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-rw-r--r--kernel/arch/mips/ralink/of.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/kernel/arch/mips/ralink/of.c b/kernel/arch/mips/ralink/of.c
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+++ b/kernel/arch/mips/ralink/of.c
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/sizes.h>
+#include <linux/of_fdt.h>
+#include <linux/kernel.h>
+#include <linux/bootmem.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
+#include <asm/reboot.h>
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+#include <asm/prom.h>
+
+#include "common.h"
+
+__iomem void *rt_sysc_membase;
+__iomem void *rt_memc_membase;
+
+__iomem void *plat_of_remap_node(const char *node)
+{
+ struct resource res;
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, node);
+ if (!np)
+ panic("Failed to find %s node", node);
+
+ if (of_address_to_resource(np, 0, &res))
+ panic("Failed to get resource for %s", node);
+
+ if ((request_mem_region(res.start,
+ resource_size(&res),
+ res.name) < 0))
+ panic("Failed to request resources for %s", node);
+
+ return ioremap_nocache(res.start, resource_size(&res));
+}
+
+void __init device_tree_init(void)
+{
+ unflatten_and_copy_device_tree();
+}
+
+static int memory_dtb;
+
+static int __init early_init_dt_find_memory(unsigned long node,
+ const char *uname, int depth, void *data)
+{
+ if (depth == 1 && !strcmp(uname, "memory@0"))
+ memory_dtb = 1;
+
+ return 0;
+}
+
+void __init plat_mem_setup(void)
+{
+ set_io_port_base(KSEG1);
+
+ /*
+ * Load the builtin devicetree. This causes the chosen node to be
+ * parsed resulting in our memory appearing
+ */
+ __dt_setup_arch(__dtb_start);
+
+ strlcpy(arcs_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+
+ of_scan_flat_dt(early_init_dt_find_memory, NULL);
+ if (memory_dtb)
+ of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+ else if (soc_info.mem_size)
+ add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
+ BOOT_MEM_RAM);
+ else
+ detect_memory_region(soc_info.mem_base,
+ soc_info.mem_size_min * SZ_1M,
+ soc_info.mem_size_max * SZ_1M);
+}
+
+static int __init plat_of_setup(void)
+{
+ __dt_register_buses(soc_info.compatible, "palmbus");
+
+ /* make sure that the reset controller is setup early */
+ ralink_rst_init();
+
+ return 0;
+}
+
+arch_initcall(plat_of_setup);