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1da177e4 LT |
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/init.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/wait.h> | |
27 | #include <asm/io.h> | |
28 | ||
29 | #include "paride.h" | |
30 | ||
31 | #define j44(a,b) (((a>>4)&0x0f)+(b&0xf0)) | |
32 | #define j53(a,b) (((a>>3)&0x1f)+((b<<4)&0xe0)) | |
33 | ||
34 | static int epatc8; | |
35 | ||
36 | module_param(epatc8, int, 0); | |
37 | MODULE_PARM_DESC(epatc8, "support for the Shuttle EP1284 chip, " | |
38 | "used in any recent Imation SuperDisk (LS-120) drive."); | |
39 | ||
40 | /* cont = 0 IDE register file | |
41 | cont = 1 IDE control registers | |
42 | cont = 2 internal EPAT registers | |
43 | */ | |
44 | ||
45 | static int cont_map[3] = { 0x18, 0x10, 0 }; | |
46 | ||
47 | static void epat_write_regr( PIA *pi, int cont, int regr, int val) | |
48 | ||
49 | { int r; | |
50 | ||
51 | r = regr + cont_map[cont]; | |
52 | ||
53 | switch (pi->mode) { | |
54 | ||
55 | case 0: | |
56 | case 1: | |
57 | case 2: w0(0x60+r); w2(1); w0(val); w2(4); | |
58 | break; | |
59 | ||
60 | case 3: | |
61 | case 4: | |
62 | case 5: w3(0x40+r); w4(val); | |
63 | break; | |
64 | ||
65 | } | |
66 | } | |
67 | ||
68 | static int epat_read_regr( PIA *pi, int cont, int regr ) | |
69 | ||
70 | { int a, b, r; | |
71 | ||
72 | r = regr + cont_map[cont]; | |
73 | ||
74 | switch (pi->mode) { | |
75 | ||
76 | case 0: w0(r); w2(1); w2(3); | |
77 | a = r1(); w2(4); b = r1(); | |
78 | return j44(a,b); | |
79 | ||
80 | case 1: w0(0x40+r); w2(1); w2(4); | |
81 | a = r1(); b = r2(); w0(0xff); | |
82 | return j53(a,b); | |
83 | ||
84 | case 2: w0(0x20+r); w2(1); w2(0x25); | |
85 | a = r0(); w2(4); | |
86 | return a; | |
87 | ||
88 | case 3: | |
89 | case 4: | |
90 | case 5: w3(r); w2(0x24); a = r4(); w2(4); | |
91 | return a; | |
92 | ||
93 | } | |
94 | return -1; /* never gets here */ | |
95 | } | |
96 | ||
97 | static void epat_read_block( PIA *pi, char * buf, int count ) | |
98 | ||
99 | { int k, ph, a, b; | |
100 | ||
101 | switch (pi->mode) { | |
102 | ||
103 | case 0: w0(7); w2(1); w2(3); w0(0xff); | |
104 | ph = 0; | |
105 | for(k=0;k<count;k++) { | |
106 | if (k == count-1) w0(0xfd); | |
107 | w2(6+ph); a = r1(); | |
108 | if (a & 8) b = a; | |
109 | else { w2(4+ph); b = r1(); } | |
110 | buf[k] = j44(a,b); | |
111 | ph = 1 - ph; | |
112 | } | |
113 | w0(0); w2(4); | |
114 | break; | |
115 | ||
116 | case 1: w0(0x47); w2(1); w2(5); w0(0xff); | |
117 | ph = 0; | |
118 | for(k=0;k<count;k++) { | |
119 | if (k == count-1) w0(0xfd); | |
120 | w2(4+ph); | |
121 | a = r1(); b = r2(); | |
122 | buf[k] = j53(a,b); | |
123 | ph = 1 - ph; | |
124 | } | |
125 | w0(0); w2(4); | |
126 | break; | |
127 | ||
128 | case 2: w0(0x27); w2(1); w2(0x25); w0(0); | |
129 | ph = 0; | |
130 | for(k=0;k<count-1;k++) { | |
131 | w2(0x24+ph); | |
132 | buf[k] = r0(); | |
133 | ph = 1 - ph; | |
134 | } | |
135 | w2(0x26); w2(0x27); buf[count-1] = r0(); | |
136 | w2(0x25); w2(4); | |
137 | break; | |
138 | ||
139 | case 3: w3(0x80); w2(0x24); | |
140 | for(k=0;k<count-1;k++) buf[k] = r4(); | |
141 | w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); | |
142 | w2(4); | |
143 | break; | |
144 | ||
145 | case 4: w3(0x80); w2(0x24); | |
146 | for(k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w(); | |
147 | buf[count-2] = r4(); | |
148 | w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); | |
149 | w2(4); | |
150 | break; | |
151 | ||
152 | case 5: w3(0x80); w2(0x24); | |
153 | for(k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l(); | |
154 | for(k=count-4;k<count-1;k++) buf[k] = r4(); | |
155 | w2(4); w3(0xa0); w2(0x24); buf[count-1] = r4(); | |
156 | w2(4); | |
157 | break; | |
158 | ||
159 | } | |
160 | } | |
161 | ||
162 | static void epat_write_block( PIA *pi, char * buf, int count ) | |
163 | ||
164 | { int ph, k; | |
165 | ||
166 | switch (pi->mode) { | |
167 | ||
168 | case 0: | |
169 | case 1: | |
170 | case 2: w0(0x67); w2(1); w2(5); | |
171 | ph = 0; | |
172 | for(k=0;k<count;k++) { | |
173 | w0(buf[k]); | |
174 | w2(4+ph); | |
175 | ph = 1 - ph; | |
176 | } | |
177 | w2(7); w2(4); | |
178 | break; | |
179 | ||
180 | case 3: w3(0xc0); | |
181 | for(k=0;k<count;k++) w4(buf[k]); | |
182 | w2(4); | |
183 | break; | |
184 | ||
185 | case 4: w3(0xc0); | |
186 | for(k=0;k<(count/2);k++) w4w(((u16 *)buf)[k]); | |
187 | w2(4); | |
188 | break; | |
189 | ||
190 | case 5: w3(0xc0); | |
191 | for(k=0;k<(count/4);k++) w4l(((u32 *)buf)[k]); | |
192 | w2(4); | |
193 | break; | |
194 | ||
195 | } | |
196 | } | |
197 | ||
198 | /* these macros access the EPAT registers in native addressing */ | |
199 | ||
200 | #define WR(r,v) epat_write_regr(pi,2,r,v) | |
201 | #define RR(r) (epat_read_regr(pi,2,r)) | |
202 | ||
203 | /* and these access the IDE task file */ | |
204 | ||
205 | #define WRi(r,v) epat_write_regr(pi,0,r,v) | |
206 | #define RRi(r) (epat_read_regr(pi,0,r)) | |
207 | ||
208 | /* FIXME: the CPP stuff should be fixed to handle multiple EPATs on a chain */ | |
209 | ||
210 | #define CPP(x) w2(4);w0(0x22);w0(0xaa);w0(0x55);w0(0);w0(0xff);\ | |
211 | w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff); | |
212 | ||
213 | static void epat_connect ( PIA *pi ) | |
214 | ||
215 | { pi->saved_r0 = r0(); | |
216 | pi->saved_r2 = r2(); | |
217 | ||
218 | /* Initialize the chip */ | |
219 | CPP(0); | |
220 | ||
221 | if (epatc8) { | |
222 | CPP(0x40);CPP(0xe0); | |
223 | w0(0);w2(1);w2(4); | |
224 | WR(0x8,0x12);WR(0xc,0x14);WR(0x12,0x10); | |
225 | WR(0xe,0xf);WR(0xf,4); | |
226 | /* WR(0xe,0xa);WR(0xf,4); */ | |
227 | WR(0xe,0xd);WR(0xf,0); | |
228 | /* CPP(0x30); */ | |
229 | } | |
230 | ||
231 | /* Connect to the chip */ | |
232 | CPP(0xe0); | |
233 | w0(0);w2(1);w2(4); /* Idle into SPP */ | |
234 | if (pi->mode >= 3) { | |
235 | w0(0);w2(1);w2(4);w2(0xc); | |
236 | /* Request EPP */ | |
237 | w0(0x40);w2(6);w2(7);w2(4);w2(0xc);w2(4); | |
238 | } | |
239 | ||
240 | if (!epatc8) { | |
241 | WR(8,0x10); WR(0xc,0x14); WR(0xa,0x38); WR(0x12,0x10); | |
242 | } | |
243 | } | |
244 | ||
245 | static void epat_disconnect (PIA *pi) | |
246 | { CPP(0x30); | |
247 | w0(pi->saved_r0); | |
248 | w2(pi->saved_r2); | |
249 | } | |
250 | ||
251 | static int epat_test_proto( PIA *pi, char * scratch, int verbose ) | |
252 | ||
253 | { int k, j, f, cc; | |
254 | int e[2] = {0,0}; | |
255 | ||
256 | epat_connect(pi); | |
257 | cc = RR(0xd); | |
258 | epat_disconnect(pi); | |
259 | ||
260 | epat_connect(pi); | |
261 | for (j=0;j<2;j++) { | |
262 | WRi(6,0xa0+j*0x10); | |
263 | for (k=0;k<256;k++) { | |
264 | WRi(2,k^0xaa); | |
265 | WRi(3,k^0x55); | |
266 | if (RRi(2) != (k^0xaa)) e[j]++; | |
267 | } | |
268 | } | |
269 | epat_disconnect(pi); | |
270 | ||
271 | f = 0; | |
272 | epat_connect(pi); | |
273 | WR(0x13,1); WR(0x13,0); WR(0xa,0x11); | |
274 | epat_read_block(pi,scratch,512); | |
275 | ||
276 | for (k=0;k<256;k++) { | |
277 | if ((scratch[2*k] & 0xff) != k) f++; | |
278 | if ((scratch[2*k+1] & 0xff) != (0xff-k)) f++; | |
279 | } | |
280 | epat_disconnect(pi); | |
281 | ||
282 | if (verbose) { | |
283 | printk("%s: epat: port 0x%x, mode %d, ccr %x, test=(%d,%d,%d)\n", | |
284 | pi->device,pi->port,pi->mode,cc,e[0],e[1],f); | |
285 | } | |
286 | ||
287 | return (e[0] && e[1]) || f; | |
288 | } | |
289 | ||
290 | static void epat_log_adapter( PIA *pi, char * scratch, int verbose ) | |
291 | ||
292 | { int ver; | |
293 | char *mode_string[6] = | |
294 | {"4-bit","5/3","8-bit","EPP-8","EPP-16","EPP-32"}; | |
295 | ||
296 | epat_connect(pi); | |
297 | WR(0xa,0x38); /* read the version code */ | |
298 | ver = RR(0xb); | |
299 | epat_disconnect(pi); | |
300 | ||
301 | printk("%s: epat %s, Shuttle EPAT chip %x at 0x%x, ", | |
302 | pi->device,EPAT_VERSION,ver,pi->port); | |
303 | printk("mode %d (%s), delay %d\n",pi->mode, | |
304 | mode_string[pi->mode],pi->delay); | |
305 | ||
306 | } | |
307 | ||
308 | static struct pi_protocol epat = { | |
309 | .owner = THIS_MODULE, | |
310 | .name = "epat", | |
311 | .max_mode = 6, | |
312 | .epp_first = 3, | |
313 | .default_delay = 1, | |
314 | .max_units = 1, | |
315 | .write_regr = epat_write_regr, | |
316 | .read_regr = epat_read_regr, | |
317 | .write_block = epat_write_block, | |
318 | .read_block = epat_read_block, | |
319 | .connect = epat_connect, | |
320 | .disconnect = epat_disconnect, | |
321 | .test_proto = epat_test_proto, | |
322 | .log_adapter = epat_log_adapter, | |
323 | }; | |
324 | ||
325 | static int __init epat_init(void) | |
326 | { | |
327 | #ifdef CONFIG_PARIDE_EPATC8 | |
328 | epatc8 = 1; | |
329 | #endif | |
b4178ab5 | 330 | return paride_register(&epat); |
1da177e4 LT |
331 | } |
332 | ||
333 | static void __exit epat_exit(void) | |
334 | { | |
f4330002 | 335 | paride_unregister(&epat); |
1da177e4 LT |
336 | } |
337 | ||
338 | MODULE_LICENSE("GPL"); | |
339 | module_init(epat_init) | |
340 | module_exit(epat_exit) |