1 /* $NetBSD: prep_pciconf_direct.c,v 1.2 2003/03/18 16:40:23 matt Exp $ */ 2 3 /* 4 * Copyright (c) 2002 Klaus J. Klein. All rights reserved. 5 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 6 * Copyright (c) 1994 Charles M. Hannum. 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, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Charles M. Hannum. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * Machine-specific functions for PCI autoconfiguration. 36 * 37 * This version is specific to the direct-mapped configuration space access 38 * such as implemented on the IBM 27-82650 PCI Bridge/Memory Controller. 39 */ 40 41 #include <sys/types.h> 42 #include <sys/param.h> 43 #include <sys/time.h> 44 #include <sys/systm.h> 45 #include <sys/errno.h> 46 #include <sys/device.h> 47 48 #include <uvm/uvm_extern.h> 49 50 #define _POWERPC_BUS_DMA_PRIVATE 51 #include <machine/bus.h> 52 #include <machine/intr.h> 53 #include <machine/platform.h> 54 55 #include <powerpc/pio.h> 56 57 #include <dev/isa/isavar.h> 58 #include <dev/pci/pcivar.h> 59 #include <dev/pci/pcireg.h> 60 #include <dev/pci/pcidevs.h> 61 62 #ifdef DEBUG 63 #define DPRINTF(x) printf x 64 #else 65 #define DPRINTF(x) 66 #endif 67 68 /* Physical base address and size of PCI configuration space. */ 69 #define PCI_DCONF_BASE 0x80800000 70 #define PCI_DCONF_SIZE 0x00800000 71 /* Device function selection. */ 72 #define PCI_DCONF_FUNC 0x00000700 73 #define PCI_DCONF_FUNC_SHIFT 8 74 /* Configuration space register selection. */ 75 #define PCI_DCONF_REG 0x000000ff 76 #define PCI_DCONF_REG_SHIFT 0 77 /* Device selection; those bits still available. */ 78 #define PCI_DCONF_DEV \ 79 (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG)) 80 81 void prep_pci_direct_attach_hook(struct device *, struct device *, 82 struct pcibus_attach_args *); 83 pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 84 pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 85 void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t); 86 void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *); 87 88 void 89 prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc) 90 { 91 92 pc->pc_conf_v = NULL; 93 94 pc->pc_attach_hook = prep_pci_direct_attach_hook; 95 pc->pc_bus_maxdevs = prep_pci_bus_maxdevs; 96 pc->pc_make_tag = prep_pci_direct_make_tag; 97 pc->pc_conf_read = prep_pci_direct_conf_read; 98 pc->pc_conf_write = prep_pci_direct_conf_write; 99 100 pc->pc_intr_v = NULL; 101 102 pc->pc_intr_map = prep_pci_intr_map; 103 pc->pc_intr_string = prep_pci_intr_string; 104 pc->pc_intr_evcnt = prep_pci_intr_evcnt; 105 pc->pc_intr_establish = prep_pci_intr_establish; 106 pc->pc_intr_disestablish = prep_pci_intr_disestablish; 107 108 pc->pc_conf_interrupt = prep_pci_conf_interrupt; 109 pc->pc_decompose_tag = prep_pci_direct_decompose_tag; 110 pc->pc_conf_hook = prep_pci_conf_hook; 111 } 112 113 void 114 prep_pci_direct_attach_hook(struct device *parent, struct device *self, 115 struct pcibus_attach_args *pba) 116 { 117 118 if (pba->pba_bus == 0) 119 printf(": direct-mapped configuration space access"); 120 } 121 122 pcitag_t 123 prep_pci_direct_make_tag(void *v, int bus, int device, int function) 124 { 125 pcitag_t tag; 126 127 if (bus >= 256 || device >= 32 || function >= 8) 128 panic("prep_pci_direct_make_tag: bad request"); 129 130 tag = (bus << 16) | (device << 11) | (function << 8); 131 132 return tag; 133 } 134 135 void 136 prep_pci_direct_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, 137 int *fp) 138 { 139 140 if (bp != NULL) 141 *bp = (tag >> 16) & 0xff; 142 if (dp != NULL) 143 *dp = (tag >> 11) & 0x1f; 144 if (fp != NULL) 145 *fp = (tag >> 8) & 0x7; 146 return; 147 } 148 149 pcireg_t 150 prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg) 151 { 152 pcireg_t data; 153 int bus, device, function; 154 int s; 155 156 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function); 157 158 if (bus == 0) { 159 /* Check if device selector is within selector range. */ 160 if (1 << device & ~PCI_DCONF_DEV) { 161 data = ~0; 162 goto out; 163 } 164 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT); 165 } 166 167 s = splhigh(); 168 data = in32rb(PCI_DCONF_BASE | tag | reg); 169 splx(s); 170 171 out: 172 return data; 173 } 174 175 void 176 prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data) 177 { 178 int bus, device, function; 179 int s; 180 181 DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ", 182 (unsigned long)v, tag, reg, (unsigned long)data)); 183 184 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function); 185 186 if (bus == 0) { 187 /* Check if device selector is within selector range. */ 188 if (1 << device & ~PCI_DCONF_DEV) { 189 /* Should never happen. */ 190 panic("prep_pci_direct_conf_write: bad device %d", 191 device); 192 } 193 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT); 194 } 195 196 s = splhigh(); 197 out32rb(PCI_DCONF_BASE | tag | reg, data); 198 splx(s); 199 } 200