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authorOndrej Zary <linux@zary.sk>2023-01-23 20:09:54 +0100
committerDamien Le Moal <damien.lemoal@opensource.wdc.com>2023-01-31 09:34:41 +0900
commit246a1c4c6b7ffba88a2553d2b88f7b6280f253a2 (patch)
tree51572de71bfb670a0eb07277178a4da6fcb738e3 /drivers/ata/Kconfig
parent38d431229bfbe175b41274faa856e5b0a1ebe70d (diff)
ata: pata_parport: add driver (PARIDE replacement)
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. Unfortunately, libata drivers cannot sleep so pata_parport claims parport before activating the ata host and keeps it claimed (and protocol connected) until the ata host is removed. This means that no devices can be chained (neither other pata_parport devices nor a printer). paride and pata_parport are mutually exclusive because the compiled protocol drivers are incompatible. Tested with: - Imation SuperDisk LS-120 and HP C4381A (EPAT) - Freecom Parallel CD (FRPW) - Toshiba Mobile CD-RW 2793008 w/Freecom Parallel Cable rev.903 (FRIQ) - Backpack CD-RW 222011 and CD-RW 19350 (BPCK6) The following bugs in low-level protocol drivers were found and will be fixed later: 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) Note: EPP modes are buggy in FRPW, only modes 0 and 1 work. Signed-off-by: Ondrej Zary <linux@zary.sk> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Diffstat (limited to 'drivers/ata/Kconfig')
-rw-r--r--drivers/ata/Kconfig14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index eceaec33af65..fb646480635c 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -1162,6 +1162,20 @@ 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