[Linux-parport] [PATCH 01/16] pata_parport: add core driver (PARIDE replacement)
Ondrej Zary
linux at zary.sk
Sat Mar 5 12:13:56 PST 2022
Add pata_parport (PARIDE replacement) core libata driver.
Signed-off-by: Ondrej Zary <linux at zary.sk>
---
drivers/ata/Kconfig | 25 +
drivers/ata/Makefile | 2 +
drivers/ata/pata_parport/Kconfig | 10 +
drivers/ata/pata_parport/Makefile | 9 +
drivers/ata/pata_parport/pata_parport.c | 809 ++++++++++++++++++++++++
drivers/ata/pata_parport/pata_parport.h | 110 ++++
6 files changed, 965 insertions(+)
create mode 100644 drivers/ata/pata_parport/Kconfig
create mode 100644 drivers/ata/pata_parport/Makefile
create mode 100644 drivers/ata/pata_parport/pata_parport.c
create mode 100644 drivers/ata/pata_parport/pata_parport.h
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index cb54631fd950..de4548471398 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -1161,6 +1161,31 @@ config PATA_WINBOND_VLB
Support for the Winbond W83759A controller on Vesa Local Bus
systems.
+config PATA_PARPORT
+ tristate "Parallel port IDE device support (PARIDE replacement)"
+ depends on PARPORT_PC
+ help
+ There are many external CD-ROM and disk devices that connect through
+ your computer's parallel port. Most of them are actually IDE devices
+ using a parallel port IDE adapter. This option enables the PATA_PARPORT
+ subsystem which contains drivers for many of these external drives.
+ Read <file:Documentation/admin-guide/blockdev/paride.rst> for more information.
+
+ If you have said Y to the "Parallel-port support" configuration
+ option, you may share a single port between your printer and other
+ parallel port devices. Answer Y to build PATA_PARPORT support into your
+ kernel, or M if you would like to build it as a loadable module. If
+ your parallel port support is in a loadable module, you must build
+ PATA_PARPORT as a module. If you built PATA_PARPORT support into your kernel,
+ you may still build the individual protocol modules as loadable
+ modules. If you build this support as a module, it will be called pata_parport.
+
+ Unlike the old PARIDE, there are no high-level drivers needed.
+ The IDE devices behind parallel port adapters are handled by the
+ ATA layer.
+
+source "drivers/ata/pata_parport/Kconfig"
+
comment "Generic fallback / legacy drivers"
config PATA_ACPI
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index b8aebfb14e82..bd6b5fdc004e 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -114,6 +114,8 @@ obj-$(CONFIG_PATA_SAMSUNG_CF) += pata_samsung_cf.o
obj-$(CONFIG_PATA_PXA) += pata_pxa.o
+obj-$(CONFIG_PATA_PARPORT) += pata_parport/
+
# Should be last but two libata driver
obj-$(CONFIG_PATA_ACPI) += pata_acpi.o
# Should be last but one libata driver
diff --git a/drivers/ata/pata_parport/Kconfig b/drivers/ata/pata_parport/Kconfig
new file mode 100644
index 000000000000..56dc6b25d5fa
--- /dev/null
+++ b/drivers/ata/pata_parport/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# PATA_PARPORT configuration
+#
+# PATA_PARPORT doesn't need PARPORT, but if PARPORT is configured as a module,
+# PATA_PARPORT must also be a module.
+# PATA_PARPORT only supports PC style parports. Tough for USB or other parports...
+
+comment "Parallel IDE protocol modules"
+ depends on PATA_PARPORT
diff --git a/drivers/ata/pata_parport/Makefile b/drivers/ata/pata_parport/Makefile
new file mode 100644
index 000000000000..b105e1cb8dc6
--- /dev/null
+++ b/drivers/ata/pata_parport/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Parallel port IDE device drivers.
+#
+# 7 October 2000, Bartlomiej Zolnierkiewicz <bkz at linux-ide.org>
+# Rewritten to use lists instead of if-statements.
+#
+
+obj-$(CONFIG_PATA_PARPORT) += pata_parport.o
diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c
new file mode 100644
index 000000000000..7f814062cedd
--- /dev/null
+++ b/drivers/ata/pata_parport/pata_parport.c
@@ -0,0 +1,809 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/parport.h>
+#include "pata_parport.h"
+
+#define DRV_NAME "pata_parport"
+
+static DEFINE_IDR(parport_list);
+static DEFINE_IDR(protocols);
+static DEFINE_IDA(pata_parport_bus_dev_ids);
+static DEFINE_MUTEX(pi_mutex);
+
+static bool probe = 1;
+module_param(probe, bool, 0644);
+MODULE_PARM_DESC(probe, "Enable automatic device probing (0=off, 1=on [default])");
+
+static bool verbose;
+module_param(verbose, bool, 0644);
+MODULE_PARM_DESC(verbose, "Enable verbose messages (0=off [default], 1=on)");
+
+#define DISCONNECT_TIMEOUT (HZ / 10)
+
+static void pi_connect(struct pi_adapter *pi)
+{
+ del_timer_sync(&pi->timer);
+ if (pi->claimed)
+ return;
+ pi->claimed = 1;
+ parport_claim_or_block(pi->pardev);
+ pi->proto->connect(pi);
+}
+
+static void pi_disconnect_later(struct pi_adapter *pi)
+{
+ mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT);
+}
+
+static void pi_disconnect_timer(struct timer_list *t)
+{
+ struct pi_adapter *pi = from_timer(pi, t, timer);
+
+ if (!pi->claimed)
+ return;
+ pi->proto->disconnect(pi);
+ parport_release(pi->pardev);
+ pi->claimed = 0;
+}
+
+/* functions taken from libata-sff.c and converted from direct port I/O */
+static unsigned int pata_parport_devchk(struct ata_port *ap, unsigned int device)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+ u8 nsect, lbal;
+
+ ap->ops->sff_dev_select(ap, device);
+
+ pi_connect(pi);
+ pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0x55);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa);
+
+ pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 0xaa);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0x55);
+
+ pi->proto->write_regr(pi, 0, ATA_REG_NSECT, 055);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAL, 0xaa);
+
+ nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
+ lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
+ pi_disconnect_later(pi);
+
+ if ((nsect == 0x55) && (lbal == 0xaa))
+ return 1; /* we found a device */
+
+ return 0; /* nothing found */
+}
+
+static int pata_parport_bus_softreset(struct ata_port *ap, unsigned int devmask,
+ unsigned long deadline)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi_connect(pi);
+ /* software reset. causes dev0 to be selected */
+ pi->proto->write_regr(pi, 1, 6, ap->ctl);
+ udelay(20); /* FIXME: flush */
+ pi->proto->write_regr(pi, 1, 6, ap->ctl | ATA_SRST);
+ udelay(20); /* FIXME: flush */
+ pi->proto->write_regr(pi, 1, 6, ap->ctl);
+ ap->last_ctl = ap->ctl;
+ pi_disconnect_later(pi);
+
+ /* wait the port to become ready */
+ return ata_sff_wait_after_reset(&ap->link, devmask, deadline);
+}
+
+static int pata_parport_softreset(struct ata_link *link, unsigned int *classes,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
+ unsigned int devmask = 0;
+ int rc;
+ u8 err;
+
+ /* determine if device 0/1 are present */
+ if (pata_parport_devchk(ap, 0))
+ devmask |= (1 << 0);
+ if (slave_possible && pata_parport_devchk(ap, 1))
+ devmask |= (1 << 1);
+
+ /* select device 0 again */
+ ap->ops->sff_dev_select(ap, 0);
+
+ /* issue bus reset */
+ rc = pata_parport_bus_softreset(ap, devmask, deadline);
+ /* if link is occupied, -ENODEV too is an error */
+ if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
+ ata_link_err(link, "SRST failed (errno=%d)\n", rc);
+ return rc;
+ }
+
+ /* determine by signature whether we have ATA or ATAPI devices */
+ classes[0] = ata_sff_dev_classify(&link->device[0],
+ devmask & (1 << 0), &err);
+ if (slave_possible && err != 0x81)
+ classes[1] = ata_sff_dev_classify(&link->device[1],
+ devmask & (1 << 1), &err);
+
+ return 0;
+}
+
+static u8 pata_parport_check_status(struct ata_port *ap)
+{
+ u8 status;
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi_connect(pi);
+ status = pi->proto->read_regr(pi, 0, ATA_REG_STATUS);
+ pi_disconnect_later(pi);
+
+ return status;
+}
+
+static u8 pata_parport_check_altstatus(struct ata_port *ap)
+{
+ u8 altstatus;
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi_connect(pi);
+ altstatus = pi->proto->read_regr(pi, 1, 6);
+ pi_disconnect_later(pi);
+
+ return altstatus;
+}
+
+static void pata_parport_dev_select(struct ata_port *ap, unsigned int device)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+ u8 tmp;
+
+ pi_connect(pi);
+ if (device == 0)
+ tmp = ATA_DEVICE_OBS;
+ else
+ tmp = ATA_DEVICE_OBS | ATA_DEV1;
+
+ pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tmp);
+ pi_disconnect_later(pi);
+ ata_sff_pause(ap); /* needed; also flushes, for mmio */
+}
+
+static void pata_parport_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+ unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+ pi_connect(pi);
+ if (tf->ctl != ap->last_ctl) {
+ pi->proto->write_regr(pi, 1, 6, tf->ctl);
+ ap->last_ctl = tf->ctl;
+ ata_wait_idle(ap);
+ }
+
+ if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+ pi->proto->write_regr(pi, 0, ATA_REG_FEATURE, tf->hob_feature);
+ pi->proto->write_regr(pi, 0, ATA_REG_NSECT, tf->hob_nsect);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAL, tf->hob_lbal);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAM, tf->hob_lbam);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAH, tf->hob_lbah);
+ }
+
+ if (is_addr) {
+ pi->proto->write_regr(pi, 0, ATA_REG_FEATURE, tf->feature);
+ pi->proto->write_regr(pi, 0, ATA_REG_NSECT, tf->nsect);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAL, tf->lbal);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAM, tf->lbam);
+ pi->proto->write_regr(pi, 0, ATA_REG_LBAH, tf->lbah);
+ }
+
+ if (tf->flags & ATA_TFLAG_DEVICE)
+ pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tf->device);
+
+ ata_wait_idle(ap);
+ pi_disconnect_later(pi);
+}
+
+static void pata_parport_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi_connect(pi);
+ tf->command = pi->proto->read_regr(pi, 0, ATA_REG_STATUS);
+ tf->feature = pi->proto->read_regr(pi, 0, ATA_REG_ERR);
+ tf->nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
+ tf->lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
+ tf->lbam = pi->proto->read_regr(pi, 0, ATA_REG_LBAM);
+ tf->lbah = pi->proto->read_regr(pi, 0, ATA_REG_LBAH);
+ tf->device = pi->proto->read_regr(pi, 0, ATA_REG_DEVICE);
+
+ if (tf->flags & ATA_TFLAG_LBA48) {
+ pi->proto->write_regr(pi, 1, 6, tf->ctl | ATA_HOB);
+ tf->hob_feature = pi->proto->read_regr(pi, 0, ATA_REG_ERR);
+ tf->hob_nsect = pi->proto->read_regr(pi, 0, ATA_REG_NSECT);
+ tf->hob_lbal = pi->proto->read_regr(pi, 0, ATA_REG_LBAL);
+ tf->hob_lbam = pi->proto->read_regr(pi, 0, ATA_REG_LBAM);
+ tf->hob_lbah = pi->proto->read_regr(pi, 0, ATA_REG_LBAH);
+ pi->proto->write_regr(pi, 1, 6, tf->ctl);
+ ap->last_ctl = tf->ctl;
+ }
+ pi_disconnect_later(pi);
+}
+
+static void pata_parport_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi_connect(pi);
+ pi->proto->write_regr(pi, 0, ATA_REG_CMD, tf->command);
+ ata_sff_pause(ap);
+ pi_disconnect_later(pi);
+}
+
+static unsigned int pata_parport_data_xfer(struct ata_queued_cmd *qc, unsigned char *buf,
+ unsigned int buflen, int rw)
+{
+ struct ata_port *ap = qc->dev->link->ap;
+ struct pi_adapter *pi = ap->host->private_data;
+
+ pi_connect(pi);
+ if (rw == READ)
+ pi->proto->read_block(pi, buf, buflen);
+ else
+ pi->proto->write_block(pi, buf, buflen);
+ pi_disconnect_later(pi);
+
+ return buflen;
+}
+
+static void pata_parport_drain_fifo(struct ata_queued_cmd *qc)
+{
+ int count;
+ struct ata_port *ap;
+ struct pi_adapter *pi;
+ char junk[2];
+
+ /* We only need to flush incoming data when a command was running */
+ if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE)
+ return;
+
+ ap = qc->ap;
+ pi = ap->host->private_data;
+ /* Drain up to 64K of data before we give up this recovery method */
+ for (count = 0; (ap->ops->sff_check_status(ap) & ATA_DRQ)
+ && count < 65536; count += 2) {
+ pi_connect(pi);
+ pi->proto->read_block(pi, junk, 2);
+ pi_disconnect_later(pi);
+ }
+
+ if (count)
+ ata_port_dbg(ap, "drained %d bytes to clear DRQ\n", count);
+}
+
+static void pata_parport_lost_interrupt(struct ata_port *ap)
+{
+ u8 status;
+ struct ata_queued_cmd *qc;
+
+ /* Only one outstanding command per SFF channel */
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
+ /* We cannot lose an interrupt on a non-existent or polled command */
+ if (!qc || qc->tf.flags & ATA_TFLAG_POLLING)
+ return;
+ /* See if the controller thinks it is still busy - if so the command
+ isn't a lost IRQ but is still in progress */
+ status = pata_parport_check_altstatus(ap);
+ if (status & ATA_BUSY)
+ return;
+
+ /* There was a command running, we are no longer busy and we have
+ no interrupt. */
+ ata_port_warn(ap, "lost interrupt (Status 0x%x)\n", status);
+ /* Run the host interrupt logic as if the interrupt had not been lost */
+ ata_sff_port_intr(ap, qc);
+}
+
+static struct ata_port_operations pata_parport_port_ops = {
+ .qc_prep = ata_noop_qc_prep,
+ .qc_issue = ata_sff_qc_issue,
+ .qc_fill_rtf = ata_sff_qc_fill_rtf,
+
+ .freeze = ata_sff_freeze,
+ .thaw = ata_sff_thaw,
+ .prereset = ata_sff_prereset,
+ .softreset = pata_parport_softreset,
+ .postreset = ata_sff_postreset,
+ .error_handler = ata_sff_error_handler,
+ .sched_eh = ata_std_sched_eh,
+ .end_eh = ata_std_end_eh,
+
+ .sff_dev_select = pata_parport_dev_select,
+ .sff_check_status = pata_parport_check_status,
+ .sff_check_altstatus = pata_parport_check_altstatus,
+ .sff_tf_load = pata_parport_tf_load,
+ .sff_tf_read = pata_parport_tf_read,
+ .sff_exec_command = pata_parport_exec_command,
+ .sff_data_xfer = pata_parport_data_xfer,
+ .sff_drain_fifo = pata_parport_drain_fifo,
+
+ .lost_interrupt = pata_parport_lost_interrupt,
+};
+
+static const struct ata_port_info pata_parport_port_info = {
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_POLLING,
+ .pio_mask = ATA_PIO0,
+ /* No DMA */
+ .port_ops = &pata_parport_port_ops,
+};
+
+void pi_release(struct pi_adapter *pi)
+{
+ parport_unregister_device(pi->pardev);
+ if (pi->proto->release_proto)
+ pi->proto->release_proto(pi);
+ module_put(pi->proto->owner);
+}
+
+static int default_test_proto(struct pi_adapter *pi, char *scratch)
+{
+ int j, k;
+ int e[2] = { 0, 0 };
+
+ pi->proto->connect(pi);
+
+ for (j = 0; j < 2; j++) {
+ pi->proto->write_regr(pi, 0, 6, 0xa0 + j * 0x10);
+ for (k = 0; k < 256; k++) {
+ pi->proto->write_regr(pi, 0, 2, k ^ 0xaa);
+ pi->proto->write_regr(pi, 0, 3, k ^ 0x55);
+ if (pi->proto->read_regr(pi, 0, 2) != (k ^ 0xaa))
+ e[j]++;
+ }
+ }
+ pi->proto->disconnect(pi);
+
+ if (verbose)
+ dev_info(&pi->dev, "%s: port 0x%x, mode %d, test=(%d,%d)\n",
+ pi->proto->name, pi->port,
+ pi->mode, e[0], e[1]);
+
+ return (e[0] && e[1]); /* not here if both > 0 */
+}
+
+static int pi_test_proto(struct pi_adapter *pi, char *scratch)
+{
+ int res;
+
+ parport_claim_or_block(pi->pardev);
+ if (pi->proto->test_proto)
+ res = pi->proto->test_proto(pi, scratch, verbose);
+ else
+ res = default_test_proto(pi, scratch);
+ parport_release(pi->pardev);
+
+ return res;
+}
+
+static int pi_probe_mode(struct pi_adapter *pi, int max, char *scratch)
+{
+ int best, range;
+
+ if (pi->mode != -1) {
+ if (pi->mode >= max)
+ return 0;
+ range = 3;
+ if (pi->mode >= pi->proto->epp_first)
+ range = 8;
+ if ((range == 8) && (pi->port % 8))
+ return 0;
+ return (!pi_test_proto(pi, scratch));
+ }
+ best = -1;
+ for (pi->mode = 0; pi->mode < max; pi->mode++) {
+ range = 3;
+ if (pi->mode >= pi->proto->epp_first)
+ range = 8;
+ if ((range == 8) && (pi->port % 8))
+ break;
+ if (!pi_test_proto(pi, scratch))
+ best = pi->mode;
+ }
+ pi->mode = best;
+ return (best > -1);
+}
+
+
+static int pi_probe_unit(struct pi_adapter *pi, int unit, char *scratch)
+{
+ int max, s, e;
+
+ s = unit;
+ e = s + 1;
+
+ if (s == -1) {
+ s = 0;
+ e = pi->proto->max_units;
+ }
+
+ if (pi->proto->test_port) {
+ parport_claim_or_block(pi->pardev);
+ max = pi->proto->test_port(pi);
+ parport_release(pi->pardev);
+ } else
+ max = pi->proto->max_mode;
+
+ if (pi->proto->probe_unit) {
+ parport_claim_or_block(pi->pardev);
+ for (pi->unit = s; pi->unit < e; pi->unit++)
+ if (pi->proto->probe_unit(pi)) {
+ parport_release(pi->pardev);
+ if (pi_probe_mode(pi, max, scratch))
+ return 1;
+ return 0;
+ }
+ parport_release(pi->pardev);
+ return 0;
+ }
+
+ if (!pi_probe_mode(pi, max, scratch))
+ return 0;
+ return 1;
+}
+
+static void pata_parport_dev_release(struct device *dev)
+{
+ struct pi_adapter *pi = container_of(dev, struct pi_adapter, dev);
+
+ kfree(pi);
+}
+
+void pata_parport_bus_release(struct device *dev)
+{
+ /* nothing to do here but required to avoid warning on device removal */
+}
+
+static struct bus_type pata_parport_bus_type = {
+ .name = DRV_NAME,
+};
+
+static struct device pata_parport_bus = {
+ .init_name = DRV_NAME,
+ .release = pata_parport_bus_release,
+};
+
+struct pi_adapter *pi_init_one(struct parport *parport, struct pi_protocol *pr,
+ int mode, int unit, int delay)
+{
+ struct pardev_cb par_cb = { };
+ char scratch[512];
+ const struct ata_port_info *ppi[] = { &pata_parport_port_info };
+ struct ata_host *host;
+ struct pi_adapter *pi = kzalloc(sizeof(struct pi_adapter), GFP_KERNEL);
+
+ if (!pi)
+ return NULL;
+
+ /* set up pi->dev before pi_probe_unit() so it can use dev_printk() */
+ pi->dev.parent = &pata_parport_bus;
+ pi->dev.bus = &pata_parport_bus_type;
+ pi->dev.driver = &pr->driver;
+ pi->dev.release = pata_parport_dev_release;
+ pi->dev.id = ida_alloc(&pata_parport_bus_dev_ids, GFP_KERNEL);
+ if (pi->dev.id < 0)
+ return NULL; /* pata_parport_dev_release will do kfree(pi) */
+ dev_set_name(&pi->dev, "pata_parport.%u", pi->dev.id);
+ if (device_register(&pi->dev)) {
+ put_device(&pi->dev);
+ goto out_ida_free;
+ }
+
+ pi->proto = pr;
+
+ /* still racy */
+ if (!try_module_get(pi->proto->owner))
+ goto out_unreg_dev;
+ if (pi->proto->init_proto && pi->proto->init_proto(pi) < 0)
+ goto out_module_put;
+
+ pi->delay = (delay == -1) ? pi->proto->default_delay : delay;
+ pi->mode = mode;
+ pi->port = parport->base;
+
+ par_cb.private = pi;
+ pi->pardev = parport_register_dev_model(parport, dev_name(&pi->dev),
+ &par_cb, pi->dev.id);
+ if (!pi->pardev)
+ goto out_module_put;
+
+ if (!pi_probe_unit(pi, unit, scratch)) {
+ dev_info(&pi->dev, "Adapter not found\n");
+ goto out_unreg_parport;
+ }
+
+ pi->proto->log_adapter(pi, scratch, verbose);
+
+ host = ata_host_alloc_pinfo(&pi->dev, ppi, 1);
+ if (!host)
+ goto out_unreg_parport;
+ dev_set_drvdata(&pi->dev, host);
+ host->private_data = pi;
+
+ ata_port_desc(host->ports[0], "port %s", pi->pardev->port->name);
+ ata_port_desc(host->ports[0], "protocol %s", pi->proto->name);
+
+ timer_setup(&pi->timer, pi_disconnect_timer, 0);
+
+ if (ata_host_activate(host, 0, NULL, 0, &pi->proto->sht))
+ goto out_unreg_parport;
+
+ return pi;
+
+out_unreg_parport:
+ parport_unregister_device(pi->pardev);
+ if (pi->proto->release_proto)
+ pi->proto->release_proto(pi);
+out_module_put:
+ module_put(pi->proto->owner);
+out_unreg_dev:
+ device_unregister(&pi->dev);
+out_ida_free:
+ ida_free(&pata_parport_bus_dev_ids, pi->dev.id);
+ return NULL;
+}
+
+int pata_parport_register_driver(struct pi_protocol *pr)
+{
+ int error;
+ struct parport *parport;
+ int port_num;
+
+ pr->driver.bus = &pata_parport_bus_type;
+ pr->driver.name = pr->name;
+ error = driver_register(&pr->driver);
+ if (error)
+ return error;
+
+ mutex_lock(&pi_mutex);
+ error = idr_alloc(&protocols, pr, 0, 0, GFP_KERNEL);
+ if (error < 0) {
+ driver_unregister(&pr->driver);
+ mutex_unlock(&pi_mutex);
+ return error;
+ }
+
+ pr_info("pata_parport: protocol %s registered\n", pr->name);
+
+ if (probe) /* probe all parports using this protocol */
+ idr_for_each_entry(&parport_list, parport, port_num)
+ pi_init_one(parport, pr, -1, 0, -1);
+ mutex_unlock(&pi_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(pata_parport_register_driver);
+
+void pata_parport_unregister_driver(struct pi_protocol *pr)
+{
+ struct pi_protocol *pr_iter;
+ int id = -1;
+
+ mutex_lock(&pi_mutex);
+ idr_for_each_entry(&protocols, pr_iter, id)
+ if (pr_iter == pr)
+ break;
+ idr_remove(&protocols, id);
+ mutex_unlock(&pi_mutex);
+ pr_info("pata_parport: protocol %s removed\n", pr->name);
+ driver_unregister(&pr->driver);
+}
+EXPORT_SYMBOL(pata_parport_unregister_driver);
+
+static ssize_t new_device_store(struct bus_type *bus, const char *buf, size_t count)
+{
+ char port[12] = "auto";
+ char protocol[8] = "auto";
+ int mode = -1, unit = -1, delay = -1;
+ struct pi_protocol *pr, *pr_wanted;
+ struct device_driver *drv;
+ struct parport *parport;
+ int port_num, port_wanted, pr_num;
+ bool ok = false;
+
+ if (sscanf(buf, "%11s %7s %d %d %d",
+ port, protocol, &mode, &unit, &delay) < 1)
+ return -EINVAL;
+
+ if (sscanf(port, "parport%u", &port_wanted) < 1) {
+ if (!strcmp(port, "auto"))
+ port_wanted = -1;
+ else {
+ pr_err("invalid port name %s\n", port);
+ return -EINVAL;
+ }
+ }
+
+ drv = driver_find(protocol, &pata_parport_bus_type);
+ if (!drv) {
+ if (!strcmp(protocol, "auto"))
+ pr_wanted = NULL;
+ else {
+ pr_err("protocol %s not found\n", protocol);
+ return -EINVAL;
+ }
+ } else
+ pr_wanted = container_of(drv, struct pi_protocol, driver);
+
+ mutex_lock(&pi_mutex);
+ /* walk all parports */
+ idr_for_each_entry(&parport_list, parport, port_num) {
+ if (port_num == port_wanted || port_wanted == -1) {
+ parport = parport_find_number(port_num);
+ if (!parport) {
+ pr_err("no such port %s\n", port);
+ mutex_unlock(&pi_mutex);
+ return -ENODEV;
+ }
+ /* walk all protocols */
+ idr_for_each_entry(&protocols, pr, pr_num)
+ if (pr == pr_wanted || !pr_wanted)
+ if (pi_init_one(parport, pr, mode, unit,
+ delay))
+ ok = true;
+ parport_put_port(parport);
+ }
+ }
+ mutex_unlock(&pi_mutex);
+ if (!ok)
+ return -ENODEV;
+
+ return count;
+}
+static BUS_ATTR_WO(new_device);
+
+static void pi_remove_one(struct device *dev)
+{
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct pi_adapter *pi = host->private_data;
+
+ ata_host_detach(host);
+ del_timer_sync(&pi->timer);
+ pi_release(pi);
+ device_unregister(dev);
+ ida_free(&pata_parport_bus_dev_ids, dev->id);
+ /* pata_parport_dev_release will do kfree(pi) */
+}
+
+static ssize_t delete_device_store(struct bus_type *bus, const char *buf, size_t count)
+{
+ struct device *dev;
+ char device_name[32];
+ int fields;
+
+ fields = sscanf(buf, "%31s", device_name);
+ if (fields < 1)
+ return -EINVAL;
+
+ mutex_lock(&pi_mutex);
+ dev = bus_find_device_by_name(bus, NULL, device_name);
+ if (!dev) {
+ mutex_unlock(&pi_mutex);
+ return -ENODEV;
+ }
+
+ pi_remove_one(dev);
+ mutex_unlock(&pi_mutex);
+
+ return count;
+}
+static BUS_ATTR_WO(delete_device);
+
+static void pata_parport_attach(struct parport *port)
+{
+ struct pi_protocol *pr;
+ int pr_num, id;
+
+ mutex_lock(&pi_mutex);
+ id = idr_alloc(&parport_list, port, port->number, port->number, GFP_KERNEL);
+ if (id < 0) {
+ mutex_unlock(&pi_mutex);
+ return;
+ }
+
+ if (probe) /* probe this port using all protocols */
+ idr_for_each_entry(&protocols, pr, pr_num)
+ pi_init_one(port, pr, -1, 0, -1);
+ mutex_unlock(&pi_mutex);
+}
+
+static int pi_remove_port(struct device *dev, void *p)
+{
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct pi_adapter *pi = host->private_data;
+
+ if (pi->pardev->port == p)
+ pi_remove_one(dev);
+
+ return 0;
+}
+
+static void pata_parport_detach(struct parport *port)
+{
+ mutex_lock(&pi_mutex);
+ bus_for_each_dev(&pata_parport_bus_type, NULL, port, pi_remove_port);
+ idr_remove(&parport_list, port->number);
+ mutex_unlock(&pi_mutex);
+}
+
+static struct parport_driver pata_parport_driver = {
+ .name = DRV_NAME,
+ .match_port = pata_parport_attach,
+ .detach = pata_parport_detach,
+ .devmodel = true,
+};
+
+static __init int pata_parport_init(void)
+{
+ int error;
+
+ error = bus_register(&pata_parport_bus_type);
+ if (error) {
+ pr_err("failed to register pata_parport bus, error: %d\n", error);
+ return error;
+ }
+
+ error = device_register(&pata_parport_bus);
+ if (error) {
+ pr_err("failed to register pata_parport bus, error: %d\n", error);
+ return error;
+ goto out_unregister_bus;
+ }
+
+ error = bus_create_file(&pata_parport_bus_type, &bus_attr_new_device);
+ if (error) {
+ pr_err("unable to create sysfs file, error: %d\n", error);
+ goto out_unregister_dev;
+ }
+
+ error = bus_create_file(&pata_parport_bus_type, &bus_attr_delete_device);
+ if (error) {
+ pr_err("unable to create sysfs file, error: %d\n", error);
+ goto out_remove_new;
+ }
+
+ error = parport_register_driver(&pata_parport_driver);
+ if (error) {
+ pr_err("unable to register parport driver, error: %d\n", error);
+ goto out_remove_del;
+ }
+
+ return 0;
+
+out_remove_del:
+ bus_remove_file(&pata_parport_bus_type, &bus_attr_delete_device);
+out_remove_new:
+ bus_remove_file(&pata_parport_bus_type, &bus_attr_new_device);
+out_unregister_dev:
+ device_unregister(&pata_parport_bus);
+out_unregister_bus:
+ bus_unregister(&pata_parport_bus_type);
+ return error;
+}
+
+static __exit void pata_parport_exit(void)
+{
+ parport_unregister_driver(&pata_parport_driver);
+ bus_remove_file(&pata_parport_bus_type, &bus_attr_new_device);
+ bus_remove_file(&pata_parport_bus_type, &bus_attr_delete_device);
+ device_unregister(&pata_parport_bus);
+ bus_unregister(&pata_parport_bus_type);
+}
+
+MODULE_AUTHOR("Ondrej Zary");
+MODULE_DESCRIPTION("driver for parallel port ATA adapters");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("paride");
+
+module_init(pata_parport_init);
+module_exit(pata_parport_exit);
diff --git a/drivers/ata/pata_parport/pata_parport.h b/drivers/ata/pata_parport/pata_parport.h
new file mode 100644
index 000000000000..c4201b809b20
--- /dev/null
+++ b/drivers/ata/pata_parport/pata_parport.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * paride.h (c) 1997-8 Grant R. Guenther <grant at torque.net>
+ * Under the terms of the GPL.
+ *
+ * This file defines the interface for adapter chip drivers.
+ */
+
+#include <linux/libata.h>
+
+struct pi_adapter {
+ struct device dev;
+ struct pi_protocol *proto; /* adapter protocol */
+ int port; /* base address of parallel port */
+ int mode; /* transfer mode in use */
+ int delay; /* adapter delay setting */
+ int unit; /* unit number for chained adapters */
+ int saved_r0; /* saved port state */
+ int saved_r2; /* saved port state */
+ unsigned long private; /* for protocol module */
+ struct pardevice *pardev; /* pointer to pardevice */
+ int claimed; /* parport has already been claimed */
+ struct timer_list timer; /* disconnect timer */
+};
+
+/* registers are addressed as (cont,regr)
+ * cont: 0 for command register file, 1 for control register(s)
+ * regr: 0-7 for register number.
+ */
+
+/* macros and functions exported to the protocol modules */
+#define delay_p (pi->delay ? udelay(pi->delay) : (void)0)
+#define out_p(offs, byte) do { outb(byte, pi->port + offs); delay_p; } while (0)
+#define in_p(offs) (delay_p, inb(pi->port + offs))
+
+#define w0(byte) out_p(0, byte)
+#define r0() (in_p(0) & 0xff)
+#define w1(byte) out_p(1, byte)
+#define r1() (in_p(1) & 0xff)
+#define w2(byte) out_p(2, byte)
+#define r2() (in_p(2) & 0xff)
+#define w3(byte) out_p(3, byte)
+#define w4(byte) out_p(4, byte)
+#define r4() (in_p(4) & 0xff)
+#define w4w(data) do { outw(data, pi->port + 4); delay_p; } while (0)
+#define w4l(data) do { outl(data, pi->port + 4); delay_p; } while (0)
+#define r4w() (delay_p, inw(pi->port + 4) & 0xffff)
+#define r4l() (delay_p, inl(pi->port + 4) & 0xffffffff)
+
+static inline u16 pi_swab16(char *b, int k)
+{
+ union { u16 u; char t[2]; } r;
+
+ r.t[0] = b[2 * k + 1]; r.t[1] = b[2 * k];
+ return r.u;
+}
+
+static inline u32 pi_swab32(char *b, int k)
+{
+ union { u32 u; char f[4]; } r;
+
+ r.f[0] = b[4 * k + 1]; r.f[1] = b[4 * k];
+ r.f[2] = b[4 * k + 3]; r.f[3] = b[4 * k + 2];
+ return r.u;
+}
+
+struct pi_protocol {
+ char name[8]; /* name for this protocol */
+
+ int max_mode; /* max mode number */
+ int epp_first; /* modes >= this use 8 ports */
+
+ int default_delay; /* delay parameter if not specified */
+ int max_units; /* max chained units probed for */
+
+ void (*write_regr)(struct pi_adapter *pi, int cont, int regr, int val);
+ int (*read_regr)(struct pi_adapter *pi, int cont, int regr);
+ void (*write_block)(struct pi_adapter *pi, char *buf, int count);
+ void (*read_block)(struct pi_adapter *pi, char *buf, int count);
+
+ void (*connect)(struct pi_adapter *pi);
+ void (*disconnect)(struct pi_adapter *pi);
+
+ int (*test_port)(struct pi_adapter *pi);
+ int (*probe_unit)(struct pi_adapter *pi);
+ int (*test_proto)(struct pi_adapter *pi, char *scratch, int verbose);
+ void (*log_adapter)(struct pi_adapter *pi, char *scratch, int verbose);
+
+ int (*init_proto)(struct pi_adapter *pi);
+ void (*release_proto)(struct pi_adapter *pi);
+ struct module *owner;
+ struct device_driver driver;
+ struct scsi_host_template sht;
+};
+
+#define PATA_PARPORT_SHT ATA_PIO_SHT
+
+extern int pata_parport_register_driver(struct pi_protocol *pr);
+extern void pata_parport_unregister_driver(struct pi_protocol *pr);
+
+/**
+ * module_pata_parport_driver() - Helper macro for registering a pata_parport driver
+ * @__pi_protocol: pi_protocol struct
+ *
+ * Helper macro for pata_parport drivers which do not do anything special in module
+ * init/exit. This eliminates a lot of boilerplate. Each module may only
+ * use this macro once, and calling it replaces module_init() and module_exit()
+ */
+#define module_pata_parport_driver(__pi_protocol) \
+ module_driver(__pi_protocol, pata_parport_register_driver, pata_parport_unregister_driver)
--
Ondrej Zary
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