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irongate_pci.c revision 1.10 
      1 /* $NetBSD: irongate_pci.c,v 1.10 2015/10/02 05:22:49 msaitoh 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 1.10 2015/10/02 05:22:49 msaitoh 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 <dev/pci/pcireg.h>
     47 #include <dev/pci/pcivar.h>
     48 #include <alpha/pci/irongatereg.h>
     49 #include <alpha/pci/irongatevar.h>
     50 
     51 void		irongate_attach_hook(device_t, device_t,
     52 		    struct pcibus_attach_args *);
     53 int		irongate_bus_maxdevs(void *, int);
     54 pcitag_t	irongate_make_tag(void *, int, int, int);
     55 void		irongate_decompose_tag(void *, pcitag_t, int *, int *,
     56 		    int *);
     57 pcireg_t	irongate_conf_read(void *, pcitag_t, int);
     58 void		irongate_conf_write(void *, pcitag_t, int, pcireg_t);
     59 
     60 /* AMD 751 systems are always single-processor, so this is easy. */
     61 #define	PCI_CONF_LOCK(s)	(s) = splhigh()
     62 #define	PCI_CONF_UNLOCK(s)	splx((s))
     63 
     64 #define	PCI_CONF_ADDR	(IRONGATE_IO_BASE|IRONGATE_CONFADDR)
     65 #define	PCI_CONF_DATA	(IRONGATE_IO_BASE|IRONGATE_CONFDATA)
     66 
     67 #define	REGVAL(r)	(*(volatile uint32_t *)ALPHA_PHYS_TO_K0SEG(r))
     68 
     69 void
     70 irongate_pci_init(pci_chipset_tag_t pc, void *v)
     71 {
     72 
     73 	pc->pc_conf_v = v;
     74 	pc->pc_attach_hook = irongate_attach_hook;
     75 	pc->pc_bus_maxdevs = irongate_bus_maxdevs;
     76 	pc->pc_make_tag = irongate_make_tag;
     77 	pc->pc_decompose_tag = irongate_decompose_tag;
     78 	pc->pc_conf_read = irongate_conf_read;
     79 	pc->pc_conf_write = irongate_conf_write;
     80 }
     81 
     82 void
     83 irongate_attach_hook(device_t parent, device_t self,
     84     struct pcibus_attach_args *pba)
     85 {
     86 }
     87 
     88 int
     89 irongate_bus_maxdevs(void *ipv, int busno)
     90 {
     91 
     92 	return 32;
     93 }
     94 
     95 pcitag_t
     96 irongate_make_tag(void *ipv, int b, int d, int f)
     97 {
     98 
     99 	return (b << 16) | (d << 11) | (f << 8);
    100 }
    101 
    102 void
    103 irongate_decompose_tag(void *ipv, pcitag_t tag, int *bp, int *dp, int *fp)
    104 {
    105 
    106 	if (bp != NULL)
    107 		*bp = (tag >> 16) & 0xff;
    108 	if (dp != NULL)
    109 		*dp = (tag >> 11) & 0x1f;
    110 	if (fp != NULL)
    111 		*fp = (tag >> 8) & 0x7;
    112 }
    113 
    114 pcireg_t
    115 irongate_conf_read(void *ipv, pcitag_t tag, int offset)
    116 {
    117 	int d;
    118 
    119 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    120 		return (pcireg_t) -1;
    121 
    122 	/*
    123 	 * The AMD 751 appears in PCI configuration space, but
    124 	 * that is ... counter-intuitive to the way we normally
    125 	 * attach PCI-Host bridges on the Alpha.  So, filter out
    126 	 * the AMD 751 device here.  We provide a private entry
    127 	 * point for getting at it from machdep code.
    128 	 */
    129 	irongate_decompose_tag(ipv, tag, NULL, &d, NULL);
    130 	if (d == IRONGATE_PCIHOST_DEV && offset == PCI_ID_REG)
    131 		return ((pcireg_t) -1);
    132 
    133 	return (irongate_conf_read0(ipv, tag, offset));
    134 }
    135 
    136 pcireg_t
    137 irongate_conf_read0(void *ipv, pcitag_t tag, int offset)
    138 {
    139 	pcireg_t data;
    140 	int s;
    141 
    142 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    143 		return (pcireg_t) -1;
    144 
    145 	PCI_CONF_LOCK(s);
    146 	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
    147 	alpha_mb();
    148 	data = REGVAL(PCI_CONF_DATA);
    149 	REGVAL(PCI_CONF_ADDR) = 0;
    150 	alpha_mb();
    151 	PCI_CONF_UNLOCK(s);
    152 
    153 	return (data);
    154 }
    155 
    156 void
    157 irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data)
    158 {
    159 	int s;
    160 
    161 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    162 		return;
    163 
    164 	PCI_CONF_LOCK(s);
    165 	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
    166 	alpha_mb();
    167 	REGVAL(PCI_CONF_DATA) = data;
    168 	alpha_mb();
    169 	REGVAL(PCI_CONF_ADDR) = 0;
    170 	alpha_mb();
    171 	PCI_CONF_UNLOCK(s);
    172 }
    173