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authorJoel Sherrill <joel.sherrill@OARcorp.com>2006-08-09 21:05:32 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>2006-08-09 21:05:32 +0000
commit037e16396df671074fca9e0348626b724d2c2960 (patch)
tree09dd6fa9a7d56dab4284ef1416fed604dc84965d /tools/cpu/nios2/bridges.c
parent28b8d3afaae1bd6a3ecd1f3017faf23c08937526 (diff)
downloadrtems-037e16396df671074fca9e0348626b724d2c2960.tar.bz2
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.
Diffstat (limited to 'tools/cpu/nios2/bridges.c')
-rw-r--r--tools/cpu/nios2/bridges.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/tools/cpu/nios2/bridges.c b/tools/cpu/nios2/bridges.c
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+/*
+ * 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;
+}
+
+
+
+