176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman/* 276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. 376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * This program is free software; you can redistribute it and/or 576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * modify it under the terms of the GNU General Public License as 676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * published by the Free Software Foundation; either version 2 of the 776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * License, or any later version. 876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * This program is distributed in the hope that it will be useful, but 1076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * WITHOUT ANY WARRANTY; without even the implied warranty of 1176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * General Public License for more details. 1376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 1476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * You should have received a copy of the GNU General Public License 1576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * along with this program; if not, write to the Free Software 1676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 1776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman */ 1876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 1976d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanFILE_LICENCE ( GPL2_OR_LATER ); 2076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 2176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman#include <stdint.h> 2276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman#include <gpxe/pci.h> 2376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman#include <realmode.h> 2476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 2576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman/** @file 2676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 2776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * PCI configuration space access via PCI BIOS 2876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 2976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman */ 3076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 3176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman/** 3276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * Determine maximum PCI bus number within system 3376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 3476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @ret max_bus Maximum bus number 3576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman */ 3676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartmanstatic int pcibios_max_bus ( void ) { 3776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman int discard_a, discard_D; 3876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman uint8_t max_bus; 3976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 4076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman __asm__ __volatile__ ( REAL_CODE ( "stc\n\t" 4176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "int $0x1a\n\t" 4276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "jnc 1f\n\t" 4376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "xorw %%cx, %%cx\n\t" 4476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "\n1:\n\t" ) 4576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "=c" ( max_bus ), "=a" ( discard_a ), 4676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "=D" ( discard_D ) 4776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "a" ( PCIBIOS_INSTALLATION_CHECK >> 16 ), 4876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "D" ( 0 ) 4976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "ebx", "edx" ); 5076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 5176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman return max_bus; 5276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman} 5376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 5476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman/** 5576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * Read configuration space via PCI BIOS 5676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 5776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @v pci PCI device 5876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @v command PCI BIOS command 5976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @v value Value read 6076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @ret rc Return status code 6176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman */ 6276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartmanint pcibios_read ( struct pci_device *pci, uint32_t command, uint32_t *value ){ 6376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman int discard_b, discard_D; 6476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman int status; 6576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 6676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman __asm__ __volatile__ ( REAL_CODE ( "stc\n\t" 6776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "int $0x1a\n\t" 6876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "jnc 1f\n\t" 6976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "xorl %%eax, %%eax\n\t" 7076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "decl %%eax\n\t" 7176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "movl %%eax, %%ecx\n\t" 7276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "\n1:\n\t" ) 7376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "=a" ( status ), "=b" ( discard_b ), 7476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "=c" ( *value ), "=D" ( discard_D ) 7576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "a" ( command >> 16 ), "D" ( command ), 7676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "b" ( PCI_BUSDEVFN ( pci->bus, pci->devfn ) ) 7776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "edx" ); 7876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 7976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman return ( ( status >> 8 ) & 0xff ); 8076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman} 8176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 8276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman/** 8376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * Write configuration space via PCI BIOS 8476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * 8576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @v pci PCI device 8676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @v command PCI BIOS command 8776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @v value Value to be written 8876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman * @ret rc Return status code 8976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman */ 9076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartmanint pcibios_write ( struct pci_device *pci, uint32_t command, uint32_t value ){ 9176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman int discard_b, discard_c, discard_D; 9276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman int status; 9376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 9476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman __asm__ __volatile__ ( REAL_CODE ( "stc\n\t" 9576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "int $0x1a\n\t" 9676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "jnc 1f\n\t" 9776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "movb $0xff, %%ah\n\t" 9876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "\n1:\n\t" ) 9976d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "=a" ( status ), "=b" ( discard_b ), 10076d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "=c" ( discard_c ), "=D" ( discard_D ) 10176d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "a" ( command >> 16 ), "D" ( command ), 10276d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "b" ( PCI_BUSDEVFN ( pci->bus, pci->devfn ) ), 10376d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman "c" ( value ) 10476d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman : "edx" ); 10576d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 10676d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman return ( ( status >> 8 ) & 0xff ); 10776d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman} 10876d05dc695b06c4e987bb8078f78032441e1430cGreg Hartman 10976d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI ( pcbios, pci_max_bus, pcibios_max_bus ); 11076d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_byte ); 11176d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_word ); 11276d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI_INLINE ( pcbios, pci_read_config_dword ); 11376d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI_INLINE ( pcbios, pci_write_config_byte ); 11476d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI_INLINE ( pcbios, pci_write_config_word ); 11576d05dc695b06c4e987bb8078f78032441e1430cGreg HartmanPROVIDE_PCIAPI_INLINE ( pcbios, pci_write_config_dword ); 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