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68a4f84a17
I have an Iomega Z100P2 zip drive, but it does not work with my StarTech PEX1P2 AX99100 PCIe parallel port, which evidently does not support 16-bit or 32-bit EPP. Currently the only way to tell the PPA driver to use 8-bit EPP is to write 'mode=3' to /proc/scsi/ppa/*, but the driver doesn't actually distinguish between the three EPP modes and still tries to use 16-bit or 32-bit EPP. And even if writing to that file did make the driver use 8-bit EPP, it still wouldn't do me any good because by the time that file exists, the drive has already failed to initialize. Add a new parameter /sys/module/ppa/mode to set the transfer mode before initializing the drive. This parameter replaces the use of CONFIG_SCSI_IZIP_EPP16 in the PPA driver. At the same time, default to 8-bit EPP. 16-bit and 32-bit EPP are not necessary for the drive to function, nor are they part of the IEEE 1284 standard, so the driver should not assume that they are available. Signed-off-by: Alex Henrie <alexhenrie24@gmail.com> Link: https://lore.kernel.org/r/20230807155856.362864-2-alexhenrie24@gmail.com Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
148 lines
4.9 KiB
C
148 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Driver for the PPA3 parallel port SCSI HBA embedded in
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* the Iomega ZIP drive
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*
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* (c) 1996 Grant R. Guenther grant@torque.net
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* David Campbell
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*
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* All comments to David.
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*/
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#ifndef _PPA_H
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#define _PPA_H
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#define PPA_VERSION "2.07 (for Linux 2.4.x)"
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/*
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* this driver has been hacked by Matteo Frigo (athena@theory.lcs.mit.edu)
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* to support EPP and scatter-gather. [0.26-athena]
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*
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* additional hacks by David Campbell
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* in response to this driver "mis-behaving" on his machine.
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* Fixed EPP to handle "software" changing of EPP port data direction.
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* Chased down EPP timeouts
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* Made this driver "kernel version friendly" [0.28-athena]
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*
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* [ Stuff removed ]
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*
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* Corrected ppa.h for 2.1.x kernels (>=2.1.85)
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* Modified "Nat Semi Kludge" for extended chipsets
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* [1.41]
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*
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* Fixed id_probe for EPP 1.9 chipsets (misdetected as EPP 1.7)
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* [1.42]
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*
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* Development solely for 2.1.x kernels from now on!
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* [2.00]
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*
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* Hack and slash at the init code (EPP device check routine)
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* Added INSANE option.
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* [2.01]
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*
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* Patch applied to sync against the 2.1.x kernel code
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* Included qboot_zip.sh
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* [2.02]
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*
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* Cleaned up the mess left by someone else trying to fix the
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* asm section to keep egcc happy. The asm section no longer
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* exists, the nibble code is *almost* as fast as the asm code
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* providing it is compiled with egcc.
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*
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* Other clean ups include the follow changes:
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* CONFIG_SCSI_PPA_HAVE_PEDANTIC => CONFIG_SCSI_IZIP_EPP16
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* added CONFIG_SCSI_IZIP_SLOW_CTR option
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* [2.03]
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*
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* Use ppa_wait() to check for ready AND connected status bits
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* Add ppa_wait() calls to ppa_completion()
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* by Peter Cherriman <pjc@ecs.soton.ac.uk> and
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* Tim Waugh <twaugh@redhat.com>
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* [2.04]
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*
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* Fix kernel panic on scsi timeout, 2000-08-18 [2.05]
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*
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* Avoid io_request_lock problems.
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* John Cavan <johncavan@home.com> [2.06]
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*
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* Busy wait for connected status bit in ppa_completion()
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* in order to cope with some hardware that has this bit low
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* for short periods of time.
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* Add udelay() to ppa_select()
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* by Peter Cherriman <pjc@ecs.soton.ac.uk> and
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* Oleg Makarenko <omakarenko@cyberplat.ru>
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* [2.07]
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*/
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/* ------ END OF USER CONFIGURABLE PARAMETERS ----- */
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/blkdev.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <scsi/scsi_host.h>
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/* batteries not included :-) */
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/*
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* modes in which the driver can operate
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*/
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#define PPA_AUTODETECT 0 /* Autodetect mode */
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#define PPA_NIBBLE 1 /* work in standard 4 bit mode */
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#define PPA_PS2 2 /* PS/2 byte mode */
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#define PPA_EPP_8 3 /* EPP mode, 8 bit */
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#define PPA_EPP_16 4 /* EPP mode, 16 bit */
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#define PPA_EPP_32 5 /* EPP mode, 32 bit */
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#define PPA_UNKNOWN 6 /* Just in case... */
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static char *PPA_MODE_STRING[] =
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{
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"Autodetect",
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"SPP",
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"PS/2",
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"EPP 8 bit",
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"EPP 16 bit",
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"EPP 32 bit",
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"Unknown"};
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/* other options */
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#define PPA_BURST_SIZE 512 /* data burst size */
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#define PPA_SELECT_TMO 5000 /* how long to wait for target ? */
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#define PPA_SPIN_TMO 50000 /* ppa_wait loop limiter */
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#define PPA_RECON_TMO 500 /* scsi reconnection loop limiter */
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#define PPA_DEBUG 0 /* debugging option */
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#define IN_EPP_MODE(x) (x == PPA_EPP_8 || x == PPA_EPP_16 || x == PPA_EPP_32)
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/* args to ppa_connect */
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#define CONNECT_EPP_MAYBE 1
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#define CONNECT_NORMAL 0
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#define r_dtr(x) (unsigned char)inb((x))
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#define r_str(x) (unsigned char)inb((x)+1)
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#define r_ctr(x) (unsigned char)inb((x)+2)
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#define r_epp(x) (unsigned char)inb((x)+4)
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#define r_fifo(x) (unsigned char)inb((x)) /* x must be base_hi */
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/* On PCI is base+0x400 != base_hi */
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#define r_ecr(x) (unsigned char)inb((x)+0x2) /* x must be base_hi */
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#define w_dtr(x,y) outb(y, (x))
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#define w_str(x,y) outb(y, (x)+1)
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#define w_epp(x,y) outb(y, (x)+4)
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#define w_fifo(x,y) outb(y, (x)) /* x must be base_hi */
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#define w_ecr(x,y) outb(y, (x)+0x2)/* x must be base_hi */
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#ifdef CONFIG_SCSI_IZIP_SLOW_CTR
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#define w_ctr(x,y) outb_p(y, (x)+2)
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#else
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#define w_ctr(x,y) outb(y, (x)+2)
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#endif
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static int ppa_engine(ppa_struct *, struct scsi_cmnd *);
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#endif /* _PPA_H */
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