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irongate_pci.c revision 1.6 
      1 /* $NetBSD: irongate_pci.c,v 1.6 2009/03/14 14:45:53 dsl Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 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 /*
     33  * PCI Configuration Space support for the AMD 751 (``Irongate'') core logic
     34  * chipset.
     35  */
     36 
     37 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     38 
     39 __KERNEL_RCSID(0, "$NetBSD: irongate_pci.c,v 1.6 2009/03/14 14:45:53 dsl Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/kernel.h>
     44 #include <sys/device.h>
     45 
     46 #include <uvm/uvm_extern.h>
     47 
     48 #include <dev/pci/pcireg.h>
     49 #include <dev/pci/pcivar.h>
     50 #include <alpha/pci/irongatereg.h>
     51 #include <alpha/pci/irongatevar.h>
     52 
     53 void		irongate_attach_hook(struct device *, struct device *,
     54 		    struct pcibus_attach_args *);
     55 int		irongate_bus_maxdevs(void *, int);
     56 pcitag_t	irongate_make_tag(void *, int, int, int);
     57 void		irongate_decompose_tag(void *, pcitag_t, int *, int *,
     58 		    int *);
     59 pcireg_t	irongate_conf_read(void *, pcitag_t, int);
     60 void		irongate_conf_write(void *, pcitag_t, int, pcireg_t);
     61 
     62 /* AMD 751 systems are always single-processor, so this is easy. */
     63 #define	PCI_CONF_LOCK(s)	(s) = splhigh()
     64 #define	PCI_CONF_UNLOCK(s)	splx((s))
     65 
     66 #define	PCI_CONF_ADDR	(IRONGATE_IO_BASE|IRONGATE_CONFADDR)
     67 #define	PCI_CONF_DATA	(IRONGATE_IO_BASE|IRONGATE_CONFDATA)
     68 
     69 #define	REGVAL(r)	(*(volatile u_int32_t *)ALPHA_PHYS_TO_K0SEG(r))
     70 
     71 void
     72 irongate_pci_init(pci_chipset_tag_t pc, void *v)
     73 {
     74 
     75 	pc->pc_conf_v = v;
     76 	pc->pc_attach_hook = irongate_attach_hook;
     77 	pc->pc_bus_maxdevs = irongate_bus_maxdevs;
     78 	pc->pc_make_tag = irongate_make_tag;
     79 	pc->pc_decompose_tag = irongate_decompose_tag;
     80 	pc->pc_conf_read = irongate_conf_read;
     81 	pc->pc_conf_write = irongate_conf_write;
     82 }
     83 
     84 void
     85 irongate_attach_hook(struct device *parent, struct device *self,
     86     struct pcibus_attach_args *pba)
     87 {
     88 }
     89 
     90 int
     91 irongate_bus_maxdevs(void *ipv, int busno)
     92 {
     93 
     94 	return 32;
     95 }
     96 
     97 pcitag_t
     98 irongate_make_tag(void *ipv, int b, int d, int f)
     99 {
    100 
    101 	return (b << 16) | (d << 11) | (f << 8);
    102 }
    103 
    104 void
    105 irongate_decompose_tag(void *ipv, pcitag_t tag, int *bp, int *dp, int *fp)
    106 {
    107 
    108 	if (bp != NULL)
    109 		*bp = (tag >> 16) & 0xff;
    110 	if (dp != NULL)
    111 		*dp = (tag >> 11) & 0x1f;
    112 	if (fp != NULL)
    113 		*fp = (tag >> 8) & 0x7;
    114 }
    115 
    116 pcireg_t
    117 irongate_conf_read(void *ipv, pcitag_t tag, int offset)
    118 {
    119 	int d;
    120 
    121 	/*
    122 	 * The AMD 751 appears in PCI configuration space, but
    123 	 * that is ... counter-intuitive to the way we normally
    124 	 * attach PCI-Host bridges on the Alpha.  So, filter out
    125 	 * the AMD 751 device here.  We provide a private entry
    126 	 * point for getting at it from machdep code.
    127 	 */
    128 	irongate_decompose_tag(ipv, tag, NULL, &d, NULL);
    129 	if (d == IRONGATE_PCIHOST_DEV && offset == PCI_ID_REG)
    130 		return ((pcireg_t) -1);
    131 
    132 	return (irongate_conf_read0(ipv, tag, offset));
    133 }
    134 
    135 pcireg_t
    136 irongate_conf_read0(void *ipv, pcitag_t tag, int offset)
    137 {
    138 	pcireg_t data;
    139 	int s;
    140 
    141 	PCI_CONF_LOCK(s);
    142 	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
    143 	alpha_mb();
    144 	data = REGVAL(PCI_CONF_DATA);
    145 	REGVAL(PCI_CONF_ADDR) = 0;
    146 	alpha_mb();
    147 	PCI_CONF_UNLOCK(s);
    148 
    149 	return (data);
    150 }
    151 
    152 void
    153 irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data)
    154 {
    155 	int s;
    156 
    157 	PCI_CONF_LOCK(s);
    158 	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
    159 	alpha_mb();
    160 	REGVAL(PCI_CONF_DATA) = data;
    161 	alpha_mb();
    162 	REGVAL(PCI_CONF_ADDR) = 0;
    163 	alpha_mb();
    164 	PCI_CONF_UNLOCK(s);
    165 }
    166