1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * PCI configuration space access routines 31 */ 32 33 #include <sys/systm.h> 34 #include <sys/psw.h> 35 #include <sys/bootconf.h> 36 #include <sys/reboot.h> 37 #include <sys/pci_impl.h> 38 #include <sys/pci_cfgspace.h> 39 #include <sys/pci_cfgspace_impl.h> 40 41 int pci_bios_cfg_type = PCI_MECHANISM_UNKNOWN; 42 int pci_bios_nbus; 43 int pci_bios_mech; 44 int pci_bios_vers; 45 46 /* 47 * These two variables can be used to force a configuration mechanism or 48 * to force which function is used to probe for the presence of the PCI bus. 49 */ 50 int PCI_CFG_TYPE = 0; 51 int PCI_PROBE_TYPE = 0; 52 53 /* 54 * These function pointers lead to the actual implementation routines 55 * for configuration space access. Normally they lead to either the 56 * pci_mech1_* or pci_mech2_* routines, but they can also lead to 57 * routines that work around chipset bugs. 58 */ 59 uint8_t (*pci_getb_func)(int bus, int dev, int func, int reg); 60 uint16_t (*pci_getw_func)(int bus, int dev, int func, int reg); 61 uint32_t (*pci_getl_func)(int bus, int dev, int func, int reg); 62 void (*pci_putb_func)(int bus, int dev, int func, int reg, uint8_t val); 63 void (*pci_putw_func)(int bus, int dev, int func, int reg, uint16_t val); 64 void (*pci_putl_func)(int bus, int dev, int func, int reg, uint32_t val); 65 66 /* 67 * Internal routines 68 */ 69 static int pci_check(void); 70 static int pci_check_bios(void); 71 static int pci_get_cfg_type(void); 72 73 /* all config-space access routines share this one... */ 74 kmutex_t pcicfg_mutex; 75 76 /* ..except Orion and Neptune, which have to have their own */ 77 kmutex_t pcicfg_chipset_mutex; 78 79 void 80 pci_cfgspace_init(void) 81 { 82 mutex_init(&pcicfg_mutex, NULL, MUTEX_SPIN, 83 (ddi_iblock_cookie_t)ipltospl(15)); 84 mutex_init(&pcicfg_chipset_mutex, NULL, MUTEX_SPIN, 85 (ddi_iblock_cookie_t)ipltospl(15)); 86 if (!pci_check()) { 87 mutex_destroy(&pcicfg_mutex); 88 mutex_destroy(&pcicfg_chipset_mutex); 89 } 90 } 91 92 /* 93 * This code determines if this system supports PCI and which 94 * type of configuration access method is used 95 */ 96 97 static int 98 pci_check(void) 99 { 100 /* 101 * Only do this once. NB: If this is not a PCI system, and we 102 * get called twice, we can't detect it and will probably die 103 * horribly when we try to ask the BIOS whether PCI is present. 104 * This code is safe *ONLY* during system startup when the 105 * BIOS is still available. 106 */ 107 if (pci_bios_cfg_type != PCI_MECHANISM_UNKNOWN) 108 return (TRUE); 109 110 pci_bios_cfg_type = pci_check_bios(); 111 112 if (pci_bios_cfg_type == PCI_MECHANISM_NONE) 113 pci_bios_cfg_type = PCI_MECHANISM_1; /* default to mech 1 */ 114 115 switch (pci_get_cfg_type()) { 116 case PCI_MECHANISM_1: 117 if (pci_is_broken_orion()) { 118 pci_getb_func = pci_orion_getb; 119 pci_getw_func = pci_orion_getw; 120 pci_getl_func = pci_orion_getl; 121 pci_putb_func = pci_orion_putb; 122 pci_putw_func = pci_orion_putw; 123 pci_putl_func = pci_orion_putl; 124 } else { 125 pci_getb_func = pci_mech1_getb; 126 pci_getw_func = pci_mech1_getw; 127 pci_getl_func = pci_mech1_getl; 128 pci_putb_func = pci_mech1_putb; 129 pci_putw_func = pci_mech1_putw; 130 pci_putl_func = pci_mech1_putl; 131 } 132 break; 133 134 case PCI_MECHANISM_2: 135 if (pci_check_neptune()) { 136 /* 137 * The BIOS for some systems with the Intel 138 * Neptune chipset seem to default to #2 even 139 * though the chipset can do #1. Override 140 * the BIOS so that MP systems will work 141 * correctly. 142 */ 143 144 pci_getb_func = pci_neptune_getb; 145 pci_getw_func = pci_neptune_getw; 146 pci_getl_func = pci_neptune_getl; 147 pci_putb_func = pci_neptune_putb; 148 pci_putw_func = pci_neptune_putw; 149 pci_putl_func = pci_neptune_putl; 150 } else { 151 pci_getb_func = pci_mech2_getb; 152 pci_getw_func = pci_mech2_getw; 153 pci_getl_func = pci_mech2_getl; 154 pci_putb_func = pci_mech2_putb; 155 pci_putw_func = pci_mech2_putw; 156 pci_putl_func = pci_mech2_putl; 157 } 158 break; 159 160 default: 161 return (FALSE); 162 } 163 164 return (TRUE); 165 } 166 167 168 static int 169 pci_check_bios(void) 170 { 171 struct bop_regs regs; 172 uint32_t carryflag; 173 uint16_t ax, dx; 174 175 bzero(®s, sizeof (regs)); 176 regs.eax.word.ax = (PCI_FUNCTION_ID << 8) | PCI_BIOS_PRESENT; 177 178 BOP_DOINT(bootops, 0x1a, ®s); 179 carryflag = regs.eflags & PS_C; 180 ax = regs.eax.word.ax; 181 dx = regs.edx.word.dx; 182 183 /* the carry flag must not be set */ 184 if (carryflag != 0) 185 return (PCI_MECHANISM_NONE); 186 187 if (dx != ('P' | 'C'<<8)) 188 return (PCI_MECHANISM_NONE); 189 190 /* ah (the high byte of ax) must be zero */ 191 if ((ax & 0xff00) != 0) 192 return (PCI_MECHANISM_NONE); 193 194 pci_bios_mech = (ax & 0x3); 195 pci_bios_vers = regs.ebx.word.bx; 196 pci_bios_nbus = (regs.ecx.word.cx & 0xff); 197 198 switch (pci_bios_mech) { 199 default: /* ?!? */ 200 case 0: /* supports neither? */ 201 return (PCI_MECHANISM_NONE); 202 203 case 1: 204 case 3: /* supports both */ 205 return (PCI_MECHANISM_1); 206 207 case 2: 208 return (PCI_MECHANISM_2); 209 } 210 } 211 212 static int 213 pci_get_cfg_type(void) 214 { 215 /* Check to see if the config mechanism has been set in /etc/system */ 216 switch (PCI_CFG_TYPE) { 217 default: 218 case 0: 219 break; 220 case 1: 221 return (PCI_MECHANISM_1); 222 case 2: 223 return (PCI_MECHANISM_2); 224 case -1: 225 return (PCI_MECHANISM_NONE); 226 } 227 228 /* call one of the PCI detection algorithms */ 229 switch (PCI_PROBE_TYPE) { 230 default: 231 case 0: 232 /* From pci_check() and pci_check_bios() */ 233 return (pci_bios_cfg_type); 234 case -1: 235 return (PCI_MECHANISM_NONE); 236 } 237 } 238