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/* SPDX-License-Identifier: BSD-2-Clause */
/* PCI Access Library
*
* COPYRIGHT (c) 2010 Cobham Gaisler AB.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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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