From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 arch/mips/kernel/prom.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 arch/mips/kernel/prom.c

(limited to 'arch/mips/kernel/prom.c')

diff --git a/arch/mips/kernel/prom.c b/arch/mips/kernel/prom.c
new file mode 100644
index 00000000..32b87882
--- /dev/null
+++ b/arch/mips/kernel/prom.c
@@ -0,0 +1,113 @@
+/*
+ * MIPS support for CONFIG_OF device tree support
+ *
+ * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
+ *
+ * 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/export.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/initrd.h>
+#include <linux/debugfs.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+
+#include <asm/page.h>
+#include <asm/prom.h>
+
+static char mips_machine_name[64] = "Unknown";
+
+__init void mips_set_machine_name(const char *name)
+{
+	if (name == NULL)
+		return;
+
+	strncpy(mips_machine_name, name, sizeof(mips_machine_name));
+	pr_info("MIPS: machine is %s\n", mips_get_machine_name());
+}
+
+char *mips_get_machine_name(void)
+{
+	return mips_machine_name;
+}
+
+#ifdef CONFIG_OF
+int __init early_init_dt_scan_memory_arch(unsigned long node,
+					  const char *uname, int depth,
+					  void *data)
+{
+	return early_init_dt_scan_memory(node, uname, depth, data);
+}
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+	return add_memory_region(base, size, BOOT_MEM_RAM);
+}
+
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+	return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
+{
+	initrd_start = (unsigned long)__va(start);
+	initrd_end = (unsigned long)__va(end);
+	initrd_below_start_ok = 1;
+}
+#endif
+
+int __init early_init_dt_scan_model(unsigned long node,	const char *uname,
+				    int depth, void *data)
+{
+	if (!depth) {
+		char *model = of_get_flat_dt_prop(node, "model", NULL);
+
+		if (model)
+			mips_set_machine_name(model);
+	}
+	return 0;
+}
+
+void __init early_init_devtree(void *params)
+{
+	/* Setup flat device-tree pointer */
+	initial_boot_params = params;
+
+	/* Retrieve various informations from the /chosen node of the
+	 * device-tree, including the platform type, initrd location and
+	 * size, and more ...
+	 */
+	of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
+
+
+	/* Scan memory nodes */
+	of_scan_flat_dt(early_init_dt_scan_root, NULL);
+	of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
+
+	/* try to load the mips machine name */
+	of_scan_flat_dt(early_init_dt_scan_model, NULL);
+}
+
+void __init __dt_setup_arch(struct boot_param_header *bph)
+{
+	if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
+		pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
+
+		return;
+	}
+
+	initial_boot_params = bph;
+
+	early_init_devtree(initial_boot_params);
+}
+#endif
-- 
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