File: /usr/src/linux/drivers/char/ftape/lowlevel/fc-10.c
1 /*
2 *
3
4 Copyright (C) 1993,1994 Jon Tombs.
5
6 This program is distributed in the hope that it will be useful,
7 but WITHOUT ANY WARRANTY; without even the implied warranty of
8 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 GNU General Public License for more details.
10
11 The entire guts of this program was written by dosemu, modified to
12 record reads and writes to the ports in the 0x180-0x188 address space,
13 while running the CMS program TAPE.EXE V2.0.5 supplied with the drive.
14
15 Modified to use an array of addresses and generally cleaned up (made
16 much shorter) 4 June 94, dosemu isn't that good at writing short code it
17 would seem :-). Made independent of 0x180, but I doubt it will work
18 at any other address.
19
20 Modified for distribution with ftape source. 21 June 94, SJL.
21
22 Modifications on 20 October 95, by Daniel Cohen (catman@wpi.edu):
23 Modified to support different DMA, IRQ, and IO Ports. Borland's
24 Turbo Debugger in virtual 8086 mode (TD386.EXE with hardware breakpoints
25 provided by the TDH386.SYS Device Driver) was used on the CMS program
26 TAPE V4.0.5. I set breakpoints on I/O to ports 0x180-0x187. Note that
27 CMS's program will not successfully configure the tape drive if you set
28 breakpoints on IO Reads, but you can set them on IO Writes without problems.
29 Known problems:
30 - You can not use DMA Channels 5 or 7.
31
32 Modification on 29 January 96, by Daniel Cohen (catman@wpi.edu):
33 Modified to only accept IRQs 3 - 7, or 9. Since we can only send a 3 bit
34 number representing the IRQ to the card, special handling is required when
35 IRQ 9 is selected. IRQ 2 and 9 are the same, and we should request IRQ 9
36 from the kernel while telling the card to use IRQ 2. Thanks to Greg
37 Crider (gcrider@iclnet.org) for finding and locating this bug, as well as
38 testing the patch.
39
40 Modification on 11 December 96, by Claus Heine (claus@momo.math.rwth-aachen.de):
41 Modified a little to use variahle ft_fdc_base, ft_fdc_irq, ft_fdc_dma
42 instead of preprocessor symbols. Thus we can compile this into the module
43 or kernel and let the user specify the options as command line arguments.
44
45 *
46 * $Source: /homes/cvs/ftape-stacked/ftape/lowlevel/fc-10.c,v $
47 * $Revision: 1.2 $
48 * $Date: 1997/10/05 19:18:04 $
49 *
50 * This file contains code for the CMS FC-10/FC-20 card.
51 */
52
53 #include <asm/io.h>
54 #include <linux/ftape.h>
55 #include "../lowlevel/ftape-tracing.h"
56 #include "../lowlevel/fdc-io.h"
57 #include "../lowlevel/fc-10.h"
58
59 __u16 inbs_magic[] = {
60 0x3, 0x3, 0x0, 0x4, 0x7, 0x2, 0x5, 0x3, 0x1, 0x4,
61 0x3, 0x5, 0x2, 0x0, 0x3, 0x7, 0x4, 0x2,
62 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7
63 };
64
65 __u16 fc10_ports[] = {
66 0x180, 0x210, 0x2A0, 0x300, 0x330, 0x340, 0x370
67 };
68
69 int fc10_enable(void)
70 {
71 int i;
72 __u8 cardConfig = 0x00;
73 __u8 x;
74 TRACE_FUN(ft_t_flow);
75
76 /* This code will only work if the FC-10 (or FC-20) is set to
77 * use DMA channels 1, 2, or 3. DMA channels 5 and 7 seem to be
78 * initialized by the same command as channels 1 and 3, respectively.
79 */
80 if (ft_fdc_dma > 3) {
81 TRACE_ABORT(0, ft_t_err,
82 "Error: The FC-10/20 must be set to use DMA channels 1, 2, or 3!");
83 }
84 /* Only allow the FC-10/20 to use IRQ 3-7, or 9. Note that CMS's program
85 * only accepts IRQ's 2-7, but in linux, IRQ 2 is the same as IRQ 9.
86 */
87 if (ft_fdc_irq < 3 || ft_fdc_irq == 8 || ft_fdc_irq > 9) {
88 TRACE_ABORT(0, ft_t_err,
89 "Error: The FC-10/20 must be set to use IRQ levels 3 - 7, or 9!\n"
90 KERN_INFO "Note: IRQ 9 is the same as IRQ 2");
91 }
92 /* Clear state machine ???
93 */
94 for (i = 0; i < NR_ITEMS(inbs_magic); i++) {
95 inb(ft_fdc_base + inbs_magic[i]);
96 }
97 outb(0x0, ft_fdc_base);
98
99 x = inb(ft_fdc_base);
100 if (x == 0x13 || x == 0x93) {
101 for (i = 1; i < 8; i++) {
102 if (inb(ft_fdc_base + i) != x) {
103 TRACE_EXIT 0;
104 }
105 }
106 } else {
107 TRACE_EXIT 0;
108 }
109
110 outb(0x8, ft_fdc_base);
111
112 for (i = 0; i < 8; i++) {
113 if (inb(ft_fdc_base + i) != 0x0) {
114 TRACE_EXIT 0;
115 }
116 }
117 outb(0x10, ft_fdc_base);
118
119 for (i = 0; i < 8; i++) {
120 if (inb(ft_fdc_base + i) != 0xff) {
121 TRACE_EXIT 0;
122 }
123 }
124
125 /* Okay, we found a FC-10 card ! ???
126 */
127 outb(0x0, fdc.ccr);
128
129 /* Clear state machine again ???
130 */
131 for (i = 0; i < NR_ITEMS(inbs_magic); i++) {
132 inb(ft_fdc_base + inbs_magic[i]);
133 }
134 /* Send io port */
135 for (i = 0; i < NR_ITEMS(fc10_ports); i++)
136 if (ft_fdc_base == fc10_ports[i])
137 cardConfig = i + 1;
138 if (cardConfig == 0) {
139 TRACE_EXIT 0; /* Invalid I/O Port */
140 }
141 /* and IRQ - If using IRQ 9, tell the FC card it is actually IRQ 2 */
142 if (ft_fdc_irq != 9)
143 cardConfig |= ft_fdc_irq << 3;
144 else
145 cardConfig |= 2 << 3;
146
147 /* and finally DMA Channel */
148 cardConfig |= ft_fdc_dma << 6;
149 outb(cardConfig, ft_fdc_base); /* DMA [2 bits]/IRQ [3 bits]/BASE [3 bits] */
150
151 /* Enable FC-10 ???
152 */
153 outb(0, fdc.ccr);
154 outb(0, fdc.dor2);
155 outb(FDC_DMA_MODE /* 8 */, fdc.dor);
156 outb(FDC_DMA_MODE /* 8 */, fdc.dor);
157 outb(1, fdc.dor2);
158
159 /*************************************
160 *
161 * cH: why the hell should this be necessary? This is done
162 * by fdc_reset()!!!
163 *
164 *************************************/
165 /* Initialize fdc, select drive B:
166 */
167 outb(FDC_DMA_MODE, fdc.dor); /* assert reset, dma & irq enabled */
168 /* 0x08 */
169 outb(FDC_DMA_MODE|FDC_RESET_NOT, fdc.dor); /* release reset */
170 /* 0x08 | 0x04 = 0x0c */
171 outb(FDC_DMA_MODE|FDC_RESET_NOT|FDC_MOTOR_1|FTAPE_SEL_B, fdc.dor);
172 /* 0x08 | 0x04 | 0x20 | 0x01 = 0x2d */
173 /* select drive 1 */ /* why not drive 0 ???? */
174 TRACE_EXIT (x == 0x93) ? 2 : 1;
175 }
176