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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [i386/] [shared/] [pci/] [pcibios.c] - Rev 30
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/* * This software is Copyright (C) 1998 by T.sqware - all rights limited * It is provided in to the public domain "as is", can be freely modified * as far as this copyight notice is kept unchanged, but does not imply * an endorsement by T.sqware of the product in which it is included. * * $Id: pcibios.c,v 1.2 2001-09-27 11:59:49 chris Exp $ */ #include <rtems.h> #include <bsp.h> #include <assert.h> #include <pcibios.h> /* * This is simpliest possible PCI BIOS, it assumes that addressing * is flat and that stack is big enough */ static int pcibInitialized = 0; static unsigned int pcibEntry; /* * Array to pass data between c and asm parts, at the time of * writing I am not yet that familiar with extended asm feature * of gcc. This code is not on performance path, so we can care * relatively little about performance here */ static volatile unsigned int pcibExchg[5]; static int pcib_convert_err(int err); /* * Detects presense of PCI BIOS, returns * error code */ int pcib_init(void) { unsigned char *ucp; unsigned char sum; int i; pcibInitialized = 0; /* First, we have to look for BIOS-32 */ for(ucp=(unsigned char *)0xE0000; ucp < (unsigned char *)0xFFFFF; ucp+=0x10) { if(memcmp(ucp, "_32_", 4) != 0) { continue; } /* Got signature, check length */ if(*(ucp + 9) != 1) { continue; } /* Verify checksum */ sum = 0; for(i=0; i<16; i++) { sum += *(ucp+i); } if(sum == 0) { /* found */ break; } } if(ucp >= (unsigned char *)0xFFFFF) { /* BIOS-32 not found */ assert(0); return PCIB_ERR_NOTPRESENT; } /* BIOS-32 found, let us find PCI BIOS */ ucp += 4; pcibExchg[0] = *(unsigned int *)ucp; asm (" pusha"); /* Push all registers */ asm (" movl pcibExchg, %edi"); /* Move entry point to esi */ asm (" movl $0x49435024, %eax"); /* Move signature to eax */ asm (" xorl %ebx, %ebx"); /* Zero ebx */ asm (" pushl %cs"); asm (" call *%edi"); /* Call entry */ asm (" movl %eax, pcibExchg"); asm (" movl %ebx, pcibExchg+4"); asm (" movl %ecx, pcibExchg+8"); asm (" movl %edx, pcibExchg+12"); asm (" popa"); if((pcibExchg[0] & 0xff) != 0) { /* Not found */ assert(0); return PCIB_ERR_NOTPRESENT; } /* Found PCI entry point */ pcibEntry = pcibExchg[1] + pcibExchg[3]; /* Let us check whether PCI bios is present */ pcibExchg[0] = pcibEntry; asm(" pusha"); asm(" movl pcibExchg, %edi"); asm(" movb $0xb1, %ah"); asm(" movb $0x01, %al"); asm (" pushl %cs"); asm(" call *%edi"); asm(" movl %eax, pcibExchg"); asm(" movl %ebx, pcibExchg+4"); asm(" movl %ecx, pcibExchg+8"); asm(" movl %edx, pcibExchg+12"); asm(" popa"); if((pcibExchg[0] & 0xff00) != 0) { /* Not found */ assert(0); return PCIB_ERR_NOTPRESENT; } if(pcibExchg[3] != 0x20494350) { /* Signature does not match */ assert(0); return PCIB_ERR_NOTPRESENT; } /* Success */ pcibInitialized = 1; return PCIB_ERR_SUCCESS; } /* * Find specified device and return its signature: combination * of bus number, device number and function number */ int pcib_find_by_devid(int vendorId, int devId, int idx, int *sig) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = vendorId; pcibExchg[2] = devId; pcibExchg[3] = idx; asm(" pusha"); asm(" movl pcibExchg, %edi"); asm(" movb $0xb1, %ah"); asm(" movb $0x02, %al"); asm(" movl pcibExchg+4, %edx"); asm(" movl pcibExchg+8, %ecx"); asm(" movl pcibExchg+12, %esi"); asm(" pushl %cs"); asm(" call *%edi"); asm(" movl %eax, pcibExchg"); asm(" movl %ebx, pcibExchg+4"); asm(" popa"); *sig = pcibExchg[1] & 0xffff; return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } /* * Find specified class code return device signature: combination * of bus number, device number and function number */ int pcib_find_by_class(int classCode, int idx, int *sig) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = classCode; pcibExchg[2] = idx; asm(" pusha"); asm(" movl pcibExchg, %edi"); asm(" movb $0xb1, %ah"); asm(" movb $0x03, %al"); asm(" movl pcibExchg+4, %ecx"); asm(" movl pcibExchg+8, %esi"); asm(" pushl %cs"); asm(" call *%edi"); asm(" movl %eax, pcibExchg"); asm(" movl %ebx, pcibExchg+4"); asm(" popa"); if((pcibExchg[0] & 0xff00) != 0) { return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } *sig = pcibExchg[1] & 0xffff; return PCIB_ERR_SUCCESS; } /* * Generate Special Cycle */ int pcib_special_cycle(int busNo, int data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = busNo << 8; pcibExchg[2] = data; asm(" pusha"); asm(" movl pcibExchg, %edi"); asm(" movb $0xb1, %ah"); asm(" movb $0x06, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edx"); asm(" pushl %cs"); asm(" call *%edi"); asm(" movl %eax, pcibExchg"); asm(" movl %ebx, pcibExchg+4"); asm(" popa"); return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } /* * Read byte from config space */ int pcib_conf_read8(int sig, int off, unsigned char *data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = sig; pcibExchg[2] = off; asm(" pusha"); asm(" movl pcibExchg, %esi"); asm(" movb $0xb1, %ah"); asm(" movb $0x08, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edi"); asm(" pushl %cs"); asm(" call *%esi"); asm(" movl %eax, pcibExchg"); asm(" movl %ecx, pcibExchg+4"); asm(" popa"); if((pcibExchg[0] & 0xff00) != 0) { return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } *data = (unsigned char)pcibExchg[1] & 0xff; return PCIB_ERR_SUCCESS; } /* * Read word from config space */ int pcib_conf_read16(int sig, int off, unsigned short *data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = sig; pcibExchg[2] = off; asm(" pusha"); asm(" movl pcibExchg, %esi"); asm(" movb $0xb1, %ah"); asm(" movb $0x09, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edi"); asm(" pushl %cs"); asm(" call *%esi"); asm(" movl %eax, pcibExchg"); asm(" movl %ecx, pcibExchg+4"); asm(" popa"); if((pcibExchg[0] & 0xff00) != 0) { return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } *data = (unsigned short)pcibExchg[1] & 0xffff; return PCIB_ERR_SUCCESS; } /* * Read dword from config space */ int pcib_conf_read32(int sig, int off, unsigned int *data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = sig; pcibExchg[2] = off; asm(" pusha"); asm(" movl pcibExchg, %esi"); asm(" movb $0xb1, %ah"); asm(" movb $0x0a, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edi"); asm(" pushl %cs"); asm(" call *%esi"); asm(" movl %eax, pcibExchg"); asm(" movl %ecx, pcibExchg+4"); asm(" popa"); if((pcibExchg[0] & 0xff00) != 0) { return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } *data = (unsigned int)pcibExchg[1]; return PCIB_ERR_SUCCESS; } /* * Write byte into config space */ int pcib_conf_write8(int sig, int off, unsigned int data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = sig; pcibExchg[2] = off; pcibExchg[3] = data & 0xff; asm(" pusha"); asm(" movl pcibExchg, %esi"); asm(" movb $0xb1, %ah"); asm(" movb $0x0b, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edi"); asm(" movl pcibExchg+12, %ecx"); asm(" pushl %cs"); asm(" call *%esi"); asm(" movl %eax, pcibExchg"); asm(" popa"); return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } /* * Write word into config space */ int pcib_conf_write16(int sig, int off, unsigned int data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = sig; pcibExchg[2] = off; pcibExchg[3] = data & 0xffff; asm(" pusha"); asm(" movl pcibExchg, %esi"); asm(" movb $0xb1, %ah"); asm(" movb $0x0c, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edi"); asm(" movl pcibExchg+12, %ecx"); asm(" pushl %cs"); asm(" call *%esi"); asm(" movl %eax, pcibExchg"); asm(" popa"); return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } /* * Write dword into config space */ int pcib_conf_write32(int sig, int off, unsigned int data) { if(!pcibInitialized) { assert(0); return PCIB_ERR_UNINITIALIZED; } pcibExchg[0] = pcibEntry; pcibExchg[1] = sig; pcibExchg[2] = off; pcibExchg[3] = data; asm(" pusha"); asm(" movl pcibExchg, %esi"); asm(" movb $0xb1, %ah"); asm(" movb $0x0d, %al"); asm(" movl pcibExchg+4, %ebx"); asm(" movl pcibExchg+8, %edi"); asm(" movl pcibExchg+12, %ecx"); asm(" pushl %cs"); asm(" call *%esi"); asm(" movl %eax, pcibExchg"); asm(" popa"); return pcib_convert_err((pcibExchg[0] >> 8) & 0xff); } static int pcib_convert_err(int err) { switch(err & 0xff) { case 0: return PCIB_ERR_SUCCESS; case 0x81: return PCIB_ERR_NOFUNC; case 0x83: return PCIB_ERR_BADVENDOR; case 0x86: return PCIB_ERR_DEVNOTFOUND; case 0x87: return PCIB_ERR_BADREG; default: assert(0); break; } return PCIB_ERR_NOFUNC; }
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