From 037e16396df671074fca9e0348626b724d2c2960 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 9 Aug 2006 21:05:32 +0000
Subject: 2006-08-09	Kolja Waschk <waschk@telos.de>

	* configure.ac: New port to Altera NIOS II.
	* nios2/.cvsignore, nios2/Makefile.am, nios2/README, nios2/bridges.c,
	nios2/bridges.h, nios2/clocks.c, nios2/clocks.h, nios2/configure.ac,
	nios2/devices.c, nios2/devices.h, nios2/nios2gen.c, nios2/output.c,
	nios2/output.h, nios2/ptf.c, nios2/ptf.h: New files.
---
 tools/cpu/nios2/bridges.c | 120 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 tools/cpu/nios2/bridges.c

(limited to 'tools/cpu/nios2/bridges.c')

diff --git a/tools/cpu/nios2/bridges.c b/tools/cpu/nios2/bridges.c
new file mode 100644
index 0000000000..f792d5e1aa
--- /dev/null
+++ b/tools/cpu/nios2/bridges.c
@@ -0,0 +1,120 @@
+/*
+ *  Copyright (c) 2006 Kolja Waschk rtemsdev/ixo.de
+ *
+ *  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.
+ *
+ *  $Id$
+ */
+
+/********************************************************/
+/* Find bus bridges */
+
+/* This part of the program builds a list with pairs of bus
+   master port names (each is "device name/master port name"). 
+   It is then possible to find if a given master is actually
+   available under a different master port name through bridges.
+ */
+
+/* Typical example with external SRAM that is slave of
+   tristate_bridge_0/tristate_master, and
+   tristate_bridge_0 itself is slave of cpu0/data_master, the
+   bridge information would be stored as this bus_bridge_pair:
+      mastered_by = "cpu0/data_master" and 
+      bridges_to = "tristate_bridge_0/tristate_master".
+   That allows to deduce that SRAM is actually mastered by
+   cpu0/data_master. If there were any address or bus width
+   translations, it should be noted in the bridges list... For
+   now we simply assume that bridges never translate anything.
+ */
+
+#include "ptf.h"
+#include "bridges.h"
+
+int is_bridged(
+  char *cpu_master, 
+  char *dev_master, 
+  bus_bridge_pair *bridges)
+{
+  char *curr_master;
+  bus_bridge_pair *bbp;
+
+  curr_master = dev_master;
+  while(curr_master != NULL)
+  {
+    /* Does cpu_master master curr_master? */
+    if(strcmp(cpu_master, curr_master) == 0) return 1; /* yes, cpu_masters cm */
+
+    /* No, cm is attached to a bridge? */
+    bbp = bridges;
+    while(bbp != NULL)
+    {
+      if(strcmp(bbp->bridges_to, curr_master) == 0)
+      {
+        curr_master = bbp->mastered_by;
+        break;
+      };
+      bbp = bbp->next;
+    };
+    if(bbp == NULL) curr_master = NULL;
+  };
+
+  return 0;
+}
+
+void add_bridge_master(struct ptf_item *pi, void *arg)
+{
+    struct { char *bt; bus_bridge_pair **bridges; } *binfo = arg;
+    bus_bridge_pair *new_pair;
+
+    if(binfo->bridges == 0) return;
+
+    new_pair = (bus_bridge_pair *)malloc(sizeof(bus_bridge_pair));
+    if(new_pair == NULL) return;
+
+    new_pair->bridges_to = binfo->bt;
+    new_pair->mastered_by = pi->item[pi->level]->value;
+    new_pair->next = *(binfo->bridges);
+    *(binfo->bridges) = new_pair;
+}
+
+void add_bridge_dest(struct ptf_item *pi, void *arg)
+{
+    struct ptf maby_section = { section, "MASTERED_BY", 0, 0, 0 };
+    struct ptf_item maby = { 1, &maby_section };
+
+    char *bridge_name = pi->item[1]->value;
+    char *bridge_dest = pi->item[pi->level]->value;
+    struct { char *bt; bus_bridge_pair **bridges; } binfo;
+
+    binfo.bridges = arg;
+    binfo.bt = (char*)malloc(strlen(bridge_name)+strlen(bridge_dest) + 2);
+    strcpy(binfo.bt, bridge_name);
+    strcat(binfo.bt, "/");
+    strcat(binfo.bt, bridge_dest);
+
+    ptf_match(pi->item[pi->level-1]->sub, &maby, add_bridge_master, &binfo);
+
+    /* binfo.bt is NOT freed here */
+}
+
+bus_bridge_pair *find_bridges(struct ptf *p)
+{
+    bus_bridge_pair *bridges = 0;
+
+    struct ptf system     = { section, "SYSTEM", 0, 0, 0 };
+    struct ptf module     = { section, "MODULE", 0, 0, 0 };
+    struct ptf slave      = { section, "SLAVE",  0, 0, 0 };
+    struct ptf syb        = { section, "SYSTEM_BUILDER_INFO", 0, 0, 0 };
+    struct ptf to         = { item,    "Bridges_To", 0, 0, 0 };
+    struct ptf_item brdg  = { 5, &system, &module, &slave, &syb, &to };
+
+    ptf_match(p, &brdg, add_bridge_dest, &bridges);
+
+    return bridges;
+}
+
+
+
+
-- 
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