GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / block / paride / frpw.c
1 /* 
2         frpw.c  (c) 1996-8  Grant R. Guenther <grant@torque.net>
3                             Under the terms of the GNU General Public License
4
5         frpw.c is a low-level protocol driver for the Freecom "Power"
6         parallel port IDE adapter.
7         
8         Some applications of this adapter may require a "printer" reset
9         prior to loading the driver.  This can be done by loading and
10         unloading the "lp" driver, or it can be done by this driver
11         if you define FRPW_HARD_RESET.  The latter is not recommended
12         as it may upset devices on other ports.
13
14 */
15
16 /* Changes:
17
18         1.01    GRG 1998.05.06 init_proto, release_proto
19                                fix chip detect
20                                added EPP-16 and EPP-32
21         1.02    GRG 1998.09.23 added hard reset to initialisation process
22         1.03    GRG 1998.12.14 made hard reset conditional
23
24 */
25
26 #define FRPW_VERSION    "1.03" 
27
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/delay.h>
31 #include <linux/kernel.h>
32 #include <linux/types.h>
33 #include <linux/wait.h>
34 #include <asm/io.h>
35
36 #include "paride.h"
37
38 #define cec4            w2(0xc);w2(0xe);w2(0xe);w2(0xc);w2(4);w2(4);w2(4);
39 #define j44(l,h)        (((l>>4)&0x0f)|(h&0xf0))
40
41 /* cont = 0 - access the IDE register file 
42    cont = 1 - access the IDE command set 
43 */
44
45 static int  cont_map[2] = { 0x08, 0x10 };
46
47 static int frpw_read_regr( PIA *pi, int cont, int regr )
48
49 {       int     h,l,r;
50
51         r = regr + cont_map[cont];
52
53         w2(4);
54         w0(r); cec4;
55         w2(6); l = r1();
56         w2(4); h = r1();
57         w2(4); 
58
59         return j44(l,h);
60
61 }
62
63 static void frpw_write_regr( PIA *pi, int cont, int regr, int val)
64
65 {       int r;
66
67         r = regr + cont_map[cont];
68
69         w2(4); w0(r); cec4; 
70         w0(val);
71         w2(5);w2(7);w2(5);w2(4);
72 }
73
74 static void frpw_read_block_int( PIA *pi, char * buf, int count, int regr )
75
76 {       int     h, l, k, ph;
77
78         switch(pi->mode) {
79
80         case 0: w2(4); w0(regr); cec4;
81                 for (k=0;k<count;k++) {
82                         w2(6); l = r1();
83                         w2(4); h = r1();
84                         buf[k] = j44(l,h);
85                 }
86                 w2(4);
87                 break;
88
89         case 1: ph = 2;
90                 w2(4); w0(regr + 0xc0); cec4;
91                 w0(0xff);
92                 for (k=0;k<count;k++) {
93                         w2(0xa4 + ph); 
94                         buf[k] = r0();
95                         ph = 2 - ph;
96                 } 
97                 w2(0xac); w2(0xa4); w2(4);
98                 break;
99
100         case 2: w2(4); w0(regr + 0x80); cec4;
101                 for (k=0;k<count;k++) buf[k] = r4();
102                 w2(0xac); w2(0xa4);
103                 w2(4);
104                 break;
105
106         case 3: w2(4); w0(regr + 0x80); cec4;
107                 for (k=0;k<count-2;k++) buf[k] = r4();
108                 w2(0xac); w2(0xa4);
109                 buf[count-2] = r4();
110                 buf[count-1] = r4();
111                 w2(4);
112                 break;
113
114         case 4: w2(4); w0(regr + 0x80); cec4;
115                 for (k=0;k<(count/2)-1;k++) ((u16 *)buf)[k] = r4w();
116                 w2(0xac); w2(0xa4);
117                 buf[count-2] = r4();
118                 buf[count-1] = r4();
119                 w2(4);
120                 break;
121
122         case 5: w2(4); w0(regr + 0x80); cec4;
123                 for (k=0;k<(count/4)-1;k++) ((u32 *)buf)[k] = r4l();
124                 buf[count-4] = r4();
125                 buf[count-3] = r4();
126                 w2(0xac); w2(0xa4);
127                 buf[count-2] = r4();
128                 buf[count-1] = r4();
129                 w2(4);
130                 break;
131
132         }
133 }
134
135 static void frpw_read_block( PIA *pi, char * buf, int count)
136
137 {       frpw_read_block_int(pi,buf,count,0x08);
138 }
139
140 static void frpw_write_block( PIA *pi, char * buf, int count )
141  
142 {       int     k;
143
144         switch(pi->mode) {
145
146         case 0:
147         case 1:
148         case 2: w2(4); w0(8); cec4; w2(5);
149                 for (k=0;k<count;k++) {
150                         w0(buf[k]);
151                         w2(7);w2(5);
152                 }
153                 w2(4);
154                 break;
155
156         case 3: w2(4); w0(0xc8); cec4; w2(5);
157                 for (k=0;k<count;k++) w4(buf[k]);
158                 w2(4);
159                 break;
160
161         case 4: w2(4); w0(0xc8); cec4; w2(5);
162                 for (k=0;k<count/2;k++) w4w(((u16 *)buf)[k]);
163                 w2(4);
164                 break;
165
166         case 5: w2(4); w0(0xc8); cec4; w2(5);
167                 for (k=0;k<count/4;k++) w4l(((u32 *)buf)[k]);
168                 w2(4);
169                 break;
170         }
171 }
172
173 static void frpw_connect ( PIA *pi  )
174
175 {       pi->saved_r0 = r0();
176         pi->saved_r2 = r2();
177         w2(4);
178 }
179
180 static void frpw_disconnect ( PIA *pi )
181
182 {       w2(4); w0(0x20); cec4;
183         w0(pi->saved_r0);
184         w2(pi->saved_r2);
185
186
187 /* Stub logic to see if PNP string is available - used to distinguish
188    between the Xilinx and ASIC implementations of the Freecom adapter.
189 */
190
191 static int frpw_test_pnp ( PIA *pi )
192
193 /*  returns chip_type:   0 = Xilinx, 1 = ASIC   */
194
195 {       int olddelay, a, b;
196
197 #ifdef FRPW_HARD_RESET
198         w0(0); w2(8); udelay(50); w2(0xc);   /* parallel bus reset */
199         mdelay(1500);
200 #endif
201
202         olddelay = pi->delay;
203         pi->delay = 10;
204
205         pi->saved_r0 = r0();
206         pi->saved_r2 = r2();
207         
208         w2(4); w0(4); w2(6); w2(7);
209         a = r1() & 0xff; w2(4); b = r1() & 0xff;
210         w2(0xc); w2(0xe); w2(4);
211
212         pi->delay = olddelay;
213         w0(pi->saved_r0);
214         w2(pi->saved_r2);
215
216         return ((~a&0x40) && (b&0x40));
217
218
219 /* We use the pi->private to remember the result of the PNP test.
220    To make this work, private = port*2 + chip.  Yes, I know it's
221    a hack :-(
222 */
223
224 static int frpw_test_proto( PIA *pi, char * scratch, int verbose )
225
226 {       int     j, k, r;
227         int     e[2] = {0,0};
228
229         if ((pi->private>>1) != pi->port)
230            pi->private = frpw_test_pnp(pi) + 2*pi->port;
231
232         if (((pi->private%2) == 0) && (pi->mode > 2)) {
233            if (verbose) 
234                 printk("%s: frpw: Xilinx does not support mode %d\n",
235                         pi->device, pi->mode);
236            return 1;
237         }
238
239         if (((pi->private%2) == 1) && (pi->mode == 2)) {
240            if (verbose)
241                 printk("%s: frpw: ASIC does not support mode 2\n",
242                         pi->device);
243            return 1;
244         }
245
246         frpw_connect(pi);
247         for (j=0;j<2;j++) {
248                 frpw_write_regr(pi,0,6,0xa0+j*0x10);
249                 for (k=0;k<256;k++) {
250                         frpw_write_regr(pi,0,2,k^0xaa);
251                         frpw_write_regr(pi,0,3,k^0x55);
252                         if (frpw_read_regr(pi,0,2) != (k^0xaa)) e[j]++;
253                         }
254                 }
255         frpw_disconnect(pi);
256
257         frpw_connect(pi);
258         frpw_read_block_int(pi,scratch,512,0x10);
259         r = 0;
260         for (k=0;k<128;k++) if (scratch[k] != k) r++;
261         frpw_disconnect(pi);
262
263         if (verbose)  {
264             printk("%s: frpw: port 0x%x, chip %ld, mode %d, test=(%d,%d,%d)\n",
265                    pi->device,pi->port,(pi->private%2),pi->mode,e[0],e[1],r);
266         }
267
268         return (r || (e[0] && e[1]));
269 }
270
271
272 static void frpw_log_adapter( PIA *pi, char * scratch, int verbose )
273
274 {       char    *mode_string[6] = {"4-bit","8-bit","EPP",
275                                    "EPP-8","EPP-16","EPP-32"};
276
277         printk("%s: frpw %s, Freecom (%s) adapter at 0x%x, ", pi->device,
278                 FRPW_VERSION,((pi->private%2) == 0)?"Xilinx":"ASIC",pi->port);
279         printk("mode %d (%s), delay %d\n",pi->mode,
280                 mode_string[pi->mode],pi->delay);
281
282 }
283
284 static struct pi_protocol frpw = {
285         .owner          = THIS_MODULE,
286         .name           = "frpw",
287         .max_mode       = 6,
288         .epp_first      = 2,
289         .default_delay  = 2,
290         .max_units      = 1,
291         .write_regr     = frpw_write_regr,
292         .read_regr      = frpw_read_regr,
293         .write_block    = frpw_write_block,
294         .read_block     = frpw_read_block,
295         .connect        = frpw_connect,
296         .disconnect     = frpw_disconnect,
297         .test_proto     = frpw_test_proto,
298         .log_adapter    = frpw_log_adapter,
299 };
300
301 static int __init frpw_init(void)
302 {
303         return paride_register(&frpw);
304 }
305
306 static void __exit frpw_exit(void)
307 {
308         paride_unregister(&frpw);
309 }
310
311 MODULE_LICENSE("GPL");
312 module_init(frpw_init)
313 module_exit(frpw_exit)