LIBPCI: added PCI layer to cpukit/libpci

cpukit/libpci/pci_access_func.c

@@ -0,0 +1,73 @@
+/*  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);
+	}
+}