From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/microblaze/kernel/prom.c | 116 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 arch/microblaze/kernel/prom.c

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

diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
new file mode 100644
index 000000000..68f099960
--- /dev/null
+++ b/arch/microblaze/kernel/prom.c
@@ -0,0 +1,116 @@
+/*
+ * Procedures for creating, accessing and interpreting the device tree.
+ *
+ * Paul Mackerras	August 1996.
+ * Copyright (C) 1996-2005 Paul Mackerras.
+ *
+ *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
+ *    {engebret|bergner}@us.ibm.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.
+ */
+
+#include <stdarg.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/threads.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/stringify.h>
+#include <linux/delay.h>
+#include <linux/initrd.h>
+#include <linux/bitops.h>
+#include <linux/kexec.h>
+#include <linux/debugfs.h>
+#include <linux/irq.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/irq.h>
+#include <linux/io.h>
+#include <asm/mmu.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/pci-bridge.h>
+
+#ifdef CONFIG_EARLY_PRINTK
+static const char *stdout;
+
+static int __init early_init_dt_scan_chosen_serial(unsigned long node,
+				const char *uname, int depth, void *data)
+{
+	int l;
+	const char *p;
+
+	pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
+
+	if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
+				strcmp(uname, "chosen@0") == 0)) {
+		p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
+		if (p != NULL && l > 0)
+			stdout = p; /* store pointer to stdout-path */
+	}
+
+	if (stdout && strstr(stdout, uname)) {
+		p = of_get_flat_dt_prop(node, "compatible", &l);
+		pr_debug("Compatible string: %s\n", p);
+
+		if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
+			(strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
+			unsigned int addr;
+
+			*(u32 *)data = UART16550;
+
+			addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
+			addr += *(u32 *)of_get_flat_dt_prop(node,
+							"reg-offset", &l);
+			/* clear register offset */
+			return be32_to_cpu(addr) & ~3;
+		}
+		if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
+				(strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
+				(strncmp(p, "xlnx,axi-uartlite", 17) == 0) ||
+				(strncmp(p, "xlnx,mdm", 8) == 0)) {
+			const unsigned int *addrp;
+
+			*(u32 *)data = UARTLITE;
+
+			addrp = of_get_flat_dt_prop(node, "reg", &l);
+			return be32_to_cpup(addrp); /* return address */
+		}
+	}
+	return 0;
+}
+
+/* this function is looking for early console - Microblaze specific */
+int __init of_early_console(void *version)
+{
+	return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
+}
+#endif
+
+void __init early_init_devtree(void *params)
+{
+	pr_debug(" -> early_init_devtree(%p)\n", params);
+
+	early_init_dt_scan(params);
+	if (!strlen(boot_command_line))
+		strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
+
+	parse_early_param();
+
+	memblock_allow_resize();
+
+	pr_debug("Phys. mem: %lx\n", (unsigned long) memblock_phys_mem_size());
+
+	pr_debug(" <- early_init_devtree()\n");
+}
-- 
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