1 /* 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
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/stddef.h>
77 #include <linux/module.h>
78 #include <linux/kernel.h>
79 #include <linux/ioport.h>
80 #include <linux/delay.h>
81 #include <linux/proc_fs.h>
82 #include <linux/stat.h>
83 #include <linux/blkdev.h>
84 #include <linux/sched.h>
85 #include <linux/interrupt.h>
86
87 #include <asm/io.h>
88 #include <scsi/scsi_host.h>
89 /* batteries not included :-) */
90
91 /*
92 * modes in which the driver can operate
93 */
94 #define PPA_AUTODETECT 0 /* Autodetect mode */
95 #define PPA_NIBBLE 1 /* work in standard 4 bit mode */
96 #define PPA_PS2 2 /* PS/2 byte mode */
97 #define PPA_EPP_8 3 /* EPP mode, 8 bit */
98 #define PPA_EPP_16 4 /* EPP mode, 16 bit */
99 #define PPA_EPP_32 5 /* EPP mode, 32 bit */
100 #define PPA_UNKNOWN 6 /* Just in case... */
101
102 static char *PPA_MODE_STRING[] =
103 {
104 "Autodetect",
105 "SPP",
106 "PS/2",
107 "EPP 8 bit",
108 "EPP 16 bit",
109 #ifdef CONFIG_SCSI_IZIP_EPP16
110 "EPP 16 bit",
111 #else
112 "EPP 32 bit",
113 #endif
114 "Unknown"};
115
116 /* other options */
117 #define PPA_BURST_SIZE 512 /* data burst size */
118 #define PPA_SELECT_TMO 5000 /* how long to wait for target ? */
119 #define PPA_SPIN_TMO 50000 /* ppa_wait loop limiter */
120 #define PPA_RECON_TMO 500 /* scsi reconnection loop limiter */
121 #define PPA_DEBUG 0 /* debugging option */
122 #define IN_EPP_MODE(x) (x == PPA_EPP_8 || x == PPA_EPP_16 || x == PPA_EPP_32)
123
124 /* args to ppa_connect */
125 #define CONNECT_EPP_MAYBE 1
126 #define CONNECT_NORMAL 0
127
128 #define r_dtr(x) (unsigned char)inb((x))
129 #define r_str(x) (unsigned char)inb((x)+1)
130 #define r_ctr(x) (unsigned char)inb((x)+2)
131 #define r_epp(x) (unsigned char)inb((x)+4)
132 #define r_fifo(x) (unsigned char)inb((x)) /* x must be base_hi */
133 /* On PCI is base+0x400 != base_hi */
134 #define r_ecr(x) (unsigned char)inb((x)+0x2) /* x must be base_hi */
135
136 #define w_dtr(x,y) outb(y, (x))
137 #define w_str(x,y) outb(y, (x)+1)
138 #define w_epp(x,y) outb(y, (x)+4)
139 #define w_fifo(x,y) outb(y, (x)) /* x must be base_hi */
140 #define w_ecr(x,y) outb(y, (x)+0x2)/* x must be base_hi */
141
142 #ifdef CONFIG_SCSI_IZIP_SLOW_CTR
143 #define w_ctr(x,y) outb_p(y, (x)+2)
144 #else
145 #define w_ctr(x,y) outb(y, (x)+2)
146 #endif
147
148 static int ppa_engine(ppa_struct *, struct scsi_cmnd *);
149
150 #endif /* _PPA_H */
151
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