forked from Imagelibrary/rtems
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* PCI Access Library
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*
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* COPYRIGHT (c) 2010 Cobham Gaisler AB.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <pci.h>
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/* Get PCI I/O or Configuration space access function */
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static int pci_ioc_func(int wr, int size, void **func, void **ops)
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{
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int ofs;
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ofs = 0;
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if (wr)
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ofs += 3;
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if (size == 4)
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size = 3;
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ofs += (size & 0x3) - 1;
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if (ops[ofs] == NULL)
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return -1;
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if (func)
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*func = ops[ofs];
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return 0;
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}
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/* Get Registers-over-Memory Space access function */
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static int pci_memreg_func(int wr, int size, void **func, int endian)
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{
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void **ops;
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int ofs = 0;
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ops = (void **)pci_access_ops.memreg;
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if (!ops)
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return -1;
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if (size == 2)
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ofs += 2;
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else if (size == 4)
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ofs += 6;
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if (size != 1 && endian == PCI_BIG_ENDIAN)
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ofs += 2;
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if (wr)
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ofs += 1;
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if (ops[ofs] == NULL)
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return -1;
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if (func)
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*func = ops[ofs];
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return 0;
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}
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/* Get function pointer from Host/BSP driver definitions */
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int pci_access_func(int wr, int size, void **func, int endian, int type)
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{
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switch (type) {
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default:
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case 2: /* Memory Space - not implemented */
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return -1;
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case 1: /* I/O space */
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return pci_ioc_func(wr, size, func, (void**)&pci_access_ops.cfg);
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case 3: /* Registers over Memory space */
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return pci_memreg_func(wr, size, func, endian);
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case 4: /* Configuration space */
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return pci_ioc_func(wr, size, func, (void**)&pci_access_ops.io);
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}
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}
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