[PATCH 02/16] pata_parport: add aten protocol driver

Ondrej Zary
2022-03-05T20:14:47Z

Add ATEN EH-100 protocol driver.

Signed-off-by: Ondrej Zary <linux@zary.sk>
---
drivers/ata/pata_parport/Kconfig | 11 +++
drivers/ata/pata_parport/Makefile | 1 +
drivers/ata/pata_parport/aten.c | 139 ++++++++++++++++++++++++++++++
3 files changed, 151 insertions(+)
create mode 100644 drivers/ata/pata_parport/aten.c

diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
index 56dc6b25d5fa..93b0ad65b523 100644
--- a/drivers/ata/pata_parport/Kconfig
+++ b/drivers/ata/pata_parport/Kconfig
@@ -8,3 +8,14 @@

comment "Parallel IDE protocol modules"
depends on PATA_PARPORT
+
+config PATA_PARPORT_ATEN
+ tristate "ATEN EH-100 protocol"
+ depends on PATA_PARPORT
+ help
+ This option enables support for the ATEN EH-100 parallel port IDE
+ protocol. This protocol is used in some inexpensive low performance
+ parallel port kits made in Hong Kong. If you chose to build PATA_PARPORT
+ support into your kernel, you may answer Y here to build in the
+ protocol driver, otherwise you should answer M to build it as a
+ loadable module. The module will be called aten.
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
index b105e1cb8dc6..7e821b629c58 100644
--- a/drivers/ata/pata_parport/Makefile
+++ b/drivers/ata/pata_parport/Makefile
@@ -7,3 +7,4 @@
#

obj-$(CONFIG_PATA_PARPORT) += pata_parport.o
+obj-$(CONFIG_PATA_PARPORT_ATEN) += aten.o
diff --git a/drivers/ata/pata_parport/aten.c b/drivers/ata/pata_parport/aten.c
new file mode 100644
index 000000000000..a811a471e942
--- /dev/null
+++ b/drivers/ata/pata_parport/aten.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * aten.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
+ * Under the terms of the GNU General Public License.
+ *
+ * aten.c is a low-level protocol driver for the ATEN EH-100
+ * parallel port adapter. The EH-100 supports 4-bit and 8-bit
+ * modes only. There is also an EH-132 which supports EPP mode
+ * transfers. The EH-132 is not yet supported.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/types.h>
+#include <linux/io.h>
+
+#include "pata_parport.h"
+
+#define j44(a, b) ((((a >> 4) & 0x0f) | (b & 0xf0)) ^ 0x88)
+
+/* cont = 0 - access the IDE register file
+ * cont = 1 - access the IDE command set
+ */
+
+static int cont_map[2] = { 0x08, 0x20 };
+
+static void aten_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+ int r = regr + cont_map[cont] + 0x80;
+
+ w0(r); w2(0xe); w2(6); w0(val); w2(7); w2(6); w2(0xc);
+}
+
+static int aten_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+ int a, b, r;
+
+ r = regr + cont_map[cont] + 0x40;
+
+ switch (pi->mode) {
+ case 0:
+ w0(r); w2(0xe); w2(6);
+ w2(7); w2(6); w2(0);
+ a = r1(); w0(0x10); b = r1(); w2(0xc);
+ return j44(a, b);
+ case 1:
+ r |= 0x10;
+ w0(r); w2(0xe); w2(6); w0(0xff);
+ w2(0x27); w2(0x26); w2(0x20);
+ a = r0();
+ w2(0x26); w2(0xc);
+ return a;
+ }
+ return -1;
+}
+
+static void aten_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k, a, b, c, d;
+
+ switch (pi->mode) {
+ case 0:
+ w0(0x48); w2(0xe); w2(6);
+ for (k = 0; k < count / 2; k++) {
+ w2(7); w2(6); w2(2);
+ a = r1(); w0(0x58); b = r1();
+ w2(0); d = r1(); w0(0x48); c = r1();
+ buf[2 * k] = j44(c, d);
+ buf[2 * k + 1] = j44(a, b);
+ }
+ w2(0xc);
+ break;
+ case 1:
+ w0(0x58); w2(0xe); w2(6);
+ for (k = 0; k < count / 2; k++) {
+ w2(0x27); w2(0x26); w2(0x22);
+ a = r0(); w2(0x20); b = r0();
+ buf[2 * k] = b; buf[2 * k + 1] = a;
+ }
+ w2(0x26); w2(0xc);
+ break;
+ }
+}
+
+static void aten_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k;
+
+ w0(0x88); w2(0xe); w2(6);
+ for (k = 0; k < count / 2; k++) {
+ w0(buf[2 * k + 1]); w2(0xe); w2(6);
+ w0(buf[2 * k]); w2(7); w2(6);
+ }
+ w2(0xc);
+}
+
+static void aten_connect(struct pi_adapter *pi)
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(0xc);
+}
+
+static void aten_disconnect(struct pi_adapter *pi)
+{
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+static void aten_log_adapter(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ char *mode_string[2] = { "4-bit", "8-bit" };
+
+ dev_info(&pi->dev, "aten, ATEN EH-100 at 0x%x, mode %d (%s), delay %d\n",
+ pi->port, pi->mode, mode_string[pi->mode], pi->delay);
+}
+
+static struct pi_protocol aten = {
+ .owner = THIS_MODULE,
+ .name = "aten",
+ .max_mode = 2,
+ .epp_first = 2,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = aten_write_regr,
+ .read_regr = aten_read_regr,
+ .write_block = aten_write_block,
+ .read_block = aten_read_block,
+ .connect = aten_connect,
+ .disconnect = aten_disconnect,
+ .log_adapter = aten_log_adapter,
+ .sht = { PATA_PARPORT_SHT("pata_parport-aten") },
+};
+
+MODULE_LICENSE("GPL");
+module_pata_parport_driver(aten);
--
Ondrej Zary