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Diffstat (limited to 'kernel/arch/mips/mti-sead3/sead3-setup.c')
-rw-r--r--kernel/arch/mips/mti-sead3/sead3-setup.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/kernel/arch/mips/mti-sead3/sead3-setup.c b/kernel/arch/mips/mti-sead3/sead3-setup.c
new file mode 100644
index 000000000..e43f4801a
--- /dev/null
+++ b/kernel/arch/mips/mti-sead3/sead3-setup.c
@@ -0,0 +1,111 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
+ * Copyright (C) 2013 Imagination Technologies Ltd.
+ */
+#include <linux/init.h>
+#include <linux/libfdt.h>
+#include <linux/of_platform.h>
+#include <linux/of_fdt.h>
+
+#include <asm/prom.h>
+#include <asm/fw/fw.h>
+
+#include <asm/mips-boards/generic.h>
+
+const char *get_system_type(void)
+{
+ return "MIPS SEAD3";
+}
+
+static uint32_t get_memsize_from_cmdline(void)
+{
+ int memsize = 0;
+ char *p = arcs_cmdline;
+ char *s = "memsize=";
+
+ p = strstr(p, s);
+ if (p) {
+ p += strlen(s);
+ memsize = memparse(p, NULL);
+ }
+
+ return memsize;
+}
+
+static uint32_t get_memsize_from_env(void)
+{
+ int memsize = 0;
+ char *p;
+
+ p = fw_getenv("memsize");
+ if (p)
+ memsize = memparse(p, NULL);
+
+ return memsize;
+}
+
+static uint32_t get_memsize(void)
+{
+ uint32_t memsize;
+
+ memsize = get_memsize_from_cmdline();
+ if (memsize)
+ return memsize;
+
+ return get_memsize_from_env();
+}
+
+static void __init parse_memsize_param(void)
+{
+ int offset;
+ const uint64_t *prop_value;
+ int prop_len;
+ uint32_t memsize = get_memsize();
+
+ if (!memsize)
+ return;
+
+ offset = fdt_path_offset(__dtb_start, "/memory");
+ if (offset > 0) {
+ uint64_t new_value;
+ /*
+ * reg contains 2 32-bits BE values, offset and size. We just
+ * want to replace the size value without affecting the offset
+ */
+ prop_value = fdt_getprop(__dtb_start, offset, "reg", &prop_len);
+ new_value = be64_to_cpu(*prop_value);
+ new_value = (new_value & ~0xffffffffllu) | memsize;
+ fdt_setprop_inplace_u64(__dtb_start, offset, "reg", new_value);
+ }
+}
+
+void __init plat_mem_setup(void)
+{
+ /* allow command line/bootloader env to override memory size in DT */
+ parse_memsize_param();
+
+ /*
+ * Load the builtin devicetree. This causes the chosen node to be
+ * parsed resulting in our memory appearing
+ */
+ __dt_setup_arch(__dtb_start);
+}
+
+void __init device_tree_init(void)
+{
+ if (!initial_boot_params)
+ return;
+
+ unflatten_and_copy_device_tree();
+}
+
+static int __init customize_machine(void)
+{
+ of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+ return 0;
+}
+arch_initcall(customize_machine);