[PATCH 06/16] pata_parport: add dstr protocol driver

Ondrej Zary
2022-03-05T20:15:37Z

Add DataStor EP-2000 protocol driver.

Signed-off-by: Ondrej Zary <linux@zary.sk>
---
drivers/ata/pata_parport/Kconfig | 10 ++
drivers/ata/pata_parport/Makefile | 1 +
drivers/ata/pata_parport/dstr.c | 226 ++++++++++++++++++++++++++++++
3 files changed, 237 insertions(+)
create mode 100644 drivers/ata/pata_parport/dstr.c

diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
index 3cc3d6ae4d45..67f203dfbdca 100644
--- a/drivers/ata/pata_parport/Kconfig
+++ b/drivers/ata/pata_parport/Kconfig
@@ -64,3 +64,13 @@ config PATA_PARPORT_COMM
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 comm.
+
+config PATA_PARPORT_DSTR
+ tristate "DataStor EP-2000 protocol"
+ depends on PATA_PARPORT
+ help
+ This option enables support for the EP-2000 parallel port IDE
+ protocol from DataStor. 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 dstr.
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
index fcb77a855ef6..bf81c4ca32ab 100644
--- a/drivers/ata/pata_parport/Makefile
+++ b/drivers/ata/pata_parport/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_PATA_PARPORT_ATEN) += aten.o
obj-$(CONFIG_PATA_PARPORT_BPCK) += bpck.o
obj-$(CONFIG_PATA_PARPORT_BPCK6) += bpck6.o
obj-$(CONFIG_PATA_PARPORT_COMM) += comm.o
+obj-$(CONFIG_PATA_PARPORT_DSTR) += dstr.o
diff --git a/drivers/ata/pata_parport/dstr.c b/drivers/ata/pata_parport/dstr.c
new file mode 100644
index 000000000000..2e1e078fa467
--- /dev/null
+++ b/drivers/ata/pata_parport/dstr.c
@@ -0,0 +1,226 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * dstr.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
+ * Under the terms of the GNU General Public License.
+ *
+ * dstr.c is a low-level protocol driver for the
+ * DataStor EP2000 parallel to IDE adapter chip.
+ */
+
+#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"
+
+/* mode codes: 0 nybble reads, 8-bit writes
+ * 1 8-bit reads and writes
+ * 2 8-bit EPP mode
+ * 3 EPP-16
+ * 4 EPP-32
+ */
+
+#define j44(a, b) (((a >> 3) & 0x07) | ((~a >> 4) & 0x08) | ((b << 1) & 0x70) | ((~b) & 0x80))
+
+#define P1 do { w2(5); w2(0xd); w2(5); w2(4); } while (0)
+#define P2 do { w2(5); w2(7); w2(5); w2(4); } while (0)
+#define P3 do { w2(6); w2(4); w2(6); w2(4); } while (0)
+
+/* cont = 0 - access the IDE register file
+ * cont = 1 - access the IDE command set
+ */
+
+static int cont_map[2] = { 0x20, 0x40 };
+
+static int dstr_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+ int a, b, r;
+
+ r = regr + cont_map[cont];
+
+ w0(0x81); P1;
+ if (pi->mode)
+ w0(0x11);
+ else
+ w0(1);
+ P2; w0(r); P1;
+
+ switch (pi->mode) {
+ case 0:
+ w2(6); a = r1(); w2(4); w2(6); b = r1(); w2(4);
+ return j44(a, b);
+ case 1:
+ w0(0); w2(0x26); a = r0(); w2(4);
+ return a;
+ case 2:
+ case 3:
+ case 4:
+ w2(0x24); a = r4(); w2(4);
+ return a;
+ }
+ return -1;
+}
+
+static void dstr_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+ int r = regr + cont_map[cont];
+
+ w0(0x81); P1;
+ if (pi->mode >= 2)
+ w0(0x11);
+ else
+ w0(1);
+ P2; w0(r); P1;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ w0(val); w2(5); w2(7); w2(5); w2(4);
+ break;
+ case 2:
+ case 3:
+ case 4:
+ w4(val);
+ break;
+ }
+}
+
+#define CCP(x) do { w0(0xff); w2(0xc); w2(4);\
+ w0(0xaa); w0(0x55); w0(0); w0(0xff); w0(0x87); w0(0x78);\
+ w0(x); w2(5); w2(4);\
+ } while (0)
+
+static void dstr_connect(struct pi_adapter *pi)
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(4); CCP(0xe0); w0(0xff);
+}
+
+static void dstr_disconnect(struct pi_adapter *pi)
+{
+ CCP(0x30);
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+static void dstr_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k, a, b;
+
+ w0(0x81); P1;
+ if (pi->mode)
+ w0(0x19);
+ else
+ w0(9);
+ P2; w0(0x82); P1; P3; w0(0x20); P1;
+
+ switch (pi->mode) {
+ case 0:
+ for (k = 0; k < count; k++) {
+ w2(6); a = r1(); w2(4);
+ w2(6); b = r1(); w2(4);
+ buf[k] = j44(a, b);
+ }
+ break;
+ case 1:
+ w0(0);
+ for (k = 0; k < count; k++) {
+ w2(0x26); buf[k] = r0(); w2(0x24);
+ }
+ w2(4);
+ break;
+ case 2:
+ w2(0x24);
+ for (k = 0; k < count; k++)
+ buf[k] = r4();
+ w2(4);
+ break;
+ case 3:
+ w2(0x24);
+ for (k = 0; k < count / 2; k++)
+ ((u16 *)buf)[k] = r4w();
+ w2(4);
+ break;
+ case 4:
+ w2(0x24);
+ for (k = 0; k < count / 4; k++)
+ ((u32 *)buf)[k] = r4l();
+ w2(4);
+ break;
+ }
+}
+
+static void dstr_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k;
+
+ w0(0x81); P1;
+ if (pi->mode)
+ w0(0x19);
+ else
+ w0(9);
+ P2; w0(0x82); P1; P3; w0(0x20); P1;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ for (k = 0; k < count; k++) {
+ w2(5); w0(buf[k]); w2(7);
+ }
+ w2(5); w2(4);
+ break;
+ case 2:
+ w2(0xc5);
+ for (k = 0; k < count; k++)
+ w4(buf[k]);
+ w2(0xc4);
+ break;
+ case 3:
+ w2(0xc5);
+ for (k = 0; k < count / 2; k++)
+ w4w(((u16 *)buf)[k]);
+ w2(0xc4);
+ break;
+ case 4:
+ w2(0xc5);
+ for (k = 0; k < count / 4; k++)
+ w4l(((u32 *)buf)[k]);
+ w2(0xc4);
+ break;
+ }
+}
+
+
+static void dstr_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, "dstr, DataStor EP2000 at 0x%x, mode %d (%s), delay %d\n",
+ pi->port, pi->mode, mode_string[pi->mode], pi->delay);
+}
+
+static struct pi_protocol dstr = {
+ .owner = THIS_MODULE,
+ .name = "dstr",
+ .max_mode = 5,
+ .epp_first = 2,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = dstr_write_regr,
+ .read_regr = dstr_read_regr,
+ .write_block = dstr_write_block,
+ .read_block = dstr_read_block,
+ .connect = dstr_connect,
+ .disconnect = dstr_disconnect,
+ .log_adapter = dstr_log_adapter,
+ .sht = { PATA_PARPORT_SHT("pata_parport-dstr") },
+};
+
+MODULE_LICENSE("GPL");
+module_pata_parport_driver(dstr);
--
Ondrej Zary