1 /* $NetBSD: mcpcia_pci.c,v 1.14 2021/06/25 03:46:54 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1998 by Matthew Jacob 5 * NASA AMES Research Center. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice immediately at the beginning of the file, without modification, 13 * this list of conditions, and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 24 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 34 35 __KERNEL_RCSID(0, "$NetBSD: mcpcia_pci.c,v 1.14 2021/06/25 03:46:54 thorpej Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/device.h> 41 42 #include <dev/pci/pcireg.h> 43 #include <dev/pci/pcivar.h> 44 #include <alpha/pci/mcpciareg.h> 45 #include <alpha/pci/mcpciavar.h> 46 47 #define KV(_addr) ((void *)ALPHA_PHYS_TO_K0SEG((_addr))) 48 49 static int mcpcia_bus_maxdevs(void *, int); 50 static pcitag_t mcpcia_make_tag(void *, int, int, int); 51 static void mcpcia_decompose_tag(void *, pcitag_t, int *, int *, int *); 52 static pcireg_t mcpcia_conf_read(void *, pcitag_t, int); 53 static void mcpcia_conf_write(void *, pcitag_t, int, pcireg_t); 54 55 void 56 mcpcia_pci_init(pci_chipset_tag_t pc, void *v) 57 { 58 pc->pc_conf_v = v; 59 pc->pc_bus_maxdevs = mcpcia_bus_maxdevs; 60 pc->pc_make_tag = mcpcia_make_tag; 61 pc->pc_decompose_tag = mcpcia_decompose_tag; 62 pc->pc_conf_read = mcpcia_conf_read; 63 pc->pc_conf_write = mcpcia_conf_write; 64 } 65 66 static int 67 mcpcia_bus_maxdevs(void *cpv, int busno) 68 { 69 return (MCPCIA_MAXDEV); 70 } 71 72 static pcitag_t 73 mcpcia_make_tag(void *cpv, int b, int d, int f) 74 { 75 pcitag_t tag; 76 tag = (b << 21) | (d << 16) | (f << 13); 77 return (tag); 78 } 79 80 static void 81 mcpcia_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp) 82 { 83 if (bp != NULL) 84 *bp = (tag >> 21) & 0xff; 85 if (dp != NULL) 86 *dp = (tag >> 16) & 0x1f; 87 if (fp != NULL) 88 *fp = (tag >> 13) & 0x7; 89 } 90 91 static pcireg_t 92 mcpcia_conf_read(void *cpv, pcitag_t tag, int offset) 93 { 94 struct mcpcia_config *ccp = cpv; 95 pcireg_t *dp, data = (pcireg_t) -1; 96 unsigned long paddr; 97 98 if ((unsigned int)offset >= PCI_CONF_SIZE) 99 return (data); 100 101 /* 102 * There's nothing in slot 0 on a primary bus- don't even try. 103 */ 104 if ((tag >> 21) == 0 && ((uint32_t) tag & 0x1f0000) == 0) 105 return (data); 106 107 if (ccp == NULL) { 108 panic("NULL ccp in mcpcia_conf_read"); 109 } 110 paddr = (unsigned long) tag; 111 paddr |= (3LL << 3); /* 32 Bit PCI byte enables */ 112 paddr |= ((unsigned long) ((offset >> 2) << 7)); 113 paddr |= MCPCIA_PCI_CONF; 114 paddr |= ccp->cc_sysbase; 115 dp = (pcireg_t *)KV(paddr); 116 if (badaddr(dp, sizeof (*dp)) == 0) { 117 data = *dp; 118 } 119 return (data); 120 } 121 122 static void 123 mcpcia_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data) 124 { 125 struct mcpcia_config *ccp = cpv; 126 pcireg_t *dp; 127 unsigned long paddr; 128 129 if ((unsigned int)offset >= PCI_CONF_SIZE) 130 return; 131 132 /* 133 * There's nothing in slot 0 on a primary bus- don't even try. 134 */ 135 if ((tag >> 21) == 0 && ((uint32_t) tag & 0x1f0000) == 0) 136 return; 137 138 if (ccp == NULL) { 139 panic("NULL ccp in mcpcia_conf_write"); 140 } 141 paddr = (unsigned long) tag; 142 paddr |= (3LL << 3); /* 32 Bit PCI byte enables */ 143 paddr |= ((unsigned long) ((offset >> 2) << 7)); 144 paddr |= MCPCIA_PCI_CONF; 145 paddr |= ccp->cc_sysbase; 146 147 dp = (pcireg_t *)KV(paddr); 148 *dp = data; 149 } 150