1 /*
2 backpack.c (c) 2001 Micro Solutions Inc.
3 Released under the terms of the GNU General Public license
4
5 backpack.c is a low-level protocol driver for the Micro Solutions
6 "BACKPACK" parallel port IDE adapter
7 (Works on Series 6 drives)
8
9 Written by: Ken Hahn (linux-dev@micro-solutions.com)
10 Clive Turvey (linux-dev@micro-solutions.com)
11
12 */
13
14 /*
15 This is Ken's linux wrapper for the PPC library
16 Version 1.0.0 is the backpack driver for which source is not available
17 Version 2.0.0 is the first to have source released
18 Version 2.0.1 is the "Cox-ified" source code
19 Version 2.0.2 - fixed version string usage, and made ppc functions static
20 */
21
22
23 /* PARAMETERS */
24 static int verbose; /* set this to 1 to see debugging messages and whatnot */
25
26 #define BACKPACK_VERSION "2.0.2"
27
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <asm/io.h>
34 #include <linux/parport.h>
35
36 #include "ppc6lnx.c"
37 #include "paride.h"
38
39
40
41 #define PPCSTRUCT(pi) ((Interface *)(pi->private))
42
43 /****************************************************************/
44 /*
45 ATAPI CDROM DRIVE REGISTERS
46 */
47 #define ATAPI_DATA 0 /* data port */
48 #define ATAPI_ERROR 1 /* error register (read) */
49 #define ATAPI_FEATURES 1 /* feature register (write) */
50 #define ATAPI_INT_REASON 2 /* interrupt reason register */
51 #define ATAPI_COUNT_LOW 4 /* byte count register (low) */
52 #define ATAPI_COUNT_HIGH 5 /* byte count register (high) */
53 #define ATAPI_DRIVE_SEL 6 /* drive select register */
54 #define ATAPI_STATUS 7 /* status port (read) */
55 #define ATAPI_COMMAND 7 /* command port (write) */
56 #define ATAPI_ALT_STATUS 0x0e /* alternate status reg (read) */
57 #define ATAPI_DEVICE_CONTROL 0x0e /* device control (write) */
58 /****************************************************************/
59
60 static int bpck6_read_regr(PIA *pi, int cont, int reg)
61 {
62 unsigned int out;
63
64 /* check for bad settings */
65 if (reg<0 || reg>7 || cont<0 || cont>2)
66 {
67 return(-1);
68 }
69 out=ppc6_rd_port(PPCSTRUCT(pi),cont?reg|8:reg);
70 return(out);
71 }
72
73 static void bpck6_write_regr(PIA *pi, int cont, int reg, int val)
74 {
75 /* check for bad settings */
76 if (reg>=0 && reg<=7 && cont>=0 && cont<=1)
77 {
78 ppc6_wr_port(PPCSTRUCT(pi),cont?reg|8:reg,(u8)val);
79 }
80 }
81
82 static void bpck6_write_block( PIA *pi, char * buf, int len )
83 {
84 ppc6_wr_port16_blk(PPCSTRUCT(pi),ATAPI_DATA,buf,(u32)len>>1);
85 }
86
87 static void bpck6_read_block( PIA *pi, char * buf, int len )
88 {
89 ppc6_rd_port16_blk(PPCSTRUCT(pi),ATAPI_DATA,buf,(u32)len>>1);
90 }
91
92 static void bpck6_connect ( PIA *pi )
93 {
94 if(verbose)
95 {
96 printk(KERN_DEBUG "connect\n");
97 }
98
99 if(pi->mode >=2)
100 {
101 PPCSTRUCT(pi)->mode=4+pi->mode-2;
102 }
103 else if(pi->mode==1)
104 {
105 PPCSTRUCT(pi)->mode=3;
106 }
107 else
108 {
109 PPCSTRUCT(pi)->mode=1;
110 }
111
112 ppc6_open(PPCSTRUCT(pi));
113 ppc6_wr_extout(PPCSTRUCT(pi),0x3);
114 }
115
116 static void bpck6_disconnect ( PIA *pi )
117 {
118 if(verbose)
119 {
120 printk("disconnect\n");
121 }
122 ppc6_wr_extout(PPCSTRUCT(pi),0x0);
123 ppc6_close(PPCSTRUCT(pi));
124 }
125
126 static int bpck6_test_port ( PIA *pi ) /* check for 8-bit port */
127 {
128 if(verbose)
129 {
130 printk(KERN_DEBUG "PARPORT indicates modes=%x for lp=0x%lx\n",
131 ((struct pardevice*)(pi->pardev))->port->modes,
132 ((struct pardevice *)(pi->pardev))->port->base);
133 }
134
135 /*copy over duplicate stuff.. initialize state info*/
136 PPCSTRUCT(pi)->ppc_id=pi->unit;
137 PPCSTRUCT(pi)->lpt_addr=pi->port;
138
139 /* look at the parport device to see if what modes we can use */
140 if(((struct pardevice *)(pi->pardev))->port->modes &
141 (PARPORT_MODE_EPP)
142 )
143 {
144 return 5; /* Can do EPP*/
145 }
146 else if(((struct pardevice *)(pi->pardev))->port->modes &
147 (PARPORT_MODE_TRISTATE)
148 )
149 {
150 return 2;
151 }
152 else /*Just flat SPP*/
153 {
154 return 1;
155 }
156 }
157
158 static int bpck6_probe_unit ( PIA *pi )
159 {
160 int out;
161
162 if(verbose)
163 {
164 printk(KERN_DEBUG "PROBE UNIT %x on port:%x\n",pi->unit,pi->port);
165 }
166
167 /*SET PPC UNIT NUMBER*/
168 PPCSTRUCT(pi)->ppc_id=pi->unit;
169
170 /*LOWER DOWN TO UNIDIRECTIONAL*/
171 PPCSTRUCT(pi)->mode=1;
172
173 out=ppc6_open(PPCSTRUCT(pi));
174
175 if(verbose)
176 {
177 printk(KERN_DEBUG "ppc_open returned %2x\n",out);
178 }
179
180 if(out)
181 {
182 ppc6_close(PPCSTRUCT(pi));
183 if(verbose)
184 {
185 printk(KERN_DEBUG "leaving probe\n");
186 }
187 return(1);
188 }
189 else
190 {
191 if(verbose)
192 {
193 printk(KERN_DEBUG "Failed open\n");
194 }
195 return(0);
196 }
197 }
198
199 static void bpck6_log_adapter( PIA *pi, char * scratch, int verbose )
200 {
201 char *mode_string[5]=
202 {"4-bit","8-bit","EPP-8","EPP-16","EPP-32"};
203
204 printk("%s: BACKPACK Protocol Driver V"BACKPACK_VERSION"\n",pi->device);
205 printk("%s: Copyright 2001 by Micro Solutions, Inc., DeKalb IL.\n",pi->device);
206 printk("%s: BACKPACK %s, Micro Solutions BACKPACK Drive at 0x%x\n",
207 pi->device,BACKPACK_VERSION,pi->port);
208 printk("%s: Unit: %d Mode:%d (%s) Delay %d\n",pi->device,
209 pi->unit,pi->mode,mode_string[pi->mode],pi->delay);
210 }
211
212 static int bpck6_init_proto(PIA *pi)
213 {
214 Interface *p = kzalloc(sizeof(Interface), GFP_KERNEL);
215
216 if (p) {
217 pi->private = (unsigned long)p;
218 return 0;
219 }
220
221 printk(KERN_ERR "%s: ERROR COULDN'T ALLOCATE MEMORY\n", pi->device);
222 return -1;
223 }
224
225 static void bpck6_release_proto(PIA *pi)
226 {
227 kfree((void *)(pi->private));
228 }
229
230 static struct pi_protocol bpck6 = {
231 .owner = THIS_MODULE,
232 .name = "bpck6",
233 .max_mode = 5,
234 .epp_first = 2, /* 2-5 use epp (need 8 ports) */
235 .max_units = 255,
236 .write_regr = bpck6_write_regr,
237 .read_regr = bpck6_read_regr,
238 .write_block = bpck6_write_block,
239 .read_block = bpck6_read_block,
240 .connect = bpck6_connect,
241 .disconnect = bpck6_disconnect,
242 .test_port = bpck6_test_port,
243 .probe_unit = bpck6_probe_unit,
244 .log_adapter = bpck6_log_adapter,
245 .init_proto = bpck6_init_proto,
246 .release_proto = bpck6_release_proto,
247 };
248
249 static int __init bpck6_init(void)
250 {
251 printk(KERN_INFO "bpck6: BACKPACK Protocol Driver V"BACKPACK_VERSION"\n");
252 printk(KERN_INFO "bpck6: Copyright 2001 by Micro Solutions, Inc., DeKalb IL. USA\n");
253 if(verbose)
254 printk(KERN_DEBUG "bpck6: verbose debug enabled.\n");
255 return paride_register(&bpck6);
256 }
257
258 static void __exit bpck6_exit(void)
259 {
260 paride_unregister(&bpck6);
261 }
262
263 MODULE_LICENSE("GPL");
264 MODULE_AUTHOR("Micro Solutions Inc.");
265 MODULE_DESCRIPTION("BACKPACK Protocol module, compatible with PARIDE");
266 module_param(verbose, bool, 0644);
267 module_init(bpck6_init)
268 module_exit(bpck6_exit)
269
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