1 files changed, 72 insertions, 0 deletions
diff --git a/bsps/powerpc/mvme5500/pci/detect_host_bridge.c b/bsps/powerpc/mvme5500/pci/detect_host_bridge.c
new file mode 100644
index 0000000000..3bd5b00d7a
--- /dev/null
+++ b/bsps/powerpc/mvme5500/pci/detect_host_bridge.c
@@ -0,0 +1,72 @@
+/*
+ * detect_host_bridge.c
+ *
+ * This code is inspired by detect_grackle_bridge.c of SVGM BSP
+ * written by Till Straumann
+ * Copyright (C) 2001, 2003 Till Straumann <strauman@slac.stanford.edu>
+ *
+ * Copyright (C) 2004 S. Kate Feng, <feng1@bnl.gov>
+ * wrote it to support the MVME5500 board.
+ *
+ */
+#include <libcpu/io.h>
+#include <rtems/bspIo.h>	    /* printk */
+
+#include <bsp/pci.h>
+#include <bsp/gtreg.h>
+#include <bsp/gtpcireg.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+
+#define PCI_DEBUG 0
+
+#define HOSTBRIDGET_ERROR               0xf0000000
+
+unsigned long _BSP_clear_hostbridge_errors(int enableMCP, int quiet)
+{
+  uint32_t pcidata, pcidata1;
+  int PciLocal, busNumber=0;
+
+  /* On the mvme5500 board, the GT64260B system controller had the MCP
+   * signal pulled up high.  Thus, the MCP signal is not used as it is
+   * on other boards such as mvme2307.
+   */
+  if (enableMCP) return(-1);
+  for (PciLocal=0; PciLocal<1; PciLocal++ ) {
+     pci_read_config_dword(busNumber,
+			0,
+			0,
+		        PCI_COMMAND,
+                        &pcidata);
+
+    if (!quiet)
+    printk("Before _BSP_clear_hostbridge_errors(): 0x%" PRIx32 ", cause 0x%lx\n",
+	   pcidata, inl(0x1d58));
+
+    outl(0,0x1d58);
+
+    /* Clear the error on the host bridge */
+    pcidata1= pcidata;
+    pcidata1 |= PCI_STATUS_CLRERR_MASK;
+    pcidata1 |= 0x140;
+    pci_write_config_dword(busNumber,
+ 			       0,
+			       0,
+			  PCI_COMMAND,
+                          pcidata1);
+
+    pci_read_config_dword(busNumber,
+			       0,
+			       0,
+			  PCI_COMMAND,
+                          &pcidata1);
+
+    if (!quiet) printk("After _BSP_clear_hostbridge_errors(): sts 0x%" PRIx32 "\n",
+                        pcidata1);
+    if (pcidata1 & HOSTBRIDGET_ERROR) printk("BSP_clear_hostbridge_errors(): unable to clear pending hostbridge errors\n");
+    busNumber += BSP_MAX_PCI_BUS_ON_PCI0;
+  }
+  return(pcidata &  HOSTBRIDGET_ERROR);
+}