Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/arch/mips/fw/arc/promlib.c b/arch/mips/fw/arc/promlib.c
new file mode 100644
index 000000000..be381307f
--- /dev/null
+++ b/arch/mips/fw/arc/promlib.c
@@ -0,0 +1,44 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@sgi.com)
+ * Compatibility with board caches, Ulf Carlsson
+ */
+#include <linux/kernel.h>
+#include <asm/sgialib.h>
+#include <asm/bcache.h>
+#include <asm/setup.h>
+
+/*
+ * IP22 boardcache is not compatible with board caches.	 Thus we disable it
+ * during romvec action.  Since r4xx0.c is always compiled and linked with your
+ * kernel, this shouldn't cause any harm regardless what MIPS processor you
+ * have.
+ *
+ * The ARC write and read functions seem to interfere with the serial lines
+ * in some way. You should be careful with them.
+ */
+
+void prom_putchar(char c)
+{
+	ULONG cnt;
+	CHAR it = c;
+
+	bc_disable();
+	ArcWrite(1, &it, 1, &cnt);
+	bc_enable();
+}
+
+char prom_getchar(void)
+{
+	ULONG cnt;
+	CHAR c;
+
+	bc_disable();
+	ArcRead(0, &c, 1, &cnt);
+	bc_enable();
+
+	return c;
+}