1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/misc/altera-stapl/altera-lpt.c b/drivers/misc/altera-stapl/altera-lpt.c
new file mode 100644
index 000000000..2b7d9cf41
--- /dev/null
+++ b/drivers/misc/altera-stapl/altera-lpt.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * altera-lpt.c
+ *
+ * altera FPGA driver
+ *
+ * Copyright (C) Altera Corporation 1998-2001
+ * Copyright (C) 2010 NetUP Inc.
+ * Copyright (C) 2010 Abylay Ospan <aospan@netup.ru>
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include "altera-exprt.h"
+
+static int lpt_hardware_initialized;
+
+static void byteblaster_write(int port, int data)
+{
+	outb((u8)data, (u16)(port + 0x378));
+};
+
+static int byteblaster_read(int port)
+{
+	int data = 0;
+	data = inb((u16)(port + 0x378));
+	return data & 0xff;
+};
+
+int netup_jtag_io_lpt(void *device, int tms, int tdi, int read_tdo)
+{
+	int data = 0;
+	int tdo = 0;
+	int initial_lpt_ctrl = 0;
+
+	if (!lpt_hardware_initialized) {
+		initial_lpt_ctrl = byteblaster_read(2);
+		byteblaster_write(2, (initial_lpt_ctrl | 0x02) & 0xdf);
+		lpt_hardware_initialized = 1;
+	}
+
+	data = ((tdi ? 0x40 : 0) | (tms ? 0x02 : 0));
+
+	byteblaster_write(0, data);
+
+	if (read_tdo) {
+		tdo = byteblaster_read(1);
+		tdo = ((tdo & 0x80) ? 0 : 1);
+	}
+
+	byteblaster_write(0, data | 0x01);
+
+	byteblaster_write(0, data);
+
+	return tdo;
+}