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