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authorVineet Gupta <vgupta@synopsys.com>2013-01-22 17:00:52 +0530
committerVineet Gupta <vgupta@synopsys.com>2013-02-15 23:15:55 +0530
commit999159a5381bff3bd6f688c5d20fbec9d8789e53 (patch)
treed54af343e2fa905b3d97d9dd87d763a43b256067 /arch/arc/kernel/devtree.c
parentee36d1722112f33725ec1a7fc02f6c46e630fd27 (diff)
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ARC: [DeviceTree] Basic support
This is minimal infrastructure needed for devicetree work. It uses an a sample "skeleton" devicetree - embedded in kernel image - to print the board, manufacturer by parsing the top-level "compatible" string. As of now we don't need any additional "board" specific "machine_desc". TODO: support interpreting the command line as boot-loader passed dtb Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: devicetree-discuss@lists.ozlabs.org Cc: Rob Herring <rob.herring@calxeda.com> Cc: James Hogan <james.hogan@imgtec.com> Reviewed-by: Rob Herring <rob.herring@calxeda.com> Reviewed-by: James Hogan <james.hogan@imgtec.com>
Diffstat (limited to 'arch/arc/kernel/devtree.c')
-rw-r--r--arch/arc/kernel/devtree.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c
new file mode 100644
index 000000000000..48e157efad15
--- /dev/null
+++ b/arch/arc/kernel/devtree.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Based on reduced version of METAG
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include <linux/init.h>
+#include <linux/reboot.h>
+#include <linux/memblock.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <asm/prom.h>
+
+/* called from unflatten_device_tree() to bootstrap devicetree itself */
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+ return __va(memblock_alloc(size, align));
+}
+
+/**
+ * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
+ * @dt: virtual address pointer to dt blob
+ *
+ * If a dtb was passed to the kernel, then use it to choose the correct
+ * machine_desc and to setup the system.
+ */
+int __init setup_machine_fdt(void *dt)
+{
+ struct boot_param_header *devtree = dt;
+ unsigned long dt_root;
+ char *model, *compat;
+ char manufacturer[16];
+
+ /* check device tree validity */
+ if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
+ return 1;
+
+ /* Search the mdescs for the 'best' compatible value match */
+ initial_boot_params = devtree;
+ dt_root = of_get_flat_dt_root();
+
+ /* compat = "<manufacturer>,<model>" */
+ compat = of_get_flat_dt_prop(dt_root, "compatible", NULL);
+ if (!compat)
+ compat = "<unknown>";
+
+ model = strchr(compat, ',');
+ if (model)
+ model++;
+
+ strlcpy(manufacturer, compat, model ? model - compat : strlen(compat));
+
+ pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer);
+
+ /* Retrieve various information from the /chosen node */
+ of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
+
+ return 0;
+}
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