sys/arch/prep/pci/prep_pciconf_direct.c

   1 /*      $NetBSD: prep_pciconf_direct.c,v 1.5.24.2 2007/05/10 15:46:08 garbled Exp $     */
   2
   3 /*
   4  * Copyright (c) 2002 Klaus J. Klein.  All rights reserved.
   5  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
   6  * Copyright (c) 1994 Charles M. Hannum.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Charles M. Hannum.
  19  * 4. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Machine-specific functions for PCI autoconfiguration.
  36  *
  37  * This version is specific to the direct-mapped configuration space access
  38  * such as implemented on the IBM 27-82650 PCI Bridge/Memory Controller.
  39  */
  40
  41 #include <sys/cdefs.h>
  42 __KERNEL_RCSID(0, "$NetBSD: prep_pciconf_direct.c,v 1.5.24.2 2007/05/10 15:46:08 garbled Exp $");
  43
  44 #include <sys/types.h>
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/systm.h>
  48 #include <sys/errno.h>
  49 #include <sys/device.h>
  50
  51 #include <uvm/uvm_extern.h>
  52
  53 #define _POWERPC_BUS_DMA_PRIVATE
  54 #include <machine/bus.h>
  55 #include <machine/intr.h>
  56 #include <machine/platform.h>
  57
  58 #include <powerpc/pio.h>
  59
  60 #include <dev/isa/isavar.h>
  61 #include <dev/pci/pcivar.h>
  62 #include <dev/pci/pcireg.h>
  63 #include <dev/pci/pcidevs.h>
  64
  65 #include <prop/proplib.h>
  66
  67 #ifdef DEBUG
  68 #define        DPRINTF(x) aprint_debug x
  69 #else
  70 #define        DPRINTF(x)
  71 #endif
  72
  73 /* Physical base address and size of PCI configuration space. */
  74 #define PCI_DCONF_BASE          0x80800000
  75 #define PCI_DCONF_SIZE          0x00800000
  76 /* Device function selection. */
  77 #define PCI_DCONF_FUNC          0x00000700
  78 #define PCI_DCONF_FUNC_SHIFT    8
  79 /* Configuration space register selection. */
  80 #define PCI_DCONF_REG           0x000000ff
  81 #define PCI_DCONF_REG_SHIFT     0
  82 /* Device selection; those bits still available. */
  83 #define PCI_DCONF_DEV  \
  84     (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG))
  85
  86 void prep_pci_direct_attach_hook(struct device *, struct device *,
  87     struct pcibus_attach_args *);
  88 pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
  89 pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
  90 void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t);
  91 void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *);
  92
  93 void
  94 prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc)
  95 {
  96
  97         pc->pc_conf_v = NULL;
  98
  99         pc->pc_attach_hook = prep_pci_direct_attach_hook;
 100         pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
 101         pc->pc_make_tag = prep_pci_direct_make_tag;
 102         pc->pc_conf_read = prep_pci_direct_conf_read;
 103         pc->pc_conf_write = prep_pci_direct_conf_write;
 104
 105         pc->pc_intr_v = NULL;
 106
 107         pc->pc_intr_map = prep_pci_intr_map;
 108         pc->pc_intr_string = genppc_pci_intr_string;
 109         pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
 110         pc->pc_intr_establish = genppc_pci_intr_establish;
 111         pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
 112
 113         pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
 114         pc->pc_decompose_tag = prep_pci_direct_decompose_tag;
 115         pc->pc_conf_hook = prep_pci_conf_hook;
 116 }
 117
 118 void
 119 prep_pci_direct_attach_hook(struct device *parent, struct device *self,
 120     struct pcibus_attach_args *pba)
 121 {
 122
 123         if (pba->pba_bus == 0)
 124                 aprint_normal(": direct-mapped configuration space access");
 125 }
 126
 127 pcitag_t
 128 prep_pci_direct_make_tag(void *v, int bus, int device, int function)
 129 {
 130         pcitag_t tag;
 131
 132         if (bus >= 256 || device >= 32 || function >= 8)
 133                 panic("prep_pci_direct_make_tag: bad request");
 134
 135         tag = (bus << 16) | (device << 11) | (function << 8);
 136
 137         return tag;
 138 }
 139
 140 void
 141 prep_pci_direct_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
 142     int *fp)
 143 {
 144
 145         if (bp != NULL)
 146                 *bp = (tag >> 16) & 0xff;
 147         if (dp != NULL)
 148                 *dp = (tag >> 11) & 0x1f;
 149         if (fp != NULL)
 150                 *fp = (tag >> 8) & 0x7;
 151         return;
 152 }
 153
 154 pcireg_t
 155 prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg)
 156 {
 157         pcireg_t data;
 158         int bus, device, function;
 159         int s;
 160
 161         prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
 162
 163         if (bus == 0) {
 164                 /* Check if device selector is within selector range. */
 165                 if (1 << device & ~PCI_DCONF_DEV) {
 166                         data = ~0;
 167                         goto out;
 168                 }
 169                 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
 170         }
 171
 172         s = splhigh();
 173         data = in32rb(PCI_DCONF_BASE | tag | reg);
 174         splx(s);
 175
 176 out:
 177         return data;
 178 }
 179
 180 void
 181 prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
 182 {
 183         int bus, device, function;
 184         int s;
 185
 186         DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ",
 187             (unsigned long)v, tag, reg, (unsigned long)data));
 188
 189         prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
 190
 191         if (bus == 0) {
 192                 /* Check if device selector is within selector range. */
 193                 if (1 << device & ~PCI_DCONF_DEV) {
 194                         /* Should never happen. */
 195                         panic("prep_pci_direct_conf_write: bad device %d",
 196                             device);
 197                 }
 198                 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
 199         }
 200
 201         s = splhigh();
 202         out32rb(PCI_DCONF_BASE | tag | reg, data);
 203         splx(s);
 204 }