blob: f6e1a1574bb86e56587290b85988f4a03dbfae36 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Driver for the PPA3 parallel port SCSI HBA embedded in
2 * the Iomega ZIP drive
3 *
4 * (c) 1996 Grant R. Guenther grant@torque.net
5 * David Campbell campbell@torque.net
6 *
7 * All comments to David.
8 */
9
10#ifndef _PPA_H
11#define _PPA_H
12
13#define PPA_VERSION "2.07 (for Linux 2.4.x)"
14
15/*
16 * this driver has been hacked by Matteo Frigo (athena@theory.lcs.mit.edu)
17 * to support EPP and scatter-gather. [0.26-athena]
18 *
19 * additional hacks by David Campbell
20 * in response to this driver "mis-behaving" on his machine.
21 * Fixed EPP to handle "software" changing of EPP port data direction.
22 * Chased down EPP timeouts
23 * Made this driver "kernel version friendly" [0.28-athena]
24 *
25 * [ Stuff removed ]
26 *
27 * Corrected ppa.h for 2.1.x kernels (>=2.1.85)
28 * Modified "Nat Semi Kludge" for extended chipsets
29 * [1.41]
30 *
31 * Fixed id_probe for EPP 1.9 chipsets (misdetected as EPP 1.7)
32 * [1.42]
33 *
34 * Development solely for 2.1.x kernels from now on!
35 * [2.00]
36 *
37 * Hack and slash at the init code (EPP device check routine)
38 * Added INSANE option.
39 * [2.01]
40 *
41 * Patch applied to sync against the 2.1.x kernel code
42 * Included qboot_zip.sh
43 * [2.02]
44 *
45 * Cleaned up the mess left by someone else trying to fix the
46 * asm section to keep egcc happy. The asm section no longer
47 * exists, the nibble code is *almost* as fast as the asm code
48 * providing it is compiled with egcc.
49 *
50 * Other clean ups include the follow changes:
51 * CONFIG_SCSI_PPA_HAVE_PEDANTIC => CONFIG_SCSI_IZIP_EPP16
52 * added CONFIG_SCSI_IZIP_SLOW_CTR option
53 * [2.03]
54 *
55 * Use ppa_wait() to check for ready AND connected status bits
56 * Add ppa_wait() calls to ppa_completion()
57 * by Peter Cherriman <pjc@ecs.soton.ac.uk> and
58 * Tim Waugh <twaugh@redhat.com>
59 * [2.04]
60 *
61 * Fix kernel panic on scsi timeout, 2000-08-18 [2.05]
62 *
63 * Avoid io_request_lock problems.
64 * John Cavan <johncavan@home.com> [2.06]
65 *
66 * Busy wait for connected status bit in ppa_completion()
67 * in order to cope with some hardware that has this bit low
68 * for short periods of time.
69 * Add udelay() to ppa_select()
70 * by Peter Cherriman <pjc@ecs.soton.ac.uk> and
71 * Oleg Makarenko <omakarenko@cyberplat.ru>
72 * [2.07]
73 */
74/* ------ END OF USER CONFIGURABLE PARAMETERS ----- */
75
76#include <linux/config.h>
77#include <linux/stddef.h>
78#include <linux/module.h>
79#include <linux/kernel.h>
80#include <linux/ioport.h>
81#include <linux/delay.h>
82#include <linux/proc_fs.h>
83#include <linux/stat.h>
84#include <linux/blkdev.h>
85#include <linux/sched.h>
86#include <linux/interrupt.h>
87
88#include <asm/io.h>
89#include <scsi/scsi_host.h>
90/* batteries not included :-) */
91
92/*
93 * modes in which the driver can operate
94 */
95#define PPA_AUTODETECT 0 /* Autodetect mode */
96#define PPA_NIBBLE 1 /* work in standard 4 bit mode */
97#define PPA_PS2 2 /* PS/2 byte mode */
98#define PPA_EPP_8 3 /* EPP mode, 8 bit */
99#define PPA_EPP_16 4 /* EPP mode, 16 bit */
100#define PPA_EPP_32 5 /* EPP mode, 32 bit */
101#define PPA_UNKNOWN 6 /* Just in case... */
102
103static char *PPA_MODE_STRING[] =
104{
105 "Autodetect",
106 "SPP",
107 "PS/2",
108 "EPP 8 bit",
109 "EPP 16 bit",
110#ifdef CONFIG_SCSI_IZIP_EPP16
111 "EPP 16 bit",
112#else
113 "EPP 32 bit",
114#endif
115 "Unknown"};
116
117/* other options */
118#define PPA_BURST_SIZE 512 /* data burst size */
119#define PPA_SELECT_TMO 5000 /* how long to wait for target ? */
120#define PPA_SPIN_TMO 50000 /* ppa_wait loop limiter */
121#define PPA_RECON_TMO 500 /* scsi reconnection loop limiter */
122#define PPA_DEBUG 0 /* debugging option */
123#define IN_EPP_MODE(x) (x == PPA_EPP_8 || x == PPA_EPP_16 || x == PPA_EPP_32)
124
125/* args to ppa_connect */
126#define CONNECT_EPP_MAYBE 1
127#define CONNECT_NORMAL 0
128
129#define r_dtr(x) (unsigned char)inb((x))
130#define r_str(x) (unsigned char)inb((x)+1)
131#define r_ctr(x) (unsigned char)inb((x)+2)
132#define r_epp(x) (unsigned char)inb((x)+4)
133#define r_fifo(x) (unsigned char)inb((x)) /* x must be base_hi */
134 /* On PCI is base+0x400 != base_hi */
135#define r_ecr(x) (unsigned char)inb((x)+0x2) /* x must be base_hi */
136
137#define w_dtr(x,y) outb(y, (x))
138#define w_str(x,y) outb(y, (x)+1)
139#define w_epp(x,y) outb(y, (x)+4)
140#define w_fifo(x,y) outb(y, (x)) /* x must be base_hi */
141#define w_ecr(x,y) outb(y, (x)+0x2)/* x must be base_hi */
142
143#ifdef CONFIG_SCSI_IZIP_SLOW_CTR
144#define w_ctr(x,y) outb_p(y, (x)+2)
145#else
146#define w_ctr(x,y) outb(y, (x)+2)
147#endif
148
149static int ppa_engine(ppa_struct *, struct scsi_cmnd *);
150
151#endif /* _PPA_H */