1 files changed, 115 insertions, 0 deletions
diff --git a/arch/nios2/kernel/prom.c b/arch/nios2/kernel/prom.c
new file mode 100644
index 000000000..718dd1979
--- /dev/null
+++ b/arch/nios2/kernel/prom.c
@@ -0,0 +1,115 @@
+/*
+ * Device tree support
+ *
+ * Copyright (C) 2013, 2015 Altera Corporation
+ * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * Based on 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 as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/io.h>
+
+#include <asm/prom.h>
+#include <asm/sections.h>
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+	u64 kernel_start = (u64)virt_to_phys(_text);
+
+	if (!memory_size &&
+	    (kernel_start >= base) && (kernel_start < (base + size)))
+		memory_size = size;
+
+}
+
+void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
+{
+	return alloc_bootmem_align(size, align);
+}
+
+void __init early_init_devtree(void *params)
+{
+	__be32 *dtb = (u32 *)__dtb_start;
+#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
+	if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
+		 OF_DT_HEADER) {
+		params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR;
+		early_init_dt_scan(params);
+		return;
+	}
+#endif
+	if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
+		params = (void *)__dtb_start;
+
+	early_init_dt_scan(params);
+}
+
+#ifdef CONFIG_EARLY_PRINTK
+static int __init early_init_dt_scan_serial(unsigned long node,
+			const char *uname, int depth, void *data)
+{
+	u64 *addr64 = (u64 *) data;
+	const char *p;
+
+	/* only consider serial nodes */
+	if (strncmp(uname, "serial", 6) != 0)
+		return 0;
+
+	p = of_get_flat_dt_prop(node, "compatible", NULL);
+	if (!p)
+		return 0;
+
+	/*
+	 * We found an altera_jtaguart but it wasn't configured for console, so
+	 * skip it.
+	 */
+#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
+	if (strncmp(p, "altr,juart", 10) == 0)
+		return 0;
+#endif
+
+	/*
+	 * Same for altera_uart.
+	 */
+#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
+	if (strncmp(p, "altr,uart", 9) == 0)
+		return 0;
+#endif
+
+	*addr64 = fdt_translate_address((const void *)initial_boot_params,
+		node);
+
+	return *addr64 == OF_BAD_ADDR ? 0 : 1;
+}
+
+unsigned long __init of_early_console(void)
+{
+	u64 base = 0;
+
+	if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
+		return (u32)ioremap(base, 32);
+	else
+		return 0;
+}
+#endif /* CONFIG_EARLY_PRINTK */