/* $NetBSD: pci_map.c,v 1.12 2002/05/30 12:06:43 drochner Exp $ */
/*-
* Copyright (c) 2004, 2005 Brookhaven National Laboratory
* S. Kate Feng <feng1@bnl.gov>
*
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum; by William R. Studenmund; by Jason R. Thorpe.
*
*/
/*
* PCI device mapping.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <rtems/rtems/types.h>
#include <bsp/pci.h>
#include <bsp/pcireg.h>
extern int pci_get_capability(int b, int d, int f, int capid,int *offset,uint32_t *value);
extern int pci_mem_find(int b, int d, int f, int reg, unsigned *basep,unsigned *sizep);
extern int pci_io_find(int b, int d, int f, int reg,unsigned *basep,unsigned *sizep);
int pci_io_find(int b, int d, int f, int reg,unsigned *basep,unsigned *sizep)
{
uint32_t address, mask;
if (reg < PCI_MAPREG_START ||
#if 0
/*
* Can't do this check; some devices have mapping registers
* way out in left field.
*/
reg >= PCI_MAPREG_END ||
#endif
(reg & 3))
rtems_panic("pci_io_find: bad request");
/*
* Section 6.2.5.1, `Address Maps', tells us that:
*
* 1) The builtin software should have already mapped the device in a
* reasonable way.
*
* 2) A device which wants 2^n bytes of memory will hardwire the bottom
* n bits of the address to 0. As recommended, we write all 1s and see
* what we get back.
*/
pci_read_config_dword(b,d,f,reg, &address);
if ( !(address & PCI_MAPREG_TYPE_IO)) return(1);
pci_write_config_dword(b,d,f,reg, 0xffffffff);
pci_read_config_dword(b,d,f,reg,&mask);
pci_write_config_dword(b,d,f,reg, address);
if ( (*sizep = PCI_MAPREG_IO_SIZE(mask))== 0) {
printk("pci_io_find: void region\n");
return(1);
}
*basep = PCI_MAPREG_IO_ADDR(address);
return(0);
}
int pci_mem_find(int b, int d, int f, int reg, unsigned *basep,unsigned *sizep)
{
uint32_t address, mask;
if (reg < PCI_MAPREG_START ||
#if 0
/*
* Can't do this check; some devices have mapping registers
* way out in left field.
*/
reg >= PCI_MAPREG_END ||
#endif
(reg & 3))
rtems_panic("pci_mem_find: bad request");
pci_read_config_dword(b,d,f,reg, &address);
if (address & PCI_MAPREG_TYPE_IO) {
printk("pci_mem_find: expected type mem, found I/O\n");
return(1);
}
/*
* Section 6.2.5.1, `Address Maps', tells us that:
*
* 1) The builtin software should have already mapped the device in a
* reasonable way.
*
* 2) A device which wants 2^n bytes of memory will hardwire the bottom
* n bits of the address to 0. As recommended, we write all 1s and see
* what we get back.
*/
pci_write_config_dword(b,d,f,reg, 0xffffffff);
pci_read_config_dword(b,d,f,reg,&mask);
pci_write_config_dword(b,d,f,reg, address);
if ( (*sizep = PCI_MAPREG_MEM_SIZE(mask))== 0) {
printk("pci_io_find: void region\n");
return (1);
}
*basep = PCI_MAPREG_MEM_ADDR(address);
return(0);
}
int pci_get_capability(int b, int d, int f, int capid,int *offset,uint32_t *value)
{
uint32_t reg, ofs;
/* i82544EI PCI_CAPLISTPTR_REG */
pci_read_config_dword(b,d,f,PCI_CAPLISTPTR_REG, ®);
ofs = PCI_CAPLIST_PTR(reg);
while (ofs != 0) {
#ifdef DIAGNOSTIC
if ((ofs & 3) || (ofs < 0x40))
panic("pci_get_capability");
#endif
pci_read_config_dword(b,d,f,ofs, ®);
if (PCI_CAPLIST_CAP(reg) == capid) {
if (offset)
*offset = ofs;
if (value)
*value = reg;
return (1);
}
ofs = PCI_CAPLIST_NEXT(reg);
}
return (0);
}
