原始版本

RT_Thread/components/drivers/pci/ecam.h

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-10-24     GuEe-GUI     first version
+ */
+
+#ifndef __RT_PCI_ECAM_H__
+#define __RT_PCI_ECAM_H__
+
+#include <drivers/pci.h>
+#include <drivers/ofw.h>
+#include <drivers/ofw_io.h>
+#include <drivers/platform.h>
+
+/*
+ * Memory address shift values for the byte-level address that
+ * can be used when accessing the PCI Express Configuration Space.
+ */
+
+/*
+ * Enhanced Configuration Access Mechanism (ECAM)
+ *
+ * See PCI Express Base Specification, Revision 5.0, Version 1.0,
+ * Section 7.2.2, Table 7-1, p. 677.
+ */
+#define PCIE_ECAM_BUS_SHIFT     20 /* Bus number */
+#define PCIE_ECAM_DEVFN_SHIFT   12 /* Device and Function number */
+
+#define PCIE_ECAM_BUS_MASK      0xff
+#define PCIE_ECAM_DEVFN_MASK    0xff
+#define PCIE_ECAM_REG_MASK      0xfff /* Limit offset to a maximum of 4K */
+
+#define PCIE_ECAM_BUS(x)        (((x) & PCIE_ECAM_BUS_MASK) << PCIE_ECAM_BUS_SHIFT)
+#define PCIE_ECAM_DEVFN(x)      (((x) & PCIE_ECAM_DEVFN_MASK) << PCIE_ECAM_DEVFN_SHIFT)
+#define PCIE_ECAM_REG(x)        ((x) & PCIE_ECAM_REG_MASK)
+
+#define PCIE_ECAM_OFFSET(bus, devfn, where) \
+        (PCIE_ECAM_BUS(bus) |  PCIE_ECAM_DEVFN(devfn) | PCIE_ECAM_REG(where))
+
+struct pci_ecam_ops
+{
+    rt_uint32_t bus_shift;
+    const struct rt_pci_ops pci_ops;
+};
+
+struct pci_ecam_config_window
+{
+    rt_uint32_t *bus_range;
+    rt_uint32_t bus_shift;
+
+    void *win;
+    void *priv;
+    const struct pci_ecam_ops *ops;
+};
+
+/* Default ECAM ops */
+extern const struct pci_ecam_ops pci_generic_ecam_ops;
+
+void *pci_ecam_map(struct rt_pci_bus *bus, rt_uint32_t devfn, int where);
+struct pci_ecam_config_window *pci_ecam_create(struct rt_pci_host_bridge *host_bridge,
+        const struct pci_ecam_ops *ops);
+rt_err_t pci_host_common_probe(struct rt_platform_device *pdev);
+rt_err_t pci_host_common_remove(struct rt_platform_device *pdev);
+
+#endif /* __RT_PCI_ECAM_H__ */