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/* 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.com/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);
}
}
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