[PATCH 13/16] pata_parport: add kbic protocol driver

Ondrej Zary
2022-03-05T20:15:12Z

Add KingByte KBIC-951A/971A 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/kbic.c | 292 ++++++++++++++++++++++++++++++
3 files changed, 305 insertions(+)
create mode 100644 drivers/ata/pata_parport/kbic.c

diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
index d8e5feaaae7a..004e5cf708f1 100644
--- a/drivers/ata/pata_parport/Kconfig
+++ b/drivers/ata/pata_parport/Kconfig
@@ -142,3 +142,15 @@ config PATA_PARPORT_FRPW
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 frpw.
+
+config PATA_PARPORT_KBIC
+ tristate "KingByte KBIC-951A/971A protocols"
+ depends on PATA_PARPORT
+ help
+ This option enables support for the KBIC-951A and KBIC-971A parallel
+ port IDE protocols from KingByte Information Corp. KingByte's
+ adapters appear in many no-name portable disk and CD-ROM products,
+ especially in Europe. 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 kbic.
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
index 136374be9613..e82fded22da3 100644
--- a/drivers/ata/pata_parport/Makefile
+++ b/drivers/ata/pata_parport/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_PATA_PARPORT_EPAT) += epat.o
obj-$(CONFIG_PATA_PARPORT_EPIA) += epia.o
obj-$(CONFIG_PATA_PARPORT_FRIQ) += friq.o
obj-$(CONFIG_PATA_PARPORT_FRPW) += frpw.o
+obj-$(CONFIG_PATA_PARPORT_KBIC) += kbic.o
diff --git a/drivers/ata/pata_parport/kbic.c b/drivers/ata/pata_parport/kbic.c
new file mode 100644
index 000000000000..49f8a88db2a2
--- /dev/null
+++ b/drivers/ata/pata_parport/kbic.c
@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kbic.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
+ * Under the terms of the GNU General Public License.
+ *
+ * This is a low-level driver for the KBIC-951A and KBIC-971A
+ * parallel to IDE adapter chips from KingByte Information Systems.
+ *
+ * The chips are almost identical, however, the wakeup code
+ * required for the 971A interferes with the correct operation of
+ * the 951A, so this driver registers itself twice, once for
+ * each 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"
+
+#define r12w() (delay_p, inw(pi->port + 1) & 0xffff)
+
+#define j44(a, b) ((((a >> 4) & 0x0f) | (b & 0xf0)) ^ 0x88)
+#define j53(w) (((w >> 3) & 0x1f) | ((w >> 4) & 0xe0))
+
+
+/* cont = 0 - access the IDE register file
+ * cont = 1 - access the IDE command set
+ */
+
+static int cont_map[2] = { 0x80, 0x40 };
+
+static int kbic_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+ int a, b, s;
+
+ s = cont_map[cont];
+
+ switch (pi->mode) {
+ case 0:
+ w0(regr | 0x18 | s); w2(4); w2(6); w2(4); w2(1); w0(8);
+ a = r1(); w0(0x28); b = r1(); w2(4);
+ return j44(a, b);
+ case 1:
+ w0(regr | 0x38 | s); w2(4); w2(6); w2(4); w2(5); w0(8);
+ a = r12w(); w2(4);
+ return j53(a);
+ case 2:
+ w0(regr | 0x08 | s); w2(4); w2(6); w2(4); w2(0xa5); w2(0xa1);
+ a = r0(); w2(4);
+ return a;
+ case 3:
+ case 4:
+ case 5:
+ w0(0x20 | s); w2(4); w2(6); w2(4); w3(regr);
+ a = r4(); b = r4(); w2(4); w2(0); w2(4);
+ return a;
+ }
+ return -1;
+}
+
+static void kbic_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+ int s = cont_map[cont];
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ case 2:
+ w0(regr | 0x10 | s); w2(4); w2(6); w2(4);
+ w0(val); w2(5); w2(4);
+ break;
+ case 3:
+ case 4:
+ case 5:
+ w0(0x20 | s); w2(4); w2(6); w2(4); w3(regr);
+ w4(val); w4(val);
+ w2(4); w2(0); w2(4);
+ break;
+ }
+}
+
+static void k951_connect(struct pi_adapter *pi)
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(4);
+}
+
+static void k951_disconnect(struct pi_adapter *pi)
+{
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+#define CCP(x) do { w2(0xc4); w0(0xaa); w0(0x55); w0(0); w0(0xff); w0(0x87);\
+ w0(0x78); w0(x); w2(0xc5); w2(0xc4); w0(0xff);\
+ } while (0)
+
+static void k971_connect(struct pi_adapter *pi)
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ CCP(0x20);
+ w2(4);
+}
+
+static void k971_disconnect(struct pi_adapter *pi)
+{
+ CCP(0x30);
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+/* counts must be congruent to 0 MOD 4, but all known applications
+ * have this property.
+ */
+
+static void kbic_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k, a, b;
+
+ switch (pi->mode) {
+ case 0:
+ w0(0x98); w2(4); w2(6); w2(4);
+ for (k = 0; k < count/2; k++) {
+ w2(1); w0(8); a = r1();
+ w0(0x28); b = r1();
+ buf[2 * k] = j44(a, b);
+ w2(5); b = r1();
+ w0(8); a = r1();
+ buf[2 * k + 1] = j44(a, b);
+ w2(4);
+ }
+ break;
+ case 1:
+ w0(0xb8); w2(4); w2(6); w2(4);
+ for (k = 0; k < count / 4; k++) {
+ w0(0xb8);
+ w2(4); w2(5);
+ w0(8); buf[4 * k] = j53(r12w());
+ w0(0xb8); buf[4 * k + 1] = j53(r12w());
+ w2(4); w2(5);
+ buf[4 * k + 3] = j53(r12w());
+ w0(8); buf[4 * k + 2] = j53(r12w());
+ }
+ w2(4);
+ break;
+ case 2:
+ w0(0x88); w2(4); w2(6); w2(4);
+ for (k = 0; k < count / 2; k++) {
+ w2(0xa0); w2(0xa1); buf[2 * k] = r0();
+ w2(0xa5); buf[2 * k + 1] = r0();
+ }
+ w2(4);
+ break;
+ case 3:
+ w0(0xa0); w2(4); w2(6); w2(4); w3(0);
+ for (k = 0; k < count; k++)
+ buf[k] = r4();
+ w2(4); w2(0); w2(4);
+ break;
+ case 4:
+ w0(0xa0); w2(4); w2(6); w2(4); w3(0);
+ for (k = 0; k < count / 2; k++)
+ ((u16 *)buf)[k] = r4w();
+ w2(4); w2(0); w2(4);
+ break;
+ case 5:
+ w0(0xa0); w2(4); w2(6); w2(4); w3(0);
+ for (k = 0; k < count / 4; k++)
+ ((u32 *)buf)[k] = r4l();
+ w2(4); w2(0); w2(4);
+ break;
+ }
+}
+
+static void kbic_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ case 2:
+ w0(0x90); w2(4); w2(6); w2(4);
+ for (k = 0; k < count / 2; k++) {
+ w0(buf[2 * k + 1]); w2(0); w2(4);
+ w0(buf[2 * k]); w2(5); w2(4);
+ }
+ break;
+ case 3:
+ w0(0xa0); w2(4); w2(6); w2(4); w3(0);
+ for (k = 0; k < count / 2; k++) {
+ w4(buf[2 * k + 1]);
+ w4(buf[2 * k]);
+ }
+ w2(4); w2(0); w2(4);
+ break;
+ case 4:
+ w0(0xa0); w2(4); w2(6); w2(4); w3(0);
+ for (k = 0; k < count / 2; k++)
+ w4w(pi_swab16(buf, k));
+ w2(4); w2(0); w2(4);
+ break;
+ case 5:
+ w0(0xa0); w2(4); w2(6); w2(4); w3(0);
+ for (k = 0; k < count / 4; k++)
+ w4l(pi_swab32(buf, k));
+ w2(4); w2(0); w2(4);
+ break;
+ }
+}
+
+static void kbic_log_adapter(struct pi_adapter *pi, char *scratch, int verbose, char *chip)
+{
+ static char * const mode_string[] = {
+ "4-bit", "5/3", "8-bit", "EPP-8", "EPP_16", "EPP-32"};
+
+ dev_info(&pi->dev, "kbic, KingByte %s at 0x%x, mode %d (%s), delay %d\n",
+ chip, pi->port, pi->mode, mode_string[pi->mode], pi->delay);
+}
+
+static void k951_log_adapter(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ kbic_log_adapter(pi, scratch, verbose, "KBIC-951A");
+}
+
+static void k971_log_adapter(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ kbic_log_adapter(pi, scratch, verbose, "KBIC-971A");
+}
+
+static struct pi_protocol k951 = {
+ .owner = THIS_MODULE,
+ .name = "k951",
+ .max_mode = 6,
+ .epp_first = 3,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = kbic_write_regr,
+ .read_regr = kbic_read_regr,
+ .write_block = kbic_write_block,
+ .read_block = kbic_read_block,
+ .connect = k951_connect,
+ .disconnect = k951_disconnect,
+ .log_adapter = k951_log_adapter,
+};
+
+static struct pi_protocol k971 = {
+ .owner = THIS_MODULE,
+ .name = "k971",
+ .max_mode = 6,
+ .epp_first = 3,
+ .default_delay = 1,
+ .max_units = 1,
+ .write_regr = kbic_write_regr,
+ .read_regr = kbic_read_regr,
+ .write_block = kbic_write_block,
+ .read_block = kbic_read_block,
+ .connect = k971_connect,
+ .disconnect = k971_disconnect,
+ .log_adapter = k971_log_adapter,
+ .sht = { PATA_PARPORT_SHT("pata_parport-kbic") },
+};
+
+static int __init kbic_init(void)
+{
+ int rv;
+
+ rv = pata_parport_register_driver(&k951);
+ if (rv < 0)
+ return rv;
+ rv = pata_parport_register_driver(&k971);
+ if (rv < 0)
+ pata_parport_unregister_driver(&k951);
+ return rv;
+}
+
+static void __exit kbic_exit(void)
+{
+ pata_parport_unregister_driver(&k951);
+ pata_parport_unregister_driver(&k971);
+}
+
+MODULE_LICENSE("GPL");
+module_init(kbic_init)
+module_exit(kbic_exit)
--
Ondrej Zary