/* $NetBSD: irongate_pci.c,v 1.12.10.1 2024/04/16 19:10:07 martin Exp $ */ /*- * Copyright (c) 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * PCI Configuration Space support for the AMD 751 (``Irongate'') core logic * chipset. */ #include /* RCS ID & Copyright macro defns */ __KERNEL_RCSID(0, "$NetBSD: irongate_pci.c,v 1.12.10.1 2024/04/16 19:10:07 martin Exp $"); #include #include #include #include #include #include #include #include static pcireg_t irongate_conf_read(void *, pcitag_t, int); static void irongate_conf_write(void *, pcitag_t, int, pcireg_t); /* AMD 751 systems are always single-processor, so this is easy. */ #define PCI_CONF_LOCK(s) (s) = splhigh() #define PCI_CONF_UNLOCK(s) splx((s)) #define PCI_CONF_ADDR (IRONGATE_IO_BASE|IRONGATE_CONFADDR) #define PCI_CONF_DATA (IRONGATE_IO_BASE|IRONGATE_CONFDATA) #define REGVAL(r) (*(volatile uint32_t *)ALPHA_PHYS_TO_K0SEG(r)) void irongate_pci_init(pci_chipset_tag_t pc, void *v) { pc->pc_conf_v = v; pc->pc_conf_read = irongate_conf_read; pc->pc_conf_write = irongate_conf_write; } static pcireg_t irongate_conf_read(void *ipv, pcitag_t tag, int offset) { int b, d; if ((unsigned int)offset >= PCI_CONF_SIZE) return (pcireg_t) -1; struct irongate_config * const icp = ipv; /* * The AMD 751 appears in PCI configuration space, but * that is ... counter-intuitive to the way we normally * attach PCI-Host bridges on the Alpha. So, filter out * the AMD 751 device here. We provide a private entry * point for getting at it from machdep code. */ pci_decompose_tag(&icp->ic_pc, tag, &b, &d, NULL); if (b == 0 && d == IRONGATE_PCIHOST_DEV && offset == PCI_ID_REG) return ((pcireg_t) -1); return (irongate_conf_read0(ipv, tag, offset)); } pcireg_t irongate_conf_read0(void *ipv, pcitag_t tag, int offset) { pcireg_t data; int s; if ((unsigned int)offset >= PCI_CONF_SIZE) return (pcireg_t) -1; PCI_CONF_LOCK(s); REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff)); alpha_mb(); data = REGVAL(PCI_CONF_DATA); alpha_mb(); REGVAL(PCI_CONF_ADDR) = 0; alpha_mb(); PCI_CONF_UNLOCK(s); return (data); } static void irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data) { int s; if ((unsigned int)offset >= PCI_CONF_SIZE) return; PCI_CONF_LOCK(s); REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff)); alpha_mb(); REGVAL(PCI_CONF_DATA) = data; alpha_mb(); REGVAL(PCI_CONF_ADDR) = 0; alpha_mb(); PCI_CONF_UNLOCK(s); }