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path: root/drivers/ata/pata_parport/bpck6.c
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Diffstat (limited to 'drivers/ata/pata_parport/bpck6.c')
-rw-r--r--drivers/ata/pata_parport/bpck6.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/drivers/ata/pata_parport/bpck6.c b/drivers/ata/pata_parport/bpck6.c
new file mode 100644
index 000000000000..62c2b53325e1
--- /dev/null
+++ b/drivers/ata/pata_parport/bpck6.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (c) 2001 Micro Solutions Inc.
+ *
+ * backpack.c is a low-level protocol driver for the Micro Solutions
+ * "BACKPACK" parallel port IDE adapter (works on Series 6 drives).
+ *
+ * Written by: Ken Hahn (linux-dev@micro-solutions.com)
+ * Clive Turvey (linux-dev@micro-solutions.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/parport.h>
+#include "pata_parport.h"
+
+/* 60772 Commands */
+#define ACCESS_REG 0x00
+#define ACCESS_PORT 0x40
+
+#define ACCESS_READ 0x00
+#define ACCESS_WRITE 0x20
+
+/* 60772 Command Prefix */
+#define CMD_PREFIX_SET 0xe0 // Special command that modifies next command's operation
+#define CMD_PREFIX_RESET 0xc0 // Resets current cmd modifier reg bits
+ #define PREFIX_IO16 0x01 // perform 16-bit wide I/O
+ #define PREFIX_FASTWR 0x04 // enable PPC mode fast-write
+ #define PREFIX_BLK 0x08 // enable block transfer mode
+
+/* 60772 Registers */
+#define REG_STATUS 0x00 // status register
+ #define STATUS_IRQA 0x01 // Peripheral IRQA line
+ #define STATUS_EEPROM_DO 0x40 // Serial EEPROM data bit
+#define REG_VERSION 0x01 // PPC version register (read)
+#define REG_HWCFG 0x02 // Hardware Config register
+#define REG_RAMSIZE 0x03 // Size of RAM Buffer
+ #define RAMSIZE_128K 0x02
+#define REG_EEPROM 0x06 // EEPROM control register
+ #define EEPROM_SK 0x01 // eeprom SK bit
+ #define EEPROM_DI 0x02 // eeprom DI bit
+ #define EEPROM_CS 0x04 // eeprom CS bit
+ #define EEPROM_EN 0x08 // eeprom output enable
+#define REG_BLKSIZE 0x08 // Block transfer len (24 bit)
+
+/* flags */
+#define fifo_wait 0x10
+
+/* DONT CHANGE THESE LEST YOU BREAK EVERYTHING - BIT FIELD DEPENDENCIES */
+#define PPCMODE_UNI_SW 0
+#define PPCMODE_UNI_FW 1
+#define PPCMODE_BI_SW 2
+#define PPCMODE_BI_FW 3
+#define PPCMODE_EPP_BYTE 4
+#define PPCMODE_EPP_WORD 5
+#define PPCMODE_EPP_DWORD 6
+
+static int mode_map[] = { PPCMODE_UNI_FW, PPCMODE_BI_FW, PPCMODE_EPP_BYTE,
+ PPCMODE_EPP_WORD, PPCMODE_EPP_DWORD };
+
+static void bpck6_send_cmd(struct pi_adapter *pi, u8 cmd)
+{
+ switch (mode_map[pi->mode]) {
+ case PPCMODE_UNI_SW:
+ case PPCMODE_UNI_FW:
+ case PPCMODE_BI_SW:
+ case PPCMODE_BI_FW:
+ parport_write_data(pi->pardev->port, cmd);
+ parport_frob_control(pi->pardev->port, 0, PARPORT_CONTROL_AUTOFD);
+ break;
+ case PPCMODE_EPP_BYTE:
+ case PPCMODE_EPP_WORD:
+ case PPCMODE_EPP_DWORD:
+ pi->pardev->port->ops->epp_write_addr(pi->pardev->port, &cmd, 1, 0);
+ break;
+ }
+}
+
+static u8 bpck6_rd_data_byte(struct pi_adapter *pi)
+{
+ u8 data = 0;
+
+ switch (mode_map[pi->mode]) {
+ case PPCMODE_UNI_SW:
+ case PPCMODE_UNI_FW:
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_INIT);
+ data = parport_read_status(pi->pardev->port);
+ data = ((data & 0x80) >> 1) | ((data & 0x38) >> 3);
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_STROBE);
+ data |= parport_read_status(pi->pardev->port) & 0xB8;
+ break;
+ case PPCMODE_BI_SW:
+ case PPCMODE_BI_FW:
+ parport_data_reverse(pi->pardev->port);
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);
+ data = parport_read_data(pi->pardev->port);
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE, 0);
+ parport_data_forward(pi->pardev->port);
+ break;
+ case PPCMODE_EPP_BYTE:
+ case PPCMODE_EPP_WORD:
+ case PPCMODE_EPP_DWORD:
+ pi->pardev->port->ops->epp_read_data(pi->pardev->port, &data, 1, 0);
+ break;
+ }
+
+ return data;
+}
+
+static void bpck6_wr_data_byte(struct pi_adapter *pi, u8 data)
+{
+ switch (mode_map[pi->mode]) {
+ case PPCMODE_UNI_SW:
+ case PPCMODE_UNI_FW:
+ case PPCMODE_BI_SW:
+ case PPCMODE_BI_FW:
+ parport_write_data(pi->pardev->port, data);
+ parport_frob_control(pi->pardev->port, 0, PARPORT_CONTROL_INIT);
+ break;
+ case PPCMODE_EPP_BYTE:
+ case PPCMODE_EPP_WORD:
+ case PPCMODE_EPP_DWORD:
+ pi->pardev->port->ops->epp_write_data(pi->pardev->port, &data, 1, 0);
+ break;
+ }
+}
+
+static int bpck6_read_regr(struct pi_adapter *pi, int cont, int reg)
+{
+ u8 port = cont ? reg | 8 : reg;
+
+ bpck6_send_cmd(pi, port | ACCESS_PORT | ACCESS_READ);
+ return bpck6_rd_data_byte(pi);
+}
+
+static void bpck6_write_regr(struct pi_adapter *pi, int cont, int reg, int val)
+{
+ u8 port = cont ? reg | 8 : reg;
+
+ bpck6_send_cmd(pi, port | ACCESS_PORT | ACCESS_WRITE);
+ bpck6_wr_data_byte(pi, val);
+}
+
+static void bpck6_wait_for_fifo(struct pi_adapter *pi)
+{
+ int i;
+
+ if (pi->private & fifo_wait) {
+ for (i = 0; i < 20; i++)
+ parport_read_status(pi->pardev->port);
+ }
+}
+
+static void bpck6_write_block(struct pi_adapter *pi, char *buf, int len)
+{
+ u8 this, last;
+
+ bpck6_send_cmd(pi, REG_BLKSIZE | ACCESS_REG | ACCESS_WRITE);
+ bpck6_wr_data_byte(pi, (u8)len);
+ bpck6_wr_data_byte(pi, (u8)(len >> 8));
+ bpck6_wr_data_byte(pi, 0);
+
+ bpck6_send_cmd(pi, CMD_PREFIX_SET | PREFIX_IO16 | PREFIX_BLK);
+ bpck6_send_cmd(pi, ATA_REG_DATA | ACCESS_PORT | ACCESS_WRITE);
+
+ switch (mode_map[pi->mode]) {
+ case PPCMODE_UNI_SW:
+ case PPCMODE_BI_SW:
+ while (len--) {
+ parport_write_data(pi->pardev->port, *buf++);
+ parport_frob_control(pi->pardev->port, 0,
+ PARPORT_CONTROL_INIT);
+ }
+ break;
+ case PPCMODE_UNI_FW:
+ case PPCMODE_BI_FW:
+ bpck6_send_cmd(pi, CMD_PREFIX_SET | PREFIX_FASTWR);
+
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_STROBE);
+
+ last = *buf;
+
+ parport_write_data(pi->pardev->port, last);
+
+ while (len) {
+ this = *buf++;
+ len--;
+
+ if (this == last) {
+ parport_frob_control(pi->pardev->port, 0,
+ PARPORT_CONTROL_INIT);
+ } else {
+ parport_write_data(pi->pardev->port, this);
+ last = this;
+ }
+ }
+
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
+ 0);
+ bpck6_send_cmd(pi, CMD_PREFIX_RESET | PREFIX_FASTWR);
+ break;
+ case PPCMODE_EPP_BYTE:
+ pi->pardev->port->ops->epp_write_data(pi->pardev->port, buf,
+ len, PARPORT_EPP_FAST_8);
+ bpck6_wait_for_fifo(pi);
+ break;
+ case PPCMODE_EPP_WORD:
+ pi->pardev->port->ops->epp_write_data(pi->pardev->port, buf,
+ len, PARPORT_EPP_FAST_16);
+ bpck6_wait_for_fifo(pi);
+ break;
+ case PPCMODE_EPP_DWORD:
+ pi->pardev->port->ops->epp_write_data(pi->pardev->port, buf,
+ len, PARPORT_EPP_FAST_32);
+ bpck6_wait_for_fifo(pi);
+ break;
+ }
+
+ bpck6_send_cmd(pi, CMD_PREFIX_RESET | PREFIX_IO16 | PREFIX_BLK);
+}
+
+static void bpck6_read_block(struct pi_adapter *pi, char *buf, int len)
+{
+ bpck6_send_cmd(pi, REG_BLKSIZE | ACCESS_REG | ACCESS_WRITE);
+ bpck6_wr_data_byte(pi, (u8)len);
+ bpck6_wr_data_byte(pi, (u8)(len >> 8));
+ bpck6_wr_data_byte(pi, 0);
+
+ bpck6_send_cmd(pi, CMD_PREFIX_SET | PREFIX_IO16 | PREFIX_BLK);
+ bpck6_send_cmd(pi, ATA_REG_DATA | ACCESS_PORT | ACCESS_READ);
+
+ switch (mode_map[pi->mode]) {
+ case PPCMODE_UNI_SW:
+ case PPCMODE_UNI_FW:
+ while (len) {
+ u8 d;
+
+ parport_frob_control(pi->pardev->port,
+ PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_INIT); /* DATA STROBE */
+ d = parport_read_status(pi->pardev->port);
+ d = ((d & 0x80) >> 1) | ((d & 0x38) >> 3);
+ parport_frob_control(pi->pardev->port,
+ PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_STROBE);
+ d |= parport_read_status(pi->pardev->port) & 0xB8;
+ *buf++ = d;
+ len--;
+ }
+ break;
+ case PPCMODE_BI_SW:
+ case PPCMODE_BI_FW:
+ parport_data_reverse(pi->pardev->port);
+ while (len) {
+ parport_frob_control(pi->pardev->port,
+ PARPORT_CONTROL_STROBE,
+ PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT);
+ *buf++ = parport_read_data(pi->pardev->port);
+ len--;
+ }
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_STROBE,
+ 0);
+ parport_data_forward(pi->pardev->port);
+ break;
+ case PPCMODE_EPP_BYTE:
+ pi->pardev->port->ops->epp_read_data(pi->pardev->port, buf, len,
+ PARPORT_EPP_FAST_8);
+ break;
+ case PPCMODE_EPP_WORD:
+ pi->pardev->port->ops->epp_read_data(pi->pardev->port, buf, len,
+ PARPORT_EPP_FAST_16);
+ break;
+ case PPCMODE_EPP_DWORD:
+ pi->pardev->port->ops->epp_read_data(pi->pardev->port, buf, len,
+ PARPORT_EPP_FAST_32);
+ break;
+ }
+
+ bpck6_send_cmd(pi, CMD_PREFIX_RESET | PREFIX_IO16 | PREFIX_BLK);
+}
+
+static int bpck6_open(struct pi_adapter *pi)
+{
+ u8 i, j, k;
+
+ pi->saved_r0 = parport_read_data(pi->pardev->port);
+ pi->saved_r2 = parport_read_control(pi->pardev->port) & 0x5F;
+
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_SELECT,
+ PARPORT_CONTROL_SELECT);
+ if (pi->saved_r0 == 'b')
+ parport_write_data(pi->pardev->port, 'x');
+ parport_write_data(pi->pardev->port, 'b');
+ parport_write_data(pi->pardev->port, 'p');
+ parport_write_data(pi->pardev->port, pi->unit);
+ parport_write_data(pi->pardev->port, ~pi->unit);
+
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_SELECT, 0);
+ parport_write_control(pi->pardev->port, PARPORT_CONTROL_INIT);
+
+ i = mode_map[pi->mode] & 0x0C;
+ if (i == 0)
+ i = (mode_map[pi->mode] & 2) | 1;
+ parport_write_data(pi->pardev->port, i);
+
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_SELECT,
+ PARPORT_CONTROL_SELECT);
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_AUTOFD,
+ PARPORT_CONTROL_AUTOFD);
+
+ j = ((i & 0x08) << 4) | ((i & 0x07) << 3);
+ k = parport_read_status(pi->pardev->port) & 0xB8;
+ if (j != k)
+ goto fail;
+
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_AUTOFD, 0);
+ k = (parport_read_status(pi->pardev->port) & 0xB8) ^ 0xB8;
+ if (j != k)
+ goto fail;
+
+ if (i & 4) {
+ /* EPP */
+ parport_frob_control(pi->pardev->port,
+ PARPORT_CONTROL_SELECT | PARPORT_CONTROL_INIT, 0);
+ } else {
+ /* PPC/ECP */
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_SELECT, 0);
+ }
+
+ pi->private = 0;
+
+ bpck6_send_cmd(pi, ACCESS_REG | ACCESS_WRITE | REG_RAMSIZE);
+ bpck6_wr_data_byte(pi, RAMSIZE_128K);
+
+ bpck6_send_cmd(pi, ACCESS_REG | ACCESS_READ | REG_VERSION);
+ if ((bpck6_rd_data_byte(pi) & 0x3F) == 0x0C)
+ pi->private |= fifo_wait;
+
+ return 1;
+
+fail:
+ parport_write_control(pi->pardev->port, pi->saved_r2);
+ parport_write_data(pi->pardev->port, pi->saved_r0);
+
+ return 0;
+}
+
+static void bpck6_deselect(struct pi_adapter *pi)
+{
+ if (mode_map[pi->mode] & 4) {
+ /* EPP */
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_INIT,
+ PARPORT_CONTROL_INIT);
+ } else {
+ /* PPC/ECP */
+ parport_frob_control(pi->pardev->port, PARPORT_CONTROL_SELECT,
+ PARPORT_CONTROL_SELECT);
+ }
+
+ parport_write_data(pi->pardev->port, pi->saved_r0);
+ parport_write_control(pi->pardev->port,
+ pi->saved_r2 | PARPORT_CONTROL_SELECT);
+ parport_write_control(pi->pardev->port, pi->saved_r2);
+}
+
+static void bpck6_wr_extout(struct pi_adapter *pi, u8 regdata)
+{
+ bpck6_send_cmd(pi, REG_VERSION | ACCESS_REG | ACCESS_WRITE);
+ bpck6_wr_data_byte(pi, (u8)((regdata & 0x03) << 6));
+}
+
+static void bpck6_connect(struct pi_adapter *pi)
+{
+ dev_dbg(&pi->dev, "connect\n");
+
+ bpck6_open(pi);
+ bpck6_wr_extout(pi, 0x3);
+}
+
+static void bpck6_disconnect(struct pi_adapter *pi)
+{
+ dev_dbg(&pi->dev, "disconnect\n");
+ bpck6_wr_extout(pi, 0x0);
+ bpck6_deselect(pi);
+}
+
+/* check for 8-bit port */
+static int bpck6_test_port(struct pi_adapter *pi)
+{
+ dev_dbg(&pi->dev, "PARPORT indicates modes=%x for lp=0x%lx\n",
+ pi->pardev->port->modes, pi->pardev->port->base);
+
+ /* look at the parport device to see what modes we can use */
+ if (pi->pardev->port->modes & PARPORT_MODE_EPP)
+ return 5; /* Can do EPP */
+ if (pi->pardev->port->modes & PARPORT_MODE_TRISTATE)
+ return 2;
+ return 1; /* Just flat SPP */
+}
+
+static int bpck6_probe_unit(struct pi_adapter *pi)
+{
+ int out, saved_mode;
+
+ dev_dbg(&pi->dev, "PROBE UNIT %x on port:%x\n", pi->unit, pi->port);
+
+ saved_mode = pi->mode;
+ /*LOWER DOWN TO UNIDIRECTIONAL*/
+ pi->mode = 0;
+
+ out = bpck6_open(pi);
+
+ dev_dbg(&pi->dev, "ppc_open returned %2x\n", out);
+
+ if (out) {
+ bpck6_deselect(pi);
+ dev_dbg(&pi->dev, "leaving probe\n");
+ pi->mode = saved_mode;
+ return 1;
+ }
+
+ dev_dbg(&pi->dev, "Failed open\n");
+ pi->mode = saved_mode;
+
+ return 0;
+}
+
+static void bpck6_log_adapter(struct pi_adapter *pi)
+{
+ char *mode_string[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
+
+ dev_info(&pi->dev,
+ "Micro Solutions BACKPACK Drive unit %d at 0x%x, mode:%d (%s), delay %d\n",
+ pi->unit, pi->port, pi->mode, mode_string[pi->mode], pi->delay);
+}
+
+static struct pi_protocol bpck6 = {
+ .owner = THIS_MODULE,
+ .name = "bpck6",
+ .max_mode = 5,
+ .epp_first = 2, /* 2-5 use epp (need 8 ports) */
+ .max_units = 255,
+ .write_regr = bpck6_write_regr,
+ .read_regr = bpck6_read_regr,
+ .write_block = bpck6_write_block,
+ .read_block = bpck6_read_block,
+ .connect = bpck6_connect,
+ .disconnect = bpck6_disconnect,
+ .test_port = bpck6_test_port,
+ .probe_unit = bpck6_probe_unit,
+ .log_adapter = bpck6_log_adapter,
+};
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Micro Solutions Inc.");
+MODULE_DESCRIPTION("Micro Solutions BACKPACK parallel port IDE adapter "
+ "(version 6 drives) protocol driver");
+module_pata_parport_driver(bpck6);
generated by cgit (git 2.34.1) at 2025-12-25 21:21:24 +0000