[PATCH 11/16] pata_parport: add friq protocol driver

Ondrej Zary
2022-03-05T20:15:07Z

Add Freecom IQ ASIC-2 protocol driver.

Signed-off-by: Ondrej Zary <linux@zary.sk>
---
drivers/ata/pata_parport/Kconfig | 12 ++
drivers/ata/pata_parport/Makefile | 1 +
drivers/ata/pata_parport/friq.c | 263 ++++++++++++++++++++++++++++++
3 files changed, 276 insertions(+)
create mode 100644 drivers/ata/pata_parport/friq.c

diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
index 832ab8b00511..8a569ee0bf6a 100644
--- a/drivers/ata/pata_parport/Kconfig
+++ b/drivers/ata/pata_parport/Kconfig
@@ -120,3 +120,15 @@ config PATA_PARPORT_EPIA
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 epia.
+
+config PATA_PARPORT_FRIQ
+ tristate "Freecom IQ ASIC-2 protocol"
+ depends on PATA_PARPORT
+ help
+ This option enables support for version 2 of the Freecom IQ parallel
+ port IDE adapter. This adapter is used by the Maxell Superdisk
+ drive. 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 friq. You must also have a high-level driver for the type
+ of device that you want to support.
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
index 6e72778f45cb..20d05e525c95 100644
--- a/drivers/ata/pata_parport/Makefile
+++ b/drivers/ata/pata_parport/Makefile
@@ -16,3 +16,4 @@ obj-$(CONFIG_PATA_PARPORT_FIT2) += fit2.o
obj-$(CONFIG_PATA_PARPORT_FIT3) += fit3.o
obj-$(CONFIG_PATA_PARPORT_EPAT) += epat.o
obj-$(CONFIG_PATA_PARPORT_EPIA) += epia.o
+obj-$(CONFIG_PATA_PARPORT_FRIQ) += friq.o
diff --git a/drivers/ata/pata_parport/friq.c b/drivers/ata/pata_parport/friq.c
new file mode 100644
index 000000000000..73dabeb7c3d3
--- /dev/null
+++ b/drivers/ata/pata_parport/friq.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * friq.c (c) 1998 Grant R. Guenther <grant@torque.net>
+ * Under the terms of the GNU General Public License
+ *
+ * friq.c is a low-level protocol driver for the Freecom "IQ"
+ * parallel port IDE adapter. Early versions of this adapter
+ * use the 'frpw' protocol.
+ *
+ * Freecom uses this adapter in a battery powered external
+ * CD-ROM drive. It is also used in LS-120 drives by
+ * Maxell and Panasonic, and other devices.
+ *
+ * The battery powered drive requires software support to
+ * control the power to the drive. This module enables the
+ * drive power when the high level driver (pcd) is loaded
+ * and disables it when the module is unloaded. Note, if
+ * the friq module is built in to the kernel, the power
+ * will never be switched off, so other means should be
+ * used to conserve battery power.
+ */
+
+#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 <linux/io.h>
+
+#include "pata_parport.h"
+
+#define CMD(x) do { w2(4); w0(0xff); w0(0xff); w0(0x73); w0(0x73);\
+ w0(0xc9); w0(0xc9); w0(0x26); w0(0x26); w0(x); w0(x);\
+ } while (0)
+
+#define j44(l, h) (((l >> 4) & 0x0f) | (h & 0xf0))
+
+/* cont = 0 - access the IDE register file
+ * cont = 1 - access the IDE command set
+ */
+
+static int cont_map[2] = { 0x08, 0x10 };
+
+static int friq_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+ int h, l, r;
+
+ r = regr + cont_map[cont];
+
+ CMD(r);
+ w2(6); l = r1();
+ w2(4); h = r1();
+ w2(4);
+
+ return j44(l, h);
+
+}
+
+static void friq_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+ int r = regr + cont_map[cont];
+
+ CMD(r);
+ w0(val);
+ w2(5); w2(7); w2(5); w2(4);
+}
+
+static void friq_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr)
+{
+ int h, l, k, ph;
+
+ switch (pi->mode) {
+
+ case 0:
+ CMD(regr);
+ for (k = 0; k < count; k++) {
+ w2(6); l = r1();
+ w2(4); h = r1();
+ buf[k] = j44(l, h);
+ }
+ w2(4);
+ break;
+ case 1:
+ ph = 2;
+ CMD(regr + 0xc0);
+ w0(0xff);
+ for (k = 0; k < count; k++) {
+ w2(0xa4 + ph);
+ buf[k] = r0();
+ ph = 2 - ph;
+ }
+ w2(0xac); w2(0xa4); w2(4);
+ break;
+ case 2:
+ CMD(regr + 0x80);
+ for (k = 0; k < count - 2; k++)
+ buf[k] = r4();
+ w2(0xac); w2(0xa4);
+ buf[count - 2] = r4();
+ buf[count - 1] = r4();
+ w2(4);
+ break;
+ case 3:
+ CMD(regr + 0x80);
+ for (k = 0; k < (count / 2) - 1; k++)
+ ((u16 *)buf)[k] = r4w();
+ w2(0xac); w2(0xa4);
+ buf[count - 2] = r4();
+ buf[count - 1] = r4();
+ w2(4);
+ break;
+ case 4:
+ CMD(regr + 0x80);
+ for (k = 0; k < (count / 4) - 1; k++)
+ ((u32 *)buf)[k] = r4l();
+ buf[count - 4] = r4();
+ buf[count - 3] = r4();
+ w2(0xac); w2(0xa4);
+ buf[count - 2] = r4();
+ buf[count - 1] = r4();
+ w2(4);
+ break;
+ }
+}
+
+static void friq_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+ friq_read_block_int(pi, buf, count, 0x08);
+}
+
+static void friq_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ CMD(8); w2(5);
+ for (k = 0; k < count; k++) {
+ w0(buf[k]);
+ w2(7); w2(5);
+ }
+ w2(4);
+ break;
+ case 2:
+ CMD(0xc8); w2(5);
+ for (k = 0; k < count; k++)
+ w4(buf[k]);
+ w2(4);
+ break;
+ case 3:
+ CMD(0xc8); w2(5);
+ for (k = 0; k < count / 2; k++)
+ w4w(((u16 *)buf)[k]);
+ w2(4);
+ break;
+ case 4:
+ CMD(0xc8); w2(5);
+ for (k = 0; k < count / 4; k++)
+ w4l(((u32 *)buf)[k]);
+ w2(4);
+ break;
+ }
+}
+
+static void friq_connect(struct pi_adapter *pi)
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(4);
+}
+
+static void friq_disconnect(struct pi_adapter *pi)
+{
+ CMD(0x20);
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+static int friq_test_proto(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ int j, k, r;
+ int e[2] = { 0, 0 };
+
+ pi->saved_r0 = r0();
+ w0(0xff); udelay(20); CMD(0x3d); /* turn the power on */
+ udelay(500);
+ w0(pi->saved_r0);
+
+ friq_connect(pi);
+ for (j = 0; j < 2; j++) {
+ friq_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
+ for (k = 0; k < 256; k++) {
+ friq_write_regr(pi, 0, 2, k ^ 0xaa);
+ friq_write_regr(pi, 0, 3, k ^ 0x55);
+ if (friq_read_regr(pi, 0, 2) != (k ^ 0xaa))
+ e[j]++;
+ }
+ }
+ friq_disconnect(pi);
+
+ friq_connect(pi);
+ friq_read_block_int(pi, scratch, 512, 0x10);
+ r = 0;
+ for (k = 0; k < 128; k++)
+ if (scratch[k] != k)
+ r++;
+ friq_disconnect(pi);
+
+ if (verbose)
+ dev_info(&pi->dev, "friq: port 0x%x, mode %d, test=(%d,%d,%d)\n",
+ pi->port, pi->mode, e[0], e[1], r);
+
+ return (r || (e[0] && e[1]));
+}
+
+
+static void friq_log_adapter(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ static char * const mode_string[] = {
+ "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
+
+ dev_info(&pi->dev, "friq, Freecom IQ ASIC-2 adapter at 0x%x, mode %d (%s), delay %d\n",
+ pi->port, pi->mode, mode_string[pi->mode], pi->delay);
+
+ pi->private = 1;
+ friq_connect(pi);
+ CMD(0x9e); /* disable sleep timer */
+ friq_disconnect(pi);
+}
+
+static void friq_release_proto(struct pi_adapter *pi)
+{
+ if (pi->private) { /* turn off the power */
+ friq_connect(pi);
+ CMD(0x1d); CMD(0x1e);
+ friq_disconnect(pi);
+ pi->private = 0;
+ }
+}
+
+static struct pi_protocol friq = {
+ .owner = THIS_MODULE,
+ .name = "friq",
+ .max_mode = 5,
+ .epp_first = 2,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = friq_write_regr,
+ .read_regr = friq_read_regr,
+ .write_block = friq_write_block,
+ .read_block = friq_read_block,
+ .connect = friq_connect,
+ .disconnect = friq_disconnect,
+ .test_proto = friq_test_proto,
+ .log_adapter = friq_log_adapter,
+ .release_proto = friq_release_proto,
+ .sht = { PATA_PARPORT_SHT("pata_parport-friq") },
+};
+
+MODULE_LICENSE("GPL");
+module_pata_parport_driver(friq);
--
Ondrej Zary