Home | History | Annotate | Line # | Download | only in pci 
      1 /* $NetBSD: irongate_pci.c,v 1.13 2024/04/03 04:30:30 thorpej 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 1.13 2024/04/03 04:30:30 thorpej 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 static pcireg_t	irongate_conf_read(void *, pcitag_t, int);
     52 static void	irongate_conf_write(void *, pcitag_t, int, pcireg_t);
     53 
     54 /* AMD 751 systems are always single-processor, so this is easy. */
     55 #define	PCI_CONF_LOCK(s)	(s) = splhigh()
     56 #define	PCI_CONF_UNLOCK(s)	splx((s))
     57 
     58 #define	PCI_CONF_ADDR	(IRONGATE_IO_BASE|IRONGATE_CONFADDR)
     59 #define	PCI_CONF_DATA	(IRONGATE_IO_BASE|IRONGATE_CONFDATA)
     60 
     61 #define	REGVAL(r)	(*(volatile uint32_t *)ALPHA_PHYS_TO_K0SEG(r))
     62 
     63 void
     64 irongate_pci_init(pci_chipset_tag_t pc, void *v)
     65 {
     66 
     67 	pc->pc_conf_v = v;
     68 	pc->pc_conf_read = irongate_conf_read;
     69 	pc->pc_conf_write = irongate_conf_write;
     70 }
     71 
     72 static pcireg_t
     73 irongate_conf_read(void *ipv, pcitag_t tag, int offset)
     74 {
     75 	int b, d;
     76 
     77 	if ((unsigned int)offset >= PCI_CONF_SIZE)
     78 		return (pcireg_t) -1;
     79 
     80 	struct irongate_config * const icp = ipv;
     81 
     82 	/*
     83 	 * The AMD 751 appears in PCI configuration space, but
     84 	 * that is ... counter-intuitive to the way we normally
     85 	 * attach PCI-Host bridges on the Alpha.  So, filter out
     86 	 * the AMD 751 device here.  We provide a private entry
     87 	 * point for getting at it from machdep code.
     88 	 */
     89 	pci_decompose_tag(&icp->ic_pc, tag, &b, &d, NULL);
     90 	if (b == 0 && d == IRONGATE_PCIHOST_DEV && offset == PCI_ID_REG)
     91 		return ((pcireg_t) -1);
     92 
     93 	return (irongate_conf_read0(ipv, tag, offset));
     94 }
     95 
     96 pcireg_t
     97 irongate_conf_read0(void *ipv, pcitag_t tag, int offset)
     98 {
     99 	pcireg_t data;
    100 	int s;
    101 
    102 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    103 		return (pcireg_t) -1;
    104 
    105 	PCI_CONF_LOCK(s);
    106 	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
    107 	alpha_mb();
    108 	data = REGVAL(PCI_CONF_DATA);
    109 	alpha_mb();
    110 	REGVAL(PCI_CONF_ADDR) = 0;
    111 	alpha_mb();
    112 	PCI_CONF_UNLOCK(s);
    113 
    114 	return (data);
    115 }
    116 
    117 static void
    118 irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data)
    119 {
    120 	int s;
    121 
    122 	if ((unsigned int)offset >= PCI_CONF_SIZE)
    123 		return;
    124 
    125 	PCI_CONF_LOCK(s);
    126 	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
    127 	alpha_mb();
    128 	REGVAL(PCI_CONF_DATA) = data;
    129 	alpha_mb();
    130 	REGVAL(PCI_CONF_ADDR) = 0;
    131 	alpha_mb();
    132 	PCI_CONF_UNLOCK(s);
    133 }
    134