The pata_parport is a libata-based replacement of the old PARIDE subsystem - driver for parallel port IDE devices. It uses the original paride low-level protocol drivers but does not need the high-level drivers (pd, pcd, pf, pt, pg). The IDE devices behind parallel port adapters are handled by the ATA layer. This will allow paride and its high-level drivers to be removed. paride and pata_parport are mutually exclusive because the compiled protocol drivers are incompatible. Tested with Imation SuperDisk LS-120 and HP C4381A (both use EPAT chip). Note: EPP-32 mode is buggy in EPAT - and also in all other protocol drivers - they don't handle non-multiple-of-4 block transfers correctly. This causes problems with LS-120 drive. There is also another bug in EPAT: EPP modes don't work unless a 4-bit or 8-bit mode is used first (probably some initialization missing?). Once the device is initialized, EPP works until power cycle. So after device power on, you have to: echo "parport0 epat 0" >/sys/bus/pata_parport/new_device echo pata_parport.0 >/sys/bus/pata_parport/delete_device echo "parport0 epat 4" >/sys/bus/pata_parport/new_device (autoprobe will initialize correctly as it tries the slowest modes first but you'll get the broken EPP-32 mode) Signed-off-by: Ondrej Zary <linux@xxxxxxx> --- Documentation/admin-guide/blockdev/paride.rst | 52 ++ drivers/Makefile | 2 +- drivers/ata/Kconfig | 14 + drivers/ata/Makefile | 2 + drivers/ata/pata_parport.c | 819 ++++++++++++++++++ drivers/block/paride/Kconfig | 32 +- drivers/block/paride/paride.h | 13 + include/linux/pata_parport.h | 108 +++ 8 files changed, 1025 insertions(+), 17 deletions(-) create mode 100644 drivers/ata/pata_parport.c create mode 100644 include/linux/pata_parport.h diff --git a/Documentation/admin-guide/blockdev/paride.rst b/Documentation/admin-guide/blockdev/paride.rst index e1ce90af602a..e431a1ef41eb 100644 --- a/Documentation/admin-guide/blockdev/paride.rst +++ b/Documentation/admin-guide/blockdev/paride.rst @@ -2,6 +2,9 @@ Linux and parallel port IDE devices =================================== +Most of this document describes the old paride driver. For the new libata +pata_parport drivrer, jump to the section 4 at the end. + PARIDE v1.03 (c) 1997-8 Grant Guenther <grant@xxxxxxxxxx> 1. Introduction @@ -437,3 +440,52 @@ You might also find some useful information on the linux-parport web pages (although they are not always up to date) at http://web.archive.org/web/%2E/http://www.torque.net/parport/ + +4. pata_parport driver +====================== +pata_parport is a libata-based driver that uses the same low-level protocol +drivers as PARIDE but there are no high-level drivers (pd, pcd, pf, pt, pg). +The IDE devices behind parallel port adapters are handled by the ATA layer. + +The device creation is also changed - no protocol numbers or parport I/O +addresses are used. + +All parports and all protocol drivers are probed automatically unless probe=0 +parameter is used. So just "modprobe epat" is enough for a Imation SuperDisk +drive to work. + +Manual device creation:: + + # echo "port protocol mode unit delay" >/sys/bus/pata_parport/new_device + +where: + + ======== ================================================ + port parport name (or "auto" for all parports) + protocol protocol name (or "auto" for all protocols) + mode mode number (protocol-specific) or -1 for probe + unit unit number (see the paride documentation above) + delay I/O delay (see the paride documentation above) + ======== ================================================ + +If you omit the parameters from the end, defaults will be used, e.g.: + +Probe all parports with all protocols:: + + # echo auto >/sys/bus/pata_parport/new_device + +Probe parport0 using protocol epat and mode 4 (EPP-16):: + + # echo "parport0 epat 4" >/sys/bus/pata_parport/new_device + +Probe parport0 using all protocols:: + + # echo "parport0 auto" >/sys/bus/pata_parport/new_device + +Probe all parports using protoocol epat:: + + # echo "auto epat" >/sys/bus/pata_parport/new_device + +Deleting devices:: + + # echo pata_parport.0 >/sys/bus/pata_parport/delete_device diff --git a/drivers/Makefile b/drivers/Makefile index a110338c860c..8ec515f3614e 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -98,7 +98,7 @@ obj-$(CONFIG_DIO) += dio/ obj-$(CONFIG_SBUS) += sbus/ obj-$(CONFIG_ZORRO) += zorro/ obj-$(CONFIG_ATA_OVER_ETH) += block/aoe/ -obj-$(CONFIG_PARIDE) += block/paride/ +obj-y += block/paride/ obj-$(CONFIG_TC) += tc/ obj-$(CONFIG_USB_PHY) += usb/ obj-$(CONFIG_USB) += usb/ diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index e5641e6c52ee..ccbf6114fd53 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -1161,6 +1161,20 @@ config PATA_WINBOND_VLB Support for the Winbond W83759A controller on Vesa Local Bus systems. +config PATA_PARPORT + tristate "Parallel port IDE device support" + depends on PARPORT_PC && PARIDE=n + 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. + + Use the old PARIDE protocol modules. + comment "Generic fallback / legacy drivers" config PATA_ACPI diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile index b8aebfb14e82..77145834a585 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-$(CONFIG_PATA_PARPORT) += pata_parport.o + # Should be last but two libata driver obj-$(CONFIG_PATA_ACPI) += pata_acpi.o # Should be last but one libata driver diff --git a/drivers/ata/pata_parport.c b/drivers/ata/pata_parport.c new file mode 100644 index 000000000000..783764626a27 --- /dev/null +++ b/drivers/ata/pata_parport.c @@ -0,0 +1,819 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2022 Ondrej Zary + * based on paride.c by Grant R. Guenther <grant@xxxxxxxxxx> + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/parport.h> +#include <linux/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 = true; +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) { + pi->claimed = true; + parport_claim_or_block(pi->pardev); + pi->proto->connect(pi); + } +} + +static void pi_disconnect_timer(struct timer_list *t) +{ + struct pi_adapter *pi = from_timer(pi, t, timer); + + if (pi->claimed) { + pi->proto->disconnect(pi); + parport_release(pi->pardev); + pi->claimed = false; + } +} + +/* functions taken from libata-sff.c and converted from direct port I/O */ +static void pata_parport_dev_select(struct ata_port *ap, unsigned int device) +{ + struct pi_adapter *pi = ap->host->private_data; + u8 tmp; + + if (device == 0) + tmp = ATA_DEVICE_OBS; + else + tmp = ATA_DEVICE_OBS | ATA_DEV1; + + pi_connect(pi); + pi->proto->write_regr(pi, 0, ATA_REG_DEVICE, tmp); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + ata_sff_pause(ap); +} + +static bool pata_parport_devchk(struct ata_port *ap, unsigned int device) +{ + struct pi_adapter *pi = ap->host->private_data; + u8 nsect, lbal; + + pata_parport_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); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + + if ((nsect == 0x55) && (lbal == 0xaa)) + return true; /* we found a device */ + + return false; /* 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); + pi->proto->write_regr(pi, 1, 6, ap->ctl | ATA_SRST); + udelay(20); + pi->proto->write_regr(pi, 1, 6, ap->ctl); + ap->last_ctl = ap->ctl; + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + + /* 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 devmask = 0; + int rc; + u8 err; + + /* determine if device 0/1 are present */ + if (pata_parport_devchk(ap, 0)) + devmask |= (1 << 0); + if (pata_parport_devchk(ap, 1)) + devmask |= (1 << 1); + + /* select device 0 again */ + pata_parport_dev_select(ap, 0); + + /* issue bus reset */ + rc = pata_parport_bus_softreset(ap, devmask, deadline); + if (rc && rc != -ENODEV) { + 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 (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); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + + 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); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + + return altstatus; +} + +static void pata_parport_tf_load(struct ata_port *ap, + const struct ata_taskfile *tf) +{ + struct pi_adapter *pi = ap->host->private_data; + + 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 (tf->flags & ATA_TFLAG_ISADDR) { + if (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); + } + 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); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); +} + +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->status = pi->proto->read_regr(pi, 0, ATA_REG_STATUS); + tf->error = 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; + } + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); +} + +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); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); +} + +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); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + + 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; (pata_parport_check_status(ap) & ATA_DRQ) + && count < 65536; count += 2) { + pi_connect(pi); + pi->proto->read_block(pi, junk, 2); + mod_timer(&pi->timer, jiffies + DISCONNECT_TIMEOUT); + } + + 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 = { + .inherits = &ata_sff_port_ops, + + .softreset = pata_parport_softreset, + .hardreset = NULL, + + .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, +}; + +static 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 bool pi_probe_mode(struct pi_adapter *pi, int max, char *scratch) +{ + int best, range; + + if (pi->mode != -1) { + if (pi->mode >= max) + return false; + range = 3; + if (pi->mode >= pi->proto->epp_first) + range = 8; + if (range == 8 && pi->port % 8) + return false; + 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 bool 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); + return pi_probe_mode(pi, max, scratch); + } + } + parport_release(pi->pardev); + return false; + } + + return pi_probe_mode(pi, max, scratch); +} + +static void pata_parport_dev_release(struct device *dev) +{ + struct pi_adapter *pi = container_of(dev, struct pi_adapter, dev); + + kfree(pi); +} + +static 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, +}; + +/* temporary for old paride protocol modules */ +static struct scsi_host_template pata_parport_sht = { + PATA_PARPORT_SHT("pata_parport") +}; + +static 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; + + 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; + + 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, DRV_NAME, &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->pardev->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, &pata_parport_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); + 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); + if (pi->claimed) { + pi->proto->disconnect(pi); + parport_release(pi->pardev); + } + 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]; + + if (sscanf(buf, "%31s", device_name) < 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); + 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/block/paride/Kconfig b/drivers/block/paride/Kconfig index a295634597ba..01e4ef3655c1 100644 --- a/drivers/block/paride/Kconfig +++ b/drivers/block/paride/Kconfig @@ -92,11 +92,11 @@ config PARIDE_PG later fully support this driver. comment "Parallel IDE protocol modules" - depends on PARIDE + depends on PARIDE || PATA_PARPORT config PARIDE_ATEN tristate "ATEN EH-100 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the ATEN EH-100 parallel port IDE protocol. This protocol is used in some inexpensive low performance @@ -109,7 +109,7 @@ config PARIDE_ATEN config PARIDE_BPCK tristate "MicroSolutions backpack (Series 5) protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the Micro Solutions BACKPACK parallel port Series 5 IDE protocol. (Most BACKPACK drives made @@ -127,7 +127,7 @@ config PARIDE_BPCK config PARIDE_BPCK6 tristate "MicroSolutions backpack (Series 6) protocol" - depends on PARIDE && !64BIT + depends on (PARIDE || PATA_PARPORT) && !64BIT help This option enables support for the Micro Solutions BACKPACK parallel port Series 6 IDE protocol. (Most BACKPACK drives made @@ -146,7 +146,7 @@ config PARIDE_BPCK6 config PARIDE_COMM tristate "DataStor Commuter protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the Commuter parallel port IDE protocol from DataStor. If you chose to build PARIDE support @@ -157,7 +157,7 @@ config PARIDE_COMM config PARIDE_DSTR tristate "DataStor EP-2000 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the EP-2000 parallel port IDE protocol from DataStor. If you chose to build PARIDE support @@ -168,7 +168,7 @@ config PARIDE_DSTR config PARIDE_FIT2 tristate "FIT TD-2000 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the TD-2000 parallel port IDE protocol from Fidelity International Technology. This is a simple @@ -181,7 +181,7 @@ config PARIDE_FIT2 config PARIDE_FIT3 tristate "FIT TD-3000 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the TD-3000 parallel port IDE protocol from Fidelity International Technology. This protocol is @@ -194,7 +194,7 @@ config PARIDE_FIT3 config PARIDE_EPAT tristate "Shuttle EPAT/EPEZ protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the EPAT parallel port IDE protocol. EPAT is a parallel port IDE adapter manufactured by Shuttle @@ -216,7 +216,7 @@ config PARIDE_EPATC8 config PARIDE_EPIA tristate "Shuttle EPIA protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the (obsolete) EPIA parallel port IDE protocol from Shuttle Technology. This adapter can still be @@ -228,7 +228,7 @@ config PARIDE_EPIA config PARIDE_FRIQ tristate "Freecom IQ ASIC-2 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for version 2 of the Freecom IQ parallel port IDE adapter. This adapter is used by the Maxell Superdisk @@ -240,7 +240,7 @@ config PARIDE_FRIQ config PARIDE_FRPW tristate "FreeCom power protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the Freecom power parallel port IDE protocol. If you chose to build PARIDE support into your kernel, you @@ -251,7 +251,7 @@ config PARIDE_FRPW config PARIDE_KBIC tristate "KingByte KBIC-951A/971A protocols" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the KBIC-951A and KBIC-971A parallel port IDE protocols from KingByte Information Corp. KingByte's @@ -264,7 +264,7 @@ config PARIDE_KBIC config PARIDE_KTTI tristate "KT PHd protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the "PHd" parallel port IDE protocol from KT Technology. This is a simple (low speed) adapter that is @@ -277,7 +277,7 @@ config PARIDE_KTTI config PARIDE_ON20 tristate "OnSpec 90c20 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the (obsolete) 90c20 parallel port IDE protocol from OnSpec (often marketed under the ValuStore brand @@ -289,7 +289,7 @@ config PARIDE_ON20 config PARIDE_ON26 tristate "OnSpec 90c26 protocol" - depends on PARIDE + depends on PARIDE || PATA_PARPORT help This option enables support for the 90c26 parallel port IDE protocol from OnSpec Electronics (often marketed under the ValuStore brand diff --git a/drivers/block/paride/paride.h b/drivers/block/paride/paride.h index ddb9e589da7f..24dcfadb782d 100644 --- a/drivers/block/paride/paride.h +++ b/drivers/block/paride/paride.h @@ -1,3 +1,15 @@ +/* + * The low-level protocol modules are used by either paride or pata_parport. + * These two are mutually exclusive because the compiled low-level protocol + * modules are not compatible. + * When PATA_PARPORT is enabled, include pata_parport.h instead of the rest + * of this file. + */ + +#if IS_ENABLED(CONFIG_PATA_PARPORT) +#include <linux/pata_parport.h> + +#else #ifndef __DRIVERS_PARIDE_H__ #define __DRIVERS_PARIDE_H__ @@ -170,3 +182,4 @@ void pi_unregister_driver(void *); #endif /* __DRIVERS_PARIDE_H__ */ /* end of paride.h */ +#endif /* IS_ENABLED(CONFIG_PATA_PARPORT) */ diff --git a/include/linux/pata_parport.h b/include/linux/pata_parport.h new file mode 100644 index 000000000000..f1ba57bb319c --- /dev/null +++ b/include/linux/pata_parport.h @@ -0,0 +1,108 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * pata_parport.h (c) 1997-8 Grant R. Guenther <grant@xxxxxxxxxx> + * Under the terms of the GPL. + * + * This file defines the interface for parallel port IDE adapter chip drivers. + */ + +#include <linux/libata.h> + +#define PI_PCD 1 /* dummy for paride protocol modules */ + +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 devtype; /* dummy for paride protocol modules */ + char *device; /* dummy for paride protocol modules */ + 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 */ + bool claimed; /* parport has already been claimed */ + struct timer_list timer; /* disconnect timer */ +}; + +typedef struct pi_adapter PIA; /* for paride protocol modules */ + +/* 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]; + + int max_mode; + int epp_first; /* modes >= this use 8 ports */ + + int default_delay; + 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 + +int pata_parport_register_driver(struct pi_protocol *pr); +void pata_parport_unregister_driver(struct pi_protocol *pr); +/* defines for old paride protocol modules */ +#define paride_register pata_parport_register_driver +#define paride_unregister pata_parport_unregister_driver -- Ondrej Zary
