1 /*
2 epat.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 This is the low level protocol driver for the EPAT parallel
6 to IDE adapter from Shuttle Technologies. This adapter is
7 used in many popular parallel port disk products such as the
8 SyQuest EZ drives, the Avatar Shark and the Imation SuperDisk.
9
10 */
11
12 /* Changes:
13
14 1.01 GRG 1998.05.06 init_proto, release_proto
15 1.02 Joshua b. Jore CPP(renamed), epat_connect, epat_disconnect
16
17 */
18
19 #define EPAT_VERSION "1.02"
20
21 #include <linux/module.h>
22 #include <linux/delay.h>
23 #include <linux/kernel.h>
24 #include <linux/types.h>
25 #include <linux/wait.h>
26 #include <asm/io.h>
27
28 #include "paride.h"
29
30 #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0))
31 #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0))
32
33 /* cont = 0 IDE register file
34 cont = 1 IDE control registers
35 cont = 2 internal EPAT registers
36 */
37
38 static int cont_map[3] = { 0x18, 0x10, 0 };
39
epat_write_regr(PIA * pi,int cont,int regr,int val)40 static void epat_write_regr( PIA *pi, int cont, int regr, int val)
41
42 { int r;
43
44 r = regr + cont_map[cont];
45
46 switch (pi->mode) {
47
48 case 0:
49 case 1:
50 case 2: w0(0x60+r); w2(1); w0(val); w2(4);
51 break;
52
53 case 3:
54 case 4:
55 case 5: w3(0x40+r); w4(val);
56 break;
57
58 }
59 }
60
epat_read_regr(PIA * pi,int cont,int regr)61 static int epat_read_regr( PIA *pi, int cont, int regr )
62
63 { int a, b, r;
64
65 r = regr + cont_map[cont];
66
67 switch (pi->mode) {
68
69 case 0: w0(r); w2(1); w2(3);
70 a = r1(); w2(4); b = r1();
71 return j44(a,b);
72
73 case 1: w0(0x40+r); w2(1); w2(4);
74 a = r1(); b = r2(); w0(0xff);
75 return j53(a,b);
76
77 case 2: w0(0x20+r); w2(1); w2(0x25);
78 a = r0(); w2(4);
79 return a;
80
81 case 3:
82 case 4:
83 case 5: w3(r); w2(0x24); a = r4(); w2(4);
84 return a;
85
86 }
87 return -1; /* never gets here */
88 }
89
epat_read_block(PIA * pi,char * buf,int count)90 static void epat_read_block( PIA *pi, char * buf, int count )
91
92 { int k, ph, a, b;
93
94 switch (pi->mode) {
95
96 case 0: w0(7); w2(1); w2(3); w0(0xff);
97 ph = 0;
98 for(k=0;k<count;k++) {
99 if (k == count-1) w0(0xfd);
100 w2(6+ph); a = r1();
101 if (a & 8) b = a;
102 else { w2(4+ph); b = r1(); }
103 buf[k] = j44(a,b);
104 ph = 1 - ph;
105 }
106 w0(0); w2(4);
107 break;
108
109 case 1: w0(0x47); w2(1); w2(5); w0(0xff);
110 ph = 0;
111 for(k=0;k<count;k++) {
112 if (k == count-1) w0(0xfd);
113 w2(4+ph);
114 a = r1(); b = r2();
115 buf[k] = j53(a,b);
116 ph = 1 - ph;
117 }
118 w0(0); w2(4);
119 break;
120
121 case 2: w0(0x27); w2(1); w2(0x25); w0(0);
122 ph = 0;
123 for(k=0;k<count-1;k++) {
124 w2(0x24+ph);
125 buf[k] = r0();
126 ph = 1 - ph;
127 }
128 w2(0x26); w2(0x27); buf[count-1] = r0();
129 w2(0x25); w2(4);
130 break;
131
132 case 3: w3(0x80); w2(0x24);
133 for(k=0;k<count-1;k++) buf[k] = r4();
134 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
135 w2(4);
136 break;
137
138 case 4: w3(0x80); w2(0x24);
139 for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
140 buf[count-2] = r4();
141 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
142 w2(4);
143 break;
144
145 case 5: w3(0x80); w2(0x24);
146 for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
147 for(k=count-4;k<count-1;k++) buf[k] = r4();
148 w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4();
149 w2(4);
150 break;
151
152 }
153 }
154
epat_write_block(PIA * pi,char * buf,int count)155 static void epat_write_block( PIA *pi, char * buf, int count )
156
157 { int ph, k;
158
159 switch (pi->mode) {
160
161 case 0:
162 case 1:
163 case 2: w0(0x67); w2(1); w2(5);
164 ph = 0;
165 for(k=0;k<count;k++) {
166 w0(buf[k]);
167 w2(4+ph);
168 ph = 1 - ph;
169 }
170 w2(7); w2(4);
171 break;
172
173 case 3: w3(0xc0);
174 for(k=0;k<count;k++) w4(buf[k]);
175 w2(4);
176 break;
177
178 case 4: w3(0xc0);
179 for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]);
180 w2(4);
181 break;
182
183 case 5: w3(0xc0);
184 for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]);
185 w2(4);
186 break;
187
188 }
189 }
190
191 /* these macros access the EPAT registers in native addressing */
192
193 #define WR(r,v) epat_write_regr(pi,2,r,v)
194 #define RR(r) (epat_read_regr(pi,2,r))
195
196 /* and these access the IDE task file */
197
198 #define WRi(r,v) epat_write_regr(pi,0,r,v)
199 #define RRi(r) (epat_read_regr(pi,0,r))
200
201 /* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */
202
203 #define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\
204 w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
205
epat_connect(PIA * pi)206 static void epat_connect ( PIA *pi )
207
208 { pi->saved_r0 = r0();
209 pi->saved_r2 = r2();
210
211 #ifdef CONFIG_PARIDE_EPATC8
212 /* Initialize the chip */
213 CPP(0);CPP(0x40);CPP(0xe0);
214 w0(0);w2(1);w2(4);
215 WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10);
216 WR(0xe,0xf);WR(0xf,4);
217 /* WR(0xe,0xa);WR(0xf,4); */
218 WR(0xe,0xd);WR(0xf,0);
219 /* CPP(0x30); */
220
221 /* Connect to the chip */
222 CPP(0xe0);
223 w0(0);w2(1);w2(4); /* Idle into SPP */
224 if (pi->mode >= 3) {
225 w0(0);w2(1);w2(4);w2(0xc);
226 /* Request EPP */
227 w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4);
228 }
229 #else
230 CPP(0); CPP(0xe0);
231 w0(0); w2(1); w2(4);
232 if (pi->mode >= 3) {
233 w0(0); w2(1); w2(4); w2(0xc);
234 w0(0x40); w2(6); w2(7); w2(4); w2(0xc); w2(4);
235 }
236 WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10);
237 #endif
238 }
239
epat_disconnect(PIA * pi)240 static void epat_disconnect (PIA *pi)
241 { CPP(0x30);
242 w0(pi->saved_r0);
243 w2(pi->saved_r2);
244 }
245
epat_test_proto(PIA * pi,char * scratch,int verbose)246 static int epat_test_proto( PIA *pi, char * scratch, int verbose )
247
248 { int k, j, f, cc;
249 int e[2] = {0,0};
250
251 epat_connect(pi);
252 cc = RR(0xd);
253 epat_disconnect(pi);
254
255 epat_connect(pi);
256 for (j=0;j<2;j++) {
257 WRi(6,0xa0+j*0x10);
258 for (k=0;k<256;k++) {
259 WRi(2,k^0xaa);
260 WRi(3,k^0x55);
261 if (RRi(2) != (k^0xaa)) e[j]++;
262 }
263 }
264 epat_disconnect(pi);
265
266 f = 0;
267 epat_connect(pi);
268 WR(0x13,1); WR(0x13,0); WR(0xa,0x11);
269 epat_read_block(pi,scratch,512);
270
271 for (k=0;k<256;k++) {
272 if ((scratch[2*k] & 0xff) != k) f++;
273 if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++;
274 }
275 epat_disconnect(pi);
276
277 if (verbose) {
278 printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n",
279 pi->device,pi->port,pi->mode,cc,e[0],e[1],f);
280 }
281
282 return (e[0] && e[1]) || f;
283 }
284
epat_log_adapter(PIA * pi,char * scratch,int verbose)285 static void epat_log_adapter( PIA *pi, char * scratch, int verbose )
286
287 { int ver;
288 char *mode_string[6] =
289 {"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"};
290
291 epat_connect(pi);
292 WR(0xa,0x38); /* read the version code */
293 ver = RR(0xb);
294 epat_disconnect(pi);
295
296 printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ",
297 pi->device,EPAT_VERSION,ver,pi->port);
298 printk("mode %d (%s), delay %d\n",pi->mode,
299 mode_string[pi->mode],pi->delay);
300
301 }
302
epat_init_proto(PIA * pi)303 static void epat_init_proto( PIA *pi)
304
305 { MOD_INC_USE_COUNT;
306 }
307
epat_release_proto(PIA * pi)308 static void epat_release_proto( PIA *pi)
309
310 { MOD_DEC_USE_COUNT;
311 }
312
313 struct pi_protocol epat = {"epat",0,6,3,1,1,
314 epat_write_regr,
315 epat_read_regr,
316 epat_write_block,
317 epat_read_block,
318 epat_connect,
319 epat_disconnect,
320 0,
321 0,
322 epat_test_proto,
323 epat_log_adapter,
324 epat_init_proto,
325 epat_release_proto
326 };
327
328
329 #ifdef MODULE
330
init_module(void)331 int init_module(void)
332
333 { return pi_register( &epat) - 1;
334 }
335
cleanup_module(void)336 void cleanup_module(void)
337
338 { pi_unregister( &epat);
339 }
340
341 #endif
342
343 /* end of epat.c */
344 MODULE_LICENSE("GPL");
345