File: /usr/src/linux/drivers/block/paride/on26.c
1 /*
2 on26.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
4
5 on26.c is a low-level protocol driver for the
6 OnSpec 90c26 parallel to IDE adapter chip.
7
8 */
9
10 /* Changes:
11
12 1.01 GRG 1998.05.06 init_proto, release_proto
13 1.02 GRG 1998.09.23 updates for the -E rev chip
14 1.03 GRG 1998.12.14 fix for slave drives
15 1.04 GRG 1998.12.20 yet another bug fix
16
17 */
18
19 #define ON26_VERSION "1.04"
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 /* mode codes: 0 nybble reads, 8-bit writes
31 1 8-bit reads and writes
32 2 8-bit EPP mode
33 3 EPP-16
34 4 EPP-32
35 */
36
37 #define j44(a,b) (((a>>4)&0x0f)|(b&0xf0))
38
39 #define P1 w2(5);w2(0xd);w2(5);w2(0xd);w2(5);w2(4);
40 #define P2 w2(5);w2(7);w2(5);w2(4);
41
42 /* cont = 0 - access the IDE register file
43 cont = 1 - access the IDE command set
44 */
45
46 static int on26_read_regr( PIA *pi, int cont, int regr )
47
48 { int a, b, r;
49
50 r = (regr<<2) + 1 + cont;
51
52 switch (pi->mode) {
53
54 case 0: w0(1); P1; w0(r); P2; w0(0); P1;
55 w2(6); a = r1(); w2(4);
56 w2(6); b = r1(); w2(4);
57 w2(6); w2(4); w2(6); w2(4);
58 return j44(a,b);
59
60 case 1: w0(1); P1; w0(r); P2; w0(0); P1;
61 w2(0x26); a = r0(); w2(4); w2(0x26); w2(4);
62 return a;
63
64 case 2:
65 case 3:
66 case 4: w3(1); w3(1); w2(5); w4(r); w2(4);
67 w3(0); w3(0); w2(0x24); a = r4(); w2(4);
68 w2(0x24); r4(); w2(4);
69 return a;
70
71 }
72 return -1;
73 }
74
75 static void on26_write_regr( PIA *pi, int cont, int regr, int val )
76
77 { int r;
78
79 r = (regr<<2) + 1 + cont;
80
81 switch (pi->mode) {
82
83 case 0:
84 case 1: w0(1); P1; w0(r); P2; w0(0); P1;
85 w0(val); P2; w0(val); P2;
86 break;
87
88 case 2:
89 case 3:
90 case 4: w3(1); w3(1); w2(5); w4(r); w2(4);
91 w3(0); w3(0);
92 w2(5); w4(val); w2(4);
93 w2(5); w4(val); w2(4);
94 break;
95 }
96 }
97
98 #define CCP(x) w0(0xfe);w0(0xaa);w0(0x55);w0(0);w0(0xff);\
99 w0(0x87);w0(0x78);w0(x);w2(4);w2(5);w2(4);w0(0xff);
100
101 static void on26_connect ( PIA *pi )
102
103 { int x;
104
105 pi->saved_r0 = r0();
106 pi->saved_r2 = r2();
107
108 CCP(0x20);
109 x = 8; if (pi->mode) x = 9;
110
111 w0(2); P1; w0(8); P2;
112 w0(2); P1; w0(x); P2;
113 }
114
115 static void on26_disconnect ( PIA *pi )
116
117 { if (pi->mode >= 2) { w3(4); w3(4); w3(4); w3(4); }
118 else { w0(4); P1; w0(4); P1; }
119 CCP(0x30);
120 w0(pi->saved_r0);
121 w2(pi->saved_r2);
122 }
123
124 #define RESET_WAIT 200
125
126 static int on26_test_port( PIA *pi) /* hard reset */
127
128 { int i, m, d, x=0, y=0;
129
130 pi->saved_r0 = r0();
131 pi->saved_r2 = r2();
132
133 d = pi->delay;
134 m = pi->mode;
135 pi->delay = 5;
136 pi->mode = 0;
137
138 w2(0xc);
139
140 CCP(0x30); CCP(0);
141
142 w0(0xfe);w0(0xaa);w0(0x55);w0(0);w0(0xff);
143 i = ((r1() & 0xf0) << 4); w0(0x87);
144 i |= (r1() & 0xf0); w0(0x78);
145 w0(0x20);w2(4);w2(5);
146 i |= ((r1() & 0xf0) >> 4);
147 w2(4);w0(0xff);
148
149 if (i == 0xb5f) {
150
151 w0(2); P1; w0(0); P2;
152 w0(3); P1; w0(0); P2;
153 w0(2); P1; w0(8); P2; udelay(100);
154 w0(2); P1; w0(0xa); P2; udelay(100);
155 w0(2); P1; w0(8); P2; udelay(1000);
156
157 on26_write_regr(pi,0,6,0xa0);
158
159 for (i=0;i<RESET_WAIT;i++) {
160 on26_write_regr(pi,0,6,0xa0);
161 x = on26_read_regr(pi,0,7);
162 on26_write_regr(pi,0,6,0xb0);
163 y = on26_read_regr(pi,0,7);
164 if (!((x&0x80)||(y&0x80))) break;
165 mdelay(100);
166 }
167
168 if (i == RESET_WAIT)
169 printk("on26: Device reset failed (%x,%x)\n",x,y);
170
171 w0(4); P1; w0(4); P1;
172 }
173
174 CCP(0x30);
175
176 pi->delay = d;
177 pi->mode = m;
178 w0(pi->saved_r0);
179 w2(pi->saved_r2);
180
181 return 5;
182 }
183
184
185 static void on26_read_block( PIA *pi, char * buf, int count )
186
187 { int k, a, b;
188
189 switch (pi->mode) {
190
191 case 0: w0(1); P1; w0(1); P2; w0(2); P1; w0(0x18); P2; w0(0); P1;
192 udelay(10);
193 for (k=0;k<count;k++) {
194 w2(6); a = r1();
195 w2(4); b = r1();
196 buf[k] = j44(a,b);
197 }
198 w0(2); P1; w0(8); P2;
199 break;
200
201 case 1: w0(1); P1; w0(1); P2; w0(2); P1; w0(0x19); P2; w0(0); P1;
202 udelay(10);
203 for (k=0;k<count/2;k++) {
204 w2(0x26); buf[2*k] = r0();
205 w2(0x24); buf[2*k+1] = r0();
206 }
207 w0(2); P1; w0(9); P2;
208 break;
209
210 case 2: w3(1); w3(1); w2(5); w4(1); w2(4);
211 w3(0); w3(0); w2(0x24);
212 udelay(10);
213 for (k=0;k<count;k++) buf[k] = r4();
214 w2(4);
215 break;
216
217 case 3: w3(1); w3(1); w2(5); w4(1); w2(4);
218 w3(0); w3(0); w2(0x24);
219 udelay(10);
220 for (k=0;k<count/2;k++) ((u16 *)buf)[k] = r4w();
221 w2(4);
222 break;
223
224 case 4: w3(1); w3(1); w2(5); w4(1); w2(4);
225 w3(0); w3(0); w2(0x24);
226 udelay(10);
227 for (k=0;k<count/4;k++) ((u32 *)buf)[k] = r4l();
228 w2(4);
229 break;
230
231 }
232 }
233
234 static void on26_write_block( PIA *pi, char * buf, int count )
235
236 { int k;
237
238 switch (pi->mode) {
239
240 case 0:
241 case 1: w0(1); P1; w0(1); P2;
242 w0(2); P1; w0(0x18+pi->mode); P2; w0(0); P1;
243 udelay(10);
244 for (k=0;k<count/2;k++) {
245 w2(5); w0(buf[2*k]);
246 w2(7); w0(buf[2*k+1]);
247 }
248 w2(5); w2(4);
249 w0(2); P1; w0(8+pi->mode); P2;
250 break;
251
252 case 2: w3(1); w3(1); w2(5); w4(1); w2(4);
253 w3(0); w3(0); w2(0xc5);
254 udelay(10);
255 for (k=0;k<count;k++) w4(buf[k]);
256 w2(0xc4);
257 break;
258
259 case 3: w3(1); w3(1); w2(5); w4(1); w2(4);
260 w3(0); w3(0); w2(0xc5);
261 udelay(10);
262 for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
263 w2(0xc4);
264 break;
265
266 case 4: w3(1); w3(1); w2(5); w4(1); w2(4);
267 w3(0); w3(0); w2(0xc5);
268 udelay(10);
269 for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
270 w2(0xc4);
271 break;
272
273 }
274
275 }
276
277 static void on26_log_adapter( PIA *pi, char * scratch, int verbose )
278
279 { char *mode_string[5] = {"4-bit","8-bit","EPP-8",
280 "EPP-16","EPP-32"};
281
282 printk("%s: on26 %s, OnSpec 90c26 at 0x%x, ",
283 pi->device,ON26_VERSION,pi->port);
284 printk("mode %d (%s), delay %d\n",pi->mode,
285 mode_string[pi->mode],pi->delay);
286
287 }
288
289 static void on26_init_proto( PIA *pi)
290
291 { MOD_INC_USE_COUNT;
292 }
293
294 static void on26_release_proto( PIA *pi)
295
296 { MOD_DEC_USE_COUNT;
297 }
298
299 struct pi_protocol on26 = {"on26",0,5,2,1,1,
300 on26_write_regr,
301 on26_read_regr,
302 on26_write_block,
303 on26_read_block,
304 on26_connect,
305 on26_disconnect,
306 on26_test_port,
307 0,
308 0,
309 on26_log_adapter,
310 on26_init_proto,
311 on26_release_proto
312 };
313
314
315 #ifdef MODULE
316
317 int init_module(void)
318
319 { return pi_register( &on26 ) - 1;
320 }
321
322 void cleanup_module(void)
323
324 { pi_unregister( &on26 );
325 }
326
327 #endif
328
329 /* end of on26.c */
330
331