1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/ktti.c b/drivers/ata/pata_parport/ktti.c
new file mode 100644
index 0000000000..c078d19348
--- /dev/null
+++ b/drivers/ata/pata_parport/ktti.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (c) 1998  Grant R. Guenther <grant@torque.net>
+ *
+ * ktti.c is a low-level protocol driver for the KT Technology
+ * parallel port adapter.  This adapter is used in the "PHd"
+ * portable hard-drives.  As far as I can tell, this device
+ * supports 4-bit mode _only_.
+*/
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <asm/io.h>
+#include "pata_parport.h"
+
+#define j44(a, b)	(((a >> 4) & 0x0f) | (b & 0xf0))
+
+/*
+ * cont = 0 - access the IDE register file
+ * cont = 1 - access the IDE command set
+ */
+static int cont_map[2] = { 0x10, 0x08 };
+
+static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+	int r = regr + cont_map[cont];
+
+	w0(r); w2(0xb); w2(0xa); w2(3); w2(6);
+	w0(val); w2(3); w0(0); w2(6); w2(0xb);
+}
+
+static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+	int a, b, r;
+
+        r = regr + cont_map[cont];
+
+	w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
+	a = r1(); w2(0xc);  b = r1(); w2(9); w2(0xc); w2(9);
+	return j44(a, b);
+}
+
+static void ktti_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+	int k, a, b;
+
+	for (k = 0; k < count / 2; k++) {
+		w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9);
+		a = r1(); w2(0xc); b = r1(); w2(9);
+		buf[2*k] = j44(a, b);
+		a = r1(); w2(0xc); b = r1(); w2(9);
+		buf[2*k+1] = j44(a, b);
+	}
+}
+
+static void ktti_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+	int k;
+
+	for (k = 0; k < count / 2; k++) {
+		w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6);
+		w0(buf[2 * k]); w2(3);
+		w0(buf[2 * k + 1]); w2(6);
+		w2(0xb);
+	}
+}
+
+static void ktti_connect(struct pi_adapter *pi)
+{
+	pi->saved_r0 = r0();
+	pi->saved_r2 = r2();
+	w2(0xb); w2(0xa); w0(0); w2(3); w2(6);
+}
+
+static void ktti_disconnect(struct pi_adapter *pi)
+{
+	w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4);
+	w0(pi->saved_r0);
+	w2(pi->saved_r2);
+}
+
+static void ktti_log_adapter(struct pi_adapter *pi)
+{
+	dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n",
+		 pi->port, pi->delay);
+}
+
+static struct pi_protocol ktti = {
+	.owner		= THIS_MODULE,
+	.name		= "ktti",
+	.max_mode	= 1,
+	.epp_first	= 2,
+	.default_delay	= 1,
+	.max_units	= 1,
+	.write_regr	= ktti_write_regr,
+	.read_regr	= ktti_read_regr,
+	.write_block	= ktti_write_block,
+	.read_block	= ktti_read_block,
+	.connect	= ktti_connect,
+	.disconnect	= ktti_disconnect,
+	.log_adapter	= ktti_log_adapter,
+};
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
+MODULE_DESCRIPTION("KT Technology parallel port IDE adapter protocol driver");
+module_pata_parport_driver(ktti);