1 /* $NetBSD: prep_pciconf_direct.c,v 1.8 2011/07/01 16:56:52 dyoung 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 1.8 2011/07/01 16:56:52 dyoung 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 <sys/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 #include <prop/proplib.h> 66 67 #ifdef DEBUG 68 #define DPRINTF(x) aprint_debug x 69 #else 70 #define DPRINTF(x) 71 #endif 72 73 /* Physical base address and size of PCI configuration space. */ 74 #define PCI_DCONF_BASE 0x80800000 75 #define PCI_DCONF_SIZE 0x00800000 76 /* Device function selection. */ 77 #define PCI_DCONF_FUNC 0x00000700 78 #define PCI_DCONF_FUNC_SHIFT 8 79 /* Configuration space register selection. */ 80 #define PCI_DCONF_REG 0x000000ff 81 #define PCI_DCONF_REG_SHIFT 0 82 /* Device selection; those bits still available. */ 83 #define PCI_DCONF_DEV \ 84 (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG)) 85 86 void prep_pci_direct_attach_hook(device_t, device_t, 87 struct pcibus_attach_args *); 88 pcitag_t prep_pci_direct_make_tag(void *, int, int, int); 89 pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int); 90 void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t); 91 void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *); 92 93 void 94 prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc) 95 { 96 97 pc->pc_conf_v = NULL; 98 99 pc->pc_attach_hook = prep_pci_direct_attach_hook; 100 pc->pc_bus_maxdevs = prep_pci_bus_maxdevs; 101 pc->pc_make_tag = prep_pci_direct_make_tag; 102 pc->pc_conf_read = prep_pci_direct_conf_read; 103 pc->pc_conf_write = prep_pci_direct_conf_write; 104 105 pc->pc_intr_v = NULL; 106 107 pc->pc_intr_map = prep_pci_intr_map; 108 pc->pc_intr_string = genppc_pci_intr_string; 109 pc->pc_intr_evcnt = genppc_pci_intr_evcnt; 110 pc->pc_intr_establish = genppc_pci_intr_establish; 111 pc->pc_intr_disestablish = genppc_pci_intr_disestablish; 112 113 pc->pc_conf_interrupt = genppc_pci_conf_interrupt; 114 pc->pc_decompose_tag = prep_pci_direct_decompose_tag; 115 pc->pc_conf_hook = prep_pci_conf_hook; 116 } 117 118 void 119 prep_pci_direct_attach_hook(device_t parent, device_t self, 120 struct pcibus_attach_args *pba) 121 { 122 123 if (pba->pba_bus == 0) 124 aprint_normal(": direct-mapped configuration space access"); 125 } 126 127 pcitag_t 128 prep_pci_direct_make_tag(void *v, int bus, int device, int function) 129 { 130 pcitag_t tag; 131 132 if (bus >= 256 || device >= 32 || function >= 8) 133 panic("prep_pci_direct_make_tag: bad request"); 134 135 tag = (bus << 16) | (device << 11) | (function << 8); 136 137 return tag; 138 } 139 140 void 141 prep_pci_direct_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, 142 int *fp) 143 { 144 145 if (bp != NULL) 146 *bp = (tag >> 16) & 0xff; 147 if (dp != NULL) 148 *dp = (tag >> 11) & 0x1f; 149 if (fp != NULL) 150 *fp = (tag >> 8) & 0x7; 151 return; 152 } 153 154 pcireg_t 155 prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg) 156 { 157 pcireg_t data; 158 int bus, device, function; 159 int s; 160 161 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function); 162 163 if (bus == 0) { 164 /* Check if device selector is within selector range. */ 165 if (1 << device & ~PCI_DCONF_DEV) { 166 data = ~0; 167 goto out; 168 } 169 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT); 170 } 171 172 s = splhigh(); 173 data = in32rb(PCI_DCONF_BASE | tag | reg); 174 splx(s); 175 176 out: 177 return data; 178 } 179 180 void 181 prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data) 182 { 183 int bus, device, function; 184 int s; 185 186 DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ", 187 (unsigned long)v, tag, reg, (unsigned long)data)); 188 189 prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function); 190 191 if (bus == 0) { 192 /* Check if device selector is within selector range. */ 193 if (1 << device & ~PCI_DCONF_DEV) { 194 /* Should never happen. */ 195 panic("prep_pci_direct_conf_write: bad device %d", 196 device); 197 } 198 tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT); 199 } 200 201 s = splhigh(); 202 out32rb(PCI_DCONF_BASE | tag | reg, data); 203 splx(s); 204 } 205