[PATCH 12/16] pata_parport: add frpw protocol driver

Ondrej Zary
2022-03-05T20:15:28Z

Add FreeCom power 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/frpw.c | 292 ++++++++++++++++++++++++++++++
3 files changed, 303 insertions(+)
create mode 100644 drivers/ata/pata_parport/frpw.c

diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
index 8a569ee0bf6a..d8e5feaaae7a 100644
--- a/drivers/ata/pata_parport/Kconfig
+++ b/drivers/ata/pata_parport/Kconfig
@@ -132,3 +132,13 @@ config PATA_PARPORT_FRIQ
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.
+
+config PATA_PARPORT_FRPW
+ tristate "FreeCom power protocol"
+ depends on PATA_PARPORT
+ help
+ This option enables support for the Freecom power parallel port IDE
+ protocol. 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 frpw.
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
index 20d05e525c95..136374be9613 100644
--- a/drivers/ata/pata_parport/Makefile
+++ b/drivers/ata/pata_parport/Makefile
@@ -17,3 +17,4 @@ 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
+obj-$(CONFIG_PATA_PARPORT_FRPW) += frpw.o
diff --git a/drivers/ata/pata_parport/frpw.c b/drivers/ata/pata_parport/frpw.c
new file mode 100644
index 000000000000..5151d3c26361
--- /dev/null
+++ b/drivers/ata/pata_parport/frpw.c
@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * frpw.c (c) 1996-8 Grant R. Guenther <grant@torque.net>
+ * Under the terms of the GNU General Public License
+ *
+ * frpw.c is a low-level protocol driver for the Freecom "Power"
+ * parallel port IDE adapter.
+ *
+ * Some applications of this adapter may require a "printer" reset
+ * prior to loading the driver. This can be done by loading and
+ * unloading the "lp" driver, or it can be done by this driver
+ * if you define FRPW_HARD_RESET. The latter is not recommended
+ * as it may upset devices on other ports.
+ */
+
+#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 cec4 do { w2(0xc); w2(0xe); w2(0xe); w2(0xc); w2(4); w2(4); w2(4); } 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 frpw_read_regr(struct pi_adapter *pi, int cont, int regr)
+{
+ int h, l, r;
+
+ r = regr + cont_map[cont];
+
+ w2(4);
+ w0(r); cec4;
+ w2(6); l = r1();
+ w2(4); h = r1();
+ w2(4);
+
+ return j44(l, h);
+}
+
+static void frpw_write_regr(struct pi_adapter *pi, int cont, int regr, int val)
+{
+ int r = regr + cont_map[cont];
+
+ w2(4); w0(r); cec4;
+ w0(val);
+ w2(5); w2(7); w2(5); w2(4);
+}
+
+static void frpw_read_block_int(struct pi_adapter *pi, char *buf, int count, int regr)
+{
+ int h, l, k, ph;
+
+ switch (pi->mode) {
+ case 0:
+ w2(4); w0(regr); cec4;
+ 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;
+ w2(4); w0(regr + 0xc0); cec4;
+ 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:
+ w2(4); w0(regr + 0x80); cec4;
+ for (k = 0; k < count; k++)
+ buf[k] = r4();
+ w2(0xac); w2(0xa4);
+ w2(4);
+ break;
+ case 3:
+ w2(4); w0(regr + 0x80); cec4;
+ 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 4:
+ w2(4); w0(regr + 0x80); cec4;
+ 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 5:
+ w2(4); w0(regr + 0x80); cec4;
+ 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 frpw_read_block(struct pi_adapter *pi, char *buf, int count)
+{
+ frpw_read_block_int(pi, buf, count, 0x08);
+}
+
+static void frpw_write_block(struct pi_adapter *pi, char *buf, int count)
+{
+ int k;
+
+ switch (pi->mode) {
+ case 0:
+ case 1:
+ case 2:
+ w2(4); w0(8); cec4; w2(5);
+ for (k = 0; k < count; k++) {
+ w0(buf[k]);
+ w2(7); w2(5);
+ }
+ w2(4);
+ break;
+ case 3:
+ w2(4); w0(0xc8); cec4; w2(5);
+ for (k = 0; k < count; k++)
+ w4(buf[k]);
+ w2(4);
+ break;
+ case 4:
+ w2(4); w0(0xc8); cec4; w2(5);
+ for (k = 0; k < count / 2; k++)
+ w4w(((u16 *)buf)[k]);
+ w2(4);
+ break;
+ case 5:
+ w2(4); w0(0xc8); cec4; w2(5);
+ for (k = 0; k < count / 4; k++)
+ w4l(((u32 *)buf)[k]);
+ w2(4);
+ break;
+ }
+}
+
+static void frpw_connect(struct pi_adapter *pi)
+{
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+ w2(4);
+}
+
+static void frpw_disconnect(struct pi_adapter *pi)
+{
+ w2(4); w0(0x20); cec4;
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+}
+
+/* Stub logic to see if PNP string is available - used to distinguish
+ * between the Xilinx and ASIC implementations of the Freecom adapter.
+ *
+ * returns chip_type: 0 = Xilinx, 1 = ASIC
+ */
+
+static int frpw_test_pnp(struct pi_adapter *pi)
+{
+ int olddelay, a, b;
+
+#ifdef FRPW_HARD_RESET
+ w0(0); w2(8); udelay(50); w2(0xc); /* parallel bus reset */
+ mdelay(1500);
+#endif
+
+ olddelay = pi->delay;
+ pi->delay = 10;
+
+ pi->saved_r0 = r0();
+ pi->saved_r2 = r2();
+
+ w2(4); w0(4); w2(6); w2(7);
+ a = r1() & 0xff; w2(4); b = r1() & 0xff;
+ w2(0xc); w2(0xe); w2(4);
+
+ pi->delay = olddelay;
+ w0(pi->saved_r0);
+ w2(pi->saved_r2);
+
+ return ((~a & 0x40) && (b & 0x40));
+}
+
+/* We use the pi->private to remember the result of the PNP test.
+ * To make this work, private = port*2 + chip. Yes, I know it's a hack :-(
+ */
+
+static int frpw_test_proto(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ int j, k, r;
+ int e[2] = { 0, 0 };
+
+ if ((pi->private>>1) != pi->port)
+ pi->private = frpw_test_pnp(pi) + 2 * pi->port;
+
+ if (((pi->private % 2) == 0) && (pi->mode > 2)) {
+ if (verbose)
+ dev_info(&pi->dev, "frpw: Xilinx does not support mode %d\n",
+ pi->mode);
+ return 1;
+ }
+
+ if (((pi->private % 2) == 1) && (pi->mode == 2)) {
+ if (verbose)
+ dev_info(&pi->dev, "frpw: ASIC does not support mode 2\n");
+ return 1;
+ }
+
+ frpw_connect(pi);
+ for (j = 0; j < 2; j++) {
+ frpw_write_regr(pi, 0, 6, 0xa0 + j * 0x10);
+ for (k = 0; k < 256; k++) {
+ frpw_write_regr(pi, 0, 2, k ^ 0xaa);
+ frpw_write_regr(pi, 0, 3, k ^ 0x55);
+ if (frpw_read_regr(pi, 0, 2) != (k ^ 0xaa))
+ e[j]++;
+ }
+ }
+ frpw_disconnect(pi);
+
+ frpw_connect(pi);
+ frpw_read_block_int(pi, scratch, 512, 0x10);
+ r = 0;
+ for (k = 0; k < 128; k++)
+ if (scratch[k] != k)
+ r++;
+ frpw_disconnect(pi);
+
+ if (verbose)
+ dev_info(&pi->dev, "frpw: port 0x%x, chip %ld, mode %d, test=(%d,%d,%d)\n",
+ pi->port, (pi->private % 2), pi->mode, e[0], e[1], r);
+
+ return (r || (e[0] && e[1]));
+}
+
+
+static void frpw_log_adapter(struct pi_adapter *pi, char *scratch, int verbose)
+{
+ static char * const mode_string[] = {
+ "4-bit", "8-bit", "EPP", "EPP-8", "EPP-16", "EPP-32" };
+
+ dev_info(&pi->dev, "frpw, Freecom (%s) adapter at 0x%x, mode %d (%s), delay %d\n",
+ ((pi->private % 2) == 0) ? "Xilinx" : "ASIC", pi->port,
+ pi->mode, mode_string[pi->mode], pi->delay);
+}
+
+static struct pi_protocol frpw = {
+ .owner = THIS_MODULE,
+ .name = "frpw",
+ .max_mode = 6,
+ .epp_first = 2,
+ .default_delay = 2,
+ .max_units = 1,
+ .write_regr = frpw_write_regr,
+ .read_regr = frpw_read_regr,
+ .write_block = frpw_write_block,
+ .read_block = frpw_read_block,
+ .connect = frpw_connect,
+ .disconnect = frpw_disconnect,
+ .test_proto = frpw_test_proto,
+ .log_adapter = frpw_log_adapter,
+ .sht = { PATA_PARPORT_SHT("pata_parport-frpw") },
+};
+
+MODULE_LICENSE("GPL");
+module_pata_parport_driver(frpw);
--
Ondrej Zary