sys/arch/powerpc/pci/pciconf_indirect.c

   1 /* $NetBSD: pciconf_indirect.c,v 1.2 2007/10/17 19:56:44 garbled Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Tim Rightnour
   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  * Generic PowerPC functions for talking to an indirect configuration style
  34  * PCI Bridge.
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __KERNEL_RCSID(0, "$NetBSD: pciconf_indirect.c,v 1.2 2007/10/17 19:56:44 garbled Exp $");
  39
  40 #include <sys/types.h>
  41 #include <sys/param.h>
  42 #include <sys/time.h>
  43 #include <sys/systm.h>
  44 #include <sys/errno.h>
  45 #include <sys/device.h>
  46
  47 #include <uvm/uvm_extern.h>
  48
  49 #define _POWERPC_BUS_DMA_PRIVATE
  50 #include <machine/bus.h>
  51 #include <machine/intr.h>
  52 #include <machine/pio.h>
  53
  54 #if NISA > 0
  55 #include <dev/isa/isavar.h>
  56 #endif
  57
  58 #include <dev/pci/pcivar.h>
  59 #include <dev/pci/pcireg.h>
  60 #include <dev/pci/pcidevs.h>
  61
  62 #define PCI_MODE1_ENABLE        0x80000000UL
  63
  64 void
  65 genppc_pci_indirect_attach_hook(struct device *parent, struct device *self,
  66     struct pcibus_attach_args *pba)
  67 {
  68
  69         if (pba->pba_bus != 0)
  70                 return;
  71
  72         printf(": indirect configuration space access");
  73 }
  74
  75 pcitag_t
  76 genppc_pci_indirect_make_tag(void *v, int bus, int device, int function)
  77 {
  78         pcitag_t tag;
  79
  80         if (bus >= 256 || device >= 32 || function >= 8)
  81                 panic("pci_make_tag: bad request");
  82
  83         tag = PCI_MODE1_ENABLE |
  84                     (bus << 16) | (device << 11) | (function << 8);
  85         return tag;
  86 }
  87
  88 void
  89 genppc_pci_indirect_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
  90     int *fp)
  91 {
  92
  93         if (bp != NULL)
  94                 *bp = (tag >> 16) & 0xff;
  95         if (dp != NULL)
  96                 *dp = (tag >> 11) & 0x1f;
  97         if (fp != NULL)
  98                 *fp = (tag >> 8) & 0x7;
  99         return;
 100 }
 101
 102 pcireg_t
 103 genppc_pci_indirect_conf_read(void *v, pcitag_t tag, int reg)
 104 {
 105         pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
 106         pcireg_t data;
 107         int s;
 108
 109         s = splhigh();
 110         out32rb(pc->pc_addr, tag | reg);
 111         data = in32rb(pc->pc_data);
 112         out32rb(pc->pc_addr, 0);
 113         splx(s);
 114
 115         return data;
 116 }
 117
 118 void
 119 genppc_pci_indirect_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
 120 {
 121         pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
 122         int s;
 123
 124         s = splhigh();
 125         out32rb(pc->pc_addr, tag | reg);
 126         out32rb(pc->pc_data, data);
 127         out32rb(pc->pc_addr, 0);
 128         splx(s);
 129 }