forked from Imagelibrary/rtems
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/* PCI Access Library
|
|
*
|
|
* COPYRIGHT (c) 2010 Cobham Gaisler AB.
|
|
*
|
|
* The license and distribution terms for this file may be
|
|
* found in the file LICENSE in this distribution or at
|
|
* http://www.rtems.org/license/LICENSE.
|
|
*/
|
|
|
|
#include <pci.h>
|
|
|
|
/* Get PCI I/O or Configuration space access function */
|
|
static int pci_ioc_func(int wr, int size, void **func, void **ops)
|
|
{
|
|
int ofs;
|
|
|
|
ofs = 0;
|
|
if (wr)
|
|
ofs += 3;
|
|
if (size == 4)
|
|
size = 3;
|
|
ofs += (size & 0x3) - 1;
|
|
if (ops[ofs] == NULL)
|
|
return -1;
|
|
if (func)
|
|
*func = ops[ofs];
|
|
return 0;
|
|
}
|
|
|
|
/* Get Registers-over-Memory Space access function */
|
|
static int pci_memreg_func(int wr, int size, void **func, int endian)
|
|
{
|
|
void **ops;
|
|
int ofs = 0;
|
|
|
|
ops = (void **)pci_access_ops.memreg;
|
|
if (!ops)
|
|
return -1;
|
|
|
|
if (size == 2)
|
|
ofs += 2;
|
|
else if (size == 4)
|
|
ofs += 6;
|
|
|
|
if (size != 1 && endian == PCI_BIG_ENDIAN)
|
|
ofs += 2;
|
|
|
|
if (wr)
|
|
ofs += 1;
|
|
|
|
if (ops[ofs] == NULL)
|
|
return -1;
|
|
if (func)
|
|
*func = ops[ofs];
|
|
return 0;
|
|
}
|
|
|
|
/* Get function pointer from Host/BSP driver definitions */
|
|
int pci_access_func(int wr, int size, void **func, int endian, int type)
|
|
{
|
|
switch (type) {
|
|
default:
|
|
case 2: /* Memory Space - not implemented */
|
|
return -1;
|
|
case 1: /* I/O space */
|
|
return pci_ioc_func(wr, size, func, (void**)&pci_access_ops.cfg);
|
|
case 3: /* Registers over Memory space */
|
|
return pci_memreg_func(wr, size, func, endian);
|
|
case 4: /* Configuration space */
|
|
return pci_ioc_func(wr, size, func, (void**)&pci_access_ops.io);
|
|
}
|
|
}
|