0
 188         printf("ttwoga_conf_read: tag 0x%lx, reg 0x%x -> 0x%x @ %p%s\n",
 189             tag, offset, data, datap, ba ? " (badaddr)" : "");
 190 #endif
 191
 192         return (data);
 193 }
 194
 195 void
 196 ttwoga_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
 197 {
 198         struct ttwoga_config *tcp = cpv;
 199         pcireg_t *datap;
 200         int s, b, d, f;
 201         paddr_t addr;
 202         u_int64_t old_hae3;
 203
 204         pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f);
 205
 206         addr = b ? tag : ttwoga_make_type0addr(d, f);
 207         if (addr == (paddr_t)-1)
 208                 return;
 209
 210         TTWOGA_CONF_LOCK(s);
 211
 212         alpha_mb();
 213         old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA;
 214         T2GA(tcp, T2_HAE0_3) =
 215             old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT);
 216         alpha_mb();
 217         alpha_mb();
 218
 219         datap =
 220             (pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base |
 221             addr << 5UL |               /* address shift */
 222             (offset & ~0x03) << 5UL |   /* address shift */
 223             0x3 << 3UL);                /* 4-byte, size shift */
 224
 225         alpha_mb();
 226         *datap = data;
 227         alpha_mb();
 228         alpha_mb();
 229
 230         alpha_mb();
 231         T2GA(tcp, T2_HAE0_3) = old_hae3;
 232         alpha_mb();
 233         alpha_mb();
 234
 235         TTWOGA_CONF_UNLOCK(s);
 236
 237 #if 0
 238         printf("ttwoga_conf_write: tag 0x%lx, reg 0x%x -> 0x%x @ %p\n",
 239             tag, offset, data, datap);
 240 #endif
 241 }