LIBPCI: added PCI layer to cpukit/libpci

cpukit/libpci/pci_access.c

@@ -0,0 +1,74 @@
+/*  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>
+#include <pci/access.h>
+
+/* Access Routines valid after a PCI-Access-Driver has registered */
+struct pci_access_drv pci_access_ops = {
+	.cfg = {.read8 = 0},
+};
+
+/* Read a 8-bit register over configuration space */
+int pci_cfg_r8(pci_dev_t dev, int ofs, uint8_t *data)
+{
+	return pci_access_ops.cfg.read8(dev, ofs, data);
+}
+
+/* Read a 16-bit register over configuration space */
+int pci_cfg_r16(pci_dev_t dev, int ofs, uint16_t *data)
+{
+	return pci_access_ops.cfg.read16(dev, ofs, data);
+}
+
+/* Read a 32-bit register over configuration space */
+int pci_cfg_r32(pci_dev_t dev, int ofs, uint32_t *data)
+{
+	return pci_access_ops.cfg.read32(dev, ofs, data);
+}
+
+/* Write a 8-bit register over configuration space */
+int pci_cfg_w8(pci_dev_t dev, int ofs, uint8_t data)
+{
+	return pci_access_ops.cfg.write8(dev, ofs, data);
+}
+
+/* Write a 16-bit register over configuration space */
+int pci_cfg_w16(pci_dev_t dev, int ofs, uint16_t data)
+{
+	return pci_access_ops.cfg.write16(dev, ofs, data);
+}
+
+/* Write a 32-bit register over configuration space */
+int pci_cfg_w32(pci_dev_t dev, int ofs, uint32_t data)
+{
+	return pci_access_ops.cfg.write32(dev, ofs, data);
+}
+
+void pci_modify_cmdsts(pci_dev_t dev, uint32_t mask, uint32_t val)
+{
+	uint32_t data;
+
+	pci_cfg_r32(dev, PCI_COMMAND, &data);
+	data &= ~mask;
+	data |= val;
+	pci_cfg_w32(dev, PCI_COMMAND, data);
+}
+
+/* Register a driver for handling access to PCI */
+int pci_access_drv_register(struct pci_access_drv *drv)
+{
+	if (pci_access_ops.cfg.read8)
+		return -1; /* Already registered a driver.. */
+
+	pci_access_ops = *drv;
+
+	return 0;
+}