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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [scsi/] [ppa.h] - Blame information for rev 1626

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1 1626 jcastillo
/*  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     campbell@torque.net
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 *
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 *      All comments to David.
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 */
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#include <linux/config.h> /* CONFIG_SCSI_PPA_HAVE_PEDANTIC */
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#ifndef _PPA_H
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#define _PPA_H
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#define   PPA_VERSION   "1.42"
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#if 0
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/* Use the following to enable certain chipset support
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 * Default is PEDANTIC = 3
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 */
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#ifndef CONFIG_SCSI_PPA_HAVE_PEDANTIC
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#define CONFIG_SCSI_PPA_HAVE_PEDANTIC   3
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#endif
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#endif
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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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 * Compiled against 2.1.53.
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 *      Rebuilt ppa_abort() function, should handle unplugged cable.
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 *                                                      [1.35s]
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 *
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 * PPA now auto probes for EPP on base address which are aligned on
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 * 8 byte boundaries (0x278 & 0x378) using the attached devices.
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 * This hopefully avoids the nasty problem of trying to detect EPP.
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 *      Tested on 2.1.53                                [1.36]
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 *
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 * The id_probe utility no longer performs read/write tests.
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 * Additional code included for checking the Intel ECP bug
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 * (Bit 0 of STR stuck low which fools the EPP detection routine)
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 *                                                      [1.37]
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 *
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 * Oops! Got the bit sign mixed up for the Intel bug check.
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 * Found that an additional delay is required during SCSI resets
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 * to allow devices to settle down.
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 *                                                      [1.38]
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 *
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 * Fixed all problems in the parport sharing scheme. Now ppa can be safe
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 * used with lp or other parport devices on the same parallel port.
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 *              1997 by Andrea Arcangeli
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 *                                                      [1.39]
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 *
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 * Little fix in ppa engine to ensure that ppa don' t release parport
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 * or disconnect in wrong cases.
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 *              1997 by Andrea Arcangeli
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 *                                                      [1.40]
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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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/* ------ END OF USER CONFIGURABLE PARAMETERS ----- */
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#ifdef PPA_CODE
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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/tqueue.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/blk.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  "sd.h"
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#include  "hosts.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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/* This is a global option */
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int ppa_sg = SG_ALL;            /* enable/disable scatter-gather. */
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/* other options */
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#define PPA_CAN_QUEUE   1       /* use "queueing" interface */
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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_DEBUG       0        /* debuging 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)+0x400)
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#define r_ecr(x)        (unsigned char)inb((x)+0x402)
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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_ctr(x,y)      outb(y, (x)+2)
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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)+0x400)
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#define w_ecr(x,y)      outb(y, (x)+0x402)
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static int ppa_engine(ppa_struct *, Scsi_Cmnd *);
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static int ppa_in(int, char *, int);
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static int ppa_init(int);
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static void ppa_interrupt(void *);
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static int ppa_out(int, char *, int);
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struct proc_dir_entry proc_scsi_ppa =
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{PROC_SCSI_PPA, 3, "ppa", S_IFDIR | S_IRUGO | S_IXUGO, 2};
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#else
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extern struct proc_dir_entry proc_scsi_ppa;
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#endif
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int ppa_detect(Scsi_Host_Template *);
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const char *ppa_info(struct Scsi_Host *);
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int ppa_queuecommand(Scsi_Cmnd *, void (*done) (Scsi_Cmnd *));
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int ppa_abort(Scsi_Cmnd *);
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int ppa_reset(Scsi_Cmnd *, unsigned int);
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int ppa_proc_info(char *, char **, off_t, int, int, int);
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int ppa_biosparam(Disk *, kdev_t, int *);
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#define PPA {   proc_dir:               &proc_scsi_ppa,                 \
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                proc_info:              ppa_proc_info,                  \
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                name:                   "Iomega parport ZIP drive",     \
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                detect:                 ppa_detect,                     \
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                queuecommand:           ppa_queuecommand,               \
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                abort:                  ppa_abort,                      \
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                reset:                  ppa_reset,                      \
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                bios_param:             ppa_biosparam,                  \
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                this_id:                -1,                             \
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                sg_tablesize:           SG_ALL,                         \
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                cmd_per_lun:            1,                              \
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                use_clustering:         ENABLE_CLUSTERING               \
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}
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#endif                          /* _PPA_H */

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