1 /* $NetBSD: prep_pciconf_direct.c,v 1.4 2005/12/11 12:18:47 christos 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/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: prep_pciconf_direct.c,v 1.4 2005/12/11 12:18:47 christos Exp $"); 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/systm.h> 48 #include <sys/errno.h> 49 #include <sys/device.h> 50 51 #include <uvm/uvm_extern.h> 52 53 #define _POWERPC_BUS_DMA_PRIVATE 54 #include <machine/bus.h> 55 #include <machine/intr.h> 56 #include <machine/platform.h> 57 58 #include <powerpc/pio.h> 59 60 #include <dev/isa/isavar.h> 61 #include <dev/pci/pcivar.h> 62 #include <dev/pci/pcireg.h> 63 #include <dev/pci/pcidevs.h> 64 65 #ifdef DEBUG 66 #define DPRINTF(x) printf x 67 #else 68 #define DPRINTF(x) 69 #endif 70 71 /* Physical base address and size of PCI configuration space. */ 72 #define PCI_DCONF_BASE 0x80800000 73 #define PCI_DCONF_SIZE 0x00800000 74 /* Device function selection. */ 75 #define PCI_DCONF_FUNC 0x00000700 76 #define PCI_DCONF_FUNC_SHIFT 8 77 /* Configuration space register selection. */ 78 #define PCI_DCONF_REG 0x000000ff 79 #define PCI_DCONF_REG_SHIFT 0 80 /* Device selection; those bits still available. */ 81 #define PCI_DCONF_DEV \ 82 (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG)) 83 84 void prep_pci_direct_attach_hook(struct device *, struct device *, 85 struct pcibus_attach_args *); 86 pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 87 pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 88 void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t); 89 void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *); 90 91 void 92 prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc) 93 { 94 95 pc->pc_conf_v = NULL; 96 97 pc->pc_attach_hook = prep_pci_direct_attach_hook; 98 pc->pc_bus_maxdevs = prep_pci_bus_maxdevs; 99 pc->pc_make_tag = prep_pci_direct_make_tag; 100 pc->pc_conf_read = prep_pci_direct_conf_read; 101 pc->pc_conf_write = prep_pci_direct_conf_write; 102 103 pc->pc_intr_v = NULL; 104 105 pc->pc_intr_map = prep_pci_intr_map; 106 pc->pc_intr_string = prep_pci_intr_string; 107 pc->pc_intr_evcnt = prep_pci_intr_evcnt; 108 pc->pc_intr_establish = prep_pci_intr_establish; 109 pc->pc_intr_disestablish = prep_pci_intr_disestablish; 110 111 pc->pc_conf_interrupt = prep_pci_conf_interrupt; 112 pc->pc_decompose_tag = prep_pci_direct_decompose_tag; 113 pc->pc_conf_hook = prep_pci_conf_hook; 114 } 115 116 void 117 prep_pci_direct_attach_hook(struct device *parent, struct device *self, 118 struct pcibus_attach_args *pba) 119 { 120 121 if (pba->pba_bus == 0) 122 printf(": direct-mapped configuration space access"); 123 } 124 125 pcitag_t 126 prep_pci_direct_make_tag(void *v, int bus, int device, int function) 127 { 128 pcitag_t tag; 129 130 if (bus >= 256 || device >= 32 || function >= 8) 131 panic("prep_pci_direct_make_tag: bad request"); 132 133 tag = (bus << 16) | (device << 11) | (function << 8); 134 135 return tag; 136 } 137 138 void 139 prep_pci_direct_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, 140 int *fp) 141 { 142 143 if (bp != NULL) 144 *bp = (tag >> 16) & 0xff; 145 if (dp != NULL) 146 *dp = (tag >> 11) & 0x1f; 147 if (fp != NULL) 148 *fp = (tag >> 8) & 0x7; 149 return; 150 } 151 152 pcireg_t 153 prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg) 154 { 155 pcireg_t data; 156 int bus, device, function; 157 int s; 158 159 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function); 160 161 if (bus == 0) { 162 /* Check if device selector is within selector range. */ 163 if (1 << device & ~PCI_DCONF_DEV) { 164 data = ~0; 165 goto out; 166 } 167 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT); 168 } 169 170 s = splhigh(); 171 data = in32rb(PCI_DCONF_BASE | tag | reg); 172 splx(s); 173 174 out: 175 return data; 176 } 177 178 void 179 prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data) 180 { 181 int bus, device, function; 182 int s; 183 184 DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ", 185 (unsigned long)v, tag, reg, (unsigned long)data)); 186 187 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function); 188 189 if (bus == 0) { 190 /* Check if device selector is within selector range. */ 191 if (1 << device & ~PCI_DCONF_DEV) { 192 /* Should never happen. */ 193 panic("prep_pci_direct_conf_write: bad device %d", 194 device); 195 } 196 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT); 197 } 198 199 s = splhigh(); 200 out32rb(PCI_DCONF_BASE | tag | reg, data); 201 splx(s); 202 } 203