[PATCH 16/16] pata_parport: add on26 protocol driver

Ondrej Zary
2022-03-05T20:15:24Z

Add OnSpec 90c26 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/on26.c | 302 ++++++++++++++++++++++++++++++
3 files changed, 314 insertions(+)
create mode 100644 drivers/ata/pata_parport/on26.c

diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
index c18757464b1d..5d3440f372fc 100644
--- a/drivers/ata/pata_parport/Kconfig
+++ b/drivers/ata/pata_parport/Kconfig
@@ -176,3 +176,14 @@ config PATA_PARPORT_ON20
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 on20.
+
+config PATA_PARPORT_ON26
+ tristate "OnSpec 90c26 protocol"
+ depends on PATA_PARPORT
+ help
+ This option enables support for the 90c26 parallel port IDE protocol
+ from OnSpec Electronics (often marketed under the ValuStore brand
+ name). 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 on26.
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
index 4358d1d946cb..2b03a5a9131a 100644
--- a/drivers/ata/pata_parport/Makefile
+++ b/drivers/ata/pata_parport/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_PATA_PARPORT_FRPW) += frpw.o
obj-$(CONFIG_PATA_PARPORT_KBIC) += kbic.o
obj-$(CONFIG_PATA_PARPORT_KTTI) += ktti.o
obj-$(CONFIG_PATA_PARPORT_ON20) += on20.o
+obj-$(CONFIG_PATA_PARPORT_ON26) += on26.o
diff --git a/drivers/ata/pata_parport/on26.c b/drivers/ata/pata_parport/on26.c
new file mode 100644
index 000000000000..1f224bb38b4a
--- /dev/null
+++ b/drivers/ata/pata_parport/on26.c
@@ -0,0 +1,302 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * on26.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
+ * Under the terms of the GNU General Public License.
+ *
+ * on26.c is a low-level protocol driver for the
+ * OnSpec 90c26 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 >> 4) & 0x0f) | (b & 0xf0))
+
+#define P1 do { w2(5); w2(0xd); w2(5); w2(0xd); w2(5); w2(4); } while (0)
+#define P2 do { w2(5); w2(7); w2(5); w2(4); } while (0)
+
+/* cont = 0 - access the IDE register file
+ * cont = 1 - access the IDE command set
+ */
+
+static int on26_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+ int a, b, r;
+
+ r = (regr << 2) + 1 + cont;
+
+ switch (pi->mode) {
+ case 0:
+ w0(1); P1; w0(r); P2; w0(0); P1;
+ w2(6); a = r1(); w2(4);
+ w2(6); b = r1(); w2(4);
+ w2(6); w2(4); w2(6); w2(4);
+ return j44(a, b);
+ case 1:
+ w0(1); P1; w0(r); P2; w0(0); P1;
+ w2(0x26); a = r0(); w2(4); w2(0x26); w2(4);
+ return a;
+ case 2:
+ case 3:
+ case 4:
+ w3(1); w3(1); w2(5); w4(r); w2(4);
+ w3(0); w3(0); w2(0x24); a = r4(); w2(4);
+ w2(0x24); (void)r4(); w2(4);
+ return a;
+ }
+ return -1;
+}
+
+static void on26_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+ int r = (regr<<2) + 1 + cont;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ w0(1); P1; w0(r); P2; w0(0); P1;
+ w0(val); P2; w0(val); P2;
+ break;
+ case 2:
+ case 3:
+ case 4:
+ w3(1); w3(1); w2(5); w4(r); w2(4);
+ w3(0); w3(0);
+ w2(5); w4(val); w2(4);
+ w2(5); w4(val); w2(4);
+ break;
+ }
+}
+
+#define CCP(x) do { w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff);\
+ w0(0x87); w0(0x78); w0(x); w2(4); w2(5); w2(4); w0(0xff);\
+ } while (0)
+
+static void on26_connect(struct pi_adapter *pi)
+{
+ int x;
+
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+
+ CCP(0x20);
+ x = 8;
+ if (pi->mode)
+ x = 9;
+
+ w0(2); P1; w0(8); P2;
+ w0(2); P1; w0(x); P2;
+}
+
+static void on26_disconnect(struct pi_adapter *pi)
+{
+ if (pi->mode >= 2) {
+ w3(4); w3(4); w3(4); w3(4);
+ } else {
+ w0(4); P1; w0(4); P1;
+ }
+ CCP(0x30);
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+#define RESET_WAIT 200
+
+static int on26_test_port(struct pi_adapter *pi) /* hard reset */
+{
+ int i, m, d, x = 0, y = 0;
+
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+
+ d = pi->delay;
+ m = pi->mode;
+ pi->delay = 5;
+ pi->mode = 0;
+
+ w2(0xc);
+
+ CCP(0x30); CCP(0);
+
+ w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff);
+ i = ((r1() & 0xf0) << 4); w0(0x87);
+ i |= (r1() & 0xf0); w0(0x78);
+ w0(0x20); w2(4); w2(5);
+ i |= ((r1() & 0xf0) >> 4);
+ w2(4); w0(0xff);
+
+ if (i == 0xb5f) {
+ w0(2); P1; w0(0); P2;
+ w0(3); P1; w0(0); P2;
+ w0(2); P1; w0(8); P2; udelay(100);
+ w0(2); P1; w0(0xa); P2; udelay(100);
+ w0(2); P1; w0(8); P2; udelay(1000);
+
+ on26_write_regr(pi, 0, 6, 0xa0);
+
+ for (i = 0; i < RESET_WAIT; i++) {
+ on26_write_regr(pi, 0, 6, 0xa0);
+ x = on26_read_regr(pi, 0, 7);
+ on26_write_regr(pi, 0, 6, 0xb0);
+ y = on26_read_regr(pi, 0, 7);
+ if (!((x & 0x80) || (y & 0x80)))
+ break;
+ mdelay(100);
+ }
+
+ if (i == RESET_WAIT)
+ dev_err(&pi->dev, "on26: Device reset failed (%x,%x)\n", x, y);
+
+ w0(4); P1; w0(4); P1;
+ }
+
+ CCP(0x30);
+
+ pi->delay = d;
+ pi->mode = m;
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+
+ return 5;
+}
+
+
+static void on26_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k, a, b;
+
+ switch (pi->mode) {
+ case 0:
+ w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1;
+ udelay(10);
+ for (k = 0; k < count; k++) {
+ w2(6); a = r1();
+ w2(4); b = r1();
+ buf[k] = j44(a, b);
+ }
+ w0(2); P1; w0(8); P2;
+ break;
+ case 1:
+ w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1;
+ udelay(10);
+ for (k = 0; k < count / 2; k++) {
+ w2(0x26); buf[2 * k] = r0();
+ w2(0x24); buf[2 * k + 1] = r0();
+ }
+ w0(2); P1; w0(9); P2;
+ break;
+ case 2:
+ w3(1); w3(1); w2(5); w4(1); w2(4);
+ w3(0); w3(0); w2(0x24);
+ udelay(10);
+ for (k = 0; k < count; k++)
+ buf[k] = r4();
+ w2(4);
+ break;
+ case 3:
+ w3(1); w3(1); w2(5); w4(1); w2(4);
+ w3(0); w3(0); w2(0x24);
+ udelay(10);
+ for (k = 0; k < count / 2; k++)
+ ((u16 *)buf)[k] = r4w();
+ w2(4);
+ break;
+ case 4:
+ w3(1); w3(1); w2(5); w4(1); w2(4);
+ w3(0); w3(0); w2(0x24);
+ udelay(10);
+ for (k = 0; k < count / 4; k++)
+ ((u32 *)buf)[k] = r4l();
+ w2(4);
+ break;
+ }
+}
+
+static void on26_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ w0(1); P1; w0(1); P2;
+ w0(2); P1; w0(0x18 + pi->mode); P2; w0(0); P1;
+ udelay(10);
+ for (k = 0; k < count / 2; k++) {
+ w2(5); w0(buf[2 * k]);
+ w2(7); w0(buf[2 * k + 1]);
+ }
+ w2(5); w2(4);
+ w0(2); P1; w0(8 + pi->mode); P2;
+ break;
+ case 2:
+ w3(1); w3(1); w2(5); w4(1); w2(4);
+ w3(0); w3(0); w2(0xc5);
+ udelay(10);
+ for (k = 0; k < count; k++)
+ w4(buf[k]);
+ w2(0xc4);
+ break;
+ case 3:
+ w3(1); w3(1); w2(5); w4(1); w2(4);
+ w3(0); w3(0); w2(0xc5);
+ udelay(10);
+ for (k = 0; k < count / 2; k++)
+ w4w(((u16 *)buf)[k]);
+ w2(0xc4);
+ break;
+ case 4:
+ w3(1); w3(1); w2(5); w4(1); w2(4);
+ w3(0); w3(0); w2(0xc5);
+ udelay(10);
+ for (k = 0; k < count / 4; k++)
+ w4l(((u32 *)buf)[k]);
+ w2(0xc4);
+ break;
+ }
+}
+
+static void on26_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, "on26, OnSpec 90c26 at 0x%x, mode %d (%s), delay %d\n",
+ pi->port, pi->mode, mode_string[pi->mode], pi->delay);
+}
+
+static struct pi_protocol on26 = {
+ .owner = THIS_MODULE,
+ .name = "on26",
+ .max_mode = 5,
+ .epp_first = 2,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = on26_write_regr,
+ .read_regr = on26_read_regr,
+ .write_block = on26_write_block,
+ .read_block = on26_read_block,
+ .connect = on26_connect,
+ .disconnect = on26_disconnect,
+ .test_port = on26_test_port,
+ .log_adapter = on26_log_adapter,
+ .sht = { PATA_PARPORT_SHT("pata_parport-on26") },
+};
+
+MODULE_LICENSE("GPL");
+module_pata_parport_driver(on26);
--
Ondrej Zary