1 files changed, 106 insertions, 0 deletions

diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c
new file mode 100644
index 000000000..3017263ac
--- /dev/null
+++ b/arch/mips/ralink/of.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2013 John Crispin <john@phrozen.org>
+ */
+
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/sizes.h>
+#include <linux/of_fdt.h>
+#include <linux/kernel.h>
+#include <linux/memblock.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;
+EXPORT_SYMBOL_GPL(rt_sysc_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))
+                panic("Failed to request resources for %s", node);
+
+        return ioremap(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)
+{
+        void *dtb = NULL;
+
+        set_io_port_base(KSEG1);
+
+        /*
+         * Load the builtin devicetree. This causes the chosen node to be
+         * parsed resulting in our memory appearing. fw_passed_dtb is used
+         * by CONFIG_MIPS_APPENDED_RAW_DTB as well.
+         */
+        if (fw_passed_dtb)
+                dtb = (void *)fw_passed_dtb;
+        else if (&__dtb_start != &__dtb_end)
+                dtb = (void *)__dtb_start;
+
+        __dt_setup_arch(dtb);
+
+        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)
+                memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
+        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);