1 /* $NetBSD: irongate_pci.c,v 1.11 2021/05/07 16:58:34 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 1.11 2021/05/07 16:58:34 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 void irongate_attach_hook(device_t, device_t, 52 struct pcibus_attach_args *); 53 static int irongate_bus_maxdevs(void *, int); 54 static pcitag_t irongate_make_tag(void *, int, int, int); 55 static void irongate_decompose_tag(void *, pcitag_t, int *, int *, 56 int *); 57 static pcireg_t irongate_conf_read(void *, pcitag_t, int); 58 static 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 static void 83 irongate_attach_hook(device_t parent, device_t self, 84 struct pcibus_attach_args *pba) 85 { 86 } 87 88 static int 89 irongate_bus_maxdevs(void *ipv, int busno) 90 { 91 92 return 32; 93 } 94 95 static 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 static 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 static 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 static 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